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         if (acl == NULL) {
  74                 errno = EINVAL;
  75                 return(NULL);
  76         }
  77
  78         acl_int = &acl->ats_acl;
  79
  80         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  81         for (i = 0; i < acl_int->acl_cnt; i++)
  82                 if (acl_int->acl_entry[i].ae_tag == ACL_MASK)
  83                         mask_perm = acl_int->acl_entry[i].ae_perm;
  84
  85         for (i = 0; i < acl_int->acl_cnt; i++) {
  86                 ae_tag = acl_int->acl_entry[i].ae_tag;
  87                 ae_id = acl_int->acl_entry[i].ae_id;
  88                 ae_perm = acl_int->acl_entry[i].ae_perm;
  89
  90                 switch(ae_tag) {
  91                 case ACL_USER_OBJ:
  92                         error = _posix1e_acl_perm_to_string(ae_perm,
  93                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  94                         if (error)
  95                                 goto error_label;
  96                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  97                             perm_buf);
  98                         if (len == -1)
  99                                 goto error_label;
 100                         free(buf);
 101                         buf = tmpbuf;
 102                         break;
 103
 104                 case ACL_USER:
 105                         error = _posix1e_acl_perm_to_string(ae_perm,
 106                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 107                         if (error)
 108                                 goto error_label;
 109
 110                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 111                             UT_NAMESIZE+1, name_buf, flags);
 112                         if (error)
 113                                 goto error_label;
 114
 115                         effective_perm = ae_perm & mask_perm;
 116                         if (effective_perm != ae_perm) {
 117                                 error = _posix1e_acl_perm_to_string(
 118                                     effective_perm,
 119                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 120                                     effective_perm_buf);
 121                                 if (error)
 122                                         goto error_label;
 123                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 124                                     "effective: %s\n",
 125                                     buf, name_buf, perm_buf,
 126                                     effective_perm_buf);
 127                         } else {
 128                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 129                                     name_buf, perm_buf);
 130                         }
 131                         if (len == -1)
 132                                 goto error_label;
 133                         free(buf);
 134                         buf = tmpbuf;
 135                         break;
 136
 137                 case ACL_GROUP_OBJ:
 138                         error = _posix1e_acl_perm_to_string(ae_perm,
 139                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 140                         if (error)
 141                                 goto error_label;
 142
 143                         effective_perm = ae_perm & mask_perm;
 144                         if (effective_perm != ae_perm) {
 145                                 error = _posix1e_acl_perm_to_string(
 146                                     effective_perm,
 147                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 148                                     effective_perm_buf);
 149                                 if (error)
 150                                         goto error_label;
 151                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 152                                     "effective: %s\n",
 153                                     buf, perm_buf, effective_perm_buf);
 154                         } else {
 155                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 156                                     perm_buf);
 157                         }
 158                         if (len == -1)
 159                                 goto error_label;
 160                         free(buf);
 161                         buf = tmpbuf;
 162                         break;
 163
 164                 case ACL_GROUP:
 165                         error = _posix1e_acl_perm_to_string(ae_perm,
 166                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 167                         if (error)
 168                                 goto error_label;
 169
 170                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 171                             UT_NAMESIZE+1, name_buf, flags);
 172                         if (error)
 173                                 goto error_label;
 174
 175                         effective_perm = ae_perm & mask_perm;
 176                         if (effective_perm != ae_perm) {
 177                                 error = _posix1e_acl_perm_to_string(
 178                                     effective_perm,
 179                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 180                                     effective_perm_buf);
 181                                 if (error)
 182                                         goto error_label;
 183                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\t\t# "
 184                                     "effective: %s\n",
 185                                     buf, name_buf, perm_buf,
 186                                     effective_perm_buf);
 187                         } else {
 188                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 189                                     name_buf, perm_buf);
 190                         }
 191                         if (len == -1)
 192                                 goto error_label;
 193                         free(buf);
 194                         buf = tmpbuf;
 195                         break;
 196
 197                 case ACL_MASK:
 198                         error = _posix1e_acl_perm_to_string(ae_perm,
 199                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 200                         if (error)
 201                                 goto error_label;
 202
 203                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 204                             perm_buf);
 205                         if (len == -1)
 206                                 goto error_label;
 207                         free(buf);
 208                         buf = tmpbuf;
 209                         break;
 210
 211                 case ACL_OTHER:
 212                         error = _posix1e_acl_perm_to_string(ae_perm,
 213                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 214                         if (error)
 215                                 goto error_label;
 216
 217                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 218                             perm_buf);
 219                         if (len == -1)
 220                                 goto error_label;
 221                         free(buf);
 222                         buf = tmpbuf;
 223                         break;
 224
 225                 default:
 226                         errno = EINVAL;
 227                         goto error_label;
 228                 }
 229         }
 230
 231         if (len_p) {
 232                 *len_p = strlen(buf);
 233         }
 234         return (buf);
 235
 236 error_label:
 237         /* jump to here sets errno already, we just clean up */
 238         if (buf) free(buf);
 239         return (NULL);
 240 }
 241
 242 char *
 243 acl_to_text_np(acl_t acl, ssize_t *len_p, int flags)
 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 }