/***************************************************************************\
*                                                                           *
*  BitlBee - An IRC to IM gateway                                           *
*  Simple (but secure) ArcFour implementation for safer password storage.   *
*                                                                           *
*  Copyright 2006 Wilmer van der Gaast <wilmer@gaast.net>                   *
*                                                                           *
*  This library is free software; you can redistribute it and/or            *
*  modify it under the terms of the GNU Lesser General Public               *
*  License as published by the Free Software Foundation, version            *
*  2.1.                                                                     *
*                                                                           *
*  This library 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        *
*  Lesser General Public License for more details.                          *
*                                                                           *
*  You should have received a copy of the GNU Lesser General Public License *
*  along with this library; if not, write to the Free Software Foundation,  *
*  Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA           *
*                                                                           *
\***************************************************************************/

/* 
   This file implements ArcFour-encryption, which will mainly be used to
   save IM passwords safely in the new XML-format. Possibly other uses will
   come up later. It's supposed to be quite reliable (thanks to the use of a
   6-byte IV/seed), certainly compared to the old format. The only realistic
   way to crack BitlBee passwords now is to use a sniffer to get your hands
   on the user's password.
   
   If you see that something's wrong in this implementation (I asked a
   couple of people to look at it already, but who knows), please tell me.
   
   The reason I picked ArcFour is because it's pretty simple but effective,
   so it will work without adding several KBs or an extra library dependency.
   
   (ArcFour is an RC4-compatible cipher. See for details:
   http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt)
*/


#include <glib.h>
#include <gmodule.h>
#include <stdlib.h>
#include <string.h>
#include "misc.h"
#include "arc.h"

/* Add some seed to the password, to make sure we *never* use the same key.
   This defines how many bytes we use as a seed. */
#define ARC_IV_LEN 6

/* To defend against a "Fluhrer, Mantin and Shamir attack", it is recommended
   to shuffle S[] just a bit more before you start to use it. This defines how
   many bytes we'll request before we'll really use them for encryption. */
#define ARC_CYCLES 1024

struct arc_state *arc_keymaker( unsigned char *key, int kl, int cycles )
{
	struct arc_state *st;
	int i, j, tmp;
	unsigned char S2[256];
	
	st = g_malloc( sizeof( struct arc_state ) );
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/*
 * gaim
 *
 * Copyright (C) 1998-1999, Mark Spencer <markster@marko.net>
 * Copyright (C) 2002-2004, Wilmer van der Gaast, Jelmer Vernooij
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#define BITLBEE_CORE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#else
#include "sock.h"
#define ETIMEDOUT WSAETIMEDOUT
#define EINPROGRESS WSAEINPROGRESS
#endif
#include <fcntl.h>
#include <errno.h>
#include "nogaim.h"
#include "proxy.h"
#include "base64.h"

char proxyhost[128] = "";
int proxyport = 0;
int proxytype = PROXY_NONE;
char proxyuser[128] = "";
char proxypass[128] = "";

struct PHB {
	b_event_handler func, proxy_func;
	gpointer data, proxy_data;
	char *host;
	int port;
	int fd;
	gint inpa;
};



static struct sockaddr_in *gaim_gethostbyname(const char *host, int port)
{
	static struct sockaddr_in sin;

	if (!inet_aton(host, &sin.sin_addr)) {
		struct hostent *hp;
		if (!(hp = gethostbyname(host))) {
			return NULL;
		}
		memset(&sin, 0, sizeof(struct sockaddr_in));
		memcpy(&sin.sin_addr.s_addr, hp->h_addr, hp->h_length);
		sin.sin_family = hp->h_addrtype;
	} else
		sin.sin_family = AF_INET;
	sin.sin_port = htons(port);

	return &sin;
}

static gboolean gaim_io_connected(gpointer data, gint source, b_input_condition cond)
{
	struct PHB *phb = data;
	unsigned int len;
	int error = ETIMEDOUT;
	len = sizeof(error);
	
#ifndef _WIN32
	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
		closesocket(source);
		b_event_remove(phb->inpa);
		if( phb->proxy_func )
			phb->proxy_func(phb->proxy_data, -1, GAIM_INPUT_READ);
		else {
			phb->func(phb->data, -1, GAIM_INPUT_READ);
			g_free(phb);
		}
		return FALSE;
	}
#endif
	sock_make_blocking(source);
	b_event_remove(phb->inpa);
	if( phb->proxy_func )
		phb->proxy_func(phb->proxy_data, source, GAIM_INPUT_READ);
	else {
		phb->func(phb->data, source, GAIM_INPUT_READ);
		g_free(phb);
	}
	
	return FALSE;
}

static int proxy_connect_none(const char *host, unsigned short port, struct PHB *phb)
{
	struct sockaddr_in *sin;
	int fd = -1;

	if (!(sin = gaim_gethostbyname(host, port))) {
		g_free(phb);
		return -1;
	}

	if ((fd = socket(sin->sin_family, SOCK_STREAM, 0)) < 0) {
		g_free(phb);
		return -1;
	}

	sock_make_nonblocking(fd);
	
	event_debug("proxy_connect_none( \"%s\", %d ) = %d\n", host, port, fd);
	
	if (connect(fd, (struct sockaddr *)sin, sizeof(*sin)) < 0) {
		if (sockerr_again()) {
			phb->inpa = b_input_add(fd, GAIM_INPUT_WRITE, gaim_io_connected, phb);
			phb->fd = fd;
		} else {
			closesocket(fd);
			g_free(phb);
			return -1;
		}
	}

	return fd;
}


/* Connecting to HTTP proxies */

#define HTTP_GOODSTRING "HTTP/1.0 200 Connection established"
#define HTTP_GOODSTRING2 "HTTP/1.1 200 Connection established"

static gboolean http_canread(gpointer data, gint source, b_input_condition cond)
{
	int nlc = 0;
	int pos = 0;
	struct PHB *phb = data;
	char inputline[8192];

	b_event_remove(phb->inpa);

	while ((pos < sizeof(inputline)-1) && (nlc != 2) && (read(source, &inputline[pos++], 1) == 1)) {
		if (inputline[pos - 1] == '\n')
			nlc++;
		else if (inputline[pos - 1] != '\r')
			nlc = 0;
	}
	inputline[pos] = '\0';

	if ((memcmp(HTTP_GOODSTRING, inputline, strlen(HTTP_GOODSTRING)) == 0) ||
	    (memcmp(HTTP_GOODSTRING2, inputline, strlen(HTTP_GOODSTRING2)) == 0)) {
		phb->func(phb->data, source, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	close(source);
	phb->func(phb->data, -1, GAIM_INPUT_READ);
	g_free(phb->host);
	g_free(phb);
	
	return FALSE;
}

static gboolean http_canwrite(gpointer data, gint source, b_input_condition cond)
{
	char cmd[384];
	struct PHB *phb = data;
	unsigned int len;
	int error = ETIMEDOUT;
	if (phb->inpa > 0)
		b_event_remove(phb->inpa);
	len = sizeof(error);
	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}
	sock_make_blocking(source);

	g_snprintf(cmd, sizeof(cmd), "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n", phb->host, phb->port,
		   phb->host, phb->port);
	if (send(source, cmd, strlen(cmd), 0) < 0) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	if (proxyuser && *proxyuser) {
		char *t1, *t2;
		t1 = g_strdup_printf("%s:%s", proxyuser, proxypass);
		t2 = tobase64(t1);
		g_free(t1);
		g_snprintf(cmd, sizeof(cmd), "Proxy-Authorization: Basic %s\r\n", t2);
		g_free(t2);
		if (send(source, cmd, strlen(cmd), 0) < 0) {
			close(source);
			phb->func(phb->data, -1, GAIM_INPUT_READ);
			g_free(phb->host);
			g_free(phb);
			return FALSE;
		}
	}

	g_snprintf(cmd, sizeof(cmd), "\r\n");
	if (send(source, cmd, strlen(cmd), 0) < 0) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	phb->inpa = b_input_add(source, GAIM_INPUT_READ, http_canread, phb);
	
	return FALSE;
}

static int proxy_connect_http(const char *host, unsigned short port, struct PHB *phb)
{
	phb->host = g_strdup(host);
	phb->port = port;
	phb->proxy_func = http_canwrite;
	phb->proxy_data = phb;
	
	return( proxy_connect_none( proxyhost, proxyport, phb ) );
}


/* Connecting to SOCKS4 proxies */

static gboolean s4_canread(gpointer data, gint source, b_input_condition cond)
{
	unsigned char packet[12];
	struct PHB *phb = data;

	b_event_remove(phb->inpa);

	memset(packet, 0, sizeof(packet));
	if (read(source, packet, 9) >= 4 && packet[1] == 90) {
		phb->func(phb->data, source, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	close(source);
	phb->func(phb->data, -1, GAIM_INPUT_READ);
	g_free(phb->host);
	g_free(phb);
	
	return FALSE;
}

static gboolean s4_canwrite(gpointer data, gint source, b_input_condition cond)
{
	unsigned char packet[12];
	struct hostent *hp;
	struct PHB *phb = data;
	unsigned int len;
	int error = ETIMEDOUT;
	if (phb->inpa > 0)
		b_event_remove(phb->inpa);
	len = sizeof(error);
	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}
	sock_make_blocking(source);

	/* XXX does socks4 not support host name lookups by the proxy? */
	if (!(hp = gethostbyname(phb->host))) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	packet[0] = 4;
	packet[1] = 1;
	packet[2] = phb->port >> 8;
	packet[3] = phb->port & 0xff;
	packet[4] = (unsigned char)(hp->h_addr_list[0])[0];
	packet[5] = (unsigned char)(hp->h_addr_list[0])[1];
	packet[6] = (unsigned char)(hp->h_addr_list[0])[2];
	packet[7] = (unsigned char)(hp->h_addr_list[0])[3];
	packet[8] = 0;
	if (write(source, packet, 9) != 9) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	phb->inpa = b_input_add(source, GAIM_INPUT_READ, s4_canread, phb);
	
	return FALSE;
}

static int proxy_connect_socks4(const char *host, unsigned short port, struct PHB *phb)
{
	phb->host = g_strdup(host);
	phb->port = port;
	phb->proxy_func = s4_canwrite;
	phb->proxy_data = phb;
	
	return( proxy_connect_none( proxyhost, proxyport, phb ) );
}


/* Connecting to SOCKS5 proxies */

static gboolean s5_canread_again(gpointer data, gint source, b_input_condition cond)
{
	unsigned char buf[512];
	struct PHB *phb = data;

	b_event_remove(phb->inpa);

	if (read(source, buf, 10) < 10) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}
	if ((buf[0] != 0x05) || (buf[1] != 0x00)) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	phb->func(phb->data, source, GAIM_INPUT_READ);
	g_free(phb->host);
	g_free(phb);
	
	return FALSE;
}

static void s5_sendconnect(gpointer data, gint source)
{
	unsigned char buf[512];
	struct PHB *phb = data;
	int hlen = strlen(phb->host);
	
	buf[0] = 0x05;
	buf[1] = 0x01;		/* CONNECT */
	buf[2] = 0x00;		/* reserved */
	buf[3] = 0x03;		/* address type -- host name */
	buf[4] = hlen;
	memcpy(buf + 5, phb->host, hlen);
	buf[5 + strlen(phb->host)] = phb->port >> 8;
	buf[5 + strlen(phb->host) + 1] = phb->port & 0xff;

	if (write(source, buf, (5 + strlen(phb->host) + 2)) < (5 + strlen(phb->host) + 2)) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return;
	}

	phb->inpa = b_input_add(source, GAIM_INPUT_READ, s5_canread_again, phb);
}

static gboolean s5_readauth(gpointer data, gint source, b_input_condition cond)
{
	unsigned char buf[512];
	struct PHB *phb = data;

	b_event_remove(phb->inpa);

	if (read(source, buf, 2) < 2) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	if ((buf[0] != 0x01) || (buf[1] != 0x00)) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	s5_sendconnect(phb, source);
	
	return FALSE;
}

static gboolean s5_canread(gpointer data, gint source, b_input_condition cond)
{
	unsigned char buf[512];
	struct PHB *phb = data;

	b_event_remove(phb->inpa);

	if (read(source, buf, 2) < 2) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	if ((buf[0] != 0x05) || (buf[1] == 0xff)) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	if (buf[1] == 0x02) {
		unsigned int i = strlen(proxyuser), j = strlen(proxypass);
		buf[0] = 0x01;	/* version 1 */
		buf[1] = i;
		memcpy(buf + 2, proxyuser, i);
		buf[2 + i] = j;
		memcpy(buf + 2 + i + 1, proxypass, j);
		if (write(source, buf, 3 + i + j) < 3 + i + j) {
			close(source);
			phb->func(phb->data, -1, GAIM_INPUT_READ);
			g_free(phb->host);
			g_free(phb);
			return FALSE;
		}

		phb->inpa = b_input_add(source, GAIM_INPUT_READ, s5_readauth, phb);
	} else {
		s5_sendconnect(phb, source);
	}
	
	return FALSE;
}

static gboolean s5_canwrite(gpointer data, gint source, b_input_condition cond)
{
	unsigned char buf[512];
	int i;
	struct PHB *phb = data;
	unsigned int len;
	int error = ETIMEDOUT;
	if (phb->inpa > 0)
		b_event_remove(phb->inpa);
	len = sizeof(error);
	if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}
	sock_make_blocking(source);

	i = 0;
	buf[0] = 0x05;		/* SOCKS version 5 */
	if (proxyuser[0]) {
		buf[1] = 0x02;	/* two methods */
		buf[2] = 0x00;	/* no authentication */
		buf[3] = 0x02;	/* username/password authentication */
		i = 4;
	} else {
		buf[1] = 0x01;
		buf[2] = 0x00;
		i = 3;
	}

	if (write(source, buf, i) < i) {
		close(source);
		phb->func(phb->data, -1, GAIM_INPUT_READ);
		g_free(phb->host);
		g_free(phb);
		return FALSE;
	}

	phb->inpa = b_input_add(source, GAIM_INPUT_READ, s5_canread, phb);
	
	return FALSE;
}

static int proxy_connect_socks5(const char *host, unsigned short port, struct PHB *phb)
{
	phb->host = g_strdup(host);
	phb->port = port;
	phb->proxy_func = s5_canwrite;
	phb->proxy_data = phb;
	
	return( proxy_connect_none( proxyhost, proxyport, phb ) );
}


/* Export functions */

int proxy_connect(const char *host, int port, b_event_handler func, gpointer data)
{
	struct PHB *phb;
	
	if (!host || !port || (port == -1) || !func || strlen(host) > 128) {
		return -1;
	}
	
	phb = g_new0(struct PHB, 1);
	phb->func = func;
	phb->data = data;
	
	if ((proxytype == PROXY_NONE) || !proxyhost || !proxyhost[0] || !proxyport || (proxyport == -1))
		return proxy_connect_none(host, port, phb);
	else if (proxytype == PROXY_HTTP)
		return proxy_connect_http(host, port, phb);
	else if (proxytype == PROXY_SOCKS4)
		return proxy_connect_socks4(host, port, phb);
	else if (proxytype == PROXY_SOCKS5)
		return proxy_connect_socks5(host, port, phb);
	
	if (phb->host) g_free(phb);
	g_free(phb);
	return -1;
}