1. Remove conducting ASSERT in BaseCryptLib.

[mirror_edk2.git] / CryptoPkg / Library / BaseCryptLib / Pk / CryptAuthenticode.c

/** @file\r
  Authenticode Portable Executable Signature Verification over OpenSSL.\r
\r
Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "InternalCryptLib.h"\r
\r
#include <openssl/objects.h>\r
#include <openssl/x509.h>\r
#include <openssl/pkcs7.h>\r
\r
\r
/**\r
  Verifies the validility of a PE/COFF Authenticode Signature as described in "Windows\r
  Authenticode Portable Executable Signature Format".\r
\r
  If AuthData is NULL, then return FALSE.\r
  If ImageHash is NULL, then return FALSE.\r
\r
  @param[in]  AuthData     Pointer to the Authenticode Signature retrieved from signed\r
                           PE/COFF image to be verified.\r
  @param[in]  DataSize     Size of the Authenticode Signature in bytes.\r
  @param[in]  TrustedCert  Pointer to a trusted/root certificate encoded in DER, which\r
                           is used for certificate chain verification.\r
  @param[in]  CertSize     Size of the trusted certificate in bytes.\r
  @param[in]  ImageHash    Pointer to the original image file hash value. The procudure\r
                           for calculating the image hash value is described in Authenticode\r
                           specification.\r
  @param[in]  HashSize     Size of Image hash value in bytes.\r
\r
  @retval  TRUE   The specified Authenticode Signature is valid.\r
  @retval  FALSE  Invalid Authenticode Signature.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
AuthenticodeVerify (\r
  IN  CONST UINT8  *AuthData,\r
  IN  UINTN        DataSize,\r
  IN  CONST UINT8  *TrustedCert,\r
  IN  UINTN        CertSize,\r
  IN  CONST UINT8  *ImageHash,\r
  IN  UINTN        HashSize\r
  )\r
{\r
  BOOLEAN      Status;\r
  PKCS7        *Pkcs7;\r
  CONST UINT8  *OrigAuthData;\r
  UINT8        *SpcIndirectDataContent;\r
  UINT8        Asn1Byte;\r
  UINTN        ContentSize;\r
\r
  //\r
  // Check input parameters.\r
  //\r
  if ((AuthData == NULL) || (TrustedCert == NULL) || (ImageHash == NULL)) {\r
    return FALSE;\r
  }\r
\r
  if ((DataSize > INT_MAX) || (CertSize > INT_MAX) || (HashSize > INT_MAX)) {\r
    return FALSE;\r
  }\r
\r
  Status       = FALSE;\r
  Pkcs7        = NULL;\r
  OrigAuthData = AuthData;\r
\r
  //\r
  // Retrieve & Parse PKCS#7 Data (DER encoding) from Authenticode Signature\r
  //\r
  Pkcs7 = d2i_PKCS7 (NULL, &AuthData, (int)DataSize);\r
  if (Pkcs7 == NULL) {\r
    goto _Exit;\r
  }\r
\r
  //\r
  // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)\r
  //\r
  if (!PKCS7_type_is_signed (Pkcs7)) {\r
    goto _Exit;\r
  }\r
\r
  //\r
  // NOTE: OpenSSL PKCS7 Decoder didn't work for Authenticode-format signed data due to\r
  //       some authenticode-specific structure. Use opaque ASN.1 string to retrieve\r
  //       PKCS#7 ContentInfo here.\r
  //\r
  SpcIndirectDataContent = (UINT8 *)(Pkcs7->d.sign->contents->d.other->value.asn1_string->data);\r
\r
  //\r
  // Retrieve the SEQUENCE data size from ASN.1-encoded SpcIndirectDataContent.\r
  //\r
  Asn1Byte = *(SpcIndirectDataContent + 1);\r
\r
  if ((Asn1Byte & 0x80) == 0) {\r
    //\r
    // Short Form of Length Encoding\r
    //\r
    ContentSize = (UINTN) (Asn1Byte & 0x7F);\r
    //\r
    // Skip the SEQUENCE Tag;\r
    //\r
    SpcIndirectDataContent += 2;\r
  } else if ((Asn1Byte & 0x82) == 0x82) {\r
    //\r
    // Long Form of Length Encoding, only support two bytes.\r
    //\r
    ContentSize  = (UINTN) (*(SpcIndirectDataContent + 2));\r
    ContentSize = (ContentSize << 8) + (UINTN)(*(SpcIndirectDataContent + 3));\r
    //\r
    // Skip the SEQUENCE Tag;\r
    //\r
    SpcIndirectDataContent += 4;\r
  } else {\r
    goto _Exit;\r
  }\r
\r
  //\r
  // Compare the original file hash value to the digest retrieve from SpcIndirectDataContent\r
  // defined in Authenticode\r
  // NOTE: Need to double-check HashLength here!\r
  //\r
  if (CompareMem (SpcIndirectDataContent + ContentSize - HashSize, ImageHash, HashSize) != 0) {\r
    //\r
    // Un-matched PE/COFF Hash Value\r
    //\r
    goto _Exit;\r
  }\r
\r
  //\r
  // Verifies the PKCS#7 Signed Data in PE/COFF Authenticode Signature\r
  //\r
  Status = (BOOLEAN) Pkcs7Verify (OrigAuthData, DataSize, TrustedCert, CertSize, SpcIndirectDataContent, ContentSize);\r
\r
_Exit:\r
  //\r
  // Release Resources\r
  //\r
  PKCS7_free (Pkcs7);\r
\r
  return Status;\r
}\r