create the /etc/passwd and /etc/group files before any user/group
lookup so that the entries added dynamically are found by --user.
As a side effect, do not automatically create the group with same
value as the uid when not specified, since it is expected to run with
gid=0.
Closes: https://github.com/containers/podman/issues/25805
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
The tests for generating username/passwd entries assume that
UID/GID 123/456 do not exist, which is not a safe assumption on
Debian. If a /etc/passwd entry with that UID/GID already exists,
the test will not add a new one with the same UID/GID, and will
fail. Change UID and GID to be 6 digits, because we're a lot less
likely to collide with UIDs and GIDs in use on the system that
way. Could also go further and randomly generate the UID/GID, but
that feels like overkill.
Fixes#17366
Signed-off-by: Matt Heon <mheon@redhat.com>
This commit replaces `ioutil.TempDir` with `t.TempDir` in tests. The
directory created by `t.TempDir` is automatically removed when the test
and all its subtests complete.
Prior to this commit, temporary directory created using `ioutil.TempDir`
needs to be removed manually by calling `os.RemoveAll`, which is omitted
in some tests. The error handling boilerplate e.g.
defer func() {
if err := os.RemoveAll(dir); err != nil {
t.Fatal(err)
}
}
is also tedious, but `t.TempDir` handles this for us nicely.
Reference: https://pkg.go.dev/testing#T.TempDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Use the new logic from c/common to create the hosts file. This will help
to better allign the hosts files between buildah and podman.
Also this fixes several bugs:
- remove host entries when container is stopped and has a netNsCtr
- add entries for containers in a pod
- do not duplicate entries in the hosts file
- use the correct slirp ip when an userns is used
Features:
- configure host.containers.internal entry in containers.conf
- configure base hosts file in containers.conf
Fixes#12003Fixes#13224
Signed-off-by: Paul Holzinger <pholzing@redhat.com>
To ensure that the user running in the container ahs a valid
entry in /etc/passwd so lookup functions for the current user
will not error, Podman previously began adding entries to the
passwd file. We did not, however, add entries to the group file,
and this created problems - our passwd entries included the group
the user is in, but said group might not exist. The solution is
to mirror our logic for /etc/passwd modifications to also edit
/etc/group in the container.
Unfortunately, this is not a catch-all solution. Our logic here
is only advanced enough to *add* to the group file - so if the
group already exists but we add a user not a part of it, we will
not modify that existing entry, and things remain inconsistent.
We can look into adding this later if we absolutely need to, but
it would involve adding significant complexity to this already
massively complicated function.
While we're here, address an edge case where Podman could add a
user or group whose UID overlapped with an existing user or
group.
Also, let's make users able to log into users we added. Instead
of generating user entries with an 'x' in the password field,
indicating they have an entry in /etc/shadow, generate a '*'
indicating the user has no password but can be logged into by
other means e.g. ssh key, su.
Fixes#7503Fixes#7389Fixes#7499
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
If I enter a continer with --userns keep-id, my UID will be present
inside of the container, but most likely my user will not be defined.
This patch will take information about the user and stick it into the
container.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
