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package com.trend.cloudone.amaas;
import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLException;
import io.grpc.ManagedChannel;
import io.grpc.netty.GrpcSslContexts;
import io.grpc.netty.NettyChannelBuilder;
import io.grpc.Status;
import io.grpc.stub.StreamObserver;
import io.grpc.stub.CallStreamObserver;
import io.grpc.StatusRuntimeException;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import io.netty.handler.ssl.SslContext;
import com.google.protobuf.ByteString;
import com.trend.cloudone.amaas.scan.ScanGrpc;
import com.trend.cloudone.amaas.scan.ScanOuterClass;
import com.trend.cloudone.amaas.scan.ScanOuterClass.Stage;
/**
* AMaaS Client connecting to AMaaS gRPC server to provide API for malware scanning services. User can use the API
* to scan a file or a byte buffer.
*/
public final class AMaasClient {
private static final Logger logger = Logger.getLogger(AMaasClient.class.getName());
private static final long DEFAULT_SCAN_TIMEOUT = 300;
private static final int MAX_NUM_OF_TAGS = 8;
private static final int MAX_LENGTH_OF_TAG = 63;
private ManagedChannel channel;
private ScanGrpc.ScanStub asyncStub;
private AMaasCallCredentials cred;
private long timeoutSecs = DEFAULT_SCAN_TIMEOUT; // 3 minutes
private boolean bulk = true;
/**
* AMaaSClient constructor. The enabledTLS is default to true and the appName is default to V1FS.
* @param region region you obtained your api key
* @param apiKey api key to be used
* @param timeoutInSecs number in seconds to wait for a scan. 0 default to 180 seconds.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*
*/
public AMaasClient(final String region, final String apiKey, final long timeoutInSecs) throws AMaasException {
this(region, null, apiKey, timeoutInSecs, true, null);
}
/**
* AMaaSClient constructor.
* @deprecated
* @param region region we obtained your api key
* @param apiKey api key to be used
* @param timeoutInSecs number in seconds to wait for a scan. 0 default to 180 seconds.
* @param enabledTLS boolean flag to enable or disable TLS
* @param appName application name to use.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*
*/
@Deprecated
public AMaasClient(final String region, final String apiKey, final long timeoutInSecs, final boolean enabledTLS, final String appName) throws AMaasException {
this(region, null, apiKey, timeoutInSecs, enabledTLS, null);
}
/**
* AMaaSClient constructor.
* @param region region we obtained your api key. If host is given, region is ignored.
* @param host AMaas scanner host address. Null if to use Trend AMaaS service specified in region.
* @param apiKey api key to be used
* @param timeoutInSecs number in seconds to wait for a scan. 0 default to 180 seconds.
* @param enabledTLS boolean flag to enable or disable TLS
* @param caCertPath File path of the CA certificate for hosted AMaaS Scanner server. null if using Trend AMaaS service.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*
*/
public AMaasClient(final String region, final String host, final String apiKey, final long timeoutInSecs, final boolean enabledTLS, final String caCertPath) throws AMaasException {
String target = this.identifyHostAddr(region, host);
if (target == null || target == "") {
throw new AMaasException(AMaasErrorCode.MSG_ID_ERR_INVALID_REGION, region, AMaasRegion.getAllRegionsAsString());
}
if (enabledTLS) {
log(Level.FINE, "Using prod grpc service {0}", target);
String verifyCertEnv = System.getenv("TM_AM_DISABLE_CERT_VERIFY");
boolean verifyCert = !("1".equals(verifyCertEnv));
SslContext context;
try {
if (!verifyCert) {
// Bypassing certificate verification
log(Level.FINE, "Bypassing certificate verification");
context = GrpcSslContexts.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
} else {
if (caCertPath != null && !caCertPath.isEmpty()) {
// Bring Your Own Certificate case
log(Level.FINE, "Using certificate {0}", caCertPath);
File certFile = Paths.get(caCertPath).toFile();
context = GrpcSslContexts.forClient().trustManager(certFile).build();
} else {
// Default SSL credentials case
log(Level.FINE, "Using default certificate");
context = GrpcSslContexts.forClient().build();
}
}
} catch (SSLException | UnsupportedOperationException e) {
throw new AMaasException(AMaasErrorCode.MSG_ID_ERR_LOAD_SSL_CERT);
}
this.channel = NettyChannelBuilder.forTarget(target)
.sslContext(context)
.build();
} else {
log(Level.FINE, "Using grpc service with TLS disenabled {0}", target);
this.channel = NettyChannelBuilder.forTarget(target)
.usePlaintext()
.build();
}
if (apiKey != null) {
this.cred = new AMaasCallCredentials(apiKey, AMaasConstants.V1FS_APP);
} else {
throw new AMaasException(AMaasErrorCode.MSG_ID_ERR_MISSING_AUTH);
}
if (timeoutInSecs > 0) {
this.timeoutSecs = timeoutInSecs;
}
this.asyncStub = ScanGrpc.newStub(this.channel).withCallCredentials(this.cred);
}
@Override
protected void finalize() {
try {
this.channel.shutdownNow().awaitTermination(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
log(Level.WARNING, "Finalizing AMaaSClient throws exception: {0}", e.getMessage());
}
}
private String identifyHostAddr(final String region, final String host) {
if (host != null && !host.isEmpty()) {
return host;
}
return AMaasRegion.getServiceFqdn(region);
}
private static void log(final Level level, final String msg, final Object... params) {
logger.log(level, msg, params);
}
/**
* Class to handle the bidirection request and response messages on the gRPC channel between the SDK client and the scan server.
* It implements the callback handlers of the response StreamObserver.
*/
static class AMaasServerCallback implements StreamObserver {
private static final int POLL_TIME_MILLIS = 200;
private StreamObserver requestObserver;
private AMaasReader reader;
private CountDownLatch finishCond = new CountDownLatch(1);
private Boolean done = false;
private String scanResult = null;
private Status.Code grpcStatus = Status.Code.UNKNOWN;
private int fetchCount = 0;
private long fetchSize = 0;
private boolean bulk = true;
private long start = System.currentTimeMillis();
private long timeoutSecs;
AMaasServerCallback() {
}
private AMaasException processError() {
AMaasException err = null;
if (this.grpcStatus == Status.Code.UNAUTHENTICATED) {
err = new AMaasException(AMaasErrorCode.MSG_ID_ERR_KEY_AUTH_FAILED);
} else {
err = new AMaasException(AMaasErrorCode.MSG_ID_GRPC_ERROR, this.grpcStatus.value(), this.grpcStatus.toString());
}
return err;
}
protected String waitTilExit() throws AMaasException {
try {
while (!this.done) {
this.finishCond.await();
}
} catch (InterruptedException err) {
throw new AMaasException(AMaasErrorCode.MSG_ID_ERR_UNEXPECTED_INTERRUPT);
}
if (this.grpcStatus == Status.Code.OK) {
return this.scanResult;
} else {
throw this.processError();
}
}
protected void setContext(final StreamObserver requestObserver, final AMaasReader reader, final boolean bulk, final long timeoutSecs) {
this.requestObserver = requestObserver;
this.reader = reader;
this.done = false;
this.bulk = bulk;
this.timeoutSecs = timeoutSecs;
}
@Override
public void onNext(final ScanOuterClass.S2C s2cMsg) {
log(Level.FINE, "Got message {0} at {1}", s2cMsg.getCmdValue(), s2cMsg.getBulkLengthCount());
final CallStreamObserver callObserver = (CallStreamObserver) requestObserver;
switch (s2cMsg.getCmd()) {
case CMD_RETR:
if (s2cMsg.getStage() != Stage.STAGE_RUN) {
log(Level.INFO, "Received unexpected command RETR at stage {0}", s2cMsg.getStage());
requestObserver.onError(new StatusRuntimeException(Status.ABORTED));
}
java.util.List bulkLength;
java.util.List bulkOffset;
if (this.bulk) {
log(Level.FINE, "enter bulk mode");
int bulkCount = s2cMsg.getBulkLengthCount();
if (bulkCount > 1) {
log(Level.INFO, "bulk transfer triggered");
}
bulkLength = s2cMsg.getBulkLengthList();
bulkOffset = s2cMsg.getBulkOffsetList();
} else {
bulkLength = Arrays.asList(new Integer[]{s2cMsg.getLength()});
bulkOffset = Arrays.asList(new Integer[]{s2cMsg.getOffset()});
}
for (int i = 0; i < bulkLength.size(); i++) {
log(Level.INFO, "Bulk read length={0} at offset={1}", bulkLength.get(i).intValue(), bulkOffset.get(i).intValue());
byte[] bytes = new byte[bulkLength.get(i).intValue()];
try {
int rtnLength = reader.readBytes(bulkOffset.get(i).intValue(), bytes);
ByteString bytestr = ByteString.copyFrom(bytes);
this.fetchCount++;
this.fetchSize += rtnLength;
ScanOuterClass.C2S request = ScanOuterClass.C2S.newBuilder().setStage(Stage.STAGE_RUN).setChunk(bytestr).setOffset(bulkOffset.get(i).intValue()).build();
while (!callObserver.isReady()) {
try {
Thread.sleep(this.POLL_TIME_MILLIS);
log(Level.FINE, "stream is not ready yet, sleep {0}ms", this.POLL_TIME_MILLIS);
} catch (InterruptedException e) {
log(Level.INFO, "Receive interrupt during callObserver wait, reason: " + e.getMessage());
}
long duration = System.currentTimeMillis() - this.start;
if (TimeUnit.MILLISECONDS.toSeconds(duration) > this.timeoutSecs) {
log(Level.INFO, "DEADLINE_EXCEEDED {0}", duration);
requestObserver.onError(new StatusRuntimeException(Status.DEADLINE_EXCEEDED));
return;
}
}
requestObserver.onNext(request);
} catch (IOException e) {
log(Level.SEVERE, "Exception when processing server message", e.getMessage());
requestObserver.onError(new StatusRuntimeException(Status.ABORTED));
}
}
break;
case CMD_QUIT:
this.scanResult = s2cMsg.getResult();
log(Level.INFO, "Scan succeeded: result={0} fetchCount={1} fetchSize={2}.", this.scanResult, this.fetchCount, this.fetchSize);
requestObserver.onCompleted();
break;
default:
log(Level.WARNING, "Unknown command");
requestObserver.onError(new StatusRuntimeException(Status.INVALID_ARGUMENT));
}
}
@Override
public void onError(final Throwable t) {
log(Level.WARNING, "scan Failed: {0}", Status.fromThrowable(t));
this.done = true;
this.grpcStatus = Status.fromThrowable(t).getCode();
this.finishCond.countDown();
}
@Override
public void onCompleted() {
log(Level.INFO, "File successfully scanned.");
this.done = true;
this.grpcStatus = Status.Code.OK;
this.finishCond.countDown();
}
}
static AMaasException getTagListErrors(final String[] tagList) {
AMaasException except = null;
if (tagList.length > MAX_NUM_OF_TAGS) {
except = new AMaasException(AMaasErrorCode.MSG_ID_ERR_MAX_NUMBER_OF_TAGS, MAX_NUM_OF_TAGS);
}
for (String tag: tagList) {
if (tag == null || tag == "" || (tag.length() > MAX_LENGTH_OF_TAG)) {
except = new AMaasException(AMaasErrorCode.MSG_ID_ERR_LENGTH_OF_TAG, MAX_LENGTH_OF_TAG, tag);
break;
}
}
return except;
}
/*
* Private method to scan a AMaasReader and return the scanned result
*
* @param reader AMaasReader to be scanned.
* @param tagList List of tags.
* @param pml flag to indicate whether to use predictive machine learning detection.
* @param feedback flag to indicate whether to use Trend Micro Smart Protection Network's Smart Feedback.
* @param verbose flag to enable log verbose mode
* @param digest flag to enable calculation of digests for cache search and result lookup.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
private String scanRun(final AMaasReader reader, final String[] tagList, final boolean pml, final boolean feedback, final boolean verbose, final boolean digest) throws AMaasException {
long fileSize = reader.getLength();
AMaasServerCallback serverCallback = new AMaasServerCallback();
StreamObserver requestObserver = this.asyncStub.withDeadlineAfter(this.timeoutSecs, TimeUnit.SECONDS).run(serverCallback);
// initialize the callback context before proceeding
serverCallback.setContext(requestObserver, reader, this.bulk, this.timeoutSecs);
String sha1Str = reader.getHash(AMaasReader.HashType.HASH_SHA1);
String sha256Str = reader.getHash(AMaasReader.HashType.HASH_SHA256);
log(Level.FINE, "sha1={0} sha256={1}", sha1Str, sha256Str);
ScanOuterClass.C2S.Builder builder = ScanOuterClass.C2S.newBuilder().setStage(Stage.STAGE_INIT).setFileName(reader.getIdentifier()).setRsSize(fileSize).setOffset(0).setFileSha1(sha1Str).setFileSha256(sha256Str).setTrendx(pml).setSpnFeedback(feedback).setBulk(this.bulk).setVerbose(verbose);
if (tagList != null) {
AMaasException except = getTagListErrors(tagList);
if (except != null) {
throw except;
}
builder.addAllTags(Arrays.asList(tagList));
}
ScanOuterClass.C2S request = builder.build();
requestObserver.onNext(request);
String scanResult = serverCallback.waitTilExit();
return scanResult;
}
/**
* Scan a file and return the scanned result.
*
* @param fileName Full path of a file to be scanned.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
public String scanFile(final String fileName) throws AMaasException {
return this.scanFile(fileName, null, false, false, false, true);
}
/**
* Scan a file and return the scanned result.
*
* @deprecated
* @param fileName Full path of a file to be scanned.
* @param tagList List of tags.
* @param pml flag to indicate whether to enable predictive machine learning detection.
* @param feedback flag to indicate whether to use Trend Micro Smart Protection Network's Smart Feedback.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
@Deprecated
public String scanFile(final String fileName, final String[] tagList, final boolean pml, final boolean feedback) throws AMaasException {
AMaasFileReader fileReader = new AMaasFileReader(fileName, true);
return this.scanRun(fileReader, tagList, pml, feedback, false, true);
}
/**
* Scan a file and return the scanned result.
*
* @param fileName Full path of a file to be scanned.
* @param tagList List of tags.
* @param pml flag to indicate whether to enable predictive machine learning detection.
* @param feedback flag to indicate whether to use Trend Micro Smart Protection Network's Smart Feedback.
* @param verbose flag to enable log verbose mode
* @param digest flag to enable calculation of digests for cache search and result lookup.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
public String scanFile(final String fileName, final String[] tagList, final boolean pml, final boolean feedback, final boolean verbose, final boolean digest) throws AMaasException {
AMaasFileReader fileReader = new AMaasFileReader(fileName, digest);
return this.scanRun(fileReader, tagList, pml, feedback, verbose, digest);
}
/**
* Scan a buffer and return the scanned result.
*
* @param buffer the buffer to be scanned.
* @param identifier A unique name to identify the buffer.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
public String scanBuffer(final byte[] buffer, final String identifier) throws AMaasException {
return this.scanBuffer(buffer, identifier, null, false, false, false, true);
}
/**
* Scan a buffer and return the scanned result. (TBD: LSK remove this API).
*
* @deprecated
* @param buffer the buffer to be scanned.
* @param identifier A unique name to identify the buffer.
* @param tagList List of tags.
* @param pml flag to indicate whether to use predictive machine learning detection.
* @param feedback flag to indicate whether to use Trend Micro Smart Protection Network's Smart Feedback.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
@Deprecated
public String scanBuffer(final byte[] buffer, final String identifier, final String[] tagList, final boolean pml, final boolean feedback) throws AMaasException {
AMaasBufferReader bufReader = new AMaasBufferReader(buffer, identifier, true);
return this.scanRun(bufReader, tagList, pml, feedback, false, true);
}
/**
* Scan a buffer and return the scanned result.
*
* @param buffer the buffer to be scanned.
* @param identifier A unique name to identify the buffer.
* @param tagList List of tags.
* @param pml flag to indicate whether to use predictive machine learning detection.
* @param feedback flag to indicate whether to use Trend Micro Smart Protection Network's Smart Feedback.
* @param verbose flag to enable log verbose mode
* @param digest flag to enable calculation of digests for cache search and result lookup.
* @return String the scanned result in JSON format.
* @throws AMaasException if an exception is detected, it will convert to AMassException.
*/
public String scanBuffer(final byte[] buffer, final String identifier, final String[] tagList, final boolean pml, final boolean feedback, final boolean verbose, final boolean digest) throws AMaasException {
AMaasBufferReader bufReader = new AMaasBufferReader(buffer, identifier, digest);
return this.scanRun(bufReader, tagList, pml, feedback, verbose, digest);
}
}