lock.c revision 1.16
1 /* $NetBSD: lock.c,v 1.16 1998/12/19 19:30:57 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. 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 1.16 1998/12/19 19:30:57 christos 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((const 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; 106 const char *tzn; 107 char hostname[MAXHOSTNAMELEN + 1], s[BUFSIZ], s1[BUFSIZ]; 108 109 if (!(pw = getpwuid(getuid()))) 110 errx(1, "unknown uid %ld.", (u_long) getuid()); 111 112 setuid(getuid()); /* discard privs */ 113 114 sectimeout = TIMEOUT; 115 mypw = NULL; 116 usemine = 0; 117 118 while ((ch = getopt(argc, argv, "pt:")) != -1) 119 switch ((char)ch) { 120 case 't': 121 if ((sectimeout = atoi(optarg)) <= 0) 122 errx(1, "illegal timeout value: %s", optarg); 123 break; 124 case 'p': 125 usemine = 1; 126 mypw = strdup(pw->pw_passwd); 127 break; 128 case '?': 129 default: 130 (void)fprintf(stderr, 131 "usage: lock [-p] [-t timeout]\n"); 132 exit(1); 133 } 134 timeout.tv_sec = sectimeout * 60; 135 136 if (tcgetattr(0, &tty) < 0) /* get information for header */ 137 exit(1); 138 gethostname(hostname, sizeof(hostname)); 139 hostname[sizeof(hostname) - 1] = '\0'; 140 if (!(ttynam = ttyname(0))) 141 errx(1, "not a terminal?"); 142 if (gettimeofday(&timval, (struct timezone *)NULL)) 143 err(1, "gettimeofday"); 144 curtime = timval.tv_sec; 145 nexttime = timval.tv_sec + (sectimeout * 60); 146 timp = localtime(&curtime); 147 ap = asctime(timp); 148 #ifdef __SVR4 149 tzn = tzname[0]; 150 #else 151 tzn = timp->tm_zone; 152 #endif 153 154 (void)signal(SIGINT, quit); 155 (void)signal(SIGQUIT, quit); 156 ntty = tty; ntty.c_lflag &= ~ECHO; 157 (void)tcsetattr(0, TCSADRAIN, &ntty); 158 159 if (!mypw) { 160 /* get key and check again */ 161 (void)printf("Key: "); 162 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 163 quit(0); 164 (void)printf("\nAgain: "); 165 /* 166 * Don't need EOF test here, if we get EOF, then s1 != s 167 * and the right things will happen. 168 */ 169 (void)fgets(s1, sizeof(s1), stdin); 170 (void)putchar('\n'); 171 if (strcmp(s1, s)) { 172 (void)printf("\alock: passwords didn't match.\n"); 173 (void)tcsetattr(0, TCSADRAIN, &tty); 174 exit(1); 175 } 176 s[0] = '\0'; 177 mypw = s1; 178 } 179 180 /* set signal handlers */ 181 (void)signal(SIGINT, hi); 182 (void)signal(SIGQUIT, hi); 183 (void)signal(SIGTSTP, hi); 184 (void)signal(SIGALRM, bye); 185 186 ntimer.it_interval = zerotime; 187 ntimer.it_value = timeout; 188 setitimer(ITIMER_REAL, &ntimer, &otimer); 189 190 /* header info */ 191 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 192 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 193 194 for (;;) { 195 (void)printf("Key: "); 196 if (!fgets(s, sizeof(s), stdin)) { 197 clearerr(stdin); 198 hi(0); 199 continue; 200 } 201 if (usemine) { 202 s[strlen(s) - 1] = '\0'; 203 #ifdef SKEY 204 if (strcasecmp(s, "s/key") == 0) { 205 if (skey_auth(pw->pw_name)) 206 break; 207 } 208 #endif 209 if (!strcmp(mypw, crypt(s, mypw))) 210 break; 211 } 212 else if (!strcmp(s, s1)) 213 break; 214 (void)printf("\a\n"); 215 if (tcsetattr(0, TCSADRAIN, &ntty) < 0) 216 exit(1); 217 } 218 quit(0); 219 /* NOTREACHED */ 220 return (0); 221 } 222 223 #ifdef SKEY 224 /* 225 * We can't use libskey's skey_authenticate() since it 226 * handles signals in a way that's inappropriate 227 * for our needs. Instead we roll our own. 228 */ 229 int 230 skey_auth(user) 231 const char *user; 232 { 233 char s[128], *ask; 234 int ret = 0; 235 236 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 237 printf("\n[%s]\nResponse: ", ask); 238 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 239 clearerr(stdin); 240 else { 241 s[strlen(s) - 1] = '\0'; 242 if (skey_passcheck(user, s) != -1) 243 ret = 1; 244 } 245 } else 246 printf("Sorry, you have no s/key.\n"); 247 return ret; 248 } 249 #endif 250 251 void 252 hi(dummy) 253 int dummy; 254 { 255 struct timeval timval; 256 257 if (!gettimeofday(&timval, (struct timezone *)NULL)) 258 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 259 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 260 } 261 262 void 263 quit(dummy) 264 int dummy; 265 { 266 (void)putchar('\n'); 267 (void)tcsetattr(0, TCSADRAIN, &tty); 268 exit(0); 269 } 270 271 void 272 bye(dummy) 273 int dummy; 274 { 275 (void)tcsetattr(0, TCSADRAIN, &tty); 276 (void)printf("lock: timeout\n"); 277 exit(1); 278 } 279
Indexes created Tue Sep 23 02:09:52 GMT 2025