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      1 /*	$NetBSD: pam_set_item.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) 2004-2017 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_set_item.c,v 1.5 2023/06/30 21:46:21 christos Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/socket.h>
     47 
     48 #include <stdlib.h>
     49 #include <string.h>
     50 
     51 #include <security/pam_appl.h>
     52 
     53 #include "openpam_impl.h"
     54 
     55 /*
     56  * XSSO 4.2.1
     57  * XSSO 6 page 60
     58  *
     59  * Set authentication information
     60  */
     61 
     62 int
     63 pam_set_item(pam_handle_t *pamh,
     64 	int item_type,
     65 	const void *item)
     66 {
     67 	void **slot;
     68 	size_t nsize, osize;
     69 
     70 	ENTERI(item_type);
     71 	slot = &pamh->item[item_type];
     72 	osize = nsize = 0;
     73 	switch ((enum openpam_item_primitives)item_type) {
     74 	case PAM_SERVICE:
     75 		/* set once only, by pam_start() */
     76 		if (*slot != NULL && item != NULL)
     77 			RETURNC(PAM_BAD_ITEM);
     78 		/* FALLTHROUGH */
     79 	case PAM_USER:
     80 	case PAM_AUTHTOK:
     81 	case PAM_OLDAUTHTOK:
     82 	case PAM_TTY:
     83 	case PAM_RHOST:
     84 	case PAM_RUSER:
     85 	case PAM_USER_PROMPT:
     86 	case PAM_AUTHTOK_PROMPT:
     87 	case PAM_OLDAUTHTOK_PROMPT:
     88 	case PAM_HOST:
     89 	case PAM_NUSER:
     90 		if (*slot != NULL)
     91 			osize = strlen(*slot) + 1;
     92 		if (item != NULL)
     93 			nsize = strlen(item) + 1;
     94 		break;
     95 	case PAM_REPOSITORY:
     96 		osize = nsize = sizeof(struct pam_repository);
     97 		break;
     98 	case PAM_CONV:
     99 		osize = nsize = sizeof(struct pam_conv);
    100 		break;
    101 	case PAM_SOCKADDR:
    102 		osize = nsize = sizeof(struct sockaddr_storage);
    103 		break;
    104 	default:
    105 		RETURNC(PAM_BAD_ITEM);
    106 	}
    107 	if (*slot != NULL) {
    108 		memset(*slot, 0xd0, osize);
    109 		FREE(*slot);
    110 	}
    111 	if (item != NULL) {
    112 		if ((*slot = malloc(nsize)) == NULL)
    113 			RETURNC(PAM_BUF_ERR);
    114 		memcpy(*slot, item, nsize);
    115 	} else {
    116 		*slot = NULL;
    117 	}
    118 	RETURNC(PAM_SUCCESS);
    119 }
    120 
    121 /*
    122  * Error codes:
    123  *
    124  *	PAM_BAD_ITEM
    125  *	PAM_BUF_ERR
    126  */
    127 
    128 /**
    129  * The =pam_set_item function sets the item specified by the =item_type
    130  * argument to a copy of the object pointed to by the =item argument.
    131  * The item is stored in the PAM context specified by the =pamh argument.
    132  * See =pam_get_item for a list of recognized item types.
    133  */
    134