/* Unix SMB/CIFS implementation. Password and authentication handling Copyright (C) Andrew Tridgell 1992-2000 Copyright (C) Luke Kenneth Casson Leighton 1996-2000 Copyright (C) Andrew Bartlett 2001-2003 Copyright (C) Gerald Carter 2003 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" #undef DBGC_CLASS #define DBGC_CLASS DBGC_AUTH /**************************************************************************** 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, struct samu *sampass, const auth_usersupplied_info *user_info, DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key) { uint32 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,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username)); return NT_STATUS_LOGON_FAILURE; } } 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, &user_info->lm_interactive_pwd, &user_info->nt_interactive_pwd, username, user_info->smb_name, user_info->client_domain, lm_pw, nt_pw, user_sess_key, lm_sess_key); } /**************************************************************************** Check if a user is allowed to logon at this time. Note this is the servers local time, as logon hours are just specified as a weekly bitmask. ****************************************************************************/ static bool logon_hours_ok(struct samu *sampass) { /* In logon hours first bit is Sunday from 12AM to 1AM */ const uint8 *hours; struct tm *utctime; time_t lasttime; const char *asct; uint8 bitmask, bitpos; hours = pdb_get_hours(sampass); if (!hours) { DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass))); return True; } lasttime = time(NULL); utctime = gmtime(&lasttime); if (!utctime) { DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n", pdb_get_username(sampass) )); return False; } /* find the corresponding byte and bit */ bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168; bitmask = 1 << (bitpos % 8); if (! (hours[bitpos/8] & bitmask)) { struct tm *t = localtime(&lasttime); if (!t) { asct = "INVALID TIME"; } else { asct = asctime(t); if (!asct) { asct = "INVALID TIME"; } } DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to " "logon at this time (%s).\n", pdb_get_username(sampass), asct )); return False; } asct = asctime(utctime); DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n", pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" )); return True; } /**************************************************************************** Do a specific test for a struct samu being valid for this connection (ie not disabled, expired and the like). ****************************************************************************/ static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx, struct samu *sampass, const auth_usersupplied_info *user_info) { uint32 acct_ctrl = pdb_get_acct_ctrl(sampass); char *workstation_list; time_t kickoff_time; DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass))); /* Quit if the account was disabled. */ if (acct_ctrl & ACB_DISABLED) { DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass))); return NT_STATUS_ACCOUNT_DISABLED; } /* Quit if the account was locked out. */ if (acct_ctrl & ACB_AUTOLOCK) { DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass))); return NT_STATUS_ACCOUNT_LOCKED_OUT; } /* Quit if the account is not allowed to logon at this time. */ if (! logon_hours_ok(sampass)) { return NT_STATUS_INVALID_LOGON_HOURS; } /* Test account expire time */ kickoff_time = pdb_get_kickoff_time(sampass); if (kickoff_time != 0 && time(NULL) > kickoff_time) { DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass))); DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time)); return NT_STATUS_ACCOUNT_EXPIRED; } if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) { time_t must_change_time = pdb_get_pass_must_change_time(sampass); time_t last_set_time = pdb_get_pass_last_set_time(sampass); /* check for immediate expiry "must change at next logon" */ if (last_set_time == 0) { DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass))); return NT_STATUS_PASSWORD_MUST_CHANGE; } /* check for expired password */ if (must_change_time < time(NULL) && must_change_time != 0) { DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass))); DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time)); return NT_STATUS_PASSWORD_EXPIRED; } } /* Test workstation. Workstation list is comma separated. */ workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass)); if (!workstation_list) return NT_STATUS_NO_MEMORY; if (*workstation_list) { bool invalid_ws = True; char *tok; const char *s = workstation_list; const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name); if (machine_name == NULL) return NT_STATUS_NO_MEMORY; while (next_token_talloc(mem_ctx, &s, &tok, ",")) { DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n", tok, user_info->wksta_name)); if(strequal(tok, user_info->wksta_name)) { invalid_ws = False; break; } if (tok[0] == '+') { DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n", machine_name, tok + 1)); if (user_in_group(machine_name, tok + 1)) { invalid_ws = False; break; } } TALLOC_FREE(tok); } TALLOC_FREE(tok); if (invalid_ws) return NT_STATUS_INVALID_WORKSTATION; } if (acct_ctrl & ACB_DOMTRUST) { DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass))); return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT; } if (acct_ctrl & ACB_SVRTRUST) { if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) { DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass))); return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT; } } if (acct_ctrl & ACB_WSTRUST) { if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) { DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass))); return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT; } } return NT_STATUS_OK; } /**************************************************************************** check if a username/password is OK assuming the password is a 24 byte SMB hash supplied in the user_info structure return an NT_STATUS constant. ****************************************************************************/ static NTSTATUS check_sam_security(const struct auth_context *auth_context, void *my_private_data, TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info) { struct samu *sampass=NULL; bool ret; NTSTATUS nt_status; NTSTATUS update_login_attempts_status; DATA_BLOB user_sess_key = data_blob_null; DATA_BLOB lm_sess_key = data_blob_null; bool updated_autolock = False, updated_badpw = False; if (!user_info || !auth_context) { return NT_STATUS_UNSUCCESSFUL; } /* the returned struct gets kept on the server_info, by means of a steal further down */ if ( !(sampass = samu_new( mem_ctx )) ) { return NT_STATUS_NO_MEMORY; } /* get the account information */ become_root(); ret = pdb_getsampwnam(sampass, user_info->internal_username); unbecome_root(); if (ret == False) { DEBUG(3,("check_sam_security: Couldn't find user '%s' in " "passdb.\n", user_info->internal_username)); TALLOC_FREE(sampass); return NT_STATUS_NO_SUCH_USER; } /* see if autolock flag needs to be updated */ if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL) pdb_update_autolock_flag(sampass, &updated_autolock); /* Quit if the account was locked out. */ if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) { DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass))); return NT_STATUS_ACCOUNT_LOCKED_OUT; } nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, &user_sess_key, &lm_sess_key); /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */ update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status)); if (!NT_STATUS_IS_OK(nt_status)) { if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && pdb_get_acct_ctrl(sampass) &ACB_NORMAL && NT_STATUS_IS_OK(update_login_attempts_status)) { pdb_increment_bad_password_count(sampass); updated_badpw = True; } else { pdb_update_bad_password_count(sampass, &updated_badpw); } if (updated_autolock || updated_badpw){ become_root(); if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass))) DEBUG(1, ("Failed to modify entry.\n")); unbecome_root(); } data_blob_free(&user_sess_key); data_blob_free(&lm_sess_key); TALLOC_FREE(sampass); return nt_status; } if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && (pdb_get_bad_password_count(sampass) > 0)){ pdb_set_bad_password_count(sampass, 0, PDB_CHANGED); pdb_set_bad_password_time(sampass, 0, PDB_CHANGED); updated_badpw = True; } if (updated_autolock || updated_badpw){ become_root(); if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass))) DEBUG(1, ("Failed to modify entry.\n")); unbecome_root(); } nt_status = sam_account_ok(mem_ctx, sampass, user_info); if (!NT_STATUS_IS_OK(nt_status)) { TALLOC_FREE(sampass); data_blob_free(&user_sess_key); data_blob_free(&lm_sess_key); return nt_status; } become_root(); nt_status = make_server_info_sam(server_info, sampass); unbecome_root(); if (!NT_STATUS_IS_OK(nt_status)) { DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status))); data_blob_free(&user_sess_key); data_blob_free(&lm_sess_key); return nt_status; } (*server_info)->user_session_key = data_blob_talloc(*server_info, user_sess_key.data, user_sess_key.length); data_blob_free(&user_sess_key); (*server_info)->lm_session_key = data_blob_talloc(*server_info, lm_sess_key.data, lm_sess_key.length); data_blob_free(&lm_sess_key); (*server_info)->was_mapped |= user_info->was_mapped; return nt_status; } /* module initialisation */ static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) { if (!make_auth_methods(auth_context, auth_method)) { return NT_STATUS_NO_MEMORY; } (*auth_method)->auth = check_sam_security; (*auth_method)->name = "sam_ignoredomain"; return NT_STATUS_OK; } /**************************************************************************** Check SAM security (above) but with a few extra checks. ****************************************************************************/ static NTSTATUS check_samstrict_security(const struct auth_context *auth_context, void *my_private_data, TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info) { bool is_local_name, is_my_domain; if (!user_info || !auth_context) { return NT_STATUS_LOGON_FAILURE; } is_local_name = is_myname(user_info->domain); is_my_domain = strequal(user_info->domain, lp_workgroup()); /* check whether or not we service this domain/workgroup name */ switch ( lp_server_role() ) { case ROLE_STANDALONE: case ROLE_DOMAIN_MEMBER: if ( !is_local_name ) { DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n", user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") )); return NT_STATUS_NOT_IMPLEMENTED; } case ROLE_DOMAIN_PDC: case ROLE_DOMAIN_BDC: if ( !is_local_name && !is_my_domain ) { DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n", user_info->domain)); return NT_STATUS_NOT_IMPLEMENTED; } default: /* name is ok */ break; } return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info); } /* module initialisation */ static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) { if (!make_auth_methods(auth_context, auth_method)) { return NT_STATUS_NO_MEMORY; } (*auth_method)->auth = check_samstrict_security; (*auth_method)->name = "sam"; return NT_STATUS_OK; } NTSTATUS auth_sam_init(void) { smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam); smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain); return NT_STATUS_OK; }