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