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fragattacks/wlantest/bss.c
Jouni Malinen 878723b920 wlantest: Do not ignore RSN/WPA/OSEN element before full BSS info 
wlantest used to ignore RSN/WPA/OSEN element in (Re)Association Request
frame if no Beacon frame had been seen from the AP before the
association exchange. This could result in not being able to derive keys
properly. Work around this by skipping that step if the BSS entry is not
yet complete.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
2017-11-14 12:55:48 +02:00

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9.6 KiB
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/*
* BSS list
* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/defs.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "crypto/sha1.h"
#include "wlantest.h"
struct wlantest_bss * bss_find(struct wlantest *wt, const u8 *bssid)
{
struct wlantest_bss *bss;
dl_list_for_each(bss, &wt->bss, struct wlantest_bss, list) {
if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
return bss;
}
return NULL;
}
struct wlantest_bss * bss_get(struct wlantest *wt, const u8 *bssid)
{
struct wlantest_bss *bss;
if (bssid[0] & 0x01)
return NULL; /* Skip group addressed frames */
bss = bss_find(wt, bssid);
if (bss)
return bss;
bss = os_zalloc(sizeof(*bss));
if (bss == NULL)
return NULL;
dl_list_init(&bss->sta);
dl_list_init(&bss->pmk);
dl_list_init(&bss->tdls);
os_memcpy(bss->bssid, bssid, ETH_ALEN);
dl_list_add(&wt->bss, &bss->list);
wpa_printf(MSG_DEBUG, "Discovered new BSS - " MACSTR,
MAC2STR(bss->bssid));
return bss;
}
void pmk_deinit(struct wlantest_pmk *pmk)
{
dl_list_del(&pmk->list);
os_free(pmk);
}
void tdls_deinit(struct wlantest_tdls *tdls)
{
dl_list_del(&tdls->list);
os_free(tdls);
}
void bss_deinit(struct wlantest_bss *bss)
{
struct wlantest_sta *sta, *n;
struct wlantest_pmk *pmk, *np;
struct wlantest_tdls *tdls, *nt;
dl_list_for_each_safe(sta, n, &bss->sta, struct wlantest_sta, list)
sta_deinit(sta);
dl_list_for_each_safe(pmk, np, &bss->pmk, struct wlantest_pmk, list)
pmk_deinit(pmk);
dl_list_for_each_safe(tdls, nt, &bss->tdls, struct wlantest_tdls, list)
tdls_deinit(tdls);
dl_list_del(&bss->list);
os_free(bss);
}
int bss_add_pmk_from_passphrase(struct wlantest_bss *bss,
const char *passphrase)
{
struct wlantest_pmk *pmk;
pmk = os_zalloc(sizeof(*pmk));
if (pmk == NULL)
return -1;
if (pbkdf2_sha1(passphrase, bss->ssid, bss->ssid_len, 4096,
pmk->pmk, PMK_LEN) < 0) {
os_free(pmk);
return -1;
}
wpa_printf(MSG_INFO, "Add possible PMK for BSSID " MACSTR
" based on passphrase '%s'",
MAC2STR(bss->bssid), passphrase);
wpa_hexdump(MSG_DEBUG, "Possible PMK", pmk->pmk, PMK_LEN);
dl_list_add(&bss->pmk, &pmk->list);
return 0;
}
static void bss_add_pmk(struct wlantest *wt, struct wlantest_bss *bss)
{
struct wlantest_passphrase *p;
dl_list_for_each(p, &wt->passphrase, struct wlantest_passphrase, list)
{
if (!is_zero_ether_addr(p->bssid) &&
os_memcmp(p->bssid, bss->bssid, ETH_ALEN) != 0)
continue;
if (p->ssid_len &&
(p->ssid_len != bss->ssid_len ||
os_memcmp(p->ssid, bss->ssid, p->ssid_len) != 0))
continue;
if (bss_add_pmk_from_passphrase(bss, p->passphrase) < 0)
break;
}
}
void bss_update(struct wlantest *wt, struct wlantest_bss *bss,
struct ieee802_11_elems *elems)
{
struct wpa_ie_data data;
int update = 0;
if (bss->capab_info != bss->prev_capab_info)
update = 1;
if (elems->ssid == NULL || elems->ssid_len > 32) {
wpa_printf(MSG_INFO, "Invalid or missing SSID in a Beacon "
"frame for " MACSTR, MAC2STR(bss->bssid));
bss->parse_error_reported = 1;
return;
}
if (bss->ssid_len != elems->ssid_len ||
os_memcmp(bss->ssid, elems->ssid, bss->ssid_len) != 0) {
wpa_printf(MSG_DEBUG, "Store SSID '%s' for BSSID " MACSTR,
wpa_ssid_txt(elems->ssid, elems->ssid_len),
MAC2STR(bss->bssid));
os_memcpy(bss->ssid, elems->ssid, elems->ssid_len);
bss->ssid_len = elems->ssid_len;
bss_add_pmk(wt, bss);
}
if (elems->osen == NULL) {
if (bss->osenie[0]) {
add_note(wt, MSG_INFO, "BSS " MACSTR
" - OSEN IE removed", MAC2STR(bss->bssid));
bss->rsnie[0] = 0;
update = 1;
}
} else {
if (bss->osenie[0] == 0 ||
os_memcmp(bss->osenie, elems->osen - 2,
elems->osen_len + 2) != 0) {
wpa_printf(MSG_INFO, "BSS " MACSTR " - OSEN IE "
"stored", MAC2STR(bss->bssid));
wpa_hexdump(MSG_DEBUG, "OSEN IE", elems->osen - 2,
elems->osen_len + 2);
update = 1;
}
os_memcpy(bss->osenie, elems->osen - 2,
elems->osen_len + 2);
}
if (elems->rsn_ie == NULL) {
if (bss->rsnie[0]) {
add_note(wt, MSG_INFO, "BSS " MACSTR
" - RSN IE removed", MAC2STR(bss->bssid));
bss->rsnie[0] = 0;
update = 1;
}
} else {
if (bss->rsnie[0] == 0 ||
os_memcmp(bss->rsnie, elems->rsn_ie - 2,
elems->rsn_ie_len + 2) != 0) {
wpa_printf(MSG_INFO, "BSS " MACSTR " - RSN IE "
"stored", MAC2STR(bss->bssid));
wpa_hexdump(MSG_DEBUG, "RSN IE", elems->rsn_ie - 2,
elems->rsn_ie_len + 2);
update = 1;
}
os_memcpy(bss->rsnie, elems->rsn_ie - 2,
elems->rsn_ie_len + 2);
}
if (elems->wpa_ie == NULL) {
if (bss->wpaie[0]) {
add_note(wt, MSG_INFO, "BSS " MACSTR
" - WPA IE removed", MAC2STR(bss->bssid));
bss->wpaie[0] = 0;
update = 1;
}
} else {
if (bss->wpaie[0] == 0 ||
os_memcmp(bss->wpaie, elems->wpa_ie - 2,
elems->wpa_ie_len + 2) != 0) {
wpa_printf(MSG_INFO, "BSS " MACSTR " - WPA IE "
"stored", MAC2STR(bss->bssid));
wpa_hexdump(MSG_DEBUG, "WPA IE", elems->wpa_ie - 2,
elems->wpa_ie_len + 2);
update = 1;
}
os_memcpy(bss->wpaie, elems->wpa_ie - 2,
elems->wpa_ie_len + 2);
}
if (elems->mdie)
os_memcpy(bss->mdid, elems->mdie, 2);
if (!update)
return;
bss->beacon_seen = 1;
bss->prev_capab_info = bss->capab_info;
bss->proto = 0;
bss->pairwise_cipher = 0;
bss->group_cipher = 0;
bss->key_mgmt = 0;
bss->rsn_capab = 0;
bss->mgmt_group_cipher = 0;
if (bss->wpaie[0]) {
if (wpa_parse_wpa_ie_wpa(bss->wpaie, 2 + bss->wpaie[1], &data)
< 0) {
add_note(wt, MSG_INFO, "Failed to parse WPA IE from "
MACSTR, MAC2STR(bss->bssid));
} else {
bss->proto |= data.proto;
bss->pairwise_cipher |= data.pairwise_cipher;
bss->group_cipher |= data.group_cipher;
bss->key_mgmt |= data.key_mgmt;
bss->rsn_capab = data.capabilities;
bss->mgmt_group_cipher |= data.mgmt_group_cipher;
}
}
if (bss->rsnie[0]) {
if (wpa_parse_wpa_ie_rsn(bss->rsnie, 2 + bss->rsnie[1], &data)
< 0) {
add_note(wt, MSG_INFO, "Failed to parse RSN IE from "
MACSTR, MAC2STR(bss->bssid));
} else {
bss->proto |= data.proto;
bss->pairwise_cipher |= data.pairwise_cipher;
bss->group_cipher |= data.group_cipher;
bss->key_mgmt |= data.key_mgmt;
bss->rsn_capab = data.capabilities;
bss->mgmt_group_cipher |= data.mgmt_group_cipher;
}
}
if (bss->osenie[0]) {
bss->proto |= WPA_PROTO_OSEN;
bss->pairwise_cipher |= WPA_CIPHER_CCMP;
bss->group_cipher |= WPA_CIPHER_CCMP;
bss->key_mgmt |= WPA_KEY_MGMT_OSEN;
}
if (!(bss->proto & WPA_PROTO_RSN) ||
!(bss->rsn_capab & WPA_CAPABILITY_MFPC))
bss->mgmt_group_cipher = 0;
if (!bss->wpaie[0] && !bss->rsnie[0] && !bss->osenie[0] &&
(bss->capab_info & WLAN_CAPABILITY_PRIVACY))
bss->group_cipher = WPA_CIPHER_WEP40;
wpa_printf(MSG_INFO, "BSS " MACSTR
" proto=%s%s%s%s"
"pairwise=%s%s%s%s%s%s%s"
"group=%s%s%s%s%s%s%s%s%s"
"mgmt_group_cipher=%s%s%s%s%s"
"key_mgmt=%s%s%s%s%s%s%s%s%s"
"rsn_capab=%s%s%s%s%s",
MAC2STR(bss->bssid),
bss->proto == 0 ? "OPEN " : "",
bss->proto & WPA_PROTO_WPA ? "WPA " : "",
bss->proto & WPA_PROTO_RSN ? "WPA2 " : "",
bss->proto & WPA_PROTO_OSEN ? "OSEN " : "",
bss->pairwise_cipher == 0 ? "N/A " : "",
bss->pairwise_cipher & WPA_CIPHER_NONE ? "NONE " : "",
bss->pairwise_cipher & WPA_CIPHER_TKIP ? "TKIP " : "",
bss->pairwise_cipher & WPA_CIPHER_CCMP ? "CCMP " : "",
bss->pairwise_cipher & WPA_CIPHER_CCMP_256 ? "CCMP-256 " :
"",
bss->pairwise_cipher & WPA_CIPHER_GCMP ? "GCMP " : "",
bss->pairwise_cipher & WPA_CIPHER_GCMP_256 ? "GCMP-256 " :
"",
bss->group_cipher == 0 ? "N/A " : "",
bss->group_cipher & WPA_CIPHER_NONE ? "NONE " : "",
bss->group_cipher & WPA_CIPHER_WEP40 ? "WEP40 " : "",
bss->group_cipher & WPA_CIPHER_WEP104 ? "WEP104 " : "",
bss->group_cipher & WPA_CIPHER_TKIP ? "TKIP " : "",
bss->group_cipher & WPA_CIPHER_CCMP ? "CCMP " : "",
bss->group_cipher & WPA_CIPHER_CCMP_256 ? "CCMP-256 " : "",
bss->group_cipher & WPA_CIPHER_GCMP ? "GCMP " : "",
bss->group_cipher & WPA_CIPHER_GCMP_256 ? "GCMP-256 " : "",
bss->mgmt_group_cipher == 0 ? "N/A " : "",
bss->mgmt_group_cipher & WPA_CIPHER_AES_128_CMAC ?
"BIP " : "",
bss->mgmt_group_cipher & WPA_CIPHER_BIP_GMAC_128 ?
"BIP-GMAC-128 " : "",
bss->mgmt_group_cipher & WPA_CIPHER_BIP_GMAC_256 ?
"BIP-GMAC-256 " : "",
bss->mgmt_group_cipher & WPA_CIPHER_BIP_CMAC_256 ?
"BIP-CMAC-256 " : "",
bss->key_mgmt == 0 ? "N/A " : "",
bss->key_mgmt & WPA_KEY_MGMT_IEEE8021X ? "EAP " : "",
bss->key_mgmt & WPA_KEY_MGMT_PSK ? "PSK " : "",
bss->key_mgmt & WPA_KEY_MGMT_WPA_NONE ? "WPA-NONE " : "",
bss->key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X ? "FT-EAP " : "",
bss->key_mgmt & WPA_KEY_MGMT_FT_PSK ? "FT-PSK " : "",
bss->key_mgmt & WPA_KEY_MGMT_IEEE8021X_SHA256 ?
"EAP-SHA256 " : "",
bss->key_mgmt & WPA_KEY_MGMT_PSK_SHA256 ?
"PSK-SHA256 " : "",
bss->key_mgmt & WPA_KEY_MGMT_OSEN ? "OSEN " : "",
bss->rsn_capab & WPA_CAPABILITY_PREAUTH ? "PREAUTH " : "",
bss->rsn_capab & WPA_CAPABILITY_NO_PAIRWISE ?
"NO_PAIRWISE " : "",
bss->rsn_capab & WPA_CAPABILITY_MFPR ? "MFPR " : "",
bss->rsn_capab & WPA_CAPABILITY_MFPC ? "MFPC " : "",
bss->rsn_capab & WPA_CAPABILITY_PEERKEY_ENABLED ?
"PEERKEY " : "");
}
void bss_flush(struct wlantest *wt)
{
struct wlantest_bss *bss, *n;
dl_list_for_each_safe(bss, n, &wt->bss, struct wlantest_bss, list)
bss_deinit(bss);
}
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