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authenticator.go
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authenticator.go
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package main
import (
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"sync"
"time"
"github.com/gomodule/redigo/redis"
)
// Authenticator is used by Octyne's Connector to provide HTTP API authentication.
type Authenticator interface {
// Validate is called on an HTTP API request and checks whether or not the user is authenticated.
Validate(w http.ResponseWriter, r *http.Request) bool
// Login allows logging in a user and returning the token.
Login(username string, password string) string
// Logout allows logging out of a user and deleting the token from the server.
Logout(token string) bool
}
// RedisAuthenticator is an Authenticator implementation using Redis to store tokens.
type RedisAuthenticator struct {
Config
Redis *redis.Pool
}
// MemoryAuthenticator is an Authenticator implementation using an array to store tokens.
type MemoryAuthenticator struct {
Config
TokenMutex sync.RWMutex
Tokens map[string]string
}
// InitializeAuthenticator initializes an authenticator.
func InitializeAuthenticator(config Config) Authenticator {
// If Redis, create a Redis connection.
if config.Redis.Enabled {
return InitializeRedisAuthenticator(config)
}
// Create the authenticator.
authenticator := &MemoryAuthenticator{
Config: config,
Tokens: make(map[string]string),
}
return authenticator
}
// InitializeRedisAuthenticator initializes an authenticator using Redis.
func InitializeRedisAuthenticator(config Config) Authenticator {
pool := &redis.Pool{
Wait: true,
MaxIdle: 5,
MaxActive: 5,
Dial: func() (redis.Conn, error) {
conn, err := redis.DialURL(config.Redis.URL, redis.DialConnectTimeout(time.Second*60))
if err != nil {
log.Println("An error occurred when trying to connect to Redis!", err) // skipcq: GO-S0904
}
return conn, err
},
}
authenticator := &RedisAuthenticator{Config: config, Redis: pool}
return authenticator
}
func getTokenFromRequest(r *http.Request) string {
token := r.Header.Get("Authorization")
// For WebSockets, special case.
if r.Header.Get("Cookie") != "" && token == "" {
cookie, exists := r.Cookie("X-Authentication")
if exists == nil {
token = cookie.Value
}
}
return token
}
func isValidToken(token string) bool {
_, err := base64.StdEncoding.DecodeString(token)
return err == nil && len(token) == 128
}
// Validate is called on an HTTP API request and checks whether or not the user is authenticated.
func (a *MemoryAuthenticator) Validate(w http.ResponseWriter, r *http.Request) bool {
token := getTokenFromRequest(r)
if !isValidToken(token) {
http.Error(w, "{\"error\": \"You are not authenticated to access this resource!\"}",
http.StatusUnauthorized)
return false
}
// If valid, return true.
a.TokenMutex.RLock()
defer a.TokenMutex.RUnlock()
_, ok := a.Tokens[token]
if ok {
return true
}
http.Error(w, "{\"error\": \"You are not authenticated to access this resource!\"}",
http.StatusUnauthorized)
return false
}
// Validate is called on an HTTP API request and checks whether or not the user is authenticated.
func (a *RedisAuthenticator) Validate(w http.ResponseWriter, r *http.Request) bool {
token := getTokenFromRequest(r)
if !isValidToken(token) {
http.Error(w, "{\"error\": \"You are not authenticated to access this resource!\"}",
http.StatusUnauthorized)
return false
}
// Make request to Redis database.
conn := a.Redis.Get()
defer conn.Close()
res, err := redis.Int(conn.Do("EXISTS", "octyne-token:"+token))
if err != nil {
log.Println("An error occurred while making a request to Redis!", err) // skipcq: GO-S0904
http.Error(w, "{\"error\": \"Internal Server Error!\"}", http.StatusInternalServerError)
return false
}
if res != 1 {
http.Error(w, "{\"error\": \"You are not authenticated to access this resource!\"}",
http.StatusUnauthorized)
}
return res == 1
}
func checkValidLoginAndGenerateToken(username string, password string) string {
// Hash the password.
sha256sum := fmt.Sprintf("%x", sha256.Sum256([]byte(password)))
// Read users.json and check whether a user with such a username and password exists.
var users map[string]string
contents, err := ioutil.ReadFile("users.json")
if err != nil {
log.Println("An error occurred while attempting to read users.json!\n" + err.Error())
return ""
}
err = json.Unmarshal(contents, &users)
if err != nil {
log.Println("An error occurred while attempting to read users.json!\n" + err.Error())
return ""
}
// Check whether this user exists.
hashedPassword, exists := users[username]
if !exists || hashedPassword != sha256sum {
return ""
}
// Generate a token and return it.
token := make([]byte, 96)
rand.Read(token) // Tolerate errors here, an error here is incredibly unlikely: skipcq GSC-G104
return base64.StdEncoding.EncodeToString(token)
}
// Login allows logging in a user and returning the token.
func (a *MemoryAuthenticator) Login(username string, password string) string {
token := checkValidLoginAndGenerateToken(username, password)
if token == "" {
return ""
}
a.TokenMutex.Lock()
defer a.TokenMutex.Unlock()
a.Tokens[token] = username
return token
}
// Login allows logging in a user and returning the token.
func (a *RedisAuthenticator) Login(username string, password string) string {
token := checkValidLoginAndGenerateToken(username, password)
if token == "" {
return ""
}
conn := a.Redis.Get()
defer conn.Close()
_, err := conn.Do("SET", "octyne-token:"+token, username)
if err != nil {
log.Println("An error occurred while making a request to Redis for login!", err) // skipcq: GO-S0904
}
return token
}
// Logout allows logging out of a user and deleting the token from the server.
func (a *MemoryAuthenticator) Logout(token string) bool {
if !isValidToken(token) {
return false
}
a.TokenMutex.Lock()
defer a.TokenMutex.Unlock()
delete(a.Tokens, token)
return false
}
// Logout allows logging out of a user and deleting the token from the server.
func (a *RedisAuthenticator) Logout(token string) bool {
if !isValidToken(token) {
return false
}
conn := a.Redis.Get()
defer conn.Close()
res, err := redis.Int(conn.Do("DEL", "octyne-token:"+token))
if err != nil {
log.Println("An error occurred while making a request to Redis for logout!", err) // skipcq: GO-S0904
return false
}
return res == 1
}