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