lock.c revision 1.5
1 /* $NetBSD: lock.c,v 1.5 1995/05/02 01:22:58 mycroft 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 #ifndef lint 40 static char copyright[] = 41 "@(#) 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 static char rcsid[] = "$NetBSD: lock.c,v 1.5 1995/05/02 01:22:58 mycroft 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 <sys/signal.h> 64 65 #include <ctype.h> 66 #include <err.h> 67 #include <pwd.h> 68 #include <stdio.h> 69 #include <string.h> 70 #include <termios.h> 71 72 #define TIMEOUT 15 73 74 void quit(), bye(), hi(); 75 76 struct timeval timeout; 77 struct timeval zerotime; 78 struct termios tty, ntty; 79 long nexttime; /* keep the timeout time */ 80 81 /*ARGSUSED*/ 82 main(argc, argv) 83 int argc; 84 char **argv; 85 { 86 extern char *optarg; 87 extern int errno, optind; 88 struct passwd *pw; 89 struct timeval timval; 90 struct itimerval ntimer, otimer; 91 struct tm *timp; 92 int ch, sectimeout, usemine; 93 char *ap, *mypw, *ttynam, *tzn; 94 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 95 char *crypt(), *ttyname(); 96 97 sectimeout = TIMEOUT; 98 mypw = NULL; 99 usemine = 0; 100 101 if (!(pw = getpwuid(getuid()))) 102 errx(1, "unknown uid %d.", getuid()); 103 104 while ((ch = getopt(argc, argv, "pt:")) != EOF) 105 switch((char)ch) { 106 case 't': 107 if ((sectimeout = atoi(optarg)) <= 0) 108 errx(1, "illegal timeout value: %s", optarg); 109 break; 110 case 'p': 111 usemine = 1; 112 mypw = strdup(pw->pw_passwd); 113 break; 114 case '?': 115 default: 116 (void)fprintf(stderr, 117 "usage: lock [-p] [-t timeout]\n"); 118 exit(1); 119 } 120 timeout.tv_sec = sectimeout * 60; 121 122 setuid(getuid()); /* discard privs */ 123 124 if (tcgetattr(0, &tty) < 0) /* get information for header */ 125 exit(1); 126 gethostname(hostname, sizeof(hostname)); 127 if (!(ttynam = ttyname(0))) 128 errx(1, "not a terminal?"); 129 if (gettimeofday(&timval, (struct timezone *)NULL)) 130 err(1, "gettimeofday"); 131 nexttime = timval.tv_sec + (sectimeout * 60); 132 timp = localtime(&timval.tv_sec); 133 ap = asctime(timp); 134 tzn = timp->tm_zone; 135 136 (void)signal(SIGINT, quit); 137 (void)signal(SIGQUIT, quit); 138 ntty = tty; ntty.c_lflag &= ~ECHO; 139 (void)tcsetattr(0, TCSADRAIN, &ntty); 140 141 if (!mypw) { 142 /* get key and check again */ 143 (void)printf("Key: "); 144 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 145 quit(); 146 (void)printf("\nAgain: "); 147 /* 148 * Don't need EOF test here, if we get EOF, then s1 != s 149 * and the right things will happen. 150 */ 151 (void)fgets(s1, sizeof(s1), stdin); 152 (void)putchar('\n'); 153 if (strcmp(s1, s)) { 154 (void)printf("\alock: passwords didn't match.\n"); 155 (void)tcsetattr(0, TCSADRAIN, &tty); 156 exit(1); 157 } 158 s[0] = NULL; 159 mypw = s1; 160 } 161 162 /* set signal handlers */ 163 (void)signal(SIGINT, hi); 164 (void)signal(SIGQUIT, hi); 165 (void)signal(SIGTSTP, hi); 166 (void)signal(SIGALRM, bye); 167 168 ntimer.it_interval = zerotime; 169 ntimer.it_value = timeout; 170 setitimer(ITIMER_REAL, &ntimer, &otimer); 171 172 /* header info */ 173 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 174 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 175 176 for (;;) { 177 (void)printf("Key: "); 178 if (!fgets(s, sizeof(s), stdin)) { 179 clearerr(stdin); 180 hi(); 181 continue; 182 } 183 if (usemine) { 184 s[strlen(s) - 1] = '\0'; 185 #ifdef SKEY 186 if (strcasecmp(s, "s/key") == 0) { 187 if (skey_auth(pw->pw_name)) 188 break; 189 } 190 #endif 191 if (!strcmp(mypw, crypt(s, mypw))) 192 break; 193 } 194 else if (!strcmp(s, s1)) 195 break; 196 (void)printf("\a\n"); 197 if (tcsetattr(0, TCSADRAIN, &ntty) < 0) 198 exit(1); 199 } 200 quit(); 201 } 202 203 #ifdef SKEY 204 /* 205 * We can't use libskey's skey_authenticate() since it 206 * handles signals in a way that's inappropriate 207 * for our needs. Instead we roll our own. 208 */ 209 int 210 skey_auth(char *user) 211 { 212 char s[128], *ask, *skey_keyinfo __P((char *name)); 213 int ret = 0; 214 215 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 216 printf("\n[%s]\nResponse: ", ask); 217 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 218 clearerr(stdin); 219 else { 220 s[strlen(s) - 1] = '\0'; 221 if (skey_passcheck(user, s) != -1) 222 ret = 1; 223 } 224 } else 225 printf("Sorry, you have no s/key.\n"); 226 return ret; 227 } 228 #endif 229 230 void 231 hi() 232 { 233 struct timeval timval; 234 235 if (!gettimeofday(&timval, (struct timezone *)NULL)) 236 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 237 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 238 } 239 240 void 241 quit() 242 { 243 (void)putchar('\n'); 244 (void)tcsetattr(0, TCSADRAIN, &tty); 245 exit(0); 246 } 247 248 void 249 bye() 250 { 251 (void)tcsetattr(0, TCSADRAIN, &tty); 252 (void)printf("lock: timeout\n"); 253 exit(1); 254 } 255
Indexes created Mon Sep 22 21:09:42 GMT 2025