mirror of https://github.com/acidanthera/audk.git
144 lines
4.3 KiB
C
144 lines
4.3 KiB
C
/** @file
|
|
Authenticode Portable Executable Signature Verification over OpenSSL.
|
|
|
|
Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials
|
|
are licensed and made available under the terms and conditions of the BSD License
|
|
which accompanies this distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
**/
|
|
|
|
#include "InternalCryptLib.h"
|
|
|
|
#include <openssl/objects.h>
|
|
#include <openssl/x509.h>
|
|
#include <openssl/pkcs7.h>
|
|
|
|
|
|
/**
|
|
Verifies the validility of a PE/COFF Authenticode Signature as described in "Windows
|
|
Authenticode Portable Executable Signature Format".
|
|
|
|
If AuthData is NULL, then ASSERT().
|
|
If ImageHash is NULL, then ASSERT().
|
|
|
|
@param[in] AuthData Pointer to the Authenticode Signature retrieved from signed
|
|
PE/COFF image to be verified.
|
|
@param[in] DataSize Size of the Authenticode Signature in bytes.
|
|
@param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which
|
|
is used for certificate chain verification.
|
|
@param[in] CertSize Size of the trusted certificate in bytes.
|
|
@param[in] ImageHash Pointer to the original image file hash value. The procudure
|
|
for calculating the image hash value is described in Authenticode
|
|
specification.
|
|
@param[in] HashSize Size of Image hash value in bytes.
|
|
|
|
@retval TRUE The specified Authenticode Signature is valid.
|
|
@retval FALSE Invalid Authenticode Signature.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
AuthenticodeVerify (
|
|
IN CONST UINT8 *AuthData,
|
|
IN UINTN DataSize,
|
|
IN CONST UINT8 *TrustedCert,
|
|
IN UINTN CertSize,
|
|
IN CONST UINT8 *ImageHash,
|
|
IN UINTN HashSize
|
|
)
|
|
{
|
|
BOOLEAN Status;
|
|
PKCS7 *Pkcs7;
|
|
CONST UINT8 *OrigAuthData;
|
|
UINT8 *SpcIndirectDataContent;
|
|
UINT8 Asn1Byte;
|
|
UINTN ContentSize;
|
|
|
|
//
|
|
// ASSERT if Authenticode Signature Data or PE Image Hash is NULL
|
|
//
|
|
ASSERT (AuthData != NULL);
|
|
ASSERT (ImageHash != NULL);
|
|
|
|
Status = FALSE;
|
|
Pkcs7 = NULL;
|
|
OrigAuthData = AuthData;
|
|
|
|
//
|
|
// Retrieve & Parse PKCS#7 Data (DER encoding) from Authenticode Signature
|
|
//
|
|
Pkcs7 = d2i_PKCS7 (NULL, &AuthData, (int)DataSize);
|
|
if (Pkcs7 == NULL) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Check if it's PKCS#7 Signed Data (for Authenticode Scenario)
|
|
//
|
|
if (!PKCS7_type_is_signed (Pkcs7)) {
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// NOTE: OpenSSL PKCS7 Decoder didn't work for Authenticode-format signed data due to
|
|
// some authenticode-specific structure. Use opaque ASN.1 string to retrieve
|
|
// PKCS#7 ContentInfo here.
|
|
//
|
|
SpcIndirectDataContent = (UINT8 *)(Pkcs7->d.sign->contents->d.other->value.asn1_string->data);
|
|
|
|
//
|
|
// Retrieve the SEQUENCE data size from ASN.1-encoded SpcIndirectDataContent.
|
|
//
|
|
Asn1Byte = *(SpcIndirectDataContent + 1);
|
|
if ((Asn1Byte & 0x80) == 0) {
|
|
//
|
|
// Short Form of Length Encoding
|
|
//
|
|
ContentSize = (UINTN) (Asn1Byte & 0x7F);
|
|
//
|
|
// Skip the SEQUENCE Tag;
|
|
//
|
|
SpcIndirectDataContent += 2;
|
|
} else {
|
|
//
|
|
// Long Form of Length Encoding (Assume Only two bytes here)
|
|
//
|
|
ContentSize = (UINTN) (*(SpcIndirectDataContent + 2));
|
|
ContentSize = (ContentSize << 8) + (UINTN)(*(SpcIndirectDataContent + 3));
|
|
//
|
|
// Skip the SEQUENCE Tag;
|
|
//
|
|
SpcIndirectDataContent += 4;
|
|
}
|
|
|
|
//
|
|
// Compare the original file hash value to the digest retrieve from SpcIndirectDataContent
|
|
// defined in Authenticode
|
|
// NOTE: Need to double-check HashLength here!
|
|
//
|
|
if (CompareMem (SpcIndirectDataContent + ContentSize - HashSize, ImageHash, HashSize) != 0) {
|
|
//
|
|
// Un-matched PE/COFF Hash Value
|
|
//
|
|
goto _Exit;
|
|
}
|
|
|
|
//
|
|
// Verifies the PKCS#7 Signed Data in PE/COFF Authenticode Signature
|
|
//
|
|
Status = (BOOLEAN) Pkcs7Verify (OrigAuthData, DataSize, TrustedCert, CertSize, SpcIndirectDataContent, ContentSize);
|
|
|
|
_Exit:
|
|
//
|
|
// Release Resources
|
|
//
|
|
PKCS7_free (Pkcs7);
|
|
|
|
return Status;
|
|
}
|