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Refactor client auth

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Move client auth into a separate package.
Separate ping from the authorizer and export Challenges type.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2015-05-21 11:14:46 -07:00
parent c56e28826e
commit 5a7dab4670
4 changed files with 109 additions and 104 deletions
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52
registry/client/transport/authchallenge.go → registry/client/auth/authchallenge.go
View file

@ -1,6 +1,7 @@
package transport
package auth
import (
"fmt"
"net/http"
"strings"
)
@ -8,10 +9,13 @@ import (
// Octet types from RFC 2616.
type octetType byte
// authorizationChallenge carries information
// from a WWW-Authenticate response header.
type authorizationChallenge struct {
Scheme string
// Challenge carries information from a WWW-Authenticate response header.
// See RFC 2617.
type Challenge struct {
// Scheme is the auth-scheme according to RFC 2617
Scheme string
// Parameters are the auth-params according to RFC 2617
Parameters map[string]string
}
@ -54,12 +58,44 @@ func init() {
}
}
func parseAuthHeader(header http.Header) map[string]authorizationChallenge {
challenges := map[string]authorizationChallenge{}
// Ping pings the provided endpoint to determine its required authorization challenges.
// If a version header is provided, the versions will be returned.
func Ping(client *http.Client, endpoint, versionHeader string) ([]Challenge, []string, error) {
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
versions := []string{}
if versionHeader != "" {
for _, supportedVersions := range resp.Header[http.CanonicalHeaderKey(versionHeader)] {
versions = append(versions, strings.Fields(supportedVersions)...)
}
}
if resp.StatusCode == http.StatusUnauthorized {
// Parse the WWW-Authenticate Header and store the challenges
// on this endpoint object.
return parseAuthHeader(resp.Header), versions, nil
} else if resp.StatusCode != http.StatusOK {
return nil, versions, fmt.Errorf("unable to get valid ping response: %d", resp.StatusCode)
}
return nil, versions, nil
}
func parseAuthHeader(header http.Header) []Challenge {
challenges := []Challenge{}
for _, h := range header[http.CanonicalHeaderKey("WWW-Authenticate")] {
v, p := parseValueAndParams(h)
if v != "" {
challenges[v] = authorizationChallenge{Scheme: v, Parameters: p}
challenges = append(challenges, Challenge{Scheme: v, Parameters: p})
}
}
return challenges

4
registry/client/transport/authchallenge_test.go → registry/client/auth/authchallenge_test.go
View file

@ -1,4 +1,4 @@
package transport
package auth
import (
"net/http"
@ -13,7 +13,7 @@ func TestAuthChallengeParse(t *testing.T) {
if len(challenges) != 1 {
t.Fatalf("Unexpected number of auth challenges: %d, expected 1", len(challenges))
}
challenge := challenges["bearer"]
challenge := challenges[0]
if expected := "bearer"; challenge.Scheme != expected {
t.Fatalf("Unexpected scheme: %s, expected: %s", challenge.Scheme, expected)

102
registry/client/transport/session.go → registry/client/auth/session.go
View file

@ -1,4 +1,4 @@
package transport
package auth
import (
"encoding/json"
@ -9,6 +9,8 @@ import (
"strings"
"sync"
"time"
"github.com/docker/distribution/registry/client/transport"
)
// AuthenticationHandler is an interface for authorizing a request from
@ -32,71 +34,24 @@ type CredentialStore interface {
// NewAuthorizer creates an authorizer which can handle multiple authentication
// schemes. The handlers are tried in order, the higher priority authentication
// methods should be first.
func NewAuthorizer(transport http.RoundTripper, handlers ...AuthenticationHandler) RequestModifier {
return &tokenAuthorizer{
challenges: map[string]map[string]authorizationChallenge{},
// methods should be first. The challengeMap holds a list of challenges for
// a given root API endpoint (for example "https://registry-1.docker.io/v2/").
func NewAuthorizer(challengeMap map[string][]Challenge, handlers ...AuthenticationHandler) transport.RequestModifier {
return &endpointAuthorizer{
challenges: challengeMap,
handlers: handlers,
transport: transport,
}
}
type tokenAuthorizer struct {
challenges map[string]map[string]authorizationChallenge
type endpointAuthorizer struct {
challenges map[string][]Challenge
handlers []AuthenticationHandler
transport http.RoundTripper
}
func (ta *tokenAuthorizer) ping(endpoint string) (map[string]authorizationChallenge, error) {
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, err
}
client := &http.Client{
Transport: ta.transport,
// Ping should fail fast
Timeout: 5 * time.Second,
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// TODO(dmcgowan): Add version string which would allow skipping this section
var supportsV2 bool
HeaderLoop:
for _, supportedVersions := range resp.Header[http.CanonicalHeaderKey("Docker-Distribution-API-Version")] {
for _, versionName := range strings.Fields(supportedVersions) {
if versionName == "registry/2.0" {
supportsV2 = true
break HeaderLoop
}
}
}
if !supportsV2 {
return nil, fmt.Errorf("%s does not appear to be a v2 registry endpoint", endpoint)
}
if resp.StatusCode == http.StatusUnauthorized {
// Parse the WWW-Authenticate Header and store the challenges
// on this endpoint object.
return parseAuthHeader(resp.Header), nil
} else if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("unable to get valid ping response: %d", resp.StatusCode)
}
return nil, nil
}
func (ta *tokenAuthorizer) ModifyRequest(req *http.Request) error {
func (ea *endpointAuthorizer) ModifyRequest(req *http.Request) error {
v2Root := strings.Index(req.URL.Path, "/v2/")
// Test if /v2/ does not exist or not at beginning
// TODO(dmcgowan) support v2 endpoints which have a prefix before /v2/
if v2Root == -1 || v2Root > 0 {
if v2Root == -1 {
return nil
}
@ -108,19 +63,16 @@ func (ta *tokenAuthorizer) ModifyRequest(req *http.Request) error {
pingEndpoint := ping.String()
challenges, ok := ta.challenges[pingEndpoint]
challenges, ok := ea.challenges[pingEndpoint]
if !ok {
var err error
challenges, err = ta.ping(pingEndpoint)
if err != nil {
return err
}
ta.challenges[pingEndpoint] = challenges
return nil
}
for _, handler := range ta.handlers {
challenge, ok := challenges[handler.Scheme()]
if ok {
for _, handler := range ea.handlers {
for _, challenge := range challenges {
if challenge.Scheme != handler.Scheme() {
continue
}
if err := handler.AuthorizeRequest(req, challenge.Parameters); err != nil {
return err
}
@ -133,7 +85,7 @@ func (ta *tokenAuthorizer) ModifyRequest(req *http.Request) error {
type tokenHandler struct {
header http.Header
creds CredentialStore
scope TokenScope
scope tokenScope
transport http.RoundTripper
tokenLock sync.Mutex
@ -141,25 +93,29 @@ type tokenHandler struct {
tokenExpiration time.Time
}
// TokenScope represents the scope at which a token will be requested.
// tokenScope represents the scope at which a token will be requested.
// This represents a specific action on a registry resource.
type TokenScope struct {
type tokenScope struct {
Resource string
Scope string
Actions []string
}
func (ts TokenScope) String() string {
func (ts tokenScope) String() string {
return fmt.Sprintf("%s:%s:%s", ts.Resource, ts.Scope, strings.Join(ts.Actions, ","))
}
// NewTokenHandler creates a new AuthenicationHandler which supports
// fetching tokens from a remote token server.
func NewTokenHandler(transport http.RoundTripper, creds CredentialStore, scope TokenScope) AuthenticationHandler {
func NewTokenHandler(transport http.RoundTripper, creds CredentialStore, scope string, actions ...string) AuthenticationHandler {
return &tokenHandler{
transport: transport,
creds: creds,
scope: scope,
scope: tokenScope{
Resource: "repository",
Scope: scope,
Actions: actions,
},
}
}

55
registry/client/transport/session_test.go → registry/client/auth/session_test.go
View file

@ -1,4 +1,4 @@
package transport
package auth
import (
"encoding/base64"
@ -8,6 +8,7 @@ import (
"net/url"
"testing"
"github.com/docker/distribution/registry/client/transport"
"github.com/docker/distribution/testutil"
)
@ -67,17 +68,6 @@ func TestEndpointAuthorizeToken(t *testing.T) {
repo2 := "other/registry"
scope1 := fmt.Sprintf("repository:%s:pull,push", repo1)
scope2 := fmt.Sprintf("repository:%s:pull,push", repo2)
tokenScope1 := TokenScope{
Resource: "repository",
Scope: repo1,
Actions: []string{"pull", "push"},
}
tokenScope2 := TokenScope{
Resource: "repository",
Scope: repo2,
Actions: []string{"pull", "push"},
}
tokenMap := testutil.RequestResponseMap([]testutil.RequestResponseMapping{
{
Request: testutil.Request{
@ -122,7 +112,14 @@ func TestEndpointAuthorizeToken(t *testing.T) {
e, c := testServerWithAuth(m, authenicate, validCheck)
defer c()
transport1 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, nil, tokenScope1)))
challenges1, _, err := Ping(&http.Client{}, e+"/v2/", "")
if err != nil {
t.Fatal(err)
}
challengeMap1 := map[string][]Challenge{
e + "/v2/": challenges1,
}
transport1 := transport.NewTransport(nil, NewAuthorizer(challengeMap1, NewTokenHandler(nil, nil, repo1, "pull", "push")))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)
@ -141,7 +138,14 @@ func TestEndpointAuthorizeToken(t *testing.T) {
e2, c2 := testServerWithAuth(m, authenicate, badCheck)
defer c2()
transport2 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, nil, tokenScope2)))
challenges2, _, err := Ping(&http.Client{}, e+"/v2/", "")
if err != nil {
t.Fatal(err)
}
challengeMap2 := map[string][]Challenge{
e + "/v2/": challenges2,
}
transport2 := transport.NewTransport(nil, NewAuthorizer(challengeMap2, NewTokenHandler(nil, nil, repo2, "pull", "push")))
client2 := &http.Client{Transport: transport2}
req, _ = http.NewRequest("GET", e2+"/v2/hello", nil)
@ -166,11 +170,6 @@ func TestEndpointAuthorizeTokenBasic(t *testing.T) {
scope := fmt.Sprintf("repository:%s:pull,push", repo)
username := "tokenuser"
password := "superSecretPa$$word"
tokenScope := TokenScope{
Resource: "repository",
Scope: repo,
Actions: []string{"pull", "push"},
}
tokenMap := testutil.RequestResponseMap([]testutil.RequestResponseMapping{
{
@ -216,7 +215,14 @@ func TestEndpointAuthorizeTokenBasic(t *testing.T) {
password: password,
}
transport1 := NewTransport(nil, NewAuthorizer(nil, NewTokenHandler(nil, creds, tokenScope), NewBasicHandler(creds)))
challenges, _, err := Ping(&http.Client{}, e+"/v2/", "")
if err != nil {
t.Fatal(err)
}
challengeMap := map[string][]Challenge{
e + "/v2/": challenges,
}
transport1 := transport.NewTransport(nil, NewAuthorizer(challengeMap, NewTokenHandler(nil, creds, repo, "pull", "push"), NewBasicHandler(creds)))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)
@ -256,7 +262,14 @@ func TestEndpointAuthorizeBasic(t *testing.T) {
password: password,
}
transport1 := NewTransport(nil, NewAuthorizer(nil, NewBasicHandler(creds)))
challenges, _, err := Ping(&http.Client{}, e+"/v2/", "")
if err != nil {
t.Fatal(err)
}
challengeMap := map[string][]Challenge{
e + "/v2/": challenges,
}
transport1 := transport.NewTransport(nil, NewAuthorizer(challengeMap, NewBasicHandler(creds)))
client := &http.Client{Transport: transport1}
req, _ := http.NewRequest("GET", e+"/v2/hello", nil)