login_token.c revision 1.10 
1/*	$OpenBSD: login_token.c,v 1.10 2013/01/13 21:21:17 fgsch 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 <stdio.h>
45#include <syslog.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49#include <login_cap.h>
50#include <bsd_auth.h>
51
52#include "token.h"
53
54int
55main(int argc, char *argv[])
56{
57	FILE *back = NULL;
58	char *username = 0;
59	char *instance;
60	char challenge[1024];
61	char response[1024];
62	char *pp = 0;
63	int c;
64	int mode = 0;
65	struct rlimit cds;
66	sigset_t blockset;
67
68	(void)setpriority(PRIO_PROCESS, 0, 0);
69
70	/* We block keyboard-generated signals during database accesses. */
71	sigemptyset(&blockset);
72	sigaddset(&blockset, SIGINT);
73	sigaddset(&blockset, SIGQUIT);
74	sigaddset(&blockset, SIGTSTP);
75
76	openlog(NULL, LOG_ODELAY, LOG_AUTH);
77
78	cds.rlim_cur = 0;
79	cds.rlim_max = 0;
80	if (setrlimit(RLIMIT_CORE, &cds) < 0)
81		syslog(LOG_ERR, "couldn't set core dump size to 0: %m");
82
83	(void)sigprocmask(SIG_BLOCK, &blockset, NULL);
84	if (token_init(argv[0]) < 0) {
85		syslog(LOG_ERR, "unknown token type");
86		errx(1, "unknown token type");
87	}
88	(void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
89
90	while ((c = getopt(argc, argv, "ds:v:")) != -1)
91		switch (c) {
92		case 'd':		/* to remain undocumented */
93			back = stdout;
94			break;
95		case 'v':
96			break;
97		case 's':	/* service */
98			if (strcmp(optarg, "login") == 0)
99				mode = 0;
100			else if (strcmp(optarg, "challenge") == 0)
101				mode = 1;
102			else if (strcmp(optarg, "response") == 0)
103				mode = 2;
104			else {
105				syslog(LOG_ERR, "%s: invalid service", optarg);
106				exit(1);
107			}
108			break;
109		default:
110			syslog(LOG_ERR, "usage error");
111			exit(1);
112		}
113
114	switch (argc - optind) {
115	case 2:
116	case 1:
117		username = argv[optind];
118		break;
119	default:
120		syslog(LOG_ERR, "usage error");
121		exit(1);
122	}
123
124
125	if (back == NULL && (back = fdopen(3, "r+")) == NULL)  {
126		syslog(LOG_ERR, "reopening back channel");
127		exit(1);
128	}
129	if (mode == 2) {
130		mode = 0;
131		c = -1;
132		while (++c < sizeof(challenge) &&
133		    read(3, &challenge[c], 1) == 1) {
134			if (challenge[c] == '\0' && ++mode == 2)
135				break;
136			if (challenge[c] == '\0' && mode == 1)
137				pp = challenge + c + 1;
138		}
139		if (mode < 2) {
140			syslog(LOG_ERR, "protocol error on back channel");
141			exit(1);
142		}
143	} else {
144		(void)sigprocmask(SIG_BLOCK, &blockset, NULL);
145		tokenchallenge(username, challenge, sizeof(challenge),
146		    tt->proper);
147		(void)sigprocmask(SIG_UNBLOCK, &blockset, NULL);
148		if (mode == 1) {
149			fprintf(back, BI_VALUE " challenge %s\n",
150			    auth_mkvalue(challenge));
151			fprintf(back, BI_CHALLENGE "\n");
152			exit(0);
153		}
154
155		pp = readpassphrase(challenge, response, sizeof(response), 0);
156		if (pp == NULL)
157			exit(1);
158		if (*pp == '\0') {
159			char buf[64];
160			snprintf(buf, sizeof(buf), "%s Response [echo on]: ",
161			    tt->proper);
162			pp = readpassphrase(buf, response, sizeof(response),
163			    RPP_ECHO_ON);
164			if (pp == NULL)
165				exit(1);
166		}
167	}
168
169	(void)sigprocmask(SIG_BLOCK, &blockset, NULL);
170	if (tokenverify(username, challenge, pp) == 0) {
171		fprintf(back, BI_AUTH "\n");
172
173		if ((instance = strchr(username, '.'))) {
174			*instance++ = 0;
175			if (strcmp(instance, "root") == 0)
176				fprintf(back, BI_ROOTOKAY "\n");
177		}
178		fprintf(back, BI_SECURE "\n");
179		exit(0);
180	}
181
182	fprintf(back, BI_REJECT "\n");
183	exit(1);
184}
185