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package auth
import (
"context"
"crypto/rand"
"encoding/base64"
"errors"
"fmt"
"strings"
"sync"
"time"
"github.com/LMBishop/confplanner/pkg/database/sqlc"
"github.com/LMBishop/confplanner/pkg/user"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/tidwall/gjson"
"golang.org/x/oauth2"
)
type OIDCAuthProvider struct {
name string
userService user.Service
oauthConfig *oauth2.Config
oidcProvider *oidc.Provider
oidcVerifier *oidc.IDTokenVerifier
loginFilter string
loginFilterAllowedValues []string
userSyncFilter string
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")
ErrNotAuthorised = errors.New("not authorised")
ErrUserSyncFailed = errors.New("user sync failed")
)
func NewOIDCAuthProvider(userService user.Service, name, clientID, clientSecret, endpoint, callbackURL, loginFilter, userSyncFilter string, loginFilterAllowedValues []string) (AuthProvider, error) {
provider, err := oidc.NewProvider(context.Background(), endpoint)
if err != nil {
return nil, err
}
return &OIDCAuthProvider{
name: name,
userService: userService,
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}),
loginFilter: loginFilter,
loginFilterAllowedValues: loginFilterAllowedValues,
userSyncFilter: userSyncFilter,
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) (*sqlc.User, error) {
var s *oidcState
p.lock.Lock()
s = p.states[state]
delete(p.states, state)
p.lock.Unlock()
if s == nil {
return nil, 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 nil, ErrStateVerificationFailed
}
oauth2Token, err := p.oauthConfig.Exchange(ctx, authCode)
if err != nil {
return nil, err
}
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if !ok {
return nil, ErrMissingIDToken
}
_, err = p.oidcVerifier.Verify(ctx, rawIDToken)
if err != nil {
return nil, err
}
claims, err := getRawClaims(rawIDToken)
if err != nil {
return nil, err
}
if p.loginFilter != "" {
rolesClaim := gjson.Get(claims, p.loginFilter)
if !rolesClaim.Exists() {
return nil, fmt.Errorf("cannot verify authorisation as '%s' is missing from claims", p.loginFilter)
}
roles := rolesClaim.Array()
var authorisation bool
out:
for _, allowedRole := range p.loginFilterAllowedValues {
for _, role := range roles {
if role.Str == allowedRole {
authorisation = true
break out
}
}
}
if !authorisation {
return nil, ErrNotAuthorised
}
}
usernameClaim := gjson.Get(claims, p.userSyncFilter)
if !usernameClaim.Exists() {
return nil, fmt.Errorf("cannot sync user as '%s' is missing from claims", p.userSyncFilter)
}
username := usernameClaim.Str
u, err := p.userService.GetUserByName(username)
if err != nil {
if errors.Is(err, user.ErrUserNotFound) {
u, err = p.userService.CreateUser(username, "")
if err != nil {
return nil, errors.Join(ErrUserSyncFailed, err)
}
} else {
return nil, errors.Join(ErrUserSyncFailed, err)
}
}
return u, nil
}
func (p *OIDCAuthProvider) Name() string {
return p.name
}
func (p *OIDCAuthProvider) Type() string {
return "oidc"
}
func getRawClaims(p string) (string, error) {
parts := strings.Split(p, ".")
if len(parts) < 2 {
return "", fmt.Errorf("malformed jwt, expected 3 parts got %d", len(parts))
}
payload, err := base64.RawURLEncoding.DecodeString(parts[1])
if err != nil {
return "", fmt.Errorf("malformed jwt payload: %w", err)
}
return string(payload[:]), nil
}
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