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 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 BOOL 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 in_addr ip;
  33         struct ntuser_creds creds;
  34
  35         NTSTATUS result;
  36
  37         *err_str = '\0';
  38
  39         if(!resolve_name( remote_machine, &ip, 0x20)) {
  40                 slprintf(err_str, err_str_len-1, "unable to find an IP address for machine %s.\n",
  41                         remote_machine );
  42                 return False;
  43         }
  44
  45         ZERO_STRUCT(cli);
  46
  47         if (!cli_initialise(&cli) || !cli_connect(&cli, remote_machine, &ip)) {
  48                 slprintf(err_str, err_str_len-1, "unable to connect to SMB server on machine %s. Error was : %s.\n",
  49                         remote_machine, cli_errstr(&cli) );
  50                 return False;
  51         }
  52
  53         make_nmb_name(&calling, global_myname() , 0x0);
  54         make_nmb_name(&called , remote_machine, 0x20);
  55
  56         if (!cli_session_request(&cli, &calling, &called)) {
  57                 slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  58                         remote_machine, cli_errstr(&cli) );
  59                 cli_shutdown(&cli);
  60                 return False;
  61         }
  62
  63         cli.protocol = PROTOCOL_NT1;
  64
  65         if (!cli_negprot(&cli)) {
  66                 slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
  67                         remote_machine, cli_errstr(&cli) );
  68                 cli_shutdown(&cli);
  69                 return False;
  70         }
  71
  72         /* Given things like SMB signing, restrict anonymous and the like,
  73            try an authenticated connection first */
  74         if (!cli_session_setup(&cli, user_name, old_passwd, strlen(old_passwd)+1, old_passwd, strlen(old_passwd)+1, "")) {
  75                 /*
  76                  * We should connect as the anonymous user here, in case
  77                  * the server has "must change password" checked...
  78                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
  79                  */
  80
  81                 if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
  82                         slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  83                                  remote_machine, cli_errstr(&cli) );
  84                         cli_shutdown(&cli);
  85                         return False;
  86                 }
  87
  88                 init_creds(&creds, "", "", NULL);
  89                 cli_init_creds(&cli, &creds);
  90         } else {
  91                 init_creds(&creds, user_name, "", old_passwd);
  92                 cli_init_creds(&cli, &creds);
  93         }
  94
  95         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
  96                 slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
  97                         remote_machine, cli_errstr(&cli) );
  98                 cli_shutdown(&cli);
  99                 return False;
 100         }
 101
 102         /* Try not to give the password away to easily */
 103
 104         cli.pipe_auth_flags = AUTH_PIPE_NTLMSSP;
 105         cli.pipe_auth_flags |= AUTH_PIPE_SIGN;
 106         cli.pipe_auth_flags |= AUTH_PIPE_SEAL;
 107
 108         if ( !cli_nt_session_open( &cli, PI_SAMR ) ) {
 109                 if (lp_client_lanman_auth()) {
 110                         if (!cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 111                                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 112                                          remote_machine, cli_errstr(&cli) );
 113                                 cli_shutdown(&cli);
 114                                 return False;
 115                         }
 116                 } else {
 117                         slprintf(err_str, err_str_len-1, "machine %s does not support SAMR connections, but LANMAN password changed are disabled\n",
 118                                  remote_machine);
 119                         cli_shutdown(&cli);
 120                         return False;
 121                 }
 122         }
 123
 124         if (NT_STATUS_IS_OK(result = cli_samr_chgpasswd_user(&cli, cli.mem_ctx, user_name,
 125                                                              new_passwd, old_passwd))) {
 126                 /* Great - it all worked! */
 127                 cli_shutdown(&cli);
 128                 return True;
 129
 130         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 131                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 132                 /* it failed, but for reasons such as wrong password, too short etc ... */
 133
 134                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 135                          remote_machine, get_friendly_nt_error_msg(result));
 136                 cli_shutdown(&cli);
 137                 return False;
 138         }
 139
 140         /* OK, that failed, so try again... */
 141         cli_nt_session_close(&cli);
 142
 143         /* Try anonymous NTLMSSP... */
 144         init_creds(&creds, "", "", NULL);
 145         cli_init_creds(&cli, &creds);
 146
 147         result = NT_STATUS_UNSUCCESSFUL;
 148
 149         /* OK, this is ugly, but... */
 150         if ( cli_nt_session_open( &cli, PI_SAMR )
 151              && NT_STATUS_IS_OK(result
 152                                 = cli_samr_chgpasswd_user(&cli, cli.mem_ctx, user_name,
 153                                                           new_passwd, old_passwd))) {
 154                 /* Great - it all worked! */
 155                 cli_shutdown(&cli);
 156                 return True;
 157
 158         } else {
 159                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 160                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 161                         /* it failed, but again it was due to things like new password too short */
 162
 163                         slprintf(err_str, err_str_len-1,
 164                                  "machine %s rejected the (anonymous) password change: Error was : %s.\n",
 165                                  remote_machine, get_friendly_nt_error_msg(result));
 166                         cli_shutdown(&cli);
 167                         return False;
 168                 }
 169
 170                 /* We have failed to change the user's password, and we think the server
 171                    just might not support SAMR password changes, so fall back */
 172
 173                 if (lp_client_lanman_auth()) {
 174                         if (cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 175                                 /* SAMR failed, but the old LanMan protocol worked! */
 176
 177                                 cli_shutdown(&cli);
 178                                 return True;
 179                         }
 180                         slprintf(err_str, err_str_len-1,
 181                                  "machine %s rejected the password change: Error was : %s.\n",
 182                                  remote_machine, cli_errstr(&cli) );
 183                         cli_shutdown(&cli);
 184                         return False;
 185                 } else {
 186                         slprintf(err_str, err_str_len-1,
 187                                  "machine %s does not support SAMR connections, but LANMAN password changed are disabled\n",
 188                                  remote_machine);
 189                         cli_shutdown(&cli);
 190                         return False;
 191                 }
 192         }
 193 }