From patchwork Thu Jul 22 00:47:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12392685 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAC05C6377A for ; Thu, 22 Jul 2021 01:08:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9ECD6124C for ; Thu, 22 Jul 2021 01:08:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230117AbhGVA13 (ORCPT ); Wed, 21 Jul 2021 20:27:29 -0400 Received: from sonic313-16.consmr.mail.ne1.yahoo.com ([66.163.185.39]:43834 "EHLO sonic313-16.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229974AbhGVA13 (ORCPT ); Wed, 21 Jul 2021 20:27:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626916084; bh=tJAwSelRtnA20TVgVj9Y3KhFAdN3sk+uAxfLqwCxMqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=Lt6CLRqe2LO1sr/osGFQZt4FMecgSdrDN0qfICvy+9OcciO/xmY3ZZ2X0b+Omu2ry4kXok49cdOIr06zXMlEG+9e3grpe9pygirV/dCzW3RM7KGkhNeXP98Jf70VGUE9o9WkEWKIxid/eBvQeEnofz75XCQGwtl0XrBLpOH0KnomaNpYxnRKCyLA6ASwGIADLpULP2usrtRji4aEkZkA4UTh6nDiCH9UoSTYuQWOnRyEWTxoPoD1GOvCtehEycP5ecvPhcHuylGNnnRu4XoSHQuQckxNgac8ZPdaeUDGYhEepHp/HYOaxfXntRMLmwoFUTxrfMr385l8vnXaVmSi4A== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626916084; bh=/S10Cne118glpCJEOJ7LcWu8cu+6LV1b5bFXdIbxpiG=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=bsgm2xxoGBco9BOygySY9a6klOmRe445hyBVBbG4N5QQ7AoszbbO8VCCFAScO8L9GEa6IPOmaCgHISJght3BJdB1JNASsD1V/IFKCSK+9aOwbmbn8P6S5YYSJKVRPeNuL/+b3hP3FnAqxcDKhYpX/o5RR6VGKyskk+GlfCJ0AIjRhCpMopY+N7JiFAAvbkAkbHKzG//NgZNEx1jITAtpOazORtiAaDaS/uDfO53C9Takh+7uCsOfixpS2Px1/B4vBpn+FLPzmg66tyeA9QSGaQBwp6qhAP8oMcLqXgmCG5WqP/or3zWofC1LByjW8VC+8mpEIDetg+cIFzgDW3UA8w== X-YMail-OSG: wQHRWIkVM1kB40c.I4T0wArblMzb7K8.Fd1cMvI2D5Xn2XlKnScqm.VuOS6Gt2z o9SJnCwWouQuwxY2t5Xvu4fJT.zBpezv1FW.j1WBYfivuIHZXQGM6QdLhvzVKiDu_QX..W4eUgeD vCRmoW2vHg2vOx5Fvknl5YdX6ovuEDggw7.WXx3bZh0.a4LudSIzUpTekFAcrkm3alFjKTcPytXg 5.lksbFJC1izsELsp.CT1ZI71CdnUabAscJLiCcu57WUQa.yN_qFKln6eomAEXyAxLLOQvLoS1yj meJPDuplGMf9r1lP34KeFk.iC.gHCqIDK8G.xkwY91.qX7eMhwRRYmJr60St29eQbaW146tApXRp yyU9oG0lfi7qrjGnIcuQz.aFuFBimq.k9tPZef.YtHPtrWuWYYOXv6t5kdhbhPgGRmaVrxyxMsH. 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Ptz5jQnHUobMYDAuIm.PUPmjAhJsvPNQmTD.OReZtCyMYa_8r8F9DpjOyd0ZO4nY4GOHMY9DCPyr j_KoouR20ZtuwqyAZG.YjrRYCnlurQEfqjXKgEUQwoXMK9EVPKVjeh8sZHR5RGllEiVEMrmhS4Ag vwajZJ3wyYRfIr_6oWu4cLytqbtcG_Q4XM20qewFGguWnphj432qAC8PdlpYHAYVF X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic313.consmr.mail.ne1.yahoo.com with HTTP; Thu, 22 Jul 2021 01:08:04 +0000 Received: by kubenode523.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 73c59ba14959d5075c3acfdad7dcbf4c; Thu, 22 Jul 2021 01:08:00 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, Pablo Neira Ayuso , netdev@vger.kernel.org, netfilter-devel@vger.kernel.org Subject: [PATCH v28 18/25] LSM: security_secid_to_secctx in netlink netfilter Date: Wed, 21 Jul 2021 17:47:51 -0700 Message-Id: <20210722004758.12371-19-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210722004758.12371-1-casey@schaufler-ca.com> References: <20210722004758.12371-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: Change netlink netfilter interfaces to use lsmcontext pointers, and remove scaffolding. Reviewed-by: Kees Cook Reviewed-by: John Johansen Acked-by: Paul Moore Acked-by: Stephen Smalley Acked-by: Pablo Neira Ayuso Signed-off-by: Casey Schaufler Cc: netdev@vger.kernel.org Cc: netfilter-devel@vger.kernel.org --- net/netfilter/nfnetlink_queue.c | 37 +++++++++++++-------------------- 1 file changed, 14 insertions(+), 23 deletions(-) diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index d5cff4559237..cffb04baf7b8 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -301,15 +301,13 @@ static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) return -1; } -static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) +static void nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context) { - u32 seclen = 0; #if IS_ENABLED(CONFIG_NETWORK_SECMARK) struct lsmblob blob; - struct lsmcontext context = { }; if (!skb || !sk_fullsock(skb->sk)) - return 0; + return; read_lock_bh(&skb->sk->sk_callback_lock); @@ -318,14 +316,12 @@ static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata) * blob. security_secid_to_secctx() will know which security * module to use to create the secctx. */ lsmblob_init(&blob, skb->secmark); - security_secid_to_secctx(&blob, &context); - *secdata = context.context; + security_secid_to_secctx(&blob, context); } read_unlock_bh(&skb->sk->sk_callback_lock); - seclen = context.len; #endif - return seclen; + return; } static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry) @@ -397,12 +393,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, struct net_device *indev; struct net_device *outdev; struct nf_conn *ct = NULL; + struct lsmcontext context = { }; enum ip_conntrack_info ctinfo; struct nfnl_ct_hook *nfnl_ct; bool csum_verify; - struct lsmcontext scaff; /* scaffolding */ - char *secdata = NULL; - u32 seclen = 0; size = nlmsg_total_size(sizeof(struct nfgenmsg)) + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) @@ -470,9 +464,9 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, } if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) { - seclen = nfqnl_get_sk_secctx(entskb, &secdata); - if (seclen) - size += nla_total_size(seclen); + nfqnl_get_sk_secctx(entskb, &context); + if (context.len) + size += nla_total_size(context.len); } skb = alloc_skb(size, GFP_ATOMIC); @@ -602,7 +596,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, nfqnl_put_sk_uidgid(skb, entskb->sk) < 0) goto nla_put_failure; - if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata)) + if (context.len && + nla_put(skb, NFQA_SECCTX, context.len, context.context)) goto nla_put_failure; if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0) @@ -630,10 +625,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, } nlh->nlmsg_len = skb->len; - if (seclen) { - lsmcontext_init(&scaff, secdata, seclen, 0); - security_release_secctx(&scaff); - } + if (context.len) + security_release_secctx(&context); return skb; nla_put_failure: @@ -641,10 +634,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, kfree_skb(skb); net_err_ratelimited("nf_queue: error creating packet message\n"); nlmsg_failure: - if (seclen) { - lsmcontext_init(&scaff, secdata, seclen, 0); - security_release_secctx(&scaff); - } + if (context.len) + security_release_secctx(&context); return NULL; }