** Description changed:
[Impact]
When snap-confine itself is invoked over an SSH connection, with ssh
using non-standard Apparmor confinement, snap-confine would fail.
This change was introduced by a member of the security team who is using
this non-standard configuration.
[Test Case]
- TBD
+ Ensure that the policy compiles and does not regress using snaps over ssh. Eg:
+ $ ssh foo
+ $ sudo snap install hello-world
+ $ hello-world
[Regression Potential]
* Minimal, snap-confine has a more permissive apparmor profile that
allows it to access /dev/pts/[0-9]* for both reading and writing.
[Other Info]
* This bug is a part of a major SRU that brings snap-confine in Ubuntu
16.04 in line with the current upstream release 1.0.41.
* snap-confine is technically an integral part of snapd which has an SRU
exception and is allowed to introduce new features and take advantage of
accelerated procedure. For more information see
https://wiki.ubuntu.com/SnapdUpdates
== # Pre-SRU bug description follows # ==
Logging into an Ubuntu 16.04 machine that has a confined sshd and
running 'hello-world', I see this denial:
kernel: [180734.692698] audit: type=1400 audit(1473365455.056:98):
apparmor="DENIED" operation="file_inherit" profile="/usr/lib/snapd/snap-
confine" name="/dev/pts/2" pid=28375 comm="ubuntu-core-lau"
requested_mask="wr" denied_mask="wr" fsuid=1000 ouid=1000
What is happening is that the fd is being remediated since it is not
coming from an unconfined process. Fix is:
/dev/pts/[0-9]* rw,
** Description changed:
[Impact]
- When snap-confine itself is invoked over an SSH connection, with ssh
- using non-standard Apparmor confinement, snap-confine would fail.
+ When snap-confine itself is invoked over an SSH connection, with sshd
+ using non-standard Apparmor confinement with pam-apparmor, snap-confine
+ would fail.
This change was introduced by a member of the security team who is using
this non-standard configuration.
[Test Case]
Ensure that the policy compiles and does not regress using snaps over ssh. Eg:
$ ssh foo
$ sudo snap install hello-world
$ hello-world
[Regression Potential]
* Minimal, snap-confine has a more permissive apparmor profile that
allows it to access /dev/pts/[0-9]* for both reading and writing.
[Other Info]
* This bug is a part of a major SRU that brings snap-confine in Ubuntu
16.04 in line with the current upstream release 1.0.41.
* snap-confine is technically an integral part of snapd which has an SRU
exception and is allowed to introduce new features and take advantage of
accelerated procedure. For more information see
https://wiki.ubuntu.com/SnapdUpdates
== # Pre-SRU bug description follows # ==
Logging into an Ubuntu 16.04 machine that has a confined sshd and
running 'hello-world', I see this denial:
kernel: [180734.692698] audit: type=1400 audit(1473365455.056:98):
apparmor="DENIED" operation="file_inherit" profile="/usr/lib/snapd/snap-
confine" name="/dev/pts/2" pid=28375 comm="ubuntu-core-lau"
requested_mask="wr" denied_mask="wr" fsuid=1000 ouid=1000
What is happening is that the fd is being remediated since it is not
coming from an unconfined process. Fix is:
/dev/pts/[0-9]* rw,
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https://bugs.launchpad.net/bugs/1621624
Title:
/dev/pts/# denial when running snap-confine under sshd configured for
pam-apparmor
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