自己签发CA证书再签发服务器证书的场景非常简单。把根CA证书导入到浏览器后,就可以信任由这个根CA直接签发的服务器证书。
但是实际上网站使用的证书肯定都不是由根CA直接签发的,比如

像百度这种,网站使用的证书就是由二级CA颁发的证书。

本文就来演示,自签CA,由自签CA签发二级CA,最后由二级CA签发网站证书

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系统环境:

Ubuntu 18.10

OpenSSL 1.1.1  11 Sep 2018

一:创建根CA

1:依次创建如下目录

mkdir -p /opt/ca/root

mkdir /opt/ca/root/key

2:vim /opt/ca/root/openssl.cnf

[ ca ]
default_ca	= CA_default
 
[ CA_default ]
dir		    = /opt/ca/root
certs		= $dir/certs
crl_dir		= $dir/crl
database	= $dir/index.txt
new_certs_dir	= $dir/newcerts
certificate	= $dir/key/cacert.crt
serial		= $dir/serial
crlnumber	= $dir/crlnumber
crl		    = $dir/crl.pem
private_key	= $dir/key/cakey.pem
RANDFILE	= $dir/key/.rand
unique_subject	= no
 
x509_extensions	= usr_cert
copy_extensions = copy
 
name_opt 	= ca_default
cert_opt 	= ca_default
 
default_days	= 365
default_crl_days= 30
default_md	= sha256
preserve	= no
policy		= policy_ca
 
[ policy_ca ]
countryName		= supplied
stateOrProvinceName	= supplied
organizationName	= supplied
organizationalUnitName	= supplied
commonName		= supplied
emailAddress		= optional
 
[ req ]
default_bits		= 2048
default_keyfile 	= privkey.pem
distinguished_name	= req_distinguished_name
attributes		= req_attributes
x509_extensions	= v3_ca
string_mask = utf8only
utf8 = yes
prompt                  = no
 
[ req_distinguished_name ]
countryName			= CN
stateOrProvinceName		= beijing
localityName			= beijing
organizationName        = Global Google CA Inc
organizationalUnitName	= Root CA
commonName			= Global Google Root CA
 
[ usr_cert ]
basicConstraints = CA:TRUE
 
[ v3_ca ]
basicConstraints = CA:TRUE
 
[ req_attributes ]

3:创建如下目录及文件

mkdir /opt/ca/root/newcerts

touch /opt/ca/root/index.txt

touch /opt/ca/root/index.txt.attr

echo 01 > /opt/ca/root/serial

4:创建根CA私钥

openssl genrsa -out /opt/ca/root/key/cakey.pem 2048

5:创建根CA证书请求文件

openssl req -new -key /opt/ca/root/key/cakey.pem -out /opt/ca/root/key/ca.csr -config /opt/ca/root/openssl.cnf

6:自签根CA证书

openssl ca -selfsign -in /opt/ca/root/key/ca.csr -out /opt/ca/root/key/cacert.crt -config /opt/ca/root/openssl.cnf

7:查看证书信息(可选)

openssl x509 -text -in /opt/ca/root/key/cacert.crt

经过以上几个步骤,就生成了根CA的相关证书和私钥,可以用于签发其他的CA(二级CA),不可签发服务器证书

 

二:创建二级CA

1:依次创建如下目录

mkdir /opt/ca/agent

mkdir /opt/ca/agent/key

2:vim /opt/ca/agent/openssl.cnf

[ ca ]
default_ca	= CA_default
 
[ CA_default ]
dir		    = /opt/ca/agent
certs		= $dir/certs
crl_dir		= $dir/crl
database	= $dir/index.txt
new_certs_dir	= $dir/newcerts
certificate	= $dir/key/cacert.crt
serial		= $dir/serial
crlnumber	= $dir/crlnumber
crl		    = $dir/crl.pem
private_key	= $dir/key/cakey.pem
RANDFILE	= $dir/key/.rand
unique_subject	= no
 
x509_extensions	= usr_cert
copy_extensions = copy
 
name_opt 	= ca_default
cert_opt 	= ca_default
 
default_days	= 365
default_crl_days= 30
default_md	= sha256
preserve	= no
policy		= policy_ca
 
[ policy_ca ]
countryName		= supplied
stateOrProvinceName	= supplied
organizationName	= supplied
organizationalUnitName	= supplied
commonName		= supplied
emailAddress		= optional
 
[ req ]
default_bits		= 2048
default_keyfile 	= privkey.pem
distinguished_name	= req_distinguished_name
attributes		= req_attributes
x509_extensions	= v3_ca
string_mask = utf8only
utf8 = yes
prompt = no
 
[ req_distinguished_name ]
countryName			= CN
stateOrProvinceName		= Guangdong
localityName			= Guangzhou
organizationName        = Global Google CA Inc
organizationalUnitName	= Google 2019 CA
commonName			= Google 2019 CA
 
[ usr_cert ]
basicConstraints = CA:FALSE
 
[ v3_ca ]
basicConstraints        = CA:TRUE
 
[ req_attributes ]

3:创建如下目录及文件

mkdir /opt/ca/agent/newcerts

touch /opt/ca/agent/index.txt

touch /opt/ca/agent/index.txt.attr

echo 01 > /opt/ca/agent/serial

4:创建二级CA私钥

openssl genrsa -out /opt/ca/agent/key/cakey.pem 2048

5:创建二级CA证书请求文件

openssl req -new -key /opt/ca/agent/key/cakey.pem -out /opt/ca/agent/key/ca.csr -config /opt/ca/agent/openssl.cnf

6:使用根CA签发二级CA

openssl ca -in /opt/ca/agent/key/ca.csr -out /opt/ca/agent/key/cacert.crt -config /opt/ca/root/openssl.cnf

7:查看证书信息(可选)

openssl x509 -text -in /opt/ca/agent/key/cacert.crt

经过以上几个步骤,就生成了一个二级CA,这个二级CA可以签发服务器证书(不能签发其他的CA)

 

三:使用二级CA签发服务器端证书

1:mkdir /opt/ca/taobao

2:vim /opt/ca/taobao/openssl.cnf

[ req ]
prompt             = no
distinguished_name = server_distinguished_name
req_extensions     = req_ext
x509_extensions	= v3_req
attributes		= req_attributes

[ server_distinguished_name ]
commonName              = taobao2018.cn
stateOrProvinceName     = zhejiang
countryName             = CN
organizationName        = Alibaba Taobao Inc
organizationalUnitName  = Taobao IT

[ v3_req ]
basicConstraints        = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment

[ req_attributes ]

[ req_ext ]
subjectAltName      = @alternate_names

[ alternate_names ]
DNS.1        = taobao2018.cn
DNS.2        = bbs.taobao2018.cn
DNS.3        = taobao2019.cn

3:生成网站私钥

openssl genrsa -out /opt/ca/taobao/privkey.pem 2048

4:生成证书请求文件(csr文件)

openssl req -new -key /opt/ca/taobao/privkey.pem -out /opt/ca/taobao/taobao.csr -config /opt/ca/taobao/openssl.cnf

5:使用二级CA进行签发证书(这里不能用根CA签发)

openssl ca -in /opt/ca/taobao/taobao.csr -out /opt/ca/taobao/taobao.crt -config /opt/ca/agent/openssl.cnf

6:聚合证书(重要)

由于是二级CA颁发的证书,所以,服务器需要把根CA、二级CA等证书都要发送给浏览器,所以给到web服务器的证书是要一个聚合的证书

cat /opt/ca/taobao/taobao.crt /opt/ca/agent/key/cacert.crt /opt/ca/root/key/cacert.crt | tee /opt/ca/taobao/taobao_all.crt

PS:注意顺序

7:查看证书信息(可选)

openssl x509 -text -in /opt/ca/taobao/taobao_all.crt

经过以上几个步骤,就生成了由二级CA签发的证书了

 

四:配置nginx的ssl

server {
	listen       443 ssl;
	server_name  taobao2018.cn bbs.taobao2018.cn taobao2019.cn;

	ssl_certificate      /opt/ca/taobao/taobao_all.crt;
	ssl_certificate_key  /opt/ca/taobao/privkey.pem;

	ssl_session_cache    shared:SSL:1m;
	ssl_session_timeout  5m;

	ssl_ciphers  HIGH:!aNULL:!MD5;
	ssl_prefer_server_ciphers  on;

	location / {
		root   html;
		index  index.html index.htm;
	}
}

五:导入自建CA的根证书(二级CA证书无需导入)

这里以Firefox为例,打开:选项 -> 隐私与安全 -> 查看证书,在证书颁发机构里面选择导入,

选择文件 /opt/ca/root/key/cacert.crt 导入并勾选2个信任的复选框

六:配置hosts

192.168.133.134 taobao2018.cn
192.168.133.134 bbs.taobao2018.cn
192.168.133.134 taobao2019.cn

最后,使用https方式访问上面的三个url中的任意一个均可

访问之后,也可以在Firefox上查看证书

 

注意:

一:

CA和证书是有区别的,CA是用来颁发证书和签发二级CA的,且两者是互斥的。也就是说,一个CA要么是用来签发二级CA的,要么是用来签发证书的。

如何判断?

在 /opt/ca/root/openssl.cnf配置文件中,有如下配置

[ usr_cert ]
basicConstraints = CA:TRUE
 
[ v3_ca ]
basicConstraints = CA:TRUE

usr_cert下面的basicConstraints代表的是当前CA的配置,

CA:TRUE是当前CA签发的是CA(二级CA),不能签发证书,

CA:FALSE是当前CA签发的是证书,不能签发CA(二级CA)

 

v3_ca下面的basicConstraints代表的是请求的证书是CA还是证书

CA:TRUE表示当前请求的是CA(二级CA)

CA:FALSE表示当前请求的是证书

 

二:

如果是CA(二级CA),则证书请求中的commonName不需要填写域名,可以填写组织机构

如果是证书,则证书请求中的commonName需要填写域名(一般是主域名),当然了,这个主域名也要在后面的subjectAltName属性中

GitHub 加速计划 / ope / openssl
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传输层安全性/安全套接层及其加密库
最近提交(Master分支:1 个月前 )
fd39d1c8 Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/25095) 3 个月前
ae87c488 Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/25095) 3 个月前
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