491 lines
21 KiB
Perl
491 lines
21 KiB
Perl
package C4::Auth_with_ldap;
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# Copyright 2000-2002 Katipo Communications
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with Koha; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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use strict;
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# use warnings; almost?
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use Digest::MD5 qw(md5_base64);
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use C4::Debug;
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use C4::Context;
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use C4::Members qw(AddMember changepassword);
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use C4::Members::Attributes;
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use C4::Members::AttributeTypes;
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use C4::Utils qw( :all );
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use List::MoreUtils qw( any );
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use Net::LDAP;
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use Net::LDAP::Filter;
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $debug);
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BEGIN {
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require Exporter;
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$VERSION = 3.10; # set the version for version checking
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@ISA = qw(Exporter);
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@EXPORT = qw( checkpw_ldap );
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}
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# Redefine checkpw_ldap:
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# connect to LDAP (named or anonymous)
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# ~ retrieves $userid from KOHA_CONF mapping
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# ~ then compares $password with userPassword
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# ~ then gets the LDAP entry
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# ~ and calls the memberadd if necessary
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sub ldapserver_error ($) {
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return sprintf('No ldapserver "%s" defined in KOHA_CONF: ' . $ENV{KOHA_CONF}, shift);
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}
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use vars qw($mapping @ldaphosts $base $ldapname $ldappassword);
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my $context = C4::Context->new() or die 'C4::Context->new failed';
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my $ldap = C4::Context->config("ldapserver") or die 'No "ldapserver" in server hash from KOHA_CONF: ' . $ENV{KOHA_CONF};
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my $prefhost = $ldap->{hostname} or die ldapserver_error('hostname');
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my $base = $ldap->{base} or die ldapserver_error('base');
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$ldapname = $ldap->{user} ;
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$ldappassword = $ldap->{pass} ;
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our %mapping = %{$ldap->{mapping}} || (); # or die ldapserver_error('mapping');
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my @mapkeys = keys %mapping;
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$debug and print STDERR "Got ", scalar(@mapkeys), " ldap mapkeys ( total ): ", join ' ', @mapkeys, "\n";
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@mapkeys = grep {defined $mapping{$_}->{is}} @mapkeys;
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$debug and print STDERR "Got ", scalar(@mapkeys), " ldap mapkeys (populated): ", join ' ', @mapkeys, "\n";
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my %config = (
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anonymous => ($ldapname and $ldappassword) ? 0 : 1,
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replicate => defined($ldap->{replicate}) ? $ldap->{replicate} : 1, # add from LDAP to Koha database for new user
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update => defined($ldap->{update} ) ? $ldap->{update} : 1, # update from LDAP to Koha database for existing user
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);
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sub description ($) {
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my $result = shift or return undef;
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return "LDAP error #" . $result->code
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. ": " . $result->error_name . "\n"
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. "# " . $result->error_text . "\n";
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}
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sub search_method {
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my $db = shift or return;
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my $userid = shift or return;
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my $uid_field = $mapping{userid}->{is} or die ldapserver_error("mapping for 'userid'");
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my $filter = Net::LDAP::Filter->new("$uid_field=$userid") or die "Failed to create new Net::LDAP::Filter";
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my $res = ($config{anonymous}) ? $db->bind : $db->bind($ldapname, password=>$ldappassword);
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if ($res->code) { # connection refused
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warn "LDAP bind failed as ldapuser " . ($ldapname || '[ANONYMOUS]') . ": " . description($res);
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return 0;
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}
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my $search = $db->search(
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base => $base,
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filter => $filter,
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# attrs => ['*'],
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) or die "LDAP search failed to return object.";
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my $count = $search->count;
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if ($search->code > 0) {
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warn sprintf("LDAP Auth rejected : %s gets %d hits\n", $filter->as_string, $count) . description($search);
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return 0;
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}
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if ($count != 1) {
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warn sprintf("LDAP Auth rejected : %s gets %d hits\n", $filter->as_string, $count);
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return 0;
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}
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return $search;
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}
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sub checkpw_ldap {
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my ($dbh, $userid, $password) = @_;
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my @hosts = split(',', $prefhost);
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my $db = Net::LDAP->new(\@hosts);
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#$debug and $db->debug(5);
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my $userldapentry;
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if ( $ldap->{auth_by_bind} ) {
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my $principal_name = $ldap->{principal_name};
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if ($principal_name and $principal_name =~ /\%/) {
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$principal_name = sprintf($principal_name,$userid);
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} else {
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$principal_name = $userid;
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}
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my $res = $db->bind( $principal_name, password => $password );
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if ( $res->code ) {
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$debug and warn "LDAP bind failed as kohauser $principal_name: ". description($res);
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return 0;
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}
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} else {
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my $search = search_method($db, $userid) or return 0; # warnings are in the sub
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$userldapentry = $search->shift_entry;
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my $cmpmesg = $db->compare( $userldapentry, attr=>'userpassword', value => $password );
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if ($cmpmesg->code != 6) {
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warn "LDAP Auth rejected : invalid password for user '$userid'. " . description($cmpmesg);
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return 0;
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}
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}
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# To get here, LDAP has accepted our user's login attempt.
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# But we still have work to do. See perldoc below for detailed breakdown.
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my (%borrower);
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my ($borrowernumber,$cardnumber,$local_userid,$savedpw) = exists_local($userid);
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if (( $borrowernumber and $config{update} ) or
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(!$borrowernumber and $config{replicate}) ) {
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%borrower = ldap_entry_2_hash($userldapentry,$userid);
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$debug and print STDERR "checkpw_ldap received \%borrower w/ " . keys(%borrower), " keys: ", join(' ', keys %borrower), "\n";
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}
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if ($borrowernumber) {
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if ($config{update}) { # A1, B1
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my $c2 = &update_local($local_userid,$password,$borrowernumber,\%borrower) || '';
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($cardnumber eq $c2) or warn "update_local returned cardnumber '$c2' instead of '$cardnumber'";
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} else { # C1, D1
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# maybe update just the password?
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}
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} elsif ($config{replicate}) { # A2, C2
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$borrowernumber = AddMember(%borrower) or die "AddMember failed";
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} else {
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return 0; # B2, D2
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}
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if (C4::Context->preference('ExtendedPatronAttributes') && $borrowernumber && ($config{update} ||$config{replicate})) {
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my @types = C4::Members::AttributeTypes::GetAttributeTypes();
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my @attributes = grep{my $key=$_; any{$_ eq $key}@types;} keys %borrower;
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my $extended_patron_attributes = map{{code=>$_,value=>$borrower{$_}}}@attributes;
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my @errors;
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#Check before add
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for (my $i; $i< scalar(@$extended_patron_attributes)-1;$i++) {
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my $attr=$extended_patron_attributes->[$i];
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unless (C4::Members::Attributes::CheckUniqueness($attr->{code}, $attr->{value}, $borrowernumber)) {
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unshift @errors, $i;
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warn "ERROR_extended_unique_id_failed $attr->{code} $attr->{value}";
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}
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}
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#Removing erroneous attributes
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foreach my $index (@errors){
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@$extended_patron_attributes=splice(@$extended_patron_attributes,$index,1);
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}
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C4::Members::Attributes::SetBorrowerAttributes($borrowernumber, $extended_patron_attributes);
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}
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return(1, $cardnumber);
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}
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# Pass LDAP entry object and local cardnumber (userid).
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# Returns borrower hash.
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# Edit KOHA_CONF so $memberhash{'xxx'} fits your ldap structure.
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# Ensure that mandatory fields are correctly filled!
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#
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sub ldap_entry_2_hash ($$) {
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my $userldapentry = shift;
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my %borrower = ( cardnumber => shift );
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my %memberhash;
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$userldapentry->exists('uid'); # This is bad, but required! By side-effect, this initializes the attrs hash.
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if ($debug) {
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print STDERR "\nkeys(\%\$userldapentry) = " . join(', ', keys %$userldapentry), "\n", $userldapentry->dump();
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foreach (keys %$userldapentry) {
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print STDERR "\n\nLDAP key: $_\t", sprintf('(%s)', ref $userldapentry->{$_}), "\n";
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hashdump("LDAP key: ",$userldapentry->{$_});
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}
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}
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my $x = $userldapentry->{attrs} or return undef;
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foreach (keys %$x) {
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$memberhash{$_} = join ' ', @{$x->{$_}};
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$debug and print STDERR sprintf("building \$memberhash{%s} = ", $_, join(' ', @{$x->{$_}})), "\n";
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}
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$debug and print STDERR "Finsihed \%memberhash has ", scalar(keys %memberhash), " keys\n",
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"Referencing \%mapping with ", scalar(keys %mapping), " keys\n";
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foreach my $key (keys %mapping) {
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my $data = $memberhash{$mapping{$key}->{is}};
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$debug and printf STDERR "mapping %20s ==> %-20s (%s)\n", $key, $mapping{$key}->{is}, $data;
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unless (defined $data) {
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$data = $mapping{$key}->{content} || ''; # default or failsafe ''
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}
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$borrower{$key} = ($data ne '') ? $data : ' ' ;
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}
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$borrower{initials} = $memberhash{initials} ||
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( substr($borrower{'firstname'},0,1)
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. substr($borrower{ 'surname' },0,1)
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. " ");
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return %borrower;
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}
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sub exists_local($) {
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my $arg = shift;
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my $dbh = C4::Context->dbh;
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my $select = "SELECT borrowernumber,cardnumber,userid,password FROM borrowers ";
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my $sth = $dbh->prepare("$select WHERE userid=?"); # was cardnumber=?
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$sth->execute($arg);
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$debug and printf STDERR "Userid '$arg' exists_local? %s\n", $sth->rows;
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($sth->rows == 1) and return $sth->fetchrow;
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$sth = $dbh->prepare("$select WHERE cardnumber=?");
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$sth->execute($arg);
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$debug and printf STDERR "Cardnumber '$arg' exists_local? %s\n", $sth->rows;
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($sth->rows == 1) and return $sth->fetchrow;
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return 0;
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}
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sub _do_changepassword {
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my ($userid, $borrowerid, $digest) = @_;
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$debug and print STDERR "changing local password for borrowernumber=$borrowerid to '$digest'\n";
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changepassword($userid, $borrowerid, $digest);
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# Confirm changes
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my $sth = C4::Context->dbh->prepare("SELECT password,cardnumber FROM borrowers WHERE borrowernumber=? ");
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$sth->execute($borrowerid);
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if ($sth->rows) {
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my ($md5password, $cardnum) = $sth->fetchrow;
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($digest eq $md5password) and return $cardnum;
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warn "Password mismatch after update to cardnumber=$cardnum (borrowernumber=$borrowerid)";
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return undef;
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}
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die "Unexpected error after password update to userid/borrowernumber: $userid / $borrowerid.";
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}
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sub update_local($$$$) {
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my $userid = shift or return undef;
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my $digest = md5_base64(shift) or return undef;
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my $borrowerid = shift or return undef;
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my $borrower = shift or return undef;
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my @keys = keys %$borrower;
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my $dbh = C4::Context->dbh;
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my $query = "UPDATE borrowers\nSET " .
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join(',', map {"$_=?"} @keys) .
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"\nWHERE borrowernumber=? ";
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my $sth = $dbh->prepare($query);
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if ($debug) {
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print STDERR $query, "\n",
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join "\n", map {"$_ = '" . $borrower->{$_} . "'"} @keys;
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print STDERR "\nuserid = $userid\n";
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}
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$sth->execute(
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((map {$borrower->{$_}} @keys), $borrowerid)
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);
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# MODIFY PASSWORD/LOGIN
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_do_changepassword($userid, $borrowerid, $digest);
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}
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1;
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__END__
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=head1 NAME
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C4::Auth - Authenticates Koha users
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=head1 SYNOPSIS
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use C4::Auth_with_ldap;
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=head1 LDAP Configuration
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This module is specific to LDAP authentification. It requires Net::LDAP package and one or more
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working LDAP servers.
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To use it :
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* Modify ldapserver element in KOHA_CONF
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* Establish field mapping in <mapping> element.
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For example, if your user records are stored according to the inetOrgPerson schema, RFC#2798,
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the username would match the "uid" field, and the password should match the "userpassword" field.
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Make sure that ALL required fields are populated by your LDAP database (and mapped in KOHA_CONF).
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What are the required fields? Well, in mysql you can check the database table "borrowers" like this:
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mysql> show COLUMNS from borrowers;
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+------------------+--------------+------+-----+---------+----------------+
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| Field | Type | Null | Key | Default | Extra |
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+------------------+--------------+------+-----+---------+----------------+
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| borrowernumber | int(11) | NO | PRI | NULL | auto_increment |
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| cardnumber | varchar(16) | YES | UNI | NULL | |
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| surname | mediumtext | NO | | | |
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| firstname | text | YES | | NULL | |
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| title | mediumtext | YES | | NULL | |
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| othernames | mediumtext | YES | | NULL | |
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| initials | text | YES | | NULL | |
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| streetnumber | varchar(10) | YES | | NULL | |
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| streettype | varchar(50) | YES | | NULL | |
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| address | mediumtext | NO | | | |
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| address2 | text | YES | | NULL | |
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| city | mediumtext | NO | | | |
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| zipcode | varchar(25) | YES | | NULL | |
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| email | mediumtext | YES | | NULL | |
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| phone | text | YES | | NULL | |
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| mobile | varchar(50) | YES | | NULL | |
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| fax | mediumtext | YES | | NULL | |
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| emailpro | text | YES | | NULL | |
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| phonepro | text | YES | | NULL | |
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| B_streetnumber | varchar(10) | YES | | NULL | |
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| B_streettype | varchar(50) | YES | | NULL | |
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| B_address | varchar(100) | YES | | NULL | |
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| B_city | mediumtext | YES | | NULL | |
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| B_zipcode | varchar(25) | YES | | NULL | |
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| B_email | text | YES | | NULL | |
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| B_phone | mediumtext | YES | | NULL | |
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| dateofbirth | date | YES | | NULL | |
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| branchcode | varchar(10) | NO | MUL | | |
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| categorycode | varchar(10) | NO | MUL | | |
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| dateenrolled | date | YES | | NULL | |
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| dateexpiry | date | YES | | NULL | |
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| gonenoaddress | tinyint(1) | YES | | NULL | |
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| lost | tinyint(1) | YES | | NULL | |
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| debarred | tinyint(1) | YES | | NULL | |
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| contactname | mediumtext | YES | | NULL | |
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| contactfirstname | text | YES | | NULL | |
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| contacttitle | text | YES | | NULL | |
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| guarantorid | int(11) | YES | | NULL | |
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| borrowernotes | mediumtext | YES | | NULL | |
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| relationship | varchar(100) | YES | | NULL | |
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| ethnicity | varchar(50) | YES | | NULL | |
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| ethnotes | varchar(255) | YES | | NULL | |
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| sex | varchar(1) | YES | | NULL | |
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| password | varchar(30) | YES | | NULL | |
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| flags | int(11) | YES | | NULL | |
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| userid | varchar(30) | YES | MUL | NULL | | # UNIQUE in next release.
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| opacnote | mediumtext | YES | | NULL | |
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| contactnote | varchar(255) | YES | | NULL | |
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| sort1 | varchar(80) | YES | | NULL | |
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| sort2 | varchar(80) | YES | | NULL | |
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+------------------+--------------+------+-----+---------+----------------+
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50 rows in set (0.01 sec)
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Where Null="NO", the field is required.
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=head1 KOHA_CONF and field mapping
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Example XML stanza for LDAP configuration in KOHA_CONF.
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<config>
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...
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<useldapserver>1</useldapserver>
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<!-- LDAP SERVER (optional) -->
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<ldapserver id="ldapserver">
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<hostname>localhost</hostname>
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<base>dc=metavore,dc=com</base>
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<user>cn=Manager,dc=metavore,dc=com</user> <!-- DN, if not anonymous -->
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<pass>metavore</pass> <!-- password, if not anonymous -->
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<replicate>1</replicate> <!-- add new users from LDAP to Koha database -->
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<update>1</update> <!-- update existing users in Koha database -->
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<auth_by_bind>0</auth_by_bind> <!-- set to 1 to authenticate by binding instead of
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password comparison, e.g., to use Active Directory -->
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<principal_name>%s@my_domain.com</principal_name>
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<!-- optional, for auth_by_bind: a printf format to make userPrincipalName from koha userid -->
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<mapping> <!-- match koha SQL field names to your LDAP record field names -->
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<firstname is="givenname" ></firstname>
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<surname is="sn" ></surname>
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<address is="postaladdress" ></address>
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<city is="l" >Athens, OH</city>
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<zipcode is="postalcode" ></zipcode>
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<branchcode is="branch" >MAIN</branchcode>
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<userid is="uid" ></userid>
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<password is="userpassword" ></password>
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<email is="mail" ></email>
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<categorycode is="employeetype" >PT</categorycode>
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<phone is="telephonenumber"></phone>
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</mapping>
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</ldapserver>
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</config>
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The <mapping> subelements establish the relationship between mysql fields and LDAP attributes. The element name
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is the column in mysql, with the "is" characteristic set to the LDAP attribute name. Optionally, any content
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between the element tags is taken as the default value. In this example, the default categorycode is "PT" (for
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patron).
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=head1 CONFIGURATION
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Once a user has been accepted by the LDAP server, there are several possibilities for how Koha will behave, depending on
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your configuration and the presence of a matching Koha user in your local DB:
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LOCAL_USER
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OPTION UPDATE REPLICATE EXISTS? RESULT
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A1 1 1 1 OK : We're updating them anyway.
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A2 1 1 0 OK : We're adding them anyway.
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B1 1 0 1 OK : We update them.
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B2 1 0 0 FAIL: We cannot add new user.
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C1 0 1 1 OK : We do nothing. (maybe should update password?)
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C2 0 1 0 OK : We add the new user.
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D1 0 0 1 OK : We do nothing. (maybe should update password?)
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D2 0 0 0 FAIL: We cannot add new user.
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Note: failure here just means that Koha will fallback to checking the local DB. That is, a given user could login with
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their LDAP password OR their local one. If this is a problem, then you should enable update and supply a mapping for
|
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password. Then the local value will be updated at successful LDAP login and the passwords will be synced.
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If you choose NOT to update local users, the borrowers table will not be affected at all.
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Note that this means that patron passwords may appear to change if LDAP is ever disabled, because
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|
the local table never contained the LDAP values.
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|
|
=head2 auth_by_bind
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Binds as the user instead of retrieving their record. Recommended if update disabled.
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|
|
=head2 principal_name
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Provides an optional sprintf-style format for manipulating the userid before the bind.
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|
Even though the userPrincipalName is one intended target, any uniquely identifying
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|
attribute that the server allows to be used for binding could be used.
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|
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Currently, principal_name only operates when auth_by_bind is enabled.
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|
|
=head2 Active Directory
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|
|
|
The auth_by_bind and principal_name settings are recommended for Active Directory.
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|
|
|
Under default Active Directory rules, we cannot determine the distinguishedName attribute from the Koha userid as reliably as
|
|
we would typically under openldap. Instead of:
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|
|
distinguishedName: CN=barnes.7,DC=my_company,DC=com
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|
|
We might get:
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|
|
distinguishedName: CN=Barnes\, Jim,OU=Test Accounts,OU=User Accounts,DC=my_company,DC=com
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|
|
Matching that would require us to know more info about the account (firstname, surname) and to include punctuation and whitespace
|
|
in Koha userids. But the userPrincipalName should be consistent, something like:
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|
|
userPrincipalName: barnes.7@my_company.com
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|
|
|
Therefore it is often easier to bind to Active Directory with userPrincipalName, effectively the
|
|
canonical email address for that user, or what it would be if email were enabled for them. If Koha userid values
|
|
will match the username portion of the userPrincipalName, and the domain suffix is the same for all users, then use principal_name
|
|
like this:
|
|
<principal_name>%s@core.my_company.com</principal_name>
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|
|
|
The user of the previous example, barnes.7, would then attempt to bind as:
|
|
barnes.7@core.my_company.com
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|
=head1 SEE ALSO
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|
|
|
CGI(3)
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|
|
Net::LDAP()
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|
|
|
XML::Simple()
|
|
|
|
Digest::MD5(3)
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|
|
|
sprintf()
|
|
|
|
=cut
|
|
|
|
# For reference, here's an important difference in the data structure we rely on.
|
|
# ========================================
|
|
# Using attrs instead of {asn}->attributes
|
|
# ========================================
|
|
#
|
|
# LDAP key: ->{ cn} = ARRAY w/ 3 members.
|
|
# LDAP key: ->{ cn}->{ sss} = sss
|
|
# LDAP key: ->{ cn}->{ Steve Smith} = Steve Smith
|
|
# LDAP key: ->{ cn}->{Steve S. Smith} = Steve S. Smith
|
|
#
|
|
# LDAP key: ->{ givenname} = ARRAY w/ 1 members.
|
|
# LDAP key: ->{ givenname}->{Steve} = Steve
|
|
#
|