diff options
Diffstat (limited to 'src/nspawn')
| -rw-r--r-- | src/nspawn/nspawn-cgroup.c | 162 | ||||
| -rw-r--r-- | src/nspawn/nspawn-cgroup.h | 29 | ||||
| -rw-r--r-- | src/nspawn/nspawn-expose-ports.c | 277 | ||||
| -rw-r--r-- | src/nspawn/nspawn-expose-ports.h | 45 | ||||
| -rw-r--r-- | src/nspawn/nspawn-gperf.gperf | 2 | ||||
| -rw-r--r-- | src/nspawn/nspawn-mount.c | 869 | ||||
| -rw-r--r-- | src/nspawn/nspawn-mount.h (renamed from src/nspawn/nspawn.h) | 23 | ||||
| -rw-r--r-- | src/nspawn/nspawn-network.c | 440 | ||||
| -rw-r--r-- | src/nspawn/nspawn-network.h | 36 | ||||
| -rw-r--r-- | src/nspawn/nspawn-register.c | 244 | ||||
| -rw-r--r-- | src/nspawn/nspawn-register.h | 31 | ||||
| -rw-r--r-- | src/nspawn/nspawn-settings.c | 1 | ||||
| -rw-r--r-- | src/nspawn/nspawn-settings.h | 4 | ||||
| -rw-r--r-- | src/nspawn/nspawn-setuid.c | 272 | ||||
| -rw-r--r-- | src/nspawn/nspawn-setuid.h | 24 | ||||
| -rw-r--r-- | src/nspawn/nspawn.c | 2293 |
16 files changed, 2575 insertions, 2177 deletions
diff --git a/src/nspawn/nspawn-cgroup.c b/src/nspawn/nspawn-cgroup.c new file mode 100644 index 0000000000..c0e9ccd7a4 --- /dev/null +++ b/src/nspawn/nspawn-cgroup.c @@ -0,0 +1,162 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/mount.h> + +#include "util.h" +#include "strv.h" +#include "mkdir.h" +#include "fileio.h" +#include "cgroup-util.h" + +#include "nspawn-cgroup.h" + +int chown_cgroup(pid_t pid, uid_t uid_shift) { + _cleanup_free_ char *path = NULL, *fs = NULL; + _cleanup_close_ int fd = -1; + const char *fn; + int r; + + r = cg_pid_get_path(NULL, pid, &path); + if (r < 0) + return log_error_errno(r, "Failed to get container cgroup path: %m"); + + r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); + if (r < 0) + return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); + + fd = open(fs, O_RDONLY|O_CLOEXEC|O_DIRECTORY); + if (fd < 0) + return log_error_errno(errno, "Failed to open %s: %m", fs); + + FOREACH_STRING(fn, + ".", + "tasks", + "notify_on_release", + "cgroup.procs", + "cgroup.clone_children", + "cgroup.controllers", + "cgroup.subtree_control", + "cgroup.populated") + if (fchownat(fd, fn, uid_shift, uid_shift, 0) < 0) + log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, + "Failed to chown() cgroup file %s, ignoring: %m", fn); + + return 0; +} + +int sync_cgroup(pid_t pid, bool unified_requested) { + _cleanup_free_ char *cgroup = NULL; + char tree[] = "/tmp/unifiedXXXXXX", pid_string[DECIMAL_STR_MAX(pid) + 1]; + bool undo_mount = false; + const char *fn; + int unified, r; + + unified = cg_unified(); + if (unified < 0) + return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m"); + + if ((unified > 0) == unified_requested) + return 0; + + /* When the host uses the legacy cgroup setup, but the + * container shall use the unified hierarchy, let's make sure + * we copy the path from the name=systemd hierarchy into the + * unified hierarchy. Similar for the reverse situation. */ + + r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); + if (r < 0) + return log_error_errno(r, "Failed to get control group of " PID_FMT ": %m", pid); + + /* In order to access the unified hierarchy we need to mount it */ + if (!mkdtemp(tree)) + return log_error_errno(errno, "Failed to generate temporary mount point for unified hierarchy: %m"); + + if (unified) + r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "none,name=systemd,xattr"); + else + r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior"); + if (r < 0) { + r = log_error_errno(errno, "Failed to mount unified hierarchy: %m"); + goto finish; + } + + undo_mount = true; + + fn = strjoina(tree, cgroup, "/cgroup.procs"); + (void) mkdir_parents(fn, 0755); + + sprintf(pid_string, PID_FMT, pid); + r = write_string_file(fn, pid_string, 0); + if (r < 0) + log_error_errno(r, "Failed to move process: %m"); + +finish: + if (undo_mount) + (void) umount(tree); + + (void) rmdir(tree); + return r; +} + +int create_subcgroup(pid_t pid, bool unified_requested) { + _cleanup_free_ char *cgroup = NULL; + const char *child; + int unified, r; + CGroupMask supported; + + /* In the unified hierarchy inner nodes may only only contain + * subgroups, but not processes. Hence, if we running in the + * unified hierarchy and the container does the same, and we + * did not create a scope unit for the container move us and + * the container into two separate subcgroups. */ + + if (!unified_requested) + return 0; + + unified = cg_unified(); + if (unified < 0) + return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m"); + if (unified == 0) + return 0; + + r = cg_mask_supported(&supported); + if (r < 0) + return log_error_errno(r, "Failed to determine supported controllers: %m"); + + r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); + if (r < 0) + return log_error_errno(r, "Failed to get our control group: %m"); + + child = strjoina(cgroup, "/payload"); + r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, pid); + if (r < 0) + return log_error_errno(r, "Failed to create %s subcgroup: %m", child); + + child = strjoina(cgroup, "/supervisor"); + r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, 0); + if (r < 0) + return log_error_errno(r, "Failed to create %s subcgroup: %m", child); + + /* Try to enable as many controllers as possible for the new payload. */ + (void) cg_enable_everywhere(supported, supported, cgroup); + return 0; +} diff --git a/src/nspawn/nspawn-cgroup.h b/src/nspawn/nspawn-cgroup.h new file mode 100644 index 0000000000..985fdfaad5 --- /dev/null +++ b/src/nspawn/nspawn-cgroup.h @@ -0,0 +1,29 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/types.h> +#include <stdbool.h> + +int chown_cgroup(pid_t pid, uid_t uid_shift); +int sync_cgroup(pid_t pid, bool unified_requested); +int create_subcgroup(pid_t pid, bool unified_requested); diff --git a/src/nspawn/nspawn-expose-ports.c b/src/nspawn/nspawn-expose-ports.c new file mode 100644 index 0000000000..38250b6e02 --- /dev/null +++ b/src/nspawn/nspawn-expose-ports.c @@ -0,0 +1,277 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include "sd-netlink.h" + +#include "util.h" +#include "in-addr-util.h" +#include "firewall-util.h" +#include "local-addresses.h" +#include "netlink-util.h" + +#include "nspawn-expose-ports.h" + +int expose_port_parse(ExposePort **l, const char *s) { + + const char *split, *e; + uint16_t container_port, host_port; + int protocol; + ExposePort *p; + int r; + + assert(l); + assert(s); + + if ((e = startswith(s, "tcp:"))) + protocol = IPPROTO_TCP; + else if ((e = startswith(s, "udp:"))) + protocol = IPPROTO_UDP; + else { + e = s; + protocol = IPPROTO_TCP; + } + + split = strchr(e, ':'); + if (split) { + char v[split - e + 1]; + + memcpy(v, e, split - e); + v[split - e] = 0; + + r = safe_atou16(v, &host_port); + if (r < 0 || host_port <= 0) + return -EINVAL; + + r = safe_atou16(split + 1, &container_port); + } else { + r = safe_atou16(e, &container_port); + host_port = container_port; + } + + if (r < 0 || container_port <= 0) + return -EINVAL; + + LIST_FOREACH(ports, p, *l) + if (p->protocol == protocol && p->host_port == host_port) + return -EEXIST; + + p = new(ExposePort, 1); + if (!p) + return -ENOMEM; + + p->protocol = protocol; + p->host_port = host_port; + p->container_port = container_port; + + LIST_PREPEND(ports, *l, p); + + return 0; +} + +void expose_port_free_all(ExposePort *p) { + + while (p) { + ExposePort *q = p; + LIST_REMOVE(ports, p, q); + free(q); + } +} + +int expose_port_flush(ExposePort* l, union in_addr_union *exposed) { + ExposePort *p; + int r, af = AF_INET; + + assert(exposed); + + if (!l) + return 0; + + if (in_addr_is_null(af, exposed)) + return 0; + + log_debug("Lost IP address."); + + LIST_FOREACH(ports, p, l) { + r = fw_add_local_dnat(false, + af, + p->protocol, + NULL, + NULL, 0, + NULL, 0, + p->host_port, + exposed, + p->container_port, + NULL); + if (r < 0) + log_warning_errno(r, "Failed to modify firewall: %m"); + } + + *exposed = IN_ADDR_NULL; + return 0; +} + +int expose_port_execute(sd_netlink *rtnl, ExposePort *l, union in_addr_union *exposed) { + _cleanup_free_ struct local_address *addresses = NULL; + _cleanup_free_ char *pretty = NULL; + union in_addr_union new_exposed; + ExposePort *p; + bool add; + int af = AF_INET, r; + + assert(exposed); + + /* Invoked each time an address is added or removed inside the + * container */ + + if (!l) + return 0; + + r = local_addresses(rtnl, 0, af, &addresses); + if (r < 0) + return log_error_errno(r, "Failed to enumerate local addresses: %m"); + + add = r > 0 && + addresses[0].family == af && + addresses[0].scope < RT_SCOPE_LINK; + + if (!add) + return expose_port_flush(l, exposed); + + new_exposed = addresses[0].address; + if (in_addr_equal(af, exposed, &new_exposed)) + return 0; + + in_addr_to_string(af, &new_exposed, &pretty); + log_debug("New container IP is %s.", strna(pretty)); + + LIST_FOREACH(ports, p, l) { + + r = fw_add_local_dnat(true, + af, + p->protocol, + NULL, + NULL, 0, + NULL, 0, + p->host_port, + &new_exposed, + p->container_port, + in_addr_is_null(af, exposed) ? NULL : exposed); + if (r < 0) + log_warning_errno(r, "Failed to modify firewall: %m"); + } + + *exposed = new_exposed; + return 0; +} + +int expose_port_send_rtnl(int send_fd) { + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + struct msghdr mh = { + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + struct cmsghdr *cmsg; + _cleanup_close_ int fd = -1; + ssize_t k; + + assert(send_fd >= 0); + + fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE); + if (fd < 0) + return log_error_errno(errno, "Failed to allocate container netlink: %m"); + + cmsg = CMSG_FIRSTHDR(&mh); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); + + mh.msg_controllen = cmsg->cmsg_len; + + /* Store away the fd in the socket, so that it stays open as + * long as we run the child */ + k = sendmsg(send_fd, &mh, MSG_NOSIGNAL); + if (k < 0) + return log_error_errno(errno, "Failed to send netlink fd: %m"); + + return 0; +} + +int expose_port_watch_rtnl( + sd_event *event, + int recv_fd, + sd_netlink_message_handler_t handler, + union in_addr_union *exposed, + sd_netlink **ret) { + + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + struct msghdr mh = { + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + struct cmsghdr *cmsg; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + int fd, r; + ssize_t k; + + assert(event); + assert(recv_fd >= 0); + assert(ret); + + k = recvmsg(recv_fd, &mh, MSG_NOSIGNAL); + if (k < 0) + return log_error_errno(errno, "Failed to recv netlink fd: %m"); + + cmsg = CMSG_FIRSTHDR(&mh); + assert(cmsg->cmsg_level == SOL_SOCKET); + assert(cmsg->cmsg_type == SCM_RIGHTS); + assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int))); + memcpy(&fd, CMSG_DATA(cmsg), sizeof(int)); + + r = sd_netlink_open_fd(&rtnl, fd); + if (r < 0) { + safe_close(fd); + return log_error_errno(r, "Failed to create rtnl object: %m"); + } + + r = sd_netlink_add_match(rtnl, RTM_NEWADDR, handler, exposed); + if (r < 0) + return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m"); + + r = sd_netlink_add_match(rtnl, RTM_DELADDR, handler, exposed); + if (r < 0) + return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m"); + + r = sd_netlink_attach_event(rtnl, event, 0); + if (r < 0) + return log_error_errno(r, "Failed to add to even loop: %m"); + + *ret = rtnl; + rtnl = NULL; + + return 0; +} diff --git a/src/nspawn/nspawn-expose-ports.h b/src/nspawn/nspawn-expose-ports.h new file mode 100644 index 0000000000..39cec28695 --- /dev/null +++ b/src/nspawn/nspawn-expose-ports.h @@ -0,0 +1,45 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <inttypes.h> + +#include "sd-event.h" +#include "sd-netlink.h" +#include "list.h" +#include "in-addr-util.h" + +typedef struct ExposePort { + int protocol; + uint16_t host_port; + uint16_t container_port; + LIST_FIELDS(struct ExposePort, ports); +} ExposePort; + +void expose_port_free_all(ExposePort *p); +int expose_port_parse(ExposePort **l, const char *s); + +int expose_port_watch_rtnl(sd_event *event, int recv_fd, sd_netlink_message_handler_t handler, union in_addr_union *exposed, sd_netlink **ret); +int expose_port_send_rtnl(int send_fd); + +int expose_port_execute(sd_netlink *rtnl, ExposePort *l, union in_addr_union *exposed); +int expose_port_flush(ExposePort* l, union in_addr_union *exposed); diff --git a/src/nspawn/nspawn-gperf.gperf b/src/nspawn/nspawn-gperf.gperf index 8b68dfa9f5..074b380306 100644 --- a/src/nspawn/nspawn-gperf.gperf +++ b/src/nspawn/nspawn-gperf.gperf @@ -1,8 +1,8 @@ %{ #include <stddef.h> #include "conf-parser.h" -#include "nspawn.h" #include "nspawn-settings.h" +#include "nspawn-expose-ports.h" %} struct ConfigPerfItem; %null_strings diff --git a/src/nspawn/nspawn-mount.c b/src/nspawn/nspawn-mount.c new file mode 100644 index 0000000000..2bca39f45d --- /dev/null +++ b/src/nspawn/nspawn-mount.c @@ -0,0 +1,869 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/mount.h> + +#include "util.h" +#include "rm-rf.h" +#include "strv.h" +#include "path-util.h" +#include "mkdir.h" +#include "label.h" +#include "set.h" +#include "cgroup-util.h" + +#include "nspawn-mount.h" + +CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t) { + CustomMount *c, *ret; + + assert(l); + assert(n); + assert(t >= 0); + assert(t < _CUSTOM_MOUNT_TYPE_MAX); + + c = realloc(*l, (*n + 1) * sizeof(CustomMount)); + if (!c) + return NULL; + + *l = c; + ret = *l + *n; + (*n)++; + + *ret = (CustomMount) { .type = t }; + + return ret; +} + +void custom_mount_free_all(CustomMount *l, unsigned n) { + unsigned i; + + for (i = 0; i < n; i++) { + CustomMount *m = l + i; + + free(m->source); + free(m->destination); + free(m->options); + + if (m->work_dir) { + (void) rm_rf(m->work_dir, REMOVE_ROOT|REMOVE_PHYSICAL); + free(m->work_dir); + } + + strv_free(m->lower); + } + + free(l); +} + +int custom_mount_compare(const void *a, const void *b) { + const CustomMount *x = a, *y = b; + int r; + + r = path_compare(x->destination, y->destination); + if (r != 0) + return r; + + if (x->type < y->type) + return -1; + if (x->type > y->type) + return 1; + + return 0; +} + +int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only) { + _cleanup_free_ char *source = NULL, *destination = NULL, *opts = NULL; + const char *p = s; + CustomMount *m; + int r; + + assert(l); + assert(n); + + r = extract_many_words(&p, ":", EXTRACT_DONT_COALESCE_SEPARATORS, &source, &destination, NULL); + if (r < 0) + return r; + if (r == 0) + return -EINVAL; + + if (r == 1) { + destination = strdup(source); + if (!destination) + return -ENOMEM; + } + + if (r == 2 && !isempty(p)) { + opts = strdup(p); + if (!opts) + return -ENOMEM; + } + + if (!path_is_absolute(source)) + return -EINVAL; + + if (!path_is_absolute(destination)) + return -EINVAL; + + m = custom_mount_add(l, n, CUSTOM_MOUNT_BIND); + if (!m) + return log_oom(); + + m->source = source; + m->destination = destination; + m->read_only = read_only; + m->options = opts; + + source = destination = opts = NULL; + return 0; +} + +int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s) { + _cleanup_free_ char *path = NULL, *opts = NULL; + const char *p = s; + CustomMount *m; + int r; + + assert(l); + assert(n); + assert(s); + + r = extract_first_word(&p, &path, ":", EXTRACT_DONT_COALESCE_SEPARATORS); + if (r < 0) + return r; + if (r == 0) + return -EINVAL; + + if (isempty(p)) + opts = strdup("mode=0755"); + else + opts = strdup(p); + if (!opts) + return -ENOMEM; + + if (!path_is_absolute(path)) + return -EINVAL; + + m = custom_mount_add(l, n, CUSTOM_MOUNT_TMPFS); + if (!m) + return -ENOMEM; + + m->destination = path; + m->options = opts; + + path = opts = NULL; + return 0; +} + +static int tmpfs_patch_options( + const char *options, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context, + char **ret) { + + char *buf = NULL; + + if (userns && uid_shift != 0) { + assert(uid_shift != UID_INVALID); + + if (options) + (void) asprintf(&buf, "%s,uid=" UID_FMT ",gid=" UID_FMT, options, uid_shift, uid_shift); + else + (void) asprintf(&buf, "uid=" UID_FMT ",gid=" UID_FMT, uid_shift, uid_shift); + if (!buf) + return -ENOMEM; + + options = buf; + } + +#ifdef HAVE_SELINUX + if (selinux_apifs_context) { + char *t; + + if (options) + t = strjoin(options, ",context=\"", selinux_apifs_context, "\"", NULL); + else + t = strjoin("context=\"", selinux_apifs_context, "\"", NULL); + if (!t) { + free(buf); + return -ENOMEM; + } + + free(buf); + buf = t; + } +#endif + + *ret = buf; + return !!buf; +} + +int mount_all(const char *dest, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + typedef struct MountPoint { + const char *what; + const char *where; + const char *type; + const char *options; + unsigned long flags; + bool fatal; + bool userns; + } MountPoint; + + static const MountPoint mount_table[] = { + { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true }, + { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */ + { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */ + { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false }, + { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false }, + { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false }, + { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false }, + { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false }, +#ifdef HAVE_SELINUX + { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, false }, /* Bind mount first */ + { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, false }, /* Then, make it r/o */ +#endif + }; + + unsigned k; + int r; + + for (k = 0; k < ELEMENTSOF(mount_table); k++) { + _cleanup_free_ char *where = NULL, *options = NULL; + const char *o; + + if (userns != mount_table[k].userns) + continue; + + where = prefix_root(dest, mount_table[k].where); + if (!where) + return log_oom(); + + r = path_is_mount_point(where, AT_SYMLINK_FOLLOW); + if (r < 0 && r != -ENOENT) + return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where); + + /* Skip this entry if it is not a remount. */ + if (mount_table[k].what && r > 0) + continue; + + r = mkdir_p(where, 0755); + if (r < 0) { + if (mount_table[k].fatal) + return log_error_errno(r, "Failed to create directory %s: %m", where); + + log_warning_errno(r, "Failed to create directory %s: %m", where); + continue; + } + + o = mount_table[k].options; + if (streq_ptr(mount_table[k].type, "tmpfs")) { + r = tmpfs_patch_options(o, userns, uid_shift, uid_range, selinux_apifs_context, &options); + if (r < 0) + return log_oom(); + if (r > 0) + o = options; + } + + if (mount(mount_table[k].what, + where, + mount_table[k].type, + mount_table[k].flags, + o) < 0) { + + if (mount_table[k].fatal) + return log_error_errno(errno, "mount(%s) failed: %m", where); + + log_warning_errno(errno, "mount(%s) failed, ignoring: %m", where); + } + } + + return 0; +} + +static int parse_mount_bind_options(const char *options, unsigned long *mount_flags, char **mount_opts) { + const char *p = options; + unsigned long flags = *mount_flags; + char *opts = NULL; + + assert(options); + + for (;;) { + _cleanup_free_ char *word = NULL; + int r = extract_first_word(&p, &word, ",", 0); + if (r < 0) + return log_error_errno(r, "Failed to extract mount option: %m"); + if (r == 0) + break; + + if (streq(word, "rbind")) + flags |= MS_REC; + else if (streq(word, "norbind")) + flags &= ~MS_REC; + else { + log_error("Invalid bind mount option: %s", word); + return -EINVAL; + } + } + + *mount_flags = flags; + /* in the future mount_opts will hold string options for mount(2) */ + *mount_opts = opts; + + return 0; +} + +static int mount_bind(const char *dest, CustomMount *m) { + struct stat source_st, dest_st; + const char *where; + unsigned long mount_flags = MS_BIND | MS_REC; + _cleanup_free_ char *mount_opts = NULL; + int r; + + assert(m); + + if (m->options) { + r = parse_mount_bind_options(m->options, &mount_flags, &mount_opts); + if (r < 0) + return r; + } + + if (stat(m->source, &source_st) < 0) + return log_error_errno(errno, "Failed to stat %s: %m", m->source); + + where = prefix_roota(dest, m->destination); + + if (stat(where, &dest_st) >= 0) { + if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) { + log_error("Cannot bind mount directory %s on file %s.", m->source, where); + return -EINVAL; + } + + if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) { + log_error("Cannot bind mount file %s on directory %s.", m->source, where); + return -EINVAL; + } + + } else if (errno == ENOENT) { + r = mkdir_parents_label(where, 0755); + if (r < 0) + return log_error_errno(r, "Failed to make parents of %s: %m", where); + } else { + log_error_errno(errno, "Failed to stat %s: %m", where); + return -errno; + } + + /* Create the mount point. Any non-directory file can be + * mounted on any non-directory file (regular, fifo, socket, + * char, block). + */ + if (S_ISDIR(source_st.st_mode)) + r = mkdir_label(where, 0755); + else + r = touch(where); + if (r < 0 && r != -EEXIST) + return log_error_errno(r, "Failed to create mount point %s: %m", where); + + if (mount(m->source, where, NULL, mount_flags, mount_opts) < 0) + return log_error_errno(errno, "mount(%s) failed: %m", where); + + if (m->read_only) { + r = bind_remount_recursive(where, true); + if (r < 0) + return log_error_errno(r, "Read-only bind mount failed: %m"); + } + + return 0; +} + +static int mount_tmpfs( + const char *dest, + CustomMount *m, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + const char *where, *options; + _cleanup_free_ char *buf = NULL; + int r; + + assert(dest); + assert(m); + + where = prefix_roota(dest, m->destination); + + r = mkdir_p_label(where, 0755); + if (r < 0 && r != -EEXIST) + return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where); + + r = tmpfs_patch_options(m->options, userns, uid_shift, uid_range, selinux_apifs_context, &buf); + if (r < 0) + return log_oom(); + options = r > 0 ? buf : m->options; + + if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options) < 0) + return log_error_errno(errno, "tmpfs mount to %s failed: %m", where); + + return 0; +} + +static char *joined_and_escaped_lower_dirs(char * const *lower) { + _cleanup_strv_free_ char **sv = NULL; + + sv = strv_copy(lower); + if (!sv) + return NULL; + + strv_reverse(sv); + + if (!strv_shell_escape(sv, ",:")) + return NULL; + + return strv_join(sv, ":"); +} + +static int mount_overlay(const char *dest, CustomMount *m) { + _cleanup_free_ char *lower = NULL; + const char *where, *options; + int r; + + assert(dest); + assert(m); + + where = prefix_roota(dest, m->destination); + + r = mkdir_label(where, 0755); + if (r < 0 && r != -EEXIST) + return log_error_errno(r, "Creating mount point for overlay %s failed: %m", where); + + (void) mkdir_p_label(m->source, 0755); + + lower = joined_and_escaped_lower_dirs(m->lower); + if (!lower) + return log_oom(); + + if (m->read_only) { + _cleanup_free_ char *escaped_source = NULL; + + escaped_source = shell_escape(m->source, ",:"); + if (!escaped_source) + return log_oom(); + + options = strjoina("lowerdir=", escaped_source, ":", lower); + } else { + _cleanup_free_ char *escaped_source = NULL, *escaped_work_dir = NULL; + + assert(m->work_dir); + (void) mkdir_label(m->work_dir, 0700); + + escaped_source = shell_escape(m->source, ",:"); + if (!escaped_source) + return log_oom(); + escaped_work_dir = shell_escape(m->work_dir, ",:"); + if (!escaped_work_dir) + return log_oom(); + + options = strjoina("lowerdir=", lower, ",upperdir=", escaped_source, ",workdir=", escaped_work_dir); + } + + if (mount("overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options) < 0) + return log_error_errno(errno, "overlay mount to %s failed: %m", where); + + return 0; +} + +int mount_custom( + const char *dest, + CustomMount *mounts, unsigned n, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + unsigned i; + int r; + + assert(dest); + + for (i = 0; i < n; i++) { + CustomMount *m = mounts + i; + + switch (m->type) { + + case CUSTOM_MOUNT_BIND: + r = mount_bind(dest, m); + break; + + case CUSTOM_MOUNT_TMPFS: + r = mount_tmpfs(dest, m, userns, uid_shift, uid_range, selinux_apifs_context); + break; + + case CUSTOM_MOUNT_OVERLAY: + r = mount_overlay(dest, m); + break; + + default: + assert_not_reached("Unknown custom mount type"); + } + + if (r < 0) + return r; + } + + return 0; +} + +static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) { + char *to; + int r; + + to = strjoina(dest, "/sys/fs/cgroup/", hierarchy); + + r = path_is_mount_point(to, 0); + if (r < 0 && r != -ENOENT) + return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to); + if (r > 0) + return 0; + + mkdir_p(to, 0755); + + /* The superblock mount options of the mount point need to be + * identical to the hosts', and hence writable... */ + if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0) + return log_error_errno(errno, "Failed to mount to %s: %m", to); + + /* ... hence let's only make the bind mount read-only, not the + * superblock. */ + if (read_only) { + if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0) + return log_error_errno(errno, "Failed to remount %s read-only: %m", to); + } + return 1; +} + +static int mount_legacy_cgroups( + const char *dest, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + _cleanup_set_free_free_ Set *controllers = NULL; + const char *cgroup_root; + int r; + + cgroup_root = prefix_roota(dest, "/sys/fs/cgroup"); + + /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */ + r = path_is_mount_point(cgroup_root, AT_SYMLINK_FOLLOW); + if (r < 0) + return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m"); + if (r == 0) { + _cleanup_free_ char *options = NULL; + + r = tmpfs_patch_options("mode=755", userns, uid_shift, uid_range, selinux_apifs_context, &options); + if (r < 0) + return log_oom(); + + if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options) < 0) + return log_error_errno(errno, "Failed to mount /sys/fs/cgroup: %m"); + } + + if (cg_unified() > 0) + goto skip_controllers; + + controllers = set_new(&string_hash_ops); + if (!controllers) + return log_oom(); + + r = cg_kernel_controllers(controllers); + if (r < 0) + return log_error_errno(r, "Failed to determine cgroup controllers: %m"); + + for (;;) { + _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL; + + controller = set_steal_first(controllers); + if (!controller) + break; + + origin = prefix_root("/sys/fs/cgroup/", controller); + if (!origin) + return log_oom(); + + r = readlink_malloc(origin, &combined); + if (r == -EINVAL) { + /* Not a symbolic link, but directly a single cgroup hierarchy */ + + r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true); + if (r < 0) + return r; + + } else if (r < 0) + return log_error_errno(r, "Failed to read link %s: %m", origin); + else { + _cleanup_free_ char *target = NULL; + + target = prefix_root(dest, origin); + if (!target) + return log_oom(); + + /* A symbolic link, a combination of controllers in one hierarchy */ + + if (!filename_is_valid(combined)) { + log_warning("Ignoring invalid combined hierarchy %s.", combined); + continue; + } + + r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true); + if (r < 0) + return r; + + r = symlink_idempotent(combined, target); + if (r == -EINVAL) { + log_error("Invalid existing symlink for combined hierarchy"); + return r; + } + if (r < 0) + return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m"); + } + } + +skip_controllers: + r = mount_legacy_cgroup_hierarchy(dest, "none,name=systemd,xattr", "systemd", false); + if (r < 0) + return r; + + if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0) + return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root); + + return 0; +} + +static int mount_unified_cgroups(const char *dest) { + const char *p; + int r; + + assert(dest); + + p = strjoina(dest, "/sys/fs/cgroup"); + + r = path_is_mount_point(p, AT_SYMLINK_FOLLOW); + if (r < 0) + return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p); + if (r > 0) { + p = strjoina(dest, "/sys/fs/cgroup/cgroup.procs"); + if (access(p, F_OK) >= 0) + return 0; + if (errno != ENOENT) + return log_error_errno(errno, "Failed to determine if mount point %s contains the unified cgroup hierarchy: %m", p); + + log_error("%s is already mounted but not a unified cgroup hierarchy. Refusing.", p); + return -EINVAL; + } + + if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0) + return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p); + + return 0; +} + +int mount_cgroups( + const char *dest, + bool unified_requested, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + if (unified_requested) + return mount_unified_cgroups(dest); + else + return mount_legacy_cgroups(dest, userns, uid_shift, uid_range, selinux_apifs_context); +} + +int mount_systemd_cgroup_writable( + const char *dest, + bool unified_requested) { + + _cleanup_free_ char *own_cgroup_path = NULL; + const char *systemd_root, *systemd_own; + int r; + + assert(dest); + + r = cg_pid_get_path(NULL, 0, &own_cgroup_path); + if (r < 0) + return log_error_errno(r, "Failed to determine our own cgroup path: %m"); + + /* If we are living in the top-level, then there's nothing to do... */ + if (path_equal(own_cgroup_path, "/")) + return 0; + + if (unified_requested) { + systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path); + systemd_root = prefix_roota(dest, "/sys/fs/cgroup"); + } else { + systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path); + systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd"); + } + + /* Make our own cgroup a (writable) bind mount */ + if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0) + return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path); + + /* And then remount the systemd cgroup root read-only */ + if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0) + return log_error_errno(errno, "Failed to mount cgroup root read-only: %m"); + + return 0; +} + +int setup_volatile_state( + const char *directory, + VolatileMode mode, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + _cleanup_free_ char *buf = NULL; + const char *p, *options; + int r; + + assert(directory); + + if (mode != VOLATILE_STATE) + return 0; + + /* --volatile=state means we simply overmount /var + with a tmpfs, and the rest read-only. */ + + r = bind_remount_recursive(directory, true); + if (r < 0) + return log_error_errno(r, "Failed to remount %s read-only: %m", directory); + + p = prefix_roota(directory, "/var"); + r = mkdir(p, 0755); + if (r < 0 && errno != EEXIST) + return log_error_errno(errno, "Failed to create %s: %m", directory); + + options = "mode=755"; + r = tmpfs_patch_options(options, userns, uid_shift, uid_range, selinux_apifs_context, &buf); + if (r < 0) + return log_oom(); + if (r > 0) + options = buf; + + if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, options) < 0) + return log_error_errno(errno, "Failed to mount tmpfs to /var: %m"); + + return 0; +} + +int setup_volatile( + const char *directory, + VolatileMode mode, + bool userns, uid_t uid_shift, uid_t uid_range, + const char *selinux_apifs_context) { + + bool tmpfs_mounted = false, bind_mounted = false; + char template[] = "/tmp/nspawn-volatile-XXXXXX"; + _cleanup_free_ char *buf = NULL; + const char *f, *t, *options; + int r; + + assert(directory); + + if (mode != VOLATILE_YES) + return 0; + + /* --volatile=yes means we mount a tmpfs to the root dir, and + the original /usr to use inside it, and that read-only. */ + + if (!mkdtemp(template)) + return log_error_errno(errno, "Failed to create temporary directory: %m"); + + options = "mode=755"; + r = tmpfs_patch_options(options, userns, uid_shift, uid_range, selinux_apifs_context, &buf); + if (r < 0) + return log_oom(); + if (r > 0) + options = buf; + + if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, options) < 0) { + r = log_error_errno(errno, "Failed to mount tmpfs for root directory: %m"); + goto fail; + } + + tmpfs_mounted = true; + + f = prefix_roota(directory, "/usr"); + t = prefix_roota(template, "/usr"); + + r = mkdir(t, 0755); + if (r < 0 && errno != EEXIST) { + r = log_error_errno(errno, "Failed to create %s: %m", t); + goto fail; + } + + if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) { + r = log_error_errno(errno, "Failed to create /usr bind mount: %m"); + goto fail; + } + + bind_mounted = true; + + r = bind_remount_recursive(t, true); + if (r < 0) { + log_error_errno(r, "Failed to remount %s read-only: %m", t); + goto fail; + } + + if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) { + r = log_error_errno(errno, "Failed to move root mount: %m"); + goto fail; + } + + (void) rmdir(template); + + return 0; + +fail: + if (bind_mounted) + (void) umount(t); + + if (tmpfs_mounted) + (void) umount(template); + (void) rmdir(template); + return r; +} + +VolatileMode volatile_mode_from_string(const char *s) { + int b; + + if (isempty(s)) + return _VOLATILE_MODE_INVALID; + + b = parse_boolean(s); + if (b > 0) + return VOLATILE_YES; + if (b == 0) + return VOLATILE_NO; + + if (streq(s, "state")) + return VOLATILE_STATE; + + return _VOLATILE_MODE_INVALID; +} diff --git a/src/nspawn/nspawn.h b/src/nspawn/nspawn-mount.h index 2124b434fe..5abd44cc4b 100644 --- a/src/nspawn/nspawn.h +++ b/src/nspawn/nspawn-mount.h @@ -21,11 +21,8 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <inttypes.h> #include <stdbool.h> -#include "list.h" - typedef enum VolatileMode { VOLATILE_NO, VOLATILE_YES, @@ -52,18 +49,22 @@ typedef struct CustomMount { char **lower; } CustomMount; -typedef struct ExposePort { - int protocol; - uint16_t host_port; - uint16_t container_port; - LIST_FIELDS(struct ExposePort, ports); -} ExposePort; +CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t); void custom_mount_free_all(CustomMount *l, unsigned n); int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only); int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s); -void expose_port_free_all(ExposePort *p); -int expose_port_parse(ExposePort **l, const char *s); +int custom_mount_compare(const void *a, const void *b); + +int mount_all(const char *dest, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context); + +int mount_cgroups(const char *dest, bool unified_requested, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context); +int mount_systemd_cgroup_writable(const char *dest, bool unified_requested); + +int mount_custom(const char *dest, CustomMount *mounts, unsigned n, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context); + +int setup_volatile(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context); +int setup_volatile_state(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context); VolatileMode volatile_mode_from_string(const char *s); diff --git a/src/nspawn/nspawn-network.c b/src/nspawn/nspawn-network.c new file mode 100644 index 0000000000..74abe5379a --- /dev/null +++ b/src/nspawn/nspawn-network.c @@ -0,0 +1,440 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <linux/veth.h> +#include <net/if.h> + +#include "sd-id128.h" +#include "sd-netlink.h" +#include "libudev.h" + +#include "util.h" +#include "ether-addr-util.h" +#include "siphash24.h" +#include "netlink-util.h" +#include "udev-util.h" + +#include "nspawn-network.h" + +#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) +#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2) +#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f) + +static int generate_mac( + const char *machine_name, + struct ether_addr *mac, + sd_id128_t hash_key, + uint64_t idx) { + + uint8_t result[8]; + size_t l, sz; + uint8_t *v, *i; + int r; + + l = strlen(machine_name); + sz = sizeof(sd_id128_t) + l; + if (idx > 0) + sz += sizeof(idx); + + v = alloca(sz); + + /* fetch some persistent data unique to the host */ + r = sd_id128_get_machine((sd_id128_t*) v); + if (r < 0) + return r; + + /* combine with some data unique (on this host) to this + * container instance */ + i = mempcpy(v + sizeof(sd_id128_t), machine_name, l); + if (idx > 0) { + idx = htole64(idx); + memcpy(i, &idx, sizeof(idx)); + } + + /* Let's hash the host machine ID plus the container name. We + * use a fixed, but originally randomly created hash key here. */ + siphash24(result, v, sz, hash_key.bytes); + + assert_cc(ETH_ALEN <= sizeof(result)); + memcpy(mac->ether_addr_octet, result, ETH_ALEN); + + /* see eth_random_addr in the kernel */ + mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ + mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ + + return 0; +} + +int setup_veth(const char *machine_name, + pid_t pid, + char iface_name[IFNAMSIZ], + bool bridge) { + + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + struct ether_addr mac_host, mac_container; + int r, i; + + /* Use two different interface name prefixes depending whether + * we are in bridge mode or not. */ + snprintf(iface_name, IFNAMSIZ - 1, "%s-%s", + bridge ? "vb" : "ve", machine_name); + + r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0); + if (r < 0) + return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m"); + + r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0); + if (r < 0) + return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m"); + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); + if (r < 0) + return log_error_errno(r, "Failed to allocate netlink message: %m"); + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, iface_name); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface name: %m"); + + r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host); + if (r < 0) + return log_error_errno(r, "Failed to add netlink MAC address: %m"); + + r = sd_netlink_message_open_container(m, IFLA_LINKINFO); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth"); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_open_container(m, VETH_INFO_PEER); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, "host0"); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface name: %m"); + + r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container); + if (r < 0) + return log_error_errno(r, "Failed to add netlink MAC address: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); + if (r < 0) + return log_error_errno(r, "Failed to add netlink namespace field: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_call(rtnl, m, 0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to add new veth interfaces (host0, %s): %m", iface_name); + + i = (int) if_nametoindex(iface_name); + if (i <= 0) + return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name); + + return i; +} + +int setup_bridge(const char *veth_name, const char *bridge_name) { + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + int r, bridge_ifi; + + assert(veth_name); + assert(bridge_name); + + bridge_ifi = (int) if_nametoindex(bridge_name); + if (bridge_ifi <= 0) + return log_error_errno(errno, "Failed to resolve interface %s: %m", bridge_name); + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); + if (r < 0) + return log_error_errno(r, "Failed to allocate netlink message: %m"); + + r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); + if (r < 0) + return log_error_errno(r, "Failed to set IFF_UP flag: %m"); + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface name field: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi); + if (r < 0) + return log_error_errno(r, "Failed to add netlink master field: %m"); + + r = sd_netlink_call(rtnl, m, 0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to add veth interface to bridge: %m"); + + return bridge_ifi; +} + +static int parse_interface(struct udev *udev, const char *name) { + _cleanup_udev_device_unref_ struct udev_device *d = NULL; + char ifi_str[2 + DECIMAL_STR_MAX(int)]; + int ifi; + + ifi = (int) if_nametoindex(name); + if (ifi <= 0) + return log_error_errno(errno, "Failed to resolve interface %s: %m", name); + + sprintf(ifi_str, "n%i", ifi); + d = udev_device_new_from_device_id(udev, ifi_str); + if (!d) + return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name); + + if (udev_device_get_is_initialized(d) <= 0) { + log_error("Network interface %s is not initialized yet.", name); + return -EBUSY; + } + + return ifi; +} + +int move_network_interfaces(pid_t pid, char **ifaces) { + _cleanup_udev_unref_ struct udev *udev = NULL; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + char **i; + int r; + + if (strv_isempty(ifaces)) + return 0; + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + udev = udev_new(); + if (!udev) { + log_error("Failed to connect to udev."); + return -ENOMEM; + } + + STRV_FOREACH(i, ifaces) { + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + int ifi; + + ifi = parse_interface(udev, *i); + if (ifi < 0) + return ifi; + + r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); + if (r < 0) + return log_error_errno(r, "Failed to allocate netlink message: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); + if (r < 0) + return log_error_errno(r, "Failed to append namespace PID to netlink message: %m"); + + r = sd_netlink_call(rtnl, m, 0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i); + } + + return 0; +} + +int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) { + _cleanup_udev_unref_ struct udev *udev = NULL; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + unsigned idx = 0; + char **i; + int r; + + if (strv_isempty(ifaces)) + return 0; + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + udev = udev_new(); + if (!udev) { + log_error("Failed to connect to udev."); + return -ENOMEM; + } + + STRV_FOREACH(i, ifaces) { + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + _cleanup_free_ char *n = NULL; + struct ether_addr mac; + int ifi; + + ifi = parse_interface(udev, *i); + if (ifi < 0) + return ifi; + + r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++); + if (r < 0) + return log_error_errno(r, "Failed to create MACVLAN MAC address: %m"); + + r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); + if (r < 0) + return log_error_errno(r, "Failed to allocate netlink message: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface index: %m"); + + n = strappend("mv-", *i); + if (!n) + return log_oom(); + + strshorten(n, IFNAMSIZ-1); + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface name: %m"); + + r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac); + if (r < 0) + return log_error_errno(r, "Failed to add netlink MAC address: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); + if (r < 0) + return log_error_errno(r, "Failed to add netlink namespace field: %m"); + + r = sd_netlink_message_open_container(m, IFLA_LINKINFO); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan"); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE); + if (r < 0) + return log_error_errno(r, "Failed to append macvlan mode: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_call(rtnl, m, 0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to add new macvlan interfaces: %m"); + } + + return 0; +} + +int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) { + _cleanup_udev_unref_ struct udev *udev = NULL; + _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; + char **i; + int r; + + if (strv_isempty(ifaces)) + return 0; + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + udev = udev_new(); + if (!udev) { + log_error("Failed to connect to udev."); + return -ENOMEM; + } + + STRV_FOREACH(i, ifaces) { + _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; + _cleanup_free_ char *n = NULL; + int ifi; + + ifi = parse_interface(udev, *i); + if (ifi < 0) + return ifi; + + r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); + if (r < 0) + return log_error_errno(r, "Failed to allocate netlink message: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface index: %m"); + + n = strappend("iv-", *i); + if (!n) + return log_oom(); + + strshorten(n, IFNAMSIZ-1); + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); + if (r < 0) + return log_error_errno(r, "Failed to add netlink interface name: %m"); + + r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); + if (r < 0) + return log_error_errno(r, "Failed to add netlink namespace field: %m"); + + r = sd_netlink_message_open_container(m, IFLA_LINKINFO); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan"); + if (r < 0) + return log_error_errno(r, "Failed to open netlink container: %m"); + + r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2); + if (r < 0) + return log_error_errno(r, "Failed to add ipvlan mode: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_message_close_container(m); + if (r < 0) + return log_error_errno(r, "Failed to close netlink container: %m"); + + r = sd_netlink_call(rtnl, m, 0, NULL); + if (r < 0) + return log_error_errno(r, "Failed to add new ipvlan interfaces: %m"); + } + + return 0; +} diff --git a/src/nspawn/nspawn-network.h b/src/nspawn/nspawn-network.h new file mode 100644 index 0000000000..311e6d06cb --- /dev/null +++ b/src/nspawn/nspawn-network.h @@ -0,0 +1,36 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <net/if.h> + +#include <sys/types.h> +#include <stdbool.h> + +int setup_veth(const char *machine_name, pid_t pid, char iface_name[IFNAMSIZ], bool bridge); + +int setup_bridge(const char *veth_name, const char *bridge_name); + +int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces); +int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces); + +int move_network_interfaces(pid_t pid, char **ifaces); diff --git a/src/nspawn/nspawn-register.c b/src/nspawn/nspawn-register.c new file mode 100644 index 0000000000..b2776a61c2 --- /dev/null +++ b/src/nspawn/nspawn-register.c @@ -0,0 +1,244 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include "sd-bus.h" + +#include "util.h" +#include "strv.h" +#include "bus-util.h" +#include "bus-error.h" + +#include "nspawn-register.h" + +int register_machine( + const char *machine_name, + pid_t pid, + const char *directory, + sd_id128_t uuid, + int local_ifindex, + const char *slice, + CustomMount *mounts, + unsigned n_mounts, + int kill_signal, + char **properties, + bool keep_unit) { + + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; + int r; + + r = sd_bus_default_system(&bus); + if (r < 0) + return log_error_errno(r, "Failed to open system bus: %m"); + + if (keep_unit) { + r = sd_bus_call_method( + bus, + "org.freedesktop.machine1", + "/org/freedesktop/machine1", + "org.freedesktop.machine1.Manager", + "RegisterMachineWithNetwork", + &error, + NULL, + "sayssusai", + machine_name, + SD_BUS_MESSAGE_APPEND_ID128(uuid), + "nspawn", + "container", + (uint32_t) pid, + strempty(directory), + local_ifindex > 0 ? 1 : 0, local_ifindex); + } else { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + char **i; + unsigned j; + + r = sd_bus_message_new_method_call( + bus, + &m, + "org.freedesktop.machine1", + "/org/freedesktop/machine1", + "org.freedesktop.machine1.Manager", + "CreateMachineWithNetwork"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append( + m, + "sayssusai", + machine_name, + SD_BUS_MESSAGE_APPEND_ID128(uuid), + "nspawn", + "container", + (uint32_t) pid, + strempty(directory), + local_ifindex > 0 ? 1 : 0, local_ifindex); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_open_container(m, 'a', "(sv)"); + if (r < 0) + return bus_log_create_error(r); + + if (!isempty(slice)) { + r = sd_bus_message_append(m, "(sv)", "Slice", "s", slice); + if (r < 0) + return bus_log_create_error(r); + } + + r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict"); + if (r < 0) + return bus_log_create_error(r); + + /* If you make changes here, also make sure to update + * systemd-nspawn@.service, to keep the device + * policies in sync regardless if we are run with or + * without the --keep-unit switch. */ + r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9, + /* Allow the container to + * access and create the API + * device nodes, so that + * PrivateDevices= in the + * container can work + * fine */ + "/dev/null", "rwm", + "/dev/zero", "rwm", + "/dev/full", "rwm", + "/dev/random", "rwm", + "/dev/urandom", "rwm", + "/dev/tty", "rwm", + "/dev/net/tun", "rwm", + /* Allow the container + * access to ptys. However, + * do not permit the + * container to ever create + * these device nodes. */ + "/dev/pts/ptmx", "rw", + "char-pts", "rw"); + if (r < 0) + return bus_log_create_error(r); + + for (j = 0; j < n_mounts; j++) { + CustomMount *cm = mounts + j; + + if (cm->type != CUSTOM_MOUNT_BIND) + continue; + + r = is_device_node(cm->source); + if (r < 0) + return log_error_errno(r, "Failed to stat %s: %m", cm->source); + + if (r) { + r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 1, + cm->source, cm->read_only ? "r" : "rw"); + if (r < 0) + return log_error_errno(r, "Failed to append message arguments: %m"); + } + } + + if (kill_signal != 0) { + r = sd_bus_message_append(m, "(sv)", "KillSignal", "i", kill_signal); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(m, "(sv)", "KillMode", "s", "mixed"); + if (r < 0) + return bus_log_create_error(r); + } + + STRV_FOREACH(i, properties) { + r = sd_bus_message_open_container(m, 'r', "sv"); + if (r < 0) + return bus_log_create_error(r); + + r = bus_append_unit_property_assignment(m, *i); + if (r < 0) + return r; + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + } + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_call(bus, m, 0, &error, NULL); + } + + if (r < 0) { + log_error("Failed to register machine: %s", bus_error_message(&error, r)); + return r; + } + + return 0; +} + +int terminate_machine(pid_t pid) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; + const char *path; + int r; + + r = sd_bus_default_system(&bus); + if (r < 0) + return log_error_errno(r, "Failed to open system bus: %m"); + + r = sd_bus_call_method( + bus, + "org.freedesktop.machine1", + "/org/freedesktop/machine1", + "org.freedesktop.machine1.Manager", + "GetMachineByPID", + &error, + &reply, + "u", + (uint32_t) pid); + if (r < 0) { + /* Note that the machine might already have been + * cleaned up automatically, hence don't consider it a + * failure if we cannot get the machine object. */ + log_debug("Failed to get machine: %s", bus_error_message(&error, r)); + return 0; + } + + r = sd_bus_message_read(reply, "o", &path); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_call_method( + bus, + "org.freedesktop.machine1", + path, + "org.freedesktop.machine1.Machine", + "Terminate", + &error, + NULL, + NULL); + if (r < 0) { + log_debug("Failed to terminate machine: %s", bus_error_message(&error, r)); + return 0; + } + + return 0; +} diff --git a/src/nspawn/nspawn-register.h b/src/nspawn/nspawn-register.h new file mode 100644 index 0000000000..b27841ff59 --- /dev/null +++ b/src/nspawn/nspawn-register.h @@ -0,0 +1,31 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/types.h> + +#include "sd-id128.h" + +#include "nspawn-mount.h" + +int register_machine(const char *machine_name, pid_t pid, const char *directory, sd_id128_t uuid, int local_ifindex, const char *slice, CustomMount *mounts, unsigned n_mounts, int kill_signal, char **properties, bool keep_unit); +int terminate_machine(pid_t pid); diff --git a/src/nspawn/nspawn-settings.c b/src/nspawn/nspawn-settings.c index 9a403a3068..419f5d1c40 100644 --- a/src/nspawn/nspawn-settings.c +++ b/src/nspawn/nspawn-settings.c @@ -24,7 +24,6 @@ #include "strv.h" #include "cap-list.h" -#include "nspawn.h" #include "nspawn-settings.h" int settings_load(FILE *f, const char *path, Settings **ret) { diff --git a/src/nspawn/nspawn-settings.h b/src/nspawn/nspawn-settings.h index d9b3b2f7c0..4cec40c1b7 100644 --- a/src/nspawn/nspawn-settings.h +++ b/src/nspawn/nspawn-settings.h @@ -24,7 +24,9 @@ #include <stdio.h> #include "macro.h" -#include "nspawn.h" + +#include "nspawn-mount.h" +#include "nspawn-expose-ports.h" typedef enum SettingsMask { SETTING_BOOT = 1 << 0, diff --git a/src/nspawn/nspawn-setuid.c b/src/nspawn/nspawn-setuid.c new file mode 100644 index 0000000000..eda7f62900 --- /dev/null +++ b/src/nspawn/nspawn-setuid.c @@ -0,0 +1,272 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <sys/types.h> +#include <unistd.h> +#include <grp.h> + +#include "util.h" +#include "signal-util.h" +#include "mkdir.h" +#include "process-util.h" + +#include "nspawn-setuid.h" + +static int spawn_getent(const char *database, const char *key, pid_t *rpid) { + int pipe_fds[2]; + pid_t pid; + + assert(database); + assert(key); + assert(rpid); + + if (pipe2(pipe_fds, O_CLOEXEC) < 0) + return log_error_errno(errno, "Failed to allocate pipe: %m"); + + pid = fork(); + if (pid < 0) + return log_error_errno(errno, "Failed to fork getent child: %m"); + else if (pid == 0) { + int nullfd; + char *empty_env = NULL; + + if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0) + _exit(EXIT_FAILURE); + + if (pipe_fds[0] > 2) + safe_close(pipe_fds[0]); + if (pipe_fds[1] > 2) + safe_close(pipe_fds[1]); + + nullfd = open("/dev/null", O_RDWR); + if (nullfd < 0) + _exit(EXIT_FAILURE); + + if (dup3(nullfd, STDIN_FILENO, 0) < 0) + _exit(EXIT_FAILURE); + + if (dup3(nullfd, STDERR_FILENO, 0) < 0) + _exit(EXIT_FAILURE); + + if (nullfd > 2) + safe_close(nullfd); + + (void) reset_all_signal_handlers(); + (void) reset_signal_mask(); + close_all_fds(NULL, 0); + + execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env); + execle("/bin/getent", "getent", database, key, NULL, &empty_env); + _exit(EXIT_FAILURE); + } + + pipe_fds[1] = safe_close(pipe_fds[1]); + + *rpid = pid; + + return pipe_fds[0]; +} + +int change_uid_gid(const char *user, char **_home) { + char line[LINE_MAX], *x, *u, *g, *h; + const char *word, *state; + _cleanup_free_ uid_t *uids = NULL; + _cleanup_free_ char *home = NULL; + _cleanup_fclose_ FILE *f = NULL; + _cleanup_close_ int fd = -1; + unsigned n_uids = 0; + size_t sz = 0, l; + uid_t uid; + gid_t gid; + pid_t pid; + int r; + + assert(_home); + + if (!user || streq(user, "root") || streq(user, "0")) { + /* Reset everything fully to 0, just in case */ + + r = reset_uid_gid(); + if (r < 0) + return log_error_errno(r, "Failed to become root: %m"); + + *_home = NULL; + return 0; + } + + /* First, get user credentials */ + fd = spawn_getent("passwd", user, &pid); + if (fd < 0) + return fd; + + f = fdopen(fd, "r"); + if (!f) + return log_oom(); + fd = -1; + + if (!fgets(line, sizeof(line), f)) { + + if (!ferror(f)) { + log_error("Failed to resolve user %s.", user); + return -ESRCH; + } + + log_error_errno(errno, "Failed to read from getent: %m"); + return -errno; + } + + truncate_nl(line); + + wait_for_terminate_and_warn("getent passwd", pid, true); + + x = strchr(line, ':'); + if (!x) { + log_error("/etc/passwd entry has invalid user field."); + return -EIO; + } + + u = strchr(x+1, ':'); + if (!u) { + log_error("/etc/passwd entry has invalid password field."); + return -EIO; + } + + u++; + g = strchr(u, ':'); + if (!g) { + log_error("/etc/passwd entry has invalid UID field."); + return -EIO; + } + + *g = 0; + g++; + x = strchr(g, ':'); + if (!x) { + log_error("/etc/passwd entry has invalid GID field."); + return -EIO; + } + + *x = 0; + h = strchr(x+1, ':'); + if (!h) { + log_error("/etc/passwd entry has invalid GECOS field."); + return -EIO; + } + + h++; + x = strchr(h, ':'); + if (!x) { + log_error("/etc/passwd entry has invalid home directory field."); + return -EIO; + } + + *x = 0; + + r = parse_uid(u, &uid); + if (r < 0) { + log_error("Failed to parse UID of user."); + return -EIO; + } + + r = parse_gid(g, &gid); + if (r < 0) { + log_error("Failed to parse GID of user."); + return -EIO; + } + + home = strdup(h); + if (!home) + return log_oom(); + + /* Second, get group memberships */ + fd = spawn_getent("initgroups", user, &pid); + if (fd < 0) + return fd; + + fclose(f); + f = fdopen(fd, "r"); + if (!f) + return log_oom(); + fd = -1; + + if (!fgets(line, sizeof(line), f)) { + if (!ferror(f)) { + log_error("Failed to resolve user %s.", user); + return -ESRCH; + } + + log_error_errno(errno, "Failed to read from getent: %m"); + return -errno; + } + + truncate_nl(line); + + wait_for_terminate_and_warn("getent initgroups", pid, true); + + /* Skip over the username and subsequent separator whitespace */ + x = line; + x += strcspn(x, WHITESPACE); + x += strspn(x, WHITESPACE); + + FOREACH_WORD(word, l, x, state) { + char c[l+1]; + + memcpy(c, word, l); + c[l] = 0; + + if (!GREEDY_REALLOC(uids, sz, n_uids+1)) + return log_oom(); + + r = parse_uid(c, &uids[n_uids++]); + if (r < 0) { + log_error("Failed to parse group data from getent."); + return -EIO; + } + } + + r = mkdir_parents(home, 0775); + if (r < 0) + return log_error_errno(r, "Failed to make home root directory: %m"); + + r = mkdir_safe(home, 0755, uid, gid); + if (r < 0 && r != -EEXIST) + return log_error_errno(r, "Failed to make home directory: %m"); + + (void) fchown(STDIN_FILENO, uid, gid); + (void) fchown(STDOUT_FILENO, uid, gid); + (void) fchown(STDERR_FILENO, uid, gid); + + if (setgroups(n_uids, uids) < 0) + return log_error_errno(errno, "Failed to set auxiliary groups: %m"); + + if (setresgid(gid, gid, gid) < 0) + return log_error_errno(errno, "setregid() failed: %m"); + + if (setresuid(uid, uid, uid) < 0) + return log_error_errno(errno, "setreuid() failed: %m"); + + if (_home) { + *_home = home; + home = NULL; + } + + return 0; +} diff --git a/src/nspawn/nspawn-setuid.h b/src/nspawn/nspawn-setuid.h new file mode 100644 index 0000000000..33be44a946 --- /dev/null +++ b/src/nspawn/nspawn-setuid.h @@ -0,0 +1,24 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2015 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +int change_uid_gid(const char *user, char **ret); diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c index a8afcd1466..33943a4b2f 100644 --- a/src/nspawn/nspawn.c +++ b/src/nspawn/nspawn.c @@ -19,91 +19,78 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <signal.h> -#include <sched.h> -#include <unistd.h> -#include <sys/types.h> -#include <sys/mount.h> -#include <stdlib.h> -#include <string.h> -#include <stdio.h> +#ifdef HAVE_BLKID +#include <blkid/blkid.h> +#endif #include <errno.h> -#include <sys/prctl.h> #include <getopt.h> -#include <grp.h> -#include <linux/fs.h> -#include <sys/socket.h> -#include <linux/netlink.h> -#include <net/if.h> -#include <linux/veth.h> -#include <sys/personality.h> #include <linux/loop.h> -#include <sys/file.h> - -#ifdef HAVE_SELINUX -#include <selinux/selinux.h> -#endif - +#include <sched.h> #ifdef HAVE_SECCOMP #include <seccomp.h> #endif - -#ifdef HAVE_BLKID -#include <blkid/blkid.h> +#ifdef HAVE_SELINUX +#include <selinux/selinux.h> #endif +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/file.h> +#include <sys/mount.h> +#include <sys/personality.h> +#include <sys/prctl.h> +#include <sys/types.h> +#include <unistd.h> #include "sd-daemon.h" -#include "sd-bus.h" #include "sd-id128.h" -#include "sd-netlink.h" -#include "random-util.h" -#include "log.h" -#include "util.h" -#include "mkdir.h" -#include "rm-rf.h" -#include "macro.h" -#include "missing.h" + +#include "barrier.h" +#include "base-filesystem.h" +#include "blkid-util.h" +#include "btrfs-util.h" +#include "build.h" +#include "cap-list.h" +#include "capability.h" #include "cgroup-util.h" -#include "strv.h" -#include "path-util.h" -#include "loopback-setup.h" +#include "copy.h" #include "dev-setup.h" +#include "env-util.h" +#include "event-util.h" #include "fdset.h" -#include "build.h" #include "fileio.h" -#include "bus-util.h" -#include "bus-error.h" -#include "ptyfwd.h" -#include "env-util.h" -#include "netlink-util.h" -#include "udev-util.h" -#include "blkid-util.h" +#include "formats-util.h" #include "gpt.h" -#include "siphash24.h" -#include "copy.h" -#include "base-filesystem.h" -#include "barrier.h" -#include "event-util.h" -#include "capability.h" -#include "cap-list.h" -#include "btrfs-util.h" +#include "hostname-util.h" +#include "log.h" +#include "loopback-setup.h" #include "machine-image.h" -#include "list.h" -#include "in-addr-util.h" -#include "firewall-util.h" -#include "local-addresses.h" -#include "formats-util.h" +#include "macro.h" +#include "missing.h" +#include "mkdir.h" +#include "netlink-util.h" +#include "path-util.h" #include "process-util.h" -#include "terminal-util.h" -#include "hostname-util.h" -#include "signal-util.h" - +#include "ptyfwd.h" +#include "random-util.h" +#include "rm-rf.h" #ifdef HAVE_SECCOMP #include "seccomp-util.h" #endif +#include "signal-util.h" +#include "strv.h" +#include "terminal-util.h" +#include "udev-util.h" +#include "util.h" -#include "nspawn.h" #include "nspawn-settings.h" +#include "nspawn-mount.h" +#include "nspawn-network.h" +#include "nspawn-expose-ports.h" +#include "nspawn-cgroup.h" +#include "nspawn-register.h" +#include "nspawn-setuid.h" typedef enum ContainerStatus { CONTAINER_TERMINATED, @@ -256,63 +243,6 @@ static void help(void) { , program_invocation_short_name); } -static CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t) { - CustomMount *c, *ret; - - assert(l); - assert(n); - assert(t >= 0); - assert(t < _CUSTOM_MOUNT_TYPE_MAX); - - c = realloc(*l, (*n + 1) * sizeof(CustomMount)); - if (!c) - return NULL; - - *l = c; - ret = *l + *n; - (*n)++; - - *ret = (CustomMount) { .type = t }; - - return ret; -} - -void custom_mount_free_all(CustomMount *l, unsigned n) { - unsigned i; - - for (i = 0; i < n; i++) { - CustomMount *m = l + i; - - free(m->source); - free(m->destination); - free(m->options); - - if (m->work_dir) { - (void) rm_rf(m->work_dir, REMOVE_ROOT|REMOVE_PHYSICAL); - free(m->work_dir); - } - - strv_free(m->lower); - } - - free(l); -} - -static int custom_mount_compare(const void *a, const void *b) { - const CustomMount *x = a, *y = b; - int r; - - r = path_compare(x->destination, y->destination); - if (r != 0) - return r; - - if (x->type < y->type) - return -1; - if (x->type > y->type) - return 1; - - return 0; -} static int custom_mounts_prepare(void) { unsigned i; @@ -392,161 +322,6 @@ static int detect_unified_cgroup_hierarchy(void) { return 0; } -VolatileMode volatile_mode_from_string(const char *s) { - int b; - - if (isempty(s)) - return _VOLATILE_MODE_INVALID; - - b = parse_boolean(s); - if (b > 0) - return VOLATILE_YES; - if (b == 0) - return VOLATILE_NO; - - if (streq(s, "state")) - return VOLATILE_STATE; - - return _VOLATILE_MODE_INVALID; -} - -int expose_port_parse(ExposePort **l, const char *s) { - - const char *split, *e; - uint16_t container_port, host_port; - int protocol; - ExposePort *p; - int r; - - if ((e = startswith(s, "tcp:"))) - protocol = IPPROTO_TCP; - else if ((e = startswith(s, "udp:"))) - protocol = IPPROTO_UDP; - else { - e = s; - protocol = IPPROTO_TCP; - } - - split = strchr(e, ':'); - if (split) { - char v[split - e + 1]; - - memcpy(v, e, split - e); - v[split - e] = 0; - - r = safe_atou16(v, &host_port); - if (r < 0 || host_port <= 0) - return -EINVAL; - - r = safe_atou16(split + 1, &container_port); - } else { - r = safe_atou16(e, &container_port); - host_port = container_port; - } - - if (r < 0 || container_port <= 0) - return -EINVAL; - - LIST_FOREACH(ports, p, arg_expose_ports) - if (p->protocol == protocol && p->host_port == host_port) - return -EEXIST; - - p = new(ExposePort, 1); - if (!p) - return -ENOMEM; - - p->protocol = protocol; - p->host_port = host_port; - p->container_port = container_port; - - LIST_PREPEND(ports, *l, p); - - return 0; -} - -int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only) { - _cleanup_free_ char *source = NULL, *destination = NULL, *opts = NULL; - const char *p = s; - CustomMount *m; - int r; - - assert(l); - assert(n); - - r = extract_many_words(&p, ":", EXTRACT_DONT_COALESCE_SEPARATORS, &source, &destination, NULL); - if (r < 0) - return r; - if (r == 0) - return -EINVAL; - - if (r == 1) { - destination = strdup(source); - if (!destination) - return -ENOMEM; - } - - if (r == 2 && !isempty(p)) { - opts = strdup(p); - if (!opts) - return -ENOMEM; - } - - if (!path_is_absolute(source)) - return -EINVAL; - - if (!path_is_absolute(destination)) - return -EINVAL; - - m = custom_mount_add(l, n, CUSTOM_MOUNT_BIND); - if (!m) - return log_oom(); - - m->source = source; - m->destination = destination; - m->read_only = read_only; - m->options = opts; - - source = destination = opts = NULL; - return 0; -} - -int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s) { - _cleanup_free_ char *path = NULL, *opts = NULL; - const char *p = s; - CustomMount *m; - int r; - - assert(l); - assert(n); - assert(s); - - r = extract_first_word(&p, &path, ":", EXTRACT_DONT_COALESCE_SEPARATORS); - if (r < 0) - return r; - if (r == 0) - return -EINVAL; - - if (isempty(p)) - opts = strdup("mode=0755"); - else - opts = strdup(p); - if (!opts) - return -ENOMEM; - - if (!path_is_absolute(path)) - return -EINVAL; - - m = custom_mount_add(l, n, CUSTOM_MOUNT_TMPFS); - if (!m) - return -ENOMEM; - - m->destination = path; - m->options = opts; - - path = opts = NULL; - return 0; -} - static int parse_argv(int argc, char *argv[]) { enum { @@ -1170,536 +945,6 @@ static int verify_arguments(void) { return 0; } -static int tmpfs_patch_options(const char *options, char **ret) { - char *buf = NULL; - - if (arg_userns && arg_uid_shift != 0) { - assert(arg_uid_shift != UID_INVALID); - - if (options) - (void) asprintf(&buf, "%s,uid=" UID_FMT ",gid=" UID_FMT, options, arg_uid_shift, arg_uid_shift); - else - (void) asprintf(&buf, "uid=" UID_FMT ",gid=" UID_FMT, arg_uid_shift, arg_uid_shift); - if (!buf) - return -ENOMEM; - - options = buf; - } - -#ifdef HAVE_SELINUX - if (arg_selinux_apifs_context) { - char *t; - - if (options) - t = strjoin(options, ",context=\"", arg_selinux_apifs_context, "\"", NULL); - else - t = strjoin("context=\"", arg_selinux_apifs_context, "\"", NULL); - if (!t) { - free(buf); - return -ENOMEM; - } - - free(buf); - buf = t; - } -#endif - - *ret = buf; - return !!buf; -} - -static int mount_all(const char *dest, bool userns) { - - typedef struct MountPoint { - const char *what; - const char *where; - const char *type; - const char *options; - unsigned long flags; - bool fatal; - bool userns; - } MountPoint; - - static const MountPoint mount_table[] = { - { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true }, - { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */ - { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */ - { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false }, - { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false }, - { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false }, - { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false }, - { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false }, -#ifdef HAVE_SELINUX - { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, false }, /* Bind mount first */ - { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, false }, /* Then, make it r/o */ -#endif - }; - - unsigned k; - int r; - - for (k = 0; k < ELEMENTSOF(mount_table); k++) { - _cleanup_free_ char *where = NULL, *options = NULL; - const char *o; - - if (userns != mount_table[k].userns) - continue; - - where = prefix_root(dest, mount_table[k].where); - if (!where) - return log_oom(); - - r = path_is_mount_point(where, AT_SYMLINK_FOLLOW); - if (r < 0 && r != -ENOENT) - return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where); - - /* Skip this entry if it is not a remount. */ - if (mount_table[k].what && r > 0) - continue; - - r = mkdir_p(where, 0755); - if (r < 0) { - if (mount_table[k].fatal) - return log_error_errno(r, "Failed to create directory %s: %m", where); - - log_warning_errno(r, "Failed to create directory %s: %m", where); - continue; - } - - o = mount_table[k].options; - if (streq_ptr(mount_table[k].type, "tmpfs")) { - r = tmpfs_patch_options(o, &options); - if (r < 0) - return log_oom(); - if (r > 0) - o = options; - } - - if (mount(mount_table[k].what, - where, - mount_table[k].type, - mount_table[k].flags, - o) < 0) { - - if (mount_table[k].fatal) - return log_error_errno(errno, "mount(%s) failed: %m", where); - - log_warning_errno(errno, "mount(%s) failed, ignoring: %m", where); - } - } - - return 0; -} - -static int parse_mount_bind_options(const char *options, unsigned long *mount_flags, char **mount_opts) { - const char *p = options; - unsigned long flags = *mount_flags; - char *opts = NULL; - - assert(options); - - for (;;) { - _cleanup_free_ char *word = NULL; - int r = extract_first_word(&p, &word, ",", 0); - if (r < 0) - return log_error_errno(r, "Failed to extract mount option: %m"); - if (r == 0) - break; - - if (streq(word, "rbind")) - flags |= MS_REC; - else if (streq(word, "norbind")) - flags &= ~MS_REC; - else { - log_error("Invalid bind mount option: %s", word); - return -EINVAL; - } - } - - *mount_flags = flags; - /* in the future mount_opts will hold string options for mount(2) */ - *mount_opts = opts; - - return 0; -} - -static int mount_bind(const char *dest, CustomMount *m) { - struct stat source_st, dest_st; - const char *where; - unsigned long mount_flags = MS_BIND | MS_REC; - _cleanup_free_ char *mount_opts = NULL; - int r; - - assert(m); - - if (m->options) { - r = parse_mount_bind_options(m->options, &mount_flags, &mount_opts); - if (r < 0) - return r; - } - - if (stat(m->source, &source_st) < 0) - return log_error_errno(errno, "Failed to stat %s: %m", m->source); - - where = prefix_roota(dest, m->destination); - - if (stat(where, &dest_st) >= 0) { - if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) { - log_error("Cannot bind mount directory %s on file %s.", m->source, where); - return -EINVAL; - } - - if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) { - log_error("Cannot bind mount file %s on directory %s.", m->source, where); - return -EINVAL; - } - - } else if (errno == ENOENT) { - r = mkdir_parents_label(where, 0755); - if (r < 0) - return log_error_errno(r, "Failed to make parents of %s: %m", where); - } else { - log_error_errno(errno, "Failed to stat %s: %m", where); - return -errno; - } - - /* Create the mount point. Any non-directory file can be - * mounted on any non-directory file (regular, fifo, socket, - * char, block). - */ - if (S_ISDIR(source_st.st_mode)) - r = mkdir_label(where, 0755); - else - r = touch(where); - if (r < 0 && r != -EEXIST) - return log_error_errno(r, "Failed to create mount point %s: %m", where); - - if (mount(m->source, where, NULL, mount_flags, mount_opts) < 0) - return log_error_errno(errno, "mount(%s) failed: %m", where); - - if (m->read_only) { - r = bind_remount_recursive(where, true); - if (r < 0) - return log_error_errno(r, "Read-only bind mount failed: %m"); - } - - return 0; -} - -static int mount_tmpfs(const char *dest, CustomMount *m) { - const char *where, *options; - _cleanup_free_ char *buf = NULL; - int r; - - assert(dest); - assert(m); - - where = prefix_roota(dest, m->destination); - - r = mkdir_p_label(where, 0755); - if (r < 0 && r != -EEXIST) - return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where); - - r = tmpfs_patch_options(m->options, &buf); - if (r < 0) - return log_oom(); - options = r > 0 ? buf : m->options; - - if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options) < 0) - return log_error_errno(errno, "tmpfs mount to %s failed: %m", where); - - return 0; -} - -static char *joined_and_escaped_lower_dirs(char * const *lower) { - _cleanup_strv_free_ char **sv = NULL; - - sv = strv_copy(lower); - if (!sv) - return NULL; - - strv_reverse(sv); - - if (!strv_shell_escape(sv, ",:")) - return NULL; - - return strv_join(sv, ":"); -} - -static int mount_overlay(const char *dest, CustomMount *m) { - _cleanup_free_ char *lower = NULL; - const char *where, *options; - int r; - - assert(dest); - assert(m); - - where = prefix_roota(dest, m->destination); - - r = mkdir_label(where, 0755); - if (r < 0 && r != -EEXIST) - return log_error_errno(r, "Creating mount point for overlay %s failed: %m", where); - - (void) mkdir_p_label(m->source, 0755); - - lower = joined_and_escaped_lower_dirs(m->lower); - if (!lower) - return log_oom(); - - if (m->read_only) { - _cleanup_free_ char *escaped_source = NULL; - - escaped_source = shell_escape(m->source, ",:"); - if (!escaped_source) - return log_oom(); - - options = strjoina("lowerdir=", escaped_source, ":", lower); - } else { - _cleanup_free_ char *escaped_source = NULL, *escaped_work_dir = NULL; - - assert(m->work_dir); - (void) mkdir_label(m->work_dir, 0700); - - escaped_source = shell_escape(m->source, ",:"); - if (!escaped_source) - return log_oom(); - escaped_work_dir = shell_escape(m->work_dir, ",:"); - if (!escaped_work_dir) - return log_oom(); - - options = strjoina("lowerdir=", lower, ",upperdir=", escaped_source, ",workdir=", escaped_work_dir); - } - - if (mount("overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options) < 0) - return log_error_errno(errno, "overlay mount to %s failed: %m", where); - - return 0; -} - -static int mount_custom(const char *dest) { - unsigned i; - int r; - - assert(dest); - - for (i = 0; i < arg_n_custom_mounts; i++) { - CustomMount *m = &arg_custom_mounts[i]; - - switch (m->type) { - - case CUSTOM_MOUNT_BIND: - r = mount_bind(dest, m); - break; - - case CUSTOM_MOUNT_TMPFS: - r = mount_tmpfs(dest, m); - break; - - case CUSTOM_MOUNT_OVERLAY: - r = mount_overlay(dest, m); - break; - - default: - assert_not_reached("Unknown custom mount type"); - } - - if (r < 0) - return r; - } - - return 0; -} - -static int mount_legacy_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) { - char *to; - int r; - - to = strjoina(dest, "/sys/fs/cgroup/", hierarchy); - - r = path_is_mount_point(to, 0); - if (r < 0 && r != -ENOENT) - return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to); - if (r > 0) - return 0; - - mkdir_p(to, 0755); - - /* The superblock mount options of the mount point need to be - * identical to the hosts', and hence writable... */ - if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0) - return log_error_errno(errno, "Failed to mount to %s: %m", to); - - /* ... hence let's only make the bind mount read-only, not the - * superblock. */ - if (read_only) { - if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0) - return log_error_errno(errno, "Failed to remount %s read-only: %m", to); - } - return 1; -} - -static int mount_legacy_cgroups(const char *dest) { - _cleanup_set_free_free_ Set *controllers = NULL; - const char *cgroup_root; - int r; - - cgroup_root = prefix_roota(dest, "/sys/fs/cgroup"); - - /* Mount a tmpfs to /sys/fs/cgroup if it's not mounted there yet. */ - r = path_is_mount_point(cgroup_root, AT_SYMLINK_FOLLOW); - if (r < 0) - return log_error_errno(r, "Failed to determine if /sys/fs/cgroup is already mounted: %m"); - if (r == 0) { - _cleanup_free_ char *options = NULL; - - r = tmpfs_patch_options("mode=755", &options); - if (r < 0) - return log_oom(); - - if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, options) < 0) - return log_error_errno(errno, "Failed to mount /sys/fs/cgroup: %m"); - } - - if (cg_unified() > 0) - goto skip_controllers; - - controllers = set_new(&string_hash_ops); - if (!controllers) - return log_oom(); - - r = cg_kernel_controllers(controllers); - if (r < 0) - return log_error_errno(r, "Failed to determine cgroup controllers: %m"); - - for (;;) { - _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL; - - controller = set_steal_first(controllers); - if (!controller) - break; - - origin = prefix_root("/sys/fs/cgroup/", controller); - if (!origin) - return log_oom(); - - r = readlink_malloc(origin, &combined); - if (r == -EINVAL) { - /* Not a symbolic link, but directly a single cgroup hierarchy */ - - r = mount_legacy_cgroup_hierarchy(dest, controller, controller, true); - if (r < 0) - return r; - - } else if (r < 0) - return log_error_errno(r, "Failed to read link %s: %m", origin); - else { - _cleanup_free_ char *target = NULL; - - target = prefix_root(dest, origin); - if (!target) - return log_oom(); - - /* A symbolic link, a combination of controllers in one hierarchy */ - - if (!filename_is_valid(combined)) { - log_warning("Ignoring invalid combined hierarchy %s.", combined); - continue; - } - - r = mount_legacy_cgroup_hierarchy(dest, combined, combined, true); - if (r < 0) - return r; - - r = symlink_idempotent(combined, target); - if (r == -EINVAL) { - log_error("Invalid existing symlink for combined hierarchy"); - return r; - } - if (r < 0) - return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m"); - } - } - -skip_controllers: - r = mount_legacy_cgroup_hierarchy(dest, "none,name=systemd,xattr", "systemd", false); - if (r < 0) - return r; - - if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0) - return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root); - - return 0; -} - -static int mount_unified_cgroups(const char *dest) { - const char *p; - int r; - - assert(dest); - - p = strjoina(dest, "/sys/fs/cgroup"); - - r = path_is_mount_point(p, AT_SYMLINK_FOLLOW); - if (r < 0) - return log_error_errno(r, "Failed to determine if %s is mounted already: %m", p); - if (r > 0) { - p = strjoina(dest, "/sys/fs/cgroup/cgroup.procs"); - if (access(p, F_OK) >= 0) - return 0; - if (errno != ENOENT) - return log_error_errno(errno, "Failed to determine if mount point %s contains the unified cgroup hierarchy: %m", p); - - log_error("%s is already mounted but not a unified cgroup hierarchy. Refusing.", p); - return -EINVAL; - } - - if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0) - return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p); - - return 0; -} - -static int mount_cgroups(const char *dest) { - if (arg_unified_cgroup_hierarchy) - return mount_unified_cgroups(dest); - else - return mount_legacy_cgroups(dest); -} - -static int mount_systemd_cgroup_writable(const char *dest) { - _cleanup_free_ char *own_cgroup_path = NULL; - const char *systemd_root, *systemd_own; - int r; - - assert(dest); - - r = cg_pid_get_path(NULL, 0, &own_cgroup_path); - if (r < 0) - return log_error_errno(r, "Failed to determine our own cgroup path: %m"); - - /* If we are living in the top-level, then there's nothing to do... */ - if (path_equal(own_cgroup_path, "/")) - return 0; - - if (arg_unified_cgroup_hierarchy) { - systemd_own = strjoina(dest, "/sys/fs/cgroup", own_cgroup_path); - systemd_root = prefix_roota(dest, "/sys/fs/cgroup"); - } else { - systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path); - systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd"); - } - - /* Make our own cgroup a (writable) bind mount */ - if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0) - return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path); - - /* And then remount the systemd cgroup root read-only */ - if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0) - return log_error_errno(errno, "Failed to mount cgroup root read-only: %m"); - - return 0; -} - static int userns_lchown(const char *p, uid_t uid, gid_t gid) { assert(p); @@ -1837,114 +1082,6 @@ static int setup_resolv_conf(const char *dest) { return 0; } -static int setup_volatile_state(const char *directory) { - _cleanup_free_ char *buf = NULL; - const char *p, *options; - int r; - - assert(directory); - - if (arg_volatile_mode != VOLATILE_STATE) - return 0; - - /* --volatile=state means we simply overmount /var - with a tmpfs, and the rest read-only. */ - - r = bind_remount_recursive(directory, true); - if (r < 0) - return log_error_errno(r, "Failed to remount %s read-only: %m", directory); - - p = prefix_roota(directory, "/var"); - r = mkdir(p, 0755); - if (r < 0 && errno != EEXIST) - return log_error_errno(errno, "Failed to create %s: %m", directory); - - options = "mode=755"; - r = tmpfs_patch_options(options, &buf); - if (r < 0) - return log_oom(); - if (r > 0) - options = buf; - - if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, options) < 0) - return log_error_errno(errno, "Failed to mount tmpfs to /var: %m"); - - return 0; -} - -static int setup_volatile(const char *directory) { - bool tmpfs_mounted = false, bind_mounted = false; - char template[] = "/tmp/nspawn-volatile-XXXXXX"; - _cleanup_free_ char *buf = NULL; - const char *f, *t, *options; - int r; - - assert(directory); - - if (arg_volatile_mode != VOLATILE_YES) - return 0; - - /* --volatile=yes means we mount a tmpfs to the root dir, and - the original /usr to use inside it, and that read-only. */ - - if (!mkdtemp(template)) - return log_error_errno(errno, "Failed to create temporary directory: %m"); - - options = "mode=755"; - r = tmpfs_patch_options(options, &buf); - if (r < 0) - return log_oom(); - if (r > 0) - options = buf; - - if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, options) < 0) { - r = log_error_errno(errno, "Failed to mount tmpfs for root directory: %m"); - goto fail; - } - - tmpfs_mounted = true; - - f = prefix_roota(directory, "/usr"); - t = prefix_roota(template, "/usr"); - - r = mkdir(t, 0755); - if (r < 0 && errno != EEXIST) { - r = log_error_errno(errno, "Failed to create %s: %m", t); - goto fail; - } - - if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) { - r = log_error_errno(errno, "Failed to create /usr bind mount: %m"); - goto fail; - } - - bind_mounted = true; - - r = bind_remount_recursive(t, true); - if (r < 0) { - log_error_errno(r, "Failed to remount %s read-only: %m", t); - goto fail; - } - - if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) { - r = log_error_errno(errno, "Failed to move root mount: %m"); - goto fail; - } - - (void) rmdir(template); - - return 0; - -fail: - if (bind_mounted) - (void) umount(t); - - if (tmpfs_mounted) - (void) umount(template); - (void) rmdir(template); - return r; -} - static char* id128_format_as_uuid(sd_id128_t id, char s[37]) { assert(s); @@ -2183,141 +1320,6 @@ static int setup_kmsg(const char *dest, int kmsg_socket) { return 0; } -static int send_rtnl(int send_fd) { - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int))]; - } control = {}; - struct msghdr mh = { - .msg_control = &control, - .msg_controllen = sizeof(control), - }; - struct cmsghdr *cmsg; - _cleanup_close_ int fd = -1; - ssize_t k; - - assert(send_fd >= 0); - - if (!arg_expose_ports) - return 0; - - fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE); - if (fd < 0) - return log_error_errno(errno, "Failed to allocate container netlink: %m"); - - cmsg = CMSG_FIRSTHDR(&mh); - cmsg->cmsg_level = SOL_SOCKET; - cmsg->cmsg_type = SCM_RIGHTS; - cmsg->cmsg_len = CMSG_LEN(sizeof(int)); - memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); - - mh.msg_controllen = cmsg->cmsg_len; - - /* Store away the fd in the socket, so that it stays open as - * long as we run the child */ - k = sendmsg(send_fd, &mh, MSG_NOSIGNAL); - if (k < 0) - return log_error_errno(errno, "Failed to send netlink fd: %m"); - - return 0; -} - -static int flush_ports(union in_addr_union *exposed) { - ExposePort *p; - int r, af = AF_INET; - - assert(exposed); - - if (!arg_expose_ports) - return 0; - - if (in_addr_is_null(af, exposed)) - return 0; - - log_debug("Lost IP address."); - - LIST_FOREACH(ports, p, arg_expose_ports) { - r = fw_add_local_dnat(false, - af, - p->protocol, - NULL, - NULL, 0, - NULL, 0, - p->host_port, - exposed, - p->container_port, - NULL); - if (r < 0) - log_warning_errno(r, "Failed to modify firewall: %m"); - } - - *exposed = IN_ADDR_NULL; - return 0; -} - -static int expose_ports(sd_netlink *rtnl, union in_addr_union *exposed) { - _cleanup_free_ struct local_address *addresses = NULL; - _cleanup_free_ char *pretty = NULL; - union in_addr_union new_exposed; - ExposePort *p; - bool add; - int af = AF_INET, r; - - assert(exposed); - - /* Invoked each time an address is added or removed inside the - * container */ - - if (!arg_expose_ports) - return 0; - - r = local_addresses(rtnl, 0, af, &addresses); - if (r < 0) - return log_error_errno(r, "Failed to enumerate local addresses: %m"); - - add = r > 0 && - addresses[0].family == af && - addresses[0].scope < RT_SCOPE_LINK; - - if (!add) - return flush_ports(exposed); - - new_exposed = addresses[0].address; - if (in_addr_equal(af, exposed, &new_exposed)) - return 0; - - in_addr_to_string(af, &new_exposed, &pretty); - log_debug("New container IP is %s.", strna(pretty)); - - LIST_FOREACH(ports, p, arg_expose_ports) { - - r = fw_add_local_dnat(true, - af, - p->protocol, - NULL, - NULL, 0, - NULL, 0, - p->host_port, - &new_exposed, - p->container_port, - in_addr_is_null(af, exposed) ? NULL : exposed); - if (r < 0) - log_warning_errno(r, "Failed to modify firewall: %m"); - } - - *exposed = new_exposed; - return 0; -} - -void expose_port_free_all(ExposePort *p) { - - while (p) { - ExposePort *q = p; - LIST_REMOVE(ports, p, q); - free(q); - } -} - static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { union in_addr_union *exposed = userdata; @@ -2325,62 +1327,7 @@ static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *user assert(m); assert(exposed); - expose_ports(rtnl, exposed); - return 0; -} - -static int watch_rtnl(sd_event *event, int recv_fd, union in_addr_union *exposed, sd_netlink **ret) { - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int))]; - } control = {}; - struct msghdr mh = { - .msg_control = &control, - .msg_controllen = sizeof(control), - }; - struct cmsghdr *cmsg; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - int fd, r; - ssize_t k; - - assert(event); - assert(recv_fd >= 0); - assert(ret); - - if (!arg_expose_ports) - return 0; - - k = recvmsg(recv_fd, &mh, MSG_NOSIGNAL); - if (k < 0) - return log_error_errno(errno, "Failed to recv netlink fd: %m"); - - cmsg = CMSG_FIRSTHDR(&mh); - assert(cmsg->cmsg_level == SOL_SOCKET); - assert(cmsg->cmsg_type == SCM_RIGHTS); - assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int))); - memcpy(&fd, CMSG_DATA(cmsg), sizeof(int)); - - r = sd_netlink_open_fd(&rtnl, fd); - if (r < 0) { - safe_close(fd); - return log_error_errno(r, "Failed to create rtnl object: %m"); - } - - r = sd_netlink_add_match(rtnl, RTM_NEWADDR, on_address_change, exposed); - if (r < 0) - return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m"); - - r = sd_netlink_add_match(rtnl, RTM_DELADDR, on_address_change, exposed); - if (r < 0) - return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m"); - - r = sd_netlink_attach_event(rtnl, event, 0); - if (r < 0) - return log_error_errno(r, "Failed to add to even loop: %m"); - - *ret = rtnl; - rtnl = NULL; - + expose_port_execute(rtnl, arg_expose_ports, exposed); return 0; } @@ -2557,220 +1504,6 @@ static int drop_capabilities(void) { return capability_bounding_set_drop(~arg_retain, false); } -static int register_machine(pid_t pid, int local_ifindex) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; - int r; - - if (!arg_register) - return 0; - - r = sd_bus_default_system(&bus); - if (r < 0) - return log_error_errno(r, "Failed to open system bus: %m"); - - if (arg_keep_unit) { - r = sd_bus_call_method( - bus, - "org.freedesktop.machine1", - "/org/freedesktop/machine1", - "org.freedesktop.machine1.Manager", - "RegisterMachineWithNetwork", - &error, - NULL, - "sayssusai", - arg_machine, - SD_BUS_MESSAGE_APPEND_ID128(arg_uuid), - "nspawn", - "container", - (uint32_t) pid, - strempty(arg_directory), - local_ifindex > 0 ? 1 : 0, local_ifindex); - } else { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - char **i; - unsigned j; - - r = sd_bus_message_new_method_call( - bus, - &m, - "org.freedesktop.machine1", - "/org/freedesktop/machine1", - "org.freedesktop.machine1.Manager", - "CreateMachineWithNetwork"); - if (r < 0) - return bus_log_create_error(r); - - r = sd_bus_message_append( - m, - "sayssusai", - arg_machine, - SD_BUS_MESSAGE_APPEND_ID128(arg_uuid), - "nspawn", - "container", - (uint32_t) pid, - strempty(arg_directory), - local_ifindex > 0 ? 1 : 0, local_ifindex); - if (r < 0) - return bus_log_create_error(r); - - r = sd_bus_message_open_container(m, 'a', "(sv)"); - if (r < 0) - return bus_log_create_error(r); - - if (!isempty(arg_slice)) { - r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice); - if (r < 0) - return bus_log_create_error(r); - } - - r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict"); - if (r < 0) - return bus_log_create_error(r); - - /* If you make changes here, also make sure to update - * systemd-nspawn@.service, to keep the device - * policies in sync regardless if we are run with or - * without the --keep-unit switch. */ - r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9, - /* Allow the container to - * access and create the API - * device nodes, so that - * PrivateDevices= in the - * container can work - * fine */ - "/dev/null", "rwm", - "/dev/zero", "rwm", - "/dev/full", "rwm", - "/dev/random", "rwm", - "/dev/urandom", "rwm", - "/dev/tty", "rwm", - "/dev/net/tun", "rwm", - /* Allow the container - * access to ptys. However, - * do not permit the - * container to ever create - * these device nodes. */ - "/dev/pts/ptmx", "rw", - "char-pts", "rw"); - if (r < 0) - return bus_log_create_error(r); - - for (j = 0; j < arg_n_custom_mounts; j++) { - CustomMount *cm = &arg_custom_mounts[j]; - - if (cm->type != CUSTOM_MOUNT_BIND) - continue; - - r = is_device_node(cm->source); - if (r < 0) - return log_error_errno(r, "Failed to stat %s: %m", cm->source); - - if (r) { - r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 1, - cm->source, cm->read_only ? "r" : "rw"); - if (r < 0) - return log_error_errno(r, "Failed to append message arguments: %m"); - } - } - - if (arg_kill_signal != 0) { - r = sd_bus_message_append(m, "(sv)", "KillSignal", "i", arg_kill_signal); - if (r < 0) - return bus_log_create_error(r); - - r = sd_bus_message_append(m, "(sv)", "KillMode", "s", "mixed"); - if (r < 0) - return bus_log_create_error(r); - } - - STRV_FOREACH(i, arg_property) { - r = sd_bus_message_open_container(m, 'r', "sv"); - if (r < 0) - return bus_log_create_error(r); - - r = bus_append_unit_property_assignment(m, *i); - if (r < 0) - return r; - - r = sd_bus_message_close_container(m); - if (r < 0) - return bus_log_create_error(r); - } - - r = sd_bus_message_close_container(m); - if (r < 0) - return bus_log_create_error(r); - - r = sd_bus_call(bus, m, 0, &error, NULL); - } - - if (r < 0) { - log_error("Failed to register machine: %s", bus_error_message(&error, r)); - return r; - } - - return 0; -} - -static int terminate_machine(pid_t pid) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; - const char *path; - int r; - - if (!arg_register) - return 0; - - /* If we are reusing the unit, then just exit, systemd will do - * the right thing when we exit. */ - if (arg_keep_unit) - return 0; - - r = sd_bus_default_system(&bus); - if (r < 0) - return log_error_errno(r, "Failed to open system bus: %m"); - - r = sd_bus_call_method( - bus, - "org.freedesktop.machine1", - "/org/freedesktop/machine1", - "org.freedesktop.machine1.Manager", - "GetMachineByPID", - &error, - &reply, - "u", - (uint32_t) pid); - if (r < 0) { - /* Note that the machine might already have been - * cleaned up automatically, hence don't consider it a - * failure if we cannot get the machine object. */ - log_debug("Failed to get machine: %s", bus_error_message(&error, r)); - return 0; - } - - r = sd_bus_message_read(reply, "o", &path); - if (r < 0) - return bus_log_parse_error(r); - - r = sd_bus_call_method( - bus, - "org.freedesktop.machine1", - path, - "org.freedesktop.machine1.Machine", - "Terminate", - &error, - NULL, - NULL); - if (r < 0) { - log_debug("Failed to terminate machine: %s", bus_error_message(&error, r)); - return 0; - } - - return 0; -} - static int reset_audit_loginuid(void) { _cleanup_free_ char *p = NULL; int r; @@ -2803,427 +1536,6 @@ static int reset_audit_loginuid(void) { return 0; } -#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) -#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2) -#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f) - -static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, uint64_t idx) { - uint8_t result[8]; - size_t l, sz; - uint8_t *v, *i; - int r; - - l = strlen(arg_machine); - sz = sizeof(sd_id128_t) + l; - if (idx > 0) - sz += sizeof(idx); - - v = alloca(sz); - - /* fetch some persistent data unique to the host */ - r = sd_id128_get_machine((sd_id128_t*) v); - if (r < 0) - return r; - - /* combine with some data unique (on this host) to this - * container instance */ - i = mempcpy(v + sizeof(sd_id128_t), arg_machine, l); - if (idx > 0) { - idx = htole64(idx); - memcpy(i, &idx, sizeof(idx)); - } - - /* Let's hash the host machine ID plus the container name. We - * use a fixed, but originally randomly created hash key here. */ - siphash24(result, v, sz, hash_key.bytes); - - assert_cc(ETH_ALEN <= sizeof(result)); - memcpy(mac->ether_addr_octet, result, ETH_ALEN); - - /* see eth_random_addr in the kernel */ - mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ - mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ - - return 0; -} - -static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - struct ether_addr mac_host, mac_container; - int r, i; - - if (!arg_private_network) - return 0; - - if (!arg_network_veth) - return 0; - - /* Use two different interface name prefixes depending whether - * we are in bridge mode or not. */ - snprintf(iface_name, IFNAMSIZ - 1, "%s-%s", - arg_network_bridge ? "vb" : "ve", arg_machine); - - r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0); - if (r < 0) - return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m"); - - r = generate_mac(&mac_host, HOST_HASH_KEY, 0); - if (r < 0) - return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m"); - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, iface_name); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name: %m"); - - r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host); - if (r < 0) - return log_error_errno(r, "Failed to add netlink MAC address: %m"); - - r = sd_netlink_message_open_container(m, IFLA_LINKINFO); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth"); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_open_container(m, VETH_INFO_PEER); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, "host0"); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name: %m"); - - r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container); - if (r < 0) - return log_error_errno(r, "Failed to add netlink MAC address: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); - if (r < 0) - return log_error_errno(r, "Failed to add netlink namespace field: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return log_error_errno(r, "Failed to add new veth interfaces (host0, %s): %m", iface_name); - - i = (int) if_nametoindex(iface_name); - if (i <= 0) - return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name); - - *ifi = i; - - return 0; -} - -static int setup_bridge(const char veth_name[], int *ifi) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - int r, bridge; - - if (!arg_private_network) - return 0; - - if (!arg_network_veth) - return 0; - - if (!arg_network_bridge) - return 0; - - bridge = (int) if_nametoindex(arg_network_bridge); - if (bridge <= 0) - return log_error_errno(errno, "Failed to resolve interface %s: %m", arg_network_bridge); - - *ifi = bridge; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); - if (r < 0) - return log_error_errno(r, "Failed to set IFF_UP flag: %m"); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name field: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge); - if (r < 0) - return log_error_errno(r, "Failed to add netlink master field: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return log_error_errno(r, "Failed to add veth interface to bridge: %m"); - - return 0; -} - -static int parse_interface(struct udev *udev, const char *name) { - _cleanup_udev_device_unref_ struct udev_device *d = NULL; - char ifi_str[2 + DECIMAL_STR_MAX(int)]; - int ifi; - - ifi = (int) if_nametoindex(name); - if (ifi <= 0) - return log_error_errno(errno, "Failed to resolve interface %s: %m", name); - - sprintf(ifi_str, "n%i", ifi); - d = udev_device_new_from_device_id(udev, ifi_str); - if (!d) - return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name); - - if (udev_device_get_is_initialized(d) <= 0) { - log_error("Network interface %s is not initialized yet.", name); - return -EBUSY; - } - - return ifi; -} - -static int move_network_interfaces(pid_t pid) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - char **i; - int r; - - if (!arg_private_network) - return 0; - - if (strv_isempty(arg_network_interfaces)) - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - udev = udev_new(); - if (!udev) { - log_error("Failed to connect to udev."); - return -ENOMEM; - } - - STRV_FOREACH(i, arg_network_interfaces) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - int ifi; - - ifi = parse_interface(udev, *i); - if (ifi < 0) - return ifi; - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); - if (r < 0) - return log_error_errno(r, "Failed to append namespace PID to netlink message: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i); - } - - return 0; -} - -static int setup_macvlan(pid_t pid) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - unsigned idx = 0; - char **i; - int r; - - if (!arg_private_network) - return 0; - - if (strv_isempty(arg_network_macvlan)) - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - udev = udev_new(); - if (!udev) { - log_error("Failed to connect to udev."); - return -ENOMEM; - } - - STRV_FOREACH(i, arg_network_macvlan) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - _cleanup_free_ char *n = NULL; - struct ether_addr mac; - int ifi; - - ifi = parse_interface(udev, *i); - if (ifi < 0) - return ifi; - - r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++); - if (r < 0) - return log_error_errno(r, "Failed to create MACVLAN MAC address: %m"); - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface index: %m"); - - n = strappend("mv-", *i); - if (!n) - return log_oom(); - - strshorten(n, IFNAMSIZ-1); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name: %m"); - - r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac); - if (r < 0) - return log_error_errno(r, "Failed to add netlink MAC address: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); - if (r < 0) - return log_error_errno(r, "Failed to add netlink namespace field: %m"); - - r = sd_netlink_message_open_container(m, IFLA_LINKINFO); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan"); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE); - if (r < 0) - return log_error_errno(r, "Failed to append macvlan mode: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return log_error_errno(r, "Failed to add new macvlan interfaces: %m"); - } - - return 0; -} - -static int setup_ipvlan(pid_t pid) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; - char **i; - int r; - - if (!arg_private_network) - return 0; - - if (strv_isempty(arg_network_ipvlan)) - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - udev = udev_new(); - if (!udev) { - log_error("Failed to connect to udev."); - return -ENOMEM; - } - - STRV_FOREACH(i, arg_network_ipvlan) { - _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; - _cleanup_free_ char *n = NULL; - int ifi; - - ifi = parse_interface(udev, *i); - if (ifi < 0) - return ifi; - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface index: %m"); - - n = strappend("iv-", *i); - if (!n) - return log_oom(); - - strshorten(n, IFNAMSIZ-1); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, n); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name: %m"); - - r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid); - if (r < 0) - return log_error_errno(r, "Failed to add netlink namespace field: %m"); - - r = sd_netlink_message_open_container(m, IFLA_LINKINFO); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan"); - if (r < 0) - return log_error_errno(r, "Failed to open netlink container: %m"); - - r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2); - if (r < 0) - return log_error_errno(r, "Failed to add ipvlan mode: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_message_close_container(m); - if (r < 0) - return log_error_errno(r, "Failed to close netlink container: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return log_error_errno(r, "Failed to add new ipvlan interfaces: %m"); - } - - return 0; -} - static int setup_seccomp(void) { #ifdef HAVE_SECCOMP @@ -3922,247 +2234,6 @@ static void loop_remove(int nr, int *image_fd) { log_debug_errno(errno, "Failed to remove loop %d: %m", nr); } -static int spawn_getent(const char *database, const char *key, pid_t *rpid) { - int pipe_fds[2]; - pid_t pid; - - assert(database); - assert(key); - assert(rpid); - - if (pipe2(pipe_fds, O_CLOEXEC) < 0) - return log_error_errno(errno, "Failed to allocate pipe: %m"); - - pid = fork(); - if (pid < 0) - return log_error_errno(errno, "Failed to fork getent child: %m"); - else if (pid == 0) { - int nullfd; - char *empty_env = NULL; - - if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0) - _exit(EXIT_FAILURE); - - if (pipe_fds[0] > 2) - safe_close(pipe_fds[0]); - if (pipe_fds[1] > 2) - safe_close(pipe_fds[1]); - - nullfd = open("/dev/null", O_RDWR); - if (nullfd < 0) - _exit(EXIT_FAILURE); - - if (dup3(nullfd, STDIN_FILENO, 0) < 0) - _exit(EXIT_FAILURE); - - if (dup3(nullfd, STDERR_FILENO, 0) < 0) - _exit(EXIT_FAILURE); - - if (nullfd > 2) - safe_close(nullfd); - - (void) reset_all_signal_handlers(); - (void) reset_signal_mask(); - close_all_fds(NULL, 0); - - execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env); - execle("/bin/getent", "getent", database, key, NULL, &empty_env); - _exit(EXIT_FAILURE); - } - - pipe_fds[1] = safe_close(pipe_fds[1]); - - *rpid = pid; - - return pipe_fds[0]; -} - -static int change_uid_gid(char **_home) { - char line[LINE_MAX], *x, *u, *g, *h; - const char *word, *state; - _cleanup_free_ uid_t *uids = NULL; - _cleanup_free_ char *home = NULL; - _cleanup_fclose_ FILE *f = NULL; - _cleanup_close_ int fd = -1; - unsigned n_uids = 0; - size_t sz = 0, l; - uid_t uid; - gid_t gid; - pid_t pid; - int r; - - assert(_home); - - if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) { - /* Reset everything fully to 0, just in case */ - - r = reset_uid_gid(); - if (r < 0) - return log_error_errno(r, "Failed to become root: %m"); - - *_home = NULL; - return 0; - } - - /* First, get user credentials */ - fd = spawn_getent("passwd", arg_user, &pid); - if (fd < 0) - return fd; - - f = fdopen(fd, "r"); - if (!f) - return log_oom(); - fd = -1; - - if (!fgets(line, sizeof(line), f)) { - - if (!ferror(f)) { - log_error("Failed to resolve user %s.", arg_user); - return -ESRCH; - } - - log_error_errno(errno, "Failed to read from getent: %m"); - return -errno; - } - - truncate_nl(line); - - wait_for_terminate_and_warn("getent passwd", pid, true); - - x = strchr(line, ':'); - if (!x) { - log_error("/etc/passwd entry has invalid user field."); - return -EIO; - } - - u = strchr(x+1, ':'); - if (!u) { - log_error("/etc/passwd entry has invalid password field."); - return -EIO; - } - - u++; - g = strchr(u, ':'); - if (!g) { - log_error("/etc/passwd entry has invalid UID field."); - return -EIO; - } - - *g = 0; - g++; - x = strchr(g, ':'); - if (!x) { - log_error("/etc/passwd entry has invalid GID field."); - return -EIO; - } - - *x = 0; - h = strchr(x+1, ':'); - if (!h) { - log_error("/etc/passwd entry has invalid GECOS field."); - return -EIO; - } - - h++; - x = strchr(h, ':'); - if (!x) { - log_error("/etc/passwd entry has invalid home directory field."); - return -EIO; - } - - *x = 0; - - r = parse_uid(u, &uid); - if (r < 0) { - log_error("Failed to parse UID of user."); - return -EIO; - } - - r = parse_gid(g, &gid); - if (r < 0) { - log_error("Failed to parse GID of user."); - return -EIO; - } - - home = strdup(h); - if (!home) - return log_oom(); - - /* Second, get group memberships */ - fd = spawn_getent("initgroups", arg_user, &pid); - if (fd < 0) - return fd; - - fclose(f); - f = fdopen(fd, "r"); - if (!f) - return log_oom(); - fd = -1; - - if (!fgets(line, sizeof(line), f)) { - if (!ferror(f)) { - log_error("Failed to resolve user %s.", arg_user); - return -ESRCH; - } - - log_error_errno(errno, "Failed to read from getent: %m"); - return -errno; - } - - truncate_nl(line); - - wait_for_terminate_and_warn("getent initgroups", pid, true); - - /* Skip over the username and subsequent separator whitespace */ - x = line; - x += strcspn(x, WHITESPACE); - x += strspn(x, WHITESPACE); - - FOREACH_WORD(word, l, x, state) { - char c[l+1]; - - memcpy(c, word, l); - c[l] = 0; - - if (!GREEDY_REALLOC(uids, sz, n_uids+1)) - return log_oom(); - - r = parse_uid(c, &uids[n_uids++]); - if (r < 0) { - log_error("Failed to parse group data from getent."); - return -EIO; - } - } - - r = mkdir_parents(home, 0775); - if (r < 0) - return log_error_errno(r, "Failed to make home root directory: %m"); - - r = mkdir_safe(home, 0755, uid, gid); - if (r < 0 && r != -EEXIST) - return log_error_errno(r, "Failed to make home directory: %m"); - - (void) fchown(STDIN_FILENO, uid, gid); - (void) fchown(STDOUT_FILENO, uid, gid); - (void) fchown(STDERR_FILENO, uid, gid); - - if (setgroups(n_uids, uids) < 0) - return log_error_errno(errno, "Failed to set auxiliary groups: %m"); - - if (setresgid(gid, gid, gid) < 0) - return log_error_errno(errno, "setregid() failed: %m"); - - if (setresuid(uid, uid, uid) < 0) - return log_error_errno(errno, "setreuid() failed: %m"); - - if (_home) { - *_home = home; - home = NULL; - } - - return 0; -} - /* * Return values: * < 0 : wait_for_terminate() failed to get the state of the @@ -4401,7 +2472,7 @@ static int inner_child( } } - r = mount_all(NULL, true); + r = mount_all(NULL, true, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context); if (r < 0) return r; @@ -4412,7 +2483,7 @@ static int inner_child( return -ESRCH; } - r = mount_systemd_cgroup_writable(""); + r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy); if (r < 0) return r; @@ -4437,10 +2508,12 @@ static int inner_child( if (arg_private_network) loopback_setup(); - r = send_rtnl(rtnl_socket); - if (r < 0) - return r; - rtnl_socket = safe_close(rtnl_socket); + if (arg_expose_ports) { + r = expose_port_send_rtnl(rtnl_socket); + if (r < 0) + return r; + rtnl_socket = safe_close(rtnl_socket); + } if (drop_capabilities() < 0) return log_error_errno(errno, "drop_capabilities() failed: %m"); @@ -4461,7 +2534,7 @@ static int inner_child( return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context); #endif - r = change_uid_gid(&home); + r = change_uid_gid(arg_user, &home); if (r < 0) return r; @@ -4632,11 +2705,11 @@ static int outer_child( if (mount(directory, directory, NULL, MS_BIND|MS_REC, NULL) < 0) return log_error_errno(errno, "Failed to make bind mount: %m"); - r = setup_volatile(directory); + r = setup_volatile(directory, arg_volatile_mode, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_context); if (r < 0) return r; - r = setup_volatile_state(directory); + r = setup_volatile_state(directory, arg_volatile_mode, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_context); if (r < 0) return r; @@ -4650,16 +2723,18 @@ static int outer_child( return log_error_errno(r, "Failed to make tree read-only: %m"); } - r = mount_all(directory, false); + r = mount_all(directory, false, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context); if (r < 0) return r; - if (copy_devnodes(directory) < 0) + r = copy_devnodes(directory); + if (r < 0) return r; dev_setup(directory, arg_uid_shift, arg_uid_shift); - if (setup_pts(directory) < 0) + r = setup_pts(directory); + if (r < 0) return r; r = setup_propagate(directory); @@ -4686,11 +2761,11 @@ static int outer_child( if (r < 0) return r; - r = mount_custom(directory); + r = mount_custom(directory, arg_custom_mounts, arg_n_custom_mounts, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context); if (r < 0) return r; - r = mount_cgroups(directory); + r = mount_cgroups(directory, arg_unified_cgroup_hierarchy, arg_userns, arg_uid_shift, arg_uid_range, arg_selinux_apifs_context); if (r < 0) return r; @@ -4754,141 +2829,6 @@ static int setup_uid_map(pid_t pid) { return 0; } -static int chown_cgroup(pid_t pid) { - _cleanup_free_ char *path = NULL, *fs = NULL; - _cleanup_close_ int fd = -1; - const char *fn; - int r; - - r = cg_pid_get_path(NULL, pid, &path); - if (r < 0) - return log_error_errno(r, "Failed to get container cgroup path: %m"); - - r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs); - if (r < 0) - return log_error_errno(r, "Failed to get file system path for container cgroup: %m"); - - fd = open(fs, O_RDONLY|O_CLOEXEC|O_DIRECTORY); - if (fd < 0) - return log_error_errno(errno, "Failed to open %s: %m", fs); - - FOREACH_STRING(fn, - ".", - "tasks", - "notify_on_release", - "cgroup.procs", - "cgroup.clone_children", - "cgroup.controllers", - "cgroup.subtree_control", - "cgroup.populated") - if (fchownat(fd, fn, arg_uid_shift, arg_uid_shift, 0) < 0) - log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, - "Failed to chown() cgroup file %s, ignoring: %m", fn); - - return 0; -} - -static int sync_cgroup(pid_t pid) { - _cleanup_free_ char *cgroup = NULL; - char tree[] = "/tmp/unifiedXXXXXX", pid_string[DECIMAL_STR_MAX(pid) + 1]; - bool undo_mount = false; - const char *fn; - int unified, r; - - unified = cg_unified(); - if (unified < 0) - return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m"); - - if ((unified > 0) == arg_unified_cgroup_hierarchy) - return 0; - - /* When the host uses the legacy cgroup setup, but the - * container shall use the unified hierarchy, let's make sure - * we copy the path from the name=systemd hierarchy into the - * unified hierarchy. Similar for the reverse situation. */ - - r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); - if (r < 0) - return log_error_errno(r, "Failed to get control group of " PID_FMT ": %m", pid); - - /* In order to access the unified hierarchy we need to mount it */ - if (!mkdtemp(tree)) - return log_error_errno(errno, "Failed to generate temporary mount point for unified hierarchy: %m"); - - if (unified) - r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "none,name=systemd,xattr"); - else - r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior"); - if (r < 0) { - r = log_error_errno(errno, "Failed to mount unified hierarchy: %m"); - goto finish; - } - - undo_mount = true; - - fn = strjoina(tree, cgroup, "/cgroup.procs"); - (void) mkdir_parents(fn, 0755); - - sprintf(pid_string, PID_FMT, pid); - r = write_string_file(fn, pid_string, 0); - if (r < 0) - log_error_errno(r, "Failed to move process: %m"); - -finish: - if (undo_mount) - (void) umount(tree); - - (void) rmdir(tree); - return r; -} - -static int create_subcgroup(pid_t pid) { - _cleanup_free_ char *cgroup = NULL; - const char *child; - int unified, r; - CGroupMask supported; - - /* In the unified hierarchy inner nodes may only only contain - * subgroups, but not processes. Hence, if we running in the - * unified hierarchy and the container does the same, and we - * did not create a scope unit for the container move us and - * the container into two separate subcgroups. */ - - if (!arg_keep_unit) - return 0; - - if (!arg_unified_cgroup_hierarchy) - return 0; - - unified = cg_unified(); - if (unified < 0) - return log_error_errno(unified, "Failed to determine whether the unified hierachy is used: %m"); - if (unified == 0) - return 0; - - r = cg_mask_supported(&supported); - if (r < 0) - return log_error_errno(r, "Failed to determine supported controllers: %m"); - - r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); - if (r < 0) - return log_error_errno(r, "Failed to get our control group: %m"); - - child = strjoina(cgroup, "/payload"); - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, pid); - if (r < 0) - return log_error_errno(r, "Failed to create %s subcgroup: %m", child); - - child = strjoina(cgroup, "/supervisor"); - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, child, 0); - if (r < 0) - return log_error_errno(r, "Failed to create %s subcgroup: %m", child); - - /* Try to enable as many controllers as possible for the new payload. */ - (void) cg_enable_everywhere(supported, supported, cgroup); - return 0; -} - static int load_settings(void) { _cleanup_(settings_freep) Settings *settings = NULL; _cleanup_fclose_ FILE *f = NULL; @@ -5332,23 +3272,23 @@ int main(int argc, char *argv[]) { goto finish; } - if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) { + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) { r = log_error_errno(errno, "Failed to create kmsg socket pair: %m"); goto finish; } - if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) { + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) { r = log_error_errno(errno, "Failed to create rtnl socket pair: %m"); goto finish; } - if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, pid_socket_pair) < 0) { + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0) { r = log_error_errno(errno, "Failed to create pid socket pair: %m"); goto finish; } if (arg_userns) - if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0) { + if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0) { r = log_error_errno(errno, "Failed to create uid shift socket pair: %m"); goto finish; } @@ -5419,6 +3359,7 @@ int main(int argc, char *argv[]) { kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]); rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]); pid_socket_pair[1] = safe_close(pid_socket_pair[1]); + uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]); /* Wait for the outer child. */ r = wait_for_terminate_and_warn("namespace helper", pid, NULL); @@ -5437,7 +3378,7 @@ int main(int argc, char *argv[]) { goto finish; } if (l != sizeof(pid)) { - log_error("Short read while reading inner child PID: %m"); + log_error("Short read while reading inner child PID."); r = EIO; goto finish; } @@ -5457,7 +3398,7 @@ int main(int argc, char *argv[]) { goto finish; } if (l != sizeof(arg_uid_shift)) { - log_error("Short read while reading UID shift: %m"); + log_error("Short read while reading UID shift."); r = EIO; goto finish; } @@ -5469,39 +3410,64 @@ int main(int argc, char *argv[]) { (void) barrier_place(&barrier); /* #2 */ } - r = move_network_interfaces(pid); - if (r < 0) - goto finish; + if (arg_private_network) { - r = setup_veth(pid, veth_name, &ifi); - if (r < 0) - goto finish; + r = move_network_interfaces(pid, arg_network_interfaces); + if (r < 0) + goto finish; - r = setup_bridge(veth_name, &ifi); - if (r < 0) - goto finish; + if (arg_network_veth) { + r = setup_veth(arg_machine, pid, veth_name, !!arg_network_bridge); + if (r < 0) + goto finish; + else if (r > 0) + ifi = r; - r = setup_macvlan(pid); - if (r < 0) - goto finish; + if (arg_network_bridge) { + r = setup_bridge(veth_name, arg_network_bridge); + if (r < 0) + goto finish; + if (r > 0) + ifi = r; + } + } - r = setup_ipvlan(pid); - if (r < 0) - goto finish; + r = setup_macvlan(arg_machine, pid, arg_network_macvlan); + if (r < 0) + goto finish; - r = register_machine(pid, ifi); - if (r < 0) - goto finish; + r = setup_ipvlan(arg_machine, pid, arg_network_ipvlan); + if (r < 0) + goto finish; + } - r = sync_cgroup(pid); - if (r < 0) - goto finish; + if (arg_register) { + r = register_machine( + arg_machine, + pid, + arg_directory, + arg_uuid, + ifi, + arg_slice, + arg_custom_mounts, arg_n_custom_mounts, + arg_kill_signal, + arg_property, + arg_keep_unit); + if (r < 0) + goto finish; + } - r = create_subcgroup(pid); + r = sync_cgroup(pid, arg_unified_cgroup_hierarchy); if (r < 0) goto finish; - r = chown_cgroup(pid); + if (arg_keep_unit) { + r = create_subcgroup(pid, arg_unified_cgroup_hierarchy); + if (r < 0) + goto finish; + } + + r = chown_cgroup(pid, arg_uid_shift); if (r < 0) goto finish; @@ -5554,11 +3520,11 @@ int main(int argc, char *argv[]) { sd_event_add_signal(event, NULL, SIGCHLD, NULL, NULL); if (arg_expose_ports) { - r = watch_rtnl(event, rtnl_socket_pair[0], &exposed, &rtnl); + r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, &exposed, &rtnl); if (r < 0) goto finish; - (void) expose_ports(rtnl, &exposed); + (void) expose_port_execute(rtnl, arg_expose_ports, &exposed); } rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]); @@ -5583,7 +3549,8 @@ int main(int argc, char *argv[]) { putc('\n', stdout); /* Kill if it is not dead yet anyway */ - terminate_machine(pid); + if (arg_register && !arg_keep_unit) + terminate_machine(pid); /* Normally redundant, but better safe than sorry */ kill(pid, SIGKILL); @@ -5621,7 +3588,7 @@ int main(int argc, char *argv[]) { break; } - flush_ports(&exposed); + expose_port_flush(arg_expose_ports, &exposed); } finish: @@ -5653,7 +3620,7 @@ finish: (void) rm_rf(p, REMOVE_ROOT); } - flush_ports(&exposed); + expose_port_flush(arg_expose_ports, &exposed); free(arg_directory); free(arg_template); |