xref: /titanic_50/usr/src/cmd/svc/common/manifest_hash.c (revision 694c35faa87b858ecdadfe4fc592615f4eefbb07)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
23  */
24 
25 
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 
29 #include <assert.h>
30 #include <ctype.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <libintl.h>
34 #include <libscf.h>
35 #include <libuutil.h>
36 #include <limits.h>
37 #include <md5.h>
38 #include <pthread.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <strings.h>
43 #include <unistd.h>
44 
45 #include <manifest_hash.h>
46 
47 /*
48  * Translate a file name to property name.  Return an allocated string or NULL
49  * if realpath() fails. If deathrow is true, realpath() is skipped. This
50  * allows to return the property name even if the file doesn't exist.
51  */
52 char *
53 mhash_filename_to_propname(const char *in, boolean_t deathrow)
54 {
55 	char *out, *cp, *base;
56 	size_t len, piece_len;
57 	size_t base_sz = 0;
58 
59 	out = uu_zalloc(PATH_MAX + 1);
60 	if (deathrow) {
61 		/* used only for service deathrow handling */
62 		if (strlcpy(out, in, PATH_MAX + 1) >= (PATH_MAX + 1)) {
63 			uu_free(out);
64 			return (NULL);
65 		}
66 	} else {
67 		if (realpath(in, out) == NULL) {
68 			uu_free(out);
69 			return (NULL);
70 		}
71 	}
72 
73 	base = getenv("PKG_INSTALL_ROOT");
74 
75 	/*
76 	 * We copy-shift over the basedir and the leading slash, since it's
77 	 * not relevant to when we boot with this repository.
78 	 */
79 
80 	if (base != NULL && strncmp(out, base, strlen(base)) == 0)
81 		base_sz = strlen(base);
82 
83 	cp = out + base_sz;
84 	if (*cp == '/')
85 		cp++;
86 	(void) memmove(out, cp, strlen(cp) + 1);
87 
88 	len = strlen(out);
89 	if (len > scf_limit(SCF_LIMIT_MAX_NAME_LENGTH)) {
90 		/* Use the first half and the second half. */
91 		piece_len = (scf_limit(SCF_LIMIT_MAX_NAME_LENGTH) - 3) / 2;
92 
93 		(void) strncpy(out + piece_len, "__", 2);
94 
95 		(void) memmove(out + piece_len + 2, out + (len - piece_len),
96 		    piece_len + 1);
97 	}
98 
99 	/*
100 	 * Translate non-property characters to '_', first making sure that
101 	 * we don't begin with '_'.
102 	 */
103 
104 	if (!isalpha(*out))
105 		*out = 'A';
106 
107 	for (cp = out + 1; *cp != '\0'; ++cp) {
108 		if (!(isalnum(*cp) || *cp == '_' || *cp == '-'))
109 			*cp = '_';
110 	}
111 
112 	return (out);
113 }
114 
115 int
116 mhash_retrieve_entry(scf_handle_t *hndl, const char *name, uchar_t *hash,
117     apply_action_t *action)
118 {
119 	scf_scope_t *scope;
120 	scf_service_t *svc;
121 	scf_propertygroup_t *pg;
122 	scf_property_t *prop;
123 	scf_value_t *val;
124 	scf_error_t err;
125 	ssize_t szret;
126 	int result = 0;
127 
128 	if (action)
129 		*action = APPLY_NONE;
130 
131 	/*
132 	 * In this implementation the hash for name is the opaque value of
133 	 * svc:/MHASH_SVC/:properties/name/MHASH_PROP
134 	 */
135 
136 	if ((scope = scf_scope_create(hndl)) == NULL ||
137 	    (svc = scf_service_create(hndl)) == NULL ||
138 	    (pg = scf_pg_create(hndl)) == NULL ||
139 	    (prop = scf_property_create(hndl)) == NULL ||
140 	    (val = scf_value_create(hndl)) == NULL) {
141 		result = -1;
142 		goto out;
143 	}
144 
145 	if (scf_handle_get_local_scope(hndl, scope) < 0) {
146 		result = -1;
147 		goto out;
148 	}
149 
150 	if (scf_scope_get_service(scope, MHASH_SVC, svc) < 0) {
151 		result = -1;
152 		goto out;
153 	}
154 
155 	if (scf_service_get_pg(svc, name, pg) != SCF_SUCCESS) {
156 		result = -1;
157 		goto out;
158 	}
159 
160 	if (scf_pg_get_property(pg, MHASH_PROP, prop) != SCF_SUCCESS) {
161 		result = -1;
162 		goto out;
163 	}
164 
165 	if (scf_property_get_value(prop, val) != SCF_SUCCESS) {
166 		result = -1;
167 		goto out;
168 	}
169 
170 	szret = scf_value_get_opaque(val, hash, MHASH_SIZE);
171 	if (szret < 0) {
172 		result = -1;
173 		goto out;
174 	}
175 
176 	/*
177 	 * Make sure that the old hash is returned with
178 	 * remainder of the bytes zeroed.
179 	 */
180 	if (szret == MHASH_SIZE_OLD) {
181 		(void) memset(hash + MHASH_SIZE_OLD, 0,
182 		    MHASH_SIZE - MHASH_SIZE_OLD);
183 	} else if (szret != MHASH_SIZE) {
184 		scf_value_destroy(val);
185 		result = -1;
186 		goto out;
187 	}
188 
189 	/*
190 	 * If caller has requested the apply_last property, read the
191 	 * property if it exists.
192 	 */
193 	if (action != NULL) {
194 		uint8_t apply_value;
195 
196 		if (scf_pg_get_property(pg, MHASH_APPLY_PROP, prop) !=
197 		    SCF_SUCCESS) {
198 			err = scf_error();
199 			if ((err != SCF_ERROR_DELETED) &&
200 			    (err != SCF_ERROR_NOT_FOUND)) {
201 				result = -1;
202 			}
203 			goto out;
204 		}
205 		if (scf_property_get_value(prop, val) != SCF_SUCCESS) {
206 			err = scf_error();
207 			if ((err != SCF_ERROR_DELETED) &&
208 			    (err != SCF_ERROR_NOT_FOUND)) {
209 				result = -1;
210 			}
211 			goto out;
212 		}
213 		if (scf_value_get_boolean(val, &apply_value) != SCF_SUCCESS) {
214 			result = -1;
215 			goto out;
216 		}
217 		if (apply_value)
218 			*action = APPLY_LATE;
219 	}
220 
221 out:
222 	(void) scf_value_destroy(val);
223 	scf_property_destroy(prop);
224 	scf_pg_destroy(pg);
225 	scf_service_destroy(svc);
226 	scf_scope_destroy(scope);
227 
228 	return (result);
229 }
230 
231 int
232 mhash_store_entry(scf_handle_t *hndl, const char *name, const char *fname,
233     uchar_t *hash, apply_action_t apply_late, char **errstr)
234 {
235 	scf_scope_t *scope = NULL;
236 	scf_service_t *svc = NULL;
237 	scf_propertygroup_t *pg = NULL;
238 	scf_property_t *prop = NULL;
239 	scf_value_t *aval = NULL;
240 	scf_value_t *val = NULL;
241 	scf_value_t *fval = NULL;
242 	scf_transaction_t *tx = NULL;
243 	scf_transaction_entry_t *ae = NULL;
244 	scf_transaction_entry_t *e = NULL;
245 	scf_transaction_entry_t *fe = NULL;
246 	scf_error_t err;
247 	int ret, result = 0;
248 
249 	int i;
250 
251 	if ((scope = scf_scope_create(hndl)) == NULL ||
252 	    (svc = scf_service_create(hndl)) == NULL ||
253 	    (pg = scf_pg_create(hndl)) == NULL ||
254 	    (prop = scf_property_create(hndl)) == NULL) {
255 		if (errstr != NULL)
256 			*errstr = gettext("Could not create scf objects");
257 		result = -1;
258 		goto out;
259 	}
260 
261 	if (scf_handle_get_local_scope(hndl, scope) != SCF_SUCCESS) {
262 		if (errstr != NULL)
263 			*errstr = gettext("Could not get local scope");
264 		result = -1;
265 		goto out;
266 	}
267 
268 	for (i = 0; i < 5; ++i) {
269 
270 		if (scf_scope_get_service(scope, MHASH_SVC, svc) ==
271 		    SCF_SUCCESS)
272 			break;
273 
274 		if (scf_error() != SCF_ERROR_NOT_FOUND) {
275 			if (errstr != NULL)
276 				*errstr = gettext("Could not get manifest hash "
277 				    "service");
278 			result = -1;
279 			goto out;
280 		}
281 
282 		if (scf_scope_add_service(scope, MHASH_SVC, svc) ==
283 		    SCF_SUCCESS)
284 			break;
285 
286 		err = scf_error();
287 
288 		if (err == SCF_ERROR_EXISTS)
289 			/* Try again. */
290 			continue;
291 		else if (err == SCF_ERROR_PERMISSION_DENIED) {
292 			if (errstr != NULL)
293 				*errstr = gettext("Could not store file hash: "
294 				    "permission denied.\n");
295 			result = -1;
296 			goto out;
297 		}
298 
299 		if (errstr != NULL)
300 			*errstr = gettext("Could not add manifest hash "
301 			    "service");
302 		result = -1;
303 		goto out;
304 	}
305 
306 	if (i == 5) {
307 		if (errstr != NULL)
308 			*errstr = gettext("Could not store file hash: "
309 			    "service addition contention.\n");
310 		result = -1;
311 		goto out;
312 	}
313 
314 	for (i = 0; i < 5; ++i) {
315 		if (scf_service_get_pg(svc, name, pg) == SCF_SUCCESS)
316 			break;
317 
318 		if (scf_error() != SCF_ERROR_NOT_FOUND) {
319 			if (errstr != NULL)
320 				*errstr = gettext("Could not get service's "
321 				    "hash record)");
322 			result = -1;
323 			goto out;
324 		}
325 
326 		if (scf_service_add_pg(svc, name, MHASH_PG_TYPE,
327 		    MHASH_PG_FLAGS, pg) == SCF_SUCCESS)
328 			break;
329 
330 		err = scf_error();
331 
332 		if (err == SCF_ERROR_EXISTS)
333 			/* Try again. */
334 			continue;
335 		else if (err == SCF_ERROR_PERMISSION_DENIED) {
336 			if (errstr != NULL)
337 				*errstr = gettext("Could not store file hash: "
338 				    "permission denied.\n");
339 			result = -1;
340 			goto out;
341 		}
342 
343 		if (errstr != NULL)
344 			*errstr = gettext("Could not store file hash");
345 		result = -1;
346 		goto out;
347 	}
348 	if (i == 5) {
349 		if (errstr != NULL)
350 			*errstr = gettext("Could not store file hash: "
351 			    "property group addition contention.\n");
352 		result = -1;
353 		goto out;
354 	}
355 
356 	if ((e = scf_entry_create(hndl)) == NULL ||
357 	    (val = scf_value_create(hndl)) == NULL ||
358 	    (fe = scf_entry_create(hndl)) == NULL ||
359 	    (fval = scf_value_create(hndl)) == NULL ||
360 	    (ae = scf_entry_create(hndl)) == NULL ||
361 	    (aval = scf_value_create(hndl)) == NULL) {
362 		if (errstr != NULL)
363 			*errstr = gettext("Could not store file hash: "
364 			    "permission denied.\n");
365 		result = -1;
366 		goto out;
367 	}
368 
369 	ret = scf_value_set_opaque(val, hash, MHASH_SIZE);
370 	assert(ret == SCF_SUCCESS);
371 	ret = scf_value_set_astring(fval, fname);
372 	assert(ret == SCF_SUCCESS);
373 	if (apply_late == APPLY_LATE) {
374 		scf_value_set_boolean(aval, 1);
375 	}
376 
377 	tx = scf_transaction_create(hndl);
378 	if (tx == NULL) {
379 		if (errstr != NULL)
380 			*errstr = gettext("Could not create transaction");
381 		result = -1;
382 		goto out;
383 	}
384 
385 	do {
386 		if (scf_pg_update(pg) == -1) {
387 			if (errstr != NULL)
388 				*errstr = gettext("Could not update hash "
389 				    "entry");
390 			result = -1;
391 			goto out;
392 		}
393 		if (scf_transaction_start(tx, pg) != SCF_SUCCESS) {
394 			if (scf_error() != SCF_ERROR_PERMISSION_DENIED) {
395 				if (errstr != NULL)
396 					*errstr = gettext("Could not start "
397 					    "hash transaction.\n");
398 				result = -1;
399 				goto out;
400 			}
401 
402 			if (errstr != NULL)
403 				*errstr = gettext("Could not store file hash: "
404 				    "permission denied.\n");
405 			result = -1;
406 
407 			scf_transaction_destroy(tx);
408 			(void) scf_entry_destroy(e);
409 			goto out;
410 		}
411 
412 		if (scf_transaction_property_new(tx, e, MHASH_PROP,
413 		    SCF_TYPE_OPAQUE) != SCF_SUCCESS &&
414 		    scf_transaction_property_change_type(tx, e, MHASH_PROP,
415 		    SCF_TYPE_OPAQUE) != SCF_SUCCESS) {
416 			if (errstr != NULL)
417 				*errstr = gettext("Could not modify hash "
418 				    "entry");
419 			result = -1;
420 			goto out;
421 		}
422 
423 		ret = scf_entry_add_value(e, val);
424 		assert(ret == SCF_SUCCESS);
425 
426 		if (scf_transaction_property_new(tx, fe, MHASH_FILE_PROP,
427 		    SCF_TYPE_ASTRING) != SCF_SUCCESS &&
428 		    scf_transaction_property_change_type(tx, fe,
429 		    MHASH_FILE_PROP, SCF_TYPE_ASTRING) != SCF_SUCCESS) {
430 			if (errstr != NULL)
431 				*errstr = gettext("Could not modify file "
432 				    "entry");
433 			result = -1;
434 			goto out;
435 		}
436 
437 		ret = scf_entry_add_value(fe, fval);
438 		assert(ret == SCF_SUCCESS);
439 
440 		switch (apply_late) {
441 		case APPLY_NONE:
442 			if (scf_transaction_property_delete(tx, ae,
443 			    MHASH_APPLY_PROP) != 0) {
444 				err = scf_error();
445 				if ((err != SCF_ERROR_DELETED) &&
446 				    (err != SCF_ERROR_NOT_FOUND)) {
447 					if (errstr != NULL) {
448 						*errstr = gettext("Could not "
449 						    "delete apply_late "
450 						    "property");
451 					}
452 					result = -1;
453 					goto out;
454 				}
455 			}
456 			break;
457 		case APPLY_LATE:
458 			if ((scf_transaction_property_new(tx, ae,
459 			    MHASH_APPLY_PROP,
460 			    SCF_TYPE_BOOLEAN) != SCF_SUCCESS) &&
461 			    (scf_transaction_property_change_type(tx, ae,
462 			    MHASH_APPLY_PROP, SCF_TYPE_BOOLEAN) !=
463 			    SCF_SUCCESS)) {
464 				if (errstr != NULL) {
465 					*errstr = gettext("Could not modify "
466 					    "apply_late property");
467 				}
468 				result = -1;
469 				goto out;
470 			}
471 
472 			ret = scf_entry_add_value(ae, aval);
473 			assert(ret == SCF_SUCCESS);
474 			break;
475 		default:
476 			abort();
477 		};
478 
479 		ret = scf_transaction_commit(tx);
480 
481 		if (ret == 0)
482 			scf_transaction_reset(tx);
483 	} while (ret == 0);
484 
485 	if (ret < 0) {
486 		if (scf_error() != SCF_ERROR_PERMISSION_DENIED) {
487 			if (errstr != NULL)
488 				*errstr = gettext("Could not store file hash: "
489 				    "permission denied.\n");
490 			result = -1;
491 			goto out;
492 		}
493 
494 		if (errstr != NULL)
495 			*errstr = gettext("Could not commit transaction");
496 		result = -1;
497 	}
498 
499 	scf_transaction_destroy(tx);
500 	(void) scf_entry_destroy(e);
501 	(void) scf_entry_destroy(fe);
502 	(void) scf_entry_destroy(ae);
503 
504 out:
505 	(void) scf_value_destroy(val);
506 	(void) scf_value_destroy(fval);
507 	(void) scf_value_destroy(aval);
508 	scf_property_destroy(prop);
509 	scf_pg_destroy(pg);
510 	scf_service_destroy(svc);
511 	scf_scope_destroy(scope);
512 
513 	return (result);
514 }
515 
516 /*
517  * Generate the md5 hash of a file; manifest files are smallish
518  * so we can read them in one gulp.
519  */
520 static int
521 md5_hash_file(const char *file, off64_t sz, uchar_t *hash)
522 {
523 	char *buf;
524 	int fd;
525 	ssize_t res;
526 	int ret;
527 
528 	fd = open(file, O_RDONLY);
529 	if (fd < 0)
530 		return (-1);
531 
532 	buf = malloc(sz);
533 	if (buf == NULL) {
534 		(void) close(fd);
535 		return (-1);
536 	}
537 
538 	res = read(fd, buf, (size_t)sz);
539 
540 	(void) close(fd);
541 
542 	if (res == sz) {
543 		ret = 0;
544 		md5_calc(hash, (uchar_t *)buf, (unsigned int) sz);
545 	} else {
546 		ret = -1;
547 	}
548 
549 	free(buf);
550 	return (ret);
551 }
552 
553 /*
554  * int mhash_test_file(scf_handle_t *, const char *, uint_t, char **, uchar_t *)
555  *   Test the given filename against the hashed metadata in the repository.
556  *   The behaviours for import and apply are slightly different.  For imports,
557  *   if the hash value is absent or different, then the import operation
558  *   continues.  For profile application, the operation continues only if the
559  *   hash value for the file is absent.
560  *
561  *   We keep two hashes: one which can be quickly test: the metadata hash,
562  *   and one which is more expensive to test: the file contents hash.
563  *
564  *   If either hash matches, the file does not need to be re-read.
565  *   If only one of the hashes matches, a side effect of this function
566  *   is to store the newly computed hash.
567  *   If neither hash matches, the hash computed for the new file is returned
568  *   and not stored.
569  *
570  *   Return values:
571  *	MHASH_NEWFILE	- the file no longer matches the hash or no hash existed
572  *			  ONLY in this case we return the new file's hash.
573  *	MHASH_FAILURE	- an internal error occurred, or the file was not found.
574  *	MHASH_RECONCILED- based on the metadata/file hash, the file does
575  *			  not need to be re-read; if necessary,
576  *			  the hash was upgraded or reconciled.
577  *
578  * NOTE: no hash is returned UNLESS MHASH_NEWFILE is returned.
579  */
580 int
581 mhash_test_file(scf_handle_t *hndl, const char *file, uint_t is_profile,
582     char **pnamep, uchar_t *hashbuf)
583 {
584 	apply_action_t action;
585 	boolean_t do_hash;
586 	struct stat64 st;
587 	char *cp;
588 	char *data;
589 	uchar_t stored_hash[MHASH_SIZE];
590 	uchar_t hash[MHASH_SIZE];
591 	char *pname;
592 	int ret;
593 	int hashash;
594 	int metahashok = 0;
595 
596 	if (pnamep)
597 		*pnamep = NULL;
598 
599 	/*
600 	 * In the case where we are doing automated imports, we reduce the UID,
601 	 * the GID, the size, and the mtime into a string (to eliminate
602 	 * endianness) which we then make opaque as a single MD5 digest.
603 	 *
604 	 * The previous hash was composed of the inode number, the UID, the file
605 	 * size, and the mtime.  This formulation was found to be insufficiently
606 	 * portable for use in highly replicated deployments.  The current
607 	 * algorithm will allow matches of this "v1" hash, but always returns
608 	 * the effective "v2" hash, such that updates result in the more
609 	 * portable hash being used.
610 	 *
611 	 * An unwanted side effect of a hash based solely on the file
612 	 * meta data is the fact that we pay no attention to the contents
613 	 * which may remain the same despite meta data changes.  This happens
614 	 * with (live) upgrades.  We extend the V2 hash with an additional
615 	 * digest of the file contents and the code retrieving the hash
616 	 * from the repository zero fills the remainder so we can detect
617 	 * it is missing.
618 	 *
619 	 * If the the V2 digest matches, we check for the presence of
620 	 * the contents digest and compute and store it if missing.
621 	 *
622 	 * If the V2 digest doesn't match but we also have a non-zero
623 	 * file hash, we match the file content digest.  If it matches,
624 	 * we compute and store the new complete hash so that later
625 	 * checks will find the meta data digest correct.
626 	 *
627 	 * If the above matches fail and the V1 hash doesn't match either,
628 	 * we consider the test to have failed, implying that some aspect
629 	 * of the manifest has changed.
630 	 */
631 
632 	cp = getenv("SVCCFG_CHECKHASH");
633 	do_hash = (cp != NULL && *cp != '\0');
634 	if (!do_hash) {
635 		return (MHASH_NEWFILE);
636 	}
637 
638 	pname = mhash_filename_to_propname(file, B_FALSE);
639 	if (pname == NULL)
640 		return (MHASH_FAILURE);
641 
642 	hashash = mhash_retrieve_entry(hndl, pname, stored_hash, &action) == 0;
643 	if (is_profile == 0) {
644 		/* Actions other than APPLY_NONE are restricted to profiles. */
645 		assert(action == APPLY_NONE);
646 	}
647 
648 	/*
649 	 * As a general rule, we do not reread a profile.  The exception to
650 	 * this rule is when we are running as part of the manifest import
651 	 * service and the apply_late property is set to true.
652 	 */
653 	if (hashash && is_profile) {
654 		cp = getenv("SMF_FMRI");
655 		if ((cp == NULL) ||
656 		    (strcmp(cp, SCF_INSTANCE_MI) != 0) ||
657 		    (action != APPLY_LATE)) {
658 			uu_free(pname);
659 			return (MHASH_RECONCILED);
660 		}
661 	}
662 
663 	/*
664 	 * No hash and not interested in one, then don't bother computing it.
665 	 * We also skip returning the property name in that case.
666 	 */
667 	if (!hashash && hashbuf == NULL) {
668 		uu_free(pname);
669 		return (MHASH_NEWFILE);
670 	}
671 
672 	do {
673 		ret = stat64(file, &st);
674 	} while (ret < 0 && errno == EINTR);
675 	if (ret < 0) {
676 		uu_free(pname);
677 		return (MHASH_FAILURE);
678 	}
679 
680 	data = uu_msprintf(MHASH_FORMAT_V2, st.st_uid, st.st_gid,
681 	    st.st_size, st.st_mtime);
682 	if (data == NULL) {
683 		uu_free(pname);
684 		return (MHASH_FAILURE);
685 	}
686 
687 	(void) memset(hash, 0, MHASH_SIZE);
688 	md5_calc(hash, (uchar_t *)data, strlen(data));
689 
690 	uu_free(data);
691 
692 	/*
693 	 * Verify the meta data hash.
694 	 */
695 	if (hashash && memcmp(hash, stored_hash, MD5_DIGEST_LENGTH) == 0) {
696 		int i;
697 
698 		metahashok = 1;
699 		/*
700 		 * The metadata hash matches; now we see if there was a
701 		 * content hash; if not, we will continue on and compute and
702 		 * store the updated hash.
703 		 * If there was no content hash, mhash_retrieve_entry()
704 		 * will have zero filled it.
705 		 */
706 		for (i = 0; i < MD5_DIGEST_LENGTH; i++) {
707 			if (stored_hash[MD5_DIGEST_LENGTH+i] != 0) {
708 				if (action == APPLY_LATE) {
709 					if (pnamep != NULL)
710 						*pnamep = pname;
711 					ret = MHASH_NEWFILE;
712 				} else {
713 					uu_free(pname);
714 					ret = MHASH_RECONCILED;
715 				}
716 				return (ret);
717 			}
718 		}
719 	}
720 
721 	/*
722 	 * Compute the file hash as we can no longer avoid having to know it.
723 	 * Note: from this point on "hash" contains the full, current, hash.
724 	 */
725 	if (md5_hash_file(file, st.st_size, &hash[MHASH_SIZE_OLD]) != 0) {
726 		uu_free(pname);
727 		return (MHASH_FAILURE);
728 	}
729 	if (hashash) {
730 		uchar_t hash_v1[MHASH_SIZE_OLD];
731 
732 		if (metahashok ||
733 		    memcmp(&hash[MHASH_SIZE_OLD], &stored_hash[MHASH_SIZE_OLD],
734 		    MD5_DIGEST_LENGTH) == 0) {
735 
736 			/*
737 			 * Reconcile entry: we get here when either the
738 			 * meta data hash matches or the content hash matches;
739 			 * we then update the database with the complete
740 			 * new hash so we can be a bit quicker next time.
741 			 */
742 			(void) mhash_store_entry(hndl, pname, file, hash,
743 			    APPLY_NONE, NULL);
744 			if (action == APPLY_LATE) {
745 				if (pnamep != NULL)
746 					*pnamep = pname;
747 				ret = MHASH_NEWFILE;
748 			} else {
749 				uu_free(pname);
750 				ret = MHASH_RECONCILED;
751 			}
752 			return (ret);
753 		}
754 
755 		/*
756 		 * No match on V2 hash or file content; compare V1 hash.
757 		 */
758 		data = uu_msprintf(MHASH_FORMAT_V1, st.st_ino, st.st_uid,
759 		    st.st_size, st.st_mtime);
760 		if (data == NULL) {
761 			uu_free(pname);
762 			return (MHASH_FAILURE);
763 		}
764 
765 		md5_calc(hash_v1, (uchar_t *)data, strlen(data));
766 
767 		uu_free(data);
768 
769 		if (memcmp(hash_v1, stored_hash, MD5_DIGEST_LENGTH) == 0) {
770 			/*
771 			 * Update the new entry so we don't have to go through
772 			 * all this trouble next time.
773 			 */
774 			(void) mhash_store_entry(hndl, pname, file, hash,
775 			    APPLY_NONE, NULL);
776 			uu_free(pname);
777 			return (MHASH_RECONCILED);
778 		}
779 	}
780 
781 	if (pnamep != NULL)
782 		*pnamep = pname;
783 	else
784 		uu_free(pname);
785 
786 	if (hashbuf != NULL)
787 		(void) memcpy(hashbuf, hash, MHASH_SIZE);
788 
789 	return (MHASH_NEWFILE);
790 }
791