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start part-way through the ssl cert lifetime

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also, snap the start time and end time to a day boundary, since most
certs in the wild seem to do this.
This commit is contained in:
Roger Dingledine 2013-03-10 16:28:28 -04:00
parent edd6f02273
commit 0196647970
2 changed files with 23 additions and 7 deletions
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16
src/common/tortls.c
View File

@ -234,7 +234,7 @@ static X509* tor_tls_create_certificate(crypto_pk_t *rsa,
crypto_pk_t *rsa_sign,
const char *cname,
const char *cname_sign,
unsigned int lifetime);
unsigned int cert_lifetime);
static int tor_tls_context_init_one(tor_tls_context_t **ppcontext,
crypto_pk_t *identity,
@ -608,9 +608,10 @@ tor_x509_name_new(const char *cname)
/** Generate and sign an X509 certificate with the public key <b>rsa</b>,
* signed by the private key <b>rsa_sign</b>. The commonName of the
* certificate will be <b>cname</b>; the commonName of the issuer will be
* <b>cname_sign</b>. The cert will be valid for <b>cert_lifetime</b> seconds
* starting from now. Return a certificate on success, NULL on
* failure.
* <b>cname_sign</b>. The cert will be valid for <b>cert_lifetime</b>
* seconds, starting from some time in the past.
*
* Return a certificate on success, NULL on failure.
*/
static X509 *
tor_tls_create_certificate(crypto_pk_t *rsa,
@ -632,7 +633,12 @@ tor_tls_create_certificate(crypto_pk_t *rsa,
tor_tls_init();
start_time = time(NULL);
/* Make sure we're part-way through the certificate lifetime, rather
* than having it start right now. Don't choose quite uniformly, since
* then we might pick a time where we're about to expire. Lastly, be
* sure to start on a day boundary. */
start_time = time(NULL) - crypto_rand_int(cert_lifetime) + 2*24*3600;
start_time -= start_time % (24*3600);
tor_assert(rsa);
tor_assert(cname);

14
src/or/router.c
View File

@ -660,8 +660,18 @@ router_initialize_tls_context(void)
flags |= TOR_TLS_CTX_USE_ECDHE_P224;
}
if (!lifetime) { /* we should guess a good ssl cert lifetime */
/* choose between 1 and 365 days */
lifetime = 1*24*3600 + crypto_rand_int(364*24*3600);
/* choose between 5 and 365 days, and round to the day */
lifetime = 5*24*3600 + crypto_rand_int(361*24*3600);
lifetime -= lifetime % (24*3600);
if (crypto_rand_int(2)) {
/* Half the time we expire at midnight, and half the time we expire
* one second before midnight. (Some CAs wobble their expiry times a
* bit in practice, perhaps to reduce collision attacks; see ticket
* 8443 for details about observed certs in the wild.) */
lifetime--;
}
}
/* It's ok to pass lifetime in as an unsigned int, since