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/* Copyright (c) 2013, Vsevolod Stakhov
* 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 ''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 AUTHOR 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.
*/
#include "config.h"
#include "rcl.h"
#include "rcl_internal.h"
#include "util.h"
#ifdef HAVE_OPENSSL
#include <openssl/err.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
#endif
/**
* @file rcl_util.c
* Utilities for rcl parsing
*/
static void
rspamd_cl_obj_free_internal (rspamd_cl_object_t *obj, gboolean allow_rec)
{
rspamd_cl_object_t *sub, *tmp;
while (obj != NULL) {
if (obj->key != NULL) {
g_free (obj->key);
}
if (obj->type == RSPAMD_CL_STRING) {
g_free (obj->value.sv);
}
else if (obj->type == RSPAMD_CL_ARRAY) {
sub = obj->value.ov;
while (sub != NULL) {
tmp = sub->next;
rspamd_cl_obj_free_internal (sub, FALSE);
sub = tmp;
}
}
else if (obj->type == RSPAMD_CL_OBJECT) {
HASH_ITER (hh, obj->value.ov, sub, tmp) {
HASH_DELETE (hh, obj->value.ov, sub);
rspamd_cl_obj_free_internal (sub, TRUE);
}
}
tmp = obj->next;
g_slice_free1 (sizeof (rspamd_cl_object_t), obj);
obj = tmp;
if (!allow_rec) {
break;
}
}
}
void
rspamd_cl_obj_free (rspamd_cl_object_t *obj)
{
rspamd_cl_obj_free_internal (obj, TRUE);
}
void
rspamd_cl_unescape_json_string (gchar *str)
{
gchar *t = str, *h = str;
gint i, uval;
/* t is target (tortoise), h is source (hare) */
while (*h != '\0') {
if (*h == '\\') {
h ++;
switch (*h) {
case 'n':
*t++ = '\n';
break;
case 'r':
*t++ = '\r';
break;
case 'b':
*t++ = '\b';
break;
case 't':
*t++ = '\t';
break;
case 'f':
*t++ = '\f';
break;
case '\\':
*t++ = '\\';
break;
case '"':
*t++ = '"';
break;
case 'u':
/* Unicode escape */
uval = 0;
for (i = 0; i < 4; i++) {
uval <<= 4;
if (g_ascii_isdigit (h[i])) {
uval += h[i] - '0';
}
else if (h[i] >= 'a' && h[i] <= 'f') {
uval += h[i] - 'a' + 10;
}
else if (h[i] >= 'A' && h[i] <= 'F') {
uval += h[i] - 'A' + 10;
}
}
h += 3;
/* Encode */
if(uval < 0x80) {
t[0] = (char)uval;
t ++;
}
else if(uval < 0x800) {
t[0] = 0xC0 + ((uval & 0x7C0) >> 6);
t[1] = 0x80 + ((uval & 0x03F));
t += 2;
}
else if(uval < 0x10000) {
t[0] = 0xE0 + ((uval & 0xF000) >> 12);
t[1] = 0x80 + ((uval & 0x0FC0) >> 6);
t[2] = 0x80 + ((uval & 0x003F));
t += 3;
}
else if(uval <= 0x10FFFF) {
t[0] = 0xF0 + ((uval & 0x1C0000) >> 18);
t[1] = 0x80 + ((uval & 0x03F000) >> 12);
t[2] = 0x80 + ((uval & 0x000FC0) >> 6);
t[3] = 0x80 + ((uval & 0x00003F));
t += 4;
}
else {
*t++ = '?';
}
break;
default:
*t++ = '?';
break;
}
h ++;
}
else {
*t++ = *h++;
}
}
}
rspamd_cl_object_t*
rspamd_cl_parser_get_object (struct rspamd_cl_parser *parser, GError **err)
{
if (parser->state != RSPAMD_RCL_STATE_INIT && parser->state != RSPAMD_RCL_STATE_ERROR) {
return parser->top_obj;
}
return NULL;
}
void
rspamd_cl_parser_free (struct rspamd_cl_parser *parser)
{
struct rspamd_cl_stack *stack, *stmp;
struct rspamd_cl_macro *macro, *mtmp;
struct rspamd_cl_chunk *chunk, *ctmp;
struct rspamd_cl_pubkey *key, *ktmp;
if (parser->top_obj != NULL) {
rspamd_cl_obj_free (parser->top_obj);
}
LL_FOREACH_SAFE (parser->stack, stack, stmp) {
g_slice_free1 (sizeof (struct rspamd_cl_stack), stack);
}
HASH_ITER (hh, parser->macroes, macro, mtmp) {
g_slice_free1 (sizeof (struct rspamd_cl_macro), macro);
}
LL_FOREACH_SAFE (parser->chunks, chunk, ctmp) {
g_slice_free1 (sizeof (struct rspamd_cl_chunk), chunk);
}
LL_FOREACH_SAFE (parser->keys, key, ktmp) {
g_slice_free1 (sizeof (struct rspamd_cl_pubkey), key);
}
g_slice_free1 (sizeof (struct rspamd_cl_parser), parser);
}
gboolean
rspamd_cl_pubkey_add (struct rspamd_cl_parser *parser, const guchar *key, gsize len, GError **err)
{
struct rspamd_cl_pubkey *nkey;
#ifndef HAVE_OPENSSL
g_set_error (err, RCL_ERROR, RSPAMD_CL_EINTERNAL, "cannot check signatures without openssl");
return FALSE;
#else
BIO *mem;
mem = BIO_new_mem_buf ((void *)key, len);
nkey = g_slice_alloc0 (sizeof (struct rspamd_cl_pubkey));
nkey->key = PEM_read_bio_PUBKEY (mem, &nkey->key, NULL, NULL);
BIO_free (mem);
if (nkey->key == NULL) {
g_slice_free1 (sizeof (struct rspamd_cl_pubkey), nkey);
g_set_error (err, RCL_ERROR, RSPAMD_CL_ESSL, "%s",
ERR_error_string (ERR_get_error (), NULL));
return FALSE;
}
LL_PREPEND (parser->keys, nkey);
#endif
return TRUE;
}
#ifdef CURL_FOUND
struct rspamd_cl_curl_cbdata {
guchar *buf;
gsize buflen;
};
static gsize
rspamd_cl_curl_write_callback (gpointer contents, gsize size, gsize nmemb, gpointer ud)
{
struct rspamd_cl_curl_cbdata *cbdata = ud;
gsize realsize = size * nmemb;
cbdata->buf = g_realloc (cbdata->buf, cbdata->buflen + realsize + 1);
if (cbdata->buf == NULL) {
return 0;
}
memcpy (&(cbdata->buf[cbdata->buflen]), contents, realsize);
cbdata->buflen += realsize;
cbdata->buf[cbdata->buflen] = 0;
return realsize;
}
#endif
/**
* Fetch a url and save results to the memory buffer
* @param url url to fetch
* @param len length of url
* @param buf target buffer
* @param buflen target length
* @return
*/
static gboolean
rspamd_cl_fetch_url (const guchar *url, gsize len, guchar **buf, gsize *buflen, GError **err)
{
char urlbuf[PATH_MAX];
rspamd_snprintf (urlbuf, sizeof (urlbuf), "%*s", len, url);
#ifdef HAVE_FETCH_H
struct url *fetch_url;
struct url_stat us;
FILE *in;
guchar *buf;
fetch_url = fetchParseURL (urlbuf);
if (fetch_url == NULL) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "invalid URL %s: %s",
urlbuf, strerror (errno));
return FALSE;
}
if ((in = fetchXGet (fetch_url, &us, "")) == NULL) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot fetch URL %s: %s",
urlbuf, strerror (errno));
fetchFreeURL (fetch_url);
return FALSE;
}
*buflen = us.size;
*buf = g_malloc (*buflen);
if (buf == NULL) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot allocate buffer for URL %s: %s",
urlbuf, strerror (errno));
fclose (in);
fetchFreeURL (fetch_url);
return FALSE;
}
if (fread (*buf, *buflen, 1, in) != 1) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot read URL %s: %s",
urlbuf, strerror (errno));
fclose (in);
fetchFreeURL (fetch_url);
return FALSE;
}
fetchFreeURL (fetch_url);
return TRUE;
#elif defined(CURL_FOUND)
CURL *curl;
gint r;
struct rspamd_cl_curl_cbdata cbdata;
curl = curl_easy_init ();
if (curl == NULL) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EINTERNAL, "CURL interface is broken");
return FALSE;
}
if ((r = curl_easy_setopt (curl, CURLOPT_URL, urlbuf)) != CURLE_OK) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "invalid URL %s: %s",
urlbuf, curl_easy_strerror (r));
curl_easy_cleanup (curl);
return FALSE;
}
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, rspamd_cl_curl_write_callback);
cbdata.buf = *buf;
cbdata.buflen = *buflen;
curl_easy_setopt (curl, CURLOPT_WRITEDATA, &cbdata);
if ((r = curl_easy_perform (curl)) != CURLE_OK) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "error fetching URL %s: %s",
urlbuf, curl_easy_strerror (r));
curl_easy_cleanup (curl);
if (buf != NULL) {
g_free (buf);
}
return FALSE;
}
*buf = cbdata.buf;
*buflen = cbdata.buflen;
return TRUE;
#else
g_set_error (err, RCL_ERROR, RSPAMD_CL_EINTERNAL, "URL support is disabled");
return FALSE;
#endif
}
/**
* Fetch a file and save results to the memory buffer
* @param filename filename to fetch
* @param len length of filename
* @param buf target buffer
* @param buflen target length
* @return
*/
static gboolean
rspamd_cl_fetch_file (const guchar *filename, gsize len, guchar **buf, gsize *buflen, GError **err)
{
gint fd;
struct stat st;
char filebuf[PATH_MAX];
rspamd_snprintf (filebuf, sizeof (filebuf), "%*s", len, filename);
if (stat (filebuf, &st) == -1) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot stat file %s: %s",
filebuf, strerror (errno));
return FALSE;
}
if ((fd = open (filebuf, O_RDONLY)) == -1) {
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot open file %s: %s",
filebuf, strerror (errno));
return FALSE;
}
if ((*buf = mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
close (fd);
g_set_error (err, RCL_ERROR, RSPAMD_CL_EIO, "cannot mmap file %s: %s",
filebuf, strerror (errno));
return FALSE;
}
*buflen = st.st_size;
close (fd);
return TRUE;
}
/**
* Include an url to configuration
* @param data
* @param len
* @param parser
* @param err
* @return
*/
static gboolean
rspamd_cl_include_url (const guchar *data, gsize len, struct rspamd_cl_parser *parser, GError **err)
{
gboolean res;
guchar *buf = NULL;
gsize buflen = 0;
struct rspamd_cl_chunk *chunk;
if (!rspamd_cl_fetch_url (data, len, &buf, &buflen, err)) {
return FALSE;
}
res = rspamd_cl_parser_add_chunk (parser, buf, buflen, err);
if (res == TRUE) {
/* Remove chunk from the stack */
chunk = parser->chunks;
if (chunk != NULL) {
parser->chunks = chunk->next;
g_slice_free1 (sizeof (struct rspamd_cl_chunk), chunk);
}
}
g_free (buf);
return res;
}
/**
* Include a file to configuration
* @param data
* @param len
* @param parser
* @param err
* @return
*/
static gboolean
rspamd_cl_include_file (const guchar *data, gsize len, struct rspamd_cl_parser *parser, GError **err)
{
gboolean res;
struct rspamd_cl_chunk *chunk;
guchar *buf = NULL;
gsize buflen;
if (!rspamd_cl_fetch_file (data, len, &buf, &buflen, err)) {
return FALSE;
}
res = rspamd_cl_parser_add_chunk (parser, buf, buflen, err);
if (res == TRUE) {
/* Remove chunk from the stack */
chunk = parser->chunks;
if (chunk != NULL) {
parser->chunks = chunk->next;
g_slice_free1 (sizeof (struct rspamd_cl_chunk), chunk);
}
}
munmap (buf, buflen);
return res;
}
/**
* Handle include macro
* @param data include data
* @param len length of data
* @param ud user data
* @param err error ptr
* @return
*/
gboolean
rspamd_cl_include_handler (const guchar *data, gsize len, gpointer ud, GError **err)
{
struct rspamd_cl_parser *parser = ud;
if (*data == '/') {
/* Try to load a file */
return rspamd_cl_include_file (data, len, parser, err);
}
return rspamd_cl_include_url (data, len, parser, err);
}
/**
* Handle includes macro
* @param data include data
* @param len length of data
* @param ud user data
* @param err error ptr
* @return
*/
gboolean
rspamd_cl_includes_handler (const guchar *data, gsize len, gpointer ud, GError **err)
{
struct rspamd_cl_parser *parser = ud;
return TRUE;
}
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