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 "libsmb/proto.h"
  25 #include "passdb.h"
  26 #include "cmdline_contexts.h"
  27 #include "passwd_proto.h"
  28
  29 /*
  30  * Next two lines needed for SunOS and don't
  31  * hurt anything else...
  32  */
  33 extern char *optarg;
  34 extern int optind;
  35
  36 /* forced running in root-mode */
  37 static bool got_username = False;
  38 static bool stdin_passwd_get = False;
  39 static fstring user_name;
  40 static char *new_passwd = NULL;
  41 static const char *remote_machine = NULL;
  42
  43 static fstring ldap_secret;
  44
  45
  46 /*********************************************************
  47  Print command usage on stderr and die.
  48 **********************************************************/
  49 static void usage(void)
  50 {
  51         printf("When run by root:\n");
  52         printf("    smbpasswd [options] [username]\n");
  53         printf("otherwise:\n");
  54         printf("    smbpasswd [options]\n\n");
  55
  56         printf("options:\n");
  57         printf("  -L                   local mode (must be first option)\n");
  58         printf("  -h                   print this usage message\n");
  59         printf("  -s                   use stdin for password prompt\n");
  60         printf("  -c smb.conf file     Use the given path to the smb.conf file\n");
  61         printf("  -D LEVEL             debug level\n");
  62         printf("  -r MACHINE           remote machine\n");
  63         printf("  -U USER              remote username (e.g. SAM/user)\n");
  64
  65         printf("extra options when run by root or in local mode:\n");
  66         printf("  -a                   add user\n");
  67         printf("  -d                   disable user\n");
  68         printf("  -e                   enable user\n");
  69         printf("  -i                   interdomain trust account\n");
  70         printf("  -m                   machine trust account\n");
  71         printf("  -n                   set no password\n");
  72         printf("  -W                   use stdin ldap admin password\n");
  73         printf("  -w PASSWORD          ldap admin password\n");
  74         printf("  -x                   delete user\n");
  75         printf("  -R ORDER             name resolve order\n");
  76
  77         exit(1);
  78 }
  79
  80 static void set_line_buffering(FILE *f)
  81 {
  82         setvbuf(f, NULL, _IOLBF, 0);
  83 }
  84
  85 /*******************************************************************
  86  Process command line options
  87  ******************************************************************/
  88
  89 static int process_options(int argc, char **argv, int local_flags)
  90 {
  91         int ch;
  92         const char *configfile = get_dyn_CONFIGFILE();
  93
  94         local_flags |= LOCAL_SET_PASSWORD;
  95
  96         ZERO_STRUCT(user_name);
  97
  98         user_name[0] = '\0';
  99
 100         while ((ch = getopt(argc, argv, "c:axdehminjr:sw:R:D:U:LWS:")) != EOF) {
 101                 switch(ch) {
 102                 case 'L':
 103                         if (getuid() != 0) {
 104                                 fprintf(stderr, "smbpasswd -L can only be used by root.\n");
 105                                 exit(1);
 106                         }
 107                         local_flags |= LOCAL_AM_ROOT;
 108                         break;
 109                 case 'c':
 110                         configfile = optarg;
 111                         set_dyn_CONFIGFILE(optarg);
 112                         break;
 113                 case 'a':
 114                         local_flags |= LOCAL_ADD_USER;
 115                         break;
 116                 case 'x':
 117                         local_flags |= LOCAL_DELETE_USER;
 118                         local_flags &= ~LOCAL_SET_PASSWORD;
 119                         break;
 120                 case 'd':
 121                         local_flags |= LOCAL_DISABLE_USER;
 122                         local_flags &= ~LOCAL_SET_PASSWORD;
 123                         break;
 124                 case 'e':
 125                         local_flags |= LOCAL_ENABLE_USER;
 126                         local_flags &= ~LOCAL_SET_PASSWORD;
 127                         break;
 128                 case 'm':
 129                         local_flags |= LOCAL_TRUST_ACCOUNT;
 130                         break;
 131                 case 'i':
 132                         local_flags |= LOCAL_INTERDOM_ACCOUNT;
 133                         break;
 134                 case 'j':
 135                         d_printf("See 'net join' for this functionality\n");
 136                         exit(1);
 137                         break;
 138                 case 'n':
 139                         local_flags |= LOCAL_SET_NO_PASSWORD;
 140                         local_flags &= ~LOCAL_SET_PASSWORD;
 141                         SAFE_FREE(new_passwd);
 142                         new_passwd = smb_xstrdup("NO PASSWORD");
 143                         break;
 144                 case 'r':
 145                         remote_machine = optarg;
 146                         break;
 147                 case 's':
 148                         set_line_buffering(stdin);
 149                         set_line_buffering(stdout);
 150                         set_line_buffering(stderr);
 151                         stdin_passwd_get = True;
 152                         break;
 153                 case 'w':
 154                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 155                         fstrcpy(ldap_secret, optarg);
 156                         break;
 157                 case 'R':
 158                         lp_set_cmdline("name resolve order", optarg);
 159                         break;
 160                 case 'D':
 161                         lp_set_cmdline("log level", optarg);
 162                         break;
 163                 case 'U': {
 164                         got_username = True;
 165                         fstrcpy(user_name, optarg);
 166                         break;
 167                 case 'W':
 168                         local_flags |= LOCAL_SET_LDAP_ADMIN_PW;
 169                         *ldap_secret = '\0';
 170                         break;
 171                 }
 172                 case 'h':
 173                 default:
 174                         usage();
 175                 }
 176         }
 177
 178         argc -= optind;
 179         argv += optind;
 180
 181         switch(argc) {
 182         case 0:
 183                 if (!got_username)
 184                         fstrcpy(user_name, "");
 185                 break;
 186         case 1:
 187                 if (!(local_flags & LOCAL_AM_ROOT)) {
 188                         usage();
 189                 } else {
 190                         if (got_username) {
 191                                 usage();
 192                         } else {
 193                                 fstrcpy(user_name, argv[0]);
 194                         }
 195                 }
 196                 break;
 197         default:
 198                 usage();
 199         }
 200
 201         if (!lp_load_global(configfile)) {
 202                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 203                         configfile);
 204                 exit(1);
 205         }
 206
 207         return local_flags;
 208 }
 209
 210 /*************************************************************
 211  Utility function to prompt for new password.
 212 *************************************************************/
 213 static char *prompt_for_new_password(bool stdin_get)
 214 {
 215         char *p;
 216         fstring new_pw;
 217
 218         ZERO_ARRAY(new_pw);
 219
 220         p = get_pass("New SMB password:", stdin_get);
 221         if (p == NULL) {
 222                 return NULL;
 223         }
 224
 225         fstrcpy(new_pw, p);
 226         SAFE_FREE(p);
 227
 228         p = get_pass("Retype new SMB password:", stdin_get);
 229         if (p == NULL) {
 230                 return NULL;
 231         }
 232
 233         if (strcmp(p, new_pw)) {
 234                 fprintf(stderr, "Mismatch - password unchanged.\n");
 235                 ZERO_ARRAY(new_pw);
 236                 SAFE_FREE(p);
 237                 return NULL;
 238         }
 239
 240         return p;
 241 }
 242
 243
 244 /*************************************************************
 245  Change a password either locally or remotely.
 246 *************************************************************/
 247
 248 static NTSTATUS password_change(const char *remote_mach,
 249                                 const char *domain, const char *username,
 250                                 const char *old_passwd, const char *new_pw,
 251                                 int local_flags)
 252 {
 253         NTSTATUS ret;
 254         char *err_str = NULL;
 255         char *msg_str = NULL;
 256
 257         if (remote_mach != NULL) {
 258                 if (local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER|
 259                                    LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|
 260                                    LOCAL_TRUST_ACCOUNT|LOCAL_SET_NO_PASSWORD)) {
 261                         /* these things can't be done remotely yet */
 262                         fprintf(stderr, "Invalid remote operation!\n");
 263                         return NT_STATUS_UNSUCCESSFUL;
 264                 }
 265                 ret = remote_password_change(remote_mach,
 266                                              domain, username,
 267                                              old_passwd, new_pw, &err_str);
 268         } else {
 269                 ret = local_password_change(username, local_flags, new_pw,
 270                                             &err_str, &msg_str);
 271         }
 272
 273         if (msg_str) {
 274                 printf("%s", msg_str);
 275         }
 276         if (err_str) {
 277                 fprintf(stderr, "%s", err_str);
 278         }
 279         if (!NT_STATUS_IS_OK(ret) && !err_str) {
 280                 fprintf(stderr, "Failed to change password!\n");
 281         }
 282
 283         SAFE_FREE(msg_str);
 284         SAFE_FREE(err_str);
 285         return ret;
 286 }
 287
 288 /*******************************************************************
 289  Store the LDAP admin password in secrets.tdb
 290  ******************************************************************/
 291 static bool store_ldap_admin_pw (char* pw)
 292 {
 293         if (!pw)
 294                 return False;
 295
 296         if (!secrets_init())
 297                 return False;
 298
 299         return secrets_store_ldap_pw(lp_ldap_admin_dn(), pw);
 300 }
 301
 302
 303 /*************************************************************
 304  Handle password changing for root.
 305 *************************************************************/
 306
 307 static int process_root(int local_flags)
 308 {
 309         struct passwd  *pwd;
 310         int result = 0;
 311         char *old_passwd = NULL;
 312
 313         if (local_flags & LOCAL_SET_LDAP_ADMIN_PW) {
 314                 const char *ldap_admin_dn = lp_ldap_admin_dn();
 315                 if ( ! *ldap_admin_dn ) {
 316                         DEBUG(0,("ERROR: 'ldap admin dn' not defined! Please check your smb.conf\n"));
 317                         goto done;
 318                 }
 319
 320                 printf("Setting stored password for \"%s\" in secrets.tdb\n", ldap_admin_dn);
 321                 if ( ! *ldap_secret ) {
 322                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 323                         if (new_passwd == NULL) {
 324                                 fprintf(stderr, "Failed to read new password!\n");
 325                                 exit(1);
 326                         }
 327                         fstrcpy(ldap_secret, new_passwd);
 328                 }
 329                 if (!store_ldap_admin_pw(ldap_secret)) {
 330                         DEBUG(0,("ERROR: Failed to store the ldap admin password!\n"));
 331                 }
 332                 goto done;
 333         }
 334
 335         /* Ensure passdb startup(). */
 336         if(!initialize_password_db(False, NULL)) {
 337                 DEBUG(0, ("Failed to open passdb!\n"));
 338                 exit(1);
 339         }
 340
 341         /* Ensure we have a SAM sid. */
 342         get_global_sam_sid();
 343
 344         /*
 345          * Ensure both add/delete user are not set
 346          * Ensure add/delete user and either remote machine or join domain are
 347          * not both set.
 348          */
 349         if(((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) == (LOCAL_ADD_USER|LOCAL_DELETE_USER)) ||
 350            ((local_flags & (LOCAL_ADD_USER|LOCAL_DELETE_USER)) &&
 351                 (remote_machine != NULL))) {
 352                 usage();
 353         }
 354
 355         /* Only load interfaces if we are doing network operations. */
 356
 357         if (remote_machine) {
 358                 load_interfaces();
 359         }
 360
 361         if (!user_name[0] && (pwd = getpwuid_alloc(talloc_tos(), geteuid()))) {
 362                 fstrcpy(user_name, pwd->pw_name);
 363                 TALLOC_FREE(pwd);
 364         }
 365
 366         if (!user_name[0]) {
 367                 fprintf(stderr,"You must specify a username\n");
 368                 exit(1);
 369         }
 370
 371         if (local_flags & LOCAL_TRUST_ACCOUNT) {
 372                 /* add the $ automatically */
 373                 size_t user_name_len = strlen(user_name);
 374
 375                 if (user_name[user_name_len - 1] == '$') {
 376                         user_name_len--;
 377                 } else {
 378                         if (user_name_len + 2 > sizeof(user_name)) {
 379                                 fprintf(stderr, "machine name too long\n");
 380                                 exit(1);
 381                         }
 382                         user_name[user_name_len] = '$';
 383                         user_name[user_name_len + 1] = '\0';
 384                 }
 385
 386                 if (local_flags & LOCAL_ADD_USER) {
 387                         SAFE_FREE(new_passwd);
 388
 389                         /*
 390                          * Remove any trailing '$' before we
 391                          * generate the initial machine password.
 392                          */
 393                         new_passwd = smb_xstrndup(user_name, user_name_len);
 394                         if (!strlower_m(new_passwd)) {
 395                                 fprintf(stderr, "strlower_m %s failed\n",
 396                                         new_passwd);
 397                                 exit(1);
 398                         }
 399                 }
 400         } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
 401                 size_t user_name_len = strlen(user_name);
 402
 403                 if (user_name[user_name_len - 1] != '$') {
 404                         if (user_name_len + 2 > sizeof(user_name)) {
 405                                 fprintf(stderr, "machine name too long\n");
 406                                 exit(1);
 407                         }
 408                         user_name[user_name_len] = '$';
 409                         user_name[user_name_len + 1] = '\0';
 410                 }
 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         } else {
 423
 424                 if (remote_machine != NULL) {
 425                         old_passwd = get_pass("Old SMB password:",stdin_passwd_get);
 426                         if(!old_passwd) {
 427                                 fprintf(stderr, "Unable to get old password.\n");
 428                                 exit(1);
 429                         }
 430                 }
 431
 432                 if (!(local_flags & LOCAL_SET_PASSWORD)) {
 433
 434                         /*
 435                          * If we are trying to enable a user, first we need to find out
 436                          * if they are using a modern version of the smbpasswd file that
 437                          * disables a user by just writing a flag into the file. If so
 438                          * then we can re-enable a user without prompting for a new
 439                          * password. If not (ie. they have a no stored password in the
 440                          * smbpasswd file) then we need to prompt for a new password.
 441                          */
 442
 443                         if(local_flags & LOCAL_ENABLE_USER) {
 444                                 struct samu *sampass = NULL;
 445
 446                                 sampass = samu_new( NULL );
 447                                 if (!sampass) {
 448                                         fprintf(stderr, "talloc fail for struct samu.\n");
 449                                         exit(1);
 450                                 }
 451                                 if (!pdb_getsampwnam(sampass, user_name)) {
 452                                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 453                                                 user_name );
 454                                         exit(1);
 455                                 }
 456
 457                                 if(pdb_get_nt_passwd(sampass) == NULL) {
 458                                         local_flags |= LOCAL_SET_PASSWORD;
 459                                 }
 460                                 TALLOC_FREE(sampass);
 461                         }
 462                 }
 463
 464                 if((local_flags & LOCAL_SET_PASSWORD) && (new_passwd == NULL)) {
 465
 466                         new_passwd = prompt_for_new_password(stdin_passwd_get);
 467                         if(!new_passwd) {
 468                                 fprintf(stderr, "Unable to get new password.\n");
 469                                 exit(1);
 470                         }
 471                 }
 472         }
 473
 474         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 475                                              NULL, user_name,
 476                                              old_passwd, new_passwd,
 477                                              local_flags))) {
 478                 result = 1;
 479                 goto done;
 480         }
 481
 482         if(remote_machine) {
 483                 printf("Password changed for user %s on %s.\n", user_name, remote_machine );
 484         } else if(!(local_flags & (LOCAL_ADD_USER|LOCAL_DISABLE_USER|LOCAL_ENABLE_USER|LOCAL_DELETE_USER|LOCAL_SET_NO_PASSWORD|LOCAL_SET_PASSWORD))) {
 485                 struct samu *sampass = NULL;
 486
 487                 sampass = samu_new( NULL );
 488                 if (!sampass) {
 489                         fprintf(stderr, "talloc fail for struct samu.\n");
 490                         exit(1);
 491                 }
 492
 493                 if (!pdb_getsampwnam(sampass, user_name)) {
 494                         fprintf(stderr, "Failed to find user %s in passdb backend.\n",
 495                                 user_name );
 496                         exit(1);
 497                 }
 498
 499                 printf("Password changed for user %s.", user_name );
 500                 if(pdb_get_acct_ctrl(sampass)&ACB_DISABLED) {
 501                         printf(" User has disabled flag set.");
 502                 }
 503                 if(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) {
 504                         printf(" User has no password flag set.");
 505                 }
 506                 printf("\n");
 507                 TALLOC_FREE(sampass);
 508         }
 509
 510  done:
 511         SAFE_FREE(old_passwd);
 512         SAFE_FREE(new_passwd);
 513         return result;
 514 }
 515
 516
 517 /*************************************************************
 518  Handle password changing for non-root.
 519 *************************************************************/
 520
 521 static int process_nonroot(int local_flags)
 522 {
 523         struct passwd  *pwd = NULL;
 524         int result = 0;
 525         char *old_pw = NULL;
 526         char *new_pw = NULL;
 527         const char *username = user_name;
 528         const char *domain = NULL;
 529         char *p = NULL;
 530
 531         if (local_flags & ~(LOCAL_AM_ROOT | LOCAL_SET_PASSWORD)) {
 532                 /* Extra flags that we can't honor non-root */
 533                 usage();
 534         }
 535
 536         if (!user_name[0]) {
 537                 pwd = getpwuid_alloc(talloc_tos(), getuid());
 538                 if (pwd) {
 539                         fstrcpy(user_name,pwd->pw_name);
 540                         TALLOC_FREE(pwd);
 541                 } else {
 542                         fprintf(stderr, "smbpasswd: cannot lookup user name for uid %u\n", (unsigned int)getuid());
 543                         exit(1);
 544                 }
 545         }
 546
 547         /* Allow domain as part of the username */
 548         if ((p = strchr_m(user_name, '\\')) ||
 549             (p = strchr_m(user_name, '/')) ||
 550             (p = strchr_m(user_name, *lp_winbind_separator()))) {
 551                 *p = '\0';
 552                 username = p + 1;
 553                 domain = user_name;
 554         }
 555
 556         /*
 557          * A non-root user is always setting a password
 558          * via a remote machine (even if that machine is
 559          * localhost).
 560          */
 561
 562         load_interfaces(); /* Delayed from main() */
 563
 564         if (remote_machine != NULL) {
 565                 if (!is_ipaddress(remote_machine)) {
 566                         domain = remote_machine;
 567                 }
 568         } else {
 569                 remote_machine = "127.0.0.1";
 570
 571                 /*
 572                  * If we deal with a local user, change the password for the
 573                  * user in our SAM.
 574                  */
 575                 domain = get_global_sam_name();
 576         }
 577
 578         old_pw = get_pass("Old SMB password:",stdin_passwd_get);
 579         if (old_pw == NULL) {
 580                 fprintf(stderr, "Unable to get old password.\n");
 581                 exit(1);
 582         }
 583
 584         if (!new_passwd) {
 585                 new_pw = prompt_for_new_password(stdin_passwd_get);
 586         }
 587         else
 588                 new_pw = smb_xstrdup(new_passwd);
 589
 590         if (!new_pw) {
 591                 fprintf(stderr, "Unable to get new password.\n");
 592                 exit(1);
 593         }
 594
 595         if (!NT_STATUS_IS_OK(password_change(remote_machine,
 596                                              domain, username,
 597                                              old_pw, new_pw, 0))) {
 598                 result = 1;
 599                 goto done;
 600         }
 601
 602         printf("Password changed for user %s\n", username);
 603
 604  done:
 605         SAFE_FREE(old_pw);
 606         SAFE_FREE(new_pw);
 607
 608         return result;
 609 }
 610
 611
 612
 613 /*********************************************************
 614  Start here.
 615 **********************************************************/
 616 int main(int argc, char **argv)
 617 {
 618         TALLOC_CTX *frame = talloc_stackframe();
 619         int local_flags = 0;
 620         int ret;
 621
 622 #if defined(HAVE_SET_AUTH_PARAMETERS)
 623         set_auth_parameters(argc, argv);
 624 #endif /* HAVE_SET_AUTH_PARAMETERS */
 625
 626         if (getuid() == 0) {
 627                 local_flags = LOCAL_AM_ROOT;
 628         }
 629
 630         smb_init_locale();
 631
 632         local_flags = process_options(argc, argv, local_flags);
 633
 634         setup_logging("smbpasswd", DEBUG_STDERR);
 635
 636         /*
 637          * Set the machine NETBIOS name if not already
 638          * set from the config file.
 639          */
 640
 641         if (!init_names())
 642                 return 1;
 643
 644         /* Check the effective uid - make sure we are not setuid */
 645         if (is_setuid_root()) {
 646                 fprintf(stderr, "smbpasswd must *NOT* be setuid root.\n");
 647                 exit(1);
 648         }
 649
 650         if (local_flags & LOCAL_AM_ROOT) {
 651                 bool ok;
 652
 653                 ok = secrets_init();
 654                 if (!ok) {
 655                         return 1;
 656                 }
 657                 ret = process_root(local_flags);
 658         } else {
 659                 ret = process_nonroot(local_flags);
 660         }
 661         TALLOC_FREE(frame);
 662         return ret;
 663 }