diff options
Diffstat (limited to 'vendor/github.com/docker/libtrust/jsonsign.go')
| -rw-r--r-- | vendor/github.com/docker/libtrust/jsonsign.go | 657 |
1 files changed, 0 insertions, 657 deletions
diff --git a/vendor/github.com/docker/libtrust/jsonsign.go b/vendor/github.com/docker/libtrust/jsonsign.go deleted file mode 100644 index cb2ca9a76..000000000 --- a/vendor/github.com/docker/libtrust/jsonsign.go +++ /dev/null @@ -1,657 +0,0 @@ -package libtrust - -import ( - "bytes" - "crypto" - "crypto/x509" - "encoding/base64" - "encoding/json" - "errors" - "fmt" - "sort" - "time" - "unicode" -) - -var ( - // ErrInvalidSignContent is used when the content to be signed is invalid. - ErrInvalidSignContent = errors.New("invalid sign content") - - // ErrInvalidJSONContent is used when invalid json is encountered. - ErrInvalidJSONContent = errors.New("invalid json content") - - // ErrMissingSignatureKey is used when the specified signature key - // does not exist in the JSON content. - ErrMissingSignatureKey = errors.New("missing signature key") -) - -type jsHeader struct { - JWK PublicKey `json:"jwk,omitempty"` - Algorithm string `json:"alg"` - Chain []string `json:"x5c,omitempty"` -} - -type jsSignature struct { - Header jsHeader `json:"header"` - Signature string `json:"signature"` - Protected string `json:"protected,omitempty"` -} - -type jsSignaturesSorted []jsSignature - -func (jsbkid jsSignaturesSorted) Swap(i, j int) { jsbkid[i], jsbkid[j] = jsbkid[j], jsbkid[i] } -func (jsbkid jsSignaturesSorted) Len() int { return len(jsbkid) } - -func (jsbkid jsSignaturesSorted) Less(i, j int) bool { - ki, kj := jsbkid[i].Header.JWK.KeyID(), jsbkid[j].Header.JWK.KeyID() - si, sj := jsbkid[i].Signature, jsbkid[j].Signature - - if ki == kj { - return si < sj - } - - return ki < kj -} - -type signKey struct { - PrivateKey - Chain []*x509.Certificate -} - -// JSONSignature represents a signature of a json object. -type JSONSignature struct { - payload string - signatures []jsSignature - indent string - formatLength int - formatTail []byte -} - -func newJSONSignature() *JSONSignature { - return &JSONSignature{ - signatures: make([]jsSignature, 0, 1), - } -} - -// Payload returns the encoded payload of the signature. This -// payload should not be signed directly -func (js *JSONSignature) Payload() ([]byte, error) { - return joseBase64UrlDecode(js.payload) -} - -func (js *JSONSignature) protectedHeader() (string, error) { - protected := map[string]interface{}{ - "formatLength": js.formatLength, - "formatTail": joseBase64UrlEncode(js.formatTail), - "time": time.Now().UTC().Format(time.RFC3339), - } - protectedBytes, err := json.Marshal(protected) - if err != nil { - return "", err - } - - return joseBase64UrlEncode(protectedBytes), nil -} - -func (js *JSONSignature) signBytes(protectedHeader string) ([]byte, error) { - buf := make([]byte, len(js.payload)+len(protectedHeader)+1) - copy(buf, protectedHeader) - buf[len(protectedHeader)] = '.' - copy(buf[len(protectedHeader)+1:], js.payload) - return buf, nil -} - -// Sign adds a signature using the given private key. -func (js *JSONSignature) Sign(key PrivateKey) error { - protected, err := js.protectedHeader() - if err != nil { - return err - } - signBytes, err := js.signBytes(protected) - if err != nil { - return err - } - sigBytes, algorithm, err := key.Sign(bytes.NewReader(signBytes), crypto.SHA256) - if err != nil { - return err - } - - js.signatures = append(js.signatures, jsSignature{ - Header: jsHeader{ - JWK: key.PublicKey(), - Algorithm: algorithm, - }, - Signature: joseBase64UrlEncode(sigBytes), - Protected: protected, - }) - - return nil -} - -// SignWithChain adds a signature using the given private key -// and setting the x509 chain. The public key of the first element -// in the chain must be the public key corresponding with the sign key. -func (js *JSONSignature) SignWithChain(key PrivateKey, chain []*x509.Certificate) error { - // Ensure key.Chain[0] is public key for key - //key.Chain.PublicKey - //key.PublicKey().CryptoPublicKey() - - // Verify chain - protected, err := js.protectedHeader() - if err != nil { - return err - } - signBytes, err := js.signBytes(protected) - if err != nil { - return err - } - sigBytes, algorithm, err := key.Sign(bytes.NewReader(signBytes), crypto.SHA256) - if err != nil { - return err - } - - header := jsHeader{ - Chain: make([]string, len(chain)), - Algorithm: algorithm, - } - - for i, cert := range chain { - header.Chain[i] = base64.StdEncoding.EncodeToString(cert.Raw) - } - - js.signatures = append(js.signatures, jsSignature{ - Header: header, - Signature: joseBase64UrlEncode(sigBytes), - Protected: protected, - }) - - return nil -} - -// Verify verifies all the signatures and returns the list of -// public keys used to sign. Any x509 chains are not checked. -func (js *JSONSignature) Verify() ([]PublicKey, error) { - keys := make([]PublicKey, len(js.signatures)) - for i, signature := range js.signatures { - signBytes, err := js.signBytes(signature.Protected) - if err != nil { - return nil, err - } - var publicKey PublicKey - if len(signature.Header.Chain) > 0 { - certBytes, err := base64.StdEncoding.DecodeString(signature.Header.Chain[0]) - if err != nil { - return nil, err - } - cert, err := x509.ParseCertificate(certBytes) - if err != nil { - return nil, err - } - publicKey, err = FromCryptoPublicKey(cert.PublicKey) - if err != nil { - return nil, err - } - } else if signature.Header.JWK != nil { - publicKey = signature.Header.JWK - } else { - return nil, errors.New("missing public key") - } - - sigBytes, err := joseBase64UrlDecode(signature.Signature) - if err != nil { - return nil, err - } - - err = publicKey.Verify(bytes.NewReader(signBytes), signature.Header.Algorithm, sigBytes) - if err != nil { - return nil, err - } - - keys[i] = publicKey - } - return keys, nil -} - -// VerifyChains verifies all the signatures and the chains associated -// with each signature and returns the list of verified chains. -// Signatures without an x509 chain are not checked. -func (js *JSONSignature) VerifyChains(ca *x509.CertPool) ([][]*x509.Certificate, error) { - chains := make([][]*x509.Certificate, 0, len(js.signatures)) - for _, signature := range js.signatures { - signBytes, err := js.signBytes(signature.Protected) - if err != nil { - return nil, err - } - var publicKey PublicKey - if len(signature.Header.Chain) > 0 { - certBytes, err := base64.StdEncoding.DecodeString(signature.Header.Chain[0]) - if err != nil { - return nil, err - } - cert, err := x509.ParseCertificate(certBytes) - if err != nil { - return nil, err - } - publicKey, err = FromCryptoPublicKey(cert.PublicKey) - if err != nil { - return nil, err - } - intermediates := x509.NewCertPool() - if len(signature.Header.Chain) > 1 { - intermediateChain := signature.Header.Chain[1:] - for i := range intermediateChain { - certBytes, err := base64.StdEncoding.DecodeString(intermediateChain[i]) - if err != nil { - return nil, err - } - intermediate, err := x509.ParseCertificate(certBytes) - if err != nil { - return nil, err - } - intermediates.AddCert(intermediate) - } - } - - verifyOptions := x509.VerifyOptions{ - Intermediates: intermediates, - Roots: ca, - } - - verifiedChains, err := cert.Verify(verifyOptions) - if err != nil { - return nil, err - } - chains = append(chains, verifiedChains...) - - sigBytes, err := joseBase64UrlDecode(signature.Signature) - if err != nil { - return nil, err - } - - err = publicKey.Verify(bytes.NewReader(signBytes), signature.Header.Algorithm, sigBytes) - if err != nil { - return nil, err - } - } - - } - return chains, nil -} - -// JWS returns JSON serialized JWS according to -// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-7.2 -func (js *JSONSignature) JWS() ([]byte, error) { - if len(js.signatures) == 0 { - return nil, errors.New("missing signature") - } - - sort.Sort(jsSignaturesSorted(js.signatures)) - - jsonMap := map[string]interface{}{ - "payload": js.payload, - "signatures": js.signatures, - } - - return json.MarshalIndent(jsonMap, "", " ") -} - -func notSpace(r rune) bool { - return !unicode.IsSpace(r) -} - -func detectJSONIndent(jsonContent []byte) (indent string) { - if len(jsonContent) > 2 && jsonContent[0] == '{' && jsonContent[1] == '\n' { - quoteIndex := bytes.IndexRune(jsonContent[1:], '"') - if quoteIndex > 0 { - indent = string(jsonContent[2 : quoteIndex+1]) - } - } - return -} - -type jsParsedHeader struct { - JWK json.RawMessage `json:"jwk"` - Algorithm string `json:"alg"` - Chain []string `json:"x5c"` -} - -type jsParsedSignature struct { - Header jsParsedHeader `json:"header"` - Signature string `json:"signature"` - Protected string `json:"protected"` -} - -// ParseJWS parses a JWS serialized JSON object into a Json Signature. -func ParseJWS(content []byte) (*JSONSignature, error) { - type jsParsed struct { - Payload string `json:"payload"` - Signatures []jsParsedSignature `json:"signatures"` - } - parsed := &jsParsed{} - err := json.Unmarshal(content, parsed) - if err != nil { - return nil, err - } - if len(parsed.Signatures) == 0 { - return nil, errors.New("missing signatures") - } - payload, err := joseBase64UrlDecode(parsed.Payload) - if err != nil { - return nil, err - } - - js, err := NewJSONSignature(payload) - if err != nil { - return nil, err - } - js.signatures = make([]jsSignature, len(parsed.Signatures)) - for i, signature := range parsed.Signatures { - header := jsHeader{ - Algorithm: signature.Header.Algorithm, - } - if signature.Header.Chain != nil { - header.Chain = signature.Header.Chain - } - if signature.Header.JWK != nil { - publicKey, err := UnmarshalPublicKeyJWK([]byte(signature.Header.JWK)) - if err != nil { - return nil, err - } - header.JWK = publicKey - } - js.signatures[i] = jsSignature{ - Header: header, - Signature: signature.Signature, - Protected: signature.Protected, - } - } - - return js, nil -} - -// NewJSONSignature returns a new unsigned JWS from a json byte array. -// JSONSignature will need to be signed before serializing or storing. -// Optionally, one or more signatures can be provided as byte buffers, -// containing serialized JWS signatures, to assemble a fully signed JWS -// package. It is the callers responsibility to ensure uniqueness of the -// provided signatures. -func NewJSONSignature(content []byte, signatures ...[]byte) (*JSONSignature, error) { - var dataMap map[string]interface{} - err := json.Unmarshal(content, &dataMap) - if err != nil { - return nil, err - } - - js := newJSONSignature() - js.indent = detectJSONIndent(content) - - js.payload = joseBase64UrlEncode(content) - - // Find trailing } and whitespace, put in protected header - closeIndex := bytes.LastIndexFunc(content, notSpace) - if content[closeIndex] != '}' { - return nil, ErrInvalidJSONContent - } - lastRuneIndex := bytes.LastIndexFunc(content[:closeIndex], notSpace) - if content[lastRuneIndex] == ',' { - return nil, ErrInvalidJSONContent - } - js.formatLength = lastRuneIndex + 1 - js.formatTail = content[js.formatLength:] - - if len(signatures) > 0 { - for _, signature := range signatures { - var parsedJSig jsParsedSignature - - if err := json.Unmarshal(signature, &parsedJSig); err != nil { - return nil, err - } - - // TODO(stevvooe): A lot of the code below is repeated in - // ParseJWS. It will require more refactoring to fix that. - jsig := jsSignature{ - Header: jsHeader{ - Algorithm: parsedJSig.Header.Algorithm, - }, - Signature: parsedJSig.Signature, - Protected: parsedJSig.Protected, - } - - if parsedJSig.Header.Chain != nil { - jsig.Header.Chain = parsedJSig.Header.Chain - } - - if parsedJSig.Header.JWK != nil { - publicKey, err := UnmarshalPublicKeyJWK([]byte(parsedJSig.Header.JWK)) - if err != nil { - return nil, err - } - jsig.Header.JWK = publicKey - } - - js.signatures = append(js.signatures, jsig) - } - } - - return js, nil -} - -// NewJSONSignatureFromMap returns a new unsigned JSONSignature from a map or -// struct. JWS will need to be signed before serializing or storing. -func NewJSONSignatureFromMap(content interface{}) (*JSONSignature, error) { - switch content.(type) { - case map[string]interface{}: - case struct{}: - default: - return nil, errors.New("invalid data type") - } - - js := newJSONSignature() - js.indent = " " - - payload, err := json.MarshalIndent(content, "", js.indent) - if err != nil { - return nil, err - } - js.payload = joseBase64UrlEncode(payload) - - // Remove '\n}' from formatted section, put in protected header - js.formatLength = len(payload) - 2 - js.formatTail = payload[js.formatLength:] - - return js, nil -} - -func readIntFromMap(key string, m map[string]interface{}) (int, bool) { - value, ok := m[key] - if !ok { - return 0, false - } - switch v := value.(type) { - case int: - return v, true - case float64: - return int(v), true - default: - return 0, false - } -} - -func readStringFromMap(key string, m map[string]interface{}) (v string, ok bool) { - value, ok := m[key] - if !ok { - return "", false - } - v, ok = value.(string) - return -} - -// ParsePrettySignature parses a formatted signature into a -// JSON signature. If the signatures are missing the format information -// an error is thrown. The formatted signature must be created by -// the same method as format signature. -func ParsePrettySignature(content []byte, signatureKey string) (*JSONSignature, error) { - var contentMap map[string]json.RawMessage - err := json.Unmarshal(content, &contentMap) - if err != nil { - return nil, fmt.Errorf("error unmarshalling content: %s", err) - } - sigMessage, ok := contentMap[signatureKey] - if !ok { - return nil, ErrMissingSignatureKey - } - - var signatureBlocks []jsParsedSignature - err = json.Unmarshal([]byte(sigMessage), &signatureBlocks) - if err != nil { - return nil, fmt.Errorf("error unmarshalling signatures: %s", err) - } - - js := newJSONSignature() - js.signatures = make([]jsSignature, len(signatureBlocks)) - - for i, signatureBlock := range signatureBlocks { - protectedBytes, err := joseBase64UrlDecode(signatureBlock.Protected) - if err != nil { - return nil, fmt.Errorf("base64 decode error: %s", err) - } - var protectedHeader map[string]interface{} - err = json.Unmarshal(protectedBytes, &protectedHeader) - if err != nil { - return nil, fmt.Errorf("error unmarshalling protected header: %s", err) - } - - formatLength, ok := readIntFromMap("formatLength", protectedHeader) - if !ok { - return nil, errors.New("missing formatted length") - } - encodedTail, ok := readStringFromMap("formatTail", protectedHeader) - if !ok { - return nil, errors.New("missing formatted tail") - } - formatTail, err := joseBase64UrlDecode(encodedTail) - if err != nil { - return nil, fmt.Errorf("base64 decode error on tail: %s", err) - } - if js.formatLength == 0 { - js.formatLength = formatLength - } else if js.formatLength != formatLength { - return nil, errors.New("conflicting format length") - } - if len(js.formatTail) == 0 { - js.formatTail = formatTail - } else if bytes.Compare(js.formatTail, formatTail) != 0 { - return nil, errors.New("conflicting format tail") - } - - header := jsHeader{ - Algorithm: signatureBlock.Header.Algorithm, - Chain: signatureBlock.Header.Chain, - } - if signatureBlock.Header.JWK != nil { - publicKey, err := UnmarshalPublicKeyJWK([]byte(signatureBlock.Header.JWK)) - if err != nil { - return nil, fmt.Errorf("error unmarshalling public key: %s", err) - } - header.JWK = publicKey - } - js.signatures[i] = jsSignature{ - Header: header, - Signature: signatureBlock.Signature, - Protected: signatureBlock.Protected, - } - } - if js.formatLength > len(content) { - return nil, errors.New("invalid format length") - } - formatted := make([]byte, js.formatLength+len(js.formatTail)) - copy(formatted, content[:js.formatLength]) - copy(formatted[js.formatLength:], js.formatTail) - js.indent = detectJSONIndent(formatted) - js.payload = joseBase64UrlEncode(formatted) - - return js, nil -} - -// PrettySignature formats a json signature into an easy to read -// single json serialized object. -func (js *JSONSignature) PrettySignature(signatureKey string) ([]byte, error) { - if len(js.signatures) == 0 { - return nil, errors.New("no signatures") - } - payload, err := joseBase64UrlDecode(js.payload) - if err != nil { - return nil, err - } - payload = payload[:js.formatLength] - - sort.Sort(jsSignaturesSorted(js.signatures)) - - var marshalled []byte - var marshallErr error - if js.indent != "" { - marshalled, marshallErr = json.MarshalIndent(js.signatures, js.indent, js.indent) - } else { - marshalled, marshallErr = json.Marshal(js.signatures) - } - if marshallErr != nil { - return nil, marshallErr - } - - buf := bytes.NewBuffer(make([]byte, 0, len(payload)+len(marshalled)+34)) - buf.Write(payload) - buf.WriteByte(',') - if js.indent != "" { - buf.WriteByte('\n') - buf.WriteString(js.indent) - buf.WriteByte('"') - buf.WriteString(signatureKey) - buf.WriteString("\": ") - buf.Write(marshalled) - buf.WriteByte('\n') - } else { - buf.WriteByte('"') - buf.WriteString(signatureKey) - buf.WriteString("\":") - buf.Write(marshalled) - } - buf.WriteByte('}') - - return buf.Bytes(), nil -} - -// Signatures provides the signatures on this JWS as opaque blobs, sorted by -// keyID. These blobs can be stored and reassembled with payloads. Internally, -// they are simply marshaled json web signatures but implementations should -// not rely on this. -func (js *JSONSignature) Signatures() ([][]byte, error) { - sort.Sort(jsSignaturesSorted(js.signatures)) - - var sb [][]byte - for _, jsig := range js.signatures { - p, err := json.Marshal(jsig) - if err != nil { - return nil, err - } - - sb = append(sb, p) - } - - return sb, nil -} - -// Merge combines the signatures from one or more other signatures into the -// method receiver. If the payloads differ for any argument, an error will be -// returned and the receiver will not be modified. -func (js *JSONSignature) Merge(others ...*JSONSignature) error { - merged := js.signatures - for _, other := range others { - if js.payload != other.payload { - return fmt.Errorf("payloads differ from merge target") - } - merged = append(merged, other.signatures...) - } - - js.signatures = merged - return nil -} |