system_cmds-336.tar.gz

[apple/system_cmds.git] / at.tproj / privs.h

diff --git a/at.tproj/privs.h b/at.tproj/privs.h
index ae37877e3be4a12dc09ff3e19855879ec2d8e6cd..9c5e39d88279e867707e45ee14eb755b91465198 100644 (file)
--- a/at.tproj/privs.h
+++ b/at.tproj/privs.h
@@ -1,30 +1,6 @@
-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
- * Reserved.  This file contains Original Code and/or Modifications of
- * Original Code as defined in and that are subject to the Apple Public
- * Source License Version 1.0 (the 'License').  You may not use this file
- * except in compliance with the License.  Please obtain a copy of the
- * License at http://www.apple.com/publicsource and read it before using
- * this file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License."
- * 
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * privs.h - header for privileged operations
- * Copyright (c) 1993 by Thomas Koenig
- * All rights reserved.
+/* 
+ *  privs.h - header for privileged operations 
+ *  Copyright (C) 1993  Thomas Koenig

  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions


@@ -38,7 +14,7 @@
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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.
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * IN NO EVENT SHALL THE AUTHOR(S) 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
  * 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


@@ -46,7 +22,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *

- *     $Id: privs.h,v 1.1.1.2 2000/01/11 02:10:05 wsanchez Exp $
+ * $FreeBSD: src/usr.bin/at/privs.h,v 1.8 2001/09/04 16:15:51 ru Exp $

  */
 
 #ifndef _PRIVS_H
  */
 
 #ifndef _PRIVS_H


@@ -54,22 +30,22 @@
 
 #include <unistd.h>
 
 
 #include <unistd.h>
 

-/* Relinquish privileges temporarily for a setuid program
- * with the option of getting them back later.  This is done by swapping
- * the real and effective userid BSD style.  Call RELINQUISH_PRIVS once
- * at the beginning of the main program.  This will cause all operatons
+/* Relinquish privileges temporarily for a setuid or setgid program
+ * with the option of getting them back later.  This is done by
+ * utilizing POSIX saved user and group IDs.  Call RELINQUISH_PRIVS once
+ * at the beginning of the main program.  This will cause all operations

  * to be executed with the real userid.  When you need the privileges
  * to be executed with the real userid.  When you need the privileges

- * of the setuid invocation, call PRIV_START; when you no longer
+ * of the setuid/setgid invocation, call PRIV_START; when you no longer

  * need it, call PRIV_END.  Note that it is an error to call PRIV_START
  * and not PRIV_END within the same function.
  *
  * need it, call PRIV_END.  Note that it is an error to call PRIV_START
  * and not PRIV_END within the same function.
  *

- * Use RELINQUISH_PRIVS_ROOT(a) if your program started out running
+ * Use RELINQUISH_PRIVS_ROOT(a,b) if your program started out running

  * as root, and you want to drop back the effective userid to a
  * and the effective group id to b, with the option to get them back
  * later.
  *
  * If you no longer need root privileges, but those of some other
  * as root, and you want to drop back the effective userid to a
  * and the effective group id to b, with the option to get them back
  * later.
  *
  * If you no longer need root privileges, but those of some other

- * userid, you can call REDUCE_PRIV(a) when your effective
+ * userid/groupid, you can call REDUCE_PRIV(a,b) when your effective

  * is the user's.
  *
  * Problems: Do not use return between PRIV_START and PRIV_END; this
  * is the user's.
  *
  * Problems: Do not use return between PRIV_START and PRIV_END; this


@@ -79,7 +55,7 @@
  * It is NOT safe to call exec(), system() or popen() with a user-
  * supplied program (i.e. without carefully checking PATH and any
  * library load paths) with relinquished privileges; the called program
  * It is NOT safe to call exec(), system() or popen() with a user-
  * supplied program (i.e. without carefully checking PATH and any
  * library load paths) with relinquished privileges; the called program

- * can aquire them just as easily.  Set both effective and real userid
+ * can acquire them just as easily.  Set both effective and real userid

  * to the real userid before calling any of them.
  */
 
  * to the real userid before calling any of them.
  */
 


@@ -88,28 +64,47 @@ extern
 #endif
 uid_t real_uid, effective_uid;
 
 #endif
 uid_t real_uid, effective_uid;
 

+#ifndef MAIN 
+extern
+#endif
+gid_t real_gid, effective_gid;
+

 #define RELINQUISH_PRIVS { \
        real_uid = getuid(); \
        effective_uid = geteuid(); \
 #define RELINQUISH_PRIVS { \
        real_uid = getuid(); \
        effective_uid = geteuid(); \

+       real_gid = getgid(); \
+       effective_gid = getegid(); \
+       setegid(real_gid); \

        seteuid(real_uid); \
 }
 
        seteuid(real_uid); \
 }
 

-#define RELINQUISH_PRIVS_ROOT(a) { \
+#define RELINQUISH_PRIVS_ROOT(a, b) { \

        real_uid = (a); \
        effective_uid = geteuid(); \
        real_uid = (a); \
        effective_uid = geteuid(); \

+       real_gid = (b); \
+       effective_gid = getegid(); \
+       setegid(real_gid); \

        seteuid(real_uid); \
 }
 
 #define PRIV_START { \
        seteuid(real_uid); \
 }
 
 #define PRIV_START { \

-       seteuid(effective_uid);
+       if (seteuid(0)<0) perr("cannot regain privs"); \
+       if (setegid(effective_gid)<0) perr("cannot reset gid"); \
+       if (seteuid(effective_uid)<0) perr("cannot reset uid"); \
+}

 
 

-#define PRIV_END \
-       seteuid(real_uid); \
+#define PRIV_END { \
+       if (seteuid(0)<0) perr("cannot regain privs"); \
+       if (setegid(real_gid)<0) perr("cannot reset gid"); \
+       if (seteuid(real_uid)<0) perr("cannot reset uid"); \

 }
 
 }
 

-#define REDUCE_PRIV(a) { \
-       seteuid(effective_uid); \
-       real_uid = effective_uid = (a); \
-       setuid(real_uid); \
+#define REDUCE_PRIV(a, b) { \
+       PRIV_START \
+       effective_uid = (a); \
+       effective_gid = (b); \
+       setregid((gid_t)-1, effective_gid); \
+       setreuid((uid_t)-1, effective_uid); \
+       PRIV_END \

 }
 #endif
 }
 #endif