contrib/openpam/lib/pam_putenv.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_putenv.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 56
  48  *
  49  * Set the value of an environment variable
  50  */
  51
  52 int
  53 pam_putenv(pam_handle_t *pamh,
  54         const char *namevalue)
  55 {
  56         char **env, *p;
  57         int i;
  58
  59         ENTER();
  60         if (pamh == NULL)
  61                 RETURNC(PAM_SYSTEM_ERR);
  62
  63         /* sanity checks */
  64         if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
  65                 RETURNC(PAM_SYSTEM_ERR);
  66
  67         /* see if the variable is already in the environment */
  68         if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) >= 0) {
  69                 if ((p = strdup(namevalue)) == NULL)
  70                         RETURNC(PAM_BUF_ERR);
  71                 FREE(pamh->env[i]);
  72                 pamh->env[i] = p;
  73                 RETURNC(PAM_SUCCESS);
  74         }
  75
  76         /* grow the environment list if necessary */
  77         if (pamh->env_count == pamh->env_size) {
  78                 env = realloc(pamh->env,
  79                     sizeof(char *) * (pamh->env_size * 2 + 1));
  80                 if (env == NULL)
  81                         RETURNC(PAM_BUF_ERR);
  82                 pamh->env = env;
  83                 pamh->env_size = pamh->env_size * 2 + 1;
  84         }
  85
  86         /* add the variable at the end */
  87         if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
  88                 RETURNC(PAM_BUF_ERR);
  89         ++pamh->env_count;
  90         RETURNC(PAM_SUCCESS);
  91 }
  92
  93 /*
  94  * Error codes:
  95  *
  96  *      PAM_SYSTEM_ERR
  97  *      PAM_BUF_ERR
  98  */
  99
 100 /**
 101  * The =pam_putenv function sets a environment variable.
 102  * Its semantics are similar to those of =putenv, but it modifies the PAM
 103  * context's environment list instead of the application's.
 104  *
 105  * >pam_getenv
 106  * >pam_getenvlist
 107  * >pam_setenv
 108  */