SELinux-Refpolicy Archive on lore.kernel.org
 help / color / Atom feed
From: Dominick Grift <dac.override@gmail.com>
To: Alexander Miroshnichenko <alex@millerson.name>,
	selinux-refpolicy@vger.kernel.org
Subject: Re: [PATCH v2 2/2] ssh: Add interface ssh_search_dir
Date: Thu, 20 Jun 2019 17:40:21 +0200
Message-ID: <20190620154021.GE2647@brutus.lan> (raw)
In-Reply-To: <20190620152731.GD2647@brutus.lan>

[-- Attachment #1: Type: text/plain, Size: 3225 bytes --]

On Thu, Jun 20, 2019 at 05:27:31PM +0200, Dominick Grift wrote:
> On Thu, Jun 20, 2019 at 06:05:57PM +0300, Alexander Miroshnichenko wrote:
> > On четверг, 20 июня 2019 г. 17:50:11 MSK, Dominick Grift wrote:
> > > On Thu, Jun 20, 2019 at 05:41:38PM +0300, Alexander Miroshnichenko wrote:
> > > > Create interface ssh_search_dir to allow ssh_server search for keys
> > > > in non-standard location.
> > > > 
> > > > Signed-off-by: Alexander Miroshnichenko <alex@millerson.name>
> > > > ---
> > > >  policy/modules/services/ssh.if | 18 ++++++++++++++++++
> > > >  1 file changed, 18 insertions(+)
> > > > 
> > > > diff --git a/policy/modules/services/ssh.if
> > > > b/policy/modules/services/ssh.if
> > > > index 0941f133711e..51c64ded00c4 100644
> > > > --- a/policy/modules/services/ssh.if
> > > > +++ b/policy/modules/services/ssh.if
> > > > @@ -680,6 +680,24 @@ interface(`ssh_agent_exec',`
> > > >  	can_exec($1, ssh_agent_exec_t)
> > > >  ')
> > > > +########################################
> > > > +## <summary>
> > > > +##      Search for keys in non-standard location
> > > > +## </summary>
> > > > +## <param name="domain">
> > > > +##      <summary>
> > > > +##      Domain allowed access.
> > > > +##      </summary>
> > > > +## </param>
> > > > +#
> > > > +interface(`ssh_search_dir',`
> > > > +        gen_require(`
> > > > +                type sshd_t;
> > > > +        ')
> > > > +
> > > > +	allow sshd_t $1:dir search_dir_perms;
> > > 
> > > This is generally not allowed. The caller should generally be the source.
> > > Regardless of the above. Keys should be in user home directories. I
> > > wonder what specific scenario prompted you to propose this interface?
> > 
> > GIT hosting software like gitolite/gitosis/gitea manage users ssh keys and
> > store them own location like /var/lib/gitolite/.ssh . /var/lib/gitolite have
> > gitosis_var_lib_t type, /var/lib/gitolite/.ssh have gitosis_ssh_home_t type
> > (in patched policy which I want to submit).
> > If sshd does not have { search getattr } permissions to full path to ssh key
> > user fail to login.
> > Can you propose corret way to give such permissions to multiple policies?
> > It is incorrect to label /var/lib/gitolite as user_home_dir_t type, IMHO.
> 
> Yes this sucks. I would probably do the following instead:
> 
> 1. echo "ignoredirs=/var/lib/gitolite" >> /etc/selinux/semanage.conf
> 2. semodule -B && restorecon -RvF /var/lib/gitolite
> 3. gitosis_read_lib_files(sshd_t)
> 
> Dont bother with labeling /var/lib/gitolite/.ssh differently

But this is just what I would do (if were ever forced to use gitolite). Others may have different opinions.

> 
> > 
> > > > +')
> > > > +
> > > >  ########################################
> > > >  ## <summary>
> > > >  ##	Read ssh home directory content ...
> > > 
> > 
> 
> -- 
> Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02
> https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02
> Dominick Grift



-- 
Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02
https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02
Dominick Grift

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 659 bytes --]

      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 14:41 [PATCH v2 0/2] ssh policy new interfaces Alexander Miroshnichenko
2019-06-20 14:41 ` [PATCH v2 1/2] ssh: Add ssh_exec_keygen interface Alexander Miroshnichenko
2019-06-20 14:46   ` Dominick Grift
2019-06-20 14:41 ` [PATCH v2 2/2] ssh: Add interface ssh_search_dir Alexander Miroshnichenko
2019-06-20 14:50   ` Dominick Grift
2019-06-20 15:05     ` Alexander Miroshnichenko
2019-06-20 15:27       ` Dominick Grift
2019-06-20 15:38         ` Alexander Miroshnichenko
2019-06-20 15:50           ` Dominick Grift
2019-06-20 15:40         ` Dominick Grift [this message]

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190620154021.GE2647@brutus.lan \
    --to=dac.override@gmail.com \
    --cc=alex@millerson.name \
    --cc=selinux-refpolicy@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

SELinux-Refpolicy Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/selinux-refpolicy/0 selinux-refpolicy/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 selinux-refpolicy selinux-refpolicy/ https://lore.kernel.org/selinux-refpolicy \
		selinux-refpolicy@vger.kernel.org
	public-inbox-index selinux-refpolicy

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.selinux-refpolicy


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git