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}) (.+)$')
34 ArbChanges = {"c": "..",
36 "facsimileTelephoneNumber": ".*",
37 "telephoneNumber": ".*",
38 "postalAddress": ".*",
41 "emailForward": "^([^<>@]+@.+)?$",
42 "jabberJID": "^([^<>@]+@.+)?$",
47 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
48 "mailDisableMessage": ".*",
49 "mailGreylisting": "^(TRUE|FALSE)$",
50 "mailCallout": "^(TRUE|FALSE)$",
53 DelItems = {"c": None,
55 "facsimileTelephoneNumber": None,
56 "telephoneNumber": None,
57 "postalAddress": None,
69 "sshRSAAuthKey": None,
70 "sshDSAAuthKey": None,
72 "mailGreylisting": None,
76 "mailWhitelist": None,
77 "mailDisableMessage": None,
80 # Decode a GPS location from some common forms
81 def LocDecode(Str,Dir):
82 # Check for Decimal degrees, DGM, or DGMS
83 if re.match("^[+-]?[\d.]+$",Str) != None:
86 Deg = '0'; Min = None; Sec = None; Dr = Dir[0];
88 # Check for DDDxMM.MMMM where x = [nsew]
89 Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str);
92 Deg = G[0]; Min = G[2]; Dr = G[1];
95 Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str);
98 Deg = G[0]; Dr = G[1];
100 # Check for DD:MM.MM x
101 Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str);
104 Deg = G[0]; Min = G[1]; Dr = G[2];
106 # Check for DD:MM:SS.SS x
107 Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str);
110 Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3];
114 raise "Failed","Bad degrees";
115 if Min != None and float(Min) > 60:
116 raise "Failed","Bad minutes";
117 if Sec != None and float(Sec) > 60:
118 raise "Failed","Bad seconds";
120 # Pad on an extra leading 0 to disambiguate small numbers
121 if len(Deg) <= 1 or Deg[1] == '.':
123 if Min != None and (len(Min) <= 1 or Min[1] == '.'):
125 if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'):
128 # Construct a DGM/DGMS type value from the components.
139 # Handle changing a set of arbitary fields
141 def DoArbChange(Str,Attrs):
142 Match = re.match("^([^ :]+): (.*)$",Str);
147 attrName = G[0].lower();
148 for i in ArbChanges.keys():
149 if i.lower() == attrName:
152 if ArbChanges.has_key(attrName) == 0:
155 if re.match(ArbChanges[attrName],G[1]) == None:
156 raise Error, "Item does not match the required format"+ArbChanges[attrName];
158 # if attrName == 'birthDate':
159 # (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",G[1]) {
160 # $bd_yr = $1; $bd_mo = $2; $bd_day = $3;
161 # if ($bd_mo > 0 and $bd_mo <= 12 and $bd_day > 0) {
163 # if ($bd_day == 29 and ($bd_yr == 0 or ($bd_yr % 4 == 0 && ($bd_yr % 100 != 0 || $bd_yr % 400 == 0)))) {
165 # } elsif ($bd_day <= 28) {
168 # } elsif ($bd_mo == 4 or $bd_mo == 6 or $bd_mo == 9 or $bd_mo == 11) {
169 # if ($bd_day <= 30) {
173 # if ($bd_day <= 31) {
178 # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) {
181 Attrs.append((ldap.MOD_REPLACE,attrName,G[1]));
182 return "Changed entry %s to %s"%(attrName,G[1]);
184 # Handle changing a set of arbitary fields
186 def DoDel(Str,Attrs):
187 Match = re.match("^del (.*)$",Str);
192 attrName = G[0].lower();
193 for i in DelItems.keys():
194 if i.lower() == attrName:
197 if DelItems.has_key(attrName) == 0:
198 return "Cannot erase entry %s"%(attrName);
200 Attrs.append((ldap.MOD_DELETE,attrName,None));
201 return "Removed entry %s"%(attrName);
203 # Handle a position change message, the line format is:
204 # Lat: -12412.23 Long: +12341.2342
205 def DoPosition(Str,Attrs):
206 Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
212 sLat = LocDecode(G[0],"ns");
213 sLong = LocDecode(G[1],"ew");
214 Lat = DecDegree(sLat,1);
215 Long = DecDegree(sLong,1);
217 raise Error, "Positions were found, but they are not correctly formed";
219 Attrs.append((ldap.MOD_REPLACE,"latitude",sLat));
220 Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
221 return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long);
223 # Load bad ssh fingerprints
225 f = open(SSHFingerprintFile, "r")
227 FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$')
228 for line in f.readlines():
229 Match = FingerprintLine.match(line)
230 if Match is not None:
235 # Handle an SSH authentication key, the line format is:
236 # [options] 1024 35 13188913666680[..] [comment]
237 def DoSSH(Str, Attrs, badkeys, uid):
238 Match = SSH2AuthSplit.match(Str);
242 Match = re.compile('^1024 (\d+) ').match(Str)
243 if Match is not None:
244 return "SSH1 keys not supported anymore"
247 (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
249 f.write("%s\n" % (Str))
251 cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path)
252 (result, output) = commands.getstatusoutput(cmd)
255 raise Error, "ssh-keygen -l invocation failed!\n%s\n" % (output)
259 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()))
260 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],os.environ['SENDER'],ReplyTo,Date)
262 Subst["__ADMIN__"] = ReplyTo
263 Subst["__USER__"] = uid
265 Match = SSHFingerprint.match(output)
271 Subst["__ERROR__"] = "SSH keysize %s is below limit 1024" % (g[0])
272 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
274 Child = os.popen("/usr/sbin/sendmail -t","w")
275 Child.write(ErrReplyHead)
276 Child.write(ErrReply)
277 if Child.close() != None:
278 raise Error, "Sendmail gave a non-zero return code"
280 sys.exit(EX_TEMPFAIL)
282 # And now break and stop processing input, which sends a reply to the user.
283 raise Error, "SSH keys must have at least 1024 bits, processing halted, NOTHING MODIFIED AT ALL"
284 elif g[1] in badkeys:
287 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
288 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
290 Child = os.popen("/usr/sbin/sendmail -t","w")
291 Child.write(ErrReplyHead)
292 Child.write(ErrReply)
293 if Child.close() != None:
294 raise Error, "Sendmail gave a non-zero return code"
296 sys.exit(EX_TEMPFAIL)
298 # And now break and stop processing input, which sends a reply to the user.
299 raise Error, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL"
301 if (typekey == "dss"):
302 return "DSA keys not accepted anymore"
306 Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str));
307 return "SSH Key added "+FormatSSHAuth(Str);
309 Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str));
311 return "SSH Keys replaced with "+FormatSSHAuth(Str);
313 # Handle changing a dns entry
314 # host IN A 12.12.12.12
315 # host IN AAAA 1234::5678
316 # host IN CNAME foo.bar. <- Trailing dot is required
317 # host IN MX foo.bar. <- Trailing dot is required
318 def DoDNS(Str,Attrs,DnRecord):
319 cnamerecord = re.match("^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$",Str,re.IGNORECASE)
320 arecord = re.match('^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$',Str,re.IGNORECASE)
321 mxrecord = re.match("^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$",Str,re.IGNORECASE)
322 #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE)
323 aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE)
325 if cnamerecord == None and\
327 mxrecord == None and\
331 # Check if the name is already taken
332 G = re.match('^([-\w+]+)\s',Str)
334 raise Error, "Hostname not found although we already passed record syntax checks"
335 hostname = G.group(1)
337 # Check for collisions
339 # [JT 20070409 - search for both tab and space suffixed hostnames
340 # since we accept either. It'd probably be better to parse the
341 # incoming string in order to construct what we feed LDAP rather
342 # than just passing it through as is.]
343 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
344 Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,filter,["uid"]);
346 if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"):
347 return "DNS entry is already owned by " + GetAttr(x,"uid")
353 if DNS.has_key(hostname):
354 return "CNAME and other RR types not allowed: "+Str
358 if DNS.has_key(hostname) and DNS[hostname] == 2:
359 return "CNAME and other RR types not allowed: "+Str
363 if cnamerecord != None:
364 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
365 elif arecord != None:
366 ipaddress = arecord.group(1)
367 for quad in ipaddress.split('.'):
368 if not (int(quad) >=0 and int(quad) <= 255):
369 return "Invalid quad %s in IP address %s in line %s" %(quad, ipaddress, Str)
370 sanitized = "%s IN A %s"% (hostname, ipaddress)
371 elif mxrecord != None:
372 priority = mxrecord.group(1)
373 mx = mxrecord.group(2)
374 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
375 elif aaaarecord != None:
376 ipv6address = aaaarecord.group(1)
377 parts = ipv6address.split(':')
379 return "Invalid IPv6 address (%s): too many parts"%(ipv6address)
381 return "Invalid IPv6 address (%s): too few parts"%(ipv6address)
386 seenEmptypart = False
389 return "Invalid IPv6 address (%s): part %s is longer than 4 characters"%(ipv6address, p)
392 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed"%(ipv6address)
394 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
396 raise Error, "None of the types I recognize was it. I shouldn't be here. confused."
399 Attrs.append((ldap.MOD_ADD,"dnsZoneEntry",sanitized));
400 return "DNS Entry added "+sanitized;
402 Attrs.append((ldap.MOD_REPLACE,"dnsZoneEntry",sanitized));
404 return "DNS Entry replaced with "+sanitized;
406 # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist)
407 def DoRBL(Str,Attrs):
408 Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower())
412 if Match.group(1) == "rbl":
414 if Match.group(1) == "rhsbl":
416 if Match.group(1) == "whitelist":
417 Key = "mailWhitelist"
418 Host = Match.group(2)
421 if SeenList.has_key(Key):
422 Attrs.append((ldap.MOD_ADD,Key,Host))
423 return "%s added %s" % (Key,Host)
425 Attrs.append((ldap.MOD_REPLACE,Key,Host))
427 return "%s replaced with %s" % (Key,Host)
429 # Handle an [almost] arbitary change
430 def HandleChange(Reply,DnRecord,Key):
432 Lines = re.split("\n *\r?",PlainText);
442 # Try to process a command line
443 Result = Result + "> "+Line+"\n";
449 badkeys = LoadBadSSH()
450 Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \
451 DoArbChange(Line,Attrs) or DoSSH(Line,Attrs,badkeys,GetAttr(DnRecord,"uid")) or \
452 DoDel(Line,Attrs) or DoRBL(Line,Attrs)
455 Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
457 # Fail, if someone tries to send someone elses signed email to the
458 # daemon then we want to abort ASAP.
460 Result = Result + "Command is not understood. Halted\n";
462 Result = Result + Res + "\n";
464 # Connect to the ldap server
465 l = ldap.open(LDAPServer);
466 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
467 AccessPass = F.readline().strip().split(" ")
471 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
472 oldAttrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
473 if ((GetAttr(oldAttrs[0],"userPassword").find("*LK*") != -1)
474 or GetAttr(oldAttrs[0],"userPassword").startswith("!")):
475 raise Error, "This account is locked";
476 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
477 l.modify_s(Dn,Attrs);
481 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
483 raise Error, "User not found"
484 Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]);
487 Subst["__FROM__"] = ChangeFrom;
488 Subst["__EMAIL__"] = EmailAddress(DnRecord);
489 Subst["__ADMIN__"] = ReplyTo;
490 Subst["__RESULT__"] = Result;
491 Subst["__ATTR__"] = Attribs;
493 return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read());
495 # Handle ping handles an email sent to the 'ping' address (ie this program
496 # called with a ping argument) It replies with a dump of the public records.
497 def HandlePing(Reply,DnRecord,Key):
499 Subst["__FROM__"] = PingFrom;
500 Subst["__EMAIL__"] = EmailAddress(DnRecord);
501 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord);
502 Subst["__ADMIN__"] = ReplyTo;
504 return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read());
506 # Handle a change password email sent to the change password address
507 # (this program called with the chpass argument)
508 def HandleChPass(Reply,DnRecord,Key):
509 # Generate a random password
510 Password = GenPass();
511 Pass = HashPass(Password);
513 # Use GPG to encrypt it
514 Message = GPGEncrypt("Your new password is '" + Password + "'\n",\
519 raise Error, "Unable to generate the encrypted reply, gpg failed.";
522 Type = "Your message was encrypted using PGP 2.x\ncompatibility mode.";
524 Type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
525 "mode, without IDEA. This message cannot be decoded using PGP 2.x";
528 Subst["__FROM__"] = ChPassFrom;
529 Subst["__EMAIL__"] = EmailAddress(DnRecord);
530 Subst["__CRYPTTYPE__"] = Type;
531 Subst["__PASSWORD__"] = Message;
532 Subst["__ADMIN__"] = ReplyTo;
533 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
535 # Connect to the ldap server
536 l = ldap.open(LDAPServer);
537 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
538 AccessPass = F.readline().strip().split(" ")
540 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
542 # Check for a locked account
543 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
544 if (GetAttr(Attrs[0],"userPassword").find("*LK*") != -1) \
545 or GetAttr(Attrs[0],"userPassword").startswith("!"):
546 raise Error, "This account is locked";
548 # Modify the password
549 Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass)];
550 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
555 # Start of main program
557 # Drop messages from a mailer daemon.
558 if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0:
561 ErrMsg = "Indeterminate Error";
562 ErrType = EX_TEMPFAIL;
564 # Startup the replay cache
565 ErrType = EX_TEMPFAIL;
566 ErrMsg = "Failed to initialize the replay cache:";
567 RC = ReplayCache(ReplayCacheFile);
571 ErrType = EX_PERMFAIL;
572 ErrMsg = "Failed to understand the email or find a signature:";
573 Email = mimetools.Message(sys.stdin,0);
574 Msg = GetClearSig(Email);
576 ErrMsg = "Message is not PGP signed:"
577 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
578 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
579 raise Error, "No PGP signature";
581 # Check the signature
582 ErrMsg = "Unable to check the signature or the signature was invalid:";
583 Res = GPGCheckSig(Msg[0]);
589 raise Error, "Null signature text";
591 # Extract the plain message text in the event of mime encoding
593 ErrMsg = "Problem stripping MIME headers from the decoded message"
596 Index = Res[3].index("\n\n") + 2;
598 Index = Res[3].index("\n\r\n") + 3;
599 PlainText = Res[3][Index:];
603 # Check the signature against the replay cache
604 ErrMsg = "The replay cache rejected your message. Check your clock!";
605 Rply = RC.Check(Res[1]);
609 # Connect to the ldap server
610 ErrType = EX_TEMPFAIL;
611 ErrMsg = "An error occured while performing the LDAP lookup";
613 l = ldap.open(LDAPServer);
614 l.simple_bind_s("","");
616 # Search for the matching key fingerprint
617 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + Res[2][1]);
619 ErrType = EX_PERMFAIL;
621 raise Error, "Key not found"
623 raise Error, "Oddly your key fingerprint is assigned to more than one account.."
627 # Determine the sender address
628 ErrMsg = "A problem occured while trying to formulate the reply";
629 Sender = Email.getheader("Reply-To");
631 Sender = Email.getheader("From");
633 raise Error, "Unable to determine the sender's address";
636 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
637 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date);
640 if sys.argv[1] == "ping":
641 Reply = HandlePing(Reply,Attrs[0],Res[2]);
642 elif sys.argv[1] == "chpass":
643 if PlainText.strip().find("Please change my Debian password") != 0:
644 raise Error,"Please send a signed message where the first line of text is the string 'Please change my Debian password'";
645 Reply = HandleChPass(Reply,Attrs[0],Res[2]);
646 elif sys.argv[1] == "change":
647 Reply = HandleChange(Reply,Attrs[0],Res[2]);
650 raise Error, "Incorrect Invokation";
652 # Send the message through sendmail
653 ErrMsg = "A problem occured while trying to send the reply";
654 Child = os.popen("/usr/sbin/sendmail -t","w");
655 # Child = os.popen("cat","w");
657 if Child.close() != None:
658 raise Error, "Sendmail gave a non-zero return code";
662 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
663 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date);
667 Subst["__ERROR__"] = ErrMsg;
668 Subst["__ADMIN__"] = ReplyTo;
670 Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
671 List = traceback.extract_tb(sys.exc_traceback);
673 Trace = Trace + "Python Stack Trace:\n";
675 Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]);
677 Subst["__TRACE__"] = Trace;
679 # Try to send the bounce
681 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read());
683 Child = os.popen("/usr/sbin/sendmail -t","w");
684 Child.write(ErrReplyHead);
685 Child.write(ErrReply);
686 if Child.close() != None:
687 raise Error, "Sendmail gave a non-zero return code";
689 sys.exit(EX_TEMPFAIL);
691 if ErrType != EX_PERMFAIL: