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
  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)
  29 {
  30         struct nmb_name calling, called;
  31         struct cli_state *cli;
  32         struct rpc_pipe_client *pipe_hnd;
  33         struct sockaddr_storage ss;
  34
  35         NTSTATUS result;
  36         bool pass_must_change = False;
  37
  38         *err_str = NULL;
  39
  40         if(!resolve_name( remote_machine, &ss, 0x20)) {
  41                 if (asprintf(err_str, "Unable to find an IP address for machine "
  42                          "%s.\n", remote_machine) == -1) {
  43                         *err_str = NULL;
  44                 }
  45                 return NT_STATUS_UNSUCCESSFUL;
  46         }
  47
  48         cli = cli_initialise();
  49         if (!cli) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         result = cli_connect(cli, remote_machine, &ss);
  54         if (!NT_STATUS_IS_OK(result)) {
  55                 if (asprintf(err_str, "Unable to connect to SMB server on "
  56                          "machine %s. Error was : %s.\n",
  57                          remote_machine, nt_errstr(result))==-1) {
  58                         *err_str = NULL;
  59                 }
  60                 cli_shutdown(cli);
  61                 return result;
  62         }
  63
  64         make_nmb_name(&calling, global_myname() , 0x0);
  65         make_nmb_name(&called , remote_machine, 0x20);
  66
  67         if (!cli_session_request(cli, &calling, &called)) {
  68                 if (asprintf(err_str, "machine %s rejected the session setup. "
  69                          "Error was : %s.\n",
  70                          remote_machine, cli_errstr(cli)) == -1) {
  71                         *err_str = NULL;
  72                 }
  73                 result = cli_nt_error(cli);
  74                 cli_shutdown(cli);
  75                 return result;
  76         }
  77
  78         cli->protocol = PROTOCOL_NT1;
  79
  80         result = cli_negprot(cli);
  81
  82         if (!NT_STATUS_IS_OK(result)) {
  83                 if (asprintf(err_str, "machine %s rejected the negotiate "
  84                          "protocol. Error was : %s.\n",
  85                          remote_machine, nt_errstr(result)) == -1) {
  86                         *err_str = NULL;
  87                 }
  88                 result = cli_nt_error(cli);
  89                 cli_shutdown(cli);
  90                 return result;
  91         }
  92
  93         /* Given things like SMB signing, restrict anonymous and the like,
  94            try an authenticated connection first */
  95         result = cli_session_setup(cli, user_name,
  96                                    old_passwd, strlen(old_passwd)+1,
  97                                    old_passwd, strlen(old_passwd)+1, "");
  98
  99         if (!NT_STATUS_IS_OK(result)) {
 100
 101                 /* Password must change or Password expired are the only valid
 102                  * error conditions here from where we can proceed, the rest like
 103                  * account locked out or logon failure will lead to errors later
 104                  * anyway */
 105
 106                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 107                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 108                         if (asprintf(err_str, "Could not connect to machine %s: "
 109                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 110                                 *err_str = NULL;
 111                         }
 112                         cli_shutdown(cli);
 113                         return result;
 114                 }
 115
 116                 pass_must_change = True;
 117
 118                 /*
 119                  * We should connect as the anonymous user here, in case
 120                  * the server has "must change password" checked...
 121                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 122                  */
 123
 124                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 125
 126                 if (!NT_STATUS_IS_OK(result)) {
 127                         if (asprintf(err_str, "machine %s rejected the session "
 128                                  "setup. Error was : %s.\n",
 129                                  remote_machine, cli_errstr(cli)) == -1) {
 130                                 *err_str = NULL;
 131                         }
 132                         cli_shutdown(cli);
 133                         return result;
 134                 }
 135
 136                 result = cli_init_creds(cli, "", "", NULL);
 137                 if (!NT_STATUS_IS_OK(result)) {
 138                         cli_shutdown(cli);
 139                         return result;
 140                 }
 141         } else {
 142                 result = cli_init_creds(cli, user_name, "", old_passwd);
 143                 if (!NT_STATUS_IS_OK(result)) {
 144                         cli_shutdown(cli);
 145                         return result;
 146                 }
 147         }
 148
 149         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 150         if (!NT_STATUS_IS_OK(result)) {
 151                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 152                              "IPC$ share. Error was : %s.\n",
 153                              remote_machine, nt_errstr(result))) {
 154                         *err_str = NULL;
 155                 }
 156                 cli_shutdown(cli);
 157                 return result;
 158         }
 159
 160         /* Try not to give the password away too easily */
 161
 162         if (!pass_must_change) {
 163                 result = cli_rpc_pipe_open_ntlmssp(cli,
 164                                                    &ndr_table_samr.syntax_id,
 165                                                    PIPE_AUTH_LEVEL_PRIVACY,
 166                                                    "", /* what domain... ? */
 167                                                    user_name,
 168                                                    old_passwd,
 169                                                    &pipe_hnd);
 170         } else {
 171                 /*
 172                  * If the user password must be changed the ntlmssp bind will
 173                  * fail the same way as the session setup above did. The
 174                  * difference ist that with a pipe bind we don't get a good
 175                  * error message, the result will be that the rpc call below
 176                  * will just fail. So we do it anonymously, there's no other
 177                  * way.
 178                  */
 179                 result = cli_rpc_pipe_open_noauth(
 180                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 181         }
 182
 183         if (!NT_STATUS_IS_OK(result)) {
 184                 if (lp_client_lanman_auth()) {
 185                         /* Use the old RAP method. */
 186                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 187                                 if (asprintf(err_str, "machine %s rejected the "
 188                                          "password change: Error was : %s.\n",
 189                                          remote_machine, cli_errstr(cli)) == -1) {
 190                                         *err_str = NULL;
 191                                 }
 192                                 result = cli_nt_error(cli);
 193                                 cli_shutdown(cli);
 194                                 return result;
 195                         }
 196                 } else {
 197                         if (asprintf(err_str, "SAMR connection to machine %s "
 198                                  "failed. Error was %s, but LANMAN password "
 199                                  "changes are disabled\n",
 200                                  remote_machine, nt_errstr(result)) == -1) {
 201                                 *err_str = NULL;
 202                         }
 203                         result = cli_nt_error(cli);
 204                         cli_shutdown(cli);
 205                         return result;
 206                 }
 207         }
 208
 209         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 210                                              user_name, new_passwd, old_passwd);
 211         if (NT_STATUS_IS_OK(result)) {
 212                 /* Great - it all worked! */
 213                 cli_shutdown(cli);
 214                 return NT_STATUS_OK;
 215
 216         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 217                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 218                 /* it failed, but for reasons such as wrong password, too short etc ... */
 219
 220                 if (asprintf(err_str, "machine %s rejected the password change: "
 221                          "Error was : %s.\n",
 222                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 223                         *err_str = NULL;
 224                 }
 225                 cli_shutdown(cli);
 226                 return result;
 227         }
 228
 229         /* OK, that failed, so try again... */
 230         TALLOC_FREE(pipe_hnd);
 231
 232         /* Try anonymous NTLMSSP... */
 233         result = cli_init_creds(cli, "", "", NULL);
 234         if (!NT_STATUS_IS_OK(result)) {
 235                 cli_shutdown(cli);
 236                 return result;
 237         }
 238
 239         result = NT_STATUS_UNSUCCESSFUL;
 240
 241         /* OK, this is ugly, but... try an anonymous pipe. */
 242         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 243                                           &pipe_hnd);
 244
 245         if ( NT_STATUS_IS_OK(result) &&
 246                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 247                                          pipe_hnd, talloc_tos(), user_name,
 248                                          new_passwd, old_passwd)))) {
 249                 /* Great - it all worked! */
 250                 cli_shutdown(cli);
 251                 return NT_STATUS_OK;
 252         } else {
 253                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 254                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 255                         /* it failed, but again it was due to things like new password too short */
 256
 257                         if (asprintf(err_str, "machine %s rejected the "
 258                                  "(anonymous) password change: Error was : "
 259                                  "%s.\n", remote_machine,
 260                                  get_friendly_nt_error_msg(result)) == -1) {
 261                                 *err_str = NULL;
 262                         }
 263                         cli_shutdown(cli);
 264                         return result;
 265                 }
 266
 267                 /* We have failed to change the user's password, and we think the server
 268                    just might not support SAMR password changes, so fall back */
 269
 270                 if (lp_client_lanman_auth()) {
 271                         /* Use the old RAP method. */
 272                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 273                                 /* SAMR failed, but the old LanMan protocol worked! */
 274
 275                                 cli_shutdown(cli);
 276                                 return NT_STATUS_OK;
 277                         }
 278                         if (asprintf(err_str, "machine %s rejected the password "
 279                                  "change: Error was : %s.\n",
 280                                  remote_machine, cli_errstr(cli)) == -1) {
 281                                 *err_str = NULL;
 282                         }
 283                         result = cli_nt_error(cli);
 284                         cli_shutdown(cli);
 285                         return result;
 286                 } else {
 287                         if (asprintf(err_str, "SAMR connection to machine %s "
 288                                  "failed. Error was %s, but LANMAN password "
 289                                  "changed are disabled\n",
 290                                 nt_errstr(result), remote_machine) == -1) {
 291                                 *err_str = NULL;
 292                         }
 293                         cli_shutdown(cli);
 294                         return NT_STATUS_UNSUCCESSFUL;
 295                 }
 296         }
 297 }