source3/utils/smbpasswd.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Copyright (C) Jeremy Allison 1995-1998
   4  * Copyright (C) Tim Potter     2001
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 3 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "includes.h"
  20 #include "system/passwd.h"
  21 #include "secrets.h"
  22 #include "../librpc/gen_ndr/samr.h"
  23 #include "../lib/util/util_pw.h"
  24 #include "libsmb/proto.h"
  25 #include "passdb.h"
  26 #include "cmdline_contexts.h"
  27 #include "passwd_proto.h"
  28 #include "lib/util/string_wrappers.h"
  29 #include "lib/param/param.h"
  30 #include "lib/util/memcache.h"
  31
  32 /*
  33  * Next two lines needed for SunOS and don't
  34  * hurt anything else...
  35  */
  36 extern char *optarg;
  37 extern int optind;
  38
  39 /* forced running in root-mode */
  40 static bool got_username = False;
  41 static bool stdin_passwd_get = False;
  42 static fstring user_name;
  43 static char *new_passwd = NULL;
  44 static const char *remote_machine = NULL;
  45
  46 static fstring ldap_secret;
  47
  48
  49 /*********************************************************
  50  Print command usage on stderr and die.
  51 **********************************************************/
  52 static void usage(void)
  53 {
  54         printf("When run by root:\n");
  55         printf("    smbpasswd [options] [username]\n");
  56         printf("otherwise:\n");
  57         printf("    smbpasswd [options]\n\n");
  58
  59         printf("options:\n");
  60         printf("  -L                   local mode (must be first option)\n");
  61         printf("  -h                   print this usage message\n");
  62         printf("  -s                   use stdin for password prompt\n");
  63         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  64         printf("  -D LEVEL             debug level\n");
  65         printf("  -r MACHINE           remote machine\n");
  66         printf("  -U USER              remote username (e.g. SAM/user)\n");
  67
  68         printf("extra options when run by root or in local mode:\n");
  69         printf("  -a                   add user\n");
  70         printf("  -d                   disable user\n");
  71         printf("  -e                   enable user\n");
  72         printf("  -i                   interdomain trust account\n");
  73         printf("  -m                   machine trust account\n");
  74         printf("  -n                   set no password\n");
  75         printf("  -W                   use stdin ldap admin password\n");
  76         printf("  -w PASSWORD          ldap admin password\n");
  77         printf("  -x                   delete user\n");
  78         printf("  -R ORDER             name resolve order\n");
  79
  80         exit(1);
  81 }
  82
  83 static void set_line_buffering(FILE *f)
  84 {
  85         setvbuf(f, NULL, _IOLBF, 0);
  86 }
  87
  88 /*******************************************************************
  89  Process command line options
  90  ******************************************************************/
  91
  92 static int process_options(int argc, char **argv, int local_flags,
  93                            struct loadparm_context *lp_ctx)
  94 {
  95         int ch;
  96         const char *configfile = get_dyn_CONFIGFILE();
  97
  98         local_flags |= LOCAL_SET_PASSWORD;
  99
 100         ZERO_STRUCT(user_name);
 101
 102         user_name[0] = '\0';
 103
 104         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LWS:")) != EOF) {
 105                 switch(ch) {
 106                 case 'L':
 107                         if (getuid() != 0) {
 108                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 109                                 exit(1);
 110                         }
 111                         local_flags |= LOCAL_AM_ROOT;
 112                         break;
 113                 case 'c':
 114                         configfile = optarg;
 115                         set_dyn_CONFIGFILE(optarg);
 116                         break;
 117                 case 'a':
 118                         local_flags |= LOCAL_ADD_USER;
 119                         break;
 120                 case 'x':
 121                         local_flags |= LOCAL_DELETE_USER;
 122                         local_flags &= ~LOCAL_SET_PASSWORD;
 123                         break;
 124                 case 'd':
 125                         local_flags |= LOCAL_DISABLE_USER;
 126                         local_flags &= ~LOCAL_SET_PASSWORD;
 127                         break;
 128                 case 'e':
 129                         local_flags |= LOCAL_ENABLE_USER;
 130                         local_flags &= ~LOCAL_SET_PASSWORD;
 131                         break;
 132                 case 'm':
 133                         local_flags |= LOCAL_TRUST_ACCOUNT;
 134                         break;
 135                 case 'i':
 136                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 137                         break;
 138                 case 'j':
 139                         d_printf("See 'net join' for this functionality\n");
 140                         exit(1);
 141                         break;
 142                 case 'n':
 143                         local_flags |= LOCAL_SET_NO_PASSWORD;
 144                         local_flags &= ~LOCAL_SET_PASSWORD;
 145                         SAFE_FREE(new_passwd);
 146                         new_passwd = smb_xstrdup("NO PASSWORD");
 147                         break;
 148                 case 'r':
 149                         remote_machine = optarg;
 150                         break;
 151                 case 's':
 152                         set_line_buffering(stdin);
 153                         set_line_buffering(stdout);
 154                         set_line_buffering(stderr);
 155                         stdin_passwd_get = True;
 156                         break;
 157                 case 'w':
 158                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 159                         fstrcpy(ldap_secret, optarg);
 160                         break;
 161                 case 'R':
 162                         lpcfg_set_cmdline(lp_ctx, "name resolve order", optarg);
 163                         break;
 164                 case 'D':
 165                         lpcfg_set_cmdline(lp_ctx, "log level", optarg);
 166                         break;
 167                 case 'U': {
 168                         got_username = True;
 169                         fstrcpy(user_name, optarg);
 170                         break;
 171                 case 'W':
 172                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 173                         *ldap_secret = '\0';
 174                         break;
 175                 }
 176                 case 'h':
 177                 default:
 178                         usage();
 179                 }
 180         }
 181
 182         argc -= optind;
 183         argv += optind;
 184
 185         switch(argc) {
 186         case 0:
 187                 if (!got_username)
 188                         fstrcpy(user_name, "");
 189                 break;
 190         case 1:
 191                 if (!(local_flags & LOCAL_AM_ROOT)) {
 192                         usage();
 193                 } else {
 194                         if (got_username) {
 195                                 usage();
 196                         } else {
 197                                 fstrcpy(user_name, argv[0]);
 198                         }
 199                 }
 200                 break;
 201         default:
 202                 usage();
 203         }
 204
 205         if (!lp_load_global(configfile)) {
 206                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 207                         configfile);
 208                 exit(1);
 209         }
 210
 211         return local_flags;
 212 }
 213
 214 /*************************************************************
 215  Utility function to prompt for new password.
 216 *************************************************************/
 217 static char *prompt_for_new_password(bool stdin_get)
 218 {
 219         char *p;
 220         fstring new_pw;
 221
 222         ZERO_ARRAY(new_pw);
 223
 224         p = get_pass("New SMB password:", stdin_get);
 225         if (p == NULL) {
 226                 return NULL;
 227         }
 228
 229         fstrcpy(new_pw, p);
 230         SAFE_FREE(p);
 231
 232         p = get_pass("Retype new SMB password:", stdin_get);
 233         if (p == NULL) {
 234                 return NULL;
 235         }
 236
 237         if (strcmp(p, new_pw)) {
 238                 fprintf(stderr, "Mismatch - password unchanged.\n");
 239                 ZERO_ARRAY(new_pw);
 240                 SAFE_FREE(p);
 241                 return NULL;
 242         }
 243
 244         return p;
 245 }
 246
 247
 248 /*************************************************************
 249  Change a password either locally or remotely.
 250 *************************************************************/
 251
 252 static NTSTATUS password_change(const char *remote_mach,
 253                                 const char *domain, const char *username,
 254                                 const char *old_passwd, const char *new_pw,
 255                                 int local_flags)
 256 {
 257         NTSTATUS ret;
 258         char *err_str = NULL;
 259         char *msg_str = NULL;
 260
 261         if (remote_mach != NULL) {
 262                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
 263                                    LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 264                                    LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 265                         /* these things can't be done remotely yet */
 266                         fprintf(stderr, "Invalid remote operation!\n");
 267                         return NT_STATUS_UNSUCCESSFUL;
 268                 }
 269                 ret = remote_password_change(remote_mach,
 270                                              domain, username,
 271                                              old_passwd, new_pw, &err_str);
 272         } else {
 273                 ret = local_password_change(username, local_flags, new_pw,
 274                                             &err_str, &msg_str);
 275         }
 276
 277         if (msg_str) {
 278                 printf("%s", msg_str);
 279         }
 280         if (err_str) {
 281                 fprintf(stderr, "%s", err_str);
 282         }
 283         if (!NT_STATUS_IS_OK(ret) && !err_str) {
 284                 fprintf(stderr, "Failed to change password!\n");
 285         }
 286
 287         SAFE_FREE(msg_str);
 288         SAFE_FREE(err_str);
 289         return ret;
 290 }
 291
 292 /*******************************************************************
 293  Store the LDAP admin password in secrets.tdb
 294  ******************************************************************/
 295 static bool store_ldap_admin_pw (char* pw)
 296 {
 297         if (!pw)
 298                 return False;
 299
 300         if (!secrets_init())
 301                 return False;
 302
 303         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 304 }
 305
 306
 307 /*************************************************************
 308  Handle password changing for root.
 309 *************************************************************/
 310
 311 static int process_root(int local_flags)
 312 {
 313         struct passwd  *pwd;
 314         int result = 0;
 315         char *old_passwd = NULL;
 316
 317         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 318                 const char *ldap_admin_dn = lp_ldap_admin_dn();
 319                 if ( ! *ldap_admin_dn ) {
 320                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 321                         goto done;
 322                 }
 323
 324                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 325                 if ( ! *ldap_secret ) {
 326                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 327                         if (new_passwd == NULL) {
 328                                 fprintf(stderr, "Failed to read new password!\n");
 329                                 exit(1);
 330                         }
 331                         fstrcpy(ldap_secret, new_passwd);
 332                 }
 333                 if (!store_ldap_admin_pw(ldap_secret)) {
 334                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 335                 }
 336                 goto done;
 337         }
 338
 339         /* Ensure passdb startup(). */
 340         if(!initialize_password_db(False, NULL)) {
 341                 DEBUG(0, ("Failed to open passdb!\n"));
 342                 exit(1);
 343         }
 344
 345         /* Ensure we have a SAM sid. */
 346         get_global_sam_sid();
 347
 348         /*
 349          * Ensure both add/delete user are not set
 350          * Ensure add/delete user and either remote machine or join domain are
 351          * not both set.
 352          */
 353         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 354            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 355                 (remote_machine != NULL))) {
 356                 usage();
 357         }
 358
 359         /* Only load interfaces if we are doing network operations. */
 360
 361         if (remote_machine) {
 362                 load_interfaces();
 363         }
 364
 365         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
 366                 fstrcpy(user_name, pwd->pw_name);
 367                 TALLOC_FREE(pwd);
 368         }
 369
 370         if (!user_name[0]) {
 371                 fprintf(stderr,"You must specify a username\n");
 372                 exit(1);
 373         }
 374
 375         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 376                 /* add the $ automatically */
 377                 size_t user_name_len = strlen(user_name);
 378
 379                 if (user_name[user_name_len - 1] == '$') {
 380                         user_name_len--;
 381                 } else {
 382                         if (user_name_len + 2 > sizeof(user_name)) {
 383                                 fprintf(stderr, "machine name too long\n");
 384                                 exit(1);
 385                         }
 386                         user_name[user_name_len] = '$';
 387                         user_name[user_name_len + 1] = '\0';
 388                 }
 389
 390                 if (local_flags & LOCAL_ADD_USER) {
 391                         SAFE_FREE(new_passwd);
 392
 393                         /*
 394                          * Remove any trailing '$' before we
 395                          * generate the initial machine password.
 396                          */
 397                         new_passwd = smb_xstrndup(user_name, user_name_len);
 398                         if (!strlower_m(new_passwd)) {
 399                                 fprintf(stderr, "strlower_m %s failed\n",
 400                                         new_passwd);
 401                                 exit(1);
 402                         }
 403                 }
 404         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 405                 size_t user_name_len = strlen(user_name);
 406
 407                 if (user_name[user_name_len - 1] != '$') {
 408                         if (user_name_len + 2 > sizeof(user_name)) {
 409                                 fprintf(stderr, "machine name too long\n");
 410                                 exit(1);
 411                         }
 412                         user_name[user_name_len] = '$';
 413                         user_name[user_name_len + 1] = '\0';
 414                 }
 415
 416                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 417                         /*
 418                          * Prompt for trusting domain's account password
 419                          */
 420                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 421                         if(!new_passwd) {
 422                                 fprintf(stderr, "Unable to get newpassword.\n");
 423                                 exit(1);
 424                         }
 425                 }
 426         } else {
 427
 428                 if (remote_machine != NULL) {
 429                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 430                         if(!old_passwd) {
 431                                 fprintf(stderr, "Unable to get old password.\n");
 432                                 exit(1);
 433                         }
 434                 }
 435
 436                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 437
 438                         /*
 439                          * If we are trying to enable a user, first we need to find out
 440                          * if they are using a modern version of the smbpasswd file that
 441                          * disables a user by just writing a flag into the file. If so
 442                          * then we can re-enable a user without prompting for a new
 443                          * password. If not (ie. they have a no stored password in the
 444                          * smbpasswd file) then we need to prompt for a new password.
 445                          */
 446
 447                         if(local_flags & LOCAL_ENABLE_USER) {
 448                                 struct samu *sampass = NULL;
 449
 450                                 sampass = samu_new( NULL );
 451                                 if (!sampass) {
 452                                         fprintf(stderr, "talloc fail for struct samu.\n");
 453                                         exit(1);
 454                                 }
 455                                 if (!pdb_getsampwnam(sampass, user_name)) {
 456                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 457                                                 user_name );
 458                                         exit(1);
 459                                 }
 460
 461                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 462                                         local_flags |= LOCAL_SET_PASSWORD;
 463                                 }
 464                                 TALLOC_FREE(sampass);
 465                         }
 466                 }
 467
 468                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 469
 470                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 471                         if(!new_passwd) {
 472                                 fprintf(stderr, "Unable to get new password.\n");
 473                                 exit(1);
 474                         }
 475                 }
 476         }
 477
 478         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 479                                              NULL, user_name,
 480                                              old_passwd, new_passwd,
 481                                              local_flags))) {
 482                 result = 1;
 483                 goto done;
 484         }
 485
 486         if(remote_machine) {
 487                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 488         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 489                 struct samu *sampass = NULL;
 490
 491                 sampass = samu_new( NULL );
 492                 if (!sampass) {
 493                         fprintf(stderr, "talloc fail for struct samu.\n");
 494                         exit(1);
 495                 }
 496
 497                 if (!pdb_getsampwnam(sampass, user_name)) {
 498                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 499                                 user_name );
 500                         exit(1);
 501                 }
 502
 503                 printf("Password changed for user %s.", user_name );
 504                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 505                         printf(" User has disabled flag set.");
 506                 }
 507                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 508                         printf(" User has no password flag set.");
 509                 }
 510                 printf("\n");
 511                 TALLOC_FREE(sampass);
 512         }
 513
 514  done:
 515         SAFE_FREE(old_passwd);
 516         SAFE_FREE(new_passwd);
 517         return result;
 518 }
 519
 520
 521 /*************************************************************
 522  Handle password changing for non-root.
 523 *************************************************************/
 524
 525 static int process_nonroot(int local_flags)
 526 {
 527         struct passwd  *pwd = NULL;
 528         int result = 0;
 529         char *old_pw = NULL;
 530         char *new_pw = NULL;
 531         const char *username = user_name;
 532         const char *domain = NULL;
 533         char *p = NULL;
 534
 535         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 536                 /* Extra flags that we can't honor non-root */
 537                 usage();
 538         }
 539
 540         if (!user_name[0]) {
 541                 pwd = getpwuid_alloc(talloc_tos(), getuid());
 542                 if (pwd) {
 543                         fstrcpy(user_name,pwd->pw_name);
 544                         TALLOC_FREE(pwd);
 545                 } else {
 546                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 547                         exit(1);
 548                 }
 549         }
 550
 551         /* Allow domain as part of the username */
 552         if ((p = strchr_m(user_name, '\\')) ||
 553             (p = strchr_m(user_name, '/')) ||
 554             (p = strchr_m(user_name, *lp_winbind_separator()))) {
 555                 *p = '\0';
 556                 username = p + 1;
 557                 domain = user_name;
 558         }
 559
 560         /*
 561          * A non-root user is always setting a password
 562          * via a remote machine (even if that machine is
 563          * localhost).
 564          */
 565
 566         load_interfaces(); /* Delayed from main() */
 567
 568         if (remote_machine != NULL) {
 569                 if (!is_ipaddress(remote_machine)) {
 570                         domain = remote_machine;
 571                 }
 572         } else {
 573                 remote_machine = "127.0.0.1";
 574
 575                 /*
 576                  * If we deal with a local user, change the password for the
 577                  * user in our SAM.
 578                  */
 579                 domain = get_global_sam_name();
 580         }
 581
 582         old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 583         if (old_pw == NULL) {
 584                 fprintf(stderr, "Unable to get old password.\n");
 585                 exit(1);
 586         }
 587
 588         if (!new_passwd) {
 589                 new_pw = prompt_for_new_password(stdin_passwd_get);
 590         }
 591         else
 592                 new_pw = smb_xstrdup(new_passwd);
 593
 594         if (!new_pw) {
 595                 fprintf(stderr, "Unable to get new password.\n");
 596                 exit(1);
 597         }
 598
 599         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 600                                              domain, username,
 601                                              old_pw, new_pw, 0))) {
 602                 result = 1;
 603                 goto done;
 604         }
 605
 606         printf("Password changed for user %s\n", username);
 607
 608  done:
 609         SAFE_FREE(old_pw);
 610         SAFE_FREE(new_pw);
 611
 612         return result;
 613 }
 614
 615
 616
 617 /*********************************************************
 618  Start here.
 619 **********************************************************/
 620 int main(int argc, char **argv)
 621 {
 622         TALLOC_CTX *frame = talloc_stackframe();
 623         struct loadparm_context *lp_ctx = NULL;
 624         struct memcache *mcache = NULL;
 625         int local_flags = 0;
 626         int ret;
 627
 628         mcache = memcache_init(NULL, 0);
 629         if (mcache == NULL) {
 630                 fprintf(stderr, "%s: memcache_init failed\n", __location__);
 631                 return 1;
 632         }
 633         memcache_set_global(mcache);
 634
 635 #if defined(HAVE_SET_AUTH_PARAMETERS)
 636         set_auth_parameters(argc, argv);
 637 #endif /* HAVE_SET_AUTH_PARAMETERS */
 638
 639         if (getuid() == 0) {
 640                 local_flags = LOCAL_AM_ROOT;
 641         }
 642
 643         smb_init_locale();
 644
 645         lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
 646         if (lp_ctx == NULL) {
 647                 fprintf(stderr,
 648                         "Failed to initialise the global parameter structure.\n");
 649                 return 1;
 650         }
 651
 652         local_flags = process_options(argc, argv, local_flags, lp_ctx);
 653
 654         setup_logging("smbpasswd", DEBUG_STDERR);
 655
 656         /* Check the effective uid - make sure we are not setuid */
 657         if (is_setuid_root()) {
 658                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 659                 exit(1);
 660         }
 661
 662         if (local_flags & LOCAL_AM_ROOT) {
 663                 bool ok;
 664
 665                 ok = secrets_init();
 666                 if (!ok) {
 667                         return 1;
 668                 }
 669                 ret = process_root(local_flags);
 670         } else {
 671                 ret = process_nonroot(local_flags);
 672         }
 673
 674         gfree_all();
 675
 676         TALLOC_FREE(frame);
 677         return ret;
 678 }