mirror of https://gitlab.com/bashrc2/epicyon
111 lines
3.9 KiB
Python
111 lines
3.9 KiB
Python
__filename__ = "posts.py"
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__author__ = "Bob Mottram"
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__credits__ = ['lamia']
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__license__ = "AGPL3+"
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__version__ = "0.0.1"
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__maintainer__ = "Bob Mottram"
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__email__ = "bob@freedombone.net"
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__status__ = "Production"
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from person import createPerson
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from Crypto.PublicKey import RSA
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from Crypto.Hash import SHA256
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#from Crypto.Signature import PKCS1_v1_5
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from Crypto.Signature import pkcs1_15
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from requests.auth import AuthBase
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import base64
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import json
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def signPostHeaders(privateKeyPem: str, username: str, domain: str, path: str, https: bool, messageBodyJson) -> str:
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"""Returns a raw signature string that can be plugged into a header and
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used to verify the authenticity of an HTTP transmission.
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"""
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prefix='https'
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if not https:
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prefix='http'
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keyID = prefix+'://'+domain+'/'+username+'#main-key'
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if not messageBodyJson:
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headers = {'host': domain}
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else:
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bodyDigest = base64.b64encode(SHA256.new(messageBodyJson.encode()).digest())
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headers = {'host': domain, 'digest': f'SHA-256={bodyDigest}'}
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privateKeyPem = RSA.import_key(privateKeyPem)
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headers.update({
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'(request-target)': f'post {path}',
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})
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# build a digest for signing
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signedHeaderKeys = headers.keys()
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signedHeaderText = ''
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for headerKey in signedHeaderKeys:
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signedHeaderText += f'{headerKey}: {headers[headerKey]}\n'
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signedHeaderText = signedHeaderText.strip()
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headerDigest = SHA256.new(signedHeaderText.encode('ascii'))
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# Sign the digest
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rawSignature = pkcs1_15.new(privateKeyPem).sign(headerDigest)
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signature = base64.b64encode(rawSignature).decode('ascii')
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# Put it into a valid HTTP signature format
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signatureDict = {
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'keyId': keyID,
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'algorithm': 'rsa-sha256',
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'headers': ' '.join(signedHeaderKeys),
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'signature': signature
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}
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signatureHeader = ','.join(
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[f'{k}="{v}"' for k, v in signatureDict.items()])
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return signatureHeader
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def verifyPostHeaders(https: bool, publicKeyPem: str, headers: dict, path: str, GETmethod: bool, messageBodyJson: str) -> bool:
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"""Returns true or false depending on if the key that we plugged in here
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validates against the headers, method, and path.
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publicKeyPem - the public key from an rsa key pair
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headers - should be a dictionary of request headers
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path - the relative url that was requested from this site
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GETmethod - GET or POST
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messageBodyJson - the received request body (used for digest)
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"""
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if GETmethod:
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method='GET'
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else:
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method='POST'
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prefix='https'
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if not https:
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prefix='http'
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publicKeyPem = RSA.import_key(publicKeyPem)
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# Build a dictionary of the signature values
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signatureHeader = headers['signature']
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signatureDict = {
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k: v[1:-1]
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for k, v in [i.split('=', 1) for i in signatureHeader.split(',')]
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}
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# Unpack the signed headers and set values based on current headers and
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# body (if a digest was included)
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signedHeaderList = []
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for signedHeader in signatureDict['headers'].split(' '):
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if signedHeader == '(request-target)':
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signedHeaderList.append(
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f'(request-target): {method.lower()} {path}')
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elif signedHeader == 'digest':
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bodyDigest = base64.b64encode(SHA256.new(messageBodyJson.encode()).digest())
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signedHeaderList.append(f'digest: SHA-256={bodyDigest}')
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else:
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signedHeaderList.append(
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f'{signedHeader}: {headers[signedHeader]}')
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# Now we have our header data digest
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signedHeaderText = '\n'.join(signedHeaderList)
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headerDigest = SHA256.new(signedHeaderText.encode('ascii'))
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# Get the signature, verify with public key, return result
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signature = base64.b64decode(signatureDict['signature'])
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try:
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pkcs1_15.new(publicKeyPem).verify(headerDigest, signature)
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return True
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except (ValueError, TypeError):
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return False
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