614 lines
18 KiB
Go
614 lines
18 KiB
Go
package ldaputil
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import (
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"bytes"
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"crypto/tls"
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"crypto/x509"
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"encoding/binary"
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"fmt"
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"math"
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"net"
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"net/url"
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"strings"
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"text/template"
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"time"
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"github.com/go-ldap/ldap/v3"
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"github.com/hashicorp/errwrap"
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hclog "github.com/hashicorp/go-hclog"
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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/go-secure-stdlib/tlsutil"
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)
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type Client struct {
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Logger hclog.Logger
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LDAP LDAP
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}
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func (c *Client) DialLDAP(cfg *ConfigEntry) (Connection, error) {
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var retErr *multierror.Error
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var conn Connection
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urls := strings.Split(cfg.Url, ",")
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for _, uut := range urls {
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u, err := url.Parse(uut)
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if err != nil {
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retErr = multierror.Append(retErr, errwrap.Wrapf(fmt.Sprintf("error parsing url %q: {{err}}", uut), err))
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continue
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}
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host, port, err := net.SplitHostPort(u.Host)
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if err != nil {
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host = u.Host
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}
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var tlsConfig *tls.Config
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switch u.Scheme {
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case "ldap":
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if port == "" {
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port = "389"
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}
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conn, err = c.LDAP.Dial("tcp", net.JoinHostPort(host, port))
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if err != nil {
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break
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}
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if conn == nil {
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err = fmt.Errorf("empty connection after dialing")
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break
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}
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if cfg.StartTLS {
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tlsConfig, err = getTLSConfig(cfg, host)
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if err != nil {
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break
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}
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err = conn.StartTLS(tlsConfig)
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}
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case "ldaps":
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if port == "" {
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port = "636"
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}
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tlsConfig, err = getTLSConfig(cfg, host)
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if err != nil {
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break
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}
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conn, err = c.LDAP.DialTLS("tcp", net.JoinHostPort(host, port), tlsConfig)
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default:
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retErr = multierror.Append(retErr, fmt.Errorf("invalid LDAP scheme in url %q", net.JoinHostPort(host, port)))
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continue
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}
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if err == nil {
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if retErr != nil {
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if c.Logger.IsDebug() {
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c.Logger.Debug("errors connecting to some hosts", "error", retErr.Error())
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}
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}
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retErr = nil
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break
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}
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retErr = multierror.Append(retErr, errwrap.Wrapf(fmt.Sprintf("error connecting to host %q: {{err}}", uut), err))
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}
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if retErr != nil {
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return nil, retErr
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}
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if timeout := cfg.RequestTimeout; timeout > 0 {
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conn.SetTimeout(time.Duration(timeout) * time.Second)
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}
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return conn, nil
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}
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/*
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* Searches for a username in the ldap server, returning a minimal subset of the
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* user's attributes (if found)
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*/
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func (c *Client) makeLdapSearchRequest(cfg *ConfigEntry, conn Connection, username string) (*ldap.SearchResult, error) {
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// Note: The logic below drives the logic in ConfigEntry.Validate().
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// If updated, please update there as well.
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var err error
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if cfg.BindPassword != "" {
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err = conn.Bind(cfg.BindDN, cfg.BindPassword)
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} else {
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err = conn.UnauthenticatedBind(cfg.BindDN)
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}
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if err != nil {
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return nil, fmt.Errorf("LDAP bind (service) failed: %w", err)
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}
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renderedFilter, err := c.RenderUserSearchFilter(cfg, username)
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if err != nil {
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return nil, err
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}
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if c.Logger.IsDebug() {
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c.Logger.Debug("discovering user", "userdn", cfg.UserDN, "filter", renderedFilter)
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}
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ldapRequest := &ldap.SearchRequest{
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BaseDN: cfg.UserDN,
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Scope: ldap.ScopeWholeSubtree,
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Filter: renderedFilter,
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SizeLimit: 2, // Should be only 1 result. Any number larger (2 or more) means access denied.
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Attributes: []string{
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cfg.UserAttr, // Return only needed attributes
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},
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}
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result, err := conn.Search(ldapRequest)
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if err != nil {
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return nil, err
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}
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return result, nil
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}
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/*
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* Discover and return the bind string for the user attempting to authenticate, as well as the
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* value to use for the identity alias.
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* This is handled in one of several ways:
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*
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* 1. If DiscoverDN is set, the user object will be searched for using userdn (base search path)
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* and userattr (the attribute that maps to the provided username) or user search filter.
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* The bind will either be anonymous or use binddn and bindpassword if they were provided.
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* 2. If upndomain is set, the user dn and alias attribte are constructed as 'username@upndomain'.
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* See https://msdn.microsoft.com/en-us/library/cc223499.aspx
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*
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*/
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func (c *Client) GetUserBindDN(cfg *ConfigEntry, conn Connection, username string) (string, error) {
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bindDN := ""
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// Note: The logic below drives the logic in ConfigEntry.Validate().
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// If updated, please update there as well.
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if cfg.DiscoverDN || (cfg.BindDN != "" && cfg.BindPassword != "") {
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result, err := c.makeLdapSearchRequest(cfg, conn, username)
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if err != nil {
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return bindDN, errwrap.Wrapf("LDAP search for binddn failed: {{err}}", err)
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}
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if len(result.Entries) != 1 {
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return bindDN, fmt.Errorf("LDAP search for binddn 0 or not unique")
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}
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bindDN = result.Entries[0].DN
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} else {
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if cfg.UPNDomain != "" {
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bindDN = fmt.Sprintf("%s@%s", EscapeLDAPValue(username), cfg.UPNDomain)
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} else {
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bindDN = fmt.Sprintf("%s=%s,%s", cfg.UserAttr, EscapeLDAPValue(username), cfg.UserDN)
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}
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}
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return bindDN, nil
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}
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func (c *Client) RenderUserSearchFilter(cfg *ConfigEntry, username string) (string, error) {
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// The UserFilter can be blank if not set, or running this version of the code
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// on an existing ldap configuration
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if cfg.UserFilter == "" {
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cfg.UserFilter = "({{.UserAttr}}={{.Username}})"
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}
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// If userfilter was defined, resolve it as a Go template and use the query to
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// find the login user
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if c.Logger.IsDebug() {
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c.Logger.Debug("compiling search filter", "search_filter", cfg.UserFilter)
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}
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// Parse the configuration as a template.
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// Example template "({{.UserAttr}}={{.Username}})"
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t, err := template.New("queryTemplate").Parse(cfg.UserFilter)
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if err != nil {
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return "", errwrap.Wrapf("LDAP search failed due to template compilation error: {{err}}", err)
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}
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// Build context to pass to template - we will be exposing UserDn and Username.
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context := struct {
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UserAttr string
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Username string
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}{
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ldap.EscapeFilter(cfg.UserAttr),
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ldap.EscapeFilter(username),
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}
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if cfg.UPNDomain != "" {
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context.UserAttr = "userPrincipalName"
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context.Username = fmt.Sprintf("%s@%s", EscapeLDAPValue(username), cfg.UPNDomain)
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}
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var renderedFilter bytes.Buffer
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if err := t.Execute(&renderedFilter, context); err != nil {
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return "", errwrap.Wrapf("LDAP search failed due to template parsing error: {{err}}", err)
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}
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return renderedFilter.String(), nil
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}
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/*
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* Returns the value to be used for the entity alias of this user
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* This is handled in one of several ways:
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*
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* 1. If DiscoverDN is set, the user will be searched for using userdn (base search path)
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* and userattr (the attribute that maps to the provided username) or user search filter.
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* The bind will either be anonymous or use binddn and bindpassword if they were provided.
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* 2. If upndomain is set, the alias attribte is constructed as 'username@upndomain'.
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*
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*/
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func (c *Client) GetUserAliasAttributeValue(cfg *ConfigEntry, conn Connection, username string) (string, error) {
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aliasAttributeValue := ""
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// Note: The logic below drives the logic in ConfigEntry.Validate().
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// If updated, please update there as well.
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if cfg.DiscoverDN || (cfg.BindDN != "" && cfg.BindPassword != "") {
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result, err := c.makeLdapSearchRequest(cfg, conn, username)
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if err != nil {
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return aliasAttributeValue, errwrap.Wrapf("LDAP search for entity alias attribute failed: {{err}}", err)
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}
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if len(result.Entries) != 1 {
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return aliasAttributeValue, fmt.Errorf("LDAP search for entity alias attribute 0 or not unique")
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}
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if len(result.Entries[0].Attributes) != 1 {
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return aliasAttributeValue, fmt.Errorf("LDAP attribute missing for entity alias mapping")
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}
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if len(result.Entries[0].Attributes[0].Values) != 1 {
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return aliasAttributeValue, fmt.Errorf("LDAP entity alias attribute %s empty or not unique for entity alias mapping", cfg.UserAttr)
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}
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aliasAttributeValue = result.Entries[0].Attributes[0].Values[0]
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} else {
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if cfg.UPNDomain != "" {
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aliasAttributeValue = fmt.Sprintf("%s@%s", EscapeLDAPValue(username), cfg.UPNDomain)
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} else {
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aliasAttributeValue = fmt.Sprintf("%s=%s,%s", cfg.UserAttr, EscapeLDAPValue(username), cfg.UserDN)
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}
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}
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return aliasAttributeValue, nil
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}
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/*
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* Returns the DN of the object representing the authenticated user.
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*/
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func (c *Client) GetUserDN(cfg *ConfigEntry, conn Connection, bindDN, username string) (string, error) {
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userDN := ""
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if cfg.UPNDomain != "" {
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// Find the distinguished name for the user if userPrincipalName used for login
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filter := fmt.Sprintf("(userPrincipalName=%s@%s)", EscapeLDAPValue(username), cfg.UPNDomain)
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if c.Logger.IsDebug() {
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c.Logger.Debug("searching upn", "userdn", cfg.UserDN, "filter", filter)
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}
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result, err := conn.Search(&ldap.SearchRequest{
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BaseDN: cfg.UserDN,
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Scope: ldap.ScopeWholeSubtree,
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Filter: filter,
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SizeLimit: math.MaxInt32,
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})
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if err != nil {
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return userDN, errwrap.Wrapf("LDAP search failed for detecting user: {{err}}", err)
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}
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for _, e := range result.Entries {
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userDN = e.DN
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}
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} else {
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userDN = bindDN
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}
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return userDN, nil
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}
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func (c *Client) performLdapFilterGroupsSearch(cfg *ConfigEntry, conn Connection, userDN string, username string) ([]*ldap.Entry, error) {
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if cfg.GroupFilter == "" {
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c.Logger.Warn("groupfilter is empty, will not query server")
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return make([]*ldap.Entry, 0), nil
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}
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if cfg.GroupDN == "" {
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c.Logger.Warn("groupdn is empty, will not query server")
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return make([]*ldap.Entry, 0), nil
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}
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// If groupfilter was defined, resolve it as a Go template and use the query for
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// returning the user's groups
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if c.Logger.IsDebug() {
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c.Logger.Debug("compiling group filter", "group_filter", cfg.GroupFilter)
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}
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// Parse the configuration as a template.
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// Example template "(&(objectClass=group)(member:1.2.840.113556.1.4.1941:={{.UserDN}}))"
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t, err := template.New("queryTemplate").Parse(cfg.GroupFilter)
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if err != nil {
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return nil, errwrap.Wrapf("LDAP search failed due to template compilation error: {{err}}", err)
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}
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// Build context to pass to template - we will be exposing UserDn and Username.
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context := struct {
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UserDN string
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Username string
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}{
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ldap.EscapeFilter(userDN),
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ldap.EscapeFilter(username),
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}
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var renderedQuery bytes.Buffer
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if err := t.Execute(&renderedQuery, context); err != nil {
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return nil, errwrap.Wrapf("LDAP search failed due to template parsing error: {{err}}", err)
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}
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if c.Logger.IsDebug() {
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c.Logger.Debug("searching", "groupdn", cfg.GroupDN, "rendered_query", renderedQuery.String())
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}
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result, err := conn.Search(&ldap.SearchRequest{
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BaseDN: cfg.GroupDN,
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Scope: ldap.ScopeWholeSubtree,
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Filter: renderedQuery.String(),
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Attributes: []string{
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cfg.GroupAttr,
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},
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SizeLimit: math.MaxInt32,
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})
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if err != nil {
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return nil, errwrap.Wrapf("LDAP search failed: {{err}}", err)
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}
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return result.Entries, nil
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}
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func sidBytesToString(b []byte) (string, error) {
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reader := bytes.NewReader(b)
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var revision, subAuthorityCount uint8
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var identifierAuthorityParts [3]uint16
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if err := binary.Read(reader, binary.LittleEndian, &revision); err != nil {
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return "", errwrap.Wrapf(fmt.Sprintf("SID %#v convert failed reading Revision: {{err}}", b), err)
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}
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if err := binary.Read(reader, binary.LittleEndian, &subAuthorityCount); err != nil {
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return "", errwrap.Wrapf(fmt.Sprintf("SID %#v convert failed reading SubAuthorityCount: {{err}}", b), err)
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}
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if err := binary.Read(reader, binary.BigEndian, &identifierAuthorityParts); err != nil {
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return "", errwrap.Wrapf(fmt.Sprintf("SID %#v convert failed reading IdentifierAuthority: {{err}}", b), err)
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}
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identifierAuthority := (uint64(identifierAuthorityParts[0]) << 32) + (uint64(identifierAuthorityParts[1]) << 16) + uint64(identifierAuthorityParts[2])
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subAuthority := make([]uint32, subAuthorityCount)
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if err := binary.Read(reader, binary.LittleEndian, &subAuthority); err != nil {
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return "", errwrap.Wrapf(fmt.Sprintf("SID %#v convert failed reading SubAuthority: {{err}}", b), err)
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}
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result := fmt.Sprintf("S-%d-%d", revision, identifierAuthority)
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for _, subAuthorityPart := range subAuthority {
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result += fmt.Sprintf("-%d", subAuthorityPart)
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}
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return result, nil
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}
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func (c *Client) performLdapTokenGroupsSearch(cfg *ConfigEntry, conn Connection, userDN string) ([]*ldap.Entry, error) {
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result, err := conn.Search(&ldap.SearchRequest{
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BaseDN: userDN,
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Scope: ldap.ScopeBaseObject,
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Filter: "(objectClass=*)",
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Attributes: []string{
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"tokenGroups",
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},
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SizeLimit: 1,
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})
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if err != nil {
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return nil, errwrap.Wrapf("LDAP search failed: {{err}}", err)
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}
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if len(result.Entries) == 0 {
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c.Logger.Warn("unable to read object for group attributes", "userdn", userDN, "groupattr", cfg.GroupAttr)
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return make([]*ldap.Entry, 0), nil
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}
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userEntry := result.Entries[0]
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groupAttrValues := userEntry.GetRawAttributeValues("tokenGroups")
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groupEntries := make([]*ldap.Entry, 0, len(groupAttrValues))
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for _, sidBytes := range groupAttrValues {
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sidString, err := sidBytesToString(sidBytes)
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if err != nil {
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c.Logger.Warn("unable to read sid", "err", err)
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continue
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}
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groupResult, err := conn.Search(&ldap.SearchRequest{
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BaseDN: fmt.Sprintf("<SID=%s>", sidString),
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Scope: ldap.ScopeBaseObject,
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Filter: "(objectClass=*)",
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Attributes: []string{
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"1.1", // RFC no attributes
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},
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SizeLimit: 1,
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})
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if err != nil {
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c.Logger.Warn("unable to read the group sid", "sid", sidString)
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continue
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}
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if len(groupResult.Entries) == 0 {
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c.Logger.Warn("unable to find the group", "sid", sidString)
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continue
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}
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groupEntries = append(groupEntries, groupResult.Entries[0])
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}
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return groupEntries, nil
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}
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/*
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* getLdapGroups queries LDAP and returns a slice describing the set of groups the authenticated user is a member of.
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*
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* If cfg.UseTokenGroups is true then the search is performed directly on the userDN.
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* The values of those attributes are converted to string SIDs, and then looked up to get ldap.Entry objects.
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* Otherwise, the search query is constructed according to cfg.GroupFilter, and run in context of cfg.GroupDN.
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* Groups will be resolved from the query results by following the attribute defined in cfg.GroupAttr.
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*
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* cfg.GroupFilter is a go template and is compiled with the following context: [UserDN, Username]
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* UserDN - The DN of the authenticated user
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* Username - The Username of the authenticated user
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*
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* Example:
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* cfg.GroupFilter = "(&(objectClass=group)(member:1.2.840.113556.1.4.1941:={{.UserDN}}))"
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* cfg.GroupDN = "OU=Groups,DC=myorg,DC=com"
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* cfg.GroupAttr = "cn"
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*
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* NOTE - If cfg.GroupFilter is empty, no query is performed and an empty result slice is returned.
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*
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*/
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func (c *Client) GetLdapGroups(cfg *ConfigEntry, conn Connection, userDN string, username string) ([]string, error) {
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var entries []*ldap.Entry
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var err error
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if cfg.UseTokenGroups {
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entries, err = c.performLdapTokenGroupsSearch(cfg, conn, userDN)
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} else {
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entries, err = c.performLdapFilterGroupsSearch(cfg, conn, userDN, username)
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}
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if err != nil {
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return nil, err
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}
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// retrieve the groups in a string/bool map as a structure to avoid duplicates inside
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ldapMap := make(map[string]bool)
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for _, e := range entries {
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dn, err := ldap.ParseDN(e.DN)
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if err != nil || len(dn.RDNs) == 0 {
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continue
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}
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// Enumerate attributes of each result, parse out CN and add as group
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values := e.GetAttributeValues(cfg.GroupAttr)
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if len(values) > 0 {
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for _, val := range values {
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groupCN := getCN(cfg, val)
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ldapMap[groupCN] = true
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}
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} else {
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// If groupattr didn't resolve, use self (enumerating group objects)
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groupCN := getCN(cfg, e.DN)
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ldapMap[groupCN] = true
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}
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}
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ldapGroups := make([]string, 0, len(ldapMap))
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for key := range ldapMap {
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ldapGroups = append(ldapGroups, key)
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}
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|
|
return ldapGroups, nil
|
|
}
|
|
|
|
// EscapeLDAPValue is exported because a plugin uses it outside this package.
|
|
func EscapeLDAPValue(input string) string {
|
|
if input == "" {
|
|
return ""
|
|
}
|
|
|
|
// RFC4514 forbids un-escaped:
|
|
// - leading space or hash
|
|
// - trailing space
|
|
// - special characters '"', '+', ',', ';', '<', '>', '\\'
|
|
// - null
|
|
for i := 0; i < len(input); i++ {
|
|
escaped := false
|
|
if input[i] == '\\' && i+1 < len(input)-1 {
|
|
i++
|
|
escaped = true
|
|
}
|
|
switch input[i] {
|
|
case '"', '+', ',', ';', '<', '>', '\\':
|
|
if !escaped {
|
|
input = input[0:i] + "\\" + input[i:]
|
|
i++
|
|
}
|
|
continue
|
|
}
|
|
if escaped {
|
|
input = input[0:i] + "\\" + input[i:]
|
|
i++
|
|
}
|
|
}
|
|
if input[0] == ' ' || input[0] == '#' {
|
|
input = "\\" + input
|
|
}
|
|
if input[len(input)-1] == ' ' {
|
|
input = input[0:len(input)-1] + "\\ "
|
|
}
|
|
return input
|
|
}
|
|
|
|
/*
|
|
* Parses a distinguished name and returns the CN portion.
|
|
* Given a non-conforming string (such as an already-extracted CN),
|
|
* it will be returned as-is.
|
|
*/
|
|
func getCN(cfg *ConfigEntry, dn string) string {
|
|
parsedDN, err := ldap.ParseDN(dn)
|
|
if err != nil || len(parsedDN.RDNs) == 0 {
|
|
// It was already a CN, return as-is
|
|
return dn
|
|
}
|
|
|
|
for _, rdn := range parsedDN.RDNs {
|
|
for _, rdnAttr := range rdn.Attributes {
|
|
if cfg.UsePre111GroupCNBehavior == nil || *cfg.UsePre111GroupCNBehavior {
|
|
if rdnAttr.Type == "CN" {
|
|
return rdnAttr.Value
|
|
}
|
|
} else {
|
|
if strings.EqualFold(rdnAttr.Type, "CN") {
|
|
return rdnAttr.Value
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Default, return self
|
|
return dn
|
|
}
|
|
|
|
func getTLSConfig(cfg *ConfigEntry, host string) (*tls.Config, error) {
|
|
tlsConfig := &tls.Config{
|
|
ServerName: host,
|
|
}
|
|
|
|
if cfg.TLSMinVersion != "" {
|
|
tlsMinVersion, ok := tlsutil.TLSLookup[cfg.TLSMinVersion]
|
|
if !ok {
|
|
return nil, fmt.Errorf("invalid 'tls_min_version' in config")
|
|
}
|
|
tlsConfig.MinVersion = tlsMinVersion
|
|
}
|
|
|
|
if cfg.TLSMaxVersion != "" {
|
|
tlsMaxVersion, ok := tlsutil.TLSLookup[cfg.TLSMaxVersion]
|
|
if !ok {
|
|
return nil, fmt.Errorf("invalid 'tls_max_version' in config")
|
|
}
|
|
tlsConfig.MaxVersion = tlsMaxVersion
|
|
}
|
|
|
|
if cfg.InsecureTLS {
|
|
tlsConfig.InsecureSkipVerify = true
|
|
}
|
|
if cfg.Certificate != "" {
|
|
caPool := x509.NewCertPool()
|
|
ok := caPool.AppendCertsFromPEM([]byte(cfg.Certificate))
|
|
if !ok {
|
|
return nil, fmt.Errorf("could not append CA certificate")
|
|
}
|
|
tlsConfig.RootCAs = caPool
|
|
}
|
|
if cfg.ClientTLSCert != "" && cfg.ClientTLSKey != "" {
|
|
certificate, err := tls.X509KeyPair([]byte(cfg.ClientTLSCert), []byte(cfg.ClientTLSKey))
|
|
if err != nil {
|
|
return nil, errwrap.Wrapf("failed to parse client X509 key pair: {{err}}", err)
|
|
}
|
|
tlsConfig.Certificates = append(tlsConfig.Certificates, certificate)
|
|
} else if cfg.ClientTLSCert != "" || cfg.ClientTLSKey != "" {
|
|
return nil, fmt.Errorf("both client_tls_cert and client_tls_key must be set")
|
|
}
|
|
return tlsConfig, nil
|
|
}
|