headscale/preauth_keys.go

108 lines
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package headscale
import (
"crypto/rand"
"encoding/hex"
"log"
"time"
)
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const errorAuthKeyNotFound = Error("AuthKey not found")
const errorAuthKeyExpired = Error("AuthKey expired")
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// PreAuthKey describes a pre-authorization key usable in a particular namespace
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type PreAuthKey struct {
ID uint64 `gorm:"primary_key"`
Key string
NamespaceID uint
Namespace Namespace
Reusable bool
CreatedAt *time.Time
Expiration *time.Time
}
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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, 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
}
defer db.Close()
now := time.Now().UTC()
kstr, err := h.generateKey()
if err != nil {
return nil, err
}
k := PreAuthKey{
Key: kstr,
NamespaceID: n.ID,
Namespace: *n,
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Reusable: reusable,
CreatedAt: &now,
Expiration: expiration,
}
db.Save(&k)
return &k, nil
}
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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) {
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
}
defer db.Close()
keys := []PreAuthKey{}
if err := db.Preload("Namespace").Where(&PreAuthKey{NamespaceID: n.ID}).Find(&keys).Error; err != nil {
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return nil, err
}
return &keys, nil
}
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// 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
}
defer db.Close()
pak := PreAuthKey{}
if db.First(&pak, "key = ?", k).RecordNotFound() {
return nil, errorAuthKeyNotFound
}
if pak.Expiration != nil && pak.Expiration.Before(time.Now()) {
return nil, errorAuthKeyExpired
}
// missing here validation on current usage
return &pak, nil
}
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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
}