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EAP-PEAP: Use os_memcmp_const() for hash/password comparisons

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This makes the implementation less likely to provide useful timing
information to potential attackers from comparisons of information
received from a remote device and private material known only by the
authorized devices.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-06-29 20:22:44 +03:00
parent 7b1e745870
commit cba0f8698b
2 changed files with 2 additions and 2 deletions
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2
src/eap_peer/eap_peap.c
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@ -423,7 +423,7 @@ static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
buf, sizeof(buf));
hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
"cryptobinding TLV");
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",

2
src/eap_server/eap_server_peap.c
View file

@ -593,7 +593,7 @@ static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
buf[60] = EAP_TYPE_PEAP;
hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
"cryptobinding TLV");
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);