# Authors: Simo Sorce # # Copyright (C) 2007 Red Hat # see file 'COPYING' for use and warranty information # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # import logging import socket import errno import getpass import os import re import fileinput import sys import struct import fcntl import netaddr from ipapython import ipautil from ipapython import dnsclient def get_fqdn(): fqdn = "" try: fqdn = socket.getfqdn() except: try: fqdn = socket.gethostname() except: fqdn = "" return fqdn def verify_dns_records(host_name, responses, resaddr, family): familykw = { 'ipv4' : { 'dns_type' : dnsclient.DNS_T_A, 'socket_family' : socket.AF_INET, }, 'ipv6' : { 'dns_type' : dnsclient.DNS_T_AAAA, 'socket_family' : socket.AF_INET6, }, } family = family.lower() if family not in familykw.keys(): raise RuntimeError("Unknown faimily %s\n" % family) rec = None for rsn in responses: if rsn.dns_type == familykw[family]['dns_type']: rec = rsn break if rec == None: raise IOError(errno.ENOENT, "Warning: Hostname (%s) not found in DNS" % host_name) if family == 'ipv4': familykw[family]['address'] = socket.inet_ntop(socket.AF_INET, struct.pack('!L',rec.rdata.address)) else: familykw[family]['address'] = socket.inet_ntop(socket.AF_INET6, struct.pack('!16B', *rec.rdata.address)) # Check that DNS address is the same is address returned via standard glibc calls dns_addr = netaddr.IPAddress(familykw[family]['address']) if dns_addr.format() != resaddr: raise RuntimeError("The network address %s does not match the DNS lookup %s. Check /etc/hosts and ensure that %s is the IP address for %s" % (dns_addr.format(), resaddr, dns_addr.format(), host_name)) rs = dnsclient.query(dns_addr.reverse_dns, dnsclient.DNS_C_IN, dnsclient.DNS_T_PTR) if len(rs) == 0: raise RuntimeError("Cannot find Reverse Address for %s (%s)" % (host_name, dns_addr.format())) rev = None for rsn in rs: if rsn.dns_type == dnsclient.DNS_T_PTR: rev = rsn break if rev == None: raise RuntimeError("Cannot find Reverse Address for %s (%s)" % (host_name, dns_addr.format())) if rec.dns_name != rev.rdata.ptrdname: raise RuntimeError("The DNS forward record %s does not match the reverse address %s" % (rec.dns_name, rev.rdata.ptrdname)) def verify_fqdn(host_name,no_host_dns=False): if len(host_name.split(".")) < 2 or host_name == "localhost.localdomain": raise RuntimeError("Invalid hostname '%s', must be fully-qualified." % host_name) try: hostaddr = socket.getaddrinfo(host_name, None) except: raise RuntimeError("Unable to resolve host name, check /etc/hosts or DNS name resolution") if len(hostaddr) == 0: raise RuntimeError("Unable to resolve host name, check /etc/hosts or DNS name resolution") for a in hostaddr: if a[4][0] == '127.0.0.1' or a[4][0] == '::1': raise RuntimeError("The IPA Server hostname cannot resolve to localhost (%s). A routable IP address must be used. Check /etc/hosts to see if %s is an alias for %s" % (a[4][0], host_name, a[4][0])) try: resaddr = a[4][0] revname = socket.gethostbyaddr(a[4][0])[0] except: raise RuntimeError("Unable to resolve the reverse ip address, check /etc/hosts or DNS name resolution") if revname != host_name: raise RuntimeError("The host name %s does not match the reverse lookup %s" % (host_name, revname)) if no_host_dns: print "Warning: skipping DNS resolution of host", host_name return # Verify this is NOT a CNAME rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_CNAME) if len(rs) != 0: for rsn in rs: if rsn.dns_type == dnsclient.DNS_T_CNAME: raise RuntimeError("The IPA Server Hostname cannot be a CNAME, only A and AAAA names are allowed.") # Verify that it is a DNS A or AAAA record rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_A) if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0: verify_dns_records(host_name, rs, resaddr, 'ipv4') return rs = dnsclient.query(host_name+".", dnsclient.DNS_C_IN, dnsclient.DNS_T_AAAA) if len([ rec for rec in rs if rec.dns_type is not dnsclient.DNS_T_SOA ]) > 0: verify_dns_records(host_name, rs, resaddr, 'ipv6') return else: print "Warning: Hostname (%s) not found in DNS" % host_name def verify_ip_address(ip): is_ok = True try: socket.inet_pton(socket.AF_INET, ip) except: try: socket.inet_pton(socket.AF_INET6, ip) except: print "Unable to verify IP address" is_ok = False return is_ok def record_in_hosts(ip, host_name, file="/etc/hosts"): hosts = open(file, 'r').readlines() for line in hosts: line = line.rstrip('\n') fields = line.partition('#')[0].split() if len(fields) == 0: continue try: hosts_ip = fields[0] names = fields[1:] if hosts_ip != ip: continue if host_name in names: return True except IndexError: print "Warning: Erroneous line '%s' in %s" % (line, file) continue return False def add_record_to_hosts(ip, host_name, file="/etc/hosts"): hosts_fd = open(file, 'r+') hosts_fd.seek(0, 2) hosts_fd.write(ip+'\t'+host_name+' '+host_name.split('.')[0]+'\n') hosts_fd.close() def read_ip_address(host_name, fstore): while True: ip = ipautil.user_input("Please provide the IP address to be used for this host name", allow_empty = False) if ip == "127.0.0.1" or ip == "::1": print "The IPA Server can't use localhost as a valid IP" continue if verify_ip_address(ip): break print "Adding ["+ip+" "+host_name+"] to your /etc/hosts file" fstore.backup_file("/etc/hosts") add_record_to_hosts(ip, host_name) return ip def read_dns_forwarders(): addrs = [] if ipautil.user_input("Do you want to configure DNS forwarders?", True): print "Enter the IP address of DNS forwarder to use, or press Enter to finish." while True: ip = ipautil.user_input("Enter IP address for a DNS forwarder", allow_empty=True) if not ip: break if ip == "127.0.0.1" or ip == "::1": print "You cannot use localhost as a DNS forwarder" continue if not verify_ip_address(ip): print "DNS forwarder %s not added" % ip continue print "DNS forwarder %s added" % ip addrs.append(ip) if not addrs: print "No DNS forwarders configured" return addrs def port_available(port): """Try to bind to a port on the wildcard host Return 1 if the port is available Return 0 if the port is in use """ rv = 1 try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) fcntl.fcntl(s, fcntl.F_SETFD, fcntl.FD_CLOEXEC) s.bind(('', port)) s.close() except socket.error, e: if e[0] == errno.EADDRINUSE: rv = 0 if rv: try: s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) fcntl.fcntl(s, fcntl.F_SETFD, fcntl.FD_CLOEXEC) s.bind(('', port)) s.close() except socket.error, e: if e[0] == errno.EADDRINUSE: rv = 0 return rv def standard_logging_setup(log_filename, debug=False, filemode='w'): old_umask = os.umask(077) # Always log everything (i.e., DEBUG) to the log # file. logging.basicConfig(level=logging.DEBUG, format='%(asctime)s %(levelname)s %(message)s', filename=log_filename, filemode=filemode) os.umask(old_umask) console = logging.StreamHandler() # If the debug option is set, also log debug messages to the console if debug: console.setLevel(logging.DEBUG) else: # Otherwise, log critical and error messages console.setLevel(logging.ERROR) formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s') console.setFormatter(formatter) logging.getLogger('').addHandler(console) def get_password(prompt): if os.isatty(sys.stdin.fileno()): return getpass.getpass(prompt) else: return sys.stdin.readline().rstrip() def read_password(user, confirm=True, validate=True): correct = False pwd = "" while not correct: pwd = get_password(user + " password: ") if not pwd: continue if validate and len(pwd) < 8: print "Password must be at least 8 characters long" continue if not confirm: correct = True continue pwd_confirm = get_password("Password (confirm): ") if pwd != pwd_confirm: print "Password mismatch!" print "" else: correct = True print "" return pwd def update_file(filename, orig, subst): if os.path.exists(filename): st = os.stat(filename) pattern = "%s" % re.escape(orig) p = re.compile(pattern) for line in fileinput.input(filename, inplace=1): if not p.search(line): sys.stdout.write(line) else: sys.stdout.write(p.sub(subst, line)) fileinput.close() os.chown(filename, st.st_uid, st.st_gid) # reset perms return 0 else: print "File %s doesn't exist." % filename return 1 def set_directive(filename, directive, value, quotes=True, separator=' '): """Set a name/value pair directive in a configuration file. This has only been tested with nss.conf """ valueset = False st = os.stat(filename) fd = open(filename) newfile = [] for line in fd: if directive in line: valueset = True if quotes: newfile.append('%s%s"%s"\n' % (directive, separator, value)) else: newfile.append('%s%s%s\n' % (directive, separator, value)) else: newfile.append(line) fd.close() if not valueset: if quotes: newfile.append('%s%s"%s"\n' % (directive, separator, value)) else: newfile.append('%s%s%s\n' % (directive, separator, value)) fd = open(filename, "w") fd.write("".join(newfile)) fd.close() os.chown(filename, st.st_uid, st.st_gid) # reset perms def get_directive(filename, directive, separator=' '): """ A rather inefficient way to get a configuration directive. """ fd = open(filename, "r") for line in fd: if directive in line: line = line.strip() result = line.split(separator, 1)[1] result = result.strip('"') result = result.strip(' ') fd.close() return result fd.close() return None def kadmin(command): ipautil.run(["kadmin.local", "-q", command]) def kadmin_addprinc(principal): kadmin("addprinc -randkey " + principal) def kadmin_modprinc(principal, options): kadmin("modprinc " + options + " " + principal) def create_keytab(path, principal): try: if ipautil.file_exists(path): os.remove(path) except os.error: logging.critical("Failed to remove %s." % path) kadmin("ktadd -k " + path + " " + principal)