mirror of
https://github.com/gravitational/teleport.git
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99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sqlserver
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import (
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"github.com/gravitational/teleport/lib/srv/db/common"
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"github.com/jcmturner/gokrb5/v8/client"
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"github.com/jcmturner/gokrb5/v8/config"
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"github.com/jcmturner/gokrb5/v8/keytab"
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"github.com/jcmturner/gokrb5/v8/spnego"
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"github.com/gravitational/trace"
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)
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// getAuth returns Kerberos authenticator used by SQL Server driver.
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//
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// TODO(r0mant): Unit-test this. In-memory Kerberos server?
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func (c *connector) getAuth(sessionCtx *common.Session) (*krbAuth, error) {
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// Load keytab.
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keytab, err := keytab.Load(sessionCtx.Database.GetAD().KeytabFile)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Load krb5.conf.
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config, err := config.Load(sessionCtx.Database.GetAD().Krb5File)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Create Kerberos client.
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client := client.NewWithKeytab(
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sessionCtx.DatabaseUser,
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sessionCtx.Database.GetAD().Domain,
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keytab,
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config,
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// Active Directory does not commonly support FAST negotiation.
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client.DisablePAFXFAST(true))
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// Login.
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err = client.Login()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Obtain service ticket for the database's Service Principal Name.
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ticket, encryptionKey, err := client.GetServiceTicket(sessionCtx.Database.GetAD().SPN)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Create init negotiation token.
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initToken, err := spnego.NewNegTokenInitKRB5(client, ticket, encryptionKey)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Marshal init negotiation token.
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initTokenBytes, err := initToken.Marshal()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return &krbAuth{
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initToken: initTokenBytes,
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}, nil
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}
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// krbAuth implements SQL Server driver's "auth" interface used during login
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// to provide Kerberos authentication.
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type krbAuth struct {
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initToken []byte
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}
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func (a *krbAuth) InitialBytes() ([]byte, error) {
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return a.initToken, nil
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}
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func (a *krbAuth) NextBytes(bytes []byte) ([]byte, error) {
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return nil, nil
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}
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func (a *krbAuth) Free() {}
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