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 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_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 PASSWORD          ldap admin password\n");
  68         printf("  -x                   delete user\n");
  69         printf("  -R ORDER             name resolve order\n");
  70
  71         exit(1);
  72 }
  73
  74 static void set_line_buffering(FILE *f)
  75 {
  76         setvbuf(f, NULL, _IOLBF, 0);
  77 }
  78
  79 /*******************************************************************
  80  Process command line options
  81  ******************************************************************/
  82
  83 static int process_options(int argc, char **argv, int local_flags)
  84 {
  85         int ch;
  86         pstring configfile;
  87         pstrcpy(configfile, 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                         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                         got_username = True;
 154                         fstrcpy(user_name, optarg);
 155                         break;
 156                 case 'W':
 157                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 158                         *ldap_secret = '\0';
 159                         break;
 160                 }
 161                 case 'h':
 162                 default:
 163                         usage();
 164                 }
 165         }
 166
 167         argc -= optind;
 168         argv += optind;
 169
 170         switch(argc) {
 171         case 0:
 172                 if (!got_username)
 173                         fstrcpy(user_name, "");
 174                 break;
 175         case 1:
 176                 if (!(local_flags & LOCAL_AM_ROOT)) {
 177                         usage();
 178                 } else {
 179                         if (got_username) {
 180                                 usage();
 181                         } else {
 182                                 fstrcpy(user_name, argv[0]);
 183                         }
 184                 }
 185                 break;
 186         default:
 187                 usage();
 188         }
 189
 190         if (!lp_load(configfile,True,False,False,True)) {
 191                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 192                         dyn_CONFIGFILE);
 193                 exit(1);
 194         }
 195
 196         return local_flags;
 197 }
 198
 199 /*************************************************************
 200  Utility function to prompt for passwords from stdin. Each
 201  password entered must end with a newline.
 202 *************************************************************/
 203 static char *stdin_new_passwd(void)
 204 {
 205         static fstring new_pw;
 206         size_t len;
 207
 208         ZERO_ARRAY(new_pw);
 209
 210         /*
 211          * if no error is reported from fgets() and string at least contains
 212          * the newline that ends the password, then replace the newline with
 213          * a null terminator.
 214          */
 215         if ( fgets(new_pw, sizeof(new_pw), stdin) != NULL) {
 216                 if ((len = strlen(new_pw)) > 0) {
 217                         if(new_pw[len-1] == '\n')
 218                                 new_pw[len - 1] = 0;
 219                 }
 220         }
 221         return(new_pw);
 222 }
 223
 224
 225 /*************************************************************
 226  Utility function to get passwords via tty or stdin
 227  Used if the '-s' option is set to silently get passwords
 228  to enable scripting.
 229 *************************************************************/
 230 static char *get_pass( const char *prompt, BOOL stdin_get)
 231 {
 232         char *p;
 233         if (stdin_get) {
 234                 p = stdin_new_passwd();
 235         } else {
 236                 p = getpass(prompt);
 237         }
 238         return smb_xstrdup(p);
 239 }
 240
 241 /*************************************************************
 242  Utility function to prompt for new password.
 243 *************************************************************/
 244 static char *prompt_for_new_password(BOOL stdin_get)
 245 {
 246         char *p;
 247         fstring new_pw;
 248
 249         ZERO_ARRAY(new_pw);
 250
 251         p = get_pass("New SMB password:", stdin_get);
 252
 253         fstrcpy(new_pw, p);
 254         SAFE_FREE(p);
 255
 256         p = get_pass("Retype new SMB password:", stdin_get);
 257
 258         if (strcmp(p, new_pw)) {
 259                 fprintf(stderr, "Mismatch - password unchanged.\n");
 260                 ZERO_ARRAY(new_pw);
 261                 SAFE_FREE(p);
 262                 return NULL;
 263         }
 264
 265         return p;
 266 }
 267
 268
 269 /*************************************************************
 270  Change a password either locally or remotely.
 271 *************************************************************/
 272
 273 static BOOL password_change(const char *remote_mach, char *username,
 274                             char *old_passwd, char *new_pw, int local_flags)
 275 {
 276         BOOL ret;
 277         pstring err_str;
 278         pstring msg_str;
 279
 280         if (remote_mach != NULL) {
 281                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 282                                                         LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 283                         /* these things can't be done remotely yet */
 284                         return False;
 285                 }
 286                 ret = remote_password_change(remote_mach, username,
 287                                              old_passwd, new_pw, err_str, sizeof(err_str));
 288                 if(*err_str)
 289                         fprintf(stderr, "%s", err_str);
 290                 return ret;
 291         }
 292
 293         ret = local_password_change(username, local_flags, new_pw,
 294                                      err_str, sizeof(err_str), msg_str, sizeof(msg_str));
 295
 296         if(*msg_str)
 297                 printf("%s", msg_str);
 298         if(*err_str)
 299                 fprintf(stderr, "%s", err_str);
 300
 301         return ret;
 302 }
 303
 304 /*******************************************************************
 305  Store the LDAP admin password in secrets.tdb
 306  ******************************************************************/
 307 static BOOL store_ldap_admin_pw (char* pw)
 308 {
 309         if (!pw)
 310                 return False;
 311
 312         if (!secrets_init())
 313                 return False;
 314
 315         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 316 }
 317
 318
 319 /*************************************************************
 320  Handle password changing for root.
 321 *************************************************************/
 322
 323 static int process_root(int local_flags)
 324 {
 325         struct passwd  *pwd;
 326         int result = 0;
 327         char *old_passwd = NULL;
 328
 329         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 330                 char *ldap_admin_dn = lp_ldap_admin_dn();
 331                 if ( ! *ldap_admin_dn ) {
 332                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 333                         goto done;
 334                 }
 335
 336                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 337                 if ( ! *ldap_secret ) {
 338                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 339                         fstrcpy(ldap_secret, new_passwd);
 340                 }
 341                 if (!store_ldap_admin_pw(ldap_secret)) {
 342                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 343                 }
 344                 goto done;
 345         }
 346
 347         /* Ensure passdb startup(). */
 348         if(!initialize_password_db(False)) {
 349                 DEBUG(0, ("Failed to open passdb!\n"));
 350                 exit(1);
 351         }
 352
 353         /* Ensure we have a SAM sid. */
 354         get_global_sam_sid();
 355
 356         /*
 357          * Ensure both add/delete user are not set
 358          * Ensure add/delete user and either remote machine or join domain are
 359          * not both set.
 360          */
 361         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 362            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 363                 (remote_machine != NULL))) {
 364                 usage();
 365         }
 366
 367         /* Only load interfaces if we are doing network operations. */
 368
 369         if (remote_machine) {
 370                 load_interfaces();
 371         }
 372
 373         if (!user_name[0] && (pwd = getpwuid_alloc(geteuid()))) {
 374                 fstrcpy(user_name, pwd->pw_name);
 375                 passwd_free(&pwd);
 376         }
 377
 378         if (!user_name[0]) {
 379                 fprintf(stderr,"You must specify a username\n");
 380                 exit(1);
 381         }
 382
 383         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 384                 /* add the $ automatically */
 385                 static fstring buf;
 386
 387                 /*
 388                  * Remove any trailing '$' before we
 389                  * generate the initial machine password.
 390                  */
 391
 392                 if (user_name[strlen(user_name)-1] == '$') {
 393                         user_name[strlen(user_name)-1] = 0;
 394                 }
 395
 396                 if (local_flags & LOCAL_ADD_USER) {
 397                         SAFE_FREE(new_passwd);
 398                         new_passwd = smb_xstrdup(user_name);
 399                         strlower_m(new_passwd);
 400                 }
 401
 402                 /*
 403                  * Now ensure the username ends in '$' for
 404                  * the machine add.
 405                  */
 406
 407                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 408                 fstrcpy(user_name, buf);
 409         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 410                 static fstring buf;
 411
 412                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 413                         /*
 414                          * Prompt for trusting domain's account password
 415                          */
 416                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 417                         if(!new_passwd) {
 418                                 fprintf(stderr, "Unable to get newpassword.\n");
 419                                 exit(1);
 420                         }
 421                 }
 422
 423                 /* prepare uppercased and '$' terminated username */
 424                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 425                 fstrcpy(user_name, buf);
 426
 427         } else {
 428
 429                 if (remote_machine != NULL) {
 430                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 431                 }
 432
 433                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 434
 435                         /*
 436                          * If we are trying to enable a user, first we need to find out
 437                          * if they are using a modern version of the smbpasswd file that
 438                          * disables a user by just writing a flag into the file. If so
 439                          * then we can re-enable a user without prompting for a new
 440                          * password. If not (ie. they have a no stored password in the
 441                          * smbpasswd file) then we need to prompt for a new password.
 442                          */
 443
 444                         if(local_flags & LOCAL_ENABLE_USER) {
 445                                 SAM_ACCOUNT *sampass = NULL;
 446                                 BOOL ret;
 447
 448                                 pdb_init_sam(&sampass);
 449                                 ret = pdb_getsampwnam(sampass, user_name);
 450                                 if((ret) &&
 451                                    (pdb_get_lanman_passwd(sampass) == NULL)) {
 452                                         local_flags |= LOCAL_SET_PASSWORD;
 453                                 }
 454                                 pdb_free_sam(&sampass);
 455                         }
 456                 }
 457
 458                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 459                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 460
 461                         if(!new_passwd) {
 462                                 fprintf(stderr, "Unable to get new password.\n");
 463                                 exit(1);
 464                         }
 465                 }
 466         }
 467
 468         if (!password_change(remote_machine, user_name, old_passwd, new_passwd, local_flags)) {
 469                 fprintf(stderr,"Failed to modify password entry for user %s\n", user_name);
 470                 result = 1;
 471                 goto done;
 472         }
 473
 474         if(remote_machine) {
 475                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 476         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 477                 SAM_ACCOUNT *sampass = NULL;
 478                 BOOL ret;
 479
 480                 pdb_init_sam(&sampass);
 481                 ret = pdb_getsampwnam(sampass, user_name);
 482
 483                 printf("Password changed for user %s.", user_name );
 484                 if( (ret != False) && (pdb_get_acct_ctrl(sampass)&ACB_DISABLED) )
 485                         printf(" User has disabled flag set.");
 486                 if((ret != False) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) )
 487                         printf(" User has no password flag set.");
 488                 printf("\n");
 489                 pdb_free_sam(&sampass);
 490         }
 491
 492  done:
 493         SAFE_FREE(new_passwd);
 494         return result;
 495 }
 496
 497
 498 /*************************************************************
 499  Handle password changing for non-root.
 500 *************************************************************/
 501
 502 static int process_nonroot(int local_flags)
 503 {
 504         struct passwd  *pwd = NULL;
 505         int result = 0;
 506         char *old_pw = NULL;
 507         char *new_pw = NULL;
 508
 509         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 510                 /* Extra flags that we can't honor non-root */
 511                 usage();
 512         }
 513
 514         if (!user_name[0]) {
 515                 pwd = getpwuid_alloc(getuid());
 516                 if (pwd) {
 517                         fstrcpy(user_name,pwd->pw_name);
 518                         passwd_free(&pwd);
 519                 } else {
 520                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 521                         exit(1);
 522                 }
 523         }
 524
 525         /*
 526          * A non-root user is always setting a password
 527          * via a remote machine (even if that machine is
 528          * localhost).
 529          */
 530
 531         load_interfaces(); /* Delayed from main() */
 532
 533         if (remote_machine == NULL) {
 534                 remote_machine = "127.0.0.1";
 535         }
 536
 537         if (remote_machine != NULL) {
 538                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 539         }
 540
 541         if (!new_passwd) {
 542                 new_pw = prompt_for_new_password(stdin_passwd_get);
 543         }
 544         else
 545                 new_pw = smb_xstrdup(new_passwd);
 546
 547         if (!new_pw) {
 548                 fprintf(stderr, "Unable to get new password.\n");
 549                 exit(1);
 550         }
 551
 552         if (!password_change(remote_machine, user_name, old_pw, new_pw, 0)) {
 553                 fprintf(stderr,"Failed to change password for %s\n", user_name);
 554                 result = 1;
 555                 goto done;
 556         }
 557
 558         printf("Password changed for user %s\n", user_name);
 559
 560  done:
 561         SAFE_FREE(old_pw);
 562         SAFE_FREE(new_pw);
 563
 564         return result;
 565 }
 566
 567
 568
 569 /*********************************************************
 570  Start here.
 571 **********************************************************/
 572 int main(int argc, char **argv)
 573 {
 574         int local_flags = 0;
 575
 576         AllowDebugChange = False;
 577
 578 #if defined(HAVE_SET_AUTH_PARAMETERS)
 579         set_auth_parameters(argc, argv);
 580 #endif /* HAVE_SET_AUTH_PARAMETERS */
 581
 582         if (getuid() == 0) {
 583                 local_flags = LOCAL_AM_ROOT;
 584         }
 585
 586         load_case_tables();
 587
 588         local_flags = process_options(argc, argv, local_flags);
 589
 590         setup_logging("smbpasswd", True);
 591
 592         /*
 593          * Set the machine NETBIOS name if not already
 594          * set from the config file.
 595          */
 596
 597         if (!init_names())
 598                 return 1;
 599
 600         /* Check the effective uid - make sure we are not setuid */
 601         if (is_setuid_root()) {
 602                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 603                 exit(1);
 604         }
 605
 606         if (local_flags & LOCAL_AM_ROOT) {
 607                 secrets_init();
 608                 return process_root(local_flags);
 609         }
 610
 611         return process_nonroot(local_flags);
 612 }