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Posted to dev@mina.apache.org by "gantzm (via GitHub)" <gi...@apache.org> on 2023/06/29 13:23:22 UTC
[GitHub] [mina-sshd] gantzm opened a new issue, #392: SCP failed with "Permission denied" and error not reported to user code.
gantzm opened a new issue, #392:
URL: https://github.com/apache/mina-sshd/issues/392
### Version
2.10.0
### Bug description
I'm attempting to scp a file from a Dropbear instance. I don't have permissions to copy the file. Dropbear reports permission denied, but that failure is never reported up to the calling code.
### Actual behavior
The ScpHelper class logged this:
`receiveNextCmd - ACK=1: scp: /directory1/directory2/file.xml: Permission denied`
But this error appears to get ignored and never reported back to my calling code. I don't receive any calls to my instance of ScpTransferEventListener. The call to download on the ScpClient just returns, no exceptions or anything.
When I look at the code in ScpHelper it appears to just log the error ACK and continue on:
```
// NOTE: we rely on the fact that an SCP command does not start with an ACK code
protected int receiveNextCmd() throws IOException {
int c = in.read();
if (c == -1) {
return c;
}
if (c == ScpAckInfo.OK) {
return c;
}
if ((c == ScpAckInfo.WARNING) || (c == ScpAckInfo.ERROR)) {
String line = ScpIoUtils.readLine(in, csIn, true);
if (log.isDebugEnabled()) {
log.debug("receiveNextCmd - ACK={}", new ScpAckInfo(c, line));
}
}
return c;
}
```
### Expected behavior
I would expect this information to show up in the ScpAckInfo parameter of a call to handleFileEventAckInfo. Or possibly an exception thrown to indicate a failure.
### Relevant log output
```Shell
receiveNextCmd - ACK=1: scp: /directory1/directory2/file.xml: Permission denied
```
### Other information
_No response_
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Re: [I] SCP failed with "Permission denied" and error not reported to user code. [mina-sshd]
Posted by "lgoldstein (via GitHub)" <gi...@apache.org>.
lgoldstein commented on issue #392:
URL: https://github.com/apache/mina-sshd/issues/392#issuecomment-1805289578
See also [#428](https://github.com/apache/mina-sshd/issues/428)
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Re: [I] SCP failed with "Permission denied" and error not reported to user code. [mina-sshd]
Posted by "tomaswolf (via GitHub)" <gi...@apache.org>.
tomaswolf commented on issue #392:
URL: https://github.com/apache/mina-sshd/issues/392#issuecomment-1877541569
Should have been fixed by commit f908189c41a.
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Re: [I] SCP failed with "Permission denied" and error not reported to user code. [mina-sshd]
Posted by "tomaswolf (via GitHub)" <gi...@apache.org>.
tomaswolf closed issue #392: SCP failed with "Permission denied" and error not reported to user code.
URL: https://github.com/apache/mina-sshd/issues/392
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Re: [I] SCP failed with "Permission denied" and error not reported to user code. [mina-sshd]
Posted by "lgoldstein (via GitHub)" <gi...@apache.org>.
lgoldstein commented on issue #392:
URL: https://github.com/apache/mina-sshd/issues/392#issuecomment-1805867927
See my reply for PR#428 - it may be the case that the server is signalling the permissions problem as a WARNING rather than an ERROR (see also the proposed fix for next version). Thank you though for helping focus the problematic code block - it helped a lot in diagnosing this issue as weel as PR#428
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