contrib/openpam/lib/pam_setenv.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * Copyright (c) 2004-2011 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_setenv.c 539 2012-03-31 20:53:22Z des $
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 # include "config.h"
  40 #endif
  41
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45
  46 #include <security/pam_appl.h>
  47
  48 #include "openpam_impl.h"
  49
  50 /*
  51  * OpenPAM extension
  52  *
  53  * Set the value of an environment variable
  54  * Mirrors setenv(3)
  55  */
  56
  57 int
  58 pam_setenv(pam_handle_t *pamh,
  59         const char *name,
  60         const char *value,
  61         int overwrite)
  62 {
  63         char *env;
  64         int r;
  65
  66         ENTER();
  67         if (pamh == NULL)
  68                 RETURNC(PAM_SYSTEM_ERR);
  69
  70         /* sanity checks */
  71         if (name == NULL || value == NULL || strchr(name, '=') != NULL)
  72                 RETURNC(PAM_SYSTEM_ERR);
  73
  74         /* is it already there? */
  75         if (!overwrite && openpam_findenv(pamh, name, strlen(name)) >= 0)
  76                 RETURNC(PAM_SUCCESS);
  77
  78         /* set it... */
  79         if (asprintf(&env, "%s=%s", name, value) < 0)
  80                 RETURNC(PAM_BUF_ERR);
  81         r = pam_putenv(pamh, env);
  82         FREE(env);
  83         RETURNC(r);
  84 }
  85
  86 /*
  87  * Error codes:
  88  *
  89  *      =pam_putenv
  90  *      PAM_SYSTEM_ERR
  91  *      PAM_BUF_ERR
  92  */
  93
  94 /**
  95  * The =pam_setenv function sets an environment variable.
  96  * Its semantics are similar to those of =setenv, but it modifies the PAM
  97  * context's environment list instead of the application's.
  98  *
  99  * >pam_getenv
 100  * >pam_getenvlist
 101  * >pam_putenv
 102  */