source/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 2 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, write to the Free Software Foundation, Inc., 675
  18  * Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "includes.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_pass = False, got_username = False;
  33 static BOOL stdin_passwd_get = False;
  34 static fstring user_name, user_password;
  35 static char *new_passwd = NULL;
  36 static const char *remote_machine = NULL;
  37
  38 static fstring ldap_secret;
  39
  40 /*****************************************************************************
  41  stubb functions
  42 ****************************************************************************/
  43
  44 void become_root( void )
  45 {
  46         return;
  47 }
  48
  49 void unbecome_root( void )
  50 {
  51         return;
  52 }
  53
  54
  55 /*********************************************************
  56  Print command usage on stderr and die.
  57 **********************************************************/
  58 static void usage(void)
  59 {
  60         printf("When run by root:\n");
  61         printf("    smbpasswd [options] [username] [password]\n");
  62         printf("otherwise:\n");
  63         printf("    smbpasswd [options] [password]\n\n");
  64
  65         printf("options:\n");
  66         printf("  -L                   local mode (must be first option)\n");
  67         printf("  -h                   print this usage message\n");
  68         printf("  -s                   use stdin for password prompt\n");
  69         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  70         printf("  -D LEVEL             debug level\n");
  71         printf("  -r MACHINE           remote machine\n");
  72         printf("  -U USER              remote username\n");
  73
  74         printf("extra options when run by root or in local mode:\n");
  75         printf("  -a                   add user\n");
  76         printf("  -d                   disable user\n");
  77         printf("  -e                   enable user\n");
  78         printf("  -i                   interdomain trust account\n");
  79         printf("  -m                   machine trust account\n");
  80         printf("  -n                   set no password\n");
  81         printf("  -w                   ldap admin password\n");
  82         printf("  -x                   delete user\n");
  83         printf("  -R ORDER             name resolve order\n");
  84
  85         exit(1);
  86 }
  87
  88 static void set_line_buffering(FILE *f)
  89 {
  90         setvbuf(f, NULL, _IOLBF, 0);
  91 }
  92
  93 /*******************************************************************
  94  Process command line options
  95  ******************************************************************/
  96 static int process_options(int argc, char **argv, int local_flags)
  97 {
  98         int ch;
  99         pstring configfile;
 100         pstrcpy(configfile, dyn_CONFIGFILE);
 101
 102         local_flags |= LOCAL_SET_PASSWORD;
 103
 104         ZERO_STRUCT(user_name);
 105         ZERO_STRUCT(user_password);
 106
 107         user_name[0] = '\0';
 108
 109         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:L")) != EOF) {
 110                 switch(ch) {
 111                 case 'L':
 112                         local_flags |= LOCAL_AM_ROOT;
 113                         break;
 114                 case 'c':
 115                         pstrcpy(configfile,optarg);
 116                         break;
 117                 case 'a':
 118                         local_flags |= LOCAL_ADD_USER;
 119                         break;
 120                 case 'x':
 121                         local_flags |= LOCAL_DELETE_USER;
 122                         local_flags &= ~LOCAL_SET_PASSWORD;
 123                         break;
 124                 case 'd':
 125                         local_flags |= LOCAL_DISABLE_USER;
 126                         local_flags &= ~LOCAL_SET_PASSWORD;
 127                         break;
 128                 case 'e':
 129                         local_flags |= LOCAL_ENABLE_USER;
 130                         local_flags &= ~LOCAL_SET_PASSWORD;
 131                         break;
 132                 case 'm':
 133                         local_flags |= LOCAL_TRUST_ACCOUNT;
 134                         break;
 135                 case 'i':
 136                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 137                         break;
 138                 case 'j':
 139                         d_printf("See 'net join' for this functionality\n");
 140                         exit(1);
 141                         break;
 142                 case 'n':
 143                         local_flags |= LOCAL_SET_NO_PASSWORD;
 144                         local_flags &= ~LOCAL_SET_PASSWORD;
 145                         new_passwd = smb_xstrdup("NO PASSWORD");
 146                         break;
 147                 case 'r':
 148                         remote_machine = optarg;
 149                         break;
 150                 case 's':
 151                         set_line_buffering(stdin);
 152                         set_line_buffering(stdout);
 153                         set_line_buffering(stderr);
 154                         stdin_passwd_get = True;
 155                         break;
 156                 case 'w':
 157                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 158                         fstrcpy(ldap_secret, optarg);
 159                         break;
 160                 case 'R':
 161                         lp_set_name_resolve_order(optarg);
 162                         break;
 163                 case 'D':
 164                         DEBUGLEVEL = atoi(optarg);
 165                         break;
 166                 case 'U': {
 167                         char *lp;
 168
 169                         got_username = True;
 170                         fstrcpy(user_name, optarg);
 171
 172                         if ((lp = strchr(user_name, '%'))) {
 173                                 *lp = 0;
 174                                 fstrcpy(user_password, lp + 1);
 175                                 got_pass = True;
 176                                 memset(strchr_m(optarg, '%') + 1, 'X',
 177                                        strlen(user_password));
 178                         }
 179
 180                         break;
 181                 }
 182                 case 'h':
 183                 default:
 184                         usage();
 185                 }
 186         }
 187
 188         argc -= optind;
 189         argv += optind;
 190
 191         switch(argc) {
 192         case 0:
 193                 if (!got_username)
 194                         fstrcpy(user_name, "");
 195                 break;
 196         case 1:
 197                 if (!(local_flags & LOCAL_AM_ROOT)) {
 198                         new_passwd = argv[0];
 199                 } else {
 200                         if (got_username) {
 201                                 usage();
 202                         } else {
 203                                 fstrcpy(user_name, argv[0]);
 204                         }
 205                 }
 206                 break;
 207         case 2:
 208                 if (!(local_flags & LOCAL_AM_ROOT) || got_username || got_pass) {
 209                         usage();
 210                 }
 211
 212                 fstrcpy(user_name, argv[0]);
 213                 new_passwd = smb_xstrdup(argv[1]);
 214                 break;
 215         default:
 216                 usage();
 217         }
 218
 219         if (!lp_load(configfile,True,False,False)) {
 220                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 221                         dyn_CONFIGFILE);
 222                 exit(1);
 223         }
 224
 225         return local_flags;
 226 }
 227
 228 /*************************************************************
 229  Utility function to prompt for passwords from stdin. Each
 230  password entered must end with a newline.
 231 *************************************************************/
 232 static char *stdin_new_passwd(void)
 233 {
 234         static fstring new_pw;
 235         size_t len;
 236
 237         ZERO_ARRAY(new_pw);
 238
 239         /*
 240          * if no error is reported from fgets() and string at least contains
 241          * the newline that ends the password, then replace the newline with
 242          * a null terminator.
 243          */
 244         if ( fgets(new_pw, sizeof(new_pw), stdin) != NULL) {
 245                 if ((len = strlen(new_pw)) > 0) {
 246                         if(new_pw[len-1] == '\n')
 247                                 new_pw[len - 1] = 0;
 248                 }
 249         }
 250         return(new_pw);
 251 }
 252
 253
 254 /*************************************************************
 255  Utility function to get passwords via tty or stdin
 256  Used if the '-s' option is set to silently get passwords
 257  to enable scripting.
 258 *************************************************************/
 259 static char *get_pass( const char *prompt, BOOL stdin_get)
 260 {
 261         char *p;
 262         if (stdin_get) {
 263                 p = stdin_new_passwd();
 264         } else {
 265                 p = getpass(prompt);
 266         }
 267         return smb_xstrdup(p);
 268 }
 269
 270 /*************************************************************
 271  Utility function to prompt for new password.
 272 *************************************************************/
 273 static char *prompt_for_new_password(BOOL stdin_get)
 274 {
 275         char *p;
 276         fstring new_pw;
 277
 278         ZERO_ARRAY(new_pw);
 279
 280         p = get_pass("New SMB password:", stdin_get);
 281
 282         fstrcpy(new_pw, p);
 283         SAFE_FREE(p);
 284
 285         p = get_pass("Retype new SMB password:", stdin_get);
 286
 287         if (strcmp(p, new_pw)) {
 288                 fprintf(stderr, "Mismatch - password unchanged.\n");
 289                 ZERO_ARRAY(new_pw);
 290                 SAFE_FREE(p);
 291                 return NULL;
 292         }
 293
 294         return p;
 295 }
 296
 297
 298 /*************************************************************
 299  Change a password either locally or remotely.
 300 *************************************************************/
 301
 302 static BOOL password_change(const char *remote_mach, char *username,
 303                             char *old_passwd, char *new_pw, int local_flags)
 304 {
 305         BOOL ret;
 306         pstring err_str;
 307         pstring msg_str;
 308
 309         if (remote_mach != NULL) {
 310                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 311                                                         LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 312                         /* these things can't be done remotely yet */
 313                         return False;
 314                 }
 315                 ret = remote_password_change(remote_mach, username,
 316                                              old_passwd, new_pw, err_str, sizeof(err_str));
 317                 if(*err_str)
 318                         fprintf(stderr, err_str);
 319                 return ret;
 320         }
 321
 322         ret = local_password_change(username, local_flags, new_pw,
 323                                      err_str, sizeof(err_str), msg_str, sizeof(msg_str));
 324
 325         if(*msg_str)
 326                 printf(msg_str);
 327         if(*err_str)
 328                 fprintf(stderr, err_str);
 329
 330         return ret;
 331 }
 332
 333 /*******************************************************************
 334  Store the LDAP admin password in secrets.tdb
 335  ******************************************************************/
 336 static BOOL store_ldap_admin_pw (char* pw)
 337 {
 338         if (!pw)
 339                 return False;
 340
 341         if (!secrets_init())
 342                 return False;
 343
 344         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 345 }
 346
 347
 348 /*************************************************************
 349  Handle password changing for root.
 350 *************************************************************/
 351
 352 static int process_root(int local_flags)
 353 {
 354         struct passwd  *pwd;
 355         int result = 0;
 356         char *old_passwd = NULL;
 357
 358         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW)
 359         {
 360                 printf("Setting stored password for \"%s\" in secrets.tdb\n",
 361                         lp_ldap_admin_dn());
 362                 if (!store_ldap_admin_pw(ldap_secret))
 363                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 364                 goto done;
 365         }
 366
 367         /*
 368          * Ensure both add/delete user are not set
 369          * Ensure add/delete user and either remote machine or join domain are
 370          * not both set.
 371          */
 372         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 373            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 374                 (remote_machine != NULL))) {
 375                 usage();
 376         }
 377
 378         /* Only load interfaces if we are doing network operations. */
 379
 380         if (remote_machine) {
 381                 load_interfaces();
 382         }
 383
 384         if (!user_name[0] && (pwd = getpwuid_alloc(geteuid()))) {
 385                 fstrcpy(user_name, pwd->pw_name);
 386                 passwd_free(&pwd);
 387         }
 388
 389         if (!user_name[0]) {
 390                 fprintf(stderr,"You must specify a username\n");
 391                 exit(1);
 392         }
 393
 394         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 395                 /* add the $ automatically */
 396                 static fstring buf;
 397
 398                 /*
 399                  * Remove any trailing '$' before we
 400                  * generate the initial machine password.
 401                  */
 402
 403                 if (user_name[strlen(user_name)-1] == '$') {
 404                         user_name[strlen(user_name)-1] = 0;
 405                 }
 406
 407                 if (local_flags & LOCAL_ADD_USER) {
 408                         SAFE_FREE(new_passwd);
 409                         new_passwd = smb_xstrdup(user_name);
 410                         strlower_m(new_passwd);
 411                 }
 412
 413                 /*
 414                  * Now ensure the username ends in '$' for
 415                  * the machine add.
 416                  */
 417
 418                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 419                 fstrcpy(user_name, buf);
 420         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 421                 static fstring buf;
 422
 423                 if (local_flags & LOCAL_ADD_USER & !new_passwd) {
 424                         /*
 425                          * Prompt for trusting domain's account password
 426                          */
 427                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 428                         if(!new_passwd) {
 429                                 fprintf(stderr, "Unable to get newpassword.\n");
 430                                 exit(1);
 431                         }
 432                 }
 433
 434                 /* prepare uppercased and '$' terminated username */
 435                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 436                 fstrcpy(user_name, buf);
 437
 438         } else {
 439
 440                 if (remote_machine != NULL) {
 441                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 442                 }
 443
 444                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 445
 446                         /*
 447                          * If we are trying to enable a user, first we need to find out
 448                          * if they are using a modern version of the smbpasswd file that
 449                          * disables a user by just writing a flag into the file. If so
 450                          * then we can re-enable a user without prompting for a new
 451                          * password. If not (ie. they have a no stored password in the
 452                          * smbpasswd file) then we need to prompt for a new password.
 453                          */
 454
 455                         if(local_flags & LOCAL_ENABLE_USER) {
 456                                 SAM_ACCOUNT *sampass = NULL;
 457                                 BOOL ret;
 458
 459                                 pdb_init_sam(&sampass);
 460                                 ret = pdb_getsampwnam(sampass, user_name);
 461                                 if((sampass != False) && (pdb_get_lanman_passwd(sampass) == NULL)) {
 462                                         local_flags |= LOCAL_SET_PASSWORD;
 463                                 }
 464                                 pdb_free_sam(&sampass);
 465                         }
 466                 }
 467
 468                 if(local_flags & LOCAL_SET_PASSWORD & !new_passwd) {
 469                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 470
 471                         if(!new_passwd) {
 472                                 fprintf(stderr, "Unable to get new password.\n");
 473                                 exit(1);
 474                         }
 475                 }
 476         }
 477
 478         if (!password_change(remote_machine, user_name, old_passwd, new_passwd, local_flags)) {
 479                 fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
 480                 result = 1;
 481                 goto done;
 482         }
 483
 484         if(remote_machine) {
 485                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 486         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 487                 SAM_ACCOUNT *sampass = NULL;
 488                 BOOL ret;
 489
 490                 pdb_init_sam(&sampass);
 491                 ret = pdb_getsampwnam(sampass, user_name);
 492
 493                 printf("Password changed for user %s.", user_name );
 494                 if( (ret != False) && (pdb_get_acct_ctrl(sampass)&ACB_DISABLED) )
 495                         printf(" User has disabled flag set.");
 496                 if((ret != False) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) )
 497                         printf(" User has no password flag set.");
 498                 printf("\n");
 499                 pdb_free_sam(&sampass);
 500         }
 501
 502  done:
 503         SAFE_FREE(new_passwd);
 504         return result;
 505 }
 506
 507
 508 /*************************************************************
 509  Handle password changing for non-root.
 510 *************************************************************/
 511
 512 static int process_nonroot(int local_flags)
 513 {
 514         struct passwd  *pwd = NULL;
 515         int result = 0;
 516         char *old_pw = NULL;
 517         char *new_pw = NULL;
 518
 519         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 520                 /* Extra flags that we can't honor non-root */
 521                 usage();
 522         }
 523
 524         if (!user_name[0]) {
 525                 pwd = getpwuid_alloc(getuid());
 526                 if (pwd) {
 527                         fstrcpy(user_name,pwd->pw_name);
 528                         passwd_free(&pwd);
 529                 } else {
 530                         fprintf(stderr, "smbpasswd: you don't exist - go away\n");
 531                         exit(1);
 532                 }
 533         }
 534
 535         /*
 536          * A non-root user is always setting a password
 537          * via a remote machine (even if that machine is
 538          * localhost).
 539          */
 540
 541         load_interfaces(); /* Delayed from main() */
 542
 543         if (remote_machine == NULL) {
 544                 remote_machine = "127.0.0.1";
 545         }
 546
 547         if (remote_machine != NULL) {
 548                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 549         }
 550
 551         if (!new_passwd) {
 552                 new_pw = prompt_for_new_password(stdin_passwd_get);
 553         }
 554         else
 555                 new_pw = smb_xstrdup(new_passwd);
 556
 557         if (!new_pw) {
 558                 fprintf(stderr, "Unable to get new password.\n");
 559                 exit(1);
 560         }
 561
 562         if (!password_change(remote_machine, user_name, old_pw, new_pw, 0)) {
 563                 fprintf(stderr,"Failed to change password for %s\n", user_name);
 564                 result = 1;
 565                 goto done;
 566         }
 567
 568         printf("Password changed for user %s\n", user_name);
 569
 570  done:
 571         SAFE_FREE(old_pw);
 572         SAFE_FREE(new_pw);
 573
 574         return result;
 575 }
 576
 577
 578
 579 /*********************************************************
 580  Start here.
 581 **********************************************************/
 582 int main(int argc, char **argv)
 583 {
 584         int local_flags = 0;
 585
 586         AllowDebugChange = False;
 587
 588 #if defined(HAVE_SET_AUTH_PARAMETERS)
 589         set_auth_parameters(argc, argv);
 590 #endif /* HAVE_SET_AUTH_PARAMETERS */
 591
 592         if (getuid() == 0) {
 593                 local_flags = LOCAL_AM_ROOT;
 594         }
 595
 596         local_flags = process_options(argc, argv, local_flags);
 597
 598         setup_logging("smbpasswd", True);
 599
 600         /*
 601          * Set the machine NETBIOS name if not already
 602          * set from the config file.
 603          */
 604
 605         if (!init_names())
 606                 return 1;
 607
 608         /* Check the effective uid - make sure we are not setuid */
 609         if (is_setuid_root()) {
 610                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 611                 exit(1);
 612         }
 613
 614         if (local_flags & LOCAL_AM_ROOT) {
 615                 secrets_init();
 616                 return process_root(local_flags);
 617         }
 618
 619         return process_nonroot(local_flags);
 620 }