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(static-72-81-132-2.bltmmd.fios.verizon.net [72.81.132.2]) by mx.zohomail.com with SMTPS id 1651576668065384.3787219888786; Tue, 3 May 2022 04:17:48 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: d2730006-cad2-11ec-8fc4-03012f2f19d4 ARC-Seal: i=1; a=rsa-sha256; t=1651576669; cv=none; d=zohomail.com; s=zohoarc; b=JJKOcvVdOwQS1pxmXpLQvNqeO6TYNQd3WQq/oka+M0XDcaEgfHuTdazTFxC8uIxYFXH/DNHFx/ucW/6nFTqs0zrca0Mfir8GLPtgtCMjdaj3HdagRqIPAnpO+CN30FNYCypzjFyCkl4i6tF2ydxTkFIFvgijvdAIxe0vrpAFY4w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1651576669; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=Rn8pIJ5/E/d7mP3iWH7p9KqhjeTfcKsV2dbiWGsA9xU=; b=drY5Qa0hxPVoMWUXPs5Uxbnx97yU2hSMvDHWga62lN3KUDzSeBIyUAii4M1IMTeAlyWtGkhz3W5qaJ3ZSzLjQd9EoBgq0AjdFYz8YM3rYGlSdbY+OwE7NP+TYlCCQWimqKQSKeocaMvOng+npS74KZBWjxvrmDD6HPpdO6ndsGI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=apertussolutions.com; spf=pass smtp.mailfrom=dpsmith@apertussolutions.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1651576669; s=zoho; d=apertussolutions.com; i=dpsmith@apertussolutions.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=Rn8pIJ5/E/d7mP3iWH7p9KqhjeTfcKsV2dbiWGsA9xU=; b=MHF5gDLgRXZ3HxxgnQlW4GIcm9QG/sWt2Zcuf3cGbXNJgadnTkAni/OVPBJQcRkl CCN1OwQ07j3J7atN8PuIihA/NVJEeut/e1bRFDupLUgjpEz+EBu4dojrDpa+4oDtzdR FKl7Ysa/4pOESghTf4OyrrMuIQmJRKqSDQ54TG4c= From: "Daniel P. Smith" To: xen-devel@lists.xenproject.org, "Daniel P. Smith" Cc: scott.davis@starlab.io, jandryuk@gmail.com, christopher.clark@starlab.io, Daniel De Graaf , Wei Liu , Anthony PERARD Subject: [PATCH v6 2/2] flask: implement xsm_set_system_active Date: Tue, 3 May 2022 07:17:31 -0400 Message-Id: <20220503111731.12642-3-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220503111731.12642-1-dpsmith@apertussolutions.com> References: <20220503111731.12642-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 X-ZohoMailClient: External This commit implements full support for starting the idle domain privileged by introducing a new flask label xenboot_t which the idle domain is labeled with at creation. It then provides the implementation for the XSM hook xsm_set_system_active to relabel the idle domain to the existing xen_t flask label. In the reference flask policy a new macro, xen_build_domain(target), is introduced for creating policies for dom0less/hyperlaunch allowing the hypervisor to create and assign the necessary resources for domain construction. Signed-off-by: Daniel P. Smith Reviewed-by: Jason Andryuk Reviewed-by: Luca Fancellu Tested-by: Luca Fancellu --- tools/flask/policy/modules/xen.if | 6 ++++++ tools/flask/policy/modules/xen.te | 1 + tools/flask/policy/policy/initial_sids | 1 + xen/xsm/flask/hooks.c | 9 ++++++++- xen/xsm/flask/policy/initial_sids | 1 + 5 files changed, 17 insertions(+), 1 deletion(-) diff --git a/tools/flask/policy/modules/xen.if b/tools/flask/policy/modules/xen.if index 5e2aa472b6..4ec676fff1 100644 --- a/tools/flask/policy/modules/xen.if +++ b/tools/flask/policy/modules/xen.if @@ -62,6 +62,12 @@ define(`create_domain_common', ` setparam altp2mhvm altp2mhvm_op dm }; ') +# xen_build_domain(target) +# Allow a domain to be created at boot by the hypervisor +define(`xen_build_domain', ` + allow xenboot_t $1_channel:event create; +') + # create_domain(priv, target) # Allow a domain to be created directly define(`create_domain', ` diff --git a/tools/flask/policy/modules/xen.te b/tools/flask/policy/modules/xen.te index 3dbf93d2b8..de98206fdd 100644 --- a/tools/flask/policy/modules/xen.te +++ b/tools/flask/policy/modules/xen.te @@ -24,6 +24,7 @@ attribute mls_priv; ################################################################################ # The hypervisor itself +type xenboot_t, xen_type, mls_priv; type xen_t, xen_type, mls_priv; # Domain 0 diff --git a/tools/flask/policy/policy/initial_sids b/tools/flask/policy/policy/initial_sids index 6b7b7eff21..ec729d3ba3 100644 --- a/tools/flask/policy/policy/initial_sids +++ b/tools/flask/policy/policy/initial_sids @@ -2,6 +2,7 @@ # objects created before the policy is loaded or for objects that do not have a # label defined in some other manner. +sid xenboot gen_context(system_u:system_r:xenboot_t,s0) sid xen gen_context(system_u:system_r:xen_t,s0) sid dom0 gen_context(system_u:system_r:dom0_t,s0) sid domxen gen_context(system_u:system_r:domxen_t,s0) diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c index b93101191e..734d9de16a 100644 --- a/xen/xsm/flask/hooks.c +++ b/xen/xsm/flask/hooks.c @@ -168,7 +168,7 @@ static int cf_check flask_domain_alloc_security(struct domain *d) switch ( d->domain_id ) { case DOMID_IDLE: - dsec->sid = SECINITSID_XEN; + dsec->sid = SECINITSID_XENBOOT; break; case DOMID_XEN: dsec->sid = SECINITSID_DOMXEN; @@ -188,9 +188,14 @@ static int cf_check flask_domain_alloc_security(struct domain *d) static int cf_check flask_set_system_active(void) { + struct domain_security_struct *dsec; struct domain *d = current->domain; + dsec = d->ssid; + ASSERT(d->is_privileged); + ASSERT(dsec->sid == SECINITSID_XENBOOT); + ASSERT(dsec->self_sid == SECINITSID_XENBOOT); if ( d->domain_id != DOMID_IDLE ) { @@ -205,6 +210,8 @@ static int cf_check flask_set_system_active(void) */ d->is_privileged = false; + dsec->self_sid = dsec->sid = SECINITSID_XEN; + return 0; } diff --git a/xen/xsm/flask/policy/initial_sids b/xen/xsm/flask/policy/initial_sids index 7eca70d339..e8b55b8368 100644 --- a/xen/xsm/flask/policy/initial_sids +++ b/xen/xsm/flask/policy/initial_sids @@ -3,6 +3,7 @@ # # Define initial security identifiers # +sid xenboot sid xen sid dom0 sid domio