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Merge branch 'bug4371_squashed'
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commit
c4a4ac7de6
3
changes/bug4371
Normal file
3
changes/bug4371
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@ -0,0 +1,3 @@
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o Minor bugfixes:
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- Tolerate servers with more clock skew than previously. Fixes bug 4371;
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bugfix on 0.2.3.6-alpha.
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@ -212,7 +212,8 @@ static int tor_tls_context_init_one(tor_tls_context_t **ppcontext,
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static tor_tls_context_t *tor_tls_context_new(crypto_pk_env_t *identity,
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unsigned int key_lifetime,
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int is_client);
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static int check_cert_lifetime_internal(const X509 *cert, int tolerance);
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static int check_cert_lifetime_internal(int severity, const X509 *cert,
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int past_tolerance, int future_tolerance);
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/** Global TLS contexts. We keep them here because nobody else needs
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* to touch them. */
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@ -944,7 +945,8 @@ tor_tls_cert_matches_key(const tor_tls_t *tls, const tor_cert_t *cert)
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* the key is long enough. Return 1 if the cert is good, and 0 if it's bad or
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* we couldn't check it. */
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int
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tor_tls_cert_is_valid(const tor_cert_t *cert,
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tor_tls_cert_is_valid(int severity,
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const tor_cert_t *cert,
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const tor_cert_t *signing_cert,
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int check_rsa_1024)
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{
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@ -960,8 +962,8 @@ tor_tls_cert_is_valid(const tor_cert_t *cert,
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/* okay, the signature checked out right. Now let's check the check the
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* lifetime. */
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/*XXXX tolerance might be iffy here */
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if (check_cert_lifetime_internal(cert->cert, 60*60) < 0)
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if (check_cert_lifetime_internal(severity, cert->cert,
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48*60*60, 30*24*60*60) < 0)
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return 0;
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cert_key = X509_get_pubkey(cert->cert);
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@ -1924,7 +1926,7 @@ tor_tls_get_peer_cert(tor_tls_t *tls)
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/** Warn that a certificate lifetime extends through a certain range. */
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static void
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log_cert_lifetime(const X509 *cert, const char *problem)
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log_cert_lifetime(int severity, const X509 *cert, const char *problem)
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{
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BIO *bio = NULL;
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BUF_MEM *buf;
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@ -1934,8 +1936,9 @@ log_cert_lifetime(const X509 *cert, const char *problem)
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struct tm tm;
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if (problem)
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log_warn(LD_GENERAL,
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"Certificate %s: is your system clock set incorrectly?",
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log(severity, LD_GENERAL,
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"Certificate %s. Either their clock is set wrong, or your clock "
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"is wrong.",
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problem);
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if (!(bio = BIO_new(BIO_s_mem()))) {
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@ -1958,7 +1961,7 @@ log_cert_lifetime(const X509 *cert, const char *problem)
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strftime(mytime, 32, "%b %d %H:%M:%S %Y GMT", tor_gmtime_r(&now, &tm));
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log_warn(LD_GENERAL,
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log(severity, LD_GENERAL,
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"(certificate lifetime runs from %s through %s. Your time is %s.)",
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s1,s2,mytime);
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@ -2062,14 +2065,15 @@ tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity_key)
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return r;
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}
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/** Check whether the certificate set on the connection <b>tls</b> is
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* expired or not-yet-valid, give or take <b>tolerance</b>
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* seconds. Return 0 for valid, -1 for failure.
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/** Check whether the certificate set on the connection <b>tls</b> is expired
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* give or take <b>past_tolerance</b> seconds, or not-yet-valid give or take
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* <b>future_tolerance</b> seconds. Return 0 for valid, -1 for failure.
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*
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* NOTE: you should call tor_tls_verify before tor_tls_check_lifetime.
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*/
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int
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tor_tls_check_lifetime(tor_tls_t *tls, int tolerance)
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tor_tls_check_lifetime(int severity, tor_tls_t *tls,
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int past_tolerance, int future_tolerance)
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{
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X509 *cert;
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int r = -1;
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@ -2077,7 +2081,8 @@ tor_tls_check_lifetime(tor_tls_t *tls, int tolerance)
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if (!(cert = SSL_get_peer_certificate(tls->ssl)))
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goto done;
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if (check_cert_lifetime_internal(cert, tolerance) < 0)
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if (check_cert_lifetime_internal(severity, cert,
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past_tolerance, future_tolerance) < 0)
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goto done;
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r = 0;
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@ -2090,24 +2095,26 @@ tor_tls_check_lifetime(tor_tls_t *tls, int tolerance)
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return r;
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}
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/** Helper: check whether <b>cert</b> is currently live, give or take
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* <b>tolerance</b> seconds. If it is live, return 0. If it is not live,
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* log a message and return -1. */
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/** Helper: check whether <b>cert</b> is expired give or take
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* <b>past_tolerance</b> seconds, or not-yet-valid give or take
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* <b>future_tolerance</b> seconds. If it is live, return 0. If it is not
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* live, log a message and return -1. */
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static int
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check_cert_lifetime_internal(const X509 *cert, int tolerance)
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check_cert_lifetime_internal(int severity, const X509 *cert, int past_tolerance,
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int future_tolerance)
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{
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time_t now, t;
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now = time(NULL);
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t = now + tolerance;
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t = now + future_tolerance;
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if (X509_cmp_time(X509_get_notBefore(cert), &t) > 0) {
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log_cert_lifetime(cert, "not yet valid");
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log_cert_lifetime(severity, cert, "not yet valid");
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return -1;
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}
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t = now - tolerance;
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t = now - past_tolerance;
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if (X509_cmp_time(X509_get_notAfter(cert), &t) < 0) {
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log_cert_lifetime(cert, "already expired");
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log_cert_lifetime(severity, cert, "already expired");
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return -1;
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}
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@ -68,7 +68,9 @@ void tor_tls_free(tor_tls_t *tls);
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int tor_tls_peer_has_cert(tor_tls_t *tls);
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tor_cert_t *tor_tls_get_peer_cert(tor_tls_t *tls);
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int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity);
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int tor_tls_check_lifetime(tor_tls_t *tls, int tolerance);
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int tor_tls_check_lifetime(int severity,
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tor_tls_t *tls, int past_tolerance,
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int future_tolerance);
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int tor_tls_read(tor_tls_t *tls, char *cp, size_t len);
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int tor_tls_write(tor_tls_t *tls, const char *cp, size_t n);
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int tor_tls_handshake(tor_tls_t *tls);
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@ -123,7 +125,8 @@ int tor_tls_get_my_certs(int server,
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crypto_pk_env_t *tor_tls_get_my_client_auth_key(void);
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crypto_pk_env_t *tor_tls_cert_get_key(tor_cert_t *cert);
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int tor_tls_cert_matches_key(const tor_tls_t *tls, const tor_cert_t *cert);
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int tor_tls_cert_is_valid(const tor_cert_t *cert,
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int tor_tls_cert_is_valid(int severity,
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const tor_cert_t *cert,
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const tor_cert_t *signing_cert,
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int check_rsa_1024);
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@ -991,9 +991,9 @@ command_process_cert_cell(var_cell_t *cell, or_connection_t *conn)
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if (! tor_tls_cert_matches_key(conn->tls, link_cert)) {
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ERR("The link certificate didn't match the TLS public key");
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}
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if (! tor_tls_cert_is_valid(link_cert, id_cert, 0))
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if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, link_cert, id_cert, 0))
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ERR("The link certificate was not valid");
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if (! tor_tls_cert_is_valid(id_cert, id_cert, 1))
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if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1))
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ERR("The ID certificate was not valid");
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conn->handshake_state->authenticated = 1;
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@ -1026,9 +1026,9 @@ command_process_cert_cell(var_cell_t *cell, or_connection_t *conn)
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ERR("The certs we wanted were missing");
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/* Remember these certificates so we can check an AUTHENTICATE cell */
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if (! tor_tls_cert_is_valid(auth_cert, id_cert, 1))
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if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, 1))
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ERR("The authentication certificate was not valid");
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if (! tor_tls_cert_is_valid(id_cert, id_cert, 1))
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if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1))
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ERR("The ID certificate was not valid");
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log_info(LD_OR, "Got some good certificates from %s:%d: "
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