SSL证书自签名使用及监控
前言
证书简介
信息安全越来越受重视，HTTPS已经相当普及，要让我们的HTTP接口支持HTPPS，只需要一个SSL证书就可以啦
- 全称公钥证书（Public-Key Certificate, PKC）,里面保存着归属者的基本信息，以及证书过期时间、归属者的公钥，并由认证机构（Certification Authority, CA）施加数字签名，表明，某个认证机构认定该公钥的确属于此人
- 自签名的证书，就是我们来充当 认证机构，这种证书推荐在测试开发过程中，生产环境直接上CA证书省心！
实践
证书生成
准备
-
确保有openssl库
-
创建目录
# 根证书目录 [root@centos7 ~]# mkdir -p /var/ssl/crt/root # 服务器端证书目录 [root@centos7 ~]# mkdir -p /var/ssl/crt/server
生成根证书
-
私钥，RSA对称加密，aes比des更安全，密钥长度2048
openssl genrsa -aes256 -out /var/ssl/crt/root/ca.key -passout pass:"123456" 2048 -
请求流程，包含证书信息,其中比较关键的是CN，是填你的域名，根证书不起服务可以随便写，
openssl req -new -key /var/ssl/crt/root/ca.key -out /var/ssl/crt/root/ca.csr -subj "/C=CN/ST=myprovince/L=mycity/O=myorganization/OU=mygroup/CN=www.ca.crt.com/emailAddress=my@mail.com" -passin pass:"123456" -
颁发证书，这个生成的就是可以用的证书了，注意不加v3_ca这个插件，浏览器导入不了
openssl x509 -req -sha256 -extensions v3_ca -days 3650 -in /var/ssl/crt/root/ca.csr -out /var/ssl/crt/root/ca.crt -signkey /var/ssl/crt/root/ca.key -CAcreateserial -passin pass:"123456"
生成服务端证书
有了根证书之后，我们将所有的服务端证书都从根证书签出，方便客户端用根证书统一访问
-
私钥，RSA对称加密，aes比des更安全，密钥长度2048
openssl genrsa -aes256 -out /var/ssl/crt/server/svc1-server.key -passout pass:"123456" 2048 -
请求流程，包含证书信息,其中比较关键的是CN，是填你的域名
openssl req -new -key /var/ssl/crt/server/svc1-server.key -out /var/ssl/crt/server/svc1-server.csr -subj "/C=CN/ST=myprovince/L=mycity/O=myorganization/OU=mygroup/CN=www.svc1.com/emailAddress=my@mail.com" -passin pass:"123456" -
颁发证书，这个生成的就是可以用的证书了，注意不加v3_ca这个插件，浏览器导入不了
openssl x509 -req -sha256 -extensions v3_req -days 3650 -in /var/ssl/crt/server/svc1-server.csr -out /var/ssl/crt/server/svc1-server.crt -signkey /var/ssl/crt/server/svc1-server.key -CAkey /var/ssl/crt/root/ca.key -CA /var/ssl/crt/root/ca.crt -CAcreateserial -passin pass:"123456" -
验证证书
openssl verify -CAfile /var/ssl/crt/root/ca.crt /var/ssl/crt/server/svc1-server.crt
证书使用
Unubtu为例
apt install nginx -y
配置
vi /etc/nginx/sites-available/default
# 到最后加上如下内容
server {
listen 443 ssl http2 default_server;
listen [::]:443 ssl http2 default_server;
server_name www.svc1.com;
root /usr/share/nginx/html;
ssl_certificate "/var/ssl/crt/server/svc1-server.crt";
ssl_certificate_key "/var/ssl/crt/server/svc1-server.key";
ssl_session_cache shared:SSL:1m;
ssl_session_timeout 10m;
ssl_ciphers HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers on;
include /etc/nginx/default.d/*.conf;
location / {
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
vi /etc/hosts
127.0.0.1 www.svc1.com
启动
root@CN-00013965:/# sudo service nginx restart
* Restarting nginx nginx Enter PEM pass phrase:
Enter PEM pass phrase: [ OK ]
测试
-
不用证书 失败
root@CN-00013965:/# wget https://www.svc1.com --2019-10-18 16:37:48-- https://www.svc1.com/ Resolving www.svc1.com (www.svc1.com)... 127.0.0.1 Connecting to www.svc1.com (www.svc1.com)|127.0.0.1|:443... connected. ERROR: cannot verify www.svc1.com's certificate, issued by ‘emailAddress=my@mail.com,CN=www.ca.crt.com,OU=mygroup,O=myorganization,L=mycity,ST=myprovince,C=CN’: Unable to locally verify the issuer's authority. To connect to www.svc1.com insecurely, use `--no-check-certificate'. -
用根证书访问 成功
root@CN-00013965:/# wget --ca-certificate=/var/ssl/crt/root/ca.crt https://www.svc1.com --2019-10-18 16:39:50-- https://www.svc1.com/ Resolving www.svc1.com (www.svc1.com)... 127.0.0.1 Connecting to www.svc1.com (www.svc1.com)|127.0.0.1|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 612 [text/html] Saving to: ‘index.html.1’ index.html.1 100%[===================================================================================================================>] 612 --.-KB/s in 0s 2019-10-18 16:39:50 (32.4 MB/s) - ‘index.html.1’ saved [612/612]
导入Java应用
java应用要读取服务端证书需要通过pkcs12格式的keystore文件，我们可以把不同的服务端证书用别名区分。然后我们读取trustkeystore去访问HTTPS其他服务
-
生成keystore
openssl pkcs12 -export -clcerts -in /var/ssl/crt/server/svc1-server.crt -inkey /var/ssl/crt/server/svc1-server.key -out /var/ssl/crt/server/svc1-server.p12 -name svc1 -passin pass:"123456" -password pass:"123456"keytool命令是JDK自带的到${JAVA_HOME}/bin下执行，-srcstorepass是我们证书的密码，其他两个是keystore的密码
keytool -importkeystore -trustcacerts -noprompt -deststoretype pkcs12 -srcstoretype pkcs12 -srckeystore /var/ssl/crt/server/svc1-server.p12 -destkeystore /var/ssl/crt/server/svc1-server.keystore -alias svc1 -deststorepass "123456" -destkeypass "123456" -srcstorepass "123456" -
生成trustkeystore
keytool -import -trustcacerts -noprompt -alias CA -file /var/ssl/crt/root/ca.crt -keystore /var/ssl/crt/root/ca.trustkeystore -storepass "123456"
监控
证书起到服务端口上了，我们怎么查看证书信息，或者实时检查证书过期信息呢，已默认443端口为例
root@CN-00013965:/# echo 'Q' | timeout 5 openssl s_client -connect 127.0.0.1:443 2>/dev/null | openssl x509 -noout -subject -dates
subject=C = CN, ST = myprovince, L = mycity, O = myorganization, OU = mygroup, CN = www.svc1.com, emailAddress = my@mail.com
notBefore=Oct 18 08:09:32 2019 GMT
notAfter=Oct 15 08:09:32 2029 GMT
如果在用postgresql数据库起的HTTPS，那么直接openssl不能直接拿到端口证书，我们可以借助python脚本，脚本是Github上找的
#!/usr/bin/env python
import argparse
import socket
import ssl
import struct
import subprocess
import sys
try:
from urlparse import urlparse
except ImportError:
from urllib.parse import urlparse
def main():
args = get_args()
target = get_target_address_from_args(args)
sock = socket.create_connection(target)
try:
certificate_as_pem = get_certificate_from_socket(sock)
print(certificate_as_pem.decode('utf-8'))
except Exception as exc:
sys.stderr.write('Something failed while fetching certificate: {0}\n'.format(exc))
sys.exit(1)
finally:
sock.close()
def get_args():
parser = argparse.ArgumentParser()
parser.add_argument('database', help='Either an IP address, hostname or URL with host and port')
return parser.parse_args()
def get_target_address_from_args(args):
specified_target = args.database
if '//' not in specified_target:
specified_target = '//' + specified_target
parsed = urlparse(specified_target)
return (parsed.hostname, parsed.port or 5432)
def get_certificate_from_socket(sock):
request_ssl(sock)
ssl_context = get_ssl_context()
sock = ssl_context.wrap_socket(sock)
sock.do_handshake()
certificate_as_der = sock.getpeercert(binary_form=True)
certificate_as_pem = encode_der_as_pem(certificate_as_der)
return certificate_as_pem
def request_ssl(sock):
version_ssl = postgres_protocol_version_to_binary(1234, 5679)
length = struct.pack('!I', 8)
packet = length + version_ssl
sock.sendall(packet)
data = read_n_bytes_from_socket(sock, 1)
if data != b'S':
raise Exception('Backend does not support TLS')
def get_ssl_context():
for proto in ('PROTOCOL_TLSv1_2', 'PROTOCOL_TLSv1', 'PROTOCOL_SSLv23'):
protocol = getattr(ssl, proto, None)
if protocol:
break
return ssl.SSLContext(protocol)
def encode_der_as_pem(cert):
cmd = ['openssl', 'x509', '-inform', 'DER']
pipe = subprocess.PIPE
process = subprocess.Popen(cmd, stdin=pipe, stdout=pipe, stderr=pipe)
stdout, stderr = process.communicate(cert)
if stderr:
raise Exception('OpenSSL error when converting cert to PEM: {0}'.format(stderr))
return stdout.strip()
def read_n_bytes_from_socket(sock, n):
buf = bytearray(n)
view = memoryview(buf)
while n:
nbytes = sock.recv_into(view, n)
view = view[nbytes:] # slicing views is cheap
n -= nbytes
return buf
def postgres_protocol_version_to_binary(major, minor):
return struct.pack('!I', major << 16 | minor)
if __name__ == '__main__':
main()
使用方法：复制上面脚本，文件名get_postgres_cert.py
python get_postgres_cert.py 127.0.0.1:5432
