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 * $FreeBSD: src/usr.sbin/pw/pw_user.c,v 1.72 2012/02/22 06:27:20 kevlo Exp $ 27 */ 28 29 #include <ctype.h> 30 #include <err.h> 31 #include <fcntl.h> 32 #include <sys/param.h> 33 #include <dirent.h> 34 #include <paths.h> 35 #include <termios.h> 36 #include <sys/types.h> 37 #include <sys/time.h> 38 #include <sys/resource.h> 39 #include <unistd.h> 40 #include <login_cap.h> 41 #include "pw.h" 42 #include "bitmap.h" 43 44 #define LOGNAMESIZE (MAXLOGNAME-1) 45 46 static char locked_str[] = "*LOCKED*"; 47 48 static int print_user(struct passwd * pwd, int pretty, int v7); 49 static uid_t pw_uidpolicy(struct userconf * cnf, struct cargs * args); 50 static uid_t pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer); 51 static time_t pw_pwdpolicy(struct userconf * cnf, struct cargs * args); 52 static time_t pw_exppolicy(struct userconf * cnf, struct cargs * args); 53 static char *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user); 54 static char *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell); 55 static char *pw_password(struct userconf * cnf, struct cargs * args, char const * user); 56 static char *shell_path(char const * path, char *shells[], char *sh); 57 static void rmat(uid_t uid); 58 59 /*- 60 * -C config configuration file 61 * -q quiet operation 62 * -n name login name 63 * -u uid user id 64 * -c comment user name/comment 65 * -d directory home directory 66 * -e date account expiry date 67 * -p date password expiry date 68 * -g grp primary group 69 * -G grp1,grp2 additional groups 70 * -m [ -k dir ] create and set up home 71 * -s shell name of login shell 72 * -o duplicate uid ok 73 * -L class user class 74 * -l name new login name 75 * -h fd password filehandle 76 * -H fd encrypted password filehandle 77 * -F force print or add 78 * Setting defaults: 79 * -D set user defaults 80 * -b dir default home root dir 81 * -e period default expiry period 82 * -p period default password change period 83 * -g group default group 84 * -G grp1,grp2.. default additional groups 85 * -L class default login class 86 * -k dir default home skeleton 87 * -s shell default shell 88 * -w method default password method 89 */ 90 91 int 92 pw_user(struct userconf * cnf, int mode, struct cargs * args) 93 { 94 int rc, edited = 0; 95 char *p = NULL; 96 char *passtmp; 97 struct carg *a_name; 98 struct carg *a_uid; 99 struct carg *arg; 100 struct passwd *pwd = NULL; 101 struct group *grp; 102 struct stat st; 103 char line[_PASSWORD_LEN+1]; 104 FILE *fp; 105 char *dmode_c; 106 void *set = NULL; 107 108 static struct passwd fakeuser = 109 { 110 NULL, 111 "*", 112 -1, 113 -1, 114 0, 115 "", 116 "User &", 117 "/nonexistent", 118 "/bin/sh", 119 0 120 ,0 121 }; 122 123 124 /* 125 * With M_NEXT, we only need to return the 126 * next uid to stdout 127 */ 128 if (mode == M_NEXT) 129 { 130 uid_t next = pw_uidpolicy(cnf, args); 131 if (getarg(args, 'q')) 132 return next; 133 printf("%ld:", (long)next); 134 pw_group(cnf, mode, args); 135 return EXIT_SUCCESS; 136 } 137 138 /* 139 * We can do all of the common legwork here 140 */ 141 142 if ((arg = getarg(args, 'b')) != NULL) { 143 cnf->home = arg->val; 144 } 145 146 if ((arg = getarg(args, 'M')) != NULL) { 147 dmode_c = arg->val; 148 if ((set = setmode(dmode_c)) == NULL) 149 errx(EX_DATAERR, "invalid directory creation mode '%s'", 150 dmode_c); 151 cnf->homemode = getmode(set, _DEF_DIRMODE); 152 free(set); 153 } 154 155 /* 156 * If we'll need to use it or we're updating it, 157 * then create the base home directory if necessary 158 */ 159 if (arg != NULL || getarg(args, 'm') != NULL) { 160 int l = strlen(cnf->home); 161 162 if (l > 1 && cnf->home[l-1] == '/') /* Shave off any trailing path delimiter */ 163 cnf->home[--l] = '\0'; 164 165 if (l < 2 || *cnf->home != '/') /* Check for absolute path name */ 166 errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home); 167 168 if (stat(cnf->home, &st) == -1) { 169 char dbuf[MAXPATHLEN]; 170 171 /* 172 * This is a kludge especially for Joerg :) 173 * If the home directory would be created in the root partition, then 174 * we really create it under /usr which is likely to have more space. 175 * But we create a symlink from cnf->home -> "/usr" -> cnf->home 176 */ 177 if (strchr(cnf->home+1, '/') == NULL) { 178 strcpy(dbuf, "/usr"); 179 strncat(dbuf, cnf->home, MAXPATHLEN-5); 180 if (mkdir(dbuf, _DEF_DIRMODE) != -1 || errno == EEXIST) { 181 chown(dbuf, 0, 0); 182 /* 183 * Skip first "/" and create symlink: 184 * /home -> usr/home 185 */ 186 symlink(dbuf+1, cnf->home); 187 } 188 /* If this falls, fall back to old method */ 189 } 190 strlcpy(dbuf, cnf->home, sizeof(dbuf)); 191 p = dbuf; 192 if (stat(dbuf, &st) == -1) { 193 while ((p = strchr(++p, '/')) != NULL) { 194 *p = '\0'; 195 if (stat(dbuf, &st) == -1) { 196 if (mkdir(dbuf, _DEF_DIRMODE) == -1) 197 goto direrr; 198 chown(dbuf, 0, 0); 199 } else if (!S_ISDIR(st.st_mode)) 200 errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf); 201 *p = '/'; 202 } 203 } 204 if (stat(dbuf, &st) == -1) { 205 if (mkdir(dbuf, _DEF_DIRMODE) == -1) { 206 direrr: err(EX_OSFILE, "mkdir '%s'", dbuf); 207 } 208 chown(dbuf, 0, 0); 209 } 210 } else if (!S_ISDIR(st.st_mode)) 211 errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home); 212 } 213 214 if ((arg = getarg(args, 'e')) != NULL) 215 cnf->expire_days = atoi(arg->val); 216 217 if ((arg = getarg(args, 'y')) != NULL) 218 cnf->nispasswd = arg->val; 219 220 if ((arg = getarg(args, 'p')) != NULL && arg->val) 221 cnf->password_days = atoi(arg->val); 222 223 if ((arg = getarg(args, 'g')) != NULL) { 224 if (!*(p = arg->val)) /* Handle empty group list specially */ 225 cnf->default_group = ""; 226 else { 227 if ((grp = GETGRNAM(p)) == NULL) { 228 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL) 229 errx(EX_NOUSER, "group `%s' does not exist", p); 230 } 231 cnf->default_group = newstr(grp->gr_name); 232 } 233 } 234 if ((arg = getarg(args, 'L')) != NULL) 235 cnf->default_class = pw_checkname((u_char *)arg->val, 0); 236 237 if ((arg = getarg(args, 'G')) != NULL && arg->val) { 238 int i = 0; 239 240 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { 241 if ((grp = GETGRNAM(p)) == NULL) { 242 if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL) 243 errx(EX_NOUSER, "group `%s' does not exist", p); 244 } 245 if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1) 246 cnf->groups[i++] = newstr(grp->gr_name); 247 } 248 while (i < cnf->numgroups) 249 cnf->groups[i++] = NULL; 250 } 251 252 if ((arg = getarg(args, 'k')) != NULL) { 253 if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode)) 254 errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir); 255 } 256 257 if ((arg = getarg(args, 's')) != NULL) 258 cnf->shell_default = arg->val; 259 260 if ((arg = getarg(args, 'w')) != NULL) 261 cnf->default_password = boolean_val(arg->val, cnf->default_password); 262 if (mode == M_ADD && getarg(args, 'D')) { 263 if (getarg(args, 'n') != NULL) 264 errx(EX_DATAERR, "can't combine `-D' with `-n name'"); 265 if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) { 266 if ((cnf->min_uid = (uid_t) atoi(p)) == 0) 267 cnf->min_uid = 1000; 268 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid) 269 cnf->max_uid = 32000; 270 } 271 if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) { 272 if ((cnf->min_gid = (gid_t) atoi(p)) == 0) 273 cnf->min_gid = 1000; 274 if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid) 275 cnf->max_gid = 32000; 276 } 277 278 arg = getarg(args, 'C'); 279 if (write_userconfig(arg ? arg->val : NULL)) 280 return EXIT_SUCCESS; 281 warn("config update"); 282 return EX_IOERR; 283 } 284 285 if (mode == M_PRINT && getarg(args, 'a')) { 286 int pretty = getarg(args, 'P') != NULL; 287 int v7 = getarg(args, '7') != NULL; 288 289 SETPWENT(); 290 while ((pwd = GETPWENT()) != NULL) 291 print_user(pwd, pretty, v7); 292 ENDPWENT(); 293 return EXIT_SUCCESS; 294 } 295 296 if ((a_name = getarg(args, 'n')) != NULL) 297 pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0)); 298 a_uid = getarg(args, 'u'); 299 300 if (a_uid == NULL) { 301 if (a_name == NULL) 302 errx(EX_DATAERR, "user name or id required"); 303 304 /* 305 * Determine whether 'n' switch is name or uid - we don't 306 * really don't really care which we have, but we need to 307 * know. 308 */ 309 if (mode != M_ADD && pwd == NULL 310 && strspn(a_name->val, "0123456789") == strlen(a_name->val) 311 && atoi(a_name->val) > 0) { /* Assume uid */ 312 (a_uid = a_name)->ch = 'u'; 313 a_name = NULL; 314 } 315 } 316 317 /* 318 * Update, delete & print require that the user exists 319 */ 320 if (mode == M_UPDATE || mode == M_DELETE || 321 mode == M_PRINT || mode == M_LOCK || mode == M_UNLOCK) { 322 323 if (a_name == NULL && pwd == NULL) /* Try harder */ 324 pwd = GETPWUID(atoi(a_uid->val)); 325 326 if (pwd == NULL) { 327 if (mode == M_PRINT && getarg(args, 'F')) { 328 fakeuser.pw_name = a_name ? a_name->val : "nouser"; 329 fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1; 330 return print_user(&fakeuser, 331 getarg(args, 'P') != NULL, 332 getarg(args, '7') != NULL); 333 } 334 if (a_name == NULL) 335 errx(EX_NOUSER, "no such uid `%s'", a_uid->val); 336 errx(EX_NOUSER, "no such user `%s'", a_name->val); 337 } 338 339 if (a_name == NULL) /* May be needed later */ 340 a_name = addarg(args, 'n', newstr(pwd->pw_name)); 341 342 /* 343 * The M_LOCK and M_UNLOCK functions simply add or remove 344 * a "*LOCKED*" prefix from in front of the password to 345 * prevent it decoding correctly, and therefore prevents 346 * access. Of course, this only prevents access via 347 * password authentication (not ssh, kerberos or any 348 * other method that does not use the UNIX password) but 349 * that is a known limitation. 350 */ 351 352 if (mode == M_LOCK) { 353 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0) 354 errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name); 355 passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str)); 356 if (passtmp == NULL) /* disaster */ 357 errx(EX_UNAVAILABLE, "out of memory"); 358 strcpy(passtmp, locked_str); 359 strcat(passtmp, pwd->pw_passwd); 360 pwd->pw_passwd = passtmp; 361 edited = 1; 362 } else if (mode == M_UNLOCK) { 363 if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0) 364 errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name); 365 pwd->pw_passwd += sizeof(locked_str)-1; 366 edited = 1; 367 } else if (mode == M_DELETE) { 368 /* 369 * Handle deletions now 370 */ 371 char file[MAXPATHLEN]; 372 char home[MAXPATHLEN]; 373 uid_t uid = pwd->pw_uid; 374 375 if (strcmp(pwd->pw_name, "root") == 0) 376 errx(EX_DATAERR, "cannot remove user 'root'"); 377 378 if (!PWALTDIR()) { 379 /* 380 * Remove crontabs 381 */ 382 sprintf(file, "/var/cron/tabs/%s", pwd->pw_name); 383 if (access(file, F_OK) == 0) { 384 sprintf(file, "crontab -u %s -r", pwd->pw_name); 385 system(file); 386 } 387 } 388 /* 389 * Save these for later, since contents of pwd may be 390 * invalidated by deletion 391 */ 392 sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name); 393 strlcpy(home, pwd->pw_dir, sizeof(home)); 394 395 rc = delpwent(pwd); 396 if (rc == -1) 397 err(EX_IOERR, "user '%s' does not exist", pwd->pw_name); 398 else if (rc != 0) { 399 warn("passwd update"); 400 return EX_IOERR; 401 } 402 403 if (cnf->nispasswd && *cnf->nispasswd=='/') { 404 rc = delnispwent(cnf->nispasswd, a_name->val); 405 if (rc == -1) 406 warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name); 407 else if (rc != 0) 408 warn("WARNING: NIS passwd update"); 409 /* non-fatal */ 410 } 411 412 editgroups(a_name->val, NULL); 413 414 pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid); 415 416 if (!PWALTDIR()) { 417 /* 418 * Remove mail file 419 */ 420 remove(file); 421 422 /* 423 * Remove at jobs 424 */ 425 if (getpwuid(uid) == NULL) 426 rmat(uid); 427 428 /* 429 * Remove home directory and contents 430 */ 431 if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) { 432 if (stat(home, &st) != -1) { 433 rm_r(home, uid); 434 pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved", 435 a_name->val, (long) uid, home, 436 stat(home, &st) == -1 ? "" : "not completely "); 437 } 438 } 439 } 440 return EXIT_SUCCESS; 441 } else if (mode == M_PRINT) 442 return print_user(pwd, 443 getarg(args, 'P') != NULL, 444 getarg(args, '7') != NULL); 445 446 /* 447 * The rest is edit code 448 */ 449 if ((arg = getarg(args, 'l')) != NULL) { 450 if (strcmp(pwd->pw_name, "root") == 0) 451 errx(EX_DATAERR, "can't rename `root' account"); 452 pwd->pw_name = pw_checkname((u_char *)arg->val, 0); 453 edited = 1; 454 } 455 456 if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) { 457 pwd->pw_uid = (uid_t) atol(arg->val); 458 edited = 1; 459 if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0) 460 errx(EX_DATAERR, "can't change uid of `root' account"); 461 if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0) 462 warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name); 463 } 464 465 if ((arg = getarg(args, 'g')) != NULL) { /* Already checked this */ 466 if (strcmp(pwd->pw_name, "root") == 0) 467 errx(EX_DATAERR, "can't change gid of `root' account"); 468 gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid; 469 if (newgid != pwd->pw_gid) { 470 edited = 1; 471 pwd->pw_gid = newgid; 472 } 473 } 474 475 if ((arg = getarg(args, 'p')) != NULL) { 476 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 477 if (pwd->pw_change != 0) { 478 pwd->pw_change = 0; 479 edited = 1; 480 } 481 } 482 else { 483 time_t now = time(NULL); 484 time_t expire = parse_date(now, arg->val); 485 486 if (now == expire) 487 errx(EX_DATAERR, "invalid password change date `%s'", arg->val); 488 if (pwd->pw_change != expire) { 489 pwd->pw_change = expire; 490 edited = 1; 491 } 492 } 493 } 494 495 if ((arg = getarg(args, 'e')) != NULL) { 496 if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) { 497 if (pwd->pw_expire != 0) { 498 pwd->pw_expire = 0; 499 edited = 1; 500 } 501 } 502 else { 503 time_t now = time(NULL); 504 time_t expire = parse_date(now, arg->val); 505 506 if (now == expire) 507 errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val); 508 if (pwd->pw_expire != expire) { 509 pwd->pw_expire = expire; 510 edited = 1; 511 } 512 } 513 } 514 515 if ((arg = getarg(args, 's')) != NULL) { 516 char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val); 517 if (shell == NULL) 518 shell = ""; 519 if (strcmp(shell, pwd->pw_shell) != 0) { 520 pwd->pw_shell = shell; 521 edited = 1; 522 } 523 } 524 525 if (getarg(args, 'L')) { 526 if (cnf->default_class == NULL) 527 cnf->default_class = ""; 528 if (strcmp(pwd->pw_class, cnf->default_class) != 0) { 529 pwd->pw_class = cnf->default_class; 530 edited = 1; 531 } 532 } 533 534 if ((arg = getarg(args, 'd')) != NULL) { 535 if (strcmp(pwd->pw_dir, arg->val)) 536 edited = 1; 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 && 545 getarg(args, 'h') == 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 (arg = getarg(args, 'H')) != NULL) { 605 if (strcmp(arg->val, "-") == 0) { 606 if (!pwd->pw_passwd || *pwd->pw_passwd != '*') { 607 pwd->pw_passwd = "*"; /* No access */ 608 edited = 1; 609 } 610 } else { 611 int fd = atoi(arg->val); 612 int precrypt = (arg->ch == 'H'); 613 int b; 614 int istty = isatty(fd); 615 struct termios t; 616 login_cap_t *lc; 617 618 if (istty) { 619 if (tcgetattr(fd, &t) == -1) 620 istty = 0; 621 else { 622 struct termios n = t; 623 624 /* Disable echo */ 625 n.c_lflag &= ~(ECHO); 626 tcsetattr(fd, TCSANOW, &n); 627 printf("%s%spassword for user %s:", 628 (mode == M_UPDATE) ? "new " : "", 629 precrypt ? "encrypted " : "", 630 pwd->pw_name); 631 fflush(stdout); 632 } 633 } 634 b = read(fd, line, sizeof(line) - 1); 635 if (istty) { /* Restore state */ 636 tcsetattr(fd, TCSANOW, &t); 637 fputc('\n', stdout); 638 fflush(stdout); 639 } 640 if (b < 0) { 641 warn("-%c file descriptor", precrypt ? 'H' : 642 'h'); 643 return EX_IOERR; 644 } 645 line[b] = '\0'; 646 if ((p = strpbrk(line, "\r\n")) != NULL) 647 *p = '\0'; 648 if (!*line) 649 errx(EX_DATAERR, "empty password read on file descriptor %d", fd); 650 if (precrypt) { 651 if (strchr(line, ':') != NULL) 652 return EX_DATAERR; 653 pwd->pw_passwd = line; 654 } else { 655 lc = login_getpwclass(pwd); 656 if (lc == NULL || 657 login_setcryptfmt(lc, "md5", NULL) == NULL) 658 warn("setting crypt(3) format"); 659 login_close(lc); 660 pwd->pw_passwd = pw_pwcrypt(line); 661 } 662 edited = 1; 663 } 664 } 665 666 /* 667 * Special case: -N only displays & exits 668 */ 669 if (getarg(args, 'N') != NULL) 670 return print_user(pwd, 671 getarg(args, 'P') != NULL, 672 getarg(args, '7') != NULL); 673 674 if (mode == M_ADD) { 675 edited = 1; /* Always */ 676 rc = addpwent(pwd); 677 if (rc == -1) { 678 warnx("user '%s' already exists", pwd->pw_name); 679 return EX_IOERR; 680 } else if (rc != 0) { 681 warn("passwd file update"); 682 return EX_IOERR; 683 } 684 if (cnf->nispasswd && *cnf->nispasswd=='/') { 685 rc = addnispwent(cnf->nispasswd, pwd); 686 if (rc == -1) 687 warnx("User '%s' already exists in NIS passwd", pwd->pw_name); 688 else 689 warn("NIS passwd update"); 690 /* NOTE: we treat NIS-only update errors as non-fatal */ 691 } 692 } else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) { 693 if (edited) { /* Only updated this if required */ 694 rc = chgpwent(a_name->val, pwd); 695 if (rc == -1) { 696 warnx("user '%s' does not exist (NIS?)", pwd->pw_name); 697 return EX_IOERR; 698 } else if (rc != 0) { 699 warn("passwd file update"); 700 return EX_IOERR; 701 } 702 if ( cnf->nispasswd && *cnf->nispasswd=='/') { 703 rc = chgnispwent(cnf->nispasswd, a_name->val, pwd); 704 if (rc == -1) 705 warn("User '%s' not found in NIS passwd", pwd->pw_name); 706 else 707 warn("NIS passwd update"); 708 /* NOTE: NIS-only update errors are not fatal */ 709 } 710 } 711 } 712 713 /* 714 * Ok, user is created or changed - now edit group file 715 */ 716 717 if (mode == M_ADD || getarg(args, 'G') != NULL) 718 editgroups(pwd->pw_name, cnf->groups); 719 720 /* go get a current version of pwd */ 721 pwd = GETPWNAM(a_name->val); 722 if (pwd == NULL) { 723 /* This will fail when we rename, so special case that */ 724 if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) { 725 a_name->val = arg->val; /* update new name */ 726 pwd = GETPWNAM(a_name->val); /* refetch renamed rec */ 727 } 728 } 729 if (pwd == NULL) /* can't go on without this */ 730 errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val); 731 732 grp = GETGRGID(pwd->pw_gid); 733 pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s", 734 pwd->pw_name, (long) pwd->pw_uid, 735 grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1), 736 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell); 737 738 /* 739 * If adding, let's touch and chown the user's mail file. This is not 740 * strictly necessary under BSD with a 0755 maildir but it also 741 * doesn't hurt anything to create the empty mailfile 742 */ 743 if (mode == M_ADD) { 744 if (!PWALTDIR()) { 745 sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name); 746 close(open(line, O_RDWR | O_CREAT, 0600)); /* Preserve contents & 747 * mtime */ 748 chown(line, pwd->pw_uid, pwd->pw_gid); 749 } 750 } 751 752 /* 753 * Let's create and populate the user's home directory. Note 754 * that this also `works' for editing users if -m is used, but 755 * existing files will *not* be overwritten. 756 */ 757 if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) { 758 copymkdir(pwd->pw_dir, cnf->dotdir, cnf->homemode, pwd->pw_uid, pwd->pw_gid); 759 pw_log(cnf, mode, W_USER, "%s(%ld) home %s made", 760 pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir); 761 } 762 763 764 /* 765 * Finally, send mail to the new user as well, if we are asked to 766 */ 767 if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) { 768 FILE *pfp = popen(_PATH_SENDMAIL " -t", "w"); 769 770 if (pfp == NULL) 771 warn("sendmail"); 772 else { 773 fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name); 774 while (fgets(line, sizeof(line), fp) != NULL) { 775 /* Do substitutions? */ 776 fputs(line, pfp); 777 } 778 pclose(pfp); 779 pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent", 780 pwd->pw_name, (long) pwd->pw_uid); 781 } 782 fclose(fp); 783 } 784 785 return EXIT_SUCCESS; 786 } 787 788 789 static uid_t 790 pw_uidpolicy(struct userconf * cnf, struct cargs * args) 791 { 792 struct passwd *pwd; 793 uid_t uid = (uid_t) - 1; 794 struct carg *a_uid = getarg(args, 'u'); 795 796 /* 797 * Check the given uid, if any 798 */ 799 if (a_uid != NULL) { 800 uid = (uid_t) atol(a_uid->val); 801 802 if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL) 803 errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid); 804 } else { 805 struct bitmap bm; 806 807 /* 808 * We need to allocate the next available uid under one of 809 * two policies a) Grab the first unused uid b) Grab the 810 * highest possible unused uid 811 */ 812 if (cnf->min_uid >= cnf->max_uid) { /* Sanity 813 * claus^H^H^H^Hheck */ 814 cnf->min_uid = 1000; 815 cnf->max_uid = 32000; 816 } 817 bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1); 818 819 /* 820 * Now, let's fill the bitmap from the password file 821 */ 822 SETPWENT(); 823 while ((pwd = GETPWENT()) != NULL) 824 if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid) 825 bm_setbit(&bm, pwd->pw_uid - cnf->min_uid); 826 ENDPWENT(); 827 828 /* 829 * Then apply the policy, with fallback to reuse if necessary 830 */ 831 if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid) 832 uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid); 833 834 /* 835 * Another sanity check 836 */ 837 if (uid < cnf->min_uid || uid > cnf->max_uid) 838 errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used"); 839 bm_dealloc(&bm); 840 } 841 return uid; 842 } 843 844 845 static uid_t 846 pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer) 847 { 848 struct group *grp; 849 gid_t gid = (uid_t) - 1; 850 struct carg *a_gid = getarg(args, 'g'); 851 852 /* 853 * If no arg given, see if default can help out 854 */ 855 if (a_gid == NULL && cnf->default_group && *cnf->default_group) 856 a_gid = addarg(args, 'g', cnf->default_group); 857 858 /* 859 * Check the given gid, if any 860 */ 861 SETGRENT(); 862 if (a_gid != NULL) { 863 if ((grp = GETGRNAM(a_gid->val)) == NULL) { 864 gid = (gid_t) atol(a_gid->val); 865 if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL) 866 errx(EX_NOUSER, "group `%s' is not defined", a_gid->val); 867 } 868 gid = grp->gr_gid; 869 } else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) { 870 gid = grp->gr_gid; /* Already created? Use it anyway... */ 871 } else { 872 struct cargs grpargs; 873 char tmp[32]; 874 875 LIST_INIT(&grpargs); 876 addarg(&grpargs, 'n', nam); 877 878 /* 879 * We need to auto-create a group with the user's name. We 880 * can send all the appropriate output to our sister routine 881 * bit first see if we can create a group with gid==uid so we 882 * can keep the user and group ids in sync. We purposely do 883 * NOT check the gid range if we can force the sync. If the 884 * user's name dups an existing group, then the group add 885 * function will happily handle that case for us and exit. 886 */ 887 if (GETGRGID(prefer) == NULL) { 888 sprintf(tmp, "%lu", (unsigned long) prefer); 889 addarg(&grpargs, 'g', tmp); 890 } 891 if (getarg(args, 'N')) 892 { 893 addarg(&grpargs, 'N', NULL); 894 addarg(&grpargs, 'q', NULL); 895 gid = pw_group(cnf, M_NEXT, &grpargs); 896 } 897 else 898 { 899 pw_group(cnf, M_ADD, &grpargs); 900 if ((grp = GETGRNAM(nam)) != NULL) 901 gid = grp->gr_gid; 902 } 903 a_gid = LIST_FIRST(&grpargs); 904 while (a_gid != NULL) { 905 struct carg *t = LIST_NEXT(a_gid, list); 906 LIST_REMOVE(a_gid, list); 907 a_gid = t; 908 } 909 } 910 ENDGRENT(); 911 return gid; 912 } 913 914 915 static time_t 916 pw_pwdpolicy(struct userconf * cnf, struct cargs * args) 917 { 918 time_t result = 0; 919 time_t now = time(NULL); 920 struct carg *arg = getarg(args, 'p'); 921 922 if (arg != NULL) { 923 if ((result = parse_date(now, arg->val)) == now) 924 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 925 } else if (cnf->password_days > 0) 926 result = now + ((long) cnf->password_days * 86400L); 927 return result; 928 } 929 930 931 static time_t 932 pw_exppolicy(struct userconf * cnf, struct cargs * args) 933 { 934 time_t result = 0; 935 time_t now = time(NULL); 936 struct carg *arg = getarg(args, 'e'); 937 938 if (arg != NULL) { 939 if ((result = parse_date(now, arg->val)) == now) 940 errx(EX_DATAERR, "invalid date/time `%s'", arg->val); 941 } else if (cnf->expire_days > 0) 942 result = now + ((long) cnf->expire_days * 86400L); 943 return result; 944 } 945 946 947 static char * 948 pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user) 949 { 950 struct carg *arg = getarg(args, 'd'); 951 952 if (arg) 953 return arg->val; 954 else { 955 static char home[128]; 956 957 if (cnf->home == NULL || *cnf->home == '\0') 958 errx(EX_CONFIG, "no base home directory set"); 959 sprintf(home, "%s/%s", cnf->home, user); 960 return home; 961 } 962 } 963 964 static char * 965 shell_path(char const * path, char *shells[], char *sh) 966 { 967 if (sh != NULL && (*sh == '/' || *sh == '\0')) 968 return sh; /* specified full path or forced none */ 969 else { 970 char *p; 971 char paths[_UC_MAXLINE]; 972 973 /* 974 * We need to search paths 975 */ 976 strlcpy(paths, path, sizeof(paths)); 977 for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) { 978 int i; 979 static char shellpath[256]; 980 981 if (sh != NULL) { 982 sprintf(shellpath, "%s/%s", p, sh); 983 if (access(shellpath, X_OK) == 0) 984 return shellpath; 985 } else 986 for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) { 987 sprintf(shellpath, "%s/%s", p, shells[i]); 988 if (access(shellpath, X_OK) == 0) 989 return shellpath; 990 } 991 } 992 if (sh == NULL) 993 errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh); 994 errx(EX_CONFIG, "no default shell available or defined"); 995 return NULL; 996 } 997 } 998 999 1000 static char * 1001 pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell) 1002 { 1003 char *sh = newshell; 1004 struct carg *arg = getarg(args, 's'); 1005 1006 if (newshell == NULL && arg != NULL) 1007 sh = arg->val; 1008 return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default); 1009 } 1010 1011 #define SALTSIZE 32 1012 1013 static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./"; 1014 1015 char * 1016 pw_pwcrypt(char *password) 1017 { 1018 int i; 1019 char salt[SALTSIZE + 1]; 1020 char *cryptpw; 1021 1022 static char buf[256]; 1023 1024 /* 1025 * Calculate a salt value 1026 */ 1027 for (i = 0; i < SALTSIZE; i++) 1028 salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)]; 1029 salt[SALTSIZE] = '\0'; 1030 1031 cryptpw = crypt(password, salt); 1032 if (cryptpw == NULL) 1033 errx(EX_CONFIG, "crypt(3) failure"); 1034 return strcpy(buf, cryptpw); 1035 } 1036 1037 1038 static char * 1039 pw_password(struct userconf * cnf, struct cargs * args, char const * user) 1040 { 1041 int i, l; 1042 char pwbuf[32]; 1043 1044 switch (cnf->default_password) { 1045 case -1: /* Random password */ 1046 l = (arc4random() % 8 + 8); /* 8 - 16 chars */ 1047 for (i = 0; i < l; i++) 1048 pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)]; 1049 pwbuf[i] = '\0'; 1050 1051 /* 1052 * We give this information back to the user 1053 */ 1054 if (getarg(args, 'h') == NULL && getarg(args, 'H') == NULL && 1055 getarg(args, 'N') == NULL) { 1056 if (isatty(STDOUT_FILENO)) 1057 printf("Password for '%s' is: ", user); 1058 printf("%s\n", pwbuf); 1059 fflush(stdout); 1060 } 1061 break; 1062 1063 case -2: /* No password at all! */ 1064 return ""; 1065 1066 case 0: /* No login - default */ 1067 default: 1068 return "*"; 1069 1070 case 1: /* user's name */ 1071 strlcpy(pwbuf, user, sizeof(pwbuf)); 1072 break; 1073 } 1074 return pw_pwcrypt(pwbuf); 1075 } 1076 1077 1078 static int 1079 print_user(struct passwd * pwd, int pretty, int v7) 1080 { 1081 if (!pretty) { 1082 char buf[_UC_MAXLINE]; 1083 1084 fmtpwentry(buf, pwd, v7 ? PWF_PASSWD : PWF_STANDARD); 1085 fputs(buf, stdout); 1086 } else { 1087 int j; 1088 char *p; 1089 struct group *grp = GETGRGID(pwd->pw_gid); 1090 char uname[60] = "User &", office[60] = "[None]", 1091 wphone[60] = "[None]", hphone[60] = "[None]"; 1092 char acexpire[32] = "[None]", pwexpire[32] = "[None]"; 1093 struct tm * tptr; 1094 1095 if ((p = strtok(pwd->pw_gecos, ",")) != NULL) { 1096 strlcpy(uname, p, sizeof(uname)); 1097 if ((p = strtok(NULL, ",")) != NULL) { 1098 strlcpy(office, p, sizeof(office)); 1099 if ((p = strtok(NULL, ",")) != NULL) { 1100 strlcpy(wphone, p, sizeof(wphone)); 1101 if ((p = strtok(NULL, "")) != NULL) { 1102 strlcpy(hphone, p, 1103 sizeof(hphone)); 1104 } 1105 } 1106 } 1107 } 1108 /* 1109 * Handle '&' in gecos field 1110 */ 1111 if ((p = strchr(uname, '&')) != NULL) { 1112 int l = strlen(pwd->pw_name); 1113 int m = strlen(p); 1114 1115 memmove(p + l, p + 1, m); 1116 memmove(p, pwd->pw_name, l); 1117 *p = (char) toupper((unsigned char)*p); 1118 } 1119 if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL) 1120 strftime(acexpire, sizeof acexpire, "%c", tptr); 1121 if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL) 1122 strftime(pwexpire, sizeof pwexpire, "%c", tptr); 1123 printf("Login Name: %-15s #%-12ld Group: %-15s #%ld\n" 1124 " Full Name: %s\n" 1125 " Home: %-26.26s Class: %s\n" 1126 " Shell: %-26.26s Office: %s\n" 1127 "Work Phone: %-26.26s Home Phone: %s\n" 1128 "Acc Expire: %-26.26s Pwd Expire: %s\n", 1129 pwd->pw_name, (long) pwd->pw_uid, 1130 grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid, 1131 uname, pwd->pw_dir, pwd->pw_class, 1132 pwd->pw_shell, office, wphone, hphone, 1133 acexpire, pwexpire); 1134 SETGRENT(); 1135 j = 0; 1136 while ((grp=GETGRENT()) != NULL) 1137 { 1138 int i = 0; 1139 while (grp->gr_mem[i] != NULL) 1140 { 1141 if (strcmp(grp->gr_mem[i], pwd->pw_name)==0) 1142 { 1143 printf(j++ == 0 ? " Groups: %s" : ",%s", grp->gr_name); 1144 break; 1145 } 1146 ++i; 1147 } 1148 } 1149 ENDGRENT(); 1150 printf("%s", j ? "\n" : ""); 1151 } 1152 return EXIT_SUCCESS; 1153 } 1154 1155 char * 1156 pw_checkname(u_char *name, int gecos) 1157 { 1158 char showch[8]; 1159 u_char const *badchars, *ch, *showtype; 1160 int reject; 1161 1162 ch = name; 1163 reject = 0; 1164 if (gecos) { 1165 /* See if the name is valid as a gecos (comment) field. */ 1166 badchars = ":!@"; 1167 showtype = "gecos field"; 1168 } else { 1169 /* See if the name is valid as a userid or group. */ 1170 badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\""; 1171 showtype = "userid/group name"; 1172 /* Userids and groups can not have a leading '-'. */ 1173 if (*ch == '-') 1174 reject = 1; 1175 } 1176 if (!reject) { 1177 while (*ch) { 1178 if (strchr(badchars, *ch) != NULL || *ch < ' ' || 1179 *ch == 127) { 1180 reject = 1; 1181 break; 1182 } 1183 /* 8-bit characters are only allowed in GECOS fields */ 1184 if (!gecos && (*ch & 0x80)) { 1185 reject = 1; 1186 break; 1187 } 1188 ch++; 1189 } 1190 } 1191 /* 1192 * A `$' is allowed as the final character for userids and groups, 1193 * mainly for the benefit of samba. 1194 */ 1195 if (reject && !gecos) { 1196 if (*ch == '$' && *(ch + 1) == '\0') { 1197 reject = 0; 1198 ch++; 1199 } 1200 } 1201 if (reject) { 1202 snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127) 1203 ? "`%c'" : "0x%02x", *ch); 1204 errx(EX_DATAERR, "invalid character %s at position %td in %s", 1205 showch, (ch - name), showtype); 1206 } 1207 if (!gecos && (ch - name) > LOGNAMESIZE) 1208 errx(EX_DATAERR, "name too long `%s' (max is %d)", name, 1209 LOGNAMESIZE); 1210 return (char *)name; 1211 } 1212 1213 1214 static void 1215 rmat(uid_t uid) 1216 { 1217 DIR *d = opendir("/var/at/jobs"); 1218 1219 if (d != NULL) { 1220 struct dirent *e; 1221 1222 while ((e = readdir(d)) != NULL) { 1223 struct stat st; 1224 1225 if (strncmp(e->d_name, ".lock", 5) != 0 && 1226 stat(e->d_name, &st) == 0 && 1227 !S_ISDIR(st.st_mode) && 1228 st.st_uid == uid) { 1229 char tmp[MAXPATHLEN]; 1230 1231 sprintf(tmp, "/usr/bin/atrm %s", e->d_name); 1232 system(tmp); 1233 } 1234 } 1235 closedir(d); 1236 } 1237 } 1238