From patchwork Thu Oct 21 15:38:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ondrej Mosnacek X-Patchwork-Id: 12575649 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD44CC433F5 for ; Thu, 21 Oct 2021 15:38:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3027611BD for ; Thu, 21 Oct 2021 15:38:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231239AbhJUPlH (ORCPT ); Thu, 21 Oct 2021 11:41:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38668 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229702AbhJUPlH (ORCPT ); Thu, 21 Oct 2021 11:41:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634830731; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=+EcsA5xA62SASzXixhmC93KNhr9lJl6sDYMGeSe6uVI=; b=cbOIu0fBSztt09F89X/RxQ6fo21raAYUq3nmn1oRqkXK65QXgWQ4WjE2d6dQkw9rmt0Ogk DBN8jwA9lv/cMCHN9uMdzZbYjcGy1PjF1MuM6lEkiAhxE79alBVPVau6QR5lDpvvEj9e/8 dli2IiXF3gR5amZ3UMk1PwGICJIATFk= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-514-cS-Z1Ak2NFW2cRKbWXziRQ-1; Thu, 21 Oct 2021 11:38:49 -0400 X-MC-Unique: cS-Z1Ak2NFW2cRKbWXziRQ-1 Received: by mail-ed1-f72.google.com with SMTP id c25-20020a056402143900b003dc19782ea8so797561edx.3 for ; Thu, 21 Oct 2021 08:38:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=+EcsA5xA62SASzXixhmC93KNhr9lJl6sDYMGeSe6uVI=; b=DFMZlCM+G1AAF3HmDtdVG0FHe5SvFmpXJr7LrOi3wrlMKT8hui0WZjRoAQzT+LtZUS dyxNMS1SjFS1/urIFlFfJ88F2nAE11SsZqtsOUHlJsDBk1LzUd+XE4gSJxIhXxx4zuW5 m8A47XWseyrthPpzvfG5r9ItBSiD5kikDnzrrbeeeNone8S5QYhnJc89XvTetbNX5YLP UVidqSveDpAMfC6wlm/GBRIJmf+tJRIzqiIzd/7uRXlC5fHzEZKbmm1t7tCqGWmM9rhu FRiV+fCBQQKHrVgKdCcrg/6NBtVe6js9onWbh8SDiNmzMDdFFi91qS233oQOIDYMucpC DMLA== X-Gm-Message-State: AOAM53254cxm8tAk9HKGr31NrPPSIk5KBzxMWAoRt/oOgGgftjtXrU7u PnTGlzDP8T4CyLYSJwMK7vMV1LXulq+niUN5N2oYDdnNuZ7KOhCU+KmWRHXZn4hin9N3pH/mzSz Gpxalv582kAzdSmdwhQ== X-Received: by 2002:a17:906:2f16:: with SMTP id v22mr8071842eji.126.1634830728417; Thu, 21 Oct 2021 08:38:48 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyZR+CO01yUtF69fE5uCzw+dfcRHloUejfPdnzpavQSqGCijkHMjiG35GlcCLD4jjcVPR+jBw== X-Received: by 2002:a17:906:2f16:: with SMTP id v22mr8071810eji.126.1634830728139; Thu, 21 Oct 2021 08:38:48 -0700 (PDT) Received: from localhost.localdomain (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id j11sm2659826ejt.114.2021.10.21.08.38.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Oct 2021 08:38:47 -0700 (PDT) From: Ondrej Mosnacek To: Vlad Yasevich , Neil Horman , Marcelo Ricardo Leitner Cc: linux-sctp@vger.kernel.org, netdev@vger.kernel.org, selinux@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Haines Subject: [PATCH] sctp: initialize endpoint LSM labels also on the client side Date: Thu, 21 Oct 2021 17:38:46 +0200 Message-Id: <20211021153846.745289-1-omosnace@redhat.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org The secid* fields in struct sctp_endpoint are used to initialize the labels of a peeloff socket created from the given association. Currently they are initialized properly when a new association is created on the server side (upon receiving an INIT packet), but not on the client side. As a result, when the client obtains a peeloff socket via sctp_peeloff(3) under SELinux, it ends up unlabeled, leading to unexpected denials. Fix this by calling the security_sctp_assoc_request() hook also upon receiving a valid INIT-ACK response from the server, so that the endpoint labels are properly initialized also on the client side. Fixes: 2277c7cd75e3 ("sctp: Add LSM hooks") Cc: Richard Haines Signed-off-by: Ondrej Mosnacek --- include/net/sctp/structs.h | 11 ++++++----- net/sctp/sm_statefuns.c | 5 +++++ 2 files changed, 11 insertions(+), 5 deletions(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 651bba654d77..033a955592dd 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -1356,11 +1356,12 @@ struct sctp_endpoint { __u8 strreset_enable; - /* Security identifiers from incoming (INIT). These are set by - * security_sctp_assoc_request(). These will only be used by - * SCTP TCP type sockets and peeled off connections as they - * cause a new socket to be generated. security_sctp_sk_clone() - * will then plug these into the new socket. + /* Security identifiers from incoming (INIT/INIT-ACK). These + * are set by security_sctp_assoc_request(). These will only + * be used by SCTP TCP type sockets and peeled off connections + * as they cause a new socket to be generated. + * security_sctp_sk_clone() will then plug these into the new + * socket. */ u32 secid; diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 32df65f68c12..cb291c7f5fb7 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -521,6 +521,11 @@ enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, if (!sctp_vtag_verify(chunk, asoc)) return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); + /* Update socket peer label if first association. */ + if (security_sctp_assoc_request((struct sctp_endpoint *)ep, + chunk->skb)) + return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); + /* 6.10 Bundling * An endpoint MUST NOT bundle INIT, INIT ACK or * SHUTDOWN COMPLETE with any other chunks.