httpd/httpd-2.4.2-r1337344+.patch

suexec enhancements:

1) use syslog for logging
2) use capabilities not setuid/setgid root binary

http://svn.apache.org/viewvc?view=revision&revision=1337344
http://svn.apache.org/viewvc?view=revision&revision=1341905
http://svn.apache.org/viewvc?view=revision&revision=1342065
http://svn.apache.org/viewvc?view=revision&revision=1341930

--- httpd-2.4.2/configure.in.r1337344+
+++ httpd-2.4.2/configure.in
@@ -700,7 +700,24 @@ APACHE_HELP_STRING(--with-suexec-gidmin,
 
 AC_ARG_WITH(suexec-logfile,
 APACHE_HELP_STRING(--with-suexec-logfile,Set the logfile),[
-  AC_DEFINE_UNQUOTED(AP_LOG_EXEC, "$withval", [SuExec log file] ) ] )
+  if test "x$withval" = "xyes"; then
+    AC_DEFINE_UNQUOTED(AP_LOG_EXEC, "$withval", [SuExec log file])
+  fi
+])
+
+AC_ARG_WITH(suexec-syslog,
+APACHE_HELP_STRING(--with-suexec-syslog,Set the logfile),[
+  if test $withval = "yes"; then
+    if test "x${with_suexec_logfile}" != "xno"; then
+      AC_MSG_NOTICE([hint: use "--without-suexec-logfile --with-suexec-syslog"])
+      AC_MSG_ERROR([suexec does not support both logging to file and syslog])
+    fi
+    AC_CHECK_FUNCS([vsyslog], [], [
+       AC_MSG_ERROR([cannot support syslog from suexec without vsyslog()])])
+    AC_DEFINE(AP_LOG_SYSLOG, 1, [SuExec log to syslog])
+  fi    
+])
+
 
 AC_ARG_WITH(suexec-safepath,
 APACHE_HELP_STRING(--with-suexec-safepath,Set the safepath),[
@@ -710,6 +727,15 @@ AC_ARG_WITH(suexec-umask,
 APACHE_HELP_STRING(--with-suexec-umask,umask for suexec'd process),[
   AC_DEFINE_UNQUOTED(AP_SUEXEC_UMASK, 0$withval, [umask for suexec'd process] ) ] )
 
+INSTALL_SUEXEC=setuid
+AC_ARG_ENABLE([suexec-capabilities], 
+APACHE_HELP_STRING(--enable-suexec-capabilities,Use Linux capability bits not setuid root suexec), [
+INSTALL_SUEXEC=caps
+AC_DEFINE(AP_SUEXEC_CAPABILITIES, 1, 
+          [Enable if suexec is installed with Linux capabilities, not setuid])
+])
+APACHE_SUBST(INSTALL_SUEXEC)
+
 dnl APR should go after the other libs, so the right symbols can be picked up
 if test x${apu_found} != xobsolete; then
   AP_LIBS="$AP_LIBS `$apu_config --avoid-ldap --link-libtool`"
--- httpd-2.4.2/docs/manual/suexec.html.en.r1337344+
+++ httpd-2.4.2/docs/manual/suexec.html.en
@@ -369,6 +369,21 @@
       together with the <code>--enable-suexec</code> option to let
       APACI accept your request for using the suEXEC feature.</dd>
 
+      <dt><code>--enable-suexec-capabilities</code></dt>
+
+      <dd><strong>Linux specific:</strong> Normally,
+      the <code>suexec</code> binary is installed "setuid/setgid
+      root", which allows it to run with the full privileges of the
+      root user.  If this option is used, the <code>suexec</code>
+      binary will instead be installed with only the setuid/setgid
+      "capability" bits set, which is the subset of full root
+      priviliges required for suexec operation.  Note that
+      the <code>suexec</code> binary may not be able to write to a log
+      file in this mode; it is recommended that the
+      <code>--with-suexec-syslog --without-suexec-logfile</code>
+      options are used in conjunction with this mode, so that syslog
+      logging is used instead.</dd>
+
       <dt><code>--with-suexec-bin=<em>PATH</em></code></dt>
 
       <dd>The path to the <code>suexec</code> binary must be hard-coded
@@ -430,6 +445,12 @@
       "<code>suexec_log</code>" and located in your standard logfile
       directory (<code>--logfiledir</code>).</dd>
 
+      <dt><code>--with-suexec-syslog</code></dt>
+
+      <dd>If defined, suexec will log notices and errors to syslog
+      instead of a logfile.  This option must be combined
+      with <code>--without-suexec-logfile</code>.</dd>
+
       <dt><code>--with-suexec-safepath=<em>PATH</em></code></dt>
 
       <dd>Define a safe PATH environment to pass to CGI
@@ -546,9 +567,12 @@
 
     <p>The suEXEC wrapper will write log information
     to the file defined with the <code>--with-suexec-logfile</code>
-    option as indicated above. If you feel you have configured and
-    installed the wrapper properly, have a look at this log and the
-    error_log for the server to see where you may have gone astray.</p>
+    option as indicated above, or to syslog if <code>--with-suexec-syslog</code>
+    is used. If you feel you have configured and
+    installed the wrapper properly, have a look at the log and the
+    error_log for the server to see where you may have gone astray. 
+    The output of <code>"suexec -V"</code> will show the options
+    used to compile suexec, if using a binary distribution.</p>
 
 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
 <div class="section">
@@ -615,4 +639,4 @@
 </div><div id="footer">
 <p class="apache">Copyright 2012 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
 <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div>
-</body></html>
\ No newline at end of file
+</body></html>
--- httpd-2.4.2/Makefile.in.r1337344+
+++ httpd-2.4.2/Makefile.in
@@ -236,11 +236,22 @@ install-man:
 	  cd $(DESTDIR)$(manualdir) && find . -name ".svn" -type d -print | xargs rm -rf 2>/dev/null || true; \
 	fi
 
-install-suexec:
+install-suexec: install-suexec-binary install-suexec-$(INSTALL_SUEXEC)
+
+install-suexec-binary:
 	@if test -f $(builddir)/support/suexec; then \
             test -d $(DESTDIR)$(sbindir) || $(MKINSTALLDIRS) $(DESTDIR)$(sbindir); \
             $(INSTALL_PROGRAM) $(top_builddir)/support/suexec $(DESTDIR)$(sbindir); \
-            chmod 4755 $(DESTDIR)$(sbindir)/suexec; \
+	fi
+
+install-suexec-setuid:
+	@if test -f $(builddir)/support/suexec; then \
+	    chmod 4755 $(DESTDIR)$(sbindir)/suexec; \
+	fi
+
+install-suexec-caps:
+	@if test -f $(builddir)/support/suexec; then \
+            setcap 'cap_setuid,cap_setgid+pe' $(DESTDIR)$(sbindir)/suexec; \
 	fi
 
 suexec:
--- httpd-2.4.2/modules/arch/unix/mod_unixd.c.r1337344+
+++ httpd-2.4.2/modules/arch/unix/mod_unixd.c
@@ -284,6 +284,13 @@ unixd_set_suexec(cmd_parms *cmd, void *d
     return NULL;
 }
 
+#ifdef AP_SUEXEC_CAPABILITIES
+/* If suexec is using capabilities, don't test for the setuid bit. */
+#define SETUID_TEST(finfo) (1)
+#else
+#define SETUID_TEST(finfo) (finfo.protection & APR_USETID)
+#endif
+
 static int
 unixd_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
                  apr_pool_t *ptemp)
@@ -300,7 +307,7 @@ unixd_pre_config(apr_pool_t *pconf, apr_
     ap_unixd_config.suexec_enabled = 0;
     if ((apr_stat(&wrapper, SUEXEC_BIN, APR_FINFO_NORM, ptemp))
          == APR_SUCCESS) {
-        if ((wrapper.protection & APR_USETID) && wrapper.user == 0
+        if (SETUID_TEST(wrapper) && wrapper.user == 0
             && (access(SUEXEC_BIN, R_OK|X_OK) == 0)) {
             ap_unixd_config.suexec_enabled = 1;
             ap_unixd_config.suexec_disabled_reason = "";
--- httpd-2.4.2/support/suexec.c.r1337344+
+++ httpd-2.4.2/support/suexec.c
@@ -58,6 +58,10 @@
 #include <grp.h>
 #endif
 
+#ifdef AP_LOG_SYSLOG
+#include <syslog.h>
+#endif
+
 #if defined(PATH_MAX)
 #define AP_MAXPATH PATH_MAX
 #elif defined(MAXPATHLEN)
@@ -69,7 +73,12 @@
 #define AP_ENVBUF 256
 
 extern char **environ;
+
+#ifdef AP_LOG_SYSLOG
+static int log_open;
+#else
 static FILE *log = NULL;
+#endif
 
 static const char *const safe_env_lst[] =
 {
@@ -128,10 +137,23 @@ static const char *const safe_env_lst[]
     NULL
 };
 
+static void log_err(const char *fmt,...) 
+    __attribute__((format(printf,1,2)));
+static void log_no_err(const char *fmt,...)  
+    __attribute__((format(printf,1,2)));
+static void err_output(int is_error, const char *fmt, va_list ap) 
+    __attribute__((format(printf,2,0)));
 
 static void err_output(int is_error, const char *fmt, va_list ap)
 {
-#ifdef AP_LOG_EXEC
+#if defined(AP_LOG_SYSLOG)
+    if (!log_open) {
+        openlog("suexec", LOG_PID, LOG_DAEMON);
+        log_open = 1;
+    }
+
+    vsyslog(is_error ? LOG_ERR : LOG_INFO, fmt, ap);
+#elif defined(AP_LOG_EXEC)
     time_t timevar;
     struct tm *lt;
 
@@ -263,7 +285,7 @@ int main(int argc, char *argv[])
      */
     uid = getuid();
     if ((pw = getpwuid(uid)) == NULL) {
-        log_err("crit: invalid uid: (%ld)\n", uid);
+        log_err("crit: invalid uid: (%lu)\n", (unsigned long)uid);
         exit(102);
     }
     /*
@@ -289,7 +311,9 @@ int main(int argc, char *argv[])
 #ifdef AP_HTTPD_USER
         fprintf(stderr, " -D AP_HTTPD_USER=\"%s\"\n", AP_HTTPD_USER);
 #endif
-#ifdef AP_LOG_EXEC
+#if defined(AP_LOG_SYSLOG)
+        fprintf(stderr, " -D AP_LOG_SYSLOG\n");
+#elif defined(AP_LOG_EXEC)
         fprintf(stderr, " -D AP_LOG_EXEC=\"%s\"\n", AP_LOG_EXEC);
 #endif
 #ifdef AP_SAFE_PATH
@@ -440,7 +464,7 @@ int main(int argc, char *argv[])
      * a UID less than AP_UID_MIN.  Tsk tsk.
      */
     if ((uid == 0) || (uid < AP_UID_MIN)) {
-        log_err("cannot run as forbidden uid (%d/%s)\n", uid, cmd);
+        log_err("cannot run as forbidden uid (%lu/%s)\n", (unsigned long)uid, cmd);
         exit(107);
     }
 
@@ -449,7 +473,7 @@ int main(int argc, char *argv[])
      * or as a GID less than AP_GID_MIN.  Tsk tsk.
      */
     if ((gid == 0) || (gid < AP_GID_MIN)) {
-        log_err("cannot run as forbidden gid (%d/%s)\n", gid, cmd);
+        log_err("cannot run as forbidden gid (%lu/%s)\n", (unsigned long)gid, cmd);
         exit(108);
     }
 
@@ -460,7 +484,7 @@ int main(int argc, char *argv[])
      * and setgid() to the target group. If unsuccessful, error out.
      */
     if (((setgid(gid)) != 0) || (initgroups(actual_uname, gid) != 0)) {
-        log_err("failed to setgid (%ld: %s)\n", gid, cmd);
+        log_err("failed to setgid (%lu: %s)\n", (unsigned long)gid, cmd);
         exit(109);
     }
 
@@ -468,7 +492,7 @@ int main(int argc, char *argv[])
      * setuid() to the target user.  Error out on fail.
      */
     if ((setuid(uid)) != 0) {
-        log_err("failed to setuid (%ld: %s)\n", uid, cmd);
+        log_err("failed to setuid (%lu: %s)\n", (unsigned long)uid, cmd);
         exit(110);
     }
 
@@ -556,11 +580,11 @@ int main(int argc, char *argv[])
         (gid != dir_info.st_gid) ||
         (uid != prg_info.st_uid) ||
         (gid != prg_info.st_gid)) {
-        log_err("target uid/gid (%ld/%ld) mismatch "
-                "with directory (%ld/%ld) or program (%ld/%ld)\n",
-                uid, gid,
-                dir_info.st_uid, dir_info.st_gid,
-                prg_info.st_uid, prg_info.st_gid);
+        log_err("target uid/gid (%lu/%lu) mismatch "
+                "with directory (%lu/%lu) or program (%lu/%lu)\n",
+                (unsigned long)uid, (unsigned long)gid,
+                (unsigned long)dir_info.st_uid, (unsigned long)dir_info.st_gid,
+                (unsigned long)prg_info.st_uid, (unsigned long)prg_info.st_gid);
         exit(120);
     }
     /*
@@ -585,6 +609,12 @@ int main(int argc, char *argv[])
 #endif /* AP_SUEXEC_UMASK */
 
     /* Be sure to close the log file so the CGI can't mess with it. */
+#ifdef AP_LOG_SYSLOG
+    if (log_open) {
+        closelog();
+        log_open = 0;
+    }
+#else
     if (log != NULL) {
 #if APR_HAVE_FCNTL_H
         /*
@@ -606,6 +636,7 @@ int main(int argc, char *argv[])
         log = NULL;
 #endif
     }
+#endif
 
     /*
      * Execute the command, replacing our image with its own.