Forbid use of ':' in RBD pool names

The QEMU command line syntax for RBD disks is

   file=rbd:pool/image:opt1=val1:opt2=val2...

There is no way to escape the ':' if it appears in the
pool or image name. Thus it must be explicitly forbidden
if it occurs in the libvirt XML. People are known to
be abusing the lack of escaping in current libvirt to
pass arbitrary args to QEMU.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/qemu/qemu_command.c

@@ -2383,6 +2383,13 @@ qemuBuildRBDString(virConnectPtr conn,
     char *secret = NULL;
     size_t secret_size;
 
+    if (strchr(disk->src, ':')) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("':' not allowed in RBD source volume name '%s'"),
+                       disk->src);
+        return -1;
+    }
+
     virBufferEscape(opt, ',', ",", "rbd:%s", disk->src);
     if (disk->auth.username) {
         virBufferEscape(opt, '\\', ":", ":id=%s", disk->auth.username);

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-invalid.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <disk type='network' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source protocol='rbd' name='poolname/imagename:rbd_cache=1:rbd_cache_size=67108864:rbd_cache_max_dirty=0'>
+        <host name='mon1.example.org' port='6321'/>
+        <host name='mon2.example.org' port='6322'/>
+        <host name='mon3.example.org' port='6322'/>
+      </source>
+      <target dev='vda' bus='virtio'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -160,6 +160,9 @@ static int testCompareXMLToArgvFiles(const char *xml,
                                      VIR_NETDEV_VPORT_PROFILE_OP_NO_OP))) {
         if (flags & FLAG_EXPECT_FAILURE) {
             ret = 0;
+            if (virTestGetDebug() > 1)
+                fprintf(stderr, "Got expected error: %s\n",
+                        virGetLastErrorMessage());
             virResetLastError();
         }
         goto out;
@@ -528,6 +531,8 @@ mymain(void)
             QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_FORMAT);
     DO_TEST("disk-drive-network-rbd-ipv6",
             QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_FORMAT);
+    DO_TEST_FAILURE("disk-drive-network-rbd-invalid",
+                    QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_FORMAT);
     DO_TEST("disk-drive-no-boot",
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_BOOTINDEX);
     DO_TEST("disk-usb",  NONE);