tests: exercise NBD server in TLS mode

Add tests that validate it is possible to connect to an NBD server
running TLS mode. Also test mis-matched TLS vs non-TLS connections
correctly fail.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
Message-Id: <20181116155325.22428-7-berrange@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Tested-by: NEric Blake <eblake@redhat.com>
[eblake: rebase to iotests shell cleanups, use ss instead of socat for
port probing, sanitize port number in expected output]
Signed-off-by: NEric Blake <eblake@redhat.com>

tests/qemu-iotests/233

+#!/bin/bash
+#
+# Test NBD TLS certificate / authorization integration
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=berrange@redhat.com
+
+seq=$(basename $0)
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+    nbd_server_stop
+    _cleanup_test_img
+    tls_x509_cleanup
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+. ./common.tls
+. ./common.nbd
+
+_supported_fmt raw qcow2
+_supported_proto file
+# If porting to non-Linux, consider using socat instead of ss in common.nbd
+_supported_os Linux
+_require_command QEMU_NBD
+
+nbd_server_set_tcp_port
+tls_x509_init
+
+echo
+echo "== preparing TLS creds =="
+
+tls_x509_create_root_ca "ca1"
+tls_x509_create_root_ca "ca2"
+tls_x509_create_server "ca1" "server1"
+tls_x509_create_client "ca1" "client1"
+tls_x509_create_client "ca2" "client2"
+
+echo
+echo "== preparing image =="
+_make_test_img 64M
+
+
+echo
+echo "== check TLS client to plain server fails =="
+nbd_server_start_tcp_socket "$TEST_IMG"
+
+$QEMU_IMG info --image-opts \
+    --object tls-creds-x509,dir=${tls_dir}/client1,endpoint=client,id=tls0 \
+    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0 \
+    2>&1 | sed "s/$nbd_tcp_port/PORT/g"
+
+nbd_server_stop
+
+echo
+echo "== check plain client to TLS server fails =="
+
+nbd_server_start_tcp_socket --object tls-creds-x509,dir=${tls_dir}/server1,endpoint=server,id=tls0,verify-peer=yes --tls-creds tls0 "$TEST_IMG"
+
+$QEMU_IMG info nbd://localhost:$nbd_tcp_port 2>&1 | sed "s/$nbd_tcp_port/PORT/g"
+
+echo
+echo "== check TLS works =="
+$QEMU_IMG info --image-opts \
+    --object tls-creds-x509,dir=${tls_dir}/client1,endpoint=client,id=tls0 \
+    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0 \
+    2>&1 | sed "s/$nbd_tcp_port/PORT/g"
+
+echo
+echo "== check TLS with different CA fails =="
+$QEMU_IMG info --image-opts \
+    --object tls-creds-x509,dir=${tls_dir}/client2,endpoint=client,id=tls0 \
+    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0 \
+    2>&1 | sed "s/$nbd_tcp_port/PORT/g"
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/233.out

+QA output created by 233
+
+== preparing TLS creds ==
+Generating a self signed certificate...
+Generating a self signed certificate...
+Generating a signed certificate...
+Generating a signed certificate...
+Generating a signed certificate...
+
+== preparing image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+
+== check TLS client to plain server fails ==
+qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Denied by server for option 5 (starttls)
+server reported: TLS not configured
+
+== check plain client to TLS server fails ==
+qemu-img: Could not open 'nbd://localhost:PORT': TLS negotiation required before option 8 (structured reply)
+server reported: Option 0x8 not permitted before TLS
+
+== check TLS works ==
+image: nbd://127.0.0.1:PORT
+file format: nbd
+virtual size: 64M (67108864 bytes)
+disk size: unavailable
+
+== check TLS with different CA fails ==
+option negotiation failed: Verify failed: No certificate was found.
+qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': The certificate hasn't got a known issuer
+*** done

tests/qemu-iotests/common.nbd

@@ -20,6 +20,7 @@
 #
 
 nbd_unix_socket="${TEST_DIR}/qemu-nbd.sock"
+nbd_tcp_addr="127.0.0.1"
 nbd_pid_file="${TEST_DIR}/qemu-nbd.pid"
 
 function nbd_server_stop()
@@ -62,3 +63,47 @@ function nbd_server_start_unix_socket()
     $QEMU_NBD -v -t -k "$nbd_unix_socket" "$@" &
     nbd_server_wait_for_unix_socket $!
 }
+
+function nbd_server_set_tcp_port()
+{
+    (ss --help) >/dev/null 2>&1 || _notrun "ss utility not found, skipping test"
+
+    for ((port = 10809; port <= 10909; port++))
+    do
+        if ! ss -tln | grep -sqE ":$port\b"; then
+            nbd_tcp_port=$port
+            return
+        fi
+    done
+
+    echo "Cannot find free TCP port for nbd in range 10809-10909"
+    exit 1
+}
+
+function nbd_server_wait_for_tcp_socket()
+{
+    pid=$1
+
+    for ((i = 0; i < 300; i++))
+    do
+        if ss -tln | grep -sqE ":$nbd_tcp_port\b"; then
+            return
+        fi
+        kill -s 0 $pid 2>/dev/null
+        if test $? != 0
+        then
+            echo "qemu-nbd unexpectedly quit"
+            exit 1
+        fi
+        sleep 0.1
+    done
+    echo "Failed in check of TCP socket created by qemu-nbd"
+    exit 1
+}
+
+function nbd_server_start_tcp_socket()
+{
+    nbd_server_stop
+    $QEMU_NBD -v -t -b $nbd_tcp_addr -p $nbd_tcp_port "$@" &
+    nbd_server_wait_for_tcp_socket $!
+}

tests/qemu-iotests/group

@@ -229,3 +229,4 @@
 229 auto quick
 231 auto quick
 232 auto quick
+233 auto quick