#!/usr/bin/env python # -*- mode: python -*- # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008 # Copyright (c) 2009 Stephen Gran # Copyright (c) 2008,2009,2010 Peter Palfrader # Copyright (c) 2008 Joerg Jaspert # Copyright (c) 2010 Helmut Grohne import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands import pwd, tempfile import subprocess import email, email.parser import binascii from userdir_gpg import * from userdir_ldap import * from userdir_exceptions import * # Error codes from /usr/include/sysexits.h ReplyTo = ConfModule.replyto; PingFrom = ConfModule.pingfrom; ChPassFrom = ConfModule.chpassfrom; ChangeFrom = ConfModule.changefrom; ReplayCacheFile = ConfModule.replaycachefile; SSHFingerprintFile = ConfModule.fingerprintfile UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}' EX_TEMPFAIL = 75; EX_PERMFAIL = 65; # EX_DATAERR Error = 'Message Error'; SeenKey = 0; SeenDNS = 0; mailRBL = {} mailRHSBL = {} mailWhitelist = {} SeenList = {} DNS = {} ValidHostNames = [] # will be initialized in later SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$') SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+') GenderTable = {"male": '1', "1": '1', "female": '2', "2": '2', "unspecified": '9', "9": '9', }; ArbChanges = {"c": "..", "l": ".*", "facsimileTelephoneNumber": ".*", "telephoneNumber": ".*", "postalAddress": ".*", "bATVToken": ".*", "postalCode": ".*", "loginShell": ".*", "emailForward": "^([^<>@]+@.+)?$", "jabberJID": "^([^<>@]+@.+)?$", "ircNick": ".*", "icqUin": "^[0-9]*$", "onVacation": ".*", "labeledURI": ".*", "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$", "mailDisableMessage": ".*", "mailGreylisting": "^(TRUE|FALSE)$", "mailCallout": "^(TRUE|FALSE)$", "mailDefaultOptions": "^(TRUE|FALSE)$", "VoIP": ".*", "gender": "^(1|2|9|male|female|unspecified)$", "mailContentInspectionAction": "^(reject|blackhole|markup)$", }; DelItems = {"c": None, "l": None, "facsimileTelephoneNumber": None, "telephoneNumber": None, "postalAddress": None, "bATVToken": None, "postalCode": None, "emailForward": None, "ircNick": None, "onVacation": None, "labeledURI": None, "latitude": None, "longitude": None, "icqUin": None, "jabberJID": None, "jpegPhoto": None, "dnsZoneEntry": None, "sshRSAAuthKey": None, "birthDate" : None, "mailGreylisting": None, "mailCallout": None, "mailRBL": None, "mailRHSBL": None, "mailWhitelist": None, "mailDisableMessage": None, "mailDefaultOptions": None, "VoIP": None, "mailContentInspectionAction": None, }; # Decode a GPS location from some common forms def LocDecode(Str,Dir): # Check for Decimal degrees, DGM, or DGMS if re.match("^[+-]?[\d.]+$",Str) != None: return Str; Deg = '0'; Min = None; Sec = None; Dr = Dir[0]; # Check for DDDxMM.MMMM where x = [nsew] Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str); if Match != None: G = Match.groups(); Deg = G[0]; Min = G[2]; Dr = G[1]; # Check for DD.DD x Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str); if Match != None: G = Match.groups(); Deg = G[0]; Dr = G[1]; # Check for DD:MM.MM x Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str); if Match != None: G = Match.groups(); Deg = G[0]; Min = G[1]; Dr = G[2]; # Check for DD:MM:SS.SS x Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str); if Match != None: G = Match.groups(); Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3]; # Some simple checks if float(Deg) > 180: raise UDFormatError, "Bad degrees"; if Min != None and float(Min) > 60: raise UDFormatError, "Bad minutes"; if Sec != None and float(Sec) > 60: raise UDFormatError, "Bad seconds"; # Pad on an extra leading 0 to disambiguate small numbers if len(Deg) <= 1 or Deg[1] == '.': Deg = '0' + Deg; if Min != None and (len(Min) <= 1 or Min[1] == '.'): Min = '0' + Min; if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'): Sec = '0' + Sec; # Construct a DGM/DGMS type value from the components. Res = "+" if Dr == Dir[1]: Res = "-"; Res = Res + Deg; if Min != None: Res = Res + Min; if Sec != None: Res = Res + Sec; return Res; # Handle changing a set of arbitary fields # : value def DoArbChange(Str,Attrs): Match = re.match("^([^ :]+): (.*)$",Str); if Match == None: return None; G = Match.groups(); attrName = G[0].lower(); for i in ArbChanges.keys(): if i.lower() == attrName: attrName = i; break; if ArbChanges.has_key(attrName) == 0: return None; if re.match(ArbChanges[attrName],G[1]) == None: raise UDFormatError, "Item does not match the required format"+ArbChanges[attrName]; value = G[1]; if attrName == 'gender': if G[1] not in GenderTable: raise UDFormatError, "Gender not found in table" value = GenderTable[G[1]] # if attrName == 'birthDate': # (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",G[1]) { # $bd_yr = $1; $bd_mo = $2; $bd_day = $3; # if ($bd_mo > 0 and $bd_mo <= 12 and $bd_day > 0) { # if ($bd_mo == 2) { # if ($bd_day == 29 and ($bd_yr == 0 or ($bd_yr % 4 == 0 && ($bd_yr % 100 != 0 || $bd_yr % 400 == 0)))) { # $bd_ok = 1; # } elsif ($bd_day <= 28) { # $bd_ok = 1; # } # } elsif ($bd_mo == 4 or $bd_mo == 6 or $bd_mo == 9 or $bd_mo == 11) { # if ($bd_day <= 30) { # $bd_ok = 1; # } # } else { # if ($bd_day <= 31) { # $bd_ok = 1; # } # } # } # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) { # $bd_ok = 1; # } Attrs.append((ldap.MOD_REPLACE,attrName,value)); return "Changed entry %s to %s"%(attrName,value); # Handle changing a set of arbitary fields # : value def DoDel(Str,Attrs): Match = re.match("^del (.*)$",Str); if Match == None: return None; G = Match.groups(); attrName = G[0].lower(); for i in DelItems.keys(): if i.lower() == attrName: attrName = i; break; if DelItems.has_key(attrName) == 0: return "Cannot erase entry %s"%(attrName); Attrs.append((ldap.MOD_DELETE,attrName,None)); return "Removed entry %s"%(attrName); # Handle a position change message, the line format is: # Lat: -12412.23 Long: +12341.2342 def DoPosition(Str,Attrs): Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower()) if Match == None: return None; G = Match.groups(); try: sLat = LocDecode(G[0],"ns"); sLong = LocDecode(G[1],"ew"); Lat = DecDegree(sLat,1); Long = DecDegree(sLong,1); except: raise UDFormatError, "Positions were found, but they are not correctly formed"; Attrs.append((ldap.MOD_REPLACE,"latitude",sLat)); Attrs.append((ldap.MOD_REPLACE,"longitude",sLong)); return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long); # Load bad ssh fingerprints def LoadBadSSH(): f = open(SSHFingerprintFile, "r") bad = [] FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$') for line in f.readlines(): Match = FingerprintLine.match(line) if Match is not None: g = Match.groups() bad.append(g[0]) return bad # Handle an SSH authentication key, the line format is: # [options] 1024 35 13188913666680[..] [comment] # maybe it really should be: # [allowed_hosts=machine1,machine2 ][options ]ssh-rsa keybytes [comment] machine_regex = re.compile("^[0-9a-zA-Z.-]+$") def DoSSH(Str, Attrs, badkeys, uid): Match = SSH2AuthSplit.match(Str); if Match == None: return None; g = Match.groups() typekey = g[1] if Match == None: Match = SSHRSA1Match.match(Str) if Match is not None: return "RSA1 keys not supported anymore" return None; # lines can now be prepended with "allowed_hosts=machine1,machine2 " machines = [] if Str.startswith("allowed_hosts="): Str = Str.split("=", 1)[1] if ' ' not in Str: return "invalid ssh key syntax with machine specification" machines, Str = Str.split(' ', 1) machines = machines.split(",") for m in machines: if not m: return "empty machine specification for ssh key" if not machine_regex.match(m): return "machine specification for ssh key contains invalid characters" if m not in ValidHostNames: return "unknown machine used in allowed_hosts stanza for ssh keys" (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp") f = open(path, "w") f.write("%s\n" % (Str)) f.close() cmd = "/usr/bin/ssh-keygen -l -f %s < /dev/null" % (path) (result, output) = commands.getstatusoutput(cmd) os.remove(path) if (result != 0): raise UDExecuteError, "ssh-keygen -l invocation failed!\n%s\n" % (output) # format the string again for ldap: if machines: Str = "allowed_hosts=%s %s" % (",".join(machines), Str) # Head Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time())) ErrReplyHead = "From: %s\nCc: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],os.environ['SENDER'],ReplyTo,Date) Subst = {} Subst["__ADMIN__"] = ReplyTo Subst["__USER__"] = uid Match = SSHFingerprint.match(output) if Match is None: return "Failed to match SSH fingerprint, has the output of ssh-keygen changed?" g = Match.groups() key_size = g[0] fingerprint = g[1] if typekey == "rsa": key_size_ok = (int(key_size) >= 2048) elif typekey == "ed25519": key_size_ok = True else: key_size_ok = False if not key_size_ok: return "SSH key fails formal criteria, not added. We only accept RSA keys (>= 2048 bits) or ed25519 keys." elif fingerprint in badkeys: try: # Body Subst["__ERROR__"] = "SSH key with fingerprint %s known as bad key" % (g[1]) ErrReply = TemplateSubst(Subst,open(TemplatesDir+"admin-info","r").read()) Child = os.popen("/usr/sbin/sendmail -t","w") Child.write(ErrReplyHead) Child.write(ErrReply) if Child.close() != None: raise UDExecuteError, "Sendmail gave a non-zero return code" except: sys.exit(EX_TEMPFAIL) # And now break and stop processing input, which sends a reply to the user. raise UDFormatError, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL" global SeenKey; if SeenKey: Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str)); return "SSH Key added: %s %s [%s]"%(key_size, fingerprint, FormatSSHAuth(Str)) Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str)); SeenKey = 1; return "SSH Keys replaced with: %s %s [%s]"%(key_size, fingerprint, FormatSSHAuth(Str)) # Handle changing a dns entry # host IN A 12.12.12.12 # host IN AAAA 1234::5678 # host IN CNAME foo.bar. <- Trailing dot is required # host IN MX foo.bar. <- Trailing dot is required def DoDNS(Str,Attrs,DnRecord): cnamerecord = re.match("^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$",Str,re.IGNORECASE) arecord = re.match('^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$',Str,re.IGNORECASE) mxrecord = re.match("^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$",Str,re.IGNORECASE) txtrecord = re.match("^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE) #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE) aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE) if cnamerecord is None and\ arecord is None and\ mxrecord is None and\ txtrecord is None and\ aaaarecord is None: return None; # Check if the name is already taken G = re.match('^([-\w+]+)\s',Str) if G is None: raise UDFormatError, "Hostname not found although we already passed record syntax checks" hostname = G.group(1) # Check for collisions global l; # [JT 20070409 - search for both tab and space suffixed hostnames # since we accept either. It'd probably be better to parse the # incoming string in order to construct what we feed LDAP rather # than just passing it through as is.] filter = "(|(dnsZoneEntry=%s *)(dnsZoneEntry=%s *))" % (hostname, hostname) Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,filter,["uid"]); for x in Rec: if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"): return "DNS entry is already owned by " + GetAttr(x,"uid") global SeenDNS; global DNS; if cnamerecord: if DNS.has_key(hostname): return "CNAME and other RR types not allowed: "+Str else: DNS[hostname] = 2 else: if DNS.has_key(hostname) and DNS[hostname] == 2: return "CNAME and other RR types not allowed: "+Str else: DNS[hostname] = 1 if cnamerecord is not None: sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1)) elif txtrecord is not None: sanitized = "%s IN TXT %s" % (hostname, txtrecord.group(1)) elif arecord is not None: ipaddress = arecord.group(1) for quad in ipaddress.split('.'): if not (int(quad) >=0 and int(quad) <= 255): return "Invalid quad %s in IP address %s in line %s" %(quad, ipaddress, Str) sanitized = "%s IN A %s"% (hostname, ipaddress) elif mxrecord is not None: priority = mxrecord.group(1) mx = mxrecord.group(2) sanitized = "%s IN MX %s %s" % (hostname, priority, mx) elif aaaarecord is not None: ipv6address = aaaarecord.group(1) parts = ipv6address.split(':') if len(parts) > 8: return "Invalid IPv6 address (%s): too many parts"%(ipv6address) if len(parts) <= 2: return "Invalid IPv6 address (%s): too few parts"%(ipv6address) if parts[0] == "": parts.pop(0) if parts[-1] == "": parts.pop(-1) seenEmptypart = False for p in parts: if len(p) > 4: return "Invalid IPv6 address (%s): part %s is longer than 4 characters"%(ipv6address, p) if p == "": if seenEmptypart: return "Invalid IPv6 address (%s): more than one :: (nothing in between colons) is not allowed"%(ipv6address) seenEmptypart = True sanitized = "%s IN AAAA %s" % (hostname, ipv6address) else: raise UDFormatError, "None of the types I recognize was it. I shouldn't be here. confused." if SeenDNS: Attrs.append((ldap.MOD_ADD,"dnsZoneEntry",sanitized)); return "DNS Entry added "+sanitized; Attrs.append((ldap.MOD_REPLACE,"dnsZoneEntry",sanitized)); SeenDNS = 1; return "DNS Entry replaced with "+sanitized; # Handle an RBL list (mailRBL, mailRHSBL, mailWhitelist) def DoRBL(Str,Attrs): Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower()) if Match == None: return None if Match.group(1) == "rbl": Key = "mailRBL" if Match.group(1) == "rhsbl": Key = "mailRHSBL" if Match.group(1) == "whitelist": Key = "mailWhitelist" Host = Match.group(2) global SeenList if SeenList.has_key(Key): Attrs.append((ldap.MOD_ADD,Key,Host)) return "%s added %s" % (Key,Host) Attrs.append((ldap.MOD_REPLACE,Key,Host)) SeenList[Key] = 1; return "%s replaced with %s" % (Key,Host) # Handle a ConfirmSudoPassword request def DoConfirmSudopassword(Str, SudoPasswd): Match = re.compile('^confirm sudopassword ('+UUID_FORMAT+') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str) if Match == None: return None uuid = Match.group(1) hosts = Match.group(2) hmac = Match.group(3) SudoPasswd[uuid] = (hosts, hmac) return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid,hosts, hmac) def FinishConfirmSudopassword(l, uid, Attrs, SudoPasswd): result = "\n" if len(SudoPasswd) == 0: return None res = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+uid, ['sudoPassword']); if len(res) != 1: raise UDFormatError, "Not exactly one hit when searching for user" if res[0][1].has_key('sudoPassword'): inldap = res[0][1]['sudoPassword'] else: inldap = [] newldap = [] for entry in inldap: Match = re.compile('^('+UUID_FORMAT+') (confirmed:[0-9a-f]{40}|unconfirmed) ([a-z0-9.,*-]+) ([^ ]+)$').match(entry) if Match == None: raise UDFormatError, "Could not parse existing sudopasswd entry" uuid = Match.group(1) status = Match.group(2) hosts = Match.group(3) cryptedpass = Match.group(4) if SudoPasswd.has_key(uuid): confirmedHosts = SudoPasswd[uuid][0] confirmedHmac = SudoPasswd[uuid][1] if status.startswith('confirmed:'): if status == 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass): result = result + "Entry %s for sudo password on hosts %s already confirmed.\n"%(uuid, hosts) else: result = result + "Entry %s for sudo password on hosts %s is listed as confirmed, but HMAC does not verify.\n"%(uuid, hosts) elif confirmedHosts != hosts: result = result + "Entry %s hostlist mismatch (%s vs. %s).\n"%(uuid, hosts, confirmedHosts) elif make_passwd_hmac('confirm-new-password', 'sudo', uid, uuid, hosts, cryptedpass) == confirmedHmac: result = result + "Entry %s for sudo password on hosts %s now confirmed.\n"%(uuid, hosts) status = 'confirmed:'+make_passwd_hmac('password-is-confirmed', 'sudo', uid, uuid, hosts, cryptedpass) else: result = result + "Entry %s for sudo password on hosts %s HMAC verify failed.\n"%(uuid, hosts) del SudoPasswd[uuid] newentry = " ".join([uuid, status, hosts, cryptedpass]) if len(newldap) == 0: newldap.append((ldap.MOD_REPLACE,"sudoPassword",newentry)) else: newldap.append((ldap.MOD_ADD,"sudoPassword",newentry)) for entry in SudoPasswd: result = result + "Entry %s that you confirm is not listed in ldap."%(entry) for entry in newldap: Attrs.append(entry) return result def connect_to_ldap_and_check_if_locked(DnRecord): # Connect to the ldap server l = connectLDAP() F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r"); AccessPass = F.readline().strip().split(" ") F.close(); l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]); # Check for a locked account Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid")); if (GetAttr(Attrs[0],"userPassword").find("*LK*") != -1) \ or GetAttr(Attrs[0],"userPassword").startswith("!"): raise UDNotAllowedError, "This account is locked"; return l # Handle an [almost] arbitary change def HandleChange(Reply,DnRecord,Key): global PlainText; Lines = re.split("\n *\r?",PlainText); Result = ""; Attrs = []; SudoPasswd = {} Show = 0; CommitChanges = 1 for Line in Lines: Line = Line.strip() if Line == "": continue; # Try to process a command line Result = Result + "> "+Line+"\n"; try: if Line == "show": Show = 1; Res = "OK"; else: badkeys = LoadBadSSH() Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \ DoArbChange(Line,Attrs) or DoSSH(Line,Attrs,badkeys,GetAttr(DnRecord,"uid")) or \ DoDel(Line,Attrs) or DoRBL(Line,Attrs) or DoConfirmSudopassword(Line, SudoPasswd) except: Res = None; Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value); # Fail, if someone tries to send someone elses signed email to the # daemon then we want to abort ASAP. if Res == None: CommitChanges = 0 Result = Result + "Command is not understood. Halted - no changes committed\n"; break; Result = Result + Res + "\n"; # Connect to the ldap server l = connect_to_ldap_and_check_if_locked(DnRecord) if CommitChanges == 1 and len(SudoPasswd) > 0: # only if we are still good to go try: Res = FinishConfirmSudopassword(l, GetAttr(DnRecord,"uid"), Attrs, SudoPasswd) if not Res is None: Result = Result + Res + "\n"; except Error, e: CommitChanges = 0 Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n"%(e); if CommitChanges == 1 and len(Attrs) > 0: Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn; l.modify_s(Dn,Attrs); Attribs = ""; if Show == 1: Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid")); if len(Attrs) == 0: raise UDNotAllowedError, "User not found" Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]); Subst = {}; Subst["__FROM__"] = ChangeFrom; Subst["__EMAIL__"] = EmailAddress(DnRecord); Subst["__ADMIN__"] = ReplyTo; Subst["__RESULT__"] = Result; Subst["__ATTR__"] = Attribs; return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read()); # Handle ping handles an email sent to the 'ping' address (ie this program # called with a ping argument) It replies with a dump of the public records. def HandlePing(Reply,DnRecord,Key): Subst = {}; Subst["__FROM__"] = PingFrom; Subst["__EMAIL__"] = EmailAddress(DnRecord); Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord); Subst["__ADMIN__"] = ReplyTo; return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read()); def get_crypttype_preamble(key): if (key[4] == 1): type = "Your message was encrypted using PGP 2.x\ncompatibility mode."; else: type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\ "mode, without IDEA. This message cannot be decoded using PGP 2.x"; return type # Handle a change password email sent to the change password address # (this program called with the chpass argument) def HandleChPass(Reply,DnRecord,Key): # Generate a random password Password = GenPass(); Pass = HashPass(Password); # Use GPG to encrypt it Message = GPGEncrypt("Your new password is '" + Password + "'\n",\ "0x"+Key[1],Key[4]); Password = None; if Message == None: raise UDFormatError, "Unable to generate the encrypted reply, gpg failed."; Subst = {}; Subst["__FROM__"] = ChPassFrom; Subst["__EMAIL__"] = EmailAddress(DnRecord); Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key) Subst["__PASSWORD__"] = Message; Subst["__ADMIN__"] = ReplyTo; Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read()); l = connect_to_ldap_and_check_if_locked(DnRecord) # Modify the password Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass), (ldap.MOD_REPLACE,"shadowLastChange",str(int(time.time()/24/60/60)))]; Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn; l.modify_s(Dn,Rec); return Reply; def HandleChTOTPSeed(Reply, DnRecord, Key): # Generate a random seed seed = binascii.hexlify(open("/dev/urandom", "r").read(32)) msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "0x"+Key[1],Key[4]); if msg is None: raise UDFormatError, "Unable to generate the encrypted reply, gpg failed."; Subst = {}; Subst["__FROM__"] = ChPassFrom Subst["__EMAIL__"] = EmailAddress(DnRecord) Subst["__PASSWORD__"] = msg Subst["__ADMIN__"] = ReplyTo Reply = Reply + TemplateSubst(Subst, open(TemplatesDir+"totp-seed-changed", "r").read()) l = connect_to_ldap_and_check_if_locked(DnRecord) # Modify the password Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)] Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn l.modify_s(Dn,Rec) return Reply; def HandleChKrbPass(Reply,DnRecord,Key): # Connect to the ldap server, will throw an exception if account locked. l = connect_to_ldap_and_check_if_locked(DnRecord) user = GetAttr(DnRecord,"uid") krb_proc = subprocess.Popen( ('ud-krb-reset', user), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) krb_proc.stdin.close() out = krb_proc.stdout.readlines() krb_proc.wait() exitcode = krb_proc.returncode # Use GPG to encrypt it m = "Tried to reset your kerberos principal's password.\n" if exitcode == 0: m += "The exitcode of the reset script was zero, indicating that everything\n" m += "worked. However, this being software who knows. Script's output below." else: m += "The exitcode of the reset script was %d, indicating that something\n"%(exitcode) m += "went terribly, terribly wrong. Please consult the script's output below\n" m += "for more information. Contact the admins if you have any questions or\n" m += "require assitance." m += "\n"+''.join( map(lambda x: "| "+x, out) ) Message = GPGEncrypt(m, "0x"+Key[1],Key[4]); if Message == None: raise UDFormatError, "Unable to generate the encrypted reply, gpg failed."; Subst = {}; Subst["__FROM__"] = ChPassFrom; Subst["__EMAIL__"] = EmailAddress(DnRecord); Subst["__CRYPTTYPE__"] = get_crypttype_preamble(Key) Subst["__PASSWORD__"] = Message; Subst["__ADMIN__"] = ReplyTo; Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read()); return Reply; # Start of main program # Drop messages from a mailer daemon. if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0: sys.exit(0); ErrMsg = "Indeterminate Error"; ErrType = EX_TEMPFAIL; try: # Startup the replay cache ErrType = EX_TEMPFAIL; ErrMsg = "Failed to initialize the replay cache:"; # Get the email ErrType = EX_PERMFAIL; ErrMsg = "Failed to understand the email or find a signature:"; mail = email.parser.Parser().parse(sys.stdin); Msg = GetClearSig(mail); ErrMsg = "Message is not PGP signed:" if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \ Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1: raise UDFormatError, "No PGP signature"; # Check the signature ErrMsg = "Unable to check the signature or the signature was invalid:"; pgp = GPGCheckSig2(Msg[0]) if not pgp.ok: raise UDFormatError, pgp.why if pgp.text is None: raise UDFormatError, "Null signature text" # Extract the plain message text in the event of mime encoding global PlainText; ErrMsg = "Problem stripping MIME headers from the decoded message" if Msg[1] == 1: e = email.parser.Parser().parsestr(pgp.text) PlainText = e.get_payload(decode=True) else: PlainText = pgp.text # Connect to the ldap server ErrType = EX_TEMPFAIL; ErrMsg = "An error occured while performing the LDAP lookup"; global l; l = connectLDAP() l.simple_bind_s("",""); # Search for the matching key fingerprint Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + pgp.key_fpr) ErrType = EX_PERMFAIL; if len(Attrs) == 0: raise UDFormatError, "Key not found" if len(Attrs) != 1: raise UDFormatError, "Oddly your key fingerprint is assigned to more than one account.." # Check the signature against the replay cache RC = ReplayCache(ReplayCacheFile); RC.process(pgp.sig_info) # Determine the sender address ErrMsg = "A problem occured while trying to formulate the reply"; Sender = mail['Reply-To'] if not Sender: Sender = mail['From'] if not Sender: raise UDFormatError, "Unable to determine the sender's address"; # Formulate a reply Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time())); Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date); Res = l.search_s(HostBaseDn, ldap.SCOPE_SUBTREE, '(objectClass=debianServer)', ['hostname'] ) # Res is a list of tuples. # The tuples contain a dn (str) and a dictionary. # The dictionaries map the key "hostname" to a list. # These lists contain a single hostname (str). ValidHostNames = reduce(lambda a,b: a+b, [value.get("hostname", []) for (dn, value) in Res], []) # Dispatch if sys.argv[1] == "ping": Reply = HandlePing(Reply,Attrs[0],pgp.key_info); elif sys.argv[1] == "chpass": if PlainText.strip().find("Please change my Debian password") >= 0: Reply = HandleChPass(Reply,Attrs[0],pgp.key_info); elif PlainText.strip().find("Please change my Kerberos password") >= 0: Reply = HandleChKrbPass(Reply,Attrs[0],pgp.key_info); elif PlainText.strip().find("Please change my TOTP seed") >= 0: Reply = HandleChTOTPSeed(Reply, Attrs[0], pgp.key_info) else: 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."; elif sys.argv[1] == "change": Reply = HandleChange(Reply,Attrs[0],pgp.key_info); else: print sys.argv; raise UDFormatError, "Incorrect Invokation"; # Send the message through sendmail ErrMsg = "A problem occured while trying to send the reply"; Child = os.popen("/usr/sbin/sendmail -t","w"); # Child = os.popen("cat","w"); Child.write(Reply); if Child.close() != None: raise UDExecuteError, "Sendmail gave a non-zero return code"; except: # Error Reply Header Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time())); ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date); # Error Body Subst = {}; Subst["__ERROR__"] = ErrMsg; Subst["__ADMIN__"] = ReplyTo; Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value); List = traceback.extract_tb(sys.exc_traceback); if len(List) > 1: Trace = Trace + "Python Stack Trace:\n"; for x in List: Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]); Subst["__TRACE__"] = Trace; # Try to send the bounce try: ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read()); Child = os.popen("/usr/sbin/sendmail -t -oi -f ''","w"); Child.write(ErrReplyHead); Child.write(ErrReply); if Child.close() != None: raise UDExecuteError, "Sendmail gave a non-zero return code"; except: sys.exit(EX_TEMPFAIL); if ErrType != EX_PERMFAIL: sys.exit(ErrType); sys.exit(0); # vim:set et: # vim:set ts=3: # vim:set shiftwidth=3: