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/*
* wpa_supplicant - WPA/RSN IE and KDE processing
* Copyright (c) 2003-2018, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "wpa.h"
#include "pmksa_cache.h"
#include "common/ieee802_11_defs.h"
#include "wpa_i.h"
#include "wpa_ie.h"
/**
* wpa_parse_wpa_ie - Parse WPA/RSN IE
* @wpa_ie: Pointer to WPA or RSN IE
* @wpa_ie_len: Length of the WPA/RSN IE
* @data: Pointer to data area for parsing results
* Returns: 0 on success, -1 on failure
*
* Parse the contents of WPA or RSN IE and write the parsed data into data.
*/
int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
struct wpa_ie_data *data)
{
if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC &&
wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE)
return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
else
return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
}
static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
int pairwise_cipher, int group_cipher,
int key_mgmt)
{
u8 *pos;
struct wpa_ie_hdr *hdr;
u32 suite;
if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
return -1;
hdr = (struct wpa_ie_hdr *) wpa_ie;
hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
WPA_PUT_LE16(hdr->version, WPA_VERSION);
pos = (u8 *) (hdr + 1);
suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
if (suite == 0) {
wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
group_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += WPA_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
if (suite == 0 ||
(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
pairwise_cipher != WPA_CIPHER_NONE)) {
wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
pairwise_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += WPA_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
} else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
} else {
wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
key_mgmt);
return -1;
}
pos += WPA_SELECTOR_LEN;
/* WPA Capabilities; use defaults, so no need to include it */
hdr->len = (pos - wpa_ie) - 2;
WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
return pos - wpa_ie;
}
u16 rsn_supp_capab(struct wpa_sm *sm)
{
u16 capab = 0;
if (sm->mfp)
capab |= WPA_CAPABILITY_MFPC;
if (sm->mfp == 2)
capab |= WPA_CAPABILITY_MFPR;
if (sm->ocv)
capab |= WPA_CAPABILITY_OCVC;
if (sm->ext_key_id)
capab |= WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST;
return capab;
}
static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
int pairwise_cipher, int group_cipher,
int key_mgmt, int mgmt_group_cipher,
struct wpa_sm *sm)
{
u8 *pos;
struct rsn_ie_hdr *hdr;
u32 suite;
if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
(sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
(unsigned long) rsn_ie_len);
return -1;
}
hdr = (struct rsn_ie_hdr *) rsn_ie;
hdr->elem_id = WLAN_EID_RSN;
WPA_PUT_LE16(hdr->version, RSN_VERSION);
pos = (u8 *) (hdr + 1);
suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
if (suite == 0) {
wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
group_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += RSN_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
if (suite == 0 ||
(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
pairwise_cipher != WPA_CIPHER_NONE)) {
wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
pairwise_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += RSN_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
#ifdef CONFIG_IEEE80211R
} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
#ifdef CONFIG_SHA384
} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
#endif /* CONFIG_SHA384 */
} else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
#endif /* CONFIG_IEEE80211R */
} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
} else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
#ifdef CONFIG_SAE
} else if (key_mgmt == WPA_KEY_MGMT_SAE) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
} else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
#endif /* CONFIG_SAE */
} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
#ifdef CONFIG_FILS
} else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA256);
} else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA384) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA384);
#ifdef CONFIG_IEEE80211R
} else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
} else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
#endif /* CONFIG_IEEE80211R */
#endif /* CONFIG_FILS */
#ifdef CONFIG_OWE
} else if (key_mgmt & WPA_KEY_MGMT_OWE) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OWE);
#endif /* CONFIG_OWE */
#ifdef CONFIG_DPP
} else if (key_mgmt & WPA_KEY_MGMT_DPP) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_DPP);
#endif /* CONFIG_DPP */
#ifdef CONFIG_HS20
} else if (key_mgmt & WPA_KEY_MGMT_OSEN) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
#endif /* CONFIG_HS20 */
} else {
wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
key_mgmt);
return -1;
}
pos += RSN_SELECTOR_LEN;
/* RSN Capabilities */
WPA_PUT_LE16(pos, rsn_supp_capab(sm));
pos += 2;
if (sm->cur_pmksa) {
/* PMKID Count (2 octets, little endian) */
*pos++ = 1;
*pos++ = 0;
/* PMKID */
os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
pos += PMKID_LEN;
}
if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
if (!sm->cur_pmksa) {
/* PMKID Count */
WPA_PUT_LE16(pos, 0);
pos += 2;
}
/* Management Group Cipher Suite */
RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
mgmt_group_cipher));
pos += RSN_SELECTOR_LEN;
}
hdr->len = (pos - rsn_ie) - 2;
WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
return pos - rsn_ie;
}
#ifdef CONFIG_HS20
static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
int pairwise_cipher, int group_cipher,
int key_mgmt)
{
u8 *pos, *len;
u32 suite;
if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
return -1;
pos = wpa_ie;
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
len = pos++; /* to be filled */
WPA_PUT_BE24(pos, OUI_WFA);
pos += 3;
*pos++ = HS20_OSEN_OUI_TYPE;
/* Group Data Cipher Suite */
suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
if (suite == 0) {
wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
group_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += RSN_SELECTOR_LEN;
/* Pairwise Cipher Suite Count and List */
WPA_PUT_LE16(pos, 1);
pos += 2;
suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
if (suite == 0 ||
(!wpa_cipher_valid_pairwise(pairwise_cipher) &&
pairwise_cipher != WPA_CIPHER_NONE)) {
wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
pairwise_cipher);
return -1;
}
RSN_SELECTOR_PUT(pos, suite);
pos += RSN_SELECTOR_LEN;
/* AKM Suite Count and List */
WPA_PUT_LE16(pos, 1);
pos += 2;
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
pos += RSN_SELECTOR_LEN;
*len = pos - len - 1;
WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
return pos - wpa_ie;
}
#endif /* CONFIG_HS20 */
/**
* wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
* @wpa_ie_len: Maximum length of the generated WPA/RSN IE
* Returns: Length of the generated WPA/RSN IE or -1 on failure
*/
int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
{
if (sm->proto == WPA_PROTO_RSN)
return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
sm->pairwise_cipher,
sm->group_cipher,
sm->key_mgmt, sm->mgmt_group_cipher,
sm);
#ifdef CONFIG_HS20
else if (sm->proto == WPA_PROTO_OSEN)
return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
sm->pairwise_cipher,
sm->group_cipher,
sm->key_mgmt);
#endif /* CONFIG_HS20 */
else
return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
sm->pairwise_cipher,
sm->group_cipher,
sm->key_mgmt);
}
int wpa_gen_rsnxe(struct wpa_sm *sm, u8 *rsnxe, size_t rsnxe_len)
{
u8 *pos = rsnxe;
u16 capab = 0;
size_t flen;
if (wpa_key_mgmt_sae(sm->key_mgmt) &&
(sm->sae_pwe == 1 || sm->sae_pwe == 2 || sm->sae_pk)) {
capab |= BIT(WLAN_RSNX_CAPAB_SAE_H2E);
#ifdef CONFIG_SAE_PK
if (sm->sae_pk)
capab |= BIT(WLAN_RSNX_CAPAB_SAE_PK);
#endif /* CONFIG_SAE_PK */
}
if (sm->secure_ltf)
capab |= BIT(WLAN_RSNX_CAPAB_SECURE_LTF);
if (sm->secure_rtt)
capab |= BIT(WLAN_RSNX_CAPAB_SECURE_RTT);
if (sm->prot_range_neg)
capab |= BIT(WLAN_RSNX_CAPAB_PROT_RANGE_NEG);
flen = (capab & 0xff00) ? 2 : 1;
if (!capab)
return 0; /* no supported extended RSN capabilities */
if (rsnxe_len < 2 + flen)
return -1;
capab |= flen - 1; /* bit 0-3 = Field length (n - 1) */
*pos++ = WLAN_EID_RSNX;
*pos++ = flen;
*pos++ = capab & 0x00ff;
capab >>= 8;
if (capab)
*pos++ = capab;
return pos - rsnxe;
}
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