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feat: configurable image hosts (#2243)

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Jordan 2023-05-31 16:48:45 +01:00 committed by GitHub
parent a553961c05
commit 03487718e7
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5 changed files with 35 additions and 13 deletions
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8
worldedit-core/src/main/java/com/fastasyncworldedit/core/configuration/Settings.java
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@ -671,6 +671,14 @@ public class Settings extends Config {
})
public int MAX_IMAGE_SIZE = 8294400;
@Comment({
"Whitelist of hostnames to allow images to be downloaded from",
" - Adding '*' to the list will allow any host, but this is NOT adviseable",
" - Crash exploits exist with malformed images",
" - See: https://medium.com/chargebee-engineering/perils-of-parsing-pixel-flood-attack-on-java-imageio-a97aeb06637d"
})
public List<String> ALLOWED_IMAGE_HOSTS = new ArrayList<>(Collections.singleton(("i.imgur.com")));
}
public static class EXTENT {

19
worldedit-core/src/main/java/com/fastasyncworldedit/core/util/MainUtil.java
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@ -52,6 +52,7 @@ import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
@ -68,7 +69,6 @@ import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
@ -81,10 +81,8 @@ import java.util.concurrent.atomic.AtomicLong;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.regex.Pattern;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.GZIPInputStream;
import java.util.zip.Inflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
@ -533,6 +531,21 @@ public class MainUtil {
return readImage(new FileInputStream(file));
}
public static void checkImageHost(URI uri) throws IOException {
if (Settings.settings().WEB.ALLOWED_IMAGE_HOSTS.contains("*")) {
return;
}
String host = uri.getHost();
if (Settings.settings().WEB.ALLOWED_IMAGE_HOSTS.stream().anyMatch(host::equalsIgnoreCase)) {
return;
}
throw new IOException(String.format(
"Host `%s` not allowed! Whitelisted image hosts are: %s",
host,
StringMan.join(Settings.settings().WEB.ALLOWED_IMAGE_HOSTS, ", ")
));
}
public static BufferedImage toRGB(BufferedImage src) {
if (src == null) {
return src;

7
worldedit-core/src/main/java/com/fastasyncworldedit/core/util/image/ImageUtil.java
View File

@ -203,6 +203,7 @@ public class ImageUtil {
arg = "https://i.imgur.com/" + arg.split("imgur.com/")[1] + ".png";
}
URL url = new URL(arg);
MainUtil.checkImageHost(url.toURI());
BufferedImage img = MainUtil.readImage(url);
if (img == null) {
throw new IOException("Failed to read " + url + ", please try again later");
@ -218,7 +219,7 @@ public class ImageUtil {
return MainUtil.readImage(file);
}
throw new InputParseException(Caption.of("fawe.error.invalid-image", TextComponent.of(arg)));
} catch (IOException e) {
} catch (IOException | URISyntaxException e) {
throw new InputParseException(TextComponent.of(e.getMessage()));
}
}
@ -229,7 +230,9 @@ public class ImageUtil {
if (arg.contains("imgur.com") && !arg.contains("i.imgur.com")) {
arg = "https://i.imgur.com/" + arg.split("imgur.com/")[1] + ".png";
}
return new URL(arg).toURI();
URI uri = new URI(arg);
MainUtil.checkImageHost(uri);
return uri;
}
if (arg.startsWith("file:/")) {
arg = arg.replaceFirst("file:/+", "");

7
worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java
View File

@ -134,6 +134,7 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.FileSystems;
import java.util.List;
@ -521,11 +522,9 @@ public class BrushCommands {
@Switch(name = 'a', desc = "Use image Alpha") boolean alpha,
@Switch(name = 'f', desc = "Blend the image with existing terrain") boolean fadeOut
)
throws WorldEditException, IOException {
throws WorldEditException, IOException, URISyntaxException {
URL url = new URL(imageURL);
if (!url.getHost().equalsIgnoreCase("i.imgur.com")) {
throw new IOException("Only i.imgur.com links are allowed!");
}
MainUtil.checkImageHost(url.toURI());
BufferedImage image = MainUtil.readImage(url);
worldEdit.checkMaxBrushRadius(radius);
if (yscale != 1) {

7
worldedit-core/src/main/java/com/sk89q/worldedit/command/GenerationCommands.java
View File

@ -65,6 +65,7 @@ import org.jetbrains.annotations.Range;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.List;
import java.util.concurrent.ExecutorService;
@ -580,12 +581,10 @@ public class GenerationCommands {
@Arg(desc = "boolean", def = "true") boolean randomize,
@Arg(desc = "TODO", def = "100") int threshold,
@Arg(desc = "BlockVector2", def = "") BlockVector2 dimensions
) throws WorldEditException, IOException {
) throws WorldEditException, IOException, URISyntaxException {
TextureUtil tu = Fawe.instance().getCachedTextureUtil(randomize, 0, threshold);
URL url = new URL(imageURL);
if (!url.getHost().equalsIgnoreCase("i.imgur.com")) {
throw new IOException("Only i.imgur.com links are allowed!");
}
MainUtil.checkImageHost(url.toURI());
if (dimensions != null) {
checkCommandArgument(
(long) dimensions.getX() * dimensions.getZ() <= Settings.settings().WEB.MAX_IMAGE_SIZE,