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wiphy: select TKIP if CCMP not supported

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If AP does not support CCMP, or if the wiphy does not.
This commit is contained in:
Andrew Zaborowski 2015-05-18 13:31:40 +02:00 committed by Denis Kenzior
parent a84d232eb1
commit 0293b62f2e
1 changed files with 90 additions and 13 deletions
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103
src/wiphy.c
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@ -83,6 +83,8 @@ struct netdev {
uint32_t pairwise_new_key_cmd_id;
uint32_t pairwise_set_key_cmd_id;
uint32_t group_new_key_cmd_id;
struct wiphy *wiphy;
};
struct wiphy {
@ -297,6 +299,21 @@ static void passphrase_callback(enum agent_result result,
mlme_authenticate_cmd(network);
}
static enum ie_rsn_cipher_suite wiphy_select_cipher(struct wiphy *wiphy,
uint16_t mask)
{
mask &= wiphy->pairwise_ciphers;
/* CCMP is our first choice, TKIP second */
if (mask & IE_RSN_CIPHER_SUITE_CCMP)
return IE_RSN_CIPHER_SUITE_CCMP;
if (mask & IE_RSN_CIPHER_SUITE_TKIP)
return IE_RSN_CIPHER_SUITE_TKIP;
return 0;
}
static struct l_dbus_message *network_connect_psk(struct network *network,
struct l_dbus_message *message)
{
@ -953,9 +970,11 @@ static void wiphy_set_tk(uint32_t ifindex, const uint8_t *aa,
{
struct netdev *netdev = user_data;
struct network *network = netdev->connected_network;
struct wiphy *wiphy = netdev->wiphy;
struct ie_rsn_info info;
enum crypto_cipher cipher;
int result;
uint8_t tk_buf[32];
l_debug("");
@ -972,9 +991,27 @@ static void wiphy_set_tk(uint32_t ifindex, const uint8_t *aa,
return;
}
switch (info.pairwise_ciphers) {
switch (wiphy_select_cipher(wiphy, info.pairwise_ciphers)) {
case IE_RSN_CIPHER_SUITE_CCMP:
cipher = CRYPTO_CIPHER_CCMP;
memcpy(tk_buf, tk, 16);
break;
case IE_RSN_CIPHER_SUITE_TKIP:
cipher = CRYPTO_CIPHER_TKIP;
/*
* Swap the TX and RX MIC key portions for supplicant.
* WPA_80211_v3_1_090922 doc's 3.3.4:
* The MIC key used on the Client for transmit (TX) is in
* bytes 24-31, and the MIC key used on the Client for
* receive (RX) is in bytes 16-23 of the PTK. That is,
* assume that TX MIC and RX MIC referred to in Clause 8.7
* are referenced to the Authenticator. Similarly, on the AP,
* the MIC used for TX is in bytes 16-23, and the MIC key
* used for RX is in bytes 24-31 of the PTK.
*/
memcpy(tk_buf, tk, 16);
memcpy(tk_buf + 16, tk + 24, 8);
memcpy(tk_buf + 24, tk + 16, 8);
break;
default:
l_error("Unexpected cipher suite: %d", info.pairwise_ciphers);
@ -997,7 +1034,7 @@ static void wiphy_set_tk(uint32_t ifindex, const uint8_t *aa,
netdev->pairwise_new_key_cmd_id =
mlme_new_pairwise_key(netdev, cipher, aa,
tk, crypto_cipher_key_len(cipher));
tk_buf, crypto_cipher_key_len(cipher));
netdev->pairwise_set_key_cmd_id = mlme_set_pairwise_key(netdev);
}
@ -1112,6 +1149,7 @@ static void wiphy_set_gtk(uint32_t ifindex, uint8_t key_index,
struct ie_rsn_info info;
enum crypto_cipher cipher;
int result;
uint8_t gtk_buf[32];
l_debug("");
@ -1131,6 +1169,26 @@ static void wiphy_set_gtk(uint32_t ifindex, uint8_t key_index,
switch (info.group_cipher) {
case IE_RSN_CIPHER_SUITE_CCMP:
cipher = CRYPTO_CIPHER_CCMP;
memcpy(gtk_buf, gtk, 16);
break;
case IE_RSN_CIPHER_SUITE_TKIP:
cipher = CRYPTO_CIPHER_TKIP;
/*
* Swap the TX and RX MIC key portions for supplicant.
* WPA_80211_v3_1_090922 doc's 3.3.4:
* The MIC key used on the Client for transmit (TX) is in
* bytes 24-31, and the MIC key used on the Client for
* receive (RX) is in bytes 16-23 of the PTK. That is,
* assume that TX MIC and RX MIC referred to in Clause 8.7
* are referenced to the Authenticator. Similarly, on the AP,
* the MIC used for TX is in bytes 16-23, and the MIC key
* used for RX is in bytes 24-31 of the PTK.
*
* Here apply this to the GTK instead of the PTK.
*/
memcpy(gtk_buf, gtk, 16);
memcpy(gtk_buf + 16, gtk + 24, 8);
memcpy(gtk_buf + 24, gtk + 16, 8);
break;
default:
l_error("Unexpected cipher suite: %d", info.group_cipher);
@ -1148,8 +1206,7 @@ static void wiphy_set_gtk(uint32_t ifindex, uint8_t key_index,
netdev->group_new_key_cmd_id =
mlme_new_group_key(netdev, cipher, key_index,
gtk, crypto_cipher_key_len(cipher),
rsc, rsc_len);
gtk_buf, gtk_len, rsc, rsc_len);
}
static void mlme_associate_event(struct l_genl_msg *msg, struct netdev *netdev)
@ -1189,6 +1246,7 @@ static void mlme_associate_cmd(struct netdev *netdev)
struct l_genl_msg *msg;
struct scan_bss *bss = netdev->connected_bss;
struct network *network = netdev->connected_network;
struct wiphy *wiphy = netdev->wiphy;
l_debug("");
@ -1200,16 +1258,32 @@ static void mlme_associate_cmd(struct netdev *netdev)
network->ssid);
if (network->ssid_security == SCAN_SSID_SECURITY_PSK) {
uint32_t ccmp = 0x000fac04;
uint16_t pairwise_ciphers, group_ciphers;
uint32_t pairwise_cipher_attr;
uint32_t group_cipher_attr;
uint8_t rsne_buf[256];
struct ie_rsn_info info;
struct eapol_sm *sm = eapol_sm_new();
memset(&info, 0, sizeof(info));
info.group_cipher = IE_RSN_CIPHER_SUITE_CCMP;
info.pairwise_ciphers = IE_RSN_CIPHER_SUITE_CCMP;
info.akm_suites = IE_RSN_AKM_SUITE_PSK;
bss_get_supported_ciphers(bss, &pairwise_ciphers,
&group_ciphers);
info.pairwise_ciphers = wiphy_select_cipher(wiphy,
pairwise_ciphers);
if (info.pairwise_ciphers == IE_RSN_CIPHER_SUITE_CCMP)
pairwise_cipher_attr = CRYPTO_CIPHER_CCMP;
else
pairwise_cipher_attr = CRYPTO_CIPHER_TKIP;
info.group_cipher = wiphy_select_cipher(wiphy, group_ciphers);
if (info.group_cipher == IE_RSN_CIPHER_SUITE_CCMP)
group_cipher_attr = CRYPTO_CIPHER_CCMP;
else
group_cipher_attr = CRYPTO_CIPHER_TKIP;
/* RSN takes priority */
if (bss->rsne) {
ie_build_rsne(&info, rsne_buf);
@ -1231,9 +1305,10 @@ static void mlme_associate_cmd(struct netdev *netdev)
eapol_start(netdev->index, sm);
msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE,
4, &ccmp);
4, &pairwise_cipher_attr);
msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITE_GROUP,
4, &ccmp);
4, &group_cipher_attr);
msg_append_attr(msg, NL80211_ATTR_CONTROL_PORT, 0, NULL);
msg_append_attr(msg, NL80211_ATTR_IE,
rsne_buf[1] + 2, rsne_buf);
@ -1637,10 +1712,6 @@ static void interface_dump_callback(struct l_genl_msg *msg, void *user_data)
wiphy = l_queue_find(wiphy_list, wiphy_match,
L_UINT_TO_PTR(*((uint32_t *) data)));
if (!wiphy) {
l_warn("No wiphy structure found");
return;
}
break;
case NL80211_ATTR_IFTYPE:
@ -1663,6 +1734,11 @@ static void interface_dump_callback(struct l_genl_msg *msg, void *user_data)
}
}
if (!wiphy) {
l_warn("Missing wiphy attribute or wiphy not found");
return;
}
if (!ifindex) {
l_warn("Missing interface index attribute");
return;
@ -1683,6 +1759,7 @@ static void interface_dump_callback(struct l_genl_msg *msg, void *user_data)
memcpy(netdev->addr, ifaddr, sizeof(netdev->addr));
netdev->index = ifindex;
netdev->type = iftype;
netdev->wiphy = wiphy;
l_queue_push_head(wiphy->netdev_list, netdev);