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("^([^ :]+): (.*)$", Str)
187 attrName = G[0].lower()
188 for i in ArbChanges.keys():
189 if i.lower() == attrName:
192 if attrName not in ArbChanges:
195 if re.match(ArbChanges[attrName], G[1]) is None:
196 raise UDFormatError("Item does not match the required format" + ArbChanges[attrName])
200 Attrs.append((ldap.MOD_REPLACE, attrName, value))
201 return "Changed entry %s to %s" % (attrName, value)
204 # Handle changing a set of arbitary fields
206 def DoDel(Str, Attrs):
207 Match = re.match("^del (.*)$", Str)
212 attrName = G[0].lower()
213 for i in DelItems.keys():
214 if i.lower() == attrName:
217 if attrName not in DelItems:
218 return "Cannot erase entry %s" % (attrName,)
220 Attrs.append((ldap.MOD_DELETE, attrName, None))
221 return "Removed entry %s" % (attrName)
224 # Handle a position change message, the line format is:
225 # Lat: -12412.23 Long: +12341.2342
226 def DoPosition(Str, Attrs):
227 Match = re.match(r"^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
233 sLat = LocDecode(G[0], "ns")
234 sLong = LocDecode(G[1], "ew")
235 Lat = DecDegree(sLat, 1)
236 Long = DecDegree(sLong, 1)
238 raise UDFormatError("Positions were found, but they are not correctly formed")
240 Attrs.append((ldap.MOD_REPLACE, "latitude", sLat))
241 Attrs.append((ldap.MOD_REPLACE, "longitude", sLong))
242 return "Position set to %s/%s (%s/%s decimal degrees)" % (sLat, sLong, Lat, Long)
245 # Load bad ssh fingerprints
247 f = open(SSHFingerprintFile, "r")
249 FingerprintLine = re.compile(r'^([0-9a-f:]{47}).*$')
250 for line in f.readlines():
251 Match = FingerprintLine.match(line)
252 if Match is not None:
258 # Handle an SSH authentication key, the line format is:
259 # [options] 1024 35 13188913666680[..] [comment]
260 # maybe it really should be:
261 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
262 def DoSSH(Str, Attrs, badkeys, uid):
263 Match = SSH2AuthSplit.match(Str)
269 Match = SSHRSA1Match.match(Str)
270 if Match is not None:
271 return "RSA1 keys not supported anymore"
274 # lines can now be prepended with "allowed_hosts=machine1,machine2 "
276 if Str.startswith("allowed_hosts="):
277 Str = Str.split("=", 1)[1]
279 return "invalid ssh key syntax with machine specification"
280 machines, Str = Str.split(' ', 1)
281 machines = machines.split(",")
284 return "empty machine specification for ssh key"
285 if not machine_regex.match(m):
286 return "machine specification for ssh key contains invalid characters"
287 if m not in ValidHostNames:
288 return "unknown machine {} used in allowed_hosts stanza for ssh keys".format(m)
290 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
292 f.write("%s\n" % (Str))
294 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
295 (result, output) = commands.getstatusoutput(cmd)
298 raise UDExecuteError("ssh-keygen -l invocation failed!\n%s\n" % (output))
300 # format the string again for ldap:
302 Str = "allowed_hosts=%s %s" % (",".join(machines), Str)
305 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
306 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], os.environ['SENDER'], ReplyTo, Date)
308 Subst["__ADMIN__"] = ReplyTo
309 Subst["__USER__"] = uid
311 Match = SSHFingerprint.match(output)
313 return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?"
319 key_size_ok = (int(key_size) >= 2048)
320 elif typekey == "ed25519":
326 return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys."
327 elif fingerprint in badkeys:
330 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
331 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "admin-info", "r").read())
333 Child = os.popen("/usr/sbin/sendmail -t", "w")
334 Child.write(ErrReplyHead)
335 Child.write(ErrReply)
336 if Child.close() is not None:
337 raise UDExecuteError("Sendmail gave a non-zero return code")
339 sys.exit(EX_TEMPFAIL)
341 # And now break and stop processing input, which sends a reply to the user.
342 raise UDFormatError("Submitted SSH key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL")
346 Attrs.append((ldap.MOD_ADD, "sshRSAAuthKey", Str))
347 return "SSH Key added: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
349 Attrs.append((ldap.MOD_REPLACE, "sshRSAAuthKey", Str))
351 return "SSH Keys replaced with: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
354 # Handle changing a dns entry
355 # host IN A 12.12.12.12
356 # host IN AAAA 1234::5678
357 # host IN CNAME foo.bar. <- Trailing dot is required
358 # host IN MX foo.bar. <- Trailing dot is required
359 def DoDNS(Str, Attrs, DnRecord):
360 cnamerecord = re.match(r"^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$", Str, re.IGNORECASE)
361 arecord = re.match(r'^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$', Str, re.IGNORECASE)
362 mxrecord = re.match(r"^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$", Str, re.IGNORECASE)
363 txtrecord = re.match(r"^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
364 aaaarecord = re.match(r'^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$', Str, re.IGNORECASE)
366 if cnamerecord is None and\
368 mxrecord is None and\
369 txtrecord is None and\
373 # Check if the name is already taken
374 G = re.match(r'^([-\w+]+)\s', Str)
376 raise UDFormatError("Hostname not found although we already passed record syntax checks")
377 hostname = G.group(1)
379 # Check for collisions
381 # [JT 20070409 - search for both tab and space suffixed hostnames
382 # since we accept either. It'd probably be better to parse the
383 # incoming string in order to construct what we feed LDAP rather
384 # than just passing it through as is.]
385 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
386 Rec = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, filter, ["uid"])
388 if GetAttr(x, "uid") != GetAttr(DnRecord, "uid"):
389 return "DNS entry is already owned by " + GetAttr(x, "uid")
396 return "CNAME and other RR types not allowed: " + Str
400 if DNS.get(hostname) == 2:
401 return "CNAME and other RR types not allowed: " + Str
405 if cnamerecord is not None:
406 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
407 elif txtrecord is not None:
408 sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1))
409 elif arecord is not None:
410 ipaddress = arecord.group(1)
411 for quad in ipaddress.split('.'):
412 if not (int(quad) >= 0 and int(quad) <= 255):
413 return "Invalid quad %s in IP address %s in line %s" % (quad, ipaddress, Str)
414 sanitized = "%s IN A %s" % (hostname, ipaddress)
415 elif mxrecord is not None:
416 priority = mxrecord.group(1)
417 mx = mxrecord.group(2)
418 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
419 elif aaaarecord is not None:
420 ipv6address = aaaarecord.group(1)
421 parts = ipv6address.split(':')
423 return "Invalid IPv6 address (%s): too many parts" % (ipv6address)
425 return "Invalid IPv6 address (%s): too few parts" % (ipv6address)
430 seenEmptypart = False
433 return "Invalid IPv6 address (%s): part %s is longer than 4 characters" % (ipv6address, p)
436 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed" % (ipv6address)
438 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
440 raise UDFormatError("None of the types I recognize was it. I shouldn't be here. confused.")
443 Attrs.append((ldap.MOD_ADD, "dnsZoneEntry", sanitized))
444 return "DNS Entry added " + sanitized
446 Attrs.append((ldap.MOD_REPLACE, "dnsZoneEntry", sanitized))
448 return "DNS Entry replaced with " + sanitized
451 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
452 def DoRBL(Str, Attrs):
453 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
457 if Match.group(1) == "rbl":
459 if Match.group(1) == "rhsbl":
461 if Match.group(1) == "whitelist":
462 Key = "mailWhitelist"
463 Host = Match.group(2)
467 Attrs.append((ldap.MOD_ADD, Key, Host))
468 return "%s added %s" % (Key, Host)
470 Attrs.append((ldap.MOD_REPLACE, Key, Host))
472 return "%s replaced with %s" % (Key, Host)
475 # Handle a ConfirmSudoPassword request
476 def DoConfirmSudopassword(Str, SudoPasswd):
477 Match = re.compile('^confirm sudopassword (' + UUID_FORMAT + ') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str)
481 uuid = Match.group(1)
482 hosts = Match.group(2)
483 hmac = Match.group(3)
485 SudoPasswd[uuid] = (hosts, hmac)
486 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid, hosts, hmac)
489 def FinishConfirmSudopassword(lc, uid, Attrs, SudoPasswd):
492 if len(SudoPasswd) == 0:
495 res = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + uid, ['sudoPassword'])
497 raise UDFormatError("Not exactly one hit when searching for user")
498 if 'sudoPassword' in res[0][1]:
499 inldap = res[0][1]['sudoPassword']
505 Match = re.compile('^(' + UUID_FORMAT + ') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry)
507 raise UDFormatError("Could not parse existing sudopasswd entry")
508 uuid = Match.group(1)
509 status = Match.group(2)
510 hosts = Match.group(3)
511 cryptedpass = Match.group(4)
513 if uuid in SudoPasswd:
514 confirmedHosts = SudoPasswd[uuid][0]
515 confirmedHmac = SudoPasswd[uuid][1]
516 if status.startswith('confirmed:'):
517 if status == 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
518 result += "Entry %s for sudo password on hosts %s already confirmed.\n" % (uuid, hosts)
520 result += "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n" % (uuid, hosts)
521 elif confirmedHosts != hosts:
522 result += "Entry %s hostlist mismatch (%s vs. %s).\n" % (uuid, hosts, confirmedHosts)
523 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
524 result += "Entry %s for sudo password on hosts %s now confirmed.\n" % (uuid, hosts)
525 status = 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
527 result += "Entry %s for sudo password on hosts %s HMAC verify failed.\n" % (uuid, hosts)
530 newentry = " ".join([uuid, status, hosts, cryptedpass])
531 if len(newldap) == 0:
532 newldap.append((ldap.MOD_REPLACE, "sudoPassword", newentry))
534 newldap.append((ldap.MOD_ADD, "sudoPassword", newentry))
536 for entry in SudoPasswd:
537 result += "Entry %s that you confirm is not listed in ldap." % (entry,)
539 for entry in newldap:
545 def connect_to_ldap_and_check_if_locked(DnRecord):
546 # Connect to the ldap server
548 F = open(PassDir + "/pass-" + pwd.getpwuid(os.getuid())[0], "r")
549 AccessPass = F.readline().strip().split(" ")
551 lc.simple_bind_s("uid={},{}".format(AccessPass[0], BaseDn), AccessPass[1])
553 # Check for a locked account
554 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
555 if (GetAttr(Attrs[0], "userPassword").find("*LK*") != -1) \
556 or GetAttr(Attrs[0], "userPassword").startswith("!"):
557 raise UDNotAllowedError("This account is locked")
561 # Handle an [almost] arbitary change
562 def HandleChange(Reply, DnRecord, Key):
564 Lines = re.split("\n *\r?", PlainText)
576 # Try to process a command line
577 Result += "> " + Line + "\n"
583 badkeys = LoadBadSSH()
584 Res = DoPosition(Line, Attrs) or DoDNS(Line, Attrs, DnRecord) or \
585 DoArbChange(Line, Attrs) or DoSSH(Line, Attrs, badkeys, GetAttr(DnRecord, "uid")) or \
586 DoDel(Line, Attrs) or DoRBL(Line, Attrs) or DoConfirmSudopassword(Line, SudoPasswd)
589 Result += "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
591 # Fail, if someone tries to send someone elses signed email to the
592 # daemon then we want to abort ASAP.
595 Result = Result + "Command is not understood. Halted - no changes committed\n"
599 # Connect to the ldap server
600 lc = connect_to_ldap_and_check_if_locked(DnRecord)
602 if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go
604 Res = FinishConfirmSudopassword(lc, GetAttr(DnRecord, "uid"), Attrs, SudoPasswd)
609 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n" % (e)
611 if CommitChanges == 1 and len(Attrs) > 0:
612 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
613 lc.modify_s(Dn, Attrs)
617 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
619 raise UDNotAllowedError("User not found")
620 Attribs = GPGEncrypt(PrettyShow(Attrs[0]) + "\n", "0x" + Key[1], Key[4])
623 Subst["__FROM__"] = ChangeFrom
624 Subst["__EMAIL__"] = EmailAddress(DnRecord)
625 Subst["__ADMIN__"] = ReplyTo
626 Subst["__RESULT__"] = Result
627 Subst["__ATTR__"] = Attribs
629 return Reply + TemplateSubst(Subst, open(TemplatesDir + "change-reply", "r").read())
632 # Handle ping handles an email sent to the 'ping' address (ie this program
633 # called with a ping argument) It replies with a dump of the public records.
634 def HandlePing(Reply, DnRecord, Key):
636 Subst["__FROM__"] = PingFrom
637 Subst["__EMAIL__"] = EmailAddress(DnRecord)
638 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord)
639 Subst["__ADMIN__"] = ReplyTo
641 return Reply + TemplateSubst(Subst, open(TemplatesDir + "ping-reply", "r").read())
644 def get_crypttype_preamble(key):
646 type = "Your message was encrypted using PGP 2.x\ncompatibility mode."
648 type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
649 "mode, without IDEA. This message cannot be decoded using PGP 2.x"
653 # Handle a change password email sent to the change password address
654 # (this program called with the chpass argument)
655 def HandleChPass(Reply, DnRecord, Key):
656 # Generate a random password
658 Pass = HashPass(Password)
660 # Use GPG to encrypt it
661 Message = GPGEncrypt("Your new password is '" + Password + "'\n", "0x" + Key[1], Key[4])
665 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
668 Subst["__FROM__"] = ChPassFrom
669 Subst["__EMAIL__"] = EmailAddress(DnRecord)
670 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
671 Subst["__PASSWORD__"] = Message
672 Subst["__ADMIN__"] = ReplyTo
673 Reply = Reply + TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
675 lc = connect_to_ldap_and_check_if_locked(DnRecord)
676 # Modify the password
677 Rec = [(ldap.MOD_REPLACE, "userPassword", "{crypt}" + Pass),
678 (ldap.MOD_REPLACE, "shadowLastChange", str(int(time.time() / (24 * 60 * 60))))]
679 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
685 def HandleChTOTPSeed(Reply, DnRecord, Key):
686 # Generate a random seed
687 seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
688 msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "0x" + Key[1], Key[4])
691 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
694 Subst["__FROM__"] = ChPassFrom
695 Subst["__EMAIL__"] = EmailAddress(DnRecord)
696 Subst["__PASSWORD__"] = msg
697 Subst["__ADMIN__"] = ReplyTo
698 Reply += TemplateSubst(Subst, open(TemplatesDir + "totp-seed-changed", "r").read())
700 lc = connect_to_ldap_and_check_if_locked(DnRecord)
701 # Modify the password
702 Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
703 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
708 def HandleChKrbPass(Reply, DnRecord, Key):
709 # Connect to the ldap server, will throw an exception if account locked.
710 lc = connect_to_ldap_and_check_if_locked(DnRecord)
712 user = GetAttr(DnRecord, "uid")
713 krb_proc = subprocess.Popen(('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
714 krb_proc.stdin.close()
715 out = krb_proc.stdout.readlines()
717 exitcode = krb_proc.returncode
719 # Use GPG to encrypt it
720 m = "Tried to reset your kerberos principal's password.\n"
722 m += "The exitcode of the reset script was zero, indicating that everything\n"
723 m += "worked. However, this being software who knows. Script's output below."
725 m += "The exitcode of the reset script was %d, indicating that something\n" % (exitcode,)
726 m += "went terribly, terribly wrong. Please consult the script's output below\n"
727 m += "for more information. Contact the admins if you have any questions or\n"
728 m += "require assitance."
730 m += "\n" + ''.join(map(lambda x: "| " + x, out))
732 Message = GPGEncrypt(m, "0x" + Key[1], Key[4])
734 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
737 Subst["__FROM__"] = ChPassFrom
738 Subst["__EMAIL__"] = EmailAddress(DnRecord)
739 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
740 Subst["__PASSWORD__"] = Message
741 Subst["__ADMIN__"] = ReplyTo
742 Reply += TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
746 # Start of main program
749 # Drop messages from a mailer daemon.
750 if not os.environ.get('SENDER'):
753 ErrMsg = "Indeterminate Error"
754 ErrType = EX_TEMPFAIL
756 # Startup the replay cache
757 ErrType = EX_TEMPFAIL
758 ErrMsg = "Failed to initialize the replay cache:"
761 ErrType = EX_PERMFAIL
762 ErrMsg = "Failed to understand the email or find a signature:"
763 mail = email.parser.Parser().parse(sys.stdin)
764 Msg = GetClearSig(mail)
766 ErrMsg = "Message is not PGP signed:"
767 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
768 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
769 raise UDFormatError("No PGP signature")
771 # Check the signature
772 ErrMsg = "Unable to check the signature or the signature was invalid:"
773 pgp = GPGCheckSig2(Msg[0])
776 raise UDFormatError(pgp.why)
779 raise UDFormatError("Null signature text")
781 # Extract the plain message text in the event of mime encoding
783 ErrMsg = "Problem stripping MIME headers from the decoded message"
785 e = email.parser.Parser().parsestr(pgp.text)
786 PlainText = e.get_payload(decode=True)
790 # Connect to the ldap server
791 ErrType = EX_TEMPFAIL
792 ErrMsg = "An error occured while performing the LDAP lookup"
795 lc.simple_bind_s("", "")
797 # Search for the matching key fingerprint
798 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "keyFingerPrint={}".format(pgp.key_fpr))
800 ErrType = EX_PERMFAIL
802 raise UDFormatError("Key not found")
804 raise UDFormatError("Oddly your key fingerprint is assigned to more than one account..")
806 # Check the signature against the replay cache
807 RC = ReplayCache(ReplayCacheFile)
808 RC.process(pgp.sig_info)
810 # Determine the sender address
811 ErrMsg = "A problem occured while trying to formulate the reply"
812 Sender = mail.get('Reply-To', mail.get('From'))
814 raise UDFormatError("Unable to determine the sender's address")
817 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
818 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender, ReplyTo, Date)
820 Res = lc.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'])
821 # Res is a list of tuples.
822 # The tuples contain a dn (str) and a dictionary.
823 # The dictionaries map the key "hostname" to a list.
824 # These lists contain a single hostname (str).
825 ValidHostNames = reduce(lambda a, b: a + b, [value.get("hostname", []) for (dn, value) in Res], [])
828 if sys.argv[1] == "ping":
829 Reply = HandlePing(Reply, Attrs[0], pgp.key_info)
830 elif sys.argv[1] == "chpass":
831 if PlainText.strip().find("Please change my Debian password") >= 0:
832 Reply = HandleChPass(Reply, Attrs[0], pgp.key_info)
833 elif PlainText.strip().find("Please change my Kerberos password") >= 0:
834 Reply = HandleChKrbPass(Reply, Attrs[0], pgp.key_info)
835 elif PlainText.strip().find("Please change my TOTP seed") >= 0:
836 Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info)
838 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.")
839 elif sys.argv[1] == "change":
840 Reply = HandleChange(Reply, Attrs[0], pgp.key_info)
843 raise UDFormatError("Incorrect Invokation")
845 # Send the message through sendmail
846 ErrMsg = "A problem occured while trying to send the reply"
847 Child = os.popen("/usr/sbin/sendmail -t", "w")
848 # Child = os.popen("cat","w")
850 if Child.close() is not None:
851 raise UDExecuteError("Sendmail gave a non-zero return code")
855 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
856 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], ReplyTo, Date)
860 Subst["__ERROR__"] = ErrMsg
861 Subst["__ADMIN__"] = ReplyTo
863 Trace = "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
864 List = traceback.extract_tb(sys.exc_traceback)
866 Trace = Trace + "Python Stack Trace:\n"
868 Trace = Trace + " %s %s:%u: %s\n" % (x[2], x[0], x[1], x[3])
870 Subst["__TRACE__"] = Trace
872 # Try to send the bounce
874 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "error-reply", "r").read())
876 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''", "w")
877 Child.write(ErrReplyHead)
878 Child.write(ErrReply)
879 if Child.close() is not None:
880 raise UDExecuteError("Sendmail gave a non-zero return code")
882 sys.exit(EX_TEMPFAIL)
884 if ErrType != EX_PERMFAIL:
890 # vim:set shiftwidth=4: