if ((fd = open(fn, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_CREAT, 0600)) < 0)
return -errno;
+ /* The BSD socket semantics are a lot nicer than those of
+ * POSIX locks. Which is why we use flock() here. BSD locking
+ * does not work across NFS which however is not needed here
+ * as the filesystems in question should be local, and only
+ * locally accessible, and most likely even tmpfs. */
+
if (flock(fd, LOCK_EX) < 0)
return -errno;
return fd;
}
-static uint64_t get_session_id(void) {
+enum {
+ SESSION_ID_AUDIT = 'a',
+ SESSION_ID_COUNTER = 'c',
+ SESSION_ID_RANDOM = 'r'
+};
+
+static uint64_t get_session_id(int *mode) {
char *s;
int fd;
+ assert(mode);
+
/* First attempt: let's use the session ID of the audit
* system, if it is available. */
if (read_one_line_file("/proc/self/sessionid", &s) >= 0) {
r = safe_atou32(s, &u);
free(s);
- if (r >= 0 && u != (uint32_t) -1)
+ if (r >= 0 && u != (uint32_t) -1) {
+ *mode = SESSION_ID_AUDIT;
return (uint64_t) u;
+ }
}
/* Second attempt, use our own counter. */
close_nointr_nofail(fd);
- if (r >= 0)
+ if (r >= 0) {
+ *mode = SESSION_ID_COUNTER;
return counter;
+ }
}
+ *mode = SESSION_ID_RANDOM;
+
/* Last attempt, pick a random value */
return (uint64_t) random_ull();
}
assert(group);
if (attach)
- r = cg_create_and_attach("name=systemd", group, 0);
+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, group, 0);
else
- r = cg_create("name=systemd", group);
+ r = cg_create(SYSTEMD_CGROUP_CONTROLLER, group);
if (r < 0) {
pam_syslog(handle, LOG_ERR, "Failed to create cgroup: %s", strerror(-r));
return PAM_SESSION_ERR;
}
- if ((r = cg_set_task_access("name=systemd", group, 0755, pw->pw_uid, pw->pw_gid)) < 0 ||
- (r = cg_set_group_access("name=systemd", group, 0755, pw->pw_uid, pw->pw_gid)) < 0) {
+ if ((r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0 ||
+ (r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0) {
pam_syslog(handle, LOG_ERR, "Failed to change access modes: %s", strerror(-r));
return PAM_SESSION_ERR;
}
if (sd_booted() <= 0)
return PAM_SUCCESS;
- if ((r = cgroup_init()) != 0) {
- pam_syslog(handle, LOG_ERR, "libcgroup initialization failed: %s", cgroup_strerror(r));
+ if ((r = cg_init()) < 0) {
+ pam_syslog(handle, LOG_ERR, "libcgroup initialization failed: %s", strerror(-r));
r = PAM_SESSION_ERR;
goto finish;
}
/* Reuse or create XDG session ID */
if (!(id = pam_getenv(handle, "XDG_SESSION_ID"))) {
+ int mode;
- if (asprintf(&buf, "%llu", (unsigned long long) get_session_id()) < 0) {
+ if (asprintf(&buf, "%llux", (unsigned long long) get_session_id(&mode)) < 0) {
r = PAM_BUF_ERR;
goto finish;
}
+ /* To avoid id clashes we add the session id
+ * source to our session ids. Note that the
+ * session id source might change during
+ * runtime, because a filesystem became
+ * writable or the system reconfigured. */
+ buf[strlen(buf)-1] =
+ mode != SESSION_ID_AUDIT ? (char) mode : 0;
+
if ((r = pam_misc_setenv(handle, "XDG_SESSION_ID", buf, 0)) != PAM_SUCCESS) {
pam_syslog(handle, LOG_ERR, "Failed to set session id.");
goto finish;
zero(info);
- r = cgroup_walk_tree_begin("name=systemd", user_path, 0, &iterator, &info, &level);
+ r = cgroup_walk_tree_begin(SYSTEMD_CGROUP_CONTROLLER, user_path, 0, &iterator, &info, &level);
while (r == 0) {
if (info.type != CGROUP_FILE_TYPE_DIR)
if (kill_session) {
/* Kill processes in session cgroup */
- if ((r = cg_kill_recursive_and_wait("name=systemd", session_path)) < 0)
+ if ((r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, session_path)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to kill session cgroup: %s", strerror(-r));
} else {
* yet. */
create_user_group(handle, nosession_path, pw, 0);
- if ((r = cg_migrate_recursive("name=systemd", session_path, nosession_path, false)) < 0)
+ if ((r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, session_path, nosession_path, false)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to migrate session cgroup: %s", strerror(-r));
}
if (r < 0)
pam_syslog(handle, LOG_INFO, "Couldn't empty session cgroup, not deleting.");
else {
- if ((r = cg_delete("name=systemd", session_path)) < 0)
+ if ((r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, session_path)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to delete session cgroup: %s", strerror(-r));
}
}
/* GC user tree */
- cg_trim("name=systemd", user_path, false);
+ cg_trim(SYSTEMD_CGROUP_CONTROLLER, user_path, false);
if ((r = session_remains(handle, user_path)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to determine whether a session remains: %s", strerror(-r));
if (kill_user && r == 0) {
/* Kill no-session cgroup */
- if ((r = cg_kill_recursive_and_wait("name=systemd", user_path)) < 0)
+ if ((r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, user_path)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to kill user cgroup: %s", strerror(-r));
} else {
- if ((r = cg_is_empty_recursive("name=systemd", user_path, true)) < 0)
+ if ((r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, user_path, true)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to check user cgroup: %s", strerror(-r));
/* If we managed to kill somebody, don't cleanup the cgroup. */
const char *runtime_dir;
/* Remove user cgroup */
- if ((r = cg_delete("name=systemd", user_path)) < 0)
+ if ((r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, user_path)) < 0)
pam_syslog(handle, LOG_ERR, "Failed to delete user cgroup: %s", strerror(-r));
/* This will migrate us to the /user cgroup. */
~ianmdlvl / elogind.git / blobdiff