X-Git-Url: https://git.adam-barratt.org.uk/?p=mirror%2Fuserdir-ldap.git;a=blobdiff_plain;f=ud-mailgate;h=30af5831aed09c0b05ca80d9630449faf1a6407e;hp=4fa2edf0f1f3ee6f043d5be7bde8fb8b0a787946;hb=HEAD;hpb=c626017071b2de3c4623df898dcf0e16f25e7272 diff --git a/ud-mailgate b/ud-mailgate index 4fa2edf..30af583 100755 --- a/ud-mailgate +++ b/ud-mailgate @@ -2,42 +2,65 @@ # -*- mode: python -*- # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008 -# Copyright (c) 2008 Peter Palfrader +# 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 +import userdir_ldap +import sys +import traceback +import time +import ldap +import os +import commands +import pwd +import tempfile +import subprocess +import email +import email.parser +import binascii -import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands -import pwd, tempfile 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; +ReplyTo = ConfModule.replyto +PingFrom = ConfModule.pingfrom +ChPassFrom = ConfModule.chpassfrom +ChangeFrom = ConfModule.changefrom +ReplayCacheFile = ConfModule.replaycachefile SSHFingerprintFile = ConfModule.fingerprintfile +TOTPTicketDirectory = ConfModule.totpticketdirectory +WebUILocation = ConfModule.webuilocation -EX_TEMPFAIL = 75; -EX_PERMFAIL = 65; # EX_DATAERR -Error = 'Message Error'; -SeenKey = 0; -SeenDNS = 0; +UUID_FORMAT = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}' +machine_regex = re.compile("^[0-9a-zA-Z.-]+$") + +EX_TEMPFAIL = 75 +EX_PERMFAIL = 65 # EX_DATAERR +Error = 'Message Error' +SeenKey = 0 +SeenDNS = 0 mailRBL = {} mailRHSBL = {} mailWhitelist = {} SeenList = {} DNS = {} +ValidHostNames = [] # will be initialized in later -SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$') -SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+') +SSHFingerprint = re.compile(r'^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$') +SSHRSA1Match = re.compile(r'^^(.* )?\d+ \d+ \d+') ArbChanges = {"c": "..", - "l": ".*", - "facsimileTelephoneNumber": ".*", - "telephoneNumber": ".*", - "postalAddress": ".*", - "postalCode": ".*", + "l": ".*", + "facsimileTelephoneNumber": ".*", + "telephoneNumber": ".*", + "postalAddress": ".*", + "bATVToken": ".*", + "postalCode": ".*", "loginShell": ".*", "emailForward": "^([^<>@]+@.+)?$", "jabberJID": "^([^<>@]+@.+)?$", @@ -47,654 +70,835 @@ ArbChanges = {"c": "..", "labeledURI": ".*", "birthDate": "^([0-9]{4})([01][0-9])([0-3][0-9])$", "mailDisableMessage": ".*", - "mailGreylisting": "^(TRUE|FALSE)$", - "mailCallout": "^(TRUE|FALSE)$", - "VoIP": ".*", -}; + "mailGreylisting": "^(TRUE|FALSE)$", + "mailCallout": "^(TRUE|FALSE)$", + "mailDefaultOptions": "^(TRUE|FALSE)$", + "VoIP": ".*", + "mailContentInspectionAction": "^(reject|blackhole|markup)$", } 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, + "latitude": None, + "longitude": None, "icqUin": None, "jabberJID": None, "jpegPhoto": None, "dnsZoneEntry": None, - "sshRSAAuthKey": None, - "sshDSAAuthKey": None, - "birthDate" : 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+"])$",Str); - if Match != None: - G = Match.groups(); - Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3]; - - # Some simple checks - if float(Deg) > 180: - raise "Failed","Bad degrees"; - if Min != None and float(Min) > 60: - raise "Failed","Bad minutes"; - if Sec != None and float(Sec) > 60: - raise "Failed","Bad seconds"; - - # Pad on an extra leading 0 to disambiguate small numbers - if len(Deg) <= 1 or Deg[1] == '.': - Deg = '0' + Deg; - if Min != None and (len(Min) <= 1 or Min[1] == '.'): - Min = '0' + Min; - if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'): - Sec = '0' + Sec; - - # Construct a DGM/DGMS type value from the components. - Res = "+" - if Dr == Dir[1]: - Res = "-"; - Res = Res + Deg; - if Min != None: - Res = Res + Min; - if Sec != None: - Res = Res + Sec; - return Res; - +def LocDecode(Str, Dir): + # Check for Decimal degrees, DGM, or DGMS + if re.match(r"^[+-]?[\d.]+$", Str) is not None: + return Str + + Deg = '0' + Min = None + Sec = None + Dr = Dir[0] + + # Check for DDDxMM.MMMM where x = [nsew] + Match = re.match(r"^(\d+)([" + Dir + r"])([\d.]+)$", Str) + if Match: + G = Match.groups() + Deg = G[0] + Min = G[2] + Dr = G[1] + + # Check for DD.DD x + Match = re.match(r"^([\d.]+) ?([" + Dir + r"])$", Str) + if Match: + G = Match.groups() + Deg = G[0] + Dr = G[1] + + # Check for DD:MM.MM x + Match = re.match(r"^(\d+):([\d.]+) ?([" + Dir + "])$", Str) + if Match: + G = Match.groups() + Deg = G[0] + Min = G[1] + Dr = G[2] + + # Check for DD:MM:SS.SS x + Match = re.match(r"^(\d+):(\d+):([\d.]+) ?([" + Dir + "])$", Str) + if Match: + 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 is not None and float(Min) > 60: + raise UDFormatError("Bad minutes") + if Sec is not 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 is not None and (len(Min) <= 1 or Min[1] == '.'): + Min = '0' + Min + if Sec is not 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 is not None: + Res = Res + Min + if Sec is not None: + Res = Res + Sec + return Res + + # Handle changing a set of arbitary fields # : value -def DoArbChange(Str,Attrs): - Match = re.match("^([^ :]+): (.*)$",Str); - if Match == None: - return None; - G = Match.groups(); - - attrName = G[0].lower(); - for i in ArbChanges.keys(): - if i.lower() == attrName: - attrName = i; - break; - if ArbChanges.has_key(attrName) == 0: - return None; - - if re.match(ArbChanges[attrName],G[1]) == None: - raise Error, "Item does not match the required format"+ArbChanges[attrName]; - -# if attrName == 'birthDate': -# (re.match("^([0-9]{4})([01][0-9])([0-3][0-9])$",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 $query->param('birthdate') =~ /^\s*$/) { -# $bd_ok = 1; -# } - Attrs.append((ldap.MOD_REPLACE,attrName,G[1])); - return "Changed entry %s to %s"%(attrName,G[1]); +def DoArbChange(Str, Attrs): + Match = re.match("^([^ :]+): (.*)$", Str) + if Match is None: + return None + G = Match.groups() + + attrName = G[0].lower() + for i in ArbChanges.keys(): + if i.lower() == attrName: + attrName = i + break + if attrName not in ArbChanges: + return None + + value = G[1] + if re.match(ArbChanges[attrName], value) is None: + raise UDFormatError("Item does not match the required format" + ArbChanges[attrName]) + + 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 (.*)$",Str); - if Match == None: - return None; - G = Match.groups(); - - attrName = G[0].lower(); - for i in DelItems.keys(): - if i.lower() == attrName: - attrName = i; - break; - if DelItems.has_key(attrName) == 0: - return "Cannot erase entry %s"%(attrName); - - Attrs.append((ldap.MOD_DELETE,attrName,None)); - return "Removed entry %s"%(attrName); +def DoDel(Str, Attrs): + Match = re.match("^del (.*)$", Str) + if Match is None: + return None + G = Match.groups() + + attrName = G[0].lower() + for i in DelItems.keys(): + if i.lower() == attrName: + attrName = i + break + if attrName not in DelItems: + 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])?)$", Str.lower()) - if Match == None: - return None; - - G = Match.groups(); - try: - sLat = LocDecode(G[0],"ns"); - sLong = LocDecode(G[1],"ew"); - Lat = DecDegree(sLat,1); - Long = DecDegree(sLong,1); - except: - raise Error, "Positions were found, but they are not correctly formed"; - - Attrs.append((ldap.MOD_REPLACE,"latitude",sLat)); - Attrs.append((ldap.MOD_REPLACE,"longitude",sLong)); - return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long); +def DoPosition(Str, Attrs): + Match = re.match(r"^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$", Str.lower()) + if Match is 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 Exception: + 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}).*$') - for line in f.readlines(): - Match = FingerprintLine.match(line) - if Match is not None: - g = Match.groups() - bad.append(g[0]) - return bad + f = open(SSHFingerprintFile, "r") + bad = [] + FingerprintLine = re.compile(r'^([0-9a-f:]{47}).*$') + 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] 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; - - (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 Error, "ssh-keygen -l invocation failed!\n%s\n" % (output) - - - # 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) - g = Match.groups() - - if int(g[0]) < 1024: - try: - # Body - Subst["__ERROR__"] = "SSH keysize %s is below limit 1024" % (g[0]) - 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 Error, "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 Error, "SSH keys must have at least 1024 bits, processing halted, NOTHING MODIFIED AT ALL" - elif g[1] 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 Error, "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 Error, "Submitted SSH Key known to be bad and insecure, processing halted, NOTHING MODIFIED AT ALL" - - if (typekey == "dss"): - return "DSA keys not accepted anymore" - - global SeenKey; - if SeenKey: - Attrs.append((ldap.MOD_ADD,"sshRSAAuthKey",Str)); - return "SSH Key added "+FormatSSHAuth(Str); - - Attrs.append((ldap.MOD_REPLACE,"sshRSAAuthKey",Str)); - SeenKey = 1; - return "SSH Keys replaced with "+FormatSSHAuth(Str); + Match = SSH2AuthSplit.match(Str) + if Match is None: + return None + g = Match.groups() + typekey = g[1] + if Match is 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".format(m) + + (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() is not None: + raise UDExecuteError("Sendmail gave a non-zero return code") + except Exception: + 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.]+\.)$",Str,re.IGNORECASE) - #aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE) - aaaarecord = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE) - - if cnamerecord == None and\ - arecord == None and\ - mxrecord == None and\ - aaaarecord == None: - return None; - - # Check if the name is already taken - G = re.match('^([-\w+]+)\s',Str) - if G == None: - raise Error, "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 != None: - sanitized = "%s IN CNAME %s" % (hostname, cnamerecord.group(1)) - elif arecord != 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 != None: - priority = mxrecord.group(1) - mx = mxrecord.group(2) - sanitized = "%s IN MX %s %s" % (hostname, priority, mx) - elif aaaarecord != 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 Error, "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; +def DoDNS(Str, Attrs, DnRecord): + cnamerecord = re.match(r"^[-\w]+\s+IN\s+CNAME\s+([-\w.]+\.)$", Str, re.IGNORECASE) + arecord = re.match(r'^[-\w]+\s+IN\s+A\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$', Str, re.IGNORECASE) + mxrecord = re.match(r"^[-\w]+\s+IN\s+MX\s+(\d{1,3})\s+([-\w.]+\.)$", Str, re.IGNORECASE) + txtrecord = re.match(r"^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE) + aaaarecord = re.match(r'^[-\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 for punycode. We ought to validate it before we allow it in our zone. + if Str.lower().startswith('xn--'): + return "Punycode not allowed: " + Str + + # Check if the name is already taken + G = re.match(r'^([-\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 lc + # [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 = lc.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 hostname in DNS: + return "CNAME and other RR types not allowed: " + Str + else: + DNS[hostname] = 2 + else: + if DNS.get(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) +def DoRBL(Str, Attrs): + Match = re.compile('^mail(rbl|rhsbl|whitelist) ([-a-z0-9.]+)$').match(Str.lower()) + if Match is None: + return None + + if Match.group(1) == "rbl": + Key = "mailRBL" + if Match.group(1) == "rhsbl": + Key = "mailRHSBL" + if Match.group(1) == "whitelist": + Key = "mailWhitelist" + Host = Match.group(2) + + global SeenList + if Key in SeenList: + Attrs.append((ldap.MOD_ADD, Key, Host)) + return "%s added %s" % (Key, Host) + + Attrs.append((ldap.MOD_REPLACE, Key, Host)) + SeenList[Key] = 1 + return "%s replaced with %s" % (Key, Host) + + +# Handle a ConfirmSudoPassword request +def DoConfirmSudopassword(Str, SudoPasswd): + Match = re.compile('^confirm sudopassword (' + UUID_FORMAT + ') ([a-z0-9.,*-]+) ([0-9a-f]{40})$').match(Str) + if Match is 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(lc, uid, Attrs, SudoPasswd): + result = "\n" + + if len(SudoPasswd) == 0: + return None + + res = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "uid=" + uid, ['sudoPassword']) + if len(res) != 1: + raise UDFormatError("Not exactly one hit when searching for user") + if 'sudoPassword' in res[0][1]: + 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 is 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 uuid in SudoPasswd: + 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 += "Entry %s for sudo password on hosts %s already confirmed.\n" % (uuid, hosts) + else: + 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 += "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 += "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 += "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 += "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 + lc = connectLDAP() + F = open(PassDir + "/pass-" + pwd.getpwuid(os.getuid())[0], "r") + AccessPass = F.readline().strip().split(" ") + F.close() + lc.simple_bind_s("uid={},{}".format(AccessPass[0], BaseDn), AccessPass[1]) + + # Check for a locked account + Attrs = lc.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 lc + # Handle an [almost] arbitary change -def HandleChange(Reply,DnRecord,Key): - global PlainText; - Lines = re.split("\n *\r?",PlainText); - - Result = ""; - Attrs = []; - Show = 0; - 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) - 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: - Result = Result + "Command is not understood. Halted\n"; - break; - Result = Result + Res + "\n"; - - # Connect to the ldap server - l = ldap.open(LDAPServer); - F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r"); - AccessPass = F.readline().strip().split(" ") - F.close(); - - # Modify the record - l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]); - oldAttrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid")); - if ((GetAttr(oldAttrs[0],"userPassword").find("*LK*") != -1) - or GetAttr(oldAttrs[0],"userPassword").startswith("!")): - raise Error, "This account is locked"; - 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 Error, "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()); - +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 += "> " + 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 Exception: + Res = None + 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 is None: + CommitChanges = 0 + Result = Result + "Command is not understood. Halted - no changes committed\n" + break + Result += Res + "\n" + + # Connect to the ldap server + lc = 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(lc, GetAttr(DnRecord, "uid"), Attrs, SudoPasswd) + if Res is not None: + 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 + lc.modify_s(Dn, Attrs) + + Attribs = "" + if Show == 1: + Attrs = lc.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; +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 - return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read()); # 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 Error, "Unable to generate the encrypted reply, gpg failed."; - - 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"; - - Subst = {}; - Subst["__FROM__"] = ChPassFrom; - Subst["__EMAIL__"] = EmailAddress(DnRecord); - Subst["__CRYPTTYPE__"] = Type; - Subst["__PASSWORD__"] = Message; - Subst["__ADMIN__"] = ReplyTo; - Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read()); - - # Connect to the ldap server - l = ldap.open(LDAPServer); - 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 Error, "This account is locked"; - - # 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 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 is 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()) + + lc = 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 + lc.modify_s(Dn, Rec) + + return Reply + + +def HandleChTOTPSeed(Reply, DnRecord, Key): + # Generate a random seed + seed = binascii.hexlify(open("/dev/urandom", "r").read(32)) + random_id = binascii.hexlify(open("/dev/urandom", "r").read(32)) + totp_file_name = "%d-%s" % (time.time(), random_id,) + + msg = GPGEncrypt("Please go to %s/fetch-totp-seed.cgi?id=%s\n to fetch your TOTP seed" % (WebUILocation, totp_file_name), "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 += TemplateSubst(Subst, open(TemplatesDir + "totp-seed-changed", "r").read()) + + lc = connect_to_ldap_and_check_if_locked(DnRecord) + # Save the seed so the user can pick it up. + f = open(os.path.join(TOTPTicketDirectory, totp_file_name), os.O_WRONLY | os.O_CREAT) + print >> f, seed + print >> f, GetAttr(DnRecord, "uid") + f.close() + + # Modify the password + Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)] + Dn = "uid=" + GetAttr(DnRecord, "uid") + "," + BaseDn + lc.modify_s(Dn, Rec) + return Reply + + +def HandleChKrbPass(Reply, DnRecord, Key): + # Connect to the ldap server, will throw an exception if account locked. + lc = 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 is 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 += 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); +if not os.environ.get('SENDER'): + sys.exit(0) -ErrMsg = "Indeterminate Error"; -ErrType = EX_TEMPFAIL; +ErrMsg = "Indeterminate Error" +ErrType = EX_TEMPFAIL try: - # Startup the replay cache - ErrType = EX_TEMPFAIL; - ErrMsg = "Failed to initialize the replay cache:"; - RC = ReplayCache(ReplayCacheFile); - RC.Clean(); - - # Get the email - ErrType = EX_PERMFAIL; - ErrMsg = "Failed to understand the email or find a signature:"; - Email = mimetools.Message(sys.stdin,0); - Msg = GetClearSig(Email); - - ErrMsg = "Message is not PGP signed:" - if Msg[0].find("-----BEGIN PGP SIGNED MESSAGE-----") == -1 and \ - Msg[0].find("-----BEGIN PGP MESSAGE-----") == -1: - raise Error, "No PGP signature"; - - # Check the signature - ErrMsg = "Unable to check the signature or the signature was invalid:"; - Res = GPGCheckSig(Msg[0]); - - if Res[0] != None: - raise Error, Res[0]; - - if Res[3] == None: - raise Error, "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: - try: - Index = Res[3].index("\n\n") + 2; - except ValueError: - Index = Res[3].index("\n\r\n") + 3; - PlainText = Res[3][Index:]; - else: - PlainText = Res[3]; - - # Check the signature against the replay cache - ErrMsg = "The replay cache rejected your message. Check your clock!"; - Rply = RC.Check(Res[1]); - if Rply != None: - raise Error, Rply; - - # Connect to the ldap server - ErrType = EX_TEMPFAIL; - ErrMsg = "An error occured while performing the LDAP lookup"; - global l; - l = ldap.open(LDAPServer); - l.simple_bind_s("",""); - - # Search for the matching key fingerprint - Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + Res[2][1]); - - ErrType = EX_PERMFAIL; - if len(Attrs) == 0: - raise Error, "Key not found" - if len(Attrs) != 1: - raise Error, "Oddly your key fingerprint is assigned to more than one account.." - - RC.Add(Res[1]); - - # Determine the sender address - ErrMsg = "A problem occured while trying to formulate the reply"; - Sender = Email.getheader("Reply-To"); - if Sender == None: - Sender = Email.getheader("From"); - if Sender == None: - raise Error, "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); - - # Dispatch - if sys.argv[1] == "ping": - Reply = HandlePing(Reply,Attrs[0],Res[2]); - elif sys.argv[1] == "chpass": - if PlainText.strip().find("Please change my Debian password") != 0: - raise Error,"Please send a signed message where the first line of text is the string 'Please change my Debian password'"; - Reply = HandleChPass(Reply,Attrs[0],Res[2]); - elif sys.argv[1] == "change": - Reply = HandleChange(Reply,Attrs[0],Res[2]); - else: - print sys.argv; - raise Error, "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 Error, "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","w"); - Child.write(ErrReplyHead); - Child.write(ErrReply); - if Child.close() != None: - raise Error, "Sendmail gave a non-zero return code"; - except: - sys.exit(EX_TEMPFAIL); - - if ErrType != EX_PERMFAIL: - sys.exit(ErrType); - sys.exit(0); - + # 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 lc + lc = connectLDAP() + lc.simple_bind_s("", "") + + # Search for the matching key fingerprint + Attrs = lc.search_s(BaseDn, ldap.SCOPE_ONELEVEL, "keyFingerPrint={}".format(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.get('Reply-To', mail.get('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 = lc.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() is not None: + raise UDExecuteError("Sendmail gave a non-zero return code") + +except Exception: + # 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() is not None: + raise UDExecuteError("Sendmail gave a non-zero return code") + except Exception: + sys.exit(EX_TEMPFAIL) + + if ErrType != EX_PERMFAIL: + sys.exit(ErrType) + sys.exit(0) + +# vim:set et: +# vim:set ts=4: +# vim:set shiftwidth=4: