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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"> Bitman asked me to mention my problem and solution on the list, so here it goes.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">We use before authorization script to determine priv-lvl of a user for particular hosts. The trouble started, when i moved tacacs from and old P3 to a proper dual-core HP proliant debian server. Tacacs version change was from 4.0.4.9 to 4.0.4.14. The trouble iself is that before authorization script returns 1 (at least tacacs thinks it does.) most of the time, sometimes it worked fine. There is no way the script would return 1, it always returns 2...</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Log shows:</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Mon Sep 8 11:09:27 2008 [1799]: Error 172.16.108.130: Process write failure</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Mon Sep 8 11:09:27 2008 [1799]: cmd /bin/bash /etc/tac-plus/hp-exec.sh $user $name returns 1 (unconditional deny)</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">There is a fix however. Turns out, the script is too fast on the new machine, so adding a line like sleep 1 to a bash script fixes this behaviour. Which in itself is strange. I actually wrote a perl script, to test, maybe there was some problem with my previous bash script. But perl script run even faster and i couldn't log in at all, but introducing even 10 microseconds of delay, again fixed the problem.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I know for sure that if the script runs under: real 0m0.002s, then there will be problems.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I discovered it when Bitman advised me to run strace against tacacs, and when running strace everything worked fine. I was quite confused atthat point. But then he suggested it was probably time related, so i tried to introduce some lag to my script, and it worked.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">This by the way is with:</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Linux version 2.6.18-4-686 (Debian 2.6.18.dfsg.1-12etch2) (gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21))</p>
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