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366f8cf090
We also log if a simple bind was over TLS, as this particular case matters to a lot of folks Signed-off-by: Andrew Bartlett <abartlet@samba.org> Signed-off-by: Andrew Bartlett <abartlet@samba.org>
489 lines
13 KiB
C
489 lines
13 KiB
C
/*
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Unix SMB/CIFS implementation.
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LDAP server
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Copyright (C) Stefan Metzmacher 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "ldap_server/ldap_server.h"
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#include "auth/auth.h"
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#include "smbd/service.h"
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#include <ldb.h>
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#include <ldb_errors.h>
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#include "dsdb/samdb/samdb.h"
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#include "auth/gensec/gensec.h"
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#include "auth/gensec/gensec_tstream.h"
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#include "param/param.h"
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#include "../lib/util/tevent_ntstatus.h"
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static char *ldapsrv_bind_error_msg(TALLOC_CTX *mem_ctx,
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HRESULT hresult,
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uint32_t DSID,
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NTSTATUS status)
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{
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WERROR werr;
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char *msg = NULL;
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status = nt_status_squash(status);
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werr = ntstatus_to_werror(status);
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/*
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* There are 4 lower case hex digits following 'v' at the end,
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* but different Windows Versions return different values:
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*
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* Windows 2008R2 uses 'v1db1'
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* Windows 2012R2 uses 'v2580'
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*
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* We just match Windows 2008R2 as that's what was referenced
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* in https://bugzilla.samba.org/show_bug.cgi?id=9048
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*/
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msg = talloc_asprintf(mem_ctx, "%08X: LdapErr: DSID-%08X, comment: "
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"AcceptSecurityContext error, data %x, v1db1",
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(unsigned)HRES_ERROR_V(hresult),
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(unsigned)DSID,
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(unsigned)W_ERROR_V(werr));
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return msg;
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}
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static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
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{
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struct ldap_BindRequest *req = &call->request->r.BindRequest;
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struct ldapsrv_reply *reply;
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struct ldap_BindResponse *resp;
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int result;
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const char *errstr;
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struct auth_session_info *session_info;
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NTSTATUS status;
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bool using_tls = call->conn->sockets.active == call->conn->sockets.tls;
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DEBUG(10, ("BindSimple dn: %s\n",req->dn));
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reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
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if (!reply) {
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return NT_STATUS_NO_MEMORY;
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}
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if (req->dn != NULL &&
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strlen(req->dn) != 0 &&
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call->conn->require_strong_auth > LDAP_SERVER_REQUIRE_STRONG_AUTH_NO &&
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!using_tls)
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{
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status = NT_STATUS_NETWORK_ACCESS_DENIED;
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result = LDAP_STRONG_AUTH_REQUIRED;
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errstr = talloc_asprintf(reply,
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"BindSimple: Transport encryption required.");
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goto do_reply;
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}
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status = authenticate_ldap_simple_bind(call,
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call->conn->connection->event.ctx,
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call->conn->connection->msg_ctx,
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call->conn->lp_ctx,
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call->conn->connection->remote_address,
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call->conn->connection->local_address,
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using_tls,
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req->dn,
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req->creds.password,
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&session_info);
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if (NT_STATUS_IS_OK(status)) {
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result = LDAP_SUCCESS;
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errstr = NULL;
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talloc_unlink(call->conn, call->conn->session_info);
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call->conn->session_info = talloc_steal(call->conn, session_info);
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call->conn->authz_logged = true;
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/* don't leak the old LDB */
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talloc_unlink(call->conn, call->conn->ldb);
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status = ldapsrv_backend_Init(call->conn);
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if (!NT_STATUS_IS_OK(status)) {
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result = LDAP_OPERATIONS_ERROR;
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errstr = talloc_asprintf(reply, "Simple Bind: Failed to advise ldb new credentials: %s", nt_errstr(status));
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}
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} else {
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status = nt_status_squash(status);
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result = LDAP_INVALID_CREDENTIALS;
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errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_INVALID_TOKEN,
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0x0C0903A9, status);
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}
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do_reply:
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resp = &reply->msg->r.BindResponse;
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resp->response.resultcode = result;
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resp->response.errormessage = errstr;
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resp->response.dn = NULL;
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resp->response.referral = NULL;
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resp->SASL.secblob = NULL;
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ldapsrv_queue_reply(call, reply);
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return NT_STATUS_OK;
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}
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struct ldapsrv_sasl_postprocess_context {
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struct ldapsrv_connection *conn;
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struct tstream_context *sasl;
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};
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struct ldapsrv_sasl_postprocess_state {
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uint8_t dummy;
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};
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static struct tevent_req *ldapsrv_sasl_postprocess_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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void *private_data)
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{
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struct ldapsrv_sasl_postprocess_context *context =
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talloc_get_type_abort(private_data,
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struct ldapsrv_sasl_postprocess_context);
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struct tevent_req *req;
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struct ldapsrv_sasl_postprocess_state *state;
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req = tevent_req_create(mem_ctx, &state,
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struct ldapsrv_sasl_postprocess_state);
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if (req == NULL) {
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return NULL;
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}
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TALLOC_FREE(context->conn->sockets.sasl);
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context->conn->sockets.sasl = talloc_move(context->conn, &context->sasl);
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context->conn->sockets.active = context->conn->sockets.sasl;
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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static NTSTATUS ldapsrv_sasl_postprocess_recv(struct tevent_req *req)
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{
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return tevent_req_simple_recv_ntstatus(req);
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}
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static NTSTATUS ldapsrv_setup_gensec(struct ldapsrv_connection *conn,
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const char *sasl_mech,
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struct gensec_security **_gensec_security)
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{
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NTSTATUS status;
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struct gensec_security *gensec_security;
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status = samba_server_gensec_start(conn,
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conn->connection->event.ctx,
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conn->connection->msg_ctx,
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conn->lp_ctx,
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conn->server_credentials,
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"ldap",
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&gensec_security);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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status = gensec_set_target_service_description(gensec_security,
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"LDAP");
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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status = gensec_set_remote_address(gensec_security,
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conn->connection->remote_address);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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status = gensec_set_local_address(gensec_security,
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conn->connection->local_address);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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gensec_want_feature(gensec_security, GENSEC_FEATURE_ASYNC_REPLIES);
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gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAP_STYLE);
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if (conn->sockets.active == conn->sockets.tls) {
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gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAPS_TRANSPORT);
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}
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status = gensec_start_mech_by_sasl_name(gensec_security, sasl_mech);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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*_gensec_security = gensec_security;
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return status;
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}
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static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
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{
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struct ldap_BindRequest *req = &call->request->r.BindRequest;
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struct ldapsrv_reply *reply;
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struct ldap_BindResponse *resp;
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struct ldapsrv_connection *conn;
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int result = 0;
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const char *errstr=NULL;
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NTSTATUS status = NT_STATUS_OK;
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DEBUG(10, ("BindSASL dn: %s\n",req->dn));
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reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
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if (!reply) {
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return NT_STATUS_NO_MEMORY;
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}
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resp = &reply->msg->r.BindResponse;
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conn = call->conn;
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/*
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* TODO: a SASL bind with a different mechanism
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* should cancel an inprogress SASL bind.
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* (see RFC 4513)
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*/
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if (!conn->gensec) {
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status = ldapsrv_setup_gensec(conn, req->creds.SASL.mechanism,
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&conn->gensec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start GENSEC server for [%s] code: %s\n",
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ldb_binary_encode_string(call, req->creds.SASL.mechanism),
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nt_errstr(status)));
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result = LDAP_OPERATIONS_ERROR;
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errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
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nt_errstr(status));
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}
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}
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if (NT_STATUS_IS_OK(status)) {
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DATA_BLOB input = data_blob(NULL, 0);
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DATA_BLOB output = data_blob(NULL, 0);
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if (req->creds.SASL.secblob) {
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input = *req->creds.SASL.secblob;
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}
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status = gensec_update_ev(conn->gensec, reply, conn->connection->event.ctx,
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input, &output);
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/* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
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resp->SASL.secblob = talloc(reply, DATA_BLOB);
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NT_STATUS_HAVE_NO_MEMORY(resp->SASL.secblob);
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*resp->SASL.secblob = output;
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} else {
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resp->SASL.secblob = NULL;
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}
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if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
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result = LDAP_SASL_BIND_IN_PROGRESS;
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errstr = NULL;
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} else if (NT_STATUS_IS_OK(status)) {
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struct ldapsrv_sasl_postprocess_context *context = NULL;
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result = LDAP_SUCCESS;
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errstr = NULL;
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if (gensec_have_feature(conn->gensec, GENSEC_FEATURE_SIGN) ||
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gensec_have_feature(conn->gensec, GENSEC_FEATURE_SEAL)) {
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context = talloc(call, struct ldapsrv_sasl_postprocess_context);
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if (!context) {
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status = NT_STATUS_NO_MEMORY;
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}
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}
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if (context && conn->sockets.tls) {
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TALLOC_FREE(context);
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status = NT_STATUS_NOT_SUPPORTED;
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result = LDAP_UNWILLING_TO_PERFORM;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Sign or Seal are not allowed if TLS is used",
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req->creds.SASL.mechanism);
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}
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if (context && conn->sockets.sasl) {
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TALLOC_FREE(context);
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status = NT_STATUS_NOT_SUPPORTED;
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result = LDAP_UNWILLING_TO_PERFORM;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Sign or Seal are not allowed if SASL encryption has already been set up",
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req->creds.SASL.mechanism);
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}
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if (context) {
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context->conn = conn;
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status = gensec_create_tstream(context,
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context->conn->gensec,
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context->conn->sockets.raw,
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&context->sasl);
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if (NT_STATUS_IS_OK(status)) {
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if (!talloc_reference(context->sasl, conn->gensec)) {
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status = NT_STATUS_NO_MEMORY;
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}
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}
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} else {
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switch (call->conn->require_strong_auth) {
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case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
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break;
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case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
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if (call->conn->sockets.active == call->conn->sockets.tls) {
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break;
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}
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status = NT_STATUS_NETWORK_ACCESS_DENIED;
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result = LDAP_STRONG_AUTH_REQUIRED;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: not allowed if TLS is used.",
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req->creds.SASL.mechanism);
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break;
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case LDAP_SERVER_REQUIRE_STRONG_AUTH_YES:
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status = NT_STATUS_NETWORK_ACCESS_DENIED;
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result = LDAP_STRONG_AUTH_REQUIRED;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Sign or Seal are required.",
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req->creds.SASL.mechanism);
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break;
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}
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}
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if (result != LDAP_SUCCESS) {
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} else if (!NT_STATUS_IS_OK(status)) {
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result = LDAP_OPERATIONS_ERROR;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Failed to setup SASL socket: %s",
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req->creds.SASL.mechanism, nt_errstr(status));
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} else {
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struct auth_session_info *old_session_info=NULL;
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old_session_info = conn->session_info;
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conn->session_info = NULL;
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status = gensec_session_info(conn->gensec, conn, &conn->session_info);
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if (!NT_STATUS_IS_OK(status)) {
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conn->session_info = old_session_info;
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result = LDAP_OPERATIONS_ERROR;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Failed to get session info: %s",
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req->creds.SASL.mechanism, nt_errstr(status));
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} else {
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talloc_unlink(conn, old_session_info);
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/* don't leak the old LDB */
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talloc_unlink(conn, conn->ldb);
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call->conn->authz_logged = true;
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status = ldapsrv_backend_Init(conn);
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if (!NT_STATUS_IS_OK(status)) {
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result = LDAP_OPERATIONS_ERROR;
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errstr = talloc_asprintf(reply,
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"SASL:[%s]: Failed to advise samdb of new credentials: %s",
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req->creds.SASL.mechanism,
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nt_errstr(status));
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}
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}
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}
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if (NT_STATUS_IS_OK(status) && context) {
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call->postprocess_send = ldapsrv_sasl_postprocess_send;
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call->postprocess_recv = ldapsrv_sasl_postprocess_recv;
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call->postprocess_private = context;
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}
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talloc_unlink(conn, conn->gensec);
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conn->gensec = NULL;
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} else {
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status = nt_status_squash(status);
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if (result == 0) {
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result = LDAP_INVALID_CREDENTIALS;
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errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_LOGON_DENIED,
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0x0C0904DC, status);
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}
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talloc_unlink(conn, conn->gensec);
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conn->gensec = NULL;
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}
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resp->response.resultcode = result;
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resp->response.dn = NULL;
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resp->response.errormessage = errstr;
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resp->response.referral = NULL;
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ldapsrv_queue_reply(call, reply);
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return NT_STATUS_OK;
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}
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NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
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{
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struct ldap_BindRequest *req = &call->request->r.BindRequest;
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struct ldapsrv_reply *reply;
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struct ldap_BindResponse *resp;
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if (call->conn->pending_calls != NULL) {
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reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
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if (!reply) {
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return NT_STATUS_NO_MEMORY;
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}
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resp = &reply->msg->r.BindResponse;
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resp->response.resultcode = LDAP_BUSY;
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resp->response.dn = NULL;
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resp->response.errormessage = talloc_asprintf(reply, "Pending requests on this LDAP session");
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resp->response.referral = NULL;
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resp->SASL.secblob = NULL;
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ldapsrv_queue_reply(call, reply);
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return NT_STATUS_OK;
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}
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/*
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* TODO: a simple bind should cancel an
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* inprogress SASL bind.
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* (see RFC 4513)
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*/
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switch (req->mechanism) {
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case LDAP_AUTH_MECH_SIMPLE:
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return ldapsrv_BindSimple(call);
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case LDAP_AUTH_MECH_SASL:
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return ldapsrv_BindSASL(call);
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}
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reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
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if (!reply) {
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return NT_STATUS_NO_MEMORY;
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}
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resp = &reply->msg->r.BindResponse;
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resp->response.resultcode = LDAP_AUTH_METHOD_NOT_SUPPORTED;
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resp->response.dn = NULL;
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resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
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resp->response.referral = NULL;
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resp->SASL.secblob = NULL;
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ldapsrv_queue_reply(call, reply);
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return NT_STATUS_OK;
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}
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NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
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{
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DEBUG(10, ("UnbindRequest\n"));
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return NT_STATUS_OK;
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}
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