283 lines
6.5 KiB
C
283 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include <string.h>
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#include <pwd.h>
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#include <grp.h>
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#include <ctype.h>
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#include <err.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/acl.h>
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#include "acl_support.h"
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#define MAX_ENTRY_LENGTH 512
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/*
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* Parse the tag field of ACL entry passed as "str". If qualifier
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* needs to follow, then the variable referenced by "need_qualifier"
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* is set to 1, otherwise it's set to 0.
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*/
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static int
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parse_tag(const char *str, acl_entry_t entry, int *need_qualifier)
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{
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assert(need_qualifier != NULL);
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*need_qualifier = 0;
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if (strcmp(str, "owner@") == 0)
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return (acl_set_tag_type(entry, ACL_USER_OBJ));
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if (strcmp(str, "group@") == 0)
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return (acl_set_tag_type(entry, ACL_GROUP_OBJ));
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if (strcmp(str, "everyone@") == 0)
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return (acl_set_tag_type(entry, ACL_EVERYONE));
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*need_qualifier = 1;
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if (strcmp(str, "user") == 0 || strcmp(str, "u") == 0)
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return (acl_set_tag_type(entry, ACL_USER));
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if (strcmp(str, "group") == 0 || strcmp(str, "g") == 0)
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return (acl_set_tag_type(entry, ACL_GROUP));
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warnx("malformed ACL: invalid \"tag\" field");
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return (-1);
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}
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/*
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* Parse the qualifier field of ACL entry passed as "str".
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* If user or group name cannot be resolved, then the variable
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* referenced by "need_qualifier" is set to 1; it will be checked
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* later to figure out whether the appended_id is required.
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*/
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static int
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parse_qualifier(char *str, acl_entry_t entry, int *need_qualifier)
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{
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int qualifier_length, error;
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uid_t id;
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acl_tag_t tag;
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assert(need_qualifier != NULL);
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*need_qualifier = 0;
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qualifier_length = strlen(str);
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if (qualifier_length == 0) {
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warnx("malformed ACL: empty \"qualifier\" field");
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return (-1);
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}
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error = acl_get_tag_type(entry, &tag);
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if (error)
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return (error);
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error = _acl_name_to_id(tag, str, &id);
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if (error) {
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*need_qualifier = 1;
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return (0);
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}
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return (acl_set_qualifier(entry, &id));
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}
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static int
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parse_access_mask(char *str, acl_entry_t entry)
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{
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int error;
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acl_perm_t perm;
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error = _nfs4_parse_access_mask(str, &perm);
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if (error)
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return (error);
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error = acl_set_permset(entry, &perm);
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return (error);
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}
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static int
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parse_flags(char *str, acl_entry_t entry)
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{
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int error;
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acl_flag_t flags;
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error = _nfs4_parse_flags(str, &flags);
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if (error)
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return (error);
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error = acl_set_flagset_np(entry, &flags);
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return (error);
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}
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static int
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parse_entry_type(const char *str, acl_entry_t entry)
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{
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if (strcmp(str, "allow") == 0)
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return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALLOW));
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if (strcmp(str, "deny") == 0)
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return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_DENY));
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if (strcmp(str, "audit") == 0)
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return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_AUDIT));
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if (strcmp(str, "alarm") == 0)
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return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALARM));
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warnx("malformed ACL: invalid \"type\" field");
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return (-1);
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}
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static int
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parse_appended_id(char *str, acl_entry_t entry)
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{
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int qualifier_length;
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char *end;
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id_t id;
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qualifier_length = strlen(str);
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if (qualifier_length == 0) {
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warnx("malformed ACL: \"appended id\" field present, "
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"but empty");
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return (-1);
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}
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id = strtod(str, &end);
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if (end - str != qualifier_length) {
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warnx("malformed ACL: appended id is not a number");
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return (-1);
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}
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return (acl_set_qualifier(entry, &id));
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}
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static int
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number_of_colons(const char *str)
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{
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int count = 0;
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while (*str != '\0') {
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if (*str == ':')
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count++;
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str++;
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}
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return (count);
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}
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int
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_nfs4_acl_entry_from_text(acl_t aclp, char *str)
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{
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int error, need_qualifier;
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acl_entry_t entry;
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char *field, *qualifier_field;
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error = acl_create_entry(&aclp, &entry);
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if (error)
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return (error);
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assert(_entry_brand(entry) == ACL_BRAND_NFS4);
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if (str == NULL)
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goto truncated_entry;
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field = strsep(&str, ":");
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field = string_skip_whitespace(field);
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if ((*field == '\0') && (!str)) {
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/*
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* Is an entirely comment line, skip to next
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* comma.
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*/
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return (0);
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}
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error = parse_tag(field, entry, &need_qualifier);
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if (error)
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goto malformed_field;
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if (need_qualifier) {
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if (str == NULL)
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goto truncated_entry;
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qualifier_field = field = strsep(&str, ":");
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error = parse_qualifier(field, entry, &need_qualifier);
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if (error)
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goto malformed_field;
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}
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if (str == NULL)
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goto truncated_entry;
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field = strsep(&str, ":");
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error = parse_access_mask(field, entry);
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if (error)
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goto malformed_field;
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if (str == NULL)
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goto truncated_entry;
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/* Do we have "flags" field? */
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if (number_of_colons(str) > 0) {
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field = strsep(&str, ":");
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error = parse_flags(field, entry);
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if (error)
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goto malformed_field;
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}
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if (str == NULL)
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goto truncated_entry;
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field = strsep(&str, ":");
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error = parse_entry_type(field, entry);
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if (error)
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goto malformed_field;
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if (need_qualifier) {
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if (str == NULL) {
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warnx("malformed ACL: unknown user or group name "
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"\"%s\"", qualifier_field);
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goto truncated_entry;
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}
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error = parse_appended_id(str, entry);
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if (error)
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goto malformed_field;
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}
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return (0);
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truncated_entry:
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malformed_field:
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acl_delete_entry(aclp, entry);
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errno = EINVAL;
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return (-1);
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}
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