dex/connector/bitbucketcloud/bitbucketcloud.go
2019-12-18 15:56:12 +01:00

427 lines
11 KiB
Go

// Package bitbucketcloud provides authentication strategies using Bitbucket Cloud.
package bitbucketcloud
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"sync"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/bitbucket"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/pkg/groups"
"github.com/dexidp/dex/pkg/log"
)
const (
apiURL = "https://api.bitbucket.org/2.0"
// Bitbucket requires this scope to access '/user' API endpoints.
scopeAccount = "account"
// Bitbucket requires this scope to access '/user/emails' API endpoints.
scopeEmail = "email"
// Bitbucket requires this scope to access '/teams' API endpoints
// which are used when a client includes the 'groups' scope.
scopeTeams = "team"
)
// Config holds configuration options for Bitbucket logins.
type Config struct {
ClientID string `json:"clientID"`
ClientSecret string `json:"clientSecret"`
RedirectURI string `json:"redirectURI"`
Teams []string `json:"teams"`
}
// Open returns a strategy for logging in through Bitbucket.
func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
b := bitbucketConnector{
redirectURI: c.RedirectURI,
teams: c.Teams,
clientID: c.ClientID,
clientSecret: c.ClientSecret,
apiURL: apiURL,
logger: logger,
}
return &b, nil
}
type connectorData struct {
AccessToken string `json:"accessToken"`
RefreshToken string `json:"refreshToken"`
Expiry time.Time `json:"expiry"`
}
var (
_ connector.CallbackConnector = (*bitbucketConnector)(nil)
_ connector.RefreshConnector = (*bitbucketConnector)(nil)
)
type bitbucketConnector struct {
redirectURI string
teams []string
clientID string
clientSecret string
logger log.Logger
apiURL string
// the following are used only for tests
hostName string
httpClient *http.Client
}
// groupsRequired returns whether dex requires Bitbucket's 'team' scope.
func (b *bitbucketConnector) groupsRequired(groupScope bool) bool {
return len(b.teams) > 0 || groupScope
}
func (b *bitbucketConnector) oauth2Config(scopes connector.Scopes) *oauth2.Config {
bitbucketScopes := []string{scopeAccount, scopeEmail}
if b.groupsRequired(scopes.Groups) {
bitbucketScopes = append(bitbucketScopes, scopeTeams)
}
endpoint := bitbucket.Endpoint
if b.hostName != "" {
endpoint = oauth2.Endpoint{
AuthURL: "https://" + b.hostName + "/site/oauth2/authorize",
TokenURL: "https://" + b.hostName + "/site/oauth2/access_token",
}
}
return &oauth2.Config{
ClientID: b.clientID,
ClientSecret: b.clientSecret,
Endpoint: endpoint,
Scopes: bitbucketScopes,
}
}
func (b *bitbucketConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) {
if b.redirectURI != callbackURL {
return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, b.redirectURI)
}
return b.oauth2Config(scopes).AuthCodeURL(state), nil
}
type oauth2Error struct {
error string
errorDescription string
}
func (e *oauth2Error) Error() string {
if e.errorDescription == "" {
return e.error
}
return e.error + ": " + e.errorDescription
}
func (b *bitbucketConnector) HandleCallback(s connector.Scopes, r *http.Request) (identity connector.Identity, err error) {
q := r.URL.Query()
if errType := q.Get("error"); errType != "" {
return identity, &oauth2Error{errType, q.Get("error_description")}
}
oauth2Config := b.oauth2Config(s)
ctx := r.Context()
if b.httpClient != nil {
ctx = context.WithValue(r.Context(), oauth2.HTTPClient, b.httpClient)
}
token, err := oauth2Config.Exchange(ctx, q.Get("code"))
if err != nil {
return identity, fmt.Errorf("bitbucket: failed to get token: %v", err)
}
client := oauth2Config.Client(ctx, token)
user, err := b.user(ctx, client)
if err != nil {
return identity, fmt.Errorf("bitbucket: get user: %v", err)
}
identity = connector.Identity{
UserID: user.UUID,
Username: user.Username,
Email: user.Email,
EmailVerified: true,
}
if b.groupsRequired(s.Groups) {
groups, err := b.getGroups(ctx, client, s.Groups, user.Username)
if err != nil {
return identity, err
}
identity.Groups = groups
}
if s.OfflineAccess {
data := connectorData{
AccessToken: token.AccessToken,
RefreshToken: token.RefreshToken,
Expiry: token.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return identity, fmt.Errorf("bitbucket: marshal connector data: %v", err)
}
identity.ConnectorData = connData
}
return identity, nil
}
// Refreshing tokens
// https://github.com/golang/oauth2/issues/84#issuecomment-332860871
type tokenNotifyFunc func(*oauth2.Token) error
// notifyRefreshTokenSource is essentially `oauth2.ReuseTokenSource` with `TokenNotifyFunc` added.
type notifyRefreshTokenSource struct {
new oauth2.TokenSource
mu sync.Mutex // guards t
t *oauth2.Token
f tokenNotifyFunc // called when token refreshed so new refresh token can be persisted
}
// Token returns the current token if it's still valid, else will
// refresh the current token (using r.Context for HTTP client
// information) and return the new one.
func (s *notifyRefreshTokenSource) Token() (*oauth2.Token, error) {
s.mu.Lock()
defer s.mu.Unlock()
if s.t.Valid() {
return s.t, nil
}
t, err := s.new.Token()
if err != nil {
return nil, err
}
s.t = t
return t, s.f(t)
}
func (b *bitbucketConnector) Refresh(ctx context.Context, s connector.Scopes, identity connector.Identity) (connector.Identity, error) {
if len(identity.ConnectorData) == 0 {
return identity, errors.New("bitbucket: no upstream access token found")
}
var data connectorData
if err := json.Unmarshal(identity.ConnectorData, &data); err != nil {
return identity, fmt.Errorf("bitbucket: unmarshal access token: %v", err)
}
tok := &oauth2.Token{
AccessToken: data.AccessToken,
RefreshToken: data.RefreshToken,
Expiry: data.Expiry,
}
client := oauth2.NewClient(ctx, &notifyRefreshTokenSource{
new: b.oauth2Config(s).TokenSource(ctx, tok),
t: tok,
f: func(tok *oauth2.Token) error {
data := connectorData{
AccessToken: tok.AccessToken,
RefreshToken: tok.RefreshToken,
Expiry: tok.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return fmt.Errorf("bitbucket: marshal connector data: %v", err)
}
identity.ConnectorData = connData
return nil
},
})
user, err := b.user(ctx, client)
if err != nil {
return identity, fmt.Errorf("bitbucket: get user: %v", err)
}
identity.Username = user.Username
identity.Email = user.Email
if b.groupsRequired(s.Groups) {
groups, err := b.getGroups(ctx, client, s.Groups, user.Username)
if err != nil {
return identity, err
}
identity.Groups = groups
}
return identity, nil
}
// Bitbucket pagination wrapper
type pagedResponse struct {
Size int `json:"size"`
Page int `json:"page"`
PageLen int `json:"pagelen"`
Next *string `json:"next"`
Previous *string `json:"previous"`
}
// user holds Bitbucket user information (relevant to dex) as defined by
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user
type user struct {
Username string `json:"username"`
UUID string `json:"uuid"`
Email string `json:"email"`
}
// user queries the Bitbucket API for profile information using the provided client.
//
// The HTTP client is expected to be constructed by the golang.org/x/oauth2 package,
// which inserts a bearer token as part of the request.
func (b *bitbucketConnector) user(ctx context.Context, client *http.Client) (user, error) {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user
var (
u user
err error
)
if err = get(ctx, client, b.apiURL+"/user", &u); err != nil {
return user{}, err
}
if u.Email, err = b.userEmail(ctx, client); err != nil {
return user{}, err
}
return u, nil
}
// userEmail holds Bitbucket user email information as defined by
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user/emails
type userEmail struct {
IsPrimary bool `json:"is_primary"`
IsConfirmed bool `json:"is_confirmed"`
Email string `json:"email"`
}
type userEmailResponse struct {
pagedResponse
Values []userEmail
}
// userEmail returns the users primary, confirmed email
//
// The HTTP client is expected to be constructed by the golang.org/x/oauth2 package,
// which inserts a bearer token as part of the request.
func (b *bitbucketConnector) userEmail(ctx context.Context, client *http.Client) (string, error) {
apiURL := b.apiURL + "/user/emails"
for {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user/emails
var response userEmailResponse
if err := get(ctx, client, apiURL, &response); err != nil {
return "", err
}
for _, email := range response.Values {
if email.IsConfirmed && email.IsPrimary {
return email.Email, nil
}
}
if response.Next == nil {
break
}
}
return "", errors.New("bitbucket: user has no confirmed, primary email")
}
// getGroups retrieves Bitbucket teams a user is in, if any.
func (b *bitbucketConnector) getGroups(ctx context.Context, client *http.Client, groupScope bool, userLogin string) ([]string, error) {
bitbucketTeams, err := b.userTeams(ctx, client)
if err != nil {
return nil, err
}
if len(b.teams) > 0 {
filteredTeams := groups.Filter(bitbucketTeams, b.teams)
if len(filteredTeams) == 0 {
return nil, fmt.Errorf("bitbucket: user %q is not in any of the required teams", userLogin)
}
return filteredTeams, nil
} else if groupScope {
return bitbucketTeams, nil
}
return nil, nil
}
type team struct {
Name string `json:"username"` // The "username" from Bitbucket Cloud is actually the team name here
}
type userTeamsResponse struct {
pagedResponse
Values []team
}
func (b *bitbucketConnector) userTeams(ctx context.Context, client *http.Client) ([]string, error) {
var teams []string
apiURL := b.apiURL + "/teams?role=member"
for {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/teams
var response userTeamsResponse
if err := get(ctx, client, apiURL, &response); err != nil {
return nil, fmt.Errorf("bitbucket: get user teams: %v", err)
}
for _, team := range response.Values {
teams = append(teams, team.Name)
}
if response.Next == nil {
break
}
}
return teams, nil
}
// get creates a "GET `apiURL`" request with context, sends the request using
// the client, and decodes the resulting response body into v.
// Any errors encountered when building requests, sending requests, and
// reading and decoding response data are returned.
func get(ctx context.Context, client *http.Client, apiURL string, v interface{}) error {
req, err := http.NewRequest("GET", apiURL, nil)
if err != nil {
return fmt.Errorf("bitbucket: new req: %v", err)
}
req = req.WithContext(ctx)
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("bitbucket: get URL %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("bitbucket: read body: %s: %v", resp.Status, err)
}
return fmt.Errorf("%s: %s", resp.Status, body)
}
if err := json.NewDecoder(resp.Body).Decode(v); err != nil {
return fmt.Errorf("bitbucket: failed to decode response: %v", err)
}
return nil
}