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auth.go
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auth.go
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package auth
import (
"crypto/hmac"
"crypto/sha256"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"partisan/db"
"partisan/logger"
"partisan/models.v2/apptokens"
"partisan/models.v2/tickets"
"partisan/models.v2/users"
jwt "github.com/dgrijalva/jwt-go"
"github.com/jinzhu/gorm"
"github.com/nu7hatch/gouuid"
"github.com/gin-gonic/gin"
)
const (
hmacKeyPath = "keys/hmac.key"
)
// ErrNoUser signifies that the user couldn't be found in the context
var ErrNoUser = errors.New("User ID not set")
var hmacKey []byte
func init() {
var err error
hmacKey, err = ioutil.ReadFile(hmacKeyPath)
if err != nil {
// hmac doesn't exist, let's create one!
secret, err := uuid.NewV4()
if err != nil {
panic(fmt.Sprintf("Couldn't generate hmac key: %v", err))
}
h := hmac.New(sha256.New, []byte(secret.String()))
// create the file to write to
file, err := os.Create(hmacKeyPath)
if err != nil {
panic(fmt.Sprintf("Couldn't open hmac key file for writing: %v", err))
}
defer file.Close() // definitely make sure to close it
// write the hash to the file
if _, err := io.Copy(h, file); err != nil {
panic(fmt.Sprintf("Couldn't write hmac key to file: %v", err))
}
// try reading again, if not, we fucked up
hmacKey, err = ioutil.ReadFile(hmacKeyPath)
if err != nil {
panic("couldn't read hmac file")
}
}
}
// AppToken is middleware to make sure only Partisan approved products are accessing the API
func AppToken() gin.HandlerFunc {
return func(c *gin.Context) {
db := db.GetDB(c)
if err := getAppToken(c, db); err != nil {
logger.Error.Println("couldn't get app token:", err)
c.AbortWithError(http.StatusUnauthorized, err)
return
}
c.Next()
}
}
// Auth is the authentication middleware
func Auth() gin.HandlerFunc {
return func(c *gin.Context) {
db := db.GetDB(c)
user, err := getAuthToken(c, db)
if err != nil {
c.AbortWithError(http.StatusUnauthorized, err)
return
}
err = user.UpdateAPIKey()
if err != nil {
c.AbortWithError(http.StatusUnauthorized, err)
return
}
if err := db.Save(&user).Error; err != nil {
c.AbortWithError(http.StatusUnauthorized, err)
return
}
c.Set("user", user)
c.Next() // continue on to next endpoint
}
}
// Login a user
func Login(user *users.User, deviceToken string, c *gin.Context) (string, error) {
if err := user.UpdateAPIKey(); err != nil {
if err = user.GenAPIKey(); err != nil {
return "", err
}
}
user.DeviceToken = deviceToken // for push notifs
token := jwt.New(jwt.SigningMethodHS256)
// Set some claims
token.Claims["api_key"] = user.APIKey
// Sign and get the complete encoded token as a string
tokenString, err := token.SignedString(hmacKey)
return tokenString, err
}
// Logout a user
func Logout(u *users.User, c *gin.Context) {
u.DestroyAPIKey()
u.DeviceToken = "" // kill the device token when the user logs out
c.Status(http.StatusOK)
}
// CurrentUser gets the current user from the session
func CurrentUser(c *gin.Context) (u users.User, err error) {
defer func() {
if r := recover(); r != nil {
err = ErrNoUser
}
}()
user, ok := c.Get("user")
if !ok {
return users.User{}, ErrNoUser
}
u = user.(users.User)
return
}
func getAppToken(c *gin.Context, db *gorm.DB) error {
appToken, okAppToken := c.Request.Header["X-App-Token"]
if !okAppToken {
// if there's a socket ticket, continue. A bad socket ticket
// should be caught by Auth()
if _, ok := c.GetQuery("key"); !allowedWithKey(c) || !ok {
return ErrNoAppToken
}
} else {
appToken, err := apptokens.GetByID(appToken[0], db)
if err != nil {
return err
}
if !appToken.Active {
return ErrAppTokenRevoked
}
logger.Info.Println("Partisan being used by:", appToken)
}
return nil
}
func getAuthToken(c *gin.Context, db *gorm.DB) (user users.User, err error) {
tokn, okTok := c.Request.Header["X-Auth-Token"]
if okTok {
user, err = userWithToken(tokn[0], db)
if err != nil {
return
}
} else {
if key, ok := c.GetQuery("key"); allowedWithKey(c) && ok {
user, err = userWithKey(key, db)
if err != nil {
return
}
} else {
err = ErrNoToken
return
}
}
return
}
func userWithToken(tokn string, db *gorm.DB) (users.User, error) {
token, err := jwt.Parse(tokn, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return hmacKey, nil
})
if err != nil {
return users.User{}, err
}
key, err := uuid.ParseHex(token.Claims["api_key"].(string))
if err != nil {
return users.User{}, err
}
apiKey := key.String()
// Check this is the right user with correct API key
user, err := users.GetByAPIKey(apiKey, db)
if err != nil {
logger.Error.Println("couldn't find user with token:", tokn, "and apiKey:", apiKey)
return users.User{}, err
}
return user, nil
}
func userWithKey(key string, db *gorm.DB) (users.User, error) {
ticket, err := tickets.GetByID(key, db)
if err != nil {
return users.User{}, err
}
return users.GetByID(ticket.UserID, db)
}
func allowedWithKey(c *gin.Context) bool {
allowed := []string{
"partisan/api/v2.NotificationsCount",
"partisan/api/v2.MessageThreadSubscribe",
"partisan/api/v2.MessageUnread",
}
for _, v := range allowed {
if c.HandlerName() == v {
return true
}
}
return false
}