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Bad regex in CORS settings should throw a nicer error #29108

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Bad regex in CORS settings should throw a nicer error #29108

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18 changes: 13 additions & 5 deletions ...ansport-netty4/src/main/java/org/elasticsearch/http/netty4/Netty4HttpServerTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -43,13 +43,15 @@
import io.netty.handler.timeout.ReadTimeoutHandler;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.network.NetworkAddress;
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.SettingsException;
import org.elasticsearch.common.transport.BoundTransportAddress;
import org.elasticsearch.common.transport.NetworkExceptionHelper;
import org.elasticsearch.common.transport.PortsRange;
Expand Down Expand Up @@ -86,6 +88,7 @@
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import static org.elasticsearch.common.util.concurrent.EsExecutors.daemonThreadFactory;
import static org.elasticsearch.http.HttpTransportSettings.SETTING_CORS_ALLOW_CREDENTIALS;
Expand Down Expand Up @@ -366,11 +369,16 @@ static Netty4CorsConfig buildCorsConfig(Settings settings) {
} else if (origin.equals(ANY_ORIGIN)) {
builder = Netty4CorsConfigBuilder.forAnyOrigin();
} else {
Pattern p = RestUtils.checkCorsSettingForRegex(origin);
if (p == null) {
builder = Netty4CorsConfigBuilder.forOrigins(RestUtils.corsSettingAsArray(origin));
} else {
builder = Netty4CorsConfigBuilder.forPattern(p);
try {
Pattern p = RestUtils.checkCorsSettingForRegex(origin);
if (p == null) {
builder = Netty4CorsConfigBuilder.forOrigins(RestUtils.corsSettingAsArray(origin));
} else {
builder = Netty4CorsConfigBuilder.forPattern(p);
}
}
catch (PatternSyntaxException e) {
throw new SettingsException("Bad regex in " + SETTING_CORS_ALLOW_ORIGIN.getKey() + ": " + origin, e);
}
}
if (SETTING_CORS_ALLOW_CREDENTIALS.get(settings)) {
Expand Down
13 changes: 13 additions & 0 deletions ...rt-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpServerTransportTests.java
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Expand Up @@ -44,6 +44,7 @@
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.SettingsException;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.unit.TimeValue;
Expand Down Expand Up @@ -75,6 +76,7 @@
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.PatternSyntaxException;
import java.util.stream.Collectors;

import static org.elasticsearch.common.Strings.collectionToDelimitedString;
Expand Down Expand Up @@ -148,6 +150,17 @@ public void testCorsConfigWithDefaults() {
assertFalse(corsConfig.isCredentialsAllowed());
}

public void testCorsConfigWithBadRegex() {
final Settings settings = Settings.builder()
.put(SETTING_CORS_ENABLED.getKey(), true)
.put(SETTING_CORS_ALLOW_ORIGIN.getKey(), "/[*/")
.put(SETTING_CORS_ALLOW_CREDENTIALS.getKey(), true)
.build();
SettingsException e = expectThrows(SettingsException.class, () -> Netty4HttpServerTransport.buildCorsConfig(settings));
assertThat(e.getMessage(), containsString("Bad regex in http.cors.allow-origin: /[*/"));
assertThat(e.getCause(), instanceOf(PatternSyntaxException.class));
}

/**
* Test that {@link Netty4HttpServerTransport} supports the "Expect: 100-continue" HTTP header
* @throws InterruptedException if the client communication with the server is interrupted
Expand Down