source/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 "libcli/ldap/ldap.h"
  24 #include "smbd/service.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "lib/ldb/include/ldb_errors.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "auth/gensec/socket.h"
  30 #include "param/param.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, global_loadparm, 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                                                   global_loadparm,
  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_free(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_free(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_context {
 100         struct ldapsrv_connection *conn;
 101         struct socket_context *sasl_socket;
 102 };
 103
 104 static void ldapsrv_set_sasl(void *private)
 105 {
 106         struct ldapsrv_sasl_context *ctx = talloc_get_type(private, struct ldapsrv_sasl_context);
 107         talloc_steal(ctx->conn->connection, ctx->sasl_socket);
 108         talloc_unlink(ctx->conn->connection, ctx->conn->connection->socket);
 109
 110         ctx->conn->sockets.sasl = ctx->sasl_socket;
 111         ctx->conn->connection->socket = ctx->sasl_socket;
 112         packet_set_socket(ctx->conn->packet, ctx->conn->connection->socket);
 113 }
 114
 115 static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
 116 {
 117         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 118         struct ldapsrv_reply *reply;
 119         struct ldap_BindResponse *resp;
 120         struct ldapsrv_connection *conn;
 121         int result = 0;
 122         const char *errstr=NULL;
 123         NTSTATUS status = NT_STATUS_OK;
 124
 125         DEBUG(10, ("BindSASL dn: %s\n",req->dn));
 126
 127         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 128         if (!reply) {
 129                 return NT_STATUS_NO_MEMORY;
 130         }
 131         resp = &reply->msg->r.BindResponse;
 132
 133         conn = call->conn;
 134
 135         /*
 136          * TODO: a SASL bind with a different mechanism
 137          *       should cancel an inprogress SASL bind.
 138          *       (see RFC 4513)
 139          */
 140
 141         if (!conn->gensec) {
 142                 conn->session_info = NULL;
 143
 144                 status = gensec_server_start(conn,
 145                                              conn->connection->event.ctx,
 146                                              global_loadparm,
 147                                              conn->connection->msg_ctx,
 148                                              &conn->gensec);
 149                 if (!NT_STATUS_IS_OK(status)) {
 150                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 151                         result = LDAP_OPERATIONS_ERROR;
 152                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 153                                                  nt_errstr(status));
 154                 } else {
 155
 156                         gensec_set_target_service(conn->gensec, "ldap");
 157
 158                         gensec_set_credentials(conn->gensec, conn->server_credentials);
 159
 160                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SIGN);
 161                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SEAL);
 162                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_ASYNC_REPLIES);
 163
 164                         status = gensec_start_mech_by_sasl_name(conn->gensec, req->creds.SASL.mechanism);
 165
 166                         if (!NT_STATUS_IS_OK(status)) {
 167                                 DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n",
 168                                           req->creds.SASL.mechanism, nt_errstr(status)));
 169                                 result = LDAP_OPERATIONS_ERROR;
 170                                 errstr = talloc_asprintf(reply, "SASL:[%s]: Failed to start authentication backend: %s",
 171                                                          req->creds.SASL.mechanism, nt_errstr(status));
 172                         }
 173                 }
 174         }
 175
 176         if (NT_STATUS_IS_OK(status)) {
 177                 DATA_BLOB input = data_blob(NULL, 0);
 178                 DATA_BLOB output = data_blob(NULL, 0);
 179
 180                 if (req->creds.SASL.secblob) {
 181                         input = *req->creds.SASL.secblob;
 182                 }
 183
 184                 resp->SASL.secblob = talloc(reply, DATA_BLOB);
 185                 NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 186
 187                 status = gensec_update(conn->gensec, reply,
 188                                        input, &output);
 189
 190                 /* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
 191                 resp->SASL.secblob = talloc(reply, DATA_BLOB);
 192                 NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 193                 *resp->SASL.secblob = output;
 194         } else {
 195                 resp->SASL.secblob = NULL;
 196         }
 197
 198         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 199                 result = LDAP_SASL_BIND_IN_PROGRESS;
 200                 errstr = NULL;
 201         } else if (NT_STATUS_IS_OK(status)) {
 202                 struct auth_session_info *old_session_info=NULL;
 203                 struct ldapsrv_sasl_context *ctx;
 204
 205                 result = LDAP_SUCCESS;
 206                 errstr = NULL;
 207
 208                 ctx = talloc(call, struct ldapsrv_sasl_context);
 209
 210                 if (!ctx) {
 211                         status = NT_STATUS_NO_MEMORY;
 212                 } else {
 213                         ctx->conn = conn;
 214                         status = gensec_socket_init(conn->gensec,
 215                                                     conn->connection->socket,
 216                                                     conn->connection->event.ctx,
 217                                                     stream_io_handler_callback,
 218                                                     conn->connection,
 219                                                     &ctx->sasl_socket);
 220                 }
 221
 222                 if (!ctx || !NT_STATUS_IS_OK(status)) {
 223                         conn->session_info = old_session_info;
 224                         result = LDAP_OPERATIONS_ERROR;
 225                         errstr = talloc_asprintf(reply,
 226                                                  "SASL:[%s]: Failed to setup SASL socket: %s",
 227                                                  req->creds.SASL.mechanism, nt_errstr(status));
 228                 } else {
 229
 230                         call->send_callback = ldapsrv_set_sasl;
 231                         call->send_private = ctx;
 232
 233                         old_session_info = conn->session_info;
 234                         conn->session_info = NULL;
 235                         status = gensec_session_info(conn->gensec, &conn->session_info);
 236                         if (!NT_STATUS_IS_OK(status)) {
 237                                 conn->session_info = old_session_info;
 238                                 result = LDAP_OPERATIONS_ERROR;
 239                                 errstr = talloc_asprintf(reply,
 240                                                          "SASL:[%s]: Failed to get session info: %s",
 241                                                          req->creds.SASL.mechanism, nt_errstr(status));
 242                         } else {
 243                                 talloc_free(old_session_info);
 244                                 talloc_steal(conn, conn->session_info);
 245
 246                                 /* don't leak the old LDB */
 247                                 talloc_free(conn->ldb);
 248
 249                                 status = ldapsrv_backend_Init(conn);
 250
 251                                 if (!NT_STATUS_IS_OK(status)) {
 252                                         result = LDAP_OPERATIONS_ERROR;
 253                                         errstr = talloc_asprintf(reply,
 254                                                                  "SASL:[%s]: Failed to advise samdb of new credentials: %s",
 255                                                                  req->creds.SASL.mechanism,
 256                                                                  nt_errstr(status));
 257                                 }
 258                         }
 259                 }
 260         } else {
 261                 status = auth_nt_status_squash(status);
 262                 if (result == 0) {
 263                         result = LDAP_INVALID_CREDENTIALS;
 264                         errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
 265                 }
 266         }
 267
 268         resp->response.resultcode = result;
 269         resp->response.dn = NULL;
 270         resp->response.errormessage = errstr;
 271         resp->response.referral = NULL;
 272
 273         ldapsrv_queue_reply(call, reply);
 274         return NT_STATUS_OK;
 275 }
 276
 277 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 278 {
 279         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 280         struct ldapsrv_reply *reply;
 281         struct ldap_BindResponse *resp;
 282
 283         /*
 284          * TODO: we should fail the bind request
 285          *       if there're any pending requests.
 286          *
 287          *       also a simple bind should cancel an
 288          *       inprogress SASL bind.
 289          *       (see RFC 4513)
 290          */
 291         switch (req->mechanism) {
 292                 case LDAP_AUTH_MECH_SIMPLE:
 293                         return ldapsrv_BindSimple(call);
 294                 case LDAP_AUTH_MECH_SASL:
 295                         return ldapsrv_BindSASL(call);
 296         }
 297
 298         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 299         if (!reply) {
 300                 return NT_STATUS_NO_MEMORY;
 301         }
 302
 303         resp = &reply->msg->r.BindResponse;
 304         resp->response.resultcode = 7;
 305         resp->response.dn = NULL;
 306         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 307         resp->response.referral = NULL;
 308         resp->SASL.secblob = NULL;
 309
 310         ldapsrv_queue_reply(call, reply);
 311         return NT_STATUS_OK;
 312 }
 313
 314 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 315 {
 316         DEBUG(10, ("UnbindRequest\n"));
 317         return NT_STATUS_OK;
 318 }