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# coding: utf-8 from __future__ import unicode_literals, division, absolute_import, print_function import sys import re import socket as socket_ import select import numbers from ._libssl import libssl, LibsslConst from ._libcrypto import libcrypto, libcrypto_version_info, handle_openssl_error, peek_openssl_error from .. import _backend_config from .._asn1 import Certificate as Asn1Certificate from .._errors import pretty_message from .._ffi import null, bytes_from_buffer, buffer_from_bytes, is_null, buffer_pointer from .._types import type_name, str_cls, byte_cls, int_types from ..errors import TLSError, TLSDisconnectError, TLSGracefulDisconnectError from .._tls import ( detect_client_auth_request, extract_chain, get_dh_params_length, parse_session_info, raise_client_auth, raise_dh_params, raise_disconnection, raise_expired_not_yet_valid, raise_handshake, raise_hostname, raise_no_issuer, raise_protocol_error, raise_protocol_version, raise_self_signed, raise_verification, raise_weak_signature, parse_tls_records, parse_handshake_messages, ) from .asymmetric import load_certificate, Certificate from ..keys import parse_certificate from ..trust_list import get_path if sys.version_info < (3,): range = xrange # noqa if sys.version_info < (3, 7): Pattern = re._pattern_type else: Pattern = re.Pattern __all__ = [ 'TLSSession', 'TLSSocket', ] _trust_list_path = _backend_config().get('trust_list_path') _line_regex = re.compile(b'(\r\n\|\r\|\n)') _PROTOCOL_MAP = { 'SSLv2': LibsslConst.SSL_OP_NO_SSLv2, 'SSLv3': LibsslConst.SSL_OP_NO_SSLv3, 'TLSv1': LibsslConst.SSL_OP_NO_TLSv1, 'TLSv1.1': LibsslConst.SSL_OP_NO_TLSv1_1, 'TLSv1.2': LibsslConst.SSL_OP_NO_TLSv1_2, } def _homogenize_openssl3_error(error_tuple): """ Takes a 3-element tuple from peek_openssl_error() and modifies it to handle the changes in OpenSSL 3.0. That release removed the concept of an error function, meaning the second item in the tuple will always be 0. :param error_tuple: A 3-element tuple of integers :return: A 3-element tuple of integers """ if libcrypto_version_info < (3,): return error_tuple return (error_tuple[0], 0, error_tuple[2]) class TLSSession(object): """ A TLS session object that multiple TLSSocket objects can share for the sake of session reuse """ _protocols = None _ciphers = None _manual_validation = None _extra_trust_roots = None _ssl_ctx = None _ssl_session = None def __init__(self, protocol=None, manual_validation=False, extra_trust_roots=None): """ :param protocol: A unicode string or set of unicode strings representing allowable protocols to negotiate with the server: - "TLSv1.2" - "TLSv1.1" - "TLSv1" - "SSLv3" Default is: {"TLSv1", "TLSv1.1", "TLSv1.2"} :param manual_validation: If certificate and certificate path validation should be skipped and left to the developer to implement :param extra_trust_roots: A list containing one or more certificates to be treated as trust roots, in one of the following formats: - A byte string of the DER encoded certificate - A unicode string of the certificate filename - An asn1crypto.x509.Certificate object - An oscrypto.asymmetric.Certificate object :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library """ if not isinstance(manual_validation, bool): raise TypeError(pretty_message( ''' manual_validation must be a boolean, not %s ''', type_name(manual_validation) )) self._manual_validation = manual_validation if protocol is None: protocol = set(['TLSv1', 'TLSv1.1', 'TLSv1.2']) if isinstance(protocol, str_cls): protocol = set([protocol]) elif not isinstance(protocol, set): raise TypeError(pretty_message( ''' protocol must be a unicode string or set of unicode strings, not %s ''', type_name(protocol) )) valid_protocols = set(['SSLv3', 'TLSv1', 'TLSv1.1', 'TLSv1.2']) unsupported_protocols = protocol - valid_protocols if unsupported_protocols: raise ValueError(pretty_message( ''' protocol must contain only the unicode strings "SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2", not %s ''', repr(unsupported_protocols) )) self._protocols = protocol self._extra_trust_roots = [] if extra_trust_roots: for extra_trust_root in extra_trust_roots: if isinstance(extra_trust_root, Certificate): extra_trust_root = extra_trust_root.asn1 elif isinstance(extra_trust_root, byte_cls): extra_trust_root = parse_certificate(extra_trust_root) elif isinstance(extra_trust_root, str_cls): with open(extra_trust_root, 'rb') as f: extra_trust_root = parse_certificate(f.read()) elif not isinstance(extra_trust_root, Asn1Certificate): raise TypeError(pretty_message( ''' extra_trust_roots must be a list of byte strings, unicode strings, asn1crypto.x509.Certificate objects or oscrypto.asymmetric.Certificate objects, not %s ''', type_name(extra_trust_root) )) self._extra_trust_roots.append(extra_trust_root) ssl_ctx = None try: if libcrypto_version_info < (1, 1): method = libssl.SSLv23_method() else: method = libssl.TLS_method() ssl_ctx = libssl.SSL_CTX_new(method) if is_null(ssl_ctx): handle_openssl_error(0) self._ssl_ctx = ssl_ctx libssl.SSL_CTX_set_timeout(ssl_ctx, 600) # Allow caching SSL sessions libssl.SSL_CTX_ctrl( ssl_ctx, LibsslConst.SSL_CTRL_SET_SESS_CACHE_MODE, LibsslConst.SSL_SESS_CACHE_CLIENT, null() ) if sys.platform in set(['win32', 'darwin']): trust_list_path = _trust_list_path if trust_list_path is None: trust_list_path = get_path() if sys.platform == 'win32': path_encoding = 'mbcs' else: path_encoding = 'utf-8' result = libssl.SSL_CTX_load_verify_locations( ssl_ctx, trust_list_path.encode(path_encoding), null() ) else: result = libssl.SSL_CTX_set_default_verify_paths(ssl_ctx) handle_openssl_error(result) verify_mode = LibsslConst.SSL_VERIFY_NONE if manual_validation else LibsslConst.SSL_VERIFY_PEER libssl.SSL_CTX_set_verify(ssl_ctx, verify_mode, null()) # Modern cipher suite list from https://wiki.mozilla.org/Security/Server_Side_TLS late August 2015 result = libssl.SSL_CTX_set_cipher_list( ssl_ctx, ( b'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:' b'ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:' b'DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:' b'kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:' b'ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:' b'ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:' b'DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:' b'DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:' b'AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:' b'AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:' b'!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:' b'!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA' ) ) handle_openssl_error(result) disabled_protocols = set(['SSLv2']) disabled_protocols \|= (valid_protocols - self._protocols) for disabled_protocol in disabled_protocols: libssl.SSL_CTX_ctrl( ssl_ctx, LibsslConst.SSL_CTRL_OPTIONS, _PROTOCOL_MAP[disabled_protocol], null() ) if self._extra_trust_roots: x509_store = libssl.SSL_CTX_get_cert_store(ssl_ctx) for cert in self._extra_trust_roots: oscrypto_cert = load_certificate(cert) result = libssl.X509_STORE_add_cert( x509_store, oscrypto_cert.x509 ) handle_openssl_error(result) except (Exception): if ssl_ctx: libssl.SSL_CTX_free(ssl_ctx) self._ssl_ctx = None raise def __del__(self): if self._ssl_ctx: libssl.SSL_CTX_free(self._ssl_ctx) self._ssl_ctx = None if self._ssl_session: libssl.SSL_SESSION_free(self._ssl_session) self._ssl_session = None class TLSSocket(object): """ A wrapper around a socket.socket that adds TLS """ _socket = None # An oscrypto.tls.TLSSession object _session = None # An OpenSSL SSL struct pointer _ssl = None # OpenSSL memory bios used for reading/writing data to and # from the socket _rbio = None _wbio = None # Size of _bio_write_buffer and _read_buffer _buffer_size = 8192 # A buffer used to pull bytes out of the _wbio memory bio to # be written to the socket _bio_write_buffer = None # A buffer used to push bytes into the _rbio memory bio to # be decrypted by OpenSSL _read_buffer = None # Raw ciphertext from the socker that hasn't need fed to OpenSSL yet _raw_bytes = None # Plaintext that has been decrypted, but not asked for yet _decrypted_bytes = None _hostname = None _certificate = None _intermediates = None _protocol = None _cipher_suite = None _compression = None _session_id = None _session_ticket = None # If we explicitly asked for the connection to be closed _local_closed = False _gracefully_closed = False @classmethod def wrap(cls, socket, hostname, session=None): """ Takes an existing socket and adds TLS :param socket: A socket.socket object to wrap with TLS :param hostname: A unicode string of the hostname or IP the socket is connected to :param session: An existing TLSSession object to allow for session reuse, specific protocol or manual certificate validation :raises: ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library """ if not isinstance(socket, socket_.socket): raise TypeError(pretty_message( ''' socket must be an instance of socket.socket, not %s ''', type_name(socket) )) if not isinstance(hostname, str_cls): raise TypeError(pretty_message( ''' hostname must be a unicode string, not %s ''', type_name(hostname) )) if session is not None and not isinstance(session, TLSSession): raise TypeError(pretty_message( ''' session must be an instance of oscrypto.tls.TLSSession, not %s ''', type_name(session) )) new_socket = cls(None, None, session=session) new_socket._socket = socket new_socket._hostname = hostname new_socket._handshake() return new_socket def __init__(self, address, port, timeout=10, session=None): """ :param address: A unicode string of the domain name or IP address to connect to :param port: An integer of the port number to connect to :param timeout: An integer timeout to use for the socket :param session: An oscrypto.tls.TLSSession object to allow for session reuse and controlling the protocols and validation performed """ self._raw_bytes = b'' self._decrypted_bytes = b'' if address is None and port is None: self._socket = None else: if not isinstance(address, str_cls): raise TypeError(pretty_message( ''' address must be a unicode string, not %s ''', type_name(address) )) if not isinstance(port, int_types): raise TypeError(pretty_message( ''' port must be an integer, not %s ''', type_name(port) )) if timeout is not None and not isinstance(timeout, numbers.Number): raise TypeError(pretty_message( ''' timeout must be a number, not %s ''', type_name(timeout) )) self._socket = socket_.create_connection((address, port), timeout) self._socket.settimeout(timeout) if session is None: session = TLSSession() elif not isinstance(session, TLSSession): raise TypeError(pretty_message( ''' session must be an instance of oscrypto.tls.TLSSession, not %s ''', type_name(session) )) self._session = session if self._socket: self._hostname = address self._handshake() def _handshake(self): """ Perform an initial TLS handshake """ self._ssl = None self._rbio = None self._wbio = None try: self._ssl = libssl.SSL_new(self._session._ssl_ctx) if is_null(self._ssl): self._ssl = None handle_openssl_error(0) mem_bio = libssl.BIO_s_mem() self._rbio = libssl.BIO_new(mem_bio) if is_null(self._rbio): handle_openssl_error(0) self._wbio = libssl.BIO_new(mem_bio) if is_null(self._wbio): handle_openssl_error(0) libssl.SSL_set_bio(self._ssl, self._rbio, self._wbio) utf8_domain = self._hostname.encode('utf-8') libssl.SSL_ctrl( self._ssl, LibsslConst.SSL_CTRL_SET_TLSEXT_HOSTNAME, LibsslConst.TLSEXT_NAMETYPE_host_name, utf8_domain ) libssl.SSL_set_connect_state(self._ssl) if self._session._ssl_session: libssl.SSL_set_session(self._ssl, self._session._ssl_session) self._bio_write_buffer = buffer_from_bytes(self._buffer_size) self._read_buffer = buffer_from_bytes(self._buffer_size) handshake_server_bytes = b'' handshake_client_bytes = b'' while True: result = libssl.SSL_do_handshake(self._ssl) handshake_client_bytes += self._raw_write() if result == 1: break error = libssl.SSL_get_error(self._ssl, result) if error == LibsslConst.SSL_ERROR_WANT_READ: chunk = self._raw_read() if chunk == b'': if handshake_server_bytes == b'': raise_disconnection() if detect_client_auth_request(handshake_server_bytes): raise_client_auth() raise_protocol_error(handshake_server_bytes) handshake_server_bytes += chunk elif error == LibsslConst.SSL_ERROR_WANT_WRITE: handshake_client_bytes += self._raw_write() elif error == LibsslConst.SSL_ERROR_ZERO_RETURN: self._gracefully_closed = True self._shutdown(False) self._raise_closed() else: info = peek_openssl_error() dh_key_info_1 = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, LibsslConst.SSL_R_DH_KEY_TOO_SMALL ) dh_key_info_1 = _homogenize_openssl3_error(dh_key_info_1) dh_key_info_2 = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_TLS_PROCESS_SKE_DHE, LibsslConst.SSL_R_DH_KEY_TOO_SMALL ) dh_key_info_2 = _homogenize_openssl3_error(dh_key_info_2) dh_key_info_3 = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL3_GET_KEY_EXCHANGE, LibsslConst.SSL_R_BAD_DH_P_LENGTH ) dh_key_info_3 = _homogenize_openssl3_error(dh_key_info_3) if info == dh_key_info_1 or info == dh_key_info_2 or info == dh_key_info_3: raise_dh_params() if libcrypto_version_info < (1, 1): unknown_protocol_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL23_GET_SERVER_HELLO, LibsslConst.SSL_R_UNKNOWN_PROTOCOL ) else: unknown_protocol_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL3_GET_RECORD, LibsslConst.SSL_R_WRONG_VERSION_NUMBER ) unknown_protocol_info = _homogenize_openssl3_error(unknown_protocol_info) if info == unknown_protocol_info: raise_protocol_error(handshake_server_bytes) tls_version_info_error = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL23_GET_SERVER_HELLO, LibsslConst.SSL_R_TLSV1_ALERT_PROTOCOL_VERSION ) tls_version_info_error = _homogenize_openssl3_error(tls_version_info_error) if info == tls_version_info_error: raise_protocol_version() handshake_error_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL23_GET_SERVER_HELLO, LibsslConst.SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE ) # OpenSSL 3.0 no longer has func codes, so this can be confused # with the following handler which needs to check for client auth if libcrypto_version_info < (3, ) and info == handshake_error_info: raise_handshake() handshake_failure_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL3_READ_BYTES, LibsslConst.SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE ) handshake_failure_info = _homogenize_openssl3_error(handshake_failure_info) if info == handshake_failure_info: saw_client_auth = False for record_type, _, record_data in parse_tls_records(handshake_server_bytes): if record_type != b'\x16': continue for message_type, message_data in parse_handshake_messages(record_data): if message_type == b'\x0d': saw_client_auth = True break if saw_client_auth: raise_client_auth() raise_handshake() if libcrypto_version_info < (1, 1): cert_verify_failed_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_SSL3_GET_SERVER_CERTIFICATE, LibsslConst.SSL_R_CERTIFICATE_VERIFY_FAILED ) else: cert_verify_failed_info = ( LibsslConst.ERR_LIB_SSL, LibsslConst.SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, LibsslConst.SSL_R_CERTIFICATE_VERIFY_FAILED ) cert_verify_failed_info = _homogenize_openssl3_error(cert_verify_failed_info) # It would appear that some versions of OpenSSL (such as on Fedora 30) # don't even have the MD5 digest algorithm included any longer? To # give a more useful error message we handle this specifically. unknown_hash_algo_info = ( LibsslConst.ERR_LIB_ASN1, LibsslConst.ASN1_F_ASN1_ITEM_VERIFY, LibsslConst.ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM ) unknown_hash_algo_info = _homogenize_openssl3_error(unknown_hash_algo_info) if info == unknown_hash_algo_info: chain = extract_chain(handshake_server_bytes) if chain: cert = chain[0] oscrypto_cert = load_certificate(cert) if oscrypto_cert.asn1.hash_algo in set(['md5', 'md2']): raise_weak_signature(oscrypto_cert) if info == cert_verify_failed_info: verify_result = libssl.SSL_get_verify_result(self._ssl) chain = extract_chain(handshake_server_bytes) self_signed = False time_invalid = False no_issuer = False cert = None oscrypto_cert = None if chain: cert = chain[0] oscrypto_cert = load_certificate(cert) self_signed = oscrypto_cert.self_signed issuer_error_codes = set([ LibsslConst.X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT, LibsslConst.X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN, LibsslConst.X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY ]) if verify_result in issuer_error_codes: no_issuer = not self_signed time_error_codes = set([ LibsslConst.X509_V_ERR_CERT_HAS_EXPIRED, LibsslConst.X509_V_ERR_CERT_NOT_YET_VALID ]) time_invalid = verify_result in time_error_codes if time_invalid: raise_expired_not_yet_valid(cert) if no_issuer: raise_no_issuer(cert) if self_signed: raise_self_signed(cert) if oscrypto_cert and oscrypto_cert.asn1.hash_algo in set(['md5', 'md2']): raise_weak_signature(oscrypto_cert) raise_verification(cert) handle_openssl_error(0, TLSError) session_info = parse_session_info( handshake_server_bytes, handshake_client_bytes ) self._protocol = session_info['protocol'] self._cipher_suite = session_info['cipher_suite'] self._compression = session_info['compression'] self._session_id = session_info['session_id'] self._session_ticket = session_info['session_ticket'] if self._cipher_suite.find('_DHE_') != -1: dh_params_length = get_dh_params_length(handshake_server_bytes) if dh_params_length < 1024: self.close() raise_dh_params() # When saving the session for future requests, we use # SSL_get1_session() variant to increase the reference count. This # prevents the session from being freed when one connection closes # before another is opened. However, since we increase the ref # count, we also have to explicitly free any previous session. if self._session_id == 'new' or self._session_ticket == 'new': if self._session._ssl_session: libssl.SSL_SESSION_free(self._session._ssl_session) self._session._ssl_session = libssl.SSL_get1_session(self._ssl) if not self._session._manual_validation: if self.certificate.hash_algo in set(['md5', 'md2']): raise_weak_signature(self.certificate) # OpenSSL does not do hostname or IP address checking in the end # entity certificate, so we must perform that check if not self.certificate.is_valid_domain_ip(self._hostname): raise_hostname(self.certificate, self._hostname) except (OSError, socket_.error): if self._ssl: libssl.SSL_free(self._ssl) self._ssl = None self._rbio = None self._wbio = None # The BIOs are freed by SSL_free(), so we only need to free # them if for some reason SSL_free() was not called else: if self._rbio: libssl.BIO_free(self._rbio) self._rbio = None if self._wbio: libssl.BIO_free(self._wbio) self._wbio = None self.close() raise def _raw_read(self): """ Reads data from the socket and writes it to the memory bio used by libssl to decrypt the data. Returns the unencrypted data for the purpose of debugging handshakes. :return: A byte string of ciphertext from the socket. Used for debugging the handshake only. """ data = self._raw_bytes try: data += self._socket.recv(8192) except (socket_.error): pass output = data written = libssl.BIO_write(self._rbio, data, len(data)) self._raw_bytes = data[written:] return output def _raw_write(self): """ Takes ciphertext from the memory bio and writes it to the socket. :return: A byte string of ciphertext going to the socket. Used for debugging the handshake only. """ data_available = libssl.BIO_ctrl_pending(self._wbio) if data_available == 0: return b'' to_read = min(self._buffer_size, data_available) read = libssl.BIO_read(self._wbio, self._bio_write_buffer, to_read) to_write = bytes_from_buffer(self._bio_write_buffer, read) output = to_write while len(to_write): raise_disconnect = False try: sent = self._socket.send(to_write) except (socket_.error) as e: # Handle ECONNRESET and EPIPE if e.errno == 104 or e.errno == 32: raise_disconnect = True # Handle EPROTOTYPE. Newer versions of macOS will return this # if we try to call send() while the socket is being torn down elif sys.platform == 'darwin' and e.errno == 41: raise_disconnect = True else: raise if raise_disconnect: raise_disconnection() to_write = to_write[sent:] if len(to_write): self.select_write() return output def read(self, max_length): """ Reads data from the TLS-wrapped socket :param max_length: The number of bytes to read - output may be less than this :raises: socket.socket - when a non-TLS socket error occurs oscrypto.errors.TLSError - when a TLS-related error occurs ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library :return: A byte string of the data read """ if not isinstance(max_length, int_types): raise TypeError(pretty_message( ''' max_length must be an integer, not %s ''', type_name(max_length) )) buffered_length = len(self._decrypted_bytes) # If we already have enough buffered data, just use that if buffered_length >= max_length: output = self._decrypted_bytes[0:max_length] self._decrypted_bytes = self._decrypted_bytes[max_length:] return output if self._ssl is None: self._raise_closed() # Don't block if we have buffered data available, since it is ok to # return less than the max_length if buffered_length > 0 and not self.select_read(0): output = self._decrypted_bytes self._decrypted_bytes = b'' return output # Only read enough to get the requested amount when # combined with buffered data to_read = min(self._buffer_size, max_length - buffered_length) output = self._decrypted_bytes # The SSL_read() loop handles renegotiations, so we need to handle # requests for both reads and writes again = True while again: again = False result = libssl.SSL_read(self._ssl, self._read_buffer, to_read) self._raw_write() if result <= 0: error = libssl.SSL_get_error(self._ssl, result) if error == LibsslConst.SSL_ERROR_WANT_READ: if self._raw_read() != b'': again = True continue raise_disconnection() elif error == LibsslConst.SSL_ERROR_WANT_WRITE: self._raw_write() again = True continue elif error == LibsslConst.SSL_ERROR_ZERO_RETURN: self._gracefully_closed = True self._shutdown(False) break else: handle_openssl_error(0, TLSError) output += bytes_from_buffer(self._read_buffer, result) if self._gracefully_closed and len(output) == 0: self._raise_closed() self._decrypted_bytes = output[max_length:] return output[0:max_length] def select_read(self, timeout=None): """ Blocks until the socket is ready to be read from, or the timeout is hit :param timeout: A float - the period of time to wait for data to be read. None for no time limit. :return: A boolean - if data is ready to be read. Will only be False if timeout is not None. """ # If we have buffered data, we consider a read possible if len(self._decrypted_bytes) > 0: return True read_ready, _, _ = select.select([self._socket], [], [], timeout) return len(read_ready) > 0 def read_until(self, marker): """ Reads data from the socket until a marker is found. Data read includes the marker. :param marker: A byte string or regex object from re.compile(). Used to determine when to stop reading. Regex objects are more inefficient since they must scan the entire byte string of read data each time data is read off the socket. :return: A byte string of the data read, including the marker """ if not isinstance(marker, byte_cls) and not isinstance(marker, Pattern): raise TypeError(pretty_message( ''' marker must be a byte string or compiled regex object, not %s ''', type_name(marker) )) output = b'' is_regex = isinstance(marker, Pattern) while True: if len(self._decrypted_bytes) > 0: chunk = self._decrypted_bytes self._decrypted_bytes = b'' else: if self._ssl is None: self._raise_closed() to_read = libssl.SSL_pending(self._ssl) or 8192 chunk = self.read(to_read) offset = len(output) output += chunk if is_regex: match = marker.search(output) if match is not None: end = match.end() break else: # If the marker was not found last time, we have to start # at a position where the marker would have its final char # in the newly read chunk start = max(0, offset - len(marker) - 1) match = output.find(marker, start) if match != -1: end = match + len(marker) break self._decrypted_bytes = output[end:] + self._decrypted_bytes return output[0:end] def read_line(self): r""" Reads a line from the socket, including the line ending of "\r\n", "\r", or "\n" :return: A byte string of the next line from the socket """ return self.read_until(_line_regex) def read_exactly(self, num_bytes): """ Reads exactly the specified number of bytes from the socket :param num_bytes: An integer - the exact number of bytes to read :return: A byte string of the data that was read """ output = b'' remaining = num_bytes while remaining > 0: output += self.read(remaining) remaining = num_bytes - len(output) return output def write(self, data): """ Writes data to the TLS-wrapped socket :param data: A byte string to write to the socket :raises: socket.socket - when a non-TLS socket error occurs oscrypto.errors.TLSError - when a TLS-related error occurs ValueError - when any of the parameters contain an invalid value TypeError - when any of the parameters are of the wrong type OSError - when an error is returned by the OS crypto library """ data_len = len(data) while data_len: if self._ssl is None: self._raise_closed() result = libssl.SSL_write(self._ssl, data, data_len) self._raw_write() if result <= 0: error = libssl.SSL_get_error(self._ssl, result) if error == LibsslConst.SSL_ERROR_WANT_READ: if self._raw_read() != b'': continue raise_disconnection() elif error == LibsslConst.SSL_ERROR_WANT_WRITE: self._raw_write() continue elif error == LibsslConst.SSL_ERROR_ZERO_RETURN: self._gracefully_closed = True self._shutdown(False) self._raise_closed() else: handle_openssl_error(0, TLSError) data = data[result:] data_len = len(data) def select_write(self, timeout=None): """ Blocks until the socket is ready to be written to, or the timeout is hit :param timeout: A float - the period of time to wait for the socket to be ready to written to. None for no time limit. :return: A boolean - if the socket is ready for writing. Will only be False if timeout is not None. """ _, write_ready, _ = select.select([], [self._socket], [], timeout) return len(write_ready) > 0 def _shutdown(self, manual): """ Shuts down the TLS session and then shuts down the underlying socket :param manual: A boolean if the connection was manually shutdown """ if self._ssl is None: return while True: result = libssl.SSL_shutdown(self._ssl) # Don't be noisy if the socket is already closed try: self._raw_write() except (TLSDisconnectError): pass if result >= 0: break if result < 0: error = libssl.SSL_get_error(self._ssl, result) if error == LibsslConst.SSL_ERROR_WANT_READ: if self._raw_read() != b'': continue else: break elif error == LibsslConst.SSL_ERROR_WANT_WRITE: self._raw_write() continue else: handle_openssl_error(0, TLSError) if manual: self._local_closed = True libssl.SSL_free(self._ssl) self._ssl = None # BIOs are freed by SSL_free() self._rbio = None self._wbio = None try: self._socket.shutdown(socket_.SHUT_RDWR) except (socket_.error): pass def shutdown(self): """ Shuts down the TLS session and then shuts down the underlying socket """ self._shutdown(True) def close(self): """ Shuts down the TLS session and socket and forcibly closes it """ try: self.shutdown() finally: if self._socket: try: self._socket.close() except (socket_.error): pass self._socket = None def _read_certificates(self): """ Reads end-entity and intermediate certificate information from the TLS session """ stack_pointer = libssl.SSL_get_peer_cert_chain(self._ssl) if is_null(stack_pointer): handle_openssl_error(0, TLSError) if libcrypto_version_info < (1, 1): number_certs = libssl.sk_num(stack_pointer) else: number_certs = libssl.OPENSSL_sk_num(stack_pointer) self._intermediates = [] for index in range(0, number_certs): if libcrypto_version_info < (1, 1): x509_ = libssl.sk_value(stack_pointer, index) else: x509_ = libssl.OPENSSL_sk_value(stack_pointer, index) buffer_size = libcrypto.i2d_X509(x509_, null()) cert_buffer = buffer_from_bytes(buffer_size) cert_pointer = buffer_pointer(cert_buffer) cert_length = libcrypto.i2d_X509(x509_, cert_pointer) handle_openssl_error(cert_length) cert_data = bytes_from_buffer(cert_buffer, cert_length) cert = Asn1Certificate.load(cert_data) if index == 0: self._certificate = cert else: self._intermediates.append(cert) def _raise_closed(self): """ Raises an exception describing if the local or remote end closed the connection """ if self._local_closed: raise TLSDisconnectError('The connection was already closed') elif self._gracefully_closed: raise TLSGracefulDisconnectError('The remote end closed the connection') else: raise TLSDisconnectError('The connection was closed') @property def certificate(self): """ An asn1crypto.x509.Certificate object of the end-entity certificate presented by the server """ if self._ssl is None: self._raise_closed() if self._certificate is None: self._read_certificates() return self._certificate @property def intermediates(self): """ A list of asn1crypto.x509.Certificate objects that were presented as intermediates by the server """ if self._ssl is None: self._raise_closed() if self._certificate is None: self._read_certificates() return self._intermediates @property def cipher_suite(self): """ A unicode string of the IANA cipher suite name of the negotiated cipher suite """ return self._cipher_suite @property def protocol(self): """ A unicode string of: "TLSv1.2", "TLSv1.1", "TLSv1", "SSLv3" """ return self._protocol @property def compression(self): """ A boolean if compression is enabled """ return self._compression @property def session_id(self): """ A unicode string of "new" or "reused" or None for no ticket """ return self._session_id @property def session_ticket(self): """ A unicode string of "new" or "reused" or None for no ticket """ return self._session_ticket @property def session(self): """ The oscrypto.tls.TLSSession object used for this connection """ return self._session @property def hostname(self): """ A unicode string of the TLS server domain name or IP address """ return self._hostname @property def port(self): """ An integer of the port number the socket is connected to """ return self.socket.getpeername()[1] @property def socket(self): """ The underlying socket.socket connection """ if self._ssl is None: self._raise_closed() return self._socket def __del__(self): self.close()

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