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      1 /*	$NetBSD: pam_start.c,v 1.5 2025/09/06 12:23:17 riastradh 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: pam_start.c,v 1.5 2025/09/06 12:23:17 riastradh Exp $");
     44 
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <unistd.h>
     48 
     49 #include <security/pam_appl.h>
     50 
     51 #include "openpam_impl.h"
     52 #include "openpam_strlcpy.h"
     53 
     54 
     55 /*
     56  * XSSO 4.2.1
     57  * XSSO 6 page 89
     58  *
     59  * Initiate a PAM transaction
     60  */
     61 
     62 int
     63 pam_start(const char *service,
     64 	const char *user,
     65 	const struct pam_conv *pam_conv,
     66 	pam_handle_t **pamh)
     67 {
     68 	char *hostname = NULL;
     69 	struct pam_handle *ph;
     70 	int r;
     71 	size_t hostname_size;
     72 	long h;
     73 
     74 #ifdef _SC_HOST_NAME_MAX
     75 	h = sysconf(_SC_HOST_NAME_MAX);
     76 #else
     77 	h = -1;
     78 #endif
     79 	hostname_size = (size_t)(h < 10 ? 1024 : h) + 1;
     80 
     81 	ENTER();
     82 	if ((ph = calloc(1, sizeof *ph)) == NULL)
     83 		RETURNC(PAM_BUF_ERR);
     84 	if ((r = pam_set_item(ph, PAM_SERVICE, service)) != PAM_SUCCESS)
     85 		goto fail;
     86 	if ((hostname = malloc(hostname_size)) == NULL)
     87 		goto fail;
     88 	if (gethostname(hostname, hostname_size) != 0)
     89 		strlcpy(hostname, "localhost", hostname_size);
     90 	if ((r = pam_set_item(ph, PAM_HOST, hostname)) != PAM_SUCCESS)
     91 		goto fail;
     92 	if ((r = pam_set_item(ph, PAM_USER, user)) != PAM_SUCCESS)
     93 		goto fail;
     94 	if ((r = pam_set_item(ph, PAM_CONV, pam_conv)) != PAM_SUCCESS)
     95 		goto fail;
     96 	if ((r = openpam_configure(ph, service)) != PAM_SUCCESS)
     97 		goto fail;
     98 	free(hostname);
     99 	*pamh = ph;
    100 	openpam_log(PAM_LOG_DEBUG, "pam_start(\"%s\") succeeded", service);
    101 	RETURNC(PAM_SUCCESS);
    102 fail:
    103 	free(hostname);
    104 	pam_end(ph, r);
    105 	RETURNC(r);
    106 }
    107 
    108 /*
    109  * Error codes:
    110  *
    111  *	=openpam_configure
    112  *	=pam_set_item
    113  *	!PAM_SYMBOL_ERR
    114  *	PAM_BUF_ERR
    115  */
    116 
    117 /**
    118  * The =pam_start function creates and initializes a PAM context.
    119  *
    120  * The =service argument specifies the name of the policy to apply, and is
    121  * stored in the =PAM_SERVICE item in the created context.
    122  *
    123  * The =user argument specifies the name of the target user - the user the
    124  * created context will serve to authenticate.
    125  * It is stored in the =PAM_USER item in the created context.
    126  *
    127  * The =pam_conv argument points to a =struct pam_conv describing the
    128  * conversation function to use; see =pam_conv for details.
    129  *
    130  * >pam_get_item
    131  * >pam_set_item
    132  * >pam_end
    133  */
    134