diff options
Diffstat (limited to 'source4')
| -rw-r--r-- | source4/auth/ntlmssp/ntlmssp_server.c | 521 |
1 files changed, 1 insertions, 520 deletions
diff --git a/source4/auth/ntlmssp/ntlmssp_server.c b/source4/auth/ntlmssp/ntlmssp_server.c index ce76e3919b..352f8754d6 100644 --- a/source4/auth/ntlmssp/ntlmssp_server.c +++ b/source4/auth/ntlmssp/ntlmssp_server.c @@ -27,6 +27,7 @@ #include "auth/ntlmssp/ntlmssp.h" #include "../librpc/gen_ndr/ndr_ntlmssp.h" #include "../libcli/auth/ntlmssp_ndr.h" +#include "../libcli/auth/ntlmssp_private.h" #include "../libcli/auth/libcli_auth.h" #include "../lib/crypto/crypto.h" #include "auth/gensec/gensec.h" @@ -35,526 +36,6 @@ #include "param/param.h" /** - * Next state function for the Negotiate packet - * - * @param ntlmssp_state NTLMSSP state - * @param out_mem_ctx Memory context for *out - * @param in The request, as a DATA_BLOB. reply.data must be NULL - * @param out The reply, as an allocated DATA_BLOB, caller to free. - * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. - */ - -NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state, - TALLOC_CTX *out_mem_ctx, - const DATA_BLOB request, DATA_BLOB *reply) -{ - DATA_BLOB struct_blob; - uint32_t neg_flags = 0; - uint32_t ntlmssp_command, chal_flags; - uint8_t cryptkey[8]; - const char *target_name; - NTSTATUS status; - - /* parse the NTLMSSP packet */ -#if 0 - file_save("ntlmssp_negotiate.dat", request.data, request.length); -#endif - - if (request.length) { - if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd", - "NTLMSSP", - &ntlmssp_command, - &neg_flags)) { - DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n", - (unsigned int)request.length)); - dump_data(2, request.data, request.length); - return NT_STATUS_INVALID_PARAMETER; - } - debug_ntlmssp_flags(neg_flags); - - if (DEBUGLEVEL >= 10) { - struct NEGOTIATE_MESSAGE *negotiate = talloc( - ntlmssp_state, struct NEGOTIATE_MESSAGE); - if (negotiate != NULL) { - status = ntlmssp_pull_NEGOTIATE_MESSAGE( - &request, negotiate, negotiate); - if (NT_STATUS_IS_OK(status)) { - NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, - negotiate); - } - TALLOC_FREE(negotiate); - } - } - } - - ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key); - - /* Ask our caller what challenge they would like in the packet */ - status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey); - if (!NT_STATUS_IS_OK(status)) { - DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n", - nt_errstr(status))); - return status; - } - - /* Check if we may set the challenge */ - if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) { - ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2; - } - - /* The flags we send back are not just the negotiated flags, - * they are also 'what is in this packet'. Therfore, we - * operate on 'chal_flags' from here on - */ - - chal_flags = ntlmssp_state->neg_flags; - - /* get the right name to fill in as 'target' */ - target_name = ntlmssp_target_name(ntlmssp_state, - neg_flags, &chal_flags); - if (target_name == NULL) - return NT_STATUS_INVALID_PARAMETER; - - ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8); - ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state, - cryptkey, 8); - - /* This creates the 'blob' of names that appears at the end of the packet */ - if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) - { - msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa", - MsvAvNbDomainName, target_name, - MsvAvNbComputerName, ntlmssp_state->server.netbios_name, - MsvAvDnsDomainName, ntlmssp_state->server.dns_domain, - MsvAvDnsComputerName, ntlmssp_state->server.dns_name, - MsvAvEOL, ""); - } else { - struct_blob = data_blob_null; - } - - { - /* Marshal the packet in the right format, be it unicode or ASCII */ - const char *gen_string; - DATA_BLOB version_blob = data_blob_null; - - if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) { - enum ndr_err_code err; - struct VERSION vers; - - /* "What Windows returns" as a version number. */ - ZERO_STRUCT(vers); - vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6; - vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1; - vers.ProductBuild = 0; - vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; - - err = ndr_push_struct_blob(&version_blob, - ntlmssp_state, - &vers, - (ndr_push_flags_fn_t)ndr_push_VERSION); - - if (!NDR_ERR_CODE_IS_SUCCESS(err)) { - data_blob_free(&struct_blob); - return NT_STATUS_NO_MEMORY; - } - } - - if (ntlmssp_state->unicode) { - gen_string = "CdUdbddBb"; - } else { - gen_string = "CdAdbddBb"; - } - - msrpc_gen(out_mem_ctx, reply, gen_string, - "NTLMSSP", - NTLMSSP_CHALLENGE, - target_name, - chal_flags, - cryptkey, 8, - 0, 0, - struct_blob.data, struct_blob.length, - version_blob.data, version_blob.length); - - data_blob_free(&version_blob); - - if (DEBUGLEVEL >= 10) { - struct CHALLENGE_MESSAGE *challenge = talloc( - ntlmssp_state, struct CHALLENGE_MESSAGE); - if (challenge != NULL) { - 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(&struct_blob); - - ntlmssp_state->expected_state = NTLMSSP_AUTH; - - return NT_STATUS_MORE_PROCESSING_REQUIRED; -} - -struct ntlmssp_server_auth_state { - DATA_BLOB user_session_key; - DATA_BLOB lm_session_key; - /* internal variables used by KEY_EXCH (client-supplied user session key */ - DATA_BLOB encrypted_session_key; - bool doing_ntlm2; - /* internal variables used by NTLM2 */ - uint8_t session_nonce[16]; -}; - -/** - * Next state function for the Authenticate packet - * - * @param ntlmssp_state NTLMSSP State - * @param request The request, as a DATA_BLOB - * @return Errors or NT_STATUS_OK. - */ - -static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state, - struct ntlmssp_server_auth_state *state, - const DATA_BLOB request) -{ - uint32_t ntlmssp_command, auth_flags; - NTSTATUS nt_status; - - uint8_t session_nonce_hash[16]; - - const char *parse_string; - -#if 0 - file_save("ntlmssp_auth.dat", request.data, request.length); -#endif - - if (ntlmssp_state->unicode) { - parse_string = "CdBBUUUBd"; - } else { - parse_string = "CdBBAAABd"; - } - - /* zero these out */ - data_blob_free(&ntlmssp_state->session_key); - data_blob_free(&ntlmssp_state->lm_resp); - data_blob_free(&ntlmssp_state->nt_resp); - - ntlmssp_state->user = NULL; - ntlmssp_state->domain = NULL; - ntlmssp_state->client.netbios_name = NULL; - - /* now the NTLMSSP encoded auth hashes */ - if (!msrpc_parse(ntlmssp_state, &request, parse_string, - "NTLMSSP", - &ntlmssp_command, - &ntlmssp_state->lm_resp, - &ntlmssp_state->nt_resp, - &ntlmssp_state->domain, - &ntlmssp_state->user, - &ntlmssp_state->client.netbios_name, - &state->encrypted_session_key, - &auth_flags)) { - DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n")); - dump_data(10, request.data, request.length); - - /* zero this out */ - data_blob_free(&state->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(ntlmssp_state, &request, parse_string, - "NTLMSSP", - &ntlmssp_command, - &ntlmssp_state->lm_resp, - &ntlmssp_state->nt_resp, - &ntlmssp_state->domain, - &ntlmssp_state->user, - &ntlmssp_state->client.netbios_name)) { - DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n")); - dump_data(2, request.data, request.length); - - return NT_STATUS_INVALID_PARAMETER; - } - } - - talloc_steal(state, state->encrypted_session_key.data); - - if (auth_flags) - ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key); - - if (DEBUGLEVEL >= 10) { - struct AUTHENTICATE_MESSAGE *authenticate = talloc( - ntlmssp_state, struct AUTHENTICATE_MESSAGE); - if (authenticate != NULL) { - NTSTATUS status; - authenticate->NegotiateFlags = auth_flags; - status = ntlmssp_pull_AUTHENTICATE_MESSAGE( - &request, authenticate, authenticate); - if (NT_STATUS_IS_OK(status)) { - NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, - authenticate); - } - TALLOC_FREE(authenticate); - } - } - - DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n", - ntlmssp_state->user, ntlmssp_state->domain, - ntlmssp_state->client.netbios_name, - (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; - state->doing_ntlm2 = true; - - memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8); - memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8); - - SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8); - - MD5Init(&md5_session_nonce_ctx); - MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16); - MD5Final(session_nonce_hash, &md5_session_nonce_ctx); - - ntlmssp_state->chal = data_blob_talloc( - ntlmssp_state, 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))) { - return nt_status; - } - - /* LM Key is incompatible. */ - ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; - } - } - return NT_STATUS_OK; -} - -/** - * Next state function for the Authenticate packet - * (after authentication - figures out the session keys etc) - * - * @param ntlmssp_state NTLMSSP State - * @return Errors or NT_STATUS_OK. - */ - -static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state, - struct ntlmssp_server_auth_state *state) -{ - DATA_BLOB user_session_key = state->user_session_key; - DATA_BLOB lm_session_key = state->lm_session_key; - NTSTATUS nt_status; - DATA_BLOB session_key = data_blob(NULL, 0); - - 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 (state->doing_ntlm2) { - if (user_session_key.data && user_session_key.length == 16) { - session_key = data_blob_talloc(ntlmssp_state, - NULL, 16); - hmac_md5(user_session_key.data, state->session_nonce, - sizeof(state->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) - /* Ensure we can never get here on NTLMv2 */ - && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) { - - 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, - 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 { - static const uint8_t zeros[24] = {0, }; - session_key = data_blob_talloc( - ntlmssp_state, NULL, 16); - if (session_key.data == NULL) { - return NT_STATUS_NO_MEMORY; - } - 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; - } - - } 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); - - /* LM Key not selected */ - ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; - - } else if (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; - - /* LM Key not selected */ - ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; - } - - /* 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 (!state->encrypted_session_key.data - || state->encrypted_session_key.length != 16) { - data_blob_free(&state->encrypted_session_key); - DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", - (unsigned)state->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", - state->encrypted_session_key.data, - state->encrypted_session_key.length); - arcfour_crypt(state->encrypted_session_key.data, - session_key.data, - state->encrypted_session_key.length); - ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state, - state->encrypted_session_key.data, - state->encrypted_session_key.length); - dump_data_pw("KEY_EXCH session key:\n", - state->encrypted_session_key.data, - state->encrypted_session_key.length); - talloc_free(session_key.data); - } - } else { - ntlmssp_state->session_key = session_key; - } - - if (ntlmssp_state->session_key.length) { - nt_status = ntlmssp_sign_init(ntlmssp_state); - } - - ntlmssp_state->expected_state = NTLMSSP_DONE; - - return nt_status; -} - - -/** - * Next state function for the Authenticate packet - * - * @param gensec_security GENSEC state - * @param out_mem_ctx Memory context for *out - * @param in The request, as a DATA_BLOB. reply.data must be NULL - * @param out The reply, as an allocated DATA_BLOB, caller to free. - * @return Errors or NT_STATUS_OK if authentication sucessful - */ - -NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state, - TALLOC_CTX *out_mem_ctx, - const DATA_BLOB in, DATA_BLOB *out) -{ - struct ntlmssp_server_auth_state *state; - NTSTATUS nt_status; - - /* zero the outbound NTLMSSP packet */ - *out = data_blob_null; - - state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state); - if (state == NULL) { - return NT_STATUS_NO_MEMORY; - } - - nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in); - if (!NT_STATUS_IS_OK(nt_status)) { - TALLOC_FREE(state); - 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 */ - nt_status = ntlmssp_state->check_password(ntlmssp_state, - &state->user_session_key, - &state->lm_session_key); - if (!NT_STATUS_IS_OK(nt_status)) { - TALLOC_FREE(state); - return nt_status; - } - - /* When we get more async in the auth code behind - ntlmssp_state->check_password, the ntlmssp_server_postpath - can be done in a callback */ - - nt_status = ntlmssp_server_postauth(ntlmssp_state, state); - if (!NT_STATUS_IS_OK(nt_status)) { - TALLOC_FREE(state); - return nt_status; - } - - TALLOC_FREE(state); - return NT_STATUS_OK; -} - -/** * Next state function for the Negotiate packet (GENSEC wrapper) * * @param gensec_security GENSEC state |