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source: storage_xml.c @ 98de2cc

Last change on this file since 98de2cc was 5f5d433, checked in by Jelmer Vernooij <jelmer@…>, at 2008-04-02T14:17:37Z
Use GLib functions to check whether files exist, for extra portability.
Property mode set to `100644`
File size: 14.3 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2006 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/* Storage backend that uses an XMLish format for all data. */
8
9	/*
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License with
21	the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
22	if not, write to the Free Software Foundation, Inc., 59 Temple Place,
23	Suite 330, Boston, MA 02111-1307 USA
24	*/
25
26	#define BITLBEE_CORE
27	#include "bitlbee.h"
28	#include "base64.h"
29	#include "arc.h"
30	#include "md5.h"
31	#include <glib/gstdio.h>
32
33	typedef enum
34	{
35	XML_PASS_CHECK_ONLY = -1,
36	XML_PASS_UNKNOWN = 0,
37	XML_PASS_WRONG,
38	XML_PASS_OK
39	} xml_pass_st;
40
41	/* To make it easier later when extending the format: */
42	#define XML_FORMAT_VERSION 1
43
44	struct xml_parsedata
45	{
46	irc_t *irc;
47	char *current_setting;
48	account_t *current_account;
49	char *given_nick;
50	char *given_pass;
51	xml_pass_st pass_st;
52	};
53
54	static char xml_attr( const gchar attr_names, const gchar attr_values, const gchar key )
55	{
56	int i;
57
58	for( i = 0; attr_names[i]; i ++ )
59	if( g_strcasecmp( attr_names[i], key ) == 0 )
60	return (char*) attr_values[i];
61
62	return NULL;
63	}
64
65	static void xml_destroy_xd( gpointer data )
66	{
67	struct xml_parsedata *xd = data;
68
69	g_free( xd->given_nick );
70	g_free( xd->given_pass );
71	g_free( xd );
72	}
73
74	static void xml_start_element( GMarkupParseContext ctx, const gchar element_name, const gchar attr_names, const gchar attr_values, gpointer data, GError **error )
75	{
76	struct xml_parsedata *xd = data;
77	irc_t *irc = xd->irc;
78
79	if( g_strcasecmp( element_name, "user" ) == 0 )
80	{
81	char *nick = xml_attr( attr_names, attr_values, "nick" );
82	char *pass = xml_attr( attr_names, attr_values, "password" );
83	int st;
84
85	if( !nick \|\| !pass )
86	{
87	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
88	"Missing attributes for %s element", element_name );
89	}
90	else if( ( st = md5_verify_password( xd->given_pass, pass ) ) == -1 )
91	{
92	xd->pass_st = XML_PASS_WRONG;
93	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
94	"Error while decoding password attribute" );
95	}
96	else if( st == 0 )
97	{
98	if( xd->pass_st != XML_PASS_CHECK_ONLY )
99	xd->pass_st = XML_PASS_OK;
100	}
101	else
102	{
103	xd->pass_st = XML_PASS_WRONG;
104	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
105	"Password mismatch" );
106	}
107	}
108	else if( xd->pass_st < XML_PASS_OK )
109	{
110	/* Let's not parse anything else if we only have to check
111	the password. */
112	}
113	else if( g_strcasecmp( element_name, "account" ) == 0 )
114	{
115	char protocol, handle, server, password = NULL, *autoconnect;
116	char *pass_b64 = NULL;
117	unsigned char *pass_cr = NULL;
118	int pass_len;
119	struct prpl *prpl = NULL;
120
121	handle = xml_attr( attr_names, attr_values, "handle" );
122	pass_b64 = xml_attr( attr_names, attr_values, "password" );
123	server = xml_attr( attr_names, attr_values, "server" );
124	autoconnect = xml_attr( attr_names, attr_values, "autoconnect" );
125
126	protocol = xml_attr( attr_names, attr_values, "protocol" );
127	if( protocol )
128	prpl = find_protocol( protocol );
129
130	if( !handle \|\| !pass_b64 \|\| !protocol )
131	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
132	"Missing attributes for %s element", element_name );
133	else if( !prpl )
134	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
135	"Unknown protocol: %s", protocol );
136	else if( ( pass_len = base64_decode( pass_b64, (unsigned char**) &pass_cr ) ) &&
137	arc_decode( pass_cr, pass_len, &password, xd->given_pass ) )
138	{
139	xd->current_account = account_add( irc, prpl, handle, password );
140	if( server )
141	set_setstr( &xd->current_account->set, "server", server );
142	if( autoconnect )
143	set_setstr( &xd->current_account->set, "auto_connect", autoconnect );
144	}
145	else
146	{
147	/* Actually the _decode functions don't even return error codes,
148	but maybe they will later... */
149	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
150	"Error while decrypting account password" );
151	}
152
153	g_free( pass_cr );
154	g_free( password );
155	}
156	else if( g_strcasecmp( element_name, "setting" ) == 0 )
157	{
158	char *setting;
159
160	if( xd->current_setting )
161	{
162	g_free( xd->current_setting );
163	xd->current_setting = NULL;
164	}
165
166	if( ( setting = xml_attr( attr_names, attr_values, "name" ) ) )
167	xd->current_setting = g_strdup( setting );
168	else
169	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
170	"Missing attributes for %s element", element_name );
171	}
172	else if( g_strcasecmp( element_name, "buddy" ) == 0 )
173	{
174	char handle, nick;
175
176	handle = xml_attr( attr_names, attr_values, "handle" );
177	nick = xml_attr( attr_names, attr_values, "nick" );
178
179	if( xd->current_account && handle && nick )
180	{
181	nick_set( xd->current_account, handle, nick );
182	}
183	else
184	{
185	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
186	"Missing attributes for %s element", element_name );
187	}
188	}
189	else
190	{
191	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_UNKNOWN_ELEMENT,
192	"Unkown element: %s", element_name );
193	}
194	}
195
196	static void xml_end_element( GMarkupParseContext ctx, const gchar element_name, gpointer data, GError **error )
197	{
198	struct xml_parsedata *xd = data;
199
200	if( g_strcasecmp( element_name, "setting" ) == 0 && xd->current_setting )
201	{
202	g_free( xd->current_setting );
203	xd->current_setting = NULL;
204	}
205	else if( g_strcasecmp( element_name, "account" ) == 0 )
206	{
207	xd->current_account = NULL;
208	}
209	}
210
211	static void xml_text( GMarkupParseContext ctx, const gchar text_orig, gsize text_len, gpointer data, GError **error )
212	{
213	char text[text_len+1];
214	struct xml_parsedata *xd = data;
215	irc_t *irc = xd->irc;
216
217	strncpy( text, text_orig, text_len );
218	text[text_len] = 0;
219
220	if( xd->pass_st < XML_PASS_OK )
221	{
222	/* Let's not parse anything else if we only have to check
223	the password, or if we didn't get the chance to check it
224	yet. */
225	}
226	else if( g_strcasecmp( g_markup_parse_context_get_element( ctx ), "setting" ) == 0 && xd->current_setting )
227	{
228	set_setstr( xd->current_account ? &xd->current_account->set : &irc->set,
229	xd->current_setting, (char*) text );
230	g_free( xd->current_setting );
231	xd->current_setting = NULL;
232	}
233	}
234
235	GMarkupParser xml_parser =
236	{
237	xml_start_element,
238	xml_end_element,
239	xml_text,
240	NULL,
241	NULL
242	};
243
244	static void xml_init( void )
245	{
246	if( ! g_file_test( global.conf->configdir, G_FILE_TEST_EXISTS ) )
247	log_message( LOGLVL_WARNING, "The configuration directory `%s' does not exist. Configuration won't be saved.", global.conf->configdir );
248	else if( ! g_file_test( global.conf->configdir, G_FILE_TEST_EXISTS ) \|\| g_access( global.conf->configdir, W_OK ) != 0 )
249	log_message( LOGLVL_WARNING, "Permission problem: Can't read/write from/to `%s'.", global.conf->configdir );
250	}
251
252	static storage_status_t xml_load_real( const char my_nick, const char password, irc_t *irc, xml_pass_st action )
253	{
254	GMarkupParseContext *ctx;
255	struct xml_parsedata *xd;
256	char *fn, buf[512];
257	GError *gerr = NULL;
258	int fd, st;
259
260	if( irc && irc->status & USTATUS_IDENTIFIED )
261	return( 1 );
262
263	xd = g_new0( struct xml_parsedata, 1 );
264	xd->irc = irc;
265	xd->given_nick = g_strdup( my_nick );
266	xd->given_pass = g_strdup( password );
267	xd->pass_st = action;
268	nick_lc( xd->given_nick );
269
270	fn = g_strdup_printf( "%s%s%s", global.conf->configdir, xd->given_nick, ".xml" );
271	if( ( fd = open( fn, O_RDONLY ) ) < 0 )
272	{
273	xml_destroy_xd( xd );
274	g_free( fn );
275	return STORAGE_NO_SUCH_USER;
276	}
277	g_free( fn );
278
279	ctx = g_markup_parse_context_new( &xml_parser, 0, xd, xml_destroy_xd );
280
281	while( ( st = read( fd, buf, sizeof( buf ) ) ) > 0 )
282	{
283	if( !g_markup_parse_context_parse( ctx, buf, st, &gerr ) \|\| gerr )
284	{
285	xml_pass_st pass_st = xd->pass_st;
286
287	g_markup_parse_context_free( ctx );
288	close( fd );
289
290	if( pass_st == XML_PASS_WRONG )
291	{
292	g_clear_error( &gerr );
293	return STORAGE_INVALID_PASSWORD;
294	}
295	else
296	{
297	if( gerr && irc )
298	irc_usermsg( irc, "Error from XML-parser: %s", gerr->message );
299
300	g_clear_error( &gerr );
301	return STORAGE_OTHER_ERROR;
302	}
303	}
304	}
305	/* Just to be sure... */
306	g_clear_error( &gerr );
307
308	g_markup_parse_context_free( ctx );
309	close( fd );
310
311	if( action == XML_PASS_CHECK_ONLY )
312	return STORAGE_OK;
313
314	irc->status \|= USTATUS_IDENTIFIED;
315
316	return STORAGE_OK;
317	}
318
319	static storage_status_t xml_load( const char my_nick, const char password, irc_t *irc )
320	{
321	return xml_load_real( my_nick, password, irc, XML_PASS_UNKNOWN );
322	}
323
324	static storage_status_t xml_check_pass( const char my_nick, const char password )
325	{
326	/* This is a little bit risky because we have to pass NULL for the
327	irc_t argument. This should be fine, if I didn't miss anything... */
328	return xml_load_real( my_nick, password, NULL, XML_PASS_CHECK_ONLY );
329	}
330
331	static int xml_printf( int fd, int indent, char *fmt, ... )
332	{
333	va_list params;
334	char *out;
335	char tabs[9] = "\t\t\t\t\t\t\t\t";
336	int len;
337
338	/* Maybe not very clean, but who needs more than 8 levels of indentation anyway? */
339	if( write( fd, tabs, indent <= 8 ? indent : 8 ) != indent )
340	return 0;
341
342	va_start( params, fmt );
343	out = g_markup_vprintf_escaped( fmt, params );
344	va_end( params );
345
346	len = strlen( out );
347	len -= write( fd, out, len );
348	g_free( out );
349
350	return len == 0;
351	}
352
353	static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data );
354
355	static storage_status_t xml_save( irc_t *irc, int overwrite )
356	{
357	char path[512], path2, pass_buf = NULL;
358	set_t *set;
359	account_t *acc;
360	int fd;
361	md5_byte_t pass_md5[21];
362	md5_state_t md5_state;
363
364	if( irc->password == NULL )
365	{
366	irc_usermsg( irc, "Please register yourself if you want to save your settings." );
367	return STORAGE_OTHER_ERROR;
368	}
369
370	path2 = g_strdup( irc->nick );
371	nick_lc( path2 );
372	g_snprintf( path, sizeof( path ) - 2, "%s%s%s", global.conf->configdir, path2, ".xml" );
373	g_free( path2 );
374
375	if( !overwrite && g_file_test( path, G_FILE_TEST_EXISTS ) )
376	return STORAGE_ALREADY_EXISTS;
377
378	strcat( path, "~" );
379	if( ( fd = open( path, O_WRONLY \| O_CREAT \| O_TRUNC, 0600 ) ) < 0 )
380	{
381	irc_usermsg( irc, "Error while opening configuration file." );
382	return STORAGE_OTHER_ERROR;
383	}
384
385	/* Generate a salted md5sum of the password. Use 5 bytes for the salt
386	(to prevent dictionary lookups of passwords) to end up with a 21-
387	byte password hash, more convenient for base64 encoding. */
388	random_bytes( pass_md5 + 16, 5 );
389	md5_init( &md5_state );
390	md5_append( &md5_state, (md5_byte_t*) irc->password, strlen( irc->password ) );
391	md5_append( &md5_state, pass_md5 + 16, 5 ); /* Add the salt. */
392	md5_finish( &md5_state, pass_md5 );
393	/* Save the hash in base64-encoded form. */
394	pass_buf = base64_encode( pass_md5, 21 );
395
396	if( !xml_printf( fd, 0, "<user nick=\"%s\" password=\"%s\" version=\"%d\">\n", irc->nick, pass_buf, XML_FORMAT_VERSION ) )
397	goto write_error;
398
399	g_free( pass_buf );
400
401	for( set = irc->set; set; set = set->next )
402	if( set->value && set->def )
403	if( !xml_printf( fd, 1, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) )
404	goto write_error;
405
406	for( acc = irc->accounts; acc; acc = acc->next )
407	{
408	unsigned char *pass_cr;
409	char *pass_b64;
410	int pass_len;
411
412	pass_len = arc_encode( acc->pass, strlen( acc->pass ), (unsigned char**) &pass_cr, irc->password, 12 );
413	pass_b64 = base64_encode( pass_cr, pass_len );
414	g_free( pass_cr );
415
416	if( !xml_printf( fd, 1, "<account protocol=\"%s\" handle=\"%s\" password=\"%s\" autoconnect=\"%d\"", acc->prpl->name, acc->user, pass_b64, acc->auto_connect ) )
417	{
418	g_free( pass_b64 );
419	goto write_error;
420	}
421	g_free( pass_b64 );
422
423	if( acc->server && acc->server[0] && !xml_printf( fd, 0, " server=\"%s\"", acc->server ) )
424	goto write_error;
425	if( !xml_printf( fd, 0, ">\n" ) )
426	goto write_error;
427
428	for( set = acc->set; set; set = set->next )
429	if( set->value && set->def && !( set->flags & ACC_SET_NOSAVE ) )
430	if( !xml_printf( fd, 2, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) )
431	goto write_error;
432
433	/* This probably looks pretty strange. g_hash_table_foreach
434	is quite a PITA already (but it can't get much better in
435	C without using #define, I'm afraid), and since it
436	doesn't seem to be possible to abort the foreach on write
437	errors, so instead let's use the _find function and
438	return TRUE on write errors. Which means, if we found
439	something, there was an error. :-) */
440	if( g_hash_table_find( acc->nicks, xml_save_nick, & fd ) )
441	goto write_error;
442
443	if( !xml_printf( fd, 1, "</account>\n" ) )
444	goto write_error;
445	}
446
447	if( !xml_printf( fd, 0, "</user>\n" ) )
448	goto write_error;
449
450	close( fd );
451
452	path2 = g_strndup( path, strlen( path ) - 1 );
453	if( rename( path, path2 ) != 0 )
454	{
455	irc_usermsg( irc, "Error while renaming temporary configuration file." );
456
457	g_free( path2 );
458	unlink( path );
459
460	return STORAGE_OTHER_ERROR;
461	}
462
463	g_free( path2 );
464
465	return STORAGE_OK;
466
467	write_error:
468	g_free( pass_buf );
469
470	irc_usermsg( irc, "Write error. Disk full?" );
471	close( fd );
472
473	return STORAGE_OTHER_ERROR;
474	}
475
476	static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data )
477	{
478	return !xml_printf( ( (int) data ), 2, "<buddy handle=\"%s\" nick=\"%s\" />\n", key, value );
479	}
480
481	static storage_status_t xml_remove( const char nick, const char password )
482	{
483	char s[512];
484	storage_status_t status;
485
486	status = xml_check_pass( nick, password );
487	if( status != STORAGE_OK )
488	return status;
489
490	g_snprintf( s, 511, "%s%s%s", global.conf->configdir, nick, ".xml" );
491	if( unlink( s ) == -1 )
492	return STORAGE_OTHER_ERROR;
493
494	return STORAGE_OK;
495	}
496
497	storage_t storage_xml = {
498	.name = "xml",
499	.init = xml_init,
500	.check_pass = xml_check_pass,
501	.remove = xml_remove,
502	.load = xml_load,
503	.save = xml_save
504	};

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