回答編集履歴
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確認方法を追記
test
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TLS 1.2 が、サポートされたのは、OpenSSL version 1.0.1 からだと思うのですが、お使いの環境の OpenSSL のバージョンは、いくつでしょうか？
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確認方法：
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```
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openssl s_client -connect www.google.com:443 -tls1_2
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```
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対応している場合
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```
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CONNECTED(00000003)
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depth=2 OU = GlobalSign Root CA - R2, O = GlobalSign, CN = GlobalSign
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verify return:1
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depth=1 C = US, O = Google Trust Services, CN = Google Internet Authority G3
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verify return:1
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depth=0 C = US, ST = California, L = Mountain View, O = Google LLC, CN = www.google.com
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verify return:1
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---
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Certificate chain
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0 s:/C=US/ST=California/L=Mountain View/O=Google LLC/CN=www.google.com
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i:/C=US/O=Google Trust Services/CN=Google Internet Authority G3
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1 s:/C=US/O=Google Trust Services/CN=Google Internet Authority G3
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i:/OU=GlobalSign Root CA - R2/O=GlobalSign/CN=GlobalSign
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---
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Server certificate
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-----BEGIN CERTIFICATE-----
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(省略)
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-----END CERTIFICATE-----
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subject=/C=US/ST=California/L=Mountain View/O=Google LLC/CN=www.google.com
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issuer=/C=US/O=Google Trust Services/CN=Google Internet Authority G3
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---
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No client certificate CA names sent
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Peer signing digest: SHA256
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Server Temp Key: ECDH, P-256, 256 bits
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---
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SSL handshake has read 2986 bytes and written 415 bytes
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---
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New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
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Server public key is 2048 bit
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Secure Renegotiation IS supported
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Compression: NONE
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Expansion: NONE
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No ALPN negotiated
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SSL-Session:
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Protocol : TLSv1.2
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Cipher : ECDHE-RSA-AES128-GCM-SHA256
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Session-ID: 9279A0635D520A443EB6E4F8B49571E05E678212FDB4E2FEF21498BAEED9A042
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Session-ID-ctx:
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Master-Key: B0E2902118E3182E9ADEBEB731C0FF080580986DFC9F90242EA64DF5C9A37408862B28EE0AC285E17EDDE711D2006B8A
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Key-Arg : None
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Krb5 Principal: None
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PSK identity: None
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PSK identity hint: None
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TLS session ticket lifetime hint: 100800 (seconds)
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TLS session ticket:
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0000 - 00 03 c1 16 a8 05 68 cb-be 36 04 0d 94 4a 5e e1 ......h..6...J^.
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0010 - f7 94 06 7f 69 62 8c 3b-26 df 36 c1 fc 94 2a 7b ....ib.;&.6...*{
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0020 - db 52 9e 7d 5c 9a 00 99-00 c8 2d 6b eb 0d c2 1f .R.}.....-k....
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0030 - af 0d 7a 4f d3 5b 5c c2-b3 5b c7 64 52 d0 e0 2f ..zO.[..[.dR../
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0040 - 19 5e ac d9 62 db 18 11-19 af 4d 26 89 79 20 48 .^..b.....M&.y H
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0050 - 2f ae 8a 56 d7 0e 51 11-48 6c 59 26 73 48 c9 a0 /..V..Q.HlY&sH..
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0060 - 79 38 de 19 ec 0a 67 8a-40 f9 ed 16 9f 90 0b dd y8....g.@.......
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0070 - b9 3b c2 b7 26 e6 7d d2-9b d5 2b b1 53 ed 9f f7 .;..&.}...+.S...
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0080 - ef 77 d5 2b 7a 03 05 4d-43 c9 6d 42 51 47 d3 ac .w.+z..MC.mBQG..
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0090 - 62 28 f8 35 d0 e0 be 09-56 bc c9 fe 98 83 c1 cc b(.5....V.......
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00a0 - b3 af 04 7e 67 fb ca 7e-7e b3 0f 80 5d 8f 01 18 ...~g..~~...]...
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00b0 - 93 50 10 b1 5b 8d ae 95-2e 67 8b 30 72 a1 d8 af .P..[....g.0r...
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00c0 - 93 25 43 90 df 8d e5 a6-7e 57 96 85 6f 24 c0 1e .%C.....~W..o$..
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00d0 - 6b 86 ee 9d 9c k....
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Start Time: 1537337921
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Timeout : 7200 (sec)
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Verify return code: 0 (ok)
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---
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(以下略)
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```
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のような結果で、
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```
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SSL-Session:
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Protocol : TLSv1.2
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Cipher : ECDHE-RSA-AES128-GCM-SHA256
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Session-ID: 9279A0635D520A443EB6E4F8B49571E05E678212FDB4E2FEF21498BAEED9A042
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Session-ID-ctx:
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```
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とあります。
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対応していない場合
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```
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$ openssl s_client -connect www.google.com:443 -tls1_2
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unknown option -tls1_2
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usage: s_client args
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```
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オプションのエラーになります。
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