lock.c revision 1.13
1 /* $NetBSD: lock.c,v 1.13 1998/07/06 06:51:23 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Bob Toxen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"); 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93"; 48 #endif 49 __RCSID("$NetBSD: lock.c,v 1.13 1998/07/06 06:51:23 mrg Exp $"); 50 #endif /* not lint */ 51 52 /* 53 * Lock a terminal up until the given key is entered, until the root 54 * password is entered, or the given interval times out. 55 * 56 * Timeout interval is by default TIMEOUT, it can be changed with 57 * an argument of the form -time where time is in minutes 58 */ 59 60 #include <sys/param.h> 61 #include <sys/stat.h> 62 #include <sys/time.h> 63 #include <signal.h> 64 65 #include <ctype.h> 66 #include <err.h> 67 #include <pwd.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <termios.h> 72 #include <time.h> 73 #include <unistd.h> 74 #ifdef SKEY 75 #include <skey.h> 76 #endif 77 78 #define TIMEOUT 15 79 80 void bye __P((int)); 81 void hi __P((int)); 82 int main __P((int, char **)); 83 void quit __P((int)); 84 #ifdef SKEY 85 int skey_auth __P((char *)); 86 #endif 87 88 struct timeval timeout; 89 struct timeval zerotime; 90 struct termios tty, ntty; 91 long nexttime; /* keep the timeout time */ 92 93 int 94 main(argc, argv) 95 int argc; 96 char **argv; 97 { 98 extern char *optarg; 99 struct passwd *pw; 100 struct timeval timval; 101 struct itimerval ntimer, otimer; 102 struct tm *timp; 103 time_t curtime; 104 int ch, sectimeout, usemine; 105 char *ap, *mypw, *ttynam, *tzn; 106 char hostname[MAXHOSTNAMELEN + 1], s[BUFSIZ], s1[BUFSIZ]; 107 108 if (!(pw = getpwuid(getuid()))) 109 errx(1, "unknown uid %d.", getuid()); 110 111 setuid(getuid()); /* discard privs */ 112 113 sectimeout = TIMEOUT; 114 mypw = NULL; 115 usemine = 0; 116 117 while ((ch = getopt(argc, argv, "pt:")) != -1) 118 switch ((char)ch) { 119 case 't': 120 if ((sectimeout = atoi(optarg)) <= 0) 121 errx(1, "illegal timeout value: %s", optarg); 122 break; 123 case 'p': 124 usemine = 1; 125 mypw = strdup(pw->pw_passwd); 126 break; 127 case '?': 128 default: 129 (void)fprintf(stderr, 130 "usage: lock [-p] [-t timeout]\n"); 131 exit(1); 132 } 133 timeout.tv_sec = sectimeout * 60; 134 135 if (tcgetattr(0, &tty) < 0) /* get information for header */ 136 exit(1); 137 gethostname(hostname, sizeof(hostname)); 138 hostname[sizeof(hostname) - 1] = '\0'; 139 if (!(ttynam = ttyname(0))) 140 errx(1, "not a terminal?"); 141 if (gettimeofday(&timval, (struct timezone *)NULL)) 142 err(1, "gettimeofday"); 143 curtime = timval.tv_sec; 144 nexttime = timval.tv_sec + (sectimeout * 60); 145 timp = localtime(&curtime); 146 ap = asctime(timp); 147 tzn = timp->tm_zone; 148 149 (void)signal(SIGINT, quit); 150 (void)signal(SIGQUIT, quit); 151 ntty = tty; ntty.c_lflag &= ~ECHO; 152 (void)tcsetattr(0, TCSADRAIN, &ntty); 153 154 if (!mypw) { 155 /* get key and check again */ 156 (void)printf("Key: "); 157 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 158 quit(0); 159 (void)printf("\nAgain: "); 160 /* 161 * Don't need EOF test here, if we get EOF, then s1 != s 162 * and the right things will happen. 163 */ 164 (void)fgets(s1, sizeof(s1), stdin); 165 (void)putchar('\n'); 166 if (strcmp(s1, s)) { 167 (void)printf("\alock: passwords didn't match.\n"); 168 (void)tcsetattr(0, TCSADRAIN, &tty); 169 exit(1); 170 } 171 s[0] = '\0'; 172 mypw = s1; 173 } 174 175 /* set signal handlers */ 176 (void)signal(SIGINT, hi); 177 (void)signal(SIGQUIT, hi); 178 (void)signal(SIGTSTP, hi); 179 (void)signal(SIGALRM, bye); 180 181 ntimer.it_interval = zerotime; 182 ntimer.it_value = timeout; 183 setitimer(ITIMER_REAL, &ntimer, &otimer); 184 185 /* header info */ 186 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 187 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 188 189 for (;;) { 190 (void)printf("Key: "); 191 if (!fgets(s, sizeof(s), stdin)) { 192 clearerr(stdin); 193 hi(0); 194 continue; 195 } 196 if (usemine) { 197 s[strlen(s) - 1] = '\0'; 198 #ifdef SKEY 199 if (strcasecmp(s, "s/key") == 0) { 200 if (skey_auth(pw->pw_name)) 201 break; 202 } 203 #endif 204 if (!strcmp(mypw, crypt(s, mypw))) 205 break; 206 } 207 else if (!strcmp(s, s1)) 208 break; 209 (void)printf("\a\n"); 210 if (tcsetattr(0, TCSADRAIN, &ntty) < 0) 211 exit(1); 212 } 213 quit(0); 214 /* NOTREACHED */ 215 return (0); 216 } 217 218 #ifdef SKEY 219 /* 220 * We can't use libskey's skey_authenticate() since it 221 * handles signals in a way that's inappropriate 222 * for our needs. Instead we roll our own. 223 */ 224 int 225 skey_auth(user) 226 char *user; 227 { 228 char s[128], *ask, *skey_keyinfo __P((char *name)); 229 int ret = 0; 230 231 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 232 printf("\n[%s]\nResponse: ", ask); 233 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 234 clearerr(stdin); 235 else { 236 s[strlen(s) - 1] = '\0'; 237 if (skey_passcheck(user, s) != -1) 238 ret = 1; 239 } 240 } else 241 printf("Sorry, you have no s/key.\n"); 242 return ret; 243 } 244 #endif 245 246 void 247 hi(dummy) 248 int dummy; 249 { 250 struct timeval timval; 251 252 if (!gettimeofday(&timval, (struct timezone *)NULL)) 253 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 254 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 255 } 256 257 void 258 quit(dummy) 259 int dummy; 260 { 261 (void)putchar('\n'); 262 (void)tcsetattr(0, TCSADRAIN, &tty); 263 exit(0); 264 } 265 266 void 267 bye(dummy) 268 int dummy; 269 { 270 (void)tcsetattr(0, TCSADRAIN, &tty); 271 (void)printf("lock: timeout\n"); 272 exit(1); 273 } 274
Indexes created Mon Sep 22 13:09:51 GMT 2025