443 lines
13 KiB
Nix
443 lines
13 KiB
Nix
{
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lib,
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pkgs,
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config,
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nodes,
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...
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}: let
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name = "dns";
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cfg = config.services.skynet."${name}";
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# reads that date to a string (will need to be fixed in 2038)
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current_date = lib.readFile "${pkgs.runCommand "timestamp" {} "echo -n `date +%s` > $out"}";
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# gets a list of records that match this type
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filter_records_type = r_type: builtins.filter (x: x.r_type == r_type) records;
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filter_records_server = builtins.filter (x: builtins.hasAttr "server" x && x.server) (filter_records_type "A");
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filter_records_a = builtins.filter (x: builtins.hasAttr "server" x && !x.server) (filter_records_type "A");
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process_ptr = records: lib.lists.forEach records (x: process_ptr_sub x);
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process_ptr_sub = record: {
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record = builtins.substring 9 3 record.record;
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r_type = "PTR";
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value = record.value;
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};
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ip_ptr_to_int = ip: lib.strings.toInt (builtins.substring 9 3 ip);
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sort_records_server = builtins.sort (a: b: a.record < b.record) filter_records_server;
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sort_records_a = builtins.sort (a: b: (ip_ptr_to_int a.value) < (ip_ptr_to_int b.value)) filter_records_a;
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sort_records_cname = builtins.sort (a: b: a.value < b.value) (filter_records_type "CNAME");
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sort_records_ptr = builtins.sort (a: b: (lib.strings.toInt a.record) < (lib.strings.toInt b.record)) (process_ptr (filter_records_type "PTR"));
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sort_records_srv = builtins.sort (a: b: a.record < b.record) (filter_records_type "SRV");
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format_records = records: offset: lib.strings.concatMapStrings (x: "${padString x.record offset} IN ${padString x.r_type 5} ${x.value}\n") records;
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# small function to trim it down a tad
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padString = text: length: fixedWidthString_post length " " text;
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# like lib.strings.fixedWidthString but postfix
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fixedWidthString_post = width: filler: str: let
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strw = lib.stringLength str;
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reqWidth = width - (lib.stringLength filler);
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in
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assert lib.assertMsg (strw <= width) "fixedWidthString_post: requested string length (${toString width}) must not be shorter than actual length (${toString strw})";
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if strw == width
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then str
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else (fixedWidthString_post reqWidth filler str) + filler;
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# base config for domains we own (skynet.ie, csn.ul.ie, ulcompsoc.ie)
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get_config_file = (
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domain: ''
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$TTL 60 ; 1 minute
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; hostmaster@${domain} is an email address that recieves stuff related to dns
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@ IN SOA ${nameserver}.${domain}. hostmaster.${domain}. (
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; Serial (YYYYMMDDCC) this has to be updated for each time the record is updated
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${current_date}
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600 ; Refresh (10 minutes)
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300 ; Retry (5 minutes)
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604800 ; Expire (1 week)
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3600 ; Minimum (1 hour)
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)
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@ NS ns1.${domain}.
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@ NS ns2.${domain}.
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; @ stands for teh root domain so teh A record below is where ${domain} points to
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;@ A 193.1.99.76
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;@ MX 5 ${domain}.
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; can have multiple mailserves
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@ MX 10 mail.${domain}.
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; ------------------------------------------
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; Server Names (A Records)
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; ------------------------------------------
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${format_records sort_records_server 31}
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; ------------------------------------------
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; A (non server names
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; ------------------------------------------
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${format_records sort_records_a 31}
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; ------------------------------------------
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; CNAMES
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; ------------------------------------------
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${format_records sort_records_cname 31}
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; ------------------------------------------
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; TXT
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; ------------------------------------------
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${format_records (filter_records_type "TXT") 31}
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; ------------------------------------------
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; MX
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; ------------------------------------------
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${format_records (filter_records_type "MX") 31}
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; ------------------------------------------
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; SRV
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; ------------------------------------------
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${format_records sort_records_srv 65}
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''
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);
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# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/reference_guide/s2-bind-configuration-zone-reverse
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# config for our reverse dnspointers (not properly working)
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get_config_file_rev = (
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domain: ''
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$ORIGIN 64-64.99.1.193.in-addr.arpa.
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$TTL 60 ; 1 minute
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; hostmaster@skynet.ie is an email address that recieves stuff related to dns
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@ IN SOA ${nameserver}.skynet.ie. hostmaster.skynet.ie. (
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; Serial (YYYYMMDDCC) this has to be updated for each time the record is updated
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${current_date}
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600 ; Refresh (10 minutes)
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300 ; Retry (5 minutes)
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604800 ; Expire (1 week)
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3600 ; Minimum (1 hour)
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)
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@ NS ns1.skynet.ie.
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@ NS ns2.skynet.ie.
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; ------------------------------------------
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; PTR
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; ------------------------------------------
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${format_records sort_records_ptr 3}
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''
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);
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# domains we dont have proper ownship over, only here to ensure the logs dont get cluttered.
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get_config_file_old_domains = (
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domain: ''
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$TTL 60 ; 1 minute
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; hostmaster@skynet.ie is an email address that recieves stuff related to dns
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@ IN SOA ${nameserver}.skynet.ie. hostmaster.skynet.ie. (
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; Serial (YYYYMMDDCC) this has to be updated for each time the record is updated
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${current_date}
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600 ; Refresh (10 minutes)
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300 ; Retry (5 minutes)
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604800 ; Expire (1 week)
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3600 ; Minimum (1 hour)
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)
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@ NS ns1.skynet.ie.
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@ NS ns2.skynet.ie.
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''
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);
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# arrys of teh two nameservers
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tmp1 = ["193.1.99.109"];
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tmp2 = ["193.1.99.120"];
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primaries = (
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if cfg.server.primary
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then
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# primary servers have no primaries (ones they listen to)
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[]
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else if builtins.elem cfg.server.ip tmp1
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then tmp2
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else tmp1
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);
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secondaries = (
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if cfg.server.primary
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then
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if builtins.elem cfg.server.ip tmp1
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then tmp2
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else tmp1
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else []
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);
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# small function to tidy up the spam of the cache networks, would use teh subnet except all external traffic has the ip of teh router
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create_cache_networks = map (x: "193.1.99.${toString x}/32") (lib.lists.range 71 126);
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# standard function to create the etc file, pass in the text and domain and it makes it
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create_entry_etc_sub = domain: text: {
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# Creates /etc/skynet/dns/domain
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"skynet/dns/${domain}" = {
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user = "named";
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group = "named";
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# The UNIX file mode bits
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mode = "0664";
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text = text;
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};
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};
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# (text.owned "csn.ul.ie")
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# standard function to create the etc file, pass in the text and domain and it makes it
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create_entry_etc = domain: type:
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if type == "owned"
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then create_entry_etc_sub domain (text.owned domain)
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else if type == "reverse"
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then create_entry_etc_sub domain (text.reverse domain)
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else if type == "old"
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then create_entry_etc_sub domain (text.old domain)
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else {};
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create_entry_zone = domain: extraConfig: {
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"${domain}" = {
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extraConfig = ''
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${extraConfig}
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// for bumping the config
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// ${current_date}
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'';
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# really wish teh nixos config didnt use master/slave
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master = cfg.server.primary;
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masters = primaries;
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slaves = secondaries;
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# need to write this to a file
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# using the date in it so it will trigger a restart
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file = "/etc/skynet/dns/${domain}";
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# no leading whitespace for first line
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};
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};
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text = {
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owned = domain: get_config_file domain;
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reverse = domain: get_config_file_rev domain;
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old = domain: get_config_file_old_domains domain;
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};
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extraConfig = {
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owned =
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if cfg.server.primary
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then ''
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allow-update { key rfc2136key.skynet.ie.; };
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dnssec-policy default;
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inline-signing yes;
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''
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else "";
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# no extra config for reverse
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reverse = "";
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old = "";
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};
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records =
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config.skynet.records
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++ builtins.concatLists (
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lib.attrsets.mapAttrsToList (
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key: value: let
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details_server = value.config.services.skynet."${name}".server;
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details_records = value.config.services.skynet."${name}".records;
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in
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if builtins.hasAttr "dns" value.config.services.skynet
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then
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(
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# got to handle habing a dns record for the dns serves themselves.
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if details_server.enable
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then
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(
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if details_server.primary
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then
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details_records
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++ [
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{
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record = "ns1";
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r_type = "A";
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value = details_server.ip;
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server = false;
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}
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]
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else
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details_records
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++ [
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{
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record = "ns2";
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r_type = "A";
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value = details_server.ip;
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server = false;
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}
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]
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)
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else details_records
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)
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else []
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)
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nodes
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);
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nameserver =
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if cfg.server.primary
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then "ns1"
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else "ns2";
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in {
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imports = [
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./firewall.nix
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../config/dns.nix
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];
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options.services.skynet."${name}" = {
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server = {
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enable = lib.mkEnableOption {
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default = false;
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description = "Skynet DNS server";
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type = lib.types.bool;
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};
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primary = lib.mkOption {
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type = lib.types.bool;
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default = false;
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};
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ip = lib.mkOption {
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type = lib.types.str;
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description = ''
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ip of this server
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'';
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};
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};
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records = lib.mkOption {
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description = "Records, sorted based on therir type";
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type = lib.types.listOf (lib.types.submodule (import ./dns/options-records.nix {
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inherit lib;
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}));
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};
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};
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config = lib.mkIf cfg.server.enable {
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# logging
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services.prometheus.exporters.bind = {
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enable = true;
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openFirewall = true;
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};
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# services.skynet.backup.normal.backups = ["/etc/skynet/dns"];
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# open the firewall for this
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skynet_firewall.forward = [
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"ip daddr ${cfg.server.ip} tcp dport 53 counter packets 0 bytes 0 accept"
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"ip daddr ${cfg.server.ip} udp dport 53 counter packets 0 bytes 0 accept"
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];
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services.bind.zones =
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(create_entry_zone "csn.ul.ie" extraConfig.owned)
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// (create_entry_zone "skynet.ie" extraConfig.owned)
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// (create_entry_zone "ulcompsoc.ie" extraConfig.owned)
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// (create_entry_zone "64-64.99.1.193.in-addr.arpa" extraConfig.reverse)
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// (create_entry_zone "conradcollins.net" extraConfig.old)
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// (create_entry_zone "edelharty.net" extraConfig.old);
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environment.etc =
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(create_entry_etc "csn.ul.ie" "owned")
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// (create_entry_etc "skynet.ie" "owned")
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// (create_entry_etc "ulcompsoc.ie" "owned")
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// (create_entry_etc "64-64.99.1.193.in-addr.arpa" "reverse")
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// (create_entry_etc "conradcollins.net" "old")
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// (create_entry_etc "edelharty.net" "old");
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# secrets required
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age.secrets.dns_dnskeys = {
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file = ../secrets/dns_dnskeys.conf.age;
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owner = "named";
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group = "named";
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};
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networking.firewall = {
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allowedTCPPorts = [53];
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allowedUDPPorts = [53];
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};
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services.bind = {
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enable = true;
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ipv4Only = true;
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# need to take a look at https://nixos.org/manual/nixos/unstable/#module-security-acme-config-dns
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extraConfig = ''
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include "/run/agenix/dns_dnskeys";
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statistics-channels {
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inet 127.0.0.1 port 8053 allow { 127.0.0.1; };
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};
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'';
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# piles of no valid RRSIG resolving 'com/DS/IN' errors
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extraOptions = ''
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dnssec-validation yes;
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'';
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# set the upstream dns servers
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# overrides the default dns servers
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forwarders = [
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# Cloudflare
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"1.1.1.1"
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# Google
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"8.8.8.8"
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# Quad9
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"9.9.9.9"
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];
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cacheNetworks =
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[
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# this server itself
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"127.0.0.0/24"
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# skynet server in the dmz
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"193.1.96.165/32"
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# all of skynet can use this as a resolver
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/*
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Origianl idea, however all external traffic had the ip of the router
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"193.1.99.64/26"
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So to fix this we need to allow smaller ranges? - Didnt work
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Fallback is explisitly listing each ip we have
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Now have a function for it
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*/
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]
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++ create_cache_networks;
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};
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systemd.services.bind = {
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# deletes teh journal files evey start so it no longer stalls out
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preStart = ''
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rm -vf /etc/skynet/dns/*.jnl
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rm -vf /etc/skynet/dns/*.jbk
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'';
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restartTriggers = [
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"${config.environment.etc."skynet/dns/skynet.ie".source}"
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];
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};
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# creates a folder in /etc for the dns to use
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users.groups.named = {};
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users.users.named = {
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createHome = true;
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home = "/etc/skynet/dns";
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group = "named";
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# X11 is to ensure the directory can be traversed
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homeMode = "711";
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};
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};
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}
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