X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=ud-mailgate;h=6e94c75fadba29cc2f2826af9499871902cdfda0;hb=2525bf73603cb6487cfcea096e2dc347ad360394;hp=922a1bb76554f98373e92d796a500dbfcfff31d9;hpb=c50d88536a4feb3087d1aa802e110250cb2861fc;p=mirror%2Fuserdir-ldap.git diff --git a/ud-mailgate b/ud-mailgate index 922a1bb..6e94c75 100755 --- a/ud-mailgate +++ b/ud-mailgate @@ -1,6 +1,6 @@ #!/usr/bin/env python # -*- mode: python -*- -import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, posix; +import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os; import string, pwd from userdir_gpg import *; from userdir_ldap import *; @@ -9,19 +9,263 @@ from userdir_ldap import *; ReplyTo = ConfModule.replyto; PingFrom = ConfModule.pingfrom; ChPassFrom = ConfModule.chpassfrom; +ChangeFrom = ConfModule.changefrom; ReplayCacheFile = ConfModule.replaycachefile; EX_TEMPFAIL = 75; EX_PERMFAIL = 65; # EX_DATAERR Error = 'Message Error'; +SeenRSA = 0; +SeenDNS = 0; +ArbChanges = {"c": "..", + "l": ".*", + "facsimiletelephonenumber": ".*", + "telephonenumber": ".*", + "postaladdress": ".*", + "postalcode": ".*", + "loginshell": ".*", + "emailforward": "^([^<>@]+@.+)?$", + "ircnick": ".*", + "onvacation": ".*", + "labeledurl": ".*"}; + +DelItems = {"c": None, + "l": None, + "facsimiletelephonenumber": None, + "telephonenumber": None, + "postaladdress": None, + "postalcode": None, + "emailforward": None, + "ircnick": None, + "onvacation": None, + "labeledurl": None, + "latitude": None, + "longitude": None, + "sshrsaauthkey": None}; + +# Decode a GPS location from some common forms +def LocDecode(Str,Dir): + # Check for Decimal degrees, DGM, or DGMS + if re.match("^[+-]?[\d.]+$",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; + +# Handle changing a set of arbitary fields +# : value +def DoArbChange(Str,Attrs): + Match = re.match("^([^ :]+): (.*)$",Str); + if Match == None: + return None; + G = Match.groups(); + + if ArbChanges.has_key(G[0]) == 0: + return None; + + if re.match(ArbChanges[G[0]],G[1]) == None: + raise Error, "Item does not match the required format"+ArbChanges[G[0]]; + + Attrs.append((ldap.MOD_REPLACE,G[0],G[1])); + return "Changed entry %s to %s"%(G[0],G[1]); + +# Handle changing a set of arbitary fields +# : value +def DoDel(Str,Attrs): + Match = re.match("^del (.*)$",Str); + if Match == None: + return None; + G = Match.groups(); + + if DelItems.has_key(G[0]) == 0: + return "Cannot erase entry %s"%(G[0]); + + Attrs.append((ldap.MOD_DELETE,G[0],None)); + return "Removed entry %s"%(G[0]); + +# 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])?)$",string.lower(Str)); + if Match == None: + return None; + + G = Match.groups(); + try: + sLat = LocDecode(G[0],"ns"); + sLong = LocDecode(G[1],"ew"); + Lat = DecDegree(sLat,1); + Long = DecDegree(sLong,1); + except: + raise Error, "Positions were found, but they are not correctly formed"; + + Attrs.append((ldap.MOD_REPLACE,"latitude",sLat)); + Attrs.append((ldap.MOD_REPLACE,"longitude",sLong)); + return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long); + +# Handle a SSH RSA authentication key, the line format is: +# [options] 1024 35 13188913666680[..] [comment] +def DoSSH(Str,Attrs): + Match = SSHAuthSplit.match(Str); + if Match == None: + return None; + + global SeenRSA; + if SeenRSA: + Attrs.append((ldap.MOD_ADD,"sshrsaauthkey",Str)); + return "SSH Key added "+FormatSSHAuth(Str); + + Attrs.append((ldap.MOD_REPLACE,"sshrsaauthkey",Str)); + SeenRSA = 1; + return "SSH Keys replaced with "+FormatSSHAuth(Str); + +# Handle changing a dns entry +# host in a 12.12.12.12 +# host in cname foo.bar. <- Trailing dot is required +def DoDNS(Str,Attrs,DnRecord): + if re.match('^[\w-]+\s+in\s+a\s+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$',\ + Str,re.IGNORECASE) == None and \ + re.match("^[\w-]+\s+in\s+cname\s+[\w.\-]+\.$",Str,re.IGNORECASE) == None: + return None; + + # Check if the name is already taken + G = re.match('^([\w-+]+)\s',Str).groups(); + + # Check for collisions + global l; + Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"dnszoneentry="+G[0]+" *",["uid"]); + for x in Rec: + if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"): + return "DNS entry is already owned by " + GetAttr(x,"uid") + + global SeenDNS; + if SeenDNS: + Attrs.append((ldap.MOD_ADD,"dnszoneentry",Str)); + return "DNS Entry added "+Str; + + Attrs.append((ldap.MOD_REPLACE,"dnszoneentry",Str)); + SeenDNS = 1; + return "DNS Entry replaced with "+Str; + +# Handle an [almost] arbitary change +def HandleChange(Reply,DnRecord,Key): + global PlainText; + Lines = string.split(PlainText,"\r\n"); + + Result = ""; + Attrs = []; + Show = 0; + for Line in Lines: + Line = string.strip(Line); + if Line == "": + continue; + + # Try to process a command line + Result = Result + "> "+Line+"\n"; + try: + if Line == "show": + Show = 1; + Res = "OK"; + else: + Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \ + DoArbChange(Line,Attrs) or DoSSH(Line,Attrs) or \ + DoDel(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 = string.split(string.strip(F.readline())," "); + F.close(); + + # Modify the record + l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]); + 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()); + # 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(Attrs[0]); + Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord); Subst["__ADMIN__"] = ReplyTo; return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read()); @@ -57,19 +301,29 @@ def HandleChPass(Reply,DnRecord,Key): # Connect to the ldap server l = ldap.open(LDAPServer); - F = open(PassDir+"/pass-"+pwd.getpwuid(posix.getuid())[0],"r"); + F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r"); AccessPass = string.split(string.strip(F.readline())," "); 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 (string.find(GetAttr(Attrs[0],"userPassword"),"*LK*") != -1): + raise Error, "This account is locked"; # Modify the password - l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]); Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass)]; Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn; l.modify_s(Dn,Rec); - + 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: @@ -85,7 +339,11 @@ try: Email = mimetools.Message(sys.stdin,0); Msg = GetClearSig(Email); - # Check the signature + ErrMsg = "Message is not PGP signed:" + if string.find(Msg[0],"-----BEGIN PGP SIGNED 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]); @@ -96,6 +354,7 @@ try: 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: @@ -116,6 +375,7 @@ try: # 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("",""); @@ -135,6 +395,9 @@ try: if Sender == None: raise Error, "Unable to determine the sender's address"; + if (string.find(GetAttr(Attrs[0],"userPassword"),"*LK*") != -1): + raise Error, "This account is locked"; + # 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); @@ -146,25 +409,52 @@ try: if string.find(string.strip(PlainText),"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 = posix.popen("/usr/sbin/sendmail -t","w"); -# Child = posix.popen("cat","w"); + 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: - print ErrMsg; - print "==> %s: %s" %(sys.exc_type,sys.exc_value); + # 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: - print "Trace: "; + Trace = Trace + "Python Stack Trace:\n"; for x in List: - print " %s %s:%u: %s" %(x[2],x[0],x[1],x[3]); - sys.exit(ErrType); + 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);