Blame SOURCES/httpd-2.4.4-r1337344+.patch

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# ./pullrev.sh 1337344 1341905 1342065 1341930
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suexec enhancements:
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1) use syslog for logging
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2) use capabilities not setuid/setgid root binary
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http://svn.apache.org/viewvc?view=revision&revision=1337344
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http://svn.apache.org/viewvc?view=revision&revision=1341905
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http://svn.apache.org/viewvc?view=revision&revision=1342065
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http://svn.apache.org/viewvc?view=revision&revision=1341930
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--- httpd-2.4.4/configure.in.r1337344+
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+++ httpd-2.4.4/configure.in
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@@ -734,7 +734,24 @@ APACHE_HELP_STRING(--with-suexec-gidmin,
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 AC_ARG_WITH(suexec-logfile,
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 APACHE_HELP_STRING(--with-suexec-logfile,Set the logfile),[
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-  AC_DEFINE_UNQUOTED(AP_LOG_EXEC, "$withval", [SuExec log file] ) ] )
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+  if test "x$withval" = "xyes"; then
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+    AC_DEFINE_UNQUOTED(AP_LOG_EXEC, "$withval", [SuExec log file])
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+  fi
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+])
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+
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+AC_ARG_WITH(suexec-syslog,
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+APACHE_HELP_STRING(--with-suexec-syslog,Set the logfile),[
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+  if test $withval = "yes"; then
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+    if test "x${with_suexec_logfile}" != "xno"; then
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+      AC_MSG_NOTICE([hint: use "--without-suexec-logfile --with-suexec-syslog"])
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+      AC_MSG_ERROR([suexec does not support both logging to file and syslog])
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+    fi
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+    AC_CHECK_FUNCS([vsyslog], [], [
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+       AC_MSG_ERROR([cannot support syslog from suexec without vsyslog()])])
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+    AC_DEFINE(AP_LOG_SYSLOG, 1, [SuExec log to syslog])
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+  fi    
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+])
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+
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 AC_ARG_WITH(suexec-safepath,
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 APACHE_HELP_STRING(--with-suexec-safepath,Set the safepath),[
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@@ -744,6 +761,15 @@ AC_ARG_WITH(suexec-umask,
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 APACHE_HELP_STRING(--with-suexec-umask,umask for suexec'd process),[
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   AC_DEFINE_UNQUOTED(AP_SUEXEC_UMASK, 0$withval, [umask for suexec'd process] ) ] )
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+INSTALL_SUEXEC=setuid
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+AC_ARG_ENABLE([suexec-capabilities], 
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+APACHE_HELP_STRING(--enable-suexec-capabilities,Use Linux capability bits not setuid root suexec), [
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+INSTALL_SUEXEC=caps
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+AC_DEFINE(AP_SUEXEC_CAPABILITIES, 1, 
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+          [Enable if suexec is installed with Linux capabilities, not setuid])
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+])
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+APACHE_SUBST(INSTALL_SUEXEC)
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+
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 dnl APR should go after the other libs, so the right symbols can be picked up
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 if test x${apu_found} != xobsolete; then
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   AP_LIBS="$AP_LIBS `$apu_config --avoid-ldap --link-libtool`"
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--- httpd-2.4.4/docs/manual/suexec.html.en.r1337344+
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+++ httpd-2.4.4/docs/manual/suexec.html.en
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@@ -372,6 +372,21 @@
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       together with the --enable-suexec option to let
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       APACI accept your request for using the suEXEC feature.
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+      
--enable-suexec-capabilities
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+
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+      
Linux specific: Normally,
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+      the suexec binary is installed "setuid/setgid
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+      root", which allows it to run with the full privileges of the
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+      root user.  If this option is used, the suexec
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+      binary will instead be installed with only the setuid/setgid
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+      "capability" bits set, which is the subset of full root
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+      priviliges required for suexec operation.  Note that
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+      the suexec binary may not be able to write to a log
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+      file in this mode; it is recommended that the
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+      --with-suexec-syslog --without-suexec-logfile
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+      options are used in conjunction with this mode, so that syslog
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+      logging is used instead.
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+
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--with-suexec-bin=PATH
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The path to the suexec binary must be hard-coded
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@@ -433,6 +448,12 @@
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       "suexec_log" and located in your standard logfile
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       directory (--logfiledir).
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+      
--with-suexec-syslog
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+
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+      
If defined, suexec will log notices and errors to syslog
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+      instead of a logfile.  This option must be combined
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+      with --without-suexec-logfile.
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+
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--with-suexec-safepath=PATH
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Define a safe PATH environment to pass to CGI
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@@ -550,9 +571,12 @@ Group webgroup
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The suEXEC wrapper will write log information

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     to the file defined with the --with-suexec-logfile
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-    option as indicated above. If you feel you have configured and
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-    installed the wrapper properly, have a look at this log and the
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-    error_log for the server to see where you may have gone astray.

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+    option as indicated above, or to syslog if --with-suexec-syslog
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+    is used. If you feel you have configured and
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+    installed the wrapper properly, have a look at the log and the
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+    error_log for the server to see where you may have gone astray. 
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+    The output of "suexec -V" will show the options
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+    used to compile suexec, if using a binary distribution.

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top
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@@ -640,4 +664,4 @@ if (typeof(prettyPrint) !== 'undefined')
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     prettyPrint();
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 }
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 //--></script>
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-</body></html>
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\ No newline at end of file
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+</body></html>
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--- httpd-2.4.4/Makefile.in.r1337344+
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+++ httpd-2.4.4/Makefile.in
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@@ -238,11 +238,22 @@ install-man:
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 	  cd $(DESTDIR)$(manualdir) && find . -name ".svn" -type d -print | xargs rm -rf 2>/dev/null || true; \
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 	fi
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-install-suexec:
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+install-suexec: install-suexec-binary install-suexec-$(INSTALL_SUEXEC)
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+
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+install-suexec-binary:
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 	@if test -f $(builddir)/support/suexec; then \
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             test -d $(DESTDIR)$(sbindir) || $(MKINSTALLDIRS) $(DESTDIR)$(sbindir); \
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             $(INSTALL_PROGRAM) $(top_builddir)/support/suexec $(DESTDIR)$(sbindir); \
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-            chmod 4755 $(DESTDIR)$(sbindir)/suexec; \
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+	fi
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+
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+install-suexec-setuid:
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+	@if test -f $(builddir)/support/suexec; then \
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+	    chmod 4755 $(DESTDIR)$(sbindir)/suexec; \
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+	fi
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+
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+install-suexec-caps:
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+	@if test -f $(builddir)/support/suexec; then \
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+            setcap 'cap_setuid,cap_setgid+pe' $(DESTDIR)$(sbindir)/suexec; \
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 	fi
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 suexec:
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--- httpd-2.4.4/modules/arch/unix/mod_unixd.c.r1337344+
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+++ httpd-2.4.4/modules/arch/unix/mod_unixd.c
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@@ -284,6 +284,13 @@ unixd_set_suexec(cmd_parms *cmd, void *d
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     return NULL;
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 }
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+#ifdef AP_SUEXEC_CAPABILITIES
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+/* If suexec is using capabilities, don't test for the setuid bit. */
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+#define SETUID_TEST(finfo) (1)
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+#else
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+#define SETUID_TEST(finfo) (finfo.protection & APR_USETID)
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+#endif
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+
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 static int
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 unixd_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
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                  apr_pool_t *ptemp)
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@@ -300,7 +307,7 @@ unixd_pre_config(apr_pool_t *pconf, apr_
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     ap_unixd_config.suexec_enabled = 0;
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     if ((apr_stat(&wrapper, SUEXEC_BIN, APR_FINFO_NORM, ptemp))
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          == APR_SUCCESS) {
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-        if ((wrapper.protection & APR_USETID) && wrapper.user == 0
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+        if (SETUID_TEST(wrapper) && wrapper.user == 0
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             && (access(SUEXEC_BIN, R_OK|X_OK) == 0)) {
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             ap_unixd_config.suexec_enabled = 1;
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             ap_unixd_config.suexec_disabled_reason = "";
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--- httpd-2.4.4/support/suexec.c.r1337344+
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+++ httpd-2.4.4/support/suexec.c
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@@ -58,6 +58,10 @@
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 #include <grp.h>
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 #endif
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+#ifdef AP_LOG_SYSLOG
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+#include <syslog.h>
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+#endif
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+
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 #if defined(PATH_MAX)
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 #define AP_MAXPATH PATH_MAX
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 #elif defined(MAXPATHLEN)
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@@ -69,7 +73,20 @@
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 #define AP_ENVBUF 256
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 extern char **environ;
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+
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+#ifdef AP_LOG_SYSLOG
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+/* Syslog support. */
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+#if !defined(AP_LOG_FACILITY) && defined(LOG_AUTHPRIV)
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+#define AP_LOG_FACILITY LOG_AUTHPRIV
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+#elif !defined(AP_LOG_FACILITY)
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+#define AP_LOG_FACILITY LOG_AUTH
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+#endif
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+
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+static int log_open;
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+#else
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+/* Non-syslog support. */
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 static FILE *log = NULL;
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+#endif
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 static const char *const safe_env_lst[] =
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 {
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@@ -137,7 +154,14 @@ static void err_output(int is_error, con
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 static void err_output(int is_error, const char *fmt, va_list ap)
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 {
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-#ifdef AP_LOG_EXEC
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+#if defined(AP_LOG_SYSLOG)
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+    if (!log_open) {
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+        openlog("suexec", LOG_PID, AP_LOG_FACILITY);
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+        log_open = 1;
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+    }
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+
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+    vsyslog(is_error ? LOG_ERR : LOG_INFO, fmt, ap);
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+#elif defined(AP_LOG_EXEC)
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     time_t timevar;
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     struct tm *lt;
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@@ -295,7 +319,9 @@ int main(int argc, char *argv[])
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 #ifdef AP_HTTPD_USER
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         fprintf(stderr, " -D AP_HTTPD_USER=\"%s\"\n", AP_HTTPD_USER);
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 #endif
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-#ifdef AP_LOG_EXEC
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+#if defined(AP_LOG_SYSLOG)
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+        fprintf(stderr, " -D AP_LOG_SYSLOG\n");
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+#elif defined(AP_LOG_EXEC)
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         fprintf(stderr, " -D AP_LOG_EXEC=\"%s\"\n", AP_LOG_EXEC);
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 #endif
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 #ifdef AP_SAFE_PATH
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@@ -591,6 +617,12 @@ int main(int argc, char *argv[])
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 #endif /* AP_SUEXEC_UMASK */
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     /* Be sure to close the log file so the CGI can't mess with it. */
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+#ifdef AP_LOG_SYSLOG
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+    if (log_open) {
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+        closelog();
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+        log_open = 0;
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+    }
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+#else
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     if (log != NULL) {
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 #if APR_HAVE_FCNTL_H
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         /*
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@@ -612,6 +644,7 @@ int main(int argc, char *argv[])
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         log = NULL;
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 #endif
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     }
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+#endif
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     /*
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      * Execute the command, replacing our image with its own.