--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ module to store/fetch session keys for the schannel server
+
+ Copyright (C) Andrew Tridgell 2004
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006-2009
+
+ 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 "includes.h"
+#include "lib/ldb/include/ldb.h"
+#include "librpc/gen_ndr/ndr_security.h"
+#include "ldb_wrap.h"
+#include "../lib/util/util_ldb.h"
+#include "libcli/auth/libcli_auth.h"
+#include "auth/auth.h"
+#include "param/param.h"
+#include "auth/gensec/schannel_state.h"
+
+static struct ldb_val *schannel_dom_sid_ldb_val(TALLOC_CTX *mem_ctx,
+ struct dom_sid *sid)
+{
+ enum ndr_err_code ndr_err;
+ struct ldb_val *v;
+
+ v = talloc(mem_ctx, struct ldb_val);
+ if (!v) return NULL;
+
+ ndr_err = ndr_push_struct_blob(v, mem_ctx, NULL, sid,
+ (ndr_push_flags_fn_t)ndr_push_dom_sid);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ talloc_free(v);
+ return NULL;
+ }
+
+ return v;
+}
+
+static struct dom_sid *schannel_ldb_val_dom_sid(TALLOC_CTX *mem_ctx,
+ const struct ldb_val *v)
+{
+ enum ndr_err_code ndr_err;
+ struct dom_sid *sid;
+
+ sid = talloc(mem_ctx, struct dom_sid);
+ if (!sid) return NULL;
+
+ ndr_err = ndr_pull_struct_blob(v, sid, NULL, sid,
+ (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ talloc_free(sid);
+ return NULL;
+ }
+ return sid;
+}
+
+
+/*
+ remember an established session key for a netr server authentication
+ use a simple ldb structure
+*/
+NTSTATUS schannel_store_session_key(struct ldb_context *ldb,
+ TALLOC_CTX *mem_ctx,
+ struct netlogon_creds_CredentialState *creds)
+{
+ struct ldb_message *msg;
+ struct ldb_val val, seed, client_state, server_state;
+ struct ldb_val *sid_val;
+ char *f;
+ char *sct;
+ int ret;
+
+ f = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->negotiate_flags);
+
+ if (f == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ sct = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->secure_channel_type);
+
+ if (sct == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ msg = ldb_msg_new(ldb);
+ if (msg == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ msg->dn = ldb_dn_new_fmt(msg, ldb, "computerName=%s", creds->computer_name);
+ if ( ! msg->dn) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ sid_val = schannel_dom_sid_ldb_val(msg, creds->sid);
+ if (sid_val == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ val.data = creds->session_key;
+ val.length = sizeof(creds->session_key);
+
+ seed.data = creds->seed.data;
+ seed.length = sizeof(creds->seed.data);
+
+ client_state.data = creds->client.data;
+ client_state.length = sizeof(creds->client.data);
+ server_state.data = creds->server.data;
+ server_state.length = sizeof(creds->server.data);
+
+ ldb_msg_add_string(msg, "objectClass", "schannelState");
+ ldb_msg_add_value(msg, "sessionKey", &val, NULL);
+ ldb_msg_add_value(msg, "seed", &seed, NULL);
+ ldb_msg_add_value(msg, "clientState", &client_state, NULL);
+ ldb_msg_add_value(msg, "serverState", &server_state, NULL);
+ ldb_msg_add_string(msg, "negotiateFlags", f);
+ ldb_msg_add_string(msg, "secureChannelType", sct);
+ ldb_msg_add_string(msg, "accountName", creds->account_name);
+ ldb_msg_add_string(msg, "computerName", creds->computer_name);
+ ldb_msg_add_value(msg, "objectSid", sid_val, NULL);
+
+ ret = ldb_add(ldb, msg);
+ if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
+ int i;
+ /* from samdb_replace() */
+ /* mark all the message elements as LDB_FLAG_MOD_REPLACE */
+ for (i=0;i<msg->num_elements;i++) {
+ msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
+ }
+
+ ret = ldb_modify(ldb, msg);
+ }
+
+ /* We don't need a transaction here, as we either add or
+ * modify records, never delete them, so it must exist */
+
+ if (ret != 0) {
+ DEBUG(0,("Unable to add %s to session key db - %s\n",
+ ldb_dn_get_linearized(msg->dn), ldb_errstring(ldb)));
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ return NT_STATUS_OK;
+}
+
+/*
+ read back a credentials back for a computer
+*/
+NTSTATUS schannel_fetch_session_key(struct ldb_context *ldb,
+ TALLOC_CTX *mem_ctx,
+ const char *computer_name,
+ struct netlogon_creds_CredentialState **creds)
+{
+ struct ldb_result *res;
+ int ret;
+ const struct ldb_val *val;
+
+ *creds = talloc_zero(mem_ctx, struct netlogon_creds_CredentialState);
+ if (!*creds) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ret = ldb_search(ldb, mem_ctx, &res,
+ NULL, LDB_SCOPE_SUBTREE, NULL,
+ "(computerName=%s)", computer_name);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(3,("schannel: Failed to find a record for client %s: %s\n", computer_name, ldb_errstring(ldb)));
+ return NT_STATUS_INVALID_HANDLE;
+ }
+ if (res->count != 1) {
+ DEBUG(3,("schannel: Failed to find a record for client: %s (found %d records)\n", computer_name, res->count));
+ talloc_free(res);
+ return NT_STATUS_INVALID_HANDLE;
+ }
+
+ val = ldb_msg_find_ldb_val(res->msgs[0], "sessionKey");
+ if (val == NULL || val->length != 16) {
+ DEBUG(1,("schannel: record in schannel DB must contain a sessionKey of length 16, when searching for client: %s\n", computer_name));
+ talloc_free(res);
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ memcpy((*creds)->session_key, val->data, 16);
+
+ val = ldb_msg_find_ldb_val(res->msgs[0], "seed");
+ if (val == NULL || val->length != 8) {
+ DEBUG(1,("schannel: record in schannel DB must contain a vaid seed of length 8, when searching for client: %s\n", computer_name));
+ talloc_free(res);
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ memcpy((*creds)->seed.data, val->data, 8);
+
+ val = ldb_msg_find_ldb_val(res->msgs[0], "clientState");
+ if (val == NULL || val->length != 8) {
+ DEBUG(1,("schannel: record in schannel DB must contain a vaid clientState of length 8, when searching for client: %s\n", computer_name));
+ talloc_free(res);
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+ memcpy((*creds)->client.data, val->data, 8);
+
+ val = ldb_msg_find_ldb_val(res->msgs[0], "serverState");
+ if (val == NULL || val->length != 8) {
+ DEBUG(1,("schannel: record in schannel DB must contain a vaid serverState of length 8, when searching for client: %s\n", computer_name));
+ talloc_free(res);
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+ memcpy((*creds)->server.data, val->data, 8);
+
+ (*creds)->negotiate_flags = ldb_msg_find_attr_as_int(res->msgs[0], "negotiateFlags", 0);
+
+ (*creds)->secure_channel_type = ldb_msg_find_attr_as_int(res->msgs[0], "secureChannelType", 0);
+
+ (*creds)->account_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "accountName", NULL));
+ if ((*creds)->account_name == NULL) {
+ talloc_free(res);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ (*creds)->computer_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "computerName", NULL));
+ if ((*creds)->computer_name == NULL) {
+ talloc_free(res);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ val = ldb_msg_find_ldb_val(res->msgs[0], "objectSid");
+ if (val) {
+ (*creds)->sid = schannel_ldb_val_dom_sid(*creds, val);
+ if ((*creds)->sid == NULL) {
+ talloc_free(res);
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+ } else {
+ (*creds)->sid = NULL;
+ }
+
+ talloc_free(res);
+ return NT_STATUS_OK;
+}
+
+/*
+ Validate an incoming authenticator against the credentials for the remote machine.
+
+ The credentials are (re)read and from the schannel database, and
+ written back after the caclulations are performed.
+
+ The creds_out parameter (if not NULL) returns the credentials, if
+ the caller needs some of that information.
+
+*/
+NTSTATUS schannel_creds_server_step_check(struct ldb_context *ldb,
+ TALLOC_CTX *mem_ctx,
+ bool schannel_in_use,
+ const char *computer_name,
+ struct netr_Authenticator *received_authenticator,
+ struct netr_Authenticator *return_authenticator,
+ struct netlogon_creds_CredentialState **creds_out)
+{
+ struct netlogon_creds_CredentialState *creds;
+ NTSTATUS nt_status;
+ int ret;
+
+ ret = ldb_transaction_start(ldb);
+ if (ret != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ /* Because this is a shared structure (even across
+ * disconnects) we must update the database every time we
+ * update the structure */
+
+ nt_status = schannel_fetch_session_key(ldb, ldb, computer_name,
+ &creds);
+
+ /* Ensure that once the client and server agree on schannel, that all future calls must use it */
+ if (creds->negotiate_flags & NETLOGON_NEG_SCHANNEL && !schannel_in_use) {
+ DEBUG(0,("schannel_creds_server_step_check: client %s not using schannel for netlogon, despite negotiating it\n",
+ creds->computer_name ));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ nt_status = netlogon_creds_server_step_check(creds,
+ received_authenticator,
+ return_authenticator);
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ nt_status = schannel_store_session_key(ldb, mem_ctx, creds);
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ ldb_transaction_commit(ldb);
+ if (creds_out) {
+ *creds_out = creds;
+ talloc_steal(mem_ctx, creds);
+ }
+ } else {
+ ldb_transaction_cancel(ldb);
+ }
+ return nt_status;
+}
#include "includes.h"
#include "lib/ldb/include/ldb.h"
-#include "librpc/gen_ndr/ndr_security.h"
#include "ldb_wrap.h"
#include "../lib/util/util_ldb.h"
#include "libcli/auth/libcli_auth.h"
#include "param/param.h"
#include "auth/gensec/schannel_state.h"
-static struct ldb_val *schannel_dom_sid_ldb_val(TALLOC_CTX *mem_ctx,
- struct smb_iconv_convenience *smbiconv,
- struct dom_sid *sid)
-{
- enum ndr_err_code ndr_err;
- struct ldb_val *v;
-
- v = talloc(mem_ctx, struct ldb_val);
- if (!v) return NULL;
-
- ndr_err = ndr_push_struct_blob(v, mem_ctx, smbiconv, sid,
- (ndr_push_flags_fn_t)ndr_push_dom_sid);
- if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
- talloc_free(v);
- return NULL;
- }
-
- return v;
-}
-
-static struct dom_sid *schannel_ldb_val_dom_sid(TALLOC_CTX *mem_ctx,
- const struct ldb_val *v)
-{
- enum ndr_err_code ndr_err;
- struct dom_sid *sid;
-
- sid = talloc(mem_ctx, struct dom_sid);
- if (!sid) return NULL;
-
- ndr_err = ndr_pull_struct_blob(v, sid, NULL, sid,
- (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
- if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
- talloc_free(sid);
- return NULL;
- }
- return sid;
-}
-
-
/**
connect to the schannel ldb
*/
return ldb;
}
-/*
- remember an established session key for a netr server authentication
- use a simple ldb structure
-*/
-NTSTATUS schannel_store_session_key_ldb(TALLOC_CTX *mem_ctx,
- struct ldb_context *ldb,
- struct creds_CredentialState *creds)
-{
- struct ldb_message *msg;
- struct ldb_val val, seed, client_state, server_state;
- struct smb_iconv_convenience *smbiconv;
- struct ldb_val *sid_val;
- char *f;
- char *sct;
- int ret;
-
- f = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->negotiate_flags);
-
- if (f == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
- sct = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->secure_channel_type);
-
- if (sct == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
- msg = ldb_msg_new(ldb);
- if (msg == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
- msg->dn = ldb_dn_new_fmt(msg, ldb, "computerName=%s", creds->computer_name);
- if ( ! msg->dn) {
- return NT_STATUS_NO_MEMORY;
- }
-
- smbiconv = lp_iconv_convenience(ldb_get_opaque(ldb, "loadparm"));
- sid_val = schannel_dom_sid_ldb_val(msg, smbiconv, creds->sid);
- if (sid_val == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
- val.data = creds->session_key;
- val.length = sizeof(creds->session_key);
-
- seed.data = creds->seed.data;
- seed.length = sizeof(creds->seed.data);
-
- client_state.data = creds->client.data;
- client_state.length = sizeof(creds->client.data);
- server_state.data = creds->server.data;
- server_state.length = sizeof(creds->server.data);
-
- ldb_msg_add_string(msg, "objectClass", "schannelState");
- ldb_msg_add_value(msg, "sessionKey", &val, NULL);
- ldb_msg_add_value(msg, "seed", &seed, NULL);
- ldb_msg_add_value(msg, "clientState", &client_state, NULL);
- ldb_msg_add_value(msg, "serverState", &server_state, NULL);
- ldb_msg_add_string(msg, "negotiateFlags", f);
- ldb_msg_add_string(msg, "secureChannelType", sct);
- ldb_msg_add_string(msg, "accountName", creds->account_name);
- ldb_msg_add_string(msg, "computerName", creds->computer_name);
- ldb_msg_add_string(msg, "flatname", creds->domain);
- ldb_msg_add_value(msg, "objectSid", sid_val, NULL);
-
- ldb_delete(ldb, msg->dn);
-
- ret = ldb_add(ldb, msg);
-
- if (ret != 0) {
- DEBUG(0,("Unable to add %s to session key db - %s\n",
- ldb_dn_get_linearized(msg->dn), ldb_errstring(ldb)));
- return NT_STATUS_INTERNAL_DB_CORRUPTION;
- }
-
- return NT_STATUS_OK;
-}
-
-NTSTATUS schannel_store_session_key(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev_ctx,
- struct loadparm_context *lp_ctx,
- struct creds_CredentialState *creds)
-{
- struct ldb_context *ldb;
- NTSTATUS nt_status;
- int ret;
-
- ldb = schannel_db_connect(mem_ctx, ev_ctx, lp_ctx);
- if (!ldb) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- ret = ldb_transaction_start(ldb);
- if (ret != 0) {
- talloc_free(ldb);
- return NT_STATUS_INTERNAL_DB_CORRUPTION;
- }
-
- nt_status = schannel_store_session_key_ldb(mem_ctx, ldb, creds);
-
- if (NT_STATUS_IS_OK(nt_status)) {
- ret = ldb_transaction_commit(ldb);
- } else {
- ret = ldb_transaction_cancel(ldb);
- }
-
- if (ret != 0) {
- DEBUG(0,("Unable to commit adding credentials for %s to schannel key db - %s\n",
- creds->computer_name, ldb_errstring(ldb)));
- talloc_free(ldb);
- return NT_STATUS_INTERNAL_DB_CORRUPTION;
- }
-
- talloc_free(ldb);
- return nt_status;
-}
-
-/*
- read back a credentials back for a computer
-*/
-NTSTATUS schannel_fetch_session_key_ldb(TALLOC_CTX *mem_ctx,
- struct ldb_context *ldb,
- const char *computer_name,
- const char *domain,
- struct creds_CredentialState **creds)
-{
- struct ldb_result *res;
- int ret;
- const struct ldb_val *val;
-
- *creds = talloc_zero(mem_ctx, struct creds_CredentialState);
- if (!*creds) {
- return NT_STATUS_NO_MEMORY;
- }
-
- ret = ldb_search(ldb, mem_ctx, &res,
- NULL, LDB_SCOPE_SUBTREE, NULL,
- "(&(computerName=%s)(flatname=%s))", computer_name, domain);
- if (ret != LDB_SUCCESS) {
- DEBUG(3,("schannel: Failed to find a record for client %s: %s\n", computer_name, ldb_errstring(ldb)));
- return NT_STATUS_INVALID_HANDLE;
- }
- if (res->count != 1) {
- DEBUG(3,("schannel: Failed to find a record for client: %s (found %d records)\n", computer_name, res->count));
- talloc_free(res);
- return NT_STATUS_INVALID_HANDLE;
- }
-
- val = ldb_msg_find_ldb_val(res->msgs[0], "sessionKey");
- if (val == NULL || val->length != 16) {
- DEBUG(1,("schannel: record in schannel DB must contain a sessionKey of length 16, when searching for client: %s\n", computer_name));
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- memcpy((*creds)->session_key, val->data, 16);
-
- val = ldb_msg_find_ldb_val(res->msgs[0], "seed");
- if (val == NULL || val->length != 8) {
- DEBUG(1,("schannel: record in schannel DB must contain a vaid seed of length 8, when searching for client: %s\n", computer_name));
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- memcpy((*creds)->seed.data, val->data, 8);
-
- val = ldb_msg_find_ldb_val(res->msgs[0], "clientState");
- if (val == NULL || val->length != 8) {
- DEBUG(1,("schannel: record in schannel DB must contain a vaid clientState of length 8, when searching for client: %s\n", computer_name));
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
- memcpy((*creds)->client.data, val->data, 8);
-
- val = ldb_msg_find_ldb_val(res->msgs[0], "serverState");
- if (val == NULL || val->length != 8) {
- DEBUG(1,("schannel: record in schannel DB must contain a vaid serverState of length 8, when searching for client: %s\n", computer_name));
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
- memcpy((*creds)->server.data, val->data, 8);
-
- (*creds)->negotiate_flags = ldb_msg_find_attr_as_int(res->msgs[0], "negotiateFlags", 0);
-
- (*creds)->secure_channel_type = ldb_msg_find_attr_as_int(res->msgs[0], "secureChannelType", 0);
-
- (*creds)->account_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "accountName", NULL));
- if ((*creds)->account_name == NULL) {
- talloc_free(res);
- return NT_STATUS_NO_MEMORY;
- }
-
- (*creds)->computer_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "computerName", NULL));
- if ((*creds)->computer_name == NULL) {
- talloc_free(res);
- return NT_STATUS_NO_MEMORY;
- }
-
- (*creds)->domain = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "flatname", NULL));
- if ((*creds)->domain == NULL) {
- talloc_free(res);
- return NT_STATUS_NO_MEMORY;
- }
-
- val = ldb_msg_find_ldb_val(res->msgs[0], "objectSid");
- if (val == NULL) {
- DEBUG(1,("schannel: missing ObjectSid for client: %s\n", computer_name));
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
- (*creds)->sid = schannel_ldb_val_dom_sid(*creds, val);
- if ((*creds)->sid == NULL) {
- talloc_free(res);
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- talloc_free(res);
- return NT_STATUS_OK;
-}
-
-NTSTATUS schannel_fetch_session_key(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev_ctx,
- struct loadparm_context *lp_ctx,
- const char *computer_name,
- const char *domain,
- struct creds_CredentialState **creds)
-{
- NTSTATUS nt_status;
- struct ldb_context *ldb;
-
- ldb = schannel_db_connect(mem_ctx, ev_ctx, lp_ctx);
- if (!ldb) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- nt_status = schannel_fetch_session_key_ldb(mem_ctx, ldb,
- computer_name, domain,
- creds);
- talloc_free(ldb);
- return nt_status;
-}
git.samba.org / sfrench / samba-autobuild / .git / commitdiff