day13-paramiko源码修改

小鱼儿 2021-09-20 12:34 291阅读 0赞

## 一、paramiko下载 ##

环境准备：python3.0以上

paramiko的源码的下载地址：**[猛击这里][Link 1]**

改动的内容是在demos文件夹下，执行文件是python demos.py文件

## 二、源码修改 ##

# 2.1、支持python3.0的源码修改 #

说明：由于python3.0支持所有的socket的都是bytes类型，所以，这边需要解码一下，转成str类型

![936656-20171107194112638-744670286.png][]

# 2.2、demo.py #

import base64
    from binascii import hexlify
    import getpass
    import os
    import select
    import socket
    import sys
    import time
    import traceback
    from paramiko.py3compat import input
    
    import paramiko
    try:
        import interactive
    except ImportError:
        from . import interactive
    
    
    def agent_auth(transport, username):
        """
        Attempt to authenticate to the given transport using any of the private
        keys available from an SSH agent.
        """
        
        agent = paramiko.Agent()
        agent_keys = agent.get_keys()
        if len(agent_keys) == 0:
            return
            
        for key in agent_keys:
            print('Trying ssh-agent key %s' % hexlify(key.get_fingerprint()))
            try:
                transport.auth_publickey(username, key)
                print('... success!')
                return
            except paramiko.SSHException:
                print('... nope.')
    
    
    def manual_auth(username, hostname):
        default_auth = 'p'
        auth = input('Auth by (p)assword, (r)sa key, or (d)ss key? [%s] ' % default_auth)
        if len(auth) == 0:
            auth = default_auth
    
        if auth == 'r':
            default_path = os.path.join(os.environ['HOME'], '.ssh', 'id_rsa')
            path = input('RSA key [%s]: ' % default_path)
            if len(path) == 0:
                path = default_path
            try:
                key = paramiko.RSAKey.from_private_key_file(path)
            except paramiko.PasswordRequiredException:
                password = getpass.getpass('RSA key password: ')
                key = paramiko.RSAKey.from_private_key_file(path, password)
            t.auth_publickey(username, key)
        elif auth == 'd':
            default_path = os.path.join(os.environ['HOME'], '.ssh', 'id_dsa')
            path = input('DSS key [%s]: ' % default_path)
            if len(path) == 0:
                path = default_path
            try:
                key = paramiko.DSSKey.from_private_key_file(path)
            except paramiko.PasswordRequiredException:
                password = getpass.getpass('DSS key password: ')
                key = paramiko.DSSKey.from_private_key_file(path, password)
            t.auth_publickey(username, key)
        else:
            pw = getpass.getpass('Password for %s@%s: ' % (username, hostname))
            t.auth_password(username, pw)
    
    
    # setup logging
    paramiko.util.log_to_file('demo.log')
    
    username = ''
    if len(sys.argv) > 1:
        hostname = sys.argv[1]
        if hostname.find('@') >= 0:
            username, hostname = hostname.split('@')
    else:
        hostname = input('Hostname: ')
    if len(hostname) == 0:
        print('*** Hostname required.')
        sys.exit(1)
    port = 22
    if hostname.find(':') >= 0:
        hostname, portstr = hostname.split(':')
        port = int(portstr)
    
    # now connect
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((hostname, port))
    except Exception as e:
        print('*** Connect failed: ' + str(e))
        traceback.print_exc()  #traceback模块是追踪异常，出现异常，打印出异常出现在哪一行
        sys.exit(1)
    
    try:
        t = paramiko.Transport(sock)
        try:
            t.start_client()
        except paramiko.SSHException:
            print('*** SSH negotiation failed.')
            sys.exit(1)
    
        try:
            keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
        except IOError:
            try:
                keys = paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
            except IOError:
                print('**f* Unable to open host keys ile')
                keys = {}
    
        # check server's host key -- this is important.
        key = t.get_remote_server_key()
        if hostname not in keys:
            print('*** WARNING: Unknown host key!')
        elif key.get_name() not in keys[hostname]:
            print('*** WARNING: Unknown host key!')
        elif keys[hostname][key.get_name()] != key:
            print('*** WARNING: Host key has changed!!!')
            sys.exit(1)
        else:
            print('*** Host key OK.')
    
        # get username
        if username == '':
            default_username = getpass.getuser()  #获取当前用户
            username = input('Username [%s]: ' % default_username)
            if len(username) == 0:
                username = default_username
    
        agent_auth(t, username)
        if not t.is_authenticated():
            manual_auth(username, hostname)
        if not t.is_authenticated():
            print('*** Authentication failed. :(')
            t.close()
            sys.exit(1)
    
        chan = t.open_session()  #生成一个ssh session
        chan.get_pty()
        chan.invoke_shell()
        print('*** Here we go!\n')
        interactive.interactive_shell(chan)
        chan.close()
        t.close()
    
    except Exception as e:
        print('*** Caught exception: ' + str(e.__class__) + ': ' + str(e))
        traceback.print_exc()
        try:
            t.close()
        except:
            pass
        sys.exit(1)

# 2.3、修改interactive.py文件 #

说明：修改posix\_shell函数中的内容，来获取用户执行的命令，我们需要把这些命令放入到数据库中，以便查看，到底是谁，操作了哪些命令

import socket
    import sys
    from paramiko.py3compat import u
    
    # windows does not have termios...
    try:
        import termios  #代表的是Linux的操作系统
        import tty
        has_termios = True
    except ImportError:
        has_termios = False
    
    
    def interactive_shell(chan):
        if has_termios:
            posix_shell(chan)
        else:
            windows_shell(chan)  #windows的，暂时在这边被我删掉了
    
    
    def posix_shell(chan):
        import select
        
        oldtty = termios.tcgetattr(sys.stdin)    #终端标准输入
        try:
            tty.setraw(sys.stdin.fileno())
            tty.setcbreak(sys.stdin.fileno())
            chan.settimeout(0.0)
            cmd_list = []   #获取cmd的命令
            while True:
                r, w, e = select.select([chan, sys.stdin], [], [])
                if chan in r:
                    try:
                        x = chan.recv(1024)
                        if len(x) == 0:
                            sys.stdout.write('\r\n*** EOF\r\n')
                            break
                        sys.stdout.write(x)
                        sys.stdout.flush()
                    except socket.timeout:
                        pass
                if sys.stdin in r:
                    x = sys.stdin.read(1)
                    if len(x) == 0:
                        break
    
                    if x == '\r':   #判断x是否是空格
                        cmd_str = ''.join(cmd_list)  #拼接一个完整的命令
                        cmd_list = []   #清空列表
                        print("-->",cmd_str)
                    else:
                        cmd_list.append(x)  #加入字符到命令列表中
                    chan.send(x)
    
        finally:
            termios.tcsetattr(sys.stdin, termios.TCSADRAIN, oldtty)

## 三、总结 ##

1.  下载的paramkio只需要执行demos文件夹下的demo.py文件  
    
2.  我们修改的目的是我们通过堡垒机操作远程机器的时，需要记录在机器上执行的命令，记录到数据中，以便查阅

转载于:https://www.cnblogs.com/zhangqigao/articles/7800788.html

[Link 1]: https://github.com/paramiko/paramiko
[936656-20171107194112638-744670286.png]: /images/20210726/d716d2ce7b8c4bf4b58dbdeb6af96afc.png