IpaUtils.java

   1 package org.argeo.osgi.useradmin;
   2
   3 import java.io.IOException;
   4 import java.net.InetAddress;
   5 import java.net.URI;
   6 import java.net.URISyntaxException;
   7 import java.util.ArrayList;
   8 import java.util.Dictionary;
   9 import java.util.Hashtable;
  10 import java.util.List;
  11
  12 import javax.naming.InvalidNameException;
  13 import javax.naming.NamingException;
  14 import javax.naming.ldap.LdapName;
  15
  16 import org.argeo.util.naming.LdapAttrs;
  17 import org.argeo.util.naming.dns.DnsBrowser;
  18
  19 /** Free IPA specific conventions. */
  20 public class IpaUtils {
  21         public final static String IPA_USER_BASE = "cn=users,cn=accounts";
  22         public final static String IPA_GROUP_BASE = "cn=groups,cn=accounts";
  23         public final static String IPA_ROLE_BASE = "cn=roles,cn=accounts";
  24         public final static String IPA_SERVICE_BASE = "cn=services,cn=accounts";
  25
  26         private final static String KRB_PRINCIPAL_NAME = LdapAttrs.krbPrincipalName.name().toLowerCase();
  27
  28         public final static String IPA_USER_DIRECTORY_CONFIG = UserAdminConf.userBase + "=" + IPA_USER_BASE + "&"
  29                         + UserAdminConf.groupBase + "=" + IPA_GROUP_BASE + "&" + UserAdminConf.readOnly + "=true";
  30
  31         @Deprecated
  32         static String domainToUserDirectoryConfigPath(String realm) {
  33                 return domainToBaseDn(realm) + "?" + IPA_USER_DIRECTORY_CONFIG + "&" + UserAdminConf.realm.name() + "=" + realm;
  34         }
  35
  36         public static void addIpaConfig(String realm, Dictionary<String, Object> properties) {
  37                 properties.put(UserAdminConf.baseDn.name(), domainToBaseDn(realm));
  38                 properties.put(UserAdminConf.realm.name(), realm);
  39                 properties.put(UserAdminConf.userBase.name(), IPA_USER_BASE);
  40                 properties.put(UserAdminConf.groupBase.name(), IPA_GROUP_BASE);
  41                 properties.put(UserAdminConf.systemRoleBase.name(), IPA_ROLE_BASE);
  42                 properties.put(UserAdminConf.readOnly.name(), Boolean.TRUE.toString());
  43         }
  44
  45         public static String domainToBaseDn(String domain) {
  46                 String[] dcs = domain.split("\\.");
  47                 StringBuilder sb = new StringBuilder();
  48                 for (int i = 0; i < dcs.length; i++) {
  49                         if (i != 0)
  50                                 sb.append(',');
  51                         String dc = dcs[i];
  52                         sb.append(LdapAttrs.dc.name()).append('=').append(dc.toLowerCase());
  53                 }
  54                 return sb.toString();
  55         }
  56
  57         public static LdapName kerberosToDn(String kerberosName) {
  58                 String[] kname = kerberosName.split("@");
  59                 String username = kname[0];
  60                 String baseDn = domainToBaseDn(kname[1]);
  61                 String dn;
  62                 if (!username.contains("/"))
  63                         dn = LdapAttrs.uid + "=" + username + "," + IPA_USER_BASE + "," + baseDn;
  64                 else
  65                         dn = KRB_PRINCIPAL_NAME + "=" + kerberosName + "," + IPA_SERVICE_BASE + "," + baseDn;
  66                 try {
  67                         return new LdapName(dn);
  68                 } catch (InvalidNameException e) {
  69                         throw new IllegalArgumentException("Badly formatted name for " + kerberosName + ": " + dn);
  70                 }
  71         }
  72
  73         private IpaUtils() {
  74
  75         }
  76
  77         public static String kerberosDomainFromDns() {
  78                 String kerberosDomain;
  79                 try (DnsBrowser dnsBrowser = new DnsBrowser()) {
  80                         InetAddress localhost = InetAddress.getLocalHost();
  81                         String hostname = localhost.getHostName();
  82                         String dnsZone = hostname.substring(hostname.indexOf('.') + 1);
  83                         kerberosDomain = dnsBrowser.getRecord("_kerberos." + dnsZone, "TXT");
  84                         return kerberosDomain;
  85                 } catch (NamingException | IOException e) {
  86                         throw new IllegalStateException("Cannot determine Kerberos domain from DNS", e);
  87                 }
  88
  89         }
  90
  91         public static Dictionary<String, Object> convertIpaUri(URI uri) {
  92                 String path = uri.getPath();
  93                 String kerberosRealm;
  94                 if (path == null || path.length() <= 1) {
  95                         kerberosRealm = kerberosDomainFromDns();
  96                 } else {
  97                         kerberosRealm = path.substring(1);
  98                 }
  99
 100                 if (kerberosRealm == null)
 101                         throw new IllegalStateException("No Kerberos domain available for " + uri);
 102                 // TODO intergrate CA certificate in truststore
 103                 // String schemeToUse = SCHEME_LDAPS;
 104                 String schemeToUse = UserAdminConf.SCHEME_LDAP;
 105                 List<String> ldapHosts;
 106                 String ldapHostsStr = uri.getHost();
 107                 if (ldapHostsStr == null || ldapHostsStr.trim().equals("")) {
 108                         try (DnsBrowser dnsBrowser = new DnsBrowser()) {
 109                                 ldapHosts = dnsBrowser.getSrvRecordsAsHosts("_ldap._tcp." + kerberosRealm.toLowerCase(),
 110                                                 schemeToUse.equals(UserAdminConf.SCHEME_LDAP) ? true : false);
 111                                 if (ldapHosts == null || ldapHosts.size() == 0) {
 112                                         throw new IllegalStateException("Cannot configure LDAP for IPA " + uri);
 113                                 } else {
 114                                         ldapHostsStr = ldapHosts.get(0);
 115                                 }
 116                         } catch (NamingException | IOException e) {
 117                                 throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 118                         }
 119                 } else {
 120                         ldapHosts = new ArrayList<>();
 121                         ldapHosts.add(ldapHostsStr);
 122                 }
 123
 124                 StringBuilder uriStr = new StringBuilder();
 125                 try {
 126                         for (String host : ldapHosts) {
 127                                 URI convertedUri = new URI(schemeToUse + "://" + host + "/");
 128                                 uriStr.append(convertedUri).append(' ');
 129                         }
 130                 } catch (URISyntaxException e) {
 131                         throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 132                 }
 133
 134                 Hashtable<String, Object> res = new Hashtable<>();
 135                 res.put(UserAdminConf.uri.name(), uriStr.toString());
 136                 addIpaConfig(kerberosRealm, res);
 137                 return res;
 138         }
 139 }