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