contrib/openpam/lib/pam_getenvlist.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by ThinkSec AS and
   6  * Network Associates Laboratories, the Security Research Division of
   7  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   8  * ("CBOSS"), as part of the DARPA CHATS research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $P4: //depot/projects/openpam/lib/pam_getenvlist.c#13 $
  35  */
  36
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <security/pam_appl.h>
  41
  42 #include "openpam_impl.h"
  43
  44 /*
  45  * XSSO 4.2.1
  46  * XSSO 6 page 45
  47  *
  48  * Returns a list of all the PAM environment variables
  49  */
  50
  51 char **
  52 pam_getenvlist(pam_handle_t *pamh)
  53 {
  54         char **envlist;
  55         int i;
  56
  57         ENTER();
  58         if (pamh == NULL)
  59                 RETURNP(NULL);
  60         envlist = malloc(sizeof(char *) * (pamh->env_count + 1));
  61         if (envlist == NULL) {
  62                 openpam_log(PAM_LOG_ERROR, "%s",
  63                         pam_strerror(pamh, PAM_BUF_ERR));
  64                 RETURNP(NULL);
  65         }
  66         for (i = 0; i < pamh->env_count; ++i) {
  67                 if ((envlist[i] = strdup(pamh->env[i])) == NULL) {
  68                         while (i) {
  69                                 --i;
  70                                 FREE(envlist[i]);
  71                         }
  72                         FREE(envlist);
  73                         openpam_log(PAM_LOG_ERROR, "%s",
  74                                 pam_strerror(pamh, PAM_BUF_ERR));
  75                         RETURNP(NULL);
  76                 }
  77         }
  78         envlist[i] = NULL;
  79         RETURNP(envlist);
  80 }
  81
  82 /**
  83  * The =pam_getenvlist function returns a copy of the given PAM context's
  84  * environment list as a pointer to an array of strings.
  85  * The last element in the array is =NULL.
  86  * The pointer is suitable for assignment to {Va environ}.
  87  *
  88  * The array and the strings it lists are allocated using =malloc, and
  89  * should be released using =free after use:
  90  *
  91  *     char **envlist, **env;
  92  *
  93  *     envlist = environ;
  94  *     environ = pam_getenvlist(pamh);
  95  *     \/\* do something nifty \*\/
  96  *     for (env = environ; *env != NULL; env++)
  97  *         free(*env);
  98  *     free(environ);
  99  *     environ = envlist;
 100  *
 101  * >environ 7
 102  * >pam_getenv
 103  * >pam_putenv
 104  * >pam_setenv
 105  */