[JSch-users] JSchException "timeout in wating for rekeying process." caused by waiting for user answer

[Alexander Koshevoy]

Hi!

We are using JSch library 0.1.52 and have a difficulty dealing with
timeout on establishing connection. The problem is that after a user
answers prompt dialog "The authenticity of host '***' can't be
established. RSA key fingerprint is ***. Are you sure you want to
continue connecting?" JSchException with "timeout in wating for rekeying
process." message is thrown by JSch Session (under some circumstances):
com.jcraft.jsch.JSchException: timeout in wating for rekeying process.
at com.jcraft.jsch.Session.write(Session.java:1339)
at com.jcraft.jsch.Session.send_newkeys(Session.java:695)
at com.jcraft.jsch.Session.connect(Session.java:348)
...

Steps to reproduce:
1. Be sure that the host we are connecting to is not in
~/.ssh/known_hosts (e.g. empty it)
2. Set com.jcraft.jsch.Session#setUserInfo(UserInfo) with implementation
that returns result from com.jcraft.jsch.UserInfo#promptYesNo() in
several seconds
3. Invoke com.jcraft.jsch.Session#connect(int) with timeout value that
is less than in step 2
4. Get JSchException

It seems that timeout value passed to Session#connect(int) method
applies both to user answer time from UI and server interaction time.
Might it be justly if user interaction had been excluded from timeout value?

Kind regards,
Alexander

[Atsuhiko Yamanaka]

Hi,

Sorry for my long long delay.

On Mon, Jul 6, 2015 at 5:58 PM, Alexander Koshevoy

Post by Alexander Koshevoy
We are using JSch library 0.1.52 and have a difficulty dealing with
timeout on establishing connection. The problem is that after a user
answers prompt dialog "The authenticity of host '***' can't be
established. RSA key fingerprint is ***. Are you sure you want to
continue connecting?" JSchException with "timeout in wating for rekeying

...

Post by Alexander Koshevoy
It seems that timeout value passed to Session#connect(int) method
applies both to user answer time from UI and server interaction time.
Might it be justly if user interaction had been excluded from timeout value?

Here is a patch to exclude user interaction time from timeout value.


Sincerely,
--
Atsuhiko Yamanaka
JCraft,Inc.
1-14-20 HONCHO AOBA-KU,
SENDAI, MIYAGI 980-0014 Japan.
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Skype callto://jcraft/
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