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peap: Extend EAP Extensions to handle multiple TLVs 

The handler for EAP Extensions has been modified to support multiple
TLV types instead of the single Result TLV. This will allow to handle
the other TLVs such as Crypto-Binding TLV.
This commit is contained in:
Tim Kourt 2019-12-12 12:10:15 -08:00 committed by Denis Kenzior
parent fb338154a2
commit 8e5f838219
1 changed files with 88 additions and 37 deletions
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125
src/eap-peap.c
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@ -111,6 +111,7 @@ static void eap_peap_phase2_complete(enum eap_result result, void *user_data)
*/
#define EAP_EXTENSIONS_HEADER_LEN 5
#define EAP_EXTENSIONS_TLV_HEADER_LEN 4
#define EAP_EXTENSIONS_TLV_M_BIT_MASK 0x8000
enum eap_extensions_tlv_type {
/* Reserved = 0x0000, */
@ -127,39 +128,24 @@ enum eap_extensions_result {
static int eap_extensions_handle_result_tlv(struct eap_state *eap,
const uint8_t *data,
size_t data_len,
uint8_t *response)
uint8_t *response,
uint8_t *result)
{
static const uint8_t result_tlv_len = 2;
struct peap_state *peap_state;
uint16_t type;
uint16_t len;
uint16_t result;
if (data_len < EAP_EXTENSIONS_TLV_HEADER_LEN + 2)
return -ENOENT;
if (data_len != result_tlv_len)
return -EBADMSG;
type = l_get_be16(data);
*result = l_get_be16(data);
if (type != EAP_EXTENSIONS_TLV_TYPE_RESULT)
return -ENOENT;
l_debug("result: %d", *result);
data += 2;
len = l_get_be16(data);
if (len != 2)
return -ENOENT;
data += 2;
result = l_get_be16(data);
l_debug("result: %d", result);
switch (result) {
switch (*result) {
case EAP_EXTENSIONS_RESULT_SUCCCESS:
peap_state = eap_tls_common_get_variant_data(eap);
result = eap_method_is_success(peap_state->phase2) ?
*result = eap_method_is_success(peap_state->phase2) ?
EAP_EXTENSIONS_RESULT_SUCCCESS :
EAP_EXTENSIONS_RESULT_FAILURE;
/* fall through */
@ -169,13 +155,68 @@ static int eap_extensions_handle_result_tlv(struct eap_state *eap,
return -ENOENT;
}
l_put_be16(EAP_EXTENSIONS_TLV_TYPE_RESULT,
&response[EAP_EXTENSIONS_HEADER_LEN]);
l_put_be16(2, &response[EAP_EXTENSIONS_HEADER_LEN + 2]);
l_put_be16(result, &response[EAP_EXTENSIONS_HEADER_LEN +
EAP_EXTENSIONS_TLV_HEADER_LEN]);
/* Build response Result TLV */
return result;
l_put_be16(EAP_EXTENSIONS_TLV_TYPE_RESULT, response);
response += 2;
l_put_be16(result_tlv_len, response);
response += 2;
l_put_be16(*result, response);
return EAP_EXTENSIONS_TLV_HEADER_LEN + result_tlv_len;
}
static int eap_extensions_process_tlvs(struct eap_state *eap,
const uint8_t *data,
size_t data_len,
uint8_t *response,
uint8_t *result)
{
int response_len = 0;
uint16_t tlv_type;
uint16_t tlv_value_len;
while (data_len >= EAP_EXTENSIONS_TLV_HEADER_LEN) {
int response_tlv_len = 0;
tlv_type = l_get_be16(data);
data += 2;
tlv_value_len = l_get_be16(data);
data += 2;
data_len -= EAP_EXTENSIONS_TLV_HEADER_LEN;
if (data_len < tlv_value_len)
return -EBADMSG;
switch (tlv_type) {
case EAP_EXTENSIONS_TLV_TYPE_RESULT:
response_tlv_len = eap_extensions_handle_result_tlv(eap,
data, tlv_value_len, response,
result);
break;
default:
if (tlv_type & EAP_EXTENSIONS_TLV_M_BIT_MASK)
return -ENOENT;
break;
}
if (response_tlv_len < 0)
return response_tlv_len;
response += response_tlv_len;
response_len += response_tlv_len;
data += tlv_value_len;
data_len -= tlv_value_len;
}
return response_len;
}
static void eap_extensions_handle_request(struct eap_state *eap,
@ -184,24 +225,34 @@ static void eap_extensions_handle_request(struct eap_state *eap,
size_t len)
{
struct peap_state *peap_state;
uint8_t response[EAP_EXTENSIONS_HEADER_LEN +
EAP_EXTENSIONS_TLV_HEADER_LEN + 2];
int r = eap_extensions_handle_result_tlv(eap, pkt, len, response);
uint8_t result = EAP_EXTENSIONS_RESULT_FAILURE;
/*
* The buffer size is chosen to satisfy the needs of the two supported
* TLVs.
*/
uint8_t response[256];
int response_len;
if (r < 0)
response_len = eap_extensions_process_tlvs(eap, pkt, len,
&response[EAP_EXTENSIONS_HEADER_LEN],
&result);
if (response_len < 0)
return;
response_len += EAP_EXTENSIONS_HEADER_LEN;
response[0] = EAP_CODE_RESPONSE;
response[1] = id;
l_put_be16(sizeof(response), &response[2]);
l_put_be16(response_len, &response[2]);
response[4] = EAP_TYPE_EXTENSIONS;
eap_peap_phase2_send_response(response, sizeof(response), eap);
eap_peap_phase2_send_response(response, response_len, eap);
eap_discard_success_and_failure(eap, false);
eap_tls_common_set_completed(eap);
if (r != EAP_EXTENSIONS_RESULT_SUCCCESS) {
if (result != EAP_EXTENSIONS_RESULT_SUCCCESS) {
eap_tls_common_set_phase2_failed(eap);
eap_tls_common_tunnel_close(eap);