--- /dev/null
+/*
+ * Unix SMB/CIFS implementation.
+ * Gensec based tldap auth
+ * Copyright (C) Volker Lendecke 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "tldap_gensec_bind.h"
+#include "tldap_util.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/util/talloc_stack.h"
+#include "lib/util/samba_util.h"
+#include "lib/util/debug.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h" /* TODO: remove this */
+#include "lib/param/param.h"
+#include "source4/auth/gensec/gensec_tstream.h"
+
+struct tldap_gensec_bind_state {
+ struct tevent_context *ev;
+ struct tldap_context *ctx;
+ struct cli_credentials *creds;
+ const char *target_service;
+ const char *target_hostname;
+ const char *target_principal;
+ struct loadparm_context *lp_ctx;
+ uint32_t gensec_features;
+
+ bool first;
+ struct gensec_security *gensec;
+ NTSTATUS gensec_status;
+ DATA_BLOB gensec_output;
+};
+
+static void tldap_gensec_bind_got_mechs(struct tevent_req *subreq);
+static void tldap_gensec_update_done(struct tevent_req *subreq);
+static void tldap_gensec_bind_done(struct tevent_req *subreq);
+
+struct tevent_req *tldap_gensec_bind_send(
+ TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ struct tldap_context *ctx, struct cli_credentials *creds,
+ const char *target_service, const char *target_hostname,
+ const char *target_principal, struct loadparm_context *lp_ctx,
+ uint32_t gensec_features)
+{
+ struct tevent_req *req, *subreq;
+ struct tldap_gensec_bind_state *state;
+
+ const char *attrs[] = { "supportedSASLMechanisms" };
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct tldap_gensec_bind_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->ctx = ctx;
+ state->creds = creds;
+ state->target_service = target_service;
+ state->target_hostname = target_hostname;
+ state->target_principal = target_principal;
+ state->lp_ctx = lp_ctx;
+ state->gensec_features = gensec_features;
+ state->first = true;
+
+ subreq = tldap_search_all_send(
+ state, state->ev, state->ctx, "", TLDAP_SCOPE_BASE,
+ "(objectclass=*)", attrs, ARRAY_SIZE(attrs),
+ false, NULL, 0, NULL, 0, 0, 1 /* sizelimit */, 0);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, tldap_gensec_bind_got_mechs, req);
+ return req;
+}
+
+static void tldap_gensec_bind_got_mechs(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct tldap_gensec_bind_state *state = tevent_req_data(
+ req, struct tldap_gensec_bind_state);
+ struct tldap_message **msgs, *msg, *result;
+ struct tldap_attribute *attribs, *attrib;
+ int num_attribs;
+ size_t num_msgs;
+ TLDAPRC rc;
+ int i;
+ bool ok;
+ const char **sasl_mechs;
+ NTSTATUS status;
+
+ rc = tldap_search_all_recv(subreq, state, &msgs, &result);
+ TALLOC_FREE(subreq);
+ if (tevent_req_ldap_error(req, rc)) {
+ return;
+ }
+
+ /*
+ * TODO: Inspect "Result"
+ */
+
+ num_msgs = talloc_array_length(msgs);
+ if (num_msgs != 1) {
+ DBG_DEBUG("num_msgs = %zu\n", num_msgs);
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+ msg = msgs[0];
+
+ ok = tldap_entry_attributes(msg, &attribs, &num_attribs);
+ if (!ok) {
+ DBG_DEBUG("tldap_entry_attributes failed\n");
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+
+ if (num_attribs != 1) {
+ DBG_DEBUG("num_attribs = %d\n", num_attribs);
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+ attrib = &attribs[0];
+
+ sasl_mechs = talloc_array(state, const char *, attrib->num_values+1);
+ if (tevent_req_nomem(sasl_mechs, req)) {
+ return;
+ }
+
+ for (i=0; i<attrib->num_values; i++) {
+ DATA_BLOB *v = &attrib->values[i];
+ size_t len;
+
+ ok = convert_string_talloc(sasl_mechs, CH_UTF8, CH_UNIX,
+ v->data, v->length,
+ &sasl_mechs[i], &len);
+ if (!ok) {
+ DBG_DEBUG("convert_string_talloc failed\n");
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+ }
+ sasl_mechs[attrib->num_values] = NULL;
+
+ gensec_init();
+
+ status = gensec_client_start(
+ state, &state->gensec,
+ lpcfg_gensec_settings(state, state->lp_ctx));
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_client_start failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+
+ status = gensec_set_credentials(state->gensec, state->creds);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_set_credentials failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+
+ status = gensec_set_target_service(state->gensec,
+ state->target_service);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_set_target_service failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+
+ if (state->target_hostname != NULL) {
+ status = gensec_set_target_hostname(state->gensec,
+ state->target_hostname);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_set_target_hostname failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+ }
+
+ if (state->target_principal != NULL) {
+ status = gensec_set_target_principal(state->gensec,
+ state->target_principal);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_set_target_principal failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+ }
+
+ gensec_want_feature(state->gensec, state->gensec_features);
+
+ status = gensec_start_mech_by_sasl_list(state->gensec, sasl_mechs);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_start_mech_by_sasl_list failed: %s\n",
+ nt_errstr(status));
+ tevent_req_ldap_error(req, TLDAP_OPERATIONS_ERROR);
+ return;
+ }
+
+ subreq = gensec_update_send(state, state->ev, state->gensec,
+ data_blob_null);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, tldap_gensec_update_done, req);
+}
+
+static void tldap_gensec_update_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct tldap_gensec_bind_state *state = tevent_req_data(
+ req, struct tldap_gensec_bind_state);
+
+ state->gensec_status = gensec_update_recv(
+ subreq, state, &state->gensec_output);
+
+ TALLOC_FREE(subreq);
+
+ if (!NT_STATUS_IS_OK(state->gensec_status) &&
+ !NT_STATUS_EQUAL(state->gensec_status,
+ NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+ DBG_DEBUG("gensec_update failed: %s\n",
+ nt_errstr(state->gensec_status));
+ tevent_req_ldap_error(req, TLDAP_INVALID_CREDENTIALS);
+ return;
+ }
+
+ if (NT_STATUS_IS_OK(state->gensec_status) &&
+ (state->gensec_output.length == 0)) {
+
+ if (state->first) {
+ tevent_req_ldap_error(req, TLDAP_INVALID_CREDENTIALS);
+ } else {
+ tevent_req_done(req);
+ }
+ return;
+ }
+
+ state->first = false;
+
+ subreq = tldap_sasl_bind_send(
+ state, state->ev, state->ctx, "",
+ state->gensec->ops->sasl_name, &state->gensec_output,
+ NULL, 0, NULL, 0);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, tldap_gensec_bind_done, req);
+}
+
+static void tldap_gensec_bind_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct tldap_gensec_bind_state *state = tevent_req_data(
+ req, struct tldap_gensec_bind_state);
+ DATA_BLOB input;
+ TLDAPRC rc;
+
+ rc = tldap_sasl_bind_recv(subreq, state, &input);
+ TALLOC_FREE(subreq);
+ if (!TLDAP_RC_IS_SUCCESS(rc) &&
+ !TLDAP_RC_EQUAL(rc, TLDAP_SASL_BIND_IN_PROGRESS)) {
+ tevent_req_ldap_error(req, rc);
+ return;
+ }
+
+ if (TLDAP_RC_IS_SUCCESS(rc) && NT_STATUS_IS_OK(state->gensec_status)) {
+ tevent_req_done(req);
+ return;
+ }
+
+ subreq = gensec_update_send(state, state->ev, state->gensec, input);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, tldap_gensec_update_done, req);
+}
+
+TLDAPRC tldap_gensec_bind_recv(struct tevent_req *req)
+{
+ struct tldap_gensec_bind_state *state = tevent_req_data(
+ req, struct tldap_gensec_bind_state);
+ struct tstream_context *plain, *sec;
+ NTSTATUS status;
+ TLDAPRC rc;
+
+ if (tevent_req_is_ldap_error(req, &rc)) {
+ return rc;
+ }
+
+ if ((state->gensec_features & GENSEC_FEATURE_SIGN) &&
+ !gensec_have_feature(state->gensec, GENSEC_FEATURE_SIGN)) {
+ return TLDAP_OPERATIONS_ERROR;
+ }
+ if ((state->gensec_features & GENSEC_FEATURE_SEAL) &&
+ !gensec_have_feature(state->gensec, GENSEC_FEATURE_SEAL)) {
+ return TLDAP_OPERATIONS_ERROR;
+ }
+
+ if (!gensec_have_feature(state->gensec, GENSEC_FEATURE_SIGN) &&
+ !gensec_have_feature(state->gensec, GENSEC_FEATURE_SEAL)) {
+ return TLDAP_SUCCESS;
+ }
+
+ /*
+ * The gensec ctx needs to survive as long as the ldap context
+ * lives
+ */
+ talloc_steal(state->ctx, state->gensec);
+
+ plain = tldap_get_tstream(state->ctx);
+
+ status = gensec_create_tstream(state->ctx, state->gensec,
+ plain, &sec);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_DEBUG("gensec_create_tstream failed: %s\n",
+ nt_errstr(status));
+ return TLDAP_OPERATIONS_ERROR;
+ }
+
+ tldap_set_tstream(state->ctx, sec);
+
+ return TLDAP_SUCCESS;
+}
+
+TLDAPRC tldap_gensec_bind(
+ struct tldap_context *ctx, struct cli_credentials *creds,
+ const char *target_service, const char *target_hostname,
+ const char *target_principal, struct loadparm_context *lp_ctx,
+ uint32_t gensec_features)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct tevent_context *ev;
+ struct tevent_req *req;
+ TLDAPRC rc = TLDAP_NO_MEMORY;
+
+ ev = samba_tevent_context_init(frame);
+ if (ev == NULL) {
+ goto fail;
+ }
+ req = tldap_gensec_bind_send(frame, ev, ctx, creds, target_service,
+ target_hostname, target_principal, lp_ctx,
+ gensec_features);
+ if (req == NULL) {
+ goto fail;
+ }
+ if (!tevent_req_poll(req, ev)) {
+ rc = TLDAP_OPERATIONS_ERROR;
+ goto fail;
+ }
+ rc = tldap_gensec_bind_recv(req);
+ fail:
+ TALLOC_FREE(frame);
+ return rc;
+}
git.samba.org / samba.git / commitdiff