1 /* $NetBSD: pam_start.c,v 1.4 2023/06/30 21:46:21 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav
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 1.4 2023/06/30 21:46:21 christos 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
pam_start(const char * service,const char * user,const struct pam_conv * pam_conv,pam_handle_t ** pamh)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((size_t)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