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azure_acr_helper.go 9.02 KB
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/*
Copyright 2016 The Kubernetes Authors.
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.
*/
/*
Copyright 2017 Microsoft Corporation
MIT License
Copyright (c) Microsoft Corporation. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE
*/
// Source: https://github.com/Azure/acr-docker-credential-helper/blob/a79b541f3ee761f6cc4511863ed41fb038c19464/src/docker-credential-acr/acr_login.go
package azure
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
"unicode"
jwt "github.com/dgrijalva/jwt-go"
)
type authDirective struct {
service string
realm string
}
type accessTokenPayload struct {
TenantID string `json:"tid"`
}
type acrTokenPayload struct {
Expiration int64 `json:"exp"`
TenantID string `json:"tenant"`
Credential string `json:"credential"`
}
type acrAuthResponse struct {
RefreshToken string `json:"refresh_token"`
}
// 5 minutes buffer time to allow timeshift between local machine and AAD
const timeShiftBuffer = 300
const userAgentHeader = "User-Agent"
const userAgent = "kubernetes-credentialprovider-acr"
const dockerTokenLoginUsernameGUID = "00000000-0000-0000-0000-000000000000"
var client = &http.Client{}
func receiveChallengeFromLoginServer(serverAddress string) (*authDirective, error) {
challengeURL := url.URL{
Scheme: "https",
Host: serverAddress,
Path: "v2/",
}
var err error
var r *http.Request
r, _ = http.NewRequest("GET", challengeURL.String(), nil)
r.Header.Add(userAgentHeader, userAgent)
var challenge *http.Response
if challenge, err = client.Do(r); err != nil {
return nil, fmt.Errorf("Error reaching registry endpoint %s, error: %s", challengeURL.String(), err)
}
defer challenge.Body.Close()
if challenge.StatusCode != 401 {
return nil, fmt.Errorf("Registry did not issue a valid AAD challenge, status: %d", challenge.StatusCode)
}
var authHeader []string
var ok bool
if authHeader, ok = challenge.Header["Www-Authenticate"]; !ok {
return nil, fmt.Errorf("Challenge response does not contain header 'Www-Authenticate'")
}
if len(authHeader) != 1 {
return nil, fmt.Errorf("Registry did not issue a valid AAD challenge, authenticate header [%s]",
strings.Join(authHeader, ", "))
}
authSections := strings.SplitN(authHeader[0], " ", 2)
authType := strings.ToLower(authSections[0])
var authParams *map[string]string
if authParams, err = parseAssignments(authSections[1]); err != nil {
return nil, fmt.Errorf("Unable to understand the contents of Www-Authenticate header %s", authSections[1])
}
// verify headers
if !strings.EqualFold("Bearer", authType) {
return nil, fmt.Errorf("Www-Authenticate: expected realm: Bearer, actual: %s", authType)
}
if len((*authParams)["service"]) == 0 {
return nil, fmt.Errorf("Www-Authenticate: missing header \"service\"")
}
if len((*authParams)["realm"]) == 0 {
return nil, fmt.Errorf("Www-Authenticate: missing header \"realm\"")
}
return &authDirective{
service: (*authParams)["service"],
realm: (*authParams)["realm"],
}, nil
}
func parseAcrToken(identityToken string) (token *acrTokenPayload, err error) {
tokenSegments := strings.Split(identityToken, ".")
if len(tokenSegments) < 2 {
return nil, fmt.Errorf("Invalid existing refresh token length: %d", len(tokenSegments))
}
payloadSegmentEncoded := tokenSegments[1]
var payloadBytes []byte
if payloadBytes, err = jwt.DecodeSegment(payloadSegmentEncoded); err != nil {
return nil, fmt.Errorf("Error decoding payload segment from refresh token, error: %s", err)
}
var payload acrTokenPayload
if err = json.Unmarshal(payloadBytes, &payload); err != nil {
return nil, fmt.Errorf("Error unmarshalling acr payload, error: %s", err)
}
return &payload, nil
}
func performTokenExchange(
serverAddress string,
directive *authDirective,
tenant string,
accessToken string) (string, error) {
var err error
data := url.Values{
"service": []string{directive.service},
"grant_type": []string{"access_token_refresh_token"},
"access_token": []string{accessToken},
"refresh_token": []string{accessToken},
"tenant": []string{tenant},
}
var realmURL *url.URL
if realmURL, err = url.Parse(directive.realm); err != nil {
return "", fmt.Errorf("Www-Authenticate: invalid realm %s", directive.realm)
}
authEndpoint := fmt.Sprintf("%s://%s/oauth2/exchange", realmURL.Scheme, realmURL.Host)
datac := data.Encode()
var r *http.Request
r, _ = http.NewRequest("POST", authEndpoint, bytes.NewBufferString(datac))
r.Header.Add(userAgentHeader, userAgent)
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
r.Header.Add("Content-Length", strconv.Itoa(len(datac)))
var exchange *http.Response
if exchange, err = client.Do(r); err != nil {
return "", fmt.Errorf("Www-Authenticate: failed to reach auth url %s", authEndpoint)
}
defer exchange.Body.Close()
if exchange.StatusCode != 200 {
return "", fmt.Errorf("Www-Authenticate: auth url %s responded with status code %d", authEndpoint, exchange.StatusCode)
}
var content []byte
if content, err = ioutil.ReadAll(exchange.Body); err != nil {
return "", fmt.Errorf("Www-Authenticate: error reading response from %s", authEndpoint)
}
var authResp acrAuthResponse
if err = json.Unmarshal(content, &authResp); err != nil {
return "", fmt.Errorf("Www-Authenticate: unable to read response %s", content)
}
return authResp.RefreshToken, nil
}
// Try and parse a string of assignments in the form of:
// key1 = value1, key2 = "value 2", key3 = ""
// Note: this method and handle quotes but does not handle escaping of quotes
func parseAssignments(statements string) (*map[string]string, error) {
var cursor int
result := make(map[string]string)
var errorMsg = fmt.Errorf("malformed header value: %s", statements)
for {
// parse key
equalIndex := nextOccurrence(statements, cursor, "=")
if equalIndex == -1 {
return nil, errorMsg
}
key := strings.TrimSpace(statements[cursor:equalIndex])
// parse value
cursor = nextNoneSpace(statements, equalIndex+1)
if cursor == -1 {
return nil, errorMsg
}
// case: value is quoted
if statements[cursor] == '"' {
cursor = cursor + 1
// like I said, not handling escapes, but this will skip any comma that's
// within the quotes which is somewhat more likely
closeQuoteIndex := nextOccurrence(statements, cursor, "\"")
if closeQuoteIndex == -1 {
return nil, errorMsg
}
value := statements[cursor:closeQuoteIndex]
result[key] = value
commaIndex := nextNoneSpace(statements, closeQuoteIndex+1)
if commaIndex == -1 {
// no more comma, done
return &result, nil
} else if statements[commaIndex] != ',' {
// expect comma immediately after close quote
return nil, errorMsg
} else {
cursor = commaIndex + 1
}
} else {
commaIndex := nextOccurrence(statements, cursor, ",")
endStatements := commaIndex == -1
var untrimmed string
if endStatements {
untrimmed = statements[cursor:commaIndex]
} else {
untrimmed = statements[cursor:]
}
value := strings.TrimSpace(untrimmed)
if len(value) == 0 {
// disallow empty value without quote
return nil, errorMsg
}
result[key] = value
if endStatements {
return &result, nil
}
cursor = commaIndex + 1
}
}
}
func nextOccurrence(str string, start int, sep string) int {
if start >= len(str) {
return -1
}
offset := strings.Index(str[start:], sep)
if offset == -1 {
return -1
}
return offset + start
}
func nextNoneSpace(str string, start int) int {
if start >= len(str) {
return -1
}
offset := strings.IndexFunc(str[start:], func(c rune) bool { return !unicode.IsSpace(c) })
if offset == -1 {
return -1
}
return offset + start
}

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