4813511138
acl_from_text.c. Since acl_from_text.c is the only place it is used, we can now make this internal utility function "static." As a bonus, acl_set_fd() no longer pulls in getpwuid() for no reason. MFC after: 7 days
290 lines
6.7 KiB
C
290 lines
6.7 KiB
C
/*-
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* Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
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* All rights reserved.
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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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/*
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* acl_from_text: Convert a text-form ACL from a string to an acl_t.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include "namespace.h"
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#include <sys/acl.h>
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#include "un-namespace.h"
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#include <sys/errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "acl_support.h"
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static int _posix1e_acl_name_to_id(acl_tag_t tag, char *name, uid_t *id);
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static acl_tag_t acl_string_to_tag(char *tag, char *qualifier);
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static char *string_skip_whitespace(char *string);
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static void string_trim_trailing_whitespace(char *string);
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static char *
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string_skip_whitespace(char *string)
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{
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while (*string && ((*string == ' ') || (*string == '\t'))) {
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string++;
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}
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return (string);
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}
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static void
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string_trim_trailing_whitespace(char *string)
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{
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char *end;
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if (*string == '\0')
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return;
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end = string + strlen(string) - 1;
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while (end != string) {
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if ((*end == ' ') || (*end == '\t')) {
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*end = '\0';
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end--;
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} else {
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return;
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}
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}
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return;
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}
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static acl_tag_t
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acl_string_to_tag(char *tag, char *qualifier)
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{
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if (*qualifier == '\0') {
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if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
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return (ACL_USER_OBJ);
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} else
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if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
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return (ACL_GROUP_OBJ);
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} else
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if ((!strcmp(tag, "mask")) || (!strcmp(tag, "m"))) {
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return (ACL_MASK);
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} else
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if ((!strcmp(tag, "other")) || (!strcmp(tag, "o"))) {
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return (ACL_OTHER);
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} else
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return(-1);
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} else {
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if ((!strcmp(tag, "user")) || (!strcmp(tag, "u"))) {
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return(ACL_USER);
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} else
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if ((!strcmp(tag, "group")) || (!strcmp(tag, "g"))) {
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return(ACL_GROUP);
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} else
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return(-1);
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}
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}
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/*
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* acl_from_text -- Convert a string into an ACL.
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* Postpone most validity checking until the end and call acl_valid() to do
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* that.
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*/
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acl_t
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acl_from_text(const char *buf_p)
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{
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acl_tag_t t;
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acl_perm_t p;
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acl_t acl;
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char *mybuf_p, *line, *cur, *notcomment, *comment, *entry;
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char *tag, *qualifier, *permission;
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int error;
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uid_t id;
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/* Local copy we can mess up. */
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mybuf_p = strdup(buf_p);
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if (mybuf_p == NULL)
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return(NULL);
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acl = acl_init(3);
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if (acl == NULL) {
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free(mybuf_p);
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return(NULL);
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}
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/* Outer loop: delimit at \n boundaries. */
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cur = mybuf_p;
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while ((line = strsep(&cur, "\n"))) {
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/* Now split the line on the first # to strip out comments. */
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comment = line;
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notcomment = strsep(&comment, "#");
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/* Inner loop: delimit at ',' boundaries. */
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while ((entry = strsep(¬comment, ","))) {
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/* Now split into three ':' delimited fields. */
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tag = strsep(&entry, ":");
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if (tag == NULL) {
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errno = EINVAL;
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goto error_label;
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}
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tag = string_skip_whitespace(tag);
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if ((*tag == '\0') && (!entry)) {
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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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continue;
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}
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string_trim_trailing_whitespace(tag);
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qualifier = strsep(&entry, ":");
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if (qualifier == NULL) {
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errno = EINVAL;
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goto error_label;
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}
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qualifier = string_skip_whitespace(qualifier);
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string_trim_trailing_whitespace(qualifier);
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permission = strsep(&entry, ":");
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if (permission == NULL || entry) {
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errno = EINVAL;
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goto error_label;
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}
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permission = string_skip_whitespace(permission);
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string_trim_trailing_whitespace(permission);
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t = acl_string_to_tag(tag, qualifier);
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if (t == -1) {
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errno = EINVAL;
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goto error_label;
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}
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error = _posix1e_acl_string_to_perm(permission, &p);
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if (error == -1) {
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errno = EINVAL;
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goto error_label;
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}
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switch(t) {
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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if (*qualifier != '\0') {
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errno = EINVAL;
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goto error_label;
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}
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id = 0;
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break;
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case ACL_USER:
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case ACL_GROUP:
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error = _posix1e_acl_name_to_id(t, qualifier,
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&id);
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if (error == -1)
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goto error_label;
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break;
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default:
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errno = EINVAL;
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goto error_label;
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}
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error = _posix1e_acl_add_entry(acl, t, id, p);
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if (error == -1)
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goto error_label;
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}
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}
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#if 0
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/* XXX Should we only return ACLs valid according to acl_valid? */
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/* Verify validity of the ACL we read in. */
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if (acl_valid(acl) == -1) {
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errno = EINVAL;
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goto error_label;
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}
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#endif
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return(acl);
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error_label:
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acl_free(acl);
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free(mybuf_p);
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return(NULL);
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}
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/*
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* Given a username/groupname from a text form of an ACL, return the uid/gid
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* XXX NOT THREAD SAFE, RELIES ON GETPWNAM, GETGRNAM
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* XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
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* MAY HAVE SIDE-EFFECTS
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*
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* XXX currently doesn't deal correctly with a numeric uid being passed
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* instead of a username. What is correct behavior here? Check chown.
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*/
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static int
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_posix1e_acl_name_to_id(acl_tag_t tag, char *name, uid_t *id)
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{
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struct group *g;
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struct passwd *p;
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unsigned long l;
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char *endp;
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switch(tag) {
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case ACL_USER:
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p = getpwnam(name);
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if (p == NULL) {
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l = strtoul(name, &endp, 0);
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if (*endp != '\0' || l != (unsigned long)(uid_t)l) {
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errno = EINVAL;
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return (-1);
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}
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*id = (uid_t)l;
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return (0);
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}
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*id = p->pw_uid;
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return (0);
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case ACL_GROUP:
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g = getgrnam(name);
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if (g == NULL) {
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l = strtoul(name, &endp, 0);
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if (*endp != '\0' || l != (unsigned long)(gid_t)l) {
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errno = EINVAL;
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return (-1);
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}
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*id = (gid_t)l;
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return (0);
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}
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*id = g->gr_gid;
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return (0);
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default:
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return (EINVAL);
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}
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}
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