if (len < 4)
goto error;
- bytes = GET_32BIT(d);
+ bytes = toint(GET_32BIT(d));
if (bytes < 0 || len-4 < bytes)
goto error;
struct mpint_pos n, e, d, p, q, iqmp, dmp1, dmq1;
Bignum bd, bp, bq, bdmp1, bdmq1;
+ /*
+ * These blobs were generated from inside PuTTY, so we needn't
+ * treat them as untrusted.
+ */
pos = 4 + GET_32BIT(pubblob);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &e);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &n);
int pos;
struct mpint_pos p, q, g, y, x;
+ /*
+ * These blobs were generated from inside PuTTY, so we needn't
+ * treat them as untrusted.
+ */
pos = 4 + GET_32BIT(pubblob);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &p);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &q);
pos = 8;
if (key->keyblob_len < pos+4)
goto done; /* key is far too short */
- pos += 4 + GET_32BIT(key->keyblob + pos); /* skip key type */
- if (key->keyblob_len < pos+4)
+ len = toint(GET_32BIT(key->keyblob + pos));
+ if (len < 0 || len > key->keyblob_len - pos - 4)
goto done; /* key is far too short */
- len = GET_32BIT(key->keyblob + pos); /* find cipher-type length */
- if (key->keyblob_len < pos+4+len)
+ pos += 4 + len; /* skip key type */
+ len = toint(GET_32BIT(key->keyblob + pos)); /* find cipher-type length */
+ if (len < 0 || len > key->keyblob_len - pos - 4)
goto done; /* cipher type string is incomplete */
if (len != 4 || 0 != memcmp(key->keyblob + pos + 4, "none", 4))
answer = 1;
static int sshcom_read_mpint(void *data, int len, struct mpint_pos *ret)
{
- int bits;
- int bytes;
+ unsigned bits, bytes;
unsigned char *d = (unsigned char *) data;
if (len < 4)
*/
pos = 8;
if (key->keyblob_len < pos+4 ||
- (len = GET_32BIT(key->keyblob + pos)) > key->keyblob_len - pos - 4) {
+ (len = toint(GET_32BIT(key->keyblob + pos))) < 0 ||
+ len > key->keyblob_len - pos - 4) {
errmsg = "key blob does not contain a key type string";
goto error;
}
* Determine the cipher type.
*/
if (key->keyblob_len < pos+4 ||
- (len = GET_32BIT(key->keyblob + pos)) > key->keyblob_len - pos - 4) {
+ (len = toint(GET_32BIT(key->keyblob + pos))) < 0 ||
+ len > key->keyblob_len - pos - 4) {
errmsg = "key blob does not contain a cipher type string";
goto error;
}
* Get hold of the encrypted part of the key.
*/
if (key->keyblob_len < pos+4 ||
- (len = GET_32BIT(key->keyblob + pos)) > key->keyblob_len - pos - 4) {
+ (len = toint(GET_32BIT(key->keyblob + pos))) < 0 ||
+ len > key->keyblob_len - pos - 4) {
errmsg = "key blob does not contain actual key data";
goto error;
}
/*
* Strip away the containing string to get to the real meat.
*/
- len = GET_32BIT(ciphertext);
+ len = toint(GET_32BIT(ciphertext));
if (len < 0 || len > cipherlen-4) {
errmsg = "containing string was ill-formed";
goto error;
int pos;
struct mpint_pos n, e, d, p, q, iqmp;
+ /*
+ * These blobs were generated from inside PuTTY, so we needn't
+ * treat them as untrusted.
+ */
pos = 4 + GET_32BIT(pubblob);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &e);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &n);
int pos;
struct mpint_pos p, q, g, y, x;
+ /*
+ * These blobs were generated from inside PuTTY, so we needn't
+ * treat them as untrusted.
+ */
pos = 4 + GET_32BIT(pubblob);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &p);
pos += ssh2_read_mpint(pubblob+pos, publen-pos, &q);