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 result;
  42         bool pass_must_change = False;
  43
  44         *err_str = NULL;
  45
  46         result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
  47                                 SMB_SIGNING_IPC_DEFAULT, 0, &cli);
  48         if (!NT_STATUS_IS_OK(result)) {
  49                 if (NT_STATUS_EQUAL(result, NT_STATUS_NOT_SUPPORTED)) {
  50                         if (asprintf(err_str, "Unable to connect to SMB server on "
  51                                 "machine %s. NetBIOS support disabled\n",
  52                                 remote_machine) == -1) {
  53                                 *err_str = NULL;
  54                         }
  55                 } else {
  56                         if (asprintf(err_str, "Unable to connect to SMB server on "
  57                                  "machine %s. Error was : %s.\n",
  58                                  remote_machine, nt_errstr(result))==-1) {
  59                                 *err_str = NULL;
  60                         }
  61                 }
  62                 return result;
  63         }
  64
  65         creds = cli_session_creds_init(cli,
  66                                        user_name,
  67                                        domain,
  68                                        NULL, /* realm */
  69                                        old_passwd,
  70                                        false, /* use_kerberos */
  71                                        false, /* fallback_after_kerberos */
  72                                        false, /* use_ccache */
  73                                        false); /* password_is_nt_hash */
  74         SMB_ASSERT(creds != NULL);
  75
  76         result = smbXcli_negprot(cli->conn, cli->timeout,
  77                                  lp_client_ipc_min_protocol(),
  78                                  lp_client_ipc_max_protocol());
  79
  80         if (!NT_STATUS_IS_OK(result)) {
  81                 if (asprintf(err_str, "machine %s rejected the negotiate "
  82                          "protocol. Error was : %s.\n",
  83                          remote_machine, nt_errstr(result)) == -1) {
  84                         *err_str = NULL;
  85                 }
  86                 cli_shutdown(cli);
  87                 return result;
  88         }
  89
  90         /* Given things like SMB signing, restrict anonymous and the like,
  91            try an authenticated connection first */
  92         result = cli_session_setup_creds(cli, creds);
  93
  94         if (!NT_STATUS_IS_OK(result)) {
  95
  96                 /* Password must change or Password expired are the only valid
  97                  * error conditions here from where we can proceed, the rest like
  98                  * account locked out or logon failure will lead to errors later
  99                  * anyway */
 100
 101                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 102                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 103                         if (asprintf(err_str, "Could not connect to machine %s: "
 104                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
 105                                 *err_str = NULL;
 106                         }
 107                         cli_shutdown(cli);
 108                         return result;
 109                 }
 110
 111                 pass_must_change = True;
 112
 113                 /*
 114                  * We should connect as the anonymous user here, in case
 115                  * the server has "must change password" checked...
 116                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 117                  */
 118
 119                 result = cli_session_setup_anon(cli);
 120
 121                 if (!NT_STATUS_IS_OK(result)) {
 122                         if (asprintf(err_str, "machine %s rejected the session "
 123                                  "setup. Error was : %s.\n",
 124                                  remote_machine, nt_errstr(result)) == -1) {
 125                                 *err_str = NULL;
 126                         }
 127                         cli_shutdown(cli);
 128                         return result;
 129                 }
 130         }
 131
 132         result = cli_tree_connect(cli, "IPC$", "IPC", NULL);
 133         if (!NT_STATUS_IS_OK(result)) {
 134                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 135                              "IPC$ share. Error was : %s.\n",
 136                              remote_machine, nt_errstr(result))) {
 137                         *err_str = NULL;
 138                 }
 139                 cli_shutdown(cli);
 140                 return result;
 141         }
 142
 143         /* Try not to give the password away too easily */
 144
 145         if (!pass_must_change) {
 146                 result = cli_rpc_pipe_open_with_creds(cli,
 147                                                       &ndr_table_samr,
 148                                                       NCACN_NP,
 149                                                       DCERPC_AUTH_TYPE_NTLMSSP,
 150                                                       DCERPC_AUTH_LEVEL_PRIVACY,
 151                                                       remote_machine,
 152                                                       creds,
 153                                                       &pipe_hnd);
 154         } else {
 155                 /*
 156                  * If the user password must be changed the ntlmssp bind will
 157                  * fail the same way as the session setup above did. The
 158                  * difference ist that with a pipe bind we don't get a good
 159                  * error message, the result will be that the rpc call below
 160                  * will just fail. So we do it anonymously, there's no other
 161                  * way.
 162                  */
 163                 result = cli_rpc_pipe_open_noauth(
 164                         cli, &ndr_table_samr, &pipe_hnd);
 165         }
 166
 167         if (!NT_STATUS_IS_OK(result)) {
 168                 if (lp_client_lanman_auth()) {
 169                         /* Use the old RAP method. */
 170                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 171                                 result = cli_nt_error(cli);
 172                                 if (asprintf(err_str, "machine %s rejected the "
 173                                          "password change: Error was : %s.\n",
 174                                          remote_machine, nt_errstr(result)) == -1) {
 175                                         *err_str = NULL;
 176                                 }
 177                                 cli_shutdown(cli);
 178                                 return result;
 179                         }
 180                 } else {
 181                         if (asprintf(err_str, "SAMR connection to machine %s "
 182                                  "failed. Error was %s, but LANMAN password "
 183                                  "changes are disabled\n",
 184                                  remote_machine, nt_errstr(result)) == -1) {
 185                                 *err_str = NULL;
 186                         }
 187                         cli_shutdown(cli);
 188                         return result;
 189                 }
 190         }
 191
 192         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 193                                              user_name, new_passwd, old_passwd);
 194         if (NT_STATUS_IS_OK(result)) {
 195                 /* Great - it all worked! */
 196                 cli_shutdown(cli);
 197                 return NT_STATUS_OK;
 198
 199         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 200                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 201                 /* it failed, but for reasons such as wrong password, too short etc ... */
 202
 203                 if (asprintf(err_str, "machine %s rejected the password change: "
 204                          "Error was : %s.\n",
 205                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 206                         *err_str = NULL;
 207                 }
 208                 cli_shutdown(cli);
 209                 return result;
 210         }
 211
 212         /* OK, that failed, so try again... */
 213         TALLOC_FREE(pipe_hnd);
 214
 215         /* Try anonymous NTLMSSP... */
 216         result = NT_STATUS_UNSUCCESSFUL;
 217
 218         /* OK, this is ugly, but... try an anonymous pipe. */
 219         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
 220                                           &pipe_hnd);
 221
 222         if ( NT_STATUS_IS_OK(result) &&
 223                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 224                                          pipe_hnd, talloc_tos(), user_name,
 225                                          new_passwd, old_passwd)))) {
 226                 /* Great - it all worked! */
 227                 cli_shutdown(cli);
 228                 return NT_STATUS_OK;
 229         } else {
 230                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 231                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 232                         /* it failed, but again it was due to things like new password too short */
 233
 234                         if (asprintf(err_str, "machine %s rejected the "
 235                                  "(anonymous) password change: Error was : "
 236                                  "%s.\n", remote_machine,
 237                                  get_friendly_nt_error_msg(result)) == -1) {
 238                                 *err_str = NULL;
 239                         }
 240                         cli_shutdown(cli);
 241                         return result;
 242                 }
 243
 244                 /* We have failed to change the user's password, and we think the server
 245                    just might not support SAMR password changes, so fall back */
 246
 247                 if (lp_client_lanman_auth()) {
 248                         /* Use the old RAP method. */
 249                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 250                                 /* SAMR failed, but the old LanMan protocol worked! */
 251
 252                                 cli_shutdown(cli);
 253                                 return NT_STATUS_OK;
 254                         }
 255
 256                         result = cli_nt_error(cli);
 257                         if (asprintf(err_str, "machine %s rejected the password "
 258                                  "change: Error was : %s.\n",
 259                                  remote_machine, nt_errstr(result)) == -1) {
 260                                 *err_str = NULL;
 261                         }
 262                         cli_shutdown(cli);
 263                         return result;
 264                 } else {
 265                         if (asprintf(err_str, "SAMR connection to machine %s "
 266                                  "failed. Error was %s, but LANMAN password "
 267                                  "changes are disabled\n",
 268                                 remote_machine, nt_errstr(result)) == -1) {
 269                                 *err_str = NULL;
 270                         }
 271                         cli_shutdown(cli);
 272                         return NT_STATUS_UNSUCCESSFUL;
 273                 }
 274         }
 275 }