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Add testing functionality for resetting PN/IPN for configured keys

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This can be used to test replay protection. The "RESET_PN" command in
wpa_supplicant and "RESET_PN <addr>" command in hostapd resets the local
counters to zero for the last configured key. For hostapd, the address
parameter specifies which STA this operation is for or selects GTK
("ff:ff:ff:ff:ff:ff") or IGTK ("ff:ff:ff:ff:ff:ff IGTK").

This functionality is for testing purposes and included only in builds
with CONFIG_TESTING_OPTIONS=y.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2017-10-14 13:41:08 +03:00
parent b74f82a4f8
commit 16579769ff
8 changed files with 184 additions and 0 deletions
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87
hostapd/ctrl_iface.c
View file

@ -1949,6 +1949,90 @@ static int hostapd_ctrl_get_fail(struct hostapd_data *hapd,
#endif /* WPA_TRACE_BFD */
}
static int hostapd_ctrl_reset_pn(struct hostapd_data *hapd, const char *cmd)
{
struct sta_info *sta;
u8 addr[ETH_ALEN];
u8 zero[WPA_TK_MAX_LEN];
os_memset(zero, 0, sizeof(zero));
if (hwaddr_aton(cmd, addr))
return -1;
#ifdef CONFIG_IEEE80211W
if (is_broadcast_ether_addr(addr) && os_strstr(cmd, "IGTK")) {
if (hapd->last_igtk_alg == WPA_ALG_NONE)
return -1;
wpa_printf(MSG_INFO, "TESTING: Reset IPN for IGTK");
/* First, use a zero key to avoid any possible duplicate key
* avoidance in the driver. */
if (hostapd_drv_set_key(hapd->conf->iface, hapd,
hapd->last_igtk_alg,
broadcast_ether_addr,
hapd->last_igtk_key_idx, 1, NULL, 0,
zero, hapd->last_igtk_len) < 0)
return -1;
/* Set the previously configured key to reset its TSC */
return hostapd_drv_set_key(hapd->conf->iface, hapd,
hapd->last_igtk_alg,
broadcast_ether_addr,
hapd->last_igtk_key_idx, 1, NULL, 0,
hapd->last_igtk,
hapd->last_igtk_len);
}
#endif /* CONFIG_IEEE80211W */
if (is_broadcast_ether_addr(addr)) {
if (hapd->last_gtk_alg == WPA_ALG_NONE)
return -1;
wpa_printf(MSG_INFO, "TESTING: Reset PN for GTK");
/* First, use a zero key to avoid any possible duplicate key
* avoidance in the driver. */
if (hostapd_drv_set_key(hapd->conf->iface, hapd,
hapd->last_gtk_alg,
broadcast_ether_addr,
hapd->last_gtk_key_idx, 1, NULL, 0,
zero, hapd->last_gtk_len) < 0)
return -1;
/* Set the previously configured key to reset its TSC */
return hostapd_drv_set_key(hapd->conf->iface, hapd,
hapd->last_gtk_alg,
broadcast_ether_addr,
hapd->last_gtk_key_idx, 1, NULL, 0,
hapd->last_gtk, hapd->last_gtk_len);
}
sta = ap_get_sta(hapd, addr);
if (!sta)
return -1;
if (sta->last_tk_alg == WPA_ALG_NONE)
return -1;
wpa_printf(MSG_INFO, "TESTING: Reset PN for " MACSTR,
MAC2STR(sta->addr));
/* First, use a zero key to avoid any possible duplicate key avoidance
* in the driver. */
if (hostapd_drv_set_key(hapd->conf->iface, hapd, sta->last_tk_alg,
sta->addr, sta->last_tk_key_idx, 1, NULL, 0,
zero, sta->last_tk_len) < 0)
return -1;
/* Set the previously configured key to reset its TSC/RSC */
return hostapd_drv_set_key(hapd->conf->iface, hapd, sta->last_tk_alg,
sta->addr, sta->last_tk_key_idx, 1, NULL, 0,
sta->last_tk, sta->last_tk_len);
}
#endif /* CONFIG_TESTING_OPTIONS */
@ -2665,6 +2749,9 @@ static int hostapd_ctrl_iface_receive_process(struct hostapd_data *hapd,
reply_len = -1;
} else if (os_strcmp(buf, "GET_FAIL") == 0) {
reply_len = hostapd_ctrl_get_fail(hapd, reply, reply_size);
} else if (os_strncmp(buf, "RESET_PN ", 9) == 0) {
if (hostapd_ctrl_reset_pn(hapd, buf + 9) < 0)
reply_len = -1;
#endif /* CONFIG_TESTING_OPTIONS */
} else if (os_strncmp(buf, "CHAN_SWITCH ", 12) == 0) {
if (hostapd_ctrl_iface_chan_switch(hapd->iface, buf + 12))

12
src/ap/hostapd.h
View file

@ -304,6 +304,18 @@ struct hostapd_data {
unsigned int ext_eapol_frame_io:1;
struct l2_packet_data *l2_test;
enum wpa_alg last_gtk_alg;
int last_gtk_key_idx;
u8 last_gtk[WPA_GTK_MAX_LEN];
size_t last_gtk_len;
#ifdef CONFIG_IEEE80211W
enum wpa_alg last_igtk_alg;
int last_igtk_key_idx;
u8 last_igtk[WPA_IGTK_MAX_LEN];
size_t last_igtk_len;
#endif /* CONFIG_IEEE80211W */
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_MBO

7
src/ap/sta_info.h
View file

@ -250,6 +250,13 @@ struct sta_info {
struct crypto_ecdh *owe_ecdh;
u16 owe_group;
#endif /* CONFIG_OWE */
#ifdef CONFIG_TESTING_OPTIONS
enum wpa_alg last_tk_alg;
int last_tk_key_idx;
u8 last_tk[WPA_TK_MAX_LEN];
size_t last_tk_len;
#endif /* CONFIG_TESTING_OPTIONS */
};

31
src/ap/wpa_auth_glue.c
View file

@ -349,6 +349,37 @@ static int hostapd_wpa_auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
return -1;
}
#ifdef CONFIG_TESTING_OPTIONS
if (addr && !is_broadcast_ether_addr(addr)) {
struct sta_info *sta;
sta = ap_get_sta(hapd, addr);
if (sta) {
sta->last_tk_alg = alg;
sta->last_tk_key_idx = idx;
if (key)
os_memcpy(sta->last_tk, key, key_len);
sta->last_tk_len = key_len;
}
#ifdef CONFIG_IEEE80211W
} else if (alg == WPA_CIPHER_AES_128_CMAC ||
alg == WPA_CIPHER_BIP_GMAC_128 ||
alg == WPA_CIPHER_BIP_GMAC_256 ||
alg == WPA_CIPHER_BIP_CMAC_256) {
hapd->last_igtk_alg = alg;
hapd->last_igtk_key_idx = idx;
if (key)
os_memcpy(hapd->last_igtk, key, key_len);
hapd->last_igtk_len = key_len;
#endif /* CONFIG_IEEE80211W */
} else {
hapd->last_gtk_alg = alg;
hapd->last_gtk_key_idx = idx;
if (key)
os_memcpy(hapd->last_gtk, key, key_len);
hapd->last_gtk_len = key_len;
}
#endif /* CONFIG_TESTING_OPTIONS */
return hostapd_drv_set_key(ifname, hapd, alg, addr, idx, 1, NULL, 0,
key, key_len);
}

27
wpa_supplicant/ctrl_iface.c
View file

@ -8907,6 +8907,30 @@ static int wpas_ctrl_test_assoc_ie(struct wpa_supplicant *wpa_s,
return 0;
}
static int wpas_ctrl_reset_pn(struct wpa_supplicant *wpa_s)
{
u8 zero[WPA_TK_MAX_LEN];
if (wpa_s->last_tk_alg == WPA_ALG_NONE)
return -1;
wpa_printf(MSG_INFO, "TESTING: Reset PN");
os_memset(zero, 0, sizeof(zero));
/* First, use a zero key to avoid any possible duplicate key avoidance
* in the driver. */
if (wpa_drv_set_key(wpa_s, wpa_s->last_tk_alg, wpa_s->last_tk_addr,
wpa_s->last_tk_key_idx, 1, zero, 6,
zero, wpa_s->last_tk_len) < 0)
return -1;
/* Set the previously configured key to reset its TSC/RSC */
return wpa_drv_set_key(wpa_s, wpa_s->last_tk_alg, wpa_s->last_tk_addr,
wpa_s->last_tk_key_idx, 1, zero, 6,
wpa_s->last_tk, wpa_s->last_tk_len);
}
#endif /* CONFIG_TESTING_OPTIONS */
@ -10278,6 +10302,9 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
} else if (os_strncmp(buf, "TEST_ASSOC_IE ", 14) == 0) {
if (wpas_ctrl_test_assoc_ie(wpa_s, buf + 14) < 0)
reply_len = -1;
} else if (os_strcmp(buf, "RESET_PN") == 0) {
if (wpas_ctrl_reset_pn(wpa_s) < 0)
reply_len = -1;
#endif /* CONFIG_TESTING_OPTIONS */
} else if (os_strncmp(buf, "VENDOR_ELEM_ADD ", 16) == 0) {
if (wpas_ctrl_vendor_elem_add(wpa_s, buf + 16) < 0)

5
wpa_supplicant/events.c
View file

@ -314,6 +314,11 @@ void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
wpas_rrm_reset(wpa_s);
wpa_s->wnmsleep_used = 0;
#ifdef CONFIG_TESTING_OPTIONS
wpa_s->last_tk_alg = WPA_ALG_NONE;
os_memset(wpa_s->last_tk, 0, sizeof(wpa_s->last_tk));
#endif /* CONFIG_TESTING_OPTIONS */
}

5
wpa_supplicant/wpa_supplicant_i.h
View file

@ -1077,6 +1077,11 @@ struct wpa_supplicant {
unsigned int ignore_auth_resp:1;
unsigned int ignore_assoc_disallow:1;
struct wpabuf *sae_commit_override;
enum wpa_alg last_tk_alg;
u8 last_tk_addr[ETH_ALEN];
int last_tk_key_idx;
u8 last_tk[WPA_TK_MAX_LEN];
size_t last_tk_len;
#endif /* CONFIG_TESTING_OPTIONS */
struct wmm_ac_assoc_data *wmm_ac_assoc_info;

10
wpa_supplicant/wpas_glue.c
View file

@ -502,6 +502,16 @@ static int wpa_supplicant_set_key(void *_wpa_s, enum wpa_alg alg,
wpa_s->last_gtk_len = key_len;
}
#endif /* CONFIG_TESTING_GET_GTK */
#ifdef CONFIG_TESTING_OPTIONS
if (addr && !is_broadcast_ether_addr(addr)) {
wpa_s->last_tk_alg = alg;
os_memcpy(wpa_s->last_tk_addr, addr, ETH_ALEN);
wpa_s->last_tk_key_idx = key_idx;
if (key)
os_memcpy(wpa_s->last_tk, key, key_len);
wpa_s->last_tk_len = key_len;
}
#endif /* CONFIG_TESTING_OPTIONS */
return wpa_drv_set_key(wpa_s, alg, addr, key_idx, set_tx, seq, seq_len,
key, key_len);
}