2793a18599
They only make sense in the context of directory ACLs, and attempting to set them on regular files results in errors, causing a recursive setfacl invocation to abort. This is derived from patches by Shawn Webb <shawn.webb@hardenedbsd.org> and Mitchell Horne <mhorne063@gmail.com>. PR: 155163 MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D15061
506 lines
13 KiB
C
506 lines
13 KiB
C
/*-
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* Copyright (c) 2001 Chris D. Faulhaber
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/acl.h>
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#include <sys/queue.h>
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#include <err.h>
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#include <errno.h>
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#include <fts.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "setfacl.h"
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/* file operations */
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#define OP_MERGE_ACL 0x00 /* merge acl's (-mM) */
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#define OP_REMOVE_DEF 0x01 /* remove default acl's (-k) */
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#define OP_REMOVE_EXT 0x02 /* remove extended acl's (-b) */
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#define OP_REMOVE_ACL 0x03 /* remove acl's (-xX) */
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#define OP_REMOVE_BY_NUMBER 0x04 /* remove acl's (-xX) by acl entry number */
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#define OP_ADD_ACL 0x05 /* add acls entries at a given position */
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/* TAILQ entry for acl operations */
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struct sf_entry {
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uint op;
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acl_t acl;
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uint entry_number;
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TAILQ_ENTRY(sf_entry) next;
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};
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static TAILQ_HEAD(, sf_entry) entrylist;
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bool have_mask;
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bool have_stdin;
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bool n_flag;
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static bool h_flag;
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static bool H_flag;
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static bool L_flag;
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static bool R_flag;
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static bool need_mask;
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static acl_type_t acl_type = ACL_TYPE_ACCESS;
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static int handle_file(FTS *ftsp, FTSENT *file);
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static acl_t clear_inheritance_flags(acl_t acl);
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static char **stdin_files(void);
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static void usage(void);
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static void
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usage(void)
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{
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fprintf(stderr, "usage: setfacl [-R [-H | -L | -P]] [-bdhkn] "
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"[-a position entries] [-m entries] [-M file] "
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"[-x entries] [-X file] [file ...]\n");
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exit(1);
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}
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static char **
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stdin_files(void)
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{
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char **files_list;
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char filename[PATH_MAX];
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size_t fl_count, i;
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if (have_stdin)
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err(1, "cannot have more than one stdin");
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i = 0;
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have_stdin = true;
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bzero(&filename, sizeof(filename));
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/* Start with an array size sufficient for basic cases. */
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fl_count = 1024;
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files_list = zmalloc(fl_count * sizeof(char *));
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while (fgets(filename, (int)sizeof(filename), stdin)) {
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/* remove the \n */
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filename[strlen(filename) - 1] = '\0';
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files_list[i] = strdup(filename);
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if (files_list[i] == NULL)
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err(1, "strdup() failed");
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/* Grow array if necessary. */
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if (++i == fl_count) {
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fl_count <<= 1;
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if (fl_count > SIZE_MAX / sizeof(char *))
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errx(1, "Too many input files");
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files_list = zrealloc(files_list,
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fl_count * sizeof(char *));
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}
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}
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/* fts_open() requires the last array element to be NULL. */
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files_list[i] = NULL;
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return (files_list);
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}
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/*
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* Remove any inheritance flags from NFSv4 ACLs when running in recursive
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* mode. This is to avoid files being assigned identical ACLs to their
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* parent directory while also being set to inherit them.
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*
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* The acl argument is assumed to be valid.
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*/
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static acl_t
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clear_inheritance_flags(acl_t acl)
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{
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acl_t nacl;
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acl_entry_t acl_entry;
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acl_flagset_t acl_flagset;
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int acl_brand, entry_id;
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(void)acl_get_brand_np(acl, &acl_brand);
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if (acl_brand != ACL_BRAND_NFS4)
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return (acl);
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nacl = acl_dup(acl);
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if (nacl == NULL) {
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warn("acl_dup() failed");
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return (acl);
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}
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entry_id = ACL_FIRST_ENTRY;
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while (acl_get_entry(nacl, entry_id, &acl_entry) == 1) {
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entry_id = ACL_NEXT_ENTRY;
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if (acl_get_flagset_np(acl_entry, &acl_flagset) != 0) {
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warn("acl_get_flagset_np() failed");
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continue;
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}
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if (acl_get_flag_np(acl_flagset, ACL_ENTRY_INHERIT_ONLY) == 1) {
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if (acl_delete_entry(nacl, acl_entry) != 0)
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warn("acl_delete_entry() failed");
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continue;
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}
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if (acl_delete_flag_np(acl_flagset,
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ACL_ENTRY_FILE_INHERIT |
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ACL_ENTRY_DIRECTORY_INHERIT |
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ACL_ENTRY_NO_PROPAGATE_INHERIT) != 0)
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warn("acl_delete_flag_np() failed");
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}
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return (nacl);
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}
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static int
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handle_file(FTS *ftsp, FTSENT *file)
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{
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acl_t acl, nacl;
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acl_entry_t unused_entry;
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int local_error, ret;
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struct sf_entry *entry;
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bool follow_symlink;
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local_error = 0;
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switch (file->fts_info) {
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case FTS_D:
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/* Do not recurse if -R not specified. */
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if (!R_flag)
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fts_set(ftsp, file, FTS_SKIP);
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break;
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case FTS_DP:
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/* Skip the second visit to a directory. */
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return (0);
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case FTS_DNR:
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case FTS_ERR:
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warnx("%s: %s", file->fts_path, strerror(file->fts_errno));
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return (0);
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default:
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break;
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}
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if (acl_type == ACL_TYPE_DEFAULT && file->fts_info != FTS_D) {
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warnx("%s: default ACL may only be set on a directory",
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file->fts_path);
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return (1);
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}
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follow_symlink = (!R_flag && !h_flag) || (R_flag && L_flag) ||
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(R_flag && H_flag && file->fts_level == FTS_ROOTLEVEL);
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if (follow_symlink)
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ret = pathconf(file->fts_accpath, _PC_ACL_NFS4);
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else
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ret = lpathconf(file->fts_accpath, _PC_ACL_NFS4);
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if (ret > 0) {
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if (acl_type == ACL_TYPE_DEFAULT) {
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warnx("%s: there are no default entries in NFSv4 ACLs",
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file->fts_path);
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return (1);
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}
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acl_type = ACL_TYPE_NFS4;
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} else if (ret == 0) {
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if (acl_type == ACL_TYPE_NFS4)
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acl_type = ACL_TYPE_ACCESS;
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} else if (ret < 0 && errno != EINVAL && errno != ENOENT) {
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warn("%s: pathconf(_PC_ACL_NFS4) failed",
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file->fts_path);
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}
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if (follow_symlink)
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acl = acl_get_file(file->fts_accpath, acl_type);
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else
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acl = acl_get_link_np(file->fts_accpath, acl_type);
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if (acl == NULL) {
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if (follow_symlink)
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warn("%s: acl_get_file() failed", file->fts_path);
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else
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warn("%s: acl_get_link_np() failed", file->fts_path);
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return (1);
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}
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/* Cycle through each option. */
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TAILQ_FOREACH(entry, &entrylist, next) {
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nacl = entry->acl;
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switch (entry->op) {
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case OP_ADD_ACL:
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if (R_flag && file->fts_info != FTS_D &&
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acl_type == ACL_TYPE_NFS4)
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nacl = clear_inheritance_flags(nacl);
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local_error += add_acl(nacl, entry->entry_number, &acl,
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file->fts_path);
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break;
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case OP_MERGE_ACL:
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if (R_flag && file->fts_info != FTS_D &&
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acl_type == ACL_TYPE_NFS4)
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nacl = clear_inheritance_flags(nacl);
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local_error += merge_acl(nacl, &acl, file->fts_path);
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need_mask = true;
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break;
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case OP_REMOVE_EXT:
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/*
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* Don't try to call remove_ext() for empty
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* default ACL.
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*/
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if (acl_type == ACL_TYPE_DEFAULT &&
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acl_get_entry(acl, ACL_FIRST_ENTRY,
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&unused_entry) == 0) {
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local_error += remove_default(&acl,
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file->fts_path);
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break;
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}
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remove_ext(&acl, file->fts_path);
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need_mask = false;
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break;
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case OP_REMOVE_DEF:
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if (acl_type == ACL_TYPE_NFS4) {
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warnx("%s: there are no default entries in "
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"NFSv4 ACLs; cannot remove",
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file->fts_path);
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local_error++;
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break;
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}
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if (acl_delete_def_file(file->fts_accpath) == -1) {
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warn("%s: acl_delete_def_file() failed",
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file->fts_path);
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local_error++;
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}
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if (acl_type == ACL_TYPE_DEFAULT)
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local_error += remove_default(&acl,
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file->fts_path);
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need_mask = false;
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break;
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case OP_REMOVE_ACL:
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local_error += remove_acl(nacl, &acl, file->fts_path);
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need_mask = true;
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break;
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case OP_REMOVE_BY_NUMBER:
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local_error += remove_by_number(entry->entry_number,
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&acl, file->fts_path);
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need_mask = true;
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break;
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}
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if (nacl != entry->acl) {
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acl_free(nacl);
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nacl = NULL;
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}
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if (local_error)
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break;
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}
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ret = 0;
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/*
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* Don't try to set an empty default ACL; it will always fail.
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* Use acl_delete_def_file(3) instead.
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*/
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if (acl_type == ACL_TYPE_DEFAULT &&
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acl_get_entry(acl, ACL_FIRST_ENTRY, &unused_entry) == 0) {
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if (acl_delete_def_file(file->fts_accpath) == -1) {
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warn("%s: acl_delete_def_file() failed",
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file->fts_path);
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ret = 1;
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}
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goto out;
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}
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/* Don't bother setting the ACL if something is broken. */
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if (local_error) {
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ret = 1;
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} else if (acl_type != ACL_TYPE_NFS4 && need_mask &&
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set_acl_mask(&acl, file->fts_path) == -1) {
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warnx("%s: failed to set ACL mask", file->fts_path);
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ret = 1;
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} else if (follow_symlink) {
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if (acl_set_file(file->fts_accpath, acl_type, acl) == -1) {
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warn("%s: acl_set_file() failed", file->fts_path);
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ret = 1;
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}
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} else {
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if (acl_set_link_np(file->fts_accpath, acl_type, acl) == -1) {
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warn("%s: acl_set_link_np() failed", file->fts_path);
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ret = 1;
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}
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}
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out:
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acl_free(acl);
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return (ret);
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}
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int
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main(int argc, char *argv[])
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{
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int carried_error, ch, entry_number, fts_options;
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FTS *ftsp;
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FTSENT *file;
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char **files_list;
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struct sf_entry *entry;
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char *end;
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acl_type = ACL_TYPE_ACCESS;
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carried_error = fts_options = 0;
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have_mask = have_stdin = n_flag = false;
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TAILQ_INIT(&entrylist);
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while ((ch = getopt(argc, argv, "HLM:PRX:a:bdhkm:nx:")) != -1)
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switch(ch) {
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case 'H':
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H_flag = true;
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L_flag = false;
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break;
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case 'L':
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L_flag = true;
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H_flag = false;
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break;
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case 'M':
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entry = zmalloc(sizeof(struct sf_entry));
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entry->acl = get_acl_from_file(optarg);
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if (entry->acl == NULL)
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err(1, "%s: get_acl_from_file() failed",
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optarg);
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entry->op = OP_MERGE_ACL;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'P':
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H_flag = L_flag = false;
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break;
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case 'R':
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R_flag = true;
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break;
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case 'X':
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entry = zmalloc(sizeof(struct sf_entry));
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entry->acl = get_acl_from_file(optarg);
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entry->op = OP_REMOVE_ACL;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'a':
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entry = zmalloc(sizeof(struct sf_entry));
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entry_number = strtol(optarg, &end, 10);
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if (end - optarg != (int)strlen(optarg))
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errx(1, "%s: invalid entry number", optarg);
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if (entry_number < 0)
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errx(1,
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"%s: entry number cannot be less than zero",
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optarg);
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entry->entry_number = entry_number;
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if (argv[optind] == NULL)
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errx(1, "missing ACL");
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entry->acl = acl_from_text(argv[optind]);
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if (entry->acl == NULL)
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err(1, "%s", argv[optind]);
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optind++;
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entry->op = OP_ADD_ACL;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'b':
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entry = zmalloc(sizeof(struct sf_entry));
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entry->op = OP_REMOVE_EXT;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'd':
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acl_type = ACL_TYPE_DEFAULT;
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break;
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case 'h':
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h_flag = 1;
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break;
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case 'k':
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entry = zmalloc(sizeof(struct sf_entry));
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entry->op = OP_REMOVE_DEF;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'm':
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entry = zmalloc(sizeof(struct sf_entry));
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entry->acl = acl_from_text(optarg);
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if (entry->acl == NULL)
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err(1, "%s", optarg);
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entry->op = OP_MERGE_ACL;
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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case 'n':
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n_flag = true;
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break;
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case 'x':
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entry = zmalloc(sizeof(struct sf_entry));
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entry_number = strtol(optarg, &end, 10);
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if (end - optarg == (int)strlen(optarg)) {
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if (entry_number < 0)
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errx(1,
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"%s: entry number cannot be less than zero",
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optarg);
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entry->entry_number = entry_number;
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entry->op = OP_REMOVE_BY_NUMBER;
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} else {
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entry->acl = acl_from_text(optarg);
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if (entry->acl == NULL)
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err(1, "%s", optarg);
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entry->op = OP_REMOVE_ACL;
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}
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TAILQ_INSERT_TAIL(&entrylist, entry, next);
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break;
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default:
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usage();
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break;
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}
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argc -= optind;
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argv += optind;
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if (!n_flag && TAILQ_EMPTY(&entrylist))
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usage();
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/* Take list of files from stdin. */
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if (argc == 0 || strcmp(argv[0], "-") == 0) {
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files_list = stdin_files();
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} else
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files_list = argv;
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if (R_flag) {
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if (h_flag)
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errx(1, "the -R and -h options may not be "
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"specified together.");
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if (L_flag) {
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fts_options = FTS_LOGICAL;
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} else {
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fts_options = FTS_PHYSICAL;
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if (H_flag) {
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fts_options |= FTS_COMFOLLOW;
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}
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}
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} else if (h_flag) {
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fts_options = FTS_PHYSICAL;
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} else {
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fts_options = FTS_LOGICAL;
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}
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/* Open all files. */
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if ((ftsp = fts_open(files_list, fts_options | FTS_NOSTAT, 0)) == NULL)
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err(1, "fts_open");
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while ((file = fts_read(ftsp)) != NULL)
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carried_error += handle_file(ftsp, file);
|
|
|
|
return (carried_error);
|
|
}
|