From 63cd062dddd3321986e6e188e9fe72ab3a3dad66 Mon Sep 17 00:00:00 2001 From: Christine Dodrill Date: Mon, 1 Jun 2020 00:12:10 -0400 Subject: [PATCH] initial commit --- .envrc | 1 + .gitignore | 1 + LICENSE | 19 ++++++++ go.mod | 8 ++++ go.sum | 11 +++++ main.go | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++ relayd.json | 11 +++++ shell.nix | 10 +++++ 8 files changed, 187 insertions(+) create mode 100644 .envrc create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 relayd.json create mode 100644 shell.nix diff --git a/.envrc b/.envrc new file mode 100644 index 0000000..be81fed --- /dev/null +++ b/.envrc @@ -0,0 +1 @@ +eval "$(lorri direnv)" \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..691910f --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +relayd diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..3d1119d --- /dev/null +++ b/LICENSE @@ -0,0 +1,19 @@ +Copyright (c) 2020 Christine Dodrill + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. \ No newline at end of file diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..6a78861 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module tulpa.dev/cadey/relayd + +go 1.14 + +require ( + github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456 + golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..a393585 --- /dev/null +++ b/go.sum @@ -0,0 +1,11 @@ +github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456 h1:CkmB2l68uhvRlwOTPrwnuitSxi/S3Cg4L5QYOcL9MBc= +github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456/go.mod h1:zFhibDvPDWmtk4dAQ05sRobtyoffEHygEt3wSNuAzz8= +golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= +golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37 h1:cg5LA/zNPRzIXIWSCxQW10Rvpy94aQh3LT/ShoCpkHw= +golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= +golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ= +golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= +golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= +golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= diff --git a/main.go b/main.go new file mode 100644 index 0000000..667a637 --- /dev/null +++ b/main.go @@ -0,0 +1,126 @@ +// Command relayd is a simple TLS terminator using let's encrypt. +package main + +import ( + "context" + "crypto/tls" + "encoding/json" + "errors" + "flag" + "fmt" + "log" + "net/http" + "net/http/httputil" + "net/url" + "os" + "strings" + "time" + + "github.com/facebookgo/flagenv" + "golang.org/x/crypto/acme/autocert" +) + +func fwdhttps(w http.ResponseWriter, r *http.Request) { + switch r.Method { + case "POST", "PUT", "PATCH": + http.Error(w, "HTTPS access required", 400) + return + default: + http.RedirectHandler(fmt.Sprintf("https://%s%s", r.Host, r.RequestURI), http.StatusPermanentRedirect).ServeHTTP(w, r) + } +} + +var ( + insecurePort = flag.String("insecure-bind", ":80", "host/port to bind on for insecure (HTTP) traffic") + securePort = flag.String("secure-bind", ":443", "host/port to bind on for secure (HTTPS) traffic") + config = flag.String("cfg", "./relayd.json", "config file to read backend data from") + dataDir = flag.String("data-dir", "./.relayd", "data dir for certificates") +) + +type Site struct { + Domain string `json:"domain"` + URL *url.URL `json:"-"` + Target string `json:"target"` + PathPrefix string `json:"path_prefix"` +} + +type Config []Site + +func main() { + flagenv.Parse() + flag.Parse() + + go http.ListenAndServe(*insecurePort, http.HandlerFunc(fwdhttps)) + + var cfg Config + fin, err := os.Open(*config) + if err != nil { + log.Fatalf("can't open config file: %v", err) + } + defer fin.Close() + + err = json.NewDecoder(fin).Decode(&cfg) + if err != nil { + log.Fatalf("can't parse config: %v", err) + } + + m := autocert.Manager{ + Prompt: autocert.AcceptTOS, + HostPolicy: cfg.checkCert, + Cache: autocert.DirCache(*dataDir), + } + + for _, cfg := range cfg { + u, err := url.Parse(cfg.Target + cfg.PathPrefix) + if err != nil { + log.Fatalf("%v somehow isn't a url: %v", cfg.Target, err) + } + cfg.URL = u + } + + go func() { + err := http.ListenAndServe(*insecurePort, m.HTTPHandler(http.HandlerFunc(http.NotFound))) + if err != nil { + log.Fatal(err) + } + }() + + s := &http.Server{ + IdleTimeout: 5 * time.Minute, + Addr: *securePort, + TLSConfig: &tls.Config{GetCertificate: m.GetCertificate}, + Handler: cfg, + } + s.ListenAndServeTLS("", "") +} + +func (c Config) ServeHTTP(w http.ResponseWriter, r *http.Request) { + var s Site + for _, cfg := range c { + if r.Host == cfg.Domain && strings.HasPrefix(r.URL.Path, cfg.PathPrefix) { + s = cfg + } + } + + if s == *new(Site) { + http.Error(w, "unknown domain "+r.Host, http.StatusNotFound) + return + } + + if s.PathPrefix != "" { + r.URL.Path = strings.Split(r.URL.Path, s.PathPrefix)[1] + } + + rp := httputil.NewSingleHostReverseProxy(s.URL) + rp.ServeHTTP(w, r) +} + +func (c Config) checkCert(ctx context.Context, host string) error { + for _, cfg := range c { + if host == cfg.Domain { + return nil + } + } + + return errors.New("not allowed") +} diff --git a/relayd.json b/relayd.json new file mode 100644 index 0000000..ff13018 --- /dev/null +++ b/relayd.json @@ -0,0 +1,11 @@ +[ + { + "domain": "start.localhost.cetacean.club", + "target": "https://start.akua" + }, + { + "domain": "sekrit.localhost.cetacean.club", + "target": "http://127.0.0.1:42069", + "path_prefix": "/butts" + } +] diff --git a/shell.nix b/shell.nix new file mode 100644 index 0000000..1503eb1 --- /dev/null +++ b/shell.nix @@ -0,0 +1,10 @@ +let + pkgs = import {}; +in +pkgs.mkShell { + buildInputs = with pkgs; [ + go + goimports + nur.repos.xe.gopls + ]; +}