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 import javax.naming.ldap.Rdn;
  16
  17 import org.argeo.util.directory.DirectoryConf;
  18 import org.argeo.util.naming.LdapAttrs;
  19 import org.argeo.util.naming.dns.DnsBrowser;
  20
  21 /** Free IPA specific conventions. */
  22 public class IpaUtils {
  23         public final static String IPA_USER_BASE = "cn=users";
  24         public final static String IPA_GROUP_BASE = "cn=groups";
  25         public final static String IPA_ROLE_BASE = "cn=roles";
  26         public final static String IPA_SERVICE_BASE = "cn=services,cn=accounts";
  27
  28         public final static Rdn IPA_ACCOUNTS_RDN;
  29         static {
  30                 try {
  31                         IPA_ACCOUNTS_RDN = new Rdn(LdapAttrs.cn.name(), "accounts");
  32                 } catch (InvalidNameException e) {
  33                         // should not happen
  34                         throw new IllegalStateException(e);
  35                 }
  36         }
  37
  38         private final static String KRB_PRINCIPAL_NAME = LdapAttrs.krbPrincipalName.name().toLowerCase();
  39
  40         public final static String IPA_USER_DIRECTORY_CONFIG = DirectoryConf.userBase + "=" + IPA_USER_BASE + "&"
  41                         + DirectoryConf.groupBase + "=" + IPA_GROUP_BASE + "&" + DirectoryConf.systemRoleBase + "=" + IPA_ROLE_BASE
  42                         + "&" + DirectoryConf.readOnly + "=true";
  43
  44         @Deprecated
  45         static String domainToUserDirectoryConfigPath(String realm) {
  46                 return domainToBaseDn(realm) + "?" + IPA_USER_DIRECTORY_CONFIG + "&" + DirectoryConf.realm.name() + "=" + realm;
  47         }
  48
  49         public static void addIpaConfig(String realm, Dictionary<String, Object> properties) {
  50                 properties.put(DirectoryConf.baseDn.name(), domainToBaseDn(realm));
  51                 properties.put(DirectoryConf.realm.name(), realm);
  52                 properties.put(DirectoryConf.userBase.name(), IPA_USER_BASE);
  53                 properties.put(DirectoryConf.groupBase.name(), IPA_GROUP_BASE);
  54                 properties.put(DirectoryConf.systemRoleBase.name(), IPA_ROLE_BASE);
  55                 properties.put(DirectoryConf.readOnly.name(), Boolean.TRUE.toString());
  56         }
  57
  58         public static String domainToBaseDn(String domain) {
  59                 String[] dcs = domain.split("\\.");
  60                 StringBuilder sb = new StringBuilder();
  61                 for (int i = 0; i < dcs.length; i++) {
  62                         if (i != 0)
  63                                 sb.append(',');
  64                         String dc = dcs[i];
  65                         sb.append(LdapAttrs.dc.name()).append('=').append(dc.toLowerCase());
  66                 }
  67                 return sb.toString();
  68         }
  69
  70         public static LdapName kerberosToDn(String kerberosName) {
  71                 String[] kname = kerberosName.split("@");
  72                 String username = kname[0];
  73                 String baseDn = domainToBaseDn(kname[1]);
  74                 String dn;
  75                 if (!username.contains("/"))
  76                         dn = LdapAttrs.uid + "=" + username + "," + IPA_USER_BASE + "," + IPA_ACCOUNTS_RDN + "," + baseDn;
  77                 else
  78                         dn = KRB_PRINCIPAL_NAME + "=" + kerberosName + "," + IPA_SERVICE_BASE + "," + baseDn;
  79                 try {
  80                         return new LdapName(dn);
  81                 } catch (InvalidNameException e) {
  82                         throw new IllegalArgumentException("Badly formatted name for " + kerberosName + ": " + dn);
  83                 }
  84         }
  85
  86         private IpaUtils() {
  87
  88         }
  89
  90         public static String kerberosDomainFromDns() {
  91                 String kerberosDomain;
  92                 try (DnsBrowser dnsBrowser = new DnsBrowser()) {
  93                         InetAddress localhost = InetAddress.getLocalHost();
  94                         String hostname = localhost.getHostName();
  95                         String dnsZone = hostname.substring(hostname.indexOf('.') + 1);
  96                         kerberosDomain = dnsBrowser.getRecord("_kerberos." + dnsZone, "TXT");
  97                         return kerberosDomain;
  98                 } catch (NamingException | IOException e) {
  99                         throw new IllegalStateException("Cannot determine Kerberos domain from DNS", e);
 100                 }
 101
 102         }
 103
 104         public static Dictionary<String, Object> convertIpaUri(URI uri) {
 105                 String path = uri.getPath();
 106                 String kerberosRealm;
 107                 if (path == null || path.length() <= 1) {
 108                         kerberosRealm = kerberosDomainFromDns();
 109                 } else {
 110                         kerberosRealm = path.substring(1);
 111                 }
 112
 113                 if (kerberosRealm == null)
 114                         throw new IllegalStateException("No Kerberos domain available for " + uri);
 115                 // TODO intergrate CA certificate in truststore
 116                 // String schemeToUse = SCHEME_LDAPS;
 117                 String schemeToUse = DirectoryConf.SCHEME_LDAP;
 118                 List<String> ldapHosts;
 119                 String ldapHostsStr = uri.getHost();
 120                 if (ldapHostsStr == null || ldapHostsStr.trim().equals("")) {
 121                         try (DnsBrowser dnsBrowser = new DnsBrowser()) {
 122                                 ldapHosts = dnsBrowser.getSrvRecordsAsHosts("_ldap._tcp." + kerberosRealm.toLowerCase(),
 123                                                 schemeToUse.equals(DirectoryConf.SCHEME_LDAP) ? true : false);
 124                                 if (ldapHosts == null || ldapHosts.size() == 0) {
 125                                         throw new IllegalStateException("Cannot configure LDAP for IPA " + uri);
 126                                 } else {
 127                                         ldapHostsStr = ldapHosts.get(0);
 128                                 }
 129                         } catch (NamingException | IOException e) {
 130                                 throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 131                         }
 132                 } else {
 133                         ldapHosts = new ArrayList<>();
 134                         ldapHosts.add(ldapHostsStr);
 135                 }
 136
 137                 StringBuilder uriStr = new StringBuilder();
 138                 try {
 139                         for (String host : ldapHosts) {
 140                                 URI convertedUri = new URI(schemeToUse + "://" + host + "/");
 141                                 uriStr.append(convertedUri).append(' ');
 142                         }
 143                 } catch (URISyntaxException e) {
 144                         throw new IllegalStateException("Cannot convert IPA uri " + uri, e);
 145                 }
 146
 147                 Hashtable<String, Object> res = new Hashtable<>();
 148                 res.put(DirectoryConf.uri.name(), uriStr.toString());
 149                 addIpaConfig(kerberosRealm, res);
 150                 return res;
 151         }
 152 }