Roberto Deandrea created SSHD-1348:
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Summary: Client SSH_FXP_READ() with lenght = 0 causes
SSH_FX_INVALID_PARAMETER into Apache SSHD SFTP Server
Key: SSHD-1348
URL: https://issues.apache.org/jira/browse/SSHD-1348
Project: MINA SSHD
Issue Type: Question
Affects Versions: 2.16.0
Reporter: Roberto Deandrea
Attachments: sftp-read-empty.py
During SFTP client get of empty file setting lenght=0 , Apache SSHD replies
with SSH_FXP_STATUS with SSH_FX_INVALID_PARAMETER.
We have noticed 2 different checks on buffer lenght.
In method SftpSubsystem.doRead() the check on length is the following:
*{color:#242424}ValidateUtils.checkTrue((long)length > 0L, "Invalid read
length: %d", (long)length);{color}*
In method {color:#242424}AbstractSftpSubsystemHelper{color}.doRead() the check
on length is the following :
*{color:#242424}ValidateUtils.checkTrue(readLen >= 0, "Illegal requested read
length: %d", (long)readLen);{color}*
Q1. Is there a reason why the check on length are different ?
Q2. Is possble to read a file setting buffer lenght = 0 ?
Thank you for your cooperation.
Roberto Deandrea
P.S. Attached to this Jira you can find a python script to simply reproduce
this issue.
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