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auth.go
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auth.go
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// Copyright 2019 Huawei Technologies Co.,Ltd.
// 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 obs
import (
"fmt"
"net/url"
"sort"
"strings"
"time"
)
func setURLWithPolicy(bucketName, canonicalizedUrl string) string {
if strings.HasPrefix(canonicalizedUrl, "/"+bucketName+"/") {
canonicalizedUrl = canonicalizedUrl[len("/"+bucketName+"/"):]
} else if strings.HasPrefix(canonicalizedUrl, "/"+bucketName) {
canonicalizedUrl = canonicalizedUrl[len("/"+bucketName):]
}
return canonicalizedUrl
}
func (obsClient ObsClient) doAuthTemporary(method, bucketName, objectKey string, policy string, params map[string]string,
headers map[string][]string, expires int64) (requestURL string, err error) {
sh := obsClient.getSecurity()
isAkSkEmpty := sh.ak == "" || sh.sk == ""
if isAkSkEmpty == false && sh.securityToken != "" {
if obsClient.conf.signature == SignatureObs {
params[HEADER_STS_TOKEN_OBS] = sh.securityToken
} else {
params[HEADER_STS_TOKEN_AMZ] = sh.securityToken
}
}
if policy != "" {
objectKey = ""
}
requestURL, canonicalizedURL := obsClient.conf.formatUrls(bucketName, objectKey, params, true)
parsedRequestURL, err := url.Parse(requestURL)
if err != nil {
return "", err
}
encodeHeaders(headers)
hostName := parsedRequestURL.Host
isV4 := obsClient.conf.signature == SignatureV4
prepareHostAndDate(headers, hostName, isV4)
if isAkSkEmpty {
doLog(LEVEL_WARN, "No ak/sk provided, skip to construct authorization")
} else {
if isV4 {
date, parseDateErr := time.Parse(RFC1123_FORMAT, headers[HEADER_DATE_CAMEL][0])
if parseDateErr != nil {
doLog(LEVEL_WARN, "Failed to parse date with reason: %v", parseDateErr)
return "", parseDateErr
}
delete(headers, HEADER_DATE_CAMEL)
shortDate := date.Format(SHORT_DATE_FORMAT)
longDate := date.Format(LONG_DATE_FORMAT)
if len(headers[HEADER_HOST_CAMEL]) != 0 {
index := strings.LastIndex(headers[HEADER_HOST_CAMEL][0], ":")
if index != -1 {
port := headers[HEADER_HOST_CAMEL][0][index+1:]
if port == "80" || port == "443" {
headers[HEADER_HOST_CAMEL] = []string{headers[HEADER_HOST_CAMEL][0][:index]}
}
}
}
signedHeaders, _headers := getSignedHeaders(headers)
credential, scope := getCredential(sh.ak, obsClient.conf.region, shortDate)
params[PARAM_ALGORITHM_AMZ_CAMEL] = V4_HASH_PREFIX
params[PARAM_CREDENTIAL_AMZ_CAMEL] = credential
params[PARAM_DATE_AMZ_CAMEL] = longDate
params[PARAM_EXPIRES_AMZ_CAMEL] = Int64ToString(expires)
params[PARAM_SIGNEDHEADERS_AMZ_CAMEL] = strings.Join(signedHeaders, ";")
requestURL, canonicalizedURL = obsClient.conf.formatUrls(bucketName, objectKey, params, true)
parsedRequestURL, _err := url.Parse(requestURL)
if _err != nil {
return "", _err
}
stringToSign := getV4StringToSign(method, canonicalizedURL, parsedRequestURL.RawQuery, scope, longDate, UNSIGNED_PAYLOAD, signedHeaders, _headers)
signature := getSignature(stringToSign, sh.sk, obsClient.conf.region, shortDate)
requestURL += fmt.Sprintf("&%s=%s", PARAM_SIGNATURE_AMZ_CAMEL, UrlEncode(signature, false))
} else {
originDate := headers[HEADER_DATE_CAMEL][0]
date, parseDateErr := time.Parse(RFC1123_FORMAT, originDate)
if parseDateErr != nil {
doLog(LEVEL_WARN, "Failed to parse date with reason: %v", parseDateErr)
return "", parseDateErr
}
expires += date.Unix()
if policy == "" {
headers[HEADER_DATE_CAMEL] = []string{Int64ToString(expires)}
} else {
policy = Base64Encode([]byte(policy))
headers[HEADER_DATE_CAMEL] = []string{policy}
canonicalizedURL = setURLWithPolicy(bucketName, canonicalizedURL)
}
stringToSign := getV2StringToSign(method, canonicalizedURL, headers, obsClient.conf.signature == SignatureObs)
signature := UrlEncode(Base64Encode(HmacSha1([]byte(sh.sk), []byte(stringToSign))), false)
if strings.Index(requestURL, "?") < 0 {
requestURL += "?"
} else {
requestURL += "&"
}
delete(headers, HEADER_DATE_CAMEL)
if obsClient.conf.signature != SignatureObs {
requestURL += "AWS"
}
if policy == "" {
requestURL += fmt.Sprintf("AccessKeyId=%s&Expires=%d&Signature=%s", UrlEncode(sh.ak, false),
expires, signature)
return
}
requestURL += fmt.Sprintf("AccessKeyId=%s&Policy=%s&Signature=%s", UrlEncode(sh.ak, false),
UrlEncode(policy, false), signature)
}
}
return
}
func (obsClient ObsClient) doAuth(method, bucketName, objectKey string, params map[string]string,
headers map[string][]string, hostName string) (requestURL string, err error) {
sh := obsClient.getSecurity()
isAkSkEmpty := sh.ak == "" || sh.sk == ""
if isAkSkEmpty == false && sh.securityToken != "" {
if obsClient.conf.signature == SignatureObs {
headers[HEADER_STS_TOKEN_OBS] = []string{sh.securityToken}
} else {
headers[HEADER_STS_TOKEN_AMZ] = []string{sh.securityToken}
}
}
isObs := obsClient.conf.signature == SignatureObs
requestURL, canonicalizedURL := obsClient.conf.formatUrls(bucketName, objectKey, params, true)
parsedRequestURL, err := url.Parse(requestURL)
if err != nil {
return "", err
}
encodeHeaders(headers)
if hostName == "" {
hostName = parsedRequestURL.Host
}
isV4 := obsClient.conf.signature == SignatureV4
prepareHostAndDate(headers, hostName, isV4)
if isAkSkEmpty {
doLog(LEVEL_WARN, "No ak/sk provided, skip to construct authorization")
} else {
ak := sh.ak
sk := sh.sk
var authorization string
if isV4 {
headers[HEADER_CONTENT_SHA256_AMZ] = []string{UNSIGNED_PAYLOAD}
ret := v4Auth(ak, sk, obsClient.conf.region, method, canonicalizedURL, parsedRequestURL.RawQuery, headers)
authorization = fmt.Sprintf("%s Credential=%s,SignedHeaders=%s,Signature=%s", V4_HASH_PREFIX, ret["Credential"], ret["SignedHeaders"], ret["Signature"])
} else {
ret := v2Auth(ak, sk, method, canonicalizedURL, headers, isObs)
hashPrefix := V2_HASH_PREFIX
if isObs {
hashPrefix = OBS_HASH_PREFIX
}
authorization = fmt.Sprintf("%s %s:%s", hashPrefix, ak, ret["Signature"])
}
headers[HEADER_AUTH_CAMEL] = []string{authorization}
}
return
}
func prepareHostAndDate(headers map[string][]string, hostName string, isV4 bool) {
headers[HEADER_HOST_CAMEL] = []string{hostName}
if date, ok := headers[HEADER_DATE_AMZ]; ok {
flag := false
if len(date) == 1 {
if isV4 {
if t, err := time.Parse(LONG_DATE_FORMAT, date[0]); err == nil {
headers[HEADER_DATE_CAMEL] = []string{FormatUtcToRfc1123(t)}
flag = true
}
} else {
if strings.HasSuffix(date[0], "GMT") {
headers[HEADER_DATE_CAMEL] = []string{date[0]}
flag = true
}
}
}
if !flag {
delete(headers, HEADER_DATE_AMZ)
}
}
if _, ok := headers[HEADER_DATE_CAMEL]; !ok {
headers[HEADER_DATE_CAMEL] = []string{FormatUtcToRfc1123(time.Now().UTC())}
}
}
func encodeHeaders(headers map[string][]string) {
for key, values := range headers {
for index, value := range values {
values[index] = UrlEncode(value, true)
}
headers[key] = values
}
}
func prepareDateHeader(dataHeader, dateCamelHeader string, headers, _headers map[string][]string) {
if _, ok := _headers[HEADER_DATE_CAMEL]; ok {
if _, ok := _headers[dataHeader]; ok {
_headers[HEADER_DATE_CAMEL] = []string{""}
} else if _, ok := headers[dateCamelHeader]; ok {
_headers[HEADER_DATE_CAMEL] = []string{""}
}
} else if _, ok := _headers[strings.ToLower(HEADER_DATE_CAMEL)]; ok {
if _, ok := _headers[dataHeader]; ok {
_headers[HEADER_DATE_CAMEL] = []string{""}
} else if _, ok := headers[dateCamelHeader]; ok {
_headers[HEADER_DATE_CAMEL] = []string{""}
}
}
}
func getStringToSign(keys []string, isObs bool, _headers map[string][]string) []string {
stringToSign := make([]string, 0, len(keys))
for _, key := range keys {
var value string
prefixHeader := HEADER_PREFIX
prefixMetaHeader := HEADER_PREFIX_META
if isObs {
prefixHeader = HEADER_PREFIX_OBS
prefixMetaHeader = HEADER_PREFIX_META_OBS
}
if strings.HasPrefix(key, prefixHeader) {
if strings.HasPrefix(key, prefixMetaHeader) {
for index, v := range _headers[key] {
value += strings.TrimSpace(v)
if index != len(_headers[key])-1 {
value += ","
}
}
} else {
value = strings.Join(_headers[key], ",")
}
value = fmt.Sprintf("%s:%s", key, value)
} else {
value = strings.Join(_headers[key], ",")
}
stringToSign = append(stringToSign, value)
}
return stringToSign
}
func attachHeaders(headers map[string][]string, isObs bool) string {
length := len(headers)
_headers := make(map[string][]string, length)
keys := make([]string, 0, length)
for key, value := range headers {
_key := strings.ToLower(strings.TrimSpace(key))
if _key != "" {
prefixheader := HEADER_PREFIX
if isObs {
prefixheader = HEADER_PREFIX_OBS
}
if _key == "content-md5" || _key == "content-type" || _key == "date" || strings.HasPrefix(_key, prefixheader) {
keys = append(keys, _key)
_headers[_key] = value
}
} else {
delete(headers, key)
}
}
for _, interestedHeader := range interestedHeaders {
if _, ok := _headers[interestedHeader]; !ok {
_headers[interestedHeader] = []string{""}
keys = append(keys, interestedHeader)
}
}
dateCamelHeader := PARAM_DATE_AMZ_CAMEL
dataHeader := HEADER_DATE_AMZ
if isObs {
dateCamelHeader = PARAM_DATE_OBS_CAMEL
dataHeader = HEADER_DATE_OBS
}
prepareDateHeader(dataHeader, dateCamelHeader, headers, _headers)
sort.Strings(keys)
stringToSign := getStringToSign(keys, isObs, _headers)
return strings.Join(stringToSign, "\n")
}
func getScope(region, shortDate string) string {
return fmt.Sprintf("%s/%s/%s/%s", shortDate, region, V4_SERVICE_NAME, V4_SERVICE_SUFFIX)
}
func getCredential(ak, region, shortDate string) (string, string) {
scope := getScope(region, shortDate)
return fmt.Sprintf("%s/%s", ak, scope), scope
}
func getSignedHeaders(headers map[string][]string) ([]string, map[string][]string) {
length := len(headers)
_headers := make(map[string][]string, length)
signedHeaders := make([]string, 0, length)
for key, value := range headers {
_key := strings.ToLower(strings.TrimSpace(key))
if _key != "" {
signedHeaders = append(signedHeaders, _key)
_headers[_key] = value
} else {
delete(headers, key)
}
}
sort.Strings(signedHeaders)
return signedHeaders, _headers
}
func getSignature(stringToSign, sk, region, shortDate string) string {
key := HmacSha256([]byte(V4_HASH_PRE+sk), []byte(shortDate))
key = HmacSha256(key, []byte(region))
key = HmacSha256(key, []byte(V4_SERVICE_NAME))
key = HmacSha256(key, []byte(V4_SERVICE_SUFFIX))
return Hex(HmacSha256(key, []byte(stringToSign)))
}