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; |
38aa3f5a GS |
342 | struct ima_digest_data *hash_hdr = container_of(&hash.hdr, |
343 | struct ima_digest_data, hdr); | |
4d7aeee7 RS |
344 | u8 *cur_digest = NULL; |
345 | u32 cur_digestsize = 0; | |
3ce1217d RS |
346 | struct inode *inode; |
347 | int result; | |
348 | ||
349 | memset(&hash, 0, sizeof(hash)); | |
350 | ||
8d94eb9b | 351 | if (event_data->violation) /* recording a violation. */ |
3ce1217d RS |
352 | goto out; |
353 | ||
23b57419 RS |
354 | if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) { |
355 | cur_digest = event_data->iint->ima_hash->digest; | |
356 | cur_digestsize = event_data->iint->ima_hash->length; | |
3ce1217d RS |
357 | goto out; |
358 | } | |
359 | ||
6cc7c266 RS |
360 | if ((const char *)event_data->filename == boot_aggregate_name) { |
361 | if (ima_tpm_chip) { | |
362 | hash.hdr.algo = HASH_ALGO_SHA1; | |
38aa3f5a | 363 | result = ima_calc_boot_aggregate(hash_hdr); |
6cc7c266 RS |
364 | |
365 | /* algo can change depending on available PCR banks */ | |
366 | if (!result && hash.hdr.algo != HASH_ALGO_SHA1) | |
367 | result = -EINVAL; | |
368 | ||
369 | if (result < 0) | |
370 | memset(&hash, 0, sizeof(hash)); | |
371 | } | |
372 | ||
38aa3f5a | 373 | cur_digest = hash_hdr->digest; |
6cc7c266 RS |
374 | cur_digestsize = hash_digest_size[HASH_ALGO_SHA1]; |
375 | goto out; | |
376 | } | |
377 | ||
23b57419 | 378 | if (!event_data->file) /* missing info to re-calculate the digest */ |
3ce1217d RS |
379 | return -EINVAL; |
380 | ||
23b57419 | 381 | inode = file_inode(event_data->file); |
4d7aeee7 RS |
382 | hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ? |
383 | ima_hash_algo : HASH_ALGO_SHA1; | |
38aa3f5a | 384 | result = ima_calc_file_hash(event_data->file, hash_hdr); |
3ce1217d RS |
385 | if (result) { |
386 | integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode, | |
23b57419 | 387 | event_data->filename, "collect_data", |
3ce1217d RS |
388 | "failed", result, 0); |
389 | return result; | |
390 | } | |
38aa3f5a | 391 | cur_digest = hash_hdr->digest; |
4d7aeee7 | 392 | cur_digestsize = hash.hdr.length; |
3ce1217d | 393 | out: |
712a49bd | 394 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, |
989dc725 MZ |
395 | DIGEST_TYPE__LAST, HASH_ALGO__LAST, |
396 | field_data); | |
3ce1217d RS |
397 | } |
398 | ||
399 | /* | |
4d7aeee7 | 400 | * This function writes the digest of an event (without size limit). |
3ce1217d | 401 | */ |
23b57419 RS |
402 | int ima_eventdigest_ng_init(struct ima_event_data *event_data, |
403 | struct ima_field_data *field_data) | |
4d7aeee7 | 404 | { |
09091c44 | 405 | u8 *cur_digest = NULL, hash_algo = ima_hash_algo; |
4d7aeee7 RS |
406 | u32 cur_digestsize = 0; |
407 | ||
8d94eb9b | 408 | if (event_data->violation) /* recording a violation. */ |
4d7aeee7 RS |
409 | goto out; |
410 | ||
23b57419 RS |
411 | cur_digest = event_data->iint->ima_hash->digest; |
412 | cur_digestsize = event_data->iint->ima_hash->length; | |
4d7aeee7 | 413 | |
23b57419 | 414 | hash_algo = event_data->iint->ima_hash->algo; |
4d7aeee7 RS |
415 | out: |
416 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
989dc725 MZ |
417 | DIGEST_TYPE__LAST, hash_algo, |
418 | field_data); | |
419 | } | |
420 | ||
421 | /* | |
422 | * This function writes the digest of an event (without size limit), | |
423 | * prefixed with both the digest type and hash algorithm. | |
424 | */ | |
425 | int ima_eventdigest_ngv2_init(struct ima_event_data *event_data, | |
426 | struct ima_field_data *field_data) | |
427 | { | |
428 | u8 *cur_digest = NULL, hash_algo = ima_hash_algo; | |
429 | u32 cur_digestsize = 0; | |
430 | u8 digest_type = DIGEST_TYPE_IMA; | |
431 | ||
432 | if (event_data->violation) /* recording a violation. */ | |
433 | goto out; | |
434 | ||
435 | cur_digest = event_data->iint->ima_hash->digest; | |
436 | cur_digestsize = event_data->iint->ima_hash->length; | |
437 | ||
438 | hash_algo = event_data->iint->ima_hash->algo; | |
54f03916 MZ |
439 | if (event_data->iint->flags & IMA_VERITY_REQUIRED) |
440 | digest_type = DIGEST_TYPE_VERITY; | |
989dc725 MZ |
441 | out: |
442 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
443 | digest_type, hash_algo, | |
444 | field_data); | |
4d7aeee7 RS |
445 | } |
446 | ||
3878d505 TJB |
447 | /* |
448 | * This function writes the digest of the file which is expected to match the | |
449 | * digest contained in the file's appended signature. | |
450 | */ | |
451 | int ima_eventdigest_modsig_init(struct ima_event_data *event_data, | |
452 | struct ima_field_data *field_data) | |
453 | { | |
454 | enum hash_algo hash_algo; | |
455 | const u8 *cur_digest; | |
456 | u32 cur_digestsize; | |
457 | ||
458 | if (!event_data->modsig) | |
459 | return 0; | |
460 | ||
461 | if (event_data->violation) { | |
462 | /* Recording a violation. */ | |
463 | hash_algo = HASH_ALGO_SHA1; | |
464 | cur_digest = NULL; | |
465 | cur_digestsize = 0; | |
466 | } else { | |
467 | int rc; | |
468 | ||
469 | rc = ima_get_modsig_digest(event_data->modsig, &hash_algo, | |
470 | &cur_digest, &cur_digestsize); | |
471 | if (rc) | |
472 | return rc; | |
473 | else if (hash_algo == HASH_ALGO__LAST || cur_digestsize == 0) | |
474 | /* There was some error collecting the digest. */ | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
478 | return ima_eventdigest_init_common(cur_digest, cur_digestsize, | |
989dc725 MZ |
479 | DIGEST_TYPE__LAST, hash_algo, |
480 | field_data); | |
3878d505 TJB |
481 | } |
482 | ||
23b57419 | 483 | static int ima_eventname_init_common(struct ima_event_data *event_data, |
4d7aeee7 RS |
484 | struct ima_field_data *field_data, |
485 | bool size_limit) | |
3ce1217d RS |
486 | { |
487 | const char *cur_filename = NULL; | |
be84f32b | 488 | struct name_snapshot filename; |
3ce1217d | 489 | u32 cur_filename_len = 0; |
be84f32b SB |
490 | bool snapshot = false; |
491 | int ret; | |
3ce1217d | 492 | |
23b57419 | 493 | BUG_ON(event_data->filename == NULL && event_data->file == NULL); |
3ce1217d | 494 | |
23b57419 RS |
495 | if (event_data->filename) { |
496 | cur_filename = event_data->filename; | |
497 | cur_filename_len = strlen(event_data->filename); | |
3ce1217d | 498 | |
4d7aeee7 | 499 | if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX) |
3ce1217d RS |
500 | goto out; |
501 | } | |
502 | ||
23b57419 | 503 | if (event_data->file) { |
be84f32b SB |
504 | take_dentry_name_snapshot(&filename, |
505 | event_data->file->f_path.dentry); | |
506 | snapshot = true; | |
507 | cur_filename = filename.name.name; | |
3ce1217d RS |
508 | cur_filename_len = strlen(cur_filename); |
509 | } else | |
510 | /* | |
511 | * Truncate filename if the latter is too long and | |
512 | * the file descriptor is not available. | |
513 | */ | |
514 | cur_filename_len = IMA_EVENT_NAME_LEN_MAX; | |
515 | out: | |
be84f32b SB |
516 | ret = ima_write_template_field_data(cur_filename, cur_filename_len, |
517 | DATA_FMT_STRING, field_data); | |
518 | ||
519 | if (snapshot) | |
520 | release_dentry_name_snapshot(&filename); | |
521 | ||
522 | return ret; | |
4d7aeee7 RS |
523 | } |
524 | ||
525 | /* | |
526 | * This function writes the name of an event (with size limit). | |
527 | */ | |
23b57419 | 528 | int ima_eventname_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
529 | struct ima_field_data *field_data) |
530 | { | |
23b57419 | 531 | return ima_eventname_init_common(event_data, field_data, true); |
4d7aeee7 RS |
532 | } |
533 | ||
534 | /* | |
535 | * This function writes the name of an event (without size limit). | |
536 | */ | |
23b57419 | 537 | int ima_eventname_ng_init(struct ima_event_data *event_data, |
4d7aeee7 RS |
538 | struct ima_field_data *field_data) |
539 | { | |
23b57419 | 540 | return ima_eventname_init_common(event_data, field_data, false); |
3ce1217d | 541 | } |
bcbc9b0c MZ |
542 | |
543 | /* | |
544 | * ima_eventsig_init - include the file signature as part of the template data | |
545 | */ | |
23b57419 | 546 | int ima_eventsig_init(struct ima_event_data *event_data, |
bcbc9b0c MZ |
547 | struct ima_field_data *field_data) |
548 | { | |
23b57419 | 549 | struct evm_ima_xattr_data *xattr_value = event_data->xattr_value; |
bcbc9b0c | 550 | |
398c42e2 MZ |
551 | if (!xattr_value || |
552 | (xattr_value->type != EVM_IMA_XATTR_DIGSIG && | |
553 | xattr_value->type != IMA_VERITY_DIGSIG)) | |
026d7fc9 | 554 | return ima_eventevmsig_init(event_data, field_data); |
bcbc9b0c | 555 | |
1775cb87 TJB |
556 | return ima_write_template_field_data(xattr_value, event_data->xattr_len, |
557 | DATA_FMT_HEX, field_data); | |
bcbc9b0c | 558 | } |
86b4da8c PS |
559 | |
560 | /* | |
561 | * ima_eventbuf_init - include the buffer(kexec-cmldine) as part of the | |
562 | * template data. | |
563 | */ | |
564 | int ima_eventbuf_init(struct ima_event_data *event_data, | |
565 | struct ima_field_data *field_data) | |
566 | { | |
567 | if ((!event_data->buf) || (event_data->buf_len == 0)) | |
568 | return 0; | |
569 | ||
570 | return ima_write_template_field_data(event_data->buf, | |
571 | event_data->buf_len, DATA_FMT_HEX, | |
572 | field_data); | |
573 | } | |
3878d505 TJB |
574 | |
575 | /* | |
576 | * ima_eventmodsig_init - include the appended file signature as part of the | |
577 | * template data | |
578 | */ | |
579 | int ima_eventmodsig_init(struct ima_event_data *event_data, | |
580 | struct ima_field_data *field_data) | |
581 | { | |
582 | const void *data; | |
583 | u32 data_len; | |
584 | int rc; | |
585 | ||
586 | if (!event_data->modsig) | |
587 | return 0; | |
588 | ||
589 | /* | |
590 | * modsig is a runtime structure containing pointers. Get its raw data | |
591 | * instead. | |
592 | */ | |
593 | rc = ima_get_raw_modsig(event_data->modsig, &data, &data_len); | |
594 | if (rc) | |
595 | return rc; | |
596 | ||
597 | return ima_write_template_field_data(data, data_len, DATA_FMT_HEX, | |
598 | field_data); | |
599 | } | |
026d7fc9 RS |
600 | |
601 | /* | |
602 | * ima_eventevmsig_init - include the EVM portable signature as part of the | |
603 | * template data | |
604 | */ | |
605 | int ima_eventevmsig_init(struct ima_event_data *event_data, | |
606 | struct ima_field_data *field_data) | |
607 | { | |
608 | struct evm_ima_xattr_data *xattr_data = NULL; | |
609 | int rc = 0; | |
610 | ||
611 | if (!event_data->file) | |
612 | return 0; | |
613 | ||
4609e1f1 | 614 | rc = vfs_getxattr_alloc(&nop_mnt_idmap, file_dentry(event_data->file), |
026d7fc9 RS |
615 | XATTR_NAME_EVM, (char **)&xattr_data, 0, |
616 | GFP_NOFS); | |
f6fbd8cb PM |
617 | if (rc <= 0 || xattr_data->type != EVM_XATTR_PORTABLE_DIGSIG) { |
618 | rc = 0; | |
619 | goto out; | |
026d7fc9 RS |
620 | } |
621 | ||
622 | rc = ima_write_template_field_data((char *)xattr_data, rc, DATA_FMT_HEX, | |
623 | field_data); | |
f6fbd8cb PM |
624 | |
625 | out: | |
026d7fc9 RS |
626 | kfree(xattr_data); |
627 | return rc; | |
628 | } | |
7dcfeacc RS |
629 | |
630 | static int ima_eventinodedac_init_common(struct ima_event_data *event_data, | |
631 | struct ima_field_data *field_data, | |
632 | bool get_uid) | |
633 | { | |
634 | unsigned int id; | |
635 | ||
636 | if (!event_data->file) | |
637 | return 0; | |
638 | ||
639 | if (get_uid) | |
640 | id = i_uid_read(file_inode(event_data->file)); | |
641 | else | |
642 | id = i_gid_read(file_inode(event_data->file)); | |
643 | ||
644 | if (ima_canonical_fmt) { | |
645 | if (sizeof(id) == sizeof(u16)) | |
6b26285f | 646 | id = (__force u16)cpu_to_le16(id); |
7dcfeacc | 647 | else |
6b26285f | 648 | id = (__force u32)cpu_to_le32(id); |
7dcfeacc RS |
649 | } |
650 | ||
651 | return ima_write_template_field_data((void *)&id, sizeof(id), | |
652 | DATA_FMT_UINT, field_data); | |
653 | } | |
654 | ||
655 | /* | |
656 | * ima_eventinodeuid_init - include the inode UID as part of the template | |
657 | * data | |
658 | */ | |
659 | int ima_eventinodeuid_init(struct ima_event_data *event_data, | |
660 | struct ima_field_data *field_data) | |
661 | { | |
662 | return ima_eventinodedac_init_common(event_data, field_data, true); | |
663 | } | |
664 | ||
665 | /* | |
666 | * ima_eventinodegid_init - include the inode GID as part of the template | |
667 | * data | |
668 | */ | |
669 | int ima_eventinodegid_init(struct ima_event_data *event_data, | |
670 | struct ima_field_data *field_data) | |
671 | { | |
672 | return ima_eventinodedac_init_common(event_data, field_data, false); | |
673 | } | |
f8216f6b RS |
674 | |
675 | /* | |
676 | * ima_eventinodemode_init - include the inode mode as part of the template | |
677 | * data | |
678 | */ | |
679 | int ima_eventinodemode_init(struct ima_event_data *event_data, | |
680 | struct ima_field_data *field_data) | |
681 | { | |
682 | struct inode *inode; | |
6b26285f | 683 | u16 mode; |
f8216f6b RS |
684 | |
685 | if (!event_data->file) | |
686 | return 0; | |
687 | ||
688 | inode = file_inode(event_data->file); | |
689 | mode = inode->i_mode; | |
690 | if (ima_canonical_fmt) | |
6b26285f | 691 | mode = (__force u16)cpu_to_le16(mode); |
f8216f6b RS |
692 | |
693 | return ima_write_template_field_data((char *)&mode, sizeof(mode), | |
694 | DATA_FMT_UINT, field_data); | |
695 | } | |
8314b673 RS |
696 | |
697 | static int ima_eventinodexattrs_init_common(struct ima_event_data *event_data, | |
698 | struct ima_field_data *field_data, | |
699 | char type) | |
700 | { | |
701 | u8 *buffer = NULL; | |
702 | int rc; | |
703 | ||
704 | if (!event_data->file) | |
705 | return 0; | |
706 | ||
707 | rc = evm_read_protected_xattrs(file_dentry(event_data->file), NULL, 0, | |
708 | type, ima_canonical_fmt); | |
709 | if (rc < 0) | |
710 | return 0; | |
711 | ||
712 | buffer = kmalloc(rc, GFP_KERNEL); | |
713 | if (!buffer) | |
714 | return 0; | |
715 | ||
716 | rc = evm_read_protected_xattrs(file_dentry(event_data->file), buffer, | |
717 | rc, type, ima_canonical_fmt); | |
718 | if (rc < 0) { | |
719 | rc = 0; | |
720 | goto out; | |
721 | } | |
722 | ||
723 | rc = ima_write_template_field_data((char *)buffer, rc, DATA_FMT_HEX, | |
724 | field_data); | |
725 | out: | |
726 | kfree(buffer); | |
727 | return rc; | |
728 | } | |
729 | ||
730 | /* | |
731 | * ima_eventinodexattrnames_init - include a list of xattr names as part of the | |
732 | * template data | |
733 | */ | |
734 | int ima_eventinodexattrnames_init(struct ima_event_data *event_data, | |
735 | struct ima_field_data *field_data) | |
736 | { | |
737 | return ima_eventinodexattrs_init_common(event_data, field_data, 'n'); | |
738 | } | |
739 | ||
740 | /* | |
741 | * ima_eventinodexattrlengths_init - include a list of xattr lengths as part of | |
742 | * the template data | |
743 | */ | |
744 | int ima_eventinodexattrlengths_init(struct ima_event_data *event_data, | |
745 | struct ima_field_data *field_data) | |
746 | { | |
747 | return ima_eventinodexattrs_init_common(event_data, field_data, 'l'); | |
748 | } | |
749 | ||
750 | /* | |
751 | * ima_eventinodexattrvalues_init - include a list of xattr values as part of | |
752 | * the template data | |
753 | */ | |
754 | int ima_eventinodexattrvalues_init(struct ima_event_data *event_data, | |
755 | struct ima_field_data *field_data) | |
756 | { | |
757 | return ima_eventinodexattrs_init_common(event_data, field_data, 'v'); | |
758 | } |