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nixos/resolved: clean up option descriptions

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Also change LLMNR RFC to the correct id 4795.
This commit is contained in:
Robert Helgesson 2017-10-16 14:30:36 +02:00
parent b59013249e
commit c4088dd0af
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1 changed files with 63 additions and 9 deletions
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72
nixos/modules/system/boot/resolved.nix
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@ -31,8 +31,15 @@ in
example = [ "example.com" ];
type = types.listOf types.str;
description = ''
A list of domains. These domains are used as search suffixes when resolving single-label host names (domain names which contain no dot), in order to qualify them into fully-qualified domain names (FQDNs).
For compatibility reasons, if this setting is not specified, the search domains listed in /etc/resolv.conf are used instead, if that file exists and any domains are configured in it.
A list of domains. These domains are used as search suffixes
when resolving single-label host names (domain names which
contain no dot), in order to qualify them into fully-qualified
domain names (FQDNs).
</para><para>
For compatibility reasons, if this setting is not specified,
the search domains listed in
<filename>/etc/resolv.conf</filename> are used instead, if
that file exists and any domains are configured in it.
'';
};
@ -41,10 +48,30 @@ in
example = "false";
type = types.enum [ "true" "resolve" "false" ];
description = ''
Controls Link-Local Multicast Name Resolution support (RFC 4794) on the local host.
If true, enables full LLMNR responder and resolver support.
If false, disables both.
If set to "resolve", only resolution support is enabled, but responding is disabled.
Controls Link-Local Multicast Name Resolution support
(RFC 4795) on the local host.
</para><para>
If set to
<variablelist>
<varlistentry>
<term><literal>"true"</literal></term>
<listitem><para>
Enables full LLMNR responder and resolver support.
</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>"false"</literal></term>
<listitem><para>
Disables both.
</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>"resolve"</literal></term>
<listitem><para>
Only resolution support is enabled, but responding is disabled.
</para></listitem>
</varlistentry>
</variablelist>
'';
};
@ -53,9 +80,36 @@ in
example = "true";
type = types.enum [ "true" "allow-downgrade" "false" ];
description = ''
If true all DNS lookups are DNSSEC-validated locally (excluding LLMNR and Multicast DNS). Note that this mode requires a DNS server that supports DNSSEC. If the DNS server does not properly support DNSSEC all validations will fail.
If set to "allow-downgrade" DNSSEC validation is attempted, but if the server does not support DNSSEC properly, DNSSEC mode is automatically disabled. Note that this mode makes DNSSEC validation vulnerable to "downgrade" attacks, where an attacker might be able to trigger a downgrade to non-DNSSEC mode by synthesizing a DNS response that suggests DNSSEC was not supported.
If set to false, DNS lookups are not DNSSEC validated.
If set to
<variablelist>
<varlistentry>
<term><literal>"true"</literal></term>
<listitem><para>
all DNS lookups are DNSSEC-validated locally (excluding
LLMNR and Multicast DNS). Note that this mode requires a
DNS server that supports DNSSEC. If the DNS server does
not properly support DNSSEC all validations will fail.
</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>"allow-downgrade"</literal></term>
<listitem><para>
DNSSEC validation is attempted, but if the server does not
support DNSSEC properly, DNSSEC mode is automatically
disabled. Note that this mode makes DNSSEC validation
vulnerable to "downgrade" attacks, where an attacker might
be able to trigger a downgrade to non-DNSSEC mode by
synthesizing a DNS response that suggests DNSSEC was not
supported.
</para></listitem>
</varlistentry>
<varlistentry>
<term><literal>"false"</literal></term>
<listitem><para>
DNS lookups are not DNSSEC validated.
</para></listitem>
</varlistentry>
</variablelist>
'';
};