1 /* $OpenBSD: login_token.c,v 1.17 2021/01/02 20:32:20 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/time.h>
39 #include <sys/resource.h>
40
41 #include <err.h>
42 #include <readpassphrase.h>
43 #include <signal.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <syslog.h>
47 #include <limits.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 *username = NULL;
60 char *instance;
61 char challenge[1024];
62 char response[1024];
63 char *pp = NULL;
64 int c;
65 int mode = 0;
66 struct rlimit cds;
67 sigset_t blockset;
68
69 (void)setpriority(PRIO_PROCESS, 0, 0);
70
71 /* We block keyboard-generated signals during database accesses. */
72 sigemptyset(&blockset);
73 sigaddset(&blockset, SIGINT);
74 sigaddset(&blockset, SIGQUIT);
75 sigaddset(&blockset, SIGTSTP);
76
77 openlog(NULL, LOG_ODELAY, LOG_AUTH);
78
79 cds.rlim_cur = 0;
80 cds.rlim_max = 0;
81 if (setrlimit(RLIMIT_CORE, &cds) == -1)
82 syslog(LOG_ERR, "couldn't set core dump size to 0: %m");
83
84 if (pledge("stdio rpath wpath cpath fattr flock getpw tty", NULL) == -1) {
85 syslog(LOG_ERR, "pledge: %m");
86 exit(1);
87 }
88
89 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
90 if (token_init(argv[0]) < 0) {
91 syslog(LOG_ERR, "unknown token type");
92 errx(1, "unknown token type");
93 }
94 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
95
96 while ((c = getopt(argc, argv, "ds:v:")) != -1)
97 switch (c) {
98 case 'd': /* to remain undocumented */
99 back = stdout;
100 break;
101 case 'v':
102 break;
103 case 's': /* service */
104 if (strcmp(optarg, "login") == 0)
105 mode = 0;
106 else if (strcmp(optarg, "challenge") == 0)
107 mode = 1;
108 else if (strcmp(optarg, "response") == 0)
109 mode = 2;
110 else {
111 syslog(LOG_ERR, "%s: invalid service", optarg);
112 exit(1);
113 }
114 break;
115 default:
116 syslog(LOG_ERR, "usage error");
117 exit(1);
118 }
119
120 switch (argc - optind) {
121 case 2:
122 case 1:
123 username = argv[optind];
124 break;
125 default:
126 syslog(LOG_ERR, "usage error");
127 exit(1);
128 }
129
130
131 if (back == NULL && (back = fdopen(3, "r+")) == NULL) {
132 syslog(LOG_ERR, "reopening back channel");
133 exit(1);
134 }
135 if (mode == 2) {
136 mode = 0;
137 c = -1;
138 while (++c < sizeof(challenge) &&
139 read(3, &challenge[c], 1) == 1) {
140 if (challenge[c] == '\0' && ++mode == 2)
141 break;
142 if (challenge[c] == '\0' && mode == 1)
143 pp = challenge + c + 1;
144 }
145 if (mode < 2) {
146 syslog(LOG_ERR, "protocol error on back channel");
147 exit(1);
148 }
149 } else {
150 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
151 tokenchallenge(username, challenge, sizeof(challenge),
152 tt->proper);
153 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
154 if (mode == 1) {
155 char *val = auth_mkvalue(challenge);
156 if (val == NULL) {
157 (void)fprintf(back, BI_VALUE " errormsg %s\n",
158 "unable to allocate memory");
159 (void)fprintf(back, BI_REJECT "\n");
160 exit(1);
161 }
162 fprintf(back, BI_VALUE " challenge %s\n", val);
163 fprintf(back, BI_CHALLENGE "\n");
164 exit(0);
165 }
166
167 pp = readpassphrase(challenge, response, sizeof(response), 0);
168 if (pp == NULL)
169 exit(1);
170 if (*pp == '\0') {
171 char buf[64];
172 snprintf(buf, sizeof(buf), "%s Response [echo on]: ",
173 tt->proper);
174 pp = readpassphrase(buf, response, sizeof(response),
175 RPP_ECHO_ON);
176 if (pp == NULL)
177 exit(1);
178 }
179 }
180
181 (void)sigprocmask(SIG_BLOCK, &blockset, NULL);
182 if (tokenverify(username, challenge, pp) == 0) {
183 fprintf(back, BI_AUTH "\n");
184
185 if ((instance = strchr(username, '.'))) {
186 *instance++ = 0;
187 if (strcmp(instance, "root") == 0)
188 fprintf(back, BI_ROOTOKAY "\n");
189 }
190 fprintf(back, BI_SECURE "\n");
191 exit(0);
192 }
193
194 fprintf(back, BI_REJECT "\n");
195 exit(1);
196 }
197