Synchronize SSH keys on login with LDAP + Fix SQLite deadlock on ldap ssh key deletion (#5557)

* Synchronize SSH keys on login with LDAP

* BUG: Fix hang on sqlite during LDAP key deletion

Author: zeripath

models/login_source.go

@@ -393,7 +393,13 @@ func LoginViaLDAP(user *User, login, password string, source *LoginSource, autoR
 		return nil, ErrUserNotExist{0, login, 0}
 	}
 
+	var isAttributeSSHPublicKeySet = len(strings.TrimSpace(source.LDAP().AttributeSSHPublicKey)) > 0
+
 	if !autoRegister {
+		if isAttributeSSHPublicKeySet && synchronizeLdapSSHPublicKeys(user, source, sr.SSHPublicKey) {
+			RewriteAllPublicKeys()
+		}
+
 		return user, nil
 	}
 
@@ -421,7 +427,14 @@ func LoginViaLDAP(user *User, login, password string, source *LoginSource, autoR
 		IsActive:    true,
 		IsAdmin:     sr.IsAdmin,
 	}
-	return user, CreateUser(user)
+
+	err := CreateUser(user)
+
+	if err == nil && isAttributeSSHPublicKeySet && addLdapSSHPublicKeys(user, source, sr.SSHPublicKey) {
+		RewriteAllPublicKeys()
+	}
+
+	return user, err
 }
 
 //   _________   __________________________

models/ssh_key.go

@@ -451,11 +451,9 @@ func GetPublicKeyByID(keyID int64) (*PublicKey, error) {
 	return key, nil
 }
 
-// SearchPublicKeyByContent searches content as prefix (leak e-mail part)
-// and returns public key found.
-func SearchPublicKeyByContent(content string) (*PublicKey, error) {
+func searchPublicKeyByContentWithEngine(e Engine, content string) (*PublicKey, error) {
 	key := new(PublicKey)
-	has, err := x.
+	has, err := e.
 		Where("content like ?", content+"%").
 		Get(key)
 	if err != nil {
@@ -466,6 +464,12 @@ func SearchPublicKeyByContent(content string) (*PublicKey, error) {
 	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(x, 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)

models/user.go

@@ -1402,7 +1402,7 @@ func deleteKeysMarkedForDeletion(keys []string) (bool, error) {
 	// Delete keys marked for deletion
 	var sshKeysNeedUpdate bool
 	for _, KeyToDelete := range keys {
-		key, err := SearchPublicKeyByContent(KeyToDelete)
+		key, err := searchPublicKeyByContentWithEngine(sess, KeyToDelete)
 		if err != nil {
 			log.Error(4, "SearchPublicKeyByContent: %v", err)
 			continue
@@ -1421,7 +1421,8 @@ func deleteKeysMarkedForDeletion(keys []string) (bool, error) {
 	return sshKeysNeedUpdate, nil
 }
 
-func addLdapSSHPublicKeys(s *LoginSource, usr *User, SSHPublicKeys []string) bool {
+// addLdapSSHPublicKeys add a users public keys. Returns true if there are changes.
+func addLdapSSHPublicKeys(usr *User, s *LoginSource, SSHPublicKeys []string) bool {
 	var sshKeysNeedUpdate bool
 	for _, sshKey := range SSHPublicKeys {
 		_, _, _, _, err := ssh.ParseAuthorizedKey([]byte(sshKey))
@@ -1440,7 +1441,8 @@ func addLdapSSHPublicKeys(s *LoginSource, usr *User, SSHPublicKeys []string) boo
 	return sshKeysNeedUpdate
 }
 
-func synchronizeLdapSSHPublicKeys(s *LoginSource, SSHPublicKeys []string, usr *User) bool {
+// synchronizeLdapSSHPublicKeys updates a users public keys. Returns true if there are changes.
+func synchronizeLdapSSHPublicKeys(usr *User, s *LoginSource, SSHPublicKeys []string) bool {
 	var sshKeysNeedUpdate bool
 
 	log.Trace("synchronizeLdapSSHPublicKeys[%s]: Handling LDAP Public SSH Key synchronization for user %s", s.Name, usr.Name)
@@ -1479,7 +1481,7 @@ func synchronizeLdapSSHPublicKeys(s *LoginSource, SSHPublicKeys []string, usr *U
 			newLdapSSHKeys = append(newLdapSSHKeys, LDAPPublicSSHKey)
 		}
 	}
-	if addLdapSSHPublicKeys(s, usr, newLdapSSHKeys) {
+	if addLdapSSHPublicKeys(usr, s, newLdapSSHKeys) {
 		sshKeysNeedUpdate = true
 	}
 
@@ -1581,15 +1583,15 @@ func SyncExternalUsers() {
 						log.Error(4, "SyncExternalUsers[%s]: Error creating user %s: %v", s.Name, su.Username, err)
 					} else if isAttributeSSHPublicKeySet {
 						log.Trace("SyncExternalUsers[%s]: Adding LDAP Public SSH Keys for user %s", s.Name, usr.Name)
-						if addLdapSSHPublicKeys(s, usr, su.SSHPublicKey) {
+						if addLdapSSHPublicKeys(usr, s, su.SSHPublicKey) {
 							sshKeysNeedUpdate = true
 						}
 					}
 				} else if updateExisting {
 					existingUsers = append(existingUsers, usr.ID)
 
 					// Synchronize SSH Public Key if that attribute is set
-					if isAttributeSSHPublicKeySet && synchronizeLdapSSHPublicKeys(s, su.SSHPublicKey, usr) {
+					if isAttributeSSHPublicKeySet && synchronizeLdapSSHPublicKeys(usr, s, su.SSHPublicKey) {
 						sshKeysNeedUpdate = true
 					}
 

modules/auth/ldap/ldap.go

@@ -247,10 +247,10 @@ func (ls *Source) SearchEntry(name, passwd string, directBind bool) *SearchResul
 		return nil
 	}
 
-	log.Trace("Fetching attributes '%v', '%v', '%v', '%v' with filter %s and base %s", ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail, userFilter, userDN)
+	log.Trace("Fetching attributes '%v', '%v', '%v', '%v', '%v' with filter %s and base %s", ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail, ls.AttributeSSHPublicKey, userFilter, userDN)
 	search := ldap.NewSearchRequest(
 		userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, userFilter,
-		[]string{ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail},
+		[]string{ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail, ls.AttributeSSHPublicKey},
 		nil)
 
 	sr, err := l.Search(search)
@@ -271,6 +271,7 @@ func (ls *Source) SearchEntry(name, passwd string, directBind bool) *SearchResul
 	firstname := sr.Entries[0].GetAttributeValue(ls.AttributeName)
 	surname := sr.Entries[0].GetAttributeValue(ls.AttributeSurname)
 	mail := sr.Entries[0].GetAttributeValue(ls.AttributeMail)
+	sshPublicKey := sr.Entries[0].GetAttributeValues(ls.AttributeSSHPublicKey)
 	isAdmin := checkAdmin(l, ls, userDN)
 
 	if !directBind && ls.AttributesInBind {
@@ -282,11 +283,12 @@ func (ls *Source) SearchEntry(name, passwd string, directBind bool) *SearchResul
 	}
 
 	return &SearchResult{
-		Username: username,
-		Name:     firstname,
-		Surname:  surname,
-		Mail:     mail,
-		IsAdmin:  isAdmin,
+		Username:     username,
+		Name:         firstname,
+		Surname:      surname,
+		Mail:         mail,
+		SSHPublicKey: sshPublicKey,
+		IsAdmin:      isAdmin,
 	}
 }