190 lines
7.4 KiB
Markdown
190 lines
7.4 KiB
Markdown
CipherScan
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==========
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```bash
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$ ./cipherscan jve.linuxwall.info
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........................
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Target: jve.linuxwall.info:443
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prio ciphersuite protocols pfs_keysize
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1 ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 ECDH,P-256,256bits
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2 ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ECDH,P-256,256bits
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3 DHE-RSA-AES128-GCM-SHA256 TLSv1.2 DH,2048bits
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4 DHE-RSA-AES256-GCM-SHA384 TLSv1.2 DH,2048bits
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5 ECDHE-RSA-AES128-SHA256 TLSv1.2 ECDH,P-256,256bits
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6 ECDHE-RSA-AES128-SHA TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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7 ECDHE-RSA-AES256-SHA384 TLSv1.2 ECDH,P-256,256bits
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8 ECDHE-RSA-AES256-SHA TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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9 DHE-RSA-AES128-SHA256 TLSv1.2 DH,2048bits
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10 DHE-RSA-AES128-SHA TLSv1,TLSv1.1,TLSv1.2 DH,2048bits
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11 DHE-RSA-AES256-SHA256 TLSv1.2 DH,2048bits
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12 DHE-RSA-AES256-SHA TLSv1,TLSv1.1,TLSv1.2 DH,2048bits
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13 AES128-GCM-SHA256 TLSv1.2
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14 AES256-GCM-SHA384 TLSv1.2
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15 AES128-SHA256 TLSv1.2
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16 AES256-SHA256 TLSv1.2
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17 AES128-SHA TLSv1,TLSv1.1,TLSv1.2
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18 AES256-SHA TLSv1,TLSv1.1,TLSv1.2
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19 DHE-RSA-CAMELLIA256-SHA TLSv1,TLSv1.1,TLSv1.2 DH,2048bits
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20 CAMELLIA256-SHA TLSv1,TLSv1.1,TLSv1.2
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21 DHE-RSA-CAMELLIA128-SHA TLSv1,TLSv1.1,TLSv1.2 DH,2048bits
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22 CAMELLIA128-SHA TLSv1,TLSv1.1,TLSv1.2
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23 DES-CBC3-SHA TLSv1,TLSv1.1,TLSv1.2
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Certificate: trusted, 2048 bit, sha256WithRSAEncryption signature
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TLS ticket lifetime hint: 300
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OCSP stapling: not supported
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Server side cipher ordering
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```
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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, TLS options, OCSP stapling and more. Cipherscan is a wrapper above the `openssl s_client` command line.
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Cipherscan is meant to run on all flavors of unix. It ships with its own built of OpenSSL for Linux/64 and Darwin/64. On other platform, it will use the openssl version provided by the operating system (which may have limited ciphers support), or your own version provided in the `-o` command line flag.
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Examples
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--------
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Basic test:
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```bash
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$ ./cipherscan google.com
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...................
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Target: google.com:443
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prio ciphersuite protocols pfs_keysize
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1 ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 ECDH,P-256,256bits
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2 ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 ECDH,P-256,256bits
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3 ECDHE-RSA-AES128-SHA TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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4 ECDHE-RSA-RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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5 AES128-GCM-SHA256 TLSv1.2
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6 AES128-SHA256 TLSv1.2
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7 AES128-SHA TLSv1.1,TLSv1.2
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8 RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
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9 RC4-MD5 SSLv3,TLSv1,TLSv1.1,TLSv1.2
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10 ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ECDH,P-256,256bits
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11 ECDHE-RSA-AES256-SHA384 TLSv1.2 ECDH,P-256,256bits
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12 ECDHE-RSA-AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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13 AES256-GCM-SHA384 TLSv1.2
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14 AES256-SHA256 TLSv1.2
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15 AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
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16 ECDHE-RSA-AES128-SHA256 TLSv1.2 ECDH,P-256,256bits
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17 ECDHE-RSA-DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits
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18 DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2
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Certificate: trusted, 2048 bit, sha1WithRSAEncryption signature
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TLS ticket lifetime hint: 100800
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OCSP stapling: not supported
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Server side cipher ordering
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```
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Testing STARTTLS:
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```
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darwin $ ./cipherscan -o ./openssl-mine -starttls xmpp jabber.ccc.de:5222
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.........
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.........
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prio ciphersuite protocols pfs_keysize
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1 DHE-RSA-AES256-SHA SSLv3,TLSv1 DH,1024bits
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2 AES256-SHA SSLv3,TLSv1
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3 EDH-RSA-DES-CBC3-SHA SSLv3,TLSv1 DH,1024bits
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4 DES-CBC3-SHA SSLv3,TLSv1
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5 DHE-RSA-AES128-SHA SSLv3,TLSv1 DH,1024bits
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6 AES128-SHA SSLv3,TLSv1
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7 RC4-SHA SSLv3,TLSv1
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8 RC4-MD5 SSLv3,TLSv1
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Certificate: UNTRUSTED, 2048 bit, sha1WithRSAEncryption signature
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```
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Exporting to JSON with the `-j` command line option:
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```javascript
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$ /cipherscan -j -starttls xmpp jabber.ccc.de:5222
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{
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"target": "jabber.ccc.de:5222",
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"date": "Sat, 19 Apr 2014 11:40:40 -0400",
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"ciphersuite": [
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{
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"cipher": "DHE-RSA-AES256-SHA",
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"protocols": [
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"SSLv3",
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"TLSv1"
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],
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"pubkey": [
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"2048"
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],
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"sigalg": [
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"sha1WithRSAEncryption"
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],
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"trusted": "False",
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"pfs": "DH,1024bits"
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}
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]
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}
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```
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Analyzing configurations
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------------------------
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The motivation behind cipherscan is to help operators configure good TLS on their
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endpoints. To help this further, the script `analyze.py` compares the results of
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a cipherscan with the TLS guidelines from https://wiki.mozilla.org/Security/Server_Side_TLS
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and output a level and recommendations.
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```bash
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$ ./analyze.py -t jve.linuxwall.info
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jve.linuxwall.info:443 has intermediate tls
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Changes needed to match the old level:
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* consider enabling SSLv3
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* add cipher DES-CBC3-SHA
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* use a certificate with sha1WithRSAEncryption signature
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* consider enabling OCSP Stapling
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Changes needed to match the intermediate level:
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* consider enabling OCSP Stapling
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Changes needed to match the modern level:
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* remove cipher AES128-GCM-SHA256
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* remove cipher AES256-GCM-SHA384
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* remove cipher AES128-SHA256
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* remove cipher AES128-SHA
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* remove cipher AES256-SHA256
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* remove cipher AES256-SHA
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* disable TLSv1
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* consider enabling OCSP Stapling
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```
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In the output above, `analyze.py` indicates that the target `jve.linuxwall.info`
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matches the intermediate configuration level. If the administrator of this site
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wants to reach the modern level, the items that failed under the modern tests
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should be corrected.
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`analyze.py` does not make any assumption on what a good level should be. Sites
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operators should now what level they want to match against, based on the
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compatibility level they want to support. Again, refer to
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https://wiki.mozilla.org/Security/Server_Side_TLS for more information.
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Note on Nagios mode:
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`analyse.py` can be ran as a nagios check with `--nagios`. The exit code will
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then represent the state of the configuration:
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* 2 (critical) for bad tls
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* 1 (warning) if it doesn't match the desired level
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* 0 (ok) if it matches.
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cipherscan can take more than 10 seconds to complete. To alleviate any timeout
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issues, you may want to run it outside of nagios, passing data through some
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temporary file.
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OpenSSL
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-------
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Cipherscan uses a custom release of openssl for linux 64 bits and darwin 64
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bits. OpenSSL is build from a custom branch maintained by Peter Mosmans that
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includes a number of patches not merged upstream. It can be found here:
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https://github.com/PeterMosmans/openssl
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Contributors
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------------
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* Julien Vehent <julien@linuxwall.info> (original author)
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* Hubert Kario <hkario@redhat.com>
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* Pepi Zawodsky <git@maclemon.at>
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* Michael Zeltner <m@niij.org>
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* Simon Deziel <simon.deziel@gmail.com>
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