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