Fix bug #80669: FPM numeric user fails to set groups

sapi/fpm/fpm/fpm_unix.c

@@ -269,6 +269,11 @@ static int fpm_unix_conf_wp(struct fpm_worker_pool_s *wp) /* {{{ */
 		if (wp->config->user && *wp->config->user) {
 			if (strlen(wp->config->user) == strspn(wp->config->user, "0123456789")) {
 				wp->set_uid = strtoul(wp->config->user, 0, 10);
+				pwd = getpwuid(wp->set_uid);
+				if (pwd) {
+					wp->set_gid = pwd->pw_gid;
+					wp->set_user = strdup(pwd->pw_name);
+				}
 			} else {
 				struct passwd *pwd;
 
@@ -392,7 +397,7 @@ int fpm_unix_init_child(struct fpm_worker_pool_s *wp) /* {{{ */
 			}
 		}
 		if (wp->set_uid) {
-			if (0 > initgroups(wp->config->user, wp->set_gid)) {
+			if (0 > initgroups(wp->set_user ? wp->set_user : wp->config->user, wp->set_gid)) {
 				zlog(ZLOG_SYSERROR, "[pool %s] failed to initgroups(%s, %d)", wp->config->name, wp->config->user, wp->set_gid);
 				return -1;
 			}

sapi/fpm/fpm/fpm_worker_pool.c

@@ -34,6 +34,9 @@ void fpm_worker_pool_free(struct fpm_worker_pool_s *wp) /* {{{ */
 	if (wp->user) {
 		free(wp->user);
 	}
+	if (wp->set_user) {
+		free(wp->set_user);
+	}
 	if (wp->home) {
 		free(wp->home);
 	}

sapi/fpm/fpm/fpm_worker_pool.h

@@ -24,6 +24,7 @@ struct fpm_worker_pool_s {
 	enum fpm_address_domain listen_address_domain;
 	int listening_socket;
 	int set_uid, set_gid;								/* config uid and gid */
+	char *set_user;										/* config user name */
 	int socket_uid, socket_gid, socket_mode;
 
 	/* runtime */

sapi/fpm/tests/bug80669-uid-user-groups.phpt

@@ -0,0 +1,52 @@
+--TEST--
+FPM: Process user setting ignored when FPM is not running as root
+--SKIPIF--
+<?php
+include "skipif.inc";
+FPM\Tester::skipIfNotRoot();
+FPM\Tester::skipIfUserDoesNotExist('www-data');
+?>
+--FILE--
+<?php
+
+require_once "tester.inc";
+
+$pw = posix_getpwnam('www-data');
+$uid = $pw['uid'];
+$gid = $pw['gid'];
+
+$cfg = <<<EOT
+[global]
+error_log = {{FILE:LOG}}
+[unconfined]
+listen = {{ADDR}}
+user = $uid
+pm = dynamic
+pm.max_children = 5
+pm.start_servers = 1
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
+EOT;
+
+$code = <<<EOT
+<?php
+echo posix_getgid();
+EOT;
+
+$tester = new FPM\Tester($cfg, $code);
+$tester->start();
+$tester->expectLogStartNotices();
+$tester->request()->expectBody((string) $gid);
+$tester->terminate();
+$tester->expectLogTerminatingNotices();
+$tester->close();
+
+?>
+Done
+--EXPECT--
+Done
+--CLEAN--
+<?php
+require_once "tester.inc";
+FPM\Tester::clean();
+?>

sapi/fpm/tests/response.inc

@@ -71,11 +71,11 @@ class Response
             $body = implode("\n", $body);
         }
 
-        if (
-            $this->checkIfValid() &&
-            $this->checkDefaultHeaders($contentType) &&
-            $body !== $this->rawBody
-        ) {
+        if (!$this->checkIfValid()) {
+            $this->error('Response is invalid');
+        } elseif (!$this->checkDefaultHeaders($contentType)) {
+            $this->error('Response default headers not found');
+        } elseif ($body !== $this->rawBody) {
             if ($multiLine) {
                 $this->error(
                     "==> The expected body:\n$body\n" .

sapi/fpm/tests/tester.inc

@@ -294,7 +294,7 @@ class Tester
      */
     static public function skipIfNotRoot()
     {
-        if (getmyuid() != 0) {
+        if (exec('whoami') !== 'root') {
             die('skip not running as root');
         }
     }
@@ -304,7 +304,7 @@ class Tester
      */
     static public function skipIfRoot()
     {
-        if (getmyuid() == 0) {
+        if (exec('whoami') === 'root') {
             die('skip running as root');
         }
     }
@@ -319,6 +319,17 @@ class Tester
         }
     }
 
+    /**
+     * Skip if posix extension not loaded.
+     */
+    static public function skipIfUserDoesNotExist($userName)
+    {
+        self::skipIfPosixNotLoaded();
+        if (posix_getpwnam($userName) === false) {
+            die("skip user $userName does not exist");
+        }
+    }
+
     /**
      * Tester constructor.
      *