[pbs-devel] [PATCH proxmox-backup] config: check if acme domain with wildcard uses dns challenge

[Christian Ebner]

Tried to generate a wildcard certificate using the cloudflare DNS plugin 
with these patches applied.

Unfortunately this fails with an error (domain obfuscated, but its the 
domain without the "*." prefix):
```
TASK ERROR: no config for domain 'mydomain'
```

So it seem there still is an issue when retrieving the domain from the 
config here:
https://git.proxmox.com/?p=proxmox-backup.git;a=blob;f=src/api2/node/certificates.rs;h=61ef910e47a71a005064d2b1e99d3d97b0d43f51;hb=HEAD#l342

Also, nit inline.

On 9/17/24 11:47, Gabriel Goller wrote:
> As already mentioned in our docs [0], wildcard domains are only
> supported when the dns-challenge is used. If the dns-challenge is not
> used, throw an error.
> 
> [0]: https://pbs.proxmox.com/docs/sysadmin.html#wildcard-certificates
> 
> Signed-off-by: Gabriel Goller <g.goller at proxmox.com>
> ---
>   src/config/node.rs | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/src/config/node.rs b/src/config/node.rs
> index 937beb3a125c..80a503635344 100644
> --- a/src/config/node.rs
> +++ b/src/config/node.rs
> @@ -272,6 +272,16 @@ impl NodeConfig {
>               if !domains.insert(domain.domain.to_lowercase()) {
>                   bail!("duplicate domain '{}' in ACME config", domain.domain);
>               }
> +            if domain.domain.contains('*')
> +                && domain.plugin.map_or(true, |value| {
> +                    value.as_str() == "" || value.as_str() == "standalone"
> +                })
> +            {
> +                bail!(
> +                    "wildcard domains like '{}' are only usable with the DNS challenge type",

nit: Above checks for standalone HTTP challenge, so instead of stating 
that the wildcard is only usable with DNS challenges, I think it would 
be better to state that it is not usable with the HTTP challenge instead.

> +                    domain.domain
> +                );
> +            }
>           }
>           let mut dummy_acceptor = SslAcceptor::mozilla_intermediate_v5(SslMethod::tls()).unwrap();
>           if let Some(ciphers) = self.ciphers_tls_1_3.as_deref() {