From patchwork Wed Sep 30 09:49:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Haines X-Patchwork-Id: 11839127 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 75C0E17C9 for ; Thu, 15 Oct 2020 12:09:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B60B22210 for ; Thu, 15 Oct 2020 12:09:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=btinternet.com header.i=@btinternet.com header.b="FU55HmcF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726157AbgJOMJI (ORCPT ); Thu, 15 Oct 2020 08:09:08 -0400 Received: from mailomta1-re.btinternet.com ([213.120.69.94]:46859 "EHLO re-prd-fep-048.btinternet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727157AbgJOMJI (ORCPT ); Thu, 15 Oct 2020 08:09:08 -0400 Received: from re-prd-rgout-005.btmx-prd.synchronoss.net ([10.2.54.8]) by re-prd-fep-040.btinternet.com with ESMTP id <20200930094938.CXJB10362.re-prd-fep-040.btinternet.com@re-prd-rgout-005.btmx-prd.synchronoss.net>; Wed, 30 Sep 2020 10:49:38 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btmx201904; t=1601459378; bh=+vrKffhYTy6fGNPYV9F9FxF8k25qSn8lVNOuV3fc2mM=; h=From:To:Cc:Subject:Date:Message-Id:X-Mailer:In-Reply-To:References:MIME-Version; b=FU55HmcF/ENPIbyVDdXqTwXsN5gtSZMAdAxjMIr6CqyptHLuIvEAnaMhy2nEZwVr3GLBbWU2HkYOJ2Roz/vpcaw55ql+XlFi0eUdO8CQjj6EhQFEvQ8vLUKuO9Pwy4G4VZEqYYp2t8d7Xk5e15wup3WADKFe8589u8AULB95Q2+Cg/6cT36leqErxiZPv7r3YpWW3CS8MzpZV6u+MBQufHwSauXbvyw+Pa0EPT+PCdZpgH1Y7qu3PAqed/B1WUV4VQF8d9xQQXBGHVE2gdTKf+lemEcjHEPNsD8da/GLS0eTLeXlzJWw0WbLYi1IFSepPPpZyKtk/fJ7Aj+Jl8wKqw== Authentication-Results: btinternet.com; none X-Originating-IP: [81.141.56.129] X-OWM-Source-IP: 81.141.56.129 (GB) X-OWM-Env-Sender: richard_c_haines@btinternet.com X-VadeSecure-score: verdict=clean score=0/300, class=clean X-RazorGate-Vade: gggruggvucftvghtrhhoucdtuddrgedujedrfedvgdduhecutefuodetggdotefrodftvfcurfhrohhfihhlvgemuceutffkvffkuffjvffgnffgvefqofdpqfgfvfenuceurghilhhouhhtmecufedtudenucenucfjughrpefhvffufffkofgjfhgggfestdekredtredttdenucfhrhhomheptfhitghhrghrugcujfgrihhnvghsuceorhhitghhrghruggptggphhgrihhnvghssegsthhinhhtvghrnhgvthdrtghomheqnecuggftrfgrthhtvghrnhepuedttdelleehueeggfeihfeitdehueekffeviedtffegffeiueegleejgeevgfeinecukfhppeekuddrudeguddrheeirdduvdelnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehhvghloheplhhotggrlhhhohhsthdrlhhotggrlhguohhmrghinhdpihhnvghtpeekuddrudeguddrheeirdduvdelpdhmrghilhhfrhhomhepoehrihgthhgrrhgupggtpghhrghinhgvshessghtihhnthgvrhhnvghtrdgtohhmqedprhgtphhtthhopeeojhhmohhrrhhishesnhgrmhgvihdrohhrgheqpdhrtghpthhtohepoehlrghfohhrghgvsehgnhhumhhonhhkshdrohhrgheqpdhrtghpthhtohepoehlihhnuhigqdhsvggtuhhrihhthidqmhhoughulhgvsehvghgvrhdrkhgvrhhnvghlrdhorhhgqedprhgtphhtthhopeeonhgvthguvghvsehvghgvrhdrkhgvrhhnvghlrdhorhhgqedprhgtphhtthhopeeoohhsmhhotghomhdqnhgvthdqghhp rhhssehlihhsthhsrdhoshhmohgtohhmrdhorhhgqedprhgtphhtthhopeeophgrsghlohesnhgvthhfihhlthgvrhdrohhrgheqpdhrtghpthhtohepoehprghulhesphgruhhlqdhmohhorhgvrdgtohhmqedprhgtphhtthhopeeorhhitghhrghruggptggphhgrihhnvghssegsthhinhhtvghrnhgvthdrtghomhequcfqtfevrffvpehrfhgtkedvvdenrhhitghhrghruggptggphhgrihhnvghssegsthhinhhtvghrnhgvthdrtghomhdprhgtphhtthhopeeoshgvlhhinhhugiesvhhgvghrrdhkvghrnhgvlhdrohhrgheqpdhrtghpthhtohepoehsthgvphhhvghnrdhsmhgrlhhlvgihrdifohhrkhesghhmrghilhdrtghomheq X-RazorGate-Vade-Verdict: clean 0 X-RazorGate-Vade-Classification: clean X-SNCR-hdrdom: btinternet.com Received: from localhost.localdomain (81.141.56.129) by re-prd-rgout-005.btmx-prd.synchronoss.net (5.8.340) (authenticated as richard_c_haines@btinternet.com) id 5ED9C74D136117CE; Wed, 30 Sep 2020 10:49:38 +0100 From: Richard Haines To: selinux@vger.kernel.org, linux-security-module@vger.kernel.org, osmocom-net-gprs@lists.osmocom.org, netdev@vger.kernel.org Cc: stephen.smalley.work@gmail.com, paul@paul-moore.com, pablo@netfilter.org, laforge@gnumonks.org, jmorris@namei.org, Richard Haines Subject: [PATCH 2/3] gtp: Add LSM hooks to GPRS Tunneling Protocol (GTP) Date: Wed, 30 Sep 2020 10:49:33 +0100 Message-Id: <20200930094934.32144-3-richard_c_haines@btinternet.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200930094934.32144-1-richard_c_haines@btinternet.com> References: <20200930094934.32144-1-richard_c_haines@btinternet.com> MIME-Version: 1.0 Precedence: bulk List-ID: Add security hooks to allow security modules to exercise access control over GTP. The 'struct gtp_dev' has been moved to include/net/gtp.h so that it is visible to LSM security modules where their security blob is stored. Signed-off-by: Richard Haines --- drivers/net/gtp.c | 50 ++++++++++++++++++++++++++++++++--------------- include/net/gtp.h | 21 ++++++++++++++++++++ 2 files changed, 55 insertions(+), 16 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index 21640a035..100ee4f9c 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -60,21 +60,6 @@ struct pdp_ctx { struct rcu_head rcu_head; }; -/* One instance of the GTP device. */ -struct gtp_dev { - struct list_head list; - - struct sock *sk0; - struct sock *sk1u; - - struct net_device *dev; - - unsigned int role; - unsigned int hash_size; - struct hlist_head *tid_hash; - struct hlist_head *addr_hash; -}; - static unsigned int gtp_net_id __read_mostly; struct gtp_net { @@ -663,6 +648,10 @@ static int gtp_newlink(struct net *src_net, struct net_device *dev, gtp = netdev_priv(dev); + err = security_gtp_dev_alloc(gtp); + if (err < 0) + return err; + err = gtp_encap_enable(gtp, data); if (err < 0) return err; @@ -705,7 +694,13 @@ static void gtp_dellink(struct net_device *dev, struct list_head *head) { struct gtp_dev *gtp = netdev_priv(dev); struct pdp_ctx *pctx; - int i; + int i, err; + + err = security_gtp_dev_free(gtp); + if (err < 0) { + pr_err("Failed security_gtp_dev_free() err: %d\n", err); + return; + } for (i = 0; i < gtp->hash_size; i++) hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], hlist_tid) @@ -1076,6 +1071,10 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) goto out_unlock; } + err = security_gtp_dev_cmd(gtp, GTP_CMD_NEWPDP); + if (err < 0) + goto out_unlock; + if (version == GTP_V0) sk = gtp->sk0; else if (version == GTP_V1) @@ -1139,6 +1138,7 @@ static struct pdp_ctx *gtp_find_pdp(struct net *net, struct nlattr *nla[]) static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) { struct pdp_ctx *pctx; + struct gtp_dev *gtp; int err = 0; if (!info->attrs[GTPA_VERSION]) @@ -1152,6 +1152,11 @@ static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info) goto out_unlock; } + gtp = netdev_priv(pctx->dev); + err = security_gtp_dev_cmd(gtp, GTP_CMD_DELPDP); + if (err < 0) + goto out_unlock; + if (pctx->gtp_version == GTP_V0) netdev_dbg(pctx->dev, "GTPv0-U: deleting tunnel id = %llx (pdp %p)\n", pctx->u.v0.tid, pctx); @@ -1208,6 +1213,7 @@ static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) { struct pdp_ctx *pctx = NULL; struct sk_buff *skb2; + struct gtp_dev *gtp; int err; if (!info->attrs[GTPA_VERSION]) @@ -1221,6 +1227,11 @@ static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info) goto err_unlock; } + gtp = netdev_priv(pctx->dev); + err = security_gtp_dev_cmd(gtp, GTP_CMD_GETPDP); + if (err < 0) + goto err_unlock; + skb2 = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); if (skb2 == NULL) { err = -ENOMEM; @@ -1250,6 +1261,7 @@ static int gtp_genl_dump_pdp(struct sk_buff *skb, struct net *net = sock_net(skb->sk); struct pdp_ctx *pctx; struct gtp_net *gn; + int err; gn = net_generic(net, gtp_net_id); @@ -1263,6 +1275,12 @@ static int gtp_genl_dump_pdp(struct sk_buff *skb, else last_gtp = NULL; + err = security_gtp_dev_cmd(gtp, GTP_CMD_GETPDP); + if (err < 0) { + rcu_read_unlock(); + return err; + } + for (i = bucket; i < gtp->hash_size; i++) { j = 0; hlist_for_each_entry_rcu(pctx, >p->tid_hash[i], diff --git a/include/net/gtp.h b/include/net/gtp.h index 0e16ebb2a..84b68cf8d 100644 --- a/include/net/gtp.h +++ b/include/net/gtp.h @@ -32,4 +32,25 @@ struct gtp1_header { /* According to 3GPP TS 29.060. */ #define GTP1_F_EXTHDR 0x04 #define GTP1_F_MASK 0x07 +/* + * One instance of the GTP device. + * Any LSM security module can access their security blob here. + */ +struct gtp_dev { + struct list_head list; + + struct sock *sk0; + struct sock *sk1u; + + struct net_device *dev; + + unsigned int role; + unsigned int hash_size; + struct hlist_head *tid_hash; + struct hlist_head *addr_hash; +#ifdef CONFIG_SECURITY + void *security; +#endif +}; + #endif