Re: [PATCH v8 10/41] richacl: Permission check algorithm

From	Andreas Grünbacher <andreas.gruenbacher@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v8 10/41] richacl: Permission check algorithm
Date	2015-09-28 18:30 +0200
Message-ID	<qdJtp-4HM-17@gated-at.bofh.it> (permalink)
References	<qdsiR-3hB-5@gated-at.bofh.it> <qdsLU-3PM-5@gated-at.bofh.it> <qdJa2-4l8-33@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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2015-09-28 18:08 GMT+02:00 J. Bruce Fields <bfields@fieldses.org>:
> On Mon, Sep 28, 2015 at 12:09:01AM +0200, Andreas Gruenbacher wrote:
>> +     /*
>> +      * Check if the acl grants the requested access and determine which
>> +      * file class the process is in.
>> +      */
>> +     richacl_for_each_entry(ace, acl) {
>> +             unsigned int ace_mask = ace->e_mask;
>> +
>> +             if (richace_is_inherit_only(ace))
>> +                     continue;
>> +             if (richace_is_owner(ace)) {
>> +                     if (!uid_eq(current_fsuid(), inode->i_uid))
>> +                             continue;
>> +                     goto entry_matches_owner;
>> +             } else if (richace_is_group(ace)) {
>> +                     if (!in_owning_group)
>> +                             continue;
>> +             } else if (richace_is_unix_user(ace)) {
>> +                     if (!uid_eq(current_fsuid(), ace->e_id.uid))
>> +                             continue;
>> +                     goto entry_matches_owner;
>> +             } else if (richace_is_unix_group(ace)) {
>> +                     if (!in_group_p(ace->e_id.gid))
>> +                             continue;
>> +             } else
>> +                     goto entry_matches_everyone;
>> +
>> +             /*
>> +              * Apply the group file mask to entries other than owner@ and
>> +              * everyone@ or user entries matching the owner.
>
> The above also skips the following group_mask application on any unix
> group.

Really? How does it do that?

Thanks,
Andreas
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Thread

[PATCH v8 00/41] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:10 +0200
  [PATCH v8 31/41] nfsd: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 15/41] richacl: Automatic Inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 03/41] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 12/41] vfs: Cache richacl in struct inode Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 14/41] richacl: Create-time inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 33/41] richacl: Add support for unmapped identifiers Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 06/41] richacl: In-memory representation and helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 09/41] richacl: Update the file masks in chmod() Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
    Re: [PATCH v8 09/41] richacl: Update the file masks in chmod() "J. Bruce Fields" <bfields@fieldses.org> - 2015-09-28 17:30 +0200
      Re: [PATCH v8 09/41] richacl: Update the file masks in chmod() Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-29 01:50 +0200
  [PATCH v8 13/41] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 27/41] richacl: Create richacl from mode values Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 19/41] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 21/41] richacl: Move everyone@ aces down the acl Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 20/41] richacl: acl editing helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 32/41] nfsd: Add support for the MAY_CREATE_{FILE,DIR} permissions Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 26/41] richacl: Apply the file masks to a richacl Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 01/41] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 41/41] richacl: uapi header split Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 18/41] ext4: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 17/41] vfs: Add richacl permission checking Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 35/41] sunrpc: Allow to demand-allocate pages to encode into Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 38/41] nfs: Remove unused xdr page offsets in getacl/setacl arguments Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 36/41] sunrpc: Add xdr_init_encode_pages Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 16/41] richacl: xattr mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 25/41] richacl: Isolate the owner and group classes Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 40/41] nfs: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 11/41] vfs: Cache base_acl objects in inodes Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 08/41] richacl: Compute maximum file masks from an acl Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 34/41] ext4: Don't allow unmapped identifiers in richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 05/41] vfs: Add permission flags for setting file attributes Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 28/41] nfsd: Keep list of acls to dispose of in compoundargs Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 04/41] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 22/41] richacl: Propagate everyone@ permissions to other aces Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 37/41] nfs: Fix GETATTR bitmap verification Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 29/41] nfsd: Use richacls as internal acl representation Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 39/41] nfs: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:20 +0200
  [PATCH v8 24/41] richacl: Set the other permissions to the other mask Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:30 +0200
  [PATCH v8 23/41] richacl: Set the owner permissions to the owner mask Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:30 +0200
  [PATCH v8 30/41] nfsd: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:30 +0200
  [PATCH v8 07/41] richacl: Permission mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:40 +0200
  [PATCH v8 10/41] richacl: Permission check algorithm Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:40 +0200
    Re: [PATCH v8 10/41] richacl: Permission check algorithm "J. Bruce Fields" <bfields@fieldses.org> - 2015-09-28 18:10 +0200
      Re: [PATCH v8 10/41] richacl: Permission check algorithm Andreas Grünbacher <andreas.gruenbacher@gmail.com> - 2015-09-28 18:30 +0200
        Re: [PATCH v8 10/41] richacl: Permission check algorithm "J. Bruce Fields" <bfields@fieldses.org> - 2015-09-28 18:30 +0200
          Re: [PATCH v8 10/41] richacl: Permission check algorithm Andreas Grünbacher <andreas.gruenbacher@gmail.com> - 2015-09-28 19:00 +0200
  [PATCH v8 02/41] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2015-09-28 00:50 +0200
  Re: [PATCH v8 00/41] Richacls "J. Bruce Fields" <bfields@fieldses.org> - 2015-09-28 18:40 +0200
    Re: [PATCH v8 00/41] Richacls Andreas Grünbacher <andreas.gruenbacher@gmail.com> - 2015-09-28 19:20 +0200
      Re: [PATCH v8 00/41] Richacls "J. Bruce Fields" <bfields@fieldses.org> - 2015-09-28 19:50 +0200
        Re: [PATCH v8 00/41] Richacls Andreas Grünbacher <andreas.gruenbacher@gmail.com> - 2015-09-29 17:00 +0200
  Re: [PATCH v8 00/41] Richacls Christoph Hellwig <hch@infradead.org> - 2015-10-04 08:30 +0200
    Re: [PATCH v8 00/41] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 20:50 +0200
      Re: [PATCH v8 00/41] Richacls Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-05 21:00 +0200
      Re: [PATCH v8 00/41] Richacls Dave Chinner <david@fromorbit.com> - 2015-10-05 23:20 +0200
        Re: [PATCH v8 00/41] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-06 00:10 +0200

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