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source: storage_xml.c @ ba3a8a5

1.2.3

Last change on this file since ba3a8a5 was 15d1469, checked in by Wilmer van der Gaast <wilmer@…>, at 2008-09-06T23:10:47Z
Really removing the gstdio.h include now to fully fix GLib 2.4 compatibility.
Property mode set to `100644`
File size: 14.2 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
32	#if GLIB_CHECK_VERSION(2,8,0)
33	#include <glib/gstdio.h>
34	#else
35	/* GLib < 2.8.0 doesn't have g_access, so just use the system access(). */
36	#include <unistd.h>
37	#define g_access access
38	#endif
39
40	typedef enum
41	{
42	XML_PASS_CHECK_ONLY = -1,
43	XML_PASS_UNKNOWN = 0,
44	XML_PASS_WRONG,
45	XML_PASS_OK
46	} xml_pass_st;
47
48	/* To make it easier later when extending the format: */
49	#define XML_FORMAT_VERSION 1
50
51	struct xml_parsedata
52	{
53	irc_t *irc;
54	char *current_setting;
55	account_t *current_account;
56	char *given_nick;
57	char *given_pass;
58	xml_pass_st pass_st;
59	};
60
61	static char xml_attr( const gchar attr_names, const gchar attr_values, const gchar key )
62	{
63	int i;
64
65	for( i = 0; attr_names[i]; i ++ )
66	if( g_strcasecmp( attr_names[i], key ) == 0 )
67	return (char*) attr_values[i];
68
69	return NULL;
70	}
71
72	static void xml_destroy_xd( gpointer data )
73	{
74	struct xml_parsedata *xd = data;
75
76	g_free( xd->given_nick );
77	g_free( xd->given_pass );
78	g_free( xd );
79	}
80
81	static void xml_start_element( GMarkupParseContext ctx, const gchar element_name, const gchar attr_names, const gchar attr_values, gpointer data, GError **error )
82	{
83	struct xml_parsedata *xd = data;
84	irc_t *irc = xd->irc;
85
86	if( g_strcasecmp( element_name, "user" ) == 0 )
87	{
88	char *nick = xml_attr( attr_names, attr_values, "nick" );
89	char *pass = xml_attr( attr_names, attr_values, "password" );
90	int st;
91
92	if( !nick \|\| !pass )
93	{
94	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
95	"Missing attributes for %s element", element_name );
96	}
97	else if( ( st = md5_verify_password( xd->given_pass, pass ) ) == -1 )
98	{
99	xd->pass_st = XML_PASS_WRONG;
100	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
101	"Error while decoding password attribute" );
102	}
103	else if( st == 0 )
104	{
105	if( xd->pass_st != XML_PASS_CHECK_ONLY )
106	xd->pass_st = XML_PASS_OK;
107	}
108	else
109	{
110	xd->pass_st = XML_PASS_WRONG;
111	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
112	"Password mismatch" );
113	}
114	}
115	else if( xd->pass_st < XML_PASS_OK )
116	{
117	/* Let's not parse anything else if we only have to check
118	the password. */
119	}
120	else if( g_strcasecmp( element_name, "account" ) == 0 )
121	{
122	char protocol, handle, server, password = NULL, *autoconnect;
123	char *pass_b64 = NULL;
124	unsigned char *pass_cr = NULL;
125	int pass_len;
126	struct prpl *prpl = NULL;
127
128	handle = xml_attr( attr_names, attr_values, "handle" );
129	pass_b64 = xml_attr( attr_names, attr_values, "password" );
130	server = xml_attr( attr_names, attr_values, "server" );
131	autoconnect = xml_attr( attr_names, attr_values, "autoconnect" );
132
133	protocol = xml_attr( attr_names, attr_values, "protocol" );
134	if( protocol )
135	prpl = find_protocol( protocol );
136
137	if( !handle \|\| !pass_b64 \|\| !protocol )
138	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
139	"Missing attributes for %s element", element_name );
140	else if( !prpl )
141	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
142	"Unknown protocol: %s", protocol );
143	else if( ( pass_len = base64_decode( pass_b64, (unsigned char**) &pass_cr ) ) &&
144	arc_decode( pass_cr, pass_len, &password, xd->given_pass ) )
145	{
146	xd->current_account = account_add( irc, prpl, handle, password );
147	if( server )
148	set_setstr( &xd->current_account->set, "server", server );
149	if( autoconnect )
150	set_setstr( &xd->current_account->set, "auto_connect", autoconnect );
151	}
152	else
153	{
154	/* Actually the _decode functions don't even return error codes,
155	but maybe they will later... */
156	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
157	"Error while decrypting account password" );
158	}
159
160	g_free( pass_cr );
161	g_free( password );
162	}
163	else if( g_strcasecmp( element_name, "setting" ) == 0 )
164	{
165	char *setting;
166
167	if( xd->current_setting )
168	{
169	g_free( xd->current_setting );
170	xd->current_setting = NULL;
171	}
172
173	if( ( setting = xml_attr( attr_names, attr_values, "name" ) ) )
174	xd->current_setting = g_strdup( setting );
175	else
176	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
177	"Missing attributes for %s element", element_name );
178	}
179	else if( g_strcasecmp( element_name, "buddy" ) == 0 )
180	{
181	char handle, nick;
182
183	handle = xml_attr( attr_names, attr_values, "handle" );
184	nick = xml_attr( attr_names, attr_values, "nick" );
185
186	if( xd->current_account && handle && nick )
187	{
188	nick_set( xd->current_account, handle, nick );
189	}
190	else
191	{
192	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
193	"Missing attributes for %s element", element_name );
194	}
195	}
196	else
197	{
198	g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_UNKNOWN_ELEMENT,
199	"Unkown element: %s", element_name );
200	}
201	}
202
203	static void xml_end_element( GMarkupParseContext ctx, const gchar element_name, gpointer data, GError **error )
204	{
205	struct xml_parsedata *xd = data;
206
207	if( g_strcasecmp( element_name, "setting" ) == 0 && xd->current_setting )
208	{
209	g_free( xd->current_setting );
210	xd->current_setting = NULL;
211	}
212	else if( g_strcasecmp( element_name, "account" ) == 0 )
213	{
214	xd->current_account = NULL;
215	}
216	}
217
218	static void xml_text( GMarkupParseContext ctx, const gchar text_orig, gsize text_len, gpointer data, GError **error )
219	{
220	char text[text_len+1];
221	struct xml_parsedata *xd = data;
222	irc_t *irc = xd->irc;
223
224	strncpy( text, text_orig, text_len );
225	text[text_len] = 0;
226
227	if( xd->pass_st < XML_PASS_OK )
228	{
229	/* Let's not parse anything else if we only have to check
230	the password, or if we didn't get the chance to check it
231	yet. */
232	}
233	else if( g_strcasecmp( g_markup_parse_context_get_element( ctx ), "setting" ) == 0 && xd->current_setting )
234	{
235	set_setstr( xd->current_account ? &xd->current_account->set : &irc->set,
236	xd->current_setting, (char*) text );
237	g_free( xd->current_setting );
238	xd->current_setting = NULL;
239	}
240	}
241
242	GMarkupParser xml_parser =
243	{
244	xml_start_element,
245	xml_end_element,
246	xml_text,
247	NULL,
248	NULL
249	};
250
251	static void xml_init( void )
252	{
253	if( g_access( global.conf->configdir, F_OK ) != 0 )
254	log_message( LOGLVL_WARNING, "The configuration directory `%s' does not exist. Configuration won't be saved.", global.conf->configdir );
255	else if( g_access( global.conf->configdir, F_OK ) != 0 \|\|
256	g_access( global.conf->configdir, W_OK ) != 0 )
257	log_message( LOGLVL_WARNING, "Permission problem: Can't read/write from/to `%s'.", global.conf->configdir );
258	}
259
260	static storage_status_t xml_load_real( irc_t irc, const char my_nick, const char *password, xml_pass_st action )
261	{
262	GMarkupParseContext *ctx;
263	struct xml_parsedata *xd;
264	char *fn, buf[512];
265	GError *gerr = NULL;
266	int fd, st;
267
268	xd = g_new0( struct xml_parsedata, 1 );
269	xd->irc = irc;
270	xd->given_nick = g_strdup( my_nick );
271	xd->given_pass = g_strdup( password );
272	xd->pass_st = action;
273	nick_lc( xd->given_nick );
274
275	fn = g_strdup_printf( "%s%s%s", global.conf->configdir, xd->given_nick, ".xml" );
276	if( ( fd = open( fn, O_RDONLY ) ) < 0 )
277	{
278	xml_destroy_xd( xd );
279	g_free( fn );
280	return STORAGE_NO_SUCH_USER;
281	}
282	g_free( fn );
283
284	ctx = g_markup_parse_context_new( &xml_parser, 0, xd, xml_destroy_xd );
285
286	while( ( st = read( fd, buf, sizeof( buf ) ) ) > 0 )
287	{
288	if( !g_markup_parse_context_parse( ctx, buf, st, &gerr ) \|\| gerr )
289	{
290	xml_pass_st pass_st = xd->pass_st;
291
292	g_markup_parse_context_free( ctx );
293	close( fd );
294
295	if( pass_st == XML_PASS_WRONG )
296	{
297	g_clear_error( &gerr );
298	return STORAGE_INVALID_PASSWORD;
299	}
300	else
301	{
302	if( gerr && irc )
303	irc_usermsg( irc, "Error from XML-parser: %s", gerr->message );
304
305	g_clear_error( &gerr );
306	return STORAGE_OTHER_ERROR;
307	}
308	}
309	}
310	/* Just to be sure... */
311	g_clear_error( &gerr );
312
313	g_markup_parse_context_free( ctx );
314	close( fd );
315
316	if( action == XML_PASS_CHECK_ONLY )
317	return STORAGE_OK;
318
319	return STORAGE_OK;
320	}
321
322	static storage_status_t xml_load( irc_t irc, const char password )
323	{
324	return xml_load_real( irc, irc->nick, password, XML_PASS_UNKNOWN );
325	}
326
327	static storage_status_t xml_check_pass( const char my_nick, const char password )
328	{
329	/* This is a little bit risky because we have to pass NULL for the
330	irc_t argument. This should be fine, if I didn't miss anything... */
331	return xml_load_real( NULL, my_nick, password, XML_PASS_CHECK_ONLY );
332	}
333
334	static int xml_printf( int fd, int indent, char *fmt, ... )
335	{
336	va_list params;
337	char *out;
338	char tabs[9] = "\t\t\t\t\t\t\t\t";
339	int len;
340
341	/* Maybe not very clean, but who needs more than 8 levels of indentation anyway? */
342	if( write( fd, tabs, indent <= 8 ? indent : 8 ) != indent )
343	return 0;
344
345	va_start( params, fmt );
346	out = g_markup_vprintf_escaped( fmt, params );
347	va_end( params );
348
349	len = strlen( out );
350	len -= write( fd, out, len );
351	g_free( out );
352
353	return len == 0;
354	}
355
356	static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data );
357
358	static storage_status_t xml_save( irc_t *irc, int overwrite )
359	{
360	char path[512], path2, pass_buf = NULL;
361	set_t *set;
362	account_t *acc;
363	int fd;
364	md5_byte_t pass_md5[21];
365	md5_state_t md5_state;
366
367	path2 = g_strdup( irc->nick );
368	nick_lc( path2 );
369	g_snprintf( path, sizeof( path ) - 2, "%s%s%s", global.conf->configdir, path2, ".xml" );
370	g_free( path2 );
371
372	if( !overwrite && g_access( path, F_OK ) == 0 )
373	return STORAGE_ALREADY_EXISTS;
374
375	strcat( path, "~" );
376	if( ( fd = open( path, O_WRONLY \| O_CREAT \| O_TRUNC, 0600 ) ) < 0 )
377	{
378	irc_usermsg( irc, "Error while opening configuration file." );
379	return STORAGE_OTHER_ERROR;
380	}
381
382	/* Generate a salted md5sum of the password. Use 5 bytes for the salt
383	(to prevent dictionary lookups of passwords) to end up with a 21-
384	byte password hash, more convenient for base64 encoding. */
385	random_bytes( pass_md5 + 16, 5 );
386	md5_init( &md5_state );
387	md5_append( &md5_state, (md5_byte_t*) irc->password, strlen( irc->password ) );
388	md5_append( &md5_state, pass_md5 + 16, 5 ); /* Add the salt. */
389	md5_finish( &md5_state, pass_md5 );
390	/* Save the hash in base64-encoded form. */
391	pass_buf = base64_encode( pass_md5, 21 );
392
393	if( !xml_printf( fd, 0, "<user nick=\"%s\" password=\"%s\" version=\"%d\">\n", irc->nick, pass_buf, XML_FORMAT_VERSION ) )
394	goto write_error;
395
396	g_free( pass_buf );
397
398	for( set = irc->set; set; set = set->next )
399	if( set->value && set->def )
400	if( !xml_printf( fd, 1, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) )
401	goto write_error;
402
403	for( acc = irc->accounts; acc; acc = acc->next )
404	{
405	unsigned char *pass_cr;
406	char *pass_b64;
407	int pass_len;
408
409	pass_len = arc_encode( acc->pass, strlen( acc->pass ), (unsigned char**) &pass_cr, irc->password, 12 );
410	pass_b64 = base64_encode( pass_cr, pass_len );
411	g_free( pass_cr );
412
413	if( !xml_printf( fd, 1, "<account protocol=\"%s\" handle=\"%s\" password=\"%s\" autoconnect=\"%d\"", acc->prpl->name, acc->user, pass_b64, acc->auto_connect ) )
414	{
415	g_free( pass_b64 );
416	goto write_error;
417	}
418	g_free( pass_b64 );
419
420	if( acc->server && acc->server[0] && !xml_printf( fd, 0, " server=\"%s\"", acc->server ) )
421	goto write_error;
422	if( !xml_printf( fd, 0, ">\n" ) )
423	goto write_error;
424
425	for( set = acc->set; set; set = set->next )
426	if( set->value && set->def && !( set->flags & ACC_SET_NOSAVE ) )
427	if( !xml_printf( fd, 2, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) )
428	goto write_error;
429
430	/* This probably looks pretty strange. g_hash_table_foreach
431	is quite a PITA already (but it can't get much better in
432	C without using #define, I'm afraid), and since it
433	doesn't seem to be possible to abort the foreach on write
434	errors, so instead let's use the _find function and
435	return TRUE on write errors. Which means, if we found
436	something, there was an error. :-) */
437	if( g_hash_table_find( acc->nicks, xml_save_nick, & fd ) )
438	goto write_error;
439
440	if( !xml_printf( fd, 1, "</account>\n" ) )
441	goto write_error;
442	}
443
444	if( !xml_printf( fd, 0, "</user>\n" ) )
445	goto write_error;
446
447	close( fd );
448
449	path2 = g_strndup( path, strlen( path ) - 1 );
450	if( rename( path, path2 ) != 0 )
451	{
452	irc_usermsg( irc, "Error while renaming temporary configuration file." );
453
454	g_free( path2 );
455	unlink( path );
456
457	return STORAGE_OTHER_ERROR;
458	}
459
460	g_free( path2 );
461
462	return STORAGE_OK;
463
464	write_error:
465	g_free( pass_buf );
466
467	irc_usermsg( irc, "Write error. Disk full?" );
468	close( fd );
469
470	return STORAGE_OTHER_ERROR;
471	}
472
473	static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data )
474	{
475	return !xml_printf( ( (int) data ), 2, "<buddy handle=\"%s\" nick=\"%s\" />\n", key, value );
476	}
477
478	static storage_status_t xml_remove( const char nick, const char password )
479	{
480	char s[512], *lc;
481	storage_status_t status;
482
483	status = xml_check_pass( nick, password );
484	if( status != STORAGE_OK )
485	return status;
486
487	lc = g_strdup( nick );
488	nick_lc( lc );
489	g_snprintf( s, 511, "%s%s%s", global.conf->configdir, lc, ".xml" );
490	g_free( lc );
491
492	if( unlink( s ) == -1 )
493	return STORAGE_OTHER_ERROR;
494
495	return STORAGE_OK;
496	}
497
498	storage_t storage_xml = {
499	.name = "xml",
500	.init = xml_init,
501	.check_pass = xml_check_pass,
502	.remove = xml_remove,
503	.load = xml_load,
504	.save = xml_save
505	};

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