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