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_samr.h"
  23
  24 /*************************************************************
  25  Change a password on a remote machine using IPC calls.
  26 *************************************************************/
  27
  28 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  29                                 const char *old_passwd, const char *new_passwd,
  30                                 char **err_str)
  31 {
  32         struct nmb_name calling, called;
  33         struct cli_state *cli = NULL;
  34         struct rpc_pipe_client *pipe_hnd = NULL;
  35         struct sockaddr_storage ss;
  36         char *user, *domain, *p;
  37
  38         NTSTATUS result;
  39         bool pass_must_change = False;
  40
  41         user = talloc_strdup(talloc_tos(), user_name);
  42         SMB_ASSERT(user != NULL);
  43         domain = talloc_strdup(talloc_tos(), "");
  44         SMB_ASSERT(domain != NULL);
  45
  46         /* allow usernames of the form domain\\user or domain/user */
  47         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  48             (p = strchr_m(user,*lp_winbind_separator()))) {
  49                 *p = 0;
  50                 domain = user;
  51                 user = p+1;
  52         }
  53
  54         *err_str = NULL;
  55
  56         if(!resolve_name( remote_machine, &ss, 0x20, false)) {
  57                 if (asprintf(err_str, "Unable to find an IP address for machine "
  58                          "%s.\n", remote_machine) == -1) {
  59                         *err_str = NULL;
  60                 }
  61                 return NT_STATUS_UNSUCCESSFUL;
  62         }
  63
  64         cli = cli_initialise();
  65         if (!cli) {
  66                 return NT_STATUS_NO_MEMORY;
  67         }
  68
  69         result = cli_connect(cli, remote_machine, &ss);
  70         if (!NT_STATUS_IS_OK(result)) {
  71                 if (asprintf(err_str, "Unable to connect to SMB server on "
  72                          "machine %s. Error was : %s.\n",
  73                          remote_machine, nt_errstr(result))==-1) {
  74                         *err_str = NULL;
  75                 }
  76                 cli_shutdown(cli);
  77                 return result;
  78         }
  79
  80         make_nmb_name(&calling, global_myname() , 0x0);
  81         make_nmb_name(&called , remote_machine, 0x20);
  82
  83         if (!cli_session_request(cli, &calling, &called)) {
  84                 if (asprintf(err_str, "machine %s rejected the session setup. "
  85                          "Error was : %s.\n",
  86                          remote_machine, cli_errstr(cli)) == -1) {
  87                         *err_str = NULL;
  88                 }
  89                 result = cli_nt_error(cli);
  90                 cli_shutdown(cli);
  91                 return result;
  92         }
  93
  94         cli->protocol = PROTOCOL_NT1;
  95
  96         result = cli_negprot(cli);
  97
  98         if (!NT_STATUS_IS_OK(result)) {
  99                 if (asprintf(err_str, "machine %s rejected the negotiate "
 100                          "protocol. Error was : %s.\n",
 101                          remote_machine, nt_errstr(result)) == -1) {
 102                         *err_str = NULL;
 103                 }
 104                 result = cli_nt_error(cli);
 105                 cli_shutdown(cli);
 106                 return result;
 107         }
 108
 109         /* Given things like SMB signing, restrict anonymous and the like,
 110            try an authenticated connection first */
 111         result = cli_session_setup(cli, user_name,
 112                                    old_passwd, strlen(old_passwd)+1,
 113                                    old_passwd, strlen(old_passwd)+1, "");
 114
 115         if (!NT_STATUS_IS_OK(result)) {
 116
 117                 /* Password must change or Password expired are the only valid
 118                  * error conditions here from where we can proceed, the rest like
 119                  * account locked out or logon failure will lead to errors later
 120                  * anyway */
 121
 122                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 123                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 124                         if (asprintf(err_str, "Could not connect to machine %s: "
 125                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 126                                 *err_str = NULL;
 127                         }
 128                         cli_shutdown(cli);
 129                         return result;
 130                 }
 131
 132                 pass_must_change = True;
 133
 134                 /*
 135                  * We should connect as the anonymous user here, in case
 136                  * the server has "must change password" checked...
 137                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 138                  */
 139
 140                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 141
 142                 if (!NT_STATUS_IS_OK(result)) {
 143                         if (asprintf(err_str, "machine %s rejected the session "
 144                                  "setup. Error was : %s.\n",
 145                                  remote_machine, cli_errstr(cli)) == -1) {
 146                                 *err_str = NULL;
 147                         }
 148                         cli_shutdown(cli);
 149                         return result;
 150                 }
 151
 152                 result = cli_init_creds(cli, "", "", NULL);
 153                 if (!NT_STATUS_IS_OK(result)) {
 154                         cli_shutdown(cli);
 155                         return result;
 156                 }
 157         } else {
 158                 result = cli_init_creds(cli, user, domain, old_passwd);
 159                 if (!NT_STATUS_IS_OK(result)) {
 160                         cli_shutdown(cli);
 161                         return result;
 162                 }
 163         }
 164
 165         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 166         if (!NT_STATUS_IS_OK(result)) {
 167                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 168                              "IPC$ share. Error was : %s.\n",
 169                              remote_machine, nt_errstr(result))) {
 170                         *err_str = NULL;
 171                 }
 172                 cli_shutdown(cli);
 173                 return result;
 174         }
 175
 176         /* Try not to give the password away too easily */
 177
 178         if (!pass_must_change) {
 179                 result = cli_rpc_pipe_open_ntlmssp(cli,
 180                                                    &ndr_table_samr.syntax_id,
 181                                                    NCACN_NP,
 182                                                    DCERPC_AUTH_LEVEL_PRIVACY,
 183                                                    domain, user,
 184                                                    old_passwd,
 185                                                    &pipe_hnd);
 186         } else {
 187                 /*
 188                  * If the user password must be changed the ntlmssp bind will
 189                  * fail the same way as the session setup above did. The
 190                  * difference ist that with a pipe bind we don't get a good
 191                  * error message, the result will be that the rpc call below
 192                  * will just fail. So we do it anonymously, there's no other
 193                  * way.
 194                  */
 195                 result = cli_rpc_pipe_open_noauth(
 196                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 197         }
 198
 199         if (!NT_STATUS_IS_OK(result)) {
 200                 if (lp_client_lanman_auth()) {
 201                         /* Use the old RAP method. */
 202                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 203                                 if (asprintf(err_str, "machine %s rejected the "
 204                                          "password change: Error was : %s.\n",
 205                                          remote_machine, cli_errstr(cli)) == -1) {
 206                                         *err_str = NULL;
 207                                 }
 208                                 result = cli_nt_error(cli);
 209                                 cli_shutdown(cli);
 210                                 return result;
 211                         }
 212                 } else {
 213                         if (asprintf(err_str, "SAMR connection to machine %s "
 214                                  "failed. Error was %s, but LANMAN password "
 215                                  "changes are disabled\n",
 216                                  remote_machine, nt_errstr(result)) == -1) {
 217                                 *err_str = NULL;
 218                         }
 219                         result = cli_nt_error(cli);
 220                         cli_shutdown(cli);
 221                         return result;
 222                 }
 223         }
 224
 225         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 226                                              user_name, new_passwd, old_passwd);
 227         if (NT_STATUS_IS_OK(result)) {
 228                 /* Great - it all worked! */
 229                 cli_shutdown(cli);
 230                 return NT_STATUS_OK;
 231
 232         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 233                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 234                 /* it failed, but for reasons such as wrong password, too short etc ... */
 235
 236                 if (asprintf(err_str, "machine %s rejected the password change: "
 237                          "Error was : %s.\n",
 238                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 239                         *err_str = NULL;
 240                 }
 241                 cli_shutdown(cli);
 242                 return result;
 243         }
 244
 245         /* OK, that failed, so try again... */
 246         TALLOC_FREE(pipe_hnd);
 247
 248         /* Try anonymous NTLMSSP... */
 249         result = cli_init_creds(cli, "", "", NULL);
 250         if (!NT_STATUS_IS_OK(result)) {
 251                 cli_shutdown(cli);
 252                 return result;
 253         }
 254
 255         result = NT_STATUS_UNSUCCESSFUL;
 256
 257         /* OK, this is ugly, but... try an anonymous pipe. */
 258         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 259                                           &pipe_hnd);
 260
 261         if ( NT_STATUS_IS_OK(result) &&
 262                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 263                                          pipe_hnd, talloc_tos(), user_name,
 264                                          new_passwd, old_passwd)))) {
 265                 /* Great - it all worked! */
 266                 cli_shutdown(cli);
 267                 return NT_STATUS_OK;
 268         } else {
 269                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 270                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 271                         /* it failed, but again it was due to things like new password too short */
 272
 273                         if (asprintf(err_str, "machine %s rejected the "
 274                                  "(anonymous) password change: Error was : "
 275                                  "%s.\n", remote_machine,
 276                                  get_friendly_nt_error_msg(result)) == -1) {
 277                                 *err_str = NULL;
 278                         }
 279                         cli_shutdown(cli);
 280                         return result;
 281                 }
 282
 283                 /* We have failed to change the user's password, and we think the server
 284                    just might not support SAMR password changes, so fall back */
 285
 286                 if (lp_client_lanman_auth()) {
 287                         /* Use the old RAP method. */
 288                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 289                                 /* SAMR failed, but the old LanMan protocol worked! */
 290
 291                                 cli_shutdown(cli);
 292                                 return NT_STATUS_OK;
 293                         }
 294                         if (asprintf(err_str, "machine %s rejected the password "
 295                                  "change: Error was : %s.\n",
 296                                  remote_machine, cli_errstr(cli)) == -1) {
 297                                 *err_str = NULL;
 298                         }
 299                         result = cli_nt_error(cli);
 300                         cli_shutdown(cli);
 301                         return result;
 302                 } else {
 303                         if (asprintf(err_str, "SAMR connection to machine %s "
 304                                  "failed. Error was %s, but LANMAN password "
 305                                  "changes are disabled\n",
 306                                 nt_errstr(result), remote_machine) == -1) {
 307                                 *err_str = NULL;
 308                         }
 309                         cli_shutdown(cli);
 310                         return NT_STATUS_UNSUCCESSFUL;
 311                 }
 312         }
 313 }