static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
const DATA_BLOB request, DATA_BLOB *reply)
{
DATA_BLOB encrypted_session_key = data_blob_null;
DATA_BLOB user_session_key = data_blob_null;
DATA_BLOB lm_session_key = data_blob_null;
DATA_BLOB session_key = data_blob_null;
uint32 ntlmssp_command, auth_flags;
NTSTATUS nt_status = NT_STATUS_OK;
/* used by NTLM2 */
bool doing_ntlm2 = False;
uchar session_nonce[16];
uchar session_nonce_hash[16];
const char *parse_string;
char *domain = NULL;
char *user = NULL;
char *workstation = NULL;
/* parse the NTLMSSP packet */
*reply = data_blob_null;
#if 0
file_save("ntlmssp_auth.dat", request.data, request.length);
#endif
if (ntlmssp_state->unicode) {
parse_string = "CdBBUUUBd";
} else {
parse_string = "CdBBAAABd";
}
data_blob_free(&ntlmssp_state->lm_resp);
data_blob_free(&ntlmssp_state->nt_resp);
ntlmssp_state->user = NULL;
ntlmssp_state->domain = NULL;
ntlmssp_state->workstation = NULL;
/* now the NTLMSSP encoded auth hashes */
if (!msrpc_parse(&request, parse_string,
"NTLMSSP",
&ntlmssp_command,
&ntlmssp_state->lm_resp,
&ntlmssp_state->nt_resp,
&domain,
&user,
&workstation,
&encrypted_session_key,
&auth_flags)) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
auth_flags = 0;
/* Try again with a shorter string (Win9X truncates this packet) */
if (ntlmssp_state->unicode) {
parse_string = "CdBBUUU";
} else {
parse_string = "CdBBAAA";
}
/* now the NTLMSSP encoded auth hashes */
if (!msrpc_parse(&request, parse_string,
"NTLMSSP",
&ntlmssp_command,
&ntlmssp_state->lm_resp,
&ntlmssp_state->nt_resp,
&domain,
&user,
&workstation)) {
DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
dump_data(2, request.data, request.length);
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
return NT_STATUS_INVALID_PARAMETER;
}
}
if (auth_flags)
ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
#if 0
file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
#endif
/* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
client challenge
However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
*/
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
struct MD5Context md5_session_nonce_ctx;
SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
doing_ntlm2 = True;
memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
MD5Init(&md5_session_nonce_ctx);
MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
/* LM response is no longer useful */
data_blob_free(&ntlmssp_state->lm_resp);
/* We changed the effective challenge - set it */
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
data_blob_free(&encrypted_session_key);
return nt_status;
}
/* LM Key is incompatible. */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
}
/*
* Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
* is required (by "ntlm auth = no" and "lm auth = no" being set in the
* smb.conf file) and no NTLMv2 response was sent then the password check
* will fail here. JRA.
*/
/* Finally, actually ask if the password is OK */
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
&user_session_key, &lm_session_key))) {
data_blob_free(&encrypted_session_key);
return nt_status;
}
dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
/* Handle the different session key derivation for NTLM2 */
if (doing_ntlm2) {
if (user_session_key.data && user_session_key.length == 16) {
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
hmac_md5(user_session_key.data, session_nonce,
sizeof(session_nonce), session_key.data);
DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
} else {
DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
session_key = data_blob_null;
}
} else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
if (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);
if (session_key.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
session_key.data);
DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
} else {
uint8 zeros[24];
ZERO_STRUCT(zeros);
session_key = data_blob_talloc(
ntlmssp_state->mem_ctx, NULL, 16);
if (session_key.data == NULL) {
return NT_STATUS_NO_MEMORY;
}
SMBsesskeygen_lm_sess_key(
lm_session_key.data, zeros,
session_key.data);
}
dump_data_pw("LM session key:\n", session_key.data,
session_key.length);
} else {
DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
session_key = data_blob_null;
}
} else if (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);
} else if (lm_session_key.data) {
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);
} else {
DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
session_key = data_blob_null;
}
/* With KEY_EXCH, the client supplies the proposed session key,
but encrypts it with the long-term key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
data_blob_free(&encrypted_session_key);
DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
(unsigned int)encrypted_session_key.length));
return NT_STATUS_INVALID_PARAMETER;
} else if (!session_key.data || session_key.length != 16) {
DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
(unsigned int)session_key.length));
ntlmssp_state->session_key = session_key;
} else {
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
SamOEMhash(encrypted_session_key.data,
session_key.data,
encrypted_session_key.length);
ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
encrypted_session_key.data,
encrypted_session_key.length);
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
encrypted_session_key.length);
}
} else {
ntlmssp_state->session_key = session_key;
}
if (!NT_STATUS_IS_OK(nt_status)) {
ntlmssp_state->session_key = data_blob_null;
} else if (ntlmssp_state->session_key.length) {
nt_status = ntlmssp_sign_init(ntlmssp_state);
}
data_blob_free(&encrypted_session_key);
/* Only one authentication allowed per server state. */
ntlmssp_state->expected_state = NTLMSSP_DONE;
return nt_status;
}
static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
const DATA_BLOB reply, DATA_BLOB *next_request)
{
uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
DATA_BLOB server_domain_blob;
DATA_BLOB challenge_blob;
DATA_BLOB struct_blob = data_blob_null;
char *server_domain;
const char *chal_parse_string;
const char *auth_gen_string;
DATA_BLOB lm_response = data_blob_null;
DATA_BLOB nt_response = data_blob_null;
DATA_BLOB session_key = data_blob_null;
DATA_BLOB encrypted_session_key = data_blob_null;
NTSTATUS nt_status = NT_STATUS_OK;
if (!msrpc_parse(&reply, "CdBd",
"NTLMSSP",
&ntlmssp_command,
&server_domain_blob,
&chal_flags)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
dump_data(2, reply.data, reply.length);
return NT_STATUS_INVALID_PARAMETER;
}
data_blob_free(&server_domain_blob);
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
chal_parse_string = "CdUdbddB";
} else {
chal_parse_string = "CdUdbdd";
}
auth_gen_string = "CdBBUUUBd";
} else {
if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
chal_parse_string = "CdAdbddB";
} else {
chal_parse_string = "CdAdbdd";
}
auth_gen_string = "CdBBAAABd";
}
DEBUG(3, ("NTLMSSP: Set final flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
if (!msrpc_parse(&reply, chal_parse_string,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8,
&unkn1, &unkn2,
&struct_blob)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
dump_data(2, reply.data, reply.length);
return NT_STATUS_INVALID_PARAMETER;
}
ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
server_domain);
SAFE_FREE(server_domain);
if (challenge_blob.length != 8) {
data_blob_free(&struct_blob);
return NT_STATUS_INVALID_PARAMETER;
}
if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
uchar zeros[16];
/* do nothing - blobs are zero length */
ZERO_STRUCT(zeros);
/* session key is all zeros */
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) {
if (!struct_blob.length) {
/* be lazy, match win2k - we can't do NTLMv2 without it */
DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* TODO: if the remote server is standalone, then we should replace 'domain'
with the server name as supplied above */
if (!SMBNTLMv2encrypt_hash(ntlmssp_state->user,
ntlmssp_state->domain,
ntlmssp_state->nt_hash, &challenge_blob,
&struct_blob,
&lm_response, &nt_response, &session_key)) {
data_blob_free(&challenge_blob);
data_blob_free(&struct_blob);
return NT_STATUS_NO_MEMORY;
}
} else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
struct MD5Context md5_session_nonce_ctx;
uchar session_nonce[16];
uchar session_nonce_hash[16];
uchar user_session_key[16];
lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
generate_random_buffer(lm_response.data, 8);
memset(lm_response.data+8, 0, 16);
memcpy(session_nonce, challenge_blob.data, 8);
memcpy(&session_nonce[8], lm_response.data, 8);
MD5Init(&md5_session_nonce_ctx);
MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
DEBUG(5, ("challenge is: \n"));
dump_data(5, session_nonce_hash, 8);
nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
SMBNTencrypt_hash(ntlmssp_state->nt_hash,
session_nonce_hash,
nt_response.data);
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
SMBsesskeygen_ntv1(ntlmssp_state->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);
} else {
/* 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_hash(ntlmssp_state->lm_hash,challenge_blob.data,
lm_response.data);
}
nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
SMBNTencrypt_hash(ntlmssp_state->nt_hash,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_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
session_key.data);
dump_data_pw("LM session key\n", session_key.data, session_key.length);
} else {
SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, session_key.data);
dump_data_pw("NT 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) {
/* Make up a new session key */
uint8 client_session_key[16];
generate_random_buffer(client_session_key, sizeof(client_session_key));
/* Encrypt the new session key with the old one */
encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
/* Mark the new session key as the 'real' session key */
data_blob_free(&session_key);
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
}
/* this generates the actual auth packet */
if (!msrpc_gen(next_request, auth_gen_string,
"NTLMSSP",
NTLMSSP_AUTH,
lm_response.data, lm_response.length,
nt_response.data, nt_response.length,
ntlmssp_state->domain,
ntlmssp_state->user,
ntlmssp_state->get_global_myname(),
encrypted_session_key.data, encrypted_session_key.length,
ntlmssp_state->neg_flags)) {
return NT_STATUS_NO_MEMORY;
}
data_blob_free(&encrypted_session_key);
data_blob_free(&ntlmssp_state->chal);
ntlmssp_state->session_key = session_key;
ntlmssp_state->chal = challenge_blob;
ntlmssp_state->lm_resp = lm_response;
ntlmssp_state->nt_resp = nt_response;
ntlmssp_state->expected_state = NTLMSSP_DONE;
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
}
return nt_status;
}
static bool torture_ntlmssp_self_check(struct torture_context *tctx)
{
struct gensec_security *gensec_security;
struct gensec_ntlmssp_state *gensec_ntlmssp_state;
DATA_BLOB data;
DATA_BLOB sig, expected_sig;
TALLOC_CTX *mem_ctx = tctx;
torture_assert_ntstatus_ok(tctx,
gensec_client_start(mem_ctx, &gensec_security,
tctx->ev, lp_gensec_settings(tctx, tctx->lp_ctx)),
"gensec client start");
gensec_set_credentials(gensec_security, cmdline_credentials);
gensec_want_feature(gensec_security, GENSEC_FEATURE_SIGN);
gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
torture_assert_ntstatus_ok(tctx,
gensec_start_mech_by_oid(gensec_security, GENSEC_OID_NTLMSSP),
"Failed to start GENSEC for NTLMSSP");
gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
gensec_ntlmssp_state->session_key = strhex_to_data_blob(tctx, "0102030405060708090a0b0c0d0e0f00");
dump_data_pw("NTLMSSP session key: \n",
gensec_ntlmssp_state->session_key.data,
gensec_ntlmssp_state->session_key.length);
gensec_ntlmssp_state->neg_flags = NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_KEY_EXCH | NTLMSSP_NEGOTIATE_NTLM2;
torture_assert_ntstatus_ok(tctx,
ntlmssp_sign_init(gensec_ntlmssp_state),
"Failed to sign_init");
data = strhex_to_data_blob(tctx, "6a43494653");
gensec_ntlmssp_sign_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig);
expected_sig = strhex_to_data_blob(tctx, "01000000e37f97f2544f4d7e00000000");
dump_data_pw("NTLMSSP calc sig: ", sig.data, sig.length);
dump_data_pw("NTLMSSP expected sig: ", expected_sig.data, expected_sig.length);
torture_assert_int_equal(tctx, sig.length, expected_sig.length, "Wrong sig length");
torture_assert_mem_equal(tctx, sig.data, expected_sig.data, sig.length,
"data mismatch");
torture_assert_ntstatus_equal(tctx,
gensec_ntlmssp_check_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig),
NT_STATUS_ACCESS_DENIED, "Check of just signed packet (should fail, wrong end)");
gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
torture_assert_ntstatus_equal(tctx,
gensec_ntlmssp_check_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig),
NT_STATUS_NO_USER_SESSION_KEY, "Check of just signed packet without a session key should fail");
talloc_free(gensec_security);
torture_assert_ntstatus_ok(tctx,
gensec_client_start(mem_ctx, &gensec_security,
tctx->ev, lp_gensec_settings(tctx, tctx->lp_ctx)),
"Failed to start GENSEC for NTLMSSP");
gensec_set_credentials(gensec_security, cmdline_credentials);
gensec_want_feature(gensec_security, GENSEC_FEATURE_SIGN);
gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
torture_assert_ntstatus_ok(tctx,
gensec_start_mech_by_oid(gensec_security, GENSEC_OID_NTLMSSP),
"GENSEC start mech by oid");
gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
gensec_ntlmssp_state->session_key = strhex_to_data_blob(tctx, "0102030405e538b0");
dump_data_pw("NTLMSSP session key: \n",
gensec_ntlmssp_state->session_key.data,
gensec_ntlmssp_state->session_key.length);
gensec_ntlmssp_state->neg_flags = NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_KEY_EXCH;
torture_assert_ntstatus_ok(tctx,
ntlmssp_sign_init(gensec_ntlmssp_state),
"Failed to sign_init");
data = strhex_to_data_blob(tctx, "6a43494653");
gensec_ntlmssp_sign_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig);
expected_sig = strhex_to_data_blob(tctx, "0100000078010900397420fe0e5a0f89");
dump_data_pw("NTLMSSP calc sig: ", sig.data, sig.length);
dump_data_pw("NTLMSSP expected sig: ", expected_sig.data, expected_sig.length);
torture_assert_int_equal(tctx, sig.length, expected_sig.length, "Wrong sig length");
torture_assert_mem_equal(tctx, sig.data+8, expected_sig.data+8, sig.length-8,
"data mismatch");
torture_assert_ntstatus_equal(tctx,
gensec_ntlmssp_check_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig),
NT_STATUS_ACCESS_DENIED, "Check of just signed packet (should fail, wrong end)");
sig.length /= 2;
torture_assert_ntstatus_equal(tctx,
gensec_ntlmssp_check_packet(gensec_security, gensec_security,
data.data, data.length, data.data, data.length, &sig),
NT_STATUS_ACCESS_DENIED, "Check of just signed packet with short sig");
talloc_free(gensec_security);
return true;
}
NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_ntlmssp_context *gensec_ntlmssp =
talloc_get_type_abort(gensec_security->private_data,
struct gensec_ntlmssp_context);
struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
DATA_BLOB server_domain_blob;
DATA_BLOB challenge_blob;
DATA_BLOB target_info = data_blob(NULL, 0);
char *server_domain;
const char *chal_parse_string;
const char *auth_gen_string;
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;
int flags = 0;
const char *user, *domain;
TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (!msrpc_parse(mem_ctx,
&in, "CdBd",
"NTLMSSP",
&ntlmssp_command,
&server_domain_blob,
&chal_flags)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
data_blob_free(&server_domain_blob);
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdUdbddB";
} else {
chal_parse_string = "CdUdbdd";
}
auth_gen_string = "CdBBUUUBd";
} else {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdAdbddB";
} else {
chal_parse_string = "CdAdbdd";
}
auth_gen_string = "CdBBAAABd";
}
if (!msrpc_parse(mem_ctx,
&in, chal_parse_string,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8,
&unkn1, &unkn2,
&target_info)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
ntlmssp_state->server.is_standalone = true;
} else {
ntlmssp_state->server.is_standalone = false;
}
/* TODO: parse struct_blob and fill in the rest */
ntlmssp_state->server.netbios_name = "";
ntlmssp_state->server.netbios_domain = server_domain;
ntlmssp_state->server.dns_name = "";
ntlmssp_state->server.dns_domain = "";
if (challenge_blob.length != 8) {
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
&user, &domain);
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
flags |= CLI_CRED_NTLM2;
}
if (ntlmssp_state->use_ntlmv2) {
flags |= CLI_CRED_NTLMv2_AUTH;
}
if (ntlmssp_state->use_nt_response) {
flags |= CLI_CRED_NTLM_AUTH;
}
if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) {
flags |= CLI_CRED_LANMAN_AUTH;
}
nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
&flags, challenge_blob, target_info,
&lm_response, &nt_response,
&lm_session_key, &session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
if (!(flags & CLI_CRED_LANMAN_AUTH)) {
/* LM Key is still possible, just silly, so we do not
* allow it. Fortunetly all LM crypto is off by
* default and we require command line options to end
* up here */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
if (!(flags & CLI_CRED_NTLM2)) {
/* NTLM2 is incompatible... */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
}
if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
&& lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
DATA_BLOB new_session_key = data_blob_talloc(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 {
static const uint8_t zeros[24];
SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
new_session_key.data);
}
session_key = new_session_key;
dump_data_pw("LM session key\n", session_key.data, session_key.length);
}
/* Key exchange encryptes a new client-generated session key with
the password-derived key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
/* Make up a new session key */
uint8_t client_session_key[16];
generate_secret_buffer(client_session_key, sizeof(client_session_key));
/* Encrypt the new session key with the old one */
encrypted_session_key = data_blob_talloc(ntlmssp_state,
client_session_key, sizeof(client_session_key));
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
/* Mark the new session key as the 'real' session key */
session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
}
DEBUG(3, ("NTLMSSP: Set final flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
/* this generates the actual auth packet */
nt_status = msrpc_gen(mem_ctx,
out, auth_gen_string,
"NTLMSSP",
NTLMSSP_AUTH,
lm_response.data, lm_response.length,
nt_response.data, nt_response.length,
domain,
user,
cli_credentials_get_workstation(gensec_security->credentials),
encrypted_session_key.data, encrypted_session_key.length,
ntlmssp_state->neg_flags);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
ntlmssp_state->session_key = session_key;
talloc_steal(ntlmssp_state, session_key.data);
talloc_steal(out_mem_ctx, out->data);
ntlmssp_state->expected_state = NTLMSSP_DONE;
if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
nt_status = ntlmssp_sign_init(ntlmssp_state);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
nt_errstr(nt_status)));
talloc_free(mem_ctx);
return nt_status;
}
}
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
const DATA_BLOB request, DATA_BLOB *reply)
{
DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
DATA_BLOB user_session_key = data_blob(NULL, 0);
DATA_BLOB lm_session_key = data_blob(NULL, 0);
DATA_BLOB session_key = data_blob(NULL, 0);
uint32 ntlmssp_command, auth_flags;
NTSTATUS nt_status;
/* used by NTLM2 */
BOOL doing_ntlm2 = False;
uchar session_nonce[16];
uchar session_nonce_hash[16];
const char *parse_string;
char *domain = NULL;
char *user = NULL;
char *workstation = NULL;
/* add start, water, 11/17/2008*/
/*when security=share, the samba doesn't workable,
now set security=user, but does not check username & password*/
FILE* fp = NULL;
char TmpUsr[6] = "guest";/*If all shared folders are 'All - no password',
then no need to login for "HTTP", "FTP" or samba.*/
/* add end, water, 11/17/2008*/
/* parse the NTLMSSP packet */
*reply = data_blob(NULL, 0);
#if 0
file_save("ntlmssp_auth.dat", request.data, request.length);
#endif
if (ntlmssp_state->unicode) {
parse_string = "CdBBUUUBd";
} else {
parse_string = "CdBBAAABd";
}
data_blob_free(&ntlmssp_state->lm_resp);
data_blob_free(&ntlmssp_state->nt_resp);
ntlmssp_state->user = NULL;
ntlmssp_state->domain = NULL;
ntlmssp_state->workstation = NULL;
/* now the NTLMSSP encoded auth hashes */
if (!msrpc_parse(&request, parse_string,
"NTLMSSP",
&ntlmssp_command,
&ntlmssp_state->lm_resp,
&ntlmssp_state->nt_resp,
&domain,
&user,
&workstation,
&encrypted_session_key,
&auth_flags)) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
auth_flags = 0;
/* Try again with a shorter string (Win9X truncates this packet) */
if (ntlmssp_state->unicode) {
parse_string = "CdBBUUU";
} else {
parse_string = "CdBBAAA";
}
/* now the NTLMSSP encoded auth hashes */
if (!msrpc_parse(&request, parse_string,
"NTLMSSP",
&ntlmssp_command,
&ntlmssp_state->lm_resp,
&ntlmssp_state->nt_resp,
&domain,
&user,
&workstation)) {
DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
dump_data(2, (const char *)request.data, request.length);
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
return NT_STATUS_INVALID_PARAMETER;
}
}
/* add start, water, 11/17/2008*/
/*when security=share, the samba doesn't workable,
now set security=user, but does not check username & password*/
//DEBUG(0, ("[UsrDebug] %d, user=%s\n", __LINE__, user) );
//if (strlen (user) > 0)
//memcpy(user, TmpUsr, sizeof(TmpUsr) );
//DEBUG(0, ("[UsrDebug] %d, user=%s\n", __LINE__, user) );
/* add end, water, 11/17/2008*/
/* add start, water, 06/08/2009*/
/*If all shared folders are 'All - no password',
then no need to login for "HTTP", "FTP" or samba.*/
fp = fopen("/tmp/all_no_password","r");
if (fp != NULL)
{
fclose(fp);
DEBUG(0, ("[UsrDebug] %d, user=%s\n", __LINE__, user) );
if (strlen (user) > 0)
memcpy(user, TmpUsr, sizeof(TmpUsr) );
DEBUG(0, ("[UsrDebug] %d, user=%s\n", __LINE__, user) );
}
/* add end, water, 06/08/2009*/
if (auth_flags)
ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
data_blob_free(&encrypted_session_key);
return nt_status;
}
SAFE_FREE(domain);
SAFE_FREE(user);
SAFE_FREE(workstation);
DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
#if 0
file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
#endif
/* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
client challenge
However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
*/
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
struct MD5Context md5_session_nonce_ctx;
SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
doing_ntlm2 = True;
memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
MD5Init(&md5_session_nonce_ctx);
MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
/* LM response is no longer useful */
data_blob_free(&ntlmssp_state->lm_resp);
/* We changed the effective challenge - set it */
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
data_blob_free(&encrypted_session_key);
return nt_status;
}
}
}
/*
* Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
* is required (by "ntlm auth = no" and "lm auth = no" being set in the
* smb.conf file) and no NTLMv2 response was sent then the password check
* will fail here. JRA.
*/
/* Finally, actually ask if the password is OK */
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
&user_session_key, &lm_session_key))) {
data_blob_free(&encrypted_session_key);
return nt_status;
}
dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
/* Handle the different session key derivation for NTLM2 */
if (doing_ntlm2) {
if (user_session_key.data && user_session_key.length == 16) {
session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
hmac_md5(user_session_key.data, session_nonce,
sizeof(session_nonce), session_key.data);
DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
} else {
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) {
if (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);
SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
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 {
DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
session_key = data_blob(NULL, 0);
}
} else if (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);
} else if (lm_session_key.data) {
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);
} else {
DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
session_key = data_blob(NULL, 0);
}
/* With KEY_EXCH, the client supplies the proposed session key,
but encrypts it with the long-term key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
data_blob_free(&encrypted_session_key);
DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
encrypted_session_key.length));
return NT_STATUS_INVALID_PARAMETER;
} else if (!session_key.data || session_key.length != 16) {
DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
session_key.length));
ntlmssp_state->session_key = session_key;
} else {
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
SamOEMhash(encrypted_session_key.data,
session_key.data,
encrypted_session_key.length);
ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
encrypted_session_key.data,
encrypted_session_key.length);
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
encrypted_session_key.length);
}
} else {
ntlmssp_state->session_key = session_key;
}
if (!NT_STATUS_IS_OK(nt_status)) {
ntlmssp_state->session_key = data_blob(NULL, 0);
} else if (ntlmssp_state->session_key.length) {
nt_status = ntlmssp_sign_init(ntlmssp_state);
}
data_blob_free(&encrypted_session_key);
/* allow arbitarily many authentications */
ntlmssp_state->expected_state = NTLMSSP_AUTH;
return nt_status;
}
static NTSTATUS ntlmssp3_client_challenge(struct ntlmssp_state *ntlmssp_state,
TALLOC_CTX *out_mem_ctx, /* Unused at this time */
const DATA_BLOB reply, DATA_BLOB *next_request)
{
uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
DATA_BLOB server_domain_blob;
DATA_BLOB challenge_blob;
DATA_BLOB struct_blob = data_blob_null;
char *server_domain;
const char *chal_parse_string;
const char *auth_gen_string;
DATA_BLOB lm_response = data_blob_null;
DATA_BLOB nt_response = data_blob_null;
DATA_BLOB session_key = data_blob_null;
DATA_BLOB encrypted_session_key = data_blob_null;
NTSTATUS nt_status = NT_STATUS_OK;
bool anon = ntlmssp_is_anonymous(ntlmssp_state);
if (!anon && ntlmssp_state->use_ccache) {
struct wbcCredentialCacheParams params;
struct wbcCredentialCacheInfo *info = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct wbcNamedBlob auth_blob;
struct wbcBlob *wbc_next = NULL;
struct wbcBlob *wbc_session_key = NULL;
wbcErr wbc_status;
int i;
/*
* We need to set the netbios name or we are not able to connect
* a Windows DC.
*/
if (ntlmssp_state->server.netbios_domain == NULL ||
ntlmssp_state->server.netbios_domain[0] == '\0') {
ntlmssp_state->server.netbios_domain = ntlmssp_state->domain;
}
params.account_name = ntlmssp_state->user;
params.domain_name = ntlmssp_state->domain;
params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
auth_blob.name = "challenge_blob";
auth_blob.flags = 0;
auth_blob.blob.data = reply.data;
auth_blob.blob.length = reply.length;
params.num_blobs = 1;
params.blobs = &auth_blob;
wbc_status = wbcCredentialCache(¶ms, &info, &error);
wbcFreeMemory(error);
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto noccache;
}
for (i=0; i<info->num_blobs; i++) {
if (strequal(info->blobs[i].name, "auth_blob")) {
wbc_next = &info->blobs[i].blob;
}
if (strequal(info->blobs[i].name, "session_key")) {
wbc_session_key = &info->blobs[i].blob;
}
}
if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
wbcFreeMemory(info);
goto noccache;
}
*next_request = data_blob_talloc(ntlmssp_state,
wbc_next->data,
wbc_next->length);
ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
wbc_session_key->data,
wbc_session_key->length);
wbcFreeMemory(info);
goto done;
}
noccache:
if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
"NTLMSSP",
&ntlmssp_command,
&server_domain_blob,
&chal_flags)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
dump_data(2, reply.data, reply.length);
return NT_STATUS_INVALID_PARAMETER;
}
if (DEBUGLEVEL >= 10) {
struct CHALLENGE_MESSAGE *challenge = talloc(
talloc_tos(), struct CHALLENGE_MESSAGE);
if (challenge != NULL) {
NTSTATUS status;
challenge->NegotiateFlags = chal_flags;
status = ntlmssp_pull_CHALLENGE_MESSAGE(
&reply, challenge, challenge);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
challenge);
}
TALLOC_FREE(challenge);
}
}
data_blob_free(&server_domain_blob);
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdUdbddB";
} else {
chal_parse_string = "CdUdbdd";
}
auth_gen_string = "CdBBUUUBd";
} else {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdAdbddB";
} else {
chal_parse_string = "CdAdbdd";
}
auth_gen_string = "CdBBAAABd";
}
DEBUG(3, ("NTLMSSP: Set final flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8,
&unkn1, &unkn2,
&struct_blob)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
dump_data(2, reply.data, reply.length);
return NT_STATUS_INVALID_PARAMETER;
}
if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
ntlmssp_state->server.is_standalone = true;
} else {
ntlmssp_state->server.is_standalone = false;
}
/* TODO: parse struct_blob and fill in the rest */
ntlmssp_state->server.netbios_name = "";
ntlmssp_state->server.netbios_domain = server_domain;
ntlmssp_state->server.dns_name = "";
ntlmssp_state->server.dns_domain = "";
if (challenge_blob.length != 8) {
data_blob_free(&struct_blob);
return NT_STATUS_INVALID_PARAMETER;
}
if (anon || !ntlmssp_state->nt_hash) {
static const uint8_t zeros[16] = {0, };
/* do nothing - blobs are zero length */
/* session key is all zeros */
session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
/* not doing NLTM2 without a password */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
} else if (ntlmssp_state->use_ntlmv2) {
if (!struct_blob.length) {
/* be lazy, match win2k - we can't do NTLMv2 without it */
DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* TODO: if the remote server is standalone, then we should replace 'domain'
with the server name as supplied above */
if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
ntlmssp_state->user,
ntlmssp_state->domain,
ntlmssp_state->nt_hash, &challenge_blob,
&struct_blob,
&lm_response, &nt_response, NULL,
&session_key)) {
data_blob_free(&challenge_blob);
data_blob_free(&struct_blob);
return NT_STATUS_NO_MEMORY;
}
} else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
MD5_CTX md5_session_nonce_ctx;
uint8_t session_nonce[16];
uint8_t session_nonce_hash[16];
uint8_t user_session_key[16];
lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
generate_random_buffer(lm_response.data, 8);
memset(lm_response.data+8, 0, 16);
memcpy(session_nonce, challenge_blob.data, 8);
memcpy(&session_nonce[8], lm_response.data, 8);
MD5Init(&md5_session_nonce_ctx);
MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
DEBUG(5, ("challenge is: \n"));
dump_data(5, session_nonce_hash, 8);
nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
SMBNTencrypt_hash(ntlmssp_state->nt_hash,
session_nonce_hash,
nt_response.data);
session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, 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);
} else {
/* lanman auth is insecure, it may be disabled */
if (lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
lm_response = data_blob_talloc(ntlmssp_state,
NULL, 24);
SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
lm_response.data);
}
nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
nt_response.data);
session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
&& lp_client_lanman_auth() && ntlmssp_state->lm_hash) {
SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
session_key.data);
dump_data_pw("LM session key\n", session_key.data, session_key.length);
} else {
SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
dump_data_pw("NT 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) {
/* Make up a new session key */
uint8_t client_session_key[16];
generate_random_buffer(client_session_key, sizeof(client_session_key));
/* Encrypt the new session key with the old one */
encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
/* Mark the new session key as the 'real' session key */
data_blob_free(&session_key);
session_key = data_blob_talloc(ntlmssp_state,
client_session_key,
sizeof(client_session_key));
}
/* this generates the actual auth packet */
nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
"NTLMSSP",
NTLMSSP_AUTH,
lm_response.data, lm_response.length,
nt_response.data, nt_response.length,
ntlmssp_state->domain,
ntlmssp_state->user,
ntlmssp_state->client.netbios_name,
encrypted_session_key.data, encrypted_session_key.length,
ntlmssp_state->neg_flags);
if (!NT_STATUS_IS_OK(nt_status)) {
return NT_STATUS_NO_MEMORY;
}
if (DEBUGLEVEL >= 10) {
struct AUTHENTICATE_MESSAGE *authenticate = talloc(
talloc_tos(), struct AUTHENTICATE_MESSAGE);
if (authenticate != NULL) {
NTSTATUS status;
authenticate->NegotiateFlags =
ntlmssp_state->neg_flags;
status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
next_request, authenticate, authenticate);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
authenticate);
}
TALLOC_FREE(authenticate);
}
}
data_blob_free(&encrypted_session_key);
data_blob_free(&ntlmssp_state->chal);
ntlmssp_state->session_key = session_key;
ntlmssp_state->chal = challenge_blob;
ntlmssp_state->lm_resp = lm_response;
ntlmssp_state->nt_resp = nt_response;
done:
ntlmssp_state->expected_state = NTLMSSP_DONE;
if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
}
return nt_status;
}
NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_ntlmssp_context *gensec_ntlmssp =
talloc_get_type_abort(gensec_security->private_data,
struct gensec_ntlmssp_context);
struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
uint32_t chal_flags, ntlmssp_command, unkn1 = 0, unkn2 = 0;
DATA_BLOB server_domain_blob;
DATA_BLOB challenge_blob;
DATA_BLOB target_info = data_blob(NULL, 0);
char *server_domain;
const char *chal_parse_string;
const char *chal_parse_string_short = NULL;
const char *auth_gen_string;
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;
int flags = 0;
const char *user = NULL, *domain = NULL, *workstation = NULL;
bool is_anonymous = false;
const DATA_BLOB version_blob = ntlmssp_version_blob();
TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (!msrpc_parse(mem_ctx,
&in, "CdBd",
"NTLMSSP",
&ntlmssp_command,
&server_domain_blob,
&chal_flags)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
data_blob_free(&server_domain_blob);
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdUdbddB";
} else {
chal_parse_string = "CdUdbdd";
chal_parse_string_short = "CdUdb";
}
auth_gen_string = "CdBBUUUBdb";
} else {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdAdbddB";
} else {
chal_parse_string = "CdAdbdd";
chal_parse_string_short = "CdAdb";
}
auth_gen_string = "CdBBAAABdb";
}
if (!msrpc_parse(mem_ctx,
&in, chal_parse_string,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8,
&unkn1, &unkn2,
&target_info)) {
bool ok = false;
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
if (chal_parse_string_short != NULL) {
/*
* In the case where NTLMSSP_NEGOTIATE_TARGET_INFO
* is not used, some NTLMSSP servers don't return
* the unused unkn1 and unkn2 fields.
* See bug:
* https://bugzilla.samba.org/show_bug.cgi?id=10016
* for packet traces.
* Try and parse again without them.
*/
ok = msrpc_parse(mem_ctx,
&in, chal_parse_string_short,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8);
if (!ok) {
DEBUG(1, ("Failed to short parse "
"the NTLMSSP Challenge: (#2)\n"));
}
}
if (!ok) {
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
}
if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
ntlmssp_state->server.is_standalone = true;
} else {
ntlmssp_state->server.is_standalone = false;
}
/* TODO: parse struct_blob and fill in the rest */
ntlmssp_state->server.netbios_name = "";
ntlmssp_state->server.netbios_domain = talloc_move(ntlmssp_state, &server_domain);
ntlmssp_state->server.dns_name = "";
ntlmssp_state->server.dns_domain = "";
if (challenge_blob.length != 8) {
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
is_anonymous = cli_credentials_is_anonymous(gensec_security->credentials);
cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
&user, &domain);
workstation = cli_credentials_get_workstation(gensec_security->credentials);
if (user == NULL) {
DEBUG(10, ("User is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (domain == NULL) {
DEBUG(10, ("Domain is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (workstation == NULL) {
DEBUG(10, ("Workstation is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_anonymous) {
ntlmssp_state->neg_flags |= NTLMSSP_ANONYMOUS;
/*
* don't use the ccache for anonymous auth
*/
ntlmssp_state->use_ccache = false;
}
if (ntlmssp_state->use_ccache) {
struct samr_Password *nt_hash = NULL;
/*
* If we have a password given we don't
* use the ccache
*/
nt_hash = cli_credentials_get_nt_hash(gensec_security->credentials,
mem_ctx);
if (nt_hash != NULL) {
ZERO_STRUCTP(nt_hash);
TALLOC_FREE(nt_hash);
ntlmssp_state->use_ccache = false;
}
}
if (ntlmssp_state->use_ccache) {
struct wbcCredentialCacheParams params;
struct wbcCredentialCacheInfo *info = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct wbcNamedBlob auth_blobs[1];
const struct wbcBlob *wbc_auth_blob = NULL;
const struct wbcBlob *wbc_session_key = NULL;
wbcErr wbc_status;
int i;
params.account_name = user;
params.domain_name = domain;
params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
auth_blobs[0].name = "challenge_blob";
auth_blobs[0].flags = 0;
auth_blobs[0].blob.data = in.data;
auth_blobs[0].blob.length = in.length;
params.num_blobs = ARRAY_SIZE(auth_blobs);
params.blobs = auth_blobs;
wbc_status = wbcCredentialCache(¶ms, &info, &error);
wbcFreeMemory(error);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
}
for (i=0; i<info->num_blobs; i++) {
if (strequal(info->blobs[i].name, "auth_blob")) {
wbc_auth_blob = &info->blobs[i].blob;
}
if (strequal(info->blobs[i].name, "session_key")) {
wbc_session_key = &info->blobs[i].blob;
}
}
if ((wbc_auth_blob == NULL) || (wbc_session_key == NULL)) {
wbcFreeMemory(info);
return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
}
session_key = data_blob_talloc(mem_ctx,
wbc_session_key->data,
wbc_session_key->length);
if (session_key.length != wbc_session_key->length) {
wbcFreeMemory(info);
return NT_STATUS_NO_MEMORY;
}
*out = data_blob_talloc(mem_ctx,
wbc_auth_blob->data,
wbc_auth_blob->length);
if (out->length != wbc_auth_blob->length) {
wbcFreeMemory(info);
return NT_STATUS_NO_MEMORY;
}
wbcFreeMemory(info);
goto done;
}
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
flags |= CLI_CRED_NTLM2;
}
if (ntlmssp_state->use_ntlmv2) {
flags |= CLI_CRED_NTLMv2_AUTH;
}
if (ntlmssp_state->use_nt_response) {
flags |= CLI_CRED_NTLM_AUTH;
}
if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) {
flags |= CLI_CRED_LANMAN_AUTH;
}
nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
&flags, challenge_blob, target_info,
&lm_response, &nt_response,
&lm_session_key, &session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
if (!(flags & CLI_CRED_LANMAN_AUTH)) {
/* LM Key is still possible, just silly, so we do not
* allow it. Fortunetly all LM crypto is off by
* default and we require command line options to end
* up here */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
if (!(flags & CLI_CRED_NTLM2)) {
/* NTLM2 is incompatible... */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
}
if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
&& lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
DATA_BLOB new_session_key = data_blob_talloc(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 {
static const uint8_t zeros[24];
SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
new_session_key.data);
}
session_key = new_session_key;
dump_data_pw("LM session key\n", session_key.data, session_key.length);
}
/* Key exchange encryptes a new client-generated session key with
the password-derived key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
/* Make up a new session key */
uint8_t client_session_key[16];
generate_secret_buffer(client_session_key, sizeof(client_session_key));
/* Encrypt the new session key with the old one */
encrypted_session_key = data_blob_talloc(ntlmssp_state,
client_session_key, sizeof(client_session_key));
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
/* Mark the new session key as the 'real' session key */
session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
}
/* this generates the actual auth packet */
nt_status = msrpc_gen(mem_ctx,
out, auth_gen_string,
"NTLMSSP",
NTLMSSP_AUTH,
lm_response.data, lm_response.length,
nt_response.data, nt_response.length,
domain,
user,
workstation,
encrypted_session_key.data, encrypted_session_key.length,
ntlmssp_state->neg_flags,
version_blob.data, version_blob.length);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
done:
ntlmssp_state->session_key = session_key;
talloc_steal(ntlmssp_state, session_key.data);
DEBUG(3, ("NTLMSSP: Set final flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
talloc_steal(out_mem_ctx, out->data);
ntlmssp_state->expected_state = NTLMSSP_DONE;
if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
nt_status = ntlmssp_sign_init(ntlmssp_state);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
nt_errstr(nt_status)));
talloc_free(mem_ctx);
return nt_status;
}
}
talloc_free(mem_ctx);
return NT_STATUS_OK;
}