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From: Dag-Erling Smorgrav <des@FreeBSD.org>
Date: Tue, 13 Dec 2011 12:59:39 +0000 (UTC)
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Subject: svn commit: r228464 - stable/9/contrib/openpam/lib
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Author: des
Date: Tue Dec 13 12:59:39 2011
New Revision: 228464
URL: http://svn.freebsd.org/changeset/base/228464

Log:
  MFH r228384: validate the service name
  
  Approved by:	re (kib)
  Security:	some poorly thought out programs allow the user to specify
  		the service name; this patch makes it harder to trick these
  		programs into loading and executing arbitrary code.

Modified:
  stable/9/contrib/openpam/lib/openpam_configure.c
Directory Properties:
  stable/9/contrib/openpam/   (props changed)

Modified: stable/9/contrib/openpam/lib/openpam_configure.c
==============================================================================
--- stable/9/contrib/openpam/lib/openpam_configure.c	Tue Dec 13 11:54:51 2011	(r228463)
+++ stable/9/contrib/openpam/lib/openpam_configure.c	Tue Dec 13 12:59:39 2011	(r228464)
@@ -285,6 +285,13 @@ openpam_load_chain(pam_handle_t *pamh,
 	size_t len;
 	int r;
 
+	/* don't allow to escape from policy_path */
+	if (strchr(service, '/')) {
+		openpam_log(PAM_LOG_ERROR, "invalid service name: %s",
+		    service);
+		return (-PAM_SYSTEM_ERR);
+	}
+
 	for (path = openpam_policy_path; *path != NULL; ++path) {
 		len = strlen(*path);
 		if ((*path)[len - 1] == '/') {