freebsd-dev/lib/libc/posix1e/acl_from_text_nfs4.c
2009-06-25 13:08:02 +00:00

313 lines
7.0 KiB
C

/*-
* Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
* 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.
*/
#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 <ctype.h>
#include <err.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/acl.h>
#include "acl_support.h"
#define MAX_ENTRY_LENGTH 512
/*
* Parse the tag field of ACL entry passed as "str". If qualifier
* needs to follow, then the variable referenced by "need_qualifier"
* is set to 1, otherwise it's set to 0.
*/
static int
parse_tag(const char *str, acl_entry_t entry, int *need_qualifier)
{
assert(need_qualifier != NULL);
*need_qualifier = 0;
if (strcmp(str, "owner@") == 0)
return (acl_set_tag_type(entry, ACL_USER_OBJ));
if (strcmp(str, "group@") == 0)
return (acl_set_tag_type(entry, ACL_GROUP_OBJ));
if (strcmp(str, "everyone@") == 0)
return (acl_set_tag_type(entry, ACL_EVERYONE));
*need_qualifier = 1;
if (strcmp(str, "user") == 0 || strcmp(str, "u") == 0)
return (acl_set_tag_type(entry, ACL_USER));
if (strcmp(str, "group") == 0 || strcmp(str, "g") == 0)
return (acl_set_tag_type(entry, ACL_GROUP));
warnx("malformed ACL: invalid \"tag\" field");
return (-1);
}
/*
* Parse the qualifier field of ACL entry passed as "str".
* If user or group name cannot be resolved, then the variable
* referenced by "need_qualifier" is set to 1.
*/
static int
parse_qualifier(char *str, acl_entry_t entry, int *need_qualifier)
{
int qualifier_length, error;
id_t id;
char *end;
struct passwd *pwd;
struct group *grp;
acl_tag_t tag;
assert(need_qualifier != NULL);
*need_qualifier = 0;
qualifier_length = strlen(str);
if (qualifier_length == 0) {
warnx("malformed ACL: empty \"qualifier\" field");
return (-1);
}
/* XXX: Can we assume that valid username never begins with a digit? */
if (isdigit(str[0])) {
id = strtod(str, &end);
if (end - str != qualifier_length) {
warnx("malformed ACL: trailing characters "
"after numerical id");
return (-1);
}
return (acl_set_qualifier(entry, &id));
}
error = acl_get_tag_type(entry, &tag);
if (error)
return (error);
assert(tag == ACL_USER || tag == ACL_GROUP);
if (tag == ACL_USER) {
/* XXX: Thread-unsafe. */
pwd = getpwnam(str);
if (pwd == NULL) {
*need_qualifier = 1;
return (0);
}
return (acl_set_qualifier(entry, &(pwd->pw_uid)));
}
/* XXX: Thread-unsafe. */
grp = getgrnam(str);
if (grp == NULL) {
*need_qualifier = 1;
return (0);
}
return (acl_set_qualifier(entry, &(grp->gr_gid)));
}
static int
parse_access_mask(char *str, acl_entry_t entry)
{
int error;
acl_perm_t perm;
error = _nfs4_parse_access_mask(str, &perm);
if (error)
return (error);
error = acl_set_permset(entry, &perm);
return (error);
}
static int
parse_flags(char *str, acl_entry_t entry)
{
int error;
acl_flag_t flags;
error = _nfs4_parse_flags(str, &flags);
if (error)
return (error);
error = acl_set_flagset_np(entry, &flags);
return (error);
}
static int
parse_entry_type(const char *str, acl_entry_t entry)
{
if (strcmp(str, "allow") == 0)
return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALLOW));
if (strcmp(str, "deny") == 0)
return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_DENY));
if (strcmp(str, "audit") == 0)
return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_AUDIT));
if (strcmp(str, "alarm") == 0)
return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALARM));
warnx("malformed ACL: invalid \"type\" field");
return (-1);
}
static int
parse_appended_id(char *str, acl_entry_t entry)
{
int qualifier_length;
char *end;
id_t id;
qualifier_length = strlen(str);
if (qualifier_length == 0) {
warnx("malformed ACL: \"appended id\" field present, "
"but empty");
return (-1);
}
id = strtod(str, &end);
if (end - str != qualifier_length) {
warnx("malformed ACL: appended id is not a number");
return (-1);
}
return (acl_set_qualifier(entry, &id));
}
static int
number_of_colons(const char *str)
{
int count = 0;
while (*str != '\0') {
if (*str == ':')
count++;
str++;
}
return (count);
}
int
_nfs4_acl_entry_from_text(acl_t aclp, char *str)
{
int error, need_qualifier;
acl_entry_t entry;
char *field, *qualifier_field;
error = acl_create_entry(&aclp, &entry);
if (error)
return (error);
assert(_entry_brand(entry) == ACL_BRAND_NFS4);
if (str == NULL)
goto truncated_entry;
field = strsep(&str, ":");
field = string_skip_whitespace(field);
if ((*field == '\0') && (!str)) {
/*
* Is an entirely comment line, skip to next
* comma.
*/
return (0);
}
error = parse_tag(field, entry, &need_qualifier);
if (error)
goto malformed_field;
if (need_qualifier) {
if (str == NULL)
goto truncated_entry;
qualifier_field = field = strsep(&str, ":");
error = parse_qualifier(field, entry, &need_qualifier);
if (error)
goto malformed_field;
}
if (str == NULL)
goto truncated_entry;
field = strsep(&str, ":");
error = parse_access_mask(field, entry);
if (error)
goto malformed_field;
if (str == NULL)
goto truncated_entry;
/* Do we have "flags" field? */
if (number_of_colons(str) > 0) {
field = strsep(&str, ":");
error = parse_flags(field, entry);
if (error)
goto malformed_field;
}
if (str == NULL)
goto truncated_entry;
field = strsep(&str, ":");
error = parse_entry_type(field, entry);
if (error)
goto malformed_field;
if (need_qualifier) {
if (str == NULL) {
warnx("malformed ACL: unknown user or group name "
"\"%s\"", qualifier_field);
goto truncated_entry;
}
error = parse_appended_id(str, entry);
if (error)
goto malformed_field;
}
return (0);
truncated_entry:
malformed_field:
acl_delete_entry(aclp, entry);
errno = EINVAL;
return (-1);
}