From d7832d2c6e0ef5f2839a2296c1cc2fc85c7d9632 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Tue, 10 Apr 2012 13:39:02 +0200 Subject: util: move all to shared/ and split external dependencies in separate internal libraries Before: $ ldd /lib/systemd/systemd-timestamp linux-vdso.so.1 => (0x00007fffb05ff000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f90aac57000) libcap.so.2 => /lib64/libcap.so.2 (0x00007f90aaa53000) librt.so.1 => /lib64/librt.so.1 (0x00007f90aa84a000) libc.so.6 => /lib64/libc.so.6 (0x00007f90aa494000) /lib64/ld-linux-x86-64.so.2 (0x00007f90aae90000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f90aa290000) libattr.so.1 => /lib64/libattr.so.1 (0x00007f90aa08a000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f90a9e6e000) After: $ ldd systemd-timestamp linux-vdso.so.1 => (0x00007fff3cbff000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5eaa1c3000) librt.so.1 => /lib64/librt.so.1 (0x00007f5ea9fbb000) libc.so.6 => /lib64/libc.so.6 (0x00007f5ea9c04000) /lib64/ld-linux-x86-64.so.2 (0x00007f5eaa3fc000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f5ea9a00000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5ea97e4000) --- src/shared/label.c | 413 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 413 insertions(+) create mode 100644 src/shared/label.c (limited to 'src/shared/label.c') diff --git a/src/shared/label.c b/src/shared/label.c new file mode 100644 index 0000000000..2c887a0fe5 --- /dev/null +++ b/src/shared/label.c @@ -0,0 +1,413 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with systemd; If not, see . +***/ + +#include +#include +#include +#include +#include +#include + +#include "label.h" +#include "util.h" + +#ifdef HAVE_SELINUX +#include +#include + +static struct selabel_handle *label_hnd = NULL; + +static int use_selinux_cached = -1; + +static inline bool use_selinux(void) { + + if (use_selinux_cached < 0) + use_selinux_cached = is_selinux_enabled() > 0; + + return use_selinux_cached; +} + +void label_retest_selinux(void) { + use_selinux_cached = -1; +} + +#endif + +int label_init(void) { + int r = 0; + +#ifdef HAVE_SELINUX + usec_t before_timestamp, after_timestamp; + struct mallinfo before_mallinfo, after_mallinfo; + + if (!use_selinux()) + return 0; + + if (label_hnd) + return 0; + + before_mallinfo = mallinfo(); + before_timestamp = now(CLOCK_MONOTONIC); + + label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); + if (!label_hnd) { + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Failed to initialize SELinux context: %m"); + r = security_getenforce() == 1 ? -errno : 0; + } else { + char timespan[FORMAT_TIMESPAN_MAX]; + int l; + + after_timestamp = now(CLOCK_MONOTONIC); + after_mallinfo = mallinfo(); + + l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0; + + log_info("Successfully loaded SELinux database in %s, size on heap is %iK.", + format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp), + (l+1023)/1024); + } +#endif + + return r; +} + +int label_fix(const char *path, bool ignore_enoent) { + int r = 0; + +#ifdef HAVE_SELINUX + struct stat st; + security_context_t fcon; + + if (!use_selinux() || !label_hnd) + return 0; + + r = lstat(path, &st); + if (r == 0) { + r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode); + + /* If there's no label to set, then exit without warning */ + if (r < 0 && errno == ENOENT) + return 0; + + if (r == 0) { + r = lsetfilecon(path, fcon); + freecon(fcon); + + /* If the FS doesn't support labels, then exit without warning */ + if (r < 0 && errno == ENOTSUP) + return 0; + } + } + + if (r < 0) { + /* Ignore ENOENT in some cases */ + if (ignore_enoent && errno == ENOENT) + return 0; + + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Unable to fix label of %s: %m", path); + r = security_getenforce() == 1 ? -errno : 0; + } +#endif + + return r; +} + +void label_finish(void) { + +#ifdef HAVE_SELINUX + if (use_selinux() && label_hnd) + selabel_close(label_hnd); +#endif +} + +int label_get_create_label_from_exe(const char *exe, char **label) { + + int r = 0; + +#ifdef HAVE_SELINUX + security_context_t mycon = NULL, fcon = NULL; + security_class_t sclass; + + if (!use_selinux()) { + *label = NULL; + return 0; + } + + r = getcon(&mycon); + if (r < 0) + goto fail; + + r = getfilecon(exe, &fcon); + if (r < 0) + goto fail; + + sclass = string_to_security_class("process"); + r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label); + if (r == 0) + log_debug("SELinux Socket context for %s will be set to %s", exe, *label); + +fail: + if (r < 0 && security_getenforce() == 1) + r = -errno; + + freecon(mycon); + freecon(fcon); +#endif + + return r; +} + +int label_fifofile_set(const char *path) { + int r = 0; + +#ifdef HAVE_SELINUX + security_context_t filecon = NULL; + + if (!use_selinux() || !label_hnd) + return 0; + + r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO); + if (r < 0) + r = -errno; + else if (r == 0) { + r = setfscreatecon(filecon); + if (r < 0) { + log_error("Failed to set SELinux file context on %s: %m", path); + r = -errno; + } + + freecon(filecon); + } + + if (r < 0 && security_getenforce() == 0) + r = 0; +#endif + + return r; +} + +int label_symlinkfile_set(const char *path) { + int r = 0; + +#ifdef HAVE_SELINUX + security_context_t filecon = NULL; + + if (!use_selinux() || !label_hnd) + return 0; + + r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK); + if (r < 0) + r = -errno; + else if (r == 0) { + r = setfscreatecon(filecon); + if (r < 0) { + log_error("Failed to set SELinux file context on %s: %m", path); + r = -errno; + } + + freecon(filecon); + } + + if (r < 0 && security_getenforce() == 0) + r = 0; +#endif + + return r; +} + +int label_socket_set(const char *label) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return 0; + + if (setsockcreatecon((security_context_t) label) < 0) { + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Failed to set SELinux context (%s) on socket: %m", label); + + if (security_getenforce() == 1) + return -errno; + } +#endif + + return 0; +} + +void label_file_clear(void) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return; + + setfscreatecon(NULL); +#endif +} + +void label_socket_clear(void) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return; + + setsockcreatecon(NULL); +#endif +} + +void label_free(const char *label) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return; + + freecon((security_context_t) label); +#endif +} + +int label_mkdir(const char *path, mode_t mode) { + + /* Creates a directory and labels it according to the SELinux policy */ + +#ifdef HAVE_SELINUX + int r; + security_context_t fcon = NULL; + + if (!use_selinux() || !label_hnd) + goto skipped; + + if (path_is_absolute(path)) + r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR); + else { + char *newpath; + + newpath = path_make_absolute_cwd(path); + if (!newpath) + return -ENOMEM; + + r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR); + free(newpath); + } + + if (r == 0) + r = setfscreatecon(fcon); + + if (r < 0 && errno != ENOENT) { + log_error("Failed to set security context %s for %s: %m", fcon, path); + + if (security_getenforce() == 1) { + r = -errno; + goto finish; + } + } + + r = mkdir(path, mode); + if (r < 0) + r = -errno; + +finish: + setfscreatecon(NULL); + freecon(fcon); + + return r; + +skipped: +#endif + return mkdir(path, mode) < 0 ? -errno : 0; +} + +int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { + + /* Binds a socket and label its file system object according to the SELinux policy */ + +#ifdef HAVE_SELINUX + int r; + security_context_t fcon = NULL; + const struct sockaddr_un *un; + char *path = NULL; + + assert(fd >= 0); + assert(addr); + assert(addrlen >= sizeof(sa_family_t)); + + if (!use_selinux() || !label_hnd) + goto skipped; + + /* Filter out non-local sockets */ + if (addr->sa_family != AF_UNIX) + goto skipped; + + /* Filter out anonymous sockets */ + if (addrlen < sizeof(sa_family_t) + 1) + goto skipped; + + /* Filter out abstract namespace sockets */ + un = (const struct sockaddr_un*) addr; + if (un->sun_path[0] == 0) + goto skipped; + + path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); + if (!path) + return -ENOMEM; + + if (path_is_absolute(path)) + r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); + else { + char *newpath; + + newpath = path_make_absolute_cwd(path); + + if (!newpath) { + free(path); + return -ENOMEM; + } + + r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); + free(newpath); + } + + if (r == 0) + r = setfscreatecon(fcon); + + if (r < 0 && errno != ENOENT) { + log_error("Failed to set security context %s for %s: %m", fcon, path); + + if (security_getenforce() == 1) { + r = -errno; + goto finish; + } + } + + r = bind(fd, addr, addrlen); + if (r < 0) + r = -errno; + +finish: + setfscreatecon(NULL); + freecon(fcon); + free(path); + + return r; + +skipped: +#endif + return bind(fd, addr, addrlen) < 0 ? -errno : 0; +} -- cgit v1.2.3-54-g00ecf