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
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
|
/*
Copyright 2015, 2016, 2017 IoT.bzh
author: José Bollo <jose.bollo@iot.bzh>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#define _GNU_SOURCE
#include <limits.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "verbose.h"
#include "wgt.h"
#include "wgt-info.h"
#include "wgt-strings.h"
#include "wgtpkg-files.h"
#include "wgtpkg-workdir.h"
#include "wgtpkg-zip.h"
#include "wgtpkg-permissions.h"
#include "wgtpkg-digsig.h"
#include "wgtpkg-install.h"
#include "secmgr-wrap.h"
#include "utils-dir.h"
#include "wgtpkg-unit.h"
#include "utils-systemd.h"
#include "utils-file.h"
static const char* exec_type_strings[] = {
"application/x-executable",
"application/vnd.agl.native"
};
static const char key_afm_prefix[] = "X-AFM-";
static const char key_http_port[] = "http-port";
/*
* normalize unit files: remove comments, remove heading blanks,
* make single lines
*/
static void normalize_unit_file(char *content)
{
char *read, *write, c;
read = write = content;
c = *read++;
while (c) {
switch (c) {
case '\n':
case ' ':
case '\t':
c = *read++;
break;
case '#':
case ';':
do { c = *read++; } while(c && c != '\n');
break;
default:
*write++ = c;
do { *write++ = c = *read++; } while(c && c != '\n');
if (write - content >= 2 && write[-2] == '\\')
(--write)[-1] = ' ';
break;
}
}
*write = c;
}
static int get_port_cb(void *closure, const char *name, const char *path, int isuser)
{
char *iter;
char *content;
size_t length;
int rc, p;
/* reads the file */
rc = getfile(path, &content, &length);
if (rc < 0)
return rc;
/* normalize the unit file */
normalize_unit_file(content);
/* process the file */
iter = strstr(content, key_afm_prefix);
while (iter) {
iter += sizeof key_afm_prefix - 1;
if (*iter == '-')
iter++;
if (!strncmp(iter, key_http_port, sizeof key_http_port - 1)) {
iter += sizeof key_http_port - 1;
while(*iter && *iter != '=' && *iter != '\n')
iter++;
if (*iter == '=') {
while(*++iter == ' ');
p = atoi(iter);
if (p >= 0 && p < 32768)
((uint32_t*)closure)[p >> 5] |= (uint32_t)1 << (p & 31);
}
}
iter = strstr(iter, key_afm_prefix);
}
free(content);
return 0;
}
static int get_port()
{
int rc;
uint32_t ports[1024]; /* 1024 * 32 = 32768 */
memset(ports, 0, sizeof ports);
rc = systemd_unit_list(0, get_port_cb, &ports);
if (rc >= 0) {
rc = systemd_unit_list(1, get_port_cb, ports);
if (rc >= 0) {
for (rc = 1024 ; rc < 32768 && !~ports[rc >> 5] ; rc += 32);
if (rc == 32768) {
ERROR("Can't compute a valid port");
errno = EADDRNOTAVAIL;
rc = -1;
} else {
while (1 & (ports[rc >> 5] >> (rc & 31))) rc++;
}
}
}
return rc;
}
static int check_defined(const void *data, const char *name)
{
if (data)
return 0;
ERROR("widget has no defined '%s' (temporary constraints)", name);
errno = EINVAL;
return -1;
}
static int check_valid_string(const char *value, const char *name)
{
int pos;
char c;
if (check_defined(value, name))
return -1;
pos = 0;
c = value[pos];
if (c == 0) {
ERROR("empty string forbidden in '%s' (temporary constraints)", name);
errno = EINVAL;
return -1;
}
do {
if (!isalnum(c) && !strchr(".-_", c)) {
ERROR("forbidden char %c in '%s' -> '%s' (temporary constraints)", c, name, value);
errno = EINVAL;
return -1;
}
c = value[++pos];
} while(c);
return 0;
}
static int check_temporary_constraints(const struct wgt_desc *desc)
{
int result;
result = check_valid_string(desc->id, "id");
result |= check_valid_string(desc->version, "version");
result |= check_valid_string(desc->ver, "ver");
result |= check_defined(desc->content_src, "content");
if (desc->icons)
result |= check_defined(desc->icons->src, "icon.src");
if (result)
return result;
if (desc->icons && desc->icons->next) {
ERROR("widget has more than one icon defined (temporary constraints)");
errno = EINVAL;
result = -1;
}
return 0;
}
static int set_required_permissions(struct wgt_desc_param *params, int required)
{
int optional;
while (params) {
/* check if target */
if (!strcmp(params->name, string_sharp_target)) {
/* do nothing when #target */
} else {
/* check the value */
if (!strcmp(params->value, string_required))
optional = !required;
else if (!strcmp(params->value, string_optional))
optional = 1;
else {
ERROR("unexpected parameter value: %s found for %s", params->value, params->name);
errno = EPERM;
return -1;
}
/* set the permission */
if (request_permission(params->name)) {
DEBUG("granted permission: %s", params->name);
} else if (optional) {
INFO("optional permission ungranted: %s", params->name);
} else {
ERROR("ungranted permission required: %s", params->name);
errno = EPERM;
return -1;
}
}
params = params->next;
}
return 0;
}
static int check_permissions(const struct wgt_desc *desc)
{
int result;
const struct wgt_desc_feature *feature;
result = 0;
feature = desc->features;
while(result >= 0 && feature) {
if (!strcmp(feature->name, feature_required_permission))
result = set_required_permissions(feature->params, feature->required);
feature = feature->next;
}
return result;
}
static int for_all_content(const struct wgt_desc *desc, int (*action)(const char *src, const char *type))
{
int rc, rc2;
struct wgt_desc_feature *feat;
const char *src, *type;
rc = action(desc->content_src, desc->content_type);
feat = desc->features;
while (feat) {
if (!strcmp(feat->name, "urn:AGL:widget:provided-unit")) {
src = wgt_info_param(feat, "content.src");
type = wgt_info_param(feat, "content.type");
rc2 = action(src, type);
if (rc >= 0 && rc2 < 0)
rc = rc2;
}
feat = feat->next;
}
return rc;
}
static int set_exec_flag(const char *src, const char *type)
{
int i, rc;
if (src && type) {
i = sizeof exec_type_strings / sizeof *exec_type_strings;
while (i) {
if (!strcasecmp(type, exec_type_strings[--i])) {
rc = fchmodat(workdirfd, src, 0755, 0);
if (rc < 0)
ERROR("can't make executable the file %s", src);
return rc;
}
}
}
return 0;
}
static int check_one_content(const char *src, const char *type)
{
int rc;
struct stat s;
if (!src) {
ERROR("a content src is missing");
errno = EINVAL;
rc = -1;
} else {
/* TODO: when dealing with HTML and languages, the check should
* include i18n path search of widgets */
rc = fstatat(workdirfd, src, &s, AT_NO_AUTOMOUNT|AT_SYMLINK_NOFOLLOW);
if (rc < 0)
ERROR("can't get info on content %s: %m", src);
else if (!S_ISREG(s.st_mode)) {
ERROR("content %s isn't a regular file", src);
errno = EINVAL;
rc = -1;
}
}
return rc;
}
static int check_content(const struct wgt_desc *desc)
{
return for_all_content(desc, check_one_content);
}
static int check_widget(const struct wgt_desc *desc)
{
int result;
result = check_temporary_constraints(desc);
if (result >= 0)
result = check_permissions(desc);
if (result >= 0)
result = check_content(desc);
return result;
}
static int get_target_directory(char target[PATH_MAX], const char *root, const struct wgt_desc *desc)
{
int rc;
rc = snprintf(target, PATH_MAX, "%s/%s/%s", root, desc->id, desc->ver);
if (rc < PATH_MAX)
rc = 0;
else {
ERROR("path too long");
errno = EINVAL;
rc = -1;
}
return rc;
}
static int move_widget_to(const char *destdir, int force)
{
return move_workdir(destdir, 1, force);
}
static int install_icon(const struct wgt_desc *desc)
{
char link[PATH_MAX];
char target[PATH_MAX];
int rc;
if (!desc->icons)
return 0;
create_directory(FWK_ICON_DIR, 0755, 1);
rc = snprintf(link, sizeof link, "%s/%s", FWK_ICON_DIR, desc->idaver);
if (rc >= (int)sizeof link) {
ERROR("link too long in install_icon");
errno = EINVAL;
return -1;
}
rc = snprintf(target, sizeof target, "%s/%s", workdir, desc->icons->src);
if (rc >= (int)sizeof target) {
ERROR("target too long in install_icon");
errno = EINVAL;
return -1;
}
unlink(link);
rc = symlink(target, link);
if (rc)
ERROR("can't create link %s -> %s", link, target);
return rc;
}
static int install_exec_flag(const struct wgt_desc *desc)
{
return for_all_content(desc, set_exec_flag);
}
static int install_file_properties(const struct wgt_desc *desc)
{
int rc, rc2;
struct wgt_desc_feature *feat;
struct wgt_desc_param *param;
rc = 0;
feat = desc->features;
while (feat) {
if (!strcmp(feat->name, "urn:AGL:widget:file-properties")) {
param = feat->params;
while (param) {
if (!strcmp(param->value, "executable")) {
rc2 = fchmodat(workdirfd, param->name, 0755, 0);
if (rc2 < 0)
ERROR("can't make executable the file %s: %m", param->name);
} else {
ERROR("unknown file property %s for %s", param->value, param->name);
errno = EINVAL;
rc2 = -1;
}
if (rc2 < 0 && !rc)
rc = rc2;
param = param->next;
}
}
feat = feat->next;
}
return rc;
}
static int install_security(const struct wgt_desc *desc)
{
char path[PATH_MAX], *head;
const char *icon, *perm;
int rc;
unsigned int i, n, len, lic, lf;
struct filedesc *f;
rc = secmgr_init(desc->id);
if (rc)
goto error;
rc = secmgr_path_public_read_only(workdir);
if (rc)
goto error2;
/* instal the files */
head = stpcpy(path, workdir);
assert(head < path + sizeof path);
len = (unsigned)((path + sizeof path) - head);
if (!len) {
ERROR("root path too long in install_security");
errno = ENAMETOOLONG;
goto error2;
}
len--;
*head++ = '/';
icon = desc->icons ? desc->icons->src : NULL;
lic = (unsigned)strlen(icon);
n = file_count();
i = 0;
while(i < n) {
f = file_of_index(i++);
lf = (unsigned)strlen(f->name);
if (lf >= len) {
ERROR("path too long in install_security");
errno = ENAMETOOLONG;
goto error2;
}
strcpy(head, f->name);
if (lf <= lic && icon && !memcmp(f->name, icon, lf) && (!f->name[lf] || f->name[lf] == '/'))
rc = secmgr_path_public_read_only(path);
else
rc = secmgr_path_read_only(path);
if (rc)
goto error2;
}
/* install the permissions */
perm = first_usable_permission();
while(perm) {
rc = secmgr_permit(perm);
INFO("permitting %s %s", perm, rc ? "FAILED!" : "success");
if (rc)
goto error2;
perm = next_usable_permission();
}
rc = secmgr_install();
return rc;
error2:
secmgr_cancel();
error:
return -1;
}
/* install the widget of the file */
struct wgt_info *install_widget(const char *wgtfile, const char *root, int force)
{
struct wgt_info *ifo;
const struct wgt_desc *desc;
char installdir[PATH_MAX];
int port;
struct unitconf uconf;
NOTICE("-- INSTALLING widget %s to %s --", wgtfile, root);
/* workdir */
create_directory(root, 0755, 1);
if (make_workdir(root, "TMP", 0)) {
ERROR("failed to create a working directory");
goto error1;
}
if (zread(wgtfile, 0))
goto error2;
if (check_all_signatures())
goto error2;
ifo = wgt_info_createat(workdirfd, NULL, 1, 1, 1);
if (!ifo)
goto error2;
reset_requested_permissions();
desc = wgt_info_desc(ifo);
if (check_widget(desc))
goto error3;
if (get_target_directory(installdir, root, desc))
goto error3;
if (move_widget_to(installdir, force))
goto error3;
if (install_icon(desc))
goto error3;
if (install_security(desc))
goto error4;
if (install_exec_flag(desc))
goto error4;
if (install_file_properties(desc))
goto error4;
port = get_port();
if (port < 0)
goto error4;
uconf.installdir = installdir;
uconf.icondir = FWK_ICON_DIR;
uconf.port = port;
if (unit_install(ifo, &uconf))
goto error4;
file_reset();
return ifo;
error4:
/* TODO: cleanup */
error3:
wgt_info_unref(ifo);
error2:
remove_workdir();
error1:
file_reset();
return NULL;
}
|