diff options
Diffstat (limited to 'source/auth/auth_sam.c')
| -rw-r--r-- | source/auth/auth_sam.c | 367 |
1 files changed, 219 insertions, 148 deletions
diff --git a/source/auth/auth_sam.c b/source/auth/auth_sam.c index 7352a9685be..04b587343a3 100644 --- a/source/auth/auth_sam.c +++ b/source/auth/auth_sam.c @@ -141,96 +141,129 @@ static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response, return (memcmp(value_from_encryption, client_response, 16) == 0); } -/**************************************************************************** - Do a specific test for an smb password being correct, given a smb_password and - the lanman and NT responses. -****************************************************************************/ - -static NTSTATUS sam_password_ok(const struct auth_context *auth_context, - TALLOC_CTX *mem_ctx, - SAM_ACCOUNT *sampass, - const auth_usersupplied_info *user_info, - DATA_BLOB *user_sess_key, - DATA_BLOB *lm_sess_key) +/** + * 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 nt_pw MD4 unicode password from our passdb or similar + * @param lm_pw LANMAN ASCII 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) + */ + +static NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx, + 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 uint8 *lm_pw, const uint8 *nt_pw, + DATA_BLOB *user_sess_key, + DATA_BLOB *lm_sess_key) { - uint16 acct_ctrl; - const uint8 *nt_pw, *lm_pw; - uint32 auth_flags; - - acct_ctrl = pdb_get_acct_ctrl(sampass); - if (acct_ctrl & ACB_PWNOTREQ) { - if (lp_null_passwords()) { - DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass))); - return(NT_STATUS_OK); - } else { - DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass))); - return(NT_STATUS_LOGON_FAILURE); - } + static const unsigned char zeros[8]; + if (nt_pw == NULL) { + DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n", + username)); } - auth_flags = user_info->auth_flags; + /* Check for cleartext netlogon. Used by Exchange 5.5. */ + if (challenge->length == sizeof(zeros) && + (memcmp(challenge->data, zeros, challenge->length) == 0 )) { - if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) { - DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n", - pdb_get_username(sampass))); - /* No return, we want to check the LM hash below in this case */ - auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP | AUTH_FLAG_NTLM_RESP)); - } else { - /* Check for cleartext netlogon. Used by Exchange 5.5. */ - unsigned char zeros[8]; - - memset(zeros,'\0',sizeof(zeros)); - if (auth_context->challenge.length == sizeof(zeros) && - (memcmp(auth_context->challenge.data, zeros, auth_context->challenge.length) == 0 ) && - user_info->nt_resp.length) { - if ((nt_pw = pdb_get_nt_passwd(sampass)) != NULL) { - unsigned char pwhash[16]; - mdfour(pwhash, user_info->nt_resp.data, user_info->nt_resp.length); - if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) { - return NT_STATUS_OK; - } + DEBUG(4,("sam_password_ok: checking plaintext passwords for user %s\n", + username)); + if (nt_pw && nt_response->length) { + unsigned char pwhash[16]; + mdfour(pwhash, nt_response->data, nt_response->length); + if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) { + return NT_STATUS_OK; + } else { + DEBUG(3,("sam_password_ok: NT (Unicode) plaintext password check failed for user %s\n", + username)); + return NT_STATUS_WRONG_PASSWORD; + } + + } else if (!lp_lanman_auth()) { + DEBUG(3,("sam_password_ok: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n", + username)); + + } else if (lm_pw && lm_response->length) { + uchar dospwd[14]; + uchar p16[16]; + ZERO_STRUCT(dospwd); + + DEBUG(100, ("DOS password: %s\n")); + memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd))); + /* Only the fisrt 14 chars are considered, password need not be null terminated. */ + E_P16((const unsigned char *)dospwd, p16); + + dump_data_pw("DOS password (first buffer)\n", dospwd, 14); + dump_data_pw("DOS password (wire DES hash)\n", p16, 16); + dump_data_pw("DOS password (passdb DES hash)\n", lm_pw, 16); + if (memcmp(p16, lm_pw, sizeof(p16)) == 0) { + return NT_STATUS_OK; + } else { + DEBUG(3,("sam_password_ok: LANMAN (ASCII) plaintext password check failed for user %s\n", + username)); + return NT_STATUS_WRONG_PASSWORD; } + } else { + DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username)); + return NT_STATUS_WRONG_PASSWORD; } } + + if (nt_response->length != 0 && nt_response->length < 24) { + DEBUG(2,("sam_password_ok: invalid NT password length (%lu) for user %s\n", + (unsigned long)nt_response->length, username)); + } - if (auth_flags & AUTH_FLAG_NTLMv2_RESP) { - nt_pw = pdb_get_nt_passwd(sampass); - /* We have the NT MD4 hash challenge available - see if we can - use it (ie. does it exist in the smbpasswd file). - */ - DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info->client_domain.str)); - if (smb_pwd_check_ntlmv2( &user_info->nt_resp, - nt_pw, &auth_context->challenge, - user_info->smb_name.str, - user_info->client_domain.str, - user_sess_key)) { - return NT_STATUS_OK; + if (nt_response->length >= 24 && nt_pw) { + if (nt_response->length > 24) { + /* We have the NT MD4 hash challenge available - see if we can + use it (ie. does it exist in the smbpasswd file). + */ + DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", client_domain)); + if (smb_pwd_check_ntlmv2( nt_response, + nt_pw, challenge, + client_username, + client_domain, + user_sess_key)) { + return NT_STATUS_OK; + } + + DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n")); + if (smb_pwd_check_ntlmv2( nt_response, + nt_pw, challenge, + client_username, + "", + user_sess_key)) { + return NT_STATUS_OK; + } else { + DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n")); + return NT_STATUS_WRONG_PASSWORD; + } } - DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n")); - if (smb_pwd_check_ntlmv2( &user_info->nt_resp, - nt_pw, &auth_context->challenge, - user_info->smb_name.str, - "", - user_sess_key)) { - return NT_STATUS_OK; - } else { - DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n")); - return NT_STATUS_WRONG_PASSWORD; - } - } else if (auth_flags & AUTH_FLAG_NTLM_RESP) { if (lp_ntlm_auth()) { - nt_pw = pdb_get_nt_passwd(sampass); /* We have the NT MD4 hash challenge available - see if we can use it (ie. does it exist in the smbpasswd file). */ DEBUG(4,("sam_password_ok: Checking NT MD4 password\n")); - if (smb_pwd_check_ntlmv1(&user_info->nt_resp, - nt_pw, &auth_context->challenge, + if (smb_pwd_check_ntlmv1(nt_response, + nt_pw, 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 */ - lm_pw = pdb_get_lanman_passwd(sampass); if (lp_lanman_auth() && lm_pw) { uint8 first_8_lm_hash[16]; @@ -240,104 +273,142 @@ static NTSTATUS sam_password_ok(const struct auth_context *auth_context, } return NT_STATUS_OK; } else { - DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass))); + DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n", + username)); return NT_STATUS_WRONG_PASSWORD; } } else { - DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass))); + DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n", + username)); /* no return, becouse we might pick up LMv2 in the LM field */ } } - if (auth_flags & AUTH_FLAG_LM_RESP) { - if (user_info->lm_resp.length != 24) { - DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n", - (unsigned long)user_info->nt_resp.length, pdb_get_username(sampass))); - } + if (lm_response->length == 0) { + DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n", + username)); + return NT_STATUS_WRONG_PASSWORD; + } + + if (lm_response->length < 24) { + DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n", + (unsigned long)nt_response->length, username)); + return NT_STATUS_WRONG_PASSWORD; + } - if (!lp_lanman_auth()) { - DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass))); - } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) { - DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass))); - } else { - lm_pw = pdb_get_lanman_passwd(sampass); - - DEBUG(4,("sam_password_ok: Checking LM password\n")); - if (smb_pwd_check_ntlmv1(&user_info->lm_resp, - lm_pw, &auth_context->challenge, - NULL)) { + if (!lp_lanman_auth()) { + DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n", + username)); + } else if (!lm_pw) { + DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n", + username)); + } else { + DEBUG(4,("sam_password_ok: Checking LM password\n")); + if (smb_pwd_check_ntlmv1(lm_response, + lm_pw, challenge, + NULL)) { + uint8 first_8_lm_hash[16]; + memcpy(first_8_lm_hash, lm_pw, 8); + memset(first_8_lm_hash + 8, '\0', 8); + *user_sess_key = data_blob(first_8_lm_hash, 16); + *lm_sess_key = data_blob(first_8_lm_hash, 16); + return NT_STATUS_OK; + } + } + + if (!nt_pw) { + DEBUG(4,("sam_password_ok: 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,("sam_password_ok: Checking LMv2 password with domain %s\n", client_domain)); + if (smb_pwd_check_ntlmv2( lm_response, + nt_pw, challenge, + client_username, + client_domain, + NULL)) { + return NT_STATUS_OK; + } + + DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n")); + if (smb_pwd_check_ntlmv2( lm_response, + nt_pw, challenge, + client_username, + "", + NULL)) { + 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,("sam_password_ok: Checking NT MD4 password in LM field\n")); + if (lp_ntlm_auth()) { + if (smb_pwd_check_ntlmv1(lm_response, + nt_pw, 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 (lp_lanman_auth() && lm_pw) { uint8 first_8_lm_hash[16]; memcpy(first_8_lm_hash, lm_pw, 8); memset(first_8_lm_hash + 8, '\0', 8); *user_sess_key = data_blob(first_8_lm_hash, 16); *lm_sess_key = data_blob(first_8_lm_hash, 16); - return NT_STATUS_OK; } - } - - if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) { - DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass))); - return NT_STATUS_WRONG_PASSWORD; - } - - nt_pw = pdb_get_nt_passwd(sampass); - - /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes. - - related to Win9X, legacy NAS pass-though authentication - */ - DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str)); - if (smb_pwd_check_ntlmv2( &user_info->lm_resp, - nt_pw, &auth_context->challenge, - user_info->smb_name.str, - user_info->client_domain.str, - NULL)) { return NT_STATUS_OK; } + DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username)); + } else { + DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username)); + } + return NT_STATUS_WRONG_PASSWORD; +} - DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n")); - if (smb_pwd_check_ntlmv2( &user_info->lm_resp, - nt_pw, &auth_context->challenge, - user_info->smb_name.str, - "", - NULL)) { - return NT_STATUS_OK; - } +/**************************************************************************** + Do a specific test for an smb password being correct, given a smb_password and + the lanman and NT responses. +****************************************************************************/ - /* Apparently NT accepts NT responses in the LM field - - I think this is related to Win9X pass-though authentication - */ - DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n")); - if (lp_ntlm_auth()) { - if (smb_pwd_check_ntlmv1(&user_info->lm_resp, - nt_pw, &auth_context->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 */ - lm_pw = pdb_get_lanman_passwd(sampass); - - if (lp_lanman_auth() && lm_pw) { - uint8 first_8_lm_hash[16]; - memcpy(first_8_lm_hash, lm_pw, 8); - memset(first_8_lm_hash + 8, '\0', 8); - *user_sess_key = data_blob(first_8_lm_hash, 16); - *lm_sess_key = data_blob(first_8_lm_hash, 16); - } - return NT_STATUS_OK; - } - DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass))); - return NT_STATUS_WRONG_PASSWORD; +static NTSTATUS sam_password_ok(const struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, + SAM_ACCOUNT *sampass, + const auth_usersupplied_info *user_info, + DATA_BLOB *user_sess_key, + DATA_BLOB *lm_sess_key) +{ + uint16 acct_ctrl; + const uint8 *lm_pw, *nt_pw; + const char *username = pdb_get_username(sampass); + + acct_ctrl = pdb_get_acct_ctrl(sampass); + if (acct_ctrl & ACB_PWNOTREQ) { + if (lp_null_passwords()) { + DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username)); + return NT_STATUS_OK; } else { - DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",pdb_get_username(sampass))); - return NT_STATUS_WRONG_PASSWORD; - } + DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username)); + return NT_STATUS_LOGON_FAILURE; + } } - - /* Should not be reached, but if they send nothing... */ - DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass))); - return NT_STATUS_WRONG_PASSWORD; + + lm_pw = pdb_get_lanman_passwd(sampass); + nt_pw = pdb_get_nt_passwd(sampass); + + return ntlm_password_check(mem_ctx, &auth_context->challenge, + &user_info->lm_resp, &user_info->nt_resp, + username, + user_info->smb_name.str, + user_info->client_domain.str, + lm_pw, nt_pw, user_sess_key, lm_sess_key); } + /**************************************************************************** Do a specific test for a SAM_ACCOUNT being vaild for this connection (ie not disabled, expired and the like). |