Correct fix for #7092

ticket: 7092

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@25706 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/lib/krb5/asn.1/asn1_k_encode.c b/src/lib/krb5/asn.1/asn1_k_encode.c
index 5ed17528b3ad933321716daf8494d7781ed69e97..35667ffa5524ad072aced0f0d3ea92e850c8148c 100644 (file)
--- a/src/lib/krb5/asn.1/asn1_k_encode.c
+++ b/src/lib/krb5/asn.1/asn1_k_encode.c
@@ -173,8 +173,20 @@ DEFNULLTERMSEQOFTYPE(seqof_host_addresses, address_ptr);
 DEFPTRTYPE(ptr_seqof_host_addresses, seqof_host_addresses);
 DEFOPTIONALEMPTYTYPE(opt_ptr_seqof_host_addresses, ptr_seqof_host_addresses);
 
+/*
+ * krb5_kvno is defined as unsigned int, but historically (MIT krb5 through 1.6
+ * in the encoder, and through 1.10 in the decoder) we treat it as signed, in
+ * violation of RFC 4120.  kvno values large enough to be problematic are only
+ * likely to be seen with Windows read-only domain controllers, which overload
+ * the high 16-bits of kvno values for krbtgt principals.  Since Windows
+ * encodes kvnos as signed 32-bit values, for interoperability it's best if we
+ * do the same.
+ */
+DEFINTTYPE(kvno, krb5_kvno);
+DEFOPTIONALZEROTYPE(opt_kvno, kvno);
+
 DEFFIELD(enc_data_0, krb5_enc_data, enctype, 0, int32);
-DEFFIELD(enc_data_1, krb5_enc_data, kvno, 1, opt_uint);
+DEFFIELD(enc_data_1, krb5_enc_data, kvno, 1, opt_kvno);
 DEFFIELD(enc_data_2, krb5_enc_data, ciphertext, 2, ostring_data);
 static const struct atype_info *encrypted_data_fields[] = {
     &k5_atype_enc_data_0, &k5_atype_enc_data_1, &k5_atype_enc_data_2