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cca7148b SP |
1 | /* |
2 | * Copyright (c) 1999-2004 | |
3 | * Stelian Pop <stelian@popies.net>, 1999-2004 | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. Neither the name of the University nor the names of its contributors | |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #ifndef lint | |
31 | static const char rcsid[] = | |
15508d36 | 32 | "$Id: xattr.c,v 1.6 2010/03/08 10:40:52 stelian Exp $"; |
cca7148b SP |
33 | #endif /* not lint */ |
34 | ||
35 | #include <config.h> | |
36 | #include <compatlfs.h> | |
37 | #include <compaterr.h> | |
38 | #include <sys/types.h> | |
39 | #include <stdio.h> | |
40 | #include <stdlib.h> | |
41 | #include <string.h> | |
42 | #include <unistd.h> | |
43 | #include <errno.h> | |
44 | #include <bsdcompat.h> | |
45 | #include <protocols/dumprestore.h> | |
7f7d329e SP |
46 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ |
47 | # include <selinux/selinux.h> | |
48 | #endif | |
cca7148b SP |
49 | #include "restore.h" |
50 | #include "extern.h" | |
51 | #include "pathnames.h" | |
52 | ||
53 | /* | |
54 | * Data structures below taken from the kernel | |
55 | */ | |
56 | ||
57 | /* Maximum number of references to one attribute block */ | |
58 | #define EXT2_XATTR_REFCOUNT_MAX 1024 | |
59 | ||
60 | /* Name indexes */ | |
61 | #define EXT2_XATTR_INDEX_MAX 10 | |
62 | #define EXT2_XATTR_INDEX_USER 1 | |
63 | #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2 | |
64 | #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3 | |
65 | #define EXT2_XATTR_INDEX_TRUSTED 4 | |
66 | #define EXT2_XATTR_INDEX_LUSTRE 5 | |
67 | #define EXT2_XATTR_INDEX_SECURITY 6 | |
68 | ||
69 | struct ext2_xattr_header { | |
70 | u_int32_t h_magic; /* magic number for identification */ | |
71 | u_int32_t h_refcount; /* reference count */ | |
72 | u_int32_t h_blocks; /* number of disk blocks used */ | |
73 | u_int32_t h_hash; /* hash value of all attributes */ | |
74 | u_int32_t h_reserved[4]; /* zero right now */ | |
75 | }; | |
76 | ||
77 | struct ext3_xattr_ibody_header { | |
78 | u_int32_t h_magic; /* magic number for identification */ | |
79 | }; | |
80 | ||
81 | struct ext2_xattr_entry { | |
82 | u_char e_name_len; /* length of name */ | |
83 | u_char e_name_index; /* attribute name index */ | |
84 | u_int16_t e_value_offs; /* offset in disk block of value */ | |
85 | u_int32_t e_value_block; /* disk block attribute is stored on (n/i) */ | |
86 | u_int32_t e_value_size; /* size of attribute value */ | |
87 | u_int32_t e_hash; /* hash value of name and value */ | |
88 | char e_name[0]; /* attribute name */ | |
89 | }; | |
90 | ||
91 | #define EXT2_XATTR_PAD_BITS 2 | |
92 | #define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS) | |
93 | #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1) | |
94 | #define EXT2_XATTR_LEN(name_len) \ | |
95 | (((name_len) + EXT2_XATTR_ROUND + \ | |
96 | sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND) | |
97 | #define EXT2_XATTR_NEXT(entry) \ | |
98 | ( (struct ext2_xattr_entry *)( \ | |
99 | (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) ) | |
100 | #define EXT3_XATTR_SIZE(size) \ | |
101 | (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND) | |
102 | ||
103 | #define HDR(buffer) ((struct ext2_xattr_header *)(buffer)) | |
104 | #define ENTRY(ptr) ((struct ext2_xattr_entry *)(ptr)) | |
105 | #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) | |
106 | ||
107 | #define BFIRST(buffer) ENTRY(HDR(buffer)+1) | |
108 | #define IFIRST(buffer) ENTRY(((struct ext3_xattr_ibody_header *)(buffer))+1) | |
109 | ||
110 | #define FIRST_ENTRY(buffer) \ | |
111 | ((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \ | |
112 | IFIRST(buffer) : \ | |
113 | BFIRST(buffer)) | |
114 | ||
115 | /* | |
116 | * On-block xattr value offsets start at the beginning of the block, but | |
117 | * on-inode xattr value offsets start after the initial header | |
118 | * (ext3_xattr_ibody_header). | |
119 | */ | |
120 | #define VALUE_OFFSET(buffer, entry) \ | |
121 | (((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \ | |
122 | (entry)->e_value_offs + sizeof(struct ext3_xattr_ibody_header) : \ | |
123 | (entry)->e_value_offs)) | |
124 | ||
125 | /* | |
126 | * xattr syscalls do not exist yet in libc, get our own copy here, | |
127 | * taken from libattr. | |
128 | */ | |
129 | #if defined (__i386__) | |
130 | # define HAVE_XATTR_SYSCALLS 1 | |
131 | # define __NR_lsetxattr 227 | |
132 | # define __NR_lgetxattr 230 | |
133 | # define __NR_llistxattr 233 | |
134 | #elif defined (__sparc__) | |
135 | # define HAVE_XATTR_SYSCALLS 1 | |
136 | # define __NR_lsetxattr 170 | |
137 | # define __NR_lgetxattr 173 | |
138 | # define __NR_llistxattr 179 | |
139 | #elif defined (__ia64__) | |
140 | # define HAVE_XATTR_SYSCALLS 1 | |
141 | # define __NR_lsetxattr 1218 | |
142 | # define __NR_lgetxattr 1221 | |
143 | # define __NR_llistxattr 1224 | |
144 | #elif defined (__powerpc__) | |
145 | # define HAVE_XATTR_SYSCALLS 1 | |
146 | # define __NR_lsetxattr 210 | |
147 | # define __NR_lgetxattr 213 | |
148 | # define __NR_llistxattr 216 | |
149 | #elif defined (__x86_64__) | |
150 | # define HAVE_XATTR_SYSCALLS 1 | |
151 | # define __NR_lsetxattr 189 | |
152 | # define __NR_lgetxattr 192 | |
153 | # define __NR_llistxattr 195 | |
154 | #elif defined (__s390__) | |
155 | # define HAVE_XATTR_SYSCALLS 1 | |
156 | # define __NR_lsetxattr 225 | |
157 | # define __NR_lgetxattr 228 | |
158 | # define __NR_llistxattr 231 | |
159 | #elif defined (__arm__) | |
160 | # define HAVE_XATTR_SYSCALLS 1 | |
161 | # define __NR_SYSCALL_BASE 0x900000 | |
162 | # define __NR_lsetxattr (__NR_SYSCALL_BASE+227) | |
163 | # define __NR_lgetxattr (__NR_SYSCALL_BASE+230) | |
164 | # define __NR_llistxattr (__NR_SYSCALL_BASE+233) | |
165 | #elif defined (__mips64__) | |
166 | # define HAVE_XATTR_SYSCALLS 1 | |
167 | # define __NR_Linux 5000 | |
168 | # define __NR_lsetxattr (__NR_Linux + 218) | |
169 | # define __NR_lgetxattr (__NR_Linux + 221) | |
170 | # define __NR_llistxattr (__NR_Linux + 224) | |
171 | #elif defined (__mips__) | |
172 | # define HAVE_XATTR_SYSCALLS 1 | |
173 | # define __NR_Linux 4000 | |
174 | # define __NR_lsetxattr (__NR_Linux + 225) | |
175 | # define __NR_lgetxattr (__NR_Linux + 228) | |
176 | # define __NR_llistxattr (__NR_Linux + 231) | |
177 | #elif defined (__alpha__) | |
178 | # define HAVE_XATTR_SYSCALLS 1 | |
179 | # define __NR_lsetxattr 383 | |
180 | # define __NR_lgetxattr 386 | |
181 | # define __NR_llistxattr 389 | |
182 | #elif defined (__mc68000__) | |
183 | # define HAVE_XATTR_SYSCALLS 1 | |
184 | # define __NR_lsetxattr 224 | |
185 | # define __NR_lgetxattr 227 | |
186 | # define __NR_llistxattr 230 | |
187 | #else | |
188 | # warning "Extended attribute syscalls undefined for this architecture" | |
189 | # define HAVE_XATTR_SYSCALLS 0 | |
190 | #endif | |
191 | ||
192 | #if HAVE_XATTR_SYSCALLS | |
193 | # define SYSCALL(args...) syscall(args) | |
194 | #else | |
195 | # define SYSCALL(args...) ( errno = ENOSYS, -1 ) | |
196 | #endif | |
197 | ||
198 | static int lsetxattr __P((const char *, const char *, void *, size_t, int)); | |
199 | static ssize_t lgetxattr __P((const char *, const char *, void *, size_t)); | |
200 | static ssize_t llistxattr __P((const char *, char *, size_t)); | |
7f7d329e SP |
201 | static int xattr_cb_list __P((char *, char *, int, int, void *)); |
202 | static int xattr_cb_set __P((char *, char *, int, int, void *)); | |
203 | static int xattr_cb_compare __P((char *, char *, int, int, void *)); | |
cca7148b SP |
204 | static int xattr_verify __P((char *)); |
205 | static int xattr_count __P((char *, int *)); | |
7f7d329e | 206 | static int xattr_walk __P((char *, int (*)(char *, char *, int, int, void *), void *)); |
cca7148b SP |
207 | |
208 | static int | |
209 | lsetxattr(const char *path, const char *name, void *value, size_t size, int flags) | |
210 | { | |
211 | return SYSCALL(__NR_lsetxattr, path, name, value, size, flags); | |
212 | } | |
213 | ||
214 | static ssize_t | |
215 | lgetxattr(const char *path, const char *name, void *value, size_t size) | |
216 | { | |
217 | return SYSCALL(__NR_lgetxattr, path, name, value, size); | |
218 | } | |
219 | ||
220 | static ssize_t | |
221 | llistxattr(const char *path, char *list, size_t size) | |
222 | { | |
223 | return SYSCALL(__NR_llistxattr, path, list, size); | |
224 | } | |
225 | ||
b630baf0 SP |
226 | #define POSIX_ACL_XATTR_VERSION 0x0002 |
227 | ||
228 | #define ACL_UNDEFINED_ID (-1) | |
229 | ||
230 | #define ACL_USER_OBJ (0x01) | |
231 | #define ACL_USER (0x02) | |
232 | #define ACL_GROUP_OBJ (0x04) | |
233 | #define ACL_GROUP (0x08) | |
234 | #define ACL_MASK (0x10) | |
235 | #define ACL_OTHER (0x20) | |
236 | ||
237 | typedef struct { | |
238 | u_int16_t e_tag; | |
239 | u_int16_t e_perm; | |
240 | u_int32_t e_id; | |
241 | } posix_acl_xattr_entry; | |
242 | ||
243 | typedef struct { | |
244 | u_int32_t a_version; | |
245 | posix_acl_xattr_entry a_entries[0]; | |
246 | } posix_acl_xattr_header; | |
247 | ||
248 | static inline size_t | |
249 | posix_acl_xattr_size(int count) | |
250 | { | |
251 | return (sizeof(posix_acl_xattr_header) + | |
252 | (count * sizeof(posix_acl_xattr_entry))); | |
253 | } | |
254 | ||
255 | struct posix_acl_entry { | |
256 | short e_tag; | |
257 | unsigned short e_perm; | |
258 | unsigned int e_id; | |
259 | }; | |
260 | ||
261 | struct posix_acl { | |
262 | unsigned int a_count; | |
263 | struct posix_acl_entry a_entries[0]; | |
264 | }; | |
265 | ||
266 | #define EXT3_ACL_VERSION 0x0001 | |
267 | ||
268 | typedef struct { | |
269 | u_int16_t e_tag; | |
270 | u_int16_t e_perm; | |
271 | u_int32_t e_id; | |
272 | } ext3_acl_entry; | |
273 | ||
274 | typedef struct { | |
275 | u_int16_t e_tag; | |
276 | u_int16_t e_perm; | |
277 | } ext3_acl_entry_short; | |
278 | ||
279 | typedef struct { | |
280 | u_int32_t a_version; | |
281 | } ext3_acl_header; | |
282 | ||
283 | static inline int ext3_acl_count(size_t size) | |
284 | { | |
285 | ssize_t s; | |
286 | size -= sizeof(ext3_acl_header); | |
287 | s = size - 4 * sizeof(ext3_acl_entry_short); | |
288 | if (s < 0) { | |
289 | if (size % sizeof(ext3_acl_entry_short)) | |
290 | return -1; | |
291 | return size / sizeof(ext3_acl_entry_short); | |
292 | } else { | |
293 | if (s % sizeof(ext3_acl_entry)) | |
294 | return -1; | |
295 | return s / sizeof(ext3_acl_entry) + 4; | |
296 | } | |
297 | } | |
298 | ||
299 | int | |
300 | posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size) { | |
301 | posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer; | |
302 | posix_acl_xattr_entry *ext_entry = ext_acl->a_entries; | |
303 | int real_size, n; | |
304 | ||
305 | real_size = posix_acl_xattr_size(acl->a_count); | |
306 | if (!buffer) | |
307 | return real_size; | |
308 | if (real_size > size) { | |
309 | fprintf(stderr, "ACL: not enough space to convert (%d %d)\n", real_size, size); | |
310 | return -1; | |
311 | } | |
312 | ||
313 | ext_acl->a_version = POSIX_ACL_XATTR_VERSION; | |
cb6d3f79 SP |
314 | #if BYTE_ORDER == BIG_ENDIAN |
315 | swabst("1i", (u_char *)ext_acl); | |
316 | #endif | |
b630baf0 SP |
317 | |
318 | for (n=0; n < acl->a_count; n++, ext_entry++) { | |
319 | ext_entry->e_tag = acl->a_entries[n].e_tag; | |
320 | ext_entry->e_perm = acl->a_entries[n].e_perm; | |
321 | ext_entry->e_id = acl->a_entries[n].e_id; | |
cb6d3f79 SP |
322 | #if BYTE_ORDER == BIG_ENDIAN |
323 | swabst("2s1i", (u_char *)ext_entry); | |
324 | #endif | |
b630baf0 SP |
325 | } |
326 | return real_size; | |
327 | } | |
328 | ||
329 | static struct posix_acl * | |
330 | ext3_acl_from_disk(const void *value, size_t size) | |
331 | { | |
332 | const char *end = (char *)value + size; | |
333 | int n, count; | |
334 | struct posix_acl *acl; | |
335 | ||
336 | if (!value) | |
337 | return NULL; | |
338 | if (size < sizeof(ext3_acl_header)) { | |
339 | fprintf(stderr, "ACL size too little\n"); | |
340 | return NULL; | |
341 | } | |
cb6d3f79 SP |
342 | #if BYTE_ORDER == BIG_ENDIAN |
343 | swabst("1i", (u_char *)value); | |
344 | #endif | |
b630baf0 SP |
345 | if (((ext3_acl_header *)value)->a_version != EXT3_ACL_VERSION) { |
346 | fprintf(stderr, "ACL version unknown\n"); | |
347 | return NULL; | |
348 | } | |
349 | value = (char *)value + sizeof(ext3_acl_header); | |
350 | count = ext3_acl_count(size); | |
351 | if (count < 0) { | |
352 | fprintf(stderr, "ACL bad count\n"); | |
353 | return NULL; | |
354 | } | |
355 | if (count == 0) | |
356 | return NULL; | |
357 | acl = malloc(sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry)); | |
358 | if (!acl) { | |
359 | fprintf(stderr, "ACL malloc failed\n"); | |
360 | return NULL; | |
361 | } | |
362 | acl->a_count = count; | |
363 | ||
364 | for (n=0; n < count; n++) { | |
b630baf0 | 365 | ext3_acl_entry *entry = (ext3_acl_entry *)value; |
cb6d3f79 SP |
366 | #if BYTE_ORDER == BIG_ENDIAN |
367 | swabst("2s", (u_char *)entry); | |
368 | #endif | |
b630baf0 SP |
369 | if ((char *)value + sizeof(ext3_acl_entry_short) > end) |
370 | goto fail; | |
371 | acl->a_entries[n].e_tag = entry->e_tag; | |
372 | acl->a_entries[n].e_perm = entry->e_perm; | |
373 | switch(acl->a_entries[n].e_tag) { | |
374 | case ACL_USER_OBJ: | |
375 | case ACL_GROUP_OBJ: | |
376 | case ACL_MASK: | |
377 | case ACL_OTHER: | |
378 | value = (char *)value + sizeof(ext3_acl_entry_short); | |
379 | acl->a_entries[n].e_id = ACL_UNDEFINED_ID; | |
380 | break; | |
381 | ||
382 | case ACL_USER: | |
383 | case ACL_GROUP: | |
cb6d3f79 SP |
384 | #if BYTE_ORDER == BIG_ENDIAN |
385 | swabst("4b1i", (u_char *)entry); | |
386 | #endif | |
b630baf0 SP |
387 | value = (char *)value + sizeof(ext3_acl_entry); |
388 | if ((char *)value > end) | |
389 | goto fail; | |
390 | acl->a_entries[n].e_id = entry->e_id; | |
391 | break; | |
392 | ||
393 | default: | |
394 | goto fail; | |
395 | } | |
396 | } | |
397 | if (value != end) | |
398 | goto fail; | |
399 | return acl; | |
400 | ||
401 | fail: | |
402 | fprintf(stderr, "ACL bad entry\n"); | |
403 | free(acl); | |
404 | return NULL; | |
405 | } | |
406 | ||
cca7148b SP |
407 | /* |
408 | * Dump code starts here :) | |
409 | */ | |
410 | ||
411 | static int | |
7f7d329e | 412 | xattr_cb_list(char *name, char *value, int valuelen, int isSELinux, void *private) |
cca7148b | 413 | { |
7f7d329e | 414 | isSELinux; |
cca7148b SP |
415 | value[valuelen] = '\0'; |
416 | printf("EA: %s:%s\n", name, value); | |
417 | ||
418 | return GOOD; | |
419 | } | |
420 | ||
421 | static int | |
7f7d329e | 422 | xattr_cb_set(char *name, char *value, int valuelen, int isSELinux, void *private) |
cca7148b SP |
423 | { |
424 | char *path = (char *)private; | |
7f7d329e | 425 | int err; |
15508d36 SP |
426 | |
427 | if (Nflag) | |
428 | return GOOD; | |
429 | ||
7f7d329e SP |
430 | isSELinux; |
431 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ | |
432 | if (isSELinux) | |
433 | err = lsetfilecon(path, value); | |
434 | else | |
435 | #endif | |
436 | err = lsetxattr(path, name, value, valuelen, 0); | |
437 | ||
438 | if (err) { | |
439 | warn("%s: EA set %s:%s failed", path, name, value); | |
cca7148b SP |
440 | return FAIL; |
441 | } | |
7f7d329e | 442 | |
cca7148b SP |
443 | return GOOD; |
444 | } | |
445 | ||
446 | static int | |
7f7d329e | 447 | xattr_cb_compare(char *name, char *value, int valuelen, int isSELinux, void *private) |
cca7148b SP |
448 | { |
449 | char *path = (char *)private; | |
450 | char valuef[XATTR_MAXSIZE]; | |
451 | int valuesz; | |
7f7d329e SP |
452 | |
453 | isSELinux; | |
454 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ | |
455 | if (isSELinux) | |
456 | { | |
457 | security_context_t con = NULL; | |
458 | ||
459 | if (lgetfilecon(path, &con) < 0) { | |
460 | warn("%s: EA compare lgetfilecon failed\n", path); | |
461 | return FAIL; | |
462 | } | |
463 | ||
464 | valuesz = strlen(con) + 1; | |
465 | valuef[0] = 0; | |
466 | strncat(valuef, con, sizeof valuef); | |
467 | freecon(con); | |
cca7148b | 468 | } |
7f7d329e SP |
469 | else { |
470 | #endif | |
471 | valuesz = lgetxattr(path, name, valuef, XATTR_MAXSIZE); | |
472 | if (valuesz < 0) { | |
473 | warn("%s: EA compare lgetxattr failed\n", path); | |
474 | return FAIL; | |
475 | } | |
476 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ | |
cca7148b | 477 | } |
7f7d329e SP |
478 | #endif |
479 | ||
480 | if (valuesz != valuelen || memcmp(value, valuef, valuelen)) { | |
481 | /* GAN24May06: show name and new value for user to compare */ | |
482 | fprintf(stderr, "%s: EA %s:%s value changed to %s\n", path, name, value, valuef); | |
cca7148b SP |
483 | return FAIL; |
484 | } | |
485 | ||
486 | return GOOD; | |
487 | } | |
488 | ||
489 | static int | |
490 | xattr_verify(char *buffer) | |
491 | { | |
492 | struct ext2_xattr_entry *entry; | |
493 | char *end; | |
494 | ||
495 | end = buffer + XATTR_MAXSIZE; | |
496 | ||
cb6d3f79 SP |
497 | #if BYTE_ORDER == BIG_ENDIAN |
498 | swabst("4i", (u_char *)buffer); | |
499 | #endif | |
cca7148b SP |
500 | |
501 | if (HDR(buffer)->h_magic != EXT2_XATTR_MAGIC && | |
502 | HDR(buffer)->h_magic != EXT2_XATTR_MAGIC2) { | |
503 | fprintf(stderr, "error in EA block 1\n"); | |
504 | fprintf(stderr, "magic = %x\n", HDR(buffer)->h_magic); | |
505 | ||
506 | return FAIL; | |
507 | } | |
508 | ||
509 | /* check the on-disk data structure */ | |
510 | entry = FIRST_ENTRY(buffer); | |
cb6d3f79 SP |
511 | #if BYTE_ORDER == BIG_ENDIAN |
512 | swabst("2b1s3i", (u_char *)entry); | |
513 | #endif | |
cca7148b SP |
514 | while (!IS_LAST_ENTRY(entry)) { |
515 | struct ext2_xattr_entry *next = EXT2_XATTR_NEXT(entry); | |
516 | ||
517 | if ((char *)next >= end) { | |
518 | fprintf(stderr, "error in EA block\n"); | |
519 | return FAIL; | |
520 | } | |
521 | entry = next; | |
cb6d3f79 SP |
522 | #if BYTE_ORDER == BIG_ENDIAN |
523 | swabst("2b1s3i", (u_char *)entry); | |
524 | #endif | |
cca7148b SP |
525 | } |
526 | return GOOD; | |
527 | } | |
528 | ||
529 | static int | |
530 | xattr_count(char *buffer, int *count) | |
531 | { | |
532 | struct ext2_xattr_entry *entry; | |
533 | int result = 0; | |
534 | ||
535 | /* list the attribute names */ | |
536 | for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry); | |
537 | entry = EXT2_XATTR_NEXT(entry)) | |
538 | result++; | |
539 | ||
540 | *count = result; | |
541 | return GOOD; | |
542 | } | |
543 | ||
544 | static int | |
7f7d329e | 545 | xattr_walk(char *buffer, int (*xattr_cb)(char *, char *, int, int, void *), void *private) |
cca7148b SP |
546 | { |
547 | struct ext2_xattr_entry *entry; | |
548 | ||
549 | /* list the attribute names */ | |
550 | for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry); | |
551 | entry = EXT2_XATTR_NEXT(entry)) { | |
552 | char name[XATTR_MAXSIZE], value[XATTR_MAXSIZE]; | |
11997d3b | 553 | int size; |
cca7148b | 554 | int off; |
b630baf0 | 555 | int convertacl = 0; |
7f7d329e | 556 | int convertcon = 0; |
cca7148b SP |
557 | |
558 | switch (entry->e_name_index) { | |
559 | case EXT2_XATTR_INDEX_USER: | |
560 | strcpy(name, "user."); | |
561 | break; | |
562 | case EXT2_XATTR_INDEX_POSIX_ACL_ACCESS: | |
b630baf0 SP |
563 | strcpy(name, "system.posix_acl_access"); |
564 | convertacl = 1; | |
565 | break; | |
cca7148b | 566 | case EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT: |
b630baf0 SP |
567 | strcpy(name, "system.posix_acl_default"); |
568 | convertacl = 1; | |
cca7148b SP |
569 | break; |
570 | case EXT2_XATTR_INDEX_TRUSTED: | |
571 | strcpy(name, "trusted."); | |
572 | break; | |
573 | case EXT2_XATTR_INDEX_LUSTRE: | |
574 | strcpy(name, "lustre."); | |
575 | break; | |
576 | case EXT2_XATTR_INDEX_SECURITY: | |
577 | strcpy(name, "security."); | |
7f7d329e SP |
578 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ |
579 | convertcon = transselinuxflag; | |
580 | #endif | |
cca7148b SP |
581 | break; |
582 | default: | |
583 | fprintf(stderr, "Unknown EA index\n"); | |
584 | return FAIL; | |
585 | } | |
586 | ||
587 | off = strlen(name); | |
588 | memcpy(name + off, entry->e_name, entry->e_name_len); | |
589 | name[off + entry->e_name_len] = '\0'; | |
11997d3b | 590 | size = entry->e_value_size; |
cca7148b | 591 | |
11997d3b | 592 | memcpy(value, buffer + VALUE_OFFSET(buffer, entry), size); |
cca7148b | 593 | |
b630baf0 SP |
594 | if (convertacl) { |
595 | struct posix_acl *acl; | |
b630baf0 | 596 | |
11997d3b | 597 | acl = ext3_acl_from_disk(value, size); |
b630baf0 SP |
598 | if (!acl) |
599 | return FAIL; | |
600 | size = posix_acl_to_xattr(acl, value, XATTR_MAXSIZE); | |
601 | if (size < 0) | |
602 | return FAIL; | |
b630baf0 SP |
603 | free(acl); |
604 | } | |
7f7d329e SP |
605 | |
606 | #ifdef TRANSSELINUX /*GAN6May06 SELinux MLS */ | |
607 | if (convertcon && strcmp(name, "security.selinux")) | |
608 | convertcon = 0; /*GAN24May06 only for selinux */ | |
609 | ||
610 | if (convertcon) | |
611 | { | |
612 | security_context_t con = NULL; | |
613 | int err; | |
614 | ||
615 | if (!transselinuxarg) | |
616 | err = security_canonicalize_context(value, &con); | |
617 | else { | |
618 | strncat(value, transselinuxarg, sizeof value); | |
619 | err = security_canonicalize_context_raw(value, &con); | |
620 | } | |
621 | ||
622 | if (err < 0) { | |
623 | warn("%s: EA canonicalize failed\n", value); | |
624 | return FAIL; | |
625 | } | |
626 | ||
11997d3b | 627 | size = strlen(con) + 1; |
7f7d329e SP |
628 | value[0] = 0; |
629 | strncat(value, con, sizeof value); | |
630 | freecon(con); | |
631 | } | |
632 | #endif | |
b630baf0 | 633 | |
11997d3b | 634 | if (xattr_cb(name, value, size, convertcon, private) != GOOD) |
cca7148b SP |
635 | return FAIL; |
636 | } | |
637 | ||
638 | return GOOD; | |
639 | } | |
640 | ||
641 | int | |
642 | xattr_compare(char *path, char *buffer) | |
643 | { | |
644 | int countf, countt; | |
645 | char *names = NULL, *end_names, *name; | |
646 | ||
647 | countf = llistxattr(path, NULL, 0); | |
648 | if (countf < 0) { | |
649 | warn("%s: llistxattr failed", path); | |
650 | return FAIL; | |
651 | } | |
652 | ||
653 | names = malloc(countf + 1); | |
654 | if (!names) { | |
655 | warn("%s: llistxattr failed", path); | |
656 | return FAIL; | |
657 | } | |
658 | ||
659 | countf = llistxattr(path, names, countf); | |
660 | if (countf < 0) { | |
661 | warn("%s: llistxattr failed", path); | |
662 | free(names); | |
663 | return FAIL; | |
664 | } | |
665 | ||
666 | names[countf] = '\0'; | |
667 | end_names = names + countf; | |
668 | ||
669 | countf = 0; | |
670 | for (name = names; name != end_names; name = strchr(name, '\0') + 1) { | |
671 | if (!*name) | |
672 | continue; | |
673 | countf++; | |
674 | } | |
675 | ||
676 | free(names); | |
677 | ||
678 | if (buffer) { | |
679 | if (xattr_verify(buffer) == FAIL) | |
680 | return FAIL; | |
681 | ||
682 | if (xattr_count(buffer, &countt) == FAIL) | |
683 | return FAIL; | |
684 | } | |
685 | else | |
686 | countt = 0; | |
687 | ||
688 | if (countf != countt) { | |
689 | fprintf(stderr, "%s: EA count changed from %d to %d\n", path, countt, countf); | |
690 | return FAIL; | |
691 | } | |
692 | ||
693 | if (!buffer) | |
694 | return GOOD; | |
695 | ||
696 | return xattr_walk(buffer, xattr_cb_compare, path); | |
697 | } | |
698 | ||
699 | int | |
700 | xattr_extract(char *path, char *buffer) | |
701 | { | |
702 | if (dflag) { | |
703 | fprintf(stderr, "xattr_extract(%s)\n", path); | |
704 | xattr_walk(buffer, xattr_cb_list, NULL); | |
705 | } | |
706 | ||
707 | if (xattr_verify(buffer) == FAIL) | |
708 | return FAIL; | |
709 | ||
710 | return xattr_walk(buffer, xattr_cb_set, path); | |
711 | } | |
712 |