--- /dev/null
+/*
+ * GSSAPI Acceptor
+ * DCERPC Server functions
+ * Copyright (C) Simo Sorce 2010.
+ *
+ * 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 "../librpc/gen_ndr/ndr_krb5pac.h"
+#include "librpc/crypto/gse.h"
+
+NTSTATUS gssapi_server_auth_start(TALLOC_CTX *mem_ctx,
+ bool do_sign,
+ bool do_seal,
+ bool is_dcerpc,
+ DATA_BLOB *token_in,
+ DATA_BLOB *token_out,
+ struct gse_context **ctx)
+{
+ struct gse_context *gse_ctx = NULL;
+ uint32_t add_flags = 0;
+ NTSTATUS status;
+
+ if (is_dcerpc) {
+ add_flags = GSS_C_DCE_STYLE;
+ }
+
+ /* Let's init the gssapi machinery for this connection */
+ /* passing a NULL server name means the server will try
+ * to accept any connection regardless of the name used as
+ * long as it can find a decryption key */
+ /* by passing NULL, the code will attempt to set a default
+ * keytab based on configuration options */
+ status = gse_init_server(mem_ctx, do_sign, do_seal,
+ add_flags, NULL, &gse_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to init dcerpc gssapi server (%s)\n",
+ nt_errstr(status)));
+ return status;
+ }
+
+ status = gse_get_server_auth_token(mem_ctx, gse_ctx,
+ token_in, token_out);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to parse initial client token (%s)\n",
+ nt_errstr(status)));
+ goto done;
+ }
+
+ *ctx = gse_ctx;
+ status = NT_STATUS_OK;
+
+done:
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(gse_ctx);
+ }
+
+ return status;
+}
+
+NTSTATUS gssapi_server_step(struct gse_context *gse_ctx,
+ TALLOC_CTX *mem_ctx,
+ DATA_BLOB *token_in,
+ DATA_BLOB *token_out)
+{
+ NTSTATUS status;
+
+ status = gse_get_server_auth_token(mem_ctx, gse_ctx,
+ token_in, token_out);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ if (gse_require_more_processing(gse_ctx)) {
+ /* ask for next leg */
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
+
+ return NT_STATUS_OK;
+}
+
+NTSTATUS gssapi_server_check_flags(struct gse_context *gse_ctx)
+{
+ return gse_verify_server_auth_flags(gse_ctx);
+}
+
+NTSTATUS gssapi_server_get_user_info(struct gse_context *gse_ctx,
+ TALLOC_CTX *mem_ctx,
+ struct client_address *client_id,
+ struct auth_serversupplied_info **server_info)
+{
+ TALLOC_CTX *tmp_ctx;
+ DATA_BLOB auth_data;
+ time_t tgs_authtime;
+ NTTIME tgs_authtime_nttime;
+ DATA_BLOB pac;
+ struct PAC_DATA *pac_data;
+ struct PAC_LOGON_NAME *logon_name = NULL;
+ struct PAC_LOGON_INFO *logon_info = NULL;
+ enum ndr_err_code ndr_err;
+ unsigned int i;
+ bool is_mapped;
+ bool is_guest;
+ char *princ_name;
+ char *ntuser;
+ char *ntdomain;
+ char *username;
+ struct passwd *pw;
+ NTSTATUS status;
+ bool bret;
+
+ tmp_ctx = talloc_new(mem_ctx);
+ if (!tmp_ctx) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ status = gse_get_authz_data(gse_ctx, tmp_ctx, &auth_data);
+ if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+ /* TODO: Fetch user by principal name ? */
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
+ }
+
+ bret = unwrap_pac(tmp_ctx, &auth_data, &pac);
+ if (!bret) {
+ DEBUG(1, ("Failed to unwrap PAC\n"));
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+
+ status = gse_get_client_name(gse_ctx, tmp_ctx, &princ_name);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
+ }
+
+ status = gse_get_authtime(gse_ctx, &tgs_authtime);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
+ }
+ unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
+
+ pac_data = talloc_zero(tmp_ctx, struct PAC_DATA);
+ if (!pac_data) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
+ ndr_err = ndr_pull_struct_blob(&pac, pac_data, pac_data,
+ (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(1, ("Failed to parse the PAC for %s\n", princ_name));
+ status = ndr_map_error2ntstatus(ndr_err);
+ goto done;
+ }
+
+ /* get logon name and logon info */
+ for (i = 0; i < pac_data->num_buffers; i++) {
+ struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
+
+ switch (data_buf->type) {
+ case PAC_TYPE_LOGON_INFO:
+ if (!data_buf->info) {
+ break;
+ }
+ logon_info = data_buf->info->logon_info.info;
+ break;
+ case PAC_TYPE_LOGON_NAME:
+ logon_name = &data_buf->info->logon_name;
+ break;
+ default:
+ break;
+ }
+ }
+ if (!logon_info) {
+ DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
+ status = NT_STATUS_NOT_FOUND;
+ goto done;
+ }
+ if (!logon_name) {
+ DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
+ status = NT_STATUS_NOT_FOUND;
+ goto done;
+ }
+
+ /* check time */
+ if (tgs_authtime_nttime != logon_name->logon_time) {
+ DEBUG(1, ("Logon time mismatch between ticket and PAC!\n"
+ "PAC Time = %s | Ticket Time = %s\n",
+ nt_time_string(tmp_ctx, logon_name->logon_time),
+ nt_time_string(tmp_ctx, tgs_authtime_nttime)));
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+
+ /* TODO: Should we check princ_name against account_name in
+ * logon_name ? Are they supposed to be identical, or can an
+ * account_name be different from the UPN ? */
+
+ status = get_user_from_kerberos_info(tmp_ctx, client_id->name,
+ princ_name, logon_info,
+ &is_mapped, &is_guest,
+ &ntuser, &ntdomain,
+ &username, &pw);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to map kerberos principal to system user "
+ "(%s)\n", nt_errstr(status)));
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+
+ /* TODO: save PAC data in netsamlogon cache ? */
+
+ status = make_server_info_krb5(mem_ctx,
+ ntuser, ntdomain, username, pw,
+ logon_info, is_guest, server_info);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
+ nt_errstr(status)));
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+
+ DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
+ ntuser, ntdomain, client_id->name));
+
+ status = NT_STATUS_OK;
+
+done:
+ TALLOC_FREE(tmp_ctx);
+ return status;
+}
git.samba.org / idra / samba.git / commitdiff