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hostapd/wlantest/inject.c
Chaitanya T K 409cd147b7 wlantest: Fix the injection of protected broadcast frames 
Injecting protected broadcast frames fails because of the unnecessary
null check for sta. In case of broadcast frames sta can be null, so
remove the check.

Reported-by: Janardhan R <janardhanr@posedge.com>
Signed-hostap: Chaitanya T K <chaitanyatk@posedge.com>
2013-05-04 11:36:28 +03:00

339 lines
8.4 KiB
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/*
* wlantest frame injection
* 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 "crypto/aes_wrap.h"
#include "wlantest.h"
static int inject_frame(int s, const void *data, size_t len)
{
#define IEEE80211_RADIOTAP_F_FRAG 0x08
unsigned char rtap_hdr[] = {
0x00, 0x00, /* radiotap version */
0x0e, 0x00, /* radiotap length */
0x02, 0xc0, 0x00, 0x00, /* bmap: flags, tx and rx flags */
IEEE80211_RADIOTAP_F_FRAG, /* F_FRAG (fragment if required) */
0x00, /* padding */
0x00, 0x00, /* RX and TX flags to indicate that */
0x00, 0x00, /* this is the injected frame directly */
};
struct iovec iov[2] = {
{
.iov_base = &rtap_hdr,
.iov_len = sizeof(rtap_hdr),
},
{
.iov_base = (void *) data,
.iov_len = len,
}
};
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = iov,
.msg_iovlen = 2,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0,
};
int ret;
ret = sendmsg(s, &msg, 0);
if (ret < 0)
perror("sendmsg");
return ret;
}
static int is_robust_mgmt(u8 *frame, size_t len)
{
struct ieee80211_mgmt *mgmt;
u16 fc, stype;
if (len < 24)
return 0;
mgmt = (struct ieee80211_mgmt *) frame;
fc = le_to_host16(mgmt->frame_control);
if (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_MGMT)
return 0;
stype = WLAN_FC_GET_STYPE(fc);
if (stype == WLAN_FC_STYPE_DEAUTH || stype == WLAN_FC_STYPE_DISASSOC)
return 1;
if (stype == WLAN_FC_STYPE_ACTION) {
if (len < 25)
return 0;
if (mgmt->u.action.category != WLAN_ACTION_PUBLIC)
return 1;
}
return 0;
}
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];
int ret;
size_t plen;
if (!bss->igtk_set[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],
frame, len, bss->ipn[bss->igtk_idx],
bss->igtk_idx, &plen);
if (prot == NULL)
return -1;
ret = inject_frame(wt->monitor_sock, prot, plen);
os_free(prot);
return (ret < 0) ? -1 : 0;
}
static int wlantest_inject_prot_bc(struct wlantest *wt,
struct wlantest_bss *bss,
u8 *frame, size_t len, int incorrect_key)
{
u8 *crypt;
size_t crypt_len;
int ret;
u8 dummy[64];
u8 *pn;
struct ieee80211_hdr *hdr;
u16 fc;
int hdrlen;
hdr = (struct ieee80211_hdr *) frame;
hdrlen = 24;
fc = le_to_host16(hdr->frame_control);
if (!bss->gtk_len[bss->gtk_idx])
return -1;
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
(WLAN_FC_TODS | WLAN_FC_FROMDS))
hdrlen += ETH_ALEN;
pn = bss->rsc[bss->gtk_idx];
inc_byte_array(pn, 6);
os_memset(dummy, 0x11, sizeof(dummy));
if (bss->group_cipher == WPA_CIPHER_TKIP)
crypt = tkip_encrypt(incorrect_key ? dummy :
bss->gtk[bss->gtk_idx],
frame, len, hdrlen, NULL, pn,
bss->gtk_idx, &crypt_len);
else
crypt = ccmp_encrypt(incorrect_key ? dummy :
bss->gtk[bss->gtk_idx],
frame, len, hdrlen, NULL, pn,
bss->gtk_idx, &crypt_len);
if (crypt == NULL)
return -1;
ret = inject_frame(wt->monitor_sock, crypt, crypt_len);
os_free(crypt);
return (ret < 0) ? -1 : 0;
}
static int wlantest_inject_prot(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, u8 *frame,
size_t len, int incorrect_key)
{
u8 *crypt;
size_t crypt_len;
int ret;
u8 dummy[64];
u8 *pn;
struct ieee80211_hdr *hdr;
u16 fc;
int tid = 0;
u8 *qos = NULL;
int hdrlen;
struct wlantest_tdls *tdls = NULL;
const u8 *tk = NULL;
hdr = (struct ieee80211_hdr *) frame;
hdrlen = 24;
fc = le_to_host16(hdr->frame_control);
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
(fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == 0) {
struct wlantest_sta *sta2;
bss = bss_get(wt, hdr->addr3);
if (bss == NULL) {
wpa_printf(MSG_DEBUG, "No BSS found for TDLS "
"injection");
return -1;
}
sta = sta_find(bss, hdr->addr2);
sta2 = sta_find(bss, hdr->addr1);
if (sta == NULL || sta2 == NULL) {
wpa_printf(MSG_DEBUG, "No stations found for TDLS "
"injection");
return -1;
}
dl_list_for_each(tdls, &bss->tdls, struct wlantest_tdls, list)
{
if ((tdls->init == sta && tdls->resp == sta2) ||
(tdls->init == sta2 && tdls->resp == sta)) {
if (!tdls->link_up)
wpa_printf(MSG_DEBUG, "TDLS: Link not "
"up, but injecting Data "
"frame on direct link");
tk = tdls->tpk.tk;
break;
}
}
}
if (tk == NULL && sta == NULL) {
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
return wlantest_inject_bip(wt, bss, frame, len,
incorrect_key);
return wlantest_inject_prot_bc(wt, bss, frame, len,
incorrect_key);
}
if (tk == NULL && !sta->ptk_set) {
wpa_printf(MSG_DEBUG, "No key known for injection");
return -1;
}
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
tid = 16;
else if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) {
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
(WLAN_FC_TODS | WLAN_FC_FROMDS))
hdrlen += ETH_ALEN;
if (WLAN_FC_GET_STYPE(fc) & 0x08) {
qos = frame + hdrlen;
hdrlen += 2;
tid = qos[0] & 0x0f;
}
}
if (tk) {
if (os_memcmp(hdr->addr2, tdls->init->addr, ETH_ALEN) == 0)
pn = tdls->rsc_init[tid];
else
pn = tdls->rsc_resp[tid];
} else if (os_memcmp(hdr->addr2, bss->bssid, ETH_ALEN) == 0)
pn = sta->rsc_fromds[tid];
else
pn = sta->rsc_tods[tid];
inc_byte_array(pn, 6);
os_memset(dummy, 0x11, sizeof(dummy));
if (tk)
crypt = ccmp_encrypt(incorrect_key ? dummy : tk,
frame, len, hdrlen, qos, pn, 0,
&crypt_len);
else if (sta->pairwise_cipher == WPA_CIPHER_TKIP)
crypt = tkip_encrypt(incorrect_key ? dummy : sta->ptk.tk1,
frame, len, hdrlen, qos, pn, 0,
&crypt_len);
else
crypt = ccmp_encrypt(incorrect_key ? dummy : sta->ptk.tk1,
frame, len, hdrlen, qos, pn, 0,
&crypt_len);
if (crypt == NULL) {
wpa_printf(MSG_DEBUG, "Frame encryption failed");
return -1;
}
wpa_hexdump(MSG_DEBUG, "Inject frame (encrypted)", crypt, crypt_len);
ret = inject_frame(wt->monitor_sock, crypt, crypt_len);
os_free(crypt);
wpa_printf(MSG_DEBUG, "inject_frame for protected frame: %d", ret);
return (ret < 0) ? -1 : 0;
}
int wlantest_inject(struct wlantest *wt, struct wlantest_bss *bss,
struct wlantest_sta *sta, u8 *frame, size_t len,
enum wlantest_inject_protection prot)
{
int ret;
struct ieee80211_hdr *hdr;
u16 fc;
int protectable, protect = 0;
wpa_hexdump(MSG_DEBUG, "Inject frame", frame, len);
if (wt->monitor_sock < 0) {
wpa_printf(MSG_INFO, "Cannot inject frames when monitor "
"interface is not in use");
return -1;
}
if (prot != WLANTEST_INJECT_UNPROTECTED && bss == NULL) {
wpa_printf(MSG_INFO, "No BSS information to inject "
"protected frames");
return -1;
}
hdr = (struct ieee80211_hdr *) frame;
fc = le_to_host16(hdr->frame_control);
protectable = WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA ||
is_robust_mgmt(frame, len);
if ((prot == WLANTEST_INJECT_PROTECTED ||
prot == WLANTEST_INJECT_INCORRECT_KEY) && bss) {
if (!sta &&
((WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
!bss->igtk_set[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 "
MACSTR " to protect the injected "
"frame", MAC2STR(bss->bssid));
return -1;
}
if (sta && !sta->ptk_set) {
wpa_printf(MSG_INFO, "No PTK known for the STA " MACSTR
" to encrypt the injected frame",
MAC2STR(sta->addr));
return -1;
}
protect = 1;
} else if (protectable && prot != WLANTEST_INJECT_UNPROTECTED && bss) {
if (sta && sta->ptk_set)
protect = 1;
else if (!sta) {
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
bss->gtk_len[bss->gtk_idx])
protect = 1;
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
bss->igtk_set[bss->igtk_idx])
protect = 1;
}
}
if (protect && bss)
return wlantest_inject_prot(
wt, bss, sta, frame, len,
prot == WLANTEST_INJECT_INCORRECT_KEY);
ret = inject_frame(wt->monitor_sock, frame, len);
wpa_printf(MSG_DEBUG, "inject_frame for unprotected frame: %d", ret);
return (ret < 0) ? -1 : 0;
}
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