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network: verify proper address family in updates to <host> and <range>

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By specifying parentIndex in a call to virNetworkUpdate(), it was
possible to direct libvirt to add a dhcp range or static host of a
non-matching address family to the <dhcp> element of an <ip>. For
example, given:

 <ip address='192.168.122.1' netmask='255.255.255.0'/>
 <ip family='ipv6' address='2001:db6:ca3:45::1' prefix='64'/>

you could provide a static host entry with an IPv4 address, and
specify that it be added to the 2nd <ip> element (index 1):

  virsh net-update default add ip-dhcp-host --parent-index 1 \
  '<host mac="52:54:00:00:00:01" ip="192.168.122.45"/>'

This would be happily added with no error (and no concern of any
possible future consequences).

This patch checks that any dhcp range or host element being added to a
network ip's <dhcp> subelement has addresses of the same family as the
ip element they are being added to.

This resolves:

  https://bugzilla.redhat.com/show_bug.cgi?id=1184736
This commit is contained in:
Laine Stump 2015-01-19 17:04:01 -05:00
parent 7d69387cd6
commit 6a21bc119e
1 changed files with 17 additions and 0 deletions
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17
src/conf/network_conf.c
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@ -3500,6 +3500,15 @@ virNetworkDefUpdateIPDHCPHost(virNetworkDefPtr def,
&host, partialOkay) < 0)
goto cleanup;
if (!partialOkay &&
VIR_SOCKET_ADDR_FAMILY(&ipdef->address)
!= VIR_SOCKET_ADDR_FAMILY(&host.ip)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("the address family of a host entry IP must match "
"the address family of the dhcp element's parent"));
goto cleanup;
}
if (command == VIR_NETWORK_UPDATE_COMMAND_MODIFY) {
/* search for the entry with this (ip|mac|name),
@ -3637,6 +3646,14 @@ virNetworkDefUpdateIPDHCPRange(virNetworkDefPtr def,
if (virSocketAddrRangeParseXML(def->name, ipdef, ctxt->node, &range) < 0)
goto cleanup;
if (VIR_SOCKET_ADDR_FAMILY(&ipdef->address)
!= VIR_SOCKET_ADDR_FAMILY(&range.start)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("the address family of a dhcp range must match "
"the address family of the dhcp element's parent"));
goto cleanup;
}
/* check if an entry with same name/address/ip already exists */
for (i = 0; i < ipdef->nranges; i++) {
if (virSocketAddrEqual(&range.start, &ipdef->ranges[i].start) &&