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auth.go
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auth.go
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package crproxy
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"hash"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/docker/distribution/registry/api/errcode"
)
func (c *CRProxy) AuthToken(rw http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet {
errcode.ServeJSON(rw, errcode.ErrorCodeUnsupported)
return
}
if !c.simpleAuth {
errcode.ServeJSON(rw, errcode.ErrorCodeUnsupported)
return
}
query := r.URL.Query()
scope := query.Get("scope")
service := query.Get("service")
if c.simpleAuthUserpassFunc != nil {
authorization := r.Header.Get("Authorization")
auth := strings.SplitN(authorization, " ", 2)
if len(auth) != 2 {
if c.logger != nil {
c.logger.Println("Login failed", authorization)
}
errcode.ServeJSON(rw, errcode.ErrorCodeDenied)
return
}
switch auth[0] {
case "Basic":
user, pass, ok := parseBasicAuth(auth[1])
if user == "" || pass == "" {
errcode.ServeJSON(rw, errcode.ErrorCodeDenied)
return
}
var u *url.Userinfo
if ok {
u = url.UserPassword(user, pass)
} else {
u = url.User(user)
}
if !c.simpleAuthUserpassFunc(r, u) {
if c.logger != nil {
c.logger.Println("Login failed user and password", u)
}
errcode.ServeJSON(rw, errcode.ErrorCodeDenied)
return
}
if c.logger != nil {
c.logger.Println("Login succeed user", u.Username())
}
default:
if c.logger != nil {
c.logger.Println("Unsupported authorization", authorization)
}
errcode.ServeJSON(rw, errcode.ErrorCodeDenied)
return
}
}
rw.Header().Set("Content-Type", "application/json")
now := time.Now()
expiresIn := 60
token := defaultTokenManager.Encode(Token{
Service: service,
Scope: scope,
ExpiresAt: now.Add(time.Duration(expiresIn) * time.Second),
})
json.NewEncoder(rw).Encode(tokenInfo{
Token: token,
ExpiresIn: int64(expiresIn),
IssuedAt: now,
})
}
func (c *CRProxy) authenticate(rw http.ResponseWriter, r *http.Request) {
tokenURL := c.tokenURL
if tokenURL == "" {
var scheme = "http"
if c.tokenAuthForceTLS || r.TLS != nil || r.URL.Scheme == "https" {
scheme = "https"
}
tokenURL = scheme + "://" + r.Host + "/auth/token"
}
header := fmt.Sprintf("Bearer realm=%q,service=%q", tokenURL, r.Host)
rw.Header().Set("WWW-Authenticate", header)
c.errorResponse(rw, r, errcode.ErrorCodeUnauthorized)
}
func (c *CRProxy) authorization(rw http.ResponseWriter, r *http.Request) bool {
if c.privilegedNoAuth && c.isPrivileged(r, nil) {
r.Header.Del("Authorization")
return true
}
auth := r.Header.Get("Authorization")
if auth == "" {
return false
}
if !strings.HasPrefix(auth, "Bearer ") {
return false
}
token, ok := defaultTokenManager.Decode(auth[7:])
if !ok {
return false
}
if token.ExpiresAt.Before(time.Now()) {
return false
}
r.Header.Del("Authorization")
return true
}
type tokenInfo struct {
Token string `json:"token,omitempty"`
ExpiresIn int64 `json:"expires_in,omitempty"`
IssuedAt time.Time `json:"issued_at,omitempty"`
}
var defaultTokenManager = &tokenManager{
NewHash: sha256.New,
RandReader: rand.Reader,
HashSize: sha256.Size,
RandSize: 16,
EncodeToString: base64.RawURLEncoding.EncodeToString,
DecodeString: base64.RawURLEncoding.DecodeString,
}
type tokenManager struct {
NewHash func() hash.Hash
RandReader io.Reader
HashSize int
RandSize int
EncodeToString func([]byte) string
DecodeString func(string) ([]byte, error)
}
type Token struct {
ExpiresAt time.Time `json:"expires_at,omitempty"`
Scope string `json:"scope,omitempty"`
Service string `json:"service,omitempty"`
}
func (p *tokenManager) Encode(t Token) (code string) {
sum := make([]byte, p.RandSize+p.HashSize)
io.ReadFull(p.RandReader, sum[:p.RandSize])
hashSum := p.NewHash()
data, _ := json.Marshal(t)
hashSum.Write(data)
hashSum.Write(sum[:p.RandSize])
sum = hashSum.Sum(sum[:p.RandSize])
return p.EncodeToString(sum) + "." + p.EncodeToString(data)
}
func (p *tokenManager) Decode(code string) (t Token, b bool) {
cs := strings.Split(code, ".")
if len(cs) != 2 {
return t, false
}
sum, err := p.DecodeString(cs[0])
if err != nil {
return t, false
}
if len(sum) != p.HashSize+p.RandSize {
return t, false
}
data, err := p.DecodeString(cs[1])
if err != nil {
return t, false
}
hashSum := p.NewHash()
hashSum.Write(data)
hashSum.Write(sum[:p.RandSize])
newSum := hashSum.Sum(nil)
if !bytes.Equal(sum[p.RandSize:], newSum) {
return t, false
}
err = json.Unmarshal(data, &t)
if err != nil {
return t, false
}
return t, true
}
func parseBasicAuth(auth string) (username, password string, ok bool) {
c, err := base64.StdEncoding.DecodeString(auth)
if err != nil {
return "", "", false
}
cs := string(c)
username, password, ok = strings.Cut(cs, ":")
if !ok {
return "", "", false
}
return username, password, true
}