org.argeo.util/src/org/argeo/util/directory/ldap/IpaUtils.java

   1 package org.argeo.util.directory.ldap;
   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.directory.DirectoryConf;
  17 import org.argeo.util.naming.LdapAttrs;
  18 import org.argeo.util.naming.dns.DnsBrowser;
  19
  20 /** Free IPA specific conventions. */
  21 public class IpaUtils {
  22         public final static String IPA_USER_BASE = "cn=users,cn=accounts";
  23         public final static String IPA_GROUP_BASE = "cn=groups,cn=accounts";
  24         public final static String IPA_ROLE_BASE = "cn=roles,cn=accounts";
  25         public final static String IPA_SERVICE_BASE = "cn=services,cn=accounts";
  26
  27         private final static String KRB_PRINCIPAL_NAME = LdapAttrs.krbPrincipalName.name().toLowerCase();
  28
  29         public final static String IPA_USER_DIRECTORY_CONFIG = DirectoryConf.userBase + "=" + IPA_USER_BASE + "&"
  30                         + DirectoryConf.groupBase + "=" + IPA_GROUP_BASE + "&" + DirectoryConf.readOnly + "=true";
  31
  32         @Deprecated
  33         static String domainToUserDirectoryConfigPath(String realm) {
  34                 return domainToBaseDn(realm) + "?" + IPA_USER_DIRECTORY_CONFIG + "&" + DirectoryConf.realm.name() + "=" + realm;
  35         }
  36
  37         public static void addIpaConfig(String realm, Dictionary<String, Object> properties) {
  38                 properties.put(DirectoryConf.baseDn.name(), domainToBaseDn(realm));
  39                 properties.put(DirectoryConf.realm.name(), realm);
  40                 properties.put(DirectoryConf.userBase.name(), IPA_USER_BASE);
  41                 properties.put(DirectoryConf.groupBase.name(), IPA_GROUP_BASE);
  42                 properties.put(DirectoryConf.systemRoleBase.name(), IPA_ROLE_BASE);
  43                 properties.put(DirectoryConf.readOnly.name(), Boolean.TRUE.toString());
  44         }
  45
  46         public static String domainToBaseDn(String domain) {
  47                 String[] dcs = domain.split("\\.");
  48                 StringBuilder sb = new StringBuilder();
  49                 for (int i = 0; i < dcs.length; i++) {
  50                         if (i != 0)
  51                                 sb.append(',');
  52                         String dc = dcs[i];
  53                         sb.append(LdapAttrs.dc.name()).append('=').append(dc.toLowerCase());
  54                 }
  55                 return sb.toString();
  56         }
  57
  58         public static LdapName kerberosToDn(String kerberosName) {
  59                 String[] kname = kerberosName.split("@");
  60                 String username = kname[0];
  61                 String baseDn = domainToBaseDn(kname[1]);
  62                 String dn;
  63                 if (!username.contains("/"))
  64                         dn = LdapAttrs.uid + "=" + username + "," + IPA_USER_BASE + "," + baseDn;
  65                 else
  66                         dn = KRB_PRINCIPAL_NAME + "=" + kerberosName + "," + IPA_SERVICE_BASE + "," + baseDn;
  67                 try {
  68                         return new LdapName(dn);
  69                 } catch (InvalidNameException e) {
  70                         throw new IllegalArgumentException("Badly formatted name for " + kerberosName + ": " + dn);
  71                 }
  72         }
  73
  74         private IpaUtils() {
  75
  76         }
  77
  78         public static String kerberosDomainFromDns() {
  79                 String kerberosDomain;
  80                 try (DnsBrowser dnsBrowser = new DnsBrowser()) {
  81                         InetAddress localhost = InetAddress.getLocalHost();
  82                         String hostname = localhost.getHostName();
  83                         String dnsZone = hostname.substring(hostname.indexOf('.') + 1);
  84                         kerberosDomain = dnsBrowser.getRecord("_kerberos." + dnsZone, "TXT");
  85                         return kerberosDomain;
  86                 } catch (NamingException | IOException e) {
  87                         throw new IllegalStateException("Cannot determine Kerberos domain from DNS", e);
  88                 }
  89
  90         }
  91
  92         public static Dictionary<String, Object> convertIpaUri(URI uri) {
  93                 String path = uri.getPath();
  94                 String kerberosRealm;
  95                 if (path == null || path.length() <= 1) {
  96                         kerberosRealm = kerberosDomainFromDns();
  97                 } else {
  98                         kerberosRealm = path.substring(1);
  99                 }
 100
 101                 if (kerberosRealm == null)
 102                         throw new IllegalStateException("No Kerberos domain available for " + uri);
 103                 // TODO intergrate CA certificate in truststore
 104                 // String schemeToUse = SCHEME_LDAPS;
 105                 String schemeToUse = DirectoryConf.SCHEME_LDAP;
 106                 List<String> ldapHosts;
 107                 String ldapHostsStr = uri.getHost();
 108                 if (ldapHostsStr == null || ldapHostsStr.trim().equals("")) {
 109                         try (DnsBrowser dnsBrowser = new DnsBrowser()) {
 110                                 ldapHosts = dnsBrowser.getSrvRecordsAsHosts("_ldap._tcp." + kerberosRealm.toLowerCase(),
 111                                                 schemeToUse.equals(DirectoryConf.SCHEME_LDAP) ? true : false);
 112                                 if (ldapHosts == null || ldapHosts.size() == 0) {
 113                                         throw new IllegalStateException("Cannot configure LDAP for IPA " + uri);
 114                                 } else {
 115                                         ldapHostsStr = ldapHosts.get(0);
 116                                 }
 117                         } catch (NamingException | IOException e) {
 118                                 throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 119                         }
 120                 } else {
 121                         ldapHosts = new ArrayList<>();
 122                         ldapHosts.add(ldapHostsStr);
 123                 }
 124
 125                 StringBuilder uriStr = new StringBuilder();
 126                 try {
 127                         for (String host : ldapHosts) {
 128                                 URI convertedUri = new URI(schemeToUse + "://" + host + "/");
 129                                 uriStr.append(convertedUri).append(' ');
 130                         }
 131                 } catch (URISyntaxException e) {
 132                         throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 133                 }
 134
 135                 Hashtable<String, Object> res = new Hashtable<>();
 136                 res.put(DirectoryConf.uri.name(), uriStr.toString());
 137                 addIpaConfig(kerberosRealm, res);
 138                 return res;
 139         }
 140 }