lib/libc/posix1e/acl_to_text.c

   1 /*-
   2  * Copyright (c) 1999-2002 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 /*
  27  * acl_to_text - return a text string with a text representation of the acl
  28  * in it.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/types.h>
  35 #include "namespace.h"
  36 #include <sys/acl.h>
  37 #include "un-namespace.h"
  38 #include <sys/errno.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <utmp.h>
  43
  44 #include "acl_support.h"
  45
  46 /*
  47  * acl_to_text - generate a text form of an acl
  48  * spec says nothing about output ordering, so leave in acl order
  49  *
  50  * This function will not produce nice results if it is called with
  51  * a non-POSIX.1e semantics ACL.
  52  */
  53
  54 char *_nfs4_acl_to_text_np(const acl_t acl, ssize_t *len_p, int flags);
  55
  56 static char *
  57 _posix1e_acl_to_text(acl_t acl, ssize_t *len_p, int flags)
  58 {
  59         struct acl      *acl_int;
  60         char            *buf, *tmpbuf;
  61         char             name_buf[UT_NAMESIZE+1];
  62         char             perm_buf[_POSIX1E_ACL_STRING_PERM_MAXSIZE+1],
  63                          effective_perm_buf[_POSIX1E_ACL_STRING_PERM_MAXSIZE+1];
  64         int              i, error, len;
  65         uid_t            ae_id;
  66         acl_tag_t        ae_tag;
  67         acl_perm_t       ae_perm, effective_perm, mask_perm;
  68
  69         buf = strdup("");
  70         if (buf == NULL)
  71                 return(NULL);
  72
  73         acl_int = &acl->ats_acl;
  74
  75         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  76         for (i = 0; i < acl_int->acl_cnt; i++)
  77                 if (acl_int->acl_entry[i].ae_tag == ACL_MASK)
  78                         mask_perm = acl_int->acl_entry[i].ae_perm;
  79
  80         for (i = 0; i < acl_int->acl_cnt; i++) {
  81                 ae_tag = acl_int->acl_entry[i].ae_tag;
  82                 ae_id = acl_int->acl_entry[i].ae_id;
  83                 ae_perm = acl_int->acl_entry[i].ae_perm;
  84
  85                 switch(ae_tag) {
  86                 case ACL_USER_OBJ:
  87                         error = _posix1e_acl_perm_to_string(ae_perm,
  88                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  89                         if (error)
  90                                 goto error_label;
  91                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  92                             perm_buf);
  93                         if (len == -1)
  94                                 goto error_label;
  95                         free(buf);
  96                         buf = tmpbuf;
  97                         break;
  98
  99                 case ACL_USER:
 100                         error = _posix1e_acl_perm_to_string(ae_perm,
 101                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 102                         if (error)
 103                                 goto error_label;
 104
 105                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 106                             UT_NAMESIZE+1, name_buf, flags);
 107                         if (error)
 108                                 goto error_label;
 109
 110                         effective_perm = ae_perm & mask_perm;
 111                         if (effective_perm != ae_perm) {
 112                                 error = _posix1e_acl_perm_to_string(
 113                                     effective_perm,
 114                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 115                                     effective_perm_buf);
 116                                 if (error)
 117                                         goto error_label;
 118                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 119                                     "effective: %s\n",
 120                                     buf, name_buf, perm_buf,
 121                                     effective_perm_buf);
 122                         } else {
 123                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 124                                     name_buf, perm_buf);
 125                         }
 126                         if (len == -1)
 127                                 goto error_label;
 128                         free(buf);
 129                         buf = tmpbuf;
 130                         break;
 131
 132                 case ACL_GROUP_OBJ:
 133                         error = _posix1e_acl_perm_to_string(ae_perm,
 134                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 135                         if (error)
 136                                 goto error_label;
 137
 138                         effective_perm = ae_perm & mask_perm;
 139                         if (effective_perm != ae_perm) {
 140                                 error = _posix1e_acl_perm_to_string(
 141                                     effective_perm,
 142                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 143                                     effective_perm_buf);
 144                                 if (error)
 145                                         goto error_label;
 146                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 147                                     "effective: %s\n",
 148                                     buf, perm_buf, effective_perm_buf);
 149                         } else {
 150                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 151                                     perm_buf);
 152                         }
 153                         if (len == -1)
 154                                 goto error_label;
 155                         free(buf);
 156                         buf = tmpbuf;
 157                         break;
 158
 159                 case ACL_GROUP:
 160                         error = _posix1e_acl_perm_to_string(ae_perm,
 161                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 162                         if (error)
 163                                 goto error_label;
 164
 165                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 166                             UT_NAMESIZE+1, name_buf, flags);
 167                         if (error)
 168                                 goto error_label;
 169
 170                         effective_perm = ae_perm & mask_perm;
 171                         if (effective_perm != ae_perm) {
 172                                 error = _posix1e_acl_perm_to_string(
 173                                     effective_perm,
 174                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 175                                     effective_perm_buf);
 176                                 if (error)
 177                                         goto error_label;
 178                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\t\t# "
 179                                     "effective: %s\n",
 180                                     buf, name_buf, perm_buf,
 181                                     effective_perm_buf);
 182                         } else {
 183                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 184                                     name_buf, perm_buf);
 185                         }
 186                         if (len == -1)
 187                                 goto error_label;
 188                         free(buf);
 189                         buf = tmpbuf;
 190                         break;
 191
 192                 case ACL_MASK:
 193                         error = _posix1e_acl_perm_to_string(ae_perm,
 194                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 195                         if (error)
 196                                 goto error_label;
 197
 198                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 199                             perm_buf);
 200                         if (len == -1)
 201                                 goto error_label;
 202                         free(buf);
 203                         buf = tmpbuf;
 204                         break;
 205
 206                 case ACL_OTHER:
 207                         error = _posix1e_acl_perm_to_string(ae_perm,
 208                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 209                         if (error)
 210                                 goto error_label;
 211
 212                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 213                             perm_buf);
 214                         if (len == -1)
 215                                 goto error_label;
 216                         free(buf);
 217                         buf = tmpbuf;
 218                         break;
 219
 220                 default:
 221                         errno = EINVAL;
 222                         goto error_label;
 223                 }
 224         }
 225
 226         if (len_p) {
 227                 *len_p = strlen(buf);
 228         }
 229         return (buf);
 230
 231 error_label:
 232         /* jump to here sets errno already, we just clean up */
 233         if (buf) free(buf);
 234         return (NULL);
 235 }
 236
 237 char *
 238 acl_to_text_np(acl_t acl, ssize_t *len_p, int flags)
 239 {
 240
 241         if (acl == NULL) {
 242                 errno = EINVAL;
 243                 return(NULL);
 244         }
 245
 246         switch (_acl_brand(acl)) {
 247         case ACL_BRAND_POSIX:
 248                 return (_posix1e_acl_to_text(acl, len_p, flags));
 249         case ACL_BRAND_NFS4:
 250                 return (_nfs4_acl_to_text_np(acl, len_p, flags));
 251         default:
 252                 errno = EINVAL;
 253                 return (NULL);
 254         }
 255 }
 256
 257 char *
 258 acl_to_text(acl_t acl, ssize_t *len_p)
 259 {
 260
 261         return (acl_to_text_np(acl, len_p, 0));
 262 }