static void
dkim_sign_callback (struct rspamd_task *task, void *unused)
{
lua_State *L;
struct rspamd_task **ptask;
gboolean sign = FALSE;
gint err_idx;
GString *tb, *hdr;
GError *err = NULL;
const gchar *selector = NULL, *domain = NULL, *key = NULL;
rspamd_dkim_sign_context_t *ctx;
rspamd_dkim_sign_key_t *dkim_key;
if (dkim_module_ctx->sign_condition_ref != -1) {
sign = FALSE;
L = task->cfg->lua_state;
lua_pushcfunction (L, &rspamd_lua_traceback);
err_idx = lua_gettop (L);
lua_rawgeti (L, LUA_REGISTRYINDEX, dkim_module_ctx->sign_condition_ref);
ptask = lua_newuserdata (L, sizeof (struct rspamd_task *));
*ptask = task;
rspamd_lua_setclass (L, "rspamd{task}", -1);
if (lua_pcall (L, 1, 1, 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_istable (L, -1)) {
/*
* Get the following elements:
* - selector
* - domain
* - key
*/
if (!rspamd_lua_parse_table_arguments (L, -1, &err,
"*key=S;*domain=S;*selector=S",
&key, &domain, &selector)) {
msg_err_task ("invalid return value from sign condition: %e",
err);
g_error_free (err);
return;
}
dkim_key = rspamd_lru_hash_lookup (dkim_module_ctx->dkim_sign_hash,
key, time (NULL));
if (dkim_key == NULL) {
dkim_key = rspamd_dkim_sign_key_load (key, &err);
if (dkim_key == NULL) {
msg_err_task ("cannot load dkim key %s: %e",
key, err);
g_error_free (err);
return;
}
rspamd_lru_hash_insert (dkim_module_ctx->dkim_sign_hash,
g_strdup (key), dkim_key,
time (NULL), 0);
}
ctx = rspamd_create_dkim_sign_context (task, dkim_key,
DKIM_CANON_RELAXED, DKIM_CANON_RELAXED,
dkim_module_ctx->sign_headers, &err);
if (ctx == NULL) {
msg_err_task ("cannot create sign context: %e",
key, err);
g_error_free (err);
return;
}
hdr = rspamd_dkim_sign (task, selector, domain, 0, 0, ctx);
if (hdr) {
rspamd_mempool_set_variable (task->task_pool, "dkim-signature",
hdr, rspamd_gstring_free_hard);
}
sign = TRUE;
}
else {
sign = FALSE;
}
}
/* Result + error function */
lua_settop (L, 0);
if (!sign) {
msg_debug_task ("skip signing as dkim condition callback returned"
" false");
return;
}
}
}
static void
dkim_symbol_callback (struct rspamd_task *task, void *unused)
{
GList *hlist;
rspamd_dkim_context_t *ctx;
rspamd_dkim_key_t *key;
GError *err = NULL;
struct raw_header *rh;
struct dkim_check_result *res = NULL, *cur;
guint checked = 0;
/* First check if plugin should be enabled */
if (task->user != NULL || rspamd_inet_address_is_local (task->from_addr)) {
msg_info_task ("skip DKIM checks for local networks and authorized users");
return;
}
/* Check whitelist */
if (radix_find_compressed_addr (dkim_module_ctx->whitelist_ip,
task->from_addr) != RADIX_NO_VALUE) {
msg_info_task ("skip DKIM checks for whitelisted address");
return;
}
/* Now check if a message has its signature */
hlist = rspamd_message_get_header (task,
DKIM_SIGNHEADER,
FALSE);
if (hlist != NULL) {
msg_debug_task ("dkim signature found");
while (hlist != NULL) {
rh = (struct raw_header *)hlist->data;
if (rh->decoded == NULL || rh->decoded[0] == '\0') {
msg_info_task ("<%s> cannot load empty DKIM context",
task->message_id);
hlist = g_list_next (hlist);
continue;
}
if (res == NULL) {
res = rspamd_mempool_alloc0 (task->task_pool, sizeof (*res));
res->prev = res;
res->w = rspamd_session_get_watcher (task->s);
cur = res;
}
else {
cur = rspamd_mempool_alloc0 (task->task_pool, sizeof (*res));
}
cur->first = res;
cur->res = -1;
cur->task = task;
cur->mult_allow = 1.0;
cur->mult_deny = 1.0;
ctx = rspamd_create_dkim_context (rh->decoded,
task->task_pool,
dkim_module_ctx->time_jitter,
&err);
if (ctx == NULL) {
if (err != NULL) {
msg_info_task ("<%s> cannot parse DKIM context: %e",
task->message_id, err);
g_error_free (err);
err = NULL;
}
else {
msg_info_task ("<%s> cannot parse DKIM context: "
"unknown error",
task->message_id);
}
hlist = g_list_next (hlist);
continue;
}
else {
/* Get key */
cur->ctx = ctx;
if (dkim_module_ctx->trusted_only &&
(dkim_module_ctx->dkim_domains == NULL ||
g_hash_table_lookup (dkim_module_ctx->dkim_domains,
rspamd_dkim_get_domain (ctx)) == NULL)) {
msg_debug_task ("skip dkim check for %s domain",
rspamd_dkim_get_domain (ctx));
hlist = g_list_next (hlist);
continue;
}
key = rspamd_lru_hash_lookup (dkim_module_ctx->dkim_hash,
rspamd_dkim_get_dns_key (ctx),
task->tv.tv_sec);
if (key != NULL) {
cur->key = rspamd_dkim_key_ref (key);
/* Release key when task is processed */
rspamd_mempool_add_destructor (task->task_pool,
dkim_module_key_dtor, cur->key);
}
else {
rspamd_get_dkim_key (ctx,
task,
dkim_module_key_handler,
cur);
}
}
if (res != cur) {
DL_APPEND (res, cur);
}
if (dkim_module_ctx->skip_multi) {
if (hlist->next) {
msg_info_task ("message has multiple signatures but we"
" check only one as 'skip_multi' is set");
}
break;
}
checked ++;
if (checked > dkim_module_ctx->max_sigs) {
msg_info_task ("message has multiple signatures but we"
" stopped after %d checked signatures as limit"
" is reached", checked);
break;
}
hlist = g_list_next (hlist);
}
}
else {
rspamd_task_insert_result (task,
dkim_module_ctx->symbol_na,
1.0,
NULL);
}
if (res != NULL) {
rspamd_session_watcher_push (task->s);
dkim_module_check (res);
}
}
gint
lua_dkim_sign_handler (lua_State *L)
{
struct rspamd_task *task = lua_check_task (L, 1);
luaL_argcheck (L, lua_type (L, 2) == LUA_TTABLE, 2, "'table' expected");
GError *err = NULL;
GString *hdr;
const gchar *selector = NULL, *domain = NULL, *key = NULL;
rspamd_dkim_sign_context_t *ctx;
rspamd_dkim_sign_key_t *dkim_key;
/*
* Get the following elements:
* - selector
* - domain
* - key
*/
if (!rspamd_lua_parse_table_arguments (L, 2, &err,
"*key=S;*domain=S;*selector=S",
&key, &domain, &selector)) {
msg_err_task ("invalid return value from sign condition: %e",
err);
g_error_free (err);
lua_pushboolean (L, FALSE);
return 1;
}
if (dkim_module_ctx->dkim_sign_hash == NULL) {
dkim_module_ctx->dkim_sign_hash = rspamd_lru_hash_new (
128,
g_free, /* Keys are just C-strings */
(GDestroyNotify)rspamd_dkim_sign_key_unref);
}
dkim_key = rspamd_lru_hash_lookup (dkim_module_ctx->dkim_sign_hash,
key, time (NULL));
if (dkim_key == NULL) {
dkim_key = rspamd_dkim_sign_key_load (key, &err);
if (dkim_key == NULL) {
msg_err_task ("cannot load dkim key %s: %e",
key, err);
g_error_free (err);
lua_pushboolean (L, FALSE);
return 1;
}
rspamd_lru_hash_insert (dkim_module_ctx->dkim_sign_hash,
g_strdup (key), dkim_key,
time (NULL), 0);
}
ctx = rspamd_create_dkim_sign_context (task, dkim_key,
DKIM_CANON_RELAXED, DKIM_CANON_RELAXED,
dkim_module_ctx->sign_headers, &err);
if (ctx == NULL) {
msg_err_task ("cannot create sign context: %e",
err);
g_error_free (err);
lua_pushboolean (L, FALSE);
return 1;
}
hdr = rspamd_dkim_sign (task, selector, domain, 0, 0, ctx);
if (hdr) {
rspamd_mempool_set_variable (task->task_pool, "dkim-signature",
hdr, rspamd_gstring_free_hard);
lua_pushboolean (L, TRUE);
return 1;
}
lua_pushboolean (L, FALSE);
return 1;
}
static void
dkim_symbol_callback (struct rspamd_task *task, void *unused)
{
GList *hlist;
rspamd_dkim_context_t *ctx;
rspamd_dkim_key_t *key;
GError *err = NULL;
struct raw_header *rh;
struct dkim_check_result *res = NULL, *cur;
/* First check if a message has its signature */
hlist = rspamd_message_get_header (task,
DKIM_SIGNHEADER,
FALSE);
if (hlist != NULL) {
/* Check whitelist */
msg_debug ("dkim signature found");
if (radix_find_compressed_addr (dkim_module_ctx->whitelist_ip,
task->from_addr) == RADIX_NO_VALUE) {
/* Parse signature */
msg_debug ("create dkim signature");
while (hlist != NULL) {
rh = (struct raw_header *)hlist->data;
if (res == NULL) {
res = rspamd_mempool_alloc0 (task->task_pool, sizeof (*res));
res->prev = res;
res->w = rspamd_session_get_watcher (task->s);
cur = res;
}
else {
cur = rspamd_mempool_alloc0 (task->task_pool, sizeof (*res));
}
cur->first = res;
cur->res = -1;
cur->task = task;
cur->mult_allow = 1.0;
cur->mult_deny = 1.0;
ctx = rspamd_create_dkim_context (rh->decoded,
task->task_pool,
dkim_module_ctx->time_jitter,
&err);
if (ctx == NULL) {
if (err != NULL) {
msg_info ("<%s> cannot parse DKIM context: %s",
task->message_id, err->message);
g_error_free (err);
}
else {
msg_info ("<%s> cannot parse DKIM context: unknown error",
task->message_id);
}
hlist = g_list_next (hlist);
continue;
}
else {
/* Get key */
cur->ctx = ctx;
if (dkim_module_ctx->trusted_only &&
(dkim_module_ctx->dkim_domains == NULL ||
g_hash_table_lookup (dkim_module_ctx->dkim_domains,
ctx->domain) == NULL)) {
msg_debug ("skip dkim check for %s domain", ctx->domain);
hlist = g_list_next (hlist);
continue;
}
key = rspamd_lru_hash_lookup (dkim_module_ctx->dkim_hash,
ctx->dns_key,
task->tv.tv_sec);
if (key != NULL) {
debug_task ("found key for %s in cache", ctx->dns_key);
cur->key = key;
}
else {
debug_task ("request key for %s from DNS", ctx->dns_key);
rspamd_get_dkim_key (ctx,
task,
dkim_module_key_handler,
cur);
}
}
if (res != cur) {
DL_APPEND (res, cur);
}
hlist = g_list_next (hlist);
}
}
}
if (res != NULL) {
rspamd_session_watcher_push (task->s);
dkim_module_check (res);
}
}
static void
dkim_symbol_callback (struct rspamd_task *task, void *unused)
{
GList *hlist;
rspamd_dkim_context_t *ctx;
rspamd_dkim_key_t *key;
GError *err = NULL;
struct raw_header *rh;
/* First check if a message has its signature */
hlist = message_get_header (task,
DKIM_SIGNHEADER,
FALSE);
if (hlist != NULL) {
/* Check whitelist */
msg_debug ("dkim signature found");
if (radix_find_compressed_addr (dkim_module_ctx->whitelist_ip,
&task->from_addr) == RADIX_NO_VALUE) {
/* Parse signature */
msg_debug ("create dkim signature");
/*
* Check only last signature as there is no way to check embeded signatures after
* resend or something like this
*/
if (dkim_module_ctx->skip_multi) {
if (hlist->next != NULL) {
msg_info (
"<%s> skip dkim check as it has several dkim signatures",
task->message_id);
return;
}
}
hlist = g_list_last (hlist);
rh = (struct raw_header *)hlist->data;
ctx = rspamd_create_dkim_context (rh->decoded,
task->task_pool,
dkim_module_ctx->time_jitter,
&err);
if (ctx == NULL) {
msg_info ("cannot parse DKIM context: %s", err->message);
g_error_free (err);
}
else {
/* Get key */
if (dkim_module_ctx->trusted_only &&
(dkim_module_ctx->dkim_domains == NULL ||
g_hash_table_lookup (dkim_module_ctx->dkim_domains,
ctx->domain) == NULL)) {
msg_debug ("skip dkim check for %s domain", ctx->domain);
return;
}
key = rspamd_lru_hash_lookup (dkim_module_ctx->dkim_hash,
ctx->dns_key,
task->tv.tv_sec);
if (key != NULL) {
debug_task ("found key for %s in cache", ctx->dns_key);
dkim_module_check (task, ctx, key);
}
else {
debug_task ("request key for %s from DNS", ctx->dns_key);
task->dns_requests++;
rspamd_get_dkim_key (ctx,
task->resolver,
task->s,
dkim_module_key_handler,
task);
}
}
}
}
}
