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From 358b40e72a8b5ea02fec84483ec76ee727315fca Mon Sep 17 00:00:00 2001
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From: Michal Domonkos <mdomonko@redhat.com>
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Date: Thu, 3 Jan 2019 15:58:06 +0100
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Subject: [PATCH 1/2] reposync: fix-up path traversal prevention
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Previously, pkg_download_path() would still pass if the target path was
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a "sibling" of the destination directory.
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Example:
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repo_target = '/tmp/myrepo'
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pkg_download_path = '../myrepo2/evil_file'
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...
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# final path that passes the check:
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pkg_download_path = '/tmp/myrepo2/evil_file'
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# ^ this is a superstring of repo_target!
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This commit prevents that by making sure repo_target ends with a path
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separator before it is passed to startswith(). We achieve that by
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simply using join() with an empty string (see python docs).
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In addition, normpath() is replaced by realpath() to account for
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symlinks that could also carry us outside repo_target.
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Resolves RHEL-8 bug:
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https://bugzilla.redhat.com/show_bug.cgi?id=1600722
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---
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plugins/reposync.py | 9 ++++++---
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1 file changed, 6 insertions(+), 3 deletions(-)
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diff --git a/plugins/reposync.py b/plugins/reposync.py
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index 29b911ed..0d72f559 100644
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--- a/plugins/reposync.py
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+++ b/plugins/reposync.py
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@@ -32,7 +32,7 @@
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def _pkgdir(intermediate, target):
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cwd = dnf.i18n.ucd(os.getcwd())
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- return os.path.normpath(os.path.join(cwd, intermediate, target))
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+ return os.path.realpath(os.path.join(cwd, intermediate, target))
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class RPMPayloadLocation(dnf.repo.RPMPayload):
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@@ -118,9 +118,12 @@ def metadata_target(self, repo):
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def pkg_download_path(self, pkg):
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repo_target = self.repo_target(pkg.repo)
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- pkg_download_path = os.path.normpath(
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+ pkg_download_path = os.path.realpath(
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os.path.join(repo_target, pkg.location))
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- if not pkg_download_path.startswith(repo_target):
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+ # join() ensures repo_target ends with a path separator (otherwise the
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+ # check would pass if pkg_download_path was a "sibling" path component
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+ # of repo_target that has the same prefix).
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+ if not pkg_download_path.startswith(os.path.join(repo_target, '')):
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raise dnf.exceptions.Error(
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_("Download target '{}' is outside of download path '{}'.").format(
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pkg_download_path, repo_target))
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From 6e3cf05fc9a4e7559efcf37bebe5ff2998fc11b3 Mon Sep 17 00:00:00 2001
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From: Michal Domonkos <mdomonko@redhat.com>
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Date: Thu, 3 Jan 2019 16:08:37 +0100
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Subject: [PATCH 2/2] reposync: cosmetic: PEP8 whitespace fixes
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---
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plugins/reposync.py | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/plugins/reposync.py b/plugins/reposync.py
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index 0d72f559..503e19a3 100644
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--- a/plugins/reposync.py
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+++ b/plugins/reposync.py
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@@ -46,6 +46,7 @@ def _target_params(self):
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tp['dest'] = self.package_dir
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return tp
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+
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@dnf.plugin.register_command
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class RepoSyncCommand(dnf.cli.Command):
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aliases = ('reposync',)
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@@ -190,4 +191,3 @@ def download_packages(self, repo):
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shutil.copy(pkg_path, target_dir)
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if self.opts.delete:
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self.delete_old_local_packages(pkglist)
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-
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