aboutsummaryrefslogtreecommitdiffstats
path: root/res/res_http_post.c
blob: 0f2373730731ccc4acfbd3f0fa0a1949ebb64e7d (plain)
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
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file 
 * \brief HTTP POST upload support for Asterisk HTTP server
 *
 * \author Terry Wilson <twilson@digium.com
 *
 * \ref AstHTTP - AMI over the http protocol
 */

/*** MODULEINFO
	<depend>gmime</depend>
 ***/


#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include <sys/stat.h>
#include <fcntl.h>
#include <gmime/gmime.h>
#if defined (__OpenBSD__) || defined(__FreeBSD__)
#include <libgen.h>
#endif

#include "asterisk/linkedlists.h"
#include "asterisk/http.h"
#include "asterisk/paths.h"	/* use ast_config_AST_DATA_DIR */
#include "asterisk/tcptls.h"
#include "asterisk/manager.h"
#include "asterisk/cli.h"
#include "asterisk/module.h"
#include "asterisk/ast_version.h"

#define MAX_PREFIX 80

/* gmime 2.4 provides a newer interface. */
#ifdef GMIME_TYPE_CONTENT_TYPE
#define AST_GMIME_VER_24
#endif

/* just a little structure to hold callback info for gmime */
struct mime_cbinfo {
	int count;
	const char *post_dir;
};

/* all valid URIs must be prepended by the string in prefix. */
static char prefix[MAX_PREFIX];

static void post_raw(GMimePart *part, const char *post_dir, const char *fn)
{
	char filename[PATH_MAX];
	GMimeDataWrapper *content;
	GMimeStream *stream;
	int fd;

	snprintf(filename, sizeof(filename), "%s/%s", post_dir, fn);

	ast_debug(1, "Posting raw data to %s\n", filename);

	if ((fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666)) == -1) {
		ast_log(LOG_WARNING, "Unable to open %s for writing file from a POST!\n", filename);

		return;
	}

	stream = g_mime_stream_fs_new(fd);

	content = g_mime_part_get_content_object(part);
	g_mime_data_wrapper_write_to_stream(content, stream);
	g_mime_stream_flush(stream);

#ifndef AST_GMIME_VER_24
	g_object_unref(content);
#endif
	g_object_unref(stream);
}

static GMimeMessage *parse_message(FILE *f)
{
	GMimeMessage *message;
	GMimeParser *parser;
	GMimeStream *stream;

	stream = g_mime_stream_file_new(f);

	parser = g_mime_parser_new_with_stream(stream);
	g_mime_parser_set_respect_content_length(parser, 1);
	
	g_object_unref(stream);

	message = g_mime_parser_construct_message(parser);

	g_object_unref(parser);

	return message;
}

#ifdef AST_GMIME_VER_24
static void process_message_callback(GMimeObject *parent, GMimeObject *part, gpointer user_data)
#else
static void process_message_callback(GMimeObject *part, gpointer user_data)
#endif
{
	struct mime_cbinfo *cbinfo = user_data;

	cbinfo->count++;

	/* We strip off the headers before we get here, so should only see GMIME_IS_PART */
	if (GMIME_IS_MESSAGE_PART(part)) {
		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PART\n");
		return;
	} else if (GMIME_IS_MESSAGE_PARTIAL(part)) {
		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MESSAGE_PARTIAL\n");
		return;
	} else if (GMIME_IS_MULTIPART(part)) {
#ifndef AST_GMIME_VER_24
		GList *l;

		ast_log(LOG_WARNING, "Got unexpected GMIME_IS_MULTIPART, trying to process subparts\n");
		l = GMIME_MULTIPART(part)->subparts;
		while (l) {
			process_message_callback(l->data, cbinfo);
			l = l->next;
		}
#else
		ast_log(LOG_WARNING, "Got unexpected MIME subpart.\n");
#endif
	} else if (GMIME_IS_PART(part)) {
		const char *filename;

		if (ast_strlen_zero(filename = g_mime_part_get_filename(GMIME_PART(part)))) {
			ast_debug(1, "Skipping part with no filename\n");
			return;
		}

		post_raw(GMIME_PART(part), cbinfo->post_dir, filename);
	} else {
		ast_log(LOG_ERROR, "Encountered unknown MIME part. This should never happen!\n");
	}
}

static int process_message(GMimeMessage *message, const char *post_dir)
{
	struct mime_cbinfo cbinfo = {
		.count = 0,
		.post_dir = post_dir,
	};

#ifdef AST_GMIME_VER_24
	g_mime_message_foreach(message, process_message_callback, &cbinfo);
#else
	g_mime_message_foreach_part(message, process_message_callback, &cbinfo);
#endif

	return cbinfo.count;
}

/* Find a sequence of bytes within a binary array. */
static int find_sequence(char * inbuf, int inlen, char * matchbuf, int matchlen)
{
	int current;
	int comp;
	int found = 0;

	for (current = 0; current < inlen-matchlen; current++, inbuf++) {
		if (*inbuf == *matchbuf) {
			found=1;
			for (comp = 1; comp < matchlen; comp++) {
				if (inbuf[comp] != matchbuf[comp]) {
					found = 0;
					break;
				}
			}
			if (found) {
				break;
			}
		}
	}
	if (found) {
		return current;
	} else {
		return -1;
	}
}

/*
* The following is a work around to deal with how IE7 embeds the local file name
* within the Mime header using full WINDOWS file path with backslash directory delimiters.
* This section of code attempts to isolate the directory path and remove it
* from what is written into the output file.  In addition, it changes
* esc chars (i.e. backslashes) to forward slashes.
* This function has two modes.  The first to find a boundary marker.  The
* second is to find the filename immediately after the boundary.
*/
static int readmimefile(FILE * fin, FILE * fout, char * boundary, int contentlen)
{
	int find_filename = 0;
	char buf[4096];
	int marker;
	int x;
	int char_in_buf = 0;
	int num_to_read;
	int boundary_len;
	char * path_end, * path_start, * filespec;

	if (NULL == fin || NULL == fout || NULL == boundary || 0 >= contentlen) {
		return -1;
	}

	boundary_len = strlen(boundary);
	while (0 < contentlen || 0 < char_in_buf) {
		/* determine how much I will read into the buffer */
		if (contentlen > sizeof(buf) - char_in_buf) {
			num_to_read = sizeof(buf)- char_in_buf;
		} else {
			num_to_read = contentlen;
		}

		if (0 < num_to_read) {
			if (fread(&(buf[char_in_buf]), 1, num_to_read, fin) < num_to_read) {
				ast_log(LOG_WARNING, "fread() failed: %s\n", strerror(errno));
				num_to_read = 0;
			}
			contentlen -= num_to_read;
			char_in_buf += num_to_read;
		}
		/* If I am looking for the filename spec */
		if (find_filename) {
			path_end = filespec = NULL;
			x = strlen("filename=\"");
			marker = find_sequence(buf, char_in_buf, "filename=\"", x );
			if (0 <= marker) {
				marker += x;  /* Index beyond the filename marker */
				path_start = &buf[marker];
				for (path_end = path_start, x = 0; x < char_in_buf-marker; x++, path_end++) {
					if ('\\' == *path_end) {	/* convert backslashses to forward slashes */
						*path_end = '/';
					}
					if ('\"' == *path_end) {	/* If at the end of the file name spec */
						*path_end = '\0';		/* temporarily null terminate the file spec for basename */
						filespec = basename(path_start);
						*path_end = '\"';
						break;
					}
				}
			}
			if (filespec) {	/* If the file name path was found in the header */
				if (fwrite(buf, 1, marker, fout) != marker) {
					ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
				}
				x = (int)(path_end+1 - filespec);
				if (fwrite(filespec, 1, x, fout) != x) {
					ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
				}
				x = (int)(path_end+1 - buf);
				memmove(buf, &(buf[x]), char_in_buf-x);
				char_in_buf -= x;
			}
			find_filename = 0;
		} else { /* I am looking for the boundary marker */
			marker = find_sequence(buf, char_in_buf, boundary, boundary_len);
			if (0 > marker) {
				if (char_in_buf < (boundary_len)) {
					/*no possibility to find the boundary, write all you have */
					if (fwrite(buf, 1, char_in_buf, fout) != char_in_buf) {
						ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
					}
					char_in_buf = 0;
				} else {
					/* write all except for area where the boundary marker could be */
					if (fwrite(buf, 1, char_in_buf -(boundary_len -1), fout) != char_in_buf - (boundary_len - 1)) {
						ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
					}
					x = char_in_buf -(boundary_len -1);
					memmove(buf, &(buf[x]), char_in_buf-x);
					char_in_buf = (boundary_len -1);
				}
			} else {
				/* write up through the boundary, then look for filename in the rest */
				if (fwrite(buf, 1, marker + boundary_len, fout) != marker + boundary_len) {
					ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
				}
				x = marker + boundary_len;
				memmove(buf, &(buf[x]), char_in_buf-x);
				char_in_buf -= marker + boundary_len;
				find_filename =1;
			}
		}
	}
	return 0;
}

static int http_post_callback(struct ast_tcptls_session_instance *ser, const struct ast_http_uri *urih, const char *uri, enum ast_http_method method, struct ast_variable *get_vars, struct ast_variable *headers)
{
	struct ast_variable *var, *cookies;
	unsigned long ident = 0;
	FILE *f;
	int content_len = 0;
	struct ast_str *post_dir;
	GMimeMessage *message;
	int message_count = 0;
	char * boundary_marker = NULL;

	if (method != AST_HTTP_POST) {
		ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
		return -1;
	}

	if (!astman_is_authed(ast_http_manid_from_vars(headers))) {
		ast_http_error(ser, 403, "Access Denied", "Sorry, I cannot let you do that, Dave.");
		return -1;
	}

	if (!urih) {
		ast_http_error(ser, 400, "Missing URI handle", "There was an error parsing the request");
	        return -1;
	}

	cookies = ast_http_get_cookies(headers);
	for (var = cookies; var; var = var->next) {
		if (!strcasecmp(var->name, "mansession_id")) {
			sscanf(var->value, "%30lx", &ident);
			break;
		}
	}
	if (cookies) {
		ast_variables_destroy(cookies);
	}

	if (ident == 0) {
		ast_http_error(ser, 401, "Unauthorized", "You are not authorized to make this request.");
		return -1;
	}
	if (!astman_verify_session_writepermissions(ident, EVENT_FLAG_CONFIG)) {
		ast_http_error(ser, 401, "Unauthorized", "You are not authorized to make this request.");
		return -1;
	}

	if (!(f = tmpfile())) {
		ast_log(LOG_ERROR, "Could not create temp file.\n");
		ast_http_error(ser, 500, "Internal server error", "Could not create temp file.");
		return -1;
	}

	for (var = headers; var; var = var->next) {
		fprintf(f, "%s: %s\r\n", var->name, var->value);

		if (!strcasecmp(var->name, "Content-Length")) {
			if ((sscanf(var->value, "%30u", &content_len)) != 1) {
				ast_log(LOG_ERROR, "Invalid Content-Length in POST request!\n");
				fclose(f);
				ast_http_error(ser, 500, "Internal server error", "Invalid Content-Length in POST request!");
				return -1;
			}
			ast_debug(1, "Got a Content-Length of %d\n", content_len);
		} else if (!strcasecmp(var->name, "Content-Type")) {
			boundary_marker = strstr(var->value, "boundary=");
			if (boundary_marker) {
				boundary_marker += strlen("boundary=");
			}
		}
	}

	fprintf(f, "\r\n");

	if (0 > readmimefile(ser->f, f, boundary_marker, content_len)) {
		ast_debug(1, "Cannot find boundary marker in POST request.\n");
		fclose(f);

		return -1;
	}

	if (fseek(f, SEEK_SET, 0)) {
		ast_log(LOG_ERROR, "Failed to seek temp file back to beginning.\n");
		fclose(f);
		ast_http_error(ser, 500, "Internal server error", "Failed to seek temp file back to beginning.");
		return -1;
	}

	post_dir = urih->data;

	message = parse_message(f); /* Takes ownership and will close f */

	if (!message) {
		ast_log(LOG_ERROR, "Error parsing MIME data\n");

		ast_http_error(ser, 400, "Bad Request", "The was an error parsing the request.");
		return -1;
	}

	if (!(message_count = process_message(message, ast_str_buffer(post_dir)))) {
		ast_log(LOG_ERROR, "Invalid MIME data, found no parts!\n");
		g_object_unref(message);
		ast_http_error(ser, 400, "Bad Request", "The was an error parsing the request.");
		return -1;
	}
	g_object_unref(message);

	ast_http_error(ser, 200, "OK", "File successfully uploaded.");
	return 0;
}

static int __ast_http_post_load(int reload)
{
	struct ast_config *cfg;
	struct ast_variable *v;
	struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };

	cfg = ast_config_load2("http.conf", "http", config_flags);
	if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
		return 0;
	}

	if (reload) {
		ast_http_uri_unlink_all_with_key(__FILE__);
	}

	if (cfg) {
		for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
			if (!strcasecmp(v->name, "prefix")) {
				ast_copy_string(prefix, v->value, sizeof(prefix));
				if (prefix[strlen(prefix)] == '/') {
					prefix[strlen(prefix)] = '\0';
				}
			}
		}

		for (v = ast_variable_browse(cfg, "post_mappings"); v; v = v->next) {
			struct ast_http_uri *urih;
			struct ast_str *ds;

			if (!(urih = ast_calloc(sizeof(*urih), 1))) {
				ast_config_destroy(cfg);
				return -1;
			}

			if (!(ds = ast_str_create(32))) {
				ast_free(urih);
				ast_config_destroy(cfg);
				return -1;
			}

			urih->description = ast_strdup("HTTP POST mapping");
			urih->uri = ast_strdup(v->name);
			ast_str_set(&ds, 0, "%s", v->value);
			urih->data = ds;
			urih->has_subtree = 0;
			urih->callback = http_post_callback;
			urih->key = __FILE__;
			urih->mallocd = urih->dmallocd = 1;

			ast_http_uri_link(urih);
		}

		ast_config_destroy(cfg);
	}
	return 0;
}

static int unload_module(void)
{
	ast_http_uri_unlink_all_with_key(__FILE__);

	return 0;
}

static int reload(void)
{
	__ast_http_post_load(1);

	return AST_MODULE_LOAD_SUCCESS;
}

static int load_module(void)
{
	g_mime_init(0);

	__ast_http_post_load(0);

	return AST_MODULE_LOAD_SUCCESS;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "HTTP POST support",
	.load = load_module,
	.unload = unload_module,
	.reload = reload,
);