From: ebiederm@xmission.com (Eric W. Biederman) To: Casey Schaufler <casey@schaufler-ca.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: Thu, 09 Mar 2017 14:49:43 -0600 [thread overview] Message-ID: <87innidvko.fsf@xmission.com> (raw) In-Reply-To: <347f63b5-c274-c7bc-55f7-f6304d31418a@schaufler-ca.com> (Casey Schaufler's message of "Thu, 9 Mar 2017 08:39:10 -0800") Casey Schaufler <casey@schaufler-ca.com> writes: > On 3/9/2017 1:03 AM, yangshukui wrote: >> I want to use SELinux in system container and only concern the function in the container. >> this system container run in vm and every vm has only one system container. >> >> How do I use now? >> docker run ... system-contaier /sbin/init >> after init is running ,the following service is also running: >> >> #this is the part of service file which will run in container after starting the container. >> .. >> semodule -R #use the policy in container. >> restorecon / #if needed >> .. >> >> this method seem to work if host os and the docker images use the same content for rootfs, but if host use >> redhat7 and docker images use centos7, it will deny many normal operations , and this let some host service not work. >> >> If SELinux is permissive in host and enforcing in container ,it will resolve my problem. Unfortunately, >> there is no namespace for SELinux. This is mostly a SELinux problem. > The LSM infrastructure is essentially a set of lists. > These lists are rooted globally, but there's no reason* > they couldn't be rooted in a namespace. That would give > each namespace the option of using whatever security > scheme was deemed appropriate. There are a number of > issues, such as namespacing policy, that would have to > be addressed, but the mechanism could work fine. I would > look at patches. > > --- > * Other than the sheer insanity of making security > claims about such a system. I would not expect that > minor issue to slow demand or deployment any more > than it has in the past. I would tend to insist that the container local policy stacks inside the global policy. So that at the least the global security claims would not be reduced. My expectation is that a container would run as essentially all one label from a global perspective. 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. Eric
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From: ebiederm@xmission.com (Eric W. Biederman) To: linux-security-module@vger.kernel.org Subject: isolate selinux_enforcing Date: Thu, 09 Mar 2017 14:49:43 -0600 [thread overview] Message-ID: <87innidvko.fsf@xmission.com> (raw) In-Reply-To: <347f63b5-c274-c7bc-55f7-f6304d31418a@schaufler-ca.com> (Casey Schaufler's message of "Thu, 9 Mar 2017 08:39:10 -0800") Casey Schaufler <casey@schaufler-ca.com> writes: > On 3/9/2017 1:03 AM, yangshukui wrote: >> I want to use SELinux in system container and only concern the function in the container. >> this system container run in vm and every vm has only one system container. >> >> How do I use now? >> docker run ... system-contaier /sbin/init >> after init is running ,the following service is also running: >> >> #this is the part of service file which will run in container after starting the container. >> .. >> semodule -R #use the policy in container. >> restorecon / #if needed >> .. >> >> this method seem to work if host os and the docker images use the same content for rootfs, but if host use >> redhat7 and docker images use centos7, it will deny many normal operations , and this let some host service not work. >> >> If SELinux is permissive in host and enforcing in container ,it will resolve my problem. Unfortunately, >> there is no namespace for SELinux. This is mostly a SELinux problem. > The LSM infrastructure is essentially a set of lists. > These lists are rooted globally, but there's no reason* > they couldn't be rooted in a namespace. That would give > each namespace the option of using whatever security > scheme was deemed appropriate. There are a number of > issues, such as namespacing policy, that would have to > be addressed, but the mechanism could work fine. I would > look at patches. > > --- > * Other than the sheer insanity of making security > claims about such a system. I would not expect that > minor issue to slow demand or deployment any more > than it has in the past. I would tend to insist that the container local policy stacks inside the global policy. So that at the least the global security claims would not be reduced. My expectation is that a container would run as essentially all one label from a global perspective. 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. Eric -- 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:[~2017-03-09 20:49 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 [this message] 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 2017-03-13 16:05 ` Casey Schaufler
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