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Support customized maildir type and location per virtual user

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This adds the option to add a customized userdb_mail parameter to the
Dovecot userdb, overriding the global mail_location setting. This
change applies to both mail delivery (handled via LMTP from postfix to
Dovecot), as well as Maildir access via IMAP etc. Furthermore, the UID
and GID can be customized to reflect the desired permissions. Finally,
the Dovecot virtual user home, holding the user's private state, can
be set.

These changes allow for great flexibility in the mail server
setup. For instance, users can selectively have their mail accessible
through a Maildir in their home directory, or via a purely virtual
user maintained under /var/vmail.
This commit is contained in:
Leon Schuermann 2022-05-06 19:05:21 +02:00
parent 6b425d13f5
commit 51cdb83674
2 changed files with 72 additions and 6 deletions
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54
default.nix
View File

@ -140,6 +140,60 @@ in
'';
};
customMaildir = mkOption {
type = types.nullOr (types.submodule ({ name, ...}: {
options = {
uid = mkOption {
type = types.int;
example = 1000;
description = ''
User ID for files and directories in the maildir. Files and
directories created by Dovecot will be assigned this UID.
'';
};
gid = mkOption {
type = types.int;
example = 1000;
description = ''
Group ID for files and directories in the maildir. Files and
directories created by Dovecot will be assigned this GID.
'';
};
dovecotHome = mkOption {
type = types.str;
example = "/home/myusername";
description = ''
Home directory for Dovecot virtual user. This is used to
maintain mail user's private state. This MUST be different
for each Dovecot virtual user and MUST be an absolute path.
Refer to the Dovecot documentation for further information
on this configuration option:
https://wiki.dovecot.org/VirtualUsers/Home
'';
};
mailDirectorySpec = mkOption {
type = types.str;
example = "maildir:~/mail";
description = ''
Dovecot mail location specification. Refer to the Dovecot
documentation for further information on this configuration
option:
https://doc.dovecot.org/configuration_manual/mail_location/
'';
};
};
}));
default = null;
description = ''
Configuration options for a custom Maildir location. For instance,
this can be used to implement home-directory Maildirs for specific
users only. If null, a Maildir under /var/vmail will be assigned.
'';
};
sieveScript = mkOption {
type = with types; nullOr lines;
default = null;

24
mail-server/dovecot.nix
View File

@ -123,12 +123,24 @@ let
EOF
cat <<EOF > ${userdbFile}
${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value:
"${name}:::::::"
+ (if lib.isString value.quota
then "userdb_quota_rule=*:storage=${value.quota}"
else "")
) cfg.loginAccounts)}
${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: value: (
if value.customMaildir == null then (
"${name}:::::::"
) else (
"${name}:"
+ ":${builtins.toString value.customMaildir.uid}"
+ ":${builtins.toString value.customMaildir.gid}"
+ ":"
+ ":${value.customMaildir.dovecotHome}"
+ ":/run/current-system/sw/bin/nologin"
+ ":userdb_mail=${value.customMaildir.mailDirectorySpec}"
)
) + (
if lib.isString value.quota then
" userdb_quota_rule=*:storage=${value.quota}"
else
""
)) cfg.loginAccounts)}
EOF
'';