test SSL MitM attack

verify that --ssl-verify-server-cert detects cert mismatch,
but with --disable-ssl-verify-server-cert the connection succeeds

mysql-test/lib/ssl-mitm.pl

@@ -0,0 +1,95 @@
+#!/usr/bin/env perl
+
+# mitm for mariadb procotol with ssl
+
+use strict;
+use warnings;
+use autodie;
+use Getopt::Long;
+use Socket qw(PF_INET SOCK_STREAM INADDR_ANY INADDR_LOOPBACK sockaddr_in SO_REUSEADDR SOL_SOCKET);
+use Net::SSLeay;
+
+my $opt_listen_port;
+my $opt_connect_port;
+my $opt_key;
+my $opt_cert;
+my $opt_ca;
+
+my %options=(
+  'listen-on=i' => \$opt_listen_port,
+  'connect-to=i' => \$opt_connect_port,
+  'ssl-key=s' => \$opt_key,
+  'ssl-cert=s' => \$opt_cert,
+  'ssl-ca=s' => \$opt_ca,
+);
+
+GetOptions(%options) or usage("Can't read options");
+die "not all options set" unless $opt_listen_port and $opt_connect_port
+                             and $opt_key and $opt_cert and $opt_ca;
+
+Net::SSLeay::load_error_strings();
+Net::SSLeay::SSLeay_add_ssl_algorithms();
+
+my $servctx = Net::SSLeay::CTX_new();
+my $servssl = Net::SSLeay::new($servctx);
+
+my $clictx = Net::SSLeay::CTX_new();
+Net::SSLeay::CTX_load_verify_locations($clictx, $opt_ca, '');
+Net::SSLeay::set_cert_and_key($clictx, $opt_cert, $opt_key);
+my $clissl = Net::SSLeay::new($clictx);
+
+socket(my $listen, PF_INET, SOCK_STREAM, getprotobyname('tcp'));
+setsockopt($listen, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
+bind($listen, sockaddr_in($opt_listen_port, INADDR_ANY));
+listen($listen, 1);
+warn "$$: listening";
+
+print ">> MitM active <<\n";
+close STDOUT;
+
+fork and exit;
+warn "$$: forked";
+
+accept(my $client, $listen);
+warn "$$: accepted";
+
+socket(my $server, PF_INET, SOCK_STREAM, getprotobyname('tcp'));
+connect($server, sockaddr_in($opt_connect_port, INADDR_LOOPBACK));
+warn "$$: connected";
+
+# handshake server -> client
+recv $server, $_, 1e6, 0;
+send $client, $_, 0;
+warn "$$: handshake server -> client (".length.")";
+
+# client replies with a dummy
+recv $client, $_, 36, 0;
+send $server, $_, 0;
+warn "$$: client replies with a dummy (".length.")";
+
+# SSL with server
+Net::SSLeay::set_fd($servssl, fileno($server));
+Net::SSLeay::connect($servssl);
+warn "$$: ssl connect server";
+
+# SSL accept client
+Net::SSLeay::set_fd($clissl, fileno($client));
+Net::SSLeay::accept($clissl);
+warn "$$: ssl accept client";
+
+while (1) {
+  $_=Net::SSLeay::read($clissl) or last;
+  warn "$$: ssl read client ".length.")";
+  s/Detecting MitM/No MitM found!/;
+  Net::SSLeay::write($servssl, $_) or last;
+  warn "$$: ssl write server ".length.")";
+  $_=Net::SSLeay::read($servssl) or last;
+  warn "$$: ssl read server ".length.")";
+  Net::SSLeay::write($clissl, $_) or last;
+  warn "$$: ssl write client ".length.")";
+}
+
+close($server);
+close($client);
+close($listen);
+warn "$$: ----------\n";

mysql-test/main/ssl_autoverify,win.rdiff

@@ -12,3 +12,20 @@
  # mysql -unative -pfoo --ssl-verify-server-cert -e "select test.have_ssl()"
  test.have_ssl()
  yes
+@@ -38,16 +38,6 @@
+ # mysql -umulti -ppw2 --ssl-verify-server-cert -e "select test.have_ssl()"
+ test.have_ssl()
+ yes
+->> MitM active <<
+-# mysql -uroot --disable-ssl-verify-server-cert -e "select 'Detecting MitM' as MitM, test.have_ssl()"
+-MitM	test.have_ssl()
+-No MitM found!	yes
+->> MitM active <<
+-# mysql -unative -pfoo --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+-ERROR 2026 (HY000): TLS/SSL error: Failed to verify the server certificate
+->> MitM active <<
+-# mysql -ued -pbar --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+-ERROR 2026 (HY000): TLS/SSL error: Failed to verify the server certificate
+ drop function have_ssl;
+ drop user native@'%';
+ drop user ed@'%';

mysql-test/main/ssl_autoverify.result

@@ -38,6 +38,16 @@ yes
 # mysql -umulti -ppw2 --ssl-verify-server-cert -e "select test.have_ssl()"
 test.have_ssl()
 yes
+>> MitM active <<
+# mysql -uroot --disable-ssl-verify-server-cert -e "select 'Detecting MitM' as MitM, test.have_ssl()"
+MitM	test.have_ssl()
+No MitM found!	yes
+>> MitM active <<
+# mysql -unative -pfoo --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+ERROR 2026 (HY000): TLS/SSL error: Failed to verify the server certificate
+>> MitM active <<
+# mysql -ued -pbar --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+ERROR 2026 (HY000): TLS/SSL error: Failed to verify the server certificate
 drop function have_ssl;
 drop user native@'%';
 drop user ed@'%';

mysql-test/main/ssl_autoverify.test

@@ -75,6 +75,29 @@ if ($MTR_COMBINATION_WIN) {
 --echo # mysql -umulti -ppw2 --ssl-verify-server-cert -e "select test.have_ssl()"
 --exec $MYSQL --protocol tcp -umulti -ppw2 --ssl-verify-server-cert -e "select test.have_ssl()" 2>&1
 
+#
+# Now try MitM
+#
+if (!$MTR_COMBINATION_WIN) {
+let mitm_port=$MASTER_MYPORT;
+inc $mitm_port;
+--exec perl lib/ssl-mitm.pl --listen-on $mitm_port --connect-to $MASTER_MYPORT --ssl-ca std_data/cacert.pem --ssl-key std_data/server-new-key.pem --ssl-cert std_data/server-new-cert.pem
+--echo # mysql -uroot --disable-ssl-verify-server-cert -e "select 'Detecting MitM' as MitM, test.have_ssl()"
+--exec $MYSQL --port $mitm_port --disable-ssl-verify-server-cert -uroot -e "select 'Detecting MitM' as MitM, test.have_ssl()" 2>&1
+
+--exec perl lib/ssl-mitm.pl --listen-on $mitm_port --connect-to $MASTER_MYPORT --ssl-ca std_data/cacert.pem --ssl-key std_data/server-new-key.pem --ssl-cert std_data/server-new-cert.pem
+--echo # mysql -unative -pfoo --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+--replace_regex /TLS\/SSL error.*certificate[^\n]*/TLS\/SSL error: Failed to verify the server certificate/
+--error 1
+--exec $MYSQL --port $mitm_port -unative -pfoo --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()" 2>&1
+
+--exec perl lib/ssl-mitm.pl --listen-on $mitm_port --connect-to $MASTER_MYPORT --ssl-ca std_data/cacert.pem --ssl-key std_data/server-new-key.pem --ssl-cert std_data/server-new-cert.pem
+--echo # mysql -ued -pbar --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()"
+--replace_regex /TLS\/SSL error.*certificate[^\n]*/TLS\/SSL error: Failed to verify the server certificate/
+--error 1
+--exec $MYSQL --port $mitm_port -ued -pbar --ssl-verify-server-cert -e "select 'Detecting MitM', test.have_ssl()" 2>&1
+}
+
 drop function have_ssl;
 drop user native@'%';
 drop user ed@'%';