4 # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008
5 # Copyright (c) 2009 Stephen Gran <steve@lobefin.net>
6 # Copyright (c) 2008,2009,2010 Peter Palfrader <peter@palfrader.org>
7 # Copyright (c) 2008 Joerg Jaspert <joerg@debian.org>
8 # Copyright (c) 2010 Helmut Grohne <helmut@subdivi.de>
25 from userdir_gpg import *
26 from userdir_ldap import *
27 from userdir_exceptions import *
29 # Error codes from /usr/include/sysexits.h
30 ReplyTo = ConfModule.replyto
31 PingFrom = ConfModule.pingfrom
32 ChPassFrom = ConfModule.chpassfrom
33 ChangeFrom = ConfModule.changefrom
34 ReplayCacheFile = ConfModule.replaycachefile
35 SSHFingerprintFile = ConfModule.fingerprintfile
37 UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'
38 machine_regex = re.compile("^[0-9a-zA-Z.-]+$")
41 EX_PERMFAIL = 65 # EX_DATAERR
42 Error = 'Message Error'
50 ValidHostNames = [] # will be initialized in later
52 SSHFingerprint = re.compile(r'^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$')
53 SSHRSA1Match = re.compile(r'^^(.* )?\d+ \d+ \d+')
55 ArbChanges = {"c": "..",
57 "facsimileTelephoneNumber": ".*",
58 "telephoneNumber": ".*",
59 "postalAddress": ".*",
63 "emailForward": "^([^<>@]+@.+)?$",
64 "jabberJID": "^([^<>@]+@.+)?$",
69 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
70 "mailDisableMessage": ".*",
71 "mailGreylisting": "^(TRUE|FALSE)$",
72 "mailCallout": "^(TRUE|FALSE)$",
73 "mailDefaultOptions": "^(TRUE|FALSE)$",
75 "mailContentInspectionAction": "^(reject|blackhole|markup)$", }
77 DelItems = {"c": None,
79 "facsimileTelephoneNumber": None,
80 "telephoneNumber": None,
81 "postalAddress": None,
94 "sshRSAAuthKey": None,
96 "mailGreylisting": None,
100 "mailWhitelist": None,
101 "mailDisableMessage": None,
102 "mailDefaultOptions": None,
104 "mailContentInspectionAction": None,
108 # Decode a GPS location from some common forms
109 def LocDecode(Str, Dir):
110 # Check for Decimal degrees, DGM, or DGMS
111 if re.match(r"^[+-]?[\d.]+$", Str) is not None:
119 # Check for DDDxMM.MMMM where x = [nsew]
120 Match = re.match(r"^(\d+)([" + Dir + r"])([\d.]+)$", Str)
128 Match = re.match(r"^([\d.]+) ?([" + Dir + r"])$", Str)
134 # Check for DD:MM.MM x
135 Match = re.match(r"^(\d+):([\d.]+) ?([" + Dir + "])$", Str)
142 # Check for DD:MM:SS.SS x
143 Match = re.match(r"^(\d+):(\d+):([\d.]+) ?([" + Dir + "])$", Str)
153 raise UDFormatError("Bad degrees")
154 if Min is not None and float(Min) > 60:
155 raise UDFormatError("Bad minutes")
156 if Sec is not None and float(Sec) > 60:
157 raise UDFormatError("Bad seconds")
159 # Pad on an extra leading 0 to disambiguate small numbers
160 if len(Deg) <= 1 or Deg[1] == '.':
162 if Min is not None and (len(Min) <= 1 or Min[1] == '.'):
164 if Sec is not None and (len(Sec) <= 1 or Sec[1] == '.'):
167 # Construct a DGM/DGMS type value from the components.
179 # Handle changing a set of arbitary fields
181 def DoArbChange(Str, Attrs):
182 Match = re.match("^([^ :]+): (.*)$", Str)
187 attrName = G[0].lower()
188 for i in ArbChanges.keys():
189 if i.lower() == attrName:
192 if attrName in ArbChanges:
195 if re.match(ArbChanges[attrName], G[1]) is None:
196 raise UDFormatError("Item does not match the required format" + ArbChanges[attrName])
198 Attrs.append((ldap.MOD_REPLACE, attrName, value))
199 return "Changed entry %s to %s" % (attrName, value)
202 # Handle changing a set of arbitary fields
204 def DoDel(Str, Attrs):
205 Match = re.match("^del (.*)$", Str)
210 attrName = G[0].lower()
211 for i in DelItems.keys():
212 if i.lower() == attrName:
215 if attrName not in DelItems:
216 return "Cannot erase entry %s" % (attrName,)
218 Attrs.append((ldap.MOD_DELETE, attrName, None))
219 return "Removed entry %s" % (attrName)
222 # Handle a position change message, the line format is:
223 # Lat: -12412.23 Long: +12341.2342
224 def DoPosition(Str, Attrs):
225 Match = re.match(r"^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
231 sLat = LocDecode(G[0], "ns")
232 sLong = LocDecode(G[1], "ew")
233 Lat = DecDegree(sLat, 1)
234 Long = DecDegree(sLong, 1)
236 raise UDFormatError("Positions were found, but they are not correctly formed")
238 Attrs.append((ldap.MOD_REPLACE, "latitude", sLat))
239 Attrs.append((ldap.MOD_REPLACE, "longitude", sLong))
240 return "Position set to %s/%s (%s/%s decimal degrees)" % (sLat, sLong, Lat, Long)
243 # Load bad ssh fingerprints
245 f = open(SSHFingerprintFile, "r")
247 FingerprintLine = re.compile(r'^([0-9a-f:]{47}).*$')
248 for line in f.readlines():
249 Match = FingerprintLine.match(line)
250 if Match is not None:
256 # Handle an SSH authentication key, the line format is:
257 # [options] 1024 35 13188913666680[..] [comment]
258 # maybe it really should be:
259 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
260 def DoSSH(Str, Attrs, badkeys, uid):
261 Match = SSH2AuthSplit.match(Str)
267 Match = SSHRSA1Match.match(Str)
268 if Match is not None:
269 return "RSA1 keys not supported anymore"
272 # lines can now be prepended with "allowed_hosts=machine1,machine2 "
274 if Str.startswith("allowed_hosts="):
275 Str = Str.split("=", 1)[1]
277 return "invalid ssh key syntax with machine specification"
278 machines, Str = Str.split(' ', 1)
279 machines = machines.split(",")
282 return "empty machine specification for ssh key"
283 if not machine_regex.match(m):
284 return "machine specification for ssh key contains invalid characters"
285 if m not in ValidHostNames:
286 return "unknown machine {} used in allowed_hosts stanza for ssh keys".format(m)
288 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
290 f.write("%s\n" % (Str))
292 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
293 (result, output) = commands.getstatusoutput(cmd)
296 raise UDExecuteError("ssh-keygen -l invocation failed!\n%s\n" % (output))
298 # format the string again for ldap:
300 Str = "allowed_hosts=%s %s" % (",".join(machines), Str)
303 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
304 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], os.environ['SENDER'], ReplyTo, Date)
306 Subst["__ADMIN__"] = ReplyTo
307 Subst["__USER__"] = uid
309 Match = SSHFingerprint.match(output)
311 return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?"
317 key_size_ok = (int(key_size) >= 2048)
318 elif typekey == "ed25519":
324 return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys."
325 elif fingerprint in badkeys:
328 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
329 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "admin-info", "r").read())
331 Child = os.popen("/usr/sbin/sendmail -t", "w")
332 Child.write(ErrReplyHead)
333 Child.write(ErrReply)
334 if Child.close() is not None:
335 raise UDExecuteError("Sendmail gave a non-zero return code")
337 sys.exit(EX_TEMPFAIL)
339 # And now break and stop processing input, which sends a reply to the user.
340 raise UDFormatError("Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL")
344 Attrs.append((ldap.MOD_ADD, "sshRSAAuthKey", Str))
345 return "SSH Key added: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
347 Attrs.append((ldap.MOD_REPLACE, "sshRSAAuthKey", Str))
349 return "SSH Keys replaced with: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
352 # Handle changing a dns entry
353 # host IN A 12.12.12.12
354 # host IN AAAA 1234::5678
355 # host IN CNAME foo.bar. <- Trailing dot is required
356 # host IN MX foo.bar. <- Trailing dot is required
357 def DoDNS(Str, Attrs, DnRecord):
358 cnamerecord = re.match(r"^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$", Str, re.IGNORECASE)
359 arecord = re.match(r'^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$', Str, re.IGNORECASE)
360 mxrecord = re.match(r"^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$", Str, re.IGNORECASE)
361 txtrecord = re.match(r"^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
362 aaaarecord = re.match(r'^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$', Str, re.IGNORECASE)
364 if cnamerecord is None and\
366 mxrecord is None and\
367 txtrecord is None and\
371 # Check if the name is already taken
372 G = re.match(r'^([-\w+]+)\s', Str)
374 raise UDFormatError("Hostname not found although we already passed record syntax checks")
375 hostname = G.group(1)
377 # Check for collisions
379 # [JT 20070409 - search for both tab and space suffixed hostnames
380 # since we accept either. It'd probably be better to parse the
381 # incoming string in order to construct what we feed LDAP rather
382 # than just passing it through as is.]
383 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
384 Rec = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, filter, ["uid"])
386 if GetAttr(x, "uid") != GetAttr(DnRecord, "uid"):
387 return "DNS entry is already owned by " + GetAttr(x, "uid")
394 return "CNAME and other RR types not allowed: " + Str
398 if DNS.get(hostname) == 2:
399 return "CNAME and other RR types not allowed: " + Str
403 if cnamerecord is not None:
404 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
405 elif txtrecord is not None:
406 sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1))
407 elif arecord is not None:
408 ipaddress = arecord.group(1)
409 for quad in ipaddress.split('.'):
410 if not (int(quad) >= 0 and int(quad) <= 255):
411 return "Invalid quad %s in IP address %s in line %s" % (quad, ipaddress, Str)
412 sanitized = "%s IN A %s" % (hostname, ipaddress)
413 elif mxrecord is not None:
414 priority = mxrecord.group(1)
415 mx = mxrecord.group(2)
416 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
417 elif aaaarecord is not None:
418 ipv6address = aaaarecord.group(1)
419 parts = ipv6address.split(':')
421 return "Invalid IPv6 address (%s): too many parts" % (ipv6address)
423 return "Invalid IPv6 address (%s): too few parts" % (ipv6address)
428 seenEmptypart = False
431 return "Invalid IPv6 address (%s): part %s is longer than 4 characters" % (ipv6address, p)
434 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed" % (ipv6address)
436 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
438 raise UDFormatError("None of the types I recognize was it. I shouldn't be here. confused.")
441 Attrs.append((ldap.MOD_ADD, "dnsZoneEntry", sanitized))
442 return "DNS Entry added " + sanitized
444 Attrs.append((ldap.MOD_REPLACE, "dnsZoneEntry", sanitized))
446 return "DNS Entry replaced with " + sanitized
449 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
450 def DoRBL(Str, Attrs):
451 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
455 if Match.group(1) == "rbl":
457 if Match.group(1) == "rhsbl":
459 if Match.group(1) == "whitelist":
460 Key = "mailWhitelist"
461 Host = Match.group(2)
465 Attrs.append((ldap.MOD_ADD, Key, Host))
466 return "%s added %s" % (Key, Host)
468 Attrs.append((ldap.MOD_REPLACE, Key, Host))
470 return "%s replaced with %s" % (Key, Host)
473 # Handle a ConfirmSudoPassword request
474 def DoConfirmSudopassword(Str, SudoPasswd):
475 Match = re.compile('^confirm sudopassword (' + UUID_FORMAT + ') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str)
479 uuid = Match.group(1)
480 hosts = Match.group(2)
481 hmac = Match.group(3)
483 SudoPasswd[uuid] = (hosts, hmac)
484 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid, hosts, hmac)
487 def FinishConfirmSudopassword(l, uid, Attrs, SudoPasswd):
490 if len(SudoPasswd) == 0:
493 res = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + uid, ['sudoPassword'])
495 raise UDFormatError("Not exactly one hit when searching for user")
496 if sudoPassword in res[0][1]:
497 inldap = res[0][1]['sudoPassword']
503 Match = re.compile('^(' + UUID_FORMAT + ') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry)
505 raise UDFormatError("Could not parse existing sudopasswd entry")
506 uuid = Match.group(1)
507 status = Match.group(2)
508 hosts = Match.group(3)
509 cryptedpass = Match.group(4)
511 if uuid in SudoPasswd:
512 confirmedHosts = SudoPasswd[uuid][0]
513 confirmedHmac = SudoPasswd[uuid][1]
514 if status.startswith('confirmed:'):
515 if status == 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
516 result += "Entry %s for sudo password on hosts %s already confirmed.\n" % (uuid, hosts)
518 result += "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n" % (uuid, hosts)
519 elif confirmedHosts != hosts:
520 result += "Entry %s hostlist mismatch (%s vs. %s).\n" % (uuid, hosts, confirmedHosts)
521 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
522 result += "Entry %s for sudo password on hosts %s now confirmed.\n" % (uuid, hosts)
523 status = 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
525 result += "Entry %s for sudo password on hosts %s HMAC verify failed.\n" % (uuid, hosts)
528 newentry = " ".join([uuid, status, hosts, cryptedpass])
529 if len(newldap) == 0:
530 newldap.append((ldap.MOD_REPLACE, "sudoPassword", newentry))
532 newldap.append((ldap.MOD_ADD, "sudoPassword", newentry))
534 for entry in SudoPasswd:
535 result += "Entry %s that you confirm is not listed in ldap." % (entry,)
537 for entry in newldap:
543 def connect_to_ldap_and_check_if_locked(DnRecord):
544 # Connect to the ldap server
546 F = open(PassDir + "/pass-" + pwd.getpwuid(os.getuid())[0], "r")
547 AccessPass = F.readline().strip().split(" ")
549 lc.simple_bind_s("uid={},{}".format(AccessPass[0], BaseDn), AccessPass[1])
551 # Check for a locked account
552 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
553 if (GetAttr(Attrs[0], "userPassword").find("*LK*") != -1) \
554 or GetAttr(Attrs[0], "userPassword").startswith("!"):
555 raise UDNotAllowedError("This account is locked")
559 # Handle an [almost] arbitary change
560 def HandleChange(Reply, DnRecord, Key):
562 Lines = re.split("\n *\r?", PlainText)
574 # Try to process a command line
575 Result += "> " + Line + "\n"
581 badkeys = LoadBadSSH()
582 Res = DoPosition(Line, Attrs) or DoDNS(Line, Attrs, DnRecord) or \
583 DoArbChange(Line, Attrs) or DoSSH(Line, Attrs, badkeys, GetAttr(DnRecord, "uid")) or \
584 DoDel(Line, Attrs) or DoRBL(Line, Attrs) or DoConfirmSudopassword(Line, SudoPasswd)
587 Result += "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
589 # Fail, if someone tries to send someone elses signed email to the
590 # daemon then we want to abort ASAP.
593 Result = Result + "Command is not understood. Halted - no changes committed\n"
597 # Connect to the ldap server
598 lc = connect_to_ldap_and_check_if_locked(DnRecord)
600 if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go
602 Res = FinishConfirmSudopassword(l, GetAttr(DnRecord, "uid"), Attrs, SudoPasswd)
607 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n" % (e)
609 if CommitChanges == 1 and len(Attrs) > 0:
610 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
611 lc.modify_s(Dn, Attrs)
615 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
617 raise UDNotAllowedError("User not found")
618 Attribs = GPGEncrypt(PrettyShow(Attrs[0]) + "\n", "0x" + Key[1], Key[4])
621 Subst["__FROM__"] = ChangeFrom
622 Subst["__EMAIL__"] = EmailAddress(DnRecord)
623 Subst["__ADMIN__"] = ReplyTo
624 Subst["__RESULT__"] = Result
625 Subst["__ATTR__"] = Attribs
627 return Reply + TemplateSubst(Subst, open(TemplatesDir + "change-reply", "r").read())
630 # Handle ping handles an email sent to the 'ping' address (ie this program
631 # called with a ping argument) It replies with a dump of the public records.
632 def HandlePing(Reply, DnRecord, Key):
634 Subst["__FROM__"] = PingFrom
635 Subst["__EMAIL__"] = EmailAddress(DnRecord)
636 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord)
637 Subst["__ADMIN__"] = ReplyTo
639 return Reply + TemplateSubst(Subst, open(TemplatesDir + "ping-reply", "r").read())
642 def get_crypttype_preamble(key):
644 type = "Your message was encrypted using PGP 2.x\ncompatibility mode."
646 type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
647 "mode, without IDEA. This message cannot be decoded using PGP 2.x"
651 # Handle a change password email sent to the change password address
652 # (this program called with the chpass argument)
653 def HandleChPass(Reply, DnRecord, Key):
654 # Generate a random password
656 Pass = HashPass(Password)
658 # Use GPG to encrypt it
659 Message = GPGEncrypt("Your new password is '" + Password + "'\n", "0x" + Key[1], Key[4])
663 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
666 Subst["__FROM__"] = ChPassFrom
667 Subst["__EMAIL__"] = EmailAddress(DnRecord)
668 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
669 Subst["__PASSWORD__"] = Message
670 Subst["__ADMIN__"] = ReplyTo
671 Reply = Reply + TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
673 lc = connect_to_ldap_and_check_if_locked(DnRecord)
674 # Modify the password
675 Rec = [(ldap.MOD_REPLACE, "userPassword", "{crypt}" + Pass),
676 (ldap.MOD_REPLACE, "shadowLastChange", str(int(time.time() / (24 * 60 * 60))))]
677 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
683 def HandleChTOTPSeed(Reply, DnRecord, Key):
684 # Generate a random seed
685 seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
686 msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "0x" + Key[1], Key[4])
689 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
692 Subst["__FROM__"] = ChPassFrom
693 Subst["__EMAIL__"] = EmailAddress(DnRecord)
694 Subst["__PASSWORD__"] = msg
695 Subst["__ADMIN__"] = ReplyTo
696 Reply += TemplateSubst(Subst, open(TemplatesDir + "totp-seed-changed", "r").read())
698 lc = connect_to_ldap_and_check_if_locked(DnRecord)
699 # Modify the password
700 Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
701 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
706 def HandleChKrbPass(Reply, DnRecord, Key):
707 # Connect to the ldap server, will throw an exception if account locked.
708 lc = connect_to_ldap_and_check_if_locked(DnRecord)
710 user = GetAttr(DnRecord, "uid")
711 krb_proc = subprocess.Popen(('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
712 krb_proc.stdin.close()
713 out = krb_proc.stdout.readlines()
715 exitcode = krb_proc.returncode
717 # Use GPG to encrypt it
718 m = "Tried to reset your kerberos principal's password.\n"
720 m += "The exitcode of the reset script was zero, indicating that everything\n"
721 m += "worked. However, this being software who knows. Script's output below."
723 m += "The exitcode of the reset script was %d, indicating that something\n" % (exitcode,)
724 m += "went terribly, terribly wrong. Please consult the script's output below\n"
725 m += "for more information. Contact the admins if you have any questions or\n"
726 m += "require assitance."
728 m += "\n" + ''.join(map(lambda x: "| " + x, out))
730 Message = GPGEncrypt(m, "0x" + Key[1], Key[4])
732 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
735 Subst["__FROM__"] = ChPassFrom
736 Subst["__EMAIL__"] = EmailAddress(DnRecord)
737 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
738 Subst["__PASSWORD__"] = Message
739 Subst["__ADMIN__"] = ReplyTo
740 Reply += TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
744 # Start of main program
747 # Drop messages from a mailer daemon.
748 if not os.environ.get('SENDER'):
751 ErrMsg = "Indeterminate Error"
752 ErrType = EX_TEMPFAIL
754 # Startup the replay cache
755 ErrType = EX_TEMPFAIL
756 ErrMsg = "Failed to initialize the replay cache:"
759 ErrType = EX_PERMFAIL
760 ErrMsg = "Failed to understand the email or find a signature:"
761 mail = email.parser.Parser().parse(sys.stdin)
762 Msg = GetClearSig(mail)
764 ErrMsg = "Message is not PGP signed:"
765 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
766 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
767 raise UDFormatError("No PGP signature")
769 # Check the signature
770 ErrMsg = "Unable to check the signature or the signature was invalid:"
771 pgp = GPGCheckSig2(Msg[0])
774 raise UDFormatError(pgp.why)
777 raise UDFormatError("Null signature text")
779 # Extract the plain message text in the event of mime encoding
781 ErrMsg = "Problem stripping MIME headers from the decoded message"
783 e = email.parser.Parser().parsestr(pgp.text)
784 PlainText = e.get_payload(decode=True)
788 # Connect to the ldap server
789 ErrType = EX_TEMPFAIL
790 ErrMsg = "An error occured while performing the LDAP lookup"
793 lc.simple_bind_s("", "")
795 # Search for the matching key fingerprint
796 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "keyFingerPrint={}".format(pgp.key_fpr))
798 ErrType = EX_PERMFAIL
800 raise UDFormatError("Key not found")
802 raise UDFormatError("Oddly your key fingerprint is assigned to more than one account..")
804 # Check the signature against the replay cache
805 RC = ReplayCache(ReplayCacheFile)
806 RC.process(pgp.sig_info)
808 # Determine the sender address
809 ErrMsg = "A problem occured while trying to formulate the reply"
810 Sender = mail.get('Reply-To', mail.get('From'))
812 raise UDFormatError("Unable to determine the sender's address")
815 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
816 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender, ReplyTo, Date)
818 Res = lc.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'])
819 # Res is a list of tuples.
820 # The tuples contain a dn (str) and a dictionary.
821 # The dictionaries map the key "hostname" to a list.
822 # These lists contain a single hostname (str).
823 ValidHostNames = reduce(lambda a, b: a + b, [value.get("hostname", []) for (dn, value) in Res], [])
826 if sys.argv[1] == "ping":
827 Reply = HandlePing(Reply, Attrs[0], pgp.key_info)
828 elif sys.argv[1] == "chpass":
829 if PlainText.strip().find("Please change my Debian password") >= 0:
830 Reply = HandleChPass(Reply, Attrs[0], pgp.key_info)
831 elif PlainText.strip().find("Please change my Kerberos password") >= 0:
832 Reply = HandleChKrbPass(Reply, Attrs[0], pgp.key_info)
833 elif PlainText.strip().find("Please change my TOTP seed") >= 0:
834 Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info)
836 raise UDFormatError("Please send a signed message where the first line of text is the string 'Please change my Debian password' or some other string we accept here.")
837 elif sys.argv[1] == "change":
838 Reply = HandleChange(Reply, Attrs[0], pgp.key_info)
841 raise UDFormatError("Incorrect Invokation")
843 # Send the message through sendmail
844 ErrMsg = "A problem occured while trying to send the reply"
845 Child = os.popen("/usr/sbin/sendmail -t", "w")
846 # Child = os.popen("cat","w")
848 if Child.close() is not None:
849 raise UDExecuteError("Sendmail gave a non-zero return code")
853 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
854 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], ReplyTo, Date)
858 Subst["__ERROR__"] = ErrMsg
859 Subst["__ADMIN__"] = ReplyTo
861 Trace = "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
862 List = traceback.extract_tb(sys.exc_traceback)
864 Trace = Trace + "Python Stack Trace:\n"
866 Trace = Trace + " %s %s:%u: %s\n" % (x[2], x[0], x[1], x[3])
868 Subst["__TRACE__"] = Trace
870 # Try to send the bounce
872 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "error-reply", "r").read())
874 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''", "w")
875 Child.write(ErrReplyHead)
876 Child.write(ErrReply)
877 if Child.close() is not None:
878 raise UDExecuteError("Sendmail gave a non-zero return code")
880 sys.exit(EX_TEMPFAIL)
882 if ErrType != EX_PERMFAIL:
888 # vim:set shiftwidth=3: