/* * Handle passing Access Control Lists between systems. * * Copyright (C) 1996 Andrew Tridgell * Copyright (C) 1996 Paul Mackerras * Copyright (C) 2006-2022 Wayne Davison * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, visit the http://fsf.org website. */ #include "rsync.h" #include "lib/sysacls.h" #include "lib/acl.h" #ifdef HAVE_LIBACL_AT #include /* AT_EMPTY_PATH / AT_SYMLINK_NOFOLLOW */ #endif #ifdef SUPPORT_ACLS extern int dry_run; extern int am_root; extern int read_only; extern int list_only; extern mode_t orig_umask; extern int numeric_ids; extern int inc_recurse; extern int preserve_devices; extern int preserve_specials; /* Flags used to indicate what items are being transmitted for an entry. */ #define XMIT_USER_OBJ (1<<0) #define XMIT_GROUP_OBJ (1<<1) #define XMIT_MASK_OBJ (1<<2) #define XMIT_OTHER_OBJ (1<<3) #define XMIT_NAME_LIST (1<<4) #define NO_ENTRY ((uchar)0x80) /* Default value of a NON-name-list entry. */ #define NAME_IS_USER (1u<<31) /* Bit used only on a name-list entry. */ /* When we send the access bits over the wire, we shift them 2 bits to the * left and use the lower 2 bits as flags (relevant only to a name entry). * This makes the protocol more efficient than sending a value that would * be likely to have its highest bits set. */ #define XFLAG_NAME_FOLLOWS 0x0001u #define XFLAG_NAME_IS_USER 0x0002u /* === ACL structures === */ typedef struct { id_t id; uint32 access; } id_access; typedef struct { id_access *idas; int count; } ida_entries; typedef struct { char *name; uchar len; } idname; typedef struct rsync_acl { ida_entries names; /* These will be NO_ENTRY if there's no such entry. */ uchar user_obj; uchar group_obj; uchar mask_obj; uchar other_obj; } rsync_acl; typedef struct { rsync_acl racl; SMB_ACL_T sacl; } acl_duo; static const rsync_acl empty_rsync_acl = { {NULL, 0}, NO_ENTRY, NO_ENTRY, NO_ENTRY, NO_ENTRY }; static item_list access_acl_list = EMPTY_ITEM_LIST; static item_list default_acl_list = EMPTY_ITEM_LIST; static size_t prior_access_count = (size_t)-1; static size_t prior_default_count = (size_t)-1; /* === Calculations on ACL types === */ static const char *str_acl_type(SMB_ACL_TYPE_T type) { switch (type) { case SMB_ACL_TYPE_ACCESS: #ifdef HAVE_OSX_ACLS return "ACL_TYPE_EXTENDED"; #else return "ACL_TYPE_ACCESS"; #endif case SMB_ACL_TYPE_DEFAULT: return "ACL_TYPE_DEFAULT"; default: break; } return "unknown ACL type!"; } static int calc_sacl_entries(const rsync_acl *racl) { /* A System ACL always gets user/group/other permission entries. */ return racl->names.count #ifdef ACLS_NEED_MASK + 1 #else + (racl->mask_obj != NO_ENTRY) #endif + 3; } /* Extracts and returns the permission bits from the ACL. This cannot be * called on an rsync_acl that has NO_ENTRY in any spot but the mask. */ static int rsync_acl_get_perms(const rsync_acl *racl) { return (racl->user_obj << 6) + ((racl->mask_obj != NO_ENTRY ? racl->mask_obj : racl->group_obj) << 3) + racl->other_obj; } /* Removes the permission-bit entries from the ACL because these * can be reconstructed from the file's mode. */ static void rsync_acl_strip_perms(stat_x *sxp) { rsync_acl *racl = sxp->acc_acl; racl->user_obj = NO_ENTRY; if (racl->mask_obj == NO_ENTRY) racl->group_obj = NO_ENTRY; else { int group_perms = (sxp->st.st_mode >> 3) & 7; if (racl->group_obj == group_perms) racl->group_obj = NO_ENTRY; #ifndef HAVE_SOLARIS_ACLS if (racl->names.count != 0 && racl->mask_obj == group_perms) racl->mask_obj = NO_ENTRY; #endif } racl->other_obj = NO_ENTRY; } /* Given an empty rsync_acl, fake up the permission bits. */ static void rsync_acl_fake_perms(rsync_acl *racl, mode_t mode) { racl->user_obj = (mode >> 6) & 7; racl->group_obj = (mode >> 3) & 7; racl->other_obj = mode & 7; } /* === Rsync ACL functions === */ static rsync_acl *create_racl(void) { rsync_acl *racl = new(rsync_acl); *racl = empty_rsync_acl; return racl; } static BOOL ida_entries_equal(const ida_entries *ial1, const ida_entries *ial2) { id_access *ida1, *ida2; int count = ial1->count; if (count != ial2->count) return False; ida1 = ial1->idas; ida2 = ial2->idas; for (; count--; ida1++, ida2++) { if (ida1->access != ida2->access || ida1->id != ida2->id) return False; } return True; } static BOOL rsync_acl_equal(const rsync_acl *racl1, const rsync_acl *racl2) { return racl1->user_obj == racl2->user_obj && racl1->group_obj == racl2->group_obj && racl1->mask_obj == racl2->mask_obj && racl1->other_obj == racl2->other_obj && ida_entries_equal(&racl1->names, &racl2->names); } /* Are the extended (non-permission-bit) entries equal? If so, the rest of * the ACL will be handled by the normal mode-preservation code. This is * only meaningful for access ACLs! Note: the 1st arg is a fully-populated * rsync_acl, but the 2nd parameter can be a condensed rsync_acl, which means * that it might have several of its permission objects set to NO_ENTRY. */ static BOOL rsync_acl_equal_enough(const rsync_acl *racl1, const rsync_acl *racl2, mode_t m) { if ((racl1->mask_obj ^ racl2->mask_obj) & NO_ENTRY) return False; /* One has a mask and the other doesn't */ /* When there's a mask, the group_obj becomes an extended entry. */ if (racl1->mask_obj != NO_ENTRY) { /* A condensed rsync_acl with a mask can only have no * group_obj when it was identical to the mask. This * means that it was also identical to the group attrs * from the mode. */ if (racl2->group_obj == NO_ENTRY) { if (racl1->group_obj != ((m >> 3) & 7)) return False; } else if (racl1->group_obj != racl2->group_obj) return False; } return ida_entries_equal(&racl1->names, &racl2->names); } static void rsync_acl_free(rsync_acl *racl) { if (racl->names.idas) free(racl->names.idas); *racl = empty_rsync_acl; } void free_acl(stat_x *sxp) { if (sxp->acc_acl) { rsync_acl_free(sxp->acc_acl); free(sxp->acc_acl); sxp->acc_acl = NULL; } if (sxp->def_acl) { rsync_acl_free(sxp->def_acl); free(sxp->def_acl); sxp->def_acl = NULL; } } #ifdef SMB_ACL_NEED_SORT static int id_access_sorter(const void *r1, const void *r2) { id_access *ida1 = (id_access *)r1; id_access *ida2 = (id_access *)r2; id_t rid1 = ida1->id, rid2 = ida2->id; if ((ida1->access ^ ida2->access) & NAME_IS_USER) return ida1->access & NAME_IS_USER ? -1 : 1; return rid1 == rid2 ? 0 : rid1 < rid2 ? -1 : 1; } #endif /* === System ACLs === */ /* Unpack system ACL -> rsync ACL verbatim. Return whether we succeeded. */ static BOOL unpack_smb_acl(SMB_ACL_T sacl, rsync_acl *racl) { static item_list temp_ida_list = EMPTY_ITEM_LIST; SMB_ACL_ENTRY_T entry; const char *errfun; int rc; errfun = "sys_acl_get_entry"; for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry); rc == 1; rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) { SMB_ACL_TAG_T tag_type; uint32 access; id_t g_u_id; id_access *ida; if ((rc = sys_acl_get_info(entry, &tag_type, &access, &g_u_id)) != 0) { errfun = "sys_acl_get_info"; break; } /* continue == done with entry; break == store in temporary ida list */ switch (tag_type) { #ifndef HAVE_OSX_ACLS case SMB_ACL_USER_OBJ: if (racl->user_obj == NO_ENTRY) racl->user_obj = access; else rprintf(FINFO, "unpack_smb_acl: warning: duplicate USER_OBJ entry ignored\n"); continue; case SMB_ACL_GROUP_OBJ: if (racl->group_obj == NO_ENTRY) racl->group_obj = access; else rprintf(FINFO, "unpack_smb_acl: warning: duplicate GROUP_OBJ entry ignored\n"); continue; case SMB_ACL_MASK: if (racl->mask_obj == NO_ENTRY) racl->mask_obj = access; else rprintf(FINFO, "unpack_smb_acl: warning: duplicate MASK entry ignored\n"); continue; case SMB_ACL_OTHER: if (racl->other_obj == NO_ENTRY) racl->other_obj = access; else rprintf(FINFO, "unpack_smb_acl: warning: duplicate OTHER entry ignored\n"); continue; #endif case SMB_ACL_USER: access |= NAME_IS_USER; break; case SMB_ACL_GROUP: break; default: rprintf(FINFO, "unpack_smb_acl: warning: entry with unrecognized tag type ignored\n"); continue; } ida = EXPAND_ITEM_LIST(&temp_ida_list, id_access, -10); ida->id = g_u_id; ida->access = access; } if (rc) { rsyserr(FERROR_XFER, errno, "unpack_smb_acl: %s()", errfun); rsync_acl_free(racl); return False; } /* Transfer the count id_access items out of the temp_ida_list * into the names ida_entries list in racl. */ if (temp_ida_list.count) { #ifdef SMB_ACL_NEED_SORT if (temp_ida_list.count > 1) { qsort(temp_ida_list.items, temp_ida_list.count, sizeof (id_access), id_access_sorter); } #endif racl->names.idas = new_array(id_access, temp_ida_list.count); memcpy(racl->names.idas, temp_ida_list.items, temp_ida_list.count * sizeof (id_access)); } else racl->names.idas = NULL; racl->names.count = temp_ida_list.count; /* Truncate the temporary list now that its idas have been saved. */ temp_ida_list.count = 0; return True; } /* Synactic sugar for system calls */ #define CALL_OR_ERROR(func,args,str) \ do { \ if (func args) { \ errfun = str; \ goto error_exit; \ } \ } while (0) #define COE(func,args) CALL_OR_ERROR(func,args,#func) #define COE2(func,args) CALL_OR_ERROR(func,args,NULL) #ifndef HAVE_OSX_ACLS /* Store the permissions in the system ACL entry. */ static int store_access_in_entry(uint32 access, SMB_ACL_ENTRY_T entry) { if (sys_acl_set_access_bits(entry, access)) { rsyserr(FERROR_XFER, errno, "store_access_in_entry sys_acl_set_access_bits()"); return -1; } return 0; } #endif /* Pack rsync ACL -> system ACL verbatim. Return whether we succeeded. */ static BOOL pack_smb_acl(SMB_ACL_T *smb_acl, const rsync_acl *racl) { #ifdef ACLS_NEED_MASK uchar mask_bits; #endif size_t count; id_access *ida; const char *errfun = NULL; SMB_ACL_ENTRY_T entry; if (!(*smb_acl = sys_acl_init(calc_sacl_entries(racl)))) { rsyserr(FERROR_XFER, errno, "pack_smb_acl: sys_acl_init()"); return False; } #ifndef HAVE_OSX_ACLS COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_USER_OBJ, racl->user_obj & ~NO_ENTRY, 0) ); #endif for (ida = racl->names.idas, count = racl->names.count; count; ida++, count--) { #ifdef SMB_ACL_NEED_SORT if (!(ida->access & NAME_IS_USER)) break; #endif COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info, (entry, ida->access & NAME_IS_USER ? SMB_ACL_USER : SMB_ACL_GROUP, ida->access & ~NAME_IS_USER, ida->id) ); } #ifndef HAVE_OSX_ACLS COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_GROUP_OBJ, racl->group_obj & ~NO_ENTRY, 0) ); #ifdef SMB_ACL_NEED_SORT for ( ; count; ida++, count--) { COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_GROUP, ida->access, ida->id) ); } #endif #ifdef ACLS_NEED_MASK mask_bits = racl->mask_obj == NO_ENTRY ? racl->group_obj & ~NO_ENTRY : racl->mask_obj; COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_MASK, mask_bits, 0) ); #else if (racl->mask_obj != NO_ENTRY) { COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_MASK, racl->mask_obj, 0) ); } #endif COE( sys_acl_create_entry,(smb_acl, &entry) ); COE( sys_acl_set_info,(entry, SMB_ACL_OTHER, racl->other_obj & ~NO_ENTRY, 0) ); #endif #ifdef DEBUG if (sys_acl_valid(*smb_acl) < 0) rprintf(FERROR_XFER, "pack_smb_acl: warning: system says the ACL I packed is invalid\n"); #endif return True; error_exit: if (errfun) { rsyserr(FERROR_XFER, errno, "pack_smb_acl %s()", errfun); } sys_acl_free_acl(*smb_acl); return False; } static int find_matching_rsync_acl(const rsync_acl *racl, SMB_ACL_TYPE_T type, const item_list *racl_list) { static int access_match = -1, default_match = -1; int *match = type == SMB_ACL_TYPE_ACCESS ? &access_match : &default_match; size_t count = racl_list->count; /* If this is the first time through or we didn't match the last * time, then start at the end of the list, which should be the * best place to start hunting. */ if (*match == -1) *match = racl_list->count - 1; while (count--) { rsync_acl *base = racl_list->items; if (rsync_acl_equal(base + *match, racl)) return *match; if (!(*match)--) *match = racl_list->count - 1; } *match = -1; return *match; } /* These two bridge lib/acl.c's neutral (tag,perm,id) entry array; with * HAVE_LIBACL_AT the libacl *_at path uses unpack_smb_acl/pack_smb_acl directly, * so they are unused there. */ #if defined(SUPPORT_ACL_FD) && !defined(HAVE_LIBACL_AT) /* Convert a packed system ACL into the neutral (tag,perm,id) entry array that * lib/acl.c serializes. Reuses pack_smb_acl()+change_sacl_perms() output so * the bytes we write match exactly what acl_set_file() would have written. * Returns the entry count and a malloc'd array in *ents_p, or -1 on error. */ static int sacl_to_entries(SMB_ACL_T sacl, rsync_acl_ent **ents_p) { static item_list ent_list = EMPTY_ITEM_LIST; SMB_ACL_ENTRY_T entry; rsync_acl_ent *out; int rc; ent_list.count = 0; for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry); rc == 1; rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) { SMB_ACL_TAG_T tag_type; uint32 access; id_t g_u_id; rsync_acl_ent *e; uint16_t tag; if ((rc = sys_acl_get_info(entry, &tag_type, &access, &g_u_id)) != 0) break; switch (tag_type) { case SMB_ACL_USER_OBJ: tag = RACL_USER_OBJ; break; case SMB_ACL_USER: tag = RACL_USER; break; case SMB_ACL_GROUP_OBJ: tag = RACL_GROUP_OBJ; break; case SMB_ACL_GROUP: tag = RACL_GROUP; break; case SMB_ACL_MASK: tag = RACL_MASK; break; case SMB_ACL_OTHER: tag = RACL_OTHER; break; default: continue; /* skip an unrecognized tag */ } e = EXPAND_ITEM_LIST(&ent_list, rsync_acl_ent, -10); e->tag = tag; e->perm = access & 7; e->id = (tag == RACL_USER || tag == RACL_GROUP) ? (uint32_t)g_u_id : RACL_UNDEFINED_ID; } if (rc) { rsyserr(FERROR_XFER, errno, "sacl_to_entries: sys_acl_get_entry/info()"); return -1; } out = new_array(rsync_acl_ent, ent_list.count ? ent_list.count : 1); if (ent_list.count) memcpy(out, ent_list.items, ent_list.count * sizeof (rsync_acl_ent)); *ents_p = out; return ent_list.count; } /* Unpack a neutral entry array (from lib/acl.c) into an rsync_acl, mirroring * unpack_smb_acl()'s tag handling. */ static BOOL unpack_acl_entries(const rsync_acl_ent *ents, int n, rsync_acl *racl) { static item_list temp_ida_list = EMPTY_ITEM_LIST; int i; temp_ida_list.count = 0; for (i = 0; i < n; i++) { uint32 access = ents[i].perm & 7; id_access *ida; switch (ents[i].tag) { case RACL_USER_OBJ: if (racl->user_obj == NO_ENTRY) racl->user_obj = access; continue; case RACL_GROUP_OBJ: if (racl->group_obj == NO_ENTRY) racl->group_obj = access; continue; case RACL_MASK: if (racl->mask_obj == NO_ENTRY) racl->mask_obj = access; continue; case RACL_OTHER: if (racl->other_obj == NO_ENTRY) racl->other_obj = access; continue; case RACL_USER: access |= NAME_IS_USER; break; case RACL_GROUP: break; default: continue; } ida = EXPAND_ITEM_LIST(&temp_ida_list, id_access, -10); ida->id = ents[i].id; ida->access = access; } if (temp_ida_list.count) { #ifdef SMB_ACL_NEED_SORT if (temp_ida_list.count > 1) qsort(temp_ida_list.items, temp_ida_list.count, sizeof (id_access), id_access_sorter); #endif racl->names.idas = new_array(id_access, temp_ida_list.count); memcpy(racl->names.idas, temp_ida_list.items, temp_ida_list.count * sizeof (id_access)); } else racl->names.idas = NULL; racl->names.count = temp_ida_list.count; temp_ida_list.count = 0; return True; } #endif /* SUPPORT_ACL_FD */ static int get_rsync_acl(int fd, int dirfd, const char *leaf, const char *fname, rsync_acl *racl, SMB_ACL_TYPE_T type, mode_t mode) { SMB_ACL_T sacl; #ifndef SUPPORT_ACL_FD #ifndef HAVE_SOLARIS_ACLS (void)fd; /* Solaris drives the ACL via facl(2) on fd but has no SUPPORT_ACL_FD. */ #endif (void)dirfd; (void)leaf; #endif #ifdef SUPPORT_XATTRS /* --fake-super support: load ACLs from an xattr. */ if (am_root < 0) { char *buf; size_t len; int cnt; if ((buf = get_xattr_acl(fname, fd, type == SMB_ACL_TYPE_ACCESS, &len)) == NULL) return 0; cnt = (len - 4*4) / (4+4); if (len < 4*4 || len != (size_t)cnt*(4+4) + 4*4) { free(buf); return -1; } racl->user_obj = IVAL(buf, 0); if (racl->user_obj == NO_ENTRY) racl->user_obj = (mode >> 6) & 7; racl->group_obj = IVAL(buf, 4); if (racl->group_obj == NO_ENTRY) racl->group_obj = (mode >> 3) & 7; racl->mask_obj = IVAL(buf, 8); racl->other_obj = IVAL(buf, 12); if (racl->other_obj == NO_ENTRY) racl->other_obj = mode & 7; if (cnt) { char *bp = buf + 4*4; id_access *ida = racl->names.idas = new_array(id_access, cnt); racl->names.count = cnt; for ( ; cnt--; ida++, bp += 4+4) { ida->id = IVAL(bp, 0); ida->access = IVAL(bp, 4); } } free(buf); return 0; } #endif #ifdef HAVE_SOLARIS_ACLS /* Solaris has no libacl *_at; read the ACL through the held fd via facl(2) * when we have one. With no held fd this branch is skipped and the path-based * call below reads the ACL (acceptable: a read can't redirect a write out of * the tree). */ if (fd >= 0) { if ((sacl = sys_acl_get_fd_type(fd, type)) != 0) { BOOL ok = unpack_smb_acl(sacl, racl); sys_acl_free_acl(sacl); if (!ok) { rsyserr(FERROR_XFER, errno, "get_acl: unpack_smb_acl(%s)", fname); return -1; } return 0; } if (no_acl_syscall_error(errno)) { if (type == SMB_ACL_TYPE_ACCESS) rsync_acl_fake_perms(racl, mode); return 0; } rsyserr(FERROR_XFER, errno, "get_acl: sys_acl_get_fd_type(%s, %s)", fname, str_acl_type(type)); return -1; } #endif #ifdef SUPPORT_ACL_FD #ifdef HAVE_LIBACL_AT /* Read the ACL via the new libacl *_at calls; fd<0 && dirfd<0 * (e.g. a synthetic dir) falls through to the path-based call below. */ if (fd >= 0 || dirfd >= 0) { if (fd >= 0) sacl = sys_acl_get_file_at(fd, "", AT_EMPTY_PATH, type); else sacl = sys_acl_get_file_at(dirfd, leaf, AT_SYMLINK_NOFOLLOW, type); if (sacl != 0) { BOOL ok = unpack_smb_acl(sacl, racl); sys_acl_free_acl(sacl); if (!ok) { rsyserr(FERROR_XFER, errno, "get_acl: unpack_smb_acl(%s)", fname); return -1; } return 0; } if (no_acl_syscall_error(errno)) { if (type == SMB_ACL_TYPE_ACCESS) rsync_acl_fake_perms(racl, mode); return 0; } rsyserr(FERROR_XFER, errno, "get_acl: acl_get_file_at(%s, %s)", fname, str_acl_type(type)); return -1; } #else /* Race-safe path: read the ACL through the held O_NOFOLLOW fd, or via * setxattrat(AT_SYMLINK_NOFOLLOW) on dirfd+leaf, instead of re-resolving * fname. Only for real-root ACLs (am_root >= 0; the fake-super branch * above already returned). */ if (fd >= 0 || (dirfd >= 0 && xacl_at_available())) { int is_def = type == SMB_ACL_TYPE_DEFAULT; rsync_acl_ent *ents = NULL; int n = 0, rc; if (fd >= 0) rc = xacl_get_fd(fd, is_def, &ents, &n); else rc = xacl_get_at(dirfd, leaf, is_def, &ents, &n); if (rc < 0) { if (no_acl_syscall_error(errno)) { if (type == SMB_ACL_TYPE_ACCESS) rsync_acl_fake_perms(racl, mode); return 0; } rsyserr(FERROR_XFER, errno, "get_acl: xacl_get(%s, %s)", fname, str_acl_type(type)); return -1; } if (n == 0) { /* No explicit ACL: mirror libacl's mode-derived access ACL * (an absent default ACL stays empty). */ if (type == SMB_ACL_TYPE_ACCESS) rsync_acl_fake_perms(racl, mode); } else if (!unpack_acl_entries(ents, n, racl)) { if (ents) free(ents); rsyserr(FERROR_XFER, errno, "get_acl: unpack_acl_entries(%s)", fname); return -1; } if (ents) free(ents); return 0; } /* Neither a held fd nor a usable dirfd path (xacl_at_available() covers the * *xattrat syscalls AND the pre-6.13 /proc/self/fd compat, so this is the * BSDs / a /proc-less namespace / an un-pinnable entry): read the real * destination ACL via the path-based call rather than a mode-only fake, so * --acls stays functional where the race-safe primitive is unavailable. */ #endif /* HAVE_LIBACL_AT */ #endif if ((sacl = sys_acl_get_file(fname, type)) != 0) { BOOL ok = unpack_smb_acl(sacl, racl); sys_acl_free_acl(sacl); if (!ok) { rsyserr(FERROR_XFER, errno, "get_acl: unpack_smb_acl(%s)", fname); return -1; } } else if (no_acl_syscall_error(errno)) { /* ACLs are not supported, so pretend we have a basic ACL. */ if (type == SMB_ACL_TYPE_ACCESS) rsync_acl_fake_perms(racl, mode); } else { rsyserr(FERROR_XFER, errno, "get_acl: sys_acl_get_file(%s, %s)", fname, str_acl_type(type)); return -1; } return 0; } /* Return the Access Control List for the given filename. When a held * O_NOFOLLOW fd (or a dirfd+leaf) is available, the ACL is read race-safely * through it; otherwise (fd < 0 && dirfd < 0) the path-based fallback is used. */ int get_acl_fdat(int fd, int dirfd, const char *leaf, const char *fname, stat_x *sxp) { sxp->acc_acl = create_racl(); if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) { /* Everyone supports this. */ } else if (S_ISLNK(sxp->st.st_mode)) { return 0; } else if (IS_SPECIAL(sxp->st.st_mode)) { #ifndef NO_SPECIAL_ACLS if (!preserve_specials) #endif return 0; } else if (IS_DEVICE(sxp->st.st_mode)) { #ifndef NO_DEVICE_ACLS if (!preserve_devices) #endif return 0; } else if (IS_MISSING_FILE(sxp->st)) return 0; if (get_rsync_acl(fd, dirfd, leaf, fname, sxp->acc_acl, SMB_ACL_TYPE_ACCESS, sxp->st.st_mode) < 0) { free_acl(sxp); return -1; } if (S_ISDIR(sxp->st.st_mode)) { sxp->def_acl = create_racl(); if (get_rsync_acl(fd, dirfd, leaf, fname, sxp->def_acl, SMB_ACL_TYPE_DEFAULT, sxp->st.st_mode) < 0) { free_acl(sxp); return -1; } } return 0; } int get_acl(const char *fname, stat_x *sxp) { return get_acl_fdat(-1, -1, NULL, fname, sxp); } /* === Send functions === */ /* Send the ida list over the file descriptor. */ static void send_ida_entries(int f, const ida_entries *idal) { id_access *ida; size_t count = idal->count; write_varint(f, idal->count); for (ida = idal->idas; count--; ida++) { uint32 xbits = ida->access << 2; const char *name; if (ida->access & NAME_IS_USER) { xbits |= XFLAG_NAME_IS_USER; name = numeric_ids ? NULL : add_uid(ida->id); } else name = numeric_ids ? NULL : add_gid(ida->id); write_varint(f, ida->id); if (inc_recurse && name) { int len = strlen(name); write_varint(f, xbits | XFLAG_NAME_FOLLOWS); write_byte(f, len); write_buf(f, name, len); } else write_varint(f, xbits); } } static void send_rsync_acl(int f, rsync_acl *racl, SMB_ACL_TYPE_T type, item_list *racl_list) { int ndx = find_matching_rsync_acl(racl, type, racl_list); /* Send 0 (-1 + 1) to indicate that literal ACL data follows. */ write_varint(f, ndx + 1); if (ndx < 0) { rsync_acl *new_racl = EXPAND_ITEM_LIST(racl_list, rsync_acl, 1000); uchar flags = 0; if (racl->user_obj != NO_ENTRY) flags |= XMIT_USER_OBJ; if (racl->group_obj != NO_ENTRY) flags |= XMIT_GROUP_OBJ; if (racl->mask_obj != NO_ENTRY) flags |= XMIT_MASK_OBJ; if (racl->other_obj != NO_ENTRY) flags |= XMIT_OTHER_OBJ; if (racl->names.count) flags |= XMIT_NAME_LIST; write_byte(f, flags); if (flags & XMIT_USER_OBJ) write_varint(f, racl->user_obj); if (flags & XMIT_GROUP_OBJ) write_varint(f, racl->group_obj); if (flags & XMIT_MASK_OBJ) write_varint(f, racl->mask_obj); if (flags & XMIT_OTHER_OBJ) write_varint(f, racl->other_obj); if (flags & XMIT_NAME_LIST) send_ida_entries(f, &racl->names); /* Give the allocated data to the new list object. */ *new_racl = *racl; *racl = empty_rsync_acl; } } /* Send the ACL from the stat_x structure down the indicated file descriptor. * This also frees the ACL data. */ void send_acl(int f, stat_x *sxp) { if (!sxp->acc_acl) { sxp->acc_acl = create_racl(); rsync_acl_fake_perms(sxp->acc_acl, sxp->st.st_mode); } /* Avoid sending values that can be inferred from other data. */ rsync_acl_strip_perms(sxp); send_rsync_acl(f, sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list); if (S_ISDIR(sxp->st.st_mode)) { if (!sxp->def_acl) sxp->def_acl = create_racl(); send_rsync_acl(f, sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list); } } /* === Receive functions === */ static uint32 recv_acl_access(int f, uchar *name_follows_ptr) { uint32 access = read_varint(f); if (name_follows_ptr) { int flags = access & 3; access >>= 2; if (am_root >= 0 && access & ~SMB_ACL_VALID_NAME_BITS) goto value_error; if (flags & XFLAG_NAME_FOLLOWS) *name_follows_ptr = 1; else *name_follows_ptr = 0; if (flags & XFLAG_NAME_IS_USER) access |= NAME_IS_USER; } else if (am_root >= 0 && access & ~SMB_ACL_VALID_OBJ_BITS) { value_error: rprintf(FERROR_XFER, "recv_acl_access: value out of range: %x\n", access); exit_cleanup(RERR_STREAMIO); } return access; } static uchar recv_ida_entries(int f, ida_entries *ent) { uchar computed_mask_bits = 0; int i, count = read_varint_bounded(f, 0, MAX_WIRE_ACL_COUNT, "ACL count"); ent->idas = count ? new_array(id_access, count) : NULL; ent->count = count; for (i = 0; i < count; i++) { uchar has_name; id_t id = read_varint(f); uint32 access = recv_acl_access(f, &has_name); if (has_name) { if (access & NAME_IS_USER) id = recv_user_name(f, id); else id = recv_group_name(f, id, NULL); } else if (access & NAME_IS_USER) { if (inc_recurse && !numeric_ids) id = match_uid(id); } else { if (inc_recurse && (!am_root || !numeric_ids)) id = match_gid(id, NULL); } ent->idas[i].id = id; ent->idas[i].access = access; computed_mask_bits |= access; } return computed_mask_bits & ~NO_ENTRY; } static int recv_rsync_acl(int f, item_list *racl_list, SMB_ACL_TYPE_T type, mode_t mode) { uchar computed_mask_bits = 0; acl_duo *duo_item; uchar flags; int ndx = read_varint(f); if (ndx < 0 || (size_t)ndx > racl_list->count) { rprintf(FERROR_XFER, "recv_acl_index: %s ACL index %d > %d\n", str_acl_type(type), ndx, (int)racl_list->count); exit_cleanup(RERR_STREAMIO); } if (ndx != 0) return ndx - 1; ndx = racl_list->count; duo_item = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000); duo_item->racl = empty_rsync_acl; flags = read_byte(f); if (flags & XMIT_USER_OBJ) duo_item->racl.user_obj = recv_acl_access(f, NULL); if (flags & XMIT_GROUP_OBJ) duo_item->racl.group_obj = recv_acl_access(f, NULL); if (flags & XMIT_MASK_OBJ) duo_item->racl.mask_obj = recv_acl_access(f, NULL); if (flags & XMIT_OTHER_OBJ) duo_item->racl.other_obj = recv_acl_access(f, NULL); if (flags & XMIT_NAME_LIST) computed_mask_bits |= recv_ida_entries(f, &duo_item->racl.names); #ifdef HAVE_OSX_ACLS /* If we received a superfluous mask, throw it away. */ duo_item->racl.mask_obj = NO_ENTRY; (void)mode; (void)computed_mask_bits; #else if (duo_item->racl.names.count && duo_item->racl.mask_obj == NO_ENTRY) { /* Mask must be non-empty with lists. */ if (type == SMB_ACL_TYPE_ACCESS) computed_mask_bits = (mode >> 3) & 7; else computed_mask_bits |= duo_item->racl.group_obj & ~NO_ENTRY; duo_item->racl.mask_obj = computed_mask_bits; } #endif duo_item->sacl = NULL; return ndx; } /* Receive the ACL info the sender has included for this file-list entry. */ void receive_acl(int f, struct file_struct *file) { F_ACL(file) = recv_rsync_acl(f, &access_acl_list, SMB_ACL_TYPE_ACCESS, file->mode); if (S_ISDIR(file->mode)) F_DIR_DEFACL(file) = recv_rsync_acl(f, &default_acl_list, SMB_ACL_TYPE_DEFAULT, 0); } static int cache_rsync_acl(rsync_acl *racl, SMB_ACL_TYPE_T type, item_list *racl_list) { int ndx; if (!racl) ndx = -1; else if ((ndx = find_matching_rsync_acl(racl, type, racl_list)) == -1) { acl_duo *new_duo; ndx = racl_list->count; new_duo = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000); new_duo->racl = *racl; new_duo->sacl = NULL; *racl = empty_rsync_acl; } return ndx; } /* Turn the ACL data in stat_x into cached ACL data, setting the index * values in the file struct. */ void cache_tmp_acl(struct file_struct *file, stat_x *sxp) { if (prior_access_count == (size_t)-1) prior_access_count = access_acl_list.count; F_ACL(file) = cache_rsync_acl(sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list); if (S_ISDIR(sxp->st.st_mode)) { if (prior_default_count == (size_t)-1) prior_default_count = default_acl_list.count; F_DIR_DEFACL(file) = cache_rsync_acl(sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list); } } static void uncache_duo_acls(item_list *duo_list, size_t start) { acl_duo *duo_item = duo_list->items; acl_duo *duo_start = duo_item + start; duo_item += duo_list->count; duo_list->count = start; while (duo_item-- > duo_start) { rsync_acl_free(&duo_item->racl); if (duo_item->sacl) sys_acl_free_acl(duo_item->sacl); } } void uncache_tmp_acls(void) { if (prior_access_count != (size_t)-1) { uncache_duo_acls(&access_acl_list, prior_access_count); prior_access_count = (size_t)-1; } if (prior_default_count != (size_t)-1) { uncache_duo_acls(&default_acl_list, prior_default_count); prior_default_count = (size_t)-1; } } #ifndef HAVE_OSX_ACLS static mode_t change_sacl_perms(SMB_ACL_T sacl, rsync_acl *racl, mode_t old_mode, mode_t mode) { SMB_ACL_ENTRY_T entry; const char *errfun; int rc; if (S_ISDIR(mode)) { /* If the sticky bit is going on, it's not safe to allow all * the new ACL to go into effect before it gets set. */ #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS if (mode & S_ISVTX) mode &= ~0077; #else if (mode & S_ISVTX && !(old_mode & S_ISVTX)) mode &= ~0077; } else { /* If setuid or setgid is going off, it's not safe to allow all * the new ACL to go into effect before they get cleared. */ if ((old_mode & S_ISUID && !(mode & S_ISUID)) || (old_mode & S_ISGID && !(mode & S_ISGID))) mode &= ~0077; #endif } errfun = "sys_acl_get_entry"; for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry); rc == 1; rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) { SMB_ACL_TAG_T tag_type; if ((rc = sys_acl_get_tag_type(entry, &tag_type)) != 0) { errfun = "sys_acl_get_tag_type"; break; } switch (tag_type) { case SMB_ACL_USER_OBJ: COE2( store_access_in_entry,((mode >> 6) & 7, entry) ); break; case SMB_ACL_GROUP_OBJ: /* group is only empty when identical to group perms. */ if (racl->group_obj != NO_ENTRY) break; COE2( store_access_in_entry,((mode >> 3) & 7, entry) ); break; case SMB_ACL_MASK: #ifndef HAVE_SOLARIS_ACLS #ifndef ACLS_NEED_MASK /* mask is only empty when we don't need it. */ if (racl->mask_obj == NO_ENTRY) break; #endif COE2( store_access_in_entry,((mode >> 3) & 7, entry) ); #endif break; case SMB_ACL_OTHER: COE2( store_access_in_entry,(mode & 7, entry) ); break; } } if (rc) { error_exit: if (errfun) { rsyserr(FERROR_XFER, errno, "change_sacl_perms: %s()", errfun); } return (mode_t)-1; } #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS /* Ensure that chmod() will be called to restore any lost setid bits. */ if (old_mode & (S_ISUID | S_ISGID | S_ISVTX) && BITS_EQUAL(old_mode, mode, CHMOD_BITS)) old_mode &= ~(S_ISUID | S_ISGID | S_ISVTX); #endif /* Return the mode of the file on disk, as we will set them. */ return (old_mode & ~ACCESSPERMS) | (mode & ACCESSPERMS); } #endif static int set_rsync_acl(int fd, int dirfd, const char *leaf, const char *fname, acl_duo *duo_item, SMB_ACL_TYPE_T type, stat_x *sxp, mode_t mode) { #ifndef SUPPORT_ACL_FD #ifndef HAVE_SOLARIS_ACLS (void)fd; /* Solaris drives the ACL via facl(2) on fd but has no SUPPORT_ACL_FD. */ #endif (void)dirfd; (void)leaf; #endif if (type == SMB_ACL_TYPE_DEFAULT && duo_item->racl.user_obj == NO_ENTRY) { int rc; #ifdef SUPPORT_XATTRS /* --fake-super support: delete default ACL from xattrs. */ if (am_root < 0) rc = del_def_xattr_acl(fd, fname); else #endif #ifdef SUPPORT_ACL_FD #ifdef HAVE_LIBACL_AT /* Race-safe default-ACL delete via the new libacl *_at * calls (held fd via AT_EMPTY_PATH, dirfd+leaf via AT_SYMLINK_NOFOLLOW) * -- race-safe on every Linux kernel. fd<0 && dirfd<0 falls to path. */ if (fd >= 0) rc = sys_acl_delete_def_file_at(fd, "", AT_EMPTY_PATH); else if (dirfd >= 0) rc = sys_acl_delete_def_file_at(dirfd, leaf, AT_SYMLINK_NOFOLLOW); else #else /* Race-safe default-ACL delete via the held fd or dirfd+leaf. Where * neither is available (xacl_at_available() is false -- the BSDs, a * /proc-less namespace, an un-pinnable entry; every Linux with procfs * takes the dirfd path via *xattrat or the /proc/self/fd compat) -- fall * back to the path-based call, preferring the documented --acls behaviour * over refusing it where the race-safe primitive is unavailable. */ if (fd >= 0) rc = xacl_del_default_fd(fd); else if (dirfd >= 0 && xacl_at_available()) rc = xacl_del_default_at(dirfd, leaf); else #endif /* HAVE_LIBACL_AT */ #endif #ifdef HAVE_SOLARIS_ACLS /* Solaris: delete the default ACL through the held fd via facl(2). For a * root receiver a missing held fd means the leaf was raced, so refuse rather * than let the path-based delete follow it; a plain non-root receiver keeps * the legacy path fallback (op_pin am_root != 0 rule). */ if (fd >= 0) rc = sys_acl_delete_def_fd(fd); else if (secure_relpath_active() && am_root) { errno = ELOOP; rc = -1; } else #endif rc = sys_acl_delete_def_file(fname); if (rc < 0) { rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_delete_def_file(%s)", fname); return -1; } #ifdef SUPPORT_XATTRS } else if (am_root < 0) { /* --fake-super support: store ACLs in an xattr. */ int cnt = duo_item->racl.names.count; size_t len = 4*4 + cnt * (4+4); char *buf = new_array(char, len); int rc; SIVAL(buf, 0, duo_item->racl.user_obj); SIVAL(buf, 4, duo_item->racl.group_obj); SIVAL(buf, 8, duo_item->racl.mask_obj); SIVAL(buf, 12, duo_item->racl.other_obj); if (cnt) { char *bp = buf + 4*4; id_access *ida = duo_item->racl.names.idas; for ( ; cnt--; ida++, bp += 4+4) { SIVAL(bp, 0, ida->id); SIVAL(bp, 4, ida->access); } } rc = set_xattr_acl(fd, fname, type == SMB_ACL_TYPE_ACCESS, buf, len); free(buf); return rc; #endif } else { mode_t cur_mode = sxp->st.st_mode; if (!duo_item->sacl && !pack_smb_acl(&duo_item->sacl, &duo_item->racl)) return -1; #ifdef HAVE_OSX_ACLS (void)mode; /* eliminate compiler warning */ #else if (type == SMB_ACL_TYPE_ACCESS) { cur_mode = change_sacl_perms(duo_item->sacl, &duo_item->racl, cur_mode, mode); if (cur_mode == (mode_t)-1) return 0; } #endif #ifdef SUPPORT_ACL_FD #ifdef HAVE_LIBACL_AT /* Apply the packed/perm-reconciled ACL (duo_item->sacl) * through the new libacl *_at calls -- held fd via AT_EMPTY_PATH, * dirfd+leaf via AT_SYMLINK_NOFOLLOW -- race-safe on every Linux kernel, * and byte-identical to the path-based sys_acl_set_file() below. */ if (fd >= 0 || dirfd >= 0) { int rc; if (fd >= 0) rc = sys_acl_set_file_at(fd, "", AT_EMPTY_PATH, type, duo_item->sacl); else rc = sys_acl_set_file_at(dirfd, leaf, AT_SYMLINK_NOFOLLOW, type, duo_item->sacl); if (rc < 0) { rsyserr(FERROR_XFER, errno, "set_acl: acl_set_file_at(%s, %s)", fname, str_acl_type(type)); return -1; } if (type == SMB_ACL_TYPE_ACCESS) sxp->st.st_mode = cur_mode; return 0; } #else /* Race-safe write: serialize the packed (and perm-reconciled) * system ACL to the kernel xattr format and apply it through the * held fd or dirfd+leaf -- never re-resolving fname. This matches * exactly what sys_acl_set_file() would have written. */ if (fd >= 0 || (dirfd >= 0 && xacl_at_available())) { int is_def = type == SMB_ACL_TYPE_DEFAULT; rsync_acl_ent *ents; int n = sacl_to_entries(duo_item->sacl, &ents); int rc; if (n < 0) return -1; if (fd >= 0) rc = xacl_set_fd(fd, is_def, ents, n); else rc = xacl_set_at(dirfd, leaf, is_def, ents, n); free(ents); if (rc < 0) { rsyserr(FERROR_XFER, errno, "set_acl: xacl_set(%s, %s)", fname, str_acl_type(type)); return -1; } if (type == SMB_ACL_TYPE_ACCESS) sxp->st.st_mode = cur_mode; return 0; } /* No held fd and no usable dirfd path (xacl_at_available() is false -- * the BSDs, a /proc-less namespace, an un-pinnable entry; every Linux * with procfs took xacl_set_at() above via *xattrat or the /proc/self/fd * compat): prefer the documented --acls behaviour over refusing it and * fall back to the path-based set. This re-resolves fname, so it still * carries the parent-symlink-race exposure on those remaining platforms; * it is the only way to honour --acls where no race-safe primitive * exists. */ #endif /* HAVE_LIBACL_AT */ #endif #ifdef HAVE_SOLARIS_ACLS /* Solaris: apply the ACL through the held fd via facl(2). */ if (fd >= 0) { if (sys_acl_set_fd_type(fd, type, duo_item->sacl) < 0) { rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_set_fd_type(%s, %s)", fname, str_acl_type(type)); return -1; } if (type == SMB_ACL_TYPE_ACCESS) sxp->st.st_mode = cur_mode; return 0; } if (secure_relpath_active() && am_root) { /* Real root always can open its own freshly-staged reg/dir/fifo leaf, * so a missing held fd on a confined receiver means the leaf was raced * to a symlink; sys_acl_set_file() follows the leaf, so refuse rather * than write the attacker-supplied ACL onto a redirected inode (covers * the top-level no-slash entry the caller's slashed-path xattr_refuse * gate misses). A plain non-root receiver keeps the path-based fallback * for a legitimately un-pinnable owned leaf (e.g. a 0300 dir), matching * the operator-path op_pin rule (am_root != 0). */ errno = ELOOP; rsyserr(FERROR_XFER, errno, "set_acl: refusing path-based ACL on %s (no held fd)", fname); return -1; } #endif if (sys_acl_set_file(fname, type, duo_item->sacl) < 0) { rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_set_file(%s, %s)", fname, str_acl_type(type)); return -1; } if (type == SMB_ACL_TYPE_ACCESS) sxp->st.st_mode = cur_mode; } return 0; } /* Given a fname, this sets extended access ACL entries, the default ACL (for a * dir), and the regular mode bits on the file. Call this with fname set to * NULL to just check if the ACL is different. * * When a held O_NOFOLLOW fd (or a dirfd+leaf) is supplied, the ACL is applied * race-safely through it; otherwise (fd < 0 && dirfd < 0) the path-based * fallback is used. * * If the ACL operation has a side-effect of changing the file's mode, the * sxp->st.st_mode value will be changed to match. * * Returns 0 for an unchanged ACL, 1 for changed, -1 for failed. */ int set_acl_fdat(int fd, int dirfd, const char *leaf, const char *fname, const struct file_struct *file, stat_x *sxp, mode_t new_mode) { int changed = 0; int32 ndx; BOOL eq; if (!dry_run && (read_only || list_only)) { errno = EROFS; return -1; } ndx = F_ACL(file); if (ndx >= 0 && (size_t)ndx < access_acl_list.count) { acl_duo *duo_item = access_acl_list.items; duo_item += ndx; eq = sxp->acc_acl && rsync_acl_equal_enough(sxp->acc_acl, &duo_item->racl, new_mode); if (!eq) { changed = 1; if (!dry_run && fname && set_rsync_acl(fd, dirfd, leaf, fname, duo_item, SMB_ACL_TYPE_ACCESS, sxp, new_mode) < 0) return -1; } } if (!S_ISDIR(new_mode)) return changed; ndx = F_DIR_DEFACL(file); if (ndx >= 0 && (size_t)ndx < default_acl_list.count) { acl_duo *duo_item = default_acl_list.items; duo_item += ndx; eq = sxp->def_acl && rsync_acl_equal(sxp->def_acl, &duo_item->racl); if (!eq) { changed = 1; if (!dry_run && fname && set_rsync_acl(fd, dirfd, leaf, fname, duo_item, SMB_ACL_TYPE_DEFAULT, sxp, new_mode) < 0) return -1; } } return changed; } int set_acl(const char *fname, const struct file_struct *file, stat_x *sxp, mode_t new_mode) { return set_acl_fdat(-1, -1, NULL, fname, file, sxp, new_mode); } /* Non-incremental recursion needs to convert all the received IDs. * This is done in a single pass after receiving the whole file-list. */ static void match_racl_ids(const item_list *racl_list) { int list_cnt, name_cnt; acl_duo *duo_item = racl_list->items; for (list_cnt = racl_list->count; list_cnt--; duo_item++) { ida_entries *idal = &duo_item->racl.names; id_access *ida = idal->idas; for (name_cnt = idal->count; name_cnt--; ida++) { if (ida->access & NAME_IS_USER) ida->id = match_uid(ida->id); else ida->id = match_gid(ida->id, NULL); } } } void match_acl_ids(void) { match_racl_ids(&access_acl_list); match_racl_ids(&default_acl_list); } /* This is used by dest_mode(). */ int default_perms_for_dir(const char *dir) { rsync_acl racl; SMB_ACL_T sacl; BOOL ok; int perms; if (dir == NULL) dir = "."; perms = ACCESSPERMS & ~orig_umask; /* Read the directory's default ACL. If it has none, this will successfully return an empty ACL. */ sacl = sys_acl_get_file(dir, SMB_ACL_TYPE_DEFAULT); if (sacl == NULL) { /* Couldn't get an ACL. Darn. */ switch (errno) { case EINVAL: /* If SMB_ACL_TYPE_DEFAULT isn't valid, then the ACLs must be non-POSIX. */ break; #ifdef ENOTSUP case ENOTSUP: #endif case ENOSYS: /* No ACLs are available. */ break; default: if (dry_run && errno == ENOENT) { /* We're doing a dry run, so the containing directory * wasn't actually created. Don't worry about it. */ break; } rprintf(FWARNING, "default_perms_for_dir: sys_acl_get_file(%s, %s): %s, falling back on umask\n", dir, str_acl_type(SMB_ACL_TYPE_DEFAULT), strerror(errno)); } return perms; } /* Convert it. */ racl = empty_rsync_acl; ok = unpack_smb_acl(sacl, &racl); sys_acl_free_acl(sacl); if (!ok) { rprintf(FWARNING, "default_perms_for_dir: unpack_smb_acl failed, falling back on umask\n"); return perms; } /* Apply the permission-bit entries of the default ACL, if any. */ if (racl.user_obj != NO_ENTRY) { perms = rsync_acl_get_perms(&racl); if (DEBUG_GTE(ACL, 1)) rprintf(FINFO, "got ACL-based default perms %o for directory %s\n", perms, dir); } rsync_acl_free(&racl); return perms; } #endif /* SUPPORT_ACLS */