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/* Yes, this looks backwards. */
typedef char nonce_t[40];
struct singleid_board {
/* The association with our server */
char server[256];
char handle[256];
unsigned char secret[256];
char type[64];
size_t n_secret;
time_t expires;
/* Book keeping for the records */
nonce_t *records;
size_t first;
size_t total;
size_t count;
int wrapped;
};
int
singleid_board_store_assoc (singleid_board_t *board, const singleid_assoc_t *assoc)
{
assert (board);
assert (assoc);
/* Check that we have enough space to store this information */
if ((assoc->server && strlen (assoc->server) > sizeof (board->server)) ||
(assoc->handle && strlen (assoc->handle) > sizeof (board->handle)) ||
(assoc->n_secret && assoc->n_secret > sizeof (board->secret)) ||
(assoc->type && strlen (assoc->type) > sizeof (board->type)))
return 0;
strcpy (board->server, assoc->server ? assoc->server : "");
strcpy (board->handle, assoc->handle ? assoc->handle : "");
memcpy (board->secret, assoc->secret, assoc->n_secret);
strcpy (board->type, assoc->type ? assoc->type : "");
board->expires = assoc->expires;
return 1;
}
int
singleid_board_find_assoc (singleid_board_t *board, const char *server,
const char *handle, singleid_assoc_t *assoc)
{
assert (board);
assert (assoc);
if (server && (strlen (server) > sizeof (board->server) ||
strcmp (server, board->server) != 0))
return 0;
if (handle && (strlen (handle) > sizeof (board->handle) ||
strcmp (handle, board->handle) != 0))
return 0;
assoc->server = board->server;
assoc->handle = board->handle;
assoc->type = board->type;
assoc->secret = board->secret;
assoc->n_secret = board->n_secret;
assoc->expires = board->expires;
return 1;
}
void
singleid_board_invalidate_assoc (singleid_board_t *board, const char *server,
const char *handle)
{
singleid_assoc_t dummy;
assert (board);
if (singleid_board_find_assoc (board, server, handle, &dummy)) {
board->server[0] = 0;
board->handle[0] = 0;
board->type[0] = 0;
memset (board->secret, 0, sizeof (board->secret));
board->n_secret = 0;
board->expires = 0;
board->secret[0] = 0;
}
}
#define nonce_compare(a, b) \
memcmp (a, b, sizeof (nonce_t))
static void
nonce_put (nonce_t rec, const char *nonce)
{
size_t len = strlen (nonce);
char *dst = (char*)rec;
/* If it's short enough, then just board. Fast */
if (len < sizeof (rec)) {
memcpy (dst, nonce, len);
memset (dst + len, 0, sizeof (rec) - len);
/* Too long, need to compress into the record */
} else {
apr_sha1_ctx_t ctx;
assert (sizeof (nonce_t) == APR_SHA1_DIGESTSIZE + 20);
assert (len > 20);
/* The date prefix we just copy in */
memcpy (dst, nonce, 20);
/* Hash the rest into the buffer */
apr_sha1_init (&ctx);
apr_sha1_update (&ctx, nonce + 20, len - 20);
apr_sha1_final (dst + 20, &ctx);
}
}
static void
insert_nonce_record (singleid_board_t *board, nonce_t rec, size_t at)
{
nonce_t *records = board->records;
size_t from, to, num;
assert (board->total > 2);
assert (at < board->total);
assert (at != board->first);
/* Insertion right after latest, either ancient, more likely top */
if (at == board->first + 1 % board->total) {
/* We can just copy in at this point */
/* Our ring has empty space in it, so always push forwards, but only until first */
} else if (!board->wrapped) {
memmove (records + at + 1, records + at, sizeof (rec) * (board->first - at));
board->first += 1;
/* Move data backwards to make space */
} else if (board->first < at) {
memmove (records + board->first + 2, records + board->first + 1,
sizeof (rec) * (at - board->first));
/* Move data forwards to make space simply */
} else {
memmove (records + at + 1, records + at, sizeof (rec) * (board->first - at - 1));
}
memcpy (records[at], rec, sizeof (rec));
++board->count;
/* Track whether we have a full ring or not. */
if (!board->wrapped && board->count > board->total)
board->wrapped = 1;
}
int
singleid_board_check_nonce (singleid_board_t *board, const char *nonce)
{
nonce_t *records;
nonce_t rec;
size_t at, lower, upper, mid;
int res;
assert (board);
assert (nonce);
assert (board->records);
assert (board->first < board->total);
nonce_put (rec, nonce);
records = board->records;
/* Best case scenario, new nonce is higher than our latest one */
res = nonce_compare (rec, records[top]);
/* Was the last nonce */
if (res == 0) {
return 1;
/* Newer than anything, push on top */
} else if (res < 0) {
at = (board->first + 1) % board->total;
insert_nonce_record (board, rec, at);
board->first = at;
return 0;
}
/* Do a binary search for the item */
for (lower = 0, upper = board->total; lower < upper; ) {
mid = lower + ((upper - lower) / 2); // Note: not (low + high) / 2 !!
at = at + board->first % board->total;
res = nonce_compare (rec, records[at]);
if (res == 0)
return 1; /* Have the nonce */
else if (res > 0)
lower = mid + 1;
else
upper = mid;
}
insert_nonce_record (board, rec, at);
return 0; /* Didn't find nonce */
}
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