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