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[PATCH] softmac: complete shared key authentication

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This patch finishes of the partially-complete shared key authentication
implementation in softmac.

The complication here is that we need to encrypt a management frame during
the authentication process. I don't think there are any other scenarios where
this would have to happen.

To get around this without causing too many headaches, we decided to just use
software encryption for this frame. The softmac config option now selects
IEEE80211_CRYPT_WEP so that we can ensure this available. This also involved
a modification to some otherwise unused ieee80211 API.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Drake
2006-06-01 15:34:26 +01:00
committed by John W. Linville
parent 47fbe1bf39
commit 76ea4c7f4c
5 changed files with 51 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
net/ieee80211/softmac/Kconfig
View File

@@ -2,6 +2,7 @@ config IEEE80211_SOFTMAC
tristate "Software MAC add-on to the IEEE 802.11 networking stack"
depends on IEEE80211 && EXPERIMENTAL
select WIRELESS_EXT
select IEEE80211_CRYPT_WEP
---help---
This option enables the hardware independent software MAC addon
for the IEEE 802.11 networking stack.

12
net/ieee80211/softmac/ieee80211softmac_auth.c
View File

@@ -107,6 +107,7 @@ ieee80211softmac_auth_queue(void *data)
printkl(KERN_WARNING PFX "Authentication timed out with "MAC_FMT"\n", MAC_ARG(net->bssid));
/* Remove this item from the queue */
spin_lock_irqsave(&mac->lock, flags);
net->authenticating = 0;
ieee80211softmac_call_events_locked(mac, IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT, net);
cancel_delayed_work(&auth->work); /* just to make sure... */
list_del(&auth->list);
@@ -212,13 +213,13 @@ ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth)
aq->state = IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE;
spin_unlock_irqrestore(&mac->lock, flags);
/* Switch to correct channel for this network */
mac->set_channel(mac->dev, net->channel);
/* Send our response (How to encrypt?) */
/* Send our response */
ieee80211softmac_send_mgt_frame(mac, aq->net, IEEE80211_STYPE_AUTH, aq->state);
break;
return 0;
case IEEE80211SOFTMAC_AUTH_SHARED_PASS:
kfree(net->challenge);
net->challenge = NULL;
net->challenge_len = 0;
/* Check the status code of the response */
switch(auth->status) {
case WLAN_STATUS_SUCCESS:
@@ -229,6 +230,7 @@ ieee80211softmac_auth_resp(struct net_device *dev, struct ieee80211_auth *auth)
spin_unlock_irqrestore(&mac->lock, flags);
printkl(KERN_NOTICE PFX "Shared Key Authentication completed with "MAC_FMT"\n",
MAC_ARG(net->bssid));
ieee80211softmac_call_events(mac, IEEE80211SOFTMAC_EVENT_AUTHENTICATED, net);
break;
default:
printkl(KERN_NOTICE PFX "Shared Key Authentication with "MAC_FMT" failed, error code: %i\n",

39
net/ieee80211/softmac/ieee80211softmac_io.c
View File

@@ -268,26 +268,27 @@ ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt,
static u32
ieee80211softmac_auth(struct ieee80211_auth **pkt,
struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
u16 transaction, u16 status)
u16 transaction, u16 status, int *encrypt_mpdu)
{
u8 *data;
int auth_mode = mac->ieee->sec.auth_mode;
int is_shared_response = (auth_mode == WLAN_AUTH_SHARED_KEY
&& transaction == IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE);
/* Allocate Packet */
(*pkt) = (struct ieee80211_auth *)ieee80211softmac_alloc_mgt(
2 + /* Auth Algorithm */
2 + /* Auth Transaction Seq */
2 + /* Status Code */
/* Challenge Text IE */
mac->ieee->open_wep ? 0 :
1 + 1 + WLAN_AUTH_CHALLENGE_LEN
);
is_shared_response ? 0 : 1 + 1 + net->challenge_len
);
if (unlikely((*pkt) == NULL))
return 0;
ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);
/* Algorithm */
(*pkt)->algorithm = mac->ieee->open_wep ?
cpu_to_le16(WLAN_AUTH_OPEN) :
cpu_to_le16(WLAN_AUTH_SHARED_KEY);
(*pkt)->algorithm = cpu_to_le16(auth_mode);
/* Transaction */
(*pkt)->transaction = cpu_to_le16(transaction);
/* Status */
@@ -295,18 +296,20 @@ ieee80211softmac_auth(struct ieee80211_auth **pkt,
data = (u8 *)(*pkt)->info_element;
/* Challenge Text */
if(!mac->ieee->open_wep){
if (is_shared_response) {
*data = MFIE_TYPE_CHALLENGE;
data++;
/* Copy the challenge in */
// *data = challenge length
// data += sizeof(u16);
// memcpy(data, challenge, challenge length);
// data += challenge length;
/* Add the full size to the packet length */
}
*data = net->challenge_len;
data++;
memcpy(data, net->challenge, net->challenge_len);
data += net->challenge_len;
/* Make sure this frame gets encrypted with the shared key */
*encrypt_mpdu = 1;
} else
*encrypt_mpdu = 0;
/* Return the packet size */
return (data - (u8 *)(*pkt));
@@ -396,6 +399,7 @@ ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
{
void *pkt = NULL;
u32 pkt_size = 0;
int encrypt_mpdu = 0;
switch(type) {
case IEEE80211_STYPE_ASSOC_REQ:
@@ -405,7 +409,7 @@ ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
break;
case IEEE80211_STYPE_AUTH:
pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16));
pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16), &encrypt_mpdu);
break;
case IEEE80211_STYPE_DISASSOC:
case IEEE80211_STYPE_DEAUTH:
@@ -434,7 +438,8 @@ ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
* or get rid of it alltogether?
* Does this work for you now?
*/
ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt, pkt_size);
ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt,
IEEE80211_3ADDR_LEN, pkt_size, encrypt_mpdu);
kfree(pkt);
return 0;