1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * 27 * $FreeBSD: src/usr.sbin/pw/pw_user.c,v 1.34.2.13 2003/02/01 21:20:10 gad Exp $ 28 * $DragonFly: src/usr.sbin/pw/pw_user.c,v 1.2 2003/06/17 04:30:02 dillon Exp $ 29 */ 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <fcntl.h> 34 #include <sys/param.h> 35 #include <dirent.h> 36 #include <paths.h> 37 #include <termios.h> 38 #include <sys/types.h> 39 #include <sys/time.h> 40 #include <sys/resource.h> 41 #include <unistd.h> 42 #include <utmp.h> 43 #include <login_cap.h> 44 #if defined(USE_MD5RAND) 45 #include <md5.h> 46 #endif 47 #include "pw.h" 48 #include "bitmap.h" 49 50 #if (MAXLOGNAME-1) > UT_NAMESIZE 51 #define LOGNAMESIZE UT_NAMESIZE 52 #else 53 #define LOGNAMESIZE (MAXLOGNAME-1) 54 #endif 55 56 static char locked_str[] = "*LOCKED*"; 57 58 static int print_user(struct passwd * pwd, int pretty, int v7); 59 static uid_t pw_uidpolicy(struct userconf * cnf, struct cargs * args); 60 static uid_t pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer); 61 static time_t pw_pwdpolicy(struct userconf * cnf, struct cargs * args); 62 static time_t pw_exppolicy(struct userconf * cnf, struct cargs * args); 63 static char *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user); 64 static char *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell); 65 static char *pw_password(struct userconf * cnf, struct cargs * args, char const * user); 66 static char *shell_path(char const * path, char *shells[], char *sh); 67 static void rmat(uid_t uid); 68 static void rmskey(char const * name); 69 70 /*- 71 * -C config configuration file 72 * -q quiet operation 73 * -n name login name 74 * -u uid user id 75 * -c comment user name/comment 76 * -d directory home directory 77 * -e date account expiry date 78 * -p date password expiry date 79 * -g grp primary group 80 * -G grp1,grp2 additional groups 81 * -m [ -k dir ] create and set up home 82 * -s shell name of login shell 83 * -o duplicate uid ok 84 * -L class user class 85 * -l name new login name 86 * -h fd password filehandle 87 * -F force print or add 88 * Setting defaults: 89 * -D set user defaults 90 * -b dir default home root dir 91 * -e period default expiry period 92 * -p period default password change period 93 * -g group default group 94 * -G grp1,grp2.. default additional groups 95 * -L class default login class 96 * -k dir default home skeleton 97 * -s shell default shell 98 * -w method default password method 99 */ 100 101 int 102 pw_user(struct userconf * cnf, int mode, struct cargs * args) 103 { 104 int rc, edited = 0; 105 char *p = NULL; 106 char *passtmp; 107 struct carg *a_name; 108 struct carg *a_uid; 109 struct carg *arg; 110 struct passwd *pwd = NULL; 111 struct group *grp; 112 struct stat st; 113 char line[_PASSWORD_LEN+1]; 114 FILE *fp; 115 116 static struct passwd fakeuser = 117 { 118 NULL, 119 "*", 120 -1, 121 -1, 122 0, 123 "", 124 "User &", 125 "/nonexistent", 126 "/bin/sh", 127 0 128 #if defined(__FreeBSD__) 129 ,0 130 #endif 131 }; 132 133 134 /* 135 * With M_NEXT, we only need to return the 136 * next uid to stdout 137 */ 138 if (mode == M_NEXT) 139 { 140 uid_t next = pw_uidpolicy(cnf, args); 141 if (getarg(args, 'q')) 142 return next; 143 printf("%ld:", (long)next); 144 pw_group(cnf, mode, args); 145 return EXIT_SUCCESS; 146 } 147 148 /* 149 * We can do all of the common legwork here 150 */ 151 152 if ((arg = getarg(args, 'b')) != NULL) { 153 cnf->home = arg->val; 154 } 155 156 /* 157 * If we'll need to use it or we're updating it, 158 * then create the base home directory if necessary 159 */ 160 if (arg != NULL || getarg(args, 'm') != NULL) { 161 int l = strlen(cnf->home); 162 163 if (l > 1 && cnf->home[l-1] == '/') /* Shave off any trailing path delimiter */ 164 cnf->home[--l] = '\0'; 165 166 if (l < 2 || *cnf->home != '/') /* Check for absolute path name */ 167 errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home); 168 169 if (stat(cnf->home, &st) == -1) { 170 char dbuf[MAXPATHLEN]; 171 172 /* 173 * This is a kludge especially for Joerg :) 174 * If the home directory would be created in the root partition, then 175 * we really create it under /usr which is likely to have more space. 176 * But we create a symlink from cnf->home -> "/usr" -> cnf->home 177 */ 178 if (strchr(cnf->home+1, '/') == NULL) { 179 strcpy(dbuf, "/usr"); 180 strncat(dbuf, cnf->home, MAXPATHLEN-5); 181 if (mkdir(dbuf, 0755) != -1 || errno == EEXIST) { 182 chown(dbuf, 0, 0); 183 symlink(dbuf, cnf->home); 184 } 185 /* If this falls, fall back to old method */ 186 } 187 p = strncpy(dbuf, cnf->home, sizeof dbuf); 188 dbuf[MAXPATHLEN-1] = '\0'; 189 if (stat(dbuf, &st) == -1) { 190 while ((p = strchr(++p, '/')) != NULL) { 191 *p = '\0'; 192 if (stat(dbuf, &st) == -1) { 193 if (mkdir(dbuf, 0755) == -1) 194 goto direrr; 195 chown(dbuf, 0, 0); 196 } else if (!S_ISDIR(st.st_mode)) 197 errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf); 198 *p = '/'; 199 } 200 } 201 if (stat(dbuf, &st) == -1) { 202 if (mkdir(dbuf, 0755) == -1) { 203 direrr: err(EX_OSFILE, "mkdir '%s'", dbuf); 204 } 205 chown(dbuf, 0, 0); 206 } 207 } else if (!S_ISDIR(st.st_mode)) 208 errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home); 209 } 210 211 if ((arg = getarg(args, 'e')) != NULL) 212 cnf->expire_days = atoi(arg->val); 213 214 if ((arg = getarg(args, 'y')) != NULL) 215 cnf->nispasswd = arg->val; 216 217 if ((arg = getarg(args, 'p')) != NULL && arg->val) 218 cnf->password_days = atoi(arg->val); 219 220 if ((arg = getarg(args, 'g')) != NULL) { 221 if (!*(p = arg->val)) /* Handle empty group list specially */ 222 cnf->default_group = ""; 223 else { 224 if ((grp = GETGRNAM(p)) == NULL) { 225 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL) 226 errx(EX_NOUSER, "group `%s' does not exist", p); 227 } 228 cnf->default_group = newstr(grp->gr_name); 229 } 230 } 231 if ((arg = getarg(args, 'L')) != NULL) 232 cnf->default_class = pw_checkname((u_char *)arg->val, 0); 233 234 if ((arg = getarg(args, 'G')) != NULL && arg->val) { 235 int i = 0; 236 237 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 238 if ((grp = GETGRNAM(p)) == NULL) { 239 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL) 240 errx(EX_NOUSER, "group `%s' does not exist", p); 241 } 242 if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1) 243 cnf->groups[i++] = newstr(grp->gr_name); 244 } 245 while (i < cnf->numgroups) 246 cnf->groups[i++] = NULL; 247 } 248 249 if ((arg = getarg(args, 'k')) != NULL) { 250 if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode)) 251 errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir); 252 } 253 254 if ((arg = getarg(args, 's')) != NULL) 255 cnf->shell_default = arg->val; 256 257 if ((arg = getarg(args, 'w')) != NULL) 258 cnf->default_password = boolean_val(arg->val, cnf->default_password); 259 if (mode == M_ADD && getarg(args, 'D')) { 260 if (getarg(args, 'n') != NULL) 261 errx(EX_DATAERR, "can't combine `-D' with `-n name'"); 262 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) { 263 if ((cnf->min_uid = (uid_t) atoi(p)) == 0) 264 cnf->min_uid = 1000; 265 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid) 266 cnf->max_uid = 32000; 267 } 268 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) { 269 if ((cnf->min_gid = (gid_t) atoi(p)) == 0) 270 cnf->min_gid = 1000; 271 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid) 272 cnf->max_gid = 32000; 273 } 274 275 arg = getarg(args, 'C'); 276 if (write_userconfig(arg ? arg->val : NULL)) 277 return EXIT_SUCCESS; 278 warn("config update"); 279 return EX_IOERR; 280 } 281 282 if (mode == M_PRINT && getarg(args, 'a')) { 283 int pretty = getarg(args, 'P') != NULL; 284 int v7 = getarg(args, '7') != NULL; 285 286 SETPWENT(); 287 while ((pwd = GETPWENT()) != NULL) 288 print_user(pwd, pretty, v7); 289 ENDPWENT(); 290 return EXIT_SUCCESS; 291 } 292 293 if ((a_name = getarg(args, 'n')) != NULL) 294 pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0)); 295 a_uid = getarg(args, 'u'); 296 297 if (a_uid == NULL) { 298 if (a_name == NULL) 299 errx(EX_DATAERR, "user name or id required"); 300 301 /* 302 * Determine whether 'n' switch is name or uid - we don't 303 * really don't really care which we have, but we need to 304 * know. 305 */ 306 if (mode != M_ADD && pwd == NULL 307 && strspn(a_name->val, "0123456789") == strlen(a_name->val) 308 && atoi(a_name->val) > 0) { /* Assume uid */ 309 (a_uid = a_name)->ch = 'u'; 310 a_name = NULL; 311 } 312 } 313 314 /* 315 * Update, delete & print require that the user exists 316 */ 317 if (mode == M_UPDATE || mode == M_DELETE || 318 mode == M_PRINT || mode == M_LOCK || mode == M_UNLOCK) { 319 320 if (a_name == NULL && pwd == NULL) /* Try harder */ 321 pwd = GETPWUID(atoi(a_uid->val)); 322 323 if (pwd == NULL) { 324 if (mode == M_PRINT && getarg(args, 'F')) { 325 fakeuser.pw_name = a_name ? a_name->val : "nouser"; 326 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1; 327 return print_user(&fakeuser, 328 getarg(args, 'P') != NULL, 329 getarg(args, '7') != NULL); 330 } 331 if (a_name == NULL) 332 errx(EX_NOUSER, "no such uid `%s'", a_uid->val); 333 errx(EX_NOUSER, "no such user `%s'", a_name->val); 334 } 335 336 if (a_name == NULL) /* May be needed later */ 337 a_name = addarg(args, 'n', newstr(pwd->pw_name)); 338 339 /* 340 * The M_LOCK and M_UNLOCK functions simply add or remove 341 * a "*LOCKED*" prefix from in front of the password to 342 * prevent it decoding correctly, and therefore prevents 343 * access. Of course, this only prevents access via 344 * password authentication (not ssh, kerberos or any 345 * other method that does not use the UNIX password) but 346 * that is a known limitation. 347 */ 348 349 if (mode == M_LOCK) { 350 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0) 351 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name); 352 passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str)); 353 if (passtmp == NULL) /* disaster */ 354 errx(EX_UNAVAILABLE, "out of memory"); 355 strcpy(passtmp, locked_str); 356 strcat(passtmp, pwd->pw_passwd); 357 pwd->pw_passwd = passtmp; 358 edited = 1; 359 } else if (mode == M_UNLOCK) { 360 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0) 361 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name); 362 pwd->pw_passwd += sizeof(locked_str)-1; 363 edited = 1; 364 } else if (mode == M_DELETE) { 365 /* 366 * Handle deletions now 367 */ 368 char file[MAXPATHLEN]; 369 char home[MAXPATHLEN]; 370 uid_t uid = pwd->pw_uid; 371 372 if (strcmp(pwd->pw_name, "root") == 0) 373 errx(EX_DATAERR, "cannot remove user 'root'"); 374 375 if (!PWALTDIR()) { 376 /* 377 * Remove skey record from /etc/skeykeys 378 */ 379 380 rmskey(pwd->pw_name); 381 382 /* 383 * Remove crontabs 384 */ 385 sprintf(file, "/var/cron/tabs/%s", pwd->pw_name); 386 if (access(file, F_OK) == 0) { 387 sprintf(file, "crontab -u %s -r", pwd->pw_name); 388 system(file); 389 } 390 } 391 /* 392 * Save these for later, since contents of pwd may be 393 * invalidated by deletion 394 */ 395 sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name); 396 strncpy(home, pwd->pw_dir, sizeof home); 397 home[sizeof home - 1] = '\0'; 398 399 rc = delpwent(pwd); 400 if (rc == -1) 401 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name); 402 else if (rc != 0) { 403 warn("passwd update"); 404 return EX_IOERR; 405 } 406 407 if (cnf->nispasswd && *cnf->nispasswd=='/') { 408 rc = delnispwent(cnf->nispasswd, a_name->val); 409 if (rc == -1) 410 warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name); 411 else if (rc != 0) 412 warn("WARNING: NIS passwd update"); 413 /* non-fatal */ 414 } 415 416 editgroups(a_name->val, NULL); 417 418 pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid); 419 420 if (!PWALTDIR()) { 421 /* 422 * Remove mail file 423 */ 424 remove(file); 425 426 /* 427 * Remove at jobs 428 */ 429 if (getpwuid(uid) == NULL) 430 rmat(uid); 431 432 /* 433 * Remove home directory and contents 434 */ 435 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) { 436 if (stat(home, &st) != -1) { 437 rm_r(home, uid); 438 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved", 439 a_name->val, (long) uid, home, 440 stat(home, &st) == -1 ? "" : "not completely "); 441 } 442 } 443 } 444 return EXIT_SUCCESS; 445 } else if (mode == M_PRINT) 446 return print_user(pwd, 447 getarg(args, 'P') != NULL, 448 getarg(args, '7') != NULL); 449 450 /* 451 * The rest is edit code 452 */ 453 if ((arg = getarg(args, 'l')) != NULL) { 454 if (strcmp(pwd->pw_name, "root") == 0) 455 errx(EX_DATAERR, "can't rename `root' account"); 456 pwd->pw_name = pw_checkname((u_char *)arg->val, 0); 457 edited = 1; 458 } 459 460 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) { 461 pwd->pw_uid = (uid_t) atol(arg->val); 462 edited = 1; 463 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0) 464 errx(EX_DATAERR, "can't change uid of `root' account"); 465 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0) 466 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name); 467 } 468 469 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) { /* Already checked this */ 470 gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid; 471 if (newgid != pwd->pw_gid) { 472 edited = 1; 473 pwd->pw_gid = newgid; 474 } 475 } 476 477 if ((arg = getarg(args, 'p')) != NULL) { 478 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 479 if (pwd->pw_change != 0) { 480 pwd->pw_change = 0; 481 edited = 1; 482 } 483 } 484 else { 485 time_t now = time(NULL); 486 time_t expire = parse_date(now, arg->val); 487 488 if (now == expire) 489 errx(EX_DATAERR, "invalid password change date `%s'", arg->val); 490 if (pwd->pw_change != expire) { 491 pwd->pw_change = expire; 492 edited = 1; 493 } 494 } 495 } 496 497 if ((arg = getarg(args, 'e')) != NULL) { 498 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 499 if (pwd->pw_expire != 0) { 500 pwd->pw_expire = 0; 501 edited = 1; 502 } 503 } 504 else { 505 time_t now = time(NULL); 506 time_t expire = parse_date(now, arg->val); 507 508 if (now == expire) 509 errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val); 510 if (pwd->pw_expire != expire) { 511 pwd->pw_expire = expire; 512 edited = 1; 513 } 514 } 515 } 516 517 if ((arg = getarg(args, 's')) != NULL) { 518 char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val); 519 if (shell == NULL) 520 shell = ""; 521 if (strcmp(shell, pwd->pw_shell) != 0) { 522 pwd->pw_shell = shell; 523 edited = 1; 524 } 525 } 526 527 if (getarg(args, 'L')) { 528 if (cnf->default_class == NULL) 529 cnf->default_class = ""; 530 if (strcmp(pwd->pw_class, cnf->default_class) != 0) { 531 pwd->pw_class = cnf->default_class; 532 edited = 1; 533 } 534 } 535 536 if ((arg = getarg(args, 'd')) != NULL) { 537 edited = strcmp(pwd->pw_dir, arg->val) != 0; 538 if (stat(pwd->pw_dir = arg->val, &st) == -1) { 539 if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0) 540 warnx("WARNING: home `%s' does not exist", pwd->pw_dir); 541 } else if (!S_ISDIR(st.st_mode)) 542 warnx("WARNING: home `%s' is not a directory", pwd->pw_dir); 543 } 544 545 if ((arg = getarg(args, 'w')) != NULL && getarg(args, 'h') == NULL) { 546 login_cap_t *lc; 547 548 lc = login_getpwclass(pwd); 549 if (lc == NULL || 550 login_setcryptfmt(lc, "md5", NULL) == NULL) 551 warn("setting crypt(3) format"); 552 login_close(lc); 553 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name); 554 edited = 1; 555 } 556 557 } else { 558 login_cap_t *lc; 559 560 /* 561 * Add code 562 */ 563 564 if (a_name == NULL) /* Required */ 565 errx(EX_DATAERR, "login name required"); 566 else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */ 567 errx(EX_DATAERR, "login name `%s' already exists", a_name->val); 568 569 /* 570 * Now, set up defaults for a new user 571 */ 572 pwd = &fakeuser; 573 pwd->pw_name = a_name->val; 574 pwd->pw_class = cnf->default_class ? cnf->default_class : ""; 575 pwd->pw_uid = pw_uidpolicy(cnf, args); 576 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid); 577 pwd->pw_change = pw_pwdpolicy(cnf, args); 578 pwd->pw_expire = pw_exppolicy(cnf, args); 579 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name); 580 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL); 581 lc = login_getpwclass(pwd); 582 if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL) 583 warn("setting crypt(3) format"); 584 login_close(lc); 585 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name); 586 edited = 1; 587 588 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0) 589 warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name); 590 } 591 592 /* 593 * Shared add/edit code 594 */ 595 if ((arg = getarg(args, 'c')) != NULL) { 596 char *gecos = pw_checkname((u_char *)arg->val, 1); 597 if (strcmp(pwd->pw_gecos, gecos) != 0) { 598 pwd->pw_gecos = gecos; 599 edited = 1; 600 } 601 } 602 603 if ((arg = getarg(args, 'h')) != NULL) { 604 if (strcmp(arg->val, "-") == 0) { 605 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') { 606 pwd->pw_passwd = "*"; /* No access */ 607 edited = 1; 608 } 609 } else { 610 int fd = atoi(arg->val); 611 int b; 612 int istty = isatty(fd); 613 struct termios t; 614 login_cap_t *lc; 615 616 if (istty) { 617 if (tcgetattr(fd, &t) == -1) 618 istty = 0; 619 else { 620 struct termios n = t; 621 622 /* Disable echo */ 623 n.c_lflag &= ~(ECHO); 624 tcsetattr(fd, TCSANOW, &n); 625 printf("%sassword for user %s:", (mode == M_UPDATE) ? "New p" : "P", pwd->pw_name); 626 fflush(stdout); 627 } 628 } 629 b = read(fd, line, sizeof(line) - 1); 630 if (istty) { /* Restore state */ 631 tcsetattr(fd, TCSANOW, &t); 632 fputc('\n', stdout); 633 fflush(stdout); 634 } 635 if (b < 0) { 636 warn("-h file descriptor"); 637 return EX_IOERR; 638 } 639 line[b] = '\0'; 640 if ((p = strpbrk(line, " \t\r\n")) != NULL) 641 *p = '\0'; 642 if (!*line) 643 errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 644 lc = login_getpwclass(pwd); 645 if (lc == NULL || 646 login_setcryptfmt(lc, "md5", NULL) == NULL) 647 warn("setting crypt(3) format"); 648 login_close(lc); 649 pwd->pw_passwd = pw_pwcrypt(line); 650 edited = 1; 651 } 652 } 653 654 /* 655 * Special case: -N only displays & exits 656 */ 657 if (getarg(args, 'N') != NULL) 658 return print_user(pwd, 659 getarg(args, 'P') != NULL, 660 getarg(args, '7') != NULL); 661 662 if (mode == M_ADD) { 663 edited = 1; /* Always */ 664 rc = addpwent(pwd); 665 if (rc == -1) { 666 warnx("user '%s' already exists", pwd->pw_name); 667 return EX_IOERR; 668 } else if (rc != 0) { 669 warn("passwd file update"); 670 return EX_IOERR; 671 } 672 if (cnf->nispasswd && *cnf->nispasswd=='/') { 673 rc = addnispwent(cnf->nispasswd, pwd); 674 if (rc == -1) 675 warnx("User '%s' already exists in NIS passwd", pwd->pw_name); 676 else 677 warn("NIS passwd update"); 678 /* NOTE: we treat NIS-only update errors as non-fatal */ 679 } 680 } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) { 681 if (edited) { /* Only updated this if required */ 682 rc = chgpwent(a_name->val, pwd); 683 if (rc == -1) { 684 warnx("user '%s' does not exist (NIS?)", pwd->pw_name); 685 return EX_IOERR; 686 } else if (rc != 0) { 687 warn("passwd file update"); 688 return EX_IOERR; 689 } 690 if ( cnf->nispasswd && *cnf->nispasswd=='/') { 691 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd); 692 if (rc == -1) 693 warn("User '%s' not found in NIS passwd", pwd->pw_name); 694 else 695 warn("NIS passwd update"); 696 /* NOTE: NIS-only update errors are not fatal */ 697 } 698 } 699 } 700 701 /* 702 * Ok, user is created or changed - now edit group file 703 */ 704 705 if (mode == M_ADD || getarg(args, 'G') != NULL) 706 editgroups(pwd->pw_name, cnf->groups); 707 708 /* go get a current version of pwd */ 709 pwd = GETPWNAM(a_name->val); 710 if (pwd == NULL) { 711 /* This will fail when we rename, so special case that */ 712 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) { 713 a_name->val = arg->val; /* update new name */ 714 pwd = GETPWNAM(a_name->val); /* refetch renamed rec */ 715 } 716 } 717 if (pwd == NULL) /* can't go on without this */ 718 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val); 719 720 grp = GETGRGID(pwd->pw_gid); 721 pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s", 722 pwd->pw_name, (long) pwd->pw_uid, 723 grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1), 724 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell); 725 726 /* 727 * If adding, let's touch and chown the user's mail file. This is not 728 * strictly necessary under BSD with a 0755 maildir but it also 729 * doesn't hurt anything to create the empty mailfile 730 */ 731 if (mode == M_ADD) { 732 if (!PWALTDIR()) { 733 sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name); 734 close(open(line, O_RDWR | O_CREAT, 0600)); /* Preserve contents & 735 * mtime */ 736 chown(line, pwd->pw_uid, pwd->pw_gid); 737 } 738 } 739 740 /* 741 * Let's create and populate the user's home directory. Note 742 * that this also `works' for editing users if -m is used, but 743 * existing files will *not* be overwritten. 744 */ 745 if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) { 746 copymkdir(pwd->pw_dir, cnf->dotdir, 0755, pwd->pw_uid, pwd->pw_gid); 747 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made", 748 pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir); 749 } 750 751 752 /* 753 * Finally, send mail to the new user as well, if we are asked to 754 */ 755 if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) { 756 FILE *pfp = popen(_PATH_SENDMAIL " -t", "w"); 757 758 if (pfp == NULL) 759 warn("sendmail"); 760 else { 761 fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name); 762 while (fgets(line, sizeof(line), fp) != NULL) { 763 /* Do substitutions? */ 764 fputs(line, pfp); 765 } 766 pclose(pfp); 767 pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent", 768 pwd->pw_name, (long) pwd->pw_uid); 769 } 770 fclose(fp); 771 } 772 773 return EXIT_SUCCESS; 774 } 775 776 777 static uid_t 778 pw_uidpolicy(struct userconf * cnf, struct cargs * args) 779 { 780 struct passwd *pwd; 781 uid_t uid = (uid_t) - 1; 782 struct carg *a_uid = getarg(args, 'u'); 783 784 /* 785 * Check the given uid, if any 786 */ 787 if (a_uid != NULL) { 788 uid = (uid_t) atol(a_uid->val); 789 790 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL) 791 errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid); 792 } else { 793 struct bitmap bm; 794 795 /* 796 * We need to allocate the next available uid under one of 797 * two policies a) Grab the first unused uid b) Grab the 798 * highest possible unused uid 799 */ 800 if (cnf->min_uid >= cnf->max_uid) { /* Sanity 801 * claus^H^H^H^Hheck */ 802 cnf->min_uid = 1000; 803 cnf->max_uid = 32000; 804 } 805 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1); 806 807 /* 808 * Now, let's fill the bitmap from the password file 809 */ 810 SETPWENT(); 811 while ((pwd = GETPWENT()) != NULL) 812 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid) 813 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid); 814 ENDPWENT(); 815 816 /* 817 * Then apply the policy, with fallback to reuse if necessary 818 */ 819 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid) 820 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid); 821 822 /* 823 * Another sanity check 824 */ 825 if (uid < cnf->min_uid || uid > cnf->max_uid) 826 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used"); 827 bm_dealloc(&bm); 828 } 829 return uid; 830 } 831 832 833 static uid_t 834 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer) 835 { 836 struct group *grp; 837 gid_t gid = (uid_t) - 1; 838 struct carg *a_gid = getarg(args, 'g'); 839 840 /* 841 * If no arg given, see if default can help out 842 */ 843 if (a_gid == NULL && cnf->default_group && *cnf->default_group) 844 a_gid = addarg(args, 'g', cnf->default_group); 845 846 /* 847 * Check the given gid, if any 848 */ 849 SETGRENT(); 850 if (a_gid != NULL) { 851 if ((grp = GETGRNAM(a_gid->val)) == NULL) { 852 gid = (gid_t) atol(a_gid->val); 853 if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL) 854 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val); 855 } 856 gid = grp->gr_gid; 857 } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) { 858 gid = grp->gr_gid; /* Already created? Use it anyway... */ 859 } else { 860 struct cargs grpargs; 861 char tmp[32]; 862 863 LIST_INIT(&grpargs); 864 addarg(&grpargs, 'n', nam); 865 866 /* 867 * We need to auto-create a group with the user's name. We 868 * can send all the appropriate output to our sister routine 869 * bit first see if we can create a group with gid==uid so we 870 * can keep the user and group ids in sync. We purposely do 871 * NOT check the gid range if we can force the sync. If the 872 * user's name dups an existing group, then the group add 873 * function will happily handle that case for us and exit. 874 */ 875 if (GETGRGID(prefer) == NULL) { 876 sprintf(tmp, "%lu", (unsigned long) prefer); 877 addarg(&grpargs, 'g', tmp); 878 } 879 if (getarg(args, 'N')) 880 { 881 addarg(&grpargs, 'N', NULL); 882 addarg(&grpargs, 'q', NULL); 883 gid = pw_group(cnf, M_NEXT, &grpargs); 884 } 885 else 886 { 887 pw_group(cnf, M_ADD, &grpargs); 888 if ((grp = GETGRNAM(nam)) != NULL) 889 gid = grp->gr_gid; 890 } 891 a_gid = grpargs.lh_first; 892 while (a_gid != NULL) { 893 struct carg *t = a_gid->list.le_next; 894 LIST_REMOVE(a_gid, list); 895 a_gid = t; 896 } 897 } 898 ENDGRENT(); 899 return gid; 900 } 901 902 903 static time_t 904 pw_pwdpolicy(struct userconf * cnf, struct cargs * args) 905 { 906 time_t result = 0; 907 time_t now = time(NULL); 908 struct carg *arg = getarg(args, 'p'); 909 910 if (arg != NULL) { 911 if ((result = parse_date(now, arg->val)) == now) 912 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 913 } else if (cnf->password_days > 0) 914 result = now + ((long) cnf->password_days * 86400L); 915 return result; 916 } 917 918 919 static time_t 920 pw_exppolicy(struct userconf * cnf, struct cargs * args) 921 { 922 time_t result = 0; 923 time_t now = time(NULL); 924 struct carg *arg = getarg(args, 'e'); 925 926 if (arg != NULL) { 927 if ((result = parse_date(now, arg->val)) == now) 928 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 929 } else if (cnf->expire_days > 0) 930 result = now + ((long) cnf->expire_days * 86400L); 931 return result; 932 } 933 934 935 static char * 936 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user) 937 { 938 struct carg *arg = getarg(args, 'd'); 939 940 if (arg) 941 return arg->val; 942 else { 943 static char home[128]; 944 945 if (cnf->home == NULL || *cnf->home == '\0') 946 errx(EX_CONFIG, "no base home directory set"); 947 sprintf(home, "%s/%s", cnf->home, user); 948 return home; 949 } 950 } 951 952 static char * 953 shell_path(char const * path, char *shells[], char *sh) 954 { 955 if (sh != NULL && (*sh == '/' || *sh == '\0')) 956 return sh; /* specified full path or forced none */ 957 else { 958 char *p; 959 char paths[_UC_MAXLINE]; 960 961 /* 962 * We need to search paths 963 */ 964 strncpy(paths, path, sizeof paths); 965 paths[sizeof paths - 1] = '\0'; 966 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) { 967 int i; 968 static char shellpath[256]; 969 970 if (sh != NULL) { 971 sprintf(shellpath, "%s/%s", p, sh); 972 if (access(shellpath, X_OK) == 0) 973 return shellpath; 974 } else 975 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) { 976 sprintf(shellpath, "%s/%s", p, shells[i]); 977 if (access(shellpath, X_OK) == 0) 978 return shellpath; 979 } 980 } 981 if (sh == NULL) 982 errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh); 983 errx(EX_CONFIG, "no default shell available or defined"); 984 return NULL; 985 } 986 } 987 988 989 static char * 990 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell) 991 { 992 char *sh = newshell; 993 struct carg *arg = getarg(args, 's'); 994 995 if (newshell == NULL && arg != NULL) 996 sh = arg->val; 997 return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default); 998 } 999 1000 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ."; 1001 1002 char * 1003 pw_pwcrypt(char *password) 1004 { 1005 int i; 1006 char salt[12]; 1007 1008 static char buf[256]; 1009 1010 /* 1011 * Calculate a salt value 1012 */ 1013 for (i = 0; i < 8; i++) 1014 salt[i] = chars[arc4random() % 63]; 1015 salt[i] = '\0'; 1016 1017 return strcpy(buf, crypt(password, salt)); 1018 } 1019 1020 #if defined(USE_MD5RAND) 1021 u_char * 1022 pw_getrand(u_char *buf, int len) /* cryptographically secure rng */ 1023 { 1024 int i; 1025 for (i=0;i<len;i+=16) { 1026 u_char ubuf[16]; 1027 1028 MD5_CTX md5_ctx; 1029 struct timeval tv, tvo; 1030 struct rusage ru; 1031 int n=0; 1032 int t; 1033 1034 MD5Init (&md5_ctx); 1035 t=getpid(); 1036 MD5Update (&md5_ctx, (u_char*)&t, sizeof t); 1037 t=getppid(); 1038 MD5Update (&md5_ctx, (u_char*)&t, sizeof t); 1039 gettimeofday (&tvo, NULL); 1040 do { 1041 getrusage (RUSAGE_SELF, &ru); 1042 MD5Update (&md5_ctx, (u_char*)&ru, sizeof ru); 1043 gettimeofday (&tv, NULL); 1044 MD5Update (&md5_ctx, (u_char*)&tv, sizeof tv); 1045 } while (n++<20 || tv.tv_usec-tvo.tv_usec<100*1000); 1046 MD5Final (ubuf, &md5_ctx); 1047 memcpy(buf+i, ubuf, MIN(16, len-i)); 1048 } 1049 return buf; 1050 } 1051 1052 #else /* Portable version */ 1053 1054 static u_char * 1055 pw_getrand(u_char *buf, int len) 1056 { 1057 int i; 1058 1059 srandomdev(); 1060 for (i = 0; i < len; i++) { 1061 unsigned long val = random(); 1062 /* Use all bits in the random value */ 1063 buf[i]=(u_char)((val >> 24) ^ (val >> 16) ^ (val >> 8) ^ val); 1064 } 1065 return buf; 1066 } 1067 1068 #endif 1069 1070 static char * 1071 pw_password(struct userconf * cnf, struct cargs * args, char const * user) 1072 { 1073 int i, l; 1074 char pwbuf[32]; 1075 u_char rndbuf[sizeof pwbuf]; 1076 1077 switch (cnf->default_password) { 1078 case -1: /* Random password */ 1079 l = (arc4random() % 8 + 8); /* 8 - 16 chars */ 1080 pw_getrand(rndbuf, l); 1081 for (i = 0; i < l; i++) 1082 pwbuf[i] = chars[rndbuf[i] % (sizeof(chars)-1)]; 1083 pwbuf[i] = '\0'; 1084 1085 /* 1086 * We give this information back to the user 1087 */ 1088 if (getarg(args, 'h') == NULL && getarg(args, 'N') == NULL) { 1089 if (isatty(STDOUT_FILENO)) 1090 printf("Password for '%s' is: ", user); 1091 printf("%s\n", pwbuf); 1092 fflush(stdout); 1093 } 1094 break; 1095 1096 case -2: /* No password at all! */ 1097 return ""; 1098 1099 case 0: /* No login - default */ 1100 default: 1101 return "*"; 1102 1103 case 1: /* user's name */ 1104 strncpy(pwbuf, user, sizeof pwbuf); 1105 pwbuf[sizeof pwbuf - 1] = '\0'; 1106 break; 1107 } 1108 return pw_pwcrypt(pwbuf); 1109 } 1110 1111 1112 static int 1113 print_user(struct passwd * pwd, int pretty, int v7) 1114 { 1115 if (!pretty) { 1116 char buf[_UC_MAXLINE]; 1117 1118 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD); 1119 fputs(buf, stdout); 1120 } else { 1121 int j; 1122 char *p; 1123 struct group *grp = GETGRGID(pwd->pw_gid); 1124 char uname[60] = "User &", office[60] = "[None]", 1125 wphone[60] = "[None]", hphone[60] = "[None]"; 1126 char acexpire[32] = "[None]", pwexpire[32] = "[None]"; 1127 struct tm * tptr; 1128 1129 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) { 1130 strncpy(uname, p, sizeof uname); 1131 uname[sizeof uname - 1] = '\0'; 1132 if ((p = strtok(NULL, ",")) != NULL) { 1133 strncpy(office, p, sizeof office); 1134 office[sizeof office - 1] = '\0'; 1135 if ((p = strtok(NULL, ",")) != NULL) { 1136 strncpy(wphone, p, sizeof wphone); 1137 wphone[sizeof wphone - 1] = '\0'; 1138 if ((p = strtok(NULL, "")) != NULL) { 1139 strncpy(hphone, p, sizeof hphone); 1140 hphone[sizeof hphone - 1] = '\0'; 1141 } 1142 } 1143 } 1144 } 1145 /* 1146 * Handle '&' in gecos field 1147 */ 1148 if ((p = strchr(uname, '&')) != NULL) { 1149 int l = strlen(pwd->pw_name); 1150 int m = strlen(p); 1151 1152 memmove(p + l, p + 1, m); 1153 memmove(p, pwd->pw_name, l); 1154 *p = (char) toupper((unsigned char)*p); 1155 } 1156 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL) 1157 strftime(acexpire, sizeof acexpire, "%c", tptr); 1158 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL) 1159 strftime(pwexpire, sizeof pwexpire, "%c", tptr); 1160 printf("Login Name: %-15s #%-12ld Group: %-15s #%ld\n" 1161 " Full Name: %s\n" 1162 " Home: %-26.26s Class: %s\n" 1163 " Shell: %-26.26s Office: %s\n" 1164 "Work Phone: %-26.26s Home Phone: %s\n" 1165 "Acc Expire: %-26.26s Pwd Expire: %s\n", 1166 pwd->pw_name, (long) pwd->pw_uid, 1167 grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid, 1168 uname, pwd->pw_dir, pwd->pw_class, 1169 pwd->pw_shell, office, wphone, hphone, 1170 acexpire, pwexpire); 1171 SETGRENT(); 1172 j = 0; 1173 while ((grp=GETGRENT()) != NULL) 1174 { 1175 int i = 0; 1176 while (grp->gr_mem[i] != NULL) 1177 { 1178 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0) 1179 { 1180 printf(j++ == 0 ? " Groups: %s" : ",%s", grp->gr_name); 1181 break; 1182 } 1183 ++i; 1184 } 1185 } 1186 ENDGRENT(); 1187 printf("%s", j ? "\n" : ""); 1188 } 1189 return EXIT_SUCCESS; 1190 } 1191 1192 char * 1193 pw_checkname(u_char *name, int gecos) 1194 { 1195 char showch[8]; 1196 u_char const *badchars, *ch, *showtype; 1197 int reject; 1198 1199 ch = name; 1200 reject = 0; 1201 if (gecos) { 1202 /* See if the name is valid as a gecos (comment) field. */ 1203 badchars = ":!@"; 1204 showtype = "gecos field"; 1205 } else { 1206 /* See if the name is valid as a userid or group. */ 1207 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\""; 1208 showtype = "userid/group name"; 1209 /* Userids and groups can not have a leading '-'. */ 1210 if (*ch == '-') 1211 reject = 1; 1212 } 1213 if (!reject) { 1214 while (*ch) { 1215 if (strchr(badchars, *ch) != NULL || *ch < ' ' || 1216 *ch == 127) { 1217 reject = 1; 1218 break; 1219 } 1220 /* 8-bit characters are only allowed in GECOS fields */ 1221 if (!gecos && (*ch & 0x80)) { 1222 reject = 1; 1223 break; 1224 } 1225 ch++; 1226 } 1227 } 1228 /* 1229 * A `$' is allowed as the final character for userids and groups, 1230 * mainly for the benefit of samba. 1231 */ 1232 if (reject && !gecos) { 1233 if (*ch == '$' && *(ch + 1) == '\0') { 1234 reject = 0; 1235 ch++; 1236 } 1237 } 1238 if (reject) { 1239 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127) 1240 ? "`%c'" : "0x%02x", *ch); 1241 errx(EX_DATAERR, "invalid character %s at position %d in %s", 1242 showch, (ch - name), showtype); 1243 } 1244 if (!gecos && (ch - name) > LOGNAMESIZE) 1245 errx(EX_DATAERR, "name too long `%s' (max is %d)", name, 1246 LOGNAMESIZE); 1247 return (char *)name; 1248 } 1249 1250 1251 static void 1252 rmat(uid_t uid) 1253 { 1254 DIR *d = opendir("/var/at/jobs"); 1255 1256 if (d != NULL) { 1257 struct dirent *e; 1258 1259 while ((e = readdir(d)) != NULL) { 1260 struct stat st; 1261 1262 if (strncmp(e->d_name, ".lock", 5) != 0 && 1263 stat(e->d_name, &st) == 0 && 1264 !S_ISDIR(st.st_mode) && 1265 st.st_uid == uid) { 1266 char tmp[MAXPATHLEN]; 1267 1268 sprintf(tmp, "/usr/bin/atrm %s", e->d_name); 1269 system(tmp); 1270 } 1271 } 1272 closedir(d); 1273 } 1274 } 1275 1276 static void 1277 rmskey(char const * name) 1278 { 1279 static const char etcskey[] = "/etc/skeykeys"; 1280 FILE *fp = fopen(etcskey, "r+"); 1281 1282 if (fp != NULL) { 1283 char tmp[1024]; 1284 off_t atofs = 0; 1285 int length = strlen(name); 1286 1287 while (fgets(tmp, sizeof tmp, fp) != NULL) { 1288 if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') { 1289 if (fseek(fp, atofs, SEEK_SET) == 0) { 1290 fwrite("#", 1, 1, fp); /* Comment username out */ 1291 } 1292 break; 1293 } 1294 atofs = ftell(fp); 1295 } 1296 /* 1297 * If we got an error of any sort, don't update! 1298 */ 1299 fclose(fp); 1300 } 1301 } 1302 1303