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From 699d3ee7b8968b5586ceb53e07d678e702735609 Mon Sep 17 00:00:00 2001
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From: Jaroslav Rohel <jrohel@redhat.com>
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Date: Wed, 12 Aug 2020 08:35:28 +0200
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Subject: [PATCH] Validate path read from repomd.xml
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---
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librepo/yum.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/librepo/yum.c b/librepo/yum.c
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index 3059188..529257b 100644
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--- a/librepo/yum.c
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+++ b/librepo/yum.c
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@@ -23,6 +23,7 @@
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#define BITS_IN_BYTE 8
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#include <stdio.h>
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+#include <libgen.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <errno.h>
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@@ -770,6 +771,22 @@ prepare_repo_download_targets(LrHandle *handle,
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continue;
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char *location_href = record->location_href;
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+
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+ char *dest_dir = realpath(handle->destdir, NULL);
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+ path = lr_pathconcat(handle->destdir, record->location_href, NULL);
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+ char *requested_dir = realpath(dirname(path), NULL);
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+ lr_free(path);
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+ if (!g_str_has_prefix(requested_dir, dest_dir)) {
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+ g_debug("%s: Invalid path: %s", __func__, location_href);
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+ g_set_error(err, LR_YUM_ERROR, LRE_IO, "Invalid path: %s", location_href);
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+ g_slist_free_full(*targets, (GDestroyNotify) lr_downloadtarget_free);
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+ free(requested_dir);
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+ free(dest_dir);
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+ return FALSE;
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+ }
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+ free(requested_dir);
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+ free(dest_dir);
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+
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gboolean is_zchunk = FALSE;
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#ifdef WITH_ZCHUNK
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if (handle->cachedir && record->header_checksum)
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--
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2.28.0
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