source4/ldap_server/ldap_bind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    LDAP server
   4    Copyright (C) Stefan Metzmacher 2004
   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 "ldap_server/ldap_server.h"
  22 #include "auth/auth.h"
  23 #include "smbd/service.h"
  24 #include <ldb.h>
  25 #include <ldb_errors.h>
  26 #include "dsdb/samdb/samdb.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "auth/gensec/gensec_tstream.h"
  29 #include "param/param.h"
  30 #include "../lib/util/tevent_ntstatus.h"
  31
  32 static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
  33 {
  34         struct ldap_BindRequest *req = &call->request->r.BindRequest;
  35         struct ldapsrv_reply *reply;
  36         struct ldap_BindResponse *resp;
  37
  38         int result;
  39         const char *errstr;
  40         const char *nt4_domain, *nt4_account;
  41
  42         struct auth_session_info *session_info;
  43
  44         NTSTATUS status;
  45
  46         DEBUG(10, ("BindSimple dn: %s\n",req->dn));
  47
  48         status = crack_auto_name_to_nt4_name(call, call->conn->connection->event.ctx, call->conn->lp_ctx, req->dn, &nt4_domain, &nt4_account);
  49         if (NT_STATUS_IS_OK(status)) {
  50                 status = authenticate_username_pw(call,
  51                                                   call->conn->connection->event.ctx,
  52                                                   call->conn->connection->msg_ctx,
  53                                                   call->conn->lp_ctx,
  54                                                   nt4_domain, nt4_account,
  55                                                   req->creds.password,
  56                                                   MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
  57                                                   MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
  58                                                   &session_info);
  59         }
  60
  61         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
  62         if (!reply) {
  63                 return NT_STATUS_NO_MEMORY;
  64         }
  65
  66         if (NT_STATUS_IS_OK(status)) {
  67                 result = LDAP_SUCCESS;
  68                 errstr = NULL;
  69
  70                 talloc_unlink(call->conn, call->conn->session_info);
  71                 call->conn->session_info = session_info;
  72                 talloc_steal(call->conn, session_info);
  73
  74                 /* don't leak the old LDB */
  75                 talloc_unlink(call->conn, call->conn->ldb);
  76
  77                 status = ldapsrv_backend_Init(call->conn);
  78
  79                 if (!NT_STATUS_IS_OK(status)) {
  80                         result = LDAP_OPERATIONS_ERROR;
  81                         errstr = talloc_asprintf(reply, "Simple Bind: Failed to advise ldb new credentials: %s", nt_errstr(status));
  82                 }
  83         } else {
  84                 status = nt_status_squash(status);
  85
  86                 result = LDAP_INVALID_CREDENTIALS;
  87                 errstr = talloc_asprintf(reply, "Simple Bind Failed: %s", nt_errstr(status));
  88         }
  89
  90         resp = &reply->msg->r.BindResponse;
  91         resp->response.resultcode = result;
  92         resp->response.errormessage = errstr;
  93         resp->response.dn = NULL;
  94         resp->response.referral = NULL;
  95         resp->SASL.secblob = NULL;
  96
  97         ldapsrv_queue_reply(call, reply);
  98         return NT_STATUS_OK;
  99 }
 100
 101 struct ldapsrv_sasl_postprocess_context {
 102         struct ldapsrv_connection *conn;
 103         struct tstream_context *sasl;
 104 };
 105
 106 struct ldapsrv_sasl_postprocess_state {
 107         uint8_t dummy;
 108 };
 109
 110 static struct tevent_req *ldapsrv_sasl_postprocess_send(TALLOC_CTX *mem_ctx,
 111                                                 struct tevent_context *ev,
 112                                                 void *private_data)
 113 {
 114         struct ldapsrv_sasl_postprocess_context *context =
 115                 talloc_get_type_abort(private_data,
 116                 struct ldapsrv_sasl_postprocess_context);
 117         struct tevent_req *req;
 118         struct ldapsrv_sasl_postprocess_state *state;
 119
 120         req = tevent_req_create(mem_ctx, &state,
 121                                 struct ldapsrv_sasl_postprocess_state);
 122         if (req == NULL) {
 123                 return NULL;
 124         }
 125
 126         TALLOC_FREE(context->conn->sockets.sasl);
 127         context->conn->sockets.sasl = talloc_move(context->conn, &context->sasl);
 128         context->conn->sockets.active = context->conn->sockets.sasl;
 129
 130         tevent_req_done(req);
 131         return tevent_req_post(req, ev);
 132 }
 133
 134 static NTSTATUS ldapsrv_sasl_postprocess_recv(struct tevent_req *req)
 135 {
 136         return tevent_req_simple_recv_ntstatus(req);
 137 }
 138
 139 static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
 140 {
 141         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 142         struct ldapsrv_reply *reply;
 143         struct ldap_BindResponse *resp;
 144         struct ldapsrv_connection *conn;
 145         int result = 0;
 146         const char *errstr=NULL;
 147         NTSTATUS status = NT_STATUS_OK;
 148
 149         DEBUG(10, ("BindSASL dn: %s\n",req->dn));
 150
 151         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 152         if (!reply) {
 153                 return NT_STATUS_NO_MEMORY;
 154         }
 155         resp = &reply->msg->r.BindResponse;
 156
 157         conn = call->conn;
 158
 159         /*
 160          * TODO: a SASL bind with a different mechanism
 161          *       should cancel an inprogress SASL bind.
 162          *       (see RFC 4513)
 163          */
 164
 165         if (!conn->gensec) {
 166                 conn->session_info = NULL;
 167
 168                 status = samba_server_gensec_start(conn,
 169                                                    conn->connection->event.ctx,
 170                                                    conn->connection->msg_ctx,
 171                                                    conn->lp_ctx,
 172                                                    conn->server_credentials,
 173                                                    "ldap",
 174                                                    &conn->gensec);
 175                 if (!NT_STATUS_IS_OK(status)) {
 176                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 177                         result = LDAP_OPERATIONS_ERROR;
 178                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 179                                                  nt_errstr(status));
 180                 } else {
 181
 182                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SIGN);
 183                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SEAL);
 184                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_ASYNC_REPLIES);
 185
 186                         status = gensec_start_mech_by_sasl_name(conn->gensec, req->creds.SASL.mechanism);
 187
 188                         if (!NT_STATUS_IS_OK(status)) {
 189                                 DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n",
 190                                           req->creds.SASL.mechanism, nt_errstr(status)));
 191                                 result = LDAP_OPERATIONS_ERROR;
 192                                 errstr = talloc_asprintf(reply, "SASL:[%s]: Failed to start authentication backend: %s",
 193                                                          req->creds.SASL.mechanism, nt_errstr(status));
 194                         }
 195                 }
 196         }
 197
 198         if (NT_STATUS_IS_OK(status)) {
 199                 DATA_BLOB input = data_blob(NULL, 0);
 200                 DATA_BLOB output = data_blob(NULL, 0);
 201
 202                 if (req->creds.SASL.secblob) {
 203                         input = *req->creds.SASL.secblob;
 204                 }
 205
 206                 status = gensec_update(conn->gensec, reply,
 207                                        input, &output);
 208
 209                 /* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
 210                 resp->SASL.secblob = talloc(reply, DATA_BLOB);
 211                 NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 212                 *resp->SASL.secblob = output;
 213         } else {
 214                 resp->SASL.secblob = NULL;
 215         }
 216
 217         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 218                 result = LDAP_SASL_BIND_IN_PROGRESS;
 219                 errstr = NULL;
 220         } else if (NT_STATUS_IS_OK(status)) {
 221                 struct auth_session_info *old_session_info=NULL;
 222                 struct ldapsrv_sasl_postprocess_context *context = NULL;
 223
 224                 result = LDAP_SUCCESS;
 225                 errstr = NULL;
 226
 227                 if (gensec_have_feature(conn->gensec, GENSEC_FEATURE_SIGN) ||
 228                     gensec_have_feature(conn->gensec, GENSEC_FEATURE_SEAL)) {
 229
 230                         context = talloc(call, struct ldapsrv_sasl_postprocess_context);
 231
 232                         if (!context) {
 233                                 status = NT_STATUS_NO_MEMORY;
 234                         }
 235                 }
 236
 237                 if (context && conn->sockets.tls) {
 238                         TALLOC_FREE(context);
 239                         status = NT_STATUS_NOT_SUPPORTED;
 240                         result = LDAP_UNWILLING_TO_PERFORM;
 241                         errstr = talloc_asprintf(reply,
 242                                                  "SASL:[%s]: Sign or Seal are not allowed if TLS is used",
 243                                                  req->creds.SASL.mechanism);
 244                 }
 245
 246                 if (context && conn->sockets.sasl) {
 247                         TALLOC_FREE(context);
 248                         status = NT_STATUS_NOT_SUPPORTED;
 249                         result = LDAP_UNWILLING_TO_PERFORM;
 250                         errstr = talloc_asprintf(reply,
 251                                                  "SASL:[%s]: Sign or Seal are not allowed if SASL encryption has already been set up",
 252                                                  req->creds.SASL.mechanism);
 253                 }
 254
 255                 if (context) {
 256                         context->conn = conn;
 257                         status = gensec_create_tstream(context,
 258                                                        context->conn->gensec,
 259                                                        context->conn->sockets.raw,
 260                                                        &context->sasl);
 261                         if (NT_STATUS_IS_OK(status)) {
 262                                 if (!talloc_reference(context->sasl, conn->gensec)) {
 263                                         status = NT_STATUS_NO_MEMORY;
 264                                 }
 265                         }
 266                 }
 267
 268                 if (result != LDAP_SUCCESS) {
 269                         conn->session_info = old_session_info;
 270                 } else if (!NT_STATUS_IS_OK(status)) {
 271                         conn->session_info = old_session_info;
 272                         result = LDAP_OPERATIONS_ERROR;
 273                         errstr = talloc_asprintf(reply,
 274                                                  "SASL:[%s]: Failed to setup SASL socket: %s",
 275                                                  req->creds.SASL.mechanism, nt_errstr(status));
 276                 } else {
 277
 278                         old_session_info = conn->session_info;
 279                         conn->session_info = NULL;
 280                         status = gensec_session_info(conn->gensec, &conn->session_info);
 281                         if (!NT_STATUS_IS_OK(status)) {
 282                                 conn->session_info = old_session_info;
 283                                 result = LDAP_OPERATIONS_ERROR;
 284                                 errstr = talloc_asprintf(reply,
 285                                                          "SASL:[%s]: Failed to get session info: %s",
 286                                                          req->creds.SASL.mechanism, nt_errstr(status));
 287                         } else {
 288                                 talloc_unlink(conn, old_session_info);
 289                                 talloc_steal(conn, conn->session_info);
 290
 291                                 /* don't leak the old LDB */
 292                                 talloc_unlink(conn, conn->ldb);
 293
 294                                 status = ldapsrv_backend_Init(conn);
 295
 296                                 if (!NT_STATUS_IS_OK(status)) {
 297                                         result = LDAP_OPERATIONS_ERROR;
 298                                         errstr = talloc_asprintf(reply,
 299                                                                  "SASL:[%s]: Failed to advise samdb of new credentials: %s",
 300                                                                  req->creds.SASL.mechanism,
 301                                                                  nt_errstr(status));
 302                                 }
 303                         }
 304                 }
 305
 306                 if (NT_STATUS_IS_OK(status) && context) {
 307                         call->postprocess_send = ldapsrv_sasl_postprocess_send;
 308                         call->postprocess_recv = ldapsrv_sasl_postprocess_recv;
 309                         call->postprocess_private = context;
 310                 }
 311                 talloc_unlink(conn, conn->gensec);
 312                 conn->gensec = NULL;
 313         } else {
 314                 status = nt_status_squash(status);
 315                 if (result == 0) {
 316                         result = LDAP_INVALID_CREDENTIALS;
 317                         errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
 318                 }
 319                 talloc_unlink(conn, conn->gensec);
 320                 conn->gensec = NULL;
 321         }
 322
 323         resp->response.resultcode = result;
 324         resp->response.dn = NULL;
 325         resp->response.errormessage = errstr;
 326         resp->response.referral = NULL;
 327
 328         ldapsrv_queue_reply(call, reply);
 329         return NT_STATUS_OK;
 330 }
 331
 332 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 333 {
 334         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 335         struct ldapsrv_reply *reply;
 336         struct ldap_BindResponse *resp;
 337
 338         /*
 339          * TODO: we should fail the bind request
 340          *       if there're any pending requests.
 341          *
 342          *       also a simple bind should cancel an
 343          *       inprogress SASL bind.
 344          *       (see RFC 4513)
 345          */
 346         switch (req->mechanism) {
 347                 case LDAP_AUTH_MECH_SIMPLE:
 348                         return ldapsrv_BindSimple(call);
 349                 case LDAP_AUTH_MECH_SASL:
 350                         return ldapsrv_BindSASL(call);
 351         }
 352
 353         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 354         if (!reply) {
 355                 return NT_STATUS_NO_MEMORY;
 356         }
 357
 358         resp = &reply->msg->r.BindResponse;
 359         resp->response.resultcode = 7;
 360         resp->response.dn = NULL;
 361         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 362         resp->response.referral = NULL;
 363         resp->SASL.secblob = NULL;
 364
 365         ldapsrv_queue_reply(call, reply);
 366         return NT_STATUS_OK;
 367 }
 368
 369 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 370 {
 371         DEBUG(10, ("UnbindRequest\n"));
 372         return NT_STATUS_OK;
 373 }