共计 4980 个字符，预计需要花费 13 分钟才能阅读完成。
近日有群友报告 AlphaSSL 新签的证书兼容性不佳，在用自动证书工具补齐证书链之后仍然无效。鉴于 GlobalSign 近几年搞了一大堆 intermediate CA，估摸着这回终于到 AlphaSSL 头上了。简单查了下，果然。
GlobalSign GCC R6 AlphaSSL CA 2023
2022 年底的 AlphaSSL CA - SHA256 - G2 失效，GlobalSign 给了 AlphaSSL CA - SHA256 - G4 作为新的 intermediate CA 证书，写在里面的 AIA 指向 GlobalSign Root CA (01SEP1998 – 28JAN2028, root-r1)。
AlphaSSL CA – SHA256 – G4奇怪的是 2024 年 1 月 28 日之后的 AlphaSSL CA - SHA256 - G4 不再签发证书，改由 GlobalSign GCC R6 AlphaSSL CA 2023 签发原有通道的 AlphaSSL 证书，而后者的 AIA 指向 GlobalSign Root CA - R6 (10DEC2014 – 10DEC2034, root-r6)，且为信任锚。
GlobalSign Root CA – R6显然 2024 年 1 月 28 日之后的 AlphaSSL 默认的证书链的信任锚为 2014 年的这张 GlobalSign Root CA - R6。众所周知，一个新信任锚被绝大多数操作系统和软件所接受的周期是极长的，2010 年出的新根证书 (e.g. USERTrust) 依然在很多嵌入式设备、操作系统和浏览器中不受支持。保险起见，新的根证书会找老根证书交叉签名以保证自身的良好的兼容性，GlobalSign 也不例外。因此，重建证书链，将信任锚指向为其交叉签名的较老的根证书上即可解决问题。
AlphaSSL 2023 of GlobalSign R6
查询 https://crt.sh/?caid=272222 得知 GlobalSign GCC R6 AlphaSSL CA 2023 仅有一条直接上级 CA，即 GlobalSign Root CA - R6 (https://crt.sh/?caid=18459)。
GlobalSign R6 of Root继续向上查询，得知 GlobalSign Root CA - R6 除了为信任锚外，还与 GlobalSign Root CA (01SEP1998 – 28JAN2028, root-r1) 有背书，那么解决方案呼之欲出————拼接 GlobalSign GCC R6 AlphaSSL CA 2023, GlobalSign Root CA - R6 和 GlobalSign Root CA 即可解决问题。
New chain将以下代码块附加在叶子证书（第一个 BEGIN CERTIFICATE 起到第一个 END CERTIFICATE 止）后作为证书链：
-----BEGIN CERTIFICATE-----
MIIFjDCCA3SgAwIBAgIQfx8skC6D0OO2+zvuR4tegDANBgkqhkiG9w0BAQsFADBM
MSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSNjETMBEGA1UEChMKR2xv
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BBowGDAIBgZngQwBAgEwDAYKKwYBBAGgMgoBAzANBgkqhkiG9w0BAQsFAAOCAgEA
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nE0AAp9JSHxDYsma9pi4g0Phg3BgOm2euTRzw7R0SzU=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFUTCCBDmgAwIBAgIQdR4/VknnTLv2nQAmtnyqjDANBgkqhkiG9w0BAQwFADBX
MQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEQMA4GA1UE
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/Yyyic/QoGF3yFh0sNQjOvddOsqi250J3l1ELZDxgc1Xkvp+vFAEYzTfa5MYvms2
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cm9vdC5jcmwwRwYDVR0gBEAwPjA8BgRVHSAAMDQwMgYIKwYBBQUHAgEWJmh0dHBz
Oi8vd3d3Lmdsb2JhbHNpZ24uY29tL3JlcG9zaXRvcnkvMA0GCSqGSIb3DQEBDAUA
A4IBAQDHrE3fEsZgYRw59I03e5wt03B45il4hAHmquLc33pbkGZn6r3GgoKVzvwC
aBgtl6Jp93gZD8G5UjAFLj840jWDhOP7KSX6Q7rGjOsWNFFDJJLDUKQeJpB1PTRu
HqVI15zxiCl/VCP7mbTW7X/pILaFOPO+T0Qj+TUOU37WOjk6wdeyyOFiDhKSwH2Y
VE4YlAo0R10Jo3uNnSCFBgPw7gy1xt1+ajCbnzZYpQNXFy/0Lp9h3JOClE7TGvli
FUazCjxvhHm5YWqulA51wFT2K9LRiiEWw3UJAgTTmxASitVHHLb3erkETk6SCwGv
OG1eD0qLwuSeARZmhw3xFOCvMHeQ
-----END CERTIFICATE-----即可完成证书链建构。
