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