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[144.76.156.219]) by smtp.gmail.com with ESMTPSA id o18-20020a5d4092000000b002fe87e0706bsm3027879wrp.97.2023.04.19.10.44.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Apr 2023 10:44:32 -0700 (PDT) From: Matthieu Baerts Date: Wed, 19 Apr 2023 19:44:05 +0200 Subject: [PATCH LSM 2/2] selinux: Implement mptcp_add_subflow hook MIME-Version: 1.0 Message-Id: <20230419-upstream-lsm-next-20230419-mptcp-sublows-user-ctx-v1-2-9d4064cb0075@tessares.net> References: <20230419-upstream-lsm-next-20230419-mptcp-sublows-user-ctx-v1-0-9d4064cb0075@tessares.net> In-Reply-To: <20230419-upstream-lsm-next-20230419-mptcp-sublows-user-ctx-v1-0-9d4064cb0075@tessares.net> To: Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Eric Paris Cc: Paolo Abeni , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Ondrej Mosnacek , mptcp@lists.linux.dev, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, Matthieu Baerts X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2936; i=matthieu.baerts@tessares.net; h=from:subject:message-id; bh=mqr2BGqHqewUUPR1OCVjrPaTiiM4zt6T6l/x3JibBwM=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBkQCh9Ojvp++qr8MSZ7mbE4nq4WiFrlXM05/A7K yVFNIdEH6iJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZEAofQAKCRD2t4JPQmmg c9LJD/4s7Mgv6rEvplVwimrhxteV4tT/cc+JAKks+NedETm2aWSdjhgSwxJaxoS4sdYz4HOu8x6 wG+Gt3I6TOCxlYGI+2AGOpJ7dDN0XJO+hmOsIo7LY+el7LC64eSLZgSeq4kN3pKFT48zS5bdjjE fRMekhhhIp9+foseeTlMcY+Swdghpg2EphVcY4zJSNaJ3rxai900o8F5ey2MTO9VIW98pPhAQ+J aKUOSviER5SnJ+QlTvxXGdlHAr05NpOCv/NzFzpAhDuiEu8fXqO61br7PHDG2wF7CP0bOJ8X1cy uw9PcQhaqPMIo+rZx7QdD9xjPYndmrNS3XX3DmM2fnTkomvg0EJ+givdU8oiYgYY/Bx+0riSGBf k8WJUe23qyfvKoluqcO6KjsgmS7kVU2hYB9jGiGgEWb9FxryGSZMRLn9ysV+Lg0OtO8A0l1RBEx iuCin6uQxQMZsCtUDOsjteDr7lq+DcfgreakHSfRPqvPlcE/gurYM9LGtI9fltkryVy7f6kBHTB cURGSeQDof0R858t1Z5S0AKQ1vmLtHoBMIcKCwwcWlWiSL1xu3ptTFyiuXjNn+y6X0155MvM7WU EXer4DIlV5ZGy4vmWOWUbS2LHdlI+pPnpR6XB1P3SLhnaCaX3SLOVcxcDBzehO0Kg0IvI8/wnHt Iw+9Ay7f8DP3vdg== X-Developer-Key: i=matthieu.baerts@tessares.net; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Paolo Abeni Newly added subflows should inherit the LSM label from the associated msk socket regarless current context. This patch implements the above copying sid and class from the msk context, deleting the existing subflow label, if any, and then re-creating a new one. The new helper reuses the selinux_netlbl_sk_security_free() function, and the latter can end-up being called multiple times with the same argument; we additionally need to make it idempotent. Signed-off-by: Paolo Abeni Acked-by: Matthieu Baerts Signed-off-by: Matthieu Baerts --- security/selinux/hooks.c | 16 ++++++++++++++++ security/selinux/netlabel.c | 8 ++++++-- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 9a5bdfc21314..53cfc1cb67d2 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -5476,6 +5476,21 @@ static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk selinux_netlbl_sctp_sk_clone(sk, newsk); } +static int selinux_mptcp_add_subflow(struct sock *sk, struct sock *ssk) +{ + struct sk_security_struct *ssksec = ssk->sk_security; + struct sk_security_struct *sksec = sk->sk_security; + + ssksec->sclass = sksec->sclass; + ssksec->sid = sksec->sid; + + /* replace the existing subflow label deleting the existing one + * and re-recrating a new label using the current context + */ + selinux_netlbl_sk_security_free(ssksec); + return selinux_netlbl_socket_post_create(ssk, ssk->sk_family); +} + static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb, struct request_sock *req) { @@ -7216,6 +7231,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(sctp_sk_clone, selinux_sctp_sk_clone), LSM_HOOK_INIT(sctp_bind_connect, selinux_sctp_bind_connect), LSM_HOOK_INIT(sctp_assoc_established, selinux_sctp_assoc_established), + LSM_HOOK_INIT(mptcp_add_subflow, selinux_mptcp_add_subflow), LSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request), LSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone), LSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established), diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c index 1321f15799e2..33187e38def7 100644 --- a/security/selinux/netlabel.c +++ b/security/selinux/netlabel.c @@ -155,8 +155,12 @@ void selinux_netlbl_err(struct sk_buff *skb, u16 family, int error, int gateway) */ void selinux_netlbl_sk_security_free(struct sk_security_struct *sksec) { - if (sksec->nlbl_secattr != NULL) - netlbl_secattr_free(sksec->nlbl_secattr); + if (!sksec->nlbl_secattr) + return; + + netlbl_secattr_free(sksec->nlbl_secattr); + sksec->nlbl_secattr = NULL; + sksec->nlbl_state = NLBL_UNSET; } /**