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 1.4 2004/11/30 20:12:21 joerg 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(__DragonFly__) 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 strlcpy(home, pwd->pw_dir, sizeof home); 397 398 rc = delpwent(pwd); 399 if (rc == -1) 400 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name); 401 else if (rc != 0) { 402 warn("passwd update"); 403 return EX_IOERR; 404 } 405 406 if (cnf->nispasswd && *cnf->nispasswd=='/') { 407 rc = delnispwent(cnf->nispasswd, a_name->val); 408 if (rc == -1) 409 warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name); 410 else if (rc != 0) 411 warn("WARNING: NIS passwd update"); 412 /* non-fatal */ 413 } 414 415 editgroups(a_name->val, NULL); 416 417 pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid); 418 419 if (!PWALTDIR()) { 420 /* 421 * Remove mail file 422 */ 423 remove(file); 424 425 /* 426 * Remove at jobs 427 */ 428 if (getpwuid(uid) == NULL) 429 rmat(uid); 430 431 /* 432 * Remove home directory and contents 433 */ 434 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) { 435 if (stat(home, &st) != -1) { 436 rm_r(home, uid); 437 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved", 438 a_name->val, (long) uid, home, 439 stat(home, &st) == -1 ? "" : "not completely "); 440 } 441 } 442 } 443 return EXIT_SUCCESS; 444 } else if (mode == M_PRINT) 445 return print_user(pwd, 446 getarg(args, 'P') != NULL, 447 getarg(args, '7') != NULL); 448 449 /* 450 * The rest is edit code 451 */ 452 if ((arg = getarg(args, 'l')) != NULL) { 453 if (strcmp(pwd->pw_name, "root") == 0) 454 errx(EX_DATAERR, "can't rename `root' account"); 455 pwd->pw_name = pw_checkname((u_char *)arg->val, 0); 456 edited = 1; 457 } 458 459 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) { 460 pwd->pw_uid = (uid_t) atol(arg->val); 461 edited = 1; 462 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0) 463 errx(EX_DATAERR, "can't change uid of `root' account"); 464 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0) 465 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name); 466 } 467 468 if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) { /* Already checked this */ 469 gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid; 470 if (newgid != pwd->pw_gid) { 471 edited = 1; 472 pwd->pw_gid = newgid; 473 } 474 } 475 476 if ((arg = getarg(args, 'p')) != NULL) { 477 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 478 if (pwd->pw_change != 0) { 479 pwd->pw_change = 0; 480 edited = 1; 481 } 482 } 483 else { 484 time_t now = time(NULL); 485 time_t expire = parse_date(now, arg->val); 486 487 if (now == expire) 488 errx(EX_DATAERR, "invalid password change date `%s'", arg->val); 489 if (pwd->pw_change != expire) { 490 pwd->pw_change = expire; 491 edited = 1; 492 } 493 } 494 } 495 496 if ((arg = getarg(args, 'e')) != NULL) { 497 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 498 if (pwd->pw_expire != 0) { 499 pwd->pw_expire = 0; 500 edited = 1; 501 } 502 } 503 else { 504 time_t now = time(NULL); 505 time_t expire = parse_date(now, arg->val); 506 507 if (now == expire) 508 errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val); 509 if (pwd->pw_expire != expire) { 510 pwd->pw_expire = expire; 511 edited = 1; 512 } 513 } 514 } 515 516 if ((arg = getarg(args, 's')) != NULL) { 517 char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val); 518 if (shell == NULL) 519 shell = ""; 520 if (strcmp(shell, pwd->pw_shell) != 0) { 521 pwd->pw_shell = shell; 522 edited = 1; 523 } 524 } 525 526 if (getarg(args, 'L')) { 527 if (cnf->default_class == NULL) 528 cnf->default_class = ""; 529 if (strcmp(pwd->pw_class, cnf->default_class) != 0) { 530 pwd->pw_class = cnf->default_class; 531 edited = 1; 532 } 533 } 534 535 if ((arg = getarg(args, 'd')) != NULL) { 536 edited = strcmp(pwd->pw_dir, arg->val) != 0; 537 if (stat(pwd->pw_dir = arg->val, &st) == -1) { 538 if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0) 539 warnx("WARNING: home `%s' does not exist", pwd->pw_dir); 540 } else if (!S_ISDIR(st.st_mode)) 541 warnx("WARNING: home `%s' is not a directory", pwd->pw_dir); 542 } 543 544 if ((arg = getarg(args, 'w')) != NULL && getarg(args, 'h') == NULL) { 545 login_cap_t *lc; 546 547 lc = login_getpwclass(pwd); 548 if (lc == NULL || 549 login_setcryptfmt(lc, "md5", NULL) == NULL) 550 warn("setting crypt(3) format"); 551 login_close(lc); 552 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name); 553 edited = 1; 554 } 555 556 } else { 557 login_cap_t *lc; 558 559 /* 560 * Add code 561 */ 562 563 if (a_name == NULL) /* Required */ 564 errx(EX_DATAERR, "login name required"); 565 else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */ 566 errx(EX_DATAERR, "login name `%s' already exists", a_name->val); 567 568 /* 569 * Now, set up defaults for a new user 570 */ 571 pwd = &fakeuser; 572 pwd->pw_name = a_name->val; 573 pwd->pw_class = cnf->default_class ? cnf->default_class : ""; 574 pwd->pw_uid = pw_uidpolicy(cnf, args); 575 pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid); 576 pwd->pw_change = pw_pwdpolicy(cnf, args); 577 pwd->pw_expire = pw_exppolicy(cnf, args); 578 pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name); 579 pwd->pw_shell = pw_shellpolicy(cnf, args, NULL); 580 lc = login_getpwclass(pwd); 581 if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL) 582 warn("setting crypt(3) format"); 583 login_close(lc); 584 pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name); 585 edited = 1; 586 587 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0) 588 warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name); 589 } 590 591 /* 592 * Shared add/edit code 593 */ 594 if ((arg = getarg(args, 'c')) != NULL) { 595 char *gecos = pw_checkname((u_char *)arg->val, 1); 596 if (strcmp(pwd->pw_gecos, gecos) != 0) { 597 pwd->pw_gecos = gecos; 598 edited = 1; 599 } 600 } 601 602 if ((arg = getarg(args, 'h')) != NULL) { 603 if (strcmp(arg->val, "-") == 0) { 604 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') { 605 pwd->pw_passwd = "*"; /* No access */ 606 edited = 1; 607 } 608 } else { 609 int fd = atoi(arg->val); 610 int b; 611 int istty = isatty(fd); 612 struct termios t; 613 login_cap_t *lc; 614 615 if (istty) { 616 if (tcgetattr(fd, &t) == -1) 617 istty = 0; 618 else { 619 struct termios n = t; 620 621 /* Disable echo */ 622 n.c_lflag &= ~(ECHO); 623 tcsetattr(fd, TCSANOW, &n); 624 printf("%sassword for user %s:", (mode == M_UPDATE) ? "New p" : "P", pwd->pw_name); 625 fflush(stdout); 626 } 627 } 628 b = read(fd, line, sizeof(line) - 1); 629 if (istty) { /* Restore state */ 630 tcsetattr(fd, TCSANOW, &t); 631 fputc('\n', stdout); 632 fflush(stdout); 633 } 634 if (b < 0) { 635 warn("-h file descriptor"); 636 return EX_IOERR; 637 } 638 line[b] = '\0'; 639 if ((p = strpbrk(line, " \t\r\n")) != NULL) 640 *p = '\0'; 641 if (!*line) 642 errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 643 lc = login_getpwclass(pwd); 644 if (lc == NULL || 645 login_setcryptfmt(lc, "md5", NULL) == NULL) 646 warn("setting crypt(3) format"); 647 login_close(lc); 648 pwd->pw_passwd = pw_pwcrypt(line); 649 edited = 1; 650 } 651 } 652 653 /* 654 * Special case: -N only displays & exits 655 */ 656 if (getarg(args, 'N') != NULL) 657 return print_user(pwd, 658 getarg(args, 'P') != NULL, 659 getarg(args, '7') != NULL); 660 661 if (mode == M_ADD) { 662 edited = 1; /* Always */ 663 rc = addpwent(pwd); 664 if (rc == -1) { 665 warnx("user '%s' already exists", pwd->pw_name); 666 return EX_IOERR; 667 } else if (rc != 0) { 668 warn("passwd file update"); 669 return EX_IOERR; 670 } 671 if (cnf->nispasswd && *cnf->nispasswd=='/') { 672 rc = addnispwent(cnf->nispasswd, pwd); 673 if (rc == -1) 674 warnx("User '%s' already exists in NIS passwd", pwd->pw_name); 675 else 676 warn("NIS passwd update"); 677 /* NOTE: we treat NIS-only update errors as non-fatal */ 678 } 679 } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) { 680 if (edited) { /* Only updated this if required */ 681 rc = chgpwent(a_name->val, pwd); 682 if (rc == -1) { 683 warnx("user '%s' does not exist (NIS?)", pwd->pw_name); 684 return EX_IOERR; 685 } else if (rc != 0) { 686 warn("passwd file update"); 687 return EX_IOERR; 688 } 689 if ( cnf->nispasswd && *cnf->nispasswd=='/') { 690 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd); 691 if (rc == -1) 692 warn("User '%s' not found in NIS passwd", pwd->pw_name); 693 else 694 warn("NIS passwd update"); 695 /* NOTE: NIS-only update errors are not fatal */ 696 } 697 } 698 } 699 700 /* 701 * Ok, user is created or changed - now edit group file 702 */ 703 704 if (mode == M_ADD || getarg(args, 'G') != NULL) 705 editgroups(pwd->pw_name, cnf->groups); 706 707 /* go get a current version of pwd */ 708 pwd = GETPWNAM(a_name->val); 709 if (pwd == NULL) { 710 /* This will fail when we rename, so special case that */ 711 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) { 712 a_name->val = arg->val; /* update new name */ 713 pwd = GETPWNAM(a_name->val); /* refetch renamed rec */ 714 } 715 } 716 if (pwd == NULL) /* can't go on without this */ 717 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val); 718 719 grp = GETGRGID(pwd->pw_gid); 720 pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s", 721 pwd->pw_name, (long) pwd->pw_uid, 722 grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1), 723 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell); 724 725 /* 726 * If adding, let's touch and chown the user's mail file. This is not 727 * strictly necessary under BSD with a 0755 maildir but it also 728 * doesn't hurt anything to create the empty mailfile 729 */ 730 if (mode == M_ADD) { 731 if (!PWALTDIR()) { 732 sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name); 733 close(open(line, O_RDWR | O_CREAT, 0600)); /* Preserve contents & 734 * mtime */ 735 chown(line, pwd->pw_uid, pwd->pw_gid); 736 } 737 } 738 739 /* 740 * Let's create and populate the user's home directory. Note 741 * that this also `works' for editing users if -m is used, but 742 * existing files will *not* be overwritten. 743 */ 744 if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) { 745 copymkdir(pwd->pw_dir, cnf->dotdir, 0755, pwd->pw_uid, pwd->pw_gid); 746 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made", 747 pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir); 748 } 749 750 751 /* 752 * Finally, send mail to the new user as well, if we are asked to 753 */ 754 if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) { 755 FILE *pfp = popen(_PATH_SENDMAIL " -t", "w"); 756 757 if (pfp == NULL) 758 warn("sendmail"); 759 else { 760 fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name); 761 while (fgets(line, sizeof(line), fp) != NULL) { 762 /* Do substitutions? */ 763 fputs(line, pfp); 764 } 765 pclose(pfp); 766 pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent", 767 pwd->pw_name, (long) pwd->pw_uid); 768 } 769 fclose(fp); 770 } 771 772 return EXIT_SUCCESS; 773 } 774 775 776 static uid_t 777 pw_uidpolicy(struct userconf * cnf, struct cargs * args) 778 { 779 struct passwd *pwd; 780 uid_t uid = (uid_t) - 1; 781 struct carg *a_uid = getarg(args, 'u'); 782 783 /* 784 * Check the given uid, if any 785 */ 786 if (a_uid != NULL) { 787 uid = (uid_t) atol(a_uid->val); 788 789 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL) 790 errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid); 791 } else { 792 struct bitmap bm; 793 794 /* 795 * We need to allocate the next available uid under one of 796 * two policies a) Grab the first unused uid b) Grab the 797 * highest possible unused uid 798 */ 799 if (cnf->min_uid >= cnf->max_uid) { /* Sanity 800 * claus^H^H^H^Hheck */ 801 cnf->min_uid = 1000; 802 cnf->max_uid = 32000; 803 } 804 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1); 805 806 /* 807 * Now, let's fill the bitmap from the password file 808 */ 809 SETPWENT(); 810 while ((pwd = GETPWENT()) != NULL) 811 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid) 812 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid); 813 ENDPWENT(); 814 815 /* 816 * Then apply the policy, with fallback to reuse if necessary 817 */ 818 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid) 819 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid); 820 821 /* 822 * Another sanity check 823 */ 824 if (uid < cnf->min_uid || uid > cnf->max_uid) 825 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used"); 826 bm_dealloc(&bm); 827 } 828 return uid; 829 } 830 831 832 static uid_t 833 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer) 834 { 835 struct group *grp; 836 gid_t gid = (uid_t) - 1; 837 struct carg *a_gid = getarg(args, 'g'); 838 839 /* 840 * If no arg given, see if default can help out 841 */ 842 if (a_gid == NULL && cnf->default_group && *cnf->default_group) 843 a_gid = addarg(args, 'g', cnf->default_group); 844 845 /* 846 * Check the given gid, if any 847 */ 848 SETGRENT(); 849 if (a_gid != NULL) { 850 if ((grp = GETGRNAM(a_gid->val)) == NULL) { 851 gid = (gid_t) atol(a_gid->val); 852 if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL) 853 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val); 854 } 855 gid = grp->gr_gid; 856 } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) { 857 gid = grp->gr_gid; /* Already created? Use it anyway... */ 858 } else { 859 struct cargs grpargs; 860 char tmp[32]; 861 862 LIST_INIT(&grpargs); 863 addarg(&grpargs, 'n', nam); 864 865 /* 866 * We need to auto-create a group with the user's name. We 867 * can send all the appropriate output to our sister routine 868 * bit first see if we can create a group with gid==uid so we 869 * can keep the user and group ids in sync. We purposely do 870 * NOT check the gid range if we can force the sync. If the 871 * user's name dups an existing group, then the group add 872 * function will happily handle that case for us and exit. 873 */ 874 if (GETGRGID(prefer) == NULL) { 875 sprintf(tmp, "%lu", (unsigned long) prefer); 876 addarg(&grpargs, 'g', tmp); 877 } 878 if (getarg(args, 'N')) 879 { 880 addarg(&grpargs, 'N', NULL); 881 addarg(&grpargs, 'q', NULL); 882 gid = pw_group(cnf, M_NEXT, &grpargs); 883 } 884 else 885 { 886 pw_group(cnf, M_ADD, &grpargs); 887 if ((grp = GETGRNAM(nam)) != NULL) 888 gid = grp->gr_gid; 889 } 890 a_gid = grpargs.lh_first; 891 while (a_gid != NULL) { 892 struct carg *t = a_gid->list.le_next; 893 LIST_REMOVE(a_gid, list); 894 a_gid = t; 895 } 896 } 897 ENDGRENT(); 898 return gid; 899 } 900 901 902 static time_t 903 pw_pwdpolicy(struct userconf * cnf, struct cargs * args) 904 { 905 time_t result = 0; 906 time_t now = time(NULL); 907 struct carg *arg = getarg(args, 'p'); 908 909 if (arg != NULL) { 910 if ((result = parse_date(now, arg->val)) == now) 911 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 912 } else if (cnf->password_days > 0) 913 result = now + ((long) cnf->password_days * 86400L); 914 return result; 915 } 916 917 918 static time_t 919 pw_exppolicy(struct userconf * cnf, struct cargs * args) 920 { 921 time_t result = 0; 922 time_t now = time(NULL); 923 struct carg *arg = getarg(args, 'e'); 924 925 if (arg != NULL) { 926 if ((result = parse_date(now, arg->val)) == now) 927 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 928 } else if (cnf->expire_days > 0) 929 result = now + ((long) cnf->expire_days * 86400L); 930 return result; 931 } 932 933 934 static char * 935 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user) 936 { 937 struct carg *arg = getarg(args, 'd'); 938 939 if (arg) 940 return arg->val; 941 else { 942 static char home[128]; 943 944 if (cnf->home == NULL || *cnf->home == '\0') 945 errx(EX_CONFIG, "no base home directory set"); 946 sprintf(home, "%s/%s", cnf->home, user); 947 return home; 948 } 949 } 950 951 static char * 952 shell_path(char const * path, char *shells[], char *sh) 953 { 954 if (sh != NULL && (*sh == '/' || *sh == '\0')) 955 return sh; /* specified full path or forced none */ 956 else { 957 char *p; 958 char paths[_UC_MAXLINE]; 959 960 /* 961 * We need to search paths 962 */ 963 strncpy(paths, path, sizeof paths); 964 paths[sizeof paths - 1] = '\0'; 965 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) { 966 int i; 967 static char shellpath[256]; 968 969 if (sh != NULL) { 970 sprintf(shellpath, "%s/%s", p, sh); 971 if (access(shellpath, X_OK) == 0) 972 return shellpath; 973 } else 974 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) { 975 sprintf(shellpath, "%s/%s", p, shells[i]); 976 if (access(shellpath, X_OK) == 0) 977 return shellpath; 978 } 979 } 980 if (sh == NULL) 981 errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh); 982 errx(EX_CONFIG, "no default shell available or defined"); 983 return NULL; 984 } 985 } 986 987 988 static char * 989 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell) 990 { 991 char *sh = newshell; 992 struct carg *arg = getarg(args, 's'); 993 994 if (newshell == NULL && arg != NULL) 995 sh = arg->val; 996 return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default); 997 } 998 999 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ."; 1000 1001 char * 1002 pw_pwcrypt(char *password) 1003 { 1004 int i; 1005 char salt[12]; 1006 char *cryptpw; 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 cryptpw = crypt(password, salt); 1018 if (cryptpw == NULL) 1019 errx(EX_CONFIG, "crypt(3) failure"); 1020 return strcpy(buf, cryptpw); 1021 } 1022 1023 #if defined(USE_MD5RAND) 1024 u_char * 1025 pw_getrand(u_char *buf, int len) /* cryptographically secure rng */ 1026 { 1027 int i; 1028 for (i=0;i<len;i+=16) { 1029 u_char ubuf[16]; 1030 1031 MD5_CTX md5_ctx; 1032 struct timeval tv, tvo; 1033 struct rusage ru; 1034 int n=0; 1035 int t; 1036 1037 MD5Init (&md5_ctx); 1038 t=getpid(); 1039 MD5Update (&md5_ctx, (u_char*)&t, sizeof t); 1040 t=getppid(); 1041 MD5Update (&md5_ctx, (u_char*)&t, sizeof t); 1042 gettimeofday (&tvo, NULL); 1043 do { 1044 getrusage (RUSAGE_SELF, &ru); 1045 MD5Update (&md5_ctx, (u_char*)&ru, sizeof ru); 1046 gettimeofday (&tv, NULL); 1047 MD5Update (&md5_ctx, (u_char*)&tv, sizeof tv); 1048 } while (n++<20 || tv.tv_usec-tvo.tv_usec<100*1000); 1049 MD5Final (ubuf, &md5_ctx); 1050 memcpy(buf+i, ubuf, MIN(16, len-i)); 1051 } 1052 return buf; 1053 } 1054 1055 #else /* Portable version */ 1056 1057 static u_char * 1058 pw_getrand(u_char *buf, int len) 1059 { 1060 int i; 1061 1062 srandomdev(); 1063 for (i = 0; i < len; i++) { 1064 unsigned long val = random(); 1065 /* Use all bits in the random value */ 1066 buf[i]=(u_char)((val >> 24) ^ (val >> 16) ^ (val >> 8) ^ val); 1067 } 1068 return buf; 1069 } 1070 1071 #endif 1072 1073 static char * 1074 pw_password(struct userconf * cnf, struct cargs * args, char const * user) 1075 { 1076 int i, l; 1077 char pwbuf[32]; 1078 u_char rndbuf[sizeof pwbuf]; 1079 1080 switch (cnf->default_password) { 1081 case -1: /* Random password */ 1082 l = (arc4random() % 8 + 8); /* 8 - 16 chars */ 1083 pw_getrand(rndbuf, l); 1084 for (i = 0; i < l; i++) 1085 pwbuf[i] = chars[rndbuf[i] % (sizeof(chars)-1)]; 1086 pwbuf[i] = '\0'; 1087 1088 /* 1089 * We give this information back to the user 1090 */ 1091 if (getarg(args, 'h') == NULL && getarg(args, 'N') == NULL) { 1092 if (isatty(STDOUT_FILENO)) 1093 printf("Password for '%s' is: ", user); 1094 printf("%s\n", pwbuf); 1095 fflush(stdout); 1096 } 1097 break; 1098 1099 case -2: /* No password at all! */ 1100 return ""; 1101 1102 case 0: /* No login - default */ 1103 default: 1104 return "*"; 1105 1106 case 1: /* user's name */ 1107 strncpy(pwbuf, user, sizeof pwbuf); 1108 pwbuf[sizeof pwbuf - 1] = '\0'; 1109 break; 1110 } 1111 return pw_pwcrypt(pwbuf); 1112 } 1113 1114 1115 static int 1116 print_user(struct passwd * pwd, int pretty, int v7) 1117 { 1118 if (!pretty) { 1119 char buf[_UC_MAXLINE]; 1120 1121 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD); 1122 fputs(buf, stdout); 1123 } else { 1124 int j; 1125 char *p; 1126 struct group *grp = GETGRGID(pwd->pw_gid); 1127 char uname[60] = "User &", office[60] = "[None]", 1128 wphone[60] = "[None]", hphone[60] = "[None]"; 1129 char acexpire[32] = "[None]", pwexpire[32] = "[None]"; 1130 struct tm * tptr; 1131 1132 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) { 1133 strncpy(uname, p, sizeof uname); 1134 uname[sizeof uname - 1] = '\0'; 1135 if ((p = strtok(NULL, ",")) != NULL) { 1136 strncpy(office, p, sizeof office); 1137 office[sizeof office - 1] = '\0'; 1138 if ((p = strtok(NULL, ",")) != NULL) { 1139 strncpy(wphone, p, sizeof wphone); 1140 wphone[sizeof wphone - 1] = '\0'; 1141 if ((p = strtok(NULL, "")) != NULL) { 1142 strncpy(hphone, p, sizeof hphone); 1143 hphone[sizeof hphone - 1] = '\0'; 1144 } 1145 } 1146 } 1147 } 1148 /* 1149 * Handle '&' in gecos field 1150 */ 1151 if ((p = strchr(uname, '&')) != NULL) { 1152 int l = strlen(pwd->pw_name); 1153 int m = strlen(p); 1154 1155 memmove(p + l, p + 1, m); 1156 memmove(p, pwd->pw_name, l); 1157 *p = (char) toupper((unsigned char)*p); 1158 } 1159 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL) 1160 strftime(acexpire, sizeof acexpire, "%c", tptr); 1161 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL) 1162 strftime(pwexpire, sizeof pwexpire, "%c", tptr); 1163 printf("Login Name: %-15s #%-12ld Group: %-15s #%ld\n" 1164 " Full Name: %s\n" 1165 " Home: %-26.26s Class: %s\n" 1166 " Shell: %-26.26s Office: %s\n" 1167 "Work Phone: %-26.26s Home Phone: %s\n" 1168 "Acc Expire: %-26.26s Pwd Expire: %s\n", 1169 pwd->pw_name, (long) pwd->pw_uid, 1170 grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid, 1171 uname, pwd->pw_dir, pwd->pw_class, 1172 pwd->pw_shell, office, wphone, hphone, 1173 acexpire, pwexpire); 1174 SETGRENT(); 1175 j = 0; 1176 while ((grp=GETGRENT()) != NULL) 1177 { 1178 int i = 0; 1179 while (grp->gr_mem[i] != NULL) 1180 { 1181 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0) 1182 { 1183 printf(j++ == 0 ? " Groups: %s" : ",%s", grp->gr_name); 1184 break; 1185 } 1186 ++i; 1187 } 1188 } 1189 ENDGRENT(); 1190 printf("%s", j ? "\n" : ""); 1191 } 1192 return EXIT_SUCCESS; 1193 } 1194 1195 char * 1196 pw_checkname(u_char *name, int gecos) 1197 { 1198 char showch[8]; 1199 u_char const *badchars, *ch, *showtype; 1200 int reject; 1201 1202 ch = name; 1203 reject = 0; 1204 if (gecos) { 1205 /* See if the name is valid as a gecos (comment) field. */ 1206 badchars = ":!@"; 1207 showtype = "gecos field"; 1208 } else { 1209 /* See if the name is valid as a userid or group. */ 1210 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\""; 1211 showtype = "userid/group name"; 1212 /* Userids and groups can not have a leading '-'. */ 1213 if (*ch == '-') 1214 reject = 1; 1215 } 1216 if (!reject) { 1217 while (*ch) { 1218 if (strchr(badchars, *ch) != NULL || *ch < ' ' || 1219 *ch == 127) { 1220 reject = 1; 1221 break; 1222 } 1223 /* 8-bit characters are only allowed in GECOS fields */ 1224 if (!gecos && (*ch & 0x80)) { 1225 reject = 1; 1226 break; 1227 } 1228 ch++; 1229 } 1230 } 1231 /* 1232 * A `$' is allowed as the final character for userids and groups, 1233 * mainly for the benefit of samba. 1234 */ 1235 if (reject && !gecos) { 1236 if (*ch == '$' && *(ch + 1) == '\0') { 1237 reject = 0; 1238 ch++; 1239 } 1240 } 1241 if (reject) { 1242 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127) 1243 ? "`%c'" : "0x%02x", *ch); 1244 errx(EX_DATAERR, "invalid character %s at position %td in %s", 1245 showch, (ch - name), showtype); 1246 } 1247 if (!gecos && (ch - name) > LOGNAMESIZE) 1248 errx(EX_DATAERR, "name too long `%s' (max is %d)", name, 1249 LOGNAMESIZE); 1250 return (char *)name; 1251 } 1252 1253 1254 static void 1255 rmat(uid_t uid) 1256 { 1257 DIR *d = opendir("/var/at/jobs"); 1258 1259 if (d != NULL) { 1260 struct dirent *e; 1261 1262 while ((e = readdir(d)) != NULL) { 1263 struct stat st; 1264 1265 if (strncmp(e->d_name, ".lock", 5) != 0 && 1266 stat(e->d_name, &st) == 0 && 1267 !S_ISDIR(st.st_mode) && 1268 st.st_uid == uid) { 1269 char tmp[MAXPATHLEN]; 1270 1271 sprintf(tmp, "/usr/bin/atrm %s", e->d_name); 1272 system(tmp); 1273 } 1274 } 1275 closedir(d); 1276 } 1277 } 1278 1279 static void 1280 rmskey(char const * name) 1281 { 1282 static const char etcskey[] = "/etc/skeykeys"; 1283 FILE *fp = fopen(etcskey, "r+"); 1284 1285 if (fp != NULL) { 1286 char tmp[1024]; 1287 off_t atofs = 0; 1288 int length = strlen(name); 1289 1290 while (fgets(tmp, sizeof tmp, fp) != NULL) { 1291 if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') { 1292 if (fseek(fp, atofs, SEEK_SET) == 0) { 1293 fwrite("#", 1, 1, fp); /* Comment username out */ 1294 } 1295 break; 1296 } 1297 atofs = ftell(fp); 1298 } 1299 /* 1300 * If we got an error of any sort, don't update! 1301 */ 1302 fclose(fp); 1303 } 1304 } 1305 1306