lock.c revision 1.10
1 /* $NetBSD: lock.c,v 1.10 1997/10/19 04:15:40 lukem 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 1.10 1997/10/19 04:15:40 lukem 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 <unistd.h> 73 #ifdef SKEY 74 #include <skey.h> 75 #endif 76 77 #define TIMEOUT 15 78 79 void bye __P((int)); 80 void hi __P((int)); 81 int main __P((int, char **)); 82 void quit __P((int)); 83 #ifdef SKEY 84 int skey_auth __P((char *)); 85 #endif 86 87 struct timeval timeout; 88 struct timeval zerotime; 89 struct termios tty, ntty; 90 long nexttime; /* keep the timeout time */ 91 92 int 93 main(argc, argv) 94 int argc; 95 char **argv; 96 { 97 extern char *optarg; 98 struct passwd *pw; 99 struct timeval timval; 100 struct itimerval ntimer, otimer; 101 struct tm *timp; 102 time_t curtime; 103 int ch, sectimeout, usemine; 104 char *ap, *mypw, *ttynam, *tzn; 105 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 106 107 sectimeout = TIMEOUT; 108 mypw = NULL; 109 usemine = 0; 110 111 if (!(pw = getpwuid(getuid()))) 112 errx(1, "unknown uid %d.", getuid()); 113 114 while ((ch = getopt(argc, argv, "pt:")) != -1) 115 switch((char)ch) { 116 case 't': 117 if ((sectimeout = atoi(optarg)) <= 0) 118 errx(1, "illegal timeout value: %s", optarg); 119 break; 120 case 'p': 121 usemine = 1; 122 mypw = strdup(pw->pw_passwd); 123 break; 124 case '?': 125 default: 126 (void)fprintf(stderr, 127 "usage: lock [-p] [-t timeout]\n"); 128 exit(1); 129 } 130 timeout.tv_sec = sectimeout * 60; 131 132 setuid(getuid()); /* discard privs */ 133 134 if (tcgetattr(0, &tty) < 0) /* get information for header */ 135 exit(1); 136 gethostname(hostname, sizeof(hostname)); 137 if (!(ttynam = ttyname(0))) 138 errx(1, "not a terminal?"); 139 if (gettimeofday(&timval, (struct timezone *)NULL)) 140 err(1, "gettimeofday"); 141 curtime = timval.tv_sec; 142 nexttime = timval.tv_sec + (sectimeout * 60); 143 timp = localtime(&curtime); 144 ap = asctime(timp); 145 tzn = timp->tm_zone; 146 147 (void)signal(SIGINT, quit); 148 (void)signal(SIGQUIT, quit); 149 ntty = tty; ntty.c_lflag &= ~ECHO; 150 (void)tcsetattr(0, TCSADRAIN, &ntty); 151 152 if (!mypw) { 153 /* get key and check again */ 154 (void)printf("Key: "); 155 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 156 quit(0); 157 (void)printf("\nAgain: "); 158 /* 159 * Don't need EOF test here, if we get EOF, then s1 != s 160 * and the right things will happen. 161 */ 162 (void)fgets(s1, sizeof(s1), stdin); 163 (void)putchar('\n'); 164 if (strcmp(s1, s)) { 165 (void)printf("\alock: passwords didn't match.\n"); 166 (void)tcsetattr(0, TCSADRAIN, &tty); 167 exit(1); 168 } 169 s[0] = '\0'; 170 mypw = s1; 171 } 172 173 /* set signal handlers */ 174 (void)signal(SIGINT, hi); 175 (void)signal(SIGQUIT, hi); 176 (void)signal(SIGTSTP, hi); 177 (void)signal(SIGALRM, bye); 178 179 ntimer.it_interval = zerotime; 180 ntimer.it_value = timeout; 181 setitimer(ITIMER_REAL, &ntimer, &otimer); 182 183 /* header info */ 184 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 185 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 186 187 for (;;) { 188 (void)printf("Key: "); 189 if (!fgets(s, sizeof(s), stdin)) { 190 clearerr(stdin); 191 hi(0); 192 continue; 193 } 194 if (usemine) { 195 s[strlen(s) - 1] = '\0'; 196 #ifdef SKEY 197 if (strcasecmp(s, "s/key") == 0) { 198 if (skey_auth(pw->pw_name)) 199 break; 200 } 201 #endif 202 if (!strcmp(mypw, crypt(s, mypw))) 203 break; 204 } 205 else if (!strcmp(s, s1)) 206 break; 207 (void)printf("\a\n"); 208 if (tcsetattr(0, TCSADRAIN, &ntty) < 0) 209 exit(1); 210 } 211 quit(0); 212 /* NOTREACHED */ 213 return (0); 214 } 215 216 #ifdef SKEY 217 /* 218 * We can't use libskey's skey_authenticate() since it 219 * handles signals in a way that's inappropriate 220 * for our needs. Instead we roll our own. 221 */ 222 int 223 skey_auth(char *user) 224 { 225 char s[128], *ask, *skey_keyinfo __P((char *name)); 226 int ret = 0; 227 228 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 229 printf("\n[%s]\nResponse: ", ask); 230 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 231 clearerr(stdin); 232 else { 233 s[strlen(s) - 1] = '\0'; 234 if (skey_passcheck(user, s) != -1) 235 ret = 1; 236 } 237 } else 238 printf("Sorry, you have no s/key.\n"); 239 return ret; 240 } 241 #endif 242 243 void 244 hi(dummy) 245 int dummy; 246 { 247 struct timeval timval; 248 249 if (!gettimeofday(&timval, (struct timezone *)NULL)) 250 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 251 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 252 } 253 254 void 255 quit(dummy) 256 int dummy; 257 { 258 (void)putchar('\n'); 259 (void)tcsetattr(0, TCSADRAIN, &tty); 260 exit(0); 261 } 262 263 void 264 bye(dummy) 265 int dummy; 266 { 267 (void)tcsetattr(0, TCSADRAIN, &tty); 268 (void)printf("lock: timeout\n"); 269 exit(1); 270 } 271
Indexes created Wed Sep 24 15:09:51 GMT 2025