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502 lines
17 KiB
Python
502 lines
17 KiB
Python
![]()
2 months ago
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import contextlib
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import ctypes
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import platform
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import ssl
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import typing
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from ctypes import (
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CDLL,
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POINTER,
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c_bool,
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c_char_p,
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c_int32,
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c_long,
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c_uint32,
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c_ulong,
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c_void_p,
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)
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from ctypes.util import find_library
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from ._ssl_constants import _set_ssl_context_verify_mode
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_mac_version = platform.mac_ver()[0]
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_mac_version_info = tuple(map(int, _mac_version.split(".")))
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if _mac_version_info < (10, 8):
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raise ImportError(
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f"Only OS X 10.8 and newer are supported, not {_mac_version_info[0]}.{_mac_version_info[1]}"
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)
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def _load_cdll(name: str, macos10_16_path: str) -> CDLL:
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"""Loads a CDLL by name, falling back to known path on 10.16+"""
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try:
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# Big Sur is technically 11 but we use 10.16 due to the Big Sur
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# beta being labeled as 10.16.
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path: str | None
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if _mac_version_info >= (10, 16):
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path = macos10_16_path
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else:
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path = find_library(name)
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if not path:
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raise OSError # Caught and reraised as 'ImportError'
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return CDLL(path, use_errno=True)
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except OSError:
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raise ImportError(f"The library {name} failed to load") from None
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Security = _load_cdll(
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"Security", "/System/Library/Frameworks/Security.framework/Security"
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)
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CoreFoundation = _load_cdll(
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"CoreFoundation",
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"/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation",
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)
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Boolean = c_bool
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CFIndex = c_long
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CFStringEncoding = c_uint32
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CFData = c_void_p
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CFString = c_void_p
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CFArray = c_void_p
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CFMutableArray = c_void_p
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CFError = c_void_p
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CFType = c_void_p
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CFTypeID = c_ulong
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CFTypeRef = POINTER(CFType)
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CFAllocatorRef = c_void_p
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OSStatus = c_int32
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CFErrorRef = POINTER(CFError)
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CFDataRef = POINTER(CFData)
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CFStringRef = POINTER(CFString)
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CFArrayRef = POINTER(CFArray)
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CFMutableArrayRef = POINTER(CFMutableArray)
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CFArrayCallBacks = c_void_p
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CFOptionFlags = c_uint32
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SecCertificateRef = POINTER(c_void_p)
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SecPolicyRef = POINTER(c_void_p)
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SecTrustRef = POINTER(c_void_p)
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SecTrustResultType = c_uint32
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SecTrustOptionFlags = c_uint32
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try:
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Security.SecCertificateCreateWithData.argtypes = [CFAllocatorRef, CFDataRef]
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Security.SecCertificateCreateWithData.restype = SecCertificateRef
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Security.SecCertificateCopyData.argtypes = [SecCertificateRef]
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Security.SecCertificateCopyData.restype = CFDataRef
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Security.SecCopyErrorMessageString.argtypes = [OSStatus, c_void_p]
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Security.SecCopyErrorMessageString.restype = CFStringRef
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Security.SecTrustSetAnchorCertificates.argtypes = [SecTrustRef, CFArrayRef]
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Security.SecTrustSetAnchorCertificates.restype = OSStatus
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Security.SecTrustSetAnchorCertificatesOnly.argtypes = [SecTrustRef, Boolean]
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Security.SecTrustSetAnchorCertificatesOnly.restype = OSStatus
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Security.SecTrustEvaluate.argtypes = [SecTrustRef, POINTER(SecTrustResultType)]
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Security.SecTrustEvaluate.restype = OSStatus
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Security.SecPolicyCreateRevocation.argtypes = [CFOptionFlags]
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Security.SecPolicyCreateRevocation.restype = SecPolicyRef
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Security.SecPolicyCreateSSL.argtypes = [Boolean, CFStringRef]
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Security.SecPolicyCreateSSL.restype = SecPolicyRef
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Security.SecTrustCreateWithCertificates.argtypes = [
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CFTypeRef,
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CFTypeRef,
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POINTER(SecTrustRef),
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]
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Security.SecTrustCreateWithCertificates.restype = OSStatus
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Security.SecTrustGetTrustResult.argtypes = [
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SecTrustRef,
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POINTER(SecTrustResultType),
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]
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Security.SecTrustGetTrustResult.restype = OSStatus
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Security.SecTrustRef = SecTrustRef # type: ignore[attr-defined]
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Security.SecTrustResultType = SecTrustResultType # type: ignore[attr-defined]
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Security.OSStatus = OSStatus # type: ignore[attr-defined]
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kSecRevocationUseAnyAvailableMethod = 3
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kSecRevocationRequirePositiveResponse = 8
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CoreFoundation.CFRelease.argtypes = [CFTypeRef]
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CoreFoundation.CFRelease.restype = None
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CoreFoundation.CFGetTypeID.argtypes = [CFTypeRef]
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CoreFoundation.CFGetTypeID.restype = CFTypeID
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CoreFoundation.CFStringCreateWithCString.argtypes = [
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CFAllocatorRef,
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c_char_p,
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CFStringEncoding,
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]
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CoreFoundation.CFStringCreateWithCString.restype = CFStringRef
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CoreFoundation.CFStringGetCStringPtr.argtypes = [CFStringRef, CFStringEncoding]
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CoreFoundation.CFStringGetCStringPtr.restype = c_char_p
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CoreFoundation.CFStringGetCString.argtypes = [
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CFStringRef,
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c_char_p,
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CFIndex,
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CFStringEncoding,
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]
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CoreFoundation.CFStringGetCString.restype = c_bool
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CoreFoundation.CFDataCreate.argtypes = [CFAllocatorRef, c_char_p, CFIndex]
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CoreFoundation.CFDataCreate.restype = CFDataRef
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CoreFoundation.CFDataGetLength.argtypes = [CFDataRef]
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CoreFoundation.CFDataGetLength.restype = CFIndex
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CoreFoundation.CFDataGetBytePtr.argtypes = [CFDataRef]
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CoreFoundation.CFDataGetBytePtr.restype = c_void_p
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CoreFoundation.CFArrayCreate.argtypes = [
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CFAllocatorRef,
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POINTER(CFTypeRef),
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CFIndex,
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CFArrayCallBacks,
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]
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CoreFoundation.CFArrayCreate.restype = CFArrayRef
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CoreFoundation.CFArrayCreateMutable.argtypes = [
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CFAllocatorRef,
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CFIndex,
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CFArrayCallBacks,
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]
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CoreFoundation.CFArrayCreateMutable.restype = CFMutableArrayRef
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CoreFoundation.CFArrayAppendValue.argtypes = [CFMutableArrayRef, c_void_p]
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CoreFoundation.CFArrayAppendValue.restype = None
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CoreFoundation.CFArrayGetCount.argtypes = [CFArrayRef]
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CoreFoundation.CFArrayGetCount.restype = CFIndex
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CoreFoundation.CFArrayGetValueAtIndex.argtypes = [CFArrayRef, CFIndex]
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CoreFoundation.CFArrayGetValueAtIndex.restype = c_void_p
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CoreFoundation.CFErrorGetCode.argtypes = [CFErrorRef]
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CoreFoundation.CFErrorGetCode.restype = CFIndex
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CoreFoundation.CFErrorCopyDescription.argtypes = [CFErrorRef]
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CoreFoundation.CFErrorCopyDescription.restype = CFStringRef
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CoreFoundation.kCFAllocatorDefault = CFAllocatorRef.in_dll( # type: ignore[attr-defined]
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CoreFoundation, "kCFAllocatorDefault"
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)
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CoreFoundation.kCFTypeArrayCallBacks = c_void_p.in_dll( # type: ignore[attr-defined]
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CoreFoundation, "kCFTypeArrayCallBacks"
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)
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CoreFoundation.CFTypeRef = CFTypeRef # type: ignore[attr-defined]
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CoreFoundation.CFArrayRef = CFArrayRef # type: ignore[attr-defined]
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CoreFoundation.CFStringRef = CFStringRef # type: ignore[attr-defined]
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CoreFoundation.CFErrorRef = CFErrorRef # type: ignore[attr-defined]
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except AttributeError:
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raise ImportError("Error initializing ctypes") from None
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def _handle_osstatus(result: OSStatus, _: typing.Any, args: typing.Any) -> typing.Any:
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"""
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Raises an error if the OSStatus value is non-zero.
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"""
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if int(result) == 0:
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return args
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# Returns a CFString which we need to transform
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# into a UTF-8 Python string.
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error_message_cfstring = None
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try:
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error_message_cfstring = Security.SecCopyErrorMessageString(result, None)
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# First step is convert the CFString into a C string pointer.
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# We try the fast no-copy way first.
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error_message_cfstring_c_void_p = ctypes.cast(
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error_message_cfstring, ctypes.POINTER(ctypes.c_void_p)
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)
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message = CoreFoundation.CFStringGetCStringPtr(
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error_message_cfstring_c_void_p, CFConst.kCFStringEncodingUTF8
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)
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# Quoting the Apple dev docs:
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#
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# "A pointer to a C string or NULL if the internal
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# storage of theString does not allow this to be
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# returned efficiently."
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#
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# So we need to get our hands dirty.
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if message is None:
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buffer = ctypes.create_string_buffer(1024)
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result = CoreFoundation.CFStringGetCString(
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error_message_cfstring_c_void_p,
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buffer,
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1024,
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CFConst.kCFStringEncodingUTF8,
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)
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if not result:
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raise OSError("Error copying C string from CFStringRef")
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message = buffer.value
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finally:
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if error_message_cfstring is not None:
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CoreFoundation.CFRelease(error_message_cfstring)
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# If no message can be found for this status we come
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# up with a generic one that forwards the status code.
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if message is None or message == "":
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message = f"SecureTransport operation returned a non-zero OSStatus: {result}"
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raise ssl.SSLError(message)
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Security.SecTrustCreateWithCertificates.errcheck = _handle_osstatus # type: ignore[assignment]
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Security.SecTrustSetAnchorCertificates.errcheck = _handle_osstatus # type: ignore[assignment]
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Security.SecTrustGetTrustResult.errcheck = _handle_osstatus # type: ignore[assignment]
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class CFConst:
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"""CoreFoundation constants"""
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kCFStringEncodingUTF8 = CFStringEncoding(0x08000100)
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errSecIncompleteCertRevocationCheck = -67635
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errSecHostNameMismatch = -67602
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errSecCertificateExpired = -67818
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errSecNotTrusted = -67843
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def _bytes_to_cf_data_ref(value: bytes) -> CFDataRef: # type: ignore[valid-type]
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return CoreFoundation.CFDataCreate( # type: ignore[no-any-return]
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CoreFoundation.kCFAllocatorDefault, value, len(value)
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)
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def _bytes_to_cf_string(value: bytes) -> CFString:
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"""
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Given a Python binary data, create a CFString.
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The string must be CFReleased by the caller.
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"""
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c_str = ctypes.c_char_p(value)
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cf_str = CoreFoundation.CFStringCreateWithCString(
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CoreFoundation.kCFAllocatorDefault,
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c_str,
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CFConst.kCFStringEncodingUTF8,
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)
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return cf_str # type: ignore[no-any-return]
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def _cf_string_ref_to_str(cf_string_ref: CFStringRef) -> str | None: # type: ignore[valid-type]
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"""
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Creates a Unicode string from a CFString object. Used entirely for error
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reporting.
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Yes, it annoys me quite a lot that this function is this complex.
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"""
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string = CoreFoundation.CFStringGetCStringPtr(
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cf_string_ref, CFConst.kCFStringEncodingUTF8
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)
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if string is None:
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buffer = ctypes.create_string_buffer(1024)
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result = CoreFoundation.CFStringGetCString(
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cf_string_ref, buffer, 1024, CFConst.kCFStringEncodingUTF8
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)
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if not result:
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raise OSError("Error copying C string from CFStringRef")
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string = buffer.value
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if string is not None:
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string = string.decode("utf-8")
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return string # type: ignore[no-any-return]
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def _der_certs_to_cf_cert_array(certs: list[bytes]) -> CFMutableArrayRef: # type: ignore[valid-type]
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"""Builds a CFArray of SecCertificateRefs from a list of DER-encoded certificates.
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Responsibility of the caller to call CoreFoundation.CFRelease on the CFArray.
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"""
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cf_array = CoreFoundation.CFArrayCreateMutable(
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CoreFoundation.kCFAllocatorDefault,
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0,
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ctypes.byref(CoreFoundation.kCFTypeArrayCallBacks),
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)
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if not cf_array:
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raise MemoryError("Unable to allocate memory!")
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for cert_data in certs:
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cf_data = None
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sec_cert_ref = None
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try:
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cf_data = _bytes_to_cf_data_ref(cert_data)
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sec_cert_ref = Security.SecCertificateCreateWithData(
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CoreFoundation.kCFAllocatorDefault, cf_data
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)
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CoreFoundation.CFArrayAppendValue(cf_array, sec_cert_ref)
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finally:
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if cf_data:
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CoreFoundation.CFRelease(cf_data)
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if sec_cert_ref:
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CoreFoundation.CFRelease(sec_cert_ref)
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return cf_array # type: ignore[no-any-return]
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@contextlib.contextmanager
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def _configure_context(ctx: ssl.SSLContext) -> typing.Iterator[None]:
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check_hostname = ctx.check_hostname
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verify_mode = ctx.verify_mode
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ctx.check_hostname = False
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_set_ssl_context_verify_mode(ctx, ssl.CERT_NONE)
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try:
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yield
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finally:
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ctx.check_hostname = check_hostname
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_set_ssl_context_verify_mode(ctx, verify_mode)
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def _verify_peercerts_impl(
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ssl_context: ssl.SSLContext,
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cert_chain: list[bytes],
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server_hostname: str | None = None,
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) -> None:
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certs = None
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policies = None
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trust = None
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cf_error = None
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try:
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if server_hostname is not None:
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cf_str_hostname = None
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try:
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cf_str_hostname = _bytes_to_cf_string(server_hostname.encode("ascii"))
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ssl_policy = Security.SecPolicyCreateSSL(True, cf_str_hostname)
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finally:
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if cf_str_hostname:
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CoreFoundation.CFRelease(cf_str_hostname)
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else:
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ssl_policy = Security.SecPolicyCreateSSL(True, None)
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policies = ssl_policy
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if ssl_context.verify_flags & ssl.VERIFY_CRL_CHECK_CHAIN:
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# Add explicit policy requiring positive revocation checks
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policies = CoreFoundation.CFArrayCreateMutable(
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CoreFoundation.kCFAllocatorDefault,
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0,
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ctypes.byref(CoreFoundation.kCFTypeArrayCallBacks),
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)
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CoreFoundation.CFArrayAppendValue(policies, ssl_policy)
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CoreFoundation.CFRelease(ssl_policy)
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revocation_policy = Security.SecPolicyCreateRevocation(
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kSecRevocationUseAnyAvailableMethod
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| kSecRevocationRequirePositiveResponse
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)
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CoreFoundation.CFArrayAppendValue(policies, revocation_policy)
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CoreFoundation.CFRelease(revocation_policy)
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elif ssl_context.verify_flags & ssl.VERIFY_CRL_CHECK_LEAF:
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raise NotImplementedError("VERIFY_CRL_CHECK_LEAF not implemented for macOS")
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certs = None
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try:
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certs = _der_certs_to_cf_cert_array(cert_chain)
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# Now that we have certificates loaded and a SecPolicy
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# we can finally create a SecTrust object!
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trust = Security.SecTrustRef()
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Security.SecTrustCreateWithCertificates(
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certs, policies, ctypes.byref(trust)
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)
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|
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finally:
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# The certs are now being held by SecTrust so we can
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# release our handles for the array.
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if certs:
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CoreFoundation.CFRelease(certs)
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# If there are additional trust anchors to load we need to transform
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# the list of DER-encoded certificates into a CFArray. Otherwise
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# pass 'None' to signal that we only want system / fetched certificates.
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||
|
ctx_ca_certs_der: list[bytes] | None = ssl_context.get_ca_certs(
|
||
|
binary_form=True
|
||
|
)
|
||
|
if ctx_ca_certs_der:
|
||
|
ctx_ca_certs = None
|
||
|
try:
|
||
|
ctx_ca_certs = _der_certs_to_cf_cert_array(cert_chain)
|
||
|
Security.SecTrustSetAnchorCertificates(trust, ctx_ca_certs)
|
||
|
finally:
|
||
|
if ctx_ca_certs:
|
||
|
CoreFoundation.CFRelease(ctx_ca_certs)
|
||
|
else:
|
||
|
Security.SecTrustSetAnchorCertificates(trust, None)
|
||
|
|
||
|
cf_error = CoreFoundation.CFErrorRef()
|
||
|
sec_trust_eval_result = Security.SecTrustEvaluateWithError(
|
||
|
trust, ctypes.byref(cf_error)
|
||
|
)
|
||
|
# sec_trust_eval_result is a bool (0 or 1)
|
||
|
# where 1 means that the certs are trusted.
|
||
|
if sec_trust_eval_result == 1:
|
||
|
is_trusted = True
|
||
|
elif sec_trust_eval_result == 0:
|
||
|
is_trusted = False
|
||
|
else:
|
||
|
raise ssl.SSLError(
|
||
|
f"Unknown result from Security.SecTrustEvaluateWithError: {sec_trust_eval_result!r}"
|
||
|
)
|
||
|
|
||
|
cf_error_code = 0
|
||
|
if not is_trusted:
|
||
|
cf_error_code = CoreFoundation.CFErrorGetCode(cf_error)
|
||
|
|
||
|
# If the error is a known failure that we're
|
||
|
# explicitly okay with from SSLContext configuration
|
||
|
# we can set is_trusted accordingly.
|
||
|
if ssl_context.verify_mode != ssl.CERT_REQUIRED and (
|
||
|
cf_error_code == CFConst.errSecNotTrusted
|
||
|
or cf_error_code == CFConst.errSecCertificateExpired
|
||
|
):
|
||
|
is_trusted = True
|
||
|
elif (
|
||
|
not ssl_context.check_hostname
|
||
|
and cf_error_code == CFConst.errSecHostNameMismatch
|
||
|
):
|
||
|
is_trusted = True
|
||
|
|
||
|
# If we're still not trusted then we start to
|
||
|
# construct and raise the SSLCertVerificationError.
|
||
|
if not is_trusted:
|
||
|
cf_error_string_ref = None
|
||
|
try:
|
||
|
cf_error_string_ref = CoreFoundation.CFErrorCopyDescription(cf_error)
|
||
|
|
||
|
# Can this ever return 'None' if there's a CFError?
|
||
|
cf_error_message = (
|
||
|
_cf_string_ref_to_str(cf_error_string_ref)
|
||
|
or "Certificate verification failed"
|
||
|
)
|
||
|
|
||
|
# TODO: Not sure if we need the SecTrustResultType for anything?
|
||
|
# We only care whether or not it's a success or failure for now.
|
||
|
sec_trust_result_type = Security.SecTrustResultType()
|
||
|
Security.SecTrustGetTrustResult(
|
||
|
trust, ctypes.byref(sec_trust_result_type)
|
||
|
)
|
||
|
|
||
|
err = ssl.SSLCertVerificationError(cf_error_message)
|
||
|
err.verify_message = cf_error_message
|
||
|
err.verify_code = cf_error_code
|
||
|
raise err
|
||
|
finally:
|
||
|
if cf_error_string_ref:
|
||
|
CoreFoundation.CFRelease(cf_error_string_ref)
|
||
|
|
||
|
finally:
|
||
|
if policies:
|
||
|
CoreFoundation.CFRelease(policies)
|
||
|
if trust:
|
||
|
CoreFoundation.CFRelease(trust)
|