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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:email
* rspamd module that extracts emails from messages and check them via blacklist
*/
#include "../config.h"
#include "../main.h"
#include "../message.h"
#include "../modules.h"
#include "../cfg_file.h"
#include "../expressions.h"
#include "../util.h"
#define DEFAULT_SYMBOL "R_BAD_EMAIL"
static const char *email_re_text = "[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+(?:[A-Z]{2}|com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum)\\b";
struct email_ctx {
int (*header_filter)(struct worker_task *task);
int (*mime_filter)(struct worker_task *task);
int (*message_filter)(struct worker_task *task);
int (*url_filter)(struct worker_task *task);
char *metric;
char *symbol;
GRegex *email_re;
GHashTable *blacklist;
char *blacklist_file;
memory_pool_t *email_pool;
};
static struct email_ctx *email_module_ctx = NULL;
static int emails_mime_filter (struct worker_task *task);
static int emails_command_handler (struct worker_task *task);
int
emails_module_init (struct config_file *cfg, struct module_ctx **ctx)
{
GError *err = NULL;
email_module_ctx = g_malloc (sizeof (struct email_ctx));
email_module_ctx->header_filter = NULL;
email_module_ctx->mime_filter = emails_mime_filter;
email_module_ctx->message_filter = NULL;
email_module_ctx->url_filter = NULL;
email_module_ctx->email_pool = memory_pool_new (memory_pool_get_size ());
email_module_ctx->email_re = g_regex_new (email_re_text, G_REGEX_RAW | G_REGEX_OPTIMIZE | G_REGEX_CASELESS, 0, &err);
email_module_ctx->blacklist = g_hash_table_new (g_str_hash, g_str_equal);
*ctx = (struct module_ctx *)email_module_ctx;
register_protocol_command ("emails", emails_command_handler);
return 0;
}
int
emails_module_config (struct config_file *cfg)
{
char *value;
int res = TRUE;
if ((value = get_module_opt (cfg, "emails", "metric")) != NULL) {
email_module_ctx->metric = memory_pool_strdup (email_module_ctx->email_pool, value);
g_free (value);
}
else {
email_module_ctx->metric = DEFAULT_METRIC;
}
if ((value = get_module_opt (cfg, "emails", "symbol")) != NULL) {
email_module_ctx->symbol = memory_pool_strdup (email_module_ctx->email_pool, value);
g_free (value);
}
else {
email_module_ctx->symbol = DEFAULT_SYMBOL;
}
if ((value = get_module_opt (cfg, "emails", "blacklist")) != NULL) {
if (g_ascii_strncasecmp (value, "file://", sizeof ("file://") - 1) == 0) {
if (parse_host_list (email_module_ctx->email_pool, email_module_ctx->blacklist, value + sizeof ("file://") - 1)) {
email_module_ctx->blacklist_file = memory_pool_strdup (email_module_ctx->email_pool, value + sizeof ("file://") - 1);
}
}
}
return res;
}
int
emails_module_reconfig (struct config_file *cfg)
{
memory_pool_delete (email_module_ctx->email_pool);
email_module_ctx->email_pool = memory_pool_new (memory_pool_get_size ());
return emails_module_config (cfg);
}
static GList *
extract_emails (struct worker_task *task)
{
GList *res = NULL, *cur;
GMatchInfo *info;
GError *err = NULL;
struct mime_text_part *part;
char *email_str;
int rc;
cur = g_list_first (task->text_parts);
while (cur) {
part = cur->data;
rc = g_regex_match_full (email_module_ctx->email_re, (const char *)part->orig->data, part->orig->len, 0, 0, &info, &err);
if (rc) {
while (g_match_info_matches (info)) {
email_str = g_match_info_fetch (info, 0);
if (email_str != NULL) {
res = g_list_prepend (res, email_str);
memory_pool_add_destructor (task->task_pool, (pool_destruct_func)g_free, email_str);
}
/* Get next match */
g_match_info_next (info, &err);
}
}
else if (err != NULL) {
msg_debug ("extract_emails: error matching regexp: %s", err->message);
}
else {
msg_debug ("extract_emails: cannot find url pattern in given string");
}
g_match_info_free (info);
cur = g_list_next (cur);
}
if (res != NULL) {
memory_pool_add_destructor (task->task_pool, (pool_destruct_func)g_list_free, res);
}
return res;
}
static int
emails_command_handler (struct worker_task *task)
{
GList *emails, *cur;
char outbuf[BUFSIZ];
int r, num = 0;
emails = extract_emails (task);
r = snprintf (outbuf, sizeof (outbuf), "%s 0 %s" CRLF, (task->proto == SPAMC_PROTO) ? SPAMD_REPLY_BANNER : RSPAMD_REPLY_BANNER, "OK");
r += snprintf (outbuf + r, sizeof (outbuf) - r - 2, "Emails: ");
cur = g_list_first (emails);
while (cur) {
num ++;
if (g_list_next (cur) != NULL) {
r += snprintf (outbuf + r, sizeof (outbuf) - r - 2, "%s, ", (char *)cur->data);
}
else {
r += snprintf (outbuf + r, sizeof (outbuf) - r - 2, "%s", (char *)cur->data);
}
cur = g_list_next (cur);
}
outbuf[r++] = '\r'; outbuf[r++] = '\n';
rspamd_dispatcher_write (task->dispatcher, outbuf, r, FALSE);
msg_info ("process_message: msg ok, id: <%s>, %d emails extracted", task->message_id, num);
return 0;
}
static int
emails_mime_filter (struct worker_task *task)
{
GList *emails, *cur;
emails = extract_emails (task);
if (email_module_ctx->blacklist && emails) {
cur = g_list_first (emails);
while (cur) {
if (g_hash_table_lookup (email_module_ctx->blacklist, cur->data) != NULL) {
insert_result (task, email_module_ctx->metric, email_module_ctx->symbol, 1,
g_list_prepend (NULL, memory_pool_strdup (task->task_pool, (char *)cur->data)));
}
cur = g_list_next (cur);
}
}
return 0;
}
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