105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* ASN1 routines for RDPEAR
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*
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* Copyright 2024 David Fort <contact@hardening-consulting.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <rdpear-common/rdpear_asn1.h>
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#include <winpr/asn1.h>
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wStream* rdpear_enc_Checksum(UINT32 cksumtype, krb5_checksum* csum)
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{
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/**
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* Checksum ::= SEQUENCE {
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* cksumtype [0] Int32,
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* checksum [1] OCTET STRING
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* }
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*/
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wStream* ret = nullptr;
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WinPrAsn1Encoder* enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
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if (!enc)
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return nullptr;
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if (!WinPrAsn1EncSeqContainer(enc))
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goto out;
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if (!WinPrAsn1EncContextualInteger(enc, 0, (WinPrAsn1_INTEGER)cksumtype))
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goto out;
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WinPrAsn1_OctetString octets;
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octets.data = (BYTE*)csum->contents;
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octets.len = csum->length;
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if (!WinPrAsn1EncContextualOctetString(enc, 1, &octets) || !WinPrAsn1EncEndContainer(enc))
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goto out;
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ret = Stream_New(nullptr, 1024);
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if (!ret)
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goto out;
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if (!WinPrAsn1EncToStream(enc, ret))
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{
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Stream_Free(ret, TRUE);
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ret = nullptr;
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goto out;
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}
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out:
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WinPrAsn1Encoder_Free(&enc);
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return ret;
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}
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wStream* rdpear_enc_EncryptedData(UINT32 encType, krb5_data* payload)
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{
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/**
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* EncryptedData ::= SEQUENCE {
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* etype [0] Int32 -- EncryptionType --,
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* kvno [1] UInt32 OPTIONAL,
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* cipher [2] OCTET STRING -- ciphertext
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* }
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*/
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wStream* ret = nullptr;
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WinPrAsn1Encoder* enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
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if (!enc)
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return nullptr;
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if (!WinPrAsn1EncSeqContainer(enc))
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goto out;
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if (!WinPrAsn1EncContextualInteger(enc, 0, (WinPrAsn1_INTEGER)encType))
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goto out;
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WinPrAsn1_OctetString octets;
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octets.data = (BYTE*)payload->data;
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octets.len = payload->length;
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if (!WinPrAsn1EncContextualOctetString(enc, 2, &octets) || !WinPrAsn1EncEndContainer(enc))
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goto out;
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ret = Stream_New(nullptr, 1024);
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if (!ret)
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goto out;
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if (!WinPrAsn1EncToStream(enc, ret))
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{
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Stream_Free(ret, TRUE);
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ret = nullptr;
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goto out;
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}
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out:
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WinPrAsn1Encoder_Free(&enc);
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return ret;
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}
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