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message.c
1444 lines (1209 loc) · 34.5 KB
/
message.c
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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.
*/
#include "config.h"
#include "util.h"
#include "rspamd.h"
#include "message.h"
#include "html.h"
#include "images.h"
#include "archives.h"
#include "tokenizers/tokenizers.h"
#include "smtp_parsers.h"
#include "mime_parser.h"
#include "mime_encoding.h"
#include "lang_detection.h"
#include "libutil/multipattern.h"
#include "libserver/mempool_vars_internal.h"
#ifdef WITH_SNOWBALL
#include "libstemmer.h"
#endif
#include <math.h>
#include <unicode/uchar.h>
#define GTUBE_SYMBOL "GTUBE"
#define SET_PART_RAW(part) ((part)->flags &= ~RSPAMD_MIME_TEXT_PART_FLAG_UTF)
#define SET_PART_UTF(part) ((part)->flags |= RSPAMD_MIME_TEXT_PART_FLAG_UTF)
static const gchar gtube_pattern_reject[] = "XJS*C4JDBQADN1.NSBN3*2IDNEN*"
"GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X";
static const gchar gtube_pattern_add_header[] = "YJS*C4JDBQADN1.NSBN3*2IDNEN*"
"GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X";
static const gchar gtube_pattern_rewrite_subject[] = "ZJS*C4JDBQADN1.NSBN3*2IDNEN*"
"GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X";
struct rspamd_multipattern *gtube_matcher = NULL;
static const guint64 words_hash_seed = 0xdeadbabe;
static void
free_byte_array_callback (void *pointer)
{
GByteArray *arr = (GByteArray *) pointer;
g_byte_array_free (arr, TRUE);
}
static void
rspamd_mime_part_extract_words (struct rspamd_task *task,
struct rspamd_mime_text_part *part)
{
rspamd_stat_token_t *w;
guint i, total_len = 0, short_len = 0;
if (part->utf_words) {
rspamd_stem_words (part->utf_words, task->task_pool, part->language,
task->lang_det);
for (i = 0; i < part->utf_words->len; i++) {
guint64 h;
w = &g_array_index (part->utf_words, rspamd_stat_token_t, i);
if (w->stemmed.len > 0) {
/*
* We use static hash seed if we would want to use that in shingles
* computation in future
*/
h = rspamd_cryptobox_fast_hash_specific (
RSPAMD_CRYPTOBOX_HASHFAST_INDEPENDENT,
w->stemmed.begin, w->stemmed.len, words_hash_seed);
g_array_append_val (part->normalized_hashes, h);
total_len += w->stemmed.len;
if (w->stemmed.len <= 3) {
short_len++;
}
}
if (w->flags & RSPAMD_STAT_TOKEN_FLAG_TEXT) {
part->nwords ++;
}
if (w->flags & (RSPAMD_STAT_TOKEN_FLAG_BROKEN_UNICODE|
RSPAMD_STAT_TOKEN_FLAG_NORMALISED|
RSPAMD_STAT_TOKEN_FLAG_INVISIBLE_SPACES)) {
task->flags |= RSPAMD_TASK_FLAG_BAD_UNICODE;
}
}
if (part->utf_words->len) {
gdouble *avg_len_p, *short_len_p;
avg_len_p = rspamd_mempool_get_variable (task->task_pool,
RSPAMD_MEMPOOL_AVG_WORDS_LEN);
if (avg_len_p == NULL) {
avg_len_p = rspamd_mempool_alloc (task->task_pool,
sizeof (double));
*avg_len_p = total_len;
rspamd_mempool_set_variable (task->task_pool,
RSPAMD_MEMPOOL_AVG_WORDS_LEN, avg_len_p, NULL);
}
else {
*avg_len_p += total_len;
}
short_len_p = rspamd_mempool_get_variable (task->task_pool,
RSPAMD_MEMPOOL_SHORT_WORDS_CNT);
if (short_len_p == NULL) {
short_len_p = rspamd_mempool_alloc (task->task_pool,
sizeof (double));
*short_len_p = short_len;
rspamd_mempool_set_variable (task->task_pool,
RSPAMD_MEMPOOL_SHORT_WORDS_CNT, avg_len_p, NULL);
}
else {
*short_len_p += short_len;
}
}
}
}
static void
rspamd_mime_part_create_words (struct rspamd_task *task,
struct rspamd_mime_text_part *part)
{
enum rspamd_tokenize_type tok_type;
if (IS_PART_UTF (part)) {
#if U_ICU_VERSION_MAJOR_NUM < 50
/* Hack to prevent hang with Thai in old libicu */
const gchar *p = part->utf_stripped_content->data, *end;
guint i = 0;
end = p + part->utf_stripped_content->len;
gint32 uc, sc;
tok_type = RSPAMD_TOKENIZE_UTF;
while (p + i < end) {
U8_NEXT (p, i, part->utf_stripped_content->len, uc);
if (((gint32) uc) < 0) {
tok_type = RSPAMD_TOKENIZE_RAW;
break;
}
if (u_isalpha (uc)) {
sc = ublock_getCode (uc);
if (sc == UBLOCK_THAI) {
msg_info_task ("enable workaround for Thai characters for old libicu");
tok_type = RSPAMD_TOKENIZE_RAW;
break;
}
}
}
#else
tok_type = RSPAMD_TOKENIZE_UTF;
#endif
}
else {
tok_type = RSPAMD_TOKENIZE_RAW;
}
part->utf_words = rspamd_tokenize_text (
part->utf_stripped_content->data,
part->utf_stripped_content->len,
&part->utf_stripped_text,
tok_type, task->cfg,
part->exceptions,
NULL, NULL);
if (part->utf_words) {
part->normalized_hashes = g_array_sized_new (FALSE, FALSE,
sizeof (guint64), part->utf_words->len);
rspamd_normalize_words (part->utf_words, task->task_pool);
}
}
static void
rspamd_mime_part_detect_language (struct rspamd_task *task,
struct rspamd_mime_text_part *part)
{
struct rspamd_lang_detector_res *lang;
if (!IS_PART_EMPTY (part) && part->utf_words && part->utf_words->len > 0 &&
task->lang_det) {
if (rspamd_language_detector_detect (task, task->lang_det, part)) {
lang = g_ptr_array_index (part->languages, 0);
part->language = lang->lang;
msg_info_task ("detected part language: %s", part->language);
}
else {
part->language = "en"; /* Safe fallback */
}
}
}
static void
rspamd_strip_newlines_parse (const gchar *begin, const gchar *pe,
struct rspamd_mime_text_part *part)
{
const gchar *p = begin, *c = begin;
gchar last_c = '\0';
gboolean crlf_added = FALSE;
gboolean url_open_bracket = FALSE;
enum {
normal_char,
seen_cr,
seen_lf,
} state = normal_char;
while (p < pe) {
if (G_UNLIKELY (*p) == '\r') {
switch (state) {
case normal_char:
state = seen_cr;
if (p > c) {
last_c = *(p - 1);
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)c, p - c);
}
crlf_added = FALSE;
c = p + 1;
break;
case seen_cr:
/* Double \r\r */
if (!crlf_added) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)" ", 1);
crlf_added = TRUE;
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
}
part->nlines ++;
part->empty_lines ++;
c = p + 1;
break;
case seen_lf:
/* Likely \r\n\r...*/
state = seen_cr;
c = p + 1;
break;
}
url_open_bracket = FALSE;
p ++;
}
else if (G_UNLIKELY (*p == '\n')) {
switch (state) {
case normal_char:
state = seen_lf;
if (p > c) {
last_c = *(p - 1);
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)c, p - c);
}
c = p + 1;
if (IS_PART_HTML (part) || !url_open_bracket) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)" ", 1);
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
crlf_added = TRUE;
}
else {
crlf_added = FALSE;
}
break;
case seen_cr:
/* \r\n */
if (!crlf_added) {
if (IS_PART_HTML (part) || !url_open_bracket) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *) " ", 1);
crlf_added = TRUE;
}
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
}
c = p + 1;
state = seen_lf;
break;
case seen_lf:
/* Double \n\n */
if (!crlf_added) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)" ", 1);
crlf_added = TRUE;
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
}
part->nlines++;
part->empty_lines ++;
c = p + 1;
break;
}
url_open_bracket = FALSE;
p ++;
}
else {
if ((*p) == '<') {
url_open_bracket = TRUE;
}
else if ((*p) == '>') {
url_open_bracket = FALSE;
}
switch (state) {
case normal_char:
if (G_UNLIKELY (*p) == ' ') {
part->spaces ++;
if (p > begin && *(p - 1) == ' ') {
part->double_spaces ++;
}
}
else {
part->non_spaces ++;
if (G_UNLIKELY (*p & 0x80)) {
part->non_ascii_chars ++;
}
else {
if (g_ascii_isupper (*p)) {
part->capital_letters ++;
}
else if (g_ascii_isdigit (*p)) {
part->numeric_characters ++;
}
part->ascii_chars ++;
}
}
break;
case seen_cr:
case seen_lf:
part->nlines ++;
if (!crlf_added) {
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
}
/* Skip initial spaces */
if (G_UNLIKELY (*p == ' ')) {
if (!crlf_added) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)" ", 1);
}
while (p < pe && *p == ' ') {
p ++;
c ++;
part->spaces ++;
}
if (p < pe && (*p == '\r' || *p == '\n')) {
part->empty_lines ++;
}
}
state = normal_char;
break;
}
p ++;
}
}
/* Leftover */
if (p > c) {
if (p > pe) {
p = pe;
}
switch (state) {
case normal_char:
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)c, p - c);
while (c < p) {
if (G_UNLIKELY (*c) == ' ') {
part->spaces ++;
if (*(c - 1) == ' ') {
part->double_spaces ++;
}
}
else {
part->non_spaces ++;
if (G_UNLIKELY (*c & 0x80)) {
part->non_ascii_chars ++;
}
else {
part->ascii_chars ++;
}
}
c ++;
}
break;
default:
if (!crlf_added) {
g_byte_array_append (part->utf_stripped_content,
(const guint8 *)" ", 1);
g_ptr_array_add (part->newlines,
(((gpointer) (goffset) (part->utf_stripped_content->len))));
}
part->nlines++;
break;
}
}
}
static void
rspamd_normalize_text_part (struct rspamd_task *task,
struct rspamd_mime_text_part *part)
{
const gchar *p, *end;
guint i;
goffset off;
struct rspamd_process_exception *ex;
UErrorCode uc_err = U_ZERO_ERROR;
part->newlines = g_ptr_array_sized_new (128);
if (IS_PART_EMPTY (part)) {
part->utf_stripped_content = g_byte_array_new ();
}
else {
part->utf_stripped_content = g_byte_array_sized_new (part->utf_content->len);
p = (const gchar *)part->utf_content->data;
end = p + part->utf_content->len;
rspamd_strip_newlines_parse (p, end, part);
for (i = 0; i < part->newlines->len; i ++) {
ex = rspamd_mempool_alloc (task->task_pool, sizeof (*ex));
off = (goffset)g_ptr_array_index (part->newlines, i);
g_ptr_array_index (part->newlines, i) = (gpointer)(goffset)
(part->utf_stripped_content->data + off);
ex->pos = off;
ex->len = 0;
ex->type = RSPAMD_EXCEPTION_NEWLINE;
part->exceptions = g_list_prepend (part->exceptions, ex);
}
}
if (IS_PART_UTF (part)) {
utext_openUTF8 (&part->utf_stripped_text,
part->utf_stripped_content->data,
part->utf_stripped_content->len,
&uc_err);
if (!U_SUCCESS (uc_err)) {
msg_warn_task ("cannot open text from utf content");
/* Probably, should be an assertion */
}
else {
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t)utext_close,
&part->utf_stripped_text);
}
}
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t) free_byte_array_callback,
part->utf_stripped_content);
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t) rspamd_ptr_array_free_hard,
part->newlines);
}
#define MIN3(a, b, c) ((a) < (b) ? ((a) < (c) ? (a) : (c)) : ((b) < (c) ? (b) : (c)))
static guint
rspamd_words_levenshtein_distance (struct rspamd_task *task,
GArray *w1, GArray *w2)
{
guint s1len, s2len, x, y, lastdiag, olddiag;
guint *column, ret;
guint64 h1, h2;
gint eq;
static const guint max_words = 8192;
s1len = w1->len;
s2len = w2->len;
if (s1len + s2len > max_words) {
msg_err_task ("cannot compare parts with more than %ud words: %ud",
max_words, s1len);
return 0;
}
column = g_malloc0 ((s1len + 1) * sizeof (guint));
for (y = 1; y <= s1len; y++) {
column[y] = y;
}
for (x = 1; x <= s2len; x++) {
column[0] = x;
for (y = 1, lastdiag = x - 1; y <= s1len; y++) {
olddiag = column[y];
h1 = g_array_index (w1, guint64, y - 1);
h2 = g_array_index (w2, guint64, x - 1);
eq = (h1 == h2) ? 1 : 0;
/*
* Cost of replacement is twice higher than cost of add/delete
* to calculate percentage properly
*/
column[y] = MIN3 (column[y] + 1, column[y - 1] + 1,
lastdiag + (eq * 2));
lastdiag = olddiag;
}
}
ret = column[s1len];
g_free (column);
return ret;
}
static gint
rspamd_multipattern_gtube_cb (struct rspamd_multipattern *mp,
guint strnum,
gint match_start,
gint match_pos,
const gchar *text,
gsize len,
void *context)
{
return strnum + 1; /* To distinguish from zero */
}
static enum rspamd_action_type
rspamd_check_gtube (struct rspamd_task *task, struct rspamd_mime_text_part *part)
{
static const gsize max_check_size = 8 * 1024;
gint ret;
enum rspamd_action_type act = METRIC_ACTION_NOACTION;
g_assert (part != NULL);
if (gtube_matcher == NULL) {
gtube_matcher = rspamd_multipattern_create (RSPAMD_MULTIPATTERN_DEFAULT);
rspamd_multipattern_add_pattern (gtube_matcher,
gtube_pattern_reject,
RSPAMD_MULTIPATTERN_DEFAULT);
rspamd_multipattern_add_pattern (gtube_matcher,
gtube_pattern_add_header,
RSPAMD_MULTIPATTERN_DEFAULT);
rspamd_multipattern_add_pattern (gtube_matcher,
gtube_pattern_rewrite_subject,
RSPAMD_MULTIPATTERN_DEFAULT);
g_assert (rspamd_multipattern_compile (gtube_matcher, NULL));
}
if (part->utf_content && part->utf_content->len >= sizeof (gtube_pattern_reject) &&
part->utf_content->len <= max_check_size) {
if ((ret = rspamd_multipattern_lookup (gtube_matcher, part->utf_content->data,
part->utf_content->len,
rspamd_multipattern_gtube_cb, NULL, NULL)) > 0) {
switch (ret) {
case 1:
act = METRIC_ACTION_REJECT;
break;
case 2:
act = METRIC_ACTION_ADD_HEADER;
break;
case 3:
act = METRIC_ACTION_REWRITE_SUBJECT;
break;
}
if (act != METRIC_ACTION_NOACTION) {
task->flags |= RSPAMD_TASK_FLAG_SKIP;
task->flags |= RSPAMD_TASK_FLAG_GTUBE;
msg_info_task (
"<%s>: gtube %s pattern has been found in part of length %ud",
task->message_id, rspamd_action_to_str (act),
part->utf_content->len);
}
}
}
return act;
}
static gint
exceptions_compare_func (gconstpointer a, gconstpointer b)
{
const struct rspamd_process_exception *ea = a, *eb = b;
return ea->pos - eb->pos;
}
static gboolean
rspamd_message_process_plain_text_part (struct rspamd_task *task,
struct rspamd_mime_text_part *text_part)
{
if (text_part->parsed.len == 0) {
text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_EMPTY;
return TRUE;
}
rspamd_mime_text_part_maybe_convert (task, text_part);
if (text_part->utf_raw_content != NULL) {
/* Different from HTML, where we also parse HTML and strip tags */
text_part->utf_content = text_part->utf_raw_content;
}
else {
/*
* We ignore unconverted parts from now as it is dangerous
* to treat them as text parts
*/
return FALSE;
}
return TRUE;
}
static gboolean
rspamd_message_process_html_text_part (struct rspamd_task *task,
struct rspamd_mime_text_part *text_part)
{
text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_HTML;
if (text_part->parsed.len == 0) {
text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_EMPTY;
return TRUE;
}
rspamd_mime_text_part_maybe_convert (task, text_part);
if (text_part->utf_raw_content == NULL) {
return FALSE;
}
text_part->html = rspamd_mempool_alloc0 (task->task_pool,
sizeof (*text_part->html));
text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_BALANCED;
text_part->utf_content = rspamd_html_process_part_full (
task->task_pool,
text_part->html,
text_part->utf_raw_content,
&text_part->exceptions,
task->urls,
task->emails);
if (text_part->utf_content->len == 0) {
text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_EMPTY;
}
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t) free_byte_array_callback,
text_part->utf_content);
return TRUE;
}
static gboolean
rspamd_message_process_text_part_maybe (struct rspamd_task *task,
struct rspamd_mime_part *mime_part)
{
struct rspamd_mime_text_part *text_part;
rspamd_ftok_t html_tok, xhtml_tok;
gboolean found_html = FALSE, found_txt = FALSE;
enum rspamd_action_type act;
if (IS_CT_TEXT (mime_part->ct)) {
html_tok.begin = "html";
html_tok.len = 4;
xhtml_tok.begin = "xhtml";
xhtml_tok.len = 5;
if (rspamd_ftok_cmp (&mime_part->ct->subtype, &html_tok) == 0 ||
rspamd_ftok_cmp (&mime_part->ct->subtype, &xhtml_tok) == 0) {
found_html = TRUE;
}
else {
/*
* We also need to apply heuristic for text parts that are actually
* HTML.
*/
RSPAMD_FTOK_ASSIGN (&html_tok, "<!DOCTYPE html");
RSPAMD_FTOK_ASSIGN (&xhtml_tok, "<html");
if (mime_part->parsed_data.len >= xhtml_tok.len &&
rspamd_lc_cmp (mime_part->parsed_data.begin,
xhtml_tok.begin, xhtml_tok.len) == 0) {
found_html = TRUE;
}
else if (mime_part->parsed_data.len >= html_tok.len &&
rspamd_lc_cmp (mime_part->parsed_data.begin,
html_tok.begin, html_tok.len) == 0) {
found_html = TRUE;
}
else {
/* We need to be extra careful with some stupid things here */
html_tok.begin = "plain";
html_tok.len = 5;
if (rspamd_ftok_cmp (&mime_part->ct->subtype, &html_tok) == 0) {
found_txt = TRUE;
}
else {
if (mime_part->cd && mime_part->cd->filename.len > 4) {
const gchar *pos = mime_part->cd->filename.begin +
mime_part->cd->filename.len -
sizeof (".txt") + 1;
if (rspamd_lc_cmp (pos, ".txt", sizeof ("txt") - 1) == 0) {
found_txt = TRUE;
}
else {
msg_debug_task ("found mime part with incorrect content-type: %T/%T, "
"filename: %T",
&mime_part->ct->type,
&mime_part->ct->subtype,
&mime_part->cd->filename);
}
}
else {
/* For something like Content-Type: text */
found_txt = TRUE;
}
}
}
if (found_html) {
msg_info_task ("found html part pretending to be text/plain part");
}
}
}
else {
/* Apply heuristic */
if (mime_part->cd && mime_part->cd->filename.len > 4) {
const gchar *pos = mime_part->cd->filename.begin +
mime_part->cd->filename.len - sizeof (".htm") + 1;
if (rspamd_lc_cmp (pos, ".htm", sizeof (".htm") - 1) == 0) {
found_html = TRUE;
}
else if (rspamd_lc_cmp (pos, ".txt", sizeof ("txt") - 1) == 0) {
found_txt = TRUE;
}
else if ( mime_part->cd->filename.len > 5) {
pos = mime_part->cd->filename.begin +
mime_part->cd->filename.len - sizeof (".html") + 1;
if (rspamd_lc_cmp (pos, ".html", sizeof (".html") - 1) == 0) {
found_html = TRUE;
}
}
}
if (found_txt || found_html) {
msg_info_task ("found %s part with incorrect content-type: %T/%T",
found_html ? "html" : "text",
&mime_part->ct->type, &mime_part->ct->subtype);
mime_part->ct->flags |= RSPAMD_CONTENT_TYPE_BROKEN;
}
}
/* Skip attachments */
if ((found_txt || found_html) &&
mime_part->cd && mime_part->cd->type == RSPAMD_CT_ATTACHMENT &&
(task->cfg && !task->cfg->check_text_attachements)) {
debug_task ("skip attachments for checking as text parts");
return TRUE;
}
else if (!(found_txt || found_html)) {
/* Not a text part */
return FALSE;
}
text_part = rspamd_mempool_alloc0 (task->task_pool,
sizeof (struct rspamd_mime_text_part));
text_part->mime_part = mime_part;
text_part->raw.begin = mime_part->raw_data.begin;
text_part->raw.len = mime_part->raw_data.len;
text_part->parsed.begin = mime_part->parsed_data.begin;
text_part->parsed.len = mime_part->parsed_data.len;
text_part->utf_stripped_text = (UText)UTEXT_INITIALIZER;
if (found_html) {
if (!rspamd_message_process_html_text_part (task, text_part)) {
return FALSE;
}
}
else {
if (!rspamd_message_process_plain_text_part (task, text_part)) {
return FALSE;
}
}
g_ptr_array_add (task->text_parts, text_part);
mime_part->flags |= RSPAMD_MIME_PART_TEXT;
mime_part->specific.txt = text_part;
act = rspamd_check_gtube (task, text_part);
if (act != METRIC_ACTION_NOACTION) {
struct rspamd_metric_result *mres = task->result;
gdouble score = NAN;
if (act == METRIC_ACTION_REJECT) {
score = rspamd_task_get_required_score (task, mres);
}
else {
score = mres->actions_limits[act];
}
rspamd_add_passthrough_result (task, act, RSPAMD_PASSTHROUGH_CRITICAL,
score, "Gtube pattern", "GTUBE");
if (ucl_object_lookup (task->messages, "smtp_message") == NULL) {
ucl_object_replace_key (task->messages,
ucl_object_fromstring ("Gtube pattern"), "smtp_message", 0,
false);
}
rspamd_task_insert_result (task, GTUBE_SYMBOL, 0, NULL);
return TRUE;
}
/* Post process part */
rspamd_normalize_text_part (task, text_part);
if (!IS_PART_HTML (text_part)) {
rspamd_url_text_extract (task->task_pool, task, text_part, FALSE);
}
if (text_part->exceptions) {
text_part->exceptions = g_list_sort (text_part->exceptions,
exceptions_compare_func);
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t)g_list_free,
text_part->exceptions);
}
rspamd_mime_part_create_words (task, text_part);
return TRUE;
}
/* Creates message from various data using libmagic to detect type */
static void
rspamd_message_from_data (struct rspamd_task *task, const guchar *start,
gsize len)
{
struct rspamd_content_type *ct = NULL;
struct rspamd_mime_part *part;
const char *mb = NULL;
gchar *mid;
rspamd_ftok_t srch, *tok;
g_assert (start != NULL);
part = rspamd_mempool_alloc0 (task->task_pool, sizeof (*part));
tok = rspamd_task_get_request_header (task, "Content-Type");
if (tok) {
/* We have Content-Type defined */
ct = rspamd_content_type_parse (tok->begin, tok->len,
task->task_pool);
part->ct = ct;
}
if (task->cfg && task->cfg->libs_ctx) {
mb = magic_buffer (task->cfg->libs_ctx->libmagic,
start,
len);
if (mb) {
srch.begin = mb;
srch.len = strlen (mb);
ct = rspamd_content_type_parse (srch.begin, srch.len,
task->task_pool);
msg_warn_task ("construct fake mime of type: %s", mb);
if (!part->ct) {
part->ct = ct;
}
part->detected_ct = ct;
}
}
part->raw_data.begin = start;
part->raw_data.len = len;
part->parsed_data.begin = start;
part->parsed_data.len = len;
/* Generate message ID */
mid = rspamd_mime_message_id_generate ("localhost.localdomain");
rspamd_mempool_add_destructor (task->task_pool,
(rspamd_mempool_destruct_t) g_free, mid);
task->message_id = mid;
task->queue_id = mid;
}
gboolean
rspamd_message_parse (struct rspamd_task *task)
{
struct received_header *recv, *trecv;
const gchar *p;
gsize len;
guint i;
GError *err = NULL;
rspamd_cryptobox_hash_state_t st;
guchar digest_out[rspamd_cryptobox_HASHBYTES];
if (RSPAMD_TASK_IS_EMPTY (task)) {
/* Don't do anything with empty task */
return TRUE;
}
p = task->msg.begin;
len = task->msg.len;
/* Skip any space characters to avoid some bad messages to be unparsed */
while (len > 0 && g_ascii_isspace (*p)) {
p ++;
len --;
}
/*
* Exim somehow uses mailbox format for messages being scanned:
* From xxx@xxx.com Fri May 13 19:08:48 2016
*
* So we check if a task has non-http format then we check for such a line
* at the beginning to avoid errors
*/
if (!(task->flags & RSPAMD_TASK_FLAG_JSON) || (task->flags &
RSPAMD_TASK_FLAG_LOCAL_CLIENT)) {
if (len > sizeof ("From ") - 1) {
if (memcmp (p, "From ", sizeof ("From ") - 1) == 0) {
/* Skip to CRLF */
msg_info_task ("mailbox input detected, enable workaround");
p += sizeof ("From ") - 1;
len -= sizeof ("From ") - 1;
while (len > 0 && *p != '\n') {
p ++;
len --;
}
while (len > 0 && g_ascii_isspace (*p)) {
p ++;
len --;
}
}
}
}