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/param.h>
  34 #include <sys/acl.h>
  35 #include <sys/errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include "acl_support.h"
  41
  42 /*
  43  * acl_to_text - generate a text form of an acl
  44  * spec says nothing about output ordering, so leave in acl order
  45  *
  46  * This function will not produce nice results if it is called with
  47  * a non-POSIX.1e semantics ACL.
  48  */
  49 char *
  50 acl_to_text(acl_t acl, ssize_t *len_p)
  51 {
  52         char    *buf, *tmpbuf;
  53         char    name_buf[MAXLOGNAME];
  54         char    perm_buf[ACL_STRING_PERM_MAXSIZE+1],
  55                 effective_perm_buf[ACL_STRING_PERM_MAXSIZE+1];
  56         int     i, error, len;
  57         uid_t   ae_id;
  58         acl_tag_t       ae_tag;
  59         acl_perm_t      ae_perm, effective_perm, mask_perm;
  60
  61         buf = strdup("");
  62
  63         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  64         for (i = 0; i < acl->acl_cnt; i++)
  65                 if (acl->acl_entry[i].ae_tag == ACL_MASK)
  66                         mask_perm = acl->acl_entry[i].ae_perm;
  67
  68         for (i = 0; i < acl->acl_cnt; i++) {
  69                 ae_tag = acl->acl_entry[i].ae_tag;
  70                 ae_id = acl->acl_entry[i].ae_id;
  71                 ae_perm = acl->acl_entry[i].ae_perm;
  72
  73                 switch(ae_tag) {
  74                 case ACL_USER_OBJ:
  75                         error = acl_perm_to_string(ae_perm,
  76                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  77                         if (error)
  78                                 goto error_label;
  79                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  80                             perm_buf);
  81                         if (len == -1) {
  82                                 errno = ENOMEM;
  83                                 goto error_label;
  84                         }
  85                         free(buf);
  86                         buf = tmpbuf;
  87                         break;
  88
  89                 case ACL_USER:
  90                         error = acl_perm_to_string(ae_perm,
  91                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  92                         if (error)
  93                                 goto error_label;
  94
  95                         error = acl_id_to_name(ae_tag, ae_id, MAXLOGNAME,
  96                             name_buf);
  97                         if (error)
  98                                 goto error_label;
  99
 100                         effective_perm = ae_perm & mask_perm;
 101                         if (effective_perm != ae_perm) {
 102                                 error = acl_perm_to_string(effective_perm,
 103                                     ACL_STRING_PERM_MAXSIZE+1,
 104                                     effective_perm_buf);
 105                                 if (error)
 106                                         goto error_label;
 107                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 108                                     "effective: %s\n",
 109                                     buf, name_buf, perm_buf,
 110                                     effective_perm_buf);
 111                         } else {
 112                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 113                                     name_buf, perm_buf);
 114                         }
 115                         if (len == -1) {
 116                                 errno = ENOMEM;
 117                                 goto error_label;
 118                         }
 119                         free(buf);
 120                         buf = tmpbuf;
 121                         break;
 122
 123                 case ACL_GROUP_OBJ:
 124                         error = acl_perm_to_string(ae_perm,
 125                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 126                         if (error)
 127                                 goto error_label;
 128
 129                         effective_perm = ae_perm & mask_perm;
 130                         if (effective_perm != ae_perm) {
 131                                 error = acl_perm_to_string(effective_perm,
 132                                     ACL_STRING_PERM_MAXSIZE+1,
 133                                     effective_perm_buf);
 134                                 if (error)
 135                                         goto error_label;
 136                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 137                                     "effective: %s\n",
 138                                     buf, perm_buf, effective_perm_buf);
 139                         } else {
 140                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 141                                     perm_buf);
 142                         }
 143                         if (len == -1) {
 144                                 errno = ENOMEM;
 145                                 goto error_label;
 146                         }
 147                         free(buf);
 148                         buf = tmpbuf;
 149                         break;
 150
 151                 case ACL_GROUP:
 152                         error = acl_perm_to_string(ae_perm,
 153                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 154                         if (error)
 155                                 goto error_label;
 156
 157                         error = acl_id_to_name(ae_tag, ae_id, MAXLOGNAME,
 158                             name_buf);
 159                         if (error)
 160                                 goto error_label;
 161
 162                         effective_perm = ae_perm & mask_perm;
 163                         if (effective_perm != ae_perm) {
 164                                 error = acl_perm_to_string(effective_perm,
 165                                     ACL_STRING_PERM_MAXSIZE+1,
 166                                     effective_perm_buf);
 167                                 if (error)
 168                                         goto error_label;
 169                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 170                                     "effective: %s\n",
 171                                     buf, perm_buf, effective_perm_buf);
 172                         } else {
 173                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 174                                     name_buf, perm_buf);
 175                         }
 176                         if (len == -1) {
 177                                 errno = ENOMEM;
 178                                 goto error_label;
 179                         }
 180                         free(buf);
 181                         buf = tmpbuf;
 182                         break;
 183
 184                 case ACL_MASK:
 185                         error = acl_perm_to_string(ae_perm,
 186                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 187                         if (error)
 188                                 goto error_label;
 189
 190                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 191                             perm_buf);
 192                         if (len == -1) {
 193                                 errno = ENOMEM;
 194                                 goto error_label;
 195                         }
 196                         free(buf);
 197                         buf = tmpbuf;
 198                         break;
 199
 200                 case ACL_OTHER:
 201                         error = acl_perm_to_string(ae_perm,
 202                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 203                         if (error)
 204                                 goto error_label;
 205
 206                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 207                             perm_buf);
 208                         if (len == -1) {
 209                                 errno = ENOMEM;
 210                                 goto error_label;
 211                         }
 212                         free(buf);
 213                         buf = tmpbuf;
 214                         break;
 215
 216                 default:
 217                         free(buf);
 218                         errno = EINVAL;
 219                         return (0);
 220                 }
 221         }
 222
 223         if (len_p) {
 224                 *len_p = strlen(buf);
 225         }
 226         return (buf);
 227
 228 error_label:
 229         /* jump to here sets errno already, we just clean up */
 230         if (buf) free(buf);
 231         return (0);
 232 }