The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_acl.c

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    1 /*-
    2  * Copyright (c) 2017, Fedor Uporov
    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 REGENTS 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 REGENTS 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: stable/11/sys/fs/ext2fs/ext2_acl.c 322711 2017-08-20 01:08:23Z pfg $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/types.h>
   32 #include <sys/stat.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/vnode.h>
   36 #include <sys/bio.h>
   37 #include <sys/buf.h>
   38 #include <sys/endian.h>
   39 #include <sys/conf.h>
   40 #include <sys/mount.h>
   41 #include <sys/extattr.h>
   42 
   43 #include <fs/ext2fs/fs.h>
   44 #include <fs/ext2fs/ext2fs.h>
   45 #include <fs/ext2fs/inode.h>
   46 #include <fs/ext2fs/ext2_acl.h>
   47 #include <fs/ext2fs/ext2_extattr.h>
   48 #include <fs/ext2fs/ext2_extern.h>
   49 #include <fs/ext2fs/ext2_dinode.h>
   50 #include <fs/ext2fs/ext2_mount.h>
   51 
   52 #ifdef UFS_ACL
   53 
   54 void
   55 ext2_sync_acl_from_inode(struct inode *ip, struct acl *acl)
   56 {
   57         struct acl_entry        *acl_mask, *acl_group_obj;
   58         int     i;
   59 
   60         /*
   61          * Update ACL_USER_OBJ, ACL_OTHER, but simply identify ACL_MASK
   62          * and ACL_GROUP_OBJ for use after we know whether ACL_MASK is
   63          * present.
   64          */
   65         acl_mask = NULL;
   66         acl_group_obj = NULL;
   67         for (i = 0; i < acl->acl_cnt; i++) {
   68                 switch (acl->acl_entry[i].ae_tag) {
   69                 case ACL_USER_OBJ:
   70                         acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
   71                             ACL_USER_OBJ, ip->i_mode);
   72                         acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
   73                         break;
   74 
   75                 case ACL_GROUP_OBJ:
   76                         acl_group_obj = &acl->acl_entry[i];
   77                         acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
   78                         break;
   79 
   80                 case ACL_OTHER:
   81                         acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
   82                             ACL_OTHER, ip->i_mode);
   83                         acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
   84                         break;
   85 
   86                 case ACL_MASK:
   87                         acl_mask = &acl->acl_entry[i];
   88                         acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
   89                         break;
   90 
   91                 case ACL_USER:
   92                 case ACL_GROUP:
   93                         break;
   94 
   95                 default:
   96                         panic("ext2_sync_acl_from_inode(): bad ae_tag");
   97                 }
   98         }
   99 
  100         if (acl_group_obj == NULL)
  101                 panic("ext2_sync_acl_from_inode(): no ACL_GROUP_OBJ");
  102 
  103         if (acl_mask == NULL) {
  104                 /*
  105                  * There is no ACL_MASK, so update ACL_GROUP_OBJ.
  106                  */
  107                 acl_group_obj->ae_perm = acl_posix1e_mode_to_perm(
  108                     ACL_GROUP_OBJ, ip->i_mode);
  109         } else {
  110                 /*
  111                  * Update the ACL_MASK entry instead of ACL_GROUP_OBJ.
  112                  */
  113                 acl_mask->ae_perm = acl_posix1e_mode_to_perm(ACL_GROUP_OBJ,
  114                     ip->i_mode);
  115         }
  116 }
  117 
  118 static void
  119 ext2_sync_inode_from_acl(struct acl *acl, struct inode *ip)
  120 {
  121 
  122         ip->i_mode &= ACL_PRESERVE_MASK;
  123         ip->i_mode |= acl_posix1e_acl_to_mode(acl);
  124 }
  125 
  126 /*
  127  * Convert from filesystem to in-memory representation.
  128  */
  129 static int
  130 ext4_acl_from_disk(char *value, size_t size, struct acl *acl)
  131 {
  132         const char *end;
  133         int n, count, s;
  134 
  135         if (value == NULL)
  136                 return (EINVAL);
  137 
  138         end = value + size;
  139 
  140         if (((struct ext2_acl_header *)value)->a_version != EXT4_ACL_VERSION)
  141                 return (EINVAL);
  142 
  143         if (size < sizeof(struct ext2_acl_header))
  144                 return (EINVAL);
  145 
  146         s = size - sizeof(struct ext2_acl_header);
  147         s -= 4 * sizeof(struct ext2_acl_entry_short);
  148         if (s < 0)
  149                 if ((size - sizeof(struct ext2_acl_header)) %
  150                     sizeof(struct ext2_acl_entry_short))
  151                         count = -1;
  152                 else
  153                         count = (size - sizeof(struct ext2_acl_header)) /
  154                             sizeof(struct ext2_acl_entry_short);
  155         else
  156                 if (s % sizeof(struct ext2_acl_entry))
  157                         count = -1;
  158                 else
  159                         count = s / sizeof(struct ext2_acl_entry) + 4;
  160 
  161         if (count <= 0 || count > acl->acl_maxcnt)
  162                 return (EINVAL);
  163 
  164         value = value + sizeof(struct ext2_acl_header);
  165 
  166         for (n = 0; n < count; n++) {
  167                 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)value;
  168                 if ((char *)value + sizeof(struct ext2_acl_entry_short) > end)
  169                         return (EINVAL);
  170 
  171                 acl->acl_entry[n].ae_tag  = entry->ae_tag;
  172                 acl->acl_entry[n].ae_perm = entry->ae_perm;
  173 
  174                 switch (acl->acl_entry[n].ae_tag) {
  175                 case ACL_USER_OBJ:
  176                 case ACL_GROUP_OBJ:
  177                 case ACL_MASK:
  178                 case ACL_OTHER:
  179                         value = (char *)value + sizeof(struct ext2_acl_entry_short);
  180                         break;
  181 
  182                 case ACL_USER:
  183                         value = (char *)value + sizeof(struct ext2_acl_entry);
  184                         if ((char *)value > end)
  185                                 return (EINVAL);
  186 
  187                         acl->acl_entry[n].ae_id = entry->ae_id;
  188                         break;
  189 
  190                 case ACL_GROUP:
  191                         value = (char *)value + sizeof(struct ext2_acl_entry);
  192                         if ((char *)value > end)
  193                                 return (EINVAL);
  194 
  195                         acl->acl_entry[n].ae_id = entry->ae_id;
  196                         break;
  197 
  198                 default:
  199                         return (EINVAL);
  200                 }
  201         }
  202 
  203         if (value != end)
  204                 return (EINVAL);
  205 
  206         acl->acl_cnt = count;
  207 
  208         return (0);
  209 }
  210 
  211 static int
  212 ext2_getacl_posix1e(struct vop_getacl_args *ap)
  213 {
  214         int attrnamespace;
  215         const char *attrname;
  216         char *value;
  217         int len;
  218         int error;
  219 
  220         switch (ap->a_type) {
  221         case ACL_TYPE_DEFAULT:
  222                 attrnamespace = POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE;
  223                 attrname = POSIX1E_ACL_DEFAULT_EXTATTR_NAME;
  224                 break;
  225         case ACL_TYPE_ACCESS:
  226                 attrnamespace = POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE;
  227                 attrname = POSIX1E_ACL_ACCESS_EXTATTR_NAME;
  228                 break;
  229         default:
  230                 return (EINVAL);
  231         }
  232 
  233         len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
  234         value = malloc(len, M_ACL, M_WAITOK);
  235         if (!value)
  236                 return (ENOMEM);
  237 
  238         error = vn_extattr_get(ap->a_vp, IO_NODELOCKED, attrnamespace, attrname,
  239             &len, value, ap->a_td);
  240         if (error == ENOATTR) {
  241                 switch (ap->a_type) {
  242                 case ACL_TYPE_ACCESS:
  243                         ap->a_aclp->acl_cnt = 3;
  244                         ap->a_aclp->acl_entry[0].ae_tag = ACL_USER_OBJ;
  245                         ap->a_aclp->acl_entry[0].ae_id = ACL_UNDEFINED_ID;
  246                         ap->a_aclp->acl_entry[0].ae_perm = ACL_PERM_NONE;
  247                         ap->a_aclp->acl_entry[1].ae_tag = ACL_GROUP_OBJ;
  248                         ap->a_aclp->acl_entry[1].ae_id = ACL_UNDEFINED_ID;
  249                         ap->a_aclp->acl_entry[1].ae_perm = ACL_PERM_NONE;
  250                         ap->a_aclp->acl_entry[2].ae_tag = ACL_OTHER;
  251                         ap->a_aclp->acl_entry[2].ae_id = ACL_UNDEFINED_ID;
  252                         ap->a_aclp->acl_entry[2].ae_perm = ACL_PERM_NONE;
  253                         break;
  254 
  255                 case ACL_TYPE_DEFAULT:
  256                         ap->a_aclp->acl_cnt = 0;
  257                         break;
  258                 }
  259         } else if (error != 0)
  260                 goto out;
  261 
  262         if (!error) {
  263                 error = ext4_acl_from_disk(value, len, ap->a_aclp);
  264                 if (error)
  265                         goto out;
  266         }
  267 
  268         if (error == ENOATTR)
  269                 error = 0;
  270 
  271         if (ap->a_type == ACL_TYPE_ACCESS)
  272                 ext2_sync_acl_from_inode(VTOI(ap->a_vp), ap->a_aclp);
  273 
  274 out:
  275         free(value, M_TEMP);
  276         return (error);
  277 }
  278 
  279 int
  280 ext2_getacl(struct vop_getacl_args *ap)
  281 {
  282 
  283         if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
  284             ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
  285                 return (EOPNOTSUPP);
  286 
  287         if (ap->a_type == ACL_TYPE_NFS4)
  288                 return (ENOTSUP);
  289 
  290         return (ext2_getacl_posix1e(ap));
  291 }
  292 
  293 /*
  294  * Convert from in-memory to filesystem representation.
  295  */
  296 static int
  297 ext4_acl_to_disk(const struct acl *acl, size_t *size, char *value)
  298 {
  299         struct ext2_acl_header *ext_acl;
  300         int disk_size;
  301         char *e;
  302         size_t n;
  303 
  304         if (acl->acl_cnt <= 4)
  305                 disk_size = sizeof(struct ext2_acl_header) +
  306                    acl->acl_cnt * sizeof(struct ext2_acl_entry_short);
  307         else
  308                 disk_size = sizeof(struct ext2_acl_header) +
  309                     4 * sizeof(struct ext2_acl_entry_short) +
  310                     (acl->acl_cnt - 4) * sizeof(struct ext2_acl_entry);
  311 
  312         if (disk_size > *size)
  313                 return (EINVAL);
  314 
  315         *size = disk_size;
  316         ext_acl = (struct ext2_acl_header *)value;
  317 
  318         ext_acl->a_version = EXT4_ACL_VERSION;
  319         e = (char *)ext_acl + sizeof(struct ext2_acl_header);
  320         for (n = 0; n < acl->acl_cnt; n++) {
  321                 const struct acl_entry *acl_e = &acl->acl_entry[n];
  322                 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)e;
  323                 entry->ae_tag  = acl_e->ae_tag;
  324                 entry->ae_perm = acl_e->ae_perm;
  325                 switch (acl_e->ae_tag) {
  326                 case ACL_USER:
  327                         entry->ae_id = acl_e->ae_id;
  328                         e += sizeof(struct ext2_acl_entry);
  329                         break;
  330 
  331                 case ACL_GROUP:
  332                         entry->ae_id = acl_e->ae_id;
  333                         e += sizeof(struct ext2_acl_entry);
  334                         break;
  335 
  336                 case ACL_USER_OBJ:
  337                 case ACL_GROUP_OBJ:
  338                 case ACL_MASK:
  339                 case ACL_OTHER:
  340                         e += sizeof(struct ext2_acl_entry_short);
  341                         break;
  342 
  343                 default:
  344                         return (EINVAL);
  345                 }
  346         }
  347 
  348         return (0);
  349 }
  350 
  351 static int
  352 ext2_setacl_posix1e(struct vop_setacl_args *ap)
  353 {
  354         struct inode *ip = VTOI(ap->a_vp);
  355         char *value;
  356         size_t len;
  357         int error;
  358 
  359         if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
  360                 return (EINVAL);
  361 
  362         /*
  363          * If this is a set operation rather than a delete operation,
  364          * invoke VOP_ACLCHECK() on the passed ACL to determine if it is
  365          * valid for the target.  This will include a check on ap->a_type.
  366          */
  367         if (ap->a_aclp != NULL) {
  368                 /*
  369                  * Set operation.
  370                  */
  371                 error = VOP_ACLCHECK(ap->a_vp, ap->a_type, ap->a_aclp,
  372                     ap->a_cred, ap->a_td);
  373                 if (error)
  374                         return (error);
  375         } else {
  376                 /*
  377                  * Delete operation.
  378                  * POSIX.1e allows only deletion of the default ACL on a
  379                  * directory (ACL_TYPE_DEFAULT).
  380                  */
  381                 if (ap->a_type != ACL_TYPE_DEFAULT)
  382                         return (EINVAL);
  383                 if (ap->a_vp->v_type != VDIR)
  384                         return (ENOTDIR);
  385         }
  386 
  387         if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
  388                 return (EROFS);
  389 
  390         /*
  391          * Authorize the ACL operation.
  392          */
  393         if (ip->i_flags & (IMMUTABLE | APPEND))
  394                 return (EPERM);
  395 
  396         /*
  397          * Must hold VADMIN (be file owner) or have appropriate privilege.
  398          */
  399         if ((error = VOP_ACCESS(ap->a_vp, VADMIN, ap->a_cred, ap->a_td)))
  400                 return (error);
  401 
  402         switch (ap->a_type) {
  403         case ACL_TYPE_ACCESS:
  404                 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
  405                 value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
  406                 error = ext4_acl_to_disk(ap->a_aclp, &len, value);
  407                 if (error == 0)
  408                         error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
  409                             POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE,
  410                             POSIX1E_ACL_ACCESS_EXTATTR_NAME, len,
  411                             value, ap->a_td);
  412 
  413                 free(value, M_ACL);
  414                 break;
  415 
  416         case ACL_TYPE_DEFAULT:
  417                 if (ap->a_aclp == NULL) {
  418                         error = vn_extattr_rm(ap->a_vp, IO_NODELOCKED,
  419                             POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
  420                             POSIX1E_ACL_DEFAULT_EXTATTR_NAME, ap->a_td);
  421 
  422                         /*
  423                          * Attempting to delete a non-present default ACL
  424                          * will return success for portability purposes.
  425                          * (TRIX)
  426                          *
  427                          * XXX: Note that since we can't distinguish
  428                          * "that EA is not supported" from "that EA is not
  429                          * defined", the success case here overlaps the
  430                          * the ENOATTR->EOPNOTSUPP case below.
  431                          */
  432                         if (error == ENOATTR)
  433                                 error = 0;
  434                 } else {
  435                         len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
  436                         value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
  437                         error = ext4_acl_to_disk(ap->a_aclp, &len, value);
  438                         if (error == 0)
  439                                 error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
  440                                     POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
  441                                     POSIX1E_ACL_DEFAULT_EXTATTR_NAME, len,
  442                                     value, ap->a_td);
  443 
  444                         free(value, M_ACL);
  445                 }
  446                 break;
  447 
  448         default:
  449                 error = EINVAL;
  450         }
  451 
  452         /*
  453          * Map lack of attribute definition in UFS_EXTATTR into lack of
  454          * support for ACLs on the filesystem.
  455          */
  456         if (error == ENOATTR)
  457                 return (EOPNOTSUPP);
  458 
  459         if (error != 0)
  460                 return (error);
  461 
  462         if (ap->a_type == ACL_TYPE_ACCESS) {
  463                 /*
  464                  * Now that the EA is successfully updated, update the
  465                  * inode and mark it as changed.
  466                  */
  467                 ext2_sync_inode_from_acl(ap->a_aclp, ip);
  468                 ip->i_flag |= IN_CHANGE;
  469                 error = ext2_update(ip->i_vnode, 1);
  470         }
  471 
  472         VN_KNOTE_UNLOCKED(ap->a_vp, NOTE_ATTRIB);
  473 
  474         return (error);
  475 }
  476 
  477 int
  478 ext2_setacl(struct vop_setacl_args *ap)
  479 {
  480         if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
  481             ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
  482                 return (EOPNOTSUPP);
  483 
  484         if (ap->a_type == ACL_TYPE_NFS4)
  485                 return (ENOTSUP);
  486 
  487         return (ext2_setacl_posix1e(ap));
  488 }
  489 
  490 /*
  491  * Check the validity of an ACL for a file.
  492  */
  493 int
  494 ext2_aclcheck(struct vop_aclcheck_args *ap)
  495 {
  496 
  497         if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
  498             ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
  499                 return (EOPNOTSUPP);
  500 
  501         if (ap->a_type == ACL_TYPE_NFS4)
  502                 return (ENOTSUP);
  503 
  504         if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
  505                 return (EINVAL);
  506 
  507         /*
  508          * Verify we understand this type of ACL, and that it applies
  509          * to this kind of object.
  510          * Rely on the acl_posix1e_check() routine to verify the contents.
  511          */
  512         switch (ap->a_type) {
  513                 case ACL_TYPE_ACCESS:
  514                 break;
  515 
  516                 case ACL_TYPE_DEFAULT:
  517                         if (ap->a_vp->v_type != VDIR)
  518                                 return (EINVAL);
  519                 break;
  520 
  521                 default:
  522                         return (EINVAL);
  523         }
  524 
  525         return (acl_posix1e_check(ap->a_aclp));
  526 }
  527 
  528 #endif /* UFS_ACL */

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