Letsencrypt SSL 证书过期
最近 Letsencrypt 的根证书 “DST Root CA X3” 过期导致一些设备出现问题。
目前 Letencrypt 证书链有两个：
证书链1：
DST Root CA X3 (1) -> ISRG Root X1 (2) -> R3 (3) -> youside.com (4)
证书链2：
ISRG Root X1 (5) -> R3 (3) -> youside.com (4)
(1) 该证书于2021年9月30日过期。Andriod根证过期时间不检查，因此 Android 仍然信任证书。该证书于2024年签发 ISRG Root X1 (2) 中间证书。 (2) “ISRG Root X1” 中间证书。这两个证书链有两个同名证书。"(2)" 是由DST Root CA X3 (1) (3) “R3” 中间证书。同时，中间证书。 ISRG Root X1 (2) 和根证书 ISRG Root X1 (5) 签发。 (5) “ISRG Root X1” 根证书。这个证书是 ISRG （Internet Security Research Group）自己的证书。现在大多数现代人都信任它。一些设备(如 Android <7.1.1)依赖证书链1 被信任。
出了什么问题：
目前默认情况下使用 证书链1 。大多数设备工作良好。 Android <7.1.1 。但部分依赖旧版 openssl (< 1.0.2g) 因为程序DST Root CA X3 过期的证书不能信任网站。 git， apt-get 。
解决方式：
修改默认的chain
如果不需要支持旧版本 Android，可修改证书链。
acme.sh 添加 --preferred-chain "ISRG"
/root/.acme.sh/acme.sh --issue --dns dns_ali --preferred-chain "ISRG" -d <domain> certbot
certbot certonly --dns-route53 -d <domain> --preferred-chain="ISRG Root X1" 如果证书未到期且未重新签发，可以添加 --force参数。
然后更新证书。
同时兼容 旧版 openssl (< 1.0.2g) 和 Android <7.1.1
对比发现 证书链1 和 证书链2 证书文件基本一致。唯一的区别是多了一个 ISRG Root X1 (2) 证书。
证书链1 的证书文件
-----BEGIN CERTIFICATE----- youside.com (4) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- R3 (3) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- ISRG Root X1 (2) 的内容 -----END CERTIFICATE----- 证书链2 的证书文件
-----BEGIN CERTIFICATE----- youside.com (4) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- R3 (3) 的内容 -----END CERTIFICATE----- 由于添加，可以看到 ISRG Root X1 (2) 内容，导致基础 openssl (< 1.0.2g) 引导程序 DST Root CA X3 (1) 。最后，我不能网站。
而证书链2则不存在 ISRG Root X1 (2) 的内容， 基于 openssl (< 1.0.2g) 的程序被引导至 ISRG Root X1 (5) 。信任网站。
证书文件可以以下形式修改：
-----BEGIN CERTIFICATE----- youside.com (4) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- R3 (3) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- ISRG Root X1 (5) 的内容 -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- ISRG Root X1 (2) 的内容 -----END CERTIFICATE----- 完整形式
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