summaryrefslogtreecommitdiff
path: root/source4/auth/ntlm/ntlm_check.c
diff options
context:
space:
mode:
Diffstat (limited to 'source4/auth/ntlm/ntlm_check.c')
-rw-r--r--source4/auth/ntlm/ntlm_check.c603
1 files changed, 0 insertions, 603 deletions
diff --git a/source4/auth/ntlm/ntlm_check.c b/source4/auth/ntlm/ntlm_check.c
deleted file mode 100644
index 0805b1b043..0000000000
--- a/source4/auth/ntlm/ntlm_check.c
+++ /dev/null
@@ -1,603 +0,0 @@
-/*
- Unix SMB/CIFS implementation.
- Password and authentication handling
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
- Copyright (C) Gerald Carter 2003
- Copyright (C) Luke Kenneth Casson Leighton 1996-2000
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "includes.h"
-#include "../lib/crypto/crypto.h"
-#include "librpc/gen_ndr/netlogon.h"
-#include "libcli/auth/libcli_auth.h"
-#include "auth/ntlm/ntlm_check.h"
-
-/****************************************************************************
- Core of smb password checking routine.
-****************************************************************************/
-
-static bool smb_pwd_check_ntlmv1(TALLOC_CTX *mem_ctx,
- const DATA_BLOB *nt_response,
- const uint8_t *part_passwd,
- const DATA_BLOB *sec_blob,
- DATA_BLOB *user_sess_key)
-{
- /* Finish the encryption of part_passwd. */
- uint8_t p24[24];
-
- if (part_passwd == NULL) {
- DEBUG(10,("No password set - DISALLOWING access\n"));
- /* No password set - always false ! */
- return false;
- }
-
- if (sec_blob->length != 8) {
- DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n",
- (unsigned long)sec_blob->length));
- return false;
- }
-
- if (nt_response->length != 24) {
- DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n",
- (unsigned long)nt_response->length));
- return false;
- }
-
- SMBOWFencrypt(part_passwd, sec_blob->data, p24);
-
-#if DEBUG_PASSWORD
- DEBUG(100,("Part password (P16) was |\n"));
- dump_data(100, part_passwd, 16);
- DEBUGADD(100,("Password from client was |\n"));
- dump_data(100, nt_response->data, nt_response->length);
- DEBUGADD(100,("Given challenge was |\n"));
- dump_data(100, sec_blob->data, sec_blob->length);
- DEBUGADD(100,("Value from encryption was |\n"));
- dump_data(100, p24, 24);
-#endif
- if (memcmp(p24, nt_response->data, 24) == 0) {
- if (user_sess_key != NULL) {
- *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
- SMBsesskeygen_ntv1(part_passwd, user_sess_key->data);
- }
- return true;
- }
- return false;
-}
-
-/****************************************************************************
- Core of smb password checking routine. (NTLMv2, LMv2)
- Note: The same code works with both NTLMv2 and LMv2.
-****************************************************************************/
-
-static bool smb_pwd_check_ntlmv2(TALLOC_CTX *mem_ctx,
- const DATA_BLOB *ntv2_response,
- const uint8_t *part_passwd,
- const DATA_BLOB *sec_blob,
- const char *user, const char *domain,
- bool upper_case_domain, /* should the domain be transformed into upper case? */
- DATA_BLOB *user_sess_key)
-{
- /* Finish the encryption of part_passwd. */
- uint8_t kr[16];
- uint8_t value_from_encryption[16];
- DATA_BLOB client_key_data;
-
- if (part_passwd == NULL) {
- DEBUG(10,("No password set - DISALLOWING access\n"));
- /* No password set - always false */
- return false;
- }
-
- if (sec_blob->length != 8) {
- DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n",
- (unsigned long)sec_blob->length));
- return false;
- }
-
- if (ntv2_response->length < 24) {
- /* We MUST have more than 16 bytes, or the stuff below will go
- crazy. No known implementation sends less than the 24 bytes
- for LMv2, let alone NTLMv2. */
- DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
- (unsigned long)ntv2_response->length));
- return false;
- }
-
- client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
- /*
- todo: should we be checking this for anything? We can't for LMv2,
- but for NTLMv2 it is meant to contain the current time etc.
- */
-
- if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
- return false;
- }
-
- SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
-
-#if DEBUG_PASSWORD
- DEBUG(100,("Part password (P16) was |\n"));
- dump_data(100, part_passwd, 16);
- DEBUGADD(100,("Password from client was |\n"));
- dump_data(100, ntv2_response->data, ntv2_response->length);
- DEBUGADD(100,("Variable data from client was |\n"));
- dump_data(100, client_key_data.data, client_key_data.length);
- DEBUGADD(100,("Given challenge was |\n"));
- dump_data(100, sec_blob->data, sec_blob->length);
- DEBUGADD(100,("Value from encryption was |\n"));
- dump_data(100, value_from_encryption, 16);
-#endif
- data_blob_clear_free(&client_key_data);
- if (memcmp(value_from_encryption, ntv2_response->data, 16) == 0) {
- if (user_sess_key != NULL) {
- *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
- SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
- }
- return true;
- }
- return false;
-}
-
-/****************************************************************************
- Core of smb password checking routine. (NTLMv2, LMv2)
- Note: The same code works with both NTLMv2 and LMv2.
-****************************************************************************/
-
-static bool smb_sess_key_ntlmv2(TALLOC_CTX *mem_ctx,
- const DATA_BLOB *ntv2_response,
- const uint8_t *part_passwd,
- const DATA_BLOB *sec_blob,
- const char *user, const char *domain,
- bool upper_case_domain, /* should the domain be transformed into upper case? */
- DATA_BLOB *user_sess_key)
-{
- /* Finish the encryption of part_passwd. */
- uint8_t kr[16];
- uint8_t value_from_encryption[16];
- DATA_BLOB client_key_data;
-
- if (part_passwd == NULL) {
- DEBUG(10,("No password set - DISALLOWING access\n"));
- /* No password set - always false */
- return false;
- }
-
- if (sec_blob->length != 8) {
- DEBUG(0, ("smb_sess_key_ntlmv2: incorrect challenge size (%lu)\n",
- (unsigned long)sec_blob->length));
- return false;
- }
-
- if (ntv2_response->length < 24) {
- /* We MUST have more than 16 bytes, or the stuff below will go
- crazy. No known implementation sends less than the 24 bytes
- for LMv2, let alone NTLMv2. */
- DEBUG(0, ("smb_sess_key_ntlmv2: incorrect password length (%lu)\n",
- (unsigned long)ntv2_response->length));
- return false;
- }
-
- client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
-
- if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
- return false;
- }
-
- SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
- *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
- SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
- return true;
-}
-
-/**
- * Compare password hashes against those from the SAM
- *
- * @param mem_ctx talloc context
- * @param client_lanman LANMAN password hash, as supplied by the client
- * @param client_nt NT (MD4) password hash, as supplied by the client
- * @param username internal Samba username, for log messages
- * @param client_username username the client used
- * @param client_domain domain name the client used (may be mapped)
- * @param stored_lanman LANMAN password hash, as stored on the SAM
- * @param stored_nt NT (MD4) password hash, as stored on the SAM
- * @param user_sess_key User session key
- * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
- */
-
-NTSTATUS hash_password_check(TALLOC_CTX *mem_ctx,
- bool lanman_auth,
- const struct samr_Password *client_lanman,
- const struct samr_Password *client_nt,
- const char *username,
- const struct samr_Password *stored_lanman,
- const struct samr_Password *stored_nt)
-{
- if (stored_nt == NULL) {
- DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
- username));
- }
-
- if (client_nt && stored_nt) {
- if (memcmp(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash)) == 0) {
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- } else if (client_lanman && stored_lanman) {
- if (!lanman_auth) {
- DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- if (strchr_m(username, '@')) {
- return NT_STATUS_NOT_FOUND;
- }
-
- if (memcmp(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash)) == 0) {
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- }
- if (strchr_m(username, '@')) {
- return NT_STATUS_NOT_FOUND;
- }
- return NT_STATUS_WRONG_PASSWORD;
-}
-
-/**
- * Check a challenge-response password against the value of the NT or
- * LM password hash.
- *
- * @param mem_ctx talloc context
- * @param challenge 8-byte challenge. If all zero, forces plaintext comparison
- * @param nt_response 'unicode' NT response to the challenge, or unicode password
- * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
- * @param username internal Samba username, for log messages
- * @param client_username username the client used
- * @param client_domain domain name the client used (may be mapped)
- * @param stored_lanman LANMAN ASCII password from our passdb or similar
- * @param stored_nt MD4 unicode password from our passdb or similar
- * @param user_sess_key User session key
- * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
- */
-
-NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
- bool lanman_auth,
- bool ntlm_auth,
- uint32_t logon_parameters,
- const DATA_BLOB *challenge,
- const DATA_BLOB *lm_response,
- const DATA_BLOB *nt_response,
- const char *username,
- const char *client_username,
- const char *client_domain,
- const struct samr_Password *stored_lanman,
- const struct samr_Password *stored_nt,
- DATA_BLOB *user_sess_key,
- DATA_BLOB *lm_sess_key)
-{
- const static uint8_t zeros[8];
- DATA_BLOB tmp_sess_key;
-
- if (stored_nt == NULL) {
- DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
- username));
- }
-
- *lm_sess_key = data_blob(NULL, 0);
- *user_sess_key = data_blob(NULL, 0);
-
- /* Check for cleartext netlogon. Used by Exchange 5.5. */
- if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
- && challenge->length == sizeof(zeros)
- && (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
- struct samr_Password client_nt;
- struct samr_Password client_lm;
- char *unix_pw = NULL;
- bool lm_ok;
-
- DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
- username));
- mdfour(client_nt.hash, nt_response->data, nt_response->length);
-
- if (lm_response->length &&
- (convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
- lm_response->data, lm_response->length,
- (void **)&unix_pw, NULL, false))) {
- if (E_deshash(unix_pw, client_lm.hash)) {
- lm_ok = true;
- } else {
- lm_ok = false;
- }
- } else {
- lm_ok = false;
- }
- return hash_password_check(mem_ctx,
- lanman_auth,
- lm_ok ? &client_lm : NULL,
- nt_response->length ? &client_nt : NULL,
- username,
- stored_lanman, stored_nt);
- }
-
- if (nt_response->length != 0 && nt_response->length < 24) {
- DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
- (unsigned long)nt_response->length, username));
- }
-
- if (nt_response->length > 24 && stored_nt) {
- /* We have the NT MD4 hash challenge available - see if we can
- use it
- */
- DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- false,
- user_sess_key)) {
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- true,
- user_sess_key)) {
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- "",
- false,
- user_sess_key)) {
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
- }
- } else if (nt_response->length == 24 && stored_nt) {
- if (ntlm_auth) {
- /* We have the NT MD4 hash challenge available - see if we can
- use it (ie. does it exist in the smbpasswd file).
- */
- DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
- if (smb_pwd_check_ntlmv1(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- user_sess_key)) {
- /* The LM session key for this response is not very secure,
- so use it only if we otherwise allow LM authentication */
-
- if (lanman_auth && stored_lanman) {
- *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
- }
- return NT_STATUS_OK;
- } else {
- DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
- } else {
- DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
- username));
- /* no return, becouse we might pick up LMv2 in the LM field */
- }
- }
-
- if (lm_response->length == 0) {
- DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
- username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- if (lm_response->length < 24) {
- DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
- (unsigned long)nt_response->length, username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- if (!lanman_auth) {
- DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
- username));
- } else if (!stored_lanman) {
- DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
- username));
- } else if (strchr_m(username, '@')) {
- DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
- username));
- } else {
- DEBUG(4,("ntlm_password_check: Checking LM password\n"));
- if (smb_pwd_check_ntlmv1(mem_ctx,
- lm_response,
- stored_lanman->hash, challenge,
- NULL)) {
- /* The session key for this response is still very odd.
- It not very secure, so use it only if we otherwise
- allow LM authentication */
-
- if (lanman_auth && stored_lanman) {
- uint8_t first_8_lm_hash[16];
- memcpy(first_8_lm_hash, stored_lanman->hash, 8);
- memset(first_8_lm_hash + 8, '\0', 8);
- *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
- *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
- }
- return NT_STATUS_OK;
- }
- }
-
- if (!stored_nt) {
- DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
- return NT_STATUS_WRONG_PASSWORD;
- }
-
- /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
- - related to Win9X, legacy NAS pass-though authentication
- */
- DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- lm_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- false,
- &tmp_sess_key)) {
- if (nt_response->length > 24) {
- /* If NTLMv2 authentication has preceeded us
- * (even if it failed), then use the session
- * key from that. See the RPC-SAMLOGON
- * torture test */
- smb_sess_key_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- false,
- user_sess_key);
- } else {
- /* Otherwise, use the LMv2 session key */
- *user_sess_key = tmp_sess_key;
- }
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- lm_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- true,
- &tmp_sess_key)) {
- if (nt_response->length > 24) {
- /* If NTLMv2 authentication has preceeded us
- * (even if it failed), then use the session
- * key from that. See the RPC-SAMLOGON
- * torture test */
- smb_sess_key_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- client_domain,
- true,
- user_sess_key);
- } else {
- /* Otherwise, use the LMv2 session key */
- *user_sess_key = tmp_sess_key;
- }
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- }
-
- DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
- if (smb_pwd_check_ntlmv2(mem_ctx,
- lm_response,
- stored_nt->hash, challenge,
- client_username,
- "",
- false,
- &tmp_sess_key)) {
- if (nt_response->length > 24) {
- /* If NTLMv2 authentication has preceeded us
- * (even if it failed), then use the session
- * key from that. See the RPC-SAMLOGON
- * torture test */
- smb_sess_key_ntlmv2(mem_ctx,
- nt_response,
- stored_nt->hash, challenge,
- client_username,
- "",
- false,
- user_sess_key);
- } else {
- /* Otherwise, use the LMv2 session key */
- *user_sess_key = tmp_sess_key;
- }
- *lm_sess_key = *user_sess_key;
- if (user_sess_key->length) {
- lm_sess_key->length = 8;
- }
- return NT_STATUS_OK;
- }
-
- /* Apparently NT accepts NT responses in the LM field
- - I think this is related to Win9X pass-though authentication
- */
- DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
- if (ntlm_auth) {
- if (smb_pwd_check_ntlmv1(mem_ctx,
- lm_response,
- stored_nt->hash, challenge,
- NULL)) {
- /* The session key for this response is still very odd.
- It not very secure, so use it only if we otherwise
- allow LM authentication */
-
- if (lanman_auth && stored_lanman) {
- uint8_t first_8_lm_hash[16];
- memcpy(first_8_lm_hash, stored_lanman->hash, 8);
- memset(first_8_lm_hash + 8, '\0', 8);
- *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
- *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
- }
- return NT_STATUS_OK;
- }
- DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
- } else {
- DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
- }
-
- /* Try and match error codes */
- if (strchr_m(username, '@')) {
- return NT_STATUS_NOT_FOUND;
- }
- return NT_STATUS_WRONG_PASSWORD;
-}
-