515d7c92d3
interface. This commit introduces the library, as well as a modest subset of the ACL calls, with some modifications to support multiple ACL semantics. Reviewed by: eivind
245 lines
6.0 KiB
C
245 lines
6.0 KiB
C
/*-
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* Copyright (c) 1999 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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* $FreeBSD$
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*/
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/*
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* acl_to_text - return a text string with a text representation of the acl
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* in it.
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*/
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#include <sys/types.h>
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#include <sys/acl.h>
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#include <sys/errno.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 <utmp.h>
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#include "acl_support.h"
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/*
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* acl_to_text - generate a text form of an acl
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* spec says nothing about output ordering, so leave in acl order
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*
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* For the time-being, reject the printing of ACLs that aren't an
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* understood semantic. Later on, we might want to try and have a
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* generic printing mechanism...
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*/
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char *
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acl_to_text(acl_t acl, ssize_t *len_p)
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{
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char *buf, *tmpbuf;
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char name_buf[UT_NAMESIZE+1];
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char perm_buf[ACL_STRING_PERM_MAXSIZE+1],
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effective_perm_buf[ACL_STRING_PERM_MAXSIZE+1];
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int i, error, len;
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uid_t ae_id;
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acl_tag_t ae_tag;
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acl_perm_t ae_perm, effective_perm, mask_perm;
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if (!acl_posix1e(acl)) {
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errno = EINVAL;
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return (0);
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}
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buf = strdup("");
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mask_perm = ACL_PERM_BITS; /* effective is regular if no mask */
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for (i = 0; i < acl->acl_cnt; i++)
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if (acl->acl_entry[i].ae_tag == ACL_MASK)
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mask_perm = acl->acl_entry[i].ae_perm;
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for (i = 0; i < acl->acl_cnt; i++) {
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ae_tag = acl->acl_entry[i].ae_tag;
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ae_id = acl->acl_entry[i].ae_id;
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ae_perm = acl->acl_entry[i].ae_perm;
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switch(ae_tag) {
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case ACL_USER_OBJ:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%suser::%s\n", buf,
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perm_buf);
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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case ACL_USER:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
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name_buf);
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if (error)
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goto error_label;
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effective_perm = ae_perm & mask_perm;
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if (effective_perm != ae_perm) {
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error = acl_perm_to_string(effective_perm,
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ACL_STRING_PERM_MAXSIZE+1,
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effective_perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
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"effective: %s\n",
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buf, name_buf, perm_buf,
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effective_perm_buf);
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} else {
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len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
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name_buf, perm_buf);
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}
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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case ACL_GROUP_OBJ:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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effective_perm = ae_perm & mask_perm;
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if (effective_perm != ae_perm) {
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error = acl_perm_to_string(effective_perm,
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ACL_STRING_PERM_MAXSIZE+1,
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effective_perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
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"effective: %s\n",
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buf, perm_buf, effective_perm_buf);
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} else {
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len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
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perm_buf);
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}
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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case ACL_GROUP:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
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name_buf);
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if (error)
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goto error_label;
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effective_perm = ae_perm & mask_perm;
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if (effective_perm != ae_perm) {
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error = acl_perm_to_string(effective_perm,
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ACL_STRING_PERM_MAXSIZE+1,
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effective_perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
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"effective: %s\n",
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buf, perm_buf, effective_perm_buf);
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} else {
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len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
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name_buf, perm_buf);
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}
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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case ACL_MASK:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%smask::%s\n", buf,
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perm_buf);
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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case ACL_OTHER:
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error = acl_perm_to_string(ae_perm,
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ACL_STRING_PERM_MAXSIZE+1, perm_buf);
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if (error)
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goto error_label;
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len = asprintf(&tmpbuf, "%sother::%s\n", buf,
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perm_buf);
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if (len == -1) {
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errno = ENOMEM;
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goto error_label;
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}
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free(buf);
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buf = tmpbuf;
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break;
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default:
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free(buf);
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errno = EINVAL;
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return (0);
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}
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}
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if (len_p) {
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*len_p = strlen(buf);
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}
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return (buf);
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error_label:
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/* jump to here sets errno already, we just clean up */
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if (buf) free(buf);
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return (0);
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}
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