khushalps
a1c1853ca5
git-subtree-dir: utils_v2 git-subtree-split: 88e444ac57ca6c090736645616d8a8a2d2af367b
482 lines
18 KiB
Python
482 lines
18 KiB
Python
"""
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AUTHOR:
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Khushal P Soonderji
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DATE:
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Friday, 30th May, 2025
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OBJECTIVE:
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To provide a way to analyze web certs.
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REFERENCES:
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N/A
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DOWNLOADS:
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N/A
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"""
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# *****************************************************************************************************************
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# ***** ****
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# *** IMPORT ***
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# ***** ****
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# *****************************************************************************************************************
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# To make sibling directories accessible for imports:
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import sys
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sys.path.append(".")
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sys.path.append("..")
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# System-level activities:
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import io
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# To check certs through cryptographic algorithms:
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from cryptography import x509
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.backends import default_backend
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from cryptography.x509.oid import NameOID
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# To fetch remote certs:
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import ssl
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import socket
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from urllib.parse import urlparse
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# To work with date and time:
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import datetime
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import humanize
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# For debugging:
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from icecream import IceCreamDebugger
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# *****************************************************************************************************************
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# ***** ****
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# *** MACROS / ONE-TIME INIT ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** VARIABLES ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** FUNCTIONS ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** CLASSES ***
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# ***** ****
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# *****************************************************************************************************************
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class CertAnalyzer:
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# Certificate variables:
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cert_path: str | None = None
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cert_data = None
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serial_no: int | None = None
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signature: bytes | None = None
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signature_algorithm: str | None = None
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not_valid_before: datetime.datetime | None = None
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not_valid_after: datetime.datetime | None = None
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subject: dict | None = None
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issuer: dict | None = None
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extensions: dict | None = None
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public_key_type: str | None = None
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public_key_size: int | None = None
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public_key: bytes | None = None
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exception: Exception | None = None
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exception_str: str | None = None
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# ┏┓
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# ┃ ┏┓┏┓╋┏┓┓┏┏╋┏┓┏┓
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# ┗┛┗┛┛┗┗┛ ┗┻┗┗┗┛┛
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def __init__(
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self,
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debug: bool = False,
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debug_prefix: str = "Certs Exp. | "
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):
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"""
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This simple class just checks if a provided certificate is valid or not and what is the date range in which it
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is valid.
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"""
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# Prepare the debugging utility:
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self._debug_prefix = debug_prefix
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self._printer = IceCreamDebugger(prefix = debug_prefix, includeContext = True)
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if not debug: self._printer.disable()
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# ┓┏ ┓
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# ┣┫┏┓┃┏┓┏┓┏┓┏
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# ┛┗┗ ┗┣┛┗ ┛ ┛
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# ┛
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def enable_debug(self):
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self._printer.enable()
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def disable_debug(self):
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self._printer.disable()
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def _clear(self):
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self.cert_path = None
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self.cert_data = None
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self.serial_no = None
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self.signature = None
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self.signature_algorithm = None
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self.not_valid_before = None
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self.not_valid_after = None
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self.subject = None
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self.issuer = None
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self.extensions = None
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self.public_key_type = None
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self.public_key_size = None
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self.public_key = None
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self.exception = None
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self.exception_str = None
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# ┏┓ •
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# ┃┃┏┓┏┓┏┓┏┓┏┓╋┓┏┓┏
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# ┣┛┛ ┗┛┣┛┗ ┛ ┗┗┗ ┛
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# ┛
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@property
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def is_valid(self) -> bool | None:
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"""
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Quickly tests if a loaded certificate is valid or not.
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:return: True if the certificate is valid, False if it isn't. Returns None if no certificate was loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Check if the cert is within the given time limits:
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now = datetime.datetime.now(datetime.timezone.utc)
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if self.not_valid_before <= now <= self.not_valid_after: return True
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else: return False
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@property
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def ttl(self) -> float | None:
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"""
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Gives the time for which the certificate is valid in seconds.
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:return: Time for which the certificate is valid in seconds. None if the certificate was not loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Calculate the no. of seconds left till expiry:
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now = datetime.datetime.now(datetime.timezone.utc)
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ttl_seconds = (self.not_valid_after - now).total_seconds()
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return ttl_seconds
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@property
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def ttl_human_readable(self) -> str | None:
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"""
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Gives human-readable validity period for certificates.
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e.g.: 1. valid for a month
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2. expired 3 days ago
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3. valid for 2 months
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:return: Human-readable validity period for certificates. None if the certificate was not loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Calculate the no. of seconds left till expiry:
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now = datetime.datetime.now(datetime.timezone.utc)
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ttl_seconds = (self.not_valid_after - now).total_seconds()
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ttl_readable = humanize.naturaldelta(datetime.timedelta(seconds = ttl_seconds))
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if ttl_seconds <= 0: ttl_readable = f"expired {ttl_readable} ago"
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else: ttl_readable = f"valid for {ttl_readable}"
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return ttl_readable
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@property
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def json(self) -> dict | None:
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"""
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Gives a JSON dump (as a dict) of the contents of the certificate.
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:return: JSON dump of the contents of the certificate; None if no certificate was loaded.
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"""
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# Gives nothing if the certificate failed to load:
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if self.cert_data is None:
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return None
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# Otherwise, return a formatted dictionary if teh certificate:
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return {
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"path": self.cert_path,
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"data": self.cert_data,
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"serialNo": self.serial_no,
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"signature": self.signature,
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"signatureAlgorithm": self.signature_algorithm,
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"notValidBefore": self.not_valid_before,
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"notValidAfter": self.not_valid_after,
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"isValid": self.is_valid,
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"ttl": self.ttl,
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"ttlHumanReadable": self.ttl_human_readable,
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"subject": self.subject,
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"issuer": self.issuer,
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"extensions": self.extensions,
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"publicKeyType": self.public_key_type,
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"publicKeySize": self.public_key_size,
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"publicKey": self.public_key,
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}
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# ┏┓ ┓ •
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# ┣┫┏┓┏┓┃┓┏┏┓┏
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# ┛┗┛┗┗┻┗┗┫┛┗┛
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# ┛
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def _analyze_cert(self) -> bool:
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"""
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This method analyzes the certificate that was provided either as a local file or a remote file. Call this from
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other methods that load certs (once the cert has been loaded by them.
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:return: True if the certificate has been analyzed, False otherwise.
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"""
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# Check if a cert was loaded:
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if self.cert_data is None:
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return False
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# Get the serial number and signature details of the cert:
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self.serial_no = self.cert_data.serial_number
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self.signature = self.cert_data.signature
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# self.signature_algorithm = self.cert_data.signature_hash_algorithm.name
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self.signature_algorithm = self.cert_data.signature_algorithm_oid._name
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# Get the subject:
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_sub = self.cert_data.subject
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self.subject = {
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"CN": _sub.get_attributes_for_oid(NameOID.COMMON_NAME),
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"O": _sub.get_attributes_for_oid(NameOID.ORGANIZATION_NAME),
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"OU": _sub.get_attributes_for_oid(NameOID.ORGANIZATIONAL_UNIT_NAME),
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"C": _sub.get_attributes_for_oid(NameOID.COUNTRY_NAME),
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"ST": _sub.get_attributes_for_oid(NameOID.STATE_OR_PROVINCE_NAME),
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"L": _sub.get_attributes_for_oid(NameOID.LOCALITY_NAME),
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"emailAddress": _sub.get_attributes_for_oid(NameOID.EMAIL_ADDRESS),
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}
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for k in self.subject.keys():
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v = self.subject[k]
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self.subject[k] = v[0].value if v else None
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# Get the issuer:
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_iss = self.cert_data.issuer
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self.issuer = {
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"CN": _iss.get_attributes_for_oid(NameOID.COMMON_NAME),
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"O": _iss.get_attributes_for_oid(NameOID.ORGANIZATION_NAME),
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"OU": _iss.get_attributes_for_oid(NameOID.ORGANIZATIONAL_UNIT_NAME),
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"C": _iss.get_attributes_for_oid(NameOID.COUNTRY_NAME),
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"ST": _iss.get_attributes_for_oid(NameOID.STATE_OR_PROVINCE_NAME),
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"L": _iss.get_attributes_for_oid(NameOID.LOCALITY_NAME),
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"emailAddress": _iss.get_attributes_for_oid(NameOID.EMAIL_ADDRESS),
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}
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for k in self.issuer.keys():
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v = self.issuer[k]
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self.issuer[k] = v[0].value if v else None
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# # Get the extensions:
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# _ext = self.cert_data.extensions
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# for ext in self.cert_data.extensions:
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# print(f"Extension OID: {ext.oid._name if ext.oid._name else ext.oid.dotted_string}")
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# print(f"Critical: {ext.critical}")
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# print(f"Value: {ext.value}")
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# print("-" * 10)
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# self.extensions = {
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#
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# }
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# Get the not valid before and not valid after dates:
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self.not_valid_before = self.cert_data.not_valid_before_utc
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self.not_valid_after = self.cert_data.not_valid_after_utc
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# Extract the key, and its type and size:
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_public_key = self.cert_data.public_key()
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self.public_key_type = type(_public_key).__name__
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self.public_key_size = _public_key.key_size
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self.public_key = _public_key.public_bytes(
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encoding = serialization.Encoding.PEM,
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format = serialization.PublicFormat.SubjectPublicKeyInfo
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)
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# Get the not valid before and not valid after dates:
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self.not_valid_before = self.cert_data.not_valid_before_utc
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self.not_valid_after = self.cert_data.not_valid_after_utc
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# Done here:
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return True
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# ┓ ┓ ┏┓
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# ┃ ┏┓┏┏┓┃ ┃ ┏┓┏┓╋┏
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# ┗┛┗┛┗┗┻┗ ┗┛┗ ┛ ┗┛
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def load_local(self, path: str | io.BytesIO) -> bool:
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"""
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Loads a certificate stored on a local file path and checks for its validity.
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:param path: The local file path where the certificate is stored or a file in RAM.
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:return: True if the certificate was loaded correctly, False if the certificate wasn't loaded.
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"""
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# Clear any previous assessment:
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self._clear()
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# Note down the certificate that is being tested:
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self.cert_path = path
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try:
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# Read the contents of the certificate file:
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if isinstance(path, str):
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with open(path, "rb") as f: cert_data = f.read()
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elif isinstance(path, io.BytesIO):
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path.seek(0)
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cert_data = path.read()
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else: cert_data = None
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# Load the certificate:
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self.cert_data = x509.load_pem_x509_certificate(cert_data, default_backend())
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# Analyze the certificate:
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self._analyze_cert()
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# All done successfully:
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return True
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except Exception as exception:
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self._printer(path, exception)
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self.exception = exception
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self.exception_str = str(exception)
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self.cert_data = None
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return False
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# ┳┓ ┏┓
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# ┣┫┏┓┏┳┓┏┓╋┏┓ ┃ ┏┓┏┓╋┏
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# ┛┗┗ ┛┗┗┗┛┗┗ ┗┛┗ ┛ ┗┛
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def load_remote(self, hostname: str, port: int = 443) -> bool:
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"""
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Loads the certificate of a remote host and checks for its validity.
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:param hostname: The remote host URL.
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:param port: The remote host's port on which the service is running.
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:return: True if the certificate was loaded correctly, False if the certificate wasn't loaded.
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"""
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# Clear any previous assessment:
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self._clear()
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# Parse the URL's hostname:
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hostname = urlparse(hostname).hostname or hostname
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# Note down the certificate that is being tested:
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self.cert_path = f"{hostname}:{port}"
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try:
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# Fetch the remote certificate:
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context = ssl.create_default_context()
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with socket.create_connection((hostname, port)) as sock:
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with context.wrap_socket(sock, server_hostname = hostname) as ssock:
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# Attempt to retrieve the certificate in DER format
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try:
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der_cert = ssock.getpeercert(binary_form = True)
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self.cert_data = x509.load_der_x509_certificate(der_cert, default_backend())
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# If DER parsing fails, retrieve the certificate in PEM format:
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except ValueError:
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pem_cert = ssl.DER_cert_to_PEM_cert(ssock.getpeercert(binary_form = True))
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self.cert_data = x509.load_pem_x509_certificate(pem_cert.encode(), default_backend())
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# Analyze the certificate:
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self._analyze_cert()
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# All done successfully:
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return True
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except Exception as exception:
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self._printer(hostname, port, exception)
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self.exception = exception
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self.exception_str = str(exception)
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self.cert_data = None
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return False
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# *****************************************************************************************************************
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# ***** ****
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# *** MAIN PROGRAM ***
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# ***** ****
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# *****************************************************************************************************************
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if __name__ == "__main__":
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def show_details(my_cert: CertAnalyzer):
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print("Cert. Path :", my_cert.cert_path)
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print("Serial No. :", my_cert.serial_no)
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print("Signature :", my_cert.signature)
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print("Sig. Algo. :", my_cert.signature_algorithm)
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print("Not Before :", my_cert.not_valid_before)
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print("Not After :", my_cert.not_valid_after)
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print("Is Valid :", my_cert.is_valid)
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print("TTL (seconds) :", my_cert.ttl)
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print("TTL (human) :", my_cert.ttl_human_readable)
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print("Subject :", my_cert.subject)
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print("Issuer :", my_cert.issuer)
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print("Pub. Key Type :", my_cert.public_key_type)
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print("Pub. Key Size :", my_cert.public_key_size)
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print("Pub. Key :", my_cert.public_key)
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print("Exception :", my_cert.exception_str)
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print("JSON Dump :", my_cert.json)
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# Create an instance:
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my_cert = CertAnalyzer(debug = False)
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# Test a remote path:
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print("\n---\n")
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my_cert.load_remote("https://thecaoffice.com/", port = 443)
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show_details(my_cert)
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# Test a local path:
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print("\n---\n")
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my_cert.load_local(input("Cert File Path (Local): "))
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print("----------------------")
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show_details(my_cert)
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