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12#include "ima_template_lib.h"
13#include <linux/xattr.h>
14#include <linux/evm.h>
15
16static bool ima_template_hash_algo_allowed(u8 algo)
17{
18 if (algo == HASH_ALGO_SHA1 || algo == HASH_ALGO_MD5)
19 return true;
20
21 return false;
22}
23
24enum data_formats {
25 DATA_FMT_DIGEST = 0,
26 DATA_FMT_DIGEST_WITH_ALGO,
27 DATA_FMT_STRING,
28 DATA_FMT_HEX,
29 DATA_FMT_UINT
30};
31
32static int ima_write_template_field_data(const void *data, const u32 datalen,
33 enum data_formats datafmt,
34 struct ima_field_data *field_data)
35{
36 u8 *buf, *buf_ptr;
37 u32 buflen = datalen;
38
39 if (datafmt == DATA_FMT_STRING)
40 buflen = datalen + 1;
41
42 buf = kzalloc(buflen, GFP_KERNEL);
43 if (!buf)
44 return -ENOMEM;
45
46 memcpy(buf, data, datalen);
47
48
49
50
51
52
53
54
55 if (datafmt == DATA_FMT_STRING) {
56 for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++)
57 if (*buf_ptr == ' ')
58 *buf_ptr = '_';
59 }
60
61 field_data->data = buf;
62 field_data->len = buflen;
63 return 0;
64}
65
66static void ima_show_template_data_ascii(struct seq_file *m,
67 enum ima_show_type show,
68 enum data_formats datafmt,
69 struct ima_field_data *field_data)
70{
71 u8 *buf_ptr = field_data->data;
72 u32 buflen = field_data->len;
73
74 switch (datafmt) {
75 case DATA_FMT_DIGEST_WITH_ALGO:
76 buf_ptr = strnchr(field_data->data, buflen, ':');
77 if (buf_ptr != field_data->data)
78 seq_printf(m, "%s", field_data->data);
79
80
81 buf_ptr += 2;
82 buflen -= buf_ptr - field_data->data;
83 fallthrough;
84 case DATA_FMT_DIGEST:
85 case DATA_FMT_HEX:
86 if (!buflen)
87 break;
88 ima_print_digest(m, buf_ptr, buflen);
89 break;
90 case DATA_FMT_STRING:
91 seq_printf(m, "%s", buf_ptr);
92 break;
93 case DATA_FMT_UINT:
94 switch (field_data->len) {
95 case sizeof(u8):
96 seq_printf(m, "%u", *(u8 *)buf_ptr);
97 break;
98 case sizeof(u16):
99 if (ima_canonical_fmt)
100 seq_printf(m, "%u",
101 le16_to_cpu(*(__le16 *)buf_ptr));
102 else
103 seq_printf(m, "%u", *(u16 *)buf_ptr);
104 break;
105 case sizeof(u32):
106 if (ima_canonical_fmt)
107 seq_printf(m, "%u",
108 le32_to_cpu(*(__le32 *)buf_ptr));
109 else
110 seq_printf(m, "%u", *(u32 *)buf_ptr);
111 break;
112 case sizeof(u64):
113 if (ima_canonical_fmt)
114 seq_printf(m, "%llu",
115 le64_to_cpu(*(__le64 *)buf_ptr));
116 else
117 seq_printf(m, "%llu", *(u64 *)buf_ptr);
118 break;
119 default:
120 break;
121 }
122 break;
123 default:
124 break;
125 }
126}
127
128static void ima_show_template_data_binary(struct seq_file *m,
129 enum ima_show_type show,
130 enum data_formats datafmt,
131 struct ima_field_data *field_data)
132{
133 u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ?
134 strlen(field_data->data) : field_data->len;
135
136 if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) {
137 u32 field_len = !ima_canonical_fmt ?
138 len : (__force u32)cpu_to_le32(len);
139
140 ima_putc(m, &field_len, sizeof(field_len));
141 }
142
143 if (!len)
144 return;
145
146 ima_putc(m, field_data->data, len);
147}
148
149static void ima_show_template_field_data(struct seq_file *m,
150 enum ima_show_type show,
151 enum data_formats datafmt,
152 struct ima_field_data *field_data)
153{
154 switch (show) {
155 case IMA_SHOW_ASCII:
156 ima_show_template_data_ascii(m, show, datafmt, field_data);
157 break;
158 case IMA_SHOW_BINARY:
159 case IMA_SHOW_BINARY_NO_FIELD_LEN:
160 case IMA_SHOW_BINARY_OLD_STRING_FMT:
161 ima_show_template_data_binary(m, show, datafmt, field_data);
162 break;
163 default:
164 break;
165 }
166}
167
168void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
169 struct ima_field_data *field_data)
170{
171 ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data);
172}
173
174void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
175 struct ima_field_data *field_data)
176{
177 ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO,
178 field_data);
179}
180
181void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
182 struct ima_field_data *field_data)
183{
184 ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data);
185}
186
187void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
188 struct ima_field_data *field_data)
189{
190 ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
191}
192
193void ima_show_template_buf(struct seq_file *m, enum ima_show_type show,
194 struct ima_field_data *field_data)
195{
196 ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
197}
198
199void ima_show_template_uint(struct seq_file *m, enum ima_show_type show,
200 struct ima_field_data *field_data)
201{
202 ima_show_template_field_data(m, show, DATA_FMT_UINT, field_data);
203}
204
205
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214
215
216
217
218
219int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp,
220 int maxfields, struct ima_field_data *fields, int *curfields,
221 unsigned long *len_mask, int enforce_mask, char *bufname)
222{
223 void *bufp = bufstartp;
224 int i;
225
226 for (i = 0; i < maxfields; i++) {
227 if (len_mask == NULL || !test_bit(i, len_mask)) {
228 if (bufp > (bufendp - sizeof(u32)))
229 break;
230
231 if (ima_canonical_fmt)
232 fields[i].len = le32_to_cpu(*(__le32 *)bufp);
233 else
234 fields[i].len = *(u32 *)bufp;
235
236 bufp += sizeof(u32);
237 }
238
239 if (bufp > (bufendp - fields[i].len))
240 break;
241
242 fields[i].data = bufp;
243 bufp += fields[i].len;
244 }
245
246 if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) {
247 pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n",
248 bufname, maxfields, i);
249 return -EINVAL;
250 }
251
252 if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) {
253 pr_err("%s: buf end mismatch: expected: %p, current: %p\n",
254 bufname, bufendp, bufp);
255 return -EINVAL;
256 }
257
258 if (curfields)
259 *curfields = i;
260
261 if (bufcurp)
262 *bufcurp = bufp;
263
264 return 0;
265}
266
267static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize,
268 u8 hash_algo,
269 struct ima_field_data *field_data)
270{
271
272
273
274
275
276
277
278 u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 };
279 enum data_formats fmt = DATA_FMT_DIGEST;
280 u32 offset = 0;
281
282 if (hash_algo < HASH_ALGO__LAST) {
283 fmt = DATA_FMT_DIGEST_WITH_ALGO;
284 offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
285 hash_algo_name[hash_algo]);
286 buffer[offset] = ':';
287 offset += 2;
288 }
289
290 if (digest)
291 memcpy(buffer + offset, digest, digestsize);
292 else
293
294
295
296
297
298 offset += IMA_DIGEST_SIZE;
299
300 return ima_write_template_field_data(buffer, offset + digestsize,
301 fmt, field_data);
302}
303
304
305
306
307int ima_eventdigest_init(struct ima_event_data *event_data,
308 struct ima_field_data *field_data)
309{
310 struct {
311 struct ima_digest_data hdr;
312 char digest[IMA_MAX_DIGEST_SIZE];
313 } hash;
314 u8 *cur_digest = NULL;
315 u32 cur_digestsize = 0;
316 struct inode *inode;
317 int result;
318
319 memset(&hash, 0, sizeof(hash));
320
321 if (event_data->violation)
322 goto out;
323
324 if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
325 cur_digest = event_data->iint->ima_hash->digest;
326 cur_digestsize = event_data->iint->ima_hash->length;
327 goto out;
328 }
329
330 if ((const char *)event_data->filename == boot_aggregate_name) {
331 if (ima_tpm_chip) {
332 hash.hdr.algo = HASH_ALGO_SHA1;
333 result = ima_calc_boot_aggregate(&hash.hdr);
334
335
336 if (!result && hash.hdr.algo != HASH_ALGO_SHA1)
337 result = -EINVAL;
338
339 if (result < 0)
340 memset(&hash, 0, sizeof(hash));
341 }
342
343 cur_digest = hash.hdr.digest;
344 cur_digestsize = hash_digest_size[HASH_ALGO_SHA1];
345 goto out;
346 }
347
348 if (!event_data->file)
349 return -EINVAL;
350
351 inode = file_inode(event_data->file);
352 hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
353 ima_hash_algo : HASH_ALGO_SHA1;
354 result = ima_calc_file_hash(event_data->file, &hash.hdr);
355 if (result) {
356 integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
357 event_data->filename, "collect_data",
358 "failed", result, 0);
359 return result;
360 }
361 cur_digest = hash.hdr.digest;
362 cur_digestsize = hash.hdr.length;
363out:
364 return ima_eventdigest_init_common(cur_digest, cur_digestsize,
365 HASH_ALGO__LAST, field_data);
366}
367
368
369
370
371int ima_eventdigest_ng_init(struct ima_event_data *event_data,
372 struct ima_field_data *field_data)
373{
374 u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
375 u32 cur_digestsize = 0;
376
377 if (event_data->violation)
378 goto out;
379
380 cur_digest = event_data->iint->ima_hash->digest;
381 cur_digestsize = event_data->iint->ima_hash->length;
382
383 hash_algo = event_data->iint->ima_hash->algo;
384out:
385 return ima_eventdigest_init_common(cur_digest, cur_digestsize,
386 hash_algo, field_data);
387}
388
389
390
391
392
393int ima_eventdigest_modsig_init(struct ima_event_data *event_data,
394 struct ima_field_data *field_data)
395{
396 enum hash_algo hash_algo;
397 const u8 *cur_digest;
398 u32 cur_digestsize;
399
400 if (!event_data->modsig)
401 return 0;
402
403 if (event_data->violation) {
404
405 hash_algo = HASH_ALGO_SHA1;
406 cur_digest = NULL;
407 cur_digestsize = 0;
408 } else {
409 int rc;
410
411 rc = ima_get_modsig_digest(event_data->modsig, &hash_algo,
412 &cur_digest, &cur_digestsize);
413 if (rc)
414 return rc;
415 else if (hash_algo == HASH_ALGO__LAST || cur_digestsize == 0)
416
417 return -EINVAL;
418 }
419
420 return ima_eventdigest_init_common(cur_digest, cur_digestsize,
421 hash_algo, field_data);
422}
423
424static int ima_eventname_init_common(struct ima_event_data *event_data,
425 struct ima_field_data *field_data,
426 bool size_limit)
427{
428 const char *cur_filename = NULL;
429 u32 cur_filename_len = 0;
430
431 BUG_ON(event_data->filename == NULL && event_data->file == NULL);
432
433 if (event_data->filename) {
434 cur_filename = event_data->filename;
435 cur_filename_len = strlen(event_data->filename);
436
437 if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
438 goto out;
439 }
440
441 if (event_data->file) {
442 cur_filename = event_data->file->f_path.dentry->d_name.name;
443 cur_filename_len = strlen(cur_filename);
444 } else
445
446
447
448
449 cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
450out:
451 return ima_write_template_field_data(cur_filename, cur_filename_len,
452 DATA_FMT_STRING, field_data);
453}
454
455
456
457
458int ima_eventname_init(struct ima_event_data *event_data,
459 struct ima_field_data *field_data)
460{
461 return ima_eventname_init_common(event_data, field_data, true);
462}
463
464
465
466
467int ima_eventname_ng_init(struct ima_event_data *event_data,
468 struct ima_field_data *field_data)
469{
470 return ima_eventname_init_common(event_data, field_data, false);
471}
472
473
474
475
476int ima_eventsig_init(struct ima_event_data *event_data,
477 struct ima_field_data *field_data)
478{
479 struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;
480
481 if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG))
482 return ima_eventevmsig_init(event_data, field_data);
483
484 return ima_write_template_field_data(xattr_value, event_data->xattr_len,
485 DATA_FMT_HEX, field_data);
486}
487
488
489
490
491
492int ima_eventbuf_init(struct ima_event_data *event_data,
493 struct ima_field_data *field_data)
494{
495 if ((!event_data->buf) || (event_data->buf_len == 0))
496 return 0;
497
498 return ima_write_template_field_data(event_data->buf,
499 event_data->buf_len, DATA_FMT_HEX,
500 field_data);
501}
502
503
504
505
506
507int ima_eventmodsig_init(struct ima_event_data *event_data,
508 struct ima_field_data *field_data)
509{
510 const void *data;
511 u32 data_len;
512 int rc;
513
514 if (!event_data->modsig)
515 return 0;
516
517
518
519
520
521 rc = ima_get_raw_modsig(event_data->modsig, &data, &data_len);
522 if (rc)
523 return rc;
524
525 return ima_write_template_field_data(data, data_len, DATA_FMT_HEX,
526 field_data);
527}
528
529
530
531
532
533int ima_eventevmsig_init(struct ima_event_data *event_data,
534 struct ima_field_data *field_data)
535{
536 struct evm_ima_xattr_data *xattr_data = NULL;
537 int rc = 0;
538
539 if (!event_data->file)
540 return 0;
541
542 rc = vfs_getxattr_alloc(&init_user_ns, file_dentry(event_data->file),
543 XATTR_NAME_EVM, (char **)&xattr_data, 0,
544 GFP_NOFS);
545 if (rc <= 0)
546 return 0;
547
548 if (xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG) {
549 kfree(xattr_data);
550 return 0;
551 }
552
553 rc = ima_write_template_field_data((char *)xattr_data, rc, DATA_FMT_HEX,
554 field_data);
555 kfree(xattr_data);
556 return rc;
557}
558
559static int ima_eventinodedac_init_common(struct ima_event_data *event_data,
560 struct ima_field_data *field_data,
561 bool get_uid)
562{
563 unsigned int id;
564
565 if (!event_data->file)
566 return 0;
567
568 if (get_uid)
569 id = i_uid_read(file_inode(event_data->file));
570 else
571 id = i_gid_read(file_inode(event_data->file));
572
573 if (ima_canonical_fmt) {
574 if (sizeof(id) == sizeof(u16))
575 id = (__force u16)cpu_to_le16(id);
576 else
577 id = (__force u32)cpu_to_le32(id);
578 }
579
580 return ima_write_template_field_data((void *)&id, sizeof(id),
581 DATA_FMT_UINT, field_data);
582}
583
584
585
586
587
588int ima_eventinodeuid_init(struct ima_event_data *event_data,
589 struct ima_field_data *field_data)
590{
591 return ima_eventinodedac_init_common(event_data, field_data, true);
592}
593
594
595
596
597
598int ima_eventinodegid_init(struct ima_event_data *event_data,
599 struct ima_field_data *field_data)
600{
601 return ima_eventinodedac_init_common(event_data, field_data, false);
602}
603
604
605
606
607
608int ima_eventinodemode_init(struct ima_event_data *event_data,
609 struct ima_field_data *field_data)
610{
611 struct inode *inode;
612 u16 mode;
613
614 if (!event_data->file)
615 return 0;
616
617 inode = file_inode(event_data->file);
618 mode = inode->i_mode;
619 if (ima_canonical_fmt)
620 mode = (__force u16)cpu_to_le16(mode);
621
622 return ima_write_template_field_data((char *)&mode, sizeof(mode),
623 DATA_FMT_UINT, field_data);
624}
625
626static int ima_eventinodexattrs_init_common(struct ima_event_data *event_data,
627 struct ima_field_data *field_data,
628 char type)
629{
630 u8 *buffer = NULL;
631 int rc;
632
633 if (!event_data->file)
634 return 0;
635
636 rc = evm_read_protected_xattrs(file_dentry(event_data->file), NULL, 0,
637 type, ima_canonical_fmt);
638 if (rc < 0)
639 return 0;
640
641 buffer = kmalloc(rc, GFP_KERNEL);
642 if (!buffer)
643 return 0;
644
645 rc = evm_read_protected_xattrs(file_dentry(event_data->file), buffer,
646 rc, type, ima_canonical_fmt);
647 if (rc < 0) {
648 rc = 0;
649 goto out;
650 }
651
652 rc = ima_write_template_field_data((char *)buffer, rc, DATA_FMT_HEX,
653 field_data);
654out:
655 kfree(buffer);
656 return rc;
657}
658
659
660
661
662
663int ima_eventinodexattrnames_init(struct ima_event_data *event_data,
664 struct ima_field_data *field_data)
665{
666 return ima_eventinodexattrs_init_common(event_data, field_data, 'n');
667}
668
669
670
671
672
673int ima_eventinodexattrlengths_init(struct ima_event_data *event_data,
674 struct ima_field_data *field_data)
675{
676 return ima_eventinodexattrs_init_common(event_data, field_data, 'l');
677}
678
679
680
681
682
683int ima_eventinodexattrvalues_init(struct ima_event_data *event_data,
684 struct ima_field_data *field_data)
685{
686 return ima_eventinodexattrs_init_common(event_data, field_data, 'v');
687}
688