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