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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include "ima_template_lib.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};
30
31static 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;
36 u32 buflen = datalen;
37
38 if (datafmt == DATA_FMT_STRING)
39 buflen = datalen + 1;
40
41 buf = kzalloc(buflen, GFP_KERNEL);
42 if (!buf)
43 return -ENOMEM;
44
45 memcpy(buf, data, datalen);
46
47
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51
52
53
54 if (datafmt == DATA_FMT_STRING) {
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
65static 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{
70 u8 *buf_ptr = field_data->data;
71 u32 buflen = field_data->len;
72
73 switch (datafmt) {
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
80 buf_ptr += 2;
81 buflen -= buf_ptr - field_data->data;
82
83 case DATA_FMT_DIGEST:
84 case DATA_FMT_HEX:
85 if (!buflen)
86 break;
87 ima_print_digest(m, buf_ptr, buflen);
88 break;
89 case DATA_FMT_STRING:
90 seq_printf(m, "%s", buf_ptr);
91 break;
92 default:
93 break;
94 }
95}
96
97static void ima_show_template_data_binary(struct seq_file *m,
98 enum ima_show_type show,
99 enum data_formats datafmt,
100 struct ima_field_data *field_data)
101{
102 u32 len = (show == IMA_SHOW_BINARY_OLD_STRING_FMT) ?
103 strlen(field_data->data) : field_data->len;
104
105 if (show != IMA_SHOW_BINARY_NO_FIELD_LEN) {
106 u32 field_len = !ima_canonical_fmt ? len : cpu_to_le32(len);
107
108 ima_putc(m, &field_len, sizeof(field_len));
109 }
110
111 if (!len)
112 return;
113
114 ima_putc(m, field_data->data, len);
115}
116
117static void ima_show_template_field_data(struct seq_file *m,
118 enum ima_show_type show,
119 enum data_formats datafmt,
120 struct ima_field_data *field_data)
121{
122 switch (show) {
123 case IMA_SHOW_ASCII:
124 ima_show_template_data_ascii(m, show, datafmt, field_data);
125 break;
126 case IMA_SHOW_BINARY:
127 case IMA_SHOW_BINARY_NO_FIELD_LEN:
128 case IMA_SHOW_BINARY_OLD_STRING_FMT:
129 ima_show_template_data_binary(m, show, datafmt, field_data);
130 break;
131 default:
132 break;
133 }
134}
135
136void ima_show_template_digest(struct seq_file *m, enum ima_show_type show,
137 struct ima_field_data *field_data)
138{
139 ima_show_template_field_data(m, show, DATA_FMT_DIGEST, field_data);
140}
141
142void ima_show_template_digest_ng(struct seq_file *m, enum ima_show_type show,
143 struct ima_field_data *field_data)
144{
145 ima_show_template_field_data(m, show, DATA_FMT_DIGEST_WITH_ALGO,
146 field_data);
147}
148
149void ima_show_template_string(struct seq_file *m, enum ima_show_type show,
150 struct ima_field_data *field_data)
151{
152 ima_show_template_field_data(m, show, DATA_FMT_STRING, field_data);
153}
154
155void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
156 struct ima_field_data *field_data)
157{
158 ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
159}
160
161void ima_show_template_buf(struct seq_file *m, enum ima_show_type show,
162 struct ima_field_data *field_data)
163{
164 ima_show_template_field_data(m, show, DATA_FMT_HEX, field_data);
165}
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180
181int ima_parse_buf(void *bufstartp, void *bufendp, void **bufcurp,
182 int maxfields, struct ima_field_data *fields, int *curfields,
183 unsigned long *len_mask, int enforce_mask, char *bufname)
184{
185 void *bufp = bufstartp;
186 int i;
187
188 for (i = 0; i < maxfields; i++) {
189 if (len_mask == NULL || !test_bit(i, len_mask)) {
190 if (bufp > (bufendp - sizeof(u32)))
191 break;
192
193 fields[i].len = *(u32 *)bufp;
194 if (ima_canonical_fmt)
195 fields[i].len = le32_to_cpu(fields[i].len);
196
197 bufp += sizeof(u32);
198 }
199
200 if (bufp > (bufendp - fields[i].len))
201 break;
202
203 fields[i].data = bufp;
204 bufp += fields[i].len;
205 }
206
207 if ((enforce_mask & ENFORCE_FIELDS) && i != maxfields) {
208 pr_err("%s: nr of fields mismatch: expected: %d, current: %d\n",
209 bufname, maxfields, i);
210 return -EINVAL;
211 }
212
213 if ((enforce_mask & ENFORCE_BUFEND) && bufp != bufendp) {
214 pr_err("%s: buf end mismatch: expected: %p, current: %p\n",
215 bufname, bufendp, bufp);
216 return -EINVAL;
217 }
218
219 if (curfields)
220 *curfields = i;
221
222 if (bufcurp)
223 *bufcurp = bufp;
224
225 return 0;
226}
227
228static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
229 struct ima_field_data *field_data)
230{
231
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236
237
238 u8 buffer[CRYPTO_MAX_ALG_NAME + 2 + IMA_MAX_DIGEST_SIZE] = { 0 };
239 enum data_formats fmt = DATA_FMT_DIGEST;
240 u32 offset = 0;
241
242 if (hash_algo < HASH_ALGO__LAST) {
243 fmt = DATA_FMT_DIGEST_WITH_ALGO;
244 offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
245 hash_algo_name[hash_algo]);
246 buffer[offset] = ':';
247 offset += 2;
248 }
249
250 if (digest)
251 memcpy(buffer + offset, digest, digestsize);
252 else
253
254
255
256
257
258 offset += IMA_DIGEST_SIZE;
259
260 return ima_write_template_field_data(buffer, offset + digestsize,
261 fmt, field_data);
262}
263
264
265
266
267int ima_eventdigest_init(struct ima_event_data *event_data,
268 struct ima_field_data *field_data)
269{
270 struct {
271 struct ima_digest_data hdr;
272 char digest[IMA_MAX_DIGEST_SIZE];
273 } hash;
274 u8 *cur_digest = NULL;
275 u32 cur_digestsize = 0;
276 struct inode *inode;
277 int result;
278
279 memset(&hash, 0, sizeof(hash));
280
281 if (event_data->violation)
282 goto out;
283
284 if (ima_template_hash_algo_allowed(event_data->iint->ima_hash->algo)) {
285 cur_digest = event_data->iint->ima_hash->digest;
286 cur_digestsize = event_data->iint->ima_hash->length;
287 goto out;
288 }
289
290 if (!event_data->file)
291 return -EINVAL;
292
293 inode = file_inode(event_data->file);
294 hash.hdr.algo = ima_template_hash_algo_allowed(ima_hash_algo) ?
295 ima_hash_algo : HASH_ALGO_SHA1;
296 result = ima_calc_file_hash(event_data->file, &hash.hdr);
297 if (result) {
298 integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
299 event_data->filename, "collect_data",
300 "failed", result, 0);
301 return result;
302 }
303 cur_digest = hash.hdr.digest;
304 cur_digestsize = hash.hdr.length;
305out:
306 return ima_eventdigest_init_common(cur_digest, cur_digestsize,
307 HASH_ALGO__LAST, field_data);
308}
309
310
311
312
313int ima_eventdigest_ng_init(struct ima_event_data *event_data,
314 struct ima_field_data *field_data)
315{
316 u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
317 u32 cur_digestsize = 0;
318
319 if (event_data->violation)
320 goto out;
321
322 cur_digest = event_data->iint->ima_hash->digest;
323 cur_digestsize = event_data->iint->ima_hash->length;
324
325 hash_algo = event_data->iint->ima_hash->algo;
326out:
327 return ima_eventdigest_init_common(cur_digest, cur_digestsize,
328 hash_algo, field_data);
329}
330
331static int ima_eventname_init_common(struct ima_event_data *event_data,
332 struct ima_field_data *field_data,
333 bool size_limit)
334{
335 const char *cur_filename = NULL;
336 u32 cur_filename_len = 0;
337
338 BUG_ON(event_data->filename == NULL && event_data->file == NULL);
339
340 if (event_data->filename) {
341 cur_filename = event_data->filename;
342 cur_filename_len = strlen(event_data->filename);
343
344 if (!size_limit || cur_filename_len <= IMA_EVENT_NAME_LEN_MAX)
345 goto out;
346 }
347
348 if (event_data->file) {
349 cur_filename = event_data->file->f_path.dentry->d_name.name;
350 cur_filename_len = strlen(cur_filename);
351 } else
352
353
354
355
356 cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
357out:
358 return ima_write_template_field_data(cur_filename, cur_filename_len,
359 DATA_FMT_STRING, field_data);
360}
361
362
363
364
365int ima_eventname_init(struct ima_event_data *event_data,
366 struct ima_field_data *field_data)
367{
368 return ima_eventname_init_common(event_data, field_data, true);
369}
370
371
372
373
374int ima_eventname_ng_init(struct ima_event_data *event_data,
375 struct ima_field_data *field_data)
376{
377 return ima_eventname_init_common(event_data, field_data, false);
378}
379
380
381
382
383int ima_eventsig_init(struct ima_event_data *event_data,
384 struct ima_field_data *field_data)
385{
386 struct evm_ima_xattr_data *xattr_value = event_data->xattr_value;
387
388 if ((!xattr_value) || (xattr_value->type != EVM_IMA_XATTR_DIGSIG))
389 return 0;
390
391 return ima_write_template_field_data(xattr_value, event_data->xattr_len,
392 DATA_FMT_HEX, field_data);
393}
394
395
396
397
398
399int ima_eventbuf_init(struct ima_event_data *event_data,
400 struct ima_field_data *field_data)
401{
402 if ((!event_data->buf) || (event_data->buf_len == 0))
403 return 0;
404
405 return ima_write_template_field_data(event_data->buf,
406 event_data->buf_len, DATA_FMT_HEX,
407 field_data);
408}
409