hostap/src/drivers/driver_privsep.c
2010-01-03 18:35:01 +02:00

758 lines
18 KiB
C

/*
* WPA Supplicant - privilege separated driver interface
* Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include <sys/un.h>
#include "common.h"
#include "driver.h"
#include "eloop.h"
#include "common/privsep_commands.h"
struct wpa_driver_privsep_data {
void *ctx;
u8 own_addr[ETH_ALEN];
int priv_socket;
char *own_socket_path;
int cmd_socket;
char *own_cmd_path;
struct sockaddr_un priv_addr;
char ifname[16];
};
static int wpa_priv_reg_cmd(struct wpa_driver_privsep_data *drv, int cmd)
{
int res;
res = sendto(drv->priv_socket, &cmd, sizeof(cmd), 0,
(struct sockaddr *) &drv->priv_addr,
sizeof(drv->priv_addr));
if (res < 0)
perror("sendto");
return res < 0 ? -1 : 0;
}
static int wpa_priv_cmd(struct wpa_driver_privsep_data *drv, int cmd,
const void *data, size_t data_len,
void *reply, size_t *reply_len)
{
struct msghdr msg;
struct iovec io[2];
io[0].iov_base = &cmd;
io[0].iov_len = sizeof(cmd);
io[1].iov_base = (u8 *) data;
io[1].iov_len = data_len;
os_memset(&msg, 0, sizeof(msg));
msg.msg_iov = io;
msg.msg_iovlen = data ? 2 : 1;
msg.msg_name = &drv->priv_addr;
msg.msg_namelen = sizeof(drv->priv_addr);
if (sendmsg(drv->cmd_socket, &msg, 0) < 0) {
perror("sendmsg(cmd_socket)");
return -1;
}
if (reply) {
fd_set rfds;
struct timeval tv;
int res;
FD_ZERO(&rfds);
FD_SET(drv->cmd_socket, &rfds);
tv.tv_sec = 5;
tv.tv_usec = 0;
res = select(drv->cmd_socket + 1, &rfds, NULL, NULL, &tv);
if (res < 0 && errno != EINTR) {
perror("select");
return -1;
}
if (FD_ISSET(drv->cmd_socket, &rfds)) {
res = recv(drv->cmd_socket, reply, *reply_len, 0);
if (res < 0) {
perror("recv");
return -1;
}
*reply_len = res;
} else {
wpa_printf(MSG_DEBUG, "PRIVSEP: Timeout while waiting "
"for reply (cmd=%d)", cmd);
return -1;
}
}
return 0;
}
static int wpa_driver_privsep_scan(void *priv,
struct wpa_driver_scan_params *params)
{
struct wpa_driver_privsep_data *drv = priv;
const u8 *ssid = params->ssids[0].ssid;
size_t ssid_len = params->ssids[0].ssid_len;
wpa_printf(MSG_DEBUG, "%s: priv=%p", __func__, priv);
return wpa_priv_cmd(drv, PRIVSEP_CMD_SCAN, ssid, ssid_len,
NULL, NULL);
}
static struct wpa_scan_results *
wpa_driver_privsep_get_scan_results2(void *priv)
{
struct wpa_driver_privsep_data *drv = priv;
int res, num;
u8 *buf, *pos, *end;
size_t reply_len = 60000;
struct wpa_scan_results *results;
struct wpa_scan_res *r;
buf = os_malloc(reply_len);
if (buf == NULL)
return NULL;
res = wpa_priv_cmd(drv, PRIVSEP_CMD_GET_SCAN_RESULTS,
NULL, 0, buf, &reply_len);
if (res < 0) {
os_free(buf);
return NULL;
}
wpa_printf(MSG_DEBUG, "privsep: Received %lu bytes of scan results",
(unsigned long) reply_len);
if (reply_len < sizeof(int)) {
wpa_printf(MSG_DEBUG, "privsep: Invalid scan result len %lu",
(unsigned long) reply_len);
os_free(buf);
return NULL;
}
pos = buf;
end = buf + reply_len;
os_memcpy(&num, pos, sizeof(int));
if (num < 0 || num > 1000) {
os_free(buf);
return NULL;
}
pos += sizeof(int);
results = os_zalloc(sizeof(*results));
if (results == NULL) {
os_free(buf);
return NULL;
}
results->res = os_zalloc(num * sizeof(struct wpa_scan_res *));
if (results->res == NULL) {
os_free(results);
os_free(buf);
return NULL;
}
while (results->num < (size_t) num && pos + sizeof(int) < end) {
int len;
os_memcpy(&len, pos, sizeof(int));
pos += sizeof(int);
if (len < 0 || len > 10000 || pos + len > end)
break;
r = os_malloc(len);
if (r == NULL)
break;
os_memcpy(r, pos, len);
pos += len;
if (sizeof(*r) + r->ie_len > (size_t) len) {
os_free(r);
break;
}
results->res[results->num++] = r;
}
os_free(buf);
return results;
}
static int wpa_driver_privsep_set_key(const char *ifname, void *priv,
enum wpa_alg alg, const u8 *addr,
int key_idx, int set_tx,
const u8 *seq, size_t seq_len,
const u8 *key, size_t key_len)
{
struct wpa_driver_privsep_data *drv = priv;
struct privsep_cmd_set_key cmd;
wpa_printf(MSG_DEBUG, "%s: priv=%p alg=%d key_idx=%d set_tx=%d",
__func__, priv, alg, key_idx, set_tx);
os_memset(&cmd, 0, sizeof(cmd));
cmd.alg = alg;
if (addr)
os_memcpy(cmd.addr, addr, ETH_ALEN);
else
os_memset(cmd.addr, 0xff, ETH_ALEN);
cmd.key_idx = key_idx;
cmd.set_tx = set_tx;
if (seq && seq_len > 0 && seq_len < sizeof(cmd.seq)) {
os_memcpy(cmd.seq, seq, seq_len);
cmd.seq_len = seq_len;
}
if (key && key_len > 0 && key_len < sizeof(cmd.key)) {
os_memcpy(cmd.key, key, key_len);
cmd.key_len = key_len;
}
return wpa_priv_cmd(drv, PRIVSEP_CMD_SET_KEY, &cmd, sizeof(cmd),
NULL, NULL);
}
static int wpa_driver_privsep_associate(
void *priv, struct wpa_driver_associate_params *params)
{
struct wpa_driver_privsep_data *drv = priv;
struct privsep_cmd_associate *data;
int res;
size_t buflen;
wpa_printf(MSG_DEBUG, "%s: priv=%p freq=%d pairwise_suite=%d "
"group_suite=%d key_mgmt_suite=%d auth_alg=%d mode=%d",
__func__, priv, params->freq, params->pairwise_suite,
params->group_suite, params->key_mgmt_suite,
params->auth_alg, params->mode);
buflen = sizeof(*data) + params->wpa_ie_len;
data = os_zalloc(buflen);
if (data == NULL)
return -1;
if (params->bssid)
os_memcpy(data->bssid, params->bssid, ETH_ALEN);
os_memcpy(data->ssid, params->ssid, params->ssid_len);
data->ssid_len = params->ssid_len;
data->freq = params->freq;
data->pairwise_suite = params->pairwise_suite;
data->group_suite = params->group_suite;
data->key_mgmt_suite = params->key_mgmt_suite;
data->auth_alg = params->auth_alg;
data->mode = params->mode;
data->wpa_ie_len = params->wpa_ie_len;
if (params->wpa_ie)
os_memcpy(data + 1, params->wpa_ie, params->wpa_ie_len);
/* TODO: add support for other assoc parameters */
res = wpa_priv_cmd(drv, PRIVSEP_CMD_ASSOCIATE, data, buflen,
NULL, NULL);
os_free(data);
return res;
}
static int wpa_driver_privsep_get_bssid(void *priv, u8 *bssid)
{
struct wpa_driver_privsep_data *drv = priv;
int res;
size_t len = ETH_ALEN;
res = wpa_priv_cmd(drv, PRIVSEP_CMD_GET_BSSID, NULL, 0, bssid, &len);
if (res < 0 || len != ETH_ALEN)
return -1;
return 0;
}
static int wpa_driver_privsep_get_ssid(void *priv, u8 *ssid)
{
struct wpa_driver_privsep_data *drv = priv;
int res, ssid_len;
u8 reply[sizeof(int) + 32];
size_t len = sizeof(reply);
res = wpa_priv_cmd(drv, PRIVSEP_CMD_GET_SSID, NULL, 0, reply, &len);
if (res < 0 || len < sizeof(int))
return -1;
os_memcpy(&ssid_len, reply, sizeof(int));
if (ssid_len < 0 || ssid_len > 32 || sizeof(int) + ssid_len > len) {
wpa_printf(MSG_DEBUG, "privsep: Invalid get SSID reply");
return -1;
}
os_memcpy(ssid, &reply[sizeof(int)], ssid_len);
return ssid_len;
}
static int wpa_driver_privsep_deauthenticate(void *priv, const u8 *addr,
int reason_code)
{
//struct wpa_driver_privsep_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s addr=" MACSTR " reason_code=%d",
__func__, MAC2STR(addr), reason_code);
wpa_printf(MSG_DEBUG, "%s - TODO", __func__);
return 0;
}
static int wpa_driver_privsep_disassociate(void *priv, const u8 *addr,
int reason_code)
{
//struct wpa_driver_privsep_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s addr=" MACSTR " reason_code=%d",
__func__, MAC2STR(addr), reason_code);
wpa_printf(MSG_DEBUG, "%s - TODO", __func__);
return 0;
}
static void wpa_driver_privsep_event_assoc(void *ctx,
enum wpa_event_type event,
u8 *buf, size_t len)
{
union wpa_event_data data;
int inc_data = 0;
u8 *pos, *end;
int ie_len;
os_memset(&data, 0, sizeof(data));
pos = buf;
end = buf + len;
if (end - pos < (int) sizeof(int))
return;
os_memcpy(&ie_len, pos, sizeof(int));
pos += sizeof(int);
if (ie_len < 0 || ie_len > end - pos)
return;
if (ie_len) {
data.assoc_info.req_ies = pos;
data.assoc_info.req_ies_len = ie_len;
pos += ie_len;
inc_data = 1;
}
wpa_supplicant_event(ctx, event, inc_data ? &data : NULL);
}
static void wpa_driver_privsep_event_interface_status(void *ctx, u8 *buf,
size_t len)
{
union wpa_event_data data;
int ievent;
if (len < sizeof(int) ||
len - sizeof(int) > sizeof(data.interface_status.ifname))
return;
os_memcpy(&ievent, buf, sizeof(int));
os_memset(&data, 0, sizeof(data));
data.interface_status.ievent = ievent;
os_memcpy(data.interface_status.ifname, buf + sizeof(int),
len - sizeof(int));
wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &data);
}
static void wpa_driver_privsep_event_michael_mic_failure(
void *ctx, u8 *buf, size_t len)
{
union wpa_event_data data;
if (len != sizeof(int))
return;
os_memset(&data, 0, sizeof(data));
os_memcpy(&data.michael_mic_failure.unicast, buf, sizeof(int));
wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
}
static void wpa_driver_privsep_event_pmkid_candidate(void *ctx, u8 *buf,
size_t len)
{
union wpa_event_data data;
if (len != sizeof(struct pmkid_candidate))
return;
os_memset(&data, 0, sizeof(data));
os_memcpy(&data.pmkid_candidate, buf, len);
wpa_supplicant_event(ctx, EVENT_PMKID_CANDIDATE, &data);
}
static void wpa_driver_privsep_event_stkstart(void *ctx, u8 *buf, size_t len)
{
union wpa_event_data data;
if (len != ETH_ALEN)
return;
os_memset(&data, 0, sizeof(data));
os_memcpy(data.stkstart.peer, buf, ETH_ALEN);
wpa_supplicant_event(ctx, EVENT_STKSTART, &data);
}
static void wpa_driver_privsep_event_ft_response(void *ctx, u8 *buf,
size_t len)
{
union wpa_event_data data;
if (len < sizeof(int) + ETH_ALEN)
return;
os_memset(&data, 0, sizeof(data));
os_memcpy(&data.ft_ies.ft_action, buf, sizeof(int));
os_memcpy(data.ft_ies.target_ap, buf + sizeof(int), ETH_ALEN);
data.ft_ies.ies = buf + sizeof(int) + ETH_ALEN;
data.ft_ies.ies_len = len - sizeof(int) - ETH_ALEN;
wpa_supplicant_event(ctx, EVENT_FT_RESPONSE, &data);
}
static void wpa_driver_privsep_event_rx_eapol(void *ctx, u8 *buf, size_t len)
{
if (len < ETH_ALEN)
return;
drv_event_eapol_rx(ctx, buf, buf + ETH_ALEN, len - ETH_ALEN);
}
static void wpa_driver_privsep_receive(int sock, void *eloop_ctx,
void *sock_ctx)
{
struct wpa_driver_privsep_data *drv = eloop_ctx;
u8 *buf, *event_buf;
size_t event_len;
int res, event;
enum privsep_event e;
struct sockaddr_un from;
socklen_t fromlen = sizeof(from);
const size_t buflen = 2000;
buf = os_malloc(buflen);
if (buf == NULL)
return;
res = recvfrom(sock, buf, buflen, 0,
(struct sockaddr *) &from, &fromlen);
if (res < 0) {
perror("recvfrom(priv_socket)");
os_free(buf);
return;
}
wpa_printf(MSG_DEBUG, "privsep_driver: received %u bytes", res);
if (res < (int) sizeof(int)) {
wpa_printf(MSG_DEBUG, "Too short event message (len=%d)", res);
return;
}
os_memcpy(&event, buf, sizeof(int));
event_buf = &buf[sizeof(int)];
event_len = res - sizeof(int);
wpa_printf(MSG_DEBUG, "privsep: Event %d received (len=%lu)",
event, (unsigned long) event_len);
e = event;
switch (e) {
case PRIVSEP_EVENT_SCAN_RESULTS:
wpa_supplicant_event(drv->ctx, EVENT_SCAN_RESULTS, NULL);
break;
case PRIVSEP_EVENT_ASSOC:
wpa_driver_privsep_event_assoc(drv->ctx, EVENT_ASSOC,
event_buf, event_len);
break;
case PRIVSEP_EVENT_DISASSOC:
wpa_supplicant_event(drv->ctx, EVENT_DISASSOC, NULL);
break;
case PRIVSEP_EVENT_ASSOCINFO:
wpa_driver_privsep_event_assoc(drv->ctx, EVENT_ASSOCINFO,
event_buf, event_len);
break;
case PRIVSEP_EVENT_MICHAEL_MIC_FAILURE:
wpa_driver_privsep_event_michael_mic_failure(
drv->ctx, event_buf, event_len);
break;
case PRIVSEP_EVENT_INTERFACE_STATUS:
wpa_driver_privsep_event_interface_status(drv->ctx, event_buf,
event_len);
break;
case PRIVSEP_EVENT_PMKID_CANDIDATE:
wpa_driver_privsep_event_pmkid_candidate(drv->ctx, event_buf,
event_len);
break;
case PRIVSEP_EVENT_STKSTART:
wpa_driver_privsep_event_stkstart(drv->ctx, event_buf,
event_len);
break;
case PRIVSEP_EVENT_FT_RESPONSE:
wpa_driver_privsep_event_ft_response(drv->ctx, event_buf,
event_len);
break;
case PRIVSEP_EVENT_RX_EAPOL:
wpa_driver_privsep_event_rx_eapol(drv->ctx, event_buf,
event_len);
break;
}
os_free(buf);
}
static void * wpa_driver_privsep_init(void *ctx, const char *ifname)
{
struct wpa_driver_privsep_data *drv;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
return NULL;
drv->ctx = ctx;
drv->priv_socket = -1;
drv->cmd_socket = -1;
os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
return drv;
}
static void wpa_driver_privsep_deinit(void *priv)
{
struct wpa_driver_privsep_data *drv = priv;
if (drv->priv_socket >= 0) {
wpa_priv_reg_cmd(drv, PRIVSEP_CMD_UNREGISTER);
eloop_unregister_read_sock(drv->priv_socket);
close(drv->priv_socket);
}
if (drv->own_socket_path) {
unlink(drv->own_socket_path);
os_free(drv->own_socket_path);
}
if (drv->cmd_socket >= 0) {
eloop_unregister_read_sock(drv->cmd_socket);
close(drv->cmd_socket);
}
if (drv->own_cmd_path) {
unlink(drv->own_cmd_path);
os_free(drv->own_cmd_path);
}
os_free(drv);
}
static int wpa_driver_privsep_set_param(void *priv, const char *param)
{
struct wpa_driver_privsep_data *drv = priv;
const char *pos;
char *own_dir, *priv_dir;
static unsigned int counter = 0;
size_t len;
struct sockaddr_un addr;
wpa_printf(MSG_DEBUG, "%s: param='%s'", __func__, param);
if (param == NULL)
pos = NULL;
else
pos = os_strstr(param, "own_dir=");
if (pos) {
char *end;
own_dir = os_strdup(pos + 8);
if (own_dir == NULL)
return -1;
end = os_strchr(own_dir, ' ');
if (end)
*end = '\0';
} else {
own_dir = os_strdup("/tmp");
if (own_dir == NULL)
return -1;
}
if (param == NULL)
pos = NULL;
else
pos = os_strstr(param, "priv_dir=");
if (pos) {
char *end;
priv_dir = os_strdup(pos + 9);
if (priv_dir == NULL) {
os_free(own_dir);
return -1;
}
end = os_strchr(priv_dir, ' ');
if (end)
*end = '\0';
} else {
priv_dir = os_strdup("/var/run/wpa_priv");
if (priv_dir == NULL) {
os_free(own_dir);
return -1;
}
}
len = os_strlen(own_dir) + 50;
drv->own_socket_path = os_malloc(len);
if (drv->own_socket_path == NULL) {
os_free(priv_dir);
os_free(own_dir);
return -1;
}
os_snprintf(drv->own_socket_path, len, "%s/wpa_privsep-%d-%d",
own_dir, getpid(), counter++);
len = os_strlen(own_dir) + 50;
drv->own_cmd_path = os_malloc(len);
if (drv->own_cmd_path == NULL) {
os_free(drv->own_socket_path);
drv->own_socket_path = NULL;
os_free(priv_dir);
os_free(own_dir);
return -1;
}
os_snprintf(drv->own_cmd_path, len, "%s/wpa_privsep-%d-%d",
own_dir, getpid(), counter++);
os_free(own_dir);
drv->priv_addr.sun_family = AF_UNIX;
os_snprintf(drv->priv_addr.sun_path, sizeof(drv->priv_addr.sun_path),
"%s/%s", priv_dir, drv->ifname);
os_free(priv_dir);
drv->priv_socket = socket(PF_UNIX, SOCK_DGRAM, 0);
if (drv->priv_socket < 0) {
perror("socket(PF_UNIX)");
os_free(drv->own_socket_path);
drv->own_socket_path = NULL;
return -1;
}
os_memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
os_strlcpy(addr.sun_path, drv->own_socket_path, sizeof(addr.sun_path));
if (bind(drv->priv_socket, (struct sockaddr *) &addr, sizeof(addr)) <
0) {
perror("bind(PF_UNIX)");
close(drv->priv_socket);
drv->priv_socket = -1;
unlink(drv->own_socket_path);
os_free(drv->own_socket_path);
drv->own_socket_path = NULL;
return -1;
}
eloop_register_read_sock(drv->priv_socket, wpa_driver_privsep_receive,
drv, NULL);
drv->cmd_socket = socket(PF_UNIX, SOCK_DGRAM, 0);
if (drv->cmd_socket < 0) {
perror("socket(PF_UNIX)");
os_free(drv->own_cmd_path);
drv->own_cmd_path = NULL;
return -1;
}
os_memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
os_strlcpy(addr.sun_path, drv->own_cmd_path, sizeof(addr.sun_path));
if (bind(drv->cmd_socket, (struct sockaddr *) &addr, sizeof(addr)) < 0)
{
perror("bind(PF_UNIX)");
close(drv->cmd_socket);
drv->cmd_socket = -1;
unlink(drv->own_cmd_path);
os_free(drv->own_cmd_path);
drv->own_cmd_path = NULL;
return -1;
}
if (wpa_priv_reg_cmd(drv, PRIVSEP_CMD_REGISTER) < 0) {
wpa_printf(MSG_ERROR, "Failed to register with wpa_priv");
return -1;
}
return 0;
}
static int wpa_driver_privsep_get_capa(void *priv,
struct wpa_driver_capa *capa)
{
struct wpa_driver_privsep_data *drv = priv;
int res;
size_t len = sizeof(*capa);
res = wpa_priv_cmd(drv, PRIVSEP_CMD_GET_CAPA, NULL, 0, capa, &len);
if (res < 0 || len != sizeof(*capa))
return -1;
return 0;
}
static const u8 * wpa_driver_privsep_get_mac_addr(void *priv)
{
struct wpa_driver_privsep_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __func__);
return drv->own_addr;
}
static int wpa_driver_privsep_set_country(void *priv, const char *alpha2)
{
struct wpa_driver_privsep_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s country='%s'", __func__, alpha2);
return wpa_priv_cmd(drv, PRIVSEP_CMD_SET_COUNTRY, alpha2,
os_strlen(alpha2), NULL, NULL);
}
struct wpa_driver_ops wpa_driver_privsep_ops = {
"privsep",
"wpa_supplicant privilege separated driver",
.get_bssid = wpa_driver_privsep_get_bssid,
.get_ssid = wpa_driver_privsep_get_ssid,
.set_key = wpa_driver_privsep_set_key,
.init = wpa_driver_privsep_init,
.deinit = wpa_driver_privsep_deinit,
.set_param = wpa_driver_privsep_set_param,
.scan2 = wpa_driver_privsep_scan,
.deauthenticate = wpa_driver_privsep_deauthenticate,
.disassociate = wpa_driver_privsep_disassociate,
.associate = wpa_driver_privsep_associate,
.get_capa = wpa_driver_privsep_get_capa,
.get_mac_addr = wpa_driver_privsep_get_mac_addr,
.get_scan_results2 = wpa_driver_privsep_get_scan_results2,
.set_country = wpa_driver_privsep_set_country,
};
struct wpa_driver_ops *wpa_drivers[] =
{
&wpa_driver_privsep_ops,
NULL
};