source4/ldap_server/ldap_extended.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 "../lib/util/dlinklist.h"
  23 #include "lib/tls/tls.h"
  24 #include "smbd/service_stream.h"
  25
  26 struct ldapsrv_starttls_context {
  27         struct ldapsrv_connection *conn;
  28         struct socket_context *tls_socket;
  29 };
  30
  31 static void ldapsrv_start_tls(void *private_data)
  32 {
  33         struct ldapsrv_starttls_context *ctx = talloc_get_type(private_data, struct ldapsrv_starttls_context);
  34         talloc_steal(ctx->conn->connection, ctx->tls_socket);
  35
  36         ctx->conn->sockets.tls = ctx->tls_socket;
  37         ctx->conn->connection->socket = ctx->tls_socket;
  38         packet_set_socket(ctx->conn->packet, ctx->conn->connection->socket);
  39         packet_set_unreliable_select(ctx->conn->packet);
  40 }
  41
  42 static NTSTATUS ldapsrv_StartTLS(struct ldapsrv_call *call,
  43                                  struct ldapsrv_reply *reply,
  44                                  const char **errstr)
  45 {
  46         struct ldapsrv_starttls_context *ctx;
  47
  48         (*errstr) = NULL;
  49
  50         /*
  51          * TODO: give LDAP_OPERATIONS_ERROR also when
  52          *       there're pending requests or there's
  53          *       a SASL bind in progress
  54          *       (see rfc4513 section 3.1.1)
  55          */
  56         if (call->conn->sockets.tls) {
  57                 (*errstr) = talloc_asprintf(reply, "START-TLS: TLS is already enabled on this LDAP session");
  58                 return NT_STATUS_LDAP(LDAP_OPERATIONS_ERROR);
  59         }
  60
  61         ctx = talloc(call, struct ldapsrv_starttls_context);
  62         NT_STATUS_HAVE_NO_MEMORY(ctx);
  63
  64         ctx->conn = call->conn;
  65         ctx->tls_socket = tls_init_server(call->conn->service->tls_params,
  66                                           call->conn->connection->socket,
  67                                           call->conn->connection->event.fde,
  68                                           NULL);
  69         if (!ctx->tls_socket) {
  70                 (*errstr) = talloc_asprintf(reply, "START-TLS: Failed to setup TLS socket");
  71                 return NT_STATUS_LDAP(LDAP_OPERATIONS_ERROR);
  72         }
  73
  74         call->send_callback = ldapsrv_start_tls;
  75         call->send_private  = ctx;
  76
  77         reply->msg->r.ExtendedResponse.response.resultcode = LDAP_SUCCESS;
  78         reply->msg->r.ExtendedResponse.response.errormessage = NULL;
  79
  80         ldapsrv_queue_reply(call, reply);
  81         return NT_STATUS_OK;
  82 }
  83
  84 struct ldapsrv_extended_operation {
  85         const char *oid;
  86         NTSTATUS (*fn)(struct ldapsrv_call *call, struct ldapsrv_reply *reply, const char **errorstr);
  87 };
  88
  89 static struct ldapsrv_extended_operation extended_ops[] = {
  90         {
  91                 .oid    = LDB_EXTENDED_START_TLS_OID,
  92                 .fn     = ldapsrv_StartTLS,
  93         },{
  94                 .oid    = NULL,
  95                 .fn     = NULL,
  96         }
  97 };
  98
  99 NTSTATUS ldapsrv_ExtendedRequest(struct ldapsrv_call *call)
 100 {
 101         struct ldap_ExtendedRequest *req = &call->request->r.ExtendedRequest;
 102         struct ldapsrv_reply *reply;
 103         int result = LDAP_PROTOCOL_ERROR;
 104         const char *error_str = NULL;
 105         NTSTATUS status = NT_STATUS_OK;
 106         unsigned int i;
 107
 108         DEBUG(10, ("Extended\n"));
 109
 110         reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
 111         NT_STATUS_HAVE_NO_MEMORY(reply);
 112
 113         ZERO_STRUCT(reply->msg->r);
 114         reply->msg->r.ExtendedResponse.oid = talloc_steal(reply, req->oid);
 115         reply->msg->r.ExtendedResponse.response.resultcode = LDAP_PROTOCOL_ERROR;
 116         reply->msg->r.ExtendedResponse.response.errormessage = NULL;
 117
 118         for (i=0; extended_ops[i].oid; i++) {
 119                 if (strcmp(extended_ops[i].oid,req->oid) != 0) continue;
 120
 121                 /*
 122                  * if the backend function returns an error we
 123                  * need to send the reply otherwise the reply is already
 124                  * send and we need to return directly
 125                  */
 126                 status = extended_ops[i].fn(call, reply, &error_str);
 127                 NT_STATUS_IS_OK_RETURN(status);
 128
 129                 if (NT_STATUS_IS_LDAP(status)) {
 130                         result = NT_STATUS_LDAP_CODE(status);
 131                 } else {
 132                         result = LDAP_OPERATIONS_ERROR;
 133                         error_str = talloc_asprintf(reply, "Extended Operation(%s) failed: %s",
 134                                                     req->oid, nt_errstr(status));
 135                 }
 136         }
 137         /* if we haven't found the oid, then status is still NT_STATUS_OK */
 138         if (NT_STATUS_IS_OK(status)) {
 139                 error_str = talloc_asprintf(reply, "Extended Operation(%s) not supported",
 140                                             req->oid);
 141         }
 142
 143         reply->msg->r.ExtendedResponse.response.resultcode = result;
 144         reply->msg->r.ExtendedResponse.response.errormessage = error_str;
 145
 146         ldapsrv_queue_reply(call, reply);
 147         return NT_STATUS_OK;
 148 }