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