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su.c (97241) su.c (99158)
1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
1/*-
2 * Copyright (c) 2002 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.
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the 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

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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 *
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

--- 9 unchanged lines hidden (view full) ---

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 * $P4: //depot/projects/openpam/bin/su/su.c#6 $
34 * $P4: //depot/projects/openpam/bin/su/su.c#8 $
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 <stdlib.h>
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 <stdlib.h>
44#include <string.h>
44#include <syslog.h>
45#include <unistd.h>
46
47#include <security/pam_appl.h>
45#include <syslog.h>
46#include <unistd.h>
47
48#include <security/pam_appl.h>
48#include
49#include <security/openpam.h> /* for openpam_ttyconv() */
49
50
51extern char **environ;
52
50static pam_handle_t *pamh;
51static struct pam_conv pamc;
52
53static void
54usage(void)
55{
56
57 fprintf(stderr, "Usage: su [login [args]]\n");
58 exit(1);
59}
60
53static pam_handle_t *pamh;
54static struct pam_conv pamc;
55
56static void
57usage(void)
58{
59
60 fprintf(stderr, "Usage: su [login [args]]\n");
61 exit(1);
62}
63
61static int
62check(const char *func, int pam_err)
63{
64
65 if (pam_err == PAM_SUCCESS || pam_err == PAM_NEW_AUTHTOK_REQD)
66 return pam_err;
67 openlog("su", LOG_CONS, LOG_AUTH);
68 syslog(LOG_ERR, "%s(): %s", func, pam_strerror(pamh, pam_err));
69 errx(1, "Sorry.");
70}
71
72int
73main(int argc, char *argv[])
74{
75 char hostname[MAXHOSTNAMELEN];
76 const char *user, *tty;
64int
65main(int argc, char *argv[])
66{
67 char hostname[MAXHOSTNAMELEN];
68 const char *user, *tty;
69 char **args, **pam_envlist, **pam_env;
77 struct passwd *pwd;
70 struct passwd *pwd;
78 int o, status;
71 int o, pam_err, status;
79 pid_t pid;
80
81 while ((o = getopt(argc, argv, "h")) != -1)
82 switch (o) {
83 case 'h':
84 default:
85 usage();
86 }
87
88 argc -= optind;
89 argv += optind;
90
91 /* initialize PAM */
92 pamc.conv = &openpam_ttyconv;
93 pam_start("su", argc ? *argv : "root", &pamc, &pamh);
94
95 /* set some items */
96 gethostname(hostname, sizeof(hostname));
72 pid_t pid;
73
74 while ((o = getopt(argc, argv, "h")) != -1)
75 switch (o) {
76 case 'h':
77 default:
78 usage();
79 }
80
81 argc -= optind;
82 argv += optind;
83
84 /* initialize PAM */
85 pamc.conv = &openpam_ttyconv;
86 pam_start("su", argc ? *argv : "root", &pamc, &pamh);
87
88 /* set some items */
89 gethostname(hostname, sizeof(hostname));
97 check("pam_set_item", pam_set_item(pamh, PAM_RHOST, hostname));
90 if ((pam_err = pam_set_item(pamh, PAM_RHOST, hostname)) != PAM_SUCCESS)
91 goto pamerr;
98 user = getlogin();
92 user = getlogin();
99 check("pam_set_item", pam_set_item(pamh, PAM_RUSER, user));
93 if ((pam_err = pam_set_item(pamh, PAM_RUSER, user)) != PAM_SUCCESS)
94 goto pamerr;
100 tty = ttyname(STDERR_FILENO);
95 tty = ttyname(STDERR_FILENO);
101 check("pam_set_item", pam_set_item(pamh, PAM_TTY, tty));
96 if ((pam_err = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS)
97 goto pamerr;
102
103 /* authenticate the applicant */
98
99 /* authenticate the applicant */
104 check("pam_authenticate", pam_authenticate(pamh, 0));
105 if (check("pam_acct_mgmt", pam_acct_mgmt(pamh, 0)) ==
106 PAM_NEW_AUTHTOK_REQD)
107 check("pam_chauthtok",
108 pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK));
100 if ((pam_err = pam_authenticate(pamh, 0)) != PAM_SUCCESS)
101 goto pamerr;
102 if ((pam_err = pam_acct_mgmt(pamh, 0)) == PAM_NEW_AUTHTOK_REQD)
103 pam_err = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
104 if (pam_err != PAM_SUCCESS)
105 goto pamerr;
109
110 /* establish the requested credentials */
106
107 /* establish the requested credentials */
111 check("pam_setcred", pam_setcred(pamh, PAM_ESTABLISH_CRED));
108 if ((pam_err = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS)
109 goto pamerr;
112
113 /* authentication succeeded; open a session */
110
111 /* authentication succeeded; open a session */
114 check("pam_open_session", pam_open_session(pamh, 0));
112 if ((pam_err = pam_open_session(pamh, 0)) != PAM_SUCCESS)
113 goto pamerr;
115
114
116 if (initgroups(pwd->pw_name, pwd->pw_gid) == -1)
117 err(1, "initgroups()");
118 if (setuid(pwd->pw_uid) == -1)
119 err(1, "setuid()");
115 /* get mapped user name; PAM may have changed it */
116 pam_err = pam_get_item(pamh, PAM_USER, (const void **)&user);
117 if (pam_err != PAM_SUCCESS || (pwd = getpwnam(user)) == NULL)
118 goto pamerr;
120
119
121 /* XXX export environment variables */
120 /* set uid and groups */
121 if (initgroups(pwd->pw_name, pwd->pw_gid) == -1) {
122 warn("initgroups()");
123 goto err;
124 }
125 if (setgid(pwd->pw_gid) == -1) {
126 warn("setgid()");
127 goto err;
128 }
129 if (setuid(pwd->pw_uid) == -1) {
130 warn("setuid()");
131 goto err;
132 }
122
133
134 /* export PAM environment */
135 if ((pam_envlist = pam_getenvlist(pamh)) != NULL) {
136 for (pam_env = pam_envlist; *pam_env != NULL; ++pam_env) {
137 putenv(*pam_env);
138 free(*pam_env);
139 }
140 free(pam_envlist);
141 }
142
143 /* build argument list */
144 if ((args = calloc(argc + 2, sizeof *args)) == NULL) {
145 warn("calloc()");
146 goto err;
147 }
148 *args = pwd->pw_shell;
149 memcpy(args + 1, argv, argc * sizeof *args);
150
151 /* fork and exec */
123 switch ((pid = fork())) {
124 case -1:
152 switch ((pid = fork())) {
153 case -1:
125 err(1, "fork()");
154 warn("fork()");
155 goto err;
126 case 0:
127 /* child: start a shell */
156 case 0:
157 /* child: start a shell */
128 *argv = pwd->pw_shell;
129 execvp(*argv, argv);
130 err(1, "execvp()");
158 execve(*args, args, environ);
159 warn("execve()");
160 _exit(1);
131 default:
132 /* parent: wait for child to exit */
133 waitpid(pid, &status, 0);
161 default:
162 /* parent: wait for child to exit */
163 waitpid(pid, &status, 0);
134 if (WIFEXITED(status))
135 status = WEXITSTATUS(status);
136 else
137 status = 1;
138 }
139
164
140 /* close the session and release PAM resources */
141 check("pam_close_session", pam_close_session(pamh, 0));
142 check("pam_end", pam_end(pamh, 0));
165 /* close the session and release PAM resources */
166 pam_err = pam_close_session(pamh, 0);
167 pam_end(pamh, pam_err);
143
168
144 exit(status);
169 exit(WEXITSTATUS(status));
170 }
171
172pamerr:
173 pam_end(pamh, pam_err);
174 fprintf(stderr, "Sorry\n");
175 exit(1);
176err:
177 pam_end(pamh, pam_err);
178 exit(1);
145}
179}