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      1 /*	$NetBSD: openpam_get_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
      5  * Copyright (c) 2004-2011 Dag-Erling Smrgrav
      6  * All rights reserved.
      7  *
      8  * This software was developed for the FreeBSD Project by ThinkSec AS and
      9  * Network Associates Laboratories, the Security Research Division of
     10  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
     11  * ("CBOSS"), as part of the DARPA CHATS research program.
     12  *
     13  * Redistribution and use in source and binary forms, with or without
     14  * modification, are permitted provided that the following conditions
     15  * are met:
     16  * 1. Redistributions of source code must retain the above copyright
     17  *    notice, this list of conditions and the following disclaimer.
     18  * 2. Redistributions in binary form must reproduce the above copyright
     19  *    notice, this list of conditions and the following disclaimer in the
     20  *    documentation and/or other materials provided with the distribution.
     21  * 3. The name of the author may not be used to endorse or promote
     22  *    products derived from this software without specific prior written
     23  *    permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 
     38 #ifdef HAVE_CONFIG_H
     39 # include "config.h"
     40 #endif
     41 
     42 #include <sys/cdefs.h>
     43 __RCSID("$NetBSD: openpam_get_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $");
     44 
     45 #include <sys/param.h>
     46 
     47 #include <string.h>
     48 
     49 #include <security/pam_appl.h>
     50 
     51 #include "openpam_impl.h"
     52 
     53 /*
     54  * OpenPAM extension
     55  *
     56  * Returns the value of a module option
     57  */
     58 
     59 const char *
     60 openpam_get_option(pam_handle_t *pamh,
     61 	const char *option)
     62 {
     63 	pam_chain_t *cur;
     64 	size_t len;
     65 	int i;
     66 
     67 	ENTERS(option);
     68 	if (pamh == NULL || pamh->current == NULL || option == NULL)
     69 		RETURNS(NULL);
     70 	cur = pamh->current;
     71 	len = strlen(option);
     72 	for (i = 0; i < cur->optc; ++i) {
     73 		if (strncmp(cur->optv[i], option, len) == 0) {
     74 			if (cur->optv[i][len] == '\0')
     75 				RETURNS(&cur->optv[i][len]);
     76 			else if (cur->optv[i][len] == '=')
     77 				RETURNS(&cur->optv[i][len + 1]);
     78 		}
     79 	}
     80 	RETURNS(NULL);
     81 }
     82 
     83 /**
     84  * The =openpam_get_option function returns the value of the specified
     85  * option in the context of the currently executing service module, or
     86  * =NULL if the option is not set or no module is currently executing.
     87  *
     88  * >openpam_set_option
     89  */
     90