login_token.c revision 1.12
1/* $OpenBSD: login_token.c,v 1.12 2015/10/15 20:14:23 bluhm 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 55int 56main(int argc, char *argv[]) 57{ 58 FILE *back = NULL; 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 if (pledge("stdio rpath wpath cpath fattr getpw tty", NULL) == -1) 85 err(1, "pledge"); 86 87 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 88 if (token_init(argv[0]) < 0) { 89 syslog(LOG_ERR, "unknown token type"); 90 errx(1, "unknown token type"); 91 } 92 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL); 93 94 while ((c = getopt(argc, argv, "ds:v:")) != -1) 95 switch (c) { 96 case 'd': /* to remain undocumented */ 97 back = stdout; 98 break; 99 case 'v': 100 break; 101 case 's': /* service */ 102 if (strcmp(optarg, "login") == 0) 103 mode = 0; 104 else if (strcmp(optarg, "challenge") == 0) 105 mode = 1; 106 else if (strcmp(optarg, "response") == 0) 107 mode = 2; 108 else { 109 syslog(LOG_ERR, "%s: invalid service", optarg); 110 exit(1); 111 } 112 break; 113 default: 114 syslog(LOG_ERR, "usage error"); 115 exit(1); 116 } 117 118 switch (argc - optind) { 119 case 2: 120 case 1: 121 username = argv[optind]; 122 break; 123 default: 124 syslog(LOG_ERR, "usage error"); 125 exit(1); 126 } 127 128 129 if (back == NULL && (back = fdopen(3, "r+")) == NULL) { 130 syslog(LOG_ERR, "reopening back channel"); 131 exit(1); 132 } 133 if (mode == 2) { 134 mode = 0; 135 c = -1; 136 while (++c < sizeof(challenge) && 137 read(3, &challenge[c], 1) == 1) { 138 if (challenge[c] == '\0' && ++mode == 2) 139 break; 140 if (challenge[c] == '\0' && mode == 1) 141 pp = challenge + c + 1; 142 } 143 if (mode < 2) { 144 syslog(LOG_ERR, "protocol error on back channel"); 145 exit(1); 146 } 147 } else { 148 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 149 tokenchallenge(username, challenge, sizeof(challenge), 150 tt->proper); 151 (void)sigprocmask(SIG_UNBLOCK, &blockset, NULL); 152 if (mode == 1) { 153 fprintf(back, BI_VALUE " challenge %s\n", 154 auth_mkvalue(challenge)); 155 fprintf(back, BI_CHALLENGE "\n"); 156 exit(0); 157 } 158 159 pp = readpassphrase(challenge, response, sizeof(response), 0); 160 if (pp == NULL) 161 exit(1); 162 if (*pp == '\0') { 163 char buf[64]; 164 snprintf(buf, sizeof(buf), "%s Response [echo on]: ", 165 tt->proper); 166 pp = readpassphrase(buf, response, sizeof(response), 167 RPP_ECHO_ON); 168 if (pp == NULL) 169 exit(1); 170 } 171 } 172 173 (void)sigprocmask(SIG_BLOCK, &blockset, NULL); 174 if (tokenverify(username, challenge, pp) == 0) { 175 fprintf(back, BI_AUTH "\n"); 176 177 if ((instance = strchr(username, '.'))) { 178 *instance++ = 0; 179 if (strcmp(instance, "root") == 0) 180 fprintf(back, BI_ROOTOKAY "\n"); 181 } 182 fprintf(back, BI_SECURE "\n"); 183 exit(0); 184 } 185 186 fprintf(back, BI_REJECT "\n"); 187 exit(1); 188} 189