gitea/models/ssh_key.go
zeripath 9302eba971
DBContext is just a Context (#17100)
* DBContext is just a Context

This PR removes some of the specialness from the DBContext and makes it context
This allows us to simplify the GetEngine code to wrap around any context in future
and means that we can change our loadRepo(e Engine) functions to simply take contexts.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix unit tests

Signed-off-by: Andrew Thornton <art27@cantab.net>

* another place that needs to set the initial context

Signed-off-by: Andrew Thornton <art27@cantab.net>

* avoid race

Signed-off-by: Andrew Thornton <art27@cantab.net>

* change attachment error

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-09-23 23:45:36 +08:00

494 lines
14 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 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 (
"fmt"
"strings"
"time"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
"golang.org/x/crypto/ssh"
"xorm.io/builder"
)
// KeyType specifies the key type
type KeyType int
const (
// KeyTypeUser specifies the user key
KeyTypeUser = iota + 1
// KeyTypeDeploy specifies the deploy key
KeyTypeDeploy
// KeyTypePrincipal specifies the authorized principal key
KeyTypePrincipal
)
// PublicKey represents a user or deploy SSH public key.
type PublicKey struct {
ID int64 `xorm:"pk autoincr"`
OwnerID int64 `xorm:"INDEX NOT NULL"`
Name string `xorm:"NOT NULL"`
Fingerprint string `xorm:"INDEX NOT NULL"`
Content string `xorm:"TEXT NOT NULL"`
Mode AccessMode `xorm:"NOT NULL DEFAULT 2"`
Type KeyType `xorm:"NOT NULL DEFAULT 1"`
LoginSourceID int64 `xorm:"NOT NULL DEFAULT 0"`
CreatedUnix timeutil.TimeStamp `xorm:"created"`
UpdatedUnix timeutil.TimeStamp `xorm:"updated"`
HasRecentActivity bool `xorm:"-"`
HasUsed bool `xorm:"-"`
}
func init() {
db.RegisterModel(new(PublicKey))
}
// AfterLoad is invoked from XORM after setting the values of all fields of this object.
func (key *PublicKey) AfterLoad() {
key.HasUsed = key.UpdatedUnix > key.CreatedUnix
key.HasRecentActivity = key.UpdatedUnix.AddDuration(7*24*time.Hour) > timeutil.TimeStampNow()
}
// OmitEmail returns content of public key without email address.
func (key *PublicKey) OmitEmail() string {
return strings.Join(strings.Split(key.Content, " ")[:2], " ")
}
// AuthorizedString returns formatted public key string for authorized_keys file.
//
// TODO: Consider dropping this function
func (key *PublicKey) AuthorizedString() string {
return AuthorizedStringForKey(key)
}
func addKey(e db.Engine, key *PublicKey) (err error) {
if len(key.Fingerprint) == 0 {
key.Fingerprint, err = calcFingerprint(key.Content)
if err != nil {
return err
}
}
// Save SSH key.
if _, err = e.Insert(key); err != nil {
return err
}
return appendAuthorizedKeysToFile(key)
}
// AddPublicKey adds new public key to database and authorized_keys file.
func AddPublicKey(ownerID int64, name, content string, loginSourceID int64) (*PublicKey, error) {
log.Trace(content)
fingerprint, err := calcFingerprint(content)
if err != nil {
return nil, err
}
sess := db.NewSession(db.DefaultContext)
defer sess.Close()
if err = sess.Begin(); err != nil {
return nil, err
}
if err := checkKeyFingerprint(sess, fingerprint); err != nil {
return nil, err
}
// Key name of same user cannot be duplicated.
has, err := sess.
Where("owner_id = ? AND name = ?", ownerID, name).
Get(new(PublicKey))
if err != nil {
return nil, err
} else if has {
return nil, ErrKeyNameAlreadyUsed{ownerID, name}
}
key := &PublicKey{
OwnerID: ownerID,
Name: name,
Fingerprint: fingerprint,
Content: content,
Mode: AccessModeWrite,
Type: KeyTypeUser,
LoginSourceID: loginSourceID,
}
if err = addKey(sess, key); err != nil {
return nil, fmt.Errorf("addKey: %v", err)
}
return key, sess.Commit()
}
// GetPublicKeyByID returns public key by given ID.
func GetPublicKeyByID(keyID int64) (*PublicKey, error) {
key := new(PublicKey)
has, err := db.GetEngine(db.DefaultContext).
ID(keyID).
Get(key)
if err != nil {
return nil, err
} else if !has {
return nil, ErrKeyNotExist{keyID}
}
return key, nil
}
func searchPublicKeyByContentWithEngine(e db.Engine, content string) (*PublicKey, error) {
key := new(PublicKey)
has, err := e.
Where("content like ?", content+"%").
Get(key)
if err != nil {
return nil, err
} else if !has {
return nil, ErrKeyNotExist{}
}
return key, nil
}
// SearchPublicKeyByContent searches content as prefix (leak e-mail part)
// and returns public key found.
func SearchPublicKeyByContent(content string) (*PublicKey, error) {
return searchPublicKeyByContentWithEngine(db.GetEngine(db.DefaultContext), content)
}
func searchPublicKeyByContentExactWithEngine(e db.Engine, content string) (*PublicKey, error) {
key := new(PublicKey)
has, err := e.
Where("content = ?", content).
Get(key)
if err != nil {
return nil, err
} else if !has {
return nil, ErrKeyNotExist{}
}
return key, nil
}
// SearchPublicKeyByContentExact searches content
// and returns public key found.
func SearchPublicKeyByContentExact(content string) (*PublicKey, error) {
return searchPublicKeyByContentExactWithEngine(db.GetEngine(db.DefaultContext), content)
}
// SearchPublicKey returns a list of public keys matching the provided arguments.
func SearchPublicKey(uid int64, fingerprint string) ([]*PublicKey, error) {
keys := make([]*PublicKey, 0, 5)
cond := builder.NewCond()
if uid != 0 {
cond = cond.And(builder.Eq{"owner_id": uid})
}
if fingerprint != "" {
cond = cond.And(builder.Eq{"fingerprint": fingerprint})
}
return keys, db.GetEngine(db.DefaultContext).Where(cond).Find(&keys)
}
// ListPublicKeys returns a list of public keys belongs to given user.
func ListPublicKeys(uid int64, listOptions ListOptions) ([]*PublicKey, error) {
sess := db.GetEngine(db.DefaultContext).Where("owner_id = ? AND type != ?", uid, KeyTypePrincipal)
if listOptions.Page != 0 {
sess = setSessionPagination(sess, &listOptions)
keys := make([]*PublicKey, 0, listOptions.PageSize)
return keys, sess.Find(&keys)
}
keys := make([]*PublicKey, 0, 5)
return keys, sess.Find(&keys)
}
// CountPublicKeys count public keys a user has
func CountPublicKeys(userID int64) (int64, error) {
sess := db.GetEngine(db.DefaultContext).Where("owner_id = ? AND type != ?", userID, KeyTypePrincipal)
return sess.Count(&PublicKey{})
}
// ListPublicKeysBySource returns a list of synchronized public keys for a given user and login source.
func ListPublicKeysBySource(uid, loginSourceID int64) ([]*PublicKey, error) {
keys := make([]*PublicKey, 0, 5)
return keys, db.GetEngine(db.DefaultContext).
Where("owner_id = ? AND login_source_id = ?", uid, loginSourceID).
Find(&keys)
}
// UpdatePublicKeyUpdated updates public key use time.
func UpdatePublicKeyUpdated(id int64) error {
// Check if key exists before update as affected rows count is unreliable
// and will return 0 affected rows if two updates are made at the same time
if cnt, err := db.GetEngine(db.DefaultContext).ID(id).Count(&PublicKey{}); err != nil {
return err
} else if cnt != 1 {
return ErrKeyNotExist{id}
}
_, err := db.GetEngine(db.DefaultContext).ID(id).Cols("updated_unix").Update(&PublicKey{
UpdatedUnix: timeutil.TimeStampNow(),
})
if err != nil {
return err
}
return nil
}
// deletePublicKeys does the actual key deletion but does not update authorized_keys file.
func deletePublicKeys(e db.Engine, keyIDs ...int64) error {
if len(keyIDs) == 0 {
return nil
}
_, err := e.In("id", keyIDs).Delete(new(PublicKey))
return err
}
// PublicKeysAreExternallyManaged returns whether the provided KeyID represents an externally managed Key
func PublicKeysAreExternallyManaged(keys []*PublicKey) ([]bool, error) {
sources := make([]*LoginSource, 0, 5)
externals := make([]bool, len(keys))
keyloop:
for i, key := range keys {
if key.LoginSourceID == 0 {
externals[i] = false
continue keyloop
}
var source *LoginSource
sourceloop:
for _, s := range sources {
if s.ID == key.LoginSourceID {
source = s
break sourceloop
}
}
if source == nil {
var err error
source, err = GetLoginSourceByID(key.LoginSourceID)
if err != nil {
if IsErrLoginSourceNotExist(err) {
externals[i] = false
sources[i] = &LoginSource{
ID: key.LoginSourceID,
}
continue keyloop
}
return nil, err
}
}
if sshKeyProvider, ok := source.Cfg.(SSHKeyProvider); ok && sshKeyProvider.ProvidesSSHKeys() {
// Disable setting SSH keys for this user
externals[i] = true
}
}
return externals, nil
}
// PublicKeyIsExternallyManaged returns whether the provided KeyID represents an externally managed Key
func PublicKeyIsExternallyManaged(id int64) (bool, error) {
key, err := GetPublicKeyByID(id)
if err != nil {
return false, err
}
if key.LoginSourceID == 0 {
return false, nil
}
source, err := GetLoginSourceByID(key.LoginSourceID)
if err != nil {
if IsErrLoginSourceNotExist(err) {
return false, nil
}
return false, err
}
if sshKeyProvider, ok := source.Cfg.(SSHKeyProvider); ok && sshKeyProvider.ProvidesSSHKeys() {
// Disable setting SSH keys for this user
return true, nil
}
return false, nil
}
// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
func DeletePublicKey(doer *User, id int64) (err error) {
key, err := GetPublicKeyByID(id)
if err != nil {
return err
}
// Check if user has access to delete this key.
if !doer.IsAdmin && doer.ID != key.OwnerID {
return ErrKeyAccessDenied{doer.ID, key.ID, "public"}
}
sess := db.NewSession(db.DefaultContext)
defer sess.Close()
if err = sess.Begin(); err != nil {
return err
}
if err = deletePublicKeys(sess, id); err != nil {
return err
}
if err = sess.Commit(); err != nil {
return err
}
sess.Close()
if key.Type == KeyTypePrincipal {
return RewriteAllPrincipalKeys()
}
return RewriteAllPublicKeys()
}
// deleteKeysMarkedForDeletion returns true if ssh keys needs update
func deleteKeysMarkedForDeletion(keys []string) (bool, error) {
// Start session
sess := db.NewSession(db.DefaultContext)
defer sess.Close()
if err := sess.Begin(); err != nil {
return false, err
}
// Delete keys marked for deletion
var sshKeysNeedUpdate bool
for _, KeyToDelete := range keys {
key, err := searchPublicKeyByContentWithEngine(sess, KeyToDelete)
if err != nil {
log.Error("SearchPublicKeyByContent: %v", err)
continue
}
if err = deletePublicKeys(sess, key.ID); err != nil {
log.Error("deletePublicKeys: %v", err)
continue
}
sshKeysNeedUpdate = true
}
if err := sess.Commit(); err != nil {
return false, err
}
return sshKeysNeedUpdate, nil
}
// AddPublicKeysBySource add a users public keys. Returns true if there are changes.
func AddPublicKeysBySource(usr *User, s *LoginSource, sshPublicKeys []string) bool {
var sshKeysNeedUpdate bool
for _, sshKey := range sshPublicKeys {
var err error
found := false
keys := []byte(sshKey)
loop:
for len(keys) > 0 && err == nil {
var out ssh.PublicKey
// We ignore options as they are not relevant to Gitea
out, _, _, keys, err = ssh.ParseAuthorizedKey(keys)
if err != nil {
break loop
}
found = true
marshalled := string(ssh.MarshalAuthorizedKey(out))
marshalled = marshalled[:len(marshalled)-1]
sshKeyName := fmt.Sprintf("%s-%s", s.Name, ssh.FingerprintSHA256(out))
if _, err := AddPublicKey(usr.ID, sshKeyName, marshalled, s.ID); err != nil {
if IsErrKeyAlreadyExist(err) {
log.Trace("AddPublicKeysBySource[%s]: Public SSH Key %s already exists for user", sshKeyName, usr.Name)
} else {
log.Error("AddPublicKeysBySource[%s]: Error adding Public SSH Key for user %s: %v", sshKeyName, usr.Name, err)
}
} else {
log.Trace("AddPublicKeysBySource[%s]: Added Public SSH Key for user %s", sshKeyName, usr.Name)
sshKeysNeedUpdate = true
}
}
if !found && err != nil {
log.Warn("AddPublicKeysBySource[%s]: Skipping invalid Public SSH Key for user %s: %v", s.Name, usr.Name, sshKey)
}
}
return sshKeysNeedUpdate
}
// SynchronizePublicKeys updates a users public keys. Returns true if there are changes.
func SynchronizePublicKeys(usr *User, s *LoginSource, sshPublicKeys []string) bool {
var sshKeysNeedUpdate bool
log.Trace("synchronizePublicKeys[%s]: Handling Public SSH Key synchronization for user %s", s.Name, usr.Name)
// Get Public Keys from DB with current LDAP source
var giteaKeys []string
keys, err := ListPublicKeysBySource(usr.ID, s.ID)
if err != nil {
log.Error("synchronizePublicKeys[%s]: Error listing Public SSH Keys for user %s: %v", s.Name, usr.Name, err)
}
for _, v := range keys {
giteaKeys = append(giteaKeys, v.OmitEmail())
}
// Process the provided keys to remove duplicates and name part
var providedKeys []string
for _, v := range sshPublicKeys {
sshKeySplit := strings.Split(v, " ")
if len(sshKeySplit) > 1 {
key := strings.Join(sshKeySplit[:2], " ")
if !util.ExistsInSlice(key, providedKeys) {
providedKeys = append(providedKeys, key)
}
}
}
// Check if Public Key sync is needed
if util.IsEqualSlice(giteaKeys, providedKeys) {
log.Trace("synchronizePublicKeys[%s]: Public Keys are already in sync for %s (Source:%v/DB:%v)", s.Name, usr.Name, len(providedKeys), len(giteaKeys))
return false
}
log.Trace("synchronizePublicKeys[%s]: Public Key needs update for user %s (Source:%v/DB:%v)", s.Name, usr.Name, len(providedKeys), len(giteaKeys))
// Add new Public SSH Keys that doesn't already exist in DB
var newKeys []string
for _, key := range providedKeys {
if !util.ExistsInSlice(key, giteaKeys) {
newKeys = append(newKeys, key)
}
}
if AddPublicKeysBySource(usr, s, newKeys) {
sshKeysNeedUpdate = true
}
// Mark keys from DB that no longer exist in the source for deletion
var giteaKeysToDelete []string
for _, giteaKey := range giteaKeys {
if !util.ExistsInSlice(giteaKey, providedKeys) {
log.Trace("synchronizePublicKeys[%s]: Marking Public SSH Key for deletion for user %s: %v", s.Name, usr.Name, giteaKey)
giteaKeysToDelete = append(giteaKeysToDelete, giteaKey)
}
}
// Delete keys from DB that no longer exist in the source
needUpd, err := deleteKeysMarkedForDeletion(giteaKeysToDelete)
if err != nil {
log.Error("synchronizePublicKeys[%s]: Error deleting Public Keys marked for deletion for user %s: %v", s.Name, usr.Name, err)
}
if needUpd {
sshKeysNeedUpdate = true
}
return sshKeysNeedUpdate
}