OAuth2 / JWT / OpenID Connect for mocking auth... which isn't that different from doing it for real, actually.
https://mock.pocketid.app
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626 lines
18 KiB
626 lines
18 KiB
package mockid
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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mathrand "math/rand"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"git.rootprojects.org/root/keypairs"
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"git.rootprojects.org/root/keypairs/keyfetch"
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"github.com/google/uuid"
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)
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func Route(jwksPrefix string, privkey keypairs.PrivateKey) http.Handler {
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Init()
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// TODO get from main()
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tokPrefix := jwksPrefix
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pubkey := keypairs.NewPublicKey(privkey.Public())
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http.HandleFunc("/api/new-nonce", func(w http.ResponseWriter, r *http.Request) {
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baseURL := getBaseURL(r)
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/*
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res.statusCode = 200;
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res.setHeader("Cache-Control", "max-age=0, no-cache, no-store");
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// TODO
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//res.setHeader("Date", "Sun, 10 Mar 2019 08:04:45 GMT");
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// is this the expiration of the nonce itself? methinks maybe so
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//res.setHeader("Expires", "Sun, 10 Mar 2019 08:04:45 GMT");
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// TODO use one of the registered domains
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//var indexUrl = "https://acme-staging-v02.api.letsencrypt.org/index"
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*/
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//var port = (state.config.ipc && state.config.ipc.port || state._ipc.port || undefined);
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//var indexUrl = "http://localhost:" + port + "/index";
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indexUrl := baseURL + "/index"
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w.Header().Set("Link", "<"+indexUrl+">;rel=\"index\"")
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w.Header().Set("Cache-Control", "max-age=0, no-cache, no-store")
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w.Header().Set("Pragma", "no-cache")
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//res.setHeader("Strict-Transport-Security", "max-age=604800");
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w.Header().Set("X-Frame-Options", "DENY")
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issueNonce(w, r)
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})
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http.HandleFunc("/api/new-account", requireNonce(func(w http.ResponseWriter, r *http.Request) {
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// Try to decode the request body into the struct. If there is an error,
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// respond to the client with the error message and a 400 status code.
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data := map[string]string{}
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err := json.NewDecoder(r.Body).Decode(&data)
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if nil != err {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// TODO check DNS for MX records
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parts := strings.Split(data["to"], ", <>\n\r\t")
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to := parts[0]
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if len(parts) > 1 || !strings.Contains(to, "@") {
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http.Error(w, "invalid email address", http.StatusBadRequest)
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return
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}
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// TODO expect JWK in JWS/JWT
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// TODO place validated JWK into file with token
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token, err := uuid.NewRandom()
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if nil != err {
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// nothing else to do if we run out of random
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// or are on a platform that doesn't support random
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panic(fmt.Errorf("random bytes read failure: %w", err))
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}
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token64 := base64.RawURLEncoding.EncodeToString([]byte(token[:]))
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// hash token to prevent fs read timing attacks
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hash := sha1.Sum(append(token[:], salt...))
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tokname := base64.RawURLEncoding.EncodeToString(hash[:])
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if err := ioutil.WriteFile(
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filepath.Join(tokPrefix, tokname+".tok.txt"),
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[]byte(`{"comment":"I have no idea..."}`),
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os.FileMode(0600),
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); nil != err {
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http.Error(w, "database connection failed when writing verification token", http.StatusInternalServerError)
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return
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}
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subject := "Verify New Account"
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// TODO go tpl
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// TODO determine OS and Browser from user agent
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baseURL := getBaseURL(r)
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text := fmt.Sprintf(
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"It looks like you just tried to register a new Pocket ID account.\n\n Verify account: %s/verify/%s\n\nNot you? Just ignore this message.",
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baseURL, token64,
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)
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_, err = SendSimpleMessage(to, defaultFrom, subject, text, defaultReplyTo)
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if nil != err {
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// TODO neuter mailgun output
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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fmt.Fprintf(w, `{ "success": true, "error": "" }%s`, "\n")
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}))
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// TODO use chi
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http.HandleFunc("/verify/", requireNonce(func(w http.ResponseWriter, r *http.Request) {
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parts := strings.Split(r.URL.Path, "/")
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if 3 != len(parts) {
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http.Error(w, "invalid url path", http.StatusBadRequest)
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return
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}
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token64 := parts[2]
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token, err := base64.RawURLEncoding.DecodeString(token64)
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if err != nil || 0 == len(token) {
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http.Error(w, "invalid url path", http.StatusBadRequest)
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return
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}
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// hash token to prevent fs read timing attacks
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hash := sha1.Sum(append(token, salt...))
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tokname := base64.RawURLEncoding.EncodeToString(hash[:])
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tokfile := filepath.Join(tokPrefix, tokname+".tok.txt")
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_, err = ioutil.ReadFile(tokfile)
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if nil != err {
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http.Error(w, "database connection failed when reading verification token", http.StatusInternalServerError)
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return
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}
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// TODO promote JWK to public... and related to an ID or email??
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os.Remove(tokfile)
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fmt.Fprintf(w, `{ "success": true, "error": "" }%s`, "\n")
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}))
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http.HandleFunc("/api/jwks", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s", r.Method, r.Host, r.URL.Path)
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if "POST" != r.Method {
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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tok := make(map[string]interface{})
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decoder := json.NewDecoder(r.Body)
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err := decoder.Decode(&tok)
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if nil != err {
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http.Error(w, "Bad Request: invalid json", http.StatusBadRequest)
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return
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}
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defer r.Body.Close()
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// TODO better, JSON error messages
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if _, ok := tok["d"]; ok {
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http.Error(w, "Bad Request: private key", http.StatusBadRequest)
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return
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}
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kty, _ := tok["kty"].(string)
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switch kty {
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case "EC":
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postEC(jwksPrefix, tok, w, r)
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case "RSA":
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postRSA(jwksPrefix, tok, w, r)
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default:
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http.Error(w, "Bad Request: only EC and RSA keys are supported", http.StatusBadRequest)
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return
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}
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})
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http.HandleFunc("/access_token", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s\n", r.Method, r.URL.Path)
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_, _, token := GenToken(getBaseURL(r), privkey, r.URL.Query())
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fmt.Fprintf(w, token)
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})
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getKty := func(r *http.Request) (string, error) {
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tok := make(map[string]interface{})
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decoder := json.NewDecoder(r.Body)
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err := decoder.Decode(&tok)
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if nil != err && io.EOF != err {
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log.Printf("json decode error: %s", err)
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return "", errors.New("Bad Request: invalid json body")
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}
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defer r.Body.Close()
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kty, _ := tok["kty"].(string)
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if "" == kty {
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if 0 == mathrand.Intn(2) {
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kty = "RSA"
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} else {
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kty = "EC"
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}
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}
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return kty, nil
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}
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http.HandleFunc("/private.jwk.json", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s", r.Method, r.URL.Path)
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if "POST" != r.Method {
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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kty, err := getKty(r)
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if nil != err {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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var privkey keypairs.PrivateKey
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if "RSA" == kty {
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keylen := 2048
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privkey, _ = rsa.GenerateKey(rndsrc, keylen)
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} else {
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privkey, _ = ecdsa.GenerateKey(elliptic.P256(), rndsrc)
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}
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jwk := MarshalJWKPrivateKey(privkey)
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w.Write(jwk)
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})
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http.HandleFunc("/priv.der", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s\n", r.Method, r.URL.Path)
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if "POST" != r.Method {
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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kty, err := getKty(r)
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if nil != err {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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var privkey keypairs.PrivateKey
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if "RSA" == kty {
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keylen := 2048
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privkey, _ = rsa.GenerateKey(rndsrc, keylen)
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} else {
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privkey, _ = ecdsa.GenerateKey(elliptic.P256(), rndsrc)
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}
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der, _ := MarshalDERPrivateKey(privkey)
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w.Write(der)
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})
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http.HandleFunc("/priv.pem", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s\n", r.Method, r.URL.Path)
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if "POST" != r.Method {
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return
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}
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kty, err := getKty(r)
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if nil != err {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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var privkey keypairs.PrivateKey
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if "RSA" == kty {
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keylen := 2048
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privkey, _ = rsa.GenerateKey(rndsrc, keylen)
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} else {
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privkey, _ = ecdsa.GenerateKey(elliptic.P256(), rndsrc)
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}
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privpem, _ := MarshalPEMPrivateKey(privkey)
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w.Write(privpem)
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})
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http.HandleFunc("/inspect_token", func(w http.ResponseWriter, r *http.Request) {
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token := r.Header.Get("Authorization")
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log.Printf("%s %s %s\n", r.Method, r.URL.Path, token)
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if "" == token {
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token = r.URL.Query().Get("access_token")
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if "" == token {
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http.Error(w, "Bad Format: missing Authorization header and 'access_token' query", http.StatusBadRequest)
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return
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}
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} else {
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parts := strings.Split(token, " ")
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if 2 != len(parts) {
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http.Error(w, "Bad Format: expected Authorization header to be in the format of 'Bearer <Token>'", http.StatusBadRequest)
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return
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}
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token = parts[1]
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}
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parts := strings.Split(token, ".")
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if 3 != len(parts) {
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http.Error(w, "Bad Format: token should be in the format of <protected-header>.<payload>.<signature>", http.StatusBadRequest)
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return
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}
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protected64 := parts[0]
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payload64 := parts[1]
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signature64 := parts[2]
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protectedB, err := base64.RawURLEncoding.DecodeString(protected64)
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if nil != err {
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http.Error(w, "Bad Format: token's header should be URL-safe base64 encoded", http.StatusBadRequest)
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return
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}
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payloadB, err := base64.RawURLEncoding.DecodeString(payload64)
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if nil != err {
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http.Error(w, "Bad Format: token's payload should be URL-safe base64 encoded", http.StatusBadRequest)
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return
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}
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// TODO verify signature
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sig, err := base64.RawURLEncoding.DecodeString(signature64)
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if nil != err {
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http.Error(w, "Bad Format: token's signature should be URL-safe base64 encoded", http.StatusBadRequest)
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return
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}
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errors := []string{}
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protected := map[string]interface{}{}
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err = json.Unmarshal(protectedB, &protected)
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if nil != err {
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http.Error(w, "Bad Format: token's header should be URL-safe base64-encoded JSON", http.StatusBadRequest)
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return
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}
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kid, kidOK := protected["kid"].(string)
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// TODO parse jwkM
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_, jwkOK := protected["jwk"]
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if !kidOK && !jwkOK {
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errors = append(errors, "must have either header.kid or header.jwk")
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}
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data := map[string]interface{}{}
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err = json.Unmarshal(payloadB, &data)
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if nil != err {
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http.Error(w, "Bad Format: token's payload should be URL-safe base64-encoded JSON", http.StatusBadRequest)
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return
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}
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iss, issOK := data["iss"].(string)
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if !jwkOK && !issOK {
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errors = append(errors, "payload.iss must exist to complement header.kid")
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}
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pub, err := keyfetch.OIDCJWK(kid, iss)
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if nil != err {
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fmt.Println("couldn't fetch pub key:")
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fmt.Println(err)
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}
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fmt.Println("fetched pub key:")
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fmt.Println(pub)
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hash := sha256.Sum256([]byte(fmt.Sprintf("%s.%s", protected64, payload64)))
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verified := JOSEVerify(pub, hash[:], sig)
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inspected := &InspectableToken{
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Public: pub,
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Protected: protected,
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Payload: data,
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Signature: signature64,
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Verified: verified,
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Errors: errors,
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}
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tokenB, _ := json.MarshalIndent(inspected, "", " ")
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if nil != err {
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http.Error(w, "Bad Format: malformed token, or malformed jwk at issuer url", http.StatusInternalServerError)
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return
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}
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fmt.Fprintf(w, string(tokenB))
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})
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http.HandleFunc("/authorization_header", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s\n", r.Method, r.URL.Path)
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var header string
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headers, _ := r.URL.Query()["header"]
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if 0 == len(headers) {
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header = "Authorization"
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} else {
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header = headers[0]
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}
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var prefix string
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prefixes, _ := r.URL.Query()["prefix"]
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if 0 == len(prefixes) {
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prefix = "Bearer "
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} else {
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prefix = prefixes[0]
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}
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_, _, token := GenToken(getBaseURL(r), privkey, r.URL.Query())
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fmt.Fprintf(w, "%s: %s%s", header, prefix, token)
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})
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http.HandleFunc("/key.jwk.json", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s", r.Method, r.URL.Path)
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jwk := string(MarshalJWKPrivateKey(privkey))
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jwk = strings.Replace(jwk, `{"`, `{ "`, 1)
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jwk = strings.Replace(jwk, `",`, `", `, -1)
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jwk = jwk[0 : len(jwk)-1]
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jwk = jwk + `, "ext": true , "key_ops": ["sign"] }`
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// `{ "kty": "EC" , "crv": %q , "d": %q , "x": %q , "y": %q }`, jwk.Crv, jwk.D, jwk.X, jwk.Y
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fmt.Fprintf(w, jwk)
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})
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http.HandleFunc("/.well-known/openid-configuration", func(w http.ResponseWriter, r *http.Request) {
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baseURL := getBaseURL(r)
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log.Printf("%s %s\n", r.Method, r.URL.Path)
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fmt.Fprintf(w, `{ "issuer": "%s", "jwks_uri": "%s/.well-known/jwks.json" }`, baseURL, baseURL)
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})
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http.HandleFunc("/.well-known/jwks.json", func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s", r.Method, r.Host, r.URL.Path)
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parts := strings.Split(r.Host, ".")
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kid := parts[0]
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b, err := ioutil.ReadFile(filepath.Join(jwksPrefix, strings.ToLower(kid)+".jwk.json"))
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if nil != err {
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//http.Error(w, "Not Found", http.StatusNotFound)
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exp := strconv.FormatInt(time.Now().Add(15*time.Minute).Unix(), 10)
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jwk := string(keypairs.MarshalJWKPublicKey(pubkey))
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jwk = strings.Replace(jwk, `{"`, `{ "`, 1)
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jwk = strings.Replace(jwk, `",`, `" ,`, -1)
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jwk = jwk[0 : len(jwk)-1]
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jwk = jwk + fmt.Sprintf(`, "ext": true , "key_ops": ["verify"], "exp": %s }`, exp)
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// { "kty": "EC" , "crv": %q , "x": %q , "y": %q , "kid": %q , "ext": true , "key_ops": ["verify"] , "exp": %s }
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jwkstr := fmt.Sprintf(`{ "keys": [ %s ] }`, jwk)
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fmt.Println(jwkstr)
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fmt.Fprintf(w, jwkstr)
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return
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}
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tok := &PublicJWK{}
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err = json.Unmarshal(b, tok)
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if nil != err {
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// TODO delete the bad file?
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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return
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}
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jwkstr := fmt.Sprintf(
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`{ "keys": [ { "kty": "EC", "crv": %q, "x": %q, "y": %q, "kid": %q,`+
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` "ext": true, "key_ops": ["verify"], "exp": %s } ] }`,
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tok.Crv, tok.X, tok.Y, tok.KeyID, strconv.FormatInt(time.Now().Add(15*time.Minute).Unix(), 10),
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)
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fmt.Println(jwkstr)
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fmt.Fprintf(w, jwkstr)
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})
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return http.DefaultServeMux
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}
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func getBaseURL(r *http.Request) string {
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var scheme string
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if nil != r.TLS || "https" == r.Header.Get("X-Forwarded-Proto") {
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scheme = "https:"
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} else {
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scheme = "http:"
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}
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return fmt.Sprintf(
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"%s//%s",
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scheme,
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r.Host,
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)
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}
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type HTTPError struct {
|
|
message string
|
|
code int
|
|
}
|
|
|
|
func postEC(jwksPrefix string, tok map[string]interface{}, w http.ResponseWriter, r *http.Request) {
|
|
data, err := postECHelper(r.Host, jwksPrefix, tok, r)
|
|
if nil != err {
|
|
http.Error(w, err.message, err.code)
|
|
return
|
|
}
|
|
w.Write(data)
|
|
}
|
|
|
|
func postECHelper(hostname, jwksPrefix string, tok map[string]interface{}, r *http.Request) ([]byte, *HTTPError) {
|
|
crv, ok := tok["crv"].(string)
|
|
if 5 != len(crv) || "P-" != crv[:2] {
|
|
return nil, &HTTPError{"Bad Request: bad curve", http.StatusBadRequest}
|
|
}
|
|
x, ok := tok["x"].(string)
|
|
if !ok {
|
|
return nil, &HTTPError{"Bad Request: missing 'x'", http.StatusBadRequest}
|
|
}
|
|
y, ok := tok["y"].(string)
|
|
if !ok {
|
|
return nil, &HTTPError{"Bad Request: missing 'y'", http.StatusBadRequest}
|
|
}
|
|
|
|
thumbprintable := []byte(
|
|
fmt.Sprintf(`{"crv":%q,"kty":"EC","x":%q,"y":%q}`, crv, x, y),
|
|
)
|
|
alg := crv[2:]
|
|
|
|
var thumb []byte
|
|
switch alg {
|
|
case "256":
|
|
hash := sha256.Sum256(thumbprintable)
|
|
thumb = hash[:]
|
|
case "384":
|
|
hash := sha512.Sum384(thumbprintable)
|
|
thumb = hash[:]
|
|
case "521":
|
|
fallthrough
|
|
case "512":
|
|
hash := sha512.Sum512(thumbprintable)
|
|
thumb = hash[:]
|
|
default:
|
|
return nil, &HTTPError{"Bad Request: bad key length or curve", http.StatusBadRequest}
|
|
}
|
|
|
|
kid := base64.RawURLEncoding.EncodeToString(thumb)
|
|
if kid2, _ := tok["kid"].(string); "" != kid2 && kid != kid2 {
|
|
return nil, &HTTPError{"Bad Request: kid should be " + kid, http.StatusBadRequest}
|
|
}
|
|
|
|
pub := []byte(fmt.Sprintf(
|
|
`{"crv":%q,"kid":%q,"kty":"EC","x":%q,"y":%q}`, crv, kid, x, y,
|
|
))
|
|
|
|
// TODO allow posting at the top-level?
|
|
// TODO support a group of keys by PPID
|
|
// (right now it's only by KID)
|
|
if !strings.HasPrefix(hostname, strings.ToLower(kid)+".") {
|
|
return nil, &HTTPError{"Bad Request: prefix should be " + kid, http.StatusBadRequest}
|
|
}
|
|
|
|
if err := ioutil.WriteFile(
|
|
filepath.Join(jwksPrefix, strings.ToLower(kid)+".jwk.json"),
|
|
pub,
|
|
0644,
|
|
); nil != err {
|
|
fmt.Println("can't write file")
|
|
return nil, &HTTPError{"Internal Server Error", http.StatusInternalServerError}
|
|
}
|
|
|
|
baseURL := getBaseURL(r)
|
|
return []byte(fmt.Sprintf(
|
|
`{ "iss":%q, "jwks_url":%q }`, baseURL+"/", baseURL+"/.well-known/jwks.json",
|
|
)), nil
|
|
}
|
|
|
|
func postRSA(jwksPrefix string, tok map[string]interface{}, w http.ResponseWriter, r *http.Request) {
|
|
data, err := postRSAHelper(r.Host, jwksPrefix, tok, r)
|
|
if nil != err {
|
|
http.Error(w, err.message, err.code)
|
|
return
|
|
}
|
|
w.Write(data)
|
|
}
|
|
|
|
func postRSAHelper(hostname, jwksPrefix string, tok map[string]interface{}, r *http.Request) ([]byte, *HTTPError) {
|
|
e, ok := tok["e"].(string)
|
|
if !ok {
|
|
return nil, &HTTPError{"Bad Request: missing 'e'", http.StatusBadRequest}
|
|
}
|
|
n, ok := tok["n"].(string)
|
|
if !ok {
|
|
return nil, &HTTPError{"Bad Request: missing 'n'", http.StatusBadRequest}
|
|
}
|
|
|
|
thumbprintable := []byte(
|
|
fmt.Sprintf(`{"e":%q,"kty":"RSA","n":%q}`, e, n),
|
|
)
|
|
|
|
var thumb []byte
|
|
// TODO handle bit lengths well
|
|
switch 3 * (len(n) / 4.0) {
|
|
case 256:
|
|
hash := sha256.Sum256(thumbprintable)
|
|
thumb = hash[:]
|
|
case 384:
|
|
hash := sha512.Sum384(thumbprintable)
|
|
thumb = hash[:]
|
|
case 512:
|
|
hash := sha512.Sum512(thumbprintable)
|
|
thumb = hash[:]
|
|
default:
|
|
return nil, &HTTPError{"Bad Request: only standard RSA key lengths (2048, 3072, 4096) are supported", http.StatusBadRequest}
|
|
}
|
|
|
|
kid := base64.RawURLEncoding.EncodeToString(thumb)
|
|
if kid2, _ := tok["kid"].(string); "" != kid2 && kid != kid2 {
|
|
return nil, &HTTPError{"Bad Request: kid should be " + kid, http.StatusBadRequest}
|
|
}
|
|
|
|
pub := []byte(fmt.Sprintf(
|
|
`{"e":%q,"kid":%q,"kty":"EC","n":%q}`, e, kid, n,
|
|
))
|
|
|
|
// TODO allow posting at the top-level?
|
|
// TODO support a group of keys by PPID
|
|
// (right now it's only by KID)
|
|
if !strings.HasPrefix(hostname, strings.ToLower(kid)+".") {
|
|
return nil, &HTTPError{"Bad Request: prefix should be " + kid, http.StatusBadRequest}
|
|
}
|
|
|
|
if err := ioutil.WriteFile(
|
|
filepath.Join(jwksPrefix, strings.ToLower(kid)+".jwk.json"),
|
|
pub,
|
|
0644,
|
|
); nil != err {
|
|
fmt.Println("can't write file")
|
|
return nil, &HTTPError{"Internal Server Error", http.StatusInternalServerError}
|
|
}
|
|
|
|
baseURL := getBaseURL(r)
|
|
return []byte(fmt.Sprintf(
|
|
`{ "iss":%q, "jwks_url":%q }`, baseURL+"/", baseURL+"/.well-known/jwks.json",
|
|
)), nil
|
|
}
|
|
|