Feature: Active Directory MSI Authentication support

src/main/java/com/microsoft/sqlserver/jdbc/AuthenticationJNI.java

@@ -59,7 +59,6 @@ static boolean isDllLoaded() {
             enabled = true;
         } catch (UnsatisfiedLinkError e) {
             temp = e;
-            authLogger.warning("Failed to load the sqljdbc_auth.dll cause : " + e.getMessage());
             // This is not re-thrown on purpose - the constructor will terminate the properly with the appropriate error
             // string
         } finally {

src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java

@@ -103,6 +103,7 @@ final class TDS {
     static final int TDS_FEDAUTH_LIBRARY_RESERVED = 0x7F;
     static final byte ADALWORKFLOW_ACTIVEDIRECTORYPASSWORD = 0x01;
     static final byte ADALWORKFLOW_ACTIVEDIRECTORYINTEGRATED = 0x02;
+    static final byte ADALWORKFLOW_ACTIVEDIRECTORYMSI = 0x03;
     static final byte FEDAUTH_INFO_ID_STSURL = 0x01; // FedAuthInfoData is token endpoint URL from which to acquire fed
                                                      // auth token
     static final byte FEDAUTH_INFO_ID_SPN = 0x02; // FedAuthInfoData is the SPN to use for acquiring fed auth token

src/main/java/com/microsoft/sqlserver/jdbc/ISQLServerDataSource.java

@@ -805,4 +805,19 @@ public interface ISQLServerDataSource extends javax.sql.CommonDataSource {
      *        indicates whether Bulk Copy API should be used for Batch Insert operations.
      */
     public void setUseBulkCopyForBatchInsert(boolean useBulkCopyForBatchInsert);
+
+    /**
+     * Sets the client id to be used to retrieve access token from MSI EndPoint.
+     * 
+     * @param msiClientId
+     *        Client ID of User Assigned Managed Identity
+     */
+    public void setMSIClientId(String msiClientId);
+
+    /**
+     * Returns the value for the connection property 'msiClientId'.
+     * 
+     * @return msiClientId property value
+     */
+    public String getMSIClientId();
 }

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerADAL4JUtils.java

@@ -37,25 +37,26 @@ static SqlFedAuthToken getSqlFedAuthToken(SqlFedAuthInfo fedAuthInfo, String use
                     ActiveDirectoryAuthentication.JDBC_FEDAUTH_CLIENT_ID, user, password, null);
 
             AuthenticationResult authenticationResult = future.get();
-            SqlFedAuthToken fedAuthToken = new SqlFedAuthToken(authenticationResult.getAccessToken(),
-                    authenticationResult.getExpiresOnDate());
 
-            return fedAuthToken;
+            return new SqlFedAuthToken(authenticationResult.getAccessToken(), authenticationResult.getExpiresOnDate());
         } catch (MalformedURLException | InterruptedException e) {
             throw new SQLServerException(e.getMessage(), e);
         } catch (ExecutionException e) {
             MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_ADALExecution"));
             Object[] msgArgs = {user, authenticationString};
 
-            // the cause error message uses \\n\\r which does not give correct format
-            // change it to \r\n to provide correct format
+            /*
+             * the cause error message uses \\n\\r which does not give correct format change it to \r\n to provide
+             * correct format
+             */
             String correctedErrorMessage = e.getCause().getMessage().replaceAll("\\\\r\\\\n", "\r\n");
             AuthenticationException correctedAuthenticationException = new AuthenticationException(
                     correctedErrorMessage);
 
-            // SQLServerException is caused by ExecutionException, which is caused by
-            // AuthenticationException
-            // to match the exception tree before error message correction
+            /*
+             * SQLServerException is caused by ExecutionException, which is caused by AuthenticationException to match
+             * the exception tree before error message correction
+             */
             ExecutionException correctedExecutionException = new ExecutionException(correctedAuthenticationException);
 
             throw new SQLServerException(form.format(msgArgs), null, 0, correctedExecutionException);
@@ -69,8 +70,10 @@ static SqlFedAuthToken getSqlFedAuthTokenIntegrated(SqlFedAuthInfo fedAuthInfo,
         ExecutorService executorService = Executors.newFixedThreadPool(1);
 
         try {
-            // principal name does not matter, what matters is the realm name
-            // it gets the username in principal_name@realm_name format
+            /*
+             * principal name does not matter, what matters is the realm name it gets the username in
+             * principal_name@realm_name format
+             */
             KerberosPrincipal kerberosPrincipal = new KerberosPrincipal("username");
             String username = kerberosPrincipal.getName();
 
@@ -83,10 +86,8 @@ static SqlFedAuthToken getSqlFedAuthTokenIntegrated(SqlFedAuthInfo fedAuthInfo,
                     ActiveDirectoryAuthentication.JDBC_FEDAUTH_CLIENT_ID, username, null, null);
 
             AuthenticationResult authenticationResult = future.get();
-            SqlFedAuthToken fedAuthToken = new SqlFedAuthToken(authenticationResult.getAccessToken(),
-                    authenticationResult.getExpiresOnDate());
 
-            return fedAuthToken;
+            return new SqlFedAuthToken(authenticationResult.getAccessToken(), authenticationResult.getExpiresOnDate());
         } catch (InterruptedException | IOException e) {
             throw new SQLServerException(e.getMessage(), e);
         } catch (ExecutionException e) {
@@ -97,15 +98,18 @@ static SqlFedAuthToken getSqlFedAuthTokenIntegrated(SqlFedAuthInfo fedAuthInfo,
                 // the case when Future's outcome has no AuthenticationResult but exception
                 throw new SQLServerException(form.format(msgArgs), null);
             } else {
-                // the cause error message uses \\n\\r which does not give correct format
-                // change it to \r\n to provide correct format
+                /*
+                 * the cause error message uses \\n\\r which does not give correct format change it to \r\n to provide
+                 * correct format
+                 */
                 String correctedErrorMessage = e.getCause().getMessage().replaceAll("\\\\r\\\\n", "\r\n");
                 AuthenticationException correctedAuthenticationException = new AuthenticationException(
                         correctedErrorMessage);
 
-                // SQLServerException is caused by ExecutionException, which is caused by
-                // AuthenticationException
-                // to match the exception tree before error message correction
+                /*
+                 * SQLServerException is caused by ExecutionException, which is caused by AuthenticationException to
+                 * match the exception tree before error message correction
+                 */
                 ExecutionException correctedExecutionException = new ExecutionException(
                         correctedAuthenticationException);