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2 Authenticode Portable Executable Signature Verification over OpenSSL.
4 Caution: This module requires additional review when modified.
5 This library will have external input - signature (e.g. PE/COFF Authenticode).
6 This external input must be validated carefully to avoid security issue like
7 buffer overflow, integer overflow.
9 AuthenticodeVerify() will get PE/COFF Authenticode and will do basic check for
12 Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>
13 This program and the accompanying materials
14 are licensed and made available under the terms and conditions of the BSD License
15 which accompanies this distribution. The full text of the license may be found at
16 http://opensource.org/licenses/bsd-license.php
18 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
19 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
23 #include "InternalCryptLib.h"
25 #include <openssl/objects.h>
26 #include <openssl/x509.h>
27 #include <openssl/pkcs7.h>
31 Verifies the validility of a PE/COFF Authenticode Signature as described in "Windows
32 Authenticode Portable Executable Signature Format".
34 If AuthData is NULL, then return FALSE.
35 If ImageHash is NULL, then return FALSE.
37 Caution: This function may receive untrusted input.
38 PE/COFF Authenticode is external input, so this function will do basic check for
39 Authenticode data structure.
41 @param[in] AuthData Pointer to the Authenticode Signature retrieved from signed
42 PE/COFF image to be verified.
43 @param[in] DataSize Size of the Authenticode Signature in bytes.
44 @param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which
45 is used for certificate chain verification.
46 @param[in] CertSize Size of the trusted certificate in bytes.
47 @param[in] ImageHash Pointer to the original image file hash value. The procudure
48 for calculating the image hash value is described in Authenticode
50 @param[in] HashSize Size of Image hash value in bytes.
52 @retval TRUE The specified Authenticode Signature is valid.
53 @retval FALSE Invalid Authenticode Signature.
59 IN CONST UINT8
*AuthData
,
61 IN CONST UINT8
*TrustedCert
,
63 IN CONST UINT8
*ImageHash
,
69 CONST UINT8
*OrigAuthData
;
70 UINT8
*SpcIndirectDataContent
;
75 // Check input parameters.
77 if ((AuthData
== NULL
) || (TrustedCert
== NULL
) || (ImageHash
== NULL
)) {
81 if ((DataSize
> INT_MAX
) || (CertSize
> INT_MAX
) || (HashSize
> INT_MAX
)) {
87 OrigAuthData
= AuthData
;
90 // Retrieve & Parse PKCS#7 Data (DER encoding) from Authenticode Signature
92 Pkcs7
= d2i_PKCS7 (NULL
, &AuthData
, (int)DataSize
);
98 // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)
100 if (!PKCS7_type_is_signed (Pkcs7
)) {
105 // NOTE: OpenSSL PKCS7 Decoder didn't work for Authenticode-format signed data due to
106 // some authenticode-specific structure. Use opaque ASN.1 string to retrieve
107 // PKCS#7 ContentInfo here.
109 SpcIndirectDataContent
= (UINT8
*)(Pkcs7
->d
.sign
->contents
->d
.other
->value
.asn1_string
->data
);
112 // Retrieve the SEQUENCE data size from ASN.1-encoded SpcIndirectDataContent.
114 Asn1Byte
= *(SpcIndirectDataContent
+ 1);
116 if ((Asn1Byte
& 0x80) == 0) {
118 // Short Form of Length Encoding
120 ContentSize
= (UINTN
) (Asn1Byte
& 0x7F);
122 // Skip the SEQUENCE Tag;
124 SpcIndirectDataContent
+= 2;
125 } else if ((Asn1Byte
& 0x82) == 0x82) {
127 // Long Form of Length Encoding, only support two bytes.
129 ContentSize
= (UINTN
) (*(SpcIndirectDataContent
+ 2));
130 ContentSize
= (ContentSize
<< 8) + (UINTN
)(*(SpcIndirectDataContent
+ 3));
132 // Skip the SEQUENCE Tag;
134 SpcIndirectDataContent
+= 4;
140 // Compare the original file hash value to the digest retrieve from SpcIndirectDataContent
141 // defined in Authenticode
142 // NOTE: Need to double-check HashLength here!
144 if (CompareMem (SpcIndirectDataContent
+ ContentSize
- HashSize
, ImageHash
, HashSize
) != 0) {
146 // Un-matched PE/COFF Hash Value
152 // Verifies the PKCS#7 Signed Data in PE/COFF Authenticode Signature
154 Status
= (BOOLEAN
) Pkcs7Verify (OrigAuthData
, DataSize
, TrustedCert
, CertSize
, SpcIndirectDataContent
, ContentSize
);