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feat: Support for Dovecot master accounts (#2535)

Dovecot master accounts can now be configured in DMS via `setup.sh`.
A master account is useful for administration purposes, or to perform mailbox backups of every user account over IMAP.
Upstream Docs: https://doc.dovecot.org/configuration_manual/authentication/master_users/

Co-authored-by: Casper <casperklein@users.noreply.github.com>
Co-authored-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>
This commit is contained in:
Andrew Cornford 2022-05-07 23:28:32 +01:00 committed by GitHub
parent 2977cb6962
commit 2f3cbfc144
Signed by: GitHub
GPG Key ID: 4AEE18F83AFDEB23
16 changed files with 302 additions and 4 deletions

1
.gitignore vendored
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@ -26,6 +26,7 @@ tools/
test/config/empty/
test/config/postfix-accounts.cf
test/config/dovecot-masters.cf
test/config/letsencrypt/mail.my-domain.com/combined.pem
test/config/dovecot-lmtp/userdb
test/config/key*

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@ -107,7 +107,7 @@ RUN \
# --- Dovecot -----------------------------------
# -----------------------------------------------
COPY target/dovecot/auth-passwdfile.inc target/dovecot/??-*.conf /etc/dovecot/conf.d/
COPY target/dovecot/auth-passwdfile.inc target/dovecot/auth-master.inc target/dovecot/??-*.conf /etc/dovecot/conf.d/
COPY target/dovecot/sieve/ /etc/dovecot/sieve/
COPY target/dovecot/dovecot-purge.cron /etc/cron.d/dovecot-purge.disabled
RUN chmod 0 /etc/cron.d/dovecot-purge.disabled

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@ -29,12 +29,16 @@ clean:
# -----------------------------------------------
generate-accounts:
# Normal mail accounts
@ docker run --rm -e MAIL_USER=user1@localhost.localdomain -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)"' > test/config/postfix-accounts.cf
@ docker run --rm -e MAIL_USER=user2@otherdomain.tld -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)"' >> test/config/postfix-accounts.cf
@ docker run --rm -e MAIL_USER=user3@localhost.localdomain -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)|userdb_mail=mbox:~/mail:INBOX=~/inbox"' >> test/config/postfix-accounts.cf
@ echo "# this is a test comment, please don't delete me :'(" >> test/config/postfix-accounts.cf
@ echo " # this is also a test comment, :O" >> test/config/postfix-accounts.cf
# Dovecot master accounts
@ docker run --rm -e MASTER_USER=masterusername -e MASTER_PASS=masterpassword -t $(NAME) /bin/sh -c 'echo "$$MASTER_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MASTER_USER -p $$MASTER_PASS)"' > test/config/dovecot-masters.cf
tests:
@ NAME=$(NAME) ./test/bats/bin/bats --timing test/*.bats

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@ -0,0 +1,21 @@
---
title: 'Advanced | Dovecot master accounts'
---
## Introduction
A dovecot master account is able to login as any configured user. This is useful for administrative tasks like hot backups.
## Configuration
It is possible to create, update, delete and list dovecot master accounts using `setup.sh`. See `setup.sh help` for usage.
This feature is presently [not supported with LDAP](https://github.com/docker-mailserver/docker-mailserver/pull/2535).
## Logging in
Once a master account is configured, it is possible to connect to any users mailbox using this account. Log in over POP3/IMAP using the following credential scheme:
Username: `<EMAIL ADDRESS>*<MASTER ACCOUNT NAME>`
Password: `<MASTER ACCOUNT PASSWORD>`

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@ -148,6 +148,7 @@ nav:
- 'Kubernetes': config/advanced/kubernetes.md
- 'IPv6': config/advanced/ipv6.md
- 'Podman': config/advanced/podman.md
- 'Dovecot Master Accounts': config/advanced/dovecot-master-accounts.md
- 'Examples':
- 'Tutorials':
- 'Basic Installation': examples/tutorials/basic-installation.md

59
target/bin/adddovecotmasteruser Executable file
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@ -0,0 +1,59 @@
#! /bin/bash
# shellcheck disable=SC2094
# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh
DATABASE=/tmp/docker-mailserver/dovecot-masters.cf
function __usage
{
printf "\e[35mADDDOVECOTMASTERUSER\e[31m(\e[93m8\e[31m)
\e[38;5;214mNAME\e[39m
addmasteruser - add a dovecot master user (for POP3/IMAP administration)
\e[38;5;214mSYNOPSIS\e[39m
./setup.sh dovecot-master add <USERNAME> [<PASSWORD>]
\e[38;5;214mOPTIONS\e[39m
\e[94mGeneric Program Information\e[39m
help Print the usage information.
\e[38;5;214mEXAMPLES\e[39m
\e[37m./setup.sh dovecot-master add test-user\e[39m
Add the dovecot master account 'test-user'. You will be prompted
to input a password afterwards since no password was supplied.
\e[38;5;214mEXIT STATUS\e[39m
Exit status is 0 if command was successful. If wrong arguments are provided
or arguments contain errors, the script will exit early with exit status 1.
"
}
[[ ${1:-} == 'help' ]] && { __usage ; exit 0 ; }
USERNAME="${1}"
shift
PASSWD="${*}"
[[ -z ${USERNAME} ]] && { __usage ; _exit_with_error 'No username specified' ; }
touch "${DATABASE}"
_create_lock # Protect config file with lock to avoid race conditions
if grep -qi "^$(_escape "${USERNAME}")|" "${DATABASE}"
then
_exit_with_error "User '${USERNAME}' already exists"
fi
if [[ -z ${PASSWD} ]]
then
read -r -s -p "Enter Password: " PASSWD
echo
[[ -z ${PASSWD} ]] && _exit_with_error "Password must not be empty"
fi
HASH="$(doveadm pw -s SHA512-CRYPT -u "${USERNAME}" -p "${PASSWD}")"
echo "${USERNAME}|${HASH}" >> "${DATABASE}"

75
target/bin/deldovecotmasteruser Executable file
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@ -0,0 +1,75 @@
#! /bin/bash
# shellcheck disable=SC2094
# ? This is done to ignore the message "Make sure not to read and write
# ? the same file in the same pipeline", which is a result of ${DATABASE}
# ? being used below. (This disables the message file-wide.)
# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh
DATABASE=/tmp/docker-mailserver/dovecot-masters.cf
function __usage
{
echo -e "\e[35mDELDOVECOTMASTERUSER\e[31m(\e[93m8\e[31m)
\e[38;5;214mNAME\e[39m
deldovecotmasteruser - delete a dovecot master user
\e[38;5;214mSYNOPSIS\e[39m
./setup.sh dovecot-master del { <USERNAME> [<USERNAME>\e[31m...\e[39m] \e[31m|\e[39m help }
\e[38;5;214mDESCRIPTION\e[39m
Delete a dovecot master user.
\e[38;5;214mOPTIONS\e[39m
-h
Show this help dialogue.
\e[38;5;214mEXAMPLES\e[39m
\e[37m./setup.sh dovecot-master del administrator\e[39m
Delete the dovecot master user called 'administrator'.
\e[37m./setup.sh dovecot-master del administrator admin\e[39m
Delete dovecot master users 'administrator' and 'admin'.
\e[38;5;214mEXIT STATUS\e[39m
Exit status is 0 if command was successful, and 1 if there was an error.
"
}
if [[ ${1} == 'help' ]]
then
__usage
exit 0
fi
shift $((OPTIND-1))
[[ -z ${*} ]] && { __usage ; _exit_with_error 'No user specified' ; }
[[ -s ${DATABASE} ]] || exit 0
_create_lock # Protect config file with lock to avoid race conditions
for USER in "${@}"
do
ERROR=false
# ${USER} must not contain /s and other syntactic characters
UNESCAPED_USER="${USER}"
USER=$(_escape "${USER}")
if [[ -f ${DATABASE} ]]
then
if ! sedfile --strict -i "/^${USER}|/d" "${DATABASE}"
then
_log 'error' "'${UNESCAPED_USER}' couldn't be deleted in '${DATABASE}'"
ERROR=true
fi
fi
${ERROR} && _exit_with_error 'See the messages above.'
done
exit 0

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@ -0,0 +1,21 @@
#! /bin/bash
# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh
# suppress error output, e.g. when listmailuser runs in a fresh container (DMS not running)
# shellcheck source=/dev/null
source /etc/dms-settings 2>/dev/null
DATABASE='/tmp/docker-mailserver/dovecot-masters.cf'
[[ -f ${DATABASE} ]] || _exit_with_error "No 'dovecot-masters.cf' file"
[[ -s ${DATABASE} ]] || _exit_with_error "Empty 'dovecot-masters.cf' - no dovecot master accounts have been added"
while read -r LINE
do
USER=$(echo "${LINE}" | cut -d'|' -f1)
echo "* ${USER}"
done < "${DATABASE}"
exit 0

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@ -25,7 +25,7 @@ ${ORANGE}NAME${RESET}
${ORANGE}SYNOPSIS${RESET}
./${SCRIPT:-${0}} [ OPTIONS${RED}...${RESET} ] COMMAND [ help ${RED}|${RESET} ARGUMENTS${RED}...${RESET} ]
COMMAND ${RED}:=${RESET} { email ${RED}|${RESET} alias ${RED}|${RESET} quota ${RED}|${RESET} config ${RED}|${RESET} relay ${RED}|${RESET} debug } SUBCOMMAND
COMMAND ${RED}:=${RESET} { email ${RED}|${RESET} alias ${RED}|${RESET} quota ${RED}|${RESET} dovecot-master ${RED}|${RESET} config ${RED}|${RESET} relay ${RED}|${RESET} debug } SUBCOMMAND
${ORANGE}DESCRIPTION${RESET}
This is the main administration script that you use for all your interactions with
@ -59,6 +59,12 @@ ${RED}[${ORANGE}SUB${RED}]${ORANGE}COMMANDS${RESET}
${0} quota ${CYAN}set${RESET} <EMAIL ADDRESS> [<QUOTA>]
${0} quota ${CYAN}del${RESET} <EMAIL ADDRESS>
${LBLUE}COMMAND${RESET} dovecot-master ${RED}:=${RESET}
${0} dovecot-master ${CYAN}add${RESET} <USERNAME> [<PASSWORD>]
${0} dovecot-master ${CYAN}update${RESET} <USERNAME> [<PASSWORD>]
${0} dovecot-master ${CYAN}del${RESET} [ OPTIONS${RED}...${RESET} ] <USERNAME> [ <USERNAME>${RED}...${RESET} ]
${0} dovecot-master ${CYAN}list${RESET}
${LBLUE}COMMAND${RESET} config ${RED}:=${RESET}
${0} config ${CYAN}dkim${RESET} [ ARGUMENTS${RED}...${RESET} ]
@ -132,6 +138,16 @@ function _main
esac
;;
( dovecot-master )
case ${2:-} in
( add ) shift 2 ; adddovecotmasteruser "${@}" ;;
( update ) shift 2 ; updatedovecotmasteruser "${@}" ;;
( del ) shift 2 ; deldovecotmasteruser "${@}" ;;
( list ) listdovecotmasteruser ;;
( * ) _invalid_command "${1}" "${2}" ;;
esac
;;
( config )
case ${2:-} in
( dkim ) shift 2 ; open-dkim "${@}" ;;

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@ -0,0 +1,33 @@
#! /bin/bash
# ? This is done to ignore the message "Make sure not to read and write
# ? the same file in the same pipeline", which is a result of ${DATABASE}
# ? being used below. (This disables the message file-wide.)
# shellcheck disable=SC2094
# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh
DATABASE=/tmp/docker-mailserver/dovecot-masters.cf
USER="${1}"
shift
PASSWD="${*}"
function __usage { echo 'Usage: updatedovecotmasteruser <USERNAME> [PASSWORD]' ; }
[[ -z ${USER} ]] && { __usage ; _exit_with_error 'No username specified' ; }
if [[ -z ${PASSWD} ]]
then
read -r -s -p 'Enter Password: ' PASSWD
echo
[[ -z ${PASSWD} ]] && _exit_with_error 'Password must not be empty'
fi
HASH="$(doveadm pw -s SHA512-CRYPT -u "${USER}" -p "${PASSWD}")"
touch "${DATABASE}"
_create_lock # Protect config file with lock to avoid race conditions
grep -qi "^$(_escape "${USER}")|" "${DATABASE}" 2>/dev/null || _exit_with_error "Master user \"${USER}\" does not exist"
sed -i "s ^""${USER}""|.* ""${USER}""|""${HASH}"" " "${DATABASE}"

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@ -126,3 +126,5 @@ auth_mechanisms = plain login
#!include auth-checkpassword.conf.ext
#!include auth-vpopmail.conf.ext
#!include auth-static.conf.ext
#!include auth-master.inc

9
target/dovecot/auth-master.inc Executable file
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@ -0,0 +1,9 @@
auth_master_user_separator = *
passdb {
driver = passwd-file
args = scheme=SHA512-CRYPT username_format=%u /etc/dovecot/masterdb
master = yes
result_success = continue
#auth_bind = yes
}

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@ -7,13 +7,17 @@
# Only an issue when $myhostname is an exact match (eg: bare domain FQDN).
DOVECOT_USERDB_FILE=/etc/dovecot/userdb
DOVECOT_MASTERDB_FILE=/etc/dovecot/masterdb
function _create_accounts
{
: >/etc/postfix/vmailbox
: >"${DOVECOT_USERDB_FILE}"
if [[ -f /tmp/docker-mailserver/postfix-accounts.cf ]] && [[ ${ENABLE_LDAP} -ne 1 ]]
[[ ${ENABLE_LDAP} -eq 1 ]] && return 0
_create_masters
if [[ -f /tmp/docker-mailserver/postfix-accounts.cf ]]
then
_log 'trace' "Checking file line endings"
sed -i 's|\r||g' /tmp/docker-mailserver/postfix-accounts.cf
@ -164,3 +168,48 @@ function _create_dovecot_alias_dummy_accounts
done < /tmp/docker-mailserver/postfix-virtual.cf
fi
}
# Support Dovecot master user: https://doc.dovecot.org/configuration_manual/authentication/master_users/
# Supporting LDAP users requires `auth_bind = yes` in `dovecot-ldap.conf.ext`, see docker-mailserver/docker-mailserver/pull/2535 for details
function _create_masters
{
: >"${DOVECOT_MASTERDB_FILE}"
if [[ -f /tmp/docker-mailserver/dovecot-masters.cf ]]
then
_log 'trace' "Checking file line endings"
sed -i 's|\r||g' /tmp/docker-mailserver/dovecot-masters.cf
_log 'trace' "Regenerating dovecot masters list"
# checking that /tmp/docker-mailserver/dovecot-masters.cf ends with a newline
# shellcheck disable=SC1003
sed -i -e '$a\' /tmp/docker-mailserver/dovecot-masters.cf
chown dovecot:dovecot "${DOVECOT_MASTERDB_FILE}"
chmod 640 "${DOVECOT_MASTERDB_FILE}"
sed -i -e '/\!include auth-master\.inc/s/^#//' /etc/dovecot/conf.d/10-auth.conf
# creating users ; 'pass' is encrypted
# comments and empty lines are ignored
local LOGIN PASS
while IFS=$'|' read -r LOGIN PASS
do
_log 'debug' "Creating master user '${LOGIN}'"
local DOVECOT_MASTERDB_LINE
# Dovecot's masterdb has the following format
# user:password
DOVECOT_MASTERDB_LINE="${LOGIN}:${PASS}"
if grep -qF "${DOVECOT_MASTERDB_LINE}" "${DOVECOT_MASTERDB_FILE}"
then
_log 'warn' "Login '${LOGIN}' will not be added to '${DOVECOT_MASTERDB_FILE}' twice"
else
echo "${DOVECOT_MASTERDB_LINE}" >>"${DOVECOT_MASTERDB_FILE}"
fi
done < <(grep -v "^\s*$\|^\s*\#" /tmp/docker-mailserver/dovecot-masters.cf)
fi
}

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@ -483,6 +483,7 @@ function _monitored_files_checksums
"${DMS_DIR}/postfix-virtual.cf"
"${DMS_DIR}/postfix-aliases.cf"
"${DMS_DIR}/dovecot-quotas.cf"
"${DMS_DIR}/dovecot-masters.cf"
)
if [[ ${SSL_TYPE:-} == 'manual' ]]

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@ -298,7 +298,7 @@ function _should_be_equal_in_content() {
function _get_service_logs() {
local SERVICE=${1:-'mailserver'}
local CMD_LOGS=(docker exec "${TEST_NAME}" "supervisorctl tail -2000 ${SERVICE}")
local CMD_LOGS=(docker exec "${TEST_NAME}" "supervisorctl tail -2200 ${SERVICE}")
# As the `mailserver` service logs are not stored in a file but output to stdout/stderr,
# The `supervisorctl tail` command won't work; we must instead query via `docker logs`:

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@ -40,3 +40,9 @@ teardown_file() {
run docker exec mail_with_imap /bin/sh -c "nc -w 5 0.0.0.0 25 < /tmp/docker-mailserver-test/auth/smtp-auth-login.txt | grep 'Authentication successful'"
assert_success
}
# master account
@test "checking dovecot: master account can login" {
run docker exec mail_with_imap bash -c "testsaslauthd -u user1@localhost.localdomain*masterusername -p masterpassword"
assert_success
}