gensec: move schannel module to toplevel.

Guenther

Signed-off-by: Günther Deschner <gd@samba.org>
Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

2 files changed, 338 insertions, 0 deletions

diff --git a/auth/gensec/schannel.c b/auth/gensec/schannel.c
new file mode 100644
index 0000000000..eb2e100e2e
--- /dev/null
+++ b/auth/gensec/schannel.c
@@ -0,0 +1,330 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   dcerpc schannel operations
+
+   Copyright (C) Andrew Tridgell 2004
+   Copyright (C) Andrew Bartlett <abartlet@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
+   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_schannel.h"
+#include "auth/auth.h"
+#include "auth/credentials/credentials.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+#include "auth/gensec/gensec_proto.h"
+#include "../libcli/auth/schannel.h"
+#include "librpc/gen_ndr/dcerpc.h"
+#include "param/param.h"
+#include "auth/gensec/gensec_toplevel_proto.h"
+
+_PUBLIC_ NTSTATUS gensec_schannel_init(void);
+
+static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
+{
+	struct schannel_state *state =
+		talloc_get_type_abort(gensec_security->private_data,
+		struct schannel_state);
+
+	return netsec_outgoing_sig_size(state);
+}
+
+static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
+				struct tevent_context *ev,
+				const DATA_BLOB in, DATA_BLOB *out)
+{
+	struct schannel_state *state =
+		talloc_get_type(gensec_security->private_data,
+		struct schannel_state);
+	NTSTATUS status;
+	enum ndr_err_code ndr_err;
+	struct NL_AUTH_MESSAGE bind_schannel;
+	struct NL_AUTH_MESSAGE bind_schannel_ack;
+	struct netlogon_creds_CredentialState *creds;
+	const char *workstation;
+	const char *domain;
+
+	*out = data_blob(NULL, 0);
+
+	switch (gensec_security->gensec_role) {
+	case GENSEC_CLIENT:
+		if (state != NULL) {
+			/* we could parse the bind ack, but we don't know what it is yet */
+			return NT_STATUS_OK;
+		}
+
+		creds = cli_credentials_get_netlogon_creds(gensec_security->credentials);
+		if (creds == NULL) {
+			return NT_STATUS_INVALID_PARAMETER_MIX;
+		}
+
+		state = netsec_create_state(gensec_security,
+					    creds, true /* initiator */);
+		if (state == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		gensec_security->private_data = state;
+
+		bind_schannel.MessageType = NL_NEGOTIATE_REQUEST;
+#if 0
+		/* to support this we'd need to have access to the full domain name */
+		/* 0x17, 23 */
+		bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
+				      NL_FLAG_OEM_NETBIOS_COMPUTER_NAME |
+				      NL_FLAG_UTF8_DNS_DOMAIN_NAME |
+				      NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME;
+		bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
+		bind_schannel.oem_netbios_computer.a = creds->computer_name;
+		bind_schannel.utf8_dns_domain = cli_credentials_get_realm(gensec_security->credentials);
+		/* w2k3 refuses us if we use the full DNS workstation?
+		 why? perhaps because we don't fill in the dNSHostName
+		 attribute in the machine account? */
+		bind_schannel.utf8_netbios_computer = creds->computer_name;
+#else
+		bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
+				      NL_FLAG_OEM_NETBIOS_COMPUTER_NAME;
+		bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
+		bind_schannel.oem_netbios_computer.a = creds->computer_name;
+#endif
+
+		ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
+					       (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			status = ndr_map_error2ntstatus(ndr_err);
+			DEBUG(3, ("Could not create schannel bind: %s\n",
+				  nt_errstr(status)));
+			return status;
+		}
+
+		return NT_STATUS_MORE_PROCESSING_REQUIRED;
+	case GENSEC_SERVER:
+
+		if (state != NULL) {
+			/* no third leg on this protocol */
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		/* parse the schannel startup blob */
+		ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
+			(ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			status = ndr_map_error2ntstatus(ndr_err);
+			DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
+				  nt_errstr(status)));
+			return status;
+		}
+
+		if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_DOMAIN_NAME) {
+			domain = bind_schannel.oem_netbios_domain.a;
+			if (strcasecmp_m(domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)) != 0) {
+				DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
+					  domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)));
+				return NT_STATUS_LOGON_FAILURE;
+			}
+		} else if (bind_schannel.Flags & NL_FLAG_UTF8_DNS_DOMAIN_NAME) {
+			domain = bind_schannel.utf8_dns_domain.u;
+			if (strcasecmp_m(domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)) != 0) {
+				DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
+					  domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)));
+				return NT_STATUS_LOGON_FAILURE;
+			}
+		} else {
+			DEBUG(3, ("Request for schannel to without domain\n"));
+			return NT_STATUS_LOGON_FAILURE;
+		}
+
+		if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME) {
+			workstation = bind_schannel.oem_netbios_computer.a;
+		} else if (bind_schannel.Flags & NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME) {
+			workstation = bind_schannel.utf8_netbios_computer.u;
+		} else {
+			DEBUG(3, ("Request for schannel to without netbios workstation\n"));
+			return NT_STATUS_LOGON_FAILURE;
+		}
+
+		status = schannel_get_creds_state(out_mem_ctx,
+						  gensec_security->settings->lp_ctx,
+						  workstation, &creds);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
+				  workstation, nt_errstr(status)));
+			if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
+				return NT_STATUS_LOGON_FAILURE;
+			}
+			return status;
+		}
+
+		state = netsec_create_state(gensec_security,
+					    creds, false /* not initiator */);
+		if (state == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+		gensec_security->private_data = state;
+
+		bind_schannel_ack.MessageType = NL_NEGOTIATE_RESPONSE;
+		bind_schannel_ack.Flags = 0;
+		bind_schannel_ack.Buffer.dummy = 0x6c0000; /* actually I think
+							    * this does not have
+							    * any meaning here
+							    * - gd */
+
+		ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
+					       (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			status = ndr_map_error2ntstatus(ndr_err);
+			DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
+				  workstation, nt_errstr(status)));
+			return status;
+		}
+
+		return NT_STATUS_OK;
+	}
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+/**
+ * Returns anonymous credentials for schannel, matching Win2k3.
+ *
+ */
+
+static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
+				      TALLOC_CTX *mem_ctx,
+				      struct auth_session_info **_session_info)
+{
+	return auth_anonymous_session_info(mem_ctx, gensec_security->settings->lp_ctx, _session_info);
+}
+
+static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
+{
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
+{
+	return NT_STATUS_OK;
+}
+
+static bool schannel_have_feature(struct gensec_security *gensec_security,
+					 uint32_t feature)
+{
+	if (feature & (GENSEC_FEATURE_SIGN |
+		       GENSEC_FEATURE_SEAL)) {
+		return true;
+	}
+	if (feature & GENSEC_FEATURE_DCE_STYLE) {
+		return true;
+	}
+	return false;
+}
+
+/*
+  unseal a packet
+*/
+static NTSTATUS schannel_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 schannel_state *state =
+		talloc_get_type_abort(gensec_security->private_data,
+		struct schannel_state);
+
+	return netsec_incoming_packet(state, true,
+				      discard_const_p(uint8_t, data),
+				      length, sig);
+}
+
+/*
+  check the signature on a packet
+*/
+static NTSTATUS schannel_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 schannel_state *state =
+		talloc_get_type_abort(gensec_security->private_data,
+		struct schannel_state);
+
+	return netsec_incoming_packet(state, false,
+				      discard_const_p(uint8_t, data),
+				      length, sig);
+}
+/*
+  seal a packet
+*/
+static NTSTATUS schannel_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 schannel_state *state =
+		talloc_get_type_abort(gensec_security->private_data,
+		struct schannel_state);
+
+	return netsec_outgoing_packet(state, mem_ctx, true,
+				      data, length, sig);
+}
+
+/*
+  sign a packet
+*/
+static NTSTATUS schannel_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 schannel_state *state =
+		talloc_get_type_abort(gensec_security->private_data,
+		struct schannel_state);
+
+	return netsec_outgoing_packet(state, mem_ctx, false,
+				      discard_const_p(uint8_t, data),
+				      length, sig);
+}
+
+static const struct gensec_security_ops gensec_schannel_security_ops = {
+	.name		= "schannel",
+	.auth_type	= DCERPC_AUTH_TYPE_SCHANNEL,
+	.client_start   = schannel_client_start,
+	.server_start   = schannel_server_start,
+	.update 	= schannel_update,
+	.seal_packet 	= schannel_seal_packet,
+	.sign_packet   	= schannel_sign_packet,
+	.check_packet	= schannel_check_packet,
+	.unseal_packet 	= schannel_unseal_packet,
+	.session_info	= schannel_session_info,
+	.sig_size	= schannel_sig_size,
+	.have_feature   = schannel_have_feature,
+	.enabled        = true,
+	.priority       = GENSEC_SCHANNEL
+};
+
+_PUBLIC_ NTSTATUS gensec_schannel_init(void)
+{
+	NTSTATUS ret;
+	ret = gensec_register(&gensec_schannel_security_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			gensec_schannel_security_ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/auth/gensec/wscript_build b/auth/gensec/wscript_build
index 71222f7b26..7329eec99e 100755
--- a/auth/gensec/wscript_build
+++ b/auth/gensec/wscript_build
@@ -17,6 +17,14 @@ bld.SAMBA_MODULE('gensec_spnego',
 	deps='asn1util samba-credentials SPNEGO_PARSE'
 	)
 
+bld.SAMBA_MODULE('gensec_schannel',
+	source='schannel.c',
+	autoproto='schannel_proto.h',
+	subsystem='gensec',
+	init_function='gensec_schannel_init',
+	deps='COMMON_SCHANNEL NDR_SCHANNEL samba-credentials auth_session'
+	)
+
 bld.SAMBA_MODULE('gensec_external',
 	source='external.c',
 	autoproto='external_proto.h',