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Allow daemon users to override ‘binary-caches’

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For security reasons, daemon users can only specify caches that appear
in the ‘binary-caches’ and ‘trusted-binary-caches’ options in
nix.conf.
This commit is contained in:
Eelco Dolstra 2012-07-31 18:56:22 -04:00
parent eb7849e3a2
commit 4d1b64f118
2 changed files with 40 additions and 3 deletions
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13
doc/manual/conf-file.xml
View file

@ -329,6 +329,19 @@ build-use-chroot = /dev /proc /bin</programlisting>
</varlistentry>
<varlistentry><term><literal>trusted-binary-caches</literal></term>
<listitem><para>A list of URLs of binary caches, separated by
whitespace. These are not used by default, but can be enabled by
users of the Nix daemon by specifying <literal>--option
binary-caches <replaceable>urls</replaceable></literal> on the
command line. Daemon users are only allowed to pass a subset of
the URLs listed in <literal>binary-caches</literal> and
<literal>trusted-binary-caches</literal>.</para></listitem>
</varlistentry>
<varlistentry><term><literal>binary-caches-parallel-connections</literal></term>
<listitem><para>The maximum number of parallel HTTP connections

28
scripts/download-from-binary-cache.pl.in
View file

@ -8,6 +8,7 @@ use Nix::Store;
use Nix::Utils;
use WWW::Curl::Easy;
use WWW::Curl::Multi;
use List::MoreUtils qw(any);
use strict;
@ -166,10 +167,33 @@ sub getAvailableCaches {
return if $gotCaches;
$gotCaches = 1;
my @urls = map { s/\/+$//; $_ } split(/ /,
$Nix::Config::config{"binary-caches"}
sub strToList {
my ($s) = @_;
return map { s/\/+$//; $_ } split(/ /, $s);
}
my @urls = strToList
($Nix::Config::config{"binary-caches"}
// ($Nix::Config::storeDir eq "/nix/store" ? "http://nixos.org/binary-cache" : ""));
# Allow Nix daemon users to override the binary caches to a subset
# of those listed in the config file. Note that ‘untrusted-*’
# denotes options passed by the client.
if (defined $Nix::Config::config{"untrusted-binary-caches"}) {
my @untrustedUrls = strToList $Nix::Config::config{"untrusted-binary-caches"};
my @trustedUrls = (@urls, strToList($Nix::Config::config{"trusted-binary-caches"} // ""));
@urls = ();
foreach my $url (@untrustedUrls) {
if (any { $url eq $_ } @trustedUrls) {
push @urls, $url;
} else {
# FIXME: should die here, but we currently can't
# deliver error messages to clients.
warn "warning: binary cache ‘$url’ is not trusted (please add it to ‘trusted-binary-caches’ in $Nix::Config::confDir/nix.conf)\n";
}
}
}
foreach my $url (@urls) {
# FIXME: not atomic.