dist/openpam/lib/pam_getenv.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * Copyright (c) 2004-2007 Dag-Erling Smørgrav
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by ThinkSec AS and
   7  * Network Associates Laboratories, the Security Research Division of
   8  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   9  * ("CBOSS"), as part of the DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * $Id: pam_getenv.c,v 1.3 2008/01/27 01:23:00 christos Exp $
  36  */
  37
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 #include <security/pam_appl.h>
  42
  43 #include "openpam_impl.h"
  44
  45 /*
  46  * XSSO 4.2.1
  47  * XSSO 6 page 44
  48  *
  49  * Retrieve the value of a PAM environment variable
  50  */
  51
  52 const char *
  53 pam_getenv(pam_handle_t *pamh,
  54         const char *name)
  55 {
  56         char *str;
  57         int i;
  58
  59         ENTERS(name);
  60         if (pamh == NULL)
  61                 RETURNS(NULL);
  62         if (name == NULL || strchr(name, '=') != NULL)
  63                 RETURNS(NULL);
  64         if ((i = openpam_findenv(pamh, name, strlen(name))) < 0)
  65                 RETURNS(NULL);
  66         for (str = pamh->env[i]; *str != '\0'; ++str) {
  67                 if (*str == '=') {
  68                         ++str;
  69                         break;
  70                 }
  71         }
  72         RETURNS(str);
  73         /*NOTREACHED*/
  74 }
  75
  76 /**
  77  * The =pam_getenv function returns the value of an environment variable.
  78  * Its semantics are similar to those of =getenv, but it accesses the PAM
  79  * context's environment list instead of the application's.
  80  *
  81  * >pam_getenvlist
  82  * >pam_putenv
  83  * >pam_setenv
  84  */