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authorStefan Metzmacher <metze@samba.org>2010-01-08 13:07:33 -0700
committerGünther Deschner <gd@samba.org>2010-03-24 17:34:52 +0100
commitc64e6e0a0fd29fb462af90a2a0195280ef5e0696 (patch)
treed64dd16fe5452bc9c3236935ae6226fd4310ec23 /source4
parent3220c84b72212cb7619ecda60dd8a7c756742e3b (diff)
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s4:ntlmssp: inline ntlmssp_weakend_keys()
metze Signed-off-by: Günther Deschner <gd@samba.org>
Diffstat (limited to 'source4')
-rw-r--r--source4/auth/ntlmssp/ntlmssp.c41
-rw-r--r--source4/auth/ntlmssp/ntlmssp_sign.c54
2 files changed, 41 insertions, 54 deletions
diff --git a/source4/auth/ntlmssp/ntlmssp.c b/source4/auth/ntlmssp/ntlmssp.c
index 1866eb56b9..e55527a51d 100644
--- a/source4/auth/ntlmssp/ntlmssp.c
+++ b/source4/auth/ntlmssp/ntlmssp.c
@@ -310,47 +310,6 @@ void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
}
-/**
- Weaken NTLMSSP keys to cope with down-level clients and servers.
-
- We probably should have some parameters to control this, but as
- it only occours for LM_KEY connections, and this is controlled
- by the client lanman auth/lanman auth parameters, it isn't too bad.
-*/
-
-DATA_BLOB ntlmssp_weakend_key(struct ntlmssp_state *ntlmssp_state,
- TALLOC_CTX *mem_ctx)
-{
- DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
- ntlmssp_state->session_key.data,
- ntlmssp_state->session_key.length);
- /* Nothing to weaken. We certainly don't want to 'extend' the length... */
- if (weakened_key.length < 16) {
- /* perhaps there was no key? */
- return weakened_key;
- }
-
- /* Key weakening not performed on the master key for NTLM2
- and does not occour for NTLM1. Therefore we only need
- to do this for the LM_KEY.
- */
- if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
- /* LM key doesn't support 128 bit crypto, so this is
- * the best we can do. If you negotiate 128 bit, but
- * not 56, you end up with 40 bit... */
- if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
- weakened_key.data[7] = 0xa0;
- weakened_key.length = 8;
- } else { /* forty bits */
- weakened_key.data[5] = 0xe5;
- weakened_key.data[6] = 0x38;
- weakened_key.data[7] = 0xb0;
- weakened_key.length = 8;
- }
- }
- return weakened_key;
-}
-
static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
diff --git a/source4/auth/ntlmssp/ntlmssp_sign.c b/source4/auth/ntlmssp/ntlmssp_sign.c
index 285369dbb3..3b25db571e 100644
--- a/source4/auth/ntlmssp/ntlmssp_sign.c
+++ b/source4/auth/ntlmssp/ntlmssp_sign.c
@@ -347,20 +347,12 @@ NTSTATUS ntlmssp_unseal_packet(struct ntlmssp_state *ntlmssp_state,
/**
Initialise the state for NTLMSSP signing.
*/
-/* TODO: make this non-public */
NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state)
{
- TALLOC_CTX *mem_ctx = talloc_new(ntlmssp_state);
-
- if (!mem_ctx) {
- return NT_STATUS_NO_MEMORY;
- }
-
DEBUG(3, ("NTLMSSP Sign/Seal - Initialising with flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
if (ntlmssp_state->session_key.length < 8) {
- talloc_free(mem_ctx);
DEBUG(3, ("NO session key, cannot intialise signing\n"));
return NT_STATUS_NO_USER_SESSION_KEY;
}
@@ -389,7 +381,6 @@ NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state)
recv_seal_const = CLI_SEAL;
break;
default:
- talloc_free(mem_ctx);
return NT_STATUS_INTERNAL_ERROR;
}
@@ -468,23 +459,60 @@ NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state)
/* RECV: seq num */
ntlmssp_state->crypt.ntlm2.recv_seq_num = 0;
-
} else {
- DATA_BLOB weak_session_key = ntlmssp_weakend_key(ntlmssp_state, mem_ctx);
+ uint8_t weak_session_key[8];
+ DATA_BLOB seal_session_key = ntlmssp_state->session_key;
+ bool do_weak = false;
+
DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
+ /*
+ * Key weakening not performed on the master key for NTLM2
+ * and does not occour for NTLM1. Therefore we only need
+ * to do this for the LM_KEY.
+ */
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
+ do_weak = true;
+ }
+
+ /*
+ * Nothing to weaken.
+ * We certainly don't want to 'extend' the length...
+ */
+ if (seal_session_key.length < 16) {
+ /* TODO: is this really correct? */
+ do_weak = false;
+ }
+
+ if (do_weak) {
+ memcpy(weak_session_key, seal_session_key.data, 8);
+ seal_session_key = data_blob_const(weak_session_key, 8);
+
+ /*
+ * LM key doesn't support 128 bit crypto, so this is
+ * the best we can do. If you negotiate 128 bit, but
+ * not 56, you end up with 40 bit...
+ */
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
+ weak_session_key[7] = 0xa0;
+ } else { /* forty bits */
+ weak_session_key[5] = 0xe5;
+ weak_session_key[6] = 0x38;
+ weak_session_key[7] = 0xb0;
+ }
+ }
+
ntlmssp_state->crypt.ntlm.arcfour_state = talloc(ntlmssp_state, struct arcfour_state);
NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->crypt.ntlm.arcfour_state);
arcfour_init(ntlmssp_state->crypt.ntlm.arcfour_state,
- &weak_session_key);
+ &seal_session_key);
dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->crypt.ntlm.arcfour_state->sbox,
sizeof(ntlmssp_state->crypt.ntlm.arcfour_state->sbox));
ntlmssp_state->crypt.ntlm.seq_num = 0;
}
- talloc_free(mem_ctx);
return NT_STATUS_OK;
}