diff options
| -rw-r--r-- | cmd/cashierd/main.go | 404 | ||||
| -rw-r--r-- | server/handlers_test.go (renamed from cmd/cashierd/handlers_test.go) | 2 | ||||
| -rw-r--r-- | server/rpc.go (renamed from cmd/cashierd/rpc.go) | 4 | ||||
| -rw-r--r-- | server/server.go | 117 | ||||
| -rw-r--r-- | server/web.go | 313 |
5 files changed, 436 insertions, 404 deletions
diff --git a/cmd/cashierd/main.go b/cmd/cashierd/main.go index d355604..2e378bc 100644 --- a/cmd/cashierd/main.go +++ b/cmd/cashierd/main.go @@ -1,315 +1,20 @@ package main import ( - "crypto/rand" - "crypto/tls" - "encoding/hex" - "encoding/json" "flag" - "fmt" - "html/template" - "io" "log" - "net" - "net/http" - "os" - "strconv" - "strings" - "github.com/pkg/errors" - "github.com/soheilhy/cmux" - - "go4.org/wkfs" - "golang.org/x/crypto/acme/autocert" - "golang.org/x/oauth2" - - "github.com/gorilla/csrf" - "github.com/gorilla/handlers" - "github.com/gorilla/mux" - "github.com/gorilla/sessions" - wkfscache "github.com/nsheridan/autocert-wkfs-cache" - "github.com/nsheridan/cashier/lib" - "github.com/nsheridan/cashier/server/auth" - "github.com/nsheridan/cashier/server/auth/github" - "github.com/nsheridan/cashier/server/auth/gitlab" - "github.com/nsheridan/cashier/server/auth/google" + "github.com/nsheridan/cashier/server" "github.com/nsheridan/cashier/server/config" - "github.com/nsheridan/cashier/server/metrics" - "github.com/nsheridan/cashier/server/signer" - "github.com/nsheridan/cashier/server/static" - "github.com/nsheridan/cashier/server/store" - "github.com/nsheridan/cashier/server/templates" "github.com/nsheridan/cashier/server/wkfs/vaultfs" "github.com/nsheridan/wkfs/s3" - "github.com/prometheus/client_golang/prometheus/promhttp" - "github.com/sid77/drop" ) var ( cfg = flag.String("config_file", "cashierd.conf", "Path to configuration file.") - - authprovider auth.Provider - certstore store.CertStorer - keysigner *signer.KeySigner ) -// appContext contains local context - cookiestore, authsession etc. -type appContext struct { - cookiestore *sessions.CookieStore - authsession *auth.Session -} - -// getAuthTokenCookie retrieves a cookie from the request. -func (a *appContext) getAuthTokenCookie(r *http.Request) *oauth2.Token { - session, _ := a.cookiestore.Get(r, "session") - t, ok := session.Values["token"] - if !ok { - return nil - } - var tok oauth2.Token - if err := json.Unmarshal(t.([]byte), &tok); err != nil { - return nil - } - if !tok.Valid() { - return nil - } - return &tok -} - -// setAuthTokenCookie marshals the auth token and stores it as a cookie. -func (a *appContext) setAuthTokenCookie(w http.ResponseWriter, r *http.Request, t *oauth2.Token) { - session, _ := a.cookiestore.Get(r, "session") - val, _ := json.Marshal(t) - session.Values["token"] = val - session.Save(r, w) -} - -// getAuthStateCookie retrieves the oauth csrf state value from the client request. -func (a *appContext) getAuthStateCookie(r *http.Request) string { - session, _ := a.cookiestore.Get(r, "session") - state, ok := session.Values["state"] - if !ok { - return "" - } - return state.(string) -} - -// setAuthStateCookie saves the oauth csrf state value. -func (a *appContext) setAuthStateCookie(w http.ResponseWriter, r *http.Request, state string) { - session, _ := a.cookiestore.Get(r, "session") - session.Values["state"] = state - session.Save(r, w) -} - -func (a *appContext) getCurrentURL(r *http.Request) string { - session, _ := a.cookiestore.Get(r, "session") - path, ok := session.Values["auth_url"] - if !ok { - return "" - } - return path.(string) -} - -func (a *appContext) setCurrentURL(w http.ResponseWriter, r *http.Request) { - session, _ := a.cookiestore.Get(r, "session") - session.Values["auth_url"] = r.URL.Path - session.Save(r, w) -} - -func (a *appContext) isLoggedIn(w http.ResponseWriter, r *http.Request) bool { - tok := a.getAuthTokenCookie(r) - if !tok.Valid() || !authprovider.Valid(tok) { - return false - } - return true -} - -func (a *appContext) login(w http.ResponseWriter, r *http.Request) (int, error) { - a.setCurrentURL(w, r) - http.Redirect(w, r, "/auth/login", http.StatusSeeOther) - return http.StatusSeeOther, nil -} - -// parseKey retrieves and unmarshals the signing request. -func extractKey(r *http.Request) (*lib.SignRequest, error) { - var s lib.SignRequest - if err := json.NewDecoder(r.Body).Decode(&s); err != nil { - return nil, err - } - return &s, nil -} - -// signHandler handles the "/sign" path. -// It unmarshals the client token to an oauth token, validates it and signs the provided public ssh key. -func signHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - var t string - if ah := r.Header.Get("Authorization"); ah != "" { - if len(ah) > 6 && strings.ToUpper(ah[0:7]) == "BEARER " { - t = ah[7:] - } - } - if t == "" { - return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) - } - token := &oauth2.Token{ - AccessToken: t, - } - if !authprovider.Valid(token) { - return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) - } - - // Sign the pubkey and issue the cert. - req, err := extractKey(r) - if err != nil { - return http.StatusBadRequest, errors.Wrap(err, "unable to extract key from request") - } - username := authprovider.Username(token) - authprovider.Revoke(token) // We don't need this anymore. - cert, err := keysigner.SignUserKey(req, username) - if err != nil { - return http.StatusInternalServerError, errors.Wrap(err, "error signing key") - } - if err := certstore.SetCert(cert); err != nil { - log.Printf("Error recording cert: %v", err) - } - if err := json.NewEncoder(w).Encode(&lib.SignResponse{ - Status: "ok", - Response: string(lib.GetPublicKey(cert)), - }); err != nil { - return http.StatusInternalServerError, errors.Wrap(err, "error encoding response") - } - return http.StatusOK, nil -} - -// loginHandler starts the authentication process with the provider. -func loginHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - state := newState() - a.setAuthStateCookie(w, r, state) - a.authsession = authprovider.StartSession(state) - http.Redirect(w, r, a.authsession.AuthURL, http.StatusFound) - return http.StatusFound, nil -} - -// callbackHandler handles retrieving the access token from the auth provider and saves it for later use. -func callbackHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - if r.FormValue("state") != a.getAuthStateCookie(r) { - return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) - } - code := r.FormValue("code") - if err := a.authsession.Authorize(authprovider, code); err != nil { - return http.StatusInternalServerError, err - } - a.setAuthTokenCookie(w, r, a.authsession.Token) - http.Redirect(w, r, a.getCurrentURL(r), http.StatusFound) - return http.StatusFound, nil -} - -// rootHandler starts the auth process. If the client is authenticated it renders the token to the user. -func rootHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - if !a.isLoggedIn(w, r) { - return a.login(w, r) - } - tok := a.getAuthTokenCookie(r) - page := struct { - Token string - }{tok.AccessToken} - - tmpl := template.Must(template.New("token.html").Parse(templates.Token)) - tmpl.Execute(w, page) - return http.StatusOK, nil -} - -func listRevokedCertsHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - revoked, err := certstore.GetRevoked() - if err != nil { - return http.StatusInternalServerError, err - } - rl, err := keysigner.GenerateRevocationList(revoked) - if err != nil { - return http.StatusInternalServerError, errors.Wrap(err, "unable to generate KRL") - } - w.Header().Set("Content-Type", "application/octet-stream") - w.Write(rl) - return http.StatusOK, nil -} - -func listAllCertsHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - if !a.isLoggedIn(w, r) { - return a.login(w, r) - } - tmpl := template.Must(template.New("certs.html").Parse(templates.Certs)) - tmpl.Execute(w, map[string]interface{}{ - csrf.TemplateTag: csrf.TemplateField(r), - }) - return http.StatusOK, nil -} - -func listCertsJSONHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - if !a.isLoggedIn(w, r) { - return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) - } - includeExpired, _ := strconv.ParseBool(r.URL.Query().Get("all")) - certs, err := certstore.List(includeExpired) - j, err := json.Marshal(certs) - if err != nil { - return http.StatusInternalServerError, errors.New(http.StatusText(http.StatusInternalServerError)) - } - w.Write(j) - return http.StatusOK, nil -} - -func revokeCertHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { - if !a.isLoggedIn(w, r) { - return a.login(w, r) - } - r.ParseForm() - for _, id := range r.Form["cert_id"] { - if err := certstore.Revoke(id); err != nil { - return http.StatusInternalServerError, errors.Wrap(err, "unable to revoke") - } - } - http.Redirect(w, r, "/admin/certs", http.StatusSeeOther) - return http.StatusSeeOther, nil -} - -// appHandler is a handler which uses appContext to manage state. -type appHandler struct { - *appContext - h func(*appContext, http.ResponseWriter, *http.Request) (int, error) -} - -// ServeHTTP handles the request and writes responses. -func (ah appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { - status, err := ah.h(ah.appContext, w, r) - if err != nil { - log.Printf("HTTP %d: %q", status, err) - http.Error(w, err.Error(), status) - } -} - -// newState generates a state identifier for the oauth process. -func newState() string { - k := make([]byte, 32) - if _, err := io.ReadFull(rand.Reader, k); err != nil { - return "unexpectedstring" - } - return hex.EncodeToString(k) -} - -func loadCerts(certFile, keyFile string) (tls.Certificate, error) { - key, err := wkfs.ReadFile(keyFile) - if err != nil { - return tls.Certificate{}, errors.Wrap(err, "error reading TLS private key") - } - cert, err := wkfs.ReadFile(certFile) - if err != nil { - return tls.Certificate{}, errors.Wrap(err, "error reading TLS certificate") - } - return tls.X509KeyPair(cert, key) -} - func main() { - // Privileged section flag.Parse() conf, err := config.ReadConfig(*cfg) if err != nil { @@ -327,109 +32,6 @@ func main() { }) vaultfs.Register(conf.Vault) - keysigner, err = signer.New(conf.SSH) - if err != nil { - log.Fatal(err) - } - - logfile := os.Stderr - if conf.Server.HTTPLogFile != "" { - logfile, err = os.OpenFile(conf.Server.HTTPLogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0640) - if err != nil { - log.Printf("unable to open %s for writing. logging to stdout", conf.Server.HTTPLogFile) - logfile = os.Stderr - } - } - - laddr := fmt.Sprintf("%s:%d", conf.Server.Addr, conf.Server.Port) - l, err := net.Listen("tcp", laddr) - if err != nil { - log.Fatal(errors.Wrapf(err, "unable to listen on %s:%d", conf.Server.Addr, conf.Server.Port)) - } - - tlsConfig := &tls.Config{} - if conf.Server.UseTLS { - if conf.Server.LetsEncryptServername != "" { - m := autocert.Manager{ - Prompt: autocert.AcceptTOS, - Cache: wkfscache.Cache(conf.Server.LetsEncryptCache), - HostPolicy: autocert.HostWhitelist(conf.Server.LetsEncryptServername), - } - tlsConfig.GetCertificate = m.GetCertificate - } else { - if conf.Server.TLSCert == "" || conf.Server.TLSKey == "" { - log.Fatal("TLS cert or key not specified in config") - } - tlsConfig.Certificates = make([]tls.Certificate, 1) - tlsConfig.Certificates[0], err = loadCerts(conf.Server.TLSCert, conf.Server.TLSKey) - if err != nil { - log.Fatal(errors.Wrap(err, "unable to create TLS listener")) - } - } - l = tls.NewListener(l, tlsConfig) - } - - if conf.Server.User != "" { - log.Print("Dropping privileges...") - if err := drop.DropPrivileges(conf.Server.User); err != nil { - log.Fatal(errors.Wrap(err, "unable to drop privileges")) - } - } - - // Unprivileged section - metrics.Register() - - switch conf.Auth.Provider { - case "google": - authprovider, err = google.New(conf.Auth) - case "github": - authprovider, err = github.New(conf.Auth) - case "gitlab": - authprovider, err = gitlab.New(conf.Auth) - default: - log.Fatalf("Unknown provider %s\n", conf.Auth.Provider) - } - if err != nil { - log.Fatal(errors.Wrapf(err, "unable to use provider '%s'", conf.Auth.Provider)) - } - - certstore, err = store.New(conf.Server.Database) - if err != nil { - log.Fatal(err) - } - ctx := &appContext{ - cookiestore: sessions.NewCookieStore([]byte(conf.Server.CookieSecret)), - } - ctx.cookiestore.Options = &sessions.Options{ - MaxAge: 900, - Path: "/", - Secure: conf.Server.UseTLS, - HttpOnly: true, - } - - CSRF := csrf.Protect([]byte(conf.Server.CSRFSecret), csrf.Secure(conf.Server.UseTLS)) - r := mux.NewRouter() - r.Methods("GET").Path("/").Handler(appHandler{ctx, rootHandler}) - r.Methods("GET").Path("/auth/login").Handler(appHandler{ctx, loginHandler}) - r.Methods("GET").Path("/auth/callback").Handler(appHandler{ctx, callbackHandler}) - r.Methods("POST").Path("/sign").Handler(appHandler{ctx, signHandler}) - r.Methods("GET").Path("/revoked").Handler(appHandler{ctx, listRevokedCertsHandler}) - r.Methods("POST").Path("/admin/revoke").Handler(CSRF(appHandler{ctx, revokeCertHandler})) - r.Methods("GET").Path("/admin/certs").Handler(CSRF(appHandler{ctx, listAllCertsHandler})) - r.Methods("GET").Path("/admin/certs.json").Handler(appHandler{ctx, listCertsJSONHandler}) - r.Methods("GET").Path("/metrics").Handler(promhttp.Handler()) - r.PathPrefix("/").Handler(http.FileServer(static.FS(false))) - h := handlers.LoggingHandler(logfile, r) - - log.Printf("Starting server on %s", laddr) - s := &http.Server{ - Handler: h, - } - - cm := cmux.New(l) - httpl := cm.Match(cmux.HTTP1Fast()) - grpcl := cm.Match(cmux.HTTP2HeaderField("content-type", "application/grpc")) - go s.Serve(httpl) - go newGrpcServer(grpcl) - log.Fatal(cm.Serve()) + // Start the servers + server.Run(conf) } diff --git a/cmd/cashierd/handlers_test.go b/server/handlers_test.go index 934d5d0..b2646a3 100644 --- a/cmd/cashierd/handlers_test.go +++ b/server/handlers_test.go @@ -1,4 +1,4 @@ -package main +package server import ( "bytes" diff --git a/cmd/cashierd/rpc.go b/server/rpc.go index ad8aa5d..ce95e96 100644 --- a/cmd/cashierd/rpc.go +++ b/server/rpc.go @@ -1,4 +1,4 @@ -package main +package server import ( "log" @@ -61,7 +61,7 @@ func authInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServe return handler(ctx, req) } -func newGrpcServer(l net.Listener) { +func runGRPCServer(l net.Listener) { serv := grpc.NewServer(grpc.UnaryInterceptor(authInterceptor)) proto.RegisterSignerServer(serv, &rpcServer{}) serv.Serve(l) diff --git a/server/server.go b/server/server.go new file mode 100644 index 0000000..676a61b --- /dev/null +++ b/server/server.go @@ -0,0 +1,117 @@ +package server + +import ( + "crypto/tls" + "fmt" + "log" + "net" + + "github.com/pkg/errors" + "github.com/soheilhy/cmux" + + "go4.org/wkfs" + "golang.org/x/crypto/acme/autocert" + + wkfscache "github.com/nsheridan/autocert-wkfs-cache" + "github.com/nsheridan/cashier/server/auth" + "github.com/nsheridan/cashier/server/auth/github" + "github.com/nsheridan/cashier/server/auth/gitlab" + "github.com/nsheridan/cashier/server/auth/google" + "github.com/nsheridan/cashier/server/config" + "github.com/nsheridan/cashier/server/metrics" + "github.com/nsheridan/cashier/server/signer" + "github.com/nsheridan/cashier/server/store" + "github.com/sid77/drop" +) + +var ( + authprovider auth.Provider + certstore store.CertStorer + keysigner *signer.KeySigner +) + +func loadCerts(certFile, keyFile string) (tls.Certificate, error) { + key, err := wkfs.ReadFile(keyFile) + if err != nil { + return tls.Certificate{}, errors.Wrap(err, "error reading TLS private key") + } + cert, err := wkfs.ReadFile(certFile) + if err != nil { + return tls.Certificate{}, errors.Wrap(err, "error reading TLS certificate") + } + return tls.X509KeyPair(cert, key) +} + +// Run the HTTP and RPC servers. +func Run(conf *config.Config) { + var err error + keysigner, err = signer.New(conf.SSH) + if err != nil { + log.Fatal(err) + } + + laddr := fmt.Sprintf("%s:%d", conf.Server.Addr, conf.Server.Port) + l, err := net.Listen("tcp", laddr) + if err != nil { + log.Fatal(errors.Wrapf(err, "unable to listen on %s:%d", conf.Server.Addr, conf.Server.Port)) + } + + tlsConfig := &tls.Config{} + if conf.Server.UseTLS { + if conf.Server.LetsEncryptServername != "" { + m := autocert.Manager{ + Prompt: autocert.AcceptTOS, + Cache: wkfscache.Cache(conf.Server.LetsEncryptCache), + HostPolicy: autocert.HostWhitelist(conf.Server.LetsEncryptServername), + } + tlsConfig.GetCertificate = m.GetCertificate + } else { + if conf.Server.TLSCert == "" || conf.Server.TLSKey == "" { + log.Fatal("TLS cert or key not specified in config") + } + tlsConfig.Certificates = make([]tls.Certificate, 1) + tlsConfig.Certificates[0], err = loadCerts(conf.Server.TLSCert, conf.Server.TLSKey) + if err != nil { + log.Fatal(errors.Wrap(err, "unable to create TLS listener")) + } + } + l = tls.NewListener(l, tlsConfig) + } + + if conf.Server.User != "" { + log.Print("Dropping privileges...") + if err := drop.DropPrivileges(conf.Server.User); err != nil { + log.Fatal(errors.Wrap(err, "unable to drop privileges")) + } + } + + // Unprivileged section + metrics.Register() + + switch conf.Auth.Provider { + case "google": + authprovider, err = google.New(conf.Auth) + case "github": + authprovider, err = github.New(conf.Auth) + case "gitlab": + authprovider, err = gitlab.New(conf.Auth) + default: + log.Fatalf("Unknown provider %s\n", conf.Auth.Provider) + } + if err != nil { + log.Fatal(errors.Wrapf(err, "unable to use provider '%s'", conf.Auth.Provider)) + } + + certstore, err = store.New(conf.Server.Database) + if err != nil { + log.Fatal(err) + } + + log.Printf("Starting server on %s", laddr) + cm := cmux.New(l) + httpl := cm.Match(cmux.HTTP1Fast()) + grpcl := cm.Match(cmux.HTTP2HeaderField("content-type", "application/grpc")) + go runHTTPServer(conf.Server, httpl) + go runGRPCServer(grpcl) + log.Fatal(cm.Serve()) +} diff --git a/server/web.go b/server/web.go new file mode 100644 index 0000000..65eca49 --- /dev/null +++ b/server/web.go @@ -0,0 +1,313 @@ +package server + +import ( + "crypto/rand" + "encoding/hex" + "encoding/json" + "html/template" + "io" + "log" + "net" + "net/http" + "os" + "strconv" + "strings" + + "github.com/pkg/errors" + "github.com/prometheus/client_golang/prometheus/promhttp" + + "golang.org/x/oauth2" + + "github.com/gorilla/csrf" + "github.com/gorilla/handlers" + "github.com/gorilla/mux" + "github.com/gorilla/sessions" + "github.com/nsheridan/cashier/lib" + "github.com/nsheridan/cashier/server/auth" + "github.com/nsheridan/cashier/server/config" + "github.com/nsheridan/cashier/server/static" + "github.com/nsheridan/cashier/server/templates" +) + +// appContext contains local context - cookiestore, authsession etc. +type appContext struct { + cookiestore *sessions.CookieStore + authsession *auth.Session +} + +// getAuthTokenCookie retrieves a cookie from the request. +func (a *appContext) getAuthTokenCookie(r *http.Request) *oauth2.Token { + session, _ := a.cookiestore.Get(r, "session") + t, ok := session.Values["token"] + if !ok { + return nil + } + var tok oauth2.Token + if err := json.Unmarshal(t.([]byte), &tok); err != nil { + return nil + } + if !tok.Valid() { + return nil + } + return &tok +} + +// setAuthTokenCookie marshals the auth token and stores it as a cookie. +func (a *appContext) setAuthTokenCookie(w http.ResponseWriter, r *http.Request, t *oauth2.Token) { + session, _ := a.cookiestore.Get(r, "session") + val, _ := json.Marshal(t) + session.Values["token"] = val + session.Save(r, w) +} + +// getAuthStateCookie retrieves the oauth csrf state value from the client request. +func (a *appContext) getAuthStateCookie(r *http.Request) string { + session, _ := a.cookiestore.Get(r, "session") + state, ok := session.Values["state"] + if !ok { + return "" + } + return state.(string) +} + +// setAuthStateCookie saves the oauth csrf state value. +func (a *appContext) setAuthStateCookie(w http.ResponseWriter, r *http.Request, state string) { + session, _ := a.cookiestore.Get(r, "session") + session.Values["state"] = state + session.Save(r, w) +} + +func (a *appContext) getCurrentURL(r *http.Request) string { + session, _ := a.cookiestore.Get(r, "session") + path, ok := session.Values["auth_url"] + if !ok { + return "" + } + return path.(string) +} + +func (a *appContext) setCurrentURL(w http.ResponseWriter, r *http.Request) { + session, _ := a.cookiestore.Get(r, "session") + session.Values["auth_url"] = r.URL.Path + session.Save(r, w) +} + +func (a *appContext) isLoggedIn(w http.ResponseWriter, r *http.Request) bool { + tok := a.getAuthTokenCookie(r) + if !tok.Valid() || !authprovider.Valid(tok) { + return false + } + return true +} + +func (a *appContext) login(w http.ResponseWriter, r *http.Request) (int, error) { + a.setCurrentURL(w, r) + http.Redirect(w, r, "/auth/login", http.StatusSeeOther) + return http.StatusSeeOther, nil +} + +// parseKey retrieves and unmarshals the signing request. +func extractKey(r *http.Request) (*lib.SignRequest, error) { + var s lib.SignRequest + if err := json.NewDecoder(r.Body).Decode(&s); err != nil { + return nil, err + } + return &s, nil +} + +// signHandler handles the "/sign" path. +// It unmarshals the client token to an oauth token, validates it and signs the provided public ssh key. +func signHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + var t string + if ah := r.Header.Get("Authorization"); ah != "" { + if len(ah) > 6 && strings.ToUpper(ah[0:7]) == "BEARER " { + t = ah[7:] + } + } + if t == "" { + return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) + } + token := &oauth2.Token{ + AccessToken: t, + } + if !authprovider.Valid(token) { + return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) + } + + // Sign the pubkey and issue the cert. + req, err := extractKey(r) + if err != nil { + return http.StatusBadRequest, errors.Wrap(err, "unable to extract key from request") + } + username := authprovider.Username(token) + authprovider.Revoke(token) // We don't need this anymore. + cert, err := keysigner.SignUserKey(req, username) + if err != nil { + return http.StatusInternalServerError, errors.Wrap(err, "error signing key") + } + if err := certstore.SetCert(cert); err != nil { + log.Printf("Error recording cert: %v", err) + } + if err := json.NewEncoder(w).Encode(&lib.SignResponse{ + Status: "ok", + Response: string(lib.GetPublicKey(cert)), + }); err != nil { + return http.StatusInternalServerError, errors.Wrap(err, "error encoding response") + } + return http.StatusOK, nil +} + +// loginHandler starts the authentication process with the provider. +func loginHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + state := newState() + a.setAuthStateCookie(w, r, state) + a.authsession = authprovider.StartSession(state) + http.Redirect(w, r, a.authsession.AuthURL, http.StatusFound) + return http.StatusFound, nil +} + +// callbackHandler handles retrieving the access token from the auth provider and saves it for later use. +func callbackHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + if r.FormValue("state") != a.getAuthStateCookie(r) { + return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) + } + code := r.FormValue("code") + if err := a.authsession.Authorize(authprovider, code); err != nil { + return http.StatusInternalServerError, err + } + a.setAuthTokenCookie(w, r, a.authsession.Token) + http.Redirect(w, r, a.getCurrentURL(r), http.StatusFound) + return http.StatusFound, nil +} + +// rootHandler starts the auth process. If the client is authenticated it renders the token to the user. +func rootHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + if !a.isLoggedIn(w, r) { + return a.login(w, r) + } + tok := a.getAuthTokenCookie(r) + page := struct { + Token string + }{tok.AccessToken} + + tmpl := template.Must(template.New("token.html").Parse(templates.Token)) + tmpl.Execute(w, page) + return http.StatusOK, nil +} + +func listRevokedCertsHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + revoked, err := certstore.GetRevoked() + if err != nil { + return http.StatusInternalServerError, err + } + rl, err := keysigner.GenerateRevocationList(revoked) + if err != nil { + return http.StatusInternalServerError, errors.Wrap(err, "unable to generate KRL") + } + w.Header().Set("Content-Type", "application/octet-stream") + w.Write(rl) + return http.StatusOK, nil +} + +func listAllCertsHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + if !a.isLoggedIn(w, r) { + return a.login(w, r) + } + tmpl := template.Must(template.New("certs.html").Parse(templates.Certs)) + tmpl.Execute(w, map[string]interface{}{ + csrf.TemplateTag: csrf.TemplateField(r), + }) + return http.StatusOK, nil +} + +func listCertsJSONHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + if !a.isLoggedIn(w, r) { + return http.StatusUnauthorized, errors.New(http.StatusText(http.StatusUnauthorized)) + } + includeExpired, _ := strconv.ParseBool(r.URL.Query().Get("all")) + certs, err := certstore.List(includeExpired) + j, err := json.Marshal(certs) + if err != nil { + return http.StatusInternalServerError, errors.New(http.StatusText(http.StatusInternalServerError)) + } + w.Write(j) + return http.StatusOK, nil +} + +func revokeCertHandler(a *appContext, w http.ResponseWriter, r *http.Request) (int, error) { + if !a.isLoggedIn(w, r) { + return a.login(w, r) + } + r.ParseForm() + for _, id := range r.Form["cert_id"] { + if err := certstore.Revoke(id); err != nil { + return http.StatusInternalServerError, errors.Wrap(err, "unable to revoke") + } + } + http.Redirect(w, r, "/admin/certs", http.StatusSeeOther) + return http.StatusSeeOther, nil +} + +// appHandler is a handler which uses appContext to manage state. +type appHandler struct { + *appContext + h func(*appContext, http.ResponseWriter, *http.Request) (int, error) +} + +// ServeHTTP handles the request and writes responses. +func (ah appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + status, err := ah.h(ah.appContext, w, r) + if err != nil { + log.Printf("HTTP %d: %q", status, err) + http.Error(w, err.Error(), status) + } +} + +// newState generates a state identifier for the oauth process. +func newState() string { + k := make([]byte, 32) + if _, err := io.ReadFull(rand.Reader, k); err != nil { + return "unexpectedstring" + } + return hex.EncodeToString(k) +} + +func runHTTPServer(conf *config.Server, l net.Listener) { + var err error + ctx := &appContext{ + cookiestore: sessions.NewCookieStore([]byte(conf.CookieSecret)), + } + ctx.cookiestore.Options = &sessions.Options{ + MaxAge: 900, + Path: "/", + Secure: conf.UseTLS, + HttpOnly: true, + } + + logfile := os.Stderr + if conf.HTTPLogFile != "" { + logfile, err = os.OpenFile(conf.HTTPLogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0640) + if err != nil { + log.Printf("unable to open %s for writing. logging to stdout", conf.HTTPLogFile) + logfile = os.Stderr + } + } + + CSRF := csrf.Protect([]byte(conf.CSRFSecret), csrf.Secure(conf.UseTLS)) + r := mux.NewRouter() + r.Methods("GET").Path("/").Handler(appHandler{ctx, rootHandler}) + r.Methods("GET").Path("/auth/login").Handler(appHandler{ctx, loginHandler}) + r.Methods("GET").Path("/auth/callback").Handler(appHandler{ctx, callbackHandler}) + r.Methods("POST").Path("/sign").Handler(appHandler{ctx, signHandler}) + r.Methods("GET").Path("/revoked").Handler(appHandler{ctx, listRevokedCertsHandler}) + r.Methods("POST").Path("/admin/revoke").Handler(CSRF(appHandler{ctx, revokeCertHandler})) + r.Methods("GET").Path("/admin/certs").Handler(CSRF(appHandler{ctx, listAllCertsHandler})) + r.Methods("GET").Path("/admin/certs.json").Handler(appHandler{ctx, listCertsJSONHandler}) + r.Methods("GET").Path("/metrics").Handler(promhttp.Handler()) + r.PathPrefix("/").Handler(http.FileServer(static.FS(false))) + h := handlers.LoggingHandler(logfile, r) + s := &http.Server{ + Handler: h, + } + s.Serve(l) +} |