freebsd-dev/lib/libc/posix1e/acl_from_text.c

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/*-
* Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
* All rights reserved.
*
* 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.
*/
/*
* acl_from_text: Convert a text-form ACL from a string to an acl_t.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include "namespace.h"
#include <sys/acl.h>
#include "un-namespace.h"
#include <sys/errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "acl_support.h"
static acl_tag_t acl_string_to_tag(char *tag, char *qualifier);
int _nfs4_acl_entry_from_text(acl_t aclp, char *entry);
int _text_could_be_nfs4_acl(const char *entry);
static acl_tag_t
acl_string_to_tag(char *tag, char *qualifier)
{
if (*qualifier == '\0') {
if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
return (ACL_USER_OBJ);
} else
if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
return (ACL_GROUP_OBJ);
} else
if ((!strcmp(tag, "mask")) || (!strcmp(tag, "m"))) {
return (ACL_MASK);
} else
if ((!strcmp(tag, "other")) || (!strcmp(tag, "o"))) {
return (ACL_OTHER);
} else
return(-1);
} else {
if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
return(ACL_USER);
} else
if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
return(ACL_GROUP);
} else
return(-1);
}
}
static int
_posix1e_acl_entry_from_text(acl_t aclp, char *entry)
{
acl_tag_t t;
acl_perm_t p;
char *tag, *qualifier, *permission;
uid_t id;
int error;
assert(_acl_brand(aclp) == ACL_BRAND_POSIX);
/* Split into three ':' delimited fields. */
tag = strsep(&entry, ":");
if (tag == NULL) {
errno = EINVAL;
return (-1);
}
tag = string_skip_whitespace(tag);
if ((*tag == '\0') && (!entry)) {
/*
* Is an entirely comment line, skip to next
* comma.
*/
return (0);
}
string_trim_trailing_whitespace(tag);
qualifier = strsep(&entry, ":");
if (qualifier == NULL) {
errno = EINVAL;
return (-1);
}
qualifier = string_skip_whitespace(qualifier);
string_trim_trailing_whitespace(qualifier);
permission = strsep(&entry, ":");
if (permission == NULL || entry) {
errno = EINVAL;
return (-1);
}
permission = string_skip_whitespace(permission);
string_trim_trailing_whitespace(permission);
t = acl_string_to_tag(tag, qualifier);
if (t == -1) {
errno = EINVAL;
return (-1);
}
error = _posix1e_acl_string_to_perm(permission, &p);
if (error == -1) {
errno = EINVAL;
return (-1);
}
switch(t) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
if (*qualifier != '\0') {
errno = EINVAL;
return (-1);
}
id = 0;
break;
case ACL_USER:
case ACL_GROUP:
error = _acl_name_to_id(t, qualifier, &id);
if (error == -1)
return (-1);
break;
default:
errno = EINVAL;
return (-1);
}
error = _posix1e_acl_add_entry(aclp, t, id, p);
if (error == -1)
return (-1);
return (0);
}
static int
_text_is_nfs4_entry(const char *entry)
{
int count = 0;
assert(strlen(entry) > 0);
while (*entry != '\0') {
if (*entry == ':' || *entry == '@')
count++;
entry++;
}
if (count <= 2)
return (0);
return (1);
}
/*
* acl_from_text -- Convert a string into an ACL.
* Postpone most validity checking until the end and call acl_valid() to do
* that.
*/
acl_t
acl_from_text(const char *buf_p)
{
acl_t acl;
char *mybuf_p, *line, *cur, *notcomment, *comment, *entry;
int error;
/* Local copy we can mess up. */
mybuf_p = strdup(buf_p);
if (mybuf_p == NULL)
return(NULL);
acl = acl_init(3); /* XXX: WTF, 3? */
if (acl == NULL) {
free(mybuf_p);
return(NULL);
}
/* Outer loop: delimit at \n boundaries. */
cur = mybuf_p;
while ((line = strsep(&cur, "\n"))) {
/* Now split the line on the first # to strip out comments. */
comment = line;
notcomment = strsep(&comment, "#");
/* Inner loop: delimit at ',' boundaries. */
while ((entry = strsep(&notcomment, ","))) {
/* Skip empty lines. */
if (strlen(string_skip_whitespace(entry)) == 0)
continue;
if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) {
if (_text_is_nfs4_entry(entry))
_acl_brand_as(acl, ACL_BRAND_NFS4);
else
_acl_brand_as(acl, ACL_BRAND_POSIX);
}
switch (_acl_brand(acl)) {
case ACL_BRAND_NFS4:
error = _nfs4_acl_entry_from_text(acl, entry);
break;
case ACL_BRAND_POSIX:
error = _posix1e_acl_entry_from_text(acl, entry);
break;
default:
error = EINVAL;
break;
}
if (error)
goto error_label;
}
}
#if 0
/* XXX Should we only return ACLs valid according to acl_valid? */
/* Verify validity of the ACL we read in. */
if (acl_valid(acl) == -1) {
errno = EINVAL;
goto error_label;
}
#endif
free(mybuf_p);
return(acl);
error_label:
acl_free(acl);
free(mybuf_p);
return(NULL);
}
/*
* Given a username/groupname from a text form of an ACL, return the uid/gid
* XXX NOT THREAD SAFE, RELIES ON GETPWNAM, GETGRNAM
* XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
* MAY HAVE SIDE-EFFECTS
*/
int
_acl_name_to_id(acl_tag_t tag, char *name, uid_t *id)
{
struct group *g;
struct passwd *p;
unsigned long l;
char *endp;
switch(tag) {
case ACL_USER:
p = getpwnam(name);
if (p == NULL) {
l = strtoul(name, &endp, 0);
if (*endp != '\0' || l != (unsigned long)(uid_t)l) {
errno = EINVAL;
return (-1);
}
*id = (uid_t)l;
return (0);
}
*id = p->pw_uid;
return (0);
case ACL_GROUP:
g = getgrnam(name);
if (g == NULL) {
l = strtoul(name, &endp, 0);
if (*endp != '\0' || l != (unsigned long)(gid_t)l) {
errno = EINVAL;
return (-1);
}
*id = (gid_t)l;
return (0);
}
*id = g->gr_gid;
return (0);
default:
return (EINVAL);
}
}