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- /*
- * Copyright 2023 Vsevolod Stakhov
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include "config.h"
- #include "rspamd.h"
- #include "libserver/maps/map.h"
- #include "scan_result.h"
- #include "dynamic_cfg.h"
- #include "unix-std.h"
- #include "lua/lua_common.h"
-
- #include <math.h>
-
- struct config_json_buf {
- GString *buf;
- struct rspamd_config *cfg;
- };
-
- /**
- * Apply configuration to the specified configuration
- * @param conf_metrics
- * @param cfg
- */
- static void
- apply_dynamic_conf(const ucl_object_t *top, struct rspamd_config *cfg)
- {
- enum rspamd_action_type test_act;
- const ucl_object_t *cur_elt, *cur_nm, *it_val;
- ucl_object_iter_t it = NULL;
- const char *name;
- double nscore;
- static const unsigned int priority = 3;
-
- while ((cur_elt = ucl_object_iterate(top, &it, true))) {
- if (ucl_object_type(cur_elt) != UCL_OBJECT) {
- msg_err("loaded json array element is not an object");
- continue;
- }
-
- cur_nm = ucl_object_lookup(cur_elt, "metric");
- if (!cur_nm || ucl_object_type(cur_nm) != UCL_STRING) {
- msg_err(
- "loaded json metric object element has no 'metric' attribute");
- continue;
- }
-
- cur_nm = ucl_object_lookup(cur_elt, "symbols");
- /* Parse symbols */
- if (cur_nm && ucl_object_type(cur_nm) == UCL_ARRAY) {
- ucl_object_iter_t nit = NULL;
-
- while ((it_val = ucl_object_iterate(cur_nm, &nit, true))) {
- if (ucl_object_lookup(it_val, "name") &&
- ucl_object_lookup(it_val, "value")) {
- const ucl_object_t *n =
- ucl_object_lookup(it_val, "name");
- const ucl_object_t *v =
- ucl_object_lookup(it_val, "value");
-
- nscore = ucl_object_todouble(v);
-
- /*
- * We use priority = 3 here
- */
- rspamd_config_add_symbol(cfg,
- ucl_object_tostring(n), nscore, NULL, NULL,
- 0, priority, cfg->default_max_shots);
- }
- else {
- msg_info(
- "json symbol object has no mandatory 'name' and 'value' attributes");
- }
- }
- }
- else {
- ucl_object_t *arr;
-
- arr = ucl_object_typed_new(UCL_ARRAY);
- ucl_object_insert_key((ucl_object_t *) cur_elt, arr, "symbols",
- sizeof("symbols") - 1, false);
- }
- cur_nm = ucl_object_lookup(cur_elt, "actions");
- /* Parse actions */
- if (cur_nm && ucl_object_type(cur_nm) == UCL_ARRAY) {
- ucl_object_iter_t nit = NULL;
-
- while ((it_val = ucl_object_iterate(cur_nm, &nit, true))) {
- const ucl_object_t *n = ucl_object_lookup(it_val, "name");
- const ucl_object_t *v = ucl_object_lookup(it_val, "value");
-
- if (n != NULL && v != NULL) {
- name = ucl_object_tostring(n);
-
- if (!name || !rspamd_action_from_str(name, &test_act)) {
- msg_err("unknown action: %s",
- ucl_object_tostring(ucl_object_lookup(it_val,
- "name")));
- continue;
- }
-
-
- if (ucl_object_type(v) == UCL_NULL) {
- nscore = NAN;
- }
- else {
- nscore = ucl_object_todouble(v);
- }
-
- ucl_object_t *obj_tbl = ucl_object_typed_new(UCL_OBJECT);
- ucl_object_insert_key(obj_tbl, ucl_object_fromdouble(nscore),
- "score", 0, false);
- ucl_object_insert_key(obj_tbl, ucl_object_fromdouble(priority),
- "priority", 0, false);
- rspamd_config_set_action_score(cfg, name, obj_tbl);
- ucl_object_unref(obj_tbl);
- }
- else {
- msg_info(
- "json action object has no mandatory 'name' and 'value' attributes");
- }
- }
- }
- else {
- ucl_object_t *arr;
-
- arr = ucl_object_typed_new(UCL_ARRAY);
- ucl_object_insert_key((ucl_object_t *) cur_elt, arr, "actions",
- sizeof("actions") - 1, false);
- }
- }
- }
-
- /* Callbacks for reading json dynamic rules */
- static char *
- json_config_read_cb(char *chunk,
- int len,
- struct map_cb_data *data,
- gboolean final)
- {
- struct config_json_buf *jb, *pd;
-
- pd = data->prev_data;
-
- g_assert(pd != NULL);
-
- if (data->cur_data == NULL) {
- jb = g_malloc0(sizeof(*jb));
- jb->cfg = pd->cfg;
- data->cur_data = jb;
- }
- else {
- jb = data->cur_data;
- }
-
- if (jb->buf == NULL) {
- /* Allocate memory for buffer */
- jb->buf = g_string_sized_new(MAX(len, BUFSIZ));
- }
-
- g_string_append_len(jb->buf, chunk, len);
-
- return NULL;
- }
-
- static void
- json_config_fin_cb(struct map_cb_data *data, void **target)
- {
- struct config_json_buf *jb;
- ucl_object_t *top;
- struct ucl_parser *parser;
-
- /* Now parse json */
- if (data->cur_data) {
- jb = data->cur_data;
- }
- else {
- return;
- }
-
- if (jb->buf == NULL) {
- msg_err("no data read");
-
- return;
- }
-
- parser = ucl_parser_new(0);
-
- if (!ucl_parser_add_chunk(parser, jb->buf->str, jb->buf->len)) {
- msg_err("cannot load json data: parse error %s",
- ucl_parser_get_error(parser));
- ucl_parser_free(parser);
- return;
- }
-
- top = ucl_parser_get_object(parser);
- ucl_parser_free(parser);
-
- if (ucl_object_type(top) != UCL_ARRAY) {
- ucl_object_unref(top);
- msg_err("loaded json is not an array");
- return;
- }
-
- ucl_object_unref(jb->cfg->current_dynamic_conf);
- apply_dynamic_conf(top, jb->cfg);
- jb->cfg->current_dynamic_conf = top;
-
- if (target) {
- *target = data->cur_data;
- }
-
- if (data->prev_data) {
- jb = data->prev_data;
- /* Clean prev data */
- if (jb->buf) {
- g_string_free(jb->buf, TRUE);
- }
-
- g_free(jb);
- }
- }
-
- static void
- json_config_dtor_cb(struct map_cb_data *data)
- {
- struct config_json_buf *jb;
-
- if (data->cur_data) {
- jb = data->cur_data;
- /* Clean prev data */
- if (jb->buf) {
- g_string_free(jb->buf, TRUE);
- }
-
- if (jb->cfg && jb->cfg->current_dynamic_conf) {
- ucl_object_unref(jb->cfg->current_dynamic_conf);
- }
-
- g_free(jb);
- }
- }
-
- /**
- * Init dynamic configuration using map logic and specific configuration
- * @param cfg config file
- */
- void init_dynamic_config(struct rspamd_config *cfg)
- {
- struct config_json_buf *jb, **pjb;
-
- if (cfg->dynamic_conf == NULL) {
- /* No dynamic conf has been specified, so do not try to load it */
- return;
- }
-
- /* Now try to add map with json data */
- jb = g_malloc(sizeof(struct config_json_buf));
- pjb = g_malloc(sizeof(struct config_json_buf *));
- jb->buf = NULL;
- jb->cfg = cfg;
- *pjb = jb;
- cfg->current_dynamic_conf = ucl_object_typed_new(UCL_ARRAY);
- rspamd_mempool_add_destructor(cfg->cfg_pool,
- (rspamd_mempool_destruct_t) g_free,
- pjb);
-
- if (!rspamd_map_add(cfg,
- cfg->dynamic_conf,
- "Dynamic configuration map",
- json_config_read_cb,
- json_config_fin_cb,
- json_config_dtor_cb,
- (void **) pjb, NULL, RSPAMD_MAP_DEFAULT)) {
- msg_err("cannot add map for configuration %s", cfg->dynamic_conf);
- }
- }
-
- /**
- * Dump dynamic configuration to the disk
- * @param cfg
- * @return
- */
- gboolean
- dump_dynamic_config(struct rspamd_config *cfg)
- {
- struct stat st;
- char *dir, pathbuf[PATH_MAX];
- int fd;
-
- if (cfg->dynamic_conf == NULL || cfg->current_dynamic_conf == NULL) {
- /* No dynamic conf has been specified, so do not try to dump it */
- msg_err("cannot save dynamic conf as it is not specified");
- return FALSE;
- }
-
- dir = g_path_get_dirname(cfg->dynamic_conf);
- if (dir == NULL) {
- msg_err("invalid path: %s", cfg->dynamic_conf);
- return FALSE;
- }
-
- if (stat(cfg->dynamic_conf, &st) == -1) {
- msg_debug("%s is unavailable: %s", cfg->dynamic_conf,
- strerror(errno));
- st.st_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
- }
- if (access(dir, W_OK | R_OK) == -1) {
- msg_warn("%s is inaccessible: %s", dir, strerror(errno));
- g_free(dir);
- return FALSE;
- }
- rspamd_snprintf(pathbuf,
- sizeof(pathbuf),
- "%s%crconf-XXXXXX",
- dir,
- G_DIR_SEPARATOR);
- g_free(dir);
- #ifdef HAVE_MKSTEMP
- /* Umask is set before */
- fd = mkstemp(pathbuf);
- #else
- fd = g_mkstemp_full(pathbuf, O_RDWR, S_IWUSR | S_IRUSR);
- #endif
- if (fd == -1) {
- msg_err("mkstemp error: %s", strerror(errno));
-
- return FALSE;
- }
-
- struct ucl_emitter_functions *emitter_functions;
- FILE *fp;
-
- fp = fdopen(fd, "w");
- emitter_functions = ucl_object_emit_file_funcs(fp);
-
- if (!ucl_object_emit_full(cfg->current_dynamic_conf, UCL_EMIT_JSON,
- emitter_functions, NULL)) {
- msg_err("cannot emit ucl object: %s", strerror(errno));
- ucl_object_emit_funcs_free(emitter_functions);
- fclose(fp);
- return FALSE;
- }
-
- (void) unlink(cfg->dynamic_conf);
-
- /* Rename old config */
- if (rename(pathbuf, cfg->dynamic_conf) == -1) {
- msg_err("rename error: %s", strerror(errno));
- fclose(fp);
- ucl_object_emit_funcs_free(emitter_functions);
- unlink(pathbuf);
-
- return FALSE;
- }
- /* Set permissions */
-
- if (chmod(cfg->dynamic_conf, st.st_mode) == -1) {
- msg_warn("chmod failed: %s", strerror(errno));
- }
-
- fclose(fp);
- ucl_object_emit_funcs_free(emitter_functions);
-
- return TRUE;
- }
-
- static ucl_object_t *
- new_dynamic_metric(const char *metric_name, ucl_object_t *top)
- {
- ucl_object_t *metric;
-
- metric = ucl_object_typed_new(UCL_OBJECT);
-
- ucl_object_insert_key(metric, ucl_object_fromstring(metric_name),
- "metric", sizeof("metric") - 1, true);
- ucl_object_insert_key(metric, ucl_object_typed_new(UCL_ARRAY),
- "actions", sizeof("actions") - 1, false);
- ucl_object_insert_key(metric, ucl_object_typed_new(UCL_ARRAY),
- "symbols", sizeof("symbols") - 1, false);
-
- ucl_array_append(top, metric);
-
- return metric;
- }
-
- static ucl_object_t *
- dynamic_metric_find_elt(const ucl_object_t *arr, const char *name)
- {
- ucl_object_iter_t it = NULL;
- const ucl_object_t *cur, *n;
-
- it = ucl_object_iterate_new(arr);
-
- while ((cur = ucl_object_iterate_safe(it, true)) != NULL) {
- if (cur->type == UCL_OBJECT) {
- n = ucl_object_lookup(cur, "name");
- if (n && n->type == UCL_STRING &&
- strcmp(name, ucl_object_tostring(n)) == 0) {
- ucl_object_iterate_free(it);
-
- return (ucl_object_t *) ucl_object_lookup(cur, "value");
- }
- }
- }
-
- ucl_object_iterate_free(it);
-
- return NULL;
- }
-
- static ucl_object_t *
- dynamic_metric_find_metric(const ucl_object_t *arr, const char *metric)
- {
- ucl_object_iter_t it = NULL;
- const ucl_object_t *cur, *n;
-
- it = ucl_object_iterate_new(arr);
-
- while ((cur = ucl_object_iterate_safe(it, true)) != NULL) {
- if (cur->type == UCL_OBJECT) {
- n = ucl_object_lookup(cur, "metric");
- if (n && n->type == UCL_STRING &&
- strcmp(metric, ucl_object_tostring(n)) == 0) {
- ucl_object_iterate_free(it);
-
- return (ucl_object_t *) cur;
- }
- }
- }
-
- ucl_object_iterate_free(it);
-
- return NULL;
- }
-
- static ucl_object_t *
- new_dynamic_elt(ucl_object_t *arr, const char *name, double value)
- {
- ucl_object_t *n;
-
- n = ucl_object_typed_new(UCL_OBJECT);
- ucl_object_insert_key(n, ucl_object_fromstring(name), "name",
- sizeof("name") - 1, false);
- ucl_object_insert_key(n, ucl_object_fromdouble(value), "value",
- sizeof("value") - 1, false);
-
- ucl_array_append(arr, n);
-
- return n;
- }
-
- static int
- rspamd_maybe_add_lua_dynsym(struct rspamd_config *cfg,
- const char *sym,
- double score)
- {
- lua_State *L = cfg->lua_state;
- int ret = -1;
- struct rspamd_config **pcfg;
-
- lua_getglobal(L, "rspamd_plugins");
- if (lua_type(L, -1) == LUA_TTABLE) {
- lua_pushstring(L, "dynamic_conf");
- lua_gettable(L, -2);
-
- if (lua_type(L, -1) == LUA_TTABLE) {
- lua_pushstring(L, "add_symbol");
- lua_gettable(L, -2);
-
- if (lua_type(L, -1) == LUA_TFUNCTION) {
- pcfg = lua_newuserdata(L, sizeof(*pcfg));
- *pcfg = cfg;
- rspamd_lua_setclass(L, rspamd_config_classname, -1);
- lua_pushstring(L, sym);
- lua_pushnumber(L, score);
-
- if (lua_pcall(L, 3, 1, 0) != 0) {
- msg_err_config("cannot execute add_symbol script: %s",
- lua_tostring(L, -1));
- }
- else {
- ret = lua_toboolean(L, -1);
- }
-
- lua_pop(L, 1);
- }
- else {
- lua_pop(L, 1);
- }
- }
-
- lua_pop(L, 1);
- }
-
- lua_pop(L, 1);
-
- return ret;
- }
-
- static int
- rspamd_maybe_add_lua_dynact(struct rspamd_config *cfg,
- const char *action,
- double score)
- {
- lua_State *L = cfg->lua_state;
- int ret = -1;
- struct rspamd_config **pcfg;
-
- lua_getglobal(L, "rspamd_plugins");
- if (lua_type(L, -1) == LUA_TTABLE) {
- lua_pushstring(L, "dynamic_conf");
- lua_gettable(L, -2);
-
- if (lua_type(L, -1) == LUA_TTABLE) {
- lua_pushstring(L, "add_action");
- lua_gettable(L, -2);
-
- if (lua_type(L, -1) == LUA_TFUNCTION) {
- pcfg = lua_newuserdata(L, sizeof(*pcfg));
- *pcfg = cfg;
- rspamd_lua_setclass(L, rspamd_config_classname, -1);
- lua_pushstring(L, action);
- lua_pushnumber(L, score);
-
- if (lua_pcall(L, 3, 1, 0) != 0) {
- msg_err_config("cannot execute add_action script: %s",
- lua_tostring(L, -1));
- }
- else {
- ret = lua_toboolean(L, -1);
- }
-
- lua_pop(L, 1);
- }
- else {
- lua_pop(L, 1);
- }
- }
-
- lua_pop(L, 1);
- }
-
- lua_pop(L, 1);
-
- return ret;
- }
-
- /**
- * Add symbol for specified metric
- * @param cfg config file object
- * @param metric metric's name
- * @param symbol symbol's name
- * @param value value of symbol
- * @return
- */
- gboolean
- add_dynamic_symbol(struct rspamd_config *cfg,
- const char *metric_name,
- const char *symbol,
- double value)
- {
- ucl_object_t *metric, *syms;
- int ret;
-
- if ((ret = rspamd_maybe_add_lua_dynsym(cfg, symbol, value)) != -1) {
- return ret == 0 ? FALSE : TRUE;
- }
-
- if (cfg->dynamic_conf == NULL) {
- msg_info("dynamic conf is disabled");
- return FALSE;
- }
-
- metric = dynamic_metric_find_metric(cfg->current_dynamic_conf,
- metric_name);
- if (metric == NULL) {
- metric = new_dynamic_metric(metric_name, cfg->current_dynamic_conf);
- }
-
- syms = (ucl_object_t *) ucl_object_lookup(metric, "symbols");
- if (syms != NULL) {
- ucl_object_t *sym;
-
- sym = dynamic_metric_find_elt(syms, symbol);
- if (sym) {
- sym->value.dv = value;
- }
- else {
- new_dynamic_elt(syms, symbol, value);
- }
- }
-
- apply_dynamic_conf(cfg->current_dynamic_conf, cfg);
-
- return TRUE;
- }
-
- gboolean
- remove_dynamic_symbol(struct rspamd_config *cfg,
- const char *metric_name,
- const char *symbol)
- {
- ucl_object_t *metric, *syms;
- gboolean ret = FALSE;
-
- if (cfg->dynamic_conf == NULL) {
- msg_info("dynamic conf is disabled");
- return FALSE;
- }
-
- metric = dynamic_metric_find_metric(cfg->current_dynamic_conf,
- metric_name);
- if (metric == NULL) {
- return FALSE;
- }
-
- syms = (ucl_object_t *) ucl_object_lookup(metric, "symbols");
- if (syms != NULL) {
- ucl_object_t *sym;
-
- sym = dynamic_metric_find_elt(syms, symbol);
-
- if (sym) {
- ret = ucl_array_delete((ucl_object_t *) syms, sym) != NULL;
-
- if (ret) {
- ucl_object_unref(sym);
- }
- }
- }
-
- if (ret) {
- apply_dynamic_conf(cfg->current_dynamic_conf, cfg);
- }
-
- return ret;
- }
-
-
- /**
- * Add action for specified metric
- * @param cfg config file object
- * @param metric metric's name
- * @param action action's name
- * @param value value of symbol
- * @return
- */
- gboolean
- add_dynamic_action(struct rspamd_config *cfg,
- const char *metric_name,
- unsigned int action,
- double value)
- {
- ucl_object_t *metric, *acts;
- const char *action_name = rspamd_action_to_str(action);
- int ret;
-
- if ((ret = rspamd_maybe_add_lua_dynact(cfg, action_name, value)) != -1) {
- return ret == 0 ? FALSE : TRUE;
- }
-
- if (cfg->dynamic_conf == NULL) {
- msg_info("dynamic conf is disabled");
- return FALSE;
- }
-
- metric = dynamic_metric_find_metric(cfg->current_dynamic_conf,
- metric_name);
- if (metric == NULL) {
- metric = new_dynamic_metric(metric_name, cfg->current_dynamic_conf);
- }
-
- acts = (ucl_object_t *) ucl_object_lookup(metric, "actions");
- if (acts != NULL) {
- ucl_object_t *act;
-
- act = dynamic_metric_find_elt(acts, action_name);
- if (act) {
- act->value.dv = value;
- }
- else {
- new_dynamic_elt(acts, action_name, value);
- }
- }
-
- apply_dynamic_conf(cfg->current_dynamic_conf, cfg);
-
- return TRUE;
- }
-
- gboolean
- remove_dynamic_action(struct rspamd_config *cfg,
- const char *metric_name,
- unsigned int action)
- {
- ucl_object_t *metric, *acts;
- const char *action_name = rspamd_action_to_str(action);
- gboolean ret = FALSE;
-
- if (cfg->dynamic_conf == NULL) {
- msg_info("dynamic conf is disabled");
- return FALSE;
- }
-
- metric = dynamic_metric_find_metric(cfg->current_dynamic_conf,
- metric_name);
- if (metric == NULL) {
- return FALSE;
- }
-
- acts = (ucl_object_t *) ucl_object_lookup(metric, "actions");
-
- if (acts != NULL) {
- ucl_object_t *act;
-
- act = dynamic_metric_find_elt(acts, action_name);
-
- if (act) {
- ret = ucl_array_delete(acts, act) != NULL;
- }
- if (ret) {
- ucl_object_unref(act);
- }
- }
-
- if (ret) {
- apply_dynamic_conf(cfg->current_dynamic_conf, cfg);
- }
-
- return ret;
- }
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