/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release

« back to all changes in this revision

Viewing changes to plugins.d/usplash.xml

  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:03:38 UTC
  • mto: (237.7.304 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • 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.

Show diffs side-by-side

added added

removed removed

Lines of Context:
plugins.d/usplash.xml
2
2
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3
3
        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4
4
<!ENTITY COMMANDNAME "usplash">
5
 
<!ENTITY TIMESTAMP "2019-02-10">
 
5
<!ENTITY TIMESTAMP "2012-01-01">
6
6
<!ENTITY % common SYSTEM "../common.ent">
7
7
%common;
8
8
]>
33
33
    <copyright>
34
34
      <year>2008</year>
35
35
      <year>2009</year>
36
 
      <year>2010</year>
37
36
      <year>2011</year>
38
37
      <year>2012</year>
39
 
      <year>2013</year>
40
 
      <year>2014</year>
41
 
      <year>2015</year>
42
 
      <year>2016</year>
43
 
      <year>2017</year>
44
 
      <year>2018</year>
45
 
      <year>2019</year>
46
38
      <holder>Teddy Hogeborn</holder>
47
39
      <holder>Björn Påhlsson</holder>
48
40
    </copyright>
135
127
        <para>
136
128
          These variables will normally be inherited from
137
129
          <citerefentry><refentrytitle>plugin-runner</refentrytitle>
138
 
          <manvolnum>8mandos</manvolnum></citerefentry>, which might
139
 
          have in turn inherited them from its calling process.
 
130
          <manvolnum>8mandos</manvolnum></citerefentry>, which will
 
131
          normally have inherited them from
 
132
          <filename>/scripts/local-top/cryptroot</filename> in the
 
133
          initial <acronym>RAM</acronym> disk environment, which will
 
134
          have set them from parsing kernel arguments and
 
135
          <filename>/conf/conf.d/cryptroot</filename> (also in the
 
136
          initial RAM disk environment), which in turn will have been
 
137
          created when the initial RAM disk image was created by
 
138
          <filename
 
139
          >/usr/share/initramfs-tools/hooks/cryptroot</filename>, by
 
140
          extracting the information of the root file system from
 
141
          <filename >/etc/crypttab</filename>.
140
142
        </para>
141
143
        <para>
142
144
          This behavior is meant to exactly mirror the behavior of
216
218
      is ugly, but necessary as long as it does not support aborting a
217
219
      password request.
218
220
    </para>
219
 
    <xi:include href="../bugs.xml"/>
220
221
  </refsect1>
221
222
  
222
223
  <refsect1 id="example">
280
281
    <para>
281
282
      <citerefentry><refentrytitle>intro</refentrytitle>
282
283
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
284
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
285
      <manvolnum>5</manvolnum></citerefentry>,
283
286
      <citerefentry><refentrytitle>fifo</refentrytitle>
284
287
      <manvolnum>7</manvolnum></citerefentry>,
285
288
      <citerefentry><refentrytitle>plugin-runner</refentrytitle>