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119 lines
3.7 KiB
Go
119 lines
3.7 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Package licverifier implements a simple library to verify MinIO Subnet license keys.
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package licverifier
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import (
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"crypto/ecdsa"
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"errors"
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"fmt"
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"time"
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"github.com/dgrijalva/jwt-go"
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)
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// LicenseVerifier needs an ECDSA public key in PEM format for initialization.
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type LicenseVerifier struct {
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ecPubKey *ecdsa.PublicKey
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}
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// LicenseInfo holds customer metadata present in the license key.
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type LicenseInfo struct {
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Email string // Email of the license key requestor
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Organization string // Subnet organization name
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AccountID int64 // Subnet account id
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StorageCapacity int64 // Storage capacity used in TB
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Plan string // Subnet plan
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ExpiresAt time.Time // Time of license expiry
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}
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// license key JSON field names
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const (
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accountID = "aid"
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sub = "sub"
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expiresAt = "exp"
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organization = "org"
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capacity = "cap"
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plan = "plan"
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)
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// NewLicenseVerifier returns an initialized license verifier with the given
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// ECDSA public key in PEM format.
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func NewLicenseVerifier(pemBytes []byte) (*LicenseVerifier, error) {
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pbKey, err := jwt.ParseECPublicKeyFromPEM(pemBytes)
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if err != nil {
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return nil, fmt.Errorf("Failed to parse public key: %s", err)
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}
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return &LicenseVerifier{
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ecPubKey: pbKey,
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}, nil
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}
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// toLicenseInfo extracts LicenseInfo from claims. It returns an error if any of
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// the claim values are invalid.
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func toLicenseInfo(claims jwt.MapClaims) (LicenseInfo, error) {
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accID, ok := claims[accountID].(float64)
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if !ok || ok && accID <= 0 {
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return LicenseInfo{}, errors.New("Invalid accountId in claims")
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}
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email, ok := claims[sub].(string)
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if !ok {
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return LicenseInfo{}, errors.New("Invalid email in claims")
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}
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expiryTS, ok := claims[expiresAt].(float64)
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if !ok {
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return LicenseInfo{}, errors.New("Invalid time of expiry in claims")
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}
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expiresAt := time.Unix(int64(expiryTS), 0)
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orgName, ok := claims[organization].(string)
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if !ok {
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return LicenseInfo{}, errors.New("Invalid organization in claims")
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}
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storageCap, ok := claims[capacity].(float64)
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if !ok {
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return LicenseInfo{}, errors.New("Invalid storage capacity in claims")
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}
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plan, ok := claims[plan].(string)
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if !ok {
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return LicenseInfo{}, errors.New("Invalid plan in claims")
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}
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return LicenseInfo{
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Email: email,
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Organization: orgName,
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AccountID: int64(accID),
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StorageCapacity: int64(storageCap),
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Plan: plan,
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ExpiresAt: expiresAt,
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}, nil
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}
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// Verify verifies the license key and validates the claims present in it.
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func (lv *LicenseVerifier) Verify(license string) (LicenseInfo, error) {
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token, err := jwt.ParseWithClaims(license, &jwt.MapClaims{}, func(token *jwt.Token) (interface{}, error) {
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return lv.ecPubKey, nil
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})
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if err != nil {
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return LicenseInfo{}, fmt.Errorf("Failed to verify license: %s", err)
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}
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if claims, ok := token.Claims.(*jwt.MapClaims); ok && token.Valid {
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return toLicenseInfo(*claims)
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}
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return LicenseInfo{}, errors.New("Invalid claims found in license")
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}
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