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service.go
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service.go
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package mfa
import (
"bytes"
"context"
"crypto/rand"
"encoding/base32"
"encoding/base64"
"fmt"
"github.com/go-redis/redis"
"github.com/paysuper/mfa-service/pkg/proto"
"github.com/pquerna/otp"
"github.com/pquerna/otp/totp"
"go.uber.org/zap"
"image/png"
"net/url"
"regexp"
"strings"
)
const (
Version = "latest"
ServiceName = "p1mfa"
qrUrlPattern = "https://chart.googleapis.com/chart?cht=qr&chs=200x200&chl=%s"
mfaRecoveryStoragePattern = "mfa_recovery_%s_%s"
mfaSecretStoragePattern = "mfa_secret_%s"
ErrorSecretKeyNotExists = "Secret key not exists"
ErrorCodeInvalid = "Invalid code"
ErrorRequestPropertyRequired = "%s is required field"
)
type service struct {
redis *redis.Client
logger *zap.Logger
}
func NewService(redis *redis.Client, logger *zap.Logger) *service {
return &service{
redis: redis,
logger: logger,
}
}
func (s *service) Create(ctx context.Context, req *proto.MfaCreateDataRequest, res *proto.MfaCreateDataResponse) error {
if err := s.validateCreateRequest(req); err != nil {
s.logger.Error("Validate create request failed with error", zap.Error(err))
return err
}
an := req.UserID
if req.Email != "" {
an = req.Email
}
key, err := totp.Generate(totp.GenerateOpts{
Issuer: req.AppName,
AccountName: an,
})
if err != nil {
s.logger.Error("Generate a new TOTP Key failed with error", zap.Error(err))
return err
}
imageBased, err := s.generateBase64QrCode(key, int(req.QrSize))
if err != nil {
s.logger.Error("Generate base 64 qr code with error", zap.Error(err))
return err
}
codes, err := s.generateRecoveryCodes(10)
if err != nil {
s.logger.Error("Generate recovery codes failed with error", zap.Error(err))
return err
}
if err = s.redis.SAdd(s.GetRecoveryStorageKey(req.ProviderID, req.UserID), codes).Err(); err != nil {
s.logger.Error("Add recovery codes to Redis failed with error", zap.Error(err))
return err
}
if err = s.redis.HSet(s.GetSecretStorageKey(req.UserID), req.ProviderID, key.Secret()).Err(); err != nil {
s.logger.Error("Add secret codes to Redis failed with error", zap.Error(err))
return err
}
res.SecretKey = key.Secret()
res.URL = key.URL()
res.ImageBased = imageBased
res.QrCodeURL = fmt.Sprintf(qrUrlPattern, url.QueryEscape(key.URL()))
res.RecoveryCode = codes
return nil
}
func (s *service) Check(ctx context.Context, req *proto.MfaCheckDataRequest, res *proto.MfaCheckDataResponse) error {
if err := s.validateCheckRequest(req); err != nil {
s.logger.Error("Validate check request failed with error", zap.Error(err))
return err
}
res.Result = false
secret := s.redis.HGet(s.GetSecretStorageKey(req.UserID), req.ProviderID)
if secret.Err() != nil {
s.logger.Error("Getting secret key from Redis failed with error", zap.Error(secret.Err()))
res.Error = &proto.Error{
Message: ErrorSecretKeyNotExists,
}
return secret.Err()
}
if len(regexp.MustCompile("[0-9]{6}").FindStringSubmatch(req.Code)) > 0 {
res.Result = totp.Validate(req.Code, secret.Val())
if res.Result != false {
s.logger.Warn("Validating TOTP code format failed", zap.String("code", req.Code))
res.Error = &proto.Error{
Message: ErrorCodeInvalid,
}
}
} else {
r := s.redis.SRem(s.GetRecoveryStorageKey(req.UserID, req.ProviderID), req.Code)
if r.Err() != nil || r.Val() < 1 {
s.logger.Warn(
"Removing recovery code from Redis failed",
zap.Error(r.Err()),
zap.String("userId", req.UserID),
zap.String("providerId", req.ProviderID),
)
res.Error = &proto.Error{
Message: ErrorCodeInvalid,
}
} else {
res.Result = true
}
}
return nil
}
func (s *service) generateRecoveryCodes(count int) (codes []string, err error) {
secret := make([]byte, 10)
for i := 0; i < count; i++ {
if _, err := rand.Read(secret); err != nil {
return nil, err
}
codes = append(codes, strings.TrimRight(base32.StdEncoding.EncodeToString(secret), "="))
}
return codes, nil
}
func (s *service) generateBase64QrCode(key *otp.Key, size int) (string, error) {
if size == 0 {
size = 200
}
var buf bytes.Buffer
img, err := key.Image(size, size)
if err != nil {
return "", err
}
err = png.Encode(&buf, img)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(buf.Bytes()), nil
}
func (s *service) validateCreateRequest(req *proto.MfaCreateDataRequest) error {
if req.ProviderID == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "ProviderID")
}
if req.AppName == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "AppName")
}
if req.UserID == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "UserID")
}
return nil
}
func (s *service) validateCheckRequest(req *proto.MfaCheckDataRequest) error {
if req.ProviderID == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "ProviderID")
}
if req.UserID == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "UserID")
}
if req.Code == "" {
return fmt.Errorf(ErrorRequestPropertyRequired, "Code")
}
return nil
}
func (s *service) GetRecoveryStorageKey(userId string, ProviderID string) string {
return fmt.Sprintf(mfaRecoveryStoragePattern, userId, ProviderID)
}
func (s *service) GetSecretStorageKey(userId string) string {
return fmt.Sprintf(mfaSecretStoragePattern, userId)
}