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ha: Perform child rekeying outside of CHILD_SA enumerator

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When rekey_child_sa is called while enumerating the children of an IKE_SA, and
the child to be rekeyed is redundant a QUICK_DELETE task is queued instead of a
QUICK_MODE task. This alters the IKE_SA's list of children (ike_sa_t::child_sas)
invalidating the current element of the child_sa_enumerator. The enumerate
function of linked_list_t will then advance to an element with unpredictable
contents most likely resulting in an segmentation violation. A similar behavior
should be observed when delete_child_sa is called.

This patch creates a list of protocol/spi values while holding the
child_sa_enumerator and performs the rekeying (deletion of redundant) chlidren
after releasing the enumerator.

Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
This commit is contained in:
Thomas Egerer
2015-02-19 10:58:40 +01:00
committed by Martin Willi
parent 5cc0b23886
commit 875f7be5fc
1 changed files with 22 additions and 7 deletions
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src/libcharon/plugins/ha/ha_cache.c
+22 -7
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@@ -196,9 +196,26 @@ static status_t rekey_children(ike_sa_t *ike_sa)
enumerator_t *enumerator;
child_sa_t *child_sa;
status_t status = SUCCESS;
linked_list_t *children;
struct {
protocol_id_t protocol;
u_int32_t spi;
} *info;
children = linked_list_create();
enumerator = ike_sa->create_child_sa_enumerator(ike_sa);
while (enumerator->enumerate(enumerator, (void**)&child_sa))
while (enumerator->enumerate(enumerator, &child_sa))
{
INIT(info,
.protocol = child_sa->get_protocol(child_sa),
.spi = child_sa->get_spi(child_sa, TRUE),
);
children->insert_last(children, info);
}
enumerator->destroy(enumerator);
enumerator = children->create_enumerator(children);
while (enumerator->enumerate(enumerator, &info))
{
if (ike_sa->supports_extension(ike_sa, EXT_MS_WINDOWS) &&
ike_sa->has_condition(ike_sa, COND_NAT_THERE))
@@ -207,17 +224,13 @@ static status_t rekey_children(ike_sa_t *ike_sa)
* with an "invalid situation" error. We just close the CHILD_SA,
* Windows will reestablish it immediately if required. */
DBG1(DBG_CFG, "resyncing CHILD_SA using a delete");
status = ike_sa->delete_child_sa(ike_sa,
child_sa->get_protocol(child_sa),
child_sa->get_spi(child_sa, TRUE),
status = ike_sa->delete_child_sa(ike_sa, info->protocol, info->spi,
FALSE);
}
else
{
DBG1(DBG_CFG, "resyncing CHILD_SA using a rekey");
status = ike_sa->rekey_child_sa(ike_sa,
child_sa->get_protocol(child_sa),
child_sa->get_spi(child_sa, TRUE));
status = ike_sa->rekey_child_sa(ike_sa, info->protocol, info->spi);
}
if (status == DESTROY_ME)
{
@@ -225,6 +238,8 @@ static status_t rekey_children(ike_sa_t *ike_sa)
}
}
enumerator->destroy(enumerator);
children->destroy_function(children, free);
return status;
}