/mandos/trunk

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

« back to all changes in this revision

Viewing changes to mandos-keygen.xml

  • 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.

Show diffs side-by-side

added added

removed removed

Lines of Context:
mandos-keygen.xml
1
1
<?xml version="1.0" encoding="UTF-8"?>
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
 
<!ENTITY VERSION "1.0">
5
4
<!ENTITY COMMANDNAME "mandos-keygen">
6
 
<!ENTITY TIMESTAMP "2008-09-03">
 
5
<!ENTITY TIMESTAMP "2014-06-22">
 
6
<!ENTITY % common SYSTEM "common.ent">
 
7
%common;
7
8
]>
8
9
 
9
10
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
11
12
    <title>Mandos Manual</title>
12
13
    <!-- NWalsh’s docbook scripts use this to generate the footer: -->
13
14
    <productname>Mandos</productname>
14
 
    <productnumber>&VERSION;</productnumber>
 
15
    <productnumber>&version;</productnumber>
15
16
    <date>&TIMESTAMP;</date>
16
17
    <authorgroup>
17
18
      <author>
18
19
        <firstname>Björn</firstname>
19
20
        <surname>Påhlsson</surname>
20
21
        <address>
21
 
          <email>belorn@fukt.bsnet.se</email>
 
22
          <email>belorn@recompile.se</email>
22
23
        </address>
23
24
      </author>
24
25
      <author>
25
26
        <firstname>Teddy</firstname>
26
27
        <surname>Hogeborn</surname>
27
28
        <address>
28
 
          <email>teddy@fukt.bsnet.se</email>
 
29
          <email>teddy@recompile.se</email>
29
30
        </address>
30
31
      </author>
31
32
    </authorgroup>
32
33
    <copyright>
33
34
      <year>2008</year>
 
35
      <year>2009</year>
 
36
      <year>2011</year>
 
37
      <year>2012</year>
34
38
      <holder>Teddy Hogeborn</holder>
35
39
      <holder>Björn Påhlsson</holder>
36
40
    </copyright>
37
41
    <xi:include href="legalnotice.xml"/>
38
42
  </refentryinfo>
39
 
 
 
43
  
40
44
  <refmeta>
41
45
    <refentrytitle>&COMMANDNAME;</refentrytitle>
42
46
    <manvolnum>8</manvolnum>
48
52
      Generate key and password for Mandos client and server.
49
53
    </refpurpose>
50
54
  </refnamediv>
51
 
 
 
55
  
52
56
  <refsynopsisdiv>
53
57
    <cmdsynopsis>
54
58
      <command>&COMMANDNAME;</command>
115
119
        <replaceable>TIME</replaceable></option></arg>
116
120
      </group>
117
121
      <sbr/>
118
 
      <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>
119
126
    </cmdsynopsis>
120
127
    <cmdsynopsis>
121
128
      <command>&COMMANDNAME;</command>
122
129
      <group choice="req">
123
130
        <arg choice="plain"><option>--password</option></arg>
124
131
        <arg choice="plain"><option>-p</option></arg>
 
132
        <arg choice="plain"><option>--passfile
 
133
        <replaceable>FILE</replaceable></option></arg>
 
134
        <arg choice="plain"><option>-F</option>
 
135
        <replaceable>FILE</replaceable></arg>
125
136
      </group>
126
137
      <sbr/>
127
138
      <group>
137
148
        <arg choice="plain"><option>-n
138
149
        <replaceable>NAME</replaceable></option></arg>
139
150
      </group>
 
151
      <group>
 
152
        <arg choice="plain"><option>--no-ssh</option></arg>
 
153
        <arg choice="plain"><option>-S</option></arg>
 
154
      </group>
140
155
    </cmdsynopsis>
141
156
    <cmdsynopsis>
142
157
      <command>&COMMANDNAME;</command>
159
174
    <para>
160
175
      <command>&COMMANDNAME;</command> is a program to generate the
161
176
      OpenPGP key used by
162
 
      <citerefentry><refentrytitle>password-request</refentrytitle>
 
177
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
163
178
      <manvolnum>8mandos</manvolnum></citerefentry>.  The key is
164
179
      normally written to /etc/mandos for later installation into the
165
180
      initrd image, but this, and most other things, can be changed
167
182
    </para>
168
183
    <para>
169
184
      This program can also be used with the
170
 
      <option>--password</option> option to generate a ready-made
171
 
      section for <filename>clients.conf</filename> (see
 
185
      <option>--password</option> or <option>--passfile</option>
 
186
      options to generate a ready-made section for
 
187
      <filename>clients.conf</filename> (see
172
188
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
173
189
      <manvolnum>5</manvolnum></citerefentry>).
174
190
    </para>
197
213
          </para>
198
214
        </listitem>
199
215
      </varlistentry>
200
 
 
 
216
      
201
217
      <varlistentry>
202
218
        <term><option>--dir
203
219
        <replaceable>DIRECTORY</replaceable></option></term>
206
222
        <listitem>
207
223
          <para>
208
224
            Target directory for key files.  Default is
209
 
            <filename>/etc/mandos</filename>.
 
225
            <filename class="directory">/etc/mandos</filename>.
210
226
          </para>
211
227
        </listitem>
212
228
      </varlistentry>
213
 
 
 
229
      
214
230
      <varlistentry>
215
231
        <term><option>--type
216
232
        <replaceable>TYPE</replaceable></option></term>
218
234
        <replaceable>TYPE</replaceable></option></term>
219
235
        <listitem>
220
236
          <para>
221
 
            Key type.  Default is <quote>DSA</quote>.
 
237
            Key type.  Default is <quote>RSA</quote>.
222
238
          </para>
223
239
        </listitem>
224
240
      </varlistentry>
225
 
 
 
241
      
226
242
      <varlistentry>
227
243
        <term><option>--length
228
244
        <replaceable>BITS</replaceable></option></term>
230
246
        <replaceable>BITS</replaceable></option></term>
231
247
        <listitem>
232
248
          <para>
233
 
            Key length in bits.  Default is 2048.
 
249
            Key length in bits.  Default is 4096.
234
250
          </para>
235
251
        </listitem>
236
252
      </varlistentry>
237
 
 
 
253
      
238
254
      <varlistentry>
239
255
        <term><option>--subtype
240
256
        <replaceable>KEYTYPE</replaceable></option></term>
242
258
        <replaceable>KEYTYPE</replaceable></option></term>
243
259
        <listitem>
244
260
          <para>
245
 
            Subkey type.  Default is <quote>ELG-E</quote> (Elgamal
 
261
            Subkey type.  Default is <quote>RSA</quote> (Elgamal
246
262
            encryption-only).
247
263
          </para>
248
264
        </listitem>
249
265
      </varlistentry>
250
 
 
 
266
      
251
267
      <varlistentry>
252
268
        <term><option>--sublength
253
269
        <replaceable>BITS</replaceable></option></term>
255
271
        <replaceable>BITS</replaceable></option></term>
256
272
        <listitem>
257
273
          <para>
258
 
            Subkey length in bits.  Default is 2048.
 
274
            Subkey length in bits.  Default is 4096.
259
275
          </para>
260
276
        </listitem>
261
277
      </varlistentry>
262
 
 
 
278
      
263
279
      <varlistentry>
264
280
        <term><option>--email
265
281
        <replaceable>ADDRESS</replaceable></option></term>
271
287
          </para>
272
288
        </listitem>
273
289
      </varlistentry>
274
 
 
 
290
      
275
291
      <varlistentry>
276
292
        <term><option>--comment
277
293
        <replaceable>TEXT</replaceable></option></term>
279
295
        <replaceable>TEXT</replaceable></option></term>
280
296
        <listitem>
281
297
          <para>
282
 
            Comment field for key.  The default value is
283
 
            <quote><literal>Mandos client key</literal></quote>.
 
298
            Comment field for key.  Default is empty.
284
299
          </para>
285
300
        </listitem>
286
301
      </varlistentry>
287
 
 
 
302
      
288
303
      <varlistentry>
289
304
        <term><option>--expire
290
305
        <replaceable>TIME</replaceable></option></term>
298
313
          </para>
299
314
        </listitem>
300
315
      </varlistentry>
301
 
 
 
316
      
302
317
      <varlistentry>
303
318
        <term><option>--force</option></term>
304
319
        <term><option>-f</option></term>
326
341
          </para>
327
342
        </listitem>
328
343
      </varlistentry>
 
344
      <varlistentry>
 
345
        <term><option>--passfile
 
346
        <replaceable>FILE</replaceable></option></term>
 
347
        <term><option>-F
 
348
        <replaceable>FILE</replaceable></option></term>
 
349
        <listitem>
 
350
          <para>
 
351
            The same as <option>--password</option>, but read from
 
352
            <replaceable>FILE</replaceable>, not the terminal.
 
353
          </para>
 
354
        </listitem>
 
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>
329
372
    </variablelist>
330
373
  </refsect1>
331
 
 
 
374
  
332
375
  <refsect1 id="overview">
333
376
    <title>OVERVIEW</title>
334
377
    <xi:include href="overview.xml"/>
338
381
      <filename>clients.conf</filename> on the server.
339
382
    </para>
340
383
  </refsect1>
341
 
 
 
384
  
342
385
  <refsect1 id="exit_status">
343
386
    <title>EXIT STATUS</title>
344
387
    <para>
364
407
    </variablelist>
365
408
  </refsect1>
366
409
  
367
 
  <refsect1 id="file">
 
410
  <refsect1 id="files">
368
411
    <title>FILES</title>
369
412
    <para>
370
413
      Use the <option>--dir</option> option to change where
391
434
        </listitem>
392
435
      </varlistentry>
393
436
      <varlistentry>
394
 
        <term><filename>/tmp</filename></term>
 
437
        <term><filename class="directory">/tmp</filename></term>
395
438
        <listitem>
396
439
          <para>
397
440
            Temporary files will be written here if
401
444
      </varlistentry>
402
445
    </variablelist>
403
446
  </refsect1>
404
 
 
 
447
  
405
448
<!--   <refsect1 id="bugs"> -->
406
449
<!--     <title>BUGS</title> -->
407
450
<!--     <para> -->
408
451
<!--     </para> -->
409
452
<!--   </refsect1> -->
410
 
 
 
453
  
411
454
  <refsect1 id="example">
412
455
    <title>EXAMPLE</title>
413
456
    <informalexample>
432
475
    </informalexample>
433
476
    <informalexample>
434
477
      <para>
435
 
        Prompt for a password, encrypt it with the key in
436
 
        <filename>/etc/mandos</filename> and output a section suitable
437
 
        for <filename>clients.conf</filename>.
 
478
        Prompt for a password, encrypt it with the key in <filename
 
479
        class="directory">/etc/mandos</filename> and output a section
 
480
        suitable for <filename>clients.conf</filename>.
438
481
      </para>
439
482
      <para>
440
483
        <userinput>&COMMANDNAME; --password</userinput>
454
497
      </para>
455
498
    </informalexample>
456
499
  </refsect1>
457
 
 
 
500
  
458
501
  <refsect1 id="security">
459
502
    <title>SECURITY</title>
460
503
    <para>
469
512
      <manvolnum>8</manvolnum></citerefentry>.
470
513
    </para>
471
514
  </refsect1>
472
 
 
 
515
  
473
516
  <refsect1 id="see_also">
474
517
    <title>SEE ALSO</title>
475
518
    <para>
 
519
      <citerefentry><refentrytitle>intro</refentrytitle>
 
520
      <manvolnum>8mandos</manvolnum></citerefentry>,
476
521
      <citerefentry><refentrytitle>gpg</refentrytitle>
477
522
      <manvolnum>1</manvolnum></citerefentry>,
478
523
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
479
524
      <manvolnum>5</manvolnum></citerefentry>,
480
525
      <citerefentry><refentrytitle>mandos</refentrytitle>
481
526
      <manvolnum>8</manvolnum></citerefentry>,
482
 
      <citerefentry><refentrytitle>password-request</refentrytitle>
483
 
      <manvolnum>8mandos</manvolnum></citerefentry>
 
527
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
 
528
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
529
      <citerefentry><refentrytitle>ssh-keyscan</refentrytitle>
 
530
      <manvolnum>1</manvolnum></citerefentry>
484
531
    </para>
485
532
  </refsect1>
486
533