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wlantest: Extend BIP support to cover BIP-CMAC-256

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Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2015-01-23 17:24:24 +02:00 committed by Jouni Malinen
parent 30bff1d0f4
commit cb80fadaa7
6 changed files with 74 additions and 28 deletions
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14
wlantest/bip.c
View File

@ -14,8 +14,8 @@
#include "wlantest.h"
u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
size_t *prot_len)
u8 * bip_protect(const u8 *igtk, size_t igtk_len, u8 *frame, size_t len,
u8 *ipn, int keyid, size_t *prot_len)
{
u8 *prot, *pos, *buf;
u8 mic[16];
@ -23,19 +23,19 @@ u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
struct ieee80211_hdr *hdr;
size_t plen;
plen = len + 18;
plen = len + igtk_len == 32 ? 26 : 18;
prot = os_malloc(plen);
if (prot == NULL)
return NULL;
os_memcpy(prot, frame, len);
pos = prot + len;
*pos++ = WLAN_EID_MMIE;
*pos++ = 16;
*pos++ = igtk_len == 32 ? 24 : 16;
WPA_PUT_LE16(pos, keyid);
pos += 2;
os_memcpy(pos, ipn, 6);
pos += 6;
os_memset(pos, 0, 8); /* MIC */
os_memset(pos, 0, igtk_len == 32 ? 16 : 8); /* MIC */
buf = os_malloc(plen + 20 - 24);
if (buf == NULL) {
@ -59,8 +59,8 @@ u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
}
os_free(buf);
os_memcpy(pos, mic, 8);
wpa_hexdump(MSG_DEBUG, "BIP MMIE MIC", pos, 8);
os_memcpy(pos, mic, igtk_len == 32 ? 16 : 8);
wpa_hexdump(MSG_DEBUG, "BIP MMIE MIC", pos, igtk_len == 32 ? 16 : 8);
*prot_len = plen;
return prot;

9
wlantest/inject.c
View File

@ -82,17 +82,18 @@ static int wlantest_inject_bip(struct wlantest *wt, struct wlantest_bss *bss,
u8 *frame, size_t len, int incorrect_key)
{
u8 *prot;
u8 dummy[16];
u8 dummy[32];
int ret;
size_t plen;
if (!bss->igtk_set[bss->igtk_idx])
if (!bss->igtk_len[bss->igtk_idx])
return -1;
os_memset(dummy, 0x11, sizeof(dummy));
inc_byte_array(bss->ipn[bss->igtk_idx], 6);
prot = bip_protect(incorrect_key ? dummy : bss->igtk[bss->igtk_idx],
bss->igtk_len[bss->igtk_idx],
frame, len, bss->ipn[bss->igtk_idx],
bss->igtk_idx, &plen);
if (prot == NULL)
@ -300,7 +301,7 @@ int wlantest_inject(struct wlantest *wt, struct wlantest_bss *bss,
prot == WLANTEST_INJECT_INCORRECT_KEY) && bss) {
if (!sta &&
((WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
!bss->igtk_set[bss->igtk_idx]) ||
!bss->igtk_len[bss->igtk_idx]) ||
(WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
!bss->gtk_len[bss->gtk_idx]))) {
wpa_printf(MSG_INFO, "No GTK/IGTK known for "
@ -323,7 +324,7 @@ int wlantest_inject(struct wlantest *wt, struct wlantest_bss *bss,
bss->gtk_len[bss->gtk_idx])
protect = 1;
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
bss->igtk_set[bss->igtk_idx])
bss->igtk_len[bss->igtk_idx])
protect = 1;
}
}

25
wlantest/rx_eapol.c
View File

@ -464,7 +464,30 @@ static void learn_kde_keys(struct wlantest *wt, struct wlantest_bss *bss,
wpa_hexdump(MSG_DEBUG, "IGTK", ie.igtk + 8,
16);
os_memcpy(bss->igtk[id], ie.igtk + 8, 16);
bss->igtk_set[id] = 1;
bss->igtk_len[id] = 16;
ipn = ie.igtk + 2;
bss->ipn[id][0] = ipn[5];
bss->ipn[id][1] = ipn[4];
bss->ipn[id][2] = ipn[3];
bss->ipn[id][3] = ipn[2];
bss->ipn[id][4] = ipn[1];
bss->ipn[id][5] = ipn[0];
bss->igtk_idx = id;
}
} else if (ie.igtk_len == 40) {
u16 id;
id = WPA_GET_LE16(ie.igtk);
if (id > 5) {
add_note(wt, MSG_INFO,
"Unexpected IGTK KeyID %u", id);
} else {
const u8 *ipn;
add_note(wt, MSG_DEBUG, "IGTK KeyID %u", id);
wpa_hexdump(MSG_DEBUG, "IPN", ie.igtk + 2, 6);
wpa_hexdump(MSG_DEBUG, "IGTK", ie.igtk + 8,
32);
os_memcpy(bss->igtk[id], ie.igtk + 8, 32);
bss->igtk_len[id] = 32;
ipn = ie.igtk + 2;
bss->ipn[id][0] = ipn[5];
bss->ipn[id][1] = ipn[4];

43
wlantest/rx_mgmt.c
View File

@ -753,12 +753,24 @@ static void rx_mgmt_action(struct wlantest *wt, const u8 *data, size_t len,
}
static int check_mmie_mic(const u8 *igtk, const u8 *data, size_t len)
static int check_mmie_mic(const u8 *igtk, size_t igtk_len,
const u8 *data, size_t len)
{
u8 *buf;
u8 mic[16];
u16 fc;
const struct ieee80211_hdr *hdr;
int ret, mic_len;
if (igtk_len == 32)
mic_len = 16;
else if (igtk_len == 16)
mic_len = 8;
else
return -1;
if (len < 24 || len - 24 < mic_len)
return -1;
buf = os_malloc(len + 20 - 24);
if (buf == NULL)
@ -772,19 +784,23 @@ static int check_mmie_mic(const u8 *igtk, const u8 *data, size_t len)
os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
/* Frame body with MMIE MIC masked to zero */
os_memcpy(buf + 20, data + 24, len - 24 - 8);
os_memset(buf + 20 + len - 24 - 8, 0, 8);
os_memcpy(buf + 20, data + 24, len - 24 - mic_len);
os_memset(buf + 20 + len - 24 - mic_len, 0, mic_len);
wpa_hexdump(MSG_MSGDUMP, "BIP: AAD|Body(masked)", buf, len + 20 - 24);
/* MIC = L(AES-128-CMAC(AAD || Frame Body(masked)), 0, 64) */
if (omac1_aes_128(igtk, buf, len + 20 - 24, mic) < 0) {
if (igtk_len == 32)
ret = omac1_aes_256(igtk, buf, len + 20 - 24, mic);
else
ret = omac1_aes_128(igtk, buf, len + 20 - 24, mic);
if (ret < 0) {
os_free(buf);
return -1;
}
os_free(buf);
if (os_memcmp(data + len - 8, mic, 8) != 0)
if (os_memcmp(data + len - mic_len, mic, mic_len) != 0)
return -1;
return 0;
@ -798,6 +814,7 @@ static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
const u8 *mmie;
u16 keyid;
struct wlantest_bss *bss;
size_t mic_len;
mgmt = (const struct ieee80211_mgmt *) data;
fc = le_to_host16(mgmt->frame_control);
@ -814,8 +831,11 @@ static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
if (bss == NULL)
return 0; /* No key known yet */
if (len < 24 + 18 || data[len - 18] != WLAN_EID_MMIE ||
data[len - 17] != 16) {
mic_len = bss->igtk_len[4] == 32 || bss->igtk_len[5] == 32 ? 16 : 8;
if (len < 24 + 10 + mic_len ||
data[len - (10 + mic_len)] != WLAN_EID_MMIE ||
data[len - (10 + mic_len - 1)] != 8 + mic_len) {
/* No MMIE */
if (bss->rsn_capab & WPA_CAPABILITY_MFPC) {
add_note(wt, MSG_INFO, "Robust group-addressed "
@ -827,7 +847,7 @@ static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
return 0;
}
mmie = data + len - 16;
mmie = data + len - (8 + mic_len);
keyid = WPA_GET_LE16(mmie);
if (keyid & 0xf000) {
add_note(wt, MSG_INFO, "MMIE KeyID reserved bits not zero "
@ -842,9 +862,9 @@ static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
}
wpa_printf(MSG_DEBUG, "MMIE KeyID %u", keyid);
wpa_hexdump(MSG_MSGDUMP, "MMIE IPN", mmie + 2, 6);
wpa_hexdump(MSG_MSGDUMP, "MMIE MIC", mmie + 8, 8);
wpa_hexdump(MSG_MSGDUMP, "MMIE MIC", mmie + 8, mic_len);
if (!bss->igtk_set[keyid]) {
if (!bss->igtk_len[keyid]) {
add_note(wt, MSG_DEBUG, "No IGTK known to validate BIP frame");
return 0;
}
@ -856,7 +876,8 @@ static int check_bip(struct wlantest *wt, const u8 *data, size_t len)
wpa_hexdump(MSG_INFO, "Last RX IPN", bss->ipn[keyid], 6);
}
if (check_mmie_mic(bss->igtk[keyid], data, len) < 0) {
if (check_mmie_mic(bss->igtk[keyid], bss->igtk_len[keyid], data, len) <
0) {
add_note(wt, MSG_INFO, "Invalid MMIE MIC in a frame from "
MACSTR, MAC2STR(mgmt->sa));
bss->counters[WLANTEST_BSS_COUNTER_INVALID_BIP_MMIE]++;

3
wlantest/test_vectors.c
View File

@ -159,7 +159,8 @@ static void test_vector_bip(void)
wpa_hexdump(MSG_INFO, "IPN", ipn, sizeof(ipn));
wpa_hexdump(MSG_INFO, "Plaintext frame", frame, sizeof(frame));
prot = bip_protect(igtk, frame, sizeof(frame), ipn, 4, &prot_len);
prot = bip_protect(igtk, sizeof(igtk), frame, sizeof(frame),
ipn, 4, &prot_len);
if (prot == NULL) {
wpa_printf(MSG_ERROR, "Failed to protect BIP frame");
return;

8
wlantest/wlantest.h
View File

@ -145,8 +145,8 @@ struct wlantest_bss {
size_t gtk_len[4];
int gtk_idx;
u8 rsc[4][6];
u8 igtk[6][16];
int igtk_set[6];
u8 igtk[6][32];
size_t igtk_len[6];
int igtk_idx;
u8 ipn[6][6];
u32 counters[NUM_WLANTEST_BSS_COUNTER];
@ -284,8 +284,8 @@ void tkip_get_pn(u8 *pn, const u8 *data);
u8 * wep_decrypt(struct wlantest *wt, const struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, size_t *decrypted_len);
u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
size_t *prot_len);
u8 * bip_protect(const u8 *igtk, size_t igtk_len, u8 *frame, size_t len,
u8 *ipn, int keyid, size_t *prot_len);
u8 * bip_gmac_protect(const u8 *igtk, size_t igtk_len, u8 *frame, size_t len,
u8 *ipn, int keyid, size_t *prot_len);