# echo | openssl s_client -showcerts -servername ip.sb -connect ip.sb:443 2>/dev/null
CONNECTED(00000003)
---
Certificate chain
0 s:C = US, ST = California, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
i:C = US, O = "Cloudflare, Inc.", CN = Cloudflare Inc ECC CA-3
a
KEY: id-ecPublicKey, 256 (bit); sigalg: ecdsa-with-SHA256
v:NotBefore: Jul 5 00:00:00 2022 GMT; NotAfter: Jul 5 23:59:59 2023 GMT
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
1 s:C = US, O = "Cloudflare, Inc.", CN = Cloudflare Inc ECC CA-3
i:C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
a
KEY: id-ecPublicKey, 256 (bit); sigalg: RSA-SHA256
v:NotBefore: Jan 27 12:48:08 2020 GMT; NotAfter: Dec 31 23:59:59 2024 GMT
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
---
Server certificate
subject=C = US, ST = California, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
issuer=C = US, O = "Cloudflare, Inc.", CN = Cloudflare Inc ECC CA-3
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 2606 bytes and written 391 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
Secure Renegotiation IS NOT supported
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
# echo | openssl s_client -showcerts -servername ip.sb -connect ip.sb:443 2>/dev/null| sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
参考：
https://www.baeldung.com/linux/ssl-certificates
https://stackoverflow.com/questions/7885785/using-openssl-to-get-the-certificate-from-a-server
[
本帖最后由 linda 于 2023-5-10 10:43 编辑 ]
