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rpclib.py
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# # This module contains all the RPC-related functions the RHN code uses # # Copyright (c) 2005--2016 Red Hat, Inc. # # This software is licensed to you under the GNU General Public License, # version 2 (GPLv2). There is NO WARRANTY for this software, express or # implied, including the implied warranties of MERCHANTABILITY or FITNESS # FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2 # along with this software; if not, see # http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. # # Red Hat trademarks are not licensed under GPLv2. No permission is # granted to use or replicate Red Hat trademarks that are incorporated # in this software or its documentation. # __version__ = "2.8.62.8.6-8.module_el8.10.0+6858+3ddf28328.module_el8.10.0+6858+3ddf2832" import socket import re import sys from rhn import transports from rhn.i18n import sstr from rhn.UserDictCase import UserDictCase try: # python2 import xmlrpclib from types import ListType, TupleType, StringType, UnicodeType, DictType, DictionaryType from urllib import splittype, splithost except ImportError: # python3 import xmlrpc.client as xmlrpclib ListType = list TupleType = tuple StringType = bytes UnicodeType = str DictType = dict DictionaryType = dict from urllib.parse import splittype, splithost # Redirection handling MAX_REDIRECTIONS = 5 def check_ipv6(n): """ Returns true if n is IPv6 address, false otherwise. """ try: socket.inet_pton(socket.AF_INET6, n) return True except: return False def split_host(hoststring): """ Function used to split host information in an URL per RFC 2396 handle full hostname like user:passwd@host:port """ l = hoststring.split('@', 1) host = None port = None user = None passwd = None if len(l) == 2: hostport = l[1] # userinfo present userinfo = l[0].split(':', 1) user = userinfo[0] if len(userinfo) == 2: passwd = userinfo[1] else: hostport = l[0] # Now parse hostport if hostport[0] == '[': # IPv6 with port host, port = re.split('(?<=\]):', ip_port, 1) host = host.lstrip('[').rstrip(']') elif check_ipv6(hostport): # just IPv6 host = hostport else: # IPv4 arr = hostport.split(':', 1) host = arr[0] if len(arr) == 2: port = arr[1] return (host, port, user, passwd) def get_proxy_info(proxy): if proxy == None: raise ValueError("Host string cannot be null") arr = proxy.split('://', 1) if len(arr) == 2: # scheme found, strip it proxy = arr[1] return split_host(proxy) class MalformedURIError(IOError): pass # Originaly taken from xmlrpclib.ServerProxy, now changed most of the code class Server: """uri [,options] -> a logical connection to an XML-RPC server uri is the connection point on the server, given as scheme://host/target. The standard implementation always supports the "http" scheme. If SSL socket support is available (Python 2.0), it also supports "https". If the target part and the slash preceding it are both omitted, "/RPC2" is assumed. The following options can be given as keyword arguments: transport: a transport factory encoding: the request encoding (default is UTF-8) verbose: verbosity level proxy: use an HTTP proxy username: username for authenticated HTTP proxy password: password for authenticated HTTP proxy All 8-bit strings passed to the server proxy are assumed to use the given encoding. """ # Default factories _transport_class = transports.Transport _transport_class_https = transports.SafeTransport _transport_class_proxy = transports.ProxyTransport _transport_class_https_proxy = transports.SafeProxyTransport def __init__(self, uri, transport=None, encoding=None, verbose=0, proxy=None, username=None, password=None, refreshCallback=None, progressCallback=None, timeout=None): # establish a "logical" server connection # # First parse the proxy information if available # if proxy != None: (ph, pp, pu, pw) = get_proxy_info(proxy) if pp is not None: proxy = "%s:%s" % (ph, pp) else: proxy = ph # username and password will override whatever was passed in the # URL if pu is not None and username is None: username = pu if pw is not None and password is None: password = pw self._uri = sstr(uri) self._refreshCallback = None self._progressCallback = None self._bufferSize = None self._proxy = proxy self._username = username self._password = password self._timeout = timeout if len(__version__.split()) > 1: self.rpc_version = __version__.split()[1] else: self.rpc_version = __version__ self._reset_host_handler_and_type() if transport is None: self._allow_redirect = 1 transport = self.default_transport(self._type, proxy, username, password, timeout) else: # # dont allow redirect on unknow transports, that should be # set up independantly # self._allow_redirect = 0 self._redirected = None self.use_handler_path = 1 self._transport = transport self._trusted_cert_files = [] self._lang = None self._encoding = encoding self._verbose = verbose self.set_refresh_callback(refreshCallback) self.set_progress_callback(progressCallback) # referer, which redirect us to new handler self.send_handler=None self._headers = UserDictCase() def default_transport(self, type, proxy=None, username=None, password=None, timeout=None): if proxy: if type == 'https': transport = self._transport_class_https_proxy(proxy, proxyUsername=username, proxyPassword=password, timeout=timeout) else: transport = self._transport_class_proxy(proxy, proxyUsername=username, proxyPassword=password, timeout=timeout) else: if type == 'https': transport = self._transport_class_https(timeout=timeout) else: transport = self._transport_class(timeout=timeout) return transport def allow_redirect(self, allow): self._allow_redirect = allow def redirected(self): if not self._allow_redirect: return None return self._redirected def set_refresh_callback(self, refreshCallback): self._refreshCallback = refreshCallback self._transport.set_refresh_callback(refreshCallback) def set_buffer_size(self, bufferSize): self._bufferSize = bufferSize self._transport.set_buffer_size(bufferSize) def set_progress_callback(self, progressCallback, bufferSize=16384): self._progressCallback = progressCallback self._transport.set_progress_callback(progressCallback, bufferSize) def _req_body(self, params, methodname): return xmlrpclib.dumps(params, methodname, encoding=self._encoding) def get_response_headers(self): if self._transport: return self._transport.headers_in return None def get_response_status(self): if self._transport: return self._transport.response_status return None def get_response_reason(self): if self._transport: return self._transport.response_reason return None def get_content_range(self): """Returns a dictionary with three values: length: the total length of the entity-body (can be None) first_byte_pos: the position of the first byte (zero based) last_byte_pos: the position of the last byte (zero based) The range is inclusive; that is, a response 8-9/102 means two bytes """ headers = self.get_response_headers() if not headers: return None content_range = headers.get('Content-Range') if not content_range: return None arr = filter(None, content_range.split()) assert arr[0] == "bytes" assert len(arr) == 2 arr = arr[1].split('/') assert len(arr) == 2 brange, total_len = arr if total_len == '*': # Per RFC, the server is allowed to use * if the length of the # entity-body is unknown or difficult to determine total_len = None else: total_len = int(total_len) start, end = brange.split('-') result = { 'length' : total_len, 'first_byte_pos' : int(start), 'last_byte_pos' : int(end), } return result def accept_ranges(self): headers = self.get_response_headers() if not headers: return None if 'Accept-Ranges' in headers: return headers['Accept-Ranges'] return None def _reset_host_handler_and_type(self): """ Reset the attributes: self._host, self._handler, self._type according the value of self._uri. """ # get the url type, uri = splittype(self._uri) if type is None: raise MalformedURIError("missing protocol in uri") # with a real uri passed in, uri will now contain "//hostname..." so we # need at least 3 chars for it to maybe be ok... if len(uri) < 3 or uri[0:2] != "//": raise MalformedURIError if type != None: self._type = type.lower() else: self._type = type if self._type not in ("http", "https"): raise IOError("unsupported XML-RPC protocol") self._host, self._handler = splithost(uri) if not self._handler: self._handler = "/RPC2" def _strip_characters(self, *args): """ Strip characters, which are not allowed according: http://www.w3.org/TR/2006/REC-xml-20060816/#charsets From spec: Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */ """ regexp = r'[\x00-\x09]|[\x0b-\x0c]|[\x0e-\x1f]' result=[] for item in args: item_type = type(item) if item_type == StringType or item_type == UnicodeType: item = re.sub(regexp, '', sstr(item)) elif item_type == TupleType: item = tuple(self._strip_characters(i) for i in item) elif item_type == ListType: item = [self._strip_characters(i) for i in item] elif item_type == DictType or item_type == DictionaryType: item = dict([(self._strip_characters(name, val)) for name, val in item.items()]) # else: some object - should take care of himself # numbers - are safe result.append(item) if len(result) == 1: return result[0] else: return tuple(result) def _request(self, methodname, params): """ Call a method on the remote server we can handle redirections. """ # the loop is used to handle redirections redirect_response = 0 retry = 0 self._reset_host_handler_and_type() while 1: if retry >= MAX_REDIRECTIONS: raise InvalidRedirectionError( "Unable to fetch requested Package") # Clear the transport headers first self._transport.clear_headers() for k, v in self._headers.items(): self._transport.set_header(k, v) self._transport.add_header("X-Info", 'RPC Processor (C) Red Hat, Inc (version %s)' % self.rpc_version) # identify the capability set of this client to the server self._transport.set_header("X-Client-Version", 1) if self._allow_redirect: # Advertise that we follow redirects #changing the version from 1 to 2 to support backward compatibility self._transport.add_header("X-RHN-Transport-Capability", "follow-redirects=3") if redirect_response: self._transport.add_header('X-RHN-Redirect', '0') if self.send_handler: self._transport.add_header('X-RHN-Path', self.send_handler) request = self._req_body(self._strip_characters(params), methodname) try: response = self._transport.request(self._host, \ self._handler, request, verbose=self._verbose) save_response = self._transport.response_status except xmlrpclib.ProtocolError: if self.use_handler_path: raise else: save_response = sys.exc_info()[1].errcode self._redirected = None retry += 1 if save_response == 200: # exit redirects loop and return response break elif save_response not in (301, 302): # Retry pkg fetch self.use_handler_path = 1 continue # rest of loop is run only if we are redirected (301, 302) self._redirected = self._transport.redirected() self.use_handler_path = 0 redirect_response = 1 if not self._allow_redirect: raise InvalidRedirectionError("Redirects not allowed") if self._verbose: print("%s redirected to %s" % (self._uri, self._redirected)) typ, uri = splittype(self._redirected) if typ != None: typ = typ.lower() if typ not in ("http", "https"): raise InvalidRedirectionError( "Redirected to unsupported protocol %s" % typ) # # We forbid HTTPS -> HTTP for security reasons # Note that HTTP -> HTTPS -> HTTP is allowed (because we compare # the protocol for the redirect with the original one) # if self._type == "https" and typ == "http": raise InvalidRedirectionError( "HTTPS redirected to HTTP is not supported") self._host, self._handler = splithost(uri) if not self._handler: self._handler = "/RPC2" # Create a new transport for the redirected service and # set up the parameters on the new transport del self._transport self._transport = self.default_transport(typ, self._proxy, self._username, self._password, self._timeout) self.set_progress_callback(self._progressCallback) self.set_refresh_callback(self._refreshCallback) self.set_buffer_size(self._bufferSize) self.setlang(self._lang) if self._trusted_cert_files != [] and \ hasattr(self._transport, "add_trusted_cert"): for certfile in self._trusted_cert_files: self._transport.add_trusted_cert(certfile) # Then restart the loop to try the new entry point. if isinstance(response, transports.File): # Just return the file return response # an XML-RPC encoded data structure if isinstance(response, TupleType) and len(response) == 1: response = response[0] return response def __repr__(self): return ( "<%s for %s%s>" % (self.__class__.__name__, self._host, self._handler) ) __str__ = __repr__ def __getattr__(self, name): # magic method dispatcher return _Method(self._request, name) # note: to call a remote object with an non-standard name, use # result getattr(server, "strange-python-name")(args) def set_transport_flags(self, transfer=0, encoding=0, **kwargs): if not self._transport: # Nothing to do return kwargs.update({ 'transfer' : transfer, 'encoding' : encoding, }) self._transport.set_transport_flags(**kwargs) def get_transport_flags(self): if not self._transport: # Nothing to do return {} return self._transport.get_transport_flags() def reset_transport_flags(self): # Does nothing pass # Allow user-defined additional headers. def set_header(self, name, arg): if type(arg) in [ type([]), type(()) ]: # Multivalued header self._headers[name] = [str(a) for a in arg] else: self._headers[name] = str(arg) def add_header(self, name, arg): if name in self._headers: vlist = self._headers[name] if not isinstance(vlist, ListType): vlist = [ vlist ] else: vlist = self._headers[name] = [] vlist.append(str(arg)) # Sets the i18n options def setlang(self, lang): self._lang = lang if self._transport and hasattr(self._transport, "setlang"): self._transport.setlang(lang) # Sets the CA chain to be used def use_CA_chain(self, ca_chain = None): raise NotImplementedError("This method is deprecated") def add_trusted_cert(self, certfile): self._trusted_cert_files.append(certfile) if self._transport and hasattr(self._transport, "add_trusted_cert"): self._transport.add_trusted_cert(certfile) def close(self): if self._transport: self._transport.close() self._transport = None # RHN GET server class GETServer(Server): def __init__(self, uri, transport=None, proxy=None, username=None, password=None, client_version=2, headers={}, refreshCallback=None, progressCallback=None, timeout=None): Server.__init__(self, uri, proxy=proxy, username=username, password=password, transport=transport, refreshCallback=refreshCallback, progressCallback=progressCallback, timeout=timeout) self._client_version = client_version self._headers = headers # Back up the original handler, since we mangle it self._orig_handler = self._handler # Download resumption self.set_range(offset=None, amount=None) def _req_body(self, params, methodname): if not params or len(params) < 1: raise Exception("Required parameter channel not found") # Strip the multiple / from the handler h_comps = filter(lambda x: x != '', self._orig_handler.split('/')) # Set the handler we are going to request hndl = h_comps + ["$RHN", params[0], methodname] + list(params[1:]) self._handler = '/' + '/'.join(hndl) #save the constructed handler in case of redirect self.send_handler = self._handler # Add headers #override the handler to replace /XMLRPC with pkg path if self._redirected and not self.use_handler_path: self._handler = self._new_req_body() for h, v in self._headers.items(): self._transport.set_header(h, v) if self._offset is not None: if self._offset >= 0: brange = str(self._offset) + '-' if self._amount is not None: brange = brange + str(self._offset + self._amount - 1) else: # The last bytes # amount is ignored in this case brange = '-' + str(-self._offset) self._transport.set_header('Range', "bytes=" + brange) # Flag that we allow for partial content self._transport.set_transport_flags(allow_partial_content=1) # GET requests have empty body return "" def _new_req_body(self): type, tmpuri = splittype(self._redirected) site, handler = splithost(tmpuri) return handler def set_range(self, offset=None, amount=None): if offset is not None: try: offset = int(offset) except ValueError: # Error raise RangeError("Invalid value `%s' for offset" % offset, None, sys.exc_info()[2]) if amount is not None: try: amount = int(amount) except ValueError: # Error raise RangeError("Invalid value `%s' for amount" % amount, None, sys.exc_info()[2]) if amount <= 0: raise RangeError("Invalid value `%s' for amount" % amount) self._amount = amount self._offset = offset def reset_transport_flags(self): self._transport.set_transport_flags(allow_partial_content=0) def __getattr__(self, name): # magic method dispatcher return SlicingMethod(self._request, name) def default_transport(self, type, proxy=None, username=None, password=None, timeout=None): ret = Server.default_transport(self, type, proxy=proxy, username=username, password=password, timeout=timeout) ret.set_method("GET") return ret class RangeError(Exception): pass class InvalidRedirectionError(Exception): pass def getHeaderValues(headers, name): import mimetools if not isinstance(headers, mimetools.Message): if name in headers: return [headers[name]] return [] return [x.split(':', 1)[1].strip() for x in headers.getallmatchingheaders(name)] class _Method: """ some magic to bind an XML-RPC method to an RPC server. supports "nested" methods (e.g. examples.getStateName) """ def __init__(self, send, name): self._send = send self._name = name def __getattr__(self, name): return _Method(self._send, "%s.%s" % (self._name, name)) def __call__(self, *args): return self._send(self._name, args) def __repr__(self): return ( "<%s %s (%s)>" % (self.__class__.__name__, self._name, self._send) ) __str__ = __repr__ class SlicingMethod(_Method): """ A "slicing method" allows for byte range requests """ def __init__(self, send, name): _Method.__init__(self, send, name) self._offset = None def __getattr__(self, name): return SlicingMethod(self._send, "%s.%s" % (self._name, name)) def __call__(self, *args, **kwargs): self._offset = kwargs.get('offset') self._amount = kwargs.get('amount') # im_self is a pointer to self, so we can modify the class underneath try: self._send.im_self.set_range(offset=self._offset, amount=self._amount) except AttributeError: pass result = self._send(self._name, args) # Reset "sticky" transport flags try: self._send.im_self.reset_transport_flags() except AttributeError: pass return result def reportError(headers): """ Reports the error from the headers. """ errcode = 0 errmsg = "" s = "X-RHN-Fault-Code" if s in headers: errcode = int(headers[s]) s = "X-RHN-Fault-String" if s in headers: _sList = getHeaderValues(headers, s) if _sList: _s = ''.join(_sList) import base64 errmsg = "%s" % base64.decodestring(_s) return errcode, errmsg