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