contrib/openpam/lib/openpam_get_option.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: openpam_get_option.c 408 2007-12-21 11:36:24Z des $
  36  */
  37
  38 #include <sys/param.h>
  39
  40 #include <string.h>
  41
  42 #include <security/pam_appl.h>
  43 #include <security/openpam.h>
  44
  45 #include "openpam_impl.h"
  46
  47 /*
  48  * OpenPAM extension
  49  *
  50  * Returns the value of a module option
  51  */
  52
  53 const char *
  54 openpam_get_option(pam_handle_t *pamh,
  55         const char *option)
  56 {
  57         pam_chain_t *cur;
  58         size_t len;
  59         int i;
  60
  61         ENTERS(option);
  62         if (pamh == NULL || pamh->current == NULL || option == NULL)
  63                 RETURNS(NULL);
  64         cur = pamh->current;
  65         len = strlen(option);
  66         for (i = 0; i < cur->optc; ++i) {
  67                 if (strncmp(cur->optv[i], option, len) == 0) {
  68                         if (cur->optv[i][len] == '\0')
  69                                 RETURNS(&cur->optv[i][len]);
  70                         else if (cur->optv[i][len] == '=')
  71                                 RETURNS(&cur->optv[i][len + 1]);
  72                 }
  73         }
  74         RETURNS(NULL);
  75 }
  76
  77 /**
  78  * The =openpam_get_option function returns the value of the specified
  79  * option in the context of the currently executing service module, or
  80  * =NULL if the option is not set or no module is currently executing.
  81  *
  82  * >openpam_set_option
  83  */