GUACAMOLE-514: Merge support for VNC authentication involving usernames.

src/protocols/vnc/auth.c

@@ -31,3 +31,22 @@ char* guac_vnc_get_password(rfbClient* client) {
     return ((guac_vnc_client*) gc->data)->settings->password;
 }
 
+rfbCredential* guac_vnc_get_credentials(rfbClient* client, int credentialType) {
+    guac_client* gc = rfbClientGetClientData(client, GUAC_VNC_CLIENT_KEY);
+    guac_vnc_settings* settings = ((guac_vnc_client*) gc->data)->settings;
+    
+    if (credentialType == rfbCredentialTypeUser) {
+        rfbCredential *creds = malloc(sizeof(rfbCredential));
+        creds->userCredential.username = settings->username;
+        creds->userCredential.password = settings->password;
+        return creds;
+    }
+
+    guac_client_abort(gc, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
+            "Unsupported credential type requested.");
+    guac_client_log(gc, GUAC_LOG_DEBUG,
+            "Unable to provide requested type of credential: %d.",
+            credentialType);
+    return NULL;
+    
+}

src/protocols/vnc/auth.h

@@ -27,7 +27,7 @@
 
 /**
  * Callback which is invoked by libVNCServer when it needs to read the user's
- * VNC password. As ths user's password, if any, will be stored in the
+ * VNC password. As this user's password, if any, will be stored in the
  * connection settings, this function does nothing more than return that value.
  *
  * @param client
@@ -38,5 +38,23 @@
  */
 char* guac_vnc_get_password(rfbClient* client);
 
+/**
+ * Callback which is invoked by libVNCServer when it needs to read the user's
+ * VNC credentials.  The credentials are stored in the connection settings,
+ * so they will be retrieved from that.
+ * 
+ * @param client
+ *     The rfbClient associated with the VNC connection requiring the
+ *     authentication.
+ * 
+ * @param credentialType
+ *     The credential type being requested, as defined by the libVNCclient
+ *     code in the rfbclient.h header.
+ * 
+ * @return
+ *     The rfbCredential object that contains the required credentials.
+ */
+rfbCredential* guac_vnc_get_credentials(rfbClient* client, int credentialType);
+
 #endif
 

src/protocols/vnc/settings.c

@@ -35,6 +35,7 @@ const char* GUAC_VNC_CLIENT_ARGS[] = {
     "port",
     "read-only",
     "encodings",
+    "username",
     "password",
     "swap-red-blue",
     "color-depth",
@@ -108,6 +109,11 @@ enum VNC_ARGS_IDX {
      */
     IDX_ENCODINGS,
 
+    /**
+     * The username to send to the VNC server if authentication is requested.
+     */
+    IDX_USERNAME,
+    
     /**
      * The password to send to the VNC server if authentication is requested.
      */
@@ -337,6 +343,10 @@ guac_vnc_settings* guac_vnc_parse_args(guac_user* user,
         guac_user_parse_args_int(user, GUAC_VNC_CLIENT_ARGS, argv,
                 IDX_PORT, 0);
 
+    settings->username =
+        guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
+                IDX_USERNAME, ""); /* NOTE: freed by libvncclient */
+    
     settings->password =
         guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
                 IDX_PASSWORD, ""); /* NOTE: freed by libvncclient */

src/protocols/vnc/settings.h

@@ -45,6 +45,11 @@ typedef struct guac_vnc_settings {
      */
     int port;
 
+    /**
+     * The username given in the arguments.
+     */
+    char* username;
+    
     /**
      * The password given in the arguments.
      */

src/protocols/vnc/vnc.c

@@ -153,6 +153,9 @@ rfbClient* guac_vnc_get_client(guac_client* client) {
 
     }
 
+    /* Authentication */
+    rfb_client->GetCredential = guac_vnc_get_credentials;
+    
     /* Password */
     rfb_client->GetPassword = guac_vnc_get_password;