/
steps.go
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/
steps.go
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package idp
import (
"context"
"crypto/sha256"
"encoding/base64"
"time"
"github.com/flynn/hubauth/pkg/clog"
"github.com/flynn/hubauth/pkg/hmacpb"
"github.com/flynn/hubauth/pkg/hubauth"
"github.com/flynn/hubauth/pkg/pb"
"github.com/flynn/hubauth/pkg/signpb"
"github.com/golang/protobuf/ptypes"
"go.opencensus.io/trace"
"go.uber.org/zap"
"golang.org/x/exp/errors"
"golang.org/x/exp/errors/fmt"
)
type steps struct {
db hubauth.DataStore
}
var _ idpSteps = (*steps)(nil)
func (s *steps) CreateCode(ctx context.Context, code *hubauth.Code) (string, string, error) {
return s.db.CreateCode(ctx, code)
}
type verifyCodeData struct {
ClientID string
RedirectURI string
CodeVerifier string
CodeID string
CodeSecret string
}
func (s *steps) VerifyCode(ctx context.Context, c *verifyCodeData) (*hubauth.Code, error) {
code, err := s.db.VerifyAndDeleteCode(ctx, c.CodeID, c.CodeSecret)
if err != nil {
if errors.Is(err, hubauth.ErrIncorrectCodeSecret) || errors.Is(err, hubauth.ErrNotFound) {
deleted, _ := s.db.DeleteRefreshTokensWithCode(ctx, c.CodeID)
if len(deleted) > 0 {
clog.Set(ctx, zap.Strings("deleted_refresh_tokens", deleted))
}
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "code is malformed or has already been exchanged",
}
}
return nil, fmt.Errorf("idp: error verifying and deleting code %s: %w", c.CodeID, err)
}
clog.Set(ctx,
zap.String("code_user_id", code.UserID),
zap.String("code_user_email", code.UserEmail),
)
if c.ClientID != code.ClientID {
clog.Set(ctx, zap.String("code_client_id", code.ClientID))
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "client_id mismatch",
}
}
if c.RedirectURI != code.RedirectURI {
clog.Set(ctx, zap.String("code_redirect_uri", code.RedirectURI))
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "redirect_uri mismatch",
}
}
chall := sha256.Sum256([]byte(c.CodeVerifier))
challenge := base64Encode(chall[:])
if code.PKCEChallenge != challenge {
clog.Set(ctx,
zap.String("code_challenge", code.PKCEChallenge),
zap.String("expected_challenge", challenge),
)
return nil, &hubauth.OAuthError{
Code: "invalid_request",
Description: "code_verifier mismatch",
}
}
return code, nil
}
type signCodeData struct {
Key string
Secret string
UserID string
UserEmail string
ExpiryTime time.Time
}
func (s *steps) SignCode(ctx context.Context, signKey hmacpb.Key, code *signCodeData) (string, error) {
keyBytes, err := base64Decode(code.Key)
if err != nil {
return "", fmt.Errorf("idp: error decoding key secret: %w", err)
}
secretBytes, err := base64Decode(code.Secret)
if err != nil {
return "", fmt.Errorf("idp: error decoding code secret: %w", err)
}
expireTime, _ := ptypes.TimestampProto(code.ExpiryTime)
res, err := hmacpb.SignMarshal(signKey, &pb.Code{
Key: keyBytes,
Secret: secretBytes,
UserId: code.UserID,
UserEmail: code.UserEmail,
ExpireTime: expireTime,
})
if err != nil {
return "", fmt.Errorf("idp: error encoding signing code: %w", err)
}
return base64Encode(res), nil
}
func (s *steps) VerifyAudience(ctx context.Context, audienceURL, clientID, userID string) error {
if audienceURL == "" {
return nil
}
audience, err := s.db.GetAudience(ctx, audienceURL)
if err != nil {
if errors.Is(err, hubauth.ErrNotFound) {
return &hubauth.OAuthError{
Code: "invalid_request",
Description: "unknown audience",
}
}
return fmt.Errorf("idp: error getting audience %s: %w", audienceURL, err)
}
foundClient := false
for _, c := range audience.ClientIDs {
if clientID == c {
foundClient = true
break
}
}
if !foundClient {
clog.Set(ctx, zap.Strings("audience_client_ids", audience.ClientIDs))
return &hubauth.OAuthError{
Code: "invalid_client",
Description: "unknown client for audience",
}
}
err = s.checkUser(ctx, audience, userID)
if errors.Is(err, hubauth.ErrUnauthorizedUser) {
return &hubauth.OAuthError{
Code: "access_denied",
Description: "user is not authorized for access",
}
}
return err
}
func (s *steps) VerifyUserGroups(ctx context.Context, userID string) error {
groups, err := s.db.GetCachedMemberGroups(ctx, userID)
if err != nil {
return fmt.Errorf("idp: error getting cached groups for user: %w", err)
}
if len(groups) == 0 {
return &hubauth.OAuthError{
Code: "access_denied",
Description: "unknown user",
}
}
return nil
}
func (s *steps) checkUser(ctx context.Context, cluster *hubauth.Audience, userID string) error {
groups, err := s.db.GetCachedMemberGroups(ctx, userID)
if err != nil {
return fmt.Errorf("idp: error getting cached groups for user: %w", err)
}
// TODO: log allowed groups and cached groups
allowed := false
outer:
for _, p := range cluster.UserGroups {
for _, allowedGroup := range p.Groups {
for _, g := range groups {
if g == allowedGroup {
allowed = true
clog.Set(ctx, zap.String("authorized_group", g))
break outer
}
}
}
}
if !allowed {
return hubauth.ErrUnauthorizedUser
}
return nil
}
type refreshTokenData struct {
Key string
IssueTime time.Time
UserID string
UserEmail string
ClientID string
}
type signedRefreshTokenData struct {
*refreshTokenData
ExpiryTime time.Time
}
func (s *steps) AllocateRefreshToken(ctx context.Context, clientID string) (string, error) {
return s.db.AllocateRefreshTokenID(ctx, clientID)
}
func (s *steps) SaveRefreshToken(ctx context.Context, codeID, redirectURI string, t *refreshTokenData) (*hubauth.Client, error) {
client, err := s.db.GetClient(ctx, t.ClientID)
if err != nil {
if errors.Is(err, hubauth.ErrNotFound) {
return nil, &hubauth.OAuthError{
Code: "invalid_client",
Description: "unknown client",
}
}
return nil, fmt.Errorf("idp: error getting client %s: %w", t.ClientID, err)
}
rt := &hubauth.RefreshToken{
ID: t.Key,
ClientID: t.ClientID,
UserID: t.UserID,
UserEmail: t.UserEmail,
RedirectURI: redirectURI,
CodeID: codeID,
IssueTime: t.IssueTime,
ExpiryTime: t.IssueTime.Add(client.RefreshTokenExpiry),
}
_, err = s.db.CreateRefreshToken(ctx, rt)
if err != nil {
return nil, fmt.Errorf("idp: error creating refresh token for code %s: %w", codeID, err)
}
clog.Set(ctx,
zap.Time("issued_refresh_token_expiry", rt.ExpiryTime),
zap.String("issued_refresh_token_id", rt.ID),
zap.Int("issued_refresh_token_version", 0),
)
return client, nil
}
func (s *steps) SignRefreshToken(ctx context.Context, signKey signpb.PrivateKey, t *signedRefreshTokenData) (string, error) {
ctx, span := trace.StartSpan(ctx, "idp.SignRefreshToken")
span.AddAttributes(
trace.StringAttribute("refresh_token_id", t.Key),
trace.StringAttribute("user_id", t.UserID),
trace.StringAttribute("refresh_token_issue_time", t.IssueTime.String()),
)
defer span.End()
keyBytes, err := base64Decode(t.Key)
if err != nil {
return "", fmt.Errorf("idp: error decoding refresh token key %q: %w", t.Key, err)
}
clientIDBytes, err := base64Decode(t.ClientID)
if err != nil {
return "", fmt.Errorf("idp: error decoding client id %q: %w", t.ClientID, err)
}
iss, _ := ptypes.TimestampProto(t.IssueTime)
exp, _ := ptypes.TimestampProto(t.ExpiryTime)
msg := &pb.RefreshToken{
Key: keyBytes,
IssueTime: iss,
UserId: t.UserID,
UserEmail: t.UserEmail,
ClientId: clientIDBytes,
ExpireTime: exp,
}
tokenBytes, err := signpb.SignMarshal(ctx, signKey, msg)
if err != nil {
return "", fmt.Errorf("idp: error signing refresh token: %w", err)
}
return base64Encode(tokenBytes), nil
}
func (s *steps) RenewRefreshToken(ctx context.Context, clientID, oldTokenID string, oldTokenIssueTime, now time.Time) (*hubauth.RefreshToken, error) {
newToken, err := s.db.RenewRefreshToken(ctx, clientID, oldTokenID, oldTokenIssueTime, now)
if err != nil {
switch {
case errors.Is(err, hubauth.ErrNotFound):
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "refresh_token not found",
}
case errors.Is(err, hubauth.ErrRefreshTokenVersionMismatch):
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "unexpected refresh_token issue time",
}
case errors.Is(err, hubauth.ErrClientIDMismatch):
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "client_id mismatch",
}
case errors.Is(err, hubauth.ErrExpired):
return nil, &hubauth.OAuthError{
Code: "invalid_grant",
Description: "refresh_token expired",
}
}
return nil, fmt.Errorf("idp: error renewing refresh token: %w", err)
}
clog.Set(ctx,
zap.String("issued_refresh_token_id", newToken.ID),
zap.Time("issued_refresh_token_issue_time", newToken.IssueTime),
zap.Time("issued_refresh_token_expiry", newToken.ExpiryTime),
)
return newToken, nil
}
func (s *steps) VerifyRefreshToken(ctx context.Context, rt *hubauth.RefreshToken, now time.Time) error {
dbToken, err := s.db.GetRefreshToken(ctx, rt.ID)
if err != nil {
if errors.Is(err, hubauth.ErrNotFound) {
return &hubauth.OAuthError{
Code: "invalid_grant",
Description: "refresh token not found",
}
}
return fmt.Errorf("idp: error getting refresh token %s: %w", rt.ID, err)
}
if !dbToken.IssueTime.Truncate(time.Millisecond).Equal(rt.IssueTime.Truncate(time.Millisecond)) {
return &hubauth.OAuthError{
Code: "invalid_grant",
Description: "unexpected refresh token issue time",
}
}
if now.After(dbToken.ExpiryTime) {
return &hubauth.OAuthError{
Code: "invalid_grant",
Description: "refresh_token expired",
}
}
return nil
}
type accessTokenData struct {
clientID string
userID string
userEmail string
}
func (s *steps) SignAccessToken(ctx context.Context, signKey signpb.PrivateKey, t *accessTokenData, now time.Time) (token string, err error) {
ctx, span := trace.StartSpan(ctx, "idp.SignAccessToken")
span.AddAttributes(
trace.StringAttribute("client_id", t.clientID),
trace.StringAttribute("user_id", t.userID),
trace.StringAttribute("user_email", t.userEmail),
)
defer span.End()
exp, _ := ptypes.TimestampProto(now.Add(accessTokenDuration))
iss, _ := ptypes.TimestampProto(now)
msg := &pb.AccessToken{
ClientId: t.clientID,
UserId: t.userID,
UserEmail: t.userEmail,
IssueTime: iss,
ExpireTime: exp,
}
tokenBytes, err := signpb.SignMarshal(ctx, signKey, msg)
if err != nil {
return "", fmt.Errorf("idp: error signing access token: %w", err)
}
idBytes := sha256.Sum256(tokenBytes)
token = base64.URLEncoding.EncodeToString(tokenBytes)
accessTokenID := base64Encode(idBytes[:])
span.AddAttributes(trace.StringAttribute("access_token_id", accessTokenID))
clog.Set(ctx,
zap.String("issued_access_token_id", accessTokenID),
zap.Duration("issued_access_token_expires_in", accessTokenDuration),
)
return token, nil
}