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Commit | Line | Data |
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736ec752 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor functions for unpacking policy loaded from | |
5 | * userspace. | |
6 | * | |
7 | * Copyright (C) 1998-2008 Novell/SUSE | |
8 | * Copyright 2009-2010 Canonical Ltd. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation, version 2 of the | |
13 | * License. | |
14 | * | |
d410fa4e | 15 | * AppArmor uses a serialized binary format for loading policy. To find |
26fccd9e | 16 | * policy format documentation see Documentation/admin-guide/LSM/apparmor.rst |
736ec752 JJ |
17 | * All policy is validated before it is used. |
18 | */ | |
19 | ||
20 | #include <asm/unaligned.h> | |
21 | #include <linux/ctype.h> | |
22 | #include <linux/errno.h> | |
23 | ||
24 | #include "include/apparmor.h" | |
25 | #include "include/audit.h" | |
26 | #include "include/context.h" | |
f8eb8a13 | 27 | #include "include/crypto.h" |
736ec752 | 28 | #include "include/match.h" |
637f688d | 29 | #include "include/path.h" |
736ec752 JJ |
30 | #include "include/policy.h" |
31 | #include "include/policy_unpack.h" | |
736ec752 | 32 | |
474d6b75 | 33 | #define K_ABI_MASK 0x3ff |
5ebfb128 | 34 | #define FORCE_COMPLAIN_FLAG 0x800 |
474d6b75 JJ |
35 | #define VERSION_LT(X, Y) (((X) & K_ABI_MASK) < ((Y) & K_ABI_MASK)) |
36 | #define VERSION_GT(X, Y) (((X) & K_ABI_MASK) > ((Y) & K_ABI_MASK)) | |
37 | ||
38 | #define v5 5 /* base version */ | |
39 | #define v6 6 /* per entry policydb mediation check */ | |
40 | #define v7 7 /* full network masking */ | |
5ebfb128 | 41 | |
736ec752 JJ |
42 | /* |
43 | * The AppArmor interface treats data as a type byte followed by the | |
44 | * actual data. The interface has the notion of a a named entry | |
45 | * which has a name (AA_NAME typecode followed by name string) followed by | |
46 | * the entries typecode and data. Named types allow for optional | |
47 | * elements and extensions to be added and tested for without breaking | |
48 | * backwards compatibility. | |
49 | */ | |
50 | ||
51 | enum aa_code { | |
52 | AA_U8, | |
53 | AA_U16, | |
54 | AA_U32, | |
55 | AA_U64, | |
56 | AA_NAME, /* same as string except it is items name */ | |
57 | AA_STRING, | |
58 | AA_BLOB, | |
59 | AA_STRUCT, | |
60 | AA_STRUCTEND, | |
61 | AA_LIST, | |
62 | AA_LISTEND, | |
63 | AA_ARRAY, | |
64 | AA_ARRAYEND, | |
65 | }; | |
66 | ||
67 | /* | |
68 | * aa_ext is the read of the buffer containing the serialized profile. The | |
69 | * data is copied into a kernel buffer in apparmorfs and then handed off to | |
70 | * the unpack routines. | |
71 | */ | |
72 | struct aa_ext { | |
73 | void *start; | |
74 | void *end; | |
75 | void *pos; /* pointer to current position in the buffer */ | |
76 | u32 version; | |
77 | }; | |
78 | ||
79 | /* audit callback for unpack fields */ | |
80 | static void audit_cb(struct audit_buffer *ab, void *va) | |
81 | { | |
82 | struct common_audit_data *sa = va; | |
ef88a7ac JJ |
83 | |
84 | if (aad(sa)->iface.ns) { | |
85 | audit_log_format(ab, " ns="); | |
86 | audit_log_untrustedstring(ab, aad(sa)->iface.ns); | |
87 | } | |
2410aa96 | 88 | if (aad(sa)->name) { |
736ec752 | 89 | audit_log_format(ab, " name="); |
2410aa96 | 90 | audit_log_untrustedstring(ab, aad(sa)->name); |
736ec752 | 91 | } |
ef88a7ac JJ |
92 | if (aad(sa)->iface.pos) |
93 | audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos); | |
736ec752 JJ |
94 | } |
95 | ||
96 | /** | |
97 | * audit_iface - do audit message for policy unpacking/load/replace/remove | |
98 | * @new: profile if it has been allocated (MAYBE NULL) | |
04dc715e | 99 | * @ns_name: name of the ns the profile is to be loaded to (MAY BE NULL) |
736ec752 JJ |
100 | * @name: name of the profile being manipulated (MAYBE NULL) |
101 | * @info: any extra info about the failure (MAYBE NULL) | |
b1b4bc2e | 102 | * @e: buffer position info |
736ec752 JJ |
103 | * @error: error code |
104 | * | |
105 | * Returns: %0 or error | |
106 | */ | |
04dc715e JJ |
107 | static int audit_iface(struct aa_profile *new, const char *ns_name, |
108 | const char *name, const char *info, struct aa_ext *e, | |
109 | int error) | |
736ec752 | 110 | { |
637f688d | 111 | struct aa_profile *profile = labels_profile(aa_current_raw_label()); |
ef88a7ac | 112 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, NULL); |
b1b4bc2e | 113 | if (e) |
ef88a7ac JJ |
114 | aad(&sa)->iface.pos = e->pos - e->start; |
115 | aad(&sa)->iface.ns = ns_name; | |
116 | if (new) | |
2410aa96 | 117 | aad(&sa)->name = new->base.hname; |
ef88a7ac | 118 | else |
2410aa96 | 119 | aad(&sa)->name = name; |
ef88a7ac JJ |
120 | aad(&sa)->info = info; |
121 | aad(&sa)->error = error; | |
736ec752 | 122 | |
ef88a7ac | 123 | return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb); |
736ec752 JJ |
124 | } |
125 | ||
5d5182ca JJ |
126 | void __aa_loaddata_update(struct aa_loaddata *data, long revision) |
127 | { | |
128 | AA_BUG(!data); | |
129 | AA_BUG(!data->ns); | |
130 | AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]); | |
131 | AA_BUG(!mutex_is_locked(&data->ns->lock)); | |
132 | AA_BUG(data->revision > revision); | |
133 | ||
134 | data->revision = revision; | |
135 | d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime = | |
136 | current_time(d_inode(data->dents[AAFS_LOADDATA_DIR])); | |
137 | d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime = | |
138 | current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION])); | |
139 | } | |
140 | ||
141 | bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r) | |
142 | { | |
143 | if (l->size != r->size) | |
144 | return false; | |
145 | if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0) | |
146 | return false; | |
147 | return memcmp(l->data, r->data, r->size) == 0; | |
148 | } | |
149 | ||
150 | /* | |
151 | * need to take the ns mutex lock which is NOT safe most places that | |
152 | * put_loaddata is called, so we have to delay freeing it | |
153 | */ | |
154 | static void do_loaddata_free(struct work_struct *work) | |
155 | { | |
156 | struct aa_loaddata *d = container_of(work, struct aa_loaddata, work); | |
157 | struct aa_ns *ns = aa_get_ns(d->ns); | |
158 | ||
159 | if (ns) { | |
feb3c766 | 160 | mutex_lock_nested(&ns->lock, ns->level); |
5d5182ca JJ |
161 | __aa_fs_remove_rawdata(d); |
162 | mutex_unlock(&ns->lock); | |
163 | aa_put_ns(ns); | |
164 | } | |
165 | ||
166 | kzfree(d->hash); | |
167 | kfree(d->name); | |
168 | kvfree(d); | |
169 | } | |
170 | ||
5ac8c355 JJ |
171 | void aa_loaddata_kref(struct kref *kref) |
172 | { | |
173 | struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count); | |
174 | ||
175 | if (d) { | |
5d5182ca JJ |
176 | INIT_WORK(&d->work, do_loaddata_free); |
177 | schedule_work(&d->work); | |
5ac8c355 JJ |
178 | } |
179 | } | |
180 | ||
5d5182ca JJ |
181 | struct aa_loaddata *aa_loaddata_alloc(size_t size) |
182 | { | |
183 | struct aa_loaddata *d = kvzalloc(sizeof(*d) + size, GFP_KERNEL); | |
184 | ||
185 | if (d == NULL) | |
186 | return ERR_PTR(-ENOMEM); | |
187 | kref_init(&d->count); | |
188 | INIT_LIST_HEAD(&d->list); | |
189 | ||
190 | return d; | |
191 | } | |
192 | ||
736ec752 JJ |
193 | /* test if read will be in packed data bounds */ |
194 | static bool inbounds(struct aa_ext *e, size_t size) | |
195 | { | |
196 | return (size <= e->end - e->pos); | |
197 | } | |
198 | ||
199 | /** | |
200 | * aa_u16_chunck - test and do bounds checking for a u16 size based chunk | |
201 | * @e: serialized data read head (NOT NULL) | |
202 | * @chunk: start address for chunk of data (NOT NULL) | |
203 | * | |
204 | * Returns: the size of chunk found with the read head at the end of the chunk. | |
205 | */ | |
206 | static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk) | |
207 | { | |
208 | size_t size = 0; | |
209 | ||
210 | if (!inbounds(e, sizeof(u16))) | |
211 | return 0; | |
2c17cd36 JJ |
212 | size = le16_to_cpu(get_unaligned((__le16 *) e->pos)); |
213 | e->pos += sizeof(__le16); | |
736ec752 JJ |
214 | if (!inbounds(e, size)) |
215 | return 0; | |
216 | *chunk = e->pos; | |
217 | e->pos += size; | |
218 | return size; | |
219 | } | |
220 | ||
221 | /* unpack control byte */ | |
222 | static bool unpack_X(struct aa_ext *e, enum aa_code code) | |
223 | { | |
224 | if (!inbounds(e, 1)) | |
225 | return 0; | |
226 | if (*(u8 *) e->pos != code) | |
227 | return 0; | |
228 | e->pos++; | |
229 | return 1; | |
230 | } | |
231 | ||
232 | /** | |
233 | * unpack_nameX - check is the next element is of type X with a name of @name | |
234 | * @e: serialized data extent information (NOT NULL) | |
235 | * @code: type code | |
236 | * @name: name to match to the serialized element. (MAYBE NULL) | |
237 | * | |
238 | * check that the next serialized data element is of type X and has a tag | |
239 | * name @name. If @name is specified then there must be a matching | |
240 | * name element in the stream. If @name is NULL any name element will be | |
241 | * skipped and only the typecode will be tested. | |
242 | * | |
243 | * Returns 1 on success (both type code and name tests match) and the read | |
244 | * head is advanced past the headers | |
245 | * | |
246 | * Returns: 0 if either match fails, the read head does not move | |
247 | */ | |
248 | static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name) | |
249 | { | |
250 | /* | |
251 | * May need to reset pos if name or type doesn't match | |
252 | */ | |
253 | void *pos = e->pos; | |
254 | /* | |
255 | * Check for presence of a tagname, and if present name size | |
256 | * AA_NAME tag value is a u16. | |
257 | */ | |
258 | if (unpack_X(e, AA_NAME)) { | |
259 | char *tag = NULL; | |
260 | size_t size = unpack_u16_chunk(e, &tag); | |
261 | /* if a name is specified it must match. otherwise skip tag */ | |
262 | if (name && (!size || strcmp(name, tag))) | |
263 | goto fail; | |
264 | } else if (name) { | |
265 | /* if a name is specified and there is no name tag fail */ | |
266 | goto fail; | |
267 | } | |
268 | ||
269 | /* now check if type code matches */ | |
270 | if (unpack_X(e, code)) | |
271 | return 1; | |
272 | ||
273 | fail: | |
274 | e->pos = pos; | |
275 | return 0; | |
276 | } | |
277 | ||
5c3f5639 JJ |
278 | static bool unpack_u16(struct aa_ext *e, u16 *data, const char *name) |
279 | { | |
280 | if (unpack_nameX(e, AA_U16, name)) { | |
281 | if (!inbounds(e, sizeof(u16))) | |
282 | return 0; | |
283 | if (data) | |
284 | *data = le16_to_cpu(get_unaligned((__le16 *) e->pos)); | |
285 | e->pos += sizeof(u16); | |
286 | return 1; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
736ec752 JJ |
291 | static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name) |
292 | { | |
293 | if (unpack_nameX(e, AA_U32, name)) { | |
294 | if (!inbounds(e, sizeof(u32))) | |
295 | return 0; | |
296 | if (data) | |
2c17cd36 | 297 | *data = le32_to_cpu(get_unaligned((__le32 *) e->pos)); |
736ec752 JJ |
298 | e->pos += sizeof(u32); |
299 | return 1; | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name) | |
305 | { | |
306 | if (unpack_nameX(e, AA_U64, name)) { | |
307 | if (!inbounds(e, sizeof(u64))) | |
308 | return 0; | |
309 | if (data) | |
2c17cd36 | 310 | *data = le64_to_cpu(get_unaligned((__le64 *) e->pos)); |
736ec752 JJ |
311 | e->pos += sizeof(u64); |
312 | return 1; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static size_t unpack_array(struct aa_ext *e, const char *name) | |
318 | { | |
319 | if (unpack_nameX(e, AA_ARRAY, name)) { | |
320 | int size; | |
321 | if (!inbounds(e, sizeof(u16))) | |
322 | return 0; | |
2c17cd36 | 323 | size = (int)le16_to_cpu(get_unaligned((__le16 *) e->pos)); |
736ec752 JJ |
324 | e->pos += sizeof(u16); |
325 | return size; | |
326 | } | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name) | |
331 | { | |
332 | if (unpack_nameX(e, AA_BLOB, name)) { | |
333 | u32 size; | |
334 | if (!inbounds(e, sizeof(u32))) | |
335 | return 0; | |
2c17cd36 | 336 | size = le32_to_cpu(get_unaligned((__le32 *) e->pos)); |
736ec752 JJ |
337 | e->pos += sizeof(u32); |
338 | if (inbounds(e, (size_t) size)) { | |
339 | *blob = e->pos; | |
340 | e->pos += size; | |
341 | return size; | |
342 | } | |
343 | } | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int unpack_str(struct aa_ext *e, const char **string, const char *name) | |
348 | { | |
349 | char *src_str; | |
350 | size_t size = 0; | |
351 | void *pos = e->pos; | |
352 | *string = NULL; | |
353 | if (unpack_nameX(e, AA_STRING, name)) { | |
354 | size = unpack_u16_chunk(e, &src_str); | |
355 | if (size) { | |
356 | /* strings are null terminated, length is size - 1 */ | |
357 | if (src_str[size - 1] != 0) | |
358 | goto fail; | |
359 | *string = src_str; | |
360 | } | |
361 | } | |
362 | return size; | |
363 | ||
364 | fail: | |
365 | e->pos = pos; | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static int unpack_strdup(struct aa_ext *e, char **string, const char *name) | |
370 | { | |
371 | const char *tmp; | |
372 | void *pos = e->pos; | |
373 | int res = unpack_str(e, &tmp, name); | |
374 | *string = NULL; | |
375 | ||
376 | if (!res) | |
377 | return 0; | |
378 | ||
379 | *string = kmemdup(tmp, res, GFP_KERNEL); | |
380 | if (!*string) { | |
381 | e->pos = pos; | |
382 | return 0; | |
383 | } | |
384 | ||
385 | return res; | |
386 | } | |
387 | ||
180a6f59 JJ |
388 | #define DFA_VALID_PERM_MASK 0xffffffff |
389 | #define DFA_VALID_PERM2_MASK 0xffffffff | |
390 | ||
736ec752 JJ |
391 | /** |
392 | * verify_accept - verify the accept tables of a dfa | |
393 | * @dfa: dfa to verify accept tables of (NOT NULL) | |
394 | * @flags: flags governing dfa | |
395 | * | |
396 | * Returns: 1 if valid accept tables else 0 if error | |
397 | */ | |
398 | static bool verify_accept(struct aa_dfa *dfa, int flags) | |
399 | { | |
400 | int i; | |
401 | ||
402 | /* verify accept permissions */ | |
403 | for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) { | |
404 | int mode = ACCEPT_TABLE(dfa)[i]; | |
405 | ||
406 | if (mode & ~DFA_VALID_PERM_MASK) | |
407 | return 0; | |
408 | ||
409 | if (ACCEPT_TABLE2(dfa)[i] & ~DFA_VALID_PERM2_MASK) | |
410 | return 0; | |
411 | } | |
412 | return 1; | |
413 | } | |
414 | ||
415 | /** | |
416 | * unpack_dfa - unpack a file rule dfa | |
417 | * @e: serialized data extent information (NOT NULL) | |
418 | * | |
419 | * returns dfa or ERR_PTR or NULL if no dfa | |
420 | */ | |
421 | static struct aa_dfa *unpack_dfa(struct aa_ext *e) | |
422 | { | |
423 | char *blob = NULL; | |
424 | size_t size; | |
425 | struct aa_dfa *dfa = NULL; | |
426 | ||
427 | size = unpack_blob(e, &blob, "aadfa"); | |
428 | if (size) { | |
429 | /* | |
430 | * The dfa is aligned with in the blob to 8 bytes | |
431 | * from the beginning of the stream. | |
dd51c848 | 432 | * alignment adjust needed by dfa unpack |
736ec752 | 433 | */ |
dd51c848 JJ |
434 | size_t sz = blob - (char *) e->start - |
435 | ((e->pos - e->start) & 7); | |
736ec752 JJ |
436 | size_t pad = ALIGN(sz, 8) - sz; |
437 | int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) | | |
abbf8734 | 438 | TO_ACCEPT2_FLAG(YYTD_DATA32) | DFA_FLAG_VERIFY_STATES; |
736ec752 JJ |
439 | dfa = aa_dfa_unpack(blob + pad, size - pad, flags); |
440 | ||
441 | if (IS_ERR(dfa)) | |
442 | return dfa; | |
443 | ||
444 | if (!verify_accept(dfa, flags)) | |
445 | goto fail; | |
446 | } | |
447 | ||
448 | return dfa; | |
449 | ||
450 | fail: | |
451 | aa_put_dfa(dfa); | |
452 | return ERR_PTR(-EPROTO); | |
453 | } | |
454 | ||
455 | /** | |
456 | * unpack_trans_table - unpack a profile transition table | |
457 | * @e: serialized data extent information (NOT NULL) | |
458 | * @profile: profile to add the accept table to (NOT NULL) | |
459 | * | |
25985edc | 460 | * Returns: 1 if table successfully unpacked |
736ec752 JJ |
461 | */ |
462 | static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile) | |
463 | { | |
19fe43a5 | 464 | void *saved_pos = e->pos; |
736ec752 JJ |
465 | |
466 | /* exec table is optional */ | |
467 | if (unpack_nameX(e, AA_STRUCT, "xtable")) { | |
468 | int i, size; | |
469 | ||
470 | size = unpack_array(e, NULL); | |
471 | /* currently 4 exec bits and entries 0-3 are reserved iupcx */ | |
472 | if (size > 16 - 4) | |
473 | goto fail; | |
474 | profile->file.trans.table = kzalloc(sizeof(char *) * size, | |
475 | GFP_KERNEL); | |
476 | if (!profile->file.trans.table) | |
477 | goto fail; | |
478 | ||
479 | profile->file.trans.size = size; | |
480 | for (i = 0; i < size; i++) { | |
481 | char *str; | |
5379a331 | 482 | int c, j, pos, size2 = unpack_strdup(e, &str, NULL); |
736ec752 JJ |
483 | /* unpack_strdup verifies that the last character is |
484 | * null termination byte. | |
485 | */ | |
7ee95850 | 486 | if (!size2) |
736ec752 JJ |
487 | goto fail; |
488 | profile->file.trans.table[i] = str; | |
489 | /* verify that name doesn't start with space */ | |
490 | if (isspace(*str)) | |
491 | goto fail; | |
492 | ||
493 | /* count internal # of internal \0 */ | |
5379a331 JJ |
494 | for (c = j = 0; j < size2 - 1; j++) { |
495 | if (!str[j]) { | |
496 | pos = j; | |
736ec752 | 497 | c++; |
5379a331 | 498 | } |
736ec752 JJ |
499 | } |
500 | if (*str == ':') { | |
5379a331 JJ |
501 | /* first character after : must be valid */ |
502 | if (!str[1]) | |
503 | goto fail; | |
736ec752 JJ |
504 | /* beginning with : requires an embedded \0, |
505 | * verify that exactly 1 internal \0 exists | |
506 | * trailing \0 already verified by unpack_strdup | |
5379a331 JJ |
507 | * |
508 | * convert \0 back to : for label_parse | |
736ec752 | 509 | */ |
5379a331 JJ |
510 | if (c == 1) |
511 | str[pos] = ':'; | |
512 | else if (c > 1) | |
736ec752 JJ |
513 | goto fail; |
514 | } else if (c) | |
515 | /* fail - all other cases with embedded \0 */ | |
516 | goto fail; | |
517 | } | |
518 | if (!unpack_nameX(e, AA_ARRAYEND, NULL)) | |
519 | goto fail; | |
520 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) | |
521 | goto fail; | |
522 | } | |
523 | return 1; | |
524 | ||
525 | fail: | |
526 | aa_free_domain_entries(&profile->file.trans); | |
19fe43a5 | 527 | e->pos = saved_pos; |
736ec752 JJ |
528 | return 0; |
529 | } | |
530 | ||
531 | static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile) | |
532 | { | |
533 | void *pos = e->pos; | |
534 | ||
535 | /* rlimits are optional */ | |
536 | if (unpack_nameX(e, AA_STRUCT, "rlimits")) { | |
537 | int i, size; | |
538 | u32 tmp = 0; | |
539 | if (!unpack_u32(e, &tmp, NULL)) | |
540 | goto fail; | |
541 | profile->rlimits.mask = tmp; | |
542 | ||
543 | size = unpack_array(e, NULL); | |
544 | if (size > RLIM_NLIMITS) | |
545 | goto fail; | |
546 | for (i = 0; i < size; i++) { | |
7ee95850 | 547 | u64 tmp2 = 0; |
736ec752 | 548 | int a = aa_map_resource(i); |
7ee95850 | 549 | if (!unpack_u64(e, &tmp2, NULL)) |
736ec752 | 550 | goto fail; |
7ee95850 | 551 | profile->rlimits.limits[a].rlim_max = tmp2; |
736ec752 JJ |
552 | } |
553 | if (!unpack_nameX(e, AA_ARRAYEND, NULL)) | |
554 | goto fail; | |
555 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) | |
556 | goto fail; | |
557 | } | |
558 | return 1; | |
559 | ||
560 | fail: | |
561 | e->pos = pos; | |
562 | return 0; | |
563 | } | |
564 | ||
e025be0f WH |
565 | static void *kvmemdup(const void *src, size_t len) |
566 | { | |
a7c3e901 | 567 | void *p = kvmalloc(len, GFP_KERNEL); |
e025be0f WH |
568 | |
569 | if (p) | |
570 | memcpy(p, src, len); | |
571 | return p; | |
572 | } | |
573 | ||
574 | static u32 strhash(const void *data, u32 len, u32 seed) | |
575 | { | |
576 | const char * const *key = data; | |
577 | ||
578 | return jhash(*key, strlen(*key), seed); | |
579 | } | |
580 | ||
581 | static int datacmp(struct rhashtable_compare_arg *arg, const void *obj) | |
582 | { | |
583 | const struct aa_data *data = obj; | |
584 | const char * const *key = arg->key; | |
585 | ||
586 | return strcmp(data->key, *key); | |
587 | } | |
588 | ||
736ec752 JJ |
589 | /** |
590 | * unpack_profile - unpack a serialized profile | |
591 | * @e: serialized data extent information (NOT NULL) | |
592 | * | |
593 | * NOTE: unpack profile sets audit struct if there is a failure | |
594 | */ | |
04dc715e | 595 | static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name) |
736ec752 JJ |
596 | { |
597 | struct aa_profile *profile = NULL; | |
04dc715e | 598 | const char *tmpname, *tmpns = NULL, *name = NULL; |
2410aa96 | 599 | const char *info = "failed to unpack profile"; |
5c3f5639 | 600 | size_t size = 0, ns_len; |
e025be0f WH |
601 | struct rhashtable_params params = { 0 }; |
602 | char *key = NULL; | |
603 | struct aa_data *data; | |
ad5ff3db | 604 | int i, error = -EPROTO; |
736ec752 JJ |
605 | kernel_cap_t tmpcap; |
606 | u32 tmp; | |
607 | ||
04dc715e JJ |
608 | *ns_name = NULL; |
609 | ||
736ec752 JJ |
610 | /* check that we have the right struct being passed */ |
611 | if (!unpack_nameX(e, AA_STRUCT, "profile")) | |
612 | goto fail; | |
613 | if (!unpack_str(e, &name, NULL)) | |
614 | goto fail; | |
04dc715e JJ |
615 | if (*name == '\0') |
616 | goto fail; | |
617 | ||
618 | tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len); | |
619 | if (tmpns) { | |
620 | *ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL); | |
2410aa96 JJ |
621 | if (!*ns_name) { |
622 | info = "out of memory"; | |
04dc715e | 623 | goto fail; |
2410aa96 | 624 | } |
04dc715e JJ |
625 | name = tmpname; |
626 | } | |
736ec752 | 627 | |
637f688d | 628 | profile = aa_alloc_profile(name, NULL, GFP_KERNEL); |
736ec752 JJ |
629 | if (!profile) |
630 | return ERR_PTR(-ENOMEM); | |
631 | ||
632 | /* profile renaming is optional */ | |
633 | (void) unpack_str(e, &profile->rename, "rename"); | |
634 | ||
556d0be7 JJ |
635 | /* attachment string is optional */ |
636 | (void) unpack_str(e, &profile->attach, "attach"); | |
637 | ||
736ec752 JJ |
638 | /* xmatch is optional and may be NULL */ |
639 | profile->xmatch = unpack_dfa(e); | |
640 | if (IS_ERR(profile->xmatch)) { | |
641 | error = PTR_ERR(profile->xmatch); | |
642 | profile->xmatch = NULL; | |
2410aa96 | 643 | info = "bad xmatch"; |
736ec752 JJ |
644 | goto fail; |
645 | } | |
646 | /* xmatch_len is not optional if xmatch is set */ | |
647 | if (profile->xmatch) { | |
2410aa96 JJ |
648 | if (!unpack_u32(e, &tmp, NULL)) { |
649 | info = "missing xmatch len"; | |
736ec752 | 650 | goto fail; |
2410aa96 | 651 | } |
736ec752 JJ |
652 | profile->xmatch_len = tmp; |
653 | } | |
654 | ||
72c8a768 JJ |
655 | /* disconnected attachment string is optional */ |
656 | (void) unpack_str(e, &profile->disconnected, "disconnected"); | |
657 | ||
736ec752 | 658 | /* per profile debug flags (complain, audit) */ |
2410aa96 JJ |
659 | if (!unpack_nameX(e, AA_STRUCT, "flags")) { |
660 | info = "profile missing flags"; | |
736ec752 | 661 | goto fail; |
2410aa96 JJ |
662 | } |
663 | info = "failed to unpack profile flags"; | |
736ec752 JJ |
664 | if (!unpack_u32(e, &tmp, NULL)) |
665 | goto fail; | |
03816507 | 666 | if (tmp & PACKED_FLAG_HAT) |
637f688d | 667 | profile->label.flags |= FLAG_HAT; |
736ec752 JJ |
668 | if (!unpack_u32(e, &tmp, NULL)) |
669 | goto fail; | |
5ebfb128 | 670 | if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG)) |
736ec752 | 671 | profile->mode = APPARMOR_COMPLAIN; |
03816507 JJ |
672 | else if (tmp == PACKED_MODE_KILL) |
673 | profile->mode = APPARMOR_KILL; | |
674 | else if (tmp == PACKED_MODE_UNCONFINED) | |
675 | profile->mode = APPARMOR_UNCONFINED; | |
736ec752 JJ |
676 | if (!unpack_u32(e, &tmp, NULL)) |
677 | goto fail; | |
678 | if (tmp) | |
679 | profile->audit = AUDIT_ALL; | |
680 | ||
681 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) | |
682 | goto fail; | |
683 | ||
684 | /* path_flags is optional */ | |
685 | if (unpack_u32(e, &profile->path_flags, "path_flags")) | |
637f688d JJ |
686 | profile->path_flags |= profile->label.flags & |
687 | PATH_MEDIATE_DELETED; | |
736ec752 JJ |
688 | else |
689 | /* set a default value if path_flags field is not present */ | |
637f688d | 690 | profile->path_flags = PATH_MEDIATE_DELETED; |
736ec752 | 691 | |
2410aa96 | 692 | info = "failed to unpack profile capabilities"; |
736ec752 JJ |
693 | if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL)) |
694 | goto fail; | |
695 | if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL)) | |
696 | goto fail; | |
697 | if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL)) | |
698 | goto fail; | |
699 | if (!unpack_u32(e, &tmpcap.cap[0], NULL)) | |
700 | goto fail; | |
701 | ||
2410aa96 | 702 | info = "failed to unpack upper profile capabilities"; |
736ec752 JJ |
703 | if (unpack_nameX(e, AA_STRUCT, "caps64")) { |
704 | /* optional upper half of 64 bit caps */ | |
705 | if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL)) | |
706 | goto fail; | |
707 | if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL)) | |
708 | goto fail; | |
709 | if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL)) | |
710 | goto fail; | |
711 | if (!unpack_u32(e, &(tmpcap.cap[1]), NULL)) | |
712 | goto fail; | |
713 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) | |
714 | goto fail; | |
715 | } | |
716 | ||
2410aa96 | 717 | info = "failed to unpack extended profile capabilities"; |
736ec752 JJ |
718 | if (unpack_nameX(e, AA_STRUCT, "capsx")) { |
719 | /* optional extended caps mediation mask */ | |
720 | if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL)) | |
721 | goto fail; | |
722 | if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL)) | |
723 | goto fail; | |
cdbd2884 JJ |
724 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) |
725 | goto fail; | |
736ec752 JJ |
726 | } |
727 | ||
2410aa96 JJ |
728 | if (!unpack_rlimits(e, profile)) { |
729 | info = "failed to unpack profile rlimits"; | |
736ec752 | 730 | goto fail; |
2410aa96 | 731 | } |
736ec752 | 732 | |
5c3f5639 JJ |
733 | size = unpack_array(e, "net_allowed_af"); |
734 | if (size) { | |
735 | ||
736 | for (i = 0; i < size; i++) { | |
737 | /* discard extraneous rules that this kernel will | |
738 | * never request | |
739 | */ | |
740 | if (i >= AF_MAX) { | |
741 | u16 tmp; | |
742 | ||
743 | if (!unpack_u16(e, &tmp, NULL) || | |
744 | !unpack_u16(e, &tmp, NULL) || | |
745 | !unpack_u16(e, &tmp, NULL)) | |
746 | goto fail; | |
747 | continue; | |
748 | } | |
749 | if (!unpack_u16(e, &profile->net.allow[i], NULL)) | |
750 | goto fail; | |
751 | if (!unpack_u16(e, &profile->net.audit[i], NULL)) | |
752 | goto fail; | |
753 | if (!unpack_u16(e, &profile->net.quiet[i], NULL)) | |
754 | goto fail; | |
755 | } | |
756 | if (!unpack_nameX(e, AA_ARRAYEND, NULL)) | |
757 | goto fail; | |
758 | } | |
759 | if (VERSION_LT(e->version, v7)) { | |
760 | /* pre v7 policy always allowed these */ | |
761 | profile->net.allow[AF_UNIX] = 0xffff; | |
762 | profile->net.allow[AF_NETLINK] = 0xffff; | |
763 | } | |
764 | ||
ad5ff3db JJ |
765 | if (unpack_nameX(e, AA_STRUCT, "policydb")) { |
766 | /* generic policy dfa - optional and may be NULL */ | |
2410aa96 | 767 | info = "failed to unpack policydb"; |
ad5ff3db JJ |
768 | profile->policy.dfa = unpack_dfa(e); |
769 | if (IS_ERR(profile->policy.dfa)) { | |
770 | error = PTR_ERR(profile->policy.dfa); | |
771 | profile->policy.dfa = NULL; | |
772 | goto fail; | |
5f20fdfe JJ |
773 | } else if (!profile->policy.dfa) { |
774 | error = -EPROTO; | |
775 | goto fail; | |
ad5ff3db JJ |
776 | } |
777 | if (!unpack_u32(e, &profile->policy.start[0], "start")) | |
778 | /* default start state */ | |
779 | profile->policy.start[0] = DFA_START; | |
780 | /* setup class index */ | |
781 | for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) { | |
782 | profile->policy.start[i] = | |
783 | aa_dfa_next(profile->policy.dfa, | |
784 | profile->policy.start[0], | |
785 | i); | |
786 | } | |
787 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) | |
788 | goto fail; | |
11c236b8 JJ |
789 | } else |
790 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
ad5ff3db | 791 | |
736ec752 JJ |
792 | /* get file rules */ |
793 | profile->file.dfa = unpack_dfa(e); | |
794 | if (IS_ERR(profile->file.dfa)) { | |
795 | error = PTR_ERR(profile->file.dfa); | |
796 | profile->file.dfa = NULL; | |
2410aa96 | 797 | info = "failed to unpack profile file rules"; |
736ec752 | 798 | goto fail; |
6604d4c1 JJ |
799 | } else if (profile->file.dfa) { |
800 | if (!unpack_u32(e, &profile->file.start, "dfa_start")) | |
801 | /* default start state */ | |
802 | profile->file.start = DFA_START; | |
803 | } else if (profile->policy.dfa && | |
804 | profile->policy.start[AA_CLASS_FILE]) { | |
805 | profile->file.dfa = aa_get_dfa(profile->policy.dfa); | |
806 | profile->file.start = profile->policy.start[AA_CLASS_FILE]; | |
11c236b8 JJ |
807 | } else |
808 | profile->file.dfa = aa_get_dfa(nulldfa); | |
736ec752 | 809 | |
2410aa96 JJ |
810 | if (!unpack_trans_table(e, profile)) { |
811 | info = "failed to unpack profile transition table"; | |
736ec752 | 812 | goto fail; |
2410aa96 | 813 | } |
736ec752 | 814 | |
e025be0f | 815 | if (unpack_nameX(e, AA_STRUCT, "data")) { |
2410aa96 | 816 | info = "out of memory"; |
e025be0f WH |
817 | profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL); |
818 | if (!profile->data) | |
819 | goto fail; | |
820 | ||
821 | params.nelem_hint = 3; | |
822 | params.key_len = sizeof(void *); | |
823 | params.key_offset = offsetof(struct aa_data, key); | |
824 | params.head_offset = offsetof(struct aa_data, head); | |
825 | params.hashfn = strhash; | |
826 | params.obj_cmpfn = datacmp; | |
827 | ||
2410aa96 JJ |
828 | if (rhashtable_init(profile->data, ¶ms)) { |
829 | info = "failed to init key, value hash table"; | |
e025be0f | 830 | goto fail; |
2410aa96 | 831 | } |
e025be0f WH |
832 | |
833 | while (unpack_strdup(e, &key, NULL)) { | |
834 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
835 | if (!data) { | |
836 | kzfree(key); | |
837 | goto fail; | |
838 | } | |
839 | ||
840 | data->key = key; | |
841 | data->size = unpack_blob(e, &data->data, NULL); | |
842 | data->data = kvmemdup(data->data, data->size); | |
843 | if (data->size && !data->data) { | |
844 | kzfree(data->key); | |
845 | kzfree(data); | |
846 | goto fail; | |
847 | } | |
848 | ||
849 | rhashtable_insert_fast(profile->data, &data->head, | |
850 | profile->data->p); | |
851 | } | |
852 | ||
2410aa96 JJ |
853 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) { |
854 | info = "failed to unpack end of key, value data table"; | |
e025be0f | 855 | goto fail; |
2410aa96 | 856 | } |
e025be0f WH |
857 | } |
858 | ||
2410aa96 JJ |
859 | if (!unpack_nameX(e, AA_STRUCTEND, NULL)) { |
860 | info = "failed to unpack end of profile"; | |
736ec752 | 861 | goto fail; |
2410aa96 | 862 | } |
736ec752 JJ |
863 | |
864 | return profile; | |
865 | ||
866 | fail: | |
867 | if (profile) | |
868 | name = NULL; | |
869 | else if (!name) | |
870 | name = "unknown"; | |
2410aa96 | 871 | audit_iface(profile, NULL, name, info, e, error); |
8651e1d6 | 872 | aa_free_profile(profile); |
736ec752 JJ |
873 | |
874 | return ERR_PTR(error); | |
875 | } | |
876 | ||
877 | /** | |
878 | * verify_head - unpack serialized stream header | |
879 | * @e: serialized data read head (NOT NULL) | |
dd51c848 | 880 | * @required: whether the header is required or optional |
736ec752 JJ |
881 | * @ns: Returns - namespace if one is specified else NULL (NOT NULL) |
882 | * | |
883 | * Returns: error or 0 if header is good | |
884 | */ | |
dd51c848 | 885 | static int verify_header(struct aa_ext *e, int required, const char **ns) |
736ec752 JJ |
886 | { |
887 | int error = -EPROTONOSUPPORT; | |
dd51c848 JJ |
888 | const char *name = NULL; |
889 | *ns = NULL; | |
890 | ||
736ec752 JJ |
891 | /* get the interface version */ |
892 | if (!unpack_u32(e, &e->version, "version")) { | |
dd51c848 | 893 | if (required) { |
04dc715e | 894 | audit_iface(NULL, NULL, NULL, "invalid profile format", |
dd51c848 JJ |
895 | e, error); |
896 | return error; | |
897 | } | |
736ec752 JJ |
898 | } |
899 | ||
474d6b75 JJ |
900 | /* Check that the interface version is currently supported. |
901 | * if not specified use previous version | |
902 | * Mask off everything that is not kernel abi version | |
903 | */ | |
86aea56f | 904 | if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) { |
04dc715e | 905 | audit_iface(NULL, NULL, NULL, "unsupported interface version", |
474d6b75 JJ |
906 | e, error); |
907 | return error; | |
908 | } | |
dd51c848 | 909 | |
736ec752 | 910 | /* read the namespace if present */ |
dd51c848 | 911 | if (unpack_str(e, &name, "namespace")) { |
04dc715e JJ |
912 | if (*name == '\0') { |
913 | audit_iface(NULL, NULL, NULL, "invalid namespace name", | |
914 | e, error); | |
915 | return error; | |
916 | } | |
dd51c848 | 917 | if (*ns && strcmp(*ns, name)) |
04dc715e JJ |
918 | audit_iface(NULL, NULL, NULL, "invalid ns change", e, |
919 | error); | |
dd51c848 JJ |
920 | else if (!*ns) |
921 | *ns = name; | |
922 | } | |
736ec752 JJ |
923 | |
924 | return 0; | |
925 | } | |
926 | ||
927 | static bool verify_xindex(int xindex, int table_size) | |
928 | { | |
929 | int index, xtype; | |
930 | xtype = xindex & AA_X_TYPE_MASK; | |
931 | index = xindex & AA_X_INDEX_MASK; | |
23ca7b64 | 932 | if (xtype == AA_X_TABLE && index >= table_size) |
736ec752 JJ |
933 | return 0; |
934 | return 1; | |
935 | } | |
936 | ||
937 | /* verify dfa xindexes are in range of transition tables */ | |
938 | static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size) | |
939 | { | |
940 | int i; | |
941 | for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) { | |
942 | if (!verify_xindex(dfa_user_xindex(dfa, i), table_size)) | |
943 | return 0; | |
944 | if (!verify_xindex(dfa_other_xindex(dfa, i), table_size)) | |
945 | return 0; | |
946 | } | |
947 | return 1; | |
948 | } | |
949 | ||
950 | /** | |
951 | * verify_profile - Do post unpack analysis to verify profile consistency | |
952 | * @profile: profile to verify (NOT NULL) | |
953 | * | |
954 | * Returns: 0 if passes verification else error | |
955 | */ | |
956 | static int verify_profile(struct aa_profile *profile) | |
957 | { | |
abbf8734 JJ |
958 | if (profile->file.dfa && |
959 | !verify_dfa_xindex(profile->file.dfa, | |
960 | profile->file.trans.size)) { | |
04dc715e | 961 | audit_iface(profile, NULL, NULL, "Invalid named transition", |
abbf8734 JJ |
962 | NULL, -EPROTO); |
963 | return -EPROTO; | |
736ec752 JJ |
964 | } |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
dd51c848 JJ |
969 | void aa_load_ent_free(struct aa_load_ent *ent) |
970 | { | |
971 | if (ent) { | |
972 | aa_put_profile(ent->rename); | |
973 | aa_put_profile(ent->old); | |
974 | aa_put_profile(ent->new); | |
04dc715e | 975 | kfree(ent->ns_name); |
dd51c848 JJ |
976 | kzfree(ent); |
977 | } | |
978 | } | |
979 | ||
980 | struct aa_load_ent *aa_load_ent_alloc(void) | |
981 | { | |
982 | struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL); | |
983 | if (ent) | |
984 | INIT_LIST_HEAD(&ent->list); | |
985 | return ent; | |
986 | } | |
987 | ||
736ec752 | 988 | /** |
dd51c848 | 989 | * aa_unpack - unpack packed binary profile(s) data loaded from user space |
736ec752 | 990 | * @udata: user data copied to kmem (NOT NULL) |
dd51c848 | 991 | * @lh: list to place unpacked profiles in a aa_repl_ws |
736ec752 JJ |
992 | * @ns: Returns namespace profile is in if specified else NULL (NOT NULL) |
993 | * | |
dd51c848 JJ |
994 | * Unpack user data and return refcounted allocated profile(s) stored in |
995 | * @lh in order of discovery, with the list chain stored in base.list | |
996 | * or error | |
736ec752 | 997 | * |
dd51c848 | 998 | * Returns: profile(s) on @lh else error pointer if fails to unpack |
736ec752 | 999 | */ |
5ac8c355 JJ |
1000 | int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, |
1001 | const char **ns) | |
736ec752 | 1002 | { |
dd51c848 | 1003 | struct aa_load_ent *tmp, *ent; |
736ec752 JJ |
1004 | struct aa_profile *profile = NULL; |
1005 | int error; | |
1006 | struct aa_ext e = { | |
5ac8c355 JJ |
1007 | .start = udata->data, |
1008 | .end = udata->data + udata->size, | |
1009 | .pos = udata->data, | |
736ec752 JJ |
1010 | }; |
1011 | ||
dd51c848 JJ |
1012 | *ns = NULL; |
1013 | while (e.pos < e.end) { | |
04dc715e | 1014 | char *ns_name = NULL; |
f8eb8a13 | 1015 | void *start; |
dd51c848 JJ |
1016 | error = verify_header(&e, e.pos == e.start, ns); |
1017 | if (error) | |
1018 | goto fail; | |
736ec752 | 1019 | |
f8eb8a13 | 1020 | start = e.pos; |
04dc715e | 1021 | profile = unpack_profile(&e, &ns_name); |
dd51c848 JJ |
1022 | if (IS_ERR(profile)) { |
1023 | error = PTR_ERR(profile); | |
1024 | goto fail; | |
1025 | } | |
1026 | ||
1027 | error = verify_profile(profile); | |
f8eb8a13 JJ |
1028 | if (error) |
1029 | goto fail_profile; | |
1030 | ||
31f75bfe JJ |
1031 | if (aa_g_hash_policy) |
1032 | error = aa_calc_profile_hash(profile, e.version, start, | |
6059f71f | 1033 | e.pos - start); |
f8eb8a13 JJ |
1034 | if (error) |
1035 | goto fail_profile; | |
dd51c848 JJ |
1036 | |
1037 | ent = aa_load_ent_alloc(); | |
1038 | if (!ent) { | |
1039 | error = -ENOMEM; | |
f8eb8a13 | 1040 | goto fail_profile; |
dd51c848 | 1041 | } |
736ec752 | 1042 | |
dd51c848 | 1043 | ent->new = profile; |
04dc715e | 1044 | ent->ns_name = ns_name; |
dd51c848 | 1045 | list_add_tail(&ent->list, lh); |
736ec752 | 1046 | } |
5ac8c355 | 1047 | udata->abi = e.version & K_ABI_MASK; |
31f75bfe JJ |
1048 | if (aa_g_hash_policy) { |
1049 | udata->hash = aa_calc_hash(udata->data, udata->size); | |
1050 | if (IS_ERR(udata->hash)) { | |
1051 | error = PTR_ERR(udata->hash); | |
1052 | udata->hash = NULL; | |
1053 | goto fail; | |
1054 | } | |
5ac8c355 | 1055 | } |
dd51c848 JJ |
1056 | return 0; |
1057 | ||
f8eb8a13 JJ |
1058 | fail_profile: |
1059 | aa_put_profile(profile); | |
1060 | ||
dd51c848 JJ |
1061 | fail: |
1062 | list_for_each_entry_safe(ent, tmp, lh, list) { | |
1063 | list_del_init(&ent->list); | |
1064 | aa_load_ent_free(ent); | |
1065 | } | |
1066 | ||
1067 | return error; | |
736ec752 | 1068 | } |