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Using the OpenSSL command to Test the SSL Certificate
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Using the OpenSSL command to Test the SSL Certificate

July 26, 2020 No Comments HTTPS

Usually, in the browser, by clicking the Lock icon, you can view the SSL certificate information.

ssl-certification-path Using the OpenSSL command to Test the SSL Certificate HTTPS

ssl-certification-path

And, we can also run the `openssl` command to view the server ceritifcate (e.g. SSL chain) on command line. For example:

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$ openssl s_client -connect helloacm.com:443
CONNECTED(00000003)
depth=2 C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
verify return:1
depth=1 C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
verify return:1
depth=0 C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
verify return:1
---
Certificate chain
 0 s:C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
   i:C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
 1 s:C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
   i:C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
---
Server certificate
-----BEGIN CERTIFICATE-----
MIIE5TCCBIugAwIBAgIQC5UFOgyjwCAycwdYqx90XzAKBggqhkjOPQQDAjBvMQsw
CQYDVQQGEwJVUzELMAkGA1UECBMCQ0ExFjAUBgNVBAcTDVNhbiBGcmFuY2lzY28x
GTAXBgNVBAoTEENsb3VkRmxhcmUsIEluYy4xIDAeBgNVBAMTF0Nsb3VkRmxhcmUg
SW5jIEVDQyBDQS0yMB4XDTIwMDMxOTAwMDAwMFoXDTIwMTAwOTEyMDAwMFowbTEL
MAkGA1UEBhMCVVMxCzAJBgNVBAgTAkNBMRYwFAYDVQQHEw1TYW4gRnJhbmNpc2Nv
MRkwFwYDVQQKExBDbG91ZGZsYXJlLCBJbmMuMR4wHAYDVQQDExVzbmkuY2xvdWRm
bGFyZXNzbC5jb20wWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAATdjmNNRSTaJQRg
3DBHzEMpKUtoNzciod0FgETrfMpPmtFjqKTVBywJenDP2SBmrYozrn3TpL4dQ3/X
PARGh74No4IDCTCCAwUwHwYDVR0jBBgwFoAUPnQtH89FdQR+P8Cihz5MQ4NRE8Yw
HQYDVR0OBBYEFPoMno5zzaoue3G90nO8fnAOFWzCMD4GA1UdEQQ3MDWCFXNuaS5j
bG91ZGZsYXJlc3NsLmNvbYIMaGVsbG9hY20uY29tgg4qLmhlbGxvYWNtLmNvbTAO
BgNVHQ8BAf8EBAMCB4AwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMHkG
A1UdHwRyMHAwNqA0oDKGMGh0dHA6Ly9jcmwzLmRpZ2ljZXJ0LmNvbS9DbG91ZEZs
YXJlSW5jRUNDQ0EyLmNybDA2oDSgMoYwaHR0cDovL2NybDQuZGlnaWNlcnQuY29t
L0Nsb3VkRmxhcmVJbmNFQ0NDQTIuY3JsMEwGA1UdIARFMEMwNwYJYIZIAYb9bAEB
MCowKAYIKwYBBQUHAgEWHGh0dHBzOi8vd3d3LmRpZ2ljZXJ0LmNvbS9DUFMwCAYG
Z4EMAQICMHYGCCsGAQUFBwEBBGowaDAkBggrBgEFBQcwAYYYaHR0cDovL29jc3Au
ZGlnaWNlcnQuY29tMEAGCCsGAQUFBzAChjRodHRwOi8vY2FjZXJ0cy5kaWdpY2Vy
dC5jb20vQ2xvdWRGbGFyZUluY0VDQ0NBLTIuY3J0MAwGA1UdEwEB/wQCMAAwggED
BgorBgEEAdZ5AgQCBIH0BIHxAO8AdQCyHgXMi6LNiiBOh2b5K7mKJSBna9r6cOey
SVMt74uQXgAAAXDz80rYAAAEAwBGMEQCIEl6oXM4EHydqzGMm8efrCUp4nEIaTKm
VbtHBTtarxxQAiBlhQ9R71vzf3M2M8UQEAN8yOVt0T5hl+Zb4yB+xDQ+UgB2APCV
pFnyANGCQBAtL5OIjq1L/h1H45nh0DSmsKiqjrJzAAABcPPzSyEAAAQDAEcwRQIh
AL4n31LbZn5nO+yXep4Kh0E4/4SMhpyBiOApVWLgWkjqAiBcWB6A4krBCl09ub8J
ttaFMV7+zPhjjTkt4toyrKu5iTAKBggqhkjOPQQDAgNIADBFAiAgA5xSHgF0Oa+f
dy8QoEUX7RCwTDQ+bSkfJ2A0JaAHBAIhAO6t2NuyqG8sLeEOEqj0L5Xqr72r4dRy
QpxHGpQRa3T7
-----END CERTIFICATE-----
subject=C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
 
issuer=C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
 
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 2507 bytes and written 394 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: 2369749FDF66D7BFD323F53958A27F6E45CDC2239A7FCDDCB1175A7C1C8B1466
    Session-ID-ctx: 
    Resumption PSK: EEA87720335AD216961F713DB0544F8A7E5F42223DEB2DBA992483D24D75F60809373FF82BEFEA0692C248151CC2BDDE
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 64800 (seconds)
    TLS session ticket:
    0000 - 24 29 83 3e 7e 68 72 88-be fe 43 06 e6 91 6b 2e   $).>~hr...C...k.
    0010 - 98 32 0b c2 4f 6f 60 d0-6b 60 e0 40 8b c6 03 62   .2..Oo`.k`.@...b
    0020 - 8f 8f 4c 25 ad 8c a1 22-c0 c7 47 94 5a 9e 97 18   ..L%..."..G.Z...
    0030 - 81 eb 2f 4a b6 4c 07 02-aa e0 91 43 95 1e d2 22   ../J.L.....C..."
    0040 - 6f 31 e5 2a 83 41 a1 6f-f9 ed 53 d2 0d 5d 89 cf   o1.*.A.o..S..]..
    0050 - 22 68 ad d9 bf 1d 49 b7-96 7f fc 09 6d 11 f5 f2   "h....I.....m...
    0060 - 2a 5d a6 35 f0 fb 54 f5-be 1a d8 1d 19 ec 80 40   *].5..T........@
    0070 - 57 15 cc a0 38 79 1d 47-34 75 81 73 77 ce ef d2   W...8y.G4u.sw...
    0080 - e9 17 ee 66 63 d2 2f c6-29 ce 74 f0 62 1d 49 b2   ...fc./.).t.b.I.
    0090 - bc c5 da 62 24 e3 42 97-b2 13 e2 97 ed 7c 2d dc   ...b$.B......|-.
    00a0 - d3 55 ac 3e 66 92 43 af-11 ba 41 60 66 c0 f4 f7   .U.>f.C...A`f...
    00b0 - 74 4a 1b 7c dd d9 8d 21-9b fe a0 ae 3f 97 37 4b   tJ.|...!....?.7K
    00c0 - ef c5 d5 34 31 93 30 ab-9f 8b 8b 2d f5 3f 21 1f   ...41.0....-.?!.
 
    Start Time: 1595760329
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
    Max Early Data: 14336
---
read R BLOCK
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: B126A49538D22C054CC7A61988EAB35538A7953C1516C98A52513E81C6245B73
    Session-ID-ctx: 
    Resumption PSK: 16E0F2E582F4AF8120E79B33C54CA75E64FEFA6B8EF5CF819C59AEA63A0DBB96DE445563EF1D6C87028CE71BE1B5D137
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 64800 (seconds)
    TLS session ticket:
    0000 - 24 29 83 3e 7e 68 72 88-be fe 43 06 e6 91 6b 2e   $).>~hr...C...k.
    0010 - bb 07 3e 5b c8 33 49 bf-c4 23 d4 0b 29 04 c7 61   ..>[.3I..#..)..a
    0020 - b9 63 d7 79 19 0d 00 55-fc 96 cc e4 2e d3 a5 d1   .c.y...U........
    0030 - 86 91 13 e1 5d b7 91 ef-e0 ef 1b 3d ed eb e0 c3   ....]......=....
    0040 - 74 a8 06 ce 03 8d 1e c0-a1 47 5e a1 94 3c 4c 60   t........G^..<L`
    0050 - 84 62 e2 87 c9 0b 63 32-f7 6c 32 20 8c 98 d3 e3   .b....c2.l2 ....
    0060 - f9 73 47 61 dd 1e 26 48-e7 46 ee 9a 47 bf 01 af   .sGa..&H.F..G...
    0070 - 78 51 a8 2d 20 cd ee 1a-c2 5f 88 c0 c8 70 ba 8a   xQ.- ...._...p..
    0080 - a7 99 d3 ba 23 46 d0 bd-e0 3d b4 82 b5 e9 7e 64   ....#F...=....~d
    0090 - b1 96 84 c7 4b d8 5c 83-22 a6 96 b0 8d 0e 51 5b   ....K.\.".....Q[
    00a0 - aa 1e d8 82 e6 36 1b b7-1f 46 18 3c 89 28 4d a8   .....6...F.<.(M.
    00b0 - ca 3f 37 83 16 e6 85 2a-ea 98 80 b7 da 20 3f f3   .?7....*..... ?.
    00c0 - fc 74 9a 88 3b a8 07 07-f4 bb 19 af 19 82 5a bd   .t..;.........Z.
 
    Start Time: 1595760329
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
    Max Early Data: 14336
---
read R BLOCK
closed
$ openssl s_client -connect helloacm.com:443
CONNECTED(00000003)
depth=2 C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
verify return:1
depth=1 C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
verify return:1
depth=0 C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
verify return:1
---
Certificate chain
 0 s:C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com
   i:C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
 1 s:C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2
   i:C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = sni.cloudflaressl.com

issuer=C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2

---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 2507 bytes and written 394 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: 2369749FDF66D7BFD323F53958A27F6E45CDC2239A7FCDDCB1175A7C1C8B1466
    Session-ID-ctx: 
    Resumption PSK: EEA87720335AD216961F713DB0544F8A7E5F42223DEB2DBA992483D24D75F60809373FF82BEFEA0692C248151CC2BDDE
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 64800 (seconds)
    TLS session ticket:
    0000 - 24 29 83 3e 7e 68 72 88-be fe 43 06 e6 91 6b 2e   $).>~hr...C...k.
    0010 - 98 32 0b c2 4f 6f 60 d0-6b 60 e0 40 8b c6 03 62   .2..Oo`.k`[email protected]
    0020 - 8f 8f 4c 25 ad 8c a1 22-c0 c7 47 94 5a 9e 97 18   ..L%..."..G.Z...
    0030 - 81 eb 2f 4a b6 4c 07 02-aa e0 91 43 95 1e d2 22   ../J.L.....C..."
    0040 - 6f 31 e5 2a 83 41 a1 6f-f9 ed 53 d2 0d 5d 89 cf   o1.*.A.o..S..]..
    0050 - 22 68 ad d9 bf 1d 49 b7-96 7f fc 09 6d 11 f5 f2   "h....I.....m...
    0060 - 2a 5d a6 35 f0 fb 54 f5-be 1a d8 1d 19 ec 80 40   *].5..T........@
    0070 - 57 15 cc a0 38 79 1d 47-34 75 81 73 77 ce ef d2   W...8y.G4u.sw...
    0080 - e9 17 ee 66 63 d2 2f c6-29 ce 74 f0 62 1d 49 b2   ...fc./.).t.b.I.
    0090 - bc c5 da 62 24 e3 42 97-b2 13 e2 97 ed 7c 2d dc   ...b$.B......|-.
    00a0 - d3 55 ac 3e 66 92 43 af-11 ba 41 60 66 c0 f4 f7   .U.>f.C...A`f...
    00b0 - 74 4a 1b 7c dd d9 8d 21-9b fe a0 ae 3f 97 37 4b   tJ.|...!....?.7K
    00c0 - ef c5 d5 34 31 93 30 ab-9f 8b 8b 2d f5 3f 21 1f   ...41.0....-.?!.

    Start Time: 1595760329
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
    Max Early Data: 14336
---
read R BLOCK
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
    Protocol  : TLSv1.3
    Cipher    : TLS_AES_256_GCM_SHA384
    Session-ID: B126A49538D22C054CC7A61988EAB35538A7953C1516C98A52513E81C6245B73
    Session-ID-ctx: 
    Resumption PSK: 16E0F2E582F4AF8120E79B33C54CA75E64FEFA6B8EF5CF819C59AEA63A0DBB96DE445563EF1D6C87028CE71BE1B5D137
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 64800 (seconds)
    TLS session ticket:
    0000 - 24 29 83 3e 7e 68 72 88-be fe 43 06 e6 91 6b 2e   $).>~hr...C...k.
    0010 - bb 07 3e 5b c8 33 49 bf-c4 23 d4 0b 29 04 c7 61   ..>[.3I..#..)..a
    0020 - b9 63 d7 79 19 0d 00 55-fc 96 cc e4 2e d3 a5 d1   .c.y...U........
    0030 - 86 91 13 e1 5d b7 91 ef-e0 ef 1b 3d ed eb e0 c3   ....]......=....
    0040 - 74 a8 06 ce 03 8d 1e c0-a1 47 5e a1 94 3c 4c 60   t........G^..<L`
    0050 - 84 62 e2 87 c9 0b 63 32-f7 6c 32 20 8c 98 d3 e3   .b....c2.l2 ....
    0060 - f9 73 47 61 dd 1e 26 48-e7 46 ee 9a 47 bf 01 af   .sGa..&H.F..G...
    0070 - 78 51 a8 2d 20 cd ee 1a-c2 5f 88 c0 c8 70 ba 8a   xQ.- ...._...p..
    0080 - a7 99 d3 ba 23 46 d0 bd-e0 3d b4 82 b5 e9 7e 64   ....#F...=....~d
    0090 - b1 96 84 c7 4b d8 5c 83-22 a6 96 b0 8d 0e 51 5b   ....K.\.".....Q[
    00a0 - aa 1e d8 82 e6 36 1b b7-1f 46 18 3c 89 28 4d a8   .....6...F.<.(M.
    00b0 - ca 3f 37 83 16 e6 85 2a-ea 98 80 b7 da 20 3f f3   .?7....*..... ?.
    00c0 - fc 74 9a 88 3b a8 07 07-f4 bb 19 af 19 82 5a bd   .t..;.........Z.

    Start Time: 1595760329
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
    Max Early Data: 14336
---
read R BLOCK
closed

--EOF (The Ultimate Computing & Technology Blog) --

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