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eap: Rework handle_response logic

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Expanded packets with a 0 vendor id need to be treated just like
non-expanded ones.  This led to very nasty looking if statements
throughout this function.  Fix that by introducing a nested function
to take care of the response type normalization.  This also allows us to
drop uninitialized_var usage.
This commit is contained in:
Denis Kenzior 2021-03-10 11:35:33 -06:00
parent a483ec7b68
commit 07eea03cca
1 changed files with 30 additions and 23 deletions
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53
src/eap.c
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@ -386,18 +386,29 @@ static const char *eap_type_to_str(enum eap_type type, uint32_t vendor_id,
return buf;
}
#define IS_EXPANDED_RESPONSE(id, t) \
(type == EAP_TYPE_EXPANDED && vendor_id == (id) && vendor_type == (t))
static void eap_handle_response(struct eap_state *eap, const uint8_t *pkt,
size_t len)
{
enum eap_type type;
uint32_t vendor_id;
uint32_t uninitialized_var(vendor_type);
uint32_t vendor_type;
enum eap_type our_type = eap->method->request_type;
uint32_t our_vendor_id = (eap->method->vendor_id[0] << 16) |
(eap->method->vendor_id[1] << 8) |
eap->method->vendor_id[2];
uint32_t our_vendor_type = eap->method->vendor_type;
bool response_is(enum eap_type wanted)
{
if (type == wanted)
return true;
return IS_EXPANDED_RESPONSE(0, wanted);
}
if (len < 1)
/* Invalid packets to be ignored */
return;
@ -423,9 +434,7 @@ static void eap_handle_response(struct eap_state *eap, const uint8_t *pkt,
return;
}
if (type == EAP_TYPE_NAK ||
(type == EAP_TYPE_EXPANDED &&
vendor_id == 0 && vendor_type == EAP_TYPE_NAK)) {
if (response_is(EAP_TYPE_NAK)) {
l_debug("EAP peer not configured for method: %s",
eap_type_to_str(our_type, our_vendor_id,
our_vendor_type));
@ -456,16 +465,6 @@ static void eap_handle_response(struct eap_state *eap, const uint8_t *pkt,
goto unsupported_method;
}
/*
* RFC3748 5.7: "An implementation that supports the Expanded
* attribute MUST treat EAP Types that are less than 256 equivalently,
* whether they appear as a single octet or as the 32-bit Vendor-Type
* within an Expanded Type where Vendor-Id is 0."
* (with the exception of the Nak)
*/
if (type == EAP_TYPE_EXPANDED && vendor_id == 0)
type = vendor_type;
/*
* If we don't have peer's identity yet it means we've only sent the
* Identity Request so far so we expect an Identity Response and
@ -474,7 +473,7 @@ static void eap_handle_response(struct eap_state *eap, const uint8_t *pkt,
*/
if (!eap->identity) {
if (type != EAP_TYPE_IDENTITY)
if (!response_is(EAP_TYPE_IDENTITY))
goto unsupported_method;
/*
@ -494,18 +493,26 @@ static void eap_handle_response(struct eap_state *eap, const uint8_t *pkt,
return;
}
if (type != our_type ||
(type == EAP_TYPE_EXPANDED &&
(vendor_id != our_vendor_id ||
vendor_type != our_vendor_type)))
goto unsupported_method;
eap->method->handle_response(eap, pkt, len);
return;
/*
* RFC3748 5.7: "An implementation that supports the Expanded
* attribute MUST treat EAP Types that are less than 256 equivalently,
* whether they appear as a single octet or as the 32-bit Vendor-Type
* within an Expanded Type where Vendor-Id is 0."
* (with the exception of the Nak)
*/
if (our_type != EAP_TYPE_EXPANDED) {
if (response_is(our_type))
goto handle_response;
} else if (IS_EXPANDED_RESPONSE(our_vendor_id, our_vendor_type))
goto handle_response;
error:
unsupported_method:
eap_method_error(eap);
return;
handle_response:
eap->method->handle_response(eap, pkt, len);
}
void eap_rx_packet(struct eap_state *eap, const uint8_t *pkt, size_t len)