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lib/checkout: Ignore world-writable dirs for bare-user-only checkout

Browse Source 
See https://github.com/ostreedev/ostree/pull/909 for more information on the
rationale. Basically there's no reason for flatpak (which uses `bare-user-only`)
to have world-writable dirs. Particularly with the presence of the system
helper.

An approach I considered instead was to parse and validate directory metadata
objects at commit time. We still may do that in addition; for file objects we *had*
to do it that way because the actual files would be laid down suid.  But directories
live only as inert `.dirmeta` objects until we do a checkout (i.e. `mkdir()`), so
we can solve the problem at checkout time.

Closes: #914
Approved by: alexlarsson
This commit is contained in:
Colin Walters 2017-06-07 14:21:59 -04:00 committed by Atomic Bot
parent 18ae8e5267
commit 8edb5161db
2 changed files with 25 additions and 3 deletions
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14
src/libostree/ostree-repo-checkout.c
View File

@ -749,8 +749,18 @@ checkout_tree_at_recurse (OstreeRepo *self,
*/
if (!did_exist)
{
if (TEMP_FAILURE_RETRY (fchmod (destination_dfd, mode)) < 0)
return glnx_throw_errno (error);
guint32 canonical_mode;
/* Silently ignore world-writable directories (plus sticky, suid bits,
* etc.) when doing a checkout for bare-user-only repos. This is related
* to the logic in ostree-repo-commit.c for files.
* See also: https://github.com/ostreedev/ostree/pull/909 i.e. 0c4b3a2b6da950fd78e63f9afec602f6188f1ab0
*/
if (self->mode == OSTREE_REPO_MODE_BARE_USER_ONLY)
canonical_mode = (mode & 0775) | S_IFDIR;
else
canonical_mode = mode;
if (TEMP_FAILURE_RETRY (fchmod (destination_dfd, canonical_mode)) < 0)
return glnx_throw_errno_prefix (error, "fchmod");
}
if (!did_exist && options->mode != OSTREE_REPO_CHECKOUT_MODE_USER)

14
tests/test-basic-user-only.sh
View File

@ -22,7 +22,7 @@ set -euo pipefail
. $(dirname $0)/libtest.sh
setup_test_repository "bare-user-only"
extra_basic_tests=2
extra_basic_tests=3
. $(dirname $0)/basic-test.sh
# Reset things so we don't inherit a lot of state from earlier tests
@ -59,3 +59,15 @@ $CMD_PREFIX ostree pull-local --repo=repo repo-input
$CMD_PREFIX ostree --repo=repo checkout -U -H content-with-group-writable groupwritable-co
assert_file_has_mode groupwritable-co/some-group-writable 664
echo "ok supported group writable"
cd ${test_tmpdir}
rm repo-input -rf
ostree_repo_init repo-input init --mode=archive
rm files -rf && mkdir files
mkdir files/worldwritable-dir
chmod a+w files/worldwritable-dir
$CMD_PREFIX ostree --repo=repo-input commit -b content-with-dir-world-writable --tree=dir=files
$CMD_PREFIX ostree pull-local --repo=repo repo-input
$CMD_PREFIX ostree --repo=repo checkout -U -H content-with-dir-world-writable dir-co
assert_file_has_mode dir-co/worldwritable-dir 775
echo "ok didn't make world-writable dir"