1 /* $OpenBSD: login_token.c,v 1.8 2004/03/10 21:30:27 millert Exp $ */
2
3 /*-
4 * Copyright (c) 1995, 1996 Berkeley Software Design, Inc. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Berkeley Software Design,
17 * Inc.
18 * 4. The name of Berkeley Software Design, Inc. may not be used to endorse
19 * or promote products derived from this software without specific prior
20 * written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``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 BERKELEY SOFTWARE DESIGN, INC. 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 * BSDI $From: login_token.c,v 1.2 1996/09/04 05:33:05 prb Exp $
35 */
36
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/time.h>
40 #include <sys/resource.h>
41
42 #include <err.h>
43 #include <readpassphrase.h>
44 #include <signal.h>
45 #include <stdio.h>
46 #include <syslog.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <login_cap.h>
51 #include <bsd_auth.h>
52
53 #include "token.h"
54
55 int
main(int argc,char * argv[])56 main(int argc, char *argv[])
57 {
58 FILE *back = NULL;
59 char *class = 0;
60 char *username = 0;
61 char *instance;
62 char challenge[1024];
63 char response[1024];
64 char *pp = 0;
65 int c;
66 int mode = 0;
67 struct rlimit cds;
68 sigset_t blockset;
69
70 (void)setpriority(PRIO_PROCESS, 0, 0);
71
72 /* We block keyboard-generated signals during database accesses. */
73 sigemptyset(&blockset);
74 sigaddset(&blockset, SIGINT);
75 sigaddset(&blockset, SIGQUIT);
76 sigaddset(&blockset, SIGTSTP);
77
78 openlog(NULL, LOG_ODELAY, LOG_AUTH);
79
80 cds.rlim_cur = 0;
81 cds.rlim_max = 0;
82 if (setrlimit(RLIMIT_CORE, &cds) < 0)
83 syslog(LOG_ERR, "couldn't set core dump size to 0: %m");
84
85 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
86 if (token_init(argv[0]) < 0) {
87 syslog(LOG_ERR, "unknown token type");
88 errx(1, "unknown token type");
89 }
90 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
91
92 while ((c = getopt(argc, argv, "ds:v:")) != -1)
93 switch (c) {
94 case 'd': /* to remain undocumented */
95 back = stdout;
96 break;
97 case 'v':
98 break;
99 case 's': /* service */
100 if (strcmp(optarg, "login") == 0)
101 mode = 0;
102 else if (strcmp(optarg, "challenge") == 0)
103 mode = 1;
104 else if (strcmp(optarg, "response") == 0)
105 mode = 2;
106 else {
107 syslog(LOG_ERR, "%s: invalid service", optarg);
108 exit(1);
109 }
110 break;
111 default:
112 syslog(LOG_ERR, "usage error");
113 exit(1);
114 }
115
116 switch (argc - optind) {
117 case 2:
118 class = argv[optind + 1];
119 case 1:
120 username = argv[optind];
121 break;
122 default:
123 syslog(LOG_ERR, "usage error");
124 exit(1);
125 }
126
127
128 if (back == NULL && (back = fdopen(3, "r+")) == NULL) {
129 syslog(LOG_ERR, "reopening back channel");
130 exit(1);
131 }
132 if (mode == 2) {
133 mode = 0;
134 c = -1;
135 while (++c < sizeof(challenge) &&
136 read(3, &challenge[c], 1) == 1) {
137 if (challenge[c] == '\0' && ++mode == 2)
138 break;
139 if (challenge[c] == '\0' && mode == 1)
140 pp = challenge + c + 1;
141 }
142 if (mode < 2) {
143 syslog(LOG_ERR, "protocol error on back channel");
144 exit(1);
145 }
146 } else {
147 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
148 tokenchallenge(username, challenge, sizeof(challenge),
149 tt->proper);
150 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
151 if (mode == 1) {
152 fprintf(back, BI_VALUE " challenge %s\n",
153 auth_mkvalue(challenge));
154 fprintf(back, BI_CHALLENGE "\n");
155 exit(0);
156 }
157
158 pp = readpassphrase(challenge, response, sizeof(response), 0);
159 if (pp == NULL)
160 exit(1);
161 if (*pp == '\0') {
162 char buf[64];
163 snprintf(buf, sizeof(buf), "%s Response [echo on]: ",
164 tt->proper);
165 pp = readpassphrase(buf, response, sizeof(response),
166 RPP_ECHO_ON);
167 if (pp == NULL)
168 exit(1);
169 }
170 }
171
172 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
173 if (tokenverify(username, challenge, pp) == 0) {
174 fprintf(back, BI_AUTH "\n");
175
176 if ((instance = strchr(username, '.'))) {
177 *instance++ = 0;
178 if (strcmp(instance, "root") == 0)
179 fprintf(back, BI_ROOTOKAY "\n");
180 }
181 fprintf(back, BI_SECURE "\n");
182 exit(0);
183 }
184
185 fprintf(back, BI_REJECT "\n");
186 exit(1);
187 }
188