次のことを行う SSH サーバーを作成する必要があります (ジョブには twisted.conch が選択されています)。
- ポート転送を実行します (添付のコードではそれが行われず、何を変更すればよいかわかりません)
- コマンドを実行する前にフィルター処理します (または、少なくとも実行前または実行後にログに記録します)。
以下に添付されたコードは、完璧な SSH および SFTP サーバーを作成しますが、1 つの主要コンポーネントが欠けています - ポート転送 (およびコマンド フィルタリングですが、ポート転送ほど重要ではありません)
可能な限り探しましたが、この 2 つを見つけることができませんでした。助けてください。これがパズルの最後の平和です。
#!/usr/bin/env python
from twisted.conch.unix import UnixSSHRealm
from twisted.cred.portal import Portal
from twisted.cred.credentials import IUsernamePassword
from twisted.cred.checkers import ICredentialsChecker
from twisted.cred.error import UnauthorizedLogin
from twisted.conch.ssh.factory import SSHFactory
from twisted.internet import reactor, defer
from twisted.conch.ssh.transport import SSHServerTransport
from twisted.conch.ssh.userauth import SSHUserAuthServer
from twisted.conch.ssh.connection import SSHConnection
from twisted.conch.ssh.keys import Key
from zope.interface import implements
from subprocess import Popen,PIPE
from crypt import crypt
publicKey = 'ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAGEArzJx8OYOnJmzf4tfBEvLi8DVPrJ3/c9k2I/Az64fxjHf9imyRJbixtQhlH9lfNjUIx+4LmrJH5QNRsFporcHDKOTwTTYLh5KmRpslkYHRivcJSkbh/C+BR3utDS555mV'
privateKey = """-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----"""
# check if username/password is valid
def checkPassword(username,password):
try:
ret=False
if username and password:
output=Popen(["grep",username,"/etc/shadow"],stdout=PIPE,stderr=PIPE).communicate()[0]
hash=""
if output:
tmp=output.split(":")
if tmp>=2:
hash=tmp[1]
del tmp
ret=crypt(password,hash)==hash
del output,hash
except Exception,e:
ret=False
return ret
# authorization methods
class XSSHAuth(object):
credentialInterfaces=IUsernamePassword,implements(ICredentialsChecker)
def requestAvatarId(self, credentials):
#print "Credentials:",credentials.username,credentials.password
if credentials.username=="root" and credentials.password and checkPassword(credentials.username,credentials.password):
# successful authorization
return defer.succeed(credentials.username)
# failed authorization
return defer.fail(UnauthorizedLogin("invalid password"))
class XSSHUserAuthServer(SSHUserAuthServer):
def _ebPassword(self, reason):
addr = self.transport.getPeer().address
if addr.host!="3.22.116.85" and addr.host!="127.0.0.1":
p1 = Popen(["iptables","-I","INPUT","-s",addr.host,"-j","DROP"], stdout=PIPE, stderr=PIPE)
p1.communicate()
print(addr.host, addr.port, self.user, self.method)
self.transport.loseConnection()
return defer.fail(UnauthorizedLogin("invalid password"))
# the transport class - we use it to log MOST OF THE ACTIONS executed thru the server
class XSSHTransport(SSHServerTransport):
ourVersionString="SSH-2.0-X"
logCommand=""
def connectionMade(self):
print "Connection made",self.getPeer()
SSHServerTransport.connectionMade(self)
#self.transport.loseConnection()
def connectionLost(self,reason):
print "Connection closed",self.getPeer()
SSHServerTransport.connectionLost(self,reason)
def dataReceived(self, data):
SSHServerTransport.dataReceived(self,data)
def dispatchMessage(self, messageNum, payload):
SSHServerTransport.dispatchMessage(self,messageNum,payload)
# start the server
class XSSHFactory(SSHFactory):
protocol=XSSHTransport
factory = XSSHFactory()
factory.publicKeys = {'ssh-rsa': Key.fromString(data=publicKey)}
factory.privateKeys = {'ssh-rsa': Key.fromString(data=privateKey)}
factory.services = {
'ssh-userauth': XSSHUserAuthServer,
'ssh-connection': SSHConnection
}
portal=Portal(UnixSSHRealm())
portal.registerChecker(XSSHAuth())
factory.portal=portal
reactor.listenTCP(22, factory)
reactor.run()