source3/libsmb/passchange.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client password change routine
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "../librpc/gen_ndr/ndr_samr.h"
  22 #include "rpc_client/cli_pipe.h"
  23 #include "rpc_client/cli_samr.h"
  24 #include "libsmb/libsmb.h"
  25 #include "libsmb/clirap.h"
  26 #include "libsmb/nmblib.h"
  27 #include "../libcli/smb/smbXcli_base.h"
  28
  29 /*************************************************************
  30  Change a password on a remote machine using IPC calls.
  31 *************************************************************/
  32
  33 NTSTATUS remote_password_change(const char *remote_machine,
  34                                 const char *domain, const char *user_name,
  35                                 const char *old_passwd, const char *new_passwd,
  36                                 char **err_str)
  37 {
  38         struct cli_state *cli = NULL;
  39         struct cli_credentials *creds = NULL;
  40         struct rpc_pipe_client *pipe_hnd = NULL;
  41         NTSTATUS status;
  42         NTSTATUS result;
  43         bool pass_must_change = False;
  44
  45         *err_str = NULL;
  46
  47         result = cli_connect_nb(talloc_tos(),
  48                                 remote_machine,
  49                                 NULL,
  50                                 0,
  51                                 0x20,
  52                                 NULL,
  53                                 SMB_SIGNING_IPC_DEFAULT,
  54                                 0,
  55                                 &cli);
  56         if (!NT_STATUS_IS_OK(result)) {
  57                 if (NT_STATUS_EQUAL(result, NT_STATUS_NOT_SUPPORTED)) {
  58                         if (asprintf(err_str, "Unable to connect to SMB server on "
  59                                 "machine %s. NetBIOS support disabled\n",
  60                                 remote_machine) == -1) {
  61                                 *err_str = NULL;
  62                         }
  63                 } else {
  64                         if (asprintf(err_str, "Unable to connect to SMB server on "
  65                                  "machine %s. Error was : %s.\n",
  66                                  remote_machine, nt_errstr(result))==-1) {
  67                                 *err_str = NULL;
  68                         }
  69                 }
  70                 return result;
  71         }
  72
  73         creds = cli_session_creds_init(cli,
  74                                        user_name,
  75                                        domain,
  76                                        NULL, /* realm */
  77                                        old_passwd,
  78                                        false, /* use_kerberos */
  79                                        false, /* fallback_after_kerberos */
  80                                        false, /* use_ccache */
  81                                        false); /* password_is_nt_hash */
  82         SMB_ASSERT(creds != NULL);
  83
  84         result = smbXcli_negprot(cli->conn,
  85                                  cli->timeout,
  86                                  lp_client_ipc_min_protocol(),
  87                                  lp_client_ipc_max_protocol(),
  88                                  NULL,
  89                                  NULL,
  90                                  NULL);
  91
  92         if (!NT_STATUS_IS_OK(result)) {
  93                 if (asprintf(err_str, "machine %s rejected the negotiate "
  94                          "protocol. Error was : %s.\n",
  95                          remote_machine, nt_errstr(result)) == -1) {
  96                         *err_str = NULL;
  97                 }
  98                 cli_shutdown(cli);
  99                 return result;
 100         }
 101
 102         /* Given things like SMB signing, restrict anonymous and the like,
 103            try an authenticated connection first */
 104         result = cli_session_setup_creds(cli, creds);
 105
 106         if (!NT_STATUS_IS_OK(result)) {
 107
 108                 /* Password must change or Password expired are the only valid
 109                  * error conditions here from where we can proceed, the rest like
 110                  * account locked out or logon failure will lead to errors later
 111                  * anyway */
 112
 113                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 114                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 115                         if (asprintf(err_str, "Could not connect to machine %s: "
 116                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
 117                                 *err_str = NULL;
 118                         }
 119                         cli_shutdown(cli);
 120                         return result;
 121                 }
 122
 123                 pass_must_change = True;
 124
 125                 /*
 126                  * We should connect as the anonymous user here, in case
 127                  * the server has "must change password" checked...
 128                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 129                  */
 130
 131                 result = cli_session_setup_anon(cli);
 132
 133                 if (!NT_STATUS_IS_OK(result)) {
 134                         if (asprintf(err_str, "machine %s rejected the session "
 135                                  "setup. Error was : %s.\n",
 136                                  remote_machine, nt_errstr(result)) == -1) {
 137                                 *err_str = NULL;
 138                         }
 139                         cli_shutdown(cli);
 140                         return result;
 141                 }
 142         }
 143
 144         result = cli_tree_connect(cli, "IPC$", "IPC", NULL);
 145         if (!NT_STATUS_IS_OK(result)) {
 146                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 147                              "IPC$ share. Error was : %s.\n",
 148                              remote_machine, nt_errstr(result))) {
 149                         *err_str = NULL;
 150                 }
 151                 cli_shutdown(cli);
 152                 return result;
 153         }
 154
 155         /* Try not to give the password away too easily */
 156
 157         if (!pass_must_change) {
 158                 const struct sockaddr_storage *remote_sockaddr =
 159                         smbXcli_conn_remote_sockaddr(cli->conn);
 160
 161                 result = cli_rpc_pipe_open_with_creds(cli,
 162                                                       &ndr_table_samr,
 163                                                       NCACN_NP,
 164                                                       DCERPC_AUTH_TYPE_NTLMSSP,
 165                                                       DCERPC_AUTH_LEVEL_PRIVACY,
 166                                                       remote_machine,
 167                                                       remote_sockaddr,
 168                                                       creds,
 169                                                       &pipe_hnd);
 170         } else {
 171                 /*
 172                  * If the user password must be changed the ntlmssp bind will
 173                  * fail the same way as the session setup above did. The
 174                  * difference is that with a pipe bind we don't get a good
 175                  * error message, the result will be that the rpc call below
 176                  * will just fail. So we do it anonymously, there's no other
 177                  * way.
 178                  */
 179                 result = cli_rpc_pipe_open_noauth(
 180                         cli, &ndr_table_samr, &pipe_hnd);
 181         }
 182
 183         if (!NT_STATUS_IS_OK(result)) {
 184                 if (lp_client_lanman_auth()) {
 185                         /* Use the old RAP method. */
 186                         result = cli_oem_change_password(cli,
 187                                                          user_name,
 188                                                          new_passwd,
 189                                                          old_passwd);
 190                         if (!NT_STATUS_IS_OK(result)) {
 191                                 if (asprintf(err_str, "machine %s rejected the "
 192                                          "password change: Error was : %s.\n",
 193                                          remote_machine, nt_errstr(result)) == -1) {
 194                                         *err_str = NULL;
 195                                 }
 196                                 cli_shutdown(cli);
 197                                 return result;
 198                         }
 199                 } else {
 200                         if (asprintf(err_str, "SAMR connection to machine %s "
 201                                  "failed. Error was %s, but LANMAN password "
 202                                  "changes are disabled\n",
 203                                  remote_machine, nt_errstr(result)) == -1) {
 204                                 *err_str = NULL;
 205                         }
 206                         cli_shutdown(cli);
 207                         return result;
 208                 }
 209         }
 210
 211         status = dcerpc_samr_chgpasswd_user4(pipe_hnd->binding_handle,
 212                                              talloc_tos(),
 213                                              pipe_hnd->srv_name_slash,
 214                                              user_name,
 215                                              old_passwd,
 216                                              new_passwd,
 217                                              &result);
 218         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
 219                 /* All good, password successfully changed. */
 220                 cli_shutdown(cli);
 221                 return NT_STATUS_OK;
 222         }
 223         if (!NT_STATUS_IS_OK(status)) {
 224                 if (NT_STATUS_EQUAL(status,
 225                                     NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE) ||
 226                     NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED) ||
 227                     NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)) {
 228                         /* DO NOT FALLBACK TO RC4 */
 229                         if (lp_weak_crypto() == SAMBA_WEAK_CRYPTO_DISALLOWED) {
 230                                 cli_shutdown(cli);
 231                                 return NT_STATUS_STRONG_CRYPTO_NOT_SUPPORTED;
 232                         }
 233                 }
 234         } else {
 235                 if (!NT_STATUS_IS_OK(result)) {
 236                         int rc = asprintf(
 237                                 err_str,
 238                                 "machine %s rejected to change the password"
 239                                 "with error: %s",
 240                                 remote_machine,
 241                                 get_friendly_nt_error_msg(result));
 242                         if (rc <= 0) {
 243                                 *err_str = NULL;
 244                         }
 245                         cli_shutdown(cli);
 246                         return result;
 247                 }
 248         }
 249
 250         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 251                                              user_name, new_passwd, old_passwd);
 252         if (NT_STATUS_IS_OK(result)) {
 253                 /* Great - it all worked! */
 254                 cli_shutdown(cli);
 255                 return NT_STATUS_OK;
 256         }
 257
 258         if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ||
 259               NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))
 260         {
 261                 /* it failed, but for reasons such as wrong password, too short etc ... */
 262
 263                 if (asprintf(err_str, "machine %s rejected the password change: "
 264                          "Error was : %s.\n",
 265                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 266                         *err_str = NULL;
 267                 }
 268                 cli_shutdown(cli);
 269                 return result;
 270         }
 271
 272         /* OK, that failed, so try again... */
 273         TALLOC_FREE(pipe_hnd);
 274
 275         /* OK, this is ugly, but... try an anonymous pipe. */
 276         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
 277                                           &pipe_hnd);
 278
 279         if ( NT_STATUS_IS_OK(result) &&
 280                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 281                                          pipe_hnd, talloc_tos(), user_name,
 282                                          new_passwd, old_passwd)))) {
 283                 /* Great - it all worked! */
 284                 cli_shutdown(cli);
 285                 return NT_STATUS_OK;
 286         } else {
 287                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 288                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 289                         /* it failed, but again it was due to things like new password too short */
 290
 291                         if (asprintf(err_str, "machine %s rejected the "
 292                                  "(anonymous) password change: Error was : "
 293                                  "%s.\n", remote_machine,
 294                                  get_friendly_nt_error_msg(result)) == -1) {
 295                                 *err_str = NULL;
 296                         }
 297                         cli_shutdown(cli);
 298                         return result;
 299                 }
 300
 301                 /* We have failed to change the user's password, and we think the server
 302                    just might not support SAMR password changes, so fall back */
 303
 304                 if (!lp_client_lanman_auth()) {
 305                         if (asprintf(err_str, "SAMR connection to machine %s "
 306                                  "failed. Error was %s, but LANMAN password "
 307                                  "changes are disabled\n",
 308                                 remote_machine, nt_errstr(result)) == -1) {
 309                                 *err_str = NULL;
 310                         }
 311                         cli_shutdown(cli);
 312                         return NT_STATUS_UNSUCCESSFUL;
 313                 }
 314
 315                 /* Use the old RAP method. */
 316                 result = cli_oem_change_password(cli,
 317                                                  user_name,
 318                                                  new_passwd,
 319                                                  old_passwd);
 320                 if (NT_STATUS_IS_OK(result)) {
 321                         /* SAMR failed, but the old LanMan protocol worked! */
 322
 323                         cli_shutdown(cli);
 324                         return NT_STATUS_OK;
 325                 }
 326
 327                 if (asprintf(err_str,
 328                              "machine %s rejected the password "
 329                              "change: Error was : %s.\n",
 330                              remote_machine,
 331                              nt_errstr(result)) == -1)
 332                 {
 333                         *err_str = NULL;
 334                 }
 335                 cli_shutdown(cli);
 336                 return result;
 337         }
 338 }