AJ ONeal
4 years ago
7 changed files with 334 additions and 23 deletions
@ -0,0 +1,57 @@ |
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package api |
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import ( |
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"encoding/json" |
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"net/http" |
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"git.coolaj86.com/coolaj86/go-mockid/xkeypairs" |
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) |
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// SignJWS will create an uncompressed JWT with the given payload
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func SignJWS(w http.ResponseWriter, r *http.Request) { |
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sign(w, r, false) |
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} |
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// SignJWT will create an compressed JWS (JWT) with the given payload
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func SignJWT(w http.ResponseWriter, r *http.Request) { |
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sign(w, r, true) |
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} |
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func sign(w http.ResponseWriter, r *http.Request, jwt bool) { |
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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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opts, err := getOpts(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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privkey, err := getPrivKey(opts) |
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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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header := opts.Header |
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if 0 != opts.Seed { |
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header["_seed"] = opts.Seed |
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} |
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jws, err := xkeypairs.SignClaims(privkey, header, opts.Claims) |
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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 b []byte |
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if jwt { |
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s := xkeypairs.JWSToJWT(jws) |
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w.Write(append([]byte(s), '\n')) |
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return |
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} |
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b, _ = json.Marshal(jws) |
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w.Write(append(b, '\n')) |
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} |
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@ -0,0 +1,170 @@ |
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package xkeypairs |
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import ( |
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"crypto" |
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"crypto/ecdsa" |
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"crypto/rand" |
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"crypto/rsa" |
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"crypto/sha256" |
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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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mathrand "math/rand" |
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"time" |
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"git.rootprojects.org/root/keypairs" |
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) |
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var RandomReader = rand.Reader |
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type JWS struct { |
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Header Object `json:"header"` // JSON
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Claims Object `json:"claims"` // JSON
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Protected string `json:"protected"` // base64
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Payload string `json:"payload"` // base64
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Signature string `json:"signature"` // base64
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} |
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type Object = map[string]interface{} |
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func SignClaims(privkey keypairs.PrivateKey, header Object, claims Object) (*JWS, error) { |
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var randsrc io.Reader = RandomReader |
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seed, _ := header["_seed"].(int64) |
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if 0 != seed { |
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randsrc = mathrand.New(mathrand.NewSource(seed)) |
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//delete(header, "_seed")
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} |
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protected, err := headerToProtected(keypairs.NewPublicKey(privkey.Public()), header) |
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if nil != err { |
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return nil, err |
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} |
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protected64 := base64.RawURLEncoding.EncodeToString(protected) |
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payload, err := claimsToPayload(claims) |
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if nil != err { |
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return nil, err |
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} |
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payload64 := base64.RawURLEncoding.EncodeToString(payload) |
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hash := sha256.Sum256([]byte(fmt.Sprintf( |
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`%s.%s`, |
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protected64, |
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payload64, |
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))) |
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sig := Sign(randsrc, privkey, hash[:]) |
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sig64 := base64.RawURLEncoding.EncodeToString(sig) |
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return &JWS{ |
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Header: header, |
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Claims: claims, |
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Protected: protected64, |
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Payload: payload64, |
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Signature: sig64, |
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}, nil |
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} |
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func headerToProtected(pub keypairs.PublicKey, header Object) ([]byte, error) { |
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if nil == header { |
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header = Object{} |
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} |
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// Only supporting 2048-bit and P256 keys right now
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// because that's all that's practical and well-supported.
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// No security theatre here.
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alg := "ES256" |
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switch pub.Key().(type) { |
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case *rsa.PublicKey: |
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alg = "RS256" |
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} |
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if selfSign, _ := header["_jwk"].(bool); selfSign { |
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delete(header, "_jwk") |
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any := Object{} |
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_ = json.Unmarshal(keypairs.MarshalJWKPublicKey(pub), &any) |
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header["jwk"] = any |
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} |
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// TODO what are the acceptable values? JWT. JWS? others?
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header["typ"] = "JWT" |
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if _, ok := header["jwk"]; !ok { |
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thumbprint := keypairs.ThumbprintPublicKey(pub) |
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kid, _ := header["kid"].(string) |
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if "" != kid && thumbprint != kid { |
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return nil, errors.New("'kid' should be the key's thumbprint") |
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} |
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header["kid"] = thumbprint |
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} |
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header["alg"] = alg |
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protected, err := json.Marshal(header) |
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if nil != err { |
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return nil, err |
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} |
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return protected, nil |
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} |
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func claimsToPayload(claims Object) ([]byte, error) { |
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if nil == claims { |
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claims = Object{} |
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} |
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jti, _ := claims["jti"].(string) |
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exp, _ := claims["exp"].(int64) |
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dur, _ := claims["exp"].(string) |
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insecure, _ := claims["insecure"].(bool) |
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// parse if exp is actually a duration, such as "15m"
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if 0 == exp && "" != dur { |
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s, err := ParseDuration(dur) |
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if nil != err { |
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return nil, err |
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} |
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exp = time.Now().Add(time.Duration(s) * time.Second).Unix() |
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claims["exp"] = exp |
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} |
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if "" == jti && 0 == exp && !insecure { |
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return nil, errors.New("token must have jti or exp as to be expirable / cancellable") |
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} |
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return json.Marshal(claims) |
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} |
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func JWSToJWT(jwt *JWS) string { |
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return fmt.Sprintf( |
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"%s.%s.%s", |
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jwt.Protected, |
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jwt.Payload, |
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jwt.Signature, |
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) |
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} |
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func Sign(rand io.Reader, privkey keypairs.PrivateKey, hash []byte) []byte { |
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var sig []byte |
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if len(hash) != 32 { |
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panic("only 256-bit hashes for 2048-bit and 256-bit keys are supported") |
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} |
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switch k := privkey.(type) { |
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case *rsa.PrivateKey: |
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sig, _ = rsa.SignPKCS1v15(rand, k, crypto.SHA256, hash) |
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case *ecdsa.PrivateKey: |
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r, s, _ := ecdsa.Sign(rand, k, hash[:]) |
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rb := r.Bytes() |
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fmt.Println("debug:") |
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fmt.Println(r, s) |
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for len(rb) < 32 { |
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rb = append([]byte{0}, rb...) |
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} |
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sb := s.Bytes() |
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for len(rb) < 32 { |
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sb = append([]byte{0}, sb...) |
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} |
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sig = append(rb, sb...) |
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} |
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return sig |
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} |
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