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
  28 /*************************************************************
  29  Change a password on a remote machine using IPC calls.
  30 *************************************************************/
  31
  32 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  33                                 const char *old_passwd, const char *new_passwd,
  34                                 char **err_str)
  35 {
  36         struct nmb_name calling, called;
  37         struct cli_state *cli = NULL;
  38         struct rpc_pipe_client *pipe_hnd = NULL;
  39         struct sockaddr_storage ss;
  40         char *user, *domain, *p;
  41
  42         NTSTATUS result;
  43         bool pass_must_change = False;
  44
  45         user = talloc_strdup(talloc_tos(), user_name);
  46         SMB_ASSERT(user != NULL);
  47         domain = talloc_strdup(talloc_tos(), "");
  48         SMB_ASSERT(domain != NULL);
  49
  50         /* allow usernames of the form domain\\user or domain/user */
  51         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  52             (p = strchr_m(user,*lp_winbind_separator()))) {
  53                 *p = 0;
  54                 domain = user;
  55                 user = p+1;
  56         }
  57
  58         *err_str = NULL;
  59
  60         if(!resolve_name( remote_machine, &ss, 0x20, false)) {
  61                 if (asprintf(err_str, "Unable to find an IP address for machine "
  62                          "%s.\n", remote_machine) == -1) {
  63                         *err_str = NULL;
  64                 }
  65                 return NT_STATUS_UNSUCCESSFUL;
  66         }
  67
  68         cli = cli_initialise();
  69         if (!cli) {
  70                 return NT_STATUS_NO_MEMORY;
  71         }
  72
  73         result = cli_connect(cli, remote_machine, &ss);
  74         if (!NT_STATUS_IS_OK(result)) {
  75                 if (asprintf(err_str, "Unable to connect to SMB server on "
  76                          "machine %s. Error was : %s.\n",
  77                          remote_machine, nt_errstr(result))==-1) {
  78                         *err_str = NULL;
  79                 }
  80                 cli_shutdown(cli);
  81                 return result;
  82         }
  83
  84         make_nmb_name(&calling, global_myname() , 0x0);
  85         make_nmb_name(&called , remote_machine, 0x20);
  86
  87         if (!cli_session_request(cli, &calling, &called)) {
  88                 if (asprintf(err_str, "machine %s rejected the session setup. "
  89                          "Error was : %s.\n",
  90                          remote_machine, cli_errstr(cli)) == -1) {
  91                         *err_str = NULL;
  92                 }
  93                 result = cli_nt_error(cli);
  94                 cli_shutdown(cli);
  95                 return result;
  96         }
  97
  98         cli->protocol = PROTOCOL_NT1;
  99
 100         result = cli_negprot(cli);
 101
 102         if (!NT_STATUS_IS_OK(result)) {
 103                 if (asprintf(err_str, "machine %s rejected the negotiate "
 104                          "protocol. Error was : %s.\n",
 105                          remote_machine, nt_errstr(result)) == -1) {
 106                         *err_str = NULL;
 107                 }
 108                 result = cli_nt_error(cli);
 109                 cli_shutdown(cli);
 110                 return result;
 111         }
 112
 113         /* Given things like SMB signing, restrict anonymous and the like,
 114            try an authenticated connection first */
 115         result = cli_session_setup(cli, user_name,
 116                                    old_passwd, strlen(old_passwd)+1,
 117                                    old_passwd, strlen(old_passwd)+1, "");
 118
 119         if (!NT_STATUS_IS_OK(result)) {
 120
 121                 /* Password must change or Password expired are the only valid
 122                  * error conditions here from where we can proceed, the rest like
 123                  * account locked out or logon failure will lead to errors later
 124                  * anyway */
 125
 126                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 127                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 128                         if (asprintf(err_str, "Could not connect to machine %s: "
 129                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 130                                 *err_str = NULL;
 131                         }
 132                         cli_shutdown(cli);
 133                         return result;
 134                 }
 135
 136                 pass_must_change = True;
 137
 138                 /*
 139                  * We should connect as the anonymous user here, in case
 140                  * the server has "must change password" checked...
 141                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 142                  */
 143
 144                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 145
 146                 if (!NT_STATUS_IS_OK(result)) {
 147                         if (asprintf(err_str, "machine %s rejected the session "
 148                                  "setup. Error was : %s.\n",
 149                                  remote_machine, cli_errstr(cli)) == -1) {
 150                                 *err_str = NULL;
 151                         }
 152                         cli_shutdown(cli);
 153                         return result;
 154                 }
 155
 156                 result = cli_init_creds(cli, "", "", NULL);
 157                 if (!NT_STATUS_IS_OK(result)) {
 158                         cli_shutdown(cli);
 159                         return result;
 160                 }
 161         } else {
 162                 result = cli_init_creds(cli, user, domain, old_passwd);
 163                 if (!NT_STATUS_IS_OK(result)) {
 164                         cli_shutdown(cli);
 165                         return result;
 166                 }
 167         }
 168
 169         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 170         if (!NT_STATUS_IS_OK(result)) {
 171                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 172                              "IPC$ share. Error was : %s.\n",
 173                              remote_machine, nt_errstr(result))) {
 174                         *err_str = NULL;
 175                 }
 176                 cli_shutdown(cli);
 177                 return result;
 178         }
 179
 180         /* Try not to give the password away too easily */
 181
 182         if (!pass_must_change) {
 183                 result = cli_rpc_pipe_open_ntlmssp(cli,
 184                                                    &ndr_table_samr.syntax_id,
 185                                                    NCACN_NP,
 186                                                    DCERPC_AUTH_LEVEL_PRIVACY,
 187                                                    domain, user,
 188                                                    old_passwd,
 189                                                    &pipe_hnd);
 190         } else {
 191                 /*
 192                  * If the user password must be changed the ntlmssp bind will
 193                  * fail the same way as the session setup above did. The
 194                  * difference ist that with a pipe bind we don't get a good
 195                  * error message, the result will be that the rpc call below
 196                  * will just fail. So we do it anonymously, there's no other
 197                  * way.
 198                  */
 199                 result = cli_rpc_pipe_open_noauth(
 200                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 201         }
 202
 203         if (!NT_STATUS_IS_OK(result)) {
 204                 if (lp_client_lanman_auth()) {
 205                         /* Use the old RAP method. */
 206                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 207                                 if (asprintf(err_str, "machine %s rejected the "
 208                                          "password change: Error was : %s.\n",
 209                                          remote_machine, cli_errstr(cli)) == -1) {
 210                                         *err_str = NULL;
 211                                 }
 212                                 result = cli_nt_error(cli);
 213                                 cli_shutdown(cli);
 214                                 return result;
 215                         }
 216                 } else {
 217                         if (asprintf(err_str, "SAMR connection to machine %s "
 218                                  "failed. Error was %s, but LANMAN password "
 219                                  "changes are disabled\n",
 220                                  remote_machine, nt_errstr(result)) == -1) {
 221                                 *err_str = NULL;
 222                         }
 223                         result = cli_nt_error(cli);
 224                         cli_shutdown(cli);
 225                         return result;
 226                 }
 227         }
 228
 229         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 230                                              user_name, new_passwd, old_passwd);
 231         if (NT_STATUS_IS_OK(result)) {
 232                 /* Great - it all worked! */
 233                 cli_shutdown(cli);
 234                 return NT_STATUS_OK;
 235
 236         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 237                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 238                 /* it failed, but for reasons such as wrong password, too short etc ... */
 239
 240                 if (asprintf(err_str, "machine %s rejected the password change: "
 241                          "Error was : %s.\n",
 242                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 243                         *err_str = NULL;
 244                 }
 245                 cli_shutdown(cli);
 246                 return result;
 247         }
 248
 249         /* OK, that failed, so try again... */
 250         TALLOC_FREE(pipe_hnd);
 251
 252         /* Try anonymous NTLMSSP... */
 253         result = cli_init_creds(cli, "", "", NULL);
 254         if (!NT_STATUS_IS_OK(result)) {
 255                 cli_shutdown(cli);
 256                 return result;
 257         }
 258
 259         result = NT_STATUS_UNSUCCESSFUL;
 260
 261         /* OK, this is ugly, but... try an anonymous pipe. */
 262         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 263                                           &pipe_hnd);
 264
 265         if ( NT_STATUS_IS_OK(result) &&
 266                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 267                                          pipe_hnd, talloc_tos(), user_name,
 268                                          new_passwd, old_passwd)))) {
 269                 /* Great - it all worked! */
 270                 cli_shutdown(cli);
 271                 return NT_STATUS_OK;
 272         } else {
 273                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 274                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 275                         /* it failed, but again it was due to things like new password too short */
 276
 277                         if (asprintf(err_str, "machine %s rejected the "
 278                                  "(anonymous) password change: Error was : "
 279                                  "%s.\n", remote_machine,
 280                                  get_friendly_nt_error_msg(result)) == -1) {
 281                                 *err_str = NULL;
 282                         }
 283                         cli_shutdown(cli);
 284                         return result;
 285                 }
 286
 287                 /* We have failed to change the user's password, and we think the server
 288                    just might not support SAMR password changes, so fall back */
 289
 290                 if (lp_client_lanman_auth()) {
 291                         /* Use the old RAP method. */
 292                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 293                                 /* SAMR failed, but the old LanMan protocol worked! */
 294
 295                                 cli_shutdown(cli);
 296                                 return NT_STATUS_OK;
 297                         }
 298                         if (asprintf(err_str, "machine %s rejected the password "
 299                                  "change: Error was : %s.\n",
 300                                  remote_machine, cli_errstr(cli)) == -1) {
 301                                 *err_str = NULL;
 302                         }
 303                         result = cli_nt_error(cli);
 304                         cli_shutdown(cli);
 305                         return result;
 306                 } else {
 307                         if (asprintf(err_str, "SAMR connection to machine %s "
 308                                  "failed. Error was %s, but LANMAN password "
 309                                  "changes are disabled\n",
 310                                 nt_errstr(result), remote_machine) == -1) {
 311                                 *err_str = NULL;
 312                         }
 313                         cli_shutdown(cli);
 314                         return NT_STATUS_UNSUCCESSFUL;
 315                 }
 316         }
 317 }