typo

load the certs per listening address

send host addresses to the server process

better fd rampage avoidance flush imsg right in config_send_file()

implement `listen on' Listening by default on all the addresses is so bad I don't know why I haven't changed this before. Anyway. Add a `listen on $hostname port $port' syntax to the config file and deprecate the old "port" and "ipv6" global setting. Still try to honour them when no "listen on" directive is used for backward compatibily, but this will go away in the next next version hopefully. At the moment the `listen on' in server context don't filter the host, i.e. one can still reach a host from a address not specified in the corresponding `liste on', this will be added later.

load_ca: get a buffer instead of a fd We dup(1) the ca fd and send it to various processes, so they fail loading it. Instead, use load_file to get a buffer with the file content and pass that to load_ca which then loads via BIO.

simplify config_send_kp: use config_send_file

disable the privsep crypto engine on !OpenBSD it fails bandly at runtime on various linux distros and on freebsd. Until a fix is found, disable it so I can move forward.

add a privsep crypto engine Incorporate the OpenSMTPD' privsep crypto engine. The idea behind it is to never load the certificate' private keys in a networked process, instead they are loaded in a separate process (the `crypto' one) which signs payloads on the behalf of the server processes. This way, we greatly reduce the risk of leaking the certificate' private key should the server process be compromised. This currently compiles only on LibreSSL (portable fix is in the way).

rework load_file to use pread() avoids issues since the same file is sent to multiple processes after being dup()'ed. Since these files are meant to be regular files, I don't expect short reads.

adjust how locations are received

simplify ocsp sending using config_send_file while here add an explicit flush to avoid a fd rampage.

change config_send_file to take the process id as argument i.e. not hardcode PROC_SERVER

don't have the config being a global

move hosts into the config struct