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bindings.py
""" This module uses ctypes to bind a whole bunch of functions and constants from SecureTransport. The goal here is to provide the low-level API to SecureTransport. These are essentially the C-level functions and constants, and they're pretty gross to work with. This code is a bastardised version of the code found in Will Bond's oscrypto library. An enormous debt is owed to him for blazing this trail for us. For that reason, this code should be considered to be covered both by urllib3's license and by oscrypto's: Copyright (c) 2015-2016 Will Bond <will@wbond.net> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ from __future__ import absolute_import import platform from ctypes import ( CDLL, CFUNCTYPE, POINTER, c_bool, c_byte, c_char_p, c_int32, c_long, c_size_t, c_uint32, c_ulong, c_void_p, ) from ctypes.util import find_library from urllib3.packages.six import raise_from if platform.system() != "Darwin": raise ImportError("Only macOS is supported") version = platform.mac_ver()[0] version_info = tuple(map(int, version.split("."))) if version_info < (10, 8): raise OSError( "Only OS X 10.8 and newer are supported, not %s.%s" % (version_info[0], version_info[1]) ) def load_cdll(name, macos10_16_path): """Loads a CDLL by name, falling back to known path on 10.16+""" try: # Big Sur is technically 11 but we use 10.16 due to the Big Sur # beta being labeled as 10.16. if version_info >= (10, 16): path = macos10_16_path else: path = find_library(name) if not path: raise OSError # Caught and reraised as 'ImportError' return CDLL(path, use_errno=True) except OSError: raise_from(ImportError("The library %s failed to load" % name), None) Security = load_cdll( "Security", "/System/Library/Frameworks/Security.framework/Security" ) CoreFoundation = load_cdll( "CoreFoundation", "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation", ) Boolean = c_bool CFIndex = c_long CFStringEncoding = c_uint32 CFData = c_void_p CFString = c_void_p CFArray = c_void_p CFMutableArray = c_void_p CFDictionary = c_void_p CFError = c_void_p CFType = c_void_p CFTypeID = c_ulong CFTypeRef = POINTER(CFType) CFAllocatorRef = c_void_p OSStatus = c_int32 CFDataRef = POINTER(CFData) CFStringRef = POINTER(CFString) CFArrayRef = POINTER(CFArray) CFMutableArrayRef = POINTER(CFMutableArray) CFDictionaryRef = POINTER(CFDictionary) CFArrayCallBacks = c_void_p CFDictionaryKeyCallBacks = c_void_p CFDictionaryValueCallBacks = c_void_p SecCertificateRef = POINTER(c_void_p) SecExternalFormat = c_uint32 SecExternalItemType = c_uint32 SecIdentityRef = POINTER(c_void_p) SecItemImportExportFlags = c_uint32 SecItemImportExportKeyParameters = c_void_p SecKeychainRef = POINTER(c_void_p) SSLProtocol = c_uint32 SSLCipherSuite = c_uint32 SSLContextRef = POINTER(c_void_p) SecTrustRef = POINTER(c_void_p) SSLConnectionRef = c_uint32 SecTrustResultType = c_uint32 SecTrustOptionFlags = c_uint32 SSLProtocolSide = c_uint32 SSLConnectionType = c_uint32 SSLSessionOption = c_uint32 try: Security.SecItemImport.argtypes = [ CFDataRef, CFStringRef, POINTER(SecExternalFormat), POINTER(SecExternalItemType), SecItemImportExportFlags, POINTER(SecItemImportExportKeyParameters), SecKeychainRef, POINTER(CFArrayRef), ] Security.SecItemImport.restype = OSStatus Security.SecCertificateGetTypeID.argtypes = [] Security.SecCertificateGetTypeID.restype = CFTypeID Security.SecIdentityGetTypeID.argtypes = [] Security.SecIdentityGetTypeID.restype = CFTypeID Security.SecKeyGetTypeID.argtypes = [] Security.SecKeyGetTypeID.restype = CFTypeID Security.SecCertificateCreateWithData.argtypes = [CFAllocatorRef, CFDataRef] Security.SecCertificateCreateWithData.restype = SecCertificateRef Security.SecCertificateCopyData.argtypes = [SecCertificateRef] Security.SecCertificateCopyData.restype = CFDataRef Security.SecCopyErrorMessageString.argtypes = [OSStatus, c_void_p] Security.SecCopyErrorMessageString.restype = CFStringRef Security.SecIdentityCreateWithCertificate.argtypes = [ CFTypeRef, SecCertificateRef, POINTER(SecIdentityRef), ] Security.SecIdentityCreateWithCertificate.restype = OSStatus Security.SecKeychainCreate.argtypes = [ c_char_p, c_uint32, c_void_p, Boolean, c_void_p, POINTER(SecKeychainRef), ] Security.SecKeychainCreate.restype = OSStatus Security.SecKeychainDelete.argtypes = [SecKeychainRef] Security.SecKeychainDelete.restype = OSStatus Security.SecPKCS12Import.argtypes = [ CFDataRef, CFDictionaryRef, POINTER(CFArrayRef), ] Security.SecPKCS12Import.restype = OSStatus SSLReadFunc = CFUNCTYPE(OSStatus, SSLConnectionRef, c_void_p, POINTER(c_size_t)) SSLWriteFunc = CFUNCTYPE( OSStatus, SSLConnectionRef, POINTER(c_byte), POINTER(c_size_t) ) Security.SSLSetIOFuncs.argtypes = [SSLContextRef, SSLReadFunc, SSLWriteFunc] Security.SSLSetIOFuncs.restype = OSStatus Security.SSLSetPeerID.argtypes = [SSLContextRef, c_char_p, c_size_t] Security.SSLSetPeerID.restype = OSStatus Security.SSLSetCertificate.argtypes = [SSLContextRef, CFArrayRef] Security.SSLSetCertificate.restype = OSStatus Security.SSLSetCertificateAuthorities.argtypes = [SSLContextRef, CFTypeRef, Boolean] Security.SSLSetCertificateAuthorities.restype = OSStatus Security.SSLSetConnection.argtypes = [SSLContextRef, SSLConnectionRef] Security.SSLSetConnection.restype = OSStatus Security.SSLSetPeerDomainName.argtypes = [SSLContextRef, c_char_p, c_size_t] Security.SSLSetPeerDomainName.restype = OSStatus Security.SSLHandshake.argtypes = [SSLContextRef] Security.SSLHandshake.restype = OSStatus Security.SSLRead.argtypes = [SSLContextRef, c_char_p, c_size_t, POINTER(c_size_t)] Security.SSLRead.restype = OSStatus Security.SSLWrite.argtypes = [SSLContextRef, c_char_p, c_size_t, POINTER(c_size_t)] Security.SSLWrite.restype = OSStatus Security.SSLClose.argtypes = [SSLContextRef] Security.SSLClose.restype = OSStatus Security.SSLGetNumberSupportedCiphers.argtypes = [SSLContextRef, POINTER(c_size_t)] Security.SSLGetNumberSupportedCiphers.restype = OSStatus Security.SSLGetSupportedCiphers.argtypes = [ SSLContextRef, POINTER(SSLCipherSuite), POINTER(c_size_t), ] Security.SSLGetSupportedCiphers.restype = OSStatus Security.SSLSetEnabledCiphers.argtypes = [ SSLContextRef, POINTER(SSLCipherSuite), c_size_t, ] Security.SSLSetEnabledCiphers.restype = OSStatus Security.SSLGetNumberEnabledCiphers.argtype = [SSLContextRef, POINTER(c_size_t)] Security.SSLGetNumberEnabledCiphers.restype = OSStatus Security.SSLGetEnabledCiphers.argtypes = [ SSLContextRef, POINTER(SSLCipherSuite), POINTER(c_size_t), ] Security.SSLGetEnabledCiphers.restype = OSStatus Security.SSLGetNegotiatedCipher.argtypes = [SSLContextRef, POINTER(SSLCipherSuite)] Security.SSLGetNegotiatedCipher.restype = OSStatus Security.SSLGetNegotiatedProtocolVersion.argtypes = [ SSLContextRef, POINTER(SSLProtocol), ] Security.SSLGetNegotiatedProtocolVersion.restype = OSStatus Security.SSLCopyPeerTrust.argtypes = [SSLContextRef, POINTER(SecTrustRef)] Security.SSLCopyPeerTrust.restype = OSStatus Security.SecTrustSetAnchorCertificates.argtypes = [SecTrustRef, CFArrayRef] Security.SecTrustSetAnchorCertificates.restype = OSStatus Security.SecTrustSetAnchorCertificatesOnly.argstypes = [SecTrustRef, Boolean] Security.SecTrustSetAnchorCertificatesOnly.restype = OSStatus Security.SecTrustEvaluate.argtypes = [SecTrustRef, POINTER(SecTrustResultType)] Security.SecTrustEvaluate.restype = OSStatus Security.SecTrustGetCertificateCount.argtypes = [SecTrustRef] Security.SecTrustGetCertificateCount.restype = CFIndex Security.SecTrustGetCertificateAtIndex.argtypes = [SecTrustRef, CFIndex] Security.SecTrustGetCertificateAtIndex.restype = SecCertificateRef Security.SSLCreateContext.argtypes = [ CFAllocatorRef, SSLProtocolSide, SSLConnectionType, ] Security.SSLCreateContext.restype = SSLContextRef Security.SSLSetSessionOption.argtypes = [SSLContextRef, SSLSessionOption, Boolean] Security.SSLSetSessionOption.restype = OSStatus Security.SSLSetProtocolVersionMin.argtypes = [SSLContextRef, SSLProtocol] Security.SSLSetProtocolVersionMin.restype = OSStatus Security.SSLSetProtocolVersionMax.argtypes = [SSLContextRef, SSLProtocol] Security.SSLSetProtocolVersionMax.restype = OSStatus try: Security.SSLSetALPNProtocols.argtypes = [SSLContextRef, CFArrayRef] Security.SSLSetALPNProtocols.restype = OSStatus except AttributeError: # Supported only in 10.12+ pass Security.SecCopyErrorMessageString.argtypes = [OSStatus, c_void_p] Security.SecCopyErrorMessageString.restype = CFStringRef Security.SSLReadFunc = SSLReadFunc Security.SSLWriteFunc = SSLWriteFunc Security.SSLContextRef = SSLContextRef Security.SSLProtocol = SSLProtocol Security.SSLCipherSuite = SSLCipherSuite Security.SecIdentityRef = SecIdentityRef Security.SecKeychainRef = SecKeychainRef Security.SecTrustRef = SecTrustRef Security.SecTrustResultType = SecTrustResultType Security.SecExternalFormat = SecExternalFormat Security.OSStatus = OSStatus Security.kSecImportExportPassphrase = CFStringRef.in_dll( Security, "kSecImportExportPassphrase" ) Security.kSecImportItemIdentity = CFStringRef.in_dll( Security, "kSecImportItemIdentity" ) # CoreFoundation time! CoreFoundation.CFRetain.argtypes = [CFTypeRef] CoreFoundation.CFRetain.restype = CFTypeRef CoreFoundation.CFRelease.argtypes = [CFTypeRef] CoreFoundation.CFRelease.restype = None CoreFoundation.CFGetTypeID.argtypes = [CFTypeRef] CoreFoundation.CFGetTypeID.restype = CFTypeID CoreFoundation.CFStringCreateWithCString.argtypes = [ CFAllocatorRef, c_char_p, CFStringEncoding, ] CoreFoundation.CFStringCreateWithCString.restype = CFStringRef CoreFoundation.CFStringGetCStringPtr.argtypes = [CFStringRef, CFStringEncoding] CoreFoundation.CFStringGetCStringPtr.restype = c_char_p CoreFoundation.CFStringGetCString.argtypes = [ CFStringRef, c_char_p, CFIndex, CFStringEncoding, ] CoreFoundation.CFStringGetCString.restype = c_bool CoreFoundation.CFDataCreate.argtypes = [CFAllocatorRef, c_char_p, CFIndex] CoreFoundation.CFDataCreate.restype = CFDataRef CoreFoundation.CFDataGetLength.argtypes = [CFDataRef] CoreFoundation.CFDataGetLength.restype = CFIndex CoreFoundation.CFDataGetBytePtr.argtypes = [CFDataRef] CoreFoundation.CFDataGetBytePtr.restype = c_void_p CoreFoundation.CFDictionaryCreate.argtypes = [ CFAllocatorRef, POINTER(CFTypeRef), POINTER(CFTypeRef), CFIndex, CFDictionaryKeyCallBacks, CFDictionaryValueCallBacks, ] CoreFoundation.CFDictionaryCreate.restype = CFDictionaryRef CoreFoundation.CFDictionaryGetValue.argtypes = [CFDictionaryRef, CFTypeRef] CoreFoundation.CFDictionaryGetValue.restype = CFTypeRef CoreFoundation.CFArrayCreate.argtypes = [ CFAllocatorRef, POINTER(CFTypeRef), CFIndex, CFArrayCallBacks, ] CoreFoundation.CFArrayCreate.restype = CFArrayRef CoreFoundation.CFArrayCreateMutable.argtypes = [ CFAllocatorRef, CFIndex, CFArrayCallBacks, ] CoreFoundation.CFArrayCreateMutable.restype = CFMutableArrayRef CoreFoundation.CFArrayAppendValue.argtypes = [CFMutableArrayRef, c_void_p] CoreFoundation.CFArrayAppendValue.restype = None CoreFoundation.CFArrayGetCount.argtypes = [CFArrayRef] CoreFoundation.CFArrayGetCount.restype = CFIndex CoreFoundation.CFArrayGetValueAtIndex.argtypes = [CFArrayRef, CFIndex] CoreFoundation.CFArrayGetValueAtIndex.restype = c_void_p CoreFoundation.kCFAllocatorDefault = CFAllocatorRef.in_dll( CoreFoundation, "kCFAllocatorDefault" ) CoreFoundation.kCFTypeArrayCallBacks = c_void_p.in_dll( CoreFoundation, "kCFTypeArrayCallBacks" ) CoreFoundation.kCFTypeDictionaryKeyCallBacks = c_void_p.in_dll( CoreFoundation, "kCFTypeDictionaryKeyCallBacks" ) CoreFoundation.kCFTypeDictionaryValueCallBacks = c_void_p.in_dll( CoreFoundation, "kCFTypeDictionaryValueCallBacks" ) CoreFoundation.CFTypeRef = CFTypeRef CoreFoundation.CFArrayRef = CFArrayRef CoreFoundation.CFStringRef = CFStringRef CoreFoundation.CFDictionaryRef = CFDictionaryRef except (AttributeError): raise ImportError("Error initializing ctypes") class CFConst(object): """ A class object that acts as essentially a namespace for CoreFoundation constants. """ kCFStringEncodingUTF8 = CFStringEncoding(0x08000100) class SecurityConst(object): """ A class object that acts as essentially a namespace for Security constants. """ kSSLSessionOptionBreakOnServerAuth = 0 kSSLProtocol2 = 1 kSSLProtocol3 = 2 kTLSProtocol1 = 4 kTLSProtocol11 = 7 kTLSProtocol12 = 8 # SecureTransport does not support TLS 1.3 even if there's a constant for it kTLSProtocol13 = 10 kTLSProtocolMaxSupported = 999 kSSLClientSide = 1 kSSLStreamType = 0 kSecFormatPEMSequence = 10 kSecTrustResultInvalid = 0 kSecTrustResultProceed = 1 # This gap is present on purpose: this was kSecTrustResultConfirm, which # is deprecated. kSecTrustResultDeny = 3 kSecTrustResultUnspecified = 4 kSecTrustResultRecoverableTrustFailure = 5 kSecTrustResultFatalTrustFailure = 6 kSecTrustResultOtherError = 7 errSSLProtocol = -9800 errSSLWouldBlock = -9803 errSSLClosedGraceful = -9805 errSSLClosedNoNotify = -9816 errSSLClosedAbort = -9806 errSSLXCertChainInvalid = -9807 errSSLCrypto = -9809 errSSLInternal = -9810 errSSLCertExpired = -9814 errSSLCertNotYetValid = -9815 errSSLUnknownRootCert = -9812 errSSLNoRootCert = -9813 errSSLHostNameMismatch = -9843 errSSLPeerHandshakeFail = -9824 errSSLPeerUserCancelled = -9839 errSSLWeakPeerEphemeralDHKey = -9850 errSSLServerAuthCompleted = -9841 errSSLRecordOverflow = -9847 errSecVerifyFailed = -67808 errSecNoTrustSettings = -25263 errSecItemNotFound = -25300 errSecInvalidTrustSettings = -25262 # Cipher suites. We only pick the ones our default cipher string allows. # Source: https://developer.apple.com/documentation/security/1550981-ssl_cipher_suite_values TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 = 0xC02C TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 = 0xC030 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 = 0xC02B TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 = 0xC02F TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 = 0xCCA9 TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 = 0xCCA8 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 = 0x009F TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 = 0x009E TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 = 0xC024 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 = 0xC028 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA = 0xC00A TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA = 0xC014 TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 = 0x006B TLS_DHE_RSA_WITH_AES_256_CBC_SHA = 0x0039 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 = 0xC023 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 = 0xC027 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA = 0xC009 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA = 0xC013 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 = 0x0067 TLS_DHE_RSA_WITH_AES_128_CBC_SHA = 0x0033 TLS_RSA_WITH_AES_256_GCM_SHA384 = 0x009D TLS_RSA_WITH_AES_128_GCM_SHA256 = 0x009C TLS_RSA_WITH_AES_256_CBC_SHA256 = 0x003D TLS_RSA_WITH_AES_128_CBC_SHA256 = 0x003C TLS_RSA_WITH_AES_256_CBC_SHA = 0x0035 TLS_RSA_WITH_AES_128_CBC_SHA = 0x002F TLS_AES_128_GCM_SHA256 = 0x1301 TLS_AES_256_GCM_SHA384 = 0x1302 TLS_AES_128_CCM_8_SHA256 = 0x1305 TLS_AES_128_CCM_SHA256 = 0x1304
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