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import binascii |
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from ige import SecurityException, log |
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import hashlib |
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import os |
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import rsa |
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import time |
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defaultMethod = "rsa" |
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# support for RSA keys |
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publicKey = None |
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privateKey = None |
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def init(configDir, authMethod, size=2048): |
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# RSA needs init |
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if authMethod == "rsa": |
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initRSAKeys(configDir, size) |
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def _generateKeys(privatePath, publicPath, size): |
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global publicKey, privateKey |
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# no keys, let's generate them |
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log.message("Generating RSA keys of size {0}, please wait...".format(size)) |
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publicKey, privateKey = rsa.newkeys(size) |
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with open(privatePath, 'w') as privKeyFile: |
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privKeyFile.write(privateKey.save_pkcs1()) |
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with open(publicPath, 'w') as pubKeyFile: |
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pubKeyFile.write(publicKey.save_pkcs1()) |
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def initRSAKeys(configDir, size): |
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"""Load or generate and save RSA keys""" |
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global publicKey, privateKey |
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privatePath = os.path.join(configDir, 'private.pem') |
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publicPath = os.path.join(configDir, 'public.pem') |
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try: |
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log.message("Loading PRIVATE RSA key") |
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with open(privatePath, 'rb') as privKeyFile: |
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privateKey = rsa.PrivateKey.load_pkcs1(privKeyFile.read()) |
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log.message("Loading PUBLIC RSA key") |
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with open(publicPath, 'rb') as pubKeyFile: |
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publicKey = rsa.PublicKey.load_pkcs1(pubKeyFile.read()) |
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except ValueError: |
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_generateKeys(privatePath, publicPath, size) |
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except IOError: |
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_generateKeys(privatePath, publicPath, size) |
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def getPublicKey(): |
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"""Get current RSA public key""" |
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assert publicKey is not None |
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return publicKey |
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def getPrivateKey(): |
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"""Get current RSA private key""" |
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assert privateKey is not None |
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return privateKey |
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# |
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def getMethod(challenge): |
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return challenge.split(":")[0] |
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def getWelcomeString(method = "rsa"): |
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"""Return welcome string (typically a challenge)""" |
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if method == "sha256": |
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return "sha256:" + hashlib.sha256(str(time.time())).hexdigest() |
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elif method == "rsa": |
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publicKey = getPublicKey() |
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return "rsa:%s:%s" % (publicKey.n, publicKey.e) |
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raise SecurityException("Unsupported authentication method %s" % str(method)) |
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def encode(password, challenge): |
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"""Encode password using auth method specified in the challenge""" |
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method = getMethod(challenge) |
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if method == "sha256": |
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return hashlib.sha256(password + challenge).hexdigest() |
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elif method == "rsa": |
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dummy, n, e = challenge.split(":") |
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key = rsa.PublicKey(int(n), int(e)) |
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return binascii.hexlify(rsa.encrypt(password.encode('utf-8'), key)) |
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raise SecurityException("Unsupported authentication method %s" % str(method)) |
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def verify(encodedPassword, account, challenge): |
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"""Verify password based on client encoded password and auth method""" |
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method = getMethod(challenge) |
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unwrappedPassword = unwrapUserPassword(encodedPassword, challenge) |
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return account.hashPassword(unwrappedPassword) == account.passwd |
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def unwrapUserPassword(password, challenge): |
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"""Decode password according to auth method (if possible)""" |
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method = getMethod(challenge) |
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if method == "sha256": |
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return password |
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elif method == "rsa": |
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return rsa.decrypt(binascii.unhexlify(password), getPrivateKey()) |
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raise SecurityException("Unsupported authentication method %s" % str(method)) |
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96
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ospaceteam /
outerspace
