source/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
  22 /*************************************************************
  23  Change a password on a remote machine using IPC calls.
  24 *************************************************************/
  25
  26 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  27                             const char *old_passwd, const char *new_passwd,
  28                             char *err_str, size_t err_str_len)
  29 {
  30         struct nmb_name calling, called;
  31         struct cli_state *cli;
  32         struct rpc_pipe_client *pipe_hnd;
  33         struct in_addr ip;
  34
  35         NTSTATUS result;
  36         BOOL pass_must_change = False;
  37
  38         *err_str = '\0';
  39
  40         if(!resolve_name( remote_machine, &ip, 0x20)) {
  41                 slprintf(err_str, err_str_len-1, "Unable to find an IP address for machine %s.\n",
  42                         remote_machine );
  43                 return NT_STATUS_UNSUCCESSFUL;
  44         }
  45
  46         cli = cli_initialise();
  47         if (!cli) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50
  51         result = cli_connect(cli, remote_machine, &ip);
  52         if (!NT_STATUS_IS_OK(result)) {
  53                 slprintf(err_str, err_str_len-1, "Unable to connect to SMB server on machine %s. Error was : %s.\n",
  54                         remote_machine, nt_errstr(result) );
  55                 cli_shutdown(cli);
  56                 return result;
  57         }
  58
  59         make_nmb_name(&calling, global_myname() , 0x0);
  60         make_nmb_name(&called , remote_machine, 0x20);
  61
  62         if (!cli_session_request(cli, &calling, &called)) {
  63                 slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  64                         remote_machine, cli_errstr(cli) );
  65                 result = cli_nt_error(cli);
  66                 cli_shutdown(cli);
  67                 return result;
  68         }
  69
  70         cli->protocol = PROTOCOL_NT1;
  71
  72         if (!cli_negprot(cli)) {
  73                 slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
  74                         remote_machine, cli_errstr(cli) );
  75                 result = cli_nt_error(cli);
  76                 cli_shutdown(cli);
  77                 return result;
  78         }
  79
  80         /* Given things like SMB signing, restrict anonymous and the like,
  81            try an authenticated connection first */
  82         result = cli_session_setup(cli, user_name,
  83                                    old_passwd, strlen(old_passwd)+1,
  84                                    old_passwd, strlen(old_passwd)+1, "");
  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                         slprintf(err_str, err_str_len-1, "Could not "
  96                                  "connect to machine %s: %s\n",
  97                                  remote_machine, cli_errstr(cli));
  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(cli, "", "", 0, "", 0, "");
 111
 112                 if (!NT_STATUS_IS_OK(result)) {
 113                         slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
 114                                  remote_machine, cli_errstr(cli) );
 115                         cli_shutdown(cli);
 116                         return result;
 117                 }
 118
 119                 cli_init_creds(cli, "", "", NULL);
 120         } else {
 121                 cli_init_creds(cli, user_name, "", old_passwd);
 122         }
 123
 124         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 125                 slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
 126                         remote_machine, cli_errstr(cli) );
 127                 result = cli_nt_error(cli);
 128                 cli_shutdown(cli);
 129                 return result;
 130         }
 131
 132         /* Try not to give the password away too easily */
 133
 134         if (!pass_must_change) {
 135                 pipe_hnd = cli_rpc_pipe_open_ntlmssp(cli,
 136                                                 PI_SAMR,
 137                                                 PIPE_AUTH_LEVEL_PRIVACY,
 138                                                 "", /* what domain... ? */
 139                                                 user_name,
 140                                                 old_passwd,
 141                                                 &result);
 142         } else {
 143                 /*
 144                  * If the user password must be changed the ntlmssp bind will
 145                  * fail the same way as the session setup above did. The
 146                  * difference ist that with a pipe bind we don't get a good
 147                  * error message, the result will be that the rpc call below
 148                  * will just fail. So we do it anonymously, there's no other
 149                  * way.
 150                  */
 151                 pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 152         }
 153
 154         if (!pipe_hnd) {
 155                 if (lp_client_lanman_auth()) {
 156                         /* Use the old RAP method. */
 157                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 158                                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 159                                          remote_machine, cli_errstr(cli) );
 160                                 result = cli_nt_error(cli);
 161                                 cli_shutdown(cli);
 162                                 return result;
 163                         }
 164                 } else {
 165                         slprintf(err_str, err_str_len-1,
 166                                 "SAMR connection to machine %s failed. Error was %s, "
 167                                 "but LANMAN password changed are disabled\n",
 168                                 nt_errstr(result), remote_machine);
 169                         result = cli_nt_error(cli);
 170                         cli_shutdown(cli);
 171                         return result;
 172                 }
 173         }
 174
 175         if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli->mem_ctx, user_name,
 176                                                              new_passwd, old_passwd))) {
 177                 /* Great - it all worked! */
 178                 cli_shutdown(cli);
 179                 return NT_STATUS_OK;
 180
 181         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 182                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 183                 /* it failed, but for reasons such as wrong password, too short etc ... */
 184
 185                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 186                          remote_machine, get_friendly_nt_error_msg(result));
 187                 cli_shutdown(cli);
 188                 return result;
 189         }
 190
 191         /* OK, that failed, so try again... */
 192         cli_rpc_pipe_close(pipe_hnd);
 193
 194         /* Try anonymous NTLMSSP... */
 195         cli_init_creds(cli, "", "", NULL);
 196
 197         result = NT_STATUS_UNSUCCESSFUL;
 198
 199         /* OK, this is ugly, but... try an anonymous pipe. */
 200         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 201
 202         if ( pipe_hnd &&
 203                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
 204                                                 cli->mem_ctx,
 205                                                 user_name,
 206                                                 new_passwd,
 207                                                 old_passwd)))) {
 208                 /* Great - it all worked! */
 209                 cli_shutdown(cli);
 210                 return NT_STATUS_OK;
 211         } else {
 212                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 213                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 214                         /* it failed, but again it was due to things like new password too short */
 215
 216                         slprintf(err_str, err_str_len-1,
 217                                  "machine %s rejected the (anonymous) password change: Error was : %s.\n",
 218                                  remote_machine, get_friendly_nt_error_msg(result));
 219                         cli_shutdown(cli);
 220                         return result;
 221                 }
 222
 223                 /* We have failed to change the user's password, and we think the server
 224                    just might not support SAMR password changes, so fall back */
 225
 226                 if (lp_client_lanman_auth()) {
 227                         /* Use the old RAP method. */
 228                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 229                                 /* SAMR failed, but the old LanMan protocol worked! */
 230
 231                                 cli_shutdown(cli);
 232                                 return NT_STATUS_OK;
 233                         }
 234                         slprintf(err_str, err_str_len-1,
 235                                  "machine %s rejected the password change: Error was : %s.\n",
 236                                  remote_machine, cli_errstr(cli) );
 237                         result = cli_nt_error(cli);
 238                         cli_shutdown(cli);
 239                         return result;
 240                 } else {
 241                         slprintf(err_str, err_str_len-1,
 242                                 "SAMR connection to machine %s failed. Error was %s, "
 243                                 "but LANMAN password changed are disabled\n",
 244                                 nt_errstr(result), remote_machine);
 245                         cli_shutdown(cli);
 246                         return NT_STATUS_UNSUCCESSFUL;
 247                 }
 248         }
 249 }