检查多个远程服务器的 ssl 证书的到期日期

Question

我可以使用此 OpenSSL 命令找出 ssl 证书的到期日期：

openssl x509 -noout -in <filename> -enddate

但是，如果证书分散在不同的 Web 服务器上，您如何在所有服务器上找到所有这些证书的到期日期？

似乎有一种方法可以连接到其他主机，但我不确定如何使用此方法获取到期日期：

openssl s_client -connect host:port

Answer 1

我遇到了同样的问题并写了这个......它快速而肮脏，但应该可以工作。它将记录（并在调试时打印到屏幕上）任何尚未有效或在接下来的 90 天内到期的证书。可能包含一些错误，但请随意整理。

#!/bin/sh

DEBUG=false
warning_days=90 # Number of days to warn about soon-to-expire certs
certs_to_check='serverA.test.co.uk:443
serverB.test.co.uk:8140
serverC.test.co.uk:443'

for CERT in $certs_to_check
do
  $DEBUG && echo "Checking cert: [$CERT]"

  output=$(echo | openssl s_client -connect ${CERT} 2>/dev/null |\
  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' |\
  openssl x509 -noout -subject -dates 2>/dev/null) 

  if [ "$?" -ne 0 ]; then
    $DEBUG && echo "Error connecting to host for cert [$CERT]"
    logger -p local6.warn "Error connecting to host for cert [$CERT]"
    continue
  fi

  start_date=$(echo $output | sed 's/.*notBefore=\(.*\).*not.*/\1/g')
  end_date=$(echo $output | sed 's/.*notAfter=\(.*\)$/\1/g')

  start_epoch=$(date +%s -d "$start_date")
  end_epoch=$(date +%s -d "$end_date")

  epoch_now=$(date +%s)

  if [ "$start_epoch" -gt "$epoch_now" ]; then
    $DEBUG && echo "Certificate for [$CERT] is not yet valid"
    logger -p local6.warn "Certificate for $CERT is not yet valid"
  fi

  seconds_to_expire=$(($end_epoch - $epoch_now))
  days_to_expire=$(($seconds_to_expire / 86400))

  $DEBUG && echo "Days to expiry: ($days_to_expire)"

  warning_seconds=$((86400 * $warning_days))

  if [ "$seconds_to_expire" -lt "$warning_seconds" ]; then
    $DEBUG && echo "Cert [$CERT] is soon to expire ($seconds_to_expire seconds)"
    logger -p local6.warn "cert [$CERT] is soon to expire ($seconds_to_expire seconds)"
  fi
done

如果在 OS X 上使用，您可能会发现该date命令无法正常工作。这是由于此实用程序的 Unix 和 Linux 版本存在差异。链接的帖子有使这项工作的选项。

Answer 2

只需运行下面的命令，它将提供到期日期：

echo q | openssl s_client -connect google.com.br:443 | openssl x509 -noout -enddate

您可以将此命令用于批处理文件，以便为更多远程服务器收集此信息。

Answer 3

下面是我的脚本，作为 nagios 中的检查。它连接到特定主机，它验证证书在 -c/-w 选项设置的阈值内是否有效。它可以检查证书的 CN 是否与您期望的名称匹配。

您需要 python openssl 库，我使用 python 2.7 进行了所有测试。

让 shell 脚本多次调用它是微不足道的。该脚本返回关键/警告/正常状态的标准 nagios 退出值。

可以像这样执行对 Google 证书的简单检查。

./check_ssl_certificate -H www.google.com -p 443 -n www.google.com

Expire OK[108d] - CN OK - cn:www.google.com

check_ssl_certificate

#!/usr/bin/python

"""
Usage: check_ssl_certificate -H <host> -p <port> [-m <method>] 
                      [-c <days>] [-w <days>]
  -h show the help
  -H <HOST>    host/ip to check
  -p <port>    port number
  -m <method>  (SSLv2|SSLv3|SSLv23|TLSv1) defaults to SSLv23
  -c <days>    day threshold for critical
  -w <days>    day threshold for warning
  -n name      Check CN value is valid
"""

import getopt,sys
import __main__
from OpenSSL import SSL
import socket
import datetime

# On debian Based systems requires python-openssl

def get_options():
  "get options"

  options={'host':'',
           'port':'',
           'method':'SSLv23',
           'critical':5,
           'warning':15,
           'cn':''}

  try:
    opts, args = getopt.getopt(sys.argv[1:], "hH:p:m:c:w:n:", ['help', "host", 'port', 'method'])
  except getopt.GetoptError as err:
    # print help information and exit:
    print str(err) # will print something like "option -a not recognized"
    usage()
    sys.exit(2)
  for o, a in opts:
    if o in ("-h", "--help"):
      print __main__.__doc__
      sys.exit()
    elif o in ("-H", "--host"):
      options['host'] = a
      pass
    elif o in ("-p", "--port"):
      options['port'] = a
    elif o in ("-m", "--method"):
      options['method'] = a
    elif o == '-c':
      options['critical'] = int(a)
    elif o == '-w':
      options['warning'] = int(a)
    elif o == '-n':
      options['cn'] = a
    else:
      assert False, "unhandled option"

  if (''==options['host'] or 
      ''==options['port']):
    print __main__.__doc__
    sys.exit()

  if options['critical'] >= options['warning']:
    print "Critical must be smaller then warning"
    print __main__.__doc__
    sys.exit()

  return options

def main():
  options = get_options()

  # Initialize context
  if options['method']=='SSLv3':
    ctx = SSL.Context(SSL.SSLv3_METHOD)
  elif options['method']=='SSLv2':
    ctx = SSL.Context(SSL.SSLv2_METHOD)
  elif options['method']=='SSLv23':
    ctx = SSL.Context(SSL.SSLv23_METHOD)
  else:
    ctx = SSL.Context(SSL.TLSv1_METHOD)

  # Set up client
  sock = SSL.Connection(ctx, socket.socket(socket.AF_INET, socket.SOCK_STREAM))
  sock.connect((options['host'], int(options['port'])))
  # Send an EOF
  try:
    sock.send("\x04")
    sock.shutdown()
    peer_cert=sock.get_peer_certificate()
    sock.close()
  except SSL.Error,e:
    print e

  exit_status=0
  exit_message=[]

  cur_date = datetime.datetime.utcnow()
  cert_nbefore = datetime.datetime.strptime(peer_cert.get_notBefore(),'%Y%m%d%H%M%SZ')
  cert_nafter = datetime.datetime.strptime(peer_cert.get_notAfter(),'%Y%m%d%H%M%SZ')

  expire_days = int((cert_nafter - cur_date).days)

  if cert_nbefore > cur_date:
    if exit_status < 2: 
      exit_status = 2
    exit_message.append('C: cert is not valid')
  elif expire_days < 0:
    if exit_status < 2: 
      exit_status = 2
    exit_message.append('Expire critical (expired)')
  elif options['critical'] > expire_days:
    if exit_status < 2: 
      exit_status = 2
    exit_message.append('Expire critical')
  elif options['warning'] > expire_days:
    if exit_status < 1: 
      exit_status = 1
    exit_message.append('Expire warning')
  else:
    exit_message.append('Expire OK')

  exit_message.append('['+str(expire_days)+'d]')

  for part in peer_cert.get_subject().get_components():
    if part[0]=='CN':
      cert_cn=part[1]

  if options['cn']!='' and options['cn'].lower()!=cert_cn.lower():
    if exit_status < 2:
      exit_status = 2
    exit_message.append(' - CN mismatch')
  else:
    exit_message.append(' - CN OK')

  exit_message.append(' - cn:'+cert_cn)

  print ''.join(exit_message)
  sys.exit(exit_status)

if __name__ == "__main__":
  main()