4 # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008
5 # Copyright (c) 2008 Peter Palfrader <peter@palfrader.org>
6 # Copyright (c) 2008 Joerg Jaspert <joerg@debian.org>
8 import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands
10 from userdir_gpg import *
11 from userdir_ldap import *
13 # Error codes from /usr/include/sysexits.h
14 ReplyTo = ConfModule.replyto;
15 PingFrom = ConfModule.pingfrom;
16 ChPassFrom = ConfModule.chpassfrom;
17 ChangeFrom = ConfModule.changefrom;
18 ReplayCacheFile = ConfModule.replaycachefile;
19 SSHFingerprintFile = ConfModule.fingerprintfile
22 EX_PERMFAIL = 65; # EX_DATAERR
23 Error = 'Message Error';
32 SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$')
33 SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+')
35 GenderTable = {"male": 1,
43 ArbChanges = {"c": "..",
45 "facsimileTelephoneNumber": ".*",
46 "telephoneNumber": ".*",
47 "postalAddress": ".*",
50 "emailForward": "^([^<>@]+@.+)?$",
51 "jabberJID": "^([^<>@]+@.+)?$",
56 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
57 "mailDisableMessage": ".*",
58 "mailGreylisting": "^(TRUE|FALSE)$",
59 "mailCallout": "^(TRUE|FALSE)$",
61 "gender": "^(1|2|9|male|female|unspecified)$",
64 DelItems = {"c": None,
66 "facsimileTelephoneNumber": None,
67 "telephoneNumber": None,
68 "postalAddress": None,
80 "sshRSAAuthKey": None,
81 "sshDSAAuthKey": None,
83 "mailGreylisting": None,
87 "mailWhitelist": None,
88 "mailDisableMessage": None,
92 # Decode a GPS location from some common forms
93 def LocDecode(Str,Dir):
94 # Check for Decimal degrees, DGM, or DGMS
95 if re.match("^[+-]?[\d.]+$",Str) != None:
98 Deg = '0'; Min = None; Sec = None; Dr = Dir[0];
100 # Check for DDDxMM.MMMM where x = [nsew]
101 Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str);
104 Deg = G[0]; Min = G[2]; Dr = G[1];
107 Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str);
110 Deg = G[0]; Dr = G[1];
112 # Check for DD:MM.MM x
113 Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str);
116 Deg = G[0]; Min = G[1]; Dr = G[2];
118 # Check for DD:MM:SS.SS x
119 Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str);
122 Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3];
126 raise "Failed","Bad degrees";
127 if Min != None and float(Min) > 60:
128 raise "Failed","Bad minutes";
129 if Sec != None and float(Sec) > 60:
130 raise "Failed","Bad seconds";
132 # Pad on an extra leading 0 to disambiguate small numbers
133 if len(Deg) <= 1 or Deg[1] == '.':
135 if Min != None and (len(Min) <= 1 or Min[1] == '.'):
137 if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'):
140 # Construct a DGM/DGMS type value from the components.
151 # Handle changing a set of arbitary fields
153 def DoArbChange(Str,Attrs):
154 Match = re.match("^([^ :]+): (.*)$",Str);
159 attrName = G[0].lower();
160 for i in ArbChanges.keys():
161 if i.lower() == attrName:
164 if ArbChanges.has_key(attrName) == 0:
167 if re.match(ArbChanges[attrName],G[1]) == None:
168 raise Error, "Item does not match the required format"+ArbChanges[attrName];
171 if attrName == 'gender':
172 if G[1] not in GenderTable:
173 raise Error, "Gender not found in table"
174 value = GenderTable[G[1]]
176 # if attrName == 'birthDate':
177 # (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",G[1]) {
178 # $bd_yr = $1; $bd_mo = $2; $bd_day = $3;
179 # if ($bd_mo > 0 and $bd_mo <= 12 and $bd_day > 0) {
181 # if ($bd_day == 29 and ($bd_yr == 0 or ($bd_yr % 4 == 0 && ($bd_yr % 100 != 0 || $bd_yr % 400 == 0)))) {
183 # } elsif ($bd_day <= 28) {
186 # } elsif ($bd_mo == 4 or $bd_mo == 6 or $bd_mo == 9 or $bd_mo == 11) {
187 # if ($bd_day <= 30) {
191 # if ($bd_day <= 31) {
196 # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) {
199 Attrs.append((ldap.MOD_REPLACE,attrName,value));
200 return "Changed entry %s to %s"%(attrName,value);
202 # Handle changing a set of arbitary fields
204 def DoDel(Str,Attrs):
205 Match = re.match("^del (.*)$",Str);
210 attrName = G[0].lower();
211 for i in DelItems.keys():
212 if i.lower() == attrName:
215 if DelItems.has_key(attrName) == 0:
216 return "Cannot erase entry %s"%(attrName);
218 Attrs.append((ldap.MOD_DELETE,attrName,None));
219 return "Removed entry %s"%(attrName);
221 # Handle a position change message, the line format is:
222 # Lat: -12412.23 Long: +12341.2342
223 def DoPosition(Str,Attrs):
224 Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
230 sLat = LocDecode(G[0],"ns");
231 sLong = LocDecode(G[1],"ew");
232 Lat = DecDegree(sLat,1);
233 Long = DecDegree(sLong,1);
235 raise Error, "Positions were found, but they are not correctly formed";
237 Attrs.append((ldap.MOD_REPLACE,"latitude",sLat));
238 Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
239 return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long);
241 # Load bad ssh fingerprints
243 f = open(SSHFingerprintFile, "r")
245 FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$')
246 for line in f.readlines():
247 Match = FingerprintLine.match(line)
248 if Match is not None:
253 # Handle an SSH authentication key, the line format is:
254 # [options] 1024 35 13188913666680[..] [comment]
255 def DoSSH(Str, Attrs, badkeys, uid):
256 Match = SSH2AuthSplit.match(Str);
262 Match = SSHRSA1Match.match(Str)
263 if Match is not None:
264 return "RSA1 keys not supported anymore"
267 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
269 f.write("%s\n" % (Str))
271 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
272 (result, output) = commands.getstatusoutput(cmd)
275 raise Error, "ssh-keygen -l invocation failed!\n%s\n" % (output)
279 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()))
280 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],os.environ['SENDER'],ReplyTo,Date)
282 Subst["__ADMIN__"] = ReplyTo
283 Subst["__USER__"] = uid
285 Match = SSHFingerprint.match(output)
291 Subst["__ERROR__"] = "SSH keysize %s is below limit 1024" % (g[0])
292 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
294 Child = os.popen("/usr/sbin/sendmail -t","w")
295 Child.write(ErrReplyHead)
296 Child.write(ErrReply)
297 if Child.close() != None:
298 raise Error, "Sendmail gave a non-zero return code"
300 sys.exit(EX_TEMPFAIL)
302 # And now break and stop processing input, which sends a reply to the user.
303 raise Error, "SSH keys must have at least 1024 bits, processing halted, NOTHING MODIFIED AT ALL"
304 elif g[1] in badkeys:
307 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
308 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
310 Child = os.popen("/usr/sbin/sendmail -t","w")
311 Child.write(ErrReplyHead)
312 Child.write(ErrReply)
313 if Child.close() != None:
314 raise Error, "Sendmail gave a non-zero return code"
316 sys.exit(EX_TEMPFAIL)
318 # And now break and stop processing input, which sends a reply to the user.
319 raise Error, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL"
321 if (typekey == "dss"):
322 return "DSA keys not accepted anymore"
326 Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str));
327 return "SSH Key added "+FormatSSHAuth(Str);
329 Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str));
331 return "SSH Keys replaced with "+FormatSSHAuth(Str);
333 # Handle changing a dns entry
334 # host IN A 12.12.12.12
335 # host IN AAAA 1234::5678
336 # host IN CNAME foo.bar. <- Trailing dot is required
337 # host IN MX foo.bar. <- Trailing dot is required
338 def DoDNS(Str,Attrs,DnRecord):
339 cnamerecord = re.match("^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$",Str,re.IGNORECASE)
340 arecord = re.match('^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$',Str,re.IGNORECASE)
341 mxrecord = re.match("^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$",Str,re.IGNORECASE)
342 #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE)
343 aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE)
345 if cnamerecord == None and\
347 mxrecord == None and\
351 # Check if the name is already taken
352 G = re.match('^([-\w+]+)\s',Str)
354 raise Error, "Hostname not found although we already passed record syntax checks"
355 hostname = G.group(1)
357 # Check for collisions
359 # [JT 20070409 - search for both tab and space suffixed hostnames
360 # since we accept either. It'd probably be better to parse the
361 # incoming string in order to construct what we feed LDAP rather
362 # than just passing it through as is.]
363 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
364 Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,filter,["uid"]);
366 if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"):
367 return "DNS entry is already owned by " + GetAttr(x,"uid")
373 if DNS.has_key(hostname):
374 return "CNAME and other RR types not allowed: "+Str
378 if DNS.has_key(hostname) and DNS[hostname] == 2:
379 return "CNAME and other RR types not allowed: "+Str
383 if cnamerecord != None:
384 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
385 elif arecord != None:
386 ipaddress = arecord.group(1)
387 for quad in ipaddress.split('.'):
388 if not (int(quad) >=0 and int(quad) <= 255):
389 return "Invalid quad %s in IP address %s in line %s" %(quad, ipaddress, Str)
390 sanitized = "%s IN A %s"% (hostname, ipaddress)
391 elif mxrecord != None:
392 priority = mxrecord.group(1)
393 mx = mxrecord.group(2)
394 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
395 elif aaaarecord != None:
396 ipv6address = aaaarecord.group(1)
397 parts = ipv6address.split(':')
399 return "Invalid IPv6 address (%s): too many parts"%(ipv6address)
401 return "Invalid IPv6 address (%s): too few parts"%(ipv6address)
406 seenEmptypart = False
409 return "Invalid IPv6 address (%s): part %s is longer than 4 characters"%(ipv6address, p)
412 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed"%(ipv6address)
414 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
416 raise Error, "None of the types I recognize was it. I shouldn't be here. confused."
419 Attrs.append((ldap.MOD_ADD,"dnsZoneEntry",sanitized));
420 return "DNS Entry added "+sanitized;
422 Attrs.append((ldap.MOD_REPLACE,"dnsZoneEntry",sanitized));
424 return "DNS Entry replaced with "+sanitized;
426 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
427 def DoRBL(Str,Attrs):
428 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
432 if Match.group(1) == "rbl":
434 if Match.group(1) == "rhsbl":
436 if Match.group(1) == "whitelist":
437 Key = "mailWhitelist"
438 Host = Match.group(2)
441 if SeenList.has_key(Key):
442 Attrs.append((ldap.MOD_ADD,Key,Host))
443 return "%s added %s" % (Key,Host)
445 Attrs.append((ldap.MOD_REPLACE,Key,Host))
447 return "%s replaced with %s" % (Key,Host)
449 # Handle an [almost] arbitary change
450 def HandleChange(Reply,DnRecord,Key):
452 Lines = re.split("\n *\r?",PlainText);
462 # Try to process a command line
463 Result = Result + "> "+Line+"\n";
469 badkeys = LoadBadSSH()
470 Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \
471 DoArbChange(Line,Attrs) or DoSSH(Line,Attrs,badkeys,GetAttr(DnRecord,"uid")) or \
472 DoDel(Line,Attrs) or DoRBL(Line,Attrs)
475 Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
477 # Fail, if someone tries to send someone elses signed email to the
478 # daemon then we want to abort ASAP.
480 Result = Result + "Command is not understood. Halted\n";
482 Result = Result + Res + "\n";
484 # Connect to the ldap server
486 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
487 AccessPass = F.readline().strip().split(" ")
491 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
492 oldAttrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
493 if ((GetAttr(oldAttrs[0],"userPassword").find("*LK*") != -1)
494 or GetAttr(oldAttrs[0],"userPassword").startswith("!")):
495 raise Error, "This account is locked";
496 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
497 l.modify_s(Dn,Attrs);
501 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
503 raise Error, "User not found"
504 Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]);
507 Subst["__FROM__"] = ChangeFrom;
508 Subst["__EMAIL__"] = EmailAddress(DnRecord);
509 Subst["__ADMIN__"] = ReplyTo;
510 Subst["__RESULT__"] = Result;
511 Subst["__ATTR__"] = Attribs;
513 return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read());
515 # Handle ping handles an email sent to the 'ping' address (ie this program
516 # called with a ping argument) It replies with a dump of the public records.
517 def HandlePing(Reply,DnRecord,Key):
519 Subst["__FROM__"] = PingFrom;
520 Subst["__EMAIL__"] = EmailAddress(DnRecord);
521 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord);
522 Subst["__ADMIN__"] = ReplyTo;
524 return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read());
526 # Handle a change password email sent to the change password address
527 # (this program called with the chpass argument)
528 def HandleChPass(Reply,DnRecord,Key):
529 # Generate a random password
530 Password = GenPass();
531 Pass = HashPass(Password);
533 # Use GPG to encrypt it
534 Message = GPGEncrypt("Your new password is '" + Password + "'\n",\
539 raise Error, "Unable to generate the encrypted reply, gpg failed.";
542 Type = "Your message was encrypted using PGP 2.x\ncompatibility mode.";
544 Type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
545 "mode, without IDEA. This message cannot be decoded using PGP 2.x";
548 Subst["__FROM__"] = ChPassFrom;
549 Subst["__EMAIL__"] = EmailAddress(DnRecord);
550 Subst["__CRYPTTYPE__"] = Type;
551 Subst["__PASSWORD__"] = Message;
552 Subst["__ADMIN__"] = ReplyTo;
553 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
555 # Connect to the ldap server
557 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
558 AccessPass = F.readline().strip().split(" ")
560 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
562 # Check for a locked account
563 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
564 if (GetAttr(Attrs[0],"userPassword").find("*LK*") != -1) \
565 or GetAttr(Attrs[0],"userPassword").startswith("!"):
566 raise Error, "This account is locked";
568 # Modify the password
569 Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass),
570 (ldap.MOD_REPLACE,"shadowLastChange",str(int(time.time()/24/60/60)))];
571 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
576 # Start of main program
578 # Drop messages from a mailer daemon.
579 if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0:
582 ErrMsg = "Indeterminate Error";
583 ErrType = EX_TEMPFAIL;
585 # Startup the replay cache
586 ErrType = EX_TEMPFAIL;
587 ErrMsg = "Failed to initialize the replay cache:";
588 RC = ReplayCache(ReplayCacheFile);
592 ErrType = EX_PERMFAIL;
593 ErrMsg = "Failed to understand the email or find a signature:";
594 Email = mimetools.Message(sys.stdin,0);
595 Msg = GetClearSig(Email);
597 ErrMsg = "Message is not PGP signed:"
598 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
599 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
600 raise Error, "No PGP signature";
602 # Check the signature
603 ErrMsg = "Unable to check the signature or the signature was invalid:";
604 Res = GPGCheckSig(Msg[0]);
610 raise Error, "Null signature text";
612 # Extract the plain message text in the event of mime encoding
614 ErrMsg = "Problem stripping MIME headers from the decoded message"
617 Index = Res[3].index("\n\n") + 2;
619 Index = Res[3].index("\n\r\n") + 3;
620 PlainText = Res[3][Index:];
624 # Check the signature against the replay cache
625 ErrMsg = "The replay cache rejected your message. Check your clock!";
626 Rply = RC.Check(Res[1]);
630 # Connect to the ldap server
631 ErrType = EX_TEMPFAIL;
632 ErrMsg = "An error occured while performing the LDAP lookup";
635 l.simple_bind_s("","");
637 # Search for the matching key fingerprint
638 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + Res[2][1]);
640 ErrType = EX_PERMFAIL;
642 raise Error, "Key not found"
644 raise Error, "Oddly your key fingerprint is assigned to more than one account.."
648 # Determine the sender address
649 ErrMsg = "A problem occured while trying to formulate the reply";
650 Sender = Email.getheader("Reply-To");
652 Sender = Email.getheader("From");
654 raise Error, "Unable to determine the sender's address";
657 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
658 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date);
661 if sys.argv[1] == "ping":
662 Reply = HandlePing(Reply,Attrs[0],Res[2]);
663 elif sys.argv[1] == "chpass":
664 if PlainText.strip().find("Please change my Debian password") != 0:
665 raise Error,"Please send a signed message where the first line of text is the string 'Please change my Debian password'";
666 Reply = HandleChPass(Reply,Attrs[0],Res[2]);
667 elif sys.argv[1] == "change":
668 Reply = HandleChange(Reply,Attrs[0],Res[2]);
671 raise Error, "Incorrect Invokation";
673 # Send the message through sendmail
674 ErrMsg = "A problem occured while trying to send the reply";
675 Child = os.popen("/usr/sbin/sendmail -t","w");
676 # Child = os.popen("cat","w");
678 if Child.close() != None:
679 raise Error, "Sendmail gave a non-zero return code";
683 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
684 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date);
688 Subst["__ERROR__"] = ErrMsg;
689 Subst["__ADMIN__"] = ReplyTo;
691 Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
692 List = traceback.extract_tb(sys.exc_traceback);
694 Trace = Trace + "Python Stack Trace:\n";
696 Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]);
698 Subst["__TRACE__"] = Trace;
700 # Try to send the bounce
702 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read());
704 Child = os.popen("/usr/sbin/sendmail -t","w");
705 Child.write(ErrReplyHead);
706 Child.write(ErrReply);
707 if Child.close() != None:
708 raise Error, "Sendmail gave a non-zero return code";
710 sys.exit(EX_TEMPFAIL);
712 if ErrType != EX_PERMFAIL: