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Merge branch 'bug4371_squashed'

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This commit is contained in:
Nick Mathewson 2011-11-15 15:58:00 -05:00
commit c4a4ac7de6
4 changed files with 43 additions and 30 deletions
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3
changes/bug4371 Normal file
View File

@ -0,0 +1,3 @@
o Minor bugfixes:
- Tolerate servers with more clock skew than previously. Fixes bug 4371;
bugfix on 0.2.3.6-alpha.

49
src/common/tortls.c
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@ -212,7 +212,8 @@ static int tor_tls_context_init_one(tor_tls_context_t **ppcontext,
static tor_tls_context_t *tor_tls_context_new(crypto_pk_env_t *identity, static tor_tls_context_t *tor_tls_context_new(crypto_pk_env_t *identity,
unsigned int key_lifetime, unsigned int key_lifetime,
int is_client); int is_client);
static int check_cert_lifetime_internal(const X509 *cert, int tolerance); static int check_cert_lifetime_internal(int severity, const X509 *cert,
int past_tolerance, int future_tolerance);
/** Global TLS contexts. We keep them here because nobody else needs /** Global TLS contexts. We keep them here because nobody else needs
* to touch them. */ * to touch them. */
@ -944,7 +945,8 @@ tor_tls_cert_matches_key(const tor_tls_t *tls, const tor_cert_t *cert)
* the key is long enough. Return 1 if the cert is good, and 0 if it's bad or * the key is long enough. Return 1 if the cert is good, and 0 if it's bad or
* we couldn't check it. */ * we couldn't check it. */
int int
tor_tls_cert_is_valid(const tor_cert_t *cert, tor_tls_cert_is_valid(int severity,
const tor_cert_t *cert,
const tor_cert_t *signing_cert, const tor_cert_t *signing_cert,
int check_rsa_1024) int check_rsa_1024)
{ {
@ -960,8 +962,8 @@ tor_tls_cert_is_valid(const tor_cert_t *cert,
/* okay, the signature checked out right. Now let's check the check the /* okay, the signature checked out right. Now let's check the check the
* lifetime. */ * lifetime. */
/*XXXX tolerance might be iffy here */ if (check_cert_lifetime_internal(severity, cert->cert,
if (check_cert_lifetime_internal(cert->cert, 60*60) < 0) 48*60*60, 30*24*60*60) < 0)
return 0; return 0;
cert_key = X509_get_pubkey(cert->cert); cert_key = X509_get_pubkey(cert->cert);
@ -1924,7 +1926,7 @@ tor_tls_get_peer_cert(tor_tls_t *tls)
/** Warn that a certificate lifetime extends through a certain range. */ /** Warn that a certificate lifetime extends through a certain range. */
static void static void
log_cert_lifetime(const X509 *cert, const char *problem) log_cert_lifetime(int severity, const X509 *cert, const char *problem)
{ {
BIO *bio = NULL; BIO *bio = NULL;
BUF_MEM *buf; BUF_MEM *buf;
@ -1934,8 +1936,9 @@ log_cert_lifetime(const X509 *cert, const char *problem)
struct tm tm; struct tm tm;
if (problem) if (problem)
log_warn(LD_GENERAL, log(severity, LD_GENERAL,
"Certificate %s: is your system clock set incorrectly?", "Certificate %s. Either their clock is set wrong, or your clock "
"is wrong.",
problem); problem);
if (!(bio = BIO_new(BIO_s_mem()))) { if (!(bio = BIO_new(BIO_s_mem()))) {
@ -1958,7 +1961,7 @@ log_cert_lifetime(const X509 *cert, const char *problem)
strftime(mytime, 32, "%b %d %H:%M:%S %Y GMT", tor_gmtime_r(&now, &tm)); strftime(mytime, 32, "%b %d %H:%M:%S %Y GMT", tor_gmtime_r(&now, &tm));
log_warn(LD_GENERAL, log(severity, LD_GENERAL,
"(certificate lifetime runs from %s through %s. Your time is %s.)", "(certificate lifetime runs from %s through %s. Your time is %s.)",
s1,s2,mytime); s1,s2,mytime);
@ -2062,14 +2065,15 @@ tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity_key)
return r; return r;
} }
/** Check whether the certificate set on the connection <b>tls</b> is /** Check whether the certificate set on the connection <b>tls</b> is expired
* expired or not-yet-valid, give or take <b>tolerance</b> * give or take <b>past_tolerance</b> seconds, or not-yet-valid give or take
* seconds. Return 0 for valid, -1 for failure. * <b>future_tolerance</b> seconds. Return 0 for valid, -1 for failure.
* *
* NOTE: you should call tor_tls_verify before tor_tls_check_lifetime. * NOTE: you should call tor_tls_verify before tor_tls_check_lifetime.
*/ */
int int
tor_tls_check_lifetime(tor_tls_t *tls, int tolerance) tor_tls_check_lifetime(int severity, tor_tls_t *tls,
int past_tolerance, int future_tolerance)
{ {
X509 *cert; X509 *cert;
int r = -1; int r = -1;
@ -2077,7 +2081,8 @@ tor_tls_check_lifetime(tor_tls_t *tls, int tolerance)
if (!(cert = SSL_get_peer_certificate(tls->ssl))) if (!(cert = SSL_get_peer_certificate(tls->ssl)))
goto done; goto done;
if (check_cert_lifetime_internal(cert, tolerance) < 0) if (check_cert_lifetime_internal(severity, cert,
past_tolerance, future_tolerance) < 0)
goto done; goto done;
r = 0; r = 0;
@ -2090,24 +2095,26 @@ tor_tls_check_lifetime(tor_tls_t *tls, int tolerance)
return r; return r;
} }
/** Helper: check whether <b>cert</b> is currently live, give or take /** Helper: check whether <b>cert</b> is expired give or take
* <b>tolerance</b> seconds. If it is live, return 0. If it is not live, * <b>past_tolerance</b> seconds, or not-yet-valid give or take
* log a message and return -1. */ * <b>future_tolerance</b> seconds. If it is live, return 0. If it is not
* live, log a message and return -1. */
static int static int
check_cert_lifetime_internal(const X509 *cert, int tolerance) check_cert_lifetime_internal(int severity, const X509 *cert, int past_tolerance,
int future_tolerance)
{ {
time_t now, t; time_t now, t;
now = time(NULL); now = time(NULL);
t = now + tolerance; t = now + future_tolerance;
if (X509_cmp_time(X509_get_notBefore(cert), &t) > 0) { if (X509_cmp_time(X509_get_notBefore(cert), &t) > 0) {
log_cert_lifetime(cert, "not yet valid"); log_cert_lifetime(severity, cert, "not yet valid");
return -1; return -1;
} }
t = now - tolerance; t = now - past_tolerance;
if (X509_cmp_time(X509_get_notAfter(cert), &t) < 0) { if (X509_cmp_time(X509_get_notAfter(cert), &t) < 0) {
log_cert_lifetime(cert, "already expired"); log_cert_lifetime(severity, cert, "already expired");
return -1; return -1;
} }

7
src/common/tortls.h
View File

@ -68,7 +68,9 @@ void tor_tls_free(tor_tls_t *tls);
int tor_tls_peer_has_cert(tor_tls_t *tls); int tor_tls_peer_has_cert(tor_tls_t *tls);
tor_cert_t *tor_tls_get_peer_cert(tor_tls_t *tls); tor_cert_t *tor_tls_get_peer_cert(tor_tls_t *tls);
int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity); int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_env_t **identity);
int tor_tls_check_lifetime(tor_tls_t *tls, int tolerance); int tor_tls_check_lifetime(int severity,
tor_tls_t *tls, int past_tolerance,
int future_tolerance);
int tor_tls_read(tor_tls_t *tls, char *cp, size_t len); int tor_tls_read(tor_tls_t *tls, char *cp, size_t len);
int tor_tls_write(tor_tls_t *tls, const char *cp, size_t n); int tor_tls_write(tor_tls_t *tls, const char *cp, size_t n);
int tor_tls_handshake(tor_tls_t *tls); int tor_tls_handshake(tor_tls_t *tls);
@ -123,7 +125,8 @@ int tor_tls_get_my_certs(int server,
crypto_pk_env_t *tor_tls_get_my_client_auth_key(void); crypto_pk_env_t *tor_tls_get_my_client_auth_key(void);
crypto_pk_env_t *tor_tls_cert_get_key(tor_cert_t *cert); crypto_pk_env_t *tor_tls_cert_get_key(tor_cert_t *cert);
int tor_tls_cert_matches_key(const tor_tls_t *tls, const tor_cert_t *cert); int tor_tls_cert_matches_key(const tor_tls_t *tls, const tor_cert_t *cert);
int tor_tls_cert_is_valid(const tor_cert_t *cert, int tor_tls_cert_is_valid(int severity,
const tor_cert_t *cert,
const tor_cert_t *signing_cert, const tor_cert_t *signing_cert,
int check_rsa_1024); int check_rsa_1024);

8
src/or/command.c
View File

@ -991,9 +991,9 @@ command_process_cert_cell(var_cell_t *cell, or_connection_t *conn)
if (! tor_tls_cert_matches_key(conn->tls, link_cert)) { if (! tor_tls_cert_matches_key(conn->tls, link_cert)) {
ERR("The link certificate didn't match the TLS public key"); ERR("The link certificate didn't match the TLS public key");
} }
if (! tor_tls_cert_is_valid(link_cert, id_cert, 0)) if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, link_cert, id_cert, 0))
ERR("The link certificate was not valid"); ERR("The link certificate was not valid");
if (! tor_tls_cert_is_valid(id_cert, id_cert, 1)) if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1))
ERR("The ID certificate was not valid"); ERR("The ID certificate was not valid");
conn->handshake_state->authenticated = 1; conn->handshake_state->authenticated = 1;
@ -1026,9 +1026,9 @@ command_process_cert_cell(var_cell_t *cell, or_connection_t *conn)
ERR("The certs we wanted were missing"); ERR("The certs we wanted were missing");
/* Remember these certificates so we can check an AUTHENTICATE cell */ /* Remember these certificates so we can check an AUTHENTICATE cell */
if (! tor_tls_cert_is_valid(auth_cert, id_cert, 1)) if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, auth_cert, id_cert, 1))
ERR("The authentication certificate was not valid"); ERR("The authentication certificate was not valid");
if (! tor_tls_cert_is_valid(id_cert, id_cert, 1)) if (! tor_tls_cert_is_valid(LOG_PROTOCOL_WARN, id_cert, id_cert, 1))
ERR("The ID certificate was not valid"); ERR("The ID certificate was not valid");
log_info(LD_OR, "Got some good certificates from %s:%d: " log_info(LD_OR, "Got some good certificates from %s:%d: "