482 lines
13 KiB
Go
482 lines
13 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models
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import (
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"bytes"
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"container/list"
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"crypto"
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"encoding/base64"
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"fmt"
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"hash"
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"io"
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"strings"
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"time"
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"code.gitea.io/git"
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"code.gitea.io/gitea/modules/log"
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"github.com/go-xorm/xorm"
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"github.com/keybase/go-crypto/openpgp"
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"github.com/keybase/go-crypto/openpgp/armor"
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"github.com/keybase/go-crypto/openpgp/packet"
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)
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// GPGKey represents a GPG key.
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type GPGKey struct {
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ID int64 `xorm:"pk autoincr"`
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OwnerID int64 `xorm:"INDEX NOT NULL"`
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KeyID string `xorm:"INDEX CHAR(16) NOT NULL"`
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PrimaryKeyID string `xorm:"CHAR(16)"`
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Content string `xorm:"TEXT NOT NULL"`
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Created time.Time `xorm:"-"`
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CreatedUnix int64
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Expired time.Time `xorm:"-"`
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ExpiredUnix int64
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Added time.Time `xorm:"-"`
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AddedUnix int64
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SubsKey []*GPGKey `xorm:"-"`
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Emails []*EmailAddress
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CanSign bool
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CanEncryptComms bool
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CanEncryptStorage bool
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CanCertify bool
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}
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// BeforeInsert will be invoked by XORM before inserting a record
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func (key *GPGKey) BeforeInsert() {
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key.AddedUnix = time.Now().Unix()
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key.ExpiredUnix = key.Expired.Unix()
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key.CreatedUnix = key.Created.Unix()
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}
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// AfterLoad is invoked from XORM after setting the values of all fields of this object.
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func (key *GPGKey) AfterLoad(session *xorm.Session) {
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key.Added = time.Unix(key.AddedUnix, 0).Local()
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key.Expired = time.Unix(key.ExpiredUnix, 0).Local()
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key.Created = time.Unix(key.CreatedUnix, 0).Local()
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err := session.Where("primary_key_id=?", key.KeyID).Find(&key.SubsKey)
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if err != nil {
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log.Error(3, "Find Sub GPGkeys[%d]: %v", key.KeyID, err)
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}
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}
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// ListGPGKeys returns a list of public keys belongs to given user.
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func ListGPGKeys(uid int64) ([]*GPGKey, error) {
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keys := make([]*GPGKey, 0, 5)
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return keys, x.Where("owner_id=? AND primary_key_id=''", uid).Find(&keys)
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}
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// GetGPGKeyByID returns public key by given ID.
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func GetGPGKeyByID(keyID int64) (*GPGKey, error) {
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key := new(GPGKey)
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has, err := x.Id(keyID).Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrGPGKeyNotExist{keyID}
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}
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return key, nil
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}
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// checkArmoredGPGKeyString checks if the given key string is a valid GPG armored key.
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// The function returns the actual public key on success
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func checkArmoredGPGKeyString(content string) (*openpgp.Entity, error) {
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list, err := openpgp.ReadArmoredKeyRing(strings.NewReader(content))
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if err != nil {
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return nil, ErrGPGKeyParsing{err}
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}
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return list[0], nil
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}
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//addGPGKey add key and subkeys to database
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func addGPGKey(e Engine, key *GPGKey) (err error) {
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// Save GPG primary key.
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if _, err = e.Insert(key); err != nil {
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return err
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}
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// Save GPG subs key.
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for _, subkey := range key.SubsKey {
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if err := addGPGKey(e, subkey); err != nil {
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return err
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}
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}
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return nil
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}
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// AddGPGKey adds new public key to database.
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func AddGPGKey(ownerID int64, content string) (*GPGKey, error) {
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ekey, err := checkArmoredGPGKeyString(content)
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if err != nil {
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return nil, err
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}
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// Key ID cannot be duplicated.
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has, err := x.Where("key_id=?", ekey.PrimaryKey.KeyIdString()).
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Get(new(GPGKey))
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if err != nil {
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return nil, err
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} else if has {
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return nil, ErrGPGKeyIDAlreadyUsed{ekey.PrimaryKey.KeyIdString()}
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}
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//Get DB session
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sess := x.NewSession()
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defer sess.Close()
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if err = sess.Begin(); err != nil {
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return nil, err
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}
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key, err := parseGPGKey(ownerID, ekey)
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if err != nil {
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return nil, err
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}
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if err = addGPGKey(sess, key); err != nil {
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return nil, err
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}
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return key, sess.Commit()
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}
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//base64EncPubKey encode public kay content to base 64
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func base64EncPubKey(pubkey *packet.PublicKey) (string, error) {
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var w bytes.Buffer
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err := pubkey.Serialize(&w)
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if err != nil {
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return "", err
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}
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return base64.StdEncoding.EncodeToString(w.Bytes()), nil
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}
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//parseSubGPGKey parse a sub Key
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func parseSubGPGKey(ownerID int64, primaryID string, pubkey *packet.PublicKey, expiry time.Time) (*GPGKey, error) {
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content, err := base64EncPubKey(pubkey)
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if err != nil {
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return nil, err
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}
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return &GPGKey{
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OwnerID: ownerID,
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KeyID: pubkey.KeyIdString(),
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PrimaryKeyID: primaryID,
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Content: content,
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Created: pubkey.CreationTime,
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Expired: expiry,
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CanSign: pubkey.CanSign(),
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CanEncryptComms: pubkey.PubKeyAlgo.CanEncrypt(),
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CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
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CanCertify: pubkey.PubKeyAlgo.CanSign(),
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}, nil
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}
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//parseGPGKey parse a PrimaryKey entity (primary key + subs keys + self-signature)
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func parseGPGKey(ownerID int64, e *openpgp.Entity) (*GPGKey, error) {
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pubkey := e.PrimaryKey
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//Extract self-sign for expire date based on : https://github.com/golang/crypto/blob/master/openpgp/keys.go#L165
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var selfSig *packet.Signature
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for _, ident := range e.Identities {
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if selfSig == nil {
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selfSig = ident.SelfSignature
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} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
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selfSig = ident.SelfSignature
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break
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}
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}
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expiry := time.Time{}
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if selfSig.KeyLifetimeSecs != nil {
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expiry = selfSig.CreationTime.Add(time.Duration(*selfSig.KeyLifetimeSecs) * time.Second)
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}
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//Parse Subkeys
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subkeys := make([]*GPGKey, len(e.Subkeys))
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for i, k := range e.Subkeys {
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subs, err := parseSubGPGKey(ownerID, pubkey.KeyIdString(), k.PublicKey, expiry)
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if err != nil {
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return nil, err
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}
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subkeys[i] = subs
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}
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//Check emails
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userEmails, err := GetEmailAddresses(ownerID)
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if err != nil {
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return nil, err
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}
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emails := make([]*EmailAddress, 0, len(e.Identities))
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for _, ident := range e.Identities {
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email := strings.ToLower(strings.TrimSpace(ident.UserId.Email))
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for _, e := range userEmails {
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if e.Email == email {
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emails = append(emails, e)
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break
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}
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}
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}
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//In the case no email as been found
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if len(emails) == 0 {
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failedEmails := make([]string, 0, len(e.Identities))
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for _, ident := range e.Identities {
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failedEmails = append(failedEmails, ident.UserId.Email)
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}
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return nil, ErrGPGNoEmailFound{failedEmails}
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}
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content, err := base64EncPubKey(pubkey)
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if err != nil {
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return nil, err
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}
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return &GPGKey{
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OwnerID: ownerID,
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KeyID: pubkey.KeyIdString(),
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PrimaryKeyID: "",
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Content: content,
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Created: pubkey.CreationTime,
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Expired: expiry,
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Emails: emails,
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SubsKey: subkeys,
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CanSign: pubkey.CanSign(),
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CanEncryptComms: pubkey.PubKeyAlgo.CanEncrypt(),
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CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
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CanCertify: pubkey.PubKeyAlgo.CanSign(),
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}, nil
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}
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// deleteGPGKey does the actual key deletion
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func deleteGPGKey(e *xorm.Session, keyID string) (int64, error) {
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if keyID == "" {
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return 0, fmt.Errorf("empty KeyId forbidden") //Should never happen but just to be sure
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}
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return e.Where("key_id=?", keyID).Or("primary_key_id=?", keyID).Delete(new(GPGKey))
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}
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// DeleteGPGKey deletes GPG key information in database.
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func DeleteGPGKey(doer *User, id int64) (err error) {
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key, err := GetGPGKeyByID(id)
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if err != nil {
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if IsErrGPGKeyNotExist(err) {
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return nil
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}
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return fmt.Errorf("GetPublicKeyByID: %v", err)
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}
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// Check if user has access to delete this key.
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if !doer.IsAdmin && doer.ID != key.OwnerID {
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return ErrGPGKeyAccessDenied{doer.ID, key.ID}
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}
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sess := x.NewSession()
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defer sess.Close()
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if err = sess.Begin(); err != nil {
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return err
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}
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if _, err = deleteGPGKey(sess, key.KeyID); err != nil {
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return err
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}
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return sess.Commit()
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}
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// CommitVerification represents a commit validation of signature
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type CommitVerification struct {
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Verified bool
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Reason string
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SigningUser *User
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SigningKey *GPGKey
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}
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// SignCommit represents a commit with validation of signature.
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type SignCommit struct {
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Verification *CommitVerification
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*UserCommit
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}
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func readerFromBase64(s string) (io.Reader, error) {
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bs, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return nil, err
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}
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return bytes.NewBuffer(bs), nil
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}
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func populateHash(hashFunc crypto.Hash, msg []byte) (hash.Hash, error) {
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h := hashFunc.New()
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if _, err := h.Write(msg); err != nil {
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return nil, err
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}
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return h, nil
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}
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// readArmoredSign read an armored signature block with the given type. https://sourcegraph.com/github.com/golang/crypto/-/blob/openpgp/read.go#L24:6-24:17
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func readArmoredSign(r io.Reader) (body io.Reader, err error) {
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block, err := armor.Decode(r)
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if err != nil {
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return
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}
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if block.Type != openpgp.SignatureType {
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return nil, fmt.Errorf("expected '" + openpgp.SignatureType + "', got: " + block.Type)
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}
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return block.Body, nil
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}
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func extractSignature(s string) (*packet.Signature, error) {
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r, err := readArmoredSign(strings.NewReader(s))
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if err != nil {
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return nil, fmt.Errorf("Failed to read signature armor")
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}
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p, err := packet.Read(r)
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if err != nil {
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return nil, fmt.Errorf("Failed to read signature packet")
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}
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sig, ok := p.(*packet.Signature)
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if !ok {
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return nil, fmt.Errorf("Packet is not a signature")
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}
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return sig, nil
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}
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func verifySign(s *packet.Signature, h hash.Hash, k *GPGKey) error {
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//Check if key can sign
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if !k.CanSign {
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return fmt.Errorf("key can not sign")
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}
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//Decode key
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b, err := readerFromBase64(k.Content)
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if err != nil {
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return err
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}
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//Read key
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p, err := packet.Read(b)
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if err != nil {
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return err
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}
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//Check type
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pkey, ok := p.(*packet.PublicKey)
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if !ok {
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return fmt.Errorf("key is not a public key")
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}
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return pkey.VerifySignature(h, s)
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}
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// ParseCommitWithSignature check if signature is good against keystore.
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func ParseCommitWithSignature(c *git.Commit) *CommitVerification {
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if c.Signature != nil {
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//Parsing signature
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sig, err := extractSignature(c.Signature.Signature)
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if err != nil { //Skipping failed to extract sign
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log.Error(3, "SignatureRead err: %v", err)
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return &CommitVerification{
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Verified: false,
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Reason: "gpg.error.extract_sign",
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}
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}
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//Find Committer account
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committer, err := GetUserByEmail(c.Committer.Email) //This find the user by primary email or activated email so commit will not be valid if email is not
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if err != nil { //Skipping not user for commiter
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log.Error(3, "NoCommitterAccount: %v", err)
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return &CommitVerification{
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Verified: false,
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Reason: "gpg.error.no_committer_account",
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}
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}
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keys, err := ListGPGKeys(committer.ID)
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if err != nil { //Skipping failed to get gpg keys of user
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log.Error(3, "ListGPGKeys: %v", err)
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return &CommitVerification{
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Verified: false,
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Reason: "gpg.error.failed_retrieval_gpg_keys",
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}
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}
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for _, k := range keys {
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//Pre-check (& optimization) that emails attached to key can be attached to the commiter email and can validate
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canValidate := false
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for _, e := range k.Emails {
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if e.IsActivated && e.Email == c.Committer.Email {
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canValidate = true
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break
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}
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}
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if !canValidate {
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continue //Skip this key
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}
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//Generating hash of commit
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hash, err := populateHash(sig.Hash, []byte(c.Signature.Payload))
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if err != nil { //Skipping ailed to generate hash
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log.Error(3, "PopulateHash: %v", err)
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return &CommitVerification{
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Verified: false,
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Reason: "gpg.error.generate_hash",
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}
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}
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//We get PK
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if err := verifySign(sig, hash, k); err == nil {
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return &CommitVerification{ //Everything is ok
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Verified: true,
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Reason: fmt.Sprintf("%s <%s> / %s", c.Committer.Name, c.Committer.Email, k.KeyID),
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SigningUser: committer,
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SigningKey: k,
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}
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}
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//And test also SubsKey
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for _, sk := range k.SubsKey {
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//Generating hash of commit
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hash, err := populateHash(sig.Hash, []byte(c.Signature.Payload))
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if err != nil { //Skipping ailed to generate hash
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log.Error(3, "PopulateHash: %v", err)
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return &CommitVerification{
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Verified: false,
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Reason: "gpg.error.generate_hash",
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}
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}
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if err := verifySign(sig, hash, sk); err == nil {
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return &CommitVerification{ //Everything is ok
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Verified: true,
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Reason: fmt.Sprintf("%s <%s> / %s", c.Committer.Name, c.Committer.Email, sk.KeyID),
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SigningUser: committer,
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SigningKey: sk,
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}
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}
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}
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}
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return &CommitVerification{ //Default at this stage
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Verified: false,
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Reason: "gpg.error.no_gpg_keys_found",
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}
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}
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return &CommitVerification{
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Verified: false, //Default value
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Reason: "gpg.error.not_signed_commit", //Default value
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}
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}
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// ParseCommitsWithSignature checks if signaute of commits are corresponding to users gpg keys.
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func ParseCommitsWithSignature(oldCommits *list.List) *list.List {
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var (
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newCommits = list.New()
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e = oldCommits.Front()
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)
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for e != nil {
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c := e.Value.(UserCommit)
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newCommits.PushBack(SignCommit{
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UserCommit: &c,
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Verification: ParseCommitWithSignature(c.Commit),
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})
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e = e.Next()
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}
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return newCommits
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}
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