* GSSAPI Security Extensions
* RPC Pipe client and server routines
* Copyright (C) Simo Sorce 2010.
+ * Copyright (C) Andrew Bartlett 2004-2011.
+ * Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
*
* 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
#include "includes.h"
#include "gse.h"
#include "libads/kerberos_proto.h"
+#include "auth/common_auth.h"
+#include "auth/gensec/gensec.h"
+#include "auth/credentials/credentials.h"
+#include "../librpc/gen_ndr/dcerpc.h"
#if defined(HAVE_KRB5) && defined(HAVE_GSS_WRAP_IOV)
return status;
}
+static NTSTATUS gensec_gse_client_start(struct gensec_security *gensec_security)
+{
+ struct gse_context *gse_ctx;
+ struct cli_credentials *creds = gensec_get_credentials(gensec_security);
+ NTSTATUS nt_status;
+ OM_uint32 want_flags = 0;
+ bool do_sign = false, do_seal = false;
+ const char *hostname = gensec_get_target_hostname(gensec_security);
+ const char *service = gensec_get_target_service(gensec_security);
+ const char *username = cli_credentials_get_username(creds);
+ const char *password = cli_credentials_get_password(creds);
+
+ if (!hostname) {
+ DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (is_ipaddress(hostname)) {
+ DEBUG(2, ("Cannot do GSE to an IP address\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ if (strcmp(hostname, "localhost") == 0) {
+ DEBUG(2, ("GSE to 'localhost' does not make sense\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+ do_sign = true;
+ }
+ if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+ do_seal = true;
+ }
+ if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
+ want_flags |= GSS_C_DCE_STYLE;
+ }
+
+ nt_status = gse_init_client(gensec_security, do_sign, do_seal, NULL,
+ hostname, service,
+ username, password, want_flags,
+ &gse_ctx);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
+ }
+ gensec_security->private_data = gse_ctx;
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gse_server_start(struct gensec_security *gensec_security)
+{
+ struct gse_context *gse_ctx;
+ NTSTATUS nt_status;
+ OM_uint32 want_flags = 0;
+ bool do_sign = false, do_seal = false;
+
+ if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+ do_sign = true;
+ }
+ if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+ do_seal = true;
+ }
+ if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
+ want_flags |= GSS_C_DCE_STYLE;
+ }
+
+ nt_status = gse_init_server(gensec_security, do_sign, do_seal, want_flags,
+ &gse_ctx);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
+ }
+ gensec_security->private_data = gse_ctx;
+ return NT_STATUS_OK;
+}
+
+/**
+ * Check if the packet is one for this mechansim
+ *
+ * @param gensec_security GENSEC state
+ * @param in The request, as a DATA_BLOB
+ * @return Error, INVALID_PARAMETER if it's not a packet for us
+ * or NT_STATUS_OK if the packet is ok.
+ */
+
+static NTSTATUS gensec_gse_magic(struct gensec_security *gensec_security,
+ const DATA_BLOB *in)
+{
+ if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
+ return NT_STATUS_OK;
+ } else {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+}
+
+
+/**
+ * Next state function for the GSE GENSEC mechanism
+ *
+ * @param gensec_gse_state GSE State
+ * @param mem_ctx The TALLOC_CTX for *out to be allocated on
+ * @param in The request, as a DATA_BLOB
+ * @param out The reply, as an talloc()ed DATA_BLOB, on *mem_ctx
+ * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
+ * or NT_STATUS_OK if the user is authenticated.
+ */
+
+static NTSTATUS gensec_gse_update(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ const DATA_BLOB in, DATA_BLOB *out)
+{
+ NTSTATUS status;
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+
+ switch (gensec_security->gensec_role) {
+ case GENSEC_CLIENT:
+ status = gse_get_client_auth_token(mem_ctx, gse_ctx,
+ &in, out);
+ break;
+ case GENSEC_SERVER:
+ status = gse_get_server_auth_token(mem_ctx, gse_ctx,
+ &in, out);
+ break;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ if (gse_ctx->more_processing) {
+ return NT_STATUS_MORE_PROCESSING_REQUIRED;
+ }
+
+ if (gensec_security->gensec_role == GENSEC_SERVER) {
+ return gse_verify_server_auth_flags(gse_ctx);
+ }
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gse_wrap(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ const DATA_BLOB *in,
+ DATA_BLOB *out)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ OM_uint32 maj_stat, min_stat;
+ gss_buffer_desc input_token, output_token;
+ int conf_state;
+ input_token.length = in->length;
+ input_token.value = in->data;
+
+ maj_stat = gss_wrap(&min_stat,
+ gse_ctx->gss_ctx,
+ gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
+ GSS_C_QOP_DEFAULT,
+ &input_token,
+ &conf_state,
+ &output_token);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(0, ("gensec_gse_wrap: GSS Wrap failed: %s\n",
+ gse_errstr(talloc_tos(), maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat, &output_token);
+
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+ && !conf_state) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gse_unwrap(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ const DATA_BLOB *in,
+ DATA_BLOB *out)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ OM_uint32 maj_stat, min_stat;
+ gss_buffer_desc input_token, output_token;
+ int conf_state;
+ gss_qop_t qop_state;
+ input_token.length = in->length;
+ input_token.value = in->data;
+
+ maj_stat = gss_unwrap(&min_stat,
+ gse_ctx->gss_ctx,
+ &input_token,
+ &output_token,
+ &conf_state,
+ &qop_state);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(0, ("gensec_gse_unwrap: GSS UnWrap failed: %s\n",
+ gse_errstr(talloc_tos(), maj_stat, min_stat)));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
+ gss_release_buffer(&min_stat, &output_token);
+
+ if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
+ && !conf_state) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_gse_seal_packet(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ uint8_t *data, size_t length,
+ const uint8_t *whole_pdu, size_t pdu_length,
+ DATA_BLOB *sig)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ DATA_BLOB payload = data_blob_const(data, length);
+ return gse_seal(mem_ctx, gse_ctx, &payload, sig);
+}
+
+static NTSTATUS gensec_gse_unseal_packet(struct gensec_security *gensec_security,
+ uint8_t *data, size_t length,
+ const uint8_t *whole_pdu, size_t pdu_length,
+ const DATA_BLOB *sig)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ DATA_BLOB payload = data_blob_const(data, length);
+ return gse_unseal(talloc_tos() /* unused */, gse_ctx, &payload, sig);
+}
+
+static NTSTATUS gensec_gse_sign_packet(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ const uint8_t *data, size_t length,
+ const uint8_t *whole_pdu, size_t pdu_length,
+ DATA_BLOB *sig)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ DATA_BLOB payload = data_blob_const(data, length);
+ return gse_sign(mem_ctx, gse_ctx, &payload, sig);
+}
+
+static NTSTATUS gensec_gse_check_packet(struct gensec_security *gensec_security,
+ const uint8_t *data, size_t length,
+ const uint8_t *whole_pdu, size_t pdu_length,
+ const DATA_BLOB *sig)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ DATA_BLOB payload = data_blob_const(data, length);
+ return gse_sigcheck(NULL, gse_ctx, &payload, sig);
+}
+
+/* Try to figure out what features we actually got on the connection */
+static bool gensec_gse_have_feature(struct gensec_security *gensec_security,
+ uint32_t feature)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+
+ if (feature & GENSEC_FEATURE_SIGN) {
+ return gse_ctx->ret_flags & GSS_C_INTEG_FLAG;
+ }
+ if (feature & GENSEC_FEATURE_SEAL) {
+ return gse_ctx->ret_flags & GSS_C_CONF_FLAG;
+ }
+ if (feature & GENSEC_FEATURE_SESSION_KEY) {
+ /* Only for GSE/Krb5 */
+ if (gss_oid_equal(gse_ctx->ret_mech, gss_mech_krb5)) {
+ return true;
+ }
+ }
+ if (feature & GENSEC_FEATURE_DCE_STYLE) {
+ return gse_ctx->ret_flags & GSS_C_DCE_STYLE;
+ }
+ /* We can always do async (rather than strict request/reply) packets. */
+ if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
+ return true;
+ }
+ return false;
+}
+
+/*
+ * Extract the 'sesssion key' needed by SMB signing and ncacn_np
+ * (for encrypting some passwords).
+ *
+ * This breaks all the abstractions, but what do you expect...
+ */
+static NTSTATUS gensec_gse_session_key(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ DATA_BLOB *session_key_out)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+
+ DATA_BLOB session_key = gse_get_session_key(mem_ctx, gse_ctx);
+ if (session_key.data == NULL) {
+ return NT_STATUS_NO_USER_SESSION_KEY;
+ }
+
+ *session_key_out = session_key;
+
+ return NT_STATUS_OK;
+}
+
+/* Get some basic (and authorization) information about the user on
+ * this session. This uses either the PAC (if present) or a local
+ * database lookup */
+static NTSTATUS gensec_gse_session_info(struct gensec_security *gensec_security,
+ TALLOC_CTX *mem_ctx,
+ struct auth_session_info **_session_info)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+ NTSTATUS nt_status;
+ TALLOC_CTX *tmp_ctx;
+ struct auth_session_info *session_info = NULL;
+ OM_uint32 maj_stat, min_stat;
+ DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
+
+ gss_buffer_desc name_token;
+ char *principal_string;
+
+ tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gse_session_info context");
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+ maj_stat = gss_display_name(&min_stat,
+ gse_ctx->client_name,
+ &name_token,
+ NULL);
+ if (GSS_ERROR(maj_stat)) {
+ DEBUG(1, ("GSS display_name failed: %s\n",
+ gse_errstr(talloc_tos(), maj_stat, min_stat)));
+ talloc_free(tmp_ctx);
+ return NT_STATUS_FOOBAR;
+ }
+
+ principal_string = talloc_strndup(tmp_ctx,
+ (const char *)name_token.value,
+ name_token.length);
+
+ gss_release_buffer(&min_stat, &name_token);
+
+ if (!principal_string) {
+ talloc_free(tmp_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ nt_status = gssapi_obtain_pac_blob(tmp_ctx, gse_ctx->gss_ctx,
+ gse_ctx->client_name,
+ &pac_blob);
+
+ /* IF we have the PAC - otherwise we need to get this
+ * data from elsewere
+ */
+ if (NT_STATUS_IS_OK(nt_status)) {
+ pac_blob_ptr = &pac_blob;
+ }
+ nt_status = gensec_generate_session_info_pac(tmp_ctx,
+ gensec_security,
+ NULL,
+ pac_blob_ptr, principal_string,
+ gensec_get_remote_address(gensec_security),
+ &session_info);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(tmp_ctx);
+ return nt_status;
+ }
+
+ nt_status = gensec_gse_session_key(gensec_security, session_info,
+ &session_info->session_key);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(tmp_ctx);
+ return nt_status;
+ }
+
+ *_session_info = talloc_move(mem_ctx, &session_info);
+ talloc_free(tmp_ctx);
+
+ return NT_STATUS_OK;
+}
+
+static size_t gensec_gse_sig_size(struct gensec_security *gensec_security,
+ size_t data_size)
+{
+ struct gse_context *gse_ctx =
+ talloc_get_type_abort(gensec_security->private_data,
+ struct gse_context);
+
+ return gse_get_signature_length(gse_ctx,
+ gensec_security->want_features & GENSEC_FEATURE_SEAL,
+ data_size);
+}
+
+static const char *gensec_gse_krb5_oids[] = {
+ GENSEC_OID_KERBEROS5_OLD,
+ GENSEC_OID_KERBEROS5,
+ NULL
+};
+
+static const struct gensec_security_ops gensec_gse_krb5_security_ops = {
+ .name = "gse_krb5",
+ .auth_type = DCERPC_AUTH_TYPE_KRB5,
+ .oid = gensec_gse_krb5_oids,
+ .client_start = gensec_gse_client_start,
+ .server_start = gensec_gse_server_start,
+ .magic = gensec_gse_magic,
+ .update = gensec_gse_update,
+ .session_key = gensec_gse_session_key,
+ .session_info = gensec_gse_session_info,
+ .sig_size = gensec_gse_sig_size,
+ .sign_packet = gensec_gse_sign_packet,
+ .check_packet = gensec_gse_check_packet,
+ .seal_packet = gensec_gse_seal_packet,
+ .unseal_packet = gensec_gse_unseal_packet,
+ .wrap = gensec_gse_wrap,
+ .unwrap = gensec_gse_unwrap,
+ .have_feature = gensec_gse_have_feature,
+ .enabled = true,
+ .kerberos = true,
+ .priority = GENSEC_GSSAPI
+};
+
#else
NTSTATUS gse_init_client(TALLOC_CTX *mem_ctx,
git.samba.org / metze / samba / wip.git / commitdiff