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authorStefan Metzmacher <metze@samba.org>2010-12-23 08:17:48 +0100
committerStefan Metzmacher <metze@samba.org>2010-12-23 09:38:43 +0100
commite9dddc55e324c62973e6a561477b532cf9ed79af (patch)
tree0fc35eb4f3382a7ea68060eec01584fa0dfbcb87 /source3/libsmb
parent30d29e64cb5e0f1360ff47dd6d074d25fa86e5fd (diff)
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s3:libsmb: use 16 zero bytes as channel binding checksum in the gssapi checksum (bug #7883)
This fixes SMB session setups with kerberos against some closed source SMB servers. The new behavior matches heimdal and mit. metze Autobuild-User: Stefan Metzmacher <metze@samba.org> Autobuild-Date: Thu Dec 23 09:38:43 CET 2010 on sn-devel-104
Diffstat (limited to 'source3/libsmb')
-rw-r--r--source3/libsmb/clikrb5.c30
1 files changed, 10 insertions, 20 deletions
diff --git a/source3/libsmb/clikrb5.c b/source3/libsmb/clikrb5.c
index 5d51a5b19c..b4962a0203 100644
--- a/source3/libsmb/clikrb5.c
+++ b/source3/libsmb/clikrb5.c
@@ -704,26 +704,16 @@ static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
memset(gss_cksum, '\0', base_cksum_size + orig_length);
SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
- /* Precalculated MD5sum of NULL channel bindings (20 bytes) */
- /* Channel bindings are: (all ints encoded as little endian)
-
- [4 bytes] initiator_addrtype (255 for null bindings)
- [4 bytes] initiator_address length
- [n bytes] .. initiator_address data - not present
- in null bindings.
- [4 bytes] acceptor_addrtype (255 for null bindings)
- [4 bytes] acceptor_address length
- [n bytes] .. acceptor_address data - not present
- in null bindings.
- [4 bytes] application_data length
- [n bytes] .. application_ data - not present
- in null bindings.
- MD5 of this is ""\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18"
- */
-
- memcpy(&gss_cksum[4],
- "\x14\x8f\x0c\xf7\xb1u\xdey*J\x9a%\xdfV\xc5\x18",
- GSSAPI_BNDLENGTH);
+ /*
+ * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
+ * This matches the behavior of heimdal and mit.
+ *
+ * And it is needed to work against some closed source
+ * SMB servers.
+ *
+ * See bug #7883
+ */
+ memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
SIVAL(gss_cksum, 20, gss_flags);