3 import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os;
5 from userdir_gpg import *;
6 from userdir_ldap import *;
8 # Error codes from /usr/include/sysexits.h
9 ReplyTo = ConfModule.replyto;
10 PingFrom = ConfModule.pingfrom;
11 ChPassFrom = ConfModule.chpassfrom;
12 ChangeFrom = ConfModule.changefrom;
13 ReplayCacheFile = ConfModule.replaycachefile;
16 EX_PERMFAIL = 65; # EX_DATAERR
17 Error = 'Message Error';
22 ArbChanges = {"c": "..",
24 "facsimiletelephonenumber": ".*",
25 "telephonenumber": ".*",
26 "postaladdress": ".*",
29 "emailforward": "^([^<>@]+@.+)?$",
35 DelItems = {"c": None,
37 "facsimiletelephonenumber": None,
38 "telephonenumber": None,
39 "postaladdress": None,
48 "sshrsaauthkey": None,
49 "sshdsaauthkey": None};
51 # Decode a GPS location from some common forms
52 def LocDecode(Str,Dir):
53 # Check for Decimal degrees, DGM, or DGMS
54 if re.match("^[+-]?[\d.]+$",Str) != None:
57 Deg = '0'; Min = None; Sec = None; Dr = Dir[0];
59 # Check for DDDxMM.MMMM where x = [nsew]
60 Match = re.match("^(\d+)(["+Dir+"])([\d.]+)$",Str);
63 Deg = G[0]; Min = G[2]; Dr = G[1];
66 Match = re.match("^([\d.]+) ?(["+Dir+"])$",Str);
69 Deg = G[0]; Dr = G[1];
71 # Check for DD:MM.MM x
72 Match = re.match("^(\d+):([\d.]+) ?(["+Dir+"])$",Str);
75 Deg = G[0]; Min = G[1]; Dr = G[2];
77 # Check for DD:MM:SS.SS x
78 Match = re.match("^(\d+):(\d+):([\d.]+) ?(["+Dir+"])$",Str);
81 Deg = G[0]; Min = G[1]; Sec = G[2]; Dr = G[3];
85 raise "Failed","Bad degrees";
86 if Min != None and float(Min) > 60:
87 raise "Failed","Bad minutes";
88 if Sec != None and float(Sec) > 60:
89 raise "Failed","Bad seconds";
91 # Pad on an extra leading 0 to disambiguate small numbers
92 if len(Deg) <= 1 or Deg[1] == '.':
94 if Min != None and (len(Min) <= 1 or Min[1] == '.'):
96 if Sec != None and (len(Sec) <= 1 or Sec[1] == '.'):
99 # Construct a DGM/DGMS type value from the components.
110 # Handle changing a set of arbitary fields
112 def DoArbChange(Str,Attrs):
113 Match = re.match("^([^ :]+): (.*)$",Str);
118 if ArbChanges.has_key(G[0]) == 0:
121 if re.match(ArbChanges[G[0]],G[1]) == None:
122 raise Error, "Item does not match the required format"+ArbChanges[G[0]];
124 Attrs.append((ldap.MOD_REPLACE,G[0],G[1]));
125 return "Changed entry %s to %s"%(G[0],G[1]);
127 # Handle changing a set of arbitary fields
129 def DoDel(Str,Attrs):
130 Match = re.match("^del (.*)$",Str);
135 if DelItems.has_key(G[0]) == 0:
136 return "Cannot erase entry %s"%(G[0]);
138 Attrs.append((ldap.MOD_DELETE,G[0],None));
139 return "Removed entry %s"%(G[0]);
141 # Handle a position change message, the line format is:
142 # Lat: -12412.23 Long: +12341.2342
143 def DoPosition(Str,Attrs):
144 Match = re.match("^lat: ([+\-]?[\d:.ns]+(?: ?[ns])?) long: ([+\-]?[\d:.ew]+(?: ?[ew])?)$",string.lower(Str));
150 sLat = LocDecode(G[0],"ns");
151 sLong = LocDecode(G[1],"ew");
152 Lat = DecDegree(sLat,1);
153 Long = DecDegree(sLong,1);
155 raise Error, "Positions were found, but they are not correctly formed";
157 Attrs.append((ldap.MOD_REPLACE,"latitude",sLat));
158 Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
159 return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long);
161 # Handle an SSH authentication key, the line format is:
162 # [options] 1024 35 13188913666680[..] [comment]
163 def DoSSH(Str,Attrs):
164 Match = SSHAuthSplit.match(Str);
166 Match = SSH2AuthSplit.match(Str);
172 Attrs.append((ldap.MOD_ADD,"sshrsaauthkey",Str));
173 return "SSH Key added "+FormatSSHAuth(Str);
175 Attrs.append((ldap.MOD_REPLACE,"sshrsaauthkey",Str));
177 return "SSH Keys replaced with "+FormatSSHAuth(Str);
179 # Handle changing a dns entry
180 # host in a 12.12.12.12
181 # host in cname foo.bar. <- Trailing dot is required
182 def DoDNS(Str,Attrs,DnRecord):
183 cname = re.match("^[-\w]+\s+in\s+cname\s+[-\w.]+\.$",Str,re.IGNORECASE);
184 if re.match('^[-\w]+\s+in\s+a\s+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$',\
185 Str,re.IGNORECASE) == None and cname == None and \
186 re.match("^[-\w]+\s+in\s+mx\s+\d{1,3}\s+[-\w.]+\.$",Str,re.IGNORECASE) == None:
189 # Check if the name is already taken
190 G = re.match('^([-\w+]+)\s',Str).groups();
192 # Check for collisions
194 Rec = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"dnszoneentry="+G[0]+" *",["uid"]);
196 if GetAttr(x,"uid") != GetAttr(DnRecord,"uid"):
197 return "DNS entry is already owned by " + GetAttr(x,"uid")
203 if DNS.has_key(G[0]):
204 return "CNAME and other RR types not allowed: "+Str
208 if DNS.has_key(G[0]) and DNS[G[0]] == 2:
209 return "CNAME and other RR types not allowed: "+Str
214 Attrs.append((ldap.MOD_ADD,"dnszoneentry",Str));
215 return "DNS Entry added "+Str;
217 Attrs.append((ldap.MOD_REPLACE,"dnszoneentry",Str));
219 return "DNS Entry replaced with "+Str;
221 # Handle an [almost] arbitary change
222 def HandleChange(Reply,DnRecord,Key):
224 Lines = re.split("\n *\r?",PlainText);
230 Line = string.strip(Line);
234 # Try to process a command line
235 Result = Result + "> "+Line+"\n";
241 Res = DoPosition(Line,Attrs) or DoDNS(Line,Attrs,DnRecord) or \
242 DoArbChange(Line,Attrs) or DoSSH(Line,Attrs) or \
246 Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
248 # Fail, if someone tries to send someone elses signed email to the
249 # daemon then we want to abort ASAP.
251 Result = Result + "Command is not understood. Halted\n";
253 Result = Result + Res + "\n";
255 # Connect to the ldap server
256 l = ldap.open(LDAPServer);
257 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
258 AccessPass = string.split(string.strip(F.readline())," ");
262 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
263 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
264 l.modify_s(Dn,Attrs);
268 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
270 raise Error, "User not found"
271 Attribs = GPGEncrypt(PrettyShow(Attrs[0])+"\n","0x"+Key[1],Key[4]);
274 Subst["__FROM__"] = ChangeFrom;
275 Subst["__EMAIL__"] = EmailAddress(DnRecord);
276 Subst["__ADMIN__"] = ReplyTo;
277 Subst["__RESULT__"] = Result;
278 Subst["__ATTR__"] = Attribs;
280 return Reply + TemplateSubst(Subst,open(TemplatesDir+"change-reply","r").read());
282 # Handle ping handles an email sent to the 'ping' address (ie this program
283 # called with a ping argument) It replies with a dump of the public records.
284 def HandlePing(Reply,DnRecord,Key):
286 Subst["__FROM__"] = PingFrom;
287 Subst["__EMAIL__"] = EmailAddress(DnRecord);
288 Subst["__LDAPFIELDS__"] = PrettyShow(DnRecord);
289 Subst["__ADMIN__"] = ReplyTo;
291 return Reply + TemplateSubst(Subst,open(TemplatesDir+"ping-reply","r").read());
293 # Handle a change password email sent to the change password address
294 # (this program called with the chpass argument)
295 def HandleChPass(Reply,DnRecord,Key):
296 # Generate a random password
297 Password = GenPass();
298 Pass = HashPass(Password);
300 # Use GPG to encrypt it
301 Message = GPGEncrypt("Your new password is '" + Password + "'\n",\
306 raise Error, "Unable to generate the encrypted reply, gpg failed.";
309 Type = "Your message was encrypted using PGP 2.x\ncompatibility mode.";
311 Type = "Your message was encrypted using GPG (OpenPGP)\ncompatibility "\
312 "mode, without IDEA. This message cannot be decoded using PGP 2.x";
315 Subst["__FROM__"] = ChPassFrom;
316 Subst["__EMAIL__"] = EmailAddress(DnRecord);
317 Subst["__CRYPTTYPE__"] = Type;
318 Subst["__PASSWORD__"] = Message;
319 Subst["__ADMIN__"] = ReplyTo;
320 Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read());
322 # Connect to the ldap server
323 l = ldap.open(LDAPServer);
324 F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r");
325 AccessPass = string.split(string.strip(F.readline())," ");
327 l.simple_bind_s("uid="+AccessPass[0]+","+BaseDn,AccessPass[1]);
329 # Check for a locked account
330 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+GetAttr(DnRecord,"uid"));
331 if (string.find(GetAttr(Attrs[0],"userpassword"),"*LK*") != -1):
332 raise Error, "This account is locked";
334 # Modify the password
335 Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass)];
336 Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn;
341 # Start of main program
343 # Drop messages from a mailer daemon.
344 if os.environ.has_key('SENDER') == 0 or len(os.environ['SENDER']) == 0:
347 ErrMsg = "Indeterminate Error";
348 ErrType = EX_TEMPFAIL;
350 # Startup the replay cache
351 ErrType = EX_TEMPFAIL;
352 ErrMsg = "Failed to initialize the replay cache:";
353 RC = ReplayCache(ReplayCacheFile);
357 ErrType = EX_PERMFAIL;
358 ErrMsg = "Failed to understand the email or find a signature:";
359 Email = mimetools.Message(sys.stdin,0);
360 Msg = GetClearSig(Email);
362 ErrMsg = "Message is not PGP signed:"
363 if string.find(Msg[0],"-----BEGIN PGP SIGNED MESSAGE-----") == -1:
364 raise Error, "No PGP signature";
366 # Check the signature
367 ErrMsg = "Unable to check the signature or the signature was invalid:";
368 Res = GPGCheckSig(Msg[0]);
374 raise Error, "Null signature text";
376 # Extract the plain message text in the event of mime encoding
378 ErrMsg = "Problem stripping MIME headers from the decoded message"
381 Index = string.index(Res[3],"\n\n") + 2;
383 Index = string.index(Res[3],"\n\r\n") + 3;
384 PlainText = Res[3][Index:];
388 # Check the signature against the replay cache
389 ErrMsg = "The replay cache rejected your message. Check your clock!";
390 Rply = RC.Check(Res[1]);
395 # Connect to the ldap server
396 ErrType = EX_TEMPFAIL;
397 ErrMsg = "An error occured while performing the LDAP lookup";
399 l = ldap.open(LDAPServer);
400 l.simple_bind_s("","");
402 # Search for the matching key fingerprint
403 Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyfingerprint=" + Res[2][1]);
405 raise Error, "Key not found"
407 raise Error, "Oddly your key fingerprint is assigned to more than one account.."
409 # Determine the sender address
410 ErrType = EX_PERMFAIL;
411 ErrMsg = "A problem occured while trying to formulate the reply";
412 Sender = Email.getheader("Reply-To");
414 Sender = Email.getheader("From");
416 raise Error, "Unable to determine the sender's address";
418 if (string.find(GetAttr(Attrs[0],"userpassword"),"*LK*") != -1):
419 raise Error, "This account is locked";
422 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
423 Reply = "To: %s\nReply-To: %s\nDate: %s\n" % (Sender,ReplyTo,Date);
426 if sys.argv[1] == "ping":
427 Reply = HandlePing(Reply,Attrs[0],Res[2]);
428 elif sys.argv[1] == "chpass":
429 if string.find(string.strip(PlainText),"Please change my Debian password") != 0:
430 raise Error,"Please send a signed message where the first line of text is the string 'Please change my Debian password'";
431 Reply = HandleChPass(Reply,Attrs[0],Res[2]);
432 elif sys.argv[1] == "change":
433 Reply = HandleChange(Reply,Attrs[0],Res[2]);
436 raise Error, "Incorrect Invokation";
438 # Send the message through sendmail
439 ErrMsg = "A problem occured while trying to send the reply";
440 Child = os.popen("/usr/sbin/sendmail -t","w");
441 # Child = os.popen("cat","w");
443 if Child.close() != None:
444 raise Error, "Sendmail gave a non-zero return code";
448 Date = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
449 ErrReplyHead = "To: %s\nReply-To: %s\nDate: %s\n" % (os.environ['SENDER'],ReplyTo,Date);
453 Subst["__ERROR__"] = ErrMsg;
454 Subst["__ADMIN__"] = ReplyTo;
456 Trace = "==> %s: %s\n" %(sys.exc_type,sys.exc_value);
457 List = traceback.extract_tb(sys.exc_traceback);
459 Trace = Trace + "Python Stack Trace:\n";
461 Trace = Trace + " %s %s:%u: %s\n" %(x[2],x[0],x[1],x[3]);
463 Subst["__TRACE__"] = Trace;
465 # Try to send the bounce
467 ErrReply = TemplateSubst(Subst,open(TemplatesDir+"error-reply","r").read());
469 Child = os.popen("/usr/sbin/sendmail -t","w");
470 Child.write(ErrReplyHead);
471 Child.write(ErrReply);
472 if Child.close() != None:
473 raise Error, "Sendmail gave a non-zero return code";
475 sys.exit(EX_TEMPFAIL);
477 if ErrType != EX_PERMFAIL: