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- /*-
- * Copyright 2016 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.
- */
- /***MODULE:fuzzy
- * rspamd module that checks fuzzy checksums for messages
- *
- * Allowed options:
- * - symbol (string): symbol to insert (default: 'R_FUZZY')
- * - max_score (double): maximum score to that weights of hashes would be normalized (default: 0 - no normalization)
- *
- * - fuzzy_map (string): a string that contains map in format { fuzzy_key => [ symbol, weight ] } where fuzzy_key is number of
- * fuzzy list. This string itself should be in format 1:R_FUZZY_SAMPLE1:10,2:R_FUZZY_SAMPLE2:1 etc, where first number is fuzzy
- * key, second is symbol to insert and third - weight for normalization
- *
- * - min_length (integer): minimum length (in characters) for text part to be checked for fuzzy hash (default: 0 - no limit)
- * - whitelist (map string): map of ip addresses that should not be checked with this module
- * - servers (string): list of fuzzy servers in format "server1:port,server2:port" - these servers would be used for checking and storing
- * fuzzy hashes
- */
-
- #include "config.h"
- #include "libmime/message.h"
- #include "libutil/map.h"
- #include "libmime/images.h"
- #include "libserver/worker_util.h"
- #include "fuzzy_wire.h"
- #include "utlist.h"
- #include "cryptobox.h"
- #include "ottery.h"
- #include "keypair.h"
- #include "lua/lua_common.h"
- #include "unix-std.h"
- #include "libutil/http_private.h"
- #include <math.h>
-
- #define DEFAULT_SYMBOL "R_FUZZY_HASH"
- #define DEFAULT_UPSTREAM_ERROR_TIME 10
- #define DEFAULT_UPSTREAM_DEAD_TIME 300
- #define DEFAULT_UPSTREAM_MAXERRORS 10
-
- #define DEFAULT_IO_TIMEOUT 500
- #define DEFAULT_RETRANSMITS 3
- #define DEFAULT_PORT 11335
-
- #define RSPAMD_FUZZY_PLUGIN_VERSION RSPAMD_FUZZY_VERSION
-
- static const gint rspamd_fuzzy_hash_len = 5;
-
- struct fuzzy_mapping {
- guint64 fuzzy_flag;
- const gchar *symbol;
- double weight;
- };
-
- struct fuzzy_mime_type {
- rspamd_regexp_t *type_re;
- rspamd_regexp_t *subtype_re;
- };
-
- struct fuzzy_rule {
- struct upstream_list *servers;
- const gchar *symbol;
- const gchar *algorithm_str;
- const gchar *name;
- enum rspamd_shingle_alg alg;
- GHashTable *mappings;
- GPtrArray *mime_types;
- GPtrArray *fuzzy_headers;
- GString *hash_key;
- GString *shingles_key;
- struct rspamd_cryptobox_keypair *local_key;
- struct rspamd_cryptobox_pubkey *peer_key;
- double max_score;
- gboolean read_only;
- gboolean skip_unknown;
- gint learn_condition_cb;
- };
-
- struct fuzzy_ctx {
- struct module_ctx ctx;
- rspamd_mempool_t *fuzzy_pool;
- GPtrArray *fuzzy_rules;
- struct rspamd_config *cfg;
- const gchar *default_symbol;
- guint32 min_hash_len;
- radix_compressed_t *whitelist;
- struct rspamd_keypair_cache *keypairs_cache;
- guint32 min_bytes;
- guint32 min_height;
- guint32 min_width;
- guint32 io_timeout;
- guint32 retransmits;
- gboolean enabled;
- };
-
- struct fuzzy_client_session {
- GPtrArray *commands;
- struct rspamd_task *task;
- struct upstream *server;
- rspamd_inet_addr_t *addr;
- struct fuzzy_rule *rule;
- struct event ev;
- struct event timev;
- struct timeval tv;
- gint state;
- gint fd;
- guint retransmits;
- };
-
- struct fuzzy_learn_session {
- GPtrArray *commands;
- gint *saved;
- GError **err;
- struct rspamd_http_connection_entry *http_entry;
- struct rspamd_async_session *session;
- struct upstream *server;
- rspamd_inet_addr_t *addr;
- struct fuzzy_rule *rule;
- struct rspamd_task *task;
- struct event ev;
- struct event timev;
- struct timeval tv;
- gint fd;
- guint retransmits;
- };
-
- #define FUZZY_CMD_FLAG_REPLIED (1 << 0)
- #define FUZZY_CMD_FLAG_SENT (1 << 1)
- #define FUZZY_CMD_FLAG_IMAGE (1 << 2)
-
- struct fuzzy_cmd_io {
- guint32 tag;
- guint32 flags;
- struct rspamd_fuzzy_cmd cmd;
- struct iovec io;
- };
-
- static struct fuzzy_ctx *fuzzy_module_ctx = NULL;
- static const char *default_headers = "Subject,Content-Type,Reply-To,X-Mailer";
-
- static void fuzzy_symbol_callback (struct rspamd_task *task, void *unused);
-
- /* Initialization */
- gint fuzzy_check_module_init (struct rspamd_config *cfg,
- struct module_ctx **ctx);
- gint fuzzy_check_module_config (struct rspamd_config *cfg);
- gint fuzzy_check_module_reconfig (struct rspamd_config *cfg);
- static gint fuzzy_attach_controller (struct module_ctx *ctx,
- GHashTable *commands);
- static gint fuzzy_lua_learn_handler (lua_State *L);
- static gint fuzzy_lua_unlearn_handler (lua_State *L);
-
- module_t fuzzy_check_module = {
- "fuzzy_check",
- fuzzy_check_module_init,
- fuzzy_check_module_config,
- fuzzy_check_module_reconfig,
- fuzzy_attach_controller,
- RSPAMD_MODULE_VER
- };
-
- static void
- parse_flags (struct fuzzy_rule *rule,
- struct rspamd_config *cfg,
- const ucl_object_t *val,
- gint cb_id)
- {
- const ucl_object_t *elt;
- struct fuzzy_mapping *map;
- const gchar *sym = NULL;
-
- if (val->type == UCL_STRING) {
- msg_err_config (
- "string mappings are deprecated and no longer supported, use new style configuration");
- }
- else if (val->type == UCL_OBJECT) {
- elt = ucl_object_lookup (val, "symbol");
- if (elt == NULL || !ucl_object_tostring_safe (elt, &sym)) {
- sym = ucl_object_key (val);
- }
- if (sym != NULL) {
- map =
- rspamd_mempool_alloc (fuzzy_module_ctx->fuzzy_pool,
- sizeof (struct fuzzy_mapping));
- map->symbol = sym;
- elt = ucl_object_lookup (val, "flag");
-
- if (elt != NULL) {
- map->fuzzy_flag = ucl_obj_toint (elt);
-
- elt = ucl_object_lookup (val, "max_score");
-
- if (elt != NULL) {
- map->weight = ucl_obj_todouble (elt);
- }
- else {
- map->weight = rule->max_score;
- }
- /* Add flag to hash table */
- g_hash_table_insert (rule->mappings,
- GINT_TO_POINTER (map->fuzzy_flag), map);
- rspamd_symbols_cache_add_symbol (cfg->cache,
- map->symbol, 0,
- NULL, NULL,
- SYMBOL_TYPE_VIRTUAL|SYMBOL_TYPE_FINE,
- cb_id);
- }
- else {
- msg_err_config ("fuzzy_map parameter has no flag definition");
- }
- }
- else {
- msg_err_config ("fuzzy_map parameter has no symbol definition");
- }
- }
- else {
- msg_err_config ("fuzzy_map parameter is of an unsupported type");
- }
- }
-
-
- static GPtrArray *
- parse_mime_types (const gchar *str)
- {
- gchar **strvec, *p;
- gint num, i;
- struct fuzzy_mime_type *type;
- GPtrArray *res = g_ptr_array_new ();
-
- strvec = g_strsplit_set (str, ",", 0);
- num = g_strv_length (strvec);
- res = g_ptr_array_sized_new (num);
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- rspamd_ptr_array_free_hard, res);
-
- for (i = 0; i < num; i++) {
- g_strstrip (strvec[i]);
-
- if ((p = strchr (strvec[i], '/')) != NULL) {
- type = rspamd_mempool_alloc (fuzzy_module_ctx->fuzzy_pool,
- sizeof (struct fuzzy_mime_type));
- type->type_re = rspamd_regexp_from_glob (strvec[i], p - strvec[i],
- NULL);
- type->subtype_re = rspamd_regexp_from_glob (p + 1, 0, NULL);
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t)rspamd_regexp_unref,
- type->type_re);
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t)rspamd_regexp_unref,
- type->subtype_re);
- g_ptr_array_add (res, type);
- }
- else {
- type = rspamd_mempool_alloc (fuzzy_module_ctx->fuzzy_pool,
- sizeof (struct fuzzy_mime_type));
- type->type_re = rspamd_regexp_from_glob (strvec[i], 0, NULL);
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t)rspamd_regexp_unref,
- type->type_re);
- type->subtype_re = NULL;
- g_ptr_array_add (res, type);
- }
- }
-
- g_strfreev (strvec);
-
- return res;
- }
-
- static GPtrArray *
- parse_fuzzy_headers (const gchar *str)
- {
- gchar **strvec;
- gint num, i;
- GPtrArray *res;
-
- strvec = g_strsplit_set (str, ",", 0);
- num = g_strv_length (strvec);
- res = g_ptr_array_sized_new (num);
-
- for (i = 0; i < num; i++) {
- g_strstrip (strvec[i]);
- g_ptr_array_add (res, rspamd_mempool_strdup (
- fuzzy_module_ctx->fuzzy_pool, strvec[i]));
- }
-
- g_strfreev (strvec);
-
- return res;
- }
-
- static gboolean
- fuzzy_check_content_type (struct fuzzy_rule *rule, struct rspamd_content_type *ct)
- {
- struct fuzzy_mime_type *ft;
- guint i;
-
- PTR_ARRAY_FOREACH (rule->mime_types, i, ft) {
- if (ft->type_re) {
-
- if (rspamd_regexp_match (ft->type_re, ct->type.begin, ct->type.len,
- TRUE)) {
- if (ft->subtype_re) {
- if (rspamd_regexp_match (ft->subtype_re, ct->subtype.begin,
- ct->subtype.len, TRUE)) {
- return TRUE;
- }
- }
- else {
- return TRUE;
- }
- }
- }
- }
-
- return FALSE;
- }
-
- static double
- fuzzy_normalize (gint32 in, double weight)
- {
- if (weight == 0) {
- return 0;
- }
- #ifdef HAVE_TANH
- return tanh (G_E * (double)in / weight);
- #else
- return (in < weight ? in / weight : weight);
- #endif
- }
-
- static struct fuzzy_rule *
- fuzzy_rule_new (const char *default_symbol, rspamd_mempool_t *pool)
- {
- struct fuzzy_rule *rule;
-
- rule = rspamd_mempool_alloc0 (pool, sizeof (struct fuzzy_rule));
-
- rule->mappings = g_hash_table_new (g_direct_hash, g_direct_equal);
- rule->symbol = default_symbol;
- rspamd_mempool_add_destructor (pool,
- (rspamd_mempool_destruct_t)g_hash_table_unref,
- rule->mappings);
- rule->read_only = FALSE;
-
- return rule;
- }
-
- static void
- fuzzy_free_rule (gpointer r)
- {
- struct fuzzy_rule *rule = (struct fuzzy_rule *)r;
-
- g_string_free (rule->hash_key, TRUE);
- g_string_free (rule->shingles_key, TRUE);
-
- if (rule->local_key) {
- rspamd_keypair_unref (rule->local_key);
- }
-
- if (rule->peer_key) {
- rspamd_pubkey_unref (rule->peer_key);
- }
- }
-
- static gint
- fuzzy_parse_rule (struct rspamd_config *cfg, const ucl_object_t *obj,
- const gchar *name, gint cb_id)
- {
- const ucl_object_t *value, *cur;
- struct fuzzy_rule *rule;
- ucl_object_iter_t it = NULL;
- const char *k = NULL, *key_str = NULL, *shingles_key_str = NULL, *lua_script;
-
- if (obj->type != UCL_OBJECT) {
- msg_err_config ("invalid rule definition");
- return -1;
- }
-
- rule = fuzzy_rule_new (fuzzy_module_ctx->default_symbol,
- fuzzy_module_ctx->fuzzy_pool);
- rule->learn_condition_cb = -1;
- rule->alg = RSPAMD_SHINGLES_OLD;
-
- if ((value = ucl_object_lookup (obj, "mime_types")) != NULL) {
- it = NULL;
- while ((cur = ucl_object_iterate (value, &it, value->type == UCL_ARRAY))
- != NULL) {
- GPtrArray *tmp;
- guint i;
- gpointer ptr;
-
- tmp = parse_mime_types (ucl_obj_tostring (cur));
-
- if (tmp) {
- if (rule->mime_types) {
- PTR_ARRAY_FOREACH (tmp, i, ptr) {
- g_ptr_array_add (rule->mime_types, ptr);
- }
-
- g_ptr_array_free (tmp, TRUE);
- }
- else {
- rule->mime_types = tmp;
- }
- }
- }
- }
-
- if (rule->mime_types != NULL) {
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t)rspamd_ptr_array_free_hard,
- rule->mime_types);
- }
-
- if ((value = ucl_object_lookup (obj, "headers")) != NULL) {
- it = NULL;
- while ((cur = ucl_object_iterate (value, &it, value->type == UCL_ARRAY))
- != NULL) {
- GPtrArray *tmp;
- guint i;
- gpointer ptr;
-
- tmp = parse_fuzzy_headers (ucl_obj_tostring (cur));
-
- if (tmp) {
- if (rule->fuzzy_headers) {
- PTR_ARRAY_FOREACH (tmp, i, ptr) {
- g_ptr_array_add (rule->fuzzy_headers, ptr);
- }
-
- g_ptr_array_free (tmp, TRUE);
- }
- else {
- rule->fuzzy_headers = tmp;
- }
- }
- }
- }
- else {
- rule->fuzzy_headers = parse_fuzzy_headers (default_headers);
- }
-
- if (rule->fuzzy_headers != NULL) {
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t) rspamd_ptr_array_free_hard,
- rule->fuzzy_headers);
- }
-
-
- if ((value = ucl_object_lookup (obj, "max_score")) != NULL) {
- rule->max_score = ucl_obj_todouble (value);
- }
-
- if ((value = ucl_object_lookup (obj, "symbol")) != NULL) {
- rule->symbol = ucl_obj_tostring (value);
- }
-
- if (name) {
- rule->name = name;
- }
- else {
- rule->name = rule->symbol;
- }
-
-
- if ((value = ucl_object_lookup (obj, "read_only")) != NULL) {
- rule->read_only = ucl_obj_toboolean (value);
- }
-
- if ((value = ucl_object_lookup (obj, "skip_unknown")) != NULL) {
- rule->skip_unknown = ucl_obj_toboolean (value);
- }
-
- if ((value = ucl_object_lookup (obj, "algorithm")) != NULL) {
- rule->algorithm_str = ucl_object_tostring (value);
-
- if (rule->algorithm_str) {
- if (g_ascii_strcasecmp (rule->algorithm_str, "old") == 0 ||
- g_ascii_strcasecmp (rule->algorithm_str, "siphash") == 0) {
- rule->alg = RSPAMD_SHINGLES_OLD;
- }
- else if (g_ascii_strcasecmp (rule->algorithm_str, "xxhash") == 0) {
- rule->alg = RSPAMD_SHINGLES_XXHASH;
- }
- else if (g_ascii_strcasecmp (rule->algorithm_str, "mumhash") == 0) {
- rule->alg = RSPAMD_SHINGLES_MUMHASH;
- }
- else if (g_ascii_strcasecmp (rule->algorithm_str, "fasthash") == 0 ||
- g_ascii_strcasecmp (rule->algorithm_str, "fast") == 0) {
- rule->alg = RSPAMD_SHINGLES_FAST;
- }
- else {
- msg_warn_config ("unknown algorithm: %s, use siphash by default",
- rule->algorithm_str);
- }
- }
- }
-
- /* Set a consistent and short string name */
- switch (rule->alg) {
- case RSPAMD_SHINGLES_OLD:
- rule->algorithm_str = "sip";
- break;
- case RSPAMD_SHINGLES_XXHASH:
- rule->algorithm_str = "xx";
- break;
- case RSPAMD_SHINGLES_MUMHASH:
- rule->algorithm_str = "mum";
- break;
- case RSPAMD_SHINGLES_FAST:
- rule->algorithm_str = "fast";
- break;
- }
-
- if ((value = ucl_object_lookup (obj, "servers")) != NULL) {
- rule->servers = rspamd_upstreams_create (cfg->ups_ctx);
-
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool,
- (rspamd_mempool_destruct_t)rspamd_upstreams_destroy,
- rule->servers);
- if (!rspamd_upstreams_from_ucl (rule->servers, value, DEFAULT_PORT, NULL)) {
- msg_err_config ("cannot read servers definition");
- return -1;
- }
- }
- if ((value = ucl_object_lookup (obj, "fuzzy_map")) != NULL) {
- it = NULL;
- while ((cur = ucl_object_iterate (value, &it, true)) != NULL) {
- parse_flags (rule, cfg, cur, cb_id);
- }
- }
-
- if ((value = ucl_object_lookup (obj, "encryption_key")) != NULL) {
- /* Create key from user's input */
- k = ucl_object_tostring (value);
-
- if (k == NULL || (rule->peer_key =
- rspamd_pubkey_from_base32 (k, 0, RSPAMD_KEYPAIR_KEX,
- RSPAMD_CRYPTOBOX_MODE_25519)) == NULL) {
- msg_err_config ("bad encryption key value: %s",
- k);
- return -1;
- }
-
- rule->local_key = rspamd_keypair_new (RSPAMD_KEYPAIR_KEX,
- RSPAMD_CRYPTOBOX_MODE_25519);
- }
-
- if ((value = ucl_object_lookup (obj, "learn_condition")) != NULL) {
- lua_script = ucl_object_tostring (value);
-
- if (lua_script) {
- if (luaL_dostring (cfg->lua_state, lua_script) != 0) {
- msg_err_config ("cannot execute lua script for fuzzy "
- "learn condition: %s", lua_tostring (cfg->lua_state, -1));
- }
- else {
- if (lua_type (cfg->lua_state, -1) == LUA_TFUNCTION) {
- rule->learn_condition_cb = luaL_ref (cfg->lua_state,
- LUA_REGISTRYINDEX);
- msg_info_config ("loaded learn condition script for fuzzy rule:"
- " %s", rule->name);
- }
- else {
- msg_err_config ("lua script must return "
- "function(task) and not %s",
- lua_typename (cfg->lua_state,
- lua_type (cfg->lua_state, -1)));
- }
- }
- }
- }
-
- key_str = NULL;
- if ((value = ucl_object_lookup (obj, "fuzzy_key")) != NULL) {
- /* Create key from user's input */
- key_str = ucl_object_tostring (value);
- }
-
- /* Setup keys */
- if (key_str == NULL) {
- /* Use some default key for all ops */
- key_str = "rspamd";
- }
-
- rule->hash_key = g_string_sized_new (rspamd_cryptobox_HASHBYTES);
- rspamd_cryptobox_hash (rule->hash_key->str, key_str, strlen (key_str), NULL, 0);
- rule->hash_key->len = rspamd_cryptobox_HASHKEYBYTES;
-
- shingles_key_str = NULL;
- if ((value = ucl_object_lookup (obj, "fuzzy_shingles_key")) != NULL) {
- shingles_key_str = ucl_object_tostring (value);
- }
- if (shingles_key_str == NULL) {
- shingles_key_str = "rspamd";
- }
-
- rule->shingles_key = g_string_sized_new (rspamd_cryptobox_HASHBYTES);
- rspamd_cryptobox_hash (rule->shingles_key->str, shingles_key_str,
- strlen (shingles_key_str), NULL, 0);
- rule->shingles_key->len = 16;
-
- if (rspamd_upstreams_count (rule->servers) == 0) {
- msg_err_config ("no servers defined for fuzzy rule with name: %s",
- rule->name);
- return -1;
- }
- else {
- g_ptr_array_add (fuzzy_module_ctx->fuzzy_rules, rule);
-
- if (rule->symbol != fuzzy_module_ctx->default_symbol) {
- rspamd_symbols_cache_add_symbol (cfg->cache, rule->symbol,
- 0,
- NULL, NULL,
- SYMBOL_TYPE_VIRTUAL|SYMBOL_TYPE_FINE,
- cb_id);
- }
-
- msg_info_config ("added fuzzy rule %s, key: %*xs, "
- "shingles_key: %*xs, algorithm: %s",
- rule->symbol,
- 6, rule->hash_key->str,
- 6, rule->shingles_key->str,
- rule->algorithm_str);
- }
-
- rspamd_mempool_add_destructor (fuzzy_module_ctx->fuzzy_pool, fuzzy_free_rule,
- rule);
-
- return 0;
- }
-
- gint
- fuzzy_check_module_init (struct rspamd_config *cfg, struct module_ctx **ctx)
- {
- lua_State *L = cfg->lua_state;
-
- if (fuzzy_module_ctx == NULL) {
- fuzzy_module_ctx = g_malloc0 (sizeof (struct fuzzy_ctx));
-
- fuzzy_module_ctx->fuzzy_pool = rspamd_mempool_new (rspamd_mempool_suggest_size (), NULL);
- /* TODO: this should match rules count actually */
- fuzzy_module_ctx->keypairs_cache = rspamd_keypair_cache_new (32);
- fuzzy_module_ctx->fuzzy_rules = g_ptr_array_new ();
- }
-
- fuzzy_module_ctx->cfg = cfg;
-
- *ctx = (struct module_ctx *)fuzzy_module_ctx;
-
- rspamd_rcl_add_doc_by_path (cfg,
- NULL,
- "Fuzzy check plugin",
- "fuzzy_check",
- UCL_OBJECT,
- NULL,
- 0,
- NULL,
- 0);
-
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Default symbol",
- "symbol",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Minimum number of *words* to check a text part",
- "min_length",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Minimum number of *bytes* to check a non-text part",
- "min_bytes",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Minimum height in pixels for embedded images to check using fuzzy storage",
- "min_height",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Minimum width in pixels for embedded images to check using fuzzy storage",
- "min_width",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Timeout for waiting reply from a fuzzy server",
- "timeout",
- UCL_TIME,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Maximum number of retransmits for a single request",
- "retransmits",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Whitelisted IPs map",
- "whitelist",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- /* Rules doc strings */
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check",
- "Fuzzy check rule",
- "rule",
- UCL_OBJECT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Headers that are used to make a separate hash",
- "headers",
- UCL_ARRAY,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Set of mime types (in form type/subtype, or type/*, or *) to check with fuzzy",
- "mime_types",
- UCL_ARRAY,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Maximum value for fuzzy hash when weight of symbol is exactly 1.0 (if value is higher then score is still 1.0)",
- "max_score",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "List of servers to check (or learn)",
- "servers",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "If true then never try to learn this fuzzy storage",
- "read_only",
- UCL_BOOLEAN,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "If true then ignore unknown flags and not add the default fuzzy symbol",
- "skip_unknown",
- UCL_BOOLEAN,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Default symbol for rule (if no flags defined or matched)",
- "symbol",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Base32 value for the protocol encryption public key",
- "encryption_key",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Base32 value for the hashing key (for private storages)",
- "fuzzy_key",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Base32 value for the shingles hashing key (for private storages)",
- "fuzzy_shingles_key",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Lua script that returns boolean function to check if this task "
- "should be considered when learning fuzzy storage",
- "learn_condition",
- UCL_STRING,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule",
- "Map of SYMBOL -> data for flags configuration",
- "fuzzy_map",
- UCL_OBJECT,
- NULL,
- 0,
- NULL,
- 0);
- /* Fuzzy map doc strings */
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule.fuzzy_map",
- "Maximum score for this flag",
- "max_score",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
- rspamd_rcl_add_doc_by_path (cfg,
- "fuzzy_check.rule.fuzzy_map",
- "Flag number",
- "flag",
- UCL_INT,
- NULL,
- 0,
- NULL,
- 0);
-
- /* Register global methods */
- lua_getglobal (L, "rspamd_plugins");
-
- if (lua_type (L, -1) == LUA_TTABLE) {
- lua_pushstring (L, "fuzzy_check");
- lua_createtable (L, 0, 2);
- /* Set methods */
- lua_pushstring (L, "unlearn");
- lua_pushcfunction (L, fuzzy_lua_unlearn_handler);
- lua_settable (L, -3);
- lua_pushstring (L, "learn");
- lua_pushcfunction (L, fuzzy_lua_learn_handler);
- lua_settable (L, -3);
- /* Finish fuzzy_check key */
- lua_settable (L, -3);
- }
-
- lua_pop (L, 1); /* Remove global function */
-
- return 0;
- }
-
- gint
- fuzzy_check_module_config (struct rspamd_config *cfg)
- {
- const ucl_object_t *value, *cur, *elt;
- ucl_object_iter_t it;
- gint res = TRUE, cb_id, nrules = 0;
-
- if (!rspamd_config_is_module_enabled (cfg, "fuzzy_check")) {
- return TRUE;
- }
-
- fuzzy_module_ctx->enabled = TRUE;
-
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check", "symbol")) != NULL) {
- fuzzy_module_ctx->default_symbol = ucl_obj_tostring (value);
- }
- else {
- fuzzy_module_ctx->default_symbol = DEFAULT_SYMBOL;
- }
-
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check",
- "min_length")) != NULL) {
- fuzzy_module_ctx->min_hash_len = ucl_obj_toint (value);
- }
- else {
- fuzzy_module_ctx->min_hash_len = 0;
- }
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check",
- "min_bytes")) != NULL) {
- fuzzy_module_ctx->min_bytes = ucl_obj_toint (value);
- }
- else {
- fuzzy_module_ctx->min_bytes = 0;
- }
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check",
- "min_height")) != NULL) {
- fuzzy_module_ctx->min_height = ucl_obj_toint (value);
- }
- else {
- fuzzy_module_ctx->min_height = 0;
- }
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check",
- "min_width")) != NULL) {
- fuzzy_module_ctx->min_width = ucl_obj_toint (value);
- }
- else {
- fuzzy_module_ctx->min_width = 0;
- }
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check", "timeout")) != NULL) {
- fuzzy_module_ctx->io_timeout = ucl_obj_todouble (value) * 1000;
- }
- else {
- fuzzy_module_ctx->io_timeout = DEFAULT_IO_TIMEOUT;
- }
-
- if ((value =
- rspamd_config_get_module_opt (cfg,
- "fuzzy_check",
- "retransmits")) != NULL) {
- fuzzy_module_ctx->retransmits = ucl_obj_toint (value);
- }
- else {
- fuzzy_module_ctx->retransmits = DEFAULT_RETRANSMITS;
- }
-
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check",
- "whitelist")) != NULL) {
- rspamd_config_radix_from_ucl (cfg, value, "Fuzzy whitelist",
- &fuzzy_module_ctx->whitelist, NULL);
- }
- else {
- fuzzy_module_ctx->whitelist = NULL;
- }
-
- if ((value =
- rspamd_config_get_module_opt (cfg, "fuzzy_check", "rule")) != NULL) {
-
- cb_id = rspamd_symbols_cache_add_symbol (cfg->cache,
- "FUZZY_CALLBACK", 0, fuzzy_symbol_callback, NULL,
- SYMBOL_TYPE_CALLBACK|SYMBOL_TYPE_FINE,
- -1);
-
- /*
- * Here we can have 2 possibilities:
- *
- * unnamed rules:
- *
- * rule {
- * ...
- * }
- * rule {
- * ...
- * }
- *
- * - or - named rules:
- *
- * rule {
- * "rule1": {
- * ...
- * }
- * "rule2": {
- * ...
- * }
- * }
- *
- * So, for each element, we check, if there 'servers' key. If 'servers' is
- * presented, then we treat it as unnamed rule, otherwise we treat it as
- * named rule.
- */
- LL_FOREACH (value, cur) {
-
- if (ucl_object_lookup (cur, "servers")) {
- /* Unnamed rule */
- fuzzy_parse_rule (cfg, cur, NULL, cb_id);
- nrules ++;
- }
- else {
- /* Named rule */
- it = NULL;
-
- while ((elt = ucl_object_iterate (cur, &it, true)) != NULL) {
- fuzzy_parse_rule (cfg, elt, ucl_object_key (elt), cb_id);
- nrules ++;
- }
- }
- }
- }
-
- if (fuzzy_module_ctx->fuzzy_rules == NULL) {
- msg_warn_config ("fuzzy module is enabled but no rules are defined");
- }
-
- msg_info_config ("init internal fuzzy_check module, %d rules loaded",
- nrules);
-
- return res;
- }
-
- gint
- fuzzy_check_module_reconfig (struct rspamd_config *cfg)
- {
- struct module_ctx saved_ctx;
-
- saved_ctx = fuzzy_module_ctx->ctx;
- rspamd_mempool_delete (fuzzy_module_ctx->fuzzy_pool);
- rspamd_keypair_cache_destroy (fuzzy_module_ctx->keypairs_cache);
- g_ptr_array_free (fuzzy_module_ctx->fuzzy_rules, TRUE);
- memset (fuzzy_module_ctx, 0, sizeof (*fuzzy_module_ctx));
- fuzzy_module_ctx->ctx = saved_ctx;
- fuzzy_module_ctx->fuzzy_pool = rspamd_mempool_new (rspamd_mempool_suggest_size (), NULL);
- fuzzy_module_ctx->cfg = cfg;
- fuzzy_module_ctx->fuzzy_rules = g_ptr_array_new ();
- fuzzy_module_ctx->keypairs_cache = rspamd_keypair_cache_new (32);
-
- return fuzzy_check_module_config (cfg);
- }
-
- /* Finalize IO */
- static void
- fuzzy_io_fin (void *ud)
- {
- struct fuzzy_client_session *session = ud;
-
- if (session->commands) {
- g_ptr_array_free (session->commands, TRUE);
- }
-
- event_del (&session->ev);
- event_del (&session->timev);
- close (session->fd);
- }
-
- static GArray *
- fuzzy_preprocess_words (struct rspamd_mime_text_part *part, rspamd_mempool_t *pool)
- {
- return part->normalized_words;
- }
-
- static void
- fuzzy_encrypt_cmd (struct fuzzy_rule *rule,
- struct rspamd_fuzzy_encrypted_req_hdr *hdr,
- guchar *data, gsize datalen)
- {
- const guchar *pk;
- guint pklen;
-
- g_assert (hdr != NULL);
- g_assert (data != NULL);
- g_assert (rule != NULL);
-
- /* Encrypt data */
- memcpy (hdr->magic,
- fuzzy_encrypted_magic,
- sizeof (hdr->magic));
- ottery_rand_bytes (hdr->nonce, sizeof (hdr->nonce));
- pk = rspamd_keypair_component (rule->local_key,
- RSPAMD_KEYPAIR_COMPONENT_PK, &pklen);
- memcpy (hdr->pubkey, pk, MIN (pklen, sizeof (hdr->pubkey)));
- pk = rspamd_pubkey_get_pk (rule->peer_key, &pklen);
- memcpy (hdr->key_id, pk, MIN (sizeof (hdr->key_id), pklen));
- rspamd_keypair_cache_process (fuzzy_module_ctx->keypairs_cache,
- rule->local_key, rule->peer_key);
- rspamd_cryptobox_encrypt_nm_inplace (data, datalen,
- hdr->nonce, rspamd_pubkey_get_nm (rule->peer_key), hdr->mac,
- rspamd_pubkey_alg (rule->peer_key));
- }
-
- static struct fuzzy_cmd_io *
- fuzzy_cmd_stat (struct fuzzy_rule *rule,
- int c,
- gint flag,
- guint32 weight,
- rspamd_mempool_t *pool)
- {
- struct rspamd_fuzzy_cmd *cmd;
- struct rspamd_fuzzy_encrypted_cmd *enccmd;
- struct fuzzy_cmd_io *io;
-
- if (rule->peer_key) {
- enccmd = rspamd_mempool_alloc0 (pool, sizeof (*enccmd));
- cmd = &enccmd->cmd;
- }
- else {
- cmd = rspamd_mempool_alloc0 (pool, sizeof (*cmd));
- }
-
- cmd->cmd = c;
- cmd->version = RSPAMD_FUZZY_PLUGIN_VERSION;
- cmd->shingles_count = 0;
- cmd->tag = ottery_rand_uint32 ();
-
- io = rspamd_mempool_alloc (pool, sizeof (*io));
- io->flags = 0;
- io->tag = cmd->tag;
- memcpy (&io->cmd, cmd, sizeof (io->cmd));
-
- if (rule->peer_key) {
- fuzzy_encrypt_cmd (rule, &enccmd->hdr, (guchar *)cmd, sizeof (*cmd));
- io->io.iov_base = enccmd;
- io->io.iov_len = sizeof (*enccmd);
- }
- else {
- io->io.iov_base = cmd;
- io->io.iov_len = sizeof (*cmd);
- }
-
- return io;
- }
-
- static struct fuzzy_cmd_io *
- fuzzy_cmd_hash (struct fuzzy_rule *rule,
- int c,
- const rspamd_ftok_t *hash,
- gint flag,
- guint32 weight,
- rspamd_mempool_t *pool)
- {
- struct rspamd_fuzzy_cmd *cmd;
- struct rspamd_fuzzy_encrypted_cmd *enccmd;
- struct fuzzy_cmd_io *io;
-
- if (rule->peer_key) {
- enccmd = rspamd_mempool_alloc0 (pool, sizeof (*enccmd));
- cmd = &enccmd->cmd;
- }
- else {
- cmd = rspamd_mempool_alloc0 (pool, sizeof (*cmd));
- }
-
- if (hash->len == sizeof (cmd->digest) * 2) {
- /* It is hex encoding */
- if (rspamd_decode_hex_buf (hash->begin, hash->len, cmd->digest,
- sizeof (cmd->digest)) == -1) {
- msg_err_pool ("cannot decode hash, wrong encoding");
- return NULL;
- }
- }
- else {
- msg_err_pool ("cannot decode hash, wrong length: %z", hash->len);
- return NULL;
- }
-
- cmd->cmd = c;
- cmd->version = RSPAMD_FUZZY_PLUGIN_VERSION;
- cmd->shingles_count = 0;
- cmd->tag = ottery_rand_uint32 ();
-
- io = rspamd_mempool_alloc (pool, sizeof (*io));
- io->flags = 0;
- io->tag = cmd->tag;
-
- memcpy (&io->cmd, cmd, sizeof (io->cmd));
-
- if (rule->peer_key) {
- fuzzy_encrypt_cmd (rule, &enccmd->hdr, (guchar *)cmd, sizeof (*cmd));
- io->io.iov_base = enccmd;
- io->io.iov_len = sizeof (*enccmd);
- }
- else {
- io->io.iov_base = cmd;
- io->io.iov_len = sizeof (*cmd);
- }
-
- return io;
- }
-
- static void *
- fuzzy_cmd_get_cached (struct fuzzy_rule *rule,
- rspamd_mempool_t *pool,
- gpointer p)
- {
- gchar key[32];
- gint key_part;
-
- memcpy (&key_part, rule->shingles_key->str, sizeof (key_part));
- rspamd_snprintf (key, sizeof (key), "%p%s%d", p, rule->algorithm_str,
- key_part);
-
- return rspamd_mempool_get_variable (pool, key);
- }
-
- static void
- fuzzy_cmd_set_cached (struct fuzzy_rule *rule,
- rspamd_mempool_t *pool,
- gpointer p,
- struct rspamd_fuzzy_encrypted_shingle_cmd *data)
- {
- gchar key[32];
- gint key_part;
-
- memcpy (&key_part, rule->shingles_key->str, sizeof (key_part));
- rspamd_snprintf (key, sizeof (key), "%p%s%d", p, rule->algorithm_str,
- key_part);
- /* Key is copied */
- rspamd_mempool_set_variable (pool, key, data, NULL);
- }
-
- /*
- * Create fuzzy command from a text part
- */
- static struct fuzzy_cmd_io *
- fuzzy_cmd_from_text_part (struct fuzzy_rule *rule,
- int c,
- gint flag,
- guint32 weight,
- rspamd_mempool_t *pool,
- struct rspamd_mime_text_part *part)
- {
- struct rspamd_fuzzy_shingle_cmd *shcmd;
- struct rspamd_fuzzy_encrypted_shingle_cmd *encshcmd, *cached;
- struct rspamd_shingle *sh;
- guint i;
- rspamd_cryptobox_hash_state_t st;
- rspamd_ftok_t *word;
- GArray *words;
- struct fuzzy_cmd_io *io;
-
- cached = fuzzy_cmd_get_cached (rule, pool, part);
-
- if (cached) {
- /* Copy cached */
- encshcmd = rspamd_mempool_alloc (pool, sizeof (*encshcmd));
- memcpy (encshcmd, cached, sizeof (*encshcmd));
- shcmd = &encshcmd->cmd;
- }
- else {
- encshcmd = rspamd_mempool_alloc0 (pool, sizeof (*encshcmd));
- shcmd = &encshcmd->cmd;
-
- /*
- * Generate hash from all words in the part
- */
- rspamd_cryptobox_hash_init (&st, rule->hash_key->str, rule->hash_key->len);
- words = fuzzy_preprocess_words (part, pool);
-
- for (i = 0; i < words->len; i ++) {
- word = &g_array_index (words, rspamd_ftok_t, i);
- rspamd_cryptobox_hash_update (&st, word->begin, word->len);
- }
- rspamd_cryptobox_hash_final (&st, shcmd->basic.digest);
-
- msg_debug_pool ("loading shingles of type %s with key %*xs",
- rule->algorithm_str,
- 16, rule->shingles_key->str);
- sh = rspamd_shingles_from_text (words,
- rule->shingles_key->str, pool,
- rspamd_shingles_default_filter, NULL,
- rule->alg);
- if (sh != NULL) {
- memcpy (&shcmd->sgl, sh, sizeof (shcmd->sgl));
- shcmd->basic.shingles_count = RSPAMD_SHINGLE_SIZE;
- }
-
- /*
- * We always save encrypted command as it can handle both
- * encrypted and unencrypted requests.
- *
- * Since it is copied when obtained from the cache, it is safe to use
- * it this way.
- */
- fuzzy_cmd_set_cached (rule, pool, part, encshcmd);
- }
-
- shcmd->basic.tag = ottery_rand_uint32 ();
- shcmd->basic.cmd = c;
- shcmd->basic.version = RSPAMD_FUZZY_PLUGIN_VERSION;
-
- if (c != FUZZY_CHECK) {
- shcmd->basic.flag = flag;
- shcmd->basic.value = weight;
- }
-
- io = rspamd_mempool_alloc (pool, sizeof (*io));
- io->tag = shcmd->basic.tag;
- io->flags = 0;
- memcpy (&io->cmd, &shcmd->basic, sizeof (io->cmd));
-
- if (rule->peer_key) {
- /* Encrypt data */
- fuzzy_encrypt_cmd (rule, &encshcmd->hdr, (guchar *) shcmd, sizeof (*shcmd));
- io->io.iov_base = encshcmd;
- io->io.iov_len = sizeof (*encshcmd);
- }
- else {
- io->io.iov_base = shcmd;
- io->io.iov_len = sizeof (*shcmd);
- }
-
- return io;
- }
-
- static struct fuzzy_cmd_io *
- fuzzy_cmd_from_image_part (struct fuzzy_rule *rule,
- int c,
- gint flag,
- guint32 weight,
- rspamd_mempool_t *pool,
- struct rspamd_image *img)
- {
- struct rspamd_fuzzy_shingle_cmd *shcmd;
- struct rspamd_fuzzy_encrypted_shingle_cmd *encshcmd, *cached;
- struct fuzzy_cmd_io *io;
- struct rspamd_shingle *sh;
-
- cached = fuzzy_cmd_get_cached (rule, pool, img);
-
- if (cached) {
- /* Copy cached */
- encshcmd = rspamd_mempool_alloc (pool, sizeof (*encshcmd));
- memcpy (encshcmd, cached, sizeof (*encshcmd));
- shcmd = &encshcmd->cmd;
- }
- else {
- encshcmd = rspamd_mempool_alloc0 (pool, sizeof (*encshcmd));
- shcmd = &encshcmd->cmd;
-
- /*
- * Generate shingles
- */
- sh = rspamd_shingles_from_image (img->dct,
- rule->shingles_key->str, pool,
- rspamd_shingles_default_filter, NULL,
- rule->alg);
- if (sh != NULL) {
- memcpy (&shcmd->sgl, sh->hashes, sizeof (shcmd->sgl));
- shcmd->basic.shingles_count = RSPAMD_SHINGLE_SIZE;
- #if 0
- for (unsigned int i = 0; i < RSPAMD_SHINGLE_SIZE; i ++) {
- msg_err ("shingle %d: %L", i, sh->hashes[i]);
- }
- #endif
- }
-
- rspamd_cryptobox_hash (shcmd->basic.digest,
- (const guchar *)img->dct, RSPAMD_DCT_LEN / NBBY,
- rule->hash_key->str, rule->hash_key->len);
-
- msg_debug_pool ("loading shingles of type %s with key %*xs",
- rule->algorithm_str,
- 16, rule->shingles_key->str);
-
- /*
- * We always save encrypted command as it can handle both
- * encrypted and unencrypted requests.
- *
- * Since it is copied when obtained from the cache, it is safe to use
- * it this way.
- */
- fuzzy_cmd_set_cached (rule, pool, img, encshcmd);
- }
-
- shcmd->basic.tag = ottery_rand_uint32 ();
- shcmd->basic.cmd = c;
- shcmd->basic.version = RSPAMD_FUZZY_PLUGIN_VERSION;
-
- if (c != FUZZY_CHECK) {
- shcmd->basic.flag = flag;
- shcmd->basic.value = weight;
- }
-
- io = rspamd_mempool_alloc (pool, sizeof (*io));
- io->tag = shcmd->basic.tag;
- io->flags = FUZZY_CMD_FLAG_IMAGE;
- memcpy (&io->cmd, &shcmd->basic, sizeof (io->cmd));
-
- if (rule->peer_key) {
- /* Encrypt data */
- fuzzy_encrypt_cmd (rule, &encshcmd->hdr, (guchar *) shcmd, sizeof (*shcmd));
- io->io.iov_base = encshcmd;
- io->io.iov_len = sizeof (*encshcmd);
- }
- else {
- io->io.iov_base = shcmd;
- io->io.iov_len = sizeof (*shcmd);
- }
-
- return io;
- }
-
- static struct fuzzy_cmd_io *
- fuzzy_cmd_from_data_part (struct fuzzy_rule *rule,
- int c,
- gint flag,
- guint32 weight,
- rspamd_mempool_t *pool,
- guchar digest[rspamd_cryptobox_HASHBYTES])
- {
- struct rspamd_fuzzy_cmd *cmd;
- struct rspamd_fuzzy_encrypted_cmd *enccmd = NULL;
- struct fuzzy_cmd_io *io;
-
- if (rule->peer_key) {
- enccmd = rspamd_mempool_alloc0 (pool, sizeof (*enccmd));
- cmd = &enccmd->cmd;
- }
- else {
- cmd = rspamd_mempool_alloc0 (pool, sizeof (*cmd));
- }
-
- cmd->cmd = c;
- cmd->version = RSPAMD_FUZZY_PLUGIN_VERSION;
- if (c != FUZZY_CHECK) {
- cmd->flag = flag;
- cmd->value = weight;
- }
- cmd->shingles_count = 0;
- cmd->tag = ottery_rand_uint32 ();
- memcpy (cmd->digest, digest, sizeof (cmd->digest));
-
- io = rspamd_mempool_alloc (pool, sizeof (*io));
- io->flags = 0;
- io->tag = cmd->tag;
- memcpy (&io->cmd, cmd, sizeof (io->cmd));
-
- if (rule->peer_key) {
- g_assert (enccmd != NULL);
- fuzzy_encrypt_cmd (rule, &enccmd->hdr, (guchar *) cmd, sizeof (*cmd));
- io->io.iov_base = enccmd;
- io->io.iov_len = sizeof (*enccmd);
- }
- else {
- io->io.iov_base = cmd;
- io->io.iov_len = sizeof (*cmd);
- }
-
- return io;
- }
-
- static gboolean
- fuzzy_cmd_to_wire (gint fd, struct iovec *io)
- {
- struct msghdr msg;
-
- memset (&msg, 0, sizeof (msg));
- msg.msg_iov = io;
- msg.msg_iovlen = 1;
-
- while (sendmsg (fd, &msg, 0) == -1) {
- if (errno == EINTR) {
- continue;
- }
- return FALSE;
- }
-
- return TRUE;
- }
-
- static gboolean
- fuzzy_cmd_vector_to_wire (gint fd, GPtrArray *v)
- {
- guint i;
- gboolean all_sent = TRUE, all_replied = TRUE;
- struct fuzzy_cmd_io *io;
- gboolean processed = FALSE;
-
- /* First try to resend unsent commands */
- for (i = 0; i < v->len; i ++) {
- io = g_ptr_array_index (v, i);
-
- if (io->flags & FUZZY_CMD_FLAG_REPLIED) {
- continue;
- }
-
- all_replied = FALSE;
-
- if (!(io->flags & FUZZY_CMD_FLAG_SENT)) {
- if (!fuzzy_cmd_to_wire (fd, &io->io)) {
- return FALSE;
- }
- processed = TRUE;
- io->flags |= FUZZY_CMD_FLAG_SENT;
- all_sent = FALSE;
- }
- }
-
- if (all_sent && !all_replied) {
- /* Now try to resend each command in the vector */
- for (i = 0; i < v->len; i++) {
- io = g_ptr_array_index (v, i);
-
- if (!(io->flags & FUZZY_CMD_FLAG_REPLIED)) {
- io->flags &= ~FUZZY_CMD_FLAG_SENT;
- }
- }
-
- return fuzzy_cmd_vector_to_wire (fd, v);
- }
-
- return processed;
- }
-
- /*
- * Read replies one-by-one and remove them from req array
- */
- static const struct rspamd_fuzzy_reply *
- fuzzy_process_reply (guchar **pos, gint *r, GPtrArray *req,
- struct fuzzy_rule *rule, struct rspamd_fuzzy_cmd **pcmd,
- struct fuzzy_cmd_io **pio)
- {
- guchar *p = *pos;
- gint remain = *r;
- guint i, required_size;
- struct fuzzy_cmd_io *io;
- const struct rspamd_fuzzy_reply *rep;
- struct rspamd_fuzzy_encrypted_reply encrep;
- gboolean found = FALSE;
-
- if (rule->peer_key) {
- required_size = sizeof (encrep);
- }
- else {
- required_size = sizeof (*rep);
- }
-
- if (remain <= 0 || (guint)remain < required_size) {
- return NULL;
- }
-
- if (rule->peer_key) {
- memcpy (&encrep, p, sizeof (encrep));
- *pos += required_size;
- *r -= required_size;
-
- /* Try to decrypt reply */
- rspamd_keypair_cache_process (fuzzy_module_ctx->keypairs_cache,
- rule->local_key, rule->peer_key);
-
- if (!rspamd_cryptobox_decrypt_nm_inplace ((guchar *)&encrep.rep,
- sizeof (encrep.rep),
- encrep.hdr.nonce,
- rspamd_pubkey_get_nm (rule->peer_key),
- encrep.hdr.mac,
- rspamd_pubkey_alg (rule->peer_key))) {
- msg_info ("cannot decrypt reply");
- return NULL;
- }
-
- /* Copy decrypted over the input wire */
- memcpy (p, &encrep.rep, sizeof (encrep.rep));
- }
- else {
-
- *pos += required_size;
- *r -= required_size;
- }
-
- rep = (const struct rspamd_fuzzy_reply *) p;
- /*
- * Search for tag
- */
- for (i = 0; i < req->len; i ++) {
- io = g_ptr_array_index (req, i);
-
- if (io->tag == rep->tag) {
- if (!(io->flags & FUZZY_CMD_FLAG_REPLIED)) {
- io->flags |= FUZZY_CMD_FLAG_REPLIED;
-
- if (pcmd) {
- *pcmd = &io->cmd;
- }
-
- if (pio) {
- *pio = io;
- }
-
- return rep;
- }
- found = TRUE;
- }
- }
-
- if (!found) {
- msg_info ("unexpected tag: %ud", rep->tag);
- }
-
- return NULL;
- }
-
- static void
- fuzzy_insert_result (struct fuzzy_client_session *session,
- const struct rspamd_fuzzy_reply *rep,
- struct rspamd_fuzzy_cmd *cmd,
- struct fuzzy_cmd_io *io,
- guint flag)
- {
- const gchar *symbol;
- struct fuzzy_mapping *map;
- struct rspamd_task *task = session->task;
- double nval;
- guchar buf[2048];
- const gchar *type = "bin";
-
- /* Get mapping by flag */
- if ((map =
- g_hash_table_lookup (session->rule->mappings,
- GINT_TO_POINTER (rep->flag))) == NULL) {
- /* Default symbol and default weight */
- symbol = session->rule->symbol;
-
- }
- else {
- /* Get symbol and weight from map */
- symbol = map->symbol;
- }
-
-
- /*
- * Hash is assumed to be found if probability is more than 0.5
- * In that case `value` means number of matches
- * Otherwise `value` means error code
- */
-
- nval = fuzzy_normalize (rep->value,
- session->rule->max_score);
-
- if (io && (io->flags & FUZZY_CMD_FLAG_IMAGE)) {
- nval *= rspamd_normalize_probability (rep->prob, 0.5);
- type = "img";
- }
- else {
- /* XXX: we need something better here */
- if (cmd->shingles_count > 0) {
- type = "txt";
- }
-
- nval *= rep->prob;
- }
-
- msg_info_task (
- "found fuzzy hash(%s) %*xs with weight: "
- "%.2f, probability %.2f, in list: %s:%d%s",
- type,
- (gint)sizeof (cmd->digest), cmd->digest,
- nval,
- (gdouble)rep->prob,
- symbol,
- rep->flag,
- map == NULL ? "(unknown)" : "");
- if (map != NULL || !session->rule->skip_unknown) {
- rspamd_snprintf (buf,
- sizeof (buf),
- "%d:%*xs:%.2f:%s",
- rep->flag,
- rspamd_fuzzy_hash_len, cmd->digest,
- rep->prob,
- type);
- rspamd_task_insert_result_single (session->task,
- symbol,
- nval,
- buf);
- }
- }
-
- static gint
- fuzzy_check_try_read (struct fuzzy_client_session *session)
- {
- struct rspamd_task *task;
- const struct rspamd_fuzzy_reply *rep;
- struct rspamd_fuzzy_cmd *cmd = NULL;
- struct fuzzy_cmd_io *io = NULL;
- gint r, ret;
- guchar buf[2048], *p;
-
- task = session->task;
-
- if ((r = read (session->fd, buf, sizeof (buf) - 1)) == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
- return 0;
- }
- else {
- return -1;
- }
- }
- else {
- p = buf;
-
- ret = 0;
-
- while ((rep = fuzzy_process_reply (&p, &r,
- session->commands, session->rule, &cmd, &io)) != NULL) {
- if (rep->prob > 0.5) {
- if (cmd->cmd == FUZZY_CHECK) {
- fuzzy_insert_result (session, rep, cmd, io, rep->flag);
- }
- else if (cmd->cmd == FUZZY_STAT) {
- /* Just set pool variable to extract it in further */
- struct rspamd_fuzzy_stat_entry *pval;
- GList *res;
-
- pval = rspamd_mempool_alloc (task->task_pool, sizeof (*pval));
- pval->fuzzy_cnt = rep->flag;
- pval->name = session->rule->name;
-
- res = rspamd_mempool_get_variable (task->task_pool, "fuzzy_stat");
-
- if (res == NULL) {
- res = g_list_append (NULL, pval);
- rspamd_mempool_set_variable (task->task_pool, "fuzzy_stat",
- res, (rspamd_mempool_destruct_t)g_list_free);
- }
- else {
- res = g_list_append (res, pval);
- }
- }
- }
- else if (rep->value == 403) {
- msg_info_task (
- "fuzzy check error for %d: forbidden",
- rep->flag);
- }
- else if (rep->value != 0) {
- msg_info_task (
- "fuzzy check error for %d: unknown error (%d)",
- rep->flag,
- rep->value);
- }
-
- ret = 1;
- }
- }
-
- return ret;
- }
-
- static gboolean
- fuzzy_check_session_is_completed (struct fuzzy_client_session *session)
- {
- struct fuzzy_cmd_io *io;
- guint nreplied = 0, i;
-
- rspamd_upstream_ok (session->server);
-
- for (i = 0; i < session->commands->len; i++) {
- io = g_ptr_array_index (session->commands, i);
-
- if (io->flags & FUZZY_CMD_FLAG_REPLIED) {
- nreplied++;
- }
- }
-
- if (nreplied == session->commands->len) {
- rspamd_session_remove_event (session->task->s, fuzzy_io_fin, session);
-
- return TRUE;
- }
-
- return FALSE;
- }
-
- /* Fuzzy check callback */
- static void
- fuzzy_check_io_callback (gint fd, short what, void *arg)
- {
- struct fuzzy_client_session *session = arg;
- struct rspamd_task *task;
- struct event_base *ev_base;
- gint r;
-
- enum {
- return_error = 0,
- return_want_more,
- return_finished
- } ret = return_error;
-
- task = session->task;
-
- if ((what & EV_READ) || session->state == 1) {
- /* Try to read reply */
- r = fuzzy_check_try_read (session);
-
- switch (r) {
- case 0:
- ret = return_want_more;
- break;
- case 1:
- ret = return_finished;
- break;
- default:
- ret = return_error;
- break;
- }
- }
- else if (what & EV_WRITE) {
- if (!fuzzy_cmd_vector_to_wire (fd, session->commands)) {
- ret = return_error;
- }
- else {
- session->state = 1;
- ret = return_want_more;
- }
- }
- else {
- /* Should not happen */
- g_assert (0);
- }
-
- if (ret == return_want_more) {
- /* Processed write, switch to reading */
- ev_base = event_get_base (&session->ev);
- event_del (&session->ev);
- event_set (&session->ev, fd, EV_READ,
- fuzzy_check_io_callback, session);
- event_base_set (ev_base, &session->ev);
- event_add (&session->ev, NULL);
- }
- else if (ret == return_error) {
- /* Error state */
- msg_err_task ("got error on IO with server %s(%s), on %s, %d, %s",
- rspamd_upstream_name (session->server),
- rspamd_inet_address_to_string (session->addr),
- session->state == 1 ? "read" : "write",
- errno,
- strerror (errno));
- rspamd_upstream_fail (session->server);
- rspamd_session_remove_event (session->task->s, fuzzy_io_fin, session);
- }
- else {
- /* Read something from network */
- if (!fuzzy_check_session_is_completed (session)) {
- /* Need to read more */
- ev_base = event_get_base (&session->ev);
- event_del (&session->ev);
- event_set (&session->ev, session->fd, EV_READ,
- fuzzy_check_io_callback, session);
- event_base_set (ev_base, &session->ev);
- event_add (&session->ev, NULL);
- }
- }
- }
-
- /* Fuzzy check timeout callback */
- static void
- fuzzy_check_timer_callback (gint fd, short what, void *arg)
- {
- struct fuzzy_client_session *session = arg;
- struct rspamd_task *task;
- struct event_base *ev_base;
-
- task = session->task;
-
- /* We might be here because of other checks being slow */
- if (fuzzy_check_try_read (session) > 0) {
- if (fuzzy_check_session_is_completed (session)) {
- return;
- }
- }
-
- if (session->retransmits >= fuzzy_module_ctx->retransmits) {
- msg_err_task ("got IO timeout with server %s(%s), after %d retransmits",
- rspamd_upstream_name (session->server),
- rspamd_inet_address_to_string (session->addr),
- session->retransmits);
- rspamd_upstream_fail (session->server);
- rspamd_session_remove_event (session->task->s, fuzzy_io_fin, session);
- }
- else {
- /* Plan write event */
- ev_base = event_get_base (&session->ev);
- event_del (&session->ev);
- event_set (&session->ev, fd, EV_WRITE|EV_READ,
- fuzzy_check_io_callback, session);
- event_base_set (ev_base, &session->ev);
- event_add (&session->ev, NULL);
-
- /* Plan new retransmit timer */
- ev_base = event_get_base (&session->timev);
- event_del (&session->timev);
- event_base_set (ev_base, &session->timev);
- event_add (&session->timev, &session->tv);
- session->retransmits ++;
- }
- }
-
- static void
- fuzzy_lua_fin (void *ud)
- {
- struct fuzzy_learn_session *session = ud;
-
- (*session->saved)--;
-
- event_del (&session->ev);
- event_del (&session->timev);
- close (session->fd);
- }
-
- /* Controller IO */
- static void
- fuzzy_controller_io_callback (gint fd, short what, void *arg)
- {
- struct fuzzy_learn_session *session = arg;
- const struct rspamd_fuzzy_reply *rep;
- struct fuzzy_mapping *map;
- struct rspamd_task *task;
- guchar buf[2048], *p;
- struct fuzzy_cmd_io *io;
- struct rspamd_fuzzy_cmd *cmd = NULL;
- const gchar *symbol, *ftype;
- struct event_base *ev_base;
- gint r;
- enum {
- return_error = 0,
- return_want_more,
- return_finished
- } ret = return_want_more;
- guint i, nreplied;
-
- task = session->task;
-
- if (what & EV_READ) {
- if ((r = read (fd, buf, sizeof (buf) - 1)) == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
- event_add (&session->ev, NULL);
- return;
- }
-
- msg_info_task ("cannot process fuzzy hash for message <%s>: %s",
- session->task->message_id, strerror (errno));
- if (*(session->err) == NULL) {
- g_set_error (session->err,
- g_quark_from_static_string ("fuzzy check"),
- errno, "read socket error: %s", strerror (errno));
- }
- ret = return_error;
- }
- else {
- p = buf;
- ret = return_want_more;
-
- while ((rep = fuzzy_process_reply (&p, &r,
- session->commands, session->rule, &cmd, &io)) != NULL) {
- if ((map =
- g_hash_table_lookup (session->rule->mappings,
- GINT_TO_POINTER (rep->flag))) == NULL) {
- /* Default symbol and default weight */
- symbol = session->rule->symbol;
-
- }
- else {
- /* Get symbol and weight from map */
- symbol = map->symbol;
- }
-
- ftype = "bin";
-
- if (io && (io->flags & FUZZY_CMD_FLAG_IMAGE)) {
- ftype = "img";
- }
- else if (cmd->shingles_count > 0) {
- ftype = "txt";
- }
-
- if (rep->prob > 0.5) {
- msg_info_task ("processed fuzzy hash (%s) %*xs, list: %s:%d for "
- "message <%s>",
- ftype,
- (gint)sizeof (cmd->digest), cmd->digest,
- symbol,
- rep->flag,
- session->task->message_id);
- }
- else {
- msg_info_task ("cannot process fuzzy hash (%s) for message "
- "<%s>, %*xs, "
- "list %s:%d, error: %d",
- ftype,
- session->task->message_id,
- (gint)sizeof (cmd->digest), cmd->digest,
- symbol,
- rep->flag,
- rep->value);
-
- if (*(session->err) == NULL) {
- g_set_error (session->err,
- g_quark_from_static_string ("fuzzy check"),
- rep->value, "process fuzzy error");
- }
-
- ret = return_finished;
- }
- }
-
- nreplied = 0;
-
- for (i = 0; i < session->commands->len; i++) {
- io = g_ptr_array_index (session->commands, i);
-
- if (io->flags & FUZZY_CMD_FLAG_REPLIED) {
- nreplied++;
- }
- }
-
- if (nreplied == session->commands->len) {
- ret = return_finished;
- }
- }
- }
- else if (what & EV_WRITE) {
- /* Send commands to storage */
- if (!fuzzy_cmd_vector_to_wire (fd, session->commands)) {
- if (*(session->err) == NULL) {
- g_set_error (session->err,
- g_quark_from_static_string ("fuzzy check"),
- errno, "write socket error: %s", strerror (errno));
- }
- ret = return_error;
- }
- }
- else {
- g_assert (0);
- }
-
- if (ret == return_want_more) {
- ev_base = event_get_base (&session->ev);
- event_del (&session->ev);
- event_set (&session->ev, fd, EV_READ,
- fuzzy_controller_io_callback, session);
- event_base_set (ev_base, &session->ev);
- event_add (&session->ev, NULL);
-
- return;
- }
- else if (ret == return_error) {
- msg_err_task ("got error in IO with server %s(%s), %d, %s",
- rspamd_upstream_name (session->server),
- rspamd_inet_address_to_string (session->addr),
- errno, strerror (errno));
- rspamd_upstream_fail (session->server);
- }
-
- /*
- * XXX: actually, we check merely a single reply, which is not correct...
- * XXX: when we send a command, we do not check if *all* commands have been
- * written
- * XXX: please, please, change this code some day
- */
-
- if (session->session == NULL) {
- (*session->saved)--;
-
- if (session->http_entry) {
- rspamd_http_connection_unref (session->http_entry->conn);
- }
-
- event_del (&session->ev);
- event_del (&session->timev);
- close (session->fd);
-
- if (*session->saved == 0) {
- goto cleanup;
- }
- }
- else {
- /* Lua handler */
- rspamd_session_remove_event (session->session, fuzzy_lua_fin, session);
- }
-
- return;
-
- cleanup:
- /*
- * When we send learn commands to fuzzy storages, this code is executed
- * *once* when we have queried all storages. We also don't know which
- * storage has been failed.
- *
- * Therefore, we cleanup sessions earlier and actually this code is wrong.
- */
-
- if (*(session->err) != NULL) {
- if (session->http_entry) {
- rspamd_controller_send_error (session->http_entry,
- (*session->err)->code, (*session->err)->message);
- }
-
- g_error_free (*session->err);
- }
- else {
- rspamd_upstream_ok (session->server);
-
- if (session->http_entry) {
- ucl_object_t *reply, *hashes;
- guint i;
- gchar hexbuf[rspamd_cryptobox_HASHBYTES * 2 + 1];
-
- reply = ucl_object_typed_new (UCL_OBJECT);
-
- ucl_object_insert_key (reply, ucl_object_frombool (true),
- "success", 0, false);
- hashes = ucl_object_typed_new (UCL_ARRAY);
-
- for (i = 0; i < session->commands->len; i ++) {
- io = g_ptr_array_index (session->commands, i);
-
- rspamd_snprintf (hexbuf, sizeof (hexbuf), "%*xs",
- (gint)sizeof (io->cmd.digest), io->cmd.digest);
- ucl_array_append (hashes, ucl_object_fromstring (hexbuf));
- }
-
- ucl_object_insert_key (reply, hashes, "hashes", 0, false);
- rspamd_controller_send_ucl (session->http_entry, reply);
- ucl_object_unref (reply);
- }
- }
-
- if (session->task != NULL) {
- if (session->http_entry) {
- rspamd_task_free (session->task);
- }
-
- session->task = NULL;
- }
-
- }
-
- static void
- fuzzy_controller_timer_callback (gint fd, short what, void *arg)
- {
- struct fuzzy_learn_session *session = arg;
- struct rspamd_task *task;
- struct event_base *ev_base;
-
- task = session->task;
-
- if (session->retransmits >= fuzzy_module_ctx->retransmits) {
- rspamd_upstream_fail (session->server);
- msg_err_task_check ("got IO timeout with server %s(%s), "
- "after %d retransmits",
- rspamd_upstream_name (session->server),
- rspamd_inet_address_to_string (session->addr),
- session->retransmits);
-
- if (session->session) {
- rspamd_session_remove_event (session->session, fuzzy_lua_fin,
- session);
- }
- else {
- if (session->http_entry) {
- rspamd_controller_send_error (session->http_entry,
- 500, "IO timeout with fuzzy storage");
- }
-
- if (*session->saved > 0 ) {
- (*session->saved)--;
- if (*session->saved == 0) {
- if (session->http_entry) {
- rspamd_task_free (session->task);
- }
-
- session->task = NULL;
- }
- }
-
- if (session->http_entry) {
- rspamd_http_connection_unref (session->http_entry->conn);
- }
-
- event_del (&session->ev);
- event_del (&session->timev);
- close (session->fd);
- }
- }
- else {
- /* Plan write event */
- ev_base = event_get_base (&session->ev);
- event_del (&session->ev);
- event_set (&session->ev, fd, EV_WRITE|EV_READ,
- fuzzy_controller_io_callback, session);
- event_base_set (ev_base, &session->ev);
- event_add (&session->ev, NULL);
-
- /* Plan new retransmit timer */
- ev_base = event_get_base (&session->timev);
- event_del (&session->timev);
- event_base_set (ev_base, &session->timev);
- event_add (&session->timev, &session->tv);
- session->retransmits ++;
- }
- }
-
- static GPtrArray *
- fuzzy_generate_commands (struct rspamd_task *task, struct fuzzy_rule *rule,
- gint c, gint flag, guint32 value)
- {
- struct rspamd_mime_text_part *part;
- struct rspamd_mime_part *mime_part;
- struct rspamd_image *image;
- struct fuzzy_cmd_io *io;
- guint i;
- GPtrArray *res;
-
- res = g_ptr_array_sized_new (task->parts->len + 1);
-
- if (c == FUZZY_STAT) {
- io = fuzzy_cmd_stat (rule, c, flag, value, task->task_pool);
- if (io) {
- g_ptr_array_add (res, io);
- }
-
- goto end;
- }
-
- for (i = 0; i < task->text_parts->len; i ++) {
- part = g_ptr_array_index (task->text_parts, i);
-
- if (IS_PART_EMPTY (part)) {
- continue;
- }
-
- /* Check length of part */
- if (fuzzy_module_ctx->min_bytes > part->content->len) {
- msg_info_task ("<%s>, part is shorter than %d bytes (%d bytes), "
- "skip fuzzy check",
- task->message_id, fuzzy_module_ctx->min_bytes,
- part->content->len);
- continue;
- }
-
- if (part->normalized_words == NULL || part->normalized_words->len == 0) {
- msg_info_task ("<%s>, part hash empty, skip fuzzy check",
- task->message_id);
- continue;
- }
-
- if (fuzzy_module_ctx->min_hash_len != 0 &&
- part->normalized_words->len < fuzzy_module_ctx->min_hash_len) {
- msg_info_task (
- "<%s>, part hash is shorter than %d symbols, skip fuzzy check",
- task->message_id,
- fuzzy_module_ctx->min_hash_len);
- continue;
- }
-
- io = fuzzy_cmd_from_text_part (rule, c, flag, value, task->task_pool,
- part);
- if (io) {
- g_ptr_array_add (res, io);
- }
- }
-
- /* Process other parts and images */
- for (i = 0; i < task->parts->len; i ++) {
- mime_part = g_ptr_array_index (task->parts, i);
-
- if (mime_part->flags & RSPAMD_MIME_PART_IMAGE) {
- image = mime_part->specific.img;
-
- if (image->data->len > 0) {
- if (fuzzy_module_ctx->min_height <= 0 || image->height >=
- fuzzy_module_ctx->min_height) {
- if (fuzzy_module_ctx->min_width <= 0 || image->width >=
- fuzzy_module_ctx->min_width) {
- io = fuzzy_cmd_from_data_part (rule, c, flag, value,
- task->task_pool,
- image->parent->digest);
- if (io) {
- g_ptr_array_add (res, io);
- }
-
- if (image->is_normalized) {
- io = fuzzy_cmd_from_image_part (rule, c, flag, value,
- task->task_pool,
- image);
- if (io) {
- g_ptr_array_add (res, io);
- }
- }
- }
- }
- }
- }
-
- if (mime_part->parsed_data.len > 0 &&
- fuzzy_check_content_type (rule, mime_part->ct)) {
- if (fuzzy_module_ctx->min_bytes <= 0 || mime_part->parsed_data.len >=
- fuzzy_module_ctx->min_bytes) {
- io = fuzzy_cmd_from_data_part (rule, c, flag, value,
- task->task_pool,
- mime_part->digest);
- if (io) {
- g_ptr_array_add (res, io);
- }
- }
- }
- }
-
- /* Process metadata */
- #if 0
- io = fuzzy_cmd_from_task_meta (rule, c, flag, value,
- task->task_pool, task);
- if (io) {
- g_ptr_array_add (res, io);
- }
- #endif
- end:
- if (res->len == 0) {
- g_ptr_array_free (res, FALSE);
- return NULL;
- }
-
- return res;
- }
-
-
- static inline void
- register_fuzzy_client_call (struct rspamd_task *task,
- struct fuzzy_rule *rule,
- GPtrArray *commands)
- {
- struct fuzzy_client_session *session;
- struct upstream *selected;
- rspamd_inet_addr_t *addr;
- gint sock;
-
- /* Get upstream */
- selected = rspamd_upstream_get (rule->servers, RSPAMD_UPSTREAM_ROUND_ROBIN,
- NULL, 0);
- if (selected) {
- addr = rspamd_upstream_addr (selected);
- if ((sock = rspamd_inet_address_connect (addr, SOCK_DGRAM, TRUE)) == -1) {
- msg_warn_task ("cannot connect to %s(%s), %d, %s",
- rspamd_upstream_name (selected),
- rspamd_inet_address_to_string (addr),
- errno,
- strerror (errno));
- rspamd_upstream_fail (selected);
- g_ptr_array_free (commands, TRUE);
- }
- else {
- /* Create session for a socket */
- session =
- rspamd_mempool_alloc0 (task->task_pool,
- sizeof (struct fuzzy_client_session));
- msec_to_tv (fuzzy_module_ctx->io_timeout, &session->tv);
- session->state = 0;
- session->commands = commands;
- session->task = task;
- session->fd = sock;
- session->server = selected;
- session->rule = rule;
- session->addr = addr;
-
- event_set (&session->ev, sock, EV_WRITE, fuzzy_check_io_callback,
- session);
- event_base_set (session->task->ev_base, &session->ev);
- event_add (&session->ev, NULL);
-
- evtimer_set (&session->timev, fuzzy_check_timer_callback,
- session);
- event_base_set (session->task->ev_base, &session->timev);
- event_add (&session->timev, &session->tv);
-
- rspamd_session_add_event (task->s,
- fuzzy_io_fin,
- session,
- g_quark_from_static_string ("fuzzy check"));
- }
- }
- }
-
- /* This callback is called when we check message in fuzzy hashes storage */
- static void
- fuzzy_symbol_callback (struct rspamd_task *task, void *unused)
- {
- struct fuzzy_rule *rule;
- guint i;
- GPtrArray *commands;
-
- if (!fuzzy_module_ctx->enabled) {
- return;
- }
-
- /* Check whitelist */
- if (fuzzy_module_ctx->whitelist) {
- if (radix_find_compressed_addr (fuzzy_module_ctx->whitelist,
- task->from_addr) != RADIX_NO_VALUE) {
- msg_info_task ("<%s>, address %s is whitelisted, skip fuzzy check",
- task->message_id,
- rspamd_inet_address_to_string (task->from_addr));
- return;
- }
- }
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- commands = fuzzy_generate_commands (task, rule, FUZZY_CHECK, 0, 0);
-
- if (commands != NULL) {
- register_fuzzy_client_call (task, rule, commands);
- }
- }
- }
-
- void
- fuzzy_stat_command (struct rspamd_task *task)
- {
- struct fuzzy_rule *rule;
- guint i;
- GPtrArray *commands;
-
- if (!fuzzy_module_ctx->enabled) {
- return;
- }
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- commands = fuzzy_generate_commands (task, rule, FUZZY_STAT, 0, 0);
- if (commands != NULL) {
- register_fuzzy_client_call (task, rule, commands);
- }
- }
- }
-
- static inline gint
- register_fuzzy_controller_call (struct rspamd_http_connection_entry *entry,
- struct fuzzy_rule *rule,
- struct rspamd_task *task,
- GPtrArray *commands,
- gint *saved,
- GError **err)
- {
- struct fuzzy_learn_session *s;
- struct upstream *selected;
- rspamd_inet_addr_t *addr;
- struct rspamd_controller_session *session = entry->ud;
- gint sock;
- gint ret = -1;
-
- /* Get upstream */
-
- while ((selected = rspamd_upstream_get (rule->servers,
- RSPAMD_UPSTREAM_SEQUENTIAL, NULL, 0))) {
- /* Create UDP socket */
- addr = rspamd_upstream_addr (selected);
-
- if ((sock = rspamd_inet_address_connect (addr,
- SOCK_DGRAM, TRUE)) == -1) {
- rspamd_upstream_fail (selected);
- }
- else {
- s =
- rspamd_mempool_alloc0 (session->pool,
- sizeof (struct fuzzy_learn_session));
-
- msec_to_tv (fuzzy_module_ctx->io_timeout, &s->tv);
- s->task = task;
- s->addr = addr;
- s->commands = commands;
- s->http_entry = entry;
- s->server = selected;
- s->saved = saved;
- s->fd = sock;
- s->err = err;
- s->rule = rule;
- /* We ref connection to avoid freeing before we process fuzzy rule */
- rspamd_http_connection_ref (entry->conn);
-
- event_set (&s->ev, sock, EV_WRITE, fuzzy_controller_io_callback, s);
- event_base_set (entry->rt->ev_base, &s->ev);
- event_add (&s->ev, NULL);
-
- evtimer_set (&s->timev, fuzzy_controller_timer_callback,
- s);
- event_base_set (s->task->ev_base, &s->timev);
- event_add (&s->timev, &s->tv);
-
- (*saved)++;
- ret = 1;
- }
- }
-
- return ret;
- }
-
- static void
- fuzzy_process_handler (struct rspamd_http_connection_entry *conn_ent,
- struct rspamd_http_message *msg, gint cmd, gint value, gint flag,
- struct fuzzy_ctx *ctx, gboolean is_hash)
- {
- struct fuzzy_rule *rule;
- struct rspamd_controller_session *session = conn_ent->ud;
- struct rspamd_task *task, **ptask;
- gboolean processed = FALSE, res = TRUE, skip;
- guint i;
- GError **err;
- GPtrArray *commands;
- GString *tb;
- lua_State *L;
- gint r, *saved, rules = 0, err_idx;
-
- /* Prepare task */
- task = rspamd_task_new (session->wrk, session->cfg);
- task->cfg = ctx->cfg;
- task->ev_base = conn_ent->rt->ev_base;
- saved = rspamd_mempool_alloc0 (session->pool, sizeof (gint));
- err = rspamd_mempool_alloc0 (session->pool, sizeof (GError *));
-
- if (!is_hash) {
- /* Allocate message from string */
- /* XXX: what about encrypted messsages ? */
- task->msg.begin = msg->body_buf.begin;
- task->msg.len = msg->body_buf.len;
-
- r = rspamd_message_parse (task);
-
- if (r == -1) {
- msg_warn_task ("<%s>: cannot process message for fuzzy",
- task->message_id);
- rspamd_task_free (task);
- rspamd_controller_send_error (conn_ent, 400,
- "Message processing error");
- return;
- }
- }
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- if (rule->read_only) {
- continue;
- }
-
- /* Check for flag */
- if (g_hash_table_lookup (rule->mappings,
- GINT_TO_POINTER (flag)) == NULL) {
- msg_info_task ("skip rule %s as it has no flag %d defined"
- " false", rule->name, flag);
- continue;
- }
-
- /* Check learn condition */
- if (rule->learn_condition_cb != -1) {
- skip = FALSE;
- L = session->cfg->lua_state;
- lua_pushcfunction (L, &rspamd_lua_traceback);
- err_idx = lua_gettop (L);
-
- lua_rawgeti (L, LUA_REGISTRYINDEX, rule->learn_condition_cb);
- ptask = lua_newuserdata (L, sizeof (struct rspamd_task *));
- *ptask = task;
- rspamd_lua_setclass (L, "rspamd{task}", -1);
-
- if (lua_pcall (L, 1, LUA_MULTRET, err_idx) != 0) {
- tb = lua_touserdata (L, -1);
- msg_err_task ("call to user extraction script failed: %v", tb);
- g_string_free (tb, TRUE);
- }
- else {
- if (lua_gettop (L) > 1) {
- skip = !(lua_toboolean (L, -2));
-
- if (lua_isnumber (L, -1)) {
- msg_info_task ("learn condition changed flag from %d to "
- "%d", flag, (guint)lua_tonumber (L, -1));
- flag = lua_tonumber (L, -1);
- }
- }
- else {
- skip = !(lua_toboolean (L, -1));
- }
- }
-
- /* Result + error function */
- lua_settop (L, 0);
-
- if (skip) {
- msg_info_task ("skip rule %s as its condition callback returned"
- " false", rule->name);
- continue;
- }
- }
-
- rules ++;
-
- res = 0;
-
- if (is_hash) {
- GPtrArray *args;
- const rspamd_ftok_t *arg;
- guint i;
-
- args = rspamd_http_message_find_header_multiple (msg, "Hash");
-
- if (args) {
- struct fuzzy_cmd_io *io;
- commands = g_ptr_array_sized_new (args->len);
-
- for (i = 0; i < args->len; i ++) {
- arg = g_ptr_array_index (args, i);
- io = fuzzy_cmd_hash (rule, cmd, arg, flag, value,
- task->task_pool);
-
- if (io) {
- g_ptr_array_add (commands, io);
- }
- }
-
- res = register_fuzzy_controller_call (conn_ent,
- rule,
- task,
- commands,
- saved,
- err);
- rspamd_mempool_add_destructor (task->task_pool,
- rspamd_ptr_array_free_hard, commands);
- g_ptr_array_free (args, TRUE);
- }
- else {
- rspamd_controller_send_error (conn_ent, 400,
- "No hash defined");
- rspamd_task_free (task);
- return;
- }
- }
- else {
- commands = fuzzy_generate_commands (task, rule, cmd, flag, value);
- if (commands != NULL) {
- res = register_fuzzy_controller_call (conn_ent,
- rule,
- task,
- commands,
- saved,
- err);
- rspamd_mempool_add_destructor (task->task_pool,
- rspamd_ptr_array_free_hard, commands);
- }
- }
-
-
- if (res) {
- processed = TRUE;
- }
- }
-
- if (res == -1) {
- msg_warn_task ("<%s>: cannot send fuzzy request: %s", task->message_id,
- strerror (errno));
- rspamd_controller_send_error (conn_ent, 400, "Message sending error");
- rspamd_task_free (task);
- return;
- }
- else if (!processed) {
- if (rules) {
- msg_warn_task ("<%s>: no content to generate fuzzy",
- task->message_id);
- rspamd_controller_send_error (conn_ent, 404,
- "No content to generate fuzzy for flag %d", flag);
- }
- else {
- msg_warn_task ("<%s>: no fuzzy rules found for flag %d",
- task->message_id,
- flag);
- rspamd_controller_send_error (conn_ent, 404,
- "No fuzzy rules matched for flag %d", flag);
- }
- rspamd_task_free (task);
-
- return;
- }
-
- return;
- }
-
- static int
- fuzzy_controller_handler (struct rspamd_http_connection_entry *conn_ent,
- struct rspamd_http_message *msg, struct module_ctx *ctx, gint cmd,
- gboolean is_hash)
- {
- const rspamd_ftok_t *arg;
- glong value = 1, flag = 0;
-
- if (!fuzzy_module_ctx->enabled) {
- msg_err ("fuzzy_check module is not enabled");
- rspamd_controller_send_error (conn_ent, 500, "Module disabled");
- return 0;
- }
-
- if (fuzzy_module_ctx->fuzzy_rules == NULL) {
- msg_err ("fuzzy_check module has no rules defined");
- rspamd_controller_send_error (conn_ent, 500, "Module has no rules");
- return 0;
- }
-
- /* Get size */
- arg = rspamd_http_message_find_header (msg, "Weight");
- if (arg) {
- errno = 0;
-
- if (!rspamd_strtol (arg->begin, arg->len, &value)) {
- msg_info ("error converting numeric argument %T", arg);
- }
- }
-
- arg = rspamd_http_message_find_header (msg, "Flag");
- if (arg) {
- errno = 0;
-
- if (!rspamd_strtol (arg->begin, arg->len, &flag)) {
- msg_info ("error converting numeric argument %T", arg);
- flag = 0;
- }
- }
- else {
- flag = 0;
- arg = rspamd_http_message_find_header (msg, "Symbol");
-
- /* Search flag by symbol */
- if (arg) {
- struct fuzzy_rule *rule;
- guint i;
- GHashTableIter it;
- gpointer k, v;
- struct fuzzy_mapping *map;
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- if (flag != 0) {
- break;
- }
-
- g_hash_table_iter_init (&it, rule->mappings);
-
- while (g_hash_table_iter_next (&it, &k, &v)) {
- map = v;
-
- if (strlen (map->symbol) == arg->len &&
- rspamd_lc_cmp (map->symbol, arg->begin, arg->len) == 0) {
- flag = map->fuzzy_flag;
- break;
- }
- }
- }
- }
- }
-
- if (flag == 0) {
- msg_err ("no flag defined to learn fuzzy");
- rspamd_controller_send_error (conn_ent, 404, "Unknown or missing flag");
- return 0;
- }
-
- fuzzy_process_handler (conn_ent, msg, cmd, value, flag,
- (struct fuzzy_ctx *)ctx, is_hash);
-
- return 0;
- }
-
- static inline gint
- fuzzy_check_send_lua_learn (struct fuzzy_rule *rule,
- struct rspamd_task *task,
- GPtrArray *commands,
- gint *saved,
- GError **err)
- {
- struct fuzzy_learn_session *s;
- struct upstream *selected;
- rspamd_inet_addr_t *addr;
- gint sock;
- gint ret = -1;
-
- /* Get upstream */
-
- while ((selected = rspamd_upstream_get (rule->servers,
- RSPAMD_UPSTREAM_SEQUENTIAL, NULL, 0))) {
- /* Create UDP socket */
- addr = rspamd_upstream_addr (selected);
-
- if ((sock = rspamd_inet_address_connect (addr,
- SOCK_DGRAM, TRUE)) == -1) {
- rspamd_upstream_fail (selected);
- }
- else {
- s =
- rspamd_mempool_alloc0 (task->task_pool,
- sizeof (struct fuzzy_learn_session));
-
- msec_to_tv (fuzzy_module_ctx->io_timeout, &s->tv);
- s->task = task;
- s->addr = addr;
- s->commands = commands;
- s->http_entry = NULL;
- s->server = selected;
- s->saved = saved;
- s->fd = sock;
- s->err = err;
- s->rule = rule;
- s->session = task->s;
-
- event_set (&s->ev, sock, EV_WRITE, fuzzy_controller_io_callback, s);
- event_base_set (task->ev_base, &s->ev);
- event_add (&s->ev, NULL);
-
- evtimer_set (&s->timev, fuzzy_controller_timer_callback, s);
- event_base_set (s->task->ev_base, &s->timev);
- event_add (&s->timev, &s->tv);
-
- rspamd_session_add_event (task->s,
- fuzzy_lua_fin,
- s,
- g_quark_from_static_string ("fuzzy check"));
-
- (*saved)++;
- ret = 1;
- }
- }
-
- return ret;
- }
-
- static gboolean
- fuzzy_check_lua_process_learn (struct rspamd_task *task,
- gint cmd, gint value, gint flag)
- {
- struct fuzzy_rule *rule;
- gboolean processed = FALSE, res = TRUE;
- guint i;
- GError **err;
- GPtrArray *commands;
- gint *saved, rules = 0;
-
- saved = rspamd_mempool_alloc0 (task->task_pool, sizeof (gint));
- err = rspamd_mempool_alloc0 (task->task_pool, sizeof (GError *));
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- if (!res) {
- break;
- }
- if (rule->read_only) {
- continue;
- }
-
- /* Check for flag */
- if (g_hash_table_lookup (rule->mappings,
- GINT_TO_POINTER (flag)) == NULL) {
- msg_info_task ("skip rule %s as it has no flag %d defined"
- " false", rule->name, flag);
- continue;
- }
-
- rules ++;
-
- res = 0;
- commands = fuzzy_generate_commands (task, rule, cmd, flag, value);
- if (commands != NULL) {
- res = fuzzy_check_send_lua_learn (rule, task, commands,
- saved, err);
- rspamd_mempool_add_destructor (task->task_pool,
- rspamd_ptr_array_free_hard, commands);
- }
-
- if (res) {
- processed = TRUE;
- }
- }
-
- if (res == -1) {
- msg_warn_task ("<%s>: cannot send fuzzy request: %s", task->message_id,
- strerror (errno));
- }
- else if (!processed) {
- if (rules) {
- msg_warn_task ("<%s>: no content to generate fuzzy",
- task->message_id);
-
- return FALSE;
- }
- else {
- msg_warn_task ("<%s>: no fuzzy rules found for flag %d",
- task->message_id,
- flag);
- return FALSE;
- }
- }
-
- return TRUE;
- }
-
- static gint
- fuzzy_lua_learn_handler (lua_State *L)
- {
- struct rspamd_task *task = lua_check_task (L, 1);
- guint flag = 0, weight = 1.0;
- const gchar *symbol;
-
-
- if (task) {
- if (lua_type (L, 2) == LUA_TNUMBER) {
- flag = lua_tonumber (L, 2);
- }
- else if (lua_type (L, 2) == LUA_TSTRING) {
- struct fuzzy_rule *rule;
- guint i;
- GHashTableIter it;
- gpointer k, v;
- struct fuzzy_mapping *map;
-
- symbol = lua_tostring (L, 2);
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
- if (flag != 0) {
- break;
- }
-
- g_hash_table_iter_init (&it, rule->mappings);
-
- while (g_hash_table_iter_next (&it, &k, &v)) {
- map = v;
-
- if (g_ascii_strcasecmp (symbol, map->symbol) == 0) {
- flag = map->fuzzy_flag;
- break;
- }
- }
- }
- }
-
- if (flag == 0) {
- return luaL_error (L, "bad flag");
- }
-
- if (lua_type (L, 3) == LUA_TNUMBER) {
- weight = lua_tonumber (L, 3);
- }
-
- lua_pushboolean (L,
- fuzzy_check_lua_process_learn (task, FUZZY_WRITE, weight, flag));
- }
- else {
- return luaL_error (L, "invalid arguments");
- }
-
- return 1;
- }
-
- static gint
- fuzzy_lua_unlearn_handler (lua_State *L)
- {
- struct rspamd_task *task = lua_check_task (L, 1);
- guint flag = 0, weight = 1.0;
- const gchar *symbol;
-
- if (task) {
- if (lua_type (L, 2) == LUA_TNUMBER) {
- flag = lua_tonumber (L, 1);
- }
- else if (lua_type (L, 2) == LUA_TSTRING) {
- struct fuzzy_rule *rule;
- guint i;
- GHashTableIter it;
- gpointer k, v;
- struct fuzzy_mapping *map;
-
- symbol = lua_tostring (L, 2);
-
- PTR_ARRAY_FOREACH (fuzzy_module_ctx->fuzzy_rules, i, rule) {
-
- if (flag != 0) {
- break;
- }
-
- g_hash_table_iter_init (&it, rule->mappings);
-
- while (g_hash_table_iter_next (&it, &k, &v)) {
- map = v;
-
- if (g_ascii_strcasecmp (symbol, map->symbol) == 0) {
- flag = map->fuzzy_flag;
- break;
- }
- }
- }
- }
-
- if (flag == 0) {
- return luaL_error (L, "bad flag");
- }
-
- if (lua_type (L, 3) == LUA_TNUMBER) {
- weight = lua_tonumber (L, 3);
- }
-
- lua_pushboolean (L,
- fuzzy_check_lua_process_learn (task, FUZZY_DEL, weight, flag));
- }
- else {
- return luaL_error (L, "invalid arguments");
- }
-
- return 1;
- }
-
- static gboolean
- fuzzy_add_handler (struct rspamd_http_connection_entry *conn_ent,
- struct rspamd_http_message *msg, struct module_ctx *ctx)
- {
- return fuzzy_controller_handler (conn_ent, msg,
- ctx, FUZZY_WRITE, FALSE);
- }
-
- static gboolean
- fuzzy_delete_handler (struct rspamd_http_connection_entry *conn_ent,
- struct rspamd_http_message *msg, struct module_ctx *ctx)
- {
- return fuzzy_controller_handler (conn_ent, msg,
- ctx, FUZZY_DEL, FALSE);
- }
-
- static gboolean
- fuzzy_deletehash_handler (struct rspamd_http_connection_entry *conn_ent,
- struct rspamd_http_message *msg, struct module_ctx *ctx)
- {
- return fuzzy_controller_handler (conn_ent, msg,
- ctx, FUZZY_DEL, TRUE);
- }
-
- static int
- fuzzy_attach_controller (struct module_ctx *ctx, GHashTable *commands)
- {
- struct fuzzy_ctx *fctx = (struct fuzzy_ctx *)ctx;
- struct rspamd_custom_controller_command *cmd;
-
- cmd = rspamd_mempool_alloc (fctx->fuzzy_pool, sizeof (*cmd));
- cmd->privilleged = TRUE;
- cmd->require_message = TRUE;
- cmd->handler = fuzzy_add_handler;
- cmd->ctx = ctx;
- g_hash_table_insert (commands, "/fuzzyadd", cmd);
-
- cmd = rspamd_mempool_alloc (fctx->fuzzy_pool, sizeof (*cmd));
- cmd->privilleged = TRUE;
- cmd->require_message = TRUE;
- cmd->handler = fuzzy_delete_handler;
- cmd->ctx = ctx;
- g_hash_table_insert (commands, "/fuzzydel", cmd);
-
- cmd = rspamd_mempool_alloc (fctx->fuzzy_pool, sizeof (*cmd));
- cmd->privilleged = TRUE;
- cmd->require_message = FALSE;
- cmd->handler = fuzzy_deletehash_handler;
- cmd->ctx = ctx;
- g_hash_table_insert (commands, "/fuzzydelhash", cmd);
-
- return 0;
- }
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