我有一个由 Sectigo（前 Comodo Positive SSL 产品）颁发的证书。状态良好，1年7个月后到期。该证书由 Sectigo RSA 域验证安全服务器 CA 颁发。 CA 链中有两个中间证书，由供应商提供：最近的 Sectigo RSA 域验证安全服务器 CA 和下一个中间的 USERTrust RSA 证书颁发机构，该证书将于 2020 年 5 月 30 日到期。
中级 USERTrust RSA 证书颁发机构的到期日期非常接近，并由受浏览器信任的 AddTrust 外部 CA 根签名。
同时，最接近我的域证书中间Sectigo RSA域验证安全服务器CA由另一个具有相同名称USERTrust RSA证书颁发机构的根签名，但这与之前提到的CA证书不同。并且这个root是被普通浏览器信任的。
我尝试通过 ssl labs.com 检查它checker https://www.ssllabs.com/ssltest/analyze.html?d=habr.com我看到今天一切都好。但我不明白未来。如果我在链中留下过期的中间体，5 月 30 日之后会发生什么？或者是否最好事先将这个中间体从链中排除？
那一天已经到来了。 2020 年 5 月 30 日，USERTrust RSA 证书颁发机构已过期，我发现现代浏览器可以正常工作，但大多数自动浏览器却不能（例如，来自 Ubuntu 18.04 LTS 控制台以及 PHP 和 Ruby 脚本的curl）。
SSL 经销商之一said https://www.gogetssl.com/news/23.html:
此前他们[门派]向大家保证不会有任何问题。然而，现实情况是一些旧服务器/设备受到影响。
这是一个荒谬的情况。我们在一年内多次向他们指出即将到期的 AddTrust RSA/ECC，每次 Sectigo 都向我们保证不会出现任何问题。
Sectigo 发行faq page https://support.sectigo.com/Com_KnowledgeDetailPage?Id=kA03l00000117LT.
就我而言，正确的链条（Sectigo DV 产品/Positive SSL）：
For RSA:
# Subject: /C=GB/ST=Greater Manchester/L=Salford/O=Sectigo Limited/CN=Sectigo RSA Domain Validation Secure Server CA
# Algo: RSA, key size: 2048
# Issuer: /C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
# Not valid before: 2018-11-02T00:00:00Z
# Not valid after: 2030-12-31T23:59:59Z
# SHA-1 Fingerprint: 33:E4:E8:08:07:20:4C:2B:61:82:A3:A1:4B:59:1A:CD:25:B5:F0:DB
# SHA-256 Fingerprint: 7F:A4:FF:68:EC:04:A9:9D:75:28:D5:08:5F:94:90:7F:4D:1D:D1:C5:38:1B:AC:DC:83:2E:D5:C9:60:21:46:76
-----BEGIN CERTIFICATE-----
MIIGEzCCA/ugAwIBAgIQfVtRJrR2uhHbdBYLvFMNpzANBgkqhkiG9w0BAQwFADCB
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00u/I5sUKUErmgQfky3xxzlIPK1aEn8=
-----END CERTIFICATE-----
# Subject: /C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
# Algo: RSA, key size: 4096
# Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=Comodo CA Limited/CN=AAA Certificate Services
# Not valid before: 2019-03-12T00:00:00Z
# Not valid after: 2028-12-31T23:59:59Z
# SHA-1 Fingerprint: D8:9E:3B:D4:3D:5D:90:9B:47:A1:89:77:AA:9D:5C:E3:6C:EE:18:4C
# SHA-256 Fingerprint: 68:B9:C7:61:21:9A:5B:1F:01:31:78:44:74:66:5D:B6:1B:BD:B1:09:E0:0F:05:CA:9F:74:24:4E:E5:F5:F5:2B
-----BEGIN CERTIFICATE-----
MIIFgTCCBGmgAwIBAgIQOXJEOvkit1HX02wQ3TE1lTANBgkqhkiG9w0BAQwFADB7
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D9kCnusSTJV882sFqV4Wg8y4Z+LoE53MW4LTTLPtW//e5XOsIzstAL81VXQJSdhJ
WBp/kjbmUZIO8yZ9HE0XvMnsQybQv0FfQKlERPSZ51eHnlAfV1SoPv10Yy+xUGUJ
5lhCLkMaTLTwJUdZ+gQek9QmRkpQgbLevni3/GcV4clXhB4PY9bpYrrWX1Uu6lzG
KAgEJTm4Diup8kyXHAc/DVL17e8vgg8CAwEAAaOB8jCB7zAfBgNVHSMEGDAWgBSg
EQojPpbxB+zirynvgqV/0DCktDAdBgNVHQ4EFgQUU3m/WqorSs9UgOHYm8Cd8rID
ZsswDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQFMAMBAf8wEQYDVR0gBAowCDAG
BgRVHSAAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9jcmwuY29tb2RvY2EuY29t
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vGp4z7h/jnZymQyd/teRCBaho1+V
-----END CERTIFICATE-----
For ECC:
# Subject: /C=GB/ST=Greater Manchester/L=Salford/O=Sectigo Limited/CN=Sectigo ECC Domain Validation Secure Server CA
# Algo: EC secp256r1, key size: 256
# Issuer: /C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust ECC Certification Authority
# Not valid before: 2018-11-02T00:00:00Z
# Not valid after: 2030-12-31T23:59:59Z
# SHA-1 Fingerprint: E8:49:90:CB:9B:F8:E3:AB:0B:CA:E8:A6:49:CB:30:FE:4D:C4:D7:67
# SHA-256 Fingerprint: 61:E9:73:75:E9:F6:DA:98:2F:F5:C1:9E:2F:94:E6:6C:4E:35:B6:83:7C:E3:B9:14:D2:24:5C:7F:5F:65:82:5F
-----BEGIN CERTIFICATE-----
MIIDqDCCAy6gAwIBAgIRAPNkTmtuAFAjfglGvXvh9R0wCgYIKoZIzj0EAwMwgYgx
CzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpOZXcgSmVyc2V5MRQwEgYDVQQHEwtKZXJz
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4ToKFbZl+/OnFFzqnvOhcjHvClECEQcKmc8fmA==
-----END CERTIFICATE-----
# Subject: /C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust ECC Certification Authority
# Algo: EC secp384r1, key size: 384
# Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=Comodo CA Limited/CN=AAA Certificate Services
# Not valid before: 2019-03-12T00:00:00Z
# Not valid after: 2028-12-31T23:59:59Z
# SHA-1 Fingerprint: CA:77:88:C3:2D:A1:E4:B7:86:3A:4F:B5:7D:00:B5:5D:DA:CB:C7:F9
# SHA-256 Fingerprint: A6:CF:64:DB:B4:C8:D5:FD:19:CE:48:89:60:68:DB:03:B5:33:A8:D1:33:6C:62:56:A8:7D:00:CB:B3:DE:F3:EA
-----BEGIN CERTIFICATE-----
MIID0zCCArugAwIBAgIQVmcdBOpPmUxvEIFHWdJ1lDANBgkqhkiG9w0BAQwFADB7
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8qn0dNW44bOwgeThpWOjzOoEeJBuv/c=
-----END CERTIFICATE-----
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