contrib/openpam/lib/pam_putenv.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_putenv.c#12 $
  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 56
  47  *
  48  * Set the value of an environment variable
  49  */
  50
  51 int
  52 pam_putenv(pam_handle_t *pamh,
  53         const char *namevalue)
  54 {
  55         char **env, *p;
  56         int i;
  57
  58         ENTER();
  59         if (pamh == NULL)
  60                 RETURNC(PAM_SYSTEM_ERR);
  61
  62         /* sanity checks */
  63         if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
  64                 RETURNC(PAM_SYSTEM_ERR);
  65
  66         /* see if the variable is already in the environment */
  67         if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) >= 0) {
  68                 if ((p = strdup(namevalue)) == NULL)
  69                         RETURNC(PAM_BUF_ERR);
  70                 FREE(pamh->env[i]);
  71                 pamh->env[i] = p;
  72                 RETURNC(PAM_SUCCESS);
  73         }
  74
  75         /* grow the environment list if necessary */
  76         if (pamh->env_count == pamh->env_size) {
  77                 env = realloc(pamh->env,
  78                     sizeof(char *) * (pamh->env_size * 2 + 1));
  79                 if (env == NULL)
  80                         RETURNC(PAM_BUF_ERR);
  81                 pamh->env = env;
  82                 pamh->env_size = pamh->env_size * 2 + 1;
  83         }
  84
  85         /* add the variable at the end */
  86         if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
  87                 RETURNC(PAM_BUF_ERR);
  88         ++pamh->env_count;
  89         RETURNC(PAM_SUCCESS);
  90 }
  91
  92 /*
  93  * Error codes:
  94  *
  95  *      PAM_SYSTEM_ERR
  96  *      PAM_BUF_ERR
  97  */
  98
  99 /**
 100  * The =pam_putenv function sets a environment variable.
 101  * Its semantics are similar to those of =putenv, but it modifies the PAM
 102  * context's environment list instead of the application's.
 103  *
 104  * >pam_getenv
 105  * >pam_getenvlist
 106  * >pam_setenv
 107  */