mailinabox/management/daemon.py

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import os, os.path, re, json, time
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import subprocess
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from functools import wraps
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from flask import Flask, request, render_template, abort, Response, send_from_directory, make_response
import auth, utils, multiprocessing.pool
from mailconfig import get_mail_users, get_mail_users_ex, get_admins, add_mail_user, set_mail_password, remove_mail_user
from mailconfig import get_mail_user_privileges, add_remove_mail_user_privilege, open_database
from mailconfig import get_mail_aliases, get_mail_aliases_ex, get_mail_domains, add_mail_alias, remove_mail_alias
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env = utils.load_environment()
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auth_service = auth.KeyAuthService()
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# We may deploy via a symbolic link, which confuses flask's template finding.
me = __file__
try:
me = os.readlink(__file__)
except OSError:
pass
# for generating CSRs we need a list of country codes
csr_country_codes = []
with open(os.path.join(os.path.dirname(me), "csr_country_codes.tsv")) as f:
for line in f:
if line.strip() == "" or line.startswith("#"): continue
code, name = line.strip().split("\t")[0:2]
csr_country_codes.append((code, name))
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app = Flask(__name__, template_folder=os.path.abspath(os.path.join(os.path.dirname(me), "templates")))
# Decorator to protect views that require a user with 'admin' privileges.
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def authorized_personnel_only(viewfunc):
@wraps(viewfunc)
def newview(*args, **kwargs):
# Authenticate the passed credentials, which is either the API key or a username:password pair.
error = None
try:
email, privs = auth_service.authenticate(request, env)
except ValueError as e:
# Authentication failed.
privs = []
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error = "Incorrect username or password"
# Write a line in the log recording the failed login
log_failed_login(request)
# Authorized to access an API view?
if "admin" in privs:
# Call view func.
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return viewfunc(*args, **kwargs)
elif not error:
error = "You are not an administrator."
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# Not authorized. Return a 401 (send auth) and a prompt to authorize by default.
status = 401
headers = {
'WWW-Authenticate': 'Basic realm="{0}"'.format(auth_service.auth_realm),
'X-Reason': error,
}
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if request.headers.get('X-Requested-With') == 'XMLHttpRequest':
# Don't issue a 401 to an AJAX request because the user will
# be prompted for credentials, which is not helpful.
status = 403
headers = None
if request.headers.get('Accept') in (None, "", "*/*"):
# Return plain text output.
return Response(error+"\n", status=status, mimetype='text/plain', headers=headers)
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else:
# Return JSON output.
return Response(json.dumps({
"status": "error",
"reason": error,
})+"\n", status=status, mimetype='application/json', headers=headers)
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return newview
@app.errorhandler(401)
def unauthorized(error):
return auth_service.make_unauthorized_response()
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def json_response(data):
return Response(json.dumps(data, indent=2, sort_keys=True)+'\n', status=200, mimetype='application/json')
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###################################
# Control Panel (unauthenticated views)
@app.route('/')
def index():
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# Render the control panel. This route does not require user authentication
# so it must be safe!
no_users_exist = (len(get_mail_users(env)) == 0)
no_admins_exist = (len(get_admins(env)) == 0)
utils.fix_boto() # must call prior to importing boto
import boto.s3
backup_s3_hosts = [(r.name, r.endpoint) for r in boto.s3.regions()]
lsb=utils.shell("check_output", ["/usr/bin/lsb_release", "-d"])
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return render_template('index.html',
hostname=env['PRIMARY_HOSTNAME'],
distname=lsb[lsb.find("\t")+1:-1],
storage_root=env['STORAGE_ROOT'],
no_users_exist=no_users_exist,
no_admins_exist=no_admins_exist,
backup_s3_hosts=backup_s3_hosts,
csr_country_codes=csr_country_codes,
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)
@app.route('/me')
def me():
# Is the caller authorized?
try:
email, privs = auth_service.authenticate(request, env)
except ValueError as e:
# Log the failed login
log_failed_login(request)
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return json_response({
"status": "invalid",
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"reason": "Incorrect username or password",
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})
resp = {
"status": "ok",
"email": email,
"privileges": privs,
}
# Is authorized as admin? Return an API key for future use.
if "admin" in privs:
resp["api_key"] = auth_service.create_user_key(email, env)
# Return.
return json_response(resp)
# MAIL
@app.route('/mail/users')
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@authorized_personnel_only
def mail_users():
if request.args.get("format", "") == "json":
return json_response(get_mail_users_ex(env, with_archived=True))
else:
return "".join(x+"\n" for x in get_mail_users(env))
@app.route('/mail/users/add', methods=['POST'])
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@authorized_personnel_only
def mail_users_add():
try:
return add_mail_user(request.form.get('email', ''), request.form.get('password', ''), request.form.get('privileges', ''), env)
except ValueError as e:
return (str(e), 400)
@app.route('/mail/users/password', methods=['POST'])
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@authorized_personnel_only
def mail_users_password():
try:
return set_mail_password(request.form.get('email', ''), request.form.get('password', ''), env)
except ValueError as e:
return (str(e), 400)
@app.route('/mail/users/remove', methods=['POST'])
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@authorized_personnel_only
def mail_users_remove():
return remove_mail_user(request.form.get('email', ''), env)
@app.route('/mail/users/privileges')
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@authorized_personnel_only
def mail_user_privs():
privs = get_mail_user_privileges(request.args.get('email', ''), env)
if isinstance(privs, tuple): return privs # error
return "\n".join(privs)
@app.route('/mail/users/privileges/add', methods=['POST'])
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@authorized_personnel_only
def mail_user_privs_add():
return add_remove_mail_user_privilege(request.form.get('email', ''), request.form.get('privilege', ''), "add", env)
@app.route('/mail/users/privileges/remove', methods=['POST'])
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@authorized_personnel_only
def mail_user_privs_remove():
return add_remove_mail_user_privilege(request.form.get('email', ''), request.form.get('privilege', ''), "remove", env)
@app.route('/mail/aliases')
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@authorized_personnel_only
def mail_aliases():
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if request.args.get("format", "") == "json":
return json_response(get_mail_aliases_ex(env))
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else:
return "".join(address+"\t"+receivers+"\t"+(senders or "")+"\n" for address, receivers, senders in get_mail_aliases(env))
@app.route('/mail/aliases/add', methods=['POST'])
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@authorized_personnel_only
def mail_aliases_add():
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return add_mail_alias(
request.form.get('address', ''),
request.form.get('forwards_to', ''),
request.form.get('permitted_senders', ''),
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env,
update_if_exists=(request.form.get('update_if_exists', '') == '1')
)
@app.route('/mail/aliases/remove', methods=['POST'])
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@authorized_personnel_only
def mail_aliases_remove():
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return remove_mail_alias(request.form.get('address', ''), env)
@app.route('/mail/domains')
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@authorized_personnel_only
def mail_domains():
return "".join(x+"\n" for x in get_mail_domains(env))
# DNS
@app.route('/dns/zones')
@authorized_personnel_only
def dns_zones():
from dns_update import get_dns_zones
return json_response([z[0] for z in get_dns_zones(env)])
@app.route('/dns/update', methods=['POST'])
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@authorized_personnel_only
def dns_update():
from dns_update import do_dns_update
try:
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return do_dns_update(env, force=request.form.get('force', '') == '1')
except Exception as e:
return (str(e), 500)
@app.route('/dns/secondary-nameserver')
@authorized_personnel_only
def dns_get_secondary_nameserver():
from dns_update import get_custom_dns_config, get_secondary_dns
return json_response({ "hostnames": get_secondary_dns(get_custom_dns_config(env), mode=None) })
@app.route('/dns/secondary-nameserver', methods=['POST'])
@authorized_personnel_only
def dns_set_secondary_nameserver():
from dns_update import set_secondary_dns
try:
return set_secondary_dns([ns.strip() for ns in re.split(r"[, ]+", request.form.get('hostnames') or "") if ns.strip() != ""], env)
except ValueError as e:
return (str(e), 400)
@app.route('/dns/custom')
@authorized_personnel_only
def dns_get_records(qname=None, rtype=None):
from dns_update import get_custom_dns_config
return json_response([
{
"qname": r[0],
"rtype": r[1],
"value": r[2],
}
for r in get_custom_dns_config(env)
if r[0] != "_secondary_nameserver"
and (not qname or r[0] == qname)
and (not rtype or r[1] == rtype) ])
@app.route('/dns/custom/<qname>', methods=['GET', 'POST', 'PUT', 'DELETE'])
@app.route('/dns/custom/<qname>/<rtype>', methods=['GET', 'POST', 'PUT', 'DELETE'])
@authorized_personnel_only
def dns_set_record(qname, rtype="A"):
from dns_update import do_dns_update, set_custom_dns_record
try:
# Normalize.
rtype = rtype.upper()
# Read the record value from the request BODY, which must be
# ASCII-only. Not used with GET.
value = request.stream.read().decode("ascii", "ignore").strip()
if request.method == "GET":
# Get the existing records matching the qname and rtype.
return dns_get_records(qname, rtype)
elif request.method in ("POST", "PUT"):
# There is a default value for A/AAAA records.
if rtype in ("A", "AAAA") and value == "":
value = request.environ.get("HTTP_X_FORWARDED_FOR") # normally REMOTE_ADDR but we're behind nginx as a reverse proxy
# Cannot add empty records.
if value == '':
return ("No value for the record provided.", 400)
if request.method == "POST":
# Add a new record (in addition to any existing records
# for this qname-rtype pair).
action = "add"
elif request.method == "PUT":
# In REST, PUT is supposed to be idempotent, so we'll
# make this action set (replace all records for this
# qname-rtype pair) rather than add (add a new record).
action = "set"
elif request.method == "DELETE":
if value == '':
# Delete all records for this qname-type pair.
value = None
else:
# Delete just the qname-rtype-value record exactly.
pass
action = "remove"
if set_custom_dns_record(qname, rtype, value, action, env):
return do_dns_update(env) or "Something isn't right."
return "OK"
except ValueError as e:
return (str(e), 400)
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@app.route('/dns/dump')
@authorized_personnel_only
def dns_get_dump():
from dns_update import build_recommended_dns
return json_response(build_recommended_dns(env))
# SSL
@app.route('/ssl/status')
@authorized_personnel_only
def ssl_get_status():
from ssl_certificates import get_certificates_to_provision
from web_update import get_web_domains_info, get_web_domains
# What domains can we provision certificates for? What unexpected problems do we have?
provision, cant_provision = get_certificates_to_provision(env, show_valid_certs=False)
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# What's the current status of TLS certificates on all of the domain?
domains_status = get_web_domains_info(env)
domains_status = [
{
"domain": d["domain"],
"status": d["ssl_certificate"][0],
"text": d["ssl_certificate"][1] + ((" " + cant_provision[d["domain"]] if d["domain"] in cant_provision else ""))
} for d in domains_status ]
# Warn the user about domain names not hosted here because of other settings.
for domain in set(get_web_domains(env, exclude_dns_elsewhere=False)) - set(get_web_domains(env)):
domains_status.append({
"domain": domain,
"status": "not-applicable",
"text": "The domain's website is hosted elsewhere.",
})
return json_response({
"can_provision": utils.sort_domains(provision, env),
"status": domains_status,
})
@app.route('/ssl/csr/<domain>', methods=['POST'])
@authorized_personnel_only
def ssl_get_csr(domain):
from ssl_certificates import create_csr
ssl_private_key = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_private_key.pem'))
return create_csr(domain, ssl_private_key, request.form.get('countrycode', ''), env)
@app.route('/ssl/install', methods=['POST'])
@authorized_personnel_only
def ssl_install_cert():
from web_update import get_web_domains
from ssl_certificates import install_cert
domain = request.form.get('domain')
ssl_cert = request.form.get('cert')
ssl_chain = request.form.get('chain')
if domain not in get_web_domains(env):
return "Invalid domain name."
return install_cert(domain, ssl_cert, ssl_chain, env)
@app.route('/ssl/provision', methods=['POST'])
@authorized_personnel_only
def ssl_provision_certs():
from ssl_certificates import provision_certificates
requests = provision_certificates(env, limit_domains=None)
return json_response({ "requests": requests })
# WEB
@app.route('/web/domains')
@authorized_personnel_only
def web_get_domains():
from web_update import get_web_domains_info
return json_response(get_web_domains_info(env))
@app.route('/web/update', methods=['POST'])
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@authorized_personnel_only
def web_update():
from web_update import do_web_update
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try:
return do_web_update(env)
except Exception as e:
return (str(e), 500)
# System
@app.route('/system/version', methods=["GET"])
@authorized_personnel_only
def system_version():
from status_checks import what_version_is_this
try:
return what_version_is_this(env)
except Exception as e:
return (str(e), 500)
@app.route('/system/latest-upstream-version', methods=["POST"])
@authorized_personnel_only
def system_latest_upstream_version():
from status_checks import get_latest_miab_version
try:
return get_latest_miab_version()
except Exception as e:
return (str(e), 500)
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@app.route('/system/status', methods=["POST"])
@authorized_personnel_only
def system_status():
from status_checks import run_checks
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class WebOutput:
def __init__(self):
self.items = []
def add_heading(self, heading):
self.items.append({ "type": "heading", "text": heading, "extra": [] })
def print_ok(self, message):
self.items.append({ "type": "ok", "text": message, "extra": [] })
def print_error(self, message):
self.items.append({ "type": "error", "text": message, "extra": [] })
def print_warning(self, message):
self.items.append({ "type": "warning", "text": message, "extra": [] })
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def print_line(self, message, monospace=False):
self.items[-1]["extra"].append({ "text": message, "monospace": monospace })
output = WebOutput()
# Create a temporary pool of processes for the status checks
with multiprocessing.pool.Pool(processes=5) as pool:
run_checks(False, env, output, pool)
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return json_response(output.items)
@app.route('/system/updates')
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@authorized_personnel_only
def show_updates():
from status_checks import list_apt_updates
return "".join(
"%s (%s)\n"
% (p["package"], p["version"])
for p in list_apt_updates())
@app.route('/system/update-packages', methods=["POST"])
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@authorized_personnel_only
def do_updates():
utils.shell("check_call", ["/usr/bin/apt-get", "-qq", "update"])
return utils.shell("check_output", ["/usr/bin/apt-get", "-y", "upgrade"], env={
"DEBIAN_FRONTEND": "noninteractive"
})
@app.route('/system/reboot', methods=["GET"])
@authorized_personnel_only
def needs_reboot():
from status_checks import is_reboot_needed_due_to_package_installation
if is_reboot_needed_due_to_package_installation():
return json_response(True)
else:
return json_response(False)
@app.route('/system/reboot', methods=["POST"])
@authorized_personnel_only
def do_reboot():
# To keep the attack surface low, we don't allow a remote reboot if one isn't necessary.
from status_checks import is_reboot_needed_due_to_package_installation
if is_reboot_needed_due_to_package_installation():
return utils.shell("check_output", ["/sbin/shutdown", "-r", "now"], capture_stderr=True)
else:
return "No reboot is required, so it is not allowed."
@app.route('/system/backup/status')
@authorized_personnel_only
def backup_status():
from backup import backup_status
try:
return json_response(backup_status(env))
except Exception as e:
return json_response({ "error": str(e) })
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@app.route('/system/backup/config', methods=["GET"])
@authorized_personnel_only
def backup_get_custom():
from backup import get_backup_config
return json_response(get_backup_config(env, for_ui=True))
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@app.route('/system/backup/config', methods=["POST"])
@authorized_personnel_only
def backup_set_custom():
from backup import backup_set_custom
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return json_response(backup_set_custom(env,
request.form.get('target', ''),
request.form.get('target_user', ''),
request.form.get('target_pass', ''),
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request.form.get('min_age', '')
))
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@app.route('/system/backup/new', methods=["POST"])
@authorized_personnel_only
def backup_new():
from backup import perform_backup, get_backup_config
# If backups are disabled, don't perform the backup
config = get_backup_config(env)
if config["target"] == "off":
return "Backups are disabled in this machine. Nothing was done."
msg = perform_backup(request.form.get('full', False) == 'true', True)
return "OK" if msg is None else msg
@app.route('/system/privacy', methods=["GET"])
@authorized_personnel_only
def privacy_status_get():
config = utils.load_settings(env)
return json_response(config.get("privacy", True))
@app.route('/system/privacy', methods=["POST"])
@authorized_personnel_only
def privacy_status_set():
config = utils.load_settings(env)
config["privacy"] = (request.form.get('value') == "private")
utils.write_settings(config, env)
return "OK"
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@app.route('/system/smtp/relay', methods=["GET"])
@authorized_personnel_only
def smtp_relay_get():
config = utils.load_settings(env)
return {
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"enabled": config.get("SMTP_RELAY_ENABLED", True),
"host": config.get("SMTP_RELAY_HOST", ""),
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"auth_enabled": config.get("SMTP_RELAY_AUTH", False),
"user": config.get("SMTP_RELAY_USER", "")
}
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@app.route('/system/smtp/relay', methods=["POST"])
@authorized_personnel_only
def smtp_relay_set():
from editconf import edit_conf
config = utils.load_settings(env)
newconf = request.form
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try:
# Write on daemon settings
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config["SMTP_RELAY_ENABLED"] = (newconf.get("enabled") == "true")
config["SMTP_RELAY_HOST"] = newconf.get("host")
config["SMTP_RELAY_AUTH"] = (newconf.get("auth_enabled") == "true")
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config["SMTP_RELAY_USER"] = newconf.get("user")
utils.write_settings(config, env)
# Write on Postfix configs
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edit_conf("/etc/postfix/main.cf", [
"relayhost=" + (f"[{config['SMTP_RELAY_HOST']}]:587" if config["SMTP_RELAY_ENABLED"] else ""),
"smtp_sasl_auth_enable=" + ("yes" if config["SMTP_RELAY_AUTH"] else "no"),
"smtp_sasl_security_options=" + ("noanonymous" if config["SMTP_RELAY_AUTH"] else "anonymous"),
"smtp_sasl_tls_security_options=" + ("noanonymous" if config["SMTP_RELAY_AUTH"] else "anonymous")
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], delimiter_re=r"\s*=\s*", delimiter="=", comment_char="#")
if config["SMTP_RELAY_AUTH"]:
# Edit the sasl password
with open("/etc/postfix/sasl_passwd", "w") as f:
f.write(f"[{config['SMTP_RELAY_HOST']}]:587 {config['SMTP_RELAY_USER']}:{newconf.get('key')}\n")
utils.shell("check_output", ["/usr/bin/chmod", "600", "/etc/postfix/sasl_passwd"], capture_stderr=True)
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utils.shell("check_output", ["/usr/sbin/postmap", "/etc/postfix/sasl_passwd"], capture_stderr=True)
# Restart Postfix
return utils.shell("check_output", ["/usr/bin/systemctl", "restart", "postfix"], capture_stderr=True)
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except Exception as e:
return (str(e), 500)
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# MUNIN
@app.route('/munin/')
@app.route('/munin/<path:filename>')
@authorized_personnel_only
def munin(filename=""):
# Checks administrative access (@authorized_personnel_only) and then just proxies
# the request to static files.
if filename == "": filename = "index.html"
return send_from_directory("/var/cache/munin/www", filename)
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@app.route('/munin/cgi-graph/<path:filename>')
@authorized_personnel_only
def munin_cgi(filename):
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""" Relay munin cgi dynazoom requests
/usr/lib/munin/cgi/munin-cgi-graph is a perl cgi script in the munin package
that is responsible for generating binary png images _and_ associated HTTP
headers based on parameters in the requesting URL. All output is written
to stdout which munin_cgi splits into response headers and binary response
data.
munin-cgi-graph reads environment variables to determine
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what it should do. It expects a path to be in the env-var PATH_INFO, and a
querystring to be in the env-var QUERY_STRING.
munin-cgi-graph has several failure modes. Some write HTTP Status headers and
others return nonzero exit codes.
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Situating munin_cgi between the user-agent and munin-cgi-graph enables keeping
the cgi script behind mailinabox's auth mechanisms and avoids additional
support infrastructure like spawn-fcgi.
"""
COMMAND = 'su - munin --preserve-environment --shell=/bin/bash -c /usr/lib/munin/cgi/munin-cgi-graph'
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# su changes user, we use the munin user here
# --preserve-environment retains the environment, which is where Popen's `env` data is
# --shell=/bin/bash ensures the shell used is bash
# -c "/usr/lib/munin/cgi/munin-cgi-graph" passes the command to run as munin
# "%s" is a placeholder for where the request's querystring will be added
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if filename == "":
return ("a path must be specified", 404)
query_str = request.query_string.decode("utf-8", 'ignore')
env = {'PATH_INFO': '/%s/' % filename, 'REQUEST_METHOD': 'GET', 'QUERY_STRING': query_str}
code, binout = utils.shell('check_output',
COMMAND.split(" ", 5),
# Using a maxsplit of 5 keeps the last arguments together
env=env,
return_bytes=True,
trap=True)
if code != 0:
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# nonzero returncode indicates error
app.logger.error("munin_cgi: munin-cgi-graph returned nonzero exit code, %s", code)
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return ("error processing graph image", 500)
# /usr/lib/munin/cgi/munin-cgi-graph returns both headers and binary png when successful.
# A double-Windows-style-newline always indicates the end of HTTP headers.
headers, image_bytes = binout.split(b'\r\n\r\n', 1)
response = make_response(image_bytes)
for line in headers.splitlines():
name, value = line.decode("utf8").split(':', 1)
response.headers[name] = value
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if 'Status' in response.headers and '404' in response.headers['Status']:
app.logger.warning("munin_cgi: munin-cgi-graph returned 404 status code. PATH_INFO=%s", env['PATH_INFO'])
return response
def log_failed_login(request):
# We need to figure out the ip to list in the message, all our calls are routed
# through nginx who will put the original ip in X-Forwarded-For.
# During setup we call the management interface directly to determine the user
# status. So we can't always use X-Forwarded-For because during setup that header
# will not be present.
if request.headers.getlist("X-Forwarded-For"):
ip = request.headers.getlist("X-Forwarded-For")[0]
else:
ip = request.remote_addr
# We need to add a timestamp to the log message, otherwise /dev/log will eat the "duplicate"
# message.
app.logger.warning( "Mail-in-a-Box Management Daemon: Failed login attempt from ip %s - timestamp %s" % (ip, time.time()))
# APP
if __name__ == '__main__':
if "DEBUG" in os.environ: app.debug = True
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if "APIKEY" in os.environ: auth_service.key = os.environ["APIKEY"]
if not app.debug:
app.logger.addHandler(utils.create_syslog_handler())
# For testing on the command line, you can use `curl` like so:
# curl --user $(</var/lib/mailinabox/api.key): http://localhost:10222/mail/users
auth_service.write_key()
# For testing in the browser, you can copy the API key that's output to the
# debug console and enter that as the username
app.logger.info('API key: ' + auth_service.key)
# Start the application server. Listens on 127.0.0.1 (IPv4 only).
app.run(port=10222)