The run_allciphers() function currently works by calling "$OPENSSL s_client" once for each cipher suite supported by $OPENSSL. In the case of "OpenSSL 1.0.2-chacha (1.0.2e-dev)" that means 195 calls to "$OPENSSL s_client" even though servers tend to only support a small fraction of these cipher suites.
This PR produces the same output as the current run_allciphers() with fewer calls to "$OPENSSL s_client", which results in the function running faster (usually much faster). The basic idea behind the revised function is to test cipher suites in blocks. If $OPENSSL supports 195 cipher suites, then it group these cipher suites into 4 blocks of 64 (with the final block being smaller). It makes one call to "$OPENSSL s_client" with cipher suites 1-64, and if it fails, then it knows that none of these 64 cipher suites are supported by the server and it doesn't need to perform any more tests on these 64 cipher suites. If it succeeds, then it breaks the 64 cipher suites into 4 blocks of 16 and calls "$OPENSSL s_client" with each of those blocks. The blocks of 16 that are successful are broken into blocks of 4, and for each of the successful blocks of 4 the individual cipher suites are tested.
For testssl.sh and www.google.com the number of calls to "$OPENSSL s_client" is reduced from 195 to 88. For github.com the number of calls is reduced to 56!
I haven't made any changes to run_cipher_per_proto yet, but if this PR is accepted I can make the same changes in that function.
Thanks,
David
* SHOW_EACH_C has now the correct logic
* pr_litemagenta ==> pr_warning
* fileout WARN according to pr_warning then changed appropiately
* some global vars in "" to avoid unneccessary shell expansion
* HAS_SSL2/HAS_SSL3 now works more reliably
* warning added in cipher order if ssl2/ssl3 is not supported by openssl
David Cooper
Dirk
Niko78
Thomas Patzke
Florian Baumann
Dave Cottlehuber
Thomas Martens
John Carver