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import json
try:
from http_parser.parser import HttpParser
except ImportError:
from http_parser.pyparser import HttpParser
import http_sfv
from urllib.parse import parse_qs
from Cryptodome.Signature import pss
from Cryptodome.Signature import pkcs1_15
from Cryptodome.Signature import DSS
from Cryptodome.Hash import SHA512
from Cryptodome.Hash import SHA256
from Cryptodome.Hash import HMAC
from Cryptodome.PublicKey import RSA
from Cryptodome.PublicKey import ECC
from Cryptodome import Random
from Cryptodome.IO import PEM
from Cryptodome.IO import PKCS8
from Cryptodome.Signature.pss import MGF1
from Cryptodome.Util.asn1 import DerOctetString
from Cryptodome.Util.asn1 import DerBitString
from Cryptodome.Util.asn1 import DerSequence
from nacl.signing import SigningKey
from nacl.signing import VerifyKey
import base64
from httpsig import *
from flask import Flask, request
app = Flask(__name__, static_folder='/frontend', static_url_path='/')
# used with RSA-PSS and jose PS512
mgf512 = lambda x, y: MGF1(x, y, SHA512)
# used with jose PS384
mgf384 = lambda x, y: MGF1(x, y, SHA384)
# used with jose PS256
mgf256 = lambda x, y: MGF1(x, y, SHA256)
@app.errorhandler(Exception)
def handle_exception(e):
response = {
'error': str(e)
}
return response, 500
@app.post("/parse")
def parse():
data = request.json
msg = data['msg']
lines = msg.split('\n')
lines = combine_8792(lines)
msg = '\n'.join(lines).encode('utf-8')
response = {
'components': parse_components(msg)
}
if 'req' in data:
req = data['req']
lines = req.split('\n')
lines = combine_8792(lines)
req = '\n'.join(lines).encode('utf-8')
response['reqComponents'] = parse_components(req, True)
return response
@app.post("/base")
def base():
data = request.json
#print(data)
components = data['components']
params = data['params']
reqComponents = []
if 'reqComponents' in data:
reqComponents = data['reqComponents']
response = generate_base(
components,
data['coveredComponents'],
params,
reqComponents
)
#print(base)
return response
@app.post("/sign")
def sign():
data = request.json
siginput = data['signatureInput']
sigparams = data['signatureParams']
signingKeyType = data['signingKeyType']
alg = data['alg']
label = data['label']
key = None
sharedKey = None
jwk = None
if signingKeyType == 'x509':
key = parseKeyX509(data['signingKeyX509'])
elif signingKeyType == 'shared':
if alg != 'hmac-sha256':
# shared key type only good for hmac
return {'error': 'Shared key with bad algorithm: ' + alg}, 400
sharedKey = data['signingKeyShared'].encode('utf-8')
elif signingKeyType == 'jwk':
key, jwk, sharedKey = parseKeyJwk(data['signingKeyJwk'])
else:
# unknown key type
return {'error': 'Unknown key type: ' + signingKeyType}, 400
if alg == 'jose' and signingKeyType != 'jwk':
# JOSE-driven algorithm choice only available for JWK formatted keys
return {'error': 'JOSE algorithm requires JWK formatted key, not ' + signingKeyType}, 400
if alg == 'rsa-pss-sha512':
h = SHA512.new(siginput.encode('utf-8'))
signer = pss.new(key, mask_func=mgf512, salt_bytes=64)
signed = http_sfv.Item(signer.sign(h))
elif alg == 'rsa-v1_5-sha256':
h = SHA256.new(siginput.encode('utf-8'))
signer = pkcs1_15.new(key)
signed = http_sfv.Item(signer.sign(h))
elif alg == 'ecdsa-p256-sha256':
h = SHA256.new(siginput.encode('utf-8'))
signer = DSS.new(key, 'fips-186-3')
signed = http_sfv.Item(signer.sign(h))
elif alg == 'hmac-sha256':
signer = HMAC.new(sharedKey, digestmod=SHA256)
signer.update(siginput.encode('utf-8'))
signed = http_sfv.Item(signer.digest())
elif alg == 'ed25519':
h = siginput.encode('utf-8')
signed = http_sfv.Item(key.sign(h).signature)
elif alg == 'jose':
# we're doing JOSE algs based on the key value
if (not 'alg' in jwk) or (jwk['alg'] == 'none'):
# unknown algorithm
return {'error': 'JWK algorithm not found'}, 400
elif jwk['alg'] == 'RS256':
h = SHA256.new(siginput.encode('utf-8'))
signer = pkcs1_15.new(key)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'RS384':
h = SHA384.new(siginput.encode('utf-8'))
signer = pkcs1_15.new(key)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'RS512':
h = SHA512.new(siginput.encode('utf-8'))
signer = pkcs1_15.new(key)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'PS256':
h = SHA256.new(siginput.encode('utf-8'))
signer = pss.new(key, mask_func=mgf256, salt_bytes=32)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'PS384':
h = SHA384.new(siginput.encode('utf-8'))
signer = pss.new(key, mask_func=mgf384, salt_bytes=48)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'PS512':
h = SHA512.new(siginput.encode('utf-8'))
signer = pss.new(key, mask_func=mgf512, salt_bytes=64)
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'HS256':
signer = HMAC.new(sharedKey, digestmod=SHA256)
signer.update(siginput.encode('utf-8'))
signed = http_sfv.Item(signer.digest())
elif jwk['alg'] == 'HS384':
signer = HMAC.new(sharedKey, digestmod=SHA384)
signer.update(siginput.encode('utf-8'))
signed = http_sfv.Item(signer.digest())
elif jwk['alg'] == 'HS256':
signer = HMAC.new(sharedKey, digestmod=SHA512)
signer.update(siginput.encode('utf-8'))
signed = http_sfv.Item(signer.digest())
elif jwk['alg'] == 'ES256':
h = SHA256.new(siginput.encode('utf-8'))
signer = DSS.new(key, 'fips-186-3')
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'ES384':
h = SHA384.new(siginput.encode('utf-8'))
signer = DSS.new(key, 'fips-186-3')
signed = http_sfv.Item(signer.sign(h))
elif jwk['alg'] == 'ES512':
h = SHA512.new(siginput.encode('utf-8'))
signer = DSS.new(key, 'fips-186-3')
signed = http_sfv.Item(signer.sign(h))
else:
# unknown algorithm
return {'error': 'Unknown JWK algorithm: ' + jwk['alg']}, 400
else:
# unknown algorithm
return {'error': 'Unknown algorithm: ' + alg}, 400
if not signed:
return {'error': 'Failed to generate signature'}, 500
# by here, we know that we have the signed blob
#http_sfv.Item(signed)
encoded = base64.b64encode(signed.value)
sigparamheader = http_sfv.InnerList()
sigparamheader.parse(sigparams.encode('utf-8'))
siginputheader = http_sfv.Dictionary()
siginputheader[label] = sigparamheader
sigheader = http_sfv.Dictionary()
sigheader[label] = signed
headers = ''
headers += 'Signature-Input: ' + str(siginputheader)
headers += '\n'
headers += 'Signature: ' + str(sigheader)
response = {
'signatureOutput': encoded.decode('utf-8'),
'headers': headers
}
return response
@app.post("/verify")
def verify():
data = request.json
msg = data['httpMsg']
siginput = data['signatureInput']
sigparams = data['signatureParams']
signingKeyType = data['signingKeyType']
alg = data['alg']
signature = http_sfv.Item()
signature.parse(data['signature'].encode('utf-8')) # the parser needs to be called explicitly in this way or else this is treated as a string
key = None
sharedKey = None
jwk = None
if signingKeyType == 'x509':
key = parseKeyX509(data['signingKeyX509'])
elif signingKeyType == 'shared':
if alg != 'hmac-sha256':
# shared key type only good for hmac
return {'error': 'Shared key used with invalid algorithm: ' + alg}, 400
sharedKey = data['signingKeyShared'].encode('utf-8')
elif signingKeyType == 'jwk':
key, jwk, sharedKey = parseKeyJwk(data['signingKeyJwk'])
else:
# unknown key type
return {'error': 'Unknown key type' + signingKeyType}, 400
if alg == 'jose' and signingKeyType != 'jwk':
# JOSE-driven algorithm choice only available for JWK formatted keys
return {'error': 'JOSE signing algorithm requires JWK formatted key'}, 400
try:
verified = False
if alg == 'rsa-pss-sha512':
h = SHA512.new(siginput.encode('utf-8'))
verifier = pss.new(key, mask_func=mgf512, salt_bytes=64)
verifier.verify(h, signature.value)
verified = True
elif alg == 'rsa-v1_5-sha256':
h = SHA256.new(siginput.encode('utf-8'))
verifier = pkcs1_15.new(key)
verifier.verify(h, signature.value)
verified = True
elif alg == 'ecdsa-p256-sha256':
h = SHA256.new(siginput.encode('utf-8'))
verifier = DSS.new(key, 'fips-186-3')
verifier.verify(h, signature.value)
verified = True
elif alg == 'hmac-sha256':
verifier = HMAC.new(sharedKey, digestmod=SHA256)
verifier.update(siginput.encode('utf-8'))
verified = (verifier.digest() == signature.value)
elif alg == 'ed25519':
h = siginput.encode('utf-8')
verified = key.verify(h, signed.value)
elif alg == 'jose':
# we're doing JOSE algs based on the key value
if (not 'alg' in jwk) or (jwk['alg'] == 'none'):
# unknown algorithm
return {'error': 'Algorithm not found in JWK'}, 400
elif jwk['alg'] == 'RS256':
h = SHA256.new(siginput.encode('utf-8'))
verifier = pkcs1_15.new(key)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'RS384':
h = SHA384.new(siginput.encode('utf-8'))
verifier = pkcs1_15.new(key)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'RS512':
h = SHA512.new(siginput.encode('utf-8'))
verifier = pkcs1_15.new(key)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'PS256':
h = SHA256.new(siginput.encode('utf-8'))
verifier = pss.new(key, mask_func=mgf256, salt_bytes=32)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'PS384':
h = SHA384.new(siginput.encode('utf-8'))
verifier = pss.new(key, mask_func=mgf384, salt_bytes=48)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'PS512':
h = SHA512.new(siginput.encode('utf-8'))
verifier = pss.new(key, mask_func=mgf512, salt_bytes=64)
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'HS256':
verifier = HMAC.new(sharedKey, digestmod=SHA256)
verifier.update(siginput.encode('utf-8'))
verified = (verifier.digest() == signature.value)
elif jwk['alg'] == 'HS384':
verifier = HMAC.new(sharedKey, digestmod=SHA384)
verifier.update(siginput.encode('utf-8'))
verified = (verifier.digest() == signature.value)
elif jwk['alg'] == 'HS512':
verifier = HMAC.new(sharedKey, digestmod=SHA512)
verifier.update(siginput.encode('utf-8'))
verified = (verifier.digest() == signature.value)
elif jwk['alg'] == 'ES256':
h = SHA256.new(siginput.encode('utf-8'))
verifier = DSS.new(key, 'fips-186-3')
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'ES384':
h = SHA384.new(siginput.encode('utf-8'))
verifier = DSS.new(key, 'fips-186-3')
verifier.verify(h, signature.value)
verified = True
elif jwk['alg'] == 'ES512':
h = SHA512.new(siginput.encode('utf-8'))
verifier = DSS.new(key, 'fips-186-3')
verifier.verify(h, signature.value)
verified = True
else:
# unknown algorithm
return {'error': 'Unknown JWK algorithm: ' + jwk['alg']}, 400
else:
# unknown algorithm
return {'error': 'Unknown algorithm: ' + alg}, 400
except (ValueError, TypeError) as err:
verified = False
response = {
'signatureVerified': verified
}
return response
def parseKeyJwk(signingKey):
jwk = json.loads(signingKey)
key = None
sharedKey = None
if jwk['kty'] == 'RSA':
if 'd' in jwk:
# private key
if 'q' in jwk and 'p' in jwk:
# CRT
key = RSA.construct((
b64ToInt(jwk['n']),
b64ToInt(jwk['e']),
b64ToInt(jwk['d']),
b64ToInt(jwk['p']),
b64ToInt(jwk['q'])
))
else:
# no CRT
key = RSA.construct((
b64ToInt(jwk['n']),
b64ToInt(jwk['e']),
b64ToInt(jwk['d'])
))
else:
# public key
key = RSA.construct((
b64ToInt(jwk['n']),
b64ToInt(jwk['e'])
))
elif jwk['kty'] == 'oct':
sharedKey = base64.urlsafe_b64decode(jwk['k'] + '===')
elif jwk['kty'] == 'EC':
if 'd' in jwk:
# private key
key = ECC.construct(
curve = jwk['crv'],
d = b64ToInt(jwk['d']),
point_x = b64ToInt(jwk['x']),
point_y = b64ToInt(jwk['y'])
)
else:
# public key
key = ECC.construct(
curve = jwk['crv'],
point_x = b64ToInt(jwk['x']),
point_y = b64ToInt(jwk['y'])
)
elif jwk['kty'] == 'OKP':
return (None, None, None)
else:
return (None, None, None)
return (key, jwk, sharedKey)
def b64ToInt(s):
# convert string to integer
if s:
return int.from_bytes(base64.urlsafe_b64decode(s + '==='), 'big')
else:
return None
def parseKeyX509(signingKey):
# try parsing a few different key formats
key = None
#print(1)
# PKCS8 Wrapped Key
try:
#print(2)
decoded = PEM.decode(signingKey)[0]
#print(12)
unwrapped = PKCS8.unwrap(decoded)[1]
#print(3)
try:
# RSA first
key = RSA.import_key(unwrapped)
#print(4)
except (ValueError, IndexError, TypeError):
try:
# EC if possible
key = ECC.import_key(unwrapped)
#print(5)
except (ValueError, IndexError, TypeError):
try:
# edDSA Key
der = DerOctetString()
der.decode(PKCS8.unwrap(PEM.decode(signingKey)[0])[1])
key = SigningKey(der.payload)
except (ValueError) as err:
print(err)
key = None
#print(6)
except (ValueError, IndexError, TypeError) as err:
#print(err)
key = None
#print(7)
# if we successfully parsed a key, return it
if key:
#print(8)
return key
# if there's no key yet, try an unwrapped certificate
try:
# Plain RSA Key
key = RSA.import_key(signingKey)
#print(9)
except (ValueError, IndexError, TypeError):
# plain EC key
try:
key = ECC.import_key(signingKey)
#print(13)
except (ValueError, IndexError, TypeError) as err:
try:
# edDSA key:
# sequence of ID and BitString
ds = DerSequence()
ds.decode(PEM.decode(signingKey)[0])
bs = DerBitString()
bs.decode(ds[1])
# the first byte of the bitstring is "0" for some reason??
key = VerifyKey(bs.payload[1:])
except (ValueError) as err:
print(err)
key = None
#print(10)
#print(11)
return key
@app.route('/', defaults={'path': 'index.html'})
@app.route('/<path:path>')
def serve_static_file(path):
return app.send_static_file(path)
# Copied from rfc_http_validate
def combine_8792(lines):
if not "NOTE: '\\' line wrapping per RFC 8792" in lines[0]:
return lines
lines = lines[2:]
output = [] # type: List[str]
continuation = False
for line in lines:
prev_continuation = continuation
if line.endswith("\\"):
continuation = True
line = line[:-1]
else:
continuation = False
if prev_continuation:
output[-1] += line.lstrip()
else:
output.append(line)
return output