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Send ext-info-c with kex algorithms (#622)

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Some SSH servers will not honor the negotiated rsa-sha2-256 algorithms
if the client does not indicate support for SSH_MSG_EXT_INFO messages.
Since we only need to accept these messages, but are free to ignore
their contents, adding support amounts to sending "ext-info-c" with our
kex algorithm proposal.
This commit is contained in:
Fabian Henneke
2020-07-20 15:54:28 +02:00
committed by GitHub
parent a5efdf1f0d
commit 64f448d438
4 changed files with 43 additions and 1 deletions
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4
src/main/java/net/schmizz/sshj/DefaultConfig.java
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@@ -20,6 +20,7 @@ import com.hierynomus.sshj.key.KeyAlgorithms;
import com.hierynomus.sshj.transport.cipher.BlockCiphers;
import com.hierynomus.sshj.transport.cipher.StreamCiphers;
import com.hierynomus.sshj.transport.kex.DHGroups;
import com.hierynomus.sshj.transport.kex.ExtInfoClientFactory;
import com.hierynomus.sshj.transport.kex.ExtendedDHGroups;
import com.hierynomus.sshj.transport.mac.Macs;
import com.hierynomus.sshj.userauth.keyprovider.OpenSSHKeyV1KeyFile;
@@ -125,7 +126,8 @@ public class DefaultConfig
ExtendedDHGroups.Group16SHA256(),
ExtendedDHGroups.Group16SHA384AtSSH(),
ExtendedDHGroups.Group16SHA512AtSSH(),
ExtendedDHGroups.Group18SHA512AtSSH());
ExtendedDHGroups.Group18SHA512AtSSH(),
new ExtInfoClientFactory());
} else {
setKeyExchangeFactories(DHGroups.Group1SHA1(), new DHGexSHA1.Factory());
}

1
src/main/java/net/schmizz/sshj/common/Message.java
View File

@@ -25,6 +25,7 @@ public enum Message {
DEBUG(4),
SERVICE_REQUEST(5),
SERVICE_ACCEPT(6),
EXT_INFO(7),
KEXINIT(20),
NEWKEYS(21),

3
src/main/java/net/schmizz/sshj/transport/TransportImpl.java
View File

@@ -529,6 +529,9 @@ public final class TransportImpl
case SERVICE_ACCEPT:
gotServiceAccept();
break;
case EXT_INFO:
log.debug("Received SSH_MSG_EXT_INFO");
break;
case USERAUTH_BANNER:
log.debug("Received USERAUTH_BANNER");
break;