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keystone.go
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keystone.go
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// Package keystone provides authentication strategy using Keystone.
package keystone
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/concourse/dex/connector"
"github.com/concourse/dex/pkg/log"
)
type conn struct {
Domain string
Host string
AdminUsername string
AdminPassword string
Logger log.Logger
}
type userKeystone struct {
Domain domainKeystone `json:"domain"`
ID string `json:"id"`
Name string `json:"name"`
}
type domainKeystone struct {
ID string `json:"id"`
Name string `json:"name"`
}
// Config holds the configuration parameters for Keystone connector.
// Keystone should expose API v3
// An example config:
// connectors:
// type: keystone
// id: keystone
// name: Keystone
// config:
// keystoneHost: http://example:5000
// domain: default
// keystoneUsername: demo
// keystonePassword: DEMO_PASS
type Config struct {
Domain string `json:"domain"`
Host string `json:"keystoneHost"`
AdminUsername string `json:"keystoneUsername"`
AdminPassword string `json:"keystonePassword"`
}
type loginRequestData struct {
auth `json:"auth"`
}
type auth struct {
Identity identity `json:"identity"`
}
type identity struct {
Methods []string `json:"methods"`
Password password `json:"password"`
}
type password struct {
User user `json:"user"`
}
type user struct {
Name string `json:"name"`
Domain domain `json:"domain"`
Password string `json:"password"`
}
type domain struct {
ID string `json:"id"`
}
type token struct {
User userKeystone `json:"user"`
}
type tokenResponse struct {
Token token `json:"token"`
}
type group struct {
ID string `json:"id"`
Name string `json:"name"`
}
type groupsResponse struct {
Groups []group `json:"groups"`
}
type userResponse struct {
User struct {
Name string `json:"name"`
Email string `json:"email"`
ID string `json:"id"`
} `json:"user"`
}
var (
_ connector.PasswordConnector = &conn{}
_ connector.RefreshConnector = &conn{}
)
// Open returns an authentication strategy using Keystone.
func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
return &conn{
c.Domain,
c.Host,
c.AdminUsername,
c.AdminPassword,
logger,
}, nil
}
func (p *conn) Close() error { return nil }
func (p *conn) Login(ctx context.Context, scopes connector.Scopes, username, password string) (identity connector.Identity, validPassword bool, err error) {
resp, err := p.getTokenResponse(ctx, username, password)
if err != nil {
return identity, false, fmt.Errorf("keystone: error %v", err)
}
if resp.StatusCode/100 != 2 {
return identity, false, fmt.Errorf("keystone login: error %v", resp.StatusCode)
}
if resp.StatusCode != 201 {
return identity, false, nil
}
token := resp.Header.Get("X-Subject-Token")
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return identity, false, err
}
defer resp.Body.Close()
tokenResp := new(tokenResponse)
err = json.Unmarshal(data, &tokenResp)
if err != nil {
return identity, false, fmt.Errorf("keystone: invalid token response: %v", err)
}
if scopes.Groups {
groups, err := p.getUserGroups(ctx, tokenResp.Token.User.ID, token)
if err != nil {
return identity, false, err
}
identity.Groups = groups
}
identity.Username = username
identity.UserID = tokenResp.Token.User.ID
user, err := p.getUser(ctx, tokenResp.Token.User.ID, token)
if err != nil {
return identity, false, err
}
if user.User.Email != "" {
identity.Email = user.User.Email
identity.EmailVerified = true
}
return identity, true, nil
}
func (p *conn) Prompt() string { return "username" }
func (p *conn) Refresh(
ctx context.Context, scopes connector.Scopes, identity connector.Identity) (connector.Identity, error) {
token, err := p.getAdminToken(ctx)
if err != nil {
return identity, fmt.Errorf("keystone: failed to obtain admin token: %v", err)
}
ok, err := p.checkIfUserExists(ctx, identity.UserID, token)
if err != nil {
return identity, err
}
if !ok {
return identity, fmt.Errorf("keystone: user %q does not exist", identity.UserID)
}
if scopes.Groups {
groups, err := p.getUserGroups(ctx, identity.UserID, token)
if err != nil {
return identity, err
}
identity.Groups = groups
}
return identity, nil
}
func (p *conn) getTokenResponse(ctx context.Context, username, pass string) (response *http.Response, err error) {
client := &http.Client{}
jsonData := loginRequestData{
auth: auth{
Identity: identity{
Methods: []string{"password"},
Password: password{
User: user{
Name: username,
Domain: domain{ID: p.Domain},
Password: pass,
},
},
},
},
}
jsonValue, err := json.Marshal(jsonData)
if err != nil {
return nil, err
}
// https://developer.openstack.org/api-ref/identity/v3/#password-authentication-with-unscoped-authorization
authTokenURL := p.Host + "/v3/auth/tokens/"
req, err := http.NewRequest("POST", authTokenURL, bytes.NewBuffer(jsonValue))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req = req.WithContext(ctx)
return client.Do(req)
}
func (p *conn) getAdminToken(ctx context.Context) (string, error) {
resp, err := p.getTokenResponse(ctx, p.AdminUsername, p.AdminPassword)
if err != nil {
return "", err
}
defer resp.Body.Close()
token := resp.Header.Get("X-Subject-Token")
return token, nil
}
func (p *conn) checkIfUserExists(ctx context.Context, userID string, token string) (bool, error) {
user, err := p.getUser(ctx, userID, token)
return user != nil, err
}
func (p *conn) getUser(ctx context.Context, userID string, token string) (*userResponse, error) {
// https://developer.openstack.org/api-ref/identity/v3/#show-user-details
userURL := p.Host + "/v3/users/" + userID
client := &http.Client{}
req, err := http.NewRequest("GET", userURL, nil)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Token", token)
req = req.WithContext(ctx)
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, err
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
user := userResponse{}
err = json.Unmarshal(data, &user)
if err != nil {
return nil, err
}
return &user, nil
}
func (p *conn) getUserGroups(ctx context.Context, userID string, token string) ([]string, error) {
client := &http.Client{}
// https://developer.openstack.org/api-ref/identity/v3/#list-groups-to-which-a-user-belongs
groupsURL := p.Host + "/v3/users/" + userID + "/groups"
req, err := http.NewRequest("GET", groupsURL, nil)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Token", token)
req = req.WithContext(ctx)
resp, err := client.Do(req)
if err != nil {
p.Logger.Errorf("keystone: error while fetching user %q groups\n", userID)
return nil, err
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
defer resp.Body.Close()
groupsResp := new(groupsResponse)
err = json.Unmarshal(data, &groupsResp)
if err != nil {
return nil, err
}
groups := make([]string, len(groupsResp.Groups))
for i, group := range groupsResp.Groups {
groups[i] = group.Name
}
return groups, nil
}