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jwt.go
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jwt.go
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package v1
import (
"crypto/rand"
"fmt"
"net/http"
"os"
"strings"
"time"
jwt "github.com/appleboy/gin-jwt/v2"
"github.com/crowdsecurity/crowdsec/pkg/database"
"github.com/crowdsecurity/crowdsec/pkg/database/ent"
"github.com/crowdsecurity/crowdsec/pkg/database/ent/machine"
"github.com/crowdsecurity/crowdsec/pkg/models"
"github.com/crowdsecurity/crowdsec/pkg/types"
"github.com/gin-gonic/gin"
"github.com/go-openapi/strfmt"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/bcrypt"
)
var identityKey = "id"
type JWT struct {
Middleware *jwt.GinJWTMiddleware
DbClient *database.Client
TlsAuth *TLSAuth
}
func PayloadFunc(data interface{}) jwt.MapClaims {
if value, ok := data.(*models.WatcherAuthRequest); ok {
return jwt.MapClaims{
identityKey: &value.MachineID,
}
}
return jwt.MapClaims{}
}
func IdentityHandler(c *gin.Context) interface{} {
claims := jwt.ExtractClaims(c)
machineId := claims[identityKey].(string)
return &models.WatcherAuthRequest{
MachineID: &machineId,
}
}
func (j *JWT) Authenticator(c *gin.Context) (interface{}, error) {
var loginInput models.WatcherAuthRequest
var scenarios string
var err error
var scenariosInput []string
var clientMachine *ent.Machine
var machineID string
if c.Request.TLS != nil && len(c.Request.TLS.PeerCertificates) > 0 {
if j.TlsAuth == nil {
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return nil, errors.New("TLS auth is not configured")
}
validCert, extractedCN, err := j.TlsAuth.ValidateCert(c)
if err != nil {
log.Error(err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return nil, errors.Wrap(err, "while trying to validate client cert")
}
if !validCert {
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return nil, fmt.Errorf("failed cert authentication")
}
machineID = fmt.Sprintf("%s@%s", extractedCN, c.ClientIP())
clientMachine, err = j.DbClient.Ent.Machine.Query().
Where(machine.MachineId(machineID)).
First(j.DbClient.CTX)
if ent.IsNotFound(err) {
//Machine was not found, let's create it
log.Printf("machine %s not found, create it", machineID)
//let's use an apikey as the password, doesn't matter in this case (generatePassword is only available in cscli)
pwd, err := GenerateAPIKey(dummyAPIKeySize)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Errorf("error generating password: %s", err)
return nil, fmt.Errorf("error generating password")
}
password := strfmt.Password(pwd)
clientMachine, err = j.DbClient.CreateMachine(&machineID, &password, "", true, true, types.TlsAuthType)
if err != nil {
return "", errors.Wrapf(err, "while creating machine entry for %s", machineID)
}
} else if err != nil {
return "", errors.Wrapf(err, "while selecting machine entry for %s", machineID)
} else {
if clientMachine.AuthType != types.TlsAuthType {
return "", errors.Errorf("machine %s attempted to auth with TLS cert but it is configured to use %s", machineID, clientMachine.AuthType)
}
machineID = clientMachine.MachineId
loginInput := struct {
Scenarios []string `json:"scenarios"`
}{
Scenarios: []string{},
}
err := c.ShouldBindJSON(&loginInput)
if err != nil {
return "", errors.Wrap(err, "missing scenarios list in login request for TLS auth")
}
scenariosInput = loginInput.Scenarios
}
} else {
//normal auth
if err := c.ShouldBindJSON(&loginInput); err != nil {
return "", errors.Wrap(err, "missing")
}
if err := loginInput.Validate(strfmt.Default); err != nil {
return "", errors.New("input format error")
}
machineID = *loginInput.MachineID
password := *loginInput.Password
scenariosInput = loginInput.Scenarios
clientMachine, err = j.DbClient.Ent.Machine.Query().
Where(machine.MachineId(machineID)).
First(j.DbClient.CTX)
if err != nil {
log.Printf("Error machine login for %s : %+v ", machineID, err)
return nil, err
}
if clientMachine == nil {
log.Errorf("Nothing for '%s'", machineID)
return nil, jwt.ErrFailedAuthentication
}
if clientMachine.AuthType != types.PasswordAuthType {
return nil, errors.Errorf("machine %s attempted to auth with password but it is configured to use %s", machineID, clientMachine.AuthType)
}
if !clientMachine.IsValidated {
return nil, fmt.Errorf("machine %s not validated", machineID)
}
if err = bcrypt.CompareHashAndPassword([]byte(clientMachine.Password), []byte(password)); err != nil {
return nil, jwt.ErrFailedAuthentication
}
//end of normal auth
}
if len(scenariosInput) > 0 {
for _, scenario := range scenariosInput {
if scenarios == "" {
scenarios = scenario
} else {
scenarios += "," + scenario
}
}
err = j.DbClient.UpdateMachineScenarios(scenarios, clientMachine.ID)
if err != nil {
log.Errorf("Failed to update scenarios list for '%s': %s\n", machineID, err)
return nil, jwt.ErrFailedAuthentication
}
}
if clientMachine.IpAddress == "" {
err = j.DbClient.UpdateMachineIP(c.ClientIP(), clientMachine.ID)
if err != nil {
log.Errorf("Failed to update ip address for '%s': %s\n", machineID, err)
return nil, jwt.ErrFailedAuthentication
}
}
if clientMachine.IpAddress != c.ClientIP() && clientMachine.IpAddress != "" {
log.Warningf("new IP address detected for machine '%s': %s (old: %s)", clientMachine.MachineId, c.ClientIP(), clientMachine.IpAddress)
err = j.DbClient.UpdateMachineIP(c.ClientIP(), clientMachine.ID)
if err != nil {
log.Errorf("Failed to update ip address for '%s': %s\n", clientMachine.MachineId, err)
return nil, jwt.ErrFailedAuthentication
}
}
useragent := strings.Split(c.Request.UserAgent(), "/")
if len(useragent) != 2 {
log.Warningf("bad user agent '%s' from '%s'", c.Request.UserAgent(), c.ClientIP())
return nil, jwt.ErrFailedAuthentication
}
if err := j.DbClient.UpdateMachineVersion(useragent[1], clientMachine.ID); err != nil {
log.Errorf("unable to update machine '%s' version '%s': %s", clientMachine.MachineId, useragent[1], err)
log.Errorf("bad user agent from : %s", c.ClientIP())
return nil, jwt.ErrFailedAuthentication
}
return &models.WatcherAuthRequest{
MachineID: &machineID,
}, nil
}
func Authorizator(data interface{}, c *gin.Context) bool {
return true
}
func Unauthorized(c *gin.Context, code int, message string) {
c.JSON(code, gin.H{
"code": code,
"message": message,
})
}
func randomSecret() ([]byte, error) {
size := 64
secret := make([]byte, size)
n, err := rand.Read(secret)
if err != nil {
return nil, errors.New("unable to generate a new random seed for JWT generation")
}
if n != size {
return nil, errors.New("not enough entropy at random seed generation for JWT generation")
}
return secret, nil
}
func NewJWT(dbClient *database.Client) (*JWT, error) {
// Get secret from environment variable "SECRET"
var (
secret []byte
err error
)
// Please be aware that brute force HS256 is possible.
// PLEASE choose a STRONG secret
secretString := os.Getenv("CS_LAPI_SECRET")
secret = []byte(secretString)
switch l := len(secret); {
case l == 0:
secret, err = randomSecret()
if err != nil {
return &JWT{}, err
}
case l < 64:
return &JWT{}, errors.New("CS_LAPI_SECRET not strong enough")
}
jwtMiddleware := &JWT{
DbClient: dbClient,
TlsAuth: &TLSAuth{},
}
ret, err := jwt.New(&jwt.GinJWTMiddleware{
Realm: "Crowdsec API local",
Key: secret,
Timeout: time.Hour,
MaxRefresh: time.Hour,
IdentityKey: identityKey,
PayloadFunc: PayloadFunc,
IdentityHandler: IdentityHandler,
Authenticator: jwtMiddleware.Authenticator,
Authorizator: Authorizator,
Unauthorized: Unauthorized,
TokenLookup: "header: Authorization, query: token, cookie: jwt",
TokenHeadName: "Bearer",
TimeFunc: time.Now,
})
if err != nil {
return &JWT{}, err
}
errInit := ret.MiddlewareInit()
if errInit != nil {
return &JWT{}, fmt.Errorf("authMiddleware.MiddlewareInit() Error:" + errInit.Error())
}
jwtMiddleware.Middleware = ret
return jwtMiddleware, nil
}