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/clirap.h"
  25
  26 /*************************************************************
  27  Change a password on a remote machine using IPC calls.
  28 *************************************************************/
  29
  30 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  31                                 const char *old_passwd, const char *new_passwd,
  32                                 char **err_str)
  33 {
  34         struct nmb_name calling, called;
  35         struct cli_state *cli = NULL;
  36         struct rpc_pipe_client *pipe_hnd = NULL;
  37         struct sockaddr_storage ss;
  38         char *user, *domain, *p;
  39
  40         NTSTATUS result;
  41         bool pass_must_change = False;
  42
  43         user = talloc_strdup(talloc_tos(), user_name);
  44         SMB_ASSERT(user != NULL);
  45         domain = talloc_strdup(talloc_tos(), "");
  46         SMB_ASSERT(domain != NULL);
  47
  48         /* allow usernames of the form domain\\user or domain/user */
  49         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  50             (p = strchr_m(user,*lp_winbind_separator()))) {
  51                 *p = 0;
  52                 domain = user;
  53                 user = p+1;
  54         }
  55
  56         *err_str = NULL;
  57
  58         if(!resolve_name( remote_machine, &ss, 0x20, false)) {
  59                 if (asprintf(err_str, "Unable to find an IP address for machine "
  60                          "%s.\n", remote_machine) == -1) {
  61                         *err_str = NULL;
  62                 }
  63                 return NT_STATUS_UNSUCCESSFUL;
  64         }
  65
  66         cli = cli_initialise();
  67         if (!cli) {
  68                 return NT_STATUS_NO_MEMORY;
  69         }
  70
  71         result = cli_connect(cli, remote_machine, &ss);
  72         if (!NT_STATUS_IS_OK(result)) {
  73                 if (asprintf(err_str, "Unable to connect to SMB server on "
  74                          "machine %s. Error was : %s.\n",
  75                          remote_machine, nt_errstr(result))==-1) {
  76                         *err_str = NULL;
  77                 }
  78                 cli_shutdown(cli);
  79                 return result;
  80         }
  81
  82         make_nmb_name(&calling, global_myname() , 0x0);
  83         make_nmb_name(&called , remote_machine, 0x20);
  84
  85         if (!cli_session_request(cli, &calling, &called)) {
  86                 if (asprintf(err_str, "machine %s rejected the session setup. "
  87                          "Error was : %s.\n",
  88                          remote_machine, cli_errstr(cli)) == -1) {
  89                         *err_str = NULL;
  90                 }
  91                 result = cli_nt_error(cli);
  92                 cli_shutdown(cli);
  93                 return result;
  94         }
  95
  96         cli->protocol = PROTOCOL_NT1;
  97
  98         result = cli_negprot(cli);
  99
 100         if (!NT_STATUS_IS_OK(result)) {
 101                 if (asprintf(err_str, "machine %s rejected the negotiate "
 102                          "protocol. Error was : %s.\n",
 103                          remote_machine, nt_errstr(result)) == -1) {
 104                         *err_str = NULL;
 105                 }
 106                 result = cli_nt_error(cli);
 107                 cli_shutdown(cli);
 108                 return result;
 109         }
 110
 111         /* Given things like SMB signing, restrict anonymous and the like,
 112            try an authenticated connection first */
 113         result = cli_session_setup(cli, user_name,
 114                                    old_passwd, strlen(old_passwd)+1,
 115                                    old_passwd, strlen(old_passwd)+1, "");
 116
 117         if (!NT_STATUS_IS_OK(result)) {
 118
 119                 /* Password must change or Password expired are the only valid
 120                  * error conditions here from where we can proceed, the rest like
 121                  * account locked out or logon failure will lead to errors later
 122                  * anyway */
 123
 124                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 125                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 126                         if (asprintf(err_str, "Could not connect to machine %s: "
 127                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 128                                 *err_str = NULL;
 129                         }
 130                         cli_shutdown(cli);
 131                         return result;
 132                 }
 133
 134                 pass_must_change = True;
 135
 136                 /*
 137                  * We should connect as the anonymous user here, in case
 138                  * the server has "must change password" checked...
 139                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 140                  */
 141
 142                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 143
 144                 if (!NT_STATUS_IS_OK(result)) {
 145                         if (asprintf(err_str, "machine %s rejected the session "
 146                                  "setup. Error was : %s.\n",
 147                                  remote_machine, cli_errstr(cli)) == -1) {
 148                                 *err_str = NULL;
 149                         }
 150                         cli_shutdown(cli);
 151                         return result;
 152                 }
 153
 154                 result = cli_init_creds(cli, "", "", NULL);
 155                 if (!NT_STATUS_IS_OK(result)) {
 156                         cli_shutdown(cli);
 157                         return result;
 158                 }
 159         } else {
 160                 result = cli_init_creds(cli, user, domain, old_passwd);
 161                 if (!NT_STATUS_IS_OK(result)) {
 162                         cli_shutdown(cli);
 163                         return result;
 164                 }
 165         }
 166
 167         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 168         if (!NT_STATUS_IS_OK(result)) {
 169                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 170                              "IPC$ share. Error was : %s.\n",
 171                              remote_machine, nt_errstr(result))) {
 172                         *err_str = NULL;
 173                 }
 174                 cli_shutdown(cli);
 175                 return result;
 176         }
 177
 178         /* Try not to give the password away too easily */
 179
 180         if (!pass_must_change) {
 181                 result = cli_rpc_pipe_open_ntlmssp(cli,
 182                                                    &ndr_table_samr.syntax_id,
 183                                                    NCACN_NP,
 184                                                    DCERPC_AUTH_LEVEL_PRIVACY,
 185                                                    domain, user,
 186                                                    old_passwd,
 187                                                    &pipe_hnd);
 188         } else {
 189                 /*
 190                  * If the user password must be changed the ntlmssp bind will
 191                  * fail the same way as the session setup above did. The
 192                  * difference ist that with a pipe bind we don't get a good
 193                  * error message, the result will be that the rpc call below
 194                  * will just fail. So we do it anonymously, there's no other
 195                  * way.
 196                  */
 197                 result = cli_rpc_pipe_open_noauth(
 198                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 199         }
 200
 201         if (!NT_STATUS_IS_OK(result)) {
 202                 if (lp_client_lanman_auth()) {
 203                         /* Use the old RAP method. */
 204                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 205                                 if (asprintf(err_str, "machine %s rejected the "
 206                                          "password change: Error was : %s.\n",
 207                                          remote_machine, cli_errstr(cli)) == -1) {
 208                                         *err_str = NULL;
 209                                 }
 210                                 result = cli_nt_error(cli);
 211                                 cli_shutdown(cli);
 212                                 return result;
 213                         }
 214                 } else {
 215                         if (asprintf(err_str, "SAMR connection to machine %s "
 216                                  "failed. Error was %s, but LANMAN password "
 217                                  "changes are disabled\n",
 218                                  remote_machine, nt_errstr(result)) == -1) {
 219                                 *err_str = NULL;
 220                         }
 221                         result = cli_nt_error(cli);
 222                         cli_shutdown(cli);
 223                         return result;
 224                 }
 225         }
 226
 227         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 228                                              user_name, new_passwd, old_passwd);
 229         if (NT_STATUS_IS_OK(result)) {
 230                 /* Great - it all worked! */
 231                 cli_shutdown(cli);
 232                 return NT_STATUS_OK;
 233
 234         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 235                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 236                 /* it failed, but for reasons such as wrong password, too short etc ... */
 237
 238                 if (asprintf(err_str, "machine %s rejected the password change: "
 239                          "Error was : %s.\n",
 240                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 241                         *err_str = NULL;
 242                 }
 243                 cli_shutdown(cli);
 244                 return result;
 245         }
 246
 247         /* OK, that failed, so try again... */
 248         TALLOC_FREE(pipe_hnd);
 249
 250         /* Try anonymous NTLMSSP... */
 251         result = cli_init_creds(cli, "", "", NULL);
 252         if (!NT_STATUS_IS_OK(result)) {
 253                 cli_shutdown(cli);
 254                 return result;
 255         }
 256
 257         result = NT_STATUS_UNSUCCESSFUL;
 258
 259         /* OK, this is ugly, but... try an anonymous pipe. */
 260         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 261                                           &pipe_hnd);
 262
 263         if ( NT_STATUS_IS_OK(result) &&
 264                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 265                                          pipe_hnd, talloc_tos(), user_name,
 266                                          new_passwd, old_passwd)))) {
 267                 /* Great - it all worked! */
 268                 cli_shutdown(cli);
 269                 return NT_STATUS_OK;
 270         } else {
 271                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 272                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 273                         /* it failed, but again it was due to things like new password too short */
 274
 275                         if (asprintf(err_str, "machine %s rejected the "
 276                                  "(anonymous) password change: Error was : "
 277                                  "%s.\n", remote_machine,
 278                                  get_friendly_nt_error_msg(result)) == -1) {
 279                                 *err_str = NULL;
 280                         }
 281                         cli_shutdown(cli);
 282                         return result;
 283                 }
 284
 285                 /* We have failed to change the user's password, and we think the server
 286                    just might not support SAMR password changes, so fall back */
 287
 288                 if (lp_client_lanman_auth()) {
 289                         /* Use the old RAP method. */
 290                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 291                                 /* SAMR failed, but the old LanMan protocol worked! */
 292
 293                                 cli_shutdown(cli);
 294                                 return NT_STATUS_OK;
 295                         }
 296                         if (asprintf(err_str, "machine %s rejected the password "
 297                                  "change: Error was : %s.\n",
 298                                  remote_machine, cli_errstr(cli)) == -1) {
 299                                 *err_str = NULL;
 300                         }
 301                         result = cli_nt_error(cli);
 302                         cli_shutdown(cli);
 303                         return result;
 304                 } else {
 305                         if (asprintf(err_str, "SAMR connection to machine %s "
 306                                  "failed. Error was %s, but LANMAN password "
 307                                  "changes are disabled\n",
 308                                 nt_errstr(result), remote_machine) == -1) {
 309                                 *err_str = NULL;
 310                         }
 311                         cli_shutdown(cli);
 312                         return NT_STATUS_UNSUCCESSFUL;
 313                 }
 314         }
 315 }