X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=ud-mailgate;h=29a2873097c4743a2f29cf957de50cc7ba458dfa;hb=adad9e118b6dd523870eb3491e709b4dea204058;hp=6b8cd38abe3b94b33c5add53724029967174cca3;hpb=1ad811a8aae34d70d0450525f941a053c76ba6b8;p=mirror%2Fuserdir-ldap.git diff --git a/ud-mailgate b/ud-mailgate index 6b8cd38..29a2873 100755 --- a/ud-mailgate +++ b/ud-mailgate @@ -3,11 +3,15 @@ # Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008 # Copyright (c) 2008 Peter Palfrader +# Copyright (c) 2008 Joerg Jaspert -import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os; -import pwd -from userdir_gpg import *; -from userdir_ldap import *; +import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands +import pwd, tempfile +import hmac +import sha as sha1_module + +from userdir_gpg import * +from userdir_ldap import * # Error codes from /usr/include/sysexits.h ReplyTo = ConfModule.replyto; @@ -15,6 +19,9 @@ 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 @@ -26,6 +33,18 @@ mailRHSBL = {} mailWhitelist = {} SeenList = {} DNS = {} +SudoPasswd = {} + +SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$') +SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+') + +GenderTable = {"male": 1, + "1": 1, + "female": 2, + "2": 2, + "unspecified": 9, + "9": 9, +}; ArbChanges = {"c": "..", "l": ".*", @@ -44,6 +63,8 @@ ArbChanges = {"c": "..", "mailDisableMessage": ".*", "mailGreylisting": "^(TRUE|FALSE)$", "mailCallout": "^(TRUE|FALSE)$", + "VoIP": ".*", + "gender": "^(1|2|9|male|female|unspecified)$", }; DelItems = {"c": None, @@ -71,8 +92,18 @@ DelItems = {"c": None, "mailRHSBL": None, "mailWhitelist": None, "mailDisableMessage": None, + "VoIP": None, }; +def make_hmac(str): + F = open(PassDir+"/key-hmac","r"); + key = F.readline().strip() + F.close(); + + return hmac.new(key, str, sha1_module).hexdigest + + + # Decode a GPS location from some common forms def LocDecode(Str,Dir): # Check for Decimal degrees, DGM, or DGMS @@ -151,6 +182,12 @@ def DoArbChange(Str,Attrs): if re.match(ArbChanges[attrName],G[1]) == None: raise Error, "Item does not match the required format"+ArbChanges[attrName]; + value = G[1]; + if attrName == 'gender': + if G[1] not in GenderTable: + raise Error, "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 = $3; @@ -174,8 +211,8 @@ def DoArbChange(Str,Attrs): # } elsif (not defined($query->param('birthdate')) or $query->param('birthdate') =~ /^\s*$/) { # $bd_ok = 1; # } - Attrs.append((ldap.MOD_REPLACE,attrName,G[1])); - return "Changed entry %s to %s"%(attrName,G[1]); + Attrs.append((ldap.MOD_REPLACE,attrName,value)); + return "Changed entry %s to %s"%(attrName,value); # Handle changing a set of arbitary fields # : value @@ -216,16 +253,89 @@ def DoPosition(Str,Attrs): Attrs.append((ldap.MOD_REPLACE,"longitude",sLong)); return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long); +# Load bad ssh fingerprints +def LoadBadSSH(): + f = open(SSHFingerprintFile, "r") + bad = [] + FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$') + 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] -def DoSSH(Str,Attrs): +def DoSSH(Str, Attrs, badkeys, uid): Match = SSH2AuthSplit.match(Str); if Match == None: - Match = re.compile('^1024 (\d+) ').match(Str) + return None; + g = Match.groups() + typekey = g[1] + if Match == None: + Match = SSHRSA1Match.match(Str) if Match is not None: - return "SSH1 keys not supported anymore" + 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)); @@ -351,6 +461,71 @@ def DoRBL(Str,Attrs): SeenList[Key] = 1; return "%s replaced with %s" % (Key,Host) +# Handle a ConfirmSudoPassword request +def DoConfirmSudopassword(Str): + Match = re.compile('^confirm sudopassword ('+UUID_FORMAT+') ([a-z0-9,*]+) ([0-9a-f]{40})$').match(Str.lower()) + if Match == None: + return None + + uuid = Match.group(1) + hosts = Match.group(2) + hmac = Match.group(3) + + global SudoPasswd + SudoPasswd[uuid] = (hosts, hmac) + return "got confirm for sudo password %s on host(s) %s, auth code %s" % (uuid,hosts, hmac) + +def FinishConfirmSudopassword(l, uid, Attrs): + global SudoPasswd + result = "\n" + + res = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid="+uid, ['sudoPassword']); + if len(res) != 1: + raise Error, "Not exactly one hit when searching for user" + Attrs = res[0][1] + if Attrs.has_key('sudoPassword'): + inldap = Attrs['sudoPassword'] + else: + inldap = [] + + newldap = [] + for entry in inldap: + Match = re.compile('^('+UUID_FORMAT+') (confirmed|unconfirmed) ([a-z0-9,*]+) ([^ ]+)$'),match(entry.lower()) + if Match == None: + raise Error, "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 == "confirmed": + result = result + "Entry %s for sudo password on hosts %s already confirmed.\n"%(uuid, hosts) + elif confirmedHosts != hosts: + result = result + "Entry %s hostlist mismatch (%s vs. %s).\n"%(uuid, hosts, confirmedHosts) + elif make_hmac(':'.join([uuid, hosts, cryptedpass])) == confirmedHmac: + result = result + "Entry %s for sudo password on hosts %s now confirmed.\n"%(uuid, hosts) + status = 'confirmed' + 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_ADD,"sudoPassword",newentry)) + else: + newldap.append((ldap.MOD_REPLACE,"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 + # Handle an [almost] arbitary change def HandleChange(Reply,DnRecord,Key): global PlainText; @@ -359,6 +534,7 @@ def HandleChange(Reply,DnRecord,Key): Result = ""; Attrs = []; Show = 0; + CommitChanges = 1 for Line in Lines: Line = Line.strip() if Line == "": @@ -368,37 +544,46 @@ def HandleChange(Reply,DnRecord,Key): Result = Result + "> "+Line+"\n"; try: if Line == "show": - Show = 1; - Res = "OK"; + 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) or DoRBL(Line,Attrs); + 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) 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"; + CommitChanges = 0 + Result = Result + "Command is not understood. Halted - no changes committed\n"; break; Result = Result + Res + "\n"; # Connect to the ldap server - l = ldap.open(LDAPServer); + l = connectLDAP() 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"; + try: + Res = FinishConfirmSudopassword(l, GetAttr(DnRecord,"uid"), Attrs) + Result = Result + Res + "\n"; + except Error, e: + CommitChanges = 0 + Result = Result + "FinishConfirmSudopassword raised an error (%s) - no changes committed\n"%(e); + # Modify the record Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn; - l.modify_s(Dn,Attrs); + if CommitChanges == 1: + l.modify_s(Dn,Attrs); Attribs = ""; if Show == 1: @@ -457,7 +642,7 @@ def HandleChPass(Reply,DnRecord,Key): Reply = Reply + TemplateSubst(Subst,open(TemplatesDir+"passwd-changed","r").read()); # Connect to the ldap server - l = ldap.open(LDAPServer); + l = connectLDAP() F = open(PassDir+"/pass-"+pwd.getpwuid(os.getuid())[0],"r"); AccessPass = F.readline().strip().split(" ") F.close(); @@ -470,7 +655,8 @@ def HandleChPass(Reply,DnRecord,Key): raise Error, "This account is locked"; # Modify the password - Rec = [(ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass)]; + 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); @@ -534,7 +720,7 @@ try: ErrType = EX_TEMPFAIL; ErrMsg = "An error occured while performing the LDAP lookup"; global l; - l = ldap.open(LDAPServer); + l = connectLDAP() l.simple_bind_s("",""); # Search for the matching key fingerprint