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covard/openssl.md

Created May 18, 2022 17:28
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Openssl Server Cert handshake checker
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openssl.md

OpenSSL

how to check server cert

$ openssl s_client -connect clover.mydomain.com:443

CONNECTED(00000007)
depth=0 CN = *.mydomain.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = *.mydomain.com
verify error:num=21:unable to verify the first certificate
verify return:1
depth=0 CN = *.mydomain.com
verify return:1
---
Certificate chain
 0 s:CN = *.mydomain.com
   i:C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: May 17 00:00:00 2022 GMT; NotAfter: May 21 23:59:59 2023 GMT
 1 s:CN = *.mydomain.com
   i:C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: May 17 00:00:00 2022 GMT; NotAfter: May 21 23:59:59 2023 GMT
---
Server certificate
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