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("^([^ :]+): (.*)$", Str)
187 attrName = G[0].lower()
188 for i in ArbChanges.keys():
189 if i.lower() == attrName:
192 if attrName not in ArbChanges:
196 if re.match(ArbChanges[attrName], value) is None:
197 raise UDFormatError("Item does not match the required format" + ArbChanges[attrName])
199 Attrs.append((ldap.MOD_REPLACE, attrName, value))
200 return "Changed entry %s to %s" % (attrName, value)
203 # Handle changing a set of arbitary fields
205 def DoDel(Str, Attrs):
206 Match = re.match("^del (.*)$", Str)
211 attrName = G[0].lower()
212 for i in DelItems.keys():
213 if i.lower() == attrName:
216 if attrName not in DelItems:
217 return "Cannot erase entry %s" % (attrName,)
219 Attrs.append((ldap.MOD_DELETE, attrName, None))
220 return "Removed entry %s" % (attrName)
223 # Handle a position change message, the line format is:
224 # Lat: -12412.23 Long: +12341.2342
225 def DoPosition(Str, Attrs):
226 Match = re.match(r"^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
232 sLat = LocDecode(G[0], "ns")
233 sLong = LocDecode(G[1], "ew")
234 Lat = DecDegree(sLat, 1)
235 Long = DecDegree(sLong, 1)
237 raise UDFormatError("Positions were found, but they are not correctly formed")
239 Attrs.append((ldap.MOD_REPLACE, "latitude", sLat))
240 Attrs.append((ldap.MOD_REPLACE, "longitude", sLong))
241 return "Position set to %s/%s (%s/%s decimal degrees)" % (sLat, sLong, Lat, Long)
244 # Load bad ssh fingerprints
246 f = open(SSHFingerprintFile, "r")
248 FingerprintLine = re.compile(r'^([0-9a-f:]{47}).*$')
249 for line in f.readlines():
250 Match = FingerprintLine.match(line)
251 if Match is not None:
257 # Handle an SSH authentication key, the line format is:
258 # [options] 1024 35 13188913666680[..] [comment]
259 # maybe it really should be:
260 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
261 def DoSSH(Str, Attrs, badkeys, uid):
262 Match = SSH2AuthSplit.match(Str)
268 Match = SSHRSA1Match.match(Str)
269 if Match is not None:
270 return "RSA1 keys not supported anymore"
273 # lines can now be prepended with "allowed_hosts=machine1,machine2 "
275 if Str.startswith("allowed_hosts="):
276 Str = Str.split("=", 1)[1]
278 return "invalid ssh key syntax with machine specification"
279 machines, Str = Str.split(' ', 1)
280 machines = machines.split(",")
283 return "empty machine specification for ssh key"
284 if not machine_regex.match(m):
285 return "machine specification for ssh key contains invalid characters"
286 if m not in ValidHostNames:
287 return "unknown machine {} used in allowed_hosts stanza for ssh keys".format(m)
289 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
291 f.write("%s\n" % (Str))
293 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
294 (result, output) = commands.getstatusoutput(cmd)
297 raise UDExecuteError("ssh-keygen -l invocation failed!\n%s\n" % (output))
299 # format the string again for ldap:
301 Str = "allowed_hosts=%s %s" % (",".join(machines), Str)
304 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
305 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], os.environ['SENDER'], ReplyTo, Date)
307 Subst["__ADMIN__"] = ReplyTo
308 Subst["__USER__"] = uid
310 Match = SSHFingerprint.match(output)
312 return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?"
318 key_size_ok = (int(key_size) >= 2048)
319 elif typekey == "ed25519":
325 return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys."
326 elif fingerprint in badkeys:
329 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
330 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "admin-info", "r").read())
332 Child = os.popen("/usr/sbin/sendmail -t", "w")
333 Child.write(ErrReplyHead)
334 Child.write(ErrReply)
335 if Child.close() is not None:
336 raise UDExecuteError("Sendmail gave a non-zero return code")
338 sys.exit(EX_TEMPFAIL)
340 # And now break and stop processing input, which sends a reply to the user.
341 raise UDFormatError("Submitted SSH key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL")
345 Attrs.append((ldap.MOD_ADD, "sshRSAAuthKey", Str))
346 return "SSH Key added: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
348 Attrs.append((ldap.MOD_REPLACE, "sshRSAAuthKey", Str))
350 return "SSH Keys replaced with: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
353 # Handle changing a dns entry
354 # host IN A 12.12.12.12
355 # host IN AAAA 1234::5678
356 # host IN CNAME foo.bar. <- Trailing dot is required
357 # host IN MX foo.bar. <- Trailing dot is required
358 def DoDNS(Str, Attrs, DnRecord):
359 cnamerecord = re.match(r"^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$", Str, re.IGNORECASE)
360 arecord = re.match(r'^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$', Str, re.IGNORECASE)
361 mxrecord = re.match(r"^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$", Str, re.IGNORECASE)
362 txtrecord = re.match(r"^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
363 aaaarecord = re.match(r'^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$', Str, re.IGNORECASE)
365 if cnamerecord is None and\
367 mxrecord is None and\
368 txtrecord is None and\
372 # Check if the name is already taken
373 G = re.match(r'^([-\w+]+)\s', Str)
375 raise UDFormatError("Hostname not found although we already passed record syntax checks")
376 hostname = G.group(1)
378 # Check for collisions
380 # [JT 20070409 - search for both tab and space suffixed hostnames
381 # since we accept either. It'd probably be better to parse the
382 # incoming string in order to construct what we feed LDAP rather
383 # than just passing it through as is.]
384 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
385 Rec = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, filter, ["uid"])
387 if GetAttr(x, "uid") != GetAttr(DnRecord, "uid"):
388 return "DNS entry is already owned by " + GetAttr(x, "uid")
395 return "CNAME and other RR types not allowed: " + Str
399 if DNS.get(hostname) == 2:
400 return "CNAME and other RR types not allowed: " + Str
404 if cnamerecord is not None:
405 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
406 elif txtrecord is not None:
407 sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1))
408 elif arecord is not None:
409 ipaddress = arecord.group(1)
410 for quad in ipaddress.split('.'):
411 if not (int(quad) >= 0 and int(quad) <= 255):
412 return "Invalid quad %s in IP address %s in line %s" % (quad, ipaddress, Str)
413 sanitized = "%s IN A %s" % (hostname, ipaddress)
414 elif mxrecord is not None:
415 priority = mxrecord.group(1)
416 mx = mxrecord.group(2)
417 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
418 elif aaaarecord is not None:
419 ipv6address = aaaarecord.group(1)
420 parts = ipv6address.split(':')
422 return "Invalid IPv6 address (%s): too many parts" % (ipv6address)
424 return "Invalid IPv6 address (%s): too few parts" % (ipv6address)
429 seenEmptypart = False
432 return "Invalid IPv6 address (%s): part %s is longer than 4 characters" % (ipv6address, p)
435 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed" % (ipv6address)
437 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
439 raise UDFormatError("None of the types I recognize was it. I shouldn't be here. confused.")
442 Attrs.append((ldap.MOD_ADD, "dnsZoneEntry", sanitized))
443 return "DNS Entry added " + sanitized
445 Attrs.append((ldap.MOD_REPLACE, "dnsZoneEntry", sanitized))
447 return "DNS Entry replaced with " + sanitized
450 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
451 def DoRBL(Str, Attrs):
452 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
456 if Match.group(1) == "rbl":
458 if Match.group(1) == "rhsbl":
460 if Match.group(1) == "whitelist":
461 Key = "mailWhitelist"
462 Host = Match.group(2)
466 Attrs.append((ldap.MOD_ADD, Key, Host))
467 return "%s added %s" % (Key, Host)
469 Attrs.append((ldap.MOD_REPLACE, Key, Host))
471 return "%s replaced with %s" % (Key, Host)
474 # Handle a ConfirmSudoPassword request
475 def DoConfirmSudopassword(Str, SudoPasswd):
476 Match = re.compile('^confirm sudopassword (' + UUID_FORMAT + ') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str)
480 uuid = Match.group(1)
481 hosts = Match.group(2)
482 hmac = Match.group(3)
484 SudoPasswd[uuid] = (hosts, hmac)
485 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid, hosts, hmac)
488 def FinishConfirmSudopassword(lc, uid, Attrs, SudoPasswd):
491 if len(SudoPasswd) == 0:
494 res = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + uid, ['sudoPassword'])
496 raise UDFormatError("Not exactly one hit when searching for user")
497 if 'sudoPassword' in res[0][1]:
498 inldap = res[0][1]['sudoPassword']
504 Match = re.compile('^(' + UUID_FORMAT + ') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry)
506 raise UDFormatError("Could not parse existing sudopasswd entry")
507 uuid = Match.group(1)
508 status = Match.group(2)
509 hosts = Match.group(3)
510 cryptedpass = Match.group(4)
512 if uuid in SudoPasswd:
513 confirmedHosts = SudoPasswd[uuid][0]
514 confirmedHmac = SudoPasswd[uuid][1]
515 if status.startswith('confirmed:'):
516 if status == 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
517 result += "Entry %s for sudo password on hosts %s already confirmed.\n" % (uuid, hosts)
519 result += "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n" % (uuid, hosts)
520 elif confirmedHosts != hosts:
521 result += "Entry %s hostlist mismatch (%s vs. %s).\n" % (uuid, hosts, confirmedHosts)
522 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
523 result += "Entry %s for sudo password on hosts %s now confirmed.\n" % (uuid, hosts)
524 status = 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
526 result += "Entry %s for sudo password on hosts %s HMAC verify failed.\n" % (uuid, hosts)
529 newentry = " ".join([uuid, status, hosts, cryptedpass])
530 if len(newldap) == 0:
531 newldap.append((ldap.MOD_REPLACE, "sudoPassword", newentry))
533 newldap.append((ldap.MOD_ADD, "sudoPassword", newentry))
535 for entry in SudoPasswd:
536 result += "Entry %s that you confirm is not listed in ldap." % (entry,)
538 for entry in newldap:
544 def connect_to_ldap_and_check_if_locked(DnRecord):
545 # Connect to the ldap server
547 F = open(PassDir + "/pass-" + pwd.getpwuid(os.getuid())[0], "r")
548 AccessPass = F.readline().strip().split(" ")
550 lc.simple_bind_s("uid={},{}".format(AccessPass[0], BaseDn), AccessPass[1])
552 # Check for a locked account
553 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
554 if (GetAttr(Attrs[0], "userPassword").find("*LK*") != -1) \
555 or GetAttr(Attrs[0], "userPassword").startswith("!"):
556 raise UDNotAllowedError("This account is locked")
560 # Handle an [almost] arbitary change
561 def HandleChange(Reply, DnRecord, Key):
563 Lines = re.split("\n *\r?", PlainText)
575 # Try to process a command line
576 Result += "> " + Line + "\n"
582 badkeys = LoadBadSSH()
583 Res = DoPosition(Line, Attrs) or DoDNS(Line, Attrs, DnRecord) or \
584 DoArbChange(Line, Attrs) or DoSSH(Line, Attrs, badkeys, GetAttr(DnRecord, "uid")) or \
585 DoDel(Line, Attrs) or DoRBL(Line, Attrs) or DoConfirmSudopassword(Line, SudoPasswd)
588 Result += "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
590 # Fail, if someone tries to send someone elses signed email to the
591 # daemon then we want to abort ASAP.
594 Result = Result + "Command is not understood. Halted - no changes committed\n"
598 # Connect to the ldap server
599 lc = connect_to_ldap_and_check_if_locked(DnRecord)
601 if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go
603 Res = FinishConfirmSudopassword(lc, GetAttr(DnRecord, "uid"), Attrs, SudoPasswd)
608 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n" % (e)
610 if CommitChanges == 1 and len(Attrs) > 0:
611 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
612 lc.modify_s(Dn, Attrs)
616 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
618 raise UDNotAllowedError("User not found")
619 Attribs = GPGEncrypt(PrettyShow(Attrs[0]) + "\n", "0x" + Key[1], Key[4])
622 Subst["__FROM__"] = ChangeFrom
623 Subst["__EMAIL__"] = EmailAddress(DnRecord)
624 Subst["__ADMIN__"] = ReplyTo
625 Subst["__RESULT__"] = Result
626 Subst["__ATTR__"] = Attribs
628 return Reply + TemplateSubst(Subst, open(TemplatesDir + "change-reply", "r").read())
631 # Handle ping handles an email sent to the 'ping' address (ie this program
632 # called with a ping argument) It replies with a dump of the public records.
633 def HandlePing(Reply, DnRecord, Key):
635 Subst["__FROM__"] = PingFrom
636 Subst["__EMAIL__"] = EmailAddress(DnRecord)
637 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord)
638 Subst["__ADMIN__"] = ReplyTo
640 return Reply + TemplateSubst(Subst, open(TemplatesDir + "ping-reply", "r").read())
643 def get_crypttype_preamble(key):
645 type = "Your message was encrypted using PGP 2.x\ncompatibility mode."
647 type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
648 "mode, without IDEA. This message cannot be decoded using PGP 2.x"
652 # Handle a change password email sent to the change password address
653 # (this program called with the chpass argument)
654 def HandleChPass(Reply, DnRecord, Key):
655 # Generate a random password
657 Pass = HashPass(Password)
659 # Use GPG to encrypt it
660 Message = GPGEncrypt("Your new password is '" + Password + "'\n", "0x" + Key[1], Key[4])
664 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
667 Subst["__FROM__"] = ChPassFrom
668 Subst["__EMAIL__"] = EmailAddress(DnRecord)
669 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
670 Subst["__PASSWORD__"] = Message
671 Subst["__ADMIN__"] = ReplyTo
672 Reply = Reply + TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
674 lc = connect_to_ldap_and_check_if_locked(DnRecord)
675 # Modify the password
676 Rec = [(ldap.MOD_REPLACE, "userPassword", "{crypt}" + Pass),
677 (ldap.MOD_REPLACE, "shadowLastChange", str(int(time.time() / (24 * 60 * 60))))]
678 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
684 def HandleChTOTPSeed(Reply, DnRecord, Key):
685 # Generate a random seed
686 seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
687 msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "0x" + Key[1], Key[4])
690 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
693 Subst["__FROM__"] = ChPassFrom
694 Subst["__EMAIL__"] = EmailAddress(DnRecord)
695 Subst["__PASSWORD__"] = msg
696 Subst["__ADMIN__"] = ReplyTo
697 Reply += TemplateSubst(Subst, open(TemplatesDir + "totp-seed-changed", "r").read())
699 lc = connect_to_ldap_and_check_if_locked(DnRecord)
700 # Modify the password
701 Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
702 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
707 def HandleChKrbPass(Reply, DnRecord, Key):
708 # Connect to the ldap server, will throw an exception if account locked.
709 lc = connect_to_ldap_and_check_if_locked(DnRecord)
711 user = GetAttr(DnRecord, "uid")
712 krb_proc = subprocess.Popen(('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
713 krb_proc.stdin.close()
714 out = krb_proc.stdout.readlines()
716 exitcode = krb_proc.returncode
718 # Use GPG to encrypt it
719 m = "Tried to reset your kerberos principal's password.\n"
721 m += "The exitcode of the reset script was zero, indicating that everything\n"
722 m += "worked. However, this being software who knows. Script's output below."
724 m += "The exitcode of the reset script was %d, indicating that something\n" % (exitcode,)
725 m += "went terribly, terribly wrong. Please consult the script's output below\n"
726 m += "for more information. Contact the admins if you have any questions or\n"
727 m += "require assitance."
729 m += "\n" + ''.join(map(lambda x: "| " + x, out))
731 Message = GPGEncrypt(m, "0x" + Key[1], Key[4])
733 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
736 Subst["__FROM__"] = ChPassFrom
737 Subst["__EMAIL__"] = EmailAddress(DnRecord)
738 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
739 Subst["__PASSWORD__"] = Message
740 Subst["__ADMIN__"] = ReplyTo
741 Reply += TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
745 # Start of main program
748 # Drop messages from a mailer daemon.
749 if not os.environ.get('SENDER'):
752 ErrMsg = "Indeterminate Error"
753 ErrType = EX_TEMPFAIL
755 # Startup the replay cache
756 ErrType = EX_TEMPFAIL
757 ErrMsg = "Failed to initialize the replay cache:"
760 ErrType = EX_PERMFAIL
761 ErrMsg = "Failed to understand the email or find a signature:"
762 mail = email.parser.Parser().parse(sys.stdin)
763 Msg = GetClearSig(mail)
765 ErrMsg = "Message is not PGP signed:"
766 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
767 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
768 raise UDFormatError("No PGP signature")
770 # Check the signature
771 ErrMsg = "Unable to check the signature or the signature was invalid:"
772 pgp = GPGCheckSig2(Msg[0])
775 raise UDFormatError(pgp.why)
778 raise UDFormatError("Null signature text")
780 # Extract the plain message text in the event of mime encoding
782 ErrMsg = "Problem stripping MIME headers from the decoded message"
784 e = email.parser.Parser().parsestr(pgp.text)
785 PlainText = e.get_payload(decode=True)
789 # Connect to the ldap server
790 ErrType = EX_TEMPFAIL
791 ErrMsg = "An error occured while performing the LDAP lookup"
794 lc.simple_bind_s("", "")
796 # Search for the matching key fingerprint
797 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "keyFingerPrint={}".format(pgp.key_fpr))
799 ErrType = EX_PERMFAIL
801 raise UDFormatError("Key not found")
803 raise UDFormatError("Oddly your key fingerprint is assigned to more than one account..")
805 # Check the signature against the replay cache
806 RC = ReplayCache(ReplayCacheFile)
807 RC.process(pgp.sig_info)
809 # Determine the sender address
810 ErrMsg = "A problem occured while trying to formulate the reply"
811 Sender = mail.get('Reply-To', mail.get('From'))
813 raise UDFormatError("Unable to determine the sender's address")
816 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
817 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender, ReplyTo, Date)
819 Res = lc.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'])
820 # Res is a list of tuples.
821 # The tuples contain a dn (str) and a dictionary.
822 # The dictionaries map the key "hostname" to a list.
823 # These lists contain a single hostname (str).
824 ValidHostNames = reduce(lambda a, b: a + b, [value.get("hostname", []) for (dn, value) in Res], [])
827 if sys.argv[1] == "ping":
828 Reply = HandlePing(Reply, Attrs[0], pgp.key_info)
829 elif sys.argv[1] == "chpass":
830 if PlainText.strip().find("Please change my Debian password") >= 0:
831 Reply = HandleChPass(Reply, Attrs[0], pgp.key_info)
832 elif PlainText.strip().find("Please change my Kerberos password") >= 0:
833 Reply = HandleChKrbPass(Reply, Attrs[0], pgp.key_info)
834 elif PlainText.strip().find("Please change my TOTP seed") >= 0:
835 Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info)
837 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.")
838 elif sys.argv[1] == "change":
839 Reply = HandleChange(Reply, Attrs[0], pgp.key_info)
842 raise UDFormatError("Incorrect Invokation")
844 # Send the message through sendmail
845 ErrMsg = "A problem occured while trying to send the reply"
846 Child = os.popen("/usr/sbin/sendmail -t", "w")
847 # Child = os.popen("cat","w")
849 if Child.close() is not None:
850 raise UDExecuteError("Sendmail gave a non-zero return code")
854 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
855 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], ReplyTo, Date)
859 Subst["__ERROR__"] = ErrMsg
860 Subst["__ADMIN__"] = ReplyTo
862 Trace = "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
863 List = traceback.extract_tb(sys.exc_traceback)
865 Trace = Trace + "Python Stack Trace:\n"
867 Trace = Trace + " %s %s:%u: %s\n" % (x[2], x[0], x[1], x[3])
869 Subst["__TRACE__"] = Trace
871 # Try to send the bounce
873 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "error-reply", "r").read())
875 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''", "w")
876 Child.write(ErrReplyHead)
877 Child.write(ErrReply)
878 if Child.close() is not None:
879 raise UDExecuteError("Sendmail gave a non-zero return code")
881 sys.exit(EX_TEMPFAIL)
883 if ErrType != EX_PERMFAIL:
889 # vim:set shiftwidth=4: