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  *$DragonFly: src/lib/libposix1e/acl_to_text.c,v 1.3 2005/08/04 17:27:09 drhodus Exp $
  28  */
  29 /*
  30  * acl_to_text - return a text string with a text representation of the acl
  31  * in it.
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/acl.h>
  36 #include <sys/errno.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <utmp.h>
  41
  42 #include "acl_support.h"
  43
  44 /*
  45  * acl_to_text - generate a text form of an acl
  46  * spec says nothing about output ordering, so leave in acl order
  47  *
  48  * This function will not produce nice results if it is called with
  49  * a non-POSIX.1e semantics ACL.
  50  */
  51 char *
  52 acl_to_text(acl_t acl, ssize_t *len_p)
  53 {
  54         char    *buf, *tmpbuf;
  55         char    name_buf[UT_NAMESIZE+1];
  56         char    perm_buf[ACL_STRING_PERM_MAXSIZE+1],
  57                 effective_perm_buf[ACL_STRING_PERM_MAXSIZE+1];
  58         int     i, error, len;
  59         uid_t   ae_id;
  60         acl_tag_t       ae_tag;
  61         acl_perm_t      ae_perm, effective_perm, mask_perm;
  62
  63         buf = strdup("");
  64
  65         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  66         for (i = 0; i < acl->acl_cnt; i++)
  67                 if (acl->acl_entry[i].ae_tag == ACL_MASK)
  68                         mask_perm = acl->acl_entry[i].ae_perm;
  69
  70         for (i = 0; i < acl->acl_cnt; i++) {
  71                 ae_tag = acl->acl_entry[i].ae_tag;
  72                 ae_id = acl->acl_entry[i].ae_id;
  73                 ae_perm = acl->acl_entry[i].ae_perm;
  74
  75                 switch(ae_tag) {
  76                 case ACL_USER_OBJ:
  77                         error = acl_perm_to_string(ae_perm,
  78                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  79                         if (error)
  80                                 goto error_label;
  81                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  82                             perm_buf);
  83                         if (len == -1) {
  84                                 errno = ENOMEM;
  85                                 goto error_label;
  86                         }
  87                         free(buf);
  88                         buf = tmpbuf;
  89                         break;
  90
  91                 case ACL_USER:
  92                         error = acl_perm_to_string(ae_perm,
  93                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  94                         if (error)
  95                                 goto error_label;
  96
  97                         error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
  98                             name_buf);
  99                         if (error)
 100                                 goto error_label;
 101
 102                         effective_perm = ae_perm & mask_perm;
 103                         if (effective_perm != ae_perm) {
 104                                 error = acl_perm_to_string(effective_perm,
 105                                     ACL_STRING_PERM_MAXSIZE+1,
 106                                     effective_perm_buf);
 107                                 if (error)
 108                                         goto error_label;
 109                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 110                                     "effective: %s\n",
 111                                     buf, name_buf, perm_buf,
 112                                     effective_perm_buf);
 113                         } else {
 114                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 115                                     name_buf, perm_buf);
 116                         }
 117                         if (len == -1) {
 118                                 errno = ENOMEM;
 119                                 goto error_label;
 120                         }
 121                         free(buf);
 122                         buf = tmpbuf;
 123                         break;
 124
 125                 case ACL_GROUP_OBJ:
 126                         error = acl_perm_to_string(ae_perm,
 127                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 128                         if (error)
 129                                 goto error_label;
 130
 131                         effective_perm = ae_perm & mask_perm;
 132                         if (effective_perm != ae_perm) {
 133                                 error = acl_perm_to_string(effective_perm,
 134                                     ACL_STRING_PERM_MAXSIZE+1,
 135                                     effective_perm_buf);
 136                                 if (error)
 137                                         goto error_label;
 138                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 139                                     "effective: %s\n",
 140                                     buf, perm_buf, effective_perm_buf);
 141                         } else {
 142                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 143                                     perm_buf);
 144                         }
 145                         if (len == -1) {
 146                                 errno = ENOMEM;
 147                                 goto error_label;
 148                         }
 149                         free(buf);
 150                         buf = tmpbuf;
 151                         break;
 152
 153                 case ACL_GROUP:
 154                         error = acl_perm_to_string(ae_perm,
 155                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 156                         if (error)
 157                                 goto error_label;
 158
 159                         error = acl_id_to_name(ae_tag, ae_id, UT_NAMESIZE+1,
 160                             name_buf);
 161                         if (error)
 162                                 goto error_label;
 163
 164                         effective_perm = ae_perm & mask_perm;
 165                         if (effective_perm != ae_perm) {
 166                                 error = acl_perm_to_string(effective_perm,
 167                                     ACL_STRING_PERM_MAXSIZE+1,
 168                                     effective_perm_buf);
 169                                 if (error)
 170                                         goto error_label;
 171                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 172                                     "effective: %s\n",
 173                                     buf, perm_buf, effective_perm_buf);
 174                         } else {
 175                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 176                                     name_buf, perm_buf);
 177                         }
 178                         if (len == -1) {
 179                                 errno = ENOMEM;
 180                                 goto error_label;
 181                         }
 182                         free(buf);
 183                         buf = tmpbuf;
 184                         break;
 185
 186                 case ACL_MASK:
 187                         error = acl_perm_to_string(ae_perm,
 188                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 189                         if (error)
 190                                 goto error_label;
 191
 192                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 193                             perm_buf);
 194                         if (len == -1) {
 195                                 errno = ENOMEM;
 196                                 goto error_label;
 197                         }
 198                         free(buf);
 199                         buf = tmpbuf;
 200                         break;
 201
 202                 case ACL_OTHER:
 203                         error = acl_perm_to_string(ae_perm,
 204                             ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 205                         if (error)
 206                                 goto error_label;
 207
 208                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 209                             perm_buf);
 210                         if (len == -1) {
 211                                 errno = ENOMEM;
 212                                 goto error_label;
 213                         }
 214                         free(buf);
 215                         buf = tmpbuf;
 216                         break;
 217
 218                 default:
 219                         free(buf);
 220                         errno = EINVAL;
 221                         return (0);
 222                 }
 223         }
 224
 225         if (len_p) {
 226                 *len_p = strlen(buf);
 227         }
 228         return (buf);
 229
 230 error_label:
 231         /* jump to here sets errno already, we just clean up */
 232         if (buf) free(buf);
 233         return (0);
 234 }