4 # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008
5 # Copyright (c) 2009 Stephen Gran <steve@lobefin.net>
6 # Copyright (c) 2008 Peter Palfrader <peter@palfrader.org>
7 # Copyright (c) 2008 Joerg Jaspert <joerg@debian.org>
8 # Copyright (c) 2010 Helmut Grohne <helmut@subdivi.de>
10 import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands
13 from userdir_gpg import *
14 from userdir_ldap import *
15 from userdir_exceptions import *
17 # Error codes from /usr/include/sysexits.h
18 ReplyTo = ConfModule.replyto;
19 PingFrom = ConfModule.pingfrom;
20 ChPassFrom = ConfModule.chpassfrom;
21 ChangeFrom = ConfModule.changefrom;
22 ReplayCacheFile = ConfModule.replaycachefile;
23 SSHFingerprintFile = ConfModule.fingerprintfile
25 UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'
28 EX_PERMFAIL = 65; # EX_DATAERR
29 Error = 'Message Error';
39 SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$')
40 SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+')
42 GenderTable = {"male": 1,
50 ArbChanges = {"c": "..",
52 "facsimileTelephoneNumber": ".*",
53 "telephoneNumber": ".*",
54 "postalAddress": ".*",
58 "emailForward": "^([^<>@]+@.+)?$",
59 "jabberJID": "^([^<>@]+@.+)?$",
64 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
65 "mailDisableMessage": ".*",
66 "mailGreylisting": "^(TRUE|FALSE)$",
67 "mailCallout": "^(TRUE|FALSE)$",
68 "mailDefaultOptions": "^(TRUE|FALSE)$",
70 "gender": "^(1|2|9|male|female|unspecified)$",
71 "mailContentInspectionAction": "^(reject|blackhole|markup)$",
74 DelItems = {"c": None,
76 "facsimileTelephoneNumber": None,
77 "telephoneNumber": None,
78 "postalAddress": None,
91 "sshRSAAuthKey": None,
93 "mailGreylisting": None,
97 "mailWhitelist": None,
98 "mailDisableMessage": None,
99 "mailDefaultOptions": None,
101 "mailContentInspectionAction": None,
105 # Decode a GPS location from some common forms
106 def LocDecode(Str,Dir):
107 # Check for Decimal degrees, DGM, or DGMS
108 if re.match("^[+-]?[\d.]+$",Str) != None:
111 Deg = '0'; Min = None; Sec = None; Dr = Dir[0];
113 # Check for DDDxMM.MMMM where x = [nsew]
114 Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str);
117 Deg = G[0]; Min = G[2]; Dr = G[1];
120 Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str);
123 Deg = G[0]; Dr = G[1];
125 # Check for DD:MM.MM x
126 Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str);
129 Deg = G[0]; Min = G[1]; Dr = G[2];
131 # Check for DD:MM:SS.SS x
132 Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str);
135 Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3];
139 raise UDFormatError, "Bad degrees";
140 if Min != None and float(Min) > 60:
141 raise UDFormatError, "Bad minutes";
142 if Sec != None and float(Sec) > 60:
143 raise UDFormatError, "Bad seconds";
145 # Pad on an extra leading 0 to disambiguate small numbers
146 if len(Deg) <= 1 or Deg[1] == '.':
148 if Min != None and (len(Min) <= 1 or Min[1] == '.'):
150 if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'):
153 # Construct a DGM/DGMS type value from the components.
164 # Handle changing a set of arbitary fields
166 def DoArbChange(Str,Attrs):
167 Match = re.match("^([^ :]+): (.*)$",Str);
172 attrName = G[0].lower();
173 for i in ArbChanges.keys():
174 if i.lower() == attrName:
177 if ArbChanges.has_key(attrName) == 0:
180 if re.match(ArbChanges[attrName],G[1]) == None:
181 raise UDFormatError, "Item does not match the required format"+ArbChanges[attrName];
184 if attrName == 'gender':
185 if G[1] not in GenderTable:
186 raise UDFormatError, "Gender not found in table"
187 value = GenderTable[G[1]]
189 # if attrName == 'birthDate':
190 # (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",G[1]) {
191 # $bd_yr = $1; $bd_mo = $2; $bd_day = $3;
192 # if ($bd_mo > 0 and $bd_mo <= 12 and $bd_day > 0) {
194 # if ($bd_day == 29 and ($bd_yr == 0 or ($bd_yr % 4 == 0 && ($bd_yr % 100 != 0 || $bd_yr % 400 == 0)))) {
196 # } elsif ($bd_day <= 28) {
199 # } elsif ($bd_mo == 4 or $bd_mo == 6 or $bd_mo == 9 or $bd_mo == 11) {
200 # if ($bd_day <= 30) {
204 # if ($bd_day <= 31) {
209 # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) {
212 Attrs.append((ldap.MOD_REPLACE,attrName,value));
213 return "Changed entry %s to %s"%(attrName,value);
215 # Handle changing a set of arbitary fields
217 def DoDel(Str,Attrs):
218 Match = re.match("^del (.*)$",Str);
223 attrName = G[0].lower();
224 for i in DelItems.keys():
225 if i.lower() == attrName:
228 if DelItems.has_key(attrName) == 0:
229 return "Cannot erase entry %s"%(attrName);
231 Attrs.append((ldap.MOD_DELETE,attrName,None));
232 return "Removed entry %s"%(attrName);
234 # Handle a position change message, the line format is:
235 # Lat: -12412.23 Long: +12341.2342
236 def DoPosition(Str,Attrs):
237 Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
243 sLat = LocDecode(G[0],"ns");
244 sLong = LocDecode(G[1],"ew");
245 Lat = DecDegree(sLat,1);
246 Long = DecDegree(sLong,1);
248 raise UDFormatError, "Positions were found, but they are not correctly formed";
250 Attrs.append((ldap.MOD_REPLACE,"latitude",sLat));
251 Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
252 return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long);
254 # Load bad ssh fingerprints
256 f = open(SSHFingerprintFile, "r")
258 FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$')
259 for line in f.readlines():
260 Match = FingerprintLine.match(line)
261 if Match is not None:
266 # Handle an SSH authentication key, the line format is:
267 # [options] 1024 35 13188913666680[..] [comment]
268 # maybe it really should be:
269 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
270 machine_regex = re.compile("^[0-9a-zA-Z.-]+$")
271 def DoSSH(Str, Attrs, badkeys, uid):
272 Match = SSH2AuthSplit.match(Str);
278 Match = SSHRSA1Match.match(Str)
279 if Match is not None:
280 return "RSA1 keys not supported anymore"
283 # lines can now be prepended with "allowed_hosts=machine1,machine2 "
285 if Str.startswith("allowed_hosts="):
286 Str = Str.split("=", 1)[1]
288 return "invalid ssh key syntax with machine specification"
289 machines, Str = Str.split(' ', 1)
290 machines = machines.split(",")
293 return "empty machine specification for ssh key"
294 if not machine_regex.match(m):
295 return "machine specification for ssh key contains invalid characters"
297 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
299 f.write("%s\n" % (Str))
301 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
302 (result, output) = commands.getstatusoutput(cmd)
305 raise UDExecuteError, "ssh-keygen -l invocation failed!\n%s\n" % (output)
307 # format the string again for ldap:
309 Str = "allowed_hosts=%s %s" % (",".join(machines), Str)
313 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()))
314 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],os.environ['SENDER'],ReplyTo,Date)
316 Subst["__ADMIN__"] = ReplyTo
317 Subst["__USER__"] = uid
319 Match = SSHFingerprint.match(output)
325 Subst["__ERROR__"] = "SSH keysize %s is below limit 1024" % (g[0])
326 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
328 Child = os.popen("/usr/sbin/sendmail -t","w")
329 Child.write(ErrReplyHead)
330 Child.write(ErrReply)
331 if Child.close() != None:
332 raise UDExecuteError, "Sendmail gave a non-zero return code"
334 sys.exit(EX_TEMPFAIL)
336 # And now break and stop processing input, which sends a reply to the user.
337 raise UDFormatError, "SSH keys must have at least 1024 bits, processing halted, NOTHING MODIFIED AT ALL"
338 elif g[1] in badkeys:
341 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
342 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
344 Child = os.popen("/usr/sbin/sendmail -t","w")
345 Child.write(ErrReplyHead)
346 Child.write(ErrReply)
347 if Child.close() != None:
348 raise UDExecuteError, "Sendmail gave a non-zero return code"
350 sys.exit(EX_TEMPFAIL)
352 # And now break and stop processing input, which sends a reply to the user.
353 raise UDFormatError, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL"
355 if (typekey == "dss"):
356 return "DSA keys not accepted anymore"
360 Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str));
361 return "SSH Key added "+FormatSSHAuth(Str);
363 Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str));
365 return "SSH Keys replaced with "+FormatSSHAuth(Str);
367 # Handle changing a dns entry
368 # host IN A 12.12.12.12
369 # host IN AAAA 1234::5678
370 # host IN CNAME foo.bar. <- Trailing dot is required
371 # host IN MX foo.bar. <- Trailing dot is required
372 def DoDNS(Str,Attrs,DnRecord):
373 cnamerecord = re.match("^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$",Str,re.IGNORECASE)
374 arecord = re.match('^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$',Str,re.IGNORECASE)
375 mxrecord = re.match("^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$",Str,re.IGNORECASE)
376 #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE)
377 aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE)
379 if cnamerecord == None and\
381 mxrecord == None and\
385 # Check if the name is already taken
386 G = re.match('^([-\w+]+)\s',Str)
388 raise UDFormatError, "Hostname not found although we already passed record syntax checks"
389 hostname = G.group(1)
391 # Check for collisions
393 # [JT 20070409 - search for both tab and space suffixed hostnames
394 # since we accept either. It'd probably be better to parse the
395 # incoming string in order to construct what we feed LDAP rather
396 # than just passing it through as is.]
397 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
398 Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,filter,["uid"]);
400 if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"):
401 return "DNS entry is already owned by " + GetAttr(x,"uid")
407 if DNS.has_key(hostname):
408 return "CNAME and other RR types not allowed: "+Str
412 if DNS.has_key(hostname) and DNS[hostname] == 2:
413 return "CNAME and other RR types not allowed: "+Str
417 if cnamerecord != None:
418 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
419 elif arecord != None:
420 ipaddress = arecord.group(1)
421 for quad in ipaddress.split('.'):
422 if not (int(quad) >=0 and int(quad) <= 255):
423 return "Invalid quad %s in IP address %s in line %s" %(quad, ipaddress, Str)
424 sanitized = "%s IN A %s"% (hostname, ipaddress)
425 elif mxrecord != None:
426 priority = mxrecord.group(1)
427 mx = mxrecord.group(2)
428 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
429 elif aaaarecord != None:
430 ipv6address = aaaarecord.group(1)
431 parts = ipv6address.split(':')
433 return "Invalid IPv6 address (%s): too many parts"%(ipv6address)
435 return "Invalid IPv6 address (%s): too few parts"%(ipv6address)
440 seenEmptypart = False
443 return "Invalid IPv6 address (%s): part %s is longer than 4 characters"%(ipv6address, p)
446 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed"%(ipv6address)
448 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
450 raise UDFormatError, "None of the types I recognize was it. I shouldn't be here. confused."
453 Attrs.append((ldap.MOD_ADD,"dnsZoneEntry",sanitized));
454 return "DNS Entry added "+sanitized;
456 Attrs.append((ldap.MOD_REPLACE,"dnsZoneEntry",sanitized));
458 return "DNS Entry replaced with "+sanitized;
460 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
461 def DoRBL(Str,Attrs):
462 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
466 if Match.group(1) == "rbl":
468 if Match.group(1) == "rhsbl":
470 if Match.group(1) == "whitelist":
471 Key = "mailWhitelist"
472 Host = Match.group(2)
475 if SeenList.has_key(Key):
476 Attrs.append((ldap.MOD_ADD,Key,Host))
477 return "%s added %s" % (Key,Host)
479 Attrs.append((ldap.MOD_REPLACE,Key,Host))
481 return "%s replaced with %s" % (Key,Host)
483 # Handle a ConfirmSudoPassword request
484 def DoConfirmSudopassword(Str):
485 Match = re.compile('^confirm sudopassword ('+UUID_FORMAT+') ([a-z0-9.,*]+) ([0-9a-f]{40})$').match(Str)
489 uuid = Match.group(1)
490 hosts = Match.group(2)
491 hmac = Match.group(3)
494 SudoPasswd[uuid] = (hosts, hmac)
495 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid,hosts, hmac)
497 def FinishConfirmSudopassword(l, uid, Attrs):
501 res = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+uid, ['sudoPassword']);
503 raise UDFormatError, "Not exactly one hit when searching for user"
504 if res[0][1].has_key('sudoPassword'):
505 inldap = res[0][1]['sudoPassword']
511 Match = re.compile('^('+UUID_FORMAT+') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*]+) ([^ ]+)$').match(entry)
513 raise UDFormatError, "Could not parse existing sudopasswd entry"
514 uuid = Match.group(1)
515 status = Match.group(2)
516 hosts = Match.group(3)
517 cryptedpass = Match.group(4)
519 if SudoPasswd.has_key(uuid):
520 confirmedHosts = SudoPasswd[uuid][0]
521 confirmedHmac = SudoPasswd[uuid][1]
522 if status.startswith('confirmed:'):
523 if status == 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
524 result = result + "Entry %s for sudo password on hosts %s already confirmed.\n"%(uuid, hosts)
526 result = result + "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n"%(uuid, hosts)
527 elif confirmedHosts != hosts:
528 result = result + "Entry %s hostlist mismatch (%s vs. %s).\n"%(uuid, hosts, confirmedHosts)
529 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
530 result = result + "Entry %s for sudo password on hosts %s now confirmed.\n"%(uuid, hosts)
531 status = 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
533 result = result + "Entry %s for sudo password on hosts %s HMAC verify failed.\n"%(uuid, hosts)
536 newentry = " ".join([uuid, status, hosts, cryptedpass])
537 if len(newldap) == 0:
538 newldap.append((ldap.MOD_REPLACE,"sudoPassword",newentry))
540 newldap.append((ldap.MOD_ADD,"sudoPassword",newentry))
542 for entry in SudoPasswd:
543 result = result + "Entry %s that you confirm is not listed in ldap."%(entry)
545 for entry in newldap:
550 # Handle an [almost] arbitary change
551 def HandleChange(Reply,DnRecord,Key):
553 Lines = re.split("\n *\r?",PlainText);
564 # Try to process a command line
565 Result = Result + "> "+Line+"\n";
571 badkeys = LoadBadSSH()
572 Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \
573 DoArbChange(Line,Attrs) or DoSSH(Line,Attrs,badkeys,GetAttr(DnRecord,"uid")) or \
574 DoDel(Line,Attrs) or DoRBL(Line,Attrs) or DoConfirmSudopassword(Line)
577 Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
579 # Fail, if someone tries to send someone elses signed email to the
580 # daemon then we want to abort ASAP.
583 Result = Result + "Command is not understood. Halted - no changes committed\n";
585 Result = Result + Res + "\n";
587 # Connect to the ldap server
589 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
590 AccessPass = F.readline().strip().split(" ")
593 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
594 oldAttrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
595 if ((GetAttr(oldAttrs[0],"userPassword").find("*LK*") != -1)
596 or GetAttr(oldAttrs[0],"userPassword").startswith("!")):
597 raise UDNotAllowedError, "This account is locked";
599 if CommitChanges == 1: # only if we are still good to go
601 Res = FinishConfirmSudopassword(l, GetAttr(DnRecord,"uid"), Attrs)
602 Result = Result + Res + "\n";
605 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n"%(e);
608 if CommitChanges == 1:
609 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
610 l.modify_s(Dn,Attrs);
614 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
616 raise UDNotAllowedError, "User not found"
617 Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]);
620 Subst["__FROM__"] = ChangeFrom;
621 Subst["__EMAIL__"] = EmailAddress(DnRecord);
622 Subst["__ADMIN__"] = ReplyTo;
623 Subst["__RESULT__"] = Result;
624 Subst["__ATTR__"] = Attribs;
626 return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read());
628 # Handle ping handles an email sent to the 'ping' address (ie this program
629 # called with a ping argument) It replies with a dump of the public records.
630 def HandlePing(Reply,DnRecord,Key):
632 Subst["__FROM__"] = PingFrom;
633 Subst["__EMAIL__"] = EmailAddress(DnRecord);
634 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord);
635 Subst["__ADMIN__"] = ReplyTo;
637 return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read());
639 # Handle a change password email sent to the change password address
640 # (this program called with the chpass argument)
641 def HandleChPass(Reply,DnRecord,Key):
642 # Generate a random password
643 Password = GenPass();
644 Pass = HashPass(Password);
646 # Use GPG to encrypt it
647 Message = GPGEncrypt("Your new password is '" + Password + "'\n",\
652 raise UDFormatError, "Unable to generate the encrypted reply, gpg failed.";
655 Type = "Your message was encrypted using PGP 2.x\ncompatibility mode.";
657 Type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
658 "mode, without IDEA. This message cannot be decoded using PGP 2.x";
661 Subst["__FROM__"] = ChPassFrom;
662 Subst["__EMAIL__"] = EmailAddress(DnRecord);
663 Subst["__CRYPTTYPE__"] = Type;
664 Subst["__PASSWORD__"] = Message;
665 Subst["__ADMIN__"] = ReplyTo;
666 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
668 # Connect to the ldap server
670 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
671 AccessPass = F.readline().strip().split(" ")
673 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
675 # Check for a locked account
676 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
677 if (GetAttr(Attrs[0],"userPassword").find("*LK*") != -1) \
678 or GetAttr(Attrs[0],"userPassword").startswith("!"):
679 raise UDNotAllowedError, "This account is locked";
681 # Modify the password
682 Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass),
683 (ldap.MOD_REPLACE,"shadowLastChange",str(int(time.time()/24/60/60)))];
684 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
689 # Start of main program
691 # Drop messages from a mailer daemon.
692 if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0:
695 ErrMsg = "Indeterminate Error";
696 ErrType = EX_TEMPFAIL;
698 # Startup the replay cache
699 ErrType = EX_TEMPFAIL;
700 ErrMsg = "Failed to initialize the replay cache:";
703 ErrType = EX_PERMFAIL;
704 ErrMsg = "Failed to understand the email or find a signature:";
705 Email = mimetools.Message(sys.stdin,0);
706 Msg = GetClearSig(Email);
708 ErrMsg = "Message is not PGP signed:"
709 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
710 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
711 raise UDFormatError, "No PGP signature";
713 # Check the signature
714 ErrMsg = "Unable to check the signature or the signature was invalid:";
715 Res = GPGCheckSig(Msg[0]);
718 raise UDFormatError, Res[0];
721 raise UDFormatError, "Null signature text";
723 # Extract the plain message text in the event of mime encoding
725 ErrMsg = "Problem stripping MIME headers from the decoded message"
728 Index = Res[3].index("\n\n") + 2;
730 Index = Res[3].index("\n\r\n") + 3;
731 PlainText = Res[3][Index:];
735 # Connect to the ldap server
736 ErrType = EX_TEMPFAIL;
737 ErrMsg = "An error occured while performing the LDAP lookup";
740 l.simple_bind_s("","");
742 # Search for the matching key fingerprint
743 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + Res[2][1]);
745 ErrType = EX_PERMFAIL;
747 raise UDFormatError, "Key not found"
749 raise UDFormatError, "Oddly your key fingerprint is assigned to more than one account.."
752 # Check the signature against the replay cache
753 RC = ReplayCache(ReplayCacheFile);
755 ErrMsg = "The replay cache rejected your message. Check your clock!";
756 Rply = RC.Check(Res[1]);
759 raise UDNotAllowedError, Rply;
763 # Determine the sender address
764 ErrMsg = "A problem occured while trying to formulate the reply";
765 Sender = Email.getheader("Reply-To");
767 Sender = Email.getheader("From");
769 raise UDFormatError, "Unable to determine the sender's address";
772 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
773 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date);
776 if sys.argv[1] == "ping":
777 Reply = HandlePing(Reply,Attrs[0],Res[2]);
778 elif sys.argv[1] == "chpass":
779 if PlainText.strip().find("Please change my Debian password") != 0:
780 raise UDFormatError,"Please send a signed message where the first line of text is the string 'Please change my Debian password'";
781 Reply = HandleChPass(Reply,Attrs[0],Res[2]);
782 elif sys.argv[1] == "change":
783 Reply = HandleChange(Reply,Attrs[0],Res[2]);
786 raise UDFormatError, "Incorrect Invokation";
788 # Send the message through sendmail
789 ErrMsg = "A problem occured while trying to send the reply";
790 Child = os.popen("/usr/sbin/sendmail -t","w");
791 # Child = os.popen("cat","w");
793 if Child.close() != None:
794 raise UDExecuteError, "Sendmail gave a non-zero return code";
798 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
799 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date);
803 Subst["__ERROR__"] = ErrMsg;
804 Subst["__ADMIN__"] = ReplyTo;
806 Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
807 List = traceback.extract_tb(sys.exc_traceback);
809 Trace = Trace + "Python Stack Trace:\n";
811 Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]);
813 Subst["__TRACE__"] = Trace;
815 # Try to send the bounce
817 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read());
819 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''","w");
820 Child.write(ErrReplyHead);
821 Child.write(ErrReply);
822 if Child.close() != None:
823 raise UDExecuteError, "Sendmail gave a non-zero return code";
825 sys.exit(EX_TEMPFAIL);
827 if ErrType != EX_PERMFAIL:
833 # vim:set shiftwidth=3: