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Use random bytes as our certificate serial numbers.

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Instead of using time(NULL) in our certificate serial numbers, use
eight random bytes as suggested in proposal 179.
This commit is contained in:
George Kadianakis 2011-11-27 08:20:17 +01:00
parent 58d1aa4402
commit b42ff6545a
1 changed files with 16 additions and 1 deletions
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17
src/common/tortls.c
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@ -585,7 +585,11 @@ tor_tls_create_certificate(crypto_pk_env_t *rsa,
const char *cname_sign,
unsigned int cert_lifetime)
{
#define SERIAL_NUMBER_SIZE 8
time_t start_time, end_time;
BIGNUM *serial_number = NULL;
unsigned char serial_tmp[SERIAL_NUMBER_SIZE];
EVP_PKEY *sign_pkey = NULL, *pkey=NULL;
X509 *x509 = NULL;
X509_NAME *name = NULL, *name_issuer=NULL;
@ -606,8 +610,15 @@ tor_tls_create_certificate(crypto_pk_env_t *rsa,
goto error;
if (!(X509_set_version(x509, 2)))
goto error;
if (!(ASN1_INTEGER_set(X509_get_serialNumber(x509), (long)start_time)))
{ /* our serial number is 8 random bytes. */
if (crypto_rand((char *)serial_tmp, sizeof(serial_tmp)) < 0)
goto error;
if (!(serial_number = BN_bin2bn(serial_tmp, sizeof(serial_tmp), NULL)))
goto error;
if (!(BN_to_ASN1_INTEGER(serial_number, X509_get_serialNumber(x509))))
goto error;
}
if (!(name = tor_x509_name_new(cname)))
goto error;
@ -640,11 +651,15 @@ tor_tls_create_certificate(crypto_pk_env_t *rsa,
EVP_PKEY_free(sign_pkey);
if (pkey)
EVP_PKEY_free(pkey);
if (serial_number)
BN_free(serial_number);
if (name)
X509_NAME_free(name);
if (name_issuer)
X509_NAME_free(name_issuer);
return x509;
#undef SERIAL_NUMBER_SIZE
}
/** List of ciphers that servers should select from.*/