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nixos/dnscrypt-proxy: support updating before nss is up

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Resolve download.dnscrypt.org using hostip with a bootstrap
resolver (hard-coded to Google Public DNS for now), to ensure
that we can get an up-to-date resolver list without working name
service lookups. This makes us more robust to the upstream
resolver list getting out of date and other DNS configuration
problems.

We use the curl --resolver switch to allow https cert validation
(we'd need to do --insecure if using just the ip addr). Note
that we don't rely on https for security but it's nice to have
it ...
This commit is contained in:
Joachim Fasting 2017-03-07 23:17:01 +01:00
parent adf044e1fb
commit e72aaa73ea
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1 changed files with 7 additions and 5 deletions
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12
nixos/modules/services/networking/dnscrypt-proxy.nix
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@ -266,13 +266,15 @@ in
requires = [ "init-dnscrypt-proxy-statedir.service" ];
after = [ "init-dnscrypt-proxy-statedir.service" ];
path = with pkgs; [ curl minisign ];
path = with pkgs; [ curl dnscrypt-proxy minisign ];
script = ''
cd ${stateDirectory}
curl -fSsL -o dnscrypt-resolvers.csv.tmp \
https://download.dnscrypt.org/dnscrypt-proxy/dnscrypt-resolvers.csv
curl -fSsL -o dnscrypt-resolvers.csv.minisig.tmp \
https://download.dnscrypt.org/dnscrypt-proxy/dnscrypt-resolvers.csv.minisig
domain=download.dnscrypt.org
get="curl -fSs --resolve $domain:443:$(hostip -r 8.8.8.8 $domain | head -1)"
$get -o dnscrypt-resolvers.csv.tmp \
https://$domain/dnscrypt-proxy/dnscrypt-resolvers.csv
$get -o dnscrypt-resolvers.csv.minisig.tmp \
https://$domain/dnscrypt-proxy/dnscrypt-resolvers.csv.minisig
mv dnscrypt-resolvers.csv.minisig{.tmp,}
minisign -q -V -p ${upstreamResolverListPubKey} \
-m dnscrypt-resolvers.csv.tmp -x dnscrypt-resolvers.csv.minisig