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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /*************************************************************
  24  Change a password on a remote machine using IPC calls.
  25 *************************************************************/
  26
  27 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  28                             const char *old_passwd, const char *new_passwd,
  29                             char *err_str, size_t err_str_len)
  30 {
  31         struct nmb_name calling, called;
  32         struct cli_state cli;
  33         struct rpc_pipe_client *pipe_hnd;
  34         struct in_addr ip;
  35
  36         NTSTATUS result;
  37         BOOL pass_must_change = False;
  38
  39         *err_str = '\0';
  40
  41         if(!resolve_name( remote_machine, &ip, 0x20)) {
  42                 slprintf(err_str, err_str_len-1, "unable to find an IP address for machine %s.\n",
  43                         remote_machine );
  44                 return NT_STATUS_UNSUCCESSFUL;
  45         }
  46
  47         ZERO_STRUCT(cli);
  48
  49         if (!cli_initialise(&cli) || !cli_connect(&cli, remote_machine, &ip)) {
  50                 slprintf(err_str, err_str_len-1, "unable to connect to SMB server on machine %s. Error was : %s.\n",
  51                         remote_machine, cli_errstr(&cli) );
  52                 return NT_STATUS_UNSUCCESSFUL;
  53         }
  54
  55         make_nmb_name(&calling, global_myname() , 0x0);
  56         make_nmb_name(&called , remote_machine, 0x20);
  57
  58         if (!cli_session_request(&cli, &calling, &called)) {
  59                 slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  60                         remote_machine, cli_errstr(&cli) );
  61                 cli_shutdown(&cli);
  62                 return NT_STATUS_UNSUCCESSFUL;
  63         }
  64
  65         cli.protocol = PROTOCOL_NT1;
  66
  67         if (!cli_negprot(&cli)) {
  68                 slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
  69                         remote_machine, cli_errstr(&cli) );
  70                 result = cli_nt_error(&cli);
  71                 cli_shutdown(&cli);
  72                 return result;
  73         }
  74
  75         /* Given things like SMB signing, restrict anonymous and the like,
  76            try an authenticated connection first */
  77         if (!cli_session_setup(&cli, user_name, old_passwd, strlen(old_passwd)+1, old_passwd, strlen(old_passwd)+1, "")) {
  78
  79                 result = cli_nt_error(&cli);
  80
  81                 if (!NT_STATUS_IS_OK(result)) {
  82
  83                         /* Password must change is the only valid error
  84                          * condition here from where we can proceed, the rest
  85                          * like account locked out or logon failure will lead
  86                          * to errors later anyway */
  87
  88                         if (!NT_STATUS_EQUAL(result,
  89                                              NT_STATUS_PASSWORD_MUST_CHANGE)) {
  90                                 slprintf(err_str, err_str_len-1, "Could not "
  91                                          "connect to machine %s: %s\n",
  92                                          remote_machine, cli_errstr(&cli));
  93                                 cli_shutdown(&cli);
  94                                 return result;
  95                         }
  96
  97                         pass_must_change = True;
  98                 }
  99
 100                 /*
 101                  * We should connect as the anonymous user here, in case
 102                  * the server has "must change password" checked...
 103                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 104                  */
 105
 106                 if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
 107                         slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
 108                                  remote_machine, cli_errstr(&cli) );
 109                         result = cli_nt_error(&cli);
 110                         cli_shutdown(&cli);
 111                         return result;
 112                 }
 113
 114                 cli_init_creds(&cli, "", "", NULL);
 115         } else {
 116                 cli_init_creds(&cli, user_name, "", old_passwd);
 117         }
 118
 119         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 120                 slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
 121                         remote_machine, cli_errstr(&cli) );
 122                 result = cli_nt_error(&cli);
 123                 cli_shutdown(&cli);
 124                 return result;
 125         }
 126
 127         /* Try not to give the password away too easily */
 128
 129         if (!pass_must_change) {
 130                 pipe_hnd = cli_rpc_pipe_open_ntlmssp(&cli,
 131                                                 PI_SAMR,
 132                                                 PIPE_AUTH_LEVEL_PRIVACY,
 133                                                 "", /* what domain... ? */
 134                                                 user_name,
 135                                                 old_passwd,
 136                                                 &result);
 137         } else {
 138                 /*
 139                  * If the user password must be changed the ntlmssp bind will
 140                  * fail the same way as the session setup above did. The
 141                  * difference ist that with a pipe bind we don't get a good
 142                  * error message, the result will be that the rpc call below
 143                  * will just fail. So we do it anonymously, there's no other
 144                  * way.
 145                  */
 146                 pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
 147         }
 148
 149         if (!pipe_hnd) {
 150                 if (lp_client_lanman_auth()) {
 151                         /* Use the old RAP method. */
 152                         if (!cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 153                                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 154                                          remote_machine, cli_errstr(&cli) );
 155                                 result = cli_nt_error(&cli);
 156                                 cli_shutdown(&cli);
 157                                 return result;
 158                         }
 159                 } else {
 160                         slprintf(err_str, err_str_len-1,
 161                                 "SAMR connection to machine %s failed. Error was %s, "
 162                                 "but LANMAN password changed are disabled\n",
 163                                 nt_errstr(result), remote_machine);
 164                         result = cli_nt_error(&cli);
 165                         cli_shutdown(&cli);
 166                         return result;
 167                 }
 168         }
 169
 170         if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli.mem_ctx, user_name,
 171                                                              new_passwd, old_passwd))) {
 172                 /* Great - it all worked! */
 173                 cli_shutdown(&cli);
 174                 return NT_STATUS_OK;
 175
 176         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 177                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 178                 /* it failed, but for reasons such as wrong password, too short etc ... */
 179
 180                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 181                          remote_machine, get_friendly_nt_error_msg(result));
 182                 cli_shutdown(&cli);
 183                 return result;
 184         }
 185
 186         /* OK, that failed, so try again... */
 187         cli_rpc_pipe_close(pipe_hnd);
 188
 189         /* Try anonymous NTLMSSP... */
 190         cli_init_creds(&cli, "", "", NULL);
 191
 192         result = NT_STATUS_UNSUCCESSFUL;
 193
 194         /* OK, this is ugly, but... try an anonymous pipe. */
 195         pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
 196
 197         if ( pipe_hnd &&
 198                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
 199                                                 cli.mem_ctx,
 200                                                 user_name,
 201                                                 new_passwd,
 202                                                 old_passwd)))) {
 203                 /* Great - it all worked! */
 204                 cli_shutdown(&cli);
 205                 return NT_STATUS_OK;
 206         } else {
 207                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 208                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 209                         /* it failed, but again it was due to things like new password too short */
 210
 211                         slprintf(err_str, err_str_len-1,
 212                                  "machine %s rejected the (anonymous) password change: Error was : %s.\n",
 213                                  remote_machine, get_friendly_nt_error_msg(result));
 214                         cli_shutdown(&cli);
 215                         return result;
 216                 }
 217
 218                 /* We have failed to change the user's password, and we think the server
 219                    just might not support SAMR password changes, so fall back */
 220
 221                 if (lp_client_lanman_auth()) {
 222                         /* Use the old RAP method. */
 223                         if (cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 224                                 /* SAMR failed, but the old LanMan protocol worked! */
 225
 226                                 cli_shutdown(&cli);
 227                                 return NT_STATUS_OK;
 228                         }
 229                         slprintf(err_str, err_str_len-1,
 230                                  "machine %s rejected the password change: Error was : %s.\n",
 231                                  remote_machine, cli_errstr(&cli) );
 232                         result = cli_nt_error(&cli);
 233                         cli_shutdown(&cli);
 234                         return result;
 235                 } else {
 236                         slprintf(err_str, err_str_len-1,
 237                                 "SAMR connection to machine %s failed. Error was %s, "
 238                                 "but LANMAN password changed are disabled\n",
 239                                 nt_errstr(result), remote_machine);
 240                         cli_shutdown(&cli);
 241                         return NT_STATUS_UNSUCCESSFUL;
 242                 }
 243         }
 244 }