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S3 gateway signature probe use a unique bucket (#6190)

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This fixes an issue because someone is
using `probe-bucket-sign` bucket name in
region 'eu-central-1'
This commit is contained in:
Harshavardhana 2018-07-23 10:16:56 -07:00 committed by kannappanr
parent 2cd14f567c
commit 5acc2a6db1
1 changed files with 30 additions and 3 deletions
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33
cmd/gateway/s3/gateway-s3.go
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@ -20,7 +20,9 @@ import (
"context"
"encoding/json"
"io"
"math/rand"
"strings"
"time"
"github.com/minio/cli"
miniogo "github.com/minio/minio-go"
@ -121,6 +123,31 @@ func (g *S3) Name() string {
return s3Backend
}
const letterBytes = "abcdefghijklmnopqrstuvwxyz01234569"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
)
// randString generates random names and prepends them with a known prefix.
func randString(n int, src rand.Source, prefix string) string {
b := make([]byte, n)
// A rand.Int63() generates 63 random bits, enough for letterIdxMax letters!
for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return prefix + string(b[0:30-len(prefix)])
}
// newS3 - Initializes a new client by auto probing S3 server signature.
func newS3(url, accessKey, secretKey string) (*miniogo.Core, error) {
if url == "" {
@ -137,13 +164,13 @@ func newS3(url, accessKey, secretKey string) (*miniogo.Core, error) {
if err != nil {
return nil, err
}
if _, err = clnt.BucketExists("probe-bucket-sign"); err != nil {
probeBucketName := randString(60, rand.NewSource(time.Now().UnixNano()), "probe-bucket-sign-")
if _, err = clnt.BucketExists(probeBucketName); err != nil {
clnt, err = miniogo.NewV2(endpoint, accessKey, secretKey, secure)
if err != nil {
return nil, err
}
if _, err = clnt.BucketExists("probe-bucket-sign"); err != nil {
if _, err = clnt.BucketExists(probeBucketName); err != nil {
return nil, err
}
}