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Message-ID: <20150928160855.GD1358@fieldses.org> Date: Mon, 28 Sep 2015 12:08:55 -0400 From: "J. Bruce Fields" <bfields@...ldses.org> To: Andreas Gruenbacher <agruenba@...hat.com> Cc: Alexander Viro <viro@...iv.linux.org.uk>, Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Jeff Layton <jlayton@...chiereds.net>, Trond Myklebust <trond.myklebust@...marydata.com>, Anna Schumaker <anna.schumaker@...app.com>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org, linux-api@...r.kernel.org Subject: Re: [PATCH v8 10/41] richacl: Permission check algorithm On Mon, Sep 28, 2015 at 12:09:01AM +0200, Andreas Gruenbacher wrote: > A richacl roughly grants a requested access if the NFSv4 acl in the > richacl grants the requested permissions according to the NFSv4 > permission check algorithm and the file mask that applies to the process > includes the requested permissions. > > Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com> > Reviewed-by: "J. Bruce Fields" <bfields@...ldses.org> > --- > fs/Makefile | 2 +- > fs/richacl_inode.c | 148 ++++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/richacl.h | 3 + > 3 files changed, 152 insertions(+), 1 deletion(-) > create mode 100644 fs/richacl_inode.c > > diff --git a/fs/Makefile b/fs/Makefile > index fe3e9dd..ec665fd 100644 > --- a/fs/Makefile > +++ b/fs/Makefile > @@ -49,7 +49,7 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o > > obj-$(CONFIG_FHANDLE) += fhandle.o > obj-$(CONFIG_FS_RICHACL) += richacl.o > -richacl-y := richacl_base.o > +richacl-y := richacl_base.o richacl_inode.o > > obj-y += quota/ > > diff --git a/fs/richacl_inode.c b/fs/richacl_inode.c > new file mode 100644 > index 0000000..54e899d > --- /dev/null > +++ b/fs/richacl_inode.c > @@ -0,0 +1,148 @@ > +/* > + * Copyright (C) 2010 Novell, Inc. > + * Copyright (C) 2015 Red Hat, Inc. > + * Written by Andreas Gruenbacher <agruen@...nel.org> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2, or (at your option) any > + * later version. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + */ > + > +#include <linux/sched.h> > +#include <linux/module.h> > +#include <linux/fs.h> > +#include <linux/slab.h> > +#include <linux/richacl.h> > + > +/** > + * richacl_permission - richacl permission check algorithm > + * @inode: inode to check > + * @acl: rich acl of the inode > + * @want: requested access (MAY_* flags) > + * > + * Checks if the current process is granted @mask flags in @acl. > + */ > +int > +richacl_permission(struct inode *inode, const struct richacl *acl, > + int want) > +{ > + const struct richace *ace; > + unsigned int mask = richacl_want_to_mask(want); > + unsigned int requested = mask, denied = 0; > + int in_owning_group = in_group_p(inode->i_gid); > + int in_owner_or_group_class = in_owning_group; > + > + /* > + * A process is > + * - in the owner file class if it owns the file, > + * - in the group file class if it is in the file's owning group or > + * it matches any of the user or group entries, and > + * - in the other file class otherwise. > + * The file class is only relevant for determining which file mask to > + * apply, which only happens for masked acls. > + */ > + if (acl->a_flags & RICHACL_MASKED) { > + if ((acl->a_flags & RICHACL_WRITE_THROUGH) && > + uid_eq(current_fsuid(), inode->i_uid)) { > + denied = requested & ~acl->a_owner_mask; > + goto out; > + } > + } else { > + /* > + * When the acl is not masked, there is no need to determine if > + * the process is in the group class and we can break out > + * earlier of the loop below. > + */ > + in_owner_or_group_class = 1; > + } > + > + /* > + * 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. But that's OK, since a non-owner matching a unix group will be placed into the group class, so the RICHACL_MASKED clause after the loop below will apply the group mask. That logic is a little subtle, but OK. --b. > This ensures > + * that we grant the same permissions as the acl computed by > + * richacl_apply_masks(). > + * > + * Without this restriction, the following richacl would grant > + * rw access to processes which are both the owner and in the > + * owning group, but not to other users in the owning group, > + * which could not be represented without masks: > + * > + * owner:rw::mask > + * group@:rw::allow > + */ > + if ((acl->a_flags & RICHACL_MASKED) && richace_is_allow(ace)) > + ace_mask &= acl->a_group_mask; > + > +entry_matches_owner: > + /* The process is in the owner or group file class. */ > + in_owner_or_group_class = 1; > + > +entry_matches_everyone: > + /* Check which mask flags the ACE allows or denies. */ > + if (richace_is_deny(ace)) > + denied |= ace_mask & mask; > + mask &= ~ace_mask; > + > + /* > + * Keep going until we know which file class > + * the process is in. > + */ > + if (!mask && in_owner_or_group_class) > + break; > + } > + denied |= mask; > + > + if (acl->a_flags & RICHACL_MASKED) { > + /* > + * The file class a process is in determines which file mask > + * applies. Check if that file mask also grants the requested > + * access. > + */ > + if (uid_eq(current_fsuid(), inode->i_uid)) > + denied |= requested & ~acl->a_owner_mask; > + else if (in_owner_or_group_class) > + denied |= requested & ~acl->a_group_mask; > + else { > + if (acl->a_flags & RICHACL_WRITE_THROUGH) > + denied = requested & ~acl->a_other_mask; > + else > + denied |= requested & ~acl->a_other_mask; > + } > + } > + > +out: > + return denied ? -EACCES : 0; > +} > +EXPORT_SYMBOL_GPL(richacl_permission); > diff --git a/include/linux/richacl.h b/include/linux/richacl.h > index e00f313..9768eeb 100644 > --- a/include/linux/richacl.h > +++ b/include/linux/richacl.h > @@ -300,4 +300,7 @@ extern unsigned int richacl_want_to_mask(unsigned int); > extern void richacl_compute_max_masks(struct richacl *); > extern struct richacl *richacl_chmod(struct richacl *, mode_t); > > +/* richacl_inode.c */ > +extern int richacl_permission(struct inode *, const struct richacl *, int); > + > #endif /* __RICHACL_H */ > -- > 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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