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python/pam_wechat_auth.py

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+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# @Time    : 2020-01-15
+# @Author  : lework
+# @Desc    : 使用Pam-Python实现SSH的企业微信双因素认证
+
+import sys
+import pwd
+import json
+import string
+import syslog
+import random
+import hashlib
+import httplib
+import datetime
+import platform
+
+
+def auth_log(msg):
+    """写入日志"""
+    syslog.openlog(facility=syslog.LOG_AUTH)
+    syslog.syslog("MultiFactors Authentication: " + msg)
+    syslog.closelog()
+
+
+def action_wechat(content, touser=None, toparty=None, totag=None):
+    """微信通知"""
+    host = "qyapi.weixin.qq.com"
+
+    # 企业微信设置
+    corpid = ""
+    secret = ""
+    agentid = ""
+
+    headers = {
+        'Content-Type': 'application/json'
+    }
+
+    access_token_url = '/cgi-bin/gettoken?corpid={id}&corpsecret={crt}'.format(id=corpid, crt=secret)
+
+    try:
+        httpClient = httplib.HTTPSConnection(host, timeout=10)
+        httpClient.request("GET", access_token_url, headers=headers)
+        response = httpClient.getresponse()
+        token = json.loads(response.read())['access_token']
+        httpClient.close()
+    except Exception as e:
+        auth_log('get wechat token error: %s' % e)
+        return False
+
+    send_url = '/cgi-bin/message/send?access_token={token}'.format(token=token)
+
+    data = {
+        "msgtype": 'text',
+        "agentid": agentid,
+        "text": {'content': content},
+        "safe": 0
+    }
+
+    if touser:
+        data['touser'] = touser
+    if toparty:
+        data['toparty'] = toparty
+    if toparty:
+        data['totag'] = totag
+
+    try:
+        httpClient = httplib.HTTPSConnection(host, timeout=10)
+        httpClient.request("POST", send_url, json.dumps(data), headers=headers)
+        response = httpClient.getresponse()
+        result = json.loads(response.read())
+        if result['errcode'] != 0:
+            auth_log('Failed to send verification code using WeChat: %s' % result)
+            return False
+    except Exception as e:
+        auth_log('Error sending verification code using WeChat: %s' % e)
+        return False
+    finally:
+        if httpClient:
+            httpClient.close()
+
+    auth_log('Send verification code using WeChat successfully.')
+    return True
+
+def get_user_comment(user):
+    """获取用户描述信息"""
+    try:
+        comments = pwd.getpwnam(user).pw_gecos
+    except:
+        auth_log("No local user (%s) found." % user)
+        return -1
+
+    return comments # 返回用户描述信息
+
+
+def get_hash(plain_text):
+    """获取PIN码的sha512字符串"""
+    key_hash = hashlib.sha512()
+    key_hash.update(plain_text)
+
+    return key_hash.digest()
+
+
+def gen_key(pamh, user, length):
+    """生成PIN码并发送到用户"""
+    pin = ''.join(random.choice(string.digits) for i in range(length))
+    #msg = pamh.Message(pamh.PAM_ERROR_MSG, "The pin is: (%s)" % (pin))  # 登陆界面输出验证码，测试目的，实际使用中注释掉即可
+    #pamh.conversation(msg)
+
+    hostname = platform.node().split('.')[0]
+    content = "[MFA] %s 使用 %s 正在登录 %s, 验证码为【%s】, 1分钟内有效。" % (pamh.rhost, user, hostname, pin)
+    touser = get_user_comment(user) 
+    result = action_wechat(content, touser=touser)
+
+    pin_time = datetime.datetime.now()
+    return get_hash(pin), pin_time
+
+
+def pam_sm_authenticate(pamh, flags, argv):
+    PIN_LENGTH = 6  # PIN码长度
+    PIN_LIVE = 60  # PIN存活时间,超出时间验证失败
+
+    try:
+        user = pamh.get_user()
+    except pamh.exception as e:
+        return e.pam_result
+  
+    auth_log("login_ip: %s, login_user: %s" % (pamh.rhost, user))
+
+    pin, pin_time = gen_key(pamh, user, PIN_LENGTH)
+
+    for attempt in range(0, 3):  # 仅允许三次错误尝试
+        msg = pamh.Message(pamh.PAM_PROMPT_ECHO_OFF, "Verification code:")
+        resp = pamh.conversation(msg)
+        resp_time = datetime.datetime.now()
+        input_interval = resp_time - pin_time
+        if input_interval.seconds > PIN_LIVE:
+            msg = pamh.Message(pamh.PAM_ERROR_MSG, "Time limit exceeded.")
+            pamh.conversation(msg)
+            return pamh.PAM_ABORT
+        if get_hash(resp.resp) == pin:  # 用户输入与生成的验证码进行校验
+            return pamh.PAM_SUCCESS
+        else:
+            continue
+
+    msg = pamh.Message(pamh.PAM_ERROR_MSG, "Too many authentication failures.")
+    pamh.conversation(msg)
+    return pamh.PAM_AUTH_ERR
+
+
+def pam_sm_setcred(pamh, flags, argv):
+    return pamh.PAM_SUCCESS
+
+
+def pam_sm_acct_mgmt(pamh, flags, argv):
+    return pamh.PAM_SUCCESS
+
+
+def pam_sm_open_session(pamh, flags, argv):
+    return pamh.PAM_SUCCESS
+
+
+def pam_sm_close_session(pamh, flags, argv):
+    return pamh.PAM_SUCCESS
+
+def pam_sm_chauthtok(pamh, flags, argv):
+    return pamh.PAM_SUCCESS