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 3 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, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "includes.h"
  20 #include "system/passwd.h"
  21 #include "secrets.h"
  22 #include "../librpc/gen_ndr/samr.h"
  23 #include "../lib/util/util_pw.h"
  24 #include "passdb.h"
  25
  26 /*
  27  * Next two lines needed for SunOS and don't
  28  * hurt anything else...
  29  */
  30 extern char *optarg;
  31 extern int optind;
  32
  33 /* forced running in root-mode */
  34 static bool got_username = False;
  35 static bool stdin_passwd_get = False;
  36 static fstring user_name;
  37 static char *new_passwd = NULL;
  38 static const char *remote_machine = NULL;
  39
  40 static fstring ldap_secret;
  41
  42
  43 /*********************************************************
  44  Print command usage on stderr and die.
  45 **********************************************************/
  46 static void usage(void)
  47 {
  48         printf("When run by root:\n");
  49         printf("    smbpasswd [options] [username]\n");
  50         printf("otherwise:\n");
  51         printf("    smbpasswd [options]\n\n");
  52
  53         printf("options:\n");
  54         printf("  -L                   local mode (must be first option)\n");
  55         printf("  -h                   print this usage message\n");
  56         printf("  -s                   use stdin for password prompt\n");
  57         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  58         printf("  -D LEVEL             debug level\n");
  59         printf("  -r MACHINE           remote machine\n");
  60         printf("  -U USER              remote username\n");
  61
  62         printf("extra options when run by root or in local mode:\n");
  63         printf("  -a                   add user\n");
  64         printf("  -d                   disable user\n");
  65         printf("  -e                   enable user\n");
  66         printf("  -i                   interdomain trust account\n");
  67         printf("  -m                   machine trust account\n");
  68         printf("  -n                   set no password\n");
  69         printf("  -W                   use stdin ldap admin password\n");
  70         printf("  -w PASSWORD          ldap admin password\n");
  71         printf("  -x                   delete user\n");
  72         printf("  -R ORDER             name resolve order\n");
  73
  74         exit(1);
  75 }
  76
  77 static void set_line_buffering(FILE *f)
  78 {
  79         setvbuf(f, NULL, _IOLBF, 0);
  80 }
  81
  82 /*******************************************************************
  83  Process command line options
  84  ******************************************************************/
  85
  86 static int process_options(int argc, char **argv, int local_flags)
  87 {
  88         int ch;
  89         const char *configfile = get_dyn_CONFIGFILE();
  90
  91         local_flags |= LOCAL_SET_PASSWORD;
  92
  93         ZERO_STRUCT(user_name);
  94
  95         user_name[0] = '\0';
  96
  97         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LW")) != EOF) {
  98                 switch(ch) {
  99                 case 'L':
 100                         if (getuid() != 0) {
 101                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 102                                 exit(1);
 103                         }
 104                         local_flags |= LOCAL_AM_ROOT;
 105                         break;
 106                 case 'c':
 107                         configfile = optarg;
 108                         set_dyn_CONFIGFILE(optarg);
 109                         break;
 110                 case 'a':
 111                         local_flags |= LOCAL_ADD_USER;
 112                         break;
 113                 case 'x':
 114                         local_flags |= LOCAL_DELETE_USER;
 115                         local_flags &= ~LOCAL_SET_PASSWORD;
 116                         break;
 117                 case 'd':
 118                         local_flags |= LOCAL_DISABLE_USER;
 119                         local_flags &= ~LOCAL_SET_PASSWORD;
 120                         break;
 121                 case 'e':
 122                         local_flags |= LOCAL_ENABLE_USER;
 123                         local_flags &= ~LOCAL_SET_PASSWORD;
 124                         break;
 125                 case 'm':
 126                         local_flags |= LOCAL_TRUST_ACCOUNT;
 127                         break;
 128                 case 'i':
 129                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 130                         break;
 131                 case 'j':
 132                         d_printf("See 'net join' for this functionality\n");
 133                         exit(1);
 134                         break;
 135                 case 'n':
 136                         local_flags |= LOCAL_SET_NO_PASSWORD;
 137                         local_flags &= ~LOCAL_SET_PASSWORD;
 138                         SAFE_FREE(new_passwd);
 139                         new_passwd = smb_xstrdup("NO PASSWORD");
 140                         break;
 141                 case 'r':
 142                         remote_machine = optarg;
 143                         break;
 144                 case 's':
 145                         set_line_buffering(stdin);
 146                         set_line_buffering(stdout);
 147                         set_line_buffering(stderr);
 148                         stdin_passwd_get = True;
 149                         break;
 150                 case 'w':
 151                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 152                         fstrcpy(ldap_secret, optarg);
 153                         break;
 154                 case 'R':
 155                         lp_set_cmdline("name resolve order", optarg);
 156                         break;
 157                 case 'D':
 158                         lp_set_cmdline("log level", optarg);
 159                         break;
 160                 case 'U': {
 161                         got_username = True;
 162                         fstrcpy(user_name, optarg);
 163                         break;
 164                 case 'W':
 165                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 166                         *ldap_secret = '\0';
 167                         break;
 168                 }
 169                 case 'h':
 170                 default:
 171                         usage();
 172                 }
 173         }
 174
 175         argc -= optind;
 176         argv += optind;
 177
 178         switch(argc) {
 179         case 0:
 180                 if (!got_username)
 181                         fstrcpy(user_name, "");
 182                 break;
 183         case 1:
 184                 if (!(local_flags & LOCAL_AM_ROOT)) {
 185                         usage();
 186                 } else {
 187                         if (got_username) {
 188                                 usage();
 189                         } else {
 190                                 fstrcpy(user_name, argv[0]);
 191                         }
 192                 }
 193                 break;
 194         default:
 195                 usage();
 196         }
 197
 198         if (!lp_load_global(configfile)) {
 199                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 200                         configfile);
 201                 exit(1);
 202         }
 203
 204         return local_flags;
 205 }
 206
 207 /*************************************************************
 208  Utility function to prompt for new password.
 209 *************************************************************/
 210 static char *prompt_for_new_password(bool stdin_get)
 211 {
 212         char *p;
 213         fstring new_pw;
 214
 215         ZERO_ARRAY(new_pw);
 216
 217         p = get_pass("New SMB password:", stdin_get);
 218         if (p == NULL) {
 219                 return NULL;
 220         }
 221
 222         fstrcpy(new_pw, p);
 223         SAFE_FREE(p);
 224
 225         p = get_pass("Retype new SMB password:", stdin_get);
 226         if (p == NULL) {
 227                 return NULL;
 228         }
 229
 230         if (strcmp(p, new_pw)) {
 231                 fprintf(stderr, "Mismatch - password unchanged.\n");
 232                 ZERO_ARRAY(new_pw);
 233                 SAFE_FREE(p);
 234                 return NULL;
 235         }
 236
 237         return p;
 238 }
 239
 240
 241 /*************************************************************
 242  Change a password either locally or remotely.
 243 *************************************************************/
 244
 245 static NTSTATUS password_change(const char *remote_mach, char *username,
 246                                 char *old_passwd, char *new_pw,
 247                                 int local_flags)
 248 {
 249         NTSTATUS ret;
 250         char *err_str = NULL;
 251         char *msg_str = NULL;
 252
 253         if (remote_mach != NULL) {
 254                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
 255                                    LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 256                                    LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 257                         /* these things can't be done remotely yet */
 258                         fprintf(stderr, "Invalid remote operation!\n");
 259                         return NT_STATUS_UNSUCCESSFUL;
 260                 }
 261                 ret = remote_password_change(remote_mach, username,
 262                                              old_passwd, new_pw, &err_str);
 263         } else {
 264                 ret = local_password_change(username, local_flags, new_pw,
 265                                             &err_str, &msg_str);
 266         }
 267
 268         if (msg_str) {
 269                 printf("%s", msg_str);
 270         }
 271         if (err_str) {
 272                 fprintf(stderr, "%s", err_str);
 273         }
 274         if (!NT_STATUS_IS_OK(ret) && !err_str) {
 275                 fprintf(stderr, "Failed to change password!\n");
 276         }
 277
 278         SAFE_FREE(msg_str);
 279         SAFE_FREE(err_str);
 280         return ret;
 281 }
 282
 283 /*******************************************************************
 284  Store the LDAP admin password in secrets.tdb
 285  ******************************************************************/
 286 static bool store_ldap_admin_pw (char* pw)
 287 {
 288         if (!pw)
 289                 return False;
 290
 291         if (!secrets_init())
 292                 return False;
 293
 294         return secrets_store_ldap_pw(lp_ldap_admin_dn(talloc_tos()), pw);
 295 }
 296
 297
 298 /*************************************************************
 299  Handle password changing for root.
 300 *************************************************************/
 301
 302 static int process_root(int local_flags)
 303 {
 304         struct passwd  *pwd;
 305         int result = 0;
 306         char *old_passwd = NULL;
 307
 308         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 309                 char *ldap_admin_dn = lp_ldap_admin_dn(talloc_tos());
 310                 if ( ! *ldap_admin_dn ) {
 311                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 312                         goto done;
 313                 }
 314
 315                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 316                 if ( ! *ldap_secret ) {
 317                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 318                         if (new_passwd == NULL) {
 319                                 fprintf(stderr, "Failed to read new password!\n");
 320                                 exit(1);
 321                         }
 322                         fstrcpy(ldap_secret, new_passwd);
 323                 }
 324                 if (!store_ldap_admin_pw(ldap_secret)) {
 325                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 326                 }
 327                 goto done;
 328         }
 329
 330         /* Ensure passdb startup(). */
 331         if(!initialize_password_db(False, NULL)) {
 332                 DEBUG(0, ("Failed to open passdb!\n"));
 333                 exit(1);
 334         }
 335
 336         /* Ensure we have a SAM sid. */
 337         get_global_sam_sid();
 338
 339         /*
 340          * Ensure both add/delete user are not set
 341          * Ensure add/delete user and either remote machine or join domain are
 342          * not both set.
 343          */
 344         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 345            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 346                 (remote_machine != NULL))) {
 347                 usage();
 348         }
 349
 350         /* Only load interfaces if we are doing network operations. */
 351
 352         if (remote_machine) {
 353                 load_interfaces();
 354         }
 355
 356         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
 357                 fstrcpy(user_name, pwd->pw_name);
 358                 TALLOC_FREE(pwd);
 359         }
 360
 361         if (!user_name[0]) {
 362                 fprintf(stderr,"You must specify a username\n");
 363                 exit(1);
 364         }
 365
 366         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 367                 /* add the $ automatically */
 368                 static fstring buf;
 369
 370                 /*
 371                  * Remove any trailing '$' before we
 372                  * generate the initial machine password.
 373                  */
 374
 375                 if (user_name[strlen(user_name)-1] == '$') {
 376                         user_name[strlen(user_name)-1] = 0;
 377                 }
 378
 379                 if (local_flags & LOCAL_ADD_USER) {
 380                         SAFE_FREE(new_passwd);
 381                         new_passwd = smb_xstrdup(user_name);
 382                         if (!strlower_m(new_passwd)) {
 383                                 fprintf(stderr, "strlower_m %s failed\n",
 384                                         new_passwd);
 385                                 exit(1);
 386                         }
 387                 }
 388
 389                 /*
 390                  * Now ensure the username ends in '$' for
 391                  * the machine add.
 392                  */
 393
 394                 slprintf(buf, sizeof(buf)-1, "%s$", user_name);
 395                 strlcpy(user_name, buf, sizeof(user_name));
 396         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 397                 static fstring buf;
 398
 399                 if ((local_flags & LOCAL_ADD_USER) && (new_passwd == NULL)) {
 400                         /*
 401                          * Prompt for trusting domain's account password
 402                          */
 403                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 404                         if(!new_passwd) {
 405                                 fprintf(stderr, "Unable to get newpassword.\n");
 406                                 exit(1);
 407                         }
 408                 }
 409
 410                 /* prepare uppercased and '$' terminated username */
 411                 slprintf(buf, sizeof(buf) - 1, "%s$", user_name);
 412                 strlcpy(user_name, buf, sizeof(user_name));
 413
 414         } else {
 415
 416                 if (remote_machine != NULL) {
 417                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 418                         if(!old_passwd) {
 419                                 fprintf(stderr, "Unable to get old password.\n");
 420                                 exit(1);
 421                         }
 422                 }
 423
 424                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 425
 426                         /*
 427                          * If we are trying to enable a user, first we need to find out
 428                          * if they are using a modern version of the smbpasswd file that
 429                          * disables a user by just writing a flag into the file. If so
 430                          * then we can re-enable a user without prompting for a new
 431                          * password. If not (ie. they have a no stored password in the
 432                          * smbpasswd file) then we need to prompt for a new password.
 433                          */
 434
 435                         if(local_flags & LOCAL_ENABLE_USER) {
 436                                 struct samu *sampass = NULL;
 437
 438                                 sampass = samu_new( NULL );
 439                                 if (!sampass) {
 440                                         fprintf(stderr, "talloc fail for struct samu.\n");
 441                                         exit(1);
 442                                 }
 443                                 if (!pdb_getsampwnam(sampass, user_name)) {
 444                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 445                                                 user_name );
 446                                         exit(1);
 447                                 }
 448
 449                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 450                                         local_flags |= LOCAL_SET_PASSWORD;
 451                                 }
 452                                 TALLOC_FREE(sampass);
 453                         }
 454                 }
 455
 456                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 457
 458                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 459                         if(!new_passwd) {
 460                                 fprintf(stderr, "Unable to get new password.\n");
 461                                 exit(1);
 462                         }
 463                 }
 464         }
 465
 466         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name,
 467                                              old_passwd, new_passwd,
 468                                              local_flags))) {
 469                 result = 1;
 470                 goto done;
 471         }
 472
 473         if(remote_machine) {
 474                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 475         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 476                 struct samu *sampass = NULL;
 477
 478                 sampass = samu_new( NULL );
 479                 if (!sampass) {
 480                         fprintf(stderr, "talloc fail for struct samu.\n");
 481                         exit(1);
 482                 }
 483
 484                 if (!pdb_getsampwnam(sampass, user_name)) {
 485                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 486                                 user_name );
 487                         exit(1);
 488                 }
 489
 490                 printf("Password changed for user %s.", user_name );
 491                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 492                         printf(" User has disabled flag set.");
 493                 }
 494                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 495                         printf(" User has no password flag set.");
 496                 }
 497                 printf("\n");
 498                 TALLOC_FREE(sampass);
 499         }
 500
 501  done:
 502         SAFE_FREE(old_passwd);
 503         SAFE_FREE(new_passwd);
 504         return result;
 505 }
 506
 507
 508 /*************************************************************
 509  Handle password changing for non-root.
 510 *************************************************************/
 511
 512 static int process_nonroot(int local_flags)
 513 {
 514         struct passwd  *pwd = NULL;
 515         int result = 0;
 516         char *old_pw = NULL;
 517         char *new_pw = NULL;
 518
 519         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 520                 /* Extra flags that we can't honor non-root */
 521                 usage();
 522         }
 523
 524         if (!user_name[0]) {
 525                 pwd = getpwuid_alloc(talloc_tos(), getuid());
 526                 if (pwd) {
 527                         fstrcpy(user_name,pwd->pw_name);
 528                         TALLOC_FREE(pwd);
 529                 } else {
 530                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 531                         exit(1);
 532                 }
 533         }
 534
 535         /*
 536          * A non-root user is always setting a password
 537          * via a remote machine (even if that machine is
 538          * localhost).
 539          */
 540
 541         load_interfaces(); /* Delayed from main() */
 542
 543         if (remote_machine == NULL) {
 544                 remote_machine = "127.0.0.1";
 545         }
 546
 547         if (remote_machine != NULL) {
 548                 old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 549                 if (old_pw == NULL) {
 550                         fprintf(stderr, "Unable to get old password.\n");
 551                         exit(1);
 552                 }
 553         }
 554
 555         if (!new_passwd) {
 556                 new_pw = prompt_for_new_password(stdin_passwd_get);
 557         }
 558         else
 559                 new_pw = smb_xstrdup(new_passwd);
 560
 561         if (!new_pw) {
 562                 fprintf(stderr, "Unable to get new password.\n");
 563                 exit(1);
 564         }
 565
 566         if (!NT_STATUS_IS_OK(password_change(remote_machine, user_name, old_pw,
 567                                              new_pw, 0))) {
 568                 result = 1;
 569                 goto done;
 570         }
 571
 572         printf("Password changed for user %s\n", user_name);
 573
 574  done:
 575         SAFE_FREE(old_pw);
 576         SAFE_FREE(new_pw);
 577
 578         return result;
 579 }
 580
 581
 582
 583 /*********************************************************
 584  Start here.
 585 **********************************************************/
 586 int main(int argc, char **argv)
 587 {
 588         TALLOC_CTX *frame = talloc_stackframe();
 589         int local_flags = 0;
 590         int ret;
 591
 592 #if defined(HAVE_SET_AUTH_PARAMETERS)
 593         set_auth_parameters(argc, argv);
 594 #endif /* HAVE_SET_AUTH_PARAMETERS */
 595
 596         if (getuid() == 0) {
 597                 local_flags = LOCAL_AM_ROOT;
 598         }
 599
 600         smb_init_locale();
 601
 602         local_flags = process_options(argc, argv, local_flags);
 603
 604         setup_logging("smbpasswd", DEBUG_STDERR);
 605
 606         /*
 607          * Set the machine NETBIOS name if not already
 608          * set from the config file.
 609          */
 610
 611         if (!init_names())
 612                 return 1;
 613
 614         /* Check the effective uid - make sure we are not setuid */
 615         if (is_setuid_root()) {
 616                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 617                 exit(1);
 618         }
 619
 620         if (local_flags & LOCAL_AM_ROOT) {
 621                 bool ok;
 622
 623                 ok = secrets_init();
 624                 if (!ok) {
 625                         return 1;
 626                 }
 627                 ret = process_root(local_flags);
 628         } else {
 629                 ret = process_nonroot(local_flags);
 630         }
 631         TALLOC_FREE(frame);
 632         return ret;
 633 }