1. 创建环境
环境：Centos7
OpenSSL 的配置文件：/etc/pki/tls/openssl.cnf
[ ca ]
default_ca = CA_default # The default ca section
####################################################################
[ CA_default ]
dir = /etc/pki/CA # CA相关文件的存放位置
certs = $dir/certs # 签发的证书位置
crl_dir = $dir/crl # 吊销证书存放位置
database = $dir/index.txt # 生成证书索引(index)数据库文件
#unique_subject = no # Set to 'no' to allow creation of
# several ctificates with same subject.
new_certs_dir = $dir/newcerts # default place for new certs.
certificate = $dir/cacert.pem # The CA certificate(CA公钥存放位置)
serial = $dir/serial # The current serial number(颁发证书的序列号)
crlnumber = $dir/crlnumber # the current crl number
# must be commented out to leave a V1 CRL
crl = $dir/crl.pem # The current CRL
private_key = $dir/private/cakey.pem# The private key(CA私钥)
RANDFILE = $dir/private/.rand # private random number file
x509_extensions = usr_cert # The extentions to add to the cert
# For the CA policy
[ policy_match ]
countryName = match
stateOrProvinceName = match
organizationName = match
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
# For the 'anything' policy
# At this point in time, you must list all acceptable 'object'
# types.
[ policy_anything ]
countryName = optional
stateOrProvinceName = optional
localityName = optional
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
# 上述三种模式match、supplied、optional为匹配、支持、可选
# 匹配指的是证书申请中填写的信息必须与CA中的一致，支持代表该项必须填写，可选则是可有可无2. 部署 CA 中心的相关信息
1）创建索引数据库文件index.txt与序列文件serial
[root@localhost ~]# cd /etc/pki/CA
[root@localhost CA]# ls
certs crl newcerts private
[root@localhost CA]# touch index.txt # 生成证书索引数据库文件
[root@localhost CA]# echo 01 > serial # 指定第一个证书的序列号，01位十六进制
[root@localhost CA]# ls
certs crl index.txt newcerts private serial
[root@localhost CA]# cat serial
012）创建CA 中心的私钥
此处的umask用于生成新文档的默认属性
A umask of 077 is good for a completely private system. No other user can read or write your data if umask is set to 077.
[root@localhost CA]# (umask 077;openssl genrsa -out /etc/pki/CA/private/cakey.pem 4096)
Generating RSA private key, 4096 bit long modulus
.........................................................................................................................................................................................................................................................................................++
.........................++
e is 65537 (0x10001)
[root@localhost CA]# ls
certs crl index.txt newcerts private serial
[root@localhost CA]# cd private
[root@localhost private]# ls
cakey.pem
[root@localhost private]# ll
总用量 4
-rw------- 1 root root 3243 4月 11 19:49 cakey.pem # 可以看到 只有owner有rw两个权限3）生成CA 的自签证书
请注意证书信息的正确填写
[root@localhost private]# openssl req -new -x509 -key /etc/pki/CA/private/cakey.pem -out /etc/pki/CA/cacert.pem -days 3650 # 通过CA私钥为CA生成x509标准的自签证书，有效期为3650天
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:Beijing
Locality Name (eg, city) [Default City]:Beijing
Organization Name (eg, company) [Default Company Ltd]:Your Company Name
Organizational Unit Name (eg, section) []:Your Unit Name
Common Name (eg, your name or your server's hostname) []:Your hostname
Email Address []:camaster@admin.com
[root@localhost CA]# ls
cacert.pem certs crl index.txt newcerts private serial4）查看 CA 中心的自签名证书
我们会看到如下格式的自签名证书：
[root@localhost CA]# openssl x509 -in /etc/pki/CA/cacert.pem -noout -text
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
c8:f6:2b:4f:e8:5f:bd:7c
Signature Algorithm: sha256WithRSAEncryption
Issuer: C=CN, ST=Beijing, L=Beijing, O=Your Company Name, OU=Your Unit Name, CN=Your Hostname/emailAddress=camaster@admin.com
Validity
Not Before: Apr 12 03:08:14 2019 GMT
Not After : Apr 9 03:08:14 2029 GMT
Subject: C=CN, ST=Beijing, L=Beijing, O=Your Company Name, OU=Your Unit Name, CN=Your Hostname/emailAddress=camaster@admin.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (4096 bit)
Modulus:
00:9d:4b:5c:34:a6:e2:7f:c9:dc:c3:7e:6a:bb:c7:
e0:fc:d5:e0:fa:fe:7d:85:50:d0:2c:c4:a2:6c:f9:
6a:66:d0:0a:9b:46:39:47:3a:93:b1:c2:5e:51:3f:
17:36:5d:16:7d:a8:19:d9:f6:69:e5:75:84:03:ac:
aa:d3:e4:b7:b5:bf:6f:b2:1c:29:c5:94:01:97:40:
c9:52:fa:5a:5f:11:77:f9:db:aa:dd:15:32:8a:37:
77:8a:40:10:87:f4:72:31:67:1b:87:86:47:22:99:
76:a1:0c:06:be:a8:9f:49:e1:54:4b:84:98:a5:63:
85:6a:a2:dd:82:23:4e:56:5e:2f:06:b5:b2:03:42:
85:91:b0:d0:93:d9:5e:30:05:84:f5:11:8e:e5:97:
21:08:bf:4c:47:db:83:07:6f:b9:89:c5:93:05:1f:
87:eb:33:84:68:23:6e:11:66:b0:a1:03:56:f4:11:
80:5b:4e:ff:d9:bb:56:1b:88:ca:bc:d3:d1:47:9e:
ab:6d:36:45:5c:ac:04:6f:25:2f:e2:c1:08:40:09:
33:fe:08:10:ce:c3:1e:04:8e:3e:6d:49:28:00:92:
00:f0:59:71:11:9f:8c:3b:4c:9b:2d:5a:d2:00:7c:
4d:9a:54:89:c0:9d:24:e6:60:6e:ae:78:02:03:f1:
0d:33:e4:93:ae:8c:dc:3a:bb:5d:18:b7:56:7b:12:
25:f5:d0:bb:0b:36:4f:08:19:59:bf:04:bc:a7:8b:
a5:81:68:54:a9:9e:27:04:a0:de:38:60:7e:16:8b:
86:94:30:f9:6a:b3:11:21:9e:a7:95:3d:2a:40:d7:
d4:d0:a7:19:db:03:6f:db:76:a6:5b:51:72:a1:24:
d5:cc:e3:c3:ca:ff:e2:d8:29:67:21:68:da:ee:af:
f8:3b:98:e0:05:10:ed:87:f4:72:f4:d9:ab:81:cc:
46:20:f8:19:bc:ac:6b:c6:de:36:a1:19:a1:fe:c3:
eb:18:36:5d:29:c0:f8:06:32:13:60:55:9c:04:ce:
2a:ce:84:aa:a9:d2:9f:8e:fd:a9:00:23:2f:3d:1a:
2e:7d:a5:79:5b:d6:bc:84:94:c6:f2:74:cc:58:c8:
8b:ef:a0:d1:90:74:98:6a:6f:5a:46:3a:62:19:05:
3d:62:68:f8:67:e0:64:b8:67:89:28:b7:aa:59:15:
bb:b5:19:b2:15:3d:d8:fb:10:dd:e3:14:23:b5:0d:
5b:8a:84:de:d7:c3:0d:9d:37:67:f3:e1:72:16:63:
ec:87:10:36:8f:5c:7b:3e:2c:41:0c:3f:46:40:67:
5f:30:f8:d4:1b:01:be:9e:f7:e9:8a:a7:52:83:fc:
9c:96:4d
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Subject Key Identifier:
99:F0:2F:E6:4E:6B:03:11:40:C7:83:2E:7E:48:AD:FB:2C:4F:85:AC
X509v3 Authority Key Identifier:
keyid:99:F0:2F:E6:4E:6B:03:11:40:C7:83:2E:7E:48:AD:FB:2C:4F:85:AC
X509v3 Basic Constraints:
CA:TRUE
Signature Algorithm: sha256WithRSAEncryption
3e:9f:e1:19:c7:f2:63:eb:bd:7f:77:4c:4c:61:50:60:91:5d:
6d:25:5c:39:7e:53:83:b2:5e:7a:56:1b:45:f3:34:6c:2c:2f:
c8:ec:58:22:23:cd:71:0e:dc:7a:17:10:0c:2c:c2:3f:e0:f1:
dd:67:02:72:36:96:c5:3c:d0:ad:84:d0:59:9b:6b:25:d3:a4:
ee:df:f9:68:b2:54:98:4e:03:2b:c3:5b:23:48:39:d3:8e:41:
4f:ca:8a:d0:ae:12:1f:56:54:d0:fe:88:57:bb:c1:db:d9:54:
e6:86:d5:62:7c:bf:4a:21:b9:4c:b3:06:8e:e8:b7:63:bb:9c:
f6:87:f2:d7:84:4e:aa:33:2a:87:d1:3e:fb:5a:b8:08:41:1d:
3a:55:6e:e7:5d:d7:d8:58:09:e5:89:30:04:b6:45:5b:33:74:
d5:8a:40:f7:07:6b:7e:64:40:2e:dc:63:65:83:fb:52:0f:51:
a8:d0:f6:6f:cd:fc:1b:6a:06:2e:3f:57:6c:2f:6f:6c:c1:ba:
d7:03:7e:95:c2:30:f1:62:bb:52:a0:cc:17:8d:e0:f6:b7:45:
5e:1b:dd:26:ef:50:cc:a7:23:2f:8b:73:ed:12:27:58:14:b3:
23:85:b9:b1:18:68:26:1a:ec:ac:41:82:88:37:d9:23:a4:0d:
4f:78:38:6f:0f:38:3c:7d:28:a4:ed:c7:a4:73:c0:b3:a6:62:
69:a1:54:31:20:f2:e0:6f:ab:23:92:d3:29:fb:c4:ac:b9:34:
d4:df:3a:d2:d0:a3:0c:ab:36:56:93:7e:37:3e:0d:f0:bb:9a:
79:7b:b8:79:ba:9a:4d:1d:4a:55:95:a2:33:1c:72:c3:c0:66:
e6:fa:19:67:60:77:56:b8:8d:ef:68:da:ae:0b:32:b8:1f:54:
87:17:20:93:c9:c4:25:63:c5:0c:65:7a:34:99:69:4a:40:46:
f8:68:e5:f6:3f:fa:5b:34:dd:44:c6:3e:9b:4d:c1:8a:6d:66:
4c:f0:c0:3f:b2:7e:31:84:56:1d:d5:d1:4e:c0:15:ed:61:f3:
e1:50:2b:51:46:b1:fd:32:a9:03:86:c2:b0:d6:aa:b5:e3:ac:
cd:10:c4:84:58:d5:88:33:cb:21:b7:5f:0a:4e:05:f7:0e:2b:
b6:77:63:d2:2f:f6:18:c3:bf:fa:3f:df:ed:52:2a:64:8f:dd:
93:70:7e:fe:6f:5b:f3:9f:c5:34:a6:1f:3e:57:53:0b:af:c4:
98:e7:8c:ed:2c:17:2b:85:2d:6f:22:23:56:d8:e6:cd:97:a6:
17:88:c1:b2:34:f6:5d:f8:77:7b:1a:ad:06:4a:83:d6:44:40:
80:0a:cf:98:d3:29:96:3c3. 部署节点的信息（私钥、证书请求 CSR）
3.1 Centos
假设现有一个服务器节点server：
1）我们首先生成服务端的私钥server.key
[root@localhost ~]# (umask 077;openssl genrsa -out /etc/pki/tls/private/server.key 2048)
Generating RSA private key, 2048 bit long modulus
.............................+++
..........................................................+++
e is 65537 (0x10001)
[root@localhost private]# ll
总用量 4
-rw------- 1 root root 1679 4月 11 20:17 server.key2）利用服务端的私钥生成证书的签署请求server.csr
注意请按照 CA 的配置文件标准，国家、省和公司名称必须与 CA 中心一致
[root@localhost private]# openssl req -new -key /etc/pki/tls/private/server.key -out /etc/pki/tls/private/server.csr -days 365
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
# 注意按照CA的配置文件标准，国家、省和公司名称必须与CA中心一致
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:Beijing
Locality Name (eg, city) [Default City]:Beijing
Organization Name (eg, company) [Default Company Ltd]:Your Company Name
Organizational Unit Name (eg, section) []:Your Unit Name
Common Name (eg, your name or your server's hostname) []:Your hostname
Email Address []:server@website.com
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
[root@localhost private]# ls
server.csr server.key- 将证书请求传给 CA
# 暂时使用scp传输证书请求
[root@localhost private]# scp /etc/pki/tls/private/server.csr [CA_IP]:/etc/pki/CA/csr/
root@[CA_IP]'s password:
server.csr 100% 1074 13.9KB/s 00:00
# 切换到CA，查看收到的server.csr文件
[root@localhost csr]# ll
总用量 4
-rw-r--r-- 1 root root 1074 4月 11 20:35 server.csr3.2 Debian(作为 SSL 连接中的 Client)
生成 Client 私钥
(umask 077;openssl genrsa -out /etc/ssl/private/client.key 2048)生成证书请求
openssl req -new -key /etc/ssl/private/client.key -out /etc/ssl/private/client.csr -days 3654. CA 签发证书
-in 代表证书请求文件，-out（根据先前 CA 配置的设定）必须放置在$dir/certs文件夹下，-days 指定日期为 365 天
[root@localhost CA]# openssl ca -in /etc/pki/CA/csr/server.csr -out /etc/pki/CA/certs/server.crt -days 365
Using configuration from /etc/pki/tls/openssl.cnf
Check that the request matches the signature
Signature ok
Certificate Details:
Serial Number: 1 (0x1)
Validity
Not Before: Apr 12 03:40:43 2019 GMT
Not After : Apr 11 03:40:43 2020 GMT
Subject:
countryName = CN
stateOrProvinceName = Beijing
organizationName = Your Company Name
organizationalUnitName = Your Unit Name
commonName = Your hostname
emailAddress = server@website.com
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
Netscape Comment:
OpenSSL Generated Certificate
X509v3 Subject Key Identifier:
15:F3:96:B0:41:AC:16:81:F2:B7:DE:B1:82:6A:74:2E:90:F5:63:8D
X509v3 Authority Key Identifier:
keyid:99:F0:2F:E6:4E:6B:03:11:40:C7:83:2E:7E:48:AD:FB:2C:4F:85:AC
Certificate is to be certified until Apr 11 03:40:43 2020 GMT (365 days)
Sign the certificate? [y/n]:y
1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated
[root@localhost CA]# tree
.
├── cacert.pem
├── certs
│ └── server.crt
├── crl
├── csr
│ └── server.csr
├── index.txt
├── index.txt.attr
├── index.txt.old
├── newcerts
│ └── 01.pem
├── private
│ └── cakey.pem
├── serial
└── serial.old
5 directories, 10 files
[root@localhost CA]# cat index.txt # 可以看到第一签署的证书编号为01,与我们在serial中设定的一致
V 200411034043Z 01 unknown /C=CN/ST=Beijing/O=Your Company Name/OU=Your Unit Name/CN=Your hostname/emailAddress=server@website.com上面结果通过
tree命令我们可以看到：1、 serial 文件发生了更新(从 01 到 02)
2、
newcerts文件夹内为 CA 刚刚签发的server服务器的证书01.pem
将签署好的证书发还给请求者
[root@localhost CA]# scp /etc/pki/CA/certs/server.crt root@[server_ip]:/etc/pki/tls/certs
root@[server_ip]'s password:
server.crt 100% 5922 75.9KB/s 00:00此时就可以在服务端查看到证书：
[root@localhost certs]# ll /etc/pki/tls/certs/
总用量 20
...
-rw-r--r-- 1 root root 5922 4月 11 20:48 server.crt
# 查看证书的序列号和主题
[root@localhost certs]# openssl x509 -in server.crt -noout -serial -subject
serial=01
subject= /C=CN/ST=Beijing/O=Your Company Name/OU=Your Unit Name/CN=Your hostname/emailAddress=server@website.com5. 吊销证书
为什么 SSL 要设置证书有效期，知乎上的这个回答很精辟。
首先是为了安全考虑，CA 机构不能保证一个网站永远是合法的，因此它需要定期检查网站。
其次，以往 CA 证书都非常贵，签发证书的机构通过设置期限来收费，是一种商业途径。
最后，还有最重要的原因就是吊销。
当网站的私钥丢失时，网站应该向证书颁发机构（CA）申请将他们的证书加入到证书吊销列表（CRL）里。当用户访问 https 站点时，浏览器会自动向 CA 请求吊销列表，如果用户访问的站点提供的证书在 CRL 里，浏览器就不信任这个证书，因为攻击者可能拥有同样的证书。所以如果证书永久有效，随着越来越多的私钥丢失，吊销列表也越来越大，因为只有加进去的，没有剔出去的，这既给 CA 增加流量压力，也会增加浏览器的流量。而一旦有效期只有几年，那么 CA 就可以将那些已经过期了的证书从 CRL 里剔除，因为反正浏览器也不信任过期证书。
目前最流行的 Let's encrypt 签发的免费 SSL 证书，有效期也设置为 90 天。
作者：Rani
链接：https://www.zhihu.com/question/20803288/answer/229784484
来源：知乎
好了，接下来我们来使用openssl吊销证书(假设 server 端私钥泄露，它向 CA 中心申请吊销证书)
先查看相关证书的 serial
openssl x509 -in server.crt -noout -serial -subject然后执行openssl ca下的的revoke操作，newcerts文件夹下保存着 CA 中心对签发证书的备份，serial替换成你要吊销的证书序列号
openssl ca -revoke /etc/pki/CA/newcerts/serial.pem
# 可以设置CRL表到期的时间
openssl ca -revoke /etc/pki/CA/newcerts/serial.pem -crldays 365
openssl ca -revoke /etc/pki/CA/newcerts/serial.pem -crlhours 365 * 24(如果是第一次执行吊销证书)，还需要生成吊销证书编号：
echo 01 > /etc/pki/CA/crlnumber
最后更新吊销证书列表(CRL list)
openssl ca -gencrl -out /etc/pki/CA/crl/CA.crl接下来我们查看 CRL 列表：
[root@localhost CA]# openssl crl -noout -text -in crl/CA.crl
Certificate Revocation List (CRL):
Version 2 (0x1)
Signature Algorithm: sha256WithRSAEncryption
Issuer: (this is your subject)
Last Update: May 21 09:24:45 2019 GMT
Next Update: Jun 20 09:24:45 2019 GMT
CRL extensions:
X509v3 CRL Number:
3
Revoked Certificates:
Serial Number: 01
Revocation Date: May 21 03:32:16 2019 GMT
Serial Number: 02
Revocation Date: May 21 03:47:37 2019 GMT
Serial Number: 03
Revocation Date: May 21 09:23:28 2019 GMT
Signature Algorithm: sha256WithRSAEncryption
4b:30:69:f2:50:13:14:e6:df:b6:3a:71:d8:8f:ed:06:06:06:
6c:c6:6a:01:07:c2:a5:e6:c8:1f:23:7e:65:0b:37:ed:f1:06:
e1:aa:86:40:a6:96:65:2f:ae:b6:2b:e8:83:4d:32:4f:09:39:
7c:9a:60:9a:bd:7c:f9:1a:9f:43:fb:04:45:51:28:5f:5b:8a:
48:b6:f7:b4:16:38:2e:70:0a:50:52:af:ac:fa:e7:3a:48:bb:
f1:bc:82:64:5e:ea:88:1c:af:34:89:65:f3:2f:47:43:68:7b:
76:39:e4:72:dc:66:5e:0e:3b:e7:a3:56:db:90:28:5d:05:54:
f1:71:bd:1c:34:e7:21:87:4d:2e:ff:01:b8:09:2c:80:d2:d2:
b5:44:3b:8d:42:ac:90:31:30:79:4f:13:78:2a:e6:3c:83:12:
31:9b:1e:55:d1:25:21:05:01:9a:5b:d6:22:9a:80:87:32:b8:
58:a1:c3:b8:d7:98:06:b1:d0:06:92:ec:8b:1a:e8:84:77:d2:
0c:13:ef:37:09:4f:93:13:50:42:1b:07:2d:d2:7f:82:02:1c:
00:5f:15:a4:06:e1:c0:fa:03:fd:9e:60:a8:66:03:07:a4:73:
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2e:5f:ad:f8:3a:01:89:af5.1 疑问：CRL 表越来越大怎么办？
这里给了很好的解答：链接
The OpenSSL
cacommand generates its CRL by looking at the index.txt file. Each line that starts with an ' R ' is added to the CRL, after which the CRL is cryptographically signed using the CA private key.
也就是说，openssl ca -gencrl是通过读取数据库文件 index.txt 生成 CRL 表的。标记为'R'的证书即为被 revoke 的，标记'V'即为 valid。
我们可以查看index.txt如下：
所以，在经过很长时间（CRL 表已经有很多 revoke 数据）后，可以在index.txt中删除已经过期的标记为'R'的证书，重新生成 CRL 表就好了，毕竟 SSL 通信的时候，过期的证书是肯定不能被信任的。
5.2 对吊销证书后 SSL 连通性的测试
我们用python来实现 SSL 连接，并测试吊销证书后的结果：
我们现在吊销了 server 端的证书，结果如下：
可以看到爆出的错误为sslv3 alert certificate revoked，表示证书已经被吊销，无法认证，并且是在do_handshake()方法中出现错误。