contrib/openpam/lib/openpam_get_option.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/openpam_get_option.c#10 $
  35  */
  36
  37 #include <sys/param.h>
  38
  39 #include <string.h>
  40
  41 #include <security/pam_appl.h>
  42 #include <security/openpam.h>
  43
  44 #include "openpam_impl.h"
  45
  46 /*
  47  * OpenPAM extension
  48  *
  49  * Returns the value of a module option
  50  */
  51
  52 const char *
  53 openpam_get_option(pam_handle_t *pamh,
  54         const char *option)
  55 {
  56         pam_chain_t *cur;
  57         size_t len;
  58         int i;
  59
  60         ENTERS(option);
  61         if (pamh == NULL || pamh->current == NULL || option == NULL)
  62                 RETURNS(NULL);
  63         cur = pamh->current;
  64         len = strlen(option);
  65         for (i = 0; i < cur->optc; ++i) {
  66                 if (strncmp(cur->optv[i], option, len) == 0) {
  67                         if (cur->optv[i][len] == '\0')
  68                                 RETURNS(&cur->optv[i][len]);
  69                         else if (cur->optv[i][len] == '=')
  70                                 RETURNS(&cur->optv[i][len + 1]);
  71                 }
  72         }
  73         RETURNS(NULL);
  74 }
  75
  76 /**
  77  * The =openpam_get_option function returns the value of the specified
  78  * option in the context of the currently executing service module, or
  79  * =NULL if the option is not set or no module is currently executing.
  80  *
  81  * >openpam_set_option
  82  */