source: openpam/trunk/bin/su/su.c @ 16

Last change on this file since 16 was 16, checked in by Dag-Erling Smørgrav, 17 years ago

Whitespace cleanup + keyword expansion sweep.

Sponsored by: DARPA, NAI Labs

  • Property svn:keywords set to Id LastChangedRevision HeadURL LastChangedDate LastChangedBy
File size: 4.1 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technologies, 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 * $Id: su.c 16 2002-02-01 22:20:07Z des $
35 */
36
37#include <sys/param.h>
38#include <sys/wait.h>
39
40#include <err.h>
41#include <pwd.h>
42#include <stdio.h>
43#include <syslog.h>
44#include <unistd.h>
45
46#include <security/pam_appl.h>
47#include <security/openpam.h>
48
49static pam_handle_t *pamh;
50static struct pam_conv pamc;
51
52static void
53usage(void)
54{
55
56        fprintf(stderr, "Usage: su [login [args]]\n");
57        exit(1);
58}
59
60static int
61check(const char *func, int pam_err)
62{
63
64        if (pam_err == PAM_SUCCESS || pam_err == PAM_NEW_AUTHTOK_REQD)
65                return pam_err;
66        openlog("su", LOG_CONS, LOG_AUTH);
67        syslog(LOG_ERR, "%s(): %s", func, pam_strerror(pamh, pam_err));
68        errx(1, "Sorry.");
69}
70
71int
72main(int argc, char *argv[])
73{
74        char hostname[MAXHOSTNAMELEN];
75        const char *user, *tty;
76        struct passwd *pwd;
77        int o, status;
78        pid_t pid;
79
80        while ((o = getopt(argc, argv, "h")) != -1)
81                switch (o) {
82                case 'h':
83                default:
84                        usage();
85                }
86
87        argc -= optind;
88        argv += optind;
89
90        /* initialize PAM */
91        pamc.conv = &openpam_ttyconv;
92        pam_start("su", argc ? *argv : "root", &pamc, &pamh);
93
94        /* set some items */
95        gethostname(hostname, sizeof hostname);
96        check("pam_set_item", pam_set_item(pamh, PAM_RHOST, hostname));
97        user = getlogin();
98        check("pam_set_item", pam_set_item(pamh, PAM_RUSER, user));
99        tty = ttyname(STDERR_FILENO);
100        check("pam_set_item", pam_set_item(pamh, PAM_TTY, tty));
101
102        /* authenticate the applicant */
103        check("pam_authenticate", pam_authenticate(pamh, 0));
104        if (check("pam_acct_mgmt", pam_acct_mgmt(pamh, 0)) ==
105            PAM_NEW_AUTHTOK_REQD)
106                check("pam_chauthtok",
107                    pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK));
108
109        /* establish the requested credentials */
110        check("pam_setcred", pam_setcred(pamh, PAM_ESTABLISH_CRED));
111
112        /* authentication succeeded; open a session */
113        check("pam_open_session", pam_open_session(pamh, 0));
114
115        if (initgroups(pwd->pw_name, pwd->pw_gid) == -1)
116                err(1, "initgroups()");
117        if (setuid(pwd->pw_uid) == -1)
118                err(1, "setuid()");
119
120        /* XXX export environment variables */
121
122        switch ((pid = fork())) {
123        case -1:
124                err(1, "fork()");
125        case 0:
126                /* child: start a shell */
127                *argv = pwd->pw_shell;
128                execvp(*argv, argv);
129                err(1, "execvp()");
130        default:
131                /* parent: wait for child to exit */
132                waitpid(pid, &status, 0);
133                if (WIFEXITED(status))
134                        status = WEXITSTATUS(status);
135                else
136                        status = 1;
137        }
138
139        /* close the session and release PAM resources */
140        check("pam_close_session", pam_close_session(pamh, 0));
141        check("pam_end", pam_end(pamh, 0));
142
143        exit(status);
144}
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