/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 mandos-keygen.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:
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 "mandos-keygen">
5
 
<!ENTITY TIMESTAMP "2013-08-27">
 
5
<!ENTITY TIMESTAMP "2014-06-22">
6
6
<!ENTITY % common SYSTEM "common.ent">
7
7
%common;
8
8
]>
119
119
        <replaceable>TIME</replaceable></option></arg>
120
120
      </group>
121
121
      <sbr/>
122
 
      <arg><option>--force</option></arg>
 
122
      <group>
 
123
        <arg choice="plain"><option>--force</option></arg>
 
124
        <arg choice="plain"><option>-f</option></arg>
 
125
      </group>
123
126
    </cmdsynopsis>
124
127
    <cmdsynopsis>
125
128
      <command>&COMMANDNAME;</command>
145
148
        <arg choice="plain"><option>-n
146
149
        <replaceable>NAME</replaceable></option></arg>
147
150
      </group>
 
151
      <group>
 
152
        <arg choice="plain"><option>--no-ssh</option></arg>
 
153
        <arg choice="plain"><option>-S</option></arg>
 
154
      </group>
148
155
    </cmdsynopsis>
149
156
    <cmdsynopsis>
150
157
      <command>&COMMANDNAME;</command>
288
295
        <replaceable>TEXT</replaceable></option></term>
289
296
        <listitem>
290
297
          <para>
291
 
            Comment field for key.  The default value is
292
 
            <quote><literal>Mandos client key</literal></quote>.
 
298
            Comment field for key.  Default is empty.
293
299
          </para>
294
300
        </listitem>
295
301
      </varlistentry>
347
353
          </para>
348
354
        </listitem>
349
355
      </varlistentry>
 
356
      <varlistentry>
 
357
        <term><option>--no-ssh</option></term>
 
358
        <term><option>-S</option></term>
 
359
        <listitem>
 
360
          <para>
 
361
            When <option>--password</option> or
 
362
            <option>--passfile</option> is given, this option will
 
363
            prevent <command>&COMMANDNAME;</command> from calling
 
364
            <command>ssh-keyscan</command> to get an SSH fingerprint
 
365
            for this host and, if successful, output suitable config
 
366
            options to use this fingerprint as a
 
367
            <option>checker</option> option in the output.  This is
 
368
            otherwise the default behavior.
 
369
          </para>
 
370
        </listitem>
 
371
      </varlistentry>
350
372
    </variablelist>
351
373
  </refsect1>
352
374
  
503
525
      <citerefentry><refentrytitle>mandos</refentrytitle>
504
526
      <manvolnum>8</manvolnum></citerefentry>,
505
527
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
506
 
      <manvolnum>8mandos</manvolnum></citerefentry>
 
528
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
529
      <citerefentry><refentrytitle>ssh-keyscan</refentrytitle>
 
530
      <manvolnum>1</manvolnum></citerefentry>
507
531
    </para>
508
532
  </refsect1>
509
533