/*
* Handle passing Access Control Lists between systems.
*
* Copyright (C) 1996 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2006-2020 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;
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;
}
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);
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
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 (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(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(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(f);
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 && 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(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;
#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(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)-1)
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;
}
/* 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.
*
* 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(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(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(fname, duo_item, SMB_ACL_TYPE_DEFAULT,
sxp, new_mode) < 0)
return -1;
}
}
return changed;
}
/* 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 */
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