forgejo-federation/models/gpg_key.go

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// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package models
import (
"bytes"
"encoding/base64"
"fmt"
"strings"
"time"
"github.com/go-xorm/xorm"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/packet"
)
// GPGKey represents a GPG key.
type GPGKey struct {
ID int64 `xorm:"pk autoincr"`
OwnerID int64 `xorm:"INDEX NOT NULL"`
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KeyID string `xorm:"INDEX CHAR(16) NOT NULL"`
PrimaryKeyID string `xorm:"CHAR(16)"`
Content string `xorm:"TEXT NOT NULL"`
Created time.Time `xorm:"-"`
CreatedUnix int64
Expired time.Time `xorm:"-"`
ExpiredUnix int64
Added time.Time `xorm:"-"`
AddedUnix int64
SubsKey []*GPGKey `xorm:"-"`
Emails []*EmailAddress
CanSign bool
CanEncryptComms bool
CanEncryptStorage bool
CanCertify bool
}
// BeforeInsert will be invoked by XORM before inserting a record
func (key *GPGKey) BeforeInsert() {
key.AddedUnix = time.Now().Unix()
key.ExpiredUnix = key.Expired.Unix()
key.CreatedUnix = key.Created.Unix()
}
// AfterSet is invoked from XORM after setting the value of a field of this object.
func (key *GPGKey) AfterSet(colName string, _ xorm.Cell) {
switch colName {
case "key_id":
x.Where("primary_key_id=?", key.KeyID).Find(&key.SubsKey)
case "added_unix":
key.Added = time.Unix(key.AddedUnix, 0).Local()
case "expired_unix":
key.Expired = time.Unix(key.ExpiredUnix, 0).Local()
case "created_unix":
key.Created = time.Unix(key.CreatedUnix, 0).Local()
}
}
// ListGPGKeys returns a list of public keys belongs to given user.
func ListGPGKeys(uid int64) ([]*GPGKey, error) {
keys := make([]*GPGKey, 0, 5)
return keys, x.Where("owner_id=? AND primary_key_id=''", uid).Find(&keys)
}
// GetGPGKeyByID returns public key by given ID.
func GetGPGKeyByID(keyID int64) (*GPGKey, error) {
key := new(GPGKey)
has, err := x.Id(keyID).Get(key)
if err != nil {
return nil, err
} else if !has {
return nil, ErrGPGKeyNotExist{keyID}
}
return key, nil
}
// checkArmoredGPGKeyString checks if the given key string is a valid GPG armored key.
// The function returns the actual public key on success
func checkArmoredGPGKeyString(content string) (*openpgp.Entity, error) {
list, err := openpgp.ReadArmoredKeyRing(strings.NewReader(content))
if err != nil {
return nil, err
}
return list[0], nil
}
//addGPGKey add key and subkeys to database
func addGPGKey(e Engine, key *GPGKey) (err error) {
// Save GPG primary key.
if _, err = e.Insert(key); err != nil {
return err
}
// Save GPG subs key.
for _, subkey := range key.SubsKey {
if err := addGPGKey(e, subkey); err != nil {
return err
}
}
return nil
}
// AddGPGKey adds new public key to database.
func AddGPGKey(ownerID int64, content string) (*GPGKey, error) {
ekey, err := checkArmoredGPGKeyString(content)
if err != nil {
return nil, err
}
// Key ID cannot be duplicated.
has, err := x.Where("key_id=?", ekey.PrimaryKey.KeyIdString()).
Get(new(GPGKey))
if err != nil {
return nil, err
} else if has {
return nil, ErrGPGKeyIDAlreadyUsed{ekey.PrimaryKey.KeyIdString()}
}
//Get DB session
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return nil, err
}
key, err := parseGPGKey(ownerID, ekey)
if err != nil {
return nil, err
}
if err = addGPGKey(sess, key); err != nil {
return nil, err
}
return key, sess.Commit()
}
//base64EncPubKey encode public kay content to base 64
func base64EncPubKey(pubkey *packet.PublicKey) (string, error) {
var w bytes.Buffer
err := pubkey.Serialize(&w)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(w.Bytes()), nil
}
//parseSubGPGKey parse a sub Key
func parseSubGPGKey(ownerID int64, primaryID string, pubkey *packet.PublicKey, expiry time.Time) (*GPGKey, error) {
content, err := base64EncPubKey(pubkey)
if err != nil {
return nil, err
}
return &GPGKey{
OwnerID: ownerID,
KeyID: pubkey.KeyIdString(),
PrimaryKeyID: primaryID,
Content: content,
Created: pubkey.CreationTime,
Expired: expiry,
CanSign: pubkey.CanSign(),
CanEncryptComms: pubkey.PubKeyAlgo.CanEncrypt(),
CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
CanCertify: pubkey.PubKeyAlgo.CanSign(),
}, nil
}
//parseGPGKey parse a PrimaryKey entity (primary key + subs keys + self-signature)
func parseGPGKey(ownerID int64, e *openpgp.Entity) (*GPGKey, error) {
pubkey := e.PrimaryKey
//Extract self-sign for expire date based on : https://github.com/golang/crypto/blob/master/openpgp/keys.go#L165
var selfSig *packet.Signature
for _, ident := range e.Identities {
if selfSig == nil {
selfSig = ident.SelfSignature
} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
selfSig = ident.SelfSignature
break
}
}
expiry := time.Time{}
if selfSig.KeyLifetimeSecs != nil {
expiry = selfSig.CreationTime.Add(time.Duration(*selfSig.KeyLifetimeSecs) * time.Second)
}
//Parse Subkeys
subkeys := make([]*GPGKey, len(e.Subkeys))
for i, k := range e.Subkeys {
subs, err := parseSubGPGKey(ownerID, pubkey.KeyIdString(), k.PublicKey, expiry)
if err != nil {
return nil, err
}
subkeys[i] = subs
}
//Check emails
userEmails, err := GetEmailAddresses(ownerID)
if err != nil {
return nil, err
}
emails := make([]*EmailAddress, len(e.Identities))
n := 0
for _, ident := range e.Identities {
for _, e := range userEmails {
if e.Email == ident.UserId.Email && e.IsActivated {
emails[n] = e
break
}
}
if emails[n] == nil {
return nil, fmt.Errorf("Failed to found email or is not confirmed : %s", ident.UserId.Email)
}
n++
}
content, err := base64EncPubKey(pubkey)
if err != nil {
return nil, err
}
return &GPGKey{
OwnerID: ownerID,
KeyID: pubkey.KeyIdString(),
PrimaryKeyID: "",
Content: content,
Created: pubkey.CreationTime,
Expired: expiry,
Emails: emails,
SubsKey: subkeys,
CanSign: pubkey.CanSign(),
CanEncryptComms: pubkey.PubKeyAlgo.CanEncrypt(),
CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
CanCertify: pubkey.PubKeyAlgo.CanSign(),
}, nil
}
// deleteGPGKey does the actual key deletion
func deleteGPGKey(e *xorm.Session, keyID string) (int64, error) {
if keyID == "" {
return 0, fmt.Errorf("empty KeyId forbidden") //Should never happen but just to be sure
}
return e.Where("key_id=?", keyID).Or("primary_key_id=?", keyID).Delete(new(GPGKey))
}
// DeleteGPGKey deletes GPG key information in database.
func DeleteGPGKey(doer *User, id int64) (err error) {
key, err := GetGPGKeyByID(id)
if err != nil {
if IsErrGPGKeyNotExist(err) {
return nil
}
return fmt.Errorf("GetPublicKeyByID: %v", err)
}
// Check if user has access to delete this key.
if !doer.IsAdmin && doer.ID != key.OwnerID {
return ErrGPGKeyAccessDenied{doer.ID, key.ID}
}
sess := x.NewSession()
defer sessionRelease(sess)
if err = sess.Begin(); err != nil {
return err
}
if _, err = deleteGPGKey(sess, key.KeyID); err != nil {
return err
}
if err = sess.Commit(); err != nil {
return err
}
return nil
}