107 lines
3.5 KiB
Go
107 lines
3.5 KiB
Go
// Copyright 2021 CERN
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// In applying this license, CERN does not waive the privileges and immunities
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// granted to it by virtue of its status as an Intergovernmental Organization
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// or submit itself to any jurisdiction.
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package utils
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import (
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"crypto/tls"
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"crypto/x509"
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"os"
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"github.com/go-ldap/ldap/v3"
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"github.com/opencloud-eu/reva/v2/pkg/logger"
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ldapReconnect "github.com/opencloud-eu/reva/v2/pkg/utils/ldap"
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"github.com/pkg/errors"
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)
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// LDAPConn holds the basic parameter for setting up an
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// LDAP connection.
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type LDAPConn struct {
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URI string `mapstructure:"uri"`
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Insecure bool `mapstructure:"insecure"`
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CACert string `mapstructure:"cacert"`
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BindDN string `mapstructure:"bind_username"`
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BindPassword string `mapstructure:"bind_password"`
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}
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// GetLDAPClientWithReconnect initializes a long-lived LDAP connection that
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// automatically reconnects on connection errors. It allows to set TLS options
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// e.g. to add trusted Certificates or disable Certificate verification
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func GetLDAPClientWithReconnect(c *LDAPConn) (ldap.Client, error) {
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var tlsConf *tls.Config
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if c.Insecure {
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logger.New().Warn().Msg("SSL Certificate verification is disabled. This is strongly discouraged for production environments.")
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tlsConf = &tls.Config{
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//nolint:gosec // We need the ability to run with "insecure" (dev/testing)
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InsecureSkipVerify: true,
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}
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}
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if !c.Insecure && c.CACert != "" {
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if pemBytes, err := os.ReadFile(c.CACert); err == nil {
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rpool, _ := x509.SystemCertPool()
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rpool.AppendCertsFromPEM(pemBytes)
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tlsConf = &tls.Config{
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RootCAs: rpool,
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}
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} else {
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return nil, errors.Wrapf(err, "Error reading LDAP CA Cert '%s.'", c.CACert)
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}
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}
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conn := ldapReconnect.NewLDAPWithReconnect(
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ldapReconnect.Config{
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URI: c.URI,
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BindDN: c.BindDN,
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BindPassword: c.BindPassword,
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TLSConfig: tlsConf,
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},
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)
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return conn, nil
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}
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// GetLDAPClientForAuth initializes an LDAP connection. The connection is not authenticated
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// when returned. The main purpose for GetLDAPClientForAuth is to get and LDAP connection that
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// can be used to issue a single bind request to authenticate a user.
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func GetLDAPClientForAuth(c *LDAPConn) (ldap.Client, error) {
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var tlsConf *tls.Config
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if c.Insecure {
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logger.New().Warn().Msg("SSL Certificate verification is disabled. Is is strongly discouraged for production environments.")
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tlsConf = &tls.Config{
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//nolint:gosec // We need the ability to run with "insecure" (dev/testing)
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InsecureSkipVerify: true,
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}
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}
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if !c.Insecure && c.CACert != "" {
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if pemBytes, err := os.ReadFile(c.CACert); err == nil {
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rpool, _ := x509.SystemCertPool()
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rpool.AppendCertsFromPEM(pemBytes)
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tlsConf = &tls.Config{
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RootCAs: rpool,
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}
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} else {
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return nil, errors.Wrapf(err, "Error reading LDAP CA Cert '%s.'", c.CACert)
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}
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}
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l, err := ldap.DialURL(c.URI, ldap.DialWithTLSConfig(tlsConf))
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if err != nil {
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return nil, err
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}
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return l, nil
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}
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