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 "passdb.h"
  25
  26 /*
  27  * Next two lines needed for SunOS and don't
  28  * hurt anything else...
  29  */
  30 extern char *optarg;
  31 extern int optind;
  32
  33 /* forced running in root-mode */
  34 static bool got_username = False;
  35 static bool stdin_passwd_get = False;
  36 static fstring user_name;
  37 static char *new_passwd = NULL;
  38 static const char *remote_machine = NULL;
  39
  40 static fstring ldap_secret;
  41
  42
  43 /*********************************************************
  44  Print command usage on stderr and die.
  45 **********************************************************/
  46 static void usage(void)
  47 {
  48         printf("When run by root:\n");
  49         printf("    smbpasswd [options] [username]\n");
  50         printf("otherwise:\n");
  51         printf("    smbpasswd [options]\n\n");
  52
  53         printf("options:\n");
  54         printf("  -L                   local mode (must be first option)\n");
  55         printf("  -h                   print this usage message\n");
  56         printf("  -s                   use stdin for password prompt\n");
  57         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  58         printf("  -D LEVEL             debug level\n");
  59         printf("  -r MACHINE           remote machine\n");
  60         printf("  -U USER              remote username\n");
  61
  62         printf("extra options when run by root or in local mode:\n");
  63         printf("  -a                   add user\n");
  64         printf("  -d                   disable user\n");
  65         printf("  -e                   enable user\n");
  66         printf("  -i                   interdomain trust account\n");
  67         printf("  -m                   machine trust account\n");
  68         printf("  -n                   set no password\n");
  69         printf("  -W                   use stdin ldap admin password\n");
  70         printf("  -w PASSWORD          ldap admin password\n");
  71         printf("  -x                   delete user\n");
  72         printf("  -R ORDER             name resolve order\n");
  73
  74         exit(1);
  75 }
  76
  77 static void set_line_buffering(FILE *f)
  78 {
  79         setvbuf(f, NULL, _IOLBF, 0);
  80 }
  81
  82 /*******************************************************************
  83  Process command line options
  84  ******************************************************************/
  85
  86 static int process_options(int argc, char **argv, int local_flags)
  87 {
  88         int ch;
  89         const char *configfile = get_dyn_CONFIGFILE();
  90
  91         local_flags |= LOCAL_SET_PASSWORD;
  92
  93         ZERO_STRUCT(user_name);
  94
  95         user_name[0] = '\0';
  96
  97         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
  98                 switch(ch) {
  99                 case 'L':
 100 #if !defined(NSS_WRAPPER)
 101                         if (getuid() != 0) {
 102                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 103                                 exit(1);
 104                         }
 105 #endif
 106                         local_flags |= LOCAL_AM_ROOT;
 107                         break;
 108                 case 'c':
 109                         configfile = optarg;
 110                         set_dyn_CONFIGFILE(optarg);
 111                         break;
 112                 case 'a':
 113                         local_flags |= LOCAL_ADD_USER;
 114                         break;
 115                 case 'x':
 116                         local_flags |= LOCAL_DELETE_USER;
 117                         local_flags &= ~LOCAL_SET_PASSWORD;
 118                         break;
 119                 case 'd':
 120                         local_flags |= LOCAL_DISABLE_USER;
 121                         local_flags &= ~LOCAL_SET_PASSWORD;
 122                         break;
 123                 case 'e':
 124                         local_flags |= LOCAL_ENABLE_USER;
 125                         local_flags &= ~LOCAL_SET_PASSWORD;
 126                         break;
 127                 case 'm':
 128                         local_flags |= LOCAL_TRUST_ACCOUNT;
 129                         break;
 130                 case 'i':
 131                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 132                         break;
 133                 case 'j':
 134                         d_printf("See 'net join' for this functionality\n");
 135                         exit(1);
 136                         break;
 137                 case 'n':
 138                         local_flags |= LOCAL_SET_NO_PASSWORD;
 139                         local_flags &= ~LOCAL_SET_PASSWORD;
 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, char *username,
 247                                 char *old_passwd, char *new_pw,
 248                                 int local_flags)
 249 {
 250         NTSTATUS ret;
 251         char *err_str = NULL;
 252         char *msg_str = NULL;
 253
 254         if (remote_mach != NULL) {
 255                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
 256                                    LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 257                                    LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 258                         /* these things can't be done remotely yet */
 259                         fprintf(stderr, "Invalid remote operation!\n");
 260                         return NT_STATUS_UNSUCCESSFUL;
 261                 }
 262                 ret = remote_password_change(remote_mach, username,
 263                                              old_passwd, new_pw, &err_str);
 264         } else {
 265                 ret = local_password_change(username, local_flags, new_pw,
 266                                             &err_str, &msg_str);
 267         }
 268
 269         if (msg_str) {
 270                 printf("%s", msg_str);
 271         }
 272         if (err_str) {
 273                 fprintf(stderr, "%s", err_str);
 274         }
 275         if (!NT_STATUS_IS_OK(ret) && !err_str) {
 276                 fprintf(stderr, "Failed to change password!\n");
 277         }
 278
 279         SAFE_FREE(msg_str);
 280         SAFE_FREE(err_str);
 281         return ret;
 282 }
 283
 284 /*******************************************************************
 285  Store the LDAP admin password in secrets.tdb
 286  ******************************************************************/
 287 static bool store_ldap_admin_pw (char* pw)
 288 {
 289         if (!pw)
 290                 return False;
 291
 292         if (!secrets_init())
 293                 return False;
 294
 295         return secrets_store_ldap_pw(lp_ldap_admin_dn(talloc_tos()), pw);
 296 }
 297
 298
 299 /*************************************************************
 300  Handle password changing for root.
 301 *************************************************************/
 302
 303 static int process_root(int local_flags)
 304 {
 305         struct passwd  *pwd;
 306         int result = 0;
 307         char *old_passwd = NULL;
 308
 309         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 310                 char *ldap_admin_dn = lp_ldap_admin_dn(talloc_tos());
 311                 if ( ! *ldap_admin_dn ) {
 312                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 313                         goto done;
 314                 }
 315
 316                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 317                 if ( ! *ldap_secret ) {
 318                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 319                         if (new_passwd == NULL) {
 320                                 fprintf(stderr, "Failed to read new password!\n");
 321                                 exit(1);
 322                         }
 323                         fstrcpy(ldap_secret, new_passwd);
 324                 }
 325                 if (!store_ldap_admin_pw(ldap_secret)) {
 326                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 327                 }
 328                 goto done;
 329         }
 330
 331         /* Ensure passdb startup(). */
 332         if(!initialize_password_db(False, NULL)) {
 333                 DEBUG(0, ("Failed to open passdb!\n"));
 334                 exit(1);
 335         }
 336
 337         /* Ensure we have a SAM sid. */
 338         get_global_sam_sid();
 339
 340         /*
 341          * Ensure both add/delete user are not set
 342          * Ensure add/delete user and either remote machine or join domain are
 343          * not both set.
 344          */
 345         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 346            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 347                 (remote_machine != NULL))) {
 348                 usage();
 349         }
 350
 351         /* Only load interfaces if we are doing network operations. */
 352
 353         if (remote_machine) {
 354                 load_interfaces();
 355         }
 356
 357         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
 358                 fstrcpy(user_name, pwd->pw_name);
 359                 TALLOC_FREE(pwd);
 360         }
 361
 362         if (!user_name[0]) {
 363                 fprintf(stderr,"You must specify a username\n");
 364                 exit(1);
 365         }
 366
 367         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 368                 /* add the $ automatically */
 369                 static fstring buf;
 370
 371                 /*
 372                  * Remove any trailing '$' before we
 373                  * generate the initial machine password.
 374                  */
 375
 376                 if (user_name[strlen(user_name)-1] == '$') {
 377                         user_name[strlen(user_name)-1] = 0;
 378                 }
 379
 380                 if (local_flags & LOCAL_ADD_USER) {
 381                         SAFE_FREE(new_passwd);
 382                         new_passwd = smb_xstrdup(user_name);
 383                         if (!strlower_m(new_passwd)) {
 384                                 fprintf(stderr, "strlower_m %s failed\n",
 385                                         new_passwd);
 386                                 exit(1);
 387                         }
 388                 }
 389
 390                 /*
 391                  * Now ensure the username ends in '$' for
 392                  * the machine add.
 393                  */
 394
 395                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 396                 strlcpy(user_name, buf, sizeof(user_name));
 397         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 398                 static fstring buf;
 399
 400                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 401                         /*
 402                          * Prompt for trusting domain's account password
 403                          */
 404                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 405                         if(!new_passwd) {
 406                                 fprintf(stderr, "Unable to get newpassword.\n");
 407                                 exit(1);
 408                         }
 409                 }
 410
 411                 /* prepare uppercased and '$' terminated username */
 412                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 413                 strlcpy(user_name, buf, sizeof(user_name));
 414
 415         } else {
 416
 417                 if (remote_machine != NULL) {
 418                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 419                         if(!old_passwd) {
 420                                 fprintf(stderr, "Unable to get old password.\n");
 421                                 exit(1);
 422                         }
 423                 }
 424
 425                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 426
 427                         /*
 428                          * If we are trying to enable a user, first we need to find out
 429                          * if they are using a modern version of the smbpasswd file that
 430                          * disables a user by just writing a flag into the file. If so
 431                          * then we can re-enable a user without prompting for a new
 432                          * password. If not (ie. they have a no stored password in the
 433                          * smbpasswd file) then we need to prompt for a new password.
 434                          */
 435
 436                         if(local_flags & LOCAL_ENABLE_USER) {
 437                                 struct samu *sampass = NULL;
 438
 439                                 sampass = samu_new( NULL );
 440                                 if (!sampass) {
 441                                         fprintf(stderr, "talloc fail for struct samu.\n");
 442                                         exit(1);
 443                                 }
 444                                 if (!pdb_getsampwnam(sampass, user_name)) {
 445                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 446                                                 user_name );
 447                                         exit(1);
 448                                 }
 449
 450                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 451                                         local_flags |= LOCAL_SET_PASSWORD;
 452                                 }
 453                                 TALLOC_FREE(sampass);
 454                         }
 455                 }
 456
 457                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 458
 459                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 460                         if(!new_passwd) {
 461                                 fprintf(stderr, "Unable to get new password.\n");
 462                                 exit(1);
 463                         }
 464                 }
 465         }
 466
 467         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
 468                                              old_passwd, new_passwd,
 469                                              local_flags))) {
 470                 result = 1;
 471                 goto done;
 472         }
 473
 474         if(remote_machine) {
 475                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 476         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 477                 struct samu *sampass = NULL;
 478
 479                 sampass = samu_new( NULL );
 480                 if (!sampass) {
 481                         fprintf(stderr, "talloc fail for struct samu.\n");
 482                         exit(1);
 483                 }
 484
 485                 if (!pdb_getsampwnam(sampass, user_name)) {
 486                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 487                                 user_name );
 488                         exit(1);
 489                 }
 490
 491                 printf("Password changed for user %s.", user_name );
 492                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 493                         printf(" User has disabled flag set.");
 494                 }
 495                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 496                         printf(" User has no password flag set.");
 497                 }
 498                 printf("\n");
 499                 TALLOC_FREE(sampass);
 500         }
 501
 502  done:
 503         SAFE_FREE(old_passwd);
 504         SAFE_FREE(new_passwd);
 505         return result;
 506 }
 507
 508
 509 /*************************************************************
 510  Handle password changing for non-root.
 511 *************************************************************/
 512
 513 static int process_nonroot(int local_flags)
 514 {
 515         struct passwd  *pwd = NULL;
 516         int result = 0;
 517         char *old_pw = NULL;
 518         char *new_pw = NULL;
 519
 520         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 521                 /* Extra flags that we can't honor non-root */
 522                 usage();
 523         }
 524
 525         if (!user_name[0]) {
 526                 pwd = getpwuid_alloc(talloc_tos(), getuid());
 527                 if (pwd) {
 528                         fstrcpy(user_name,pwd->pw_name);
 529                         TALLOC_FREE(pwd);
 530                 } else {
 531                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 532                         exit(1);
 533                 }
 534         }
 535
 536         /*
 537          * A non-root user is always setting a password
 538          * via a remote machine (even if that machine is
 539          * localhost).
 540          */
 541
 542         load_interfaces(); /* Delayed from main() */
 543
 544         if (remote_machine == NULL) {
 545                 remote_machine = "127.0.0.1";
 546         }
 547
 548         if (remote_machine != NULL) {
 549                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 550                 if (old_pw == NULL) {
 551                         fprintf(stderr, "Unable to get old password.\n");
 552                         exit(1);
 553                 }
 554         }
 555
 556         if (!new_passwd) {
 557                 new_pw = prompt_for_new_password(stdin_passwd_get);
 558         }
 559         else
 560                 new_pw = smb_xstrdup(new_passwd);
 561
 562         if (!new_pw) {
 563                 fprintf(stderr, "Unable to get new password.\n");
 564                 exit(1);
 565         }
 566
 567         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
 568                                              new_pw, 0))) {
 569                 result = 1;
 570                 goto done;
 571         }
 572
 573         printf("Password changed for user %s\n", user_name);
 574
 575  done:
 576         SAFE_FREE(old_pw);
 577         SAFE_FREE(new_pw);
 578
 579         return result;
 580 }
 581
 582
 583
 584 /*********************************************************
 585  Start here.
 586 **********************************************************/
 587 int main(int argc, char **argv)
 588 {
 589         TALLOC_CTX *frame = talloc_stackframe();
 590         int local_flags = 0;
 591         int ret;
 592
 593 #if defined(HAVE_SET_AUTH_PARAMETERS)
 594         set_auth_parameters(argc, argv);
 595 #endif /* HAVE_SET_AUTH_PARAMETERS */
 596
 597         if (getuid() == 0) {
 598                 local_flags = LOCAL_AM_ROOT;
 599         }
 600
 601         load_case_tables();
 602
 603         local_flags = process_options(argc, argv, local_flags);
 604
 605         setup_logging("smbpasswd", DEBUG_STDERR);
 606
 607         /*
 608          * Set the machine NETBIOS name if not already
 609          * set from the config file.
 610          */
 611
 612         if (!init_names())
 613                 return 1;
 614
 615         /* Check the effective uid - make sure we are not setuid */
 616         if (is_setuid_root()) {
 617                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 618                 exit(1);
 619         }
 620
 621         if (local_flags & LOCAL_AM_ROOT) {
 622                 secrets_init();
 623                 ret = process_root(local_flags);
 624         } else {
 625                 ret = process_nonroot(local_flags);
 626         }
 627         TALLOC_FREE(frame);
 628         return ret;
 629 }