Add support for retrieving user certificates

It's possible to add a public S/MIME certificate for a user to the GAL. These
are used when a user wants to encrypt a mail to another user, or validate their
signature. The public certificate of the recipient is required. Being able to
look them up rather than engage in a manual or offline synchornisation process
makes this easier, as well as fetching updated certificates when they're
changed.

The bulk of this work was done by @krutelp in
#98 I merely extended it to support the
UserSMIMECertificate field in addition to the MSExchangeCertificate field.

These are both part of the EWS Contact:
https://learn.microsoft.com/en-us/dotnet/api/microsoft.exchange.webservices.data.contact?view=exchange-ews-api

I tried to do it without using ContactDataShape.AllProperties but like @krutelp
couldn't find a method that would return the certificates.

I extended the ignored tags based on what was returned by our Microsoft365
instance, but not all of the fields listed under the Contact type above.

I slightly modified the original PR to use Dos line endings in
ResolveNamesMethod.java so exact changes could be observed instead of the
entire file being changed.

I also added the keys to the contact in ExchangeSession.java as KEY1 and KEY2.

Finally, I undid the small changes in LdapConnection.java to the isMatch()
methods to have them take an ExchangeSession.Contact and put them back to
Map<String, String>. This was mostly done to limit the changes in the patch to
those necessary.

src/java/davmail/exchange/ExchangeSession.java

@@ -2020,6 +2020,9 @@ public String getBody() {
                 writer.writeLine("PHOTO;TYPE=" + contactPhoto.contentType + ";ENCODING=BASE64:");
                 writer.writeLine(contactPhoto.content, true);
             }
+
+            writer.appendProperty("KEY1;X509;ENCODING=BASE64", get("msexchangecertificate"));
+            writer.appendProperty("KEY2;X509;ENCODING=BASE64", get("usersmimecertificate"));
 
             writer.endCard();
             return writer.toString();
@@ -2798,6 +2801,10 @@ protected ItemResult createOrUpdateContact(String folderPath, String itemName, S
                 } else if ("PHOTO".equals(property.getKey())) {
                     properties.put("photo", property.getValue());
                     properties.put("haspicture", "true");
+                } else if ("KEY1".equals(property.getKey())) {
+                    properties.put("msexchangecertificate", property.getValue());
+                } else if ("KEY2".equals(property.getKey())) {
+                    properties.put("usersmimecertificate", property.getValue());
                 }
             }
             LOGGER.debug("Create or update contact " + itemName + ": " + properties);
@@ -3012,6 +3019,8 @@ public String getAlias() {
         CONTACT_ATTRIBUTES.add("private");
         CONTACT_ATTRIBUTES.add("sensitivity");
         CONTACT_ATTRIBUTES.add("fburl");
+        CONTACT_ATTRIBUTES.add("msexchangecertificate");
+        CONTACT_ATTRIBUTES.add("usersmimecertificate");
     }
 
     protected static final Set<String> DISTRIBUTION_LIST_ATTRIBUTES = new HashSet<>();

src/java/davmail/exchange/ews/EwsExchangeSession.java

@@ -2975,6 +2975,8 @@ protected void internalExecuteMethod(EWSMethod ewsMethod) throws IOException {
 
         GALFIND_ATTRIBUTE_MAP.put("homePhone", "HomePhone");
         GALFIND_ATTRIBUTE_MAP.put("pager", "Pager");
+        GALFIND_ATTRIBUTE_MAP.put("msexchangecertificate", "MSExchangeCertificate");
+        GALFIND_ATTRIBUTE_MAP.put("usersmimecertificate", "UserSMIMECertificate");
     }
 
     protected static final HashSet<String> IGNORE_ATTRIBUTE_SET = new HashSet<>();

src/java/davmail/exchange/ews/Field.java

@@ -272,6 +272,9 @@ private Field() {
         // attachments
         FIELD_MAP.put("attachments", new UnindexedFieldURI("item:Attachments"));
 
+        // user certificate
+        FIELD_MAP.put("msexchangecertificate", new UnindexedFieldURI("contacts:MSExchangeCertificate"));
+        FIELD_MAP.put("usersmimecertificate", new UnindexedFieldURI("contacts:UserSMIMECertificate"));
     }
 
     /**

src/java/davmail/exchange/ews/ResolveNamesMethod.java

@@ -38,6 +38,7 @@ public ResolveNamesMethod(String value) {
         super("Contact", "ResolveNames", "ResolutionSet");
         addMethodOption(SearchScope.ActiveDirectory);
         addMethodOption(RETURN_FULL_CONTACT_DATA);
+        addMethodOption(ContactDataShape.AllProperties);
         unresolvedEntry = new ElementOption("m:UnresolvedEntry", value);
     }
 
@@ -88,6 +89,27 @@ protected void handleContact(XMLStreamReader reader, Item responseItem) throws X
                     handlePhysicalAddresses(reader, responseItem);
                 } else if ("PhoneNumbers".equals(tagLocalName)) {
                     handlePhoneNumbers(reader, responseItem);
+                } else if ("MSExchangeCertificate".equals(tagLocalName)
+                        || "UserSMIMECertificate".equals(tagLocalName)) {
+                    handleUserCertificate(reader, responseItem, tagLocalName);
+                } else if ("ManagerMailbox".equals(tagLocalName)
+                        || "Attachments".equals(tagLocalName)
+                        || "Photo".equals(tagLocalName)
+                        || "Notes".equals(tagLocalName)
+                        || "HasPicture".equals(tagLocalName)
+                        || "DirectoryId".equals(tagLocalName)
+                        || "Alias".equals(tagLocalName)
+                        || "Categories".equals(tagLocalName)
+                        || "InternetMessageHeaders".equals(tagLocalName)
+                        || "ResponseObjects".equals(tagLocalName)
+                        || "ExtendedProperty".equals(tagLocalName)
+                        || "EffectiveRights".equals(tagLocalName)
+                        || "CompleteName".equals(tagLocalName)
+                        || "Children".equals(tagLocalName)
+                        || "Companies".equals(tagLocalName)
+                        || "ImAddresses".equals(tagLocalName)
+                        || "DirectReports".equals(tagLocalName)) {
+                    skipTag(reader, tagLocalName);
                 } else {
                     responseItem.put(tagLocalName, XMLStreamUtil.getElementText(reader));
                 }
@@ -133,6 +155,37 @@ protected void handlePhoneNumbers(XMLStreamReader reader, Item responseItem) thr
         }
     }
 
+    protected void handleUserCertificate(XMLStreamReader reader, Item responseItem, String contextTagLocalName) throws XMLStreamException {
+        boolean firstValueRead = false;
+        String certificate = "";
+        while (reader.hasNext() && !XMLStreamUtil.isEndTag(reader, contextTagLocalName)) {
+            reader.next();
+            if (XMLStreamUtil.isStartTag(reader)) {
+                String tagLocalName = reader.getLocalName();
+                if ("Base64Binary".equals(tagLocalName)) {
+                    String value = reader.getElementText();
+                    if ((value != null) && !value.isEmpty()) {
+                        if (!firstValueRead) {
+                            // Only first certificate value will be read
+                            certificate = value;
+                        } else {
+                            LOGGER.debug("ResolveNames multiple certificates found, tagLocaleName="
+                                    + contextTagLocalName + " Certificate [" + value + "] ignored");
+                        }
+                    }
+                }
+            }
+        }
+        responseItem.put(contextTagLocalName, certificate);
+    }
+
+    protected void skipTag(XMLStreamReader reader, String tagLocalName) throws XMLStreamException {
+        LOGGER.debug("ResolveNames tag parsing skipped. tagLocalName=" + tagLocalName);
+        while (reader.hasNext() && !XMLStreamUtil.isEndTag(reader, tagLocalName)) {
+            reader.next();
+        }
+    }
+
     @Override
     protected void handleEmailAddresses(XMLStreamReader reader, Item responseItem) throws XMLStreamException {
         while (reader.hasNext() && !XMLStreamUtil.isEndTag(reader, "EmailAddresses")) {

src/java/davmail/ldap/LdapConnection.java

@@ -26,6 +26,7 @@
 import davmail.exchange.ExchangeSessionFactory;
 import davmail.exchange.dav.DavExchangeSession;
 import davmail.ui.tray.DavGatewayTray;
+import davmail.util.IOUtil;
 import org.apache.log4j.Logger;
 
 import javax.naming.InvalidNameException;
@@ -122,6 +123,8 @@ public class LdapConnection extends AbstractConnection {
         CONTACT_TO_LDAP_ATTRIBUTE_MAP.put("homeStreet", "mozillahomestreet");
         CONTACT_TO_LDAP_ATTRIBUTE_MAP.put("businesshomepage", "mozillaworkurl");
         CONTACT_TO_LDAP_ATTRIBUTE_MAP.put("nickname", "mozillanickname");
+        CONTACT_TO_LDAP_ATTRIBUTE_MAP.put("msexchangecertificate", "msexchangecertificate;binary");
+        CONTACT_TO_LDAP_ATTRIBUTE_MAP.put("usersmimecertificate", "usersmimecertificate;binary");
     }
 
     /**
@@ -287,6 +290,10 @@ public class LdapConnection extends AbstractConnection {
 
         // iCal search attribute
         LDAP_TO_CONTACT_ATTRIBUTE_MAP.put("apple-serviceslocator", "apple-serviceslocator");
+
+        LDAP_TO_CONTACT_ATTRIBUTE_MAP.put("msexchangecertificate;binary", "msexchangecertificate");
+        LDAP_TO_CONTACT_ATTRIBUTE_MAP.put("usersmimecertificate;binary", "usersmimecertificate");
+
     }
 
     /**
@@ -967,6 +974,8 @@ protected void sendEntry(int currentMessageId, String dn, Map<String, Object> at
                     for (Object value : (Iterable) values) {
                         responseBer.encodeString((String) value, isLdapV3());
                     }
+                } else if (values instanceof byte[]) {
+                	responseBer.encodeOctetString((byte[])values, BerEncoder.ASN_OCTET_STR);
                 } else {
                     throw new DavMailException("EXCEPTION_UNSUPPORTED_VALUE", values);
                 }
@@ -1688,6 +1697,14 @@ protected void sendPersons(int currentMessageId, String baseContext, Map<String,
                         ldapPerson.put("apple-generateduid", ldapPerson.get("uid"));
                     }
                 }
+                if (ldapPerson.containsKey("msexchangecertificate;binary")) {
+                	String certificate = (String) ldapPerson.get("msexchangecertificate;binary");
+                	ldapPerson.put("msexchangecertificate;binary", IOUtil.decodeBase64(certificate));
+                }
+                if (ldapPerson.containsKey("usersmimecertificate;binary")) {
+                	String certificate = (String) ldapPerson.get("usersmimecertificate;binary");
+                	ldapPerson.put("usersmimecertificate;binary", IOUtil.decodeBase64(certificate));
+                }
 
                 // iCal: replace current user alias with login name
                 if (session.getAlias().equals(ldapPerson.get("uid"))) {