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- /*
- * Handle passing Access Control Lists between systems.
- *
- * Copyright (C) 1996 Andrew Tridgell
- * Copyright (C) 1996 Paul Mackerras
- * Copyright (C) 2006-2008 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"
- #ifdef SUPPORT_ACLS
- extern int dry_run;
- extern int am_root;
- extern int read_only;
- extern int list_only;
- extern int orig_umask;
- extern int numeric_ids;
- extern int inc_recurse;
- /* 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 hightest 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;
- /* === 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
- + 4;
- #else
- + (racl->mask_obj != NO_ENTRY) + 3;
- #endif
- }
- /* 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(rsync_acl *racl)
- {
- racl->user_obj = NO_ENTRY;
- if (racl->mask_obj == NO_ENTRY)
- racl->group_obj = NO_ENTRY;
- else {
- if (racl->group_obj == racl->mask_obj)
- racl->group_obj = NO_ENTRY;
- racl->mask_obj = NO_ENTRY;
- }
- 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);
- if (!racl)
- out_of_memory("create_racl");
- *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
- if (!(racl->names.idas = new_array(id_access, temp_ida_list.count)))
- out_of_memory("unpack_smb_acl");
- 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;
- #ifdef ACLS_NEED_MASK
- if (!racl->names.count && racl->mask_obj != NO_ENTRY) {
- /* Throw away a superfluous mask, but mask off the
- * group perms with it first. */
- racl->group_obj &= racl->mask_obj;
- racl->mask_obj = NO_ENTRY;
- }
- #endif
- 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, NULL) );
- #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;
- }
- static int get_rsync_acl(const char *fname, rsync_acl *racl,
- SMB_ACL_TYPE_T type, mode_t mode)
- {
- SMB_ACL_T sacl;
- #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, 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);
- racl->group_obj = IVAL(buf, 4);
- racl->mask_obj = IVAL(buf, 8);
- racl->other_obj = IVAL(buf, 12);
- if (cnt) {
- char *bp = buf + 4*4;
- id_access *ida;
- if (!(ida = racl->names.idas = new_array(id_access, cnt)))
- out_of_memory("get_rsync_acl");
- 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
- if ((sacl = sys_acl_get_file(fname, type)) != 0) {
- BOOL ok = unpack_smb_acl(sacl, racl);
- sys_acl_free_acl(sacl);
- if (!ok) {
- 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. */
- int get_acl(const char *fname, stat_x *sxp)
- {
- sxp->acc_acl = create_racl();
- if (get_rsync_acl(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(fname, sxp->def_acl, SMB_ACL_TYPE_DEFAULT,
- sxp->st.st_mode) < 0) {
- free_acl(sxp);
- return -1;
- }
- }
- return 0;
- }
- /* === Send functions === */
- /* Send the ida list over the file descriptor. */
- static void send_ida_entries(const ida_entries *idal, int f)
- {
- 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 = add_uid(ida->id);
- } else
- name = 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(rsync_acl *racl, SMB_ACL_TYPE_T type,
- item_list *racl_list, int f)
- {
- 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(&racl->names, f);
- /* 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(stat_x *sxp, int f)
- {
- 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->acc_acl);
- send_rsync_acl(sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list, f);
- if (S_ISDIR(sxp->st.st_mode)) {
- if (!sxp->def_acl)
- sxp->def_acl = create_racl();
- send_rsync_acl(sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list, f);
- }
- }
- /* === Receive functions === */
- static uint32 recv_acl_access(uchar *name_follows_ptr, int f)
- {
- 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(ida_entries *ent, int f)
- {
- uchar computed_mask_bits = 0;
- int i, count = read_varint(f);
- if (count) {
- if (!(ent->idas = new_array(id_access, count)))
- out_of_memory("recv_ida_entries");
- } else
- ent->idas = NULL;
- ent->count = count;
- for (i = 0; i < count; i++) {
- uchar has_name;
- id_t id = read_varint(f);
- uint32 access = recv_acl_access(&has_name, f);
- 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 && am_root && !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(item_list *racl_list, SMB_ACL_TYPE_T type, int f)
- {
- 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(NULL, f);
- if (flags & XMIT_GROUP_OBJ)
- duo_item->racl.group_obj = recv_acl_access(NULL, f);
- if (flags & XMIT_MASK_OBJ)
- duo_item->racl.mask_obj = recv_acl_access(NULL, f);
- if (flags & XMIT_OTHER_OBJ)
- duo_item->racl.other_obj = recv_acl_access(NULL, f);
- if (flags & XMIT_NAME_LIST)
- computed_mask_bits |= recv_ida_entries(&duo_item->racl.names, f);
- #ifdef HAVE_OSX_ACLS
- /* If we received a superfluous mask, throw it away. */
- duo_item->racl.mask_obj = NO_ENTRY;
- #else
- if (!duo_item->racl.names.count) {
- /* If we received a superfluous mask, throw it away. */
- if (duo_item->racl.mask_obj != NO_ENTRY) {
- /* Mask off the group perms with it first. */
- duo_item->racl.group_obj &= duo_item->racl.mask_obj | NO_ENTRY;
- duo_item->racl.mask_obj = NO_ENTRY;
- }
- } else if (duo_item->racl.mask_obj == NO_ENTRY) /* Must be non-empty with lists. */
- duo_item->racl.mask_obj = (computed_mask_bits | duo_item->racl.group_obj) & ~NO_ENTRY;
- #endif
- duo_item->sacl = NULL;
- return ndx;
- }
- /* Receive the ACL info the sender has included for this file-list entry. */
- void receive_acl(struct file_struct *file, int f)
- {
- F_ACL(file) = recv_rsync_acl(&access_acl_list, SMB_ACL_TYPE_ACCESS, f);
- if (S_ISDIR(file->mode))
- F_DIR_DEFACL(file) = recv_rsync_acl(&default_acl_list, SMB_ACL_TYPE_DEFAULT, f);
- }
- 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_acl(struct file_struct *file, stat_x *sxp)
- {
- F_ACL(file) = cache_rsync_acl(sxp->acc_acl,
- SMB_ACL_TYPE_ACCESS, &access_acl_list);
- if (S_ISDIR(sxp->st.st_mode)) {
- F_DIR_DEFACL(file) = cache_rsync_acl(sxp->def_acl,
- SMB_ACL_TYPE_DEFAULT, &default_acl_list);
- }
- }
- #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 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) );
- 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)~0;
- }
- #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(const char *fname, acl_duo *duo_item,
- SMB_ACL_TYPE_T type, stat_x *sxp, mode_t mode)
- {
- 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(fname);
- 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(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
- mode = 0; /* 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)~0)
- return 0;
- }
- #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;
- }
- /* Set ACL on indicated filename.
- *
- * This sets extended access ACL entries and default ACL. If convenient,
- * it sets permission bits along with the access ACL and signals having
- * done so by modifying sxp->st.st_mode.
- *
- * Returns 1 for unchanged, 0 for changed, -1 for failed. Call this
- * with fname set to NULL to just check if the ACL is unchanged. */
- int set_acl(const char *fname, const struct file_struct *file, stat_x *sxp)
- {
- int unchanged = 1;
- 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, file->mode);
- if (!eq) {
- unchanged = 0;
- if (!dry_run && fname
- && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_ACCESS,
- sxp, file->mode) < 0)
- unchanged = -1;
- }
- }
- if (!S_ISDIR(sxp->st.st_mode))
- return unchanged;
- 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) {
- if (unchanged > 0)
- unchanged = 0;
- if (!dry_run && fname
- && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_DEFAULT,
- sxp, file->mode) < 0)
- unchanged = -1;
- }
- }
- return unchanged;
- }
- /* 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) {
- #ifdef ENOTSUP
- case ENOTSUP:
- #endif
- case ENOSYS:
- /* No ACLs are available. */
- break;
- case ENOENT:
- if (dry_run) {
- /* We're doing a dry run, so the containing directory
- * wasn't actually created. Don't worry about it. */
- break;
- }
- /* Otherwise fall through. */
- default:
- 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 (verbose > 2)
- rprintf(FINFO, "got ACL-based default perms %o for directory %s\n", perms, dir);
- }
- rsync_acl_free(&racl);
- return perms;
- }
- #endif /* SUPPORT_ACLS */
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