diff options
Diffstat (limited to 'source4/auth/ntlm')
| -rw-r--r-- | source4/auth/ntlm/ntlm_check.c | 603 |
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; -} - |