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) 2006-2009 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 hightest 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: if (!racl)
172: out_of_memory("create_racl");
173: *racl = empty_rsync_acl;
174:
175: return racl;
176: }
177:
178: static BOOL ida_entries_equal(const ida_entries *ial1, const ida_entries *ial2)
179: {
180: id_access *ida1, *ida2;
181: int count = ial1->count;
182: if (count != ial2->count)
183: return False;
184: ida1 = ial1->idas;
185: ida2 = ial2->idas;
186: for (; count--; ida1++, ida2++) {
187: if (ida1->access != ida2->access || ida1->id != ida2->id)
188: return False;
189: }
190: return True;
191: }
192:
193: static BOOL rsync_acl_equal(const rsync_acl *racl1, const rsync_acl *racl2)
194: {
195: return racl1->user_obj == racl2->user_obj
196: && racl1->group_obj == racl2->group_obj
197: && racl1->mask_obj == racl2->mask_obj
198: && racl1->other_obj == racl2->other_obj
199: && ida_entries_equal(&racl1->names, &racl2->names);
200: }
201:
202: /* Are the extended (non-permission-bit) entries equal? If so, the rest of
203: * the ACL will be handled by the normal mode-preservation code. This is
204: * only meaningful for access ACLs! Note: the 1st arg is a fully-populated
205: * rsync_acl, but the 2nd parameter can be a condensed rsync_acl, which means
206: * that it might have several of its permission objects set to NO_ENTRY. */
207: static BOOL rsync_acl_equal_enough(const rsync_acl *racl1,
208: const rsync_acl *racl2, mode_t m)
209: {
210: if ((racl1->mask_obj ^ racl2->mask_obj) & NO_ENTRY)
211: return False; /* One has a mask and the other doesn't */
212:
213: /* When there's a mask, the group_obj becomes an extended entry. */
214: if (racl1->mask_obj != NO_ENTRY) {
215: /* A condensed rsync_acl with a mask can only have no
216: * group_obj when it was identical to the mask. This
217: * means that it was also identical to the group attrs
218: * from the mode. */
219: if (racl2->group_obj == NO_ENTRY) {
220: if (racl1->group_obj != ((m >> 3) & 7))
221: return False;
222: } else if (racl1->group_obj != racl2->group_obj)
223: return False;
224: }
225: return ida_entries_equal(&racl1->names, &racl2->names);
226: }
227:
228: static void rsync_acl_free(rsync_acl *racl)
229: {
230: if (racl->names.idas)
231: free(racl->names.idas);
232: *racl = empty_rsync_acl;
233: }
234:
235: void free_acl(stat_x *sxp)
236: {
237: if (sxp->acc_acl) {
238: rsync_acl_free(sxp->acc_acl);
239: free(sxp->acc_acl);
240: sxp->acc_acl = NULL;
241: }
242: if (sxp->def_acl) {
243: rsync_acl_free(sxp->def_acl);
244: free(sxp->def_acl);
245: sxp->def_acl = NULL;
246: }
247: }
248:
249: #ifdef SMB_ACL_NEED_SORT
250: static int id_access_sorter(const void *r1, const void *r2)
251: {
252: id_access *ida1 = (id_access *)r1;
253: id_access *ida2 = (id_access *)r2;
254: id_t rid1 = ida1->id, rid2 = ida2->id;
255: if ((ida1->access ^ ida2->access) & NAME_IS_USER)
256: return ida1->access & NAME_IS_USER ? -1 : 1;
257: return rid1 == rid2 ? 0 : rid1 < rid2 ? -1 : 1;
258: }
259: #endif
260:
261: /* === System ACLs === */
262:
263: /* Unpack system ACL -> rsync ACL verbatim. Return whether we succeeded. */
264: static BOOL unpack_smb_acl(SMB_ACL_T sacl, rsync_acl *racl)
265: {
266: static item_list temp_ida_list = EMPTY_ITEM_LIST;
267: SMB_ACL_ENTRY_T entry;
268: const char *errfun;
269: int rc;
270:
271: errfun = "sys_acl_get_entry";
272: for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
273: rc == 1;
274: rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
275: SMB_ACL_TAG_T tag_type;
276: uint32 access;
277: id_t g_u_id;
278: id_access *ida;
279: if ((rc = sys_acl_get_info(entry, &tag_type, &access, &g_u_id)) != 0) {
280: errfun = "sys_acl_get_info";
281: break;
282: }
283: /* continue == done with entry; break == store in temporary ida list */
284: switch (tag_type) {
285: #ifndef HAVE_OSX_ACLS
286: case SMB_ACL_USER_OBJ:
287: if (racl->user_obj == NO_ENTRY)
288: racl->user_obj = access;
289: else
290: rprintf(FINFO, "unpack_smb_acl: warning: duplicate USER_OBJ entry ignored\n");
291: continue;
292: case SMB_ACL_GROUP_OBJ:
293: if (racl->group_obj == NO_ENTRY)
294: racl->group_obj = access;
295: else
296: rprintf(FINFO, "unpack_smb_acl: warning: duplicate GROUP_OBJ entry ignored\n");
297: continue;
298: case SMB_ACL_MASK:
299: if (racl->mask_obj == NO_ENTRY)
300: racl->mask_obj = access;
301: else
302: rprintf(FINFO, "unpack_smb_acl: warning: duplicate MASK entry ignored\n");
303: continue;
304: case SMB_ACL_OTHER:
305: if (racl->other_obj == NO_ENTRY)
306: racl->other_obj = access;
307: else
308: rprintf(FINFO, "unpack_smb_acl: warning: duplicate OTHER entry ignored\n");
309: continue;
310: #endif
311: case SMB_ACL_USER:
312: access |= NAME_IS_USER;
313: break;
314: case SMB_ACL_GROUP:
315: break;
316: default:
317: rprintf(FINFO, "unpack_smb_acl: warning: entry with unrecognized tag type ignored\n");
318: continue;
319: }
320: ida = EXPAND_ITEM_LIST(&temp_ida_list, id_access, -10);
321: ida->id = g_u_id;
322: ida->access = access;
323: }
324: if (rc) {
325: rsyserr(FERROR_XFER, errno, "unpack_smb_acl: %s()", errfun);
326: rsync_acl_free(racl);
327: return False;
328: }
329:
330: /* Transfer the count id_access items out of the temp_ida_list
331: * into the names ida_entries list in racl. */
332: if (temp_ida_list.count) {
333: #ifdef SMB_ACL_NEED_SORT
334: if (temp_ida_list.count > 1) {
335: qsort(temp_ida_list.items, temp_ida_list.count,
336: sizeof (id_access), id_access_sorter);
337: }
338: #endif
339: if (!(racl->names.idas = new_array(id_access, temp_ida_list.count)))
340: out_of_memory("unpack_smb_acl");
341: memcpy(racl->names.idas, temp_ida_list.items,
342: temp_ida_list.count * sizeof (id_access));
343: } else
344: racl->names.idas = NULL;
345:
346: racl->names.count = temp_ida_list.count;
347:
348: /* Truncate the temporary list now that its idas have been saved. */
349: temp_ida_list.count = 0;
350:
351: return True;
352: }
353:
354: /* Synactic sugar for system calls */
355:
356: #define CALL_OR_ERROR(func,args,str) \
357: do { \
358: if (func args) { \
359: errfun = str; \
360: goto error_exit; \
361: } \
362: } while (0)
363:
364: #define COE(func,args) CALL_OR_ERROR(func,args,#func)
365: #define COE2(func,args) CALL_OR_ERROR(func,args,NULL)
366:
367: #ifndef HAVE_OSX_ACLS
368: /* Store the permissions in the system ACL entry. */
369: static int store_access_in_entry(uint32 access, SMB_ACL_ENTRY_T entry)
370: {
371: if (sys_acl_set_access_bits(entry, access)) {
372: rsyserr(FERROR_XFER, errno, "store_access_in_entry sys_acl_set_access_bits()");
373: return -1;
374: }
375: return 0;
376: }
377: #endif
378:
379: /* Pack rsync ACL -> system ACL verbatim. Return whether we succeeded. */
380: static BOOL pack_smb_acl(SMB_ACL_T *smb_acl, const rsync_acl *racl)
381: {
382: #ifdef ACLS_NEED_MASK
383: uchar mask_bits;
384: #endif
385: size_t count;
386: id_access *ida;
387: const char *errfun = NULL;
388: SMB_ACL_ENTRY_T entry;
389:
390: if (!(*smb_acl = sys_acl_init(calc_sacl_entries(racl)))) {
391: rsyserr(FERROR_XFER, errno, "pack_smb_acl: sys_acl_init()");
392: return False;
393: }
394:
395: #ifndef HAVE_OSX_ACLS
396: COE( sys_acl_create_entry,(smb_acl, &entry) );
397: COE( sys_acl_set_info,(entry, SMB_ACL_USER_OBJ, racl->user_obj & ~NO_ENTRY, 0) );
398: #endif
399:
400: for (ida = racl->names.idas, count = racl->names.count; count; ida++, count--) {
401: #ifdef SMB_ACL_NEED_SORT
402: if (!(ida->access & NAME_IS_USER))
403: break;
404: #endif
405: COE( sys_acl_create_entry,(smb_acl, &entry) );
406: COE( sys_acl_set_info,
407: (entry,
408: ida->access & NAME_IS_USER ? SMB_ACL_USER : SMB_ACL_GROUP,
409: ida->access & ~NAME_IS_USER, ida->id) );
410: }
411:
412: #ifndef HAVE_OSX_ACLS
413: COE( sys_acl_create_entry,(smb_acl, &entry) );
414: COE( sys_acl_set_info,(entry, SMB_ACL_GROUP_OBJ, racl->group_obj & ~NO_ENTRY, 0) );
415:
416: #ifdef SMB_ACL_NEED_SORT
417: for ( ; count; ida++, count--) {
418: COE( sys_acl_create_entry,(smb_acl, &entry) );
419: COE( sys_acl_set_info,(entry, SMB_ACL_GROUP, ida->access, ida->id) );
420: }
421: #endif
422:
423: #ifdef ACLS_NEED_MASK
424: mask_bits = racl->mask_obj == NO_ENTRY ? racl->group_obj & ~NO_ENTRY : racl->mask_obj;
425: COE( sys_acl_create_entry,(smb_acl, &entry) );
426: COE( sys_acl_set_info,(entry, SMB_ACL_MASK, mask_bits, NULL) );
427: #else
428: if (racl->mask_obj != NO_ENTRY) {
429: COE( sys_acl_create_entry,(smb_acl, &entry) );
430: COE( sys_acl_set_info,(entry, SMB_ACL_MASK, racl->mask_obj, 0) );
431: }
432: #endif
433:
434: COE( sys_acl_create_entry,(smb_acl, &entry) );
435: COE( sys_acl_set_info,(entry, SMB_ACL_OTHER, racl->other_obj & ~NO_ENTRY, 0) );
436: #endif
437:
438: #ifdef DEBUG
439: if (sys_acl_valid(*smb_acl) < 0)
440: rprintf(FERROR_XFER, "pack_smb_acl: warning: system says the ACL I packed is invalid\n");
441: #endif
442:
443: return True;
444:
445: error_exit:
446: if (errfun) {
447: rsyserr(FERROR_XFER, errno, "pack_smb_acl %s()", errfun);
448: }
449: sys_acl_free_acl(*smb_acl);
450: return False;
451: }
452:
453: static int find_matching_rsync_acl(const rsync_acl *racl, SMB_ACL_TYPE_T type,
454: const item_list *racl_list)
455: {
456: static int access_match = -1, default_match = -1;
457: int *match = type == SMB_ACL_TYPE_ACCESS ? &access_match : &default_match;
458: size_t count = racl_list->count;
459:
460: /* If this is the first time through or we didn't match the last
461: * time, then start at the end of the list, which should be the
462: * best place to start hunting. */
463: if (*match == -1)
464: *match = racl_list->count - 1;
465: while (count--) {
466: rsync_acl *base = racl_list->items;
467: if (rsync_acl_equal(base + *match, racl))
468: return *match;
469: if (!(*match)--)
470: *match = racl_list->count - 1;
471: }
472:
473: *match = -1;
474: return *match;
475: }
476:
477: static int get_rsync_acl(const char *fname, rsync_acl *racl,
478: SMB_ACL_TYPE_T type, mode_t mode)
479: {
480: SMB_ACL_T sacl;
481:
482: #ifdef SUPPORT_XATTRS
483: /* --fake-super support: load ACLs from an xattr. */
484: if (am_root < 0) {
485: char *buf;
486: size_t len;
487: int cnt;
488:
489: if ((buf = get_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, &len)) == NULL)
490: return 0;
491: cnt = (len - 4*4) / (4+4);
492: if (len < 4*4 || len != (size_t)cnt*(4+4) + 4*4) {
493: free(buf);
494: return -1;
495: }
496:
497: racl->user_obj = IVAL(buf, 0);
498: if (racl->user_obj == NO_ENTRY)
499: racl->user_obj = (mode >> 6) & 7;
500: racl->group_obj = IVAL(buf, 4);
501: if (racl->group_obj == NO_ENTRY)
502: racl->group_obj = (mode >> 3) & 7;
503: racl->mask_obj = IVAL(buf, 8);
504: racl->other_obj = IVAL(buf, 12);
505: if (racl->other_obj == NO_ENTRY)
506: racl->other_obj = mode & 7;
507:
508: if (cnt) {
509: char *bp = buf + 4*4;
510: id_access *ida;
511: if (!(ida = racl->names.idas = new_array(id_access, cnt)))
512: out_of_memory("get_rsync_acl");
513: racl->names.count = cnt;
514: for ( ; cnt--; ida++, bp += 4+4) {
515: ida->id = IVAL(bp, 0);
516: ida->access = IVAL(bp, 4);
517: }
518: }
519: free(buf);
520: return 0;
521: }
522: #endif
523:
524: if ((sacl = sys_acl_get_file(fname, type)) != 0) {
525: BOOL ok = unpack_smb_acl(sacl, racl);
526:
527: sys_acl_free_acl(sacl);
528: if (!ok) {
529: return -1;
530: }
531: } else if (no_acl_syscall_error(errno)) {
532: /* ACLs are not supported, so pretend we have a basic ACL. */
533: if (type == SMB_ACL_TYPE_ACCESS)
534: rsync_acl_fake_perms(racl, mode);
535: } else {
536: rsyserr(FERROR_XFER, errno, "get_acl: sys_acl_get_file(%s, %s)",
537: fname, str_acl_type(type));
538: return -1;
539: }
540:
541: return 0;
542: }
543:
544: /* Return the Access Control List for the given filename. */
545: int get_acl(const char *fname, stat_x *sxp)
546: {
547: sxp->acc_acl = create_racl();
548:
549: if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
550: /* Everyone supports this. */
551: } else if (S_ISLNK(sxp->st.st_mode)) {
552: return 0;
553: } else if (IS_SPECIAL(sxp->st.st_mode)) {
554: #ifndef NO_SPECIAL_ACLS
555: if (!preserve_specials)
556: #endif
557: return 0;
558: } else if (IS_DEVICE(sxp->st.st_mode)) {
559: #ifndef NO_DEVICE_ACLS
560: if (!preserve_devices)
561: #endif
562: return 0;
563: }
564:
565: if (get_rsync_acl(fname, sxp->acc_acl, SMB_ACL_TYPE_ACCESS,
566: sxp->st.st_mode) < 0) {
567: free_acl(sxp);
568: return -1;
569: }
570:
571: if (S_ISDIR(sxp->st.st_mode)) {
572: sxp->def_acl = create_racl();
573: if (get_rsync_acl(fname, sxp->def_acl, SMB_ACL_TYPE_DEFAULT,
574: sxp->st.st_mode) < 0) {
575: free_acl(sxp);
576: return -1;
577: }
578: }
579:
580: return 0;
581: }
582:
583: /* === Send functions === */
584:
585: /* Send the ida list over the file descriptor. */
586: static void send_ida_entries(int f, const ida_entries *idal)
587: {
588: id_access *ida;
589: size_t count = idal->count;
590:
591: write_varint(f, idal->count);
592:
593: for (ida = idal->idas; count--; ida++) {
594: uint32 xbits = ida->access << 2;
595: const char *name;
596: if (ida->access & NAME_IS_USER) {
597: xbits |= XFLAG_NAME_IS_USER;
598: name = numeric_ids ? NULL : add_uid(ida->id);
599: } else
600: name = numeric_ids ? NULL : add_gid(ida->id);
601: write_varint(f, ida->id);
602: if (inc_recurse && name) {
603: int len = strlen(name);
604: write_varint(f, xbits | XFLAG_NAME_FOLLOWS);
605: write_byte(f, len);
606: write_buf(f, name, len);
607: } else
608: write_varint(f, xbits);
609: }
610: }
611:
612: static void send_rsync_acl(int f, rsync_acl *racl, SMB_ACL_TYPE_T type,
613: item_list *racl_list)
614: {
615: int ndx = find_matching_rsync_acl(racl, type, racl_list);
616:
617: /* Send 0 (-1 + 1) to indicate that literal ACL data follows. */
618: write_varint(f, ndx + 1);
619:
620: if (ndx < 0) {
621: rsync_acl *new_racl = EXPAND_ITEM_LIST(racl_list, rsync_acl, 1000);
622: uchar flags = 0;
623:
624: if (racl->user_obj != NO_ENTRY)
625: flags |= XMIT_USER_OBJ;
626: if (racl->group_obj != NO_ENTRY)
627: flags |= XMIT_GROUP_OBJ;
628: if (racl->mask_obj != NO_ENTRY)
629: flags |= XMIT_MASK_OBJ;
630: if (racl->other_obj != NO_ENTRY)
631: flags |= XMIT_OTHER_OBJ;
632: if (racl->names.count)
633: flags |= XMIT_NAME_LIST;
634:
635: write_byte(f, flags);
636:
637: if (flags & XMIT_USER_OBJ)
638: write_varint(f, racl->user_obj);
639: if (flags & XMIT_GROUP_OBJ)
640: write_varint(f, racl->group_obj);
641: if (flags & XMIT_MASK_OBJ)
642: write_varint(f, racl->mask_obj);
643: if (flags & XMIT_OTHER_OBJ)
644: write_varint(f, racl->other_obj);
645: if (flags & XMIT_NAME_LIST)
646: send_ida_entries(f, &racl->names);
647:
648: /* Give the allocated data to the new list object. */
649: *new_racl = *racl;
650: *racl = empty_rsync_acl;
651: }
652: }
653:
654: /* Send the ACL from the stat_x structure down the indicated file descriptor.
655: * This also frees the ACL data. */
656: void send_acl(int f, stat_x *sxp)
657: {
658: if (!sxp->acc_acl) {
659: sxp->acc_acl = create_racl();
660: rsync_acl_fake_perms(sxp->acc_acl, sxp->st.st_mode);
661: }
662: /* Avoid sending values that can be inferred from other data. */
663: rsync_acl_strip_perms(sxp);
664:
665: send_rsync_acl(f, sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list);
666:
667: if (S_ISDIR(sxp->st.st_mode)) {
668: if (!sxp->def_acl)
669: sxp->def_acl = create_racl();
670:
671: send_rsync_acl(f, sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list);
672: }
673: }
674:
675: /* === Receive functions === */
676:
677: static uint32 recv_acl_access(int f, uchar *name_follows_ptr)
678: {
679: uint32 access = read_varint(f);
680:
681: if (name_follows_ptr) {
682: int flags = access & 3;
683: access >>= 2;
684: if (am_root >= 0 && access & ~SMB_ACL_VALID_NAME_BITS)
685: goto value_error;
686: if (flags & XFLAG_NAME_FOLLOWS)
687: *name_follows_ptr = 1;
688: else
689: *name_follows_ptr = 0;
690: if (flags & XFLAG_NAME_IS_USER)
691: access |= NAME_IS_USER;
692: } else if (am_root >= 0 && access & ~SMB_ACL_VALID_OBJ_BITS) {
693: value_error:
694: rprintf(FERROR_XFER, "recv_acl_access: value out of range: %x\n",
695: access);
696: exit_cleanup(RERR_STREAMIO);
697: }
698:
699: return access;
700: }
701:
702: static uchar recv_ida_entries(int f, ida_entries *ent)
703: {
704: uchar computed_mask_bits = 0;
705: int i, count = read_varint(f);
706:
707: if (count) {
708: if (!(ent->idas = new_array(id_access, count)))
709: out_of_memory("recv_ida_entries");
710: } else
711: ent->idas = NULL;
712:
713: ent->count = count;
714:
715: for (i = 0; i < count; i++) {
716: uchar has_name;
717: id_t id = read_varint(f);
718: uint32 access = recv_acl_access(f, &has_name);
719:
720: if (has_name) {
721: if (access & NAME_IS_USER)
722: id = recv_user_name(f, id);
723: else
724: id = recv_group_name(f, id, NULL);
725: } else if (access & NAME_IS_USER) {
726: if (inc_recurse && am_root && !numeric_ids)
727: id = match_uid(id);
728: } else {
729: if (inc_recurse && (!am_root || !numeric_ids))
730: id = match_gid(id, NULL);
731: }
732:
733: ent->idas[i].id = id;
734: ent->idas[i].access = access;
735: computed_mask_bits |= access;
736: }
737:
738: return computed_mask_bits & ~NO_ENTRY;
739: }
740:
741: static int recv_rsync_acl(int f, item_list *racl_list, SMB_ACL_TYPE_T type, mode_t mode)
742: {
743: uchar computed_mask_bits = 0;
744: acl_duo *duo_item;
745: uchar flags;
746: int ndx = read_varint(f);
747:
748: if (ndx < 0 || (size_t)ndx > racl_list->count) {
749: rprintf(FERROR_XFER, "recv_acl_index: %s ACL index %d > %d\n",
750: str_acl_type(type), ndx, (int)racl_list->count);
751: exit_cleanup(RERR_STREAMIO);
752: }
753:
754: if (ndx != 0)
755: return ndx - 1;
756:
757: ndx = racl_list->count;
758: duo_item = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
759: duo_item->racl = empty_rsync_acl;
760:
761: flags = read_byte(f);
762:
763: if (flags & XMIT_USER_OBJ)
764: duo_item->racl.user_obj = recv_acl_access(f, NULL);
765: if (flags & XMIT_GROUP_OBJ)
766: duo_item->racl.group_obj = recv_acl_access(f, NULL);
767: if (flags & XMIT_MASK_OBJ)
768: duo_item->racl.mask_obj = recv_acl_access(f, NULL);
769: if (flags & XMIT_OTHER_OBJ)
770: duo_item->racl.other_obj = recv_acl_access(f, NULL);
771: if (flags & XMIT_NAME_LIST)
772: computed_mask_bits |= recv_ida_entries(f, &duo_item->racl.names);
773:
774: #ifdef HAVE_OSX_ACLS
775: /* If we received a superfluous mask, throw it away. */
776: duo_item->racl.mask_obj = NO_ENTRY;
777: #else
778: if (duo_item->racl.names.count && duo_item->racl.mask_obj == NO_ENTRY) {
779: /* Mask must be non-empty with lists. */
780: if (type == SMB_ACL_TYPE_ACCESS)
781: computed_mask_bits = (mode >> 3) & 7;
782: else
783: computed_mask_bits |= duo_item->racl.group_obj & ~NO_ENTRY;
784: duo_item->racl.mask_obj = computed_mask_bits;
785: }
786: #endif
787:
788: duo_item->sacl = NULL;
789:
790: return ndx;
791: }
792:
793: /* Receive the ACL info the sender has included for this file-list entry. */
794: void receive_acl(int f, struct file_struct *file)
795: {
796: F_ACL(file) = recv_rsync_acl(f, &access_acl_list, SMB_ACL_TYPE_ACCESS, file->mode);
797:
798: if (S_ISDIR(file->mode))
799: F_DIR_DEFACL(file) = recv_rsync_acl(f, &default_acl_list, SMB_ACL_TYPE_DEFAULT, 0);
800: }
801:
802: static int cache_rsync_acl(rsync_acl *racl, SMB_ACL_TYPE_T type, item_list *racl_list)
803: {
804: int ndx;
805:
806: if (!racl)
807: ndx = -1;
808: else if ((ndx = find_matching_rsync_acl(racl, type, racl_list)) == -1) {
809: acl_duo *new_duo;
810: ndx = racl_list->count;
811: new_duo = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
812: new_duo->racl = *racl;
813: new_duo->sacl = NULL;
814: *racl = empty_rsync_acl;
815: }
816:
817: return ndx;
818: }
819:
820: /* Turn the ACL data in stat_x into cached ACL data, setting the index
821: * values in the file struct. */
822: void cache_tmp_acl(struct file_struct *file, stat_x *sxp)
823: {
824: if (prior_access_count == (size_t)-1)
825: prior_access_count = access_acl_list.count;
826:
827: F_ACL(file) = cache_rsync_acl(sxp->acc_acl,
828: SMB_ACL_TYPE_ACCESS, &access_acl_list);
829:
830: if (S_ISDIR(sxp->st.st_mode)) {
831: if (prior_default_count == (size_t)-1)
832: prior_default_count = default_acl_list.count;
833: F_DIR_DEFACL(file) = cache_rsync_acl(sxp->def_acl,
834: SMB_ACL_TYPE_DEFAULT, &default_acl_list);
835: }
836: }
837:
838: static void uncache_duo_acls(item_list *duo_list, size_t start)
839: {
840: acl_duo *duo_item = duo_list->items;
841: acl_duo *duo_start = duo_item + start;
842:
843: duo_item += duo_list->count;
844: duo_list->count = start;
845:
846: while (duo_item-- > duo_start) {
847: rsync_acl_free(&duo_item->racl);
848: if (duo_item->sacl)
849: sys_acl_free_acl(duo_item->sacl);
850: }
851: }
852:
853: void uncache_tmp_acls(void)
854: {
855: if (prior_access_count != (size_t)-1) {
856: uncache_duo_acls(&access_acl_list, prior_access_count);
857: prior_access_count = (size_t)-1;
858: }
859:
860: if (prior_default_count != (size_t)-1) {
861: uncache_duo_acls(&default_acl_list, prior_default_count);
862: prior_default_count = (size_t)-1;
863: }
864: }
865:
866: #ifndef HAVE_OSX_ACLS
867: static mode_t change_sacl_perms(SMB_ACL_T sacl, rsync_acl *racl, mode_t old_mode, mode_t mode)
868: {
869: SMB_ACL_ENTRY_T entry;
870: const char *errfun;
871: int rc;
872:
873: if (S_ISDIR(mode)) {
874: /* If the sticky bit is going on, it's not safe to allow all
875: * the new ACL to go into effect before it gets set. */
876: #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
877: if (mode & S_ISVTX)
878: mode &= ~0077;
879: #else
880: if (mode & S_ISVTX && !(old_mode & S_ISVTX))
881: mode &= ~0077;
882: } else {
883: /* If setuid or setgid is going off, it's not safe to allow all
884: * the new ACL to go into effect before they get cleared. */
885: if ((old_mode & S_ISUID && !(mode & S_ISUID))
886: || (old_mode & S_ISGID && !(mode & S_ISGID)))
887: mode &= ~0077;
888: #endif
889: }
890:
891: errfun = "sys_acl_get_entry";
892: for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
893: rc == 1;
894: rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
895: SMB_ACL_TAG_T tag_type;
896: if ((rc = sys_acl_get_tag_type(entry, &tag_type)) != 0) {
897: errfun = "sys_acl_get_tag_type";
898: break;
899: }
900: switch (tag_type) {
901: case SMB_ACL_USER_OBJ:
902: COE2( store_access_in_entry,((mode >> 6) & 7, entry) );
903: break;
904: case SMB_ACL_GROUP_OBJ:
905: /* group is only empty when identical to group perms. */
906: if (racl->group_obj != NO_ENTRY)
907: break;
908: COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
909: break;
910: case SMB_ACL_MASK:
911: #ifndef HAVE_SOLARIS_ACLS
912: #ifndef ACLS_NEED_MASK
913: /* mask is only empty when we don't need it. */
914: if (racl->mask_obj == NO_ENTRY)
915: break;
916: #endif
917: COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
918: #endif
919: break;
920: case SMB_ACL_OTHER:
921: COE2( store_access_in_entry,(mode & 7, entry) );
922: break;
923: }
924: }
925: if (rc) {
926: error_exit:
927: if (errfun) {
928: rsyserr(FERROR_XFER, errno, "change_sacl_perms: %s()",
929: errfun);
930: }
931: return (mode_t)-1;
932: }
933:
934: #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
935: /* Ensure that chmod() will be called to restore any lost setid bits. */
936: if (old_mode & (S_ISUID | S_ISGID | S_ISVTX)
937: && BITS_EQUAL(old_mode, mode, CHMOD_BITS))
938: old_mode &= ~(S_ISUID | S_ISGID | S_ISVTX);
939: #endif
940:
941: /* Return the mode of the file on disk, as we will set them. */
942: return (old_mode & ~ACCESSPERMS) | (mode & ACCESSPERMS);
943: }
944: #endif
945:
946: static int set_rsync_acl(const char *fname, acl_duo *duo_item,
947: SMB_ACL_TYPE_T type, stat_x *sxp, mode_t mode)
948: {
949: if (type == SMB_ACL_TYPE_DEFAULT
950: && duo_item->racl.user_obj == NO_ENTRY) {
951: int rc;
952: #ifdef SUPPORT_XATTRS
953: /* --fake-super support: delete default ACL from xattrs. */
954: if (am_root < 0)
955: rc = del_def_xattr_acl(fname);
956: else
957: #endif
958: rc = sys_acl_delete_def_file(fname);
959: if (rc < 0) {
960: rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_delete_def_file(%s)",
961: fname);
962: return -1;
963: }
964: #ifdef SUPPORT_XATTRS
965: } else if (am_root < 0) {
966: /* --fake-super support: store ACLs in an xattr. */
967: int cnt = duo_item->racl.names.count;
968: size_t len = 4*4 + cnt * (4+4);
969: char *buf = new_array(char, len);
970: int rc;
971:
972: SIVAL(buf, 0, duo_item->racl.user_obj);
973: SIVAL(buf, 4, duo_item->racl.group_obj);
974: SIVAL(buf, 8, duo_item->racl.mask_obj);
975: SIVAL(buf, 12, duo_item->racl.other_obj);
976:
977: if (cnt) {
978: char *bp = buf + 4*4;
979: id_access *ida = duo_item->racl.names.idas;
980: for ( ; cnt--; ida++, bp += 4+4) {
981: SIVAL(bp, 0, ida->id);
982: SIVAL(bp, 4, ida->access);
983: }
984: }
985: rc = set_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, buf, len);
986: free(buf);
987: return rc;
988: #endif
989: } else {
990: mode_t cur_mode = sxp->st.st_mode;
991: if (!duo_item->sacl
992: && !pack_smb_acl(&duo_item->sacl, &duo_item->racl))
993: return -1;
994: #ifdef HAVE_OSX_ACLS
995: mode = 0; /* eliminate compiler warning */
996: #else
997: if (type == SMB_ACL_TYPE_ACCESS) {
998: cur_mode = change_sacl_perms(duo_item->sacl, &duo_item->racl,
999: cur_mode, mode);
1000: if (cur_mode == (mode_t)-1)
1001: return 0;
1002: }
1003: #endif
1004: if (sys_acl_set_file(fname, type, duo_item->sacl) < 0) {
1005: rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_set_file(%s, %s)",
1006: fname, str_acl_type(type));
1007: return -1;
1008: }
1009: if (type == SMB_ACL_TYPE_ACCESS)
1010: sxp->st.st_mode = cur_mode;
1011: }
1012:
1013: return 0;
1014: }
1015:
1016: /* Given a fname, this sets extended access ACL entries, the default ACL (for a
1017: * dir), and the regular mode bits on the file. Call this with fname set to
1018: * NULL to just check if the ACL is different.
1019: *
1020: * If the ACL operation has a side-effect of changing the file's mode, the
1021: * sxp->st.st_mode value will be changed to match.
1022: *
1023: * Returns 0 for an unchanged ACL, 1 for changed, -1 for failed. */
1024: int set_acl(const char *fname, const struct file_struct *file, stat_x *sxp, mode_t new_mode)
1025: {
1026: int changed = 0;
1027: int32 ndx;
1028: BOOL eq;
1029:
1030: if (!dry_run && (read_only || list_only)) {
1031: errno = EROFS;
1032: return -1;
1033: }
1034:
1035: ndx = F_ACL(file);
1036: if (ndx >= 0 && (size_t)ndx < access_acl_list.count) {
1037: acl_duo *duo_item = access_acl_list.items;
1038: duo_item += ndx;
1039: eq = sxp->acc_acl
1040: && rsync_acl_equal_enough(sxp->acc_acl, &duo_item->racl, new_mode);
1041: if (!eq) {
1042: changed = 1;
1043: if (!dry_run && fname
1044: && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_ACCESS,
1045: sxp, new_mode) < 0)
1046: return -1;
1047: }
1048: }
1049:
1050: if (!S_ISDIR(new_mode))
1051: return changed;
1052:
1053: ndx = F_DIR_DEFACL(file);
1054: if (ndx >= 0 && (size_t)ndx < default_acl_list.count) {
1055: acl_duo *duo_item = default_acl_list.items;
1056: duo_item += ndx;
1057: eq = sxp->def_acl && rsync_acl_equal(sxp->def_acl, &duo_item->racl);
1058: if (!eq) {
1059: changed = 1;
1060: if (!dry_run && fname
1061: && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_DEFAULT,
1062: sxp, new_mode) < 0)
1063: return -1;
1064: }
1065: }
1066:
1067: return changed;
1068: }
1069:
1070: /* Non-incremental recursion needs to convert all the received IDs.
1071: * This is done in a single pass after receiving the whole file-list. */
1072: static void match_racl_ids(const item_list *racl_list)
1073: {
1074: int list_cnt, name_cnt;
1075: acl_duo *duo_item = racl_list->items;
1076: for (list_cnt = racl_list->count; list_cnt--; duo_item++) {
1077: ida_entries *idal = &duo_item->racl.names;
1078: id_access *ida = idal->idas;
1079: for (name_cnt = idal->count; name_cnt--; ida++) {
1080: if (ida->access & NAME_IS_USER)
1081: ida->id = match_uid(ida->id);
1082: else
1083: ida->id = match_gid(ida->id, NULL);
1084: }
1085: }
1086: }
1087:
1088: void match_acl_ids(void)
1089: {
1090: match_racl_ids(&access_acl_list);
1091: match_racl_ids(&default_acl_list);
1092: }
1093:
1094: /* This is used by dest_mode(). */
1095: int default_perms_for_dir(const char *dir)
1096: {
1097: rsync_acl racl;
1098: SMB_ACL_T sacl;
1099: BOOL ok;
1100: int perms;
1101:
1102: if (dir == NULL)
1103: dir = ".";
1104: perms = ACCESSPERMS & ~orig_umask;
1105: /* Read the directory's default ACL. If it has none, this will successfully return an empty ACL. */
1106: sacl = sys_acl_get_file(dir, SMB_ACL_TYPE_DEFAULT);
1107: if (sacl == NULL) {
1108: /* Couldn't get an ACL. Darn. */
1109: switch (errno) {
1110: case EINVAL:
1111: /* If SMB_ACL_TYPE_DEFAULT isn't valid, then the ACLs must be non-POSIX. */
1112: break;
1113: #ifdef ENOTSUP
1114: case ENOTSUP:
1115: #endif
1116: case ENOSYS:
1117: /* No ACLs are available. */
1118: break;
1119: case ENOENT:
1120: if (dry_run) {
1121: /* We're doing a dry run, so the containing directory
1122: * wasn't actually created. Don't worry about it. */
1123: break;
1124: }
1125: /* Otherwise fall through. */
1126: default:
1127: rprintf(FWARNING,
1128: "default_perms_for_dir: sys_acl_get_file(%s, %s): %s, falling back on umask\n",
1129: dir, str_acl_type(SMB_ACL_TYPE_DEFAULT), strerror(errno));
1130: }
1131: return perms;
1132: }
1133:
1134: /* Convert it. */
1135: racl = empty_rsync_acl;
1136: ok = unpack_smb_acl(sacl, &racl);
1137: sys_acl_free_acl(sacl);
1138: if (!ok) {
1139: rprintf(FWARNING, "default_perms_for_dir: unpack_smb_acl failed, falling back on umask\n");
1140: return perms;
1141: }
1142:
1143: /* Apply the permission-bit entries of the default ACL, if any. */
1144: if (racl.user_obj != NO_ENTRY) {
1145: perms = rsync_acl_get_perms(&racl);
1146: if (verbose > 2)
1147: rprintf(FINFO, "got ACL-based default perms %o for directory %s\n", perms, dir);
1148: }
1149:
1150: rsync_acl_free(&racl);
1151: return perms;
1152: }
1153:
1154: #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