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/*
* Copyright (c) 2009, Rambler media
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY Rambler media ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Rambler BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/***MODULE:spf
* rspamd module that checks spf records of incoming email
*
* Allowed options:
* - symbol_allow (string): symbol to insert (default: 'R_SPF_ALLOW')
* - symbol_fail (string): symbol to insert (default: 'R_SPF_FAIL')
* - symbol_softfail (string): symbol to insert (default: 'R_SPF_SOFTFAIL')
* - whitelist (map): map of whitelisted networks
*/
#include "../config.h"
#include "../main.h"
#include "../message.h"
#include "../modules.h"
#include "../cfg_file.h"
#include "../expressions.h"
#include "../util.h"
#include "../view.h"
#include "../map.h"
#include "../spf.h"
#define DEFAULT_SYMBOL_FAIL "R_SPF_FAIL"
#define DEFAULT_SYMBOL_SOFTFAIL "R_SPF_SOFTFAIL"
#define DEFAULT_SYMBOL_ALLOW "R_SPF_ALLOW"
struct spf_ctx {
int (*filter) (struct worker_task * task);
char *symbol_fail;
char *symbol_softfail;
char *symbol_allow;
memory_pool_t *spf_pool;
radix_tree_t *whitelist_ip;
};
static struct spf_ctx *spf_module_ctx = NULL;
static void spf_symbol_callback (struct worker_task *task, void *unused);
int
spf_module_init (struct config_file *cfg, struct module_ctx **ctx)
{
spf_module_ctx = g_malloc (sizeof (struct spf_ctx));
spf_module_ctx->spf_pool = memory_pool_new (memory_pool_get_size ());
*ctx = (struct module_ctx *)spf_module_ctx;
return 0;
}
int
spf_module_config (struct config_file *cfg)
{
char *value;
int res = TRUE;
spf_module_ctx->whitelist_ip = radix_tree_create ();
if ((value = get_module_opt (cfg, "spf", "symbol_fail")) != NULL) {
spf_module_ctx->symbol_fail = memory_pool_strdup (spf_module_ctx->spf_pool, value);
}
else {
spf_module_ctx->symbol_fail = DEFAULT_SYMBOL_FAIL;
}
if ((value = get_module_opt (cfg, "spf", "symbol_softfail")) != NULL) {
spf_module_ctx->symbol_softfail = memory_pool_strdup (spf_module_ctx->spf_pool, value);
}
else {
spf_module_ctx->symbol_softfail = DEFAULT_SYMBOL_SOFTFAIL;
}
if ((value = get_module_opt (cfg, "spf", "symbol_allow")) != NULL) {
spf_module_ctx->symbol_allow = memory_pool_strdup (spf_module_ctx->spf_pool, value);
}
else {
spf_module_ctx->symbol_allow = DEFAULT_SYMBOL_ALLOW;
}
if ((value = get_module_opt (cfg, "spf", "whitelist")) != NULL) {
if (! add_map (value, read_radix_list, fin_radix_list, (void **)&spf_module_ctx->whitelist_ip)) {
msg_warn ("cannot load whitelist from %s", value);
}
}
register_symbol (&cfg->cache, spf_module_ctx->symbol_fail, 1, spf_symbol_callback, NULL);
return res;
}
int
spf_module_reconfig (struct config_file *cfg)
{
memory_pool_delete (spf_module_ctx->spf_pool);
radix_tree_free (spf_module_ctx->whitelist_ip);
spf_module_ctx->spf_pool = memory_pool_new (memory_pool_get_size ());
return spf_module_config (cfg);
}
static void
spf_plugin_callback (struct spf_record *record, struct worker_task *task)
{
GList *cur;
struct spf_addr *addr;
uint32_t s, m;
if (record) {
cur = g_list_first (record->addrs);
s = ntohl (task->from_addr.s_addr);
while (cur) {
addr = cur->data;
if (addr != NULL) {
if (addr->mask == 0) {
m = 0;
}
else {
m = G_MAXUINT32 << (32 - addr->mask);
}
if ((s & m) == (addr->addr & m)) {
switch (addr->mech) {
case SPF_FAIL:
insert_result (task, spf_module_ctx->symbol_fail, 1, g_list_prepend (NULL, addr->spf_string));
task->messages = g_list_prepend (task->messages, "(SPF): spf fail");
break;
case SPF_SOFT_FAIL:
case SPF_NEUTRAL:
insert_result (task, spf_module_ctx->symbol_softfail, 1, g_list_prepend (NULL, addr->spf_string));
task->messages = g_list_prepend (task->messages, "(SPF): spf softfail");
break;
default:
insert_result (task, spf_module_ctx->symbol_allow, 1, g_list_prepend (NULL, addr->spf_string));
task->messages = g_list_prepend (task->messages, "(SPF): spf allow");
break;
}
/* Stop parsing */
break;
}
}
cur = g_list_next (cur);
}
}
if (task->save.saved == 0) {
/* Call other filters */
task->save.saved = 1;
process_filters (task);
}
}
static void
spf_symbol_callback (struct worker_task *task, void *unused)
{
if (task->from_addr.s_addr != INADDR_NONE && task->from_addr.s_addr != INADDR_ANY) {
if (radix32tree_find (spf_module_ctx->whitelist_ip, ntohl (task->from_addr.s_addr)) == RADIX_NO_VALUE) {
if (!resolve_spf (task, spf_plugin_callback)) {
msg_info ("cannot make spf request for [%s]", task->message_id);
}
}
else {
msg_info ("ip %s is whitelisted for spf checks", inet_ntoa (task->from_addr));
}
}
}
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