From: Casey Schaufler <casey@schaufler-ca.com> To: James Morris <jmorris@namei.org>, "Eric W. Biederman" <ebiederm@xmission.com> Cc: yangshukui <yangshukui@huawei.com>, selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org, Lizefan <lizefan@huawei.com>, paul@paul-moore.com, sds@tycho.nsa.gov, eparis@parisplace.org, james.l.morris@oracle.com, oleg@redhat.com, serge.hallyn@ubuntu.com Subject: Re: isolate selinux_enforcing Date: Mon, 13 Mar 2017 09:05:38 -0700 [thread overview] Message-ID: <64e2a668-00ef-e095-e2f9-bf100ac6dd35@schaufler-ca.com> (raw) In-Reply-To: <alpine.LRH.2.20.1703131704400.3299@namei.org> On 3/13/2017 12:06 AM, James Morris wrote: > On Thu, 9 Mar 2017, Eric W. Biederman wrote: > >> My expectation is that a container would run as essentially all one >> label from a global perspective. >> > Keep in mind that a different classes of objects may have distinct > labeling in SELinux. e.g. a process and a file typically have different > labels (say, sshd_t vs. sshd_key_t). > > Also, I think you will want to have the global namespace always use the > original security labels. If accessing an object from outside the > container, the original global policy should always apply. Really, this > needs to be an invariant property. > > I'd suggest implementing an orthogonal 2nd set of security labels which > are only ever used within the container. The work that's been done for Smack namespaces https://lwn.net/Articles/652320 may come in handy during during your deliberations for SELinux. Conceptually you can create aliases for your base labels, and use those within the container. Very much like the UID mapping of user namespaces. Labels that don't have an alias can't be accessed within the namespace. >> To implement this would require a revision on the selinux labels xattrs >> so that they can be marked as being part of a container... But having >> the labels look ordinary inside the container. >> >> We almost have a patch that implements something like that for the >> capability xattr. > It'll be interesting to see. >
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From: casey@schaufler-ca.com (Casey Schaufler) To: linux-security-module@vger.kernel.org Subject: isolate selinux_enforcing Date: Mon, 13 Mar 2017 09:05:38 -0700 [thread overview] Message-ID: <64e2a668-00ef-e095-e2f9-bf100ac6dd35@schaufler-ca.com> (raw) In-Reply-To: <alpine.LRH.2.20.1703131704400.3299@namei.org> On 3/13/2017 12:06 AM, James Morris wrote: > On Thu, 9 Mar 2017, Eric W. Biederman wrote: > >> My expectation is that a container would run as essentially all one >> label from a global perspective. >> > Keep in mind that a different classes of objects may have distinct > labeling in SELinux. e.g. a process and a file typically have different > labels (say, sshd_t vs. sshd_key_t). > > Also, I think you will want to have the global namespace always use the > original security labels. If accessing an object from outside the > container, the original global policy should always apply. Really, this > needs to be an invariant property. > > I'd suggest implementing an orthogonal 2nd set of security labels which > are only ever used within the container. The work that's been done for Smack namespaces https://lwn.net/Articles/652320 may come in handy during during your deliberations for SELinux. Conceptually you can create aliases for your base labels, and use those within the container. Very much like the UID mapping of user namespaces. Labels that don't have an alias can't be accessed within the namespace. >> To implement this would require a revision on the selinux labels xattrs >> so that they can be marked as being part of a container... But having >> the labels look ordinary inside the container. >> >> We almost have a patch that implements something like that for the >> capability xattr. > It'll be interesting to see. > -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2017-03-13 16:06 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <58732BCF.4090908@huawei.com> [not found] ` <58734284.1060504@huawei.com> [not found] ` <b7f75f65-592a-5102-0ac5-4d3aa43f0b55@huawei.com> 2017-01-09 10:51 ` SELinux lead to soft lockup when pid 1 proceess reap child yangshukui 2017-01-09 18:12 ` Oleg Nesterov 2017-01-09 18:29 ` Oleg Nesterov 2017-01-09 18:43 ` Stephen Smalley 2017-01-09 23:49 ` Paul Moore 2017-01-10 0:26 ` Casey Schaufler 2017-03-09 9:03 ` isolate selinux_enforcing yangshukui 2017-03-09 9:03 ` yangshukui 2017-03-09 15:28 ` Stephen Smalley 2017-03-09 15:28 ` Stephen Smalley 2017-03-09 15:39 ` Stephen Smalley 2017-03-09 15:39 ` Stephen Smalley 2017-03-09 16:39 ` Casey Schaufler 2017-03-09 16:39 ` Casey Schaufler 2017-03-09 20:49 ` Eric W. Biederman 2017-03-09 20:49 ` Eric W. Biederman 2017-03-10 0:05 ` Paul Moore 2017-03-10 0:05 ` Paul Moore 2017-03-13 7:06 ` James Morris 2017-03-13 7:06 ` James Morris 2017-03-13 16:05 ` Casey Schaufler [this message] 2017-03-13 16:05 ` Casey Schaufler
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