[jira] [Created] (SSHD-1297) Load public key from file

[Daniel Hammer (Jira)]

Daniel Hammer created SSHD-1297:
-----------------------------------

             Summary: Load public key from file
                 Key: SSHD-1297
                 URL: https://issues.apache.org/jira/browse/SSHD-1297
             Project: MINA SSHD
          Issue Type: Bug
    Affects Versions: 2.9.1
            Reporter: Daniel Hammer


Hi SSHD gurus,

I'm attempting to utilize 
{{org.apache.sshd.common.util.buffer.ByteArrayBuffer}} to load a 
{{java.security.PublicKey}} in-order to subsequently register the public key in 
a {{{}org.apache.sshd.server.auth.pubkey.PublickeyAuthenticator{}}}.

Ie. the idea is something like this
{code:java}
PublicKey myPublicKey;
try (InputStream is = new 
FileInputStream("/home/my-user/tmp/test_rsa_key.pub")) {
  ByteArrayBuffer buffer = new 
ByteArrayBuffer(org.apache.sshd.common.util.io.IoUtils.IoUtils.toByteArray(is));
  myPublicKey = buffer.getPublicKey(); // -> OutOfMemoryError: Java heap space 
..?
//  myPublicKey = buffer.getRawPublicKey(); // -> Underflow ..?
}

ServerBuilder.builder()
    .publickeyAuthenticator(new KeySetPublickeyAuthenticator("my id", 
List.of(myPublicKey)))
    .build();
{code}
Resulting in the below exceptions, caused by internal guarding in 
{{ByteArrayBuffer}} before the {{ByteArrayBuffer.data}} would be processed.

{{{}getPublicKey(){}}}:
{code:java}
java.lang.OutOfMemoryError: Java heap space
        at 
org.apache.sshd.common.util.buffer.ByteArrayBuffer.ensureCapacity(ByteArrayBuffer.java:277)
        at 
org.apache.sshd.common.util.buffer.Buffer.ensureCapacity(Buffer.java:1105)
        at 
org.apache.sshd.common.util.buffer.ByteArrayBuffer.wpos(ByteArrayBuffer.java:139)
        at 
org.apache.sshd.common.util.buffer.Buffer.getPublicKey(Buffer.java:521)
        at 
org.apache.sshd.common.util.buffer.Buffer.getPublicKey(Buffer.java:505)
{code}
{{{}getRawPublicKey(){}}}:
{code:java}
org.apache.sshd.common.util.buffer.BufferException: Underflow: 
requested=1936943149, available=737
        at 
app//org.apache.sshd.common.util.buffer.Buffer.ensureAvailable(Buffer.java:640)
        at 
app//org.apache.sshd.common.util.buffer.ByteArrayBuffer.getString(ByteArrayBuffer.java:241)
        at 
app//org.apache.sshd.common.util.buffer.Buffer.getString(Buffer.java:309)
        at 
app//org.apache.sshd.common.util.buffer.Buffer.getRawPublicKey(Buffer.java:541)
        at 
app//org.apache.sshd.common.util.buffer.Buffer.getRawPublicKey(Buffer.java:530)
{code}
Seemingly my approach is incompatible with the available logic, unfortunately 
I've been unable to uncover documentation or Javadoc that could aid.

So as a last resort I'm turning to you gurus, in hopes of enlightenment (+ 
perhaps a PR guiding future developers in the desired direction via 
documentation / Javadoc).

Thanks in advance 🙏



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