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From "Dayakar Morem (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (NIFI-7049) SFTP processors shouldn't silently try to access known hosts file of the user
Date Tue, 04 Feb 2020 06:07:00 GMT

     [ https://issues.apache.org/jira/browse/NIFI-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dayakar Morem resolved NIFI-7049.
---------------------------------
    Fix Version/s: 1.12.0
       Resolution: Fixed

> SFTP processors shouldn't silently try to access known hosts file of the user
> -----------------------------------------------------------------------------
>
>                 Key: NIFI-7049
>                 URL: https://issues.apache.org/jira/browse/NIFI-7049
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 1.10.0
>            Reporter: Arpad Boda
>            Assignee: Dayakar Morem
>            Priority: Major
>             Fix For: 1.12.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> In case NiFi test are executed on a machine without knows_hosts file, it's going to fail:
> {code}
> [INFO] Running org.apache.nifi.processors.standard.TestGetSFTP
> [ERROR] Tests run: 2, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 0.374 s <<<
FAILURE! - in org.apache.nifi.processors.standard.TestGetSFTP
> [ERROR] testGetSFTPFileBasicRead(org.apache.nifi.processors.standard.TestGetSFTP)  Time
elapsed: 0.132 s  <<< FAILURE!
> java.lang.AssertionError: expected:<4> but was:<0>
> 	at org.apache.nifi.processors.standard.TestGetSFTP.testGetSFTPFileBasicRead(TestGetSFTP.java:88)
> [ERROR] testGetSFTPIgnoreDottedFiles(org.apache.nifi.processors.standard.TestGetSFTP)
 Time elapsed: 0.013 s  <<< FAILURE!
> java.lang.AssertionError: expected:<2> but was:<0>
> 	at org.apache.nifi.processors.standard.TestGetSFTP.testGetSFTPIgnoreDottedFiles(TestGetSFTP.java:110)
> {code}
> Just pasting my private message that summarised this error previously:
> https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/util/SFTPTransfer.java#L556
> So the problem is that host key file is not a mandatory, but  in case it’s not provided,
we call load on the 3rd party lib without arguments:
> https://github.com/hierynomus/sshj/blob/master/src/main/java/net/schmizz/sshj/SSHClient.java#L621
> Which tries to load keys from the default location, but this is far from what we state
in our documentation:
> {code}Host Key File            If supplied, the given file will be used as the Host Key;
otherwise, no use host key file will be used {code}
> So there are multiple issues here:
> -Even though the ssh connection fails, somewhere the IO exception is swallowed. Didn’t
reproduce to check the logs, but I would expect exceptions to be thrown in the testcase and
these being talkative about the error. My gut feeling says that we do the same in case the
user specifies a host key file, but it’s somehow not accessible.
> -Strict host check on/off might not be enough to cover all the scenarios as there are
three: host 1# known and key matches, 2# host not known and we either trust or not, 3# host
known, but there is a mismatch (probably man in the middle). I think this property should
be improved at least in documentation point of view as currently only the code tells what
do we do in 2#. Which depends on whether the file exists or not, so most probably something
unintended.
> -Either the documentation or the behaviour should be fixed to make them aligned 
> -The testcase should either use a predefined key or have host key checking completely
off. According to what we see above, not sure about the latter being nicely supported.



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