startup: initialize run as user info sooner

Initialize the run-as user info after loading the config, but
before setting up logging (previously it was done while initializing
signal handlers). This will allow the log file to be given the
correct permissions if Suricata is configured to run as a non-root
user.

src/suricata.c

@@ -2046,34 +2046,10 @@ static int MayDaemonize(SCInstance *suri)
     return TM_ECODE_OK;
 }
 
-static int InitSignalHandler(SCInstance *suri)
+/* Initialize the user and group Suricata is to run as. */
+static int InitRunAs(SCInstance *suri)
 {
-    /* registering signals we use */
-#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
-    UtilSignalHandlerSetup(SIGINT, SignalHandlerSigint);
-    UtilSignalHandlerSetup(SIGTERM, SignalHandlerSigterm);
-#if HAVE_LIBUNWIND
-    int enabled;
-    if (ConfGetBool("logging.stacktrace-on-signal", &enabled) == 0) {
-        enabled = 1;
-    }
-
-    if (enabled) {
-        SCLogInfo("Preparing unexpected signal handling");
-        struct sigaction stacktrace_action;
-        memset(&stacktrace_action, 0, sizeof(stacktrace_action));
-        stacktrace_action.sa_sigaction = SignalHandlerUnexpected;
-        stacktrace_action.sa_flags = SA_SIGINFO;
-        sigaction(SIGSEGV, &stacktrace_action, NULL);
-        sigaction(SIGABRT, &stacktrace_action, NULL);
-    }
-#endif /* HAVE_LIBUNWIND */
-#endif
 #ifndef OS_WIN32
-    UtilSignalHandlerSetup(SIGHUP, SignalHandlerSigHup);
-    UtilSignalHandlerSetup(SIGPIPE, SIG_IGN);
-    UtilSignalHandlerSetup(SIGSYS, SIG_IGN);
-
     /* Try to get user/group to run suricata as if
        command line as not decide of that */
     if (suri->do_setuid == FALSE && suri->do_setgid == FALSE) {
@@ -2105,6 +2081,37 @@ static int InitSignalHandler(SCInstance *suri)
 
         sc_set_caps = TRUE;
     }
+#endif
+    return TM_ECODE_OK;
+}
+
+static int InitSignalHandler(SCInstance *suri)
+{
+    /* registering signals we use */
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    UtilSignalHandlerSetup(SIGINT, SignalHandlerSigint);
+    UtilSignalHandlerSetup(SIGTERM, SignalHandlerSigterm);
+#if HAVE_LIBUNWIND
+    int enabled;
+    if (ConfGetBool("logging.stacktrace-on-signal", &enabled) == 0) {
+        enabled = 1;
+    }
+
+    if (enabled) {
+        SCLogInfo("Preparing unexpected signal handling");
+        struct sigaction stacktrace_action;
+        memset(&stacktrace_action, 0, sizeof(stacktrace_action));
+        stacktrace_action.sa_sigaction = SignalHandlerUnexpected;
+        stacktrace_action.sa_flags = SA_SIGINFO;
+        sigaction(SIGSEGV, &stacktrace_action, NULL);
+        sigaction(SIGABRT, &stacktrace_action, NULL);
+    }
+#endif /* HAVE_LIBUNWIND */
+#endif
+#ifndef OS_WIN32
+    UtilSignalHandlerSetup(SIGHUP, SignalHandlerSigHup);
+    UtilSignalHandlerSetup(SIGPIPE, SIG_IGN);
+    UtilSignalHandlerSetup(SIGSYS, SIG_IGN);
 #endif /* OS_WIN32 */
 
     return TM_ECODE_OK;
@@ -2876,6 +2883,7 @@ int SuricataMain(int argc, char **argv)
     SCLogDebug("vlan tracking is %s", vlan_tracking == 1 ? "enabled" : "disabled");
 
     SetupUserMode(&suricata);
+    InitRunAs(&suricata);
 
     /* Since our config is now loaded we can finish configurating the
      * logging module. */