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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 "libutil/mem_pool.h"
- #include "libutil/regexp.h"
- #include "libutil/hash.h"
- #include "libserver/task.h"
- #include "mime_encoding.h"
- #include "message.h"
- #include <unicode/ucnv.h>
- #include <unicode/ucsdet.h>
- #if U_ICU_VERSION_MAJOR_NUM >= 44
- #include <unicode/unorm2.h>
- #endif
- #include <math.h>
-
- #define UTF8_CHARSET "UTF-8"
-
- #define RSPAMD_CHARSET_FLAG_UTF (1 << 0)
- #define RSPAMD_CHARSET_FLAG_ASCII (1 << 1)
-
- #define RSPAMD_CHARSET_CACHE_SIZE 32
- #define RSPAMD_CHARSET_MAX_CONTENT 128
-
- #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 rspamd_regexp_t *utf_compatible_re = NULL;
-
- struct rspamd_charset_substitution {
- const gchar *input;
- const gchar *canon;
- gint flags;
- };
-
- #include "mime_encoding_list.h"
-
- static GHashTable *sub_hash = NULL;
-
- static const UChar iso_8859_16_map[] = {
- 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
- 0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
- 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
- 0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
- 0x00A0, 0x0104, 0x0105, 0x0141, 0x20AC, 0x201E, 0x0160, 0x00A7,
- 0x0161, 0x00A9, 0x0218, 0x00AB, 0x0179, 0x00AD, 0x017A, 0x017B,
- 0x00B0, 0x00B1, 0x010C, 0x0142, 0x017D, 0x201D, 0x00B6, 0x00B7,
- 0x017E, 0x010D, 0x0219, 0x00BB, 0x0152, 0x0153, 0x0178, 0x017C,
- 0x00C0, 0x00C1, 0x00C2, 0x0102, 0x00C4, 0x0106, 0x00C6, 0x00C7,
- 0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
- 0x0110, 0x0143, 0x00D2, 0x00D3, 0x00D4, 0x0150, 0x00D6, 0x015A,
- 0x0170, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x0118, 0x021A, 0x00DF,
- 0x00E0, 0x00E1, 0x00E2, 0x0103, 0x00E4, 0x0107, 0x00E6, 0x00E7,
- 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
- 0x0111, 0x0144, 0x00F2, 0x00F3, 0x00F4, 0x0151, 0x00F6, 0x015B,
- 0x0171, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x0119, 0x021B, 0x00FF
- };
-
- struct rspamd_charset_converter {
- gchar *canon_name;
- union {
- UConverter *conv;
- const UChar *cnv_table;
- } d;
- gboolean is_internal;
- };
-
- static GQuark
- rspamd_iconv_error_quark (void)
- {
- return g_quark_from_static_string ("iconv error");
- }
-
- static void
- rspamd_converter_dtor (gpointer p)
- {
- struct rspamd_charset_converter *c = (struct rspamd_charset_converter *)p;
-
- if (!c->is_internal) {
- ucnv_close (c->d.conv);
- }
-
- g_free (c->canon_name);
- g_free (c);
- }
-
- int32_t
- rspamd_converter_to_uchars (struct rspamd_charset_converter *cnv,
- UChar *dest,
- int32_t destCapacity,
- const char *src,
- int32_t srcLength,
- UErrorCode *pErrorCode)
- {
- if (!cnv->is_internal) {
- return ucnv_toUChars (cnv->d.conv,
- dest, destCapacity,
- src, srcLength,
- pErrorCode);
- }
- else {
- UChar *d = dest, *dend = dest + destCapacity;
- const guchar *p = src, *end = src + srcLength;
-
- while (p < end && d < dend) {
- if (*p <= 127) {
- *d++ = (UChar)*p;
- }
- else {
- *d++ = cnv->d.cnv_table[*p - 128];
- }
-
- p ++;
- }
-
- return d - dest;
- }
- }
-
-
- struct rspamd_charset_converter *
- rspamd_mime_get_converter_cached (const gchar *enc, UErrorCode *err)
- {
- const gchar *canon_name;
- static rspamd_lru_hash_t *cache;
- struct rspamd_charset_converter *conv;
-
- if (cache == NULL) {
- cache = rspamd_lru_hash_new_full (RSPAMD_CHARSET_CACHE_SIZE, NULL,
- rspamd_converter_dtor, rspamd_str_hash,
- rspamd_str_equal);
- }
-
- canon_name = ucnv_getStandardName (enc, "IANA", err);
-
- if (canon_name == NULL) {
- return NULL;
- }
-
- conv = rspamd_lru_hash_lookup (cache, (gpointer)canon_name, 0);
-
- if (conv == NULL) {
- if (!(strcmp (canon_name, "ISO-8859-16") == 0 ||
- strcmp (canon_name, "latin10") == 0 ||
- strcmp (canon_name, "iso-ir-226") == 0)) {
- conv = g_malloc0 (sizeof (*conv));
- conv->d.conv = ucnv_open (canon_name, err);
- conv->canon_name = g_strdup (canon_name);
-
- if (conv->d.conv != NULL) {
- ucnv_setToUCallBack (conv->d.conv,
- UCNV_TO_U_CALLBACK_SUBSTITUTE,
- NULL,
- NULL,
- NULL,
- err);
- rspamd_lru_hash_insert (cache, conv->canon_name, conv, 0, 0);
- }
- else {
- g_free (conv);
- conv = NULL;
- }
- }
- else {
- /* ISO-8859-16 */
- conv = g_malloc0 (sizeof (*conv));
- conv->is_internal = TRUE;
- conv->d.cnv_table = iso_8859_16_map;
- conv->canon_name = g_strdup (canon_name);
-
- rspamd_lru_hash_insert (cache, conv->canon_name, conv, 0, 0);
- }
- }
-
- return conv;
- }
-
- static void
- rspamd_mime_encoding_substitute_init (void)
- {
- guint i;
-
- sub_hash = g_hash_table_new (rspamd_strcase_hash, rspamd_strcase_equal);
-
- for (i = 0; i < G_N_ELEMENTS (sub); i ++) {
- g_hash_table_insert (sub_hash, (void *)sub[i].input, (void *)&sub[i]);
- }
- }
-
- static void
- rspamd_charset_normalize (gchar *in)
- {
- /*
- * This is a simple routine to validate input charset
- * we just check that charset starts with alphanumeric and ends
- * with alphanumeric
- */
- gchar *begin, *end;
- gboolean changed = FALSE;
-
- begin = in;
-
- while (*begin && !g_ascii_isalnum (*begin)) {
- begin ++;
- changed = TRUE;
- }
-
- end = begin + strlen (begin) - 1;
-
- while (end > begin && !g_ascii_isalnum (*end)) {
- end --;
- changed = TRUE;
- }
-
- if (changed) {
- memmove (in, begin, end - begin + 2);
- *(end + 1) = '\0';
- }
- }
-
- const gchar *
- rspamd_mime_detect_charset (const rspamd_ftok_t *in, rspamd_mempool_t *pool)
- {
- gchar *ret = NULL, *h, *t;
- struct rspamd_charset_substitution *s;
- UErrorCode uc_err = U_ZERO_ERROR;
-
- if (sub_hash == NULL) {
- rspamd_mime_encoding_substitute_init ();
- }
-
- ret = rspamd_mempool_ftokdup (pool, in);
- rspamd_charset_normalize (ret);
-
- if ((in->len > 3 && rspamd_lc_cmp (in->begin, "cp-", 3) == 0) ||
- (in->len > 4 && (rspamd_lc_cmp (in->begin, "ibm-", 4) == 0))) {
- /* Try to remove '-' chars from encoding: e.g. CP-100 to CP100 */
- h = ret;
- t = ret;
-
- while (*h != '\0') {
- if (*h != '-') {
- *t++ = *h;
- }
-
- h ++;
- }
-
- *t = '\0';
- }
-
- s = g_hash_table_lookup (sub_hash, ret);
-
- if (s) {
- return ucnv_getStandardName (s->canon, "IANA", &uc_err);
- }
-
- return ucnv_getStandardName (ret, "IANA", &uc_err);
- }
-
- gchar *
- rspamd_mime_text_to_utf8 (rspamd_mempool_t *pool,
- gchar *input, gsize len, const gchar *in_enc,
- gsize *olen, GError **err)
- {
- gchar *d;
- gint32 r, clen, dlen;
- UChar *tmp_buf;
-
- UErrorCode uc_err = U_ZERO_ERROR;
- UConverter *utf8_converter;
- struct rspamd_charset_converter *conv;
-
- conv = rspamd_mime_get_converter_cached (in_enc, &uc_err);
- utf8_converter = rspamd_get_utf8_converter ();
-
- if (conv == NULL) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot open converter for %s: %s",
- in_enc, u_errorName (uc_err));
-
- return NULL;
- }
-
- tmp_buf = g_new (UChar, len + 1);
- uc_err = U_ZERO_ERROR;
- r = rspamd_converter_to_uchars (conv, tmp_buf, len + 1, input, len, &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot convert data to unicode from %s: %s",
- in_enc, u_errorName (uc_err));
- g_free (tmp_buf);
-
- return NULL;
- }
-
- /* Now, convert to utf8 */
- clen = ucnv_getMaxCharSize (utf8_converter);
- dlen = UCNV_GET_MAX_BYTES_FOR_STRING (r, clen);
- d = rspamd_mempool_alloc (pool, dlen);
- r = ucnv_fromUChars (utf8_converter, d, dlen, tmp_buf, r, &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot convert data from unicode from %s: %s",
- in_enc, u_errorName (uc_err));
- g_free (tmp_buf);
-
- return NULL;
- }
-
- msg_info_pool ("converted from %s to UTF-8 inlen: %z, outlen: %d",
- in_enc, len, r);
- g_free (tmp_buf);
-
- if (olen) {
- *olen = r;
- }
-
- return d;
- }
-
- static gboolean
- rspamd_mime_text_part_utf8_convert (struct rspamd_task *task,
- struct rspamd_mime_text_part *text_part,
- GByteArray *input,
- const gchar *charset,
- GError **err)
- {
- gchar *d;
- gint32 r, clen, dlen, uc_len;
- UChar *tmp_buf;
- UErrorCode uc_err = U_ZERO_ERROR;
- UConverter *utf8_converter;
- struct rspamd_charset_converter *conv;
-
- conv = rspamd_mime_get_converter_cached (charset, &uc_err);
- utf8_converter = rspamd_get_utf8_converter ();
-
- if (conv == NULL) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot open converter for %s: %s",
- charset, u_errorName (uc_err));
-
- return FALSE;
- }
-
- tmp_buf = g_new (UChar, input->len + 1);
- uc_err = U_ZERO_ERROR;
- uc_len = rspamd_converter_to_uchars (conv,
- tmp_buf,
- input->len + 1,
- input->data,
- input->len,
- &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot convert data to unicode from %s: %s",
- charset, u_errorName (uc_err));
- g_free (tmp_buf);
-
- return FALSE;
- }
-
- /* Now, convert to utf8 */
- clen = ucnv_getMaxCharSize (utf8_converter);
- dlen = UCNV_GET_MAX_BYTES_FOR_STRING (uc_len, clen);
- d = rspamd_mempool_alloc (task->task_pool, dlen);
- r = ucnv_fromUChars (utf8_converter, d, dlen,
- tmp_buf, uc_len, &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_set_error (err, rspamd_iconv_error_quark (), EINVAL,
- "cannot convert data from unicode from %s: %s",
- charset, u_errorName (uc_err));
- g_free (tmp_buf);
-
- return FALSE;
- }
-
- msg_info_task ("converted from %s to UTF-8 inlen: %d, outlen: %d (%d UTF16 chars)",
- charset, input->len, r, uc_len);
- text_part->utf_raw_content = rspamd_mempool_alloc (task->task_pool,
- sizeof (*text_part->utf_raw_content) + sizeof (gpointer) * 4);
- text_part->utf_raw_content->data = d;
- text_part->utf_raw_content->len = r;
- g_free (tmp_buf);
-
- return TRUE;
- }
-
- gboolean
- rspamd_mime_to_utf8_byte_array (GByteArray *in,
- GByteArray *out,
- const gchar *enc)
- {
- gint32 r, clen, dlen;
- UChar *tmp_buf;
- UErrorCode uc_err = U_ZERO_ERROR;
- UConverter *utf8_converter;
- struct rspamd_charset_converter *conv;
- rspamd_ftok_t charset_tok;
-
- RSPAMD_FTOK_FROM_STR (&charset_tok, enc);
-
- if (rspamd_mime_charset_utf_check (&charset_tok, (gchar *)in->data, in->len,
- FALSE)) {
- g_byte_array_set_size (out, in->len);
- memcpy (out->data, in->data, out->len);
-
- return TRUE;
- }
-
- utf8_converter = rspamd_get_utf8_converter ();
- conv = rspamd_mime_get_converter_cached (enc, &uc_err);
-
- if (conv == NULL) {
- return FALSE;
- }
-
- tmp_buf = g_new (UChar, in->len + 1);
- uc_err = U_ZERO_ERROR;
- r = rspamd_converter_to_uchars (conv,
- tmp_buf, in->len + 1,
- in->data, in->len, &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_free (tmp_buf);
-
- return FALSE;
- }
-
- /* Now, convert to utf8 */
- clen = ucnv_getMaxCharSize (utf8_converter);
- dlen = UCNV_GET_MAX_BYTES_FOR_STRING (r, clen);
- g_byte_array_set_size (out, dlen);
- r = ucnv_fromUChars (utf8_converter, out->data, dlen, tmp_buf, r, &uc_err);
-
- if (!U_SUCCESS (uc_err)) {
- g_free (tmp_buf);
-
- return FALSE;
- }
-
- g_free (tmp_buf);
- out->len = r;
-
- return TRUE;
- }
-
- void
- rspamd_mime_charset_utf_enforce (gchar *in, gsize len)
- {
- const gchar *end, *p;
- gsize remain = len;
-
- /* Now we validate input and replace bad characters with '?' symbol */
- p = in;
-
- while (remain > 0 && !g_utf8_validate (p, remain, &end)) {
- gchar *valid;
-
- if (end >= in + len) {
- if (p < in + len) {
- memset ((gchar *)p, '?', (in + len) - p);
- }
- break;
- }
-
- valid = g_utf8_find_next_char (end, in + len);
-
- if (!valid) {
- valid = in + len;
- }
-
- if (valid > end) {
- memset ((gchar *)end, '?', valid - end);
- p = valid;
- remain = (in + len) - p;
- }
- else {
- break;
- }
- }
- }
-
- const char *
- rspamd_mime_charset_find_by_content (const gchar *in, gsize inlen)
- {
- static UCharsetDetector *csd;
- const UCharsetMatch **csm, *sel = NULL;
- UErrorCode uc_err = U_ZERO_ERROR;
- gint32 matches, i, max_conf = G_MININT32, conf;
- gdouble mean = 0.0, stddev = 0.0;
-
- if (csd == NULL) {
- csd = ucsdet_open (&uc_err);
-
- g_assert (csd != NULL);
- }
-
- /* If text is ascii, then we can treat it as utf8 data */
- for (i = 0; i < inlen; i++) {
- if ((((guchar)in[i]) & 0x80) != 0) {
- goto detect;
- }
- }
-
- return UTF8_CHARSET;
-
- detect:
-
- ucsdet_setText (csd, in, inlen, &uc_err);
- csm = ucsdet_detectAll (csd, &matches, &uc_err);
-
- for (i = 0; i < matches; i ++) {
- if ((conf = ucsdet_getConfidence (csm[i], &uc_err)) > max_conf) {
- max_conf = conf;
- sel = csm[i];
- }
-
- mean += (conf - mean) / (i + 1);
- gdouble err = fabs (conf - mean);
- stddev += (err - stddev) / (i + 1);
- }
-
- if (sel && ((max_conf > 50) || (max_conf - mean > stddev * 1.25))) {
- return ucsdet_getName (sel, &uc_err);
- }
-
- return NULL;
- }
-
- gboolean
- rspamd_mime_charset_utf_check (rspamd_ftok_t *charset,
- gchar *in, gsize len, gboolean content_check)
- {
- const gchar *real_charset;
-
- if (utf_compatible_re == NULL) {
- utf_compatible_re = rspamd_regexp_new (
- "^(?:utf-?8.*)|(?:us-ascii)|(?:ascii)|(?:ansi.*)|(?:CSASCII)$",
- "i", NULL);
- }
-
- if (charset->len == 0 ||
- rspamd_regexp_match (utf_compatible_re,
- charset->begin, charset->len, TRUE)) {
- /*
- * In case of UTF8 charset we still can check the content to find
- * corner cases
- */
- if (content_check) {
- real_charset = rspamd_mime_charset_find_by_content (in,
- MIN (RSPAMD_CHARSET_MAX_CONTENT, len));
-
- if (real_charset) {
-
- if (rspamd_regexp_match (utf_compatible_re,
- real_charset, strlen (real_charset), TRUE)) {
- RSPAMD_FTOK_ASSIGN (charset, UTF8_CHARSET);
-
- return TRUE;
- }
- else {
- charset->begin = real_charset;
- charset->len = strlen (real_charset);
-
- return FALSE;
- }
- }
- }
-
- rspamd_mime_charset_utf_enforce (in, len);
-
- return TRUE;
- }
-
- return FALSE;
- }
-
- void
- rspamd_mime_text_part_maybe_convert (struct rspamd_task *task,
- struct rspamd_mime_text_part *text_part)
- {
- GError *err = NULL;
- const gchar *charset = NULL;
- gboolean checked = FALSE, need_charset_heuristic = TRUE;
- GByteArray *part_content;
- rspamd_ftok_t charset_tok;
- struct rspamd_mime_part *part = text_part->mime_part;
-
- if (rspamd_str_has_8bit (text_part->raw.begin, text_part->raw.len)) {
- text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_8BIT;
- }
-
- /* Allocate copy storage */
- part_content = g_byte_array_sized_new (text_part->parsed.len);
- memcpy (part_content->data, text_part->parsed.begin, text_part->parsed.len);
- part_content->len = text_part->parsed.len;
- rspamd_mempool_add_destructor (task->task_pool,
- (rspamd_mempool_destruct_t)g_byte_array_unref, part_content);
-
- if (rspamd_str_has_8bit (text_part->parsed.begin, text_part->parsed.len)) {
- text_part->flags |= RSPAMD_MIME_TEXT_PART_FLAG_8BIT_ENCODED;
- }
-
- if (!(text_part->flags & RSPAMD_MIME_TEXT_PART_FLAG_8BIT_ENCODED)) {
- need_charset_heuristic = FALSE;
- }
-
- if (task->cfg && task->cfg->raw_mode) {
- SET_PART_RAW (text_part);
- text_part->utf_raw_content = part_content;
-
- return;
- }
-
- if (part->ct->charset.len == 0) {
- if (need_charset_heuristic) {
- charset = rspamd_mime_charset_find_by_content (part_content->data,
- MIN (RSPAMD_CHARSET_MAX_CONTENT, part_content->len));
-
- if (charset != NULL) {
- msg_info_task ("detected charset %s", charset);
- }
-
- checked = TRUE;
- text_part->real_charset = charset;
- }
- else {
- SET_PART_UTF (text_part);
- text_part->utf_raw_content = part_content;
- text_part->real_charset = UTF8_CHARSET;
-
- return;
- }
- }
- else {
- charset = rspamd_mime_detect_charset (&part->ct->charset,
- task->task_pool);
-
- if (charset == NULL) {
- charset = rspamd_mime_charset_find_by_content (part_content->data,
- MIN (RSPAMD_CHARSET_MAX_CONTENT, part_content->len));
- msg_info_task ("detected charset: %s", charset);
- checked = TRUE;
- text_part->real_charset = charset;
- }
- }
-
- if (charset == NULL) {
- msg_info_task ("<%s>: has invalid charset", task->message_id);
- SET_PART_RAW (text_part);
- text_part->utf_raw_content = part_content;
-
- return;
- }
-
- RSPAMD_FTOK_FROM_STR (&charset_tok, charset);
-
- if (rspamd_mime_charset_utf_check (&charset_tok, part_content->data,
- part_content->len, !checked)) {
- SET_PART_UTF (text_part);
- text_part->utf_raw_content = part_content;
- text_part->real_charset = UTF8_CHARSET;
-
- return;
- }
- else {
- charset = charset_tok.begin;
-
- if (!rspamd_mime_text_part_utf8_convert (task, text_part,
- part_content, charset, &err)) {
- msg_warn_task ("<%s>: cannot convert from %s to utf8: %s",
- task->message_id,
- charset,
- err ? err->message : "unknown problem");
- SET_PART_RAW (text_part);
- g_error_free (err);
-
- text_part->utf_raw_content = part_content;
- return;
- }
-
- text_part->real_charset = charset;
- }
-
- SET_PART_UTF (text_part);
- }
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