85 lines
2.4 KiB
Perl
85 lines
2.4 KiB
Perl
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#!/usr/bin/perl
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use Net::Radius::Dictionary;
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use Net::Radius::Packet;
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use Net::Inet;
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use Net::UDP;
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use warnings;
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use strict;
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use Fcntl;
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# This is a VERY simple RADIUS authentication server which accepts
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# any user whos User-Name and Password match according to the Unix
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# getpwnam() function.
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# NOTE - This server must be run as root on systems with shadow passwords.
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my $secret = "mysecret"; # Shared secret on the term server
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# Function to check name and password. Returns undef if no such user.
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sub check_pass {
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my ($user, $pass) = @_;
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if (my $pwd = (getpwnam($user))[1]) {
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$pwd =~ /^\$.+\$(.+)\$/ or $pwd =~ /^(..)/;
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my $salt = $1;
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if (crypt($pass, $salt) eq $pwd) {
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return 1;
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}
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else {
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return 0;
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}
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}
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else {
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return undef;
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}
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}
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# Parse the RADIUS dictionary file (must have dictionary in current dir)
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my $dict = new Net::Radius::Dictionary "dictionary"
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or die "Couldn't read dictionary: $!";
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# Set up the network socket (must have radius in /etc/services)
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my $s = new Net::UDP { thisservice => "radius" } or die $!;
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$s->bind or die "Couldn't bind: $!";
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$s->fcntl(F_SETFL, $s->fcntl(F_GETFL,0) | O_NONBLOCK)
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or die "Couldn't make socket non-blocking: $!";
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# Loop forever, recieving packets and replying to them
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while (1) {
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my ($rec, $whence);
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# Wait for a packet
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my $nfound = $s->select(1, 0, 1, undef);
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if ($nfound > 0) {
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# Get the data
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$rec = $s->recv(undef, undef, $whence);
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# Unpack it
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my $p = new Net::Radius::Packet $dict, $rec;
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if ($p->code eq 'Access-Request') {
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# Print some details about the incoming request (try ->dump here)
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print $p->attr('User-Name'), " attempting login with password ",
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$p->password($secret), "\n";
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# Initialize the response packet we'll send back
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my $rp = new Net::Radius::Packet $dict;
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$rp->set_identifier($p->identifier);
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$rp->set_authenticator($p->authenticator);
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# Check against the Unix passwd file
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if (check_pass($p->attr('User-Name'), $p->password($secret))) {
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print "Login valid.\n";
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$rp->set_code('Access-Accept');
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}
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else {
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print "Invalid login.\n";
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$rp->set_code('Access-Reject');
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$rp->set_attr('Reply-Message', "\r\nInvalid login.\r\n");
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}
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# Authenticate with the secret and send to the server.
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$s->sendto(auth_resp($rp->pack, $secret), $whence);
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}
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else {
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# It's not an Access-Request
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print "Unexpected packet type recieved.";
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$p->dump;
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}
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}
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}
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