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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:52:09 UTC
  • mto: (237.7.304 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • Revision ID: teddy@recompile.se-20150310185209-lxuovbu09zwyk9bx
Automatically determine the number of DH bits in the TLS handshake.

Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this).  Document this new default behavior.

* plugins.d/mandos-client.c (safe_string): New function.
  (init_gnutls_global): If not specified, determine the number of DH
                        bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
                                         the --dh-bits option.

Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.

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mandos-options.xml
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    <emphasis>not</emphasis> run in debug mode.
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  </para>
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  <para id="priority_compat">
 
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    GnuTLS priority string for the <acronym>TLS</acronym> handshake.
 
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    The default is <quote><literal
 
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    >SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA</literal>
 
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    <literal>:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160</literal></quote>.
 
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    See <citerefentry><refentrytitle
 
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    >gnutls_priority_init</refentrytitle>
 
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    <manvolnum>3</manvolnum></citerefentry> for the syntax.
 
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    <emphasis>Warning</emphasis>: changing this may make the
 
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    <acronym>TLS</acronym> handshake fail, making server-client
 
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    communication impossible.  Changing this option may also make the
 
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    network traffic decryptable by an attacker.
 
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  </para>
 
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  <para id="priority">
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    GnuTLS priority string for the <acronym>TLS</acronym> handshake.
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    The default is <quote><literal
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    >SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA</literal>
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    <literal>:+SIGN-DSA-SHA256</literal></quote>.
 
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    >SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA</literal></quote>.
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    See <citerefentry><refentrytitle
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    >gnutls_priority_init</refentrytitle>
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    <manvolnum>3</manvolnum></citerefentry> for the syntax.