login_token.c revision 1.7
1/* $OpenBSD: login_token.c,v 1.7 2002/09/06 18:19:14 deraadt 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 || *pp == '\0') { 160 char buf[64]; 161 snprintf(buf, sizeof(buf), "%s Response [echo on]: ", 162 tt->proper); 163 pp = readpassphrase(buf, response, sizeof(response), 164 RPP_ECHO_ON); 165 } 166 } 167 168 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 169 if (tokenverify(username, challenge, pp) == 0) { 170 fprintf(back, BI_AUTH "\n"); 171 172 if ((instance = strchr(username, '.'))) { 173 *instance++ = 0; 174 if (strcmp(instance, "root") == 0) 175 fprintf(back, BI_ROOTOKAY "\n"); 176 } 177 fprintf(back, BI_SECURE "\n"); 178 exit(0); 179 } 180 181 fprintf(back, BI_REJECT "\n"); 182 exit(1); 183} 184