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v2signer.go
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v2signer.go
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// Copyright 2015 Ka-Hing Cheung
//
// 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 internal
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"errors"
"fmt"
"net/http"
"net/url"
"sort"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/request"
)
var (
errInvalidMethod = errors.New("v2 signer does not handle HTTP POST")
)
const (
signatureVersion = "2"
signatureMethod = "HmacSHA1"
timeFormat = "Mon, 2 Jan 2006 15:04:05 +0000"
)
var subresources = []string{
"acl",
"delete",
"lifecycle",
"location",
"logging",
"notification",
"partNumber",
"policy",
"requestPayment",
"torrent",
"uploadId",
"uploads",
"versionId",
"versioning",
"versions",
"website",
}
type signer struct {
// Values that must be populated from the request
Request *http.Request
Time time.Time
Credentials *credentials.Credentials
Debug aws.LogLevelType
Logger aws.Logger
pathStyle bool
bucket string
Query url.Values
stringToSign string
signature string
}
// Sign requests with signature version 2.
//
// Will sign the requests with the service config's Credentials object
// Signing is skipped if the credentials is the credentials.AnonymousCredentials
// object.
func SignV2(req *request.Request) {
// If the request does not need to be signed ignore the signing of the
// request if the AnonymousCredentials object is used.
if req.Config.Credentials == credentials.AnonymousCredentials {
return
}
v2 := signer{
Request: req.HTTPRequest,
Time: req.Time,
Credentials: req.Config.Credentials,
Debug: req.Config.LogLevel.Value(),
Logger: req.Config.Logger,
pathStyle: aws.BoolValue(req.Config.S3ForcePathStyle),
}
req.Error = v2.Sign()
}
func (v2 *signer) Sign() error {
credValue, err := v2.Credentials.Get()
if err != nil {
return err
}
v2.Query = v2.Request.URL.Query()
contentMD5 := v2.Request.Header.Get("Content-MD5")
contentType := v2.Request.Header.Get("Content-Type")
date := v2.Time.UTC().Format(timeFormat)
v2.Request.Header.Set("x-amz-date", date)
if credValue.SessionToken != "" {
v2.Request.Header.Set("x-amz-security-token", credValue.SessionToken)
}
// in case this is a retry, ensure no signature present
v2.Request.Header.Del("Authorization")
method := v2.Request.Method
uri := v2.Request.URL.Opaque
if uri != "" {
if questionMark := strings.Index(uri, "?"); questionMark != -1 {
uri = uri[0:questionMark]
}
uri = "/" + strings.Join(strings.Split(uri, "/")[3:], "/")
} else {
uri = v2.Request.URL.Path
}
path := uri
if !v2.pathStyle {
host := strings.SplitN(v2.Request.URL.Host, ".", 2)[0]
path = "/" + host + uri
}
if path == "" {
path = "/"
}
// build URL-encoded query keys and values
queryKeysAndValues := []string{}
for _, key := range subresources {
if _, ok := v2.Query[key]; ok {
k := strings.Replace(url.QueryEscape(key), "+", "%20", -1)
v := strings.Replace(url.QueryEscape(v2.Query.Get(key)), "+", "%20", -1)
if v != "" {
v = "=" + v
}
queryKeysAndValues = append(queryKeysAndValues, k+v)
}
}
// join into one query string
query := strings.Join(queryKeysAndValues, "&")
if query != "" {
path += "?" + query
}
tmp := []string{
method,
contentMD5,
contentType,
"",
}
var headers []string
for k := range v2.Request.Header {
k = strings.ToLower(k)
if strings.HasPrefix(k, "x-amz-") {
headers = append(headers, k)
}
}
sort.Strings(headers)
for _, k := range headers {
v := strings.Join(v2.Request.Header[http.CanonicalHeaderKey(k)], ",")
tmp = append(tmp, k+":"+v)
}
tmp = append(tmp, path)
// build the canonical string for the V2 signature
v2.stringToSign = strings.Join(tmp, "\n")
hash := hmac.New(sha1.New, []byte(credValue.SecretAccessKey))
hash.Write([]byte(v2.stringToSign))
v2.signature = base64.StdEncoding.EncodeToString(hash.Sum(nil))
v2.Request.Header.Set("Authorization",
"AWS "+credValue.AccessKeyID+":"+v2.signature)
if v2.Debug.Matches(aws.LogDebugWithSigning) {
v2.logSigningInfo()
}
return nil
}
const logSignInfoMsg = `DEBUG: Request Signature:
---[ STRING TO SIGN ]--------------------------------
%s
---[ SIGNATURE ]-------------------------------------
%s
-----------------------------------------------------`
func (v2 *signer) logSigningInfo() {
msg := fmt.Sprintf(logSignInfoMsg, v2.stringToSign, v2.Request.Header.Get("Authorization"))
v2.Logger.Log(msg)
}