6 files changed, 29 insertions, 20 deletions

diff --git a/ChangeLog b/ChangeLog
index 7dfcb45e5..7c30a33ac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -38,6 +38,10 @@
      [sshd.c]
      call get_remote_ipaddr() early; fixes logging after client disconnects;
      report mpf@; ok dtucker@
+   - markus@cvs.openbsd.org 2006/06/06 10:20:20
+     [readpass.c sshconnect.c sshconnect.h sshconnect2.c uidswap.c]
+     replace remaining setuid() calls with permanently_set_uid() and
+     check seteuid() return values; report Marcus Meissner; ok dtucker djm
 
 20060521
  - (dtucker) [auth.c monitor.c] Now that we don't log from both the monitor
@@ -4671,4 +4675,4 @@
    - (djm) Trim deprecated options from INSTALL. Mention UsePAM
    - (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
 
-$Id: ChangeLog,v 1.4340 2006/06/13 03:03:53 djm Exp $
+$Id: ChangeLog,v 1.4341 2006/06/13 03:05:15 djm Exp $
diff --git a/readpass.c b/readpass.c
index c3d36a028..60e4a902f 100644
--- a/readpass.c
+++ b/readpass.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readpass.c,v 1.37 2006/03/25 13:17:02 djm Exp $ */
+/* $OpenBSD: readpass.c,v 1.38 2006/06/06 10:20:20 markus Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -37,6 +37,7 @@
 #include "pathnames.h"
 #include "log.h"
 #include "ssh.h"
+#include "uidswap.h"
 
 static char *
 ssh_askpass(char *askpass, const char *msg)
@@ -60,8 +61,7 @@ ssh_askpass(char *askpass, const char *msg)
                 return NULL;
         }
         if (pid == 0) {
-                seteuid(getuid());
-                setuid(getuid());
+                permanently_set_uid(getpwuid(getuid()));
                 close(p[0]);
                 if (dup2(p[1], STDOUT_FILENO) < 0)
                         fatal("ssh_askpass: dup2: %s", strerror(errno));
diff --git a/sshconnect.c b/sshconnect.c
index e855f1926..41ad82f9f 100644
--- a/sshconnect.c
+++ b/sshconnect.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect.c,v 1.182 2006/05/17 12:43:34 markus Exp $ */
+/* $OpenBSD: sshconnect.c,v 1.183 2006/06/06 10:20:20 markus Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -97,8 +97,7 @@ ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)
                 char *argv[10];
 
                 /* Child.  Permanently give up superuser privileges. */
-                seteuid(original_real_uid);
-                setuid(original_real_uid);
+                permanently_set_uid(getpwuid(original_real_uid));
 
                 /* Redirect stdin and stdout. */
                 close(pin[1]);
diff --git a/sshconnect.h b/sshconnect.h
index 3786ba56e..692d27567 100644
--- a/sshconnect.h
+++ b/sshconnect.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect.h,v 1.19 2006/03/25 22:22:43 djm Exp $ */
+/* $OpenBSD: sshconnect.h,v 1.20 2006/06/06 10:20:20 markus Exp $ */
 
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
@@ -54,16 +54,20 @@ int	 ssh_local_cmd(const char *);
 /*
  * Macros to raise/lower permissions.
  */
-#define PRIV_START do {                         \
-        int save_errno = errno;                 \
-        (void)seteuid(original_effective_uid);  \
-        errno = save_errno;                     \
+#define PRIV_START do {                                 \
+        int save_errno = errno;                         \
+        if (seteuid(original_effective_uid) != 0)       \
+                fatal("PRIV_START: seteuid: %s",        \
+                    strerror(errno));                   \
+        errno = save_errno;                             \
 } while (0)
 
-#define PRIV_END do {                           \
-        int save_errno = errno;                 \
-        (void)seteuid(original_real_uid);       \
-        errno = save_errno;                     \
+#define PRIV_END do {                                   \
+        int save_errno = errno;                         \
+        if (seteuid(original_real_uid) != 0)            \
+                fatal("PRIV_END: seteuid: %s",          \
+                    strerror(errno));                   \
+        errno = save_errno;                             \
 } while (0)
 
 #endif
diff --git a/sshconnect2.c b/sshconnect2.c
index 53cf25762..c97738c7b 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect2.c,v 1.153 2006/05/08 10:49:48 djm Exp $ */
+/* $OpenBSD: sshconnect2.c,v 1.154 2006/06/06 10:20:20 markus Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  *
@@ -53,6 +53,7 @@
 #include "canohost.h"
 #include "msg.h"
 #include "pathnames.h"
+#include "uidswap.h"
 
 #ifdef GSSAPI
 #include "ssh-gss.h"
@@ -1252,8 +1253,7 @@ ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
                 return -1;
         }
         if (pid == 0) {
-                seteuid(getuid());
-                setuid(getuid());
+                permanently_set_uid(getpwuid(getuid()));
                 close(from[0]);
                 if (dup2(from[1], STDOUT_FILENO) < 0)
                         fatal("ssh_keysign: dup2: %s", strerror(errno));
diff --git a/uidswap.c b/uidswap.c
index 6dc1680db..ba2d20942 100644
--- a/uidswap.c
+++ b/uidswap.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: uidswap.c,v 1.27 2006/04/22 04:06:51 djm Exp $ */
+/* $OpenBSD: uidswap.c,v 1.28 2006/06/06 10:20:20 markus Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -169,6 +169,8 @@ permanently_set_uid(struct passwd *pw)
         uid_t old_uid = getuid();
         gid_t old_gid = getgid();
 
+        if (pw == NULL)
+                fatal("permanently_set_uid: no user given");
         if (temporarily_use_uid_effective)
                 fatal("permanently_set_uid: temporarily_use_uid effective");
         debug("permanently_set_uid: %u/%u", (u_int)pw->pw_uid,