# Prior copyright probably rmurray, troup, joey, jgg -- weasel 2008
# Copyright (c) 2008 Peter Palfrader <peter@palfrader.org>
+# Copyright (c) 2008 Joerg Jaspert <joerg@debian.org>
-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
+from userdir_gpg import *
+from userdir_ldap import *
# Error codes from /usr/include/sysexits.h
ReplyTo = ConfModule.replyto;
ChPassFrom = ConfModule.chpassfrom;
ChangeFrom = ConfModule.changefrom;
ReplayCacheFile = ConfModule.replaycachefile;
+SSHFingerprintFile = ConfModule.fingerprintfile
EX_TEMPFAIL = 75;
EX_PERMFAIL = 65; # EX_DATAERR
SeenList = {}
DNS = {}
+SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$')
+SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+')
+
ArbChanges = {"c": "..",
"l": ".*",
"facsimileTelephoneNumber": ".*",
"mailDisableMessage": ".*",
"mailGreylisting": "^(TRUE|FALSE)$",
"mailCallout": "^(TRUE|FALSE)$",
+ "VoIP": ".*",
};
DelItems = {"c": None,
"mailRHSBL": None,
"mailWhitelist": None,
"mailDisableMessage": None,
+ "VoIP": None,
};
# Decode a GPS location from some common forms
Attrs.append((ldap.MOD_REPLACE,"longitude",sLong));
return "Position set to %s/%s (%s/%s decimal degrees)"%(sLat,sLong,Lat,Long);
+# Load bad ssh fingerprints
+def LoadBadSSH():
+ f = open(SSHFingerprintFile, "r")
+ bad = []
+ FingerprintLine = re.compile('^([0-9a-f\:]{47}).*$')
+ 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);
+ g = Match.groups()
+ typekey = g[1]
if Match == None:
- Match = re.compile('^1024 (\d+) ').match(Str)
+ 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));
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)
except:
Res = None;
Result = Result + "==> %s: %s\n" %(sys.exc_type,sys.exc_value);