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, const char *user_name,
  34                                 const char *old_passwd, const char *new_passwd,
  35                                 char **err_str)
  36 {
  37         struct cli_state *cli = NULL;
  38         struct cli_credentials *creds = NULL;
  39         struct rpc_pipe_client *pipe_hnd = NULL;
  40         NTSTATUS result;
  41         bool pass_must_change = False;
  42
  43         *err_str = NULL;
  44
  45         result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
  46                                 SMB_SIGNING_IPC_DEFAULT, 0, &cli);
  47         if (!NT_STATUS_IS_OK(result)) {
  48                 if (asprintf(err_str, "Unable to connect to SMB server on "
  49                          "machine %s. Error was : %s.\n",
  50                          remote_machine, nt_errstr(result))==-1) {
  51                         *err_str = NULL;
  52                 }
  53                 return result;
  54         }
  55
  56         creds = cli_session_creds_init(cli,
  57                                        user_name,
  58                                        NULL, /* domain */
  59                                        NULL, /* realm */
  60                                        old_passwd,
  61                                        false, /* use_kerberos */
  62                                        false, /* fallback_after_kerberos */
  63                                        false, /* use_ccache */
  64                                        false); /* password_is_nt_hash */
  65         SMB_ASSERT(creds != NULL);
  66
  67         result = smbXcli_negprot(cli->conn, cli->timeout,
  68                                  lp_client_ipc_min_protocol(),
  69                                  lp_client_ipc_max_protocol());
  70
  71         if (!NT_STATUS_IS_OK(result)) {
  72                 if (asprintf(err_str, "machine %s rejected the negotiate "
  73                          "protocol. Error was : %s.\n",
  74                          remote_machine, nt_errstr(result)) == -1) {
  75                         *err_str = NULL;
  76                 }
  77                 cli_shutdown(cli);
  78                 return result;
  79         }
  80
  81         /* Given things like SMB signing, restrict anonymous and the like,
  82            try an authenticated connection first */
  83         result = cli_session_setup_creds(cli, creds);
  84
  85         if (!NT_STATUS_IS_OK(result)) {
  86
  87                 /* Password must change or Password expired are the only valid
  88                  * error conditions here from where we can proceed, the rest like
  89                  * account locked out or logon failure will lead to errors later
  90                  * anyway */
  91
  92                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
  93                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
  94                         if (asprintf(err_str, "Could not connect to machine %s: "
  95                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
  96                                 *err_str = NULL;
  97                         }
  98                         cli_shutdown(cli);
  99                         return result;
 100                 }
 101
 102                 pass_must_change = True;
 103
 104                 /*
 105                  * We should connect as the anonymous user here, in case
 106                  * the server has "must change password" checked...
 107                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 108                  */
 109
 110                 result = cli_session_setup_anon(cli);
 111
 112                 if (!NT_STATUS_IS_OK(result)) {
 113                         if (asprintf(err_str, "machine %s rejected the session "
 114                                  "setup. Error was : %s.\n",
 115                                  remote_machine, nt_errstr(result)) == -1) {
 116                                 *err_str = NULL;
 117                         }
 118                         cli_shutdown(cli);
 119                         return result;
 120                 }
 121         }
 122
 123         result = cli_tree_connect(cli, "IPC$", "IPC", NULL);
 124         if (!NT_STATUS_IS_OK(result)) {
 125                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 126                              "IPC$ share. Error was : %s.\n",
 127                              remote_machine, nt_errstr(result))) {
 128                         *err_str = NULL;
 129                 }
 130                 cli_shutdown(cli);
 131                 return result;
 132         }
 133
 134         /* Try not to give the password away too easily */
 135
 136         if (!pass_must_change) {
 137                 result = cli_rpc_pipe_open_with_creds(cli,
 138                                                       &ndr_table_samr,
 139                                                       NCACN_NP,
 140                                                       DCERPC_AUTH_TYPE_NTLMSSP,
 141                                                       DCERPC_AUTH_LEVEL_PRIVACY,
 142                                                       remote_machine,
 143                                                       creds,
 144                                                       &pipe_hnd);
 145         } else {
 146                 /*
 147                  * If the user password must be changed the ntlmssp bind will
 148                  * fail the same way as the session setup above did. The
 149                  * difference ist that with a pipe bind we don't get a good
 150                  * error message, the result will be that the rpc call below
 151                  * will just fail. So we do it anonymously, there's no other
 152                  * way.
 153                  */
 154                 result = cli_rpc_pipe_open_noauth(
 155                         cli, &ndr_table_samr, &pipe_hnd);
 156         }
 157
 158         if (!NT_STATUS_IS_OK(result)) {
 159                 if (lp_client_lanman_auth()) {
 160                         /* Use the old RAP method. */
 161                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 162                                 result = cli_nt_error(cli);
 163                                 if (asprintf(err_str, "machine %s rejected the "
 164                                          "password change: Error was : %s.\n",
 165                                          remote_machine, nt_errstr(result)) == -1) {
 166                                         *err_str = NULL;
 167                                 }
 168                                 cli_shutdown(cli);
 169                                 return result;
 170                         }
 171                 } else {
 172                         if (asprintf(err_str, "SAMR connection to machine %s "
 173                                  "failed. Error was %s, but LANMAN password "
 174                                  "changes are disabled\n",
 175                                  remote_machine, nt_errstr(result)) == -1) {
 176                                 *err_str = NULL;
 177                         }
 178                         cli_shutdown(cli);
 179                         return result;
 180                 }
 181         }
 182
 183         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 184                                              user_name, new_passwd, old_passwd);
 185         if (NT_STATUS_IS_OK(result)) {
 186                 /* Great - it all worked! */
 187                 cli_shutdown(cli);
 188                 return NT_STATUS_OK;
 189
 190         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 191                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 192                 /* it failed, but for reasons such as wrong password, too short etc ... */
 193
 194                 if (asprintf(err_str, "machine %s rejected the password change: "
 195                          "Error was : %s.\n",
 196                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 197                         *err_str = NULL;
 198                 }
 199                 cli_shutdown(cli);
 200                 return result;
 201         }
 202
 203         /* OK, that failed, so try again... */
 204         TALLOC_FREE(pipe_hnd);
 205
 206         /* Try anonymous NTLMSSP... */
 207         result = NT_STATUS_UNSUCCESSFUL;
 208
 209         /* OK, this is ugly, but... try an anonymous pipe. */
 210         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
 211                                           &pipe_hnd);
 212
 213         if ( NT_STATUS_IS_OK(result) &&
 214                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 215                                          pipe_hnd, talloc_tos(), user_name,
 216                                          new_passwd, old_passwd)))) {
 217                 /* Great - it all worked! */
 218                 cli_shutdown(cli);
 219                 return NT_STATUS_OK;
 220         } else {
 221                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 222                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 223                         /* it failed, but again it was due to things like new password too short */
 224
 225                         if (asprintf(err_str, "machine %s rejected the "
 226                                  "(anonymous) password change: Error was : "
 227                                  "%s.\n", remote_machine,
 228                                  get_friendly_nt_error_msg(result)) == -1) {
 229                                 *err_str = NULL;
 230                         }
 231                         cli_shutdown(cli);
 232                         return result;
 233                 }
 234
 235                 /* We have failed to change the user's password, and we think the server
 236                    just might not support SAMR password changes, so fall back */
 237
 238                 if (lp_client_lanman_auth()) {
 239                         /* Use the old RAP method. */
 240                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 241                                 /* SAMR failed, but the old LanMan protocol worked! */
 242
 243                                 cli_shutdown(cli);
 244                                 return NT_STATUS_OK;
 245                         }
 246
 247                         result = cli_nt_error(cli);
 248                         if (asprintf(err_str, "machine %s rejected the password "
 249                                  "change: Error was : %s.\n",
 250                                  remote_machine, nt_errstr(result)) == -1) {
 251                                 *err_str = NULL;
 252                         }
 253                         cli_shutdown(cli);
 254                         return result;
 255                 } else {
 256                         if (asprintf(err_str, "SAMR connection to machine %s "
 257                                  "failed. Error was %s, but LANMAN password "
 258                                  "changes are disabled\n",
 259                                 remote_machine, nt_errstr(result)) == -1) {
 260                                 *err_str = NULL;
 261                         }
 262                         cli_shutdown(cli);
 263                         return NT_STATUS_UNSUCCESSFUL;
 264                 }
 265         }
 266 }