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""" Implements the SSH v2 key agent protocol. This protocol is documented in the SSH source code, in the file U{PROTOCOL.agent}. Maintainer: Paul Swartz """ from __future__ import absolute_import, division import struct from twisted.conch.ssh.common import NS, getNS, getMP from twisted.conch.error import ConchError, MissingKeyStoreError from twisted.conch.ssh import keys from twisted.internet import defer, protocol from twisted.python.compat import itervalues class SSHAgentClient(protocol.Protocol): """ The client side of the SSH agent protocol. This is equivalent to ssh-add(1) and can be used with either ssh-agent(1) or the SSHAgentServer protocol, also in this package. """ def __init__(self): self.buf = b'' self.deferreds = [] def dataReceived(self, data): self.buf += data while 1: if len(self.buf) <= 4: return packLen = struct.unpack('!L', self.buf[:4])[0] if len(self.buf) < 4 + packLen: return packet, self.buf = self.buf[4:4 + packLen], self.buf[4 + packLen:] reqType = ord(packet[0:1]) d = self.deferreds.pop(0) if reqType == AGENT_FAILURE: d.errback(ConchError('agent failure')) elif reqType == AGENT_SUCCESS: d.callback(b'') else: d.callback(packet) def sendRequest(self, reqType, data): pack = struct.pack('!LB',len(data) + 1, reqType) + data self.transport.write(pack) d = defer.Deferred() self.deferreds.append(d) return d def requestIdentities(self): """ @return: A L{Deferred} which will fire with a list of all keys found in the SSH agent. The list of keys is comprised of (public key blob, comment) tuples. """ d = self.sendRequest(AGENTC_REQUEST_IDENTITIES, b'') d.addCallback(self._cbRequestIdentities) return d def _cbRequestIdentities(self, data): """ Unpack a collection of identities into a list of tuples comprised of public key blobs and comments. """ if ord(data[0:1]) != AGENT_IDENTITIES_ANSWER: raise ConchError('unexpected response: %i' % ord(data[0:1])) numKeys = struct.unpack('!L', data[1:5])[0] result = [] data = data[5:] for i in range(numKeys): blob, data = getNS(data) comment, data = getNS(data) result.append((blob, comment)) return result def addIdentity(self, blob, comment = b''): """ Add a private key blob to the agent's collection of keys. """ req = blob req += NS(comment) return self.sendRequest(AGENTC_ADD_IDENTITY, req) def signData(self, blob, data): """ Request that the agent sign the given C{data} with the private key which corresponds to the public key given by C{blob}. The private key should have been added to the agent already. @type blob: L{bytes} @type data: L{bytes} @return: A L{Deferred} which fires with a signature for given data created with the given key. """ req = NS(blob) req += NS(data) req += b'\000\000\000\000' # flags return self.sendRequest(AGENTC_SIGN_REQUEST, req).addCallback(self._cbSignData) def _cbSignData(self, data): if ord(data[0:1]) != AGENT_SIGN_RESPONSE: raise ConchError('unexpected data: %i' % ord(data[0:1])) signature = getNS(data[1:])[0] return signature def removeIdentity(self, blob): """ Remove the private key corresponding to the public key in blob from the running agent. """ req = NS(blob) return self.sendRequest(AGENTC_REMOVE_IDENTITY, req) def removeAllIdentities(self): """ Remove all keys from the running agent. """ return self.sendRequest(AGENTC_REMOVE_ALL_IDENTITIES, b'') class SSHAgentServer(protocol.Protocol): """ The server side of the SSH agent protocol. This is equivalent to ssh-agent(1) and can be used with either ssh-add(1) or the SSHAgentClient protocol, also in this package. """ def __init__(self): self.buf = b'' def dataReceived(self, data): self.buf += data while 1: if len(self.buf) <= 4: return packLen = struct.unpack('!L', self.buf[:4])[0] if len(self.buf) < 4 + packLen: return packet, self.buf = self.buf[4:4 + packLen], self.buf[4 + packLen:] reqType = ord(packet[0:1]) reqName = messages.get(reqType, None) if not reqName: self.sendResponse(AGENT_FAILURE, b'') else: f = getattr(self, 'agentc_%s' % reqName) if getattr(self.factory, 'keys', None) is None: self.sendResponse(AGENT_FAILURE, b'') raise MissingKeyStoreError() f(packet[1:]) def sendResponse(self, reqType, data): pack = struct.pack('!LB', len(data) + 1, reqType) + data self.transport.write(pack) def agentc_REQUEST_IDENTITIES(self, data): """ Return all of the identities that have been added to the server """ assert data == b'' numKeys = len(self.factory.keys) resp = [] resp.append(struct.pack('!L', numKeys)) for key, comment in itervalues(self.factory.keys): resp.append(NS(key.blob())) # yes, wrapped in an NS resp.append(NS(comment)) self.sendResponse(AGENT_IDENTITIES_ANSWER, b''.join(resp)) def agentc_SIGN_REQUEST(self, data): """ Data is a structure with a reference to an already added key object and some data that the clients wants signed with that key. If the key object wasn't loaded, return AGENT_FAILURE, else return the signature. """ blob, data = getNS(data) if blob not in self.factory.keys: return self.sendResponse(AGENT_FAILURE, b'') signData, data = getNS(data) assert data == b'\000\000\000\000' self.sendResponse(AGENT_SIGN_RESPONSE, NS(self.factory.keys[blob][0].sign(signData))) def agentc_ADD_IDENTITY(self, data): """ Adds a private key to the agent's collection of identities. On subsequent interactions, the private key can be accessed using only the corresponding public key. """ # need to pre-read the key data so we can get past it to the comment string keyType, rest = getNS(data) if keyType == b'ssh-rsa': nmp = 6 elif keyType == b'ssh-dss': nmp = 5 else: raise keys.BadKeyError('unknown blob type: %s' % keyType) rest = getMP(rest, nmp)[-1] # ignore the key data for now, we just want the comment comment, rest = getNS(rest) # the comment, tacked onto the end of the key blob k = keys.Key.fromString(data, type='private_blob') # not wrapped in NS here self.factory.keys[k.blob()] = (k, comment) self.sendResponse(AGENT_SUCCESS, b'') def agentc_REMOVE_IDENTITY(self, data): """ Remove a specific key from the agent's collection of identities. """ blob, _ = getNS(data) k = keys.Key.fromString(blob, type='blob') del self.factory.keys[k.blob()] self.sendResponse(AGENT_SUCCESS, b'') def agentc_REMOVE_ALL_IDENTITIES(self, data): """ Remove all keys from the agent's collection of identities. """ assert data == b'' self.factory.keys = {} self.sendResponse(AGENT_SUCCESS, b'') # v1 messages that we ignore because we don't keep v1 keys # open-ssh sends both v1 and v2 commands, so we have to # do no-ops for v1 commands or we'll get "bad request" errors def agentc_REQUEST_RSA_IDENTITIES(self, data): """ v1 message for listing RSA1 keys; superseded by agentc_REQUEST_IDENTITIES, which handles different key types. """ self.sendResponse(AGENT_RSA_IDENTITIES_ANSWER, struct.pack('!L', 0)) def agentc_REMOVE_RSA_IDENTITY(self, data): """ v1 message for removing RSA1 keys; superseded by agentc_REMOVE_IDENTITY, which handles different key types. """ self.sendResponse(AGENT_SUCCESS, b'') def agentc_REMOVE_ALL_RSA_IDENTITIES(self, data): """ v1 message for removing all RSA1 keys; superseded by agentc_REMOVE_ALL_IDENTITIES, which handles different key types. """ self.sendResponse(AGENT_SUCCESS, b'') AGENTC_REQUEST_RSA_IDENTITIES = 1 AGENT_RSA_IDENTITIES_ANSWER = 2 AGENT_FAILURE = 5 AGENT_SUCCESS = 6 AGENTC_REMOVE_RSA_IDENTITY = 8 AGENTC_REMOVE_ALL_RSA_IDENTITIES = 9 AGENTC_REQUEST_IDENTITIES = 11 AGENT_IDENTITIES_ANSWER = 12 AGENTC_SIGN_REQUEST = 13 AGENT_SIGN_RESPONSE = 14 AGENTC_ADD_IDENTITY = 17 AGENTC_REMOVE_IDENTITY = 18 AGENTC_REMOVE_ALL_IDENTITIES = 19 messages = {} for name, value in locals().copy().items(): if name[:7] == 'AGENTC_': messages[value] = name[7:] # doesn't handle doubles