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Diffstat (limited to 'src/pam-module.c')
-rw-r--r--src/pam-module.c125
1 files changed, 108 insertions, 17 deletions
diff --git a/src/pam-module.c b/src/pam-module.c
index 117df05181..7f91584705 100644
--- a/src/pam-module.c
+++ b/src/pam-module.c
@@ -42,12 +42,14 @@ static int parse_argv(pam_handle_t *handle,
bool *create_session,
bool *kill_session,
bool *kill_user,
- bool *keep_root,
char ***controllers,
- char ***reset_controllers) {
+ char ***reset_controllers,
+ char ***kill_only_users,
+ char ***kill_exclude_users) {
unsigned i;
bool reset_controller_set = false;
+ bool kill_exclude_users_set = false;
assert(argc >= 0);
assert(argc == 0 || argv);
@@ -82,15 +84,6 @@ static int parse_argv(pam_handle_t *handle,
if (kill_user)
*kill_user = k;
- } else if (startswith(argv[i], "keep-root=")) {
- if ((k = parse_boolean(argv[i] + 10)) < 0) {
- pam_syslog(handle, LOG_ERR, "Failed to parse keep-root= argument.");
- return k;
- }
-
- if (keep_root)
- *keep_root = k;
-
} else if (startswith(argv[i], "controllers=")) {
if (controllers) {
@@ -121,6 +114,36 @@ static int parse_argv(pam_handle_t *handle,
reset_controller_set = true;
+ } else if (startswith(argv[i], "kill-only-users=")) {
+
+ if (kill_only_users) {
+ char **l;
+
+ if (!(l = strv_split(argv[i] + 16, ","))) {
+ pam_syslog(handle, LOG_ERR, "Out of memory.");
+ return -ENOMEM;
+ }
+
+ strv_free(*kill_only_users);
+ *kill_only_users = l;
+ }
+
+ } else if (startswith(argv[i], "kill-exclude-users=")) {
+
+ if (kill_exclude_users) {
+ char **l;
+
+ if (!(l = strv_split(argv[i] + 19, ","))) {
+ pam_syslog(handle, LOG_ERR, "Out of memory.");
+ return -ENOMEM;
+ }
+
+ strv_free(*kill_exclude_users);
+ *kill_exclude_users = l;
+ }
+
+ kill_exclude_users_set = true;
+
} else {
pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
return -EINVAL;
@@ -147,6 +170,17 @@ static int parse_argv(pam_handle_t *handle,
if (kill_session && *kill_session && kill_user)
*kill_user = true;
+ if (!kill_exclude_users_set && kill_exclude_users) {
+ char **l;
+
+ if (!(l = strv_new("root", NULL))) {
+ pam_syslog(handle, LOG_ERR, "Out of memory");
+ return -ENOMEM;
+ }
+
+ *kill_exclude_users = l;
+ }
+
return 0;
}
@@ -369,7 +403,11 @@ _public_ PAM_EXTERN int pam_sm_open_session(
if (sd_booted() <= 0)
return PAM_SUCCESS;
- if (parse_argv(handle, argc, argv, &create_session, NULL, NULL, NULL, &controllers, &reset_controllers) < 0)
+ if (parse_argv(handle,
+ argc, argv,
+ &create_session, NULL, NULL,
+ &controllers, &reset_controllers,
+ NULL, NULL) < 0)
return PAM_SESSION_ERR;
if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS)
@@ -500,6 +538,54 @@ static int session_remains(pam_handle_t *handle, const char *user_path) {
return !!remains;
}
+static bool check_user_lists(
+ pam_handle_t *handle,
+ uid_t uid,
+ char **kill_only_users,
+ char **kill_exclude_users) {
+
+ const char *name = NULL;
+ char **l;
+
+ assert(handle);
+
+ if (uid == 0)
+ name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
+ else {
+ struct passwd *pw;
+
+ if ((pw = pam_modutil_getpwuid(handle, uid)))
+ name = pw->pw_name;
+ }
+
+ STRV_FOREACH(l, kill_exclude_users) {
+ uint32_t id;
+
+ if (safe_atou32(*l, &id) >= 0)
+ if ((uid_t) id == uid)
+ return false;
+
+ if (name && streq(name, *l))
+ return false;
+ }
+
+ if (strv_isempty(kill_only_users))
+ return true;
+
+ STRV_FOREACH(l, kill_only_users) {
+ uint32_t id;
+
+ if (safe_atou32(*l, &id) >= 0)
+ if ((uid_t) id == uid)
+ return true;
+
+ if (name && streq(name, *l))
+ return true;
+ }
+
+ return false;
+}
+
_public_ PAM_EXTERN int pam_sm_close_session(
pam_handle_t *handle,
int flags,
@@ -508,13 +594,12 @@ _public_ PAM_EXTERN int pam_sm_close_session(
const char *username = NULL;
bool kill_session = false;
bool kill_user = false;
- bool keep_root = true;
int lock_fd = -1, r;
char *session_path = NULL, *nosession_path = NULL, *user_path = NULL;
const char *id;
struct passwd *pw;
const void *created = NULL;
- char **controllers = NULL, **c;
+ char **controllers = NULL, **c, **kill_only_users = NULL, **kill_exclude_users = NULL;
assert(handle);
@@ -522,7 +607,11 @@ _public_ PAM_EXTERN int pam_sm_close_session(
if (sd_booted() <= 0)
return PAM_SUCCESS;
- if (parse_argv(handle, argc, argv, NULL, &kill_session, &kill_user, &keep_root, &controllers, NULL) < 0)
+ if (parse_argv(handle,
+ argc, argv,
+ NULL, &kill_session, &kill_user,
+ &controllers, NULL,
+ &kill_only_users, &kill_exclude_users) < 0)
return PAM_SESSION_ERR;
if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS)
@@ -557,7 +646,7 @@ _public_ PAM_EXTERN int pam_sm_close_session(
goto finish;
}
- if (kill_session && (pw->pw_uid != 0 || !keep_root)) {
+ if (kill_session && check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users)) {
pam_syslog(handle, LOG_INFO, "Killing remaining processes of user session %s of %s.", id, username);
/* Kill processes in session cgroup, and delete it */
@@ -591,7 +680,7 @@ _public_ PAM_EXTERN int pam_sm_close_session(
pam_syslog(handle, LOG_ERR, "Failed to determine whether a session remains: %s", strerror(-r));
/* Kill user processes not attached to any session */
- if (kill_user && r == 0 && (pw->pw_uid != 0 || !keep_root)) {
+ if (kill_user && r == 0 && check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users)) {
/* Kill user cgroup */
if ((r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, user_path, true)) < 0)
@@ -635,6 +724,8 @@ finish:
free(user_path);
strv_free(controllers);
+ strv_free(kill_exclude_users);
+ strv_free(kill_only_users);
return r;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-04 04:11:14 +0000