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-rw-r--r--src/systemd-nspawn/nspawn-settings.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/src/systemd-nspawn/nspawn-settings.c b/src/systemd-nspawn/nspawn-settings.c
new file mode 100644
index 0000000000..6c1614b276
--- /dev/null
+++ b/src/systemd-nspawn/nspawn-settings.c
@@ -0,0 +1,515 @@
+/***
+ 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 "systemd-basic/alloc-util.h"
+#include "systemd-basic/cap-list.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/socket-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-shared/conf-parser.h"
+
+#include "nspawn-network.h"
+#include "nspawn-settings.h"
+
+int settings_load(FILE *f, const char *path, Settings **ret) {
+ _cleanup_(settings_freep) Settings *s = NULL;
+ int r;
+
+ assert(path);
+ assert(ret);
+
+ s = new0(Settings, 1);
+ if (!s)
+ return -ENOMEM;
+
+ s->start_mode = _START_MODE_INVALID;
+ s->personality = PERSONALITY_INVALID;
+ s->userns_mode = _USER_NAMESPACE_MODE_INVALID;
+ s->uid_shift = UID_INVALID;
+ s->uid_range = UID_INVALID;
+
+ s->read_only = -1;
+ s->volatile_mode = _VOLATILE_MODE_INVALID;
+ s->userns_chown = -1;
+
+ s->private_network = -1;
+ s->network_veth = -1;
+
+ r = config_parse(NULL, path, f,
+ "Exec\0"
+ "Network\0"
+ "Files\0",
+ config_item_perf_lookup, nspawn_gperf_lookup,
+ false,
+ false,
+ true,
+ s);
+ if (r < 0)
+ return r;
+
+ /* Make sure that if userns_mode is set, userns_chown is set to something appropriate, and vice versa. Either
+ * both fields shall be initialized or neither. */
+ if (s->userns_mode == USER_NAMESPACE_PICK)
+ s->userns_chown = true;
+ else if (s->userns_mode != _USER_NAMESPACE_MODE_INVALID && s->userns_chown < 0)
+ s->userns_chown = false;
+
+ if (s->userns_chown >= 0 && s->userns_mode == _USER_NAMESPACE_MODE_INVALID)
+ s->userns_mode = USER_NAMESPACE_NO;
+
+ *ret = s;
+ s = NULL;
+
+ return 0;
+}
+
+Settings* settings_free(Settings *s) {
+
+ if (!s)
+ return NULL;
+
+ strv_free(s->parameters);
+ strv_free(s->environment);
+ free(s->user);
+ free(s->working_directory);
+
+ strv_free(s->network_interfaces);
+ strv_free(s->network_macvlan);
+ strv_free(s->network_ipvlan);
+ strv_free(s->network_veth_extra);
+ free(s->network_bridge);
+ free(s->network_zone);
+ expose_port_free_all(s->expose_ports);
+
+ custom_mount_free_all(s->custom_mounts, s->n_custom_mounts);
+ return mfree(s);
+}
+
+bool settings_private_network(Settings *s) {
+ assert(s);
+
+ return
+ s->private_network > 0 ||
+ s->network_veth > 0 ||
+ s->network_bridge ||
+ s->network_zone ||
+ s->network_interfaces ||
+ s->network_macvlan ||
+ s->network_ipvlan ||
+ s->network_veth_extra;
+}
+
+bool settings_network_veth(Settings *s) {
+ assert(s);
+
+ return
+ s->network_veth > 0 ||
+ s->network_bridge ||
+ s->network_zone;
+}
+
+DEFINE_CONFIG_PARSE_ENUM(config_parse_volatile_mode, volatile_mode, VolatileMode, "Failed to parse volatile mode");
+
+int config_parse_expose_port(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *s = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = expose_port_parse(&s->expose_ports, rvalue);
+ if (r == -EEXIST) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Duplicate port specification, ignoring: %s", rvalue);
+ return 0;
+ }
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse host port %s: %m", rvalue);
+ return 0;
+ }
+
+ return 0;
+}
+
+int config_parse_capability(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ uint64_t u = 0, *result = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ int cap;
+
+ r = extract_first_word(&rvalue, &word, NULL, 0);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract capability string, ignoring: %s", rvalue);
+ return 0;
+ }
+ if (r == 0)
+ break;
+
+ cap = capability_from_name(word);
+ if (cap < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse capability, ignoring: %s", word);
+ continue;
+ }
+
+ u |= 1 << ((uint64_t) cap);
+ }
+
+ if (u == 0)
+ return 0;
+
+ *result |= u;
+ return 0;
+}
+
+int config_parse_id128(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ sd_id128_t t, *result = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = sd_id128_from_string(rvalue, &t);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse 128bit ID/UUID, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ *result = t;
+ return 0;
+}
+
+int config_parse_bind(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = bind_mount_parse(&settings->custom_mounts, &settings->n_custom_mounts, rvalue, ltype);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Invalid bind mount specification %s: %m", rvalue);
+ return 0;
+ }
+
+ return 0;
+}
+
+int config_parse_tmpfs(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = tmpfs_mount_parse(&settings->custom_mounts, &settings->n_custom_mounts, rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Invalid temporary file system specification %s: %m", rvalue);
+ return 0;
+ }
+
+ return 0;
+}
+
+int config_parse_veth_extra(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = veth_extra_parse(&settings->network_veth_extra, rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Invalid extra virtual Ethernet link specification %s: %m", rvalue);
+ return 0;
+ }
+
+ return 0;
+}
+
+int config_parse_network_zone(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ _cleanup_free_ char *j = NULL;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ j = strappend("vz-", rvalue);
+ if (!ifname_valid(j)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid network zone name %s, ignoring: %m", rvalue);
+ return 0;
+ }
+
+ free(settings->network_zone);
+ settings->network_zone = j;
+ j = NULL;
+
+ return 0;
+}
+
+int config_parse_boot(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = parse_boolean(rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Boot= parameter %s, ignoring: %m", rvalue);
+ return 0;
+ }
+
+ if (r > 0) {
+ if (settings->start_mode == START_PID2)
+ goto conflict;
+
+ settings->start_mode = START_BOOT;
+ } else {
+ if (settings->start_mode == START_BOOT)
+ goto conflict;
+
+ if (settings->start_mode < 0)
+ settings->start_mode = START_PID1;
+ }
+
+ return 0;
+
+conflict:
+ log_syntax(unit, LOG_ERR, filename, line, r, "Conflicting Boot= or ProcessTwo= setting found. Ignoring.");
+ return 0;
+}
+
+int config_parse_pid2(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = parse_boolean(rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse ProcessTwo= parameter %s, ignoring: %m", rvalue);
+ return 0;
+ }
+
+ if (r > 0) {
+ if (settings->start_mode == START_BOOT)
+ goto conflict;
+
+ settings->start_mode = START_PID2;
+ } else {
+ if (settings->start_mode == START_PID2)
+ goto conflict;
+
+ if (settings->start_mode < 0)
+ settings->start_mode = START_PID1;
+ }
+
+ return 0;
+
+conflict:
+ log_syntax(unit, LOG_ERR, filename, line, r, "Conflicting Boot= or ProcessTwo= setting found. Ignoring.");
+ return 0;
+}
+
+int config_parse_private_users(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ Settings *settings = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = parse_boolean(rvalue);
+ if (r == 0) {
+ /* no: User namespacing off */
+ settings->userns_mode = USER_NAMESPACE_NO;
+ settings->uid_shift = UID_INVALID;
+ settings->uid_range = UINT32_C(0x10000);
+ } else if (r > 0) {
+ /* yes: User namespacing on, UID range is read from root dir */
+ settings->userns_mode = USER_NAMESPACE_FIXED;
+ settings->uid_shift = UID_INVALID;
+ settings->uid_range = UINT32_C(0x10000);
+ } else if (streq(rvalue, "pick")) {
+ /* pick: User namespacing on, UID range is picked randomly */
+ settings->userns_mode = USER_NAMESPACE_PICK;
+ settings->uid_shift = UID_INVALID;
+ settings->uid_range = UINT32_C(0x10000);
+ } else {
+ const char *range, *shift;
+ uid_t sh, rn;
+
+ /* anything else: User namespacing on, UID range is explicitly configured */
+
+ range = strchr(rvalue, ':');
+ if (range) {
+ shift = strndupa(rvalue, range - rvalue);
+ range++;
+
+ r = safe_atou32(range, &rn);
+ if (r < 0 || rn <= 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "UID/GID range invalid, ignoring: %s", range);
+ return 0;
+ }
+ } else {
+ shift = rvalue;
+ rn = UINT32_C(0x10000);
+ }
+
+ r = parse_uid(shift, &sh);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "UID/GID shift invalid, ignoring: %s", range);
+ return 0;
+ }
+
+ settings->userns_mode = USER_NAMESPACE_FIXED;
+ settings->uid_shift = sh;
+ settings->uid_range = rn;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:31:37 +0000