diff options
Diffstat (limited to 'acls.c')
| -rw-r--r-- | acls.c | 1140 |
1 files changed, 1140 insertions, 0 deletions
@@ -0,0 +1,1140 @@ +/* + * 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" + +#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) { + 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. */ +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; + (void)mode; +#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 */ |