A very simple way to find out which SSL/TLS ciphersuites are supported by a target.
Cipherscan tests the ordering of the SSL/TLS ciphers on a given target, for all major versions of SSL and TLS. It also extracts some certificates informations. Cipherscan uses the openssl s_client command line to run the tests.
On Linux x86_64 run: ./cipherscan www.google.com:443 On any other *nix or *tux run: ./cipherscan -o /path/to/openssl www.google.com:443 and watch.
The newer your version of openssl, the better results you'll get. Versions of OpenSSL below 1.0.1 don't support TLS1.2 ciphers, elliptic curves, etc... Build your own or test what your system's OpenSSL supports.
Cipherscan should work fine on Linux, Mac OS X, Solaris, Illumos, SmartOS, OpenIndiana if you specify a an openssl binary with -o.
The OpenSSL binary in this repository is built for 64bit Linux. If you wish to build a version with the same features for your own platform, the snapshot from the OpenSSL gitweb view and build it like this:
./config no-shared
make
And get the binary from app/openssl. (./config will ask you to run make depend which will fail - for our purposes this step is not required)
-a | --allciphers Test all known ciphers individually at the end.
-b | --benchmark Activate benchmark mode.
-d | --delay Pause for n seconds between connections
-D | --debug Output ALL the information.
-h | --help Shows this help text.
-j | --json Output results in JSON format.
-o | --openssl path/to/your/openssl binary you want to use.
-v | --verbose Increase verbosity.
Testing plain SSL/TLS:
linux $ ./cipherscan www.google.com:443
...................
prio ciphersuite protocols pfs_keysize
1 ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 ECDH,P-256,256bits
2 ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 ECDH,P-256,256bits
3 ECDHE-RSA-AES128-SHA TLSv1.1,TLSv1.2 ECDH,P-256,256bits
4 ECDHE-RSA-RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
5 AES128-GCM-SHA256 TLSv1.2
6 AES128-SHA256 TLSv1.2
7 AES128-SHA TLSv1.1,TLSv1.2
8 RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
9 RC4-MD5 SSLv3,TLSv1,TLSv1.1,TLSv1.2
10 ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ECDH,P-256,256bits
11 ECDHE-RSA-AES256-SHA384 TLSv1.2 ECDH,P-256,256bits
12 ECDHE-RSA-AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
13 AES256-GCM-SHA384 TLSv1.2
14 AES256-SHA256 TLSv1.2
15 AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
16 ECDHE-RSA-DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
17 DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
18 ECDHE-RSA-AES128-SHA256 TLSv1.2 ECDH,P-256,256bits
Certificate: trusted, 2048 bit, sha1WithRSAEncryption signature
Testing STARTTLS:
darwin $ ./cipherscan -o ./openssl-mine -starttls xmpp jabber.ccc.de:5222
.........
.........
prio ciphersuite protocols pfs_keysize
1 DHE-RSA-AES256-SHA SSLv3,TLSv1 DH,1024bits
2 AES256-SHA SSLv3,TLSv1
3 EDH-RSA-DES-CBC3-SHA SSLv3,TLSv1 DH,1024bits
4 DES-CBC3-SHA SSLv3,TLSv1
5 DHE-RSA-AES128-SHA SSLv3,TLSv1 DH,1024bits
6 AES128-SHA SSLv3,TLSv1
7 RC4-SHA SSLv3,TLSv1
8 RC4-MD5 SSLv3,TLSv1
Certificate: UNTRUSTED, 2048 bit, sha1WithRSAEncryption signature
Exporting to JSON with the -j command line option:
$ /cipherscan -j -starttls xmpp jabber.ccc.de:5222
{
"target": "jabber.ccc.de:5222",
"date": "Sat, 19 Apr 2014 11:40:40 -0400",
"ciphersuite": [
{
"cipher": "DHE-RSA-AES256-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "DH,1024bits"
},
{
"cipher": "AES256-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "None"
},
{
"cipher": "EDH-RSA-DES-CBC3-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "DH,1024bits"
},
{
"cipher": "DES-CBC3-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "None"
},
{
"cipher": "DHE-RSA-AES128-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "DH,1024bits"
},
{
"cipher": "AES128-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "None"
},
{
"cipher": "RC4-SHA",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "None"
},
{
"cipher": "RC4-MD5",
"protocols": [
"SSLv3",
"TLSv1"
],
"pubkey": [
"2048"
],
"sigalg": [
"sha1WithRSAEncryption"
],
"trusted": "False",
"pfs": "None"
}
]
}The motivation behind cipherscan is to help admins configure good TLS on their
endpoints. To help this further, the script analyze.py compares the results of
a cipherscan with the TLS guidelines from https://wiki.mozilla.org/Security/Server_Side_TLS
and output a level and recommendations.
$ ./analyze.py -t jve.linuxwall.info
jve.linuxwall.info:443 has intermediate tls
Changes needed to match the old level:
* consider enabling SSLv3
* add cipher DES-CBC3-SHA
* use a certificate with sha1WithRSAEncryption signature
* consider enabling OCSP Stapling
Changes needed to match the intermediate level:
* consider enabling OCSP Stapling
Changes needed to match the modern level:
* remove cipher AES128-GCM-SHA256
* remove cipher AES256-GCM-SHA384
* remove cipher AES128-SHA256
* remove cipher AES128-SHA
* remove cipher AES256-SHA256
* remove cipher AES256-SHA
* disable TLSv1
* consider enabling OCSP StaplingIn the output above, analyze.py indicates that the target jve.linuxwall.info
matches the intermediate configuration level. If the administrator of this site
wants to reach the modern level, the items that failed under the modern tests
should be corrected.
analyze.py does not make any assumption on what a good level should be. Sites
operators should now what level they want to match against, based on the
compatibility level they want to support. Again, refer to
https://wiki.mozilla.org/Security/Server_Side_TLS for more information.
- Julien Vehent julien@linuxwall.info (original author)
- Hubert Kario hkario@redhat.com
- Pepi Zawodsky git@maclemon.at
- Michael Zeltner m@niij.org
- Simon Deziel simon.deziel@gmail.com