域名证书文件包含两段证书

通过阿里云生成一个单域名证书的文件

一、单域名证书文件

1.1、证书内容

pem]$ cat 2048227_www.xxx.com.cn.pem 
-----BEGIN CERTIFICATE-----
MIIFmDCCBICgAwIBAgIQCEZS6MCdneB/9dgvdbLKLDANBgkqhkiG9w0BAQsFADBu
......
q9kYr+G8Ga0ILktc0/kgDeEEYCiMj0GCdKfAdEBCWsmSo9LFMqcSCr+zUSw=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIEqjCCA5KgAwIBAgIQAnmsRYvBskWr+YBTzSybsTANBgkqhkiG9w0BAQsFADBh
......
rMKWaBFLmfK/AHNF4ZihwPGOc7w6UHczBZXH5RFzJNnww+WnKuTPI0HfnVH8lg==
-----END CERTIFICATE-----

1.2、将这两段证书分别写入到文件查看

第一段证书

这段证书是Encryption Everywhere DV TLS CA - G1颁发给www.xxx.com.cn的

pem]$ openssl x509 -in 1.pem -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            ......
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, O = DigiCert Inc, OU = www.digicert.com, CN = Encryption Everywhere DV TLS CA - G1
        Validity
            Not Before: Apr 11 00:00:00 2019 GMT
            Not After : Apr 10 12:00:00 2020 GMT
        Subject: CN = www.xxx.com.cn
        Subject Public Key Info:
            ......
        X509v3 extensions:
            ......
    Signature Algorithm: sha256WithRSAEncryption
         ......

第二段证书

这段证书是DigiCert Global Root CA颁发给Encryption Everywhere DV TLS CA - G1的

pem]$ openssl x509 -in 2.pem -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            02:79:ac:45:8b:c1:b2:45:ab:f9:80:53:cd:2c:9b:b1
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root CA
        Validity
            Not Before: Nov 27 12:46:10 2017 GMT
            Not After : Nov 27 12:46:10 2027 GMT
        Subject: C = US, O = DigiCert Inc, OU = www.digicert.com, CN = Encryption Everywhere DV TLS CA - G1
        Subject Public Key Info:
             ......
        X509v3 extensions:
             ......
    Signature Algorithm: sha256WithRSAEncryption
         ......

1.3、所以

所以DigiCert Global Root CA是根CA；Encryption Everywhere DV TLS CA - G1是小弟，中级CA；中级CA给www.xxx.com.cn域名办法域名证书

二、通配域名证书文件

使用letsencrypt生成的通配证书：xxx.com *.xxx.com

2.1、证书内容

也是两段证书

-----BEGIN CERTIFICATE-----
MIIFXjCCBEagAwIBAgISAybDGjCLRsJDjUnQ1qNen2QbMA0GCSqGSIb3DQEBCwUA
......
kbCSfpYWgkJhFbHnVsP8LKn9ftgudQEKJRfEEGzLwEbw9w==
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
MIIEkjCCA3qgAwIBAgIQCgFBQgAAAVOFc2oLheynCDANBgkqhkiG9w0BAQsFADA/
......
KOqkqm57TH2H3eDJAkSnh6/DNFu0Qg==
-----END CERTIFICATE-----

2.2将这两段证书分别写入文件查看

第一段证书

Let's Encrypt Authority X3给xxx.com颁发的

[root@ubuntu ~]$ openssl x509 -in 1.pem -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            ......
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
        Validity
            Not Before: Jun 22 22:32:16 2020 GMT
            Not After : Sep 20 22:32:16 2020 GMT
        Subject: CN = xxx.com
        Subject Public Key Info:
            ......
        X509v3 extensions:
              ......
    Signature Algorithm: sha256WithRSAEncryption
         ......

第二段

DST Root CA X3给Let's Encrypt Authority X3颁发的中间CA

[root@ubuntu ~]$ openssl x509 -in 2.pem -text
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            0a:01:41:42:00:00:01:53:85:73:6a:0b:85:ec:a7:08
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: O = Digital Signature Trust Co., CN = DST Root CA X3
        Validity
            Not Before: Mar 17 16:40:46 2016 GMT
            Not After : Mar 17 16:40:46 2021 GMT
        Subject: C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
        Subject Public Key Info:
            ......
        X509v3 extensions:
            ......
    Signature Algorithm: sha256WithRSAEncryption
         ......

1.3、所以

所以DST Root CA X3是根CA，它给Let's Encrypt Authority X3颁发的中间CA，Let's Encrypt Authority X3给xxx.com颁发证书

三、所以

每个域名证书里面都要有中间CA证书证书那一段