1 /* $NetBSD: lock.c,v 1.8 1996/05/07 18:32:31 jtc 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 1.8 1996/05/07 18:32:31 jtc 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 74 #define TIMEOUT 15 75 76 void quit(), bye(), hi(); 77 78 struct timeval timeout; 79 struct timeval zerotime; 80 struct termios tty, ntty; 81 long nexttime; /* keep the timeout time */ 82 83 /*ARGSUSED*/ 84 main(argc, argv) 85 int argc; 86 char **argv; 87 { 88 extern char *optarg; 89 struct passwd *pw; 90 struct timeval timval; 91 struct itimerval ntimer, otimer; 92 struct tm *timp; 93 time_t curtime; 94 int ch, sectimeout, usemine; 95 char *ap, *mypw, *ttynam, *tzn; 96 char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ]; 97 char *crypt(); 98 99 sectimeout = TIMEOUT; 100 mypw = NULL; 101 usemine = 0; 102 103 if (!(pw = getpwuid(getuid()))) 104 errx(1, "unknown uid %d.", getuid()); 105 106 while ((ch = getopt(argc, argv, "pt:")) != EOF) 107 switch((char)ch) { 108 case 't': 109 if ((sectimeout = atoi(optarg)) <= 0) 110 errx(1, "illegal timeout value: %s", optarg); 111 break; 112 case 'p': 113 usemine = 1; 114 mypw = strdup(pw->pw_passwd); 115 break; 116 case '?': 117 default: 118 (void)fprintf(stderr, 119 "usage: lock [-p] [-t timeout]\n"); 120 exit(1); 121 } 122 timeout.tv_sec = sectimeout * 60; 123 124 setuid(getuid()); /* discard privs */ 125 126 if (tcgetattr(0, &tty) < 0) /* get information for header */ 127 exit(1); 128 gethostname(hostname, sizeof(hostname)); 129 if (!(ttynam = ttyname(0))) 130 errx(1, "not a terminal?"); 131 if (gettimeofday(&timval, (struct timezone *)NULL)) 132 err(1, "gettimeofday"); 133 curtime = timval.tv_sec; 134 nexttime = timval.tv_sec + (sectimeout * 60); 135 timp = localtime(&curtime); 136 ap = asctime(timp); 137 tzn = timp->tm_zone; 138 139 (void)signal(SIGINT, quit); 140 (void)signal(SIGQUIT, quit); 141 ntty = tty; ntty.c_lflag &= ~ECHO; 142 (void)tcsetattr(0, TCSADRAIN, &ntty); 143 144 if (!mypw) { 145 /* get key and check again */ 146 (void)printf("Key: "); 147 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 148 quit(); 149 (void)printf("\nAgain: "); 150 /* 151 * Don't need EOF test here, if we get EOF, then s1 != s 152 * and the right things will happen. 153 */ 154 (void)fgets(s1, sizeof(s1), stdin); 155 (void)putchar('\n'); 156 if (strcmp(s1, s)) { 157 (void)printf("\alock: passwords didn't match.\n"); 158 (void)tcsetattr(0, TCSADRAIN, &tty); 159 exit(1); 160 } 161 s[0] = NULL; 162 mypw = s1; 163 } 164 165 /* set signal handlers */ 166 (void)signal(SIGINT, hi); 167 (void)signal(SIGQUIT, hi); 168 (void)signal(SIGTSTP, hi); 169 (void)signal(SIGALRM, bye); 170 171 ntimer.it_interval = zerotime; 172 ntimer.it_value = timeout; 173 setitimer(ITIMER_REAL, &ntimer, &otimer); 174 175 /* header info */ 176 (void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s", 177 ttynam, hostname, sectimeout, ap, tzn, ap + 19); 178 179 for (;;) { 180 (void)printf("Key: "); 181 if (!fgets(s, sizeof(s), stdin)) { 182 clearerr(stdin); 183 hi(); 184 continue; 185 } 186 if (usemine) { 187 s[strlen(s) - 1] = '\0'; 188 #ifdef SKEY 189 if (strcasecmp(s, "s/key") == 0) { 190 if (skey_auth(pw->pw_name)) 191 break; 192 } 193 #endif 194 if (!strcmp(mypw, crypt(s, mypw))) 195 break; 196 } 197 else if (!strcmp(s, s1)) 198 break; 199 (void)printf("\a\n"); 200 if (tcsetattr(0, TCSADRAIN, &ntty) < 0) 201 exit(1); 202 } 203 quit(); 204 } 205 206 #ifdef SKEY 207 /* 208 * We can't use libskey's skey_authenticate() since it 209 * handles signals in a way that's inappropriate 210 * for our needs. Instead we roll our own. 211 */ 212 int 213 skey_auth(char *user) 214 { 215 char s[128], *ask, *skey_keyinfo __P((char *name)); 216 int ret = 0; 217 218 if (!skey_haskey(user) && (ask = skey_keyinfo(user))) { 219 printf("\n[%s]\nResponse: ", ask); 220 if (!fgets(s, sizeof(s), stdin) || *s == '\n') 221 clearerr(stdin); 222 else { 223 s[strlen(s) - 1] = '\0'; 224 if (skey_passcheck(user, s) != -1) 225 ret = 1; 226 } 227 } else 228 printf("Sorry, you have no s/key.\n"); 229 return ret; 230 } 231 #endif 232 233 void 234 hi() 235 { 236 struct timeval timval; 237 238 if (!gettimeofday(&timval, (struct timezone *)NULL)) 239 (void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n", 240 (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60); 241 } 242 243 void 244 quit() 245 { 246 (void)putchar('\n'); 247 (void)tcsetattr(0, TCSADRAIN, &tty); 248 exit(0); 249 } 250 251 void 252 bye() 253 { 254 (void)tcsetattr(0, TCSADRAIN, &tty); 255 (void)printf("lock: timeout\n"); 256 exit(1); 257 } 258