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https://github.com/systemd/systemd-stable.git
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pam_systemd_home: also store acquirement fd per user
We might pin a home through authentication and a different one through a session, all from the same PAM context, like sudo does. Hence also store the referencing fd keyed by the user name.
This commit is contained in:
Lennart Poettering
parent
dbe7fff476
commit
6c8428bb8b
@ -62,27 +62,30 @@ static int parse_argv(
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static int acquire_user_record(
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pam_handle_t *handle,
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const char *username,
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UserRecord **ret_record) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
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_cleanup_(user_record_unrefp) UserRecord *ur = NULL;
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_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
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const char *username = NULL, *json = NULL;
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_cleanup_free_ char *homed_field = NULL;
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const char *json = NULL;
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int r;
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assert(handle);
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r = pam_get_user(handle, &username, NULL);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r));
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return r;
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}
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if (!username) {
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r = pam_get_user(handle, &username, NULL);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r));
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return r;
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}
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if (isempty(username)) {
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pam_syslog(handle, LOG_ERR, "User name not set.");
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return PAM_SERVICE_ERR;
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if (isempty(username)) {
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pam_syslog(handle, LOG_ERR, "User name not set.");
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return PAM_SERVICE_ERR;
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}
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}
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/* Let's bypass all IPC complexity for the two user names we know for sure we don't manage, and for
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@ -418,7 +421,9 @@ static int acquire_home(
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bool do_auth = please_authenticate, home_not_active = false, home_locked = false;
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_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
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_cleanup_close_ int acquired_fd = -1;
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_cleanup_free_ char *fd_field = NULL;
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const void *home_fd_ptr = NULL;
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const char *username = NULL;
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unsigned n_attempts = 0;
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int r;
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@ -432,8 +437,27 @@ static int acquire_home(
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* authenticates, while the other PAM hooks unset it so that they can a ref of their own without
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* authentication if possible, but with authentication if necessary. */
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r = pam_get_user(handle, &username, NULL);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r));
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return r;
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}
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if (isempty(username)) {
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pam_syslog(handle, LOG_ERR, "User name not set.");
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return PAM_SERVICE_ERR;
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}
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/* If we already have acquired the fd, let's shortcut this */
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r = pam_get_data(handle, "systemd-home-fd", &home_fd_ptr);
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fd_field = strjoin("systemd-home-fd-", username);
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if (!fd_field)
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return pam_log_oom(handle);
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r = pam_get_data(handle, fd_field, &home_fd_ptr);
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if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) {
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pam_syslog(handle, LOG_ERR, "Failed to retrieve PAM home reference fd: %s", pam_strerror(handle, r));
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return r;
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}
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if (r == PAM_SUCCESS && PTR_TO_FD(home_fd_ptr) >= 0)
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return PAM_SUCCESS;
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@ -441,7 +465,7 @@ static int acquire_home(
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if (r != PAM_SUCCESS)
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return r;
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r = acquire_user_record(handle, &ur);
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r = acquire_user_record(handle, username, &ur);
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if (r != PAM_SUCCESS)
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return r;
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@ -557,7 +581,7 @@ static int acquire_home(
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do_auth = true;
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}
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r = pam_set_data(handle, "systemd-home-fd", FD_TO_PTR(acquired_fd), cleanup_home_fd);
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r = pam_set_data(handle, fd_field, FD_TO_PTR(acquired_fd), cleanup_home_fd);
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if (r < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to set PAM bus data: %s", pam_strerror(handle, r));
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return r;
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@ -578,15 +602,27 @@ static int acquire_home(
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return PAM_SUCCESS;
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}
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static int release_home_fd(pam_handle_t *handle) {
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static int release_home_fd(pam_handle_t *handle, const char *username) {
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_cleanup_free_ char *fd_field = NULL;
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const void *home_fd_ptr = NULL;
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int r;
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r = pam_get_data(handle, "systemd-home-fd", &home_fd_ptr);
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if (r == PAM_NO_MODULE_DATA || PTR_TO_FD(home_fd_ptr) < 0)
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return PAM_NO_MODULE_DATA;
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assert(handle);
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assert(username);
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r = pam_set_data(handle, "systemd-home-fd", NULL, NULL);
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fd_field = strjoin("systemd-home-fd-", username);
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if (!fd_field)
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return pam_log_oom(handle);
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r = pam_get_data(handle, fd_field, &home_fd_ptr);
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if (r == PAM_NO_MODULE_DATA || (r == PAM_SUCCESS && PTR_TO_FD(home_fd_ptr) < 0))
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return PAM_NO_MODULE_DATA;
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to retrieve PAM home reference fd: %s", pam_strerror(handle, r));
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return r;
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}
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r = pam_set_data(handle, fd_field, NULL, NULL);
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if (r != PAM_SUCCESS)
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pam_syslog(handle, LOG_ERR, "Failed to release PAM home reference fd: %s", pam_strerror(handle, r));
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@ -673,20 +709,25 @@ _public_ PAM_EXTERN int pam_sm_close_session(
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if (debug)
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pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed session end");
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/* Let's explicitly drop the reference to the homed session, so that the subsequent ReleaseHome()
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* call will be able to do its thing. */
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r = release_home_fd(handle);
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if (r == PAM_NO_MODULE_DATA) /* Nothing to do, we never acquired an fd */
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return PAM_SUCCESS;
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if (r != PAM_SUCCESS)
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return r;
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r = pam_get_user(handle, &username, NULL);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r));
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return r;
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}
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if (isempty(username)) {
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pam_syslog(handle, LOG_ERR, "User name not set.");
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return PAM_SERVICE_ERR;
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}
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/* Let's explicitly drop the reference to the homed session, so that the subsequent ReleaseHome()
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* call will be able to do its thing. */
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r = release_home_fd(handle, username);
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if (r == PAM_NO_MODULE_DATA) /* Nothing to do, we never acquired an fd */
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return PAM_SUCCESS;
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if (r != PAM_SUCCESS)
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return r;
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r = pam_acquire_bus_connection(handle, &bus);
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if (r != PAM_SUCCESS)
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return r;
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@ -738,7 +779,7 @@ _public_ PAM_EXTERN int pam_sm_acct_mgmt(
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if (r != PAM_SUCCESS)
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return r;
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r = acquire_user_record(handle, &ur);
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r = acquire_user_record(handle, NULL, &ur);
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if (r != PAM_SUCCESS)
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return r;
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@ -846,7 +887,7 @@ _public_ PAM_EXTERN int pam_sm_chauthtok(
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if (r != PAM_SUCCESS)
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return r;
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r = acquire_user_record(handle, &ur);
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r = acquire_user_record(handle, NULL, &ur);
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if (r != PAM_SUCCESS)
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return r;
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