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server.go
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package keyshareserver
import (
"context"
"crypto/ecdsa"
"fmt"
"net/http"
"strings"
"time"
"github.com/go-co-op/gocron"
"github.com/go-errors/errors"
"github.com/golang-jwt/jwt/v4"
"github.com/hashicorp/go-multierror"
"github.com/privacybydesign/gabi"
"github.com/privacybydesign/gabi/big"
"github.com/privacybydesign/gabi/signed"
irma "github.com/privacybydesign/irmago"
"github.com/sirupsen/logrus"
"github.com/privacybydesign/irmago/internal/common"
"github.com/privacybydesign/irmago/internal/keysharecore"
"github.com/privacybydesign/irmago/server"
"github.com/privacybydesign/irmago/server/irmaserver"
"github.com/privacybydesign/irmago/server/keyshare"
"github.com/go-chi/chi/v5"
)
type Server struct {
// configuration
conf *Configuration
// external components
core *keysharecore.Core
irmaserv *irmaserver.Server
db DB
// Scheduler used to clean sessions
scheduler *gocron.Scheduler
// Session data, keeping track of current keyshare protocol session state for each user
store sessionStore
}
var errMissingCommitment = errors.New("missing previous call to getCommitments")
func New(conf *Configuration) (*Server, error) {
var err error
s := &Server{
conf: conf,
store: newMemorySessionStore(10 * time.Second),
scheduler: gocron.NewScheduler(time.UTC),
}
// Setup IRMA session server
s.irmaserv, err = irmaserver.New(conf.Configuration)
if err != nil {
return nil, err
}
// Process configuration and create keyshare core
err = validateConf(conf)
if err != nil {
return nil, err
}
if conf.DB != nil {
s.db = conf.DB
} else {
s.db, err = setupDatabase(conf)
if err != nil {
return nil, err
}
}
s.core, err = setupCore(conf)
if err != nil {
return nil, err
}
// Load Idemix keys into core, and ensure that new keys added in the future will be loaded as well.
if err = s.loadIdemixKeys(conf.IrmaConfiguration); err != nil {
return nil, err
}
conf.IrmaConfiguration.UpdateListeners = append(conf.IrmaConfiguration.UpdateListeners, func(c *irma.Configuration) {
if err := s.loadIdemixKeys(c); err != nil {
// run periodically; can only log the error here
_ = server.LogError(err)
}
})
// Setup session cache clearing
if _, err := s.scheduler.Every(10).Seconds().Do(s.store.flush); err != nil {
return nil, err
}
gocron.SetPanicHandler(server.GocronPanicHandler(s.conf.Logger))
s.scheduler.StartAsync()
return s, nil
}
func (s *Server) Stop() {
s.scheduler.Stop()
s.irmaserv.Stop()
}
func (s *Server) Handler() http.Handler {
router := chi.NewRouter()
router.Group(func(router chi.Router) {
router.Use(server.RecoverMiddleware)
router.Use(server.SizeLimitMiddleware)
router.Use(server.TimeoutMiddleware(nil, server.WriteTimeout))
opts := server.LogOptions{Response: true, Headers: true, From: false, EncodeBinary: true}
router.Use(server.LogMiddleware("keyshareserver", opts))
s.routeHandler(router)
router.Route("/api/v1", func(r chi.Router) {
s.routeHandler(r)
})
})
// IRMA server for issuing myirma credential during registration
router.Mount("/irma/", s.irmaserv.HandlerFunc())
return router
}
func (s *Server) routeHandler(r chi.Router) http.Handler {
// Registration
r.Post("/client/register", s.handleRegister)
// Authentication
r.Post("/users/verify_start", s.handleVerifyStart)
// The following two are so similar that they are both handled by handleVerify().
// NB: handleVerify() contains the strings "/users/verify/pin" and "/users/verify/pin_challengeresponse"
// to check, using its input, that the user has invoked the correct endpoint.
r.Post("/users/verify/pin", s.handleVerify)
r.Post("/users/verify/pin_challengeresponse", s.handleVerify)
// Other
r.Post("/users/change/pin", s.handleChangePin)
r.Post("/users/register_publickey", s.handleRegisterPublicKey)
// Keyshare sessions
r.Group(func(router chi.Router) {
router.Use(s.userMiddleware)
router.Use(s.authorizationMiddleware)
router.Post("/prove/getCommitments", s.handleCommitments)
router.Post("/prove/getResponse", s.handleResponse)
})
return r
}
// On configuration changes, update the keyshare core with all current public keys of the IRMA issuers.
func (s *Server) loadIdemixKeys(conf *irma.Configuration) error {
errs := multierror.Error{}
for _, issuer := range conf.Issuers {
keyIDs, err := conf.PublicKeyIndices(issuer.Identifier())
if err != nil {
errs.Errors = append(errs.Errors, errors.Errorf("issuer %v: could not find key IDs: %v", issuer, err))
continue
}
for _, id := range keyIDs {
key, err := conf.PublicKey(issuer.Identifier(), id)
if err != nil {
errs.Errors = append(errs.Errors, server.LogError(errors.Errorf("key %v-%v: could not fetch public key: %v", issuer, id, err)))
continue
}
s.core.DangerousAddTrustedPublicKey(irma.PublicKeyIdentifier{Issuer: issuer.Identifier(), Counter: id}, key)
}
}
return errs.ErrorOrNil()
}
// /prove/getCommitments
func (s *Server) handleCommitments(w http.ResponseWriter, r *http.Request) {
// Fetch from context
user := r.Context().Value("user").(*User)
authorization := r.Context().Value("authorization").(string)
// Read keys
var keys []irma.PublicKeyIdentifier
if err := server.ParseBody(r, &keys); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
if len(keys) == 0 {
s.conf.Logger.Info("Malformed request: no keys for commitment specified")
server.WriteError(w, server.ErrorInvalidRequest, "No key specified")
return
}
commitments, err := s.generateCommitments(user, authorization, keys)
if err != nil && (err == keysharecore.ErrInvalidChallenge || err == keysharecore.ErrInvalidJWT) {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
if err != nil {
// already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteJson(w, commitments)
}
func (s *Server) generateCommitments(user *User, authorization string, keys []irma.PublicKeyIdentifier) (*irma.ProofPCommitmentMap, error) {
// Generate commitments
commitments, commitID, err := s.core.GenerateCommitments(user.Secrets, authorization, keys)
if err != nil {
s.conf.Logger.WithField("error", err).Warn("Could not generate commitments for request")
return nil, err
}
// Prepare output message format
mappedCommitments := map[irma.PublicKeyIdentifier]*gabi.ProofPCommitment{}
for i, keyID := range keys {
mappedCommitments[keyID] = commitments[i]
}
// Store needed data for later requests.
// Of all keys involved in the current session, store the ID of the last one to be used when
// the user comes back later to retrieve her response. gabi.ProofP.P will depend on this public
// key, which is used only during issuance. Thus, this assumes that during issuance, the user
// puts the key ID of the credential(s) being issued at the last index (indeed, the irmaclient
// always puts all ProofU's after the ProofD's in the list of proofs it sends to the IRMA
// server).
s.store.add(user.Username, &session{
KeyID: keys[len(keys)-1],
CommitID: commitID,
})
// And send response
return &irma.ProofPCommitmentMap{Commitments: mappedCommitments}, nil
}
// /prove/getResponse
func (s *Server) handleResponse(w http.ResponseWriter, r *http.Request) {
// Fetch from context
user := r.Context().Value("user").(*User)
authorization := r.Context().Value("authorization").(string)
// Read challenge
challenge := new(big.Int)
if err := server.ParseBody(r, challenge); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
// verify access (avoids leaking whether there is a session ongoing to unauthorized callers)
if !r.Context().Value("hasValidAuthorization").(bool) {
s.conf.Logger.Warn("Could not generate keyshare response due to invalid authorization")
server.WriteError(w, server.ErrorInvalidRequest, "Invalid authorization")
return
}
// And do the actual responding
proofResponse, err := s.generateResponse(user, authorization, challenge)
if err != nil &&
(err == keysharecore.ErrInvalidChallenge ||
err == keysharecore.ErrInvalidJWT ||
err == errMissingCommitment) {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
if err != nil {
// already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteString(w, proofResponse)
}
func (s *Server) generateResponse(user *User, authorization string, challenge *big.Int) (string, error) {
// Get data from session
sessionData := s.store.get(user.Username)
if sessionData == nil {
s.conf.Logger.Warn("Request for response without previous call to get commitments")
return "", errMissingCommitment
}
// Indicate activity on user account
err := s.db.setSeen(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not mark user as seen recently")
// Do not send to user
}
// Make log entry
err = s.db.addLog(user, eventTypeIRMASession, nil)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not add log entry for user")
return "", err
}
proofResponse, err := s.core.GenerateResponse(user.Secrets, authorization, sessionData.CommitID, challenge, sessionData.KeyID)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not generate response for request")
return "", err
}
return proofResponse, nil
}
// /users/verify_start
func (s *Server) handleVerifyStart(w http.ResponseWriter, r *http.Request) {
// Extract request
var msg irma.KeyshareAuthRequest
if err := server.ParseBody(r, &msg); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
claims := &irma.KeyshareAuthRequestClaims{}
// We need the username inside the JWT here. The JWT is verified later within startAuth().
_, _, err := jwt.NewParser().ParseUnverified(msg.AuthRequestJWT, claims)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Failed to parse challenge-response JWT")
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
// Fetch user
user, err := s.db.user(claims.Username)
if err != nil {
s.conf.Logger.WithFields(logrus.Fields{"username": claims.Username, "error": err}).Warn("Could not find user in db")
server.WriteError(w, server.ErrorUserNotRegistered, "")
return
}
result, err := s.startAuth(user, msg.AuthRequestJWT)
if err != nil {
// already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteJson(w, result)
}
func (s *Server) startAuth(user *User, jwtt string) (irma.KeyshareAuthChallenge, error) {
challenge, err := s.core.GenerateChallenge(user.Secrets, jwtt)
if err != nil {
return irma.KeyshareAuthChallenge{}, err
}
return irma.KeyshareAuthChallenge{
Candidates: []string{irma.KeyshareAuthMethodChallengeResponse},
Challenge: challenge,
}, nil
}
// /users/verify/pin or /users/verify/pin_challengeresponse
func (s *Server) handleVerify(w http.ResponseWriter, r *http.Request) {
// Extract request
var msg irma.KeyshareAuthResponse
if err := server.ParseBody(r, &msg); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
var username string
if msg.AuthResponseJWT == "" {
if !strings.HasSuffix(r.URL.Path, "/users/verify/pin") {
server.WriteError(w, server.ErrorInvalidRequest, "wrong endpoint")
return
}
username = msg.Username
} else {
if !strings.HasSuffix(r.URL.Path, "/users/verify/pin_challengeresponse") {
server.WriteError(w, server.ErrorInvalidRequest, "wrong endpoint")
return
}
claims := &irma.KeyshareAuthResponseClaims{}
// We need the username inside the JWT here. The JWT is verified later within verifyAuth().
_, _, err := jwt.NewParser().ParseUnverified(msg.AuthResponseJWT, claims)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Failed to parse challenge-response JWT")
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
username = claims.Username
}
// Fetch user
user, err := s.db.user(username)
if err != nil {
s.conf.Logger.WithFields(logrus.Fields{"username": username, "error": err}).Warn("Could not find user in db")
server.WriteError(w, server.ErrorUserNotRegistered, "")
return
}
// and verify pin
result, err := s.verifyAuth(user, msg)
if err != nil {
// already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteJson(w, result)
}
func (s *Server) verifyAuth(user *User, msg irma.KeyshareAuthResponse) (irma.KeysharePinStatus, error) {
// Check whether pin check is currently allowed
ok, tries, wait, err := s.reservePinCheck(user)
if err != nil {
return irma.KeysharePinStatus{}, err
}
if !ok {
return irma.KeysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)}, nil
}
// At this point, we are allowed to do an actual check (we have successfully reserved a spot for it), so do it.
var jwtt string
if msg.AuthResponseJWT == "" {
jwtt, err = s.core.ValidateAuthLegacy(user.Secrets, msg.Pin)
} else {
jwtt, err = s.core.ValidateAuth(user.Secrets, msg.AuthResponseJWT)
}
if err != nil && err != keysharecore.ErrInvalidPin {
// Errors other than invalid pin are real errors
s.conf.Logger.WithField("error", err).Error("Could not validate pin")
return irma.KeysharePinStatus{}, err
}
if err == keysharecore.ErrInvalidPin {
// Handle invalid pin
err = s.db.addLog(user, eventTypePinCheckFailed, tries)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not add log entry for user")
return irma.KeysharePinStatus{}, err
}
if tries == 0 {
err = s.db.addLog(user, eventTypePinCheckBlocked, wait)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not add log entry for user")
return irma.KeysharePinStatus{}, err
}
return irma.KeysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)}, nil
} else {
return irma.KeysharePinStatus{Status: "failure", Message: fmt.Sprintf("%v", tries)}, nil
}
}
// Handle success
err = s.db.resetPinTries(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not reset users pin check logic")
// Do not send to user
}
err = s.db.setSeen(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not indicate user activity")
// Do not send to user
}
err = s.db.addLog(user, eventTypePinCheckSuccess, nil)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not add log entry for user")
return irma.KeysharePinStatus{}, err
}
return irma.KeysharePinStatus{Status: "success", Message: jwtt}, err
}
// /users/change/pin
func (s *Server) handleChangePin(w http.ResponseWriter, r *http.Request) {
// Extract request
var (
msg irma.KeyshareChangePin
err error
)
if err = server.ParseBody(r, &msg); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
if msg.ChangePinJWT == "" {
s.handleChangePinLegacy(w, msg.KeyshareChangePinData)
return
}
claims := &irma.KeyshareChangePinClaims{}
// We need the username inside the JWT here. The JWT is verified later within updatePin().
_, _, err = jwt.NewParser().ParseUnverified(msg.ChangePinJWT, claims)
if err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
user, err := s.db.user(claims.Username)
if err != nil {
s.conf.Logger.WithFields(logrus.Fields{"username": claims.Username, "error": err}).Warn("Could not find user in db")
server.WriteError(w, server.ErrorUserNotRegistered, "")
return
}
result, err := s.updatePin(user, msg.ChangePinJWT)
if err != nil {
// already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteJson(w, result)
}
func (s *Server) updatePin(user *User, jwtt string) (irma.KeysharePinStatus, error) {
// Check whether pin check is currently allowed
ok, tries, wait, err := s.reservePinCheck(user)
if err != nil {
return irma.KeysharePinStatus{}, err
}
if !ok {
return irma.KeysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)}, nil
}
// Try to do the update
user.Secrets, err = s.core.ChangePin(user.Secrets, jwtt)
if err == keysharecore.ErrInvalidPin {
if tries == 0 {
return irma.KeysharePinStatus{Status: "error", Message: fmt.Sprintf("%v", wait)}, nil
} else {
return irma.KeysharePinStatus{Status: "failure", Message: fmt.Sprintf("%v", tries)}, nil
}
} else if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not change pin")
return irma.KeysharePinStatus{}, err
}
// Mark pincheck as success, resetting users wait and count
err = s.db.resetPinTries(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not reset users pin check logic")
// Do not send to user
}
// Write user back
err = s.db.updateUser(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not write updated user to database")
return irma.KeysharePinStatus{}, err
}
return irma.KeysharePinStatus{Status: "success"}, nil
}
// /client/register
func (s *Server) handleRegister(w http.ResponseWriter, r *http.Request) {
// Extract request
var msg irma.KeyshareEnrollment
if err := server.ParseBody(r, &msg); err != nil {
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
sessionptr, err := s.register(msg)
if err == keysharecore.ErrPinTooLong || err == keyshare.ErrInvalidEmail {
// Too long pin or invalid email address is not an internal error
server.WriteError(w, server.ErrorInvalidRequest, err.Error())
return
}
if err == errTooManyTokens {
server.WriteError(w, server.ErrorTooManyRequests, err.Error())
return
}
if err != nil {
// Already logged
server.WriteError(w, server.ErrorInternal, err.Error())
return
}
server.WriteJson(w, sessionptr)
}
func (s *Server) parseRegistrationMessage(msg irma.KeyshareEnrollment) (*irma.KeyshareEnrollmentData, *ecdsa.PublicKey, error) {
if msg.EnrollmentJWT == "" {
return parseLegacyRegistrationMessage(msg)
}
var (
pk *ecdsa.PublicKey
err error
claims = &irma.KeyshareEnrollmentClaims{}
)
_, err = jwt.ParseWithClaims(msg.EnrollmentJWT, claims, func(token *jwt.Token) (interface{}, error) {
// Similar to a CSR, the JWT contains in its body the public key with which it is signed.
pk, err = signed.UnmarshalPublicKey(claims.KeyshareEnrollmentData.PublicKey)
return pk, err
})
if err != nil {
return nil, nil, err
}
return &claims.KeyshareEnrollmentData, pk, nil
}
func (s *Server) register(msg irma.KeyshareEnrollment) (*irma.Qr, error) {
// Generate keyshare server account
username := common.NewRandomString(12, common.AlphanumericChars)
data, pk, err := s.parseRegistrationMessage(msg)
if err != nil {
return nil, err
}
secrets, err := s.core.NewUserSecrets(data.Pin, pk)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not register user")
return nil, err
}
user := &User{Username: username, Language: data.Language, Secrets: secrets}
err = s.db.AddUser(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not store new user in database")
return nil, err
}
// Send email if user specified email address
if data.Email != nil && *data.Email != "" && s.conf.EmailServer != "" {
err = s.sendRegistrationEmail(user, data.Language, *data.Email)
if err != nil {
// already logged in sendRegistrationEmail
return nil, err
}
}
// Setup and return issuance session for keyshare credential.
request := irma.NewIssuanceRequest([]*irma.CredentialRequest{
{
CredentialTypeID: s.conf.KeyshareAttribute.CredentialTypeIdentifier(),
Attributes: map[string]string{
s.conf.KeyshareAttribute.Name(): username,
},
}})
sessionptr, _, _, err := s.irmaserv.StartSession(request, nil)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not start keyshare credential issuance sessions")
return nil, err
}
return sessionptr, nil
}
func (s *Server) sendRegistrationEmail(user *User, language, email string) error {
// Generate token
token := common.NewSessionToken()
// Add it to the database
err := s.db.addEmailVerification(user, email, token, s.conf.EmailTokenValidity)
if err != nil {
// Rate limiting errors do not need logging.
if err != errTooManyTokens {
s.conf.Logger.WithField("error", err).Error("Could not generate email verification mail record")
}
return err
}
verificationBaseURL := s.conf.TranslateString(s.conf.VerificationURL, language)
return s.conf.SendEmail(
s.conf.registrationEmailTemplates,
s.conf.RegistrationEmailSubjects,
map[string]string{"VerificationURL": verificationBaseURL + token},
email,
language,
)
}
func (s *Server) userMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Extract username from request
username := r.Header.Get("X-IRMA-Keyshare-Username")
// and fetch its information
user, err := s.db.user(username)
if err != nil {
s.conf.Logger.WithFields(logrus.Fields{"username": username, "error": err}).Warn("Could not find user in db")
server.WriteError(w, server.ErrorUserNotRegistered, err.Error())
return
}
next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "user", user)))
})
}
func (s *Server) authorizationMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Extract authorization from request
authorization := r.Header.Get("Authorization")
if strings.HasPrefix(authorization, "Bearer ") {
authorization = authorization[7:]
}
// verify access
ctx := r.Context()
err := s.core.ValidateJWT(ctx.Value("user").(*User).Secrets, authorization)
hasValidAuthorization := err == nil
// Construct new context with both authorization and its validity
nextContext := context.WithValue(
context.WithValue(ctx, "authorization", authorization),
"hasValidAuthorization", hasValidAuthorization)
next.ServeHTTP(w, r.WithContext(nextContext))
})
}
func (s *Server) reservePinCheck(user *User) (bool, int, int64, error) {
ok, tries, wait, err := s.db.reservePinTry(user)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not reserve pin check slot")
return false, 0, 0, err
}
if !ok {
err = s.db.addLog(user, eventTypePinCheckRefused, nil)
if err != nil {
s.conf.Logger.WithField("error", err).Error("Could not add log entry for user")
return false, 0, 0, err
}
return false, tries, wait, nil
}
return true, tries, wait, nil
}