[RADIATOR] Executing an external script from Radiator
Alan Buxey
A.L.M.Buxey at lboro.ac.uk
Wed Jun 29 02:13:05 CDT 2011
Theres a a lot of external shell stuff going on there. Personally I would be using built in perl functions and perl modules for handling the strings and dealing with that URL. It's then also easier to do sanity checks , as this stands you could get some very interesting results with the correctly formed username and/or password (out of scope for this list, suggest looking into secure coding or best practice perl references)
alan
----- Reply message -----
From: "M P" <antmtp at hotmail.com>
Date: Wed, Jun 29, 2011 05:31
Subject: [RADIATOR] Executing an external script from Radiator
To: "mvb at sanger.ac.uk" <mvb at sanger.ac.uk>
Cc: "radiator at open.com.au" <radiator at open.com.au>
Hello Martin,
Thank you for the hint. I am now able to get the two values.
Now, I have a follow-up question. What is your recommended way to send the reply back to the user, be it an Access-Accept or Access-Reject? I am thinking of adding the reply back whatever the output of my if statement when comparing the password received from the user and the password I got from my wget command.
Below is my updated BASH script for your reference.
- - - < s n i p > - - -
#!/bin/bash
HOST=192.168.1.101
HTTP_PORT=80
RETVAL=0
set -x
function die()
{
echo -e "$@" >> /var/log/messages
exit 1
}
while read LINE
do
if [[ $LINE =~ User-Name ]] ; then
USERNAME=$(echo $LINE | awk -F'61|@' '{print $2}')
fi
if [[ $LINE =~ User-Password ]] ; then
&nb sp; PASSWORD=$(echo $LINE | awk -F'= ' '{print $2}' | awk -F'"|"' '{print $2}')
fi
done
if echo "" | telnet $HOST $HTTP_PORT 2>&1 | grep -i Connected ; then
URL="http://$HOST/credentials.php?command=password_retrieve&phonenumber=$USERNAME"
if [ $PASSWORD == $(wget -c -O - $URL | cut -d\| -f 1) ] ; then
# Make an Access-Accept reply to the user.
else
# Make an Access-Reject reply to the user.
fi
else
die "ERROR: The $HOST is down or unreachable on $(date)."
fi
exit ${RETVAL}
- - - < s n i p > - - -
Please advice. Thank you in advance.
Regards,
MP
Date: Tue, 28 Jun 2011 12:04:54 +0100
From: mvb at sanger.ac.uk
To: radiator at open.com.au
Subject: Re: [RADIATOR] Executing an external script from Radiator
You're not iterating over stdin.
Try something like:
martin at apollo:~$ cat test.sh
#!/bin/bash
#iterate over stdin and pull out the relevant fields.
while read LINE
do
if [[ $LINE =~ User-Name ]]; then
USERNAME=$( echo $LINE | awk -F'= ' '{print $2}')
fi
if [[ $LINE =~ User-Password ]]; then
PASSWORD=$( echo $LINE | awk -F'= ' '{print $2}')
fi
done
echo username is $USERNAME
echo password is $PASSWORD
martin at apollo:~$ echo -e "User-Name = \"Fred\"\nUser-Password =
\"supersecret\"" | ./test.sh
username is "Fred"
password is "supersecret"
On 28/06/11 10:00, M P wrote:
>
> Hello all,
>
> If you have noticed, I am trying to get the values of the User-Name and User-Password attributes in my BASH script that is being ex
ecuted by the Command parameter inside my <AuthBy EXTERNAL> clause. In my test, I can only get the value of the User-Name attribute but not with the User-Password attribute as it appears blank. If I can pass the value of the User-Password attribute to the $PASSWORD variable, I will be able to compare it with the return value when I do the wget command.
>
> Please advice on how am I able to proceed from here.
>
> Regards,
>
> MP
>
>
> From: antmtp at hotmail.com
> To: radiator at open.com.au
> Date: Tue, 28 Jun 2011 14:50:51 +0800
> Subject: Re: [RADIATOR] Executing an external script from Radiator
>
>
>
>
>
>
>
>
>
> Hello all,
>
> How am I able to read the value of the User-Password attribute and pass it to a variable from an (AuthBy) EXTERNAL BASH script? Also, how am I able to send back the result to the user eith
er successful (Access-Accept) or failed (Access-Reject)?
>
> Below is a snippet of my Radiator configuration:
>
> - - - < s n i p > - - -
> <Realm DEFAULT>
> <AuthBy EXTERNAL>
> DecryptPassword
> Command /usr/local/sbin/testauth.sh
> Fork
> RejectEmptyPassword
> </AuthBy>
> AcctLogFileName %L/accounting/detail-%Y%m%d.log
> </Realm>
> - - - < s n i p > - - -
>
> Below is my BASH script:
>
> - - - < s n
> i p > - - -
> #!/bin/bash
> USERNAME=$(grep -i User-Name | awk -F'61|@' '{print $2}')
> PASSWORD=$(grep -i User-Password | awk -F'= ' '{print $2}')
> HOST=192.168.1.101
> HTTP_PORT=80
> URL="http://$HOST/credentials.php?command=password_retrieve&phonenumber=$USERNAME"
> RETVAL=0
> set -x
> function die()
&
gt; {
> echo -e "$@" >> /var/log/messages
> exit 1
> }
> if echo "" | telnet $HOST $HTTP_PORT 2>&1 | grep -i Connected ; then
> if [ $PASSWORD == $(wget -c -O - $URL | cut -d\| -f 1) ] ; then
> # Make an Access-Accept reply to the user.
> else
> # Make an Access-Reject reply to the user.
> fi
> else
> die "ERROR: The $HOST is dow
> n or unreachable on $(date)."
> fi
> exit ${RETVAL}
> - - - < s n i p > - - -
>
> Lastly, I am getting the below line in my radiusd.log file:
>
> Tue Jun 28 13:53:01 2011 476732: ERR: Bad attribute=value pair: Connected to 192.168.1.201.
>
> Please advice. Thank you in advance.
>
> Regards,
>
> MP
> From: antmtp at hotmail.com
> To: radiator at open.com.au
> Date: Wed, 22 Jun 2011 13:50:30 +0800
> Subject: Re: [RAD
IATOR] Executing an external script from Radiator
>
>
>
>
>
>
>
>
> Hello all,
>
> Thank you for all who responded to my e-mail.
>
> Now, I have a problem though. First, I am just going to write the script in BASH as I don't know Perl. Second, there is no database here to verify the User-Name and User-Password. Everytime there is an Access-Request that is received by the Radiator, it should execute the BASH script to (maybe) wget or curl with an input parameter of the User-Name from an HTTP or HTTPS URL and will receive the output with the User-Name and User-Password to verify and then reply back with an Access-Accept. If during the wget or curl from the URL and the output is other than what I expect (the User-Name and User-Password), then Radiator should respond with an Access-Reject.
>
> [NAS Client] <---> (RADIUS TRaffic) <---> [Radiator] <---> (Execut
e Script) <---> (HTTP/HTTPS Traffic) <---> [HTTP Server]
>
> Please ad
> vice. Thank you in advance.
>
> From: antmtp at hotmail.com
> To: radiator at open.com.au
> Date: Tue, 21 Jun 2011 14:34:37 +0800
> Subject: [RADIATOR] Executing an external script from Radiator
>
>
>
>
>
>
>
>
>
>
>
> Hello all,
>
> How am I going to execute an external script when Radiator receives an Access-Request? This script will actually do an HTTP API request from an external HTTP server to get the userid then once the script have it on the same server as where the Radiator is running, Radiator will now respond an Access-Accept.
>
> Please advice. Thank you in advance.
>
>
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>
>
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--
Martin Burton
Seni
or Systems Administrator \\\|||///
Special Projects Team \\ ^ ^ //
Wellcome Trust Sanger Institute ( 6 6 )
-----------------------------------------oOOo-(_)-oOOo---
t: +44 (0)1223 496945 http://www.sanger.ac.uk
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