diff options
| -rw-r--r-- | src/lib/krb5/krb/gc_via_tkt.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/lib/krb5/krb/gc_via_tkt.c b/src/lib/krb5/krb/gc_via_tkt.c index 059da828a..e8dbd97fe 100644 --- a/src/lib/krb5/krb/gc_via_tkt.c +++ b/src/lib/krb5/krb/gc_via_tkt.c @@ -144,6 +144,16 @@ check_reply_server(krb5_context context, krb5_flags kdcoptions, return 0; } +/* Return true if a TGS credential is for the client's local realm. */ +static inline int +tgt_is_local_realm(krb5_creds *tgt) +{ + return (tgt->server->length == 2 + && data_eq_string(tgt->server->data[0], KRB5_TGS_NAME) + && data_eq(tgt->server->data[1], tgt->client->realm) + && data_eq(tgt->server->realm, tgt->client->realm)); +} + krb5_error_code krb5_get_cred_via_tkt (krb5_context context, krb5_creds *tkt, krb5_flags kdcoptions, krb5_address *const *address, @@ -289,6 +299,14 @@ krb5_get_cred_via_tkt (krb5_context context, krb5_creds *tkt, goto error_3; } + /* + * Don't trust the ok-as-delegate flag from foreign KDCs unless the + * cross-realm TGT also had the ok-as-delegate flag set. + */ + if (!tgt_is_local_realm(tkt) + && !(tkt->ticket_flags & TKT_FLG_OK_AS_DELEGATE)) + dec_rep->enc_part2->flags &= ~TKT_FLG_OK_AS_DELEGATE; + /* make sure the response hasn't been tampered with..... */ retval = 0; |