Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/sspi/sspi_gss.c

@@ -0,0 +1,120 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * Generic Security Service Application Program Interface (GSSAPI)
+ *
+ * Copyright 2015 ANSSI, Author Thomas Calderon
+ * Copyright 2015 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+ * Copyright 2017 Dorian Ducournau <dorian.ducournau@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <winpr/crt.h>
+#include <winpr/assert.h>
+#include <winpr/endian.h>
+#include <winpr/asn1.h>
+#include <winpr/stream.h>
+
+#include "sspi_gss.h"
+
+BOOL sspi_gss_wrap_token(SecBuffer* buf, const WinPrAsn1_OID* oid, uint16_t tok_id,
+                         const sspi_gss_data* token)
+{
+	WinPrAsn1Encoder* enc = nullptr;
+	BYTE tok_id_buf[2];
+	WinPrAsn1_MemoryChunk mc = { 2, tok_id_buf };
+	wStream s;
+	size_t len = 0;
+	BOOL ret = FALSE;
+
+	WINPR_ASSERT(buf);
+	WINPR_ASSERT(oid);
+	WINPR_ASSERT(token);
+
+	winpr_Data_Write_UINT16_BE(tok_id_buf, tok_id);
+
+	enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
+	if (!enc)
+		return FALSE;
+
+	/* initialContextToken [APPLICATION 0] */
+	if (!WinPrAsn1EncAppContainer(enc, 0))
+		goto cleanup;
+
+	/* thisMech OID */
+	if (!WinPrAsn1EncOID(enc, oid))
+		goto cleanup;
+
+	/* TOK_ID */
+	if (!WinPrAsn1EncRawContent(enc, &mc))
+		goto cleanup;
+
+	/* innerToken */
+	mc.data = (BYTE*)token->data;
+	mc.len = token->length;
+	if (!WinPrAsn1EncRawContent(enc, &mc))
+		goto cleanup;
+
+	if (!WinPrAsn1EncEndContainer(enc))
+		goto cleanup;
+
+	if (!WinPrAsn1EncStreamSize(enc, &len) || len > buf->cbBuffer)
+		goto cleanup;
+
+	Stream_StaticInit(&s, buf->pvBuffer, len);
+	if (WinPrAsn1EncToStream(enc, &s))
+	{
+		buf->cbBuffer = (UINT32)len;
+		ret = TRUE;
+	}
+
+cleanup:
+	WinPrAsn1Encoder_Free(&enc);
+	return ret;
+}
+
+BOOL sspi_gss_unwrap_token(const SecBuffer* buf, WinPrAsn1_OID* oid, uint16_t* tok_id,
+                           sspi_gss_data* token)
+{
+	WinPrAsn1Decoder dec = WinPrAsn1Decoder_init();
+	WinPrAsn1Decoder dec2 = WinPrAsn1Decoder_init();
+	WinPrAsn1_tagId tag = 0;
+	wStream sbuffer = WINPR_C_ARRAY_INIT;
+	wStream* s = nullptr;
+
+	WINPR_ASSERT(buf);
+	WINPR_ASSERT(oid);
+	WINPR_ASSERT(token);
+
+	WinPrAsn1Decoder_InitMem(&dec, WINPR_ASN1_DER, buf->pvBuffer, buf->cbBuffer);
+
+	if (!WinPrAsn1DecReadApp(&dec, &tag, &dec2) || tag != 0)
+		return FALSE;
+
+	if (!WinPrAsn1DecReadOID(&dec2, oid, FALSE))
+		return FALSE;
+
+	sbuffer = WinPrAsn1DecGetStream(&dec2);
+	s = &sbuffer;
+
+	if (Stream_Length(s) < 2)
+		return FALSE;
+
+	if (tok_id)
+		Stream_Read_UINT16_BE(s, *tok_id);
+
+	token->data = Stream_Pointer(s);
+	token->length = (UINT)Stream_GetRemainingLength(s);
+
+	return TRUE;
+}