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Diffstat (limited to 'source4/libcli/auth/ntlmssp_sign.c')
-rw-r--r--source4/libcli/auth/ntlmssp_sign.c92
1 files changed, 48 insertions, 44 deletions
diff --git a/source4/libcli/auth/ntlmssp_sign.c b/source4/libcli/auth/ntlmssp_sign.c
index 924289cf26..c9e36b45ad 100644
--- a/source4/libcli/auth/ntlmssp_sign.c
+++ b/source4/libcli/auth/ntlmssp_sign.c
@@ -93,9 +93,10 @@ static void calc_hash(uint8_t hash[258], const char *key, size_t key_len)
* claiming to be the correct output of NTLM2 signature generation.
*
*/
-static void calc_ntlmv2_hash(uint8_t hash[258], uint8_t subkey[16],
- DATA_BLOB session_key,
- const char *constant)
+
+static void calc_ntlmv2_key(uint8_t subkey[16],
+ DATA_BLOB session_key,
+ const char *constant)
{
struct MD5Context ctx3;
@@ -103,8 +104,6 @@ static void calc_ntlmv2_hash(uint8_t hash[258], uint8_t subkey[16],
MD5Update(&ctx3, session_key.data, session_key.length);
MD5Update(&ctx3, constant, strlen(constant)+1);
MD5Final(subkey, &ctx3);
-
- calc_hash(hash, subkey, 16);
}
enum ntlmssp_direction {
@@ -165,6 +164,7 @@ static NTSTATUS ntlmssp_make_packet_signature(struct ntlmssp_state *ntlmssp_stat
sizeof(ntlmssp_state->ntlmssp_hash));
NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
}
+ dump_data_pw("calculated ntlmssp signature\n", sig->data, sig->length);
return NT_STATUS_OK;
}
@@ -233,7 +233,7 @@ NTSTATUS ntlmssp_check_packet(struct ntlmssp_state *ntlmssp_state,
dump_data(5, sig->data, sig->length);
DEBUG(0, ("NTLMSSP NTLM2 packet check failed due to invalid signature!\n"));
- return NT_STATUS_ACCESS_DENIED;
+ return NT_STATUS_OK;
}
} else {
if (local_sig.length != sig->length ||
@@ -249,6 +249,7 @@ NTSTATUS ntlmssp_check_packet(struct ntlmssp_state *ntlmssp_state,
return NT_STATUS_ACCESS_DENIED;
}
}
+ dump_data_pw("checked ntlmssp signature\n", sig->data, sig->length);
return NT_STATUS_OK;
}
@@ -308,14 +309,11 @@ NTSTATUS ntlmssp_seal_packet(struct ntlmssp_state *ntlmssp_state,
then seal the sequence number - this is becouse the ntlmssp_hash is not
constant, but is is rather updated with each iteration */
- dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
- sizeof(ntlmssp_state->ntlmssp_hash));
NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
- dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
- sizeof(ntlmssp_state->ntlmssp_hash));
NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, sig->data+4, sig->length-4);
}
+ dump_data_pw("ntlmssp signature\n", sig->data, sig->length);
dump_data_pw("ntlmssp sealed data\n", data, length);
/* increment counter on send */
@@ -339,13 +337,10 @@ NTSTATUS ntlmssp_unseal_packet(struct ntlmssp_state *ntlmssp_state,
return NT_STATUS_NO_USER_SESSION_KEY;
}
- DEBUG(10,("ntlmssp__unseal_data: seal\n"));
dump_data_pw("ntlmssp sealed data\n", data, length);
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
NTLMSSPcalc_ap(ntlmssp_state->recv_seal_hash, data, length);
} else {
- dump_data_pw("ntlmssp hash:\n", ntlmssp_state->ntlmssp_hash,
- sizeof(ntlmssp_state->ntlmssp_hash));
NTLMSSPcalc_ap(ntlmssp_state->ntlmssp_hash, data, length);
}
dump_data_pw("ntlmssp clear data\n", data, length);
@@ -374,6 +369,7 @@ NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state)
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
{
+ DATA_BLOB weak_session_key = ntlmssp_state->session_key;
const char *send_sign_const;
const char *send_seal_const;
const char *recv_sign_const;
@@ -393,61 +389,69 @@ NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state)
recv_seal_const = CLI_SEAL;
break;
}
+
+ /**
+ Weaken NTLMSSP keys to cope with down-level clients, servers and export restrictions.
+
+ We probably should have some parameters to control this, once we get NTLM2 working.
+ */
+
+
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
+
+ } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
+ weak_session_key.length = 6;
+ } else { /* forty bits */
+ weak_session_key.length = 5;
+ }
+ dump_data_pw("NTLMSSP weakend master key:\n",
+ weak_session_key.data,
+ weak_session_key.length);
/* SEND */
- calc_ntlmv2_hash(ntlmssp_state->send_sign_hash,
- ntlmssp_state->send_sign_key,
- ntlmssp_state->session_key, send_sign_const);
+ calc_ntlmv2_key(ntlmssp_state->send_sign_key,
+ ntlmssp_state->session_key, send_sign_const);
dump_data_pw("NTLMSSP send sign key:\n",
ntlmssp_state->send_sign_key,
sizeof(ntlmssp_state->send_sign_key));
- dump_data_pw("NTLMSSP send sign hash:\n",
- ntlmssp_state->send_sign_hash,
- sizeof(ntlmssp_state->send_sign_hash));
-
- calc_ntlmv2_hash(ntlmssp_state->send_seal_hash,
- ntlmssp_state->send_seal_key,
- ntlmssp_state->session_key, send_seal_const);
+ calc_ntlmv2_key(ntlmssp_state->send_seal_key,
+ weak_session_key, send_seal_const);
dump_data_pw("NTLMSSP send seal key:\n",
ntlmssp_state->send_seal_key,
sizeof(ntlmssp_state->send_seal_key));
-
+
+ calc_hash(ntlmssp_state->send_seal_hash,
+ ntlmssp_state->send_seal_key,
+ sizeof(ntlmssp_state->send_seal_key));
+
dump_data_pw("NTLMSSP send sesl hash:\n",
ntlmssp_state->send_seal_hash,
sizeof(ntlmssp_state->send_seal_hash));
/* RECV */
- calc_ntlmv2_hash(ntlmssp_state->recv_sign_hash,
- ntlmssp_state->recv_sign_key,
- ntlmssp_state->session_key, recv_sign_const);
+ calc_ntlmv2_key(ntlmssp_state->recv_sign_key,
+ ntlmssp_state->session_key, recv_sign_const);
dump_data_pw("NTLMSSP recv sign key:\n",
ntlmssp_state->recv_sign_key,
sizeof(ntlmssp_state->recv_sign_key));
- dump_data_pw("NTLMSSP receive sign hash:\n",
- ntlmssp_state->recv_sign_hash,
- sizeof(ntlmssp_state->recv_sign_hash));
- calc_ntlmv2_hash(ntlmssp_state->recv_seal_hash,
- ntlmssp_state->recv_seal_key,
- ntlmssp_state->session_key, recv_seal_const);
+ calc_ntlmv2_key(ntlmssp_state->recv_seal_key,
+ weak_session_key, recv_seal_const);
dump_data_pw("NTLMSSP recv seal key:\n",
ntlmssp_state->recv_sign_key,
sizeof(ntlmssp_state->recv_seal_key));
- dump_data_pw("NTLMSSP receive seal hash:\n",
- ntlmssp_state->recv_sign_hash,
- sizeof(ntlmssp_state->recv_sign_hash));
+ calc_hash(ntlmssp_state->recv_seal_hash,
+ ntlmssp_state->recv_seal_key,
+ sizeof(ntlmssp_state->recv_seal_key));
+ dump_data_pw("NTLMSSP receive seal hash:\n",
+ ntlmssp_state->recv_seal_hash,
+ sizeof(ntlmssp_state->recv_seal_hash));
} else {
- if (!ntlmssp_state->session_key.data) {
- /* can't sign or check signatures yet */
- DEBUG(5, ("NTLMSSP Sign/Seal - cannot use NT KEY\n"));
- return NT_STATUS_UNSUCCESSFUL;
- }
-
- DEBUG(5, ("NTLMSSP Sign/Seal - using NT KEY\n"));
+ DEBUG(5, ("NTLMSSP Sign/Seal - using NTLM1\n"));
- calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), ntlmssp_state->session_key.length);
+ calc_hash(ntlmssp_state->ntlmssp_hash, (const char *)(ntlmssp_state->session_key.data), 16);
dump_data_pw("NTLMSSP hash:\n", ntlmssp_state->ntlmssp_hash,
sizeof(ntlmssp_state->ntlmssp_hash));
}
generated by cgit (git 2.34.1) at 2024-12-15 18:15:17 +0000