Move all server and controller packages into top-level

server-api-signature.go

@@ -0,0 +1,121 @@
+/*
+ * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/minio/minio/pkg/auth"
+	"github.com/minio/minio/pkg/donut"
+	"github.com/minio/minio/pkg/probe"
+)
+
+const (
+	authHeaderPrefix = "AWS4-HMAC-SHA256"
+	iso8601Format    = "20060102T150405Z"
+	yyyymmdd         = "20060102"
+)
+
+// getCredentialsFromAuth parse credentials tag from authorization value
+func getCredentialsFromAuth(authValue string) ([]string, *probe.Error) {
+	if authValue == "" {
+		return nil, probe.NewError(errMissingAuthHeaderValue)
+	}
+	authFields := strings.Split(strings.TrimSpace(authValue), ",")
+	if len(authFields) != 3 {
+		return nil, probe.NewError(errInvalidAuthHeaderValue)
+	}
+	authPrefixFields := strings.Fields(authFields[0])
+	if len(authPrefixFields) != 2 {
+		return nil, probe.NewError(errMissingFieldsAuthHeader)
+	}
+	if authPrefixFields[0] != authHeaderPrefix {
+		return nil, probe.NewError(errInvalidAuthHeaderPrefix)
+	}
+	credentials := strings.Split(strings.TrimSpace(authPrefixFields[1]), "=")
+	if len(credentials) != 2 {
+		return nil, probe.NewError(errMissingFieldsCredentialTag)
+	}
+	if len(strings.Split(strings.TrimSpace(authFields[1]), "=")) != 2 {
+		return nil, probe.NewError(errMissingFieldsSignedHeadersTag)
+	}
+	if len(strings.Split(strings.TrimSpace(authFields[2]), "=")) != 2 {
+		return nil, probe.NewError(errMissingFieldsSignatureTag)
+	}
+	credentialElements := strings.Split(strings.TrimSpace(credentials[1]), "/")
+	if len(credentialElements) != 5 {
+		return nil, probe.NewError(errCredentialTagMalformed)
+	}
+	return credentialElements, nil
+}
+
+// verify if authHeader value has valid region
+func isValidRegion(authHeaderValue string) *probe.Error {
+	credentialElements, err := getCredentialsFromAuth(authHeaderValue)
+	if err != nil {
+		return err.Trace()
+	}
+	region := credentialElements[2]
+	if region != "milkyway" {
+		return probe.NewError(errInvalidRegion)
+	}
+	return nil
+}
+
+// stripAccessKeyID - strip only access key id from auth header
+func stripAccessKeyID(authHeaderValue string) (string, *probe.Error) {
+	if err := isValidRegion(authHeaderValue); err != nil {
+		return "", err.Trace()
+	}
+	credentialElements, err := getCredentialsFromAuth(authHeaderValue)
+	if err != nil {
+		return "", err.Trace()
+	}
+	accessKeyID := credentialElements[0]
+	if !auth.IsValidAccessKey(accessKeyID) {
+		return "", probe.NewError(errAccessKeyIDInvalid)
+	}
+	return accessKeyID, nil
+}
+
+// initSignatureV4 initializing signature verification
+func initSignatureV4(req *http.Request) (*donut.Signature, *probe.Error) {
+	// strip auth from authorization header
+	authHeaderValue := req.Header.Get("Authorization")
+	accessKeyID, err := stripAccessKeyID(authHeaderValue)
+	if err != nil {
+		return nil, err.Trace()
+	}
+	authConfig, err := auth.LoadConfig()
+	if err != nil {
+		return nil, err.Trace()
+	}
+	for _, user := range authConfig.Users {
+		if user.AccessKeyID == accessKeyID {
+			signature := &donut.Signature{
+				AccessKeyID:     user.AccessKeyID,
+				SecretAccessKey: user.SecretAccessKey,
+				AuthHeader:      authHeaderValue,
+				Request:         req,
+			}
+			return signature, nil
+		}
+	}
+	return nil, probe.NewError(errors.New("AccessKeyID not found"))
+}