[pve-devel] [PATCH container] fix #5194: delete environment variables set by pve

[Fabian Grünbichler]

On January 22, 2024 11:12 am, Folke Gleumes wrote:
> proxmox-perl-rs set's SSL_CERT_{DIR,FILE}, which can break ssl in
> containers if their certificate store can't be found in the same spot.
> This patch explicitly unsets those variables before starting the
> container.

after a short talk with Wolfgang - this patch is probably an okay
stop-gap to fix the particular regression.

but it might be nice to switch to `--clear-env` for lxc-attach with
corresponding options for pct to either preserve the whole env, or
particular variables? might be 9.0 material since it is a semantic
change that possibly breaks scripted use cases that rely on env
variables to pass along things from host to whatever they run inside the
container.. we could introduce the options now though and also have a
`--keep-env` that is the default for 8.x, and flip it to default to
`--clear-env` with 9.0.

> 
> Signed-off-by: Folke Gleumes <f.gleumes at proxmox.com>
> ---
>  src/PVE/CLI/pct.pm | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/src/PVE/CLI/pct.pm b/src/PVE/CLI/pct.pm
> index a0b9bce..53519e4 100755
> --- a/src/PVE/CLI/pct.pm
> +++ b/src/PVE/CLI/pct.pm
> @@ -143,6 +143,15 @@ __PACKAGE__->register_method ({
>  	exec(@$cmd);
>      }});
>  
> +sub clean_environment {
> +    # These env variables are currently needed by PVE to work correctly with rust libraries,
> +    # but can break ssl inside of containers.
> +    # An explanation why they are needed and the code that sets them can be found here:
> +    # https://git.proxmox.com/?p=proxmox-perl-rs.git;a=blob;f=common/pkg/Proxmox/Lib/SslProbe.pm
> +    delete $ENV{SSL_CERT_FILE};
> +    delete $ENV{SSL_CERT_DIR};
> +};
> +
>  __PACKAGE__->register_method ({
>      name => 'enter',
>      path => 'enter',
> @@ -164,6 +173,7 @@ __PACKAGE__->register_method ({
>  	PVE::LXC::Config->load_config($vmid); # test if container exists on this node
>  	die "container '$vmid' not running!\n" if !PVE::LXC::check_running($vmid);
>  
> +	clean_environment();
>  	exec('lxc-attach', '-n',  $vmid);
>      }});
>  
> @@ -189,6 +199,7 @@ __PACKAGE__->register_method ({
>  
>  	die "missing command" if !@{$param->{'extra-args'}};
>  
> +	clean_environment();
>  	exec('lxc-attach', '-n', $vmid, '--', @{$param->{'extra-args'}});
>      }});
>  
> -- 
> 2.39.2
> 
> 
> 
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