pgsql/set-permissions.py
author Pascal Volk <user@localhost.localdomain.org>
Sun, 02 Dec 2012 14:54:24 +0000
branchv0.7.x
changeset 657 6515e3b88dec
parent 645 fcc3f100e56a
child 693 2e19ab98118a
permissions -rw-r--r--
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#!/usr/bin/env python3
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# coding: utf-8
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# Copyright 2012, Pascal Volk
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# See COPYING for distribution information.
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"""
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    Use this script in order to set database permissions for your Dovecot
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    and Postfix database users.
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    Run `python set-permissions.py -h` for details.
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"""
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import getpass
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import sys
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from optparse import OptionParser
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has_psycopg2 = False
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try:
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    import psycopg2
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    has_psycopg2 = True
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except ImportError:
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    try:
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        from pyPgSQL import PgSQL
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    except ImportError:
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        sys.stderr.write('error: no suitable database module found\n')
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        raise SystemExit(1)
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if has_psycopg2:
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    DBErr = psycopg2.DatabaseError
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else:
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    DBErr = PgSQL.libpq.DatabaseError
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def check_opts(opts, err_hdlr):
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    if not opts.postfix:
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        err_hdlr('missing Postfix database user name')
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    if not opts.dovecot:
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        err_hdlr('missing Dovecot database user name')
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    if opts.askp:
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        opts.dbpass = getpass.getpass()
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def get_dbh(database, user, password, host, port):
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    if has_psycopg2:
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        return psycopg2.connect(database=database, user=user,
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                                password=password, host=host, port=port)
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    return PgSQL.connect(user=user, password=password, host=host,
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                         database=database, port=port)
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def get_optparser():
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    descr = 'Set permissions for Dovecot and Postfix in the vmm database.'
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    usage = 'usage: %prog OPTIONS'
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    parser = OptionParser(description=descr, usage=usage)
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    parser.add_option('-a', '--askpass', dest='askp', default=False,
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            action='store_true', help='Prompt for the database password.')
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    parser.add_option('-H', '--host', dest='host', metavar='HOST',
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            default=None,
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            help='Hostname or IP address of the database server. Leave ' +
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                 'blank in order to use the default Unix-domain socket.')
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    parser.add_option('-n', '--name', dest='name', metavar='NAME',
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            default='mailsys',
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            help='Specifies the name of the database to connect to. ' +
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                 'Default: %default')
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    parser.add_option('-p', '--pass', dest="dbpass", metavar='PASS',
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            default=None, help='Password for the database connection.')
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    parser.add_option('-P', '--port', dest='port', metavar='PORT', type='int',
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            default=5432,
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            help='Specifies the TCP port or the local Unix-domain socket ' +
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                 'file extension on which the server is listening for ' +
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                 'connections. Default: %default')
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    parser.add_option('-U', '--user', dest='user', metavar='USER',
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            default=getpass.getuser(),
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            help='Connect to the database as the user USER instead of the ' +
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                 'default: %default')
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    parser.add_option('-D', '--dovecot', dest='dovecot', metavar='USER',
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            default='dovecot',
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            help='Database user name of the Dovecot database user. Default: ' +
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                 '%default')
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    parser.add_option('-M', '--postfix', dest='postfix', metavar='USER',
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            default='postfix',
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            help='Database user name of the Postfix (MTA)  database user. ' +
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                 'Default: %default')
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    return parser
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def set_permissions(dbh, dc_vers, dovecot, postfix):
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    dc_rw = ('userquota_11', 'userquota')[dc_vers == 12]
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    dbc = dbh.cursor()
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    dbc.execute('GRANT SELECT ON domain_data, domain_name, mailboxformat, '
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                'maillocation, quotalimit, service_set, users TO %s' % dovecot)
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    dbc.execute('GRANT SELECT, INSERT, UPDATE, DELETE ON %s TO %s' %
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                (dc_rw, dovecot))
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    dbc.execute('GRANT SELECT ON alias, catchall, domain_data, domain_name, '
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                'maillocation, postfix_gid, relocated, transport, users TO %s'
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                % postfix)
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    dbc.close()
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def set_permissions84(dbh, dc_vers, dovecot, postfix):
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    dc_rw_tbls = ('userquota_11', 'userquota')[dc_vers == 12]
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    dc_ro_tbls = 'mailboxformat, maillocation, service_set, quotalimit'
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    pf_ro_tbls = 'alias, catchall, postfix_gid, relocated, transport'
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    db = dict(dovecot=dovecot, postfix=postfix)
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    db['dovecot_tbls'] = {
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        'domain_data': 'domaindir, gid, qid, ssid',
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        'domain_name': 'domainname, gid',
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        'users': 'gid, local_part, mid, passwd, qid, ssid, uid',
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    }
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    db['postfix_tbls'] = {
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        'domain_data': 'domaindir, gid, tid',
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        'domain_name': 'domainname, gid',
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        'maillocation': 'directory, mid',
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        'users': 'gid, local_part, mid, tid, uid',
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    }
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    dbc = dbh.cursor()
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    dbc.execute('GRANT SELECT, INSERT, UPDATE, DELETE ON %s TO %s' %
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                (dc_rw_tbls, db['dovecot']))
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    dbc.execute('GRANT SELECT ON %s TO %s' % (dc_ro_tbls, db['dovecot']))
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    dbc.execute('GRANT SELECT ON %s TO %s' % (pf_ro_tbls, db['postfix']))
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    for table, columns in db['dovecot_tbls'].items():
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        dbc.execute('GRANT SELECT (%s) ON %s TO %s' % (columns, table,
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                                                       db['dovecot']))
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    for table, columns in db['postfix_tbls'].items():
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        dbc.execute('GRANT SELECT (%s) ON %s TO %s' % (columns, table,
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                                                       db['postfix']))
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    dbc.close()
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def set_versions(dbh, versions):
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    dbc = dbh.cursor()
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    if hasattr(dbh, 'server_version'):
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        versions['pgsql'] = dbh.server_version
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    else:
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        try:
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            dbc.execute("SELECT current_setting('server_version_num')")
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            versions['pgsql'] = int(dbc.fetchone()[0])
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        except DBErr:
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            versions['pgsql'] = 80199
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    dbc.execute("SELECT relname FROM pg_stat_user_tables WHERE relname LIKE "
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                "'userquota%'")
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    res = dbc.fetchall()
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    dbc.close()
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    tbls = [tbl[0] for tbl in res]
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    if 'userquota' in tbls:
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        versions['dovecot'] = 12
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    elif 'userquota_11' in tbls:
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        versions['dovecot'] = 11
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    else:
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        sys.stderr.write('error: no userquota table found\nis "' + dbh.dsn +
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                         '" correct? is the database up to date?\n')
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        dbh.close()
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        raise SystemExit(1)
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if __name__ == '__main__':
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    optparser = get_optparser()
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    opts, args = optparser.parse_args()
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    check_opts(opts, optparser.error)
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    dbh = get_dbh(opts.name, opts.user, opts.dbpass, opts.host, opts.port)
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    versions = {}
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    set_versions(dbh, versions)
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    if versions['pgsql'] < 80400:
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        set_permissions(dbh, versions['dovecot'], opts.dovecot, opts.postfix)
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    else:
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        set_permissions84(dbh, versions['dovecot'], opts.dovecot, opts.postfix)
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    dbh.commit()
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    dbh.close()