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(remote_machine, NULL, 0, 0x20, NULL,
  48                                 SMB_SIGNING_IPC_DEFAULT, 0, &cli);
  49         if (!NT_STATUS_IS_OK(result)) {
  50                 if (NT_STATUS_EQUAL(result, NT_STATUS_NOT_SUPPORTED)) {
  51                         if (asprintf(err_str, "Unable to connect to SMB server on "
  52                                 "machine %s. NetBIOS support disabled\n",
  53                                 remote_machine) == -1) {
  54                                 *err_str = NULL;
  55                         }
  56                 } else {
  57                         if (asprintf(err_str, "Unable to connect to SMB server on "
  58                                  "machine %s. Error was : %s.\n",
  59                                  remote_machine, nt_errstr(result))==-1) {
  60                                 *err_str = NULL;
  61                         }
  62                 }
  63                 return result;
  64         }
  65
  66         creds = cli_session_creds_init(cli,
  67                                        user_name,
  68                                        domain,
  69                                        NULL, /* realm */
  70                                        old_passwd,
  71                                        false, /* use_kerberos */
  72                                        false, /* fallback_after_kerberos */
  73                                        false, /* use_ccache */
  74                                        false); /* password_is_nt_hash */
  75         SMB_ASSERT(creds != NULL);
  76
  77         result = smbXcli_negprot(cli->conn, cli->timeout,
  78                                  lp_client_ipc_min_protocol(),
  79                                  lp_client_ipc_max_protocol());
  80
  81         if (!NT_STATUS_IS_OK(result)) {
  82                 if (asprintf(err_str, "machine %s rejected the negotiate "
  83                          "protocol. Error was : %s.\n",
  84                          remote_machine, nt_errstr(result)) == -1) {
  85                         *err_str = NULL;
  86                 }
  87                 cli_shutdown(cli);
  88                 return result;
  89         }
  90
  91         /* Given things like SMB signing, restrict anonymous and the like,
  92            try an authenticated connection first */
  93         result = cli_session_setup_creds(cli, creds);
  94
  95         if (!NT_STATUS_IS_OK(result)) {
  96
  97                 /* Password must change or Password expired are the only valid
  98                  * error conditions here from where we can proceed, the rest like
  99                  * account locked out or logon failure will lead to errors later
 100                  * anyway */
 101
 102                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 103                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 104                         if (asprintf(err_str, "Could not connect to machine %s: "
 105                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
 106                                 *err_str = NULL;
 107                         }
 108                         cli_shutdown(cli);
 109                         return result;
 110                 }
 111
 112                 pass_must_change = True;
 113
 114                 /*
 115                  * We should connect as the anonymous user here, in case
 116                  * the server has "must change password" checked...
 117                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 118                  */
 119
 120                 result = cli_session_setup_anon(cli);
 121
 122                 if (!NT_STATUS_IS_OK(result)) {
 123                         if (asprintf(err_str, "machine %s rejected the session "
 124                                  "setup. Error was : %s.\n",
 125                                  remote_machine, nt_errstr(result)) == -1) {
 126                                 *err_str = NULL;
 127                         }
 128                         cli_shutdown(cli);
 129                         return result;
 130                 }
 131         }
 132
 133         result = cli_tree_connect(cli, "IPC$", "IPC", NULL);
 134         if (!NT_STATUS_IS_OK(result)) {
 135                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 136                              "IPC$ share. Error was : %s.\n",
 137                              remote_machine, nt_errstr(result))) {
 138                         *err_str = NULL;
 139                 }
 140                 cli_shutdown(cli);
 141                 return result;
 142         }
 143
 144         /* Try not to give the password away too easily */
 145
 146         if (!pass_must_change) {
 147                 const struct sockaddr_storage *remote_sockaddr =
 148                         smbXcli_conn_remote_sockaddr(cli->conn);
 149
 150                 result = cli_rpc_pipe_open_with_creds(cli,
 151                                                       &ndr_table_samr,
 152                                                       NCACN_NP,
 153                                                       DCERPC_AUTH_TYPE_NTLMSSP,
 154                                                       DCERPC_AUTH_LEVEL_PRIVACY,
 155                                                       remote_machine,
 156                                                       remote_sockaddr,
 157                                                       creds,
 158                                                       &pipe_hnd);
 159         } else {
 160                 /*
 161                  * If the user password must be changed the ntlmssp bind will
 162                  * fail the same way as the session setup above did. The
 163                  * difference ist that with a pipe bind we don't get a good
 164                  * error message, the result will be that the rpc call below
 165                  * will just fail. So we do it anonymously, there's no other
 166                  * way.
 167                  */
 168                 result = cli_rpc_pipe_open_noauth(
 169                         cli, &ndr_table_samr, &pipe_hnd);
 170         }
 171
 172         if (!NT_STATUS_IS_OK(result)) {
 173                 if (lp_client_lanman_auth()) {
 174                         /* Use the old RAP method. */
 175                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 176                                 result = cli_nt_error(cli);
 177                                 if (asprintf(err_str, "machine %s rejected the "
 178                                          "password change: Error was : %s.\n",
 179                                          remote_machine, nt_errstr(result)) == -1) {
 180                                         *err_str = NULL;
 181                                 }
 182                                 cli_shutdown(cli);
 183                                 return result;
 184                         }
 185                 } else {
 186                         if (asprintf(err_str, "SAMR connection to machine %s "
 187                                  "failed. Error was %s, but LANMAN password "
 188                                  "changes are disabled\n",
 189                                  remote_machine, nt_errstr(result)) == -1) {
 190                                 *err_str = NULL;
 191                         }
 192                         cli_shutdown(cli);
 193                         return result;
 194                 }
 195         }
 196
 197         status = dcerpc_samr_chgpasswd_user4(pipe_hnd->binding_handle,
 198                                              talloc_tos(),
 199                                              pipe_hnd->srv_name_slash,
 200                                              user_name,
 201                                              old_passwd,
 202                                              new_passwd,
 203                                              &result);
 204         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
 205                 /* All good, password successfully changed. */
 206                 cli_shutdown(cli);
 207                 return NT_STATUS_OK;
 208         }
 209         if (!NT_STATUS_IS_OK(status)) {
 210                 if (NT_STATUS_EQUAL(status,
 211                                     NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE) ||
 212                     NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED) ||
 213                     NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)) {
 214                         /* DO NOT FALLBACK TO RC4 */
 215                         if (lp_weak_crypto() == SAMBA_WEAK_CRYPTO_DISALLOWED) {
 216                                 cli_shutdown(cli);
 217                                 return NT_STATUS_STRONG_CRYPTO_NOT_SUPPORTED;
 218                         }
 219                 }
 220         } else {
 221                 if (!NT_STATUS_IS_OK(result)) {
 222                         int rc = asprintf(
 223                                 err_str,
 224                                 "machine %s rejected to change the password"
 225                                 "with error: %s",
 226                                 remote_machine,
 227                                 get_friendly_nt_error_msg(result));
 228                         if (rc <= 0) {
 229                                 *err_str = NULL;
 230                         }
 231                         cli_shutdown(cli);
 232                         return result;
 233                 }
 234         }
 235
 236         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 237                                              user_name, new_passwd, old_passwd);
 238         if (NT_STATUS_IS_OK(result)) {
 239                 /* Great - it all worked! */
 240                 cli_shutdown(cli);
 241                 return NT_STATUS_OK;
 242
 243         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 244                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 245                 /* it failed, but for reasons such as wrong password, too short etc ... */
 246
 247                 if (asprintf(err_str, "machine %s rejected the password change: "
 248                          "Error was : %s.\n",
 249                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 250                         *err_str = NULL;
 251                 }
 252                 cli_shutdown(cli);
 253                 return result;
 254         }
 255
 256         /* OK, that failed, so try again... */
 257         TALLOC_FREE(pipe_hnd);
 258
 259         /* Try anonymous NTLMSSP... */
 260         result = NT_STATUS_UNSUCCESSFUL;
 261
 262         /* OK, this is ugly, but... try an anonymous pipe. */
 263         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
 264                                           &pipe_hnd);
 265
 266         if ( NT_STATUS_IS_OK(result) &&
 267                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 268                                          pipe_hnd, talloc_tos(), user_name,
 269                                          new_passwd, old_passwd)))) {
 270                 /* Great - it all worked! */
 271                 cli_shutdown(cli);
 272                 return NT_STATUS_OK;
 273         } else {
 274                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 275                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 276                         /* it failed, but again it was due to things like new password too short */
 277
 278                         if (asprintf(err_str, "machine %s rejected the "
 279                                  "(anonymous) password change: Error was : "
 280                                  "%s.\n", remote_machine,
 281                                  get_friendly_nt_error_msg(result)) == -1) {
 282                                 *err_str = NULL;
 283                         }
 284                         cli_shutdown(cli);
 285                         return result;
 286                 }
 287
 288                 /* We have failed to change the user's password, and we think the server
 289                    just might not support SAMR password changes, so fall back */
 290
 291                 if (lp_client_lanman_auth()) {
 292                         /* Use the old RAP method. */
 293                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 294                                 /* SAMR failed, but the old LanMan protocol worked! */
 295
 296                                 cli_shutdown(cli);
 297                                 return NT_STATUS_OK;
 298                         }
 299
 300                         result = cli_nt_error(cli);
 301                         if (asprintf(err_str, "machine %s rejected the password "
 302                                  "change: Error was : %s.\n",
 303                                  remote_machine, nt_errstr(result)) == -1) {
 304                                 *err_str = NULL;
 305                         }
 306                         cli_shutdown(cli);
 307                         return result;
 308                 } else {
 309                         if (asprintf(err_str, "SAMR connection to machine %s "
 310                                  "failed. Error was %s, but LANMAN password "
 311                                  "changes are disabled\n",
 312                                 remote_machine, nt_errstr(result)) == -1) {
 313                                 *err_str = NULL;
 314                         }
 315                         cli_shutdown(cli);
 316                         return NT_STATUS_UNSUCCESSFUL;
 317                 }
 318         }
 319 }