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