475 lines
12 KiB
Go
475 lines
12 KiB
Go
package connector
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
|
|
"fmt"
|
|
|
|
"html/template"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"net/url"
|
|
"path"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/coreos/dex/pkg/log"
|
|
"github.com/coreos/go-oidc/oidc"
|
|
|
|
"gopkg.in/ldap.v2"
|
|
)
|
|
|
|
const (
|
|
LDAPConnectorType = "ldap"
|
|
LDAPLoginPageTemplateName = "ldap-login.html"
|
|
)
|
|
|
|
func init() {
|
|
RegisterConnectorConfigType(LDAPConnectorType, func() ConnectorConfig { return &LDAPConnectorConfig{} })
|
|
}
|
|
|
|
type LDAPConnectorConfig struct {
|
|
ID string `json:"id"`
|
|
ServerHost string `json:"serverHost"`
|
|
ServerPort uint16 `json:"serverPort"`
|
|
Timeout time.Duration `json:"timeout"`
|
|
UseTLS bool `json:"useTLS"`
|
|
UseSSL bool `json:"useSSL"`
|
|
CertFile string `json:"certFile"`
|
|
KeyFile string `json:"keyFile"`
|
|
CaFile string `json:"caFile"`
|
|
SkipCertVerification bool `json:"skipCertVerification"`
|
|
MaxIdleConn int `json:"maxIdleConn"`
|
|
BaseDN string `json:"baseDN"`
|
|
NameAttribute string `json:"nameAttribute"`
|
|
EmailAttribute string `json:"emailAttribute"`
|
|
SearchBeforeAuth bool `json:"searchBeforeAuth"`
|
|
SearchFilter string `json:"searchFilter"`
|
|
SearchScope string `json:"searchScope"`
|
|
SearchBindDN string `json:"searchBindDN"`
|
|
SearchBindPw string `json:"searchBindPw"`
|
|
BindTemplate string `json:"bindTemplate"`
|
|
TrustedEmailProvider bool `json:"trustedEmailProvider"`
|
|
}
|
|
|
|
func (cfg *LDAPConnectorConfig) ConnectorID() string {
|
|
return cfg.ID
|
|
}
|
|
|
|
func (cfg *LDAPConnectorConfig) ConnectorType() string {
|
|
return LDAPConnectorType
|
|
}
|
|
|
|
type LDAPConnector struct {
|
|
id string
|
|
idp *LDAPIdentityProvider
|
|
namespace url.URL
|
|
trustedEmailProvider bool
|
|
loginFunc oidc.LoginFunc
|
|
loginTpl *template.Template
|
|
}
|
|
|
|
func (cfg *LDAPConnectorConfig) Connector(ns url.URL, lf oidc.LoginFunc, tpls *template.Template) (Connector, error) {
|
|
ns.Path = path.Join(ns.Path, httpPathCallback)
|
|
tpl := tpls.Lookup(LDAPLoginPageTemplateName)
|
|
if tpl == nil {
|
|
return nil, fmt.Errorf("unable to find necessary HTML template")
|
|
}
|
|
|
|
// defaults
|
|
const defaultNameAttribute = "cn"
|
|
const defaultEmailAttribute = "mail"
|
|
const defaultBindTemplate = "uid=%u,%b"
|
|
const defaultSearchScope = ldap.ScopeWholeSubtree
|
|
const defaultMaxIdleConns = 5
|
|
const defaultPoolCheckTimer = 7200 * time.Second
|
|
|
|
if cfg.UseTLS && cfg.UseSSL {
|
|
return nil, fmt.Errorf("Invalid configuration. useTLS and useSSL are mutual exclusive.")
|
|
}
|
|
|
|
if len(cfg.CertFile) > 0 && len(cfg.KeyFile) == 0 {
|
|
return nil, fmt.Errorf("Invalid configuration. Both certFile and keyFile must be specified.")
|
|
}
|
|
|
|
nameAttribute := defaultNameAttribute
|
|
if len(cfg.NameAttribute) > 0 {
|
|
nameAttribute = cfg.NameAttribute
|
|
}
|
|
|
|
emailAttribute := defaultEmailAttribute
|
|
if len(cfg.EmailAttribute) > 0 {
|
|
emailAttribute = cfg.EmailAttribute
|
|
}
|
|
|
|
bindTemplate := defaultBindTemplate
|
|
if len(cfg.BindTemplate) > 0 {
|
|
if cfg.SearchBeforeAuth {
|
|
log.Warningf("bindTemplate not used when searchBeforeAuth specified.")
|
|
}
|
|
bindTemplate = cfg.BindTemplate
|
|
}
|
|
|
|
searchScope := defaultSearchScope
|
|
if len(cfg.SearchScope) > 0 {
|
|
switch {
|
|
case strings.EqualFold(cfg.SearchScope, "BASE"):
|
|
searchScope = ldap.ScopeBaseObject
|
|
case strings.EqualFold(cfg.SearchScope, "ONE"):
|
|
searchScope = ldap.ScopeSingleLevel
|
|
case strings.EqualFold(cfg.SearchScope, "SUB"):
|
|
searchScope = ldap.ScopeWholeSubtree
|
|
default:
|
|
return nil, fmt.Errorf("Invalid value for searchScope: '%v'. Must be one of 'base', 'one' or 'sub'.", cfg.SearchScope)
|
|
}
|
|
}
|
|
|
|
if cfg.Timeout != 0 {
|
|
ldap.DefaultTimeout = cfg.Timeout * time.Millisecond
|
|
}
|
|
|
|
tlsConfig := &tls.Config{
|
|
ServerName: cfg.ServerHost,
|
|
InsecureSkipVerify: cfg.SkipCertVerification,
|
|
}
|
|
|
|
if (cfg.UseTLS || cfg.UseSSL) && len(cfg.CaFile) > 0 {
|
|
buf, err := ioutil.ReadFile(cfg.CaFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rootCertPool := x509.NewCertPool()
|
|
ok := rootCertPool.AppendCertsFromPEM(buf)
|
|
if ok {
|
|
tlsConfig.RootCAs = rootCertPool
|
|
} else {
|
|
return nil, fmt.Errorf("%v: Unable to parse certificate data.", cfg.CaFile)
|
|
}
|
|
}
|
|
|
|
if (cfg.UseTLS || cfg.UseSSL) && len(cfg.CertFile) > 0 && len(cfg.KeyFile) > 0 {
|
|
cert, err := tls.LoadX509KeyPair(cfg.CertFile, cfg.KeyFile)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tlsConfig.Certificates = []tls.Certificate{cert}
|
|
}
|
|
|
|
maxIdleConn := defaultMaxIdleConns
|
|
if cfg.MaxIdleConn > 0 {
|
|
maxIdleConn = cfg.MaxIdleConn
|
|
}
|
|
|
|
ldapPool := &LDAPPool{
|
|
MaxIdleConn: maxIdleConn,
|
|
PoolCheckTimer: defaultPoolCheckTimer,
|
|
ServerHost: cfg.ServerHost,
|
|
ServerPort: cfg.ServerPort,
|
|
UseTLS: cfg.UseTLS,
|
|
UseSSL: cfg.UseSSL,
|
|
TLSConfig: tlsConfig,
|
|
}
|
|
|
|
idp := &LDAPIdentityProvider{
|
|
baseDN: cfg.BaseDN,
|
|
nameAttribute: nameAttribute,
|
|
emailAttribute: emailAttribute,
|
|
searchBeforeAuth: cfg.SearchBeforeAuth,
|
|
searchFilter: cfg.SearchFilter,
|
|
searchScope: searchScope,
|
|
searchBindDN: cfg.SearchBindDN,
|
|
searchBindPw: cfg.SearchBindPw,
|
|
bindTemplate: bindTemplate,
|
|
ldapPool: ldapPool,
|
|
}
|
|
|
|
idpc := &LDAPConnector{
|
|
id: cfg.ID,
|
|
idp: idp,
|
|
namespace: ns,
|
|
trustedEmailProvider: cfg.TrustedEmailProvider,
|
|
loginFunc: lf,
|
|
loginTpl: tpl,
|
|
}
|
|
|
|
return idpc, nil
|
|
}
|
|
|
|
func (c *LDAPConnector) ID() string {
|
|
return c.id
|
|
}
|
|
|
|
func (c *LDAPConnector) Healthy() error {
|
|
ldapConn, err := c.idp.ldapPool.Acquire()
|
|
if err == nil {
|
|
c.idp.ldapPool.Put(ldapConn)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (c *LDAPConnector) LoginURL(sessionKey, prompt string) (string, error) {
|
|
q := url.Values{}
|
|
q.Set("session_key", sessionKey)
|
|
q.Set("prompt", prompt)
|
|
enc := q.Encode()
|
|
|
|
return path.Join(c.namespace.Path, "login") + "?" + enc, nil
|
|
}
|
|
|
|
func (c *LDAPConnector) Register(mux *http.ServeMux, errorURL url.URL) {
|
|
route := path.Join(c.namespace.Path, "login")
|
|
mux.Handle(route, handleLoginFunc(c.loginFunc, c.loginTpl, c.idp, route, errorURL))
|
|
}
|
|
|
|
func (c *LDAPConnector) Sync() chan struct{} {
|
|
stop := make(chan struct{})
|
|
|
|
go func() {
|
|
for {
|
|
select {
|
|
case <-time.After(c.idp.ldapPool.PoolCheckTimer):
|
|
alive, killed := c.idp.ldapPool.CheckConnections()
|
|
if alive > 0 {
|
|
log.Infof("Connector ID=%v idle_conns=%v", c.id, alive)
|
|
}
|
|
if killed > 0 {
|
|
log.Warningf("Connector ID=%v closed %v dead connections.", c.id, killed)
|
|
}
|
|
case <-stop:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
return stop
|
|
}
|
|
|
|
func (c *LDAPConnector) TrustedEmailProvider() bool {
|
|
return c.trustedEmailProvider
|
|
}
|
|
|
|
// A LDAPPool is a Connection Pool for LDAP connections
|
|
// Initialize exported fields and use Acquire() to get a connection.
|
|
// Use Put() to put it back into the pool.
|
|
type LDAPPool struct {
|
|
m sync.Mutex
|
|
conns map[*ldap.Conn]struct{}
|
|
MaxIdleConn int
|
|
PoolCheckTimer time.Duration
|
|
ServerHost string
|
|
ServerPort uint16
|
|
UseTLS bool
|
|
UseSSL bool
|
|
TLSConfig *tls.Config
|
|
}
|
|
|
|
// Acquire removes and returns a random connection from the pool. A new connection is returned
|
|
// if there are no connections available in the pool.
|
|
func (p *LDAPPool) Acquire() (*ldap.Conn, error) {
|
|
conn := p.removeRandomConn()
|
|
if conn != nil {
|
|
return conn, nil
|
|
}
|
|
return p.ldapConnect()
|
|
}
|
|
|
|
// Put makes a connection ready for re-use and puts it back into the pool. If the connection
|
|
// cannot be reused it is discarded. If there already are MaxIdleConn connections in the pool
|
|
// the connection is discarded.
|
|
func (p *LDAPPool) Put(c *ldap.Conn) {
|
|
p.m.Lock()
|
|
if p.conns == nil {
|
|
// First call to Put, initialize map
|
|
p.conns = make(map[*ldap.Conn]struct{})
|
|
}
|
|
if len(p.conns)+1 > p.MaxIdleConn {
|
|
p.m.Unlock()
|
|
c.Close()
|
|
return
|
|
}
|
|
p.m.Unlock()
|
|
// drop to anonymous bind
|
|
err := c.Bind("", "")
|
|
if err != nil {
|
|
// unsupported or disallowed, throw away connection
|
|
log.Warningf("Unable to re-use LDAP Connection after failure to bind anonymously: %v", err)
|
|
c.Close()
|
|
return
|
|
}
|
|
p.m.Lock()
|
|
p.conns[c] = struct{}{}
|
|
p.m.Unlock()
|
|
}
|
|
|
|
// removeConn attempts to remove the provided connection from the pool. If removeConn returns false
|
|
// another routine is using the connection and the caller should discard the pointer.
|
|
func (p *LDAPPool) removeConn(conn *ldap.Conn) bool {
|
|
p.m.Lock()
|
|
_, ok := p.conns[conn]
|
|
delete(p.conns, conn)
|
|
p.m.Unlock()
|
|
return ok
|
|
}
|
|
|
|
// removeRandomConn attempts to remove a random connection from the pool. If removeRandomConn
|
|
// returns nil the pool is empty.
|
|
func (p *LDAPPool) removeRandomConn() *ldap.Conn {
|
|
p.m.Lock()
|
|
defer p.m.Unlock()
|
|
for conn := range p.conns {
|
|
delete(p.conns, conn)
|
|
return conn
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// CheckConnections attempts to iterate over all the connections in the pool and check wheter
|
|
// they are alive or not. Live connections are put back into the pool, dead ones are discarded.
|
|
func (p *LDAPPool) CheckConnections() (int, int) {
|
|
var conns []*ldap.Conn
|
|
var alive, killed int
|
|
|
|
// Get snapshot of connection-map while holding Lock
|
|
p.m.Lock()
|
|
for conn := range p.conns {
|
|
conns = append(conns, conn)
|
|
}
|
|
p.m.Unlock()
|
|
|
|
// Iterate over snapshot, Get and ping connections.
|
|
// Put live connections back into pool, Close dead ones.
|
|
for _, conn := range conns {
|
|
ok := p.removeConn(conn)
|
|
if ok {
|
|
err := ldapPing(conn)
|
|
if err == nil {
|
|
p.Put(conn)
|
|
alive++
|
|
} else {
|
|
conn.Close()
|
|
killed++
|
|
}
|
|
}
|
|
}
|
|
return alive, killed
|
|
}
|
|
|
|
func ldapPing(conn *ldap.Conn) error {
|
|
// Query root DSE
|
|
s := ldap.NewSearchRequest("", ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false, "(objectClass=*)", []string{}, nil)
|
|
_, err := conn.Search(s)
|
|
return err
|
|
}
|
|
|
|
type LDAPIdentityProvider struct {
|
|
baseDN string
|
|
nameAttribute string
|
|
emailAttribute string
|
|
searchBeforeAuth bool
|
|
searchFilter string
|
|
searchScope int
|
|
searchBindDN string
|
|
searchBindPw string
|
|
bindTemplate string
|
|
ldapPool *LDAPPool
|
|
}
|
|
|
|
func (p *LDAPPool) ldapConnect() (*ldap.Conn, error) {
|
|
var err error
|
|
var ldapConn *ldap.Conn
|
|
|
|
log.Debugf("LDAPConnect()")
|
|
if p.UseSSL {
|
|
ldapConn, err = ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", p.ServerHost, p.ServerPort), p.TLSConfig)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
ldapConn, err = ldap.Dial("tcp", fmt.Sprintf("%s:%d", p.ServerHost, p.ServerPort))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if p.UseTLS {
|
|
err = ldapConn.StartTLS(p.TLSConfig)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
return ldapConn, err
|
|
}
|
|
|
|
func (m *LDAPIdentityProvider) ParseString(template, username string) string {
|
|
result := template
|
|
result = strings.Replace(result, "%u", username, -1)
|
|
result = strings.Replace(result, "%b", m.baseDN, -1)
|
|
|
|
return result
|
|
}
|
|
|
|
func (m *LDAPIdentityProvider) Identity(username, password string) (*oidc.Identity, error) {
|
|
var err error
|
|
var bindDN, ldapUid, ldapName, ldapEmail string
|
|
var ldapConn *ldap.Conn
|
|
|
|
ldapConn, err = m.ldapPool.Acquire()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer m.ldapPool.Put(ldapConn)
|
|
|
|
if m.searchBeforeAuth {
|
|
err = ldapConn.Bind(m.searchBindDN, m.searchBindPw)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
filter := m.ParseString(m.searchFilter, username)
|
|
|
|
attributes := []string{
|
|
m.nameAttribute,
|
|
m.emailAttribute,
|
|
}
|
|
|
|
s := ldap.NewSearchRequest(m.baseDN, m.searchScope, ldap.NeverDerefAliases, 0, 0, false, filter, attributes, nil)
|
|
|
|
sr, err := ldapConn.Search(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(sr.Entries) == 0 {
|
|
err = fmt.Errorf("Search returned no match. filter='%v' base='%v'", filter, m.baseDN)
|
|
return nil, err
|
|
}
|
|
|
|
bindDN = sr.Entries[0].DN
|
|
ldapName = sr.Entries[0].GetAttributeValue(m.nameAttribute)
|
|
ldapEmail = sr.Entries[0].GetAttributeValue(m.emailAttribute)
|
|
|
|
// prepare LDAP connection for bind as user
|
|
m.ldapPool.Put(ldapConn)
|
|
ldapConn, err = m.ldapPool.Acquire()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
bindDN = m.ParseString(m.bindTemplate, username)
|
|
}
|
|
|
|
// authenticate user
|
|
err = ldapConn.Bind(bindDN, password)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ldapUid = bindDN
|
|
|
|
return &oidc.Identity{
|
|
ID: ldapUid,
|
|
Name: ldapName,
|
|
Email: ldapEmail,
|
|
}, nil
|
|
}
|