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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22 #include "ldap_server/ldap_server.h"
  23 #include "auth/auth.h"
  24 #include "libcli/ldap/ldap.h"
  25 #include "smbd/service.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "lib/ldb/include/ldb_errors.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "auth/gensec/gensec.h"
  30 #include "auth/gensec/socket.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_dn_to_nt4_name(call, 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                                                   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                                              conn->connection->msg_ctx,
 146                                              &conn->gensec);
 147                 if (!NT_STATUS_IS_OK(status)) {
 148                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 149                         result = LDAP_OPERATIONS_ERROR;
 150                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 151                                                  nt_errstr(status));
 152                 } else {
 153
 154                         gensec_set_target_service(conn->gensec, "ldap");
 155
 156                         gensec_set_credentials(conn->gensec, conn->server_credentials);
 157
 158                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SIGN);
 159                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_SEAL);
 160                         gensec_want_feature(conn->gensec, GENSEC_FEATURE_ASYNC_REPLIES);
 161
 162                         status = gensec_start_mech_by_sasl_name(conn->gensec, req->creds.SASL.mechanism);
 163
 164                         if (!NT_STATUS_IS_OK(status)) {
 165                                 DEBUG(1, ("Failed to start GENSEC SASL[%s] server code: %s\n",
 166                                           req->creds.SASL.mechanism, nt_errstr(status)));
 167                                 result = LDAP_OPERATIONS_ERROR;
 168                                 errstr = talloc_asprintf(reply, "SASL:[%s]: Failed to start authentication backend: %s",
 169                                                          req->creds.SASL.mechanism, nt_errstr(status));
 170                         }
 171                 }
 172         }
 173
 174         if (NT_STATUS_IS_OK(status)) {
 175                 DATA_BLOB input = data_blob(NULL, 0);
 176                 DATA_BLOB output = data_blob(NULL, 0);
 177
 178                 if (req->creds.SASL.secblob) {
 179                         input = *req->creds.SASL.secblob;
 180                 }
 181
 182                 resp->SASL.secblob = talloc(reply, DATA_BLOB);
 183                 NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 184
 185                 status = gensec_update(conn->gensec, reply,
 186                                        input, &output);
 187
 188                 /* TODO: gensec should really handle the difference between NULL and length=0 better! */
 189                 if (output.data) {
 190                         resp->SASL.secblob = talloc(reply, DATA_BLOB);
 191                         NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
 192                         *resp->SASL.secblob = output;
 193                 } else {
 194                         resp->SASL.secblob = NULL;
 195                 }
 196         } else {
 197                 resp->SASL.secblob = NULL;
 198         }
 199
 200         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 201                 result = LDAP_SASL_BIND_IN_PROGRESS;
 202                 errstr = NULL;
 203         } else if (NT_STATUS_IS_OK(status)) {
 204                 struct auth_session_info *old_session_info=NULL;
 205                 struct ldapsrv_sasl_context *ctx;
 206
 207                 result = LDAP_SUCCESS;
 208                 errstr = NULL;
 209
 210                 ctx = talloc(call, struct ldapsrv_sasl_context);
 211
 212                 if (!ctx) {
 213                         status = NT_STATUS_NO_MEMORY;
 214                 } else {
 215                         ctx->conn = conn;
 216                         status = gensec_socket_init(conn->gensec,
 217                                                     conn->connection->socket,
 218                                                     conn->connection->event.ctx,
 219                                                     stream_io_handler_callback,
 220                                                     conn->connection,
 221                                                     &ctx->sasl_socket);
 222                 }
 223
 224                 if (!ctx || !NT_STATUS_IS_OK(status)) {
 225                         conn->session_info = old_session_info;
 226                         result = LDAP_OPERATIONS_ERROR;
 227                         errstr = talloc_asprintf(reply,
 228                                                  "SASL:[%s]: Failed to setup SASL socket: %s",
 229                                                  req->creds.SASL.mechanism, nt_errstr(status));
 230                 } else {
 231
 232                         call->send_callback = ldapsrv_set_sasl;
 233                         call->send_private = ctx;
 234
 235                         old_session_info = conn->session_info;
 236                         conn->session_info = NULL;
 237                         status = gensec_session_info(conn->gensec, &conn->session_info);
 238                         if (!NT_STATUS_IS_OK(status)) {
 239                                 conn->session_info = old_session_info;
 240                                 result = LDAP_OPERATIONS_ERROR;
 241                                 errstr = talloc_asprintf(reply,
 242                                                          "SASL:[%s]: Failed to get session info: %s",
 243                                                          req->creds.SASL.mechanism, nt_errstr(status));
 244                         } else {
 245                                 talloc_free(old_session_info);
 246                                 talloc_steal(conn, conn->session_info);
 247
 248                                 /* don't leak the old LDB */
 249                                 talloc_free(conn->ldb);
 250
 251                                 status = ldapsrv_backend_Init(conn);
 252
 253                                 if (!NT_STATUS_IS_OK(status)) {
 254                                         result = LDAP_OPERATIONS_ERROR;
 255                                         errstr = talloc_asprintf(reply,
 256                                                                  "SASL:[%s]: Failed to advise samdb of new credentials: %s",
 257                                                                  req->creds.SASL.mechanism,
 258                                                                  nt_errstr(status));
 259                                 }
 260                         }
 261                 }
 262         } else {
 263                 status = auth_nt_status_squash(status);
 264                 if (result == 0) {
 265                         result = LDAP_INVALID_CREDENTIALS;
 266                         errstr = talloc_asprintf(reply, "SASL:[%s]: %s", req->creds.SASL.mechanism, nt_errstr(status));
 267                 }
 268         }
 269
 270         resp->response.resultcode = result;
 271         resp->response.dn = NULL;
 272         resp->response.errormessage = errstr;
 273         resp->response.referral = NULL;
 274
 275         ldapsrv_queue_reply(call, reply);
 276         return NT_STATUS_OK;
 277 }
 278
 279 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 280 {
 281         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 282         struct ldapsrv_reply *reply;
 283         struct ldap_BindResponse *resp;
 284
 285         /*
 286          * TODO: we should fail the bind request
 287          *       if there're any pending requests.
 288          *
 289          *       also a simple bind should cancel an
 290          *       inprogress SASL bind.
 291          *       (see RFC 4513)
 292          */
 293         switch (req->mechanism) {
 294                 case LDAP_AUTH_MECH_SIMPLE:
 295                         return ldapsrv_BindSimple(call);
 296                 case LDAP_AUTH_MECH_SASL:
 297                         return ldapsrv_BindSASL(call);
 298         }
 299
 300         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 301         if (!reply) {
 302                 return NT_STATUS_NO_MEMORY;
 303         }
 304
 305         resp = &reply->msg->r.BindResponse;
 306         resp->response.resultcode = 7;
 307         resp->response.dn = NULL;
 308         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 309         resp->response.referral = NULL;
 310         resp->SASL.secblob = NULL;
 311
 312         ldapsrv_queue_reply(call, reply);
 313         return NT_STATUS_OK;
 314 }
 315
 316 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 317 {
 318         DEBUG(10, ("UnbindRequest\n"));
 319         return NT_STATUS_OK;
 320 }