Our postfix-setup service ensures that the directory is only writable by root.
postalias by default drops permissions to the user of the source file. In the
case of NixOS that file is in the nix store and thus always owned by root and
everything works.
The problem is that when using a nixos-container with user namespaces (`-U`)
then the nix store is owned by nobody/nogroup, and postfix-setup.service will be
unable to create or modify `aliases.db`.
Since the file would otherwise be owned by root, we should tell postfix to not
assume the user and permissions of the `aliases` file by setting -o and -p
From postalias(1)
> -o Do not release root privileges when processing a non-root input file. By
> default, postalias(1) drops root privileges and runs as the source file owner
> instead.
> -p Do not inherit the file access permissions from the input file when
> creating a new file. Instead, create a new file with default access
> permissions (mode 0644).
In the previous state, postfix would still try to use IPv6 addresses,
even when it is disabled in the global networking config.
Cf. https://www.postfix.org/postconf.5.html:
With Postfix 2.8 and earlier the default is "ipv4". For backwards compatibility with these releases,
the Postfix 2.9 and later upgrade procedure appends an explicit "inet_protocols = ipv4" setting to
main.cf when no explicit setting is present.
This compatibility workaround will be phased out as IPv6 deployment becomes more common.
inet_protocols = ipv4
inet_protocols = all (DEFAULT)
inet_protocols = ipv6
inet_protocols = ipv4, ipv6
So setting it to 'all' conditionally does not help, as we are now on version 3.x.
using regular strings works well for docbook because docbook is not as
whitespace-sensitive as markdown. markdown would render all of these as
code blocks when given the chance.
now nix-doc-munge will not introduce whitespace changes when it replaces
manpage references with the MD equivalent.
no change to the manpage, changes to the HTML manual are whitespace only.
the conversion procedure is simple:
- find all things that look like options, ie calls to either `mkOption`
or `lib.mkOption` that take an attrset. remember the attrset as the
option
- for all options, find a `description` attribute who's value is not a
call to `mdDoc` or `lib.mdDoc`
- textually convert the entire value of the attribute to MD with a few
simple regexes (the set from mdize-module.sh)
- if the change produced a change in the manual output, discard
- if the change kept the manual unchanged, add some text to the
description to make sure we've actually found an option. if the
manual changes this time, keep the converted description
this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
Otherwise, it wouldn't get restarted when a new system configuration
was activatad, so the Postfix configuration wouldn't be updated.
Fixes: fb2fa1b50f ("nixos/postfix: pull setup into its own unit")
Consider a service that generates postfix lookup tables with
postmap(1), like Mailman. It needs the Postfix configuration file to
exist, but Postfix qmgr needs all the lookup tables its configured
with to exist before it starts. So the service that runs postmap
needs to run after the Postfix configuration and directory structure
is generated, but before Postfix itself is started. To enable this,
we split Postfix into two units: a oneshot unit that sets up the
configuration, and a longrun unit that supervises the Postfix
daemons. The postmap services can then be inserted in between these
two units.
Postfix has started outputting an error on startup that it can't parse
the compatibility level 9999.
Instead, just set the compatibility level to be identical to the current
version, which seems to be the (new) intent for the compatibility level.
Now that smtp_tls_security_level is using mkDefault, and therefore can
be overridden, there's no need for an option for overriding it to a
specific value.
I run Postfix on my workstation as a smarthost, where it only ever
talks to my SMTP server. Because I know it'll only ever connect to
this server, and because I know this server supports TLS, I'd like to
set smtp_tls_security_level to "encrypt" so Postfix won't fall back to
an unencrypted connection.
`sslCACert` was used for trust store of client and server certificates. Since `smtpd_tls_ask_ccert` defaults to no the setup of `smtpd_tls_CApath` was removed.
>By default (see smtpd_tls_ask_ccert), client certificates are not requested, and smtpd_tls_CApath should remain empty.
see http://www.postfix.org/postconf.5.html#smtpd_tls_CAfile
The new option services.postfix.localRecipients allows
configuring the postfix option 'local_recipient_maps'. When
set to a list of user names (or patterns), that map
effectively replaces the lookup in the system's user
database that's used by default to determine which local
users are valid.
This option is useful to explicitly set local users that are
allowed to receive e-mail from the outside world. For local
injection i.e. via the 'sendmail' command this option has no
effect.
