contrib/openpam/lib/openpam_get_option.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: openpam_get_option.c 531 2012-03-31 14:24:37Z des $
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 # include "config.h"
  40 #endif
  41
  42 #include <sys/param.h>
  43
  44 #include <string.h>
  45
  46 #include <security/pam_appl.h>
  47
  48 #include "openpam_impl.h"
  49
  50 /*
  51  * OpenPAM extension
  52  *
  53  * Returns the value of a module option
  54  */
  55
  56 const char *
  57 openpam_get_option(pam_handle_t *pamh,
  58         const char *option)
  59 {
  60         pam_chain_t *cur;
  61         size_t len;
  62         int i;
  63
  64         ENTERS(option);
  65         if (pamh == NULL || pamh->current == NULL || option == NULL)
  66                 RETURNS(NULL);
  67         cur = pamh->current;
  68         len = strlen(option);
  69         for (i = 0; i < cur->optc; ++i) {
  70                 if (strncmp(cur->optv[i], option, len) == 0) {
  71                         if (cur->optv[i][len] == '\0')
  72                                 RETURNS(&cur->optv[i][len]);
  73                         else if (cur->optv[i][len] == '=')
  74                                 RETURNS(&cur->optv[i][len + 1]);
  75                 }
  76         }
  77         RETURNS(NULL);
  78 }
  79
  80 /**
  81  * The =openpam_get_option function returns the value of the specified
  82  * option in the context of the currently executing service module, or
  83  * =NULL if the option is not set or no module is currently executing.
  84  *
  85  * >openpam_set_option
  86  */