66c81a3794
Vendor changes (FreeBSD-related): Break ACL read/write code into platform-specific source files Vendor bugfixes (FreeBSD-related): PR 867 (bsdcpio): show numeric uid/gid when names are not found PR 870 (seekable zip): accept files with valid ZIP64 EOCD headers PR 880 (pax): Fix handling of "size" pax header keyword PR 887 (crypto): Discard 3072 bytes instead of 1024 of first keystream OSS-Fuzz issue 806 (mtree): rework mtree_atol10 integer parser Unbreak static dependency on libbz2
338 lines
9.0 KiB
C
338 lines
9.0 KiB
C
/*-
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* Copyright (c) 2017 Martin Matuska
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#if HAVE_MEMBERSHIP_H
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#include <membership.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_ACL_H
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#define _ACL_PRIVATE /* For debugging */
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#include <sys/acl.h>
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#endif
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#include "archive_entry.h"
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#include "archive_private.h"
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#include "archive_read_disk_private.h"
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#include "archive_acl_maps.h"
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/*
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* Darwin-specific ACL functions and helper functions
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*
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* Exported functions:
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* none
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*/
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static int translate_guid(struct archive *a, acl_entry_t acl_entry,
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int *ae_id, int *ae_tag, const char **ae_name)
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{
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void *q;
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uid_t ugid;
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int r, idtype;
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q = acl_get_qualifier(acl_entry);
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if (q == NULL)
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return (1);
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r = mbr_uuid_to_id((const unsigned char *)q, &ugid, &idtype);
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if (r != 0) {
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acl_free(q);
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return (1);
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}
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if (idtype == ID_TYPE_UID) {
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*ae_tag = ARCHIVE_ENTRY_ACL_USER;
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*ae_id = ugid;
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*ae_name = archive_read_disk_uname(a, *ae_id);
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} else if (idtype == ID_TYPE_GID) {
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*ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
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*ae_id = ugid;
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*ae_name = archive_read_disk_gname(a, *ae_id);
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} else
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r = 1;
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acl_free(q);
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return (r);
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}
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/*
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* Add trivial NFSv4 ACL entries from mode
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*/
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static void
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add_trivial_nfs4_acl(struct archive_entry *entry)
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{
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mode_t mode;
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int i;
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const int rperm = ARCHIVE_ENTRY_ACL_READ_DATA;
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const int wperm = ARCHIVE_ENTRY_ACL_WRITE_DATA |
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ARCHIVE_ENTRY_ACL_APPEND_DATA;
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const int eperm = ARCHIVE_ENTRY_ACL_EXECUTE;
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const int pubset = ARCHIVE_ENTRY_ACL_READ_ATTRIBUTES |
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ARCHIVE_ENTRY_ACL_READ_NAMED_ATTRS |
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ARCHIVE_ENTRY_ACL_READ_ACL |
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ARCHIVE_ENTRY_ACL_SYNCHRONIZE;
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const int ownset = pubset | ARCHIVE_ENTRY_ACL_WRITE_ATTRIBUTES |
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ARCHIVE_ENTRY_ACL_WRITE_NAMED_ATTRS |
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ARCHIVE_ENTRY_ACL_WRITE_ACL |
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ARCHIVE_ENTRY_ACL_WRITE_OWNER;
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struct {
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const int type;
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const int tag;
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int permset;
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} tacl_entry[] = {
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{ARCHIVE_ENTRY_ACL_TYPE_ALLOW, ARCHIVE_ENTRY_ACL_USER_OBJ, 0},
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{ARCHIVE_ENTRY_ACL_TYPE_DENY, ARCHIVE_ENTRY_ACL_USER_OBJ, 0},
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{ARCHIVE_ENTRY_ACL_TYPE_DENY, ARCHIVE_ENTRY_ACL_GROUP_OBJ, 0},
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{ARCHIVE_ENTRY_ACL_TYPE_ALLOW, ARCHIVE_ENTRY_ACL_USER_OBJ, ownset},
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{ARCHIVE_ENTRY_ACL_TYPE_ALLOW, ARCHIVE_ENTRY_ACL_GROUP_OBJ, pubset},
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{ARCHIVE_ENTRY_ACL_TYPE_ALLOW, ARCHIVE_ENTRY_ACL_EVERYONE, pubset}
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};
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mode = archive_entry_mode(entry);
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/* Permissions for everyone@ */
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if (mode & 0004)
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tacl_entry[5].permset |= rperm;
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if (mode & 0002)
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tacl_entry[5].permset |= wperm;
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if (mode & 0001)
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tacl_entry[5].permset |= eperm;
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/* Permissions for group@ */
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if (mode & 0040)
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tacl_entry[4].permset |= rperm;
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else if (mode & 0004)
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tacl_entry[2].permset |= rperm;
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if (mode & 0020)
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tacl_entry[4].permset |= wperm;
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else if (mode & 0002)
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tacl_entry[2].permset |= wperm;
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if (mode & 0010)
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tacl_entry[4].permset |= eperm;
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else if (mode & 0001)
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tacl_entry[2].permset |= eperm;
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/* Permissions for owner@ */
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if (mode & 0400) {
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tacl_entry[3].permset |= rperm;
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if (!(mode & 0040) && (mode & 0004))
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tacl_entry[0].permset |= rperm;
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} else if ((mode & 0040) || (mode & 0004))
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tacl_entry[1].permset |= rperm;
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if (mode & 0200) {
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tacl_entry[3].permset |= wperm;
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if (!(mode & 0020) && (mode & 0002))
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tacl_entry[0].permset |= wperm;
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} else if ((mode & 0020) || (mode & 0002))
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tacl_entry[1].permset |= wperm;
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if (mode & 0100) {
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tacl_entry[3].permset |= eperm;
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if (!(mode & 0010) && (mode & 0001))
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tacl_entry[0].permset |= eperm;
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} else if ((mode & 0010) || (mode & 0001))
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tacl_entry[1].permset |= eperm;
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for (i = 0; i < 6; i++) {
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if (tacl_entry[i].permset != 0) {
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archive_entry_acl_add_entry(entry,
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tacl_entry[i].type, tacl_entry[i].permset,
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tacl_entry[i].tag, -1, NULL);
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}
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}
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return;
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}
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static int
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translate_acl(struct archive_read_disk *a,
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struct archive_entry *entry, acl_t acl)
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{
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acl_tag_t acl_tag;
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acl_flagset_t acl_flagset;
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acl_entry_t acl_entry;
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acl_permset_t acl_permset;
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int i, entry_acl_type;
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int r, s, ae_id, ae_tag, ae_perm;
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const char *ae_name;
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s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
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if (s == -1) {
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archive_set_error(&a->archive, errno,
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"Failed to get first ACL entry");
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return (ARCHIVE_WARN);
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}
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while (s == 0) {
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ae_id = -1;
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ae_name = NULL;
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ae_perm = 0;
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if (acl_get_tag_type(acl_entry, &acl_tag) != 0) {
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archive_set_error(&a->archive, errno,
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"Failed to get ACL tag type");
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return (ARCHIVE_WARN);
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}
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switch (acl_tag) {
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case ACL_EXTENDED_ALLOW:
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entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_ALLOW;
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r = translate_guid(&a->archive, acl_entry,
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&ae_id, &ae_tag, &ae_name);
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break;
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case ACL_EXTENDED_DENY:
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entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_DENY;
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r = translate_guid(&a->archive, acl_entry,
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&ae_id, &ae_tag, &ae_name);
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break;
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default:
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/* Skip types that libarchive can't support. */
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s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
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continue;
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}
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/* Skip if translate_guid() above failed */
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if (r != 0) {
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s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
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continue;
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}
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/*
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* Libarchive stores "flag" (NFSv4 inheritance bits)
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* in the ae_perm bitmap.
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*
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* acl_get_flagset_np() fails with non-NFSv4 ACLs
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*/
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if (acl_get_flagset_np(acl_entry, &acl_flagset) != 0) {
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archive_set_error(&a->archive, errno,
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"Failed to get flagset from a NFSv4 ACL entry");
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return (ARCHIVE_WARN);
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}
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for (i = 0; i < acl_nfs4_flag_map_size; ++i) {
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r = acl_get_flag_np(acl_flagset,
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acl_nfs4_flag_map[i].p_perm);
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if (r == -1) {
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archive_set_error(&a->archive, errno,
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"Failed to check flag in a NFSv4 "
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"ACL flagset");
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return (ARCHIVE_WARN);
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} else if (r)
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ae_perm |= acl_nfs4_flag_map[i].a_perm;
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}
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if (acl_get_permset(acl_entry, &acl_permset) != 0) {
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archive_set_error(&a->archive, errno,
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"Failed to get ACL permission set");
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return (ARCHIVE_WARN);
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}
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for (i = 0; i < acl_nfs4_perm_map_size; ++i) {
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/*
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* acl_get_perm() is spelled differently on different
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* platforms; see above.
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*/
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r = acl_get_perm_np(acl_permset,
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acl_nfs4_perm_map[i].p_perm);
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if (r == -1) {
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archive_set_error(&a->archive, errno,
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"Failed to check permission in an ACL "
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"permission set");
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return (ARCHIVE_WARN);
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} else if (r)
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ae_perm |= acl_nfs4_perm_map[i].a_perm;
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}
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#if !HAVE_DECL_ACL_SYNCHRONIZE
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/* On Mac OS X without ACL_SYNCHRONIZE assume it is set */
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ae_perm |= ARCHIVE_ENTRY_ACL_SYNCHRONIZE;
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#endif
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archive_entry_acl_add_entry(entry, entry_acl_type,
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ae_perm, ae_tag,
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ae_id, ae_name);
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s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
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}
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return (ARCHIVE_OK);
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}
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int
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archive_read_disk_entry_setup_acls(struct archive_read_disk *a,
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struct archive_entry *entry, int *fd)
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{
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const char *accpath;
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acl_t acl;
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int r;
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accpath = NULL;
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if (*fd < 0) {
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accpath = archive_read_disk_entry_setup_path(a, entry, fd);
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if (accpath == NULL)
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return (ARCHIVE_WARN);
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}
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archive_entry_acl_clear(entry);
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acl = NULL;
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if (*fd >= 0)
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acl = acl_get_fd_np(*fd, ACL_TYPE_EXTENDED);
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else if (!a->follow_symlinks)
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acl = acl_get_link_np(accpath, ACL_TYPE_EXTENDED);
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else
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acl = acl_get_file(accpath, ACL_TYPE_EXTENDED);
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if (acl != NULL) {
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r = translate_acl(a, entry, acl);
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acl_free(acl);
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acl = NULL;
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if (r != ARCHIVE_OK) {
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archive_set_error(&a->archive, errno,
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"Couldn't translate NFSv4 ACLs");
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}
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/*
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* Because Mac OS doesn't support owner@, group@ and everyone@
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* ACLs we need to add NFSv4 ACLs mirroring the file mode to
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* the archive entry. Otherwise extraction on non-Mac platforms
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* would lead to an invalid file mode.
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*/
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if ((archive_entry_acl_types(entry) &
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ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0)
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add_trivial_nfs4_acl(entry);
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return (r);
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}
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return (ARCHIVE_OK);
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}
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