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<div class=Section1>
<p class=MsoNormal><span lang=EN-US>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I was trying to find a PAM-Radius mailing
list and it seems <span style='color:black'>that this might be the one.</span><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>A Ubuntu 7.4 box needs
to be configured such that SSH users will be authenticated against an external
FreeRadius server. FreeRadius server version is 1.1.7-1build4. The Ubuntu box
uses OpenSSH 4.3-p2 and /etc/ssh/sshd_config is set to “UsePAM yes”. I
downloaded PAM_Radius 1.3.17.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>Below is the procedure
that I use Radius to authenticate a user in /etc/passwd (/etc/shadow doesn’t
have the password for that user).<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US style='color:black'><span style='mso-list:Ignore'>1.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='color:black'>FreeRadius server configures its clients.conf
and user file to include a new user called “test1”.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US style='color:black'><span style='mso-list:Ignore'>2.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='color:black'>On my Ubuntu 7.4 box, add a user with command
“useradd” to add a user “test1” but don’t set a password. So the user “test1”
on the Ubuntu box will be inactive.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US style='color:black'><span style='mso-list:Ignore'>3.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='color:black'>Configure /etc/pam.d/ssh on the Ubuntu box to
use “auth sufficient pam_radius_auth.so”<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US style='color:black'><span style='mso-list:Ignore'>4.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='color:black'>Also update the /etc/raddb/server on the Ubuntu
box to point to the remote Radius server IP. <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
lang=EN-US style='color:black'><span style='mso-list:Ignore'>5.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='color:black'>Try ssh test1@ubuntu box and it worked. Also
monitored the Free Radius logging and it did show that the Access-Request
packets went to Radius server.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>So step 1-5 worked well
for me. Note that at step 2, the user account to be authenticated is added to
/etc/passwd.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>The issue is: if step 2
is omitted, SSH login will fail. ACCESS_REQUEST packets with INCORRECT password
were even sent to the Radius server. Further troubleshooting showed that
PAM_Radius module got a bad password from PAM.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>I did some research
from the website and some emails dated in 2006 said that PAM_Radius can only
authenticate user accounts in /etc/passwd file. Is that right?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>Many thanks in advance,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:black'>Feng<o:p></o:p></span></p>
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