Commit | Line | Data |
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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3ce1217d RS |
2 | /* |
3 | * Copyright (C) 2013 Politecnico di Torino, Italy | |
c9fecf50 | 4 | * TORSEC group -- https://security.polito.it |
3ce1217d RS |
5 | * |
6 | * Author: Roberto Sassu <roberto.sassu@polito.it> | |
7 | * | |
3ce1217d RS |
8 | * File: ima_template_lib.c |
9 | * Library of supported template fields. | |
10 | */ | |
4d7aeee7 | 11 | |
3ce1217d | 12 | #include "ima_template_lib.h" |
026d7fc9 | 13 | #include <linux/xattr.h> |
3ce1217d | 14 | |
4d7aeee7 RS |
15 | static bool ima_template_hash_algo_allowed(u8 algo) |
16 | { | |
17 | if (algo == HASH_ALGO_SHA1 || algo == HASH_ALGO_MD5) | |
18 | return true; | |
19 | ||
20 | return false; | |
21 | } | |
22 | ||
23 | enum data_formats { | |
24 | DATA_FMT_DIGEST = 0, | |
25 | DATA_FMT_DIGEST_WITH_ALGO, | |
bcbc9b0c | 26 | DATA_FMT_STRING, |
cde1391a RS |
27 | DATA_FMT_HEX, |
28 | DATA_FMT_UINT | |
4d7aeee7 RS |
29 | }; |
30 | ||
3ce1217d RS |
31 | static int ima_write_template_field_data(const void *data, const u32 datalen, |
32 | enum data_formats datafmt, | |
33 | struct ima_field_data *field_data) | |
34 | { | |
35 | u8 *buf, *buf_ptr; | |
e3b64c26 | 36 | u32 buflen = datalen; |
3ce1217d | 37 | |
e3b64c26 | 38 | if (datafmt == DATA_FMT_STRING) |
3ce1217d | 39 | buflen = datalen + 1; |
3ce1217d RS |
40 | |
41 | buf = kzalloc(buflen, GFP_KERNEL); | |
42 | if (!buf) | |
43 | return -ENOMEM; | |
44 | ||
45 | memcpy(buf, data, datalen); | |
46 | ||
47 | /* | |
48 | * Replace all space characters with underscore for event names and | |
49 | * strings. This avoid that, during the parsing of a measurements list, | |
50 | * filenames with spaces or that end with the suffix ' (deleted)' are | |
51 | * split into multiple template fields (the space is the delimitator | |
52 | * character for measurements lists in ASCII format). | |
53 | */ | |
e3b64c26 | 54 | if (datafmt == DATA_FMT_STRING) { |
3ce1217d RS |
55 | for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++) |
56 | if (*buf_ptr == ' ') | |
57 | *buf_ptr = '_'; | |
58 | } | |
59 | ||
60 | field_data->data = buf; | |
61 | field_data->len = buflen; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void ima_show_template_data_ascii(struct seq_file *m, | |
66 | enum ima_show_type show, | |
67 | enum data_formats datafmt, | |
68 | struct ima_field_data *field_data) | |
69 | { | |
45b26133 MZ |
70 | u8 *buf_ptr = field_data->data; |
71 | u32 buflen = field_data->len; | |
4d7aeee7 | 72 | |
3ce1217d | 73 | switch (datafmt) { |
4d7aeee7 RS |
74 | case DATA_FMT_DIGEST_WITH_ALGO: |
75 | buf_ptr = strnchr(field_data->data, buflen, ':'); | |
76 | if (buf_ptr != field_data->data) | |
77 | seq_printf(m, "%s", field_data->data); | |
78 | ||
79 | /* skip ':' and '\0' */ | |
80 | buf_ptr += 2; | |
81 | buflen -= buf_ptr - field_data->data; | |
df561f66 | 82 | fallthrough; |
3ce1217d | 83 | case DATA_FMT_DIGEST: |
bcbc9b0c MZ |
84 | case DATA_FMT_HEX: |
85 | if (!buflen) | |
86 | break; | |
4d7aeee7 | 87 | ima_print_digest(m, buf_ptr, buflen); |
3ce1217d RS |
88 | break; |
89 | case DATA_FMT_STRING: | |
4d7aeee7 | 90 | seq_printf(m, "%s", buf_ptr); |
3ce1217d | 91 | break; |
cde1391a RS |
92 | case DATA_FMT_UINT: |
93 | switch (field_data->len) { | |
94 | case sizeof(u8): | |
95 | seq_printf(m, "%u", *(u8 *)buf_ptr); | |
96 | break; | |
97 | case sizeof(u16): | |
98 | if (ima_canonical_fmt) | |
99 | seq_printf(m, "%u", | |
100 | le16_to_cpu(*(u16 *)buf_ptr)); | |
101 | else | |
102 | seq_printf(m, "%u", *(u16 *)buf_ptr); | |
103 | break; | |
104 | case sizeof(u32): | |
105 | if (ima_canonical_fmt) | |
106 | seq_printf(m, "%u", | |
107 | le32_to_cpu(*(u32 *)buf_ptr)); | |
108 | else | |
109 | seq_printf(m, "%u", *(u32 *)buf_ptr); | |
110 | break; | |
111 | case sizeof(u64): | |
112 | if (ima_canonical_fmt) | |
113 | seq_printf(m, "%llu", | |
114 | le64_to_cpu(*(u64 *)buf_ptr)); | |
115 | else | |
116 | seq_printf(m, "%llu", *(u64 *)buf_ptr); | |
117 | break; | |
118 | default: | |
119 | break; | |
120 | } | |
3ce1217d RS |
121 | default: |
122 | break; | |
123 | } | |
124 | } | |
125 | ||
126 | static void ima_show_template_data_binary(struct seq_file *m, | |
127 | enum ima_show_type show, | |
128 | enum data_formats datafmt, | |
129 | struct ima_field_data *field_data) | |
130 | { | |
c019e307 RS |
131 | u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ? |
132 | strlen(field_data->data) : field_data->len; | |
133 | ||
d68a6fe9 MZ |
134 | if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) { |
135 | u32 field_len = !ima_canonical_fmt ? len : cpu_to_le32(len); | |
136 | ||
137 | ima_putc(m, &field_len, sizeof(field_len)); | |
138 | } | |
3e8e5503 | 139 | |
c019e307 | 140 | if (!len) |
3ce1217d | 141 | return; |
3e8e5503 | 142 | |
c019e307 | 143 | ima_putc(m, field_data->data, len); |
3ce1217d RS |
144 | } |
145 | ||
146 | static void ima_show_template_field_data(struct seq_file *m, | |
147 | enum ima_show_type show, | |
148 | enum data_formats datafmt, | |
149 | struct ima_field_data *field_data) | |
150 | { | |
151 | switch (show) { | |
152 | case IMA_SHOW_ASCII: | |
153 | ima_show_template_data_ascii(m, show, datafmt, field_data); | |
154 | break; | |
155 | case IMA_SHOW_BINARY: | |
3e8e5503 | 156 | case IMA_SHOW_BINARY_NO_FIELD_LEN: |
c019e307 | 157 | case IMA_SHOW_BINARY_OLD_STRING_FMT: |
3ce1217d RS |
158 | ima_show_template_data_binary(m, show, datafmt, field_data); |
159 | break; | |
160 | default: | |
161 | break; | |
162 | } | |
163 | } | |
164 | ||
165 | void ima_show_template_digest(struct seq_file *m, enum ima_show_type show, | |
166 | struct ima_field_data *field_data) | |
167 | { | |
168 | ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data); | |
169 | } | |
170 | ||
4d7aeee7 RS |
171 | void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show, |
172 | struct ima_field_data *field_data) | |
173 | { | |
174 | ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO, | |
175 | field_data); | |
176 | } | |
177 | ||
3ce1217d RS |
178 | void ima_show_template_string(struct seq_file *m, enum ima_show_type show, |
179 | struct ima_field_data *field_data) | |
180 | { | |
181 | ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data); | |
182 | } | |
183 | ||
bcbc9b0c MZ |
184 | void ima_show_template_sig(struct seq_file *m, enum ima_show_type show, |
185 | struct ima_field_data *field_data) | |
186 | { | |
187 | ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data); | |
188 | } | |
189 | ||
86b4da8c PS |
190 | void ima_show_template_buf(struct seq_file *m, enum ima_show_type show, |
191 | struct ima_field_data *field_data) | |
192 | { | |
193 | ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data); | |
194 | } | |
195 | ||
cde1391a RS |
196 | void ima_show_template_uint(struct seq_file *m, enum ima_show_type show, |
197 | struct ima_field_data *field_data) | |
198 | { | |
199 | ima_show_template_field_data(m, show, DATA_FMT_UINT, field_data); | |
200 | } | |
201 | ||
b17fd9ec RS |
202 | /** |
203 | * ima_parse_buf() - Parses lengths and data from an input buffer | |
204 | * @bufstartp: Buffer start address. | |
205 | * @bufendp: Buffer end address. | |
206 | * @bufcurp: Pointer to remaining (non-parsed) data. | |
207 | * @maxfields: Length of fields array. | |
208 | * @fields: Array containing lengths and pointers of parsed data. | |
209 | * @curfields: Number of array items containing parsed data. | |
210 | * @len_mask: Bitmap (if bit is set, data length should not be parsed). | |
211 | * @enforce_mask: Check if curfields == maxfields and/or bufcurp == bufendp. | |
212 | * @bufname: String identifier of the input buffer. | |
213 | * | |
214 | * Return: 0 on success, -EINVAL on error. | |
215 | */ | |
216 | int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp, | |
217 | int maxfields, struct ima_field_data *fields, int *curfields, | |
218 | unsigned long *len_mask, int enforce_mask, char *bufname) | |
219 | { | |
220 | void *bufp = bufstartp; | |
221 | int i; | |
222 | ||
223 | for (i = 0; i < maxfields; i++) { | |
224 | if (len_mask == NULL || !test_bit(i, len_mask)) { | |
225 | if (bufp > (bufendp - sizeof(u32))) | |
226 | break; | |
227 | ||
228 | fields[i].len = *(u32 *)bufp; | |
229 | if (ima_canonical_fmt) | |
230 | fields[i].len = le32_to_cpu(fields[i].len); | |
231 | ||
232 | bufp += sizeof(u32); | |
233 | } | |
234 | ||
235 | if (bufp > (bufendp - fields[i].len)) | |
236 | break; | |
237 | ||
238 | fields[i].data = bufp; | |
239 | bufp += fields[i].len; | |
240 | } | |
241 | ||
242 | if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) { | |
243 | pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n", | |
244 | bufname, maxfields, i); | |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) { | |
249 | pr_err("%s: buf end mismatch: expected: %p, current: %p\n", | |
250 | bufname, bufendp, bufp); | |
251 | return -EINVAL; | |
252 | } | |
253 | ||
254 | if (curfields) | |
255 | *curfields = i; | |
256 | ||
257 | if (bufcurp) | |
258 | *bufcurp = bufp; | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
3878d505 TJB |
263 | static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize, |
264 | u8 hash_algo, | |
dcf4e392 | 265 | struct ima_field_data *field_data) |
4d7aeee7 RS |
266 | { |
267 | /* | |
268 | * digest formats: | |
269 | * - DATA_FMT_DIGEST: digest | |
270 | * - DATA_FMT_DIGEST_WITH_ALGO: [<hash algo>] + ':' + '\0' + digest, | |
271 | * where <hash algo> is provided if the hash algoritm is not | |
272 | * SHA1 or MD5 | |
273 | */ | |
274 | u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 }; | |
275 | enum data_formats fmt = DATA_FMT_DIGEST; | |
276 | u32 offset = 0; | |
277 | ||
dcf4e392 | 278 | if (hash_algo < HASH_ALGO__LAST) { |
4d7aeee7 | 279 | fmt = DATA_FMT_DIGEST_WITH_ALGO; |
dcf4e392 RS |
280 | offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s", |
281 | hash_algo_name[hash_algo]); | |
4d7aeee7 RS |
282 | buffer[offset] = ':'; |
283 | offset += 2; | |
284 | } | |
285 | ||
286 | if (digest) | |
287 | memcpy(buffer + offset, digest, digestsize); | |
288 | else | |
289 | /* | |
290 | * If digest is NULL, the event being recorded is a violation. | |
291 | * Make room for the digest by increasing the offset of | |
292 | * IMA_DIGEST_SIZE. | |
293 | */ | |
294 | offset += IMA_DIGEST_SIZE; | |
295 | ||
296 | return ima_write_template_field_data(buffer, offset + digestsize, | |
297 | fmt, field_data); | |
298 | } | |
299 | ||
3ce1217d | 300 | /* |
4d7aeee7 | 301 | * This function writes the digest of an event (with size limit). |
3ce1217d | 302 | */ |
23b57419 | 303 | int ima_eventdigest_init(struct ima_event_data *event_data, |
3ce1217d RS |
304 | struct ima_field_data *field_data) |
305 | { | |
306 | struct { | |
307 | struct ima_digest_data hdr; | |
308 | char digest[IMA_MAX_DIGEST_SIZE]; | |
309 | } hash; | |
4d7aeee7 RS |
310 | u8 *cur_digest = NULL; |
311 | u32 cur_digestsize = 0; | |
3ce1217d RS |
312 | struct inode *inode; |
313 | int result; | |
314 | ||
315 | memset(&hash, 0, sizeof(hash)); | |
316 | ||
8d94eb9b | 317 | if (event_data->violation) /* recording a violation. */ |
3ce1217d RS |
318 | goto out; |
319 | ||
23b57419 RS |
320 | if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) { |
321 | cur_digest = event_data->iint->ima_hash->digest; | |
322 | cur_digestsize = event_data->iint->ima_hash->length; | |
3ce1217d RS |
323 | goto out; |
324 | } | |
325 | ||
6cc7c266 RS |
326 | if ((const char *)event_data->filename == boot_aggregate_name) { |
327 | if (ima_tpm_chip) { | |
328 | hash.hdr.algo = HASH_ALGO_SHA1; | |
329 | result = ima_calc_boot_aggregate(&hash.hdr); | |
330 | ||
331 | /* algo can change depending on available PCR banks */ | |
332 | if (!result && hash.hdr.algo != HASH_ALGO_SHA1) | |
333 | result = -EINVAL; | |
334 | ||
335 | if (result < 0) | |
336 | memset(&hash, 0, sizeof(hash)); | |
337 | } | |
338 | ||
339 | cur_digest = hash.hdr.digest; | |
340 | cur_digestsize = hash_digest_size[HASH_ALGO_SHA1]; | |
341 | goto out; | |
342 | } | |
343 | ||
23b57419 | 344 | if (!event_data->file) /* missing info to re-calculate the digest */ |
3ce1217d RS |
345 | return -EINVAL; |
346 | ||
23b57419 | 347 | inode = file_inode(event_data->file); |
4d7aeee7 RS |
348 | hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ? |
349 | ima_hash_algo : HASH_ALGO_SHA1; | |
23b57419 | 350 | result = ima_calc_file_hash(event_data->file, &hash.hdr); |
3ce1217d RS |
351 | if (result) { |
352 | integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, | |
23b57419 | 353 | event_data->filename, "collect_data", |
3ce1217d RS |
354 | "failed", result, 0); |
355 | return result; | |
356 | } | |
4d7aeee7 RS |
357 | cur_digest = hash.hdr.digest; |
358 | cur_digestsize = hash.hdr.length; | |
3ce1217d | 359 | out: |
712a49bd | 360 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, |
dcf4e392 | 361 | HASH_ALGO__LAST, field_data); |
3ce1217d RS |
362 | } |
363 | ||
364 | /* | |
4d7aeee7 | 365 | * This function writes the digest of an event (without size limit). |
3ce1217d | 366 | */ |
23b57419 RS |
367 | int ima_eventdigest_ng_init(struct ima_event_data *event_data, |
368 | struct ima_field_data *field_data) | |
4d7aeee7 | 369 | { |
c502c78b | 370 | u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1; |
4d7aeee7 RS |
371 | u32 cur_digestsize = 0; |
372 | ||
8d94eb9b | 373 | if (event_data->violation) /* recording a violation. */ |
4d7aeee7 RS |
374 | goto out; |
375 | ||
23b57419 RS |
376 | cur_digest = event_data->iint->ima_hash->digest; |
377 | cur_digestsize = event_data->iint->ima_hash->length; | |
4d7aeee7 | 378 | |
23b57419 | 379 | hash_algo = event_data->iint->ima_hash->algo; |
4d7aeee7 RS |
380 | out: |
381 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
dcf4e392 | 382 | hash_algo, field_data); |
4d7aeee7 RS |
383 | } |
384 | ||
3878d505 TJB |
385 | /* |
386 | * This function writes the digest of the file which is expected to match the | |
387 | * digest contained in the file's appended signature. | |
388 | */ | |
389 | int ima_eventdigest_modsig_init(struct ima_event_data *event_data, | |
390 | struct ima_field_data *field_data) | |
391 | { | |
392 | enum hash_algo hash_algo; | |
393 | const u8 *cur_digest; | |
394 | u32 cur_digestsize; | |
395 | ||
396 | if (!event_data->modsig) | |
397 | return 0; | |
398 | ||
399 | if (event_data->violation) { | |
400 | /* Recording a violation. */ | |
401 | hash_algo = HASH_ALGO_SHA1; | |
402 | cur_digest = NULL; | |
403 | cur_digestsize = 0; | |
404 | } else { | |
405 | int rc; | |
406 | ||
407 | rc = ima_get_modsig_digest(event_data->modsig, &hash_algo, | |
408 | &cur_digest, &cur_digestsize); | |
409 | if (rc) | |
410 | return rc; | |
411 | else if (hash_algo == HASH_ALGO__LAST || cur_digestsize == 0) | |
412 | /* There was some error collecting the digest. */ | |
413 | return -EINVAL; | |
414 | } | |
415 | ||
416 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
417 | hash_algo, field_data); | |
418 | } | |
419 | ||
23b57419 | 420 | static int ima_eventname_init_common(struct ima_event_data *event_data, |
4d7aeee7 RS |
421 | struct ima_field_data *field_data, |
422 | bool size_limit) | |
3ce1217d RS |
423 | { |
424 | const char *cur_filename = NULL; | |
425 | u32 cur_filename_len = 0; | |
426 | ||
23b57419 | 427 | BUG_ON(event_data->filename == NULL && event_data->file == NULL); |
3ce1217d | 428 | |
23b57419 RS |
429 | if (event_data->filename) { |
430 | cur_filename = event_data->filename; | |
431 | cur_filename_len = strlen(event_data->filename); | |
3ce1217d | 432 | |
4d7aeee7 | 433 | if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX) |
3ce1217d RS |
434 | goto out; |
435 | } | |
436 | ||
23b57419 RS |
437 | if (event_data->file) { |
438 | cur_filename = event_data->file->f_path.dentry->d_name.name; | |
3ce1217d RS |
439 | cur_filename_len = strlen(cur_filename); |
440 | } else | |
441 | /* | |
442 | * Truncate filename if the latter is too long and | |
443 | * the file descriptor is not available. | |
444 | */ | |
445 | cur_filename_len = IMA_EVENT_NAME_LEN_MAX; | |
446 | out: | |
447 | return ima_write_template_field_data(cur_filename, cur_filename_len, | |
e3b64c26 | 448 | DATA_FMT_STRING, field_data); |
4d7aeee7 RS |
449 | } |
450 | ||
451 | /* | |
452 | * This function writes the name of an event (with size limit). | |
453 | */ | |
23b57419 | 454 | int ima_eventname_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
455 | struct ima_field_data *field_data) |
456 | { | |
23b57419 | 457 | return ima_eventname_init_common(event_data, field_data, true); |
4d7aeee7 RS |
458 | } |
459 | ||
460 | /* | |
461 | * This function writes the name of an event (without size limit). | |
462 | */ | |
23b57419 | 463 | int ima_eventname_ng_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
464 | struct ima_field_data *field_data) |
465 | { | |
23b57419 | 466 | return ima_eventname_init_common(event_data, field_data, false); |
3ce1217d | 467 | } |
bcbc9b0c MZ |
468 | |
469 | /* | |
470 | * ima_eventsig_init - include the file signature as part of the template data | |
471 | */ | |
23b57419 | 472 | int ima_eventsig_init(struct ima_event_data *event_data, |
bcbc9b0c MZ |
473 | struct ima_field_data *field_data) |
474 | { | |
23b57419 | 475 | struct evm_ima_xattr_data *xattr_value = event_data->xattr_value; |
bcbc9b0c MZ |
476 | |
477 | if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG)) | |
026d7fc9 | 478 | return ima_eventevmsig_init(event_data, field_data); |
bcbc9b0c | 479 | |
1775cb87 TJB |
480 | return ima_write_template_field_data(xattr_value, event_data->xattr_len, |
481 | DATA_FMT_HEX, field_data); | |
bcbc9b0c | 482 | } |
86b4da8c PS |
483 | |
484 | /* | |
485 | * ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the | |
486 | * template data. | |
487 | */ | |
488 | int ima_eventbuf_init(struct ima_event_data *event_data, | |
489 | struct ima_field_data *field_data) | |
490 | { | |
491 | if ((!event_data->buf) || (event_data->buf_len == 0)) | |
492 | return 0; | |
493 | ||
494 | return ima_write_template_field_data(event_data->buf, | |
495 | event_data->buf_len, DATA_FMT_HEX, | |
496 | field_data); | |
497 | } | |
3878d505 TJB |
498 | |
499 | /* | |
500 | * ima_eventmodsig_init - include the appended file signature as part of the | |
501 | * template data | |
502 | */ | |
503 | int ima_eventmodsig_init(struct ima_event_data *event_data, | |
504 | struct ima_field_data *field_data) | |
505 | { | |
506 | const void *data; | |
507 | u32 data_len; | |
508 | int rc; | |
509 | ||
510 | if (!event_data->modsig) | |
511 | return 0; | |
512 | ||
513 | /* | |
514 | * modsig is a runtime structure containing pointers. Get its raw data | |
515 | * instead. | |
516 | */ | |
517 | rc = ima_get_raw_modsig(event_data->modsig, &data, &data_len); | |
518 | if (rc) | |
519 | return rc; | |
520 | ||
521 | return ima_write_template_field_data(data, data_len, DATA_FMT_HEX, | |
522 | field_data); | |
523 | } | |
026d7fc9 RS |
524 | |
525 | /* | |
526 | * ima_eventevmsig_init - include the EVM portable signature as part of the | |
527 | * template data | |
528 | */ | |
529 | int ima_eventevmsig_init(struct ima_event_data *event_data, | |
530 | struct ima_field_data *field_data) | |
531 | { | |
532 | struct evm_ima_xattr_data *xattr_data = NULL; | |
533 | int rc = 0; | |
534 | ||
535 | if (!event_data->file) | |
536 | return 0; | |
537 | ||
538 | rc = vfs_getxattr_alloc(&init_user_ns, file_dentry(event_data->file), | |
539 | XATTR_NAME_EVM, (char **)&xattr_data, 0, | |
540 | GFP_NOFS); | |
541 | if (rc <= 0) | |
542 | return 0; | |
543 | ||
544 | if (xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG) { | |
545 | kfree(xattr_data); | |
546 | return 0; | |
547 | } | |
548 | ||
549 | rc = ima_write_template_field_data((char *)xattr_data, rc, DATA_FMT_HEX, | |
550 | field_data); | |
551 | kfree(xattr_data); | |
552 | return rc; | |
553 | } | |
7dcfeacc RS |
554 | |
555 | static int ima_eventinodedac_init_common(struct ima_event_data *event_data, | |
556 | struct ima_field_data *field_data, | |
557 | bool get_uid) | |
558 | { | |
559 | unsigned int id; | |
560 | ||
561 | if (!event_data->file) | |
562 | return 0; | |
563 | ||
564 | if (get_uid) | |
565 | id = i_uid_read(file_inode(event_data->file)); | |
566 | else | |
567 | id = i_gid_read(file_inode(event_data->file)); | |
568 | ||
569 | if (ima_canonical_fmt) { | |
570 | if (sizeof(id) == sizeof(u16)) | |
571 | id = cpu_to_le16(id); | |
572 | else | |
573 | id = cpu_to_le32(id); | |
574 | } | |
575 | ||
576 | return ima_write_template_field_data((void *)&id, sizeof(id), | |
577 | DATA_FMT_UINT, field_data); | |
578 | } | |
579 | ||
580 | /* | |
581 | * ima_eventinodeuid_init - include the inode UID as part of the template | |
582 | * data | |
583 | */ | |
584 | int ima_eventinodeuid_init(struct ima_event_data *event_data, | |
585 | struct ima_field_data *field_data) | |
586 | { | |
587 | return ima_eventinodedac_init_common(event_data, field_data, true); | |
588 | } | |
589 | ||
590 | /* | |
591 | * ima_eventinodegid_init - include the inode GID as part of the template | |
592 | * data | |
593 | */ | |
594 | int ima_eventinodegid_init(struct ima_event_data *event_data, | |
595 | struct ima_field_data *field_data) | |
596 | { | |
597 | return ima_eventinodedac_init_common(event_data, field_data, false); | |
598 | } | |
f8216f6b RS |
599 | |
600 | /* | |
601 | * ima_eventinodemode_init - include the inode mode as part of the template | |
602 | * data | |
603 | */ | |
604 | int ima_eventinodemode_init(struct ima_event_data *event_data, | |
605 | struct ima_field_data *field_data) | |
606 | { | |
607 | struct inode *inode; | |
608 | umode_t mode; | |
609 | ||
610 | if (!event_data->file) | |
611 | return 0; | |
612 | ||
613 | inode = file_inode(event_data->file); | |
614 | mode = inode->i_mode; | |
615 | if (ima_canonical_fmt) | |
616 | mode = cpu_to_le16(mode); | |
617 | ||
618 | return ima_write_template_field_data((char *)&mode, sizeof(mode), | |
619 | DATA_FMT_UINT, field_data); | |
620 | } |