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> |
8314b673 | 14 | #include <linux/evm.h> |
3ce1217d | 15 | |
4d7aeee7 RS |
16 | static 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 | ||
24 | enum data_formats { | |
25 | DATA_FMT_DIGEST = 0, | |
26 | DATA_FMT_DIGEST_WITH_ALGO, | |
989dc725 | 27 | DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO, |
bcbc9b0c | 28 | DATA_FMT_STRING, |
cde1391a RS |
29 | DATA_FMT_HEX, |
30 | DATA_FMT_UINT | |
4d7aeee7 RS |
31 | }; |
32 | ||
989dc725 MZ |
33 | enum digest_type { |
34 | DIGEST_TYPE_IMA, | |
54f03916 | 35 | DIGEST_TYPE_VERITY, |
989dc725 MZ |
36 | DIGEST_TYPE__LAST |
37 | }; | |
38 | ||
54f03916 | 39 | #define DIGEST_TYPE_NAME_LEN_MAX 7 /* including NUL */ |
989dc725 | 40 | static const char * const digest_type_name[DIGEST_TYPE__LAST] = { |
54f03916 MZ |
41 | [DIGEST_TYPE_IMA] = "ima", |
42 | [DIGEST_TYPE_VERITY] = "verity" | |
989dc725 MZ |
43 | }; |
44 | ||
3ce1217d RS |
45 | static int ima_write_template_field_data(const void *data, const u32 datalen, |
46 | enum data_formats datafmt, | |
47 | struct ima_field_data *field_data) | |
48 | { | |
49 | u8 *buf, *buf_ptr; | |
e3b64c26 | 50 | u32 buflen = datalen; |
3ce1217d | 51 | |
e3b64c26 | 52 | if (datafmt == DATA_FMT_STRING) |
3ce1217d | 53 | buflen = datalen + 1; |
3ce1217d RS |
54 | |
55 | buf = kzalloc(buflen, GFP_KERNEL); | |
56 | if (!buf) | |
57 | return -ENOMEM; | |
58 | ||
59 | memcpy(buf, data, datalen); | |
60 | ||
61 | /* | |
62 | * Replace all space characters with underscore for event names and | |
63 | * strings. This avoid that, during the parsing of a measurements list, | |
64 | * filenames with spaces or that end with the suffix ' (deleted)' are | |
65 | * split into multiple template fields (the space is the delimitator | |
66 | * character for measurements lists in ASCII format). | |
67 | */ | |
e3b64c26 | 68 | if (datafmt == DATA_FMT_STRING) { |
3ce1217d RS |
69 | for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++) |
70 | if (*buf_ptr == ' ') | |
71 | *buf_ptr = '_'; | |
72 | } | |
73 | ||
74 | field_data->data = buf; | |
75 | field_data->len = buflen; | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static void ima_show_template_data_ascii(struct seq_file *m, | |
80 | enum ima_show_type show, | |
81 | enum data_formats datafmt, | |
82 | struct ima_field_data *field_data) | |
83 | { | |
45b26133 MZ |
84 | u8 *buf_ptr = field_data->data; |
85 | u32 buflen = field_data->len; | |
4d7aeee7 | 86 | |
3ce1217d | 87 | switch (datafmt) { |
989dc725 | 88 | case DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO: |
4d7aeee7 | 89 | case DATA_FMT_DIGEST_WITH_ALGO: |
989dc725 | 90 | buf_ptr = strrchr(field_data->data, ':'); |
4d7aeee7 RS |
91 | if (buf_ptr != field_data->data) |
92 | seq_printf(m, "%s", field_data->data); | |
93 | ||
94 | /* skip ':' and '\0' */ | |
95 | buf_ptr += 2; | |
96 | buflen -= buf_ptr - field_data->data; | |
df561f66 | 97 | fallthrough; |
3ce1217d | 98 | case DATA_FMT_DIGEST: |
bcbc9b0c MZ |
99 | case DATA_FMT_HEX: |
100 | if (!buflen) | |
101 | break; | |
4d7aeee7 | 102 | ima_print_digest(m, buf_ptr, buflen); |
3ce1217d RS |
103 | break; |
104 | case DATA_FMT_STRING: | |
4d7aeee7 | 105 | seq_printf(m, "%s", buf_ptr); |
3ce1217d | 106 | break; |
cde1391a RS |
107 | case DATA_FMT_UINT: |
108 | switch (field_data->len) { | |
109 | case sizeof(u8): | |
110 | seq_printf(m, "%u", *(u8 *)buf_ptr); | |
111 | break; | |
112 | case sizeof(u16): | |
113 | if (ima_canonical_fmt) | |
114 | seq_printf(m, "%u", | |
24c9ae23 | 115 | le16_to_cpu(*(__le16 *)buf_ptr)); |
cde1391a RS |
116 | else |
117 | seq_printf(m, "%u", *(u16 *)buf_ptr); | |
118 | break; | |
119 | case sizeof(u32): | |
120 | if (ima_canonical_fmt) | |
121 | seq_printf(m, "%u", | |
24c9ae23 | 122 | le32_to_cpu(*(__le32 *)buf_ptr)); |
cde1391a RS |
123 | else |
124 | seq_printf(m, "%u", *(u32 *)buf_ptr); | |
125 | break; | |
126 | case sizeof(u64): | |
127 | if (ima_canonical_fmt) | |
128 | seq_printf(m, "%llu", | |
24c9ae23 | 129 | le64_to_cpu(*(__le64 *)buf_ptr)); |
cde1391a RS |
130 | else |
131 | seq_printf(m, "%llu", *(u64 *)buf_ptr); | |
132 | break; | |
133 | default: | |
134 | break; | |
135 | } | |
7d2201d4 | 136 | break; |
3ce1217d RS |
137 | default: |
138 | break; | |
139 | } | |
140 | } | |
141 | ||
142 | static void ima_show_template_data_binary(struct seq_file *m, | |
143 | enum ima_show_type show, | |
144 | enum data_formats datafmt, | |
145 | struct ima_field_data *field_data) | |
146 | { | |
c019e307 RS |
147 | u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ? |
148 | strlen(field_data->data) : field_data->len; | |
149 | ||
d68a6fe9 | 150 | if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) { |
6b26285f RS |
151 | u32 field_len = !ima_canonical_fmt ? |
152 | len : (__force u32)cpu_to_le32(len); | |
d68a6fe9 MZ |
153 | |
154 | ima_putc(m, &field_len, sizeof(field_len)); | |
155 | } | |
3e8e5503 | 156 | |
c019e307 | 157 | if (!len) |
3ce1217d | 158 | return; |
3e8e5503 | 159 | |
c019e307 | 160 | ima_putc(m, field_data->data, len); |
3ce1217d RS |
161 | } |
162 | ||
163 | static void ima_show_template_field_data(struct seq_file *m, | |
164 | enum ima_show_type show, | |
165 | enum data_formats datafmt, | |
166 | struct ima_field_data *field_data) | |
167 | { | |
168 | switch (show) { | |
169 | case IMA_SHOW_ASCII: | |
170 | ima_show_template_data_ascii(m, show, datafmt, field_data); | |
171 | break; | |
172 | case IMA_SHOW_BINARY: | |
3e8e5503 | 173 | case IMA_SHOW_BINARY_NO_FIELD_LEN: |
c019e307 | 174 | case IMA_SHOW_BINARY_OLD_STRING_FMT: |
3ce1217d RS |
175 | ima_show_template_data_binary(m, show, datafmt, field_data); |
176 | break; | |
177 | default: | |
178 | break; | |
179 | } | |
180 | } | |
181 | ||
182 | void ima_show_template_digest(struct seq_file *m, enum ima_show_type show, | |
183 | struct ima_field_data *field_data) | |
184 | { | |
185 | ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data); | |
186 | } | |
187 | ||
4d7aeee7 RS |
188 | void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show, |
189 | struct ima_field_data *field_data) | |
190 | { | |
191 | ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO, | |
192 | field_data); | |
193 | } | |
194 | ||
989dc725 MZ |
195 | void ima_show_template_digest_ngv2(struct seq_file *m, enum ima_show_type show, |
196 | struct ima_field_data *field_data) | |
197 | { | |
198 | ima_show_template_field_data(m, show, | |
199 | DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO, | |
200 | field_data); | |
201 | } | |
202 | ||
3ce1217d RS |
203 | void ima_show_template_string(struct seq_file *m, enum ima_show_type show, |
204 | struct ima_field_data *field_data) | |
205 | { | |
206 | ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data); | |
207 | } | |
208 | ||
bcbc9b0c MZ |
209 | void ima_show_template_sig(struct seq_file *m, enum ima_show_type show, |
210 | struct ima_field_data *field_data) | |
211 | { | |
212 | ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data); | |
213 | } | |
214 | ||
86b4da8c PS |
215 | void ima_show_template_buf(struct seq_file *m, enum ima_show_type show, |
216 | struct ima_field_data *field_data) | |
217 | { | |
218 | ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data); | |
219 | } | |
220 | ||
cde1391a RS |
221 | void ima_show_template_uint(struct seq_file *m, enum ima_show_type show, |
222 | struct ima_field_data *field_data) | |
223 | { | |
224 | ima_show_template_field_data(m, show, DATA_FMT_UINT, field_data); | |
225 | } | |
226 | ||
b17fd9ec RS |
227 | /** |
228 | * ima_parse_buf() - Parses lengths and data from an input buffer | |
229 | * @bufstartp: Buffer start address. | |
230 | * @bufendp: Buffer end address. | |
231 | * @bufcurp: Pointer to remaining (non-parsed) data. | |
232 | * @maxfields: Length of fields array. | |
233 | * @fields: Array containing lengths and pointers of parsed data. | |
234 | * @curfields: Number of array items containing parsed data. | |
235 | * @len_mask: Bitmap (if bit is set, data length should not be parsed). | |
236 | * @enforce_mask: Check if curfields == maxfields and/or bufcurp == bufendp. | |
237 | * @bufname: String identifier of the input buffer. | |
238 | * | |
239 | * Return: 0 on success, -EINVAL on error. | |
240 | */ | |
241 | int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp, | |
242 | int maxfields, struct ima_field_data *fields, int *curfields, | |
243 | unsigned long *len_mask, int enforce_mask, char *bufname) | |
244 | { | |
245 | void *bufp = bufstartp; | |
246 | int i; | |
247 | ||
248 | for (i = 0; i < maxfields; i++) { | |
249 | if (len_mask == NULL || !test_bit(i, len_mask)) { | |
250 | if (bufp > (bufendp - sizeof(u32))) | |
251 | break; | |
252 | ||
b17fd9ec | 253 | if (ima_canonical_fmt) |
24c9ae23 RS |
254 | fields[i].len = le32_to_cpu(*(__le32 *)bufp); |
255 | else | |
256 | fields[i].len = *(u32 *)bufp; | |
b17fd9ec RS |
257 | |
258 | bufp += sizeof(u32); | |
259 | } | |
260 | ||
261 | if (bufp > (bufendp - fields[i].len)) | |
262 | break; | |
263 | ||
264 | fields[i].data = bufp; | |
265 | bufp += fields[i].len; | |
266 | } | |
267 | ||
268 | if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) { | |
269 | pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n", | |
270 | bufname, maxfields, i); | |
271 | return -EINVAL; | |
272 | } | |
273 | ||
274 | if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) { | |
275 | pr_err("%s: buf end mismatch: expected: %p, current: %p\n", | |
276 | bufname, bufendp, bufp); | |
277 | return -EINVAL; | |
278 | } | |
279 | ||
280 | if (curfields) | |
281 | *curfields = i; | |
282 | ||
283 | if (bufcurp) | |
284 | *bufcurp = bufp; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
3878d505 | 289 | static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize, |
989dc725 | 290 | u8 digest_type, u8 hash_algo, |
dcf4e392 | 291 | struct ima_field_data *field_data) |
4d7aeee7 RS |
292 | { |
293 | /* | |
294 | * digest formats: | |
295 | * - DATA_FMT_DIGEST: digest | |
64466462 | 296 | * - DATA_FMT_DIGEST_WITH_ALGO: <hash algo> + ':' + '\0' + digest, |
989dc725 MZ |
297 | * - DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO: |
298 | * <digest type> + ':' + <hash algo> + ':' + '\0' + digest, | |
64466462 MZ |
299 | * |
300 | * where 'DATA_FMT_DIGEST' is the original digest format ('d') | |
301 | * with a hash size limitation of 20 bytes, | |
54f03916 | 302 | * where <digest type> is either "ima" or "verity", |
64466462 | 303 | * where <hash algo> is the hash_algo_name[] string. |
4d7aeee7 | 304 | */ |
989dc725 MZ |
305 | u8 buffer[DIGEST_TYPE_NAME_LEN_MAX + CRYPTO_MAX_ALG_NAME + 2 + |
306 | IMA_MAX_DIGEST_SIZE] = { 0 }; | |
4d7aeee7 RS |
307 | enum data_formats fmt = DATA_FMT_DIGEST; |
308 | u32 offset = 0; | |
309 | ||
989dc725 MZ |
310 | if (digest_type < DIGEST_TYPE__LAST && hash_algo < HASH_ALGO__LAST) { |
311 | fmt = DATA_FMT_DIGEST_WITH_TYPE_AND_ALGO; | |
312 | offset += 1 + sprintf(buffer, "%s:%s:", | |
313 | digest_type_name[digest_type], | |
314 | hash_algo_name[hash_algo]); | |
315 | } else if (hash_algo < HASH_ALGO__LAST) { | |
4d7aeee7 | 316 | fmt = DATA_FMT_DIGEST_WITH_ALGO; |
989dc725 MZ |
317 | offset += 1 + sprintf(buffer, "%s:", |
318 | hash_algo_name[hash_algo]); | |
4d7aeee7 RS |
319 | } |
320 | ||
321 | if (digest) | |
322 | memcpy(buffer + offset, digest, digestsize); | |
323 | else | |
324 | /* | |
325 | * If digest is NULL, the event being recorded is a violation. | |
9fab303a MZ |
326 | * Make room for the digest by increasing the offset by the |
327 | * hash algorithm digest size. | |
4d7aeee7 | 328 | */ |
9fab303a | 329 | offset += hash_digest_size[hash_algo]; |
4d7aeee7 RS |
330 | |
331 | return ima_write_template_field_data(buffer, offset + digestsize, | |
332 | fmt, field_data); | |
333 | } | |
334 | ||
3ce1217d | 335 | /* |
4d7aeee7 | 336 | * This function writes the digest of an event (with size limit). |
3ce1217d | 337 | */ |
23b57419 | 338 | int ima_eventdigest_init(struct ima_event_data *event_data, |
3ce1217d RS |
339 | struct ima_field_data *field_data) |
340 | { | |
8c54135e | 341 | struct ima_max_digest_data hash; |
4d7aeee7 RS |
342 | u8 *cur_digest = NULL; |
343 | u32 cur_digestsize = 0; | |
3ce1217d RS |
344 | struct inode *inode; |
345 | int result; | |
346 | ||
347 | memset(&hash, 0, sizeof(hash)); | |
348 | ||
8d94eb9b | 349 | if (event_data->violation) /* recording a violation. */ |
3ce1217d RS |
350 | goto out; |
351 | ||
23b57419 RS |
352 | if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) { |
353 | cur_digest = event_data->iint->ima_hash->digest; | |
354 | cur_digestsize = event_data->iint->ima_hash->length; | |
3ce1217d RS |
355 | goto out; |
356 | } | |
357 | ||
6cc7c266 RS |
358 | if ((const char *)event_data->filename == boot_aggregate_name) { |
359 | if (ima_tpm_chip) { | |
360 | hash.hdr.algo = HASH_ALGO_SHA1; | |
361 | result = ima_calc_boot_aggregate(&hash.hdr); | |
362 | ||
363 | /* algo can change depending on available PCR banks */ | |
364 | if (!result && hash.hdr.algo != HASH_ALGO_SHA1) | |
365 | result = -EINVAL; | |
366 | ||
367 | if (result < 0) | |
368 | memset(&hash, 0, sizeof(hash)); | |
369 | } | |
370 | ||
371 | cur_digest = hash.hdr.digest; | |
372 | cur_digestsize = hash_digest_size[HASH_ALGO_SHA1]; | |
373 | goto out; | |
374 | } | |
375 | ||
23b57419 | 376 | if (!event_data->file) /* missing info to re-calculate the digest */ |
3ce1217d RS |
377 | return -EINVAL; |
378 | ||
23b57419 | 379 | inode = file_inode(event_data->file); |
4d7aeee7 RS |
380 | hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ? |
381 | ima_hash_algo : HASH_ALGO_SHA1; | |
23b57419 | 382 | result = ima_calc_file_hash(event_data->file, &hash.hdr); |
3ce1217d RS |
383 | if (result) { |
384 | integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, | |
23b57419 | 385 | event_data->filename, "collect_data", |
3ce1217d RS |
386 | "failed", result, 0); |
387 | return result; | |
388 | } | |
4d7aeee7 RS |
389 | cur_digest = hash.hdr.digest; |
390 | cur_digestsize = hash.hdr.length; | |
3ce1217d | 391 | out: |
712a49bd | 392 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, |
989dc725 MZ |
393 | DIGEST_TYPE__LAST, HASH_ALGO__LAST, |
394 | field_data); | |
3ce1217d RS |
395 | } |
396 | ||
397 | /* | |
4d7aeee7 | 398 | * This function writes the digest of an event (without size limit). |
3ce1217d | 399 | */ |
23b57419 RS |
400 | int ima_eventdigest_ng_init(struct ima_event_data *event_data, |
401 | struct ima_field_data *field_data) | |
4d7aeee7 | 402 | { |
09091c44 | 403 | u8 *cur_digest = NULL, hash_algo = ima_hash_algo; |
4d7aeee7 RS |
404 | u32 cur_digestsize = 0; |
405 | ||
8d94eb9b | 406 | if (event_data->violation) /* recording a violation. */ |
4d7aeee7 RS |
407 | goto out; |
408 | ||
23b57419 RS |
409 | cur_digest = event_data->iint->ima_hash->digest; |
410 | cur_digestsize = event_data->iint->ima_hash->length; | |
4d7aeee7 | 411 | |
23b57419 | 412 | hash_algo = event_data->iint->ima_hash->algo; |
4d7aeee7 RS |
413 | out: |
414 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
989dc725 MZ |
415 | DIGEST_TYPE__LAST, hash_algo, |
416 | field_data); | |
417 | } | |
418 | ||
419 | /* | |
420 | * This function writes the digest of an event (without size limit), | |
421 | * prefixed with both the digest type and hash algorithm. | |
422 | */ | |
423 | int ima_eventdigest_ngv2_init(struct ima_event_data *event_data, | |
424 | struct ima_field_data *field_data) | |
425 | { | |
426 | u8 *cur_digest = NULL, hash_algo = ima_hash_algo; | |
427 | u32 cur_digestsize = 0; | |
428 | u8 digest_type = DIGEST_TYPE_IMA; | |
429 | ||
430 | if (event_data->violation) /* recording a violation. */ | |
431 | goto out; | |
432 | ||
433 | cur_digest = event_data->iint->ima_hash->digest; | |
434 | cur_digestsize = event_data->iint->ima_hash->length; | |
435 | ||
436 | hash_algo = event_data->iint->ima_hash->algo; | |
54f03916 MZ |
437 | if (event_data->iint->flags & IMA_VERITY_REQUIRED) |
438 | digest_type = DIGEST_TYPE_VERITY; | |
989dc725 MZ |
439 | out: |
440 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
441 | digest_type, hash_algo, | |
442 | field_data); | |
4d7aeee7 RS |
443 | } |
444 | ||
3878d505 TJB |
445 | /* |
446 | * This function writes the digest of the file which is expected to match the | |
447 | * digest contained in the file's appended signature. | |
448 | */ | |
449 | int ima_eventdigest_modsig_init(struct ima_event_data *event_data, | |
450 | struct ima_field_data *field_data) | |
451 | { | |
452 | enum hash_algo hash_algo; | |
453 | const u8 *cur_digest; | |
454 | u32 cur_digestsize; | |
455 | ||
456 | if (!event_data->modsig) | |
457 | return 0; | |
458 | ||
459 | if (event_data->violation) { | |
460 | /* Recording a violation. */ | |
461 | hash_algo = HASH_ALGO_SHA1; | |
462 | cur_digest = NULL; | |
463 | cur_digestsize = 0; | |
464 | } else { | |
465 | int rc; | |
466 | ||
467 | rc = ima_get_modsig_digest(event_data->modsig, &hash_algo, | |
468 | &cur_digest, &cur_digestsize); | |
469 | if (rc) | |
470 | return rc; | |
471 | else if (hash_algo == HASH_ALGO__LAST || cur_digestsize == 0) | |
472 | /* There was some error collecting the digest. */ | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
989dc725 MZ |
477 | DIGEST_TYPE__LAST, hash_algo, |
478 | field_data); | |
3878d505 TJB |
479 | } |
480 | ||
23b57419 | 481 | static int ima_eventname_init_common(struct ima_event_data *event_data, |
4d7aeee7 RS |
482 | struct ima_field_data *field_data, |
483 | bool size_limit) | |
3ce1217d RS |
484 | { |
485 | const char *cur_filename = NULL; | |
486 | u32 cur_filename_len = 0; | |
487 | ||
23b57419 | 488 | BUG_ON(event_data->filename == NULL && event_data->file == NULL); |
3ce1217d | 489 | |
23b57419 RS |
490 | if (event_data->filename) { |
491 | cur_filename = event_data->filename; | |
492 | cur_filename_len = strlen(event_data->filename); | |
3ce1217d | 493 | |
4d7aeee7 | 494 | if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX) |
3ce1217d RS |
495 | goto out; |
496 | } | |
497 | ||
23b57419 RS |
498 | if (event_data->file) { |
499 | cur_filename = event_data->file->f_path.dentry->d_name.name; | |
3ce1217d RS |
500 | cur_filename_len = strlen(cur_filename); |
501 | } else | |
502 | /* | |
503 | * Truncate filename if the latter is too long and | |
504 | * the file descriptor is not available. | |
505 | */ | |
506 | cur_filename_len = IMA_EVENT_NAME_LEN_MAX; | |
507 | out: | |
508 | return ima_write_template_field_data(cur_filename, cur_filename_len, | |
e3b64c26 | 509 | DATA_FMT_STRING, field_data); |
4d7aeee7 RS |
510 | } |
511 | ||
512 | /* | |
513 | * This function writes the name of an event (with size limit). | |
514 | */ | |
23b57419 | 515 | int ima_eventname_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
516 | struct ima_field_data *field_data) |
517 | { | |
23b57419 | 518 | return ima_eventname_init_common(event_data, field_data, true); |
4d7aeee7 RS |
519 | } |
520 | ||
521 | /* | |
522 | * This function writes the name of an event (without size limit). | |
523 | */ | |
23b57419 | 524 | int ima_eventname_ng_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
525 | struct ima_field_data *field_data) |
526 | { | |
23b57419 | 527 | return ima_eventname_init_common(event_data, field_data, false); |
3ce1217d | 528 | } |
bcbc9b0c MZ |
529 | |
530 | /* | |
531 | * ima_eventsig_init - include the file signature as part of the template data | |
532 | */ | |
23b57419 | 533 | int ima_eventsig_init(struct ima_event_data *event_data, |
bcbc9b0c MZ |
534 | struct ima_field_data *field_data) |
535 | { | |
23b57419 | 536 | struct evm_ima_xattr_data *xattr_value = event_data->xattr_value; |
bcbc9b0c | 537 | |
398c42e2 MZ |
538 | if (!xattr_value || |
539 | (xattr_value->type != EVM_IMA_XATTR_DIGSIG && | |
540 | xattr_value->type != IMA_VERITY_DIGSIG)) | |
026d7fc9 | 541 | return ima_eventevmsig_init(event_data, field_data); |
bcbc9b0c | 542 | |
1775cb87 TJB |
543 | return ima_write_template_field_data(xattr_value, event_data->xattr_len, |
544 | DATA_FMT_HEX, field_data); | |
bcbc9b0c | 545 | } |
86b4da8c PS |
546 | |
547 | /* | |
548 | * ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the | |
549 | * template data. | |
550 | */ | |
551 | int ima_eventbuf_init(struct ima_event_data *event_data, | |
552 | struct ima_field_data *field_data) | |
553 | { | |
554 | if ((!event_data->buf) || (event_data->buf_len == 0)) | |
555 | return 0; | |
556 | ||
557 | return ima_write_template_field_data(event_data->buf, | |
558 | event_data->buf_len, DATA_FMT_HEX, | |
559 | field_data); | |
560 | } | |
3878d505 TJB |
561 | |
562 | /* | |
563 | * ima_eventmodsig_init - include the appended file signature as part of the | |
564 | * template data | |
565 | */ | |
566 | int ima_eventmodsig_init(struct ima_event_data *event_data, | |
567 | struct ima_field_data *field_data) | |
568 | { | |
569 | const void *data; | |
570 | u32 data_len; | |
571 | int rc; | |
572 | ||
573 | if (!event_data->modsig) | |
574 | return 0; | |
575 | ||
576 | /* | |
577 | * modsig is a runtime structure containing pointers. Get its raw data | |
578 | * instead. | |
579 | */ | |
580 | rc = ima_get_raw_modsig(event_data->modsig, &data, &data_len); | |
581 | if (rc) | |
582 | return rc; | |
583 | ||
584 | return ima_write_template_field_data(data, data_len, DATA_FMT_HEX, | |
585 | field_data); | |
586 | } | |
026d7fc9 RS |
587 | |
588 | /* | |
589 | * ima_eventevmsig_init - include the EVM portable signature as part of the | |
590 | * template data | |
591 | */ | |
592 | int ima_eventevmsig_init(struct ima_event_data *event_data, | |
593 | struct ima_field_data *field_data) | |
594 | { | |
595 | struct evm_ima_xattr_data *xattr_data = NULL; | |
596 | int rc = 0; | |
597 | ||
598 | if (!event_data->file) | |
599 | return 0; | |
600 | ||
4609e1f1 | 601 | rc = vfs_getxattr_alloc(&nop_mnt_idmap, file_dentry(event_data->file), |
026d7fc9 RS |
602 | XATTR_NAME_EVM, (char **)&xattr_data, 0, |
603 | GFP_NOFS); | |
f6fbd8cb PM |
604 | if (rc <= 0 || xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG) { |
605 | rc = 0; | |
606 | goto out; | |
026d7fc9 RS |
607 | } |
608 | ||
609 | rc = ima_write_template_field_data((char *)xattr_data, rc, DATA_FMT_HEX, | |
610 | field_data); | |
f6fbd8cb PM |
611 | |
612 | out: | |
026d7fc9 RS |
613 | kfree(xattr_data); |
614 | return rc; | |
615 | } | |
7dcfeacc RS |
616 | |
617 | static int ima_eventinodedac_init_common(struct ima_event_data *event_data, | |
618 | struct ima_field_data *field_data, | |
619 | bool get_uid) | |
620 | { | |
621 | unsigned int id; | |
622 | ||
623 | if (!event_data->file) | |
624 | return 0; | |
625 | ||
626 | if (get_uid) | |
627 | id = i_uid_read(file_inode(event_data->file)); | |
628 | else | |
629 | id = i_gid_read(file_inode(event_data->file)); | |
630 | ||
631 | if (ima_canonical_fmt) { | |
632 | if (sizeof(id) == sizeof(u16)) | |
6b26285f | 633 | id = (__force u16)cpu_to_le16(id); |
7dcfeacc | 634 | else |
6b26285f | 635 | id = (__force u32)cpu_to_le32(id); |
7dcfeacc RS |
636 | } |
637 | ||
638 | return ima_write_template_field_data((void *)&id, sizeof(id), | |
639 | DATA_FMT_UINT, field_data); | |
640 | } | |
641 | ||
642 | /* | |
643 | * ima_eventinodeuid_init - include the inode UID as part of the template | |
644 | * data | |
645 | */ | |
646 | int ima_eventinodeuid_init(struct ima_event_data *event_data, | |
647 | struct ima_field_data *field_data) | |
648 | { | |
649 | return ima_eventinodedac_init_common(event_data, field_data, true); | |
650 | } | |
651 | ||
652 | /* | |
653 | * ima_eventinodegid_init - include the inode GID as part of the template | |
654 | * data | |
655 | */ | |
656 | int ima_eventinodegid_init(struct ima_event_data *event_data, | |
657 | struct ima_field_data *field_data) | |
658 | { | |
659 | return ima_eventinodedac_init_common(event_data, field_data, false); | |
660 | } | |
f8216f6b RS |
661 | |
662 | /* | |
663 | * ima_eventinodemode_init - include the inode mode as part of the template | |
664 | * data | |
665 | */ | |
666 | int ima_eventinodemode_init(struct ima_event_data *event_data, | |
667 | struct ima_field_data *field_data) | |
668 | { | |
669 | struct inode *inode; | |
6b26285f | 670 | u16 mode; |
f8216f6b RS |
671 | |
672 | if (!event_data->file) | |
673 | return 0; | |
674 | ||
675 | inode = file_inode(event_data->file); | |
676 | mode = inode->i_mode; | |
677 | if (ima_canonical_fmt) | |
6b26285f | 678 | mode = (__force u16)cpu_to_le16(mode); |
f8216f6b RS |
679 | |
680 | return ima_write_template_field_data((char *)&mode, sizeof(mode), | |
681 | DATA_FMT_UINT, field_data); | |
682 | } | |
8314b673 RS |
683 | |
684 | static int ima_eventinodexattrs_init_common(struct ima_event_data *event_data, | |
685 | struct ima_field_data *field_data, | |
686 | char type) | |
687 | { | |
688 | u8 *buffer = NULL; | |
689 | int rc; | |
690 | ||
691 | if (!event_data->file) | |
692 | return 0; | |
693 | ||
694 | rc = evm_read_protected_xattrs(file_dentry(event_data->file), NULL, 0, | |
695 | type, ima_canonical_fmt); | |
696 | if (rc < 0) | |
697 | return 0; | |
698 | ||
699 | buffer = kmalloc(rc, GFP_KERNEL); | |
700 | if (!buffer) | |
701 | return 0; | |
702 | ||
703 | rc = evm_read_protected_xattrs(file_dentry(event_data->file), buffer, | |
704 | rc, type, ima_canonical_fmt); | |
705 | if (rc < 0) { | |
706 | rc = 0; | |
707 | goto out; | |
708 | } | |
709 | ||
710 | rc = ima_write_template_field_data((char *)buffer, rc, DATA_FMT_HEX, | |
711 | field_data); | |
712 | out: | |
713 | kfree(buffer); | |
714 | return rc; | |
715 | } | |
716 | ||
717 | /* | |
718 | * ima_eventinodexattrnames_init - include a list of xattr names as part of the | |
719 | * template data | |
720 | */ | |
721 | int ima_eventinodexattrnames_init(struct ima_event_data *event_data, | |
722 | struct ima_field_data *field_data) | |
723 | { | |
724 | return ima_eventinodexattrs_init_common(event_data, field_data, 'n'); | |
725 | } | |
726 | ||
727 | /* | |
728 | * ima_eventinodexattrlengths_init - include a list of xattr lengths as part of | |
729 | * the template data | |
730 | */ | |
731 | int ima_eventinodexattrlengths_init(struct ima_event_data *event_data, | |
732 | struct ima_field_data *field_data) | |
733 | { | |
734 | return ima_eventinodexattrs_init_common(event_data, field_data, 'l'); | |
735 | } | |
736 | ||
737 | /* | |
738 | * ima_eventinodexattrvalues_init - include a list of xattr values as part of | |
739 | * the template data | |
740 | */ | |
741 | int ima_eventinodexattrvalues_init(struct ima_event_data *event_data, | |
742 | struct ima_field_data *field_data) | |
743 | { | |
744 | return ima_eventinodexattrs_init_common(event_data, field_data, 'v'); | |
745 | } |