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/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "passdb.h"
#include "auth-cache.h"
#if defined(BUILTIN_LUA) || defined(PLUGIN_BUILD)
#include "db-lua.h"
struct dlua_passdb_module {
struct passdb_module module;
struct dlua_script *script;
const char *file;
bool has_password_verify;
};
static enum passdb_result
passdb_lua_verify_password(struct dlua_passdb_module *module,
struct auth_request *request, const char *password)
{
const char *error = NULL;
enum passdb_result result =
auth_lua_call_password_verify(module->script, request,
password, &error);
if (result == PASSDB_RESULT_PASSWORD_MISMATCH) {
auth_request_log_password_mismatch(request, AUTH_SUBSYS_DB);
} else if (result == PASSDB_RESULT_INTERNAL_FAILURE && error != NULL) {
e_error(authdb_event(request), "passdb-lua: %s",
error);
}
return result;
}
static enum passdb_result
passdb_lua_lookup(struct auth_request *request,
const char **scheme_r, const char **password_r)
{
const char *error = NULL;
enum passdb_result result;
struct dlua_passdb_module *module =
(struct dlua_passdb_module *)request->passdb->passdb;
*scheme_r = *password_r = NULL;
result = auth_lua_call_passdb_lookup(module->script, request, scheme_r,
password_r, &error);
if (result == PASSDB_RESULT_INTERNAL_FAILURE && error != NULL) {
e_error(authdb_event(request), "db-lua: %s", error);
} else if (result != PASSDB_RESULT_OK) {
/* skip next bit */
} else if (!auth_fields_exists(request->fields.extra_fields, "nopassword")) {
if (*password_r == NULL || **password_r == '\0') {
result = auth_request_password_missing(request);
} else {
if (*scheme_r == NULL)
*scheme_r = request->passdb->passdb->default_pass_scheme;
auth_request_set_field(request, "password",
*password_r, *scheme_r);
}
} else if (*password_r != NULL && **password_r != '\0') {
e_info(authdb_event(request),
"nopassword given and password is not empty");
result = PASSDB_RESULT_PASSWORD_MISMATCH;
}
return result;
}
static void
passdb_lua_lookup_credentials(struct auth_request *request,
lookup_credentials_callback_t *callback)
{
const char *lua_password, *lua_scheme;
enum passdb_result result =
passdb_lua_lookup(request, &lua_scheme, &lua_password);
passdb_handle_credentials(result, lua_password, lua_scheme, callback, request);
}
static void
passdb_lua_verify_plain(struct auth_request *request, const char *password,
verify_plain_callback_t *callback)
{
struct dlua_passdb_module *module =
(struct dlua_passdb_module *)request->passdb->passdb;
const char *lua_password, *lua_scheme;
enum passdb_result result;
if (module->has_password_verify) {
result = passdb_lua_verify_password(module, request, password);
} else {
result = passdb_lua_lookup(request, &lua_scheme, &lua_password);
if (result == PASSDB_RESULT_OK) {
if (lua_scheme == NULL)
lua_scheme = "PLAIN";
result = auth_request_password_verify(request, password,
lua_password,
lua_scheme,
AUTH_SUBSYS_DB);
}
}
callback(result, request);
}
static struct passdb_module *
passdb_lua_preinit(pool_t pool, const char *args)
{
const char *cache_key = "%u";
const char *scheme = "PLAIN";
struct dlua_passdb_module *module;
bool blocking = TRUE;
module = p_new(pool, struct dlua_passdb_module, 1);
const char *const *fields = t_strsplit_spaces(args, " ");
while(*fields != NULL) {
if (str_begins(*fields, "file=")) {
module->file = p_strdup(pool, (*fields)+5);
} else if (str_begins(*fields, "blocking=")) {
const char *value = (*fields)+9;
if (strcmp(value, "yes") == 0) {
blocking = TRUE;
} else if (strcmp(value, "no") == 0) {
blocking = FALSE;
} else {
i_fatal("Invalid value %s. "
"Field blocking must be yes or no",
value);
}
} else if (str_begins(*fields, "cache_key=")) {
if (*((*fields)+10) != '\0')
cache_key = (*fields)+10;
else /* explicitly disable auth caching for lua */
cache_key = NULL;
} else if (str_begins(*fields, "scheme=")) {
scheme = p_strdup(pool, (*fields)+7);
} else {
i_fatal("Unsupported parameter %s", *fields);
}
fields++;
}
if (module->file == NULL)
i_fatal("passdb-lua: Missing mandatory file= parameter");
module->module.blocking = blocking;
module->module.default_cache_key =
auth_cache_parse_key(pool, cache_key);
module->module.default_pass_scheme = scheme;
return &module->module;
}
static void passdb_lua_init(struct passdb_module *_module)
{
struct dlua_passdb_module *module =
(struct dlua_passdb_module *)_module;
const char *error;
if (dlua_script_create_file(module->file, &module->script, auth_event, &error) < 0 ||
auth_lua_script_init(module->script, &error) < 0)
i_fatal("passdb-lua: initialization failed: %s", error);
module->has_password_verify =
dlua_script_has_function(module->script, AUTH_LUA_PASSWORD_VERIFY);
}
static void passdb_lua_deinit(struct passdb_module *_module)
{
struct dlua_passdb_module *module =
(struct dlua_passdb_module *)_module;
dlua_script_unref(&module->script);
}
#ifndef PLUGIN_BUILD
struct passdb_module_interface passdb_lua =
#else
struct passdb_module_interface passdb_lua_plugin =
#endif
{
"lua",
passdb_lua_preinit,
passdb_lua_init,
passdb_lua_deinit,
passdb_lua_verify_plain,
passdb_lua_lookup_credentials,
NULL
};
#else
struct passdb_module_interface passdb_lua = {
.name = "lua"
};
#endif
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