File 0002-dhcp-4.1.1-paranoia.patch of Package dhcp

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File 0002-dhcp-4.1.1-paranoia.patch of Package dhcp (Revision ce631c21fbafd7dce70b6b065fa59e54)

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From 1561b8cb9bacabc5e6064b84ba7a187bfb97d0ad Mon Sep 17 00:00:00 2001
From: Marius Tomaschewski <mt@suse.de>
Date: Thu, 18 Aug 2011 09:53:00 +0200
Subject: [PATCH] dhcp-4.1.1-paranoia

---
 server/dhcpd.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/server/dhcpd.c b/server/dhcpd.c
index 7dc7dd2..b4c1bef 100644
--- a/server/dhcpd.c
+++ b/server/dhcpd.c
@@ -207,7 +207,11 @@ static void omapi_listener_start (void *foo)
 #if defined (PARANOIA)
 /* to be used in one of two possible scenarios */
 static void setup_chroot (char *chroot_dir) {
-  if (geteuid())
+  /*
+  ** getuid() instead of geteuid(), see
+  ** comment by thomas@suse.de bellow
+  */
+  if (getuid())
     log_fatal ("you must be root to use chroot");
 
   if (chroot(chroot_dir)) {
@@ -413,7 +417,7 @@ main(int argc, char **argv) {
 				log_fatal ("Insufficient memory to %s %s: %s",
 					   "record interface", argv [i],
 					   isc_result_totext (result));
-			strcpy (tmp -> name, argv [i]);
+			strncpy (tmp -> name, argv [i], sizeof(tmp->name)-1);
 			if (interfaces) {
 				interface_reference (&tmp -> next,
 						     interfaces, MDL);
@@ -499,7 +503,15 @@ main(int argc, char **argv) {
 	if (set_user) {
 		struct passwd *tmp_pwd;
 
-		if (geteuid())
+		/*
+		** I query for the real UID and not for the effective UID
+		** just to force the user to run this server as root and
+		** not setting it suid. It should be a paranoia patch and
+		** not a teletubbie patch. *eg*
+		** Note: That the user is still able to set it suid! *zitter*
+		** thomas@suse.de
+		*/
+		if (getuid())
 			log_fatal ("you must be root to set user");
 
 		if (!(tmp_pwd = getpwnam(set_user)))
@@ -517,7 +529,10 @@ main(int argc, char **argv) {
 #define group real_group
 		struct group *tmp_grp;
 
-		if (geteuid())
+		/*
+		** getuid() instead of geteuid(), see above
+		*/
+		if (getuid())
 			log_fatal ("you must be root to set group");
 
 		if (!(tmp_grp = getgrnam(set_group)))
@@ -771,6 +786,7 @@ main(int argc, char **argv) {
 	/* change uid to the specified one */
 
 	if (set_gid) {
+		/* setgroups is done, OK */
 		if (setgroups (0, (void *)0))
 			log_fatal ("setgroups: %m");
 		if (setgid (set_gid))
-- 
1.8.4

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