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kernel-wfp: Install outbound ALE connect rules for IPsec

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Similar to the inbound rules, the ALE filter processes IP-in-IP packets for
outbound tunnel mode traffic. When using an outbound default-drop policy,
Windows does not allow connection initiation without these explicit rules.
This commit is contained in:
Martin Willi
2014-12-04 11:10:48 +01:00
parent a8142a17cf
commit e1a448314f
1 changed files with 43 additions and 16 deletions
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src/libcharon/plugins/kernel_wfp/kernel_wfp_ipsec.c
+43 -16
View File
@@ -190,10 +190,14 @@ typedef struct {
u_int64_t provider; u_int64_t provider;
/** WFP allocated LUID for SA context */ /** WFP allocated LUID for SA context */
u_int64_t sa_id; u_int64_t sa_id;
/** WFP allocated LUID for tunnel mode IP-IP-v4 filter */ /** WFP allocated LUID for tunnel mode IP-IPv4 inbound filter */
u_int64_t policy_ip_ipv4; u_int64_t ip_ipv4_in;
/** WFP allocated LUID for tunnel mode IP-IPv6 filter */ /** WFP allocated LUID for tunnel mode IP-IPv4 outbound filter */
u_int64_t policy_ip_ipv6; u_int64_t ip_ipv4_out;
/** WFP allocated LUID for tunnel mode IP-IPv6 inbound filter */
u_int64_t ip_ipv6_in;
/** WFP allocated LUID for tunnel mode IP-IPv6 outbound filter */
u_int64_t ip_ipv6_out;
} entry_t; } entry_t;
/** /**
@@ -291,13 +295,21 @@ static void cleanup_policies(private_kernel_wfp_ipsec_t *this, entry_t *entry)
*/ */
static void entry_destroy(private_kernel_wfp_ipsec_t *this, entry_t *entry) static void entry_destroy(private_kernel_wfp_ipsec_t *this, entry_t *entry)
{ {
if (entry->policy_ip_ipv4) if (entry->ip_ipv4_in)
{ {
FwpmFilterDeleteById0(this->handle, entry->policy_ip_ipv4); FwpmFilterDeleteById0(this->handle, entry->ip_ipv4_in);
} }
if (entry->policy_ip_ipv6) if (entry->ip_ipv4_out)
{ {
FwpmFilterDeleteById0(this->handle, entry->policy_ip_ipv6); FwpmFilterDeleteById0(this->handle, entry->ip_ipv4_out);
}
if (entry->ip_ipv6_in)
{
FwpmFilterDeleteById0(this->handle, entry->ip_ipv6_in);
}
if (entry->ip_ipv6_out)
{
FwpmFilterDeleteById0(this->handle, entry->ip_ipv6_out);
} }
if (entry->sa_id) if (entry->sa_id)
{ {
@@ -725,7 +737,7 @@ static bool install_sp(private_kernel_wfp_ipsec_t *this, sp_entry_t *sp,
*/ */
static bool install_ipip_ale(private_kernel_wfp_ipsec_t *this, static bool install_ipip_ale(private_kernel_wfp_ipsec_t *this,
host_t *local, host_t *remote, GUID *context, host_t *local, host_t *remote, GUID *context,
int proto, u_int64_t *filter_id) bool inbound, int proto, u_int64_t *filter_id)
{ {
traffic_selector_t *lts, *rts; traffic_selector_t *lts, *rts;
FWPM_FILTER_CONDITION0 *conds = NULL; FWPM_FILTER_CONDITION0 *conds = NULL;
@@ -739,13 +751,17 @@ static bool install_ipip_ale(private_kernel_wfp_ipsec_t *this,
.action = { .action = {
.type = FWP_ACTION_CALLOUT_TERMINATING, .type = FWP_ACTION_CALLOUT_TERMINATING,
}, },
.flags = FWPM_FILTER_FLAG_HAS_PROVIDER_CONTEXT,
.providerKey = (GUID*)&this->provider.providerKey,
.providerContextKey = *context,
}; };
if (context)
{
filter.flags |= FWPM_FILTER_FLAG_HAS_PROVIDER_CONTEXT;
filter.providerKey = (GUID*)&this->provider.providerKey;
filter.providerContextKey = *context;
}
v6 = local->get_family(local) == AF_INET6; v6 = local->get_family(local) == AF_INET6;
if (!find_callout(TRUE, v6, TRUE, FALSE, TRUE, &filter.layerKey, if (!find_callout(TRUE, v6, inbound, FALSE, TRUE, &filter.layerKey,
&filter.subLayerKey, &filter.action.calloutKey)) &filter.subLayerKey, &filter.action.calloutKey))
{ {
return FALSE; return FALSE;
@@ -773,7 +789,8 @@ static bool install_ipip_ale(private_kernel_wfp_ipsec_t *this,
free_conditions(conds, count); free_conditions(conds, count);
if (res != ERROR_SUCCESS) if (res != ERROR_SUCCESS)
{ {
DBG1(DBG_KNL, "installing IP-IP ALE WFP filter failed: 0x%08x", res); DBG1(DBG_KNL, "installing IP-IPv%d %s ALE WFP filter failed: 0x%08x",
v6 ? 6 : 4, inbound ? "inbound" : "outbound", res);
return FALSE; return FALSE;
} }
return TRUE; return TRUE;
@@ -847,7 +864,12 @@ static bool install_sps(private_kernel_wfp_ipsec_t *this,
if (has_v4) if (has_v4)
{ {
if (!install_ipip_ale(this, entry->local, entry->remote, context, if (!install_ipip_ale(this, entry->local, entry->remote, context,
IPPROTO_IPIP, &entry->policy_ip_ipv4)) TRUE, IPPROTO_IPIP, &entry->ip_ipv4_in))
{
return FALSE;
}
if (!install_ipip_ale(this, entry->local, entry->remote, NULL,
FALSE, IPPROTO_IPIP, &entry->ip_ipv4_out))
{ {
return FALSE; return FALSE;
} }
@@ -855,7 +877,12 @@ static bool install_sps(private_kernel_wfp_ipsec_t *this,
if (has_v6) if (has_v6)
{ {
if (!install_ipip_ale(this, entry->local, entry->remote, context, if (!install_ipip_ale(this, entry->local, entry->remote, context,
IPPROTO_IPV6, &entry->policy_ip_ipv6)) TRUE, IPPROTO_IPV6, &entry->ip_ipv6_in))
{
return FALSE;
}
if (!install_ipip_ale(this, entry->local, entry->remote, NULL,
FALSE, IPPROTO_IPV6, &entry->ip_ipv6_out))
{ {
return FALSE; return FALSE;
} }