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-rw-r--r--source4/libcli/auth/ntlmssp.c190
-rw-r--r--source4/libcli/auth/ntlmssp.h5
-rw-r--r--source4/libcli/util/smbencrypt.c62
3 files changed, 167 insertions, 90 deletions
diff --git a/source4/libcli/auth/ntlmssp.c b/source4/libcli/auth/ntlmssp.c
index 00cf4d380a..161a15023a 100644
--- a/source4/libcli/auth/ntlmssp.c
+++ b/source4/libcli/auth/ntlmssp.c
@@ -330,10 +330,10 @@ static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
ntlmssp_state->unicode = False;
}
- if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
+ if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm && !ntlmssp_state->use_ntlmv2) {
/* other end forcing us to use LM */
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
- ntlmssp_state->use_ntlmv2 = False;
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
} else {
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
@@ -348,6 +348,13 @@ static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
+ if (neg_flags & NTLMSSP_NEGOTIATE_56) {
+ ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
+ }
+ }
+
+ if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
}
if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
@@ -360,6 +367,32 @@ static 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.
+*/
+
+static void ntlmssp_weaken_keys(struct ntlmssp_state *ntlmssp_state) {
+ /* 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) {
+ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
+
+ } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
+ ntlmssp_state->session_key.data[7] = 0xa0;
+ } else { /* forty bits */
+ ntlmssp_state->session_key.data[5] = 0xe5;
+ ntlmssp_state->session_key.data[6] = 0x38;
+ ntlmssp_state->session_key.data[7] = 0xb0;
+ }
+ }
+}
/**
* Next state function for the Negotiate packet
@@ -404,7 +437,7 @@ static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
debug_ntlmssp_flags(neg_flags);
}
- ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
+ ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
/* Ask our caller what challenge they would like in the packet */
cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
@@ -534,8 +567,8 @@ static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
&workstation,
&ntlmssp_state->encrypted_session_key,
&auth_flags)) {
- DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
- dump_data(2, (const char *)request.data, request.length);
+ DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
+ dump_data(10, (const char *)request.data, request.length);
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
@@ -569,7 +602,7 @@ static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
}
if (auth_flags)
- ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
+ ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
SAFE_FREE(domain);
@@ -636,6 +669,9 @@ static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
data_blob_free(&ntlmssp_state->encrypted_session_key);
return nt_status;
}
+
+ /* LM Key is incompatible... */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
}
return NT_STATUS_OK;
@@ -680,7 +716,10 @@ static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state,
DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
session_key = data_blob(NULL, 0);
}
- } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
+ } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
+ /* Ensure we can never get here on NTLMv2 */
+ && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
+
if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
@@ -688,27 +727,47 @@ static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state,
session_key.data);
DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
dump_data_pw("LM session key:\n", session_key.data, session_key.length);
- } else {
- /* use the key unmodified - it's
- * probably a NULL key from the guest
- * login */
- session_key = *lm_session_key;
+ } else {
+
+ /* When there is no LM response, just use zeros */
+ static const uchar zeros[24];
+ session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
+ SMBsesskeygen_lm_sess_key(zeros, zeros,
+ session_key.data);
+ DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
+ dump_data_pw("LM session key:\n", session_key.data, session_key.length);
}
} else {
+ /* LM Key not selected */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
session_key = data_blob(NULL, 0);
}
+
} else if (user_session_key && user_session_key->data) {
session_key = *user_session_key;
DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
+
+ /* LM Key not selected */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
} else if (lm_session_key && lm_session_key->data) {
+ /* Very weird to have LM key, but no user session key, but anyway.. */
session_key = *lm_session_key;
DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
+
+ /* LM Key not selected */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
} else {
DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
session_key = data_blob(NULL, 0);
+
+ /* LM Key not selected */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
/* With KEY_EXCH, the client supplies the proposed session key,
@@ -741,6 +800,9 @@ static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state,
ntlmssp_state->session_key = session_key;
}
+ /* The server might need us to use a partial-strength session key */
+ ntlmssp_weaken_keys(ntlmssp_state);
+
nt_status = ntlmssp_sign_init(ntlmssp_state);
data_blob_free(&ntlmssp_state->encrypted_session_key);
@@ -824,6 +886,9 @@ NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
(*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
+ (*ntlmssp_state)->allow_lm_key = (lp_lanman_auth()
+ && lp_parm_bool(-1, "ntlmssp_server", "allow_lm_key", False));
+
(*ntlmssp_state)->ref_count = 1;
(*ntlmssp_state)->neg_flags =
@@ -895,9 +960,11 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
char *server_domain;
const char *chal_parse_string;
const char *auth_gen_string;
+ uchar lm_hash[16];
DATA_BLOB lm_response = data_blob(NULL, 0);
DATA_BLOB nt_response = data_blob(NULL, 0);
DATA_BLOB session_key = data_blob(NULL, 0);
+ DATA_BLOB lm_session_key = data_blob(NULL, 0);
DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
NTSTATUS nt_status;
@@ -917,7 +984,7 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
- ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
+ ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
@@ -967,7 +1034,8 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
/* session key is all zeros */
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
-
+ lm_session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
+
/* not doing NLTM2 without a password */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
} else if (ntlmssp_state->use_ntlmv2) {
@@ -990,6 +1058,10 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
data_blob_free(&struct_blob);
return NT_STATUS_NO_MEMORY;
}
+
+ /* LM Key is incompatible... */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
} else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
struct MD5Context md5_session_nonce_ctx;
uchar nt_hash[16];
@@ -1024,38 +1096,69 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
+
+ /* LM Key is incompatible... */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
} else {
-
-
- uchar lm_hash[16];
uchar nt_hash[16];
- E_deshash(ntlmssp_state->password, lm_hash);
- E_md4hash(ntlmssp_state->password, nt_hash);
-
+
+ if (ntlmssp_state->use_nt_response) {
+ nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
+ SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
+ nt_response.data);
+ E_md4hash(ntlmssp_state->password, nt_hash);
+ session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
+ SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
+ dump_data_pw("NT session key:\n", session_key.data, session_key.length);
+ }
+
/* lanman auth is insecure, it may be disabled */
if (lp_client_lanman_auth()) {
lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
- SMBencrypt(ntlmssp_state->password,challenge_blob.data,
- lm_response.data);
+ if (!SMBencrypt(ntlmssp_state->password,challenge_blob.data,
+ lm_response.data)) {
+ /* If the LM password was too long (and therefore the LM hash being
+ of the first 14 chars only), don't send it */
+ data_blob_free(&lm_response);
+
+ /* LM Key is incompatible with 'long' passwords */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+ } else {
+ E_deshash(ntlmssp_state->password, lm_hash);
+ lm_session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
+ memcpy(lm_session_key.data, lm_hash, 8);
+ memset(&lm_session_key.data[8], '\0', 8);
+
+ if (!ntlmssp_state->use_nt_response) {
+ session_key = lm_session_key;
+ }
+ }
+ } else {
+ /* LM Key is incompatible... */
+ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
- nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
- SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
- nt_response.data);
-
- session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
- if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
- && lp_client_lanman_auth()) {
- SMBsesskeygen_lmv1(lm_hash, lm_response.data,
- session_key.data);
- dump_data_pw("LM session key\n", session_key.data, session_key.length);
+ }
+
+ if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
+ && lp_client_lanman_auth() && lm_session_key.length == 16) {
+ DATA_BLOB new_session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
+ if (lm_response.length == 24) {
+ SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
+ new_session_key.data);
} else {
- SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
- dump_data_pw("NT session key:\n", session_key.data, session_key.length);
+ static const uchar zeros[24];
+ SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
+ new_session_key.data);
}
+ new_session_key.length = 16;
+ session_key = new_session_key;
+ dump_data_pw("LM session key\n", session_key.data, session_key.length);
}
+
data_blob_free(&struct_blob);
+
/* Key exchange encryptes a new client-generated session key with
the password-derived key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
@@ -1093,10 +1196,14 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
data_blob_free(&ntlmssp_state->chal);
+ ntlmssp_state->session_key = session_key;
+
+ /* The client might be using 56 or 40 bit weakened keys */
+ ntlmssp_weaken_keys(ntlmssp_state);
+
ntlmssp_state->chal = challenge_blob;
ntlmssp_state->lm_resp = lm_response;
ntlmssp_state->nt_resp = nt_response;
- ntlmssp_state->session_key = session_key;
ntlmssp_state->expected_state = NTLMSSP_UNKNOWN;
@@ -1128,7 +1235,12 @@ NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
(*ntlmssp_state)->get_global_myname = global_myname;
(*ntlmssp_state)->get_domain = lp_workgroup;
- (*ntlmssp_state)->unicode = True;
+ (*ntlmssp_state)->unicode = lp_parm_bool(-1, "ntlmssp_client", "unicode", True);
+
+ (*ntlmssp_state)->use_nt_response = lp_parm_bool(-1, "ntlmssp_client", "send_nt_reponse", True);
+
+ (*ntlmssp_state)->allow_lm_key = (lp_lanman_auth()
+ && lp_parm_bool(-1, "ntlmssp_client", "allow_lm_key", False));
(*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
@@ -1145,7 +1257,11 @@ NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
* We need to set this to allow a later SetPassword
* via the SAMR pipe to succeed. Strange.... We could
* also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
- * */
+ *
+ * Without this, Windows will not create the master key
+ * that it thinks is only used for NTLMSSP signing and
+ * sealing. (It is actually pulled out and used directly)
+ */
NTLMSSP_NEGOTIATE_SIGN |
NTLMSSP_REQUEST_TARGET;
diff --git a/source4/libcli/auth/ntlmssp.h b/source4/libcli/auth/ntlmssp.h
index d678e26e21..a5e0951fa8 100644
--- a/source4/libcli/auth/ntlmssp.h
+++ b/source4/libcli/auth/ntlmssp.h
@@ -61,7 +61,7 @@ enum NTLM_MESSAGE_TYPE
#define NTLMSSP_CHAL_TARGET_INFO 0x00800000
#define NTLMSSP_NEGOTIATE_128 0x20000000 /* 128-bit encryption */
#define NTLMSSP_NEGOTIATE_KEY_EXCH 0x40000000
-#define NTLMSSP_NEGOTIATE_080000000 0x80000000
+#define NTLMSSP_NEGOTIATE_56 0x80000000
#define NTLMSSP_NAME_TYPE_SERVER 0x01
#define NTLMSSP_NAME_TYPE_DOMAIN 0x02
@@ -80,6 +80,9 @@ typedef struct ntlmssp_state
BOOL unicode;
BOOL use_ntlmv2;
+ BOOL use_nt_response; /* Set to 'NO' to debug what happens when the NT response is omited */
+ BOOL allow_lm_key; /* The LM_KEY code is not functional at this point, and it's not
+ very secure anyway */
char *user;
char *domain;
char *workstation;
diff --git a/source4/libcli/util/smbencrypt.c b/source4/libcli/util/smbencrypt.c
index 4b2c753637..cefd01bf1c 100644
--- a/source4/libcli/util/smbencrypt.c
+++ b/source4/libcli/util/smbencrypt.c
@@ -198,25 +198,6 @@ void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
E_P24(p21, c8, p24);
}
-/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
-void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24])
-{
- uchar p21[21];
-
- memset(p21,'\0',21);
- memcpy(p21, passwd, 8);
- memset(p21 + 8, 0xbd, 8);
-
- E_P24(p21, ntlmchalresp, p24);
-#ifdef DEBUG_PASSWORD
- DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
- dump_data(100, (char *)p21, 21);
- dump_data(100, (const char *)ntlmchalresp, 8);
- dump_data(100, (char *)p24, 24);
-#endif
-}
-
-
/* Does the NT MD4 hash then des encryption. */
void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24)
@@ -288,48 +269,25 @@ void SMBsesskeygen_ntv1(const uchar kr[16],
#endif
}
-void SMBsesskeygen_lmv1(const uchar lm_hash[16],
- const uchar lm_resp[24], /* only uses 8 */
- uint8 sess_key[16])
+void SMBsesskeygen_lm_sess_key(const uchar lm_hash[16],
+ const uchar lm_resp[24], /* only uses 8 */
+ uint8 sess_key[16])
{
/* Calculate the LM session key (effective length 40 bits,
but changes with each session) */
-
uchar p24[24];
- uchar partial_lm_hash[16];
-
- memcpy(partial_lm_hash, lm_hash, 8);
- memset(partial_lm_hash + 8, 0xbd, 8);
-
- SMBOWFencrypt(lm_hash, lm_resp, p24);
-
- memcpy(sess_key, p24, 16);
- sess_key[5] = 0xe5;
- sess_key[6] = 0x38;
- sess_key[7] = 0xb0;
-
-#ifdef DEBUG_PASSWORD
- DEBUG(100, ("SMBsesskeygen_lmv1:\n"));
- dump_data(100, sess_key, 16);
-#endif
-}
+ uchar p21[21];
+
+ memset(p21,'\0',21);
+ memcpy(p21, lm_hash, 8);
+ memset(p21 + 8, 0xbd, 8);
-void SMBsesskeygen_lm_sess_key(const uchar lm_hash[16],
- const uchar lm_resp[24], /* only uses 8 */
- uint8 sess_key[16])
-{
- uchar p24[24];
- uchar partial_lm_hash[16];
-
- memcpy(partial_lm_hash, lm_hash, 8);
- memset(partial_lm_hash + 8, 0xbd, 8);
+ E_P24(p21, lm_resp, p24);
- SMBOWFencrypt(partial_lm_hash, lm_resp, p24);
-
memcpy(sess_key, p24, 16);
#ifdef DEBUG_PASSWORD
- DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n"));
+ DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
dump_data(100, sess_key, 16);
#endif
}
generated by cgit (git 2.34.1) at 2024-12-16 00:45:06 +0000