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
36 TOTPTicketDirectory = ConfModule.totpticketdirectory
37 WebUILocation = ConfModule.webuilocation
39 UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'
40 machine_regex = re.compile("^[0-9a-zA-Z.-]+$")
43 EX_PERMFAIL = 65 # EX_DATAERR
44 Error = 'Message Error'
52 ValidHostNames = [] # will be initialized in later
54 SSHFingerprint = re.compile(r'^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$')
55 SSHRSA1Match = re.compile(r'^^(.* )?\d+ \d+ \d+')
57 ArbChanges = {"c": "..",
59 "facsimileTelephoneNumber": ".*",
60 "telephoneNumber": ".*",
61 "postalAddress": ".*",
65 "emailForward": "^([^<>@]+@.+)?$",
66 "jabberJID": "^([^<>@]+@.+)?$",
71 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
72 "mailDisableMessage": ".*",
73 "mailGreylisting": "^(TRUE|FALSE)$",
74 "mailCallout": "^(TRUE|FALSE)$",
75 "mailDefaultOptions": "^(TRUE|FALSE)$",
77 "mailContentInspectionAction": "^(reject|blackhole|markup)$", }
79 DelItems = {"c": None,
81 "facsimileTelephoneNumber": None,
82 "telephoneNumber": None,
83 "postalAddress": None,
96 "sshRSAAuthKey": None,
98 "mailGreylisting": None,
102 "mailWhitelist": None,
103 "mailDisableMessage": None,
104 "mailDefaultOptions": None,
106 "mailContentInspectionAction": None,
110 # Decode a GPS location from some common forms
111 def LocDecode(Str, Dir):
112 # Check for Decimal degrees, DGM, or DGMS
113 if re.match(r"^[+-]?[\d.]+$", Str) is not None:
121 # Check for DDDxMM.MMMM where x = [nsew]
122 Match = re.match(r"^(\d+)([" + Dir + r"])([\d.]+)$", Str)
130 Match = re.match(r"^([\d.]+) ?([" + Dir + r"])$", Str)
136 # Check for DD:MM.MM x
137 Match = re.match(r"^(\d+):([\d.]+) ?([" + Dir + "])$", Str)
144 # Check for DD:MM:SS.SS x
145 Match = re.match(r"^(\d+):(\d+):([\d.]+) ?([" + Dir + "])$", Str)
155 raise UDFormatError("Bad degrees")
156 if Min is not None and float(Min) > 60:
157 raise UDFormatError("Bad minutes")
158 if Sec is not None and float(Sec) > 60:
159 raise UDFormatError("Bad seconds")
161 # Pad on an extra leading 0 to disambiguate small numbers
162 if len(Deg) <= 1 or Deg[1] == '.':
164 if Min is not None and (len(Min) <= 1 or Min[1] == '.'):
166 if Sec is not None and (len(Sec) <= 1 or Sec[1] == '.'):
169 # Construct a DGM/DGMS type value from the components.
181 # Handle changing a set of arbitary fields
183 def DoArbChange(Str, Attrs):
184 Match = re.match("^([^ :]+): (.*)$", Str)
189 attrName = G[0].lower()
190 for i in ArbChanges.keys():
191 if i.lower() == attrName:
194 if attrName not in ArbChanges:
198 if re.match(ArbChanges[attrName], value) is None:
199 raise UDFormatError("Item does not match the required format" + ArbChanges[attrName])
201 Attrs.append((ldap.MOD_REPLACE, attrName, value))
202 return "Changed entry %s to %s" % (attrName, value)
205 # Handle changing a set of arbitary fields
207 def DoDel(Str, Attrs):
208 Match = re.match("^del (.*)$", Str)
213 attrName = G[0].lower()
214 for i in DelItems.keys():
215 if i.lower() == attrName:
218 if attrName not in DelItems:
219 return "Cannot erase entry %s" % (attrName,)
221 Attrs.append((ldap.MOD_DELETE, attrName, None))
222 return "Removed entry %s" % (attrName)
225 # Handle a position change message, the line format is:
226 # Lat: -12412.23 Long: +12341.2342
227 def DoPosition(Str, Attrs):
228 Match = re.match(r"^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
234 sLat = LocDecode(G[0], "ns")
235 sLong = LocDecode(G[1], "ew")
236 Lat = DecDegree(sLat, 1)
237 Long = DecDegree(sLong, 1)
239 raise UDFormatError("Positions were found, but they are not correctly formed")
241 Attrs.append((ldap.MOD_REPLACE, "latitude", sLat))
242 Attrs.append((ldap.MOD_REPLACE, "longitude", sLong))
243 return "Position set to %s/%s (%s/%s decimal degrees)" % (sLat, sLong, Lat, Long)
246 # Load bad ssh fingerprints
248 f = open(SSHFingerprintFile, "r")
250 FingerprintLine = re.compile(r'^([0-9a-f:]{47}).*$')
251 for line in f.readlines():
252 Match = FingerprintLine.match(line)
253 if Match is not None:
259 # Handle an SSH authentication key, the line format is:
260 # [options] 1024 35 13188913666680[..] [comment]
261 # maybe it really should be:
262 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
263 def DoSSH(Str, Attrs, badkeys, uid):
264 Match = SSH2AuthSplit.match(Str)
270 Match = SSHRSA1Match.match(Str)
271 if Match is not None:
272 return "RSA1 keys not supported anymore"
275 # lines can now be prepended with "allowed_hosts=machine1,machine2 "
277 if Str.startswith("allowed_hosts="):
278 Str = Str.split("=", 1)[1]
280 return "invalid ssh key syntax with machine specification"
281 machines, Str = Str.split(' ', 1)
282 machines = machines.split(",")
285 return "empty machine specification for ssh key"
286 if not machine_regex.match(m):
287 return "machine specification for ssh key contains invalid characters"
288 if m not in ValidHostNames:
289 return "unknown machine {} used in allowed_hosts stanza for ssh keys".format(m)
291 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
293 f.write("%s\n" % (Str))
295 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
296 (result, output) = commands.getstatusoutput(cmd)
299 raise UDExecuteError("ssh-keygen -l invocation failed!\n%s\n" % (output))
301 # format the string again for ldap:
303 Str = "allowed_hosts=%s %s" % (",".join(machines), Str)
306 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
307 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], os.environ['SENDER'], ReplyTo, Date)
309 Subst["__ADMIN__"] = ReplyTo
310 Subst["__USER__"] = uid
312 Match = SSHFingerprint.match(output)
314 return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?"
320 key_size_ok = (int(key_size) >= 2048)
321 elif typekey == "ed25519":
327 return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys."
328 elif fingerprint in badkeys:
331 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
332 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "admin-info", "r").read())
334 Child = os.popen("/usr/sbin/sendmail -t", "w")
335 Child.write(ErrReplyHead)
336 Child.write(ErrReply)
337 if Child.close() is not None:
338 raise UDExecuteError("Sendmail gave a non-zero return code")
340 sys.exit(EX_TEMPFAIL)
342 # And now break and stop processing input, which sends a reply to the user.
343 raise UDFormatError("Submitted SSH key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL")
347 Attrs.append((ldap.MOD_ADD, "sshRSAAuthKey", Str))
348 return "SSH Key added: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
350 Attrs.append((ldap.MOD_REPLACE, "sshRSAAuthKey", Str))
352 return "SSH Keys replaced with: %s %s [%s]" % (key_size, fingerprint, FormatSSHAuth(Str))
355 # Handle changing a dns entry
356 # host IN A 12.12.12.12
357 # host IN AAAA 1234::5678
358 # host IN CNAME foo.bar. <- Trailing dot is required
359 # host IN MX foo.bar. <- Trailing dot is required
360 def DoDNS(Str, Attrs, DnRecord):
361 cnamerecord = re.match(r"^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$", Str, re.IGNORECASE)
362 arecord = re.match(r'^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$', Str, re.IGNORECASE)
363 mxrecord = re.match(r"^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$", Str, re.IGNORECASE)
364 txtrecord = re.match(r"^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
365 aaaarecord = re.match(r'^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$', Str, re.IGNORECASE)
367 if cnamerecord is None and\
369 mxrecord is None and\
370 txtrecord is None and\
374 # Check if the name is already taken
375 G = re.match(r'^([-\w+]+)\s', Str)
377 raise UDFormatError("Hostname not found although we already passed record syntax checks")
378 hostname = G.group(1)
380 # Check for collisions
382 # [JT 20070409 - search for both tab and space suffixed hostnames
383 # since we accept either. It'd probably be better to parse the
384 # incoming string in order to construct what we feed LDAP rather
385 # than just passing it through as is.]
386 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
387 Rec = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, filter, ["uid"])
389 if GetAttr(x, "uid") != GetAttr(DnRecord, "uid"):
390 return "DNS entry is already owned by " + GetAttr(x, "uid")
397 return "CNAME and other RR types not allowed: " + Str
401 if DNS.get(hostname) == 2:
402 return "CNAME and other RR types not allowed: " + Str
406 if cnamerecord is not None:
407 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
408 elif txtrecord is not None:
409 sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1))
410 elif arecord is not None:
411 ipaddress = arecord.group(1)
412 for quad in ipaddress.split('.'):
413 if not (int(quad) >= 0 and int(quad) <= 255):
414 return "Invalid quad %s in IP address %s in line %s" % (quad, ipaddress, Str)
415 sanitized = "%s IN A %s" % (hostname, ipaddress)
416 elif mxrecord is not None:
417 priority = mxrecord.group(1)
418 mx = mxrecord.group(2)
419 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
420 elif aaaarecord is not None:
421 ipv6address = aaaarecord.group(1)
422 parts = ipv6address.split(':')
424 return "Invalid IPv6 address (%s): too many parts" % (ipv6address)
426 return "Invalid IPv6 address (%s): too few parts" % (ipv6address)
431 seenEmptypart = False
434 return "Invalid IPv6 address (%s): part %s is longer than 4 characters" % (ipv6address, p)
437 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed" % (ipv6address)
439 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
441 raise UDFormatError("None of the types I recognize was it. I shouldn't be here. confused.")
444 Attrs.append((ldap.MOD_ADD, "dnsZoneEntry", sanitized))
445 return "DNS Entry added " + sanitized
447 Attrs.append((ldap.MOD_REPLACE, "dnsZoneEntry", sanitized))
449 return "DNS Entry replaced with " + sanitized
452 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
453 def DoRBL(Str, Attrs):
454 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
458 if Match.group(1) == "rbl":
460 if Match.group(1) == "rhsbl":
462 if Match.group(1) == "whitelist":
463 Key = "mailWhitelist"
464 Host = Match.group(2)
468 Attrs.append((ldap.MOD_ADD, Key, Host))
469 return "%s added %s" % (Key, Host)
471 Attrs.append((ldap.MOD_REPLACE, Key, Host))
473 return "%s replaced with %s" % (Key, Host)
476 # Handle a ConfirmSudoPassword request
477 def DoConfirmSudopassword(Str, SudoPasswd):
478 Match = re.compile('^confirm sudopassword (' + UUID_FORMAT + ') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str)
482 uuid = Match.group(1)
483 hosts = Match.group(2)
484 hmac = Match.group(3)
486 SudoPasswd[uuid] = (hosts, hmac)
487 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid, hosts, hmac)
490 def FinishConfirmSudopassword(lc, uid, Attrs, SudoPasswd):
493 if len(SudoPasswd) == 0:
496 res = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + uid, ['sudoPassword'])
498 raise UDFormatError("Not exactly one hit when searching for user")
499 if 'sudoPassword' in res[0][1]:
500 inldap = res[0][1]['sudoPassword']
506 Match = re.compile('^(' + UUID_FORMAT + ') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry)
508 raise UDFormatError("Could not parse existing sudopasswd entry")
509 uuid = Match.group(1)
510 status = Match.group(2)
511 hosts = Match.group(3)
512 cryptedpass = Match.group(4)
514 if uuid in SudoPasswd:
515 confirmedHosts = SudoPasswd[uuid][0]
516 confirmedHmac = SudoPasswd[uuid][1]
517 if status.startswith('confirmed:'):
518 if status == 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
519 result += "Entry %s for sudo password on hosts %s already confirmed.\n" % (uuid, hosts)
521 result += "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n" % (uuid, hosts)
522 elif confirmedHosts != hosts:
523 result += "Entry %s hostlist mismatch (%s vs. %s).\n" % (uuid, hosts, confirmedHosts)
524 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
525 result += "Entry %s for sudo password on hosts %s now confirmed.\n" % (uuid, hosts)
526 status = 'confirmed:' + make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
528 result += "Entry %s for sudo password on hosts %s HMAC verify failed.\n" % (uuid, hosts)
531 newentry = " ".join([uuid, status, hosts, cryptedpass])
532 if len(newldap) == 0:
533 newldap.append((ldap.MOD_REPLACE, "sudoPassword", newentry))
535 newldap.append((ldap.MOD_ADD, "sudoPassword", newentry))
537 for entry in SudoPasswd:
538 result += "Entry %s that you confirm is not listed in ldap." % (entry,)
540 for entry in newldap:
546 def connect_to_ldap_and_check_if_locked(DnRecord):
547 # Connect to the ldap server
549 F = open(PassDir + "/pass-" + pwd.getpwuid(os.getuid())[0], "r")
550 AccessPass = F.readline().strip().split(" ")
552 lc.simple_bind_s("uid={},{}".format(AccessPass[0], BaseDn), AccessPass[1])
554 # Check for a locked account
555 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
556 if (GetAttr(Attrs[0], "userPassword").find("*LK*") != -1) \
557 or GetAttr(Attrs[0], "userPassword").startswith("!"):
558 raise UDNotAllowedError("This account is locked")
562 # Handle an [almost] arbitary change
563 def HandleChange(Reply, DnRecord, Key):
565 Lines = re.split("\n *\r?", PlainText)
577 # Try to process a command line
578 Result += "> " + Line + "\n"
584 badkeys = LoadBadSSH()
585 Res = DoPosition(Line, Attrs) or DoDNS(Line, Attrs, DnRecord) or \
586 DoArbChange(Line, Attrs) or DoSSH(Line, Attrs, badkeys, GetAttr(DnRecord, "uid")) or \
587 DoDel(Line, Attrs) or DoRBL(Line, Attrs) or DoConfirmSudopassword(Line, SudoPasswd)
590 Result += "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
592 # Fail, if someone tries to send someone elses signed email to the
593 # daemon then we want to abort ASAP.
596 Result = Result + "Command is not understood. Halted - no changes committed\n"
600 # Connect to the ldap server
601 lc = connect_to_ldap_and_check_if_locked(DnRecord)
603 if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go
605 Res = FinishConfirmSudopassword(lc, GetAttr(DnRecord, "uid"), Attrs, SudoPasswd)
610 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n" % (e)
612 if CommitChanges == 1 and len(Attrs) > 0:
613 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
614 lc.modify_s(Dn, Attrs)
618 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + GetAttr(DnRecord, "uid"))
620 raise UDNotAllowedError("User not found")
621 Attribs = GPGEncrypt(PrettyShow(Attrs[0]) + "\n", "0x" + Key[1], Key[4])
624 Subst["__FROM__"] = ChangeFrom
625 Subst["__EMAIL__"] = EmailAddress(DnRecord)
626 Subst["__ADMIN__"] = ReplyTo
627 Subst["__RESULT__"] = Result
628 Subst["__ATTR__"] = Attribs
630 return Reply + TemplateSubst(Subst, open(TemplatesDir + "change-reply", "r").read())
633 # Handle ping handles an email sent to the 'ping' address (ie this program
634 # called with a ping argument) It replies with a dump of the public records.
635 def HandlePing(Reply, DnRecord, Key):
637 Subst["__FROM__"] = PingFrom
638 Subst["__EMAIL__"] = EmailAddress(DnRecord)
639 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord)
640 Subst["__ADMIN__"] = ReplyTo
642 return Reply + TemplateSubst(Subst, open(TemplatesDir + "ping-reply", "r").read())
645 def get_crypttype_preamble(key):
647 type = "Your message was encrypted using PGP 2.x\ncompatibility mode."
649 type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
650 "mode, without IDEA. This message cannot be decoded using PGP 2.x"
654 # Handle a change password email sent to the change password address
655 # (this program called with the chpass argument)
656 def HandleChPass(Reply, DnRecord, Key):
657 # Generate a random password
659 Pass = HashPass(Password)
661 # Use GPG to encrypt it
662 Message = GPGEncrypt("Your new password is '" + Password + "'\n", "0x" + Key[1], Key[4])
666 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
669 Subst["__FROM__"] = ChPassFrom
670 Subst["__EMAIL__"] = EmailAddress(DnRecord)
671 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
672 Subst["__PASSWORD__"] = Message
673 Subst["__ADMIN__"] = ReplyTo
674 Reply = Reply + TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
676 lc = connect_to_ldap_and_check_if_locked(DnRecord)
677 # Modify the password
678 Rec = [(ldap.MOD_REPLACE, "userPassword", "{crypt}" + Pass),
679 (ldap.MOD_REPLACE, "shadowLastChange", str(int(time.time() / (24 * 60 * 60))))]
680 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
686 def HandleChTOTPSeed(Reply, DnRecord, Key):
687 # Generate a random seed
688 seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
689 random_id = binascii.hexlify(open("/dev/urandom", "r").read(32))
690 totp_file_name = "%d-%s" % (time.time(), random_id,)
692 msg = GPGEncrypt("Please go to %s/fetch-totp-seed.cgi?id=%s\n to fetch your TOTP seed" % (WebUILocation, totp_file_name), "0x" + Key[1], Key[4])
695 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
698 Subst["__FROM__"] = ChPassFrom
699 Subst["__EMAIL__"] = EmailAddress(DnRecord)
700 Subst["__PASSWORD__"] = msg
701 Subst["__ADMIN__"] = ReplyTo
702 Reply += TemplateSubst(Subst, open(TemplatesDir + "totp-seed-changed", "r").read())
704 lc = connect_to_ldap_and_check_if_locked(DnRecord)
705 # Save the seed so the user can pick it up.
706 f = open(os.path.join(TOTPTicketDirectory, totp_file_name), os.O_WRONLY | os.O_CREAT)
710 # Modify the password
711 Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
712 Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn
717 def HandleChKrbPass(Reply, DnRecord, Key):
718 # Connect to the ldap server, will throw an exception if account locked.
719 lc = connect_to_ldap_and_check_if_locked(DnRecord)
721 user = GetAttr(DnRecord, "uid")
722 krb_proc = subprocess.Popen(('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
723 krb_proc.stdin.close()
724 out = krb_proc.stdout.readlines()
726 exitcode = krb_proc.returncode
728 # Use GPG to encrypt it
729 m = "Tried to reset your kerberos principal's password.\n"
731 m += "The exitcode of the reset script was zero, indicating that everything\n"
732 m += "worked. However, this being software who knows. Script's output below."
734 m += "The exitcode of the reset script was %d, indicating that something\n" % (exitcode,)
735 m += "went terribly, terribly wrong. Please consult the script's output below\n"
736 m += "for more information. Contact the admins if you have any questions or\n"
737 m += "require assitance."
739 m += "\n" + ''.join(map(lambda x: "| " + x, out))
741 Message = GPGEncrypt(m, "0x" + Key[1], Key[4])
743 raise UDFormatError("Unable to generate the encrypted reply, gpg failed.")
746 Subst["__FROM__"] = ChPassFrom
747 Subst["__EMAIL__"] = EmailAddress(DnRecord)
748 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
749 Subst["__PASSWORD__"] = Message
750 Subst["__ADMIN__"] = ReplyTo
751 Reply += TemplateSubst(Subst, open(TemplatesDir + "passwd-changed", "r").read())
755 # Start of main program
758 # Drop messages from a mailer daemon.
759 if not os.environ.get('SENDER'):
762 ErrMsg = "Indeterminate Error"
763 ErrType = EX_TEMPFAIL
765 # Startup the replay cache
766 ErrType = EX_TEMPFAIL
767 ErrMsg = "Failed to initialize the replay cache:"
770 ErrType = EX_PERMFAIL
771 ErrMsg = "Failed to understand the email or find a signature:"
772 mail = email.parser.Parser().parse(sys.stdin)
773 Msg = GetClearSig(mail)
775 ErrMsg = "Message is not PGP signed:"
776 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
777 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
778 raise UDFormatError("No PGP signature")
780 # Check the signature
781 ErrMsg = "Unable to check the signature or the signature was invalid:"
782 pgp = GPGCheckSig2(Msg[0])
785 raise UDFormatError(pgp.why)
788 raise UDFormatError("Null signature text")
790 # Extract the plain message text in the event of mime encoding
792 ErrMsg = "Problem stripping MIME headers from the decoded message"
794 e = email.parser.Parser().parsestr(pgp.text)
795 PlainText = e.get_payload(decode=True)
799 # Connect to the ldap server
800 ErrType = EX_TEMPFAIL
801 ErrMsg = "An error occured while performing the LDAP lookup"
804 lc.simple_bind_s("", "")
806 # Search for the matching key fingerprint
807 Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "keyFingerPrint={}".format(pgp.key_fpr))
809 ErrType = EX_PERMFAIL
811 raise UDFormatError("Key not found")
813 raise UDFormatError("Oddly your key fingerprint is assigned to more than one account..")
815 # Check the signature against the replay cache
816 RC = ReplayCache(ReplayCacheFile)
817 RC.process(pgp.sig_info)
819 # Determine the sender address
820 ErrMsg = "A problem occured while trying to formulate the reply"
821 Sender = mail.get('Reply-To', mail.get('From'))
823 raise UDFormatError("Unable to determine the sender's address")
826 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
827 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender, ReplyTo, Date)
829 Res = lc.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'])
830 # Res is a list of tuples.
831 # The tuples contain a dn (str) and a dictionary.
832 # The dictionaries map the key "hostname" to a list.
833 # These lists contain a single hostname (str).
834 ValidHostNames = reduce(lambda a, b: a + b, [value.get("hostname", []) for (dn, value) in Res], [])
837 if sys.argv[1] == "ping":
838 Reply = HandlePing(Reply, Attrs[0], pgp.key_info)
839 elif sys.argv[1] == "chpass":
840 if PlainText.strip().find("Please change my Debian password") >= 0:
841 Reply = HandleChPass(Reply, Attrs[0], pgp.key_info)
842 elif PlainText.strip().find("Please change my Kerberos password") >= 0:
843 Reply = HandleChKrbPass(Reply, Attrs[0], pgp.key_info)
844 elif PlainText.strip().find("Please change my TOTP seed") >= 0:
845 Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info)
847 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.")
848 elif sys.argv[1] == "change":
849 Reply = HandleChange(Reply, Attrs[0], pgp.key_info)
852 raise UDFormatError("Incorrect Invokation")
854 # Send the message through sendmail
855 ErrMsg = "A problem occured while trying to send the reply"
856 Child = os.popen("/usr/sbin/sendmail -t", "w")
857 # Child = os.popen("cat","w")
859 if Child.close() is not None:
860 raise UDExecuteError("Sendmail gave a non-zero return code")
864 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(time.time()))
865 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'], ReplyTo, Date)
869 Subst["__ERROR__"] = ErrMsg
870 Subst["__ADMIN__"] = ReplyTo
872 Trace = "==> %s: %s\n" % (sys.exc_type, sys.exc_value)
873 List = traceback.extract_tb(sys.exc_traceback)
875 Trace = Trace + "Python Stack Trace:\n"
877 Trace = Trace + " %s %s:%u: %s\n" % (x[2], x[0], x[1], x[3])
879 Subst["__TRACE__"] = Trace
881 # Try to send the bounce
883 ErrReply = TemplateSubst(Subst, open(TemplatesDir + "error-reply", "r").read())
885 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''", "w")
886 Child.write(ErrReplyHead)
887 Child.write(ErrReply)
888 if Child.close() is not None:
889 raise UDExecuteError("Sendmail gave a non-zero return code")
891 sys.exit(EX_TEMPFAIL)
893 if ErrType != EX_PERMFAIL:
899 # vim:set shiftwidth=4: