mirror of https://github.com/acidanthera/audk.git
237 lines
9.0 KiB
Python
237 lines
9.0 KiB
Python
## @file
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# This tool encodes and decodes GUIDed FFS sections or FMP capsule for a GUID type of
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# EFI_CERT_TYPE_RSA2048_SHA256_GUID defined in the UEFI 2.4 Specification as
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# {0xa7717414, 0xc616, 0x4977, {0x94, 0x20, 0x84, 0x47, 0x12, 0xa7, 0x35, 0xbf}}
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# This tool has been tested with OpenSSL 1.0.1e 11 Feb 2013
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#
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# Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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'''
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Rsa2048Sha256Sign
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'''
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import os
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import sys
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import argparse
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import subprocess
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import uuid
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import struct
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import collections
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from Common.BuildVersion import gBUILD_VERSION
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#
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# Globals for help information
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#
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__prog__ = 'Rsa2048Sha256Sign'
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__version__ = '%s Version %s' % (__prog__, '0.9 ' + gBUILD_VERSION)
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__copyright__ = 'Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.'
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__usage__ = '%s -e|-d [options] <input_file>' % (__prog__)
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#
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# GUID for SHA 256 Hash Algorithm from UEFI Specification
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#
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EFI_HASH_ALGORITHM_SHA256_GUID = uuid.UUID('{51aa59de-fdf2-4ea3-bc63-875fb7842ee9}')
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#
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# Structure defintion to unpack EFI_CERT_BLOCK_RSA_2048_SHA256 from UEFI 2.4 Specification
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#
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# typedef struct _EFI_CERT_BLOCK_RSA_2048_SHA256 {
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# EFI_GUID HashType;
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# UINT8 PublicKey[256];
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# UINT8 Signature[256];
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# } EFI_CERT_BLOCK_RSA_2048_SHA256;
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#
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EFI_CERT_BLOCK_RSA_2048_SHA256 = collections.namedtuple('EFI_CERT_BLOCK_RSA_2048_SHA256', ['HashType','PublicKey','Signature'])
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EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT = struct.Struct('16s256s256s')
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#
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# Filename of test signing private key that is stored in same directory as this tool
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#
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TEST_SIGNING_PRIVATE_KEY_FILENAME = 'TestSigningPrivateKey.pem'
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if __name__ == '__main__':
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#
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# Create command line argument parser object
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#
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parser = argparse.ArgumentParser(prog=__prog__, version=__version__, usage=__usage__, description=__copyright__, conflict_handler='resolve')
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument("-e", action="store_true", dest='Encode', help='encode file')
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group.add_argument("-d", action="store_true", dest='Decode', help='decode file')
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parser.add_argument("-o", "--output", dest='OutputFile', type=str, metavar='filename', help="specify the output filename", required=True)
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parser.add_argument("--monotonic-count", dest='MonotonicCountStr', type=str, help="specify the MonotonicCount in FMP capsule.")
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parser.add_argument("--private-key", dest='PrivateKeyFile', type=argparse.FileType('rb'), help="specify the private key filename. If not specified, a test signing key is used.")
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parser.add_argument("-v", "--verbose", dest='Verbose', action="store_true", help="increase output messages")
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parser.add_argument("-q", "--quiet", dest='Quiet', action="store_true", help="reduce output messages")
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parser.add_argument("--debug", dest='Debug', type=int, metavar='[0-9]', choices=range(0,10), default=0, help="set debug level")
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parser.add_argument(metavar="input_file", dest='InputFile', type=argparse.FileType('rb'), help="specify the input filename")
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#
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# Parse command line arguments
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#
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args = parser.parse_args()
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#
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# Generate file path to Open SSL command
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#
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OpenSslCommand = 'openssl'
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try:
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OpenSslPath = os.environ['OPENSSL_PATH']
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OpenSslCommand = os.path.join(OpenSslPath, OpenSslCommand)
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except:
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pass
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#
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# Verify that Open SSL command is available
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#
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try:
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Process = subprocess.Popen('%s version' % (OpenSslCommand), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except:
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print 'ERROR: Open SSL command not available. Please verify PATH or set OPENSSL_PATH'
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sys.exit(1)
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Version = Process.communicate()
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if Process.returncode <> 0:
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print 'ERROR: Open SSL command not available. Please verify PATH or set OPENSSL_PATH'
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sys.exit(Process.returncode)
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print Version[0]
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#
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# Read input file into a buffer and save input filename
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#
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args.InputFileName = args.InputFile.name
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args.InputFileBuffer = args.InputFile.read()
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args.InputFile.close()
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#
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# Save output filename and check if path exists
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#
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OutputDir = os.path.dirname(args.OutputFile)
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if not os.path.exists(OutputDir):
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print 'ERROR: The output path does not exist: %s' % OutputDir
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sys.exit(1)
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args.OutputFileName = args.OutputFile
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#
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# Save private key filename and close private key file
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#
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try:
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args.PrivateKeyFileName = args.PrivateKeyFile.name
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args.PrivateKeyFile.close()
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except:
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try:
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#
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# Get path to currently executing script or executable
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#
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if hasattr(sys, 'frozen'):
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RsaToolPath = sys.executable
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else:
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RsaToolPath = sys.argv[0]
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if RsaToolPath.startswith('"'):
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RsaToolPath = RsaToolPath[1:]
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if RsaToolPath.endswith('"'):
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RsaToolPath = RsaToolPath[:-1]
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args.PrivateKeyFileName = os.path.join(os.path.dirname(os.path.realpath(RsaToolPath)), TEST_SIGNING_PRIVATE_KEY_FILENAME)
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args.PrivateKeyFile = open(args.PrivateKeyFileName, 'rb')
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args.PrivateKeyFile.close()
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except:
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print 'ERROR: test signing private key file %s missing' % (args.PrivateKeyFileName)
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sys.exit(1)
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#
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# Extract public key from private key into STDOUT
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#
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Process = subprocess.Popen('%s rsa -in "%s" -modulus -noout' % (OpenSslCommand, args.PrivateKeyFileName), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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PublicKeyHexString = Process.communicate()[0].split('=')[1].strip()
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PublicKey = ''
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while len(PublicKeyHexString) > 0:
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PublicKey = PublicKey + chr(int(PublicKeyHexString[0:2],16))
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PublicKeyHexString=PublicKeyHexString[2:]
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if Process.returncode <> 0:
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sys.exit(Process.returncode)
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if args.MonotonicCountStr:
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try:
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if args.MonotonicCountStr.upper().startswith('0X'):
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args.MonotonicCountValue = (long)(args.MonotonicCountStr, 16)
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else:
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args.MonotonicCountValue = (long)(args.MonotonicCountStr)
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except:
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pass
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if args.Encode:
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FullInputFileBuffer = args.InputFileBuffer
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if args.MonotonicCountStr:
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format = "%dsQ" % len(args.InputFileBuffer)
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FullInputFileBuffer = struct.pack(format, args.InputFileBuffer, args.MonotonicCountValue)
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#
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# Sign the input file using the specified private key and capture signature from STDOUT
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#
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Process = subprocess.Popen('%s sha256 -sign "%s"' % (OpenSslCommand, args.PrivateKeyFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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Signature = Process.communicate(input=FullInputFileBuffer)[0]
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if Process.returncode <> 0:
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sys.exit(Process.returncode)
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#
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# Write output file that contains hash GUID, Public Key, Signature, and Input data
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#
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args.OutputFile = open(args.OutputFileName, 'wb')
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args.OutputFile.write(EFI_HASH_ALGORITHM_SHA256_GUID.get_bytes_le())
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args.OutputFile.write(PublicKey)
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args.OutputFile.write(Signature)
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args.OutputFile.write(args.InputFileBuffer)
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args.OutputFile.close()
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if args.Decode:
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#
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# Parse Hash Type, Public Key, and Signature from the section header
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#
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Header = EFI_CERT_BLOCK_RSA_2048_SHA256._make(EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT.unpack_from(args.InputFileBuffer))
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args.InputFileBuffer = args.InputFileBuffer[EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT.size:]
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#
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# Verify that the Hash Type matches the expected SHA256 type
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#
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if uuid.UUID(bytes_le = Header.HashType) <> EFI_HASH_ALGORITHM_SHA256_GUID:
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print 'ERROR: unsupport hash GUID'
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sys.exit(1)
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#
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# Verify the public key
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#
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if Header.PublicKey <> PublicKey:
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print 'ERROR: Public key in input file does not match public key from private key file'
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sys.exit(1)
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FullInputFileBuffer = args.InputFileBuffer
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if args.MonotonicCountStr:
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format = "%dsQ" % len(args.InputFileBuffer)
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FullInputFileBuffer = struct.pack(format, args.InputFileBuffer, args.MonotonicCountValue)
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#
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# Write Signature to output file
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#
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open(args.OutputFileName, 'wb').write(Header.Signature)
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#
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# Verify signature
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#
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Process = subprocess.Popen('%s sha256 -prverify "%s" -signature %s' % (OpenSslCommand, args.PrivateKeyFileName, args.OutputFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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Process.communicate(input=FullInputFileBuffer)
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if Process.returncode <> 0:
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print 'ERROR: Verification failed'
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os.remove (args.OutputFileName)
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sys.exit(Process.returncode)
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#
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# Save output file contents from input file
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#
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open(args.OutputFileName, 'wb').write(args.InputFileBuffer)
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