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Fail gracefully when reading an OpenSSH Known Hosts file that uses key types requiring BouncyCastle, but we're not including BouncyCastle.

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This commit is contained in:
David Solin
2016-09-09 14:39:21 -05:00
parent 613ace1864
commit 68b924863e
3 changed files with 22 additions and 18 deletions
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14
src/main/java/net/schmizz/sshj/common/Buffer.java
View File

@@ -426,8 +426,18 @@ public class Buffer<T extends Buffer<T>> {
public PublicKey readPublicKey()
throws BufferException {
try {
final String type = readString();
return KeyType.fromString(type).readPubKeyFromBuffer(type, this);
final KeyType type = KeyType.fromString(readString());
switch(type) {
case RSA:
case DSA:
return type.readPubKeyFromBuffer(this);
default:
if (SecurityUtils.isBouncyCastleRegistered()) {
return type.readPubKeyFromBuffer(this);
} else {
throw new BufferException("BouncyCastle is required to read a key of type " + type);
}
}
} catch (GeneralSecurityException e) {
throw new SSHRuntimeException(e);
}

19
src/main/java/net/schmizz/sshj/common/KeyType.java
View File

@@ -46,7 +46,7 @@ public enum KeyType {
/** SSH identifier for RSA keys */
RSA("ssh-rsa") {
@Override
public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
throws GeneralSecurityException {
final BigInteger e, n;
try {
@@ -77,7 +77,7 @@ public enum KeyType {
/** SSH identifier for DSA keys */
DSA("ssh-dss") {
@Override
public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
throws GeneralSecurityException {
BigInteger p, q, g, y;
try {
@@ -114,7 +114,7 @@ public enum KeyType {
private final Logger log = LoggerFactory.getLogger(getClass());
@Override
public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
throws GeneralSecurityException {
try {
// final String algo = buf.readString(); it has been already read
@@ -127,7 +127,7 @@ public enum KeyType {
buf.readRawBytes(y);
if(log.isDebugEnabled()) {
log.debug(String.format("Key algo: %s, Key curve: %s, Key Len: %s, 0x04: %s\nx: %s\ny: %s",
type,
sType,
curveName,
keyLen,
x04,
@@ -176,14 +176,14 @@ public enum KeyType {
ED25519("ssh-ed25519") {
private final Logger log = LoggerFactory.getLogger(KeyType.class);
@Override
public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf) throws GeneralSecurityException {
public PublicKey readPubKeyFromBuffer(Buffer<?> buf) throws GeneralSecurityException {
try {
final int keyLen = buf.readUInt32AsInt();
final byte[] p = new byte[keyLen];
buf.readRawBytes(p);
if (log.isDebugEnabled()) {
log.debug(String.format("Key algo: %s, Key curve: 25519, Key Len: %s\np: %s",
type,
sType,
keyLen,
Arrays.toString(p))
);
@@ -213,9 +213,9 @@ public enum KeyType {
/** Unrecognized */
UNKNOWN("unknown") {
@Override
public PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
public PublicKey readPubKeyFromBuffer(Buffer<?> buf)
throws GeneralSecurityException {
throw new UnsupportedOperationException("Don't know how to decode key:" + type);
throw new UnsupportedOperationException("Don't know how to decode key:" + sType);
}
@Override
@@ -238,7 +238,7 @@ public enum KeyType {
this.sType = type;
}
public abstract PublicKey readPubKeyFromBuffer(String type, Buffer<?> buf)
public abstract PublicKey readPubKeyFromBuffer(Buffer<?> buf)
throws GeneralSecurityException;
public abstract void putPubKeyIntoBuffer(PublicKey pk, Buffer<?> buf);
@@ -263,5 +263,4 @@ public enum KeyType {
public String toString() {
return sType;
}
}

7
src/main/java/net/schmizz/sshj/transport/verification/OpenSSHKnownHosts.java
View File

@@ -207,7 +207,7 @@ public class OpenSSHKnownHosts
if (type != KeyType.UNKNOWN) {
final String sKey = split[i++];
key = getKey(sKey);
key = new Buffer.PlainBuffer(Base64.decode(sKey)).readPublicKey();
} else if (isBits(sType)) {
type = KeyType.RSA;
// int bits = Integer.valueOf(sType);
@@ -232,11 +232,6 @@ public class OpenSSHKnownHosts
}
}
private PublicKey getKey(String sKey)
throws IOException {
return new Buffer.PlainBuffer(Base64.decode(sKey)).readPublicKey();
}
private boolean isBits(String type) {
try {
Integer.parseInt(type);