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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569 lines
15 KiB
569 lines
15 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/rand"
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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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"fmt"
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"io/ioutil"
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"log"
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"math/big"
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"net/http"
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"net/url"
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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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)
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type PrivateJWK struct {
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PublicJWK
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D string `json:"d"`
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}
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type PublicJWK struct {
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Crv string `json:"crv"`
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KeyID string `json:"kid,omitempty"`
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Kty string `json:"kty,omitempty"`
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X string `json:"x"`
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Y string `json:"y"`
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}
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var nonces map[string]int64
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func init() {
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nonces = make(map[string]int64)
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}
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func Route(jwksPrefix string, priv *ecdsa.PrivateKey, jwk *PrivateJWK) {
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pub := &priv.PublicKey
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thumbprint := thumbprintKey(pub)
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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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http.Error(w, "Not Implemented", http.StatusNotImplemented)
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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), priv, r.URL.Query())
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fmt.Fprintf(w, token)
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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>.<body>.<signature>", http.StatusBadRequest)
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return
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}
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protected64 := parts[0]
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data64 := 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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dataB, err := base64.RawURLEncoding.DecodeString(data64)
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if nil != err {
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http.Error(w, "Bad Format: token's body 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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_, 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(dataB, &data)
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if nil != err {
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http.Error(w, "Bad Format: token's body 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, "body.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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inspected := struct {
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Public keypairs.PublicKey `json:"public"`
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Protected map[string]interface{} `json:"protected"`
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Body map[string]interface{} `json:"body"`
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Signature string `json:"signature"`
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Verified bool `json:"verified"`
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Errors []string `json:"errors"`
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}{
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Public: pub,
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Protected: protected,
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Body: data,
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Signature: signature64,
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Verified: false,
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Errors: errors,
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}
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tokenB, err := json.Marshal(inspected)
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if nil != err {
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fmt.Println("couldn't serialize inpsected token:")
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fmt.Println(err)
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}
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fmt.Println("serialized inpsected token")
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fmt.Println(inspected)
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fmt.Println(string(tokenB))
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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), priv, 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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fmt.Fprintf(w, `{ "kty": "EC" , "crv": %q , "d": %q , "x": %q , "y": %q , "ext": true , "key_ops": ["sign"] }`, jwk.Crv, jwk.D, jwk.X, jwk.Y)
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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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jwkstr := fmt.Sprintf(
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`{ "keys": [ { "kty": "EC" , "crv": %q , "x": %q , "y": %q , "kid": %q , "ext": true , "key_ops": ["verify"] , "exp": %s } ] }`,
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jwk.Crv, jwk.X, jwk.Y, thumbprint, 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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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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}
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func parseExp(exp string) (int, error) {
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if "" == exp {
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exp = "15m"
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}
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mult := 1
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switch exp[len(exp)-1] {
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case 'w':
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mult *= 7
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fallthrough
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case 'd':
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mult *= 24
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fallthrough
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case 'h':
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mult *= 60
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fallthrough
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case 'm':
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mult *= 60
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fallthrough
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case 's':
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// no fallthrough
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default:
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// could be 'k' or 'z', but we assume its empty
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exp += "s"
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}
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num, err := strconv.Atoi(exp[:len(exp)-1])
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if nil != err {
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return 0, err
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}
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return num * mult, nil
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}
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func postEC(jwksPrefix string, tok map[string]interface{}, w http.ResponseWriter, r *http.Request) {
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crv, ok := tok["crv"].(string)
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if 5 != len(crv) || "P-" != crv[:2] {
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http.Error(w, "Bad Request: bad curve", http.StatusBadRequest)
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return
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}
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x, ok := tok["x"].(string)
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if !ok {
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http.Error(w, "Bad Request: missing 'x'", http.StatusBadRequest)
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return
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}
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y, ok := tok["y"].(string)
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if !ok {
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http.Error(w, "Bad Request: missing 'y'", http.StatusBadRequest)
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return
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}
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thumbprintable := []byte(
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fmt.Sprintf(`{"crv":%q,"kty":"EC","x":%q,"y":%q}`, crv, x, y),
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)
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alg := crv[2:]
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var thumb []byte
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switch alg {
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case "256":
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hash := sha256.Sum256(thumbprintable)
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thumb = hash[:]
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case "384":
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hash := sha512.Sum384(thumbprintable)
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thumb = hash[:]
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case "521":
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fallthrough
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case "512":
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hash := sha512.Sum512(thumbprintable)
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thumb = hash[:]
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default:
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http.Error(w, "Bad Request: bad key length or curve", http.StatusBadRequest)
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return
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}
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kid := base64.RawURLEncoding.EncodeToString(thumb)
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if kid2, _ := tok["kid"].(string); "" != kid2 && kid != kid2 {
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http.Error(w, "Bad Request: kid should be "+kid, http.StatusBadRequest)
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return
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}
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pub := []byte(fmt.Sprintf(
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`{"crv":%q,"kid":%q,"kty":"EC","x":%q,"y":%q}`, crv, kid, x, y,
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))
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// TODO allow posting at the top-level?
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// TODO support a group of keys by PPID
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// (right now it's only by KID)
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if !strings.HasPrefix(r.Host, strings.ToLower(kid)+".") {
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http.Error(w, "Bad Request: prefix should be "+kid, http.StatusBadRequest)
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return
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}
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if err := ioutil.WriteFile(
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filepath.Join(jwksPrefix, strings.ToLower(kid)+".jwk.json"),
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pub,
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0644,
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); nil != err {
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fmt.Println("can't write 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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baseURL := getBaseURL(r)
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w.Write([]byte(fmt.Sprintf(
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`{ "iss":%q, "jwks_url":%q }`, baseURL+"/", baseURL+"/.well-known/jwks.json",
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)))
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}
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func postRSA(jwksPrefix string, tok map[string]interface{}, w http.ResponseWriter, r *http.Request) {
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e, ok := tok["e"].(string)
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if !ok {
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http.Error(w, "Bad Request: missing 'e'", http.StatusBadRequest)
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return
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}
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n, ok := tok["n"].(string)
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if !ok {
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http.Error(w, "Bad Request: missing 'n'", http.StatusBadRequest)
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return
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}
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thumbprintable := []byte(
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fmt.Sprintf(`{"e":%q,"kty":"RSA","n":%q}`, e, n),
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)
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var thumb []byte
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// TODO handle bit lengths well
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switch 3 * (len(n) / 4.0) {
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case 256:
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hash := sha256.Sum256(thumbprintable)
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thumb = hash[:]
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case 384:
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hash := sha512.Sum384(thumbprintable)
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thumb = hash[:]
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case 512:
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hash := sha512.Sum512(thumbprintable)
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thumb = hash[:]
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default:
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http.Error(w, "Bad Request: only standard RSA key lengths (2048, 3072, 4096) are supported", http.StatusBadRequest)
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return
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}
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|
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kid := base64.RawURLEncoding.EncodeToString(thumb)
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if kid2, _ := tok["kid"].(string); "" != kid2 && kid != kid2 {
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http.Error(w, "Bad Request: kid should be "+kid, http.StatusBadRequest)
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return
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}
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|
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pub := []byte(fmt.Sprintf(
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`{"e":%q,"kid":%q,"kty":"EC","n":%q}`, e, kid, n,
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))
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|
|
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// TODO allow posting at the top-level?
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// TODO support a group of keys by PPID
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// (right now it's only by KID)
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if !strings.HasPrefix(r.Host, strings.ToLower(kid)+".") {
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http.Error(w, "Bad Request: prefix should be "+kid, http.StatusBadRequest)
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return
|
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}
|
|
|
|
if err := ioutil.WriteFile(
|
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filepath.Join(jwksPrefix, strings.ToLower(kid)+".jwk.json"),
|
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pub,
|
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0644,
|
|
); nil != err {
|
|
fmt.Println("can't write 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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baseURL := getBaseURL(r)
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w.Write([]byte(fmt.Sprintf(
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`{ "iss":%q, "jwks_url":%q }`, baseURL+"/", baseURL+"/.well-known/jwks.json",
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)))
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}
|
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|
|
func GenToken(host string, priv *ecdsa.PrivateKey, query url.Values) (string, string, string) {
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thumbprint := thumbprintKey(&priv.PublicKey)
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protected := fmt.Sprintf(`{"typ":"JWT","alg":"ES256","kid":"%s"}`, thumbprint)
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protected64 := base64.RawURLEncoding.EncodeToString([]byte(protected))
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|
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exp, err := parseExp(query.Get("exp"))
|
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if nil != err {
|
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// cryptic error code
|
|
// TODO propagate error
|
|
exp = 422
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|
}
|
|
|
|
payload := fmt.Sprintf(
|
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`{"iss":"%s/","sub":"dummy","exp":%s}`,
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host, strconv.FormatInt(time.Now().Add(time.Duration(exp)*time.Second).Unix(), 10),
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)
|
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payload64 := base64.RawURLEncoding.EncodeToString([]byte(payload))
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|
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hash := sha256.Sum256([]byte(fmt.Sprintf(`%s.%s`, protected64, payload64)))
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r, s, _ := ecdsa.Sign(rand.Reader, priv, hash[:])
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rb := r.Bytes()
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for len(rb) < 32 {
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rb = append([]byte{0}, rb...)
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|
}
|
|
sb := s.Bytes()
|
|
for len(rb) < 32 {
|
|
sb = append([]byte{0}, sb...)
|
|
}
|
|
sig64 := base64.RawURLEncoding.EncodeToString(append(rb, sb...))
|
|
token := fmt.Sprintf("%s.%s.%s\n", protected64, payload64, sig64)
|
|
return protected, payload, token
|
|
}
|
|
|
|
func ParseKey(jwk *PrivateJWK) *ecdsa.PrivateKey {
|
|
xb, _ := base64.RawURLEncoding.DecodeString(jwk.X)
|
|
xi := &big.Int{}
|
|
xi.SetBytes(xb)
|
|
yb, _ := base64.RawURLEncoding.DecodeString(jwk.Y)
|
|
yi := &big.Int{}
|
|
yi.SetBytes(yb)
|
|
pub := &ecdsa.PublicKey{
|
|
Curve: elliptic.P256(),
|
|
X: xi,
|
|
Y: yi,
|
|
}
|
|
|
|
db, _ := base64.RawURLEncoding.DecodeString(jwk.D)
|
|
di := &big.Int{}
|
|
di.SetBytes(db)
|
|
priv := &ecdsa.PrivateKey{
|
|
PublicKey: *pub,
|
|
D: di,
|
|
}
|
|
return priv
|
|
}
|
|
|
|
func thumbprintKey(pub *ecdsa.PublicKey) string {
|
|
minpub := []byte(fmt.Sprintf(`{"crv":%q,"kty":"EC","x":%q,"y":%q}`, "P-256", pub.X, pub.Y))
|
|
sha := sha256.Sum256(minpub)
|
|
return base64.RawURLEncoding.EncodeToString(sha[:])
|
|
}
|
|
|
|
func issueNonce(w http.ResponseWriter, r *http.Request) {
|
|
b := make([]byte, 16)
|
|
_, _ = rand.Read(b)
|
|
nonce := base64.RawURLEncoding.EncodeToString(b)
|
|
nonces[nonce] = time.Now().Unix()
|
|
|
|
w.Header().Set("Replay-Nonce", nonce)
|
|
}
|
|
|
|
func requireNonce(next http.HandlerFunc) http.HandlerFunc {
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
nonce := r.Header.Get("Replay-Nonce")
|
|
// TODO expire nonces every so often
|
|
t := nonces[nonce]
|
|
if 0 == t {
|
|
http.Error(
|
|
w,
|
|
`{ "error": "invalid or expired nonce", "error_code": "ENONCE" }`,
|
|
http.StatusBadRequest,
|
|
)
|
|
return
|
|
}
|
|
|
|
delete(nonces, nonce)
|
|
issueNonce(w, r)
|
|
|
|
next(w, r)
|
|
}
|
|
}
|
|
|
|
func getBaseURL(r *http.Request) string {
|
|
var scheme string
|
|
if nil != r.TLS || "https" == r.Header.Get("X-Forwarded-Proto") {
|
|
scheme = "https:"
|
|
} else {
|
|
scheme = "http:"
|
|
}
|
|
return fmt.Sprintf(
|
|
"%s//%s",
|
|
scheme,
|
|
r.Host,
|
|
)
|
|
}
|
|
|