/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:03:38 UTC
  • Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.

If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default.  The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.

There is a "PFS" priority string specifier, but we can't use it because:

1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
   enables a lot more algorithms than "SECURE256".

2. It is only available since GnuTLS 3.2.4.

Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
Filename Latest Rev Last Changed Committer Comment Size
..
askpass-fifo.c 731 10 years ago Teddy Hogeborn askpass-fifo: Lower privileges after opening FIFO. 5.1 KB Diff Download File
askpass-fifo.xml 544 12 years ago Teddy Hogeborn Updated year in copyright notices. 4.9 KB Diff Download File
mandos-client.c 742 9 years ago Teddy Hogeborn Add ":!RSA" to GnuTLS priority string, to disallow 68 KB Diff Download File
mandos-client.xml 708 10 years ago Teddy Hogeborn mandos-keygen: Generate "checker" option to use SS 29 KB Diff Download File
password-prompt.c 679 10 years ago Teddy Hogeborn Update copyright year. * mandos-keygen: Update co 13.9 KB Diff Download File
password-prompt.xml 544 12 years ago Teddy Hogeborn Updated year in copyright notices. 9.5 KB Diff Download File
plymouth.c 679 10 years ago Teddy Hogeborn Update copyright year. * mandos-keygen: Update co 12.5 KB Diff Download File
plymouth.xml 544 12 years ago Teddy Hogeborn Updated year in copyright notices. 10.1 KB Diff Download File
splashy.c 679 10 years ago Teddy Hogeborn Update copyright year. * mandos-keygen: Update co 11.6 KB Diff Download File
splashy.xml 544 12 years ago Teddy Hogeborn Updated year in copyright notices. 10.2 KB Diff Download File
usplash.c 679 10 years ago Teddy Hogeborn Update copyright year. * mandos-keygen: Update co 16.2 KB Diff Download File
usplash.xml 544 12 years ago Teddy Hogeborn Updated year in copyright notices. 10.8 KB Diff Download File