From patchwork Fri Jan  4 23:19:10 2019
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Benedict Wong <benedictwong@google.com>
X-Patchwork-Id: 1020927
X-Patchwork-Delegate: shemminger@vyatta.com
Return-Path: <netdev-owner@vger.kernel.org>
X-Original-To: patchwork-incoming-netdev@ozlabs.org
Delivered-To: patchwork-incoming-netdev@ozlabs.org
Authentication-Results: ozlabs.org;
	spf=none (mailfrom) smtp.mailfrom=vger.kernel.org
	(client-ip=209.132.180.67; helo=vger.kernel.org;
	envelope-from=netdev-owner@vger.kernel.org;
	receiver=<UNKNOWN>)
Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none)
	header.from=google.com
Authentication-Results: ozlabs.org; dkim=pass (2048-bit key;
	unprotected) header.d=google.com header.i=@google.com
	header.b="V4CmuW6Q"; dkim-atps=neutral
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
	by ozlabs.org (Postfix) with ESMTP id 43Wgj41TGTz9s4s
	for <patchwork-incoming-netdev@ozlabs.org>;
	Sat,  5 Jan 2019 10:19:20 +1100 (AEDT)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1726176AbfADXTT (ORCPT
	<rfc822;patchwork-incoming-netdev@ozlabs.org>);
	Fri, 4 Jan 2019 18:19:19 -0500
Received: from mail-pl1-f201.google.com ([209.85.214.201]:36296 "EHLO
	mail-pl1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1726009AbfADXTS (ORCPT
	<rfc822;netdev@vger.kernel.org>); Fri, 4 Jan 2019 18:19:18 -0500
Received: by mail-pl1-f201.google.com with SMTP id e68so28061283plb.3
	for <netdev@vger.kernel.org>; Fri, 04 Jan 2019 15:19:18 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=google.com; s=20161025;
	h=date:message-id:mime-version:subject:from:to:cc;
	bh=0wx9NsaPW5J0KFmbUlwRFkRkluspRuq6fLEilOYDbDY=;
	b=V4CmuW6Q/cz08FYpph7nyZ3aUD0BXZL5+Fq3jyf0I4gcXuT8WbryZkQa6/qeO6Flj9
	QYg6Hny438HFx4bIFIrtuU2/hCUymaZkPyDY7W1qGU3ve/hATuqWDfqPOnZekECs6vR5
	r69PriOWoIX8bsD0a4LyomecpkuDMR2ZGfrISYSeQ2rCkLzvNw6BAgb8zyJJJ5YXbm4h
	QI/JKezsIlTJEUuydgLO51Wi5n/qGBR4O+Qai6ckx0ATgEx37o7iH0NN2vKP4n89vhO1
	GL68TxW/LcUJCbAPjKCZeVJ+7xZdujrZVW5yjbvCjISZh36VAKqv18RKVjXmkQ2IaymK
	RSYg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20161025;
	h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc;
	bh=0wx9NsaPW5J0KFmbUlwRFkRkluspRuq6fLEilOYDbDY=;
	b=kvKq8fSagmTeIgsDI+btcGsSzn4oBnJuwoJHOlDyqhkvN4bOrK/njRnqlAvBiCr5VH
	7Sbfkzpeh/afc6UpgSEN2Z4wBR+j/jQKv3uTu1v/EYysQVZTqTlm+fy8NnYdUkx2Y7a8
	THFrYpbc/wNLm1xGBZewQ/WKiXNBisqZTViHAjifx1wOJV+YOl2/oBuOdVydzzNtq5wS
	V4hnTyOwusw7aFbkv2j6FHuBga9ohlVNS8RE59KrRFWdig/CrUzwDZURD2ooliNQFOSg
	mQmwIoU2gZY4bdVQonN/xu+t7c7yPZ6ltdMbqN+Q7ypcXz/0FZ+0dOMBLTTIF7hKf4BT
	RE7w==
X-Gm-Message-State: AJcUukfzZHUbfpJYWd72dGXoUlMoZ9BL5tPeCM7JAovYV4PpKJKTI3k/
	6C03jnhsgQUf4eQT0u15WfcXVIMqSDKmUULKnjbRnuK9RI6WrHZd0BrdvO8AA2K2RrFFbOqjfW6
	LehGqpEXTg4m3l5Tqt1Ckw23sFA8bnTn/3fOXeuZns7CXwZAHhAeoGk9eUsWg8nr1ph6MDhHCff
	HZ2w==
X-Google-Smtp-Source: 
 AFSGD/XQQ32xuXGd0eKSW+bdUHLlv1rPumAschGFh35iiLbc3rybeu4rEvGGLlND+U+yI+v8jJgz54ak6pxSxXjozOg=
X-Received: by 2002:a62:464c:: with SMTP id
	t73mr24032009pfa.140.1546643957542;
	Fri, 04 Jan 2019 15:19:17 -0800 (PST)
Date: Fri,  4 Jan 2019 15:19:10 -0800
Message-Id: <20190104231910.54517-1-benedictwong@google.com>
Mime-Version: 1.0
X-Mailer: git-send-email 2.20.1.97.g81188d93c3-goog
Subject: [RFC iproute2] xfrm: add option to hide keys in state output
From: Benedict Wong <benedictwong@google.com>
To: netdev@vger.kernel.org
Cc: nharold@google.com, benedictwong@google.com, lorenzo@google.com,
	maze@google.com
Sender: netdev-owner@vger.kernel.org
Precedence: bulk
List-ID: <netdev.vger.kernel.org>
X-Mailing-List: netdev@vger.kernel.org

ip xfrm state show currently dumps keys unconditionally. This limits its
use in logging, as security information can be leaked.

This patch adds a nokeys option to ip xfrm ( state show | monitor ), which
prevents the printing of keys. This allows ip xfrm state show to be used
in logging without exposing keys.

Signed-off-by: Benedict Wong <benedictwong@google.com>
---
 ip/ipxfrm.c        | 45 +++++++++++++++++++++++++--------------------
 ip/xfrm.h          |  5 +++--
 ip/xfrm_monitor.c  |  7 +++++--
 ip/xfrm_state.c    | 27 ++++++++++++++++++++++-----
 man/man8/ip-xfrm.8 | 15 ++++++++++++++-
 5 files changed, 69 insertions(+), 30 deletions(-)

diff --git a/ip/ipxfrm.c b/ip/ipxfrm.c
index 2dea4e37..1334ca9f 100644
--- a/ip/ipxfrm.c
+++ b/ip/ipxfrm.c
@@ -497,7 +497,8 @@ void xfrm_selector_print(struct xfrm_selector *sel, __u16 family,
 }
 
 static void __xfrm_algo_print(struct xfrm_algo *algo, int type, int len,
-			      FILE *fp, const char *prefix, int newline)
+			      FILE *fp, const char *prefix, int newline,
+			      bool nokeys)
 {
 	int keylen;
 	int i;
@@ -521,7 +522,9 @@ static void __xfrm_algo_print(struct xfrm_algo *algo, int type, int len,
 		goto fin;
 	}
 
-	if (keylen > 0) {
+	if (nokeys)
+		fprintf(fp, "<<Keys hidden>>");
+	else if (keylen > 0) {
 		fprintf(fp, "0x");
 		for (i = 0; i < keylen; i++)
 			fprintf(fp, "%.2x", (unsigned char)algo->alg_key[i]);
@@ -536,13 +539,13 @@ static void __xfrm_algo_print(struct xfrm_algo *algo, int type, int len,
 }
 
 static inline void xfrm_algo_print(struct xfrm_algo *algo, int type, int len,
-				   FILE *fp, const char *prefix)
+				   FILE *fp, const char *prefix, bool nokeys)
 {
-	return __xfrm_algo_print(algo, type, len, fp, prefix, 1);
+	return __xfrm_algo_print(algo, type, len, fp, prefix, 1, nokeys);
 }
 
 static void xfrm_aead_print(struct xfrm_algo_aead *algo, int len,
-			    FILE *fp, const char *prefix)
+			    FILE *fp, const char *prefix, bool nokeys)
 {
 	struct xfrm_algo *base_algo = alloca(sizeof(*base_algo) + algo->alg_key_len / 8);
 
@@ -550,7 +553,8 @@ static void xfrm_aead_print(struct xfrm_algo_aead *algo, int len,
 	base_algo->alg_key_len = algo->alg_key_len;
 	memcpy(base_algo->alg_key, algo->alg_key, algo->alg_key_len / 8);
 
-	__xfrm_algo_print(base_algo, XFRMA_ALG_AEAD, len, fp, prefix, 0);
+	__xfrm_algo_print(base_algo,
+			  XFRMA_ALG_AEAD, len, fp, prefix, 0, nokeys);
 
 	fprintf(fp, " %d", algo->alg_icv_len);
 
@@ -558,7 +562,7 @@ static void xfrm_aead_print(struct xfrm_algo_aead *algo, int len,
 }
 
 static void xfrm_auth_trunc_print(struct xfrm_algo_auth *algo, int len,
-				  FILE *fp, const char *prefix)
+				  FILE *fp, const char *prefix, bool nokeys)
 {
 	struct xfrm_algo *base_algo = alloca(sizeof(*base_algo) + algo->alg_key_len / 8);
 
@@ -566,7 +570,8 @@ static void xfrm_auth_trunc_print(struct xfrm_algo_auth *algo, int len,
 	base_algo->alg_key_len = algo->alg_key_len;
 	memcpy(base_algo->alg_key, algo->alg_key, algo->alg_key_len / 8);
 
-	__xfrm_algo_print(base_algo, XFRMA_ALG_AUTH_TRUNC, len, fp, prefix, 0);
+	__xfrm_algo_print(base_algo,
+			  XFRMA_ALG_AUTH_TRUNC, len, fp, prefix, 0, nokeys);
 
 	fprintf(fp, " %d", algo->alg_trunc_len);
 
@@ -679,7 +684,7 @@ done:
 }
 
 void xfrm_xfrma_print(struct rtattr *tb[], __u16 family,
-		      FILE *fp, const char *prefix)
+		      FILE *fp, const char *prefix, bool nokeys)
 {
 	if (tb[XFRMA_MARK]) {
 		struct rtattr *rta = tb[XFRMA_MARK];
@@ -700,36 +705,36 @@ void xfrm_xfrma_print(struct rtattr *tb[], __u16 family,
 	if (tb[XFRMA_ALG_AUTH] && !tb[XFRMA_ALG_AUTH_TRUNC]) {
 		struct rtattr *rta = tb[XFRMA_ALG_AUTH];
 
-		xfrm_algo_print(RTA_DATA(rta),
-				XFRMA_ALG_AUTH, RTA_PAYLOAD(rta), fp, prefix);
+		xfrm_algo_print(RTA_DATA(rta), XFRMA_ALG_AUTH,
+				RTA_PAYLOAD(rta), fp, prefix, nokeys);
 	}
 
 	if (tb[XFRMA_ALG_AUTH_TRUNC]) {
 		struct rtattr *rta = tb[XFRMA_ALG_AUTH_TRUNC];
 
 		xfrm_auth_trunc_print(RTA_DATA(rta),
-				      RTA_PAYLOAD(rta), fp, prefix);
+				      RTA_PAYLOAD(rta), fp, prefix, nokeys);
 	}
 
 	if (tb[XFRMA_ALG_AEAD]) {
 		struct rtattr *rta = tb[XFRMA_ALG_AEAD];
 
 		xfrm_aead_print(RTA_DATA(rta),
-				RTA_PAYLOAD(rta), fp, prefix);
+				RTA_PAYLOAD(rta), fp, prefix, nokeys);
 	}
 
 	if (tb[XFRMA_ALG_CRYPT]) {
 		struct rtattr *rta = tb[XFRMA_ALG_CRYPT];
 
-		xfrm_algo_print(RTA_DATA(rta),
-				XFRMA_ALG_CRYPT, RTA_PAYLOAD(rta), fp, prefix);
+		xfrm_algo_print(RTA_DATA(rta), XFRMA_ALG_CRYPT,
+				RTA_PAYLOAD(rta), fp, prefix, nokeys);
 	}
 
 	if (tb[XFRMA_ALG_COMP]) {
 		struct rtattr *rta = tb[XFRMA_ALG_COMP];
 
-		xfrm_algo_print(RTA_DATA(rta),
-				XFRMA_ALG_COMP, RTA_PAYLOAD(rta), fp, prefix);
+		xfrm_algo_print(RTA_DATA(rta), XFRMA_ALG_COMP,
+				RTA_PAYLOAD(rta), fp, prefix, nokeys);
 	}
 
 	if (tb[XFRMA_ENCAP]) {
@@ -897,7 +902,7 @@ static int xfrm_selector_iszero(struct xfrm_selector *s)
 
 void xfrm_state_info_print(struct xfrm_usersa_info *xsinfo,
 			    struct rtattr *tb[], FILE *fp, const char *prefix,
-			    const char *title)
+			    const char *title, bool nokeys)
 {
 	char buf[STRBUF_SIZE] = {};
 	int force_spi = xfrm_xfrmproto_is_ipsec(xsinfo->id.proto);
@@ -943,7 +948,7 @@ void xfrm_state_info_print(struct xfrm_usersa_info *xsinfo,
 		fprintf(fp, " (0x%s)", strxf_mask8(xsinfo->flags));
 	fprintf(fp, "%s", _SL_);
 
-	xfrm_xfrma_print(tb, xsinfo->family, fp, buf);
+	xfrm_xfrma_print(tb, xsinfo->family, fp, buf, nokeys);
 
 	if (!xfrm_selector_iszero(&xsinfo->sel)) {
 		char sbuf[STRBUF_SIZE];
@@ -1071,7 +1076,7 @@ void xfrm_policy_info_print(struct xfrm_userpolicy_info *xpinfo,
 	if (show_stats > 0)
 		xfrm_lifetime_print(&xpinfo->lft, &xpinfo->curlft, fp, buf);
 
-	xfrm_xfrma_print(tb, xpinfo->sel.family, fp, buf);
+	xfrm_xfrma_print(tb, xpinfo->sel.family, fp, buf, false);
 }
 
 int xfrm_id_parse(xfrm_address_t *saddr, struct xfrm_id *id, __u16 *family,
diff --git a/ip/xfrm.h b/ip/xfrm.h
index 72390d79..9ba5ca61 100644
--- a/ip/xfrm.h
+++ b/ip/xfrm.h
@@ -105,6 +105,7 @@ struct xfrm_filter {
 extern struct xfrm_filter filter;
 
 int xfrm_state_print(struct nlmsghdr *n, void *arg);
+int xfrm_state_print_nokeys(struct nlmsghdr *n, void *arg);
 int xfrm_policy_print(struct nlmsghdr *n, void *arg);
 int do_xfrm_state(int argc, char **argv);
 int do_xfrm_policy(int argc, char **argv);
@@ -124,10 +125,10 @@ const char *strxf_ptype(__u8 ptype);
 void xfrm_selector_print(struct xfrm_selector *sel, __u16 family,
 			 FILE *fp, const char *prefix);
 void xfrm_xfrma_print(struct rtattr *tb[], __u16 family,
-		      FILE *fp, const char *prefix);
+		      FILE *fp, const char *prefix, bool nokeys);
 void xfrm_state_info_print(struct xfrm_usersa_info *xsinfo,
 			    struct rtattr *tb[], FILE *fp, const char *prefix,
-			   const char *title);
+			   const char *title, bool nokeys);
 void xfrm_policy_info_print(struct xfrm_userpolicy_info *xpinfo,
 			    struct rtattr *tb[], FILE *fp, const char *prefix,
 			    const char *title);
diff --git a/ip/xfrm_monitor.c b/ip/xfrm_monitor.c
index 76905ed3..17117f41 100644
--- a/ip/xfrm_monitor.c
+++ b/ip/xfrm_monitor.c
@@ -35,10 +35,11 @@
 
 static void usage(void) __attribute__((noreturn));
 static int listen_all_nsid;
+static bool nokeys;
 
 static void usage(void)
 {
-	fprintf(stderr, "Usage: ip xfrm monitor [all-nsid] [ all | OBJECTS | help ]\n");
+	fprintf(stderr, "Usage: ip xfrm monitor [ nokeys ] [ all-nsid ] [ all | OBJECTS | help ]\n");
 	fprintf(stderr, "OBJECTS := { acquire | expire | SA | aevent | policy | report }\n");
 	exit(-1);
 }
@@ -197,7 +198,7 @@ static int xfrm_report_print(struct nlmsghdr *n, void *arg)
 
 	parse_rtattr(tb, XFRMA_MAX, XFRMREP_RTA(xrep), len);
 
-	xfrm_xfrma_print(tb, family, fp, "  ");
+	xfrm_xfrma_print(tb, family, fp, "  ", nokeys);
 
 	if (oneline)
 		fprintf(fp, "\n");
@@ -352,6 +353,8 @@ int do_xfrm_monitor(int argc, char **argv)
 		if (matches(*argv, "file") == 0) {
 			NEXT_ARG();
 			file = *argv;
+		} else if (strcmp(*argv, "nokeys") == 0) {
+			nokeys = true;
 		} else if (strcmp(*argv, "all") == 0) {
 			/* fall out */
 		} else if (matches(*argv, "all-nsid") == 0) {
diff --git a/ip/xfrm_state.c b/ip/xfrm_state.c
index e8c01746..d8f9350e 100644
--- a/ip/xfrm_state.c
+++ b/ip/xfrm_state.c
@@ -65,7 +65,9 @@ static void usage(void)
 	fprintf(stderr, "Usage: ip xfrm state allocspi ID [ mode MODE ] [ mark MARK [ mask MASK ] ]\n");
 	fprintf(stderr, "        [ reqid REQID ] [ seq SEQ ] [ min SPI max SPI ]\n");
 	fprintf(stderr, "Usage: ip xfrm state { delete | get } ID [ mark MARK [ mask MASK ] ]\n");
-	fprintf(stderr, "Usage: ip xfrm state { deleteall | list } [ ID ] [ mode MODE ] [ reqid REQID ]\n");
+	fprintf(stderr, "Usage: ip xfrm state { deleteall } [ ID ] [ mode MODE ] [ reqid REQID ]\n");
+	fprintf(stderr, "        [ flag FLAG-LIST ]\n");
+	fprintf(stderr, "Usage: ip xfrm state { list } [ nokeys ] [ ID ] [ mode MODE ] [ reqid REQID ]\n");
 	fprintf(stderr, "        [ flag FLAG-LIST ]\n");
 	fprintf(stderr, "Usage: ip xfrm state flush [ proto XFRM-PROTO ]\n");
 	fprintf(stderr, "Usage: ip xfrm state count\n");
@@ -908,7 +910,7 @@ static int xfrm_state_filter_match(struct xfrm_usersa_info *xsinfo)
 	return 1;
 }
 
-int xfrm_state_print(struct nlmsghdr *n, void *arg)
+static int __do_xfrm_state_print(struct nlmsghdr *n, void *arg, bool nokeys)
 {
 	FILE *fp = (FILE *)arg;
 	struct rtattr *tb[XFRMA_MAX+1];
@@ -979,7 +981,7 @@ int xfrm_state_print(struct nlmsghdr *n, void *arg)
 		xsinfo = RTA_DATA(tb[XFRMA_SA]);
 	}
 
-	xfrm_state_info_print(xsinfo, tb, fp, NULL, NULL);
+	xfrm_state_info_print(xsinfo, tb, fp, NULL, NULL, nokeys);
 
 	if (n->nlmsg_type == XFRM_MSG_EXPIRE) {
 		fprintf(fp, "\t");
@@ -994,6 +996,16 @@ int xfrm_state_print(struct nlmsghdr *n, void *arg)
 	return 0;
 }
 
+int xfrm_state_print(struct nlmsghdr *n, void *arg)
+{
+	return __do_xfrm_state_print(n, arg, false);
+}
+
+int xfrm_state_print_nokeys(struct nlmsghdr *n, void *arg)
+{
+	return __do_xfrm_state_print(n, arg, true);
+}
+
 static int xfrm_state_get_or_delete(int argc, char **argv, int delete)
 {
 	struct rtnl_handle rth;
@@ -1145,13 +1157,16 @@ static int xfrm_state_list_or_deleteall(int argc, char **argv, int deleteall)
 {
 	char *idp = NULL;
 	struct rtnl_handle rth;
+	bool nokeys = false;
 
 	if (argc > 0)
 		filter.use = 1;
 	filter.xsinfo.family = preferred_family;
 
 	while (argc > 0) {
-		if (strcmp(*argv, "mode") == 0) {
+		if (strcmp(*argv, "nokeys") == 0) {
+			nokeys = true;
+		} else if (strcmp(*argv, "mode") == 0) {
 			NEXT_ARG();
 			xfrm_mode_parse(&filter.xsinfo.mode, &argc, &argv);
 
@@ -1267,7 +1282,9 @@ static int xfrm_state_list_or_deleteall(int argc, char **argv, int deleteall)
 			exit(1);
 		}
 
-		if (rtnl_dump_filter(&rth, xfrm_state_print, stdout) < 0) {
+		rtnl_filter_t filter = nokeys ?
+				xfrm_state_print_nokeys : xfrm_state_print;
+		if (rtnl_dump_filter(&rth, filter, stdout) < 0) {
 			fprintf(stderr, "Dump terminated\n");
 			exit(1);
 		}
diff --git a/man/man8/ip-xfrm.8 b/man/man8/ip-xfrm.8
index 839e06aa..0fdf97d9 100644
--- a/man/man8/ip-xfrm.8
+++ b/man/man8/ip-xfrm.8
@@ -89,7 +89,7 @@ ip-xfrm \- transform configuration
 .IR MASK " ] ]"
 
 .ti -8
-.BR "ip xfrm state" " { " deleteall " | " list " } ["
+.BR "ip xfrm state" " { " deleteall " } ["
 .IR ID " ]"
 .RB "[ " mode
 .IR MODE " ]"
@@ -98,6 +98,17 @@ ip-xfrm \- transform configuration
 .RB "[ " flag
 .IR FLAG-LIST " ]"
 
+.ti -8
+.BR "ip xfrm state" " { " list " } ["
+.IR ID " ]"
+.RB "[ " nokeys " ]"
+.RB "[ " mode
+.IR MODE " ]"
+.RB "[ " reqid
+.IR REQID " ]"
+.RB "[ " flag
+.IR FLAG-LIST " ]"
+
 .ti -8
 .BR "ip xfrm state flush" " [ " proto
 .IR XFRM-PROTO " ]"
@@ -381,6 +392,8 @@ ip-xfrm \- transform configuration
 .BR "ip xfrm monitor" " ["
 .BI all-nsid
 ] [
+.BI nokeys
+] [
 .BI all
  |
 .IR LISTofXFRM-OBJECTS " ]"