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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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "acl_support.h"
static acl_tag_t acl_string_to_tag(char *tag, char *qualifier);
static char *string_skip_whitespace(char *string);
static void string_trim_trailing_whitespace(char *string);
static char *
string_skip_whitespace(char *string)
{
while (*string && ((*string == ' ') || (*string == '\t'))) {
string++;
}
return (string);
}
static void
string_trim_trailing_whitespace(char *string)
{
char *end;
if (*string == '\0')
return;
end = string + strlen(string) - 1;
while (end != string) {
if ((*end == ' ') || (*end == '\t')) {
*end = '\0';
end--;
} else {
return;
}
}
return;
}
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);
}
}
/*
* 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_tag_t t;
acl_perm_t p;
acl_t acl;
char *mybuf_p, *line, *cur, *notcomment, *comment, *entry;
char *tag, *qualifier, *permission;
int error;
uid_t id;
/* Local copy we can mess up. */
mybuf_p = strdup(buf_p);
if (mybuf_p == NULL)
return(NULL);
acl = acl_init(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(¬comment, ","))) {
/* Now split into three ':' delimited fields. */
tag = strsep(&entry, ":");
if (tag == NULL) {
errno = EINVAL;
goto error_label;
}
tag = string_skip_whitespace(tag);
if ((*tag == '\0') && (!entry)) {
/*
* Is an entirely comment line, skip to next
* comma.
*/
continue;
}
string_trim_trailing_whitespace(tag);
qualifier = strsep(&entry, ":");
if (qualifier == NULL) {
errno = EINVAL;
goto error_label;
}
qualifier = string_skip_whitespace(qualifier);
string_trim_trailing_whitespace(qualifier);
permission = strsep(&entry, ":");
if (permission == NULL || entry) {
errno = EINVAL;
goto error_label;
}
permission = string_skip_whitespace(permission);
string_trim_trailing_whitespace(permission);
t = acl_string_to_tag(tag, qualifier);
if (t == -1) {
errno = EINVAL;
goto error_label;
}
error = _posix1e_acl_string_to_perm(permission, &p);
if (error == -1) {
errno = EINVAL;
goto error_label;
}
switch(t) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
if (*qualifier != '\0') {
errno = EINVAL;
goto error_label;
}
id = 0;
break;
case ACL_USER:
case ACL_GROUP:
error = _posix1e_acl_name_to_id(t, qualifier,
&id);
if (error == -1)
goto error_label;
break;
default:
errno = EINVAL;
goto error_label;
}
error = _posix1e_acl_add_entry(acl, t, id, p);
if (error == -1)
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
return(acl);
error_label:
acl_free(acl);
free(mybuf_p);
return(NULL);
}
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