pn[4] = data[1]; /* PN1 */
pn[5] = data[0]; /* PN0 */
}
+
+
+u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
+ u8 *pn, int keyid, size_t *encrypted_len)
+{
+ u8 aad[2 + 30], nonce[13];
+ size_t aad_len;
+ u8 b[AES_BLOCK_SIZE], x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
+ void *aes;
+ u8 *crypt, *pos, *ppos, *mpos;
+ size_t plen, last;
+ struct ieee80211_hdr *hdr;
+ int i;
+
+ if (len < hdrlen || hdrlen < 24)
+ return NULL;
+ plen = len - hdrlen;
+ last = plen % AES_BLOCK_SIZE;
+
+ crypt = os_malloc(hdrlen + 8 + plen + 8);
+ if (crypt == NULL)
+ return NULL;
+
+ os_memcpy(crypt, frame, hdrlen);
+ hdr = (struct ieee80211_hdr *) crypt;
+ hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
+ pos = crypt + hdrlen;
+ *pos++ = pn[5]; /* PN0 */
+ *pos++ = pn[4]; /* PN1 */
+ *pos++ = 0x20 | (keyid << 6);
+ *pos++ = pn[3]; /* PN2 */
+ *pos++ = pn[2]; /* PN3 */
+ *pos++ = pn[1]; /* PN4 */
+ *pos++ = pn[0]; /* PN5 */
+
+ aes = aes_encrypt_init(tk, 16);
+ if (aes == NULL) {
+ os_free(crypt);
+ return NULL;
+ }
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce(hdr, crypt + hdrlen, &aad[2], &aad_len, nonce);
+ WPA_PUT_BE16(aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", &aad[2], aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
+
+ /* Authentication */
+ /* B_0: Flags | Nonce N | l(m) */
+ b[0] = 0x40 /* Adata */ | (3 /* M' */ << 3) | 1 /* L' */;
+ os_memcpy(&b[1], nonce, 13);
+ WPA_PUT_BE16(&b[14], plen);
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP B_0", b, AES_BLOCK_SIZE);
+ aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP B_1", aad, AES_BLOCK_SIZE);
+ xor_aes_block(aad, x);
+ aes_encrypt(aes, aad, x); /* X_2 = E(K, X_1 XOR B_1) */
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP B_2", &aad[AES_BLOCK_SIZE],
+ AES_BLOCK_SIZE);
+ xor_aes_block(&aad[AES_BLOCK_SIZE], x);
+ aes_encrypt(aes, &aad[AES_BLOCK_SIZE], x); /* X_3 = E(K, X_2 XOR B_2)
+ */
+
+ ppos = frame + hdrlen;
+ for (i = 0; i < plen / AES_BLOCK_SIZE; i++) {
+ /* X_i+1 = E(K, X_i XOR B_i) */
+ xor_aes_block(x, ppos);
+ ppos += AES_BLOCK_SIZE;
+ aes_encrypt(aes, x, x);
+ }
+ if (last) {
+ /* XOR zero-padded last block */
+ for (i = 0; i < last; i++)
+ x[i] ^= *ppos++;
+ aes_encrypt(aes, x, x);
+ }
+
+ /* Encryption */
+
+ /* CCM: M=8 L=2, Adata=1, M' = (M-2)/2 = 3, L' = L-1 = 1 */
+
+ /* A_i = Flags | Nonce N | Counter i */
+ a[0] = 0x01; /* Flags = L' */
+ os_memcpy(&a[1], nonce, 13);
+
+ ppos = crypt + hdrlen + 8;
+
+ /* crypt = msg XOR (S_1 | S_2 | ... | S_n) */
+ mpos = frame + hdrlen;
+ for (i = 1; i <= plen / AES_BLOCK_SIZE; i++) {
+ WPA_PUT_BE16(&a[14], i);
+ /* S_i = E(K, A_i) */
+ aes_encrypt(aes, a, ppos);
+ xor_aes_block(ppos, mpos);
+ ppos += AES_BLOCK_SIZE;
+ mpos += AES_BLOCK_SIZE;
+ }
+ if (last) {
+ WPA_PUT_BE16(&a[14], i);
+ aes_encrypt(aes, a, ppos);
+ /* XOR zero-padded last block */
+ for (i = 0; i < last; i++)
+ *ppos++ ^= *mpos++;
+ }
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP T", x, 8);
+ /* U = T XOR S_0; S_0 = E(K, A_0) */
+ WPA_PUT_BE16(&a[14], 0);
+ aes_encrypt(aes, a, b);
+ for (i = 0; i < 8; i++)
+ ppos[i] = x[i] ^ b[i];
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP U", ppos, 8);
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen + 8, plen);
+
+ aes_encrypt_deinit(aes);
+
+ *encrypted_len = hdrlen + 8 + plen + 8;
+
+ return crypt;
+}
#include "utils/includes.h"
#include "utils/common.h"
+#include "common/defs.h"
+#include "common/ieee802_11_defs.h"
#include "wlantest.h"
}
+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_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;
+
+ if (sta == NULL)
+ return -1; /* TODO: add support for group Data and BIP */
+
+ if (!sta->ptk_set)
+ return -1;
+
+ hdr = (struct ieee80211_hdr *) frame;
+ hdrlen = 24;
+ fc = le_to_host16(hdr->frame_control);
+ 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 (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 (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)
+ return -1;
+
+ ret = inject_frame(wt->monitor_sock, crypt, crypt_len);
+ os_free(crypt);
+
+ 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) {
return -1;
}
- /* TODO: encrypt if needed */
- if (prot != WLANTEST_INJECT_UNPROTECTED)
+ 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) {
+ if (!sta) {
+ wpa_printf(MSG_INFO, "Broadcast protection not yet "
+ "implemented");
+ 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) {
+ if (sta && sta->ptk_set)
+ protect = 1;
+ else if (!sta) {
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
+ (bss->gtk_len[1] || bss->gtk_len[2]))
+ protect = 1;
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
+ (bss->igtk_set[4] || bss->igtk_set[5]))
+ protect = 1;
+ }
+ }
+
+ if ((prot == WLANTEST_INJECT_PROTECTED ||
+ prot == WLANTEST_INJECT_INCORRECT_KEY) && !protect) {
+ wpa_printf(MSG_INFO, "Cannot protect injected frame");
return -1;
+ }
+
+ if (protect)
+ return wlantest_inject_prot(
+ wt, bss, sta, frame, len,
+ prot == WLANTEST_INJECT_INCORRECT_KEY);
ret = inject_frame(wt->monitor_sock, frame, len);
return (ret < 0) ? -1 : 0;
pn[4] = data[0]; /* PN1 */
pn[5] = data[2]; /* PN0 */
}
+
+
+u8 * tkip_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
+ u8 *pn, int keyid, size_t *encrypted_len)
+{
+ /* TODO */
+ return NULL;
+}
u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, size_t *decrypted_len);
+u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
+ u8 *pn, int keyid, size_t *encrypted_len);
void ccmp_get_pn(u8 *pn, const u8 *data);
u8 * tkip_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, size_t *decrypted_len);
+u8 * tkip_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
+ u8 *pn, int keyid, size_t *encrypted_len);
void tkip_get_pn(u8 *pn, const u8 *data);
int ctrl_init(struct wlantest *wt);
projects / thirdparty / hostap.git / commitdiff
