Merge pull request #1 from adafruit/dst-root-ca-x3

rework filter script; add DST Root CA X3 for Let's Encrypt on mbedTLS

README.md

@@ -7,20 +7,21 @@ root certificates for secure web access.
 Microsoft, Mozilla, Android, curl, and other projects maintain lists of root and related certificates.
 Those lists are quite complete, and too large for some embedded firmware.
 
-This repo includes tools to download a list of root certificates and
+This repo includes a tool to combine local or fetched root certificate lists and filter them
-subset it to the most commonly needed roots. Projects can then use
+to the most commonly needed roots.
-this repo as a submodule to have access to an updated list of root
+There is also a testing tool.
+Projects can then use this repo as a submodule to have access to an updated list of root
 certificates.
 
 Currently the certificates are filtered from the [`curl` root
 list](https://curl.se/docs/caextract.html), which is based on the
-Mozilla root list.
+Mozilla root list, and from a local file.
 
+- `tools/extra.pem` is a list of certificates needed but not present in the Mozilla root list.
 - `tools/filter_certs.py` does the filtering to the most common root cert providers.
-- `tools/issuers.txt` contains regexps to match those providers.
+- `tools/filters.txt` contains regexps to match those providers or the cert names
 - `tools/test_site_coverage.py` tests a given `roots.pem` against a long list of URL's.
 - `tools/urls.txt` is that list of URLs. Add to it as necessary. Some are commented out, for reasons noted.
 
-The resulting files are in `data/`.
+The resulting filtered root certificate bundle is in `data/`.
-- `data/roots.pem` is just a certificate bundle.
+- `data/roots.pem` contains the filtered list, with comments describing each certificate.
-- `data/roots-commented.pem` is the same bundle with a comment line describing the certificate.

data/roots.pem

@@ -1,3 +1,4 @@
+# O=GlobalSign nv-sa, CN=GlobalSign Root CA
 -----BEGIN CERTIFICATE-----
 MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG
 A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
@@ -19,6 +20,7 @@ AbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhHhm4qxFYxldBniYUr+WymXUad
 DKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveCX4XSQRjbgbME
 HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
 -----END CERTIFICATE-----
+# O=Entrust.net, CN=Entrust.net Certification Authority (2048)
 -----BEGIN CERTIFICATE-----
 MIIEKjCCAxKgAwIBAgIEOGPe+DANBgkqhkiG9w0BAQUFADCBtDEUMBIGA1UEChML
 RW50cnVzdC5uZXQxQDA+BgNVBAsUN3d3dy5lbnRydXN0Lm5ldC9DUFNfMjA0OCBp
@@ -44,6 +46,7 @@ u/8j72gZyxKTJ1wDLW8w0B62GqzeWvfRqqgnpv55gcR5mTNXuhKwqeBCbJPKVt7+
 bYQLCIt+jerXmCHG8+c8eS9enNFMFY3h7CI3zJpDC5fcgJCNs2ebb0gIFVbPv/Er
 fF6adulZkMV8gzURZVE=
 -----END CERTIFICATE-----
+# O=Baltimore, CN=Baltimore CyberTrust Root
 -----BEGIN CERTIFICATE-----
 MIIDdzCCAl+gAwIBAgIEAgAAuTANBgkqhkiG9w0BAQUFADBaMQswCQYDVQQGEwJJ
 RTESMBAGA1UEChMJQmFsdGltb3JlMRMwEQYDVQQLEwpDeWJlclRydXN0MSIwIAYD
@@ -65,6 +68,7 @@ Epn3o0WC4zxe9Z2etciefC7IpJ5OCBRLbf1wbWsaY71k5h+3zvDyny67G7fyUIhz
 ksLi4xaNmjICq44Y3ekQEe5+NauQrz4wlHrQMz2nZQ/1/I6eYs9HRCwBXbsdtTLS
 R9I4LtD+gdwyah617jzV/OeBHRnDJELqYzmp
 -----END CERTIFICATE-----
+# O=Entrust, Inc., CN=Entrust Root Certification Authority
 -----BEGIN CERTIFICATE-----
 MIIEkTCCA3mgAwIBAgIERWtQVDANBgkqhkiG9w0BAQUFADCBsDELMAkGA1UEBhMC
 VVMxFjAUBgNVBAoTDUVudHJ1c3QsIEluYy4xOTA3BgNVBAsTMHd3dy5lbnRydXN0
@@ -92,6 +96,7 @@ AGAT/3B+XxFNSRuzFVJ7yVTav52Vr2ua2J7p8eRDjeIRRDq/r72DQnNSi6q7pynP
 eu6FSqdQgPCnXEqULl8FmTxSQeDNtGPPAUO6nIPcj2A781q0tHuu2guQOHXvgR1m
 0vdXcDazv/wor3ElhVsT/h5/WrQ8
 -----END CERTIFICATE-----
+# O=Comodo CA Limited, CN=AAA Certificate Services
 -----BEGIN CERTIFICATE-----
 MIIEMjCCAxqgAwIBAgIBATANBgkqhkiG9w0BAQUFADB7MQswCQYDVQQGEwJHQjEb
 MBkGA1UECAwSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHDAdTYWxmb3JkMRow
@@ -117,6 +122,7 @@ G9w84FoVxp7Z8VlIMCFlA2zs6SFz7JsDoeA3raAVGI/6ugLOpyypEBMs1OUIJqsi
 l2D4kF501KKaU73yqWjgom7C12yxow+ev+to51byrvLjKzg6CYG1a4XXvi3tPxq3
 smPi9WIsgtRqAEFQ8TmDn5XpNpaYbg==
 -----END CERTIFICATE-----
+# O=The Go Daddy Group, Inc., CN=
 -----BEGIN CERTIFICATE-----
 MIIEADCCAuigAwIBAgIBADANBgkqhkiG9w0BAQUFADBjMQswCQYDVQQGEwJVUzEh
 MB8GA1UEChMYVGhlIEdvIERhZGR5IEdyb3VwLCBJbmMuMTEwLwYDVQQLEyhHbyBE
@@ -141,6 +147,7 @@ HmyW74cNxA9hi63ugyuV+I6ShHI56yDqg+2DzZduCLzrTia2cyvk0/ZM/iZx4mER
 dEr/VxqHD3VILs9RaRegAhJhldXRQLIQTO7ErBBDpqWeCtWVYpoNz4iCxTIM5Cuf
 ReYNnyicsbkqWletNw+vHX/bvZ8=
 -----END CERTIFICATE-----
+# O=Starfield Technologies, Inc., CN=
 -----BEGIN CERTIFICATE-----
 MIIEDzCCAvegAwIBAgIBADANBgkqhkiG9w0BAQUFADBoMQswCQYDVQQGEwJVUzEl
 MCMGA1UEChMcU3RhcmZpZWxkIFRlY2hub2xvZ2llcywgSW5jLjEyMDAGA1UECxMp
@@ -165,6 +172,7 @@ xy16paq8U4Zt3VekyvggQQto8PT7dL5WXXp59fkdheMtlb71cZBDzI0fmgAKhynp
 VSJYACPq4xJDKVtHCN2MQWplBqjlIapBtJUhlbl90TSrE9atvNziPTnNvT51cKEY
 WQPJIrSPnNVeKtelttQKbfi3QBFGmh95DmK/D5fs4C8fF5Q=
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Assured ID Root CA
 -----BEGIN CERTIFICATE-----
 MIIDtzCCAp+gAwIBAgIQDOfg5RfYRv6P5WD8G/AwOTANBgkqhkiG9w0BAQUFADBl
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -187,6 +195,7 @@ NW1fiQG2SVufAQWbqz0lwcy2f8Lxb4bG+mRo64EtlOtCt/qMHt1i8b5QZ7dsvfPx
 H2sMNgcWfzd8qVttevESRmCD1ycEvkvOl77DZypoEd+A5wwzZr8TDRRu838fYxAe
 +o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g==
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Global Root CA
 -----BEGIN CERTIFICATE-----
 MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -209,6 +218,7 @@ PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls
 YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk
 CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert High Assurance EV Root CA
 -----BEGIN CERTIFICATE-----
 MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -232,6 +242,7 @@ Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe
 vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep
 +OkuE6N36B9K
 -----END CERTIFICATE-----
+# O=COMODO CA Limited, CN=COMODO Certification Authority
 -----BEGIN CERTIFICATE-----
 MIIEHTCCAwWgAwIBAgIQToEtioJl4AsC7j41AkblPTANBgkqhkiG9w0BAQUFADCB
 gTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
@@ -257,6 +268,7 @@ zJVSk/BwJVmcIGfE7vmLV2H0knZ9P4SNVbfo5azV8fUZVqZa+5Acr5Pr5RzUZ5dd
 BA6+C4OmF4O5MBKgxTMVBbkN+8cFduPYSo38NBejxiEovjBFMR7HeL5YYTisO+IB
 ZQ==
 -----END CERTIFICATE-----
+# O=COMODO CA Limited, CN=COMODO ECC Certification Authority
 -----BEGIN CERTIFICATE-----
 MIICiTCCAg+gAwIBAgIQH0evqmIAcFBUTAGem2OZKjAKBggqhkjOPQQDAzCBhTEL
 MAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UE
@@ -273,6 +285,7 @@ BAUwAwEB/zAKBggqhkjOPQQDAwNoADBlAjEA7wNbeqy3eApyt4jf/7VGFAkK+qDm
 fQjGGoe9GKhzvSbKYAydzpmfz1wPMOG+FDHqAjAU9JM8SaczepBGR7NjfRObTrdv
 GDeAU/7dIOA1mjbRxwG55tzd8/8dLDoWV9mSOdY=
 -----END CERTIFICATE-----
+# O=GlobalSign, CN=GlobalSign
 -----BEGIN CERTIFICATE-----
 MIIDXzCCAkegAwIBAgILBAAAAAABIVhTCKIwDQYJKoZIhvcNAQELBQAwTDEgMB4G
 A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNp
@@ -294,6 +307,7 @@ mcIfeg7jLQitChws/zyrVQ4PkX4268NXSb7hLi18YIvDQVETI53O9zJrlAGomecs
 Mx86OyXShkDOOyyGeMlhLxS67ttVb9+E7gUJTb0o2HLO02JQZR7rkpeDMdmztcpH
 WD9f
 -----END CERTIFICATE-----
+# O=GoDaddy.com, Inc., CN=Go Daddy Root Certificate Authority - G2
 -----BEGIN CERTIFICATE-----
 MIIDxTCCAq2gAwIBAgIBADANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMCVVMx
 EDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxGjAYBgNVBAoT
@@ -317,6 +331,7 @@ gIOrmgIttRD02JDHBHNA7XIloKmf7J6raBKZV8aPEjoJpL1E/QYVN8Gb5DKj7Tjo
 LPAvTK33sefOT6jEm0pUBsV/fdUID+Ic/n4XuKxe9tQWskMJDE32p2u0mYRlynqI
 4uJEvlz36hz1
 -----END CERTIFICATE-----
+# O=Starfield Technologies, Inc., CN=Starfield Root Certificate Authority - G2
 -----BEGIN CERTIFICATE-----
 MIID3TCCAsWgAwIBAgIBADANBgkqhkiG9w0BAQsFADCBjzELMAkGA1UEBhMCVVMx
 EDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxJTAjBgNVBAoT
@@ -340,6 +355,7 @@ sHU48TRqneSfioYmUeYs0cYtbpUgSpIB7LiKZ3sx4mcujJUDJi5DnUox9g61DLu3
 pL/QlwVKvOoYKAKQvVR4CSFx09F9HdkWsKlhPdAKACL8x3vLCWRFCztAgfd9fDL1
 mMpYjn0q7pBZc2T5NnReJaH1ZgUufzkVqSr7UIuOhWn0
 -----END CERTIFICATE-----
+# O=Starfield Technologies, Inc., CN=Starfield Services Root Certificate Authority - G2
 -----BEGIN CERTIFICATE-----
 MIID7zCCAtegAwIBAgIBADANBgkqhkiG9w0BAQsFADCBmDELMAkGA1UEBhMCVVMx
 EDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxJTAjBgNVBAoT
@@ -364,6 +380,7 @@ iEDPfUYd/x7H4c7/I9vG+o1VTqkC50cRRj70/b17KSa7qWFiNyi2LSr2EIZkyXCn
 0q23KXB56jzaYyWf/Wi3MOxw+3WKt21gZ7IeyLnp2KhvAotnDU0mV3HaIPzBSlCN
 sSi6
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Assured ID Root G2
 -----BEGIN CERTIFICATE-----
 MIIDljCCAn6gAwIBAgIQC5McOtY5Z+pnI7/Dr5r0SzANBgkqhkiG9w0BAQsFADBl
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -386,6 +403,7 @@ B5yiutkBclzzTcHdDrEcDcRjvq30FPuJ7KJBDkzMyFdA0G4Dqs0MjomZmWzwPDCv
 ON9vvKO+KSAnq3T/EyJ43pdSVR6DtVQgA+6uwE9W3jfMw3+qBCe703e4YtsXfJwo
 IhNzbM8m9Yop5w==
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Assured ID Root G3
 -----BEGIN CERTIFICATE-----
 MIICRjCCAc2gAwIBAgIQC6Fa+h3foLVJRK/NJKBs7DAKBggqhkjOPQQDAzBlMQsw
 CQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cu
@@ -401,6 +419,7 @@ AwNnADBkAjAlpIFFAmsSS3V0T8gj43DydXLefInwz5FyYZ5eEJJZVrmDxxDnOOlY
 JjZ91eQ0hjkCMHw2U/Aw5WJjOpnitqM7mzT6HtoQknFekROn3aRukswy1vUhZscv
 6pZjamVFkpUBtA==
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Global Root G2
 -----BEGIN CERTIFICATE-----
 MIIDjjCCAnagAwIBAgIQAzrx5qcRqaC7KGSxHQn65TANBgkqhkiG9w0BAQsFADBh
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -423,6 +442,7 @@ Fdtom/DzMNU+MeKNhJ7jitralj41E6Vf8PlwUHBHQRFXGU7Aj64GxJUTFy8bJZ91
 pLiaWN0bfVKfjllDiIGknibVb63dDcY3fe0Dkhvld1927jyNxF1WW6LZZm6zNTfl
 MrY=
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Global Root G3
 -----BEGIN CERTIFICATE-----
 MIICPzCCAcWgAwIBAgIQBVVWvPJepDU1w6QP1atFcjAKBggqhkjOPQQDAzBhMQsw
 CQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cu
@@ -438,6 +458,7 @@ AK288mw/EkrRLTnDCgmXc/SINoyIJ7vmiI1Qhadj+Z4y3maTD/HMsQmP3Wyr+mt/
 oAIwOWZbwmSNuJ5Q3KjVSaLtx9zRSX8XAbjIho9OjIgrqJqpisXRAL34VOKa5Vt8
 sycX
 -----END CERTIFICATE-----
+# O=DigiCert Inc, CN=DigiCert Trusted Root G4
 -----BEGIN CERTIFICATE-----
 MIIFkDCCA3igAwIBAgIQBZsbV56OITLiOQe9p3d1XDANBgkqhkiG9w0BAQwFADBi
 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
@@ -470,6 +491,7 @@ r/OSmbaz5mEP0oUA51Aa5BuVnRmhuZyxm7EAHu/QD09CbMkKvO5D+jpxpchNJqU1
 /YldvIViHTLSoCtU7ZpXwdv6EM8Zt4tKG48BtieVU+i2iW1bvGjUI+iLUaJW+fCm
 gKDWHrO8Dw9TdSmq6hN35N6MgSGtBxBHEa2HPQfRdbzP82Z+
 -----END CERTIFICATE-----
+# O=COMODO CA Limited, CN=COMODO RSA Certification Authority
 -----BEGIN CERTIFICATE-----
 MIIF2DCCA8CgAwIBAgIQTKr5yttjb+Af907YWwOGnTANBgkqhkiG9w0BAQwFADCB
 hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
@@ -504,6 +526,7 @@ QOhTsiedSrnAdyGN/4fy3ryM7xfft0kL0fJuMAsaDk527RH89elWsn2/x20Kk4yl
 0MC2Hb46TpSi125sC8KKfPog88Tk5c0NqMuRkrF8hey1FGlmDoLnzc7ILaZRfyHB
 NVOFBkpdn627G190
 -----END CERTIFICATE-----
+# O=The USERTRUST Network, CN=USERTrust RSA Certification Authority
 -----BEGIN CERTIFICATE-----
 MIIF3jCCA8agAwIBAgIQAf1tMPyjylGoG7xkDjUDLTANBgkqhkiG9w0BAQwFADCB
 iDELMAkGA1UEBhMCVVMxEzARBgNVBAgTCk5ldyBKZXJzZXkxFDASBgNVBAcTC0pl
@@ -538,6 +561,7 @@ VXyNWQKV3WKdwrnuWih0hKWbt5DHDAff9Yk2dDLWKMGwsAvgnEzDHNb842m1R0aB
 L6KCq9NjRHDEjf8tM7qtj3u1cIiuPhnPQCjY/MiQu12ZIvVS5ljFH4gxQ+6IHdfG
 jjxDah2nGN59PRbxYvnKkKj9
 -----END CERTIFICATE-----
+# O=The USERTRUST Network, CN=USERTrust ECC Certification Authority
 -----BEGIN CERTIFICATE-----
 MIICjzCCAhWgAwIBAgIQXIuZxVqUxdJxVt7NiYDMJjAKBggqhkjOPQQDAzCBiDEL
 MAkGA1UEBhMCVVMxEzARBgNVBAgTCk5ldyBKZXJzZXkxFDASBgNVBAcTC0plcnNl
@@ -554,6 +578,7 @@ VR0TAQH/BAUwAwEB/zAKBggqhkjOPQQDAwNoADBlAjA2Z6EWCNzklwBBHU6+4WMB
 zzuqQhFkoJ2UOQIReVx7Hfpkue4WQrO/isIJxOzksU0CMQDpKmFHjFJKS04YcPbW
 RNZu9YO6bVi9JNlWSOrvxKJGgYhqOkbRqZtNyWHa0V1Xahg=
 -----END CERTIFICATE-----
+# O=GlobalSign, CN=GlobalSign
 -----BEGIN CERTIFICATE-----
 MIICHjCCAaSgAwIBAgIRYFlJ4CYuu1X5CneKcflK2GwwCgYIKoZIzj0EAwMwUDEk
 MCIGA1UECxMbR2xvYmFsU2lnbiBFQ0MgUm9vdCBDQSAtIFI1MRMwEQYDVQQKEwpH
@@ -568,6 +593,7 @@ KoZIzj0EAwMDaAAwZQIxAOVpEslu28YxuglB4Zf4+/2a4n0Sye18ZNPLBSWLVtmg
 515dTguDnFt2KaAJJiFqYgIwcdK1j1zqO+F4CYWodZI7yFz9SO8NdCKoCOJuxUnO
 xwy8p2Fp8fc74SrL+SvzZpA3
 -----END CERTIFICATE-----
+# O=IdenTrust, CN=IdenTrust Commercial Root CA 1
 -----BEGIN CERTIFICATE-----
 MIIFYDCCA0igAwIBAgIQCgFCgAAAAUUjyES1AAAAAjANBgkqhkiG9w0BAQsFADBK
 MQswCQYDVQQGEwJVUzESMBAGA1UEChMJSWRlblRydXN0MScwJQYDVQQDEx5JZGVu
@@ -599,6 +625,7 @@ l1gEIt44w8y8bckzOmoKaT+gyOpyj4xjhiO9bTyWnpXgSUyqorkqG5w2gXjtw+hG
 mUlO+KWA2yUPHGNiiskzZ2s8EIPGrd6ozRaOjfAHN3Gf8qv8QfXBi+wAN10J5U6A
 7/qxXDgGpRtK4dw4LTzcqx+QGtVKnO7RcGzM7vRX+Bi6hG6H
 -----END CERTIFICATE-----
+# O=IdenTrust, CN=IdenTrust Public Sector Root CA 1
 -----BEGIN CERTIFICATE-----
 MIIFZjCCA06gAwIBAgIQCgFCgAAAAUUjz0Z8AAAAAjANBgkqhkiG9w0BAQsFADBN
 MQswCQYDVQQGEwJVUzESMBAGA1UEChMJSWRlblRydXN0MSowKAYDVQQDEyFJZGVu
@@ -630,6 +657,7 @@ tshquDDIajjDbp7hNxbqBWJMWxJH7ae0s1hWx0nzfxJoCTFx8G34Tkf71oXuxVhA
 GaQdp/lLQzfcaFpPz+vCZHTetBXZ9FRUGi8c15dxVJCO2SCdUyt/q4/i6jC8UDfv
 8Ue1fXwsBOxonbRJRBD0ckscZOf85muQ3Wl9af0AVqW3rLatt8o+Ae+c
 -----END CERTIFICATE-----
+# O=Entrust, Inc., CN=Entrust Root Certification Authority - G2
 -----BEGIN CERTIFICATE-----
 MIIEPjCCAyagAwIBAgIESlOMKDANBgkqhkiG9w0BAQsFADCBvjELMAkGA1UEBhMC
 VVMxFjAUBgNVBAoTDUVudHJ1c3QsIEluYy4xKDAmBgNVBAsTH1NlZSB3d3cuZW50
@@ -655,6 +683,7 @@ Rkfz6/djwUAFQKXSt/S1mja/qYh2iARVBCuch38aNzx+LaUa2NSJXsq9rD1s2G2v
 nAuknZoh8/CbCzB428Hch0P+vGOaysXCHMnHjf87ElgI5rY97HosTvuDls4MPGmH
 VHOkc8KT/1EQrBVUAdj8BbGJoX90g5pJ19xOe4pIb4tF9g==
 -----END CERTIFICATE-----
+# O=Entrust, Inc., CN=Entrust Root Certification Authority - EC1
 -----BEGIN CERTIFICATE-----
 MIIC+TCCAoCgAwIBAgINAKaLeSkAAAAAUNCR+TAKBggqhkjOPQQDAzCBvzELMAkG
 A1UEBhMCVVMxFjAUBgNVBAoTDUVudHJ1c3QsIEluYy4xKDAmBgNVBAsTH1NlZSB3
@@ -673,6 +702,7 @@ BBYEFLdj5xrdjekIplWDpOBqUEFlEUJJMAoGCCqGSM49BAMDA2cAMGQCMGF52OVC
 R98crlOZF7ZvHH3hvxGU0QOIdeSNiaSKd0bebWHvAvX7td/M/k7//qnmpwIwW5nX
 hTcGtXsI/esni0qU+eH6p44mCOh8kmhtc9hvJqwhAriZtyZBWyVgrtBIGu4G
 -----END CERTIFICATE-----
+# O=Internet Security Research Group, CN=ISRG Root X1
 -----BEGIN CERTIFICATE-----
 MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
 TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
@@ -704,6 +734,7 @@ oyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq
 mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d
 emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
 -----END CERTIFICATE-----
+# O=Amazon, CN=Amazon Root CA 1
 -----BEGIN CERTIFICATE-----
 MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF
 ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6
@@ -724,6 +755,7 @@ o/ufQJVtMVT8QtPHRh8jrdkPSHCa2XV4cdFyQzR1bldZwgJcJmApzyMZFo6IQ6XU
 5MsI+yMRQ+hDKXJioaldXgjUkK642M4UwtBV8ob2xJNDd2ZhwLnoQdeXeGADbkpy
 rqXRfboQnoZsG4q5WTP468SQvvG5
 -----END CERTIFICATE-----
+# O=Amazon, CN=Amazon Root CA 2
 -----BEGIN CERTIFICATE-----
 MIIFQTCCAymgAwIBAgITBmyf0pY1hp8KD+WGePhbJruKNzANBgkqhkiG9w0BAQwF
 ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6
@@ -755,6 +787,7 @@ n749sSmvZ6ES8lgQGVMDMBu4Gon2nL2XA46jCfMdiyHxtN/kHNGfZQIG6lzWE7OE
 9jVlpNMKVv/1F2Rs76giJUmTtt8AF9pYfl3uxRuw0dFfIRDH+fO6AgonB8Xx1sfT
 4PsJYGw=
 -----END CERTIFICATE-----
+# O=Amazon, CN=Amazon Root CA 3
 -----BEGIN CERTIFICATE-----
 MIIBtjCCAVugAwIBAgITBmyf1XSXNmY/Owua2eiedgPySjAKBggqhkjOPQQDAjA5
 MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6b24g
@@ -767,6 +800,7 @@ ttvXBp43rDCGB5Fwx5zEGbF4wDAKBggqhkjOPQQDAgNJADBGAiEA4IWSoxe3jfkr
 BqWTrBqYaGFy+uGh0PsceGCmQ5nFuMQCIQCcAu/xlJyzlvnrxir4tiz+OpAUFteM
 YyRIHN8wfdVoOw==
 -----END CERTIFICATE-----
+# O=Amazon, CN=Amazon Root CA 4
 -----BEGIN CERTIFICATE-----
 MIIB8jCCAXigAwIBAgITBmyf18G7EEwpQ+Vxe3ssyBrBDjAKBggqhkjOPQQDAzA5
 MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6b24g
@@ -780,6 +814,7 @@ MAoGCCqGSM49BAMDA2gAMGUCMDqLIfG9fhGt0O9Yli/W651+kI0rz2ZVwyzjKKlw
 CkcO8DdZEv8tmZQoTipPNU0zWgIxAOp1AE47xDqUEpHJWEadIRNyp4iciuRMStuW
 1KyLa2tJElMzrdfkviT8tQp21KW8EA==
 -----END CERTIFICATE-----
+# O=GlobalSign, CN=GlobalSign
 -----BEGIN CERTIFICATE-----
 MIIFgzCCA2ugAwIBAgIORea7A4Mzw4VlSOb/RVEwDQYJKoZIhvcNAQEMBQAwTDEg
 MB4GA1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjYxEzARBgNVBAoTCkdsb2Jh
@@ -812,6 +847,7 @@ JJUEeKgDu+6B5dpffItKoZB0JaezPkvILFa9x8jvOOJckvB595yEunQtYQEgfn7R
 8k8HWV+LLUNS60YMlOH1Zkd5d9VUWx+tJDfLRVpOoERIyNiwmcUVhAn21klJwGW4
 5hpxbqCo8YLoRT5s1gLXCmeDBVrJpBA=
 -----END CERTIFICATE-----
+# O=Entrust, Inc., CN=Entrust Root Certification Authority - G4
 -----BEGIN CERTIFICATE-----
 MIIGSzCCBDOgAwIBAgIRANm1Q3+vqTkPAAAAAFVlrVgwDQYJKoZIhvcNAQELBQAw
 gb4xCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1FbnRydXN0LCBJbmMuMSgwJgYDVQQL
@@ -848,6 +884,7 @@ IQ6SwJAfzyBfyjs4x7dtOvPmRLgOMWuIjnDrnBdSqEGULoe256YSxXXfW8AKbnuk
 5F6G+TaU33fD6Q3AOfF5u0aOq0NZJ7cguyPpVkAh7DE9ZapD8j3fcEThuk0mEDuY
 n/PIjhs4ViFqUZPTkcpG2om3PVODLAgfi49T3f+sHw==
 -----END CERTIFICATE-----
+# O=GlobalSign nv-sa, CN=GlobalSign Root R46
 -----BEGIN CERTIFICATE-----
 MIIFWjCCA0KgAwIBAgISEdK7udcjGJ5AXwqdLdDfJWfRMA0GCSqGSIb3DQEBDAUA
 MEYxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMRwwGgYD
@@ -879,6 +916,7 @@ u+YfjyW6hY0XHgL+XVAEV8/+LbzvXMAaq7afJMbfc2hIkCwU9D9SGuTSyxTDYWnP
 N3ec592kD3ZDZopD8p/7DEJ4Y9HiD2971KE9dJeFt0g5QdYg/NA6s/rob8SKunE3
 vouXsXgxT7PntgMTzlSdriVZzH81Xwj3QEUxeCp6
 -----END CERTIFICATE-----
+# O=GlobalSign nv-sa, CN=GlobalSign Root E46
 -----BEGIN CERTIFICATE-----
 MIICCzCCAZGgAwIBAgISEdK7ujNu1LzmJGjFDYQdmOhDMAoGCCqGSM49BAMDMEYx
 CzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMRwwGgYDVQQD
@@ -892,6 +930,7 @@ DgQWBBQxCpCPtsad0kRLgLWi5h+xEk8blTAKBggqhkjOPQQDAwNoADBlAjEA31SQ
 7Zvvi5QCkxeCmb6zniz2C5GMn0oUsfZkvLtoURMMA/cVi4RguYv/Uo7njLwcAjA8
 +RHUjE7AwWHCFUyqqx0LMV87HOIAl0Qx5v5zli/altP+CAezNIm8BZ/3Hobui3A=
 -----END CERTIFICATE-----
+# O=Internet Security Research Group, CN=ISRG Root X2
 -----BEGIN CERTIFICATE-----
 MIICGzCCAaGgAwIBAgIQQdKd0XLq7qeAwSxs6S+HUjAKBggqhkjOPQQDAzBPMQsw
 CQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJuZXQgU2VjdXJpdHkgUmVzZWFyY2gg
@@ -906,6 +945,7 @@ zj0EAwMDaAAwZQIwe3lORlCEwkSHRhtFcP9Ymd70/aTSVaYgLXTWNLxBo1BfASdW
 tL4ndQavEi51mI38AjEAi/V3bNTIZargCyzuFJ0nN6T5U6VR5CmD1/iQMVtCnwr1
 /q4AaOeMSQ+2b1tbFfLn
 -----END CERTIFICATE-----
+# O=GlobalSign, CN=GlobalSign
 -----BEGIN CERTIFICATE-----
 MIIB3DCCAYOgAwIBAgINAgPlfvU/k/2lCSGypjAKBggqhkjOPQQDAjBQMSQwIgYD
 VQQLExtHbG9iYWxTaWduIEVDQyBSb290IENBIC0gUjQxEzARBgNVBAoTCkdsb2Jh
@@ -918,6 +958,7 @@ HQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUVLB7rUW44kB/
 +wpu+74zyTyjhNUwCgYIKoZIzj0EAwIDRwAwRAIgIk90crlgr/HmnKAWBVBfw147
 bmF0774BxL4YSFlhgjICICadVGNA3jdgUM/I2O2dgq43mLyjj0xMqTQrbO/7lZsm
 -----END CERTIFICATE-----
+# O=Google Trust Services LLC, CN=GTS Root R1
 -----BEGIN CERTIFICATE-----
 MIIFVzCCAz+gAwIBAgINAgPlk28xsBNJiGuiFzANBgkqhkiG9w0BAQwFADBHMQsw
 CQYDVQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExMQzEU
@@ -949,6 +990,7 @@ Z6tGn6D/Qqc6f1zLXbBwHSs09dR2CQzreExZBfMzQsNhFRAbd03OIozUhfJFfbdT
 2tIMPNuzjsmhDYAPexZ3FL//2wmUspO8IFgV6dtxQ/PeEMMA3KgqlbbC1j+Qa3bb
 bP6MvPJwNQzcmRk13NfIRmPVNnGuV/u3gm3c
 -----END CERTIFICATE-----
+# O=Google Trust Services LLC, CN=GTS Root R2
 -----BEGIN CERTIFICATE-----
 MIIFVzCCAz+gAwIBAgINAgPlrsWNBCUaqxElqjANBgkqhkiG9w0BAQwFADBHMQsw
 CQYDVQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExMQzEU
@@ -980,6 +1022,7 @@ JPFI/2R80L5cFtHvma3AH/vLrrw4IgYmZNralw4/KBVEqE8AyvCazM90arQ+POuV
 7LXTWtiBmelDGDfrs7vRWGJB82bSj6p4lVQgw1oudCvV0b4YacCs1aTPObpRhANl
 6WLAYv7YTVWW4tAR+kg0Eeye7QUd5MjWHYbL
 -----END CERTIFICATE-----
+# O=Google Trust Services LLC, CN=GTS Root R3
 -----BEGIN CERTIFICATE-----
 MIICCTCCAY6gAwIBAgINAgPluILrIPglJ209ZjAKBggqhkjOPQQDAzBHMQswCQYD
 VQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExMQzEUMBIG
@@ -993,6 +1036,7 @@ BBTB8Sa6oC2uhYHP0/EqEr24Cmf9vDAKBggqhkjOPQQDAwNpADBmAjEA9uEglRR7
 VKOQFhG/hMjqb2sXnh5GmCCbn9MN2azTL818+FsuVbu/3ZL3pAzcMeGiAjEA/Jdm
 ZuVDFhOD3cffL74UOO0BzrEXGhF16b0DjyZ+hOXJYKaV11RZt+cRLInUue4X
 -----END CERTIFICATE-----
+# O=Google Trust Services LLC, CN=GTS Root R4
 -----BEGIN CERTIFICATE-----
 MIICCTCCAY6gAwIBAgINAgPlwGjvYxqccpBQUjAKBggqhkjOPQQDAzBHMQswCQYD
 VQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExMQzEUMBIG
@@ -1006,6 +1050,7 @@ BBSATNbrdP9JNqPV2Py1PsVq8JQdjDAKBggqhkjOPQQDAwNpADBmAjEA6ED/g94D
 9J+uHXqnLrmvT/aDHQ4thQEd0dlq7A/Cr8deVl5c1RxYIigL9zC2L7F8AjEA8GE8
 p/SgguMh1YQdc4acLa/KNJvxn7kjNuK8YAOdgLOaVsjh4rsUecrNIdSUtUlD
 -----END CERTIFICATE-----
+# O=DigiCert, Inc., CN=DigiCert TLS ECC P384 Root G5
 -----BEGIN CERTIFICATE-----
 MIICGTCCAZ+gAwIBAgIQCeCTZaz32ci5PhwLBCou8zAKBggqhkjOPQQDAzBOMQsw
 CQYDVQQGEwJVUzEXMBUGA1UEChMORGlnaUNlcnQsIEluYy4xJjAkBgNVBAMTHURp
@@ -1020,6 +1065,7 @@ BAMDA2gAMGUCMQCJao1H5+z8blUD2WdsJk6Dxv3J+ysTvLd6jLRl0mlpYxNjOyZQ
 LgGheQaRnUi/wr4CMEfDFXuxoJGZSZOoPHzoRgaLLPIxAJSdYsiJvRmEFOml+wG4
 DXZDjC5Ty3zfDBeWUA==
 -----END CERTIFICATE-----
+# O=DigiCert, Inc., CN=DigiCert TLS RSA4096 Root G5
 -----BEGIN CERTIFICATE-----
 MIIFZjCCA06gAwIBAgIQCPm0eKj6ftpqMzeJ3nzPijANBgkqhkiG9w0BAQwFADBN
 MQswCQYDVQQGEwJVUzEXMBUGA1UEChMORGlnaUNlcnQsIEluYy4xJTAjBgNVBAMT
@@ -1051,3 +1097,24 @@ MUc/dNAUFvohigLVigmUdy7yWSiLfFCSCmZ4OIN1xLVaqBHG5cGdZlXPU8Sv13WF
 qUITVuwhd4GTWgzqltlJyqEI8pc7bZsEGCREjnwB8twl2F6GmrE52/WRMmrRpnCK
 ovfepEWFJqgejF0pW8hL2JpqA15w8oVPbEtoL8pU9ozaMv7Da4M/OMZ+
 -----END CERTIFICATE-----
+# O=Digital Signature Trust Co., CN=DST Root CA X3
+-----BEGIN CERTIFICATE-----
+MIIDSjCCAjKgAwIBAgIQRK+wgNajJ7qJMDmGLvhAazANBgkqhkiG9w0BAQUFADA/
+MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
+DkRTVCBSb290IENBIFgzMB4XDTAwMDkzMDIxMTIxOVoXDTIxMDkzMDE0MDExNVow
+PzEkMCIGA1UEChMbRGlnaXRhbCBTaWduYXR1cmUgVHJ1c3QgQ28uMRcwFQYDVQQD
+Ew5EU1QgUm9vdCBDQSBYMzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB
+AN+v6ZdQCINXtMxiZfaQguzH0yxrMMpb7NnDfcdAwRgUi+DoM3ZJKuM/IUmTrE4O
+rz5Iy2Xu/NMhD2XSKtkyj4zl93ewEnu1lcCJo6m67XMuegwGMoOifooUMM0RoOEq
+OLl5CjH9UL2AZd+3UWODyOKIYepLYYHsUmu5ouJLGiifSKOeDNoJjj4XLh7dIN9b
+xiqKqy69cK3FCxolkHRyxXtqqzTWMIn/5WgTe1QLyNau7Fqckh49ZLOMxt+/yUFw
+7BZy1SbsOFU5Q9D8/RhcQPGX69Wam40dutolucbY38EVAjqr2m7xPi71XAicPNaD
+aeQQmxkqtilX4+U9m5/wAl0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNV
+HQ8BAf8EBAMCAQYwHQYDVR0OBBYEFMSnsaR7LHH62+FLkHX/xBVghYkQMA0GCSqG
+SIb3DQEBBQUAA4IBAQCjGiybFwBcqR7uKGY3Or+Dxz9LwwmglSBd49lZRNI+DT69
+ikugdB/OEIKcdBodfpga3csTS7MgROSR6cz8faXbauX+5v3gTt23ADq1cEmv8uXr
+AvHRAosZy5Q6XkjEGB5YGV8eAlrwDPGxrancWYaLbumR9YbK+rlmM6pZW87ipxZz
+R8srzJmwN0jP41ZL9c8PDHIyh8bwRLtTcm1D9SZImlJnt1ir/md2cXjbDaJWFBM5
+JDGFoqgCWjBH4d1QB7wCCZAA62RjYJsWvIjJEubSfZGL+T0yjWW06XyxV3bqxbYo
+Ob8VZRzI9neWagqNdwvYkQsEjgfbKbYK7p2CNTUQ
+-----END CERTIFICATE-----

tools/extra.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

tools/filter_certs.py

@@ -14,78 +14,75 @@ import re
 
 @click.command()
 @click.option(
-    "--in",
+    "--sources",
-    "in_",
+    multiple=True,
-    help=".pem filename or URL to filter",
+    help=".pem filenames or URLs to filter",
-    default="https://curl.se/ca/cacert.pem",
+    default=("https://curl.se/ca/cacert.pem", "extra.pem"),
     show_default=True,
 )
 @click.option(
     "--out",
-    "out_",
     default="roots.pem",
-    help="filtered .pem file",
+    help="filtered combined .pem file",
     type=click.File("wb"),
     show_default=True,
 )
 @click.option(
-    "--comment",
+    "--filters",
-    is_flag=True,
+    help="file of cert O and CN names to select; one regexp per line; substring match; case-insensitive; # comments OK",
-    default=False,
+    default="filters.txt",
-    help="Comment certs in output",
-    show_default=True,
-)
-@click.option(
-    "--issuers",
-    "issuers_",
-    help="file of issuers to select; one regexp per line; substring match; case-insensitive; # comments OK",
-    default="issuers.txt",
     type=click.File("r"),
     show_default=True,
 )
-def run(in_, out_, comment, issuers_):
+def run(sources, out, filters):
-    if in_.startswith("http"):
+    concatenated_pem = b""
-        input_text = requests.get(in_).content
+    for source in sources:
-    else:
+        if source.startswith("http"):
-        with open(in_, "rb") as input:
+            concatenated_pem += requests.get(source).content
-            input_text = input.read()
+        else:
+            with open(source, "rb") as input:
+                concatenated_pem += input.read()
 
-    # Read a list of regexps to substr-match against Issue names.
+    # Read a list of regexps to substr-match against Issuer O and CN names.
 
-    issuer_patterns = []
+    filter_patterns = []
-    for line in issuers_.readlines():
+    for line in filters.readlines():
         line = line.strip()
         if line.startswith("#"):
             continue
-        issuer_patterns.append(re.compile(line, flags=re.IGNORECASE))
+        filter_patterns.append(re.compile(line, flags=re.IGNORECASE))
 
     # Read in all the certs at once.
-    input_certs = cryptography.x509.load_pem_x509_certificates(input_text)
+    input_certs = cryptography.x509.load_pem_x509_certificates(concatenated_pem)
 
     # For each cert, see if its O or CN name matches against the list of filter patterns.
 
     for cert in input_certs:
-        input_issuer = cert.issuer
+        issuer = cert.issuer
-        org_name_attributes = input_issuer.get_attributes_for_oid(
+        print(issuer)
+        org_name_attributes = issuer.get_attributes_for_oid(
             NameOID.ORGANIZATION_NAME
         )
         org_name = org_name_attributes[0].value if org_name_attributes else ""
 
-        common_name_attributes = input_issuer.get_attributes_for_oid(
+        common_name_attributes = issuer.get_attributes_for_oid(NameOID.COMMON_NAME)
-            NameOID.COMMON_NAME
+        common_name = (
+            common_name_attributes[0].value if common_name_attributes else ""
         )
-        common_name = common_name_attributes[0].value if common_name_attributes else ""
 
-        match_name = org_name or common_name
+        if not any((org_name, common_name)):
-        if not match_name:
+            raise ValueError(f"no O or CN available for {issuer}")
-            raise ValueError(f"no OU or CN available for {input_issuer}")
 
-        for pattern in issuer_patterns:
+        passes_filters = False
-            if pattern.search(match_name):
+        for pattern in filter_patterns:
-                # Add a comment with the O and CN names if requested.
+            if pattern.search(org_name) or pattern.search(common_name):
-                if comment:
+                passes_filters = True
-                    out_.write(f"# O={org_name}, CN={common_name}\n".encode("ascii"))
+                break
-                out_.write(cert.public_bytes(Encoding.PEM))
+
+        if passes_filters:
+            # Add a comment with the O and CN names.
+            out.write(f"# O={org_name}, CN={common_name}\n".encode("ascii"))
+            out.write(cert.public_bytes(Encoding.PEM))
 
 
 if __name__ == "__main__":

tools/filters.txt

@@ -6,6 +6,10 @@ Comodo
 Cybertrust
 DigiCert
 Digital Signature Trust
+# Expired certificate which cross-signs a special ISRG Root X1 as supplied by servers using Let's Encrypt.
+# The normal ISRG Root X1 is not cross-signed. Needed because apparently mbedTLS does not properly handle
+# the supplied ISRG Root X1 as a trust anchor.
+DST Root CA X3
 Entrust
 GlobalSign
 Go ?Daddy

tools/urls.txt

@@ -376,6 +376,8 @@ https://shopify.com
 https://shutterstock.com
 https://si.edu
 https://sina.com.cn
+# site.api.espn and others that use Let's Encrypt needs DST Root CA X3 when used with mbedTLS.
+https://site.api.espn.com
 https://sites.google.com
 https://sky.com
 https://skype.com