source4/auth/ntlm/auth_winbind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind authentication mechnism
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Andrew Bartlett 2001 - 2002
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include <tevent.h>
  26 #include "../lib/util/tevent_ntstatus.h"
  27 #include "auth/auth.h"
  28 #include "auth/ntlm/auth_proto.h"
  29 #include "librpc/gen_ndr/ndr_winbind_c.h"
  30 #include "lib/messaging/irpc.h"
  31 #include "param/param.h"
  32 #include "nsswitch/libwbclient/wbclient.h"
  33 #include "auth/auth_sam_reply.h"
  34 #include "libcli/security/security.h"
  35 #include "dsdb/samdb/samdb.h"
  36 #include "auth/auth_sam.h"
  37
  38 _PUBLIC_ NTSTATUS auth4_winbind_init(TALLOC_CTX *);
  39
  40 static NTSTATUS winbind_want_check(struct auth_method_context *ctx,
  41                                    TALLOC_CTX *mem_ctx,
  42                                    const struct auth_usersupplied_info *user_info)
  43 {
  44         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
  45                 return NT_STATUS_NOT_IMPLEMENTED;
  46         }
  47
  48         /* TODO: maybe limit the user scope to remote users only */
  49         return NT_STATUS_OK;
  50 }
  51
  52 struct winbind_check_password_state {
  53         struct auth_method_context *ctx;
  54         const struct auth_usersupplied_info *user_info;
  55         struct winbind_SamLogon req;
  56         struct auth_user_info_dc *user_info_dc;
  57         bool authoritative;
  58 };
  59
  60 static void winbind_check_password_done(struct tevent_req *subreq);
  61
  62 /*
  63  Authenticate a user with a challenge/response
  64  using IRPC to the winbind task
  65 */
  66 static struct tevent_req *winbind_check_password_send(TALLOC_CTX *mem_ctx,
  67                                 struct tevent_context *ev,
  68                                 struct auth_method_context *ctx,
  69                                 const struct auth_usersupplied_info *user_info)
  70 {
  71         struct tevent_req *req = NULL;
  72         struct winbind_check_password_state *state = NULL;
  73         NTSTATUS status;
  74         struct dcerpc_binding_handle *irpc_handle;
  75         const struct auth_usersupplied_info *user_info_new;
  76         struct netr_IdentityInfo *identity_info;
  77         struct imessaging_context *msg_ctx;
  78         struct tevent_req *subreq = NULL;
  79
  80         req = tevent_req_create(mem_ctx, &state,
  81                                 struct winbind_check_password_state);
  82         if (req == NULL) {
  83                 return NULL;
  84         }
  85         state->ctx = ctx;
  86         state->user_info = user_info;
  87         state->authoritative = true;
  88
  89         msg_ctx = imessaging_client_init(state, ctx->auth_ctx->lp_ctx, ev);
  90         if (msg_ctx == NULL) {
  91                 DEBUG(1, ("imessaging_init failed\n"));
  92                 tevent_req_nterror(req, NT_STATUS_INVALID_SERVER_STATE);
  93                 return tevent_req_post(req, ev);
  94         }
  95
  96         irpc_handle = irpc_binding_handle_by_name(state, msg_ctx,
  97                                                   "winbind_server",
  98                                                   &ndr_table_winbind);
  99         if (irpc_handle == NULL) {
 100                 DEBUG(0, ("Winbind authentication for [%s]\\[%s] failed, "
 101                           "no winbind_server running!\n",
 102                           user_info->client.domain_name, user_info->client.account_name));
 103                 tevent_req_nterror(req, NT_STATUS_NO_LOGON_SERVERS);
 104                 return tevent_req_post(req, ev);
 105         }
 106
 107         /*
 108          * 120 seconds should be enough even for trusted domains.
 109          *
 110          * Currently winbindd has a much lower limit.
 111          * And tests with Windows RODCs show that it
 112          * returns NO_LOGON_SERVERS after 90-100 seconds
 113          * if it can't reach any RWDC.
 114          */
 115         dcerpc_binding_handle_set_timeout(irpc_handle, 120);
 116
 117         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 118                 struct netr_PasswordInfo *password_info;
 119
 120                 status = encrypt_user_info(state, ctx->auth_ctx, AUTH_PASSWORD_HASH,
 121                                            user_info, &user_info_new);
 122                 if (tevent_req_nterror(req, status)) {
 123                         return tevent_req_post(req, ev);
 124                 }
 125                 user_info = user_info_new;
 126
 127                 password_info = talloc_zero(state, struct netr_PasswordInfo);
 128                 if (tevent_req_nomem(password_info, req)) {
 129                         return tevent_req_post(req, ev);
 130                 }
 131
 132                 password_info->lmpassword = *user_info->password.hash.lanman;
 133                 password_info->ntpassword = *user_info->password.hash.nt;
 134
 135                 identity_info = &password_info->identity_info;
 136                 state->req.in.logon_level       = 1;
 137                 state->req.in.logon.password= password_info;
 138         } else {
 139                 struct netr_NetworkInfo *network_info;
 140                 uint8_t chal[8];
 141
 142                 status = encrypt_user_info(state, ctx->auth_ctx, AUTH_PASSWORD_RESPONSE,
 143                                            user_info, &user_info_new);
 144                 if (tevent_req_nterror(req, status)) {
 145                         return tevent_req_post(req, ev);
 146                 }
 147                 user_info = user_info_new;
 148
 149                 network_info = talloc_zero(state, struct netr_NetworkInfo);
 150                 if (tevent_req_nomem(network_info, req)) {
 151                         return tevent_req_post(req, ev);
 152                 }
 153
 154                 status = auth_get_challenge(ctx->auth_ctx, chal);
 155                 if (tevent_req_nterror(req, status)) {
 156                         return tevent_req_post(req, ev);
 157                 }
 158
 159                 memcpy(network_info->challenge, chal, sizeof(network_info->challenge));
 160
 161                 network_info->nt.length = user_info->password.response.nt.length;
 162                 network_info->nt.data   = user_info->password.response.nt.data;
 163
 164                 network_info->lm.length = user_info->password.response.lanman.length;
 165                 network_info->lm.data   = user_info->password.response.lanman.data;
 166
 167                 identity_info = &network_info->identity_info;
 168                 state->req.in.logon_level       = 2;
 169                 state->req.in.logon.network = network_info;
 170         }
 171
 172         identity_info->domain_name.string       = user_info->client.domain_name;
 173         identity_info->parameter_control        = user_info->logon_parameters; /* see MSV1_0_* */
 174         identity_info->logon_id_low             = 0;
 175         identity_info->logon_id_high            = 0;
 176         identity_info->account_name.string      = user_info->client.account_name;
 177         identity_info->workstation.string       = user_info->workstation_name;
 178
 179         state->req.in.validation_level = 6;
 180
 181         subreq = dcerpc_winbind_SamLogon_r_send(state, ev, irpc_handle,
 182                                                 &state->req);
 183         if (tevent_req_nomem(subreq, req)) {
 184                 return tevent_req_post(req, ev);
 185         }
 186         tevent_req_set_callback(subreq,
 187                                 winbind_check_password_done,
 188                                 req);
 189
 190         return req;
 191 }
 192
 193 static void winbind_check_password_done(struct tevent_req *subreq)
 194 {
 195         struct tevent_req *req =
 196                 tevent_req_callback_data(subreq,
 197                 struct tevent_req);
 198         struct winbind_check_password_state *state =
 199                 tevent_req_data(req,
 200                 struct winbind_check_password_state);
 201         struct auth_method_context *ctx = state->ctx;
 202         const struct auth_usersupplied_info *user_info = state->user_info;
 203         struct ldb_dn *domain_dn = NULL;
 204         const char *nt4_domain = NULL;
 205         const char *nt4_account = NULL;
 206         struct ldb_message *msg = NULL;
 207         NTSTATUS status;
 208
 209         status = dcerpc_winbind_SamLogon_r_recv(subreq, state);
 210         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 211                 status = NT_STATUS_NO_LOGON_SERVERS;
 212         }
 213         TALLOC_FREE(subreq);
 214         if (tevent_req_nterror(req, status)) {
 215                 return;
 216         }
 217
 218         status = state->req.out.result;
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 if (!state->req.out.authoritative) {
 221                         state->authoritative = false;
 222                 }
 223                 tevent_req_nterror(req, status);
 224                 return;
 225         }
 226
 227         status = make_user_info_dc_netlogon_validation(state,
 228                                                       user_info->client.account_name,
 229                                                       state->req.in.validation_level,
 230                                                       &state->req.out.validation,
 231                                                       true, /* This user was authenticated */
 232                                                       &state->user_info_dc);
 233         if (tevent_req_nterror(req, status)) {
 234                 return;
 235         }
 236
 237         nt4_domain = state->user_info_dc->info->domain_name;
 238         nt4_account = state->user_info_dc->info->account_name;
 239
 240         if (lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx, nt4_domain)) {
 241                 domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 242         }
 243
 244         if (domain_dn != NULL) {
 245                 /*
 246                  * At best, reset the badPwdCount to 0 if the account exists.
 247                  * This means that lockouts happen at a badPwdCount earlier than
 248                  * normal, but makes it more fault tolerant.
 249                  */
 250                 status = authsam_search_account(state, ctx->auth_ctx->sam_ctx,
 251                                                 nt4_account, domain_dn, &msg);
 252                 if (NT_STATUS_IS_OK(status)) {
 253                         authsam_logon_success_accounting(
 254                                 ctx->auth_ctx->sam_ctx, msg,
 255                                 domain_dn,
 256                                 user_info->flags & USER_INFO_INTERACTIVE_LOGON,
 257                                 NULL);
 258                 }
 259         }
 260
 261         /*
 262          * We need to expand group memberships within our local domain,
 263          * as the token might be generated by a trusted domain, unless we're
 264          * an RODC.
 265          */
 266         status = authsam_update_user_info_dc(state->user_info_dc,
 267                                              ctx->auth_ctx->sam_ctx,
 268                                              state->user_info_dc);
 269         if (tevent_req_nterror(req, status)) {
 270                 return;
 271         }
 272
 273         tevent_req_done(req);
 274 }
 275
 276 static NTSTATUS winbind_check_password_recv(struct tevent_req *req,
 277                                             TALLOC_CTX *mem_ctx,
 278                                             struct auth_user_info_dc **user_info_dc,
 279                                             bool *pauthoritative)
 280 {
 281         struct winbind_check_password_state *state =
 282                 tevent_req_data(req,
 283                 struct winbind_check_password_state);
 284         NTSTATUS status = NT_STATUS_OK;
 285
 286         *pauthoritative = state->authoritative;
 287
 288         if (tevent_req_is_nterror(req, &status)) {
 289                 tevent_req_received(req);
 290                 return status;
 291         }
 292
 293         *user_info_dc = talloc_move(mem_ctx, &state->user_info_dc);
 294
 295         tevent_req_received(req);
 296         return NT_STATUS_OK;
 297 }
 298
 299 static const struct auth_operations winbind_ops = {
 300         .name                   = "winbind",
 301         .want_check             = winbind_want_check,
 302         .check_password_send    = winbind_check_password_send,
 303         .check_password_recv    = winbind_check_password_recv
 304 };
 305
 306 _PUBLIC_ NTSTATUS auth4_winbind_init(TALLOC_CTX *ctx)
 307 {
 308         NTSTATUS ret;
 309
 310         ret = auth_register(ctx, &winbind_ops);
 311         if (!NT_STATUS_IS_OK(ret)) {
 312                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 313                 return ret;
 314         }
 315
 316         return NT_STATUS_OK;
 317 }