ldap: server and client certificate support

This adds 4 more options to the ldap authentication method:

verify: boolean
  If enabled, the server certificate must be valid

capath: path to a file or directory
  The CA to use to verify the server certificate. Used only
  if 'verify' is true.

cert: path to a certificate
  Used as client certificate when connecting to a server,
  provided 'secure' is true. Requires 'certkey' to be set.

certkey: path to the certificate's key
  Required only used when 'cert' is used.

diff --git a/PVE/Auth/LDAP.pm b/PVE/Auth/LDAP.pm
index d4e277995bcffb1837c652cc28f02c3998fe909f..310234aa2bac6fed984e2ef43e676189452b1531 100755 (executable)
--- a/PVE/Auth/LDAP.pm
+++ b/PVE/Auth/LDAP.pm
@@ -36,6 +36,28 @@ sub properties {
            optional => 1,
            maxLength => 256,
        },
+       verify => {
+           description => "Verify the server's SSL certificate",
+           type => 'boolean',
+           optional => 1,
+           default => 0,
+       },
+       capath => {
+           description => "Path to the CA certificate store",
+           type => 'string',
+           optional => 1,
+           default => '/etc/ssl/certs',
+       },
+       cert => {
+           description => "Path to the client certificate",
+           type => 'string',
+           optional => 1,
+       },
+       certkey => {
+           description => "Path to the client certificate key",
+           type => 'string',
+           optional => 1,
+       },
     };
 }
 
@@ -51,6 +73,10 @@ sub options {
        default => { optional => 1 },
        comment => { optional => 1 },
        tfa => { optional => 1 },
+       verify => { optional => 1 },
+       capath => { optional => 1 },
+       cert => { optional => 1 },
+       certkey => { optional => 1 },
     };
 }
 
@@ -63,7 +89,27 @@ my $authenticate_user_ldap = sub {
     $server = "[$server]" if Net::IP::ip_is_ipv6($server);
     my $conn_string = "$scheme://${server}:$port";
 
-    my $ldap = Net::LDAP->new($conn_string, verify => 'none') || die "$@\n";
+    my %ldap_args;
+    if ($config->{verify}) {
+       $ldap_args{verify} = 'require';
+       if (defined(my $cert = $config->{cert})) {
+           $ldap_args{clientcert} = $cert;
+       }
+       if (defined(my $key = $config->{certkey})) {
+           $ldap_args{clientkey} = $key;
+       }
+       if (defined(my $capath = $config->{capath})) {
+           if (-d $capath) {
+               $ldap_args{capath} = $capath;
+           } else {
+               $ldap_args{cafile} = $capath;
+           }
+       }
+    } else {
+       $ldap_args{verify} = 'none';
+    }
+
+    my $ldap = Net::LDAP->new($conn_string, %ldap_args) || die "$@\n";
 
     if (my $bind_dn = $config->{bind_dn}) {
        my $bind_pass = PVE::Tools::file_read_firstline("/etc/pve/priv/ldap/${realm}.pw");