mailinabox/management/mailconfig.py

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#!/usr/bin/python3
import subprocess, shutil, os, sqlite3, re
import utils
def validate_email(email, mode=None):
# There are a lot of characters permitted in email addresses, but
# Dovecot's sqlite driver seems to get confused if there are any
# unusual characters in the address. Bah. Also note that since
# the mailbox path name is based on the email address, the address
# shouldn't be absurdly long and must not have a forward slash.
if len(email) > 255: return False
if mode == 'user':
# For Dovecot's benefit, only allow basic characters.
ATEXT = r'[\w\-]'
elif mode == 'alias':
# For aliases, we can allow any valid email address.
# Based on RFC 2822 and https://github.com/SyrusAkbary/validate_email/blob/master/validate_email.py,
# these characters are permitted in email addresses.
ATEXT = r'[\w!#$%&\'\*\+\-/=\?\^`\{\|\}~]' # see 3.2.4
else:
raise ValueError(mode)
# per RFC 2822 3.2.4
DOT_ATOM_TEXT_LOCAL = ATEXT + r'+(?:\.' + ATEXT + r'+)*'
if mode == 'alias':
# For aliases, Postfix accepts '@domain.tld' format for
# catch-all addresses. Make the local part optional.
DOT_ATOM_TEXT_LOCAL = '(?:' + DOT_ATOM_TEXT_LOCAL + ')?'
# as above, but we can require that the host part have at least
# one period in it, so use a "+" rather than a "*" at the end
DOT_ATOM_TEXT_HOST = ATEXT + r'+(?:\.' + ATEXT + r'+)+'
# per RFC 2822 3.4.1
ADDR_SPEC = '^%s@%s$' % (DOT_ATOM_TEXT_LOCAL, DOT_ATOM_TEXT_HOST)
return re.match(ADDR_SPEC, email)
def open_database(env, with_connection=False):
conn = sqlite3.connect(env["STORAGE_ROOT"] + "/mail/users.sqlite")
if not with_connection:
return conn.cursor()
else:
return conn, conn.cursor()
def get_mail_users(env, as_json=False):
c = open_database(env)
c.execute('SELECT email, privileges FROM users')
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# turn into a list of tuples, but sorted by domain & email address
users = { row[0]: row[1] for row in c.fetchall() } # make dict
users = [ (email, users[email]) for email in utils.sort_email_addresses(users.keys(), env) ]
if not as_json:
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return [email for email, privileges in users]
else:
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aliases = get_mail_alias_map(env)
return [
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{
"email": email,
"privileges": parse_privs(privileges),
"status": "active",
"aliases": [
(alias, sorted(evaluate_mail_alias_map(alias, aliases, env)))
for alias in aliases.get(email.lower(), [])
]
}
for email, privileges in users
]
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def get_archived_mail_users(env):
real_users = set(get_mail_users(env))
root = os.path.join(env['STORAGE_ROOT'], 'mail/mailboxes')
ret = []
for domain_enc in os.listdir(root):
for user_enc in os.listdir(os.path.join(root, domain_enc)):
email = utils.unsafe_domain_name(user_enc) + "@" + utils.unsafe_domain_name(domain_enc)
if email in real_users: continue
ret.append({
"email": email,
"privileges": "",
"status": "inactive"
})
return ret
def get_mail_aliases(env, as_json=False):
c = open_database(env)
c.execute('SELECT source, destination FROM aliases')
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aliases = { row[0]: row[1] for row in c.fetchall() } # make dict
# put in a canonical order: sort by domain, then by email address lexicographically
aliases = [ (source, aliases[source]) for source in utils.sort_email_addresses(aliases.keys(), env) ] # sort
# but put automatic aliases to administrator@ last
aliases.sort(key = lambda x : x[1] == get_system_administrator(env))
if as_json:
required_aliases = get_required_aliases(env)
aliases = [
{
"source": alias[0],
"destination": [d.strip() for d in alias[1].split(",")],
"required": alias[0] in required_aliases or alias[0] == get_system_administrator(env),
}
for alias in aliases
]
return aliases
def get_mail_alias_map(env):
aliases = { }
for alias, targets in get_mail_aliases(env):
for em in targets.split(","):
em = em.strip().lower()
aliases.setdefault(em, []).append(alias)
return aliases
def evaluate_mail_alias_map(email, aliases, env):
ret = set()
for alias in aliases.get(email.lower(), []):
ret.add(alias)
ret |= evaluate_mail_alias_map(alias, aliases, env)
return ret
def get_mail_domains(env, filter_aliases=lambda alias : True):
def get_domain(emailaddr):
return emailaddr.split('@', 1)[1]
return set(
[get_domain(addr) for addr in get_mail_users(env)]
+ [get_domain(source) for source, target in get_mail_aliases(env) if filter_aliases((source, target)) ]
)
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def add_mail_user(email, pw, privs, env):
# validate email
if email.strip() == "":
return ("No email address provided.", 400)
if not validate_email(email, mode='user'):
return ("Invalid email address.", 400)
validate_password(pw)
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# validate privileges
if privs is None or privs.strip() == "":
privs = []
else:
privs = privs.split("\n")
for p in privs:
validation = validate_privilege(p)
if validation: return validation
# get the database
conn, c = open_database(env, with_connection=True)
# hash the password
pw = utils.shell('check_output', ["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip()
# add the user to the database
try:
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c.execute("INSERT INTO users (email, password, privileges) VALUES (?, ?, ?)",
(email, pw, "\n".join(privs)))
except sqlite3.IntegrityError:
return ("User already exists.", 400)
# write databasebefore next step
conn.commit()
# Create the user's INBOX, Spam, and Drafts folders, and subscribe them.
# K-9 mail will poll every 90 seconds if a Drafts folder does not exist, so create it
# to avoid unnecessary polling.
# Check if the mailboxes exist before creating them. When creating a user that had previously
# been deleted, the mailboxes will still exist because they are still on disk.
try:
existing_mboxes = utils.shell('check_output', ["doveadm", "mailbox", "list", "-u", email, "-8"], capture_stderr=True).split("\n")
except subprocess.CalledProcessError as e:
c.execute("DELETE FROM users WHERE email=?", (email,))
conn.commit()
return ("Failed to initialize the user: " + e.output.decode("utf8"), 400)
for folder in ("INBOX", "Spam", "Drafts"):
if folder not in existing_mboxes:
utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", folder])
# Update things in case any new domains are added.
return kick(env, "mail user added")
def set_mail_password(email, pw, env):
validate_password(pw)
# hash the password
pw = utils.shell('check_output', ["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip()
# update the database
conn, c = open_database(env, with_connection=True)
c.execute("UPDATE users SET password=? WHERE email=?", (pw, email))
if c.rowcount != 1:
return ("That's not a user (%s)." % email, 400)
conn.commit()
return "OK"
def remove_mail_user(email, env):
conn, c = open_database(env, with_connection=True)
c.execute("DELETE FROM users WHERE email=?", (email,))
if c.rowcount != 1:
return ("That's not a user (%s)." % email, 400)
conn.commit()
# Update things in case any domains are removed.
return kick(env, "mail user removed")
def parse_privs(value):
return [p for p in value.split("\n") if p.strip() != ""]
def get_mail_user_privileges(email, env):
c = open_database(env)
c.execute('SELECT privileges FROM users WHERE email=?', (email,))
rows = c.fetchall()
if len(rows) != 1:
return ("That's not a user (%s)." % email, 400)
return parse_privs(rows[0][0])
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def validate_privilege(priv):
if "\n" in priv or priv.strip() == "":
return ("That's not a valid privilege (%s)." % priv, 400)
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return None
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def add_remove_mail_user_privilege(email, priv, action, env):
# validate
validation = validate_privilege(priv)
if validation: return validation
# get existing privs, but may fail
privs = get_mail_user_privileges(email, env)
if isinstance(privs, tuple): return privs # error
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# update privs set
if action == "add":
if priv not in privs:
privs.append(priv)
elif action == "remove":
privs = [p for p in privs if p != priv]
else:
return ("Invalid action.", 400)
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# commit to database
conn, c = open_database(env, with_connection=True)
c.execute("UPDATE users SET privileges=? WHERE email=?", ("\n".join(privs), email))
if c.rowcount != 1:
return ("Something went wrong.", 400)
conn.commit()
return "OK"
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def add_mail_alias(source, destination, env, update_if_exists=False, do_kick=True):
# validate source
if source.strip() == "":
return ("No incoming email address provided.", 400)
if not validate_email(source, mode='alias'):
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return ("Invalid incoming email address (%s)." % source, 400)
# parse comma and \n-separated destination emails & validate
dests = []
for line in destination.split("\n"):
for email in line.split(","):
email = email.strip()
if email == "": continue
if not validate_email(email, mode='alias'):
return ("Invalid destination email address (%s)." % email, 400)
dests.append(email)
if len(destination) == 0:
return ("No destination email address(es) provided.", 400)
destination = ",".join(dests)
conn, c = open_database(env, with_connection=True)
try:
c.execute("INSERT INTO aliases (source, destination) VALUES (?, ?)", (source, destination))
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return_status = "alias added"
except sqlite3.IntegrityError:
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if not update_if_exists:
return ("Alias already exists (%s)." % source, 400)
else:
c.execute("UPDATE aliases SET destination = ? WHERE source = ?", (destination, source))
return_status = "alias updated"
conn.commit()
if do_kick:
# Update things in case any new domains are added.
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return kick(env, return_status)
def remove_mail_alias(source, env, do_kick=True):
conn, c = open_database(env, with_connection=True)
c.execute("DELETE FROM aliases WHERE source=?", (source,))
if c.rowcount != 1:
return ("That's not an alias (%s)." % source, 400)
conn.commit()
if do_kick:
# Update things in case any domains are removed.
return kick(env, "alias removed")
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def get_system_administrator(env):
return "administrator@" + env['PRIMARY_HOSTNAME']
def get_required_aliases(env):
# These are the aliases that must exist.
aliases = set()
# The hostmaster alias is exposed in the DNS SOA for each zone.
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aliases.add("hostmaster@" + env['PRIMARY_HOSTNAME'])
# Get a list of domains we serve mail for, except ones for which the only
# email on that domain is a postmaster/admin alias to the administrator.
real_mail_domains = get_mail_domains(env,
filter_aliases = lambda alias : \
(not alias[0].startswith("postmaster@") \
and not alias[0].startswith("admin@")) \
or alias[1] != get_system_administrator(env) \
)
# Create postmaster@ and admin@ for all domains we serve mail on.
# postmaster@ is assumed to exist by our Postfix configuration. admin@
# isn't anything, but it might save the user some trouble e.g. when
# buying an SSL certificate.
for domain in real_mail_domains:
aliases.add("postmaster@" + domain)
aliases.add("admin@" + domain)
return aliases
def kick(env, mail_result=None):
results = []
# Inclde the current operation's result in output.
if mail_result is not None:
results.append(mail_result + "\n")
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# Ensure every required alias exists.
existing_users = get_mail_users(env)
existing_aliases = get_mail_aliases(env)
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required_aliases = get_required_aliases(env)
def ensure_admin_alias_exists(source):
# If a user account exists with that address, we're good.
if source in existing_users:
return
# Does this alias exists?
for s, t in existing_aliases:
if s == source:
return
# Doesn't exist.
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administrator = get_system_administrator(env)
add_mail_alias(source, administrator, env, do_kick=False)
results.append("added alias %s (=> %s)\n" % (source, administrator))
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for alias in required_aliases:
ensure_admin_alias_exists(alias)
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# Remove auto-generated postmaster/admin on domains we no
# longer have any other email addresses for.
for source, target in existing_aliases:
user, domain = source.split("@")
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if user in ("postmaster", "admin") \
and source not in required_aliases \
and target == get_system_administrator(env):
remove_mail_alias(source, env, do_kick=False)
results.append("removed alias %s (was to %s; domain no longer used for email)\n" % (source, target))
# Update DNS and nginx in case any domains are added/removed.
from dns_update import do_dns_update
results.append( do_dns_update(env) )
from web_update import do_web_update
results.append( do_web_update(env) )
return "".join(s for s in results if s != "")
def validate_password(pw):
# validate password
if pw.strip() == "":
raise ValueError("No password provided.")
if re.search(r"[\s]", pw):
raise ValueError("Passwords cannot contain spaces.")
if len(pw) < 4:
raise ValueError("Passwords must be at least four characters.")
if __name__ == "__main__":
import sys
if len(sys.argv) > 2 and sys.argv[1] == "validate-email":
# Validate that we can create a Dovecot account for a given string.
if validate_email(sys.argv[2], mode='user'):
sys.exit(0)
else:
sys.exit(1)
if len(sys.argv) > 1 and sys.argv[1] == "update":
from utils import load_environment
print(kick(load_environment()))