release 0.3.92

[mirror/userdir-ldap.git] / ud-mailgate

diff --git a/ud-mailgate b/ud-mailgate
index 6f9b20c..e6b54a9 100755 (executable)
--- a/ud-mailgate
+++ b/ud-mailgate
@@ -11,6 +11,7 @@ import userdir_gpg, userdir_ldap, sys, traceback, time, ldap, os, commands
 import pwd, tempfile
 import subprocess
 import email, email.parser
+import binascii
 
 from userdir_gpg import *
 from userdir_ldap import *
@@ -38,7 +39,7 @@ SeenList = {}
 DNS = {}
 ValidHostNames = [] # will be initialized in later
 
-SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}) (.+)$')
+SSHFingerprint = re.compile('^(\d+) ([0-9a-f\:]{47}|SHA256:[0-9A-Za-z/+]{43}) (.+)$')
 SSHRSA1Match = re.compile('^^(.* )?\d+ \d+ \d+')
 
 GenderTable = {"male": '1',
@@ -321,25 +322,22 @@ def DoSSH(Str, Attrs, badkeys, uid):
    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 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 UDExecuteError, "Sendmail gave a non-zero return code"
-      except:
-         sys.exit(EX_TEMPFAIL)
+   if typekey == "rsa":
+      key_size_ok = (int(key_size) >= 2048)
+   elif typekey == "ed25519":
+     key_size_ok = True
+   else:
+     key_size_ok = False
 
-      # And now break and stop processing input, which sends a reply to the user.
-      raise UDFormatError, "SSH keys must have at least 1024 bits, processing halted, NOTHING MODIFIED AT ALL"
-   elif g[1] in badkeys:
+   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])
@@ -356,17 +354,14 @@ def DoSSH(Str, Attrs, badkeys, uid):
       # 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"
 
-   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);
-      
+     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 "+FormatSSHAuth(Str);
+   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
@@ -377,7 +372,7 @@ 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.]+\.)$",Str,re.IGNORECASE)
-   txtrecord   = re.match("^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@]+)", Str, re.IGNORECASE)
+   txtrecord   = re.match("^[-\w]+\s+IN\s+TXT\s+([-\d. a-z\t<>@:]+)", Str, re.IGNORECASE)
    #aaaarecord  = re.match('^[-\w]+\s+IN\s+AAAA\s+((?:[0-9a-f]{1,4})(?::[0-9a-f]{1,4})*(?::(?:(?::[0-9a-f]{1,4})*|:))?)$',Str,re.IGNORECASE)
    aaaarecord  = re.match('^[-\w]+\s+IN\s+AAAA\s+([A-F0-9:]{2,39})$',Str,re.IGNORECASE)
 
@@ -695,6 +690,28 @@ def HandleChPass(Reply,DnRecord,Key):
 
    return Reply;
 
+def HandleChTOTPSeed(Reply, DnRecord, Key):
+   # Generate a random seed
+   seed = binascii.hexlify(open("/dev/urandom", "r").read(32))
+   msg = GPGEncrypt("Your new TOTP seed is '%s'\n" % (seed,), "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 = Reply + TemplateSubst(Subst, open(TemplatesDir+"totp-seed-changed", "r").read())
+
+   l = connect_to_ldap_and_check_if_locked(DnRecord)
+   # Modify the password
+   Rec = [(ldap.MOD_REPLACE, "totpSeed", seed)]
+   Dn = "uid=" + GetAttr(DnRecord,"uid") + "," + BaseDn
+   l.modify_s(Dn,Rec)
+   return Reply;
+
 def HandleChKrbPass(Reply,DnRecord,Key):
    # Connect to the ldap server, will throw an exception if account locked.
    l = connect_to_ldap_and_check_if_locked(DnRecord)
@@ -822,6 +839,8 @@ try:
          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":