-{ pkgs, lib, config, host, ... }:
+{ config, host, ... }:
let
inherit (config.services) unbound;
inherit (config.users) users;
- stateDir = "/var/lib/unbound";
in
{
-networking.resolvconf.useLocalResolver = true;
-# Avoid: warning: so-rcvbuf 1048576 was not granted. Got 425984.
-# To fix: start with root permissions(linux)
-# or sysctl bigger net.core.rmem_max(linux)
-# or kern.ipc.maxsockbuf(bsd) values.
-boot.kernel.sysctl."net.core.rmem_max" = 1048576;
-services.unbound = {
- enable = true;
- # DOC: https://calomel.org/unbound_dns.html
- settings = {
- remote-control = {
- control-enable = true;
- control-interface = "/run/unbound/unbound.socket";
+ networking.resolvconf.useLocalResolver = true;
+ # Avoid: warning: so-rcvbuf 1048576 was not granted. Got 425984.
+ # To fix: start with root permissions(linux)
+ # or sysctl bigger net.core.rmem_max(linux)
+ # or kern.ipc.maxsockbuf(bsd) values.
+ boot.kernel.sysctl."net.core.rmem_max" = 1048576;
+ services.unbound = {
+ enable = true;
+ # DOC: https://calomel.org/unbound_dns.html
+ settings = {
+ remote-control = {
+ control-enable = true;
+ control-interface = "/run/unbound/unbound.socket";
+ };
+ server = {
+ log-queries = false;
+ verbosity = 1;
+ interface = [
+ "127.0.0.1"
+ "::1"
+ ];
+ access-control = [
+ "0.0.0.0/0 refuse"
+ "::0/0 refuse"
+ "127.0.0.0/8 allow"
+ "::1 allow"
+ ];
+ prefer-ip4 = !config.networking.enableIPv6;
+ port = 53;
+
+ # The file which contains the listing of primary root DNS servers.
+ # To be updated once every six months.
+ root-hints = "/var/lib/unbound/named.root";
+
+ # Do no answer id.server and hostname.bind queries.
+ hide-identity = true;
+ # Do not answer version.server and version.bind queries.
+ hide-version = true;
+
+ # Will trust glue only if it is within the servers authority.
+ # Harden against out of zone rrsets, to avoid spoofing attempts.
+ # Hardening queries multiple name servers for the same data to make
+ # spoofing significantly harder and does not mandate dnssec.
+ harden-glue = true;
+
+ # Require DNSSEC data for trust-anchored zones, if such data is absent, the
+ # zone becomes bogus. Harden against receiving dnssec-stripped data. If you
+ # turn it off, failing to validate dnskey data for a trustanchor will trigger
+ # insecure mode for that zone (like without a trustanchor). Default on,
+ # which insists on dnssec data for trust-anchored zones.
+ harden-dnssec-stripped = true;
+
+ # Use 0x20-encoded random bits in the query to foil spoof attempts.
+ # http://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00
+ #
+ # When Unbound sends a query to a remote server it sends the hostname
+ # string in random upper and lower characters. The remote server must
+ # resolve the hostname as if all the characters were lower case. The remote
+ # server must then send the query back to Unbound in the same random upper
+ # and lower characters that Unbound sent. If the characters of the hostname
+ # in the response are in the same format as the query then the dns-0x20
+ # check is satisfied.
+ # Attackers hoping to poison a Unbound DNS cache must therefore guess the
+ # mixed-case encoding of the query and the timing of the return dns answer
+ # in addition to all other fields required in a DNS poisoning attack.
+ # dns-0x20 increases the difficulty of the attack significantly.
+ #
+ # It may result in maybe 0.4% of domains getting no answers
+ # due to no support on the authoritative server side
+ use-caps-for-id = true;
+
+ #cache-min-ttl = 3600;
+ cache-max-ttl = 86400;
+
+ # Perform prefetching of close to expired message cache entries. If a client
+ # requests the dns lookup and the TTL of the cached hostname is going to
+ # expire in less than 10% of its TTL, unbound will (1st) return the IP of the
+ # host to the client and (2nd) pre-fetch the DNS request from the remote DNS server.
+ # This method has been shown to increase the amount of cached hits by
+ # local clients by 10% on average.
+ prefetch = true;
+
+ # Number of threads to create. 1 disables threading.
+ # This should equal the number of CPU cores in the host.
+ num-threads = host.CPUs;
+
+ # The number of slabs to use for cache and must be a power of 2 times the
+ # number of num-threads set above. more slabs reduce lock contention,
+ # but fragment memory usage.
+ msg-cache-slabs = 8;
+ rrset-cache-slabs = 8;
+ infra-cache-slabs = 8;
+ key-cache-slabs = 8;
+
+ # Increase the memory size of the cache. Use roughly twice as much rrset cache
+ # memory as you use msg cache memory. Due to malloc overhead, the total memory
+ # usage is likely to rise to double (or 2.5x) the total cache memory.
+ rrset-cache-size = "32m";
+ msg-cache-size = "16m";
+
+ # buffer size for UDP port 53 incoming (SO_RCVBUF socket option). This sets
+ # the kernel buffer larger so that no messages are lost in spikes in the traffic.
+ so-rcvbuf = "1m";
+
+ # Enforce privacy of these addresses. Strips them away from answers.
+ # It may cause DNSSEC validation to additionally mark it as bogus.
+ # Protects against 'DNS Rebinding' (uses browser as network proxy).
+ # Only 'private-domain' and 'local-data' names are allowed
+ # to have these private addresses. No default.
+ private-address = [
+ "192.168.0.0/16"
+ "172.16.0.0/12"
+ "10.0.0.0/8"
+ ];
+
+ # Allow the domain (and its subdomains) to contain private addresses.
+ # local-data statements are allowed to contain private addresses too.
+ #private-domain = "home.lan";
+
+ # If nonzero, unwanted replies are not only reported in statistics, but also
+ # a running total is kept per thread. If it reaches the threshold, a warning
+ # is printed and a defensive action is taken, the cache is cleared to flush
+ # potential poison out of it. A suggested value is 10000000, the default is
+ # 0 (turned off). calomel.org thinks 10K is a good value.
+ unwanted-reply-threshold = 10000;
+
+ # IMPORTANT FOR TESTING: If you are testing and setup NSD or BIND on
+ # localhost you will want to allow the resolver to send queries to localhost.
+ # Make sure to set do-not-query-localhost = true;.
+ do-not-query-localhost = true;
+
+ # Should additional section of secure message also be kept clean of unsecure
+ # data. Useful to shield the users of this validator from potential bogus
+ # data in the additional section. All unsigned data in the additional section
+ # is removed from secure messages.
+ val-clean-additional = true;
+ };
};
- server = {
- log-queries = false;
- verbosity = 1;
- interface = [ "127.0.0.1" "::1" ];
- prefer-ip4 = !config.networking.enableIPv6;
- port = 53;
-
- # The file which contains the listing of primary root DNS servers.
- # To be updated once every six months.
- root-hints = "/var/lib/unbound/named.root";
-
- # Do no answer id.server and hostname.bind queries.
- hide-identity = true;
- # Do not answer version.server and version.bind queries.
- hide-version = true;
-
- # Will trust glue only if it is within the servers authority.
- # Harden against out of zone rrsets, to avoid spoofing attempts.
- # Hardening queries multiple name servers for the same data to make
- # spoofing significantly harder and does not mandate dnssec.
- harden-glue = true;
-
- # Require DNSSEC data for trust-anchored zones, if such data is absent, the
- # zone becomes bogus. Harden against receiving dnssec-stripped data. If you
- # turn it off, failing to validate dnskey data for a trustanchor will trigger
- # insecure mode for that zone (like without a trustanchor). Default on,
- # which insists on dnssec data for trust-anchored zones.
- harden-dnssec-stripped = true;
-
- # Use 0x20-encoded random bits in the query to foil spoof attempts.
- # http://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00
- #
- # When Unbound sends a query to a remote server it sends the hostname
- # string in random upper and lower characters. The remote server must
- # resolve the hostname as if all the characters were lower case. The remote
- # server must then send the query back to Unbound in the same random upper
- # and lower characters that Unbound sent. If the characters of the hostname
- # in the response are in the same format as the query then the dns-0x20
- # check is satisfied.
- # Attackers hoping to poison a Unbound DNS cache must therefore guess the
- # mixed-case encoding of the query and the timing of the return dns answer
- # in addition to all other fields required in a DNS poisoning attack.
- # dns-0x20 increases the difficulty of the attack significantly.
- #
- # It may result in maybe 0.4% of domains getting no answers
- # due to no support on the authoritative server side
- use-caps-for-id = true;
-
- #cache-min-ttl = 3600;
- cache-max-ttl = 86400;
-
- # Perform prefetching of close to expired message cache entries. If a client
- # requests the dns lookup and the TTL of the cached hostname is going to
- # expire in less than 10% of its TTL, unbound will (1st) return the IP of the
- # host to the client and (2nd) pre-fetch the DNS request from the remote DNS server.
- # This method has been shown to increase the amount of cached hits by
- # local clients by 10% on average.
- prefetch = true;
-
- # Number of threads to create. 1 disables threading.
- # This should equal the number of CPU cores in the host.
- num-threads = host.CPUs;
-
- # The number of slabs to use for cache and must be a power of 2 times the
- # number of num-threads set above. more slabs reduce lock contention,
- # but fragment memory usage.
- msg-cache-slabs = 8;
- rrset-cache-slabs = 8;
- infra-cache-slabs = 8;
- key-cache-slabs = 8;
-
- # Increase the memory size of the cache. Use roughly twice as much rrset cache
- # memory as you use msg cache memory. Due to malloc overhead, the total memory
- # usage is likely to rise to double (or 2.5x) the total cache memory.
- rrset-cache-size = "32m";
- msg-cache-size = "16m";
-
- # buffer size for UDP port 53 incoming (SO_RCVBUF socket option). This sets
- # the kernel buffer larger so that no messages are lost in spikes in the traffic.
- so-rcvbuf = "1m";
-
- # Enforce privacy of these addresses. Strips them away from answers.
- # It may cause DNSSEC validation to additionally mark it as bogus.
- # Protects against 'DNS Rebinding' (uses browser as network proxy).
- # Only 'private-domain' and 'local-data' names are allowed
- # to have these private addresses. No default.
- private-address = [
- "192.168.0.0/16"
- "172.16.0.0/12"
- "10.0.0.0/8"
+ };
+ networking.nftables.ruleset = ''
+ table inet filter {
+ chain output-net {
+ skuid ${users.unbound.name} \
+ meta l4proto { udp, tcp } th dport domain \
+ counter accept comment "unbound"
+ }
+ }
+ '';
+ systemd.services.unbound = {
+ serviceConfig = {
+ #RuntimeDirectoryMode = "0700";
+ BindReadOnlyPaths = [
+ "${../../networking/named.root}:/var/lib/unbound/named.root"
];
-
- # Allow the domain (and its subdomains) to contain private addresses.
- # local-data statements are allowed to contain private addresses too.
- #private-domain = "home.lan";
-
- # If nonzero, unwanted replies are not only reported in statistics, but also
- # a running total is kept per thread. If it reaches the threshold, a warning
- # is printed and a defensive action is taken, the cache is cleared to flush
- # potential poison out of it. A suggested value is 10000000, the default is
- # 0 (turned off). calomel.org thinks 10K is a good value.
- unwanted-reply-threshold = 10000;
-
- # IMPORTANT FOR TESTING: If you are testing and setup NSD or BIND on
- # localhost you will want to allow the resolver to send queries to localhost.
- # Make sure to set do-not-query-localhost = true;.
- do-not-query-localhost = true;
-
- # Should additional section of secure message also be kept clean of unsecure
- # data. Useful to shield the users of this validator from potential bogus
- # data in the additional section. All unsigned data in the additional section
- # is removed from secure messages.
- val-clean-additional = true;
};
};
-};
-networking.nftables.ruleset = ''
- add rule inet filter fw2net meta l4proto { udp, tcp } th dport 53 skuid ${users.unbound.name} counter accept comment "Unbound"
-'';
-systemd.services.unbound = {
- serviceConfig = {
- RuntimeDirectory = "unbound";
- RuntimeDirectoryMode = "0700";
- };
- preStart = ''
- install -m 444 \
- ${../../networking/named.root} \
- /var/lib/unbound/named.root
- '';
-};
}
sourcephile / git / sourcephile-nix.git / blobdiff