bin/setfacl/merge.c

   1 /*-
   2  * Copyright (c) 2001 Chris D. Faulhaber
   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 #include <sys/types.h>
  28 #include <sys/acl.h>
  29 #include <sys/stat.h>
  30
  31 #include <err.h>
  32
  33 #include "setfacl.h"
  34
  35 static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new,
  36     int acl_brand);
  37
  38 static int
  39 merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new, int acl_brand)
  40 {
  41         acl_permset_t permset;
  42         acl_entry_type_t entry_type;
  43         acl_flagset_t flagset;
  44         int have_entry;
  45         uid_t *id, *id_new;
  46
  47         have_entry = 0;
  48
  49         id = acl_get_qualifier(*entry);
  50         if (id == NULL)
  51                 err(1, "acl_get_qualifier() failed");
  52         id_new = acl_get_qualifier(*entry_new);
  53         if (id_new == NULL)
  54                 err(1, "acl_get_qualifier() failed");
  55         if (*id == *id_new) {
  56                 /* any other matches */
  57                 if (acl_get_permset(*entry, &permset) == -1)
  58                         err(1, "acl_get_permset() failed");
  59                 if (acl_set_permset(*entry_new, permset) == -1)
  60                         err(1, "acl_set_permset() failed");
  61
  62                 if (acl_brand == ACL_BRAND_NFS4) {
  63                         if (acl_get_entry_type_np(*entry, &entry_type))
  64                                 err(1, "acl_get_entry_type_np() failed");
  65                         if (acl_set_entry_type_np(*entry_new, entry_type))
  66                                 err(1, "acl_set_entry_type_np() failed");
  67                         if (acl_get_flagset_np(*entry, &flagset))
  68                                 err(1, "acl_get_flagset_np() failed");
  69                         if (acl_set_flagset_np(*entry_new, flagset))
  70                                 err(1, "acl_set_flagset_np() failed");
  71                 }
  72
  73                 have_entry = 1;
  74         }
  75         acl_free(id);
  76         acl_free(id_new);
  77
  78         return (have_entry);
  79 }
  80
  81 /*
  82  * merge an ACL into existing file's ACL
  83  */
  84 int
  85 merge_acl(acl_t acl, acl_t *prev_acl, const char *filename)
  86 {
  87         acl_entry_t entry, entry_new;
  88         acl_permset_t permset;
  89         acl_t acl_new;
  90         acl_tag_t tag, tag_new;
  91         acl_entry_type_t entry_type, entry_type_new;
  92         acl_flagset_t flagset;
  93         int entry_id, entry_id_new, have_entry, had_entry, entry_number = 0;
  94         int acl_brand, prev_acl_brand;
  95
  96         acl_get_brand_np(acl, &acl_brand);
  97         acl_get_brand_np(*prev_acl, &prev_acl_brand);
  98
  99         if (branding_mismatch(acl_brand, prev_acl_brand)) {
 100                 warnx("%s: branding mismatch; existing ACL is %s, "
 101                     "entry to be merged is %s", filename,
 102                     brand_name(prev_acl_brand), brand_name(acl_brand));
 103                 return (-1);
 104         }
 105
 106         acl_new = acl_dup(*prev_acl);
 107         if (acl_new == NULL)
 108                 err(1, "%s: acl_dup() failed", filename);
 109
 110         entry_id = ACL_FIRST_ENTRY;
 111
 112         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 113                 entry_id = ACL_NEXT_ENTRY;
 114                 have_entry = 0;
 115                 had_entry = 0;
 116
 117                 /* keep track of existing ACL_MASK entries */
 118                 if (acl_get_tag_type(entry, &tag) == -1)
 119                         err(1, "%s: acl_get_tag_type() failed - "
 120                             "invalid ACL entry", filename);
 121                 if (tag == ACL_MASK)
 122                         have_mask = true;
 123
 124                 /* check against the existing ACL entries */
 125                 entry_id_new = ACL_FIRST_ENTRY;
 126                 while (acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
 127                         entry_id_new = ACL_NEXT_ENTRY;
 128
 129                         if (acl_get_tag_type(entry, &tag) == -1)
 130                                 err(1, "%s: acl_get_tag_type() failed",
 131                                     filename);
 132                         if (acl_get_tag_type(entry_new, &tag_new) == -1)
 133                                 err(1, "%s: acl_get_tag_type() failed",
 134                                     filename);
 135                         if (tag != tag_new)
 136                                 continue;
 137
 138                         /*
 139                          * For NFSv4, in addition to "tag" and "id" we also
 140                          * compare "entry_type".
 141                          */
 142                         if (acl_brand == ACL_BRAND_NFS4) {
 143                                 if (acl_get_entry_type_np(entry, &entry_type))
 144                                         err(1, "%s: acl_get_entry_type_np() "
 145                                             "failed", filename);
 146                                 if (acl_get_entry_type_np(entry_new, &entry_type_new))
 147                                         err(1, "%s: acl_get_entry_type_np() "
 148                                             "failed", filename);
 149                                 if (entry_type != entry_type_new)
 150                                         continue;
 151                         }
 152
 153                         switch(tag) {
 154                         case ACL_USER:
 155                         case ACL_GROUP:
 156                                 have_entry = merge_user_group(&entry,
 157                                     &entry_new, acl_brand);
 158                                 if (have_entry == 0)
 159                                         break;
 160                                 /* FALLTHROUGH */
 161                         case ACL_USER_OBJ:
 162                         case ACL_GROUP_OBJ:
 163                         case ACL_OTHER:
 164                         case ACL_MASK:
 165                         case ACL_EVERYONE:
 166                                 if (acl_get_permset(entry, &permset) == -1)
 167                                         err(1, "%s: acl_get_permset() failed",
 168                                             filename);
 169                                 if (acl_set_permset(entry_new, permset) == -1)
 170                                         err(1, "%s: acl_set_permset() failed",
 171                                             filename);
 172
 173                                 if (acl_brand == ACL_BRAND_NFS4) {
 174                                         if (acl_get_entry_type_np(entry, &entry_type))
 175                                                 err(1, "%s: acl_get_entry_type_np() failed",
 176                                                     filename);
 177                                         if (acl_set_entry_type_np(entry_new, entry_type))
 178                                                 err(1, "%s: acl_set_entry_type_np() failed",
 179                                                     filename);
 180                                         if (acl_get_flagset_np(entry, &flagset))
 181                                                 err(1, "%s: acl_get_flagset_np() failed",
 182                                                     filename);
 183                                         if (acl_set_flagset_np(entry_new, flagset))
 184                                                 err(1, "%s: acl_set_flagset_np() failed",
 185                                                     filename);
 186                                 }
 187                                 had_entry = have_entry = 1;
 188                                 break;
 189                         default:
 190                                 /* should never be here */
 191                                 errx(1, "%s: invalid tag type: %i", filename, tag);
 192                                 break;
 193                         }
 194                 }
 195
 196                 /* if this entry has not been found, it must be new */
 197                 if (had_entry == 0) {
 198
 199                         /*
 200                          * NFSv4 ACL entries must be prepended to the ACL.
 201                          * Appending them at the end makes no sense, since
 202                          * in most cases they wouldn't even get evaluated.
 203                          */
 204                         if (acl_brand == ACL_BRAND_NFS4) {
 205                                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 206                                         warn("%s: acl_create_entry_np() failed", filename);
 207                                         acl_free(acl_new);
 208                                         return (-1);
 209                                 }
 210                                 /*
 211                                  * Without this increment, adding several
 212                                  * entries at once, for example
 213                                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 214                                  * would make them appear in reverse order.
 215                                  */
 216                                 entry_number++;
 217                         } else {
 218                                 if (acl_create_entry(&acl_new, &entry_new) == -1) {
 219                                         warn("%s: acl_create_entry() failed", filename);
 220                                         acl_free(acl_new);
 221                                         return (-1);
 222                                 }
 223                         }
 224                         if (acl_copy_entry(entry_new, entry) == -1)
 225                                 err(1, "%s: acl_copy_entry() failed", filename);
 226                 }
 227         }
 228
 229         acl_free(*prev_acl);
 230         *prev_acl = acl_new;
 231
 232         return (0);
 233 }
 234
 235 int
 236 add_acl(acl_t acl, uint entry_number, acl_t *prev_acl, const char *filename)
 237 {
 238         acl_entry_t entry, entry_new;
 239         acl_t acl_new;
 240         int entry_id, acl_brand, prev_acl_brand;
 241
 242         acl_get_brand_np(acl, &acl_brand);
 243         acl_get_brand_np(*prev_acl, &prev_acl_brand);
 244
 245         if (prev_acl_brand != ACL_BRAND_NFS4) {
 246                 warnx("%s: the '-a' option is only applicable to NFSv4 ACLs",
 247                     filename);
 248                 return (-1);
 249         }
 250
 251         if (branding_mismatch(acl_brand, ACL_BRAND_NFS4)) {
 252                 warnx("%s: branding mismatch; existing ACL is NFSv4, "
 253                     "entry to be added is %s", filename,
 254                     brand_name(acl_brand));
 255                 return (-1);
 256         }
 257
 258         acl_new = acl_dup(*prev_acl);
 259         if (acl_new == NULL)
 260                 err(1, "%s: acl_dup() failed", filename);
 261
 262         entry_id = ACL_FIRST_ENTRY;
 263
 264         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 265                 entry_id = ACL_NEXT_ENTRY;
 266
 267                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 268                         warn("%s: acl_create_entry_np() failed", filename);
 269                         acl_free(acl_new);
 270                         return (-1);
 271                 }
 272
 273                 /*
 274                  * Without this increment, adding several
 275                  * entries at once, for example
 276                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 277                  * would make them appear in reverse order.
 278                  */
 279                 entry_number++;
 280
 281                 if (acl_copy_entry(entry_new, entry) == -1)
 282                         err(1, "%s: acl_copy_entry() failed", filename);
 283         }
 284
 285         acl_free(*prev_acl);
 286         *prev_acl = acl_new;
 287
 288         return (0);
 289 }