We cannot re-exec into a new user namespace to gain privileges and
access an existing as the new namespace is not the owner of the
existing container.
"unshare" is used to join the user namespace of the target container.
The current implementation assumes that the main process of the
container didn't create a new user namespace.
Since in the setup phase we are not running with euid=0, we must skip
the setup for containers/storage.
Closes: https://github.com/containers/libpod/issues/1329
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1331
Approved by: rhatdan
Lookup the current username by UID if the USER env variable is not
set.
Reported in: https://github.com/projectatomic/libpod/issues/1092
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1217
Approved by: rhatdan
It is required only when directly configuring the user namespace.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1200
Approved by: rhatdan
Most images won't work without multiple ids/gids. Error out
immediately if there are no multiple ids available.
The error code when the user is not present in /etc/sub{g,u}id looks
like:
$ bin/podman run --rm -ti alpine echo hello
ERRO[0000] No subuid ranges found for user "gscrivano"
Closes: https://github.com/projectatomic/libpod/issues/1087
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1097
Approved by: rhatdan
The files were split apart by b96be3af (changes to allow for darwin
compilation, 2018-06-20, #1015), but the C import and two functions
left in rootless.go are all Linux-specific as well. This commit moves
all of the pre-b96be3af rootless.go into rootless_linux.go, just
adding the '// +build linux' header (b96be3af also scrambled the + in
that header) and keeping the new GetRootlessUID from a1545fe6
(rootless: add function to retrieve the original UID, 2018-07-05, #1048).
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #1034
Approved by: baude
After we re-exec in the userNS os.Getuid() returns the new UID (= 0)
which is not what we want to use.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Closes: #1048
Approved by: mheon
Giuseppe Scrivano
W. Trevor King
baude