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/*
* Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <openssl/sha.h>
#include "golombset.h"
#include "h2o/string_.h"
#include "h2o/http2_casper.h"
#define COOKIE_NAME "h2o_casper"
#define COOKIE_ATTRIBUTES "; Path=/; Expires=Tue, 01 Jan 2030 00:00:00 GMT; Secure"
struct st_h2o_http2_casper_t {
H2O_VECTOR(uint64_t) keys;
unsigned capacity_bits;
unsigned remainder_bits;
h2o_iovec_t cookie_cache;
};
static unsigned calc_key(h2o_http2_casper_t *casper, const char *path, size_t path_len)
{
SHA_CTX ctx;
SHA1_Init(&ctx);
SHA1_Update(&ctx, path, path_len);
union {
unsigned key;
unsigned char bytes[SHA_DIGEST_LENGTH];
} md;
SHA1_Final(md.bytes, &ctx);
return md.key & ((1 << casper->capacity_bits) - 1);
}
h2o_http2_casper_t *h2o_http2_casper_create(unsigned capacity_bits, unsigned remainder_bits)
{
h2o_http2_casper_t *casper = h2o_mem_alloc(sizeof(*casper));
memset(&casper->keys, 0, sizeof(casper->keys));
casper->capacity_bits = capacity_bits;
casper->remainder_bits = remainder_bits;
casper->cookie_cache = (h2o_iovec_t){NULL};
return casper;
}
void h2o_http2_casper_destroy(h2o_http2_casper_t *casper)
{
free(casper->keys.entries);
free(casper->cookie_cache.base);
free(casper);
}
size_t h2o_http2_casper_num_entries(h2o_http2_casper_t *casper)
{
return casper->keys.size;
}
int h2o_http2_casper_lookup(h2o_http2_casper_t *casper, const char *path, size_t path_len, int set)
{
unsigned key = calc_key(casper, path, path_len);
size_t i;
/* FIXME use binary search */
for (i = 0; i != casper->keys.size; ++i)
if (key <= casper->keys.entries[i])
break;
if (i != casper->keys.size && key == casper->keys.entries[i])
return 1;
if (!set)
return 0;
/* we need to set a new value */
free(casper->cookie_cache.base);
casper->cookie_cache = (h2o_iovec_t){NULL};
h2o_vector_reserve(NULL, &casper->keys, casper->keys.size + 1);
memmove(casper->keys.entries + i + 1, casper->keys.entries + i, (casper->keys.size - i) * sizeof(casper->keys.entries[0]));
++casper->keys.size;
casper->keys.entries[i] = key;
return 0;
}
void h2o_http2_casper_consume_cookie(h2o_http2_casper_t *casper, const char *cookie, size_t cookie_len)
{
h2o_iovec_t binary = {NULL};
uint64_t tiny_keys_buf[128], *keys = tiny_keys_buf;
/* check the name of the cookie */
if (!(cookie_len > sizeof(COOKIE_NAME "=") - 1 && memcmp(cookie, H2O_STRLIT(COOKIE_NAME "=")) == 0))
goto Exit;
/* base64 decode */
if ((binary = h2o_decode_base64url(NULL, cookie + sizeof(COOKIE_NAME "=") - 1, cookie_len - (sizeof(COOKIE_NAME "=") - 1)))
.base == NULL)
goto Exit;
/* decode GCS, either using tiny_keys_buf or using heap */
size_t capacity = sizeof(tiny_keys_buf) / sizeof(tiny_keys_buf[0]), num_keys;
while (num_keys = capacity, golombset_decode(casper->remainder_bits, binary.base, binary.len, keys, &num_keys) != 0) {
if (keys != tiny_keys_buf) {
free(keys);
keys = tiny_keys_buf; /* reset to something that would not trigger call to free(3) */
}
if (capacity >= (size_t)1 << casper->capacity_bits)
goto Exit;
capacity *= 2;
keys = h2o_mem_alloc(capacity * sizeof(*keys));
}
/* copy or merge the entries */
if (num_keys == 0) {
/* nothing to do */
} else if (casper->keys.size == 0) {
h2o_vector_reserve(NULL, &casper->keys, num_keys);
memcpy(casper->keys.entries, keys, num_keys * sizeof(*keys));
casper->keys.size = num_keys;
} else {
uint64_t *orig_keys = casper->keys.entries;
size_t num_orig_keys = casper->keys.size, orig_index = 0, new_index = 0;
memset(&casper->keys, 0, sizeof(casper->keys));
h2o_vector_reserve(NULL, &casper->keys, num_keys + num_orig_keys);
do {
if (orig_keys[orig_index] < keys[new_index]) {
casper->keys.entries[casper->keys.size++] = orig_keys[orig_index++];
} else if (orig_keys[orig_index] > keys[new_index]) {
casper->keys.entries[casper->keys.size++] = keys[new_index++];
} else {
casper->keys.entries[casper->keys.size++] = orig_keys[orig_index];
++orig_index;
++new_index;
}
} while (orig_index != num_orig_keys && new_index != num_keys);
if (orig_index != num_orig_keys) {
do {
casper->keys.entries[casper->keys.size++] = orig_keys[orig_index++];
} while (orig_index != num_orig_keys);
} else if (new_index != num_keys) {
do {
casper->keys.entries[casper->keys.size++] = keys[new_index++];
} while (new_index != num_keys);
}
free(orig_keys);
}
Exit:
if (keys != tiny_keys_buf)
free(keys);
free(binary.base);
}
static size_t append_str(char *dst, const char *s, size_t l)
{
memcpy(dst, s, l);
return l;
}
h2o_iovec_t h2o_http2_casper_get_cookie(h2o_http2_casper_t *casper)
{
if (casper->cookie_cache.base != NULL)
return casper->cookie_cache;
if (casper->keys.size == 0)
return (h2o_iovec_t){NULL};
/* encode as binary */
char tiny_bin_buf[128], *bin_buf = tiny_bin_buf;
size_t bin_capacity = sizeof(tiny_bin_buf), bin_size;
while (bin_size = bin_capacity,
golombset_encode(casper->remainder_bits, casper->keys.entries, casper->keys.size, bin_buf, &bin_size) != 0) {
if (bin_buf != tiny_bin_buf)
free(bin_buf);
bin_capacity *= 2;
bin_buf = h2o_mem_alloc(bin_capacity);
}
char *header_bytes = h2o_mem_alloc(sizeof(COOKIE_NAME "=" COOKIE_ATTRIBUTES) - 1 + (bin_size + 3) * 4 / 3);
size_t header_len = 0;
header_len += append_str(header_bytes + header_len, H2O_STRLIT(COOKIE_NAME "="));
header_len += h2o_base64_encode(header_bytes + header_len, bin_buf, bin_size, 1);
header_len += append_str(header_bytes + header_len, H2O_STRLIT(COOKIE_ATTRIBUTES));
if (bin_buf != tiny_bin_buf)
free(bin_buf);
casper->cookie_cache = h2o_iovec_init(header_bytes, header_len);
return casper->cookie_cache;
}
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