lib/libposix1e/acl_to_text.c

   1 /*-
   2  * Copyright (c) 1999 Robert N. M. Watson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $FreeBSD: src/lib/libposix1e/acl_to_text.c,v 1.2 2000/01/26 04:19:38 rwatson Exp $
  27  */
  28 /*
  29  * acl_to_text - return a text string with a text representation of the acl
  30  * in it.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/acl.h>
  35 #include <sys/errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <utmp.h>
  40
  41 #include "acl_support.h"
  42
  43 /*
  44  * acl_to_text - generate a text form of an acl
  45  * spec says nothing about output ordering, so leave in acl order
  46  *
  47  * This function will not produce nice results if it is called with
  48  * a non-POSIX.1e semantics ACL.
  49  */
  50 char *
  51 acl_to_text(acl_t acl, ssize_t *len_p)
  52 {
  53         char    *buf, *tmpbuf;
  54         char    name_buf[UT_NAMESIZE+1];
  55         char    perm_buf[ACL_STRING_PERM_MAXSIZE+1],
  56                 effective_perm_buf[ACL_STRING_PERM_MAXSIZE+1];
  57         int     i, error, len;
  58         uid_t   ae_id;
  59         acl_tag_t       ae_tag;
  60         acl_perm_t      ae_perm, effective_perm, mask_perm;
  61
  62         buf = strdup("");
  63
  64         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  65         for (i = 0; i < acl->acl_cnt; i++)
  66                 if (acl->acl_entry[i].ae_tag == ACL_MASK)
  67                         mask_perm = acl->acl_entry[i].ae_perm;
  68
  69         for (i = 0; i < acl->acl_cnt; i++) {
  70                 ae_tag = acl->acl_entry[i].ae_tag;
  71                 ae_id = acl->acl_entry[i].ae_id;
  72                 ae_perm = acl->acl_entry[i].ae_perm;
  73
  74                 switch(ae_tag) {
  75                 case ACL_USER_OBJ:
  76                         error = acl_perm_to_string(ae_perm,
  77                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  78                         if (error)
  79                                 goto error_label;
  80                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  81                             perm_buf);
  82                         if (len == -1) {
  83                                 errno = ENOMEM;
  84                                 goto error_label;
  85                         }
  86                         free(buf);
  87                         buf = tmpbuf;
  88                         break;
  89
  90                 case ACL_USER:
  91                         error = acl_perm_to_string(ae_perm,
  92                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  93                         if (error)
  94                                 goto error_label;
  95
  96                         error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
  97                             name_buf);
  98                         if (error)
  99                                 goto error_label;
 100
 101                         effective_perm = ae_perm & mask_perm;
 102                         if (effective_perm != ae_perm) {
 103                                 error = acl_perm_to_string(effective_perm,
 104                                     ACL_STRING_PERM_MAXSIZE+1,
 105                                     effective_perm_buf);
 106                                 if (error)
 107                                         goto error_label;
 108                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 109                                     "effective: %s\n",
 110                                     buf, name_buf, perm_buf,
 111                                     effective_perm_buf);
 112                         } else {
 113                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 114                                     name_buf, perm_buf);
 115                         }
 116                         if (len == -1) {
 117                                 errno = ENOMEM;
 118                                 goto error_label;
 119                         }
 120                         free(buf);
 121                         buf = tmpbuf;
 122                         break;
 123
 124                 case ACL_GROUP_OBJ:
 125                         error = acl_perm_to_string(ae_perm,
 126                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 127                         if (error)
 128                                 goto error_label;
 129
 130                         effective_perm = ae_perm & mask_perm;
 131                         if (effective_perm != ae_perm) {
 132                                 error = acl_perm_to_string(effective_perm,
 133                                     ACL_STRING_PERM_MAXSIZE+1,
 134                                     effective_perm_buf);
 135                                 if (error)
 136                                         goto error_label;
 137                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 138                                     "effective: %s\n",
 139                                     buf, perm_buf, effective_perm_buf);
 140                         } else {
 141                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 142                                     perm_buf);
 143                         }
 144                         if (len == -1) {
 145                                 errno = ENOMEM;
 146                                 goto error_label;
 147                         }
 148                         free(buf);
 149                         buf = tmpbuf;
 150                         break;
 151
 152                 case ACL_GROUP:
 153                         error = acl_perm_to_string(ae_perm,
 154                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 155                         if (error)
 156                                 goto error_label;
 157
 158                         error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
 159                             name_buf);
 160                         if (error)
 161                                 goto error_label;
 162
 163                         effective_perm = ae_perm & mask_perm;
 164                         if (effective_perm != ae_perm) {
 165                                 error = acl_perm_to_string(effective_perm,
 166                                     ACL_STRING_PERM_MAXSIZE+1,
 167                                     effective_perm_buf);
 168                                 if (error)
 169                                         goto error_label;
 170                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 171                                     "effective: %s\n",
 172                                     buf, perm_buf, effective_perm_buf);
 173                         } else {
 174                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 175                                     name_buf, perm_buf);
 176                         }
 177                         if (len == -1) {
 178                                 errno = ENOMEM;
 179                                 goto error_label;
 180                         }
 181                         free(buf);
 182                         buf = tmpbuf;
 183                         break;
 184
 185                 case ACL_MASK:
 186                         error = acl_perm_to_string(ae_perm,
 187                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 188                         if (error)
 189                                 goto error_label;
 190
 191                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 192                             perm_buf);
 193                         if (len == -1) {
 194                                 errno = ENOMEM;
 195                                 goto error_label;
 196                         }
 197                         free(buf);
 198                         buf = tmpbuf;
 199                         break;
 200
 201                 case ACL_OTHER:
 202                         error = acl_perm_to_string(ae_perm,
 203                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 204                         if (error)
 205                                 goto error_label;
 206
 207                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 208                             perm_buf);
 209                         if (len == -1) {
 210                                 errno = ENOMEM;
 211                                 goto error_label;
 212                         }
 213                         free(buf);
 214                         buf = tmpbuf;
 215                         break;
 216
 217                 default:
 218                         free(buf);
 219                         errno = EINVAL;
 220                         return (0);
 221                 }
 222         }
 223
 224         if (len_p) {
 225                 *len_p = strlen(buf);
 226         }
 227         return (buf);
 228
 229 error_label:
 230         /* jump to here sets errno already, we just clean up */
 231         if (buf) free(buf);
 232         return (0);
 233 }