Python SSH服务器（twisted.conch）命令过滤和端口转发

我需要创建一个SSH服务器（twisted.conch已被选择用于该作业），它将执行以下操作：

执行端口转发（附加代码不执行此操作，我执行此操作 不知道要修改什么）

在执行命令之前过滤命令（或至少在执行之前或之后记录命令）

下面附带的代码创建了一个完美的SSH和SFTP服务器，但它缺少一个主要组件—端口转发（和命令过滤，但这不如端口转发重要）

我尽可能地寻找，但找不到这两个人。。请帮帮我-这是谜题中最后的平静

#!/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()

---

因为您使用的是哪个实现，所以它实际上起作用。当我运行您的示例并使用ssh-L4321:remote.host:1234连接到它时root@localhost-p 2222然后

telnet localhost 4321

，我通过隧道连接到

remote.host 1234

。您必须更详细地说明您的问题。

命令日志可以在

dataReceived（self，data）

中完成：

---

但它不能很好地处理删除键、制表符、向上箭头、向下箭头和其他特殊字符。我想知道你最后是怎么得到命令的

我希望您的服务器不会被任何恶意方访问-因为您在这里发布了私钥供所有人查看。不幸的是，我不知道我不应该这样做，我对这个“海螺”的东西是新手-我应该删除它吗？一旦它准备好了，我会用它来代替sshd。你可以用另一双来替换它们。哦。。因为我把代码公开了，对吧？别担心，一旦准备好了，我会用新钥匙替换两把钥匙。我刚刚意识到端口转发不起作用，我真的需要这个功能。谢谢

def dataReceived(self, data):  
        SSHServerTransport.dataReceived(self,data)   
        self.buf += data  
        if data == '\r':  
           cmd = self.buf  
           self.buf = ''