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// Adapted from
// https://git.leonardobishop.net/confplanner/plain/pkg/auth/oauth.go
package auth
import (
"context"
"crypto/rand"
"encoding/base64"
"errors"
"sync"
"time"
"git.leonardobishop.net/instancer/pkg/session"
"github.com/coreos/go-oidc/v3/oidc"
"golang.org/x/oauth2"
)
type OIDCAuthProvider struct {
Name string
oauthConfig *oauth2.Config
oidcProvider *oidc.Provider
oidcVerifier *oidc.IDTokenVerifier
states map[string]*oidcState
lock sync.RWMutex
}
type oidcState struct {
expiry time.Time
ip string
userAgent string
}
var (
ErrStateVerificationFailed = errors.New("state verification failed")
ErrInvalidState = errors.New("invalid state")
ErrMissingIDToken = errors.New("missing ID token")
ErrInvalidIDToken = errors.New("invalid ID token")
ErrNotAuthorised = errors.New("not authorised")
ErrUserSyncFailed = errors.New("user sync failed")
ErrInvalidToken = errors.New("invalid token")
)
func NewOIDCAuthProvider(name, clientID, clientSecret, endpoint, callbackURL string) (OIDCAuthProvider, error) {
provider, err := oidc.NewProvider(context.Background(), endpoint)
if err != nil {
return OIDCAuthProvider{}, err
}
return OIDCAuthProvider{
Name: name,
oauthConfig: &oauth2.Config{
ClientID: clientID,
ClientSecret: clientSecret,
Endpoint: provider.Endpoint(),
RedirectURL: callbackURL,
Scopes: []string{oidc.ScopeOpenID, "profile", "email"},
},
oidcProvider: provider,
oidcVerifier: provider.Verifier(&oidc.Config{ClientID: clientID}),
states: make(map[string]*oidcState),
}, nil
}
func (p *OIDCAuthProvider) StartJourney(ip string, userAgent string) (string, error) {
b := make([]byte, 50)
if _, err := rand.Read(b); err != nil {
return "", err
}
state := base64.URLEncoding.EncodeToString(b)
p.lock.Lock()
defer p.lock.Unlock()
p.states[state] = &oidcState{
expiry: time.Now().Add(time.Minute * 5),
ip: ip,
userAgent: userAgent,
}
return p.oauthConfig.AuthCodeURL(state), nil
}
func (p *OIDCAuthProvider) CompleteJourney(ctx context.Context, authCode string, state string, ip string, userAgent string, session *session.UserSession) error {
var s *oidcState
p.lock.Lock()
s = p.states[state]
delete(p.states, state)
p.lock.Unlock()
if s == nil {
return ErrInvalidState
}
//if time.Now().After(s.expiry) || s.ip != ip || s.userAgent != userAgent {
// return nil, ErrStateVerificationFailed
//}
if time.Now().After(s.expiry) || s.userAgent != userAgent {
return ErrStateVerificationFailed
}
oauth2Token, err := p.oauthConfig.Exchange(ctx, authCode)
if err != nil {
return err
}
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if !ok {
return ErrMissingIDToken
}
idToken, err := p.oidcVerifier.Verify(ctx, rawIDToken)
if err != nil {
return ErrInvalidIDToken
}
var claims struct {
Subject string `json:"sub"`
Email string `json:"email"`
Name string `json:"name"`
}
if err := idToken.Claims(&claims); err != nil {
return ErrInvalidIDToken
}
session.OAuthTokenSource = p.oauthConfig.TokenSource(context.Background(), oauth2Token)
session.Subject = claims.Subject
session.Email = claims.Email
session.Name = claims.Name
return nil
}
func (p *OIDCAuthProvider) UpdateUserInfo(ctx context.Context, session *session.UserSession) error {
session.UserInfoMutex.Lock()
defer session.UserInfoMutex.Unlock()
if session.TeamID != "" && session.TeamName != "" && session.UserInfoExpires.Unix() > time.Now().Unix() {
return nil
}
userInfo, err := p.oidcProvider.UserInfo(ctx, session.OAuthTokenSource)
if err != nil {
return err
}
var claims struct {
Name string `json:"name"`
TeamID string `json:"team_id"`
TeamName string `json:"team_name"`
}
err = userInfo.Claims(&claims)
if err != nil {
return err
}
session.Subject = userInfo.Subject
session.Email = userInfo.Email
session.Name = claims.Name
session.TeamID = claims.TeamID
session.TeamName = claims.TeamName
session.UserInfoExpires = time.Now().Add(1 * time.Minute)
return nil
}
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