pam_exec.c revision 97182 
1/*-
2 * Copyright (c) 2001 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/lib/libpam/modules/pam_exec/pam_exec.c 97182 2002-05-23 22:03:06Z des $");
37
38#include <sys/types.h>
39#include <sys/wait.h>
40
41#include <errno.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#include <security/pam_appl.h>
47#include <security/pam_modules.h>
48#include <security/openpam.h>
49
50static int
51_pam_exec(pam_handle_t *pamh __unused, int flags __unused,
52    int argc, const char *argv[])
53{
54	int childerr, status;
55	pid_t pid;
56
57	if (argc < 1)
58		return (PAM_SERVICE_ERR);
59
60	/*
61	 * XXX For additional credit, divert child's stdin/stdout/stderr
62	 * to the conversation function.
63	 */
64	childerr = 0;
65	if ((pid = vfork()) == 0) {
66		execv(argv[0], argv);
67		childerr = errno;
68		_exit(1);
69	} else if (pid == -1) {
70		openpam_log(PAM_LOG_ERROR, "vfork(): %m");
71		return (PAM_SYSTEM_ERR);
72	}
73	if (waitpid(pid, &status, 0) == -1) {
74		openpam_log(PAM_LOG_ERROR, "waitpid(): %m");
75		return (PAM_SYSTEM_ERR);
76	}
77	if (childerr != 0) {
78		openpam_log(PAM_LOG_ERROR, "execv(): %m");
79		return (PAM_SYSTEM_ERR);
80	}
81	if (WIFSIGNALED(status)) {
82		openpam_log(PAM_LOG_ERROR, "%s caught signal %d%s",
83		    argv[0], WTERMSIG(status),
84		    WCOREDUMP(status) ? " (core dumped)" : "");
85		return (PAM_SYSTEM_ERR);
86	}
87	if (!WIFEXITED(status)) {
88		openpam_log(PAM_LOG_ERROR, "unknown status 0x%x", status);
89		return (PAM_SYSTEM_ERR);
90	}
91	if (WEXITSTATUS(status) != 0) {
92		openpam_log(PAM_LOG_ERROR, "%s returned code %d",
93		    argv[0], WEXITSTATUS(status));
94		return (PAM_SYSTEM_ERR);
95	}
96	return (PAM_SUCCESS);
97}
98
99PAM_EXTERN int
100pam_sm_authenticate(pam_handle_t *pamh, int flags,
101    int argc, const char *argv[])
102{
103
104	return (_pam_exec(pamh, flags, argc, argv));
105}
106
107PAM_EXTERN int
108pam_sm_setcred(pam_handle_t *pamh, int flags,
109    int argc, const char *argv[])
110{
111
112	return (_pam_exec(pamh, flags, argc, argv));
113}
114
115PAM_EXTERN int
116pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
117    int argc, const char *argv[])
118{
119
120	return (_pam_exec(pamh, flags, argc, argv));
121}
122
123PAM_EXTERN int
124pam_sm_open_session(pam_handle_t *pamh, int flags,
125    int argc, const char *argv[])
126{
127
128	return (_pam_exec(pamh, flags, argc, argv));
129}
130
131PAM_EXTERN int
132pam_sm_close_session(pam_handle_t *pamh, int flags,
133    int argc, const char *argv[])
134{
135
136	return (_pam_exec(pamh, flags, argc, argv));
137}
138
139PAM_EXTERN int
140pam_sm_chauthtok(pam_handle_t *pamh, int flags,
141    int argc, const char *argv[])
142{
143
144	return (_pam_exec(pamh, flags, argc, argv));
145}
146
147PAM_MODULE_ENTRY("pam_exec");
148