mirror of
https://github.com/mozilla/cipherscan.git
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229 lines
9.5 KiB
Markdown
229 lines
9.5 KiB
Markdown
CipherScan
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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 curves
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1 ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 ECDH,P-256,256bits prime256v1
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2 ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 ECDH,P-256,256bits prime256v1
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3 ECDHE-RSA-AES128-SHA TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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4 ECDHE-RSA-RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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5 AES128-GCM-SHA256 TLSv1.2 None None
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6 AES128-SHA256 TLSv1.2 None None
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7 AES128-SHA TLSv1.1,TLSv1.2 None None
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8 RC4-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 None None
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9 RC4-MD5 SSLv3,TLSv1,TLSv1.1,TLSv1.2 None None
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10 ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ECDH,P-256,256bits prime256v1
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11 ECDHE-RSA-AES256-SHA384 TLSv1.2 ECDH,P-256,256bits prime256v1
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12 ECDHE-RSA-AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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13 AES256-GCM-SHA384 TLSv1.2 None None
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14 AES256-SHA256 TLSv1.2 None None
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15 AES256-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 None None
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16 ECDHE-RSA-AES128-SHA256 TLSv1.2 ECDH,P-256,256bits prime256v1
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17 ECDHE-RSA-DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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18 DES-CBC3-SHA SSLv3,TLSv1,TLSv1.1,TLSv1.2 None None
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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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Cipher ordering: server
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```
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Testing STARTTLS:
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```
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darwin$ $ ./cipherscan --curves -starttls xmpp jabber.ccc.de:5222
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................................
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Target: jabber.ccc.de:5222
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prio ciphersuite protocols pfs curves
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1 ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ECDH,P-256,256bits prime256v1
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2 ECDHE-RSA-AES256-SHA384 TLSv1.2 ECDH,P-256,256bits prime256v1
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3 ECDHE-RSA-AES256-SHA TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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4 DHE-RSA-AES256-GCM-SHA384 TLSv1.2 DH,1024bits None
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5 DHE-RSA-AES256-SHA256 TLSv1.2 DH,1024bits None
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6 DHE-RSA-AES256-SHA TLSv1,TLSv1.1,TLSv1.2 DH,1024bits None
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7 DHE-RSA-CAMELLIA256-SHA TLSv1,TLSv1.1,TLSv1.2 DH,1024bits None
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8 AES256-GCM-SHA384 TLSv1.2 None None
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9 AES256-SHA256 TLSv1.2 None None
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10 AES256-SHA TLSv1,TLSv1.1,TLSv1.2 None None
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11 CAMELLIA256-SHA TLSv1,TLSv1.1,TLSv1.2 None None
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12 ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 ECDH,P-256,256bits prime256v1
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13 ECDHE-RSA-AES128-SHA256 TLSv1.2 ECDH,P-256,256bits prime256v1
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14 ECDHE-RSA-AES128-SHA TLSv1,TLSv1.1,TLSv1.2 ECDH,P-256,256bits prime256v1
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15 DHE-RSA-AES128-GCM-SHA256 TLSv1.2 DH,1024bits None
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16 DHE-RSA-AES128-SHA256 TLSv1.2 DH,1024bits None
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17 DHE-RSA-AES128-SHA TLSv1,TLSv1.1,TLSv1.2 DH,1024bits None
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18 DHE-RSA-SEED-SHA TLSv1,TLSv1.1,TLSv1.2 DH,1024bits None
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19 DHE-RSA-CAMELLIA128-SHA TLSv1,TLSv1.1,TLSv1.2 DH,1024bits None
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20 AES128-GCM-SHA256 TLSv1.2 None None
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21 AES128-SHA256 TLSv1.2 None None
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22 AES128-SHA TLSv1,TLSv1.1,TLSv1.2 None None
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23 SEED-SHA TLSv1,TLSv1.1,TLSv1.2 None None
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24 CAMELLIA128-SHA TLSv1,TLSv1.1,TLSv1.2 None None
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Certificate: UNTRUSTED, 2048 bit, sha1WithRSAEncryption signature
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TLS ticket lifetime hint: None
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OCSP stapling: not supported
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Cipher ordering: client
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Curves ordering: server
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Curves fallback: False
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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 --curves -j www.ebay.com | j
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{
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"curves_fallback": "False",
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"serverside": "True",
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"target": "www.ebay.com:443",
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"utctimestamp": "2015-04-03T14:54:31.0Z",
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"ciphersuite": [
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{
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"cipher": "AES256-SHA",
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"ocsp_stapling": "False",
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"pfs": "None",
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"protocols": [
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"TLSv1",
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"TLSv1.1",
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"TLSv1.2"
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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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"ticket_hint": "None",
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"trusted": "True"
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},
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{
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"cipher": "ECDHE-RSA-DES-CBC3-SHA",
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"curves": [
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"prime256v1",
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"secp384r1",
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"secp224r1",
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"secp521r1"
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],
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"curves_ordering": "server",
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"ocsp_stapling": "False",
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"pfs": "ECDH,P-256,256bits",
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"protocols": [
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"TLSv1",
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"TLSv1.1",
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"TLSv1.2"
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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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"ticket_hint": "None",
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"trusted": "True"
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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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You can build it yourself using following commands:
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```
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git clone https://github.com/PeterMosmans/openssl.git --depth 1 -b 1.0.2-chacha
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cd openssl
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./Configure zlib no-shared experimental-jpake enable-md2 enable-rc5 \
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enable-rfc3779 enable-gost enable-static-engine linux-x86_64
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make depend
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make
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make report
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```
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The statically linked binary will be `apps/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> (co-maintainer)
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* Pepi Zawodsky <git@maclemon.at>
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* Michael Zeltner <m@niij.org>
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* Peter Mosmans <support@go-forward.net>
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* Vincent Riquer <v.riquer@b2f-concept.com>
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* Christian Stadelmann <dev@genodeftest.de>
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* Simon Deziel <simon.deziel@gmail.com>
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* Aaron Zauner <azet@azet.org>
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* Mike <mikedawg@gmail.com>
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* Phil Cohen <phlipper@users.noreply.github.com>
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* Samuel Kleiner <sam@firstbanco.com>
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* Richard Soderberg <https://twitter.com/floatingatoll>
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