sudo/sudo-1.7.2p1-audit.patch

diff -up /dev/null sudo-1.7.2p1/audit_help.c
--- /dev/null	2009-09-09 14:57:12.384002457 +0200
+++ sudo-1.7.2p1/audit_help.c	2009-10-30 12:25:49.000000000 +0100
@@ -0,0 +1,136 @@
+/*
+ *  Audit helper functions used throughout sudo
+ *
+ *  Copyright (C) 2007, Red Hat, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ifdef WITH_AUDIT
+#include <stdlib.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include <libaudit.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#ifdef HAVE_SELINUX
+#include <selinux/selinux.h>
+#endif
+
+int audit_fd = -1;
+
+void audit_help_open (void)
+{
+	audit_fd = audit_open ();
+	if (audit_fd < 0) {
+        	/* You get these only when the kernel doesn't have
+                 * audit compiled in. */
+		if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+		    errno == EAFNOSUPPORT)
+			return;
+		fprintf (stderr, "Cannot open audit interface - aborting.\n");
+		exit (1);
+	}
+}
+
+/*
+ * This function will log a message to the audit system using a predefined
+ * message format. Parameter usage is as follows:
+ *
+ * type - type of message: AUDIT_USER_CMD
+ * command - the command being logged
+ * params - parames of the command
+ * result - 1 is "success" and 0 is "failed"
+ *
+ */
+void audit_logger (int type, const char *command, const char *params, int result)
+{
+	int err;
+	char *msg;
+
+	if( audit_fd < 0 )
+		return;
+	else {
+
+		if( params ) 
+	                err = asprintf(&msg, "%s %s", command, params);
+		else 
+	                err = asprintf(&msg, "%s", command);
+                if (err < 0) {
+                        fprintf (stderr, "Memory allocation for audit message wasn’t possible.\n");
+                        return;
+                }
+		
+		err = audit_log_user_command (audit_fd, type, msg, NULL, result);
+               /* The kernel supports auditing and we had 
+                  enough privilege to write to the socket. */
+		if( err <= 0 && !((errno == EPERM && getuid() > 0) || errno == ECONNREFUSED ) ) {
+			perror("audit_log_user_command()");
+		}
+
+		free(msg);
+	}
+}
+
+#ifdef HAVE_SELINUX
+int send_audit_message(int success, security_context_t old_context,
+                       security_context_t new_context, const char *ttyn)
+{
+        char *msg = NULL;
+        int rc;
+
+        if (audit_fd < 0)
+                return -1;
+
+        if (asprintf(&msg, "newrole: old-context=%s new-context=%s",
+                     old_context ? old_context : "?",
+                     new_context ? new_context : "?") < 0) {
+                fprintf(stderr, "Error allocating memory.\n");
+                rc = -1;
+                goto out;
+        }
+
+        rc = audit_log_user_message(audit_fd, AUDIT_USER_ROLE_CHANGE,
+                                    msg, NULL, NULL, ttyn, success);
+
+        if (rc <= 0) {
+                fprintf(stderr, "Error sending audit message.\n");
+                rc = -1;
+                goto out;
+        }
+        rc = 0;
+
+        out:
+         free(msg);
+         return rc;
+}
+#endif
+#endif                         /* WITH_AUDIT */
diff -up sudo-1.7.2p1/configure.in.audit sudo-1.7.2p1/configure.in
--- sudo-1.7.2p1/configure.in.audit	2009-10-30 12:25:49.000000000 +0100
+++ sudo-1.7.2p1/configure.in	2009-10-30 12:25:49.000000000 +0100
@@ -180,6 +180,10 @@ dnl
 dnl Options for --with
 dnl
 
+AC_ARG_WITH(audit,
+        [AC_HELP_STRING([--with-audit], [use auditing support @<:@default=yes if found@:>@])],
+        [with_audit=$withval], [with_audit=yes])
+
 AC_ARG_WITH(CC, [AS_HELP_STRING([--with-CC], [C compiler to use])],
 [case $with_CC in
     yes)	AC_MSG_ERROR(["must give --with-CC an argument."])
@@ -1743,6 +1747,24 @@ dnl
 : ${mansectsu='8'}
 : ${mansectform='5'}
 
+AC_SUBST(LIBAUDIT)
+if test "$with_audit" = "yes"; then
+	# See if we have the audit library
+        AC_CHECK_HEADER(libaudit.h, [audit_header="yes"], [audit_header="no"])
+        if test "$audit_header" = "yes"; then
+                AC_CHECK_LIB(audit, audit_log_user_command,
+                        [AC_DEFINE(WITH_AUDIT, 1, [Define if you want to enable Audit messages])
+                        LIBAUDIT="-laudit"])
+        fi
+	# See if we have the libcap library
+	AC_CHECK_HEADERS(sys/capability.h sys/prctl.h, [cap_header="yes"], [cap_header="no"])
+	if test "$cap_header" = "yes"; then
+		AC_CHECK_LIB(cap, cap_init,
+			[AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
+			SUDO_LIBS="${SUDO_LIBS} -lcap"])
+	fi
+fi
+
 dnl
 dnl Add in any libpaths or libraries specified via configure
 dnl
diff -up sudo-1.7.2p1/Makefile.in.audit sudo-1.7.2p1/Makefile.in
--- sudo-1.7.2p1/Makefile.in.audit	2009-10-30 12:25:49.000000000 +0100
+++ sudo-1.7.2p1/Makefile.in	2009-10-30 12:25:49.000000000 +0100
@@ -125,6 +125,8 @@ HDRS = bsm_audit.h compat.h def_data.h d
 
 AUTH_OBJS = sudo_auth.o @AUTH_OBJS@
 
+AUDIT_OBJS = audit_help.o
+
 # Note: gram.o must come first here
 COMMON_OBJS = gram.o alias.o alloc.o defaults.o error.o list.o match.o \
 	      toke.o redblack.o zero_bytes.o @NONUNIX_GROUPS_IMPL@
@@ -132,7 +134,7 @@ COMMON_OBJS = gram.o alias.o alloc.o def
 SUDO_OBJS = $(COMMON_OBJS) $(AUTH_OBJS) @SUDO_OBJS@ audit.o check.o env.o \
 	    getspwuid.o gettime.o goodpath.o fileops.o find_path.o \
 	    interfaces.o lbuf.o logging.o parse.o pwutil.o set_perms.o \
-	    sudo.o sudo_edit.o sudo_nss.o term.o tgetpass.o
+	    sudo.o sudo_edit.o sudo_nss.o term.o tgetpass.o $(AUDIT_OBJS)
 
 VISUDO_OBJS = $(COMMON_OBJS) visudo.o fileops.o gettime.o goodpath.o \
 	      find_path.o pwutil.o
@@ -363,6 +365,9 @@ securid5.o: $(authdir)/securid5.c $(AUTH
 sia.o: $(authdir)/sia.c $(AUTHDEP)
 	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(DEFS) $(OPTIONS) $(authdir)/sia.c
 
+audit_help.o: audit_help.c sudo.h
+	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(DEFS) $(OPTIONS) $(LIBADUIT) $(srcdir)/audit_help.c
+
 sudo.man.in: $(srcdir)/sudo.pod
 	@rm -f $(srcdir)/$@
 	( cd $(srcdir); mansectsu=`echo @MANSECTSU@|tr A-Z a-z`; mansectform=`echo @MANSECTFORM@|tr A-Z a-z`; sed -n -e '/^=pod/q' -e 's/^/.\\" /p' sudo.pod > $@; pod2man --quotes=none --date="`date '+%B %e, %Y'`" --section=$$mansectsu --release=$(VERSION) --center="MAINTENANCE COMMANDS" sudo.pod | sed -e "s/(5)/($$mansectform)/" -e "s/(8)/($$mansectsu)/" | perl -p sudo.man.pl >> $@ )
diff -up sudo-1.7.2p1/set_perms.c.audit sudo-1.7.2p1/set_perms.c
--- sudo-1.7.2p1/set_perms.c.audit	2009-06-25 14:44:33.000000000 +0200
+++ sudo-1.7.2p1/set_perms.c	2009-10-30 12:32:03.000000000 +0100
@@ -48,6 +48,10 @@
 #ifdef HAVE_LOGIN_CAP_H
 # include <login_cap.h>
 #endif
+#if defined(WITH_AUDIT) && defined(HAVE_LIBCAP)
+# include <sys/prctl.h>
+# include <sys/capability.h>
+#endif
 
 #include "sudo.h"
 
@@ -130,16 +134,59 @@ set_perms(perm)
 			      	break;
 
 	case PERM_FULL_RUNAS:
-				/* headed for exec(), assume euid == ROOT_UID */
-				runas_setup();
-				if (setresuid(def_stay_setuid ?
-				    user_uid : runas_pw->pw_uid,
-				    runas_pw->pw_uid, runas_pw->pw_uid)) {
-				    errstr = "unable to change to runas uid";
-				    goto bad;
-				}
+#if defined(WITH_AUDIT) && defined(HAVE_LIBCAP)
+	                     { /* BEGIN CAP BLOCK */
+				  cap_t new_caps;
+				  cap_value_t cap_list[] = { CAP_AUDIT_WRITE };
+				  
+				  if (runas_pw->pw_uid != ROOT_UID) {
+				       new_caps = cap_init ();
+				       if (!new_caps) {
+					    errstr = "Error initing capabilities, aborting.\n";
+					    goto bad;
+				       }
+				       
+				       if(cap_set_flag(new_caps, CAP_PERMITTED, 1, cap_list, CAP_SET) ||
+					  cap_set_flag(new_caps, CAP_EFFECTIVE, 1, cap_list, CAP_SET)) {
+					    errstr = "Error setting capabilities, aborting\n";
+					    goto bad;
+				       }
+				       
+				       if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0)) {
+					    errstr = "Error setting KEEPCAPS, aborting\n";
+					    goto bad;
+				       }
+				  }
+#endif
+				  /* headed for exec(), assume euid == ROOT_UID */
+				  runas_setup();
+				  if (setresuid(def_stay_setuid ?
+						user_uid : runas_pw->pw_uid,
+						runas_pw->pw_uid, runas_pw->pw_uid)) {
+				       errstr = "unable to change to runas uid";
+				       goto bad;
+				  }
+				  
+#if defined(WITH_AUDIT) && defined(HAVE_LIBCAP)
+				  if (runas_pw->pw_uid != ROOT_UID) {
+				       if (prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0) < 0) {
+					    errstr = "Error resetting KEEPCAPS, aborting\n";
+					    goto bad;
+				       }
+				       
+				       if (cap_set_proc(new_caps)) {
+					    errstr = "Error dropping capabilities, aborting\n";
+					    goto bad;
+				       }
+				       
+				       if (cap_free (new_caps)) {
+					    errstr = "Error freeing caps\n";
+					    goto bad;
+				       }
+				  }
+                                } /* END CAP BLOCK */
+#endif
 				break;
-
 	case PERM_SUDOERS:
 				/* assume euid == ROOT_UID, ruid == user */
 				if (setresgid(-1, SUDOERS_GID, -1))
diff -up sudo-1.7.2p1/sudo.c.audit sudo-1.7.2p1/sudo.c
--- sudo-1.7.2p1/sudo.c.audit	2009-10-30 12:25:49.000000000 +0100
+++ sudo-1.7.2p1/sudo.c	2009-10-30 12:25:49.000000000 +0100
@@ -95,6 +95,10 @@
 # include <selinux/selinux.h>
 #endif
 
+#ifdef WITH_AUDIT
+#include <libaudit.h>
+#endif
+
 #include <sudo_usage.h>
 #include "sudo.h"
 #include "lbuf.h"
@@ -372,7 +376,7 @@ main(argc, argv, envp)
 
     if (safe_cmnd == NULL)
 	safe_cmnd = estrdup(user_cmnd);
-
+    
 #ifdef HAVE_SETLOCALE
     setlocale(LC_ALL, "");
 #endif
@@ -538,12 +542,26 @@ main(argc, argv, envp)
 	(void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
 	(void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
 
+	closefrom(def_closefrom + 1);
+	
+#if defined(WITH_AUDIT)
+        audit_help_open ();
+#endif
+        if (access(safe_cmnd, X_OK) != 0) {
+		warn ("unable to execute %s", safe_cmnd);
+#ifdef WITH_AUDIT
+		audit_logger(AUDIT_USER_CMD,  safe_cmnd, user_args, 0);
+#endif
+		exit(127);
+        }
+#ifdef WITH_AUDIT
+        audit_logger(AUDIT_USER_CMD, safe_cmnd, user_args, 1);
+#endif
+	
 	/* Close the password and group files and free up memory. */
 	sudo_endpwent();
 	sudo_endgrent();
 
-	closefrom(def_closefrom + 1);
-
 #ifndef PROFILING
 	if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0) {
 	    syslog(LOG_AUTH|LOG_ERR, "fork");
@@ -568,11 +586,17 @@ main(argc, argv, envp)
 	    NewArgv[1] = safe_cmnd;
 	    execv(_PATH_BSHELL, NewArgv);
 	}
+#ifdef WITH_AUDIT
+	audit_logger(AUDIT_USER_CMD,  safe_cmnd, user_args, 0);
+#endif
 	warning("unable to execute %s", safe_cmnd);
 	exit(127);
     } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
 	audit_failure(NewArgv, "No user or host");
 	log_denial(validated, 1);
+#ifdef WITH_AUDIT
+	audit_logger(AUDIT_USER_CMD,  safe_cmnd, user_args, 0);
+#endif
 	exit(1);
     } else {
 	if (def_path_info) {
@@ -594,6 +618,9 @@ main(argc, argv, envp)
 	    log_denial(validated, 1);
 	}
 	audit_failure(NewArgv, "validation failure");
+#ifdef WITH_AUDIT
+	audit_logger(AUDIT_USER_CMD,  safe_cmnd, user_args, 0);
+#endif
 	exit(1);
     }
     exit(0);	/* not reached */
diff -up sudo-1.7.2p1/sudo.h.audit sudo-1.7.2p1/sudo.h
--- sudo-1.7.2p1/sudo.h.audit	2009-10-30 12:25:49.000000000 +0100
+++ sudo-1.7.2p1/sudo.h	2009-10-30 12:39:16.000000000 +0100
@@ -24,6 +24,8 @@
 #ifndef _SUDO_SUDO_H
 #define _SUDO_SUDO_H
 
+#include <config.h>
+
 #include <pathnames.h>
 #include <limits.h>
 #include "compat.h"
@@ -340,4 +342,14 @@ extern int sudo_mode;
 extern int errno;
 #endif
 
+#ifdef WITH_AUDIT
+extern int audit_fd;
+extern void audit_help_open (void);
+extern void audit_logger (int, const char *, const char *, int);
+#ifdef HAVE_SELINUX
+# include <selinux/selinux.h>
+extern int send_audit_message(int, security_context_t, security_context_t, const char *);
+#endif /* HAVE_SELINUX */
+#endif /* WITH_AUDIT */
+
 #endif /* _SUDO_SUDO_H */