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