1: /*
2: * Handle passing Access Control Lists between systems.
3: *
4: * Copyright (C) 1996 Andrew Tridgell
5: * Copyright (C) 1996 Paul Mackerras
6: * Copyright (C) 2006-2020 Wayne Davison
7: *
8: * This program is free software; you can redistribute it and/or modify
9: * it under the terms of the GNU General Public License as published by
10: * the Free Software Foundation; either version 3 of the License, or
11: * (at your option) any later version.
12: *
13: * This program is distributed in the hope that it will be useful,
14: * but WITHOUT ANY WARRANTY; without even the implied warranty of
15: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: * GNU General Public License for more details.
17: *
18: * You should have received a copy of the GNU General Public License along
19: * with this program; if not, visit the http://fsf.org website.
20: */
21:
22: #include "rsync.h"
23: #include "lib/sysacls.h"
24:
25: #ifdef SUPPORT_ACLS
26:
27: extern int dry_run;
28: extern int am_root;
29: extern int read_only;
30: extern int list_only;
31: extern int orig_umask;
32: extern int numeric_ids;
33: extern int inc_recurse;
34: extern int preserve_devices;
35: extern int preserve_specials;
36:
37: /* Flags used to indicate what items are being transmitted for an entry. */
38: #define XMIT_USER_OBJ (1<<0)
39: #define XMIT_GROUP_OBJ (1<<1)
40: #define XMIT_MASK_OBJ (1<<2)
41: #define XMIT_OTHER_OBJ (1<<3)
42: #define XMIT_NAME_LIST (1<<4)
43:
44: #define NO_ENTRY ((uchar)0x80) /* Default value of a NON-name-list entry. */
45:
46: #define NAME_IS_USER (1u<<31) /* Bit used only on a name-list entry. */
47:
48: /* When we send the access bits over the wire, we shift them 2 bits to the
49: * left and use the lower 2 bits as flags (relevant only to a name entry).
50: * This makes the protocol more efficient than sending a value that would
51: * be likely to have its highest bits set. */
52: #define XFLAG_NAME_FOLLOWS 0x0001u
53: #define XFLAG_NAME_IS_USER 0x0002u
54:
55: /* === ACL structures === */
56:
57: typedef struct {
58: id_t id;
59: uint32 access;
60: } id_access;
61:
62: typedef struct {
63: id_access *idas;
64: int count;
65: } ida_entries;
66:
67: typedef struct {
68: char *name;
69: uchar len;
70: } idname;
71:
72: typedef struct rsync_acl {
73: ida_entries names;
74: /* These will be NO_ENTRY if there's no such entry. */
75: uchar user_obj;
76: uchar group_obj;
77: uchar mask_obj;
78: uchar other_obj;
79: } rsync_acl;
80:
81: typedef struct {
82: rsync_acl racl;
83: SMB_ACL_T sacl;
84: } acl_duo;
85:
86: static const rsync_acl empty_rsync_acl = {
87: {NULL, 0}, NO_ENTRY, NO_ENTRY, NO_ENTRY, NO_ENTRY
88: };
89:
90: static item_list access_acl_list = EMPTY_ITEM_LIST;
91: static item_list default_acl_list = EMPTY_ITEM_LIST;
92:
93: static size_t prior_access_count = (size_t)-1;
94: static size_t prior_default_count = (size_t)-1;
95:
96: /* === Calculations on ACL types === */
97:
98: static const char *str_acl_type(SMB_ACL_TYPE_T type)
99: {
100: switch (type) {
101: case SMB_ACL_TYPE_ACCESS:
102: #ifdef HAVE_OSX_ACLS
103: return "ACL_TYPE_EXTENDED";
104: #else
105: return "ACL_TYPE_ACCESS";
106: #endif
107: case SMB_ACL_TYPE_DEFAULT:
108: return "ACL_TYPE_DEFAULT";
109: default:
110: break;
111: }
112: return "unknown ACL type!";
113: }
114:
115: static int calc_sacl_entries(const rsync_acl *racl)
116: {
117: /* A System ACL always gets user/group/other permission entries. */
118: return racl->names.count
119: #ifdef ACLS_NEED_MASK
120: + 1
121: #else
122: + (racl->mask_obj != NO_ENTRY)
123: #endif
124: + 3;
125: }
126:
127: /* Extracts and returns the permission bits from the ACL. This cannot be
128: * called on an rsync_acl that has NO_ENTRY in any spot but the mask. */
129: static int rsync_acl_get_perms(const rsync_acl *racl)
130: {
131: return (racl->user_obj << 6)
132: + ((racl->mask_obj != NO_ENTRY ? racl->mask_obj : racl->group_obj) << 3)
133: + racl->other_obj;
134: }
135:
136: /* Removes the permission-bit entries from the ACL because these
137: * can be reconstructed from the file's mode. */
138: static void rsync_acl_strip_perms(stat_x *sxp)
139: {
140: rsync_acl *racl = sxp->acc_acl;
141:
142: racl->user_obj = NO_ENTRY;
143: if (racl->mask_obj == NO_ENTRY)
144: racl->group_obj = NO_ENTRY;
145: else {
146: int group_perms = (sxp->st.st_mode >> 3) & 7;
147: if (racl->group_obj == group_perms)
148: racl->group_obj = NO_ENTRY;
149: #ifndef HAVE_SOLARIS_ACLS
150: if (racl->names.count != 0 && racl->mask_obj == group_perms)
151: racl->mask_obj = NO_ENTRY;
152: #endif
153: }
154: racl->other_obj = NO_ENTRY;
155: }
156:
157: /* Given an empty rsync_acl, fake up the permission bits. */
158: static void rsync_acl_fake_perms(rsync_acl *racl, mode_t mode)
159: {
160: racl->user_obj = (mode >> 6) & 7;
161: racl->group_obj = (mode >> 3) & 7;
162: racl->other_obj = mode & 7;
163: }
164:
165: /* === Rsync ACL functions === */
166:
167: static rsync_acl *create_racl(void)
168: {
169: rsync_acl *racl = new(rsync_acl);
170:
171: *racl = empty_rsync_acl;
172:
173: return racl;
174: }
175:
176: static BOOL ida_entries_equal(const ida_entries *ial1, const ida_entries *ial2)
177: {
178: id_access *ida1, *ida2;
179: int count = ial1->count;
180: if (count != ial2->count)
181: return False;
182: ida1 = ial1->idas;
183: ida2 = ial2->idas;
184: for (; count--; ida1++, ida2++) {
185: if (ida1->access != ida2->access || ida1->id != ida2->id)
186: return False;
187: }
188: return True;
189: }
190:
191: static BOOL rsync_acl_equal(const rsync_acl *racl1, const rsync_acl *racl2)
192: {
193: return racl1->user_obj == racl2->user_obj
194: && racl1->group_obj == racl2->group_obj
195: && racl1->mask_obj == racl2->mask_obj
196: && racl1->other_obj == racl2->other_obj
197: && ida_entries_equal(&racl1->names, &racl2->names);
198: }
199:
200: /* Are the extended (non-permission-bit) entries equal? If so, the rest of
201: * the ACL will be handled by the normal mode-preservation code. This is
202: * only meaningful for access ACLs! Note: the 1st arg is a fully-populated
203: * rsync_acl, but the 2nd parameter can be a condensed rsync_acl, which means
204: * that it might have several of its permission objects set to NO_ENTRY. */
205: static BOOL rsync_acl_equal_enough(const rsync_acl *racl1,
206: const rsync_acl *racl2, mode_t m)
207: {
208: if ((racl1->mask_obj ^ racl2->mask_obj) & NO_ENTRY)
209: return False; /* One has a mask and the other doesn't */
210:
211: /* When there's a mask, the group_obj becomes an extended entry. */
212: if (racl1->mask_obj != NO_ENTRY) {
213: /* A condensed rsync_acl with a mask can only have no
214: * group_obj when it was identical to the mask. This
215: * means that it was also identical to the group attrs
216: * from the mode. */
217: if (racl2->group_obj == NO_ENTRY) {
218: if (racl1->group_obj != ((m >> 3) & 7))
219: return False;
220: } else if (racl1->group_obj != racl2->group_obj)
221: return False;
222: }
223: return ida_entries_equal(&racl1->names, &racl2->names);
224: }
225:
226: static void rsync_acl_free(rsync_acl *racl)
227: {
228: if (racl->names.idas)
229: free(racl->names.idas);
230: *racl = empty_rsync_acl;
231: }
232:
233: void free_acl(stat_x *sxp)
234: {
235: if (sxp->acc_acl) {
236: rsync_acl_free(sxp->acc_acl);
237: free(sxp->acc_acl);
238: sxp->acc_acl = NULL;
239: }
240: if (sxp->def_acl) {
241: rsync_acl_free(sxp->def_acl);
242: free(sxp->def_acl);
243: sxp->def_acl = NULL;
244: }
245: }
246:
247: #ifdef SMB_ACL_NEED_SORT
248: static int id_access_sorter(const void *r1, const void *r2)
249: {
250: id_access *ida1 = (id_access *)r1;
251: id_access *ida2 = (id_access *)r2;
252: id_t rid1 = ida1->id, rid2 = ida2->id;
253: if ((ida1->access ^ ida2->access) & NAME_IS_USER)
254: return ida1->access & NAME_IS_USER ? -1 : 1;
255: return rid1 == rid2 ? 0 : rid1 < rid2 ? -1 : 1;
256: }
257: #endif
258:
259: /* === System ACLs === */
260:
261: /* Unpack system ACL -> rsync ACL verbatim. Return whether we succeeded. */
262: static BOOL unpack_smb_acl(SMB_ACL_T sacl, rsync_acl *racl)
263: {
264: static item_list temp_ida_list = EMPTY_ITEM_LIST;
265: SMB_ACL_ENTRY_T entry;
266: const char *errfun;
267: int rc;
268:
269: errfun = "sys_acl_get_entry";
270: for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
271: rc == 1;
272: rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
273: SMB_ACL_TAG_T tag_type;
274: uint32 access;
275: id_t g_u_id;
276: id_access *ida;
277: if ((rc = sys_acl_get_info(entry, &tag_type, &access, &g_u_id)) != 0) {
278: errfun = "sys_acl_get_info";
279: break;
280: }
281: /* continue == done with entry; break == store in temporary ida list */
282: switch (tag_type) {
283: #ifndef HAVE_OSX_ACLS
284: case SMB_ACL_USER_OBJ:
285: if (racl->user_obj == NO_ENTRY)
286: racl->user_obj = access;
287: else
288: rprintf(FINFO, "unpack_smb_acl: warning: duplicate USER_OBJ entry ignored\n");
289: continue;
290: case SMB_ACL_GROUP_OBJ:
291: if (racl->group_obj == NO_ENTRY)
292: racl->group_obj = access;
293: else
294: rprintf(FINFO, "unpack_smb_acl: warning: duplicate GROUP_OBJ entry ignored\n");
295: continue;
296: case SMB_ACL_MASK:
297: if (racl->mask_obj == NO_ENTRY)
298: racl->mask_obj = access;
299: else
300: rprintf(FINFO, "unpack_smb_acl: warning: duplicate MASK entry ignored\n");
301: continue;
302: case SMB_ACL_OTHER:
303: if (racl->other_obj == NO_ENTRY)
304: racl->other_obj = access;
305: else
306: rprintf(FINFO, "unpack_smb_acl: warning: duplicate OTHER entry ignored\n");
307: continue;
308: #endif
309: case SMB_ACL_USER:
310: access |= NAME_IS_USER;
311: break;
312: case SMB_ACL_GROUP:
313: break;
314: default:
315: rprintf(FINFO, "unpack_smb_acl: warning: entry with unrecognized tag type ignored\n");
316: continue;
317: }
318: ida = EXPAND_ITEM_LIST(&temp_ida_list, id_access, -10);
319: ida->id = g_u_id;
320: ida->access = access;
321: }
322: if (rc) {
323: rsyserr(FERROR_XFER, errno, "unpack_smb_acl: %s()", errfun);
324: rsync_acl_free(racl);
325: return False;
326: }
327:
328: /* Transfer the count id_access items out of the temp_ida_list
329: * into the names ida_entries list in racl. */
330: if (temp_ida_list.count) {
331: #ifdef SMB_ACL_NEED_SORT
332: if (temp_ida_list.count > 1) {
333: qsort(temp_ida_list.items, temp_ida_list.count, sizeof (id_access), id_access_sorter);
334: }
335: #endif
336: racl->names.idas = new_array(id_access, temp_ida_list.count);
337: memcpy(racl->names.idas, temp_ida_list.items, temp_ida_list.count * sizeof (id_access));
338: } else
339: racl->names.idas = NULL;
340:
341: racl->names.count = temp_ida_list.count;
342:
343: /* Truncate the temporary list now that its idas have been saved. */
344: temp_ida_list.count = 0;
345:
346: return True;
347: }
348:
349: /* Synactic sugar for system calls */
350:
351: #define CALL_OR_ERROR(func,args,str) \
352: do { \
353: if (func args) { \
354: errfun = str; \
355: goto error_exit; \
356: } \
357: } while (0)
358:
359: #define COE(func,args) CALL_OR_ERROR(func,args,#func)
360: #define COE2(func,args) CALL_OR_ERROR(func,args,NULL)
361:
362: #ifndef HAVE_OSX_ACLS
363: /* Store the permissions in the system ACL entry. */
364: static int store_access_in_entry(uint32 access, SMB_ACL_ENTRY_T entry)
365: {
366: if (sys_acl_set_access_bits(entry, access)) {
367: rsyserr(FERROR_XFER, errno, "store_access_in_entry sys_acl_set_access_bits()");
368: return -1;
369: }
370: return 0;
371: }
372: #endif
373:
374: /* Pack rsync ACL -> system ACL verbatim. Return whether we succeeded. */
375: static BOOL pack_smb_acl(SMB_ACL_T *smb_acl, const rsync_acl *racl)
376: {
377: #ifdef ACLS_NEED_MASK
378: uchar mask_bits;
379: #endif
380: size_t count;
381: id_access *ida;
382: const char *errfun = NULL;
383: SMB_ACL_ENTRY_T entry;
384:
385: if (!(*smb_acl = sys_acl_init(calc_sacl_entries(racl)))) {
386: rsyserr(FERROR_XFER, errno, "pack_smb_acl: sys_acl_init()");
387: return False;
388: }
389:
390: #ifndef HAVE_OSX_ACLS
391: COE( sys_acl_create_entry,(smb_acl, &entry) );
392: COE( sys_acl_set_info,(entry, SMB_ACL_USER_OBJ, racl->user_obj & ~NO_ENTRY, 0) );
393: #endif
394:
395: for (ida = racl->names.idas, count = racl->names.count; count; ida++, count--) {
396: #ifdef SMB_ACL_NEED_SORT
397: if (!(ida->access & NAME_IS_USER))
398: break;
399: #endif
400: COE( sys_acl_create_entry,(smb_acl, &entry) );
401: COE( sys_acl_set_info,
402: (entry,
403: ida->access & NAME_IS_USER ? SMB_ACL_USER : SMB_ACL_GROUP,
404: ida->access & ~NAME_IS_USER, ida->id) );
405: }
406:
407: #ifndef HAVE_OSX_ACLS
408: COE( sys_acl_create_entry,(smb_acl, &entry) );
409: COE( sys_acl_set_info,(entry, SMB_ACL_GROUP_OBJ, racl->group_obj & ~NO_ENTRY, 0) );
410:
411: #ifdef SMB_ACL_NEED_SORT
412: for ( ; count; ida++, count--) {
413: COE( sys_acl_create_entry,(smb_acl, &entry) );
414: COE( sys_acl_set_info,(entry, SMB_ACL_GROUP, ida->access, ida->id) );
415: }
416: #endif
417:
418: #ifdef ACLS_NEED_MASK
419: mask_bits = racl->mask_obj == NO_ENTRY ? racl->group_obj & ~NO_ENTRY : racl->mask_obj;
420: COE( sys_acl_create_entry,(smb_acl, &entry) );
421: COE( sys_acl_set_info,(entry, SMB_ACL_MASK, mask_bits, 0) );
422: #else
423: if (racl->mask_obj != NO_ENTRY) {
424: COE( sys_acl_create_entry,(smb_acl, &entry) );
425: COE( sys_acl_set_info,(entry, SMB_ACL_MASK, racl->mask_obj, 0) );
426: }
427: #endif
428:
429: COE( sys_acl_create_entry,(smb_acl, &entry) );
430: COE( sys_acl_set_info,(entry, SMB_ACL_OTHER, racl->other_obj & ~NO_ENTRY, 0) );
431: #endif
432:
433: #ifdef DEBUG
434: if (sys_acl_valid(*smb_acl) < 0)
435: rprintf(FERROR_XFER, "pack_smb_acl: warning: system says the ACL I packed is invalid\n");
436: #endif
437:
438: return True;
439:
440: error_exit:
441: if (errfun) {
442: rsyserr(FERROR_XFER, errno, "pack_smb_acl %s()", errfun);
443: }
444: sys_acl_free_acl(*smb_acl);
445: return False;
446: }
447:
448: static int find_matching_rsync_acl(const rsync_acl *racl, SMB_ACL_TYPE_T type,
449: const item_list *racl_list)
450: {
451: static int access_match = -1, default_match = -1;
452: int *match = type == SMB_ACL_TYPE_ACCESS ? &access_match : &default_match;
453: size_t count = racl_list->count;
454:
455: /* If this is the first time through or we didn't match the last
456: * time, then start at the end of the list, which should be the
457: * best place to start hunting. */
458: if (*match == -1)
459: *match = racl_list->count - 1;
460: while (count--) {
461: rsync_acl *base = racl_list->items;
462: if (rsync_acl_equal(base + *match, racl))
463: return *match;
464: if (!(*match)--)
465: *match = racl_list->count - 1;
466: }
467:
468: *match = -1;
469: return *match;
470: }
471:
472: static int get_rsync_acl(const char *fname, rsync_acl *racl,
473: SMB_ACL_TYPE_T type, mode_t mode)
474: {
475: SMB_ACL_T sacl;
476:
477: #ifdef SUPPORT_XATTRS
478: /* --fake-super support: load ACLs from an xattr. */
479: if (am_root < 0) {
480: char *buf;
481: size_t len;
482: int cnt;
483:
484: if ((buf = get_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, &len)) == NULL)
485: return 0;
486: cnt = (len - 4*4) / (4+4);
487: if (len < 4*4 || len != (size_t)cnt*(4+4) + 4*4) {
488: free(buf);
489: return -1;
490: }
491:
492: racl->user_obj = IVAL(buf, 0);
493: if (racl->user_obj == NO_ENTRY)
494: racl->user_obj = (mode >> 6) & 7;
495: racl->group_obj = IVAL(buf, 4);
496: if (racl->group_obj == NO_ENTRY)
497: racl->group_obj = (mode >> 3) & 7;
498: racl->mask_obj = IVAL(buf, 8);
499: racl->other_obj = IVAL(buf, 12);
500: if (racl->other_obj == NO_ENTRY)
501: racl->other_obj = mode & 7;
502:
503: if (cnt) {
504: char *bp = buf + 4*4;
505: id_access *ida = racl->names.idas = new_array(id_access, cnt);
506: racl->names.count = cnt;
507: for ( ; cnt--; ida++, bp += 4+4) {
508: ida->id = IVAL(bp, 0);
509: ida->access = IVAL(bp, 4);
510: }
511: }
512: free(buf);
513: return 0;
514: }
515: #endif
516:
517: if ((sacl = sys_acl_get_file(fname, type)) != 0) {
518: BOOL ok = unpack_smb_acl(sacl, racl);
519:
520: sys_acl_free_acl(sacl);
521: if (!ok) {
522: return -1;
523: }
524: } else if (no_acl_syscall_error(errno)) {
525: /* ACLs are not supported, so pretend we have a basic ACL. */
526: if (type == SMB_ACL_TYPE_ACCESS)
527: rsync_acl_fake_perms(racl, mode);
528: } else {
529: rsyserr(FERROR_XFER, errno, "get_acl: sys_acl_get_file(%s, %s)",
530: fname, str_acl_type(type));
531: return -1;
532: }
533:
534: return 0;
535: }
536:
537: /* Return the Access Control List for the given filename. */
538: int get_acl(const char *fname, stat_x *sxp)
539: {
540: sxp->acc_acl = create_racl();
541:
542: if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
543: /* Everyone supports this. */
544: } else if (S_ISLNK(sxp->st.st_mode)) {
545: return 0;
546: } else if (IS_SPECIAL(sxp->st.st_mode)) {
547: #ifndef NO_SPECIAL_ACLS
548: if (!preserve_specials)
549: #endif
550: return 0;
551: } else if (IS_DEVICE(sxp->st.st_mode)) {
552: #ifndef NO_DEVICE_ACLS
553: if (!preserve_devices)
554: #endif
555: return 0;
556: } else if (IS_MISSING_FILE(sxp->st))
557: return 0;
558:
559: if (get_rsync_acl(fname, sxp->acc_acl, SMB_ACL_TYPE_ACCESS,
560: sxp->st.st_mode) < 0) {
561: free_acl(sxp);
562: return -1;
563: }
564:
565: if (S_ISDIR(sxp->st.st_mode)) {
566: sxp->def_acl = create_racl();
567: if (get_rsync_acl(fname, sxp->def_acl, SMB_ACL_TYPE_DEFAULT,
568: sxp->st.st_mode) < 0) {
569: free_acl(sxp);
570: return -1;
571: }
572: }
573:
574: return 0;
575: }
576:
577: /* === Send functions === */
578:
579: /* Send the ida list over the file descriptor. */
580: static void send_ida_entries(int f, const ida_entries *idal)
581: {
582: id_access *ida;
583: size_t count = idal->count;
584:
585: write_varint(f, idal->count);
586:
587: for (ida = idal->idas; count--; ida++) {
588: uint32 xbits = ida->access << 2;
589: const char *name;
590: if (ida->access & NAME_IS_USER) {
591: xbits |= XFLAG_NAME_IS_USER;
592: name = numeric_ids ? NULL : add_uid(ida->id);
593: } else
594: name = numeric_ids ? NULL : add_gid(ida->id);
595: write_varint(f, ida->id);
596: if (inc_recurse && name) {
597: int len = strlen(name);
598: write_varint(f, xbits | XFLAG_NAME_FOLLOWS);
599: write_byte(f, len);
600: write_buf(f, name, len);
601: } else
602: write_varint(f, xbits);
603: }
604: }
605:
606: static void send_rsync_acl(int f, rsync_acl *racl, SMB_ACL_TYPE_T type,
607: item_list *racl_list)
608: {
609: int ndx = find_matching_rsync_acl(racl, type, racl_list);
610:
611: /* Send 0 (-1 + 1) to indicate that literal ACL data follows. */
612: write_varint(f, ndx + 1);
613:
614: if (ndx < 0) {
615: rsync_acl *new_racl = EXPAND_ITEM_LIST(racl_list, rsync_acl, 1000);
616: uchar flags = 0;
617:
618: if (racl->user_obj != NO_ENTRY)
619: flags |= XMIT_USER_OBJ;
620: if (racl->group_obj != NO_ENTRY)
621: flags |= XMIT_GROUP_OBJ;
622: if (racl->mask_obj != NO_ENTRY)
623: flags |= XMIT_MASK_OBJ;
624: if (racl->other_obj != NO_ENTRY)
625: flags |= XMIT_OTHER_OBJ;
626: if (racl->names.count)
627: flags |= XMIT_NAME_LIST;
628:
629: write_byte(f, flags);
630:
631: if (flags & XMIT_USER_OBJ)
632: write_varint(f, racl->user_obj);
633: if (flags & XMIT_GROUP_OBJ)
634: write_varint(f, racl->group_obj);
635: if (flags & XMIT_MASK_OBJ)
636: write_varint(f, racl->mask_obj);
637: if (flags & XMIT_OTHER_OBJ)
638: write_varint(f, racl->other_obj);
639: if (flags & XMIT_NAME_LIST)
640: send_ida_entries(f, &racl->names);
641:
642: /* Give the allocated data to the new list object. */
643: *new_racl = *racl;
644: *racl = empty_rsync_acl;
645: }
646: }
647:
648: /* Send the ACL from the stat_x structure down the indicated file descriptor.
649: * This also frees the ACL data. */
650: void send_acl(int f, stat_x *sxp)
651: {
652: if (!sxp->acc_acl) {
653: sxp->acc_acl = create_racl();
654: rsync_acl_fake_perms(sxp->acc_acl, sxp->st.st_mode);
655: }
656: /* Avoid sending values that can be inferred from other data. */
657: rsync_acl_strip_perms(sxp);
658:
659: send_rsync_acl(f, sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list);
660:
661: if (S_ISDIR(sxp->st.st_mode)) {
662: if (!sxp->def_acl)
663: sxp->def_acl = create_racl();
664:
665: send_rsync_acl(f, sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list);
666: }
667: }
668:
669: /* === Receive functions === */
670:
671: static uint32 recv_acl_access(int f, uchar *name_follows_ptr)
672: {
673: uint32 access = read_varint(f);
674:
675: if (name_follows_ptr) {
676: int flags = access & 3;
677: access >>= 2;
678: if (am_root >= 0 && access & ~SMB_ACL_VALID_NAME_BITS)
679: goto value_error;
680: if (flags & XFLAG_NAME_FOLLOWS)
681: *name_follows_ptr = 1;
682: else
683: *name_follows_ptr = 0;
684: if (flags & XFLAG_NAME_IS_USER)
685: access |= NAME_IS_USER;
686: } else if (am_root >= 0 && access & ~SMB_ACL_VALID_OBJ_BITS) {
687: value_error:
688: rprintf(FERROR_XFER, "recv_acl_access: value out of range: %x\n",
689: access);
690: exit_cleanup(RERR_STREAMIO);
691: }
692:
693: return access;
694: }
695:
696: static uchar recv_ida_entries(int f, ida_entries *ent)
697: {
698: uchar computed_mask_bits = 0;
699: int i, count = read_varint(f);
700:
701: ent->idas = count ? new_array(id_access, count) : NULL;
702: ent->count = count;
703:
704: for (i = 0; i < count; i++) {
705: uchar has_name;
706: id_t id = read_varint(f);
707: uint32 access = recv_acl_access(f, &has_name);
708:
709: if (has_name) {
710: if (access & NAME_IS_USER)
711: id = recv_user_name(f, id);
712: else
713: id = recv_group_name(f, id, NULL);
714: } else if (access & NAME_IS_USER) {
715: if (inc_recurse && am_root && !numeric_ids)
716: id = match_uid(id);
717: } else {
718: if (inc_recurse && (!am_root || !numeric_ids))
719: id = match_gid(id, NULL);
720: }
721:
722: ent->idas[i].id = id;
723: ent->idas[i].access = access;
724: computed_mask_bits |= access;
725: }
726:
727: return computed_mask_bits & ~NO_ENTRY;
728: }
729:
730: static int recv_rsync_acl(int f, item_list *racl_list, SMB_ACL_TYPE_T type, mode_t mode)
731: {
732: uchar computed_mask_bits = 0;
733: acl_duo *duo_item;
734: uchar flags;
735: int ndx = read_varint(f);
736:
737: if (ndx < 0 || (size_t)ndx > racl_list->count) {
738: rprintf(FERROR_XFER, "recv_acl_index: %s ACL index %d > %d\n",
739: str_acl_type(type), ndx, (int)racl_list->count);
740: exit_cleanup(RERR_STREAMIO);
741: }
742:
743: if (ndx != 0)
744: return ndx - 1;
745:
746: ndx = racl_list->count;
747: duo_item = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
748: duo_item->racl = empty_rsync_acl;
749:
750: flags = read_byte(f);
751:
752: if (flags & XMIT_USER_OBJ)
753: duo_item->racl.user_obj = recv_acl_access(f, NULL);
754: if (flags & XMIT_GROUP_OBJ)
755: duo_item->racl.group_obj = recv_acl_access(f, NULL);
756: if (flags & XMIT_MASK_OBJ)
757: duo_item->racl.mask_obj = recv_acl_access(f, NULL);
758: if (flags & XMIT_OTHER_OBJ)
759: duo_item->racl.other_obj = recv_acl_access(f, NULL);
760: if (flags & XMIT_NAME_LIST)
761: computed_mask_bits |= recv_ida_entries(f, &duo_item->racl.names);
762:
763: #ifdef HAVE_OSX_ACLS
764: /* If we received a superfluous mask, throw it away. */
765: duo_item->racl.mask_obj = NO_ENTRY;
766: #else
767: if (duo_item->racl.names.count && duo_item->racl.mask_obj == NO_ENTRY) {
768: /* Mask must be non-empty with lists. */
769: if (type == SMB_ACL_TYPE_ACCESS)
770: computed_mask_bits = (mode >> 3) & 7;
771: else
772: computed_mask_bits |= duo_item->racl.group_obj & ~NO_ENTRY;
773: duo_item->racl.mask_obj = computed_mask_bits;
774: }
775: #endif
776:
777: duo_item->sacl = NULL;
778:
779: return ndx;
780: }
781:
782: /* Receive the ACL info the sender has included for this file-list entry. */
783: void receive_acl(int f, struct file_struct *file)
784: {
785: F_ACL(file) = recv_rsync_acl(f, &access_acl_list, SMB_ACL_TYPE_ACCESS, file->mode);
786:
787: if (S_ISDIR(file->mode))
788: F_DIR_DEFACL(file) = recv_rsync_acl(f, &default_acl_list, SMB_ACL_TYPE_DEFAULT, 0);
789: }
790:
791: static int cache_rsync_acl(rsync_acl *racl, SMB_ACL_TYPE_T type, item_list *racl_list)
792: {
793: int ndx;
794:
795: if (!racl)
796: ndx = -1;
797: else if ((ndx = find_matching_rsync_acl(racl, type, racl_list)) == -1) {
798: acl_duo *new_duo;
799: ndx = racl_list->count;
800: new_duo = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
801: new_duo->racl = *racl;
802: new_duo->sacl = NULL;
803: *racl = empty_rsync_acl;
804: }
805:
806: return ndx;
807: }
808:
809: /* Turn the ACL data in stat_x into cached ACL data, setting the index
810: * values in the file struct. */
811: void cache_tmp_acl(struct file_struct *file, stat_x *sxp)
812: {
813: if (prior_access_count == (size_t)-1)
814: prior_access_count = access_acl_list.count;
815:
816: F_ACL(file) = cache_rsync_acl(sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list);
817:
818: if (S_ISDIR(sxp->st.st_mode)) {
819: if (prior_default_count == (size_t)-1)
820: prior_default_count = default_acl_list.count;
821: F_DIR_DEFACL(file) = cache_rsync_acl(sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list);
822: }
823: }
824:
825: static void uncache_duo_acls(item_list *duo_list, size_t start)
826: {
827: acl_duo *duo_item = duo_list->items;
828: acl_duo *duo_start = duo_item + start;
829:
830: duo_item += duo_list->count;
831: duo_list->count = start;
832:
833: while (duo_item-- > duo_start) {
834: rsync_acl_free(&duo_item->racl);
835: if (duo_item->sacl)
836: sys_acl_free_acl(duo_item->sacl);
837: }
838: }
839:
840: void uncache_tmp_acls(void)
841: {
842: if (prior_access_count != (size_t)-1) {
843: uncache_duo_acls(&access_acl_list, prior_access_count);
844: prior_access_count = (size_t)-1;
845: }
846:
847: if (prior_default_count != (size_t)-1) {
848: uncache_duo_acls(&default_acl_list, prior_default_count);
849: prior_default_count = (size_t)-1;
850: }
851: }
852:
853: #ifndef HAVE_OSX_ACLS
854: static mode_t change_sacl_perms(SMB_ACL_T sacl, rsync_acl *racl, mode_t old_mode, mode_t mode)
855: {
856: SMB_ACL_ENTRY_T entry;
857: const char *errfun;
858: int rc;
859:
860: if (S_ISDIR(mode)) {
861: /* If the sticky bit is going on, it's not safe to allow all
862: * the new ACL to go into effect before it gets set. */
863: #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
864: if (mode & S_ISVTX)
865: mode &= ~0077;
866: #else
867: if (mode & S_ISVTX && !(old_mode & S_ISVTX))
868: mode &= ~0077;
869: } else {
870: /* If setuid or setgid is going off, it's not safe to allow all
871: * the new ACL to go into effect before they get cleared. */
872: if ((old_mode & S_ISUID && !(mode & S_ISUID))
873: || (old_mode & S_ISGID && !(mode & S_ISGID)))
874: mode &= ~0077;
875: #endif
876: }
877:
878: errfun = "sys_acl_get_entry";
879: for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
880: rc == 1;
881: rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
882: SMB_ACL_TAG_T tag_type;
883: if ((rc = sys_acl_get_tag_type(entry, &tag_type)) != 0) {
884: errfun = "sys_acl_get_tag_type";
885: break;
886: }
887: switch (tag_type) {
888: case SMB_ACL_USER_OBJ:
889: COE2( store_access_in_entry,((mode >> 6) & 7, entry) );
890: break;
891: case SMB_ACL_GROUP_OBJ:
892: /* group is only empty when identical to group perms. */
893: if (racl->group_obj != NO_ENTRY)
894: break;
895: COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
896: break;
897: case SMB_ACL_MASK:
898: #ifndef HAVE_SOLARIS_ACLS
899: #ifndef ACLS_NEED_MASK
900: /* mask is only empty when we don't need it. */
901: if (racl->mask_obj == NO_ENTRY)
902: break;
903: #endif
904: COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
905: #endif
906: break;
907: case SMB_ACL_OTHER:
908: COE2( store_access_in_entry,(mode & 7, entry) );
909: break;
910: }
911: }
912: if (rc) {
913: error_exit:
914: if (errfun) {
915: rsyserr(FERROR_XFER, errno, "change_sacl_perms: %s()",
916: errfun);
917: }
918: return (mode_t)-1;
919: }
920:
921: #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
922: /* Ensure that chmod() will be called to restore any lost setid bits. */
923: if (old_mode & (S_ISUID | S_ISGID | S_ISVTX)
924: && BITS_EQUAL(old_mode, mode, CHMOD_BITS))
925: old_mode &= ~(S_ISUID | S_ISGID | S_ISVTX);
926: #endif
927:
928: /* Return the mode of the file on disk, as we will set them. */
929: return (old_mode & ~ACCESSPERMS) | (mode & ACCESSPERMS);
930: }
931: #endif
932:
933: static int set_rsync_acl(const char *fname, acl_duo *duo_item,
934: SMB_ACL_TYPE_T type, stat_x *sxp, mode_t mode)
935: {
936: if (type == SMB_ACL_TYPE_DEFAULT
937: && duo_item->racl.user_obj == NO_ENTRY) {
938: int rc;
939: #ifdef SUPPORT_XATTRS
940: /* --fake-super support: delete default ACL from xattrs. */
941: if (am_root < 0)
942: rc = del_def_xattr_acl(fname);
943: else
944: #endif
945: rc = sys_acl_delete_def_file(fname);
946: if (rc < 0) {
947: rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_delete_def_file(%s)",
948: fname);
949: return -1;
950: }
951: #ifdef SUPPORT_XATTRS
952: } else if (am_root < 0) {
953: /* --fake-super support: store ACLs in an xattr. */
954: int cnt = duo_item->racl.names.count;
955: size_t len = 4*4 + cnt * (4+4);
956: char *buf = new_array(char, len);
957: int rc;
958:
959: SIVAL(buf, 0, duo_item->racl.user_obj);
960: SIVAL(buf, 4, duo_item->racl.group_obj);
961: SIVAL(buf, 8, duo_item->racl.mask_obj);
962: SIVAL(buf, 12, duo_item->racl.other_obj);
963:
964: if (cnt) {
965: char *bp = buf + 4*4;
966: id_access *ida = duo_item->racl.names.idas;
967: for ( ; cnt--; ida++, bp += 4+4) {
968: SIVAL(bp, 0, ida->id);
969: SIVAL(bp, 4, ida->access);
970: }
971: }
972: rc = set_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, buf, len);
973: free(buf);
974: return rc;
975: #endif
976: } else {
977: mode_t cur_mode = sxp->st.st_mode;
978: if (!duo_item->sacl
979: && !pack_smb_acl(&duo_item->sacl, &duo_item->racl))
980: return -1;
981: #ifdef HAVE_OSX_ACLS
982: mode = 0; /* eliminate compiler warning */
983: #else
984: if (type == SMB_ACL_TYPE_ACCESS) {
985: cur_mode = change_sacl_perms(duo_item->sacl, &duo_item->racl, cur_mode, mode);
986: if (cur_mode == (mode_t)-1)
987: return 0;
988: }
989: #endif
990: if (sys_acl_set_file(fname, type, duo_item->sacl) < 0) {
991: rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_set_file(%s, %s)",
992: fname, str_acl_type(type));
993: return -1;
994: }
995: if (type == SMB_ACL_TYPE_ACCESS)
996: sxp->st.st_mode = cur_mode;
997: }
998:
999: return 0;
1000: }
1001:
1002: /* Given a fname, this sets extended access ACL entries, the default ACL (for a
1003: * dir), and the regular mode bits on the file. Call this with fname set to
1004: * NULL to just check if the ACL is different.
1005: *
1006: * If the ACL operation has a side-effect of changing the file's mode, the
1007: * sxp->st.st_mode value will be changed to match.
1008: *
1009: * Returns 0 for an unchanged ACL, 1 for changed, -1 for failed. */
1010: int set_acl(const char *fname, const struct file_struct *file, stat_x *sxp, mode_t new_mode)
1011: {
1012: int changed = 0;
1013: int32 ndx;
1014: BOOL eq;
1015:
1016: if (!dry_run && (read_only || list_only)) {
1017: errno = EROFS;
1018: return -1;
1019: }
1020:
1021: ndx = F_ACL(file);
1022: if (ndx >= 0 && (size_t)ndx < access_acl_list.count) {
1023: acl_duo *duo_item = access_acl_list.items;
1024: duo_item += ndx;
1025: eq = sxp->acc_acl
1026: && rsync_acl_equal_enough(sxp->acc_acl, &duo_item->racl, new_mode);
1027: if (!eq) {
1028: changed = 1;
1029: if (!dry_run && fname
1030: && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_ACCESS,
1031: sxp, new_mode) < 0)
1032: return -1;
1033: }
1034: }
1035:
1036: if (!S_ISDIR(new_mode))
1037: return changed;
1038:
1039: ndx = F_DIR_DEFACL(file);
1040: if (ndx >= 0 && (size_t)ndx < default_acl_list.count) {
1041: acl_duo *duo_item = default_acl_list.items;
1042: duo_item += ndx;
1043: eq = sxp->def_acl && rsync_acl_equal(sxp->def_acl, &duo_item->racl);
1044: if (!eq) {
1045: changed = 1;
1046: if (!dry_run && fname
1047: && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_DEFAULT,
1048: sxp, new_mode) < 0)
1049: return -1;
1050: }
1051: }
1052:
1053: return changed;
1054: }
1055:
1056: /* Non-incremental recursion needs to convert all the received IDs.
1057: * This is done in a single pass after receiving the whole file-list. */
1058: static void match_racl_ids(const item_list *racl_list)
1059: {
1060: int list_cnt, name_cnt;
1061: acl_duo *duo_item = racl_list->items;
1062: for (list_cnt = racl_list->count; list_cnt--; duo_item++) {
1063: ida_entries *idal = &duo_item->racl.names;
1064: id_access *ida = idal->idas;
1065: for (name_cnt = idal->count; name_cnt--; ida++) {
1066: if (ida->access & NAME_IS_USER)
1067: ida->id = match_uid(ida->id);
1068: else
1069: ida->id = match_gid(ida->id, NULL);
1070: }
1071: }
1072: }
1073:
1074: void match_acl_ids(void)
1075: {
1076: match_racl_ids(&access_acl_list);
1077: match_racl_ids(&default_acl_list);
1078: }
1079:
1080: /* This is used by dest_mode(). */
1081: int default_perms_for_dir(const char *dir)
1082: {
1083: rsync_acl racl;
1084: SMB_ACL_T sacl;
1085: BOOL ok;
1086: int perms;
1087:
1088: if (dir == NULL)
1089: dir = ".";
1090: perms = ACCESSPERMS & ~orig_umask;
1091: /* Read the directory's default ACL. If it has none, this will successfully return an empty ACL. */
1092: sacl = sys_acl_get_file(dir, SMB_ACL_TYPE_DEFAULT);
1093: if (sacl == NULL) {
1094: /* Couldn't get an ACL. Darn. */
1095: switch (errno) {
1096: case EINVAL:
1097: /* If SMB_ACL_TYPE_DEFAULT isn't valid, then the ACLs must be non-POSIX. */
1098: break;
1099: #ifdef ENOTSUP
1100: case ENOTSUP:
1101: #endif
1102: case ENOSYS:
1103: /* No ACLs are available. */
1104: break;
1105: default:
1106: if (dry_run && errno == ENOENT) {
1107: /* We're doing a dry run, so the containing directory
1108: * wasn't actually created. Don't worry about it. */
1109: break;
1110: }
1111: rprintf(FWARNING,
1112: "default_perms_for_dir: sys_acl_get_file(%s, %s): %s, falling back on umask\n",
1113: dir, str_acl_type(SMB_ACL_TYPE_DEFAULT), strerror(errno));
1114: }
1115: return perms;
1116: }
1117:
1118: /* Convert it. */
1119: racl = empty_rsync_acl;
1120: ok = unpack_smb_acl(sacl, &racl);
1121: sys_acl_free_acl(sacl);
1122: if (!ok) {
1123: rprintf(FWARNING, "default_perms_for_dir: unpack_smb_acl failed, falling back on umask\n");
1124: return perms;
1125: }
1126:
1127: /* Apply the permission-bit entries of the default ACL, if any. */
1128: if (racl.user_obj != NO_ENTRY) {
1129: perms = rsync_acl_get_perms(&racl);
1130: if (DEBUG_GTE(ACL, 1))
1131: rprintf(FINFO, "got ACL-based default perms %o for directory %s\n", perms, dir);
1132: }
1133:
1134: rsync_acl_free(&racl);
1135: return perms;
1136: }
1137:
1138: #endif /* SUPPORT_ACLS */
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to acls.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / rsync