gnodet-bot commented on code in PR #28215:
URL: https://github.com/apache/camel/pull/28215#discussion_r4334341833
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components/camel-ssh/src/main/java/org/apache/camel/component/ssh/ResourceBasedSSHKeyVerifier.java:
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@@ -18,30 +18,66 @@
import java.io.IOException;
import java.io.InputStream;
-import java.math.BigInteger;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
-import java.security.NoSuchAlgorithmException;
+import java.nio.charset.StandardCharsets;
+import java.security.GeneralSecurityException;
+import java.security.MessageDigest;
import java.security.PublicKey;
-import java.security.spec.InvalidKeySpecException;
import java.util.Base64;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.Collections;
+import java.util.Locale;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
import org.apache.camel.CamelContext;
import org.apache.camel.support.ResourceHelper;
-import org.apache.camel.util.IOHelper;
+import org.apache.sshd.client.config.hosts.HostConfigEntry;
import org.apache.sshd.client.keyverifier.ServerKeyVerifier;
import org.apache.sshd.client.session.ClientSession;
-import org.bouncycastle.util.Arrays;
+import org.apache.sshd.client.session.ClientSessionCreator;
+import org.apache.sshd.common.AttributeRepository;
+import org.apache.sshd.common.config.keys.KeyUtils;
+import org.apache.sshd.common.config.keys.PublicKeyEntry;
+import org.apache.sshd.common.config.keys.PublicKeyEntryResolver;
+import org.apache.sshd.common.session.SessionContext;
+import org.apache.sshd.common.util.net.SshdSocketAddress;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ServerKeyVerifier that takes a camel resource as input file to validate the
server key against.
- *
+ * <p>
+ * The resource uses the OpenSSH known_hosts format, and its entries are
matched as OpenSSH matches them. Each host
+ * pattern of an entry is compared, ignoring case, with the host name or
address the client connects to (the host
+ * configured on the endpoint, or the {@code HostName} that {@code
~/.ssh/config} gives for it, as it is written and
+ * never resolved through DNS, so an IPv6 address such as {@code ::1} is not
expanded), written {@code host} for port 22
+ * and {@code [host]:port} for another port: {@code *} and {@code ?} are
wildcards, a pattern starting with {@code !}
+ * excludes the hosts it matches, and hashed entries are supported. The server
is accepted when an entry of its host
+ * lists the key it presents. It is rejected when that key is listed in a
matching {@code @revoked} entry, or when its
+ * host has entries without a marker but none of them lists that key. {@code
failOnUnknownHost} only decides for a host
+ * without such an entry: {@code @revoked} and {@code @cert-authority} entries
do not list a host, and host certificates
+ * are not supported. A resource that cannot be read, or that has a line that
cannot be read, rejects every server.
*/
public class ResourceBasedSSHKeyVerifier implements ServerKeyVerifier {
+ private static final int DEFAULT_PORT = 22;
+ private static final String MARKER_REVOKED = "@revoked";
+ private static final String MARKER_CERT_AUTHORITY = "@cert-authority";
+ private static final String HASHED_HOST_PREFIX = "|1|";
+ private static final String HASH_ALGORITHM = "HmacSHA1";
+ private static final int HASH_LENGTH = 20;
+
+ /**
+ * The host configuration that the client connected with, which the ssh
producer and consumer put in the connection
+ * context of the session: the entries are matched against its {@code
HostName} as it is written. Without it, the
+ * address the client connected to is used, which writes an IPv6 address
such as {@code ::1} in its full form.
+ *
+ * @since 4.24
Review Comment:
💡 **Nit:** The `@since` tag was carried over from the main branch PR
(`4.24`) but this backport lands on `camel-4.22.x` — the first release to
include this API is 4.22.3.
```suggestion
* @since 4.22.3
```
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