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Message-Id: <20180223145742.25783-1-insafonov@gmail.com>
Date: Fri, 23 Feb 2018 17:57:42 +0300
From: Ivan Safonov <insafonov@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
Janani Sankara Babu <jananis37@...il.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
Ivan Safonov <insafonov@...il.com>
Subject: [PATCH] staging:r8188eu: use lib80211 CCMP decrypt
Custom AES decrypt implementation replaced with lib80211 library.
Signed-off-by: Ivan Safonov <insafonov@...il.com>
---
drivers/staging/rtl8188eu/Kconfig | 1 +
drivers/staging/rtl8188eu/core/rtw_security.c | 266 +++++---------------------
2 files changed, 51 insertions(+), 216 deletions(-)
diff --git a/drivers/staging/rtl8188eu/Kconfig b/drivers/staging/rtl8188eu/Kconfig
index d787a091d3c1..ff7832798a77 100644
--- a/drivers/staging/rtl8188eu/Kconfig
+++ b/drivers/staging/rtl8188eu/Kconfig
@@ -6,6 +6,7 @@ config R8188EU
select WEXT_PRIV
select LIB80211
select LIB80211_CRYPT_WEP
+ select LIB80211_CRYPT_CCMP
---help---
This option adds the Realtek RTL8188EU USB device such as TP-Link TL-WN725N.
If built as a module, it will be called r8188eu.
diff --git a/drivers/staging/rtl8188eu/core/rtw_security.c b/drivers/staging/rtl8188eu/core/rtw_security.c
index 72da86fdd264..68e2c6790ee6 100644
--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -1275,217 +1275,24 @@ u32 rtw_aes_encrypt(struct adapter *padapter, u8 *pxmitframe)
return res;
}
-static int aes_decipher(u8 *key, uint hdrlen,
- u8 *pframe, uint plen)
+u32 rtw_aes_decrypt(struct adapter *padapter, u8 *precvframe)
{
- static u8 message[MAX_MSG_SIZE];
- uint qc_exists, a4_exists, i, j, payload_remainder,
- num_blocks, payload_index;
- int res = _SUCCESS;
-
- u8 pn_vector[6];
- u8 mic_iv[16];
- u8 mic_header1[16];
- u8 mic_header2[16];
- u8 ctr_preload[16];
-
- /* Intermediate Buffers */
- u8 chain_buffer[16];
- u8 aes_out[16];
- u8 padded_buffer[16];
- u8 mic[8];
-
-/* uint offset = 0; */
- uint frtype = GetFrameType(pframe);
- uint frsubtype = GetFrameSubType(pframe);
- frsubtype >>= 4;
-
- memset(mic_iv, 0, 16);
- memset(mic_header1, 0, 16);
- memset(mic_header2, 0, 16);
- memset(ctr_preload, 0, 16);
- memset(chain_buffer, 0, 16);
- memset(aes_out, 0, 16);
- memset(padded_buffer, 0, 16);
-
- /* start to decrypt the payload */
-
- num_blocks = (plen-8) / 16; /* plen including llc, payload_length and mic) */
-
- payload_remainder = (plen-8) % 16;
-
- pn_vector[0] = pframe[hdrlen];
- pn_vector[1] = pframe[hdrlen+1];
- pn_vector[2] = pframe[hdrlen+4];
- pn_vector[3] = pframe[hdrlen+5];
- pn_vector[4] = pframe[hdrlen+6];
- pn_vector[5] = pframe[hdrlen+7];
-
- if ((hdrlen == WLAN_HDR_A3_LEN) || (hdrlen == WLAN_HDR_A3_QOS_LEN))
- a4_exists = 0;
- else
- a4_exists = 1;
-
- if ((frtype == WIFI_DATA_CFACK) || (frtype == WIFI_DATA_CFPOLL) ||
- (frtype == WIFI_DATA_CFACKPOLL)) {
- qc_exists = 1;
- if (hdrlen != WLAN_HDR_A3_QOS_LEN)
- hdrlen += 2;
- } else if ((frsubtype == 0x08) || (frsubtype == 0x09) ||
- (frsubtype == 0x0a) || (frsubtype == 0x0b)) {
- if (hdrlen != WLAN_HDR_A3_QOS_LEN)
- hdrlen += 2;
- qc_exists = 1;
- } else {
- qc_exists = 0;
- }
-
- /* now, decrypt pframe with hdrlen offset and plen long */
-
- payload_index = hdrlen + 8; /* 8 is for extiv */
-
- for (i = 0; i < num_blocks; i++) {
- construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, i+1);
-
- aes128k128d(key, ctr_preload, aes_out);
- bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
-
- for (j = 0; j < 16; j++)
- pframe[payload_index++] = chain_buffer[j];
- }
-
- if (payload_remainder > 0) { /* If there is a short final block, then pad it,*/
- /* encrypt it and copy the unpadded part back */
- construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, num_blocks+1);
-
- for (j = 0; j < 16; j++)
- padded_buffer[j] = 0x00;
- for (j = 0; j < payload_remainder; j++)
- padded_buffer[j] = pframe[payload_index+j];
- aes128k128d(key, ctr_preload, aes_out);
- bitwise_xor(aes_out, padded_buffer, chain_buffer);
- for (j = 0; j < payload_remainder; j++)
- pframe[payload_index++] = chain_buffer[j];
- }
-
- /* start to calculate the mic */
- if ((hdrlen+plen+8) <= MAX_MSG_SIZE)
- memcpy(message, pframe, (hdrlen + plen+8)); /* 8 is for ext iv len */
-
- pn_vector[0] = pframe[hdrlen];
- pn_vector[1] = pframe[hdrlen+1];
- pn_vector[2] = pframe[hdrlen+4];
- pn_vector[3] = pframe[hdrlen+5];
- pn_vector[4] = pframe[hdrlen+6];
- pn_vector[5] = pframe[hdrlen+7];
- construct_mic_iv(mic_iv, qc_exists, a4_exists, message, plen-8, pn_vector);
-
- construct_mic_header1(mic_header1, hdrlen, message);
- construct_mic_header2(mic_header2, message, a4_exists, qc_exists);
-
- payload_remainder = (plen-8) % 16;
- num_blocks = (plen-8) / 16;
-
- /* Find start of payload */
- payload_index = hdrlen + 8;
-
- /* Calculate MIC */
- aes128k128d(key, mic_iv, aes_out);
- bitwise_xor(aes_out, mic_header1, chain_buffer);
- aes128k128d(key, chain_buffer, aes_out);
- bitwise_xor(aes_out, mic_header2, chain_buffer);
- aes128k128d(key, chain_buffer, aes_out);
-
- for (i = 0; i < num_blocks; i++) {
- bitwise_xor(aes_out, &message[payload_index], chain_buffer);
-
- payload_index += 16;
- aes128k128d(key, chain_buffer, aes_out);
- }
-
- /* Add on the final payload block if it needs padding */
- if (payload_remainder > 0) {
- for (j = 0; j < 16; j++)
- padded_buffer[j] = 0x00;
- for (j = 0; j < payload_remainder; j++)
- padded_buffer[j] = message[payload_index++];
- bitwise_xor(aes_out, padded_buffer, chain_buffer);
- aes128k128d(key, chain_buffer, aes_out);
- }
-
- for (j = 0 ; j < 8; j++)
- mic[j] = aes_out[j];
-
- /* Insert MIC into payload */
- for (j = 0; j < 8; j++)
- message[payload_index+j] = mic[j];
-
- payload_index = hdrlen + 8;
- for (i = 0; i < num_blocks; i++) {
- construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, i+1);
- aes128k128d(key, ctr_preload, aes_out);
- bitwise_xor(aes_out, &message[payload_index], chain_buffer);
- for (j = 0; j < 16; j++)
- message[payload_index++] = chain_buffer[j];
- }
-
- if (payload_remainder > 0) { /* If there is a short final block, then pad it,*/
- /* encrypt it and copy the unpadded part back */
- construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, num_blocks+1);
-
- for (j = 0; j < 16; j++)
- padded_buffer[j] = 0x00;
- for (j = 0; j < payload_remainder; j++)
- padded_buffer[j] = message[payload_index+j];
- aes128k128d(key, ctr_preload, aes_out);
- bitwise_xor(aes_out, padded_buffer, chain_buffer);
- for (j = 0; j < payload_remainder; j++)
- message[payload_index++] = chain_buffer[j];
- }
-
- /* Encrypt the MIC */
- construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, 0);
-
- for (j = 0; j < 16; j++)
- padded_buffer[j] = 0x00;
- for (j = 0; j < 8; j++)
- padded_buffer[j] = message[j+hdrlen+8+plen-8];
-
- aes128k128d(key, ctr_preload, aes_out);
- bitwise_xor(aes_out, padded_buffer, chain_buffer);
- for (j = 0; j < 8; j++)
- message[payload_index++] = chain_buffer[j];
-
- /* compare the mic */
- for (i = 0; i < 8; i++) {
- if (pframe[hdrlen+8+plen-8+i] != message[hdrlen+8+plen-8+i]) {
- RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
- ("aes_decipher:mic check error mic[%d]: pframe(%x)!=message(%x)\n",
- i, pframe[hdrlen+8+plen-8+i], message[hdrlen+8+plen-8+i]));
- DBG_88E("aes_decipher:mic check error mic[%d]: pframe(%x)!=message(%x)\n",
- i, pframe[hdrlen+8+plen-8+i], message[hdrlen+8+plen-8+i]);
- res = _FAIL;
- }
- }
- return res;
-}
-
-u32 rtw_aes_decrypt(struct adapter *padapter, u8 *precvframe)
-{ /* exclude ICV */
- /* Intermediate Buffers */
- int length;
- u8 *pframe, *prwskey; /* *payload,*iv */
- struct sta_info *stainfo;
- struct rx_pkt_attrib *prxattrib = &((struct recv_frame *)precvframe)->attrib;
- struct security_priv *psecuritypriv = &padapter->securitypriv;
- u32 res = _SUCCESS;
+ struct rx_pkt_attrib *prxattrib = &((struct recv_frame *)precvframe)->attrib;
+ u32 res = _SUCCESS;
- pframe = (unsigned char *)((struct recv_frame *)precvframe)->pkt->data;
/* 4 start to encrypt each fragment */
if (prxattrib->encrypt == _AES_) {
- stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
+ struct sta_info *stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
+
if (stainfo != NULL) {
- RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("rtw_aes_decrypt: stainfo!= NULL!!!\n"));
+ int key_idx;
+ const int key_length = 16, iv_len = 8, icv_len = 8;
+ struct sk_buff *skb = ((struct recv_frame *)precvframe)->pkt;
+ void *crypto_private = NULL;
+ u8 *key, *pframe = skb->data;
+ struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("CCMP"), "lib80211_crypt_ccmp");
+ struct security_priv *psecuritypriv = &padapter->securitypriv;
+ char iv[8], icv[8];
if (IS_MCAST(prxattrib->ra)) {
/* in concurrent we should use sw descrypt in group key, so we remove this message */
@@ -1494,18 +1301,45 @@ u32 rtw_aes_decrypt(struct adapter *padapter, u8 *precvframe)
DBG_88E("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
goto exit;
}
- prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
- if (psecuritypriv->dot118021XGrpKeyid != prxattrib->key_index) {
- DBG_88E("not match packet_index=%d, install_index=%d\n",
- prxattrib->key_index, psecuritypriv->dot118021XGrpKeyid);
- res = _FAIL;
- goto exit;
- }
+ key_idx = psecuritypriv->dot118021XGrpKeyid;
+ key = psecuritypriv->dot118021XGrpKey[key_idx].skey;
} else {
- prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+ key_idx = 0;
+ key = stainfo->dot118021x_UncstKey.skey;
}
- length = ((struct recv_frame *)precvframe)->pkt->len-prxattrib->hdrlen-prxattrib->iv_len;
- res = aes_decipher(prwskey, prxattrib->hdrlen, pframe, length);
+
+ if (!crypto_ops) {
+ res = _FAIL;
+ goto exit_lib80211_ccmp;
+ }
+
+ memcpy(iv, pframe + prxattrib->hdrlen, iv_len);
+ memcpy(icv, pframe + skb->len - icv_len, icv_len);
+
+ crypto_private = crypto_ops->init(key_idx);
+ if (!crypto_private) {
+ res = _FAIL;
+ goto exit_lib80211_ccmp;
+ }
+ if (crypto_ops->set_key(key, key_length, NULL, crypto_private) < 0) {
+ res = _FAIL;
+ goto exit_lib80211_ccmp;
+ }
+ if (crypto_ops->decrypt_mpdu(skb, prxattrib->hdrlen, crypto_private)) {
+ res = _FAIL;
+ goto exit_lib80211_ccmp;
+ }
+
+ memmove(pframe, pframe + iv_len, prxattrib->hdrlen);
+ skb_push(skb, iv_len);
+ skb_put(skb, icv_len);
+
+ memcpy(pframe + prxattrib->hdrlen, iv, iv_len);
+ memcpy(pframe + skb->len - icv_len, icv, icv_len);
+
+exit_lib80211_ccmp:
+ if (crypto_ops && crypto_private)
+ crypto_ops->deinit(crypto_private);
} else {
RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("rtw_aes_encrypt: stainfo==NULL!!!\n"));
res = _FAIL;
--
2.16.1
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