163 lines
7.4 KiB
Bash
Executable File
163 lines
7.4 KiB
Bash
Executable File
#!/bin/bash
|
|
#
|
|
# User Authentication and Destination Validation
|
|
# ----------------------------------------------
|
|
#
|
|
# This script configures user authentication for Dovecot
|
|
# and Postfix (which relies on Dovecot) and destination
|
|
# validation by quering an Sqlite3 database of mail users.
|
|
|
|
source setup/functions.sh # load our functions
|
|
source /etc/mailinabox.conf # load global vars
|
|
|
|
# ### User and Alias Database
|
|
|
|
# The database of mail users (i.e. authenticated users, who have mailboxes)
|
|
# and aliases (forwarders).
|
|
|
|
db_path=$STORAGE_ROOT/mail/users.sqlite
|
|
|
|
# Create an empty database if it doesn't yet exist.
|
|
if [ ! -f "$db_path" ]; then
|
|
echo "Creating new user database: $db_path";
|
|
echo "CREATE TABLE users (id INTEGER PRIMARY KEY AUTOINCREMENT, email TEXT NOT NULL UNIQUE, password TEXT NOT NULL, extra, privileges TEXT NOT NULL DEFAULT '');" | sqlite3 "$db_path";
|
|
echo "CREATE TABLE aliases (id INTEGER PRIMARY KEY AUTOINCREMENT, source TEXT NOT NULL UNIQUE, destination TEXT NOT NULL, permitted_senders TEXT);" | sqlite3 "$db_path";
|
|
echo "CREATE TABLE mfa (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER NOT NULL, type TEXT NOT NULL, secret TEXT NOT NULL, mru_token TEXT, label TEXT, FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE);" | sqlite3 "$db_path";
|
|
echo "CREATE TABLE auto_aliases (id INTEGER PRIMARY KEY AUTOINCREMENT, source TEXT NOT NULL UNIQUE, destination TEXT NOT NULL, permitted_senders TEXT);" | sqlite3 "$db_path";
|
|
fi
|
|
|
|
# ### User Authentication
|
|
|
|
# Have Dovecot query our database, and not system users, for authentication.
|
|
sed -i "s/#*\(\!include auth-system.conf.ext\)/#\1/" /etc/dovecot/conf.d/10-auth.conf
|
|
sed -i "s/#\(\!include auth-sql.conf.ext\)/\1/" /etc/dovecot/conf.d/10-auth.conf
|
|
|
|
# Specify how the database is to be queried for user authentication (passdb)
|
|
# and where user mailboxes are stored (userdb).
|
|
cat > /etc/dovecot/conf.d/auth-sql.conf.ext << EOF;
|
|
passdb {
|
|
driver = sql
|
|
args = /etc/dovecot/dovecot-sql.conf.ext
|
|
}
|
|
userdb {
|
|
driver = sql
|
|
args = /etc/dovecot/dovecot-sql.conf.ext
|
|
}
|
|
EOF
|
|
|
|
# Configure the SQL to query for a user's metadata and password.
|
|
cat > /etc/dovecot/dovecot-sql.conf.ext << EOF;
|
|
driver = sqlite
|
|
connect = $db_path
|
|
default_pass_scheme = SHA512-CRYPT
|
|
password_query = SELECT email as user, password FROM users WHERE email='%u';
|
|
user_query = SELECT email AS user, "mail" as uid, "mail" as gid, "$STORAGE_ROOT/mail/mailboxes/%d/%n" as home FROM users WHERE email='%u';
|
|
iterate_query = SELECT email AS user FROM users;
|
|
EOF
|
|
chmod 0600 /etc/dovecot/dovecot-sql.conf.ext # per Dovecot instructions
|
|
|
|
# Have Dovecot provide an authorization service that Postfix can access & use.
|
|
cat > /etc/dovecot/conf.d/99-local-auth.conf << EOF;
|
|
service auth {
|
|
unix_listener /var/spool/postfix/private/auth {
|
|
mode = 0666
|
|
user = postfix
|
|
group = postfix
|
|
}
|
|
}
|
|
EOF
|
|
|
|
# And have Postfix use that service. We *disable* it here
|
|
# so that authentication is not permitted on port 25 (which
|
|
# does not run DKIM on relayed mail, so outbound mail isn't
|
|
# correct, see #830), but we enable it specifically for the
|
|
# submission port.
|
|
tools/editconf.py /etc/postfix/main.cf \
|
|
smtpd_sasl_type=dovecot \
|
|
smtpd_sasl_path=private/auth \
|
|
smtpd_sasl_auth_enable=no
|
|
|
|
# ### Sender Validation
|
|
|
|
# We use Postfix's reject_authenticated_sender_login_mismatch filter to
|
|
# prevent intra-domain spoofing by logged in but untrusted users in outbound
|
|
# email. In all outbound mail (the sender has authenticated), the MAIL FROM
|
|
# address (aka envelope or return path address) must be "owned" by the user
|
|
# who authenticated. An SQL query will find who are the owners of any given
|
|
# address.
|
|
tools/editconf.py /etc/postfix/main.cf \
|
|
smtpd_sender_login_maps=sqlite:/etc/postfix/sender-login-maps.cf
|
|
|
|
# Postfix will query the exact address first, where the priority will be alias
|
|
# records first, then user records. If there are no matches for the exact
|
|
# address, then Postfix will query just the domain part, which we call
|
|
# catch-alls and domain aliases. A NULL permitted_senders column means to
|
|
# take the value from the destination column.
|
|
cat > /etc/postfix/sender-login-maps.cf << EOF;
|
|
dbpath=$db_path
|
|
query = SELECT permitted_senders FROM (SELECT permitted_senders, 0 AS priority FROM aliases WHERE source='%s' AND permitted_senders IS NOT NULL UNION SELECT destination AS permitted_senders, 1 AS priority FROM aliases WHERE source='%s' AND permitted_senders IS NULL UNION SELECT email as permitted_senders, 2 AS priority FROM users WHERE email='%s') ORDER BY priority LIMIT 1;
|
|
EOF
|
|
|
|
# ### Destination Validation
|
|
|
|
# Use a Sqlite3 database to check whether a destination email address exists,
|
|
# and to perform any email alias rewrites in Postfix. Additionally, we disable
|
|
# SMTPUTF8 because Dovecot's LMTP server that delivers mail to inboxes does
|
|
# not support it, and if a message is received with the SMTPUTF8 flag it will
|
|
# bounce.
|
|
tools/editconf.py /etc/postfix/main.cf \
|
|
smtputf8_enable=no \
|
|
virtual_mailbox_domains=sqlite:/etc/postfix/virtual-mailbox-domains.cf \
|
|
virtual_mailbox_maps=sqlite:/etc/postfix/virtual-mailbox-maps.cf \
|
|
virtual_alias_maps=sqlite:/etc/postfix/virtual-alias-maps.cf \
|
|
local_recipient_maps=\$virtual_mailbox_maps
|
|
|
|
# SQL statement to check if we handle incoming mail for a domain, either for users or aliases.
|
|
cat > /etc/postfix/virtual-mailbox-domains.cf << EOF;
|
|
dbpath=$db_path
|
|
query = SELECT 1 FROM users WHERE email LIKE '%%@%s' UNION SELECT 1 FROM aliases WHERE source LIKE '%%@%s' UNION SELECT 1 FROM auto_aliases WHERE source LIKE '%%@%s'
|
|
EOF
|
|
|
|
# SQL statement to check if we handle incoming mail for a user.
|
|
cat > /etc/postfix/virtual-mailbox-maps.cf << EOF;
|
|
dbpath=$db_path
|
|
query = SELECT 1 FROM users WHERE email='%s'
|
|
EOF
|
|
|
|
# SQL statement to rewrite an email address if an alias is present.
|
|
#
|
|
# Postfix makes multiple queries for each incoming mail. It first
|
|
# queries the whole email address, then just the user part in certain
|
|
# locally-directed cases (but we don't use this), then just `@`+the
|
|
# domain part. The first query that returns something wins. See
|
|
# http://www.postfix.org/virtual.5.html.
|
|
#
|
|
# virtual-alias-maps has precedence over virtual-mailbox-maps, but
|
|
# we don't want catch-alls and domain aliases to catch mail for users
|
|
# that have been defined on those domains. To fix this, we not only
|
|
# query the aliases table but also the users table when resolving
|
|
# aliases, i.e. we turn users into aliases from themselves to
|
|
# themselves. That means users will match in postfix's first query
|
|
# before postfix gets to the third query for catch-alls/domain alises.
|
|
#
|
|
# If there is both an alias and a user for the same address either
|
|
# might be returned by the UNION, so the whole query is wrapped in
|
|
# another select that prioritizes the alias definition to preserve
|
|
# postfix's preference for aliases for whole email addresses.
|
|
#
|
|
# Since we might have alias records with an empty destination because
|
|
# it might have just permitted_senders, skip any records with an
|
|
# empty destination here so that other lower priority rules might match.
|
|
cat > /etc/postfix/virtual-alias-maps.cf << EOF;
|
|
dbpath=$db_path
|
|
query = SELECT destination from (SELECT destination, 0 as priority FROM aliases WHERE source='%s' AND destination<>'' UNION SELECT email as destination, 1 as priority FROM users WHERE email='%s' UNION SELECT destination, 2 as priority FROM auto_aliases WHERE source='%s' AND destination<>'') ORDER BY priority LIMIT 1;
|
|
EOF
|
|
|
|
# Restart Services
|
|
##################
|
|
|
|
restart_service postfix
|
|
restart_service dovecot
|
|
|
|
|