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pull: Error if gpg=true and summary is 404, add more tests 

I did a quick audit pass through the pull code.  What I focused on the
most is the case where `gpg-verify-summary=true`, and in particular
where `gpg-verify=false` too.  This should be a valid and secure
configuration.

The primary change here is to error out very quickly if either
`summary` or `summary.sig` are 404.  Previously, we'd only error out
if we were processing deltas.

Expand the existing test case to cover this, plus invalid summary and
invalid sig.  (The test case was failing with current git master too).
This commit is contained in:
Colin Walters 2015-06-27 12:00:49 -04:00
parent 3737b9851a
commit 720e3b5f83
2 changed files with 63 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
src/libostree/ostree-repo-pull.c
View File

@ -1318,7 +1318,10 @@ request_static_delta_superblock_sync (OtPullData *pull_data,
delta = g_strconcat (from_revision ? from_revision : "", from_revision ? "-" : "", to_revision, NULL);
summary_csum = g_hash_table_lookup (pull_data->summary_deltas_checksums, delta);
/* At this point we've GPG verified the data, so in theory
* could trust that they provided the right data, but let's
* make this a hard error.
*/
if (pull_data->gpg_verify_summary && !summary_csum)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
@ -1818,28 +1821,42 @@ ostree_repo_pull_with_options (OstreeRepo *self,
soup_uri_free (uri);
}
if (!bytes_summary && pull_data->gpg_verify_summary)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"GPG verification enabled, but no summary found (use gpg-verify-summary=false in remote config to disable)");
goto out;
}
if (bytes_summary)
{
g_autoptr(GVariant) sig_variant = NULL;
glnx_unref_object OstreeGpgVerifyResult *result = NULL;
pull_data->summary_data = g_bytes_ref (bytes_summary);
pull_data->summary = g_variant_new_from_bytes (OSTREE_SUMMARY_GVARIANT_FORMAT, bytes_summary, FALSE);
uri = suburi_new (pull_data->base_uri, "summary.sig", NULL);
if (!fetch_uri_contents_membuf_sync (pull_data, uri, FALSE, TRUE,
&bytes_sig, cancellable, error))
goto out;
soup_uri_free (uri);
}
if (bytes_sig)
pull_data->summary_data_sig = g_bytes_ref (bytes_sig);
else
if (!bytes_sig && pull_data->gpg_verify_summary)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"GPG verification enabled, but no summary signatures found (use gpg-verify-summary=false in remote config to disable)");
"GPG verification enabled, but no summary.sig found (use gpg-verify-summary=false in remote config to disable)");
goto out;
}
if (bytes_summary)
{
pull_data->summary_data = g_bytes_ref (bytes_summary);
pull_data->summary = g_variant_new_from_bytes (OSTREE_SUMMARY_GVARIANT_FORMAT, bytes_summary, FALSE);
}
if (bytes_summary && bytes_sig)
{
g_autoptr(GVariant) sig_variant = NULL;
glnx_unref_object OstreeGpgVerifyResult *result = NULL;
pull_data->summary_data_sig = g_bytes_ref (bytes_sig);
sig_variant = g_variant_new_from_bytes (OSTREE_SUMMARY_SIG_GVARIANT_FORMAT, bytes_sig, FALSE);
result = _ostree_repo_gpg_verify_with_metadata (self,
bytes_summary,

34
tests/test-pull-summary-sigs.sh
View File

@ -60,22 +60,46 @@ cd $prev_dir
${OSTREE} --repo=${test_tmpdir}/ostree-srv/gnomerepo summary -u ${COMMIT_SIGN}
repo_reinit () {
cd ${test_tmpdir}
rm -rf repo
mkdir repo
${OSTREE} --repo=repo init --mode=archive-z2
${OSTREE} --repo=repo remote add origin $(cat httpd-address)/ostree/gnomerepo
${OSTREE} --repo=repo remote add --set=gpg-verify-summary=true origin $(cat httpd-address)/ostree/gnomerepo
}
cd ${test_tmpdir}
repo_reinit
${OSTREE} --repo=repo pull origin main
echo "ok pull with signed summary"
cd ${test_tmpdir}
repo_reinit
mv ${test_tmpdir}/ostree-srv/gnomerepo/summary.sig{,.good}
echo invalid > ${test_tmpdir}/ostree-srv/gnomerepo/summary.sig
if ${OSTREE} --repo=repo pull origin main 2>err.txt; then
assert_not_reached "Successful pull with invalid GPG sig"
fi
assert_file_has_content err.txt "no signatures found"
mv ${test_tmpdir}/ostree-srv/gnomerepo/summary.sig{.good,}
echo "ok pull with invalid summary gpg signature fails"
cd ${test_tmpdir}
repo_reinit
cp ${test_tmpdir}/ostree-srv/gnomerepo/summary{,.good}
# Some leading garbage
(echo invalid && cat ${test_tmpdir}/ostree-srv/gnomerepo/summary) > summary.bad.tmp && mv summary.bad.tmp ${test_tmpdir}/ostree-srv/gnomerepo/summary
if ${OSTREE} --repo=repo pull origin main; then
assert_not_reached "Successful pull with invalid summary"
fi
mv ${test_tmpdir}/ostree-srv/gnomerepo/summary{.good,}
echo "ok pull with invalid summary (leading garbage) fails"
# Generate a delta
${OSTREE} --repo=${test_tmpdir}/ostree-srv/gnomerepo static-delta generate --empty main
${OSTREE} --repo=${test_tmpdir}/ostree-srv/gnomerepo summary -u ${COMMIT_SIGN}
cd ${test_tmpdir}
rm -rf repo
mkdir repo
${OSTREE} --repo=repo init --mode=archive-z2
${OSTREE} --repo=repo remote add origin $(cat httpd-address)/ostree/gnomerepo
repo_reinit
${OSTREE} --repo=repo pull origin main
echo "ok pull delta with signed summary"