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/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/types.h>
  31 #include <sys/acl.h>
  32 #include <sys/stat.h>
  33
  34 #include <err.h>
  35
  36 #include "setfacl.h"
  37
  38 static int merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new,
  39     int acl_brand);
  40
  41 static int
  42 merge_user_group(acl_entry_t *entry, acl_entry_t *entry_new, int acl_brand)
  43 {
  44         acl_permset_t permset;
  45         acl_entry_type_t entry_type;
  46         acl_flagset_t flagset;
  47         int have_entry;
  48         uid_t *id, *id_new;
  49
  50         have_entry = 0;
  51
  52         id = acl_get_qualifier(*entry);
  53         if (id == NULL)
  54                 err(1, "acl_get_qualifier() failed");
  55         id_new = acl_get_qualifier(*entry_new);
  56         if (id_new == NULL)
  57                 err(1, "acl_get_qualifier() failed");
  58         if (*id == *id_new) {
  59                 /* any other matches */
  60                 if (acl_get_permset(*entry, &permset) == -1)
  61                         err(1, "acl_get_permset() failed");
  62                 if (acl_set_permset(*entry_new, permset) == -1)
  63                         err(1, "acl_set_permset() failed");
  64
  65                 if (acl_brand == ACL_BRAND_NFS4) {
  66                         if (acl_get_entry_type_np(*entry, &entry_type))
  67                                 err(1, "acl_get_entry_type_np() failed");
  68                         if (acl_set_entry_type_np(*entry_new, entry_type))
  69                                 err(1, "acl_set_entry_type_np() failed");
  70                         if (acl_get_flagset_np(*entry, &flagset))
  71                                 err(1, "acl_get_flagset_np() failed");
  72                         if (acl_set_flagset_np(*entry_new, flagset))
  73                                 err(1, "acl_set_flagset_np() failed");
  74                 }
  75
  76                 have_entry = 1;
  77         }
  78         acl_free(id);
  79         acl_free(id_new);
  80
  81         return (have_entry);
  82 }
  83
  84 /*
  85  * merge an ACL into existing file's ACL
  86  */
  87 int
  88 merge_acl(acl_t acl, acl_t *prev_acl, const char *filename)
  89 {
  90         acl_entry_t entry, entry_new;
  91         acl_permset_t permset;
  92         acl_t acl_new;
  93         acl_tag_t tag, tag_new;
  94         acl_entry_type_t entry_type, entry_type_new;
  95         acl_flagset_t flagset;
  96         int entry_id, entry_id_new, have_entry, had_entry, entry_number = 0;
  97         int acl_brand, prev_acl_brand;
  98
  99         acl_get_brand_np(acl, &acl_brand);
 100         acl_get_brand_np(*prev_acl, &prev_acl_brand);
 101
 102         if (branding_mismatch(acl_brand, prev_acl_brand)) {
 103                 warnx("%s: branding mismatch; existing ACL is %s, "
 104                     "entry to be merged is %s", filename,
 105                     brand_name(prev_acl_brand), brand_name(acl_brand));
 106                 return (-1);
 107         }
 108
 109         acl_new = acl_dup(*prev_acl);
 110         if (acl_new == NULL)
 111                 err(1, "%s: acl_dup() failed", filename);
 112
 113         entry_id = ACL_FIRST_ENTRY;
 114
 115         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 116                 entry_id = ACL_NEXT_ENTRY;
 117                 have_entry = 0;
 118                 had_entry = 0;
 119
 120                 /* keep track of existing ACL_MASK entries */
 121                 if (acl_get_tag_type(entry, &tag) == -1)
 122                         err(1, "%s: acl_get_tag_type() failed - "
 123                             "invalid ACL entry", filename);
 124                 if (tag == ACL_MASK)
 125                         have_mask = true;
 126
 127                 /* check against the existing ACL entries */
 128                 entry_id_new = ACL_FIRST_ENTRY;
 129                 while (acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
 130                         entry_id_new = ACL_NEXT_ENTRY;
 131
 132                         if (acl_get_tag_type(entry, &tag) == -1)
 133                                 err(1, "%s: acl_get_tag_type() failed",
 134                                     filename);
 135                         if (acl_get_tag_type(entry_new, &tag_new) == -1)
 136                                 err(1, "%s: acl_get_tag_type() failed",
 137                                     filename);
 138                         if (tag != tag_new)
 139                                 continue;
 140
 141                         /*
 142                          * For NFSv4, in addition to "tag" and "id" we also
 143                          * compare "entry_type".
 144                          */
 145                         if (acl_brand == ACL_BRAND_NFS4) {
 146                                 if (acl_get_entry_type_np(entry, &entry_type))
 147                                         err(1, "%s: acl_get_entry_type_np() "
 148                                             "failed", filename);
 149                                 if (acl_get_entry_type_np(entry_new, &entry_type_new))
 150                                         err(1, "%s: acl_get_entry_type_np() "
 151                                             "failed", filename);
 152                                 if (entry_type != entry_type_new)
 153                                         continue;
 154                         }
 155
 156                         switch(tag) {
 157                         case ACL_USER:
 158                         case ACL_GROUP:
 159                                 have_entry = merge_user_group(&entry,
 160                                     &entry_new, acl_brand);
 161                                 if (have_entry == 0)
 162                                         break;
 163                                 /* FALLTHROUGH */
 164                         case ACL_USER_OBJ:
 165                         case ACL_GROUP_OBJ:
 166                         case ACL_OTHER:
 167                         case ACL_MASK:
 168                         case ACL_EVERYONE:
 169                                 if (acl_get_permset(entry, &permset) == -1)
 170                                         err(1, "%s: acl_get_permset() failed",
 171                                             filename);
 172                                 if (acl_set_permset(entry_new, permset) == -1)
 173                                         err(1, "%s: acl_set_permset() failed",
 174                                             filename);
 175
 176                                 if (acl_brand == ACL_BRAND_NFS4) {
 177                                         if (acl_get_entry_type_np(entry, &entry_type))
 178                                                 err(1, "%s: acl_get_entry_type_np() failed",
 179                                                     filename);
 180                                         if (acl_set_entry_type_np(entry_new, entry_type))
 181                                                 err(1, "%s: acl_set_entry_type_np() failed",
 182                                                     filename);
 183                                         if (acl_get_flagset_np(entry, &flagset))
 184                                                 err(1, "%s: acl_get_flagset_np() failed",
 185                                                     filename);
 186                                         if (acl_set_flagset_np(entry_new, flagset))
 187                                                 err(1, "%s: acl_set_flagset_np() failed",
 188                                                     filename);
 189                                 }
 190                                 had_entry = have_entry = 1;
 191                                 break;
 192                         default:
 193                                 /* should never be here */
 194                                 errx(1, "%s: invalid tag type: %i", filename, tag);
 195                                 break;
 196                         }
 197                 }
 198
 199                 /* if this entry has not been found, it must be new */
 200                 if (had_entry == 0) {
 201
 202                         /*
 203                          * NFSv4 ACL entries must be prepended to the ACL.
 204                          * Appending them at the end makes no sense, since
 205                          * in most cases they wouldn't even get evaluated.
 206                          */
 207                         if (acl_brand == ACL_BRAND_NFS4) {
 208                                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 209                                         warn("%s: acl_create_entry_np() failed", filename);
 210                                         acl_free(acl_new);
 211                                         return (-1);
 212                                 }
 213                                 /*
 214                                  * Without this increment, adding several
 215                                  * entries at once, for example
 216                                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 217                                  * would make them appear in reverse order.
 218                                  */
 219                                 entry_number++;
 220                         } else {
 221                                 if (acl_create_entry(&acl_new, &entry_new) == -1) {
 222                                         warn("%s: acl_create_entry() failed", filename);
 223                                         acl_free(acl_new);
 224                                         return (-1);
 225                                 }
 226                         }
 227                         if (acl_copy_entry(entry_new, entry) == -1)
 228                                 err(1, "%s: acl_copy_entry() failed", filename);
 229                 }
 230         }
 231
 232         acl_free(*prev_acl);
 233         *prev_acl = acl_new;
 234
 235         return (0);
 236 }
 237
 238 int
 239 add_acl(acl_t acl, uint entry_number, acl_t *prev_acl, const char *filename)
 240 {
 241         acl_entry_t entry, entry_new;
 242         acl_t acl_new;
 243         int entry_id, acl_brand, prev_acl_brand;
 244
 245         acl_get_brand_np(acl, &acl_brand);
 246         acl_get_brand_np(*prev_acl, &prev_acl_brand);
 247
 248         if (prev_acl_brand != ACL_BRAND_NFS4) {
 249                 warnx("%s: the '-a' option is only applicable to NFSv4 ACLs",
 250                     filename);
 251                 return (-1);
 252         }
 253
 254         if (branding_mismatch(acl_brand, ACL_BRAND_NFS4)) {
 255                 warnx("%s: branding mismatch; existing ACL is NFSv4, "
 256                     "entry to be added is %s", filename,
 257                     brand_name(acl_brand));
 258                 return (-1);
 259         }
 260
 261         acl_new = acl_dup(*prev_acl);
 262         if (acl_new == NULL)
 263                 err(1, "%s: acl_dup() failed", filename);
 264
 265         entry_id = ACL_FIRST_ENTRY;
 266
 267         while (acl_get_entry(acl, entry_id, &entry) == 1) {
 268                 entry_id = ACL_NEXT_ENTRY;
 269
 270                 if (acl_create_entry_np(&acl_new, &entry_new, entry_number) == -1) {
 271                         warn("%s: acl_create_entry_np() failed", filename);
 272                         acl_free(acl_new);
 273                         return (-1);
 274                 }
 275
 276                 /*
 277                  * Without this increment, adding several
 278                  * entries at once, for example
 279                  * "setfacl -m user:1:r:allow,user:2:r:allow",
 280                  * would make them appear in reverse order.
 281                  */
 282                 entry_number++;
 283
 284                 if (acl_copy_entry(entry_new, entry) == -1)
 285                         err(1, "%s: acl_copy_entry() failed", filename);
 286         }
 287
 288         acl_free(*prev_acl);
 289         *prev_acl = acl_new;
 290
 291         return (0);
 292 }