source3/utils/smbpasswd.c

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