| 1 | from twisted.application import internet, service |
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| 2 | from twisted.internet import protocol, reactor, defer |
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| 3 | from twisted.protocols import basic |
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| 4 | import ldap, ldap.filter |
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| 5 | import os, sys, pwd, glob |
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| 6 | |
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| 7 | class WhoisProtocol(basic.LineReceiver): |
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| 8 | def lineReceived(self, hostname): |
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| 9 | (key, hostname) = hostname.split('=',2) |
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| 10 | if key != self.factory.key: |
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| 11 | self.transport.write("Unauthorized to use whois"+"\r\n") |
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| 12 | self.transport.loseConnection() |
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| 13 | else: |
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| 14 | self.factory.getWhois(hostname |
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| 15 | ).addErrback(lambda _: "Internal error in server" |
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| 16 | ).addCallback(lambda m: |
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| 17 | (self.transport.write(m+"\r\n"), |
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| 18 | self.transport.loseConnection())) |
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| 19 | class WhoisFactory(protocol.ServerFactory): |
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| 20 | protocol = WhoisProtocol |
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| 21 | def __init__(self, vhostDir, ldap_URL, ldap_base, keyFile): |
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| 22 | self.vhostDir = vhostDir |
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| 23 | self.ldap_URL = ldap_URL |
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| 24 | self.ldap = ldap.initialize(self.ldap_URL) |
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| 25 | self.ldap_base = ldap_base |
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| 26 | self.vhosts = {} |
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| 27 | if vhostDir: |
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| 28 | self.rescanVhosts() |
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| 29 | self.key = file(keyFile).read() |
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| 30 | def rescanVhosts(self): |
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| 31 | newVhosts = {} |
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| 32 | for f in glob.iglob(os.path.join(self.vhostDir, "*.conf")): |
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| 33 | locker = os.path.splitext(os.path.basename(f))[0] |
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| 34 | newVhosts.update(self.parseApacheConf(file(f))) |
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| 35 | self.vhosts = newVhosts |
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| 36 | self.vhostTime = os.stat(self.vhostDir).st_mtime |
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| 37 | def parseApacheConf(self, f): |
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| 38 | vhosts = {} |
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| 39 | hostnames = [] |
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| 40 | locker = None |
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| 41 | docroot = None |
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| 42 | for l in f: |
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| 43 | parts = l.split() |
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| 44 | if not parts: continue |
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| 45 | command = parts.pop(0) |
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| 46 | if command in ("ServerName", "ServerAlias"): |
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| 47 | hostnames.extend(parts) |
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| 48 | elif command in ("SuExecUserGroup",): |
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| 49 | locker = parts[0] |
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| 50 | elif command in ("DocumentRoot",): |
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| 51 | docroot = parts[0] |
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| 52 | elif command == "</VirtualHost>": |
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| 53 | d = {'locker': locker, 'apacheDocumentRoot': docroot, 'apacheServerName': hostnames[0]} |
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| 54 | for h in hostnames: vhosts[h] = d |
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| 55 | hostnames = [] |
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| 56 | locker = None |
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| 57 | docroot = None |
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| 58 | return vhosts |
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| 59 | def canonicalize(self, vhost): |
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| 60 | vhost = vhost.lower().rstrip(".") |
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| 61 | return vhost |
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| 62 | # if vhost.endswith(".mit.edu"): |
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| 63 | # return vhost |
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| 64 | # else: |
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| 65 | # return vhost + ".mit.edu" |
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| 66 | def searchLDAP(self, vhost): |
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| 67 | results = self.ldap.search_st(self.ldap_base, ldap.SCOPE_SUBTREE, |
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| 68 | ldap.filter.filter_format( |
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| 69 | '(|(apacheServername=%s)(apacheServerAlias=%s))', (vhost,)*2), |
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| 70 | timeout=5) |
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| 71 | if len(results) >= 1: |
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| 72 | result = results[0] |
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| 73 | attrs = result[1] |
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| 74 | for attr in ('apacheServerName','apacheDocumentRoot', 'apacheSuexecUid', 'apacheSuexecGid'): |
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| 75 | attrs[attr] = attrs[attr][0] |
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| 76 | user = pwd.getpwuid(int(attrs['apacheSuexecUid'])) |
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| 77 | if user: |
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| 78 | attrs['locker'] = user.pw_name |
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| 79 | else: |
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| 80 | attrs['locker'] = None |
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| 81 | return attrs |
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| 82 | else: |
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| 83 | return None |
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| 84 | def getWhois(self, vhost): |
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| 85 | vhost = self.canonicalize(vhost) |
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| 86 | info = self.vhosts.get(vhost) |
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| 87 | tries = 0 |
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| 88 | while (tries < 3) and not info: |
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| 89 | tries += 1 |
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| 90 | try: |
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| 91 | info = self.searchLDAP(vhost) |
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| 92 | break |
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| 93 | except (ldap.TIMEOUT, ldap.SERVER_DOWN): |
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| 94 | self.ldap.unbind() |
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| 95 | self.ldap = ldap.initialize(self.ldap_URL) |
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| 96 | if info: |
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| 97 | ret = "Hostname: %s\nAlias: %s\nLocker: %s\nDocument Root: %s" % \ |
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| 98 | (info['apacheServerName'], vhost, info['locker'], info['apacheDocumentRoot']) |
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| 99 | elif tries == 3: |
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| 100 | ret = "The whois server is experiencing problems looking up LDAP records.\nPlease contact scripts@mit.edu for help if this problem persists." |
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| 101 | else: |
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| 102 | ret = "No such hostname" |
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| 103 | return defer.succeed(ret) |
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| 104 | |
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| 105 | application = service.Application('whois', uid=99, gid=99) |
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| 106 | factory = WhoisFactory(None, |
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| 107 | "ldap://localhost", "ou=VirtualHosts,dc=scripts,dc=mit,dc=edu", "/etc/whoisd-password") |
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| 108 | internet.TCPServer(43, factory).setServiceParent( |
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| 109 | service.IServiceCollection(application)) |
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