BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py

   1 ## @file
   2 # This tool encodes and decodes GUIDed FFS sections for a GUID type of
   3 # EFI_CERT_TYPE_RSA2048_SHA256_GUID defined in the UEFI 2.4 Specification as
   4 #   {0xa7717414, 0xc616, 0x4977, {0x94, 0x20, 0x84, 0x47, 0x12, 0xa7, 0x35, 0xbf}}
   5 # This tool has been tested with OpenSSL 1.0.1e 11 Feb 2013
   6 #
   7 # Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
   8 # This program and the accompanying materials
   9 # are licensed and made available under the terms and conditions of the BSD License
  10 # which accompanies this distribution.  The full text of the license may be found at
  11 # http://opensource.org/licenses/bsd-license.php
  12 #
  13 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15 #
  16
  17 '''
  18 Rsa2048Sha256Sign
  19 '''
  20
  21 import os
  22 import sys
  23 import argparse
  24 import subprocess
  25 import uuid
  26 import struct
  27 import collections
  28
  29 #
  30 # GUID for SHA 256 Hash Algorithm from UEFI Specification
  31 #
  32 EFI_HASH_ALGORITHM_SHA256_GUID = uuid.UUID('{51aa59de-fdf2-4ea3-bc63-875fb7842ee9}')
  33
  34 #
  35 # Structure defintion to unpack EFI_CERT_BLOCK_RSA_2048_SHA256 from UEFI 2.4 Specification
  36 #
  37 #   typedef struct _EFI_CERT_BLOCK_RSA_2048_SHA256 {
  38 #     EFI_GUID HashType;
  39 #     UINT8 PublicKey[256];
  40 #     UINT8 Signature[256];
  41 #   } EFI_CERT_BLOCK_RSA_2048_SHA256;
  42 #
  43 EFI_CERT_BLOCK_RSA_2048_SHA256        = collections.namedtuple('EFI_CERT_BLOCK_RSA_2048_SHA256', ['HashType','PublicKey','Signature'])
  44 EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT = struct.Struct('16s256s256s')
  45
  46 #
  47 # Filename of test signing private key that is stored in same directory as this tool
  48 #
  49 TEST_SIGNING_PRIVATE_KEY_FILENAME = 'TestSigningPrivateKey.pem'
  50
  51 if __name__ == '__main__':
  52   #
  53   # Save name of the program
  54   #
  55   ProgramName = sys.argv[0]
  56
  57   #
  58   # Print copyright
  59   #
  60   print '%s - Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.' % (ProgramName)
  61
  62   #
  63   # Create command line argument parser object
  64   #
  65   parser = argparse.ArgumentParser(prog=ProgramName, usage='%(prog)s -e|-d [options] <input_file>', add_help=False)
  66   group = parser.add_mutually_exclusive_group(required=True)
  67   group.add_argument("-e", action="store_true", dest='Encode', help='encode file')
  68   group.add_argument("-d", action="store_true", dest='Decode', help='decode file')
  69   parser.add_argument("-o", "--output", dest='OutputFile', type=argparse.FileType('wb'), metavar='filename', help="specify the output filename", required=True)
  70   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.")
  71   parser.add_argument("-v", "--verbose", dest='Verbose', action="store_true", help="increase output messages")
  72   parser.add_argument("-q", "--quiet", dest='Quiet', action="store_true", help="reduce output messages")
  73   parser.add_argument("--debug", dest='Debug', type=int, metavar='[0-9]', choices=range(0,10), default=0, help="set debug level")
  74   parser.add_argument("--version", dest='Version', action="store_true", help="display the program version and exit")
  75   parser.add_argument("-h", "--help", dest='Help', action="help", help="display this help text")
  76   parser.add_argument(metavar="input_file", dest='InputFile', type=argparse.FileType('rb'), help="specify the input filename")
  77
  78   #
  79   # Parse command line arguments
  80   #
  81   args = parser.parse_args()
  82
  83   #
  84   # Generate file path to Open SSL command
  85   #
  86   OpenSslCommand = 'openssl'
  87   try:
  88     OpenSslPath = os.environ['OPENSSL_PATH']
  89     OpenSslCommand = os.path.join(OpenSslPath, OpenSslCommand)
  90   except:
  91     pass
  92
  93   #
  94   # Verify that Open SSL command is available
  95   #
  96   try:
  97     Process = subprocess.Popen('%s version' % (OpenSslCommand), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  98   except:
  99     print 'ERROR: Open SSL command not available.  Please verify PATH or set OPENSSL_PATH'
 100     sys.exit(1)
 101
 102   Version = Process.communicate()
 103   if Process.returncode <> 0:
 104     print 'ERROR: Open SSL command not available.  Please verify PATH or set OPENSSL_PATH'
 105     sys.exit(Process.returncode)
 106   print Version[0]
 107
 108   #
 109   # Read input file into a buffer and save input filename
 110   #
 111   args.InputFileName   = args.InputFile.name
 112   args.InputFileBuffer = args.InputFile.read()
 113   args.InputFile.close()
 114
 115   #
 116   # Save output filename and close output file
 117   #
 118   args.OutputFileName = args.OutputFile.name
 119   args.OutputFile.close()
 120
 121   #
 122   # Save private key filename and close private key file
 123   #
 124   try:
 125     args.PrivateKeyFileName = args.PrivateKeyFile.name
 126     args.PrivateKeyFile.close()
 127   except:
 128     try:
 129       #
 130       # Get path to currently executing script or executable
 131       #
 132       if hasattr(sys, 'frozen'):
 133           RsaToolPath = sys.executable
 134       else:
 135           RsaToolPath = sys.argv[0]
 136       if RsaToolPath.startswith('"'):
 137           RsaToolPath = RsaToolPath[1:]
 138       if RsaToolPath.endswith('"'):
 139           RsaToolPath = RsaToolPath[:-1]
 140       args.PrivateKeyFileName = os.path.join(os.path.dirname(os.path.realpath(RsaToolPath)), TEST_SIGNING_PRIVATE_KEY_FILENAME)
 141       args.PrivateKeyFile = open(args.PrivateKeyFileName, 'rb')
 142       args.PrivateKeyFile.close()
 143     except:
 144       print 'ERROR: test signing private key file %s missing' % (args.PrivateKeyFileName)
 145       sys.exit(1)
 146
 147   #
 148   # Extract public key from private key into STDOUT
 149   #
 150   Process = subprocess.Popen('%s rsa -in "%s" -modulus -noout' % (OpenSslCommand, args.PrivateKeyFileName), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 151   PublicKeyHexString = Process.communicate()[0].split('=')[1].strip()
 152   PublicKey = ''
 153   while len(PublicKeyHexString) > 0:
 154     PublicKey = PublicKey + chr(int(PublicKeyHexString[0:2],16))
 155     PublicKeyHexString=PublicKeyHexString[2:]
 156   if Process.returncode <> 0:
 157     sys.exit(Process.returncode)
 158
 159   if args.Encode:
 160     #
 161     # Sign the input file using the specified private key and capture signature from STDOUT
 162     #
 163     Process = subprocess.Popen('%s sha256 -sign "%s"' % (OpenSslCommand, args.PrivateKeyFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 164     Signature = Process.communicate(input=args.InputFileBuffer)[0]
 165     if Process.returncode <> 0:
 166       sys.exit(Process.returncode)
 167
 168     #
 169     # Write output file that contains hash GUID, Public Key, Signature, and Input data
 170     #
 171     args.OutputFile = open(args.OutputFileName, 'wb')
 172     args.OutputFile.write(EFI_HASH_ALGORITHM_SHA256_GUID.get_bytes_le())
 173     args.OutputFile.write(PublicKey)
 174     args.OutputFile.write(Signature)
 175     args.OutputFile.write(args.InputFileBuffer)
 176     args.OutputFile.close()
 177
 178   if args.Decode:
 179     #
 180     # Parse Hash Type, Public Key, and Signature from the section header
 181     #
 182     Header = EFI_CERT_BLOCK_RSA_2048_SHA256._make(EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT.unpack_from(args.InputFileBuffer))
 183     args.InputFileBuffer = args.InputFileBuffer[EFI_CERT_BLOCK_RSA_2048_SHA256_STRUCT.size:]
 184
 185     #
 186     # Verify that the Hash Type matches the expected SHA256 type
 187     #
 188     if uuid.UUID(bytes_le = Header.HashType) <> EFI_HASH_ALGORITHM_SHA256_GUID:
 189       print 'ERROR: unsupport hash GUID'
 190       sys.exit(1)
 191
 192     #
 193     # Verify the public key
 194     #
 195     if Header.PublicKey <> PublicKey:
 196       print 'ERROR: Public key in input file does not match public key from private key file'
 197       sys.exit(1)
 198
 199     #
 200     # Write Signature to output file
 201     #
 202     open(args.OutputFileName, 'wb').write(Header.Signature)
 203
 204     #
 205     # Verify signature
 206     #
 207     Process = subprocess.Popen('%s sha256 -prverify "%s" -signature %s' % (OpenSslCommand, args.PrivateKeyFileName, args.OutputFileName), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 208     Process.communicate(args.InputFileBuffer)
 209     if Process.returncode <> 0:
 210       print 'ERROR: Verification failed'
 211       os.remove (args.OutputFileName)
 212       sys.exit(Process.returncode)
 213
 214     #
 215     # Save output file contents from input file
 216     #
 217     open(args.OutputFileName, 'wb').write(args.InputFileBuffer)