contrib/openpam/lib/pam_getenvlist.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_getenvlist.c 408 2007-12-21 11:36:24Z des $
  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 45
  48  *
  49  * Returns a list of all the PAM environment variables
  50  */
  51
  52 char **
  53 pam_getenvlist(pam_handle_t *pamh)
  54 {
  55         char **envlist;
  56         int i;
  57
  58         ENTER();
  59         if (pamh == NULL)
  60                 RETURNP(NULL);
  61         envlist = malloc(sizeof(char *) * (pamh->env_count + 1));
  62         if (envlist == NULL) {
  63                 openpam_log(PAM_LOG_ERROR, "%s",
  64                         pam_strerror(pamh, PAM_BUF_ERR));
  65                 RETURNP(NULL);
  66         }
  67         for (i = 0; i < pamh->env_count; ++i) {
  68                 if ((envlist[i] = strdup(pamh->env[i])) == NULL) {
  69                         while (i) {
  70                                 --i;
  71                                 FREE(envlist[i]);
  72                         }
  73                         FREE(envlist);
  74                         openpam_log(PAM_LOG_ERROR, "%s",
  75                                 pam_strerror(pamh, PAM_BUF_ERR));
  76                         RETURNP(NULL);
  77                 }
  78         }
  79         envlist[i] = NULL;
  80         RETURNP(envlist);
  81 }
  82
  83 /**
  84  * The =pam_getenvlist function returns a copy of the given PAM context's
  85  * environment list as a pointer to an array of strings.
  86  * The last element in the array is =NULL.
  87  * The pointer is suitable for assignment to {Va environ}.
  88  *
  89  * The array and the strings it lists are allocated using =malloc, and
  90  * should be released using =free after use:
  91  *
  92  *     char **envlist, **env;
  93  *
  94  *     envlist = environ;
  95  *     environ = pam_getenvlist(pamh);
  96  *     \/\* do something nifty \*\/
  97  *     for (env = environ; *env != NULL; env++)
  98  *         free(*env);
  99  *     free(environ);
 100  *     environ = envlist;
 101  *
 102  * >environ 7
 103  * >pam_getenv
 104  * >pam_putenv
 105  * >pam_setenv
 106  */