From 1685db8913c7085b147e1895e68f7a2da2b26389 Mon Sep 17 00:00:00 2001 From: Aaron Bieber Date: Fri, 23 Aug 2024 08:25:43 -0600 Subject: [PATCH] initial --- .envrc | 1 + .gitignore | 5 + LICENSE | 15 +++ flake.lock | 26 +++++ flake.nix | 50 ++++++++ go.mod | 88 ++++++++++++++ go.sum | 242 +++++++++++++++++++++++++++++++++++++++ main.go | 172 ++++++++++++++++++++++++++++ module.nix | 84 ++++++++++++++ records.go | 63 ++++++++++ records_test.go | 68 +++++++++++ templates/templates.html | 119 +++++++++++++++++++ 12 files changed, 933 insertions(+) create mode 100644 .envrc create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 flake.lock create mode 100644 flake.nix create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 module.nix create mode 100644 records.go create mode 100644 records_test.go create mode 100644 templates/templates.html diff --git a/.envrc b/.envrc new file mode 100644 index 0000000..3550a30 --- /dev/null +++ b/.envrc @@ -0,0 +1 @@ +use flake diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..eec85be --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +.direnv +*.bak +result +tags +tsns diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..5718c90 --- /dev/null +++ b/LICENSE @@ -0,0 +1,15 @@ +/* + * Copyright (c) 2024 Aaron Bieber + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..d26d37b --- /dev/null +++ b/flake.lock @@ -0,0 +1,26 @@ +{ + "nodes": { + "nixpkgs": { + "locked": { + "lastModified": 1724224976, + "narHash": "sha256-Z/ELQhrSd7bMzTO8r7NZgi9g5emh+aRKoCdaAv5fiO0=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "c374d94f1536013ca8e92341b540eba4c22f9c62", + "type": "github" + }, + "original": { + "id": "nixpkgs", + "ref": "nixos-unstable", + "type": "indirect" + } + }, + "root": { + "inputs": { + "nixpkgs": "nixpkgs" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..837e504 --- /dev/null +++ b/flake.nix @@ -0,0 +1,50 @@ +{ + description = "tsns: self-contained name server for your tailnet"; + + inputs.nixpkgs.url = "nixpkgs/nixos-unstable"; + + outputs = + { self + , nixpkgs + , + }: + let + supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ]; + forAllSystems = nixpkgs.lib.genAttrs supportedSystems; + nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; }); + in + { + overlay = _: prev: { inherit (self.packages.${prev.system}) tsns; }; + + packages = forAllSystems (system: + let + pkgs = nixpkgsFor.${system}; + in + { + tsns = pkgs.buildGoModule { + pname = "tsns"; + version = "v0.0.0"; + src = ./.; + + vendorHash = "sha256-qhzjJfLurlxmWVrmmH7LIPMNNQk6sS/jWptdi6ga9Rk="; + }; + }); + + defaultPackage = forAllSystems (system: self.packages.${system}.tsns); + nixosModule.default = import ./module.nix; + devShells = forAllSystems (system: + let + pkgs = nixpkgsFor.${system}; + in + { + default = pkgs.mkShell { + shellHook = '' + PS1='\u@\h:\@; ' + nix run github:qbit/xin#flake-warn + echo "Go `${pkgs.go}/bin/go version`" + ''; + nativeBuildInputs = with pkgs; [ git go gopls go-tools ]; + }; + }); + }; +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..0934b5b --- /dev/null +++ b/go.mod @@ -0,0 +1,88 @@ +module suah.dev/tsns + +go 1.22.5 + +require tailscale.com v1.72.1 + +require ( + filippo.io/edwards25519 v1.1.0 // indirect + github.com/akutz/memconn v0.1.0 // indirect + github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa // indirect + github.com/aws/aws-sdk-go-v2 v1.24.1 // indirect + github.com/aws/aws-sdk-go-v2/config v1.26.5 // indirect + github.com/aws/aws-sdk-go-v2/credentials v1.16.16 // indirect + github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.14.11 // indirect + github.com/aws/aws-sdk-go-v2/internal/configsources v1.2.10 // indirect + github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.5.10 // indirect + github.com/aws/aws-sdk-go-v2/internal/ini v1.7.2 // indirect + github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.10.4 // indirect + github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.10.10 // indirect + github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7 // indirect + github.com/aws/aws-sdk-go-v2/service/sso v1.18.7 // indirect + github.com/aws/aws-sdk-go-v2/service/ssooidc v1.21.7 // indirect + github.com/aws/aws-sdk-go-v2/service/sts v1.26.7 // indirect + github.com/aws/smithy-go v1.19.0 // indirect + github.com/bits-and-blooms/bitset v1.13.0 // indirect + github.com/coder/websocket v1.8.12 // indirect + github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6 // indirect + github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect + github.com/digitalocean/go-smbios v0.0.0-20180907143718-390a4f403a8e // indirect + github.com/fxamacker/cbor/v2 v2.6.0 // indirect + github.com/gaissmai/bart v0.11.1 // indirect + github.com/go-json-experiment/json v0.0.0-20231102232822-2e55bd4e08b0 // indirect + github.com/go-ole/go-ole v1.3.0 // indirect + github.com/godbus/dbus/v5 v5.1.1-0.20230522191255-76236955d466 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/google/btree v1.1.2 // indirect + github.com/google/go-cmp v0.6.0 // indirect + github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/gorilla/csrf v1.7.2 // indirect + github.com/gorilla/securecookie v1.1.2 // indirect + github.com/hdevalence/ed25519consensus v0.2.0 // indirect + github.com/illarion/gonotify v1.0.1 // indirect + github.com/insomniacslk/dhcp v0.0.0-20231206064809-8c70d406f6d2 // indirect + github.com/jmespath/go-jmespath v0.4.0 // indirect + github.com/josharian/native v1.1.1-0.20230202152459-5c7d0dd6ab86 // indirect + github.com/jsimonetti/rtnetlink v1.4.0 // indirect + github.com/klauspost/compress v1.17.4 // indirect + github.com/kortschak/wol v0.0.0-20200729010619-da482cc4850a // indirect + github.com/mdlayher/genetlink v1.3.2 // indirect + github.com/mdlayher/netlink v1.7.2 // indirect + github.com/mdlayher/sdnotify v1.0.0 // indirect + github.com/mdlayher/socket v0.5.0 // indirect + github.com/miekg/dns v1.1.58 // indirect + github.com/mitchellh/go-ps v1.0.0 // indirect + github.com/pierrec/lz4/v4 v4.1.21 // indirect + github.com/prometheus-community/pro-bing v0.4.0 // indirect + github.com/safchain/ethtool v0.3.0 // indirect + github.com/tailscale/certstore v0.1.1-0.20231202035212-d3fa0460f47e // indirect + github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect + github.com/tailscale/golang-x-crypto v0.0.0-20240604161659-3fde5e568aa4 // indirect + github.com/tailscale/goupnp v1.0.1-0.20210804011211-c64d0f06ea05 // indirect + github.com/tailscale/hujson v0.0.0-20221223112325-20486734a56a // indirect + github.com/tailscale/netlink v1.1.1-0.20211101221916-cabfb018fe85 // indirect + github.com/tailscale/peercred v0.0.0-20240214030740-b535050b2aa4 // indirect + github.com/tailscale/web-client-prebuilt v0.0.0-20240226180453-5db17b287bf1 // indirect + github.com/tailscale/wireguard-go v0.0.0-20240731203015-71393c576b98 // indirect + github.com/tcnksm/go-httpstat v0.2.0 // indirect + github.com/u-root/uio v0.0.0-20240118234441-a3c409a6018e // indirect + github.com/vishvananda/netlink v1.2.1-beta.2 // indirect + github.com/vishvananda/netns v0.0.4 // indirect + github.com/x448/float16 v0.8.4 // indirect + go4.org/mem v0.0.0-20220726221520-4f986261bf13 // indirect + go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect + golang.org/x/crypto v0.25.0 // indirect + golang.org/x/exp v0.0.0-20240119083558-1b970713d09a // indirect + golang.org/x/mod v0.19.0 // indirect + golang.org/x/net v0.27.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.22.0 // indirect + golang.org/x/term v0.22.0 // indirect + golang.org/x/text v0.16.0 // indirect + golang.org/x/time v0.5.0 // indirect + golang.org/x/tools v0.23.0 // indirect + golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect + golang.zx2c4.com/wireguard/windows v0.5.3 // indirect + gvisor.dev/gvisor v0.0.0-20240722211153-64c016c92987 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..b74b761 --- /dev/null +++ b/go.sum @@ -0,0 +1,242 @@ +filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA= +filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4= +filippo.io/mkcert v1.4.4 h1:8eVbbwfVlaqUM7OwuftKc2nuYOoTDQWqsoXmzoXZdbc= +filippo.io/mkcert v1.4.4/go.mod h1:VyvOchVuAye3BoUsPUOOofKygVwLV2KQMVFJNRq+1dA= +github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8= +github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ= +github.com/akutz/memconn v0.1.0 h1:NawI0TORU4hcOMsMr11g7vwlCdkYeLKXBcxWu2W/P8A= 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+software.sslmate.com/src/go-pkcs12 v0.4.0/go.mod h1:Qiz0EyvDRJjjxGyUQa2cCNZn/wMyzrRJ/qcDXOQazLI= +tailscale.com v1.72.1 h1:hk82jek36ph2S3Tfsh57NVWKEm/pZ9nfUonvlowpfaA= +tailscale.com v1.72.1/go.mod h1:v7OHtg0KLAnhOVf81Z8WrjNefj238QbFhgkWJQoKxbs= diff --git a/main.go b/main.go new file mode 100644 index 0000000..20bb51c --- /dev/null +++ b/main.go @@ -0,0 +1,172 @@ +package main + +import ( + "crypto/tls" + "embed" + "flag" + "fmt" + "html/template" + "log" + "net" + "net/http" + _ "net/http/pprof" + "os" + "time" + + "github.com/miekg/dns" + "tailscale.com/client/tailscale" + "tailscale.com/tsnet" + "tailscale.com/types/nettype" +) + +//go:embed templates +var templateFS embed.FS + +func httpLog(r *http.Request) { + n := time.Now() + fmt.Printf("%s (%s) [%s] \"%s %s\" %03d\n", + r.RemoteAddr, + n.Format(time.RFC822Z), + r.Method, + r.URL.Path, + r.Proto, + r.ContentLength, + ) +} + +func main() { + sName := flag.String("name", "", "server name") + dataDir := flag.String("data", "/var/lib/tsns", "path to store the records") + flag.Parse() + + var err error + records := &Records{} + records.templ, err = template.New("prod").ParseFS(templateFS, "templates/*") + + _, err = os.Stat(*dataDir) + if os.IsNotExist(err) { + log.Fatalf("%s does not exist", *dataDir) + } else { + err = records.Load(*dataDir) + if err != nil && os.IsNotExist(err) { + log.Fatalln(err) + } + } + + log.Println(records.Entries) + + tsServer := &tsnet.Server{ + Hostname: *sName, + } + tsLocalClient := &tailscale.LocalClient{} + tsLocalClient, err = tsServer.LocalClient() + if err != nil { + log.Fatal("can't get ts local client: ", err) + } + + httpListen, err := tsServer.Listen("tcp", ":443") + if err != nil { + log.Fatal("can't listen: ", err) + } + + dnsListen, err := tsServer.Listen("udp", ":53") + if err != nil { + log.Fatal("can't listen: ", err) + } + + mux := http.NewServeMux() + mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) { + httpLog(r) + if err := records.templ.ExecuteTemplate(w, "index", records); err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + } + }) + mux.HandleFunc("POST /records", func(w http.ResponseWriter, r *http.Request) { + httpLog(r) + + ipStr := r.FormValue("ip") + ip := net.ParseIP(ipStr) + rec := Record{ + Name: r.FormValue("name"), + IP: ip, + } + + records.Entries = append(records.Entries, rec) + records.Save(*dataDir) + + if err := records.templ.ExecuteTemplate(w, "table", records); err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + } + }) + mux.HandleFunc("DELETE /records/{name}", func(w http.ResponseWriter, r *http.Request) { + httpLog(r) + + records.Delete(r.PathValue("name")) + records.Save(*dataDir) + + if err := records.templ.ExecuteTemplate(w, "table", records); err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + } + }) + mux.HandleFunc("PUT /records/{name}", func(w http.ResponseWriter, r *http.Request) { + httpLog(r) + }) + + httpServer := &http.Server{ + Handler: mux, + TLSConfig: &tls.Config{ + GetCertificate: tsLocalClient.GetCertificate, + }, + } + + go httpServer.ServeTLS(httpListen, "", "") + + // Gross: since we can't do a net.PacketConn on our tailnet.. we do this hack.. + // https://github.com/tailscale/tailscale/issues/5871 + for { + conn, err := dnsListen.Accept() + if err != nil { + log.Println(err) + continue + } + // Gross Gross + server := &dns.Server{ + PacketConn: conn.(nettype.ConnPacketConn), + Net: "udp", + } + + // Groooosss + dns.HandleFunc(".", func(w dns.ResponseWriter, r *dns.Msg) { + msg := &dns.Msg{} + msg.SetReply(r) + for _, q := range r.Question { + ip := records.RetrieveIP(q.Name) + if ip != nil { + msg.Authoritative = true + msg.Answer = append(msg.Answer, &dns.A{ + A: *ip, + Hdr: dns.RR_Header{ + Name: q.Name, + Rrtype: dns.TypeA, + Class: dns.ClassINET, + Ttl: 60, + }, + }) + } + } + + w.WriteMsg(msg) + }) + + /// GRRRRR OOOOO SSEEEEEEaaaaaaaa + go func() { + defer server.Shutdown() + + err = server.ActivateAndServe() + if err != nil { + log.Fatal(err) + } + }() + + } +} diff --git a/module.nix b/module.nix new file mode 100644 index 0000000..5260b42 --- /dev/null +++ b/module.nix @@ -0,0 +1,84 @@ +{ lib +, config +, pkgs +, ... +}: +with lib; +let + cfg = config.services.tsns; + enabledServers = filterAttrs (_: conf: conf.enable) cfg.servers; +in +{ + options = { + services.tsns = { + package = mkPackageOption pkgs "tsns" { }; + + servers = mkOption { + description = "Configuration of multiple `tsns` instalces."; + default = { }; + + type = with types; attrsOf (submodule ({ name, ... }: { + options = { + enable = lib.mkEnableOption "Enable tsns for ${name}"; + user = mkOption { + type = with types; oneOf [ str int ]; + default = name; + description = '' + The user the service will use. + ''; + }; + + group = mkOption { + type = with types; oneOf [ str int ]; + default = name; + description = '' + The group the service will use. + ''; + }; + + dataDir = mkOption { + type = types.path; + default = "/var/lib/${name}"; + description = "Path tsns home directory"; + }; + }; + })); + }; + }; + }; + + config = mkIf (enabledServers != { }) { + environment.systemPackages = [ cfg.package ]; + + users.groups = mapAttrs' + (name: _: nameValuePair name { }) + enabledServers; + users.users = mapAttrs' + (name: conf: nameValuePair name { + description = "System user for tsns instance ${name}"; + isSystemUser = true; + group = name; + home = "${conf.dataDir}"; + createHome = true; + }) + enabledServers; + + systemd.services = mapAttrs' + (name: conf: nameValuePair name { + description = "tsns instance ${name}"; + enable = true; + after = [ "network-online.target" ]; + wants = [ "network-online.target" ]; + wantedBy = [ "multi-user.target" ]; + + environment = { HOME = "${conf.dataDir}"; }; + + serviceConfig = { + User = conf.user; + Group = conf.group; + ExecStart = "${cfg.package}/bin/tsns"; + }; + }) + enabledServers; + }; +} diff --git a/records.go b/records.go new file mode 100644 index 0000000..e99b1fa --- /dev/null +++ b/records.go @@ -0,0 +1,63 @@ +package main + +import ( + "encoding/json" + "html/template" + "net" + "os" + "path" + "slices" + "sync" + + "github.com/miekg/dns" +) + +type Record struct { + Name string `json:"name"` + IP net.IP `json:"ip"` +} + +type Records struct { + Entries []Record `json:"entries"` + mu sync.RWMutex + templ *template.Template +} + +func (r *Records) Delete(name string) { + r.mu.Lock() + defer r.mu.Unlock() + newEntries := slices.DeleteFunc(r.Entries, func(n Record) bool { + return n.Name == name + }) + r.Entries = newEntries +} + +func (r *Records) RetrieveIP(name string) *net.IP { + for _, entry := range r.Entries { + if dns.Fqdn(entry.Name) == dns.Fqdn(name) { + return &entry.IP + } + } + return nil +} + +func (r *Records) Load(dir string) error { + r.mu.RLock() + defer r.mu.RUnlock() + b, err := os.ReadFile(path.Join(dir, "records.json")) + if err != nil { + return err + } + return json.Unmarshal(b, r) +} + +func (r *Records) Save(dir string) error { + r.mu.Lock() + defer r.mu.Unlock() + b, err := json.Marshal(r) + if err != nil { + return err + } + + return os.WriteFile(path.Join(dir, "records.json"), b, 0600) +} diff --git a/records_test.go b/records_test.go new file mode 100644 index 0000000..13aa2cf --- /dev/null +++ b/records_test.go @@ -0,0 +1,68 @@ +package main + +import ( + "log" + "net" + "os" + "path" + "testing" +) + +var data = []byte(`{"entries":[{"name":"boop","ip":"127.0.0.1"}]}`) + +func TestLoad(t *testing.T) { + dir := t.TempDir() + err := os.WriteFile(path.Join(dir, "records.json"), data, 0600) + if err != nil { + t.Fatal(err) + } + + records := &Records{} + err = records.Load(dir) + if err != nil { + t.Fatal(err) + } + + ip := records.RetrieveIP("boop") + expected := net.IPv4(127, 0, 0, 1) + if !ip.Equal(expected) { + t.Fatalf("expected %q got %q\n", expected, ip) + } +} + +func TesDelete(t *testing.T) { + dir := t.TempDir() + err := os.WriteFile(path.Join(dir, "records.json"), data, 0600) + if err != nil { + t.Fatal(err) + } + + records := &Records{} + err = records.Load(dir) + if err != nil { + t.Fatal(err) + } + + if len(records.Entries) != 1 { + log.Fatalf("expected 1 entry got: %d\n", len(records.Entries)) + } + records.Delete("boop") + if len(records.Entries) != 0 { + t.Fatalf("expected 0 entries have: %dn", len(records.Entries)) + } +} + +func TestSave(t *testing.T) { + dir := t.TempDir() + records := &Records{} + + records.Entries = append(records.Entries, Record{ + IP: net.IPv4(127, 0, 0, 1), + Name: "boop", + }) + + err := records.Save(dir) + if err != nil { + t.Fatal(err) + } +} diff --git a/templates/templates.html b/templates/templates.html new file mode 100644 index 0000000..aef61c8 --- /dev/null +++ b/templates/templates.html @@ -0,0 +1,119 @@ +{{ block "index" . }} + + + + + tsns + + + + + +

tsns

+
+ {{ template "table" . }} +
+ {{ template "form" . }} + + +{{ end }} + +{{ block "table" . }} + + + + + + + + + + {{ range .Entries }} + {{ template "row" . }} + {{ end }} + +
NameIPManage
+{{ end }} + +{{ block "row" . }} + + {{ .Name }} + {{ .IP }} + +