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From 6e811d78e2719988ae291181f5b133af32ce62d8 Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Thu, 23 Apr 2015 14:46:27 +0200
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Subject: [ABRT PATCH] dbus: process only valid sub-directories of the dump
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location
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Must have correct rights and must be a direct sub-directory of the dump
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location.
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This issue was discovered by Florian Weimer of Red Hat Product Security.
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Related: #1214451
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Signed-off-by: Jakub Filak <jfilak@redhat.com>
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---
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src/dbus/abrt-dbus.c | 36 ++++++++++++++++++++++++++----------
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1 file changed, 26 insertions(+), 10 deletions(-)
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diff --git a/src/dbus/abrt-dbus.c b/src/dbus/abrt-dbus.c
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index 308a9af..7400dff 100644
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--- a/src/dbus/abrt-dbus.c
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+++ b/src/dbus/abrt-dbus.c
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@@ -132,18 +132,34 @@ static uid_t get_caller_uid(GDBusConnection *connection, GDBusMethodInvocation *
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return caller_uid;
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}
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-static bool allowed_problem_dir(const char *dir_name)
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+bool allowed_problem_dir(const char *dir_name)
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{
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-//HACK HACK HACK! Disabled for now until we fix clients (abrt-gui) to not pass /home/user/.cache/abrt/spool
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+ if (!dir_is_in_dump_location(dir_name))
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+ {
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+ error_msg("Bad problem directory name '%s', should start with: '%s'", dir_name, g_settings_dump_location);
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+ return false;
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+ }
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+
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+ /* We cannot test correct permissions yet because we still need to chown
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+ * dump directories before reporting and Chowing changes the file owner to
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+ * the reporter, which causes this test to fail and prevents users from
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+ * getting problem data after reporting it.
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+ *
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+ * Fortunately, libreport has been hardened against hard link and symbolic
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+ * link attacks and refuses to work with such files, so this test isn't
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+ * really necessary, however, we will use it once we get rid of the
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+ * chowning files.
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+ *
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+ * abrt-server refuses to run post-create on directories that have
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+ * incorrect owner (not "root:(abrt|root)"), incorrect permissions (other
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+ * bits are not 0) and are complete (post-create finished). So, there is no
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+ * way to run security sensitive event scripts (post-create) on crafted
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+ * problem directories.
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+ */
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#if 0
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- unsigned len = strlen(g_settings_dump_location);
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-
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- /* If doesn't start with "g_settings_dump_location[/]"... */
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- if (strncmp(dir_name, g_settings_dump_location, len) != 0
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- || (dir_name[len] != '/' && dir_name[len] != '\0')
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- /* or contains "/." anywhere (-> might contain ".." component) */
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- || strstr(dir_name + len, "/.")
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- ) {
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+ if (!dir_has_correct_permissions(dir_name))
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+ {
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+ error_msg("Problem directory '%s' isn't owned by root:abrt or others are not restricted from access", dir_name);
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return false;
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}
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#endif
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--
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1.8.3.1
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