path: root/hcid/security.c

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2002-2006  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

#include "glib-ectomy.h"

#include "hcid.h"
#include "lib.h"

struct g_io_info {
	GIOChannel	*channel;
	int		watch_id;
	int		pin_length;
};

static struct g_io_info io_data[HCI_MAX_DEV];

static int pairing = HCID_PAIRING_MULTI;

static inline int get_bdaddr(int dev, bdaddr_t *sba, uint16_t handle, bdaddr_t *dba)
{
	struct hci_conn_list_req *cl;
	struct hci_conn_info *ci;
	char addr[18];
	int i;

	cl = malloc(10 * sizeof(*ci) + sizeof(*cl));
	if (!cl)
		return -ENOMEM;

	ba2str(sba, addr);
	cl->dev_id = hci_devid(addr);
	cl->conn_num = 10;
	ci = cl->conn_info;

	if (ioctl(dev, HCIGETCONNLIST, (void *) cl) < 0) {
		free(cl);
		return -EIO;
	}

	for (i = 0; i < cl->conn_num; i++, ci++)
		if (ci->handle == handle) {
			bacpy(dba, &ci->bdaddr);
			free(cl);
			return 0;
		}

	free(cl);

	return -ENOENT;
}

static inline void update_lastseen(bdaddr_t *sba, bdaddr_t *dba)
{
	time_t t;
	struct tm *tm;

	t = time(NULL);
	tm = gmtime(&t);

	write_lastseen_info(sba, dba, tm);
}

static inline void update_lastused(bdaddr_t *sba, bdaddr_t *dba)
{
	time_t t;
	struct tm *tm;

	t = time(NULL);
	tm = gmtime(&t);

	write_lastused_info(sba, dba, tm);
}

/* Link Key handling */

static void link_key_request(int dev, bdaddr_t *sba, bdaddr_t *dba)
{
	unsigned char key[16];
	char sa[18], da[18];
	int err;

	ba2str(sba, sa); ba2str(dba, da);
	info("link_key_request (sba=%s, dba=%s)", sa, da);

	err = read_link_key(sba, dba, key);
	if (err < 0) {
		/* Link key not found */
		hci_send_cmd(dev, OGF_LINK_CTL, OCF_LINK_KEY_NEG_REPLY, 6, dba);
	} else {
		/* Link key found */
		link_key_reply_cp lr;
		memcpy(lr.link_key, key, 16);
		bacpy(&lr.bdaddr, dba);
		hci_send_cmd(dev, OGF_LINK_CTL, OCF_LINK_KEY_REPLY,
						LINK_KEY_REPLY_CP_SIZE, &lr);
	}
}

static void link_key_notify(int dev, bdaddr_t *sba, void *ptr)
{
	evt_link_key_notify *evt = ptr;
	bdaddr_t *dba = &evt->bdaddr;
	char sa[18], da[18];
	int dev_id;

	ba2str(sba, sa); ba2str(dba, da);
	info("link_key_notify (sba=%s, dba=%s)", sa, da);

	dev_id = hci_devid(sa);

	write_link_key(sba, dba, evt->link_key, evt->key_type,
						io_data[dev_id].pin_length);

	io_data[dev_id].pin_length = -1;
}

static void return_link_keys(int dev, bdaddr_t *sba, void *ptr)
{
	evt_return_link_keys *evt = ptr;
	uint8_t num = evt->num_keys;
	unsigned char key[16];
	char sa[18], da[18];
	bdaddr_t dba;
	int i;

	ba2str(sba, sa);
	ptr++;

	for (i = 0; i < num; i++) {
		bacpy(&dba, ptr); ba2str(&dba, da);
		memcpy(key, ptr + 6, 16);

		info("return_link_keys (sba=%s, dba=%s)", sa, da);

		ptr += 22;
	}
}

/* PIN code handling */

void set_pin_length(bdaddr_t *sba, int length)
{
	char addr[18];
	int dev_id;

	ba2str(sba, addr);
	dev_id = hci_devid(addr);

	io_data[dev_id].pin_length = length;
}

static void request_pin(int dev, bdaddr_t *sba, struct hci_conn_info *ci)
{
#ifdef ENABLE_DBUS
	hcid_dbus_request_pin(dev, sba, ci);
#else
	pin_code_reply_cp pr;
	char *pin = "BlueZ";
	int len;

	len  = strlen(pin);

	set_pin_length(sba, len);

	memset(&pr, 0, sizeof(pr));
	bacpy(&pr.bdaddr, &ci->bdaddr);
	memcpy(pr.pin_code, pin, len);
	pr.pin_len = len;

	hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_REPLY,
					PIN_CODE_REPLY_CP_SIZE, &pr);
#endif
}

static void pin_code_request(int dev, bdaddr_t *sba, bdaddr_t *dba)
{
	pin_code_reply_cp pr;
	struct hci_conn_info_req *cr;
	struct hci_conn_info *ci;
	unsigned char key[16];
	char sa[18], da[18], pin[17];
	int err, pinlen;

	memset(&pr, 0, sizeof(pr));
	bacpy(&pr.bdaddr, dba);

	ba2str(sba, sa); ba2str(dba, da);
	info("pin_code_request (sba=%s, dba=%s)", sa, da);

	cr = malloc(sizeof(*cr) + sizeof(*ci));
	if (!cr)
		return;

	bacpy(&cr->bdaddr, dba);
	cr->type = ACL_LINK;
	if (ioctl(dev, HCIGETCONNINFO, (unsigned long) cr) < 0) {
		error("Can't get conn info: %s (%d)", strerror(errno), errno);
		goto reject;
	}
	ci = cr->conn_info;

	memset(pin, 0, sizeof(pin));
	pinlen = read_pin_code(sba, dba, pin);

	if (pairing == HCID_PAIRING_ONCE) {
		err = read_link_key(sba, dba, key);
		if (!err) {
			ba2str(dba, da);
			error("PIN code request for already paired device %s", da);
			goto reject;
		}
	} else if (pairing == HCID_PAIRING_NONE)
		goto reject;

	if (hcid.security == HCID_SEC_AUTO) {
		if (!ci->out) {
			/* Incomming connection */
			set_pin_length(sba, hcid.pin_len);
			memcpy(pr.pin_code, hcid.pin_code, hcid.pin_len);
			pr.pin_len = hcid.pin_len;
			hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_REPLY,
				PIN_CODE_REPLY_CP_SIZE, &pr);
		} else {
			/* Outgoing connection */
			if (pinlen > 0) {
				set_pin_length(sba, pinlen);
				memcpy(pr.pin_code, pin, pinlen);
				pr.pin_len = pinlen;
				hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_REPLY,
					PIN_CODE_REPLY_CP_SIZE, &pr);
			} else {
				/* Let PIN helper handle that */ 
				request_pin(dev, sba, ci);
			}
		}
	} else {
		/* Let PIN helper handle that */ 
		request_pin(dev, sba, ci);
	}

	free(cr);

	return;

reject:
	free(cr);

	hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_NEG_REPLY, 6, dba);

	return;
}

static inline void cmd_status(int dev, bdaddr_t *sba, void *ptr)
{
	evt_cmd_status *evt = ptr;

	if (evt->status)
		return;

	if (evt->opcode == cmd_opcode_pack(OGF_LINK_CTL, OCF_INQUIRY))
		hcid_dbus_inquiry_start(sba);
}

static inline void cmd_complete(int dev, bdaddr_t *sba, void *ptr)
{
	evt_cmd_complete *evt = ptr;
	switch (evt->opcode) {
	case cmd_opcode_pack(OGF_LINK_CTL, OCF_INQUIRY_CANCEL):
		hcid_dbus_inquiry_complete(sba);
		break;
	case cmd_opcode_pack(OGF_HOST_CTL, OCF_CHANGE_LOCAL_NAME):
		hcid_dbus_setname_complete(sba);
		break;
	case cmd_opcode_pack(OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE):
		hcid_dbus_setscan_enable_complete(sba);
		break;
	};
}

static inline void remote_name_information(int dev, bdaddr_t *sba, void *ptr)
{
	evt_remote_name_req_complete *evt = ptr;
	bdaddr_t dba;
	char name[249];

	memset(name, 0, sizeof(name));
	bacpy(&dba, &evt->bdaddr);

	if (!evt->status) {
		memcpy(name, evt->name, 248);
		write_device_name(sba, &dba, name);
	}

	hcid_dbus_remote_name(sba, &dba, evt->status, name);
}

static inline void remote_version_information(int dev, bdaddr_t *sba, void *ptr)
{
	evt_read_remote_version_complete *evt = ptr;
	bdaddr_t dba;

	if (evt->status)
		return;

	if (get_bdaddr(dev, sba, btohs(evt->handle), &dba) < 0)
		return;

	write_version_info(sba, &dba, btohs(evt->manufacturer),
				evt->lmp_ver, btohs(evt->lmp_subver));
}

static inline void inquiry_complete(int dev, bdaddr_t *sba, void *ptr)
{
	hcid_dbus_inquiry_complete(sba);
}

static inline void inquiry_result(int dev, bdaddr_t *sba, int plen, void *ptr)
{
	uint8_t num = *(uint8_t *) ptr++;
	int i;

	for (i = 0; i < num; i++) {
		inquiry_info *info = ptr;
		uint32_t class = info->dev_class[0]
			| (info->dev_class[1] << 8)
			| (info->dev_class[2] << 16);

		hcid_dbus_inquiry_result(sba, &info->bdaddr, class, 0);

		update_lastseen(sba, &info->bdaddr);

		ptr += INQUIRY_INFO_SIZE;
	}
}

static inline void inquiry_result_with_rssi(int dev, bdaddr_t *sba, int plen, void *ptr)
{
	uint8_t num = *(uint8_t *) ptr++;
	int i;

	if (!num)
		return;

	if ((plen - 1) / num == INQUIRY_INFO_WITH_RSSI_AND_PSCAN_MODE_SIZE) {
		for (i = 0; i < num; i++) {
			inquiry_info_with_rssi_and_pscan_mode *info = ptr;
			uint32_t class = info->dev_class[0]
				| (info->dev_class[1] << 8)
				| (info->dev_class[2] << 16);

			hcid_dbus_inquiry_result(sba, &info->bdaddr,
							class, info->rssi);

			update_lastseen(sba, &info->bdaddr);

			ptr += INQUIRY_INFO_WITH_RSSI_AND_PSCAN_MODE_SIZE;
		}
	} else {
		for (i = 0; i < num; i++) {
			inquiry_info_with_rssi *info = ptr;
			uint32_t class = info->dev_class[0]
				| (info->dev_class[1] << 8)
				| (info->dev_class[2] << 16);

			hcid_dbus_inquiry_result(sba, &info->bdaddr,
							class, info->rssi);

			update_lastseen(sba, &info->bdaddr);

			ptr += INQUIRY_INFO_WITH_RSSI_SIZE;
		}
	}
}

static inline void extended_inquiry_result(int dev, bdaddr_t *sba, int plen, void *ptr)
{
	uint8_t num = *(uint8_t *) ptr++;
	int i;

	for (i = 0; i < num; i++) {
		extended_inquiry_info *info = ptr;
		uint32_t class = info->dev_class[0]
			| (info->dev_class[1] << 8)
			| (info->dev_class[2] << 16);

		hcid_dbus_inquiry_result(sba, &info->bdaddr, class, info->rssi);

		update_lastseen(sba, &info->bdaddr);

		ptr += EXTENDED_INQUIRY_INFO_SIZE;
	}
}

static inline void remote_features_information(int dev, bdaddr_t *sba, void *ptr)
{
	evt_read_remote_features_complete *evt = ptr;
	bdaddr_t dba;

	if (evt->status)
		return;

	if (get_bdaddr(dev, sba, btohs(evt->handle), &dba) < 0)
		return;

	write_features_info(sba, &dba, evt->features);
}

static inline void name_resolve(int dev, bdaddr_t *bdaddr)
{
	remote_name_req_cp cp;

	memset(&cp, 0, sizeof(cp));
	bacpy(&cp.bdaddr, bdaddr);
	cp.pscan_rep_mode = 0x02;

	hci_send_cmd(dev, OGF_LINK_CTL, OCF_REMOTE_NAME_REQ,
						REMOTE_NAME_REQ_CP_SIZE, &cp);
}

static inline void conn_complete(int dev, bdaddr_t *sba, void *ptr)
{
	evt_conn_complete *evt = ptr;

	hcid_dbus_conn_complete(sba, evt->status, evt->handle, &evt->bdaddr);

	if (evt->status)
		return;

	update_lastused(sba, &evt->bdaddr);

	name_resolve(dev, &evt->bdaddr);
}

static inline void disconn_complete(int dev, bdaddr_t *sba, void *ptr)
{
	evt_disconn_complete *evt = ptr;

	hcid_dbus_disconn_complete(sba, evt->status, evt->handle, evt->reason);
}

static inline void auth_complete(int dev, bdaddr_t *sba, void *ptr)
{
	evt_auth_complete *evt = ptr;
	bdaddr_t dba;

	if (get_bdaddr(dev, sba, evt->handle, &dba) < 0) 
		return;

	hcid_dbus_bonding_created_complete(sba, &dba, evt->status);
}

static gboolean io_security_event(GIOChannel *chan, GIOCondition cond, gpointer data)
{
	unsigned char buf[HCI_MAX_EVENT_SIZE], *ptr = buf;
	struct hci_dev_info *di = (void *) data;
	int type, dev;
	size_t len;
	hci_event_hdr *eh;
	GIOError err;

	if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR)) {
		g_io_channel_close(chan);
		free(data);
		return FALSE;
	}

	if ((err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len))) {
		if (err == G_IO_ERROR_AGAIN)
			return TRUE;
		g_io_channel_close(chan);
		free(data);
		return FALSE;
	}

	type = *ptr++;

	if (type != HCI_EVENT_PKT)
		return TRUE;

	eh = (hci_event_hdr *) ptr;
	ptr += HCI_EVENT_HDR_SIZE;

	dev = g_io_channel_unix_get_fd(chan);

	ioctl(dev, HCIGETDEVINFO, (void *) di);

	if (hci_test_bit(HCI_RAW, &di->flags))
		return TRUE;

	switch (eh->evt) {
	case EVT_CMD_STATUS:
		cmd_status(dev, &di->bdaddr, ptr);
		break;

	case EVT_CMD_COMPLETE:
		cmd_complete(dev, &di->bdaddr, ptr);
		break;

	case EVT_REMOTE_NAME_REQ_COMPLETE:
		remote_name_information(dev, &di->bdaddr, ptr);
		break;

	case EVT_READ_REMOTE_VERSION_COMPLETE:
		remote_version_information(dev, &di->bdaddr, ptr);
		break;

	case EVT_READ_REMOTE_FEATURES_COMPLETE:
		remote_features_information(dev, &di->bdaddr, ptr);
		break;

	case EVT_INQUIRY_COMPLETE:
		inquiry_complete(dev, &di->bdaddr, ptr);
		break;

	case EVT_INQUIRY_RESULT:
		inquiry_result(dev, &di->bdaddr, eh->plen, ptr);
		break;

	case EVT_INQUIRY_RESULT_WITH_RSSI:
		inquiry_result_with_rssi(dev, &di->bdaddr, eh->plen, ptr);
		break;

	case EVT_EXTENDED_INQUIRY_RESULT:
		extended_inquiry_result(dev, &di->bdaddr, eh->plen, ptr);
		break;

	case EVT_CONN_COMPLETE:
		conn_complete(dev, &di->bdaddr, ptr);
		break;

	case EVT_DISCONN_COMPLETE:
		disconn_complete(dev, &di->bdaddr, ptr);
		break;

	case EVT_AUTH_COMPLETE:
		auth_complete(dev, &di->bdaddr, ptr);
		break;
	}

	if (hci_test_bit(HCI_SECMGR, &di->flags))
		return TRUE;

	switch (eh->evt) {
	case EVT_PIN_CODE_REQ:
		pin_code_request(dev, &di->bdaddr, (bdaddr_t *) ptr);
		break;

	case EVT_LINK_KEY_REQ:
		link_key_request(dev, &di->bdaddr, (bdaddr_t *) ptr);
		break;

	case EVT_LINK_KEY_NOTIFY:
		link_key_notify(dev, &di->bdaddr, ptr);
		break;

	case EVT_RETURN_LINK_KEYS:
		return_link_keys(dev, &di->bdaddr, ptr);
		break;
	}

	return TRUE;
}

void start_security_manager(int hdev)
{
	GIOChannel *chan = io_data[hdev].channel;
	struct hci_dev_info *di;
	struct hci_filter flt;
	read_stored_link_key_cp cp;
	int dev;

	if (chan)
		return;

	info("Starting security manager %d", hdev);

	if ((dev = hci_open_dev(hdev)) < 0) {
		error("Can't open device hci%d: %s (%d)",
						hdev, strerror(errno), errno);
		return;
	}

	/* Set filter */
	hci_filter_clear(&flt);
	hci_filter_set_ptype(HCI_EVENT_PKT, &flt);
	hci_filter_set_event(EVT_CMD_STATUS, &flt);
	hci_filter_set_event(EVT_CMD_COMPLETE, &flt);
	hci_filter_set_event(EVT_PIN_CODE_REQ, &flt);
	hci_filter_set_event(EVT_LINK_KEY_REQ, &flt);
	hci_filter_set_event(EVT_LINK_KEY_NOTIFY, &flt);
	hci_filter_set_event(EVT_RETURN_LINK_KEYS, &flt);
	hci_filter_set_event(EVT_REMOTE_NAME_REQ_COMPLETE, &flt);
	hci_filter_set_event(EVT_READ_REMOTE_VERSION_COMPLETE, &flt);
	hci_filter_set_event(EVT_READ_REMOTE_FEATURES_COMPLETE, &flt);
	hci_filter_set_event(EVT_INQUIRY_COMPLETE, &flt);
	hci_filter_set_event(EVT_INQUIRY_RESULT, &flt);
	hci_filter_set_event(EVT_INQUIRY_RESULT_WITH_RSSI, &flt);
	hci_filter_set_event(EVT_EXTENDED_INQUIRY_RESULT, &flt);
	hci_filter_set_event(EVT_CONN_COMPLETE, &flt);
	hci_filter_set_event(EVT_DISCONN_COMPLETE, &flt);
	hci_filter_set_event(EVT_AUTH_COMPLETE, &flt);
	if (setsockopt(dev, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
		error("Can't set filter on hci%d: %s (%d)",
						hdev, strerror(errno), errno);
		close(dev);
		return;
	}

	di = malloc(sizeof(*di));
	if (!di) {
		error("Can't allocate device info buffer: %s (%d)",
							strerror(errno), errno);
		close(dev);
		return;
	}

	di->dev_id = hdev;
	if (ioctl(dev, HCIGETDEVINFO, (void *)di)) {
		error("Can't get device info: %s (%d)",
							strerror(errno), errno);
		close(dev);
		return;
	}

	chan = g_io_channel_unix_new(dev);
	io_data[hdev].watch_id = g_io_add_watch(chan, G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
						io_security_event, (void *) di);

	io_data[hdev].channel = chan;
	io_data[hdev].pin_length = -1;

	if (hci_test_bit(HCI_RAW, &di->flags))
		return;

	bacpy(&cp.bdaddr, BDADDR_ANY);
	cp.read_all = 1;

	hci_send_cmd(dev, OGF_HOST_CTL, OCF_READ_STORED_LINK_KEY,
			READ_STORED_LINK_KEY_CP_SIZE, (void *) &cp);
}

void stop_security_manager(int hdev)
{
	GIOChannel *chan = io_data[hdev].channel;

	if (!chan)
		return;

	info("Stoping security manager %d", hdev);

	/* this is a bit sneaky. closing the fd will cause the event
	   loop to call us right back with G_IO_NVAL set, at which
	   point we will see it and clean things up */
	close(g_io_channel_unix_get_fd(chan));
	g_io_remove_watch(io_data[hdev].watch_id);
	io_data[hdev].watch_id = -1;
	io_data[hdev].channel = NULL;
	io_data[hdev].pin_length = -1;
}

void init_security_data(void)
{
	pairing = hcid.pairing;
}