login_token.c revision 1.9
1/* $OpenBSD: login_token.c,v 1.9 2012/12/04 02:24:47 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/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 *class = 0; 59 char *username = 0; 60 char *instance; 61 char challenge[1024]; 62 char response[1024]; 63 char *pp = 0; 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) < 0) 82 syslog(LOG_ERR, "couldn't set core dump size to 0: %m"); 83 84 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 85 if (token_init(argv[0]) < 0) { 86 syslog(LOG_ERR, "unknown token type"); 87 errx(1, "unknown token type"); 88 } 89 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL); 90 91 while ((c = getopt(argc, argv, "ds:v:")) != -1) 92 switch (c) { 93 case 'd': /* to remain undocumented */ 94 back = stdout; 95 break; 96 case 'v': 97 break; 98 case 's': /* service */ 99 if (strcmp(optarg, "login") == 0) 100 mode = 0; 101 else if (strcmp(optarg, "challenge") == 0) 102 mode = 1; 103 else if (strcmp(optarg, "response") == 0) 104 mode = 2; 105 else { 106 syslog(LOG_ERR, "%s: invalid service", optarg); 107 exit(1); 108 } 109 break; 110 default: 111 syslog(LOG_ERR, "usage error"); 112 exit(1); 113 } 114 115 switch (argc - optind) { 116 case 2: 117 class = argv[optind + 1]; 118 case 1: 119 username = argv[optind]; 120 break; 121 default: 122 syslog(LOG_ERR, "usage error"); 123 exit(1); 124 } 125 126 127 if (back == NULL && (back = fdopen(3, "r+")) == NULL) { 128 syslog(LOG_ERR, "reopening back channel"); 129 exit(1); 130 } 131 if (mode == 2) { 132 mode = 0; 133 c = -1; 134 while (++c < sizeof(challenge) && 135 read(3, &challenge[c], 1) == 1) { 136 if (challenge[c] == '\0' && ++mode == 2) 137 break; 138 if (challenge[c] == '\0' && mode == 1) 139 pp = challenge + c + 1; 140 } 141 if (mode < 2) { 142 syslog(LOG_ERR, "protocol error on back channel"); 143 exit(1); 144 } 145 } else { 146 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 147 tokenchallenge(username, challenge, sizeof(challenge), 148 tt->proper); 149 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL); 150 if (mode == 1) { 151 fprintf(back, BI_VALUE " challenge %s\n", 152 auth_mkvalue(challenge)); 153 fprintf(back, BI_CHALLENGE "\n"); 154 exit(0); 155 } 156 157 pp = readpassphrase(challenge, response, sizeof(response), 0); 158 if (pp == NULL) 159 exit(1); 160 if (*pp == '\0') { 161 char buf[64]; 162 snprintf(buf, sizeof(buf), "%s Response [echo on]: ", 163 tt->proper); 164 pp = readpassphrase(buf, response, sizeof(response), 165 RPP_ECHO_ON); 166 if (pp == NULL) 167 exit(1); 168 } 169 } 170 171 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 172 if (tokenverify(username, challenge, pp) == 0) { 173 fprintf(back, BI_AUTH "\n"); 174 175 if ((instance = strchr(username, '.'))) { 176 *instance++ = 0; 177 if (strcmp(instance, "root") == 0) 178 fprintf(back, BI_ROOTOKAY "\n"); 179 } 180 fprintf(back, BI_SECURE "\n"); 181 exit(0); 182 } 183 184 fprintf(back, BI_REJECT "\n"); 185 exit(1); 186} 187