login_token.c revision 1.8 
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
55int
56main(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