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sig.go
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sig.go
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package sig
import (
"crypto/hmac"
"encoding/hex"
"errors"
"fmt"
"net/http"
"regexp"
"strings"
"unicode/utf8"
"github.com/treeverse/lakefs/pkg/auth/model"
gwErrors "github.com/treeverse/lakefs/pkg/gateway/errors"
)
var (
ErrHeaderMalformed = errors.New("header malformed")
// if object matches reserved string, no need to encode them
reservedObjectNames = regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
)
// taken from https://github.com/minio/minio-go/blob/master/pkg/s3utils/utils.go
/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2015-2017 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.
*/
// EncodePath encode the strings from UTF-8 byte representations to HTML hex escape sequences
// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
// non english characters cannot be parsed due to the nature in which url.Encode() is written
// This function on the other hand is a direct replacement for url.Encode() technique to support
// pretty much every UTF-8 character.
func EncodePath(pathName string) string {
if reservedObjectNames.MatchString(pathName) {
return pathName
}
var encodedPathname string
for _, s := range pathName {
if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
encodedPathname += string(s)
continue
}
switch s {
case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
encodedPathname += string(s)
continue
default:
runeLen := utf8.RuneLen(s)
if runeLen < 0 {
// if utf8 cannot convert return the same string as is
return pathName
}
u := make([]byte, runeLen)
utf8.EncodeRune(u, s)
for _, r := range u {
h := hex.EncodeToString([]byte{r})
encodedPathname += "%" + strings.ToUpper(h)
}
}
}
return encodedPathname
}
type SigContext interface {
GetAccessKeyID() string
}
type SigAuthenticator interface {
Parse() (SigContext, error)
Verify(*model.Credential, string) error
}
type chainedAuthenticator struct {
methods []SigAuthenticator
chosen SigAuthenticator
}
func ChainedAuthenticator(methods ...SigAuthenticator) SigAuthenticator {
return &chainedAuthenticator{methods, nil}
}
func (c *chainedAuthenticator) Parse() (SigContext, error) {
for _, method := range c.methods {
ctx, err := method.Parse()
if err == nil {
c.chosen = method
return ctx, nil
}
}
return nil, gwErrors.ErrMissingFields
}
func Equal(sig1, sig2 []byte) bool {
return hmac.Equal(sig1, sig2)
}
func (c *chainedAuthenticator) Verify(creds *model.Credential, fqdn string) error {
return c.chosen.Verify(creds, fqdn)
}
func (c *chainedAuthenticator) String() string {
if c.chosen == nil {
return "chained authenticator"
}
return fmt.Sprintf("%s", c.chosen)
}
func IsAWSSignedRequest(req *http.Request) bool {
// headers first
headers := req.Header
v4Value := headers.Get(v4SignatureHeader)
if len(v4Value) > 0 {
return true
}
v4AuthHeader := headers.Get(V4authHeaderName)
if strings.HasPrefix(v4AuthHeader, "AWS4") {
return true
}
v2Value := headers.Get(v2authHeaderName)
if strings.HasPrefix(v2Value, "AWS ") {
return true
}
// then request params
queryParams := req.URL.Query()
// sigv2: https://docs.aws.amazon.com/general/latest/gr/signature-version-2.html
if len(queryParams.Get("AWSAccessKeyId")) > 0 {
return true
}
// sigv4: https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html
if len(queryParams.Get("X-Amz-Credential")) > 0 {
return true
}
return false
}