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https://github.com/systemd/systemd-stable.git
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pam: duplicate cgroup tree in the cpu hierarchy by default, optionally more
This commit is contained in:
Lennart Poettering
parent
04d148459f
commit
74fe1fe36e
4
TODO
4
TODO
@ -88,6 +88,10 @@
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* add to cpu cgroup by default
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* introduce crypttab.target
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* make cryptsetup lower --iter-time
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External:
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* patch kernel for xattr support in /dev, /proc/, /sys and /sys/fs/cgroup.
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@ -35,14 +35,17 @@
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#include "cgroup-util.h"
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#include "macro.h"
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#include "sd-daemon.h"
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#include "strv.h"
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static int parse_argv(pam_handle_t *handle,
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int argc, const char **argv,
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bool *create_session,
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bool *kill_session,
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bool *kill_user) {
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bool *kill_user,
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char ***controllers) {
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unsigned i;
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bool controller_set = false;
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assert(argc >= 0);
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assert(argc == 0 || argv);
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@ -58,6 +61,7 @@ static int parse_argv(pam_handle_t *handle,
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if (create_session)
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*create_session = k;
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} else if (startswith(argv[i], "kill-session=")) {
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if ((k = parse_boolean(argv[i] + 13)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
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@ -75,12 +79,43 @@ static int parse_argv(pam_handle_t *handle,
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if (kill_user)
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*kill_user = k;
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} else if (startswith(argv[i], "controllers=")) {
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if (controllers) {
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char **l;
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if (!(l = strv_split(argv[i] + 12, ","))) {
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pam_syslog(handle, LOG_ERR, "Out of memory.");
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return -ENOMEM;
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}
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strv_free(*controllers);
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*controllers = l;
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}
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controller_set = true;
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} else {
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pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
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return -EINVAL;
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}
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}
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if (!controller_set && controllers) {
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char **l;
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if (!(l = strv_new("cpu", NULL))) {
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pam_syslog(handle, LOG_ERR, "Out of memory");
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return -ENOMEM;
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}
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*controllers = l;
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}
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if (controllers)
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strv_remove(*controllers, "name=systemd");
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if (kill_session && *kill_session && kill_user)
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*kill_user = true;
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@ -226,16 +261,23 @@ 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, bool remember) {
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static int create_user_group(
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pam_handle_t *handle,
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const char *controller,
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const char *group,
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struct passwd *pw,
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bool attach,
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bool remember) {
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int r;
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assert(handle);
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assert(group);
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if (attach)
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r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, group, 0);
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r = cg_create_and_attach(controller, group, 0);
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else
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r = cg_create(SYSTEMD_CGROUP_CONTROLLER, group);
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r = cg_create(controller, group);
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if (r < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to create cgroup: %s", strerror(-r));
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@ -253,8 +295,8 @@ static int create_user_group(pam_handle_t *handle, const char *group, struct pas
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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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if ((r = cg_set_task_access(controller, group, 0644, pw->pw_uid, pw->pw_gid)) < 0 ||
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(r = cg_set_group_access(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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return PAM_SESSION_ERR;
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}
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@ -273,18 +315,19 @@ _public_ PAM_EXTERN int pam_sm_open_session(
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char *buf = NULL;
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int lock_fd = -1;
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bool create_session = true;
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char **controllers = NULL, **c;
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assert(handle);
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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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/* Make this a NOP on non-systemd systems */
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if (sd_booted() <= 0)
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return PAM_SUCCESS;
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if (parse_argv(handle, argc, argv, &create_session, NULL, NULL, &controllers) < 0)
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return PAM_SESSION_ERR;
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if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS)
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goto finish;
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@ -362,9 +405,14 @@ _public_ PAM_EXTERN int pam_sm_open_session(
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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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if ((r = create_user_group(handle, SYSTEMD_CGROUP_CONTROLLER, buf, pw, true, true)) != PAM_SUCCESS)
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goto finish;
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/* The additional controllers don't really matter, so we
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* ignore the return value */
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STRV_FOREACH(c, controllers)
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create_user_group(handle, *c, buf, pw, true, false);
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r = PAM_SUCCESS;
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finish:
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@ -373,6 +421,8 @@ finish:
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if (lock_fd >= 0)
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close_nointr_nofail(lock_fd);
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strv_free(controllers);
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return r;
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}
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@ -415,16 +465,17 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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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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char **controllers = NULL, **c;
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assert(handle);
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if (parse_argv(handle, argc, argv, NULL, &kill_session, &kill_user) < 0)
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return PAM_SESSION_ERR;
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/* Make this a NOP on non-systemd systems */
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if (sd_booted() <= 0)
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return PAM_SUCCESS;
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if (parse_argv(handle, argc, argv, NULL, &kill_session, &kill_user, &controllers) < 0)
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return PAM_SESSION_ERR;
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if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS)
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goto finish;
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@ -438,6 +489,10 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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if ((r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, "/user", 0)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to move us away: %s", strerror(-r));
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STRV_FOREACH(c, controllers)
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if ((r = cg_attach(*c, "/user", 0)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to move us away in %s hierarchy: %s", *c, strerror(-r));
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if (asprintf(&user_path, "/user/%s", username) < 0) {
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r = PAM_BUF_ERR;
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goto finish;
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@ -466,11 +521,18 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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* cgroup. First, try to create the user group
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* in case it doesn't exist yet. Also, delete
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* the session group. */
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create_user_group(handle, nosession_path, pw, false, false);
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create_user_group(handle, SYSTEMD_CGROUP_CONTROLLER, 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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}
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STRV_FOREACH(c, controllers) {
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create_user_group(handle, *c, nosession_path, pw, false, false);
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if ((r = cg_migrate_recursive(*c, session_path, nosession_path, false, true)) < 0)
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pam_syslog(handle, LOG_ERR, "Failed to migrate session cgroup in hierarchy %s: %s", *c, strerror(-r));
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}
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}
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/* GC user tree */
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@ -500,6 +562,9 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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r = -EBUSY;
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}
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STRV_FOREACH(c, controllers)
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cg_trim(*c, user_path, true);
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if (r >= 0) {
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const char *runtime_dir;
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@ -520,5 +585,7 @@ finish:
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free(nosession_path);
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free(user_path);
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strv_free(controllers);
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return r;
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}
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