lock.c revision 1.22
1 /* $NetBSD: lock.c,v 1.22 2004/03/17 17:01:31 christos 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93"; 44 #endif 45 __RCSID("$NetBSD: lock.c,v 1.22 2004/03/17 17:01:31 christos Exp $"); 46 #endif /* not lint */ 47 48 /* 49 * Lock a terminal up until the given key is entered, until the root 50 * password is entered, or the given interval times out. 51 * 52 * Timeout interval is by default TIMEOUT, it can be changed with 53 * an argument of the form -time where time is in minutes 54 */ 55 56 #include <sys/param.h> 57 #include <sys/stat.h> 58 #include <sys/time.h> 59 #include <signal.h> 60 61 #include <ctype.h> 62 #include <err.h> 63 #include <pwd.h> 64 #include <errno.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <termios.h> 69 #include <time.h> 70 #include <unistd.h> 71 #ifdef SKEY 72 #include <skey.h> 73 #endif 74 75 #define TIMEOUT 15 76 77 void bye __P((int)); 78 void hi __P((int)); 79 int main __P((int, char **)); 80 void quit __P((int)); 81 #ifdef SKEY 82 int skey_auth __P((const char *)); 83 #endif 84 85 struct timeval timeout; 86 struct timeval zerotime; 87 struct termios tty, ntty; 88 int notimeout; /* no timeout at all */ 89 long nexttime; /* keep the timeout time */ 90 91 int 92 main(argc, argv) 93 int argc; 94 char **argv; 95 { 96 struct passwd *pw; 97 struct timeval timval; 98 struct itimerval ntimer, otimer; 99 struct tm *timp; 100 time_t curtime; 101 int ch, sectimeout, usemine; 102 char *ap, *mypw, *ttynam; 103 const char *tzn; 104 char hostname[MAXHOSTNAMELEN + 1], s[BUFSIZ], s1[BUFSIZ]; 105 106 if (!(pw = getpwuid(getuid()))) 107 errx(1, "unknown uid %ld.", (u_long) getuid()); 108 109 setuid(getuid()); /* discard privs */ 110 111 notimeout = 0; 112 sectimeout = TIMEOUT; 113 mypw = NULL; 114 usemine = 0; 115 116 while ((ch = getopt(argc, argv, "npt:")) != -1) 117 switch ((char)ch) { 118 case 'n': 119 notimeout = 1; 120 break; 121 case 't': 122 if ((sectimeout = atoi(optarg)) <= 0) 123 errx(1, "illegal timeout value: %s", optarg); 124 break; 125 case 'p': 126 usemine = 1; 127 mypw = strdup(pw->pw_passwd); 128 if (!mypw) 129 err(1, "strdup"); 130 break; 131 case '?': 132 default: 133 (void)fprintf(stderr, 134 "usage: lock [-p] [-t timeout]\n"); 135 exit(1); 136 } 137 timeout.tv_sec = sectimeout * 60; 138 139 if (tcgetattr(0, &tty) < 0) /* get information for header */ 140 exit(1); 141 gethostname(hostname, sizeof(hostname)); 142 hostname[sizeof(hostname) - 1] = '\0'; 143 if (!(ttynam = ttyname(0))) 144 errx(1, "not a terminal?"); 145 if (gettimeofday(&timval, (struct timezone *)NULL)) 146 err(1, "gettimeofday"); 147 curtime = timval.tv_sec; 148 nexttime = timval.tv_sec + (sectimeout * 60); 149 timp = localtime(&curtime); 150 ap = asctime(timp); 151 #ifdef __SVR4 152 tzn = tzname[0]; 153 #else 154 tzn = timp->tm_zone; 155 #endif 156 157 (void)signal(SIGINT, quit); 158 (void)signal(SIGQUIT, quit); 159 ntty = tty; ntty.c_lflag &= ~ECHO; 160 (void)tcsetattr(0, TCSADRAIN, &ntty); 161 162 if (!mypw) { 163 /* get key and check again */ 164 (void)printf("Key: "); 165 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 166 quit(0); 167 (void)printf("\nAgain: "); 168 /* 169 * Don't need EOF test here, if we get EOF, then s1 != s 170 * and the right things will happen. 171 */ 172 (void)fgets(s1, sizeof(s1), stdin); 173 (void)putchar('\n'); 174 if (strcmp(s1, s)) { 175 (void)printf("\alock: passwords didn't match.\n"); 176 (void)tcsetattr(0, TCSADRAIN, &tty); 177 exit(1); 178 } 179 s[0] = '\0'; 180 mypw = s1; 181 } 182 183 /* set signal handlers */ 184 (void)signal(SIGINT, hi); 185 (void)signal(SIGQUIT, hi); 186 (void)signal(SIGTSTP, hi); 187 188 if (notimeout) { 189 (void)signal(SIGALRM, hi); 190 (void)printf("lock: %s on %s. no timeout.\ntime now is %.20s%s%s", 191 ttynam, hostname, ap, tzn, ap + 19); 192 } 193 else { 194 (void)signal(SIGALRM, bye); 195 196 ntimer.it_interval = zerotime; 197 ntimer.it_value = timeout; 198 setitimer(ITIMER_REAL, &ntimer, &otimer); 199 200 /* header info */ 201 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 202 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 203 } 204 205 for (;;) { 206 (void)printf("Key: "); 207 if (!fgets(s, sizeof(s), stdin)) { 208 clearerr(stdin); 209 hi(0); 210 goto tryagain; 211 } 212 if (usemine) { 213 s[strlen(s) - 1] = '\0'; 214 #ifdef SKEY 215 if (strcasecmp(s, "s/key") == 0) { 216 if (skey_auth(pw->pw_name)) 217 break; 218 } 219 #endif 220 if (!strcmp(mypw, crypt(s, mypw))) 221 break; 222 } 223 else if (!strcmp(s, s1)) 224 break; 225 (void)printf("\a\n"); 226 tryagain: 227 if (tcsetattr(0, TCSADRAIN, &ntty) == -1 && errno != EINTR) 228 exit(1); 229 } 230 quit(0); 231 /* NOTREACHED */ 232 return (0); 233 } 234 235 #ifdef SKEY 236 /* 237 * We can't use libskey's skey_authenticate() since it 238 * handles signals in a way that's inappropriate 239 * for our needs. Instead we roll our own. 240 */ 241 int 242 skey_auth(user) 243 const char *user; 244 { 245 char s[128]; 246 const char *ask; 247 int ret = 0; 248 249 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 250 printf("\n[%s]\nResponse: ", ask); 251 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 252 clearerr(stdin); 253 else { 254 s[strlen(s) - 1] = '\0'; 255 if (skey_passcheck(user, s) != -1) 256 ret = 1; 257 } 258 } else 259 printf("Sorry, you have no s/key.\n"); 260 return ret; 261 } 262 #endif 263 264 void 265 hi(dummy) 266 int dummy; 267 { 268 struct timeval timval; 269 270 if (notimeout) 271 (void)printf("lock: type in the unlock key.\n"); 272 else if (!gettimeofday(&timval, (struct timezone *)NULL)) 273 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 274 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 275 } 276 277 void 278 quit(dummy) 279 int dummy; 280 { 281 (void)putchar('\n'); 282 (void)tcsetattr(0, TCSADRAIN, &tty); 283 exit(0); 284 } 285 286 void 287 bye(dummy) 288 int dummy; 289 { 290 (void)tcsetattr(0, TCSADRAIN, &tty); 291 (void)printf("lock: timeout\n"); 292 exit(1); 293 } 294
Indexes created Wed Sep 24 05:09:52 GMT 2025