Merge pull request #30739 from poettering/pam-util-many

pam-util: add pam_get_item_many() to shorten some code

src/home/pam_systemd_home.c

@@ -969,13 +969,12 @@ _public_ PAM_EXTERN int pam_sm_chauthtok(
                 return r;
 
         /* Start with cached credentials */
-        r = pam_get_item(handle, PAM_OLDAUTHTOK, (const void**) &old_password);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get old password: @PAMERR@");
-
-        r = pam_get_item(handle, PAM_AUTHTOK, (const void**) &new_password);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get cached password: @PAMERR@");
+        r = pam_get_item_many(
+                        handle,
+                        PAM_OLDAUTHTOK, &old_password,
+                        PAM_AUTHTOK, &new_password);
+        if (r != PAM_SUCCESS)
+                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get cached passwords: @PAMERR@");
 
         if (isempty(new_password)) {
                 /* No, it's not cached, then let's ask for the password and its verification, and cache

src/login/pam_systemd.c

@@ -926,15 +926,20 @@ _public_ PAM_EXTERN int pam_sm_open_session(
         if (!logind_running())
                 goto success;
 
-        /* Make sure we don't enter a loop by talking to
-         * systemd-logind when it is actually waiting for the
-         * background to finish start-up. If the service is
-         * "systemd-user" we simply set XDG_RUNTIME_DIR and
+        r = pam_get_item_many(
+                        handle,
+                        PAM_SERVICE, &service,
+                        PAM_XDISPLAY, &display,
+                        PAM_TTY, &tty,
+                        PAM_RUSER, &remote_user,
+                        PAM_RHOST, &remote_host);
+        if (r != PAM_SUCCESS)
+                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM items: @PAMERR@");
+
+        /* Make sure we don't enter a loop by talking to systemd-logind when it is actually waiting for the
+         * background to finish start-up. If the service is "systemd-user" we simply set XDG_RUNTIME_DIR and
          * leave. */
 
-        r = pam_get_item(handle, PAM_SERVICE, (const void**) &service);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM service: @PAMERR@");
         if (streq_ptr(service, "systemd-user")) {
                 char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)];
 
@@ -948,19 +953,6 @@ _public_ PAM_EXTERN int pam_sm_open_session(
 
         /* Otherwise, we ask logind to create a session for us */
 
-        r = pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM_XDISPLAY: @PAMERR@");
-        r = pam_get_item(handle, PAM_TTY, (const void**) &tty);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM_TTY: @PAMERR@");
-        r = pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM_RUSER: @PAMERR@");
-        r = pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
-        if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
-                return pam_syslog_pam_error(handle, LOG_ERR, r, "Failed to get PAM_RHOST: @PAMERR@");
-
         seat = getenv_harder(handle, "XDG_SEAT", NULL);
         cvtnr = getenv_harder(handle, "XDG_VTNR", NULL);
         type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam);

src/shared/pam-util.c

@@ -202,3 +202,27 @@ void pam_cleanup_free(pam_handle_t *handle, void *data, int error_status) {
         /* A generic destructor for pam_set_data() that just frees the specified data */
         free(data);
 }
+
+int pam_get_item_many_internal(pam_handle_t *handle, ...) {
+        va_list ap;
+        int r;
+
+        va_start(ap, handle);
+        for (;;) {
+                int item_type = va_arg(ap, int);
+
+                if (item_type <= 0) {
+                        r = PAM_SUCCESS;
+                        break;
+                }
+
+                const void **value = ASSERT_PTR(va_arg(ap, const void **));
+
+                r = pam_get_item(handle, item_type, value);
+                if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS))
+                        break;
+        }
+        va_end(ap);
+
+        return r;
+}

src/shared/pam-util.h

@@ -39,3 +39,7 @@ int pam_acquire_bus_connection(pam_handle_t *handle, const char *module_name, sd
 int pam_release_bus_connection(pam_handle_t *handle, const char *module_name);
 
 void pam_cleanup_free(pam_handle_t *handle, void *data, int error_status);
+
+int pam_get_item_many_internal(pam_handle_t *handle, ...);
+
+#define pam_get_item_many(handle, ...) pam_get_item_many_internal(handle, __VA_ARGS__, -1)