plugins/sasl/sasl.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34/*

  Copyright (c) 2010 Samuel Lidén Borell <samuel@kodafritt.se>

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.

*/

#ifndef MISC_H
#define MISC_H

void secure_erase(void *ptr, size_t size);

#ifdef __G_LIB_H__
char *import_glib_string(gchar *gstr);
#endif

#endif
/* HexChat
 * Copyright (c) 2010 <ygrek@autistici.org>
 * Copyright (c) 2012 Berke Viktor.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/*
 * SASL authentication plugin for HexChat
 * Extremely primitive: only PLAIN, no error checking
 *
 * http://ygrek.org.ua/p/cap_sasl.html
 *
 * Docs:
 *  http://hg.atheme.org/charybdis/charybdis/file/6144f52a119b/doc/sasl.txt
 *  http://tools.ietf.org/html/rfc4422
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <glib.h>

#include "hexchat-plugin.h"

static hexchat_plugin *ph;   /* plugin handle */
static char name[] = "SASL";
static char desc[] = "SASL authentication plugin for HexChat";
static char version[] = "1.2";
static const char sasl_help[] = "SASL Usage:\n /SASL ADD <login> <password> <network>, enable/update SASL authentication for given network\n /SASL DEL <network>, disable SASL authentication for given network\n /SASL LIST, get the list of SASL-enabled networks\n";

struct sasl_info
{
	char const* login;
	char const* password;
	char const* network;
};

typedef struct sasl_info sasl_info;

static int
add_info (char const* login, char const* password, char const* network)
{
	char buffer[512];

	sprintf (buffer, "%s:%s", login, password);
	return hexchat_pluginpref_set_str (ph, network, buffer);
}

static int
del_info (char const* network)
{
	return hexchat_pluginpref_delete (ph, network);
}

static void
print_info ()
{
	char list[512];
	char* token;

	if (hexchat_pluginpref_list (ph, list))
	{
		hexchat_printf (ph, "%s\tSASL-enabled networks:", name);
		hexchat_printf (ph, "%s\t----------------------", name);
		token = strtok (list, ",");
		while (token != NULL)
		{
			hexchat_printf (ph, "%s\t%s", name, token);
			token = strtok (NULL, ",");
		}
	}
	else
	{
		hexchat_printf (ph, "%s\tThere are no SASL-enabled networks currently", name);
	}
}

static sasl_info*
find_info (char const* network)
{
	char buffer[512];
	char* token;
	sasl_info* cur = (sasl_info*) malloc (sizeof (sasl_info));

	if (hexchat_pluginpref_get_str (ph, network, buffer))
	{
		token = strtok (buffer, ":");
		cur->login = g_strdup (token);
		token = strtok (NULL, ":");
		cur->password = g_strdup (token);
		cur->network = g_strdup (network);

		return cur;
	}

	return NULL;
}

static sasl_info*
get_info (void)
{
	const char* name;
	name = hexchat_get_info (ph, "network");

	if (name)
	{
		return find_info (name);
	}
	else
	{
		return NULL;
	}
}

static int
authend_cb (char *word[], char *word_eol[], void *userdata)
{
	if (get_info ())
	{
		/* omit cryptic server message parts */
		hexchat_printf (ph, "%s\t%s\n", name, ++word_eol[4]);
		hexchat_commandf (ph, "QUOTE CAP END");
	}

	return HEXCHAT_EAT_ALL;
}

/*
static int
disconnect_cb (char *word[], void *userdata)
{
	hexchat_printf (ph, "disconnected\n");
	return HEXCHAT_EAT_NONE;
}
*/

static int
server_cb (char *word[], char *word_eol[], void *userdata)
{
	size_t len;
	char* buf;
	char* enc;
	sasl_info* p;

	if (strcmp ("AUTHENTICATE", word[1]) == 0 && strcmp ("+", word[2]) == 0)
	{
		p = get_info ();

		if (!p)
		{
			return HEXCHAT_EAT_NONE;
		}

		hexchat_printf (ph, "%s\tAuthenticating as %s\n", name, p->login);

		len = strlen (p->login) * 2 + 2 + strlen (p->password);
		buf = (char*) malloc (len + 1);
		strcpy (buf, p->login);
		strcpy (buf + strlen (p->login) + 1, p->login);
		strcpy (buf + strlen (p->login) * 2 + 2, p->password);
		enc = g_base64_encode ((unsigned char*) buf, len);

		/* hexchat_printf (ph, "AUTHENTICATE %s\}", enc); */
		hexchat_commandf (ph, "QUOTE AUTHENTICATE %s", enc);

		free (enc);
		free (buf);

		return HEXCHAT_EAT_ALL;
	}

	return HEXCHAT_EAT_NONE;
}

static int
cap_cb (char *word[], char *word_eol[], void *userdata)
{
	if (get_info ())
	{
		/* FIXME test sasl cap */
		/* this is visible in the rawlog in case someone needs it, otherwise it's just noise */
		/* hexchat_printf (ph, "%s\t%s\n", name, word_eol[1]); */
		hexchat_commandf (ph, "QUOTE AUTHENTICATE PLAIN");
	}

	return HEXCHAT_EAT_ALL;
}

static int
sasl_cmd_cb (char *word[], char *word_eol[], void *userdata)
{
	const char* login;
	const char* password;
	const char* network;
	const char* mode = word[2];

	if (!g_ascii_strcasecmp ("ADD", mode))
	{
		login = word[3];
		password = word[4];
		network = word_eol[5];

		if (!network || !*network)	/* only check for the last word, if it's there, the previous ones will be there, too */
		{
			hexchat_printf (ph, "%s", sasl_help);
			return HEXCHAT_EAT_ALL;
		}

		if (add_info (login, password, network))
		{
			hexchat_printf (ph, "%s\tEnabled SASL authentication for the \"%s\" network\n", name, network);
		}
		else
		{
			hexchat_printf (ph, "%s\tFailed to enable SASL authentication for the \"%s\" network\n", name, network);
		}

		return HEXCHAT_EAT_ALL;
	}
	else if (!g_ascii_strcasecmp ("DEL", mode))
	{
		network = word_eol[3];

		if (!network || !*network)
		{
			hexchat_printf (ph, "%s", sasl_help);
			return HEXCHAT_EAT_ALL;
		}

		if (del_info (network))
		{
			hexchat_printf (ph, "%s\tDisabled SASL authentication for the \"%s\" network\n", name, network);
		}
		else
		{
			hexchat_printf (ph, "%s\tFailed to disable SASL authentication for the \"%s\" network\n", name, network);
		}

		return HEXCHAT_EAT_ALL;
	}
	else if (!g_ascii_strcasecmp ("LIST", mode))
	{
		print_info ();
		return HEXCHAT_EAT_ALL;
	}
	else
	{
		hexchat_printf (ph, "%s", sasl_help);
		return HEXCHAT_EAT_ALL;
	}
}

static int
connect_cb (char *word[], void *userdata)
{
	if (get_info ())
	{
		hexchat_printf (ph, "%s\tSASL enabled\n", name);
		hexchat_commandf (ph, "QUOTE CAP REQ :sasl");
	}

	return HEXCHAT_EAT_NONE;
}

int
hexchat_plugin_init (hexchat_plugin *plugin_handle, char **plugin_name, char **plugin_desc, char **plugin_version, char *arg)
{
	/* we need to save this for use with any hexchat_* functions */
	ph = plugin_handle;

	/* tell HexChat our info */
	*plugin_name = name;
	*plugin_desc = desc;
	*plugin_version = version;

	hexchat_hook_command (ph, "SASL", HEXCHAT_PRI_NORM, sasl_cmd_cb, sasl_help, 0);
	hexchat_hook_print (ph, "Connected", HEXCHAT_PRI_NORM, connect_cb, NULL);
	/* hexchat_hook_print (ph, "Disconnected", HEXCHAT_PRI_NORM, disconnect_cb, NULL); */
	hexchat_hook_server (ph, "CAP", HEXCHAT_PRI_NORM, cap_cb, NULL);
	hexchat_hook_server (ph, "RAW LINE", HEXCHAT_PRI_NORM, server_cb, NULL);
	hexchat_hook_server (ph, "903", HEXCHAT_PRI_NORM, authend_cb, NULL);
	hexchat_hook_server (ph, "904", HEXCHAT_PRI_NORM, authend_cb, NULL);
	hexchat_hook_server (ph, "905", HEXCHAT_PRI_NORM, authend_cb, NULL);
	hexchat_hook_server (ph, "906", HEXCHAT_PRI_NORM, authend_cb, NULL);
	hexchat_hook_server (ph, "907", HEXCHAT_PRI_NORM, authend_cb, NULL);

	hexchat_printf (ph, "%s plugin loaded\n", name);

	return 1;
}

int
hexchat_plugin_deinit (void)
{
	hexchat_printf (ph, "%s plugin unloaded\n", name);
	return 1;
}