freebsd-dev/lib/libc/posix1e/acl_to_text_nfs4.c
Warner Losh 4d846d260e spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:		pfg
MFC After:		3 days
Sponsored by:		Netflix
2023-05-12 10:44:03 -06:00

266 lines
5.9 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/acl.h>
#include "acl_support.h"
#define MAX_ENTRY_LENGTH 512
static int
format_who(char *str, size_t size, const acl_entry_t entry, int numeric)
{
int error;
acl_tag_t tag;
struct passwd *pwd;
struct group *grp;
uid_t *id;
error = acl_get_tag_type(entry, &tag);
if (error)
return (error);
switch (tag) {
case ACL_USER_OBJ:
snprintf(str, size, "owner@");
break;
case ACL_USER:
id = (uid_t *)acl_get_qualifier(entry);
if (id == NULL)
return (-1);
/* XXX: Thread-unsafe. */
if (!numeric)
pwd = getpwuid(*id);
else
pwd = NULL;
if (pwd == NULL)
snprintf(str, size, "user:%d", (unsigned int)*id);
else
snprintf(str, size, "user:%s", pwd->pw_name);
break;
case ACL_GROUP_OBJ:
snprintf(str, size, "group@");
break;
case ACL_GROUP:
id = (uid_t *)acl_get_qualifier(entry);
if (id == NULL)
return (-1);
/* XXX: Thread-unsafe. */
if (!numeric)
grp = getgrgid(*id);
else
grp = NULL;
if (grp == NULL)
snprintf(str, size, "group:%d", (unsigned int)*id);
else
snprintf(str, size, "group:%s", grp->gr_name);
break;
case ACL_EVERYONE:
snprintf(str, size, "everyone@");
break;
default:
return (-1);
}
return (0);
}
static int
format_entry_type(char *str, size_t size, const acl_entry_t entry)
{
int error;
acl_entry_type_t entry_type;
error = acl_get_entry_type_np(entry, &entry_type);
if (error)
return (error);
switch (entry_type) {
case ACL_ENTRY_TYPE_ALLOW:
snprintf(str, size, "allow");
break;
case ACL_ENTRY_TYPE_DENY:
snprintf(str, size, "deny");
break;
case ACL_ENTRY_TYPE_AUDIT:
snprintf(str, size, "audit");
break;
case ACL_ENTRY_TYPE_ALARM:
snprintf(str, size, "alarm");
break;
default:
return (-1);
}
return (0);
}
static int
format_additional_id(char *str, size_t size, const acl_entry_t entry)
{
int error;
acl_tag_t tag;
uid_t *id;
error = acl_get_tag_type(entry, &tag);
if (error)
return (error);
switch (tag) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_EVERYONE:
str[0] = '\0';
break;
default:
id = (uid_t *)acl_get_qualifier(entry);
if (id == NULL)
return (-1);
snprintf(str, size, ":%d", (unsigned int)*id);
}
return (0);
}
static int
format_entry(char *str, size_t size, const acl_entry_t entry, int flags)
{
size_t off = 0, min_who_field_length = 18;
acl_permset_t permset;
acl_flagset_t flagset;
int error, len;
char buf[MAX_ENTRY_LENGTH + 1];
assert(_entry_brand(entry) == ACL_BRAND_NFS4);
error = acl_get_flagset_np(entry, &flagset);
if (error)
return (error);
error = acl_get_permset(entry, &permset);
if (error)
return (error);
error = format_who(buf, sizeof(buf), entry,
flags & ACL_TEXT_NUMERIC_IDS);
if (error)
return (error);
len = strlen(buf);
if (len < min_who_field_length)
len = min_who_field_length;
off += snprintf(str + off, size - off, "%*s:", len, buf);
error = _nfs4_format_access_mask(buf, sizeof(buf), *permset,
flags & ACL_TEXT_VERBOSE);
if (error)
return (error);
off += snprintf(str + off, size - off, "%s:", buf);
error = _nfs4_format_flags(buf, sizeof(buf), *flagset,
flags & ACL_TEXT_VERBOSE);
if (error)
return (error);
off += snprintf(str + off, size - off, "%s:", buf);
error = format_entry_type(buf, sizeof(buf), entry);
if (error)
return (error);
off += snprintf(str + off, size - off, "%s", buf);
if (flags & ACL_TEXT_APPEND_ID) {
error = format_additional_id(buf, sizeof(buf), entry);
if (error)
return (error);
off += snprintf(str + off, size - off, "%s", buf);
}
off += snprintf(str + off, size - off, "\n");
/* Make sure we didn't truncate anything. */
assert (off < size);
return (0);
}
char *
_nfs4_acl_to_text_np(const acl_t aclp, ssize_t *len_p, int flags)
{
int error, off = 0, size, entry_id = ACL_FIRST_ENTRY;
char *str;
acl_entry_t entry;
if (aclp->ats_acl.acl_cnt == 0)
return strdup("");
size = aclp->ats_acl.acl_cnt * MAX_ENTRY_LENGTH;
str = malloc(size);
if (str == NULL)
return (NULL);
while (acl_get_entry(aclp, entry_id, &entry) == 1) {
entry_id = ACL_NEXT_ENTRY;
assert(off < size);
error = format_entry(str + off, size - off, entry, flags);
if (error) {
free(str);
errno = EINVAL;
return (NULL);
}
off = strlen(str);
}
assert(off < size);
str[off] = '\0';
if (len_p != NULL)
*len_p = off;
return (str);
}