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>
10 import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands
13 import email, email.parser
16 from userdir_gpg import *
17 from userdir_ldap import *
18 from userdir_exceptions import *
20 # Error codes from /usr/include/sysexits.h
21 ReplyTo = ConfModule.replyto;
22 PingFrom = ConfModule.pingfrom;
23 ChPassFrom = ConfModule.chpassfrom;
24 ChangeFrom = ConfModule.changefrom;
25 ReplayCacheFile = ConfModule.replaycachefile;
26 SSHFingerprintFile = ConfModule.fingerprintfile
28 UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'
31 EX_PERMFAIL = 65; # EX_DATAERR
32 Error = 'Message Error';
40 ValidHostNames = [] # will be initialized in later
42 SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$')
43 SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+')
45 ArbChanges = {"c": "..",
47 "facsimileTelephoneNumber": ".*",
48 "telephoneNumber": ".*",
49 "postalAddress": ".*",
53 "emailForward": "^([^<>@]+@.+)?$",
54 "jabberJID": "^([^<>@]+@.+)?$",
59 "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$",
60 "mailDisableMessage": ".*",
61 "mailGreylisting": "^(TRUE|FALSE)$",
62 "mailCallout": "^(TRUE|FALSE)$",
63 "mailDefaultOptions": "^(TRUE|FALSE)$",
65 "mailContentInspectionAction": "^(reject|blackhole|markup)$",
68 DelItems = {"c": None,
70 "facsimileTelephoneNumber": None,
71 "telephoneNumber": None,
72 "postalAddress": None,
85 "sshRSAAuthKey": None,
87 "mailGreylisting": None,
91 "mailWhitelist": None,
92 "mailDisableMessage": None,
93 "mailDefaultOptions": None,
95 "mailContentInspectionAction": None,
99 # Decode a GPS location from some common forms
100 def LocDecode(Str,Dir):
101 # Check for Decimal degrees, DGM, or DGMS
102 if re.match("^[+-]?[\d.]+$",Str) != None:
105 Deg = '0'; Min = None; Sec = None; Dr = Dir[0];
107 # Check for DDDxMM.MMMM where x = [nsew]
108 Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str);
111 Deg = G[0]; Min = G[2]; Dr = G[1];
114 Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str);
117 Deg = G[0]; Dr = G[1];
119 # Check for DD:MM.MM x
120 Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str);
123 Deg = G[0]; Min = G[1]; Dr = G[2];
125 # Check for DD:MM:SS.SS x
126 Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str);
129 Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3];
133 raise UDFormatError, "Bad degrees";
134 if Min != None and float(Min) > 60:
135 raise UDFormatError, "Bad minutes";
136 if Sec != None and float(Sec) > 60:
137 raise UDFormatError, "Bad seconds";
139 # Pad on an extra leading 0 to disambiguate small numbers
140 if len(Deg) <= 1 or Deg[1] == '.':
142 if Min != None and (len(Min) <= 1 or Min[1] == '.'):
144 if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'):
147 # Construct a DGM/DGMS type value from the components.
158 # Handle changing a set of arbitary fields
160 def DoArbChange(Str,Attrs):
161 Match = re.match("^([^ :]+): (.*)$",Str);
166 attrName = G[0].lower();
167 for i in ArbChanges.keys():
168 if i.lower() == attrName:
171 if ArbChanges.has_key(attrName) == 0:
174 if re.match(ArbChanges[attrName],G[1]) == None:
175 raise UDFormatError, "Item does not match the required format"+ArbChanges[attrName];
179 # if attrName == 'birthDate':
180 # (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",G[1]) {
181 # $bd_yr = $1; $bd_mo = $2; $bd_day = $3;
182 # if ($bd_mo > 0 and $bd_mo <= 12 and $bd_day > 0) {
184 # if ($bd_day == 29 and ($bd_yr == 0 or ($bd_yr % 4 == 0 && ($bd_yr % 100 != 0 || $bd_yr % 400 == 0)))) {
186 # } elsif ($bd_day <= 28) {
189 # } elsif ($bd_mo == 4 or $bd_mo == 6 or $bd_mo == 9 or $bd_mo == 11) {
190 # if ($bd_day <= 30) {
194 # if ($bd_day <= 31) {
199 # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) {
202 Attrs.append((ldap.MOD_REPLACE,attrName,value));
203 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 (.*)$",Str);
213 attrName = G[0].lower();
214 for i in DelItems.keys():
215 if i.lower() == attrName:
218 if DelItems.has_key(attrName) == 0:
219 return "Cannot erase entry %s"%(attrName);
221 Attrs.append((ldap.MOD_DELETE,attrName,None));
222 return "Removed entry %s"%(attrName);
224 # Handle a position change message, the line format is:
225 # Lat: -12412.23 Long: +12341.2342
226 def DoPosition(Str,Attrs):
227 Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower())
233 sLat = LocDecode(G[0],"ns");
234 sLong = LocDecode(G[1],"ew");
235 Lat = DecDegree(sLat,1);
236 Long = DecDegree(sLong,1);
238 raise UDFormatError, "Positions were found, but they are not correctly formed";
240 Attrs.append((ldap.MOD_REPLACE,"latitude",sLat));
241 Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
242 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('^([0-9a-f\:]{47}).*$')
249 for line in f.readlines():
250 Match = FingerprintLine.match(line)
251 if Match is not None:
256 # Handle an SSH authentication key, the line format is:
257 # [options] 1024 35 13188913666680[..] [comment]
258 # maybe it really should be:
259 # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment]
260 machine_regex = re.compile("^[0-9a-zA-Z.-]+$")
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)
305 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()))
306 ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],os.environ['SENDER'],ReplyTo,Date)
308 Subst["__ADMIN__"] = ReplyTo
309 Subst["__USER__"] = uid
311 Match = SSHFingerprint.match(output)
313 return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?"
319 key_size_ok = (int(key_size) >= 2048)
320 elif typekey == "ed25519":
326 return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys."
327 elif fingerprint in badkeys:
330 Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1])
331 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read())
333 Child = os.popen("/usr/sbin/sendmail -t","w")
334 Child.write(ErrReplyHead)
335 Child.write(ErrReply)
336 if Child.close() != None:
337 raise UDExecuteError, "Sendmail gave a non-zero return code"
339 sys.exit(EX_TEMPFAIL)
341 # And now break and stop processing input, which sends a reply to the user.
342 raise UDFormatError, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL"
346 Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str));
347 return "SSH Key added: %s %s [%s]"%(key_size, fingerprint, FormatSSHAuth(Str))
349 Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str));
351 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("^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$",Str,re.IGNORECASE)
360 arecord = re.match('^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$',Str,re.IGNORECASE)
361 mxrecord = re.match("^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$",Str,re.IGNORECASE)
362 txtrecord = re.match("^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
363 #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE)
364 aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE)
366 if cnamerecord is None and\
368 mxrecord is None and\
369 txtrecord is None and\
373 # Check if the name is already taken
374 G = re.match('^([-\w+]+)\s',Str)
376 raise UDFormatError, "Hostname not found although we already passed record syntax checks"
377 hostname = G.group(1)
379 # Check for collisions
381 # [JT 20070409 - search for both tab and space suffixed hostnames
382 # since we accept either. It'd probably be better to parse the
383 # incoming string in order to construct what we feed LDAP rather
384 # than just passing it through as is.]
385 filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname)
386 Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,filter,["uid"]);
388 if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"):
389 return "DNS entry is already owned by " + GetAttr(x,"uid")
395 if DNS.has_key(hostname):
396 return "CNAME and other RR types not allowed: "+Str
400 if DNS.has_key(hostname) and DNS[hostname] == 2:
401 return "CNAME and other RR types not allowed: "+Str
405 if cnamerecord is not None:
406 sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1))
407 elif txtrecord is not None:
408 sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1))
409 elif arecord is not None:
410 ipaddress = arecord.group(1)
411 for quad in ipaddress.split('.'):
412 if not (int(quad) >=0 and int(quad) <= 255):
413 return "Invalid quad %s in IP address %s in line %s" %(quad, ipaddress, Str)
414 sanitized = "%s IN A %s"% (hostname, ipaddress)
415 elif mxrecord is not None:
416 priority = mxrecord.group(1)
417 mx = mxrecord.group(2)
418 sanitized = "%s IN MX %s %s" % (hostname, priority, mx)
419 elif aaaarecord is not None:
420 ipv6address = aaaarecord.group(1)
421 parts = ipv6address.split(':')
423 return "Invalid IPv6 address (%s): too many parts"%(ipv6address)
425 return "Invalid IPv6 address (%s): too few parts"%(ipv6address)
430 seenEmptypart = False
433 return "Invalid IPv6 address (%s): part %s is longer than 4 characters"%(ipv6address, p)
436 return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed"%(ipv6address)
438 sanitized = "%s IN AAAA %s" % (hostname, ipv6address)
440 raise UDFormatError, "None of the types I recognize was it. I shouldn't be here. confused."
443 Attrs.append((ldap.MOD_ADD,"dnsZoneEntry",sanitized));
444 return "DNS Entry added "+sanitized;
446 Attrs.append((ldap.MOD_REPLACE,"dnsZoneEntry",sanitized));
448 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)
465 if SeenList.has_key(Key):
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)
473 # Handle a ConfirmSudoPassword request
474 def DoConfirmSudopassword(Str, SudoPasswd):
475 Match = re.compile('^confirm sudopassword ('+UUID_FORMAT+') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str)
479 uuid = Match.group(1)
480 hosts = Match.group(2)
481 hmac = Match.group(3)
483 SudoPasswd[uuid] = (hosts, hmac)
484 return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid,hosts, hmac)
486 def FinishConfirmSudopassword(l, uid, Attrs, SudoPasswd):
489 if len(SudoPasswd) == 0:
492 res = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+uid, ['sudoPassword']);
494 raise UDFormatError, "Not exactly one hit when searching for user"
495 if res[0][1].has_key('sudoPassword'):
496 inldap = res[0][1]['sudoPassword']
502 Match = re.compile('^('+UUID_FORMAT+') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry)
504 raise UDFormatError, "Could not parse existing sudopasswd entry"
505 uuid = Match.group(1)
506 status = Match.group(2)
507 hosts = Match.group(3)
508 cryptedpass = Match.group(4)
510 if SudoPasswd.has_key(uuid):
511 confirmedHosts = SudoPasswd[uuid][0]
512 confirmedHmac = SudoPasswd[uuid][1]
513 if status.startswith('confirmed:'):
514 if status == 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass):
515 result = result + "Entry %s for sudo password on hosts %s already confirmed.\n"%(uuid, hosts)
517 result = result + "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n"%(uuid, hosts)
518 elif confirmedHosts != hosts:
519 result = result + "Entry %s hostlist mismatch (%s vs. %s).\n"%(uuid, hosts, confirmedHosts)
520 elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac:
521 result = result + "Entry %s for sudo password on hosts %s now confirmed.\n"%(uuid, hosts)
522 status = 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass)
524 result = result + "Entry %s for sudo password on hosts %s HMAC verify failed.\n"%(uuid, hosts)
527 newentry = " ".join([uuid, status, hosts, cryptedpass])
528 if len(newldap) == 0:
529 newldap.append((ldap.MOD_REPLACE,"sudoPassword",newentry))
531 newldap.append((ldap.MOD_ADD,"sudoPassword",newentry))
533 for entry in SudoPasswd:
534 result = result + "Entry %s that you confirm is not listed in ldap."%(entry)
536 for entry in newldap:
541 def connect_to_ldap_and_check_if_locked(DnRecord):
542 # Connect to the ldap server
544 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
545 AccessPass = F.readline().strip().split(" ")
547 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
549 # Check for a locked account
550 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
551 if (GetAttr(Attrs[0],"userPassword").find("*LK*") != -1) \
552 or GetAttr(Attrs[0],"userPassword").startswith("!"):
553 raise UDNotAllowedError, "This account is locked";
557 # Handle an [almost] arbitary change
558 def HandleChange(Reply,DnRecord,Key):
560 Lines = re.split("\n *\r?",PlainText);
572 # Try to process a command line
573 Result = Result + "> "+Line+"\n";
579 badkeys = LoadBadSSH()
580 Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \
581 DoArbChange(Line,Attrs) or DoSSH(Line,Attrs,badkeys,GetAttr(DnRecord,"uid")) or \
582 DoDel(Line,Attrs) or DoRBL(Line,Attrs) or DoConfirmSudopassword(Line, SudoPasswd)
585 Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
587 # Fail, if someone tries to send someone elses signed email to the
588 # daemon then we want to abort ASAP.
591 Result = Result + "Command is not understood. Halted - no changes committed\n";
593 Result = Result + Res + "\n";
595 # Connect to the ldap server
596 l = connect_to_ldap_and_check_if_locked(DnRecord)
598 if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go
600 Res = FinishConfirmSudopassword(l, GetAttr(DnRecord,"uid"), Attrs, SudoPasswd)
602 Result = Result + Res + "\n";
605 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n"%(e);
607 if CommitChanges == 1 and len(Attrs) > 0:
608 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
609 l.modify_s(Dn,Attrs);
613 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
615 raise UDNotAllowedError, "User not found"
616 Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]);
619 Subst["__FROM__"] = ChangeFrom;
620 Subst["__EMAIL__"] = EmailAddress(DnRecord);
621 Subst["__ADMIN__"] = ReplyTo;
622 Subst["__RESULT__"] = Result;
623 Subst["__ATTR__"] = Attribs;
625 return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read());
627 # Handle ping handles an email sent to the 'ping' address (ie this program
628 # called with a ping argument) It replies with a dump of the public records.
629 def HandlePing(Reply,DnRecord,Key):
631 Subst["__FROM__"] = PingFrom;
632 Subst["__EMAIL__"] = EmailAddress(DnRecord);
633 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord);
634 Subst["__ADMIN__"] = ReplyTo;
636 return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read());
640 def get_crypttype_preamble(key):
642 type = "Your message was encrypted using PGP 2.x\ncompatibility mode.";
644 type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
645 "mode, without IDEA. This message cannot be decoded using PGP 2.x";
648 # Handle a change password email sent to the change password address
649 # (this program called with the chpass argument)
650 def HandleChPass(Reply,DnRecord,Key):
651 # Generate a random password
652 Password = GenPass();
653 Pass = HashPass(Password);
655 # Use GPG to encrypt it
656 Message = GPGEncrypt("Your new password is '" + Password + "'\n",\
661 raise UDFormatError, "Unable to generate the encrypted reply, gpg failed.";
664 Subst["__FROM__"] = ChPassFrom;
665 Subst["__EMAIL__"] = EmailAddress(DnRecord);
666 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
667 Subst["__PASSWORD__"] = Message;
668 Subst["__ADMIN__"] = ReplyTo;
669 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
671 l = connect_to_ldap_and_check_if_locked(DnRecord)
672 # Modify the password
673 Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass),
674 (ldap.MOD_REPLACE,"shadowLastChange",str(int(time.time()/24/60/60)))];
675 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
680 def HandleChTOTPSeed(Reply, DnRecord, Key):
681 # Generate a random seed
682 seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
683 msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "0x"+Key[1],Key[4]);
686 raise UDFormatError, "Unable to generate the encrypted reply, gpg failed.";
689 Subst["__FROM__"] = ChPassFrom
690 Subst["__EMAIL__"] = EmailAddress(DnRecord)
691 Subst["__PASSWORD__"] = msg
692 Subst["__ADMIN__"] = ReplyTo
693 Reply = Reply + TemplateSubst(Subst, open(TemplatesDir+"totp-seed-changed", "r").read())
695 l = connect_to_ldap_and_check_if_locked(DnRecord)
696 # Modify the password
697 Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
698 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn
702 def HandleChKrbPass(Reply,DnRecord,Key):
703 # Connect to the ldap server, will throw an exception if account locked.
704 l = connect_to_ldap_and_check_if_locked(DnRecord)
706 user = GetAttr(DnRecord,"uid")
707 krb_proc = subprocess.Popen( ('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
708 krb_proc.stdin.close()
709 out = krb_proc.stdout.readlines()
711 exitcode = krb_proc.returncode
713 # Use GPG to encrypt it
714 m = "Tried to reset your kerberos principal's password.\n"
716 m += "The exitcode of the reset script was zero, indicating that everything\n"
717 m += "worked. However, this being software who knows. Script's output below."
719 m += "The exitcode of the reset script was %d, indicating that something\n"%(exitcode)
720 m += "went terribly, terribly wrong. Please consult the script's output below\n"
721 m += "for more information. Contact the admins if you have any questions or\n"
722 m += "require assitance."
724 m += "\n"+''.join( map(lambda x: "| "+x, out) )
726 Message = GPGEncrypt(m, "0x"+Key[1],Key[4]);
728 raise UDFormatError, "Unable to generate the encrypted reply, gpg failed.";
731 Subst["__FROM__"] = ChPassFrom;
732 Subst["__EMAIL__"] = EmailAddress(DnRecord);
733 Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key)
734 Subst["__PASSWORD__"] = Message;
735 Subst["__ADMIN__"] = ReplyTo;
736 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
740 # Start of main program
742 # Drop messages from a mailer daemon.
743 if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0:
746 ErrMsg = "Indeterminate Error";
747 ErrType = EX_TEMPFAIL;
749 # Startup the replay cache
750 ErrType = EX_TEMPFAIL;
751 ErrMsg = "Failed to initialize the replay cache:";
754 ErrType = EX_PERMFAIL;
755 ErrMsg = "Failed to understand the email or find a signature:";
756 mail = email.parser.Parser().parse(sys.stdin);
757 Msg = GetClearSig(mail);
759 ErrMsg = "Message is not PGP signed:"
760 if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \
761 Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1:
762 raise UDFormatError, "No PGP signature";
764 # Check the signature
765 ErrMsg = "Unable to check the signature or the signature was invalid:";
766 pgp = GPGCheckSig2(Msg[0])
769 raise UDFormatError, pgp.why
772 raise UDFormatError, "Null signature text"
774 # Extract the plain message text in the event of mime encoding
776 ErrMsg = "Problem stripping MIME headers from the decoded message"
778 e = email.parser.Parser().parsestr(pgp.text)
779 PlainText = e.get_payload(decode=True)
783 # Connect to the ldap server
784 ErrType = EX_TEMPFAIL;
785 ErrMsg = "An error occured while performing the LDAP lookup";
788 l.simple_bind_s("","");
790 # Search for the matching key fingerprint
791 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + pgp.key_fpr)
793 ErrType = EX_PERMFAIL;
795 raise UDFormatError, "Key not found"
797 raise UDFormatError, "Oddly your key fingerprint is assigned to more than one account.."
800 # Check the signature against the replay cache
801 RC = ReplayCache(ReplayCacheFile);
802 RC.process(pgp.sig_info)
804 # Determine the sender address
805 ErrMsg = "A problem occured while trying to formulate the reply";
806 Sender = mail['Reply-To']
807 if not Sender: Sender = mail['From']
808 if not Sender: raise UDFormatError, "Unable to determine the sender's address";
811 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
812 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date);
814 Res = l.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'] )
815 # Res is a list of tuples.
816 # The tuples contain a dn (str) and a dictionary.
817 # The dictionaries map the key "hostname" to a list.
818 # These lists contain a single hostname (str).
819 ValidHostNames = reduce(lambda a,b: a+b, [value.get("hostname", []) for (dn, value) in Res], [])
822 if sys.argv[1] == "ping":
823 Reply = HandlePing(Reply,Attrs[0],pgp.key_info);
824 elif sys.argv[1] == "chpass":
825 if PlainText.strip().find("Please change my Debian password") >= 0:
826 Reply = HandleChPass(Reply,Attrs[0],pgp.key_info);
827 elif PlainText.strip().find("Please change my Kerberos password") >= 0:
828 Reply = HandleChKrbPass(Reply,Attrs[0],pgp.key_info);
829 elif PlainText.strip().find("Please change my TOTP seed") >= 0:
830 Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info)
832 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.";
833 elif sys.argv[1] == "change":
834 Reply = HandleChange(Reply,Attrs[0],pgp.key_info);
837 raise UDFormatError, "Incorrect Invokation";
839 # Send the message through sendmail
840 ErrMsg = "A problem occured while trying to send the reply";
841 Child = os.popen("/usr/sbin/sendmail -t","w");
842 # Child = os.popen("cat","w");
844 if Child.close() != None:
845 raise UDExecuteError, "Sendmail gave a non-zero return code";
849 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
850 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date);
854 Subst["__ERROR__"] = ErrMsg;
855 Subst["__ADMIN__"] = ReplyTo;
857 Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
858 List = traceback.extract_tb(sys.exc_traceback);
860 Trace = Trace + "Python Stack Trace:\n";
862 Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]);
864 Subst["__TRACE__"] = Trace;
866 # Try to send the bounce
868 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read());
870 Child = os.popen("/usr/sbin/sendmail -t -oi -f ''","w");
871 Child.write(ErrReplyHead);
872 Child.write(ErrReply);
873 if Child.close() != None:
874 raise UDExecuteError, "Sendmail gave a non-zero return code";
876 sys.exit(EX_TEMPFAIL);
878 if ErrType != EX_PERMFAIL:
884 # vim:set shiftwidth=3: