mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-23 18:15:26 +00:00
124 lines
2.9 KiB
Go
124 lines
2.9 KiB
Go
package headscale
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/hex"
|
|
"errors"
|
|
"log"
|
|
"time"
|
|
|
|
"gorm.io/gorm"
|
|
)
|
|
|
|
const errorAuthKeyNotFound = Error("AuthKey not found")
|
|
const errorAuthKeyExpired = Error("AuthKey expired")
|
|
const errorAuthKeyNotReusableAlreadyUsed = Error("AuthKey not reusable already used")
|
|
|
|
// PreAuthKey describes a pre-authorization key usable in a particular namespace
|
|
type PreAuthKey struct {
|
|
ID uint64 `gorm:"primary_key"`
|
|
Key string
|
|
NamespaceID uint
|
|
Namespace Namespace
|
|
Reusable bool
|
|
Ephemeral bool `gorm:"default:false"`
|
|
|
|
CreatedAt *time.Time
|
|
Expiration *time.Time
|
|
}
|
|
|
|
// CreatePreAuthKey creates a new PreAuthKey in a namespace, and returns it
|
|
func (h *Headscale) CreatePreAuthKey(namespaceName string, reusable bool, ephemeral bool, expiration *time.Time) (*PreAuthKey, error) {
|
|
n, err := h.GetNamespace(namespaceName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
db, err := h.db()
|
|
if err != nil {
|
|
log.Printf("Cannot open DB: %s", err)
|
|
return nil, err
|
|
}
|
|
|
|
now := time.Now().UTC()
|
|
kstr, err := h.generateKey()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
k := PreAuthKey{
|
|
Key: kstr,
|
|
NamespaceID: n.ID,
|
|
Namespace: *n,
|
|
Reusable: reusable,
|
|
Ephemeral: ephemeral,
|
|
CreatedAt: &now,
|
|
Expiration: expiration,
|
|
}
|
|
db.Save(&k)
|
|
|
|
return &k, nil
|
|
}
|
|
|
|
// GetPreAuthKeys returns the list of PreAuthKeys for a namespace
|
|
func (h *Headscale) GetPreAuthKeys(namespaceName string) (*[]PreAuthKey, error) {
|
|
n, err := h.GetNamespace(namespaceName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
db, err := h.db()
|
|
if err != nil {
|
|
log.Printf("Cannot open DB: %s", err)
|
|
return nil, err
|
|
}
|
|
|
|
keys := []PreAuthKey{}
|
|
if err := db.Preload("Namespace").Where(&PreAuthKey{NamespaceID: n.ID}).Find(&keys).Error; err != nil {
|
|
return nil, err
|
|
}
|
|
return &keys, nil
|
|
}
|
|
|
|
// checkKeyValidity does the heavy lifting for validation of the PreAuthKey coming from a node
|
|
// If returns no error and a PreAuthKey, it can be used
|
|
func (h *Headscale) checkKeyValidity(k string) (*PreAuthKey, error) {
|
|
db, err := h.db()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pak := PreAuthKey{}
|
|
if result := db.Preload("Namespace").First(&pak, "key = ?", k); errors.Is(result.Error, gorm.ErrRecordNotFound) {
|
|
return nil, errorAuthKeyNotFound
|
|
}
|
|
|
|
if pak.Expiration != nil && pak.Expiration.Before(time.Now()) {
|
|
return nil, errorAuthKeyExpired
|
|
}
|
|
|
|
if pak.Reusable || pak.Ephemeral { // we don't need to check if has been used before
|
|
return &pak, nil
|
|
}
|
|
|
|
machines := []Machine{}
|
|
if err := db.Preload("AuthKey").Where(&Machine{AuthKeyID: uint(pak.ID)}).Find(&machines).Error; err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(machines) != 0 {
|
|
return nil, errorAuthKeyNotReusableAlreadyUsed
|
|
}
|
|
|
|
// missing here validation on current usage
|
|
return &pak, nil
|
|
}
|
|
|
|
func (h *Headscale) generateKey() (string, error) {
|
|
size := 24
|
|
bytes := make([]byte, size)
|
|
if _, err := rand.Read(bytes); err != nil {
|
|
return "", err
|
|
}
|
|
return hex.EncodeToString(bytes), nil
|
|
}
|