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minio/pkg/api/api_signature.go

226 lines
5.8 KiB

/*
* Minimalist Object Storage, (C) 2014,2015 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 api
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"sort"
"strings"
"time"
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"net/http"
"net/url"
"github.com/minio-io/minio/pkg/api/config"
)
// SignRequest - a given http request using HMAC style signatures
func SignRequest(user config.User, req *http.Request) {
if date := req.Header.Get("Date"); date == "" {
req.Header.Set("Date", time.Now().UTC().Format(http.TimeFormat))
}
hm := hmac.New(sha1.New, []byte(user.SecretKey))
ss := getStringToSign(req)
io.WriteString(hm, ss)
authHeader := new(bytes.Buffer)
fmt.Fprintf(authHeader, "AWS %s:", user.AccessKey)
encoder := base64.NewEncoder(base64.StdEncoding, authHeader)
encoder.Write(hm.Sum(nil))
encoder.Close()
req.Header.Set("Authorization", authHeader.String())
}
// ValidateRequest - an API request by validating its signature using HMAC signatures
func ValidateRequest(user config.User, req *http.Request) (bool, error) {
// Verify if date headers are set, if not reject the request
if req.Header.Get("x-amz-date") == "" {
if req.Header.Get("Date") == "" {
return false, errors.New("Date should be set")
}
}
hm := hmac.New(sha1.New, []byte(user.SecretKey))
ss := getStringToSign(req)
io.WriteString(hm, ss)
authHeader := new(bytes.Buffer)
fmt.Fprintf(authHeader, "AWS %s:", user.AccessKey)
encoder := base64.NewEncoder(base64.StdEncoding, authHeader)
encoder.Write(hm.Sum(nil))
encoder.Close()
// DEBUG
// fmt.Println("Request header sent: ", req.Header.Get("Authorization"))
// fmt.Println("Header calculated: ", authHeader.String())
// fmt.Printf("%q : %x", ss, ss)
if req.Header.Get("Authorization") != authHeader.String() {
return false, errors.New("Authorization header mismatch")
}
return true, nil
}
// From the Amazon docs:
//
// StringToSign = HTTP-Verb + "\n" +
// Content-MD5 + "\n" +
// Content-Type + "\n" +
// Date + "\n" +
// CanonicalizedAmzHeaders +
// CanonicalizedResource;
func getStringToSign(req *http.Request) string {
buf := new(bytes.Buffer)
buf.WriteString(req.Method)
buf.WriteByte('\n')
buf.WriteString(req.Header.Get("Content-MD5"))
buf.WriteByte('\n')
buf.WriteString(req.Header.Get("Content-Type"))
buf.WriteByte('\n')
if req.Header.Get("x-amz-date") == "" {
buf.WriteString(req.Header.Get("Date"))
}
buf.WriteByte('\n')
writeCanonicalizedAmzHeaders(buf, req)
writeCanonicalizedResource(buf, req)
return buf.String()
}
// Lower all upper case letters
func hasPrefixCaseInsensitive(s, pfx string) bool {
if len(pfx) > len(s) {
return false
}
shead := s[:len(pfx)]
if shead == pfx {
return true
}
shead = strings.ToLower(shead)
return shead == pfx || shead == strings.ToLower(pfx)
}
// Canonicalize amazon special headers, headers starting with 'x-amz-'
func writeCanonicalizedAmzHeaders(buf *bytes.Buffer, req *http.Request) {
var amzHeaders []string
vals := make(map[string][]string)
for k, vv := range req.Header {
if hasPrefixCaseInsensitive(k, "x-amz-") {
lk := strings.ToLower(k)
amzHeaders = append(amzHeaders, lk)
vals[lk] = vv
}
}
sort.Strings(amzHeaders)
for _, k := range amzHeaders {
buf.WriteString(k)
buf.WriteByte(':')
for idx, v := range vals[k] {
if idx > 0 {
buf.WriteByte(',')
}
if strings.Contains(v, "\n") {
// TODO: "Unfold" long headers that
// span multiple lines (as allowed by
// RFC 2616, section 4.2) by replacing
// the folding white-space (including
// new-line) by a single space.
buf.WriteString(v)
} else {
buf.WriteString(v)
}
}
buf.WriteByte('\n')
}
}
// Resource list must be sorted:
var subResList = []string{
"acl",
"location",
"logging",
"notification",
"partNumber",
"policy",
"uploadId",
"uploads",
"response-content-type",
"response-content-language",
"response-content-disposition",
"response-content-encoding",
"website",
}
// From the Amazon docs:
//
// CanonicalizedResource = [ "/" + Bucket ] +
// <HTTP-Request-URI, from the protocol name up to the query string> +
// [ sub-resource, if present. For example "?acl", "?location", "?logging", or "?torrent"];
func writeCanonicalizedResource(buf *bytes.Buffer, req *http.Request) {
// Grab bucket name from hostname
bucket := bucketFromHostname(req)
if bucket != "" {
buf.WriteByte('/')
buf.WriteString(bucket)
}
buf.WriteString(req.URL.Path)
sort.Strings(subResList)
if req.URL.RawQuery != "" {
n := 0
vals, _ := url.ParseQuery(req.URL.RawQuery)
for _, subres := range subResList {
if vv, ok := vals[subres]; ok && len(vv) > 0 {
n++
if n == 1 {
buf.WriteByte('?')
} else {
buf.WriteByte('&')
}
buf.WriteString(subres)
if len(vv[0]) > 0 {
buf.WriteByte('=')
buf.WriteString(url.QueryEscape(vv[0]))
}
}
}
}
}
// Convert subdomain http request into bucketname if possible
func bucketFromHostname(req *http.Request) string {
host, _, _ := net.SplitHostPort(req.Host)
// Verify incoming request if only IP with no bucket subdomain
if net.ParseIP(host) != nil {
return ""
}
if host == "" {
host = req.URL.Host
}
// Grab the bucket from the incoming hostname
host = strings.TrimSpace(host)
hostParts := strings.Split(host, ".")
if len(hostParts) > 2 {
return hostParts[0]
}
return ""
}