[{"id":1863008,"web_url":"http://patchwork.ozlabs.org/comment/1863008/","msgid":"<20180223215248.GA20989@roeck-us.net>","list_archive_url":null,"date":"2018-02-23T21:52:48","subject":"Re: [v3,net-next,2/2] tls: Use correct sk->sk_prot for IPV6","submitter":{"id":21889,"url":"http://patchwork.ozlabs.org/api/people/21889/","name":"Guenter Roeck","email":"linux@roeck-us.net"},"content":"Hi Ilya,\n\nOn Mon, Sep 04, 2017 at 01:14:01PM +0300, Ilya Lesokhin wrote:\n> The tls ulp overrides sk->prot with a new tls specific proto structs.\n> The tls specific structs were previously based on the ipv4 specific\n> tcp_prot sturct.\n> As a result, attaching the tls ulp to an ipv6 tcp socket replaced\n> some ipv6 callback with the ipv4 equivalents.\n> \n> This patch adds ipv6 tls proto structs and uses them when\n> attached to ipv6 sockets.\n> \n\nDo you plan to update this patch with the missing TCPv6 support ?\nAs far as I can see, the part that was accepted upstream does not fix\nthe TCPv6 protocol issue which triggers CVE-2018-5703.\n\nIf adding IPv6 support is not possible/acceptable, would it make sense\nto limit TLS support to TCPv4, ie add something like\n\n\tif (sk->sk_prot != &tcp_prot)\n\t\treturn -EINVAL;\n\nto tls_init() ?\n\nThanks,\nGuenter\n\n> Fixes: 3c4d7559159b ('tls: kernel TLS support')\n> Signed-off-by: Boris Pismenny \n> Signed-off-by: Ilya Lesokhin \n> ---\n> net/tls/Kconfig | 1 +\n> net/tls/tls_main.c | 50 ++++++++++++++++++++++++++++++++++++++------------\n> 2 files changed, 39 insertions(+), 12 deletions(-)\n> \n> diff --git a/net/tls/Kconfig b/net/tls/Kconfig\n> index eb58303..7e9cf8b 100644\n> --- a/net/tls/Kconfig\n> +++ b/net/tls/Kconfig\n> @@ -7,6 +7,7 @@ config TLS\n> \tselect CRYPTO\n> \tselect CRYPTO_AES\n> \tselect CRYPTO_GCM\n> +\tselect IPV6\n> \tdefault n\n> \t---help---\n> \tEnable kernel support for TLS protocol. This allows symmetric\n> diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c\n> index 60aff60..33c499e 100644\n> --- a/net/tls/tls_main.c\n> +++ b/net/tls/tls_main.c\n> @@ -40,13 +40,25 @@\n> #include \n> \n> #include \n> +#include \n> \n> MODULE_AUTHOR(\"Mellanox Technologies\");\n> MODULE_DESCRIPTION(\"Transport Layer Security Support\");\n> MODULE_LICENSE(\"Dual BSD/GPL\");\n> \n> -static struct proto tls_base_prot;\n> -static struct proto tls_sw_prot;\n> +enum {\n> +\tTLSV4,\n> +\tTLSV6,\n> +\tTLS_NUM_PROTS,\n> +};\n> +\n> +enum {\n> +\tTLS_BASE_TX,\n> +\tTLS_SW_TX,\n> +\tTLS_NUM_CONFIG,\n> +};\n> +\n> +static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG];\n> \n> int wait_on_pending_writer(struct sock *sk, long *timeo)\n> {\n> @@ -342,6 +354,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,\n> \tstruct tls_context *ctx = tls_get_ctx(sk);\n> \tstruct proto *prot = NULL;\n> \tint rc = 0;\n> +\tint ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;\n> \n> \tif (!optval || (optlen < sizeof(*crypto_info))) {\n> \t\trc = -EINVAL;\n> @@ -396,7 +409,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,\n> \n> \t/* currently SW is default, we will have ethtool in future */\n> \trc = tls_set_sw_offload(sk, ctx);\n> -\tprot = &tls_sw_prot;\n> +\tprot = &tls_prots[ip_ver][TLS_SW_TX];\n> \tif (rc)\n> \t\tgoto err_crypto_info;\n> \n> @@ -443,6 +456,12 @@ static int tls_init(struct sock *sk)\n> \tstruct inet_connection_sock *icsk = inet_csk(sk);\n> \tstruct tls_context *ctx;\n> \tint rc = 0;\n> +\tint ip_ver = TLSV4;\n> +\n> +\tif (sk->sk_prot == &tcpv6_prot)\n> +\t\tip_ver = TLSV6;\n> +\telse if (sk->sk_prot != &tcp_prot)\n> +\t\treturn -EINVAL;\n> \n> \t/* allocate tls context */\n> \tctx = kzalloc(sizeof(*ctx), GFP_KERNEL);\n> @@ -453,7 +472,8 @@ static int tls_init(struct sock *sk)\n> \ticsk->icsk_ulp_data = ctx;\n> \tctx->setsockopt = sk->sk_prot->setsockopt;\n> \tctx->getsockopt = sk->sk_prot->getsockopt;\n> -\tsk->sk_prot = &tls_base_prot;\n> +\n> +\tsk->sk_prot = &tls_prots[ip_ver][TLS_BASE_TX];\n> out:\n> \treturn rc;\n> }\n> @@ -464,16 +484,22 @@ static int tls_init(struct sock *sk)\n> \t.init\t\t\t= tls_init,\n> };\n> \n> +static void build_protos(struct proto *prot, struct proto *base)\n> +{\n> +\tprot[TLS_BASE_TX] = *base;\n> +\tprot[TLS_BASE_TX].setsockopt = tls_setsockopt;\n> +\tprot[TLS_BASE_TX].getsockopt = tls_getsockopt;\n> +\n> +\tprot[TLS_SW_TX] = prot[TLS_BASE_TX];\n> +\tprot[TLS_SW_TX].close\t\t= tls_sk_proto_close;\n> +\tprot[TLS_SW_TX].sendmsg\t\t= tls_sw_sendmsg;\n> +\tprot[TLS_SW_TX].sendpage\t= tls_sw_sendpage;\n> +}\n> +\n> static int __init tls_register(void)\n> {\n> -\ttls_base_prot\t\t\t= tcp_prot;\n> -\ttls_base_prot.setsockopt\t= tls_setsockopt;\n> -\ttls_base_prot.getsockopt\t= tls_getsockopt;\n> -\n> -\ttls_sw_prot\t\t\t= tls_base_prot;\n> -\ttls_sw_prot.sendmsg\t\t= tls_sw_sendmsg;\n> -\ttls_sw_prot.sendpage = tls_sw_sendpage;\n> -\ttls_sw_prot.close = tls_sk_proto_close;\n> +\tbuild_protos(tls_prots[TLSV4], &tcp_prot);\n> +\tbuild_protos(tls_prots[TLSV6], &tcpv6_prot);\n> \n> \ttcp_register_ulp(&tcp_tls_ulp_ops);\n>","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; 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charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<1504520041-55634-3-git-send-email-ilyal@mellanox.com>","User-Agent":"Mutt/1.5.24 (2015-08-30)","Sender":"netdev-owner@vger.kernel.org","Precedence":"bulk","List-ID":"","X-Mailing-List":"netdev@vger.kernel.org"}},{"id":1864538,"web_url":"http://patchwork.ozlabs.org/comment/1864538/","msgid":"<8310f232-4a7b-8bf0-7589-ffc4c300d8d6@mellanox.com>","list_archive_url":null,"date":"2018-02-27T07:49:36","subject":"Re: [v3,net-next,2/2] tls: Use correct sk->sk_prot for IPV6","submitter":{"id":68344,"url":"http://patchwork.ozlabs.org/api/people/68344/","name":"Boris Pismenny","email":"borisp@mellanox.com"},"content":"Hi Guenter,\n\nOn 2/23/2018 11:52 PM, Guenter Roeck wrote:\n> Hi Ilya,\n> \n> On Mon, Sep 04, 2017 at 01:14:01PM +0300, Ilya Lesokhin wrote:\n>> The tls ulp overrides sk->prot with a new tls specific proto structs.\n>> The tls specific structs were previously based on the ipv4 specific\n>> tcp_prot sturct.\n>> As a result, attaching the tls ulp to an ipv6 tcp socket replaced\n>> some ipv6 callback with the ipv4 equivalents.\n>>\n>> This patch adds ipv6 tls proto structs and uses them when\n>> attached to ipv6 sockets.\n>>\n> \n> Do you plan to update this patch with the missing TCPv6 support ?\n\nWe'll re-spin a v4 by EOW.\n\n> As far as I can see, the part that was accepted upstream does not fix\n> the TCPv6 protocol issue which triggers CVE-2018-5703.\n> \n> If adding IPv6 support is not possible/acceptable, would it make sense\n> to limit TLS support to TCPv4, ie add something like\n> \n> \tif (sk->sk_prot != &tcp_prot)\n> \t\treturn -EINVAL;\n> \n> to tls_init() ?\n\nAFAIK there are users of TLS over IPv6 who wouldn't find this acceptable.\n\nBest,\nBoris.","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; 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