func NewLdapConnection() (*ldap.Conn, error) {
var err error
lh, err := ldapHost()
if err != nil {
logger.Log(kv{"fn": "NewLdapConnection", "error": err.Error()})
}
hoster := strings.Split(lh.Host, ":")
port := func() uint16 {
if len(hoster) < 2 {
return uint16(389)
} else {
var e error
port, e := strconv.Atoi(hoster[1])
if e != nil {
panic(e)
}
return uint16(port)
}
}
var ldapCon *ldap.Conn
if strings.Contains(lh.String(), "ldaps") {
ldapCon, err = ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", hoster[0], port()), &tls.Config{InsecureSkipVerify: true})
} else {
ldapCon, err = ldap.Dial("tcp", fmt.Sprintf("%s:%d", hoster[0], port()))
}
if err != nil {
logger.Log(kv{"fn": "NewLdapConnection", "error": err.Error()})
return nil, err
}
return ldapCon, nil
}
func (h ldapHandler) getSession(conn net.Conn) (ldapSession, error) {
id := connID(conn)
h.lock.Lock()
s, ok := h.sessions[id] // use server connection if it exists
h.lock.Unlock()
if !ok { // open a new server connection if not
var l *ldap.Conn
server, err := h.getBestServer() // pick the best server
if err != nil {
return ldapSession{}, err
}
dest := fmt.Sprintf("%s:%d", server.Hostname, server.Port)
if server.Scheme == "ldaps" {
tlsCfg := &tls.Config{}
if h.cfg.Backend.Insecure {
tlsCfg.InsecureSkipVerify = true
}
l, err = ldap.DialTLS("tcp", dest, tlsCfg)
} else if server.Scheme == "ldap" {
l, err = ldap.Dial("tcp", dest)
}
if err != nil {
select {
case h.doPing <- true: // non-blocking send
default:
}
return ldapSession{}, err
}
s = ldapSession{id: id, c: conn, ldap: l}
h.lock.Lock()
h.sessions[s.id] = s
h.lock.Unlock()
}
return s, nil
}
func (h ldapHandler) ping() error {
healthy := false
for k, s := range h.servers {
var l *ldap.Conn
var err error
dest := fmt.Sprintf("%s:%d", s.Hostname, s.Port)
start := time.Now()
if h.servers[0].Scheme == "ldaps" {
tlsCfg := &tls.Config{}
if h.cfg.Backend.Insecure {
tlsCfg.InsecureSkipVerify = true
}
l, err = ldap.DialTLS("tcp", dest, tlsCfg)
} else if h.servers[0].Scheme == "ldap" {
l, err = ldap.Dial("tcp", dest)
}
elapsed := time.Since(start)
h.lock.Lock()
if err != nil || l == nil {
log.Error(fmt.Sprintf("Server %s:%d ping failed: %s", s.Hostname, s.Port, err.Error()))
h.servers[k].Ping = 0
h.servers[k].Status = Down
} else {
healthy = true
h.servers[k].Ping = elapsed
h.servers[k].Status = Up
l.Close() // prank caller
}
h.lock.Unlock()
}
log.Debug("Server health: %# v", pretty.Formatter(h.servers))
b, err := json.Marshal(h.servers)
if err != nil {
log.Error(fmt.Sprintf("Error encoding tail data: %s", err.Error()))
}
stats_backend.Set("servers", stringer(string(b)))
if healthy == false {
return fmt.Errorf("No healthy servers")
}
return nil
}
func main() {
l, err := ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", LdapServer, LdapPort), nil)
if err != nil {
log.Fatalf("ERROR: %s\n", err.Error())
}
defer l.Close()
// l.Debug = true
search := ldap.NewSearchRequest(
BaseDN,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
Filter,
Attributes,
nil)
sr, err := l.Search(search)
if err != nil {
log.Fatalf("ERROR: %s\n", err.Error())
return
}
log.Printf("Search: %s -> num of entries = %d\n", search.Filter, len(sr.Entries))
sr.PrettyPrint(0)
}
func main() {
// Parse command-line flags for this system.
var (
listenAddress = flag.String("addr", "", "Address to listen to incoming requests on.")
ldapAddress = flag.String("ldapAddr", "", "Address to connect to LDAP.")
ldapBindDN = flag.String("ldapBindDN", "", "LDAP DN to bind to for login.")
ldapInsecure = flag.Bool("insecureLDAP", false, "INSECURE: Don't use TLS for LDAP connection.")
ldapBindPassword = flag.String("ldapBindPassword", "", "LDAP password for bind.")
statsdHost = flag.String("statsHost", "", "Address to send statsd metrics to.")
iamAccount = flag.String("iamaccount", "", "AWS Account ID for generating IAM Role ARNs")
enableLDAPRoles = flag.Bool("ldaproles", false, "Enable role support using LDAP directory.")
roleAttribute = flag.String("roleattribute", "", "Group attribute to get role from.")
defaultRole = flag.String("role", "", "AWS role to assume by default.")
configFile = flag.String("conf", "/etc/hologram/server.json", "Config file to load.")
cacheTimeout = flag.Int("cachetime", 3600, "Time in seconds after which to refresh LDAP user cache.")
debugMode = flag.Bool("debug", false, "Enable debug mode.")
config Config
)
flag.Parse()
// Enable debug log output if the user requested it.
if *debugMode {
log.DebugMode(true)
log.Debug("Enabling debug log output. Use sparingly.")
}
// Parse in options from the given config file.
log.Debug("Loading configuration from %s", *configFile)
configContents, configErr := ioutil.ReadFile(*configFile)
if configErr != nil {
log.Errorf("Could not read from config file. The error was: %s", configErr.Error())
os.Exit(1)
}
configParseErr := json.Unmarshal(configContents, &config)
if configParseErr != nil {
log.Errorf("Error in parsing config file: %s", configParseErr.Error())
os.Exit(1)
}
// Merge in command flag options.
if *ldapAddress != "" {
config.LDAP.Host = *ldapAddress
}
if *ldapInsecure {
config.LDAP.InsecureLDAP = true
}
if *ldapBindDN != "" {
config.LDAP.Bind.DN = *ldapBindDN
}
if *ldapBindPassword != "" {
config.LDAP.Bind.Password = *ldapBindPassword
}
if *statsdHost != "" {
config.Stats = *statsdHost
}
if *iamAccount != "" {
config.AWS.Account = *iamAccount
}
if *listenAddress != "" {
config.Listen = *listenAddress
}
if *defaultRole != "" {
config.AWS.DefaultRole = *defaultRole
}
if *enableLDAPRoles {
config.LDAP.EnableLDAPRoles = true
}
if *roleAttribute != "" {
config.LDAP.RoleAttribute = *roleAttribute
}
if *cacheTimeout != 3600 {
config.CacheTimeout = *cacheTimeout
}
var stats g2s.Statter
var statsErr error
if config.LDAP.UserAttr == "" {
config.LDAP.UserAttr = "cn"
}
if config.Stats == "" {
log.Debug("No statsd server specified; no metrics will be emitted by this program.")
stats = g2s.Noop()
} else {
stats, statsErr = g2s.Dial("udp", config.Stats)
if statsErr != nil {
log.Errorf("Error connecting to statsd: %s. No metrics will be emitted by this program.", statsErr.Error())
stats = g2s.Noop()
} else {
log.Debug("This program will emit metrics to %s", config.Stats)
}
}
// Setup the server state machine that responds to requests.
auth, err := aws.GetAuth(os.Getenv("HOLOGRAM_AWSKEY"), os.Getenv("HOLOGRAM_AWSSECRET"), "", time.Now())
if err != nil {
log.Errorf("Error getting instance credentials: %s", err.Error())
os.Exit(1)
}
stsConnection := sts.New(auth, aws.Regions["us-east-1"])
credentialsService := server.NewDirectSessionTokenService(config.AWS.Account, stsConnection)
var ldapServer *ldap.Conn
// Connect to the LDAP server using TLS or not depending on the config
if config.LDAP.InsecureLDAP {
log.Debug("Connecting to LDAP at server %s (NOT using TLS).", config.LDAP.Host)
ldapServer, err = ldap.Dial("tcp", config.LDAP.Host)
if err != nil {
log.Errorf("Could not dial LDAP! %s", err.Error())
os.Exit(1)
}
} else {
// Connect to the LDAP server with sample credentials.
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
}
log.Debug("Connecting to LDAP at server %s.", config.LDAP.Host)
ldapServer, err = ldap.DialTLS("tcp", config.LDAP.Host, tlsConfig)
if err != nil {
log.Errorf("Could not dial LDAP! %s", err.Error())
os.Exit(1)
}
}
if bindErr := ldapServer.Bind(config.LDAP.Bind.DN, config.LDAP.Bind.Password); bindErr != nil {
log.Errorf("Could not bind to LDAP! %s", bindErr.Error())
os.Exit(1)
}
ldapCache, err := server.NewLDAPUserCache(ldapServer, stats, config.LDAP.UserAttr, config.LDAP.BaseDN, config.LDAP.EnableLDAPRoles, config.LDAP.RoleAttribute)
if err != nil {
log.Errorf("Top-level error in LDAPUserCache layer: %s", err.Error())
os.Exit(1)
}
serverHandler := server.New(ldapCache, credentialsService, config.AWS.DefaultRole, stats, ldapServer, config.LDAP.UserAttr, config.LDAP.BaseDN, config.LDAP.EnableLDAPRoles)
server, err := remote.NewServer(config.Listen, serverHandler.HandleConnection)
// Wait for a signal from the OS to shutdown.
terminate := make(chan os.Signal)
signal.Notify(terminate, syscall.SIGINT, syscall.SIGTERM)
// SIGUSR1 and SIGUSR2 should make Hologram enable and disable debug logging,
// respectively.
debugEnable := make(chan os.Signal)
debugDisable := make(chan os.Signal)
signal.Notify(debugEnable, syscall.SIGUSR1)
signal.Notify(debugDisable, syscall.SIGUSR2)
// SIGHUP should make Hologram server reload its cache of user information
// from LDAP.
reloadCacheSigHup := make(chan os.Signal)
signal.Notify(reloadCacheSigHup, syscall.SIGHUP)
// Reload the cache based on time set in configuration
cacheTimeoutTicker := time.NewTicker(time.Duration(config.CacheTimeout) * time.Second)
log.Info("Hologram server is online, waiting for termination.")
WaitForTermination:
for {
select {
case <-terminate:
break WaitForTermination
case <-debugEnable:
log.Info("Enabling debug mode.")
log.DebugMode(true)
case <-debugDisable:
log.Info("Disabling debug mode.")
log.DebugMode(false)
case <-reloadCacheSigHup:
log.Info("Force-reloading user cache.")
ldapCache.Update()
case <-cacheTimeoutTicker.C:
log.Info("Cache timeout. Reloading user cache.")
ldapCache.Update()
}
}
log.Info("Caught signal; shutting down now.")
server.Close()
}
func (o *opts) doquery(q query) (*ldap.SearchResult, error) {
sr := &ldap.SearchResult{}
// parse the ldap URL
u, err := url.Parse(q.ldapURL)
if err != nil {
return sr, err
}
var port int
if u.Scheme == "ldaps" {
port = 636
} else if u.Scheme == "ldap" {
port = 389
} else {
return sr, fmt.Errorf("Unknown LDAP scheme: %s", u.Scheme)
}
parts := strings.Split(u.Host, ":")
hostname := parts[0]
if len(parts) > 1 {
port, err = strconv.Atoi(parts[1])
if err != nil {
return sr, err
}
}
// connect to the ldap server
var l *ldap.Conn
if u.Scheme == "ldaps" {
tlsConfig := tls.Config{}
if o.goklp_insecure_skip_verify {
tlsConfig.InsecureSkipVerify = true
}
l, err = ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", hostname, port), &tlsConfig)
if err != nil {
return sr, err
}
} else if u.Scheme == "ldap" {
l, err = ldap.Dial("tcp", fmt.Sprintf("%s:%d", hostname, port))
if err != nil {
return sr, err
}
}
defer l.Close()
// do an ldap bind
err = l.Bind(q.user, q.passwd)
if err != nil {
return sr, err
}
// do the ldap search
search := ldap.NewSearchRequest(
q.baseDN,
ldap.ScopeWholeSubtree,
ldap.NeverDerefAliases, 0, 0, false,
q.filter,
q.Attributes,
nil)
sr, err = l.Search(search)
if err != nil {
return sr, err
}
return sr, nil
}