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      1 /*	$NetBSD: pam_getenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
      5  * Copyright (c) 2004-2019 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: pam_getenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $");
     44 
     45 #include <errno.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 
     49 #include <security/pam_appl.h>
     50 
     51 #include "openpam_impl.h"
     52 
     53 /*
     54  * XSSO 4.2.1
     55  * XSSO 6 page 44
     56  *
     57  * Retrieve the value of a PAM environment variable
     58  */
     59 
     60 const char *
     61 pam_getenv(pam_handle_t *pamh,
     62 	const char *name)
     63 {
     64 	size_t len;
     65 	int i;
     66 
     67 	ENTERS(name);
     68 	for (len = 0; name[len] != '\0'; ++len) {
     69 		if (name[len] == '=') {
     70 			errno = EINVAL;
     71 			RETURNS(NULL);
     72 		}
     73 	}
     74 	if ((i = openpam_findenv(pamh, name, len)) < 0)
     75 		RETURNS(NULL);
     76 	/* assert(pamh->env[i][len] == '='); */
     77 	RETURNS(pamh->env[i] + len + 1);
     78 }
     79 
     80 /**
     81  * The =pam_getenv function returns the value of an environment variable.
     82  * Its semantics are similar to those of =getenv, but it accesses the PAM
     83  * context's environment list instead of the application's.
     84  *
     85  * >pam_getenvlist
     86  * >pam_putenv
     87  * >pam_setenv
     88  */
     89