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|
/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "istream.h"
#include "buffer.h"
#include "str.h"
#include "rfc822-parser.h"
#include "message-address.h"
#include "message-parser.h"
#include "message-decoder.h"
#include "mail-storage.h"
#include "index-mail.h"
#include "fts-parser.h"
#include "fts-user.h"
#include "fts-language.h"
#include "fts-tokenizer.h"
#include "fts-filter.h"
#include "fts-api-private.h"
#include "fts-build-mail.h"
/* there are other characters as well, but this doesn't have to be exact */
#define IS_WORD_WHITESPACE(c) \
((c) == ' ' || (c) == '\t' || (c) == '\n')
/* if we see a word larger than this, just go ahead and split it from
wherever */
#define MAX_WORD_SIZE 1024
struct fts_mail_build_context {
struct mail *mail;
struct fts_backend_update_context *update_ctx;
char *content_type, *content_disposition;
struct fts_parser *body_parser;
buffer_t *word_buf, *pending_input;
struct fts_user_language *cur_user_lang;
};
static int fts_build_data(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size, bool last);
static void fts_build_parse_content_type(struct fts_mail_build_context *ctx,
const struct message_header_line *hdr)
{
struct rfc822_parser_context parser;
string_t *content_type;
if (ctx->content_type != NULL)
return;
rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL);
rfc822_skip_lwsp(&parser);
T_BEGIN {
content_type = t_str_new(64);
(void)rfc822_parse_content_type(&parser, content_type);
ctx->content_type = str_lcase(i_strdup(str_c(content_type)));
} T_END;
rfc822_parser_deinit(&parser);
}
static void
fts_build_parse_content_disposition(struct fts_mail_build_context *ctx,
const struct message_header_line *hdr)
{
/* just pass it as-is to backend. */
i_free(ctx->content_disposition);
ctx->content_disposition =
i_strndup(hdr->full_value, hdr->full_value_len);
}
static void fts_parse_mail_header(struct fts_mail_build_context *ctx,
const struct message_block *raw_block)
{
const struct message_header_line *hdr = raw_block->hdr;
if (strcasecmp(hdr->name, "Content-Type") == 0)
fts_build_parse_content_type(ctx, hdr);
else if (strcasecmp(hdr->name, "Content-Disposition") == 0)
fts_build_parse_content_disposition(ctx, hdr);
}
static int
fts_build_unstructured_header(struct fts_mail_build_context *ctx,
const struct message_header_line *hdr)
{
const unsigned char *data = hdr->full_value;
unsigned char *buf = NULL;
unsigned int i;
int ret;
/* @UNSAFE: if there are any NULs, replace them with spaces */
for (i = 0; i < hdr->full_value_len; i++) {
if (hdr->full_value[i] == '\0') {
if (buf == NULL) {
buf = i_memdup(hdr->full_value,
hdr->full_value_len);
data = buf;
}
buf[i] = ' ';
}
}
ret = fts_build_data(ctx, data, hdr->full_value_len, TRUE);
i_free(buf);
return ret;
}
static void fts_mail_build_ctx_set_lang(struct fts_mail_build_context *ctx,
struct fts_user_language *user_lang)
{
i_assert(user_lang != NULL);
ctx->cur_user_lang = user_lang;
/* reset tokenizer between fields - just to be sure no state
leaks between fields (especially if previous indexing had
failed) */
fts_tokenizer_reset(user_lang->index_tokenizer);
}
static void
fts_build_tokenized_hdr_update_lang(struct fts_mail_build_context *ctx,
const struct message_header_line *hdr)
{
/* Headers that don't contain any human language will only be
translated to lowercase - no stemming or other filtering. There's
unfortunately no pefect way of detecting which headers contain
human languages, so we check with fts_header_has_language if the
header is something that's supposed to containing human text. */
if (fts_header_has_language(hdr->name))
ctx->cur_user_lang = NULL;
else {
fts_mail_build_ctx_set_lang(ctx,
fts_user_get_data_lang(ctx->update_ctx->backend->ns->user));
}
}
static int fts_build_mail_header(struct fts_mail_build_context *ctx,
const struct message_block *block)
{
const struct message_header_line *hdr = block->hdr;
struct fts_backend_build_key key;
int ret;
if (hdr->eoh)
return 0;
/* hdr->full_value is always set because we get the block from
message_decoder */
i_zero(&key);
key.uid = ctx->mail->uid;
key.type = block->part->physical_pos == 0 ?
FTS_BACKEND_BUILD_KEY_HDR : FTS_BACKEND_BUILD_KEY_MIME_HDR;
key.part = block->part;
key.hdr_name = hdr->name;
if ((ctx->update_ctx->backend->flags &
FTS_BACKEND_FLAG_TOKENIZED_INPUT) != 0)
fts_build_tokenized_hdr_update_lang(ctx, hdr);
if (!fts_backend_update_set_build_key(ctx->update_ctx, &key))
return 0;
if (!message_header_is_address(hdr->name)) {
/* regular unstructured header */
ret = fts_build_unstructured_header(ctx, hdr);
} else T_BEGIN {
/* message address. normalize it to give better
search results. */
struct message_address *addr;
string_t *str;
addr = message_address_parse(pool_datastack_create(),
hdr->full_value,
hdr->full_value_len,
UINT_MAX, 0);
str = t_str_new(hdr->full_value_len);
message_address_write(str, addr);
ret = fts_build_data(ctx, str_data(str), str_len(str), TRUE);
} T_END;
if ((ctx->update_ctx->backend->flags &
FTS_BACKEND_FLAG_TOKENIZED_INPUT) != 0) {
/* index the header name itself using data-language. */
struct fts_user_language *prev_lang = ctx->cur_user_lang;
fts_mail_build_ctx_set_lang(ctx,
fts_user_get_data_lang(ctx->update_ctx->backend->ns->user));
key.hdr_name = "";
if (fts_backend_update_set_build_key(ctx->update_ctx, &key)) {
if (fts_build_data(ctx, (const void *)hdr->name,
strlen(hdr->name), TRUE) < 0)
ret = -1;
}
fts_mail_build_ctx_set_lang(ctx, prev_lang);
}
return ret;
}
static bool
fts_build_body_begin(struct fts_mail_build_context *ctx,
struct message_part *part, bool *binary_body_r)
{
struct mail_storage *storage;
struct fts_parser_context parser_context;
struct fts_backend_build_key key;
i_assert(ctx->body_parser == NULL);
*binary_body_r = FALSE;
i_zero(&key);
key.uid = ctx->mail->uid;
key.part = part;
i_zero(&parser_context);
parser_context.content_type = ctx->content_type != NULL ?
ctx->content_type : "text/plain";
if (str_begins(parser_context.content_type, "multipart/")) {
/* multiparts are never indexed, only their contents */
return FALSE;
}
storage = mailbox_get_storage(ctx->mail->box);
parser_context.user = mail_storage_get_user(storage);
parser_context.content_disposition = ctx->content_disposition;
if (fts_parser_init(&parser_context, &ctx->body_parser)) {
/* extract text using the the returned parser */
*binary_body_r = TRUE;
key.type = FTS_BACKEND_BUILD_KEY_BODY_PART;
} else if (str_begins(parser_context.content_type, "text/") ||
str_begins(parser_context.content_type, "message/")) {
/* text body parts */
key.type = FTS_BACKEND_BUILD_KEY_BODY_PART;
ctx->body_parser = fts_parser_text_init();
} else {
/* possibly binary */
if ((ctx->update_ctx->backend->flags &
FTS_BACKEND_FLAG_BINARY_MIME_PARTS) == 0)
return FALSE;
*binary_body_r = TRUE;
key.type = FTS_BACKEND_BUILD_KEY_BODY_PART_BINARY;
}
key.body_content_type = parser_context.content_type;
key.body_content_disposition = ctx->content_disposition;
ctx->cur_user_lang = NULL;
if (!fts_backend_update_set_build_key(ctx->update_ctx, &key)) {
if (ctx->body_parser != NULL)
(void)fts_parser_deinit(&ctx->body_parser, NULL);
return FALSE;
}
return TRUE;
}
static int
fts_build_add_tokens_with_filter(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size)
{
struct fts_tokenizer *tokenizer = ctx->cur_user_lang->index_tokenizer;
struct fts_filter *filter = ctx->cur_user_lang->filter;
const char *token, *error;
int ret = 1, ret2;
while (ret > 0) T_BEGIN {
ret = ret2 = fts_tokenizer_next(tokenizer, data, size, &token, &error);
if (ret2 > 0 && filter != NULL)
ret2 = fts_filter_filter(filter, &token, &error);
if (ret2 < 0) {
mail_set_critical(ctx->mail,
"fts: Couldn't create indexable tokens: %s",
error);
}
if (ret2 > 0) {
if (fts_backend_update_build_more(ctx->update_ctx,
(const void *)token,
strlen(token)) < 0) {
mail_storage_set_internal_error(ctx->mail->box->storage);
ret = -1;
}
}
} T_END;
return ret;
}
static int
fts_detect_language(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size, bool last,
const struct fts_language **lang_r)
{
struct mail_user *user = ctx->update_ctx->backend->ns->user;
struct fts_language_list *lang_list = fts_user_get_language_list(user);
const struct fts_language *lang;
const char *error;
switch (fts_language_detect(lang_list, data, size, &lang, &error)) {
case FTS_LANGUAGE_RESULT_SHORT:
/* save the input so far and try again later */
buffer_append(ctx->pending_input, data, size);
if (last) {
/* we've run out of data. use the default language. */
*lang_r = fts_language_list_get_first(lang_list);
return 1;
}
return 0;
case FTS_LANGUAGE_RESULT_UNKNOWN:
/* use the default language */
*lang_r = fts_language_list_get_first(lang_list);
return 1;
case FTS_LANGUAGE_RESULT_OK:
*lang_r = lang;
return 1;
case FTS_LANGUAGE_RESULT_ERROR:
/* internal language detection library failure
(e.g. invalid config). don't index anything. */
mail_set_critical(ctx->mail,
"Language detection library initialization failed: %s",
error);
return -1;
default:
i_unreached();
}
}
static int
fts_build_tokenized(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size, bool last)
{
struct mail_user *user = ctx->update_ctx->backend->ns->user;
const struct fts_language *lang;
int ret;
if (ctx->cur_user_lang != NULL) {
/* we already have a language */
} else if ((ret = fts_detect_language(ctx, data, size, last, &lang)) < 0) {
return -1;
} else if (ret == 0) {
/* wait for more data */
return 0;
} else {
fts_mail_build_ctx_set_lang(ctx, fts_user_language_find(user, lang));
if (ctx->pending_input->used > 0) {
if (fts_build_add_tokens_with_filter(ctx,
ctx->pending_input->data,
ctx->pending_input->used) < 0)
return -1;
buffer_set_used_size(ctx->pending_input, 0);
}
}
if (fts_build_add_tokens_with_filter(ctx, data, size) < 0)
return -1;
if (last) {
if (fts_build_add_tokens_with_filter(ctx, NULL, 0) < 0)
return -1;
}
return 0;
}
static int
fts_build_full_words(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size, bool last)
{
size_t i;
/* we'll need to send only full words to the backend */
if (ctx->word_buf != NULL && ctx->word_buf->used > 0) {
/* continuing previous word */
for (i = 0; i < size; i++) {
if (IS_WORD_WHITESPACE(data[i]))
break;
}
buffer_append(ctx->word_buf, data, i);
data += i;
size -= i;
if (size == 0 && ctx->word_buf->used < MAX_WORD_SIZE && !last) {
/* word is still not finished */
return 0;
}
/* we have a full word, index it */
if (fts_backend_update_build_more(ctx->update_ctx,
ctx->word_buf->data,
ctx->word_buf->used) < 0) {
mail_storage_set_internal_error(ctx->mail->box->storage);
return -1;
}
buffer_set_used_size(ctx->word_buf, 0);
}
/* find the boundary for last word */
if (last)
i = size;
else {
for (i = size; i > 0; i--) {
if (IS_WORD_WHITESPACE(data[i-1]))
break;
}
}
if (fts_backend_update_build_more(ctx->update_ctx, data, i) < 0) {
mail_storage_set_internal_error(ctx->mail->box->storage);
return -1;
}
if (i < size) {
if (ctx->word_buf == NULL) {
ctx->word_buf =
buffer_create_dynamic(default_pool, 128);
}
buffer_append(ctx->word_buf, data + i, size - i);
}
return 0;
}
static int fts_build_data(struct fts_mail_build_context *ctx,
const unsigned char *data, size_t size, bool last)
{
if ((ctx->update_ctx->backend->flags &
FTS_BACKEND_FLAG_TOKENIZED_INPUT) != 0) {
return fts_build_tokenized(ctx, data, size, last);
} else if ((ctx->update_ctx->backend->flags &
FTS_BACKEND_FLAG_BUILD_FULL_WORDS) != 0) {
return fts_build_full_words(ctx, data, size, last);
} else {
if (fts_backend_update_build_more(ctx->update_ctx, data, size) < 0) {
mail_storage_set_internal_error(ctx->mail->box->storage);
return -1;
}
return 0;
}
}
static int fts_build_body_block(struct fts_mail_build_context *ctx,
const struct message_block *block, bool last)
{
i_assert(block->hdr == NULL);
return fts_build_data(ctx, block->data, block->size, last);
}
static int fts_body_parser_finish(struct fts_mail_build_context *ctx,
const char **retriable_err_msg_r,
bool *may_need_retry_r)
{
struct message_block block;
const char *retriable_error;
int ret = 0;
int deinit_ret;
*may_need_retry_r = FALSE;
do {
i_zero(&block);
fts_parser_more(ctx->body_parser, &block);
if (fts_build_body_block(ctx, &block, FALSE) < 0) {
ret = -1;
break;
}
} while (block.size > 0);
deinit_ret = fts_parser_deinit(&ctx->body_parser, &retriable_error);
if (ret < 0) {
/* indexing already failed - we don't want to retry
in any case */
return -1;
}
if (deinit_ret == 0) {
/* retry the parsing */
*may_need_retry_r = TRUE;
*retriable_err_msg_r = retriable_error;
return -1;
}
if (deinit_ret < 0) {
mail_storage_set_internal_error(ctx->mail->box->storage);
return -1;
}
return 0;
}
static void
load_header_filter(const char *key, struct fts_backend *backend,
ARRAY_TYPE(const_string) list, bool *matches_all_r)
{
const char *str = mail_user_plugin_getenv(backend->ns->user, key);
*matches_all_r = FALSE;
if (str == NULL || *str == '\0')
return;
char **entries = p_strsplit_spaces(backend->header_filters.pool, str, " ");
for (char **entry = entries; *entry != NULL; ++entry) {
const char *value = str_lcase(*entry);
array_push_back(&list, &value);
if (*value == '*') {
*matches_all_r = TRUE;
break;
}
}
array_sort(&list, i_strcmp_p);
}
static struct fts_header_filters *
load_header_filters(struct fts_backend *backend)
{
struct fts_header_filters *filters = &backend->header_filters;
if (!filters->loaded) {
bool match_all;
/* match_all return ignored in includes */
load_header_filter("fts_header_includes", backend,
filters->includes, &match_all);
load_header_filter("fts_header_excludes", backend,
filters->excludes, &match_all);
filters->loaded = TRUE;
filters->exclude_is_default = match_all;
}
return filters;
}
/* This performs comparison between two strings, where the second one can end
* with the wildcard '*'. When the match reaches a '*' on the pitem side, zero
* (match) is returned regardles of the remaining characters.
*
* The function obeys the same lexicographic order as i_strcmp_p() and
* strcmp(), which is the reason for the casts to unsigned before comparing.
*/
static int ATTR_PURE
header_prefix_cmp(const char *const *pkey, const char *const *pitem)
{
const char *key = *pkey;
const char *item = *pitem;
while (*key == *item && *key != '\0') key++, item++;
return item[0] == '*' && item[1] == '\0' ? 0 :
(unsigned char)*key - (unsigned char)*item;
}
static bool
is_header_indexable(const char *header_name, struct fts_backend *backend)
{
bool indexable;
T_BEGIN {
struct fts_header_filters *filters = load_header_filters(backend);
const char *hdr = t_str_lcase(header_name);
if (array_bsearch(&filters->includes, &hdr, header_prefix_cmp) != NULL)
indexable = TRUE;
else if (filters->exclude_is_default ||
array_bsearch(&filters->excludes, &hdr, header_prefix_cmp) != NULL)
indexable = FALSE;
else
indexable = TRUE;
} T_END;
return indexable;
}
static int
fts_build_mail_real(struct fts_backend_update_context *update_ctx,
struct mail *mail,
const char **retriable_err_msg_r,
bool *may_need_retry_r)
{
const struct message_parser_settings parser_set = {
.hdr_flags = MESSAGE_HEADER_PARSER_FLAG_CLEAN_ONELINE,
};
struct fts_mail_build_context ctx;
struct istream *input;
struct message_parser_ctx *parser;
struct message_decoder_context *decoder;
struct message_block raw_block, block;
struct message_part *prev_part, *parts;
bool skip_body = FALSE, body_part = FALSE, body_added = FALSE;
bool binary_body;
const char *error;
int ret;
*may_need_retry_r = FALSE;
if (mail_get_stream_because(mail, NULL, NULL, "fts indexing", &input) < 0) {
if (mail->expunged)
return 0;
mail_set_critical(mail, "Failed to read stream: %s",
mailbox_get_last_internal_error(mail->box, NULL));
return -1;
}
i_zero(&ctx);
ctx.update_ctx = update_ctx;
ctx.mail = mail;
if ((update_ctx->backend->flags & FTS_BACKEND_FLAG_TOKENIZED_INPUT) != 0)
ctx.pending_input = buffer_create_dynamic(default_pool, 128);
prev_part = NULL;
parser = message_parser_init(pool_datastack_create(), input, &parser_set);
decoder = message_decoder_init(update_ctx->normalizer, 0);
for (;;) {
ret = message_parser_parse_next_block(parser, &raw_block);
i_assert(ret != 0);
if (ret < 0) {
if (input->stream_errno == 0)
ret = 0;
else {
mail_set_critical(mail, "read(%s) failed: %s",
i_stream_get_name(input),
i_stream_get_error(input));
}
break;
}
if (raw_block.part != prev_part) {
/* body part changed. we're now parsing the end of
boundary, possibly followed by message epilogue */
if (ctx.body_parser != NULL) {
if (fts_body_parser_finish(&ctx, retriable_err_msg_r,
may_need_retry_r) < 0) {
ret = -1;
break;
}
}
message_decoder_set_return_binary(decoder, FALSE);
fts_backend_update_unset_build_key(update_ctx);
prev_part = raw_block.part;
i_free_and_null(ctx.content_type);
i_free_and_null(ctx.content_disposition);
if (raw_block.size != 0) {
/* multipart. skip until beginning of next
part's headers */
skip_body = TRUE;
}
}
if (raw_block.hdr != NULL) {
/* always handle headers */
} else if (raw_block.size == 0) {
/* end of headers */
skip_body = !fts_build_body_begin(&ctx, raw_block.part,
&binary_body);
if (binary_body)
message_decoder_set_return_binary(decoder, TRUE);
body_part = TRUE;
} else {
if (skip_body)
continue;
}
if (!message_decoder_decode_next_block(decoder, &raw_block,
&block))
continue;
if (block.hdr != NULL) {
fts_parse_mail_header(&ctx, &raw_block);
if (is_header_indexable(block.hdr->name, update_ctx->backend) &&
fts_build_mail_header(&ctx, &block) < 0) {
ret = -1;
break;
}
} else if (block.size == 0) {
/* end of headers */
} else {
i_assert(body_part);
if (ctx.body_parser != NULL)
fts_parser_more(ctx.body_parser, &block);
if (fts_build_body_block(&ctx, &block, FALSE) < 0) {
ret = -1;
break;
}
body_added = TRUE;
}
}
if (ctx.body_parser != NULL) {
if (ret == 0)
ret = fts_body_parser_finish(&ctx, retriable_err_msg_r,
may_need_retry_r);
else
(void)fts_parser_deinit(&ctx.body_parser, NULL);
}
if (ret == 0 && body_part && !skip_body && !body_added) {
/* make sure body is added even when it doesn't exist */
block.data = NULL; block.size = 0;
ret = fts_build_body_block(&ctx, &block, TRUE);
}
if (message_parser_deinit_from_parts(&parser, &parts, &error) < 0)
index_mail_set_message_parts_corrupted(mail, error);
message_decoder_deinit(&decoder);
i_free(ctx.content_type);
i_free(ctx.content_disposition);
buffer_free(&ctx.word_buf);
buffer_free(&ctx.pending_input);
return ret < 0 ? -1 : 1;
}
int fts_build_mail(struct fts_backend_update_context *update_ctx,
struct mail *mail)
{
int ret;
/* Number of attempts to be taken if retry is needed */
unsigned int attempts = 2;
const char *retriable_err_msg;
bool may_need_retry;
T_BEGIN {
while ((ret = fts_build_mail_real(update_ctx, mail,
&retriable_err_msg,
&may_need_retry)) < 0 &&
may_need_retry) {
if (--attempts == 0) {
/* Log this as info instead of as error,
because e.g. Tika doesn't differentiate
between temporary errors and invalid
document input. */
i_info("%s - ignoring", retriable_err_msg);
ret = 0;
break;
}
}
} T_END;
return ret;
}
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