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pam: remove only sessions we ourselves created in the first place
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parent
294d81f124
commit
672c48cc06
@ -25,6 +25,8 @@
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "cgroup-util.h"
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#include "log.h"
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@ -546,7 +548,17 @@ int cg_create(const char *controller, const char *path) {
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if ((r = cg_get_path(controller, path, NULL, &fs)) < 0)
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return r;
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r = mkdir_p(fs, 0755);
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r = mkdir_parents(fs, 0755);
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if (r >= 0) {
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if (mkdir(fs, 0755) >= 0)
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r = 1;
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else if (errno == EEXIST)
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r = 0;
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else
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r = -errno;
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}
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free(fs);
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return r;
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@ -577,7 +589,7 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
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}
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int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
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int r;
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int r, q;
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assert(controller);
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assert(path);
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@ -586,8 +598,8 @@ int cg_create_and_attach(const char *controller, const char *path, pid_t pid) {
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if ((r = cg_create(controller, path)) < 0)
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return r;
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if ((r = cg_attach(controller, path, pid)) < 0)
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return r;
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if ((q = cg_attach(controller, path, pid)) < 0)
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return q;
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/* This does not remove the cgroup on failure */
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@ -279,7 +279,7 @@ static int write_to_syslog(
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msghdr.msg_iov = iovec;
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msghdr.msg_iovlen = ELEMENTSOF(iovec);
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if (sendmsg(syslog_fd, &msghdr, 0) < 0)
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if (sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)
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return -errno;
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return 1;
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@ -208,7 +208,7 @@ static int get_user_data(
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return PAM_SUCCESS;
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}
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static int create_user_group(pam_handle_t *handle, const char *group, struct passwd *pw, bool attach) {
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static int create_user_group(pam_handle_t *handle, const char *group, struct passwd *pw, bool attach, bool remember) {
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int r;
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assert(handle);
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@ -224,6 +224,17 @@ static int create_user_group(pam_handle_t *handle, const char *group, struct pas
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return PAM_SESSION_ERR;
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}
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if (r > 0 && remember) {
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/* Remember that it was us who created this group, and
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* that hence we need to remove it too. This is a
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* protection against removing the cgroup when run
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* recursively. */
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if ((r = pam_set_data(handle, "systemd.created", INT_TO_PTR(1), NULL)) != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to install created variable.");
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return r;
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}
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}
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if ((r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0 ||
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(r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to change access modes: %s", strerror(-r));
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@ -247,7 +258,7 @@ _public_ PAM_EXTERN int pam_sm_open_session(
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assert(handle);
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pam_syslog(handle, LOG_INFO, "pam-systemd initializing");
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/* pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); */
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if (parse_argv(handle, argc, argv, &create_session, NULL, NULL) < 0)
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return PAM_SESSION_ERR;
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@ -331,7 +342,9 @@ _public_ PAM_EXTERN int pam_sm_open_session(
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goto finish;
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}
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if ((r = create_user_group(handle, buf, pw, true)) != PAM_SUCCESS)
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pam_syslog(handle, LOG_INFO, "Moving new user session for %s into control group %s.", username, buf);
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if ((r = create_user_group(handle, buf, pw, true, true)) != PAM_SUCCESS)
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goto finish;
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r = PAM_SUCCESS;
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@ -383,6 +396,7 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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char *session_path = NULL, *nosession_path = NULL, *user_path = NULL;
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const char *id;
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struct passwd *pw;
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const void *created = NULL;
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assert(handle);
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@ -411,7 +425,9 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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goto finish;
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}
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if ((id = pam_getenv(handle, "XDG_SESSION_ID"))) {
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pam_get_data(handle, "systemd.created", &created);
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if ((id = pam_getenv(handle, "XDG_SESSION_ID")) && created) {
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if (asprintf(&session_path, "/user/%s/%s", username, id) < 0 ||
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asprintf(&nosession_path, "/user/%s/no-session", username) < 0) {
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@ -420,15 +436,19 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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}
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if (kill_session) {
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pam_syslog(handle, LOG_INFO, "Killing remaining processes of user session %s of %s.", id, username);
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/* Kill processes in session cgroup, and delete it */
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if ((r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, session_path, true)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to kill session cgroup: %s", strerror(-r));
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} else {
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pam_syslog(handle, LOG_INFO, "Moving remaining processes of user session %s of %s into control group %s.", id, username, nosession_path);
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/* Migrate processes from session to
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* no-session cgroup. First, try to create the
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* no-session group in case it doesn't exist
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* yet. Also, delete the session group. */
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create_user_group(handle, nosession_path, pw, 0);
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create_user_group(handle, nosession_path, pw, false, false);
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if ((r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, session_path, nosession_path, false, true)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to migrate session cgroup: %s", strerror(-r));
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@ -465,13 +485,13 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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if (r >= 0) {
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const char *runtime_dir;
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/* This will migrate us to the /user cgroup. */
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if ((runtime_dir = pam_getenv(handle, "XDG_RUNTIME_DIR")))
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if ((r = rm_rf(runtime_dir, false, true)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to remove runtime directory: %s", strerror(-r));
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}
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/* pam_syslog(handle, LOG_DEBUG, "pam-systemd done"); */
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r = PAM_SUCCESS;
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finish:
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