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 "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 "param/param.h"
  30
  31 static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
  32 {
  33         struct ldap_BindRequest *req = &call->request->r.BindRequest;
  34         struct ldapsrv_reply *reply;
  35         struct ldap_BindResponse *resp;
  36
  37         int result;
  38         const char *errstr;
  39         const char *nt4_domain, *nt4_account;
  40
  41         struct auth_session_info *session_info;
  42
  43         NTSTATUS status;
  44
  45         DEBUG(10, ("BindSimple dn: %s\n",req->dn));
  46
  47         status = crack_auto_name_to_nt4_name(call, call->conn->connection->event.ctx, call->conn->lp_ctx, req->dn, &nt4_domain, &nt4_account);
  48         if (NT_STATUS_IS_OK(status)) {
  49                 status = authenticate_username_pw(call,
  50                                                   call->conn->connection->event.ctx,
  51                                                   call->conn->connection->msg_ctx,
  52                                                   call->conn->lp_ctx,
  53                                                   nt4_domain, nt4_account,
  54                                                   req->creds.password,
  55                                                   &session_info);
  56         }
  57
  58         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
  59         if (!reply) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62
  63         if (NT_STATUS_IS_OK(status)) {
  64                 result = LDAP_SUCCESS;
  65                 errstr = NULL;
  66
  67                 talloc_free(call->conn->session_info);
  68                 call->conn->session_info = session_info;
  69                 talloc_steal(call->conn, session_info);
  70
  71                 /* don't leak the old LDB */
  72                 talloc_free(call->conn->ldb);
  73
  74                 status = ldapsrv_backend_Init(call->conn);
  75
  76                 if (!NT_STATUS_IS_OK(status)) {
  77                         result = LDAP_OPERATIONS_ERROR;
  78                         errstr = talloc_asprintf(reply, "Simple Bind: Failed to advise ldb new credentials: %s", nt_errstr(status));
  79                 }
  80         } else {
  81                 status = auth_nt_status_squash(status);
  82
  83                 result = LDAP_INVALID_CREDENTIALS;
  84                 errstr = talloc_asprintf(reply, "Simple Bind Failed: %s", nt_errstr(status));
  85         }
  86
  87         resp = &reply->msg->r.BindResponse;
  88         resp->response.resultcode = result;
  89         resp->response.errormessage = errstr;
  90         resp->response.dn = NULL;
  91         resp->response.referral = NULL;
  92         resp->SASL.secblob = NULL;
  93
  94         ldapsrv_queue_reply(call, reply);
  95         return NT_STATUS_OK;
  96 }
  97
  98 struct ldapsrv_sasl_context {
  99         struct ldapsrv_connection *conn;
 100         struct socket_context *sasl_socket;
 101 };
 102
 103 static void ldapsrv_set_sasl(void *private)
 104 {
 105         struct ldapsrv_sasl_context *ctx = talloc_get_type(private, struct ldapsrv_sasl_context);
 106         talloc_steal(ctx->conn->connection, ctx->sasl_socket);
 107         talloc_unlink(ctx->conn->connection, ctx->conn->connection->socket);
 108
 109         ctx->conn->sockets.sasl = ctx->sasl_socket;
 110         ctx->conn->connection->socket = ctx->sasl_socket;
 111         packet_set_socket(ctx->conn->packet, ctx->conn->connection->socket);
 112 }
 113
 114 static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
 115 {
 116         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 117         struct ldapsrv_reply *reply;
 118         struct ldap_BindResponse *resp;
 119         struct ldapsrv_connection *conn;
 120         int result = 0;
 121         const char *errstr=NULL;
 122         NTSTATUS status = NT_STATUS_OK;
 123
 124         DEBUG(10, ("BindSASL dn: %s\n",req->dn));
 125
 126         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 127         if (!reply) {
 128                 return NT_STATUS_NO_MEMORY;
 129         }
 130         resp = &reply->msg->r.BindResponse;
 131
 132         conn = call->conn;
 133
 134         /*
 135          * TODO: a SASL bind with a different mechanism
 136          *       should cancel an inprogress SASL bind.
 137          *       (see RFC 4513)
 138          */
 139
 140         if (!conn->gensec) {
 141                 conn->session_info = NULL;
 142
 143                 status = gensec_server_start(conn,
 144                                              conn->connection->event.ctx,
 145                                              lp_gensec_settings(conn, conn->lp_ctx),
 146                                              conn->connection->msg_ctx,
 147                                              &conn->gensec);
 148                 if (!NT_STATUS_IS_OK(status)) {
 149                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 150                         result = LDAP_OPERATIONS_ERROR;
 151                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 152                                                  nt_errstr(status));
 153                 } else {
 154
 155                         gensec_set_target_service(conn->gensec, "ldap");
 156
 157                         gensec_set_credentials(conn->gensec, conn->server_credentials);
 158
 159                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SIGN);
 160                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SEAL);
 161                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_ASYNC_REPLIES);
 162
 163                         status = gensec_start_mech_by_sasl_name(conn->gensec, req->creds.SASL.mechanism);
 164
 165                         if (!NT_STATUS_IS_OK(status)) {
 166                                 DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n",
 167                                           req->creds.SASL.mechanism, nt_errstr(status)));
 168                                 result = LDAP_OPERATIONS_ERROR;
 169                                 errstr = talloc_asprintf(reply, "SASL:[%s]: Failed to start authentication backend: %s",
 170                                                          req->creds.SASL.mechanism, nt_errstr(status));
 171                         }
 172                 }
 173         }
 174
 175         if (NT_STATUS_IS_OK(status)) {
 176                 DATA_BLOB input = data_blob(NULL, 0);
 177                 DATA_BLOB output = data_blob(NULL, 0);
 178
 179                 if (req->creds.SASL.secblob) {
 180                         input = *req->creds.SASL.secblob;
 181                 }
 182
 183                 status = gensec_update(conn->gensec, reply,
 184                                        input, &output);
 185
 186                 /* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
 187                 resp->SASL.secblob = talloc(reply, DATA_BLOB);
 188                 NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 189                 *resp->SASL.secblob = output;
 190         } else {
 191                 resp->SASL.secblob = NULL;
 192         }
 193
 194         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 195                 result = LDAP_SASL_BIND_IN_PROGRESS;
 196                 errstr = NULL;
 197         } else if (NT_STATUS_IS_OK(status)) {
 198                 struct auth_session_info *old_session_info=NULL;
 199                 struct ldapsrv_sasl_context *ctx;
 200
 201                 result = LDAP_SUCCESS;
 202                 errstr = NULL;
 203
 204                 ctx = talloc(call, struct ldapsrv_sasl_context);
 205
 206                 if (!ctx) {
 207                         status = NT_STATUS_NO_MEMORY;
 208                 } else {
 209                         ctx->conn = conn;
 210                         status = gensec_socket_init(conn->gensec,
 211                                                     conn->connection,
 212                                                     conn->connection->socket,
 213                                                     conn->connection->event.ctx,
 214                                                     stream_io_handler_callback,
 215                                                     conn->connection,
 216                                                     &ctx->sasl_socket);
 217                 }
 218
 219                 if (!ctx || !NT_STATUS_IS_OK(status)) {
 220                         conn->session_info = old_session_info;
 221                         result = LDAP_OPERATIONS_ERROR;
 222                         errstr = talloc_asprintf(reply,
 223                                                  "SASL:[%s]: Failed to setup SASL socket: %s",
 224                                                  req->creds.SASL.mechanism, nt_errstr(status));
 225                 } else {
 226
 227                         call->send_callback = ldapsrv_set_sasl;
 228                         call->send_private = ctx;
 229
 230                         old_session_info = conn->session_info;
 231                         conn->session_info = NULL;
 232                         status = gensec_session_info(conn->gensec, &conn->session_info);
 233                         if (!NT_STATUS_IS_OK(status)) {
 234                                 conn->session_info = old_session_info;
 235                                 result = LDAP_OPERATIONS_ERROR;
 236                                 errstr = talloc_asprintf(reply,
 237                                                          "SASL:[%s]: Failed to get session info: %s",
 238                                                          req->creds.SASL.mechanism, nt_errstr(status));
 239                         } else {
 240                                 talloc_free(old_session_info);
 241                                 talloc_steal(conn, conn->session_info);
 242
 243                                 /* don't leak the old LDB */
 244                                 talloc_free(conn->ldb);
 245
 246                                 status = ldapsrv_backend_Init(conn);
 247
 248                                 if (!NT_STATUS_IS_OK(status)) {
 249                                         result = LDAP_OPERATIONS_ERROR;
 250                                         errstr = talloc_asprintf(reply,
 251                                                                  "SASL:[%s]: Failed to advise samdb of new credentials: %s",
 252                                                                  req->creds.SASL.mechanism,
 253                                                                  nt_errstr(status));
 254                                 }
 255                         }
 256                 }
 257         } else {
 258                 status = auth_nt_status_squash(status);
 259                 if (result == 0) {
 260                         result = LDAP_INVALID_CREDENTIALS;
 261                         errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
 262                 }
 263         }
 264
 265         resp->response.resultcode = result;
 266         resp->response.dn = NULL;
 267         resp->response.errormessage = errstr;
 268         resp->response.referral = NULL;
 269
 270         ldapsrv_queue_reply(call, reply);
 271         return NT_STATUS_OK;
 272 }
 273
 274 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 275 {
 276         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 277         struct ldapsrv_reply *reply;
 278         struct ldap_BindResponse *resp;
 279
 280         /*
 281          * TODO: we should fail the bind request
 282          *       if there're any pending requests.
 283          *
 284          *       also a simple bind should cancel an
 285          *       inprogress SASL bind.
 286          *       (see RFC 4513)
 287          */
 288         switch (req->mechanism) {
 289                 case LDAP_AUTH_MECH_SIMPLE:
 290                         return ldapsrv_BindSimple(call);
 291                 case LDAP_AUTH_MECH_SASL:
 292                         return ldapsrv_BindSASL(call);
 293         }
 294
 295         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 296         if (!reply) {
 297                 return NT_STATUS_NO_MEMORY;
 298         }
 299
 300         resp = &reply->msg->r.BindResponse;
 301         resp->response.resultcode = 7;
 302         resp->response.dn = NULL;
 303         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 304         resp->response.referral = NULL;
 305         resp->SASL.secblob = NULL;
 306
 307         ldapsrv_queue_reply(call, reply);
 308         return NT_STATUS_OK;
 309 }
 310
 311 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 312 {
 313         DEBUG(10, ("UnbindRequest\n"));
 314         return NT_STATUS_OK;
 315 }