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