AP: Allow identifying which passphrase station used with wpa_psk_file

It is now possible to optionally specify keyid for
each wpa_psk_file entry:

 keyid=something 00:00:00:00:00:00 secretpassphrase

When station connects and the passphrase it used
has an associated keyid it will be appended to the
AP-STA-CONNECTED event string:

 wlan0: AP-STA-CONNECTED 00:36:76:21:dc:7b keyid=something

It's also possible to retrieve it through the control interface:

 $ hostapd_cli all_sta
 Selected interface 'ap0'
 00:36:76:21:dc:7b
 ...
 keyid=something

New hostapd is able to read old wpa_psk_file. However, old hostapd will
not be able to read the new wpa_psk_file if it includes keyids.

Signed-off-by: Michal Kazior <michal@plume.com>
This commit is contained in:
Michal Kazior 2019-01-16 13:35:19 +01:00 committed by Jouni Malinen
parent b08c9ad0c7
commit ec5c39a557
6 changed files with 103 additions and 9 deletions

View File

@ -3,7 +3,10 @@
# Special MAC address 00:00:00:00:00:00 can be used to configure PSKs that
# anyone can use. PSK can be configured as an ASCII passphrase of 8..63
# characters or as a 256-bit hex PSK (64 hex digits).
# An optional key identifier can be added by prefixing the line with
# keyid=<keyid_string>
00:00:00:00:00:00 secret passphrase
00:11:22:33:44:55 another passphrase
00:22:33:44:55:66 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
keyid=example_id 00:11:22:33:44:77 passphrase with keyid
00:00:00:00:00:00 another passphrase for all STAs

View File

@ -259,6 +259,12 @@ static int hostapd_config_read_wpa_psk(const char *fname,
{
FILE *f;
char buf[128], *pos;
const char *keyid;
char *context;
char *context2;
char *token;
char *name;
char *value;
int line = 0, ret = 0, len, ok;
u8 addr[ETH_ALEN];
struct hostapd_wpa_psk *psk;
@ -288,9 +294,35 @@ static int hostapd_config_read_wpa_psk(const char *fname,
if (buf[0] == '\0')
continue;
if (hwaddr_aton(buf, addr)) {
context = NULL;
keyid = NULL;
while ((token = str_token(buf, " ", &context))) {
if (!os_strchr(token, '='))
break;
context2 = NULL;
name = str_token(token, "=", &context2);
value = str_token(token, "", &context2);
if (!value)
value = "";
if (!os_strcmp(name, "keyid")) {
keyid = value;
} else {
wpa_printf(MSG_ERROR,
"Unrecognized '%s=%s' on line %d in '%s'",
name, value, line, fname);
ret = -1;
break;
}
}
if (ret == -1)
break;
if (!token)
token = "";
if (hwaddr_aton(token, addr)) {
wpa_printf(MSG_ERROR, "Invalid MAC address '%s' on "
"line %d in '%s'", buf, line, fname);
"line %d in '%s'", token, line, fname);
ret = -1;
break;
}
@ -306,15 +338,14 @@ static int hostapd_config_read_wpa_psk(const char *fname,
else
os_memcpy(psk->addr, addr, ETH_ALEN);
pos = buf + 17;
if (*pos == '\0') {
pos = str_token(buf, "", &context);
if (!pos) {
wpa_printf(MSG_ERROR, "No PSK on line %d in '%s'",
line, fname);
os_free(psk);
ret = -1;
break;
}
pos++;
ok = 0;
len = os_strlen(pos);
@ -333,6 +364,18 @@ static int hostapd_config_read_wpa_psk(const char *fname,
break;
}
if (keyid) {
len = os_strlcpy(psk->keyid, keyid, sizeof(psk->keyid));
if ((size_t) len >= sizeof(psk->keyid)) {
wpa_printf(MSG_ERROR,
"PSK keyid too long on line %d in '%s'",
line, fname);
os_free(psk);
ret = -1;
break;
}
}
psk->next = ssid->wpa_psk;
ssid->wpa_psk = psk;
}

View File

@ -134,6 +134,7 @@ struct hostapd_vlan {
};
#define PMK_LEN 32
#define KEYID_LEN 32
#define MIN_PASSPHRASE_LEN 8
#define MAX_PASSPHRASE_LEN 63
struct hostapd_sta_wpa_psk_short {
@ -147,6 +148,7 @@ struct hostapd_sta_wpa_psk_short {
struct hostapd_wpa_psk {
struct hostapd_wpa_psk *next;
int group;
char keyid[KEYID_LEN];
u8 psk[PMK_LEN];
u8 addr[ETH_ALEN];
u8 p2p_dev_addr[ETH_ALEN];

View File

@ -207,6 +207,7 @@ static int hostapd_ctrl_iface_sta_mib(struct hostapd_data *hapd,
char *buf, size_t buflen)
{
int len, res, ret, i;
const char *keyid;
if (!sta)
return 0;
@ -341,6 +342,13 @@ static int hostapd_ctrl_iface_sta_mib(struct hostapd_data *hapd,
len += ret;
}
keyid = ap_sta_wpa_get_keyid(hapd, sta);
if (keyid) {
ret = os_snprintf(buf + len, buflen - len, "keyid=%s\n", keyid);
if (!os_snprintf_error(buflen - len, ret))
len += ret;
}
return len;
}

View File

@ -1163,6 +1163,32 @@ void ap_sta_stop_sa_query(struct hostapd_data *hapd, struct sta_info *sta)
#endif /* CONFIG_IEEE80211W */
const char * ap_sta_wpa_get_keyid(struct hostapd_data *hapd,
struct sta_info *sta)
{
struct hostapd_wpa_psk *psk;
struct hostapd_ssid *ssid;
const u8 *pmk;
int pmk_len;
ssid = &hapd->conf->ssid;
pmk = wpa_auth_get_pmk(sta->wpa_sm, &pmk_len);
if (!pmk || pmk_len != PMK_LEN)
return NULL;
for (psk = ssid->wpa_psk; psk; psk = psk->next)
if (os_memcmp(pmk, psk->psk, PMK_LEN) == 0)
break;
if (!psk)
return NULL;
if (!psk || !psk->keyid[0])
return NULL;
return psk->keyid;
}
void ap_sta_set_authorized(struct hostapd_data *hapd, struct sta_info *sta,
int authorized)
{
@ -1201,7 +1227,11 @@ void ap_sta_set_authorized(struct hostapd_data *hapd, struct sta_info *sta,
sta->addr, authorized, dev_addr);
if (authorized) {
const char *keyid;
char keyid_buf[100];
char ip_addr[100];
keyid_buf[0] = '\0';
ip_addr[0] = '\0';
#ifdef CONFIG_P2P
if (wpa_auth_get_ip_addr(sta->wpa_sm, ip_addr_buf) == 0) {
@ -1212,14 +1242,20 @@ void ap_sta_set_authorized(struct hostapd_data *hapd, struct sta_info *sta,
}
#endif /* CONFIG_P2P */
wpa_msg(hapd->msg_ctx, MSG_INFO, AP_STA_CONNECTED "%s%s",
buf, ip_addr);
keyid = ap_sta_wpa_get_keyid(hapd, sta);
if (keyid) {
os_snprintf(keyid_buf, sizeof(keyid_buf),
" keyid=%s", keyid);
}
wpa_msg(hapd->msg_ctx, MSG_INFO, AP_STA_CONNECTED "%s%s%s",
buf, ip_addr, keyid_buf);
if (hapd->msg_ctx_parent &&
hapd->msg_ctx_parent != hapd->msg_ctx)
wpa_msg_no_global(hapd->msg_ctx_parent, MSG_INFO,
AP_STA_CONNECTED "%s%s",
buf, ip_addr);
AP_STA_CONNECTED "%s%s%s",
buf, ip_addr, keyid_buf);
} else {
wpa_msg(hapd->msg_ctx, MSG_INFO, AP_STA_DISCONNECTED "%s", buf);

View File

@ -324,6 +324,8 @@ int ap_sta_set_vlan(struct hostapd_data *hapd, struct sta_info *sta,
void ap_sta_start_sa_query(struct hostapd_data *hapd, struct sta_info *sta);
void ap_sta_stop_sa_query(struct hostapd_data *hapd, struct sta_info *sta);
int ap_check_sa_query_timeout(struct hostapd_data *hapd, struct sta_info *sta);
const char * ap_sta_wpa_get_keyid(struct hostapd_data *hapd,
struct sta_info *sta);
void ap_sta_disconnect(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *addr, u16 reason);