automation, configuration, scripting, Uncategorized, wireless topics

Perl script for bulk update of radius server settings on Cisco WLCs

The task, which one may encounter, is to update radius authentication or accounting server settings on Cisco local wireless controllers (WLC) due to either IP of  radius authentication or accounting server is changed (e.g. old servers were scrapped, new ones deployed) or shared secret is changed or should be updated due to other reasons. Shown below script can do such tasks for Cisco WLCs as in my case such changes had to be done on ~60 local WLCs (with manual work such change would be quite stressful, prone to errors and took quite a lot of time).

Initial data and assumptions are:

1) per Cisco WLCs command line, there are no command options to reset shared secret for radius authentication or accounting server:

config radius acct

Pic.1 – Command line options of radius server on Cisco WLC command line

So if someone needs to update shared secret for radius authentication or accounting server, per Cisco’s design it is needed to delete related radius from WLC’s config and then to add it with new password (similar procedure if it is the case of changed IP of radius authentication or accounting server).

2) script below is using Net::SSH::Expect package. If someone uses Debian Linux or its derivatives, I would recommend to install such Perl package as .deb package (I will create separate topic about that), as CPAN or other ways of installation Perl modules sometimes hadn’t worked per my experience.

3) IP addresses of all WLCs, which should go through the change of radius authentication/accounting server, are stored in a separate text file (one IP per one line) which is passed as an argument to the script. For example, if presented script in your case is called “change_wlc_ALL_rad_acc_settings1_0_0.pl” then command to run the script will look following way (in such case file with WLCs IPs is “all_WLCs.txt” is located in the same folder with the script):

command line

Pic.2 – Example of running the provided script

4) script will automatically search defined by you SSIDs which are utilizing related radius authentication or accounting server. For this example script expects that such SSID names contain ABC, KLM, XYZ strings for identification them by regex.

5) “your_username” and “your_password” to authorise on WLCs should be replaced by yours

6) per Cisco’s design, to delete related radius authentication or accounting server it is firstly needed to disable all related SSIDs, which are using it, and delete related radius server from setting of such SSIDs. Script below expects that SSIDs “ABC”, “KLM” and  “XYZ” are using related radius server, so script will search these IDs of such SSIDs to remove related radius server from their settings.

7) script expects that radius accounting server in such example has IP 10.20.30.40 and will search it via regex to identify its ID for further changes with WLC’s  commands

8) script assumes that radius accounting ID on Cisco WLC should be 17 and it is using “acc_shared_secret” shared secret

9) to document all logging output (forchecking that all is executed as expected), tee command can be used, e.g.

@debian:~/scripts# ./change_wlc_ALL_rad_acc_settings1_0_0.pl all_WLCs.txt | tee /tmp/log_changes.log

this will save all output to /tmp/log_changes.log (and will show on console as well)

10) in script there are no correct mechanism to catch error due to unavailability of a certain WLC in a list, where it tries to establish SSH, or authentication problem to access SSH. In these two cases scrip will finish itself with error (such drawback to be improved)

Script itself is following :

#!/usr/bin/perl
#script to update radius acc servers on local WLCs


use Net::SSH::Expect;

my $filename = $ARGV[0];

if (open(my $fh, '<:encoding(UTF-8)', $filename)) {
while ( <$fh> ) {
chomp;
@fields = split(' ', $_);

my $ssh = Net::SSH::Expect->new (
host => $host1,
raw_pty => 1
);
print ("Getting into WLC $host1...n");
$ssh->run_ssh() or print "SSH process couldn't start: $!";
$ssh->waitfor('Are you sure you want to continue connecting (yes/no)?', 10) or print "n key already imported n";
$ssh->send("yesn");
$ssh->waitfor('User:', 20) or die "prompt 'User' not found after 20 second";
$ssh->send(" ");
$ssh->send("your_username");
$ssh->waitfor('Password:', 7) or print "prompt 'Password' not found after 7 second";
$ssh->send("your_password");
$ssh->waitfor('(Cisco Controller)', 7) or print "prompt 'Cisco Controller' not found";
print ($ssh->exec("config paging disable"));

#------search and identify WLAN ID of ABC------#
print ("Checking ABC WLAN id numbern");
$ssh_session =$ssh->exec("show wlan summary");
print ($$ssh_session);

#cutting line with related WLAN information:
($matching) = $ssh_session=~ /([^n]*ABC+)/is;
print ("n$matching");

my $ABC_wlan_id;
$matching =~ m/(d+)/g;
if ($matching ne "") {

$ABC_wlan_id=$1;
}
else {
$ABC_wlan_id=0;
}

print ("nn print ABC id= $ABC_wlan_id n");

#--search and identify WLAN ID of KLM--#

print ("Checking KLM WLAN id numbern");
$ssh_session =$ssh->exec("show wlan summary");
print ($$ssh_session);

#cutting line with related WLAN information:
($matching) = $ssh_session=~ /([^n]*KLM+)/is;
print ("n$matching");

my $KLM_wlan_id;
$matching =~ m/(d+)/g;
if ($matching ne "") {

$KLM_wlan_id=$1;
}
else {
$KLM_wlan_id=0;

}

print ("nn print KLM id= $KLM_wlan_id n");

#---search and identify WLAN ID of XYZ---#

print ("Checking XYZ WLAN id numbern");
#print ($ssh->exec("show wlan summary"));
$ssh_session =$ssh->exec("show wlan summary");
print ($$ssh_session);

#cutting line with related WLAN information:

($matching) = $ssh_session=~ /([^n]*XYZ+)/is;
print ("n$matching");

my $XYZ_wlan_id;
$matching =~ m/(d+)/g;
if ($matching ne "") {

#print ("n matching parameter= $matchingn");
$XYZ_wlan_id=$1;

}
else {
$XYZ_wlan_id=0;
}

print ("nn print XYZ id= $XYZ_wlan_id n");

#---------acc radius part----------#

$ssh_session =$ssh->exec("show radius summary");
print ($$ssh_session);
($matching) = $ssh_session=~ /([^n]*10.20.30.40+)/is;
print ("n$matching");
$matching =~ m/(d+)/g;
my $rad_id100;
if ($matching ne "") {
$rad_id100=$1;
}
else {
$rad_id100=0
}
print ("nn radius accounting id= $rad_id100 n");

#---apply related commands for changes---#
print("n disabling mentioned WLAN ABC");
print ($ssh->exec("config wlan disable $ABC_wlan_idn"));

print("n disabling mentioned WLAN KLM ");
print ($ssh->exec("config wlan disable $KLM _wlan_idn"));

print("n disabling mentioned WLAN XYZ ");
print ($ssh->exec("config wlan disable $XYZ _wlan_idn"));

print("n deleting acc radius server under ABC, SSID ID= $ABC_wlan_idn");
print ($ssh->exec("config wlan radius_server acct delete $ABC_wlan_id all"));
print("n deleting acc radius server under KLM, SSID ID= $KLM_wlan_idn");
print ($ssh->exec("config wlan radius_server acct delete $KLM_wlan_id all"));
print("n deleting acc radius server under XYZ, SSID ID= $XYZ_wlan_idn");
print ($ssh->exec("config wlan radius_server acct delete $XYZ_wlan_id all"));
print ("n radius acc ID is $rad_id100 n");
print("n deleting acc radius server under radius settings on WLC n");
print ($ssh->exec("config radius acc delete $rad_id100"));

# create radius acc server and enable WLANs

print("n adding acc radius server (with id=17) under radius settings on WLC n");
print ($ssh->exec("config radius acct add 17 10.20.30.40 1813 ascii acc_shared_secret"));
print ($ssh->exec("config radius acct network 17 enable"));
print ($ssh->exec("config radius acct disable 17"));
print ($ssh->exec("config radius acct retransmit-timeout 17 5"));
print ($ssh->exec("config radius acct enable 17"));

print("n adding acc radius server under ABC, SSID ID= $ABC_wlan_id n");
print ($ssh->exec("config wlan radius_server acct add $ABC_wlan_id 17"));
print ($ssh->exec("config wlan enable $ABC_wlan_id"));

print("n adding acc radius server under KLM, SSID ID= $KLM_wlan_id n");
print ($ssh->exec("config wlan radius_server acct add $KLM_wlan_id 17"));
print ($ssh->exec("config wlan enable $KLM_wlan_id"));

print("n adding acc radius server under XYZ, SSID ID= $XYZ_wlan_id n");
print ($ssh->exec("config wlan radius_server acct add $XYZ_wlan_id 17"));
print ($ssh->exec("config wlan enable $XYZ_wlan_id"));
print("n saving configuration file to flash memory n");
print ($ssh->exec("save config"));
print ($ssh->exec("y"));

}
} else {
warn "Could not open file '$filename' $!";
}