SSL/TLS
Index
Transport Layer Security/ Secure Sockets Layer (SSL/TLS)
Secure Sockets Layer (SSL) is a widely used protocol for secure and authenticated connections between Web browsers and Web servers.
Check a SSL/TLS connection to a server
OpenSSL can be used to check the parameters of an SSL connection to a particular server, for example:
openssl s_client -connect www.microsoft.com:443Resulting in:
CONNECTED(00000005)
depth=2 C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
verify return:1
depth=1 C = US, O = Microsoft Corporation, CN = Microsoft Azure TLS Issuing CA 06
verify return:1
depth=0 C = US, ST = WA, L = Redmond, O = Microsoft Corporation, CN = www.microsoft.com
verify return:1
---
Certificate chain
0 s:C = US, ST = WA, L = Redmond, O = Microsoft Corporation, CN = www.microsoft.com
i:C = US, O = Microsoft Corporation, CN = Microsoft Azure TLS Issuing CA 06
1 s:C = US, O = Microsoft Corporation, CN = Microsoft Azure TLS Issuing CA 06
i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=C = US, ST = WA, L = Redmond, O = Microsoft Corporation, CN = www.microsoft.com
issuer=C = US, O = Microsoft Corporation, CN = Microsoft Azure TLS Issuing CA 06
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 4368 bytes and written 399 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 2048 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: 79E4C98601A3400F12807C54D26202A9145A2205ECE8A9ECCF35B82D5391C3C8
Session-ID-ctx:
Resumption PSK: BB1D8D7E0BD3B11DB702120DDB89809AA71CDC723FF9912D86142E38BA243E64C5E8FD2EA71A00FB954E5E3475703B1D
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 83100 (seconds)
TLS session ticket:
0000 - 00 00 35 6e 11 51 4f da-c0 0e 4e bb 71 b8 9b 41 ..5n.QO...N.q..A
0010 - 5a be dc a8 31 fa b3 21-d9 a1 77 0f a9 5e 66 c5 Z...1..!..w..^f.
0020 - 92 9f 82 00 e8 c8 48 cf-ff 16 8a 62 6d 94 af 59 ......H....bm..Y
0030 - 5d 61 03 77 31 96 aa d2-5b 91 e4 92 29 8c 3d c2 ]a.w1...[...).=.
0040 - d9 c6 79 eb 0b ce 2a 0d-fe 47 46 2a a9 7f eb a8 ..y...*..GF*....
0050 - 7e be b6 a2 10 db 75 5c-12 77 3b 96 f5 cd 45 81 ~.....u\.w;...E.
0060 - 5f ad e0 ff 43 a8 58 77-db 39 36 81 ab b2 6b 36 _...C.Xw.96...k6
0070 - c4 c1 a9 0b 99 e1 5e a8-34 a1 b4 72 97 78 86 a7 ......^.4..r.x..
0080 - 33 c7 ab ba 93 cf d7 a9-0c e4 54 4b 83 74 a0 5e 3.........TK.t.^
0090 - ba e1 a2 99 f7 14 86 79-e4 bd 41 4a cf 8f 93 de .......y..AJ....
00a0 - c4 87 80 4e 18 ee 65 68-15 53 8f 2d 56 5c 53 72 ...N..eh.S.-V\Sr
00b0 - 0b d3 40 05 9a ec 26 ff-2f e7 e0 24 e4 27 02 9c ..@...&./..$.'..
00c0 - 22 0b 84 36 39 ac 3a 15-7b 0b 3c 56 83 e2 82 43 "..69.:.{.<V...C
00d0 - c9 77 41 28 1b cf 45 c7-bc ef 3d f2 9b c1 3b 1b .wA(..E...=...;.
Start Time: 1667493148
Timeout : 7200 (sec)
Verify return code: 0 (ok)
Extended master secret: no
Max Early Data: 0
---
read R BLOCK
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
Protocol : TLSv1.3
Cipher : TLS_AES_256_GCM_SHA384
Session-ID: FDF5369ABC630434B2E11B78E29A2FC43FC0732A147D6D7EE1D370FF0D50595E
Session-ID-ctx:
Resumption PSK: D63C7DE07685AB98AF1C6CEEBAE63DE012A22290964DB41AC1D3B2817851C8F38677ECD4EE67E9405CE6A44F0F12688B
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 83100 (seconds)
TLS session ticket:
0000 - 00 00 35 6e 11 51 4f da-c0 0e 4e bb 71 b8 9b 41 ..5n.QO...N.q..A
0010 - ad 56 82 f3 74 6d 6d 53-d5 a8 b5 a9 e6 c5 55 e7 .V..tmmS......U.
0020 - c2 52 2e f2 d6 b5 cb 18-bd 23 82 63 df a6 8e 29 .R.......#.c...)
0030 - f3 32 c4 51 e5 c6 e2 29-d9 2f 78 43 45 51 5d c0 .2.Q...)./xCEQ].
0040 - be d8 8e 3b f5 b5 5b 2f-b8 ee ad ae fb bf 2b a7 ...;..[/......+.
0050 - 42 42 b7 af 4a 23 09 13-f4 2e 1f 58 9a d6 46 90 BB..J#.....X..F.
0060 - c4 76 f9 41 05 99 af 2e-77 85 d7 12 32 f0 21 97 .v.A....w...2.!.
0070 - 79 92 8e 39 31 97 f3 56-9b 06 fd 43 be 97 16 aa y..91..V...C....
0080 - 66 49 d8 2e 44 54 8f fe-e5 56 e9 5c 70 ed 79 b7 fI..DT...V.\p.y.
0090 - 93 4c 74 7b db d2 7f 97-76 84 a6 34 d0 67 0f e4 .Lt{....v..4.g..
00a0 - 3f a3 86 66 14 86 ae 19-0b e8 3d bf 43 ad df 83 ?..f......=.C...
00b0 - 29 95 b3 8c 52 9d 2d b4-95 7f e8 50 8f ea 05 04 )...R.-....P....
00c0 - d5 42 b9 07 b9 10 d5 ae-03 ca 16 18 b7 c4 dc f1 .B..............
00d0 - cc 8a 49 d7 4a 09 8d b2-e5 d8 3a 9a 98 ea b2 0c ..I.J.....:.....
Start Time: 1667493148
Timeout : 7200 (sec)
Verify return code: 0 (ok)
Extended master secret: no
Max Early Data: 0
---
read R BLOCK
closedGet a server digital certificate
We can obtain a server's digital certificate by doing the following:
echo | openssl s_client -connect www.google.com:443 2>&1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > google.crtAfter we have the certificate saved in a file (google.crt) we can view it.
openssl x509 -noout -text -in ./google.crt Resulting:
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
31:68:f6:7c:25:93:0f:e5
Signature Algorithm: sha256WithRSAEncryption
Issuer: C=US, O=Google Inc, CN=Google Internet Authority G2
Validity
Not Before: Oct 28 17:50:22 2015 GMT
Not After : Jan 26 00:00:00 2016 GMT
Subject: C=US, ST=California, L=Mountain View, O=Google Inc, CN=www.google.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
RSA Public Key: (2048 bit)
Modulus (2048 bit):
00:b4:4a:88:99:2c:74:01:6a:d4:4a:17:8a:b6:22:
34:e1:b7:91:c2:63:22:68:13:3f:f4:31:57:cd:91:
d8:c9:b6:b5:f4:77:19:7a:21:67:88:f4:b3:3e:cd:
64:2f:0d:ca:bf:f7:20:0c:1b:03:db:27:3e:46:da:
82:0f:fe:81:41:85:40:ae:bc:fe:8d:a8:a5:a6:92:
54:90:e2:d1:74:c6:1e:a5:ce:3e:32:4f:04:b9:67:
d1:e2:59:a3:1b:7d:d9:68:15:b2:f0:90:a4:a5:30:
16:3e:5f:6a:d9:07:14:d1:86:05:9c:38:e0:73:65:
e4:d4:4a:94:b3:93:e5:b2:06:23:14:d4:f3:e7:cf:
35:b7:45:ec:e9:07:dd:e0:bc:cb:5b:23:88:3a:1e:
8e:7e:02:fa:b7:83:2e:8f:9a:5c:f5:50:10:f2:f0:
3d:9b:d5:af:29:19:b3:39:7f:31:69:cb:bc:a7:36:
54:87:a0:c0:2a:55:d3:91:57:3e:97:83:98:e3:47:
65:8b:e8:32:98:43:cd:c1:b1:8b:a7:55:1e:73:0e:
81:2f:b4:5d:9c:e1:c1:cf:a7:2e:6f:b0:30:60:5d:
61:a7:02:b7:bc:6b:e9:0d:b8:00:78:ca:9f:fa:70:
8d:1f:f1:2b:a4:f0:a6:02:72:f4:23:35:e0:78:1c:
19:3d
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Subject Alternative Name:
DNS:www.google.com
Authority Information Access:
CA Issuers - URI:http://pki.google.com/GIAG2.crt
OCSP - URI:http://clients1.google.com/ocsp
X509v3 Subject Key Identifier:
95:CA:1C:F5:FB:39:28:C9:1C:7D:D2:3C:0E:85:68:01:7E:98:7B:4C
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Authority Key Identifier:
keyid:4A:DD:06:16:1B:BC:F6:68:B5:76:F5:81:B6:BB:62:1A:BA:5A:81:2F
X509v3 Certificate Policies:
Policy: 1.3.6.1.4.1.11129.2.5.1
Policy: 2.23.140.1.2.2
X509v3 CRL Distribution Points:
URI:http://pki.google.com/GIAG2.crl
Signature Algorithm: sha256WithRSAEncryption
36:57:20:af:df:78:82:4b:bf:83:98:01:06:db:c6:f1:c0:b8:
6d:b3:8c:ba:38:f3:46:d6:0b:2e:7a:5e:01:42:ca:29:90:37:
51:05:3c:e8:b3:f8:e8:42:91:0b:25:11:94:5d:f5:bc:eb:d3:
f0:37:79:a3:c0:03:f9:f3:1e:d9:61:a7:2a:a1:81:12:db:29:
2f:31:ee:8c:80:b2:e3:a0:5c:e4:03:97:93:31:94:44:23:fb:
4a:48:e2:39:e1:0d:1b:b6:49:66:6d:7b:2d:fb:69:9d:00:2c:
62:7c:dd:5c:cd:f1:4c:a0:35:cd:57:36:12:49:10:33:3e:7f:
e7:55:ac:f5:a5:f8:0e:e9:cd:51:fc:1a:25:fe:41:8c:6f:1a:
c1:f8:70:f9:f0:e2:b4:28:b1:ea:d9:49:f9:5e:1e:e3:51:4d:
51:59:6e:0f:26:91:2c:a6:69:37:df:98:a8:95:dd:3e:bc:fd:
9a:ee:4f:d4:bc:31:40:11:2c:e7:d1:2f:36:e6:26:7b:af:e6:
6f:41:9e:f4:27:3d:0b:b8:11:f4:67:09:08:ef:40:de:0c:ad:
fe:81:65:b6:4a:2d:de:02:78:73:43:c7:2c:06:18:b3:75:fd:
54:dd:f7:c9:1d:ad:6c:b2:aa:70:56:7b:e3:9f:8e:e3:86:63:
e6:b8:10:fcSSLscan
SSLscan is a tool that can be used to test the SSL/TLS protocol on a specific server and potencialy find some problems or even vulnerabilities.
Using it is quite simple:
sslscan www.google.comWhich results in the fllowing output.
Version: 2.0.15
OpenSSL 3.0.7 1 Nov 2022
Connected to 172.217.17.4
Testing SSL server www.google.com on port 443 using SNI name www.google.com
SSL/TLS Protocols:
SSLv2 disabled
SSLv3 disabled
TLSv1.0 enabled
TLSv1.1 enabled
TLSv1.2 enabled
TLSv1.3 enabled
TLS Fallback SCSV:
Server supports TLS Fallback SCSV
TLS renegotiation:
Secure session renegotiation supported
TLS Compression:
OpenSSL version does not support compression
Rebuild with zlib1g-dev package for zlib support
Heartbleed:
TLSv1.3 not vulnerable to heartbleed
TLSv1.2 not vulnerable to heartbleed
TLSv1.1 not vulnerable to heartbleed
TLSv1.0 not vulnerable to heartbleed
Supported Server Cipher(s):
Preferred TLSv1.3 128 bits TLS_AES_128_GCM_SHA256 Curve 25519 DHE 253
Accepted TLSv1.3 256 bits TLS_AES_256_GCM_SHA384 Curve 25519 DHE 253
Accepted TLSv1.3 256 bits TLS_CHACHA20_POLY1305_SHA256 Curve 25519 DHE 253
Preferred TLSv1.2 256 bits ECDHE-ECDSA-CHACHA20-POLY1305 Curve 25519 DHE 253
Accepted TLSv1.2 128 bits ECDHE-ECDSA-AES128-GCM-SHA256 Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-ECDSA-AES256-GCM-SHA384 Curve 25519 DHE 253
Accepted TLSv1.2 128 bits ECDHE-ECDSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-ECDSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-RSA-CHACHA20-POLY1305 Curve 25519 DHE 253
Accepted TLSv1.2 128 bits ECDHE-RSA-AES128-GCM-SHA256 Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-RSA-AES256-GCM-SHA384 Curve 25519 DHE 253
Accepted TLSv1.2 128 bits ECDHE-RSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.2 256 bits ECDHE-RSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.2 128 bits AES128-GCM-SHA256
Accepted TLSv1.2 256 bits AES256-GCM-SHA384
Accepted TLSv1.2 128 bits AES128-SHA
Accepted TLSv1.2 256 bits AES256-SHA
Accepted TLSv1.2 112 bits TLS_RSA_WITH_3DES_EDE_CBC_SHA
Preferred TLSv1.1 128 bits ECDHE-ECDSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.1 256 bits ECDHE-ECDSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.1 128 bits ECDHE-RSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.1 256 bits ECDHE-RSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.1 128 bits AES128-SHA
Accepted TLSv1.1 256 bits AES256-SHA
Accepted TLSv1.1 112 bits TLS_RSA_WITH_3DES_EDE_CBC_SHA
Preferred TLSv1.0 128 bits ECDHE-ECDSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.0 256 bits ECDHE-ECDSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.0 128 bits ECDHE-RSA-AES128-SHA Curve 25519 DHE 253
Accepted TLSv1.0 256 bits ECDHE-RSA-AES256-SHA Curve 25519 DHE 253
Accepted TLSv1.0 128 bits AES128-SHA
Accepted TLSv1.0 256 bits AES256-SHA
Accepted TLSv1.0 112 bits TLS_RSA_WITH_3DES_EDE_CBC_SHA
Server Key Exchange Group(s):
TLSv1.3 128 bits secp256r1 (NIST P-256)
TLSv1.3 128 bits x25519
TLSv1.2 128 bits secp256r1 (NIST P-256)
TLSv1.2 128 bits x25519
SSL Certificate:
Signature Algorithm: sha256WithRSAEncryption
ECC Curve Name: prime256v1
ECC Key Strength: 128
Subject: www.google.com
Altnames: DNS:www.google.com
Issuer: GTS CA 1C3
Not valid before: Sep 26 08:23:57 2022 GMT
Not valid after: Dec 19 08:23:56 2022 GMTSSLyze
SSLyze is also a tool that might be use to scan for SSL/TLS on a server. Using it is also very simple.
sslyze www.google.comWhich results in the following.
CHECKING CONNECTIVITY TO SERVER(S)
----------------------------------
www.google.com:443 => 142.250.200.132
SCAN RESULTS FOR WWW.GOOGLE.COM:443 - 142.250.200.132
-----------------------------------------------------
* Certificates Information:
Hostname sent for SNI: www.google.com
Number of certificates detected: 2
Certificate #0 ( _EllipticCurvePublicKey )
SHA1 Fingerprint: 8d451b91f4f3d1beaf7dfd745739a0a1ff9bb7b2
Common Name: www.google.com
Issuer: GTS CA 1C3
Serial Number: 172338986348961426169022814442718324929
Not Before: 2022-10-17
Not After: 2023-01-09
Public Key Algorithm: _EllipticCurvePublicKey
Signature Algorithm: sha256
Key Size: 256
Curve: secp256r1
DNS Subject Alternative Names: ['www.google.com']
Certificate #0 - Trust
Hostname Validation: OK - Certificate matches server hostname
Android CA Store (13.0.0_r8): OK - Certificate is trusted
Apple CA Store (iOS 15.1, iPadOS 15.1, macOS 12.1, tvOS 15.1, and watchOS 8.1):OK - Certificate is trusted
Java CA Store (jdk-13.0.2): OK - Certificate is trusted
Mozilla CA Store (2022-09-18): OK - Certificate is trusted
Windows CA Store (2022-08-15): OK - Certificate is trusted
Symantec 2018 Deprecation: OK - Not a Symantec-issued certificate
Received Chain: www.google.com --> GTS CA 1C3 --> GTS Root R1
Verified Chain: www.google.com --> GTS CA 1C3 --> GTS Root R1
Received Chain Contains Anchor: OK - Anchor certificate not sent
Received Chain Order: OK - Order is valid
Verified Chain contains SHA1: OK - No SHA1-signed certificate in the verified certificate chain
Certificate #0 - Extensions
OCSP Must-Staple: NOT SUPPORTED - Extension not found
Certificate Transparency: WARNING - Only 2 SCTs included but Google recommends 3 or more
Certificate #0 - OCSP Stapling
NOT SUPPORTED - Server did not send back an OCSP response
Certificate #1 ( _RSAPublicKey )
SHA1 Fingerprint: bb181548dc5db04f8194e588b4f19f1cc4d12a0d
Common Name: www.google.com
Issuer: GTS CA 1C3
Serial Number: 265906118735752094790635674560926019293
Not Before: 2022-10-17
Not After: 2023-01-09
Public Key Algorithm: _RSAPublicKey
Signature Algorithm: sha256
Key Size: 2048
Exponent: 65537
DNS Subject Alternative Names: ['www.google.com']
Certificate #1 - Trust
Hostname Validation: OK - Certificate matches server hostname
Android CA Store (13.0.0_r8): OK - Certificate is trusted
Apple CA Store (iOS 15.1, iPadOS 15.1, macOS 12.1, tvOS 15.1, and watchOS 8.1):OK - Certificate is trusted
Java CA Store (jdk-13.0.2): OK - Certificate is trusted
Mozilla CA Store (2022-09-18): OK - Certificate is trusted
Windows CA Store (2022-08-15): OK - Certificate is trusted
Symantec 2018 Deprecation: OK - Not a Symantec-issued certificate
Received Chain: www.google.com --> GTS CA 1C3 --> GTS Root R1
Verified Chain: www.google.com --> GTS CA 1C3 --> GTS Root R1
Received Chain Contains Anchor: OK - Anchor certificate not sent
Received Chain Order: OK - Order is valid
Verified Chain contains SHA1: OK - No SHA1-signed certificate in the verified certificate chain
Certificate #1 - Extensions
OCSP Must-Staple: NOT SUPPORTED - Extension not found
Certificate Transparency: WARNING - Only 2 SCTs included but Google recommends 3 or more
Certificate #1 - OCSP Stapling
NOT SUPPORTED - Server did not send back an OCSP response
* SSL 2.0 Cipher Suites:
Attempted to connect using 7 cipher suites; the server rejected all cipher suites.
* SSL 3.0 Cipher Suites:
Attempted to connect using 80 cipher suites; the server rejected all cipher suites.
* TLS 1.0 Cipher Suites:
Attempted to connect using 80 cipher suites.
The server accepted the following 5 cipher suites:
TLS_RSA_WITH_AES_256_CBC_SHA 256
TLS_RSA_WITH_AES_128_CBC_SHA 128
TLS_RSA_WITH_3DES_EDE_CBC_SHA 168
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)
The group of cipher suites supported by the server has the following properties:
Forward Secrecy OK - Supported
Legacy RC4 Algorithm OK - Not Supported
* TLS 1.1 Cipher Suites:
Attempted to connect using 80 cipher suites.
The server accepted the following 5 cipher suites:
TLS_RSA_WITH_AES_256_CBC_SHA 256
TLS_RSA_WITH_AES_128_CBC_SHA 128
TLS_RSA_WITH_3DES_EDE_CBC_SHA 168
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)
The group of cipher suites supported by the server has the following properties:
Forward Secrecy OK - Supported
Legacy RC4 Algorithm OK - Not Supported
* TLS 1.2 Cipher Suites:
Attempted to connect using 156 cipher suites.
The server accepted the following 11 cipher suites:
TLS_RSA_WITH_AES_256_GCM_SHA384 256
TLS_RSA_WITH_AES_256_CBC_SHA 256
TLS_RSA_WITH_AES_128_GCM_SHA256 128
TLS_RSA_WITH_AES_128_CBC_SHA 128
TLS_RSA_WITH_3DES_EDE_CBC_SHA 168
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 256 ECDH: prime256v1 (256 bits)
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 256 ECDH: prime256v1 (256 bits)
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 128 ECDH: prime256v1 (256 bits)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA 128 ECDH: prime256v1 (256 bits)
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)
The group of cipher suites supported by the server has the following properties:
Forward Secrecy OK - Supported
Legacy RC4 Algorithm OK - Not Supported
* TLS 1.3 Cipher Suites:
Attempted to connect using 5 cipher suites.
The server accepted the following 3 cipher suites:
TLS_CHACHA20_POLY1305_SHA256 256 ECDH: X25519 (253 bits)
TLS_AES_256_GCM_SHA384 256 ECDH: X25519 (253 bits)
TLS_AES_128_GCM_SHA256 128 ECDH: X25519 (253 bits)
* Deflate Compression:
OK - Compression disabled
* OpenSSL CCS Injection:
OK - Not vulnerable to OpenSSL CCS injection
* OpenSSL Heartbleed:
OK - Not vulnerable to Heartbleed
* ROBOT Attack:
OK - Not vulnerable.
* Session Renegotiation:
Client Renegotiation DoS Attack: OK - Not vulnerable
Secure Renegotiation: OK - Supported
* Elliptic Curve Key Exchange:
Supported curves: X25519, prime256v1
Rejected curves: X448, prime192v1, secp160k1, secp160r1, secp160r2, secp192k1, secp224k1, secp224r1, secp256k1, secp384r1, secp521r1, sect163k1, sect163r1, sect163r2, sect193r1, sect193r2, sect233k1, sect233r1, sect239k1, sect283k1, sect283r1, sect409k1, sect409r1, sect571k1, sect571r1
SCANS COMPLETED IN 4.242441 S
-----------------------------
COMPLIANCE AGAINST MOZILLA TLS CONFIGURATION
--------------------------------------------
Checking results against Mozilla's "intermediate" configuration. See https://ssl-config.mozilla.org/ for more details.
www.google.com:443: FAILED - Not compliant.
* tls_versions: TLS versions {'TLSv1', 'TLSv1.1'} are supported, but should be rejected.
* ciphers: Cipher suites {'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA', 'TLS_RSA_WITH_AES_256_CBC_SHA', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA', 'TLS_RSA_WITH_AES_128_CBC_SHA', 'TLS_RSA_WITH_3DES_EDE_CBC_SHA', 'TLS_RSA_WITH_AES_256_GCM_SHA384', 'TLS_RSA_WITH_AES_128_GCM_SHA256'} are supported, but should be rejected.testssl.sh
Another interesting tool to test SSL/TLS is to use the testssl.sh tool. It is also adequate to find problems on SSL/TLS servers.
To use it simply execute:
testssl.sh carlos.serrao.meThe obtained output is something like this (just a small portion):
Testing vulnerabilities
Heartbleed (CVE-2014-0160) not vulnerable (OK), no heartbeat extension
CCS (CVE-2014-0224) not vulnerable (OK)
Ticketbleed (CVE-2016-9244), experiment. not vulnerable (OK), no session ticket extension
ROBOT Server does not support any cipher suites that use RSA key transport
Secure Renegotiation (RFC 5746) supported (OK)
Secure Client-Initiated Renegotiation not vulnerable (OK)
CRIME, TLS (CVE-2012-4929) not vulnerable (OK)
BREACH (CVE-2013-3587) potentially NOT ok, "gzip" HTTP compression detected. - only supplied "/" tested
Can be ignored for static pages or if no secrets in the page
POODLE, SSL (CVE-2014-3566) not vulnerable (OK), no SSLv3 support
TLS_FALLBACK_SCSV (RFC 7507) No fallback possible (OK), no protocol below TLS 1.2 offered
SWEET32 (CVE-2016-2183, CVE-2016-6329) not vulnerable (OK)
FREAK (CVE-2015-0204) not vulnerable (OK)
DROWN (CVE-2016-0800, CVE-2016-0703) not vulnerable on this host and port (OK)
make sure you don't use this certificate elsewhere with SSLv2 enabled services
https://search.censys.io/search?resource=hosts&virtual_hosts=INCLUDE&q=C5D0C2C5E14B71CF7342F4BEAB81322EF9AD9B9BEEBB3D72ACB5E6360EA08C15
LOGJAM (CVE-2015-4000), experimental common prime with 2048 bits detected: RFC3526/Oakley Group 14 (2048 bits),
but no DH EXPORT ciphers
BEAST (CVE-2011-3389) not vulnerable (OK), no SSL3 or TLS1
LUCKY13 (CVE-2013-0169), experimental not vulnerable (OK)
RC4 (CVE-2013-2566, CVE-2015-2808) no RC4 ciphers detected (OK)SSL/TLS online tools
The following list presents some online tools for testing also SSL/TLS.
References/Additional information
Last updated