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EAP peer: Clear temporary message buffers before freeing

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These buffers in TLS-based EAP methods might contain keys or password
(e.g., when using TTLS-PAP or PEAP-GTC), so clear them explicitly to
avoid leaving such material into heap memory unnecessarily.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen
2019-02-05 20:26:50 +02:00
committed by Sarvesh Bodakhe
parent aa987d418e
commit 1e38fa2c12
3 changed files with 56 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
components/wpa_supplicant/src/eap_peer/eap_peap.c
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@@ -209,9 +209,9 @@ eap_peap_deinit(struct eap_sm *sm, void *priv)
eap_peer_tls_ssl_deinit(sm, &data->ssl);
eap_peap_free_key(data);
os_free(data->session_id);
wpabuf_free(data->pending_phase2_req);
wpabuf_free(data->pending_resp);
os_free(data);
wpabuf_clear_free(data->pending_phase2_req);
wpabuf_clear_free(data->pending_resp);
bin_clear_free(data, sizeof(*data));
}
@@ -406,7 +406,7 @@ eap_tlv_build_result(struct eap_sm *sm,
wpabuf_put_be16(msg, status); /* Status */
if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
wpabuf_free(msg);
wpabuf_clear_free(msg);
return NULL;
}
@@ -721,10 +721,11 @@ static int eap_peap_phase2_request(struct eap_sm *sm,
if (*resp == NULL) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
wpabuf_clear_free(buf);
return -1;
}
wpabuf_put_buf(*resp, buf);
wpabuf_free(buf);
wpabuf_clear_free(buf);
break;
}
}
@@ -795,7 +796,7 @@ static int eap_peap_phase2_request(struct eap_sm *sm,
if (*resp == NULL) {
wpa_printf(MSG_ERROR, "phase 2 response failure");
wpabuf_free(data->pending_phase2_req);
wpabuf_clear_free(data->pending_phase2_req);
data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
}
/*
@@ -883,7 +884,7 @@ continue_req:
struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
wpabuf_len(in_decrypted));
if (nmsg == NULL) {
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
return 0;
}
nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
@@ -893,7 +894,7 @@ continue_req:
nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
wpabuf_len(in_decrypted));
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
in_decrypted = nmsg;
}
@@ -945,7 +946,7 @@ continue_req:
wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
"EAP frame (len=%lu)",
(unsigned long) wpabuf_len(in_decrypted));
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
return 0;
}
len = be_to_host16(hdr->length);
@@ -954,7 +955,7 @@ continue_req:
"Phase 2 EAP frame (len=%lu hdr->length=%lu)",
(unsigned long) wpabuf_len(in_decrypted),
(unsigned long) len);
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
return 0;
}
if (len < wpabuf_len(in_decrypted)) {
@@ -971,7 +972,7 @@ continue_req:
case EAP_CODE_REQUEST:
if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
&resp)) {
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
wpa_printf(MSG_ERROR, "EAP-PEAP: Phase2 Request "
"processing failed");
return 0;
@@ -990,7 +991,7 @@ continue_req:
"completed successfully");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
return 0;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
@@ -1000,7 +1001,7 @@ continue_req:
ret->methodState = METHOD_DONE;
data->phase2_success = 1;
if (data->peap_outer_success == 2) {
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
"to finish authentication");
return 1;
@@ -1046,7 +1047,7 @@ continue_req:
break;
}
wpabuf_free(in_decrypted);
wpabuf_clear_free(in_decrypted);
if (resp) {
int skip_change2 = 0;
@@ -1078,7 +1079,7 @@ continue_req:
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
"a Phase 2 frame");
}
wpabuf_free(resp);
wpabuf_clear_free(resp);
}
return 0;
@@ -1178,7 +1179,7 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
if (sm->waiting_ext_cert_check) {
wpa_printf(MSG_DEBUG,
"EAP-PEAP: Waiting external server certificate validation");
wpabuf_free(data->pending_resp);
wpabuf_clear_free(data->pending_resp);
data->pending_resp = resp;
return NULL;
}
@@ -1261,6 +1262,7 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
* Application data included in the handshake message.
*/
wpabuf_free(data->pending_phase2_req);
wpabuf_clear_free(data->pending_phase2_req);
data->pending_phase2_req = resp;
resp = NULL;
wpabuf_set(&msg, pos, left);
@@ -1274,7 +1276,7 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
}
if (res == 1) {
wpabuf_free(resp);
wpabuf_clear_free(resp);
return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
data->peap_version);
}
@@ -1297,9 +1299,9 @@ static void
eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
wpabuf_free(data->pending_phase2_req);
wpabuf_clear_free(data->pending_phase2_req);
data->pending_phase2_req = NULL;
wpabuf_free(data->pending_resp);
wpabuf_clear_free(data->pending_resp);
data->pending_resp = NULL;
data->crypto_binding_used = 0;
}