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Initial NSS support for TLS.

Browse Source 
This is enough to get a chutney network to bootstrap, though a bunch
of work remains.
This commit is contained in:
Nick Mathewson 2018-08-17 11:24:50 -04:00
parent c567b8fcb4
commit 5205c7fd90
7 changed files with 656 additions and 306 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
src/lib/tls/tortls.c
View File

@ -4,6 +4,7 @@
/* See LICENSE for licensing information */
#define TORTLS_PRIVATE
#define TOR_X509_PRIVATE
#include "lib/tls/x509.h"
#include "lib/tls/x509_internal.h"
#include "lib/tls/tortls.h"
@ -14,6 +15,8 @@
#include "lib/crypt_ops/crypto_rsa.h"
#include "lib/crypt_ops/crypto_rand.h"
#include <time.h>
/** Global TLS contexts. We keep them here because nobody else needs
* to touch them.
*
@ -31,6 +34,26 @@ tor_tls_context_get(int is_server)
return is_server ? server_tls_context : client_tls_context;
}
/** Convert an errno (or a WSAerrno on windows) into a TOR_TLS_* error
* code. */
int
tor_errno_to_tls_error(int e)
{
switch (e) {
case SOCK_ERRNO(ECONNRESET): // most common
return TOR_TLS_ERROR_CONNRESET;
case SOCK_ERRNO(ETIMEDOUT):
return TOR_TLS_ERROR_TIMEOUT;
case SOCK_ERRNO(EHOSTUNREACH):
case SOCK_ERRNO(ENETUNREACH):
return TOR_TLS_ERROR_NO_ROUTE;
case SOCK_ERRNO(ECONNREFUSED):
return TOR_TLS_ERROR_CONNREFUSED; // least common
default:
return TOR_TLS_ERROR_MISC;
}
}
/** Set *<b>link_cert_out</b> and *<b>id_cert_out</b> to the link certificate
* and ID certificate that we're currently using for our V3 in-protocol
* handshake's certificate chain. If <b>server</b> is true, provide the certs
@ -334,3 +357,102 @@ tor_tls_is_server(tor_tls_t *tls)
tor_assert(tls);
return tls->isServer;
}
/** Release resources associated with a TLS object. Does not close the
* underlying file descriptor.
*/
void
tor_tls_free_(tor_tls_t *tls)
{
if (!tls)
return;
tor_assert(tls->ssl);
{
size_t r,w;
tor_tls_get_n_raw_bytes(tls,&r,&w); /* ensure written_by_tls is updated */
}
tor_tls_impl_free_(tls->ssl);
tls->ssl = NULL;
#ifdef ENABLE_OPENSSL
tls->negotiated_callback = NULL;
#endif
if (tls->context)
tor_tls_context_decref(tls->context);
tor_free(tls->address);
tls->magic = 0x99999999;
tor_free(tls);
}
/** If the provided tls connection is authenticated and has a
* certificate chain that is currently valid and signed, then set
* *<b>identity_key</b> to the identity certificate's key and return
* 0. Else, return -1 and log complaints with log-level <b>severity</b>.
*/
int
tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity)
{
tor_x509_cert_impl_t *cert = NULL, *id_cert = NULL;
tor_x509_cert_t *peer_x509 = NULL, *id_x509 = NULL;
tor_assert(tls);
tor_assert(identity);
int rv = -1;
try_to_extract_certs_from_tls(severity, tls, &cert, &id_cert);
if (!cert)
goto done;
if (!id_cert) {
log_fn(severity,LD_PROTOCOL,"No distinct identity certificate found");
goto done;
}
peer_x509 = tor_x509_cert_new(cert);
id_x509 = tor_x509_cert_new(id_cert);
cert = id_cert = NULL; /* Prevent double-free */
if (! tor_tls_cert_is_valid(severity, peer_x509, id_x509, time(NULL), 0)) {
goto done;
}
*identity = tor_tls_cert_get_key(id_x509);
rv = 0;
done:
if (cert)
tor_x509_cert_impl_free_(cert);
if (id_cert)
tor_x509_cert_impl_free_(id_cert);
tor_x509_cert_free(peer_x509);
tor_x509_cert_free(id_x509);
return rv;
}
/** Check whether the certificate set on the connection <b>tls</b> is expired
* give or take <b>past_tolerance</b> seconds, or not-yet-valid give or take
* <b>future_tolerance</b> seconds. Return 0 for valid, -1 for failure.
*
* NOTE: you should call tor_tls_verify before tor_tls_check_lifetime.
*/
int
tor_tls_check_lifetime(int severity, tor_tls_t *tls,
time_t now,
int past_tolerance, int future_tolerance)
{
tor_x509_cert_t *cert;
int r = -1;
if (!(cert = tor_tls_get_peer_cert(tls)))
goto done;
if (tor_x509_check_cert_lifetime_internal(severity, cert->cert, now,
past_tolerance,
future_tolerance) < 0)
goto done;
r = 0;
done:
tor_x509_cert_free(cert);
/* Not expected to get invoked */
tls_log_errors(tls, LOG_WARN, LD_NET, "checking certificate lifetime");
return r;
}

23
src/lib/tls/tortls.h
View File

@ -13,10 +13,25 @@
#include "lib/crypt_ops/crypto_rsa.h"
#include "lib/testsupport/testsupport.h"
#include "lib/net/nettypes.h"
/* Opaque structure to hold a TLS connection. */
typedef struct tor_tls_t tor_tls_t;
#ifdef TORTLS_PRIVATE
#ifdef ENABLE_OPENSSL
struct ssl_st;
struct ssl_ctx_st;
struct ssl_session_st;
typedef struct ssl_ctx_st tor_tls_context_impl_t;
typedef struct ssl_st tor_tls_impl_t;
#else
struct PRFileDesc;
typedef struct PRFileDesc tor_tls_context_impl_t;
typedef struct PRFileDesc tor_tls_impl_t;
#endif
#endif
struct tor_x509_cert_t;
/* Possible return values for most tor_tls_* functions. */
@ -73,7 +88,7 @@ int tor_tls_context_init(unsigned flags,
void tor_tls_context_incref(tor_tls_context_t *ctx);
void tor_tls_context_decref(tor_tls_context_t *ctx);
tor_tls_context_t *tor_tls_context_get(int is_server);
tor_tls_t *tor_tls_new(int sock, int is_server);
tor_tls_t *tor_tls_new(tor_socket_t sock, int is_server);
void tor_tls_set_logged_address(tor_tls_t *tls, const char *address);
void tor_tls_set_renegotiate_callback(tor_tls_t *tls,
void (*cb)(tor_tls_t *, void *arg),
@ -121,13 +136,17 @@ MOCK_DECL(int,tor_tls_export_key_material,(
size_t context_len,
const char *label));
#ifdef ENABLE_OPENSSL
/* Log and abort if there are unhandled TLS errors in OpenSSL's error stack.
*/
#define check_no_tls_errors() check_no_tls_errors_(__FILE__,__LINE__)
void check_no_tls_errors_(const char *fname, int line);
void tor_tls_log_one_error(tor_tls_t *tls, unsigned long err,
int severity, int domain, const char *doing);
#else
#define check_no_tls_errors() STMT_NIL
#endif
int tor_tls_get_my_certs(int server,
const struct tor_x509_cert_t **link_cert_out,

16
src/lib/tls/tortls_internal.h
View File

@ -6,15 +6,11 @@
#ifndef TORTLS_INTERNAL_H
#define TORTLS_INTERNAL_H
#ifdef ENABLE_OPENSSL
struct ssl_st;
struct ssl_ctx_st;
struct ssl_session_st;
#endif
int tor_errno_to_tls_error(int e);
#ifdef ENABLE_OPENSSL
int tor_tls_get_error(tor_tls_t *tls, int r, int extra,
const char *doing, int severity, int domain);
#endif
MOCK_DECL(void, try_to_extract_certs_from_tls,
(int severity, tor_tls_t *tls,
tor_x509_cert_impl_t **cert_out,
@ -31,13 +27,9 @@ int tor_tls_context_init_certificates(tor_tls_context_t *result,
crypto_pk_t *identity,
unsigned key_lifetime,
unsigned flags);
void tor_tls_impl_free_(tor_tls_impl_t *ssl);
#ifdef ENABLE_OPENSSL
void tor_tls_context_impl_free(struct ssl_ctx_st *);
#else
struct ssl_ctx_st; // XXXX replace
void tor_tls_context_impl_free(struct ssl_ctx_st *);
#endif
void tor_tls_context_impl_free(tor_tls_context_impl_t *);
#ifdef ENABLE_OPENSSL
tor_tls_t *tor_tls_get_by_ssl(const struct ssl_st *ssl);

621
src/lib/tls/tortls_nss.c
View File

@ -12,6 +12,7 @@
#include "orconfig.h"
#define TORTLS_PRIVATE
#define TOR_X509_PRIVATE
#ifdef _WIN32 /*wrkard for dtls1.h >= 0.9.8m of "#include <winsock.h>"*/
#include <winsock2.h>
@ -22,6 +23,9 @@
#include "lib/crypt_ops/crypto_rand.h"
#include "lib/crypt_ops/crypto_dh.h"
#include "lib/crypt_ops/crypto_util.h"
#include "lib/crypt_ops/crypto_nss_mgt.h"
#include "lib/string/printf.h"
#include "lib/tls/x509.h"
#include "lib/tls/x509_internal.h"
#include "lib/tls/tortls.h"
@ -29,26 +33,16 @@
#include "lib/tls/tortls_internal.h"
#include "lib/log/util_bug.h"
int
tor_errno_to_tls_error(int e)
{
(void)e;
// XXXX
return -1;
}
int
tor_tls_get_error(tor_tls_t *tls, int r, int extra,
const char *doing, int severity, int domain)
{
(void)tls;
(void)r;
(void)extra;
(void)doing;
(void)severity;
(void)domain;
// XXXX
return -1;
}
#include <prio.h>
// For access to raw sockets.
#include <private/pprio.h>
#include <ssl.h>
#include <sslt.h>
#include <sslproto.h>
#include <certt.h>
static SECStatus always_accept_cert_cb(void *, PRFileDesc *, PRBool, PRBool);
MOCK_IMPL(void,
try_to_extract_certs_from_tls,(int severity, tor_tls_t *tls,
tor_x509_cert_impl_t **cert_out,
@ -57,14 +51,109 @@ try_to_extract_certs_from_tls,(int severity, tor_tls_t *tls,
tor_assert(tls);
tor_assert(cert_out);
tor_assert(id_cert_out);
(void)severity;
// XXXX
(void) severity;
*cert_out = *id_cert_out = NULL;
CERTCertificate *peer = SSL_PeerCertificate(tls->ssl);
if (!peer)
return;
*cert_out = peer; /* Now owns pointer. */
CERTCertList *chain = SSL_PeerCertificateChain(tls->ssl);
CERTCertListNode *c = CERT_LIST_HEAD(chain);
for (; !CERT_LIST_END(c, chain); c = CERT_LIST_NEXT(c)) {
if (CERT_CompareCerts(c->cert, peer) == PR_FALSE) {
*id_cert_out = CERT_DupCertificate(c->cert);
break;
}
}
CERT_DestroyCertList(chain);
}
static bool
we_like_ssl_cipher(SSLCipherAlgorithm ca)
{
switch (ca) {
case ssl_calg_null: return false;
case ssl_calg_rc4: return false;
case ssl_calg_rc2: return false;
case ssl_calg_des: return false;
case ssl_calg_3des: return false; /* ???? */
case ssl_calg_idea: return false;
case ssl_calg_fortezza: return false;
case ssl_calg_camellia: return false;
case ssl_calg_seed: return false;
case ssl_calg_aes: return true;
case ssl_calg_aes_gcm: return true;
case ssl_calg_chacha20: return true;
default: return true;
}
}
static bool
we_like_ssl_kea(SSLKEAType kt)
{
switch (kt) {
case ssl_kea_null: return false;
case ssl_kea_rsa: return false; /* ??? */
case ssl_kea_fortezza: return false;
case ssl_kea_ecdh_psk: return false;
case ssl_kea_dh_psk: return false;
case ssl_kea_dh: return true;
case ssl_kea_ecdh: return true;
case ssl_kea_tls13_any: return true;
case ssl_kea_size: return true; /* prevent a warning. */
default: return true;
}
}
static bool
we_like_mac_algorithm(SSLMACAlgorithm ma)
{
switch (ma) {
case ssl_mac_null: return false;
case ssl_mac_md5: return false;
case ssl_hmac_md5: return false;
case ssl_mac_sha: return true;
case ssl_hmac_sha: return true;
case ssl_hmac_sha256: return true;
case ssl_mac_aead: return true;
case ssl_hmac_sha384: return true;
default: return true;
}
}
static bool
we_like_auth_type(SSLAuthType at)
{
switch (at) {
case ssl_auth_null: return false;
case ssl_auth_rsa_decrypt: return false;
case ssl_auth_dsa: return false;
case ssl_auth_kea: return false;
case ssl_auth_ecdsa: return true;
case ssl_auth_ecdh_rsa: return true;
case ssl_auth_ecdh_ecdsa: return true;
case ssl_auth_rsa_sign: return true;
case ssl_auth_rsa_pss: return true;
case ssl_auth_psk: return true;
case ssl_auth_tls13_any: return true;
case ssl_auth_size: return true; /* prevent a warning. */
default: return true;
}
}
tor_tls_context_t *
tor_tls_context_new(crypto_pk_t *identity,
unsigned int key_lifetime, unsigned flags, int is_client)
{
SECStatus s;
tor_assert(identity);
tor_tls_context_t *ctx = tor_malloc_zero(sizeof(tor_tls_context_t));
@ -77,7 +166,128 @@ tor_tls_context_new(crypto_pk_t *identity,
}
}
// XXXX write the main body.
{
/* Create the "model" PRFileDesc that we will use to base others on. */
PRFileDesc *tcp = PR_NewTCPSocket();
if (!tcp)
goto err;
ctx->ctx = SSL_ImportFD(NULL, tcp);
if (!ctx->ctx) {
PR_Close(tcp);
goto err;
}
}
// Configure the certificate.
if (!is_client) {
s = SSL_ConfigServerCert(ctx->ctx,
ctx->my_link_cert->cert,
(SECKEYPrivateKey *)
crypto_pk_get_nss_privkey(ctx->link_key),
NULL, /* ExtraServerCertData */
0 /* DataLen */);
if (s != SECSuccess)
goto err;
}
// We need a certificate from the other side.
if (is_client) {
// XXXX does this do anything?
s = SSL_OptionSet(ctx->ctx, SSL_REQUIRE_CERTIFICATE, PR_TRUE);
if (s != SECSuccess)
goto err;
}
// Always accept other side's cert; we'll check it ourselves in goofy
// tor ways.
s = SSL_AuthCertificateHook(ctx->ctx, always_accept_cert_cb, NULL);
// We allow simultaneous read and write.
s = SSL_OptionSet(ctx->ctx, SSL_ENABLE_FDX, PR_TRUE);
if (s != SECSuccess)
goto err;
// XXXX SSL_ROLLBACK_DETECTION??
// XXXX SSL_ENABLE_ALPN??
// Force client-mode or server_mode.
s = SSL_OptionSet(ctx->ctx,
is_client ? SSL_HANDSHAKE_AS_CLIENT : SSL_HANDSHAKE_AS_SERVER,
PR_TRUE);
if (s != SECSuccess)
goto err;
// Disable everything before TLS 1.0; support everything else.
{
SSLVersionRange vrange;
memset(&vrange, 0, sizeof(vrange));
s = SSL_VersionRangeGetSupported(ssl_variant_stream, &vrange);
if (s != SECSuccess)
goto err;
if (vrange.min < SSL_LIBRARY_VERSION_TLS_1_0)
vrange.min = SSL_LIBRARY_VERSION_TLS_1_0;
s = SSL_VersionRangeSet(ctx->ctx, &vrange);
if (s != SECSuccess)
goto err;
}
// Only support strong ciphers.
{
const PRUint16 *ciphers = SSL_GetImplementedCiphers();
const PRUint16 n_ciphers = SSL_GetNumImplementedCiphers();
PRUint16 i;
for (i = 0; i < n_ciphers; ++i) {
SSLCipherSuiteInfo info;
memset(&info, 0, sizeof(info));
s = SSL_GetCipherSuiteInfo(ciphers[i], &info, sizeof(info));
if (s != SECSuccess)
goto err;
if (BUG(info.cipherSuite != ciphers[i]))
goto err;
int disable = info.effectiveKeyBits < 128 ||
info.macBits < 128 ||
!we_like_ssl_cipher(info.symCipher) ||
!we_like_ssl_kea(info.keaType) ||
!we_like_mac_algorithm(info.macAlgorithm) ||
!we_like_auth_type(info.authType)/* Requires NSS 3.24 */;
s = SSL_CipherPrefSet(ctx->ctx, ciphers[i],
disable ? PR_FALSE : PR_TRUE);
if (s != SECSuccess)
goto err;
}
}
// Only use DH and ECDH keys once.
s = SSL_OptionSet(ctx->ctx, SSL_REUSE_SERVER_ECDHE_KEY, PR_FALSE);
if (s != SECSuccess)
goto err;
// don't cache sessions.
s = SSL_OptionSet(ctx->ctx, SSL_NO_CACHE, PR_TRUE);
if (s != SECSuccess)
goto err;
// Enable DH.
s = SSL_OptionSet(ctx->ctx, SSL_ENABLE_SERVER_DHE, PR_TRUE);
if (s != SECSuccess)
goto err;
// Set DH and ECDH groups.
SSLNamedGroup groups[] = {
ssl_grp_ec_curve25519,
ssl_grp_ec_secp256r1,
ssl_grp_ec_secp224r1,
ssl_grp_ffdhe_2048,
};
s = SSL_NamedGroupConfig(ctx->ctx, groups, ARRAY_LENGTH(groups));
if (s != SECSuccess)
goto err;
// These features are off by default, so we don't need to disable them:
// Session tickets
// Renegotiation
// Compression
goto done;
err:
@ -88,11 +298,9 @@ tor_tls_context_new(crypto_pk_t *identity,
}
void
tor_tls_context_impl_free(struct ssl_ctx_st *ctx)
tor_tls_context_impl_free(tor_tls_context_impl_t *ctx)
{
(void)ctx;
// XXXX
// XXXX openssl type.
PR_Close(ctx);
}
void
@ -101,33 +309,82 @@ tor_tls_get_state_description(tor_tls_t *tls, char *buf, size_t sz)
(void)tls;
(void)buf;
(void)sz;
// XXXX
// AFAICT, NSS doesn't expose its internal state.
buf[0]=0;
}
void
tor_tls_init(void)
{
// XXXX
/* We don't have any global setup to do yet, but that will change */
}
void
tls_log_errors(tor_tls_t *tls, int severity, int domain,
const char *doing)
{
/* XXXX This implementation isn't right for NSS -- it logs the last error
whether anything actually failed or not. */
(void)tls;
(void)severity;
(void)domain;
(void)doing;
// XXXX
PRErrorCode code = PORT_GetError();
const char *string = PORT_ErrorToString(code);
const char *name = PORT_ErrorToName(code);
char buf[16];
if (!string)
string = "<unrecognized>";
if (!name) {
tor_snprintf(buf, sizeof(buf), "%d", code);
name = buf;
}
if (doing) {
log_fn(severity, domain, "TLS error %s while %s: %s", name, doing, string);
} else {
log_fn(severity, domain, "TLS error %s: %s", name, string);
}
}
tor_tls_t *
tor_tls_new(int sock, int is_server)
tor_tls_new(tor_socket_t sock, int is_server)
{
(void)sock;
(void)is_server;
// XXXX
return NULL;
tor_tls_context_t *ctx = tor_tls_context_get(is_server);
PRFileDesc *tcp = PR_ImportTCPSocket(sock);
if (!tcp)
return NULL;
PRFileDesc *ssl = SSL_ImportFD(ctx->ctx, tcp);
if (!ssl) {
PR_Close(tcp);
return NULL;
}
tor_tls_t *tls = tor_malloc_zero(sizeof(tor_tls_t));
tls->magic = TOR_TLS_MAGIC;
tls->context = ctx;
tor_tls_context_incref(ctx);
tls->ssl = ssl;
tls->socket = sock;
tls->state = TOR_TLS_ST_HANDSHAKE;
tls->isServer = !!is_server;
if (!is_server) {
/* Set a random SNI */
char *fake_hostname = crypto_random_hostname(4,25, "www.",".com");
SSL_SetURL(tls->ssl, fake_hostname);
tor_free(fake_hostname);
}
SECStatus s = SSL_ResetHandshake(ssl, is_server ? PR_TRUE : PR_FALSE);
if (s != SECSuccess) {
crypto_nss_log_errors(LOG_WARN, "resetting handshake state");
}
return tls;
}
void
tor_tls_set_renegotiate_callback(tor_tls_t *tls,
void (*cb)(tor_tls_t *, void *arg),
@ -136,131 +393,175 @@ tor_tls_set_renegotiate_callback(tor_tls_t *tls,
tor_assert(tls);
(void)cb;
(void)arg;
// XXXX;
/* We don't support renegotiation-based TLS with NSS. */
}
void
tor_tls_free_(tor_tls_t *tls)
tor_tls_impl_free_(tor_tls_impl_t *tls)
{
(void)tls;
// XXXX
// XXXX This will close the underlying fd, which our OpenSSL version does
// not do!
PR_Close(tls);
}
int
tor_tls_peer_has_cert(tor_tls_t *tls)
{
(void)tls;
// XXXX
return -1;
CERTCertificate *cert = SSL_PeerCertificate(tls->ssl);
int result = (cert != NULL);
CERT_DestroyCertificate(cert);
return result;
}
MOCK_IMPL(tor_x509_cert_t *,
tor_tls_get_peer_cert,(tor_tls_t *tls))
{
tor_assert(tls);
// XXXX
return NULL;
CERTCertificate *cert = SSL_PeerCertificate(tls->ssl);
if (cert)
return tor_x509_cert_new(cert);
else
return NULL;
}
MOCK_IMPL(tor_x509_cert_t *,
tor_tls_get_own_cert,(tor_tls_t *tls))
{
tor_assert(tls);
// XXXX
return NULL;
}
int
tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity)
{
tor_assert(tls);
tor_assert(identity);
(void)severity;
// XXXX
return -1;
}
int
tor_tls_check_lifetime(int severity,
tor_tls_t *tls, time_t now,
int past_tolerance,
int future_tolerance)
{
tor_assert(tls);
(void)severity;
(void)now;
(void)past_tolerance;
(void)future_tolerance;
// XXXX
return -1;
CERTCertificate *cert = SSL_LocalCertificate(tls->ssl);
if (cert)
return tor_x509_cert_new(cert);
else
return NULL;
}
MOCK_IMPL(int,
tor_tls_read, (tor_tls_t *tls, char *cp, size_t len))
{
tor_assert(tls);
tor_assert(cp);
(void)len;
// XXXX
return -1;
tor_assert(len < INT_MAX);
PRInt32 rv = PR_Read(tls->ssl, cp, (int)len);
// log_debug(LD_NET, "PR_Read(%zu) returned %d", n, (int)rv);
if (rv > 0) {
tls->n_read_since_last_check += rv;
return rv;
}
if (rv == 0)
return TOR_TLS_CLOSE;
PRErrorCode err = PORT_GetError();
if (err == PR_WOULD_BLOCK_ERROR) {
return TOR_TLS_WANTREAD; // XXXX ????
} else {
crypto_nss_log_errors(LOG_NOTICE, "reading"); // XXXX
return TOR_TLS_ERROR_MISC; // ????
}
}
int
tor_tls_write(tor_tls_t *tls, const char *cp, size_t n)
{
tor_assert(tls);
tor_assert(cp);
(void)n;
// XXXX
return -1;
tor_assert(cp || n == 0);
tor_assert(n < INT_MAX);
PRInt32 rv = PR_Write(tls->ssl, cp, (int)n);
// log_debug(LD_NET, "PR_Write(%zu) returned %d", n, (int)rv);
if (rv > 0) {
tls->n_written_since_last_check += rv;
return rv;
}
if (rv == 0)
return TOR_TLS_ERROR_MISC;
PRErrorCode err = PORT_GetError();
if (err == PR_WOULD_BLOCK_ERROR) {
return TOR_TLS_WANTWRITE; // XXXX ????
} else {
crypto_nss_log_errors(LOG_NOTICE, "writing"); // XXXX
return TOR_TLS_ERROR_MISC; // ????
}
}
int
tor_tls_handshake(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
tor_assert(tls->state == TOR_TLS_ST_HANDSHAKE);
SECStatus s = SSL_ForceHandshake(tls->ssl);
if (s == SECSuccess) {
tls->state = TOR_TLS_ST_OPEN;
log_debug(LD_NET, "SSL handshake is supposedly complete.");
return tor_tls_finish_handshake(tls);
}
if (PORT_GetError() == PR_WOULD_BLOCK_ERROR)
return TOR_TLS_WANTREAD; /* XXXX What about wantwrite? */
return TOR_TLS_ERROR_MISC; // XXXX
}
int
tor_tls_finish_handshake(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
// We don't need to do any of the weird handshake nonsense stuff on NSS,
// since we only support recent handshakes.
return TOR_TLS_DONE;
}
void
tor_tls_unblock_renegotiation(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
/* We don't support renegotiation with NSS. */
}
void
tor_tls_block_renegotiation(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
/* We don't support renegotiation with NSS. */
}
void
tor_tls_assert_renegotiation_unblocked(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
/* We don't support renegotiation with NSS. */
}
int
tor_tls_shutdown(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
/* XXXX This is not actually used, so I'm not implementing it. We can
* XXXX remove this function entirely someday. */
return -1;
}
int
tor_tls_get_pending_bytes(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
int n = SSL_DataPending(tls->ssl);
if (n < 0) {
crypto_nss_log_errors(LOG_WARN, "Looking up pending bytes");
return 0;
}
return (int)n;
}
size_t
tor_tls_get_forced_write_size(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
/* NSS doesn't have the same "forced write" restriction as openssl. */
return 0;
}
void
tor_tls_get_n_raw_bytes(tor_tls_t *tls,
size_t *n_read, size_t *n_written)
@ -268,7 +569,13 @@ tor_tls_get_n_raw_bytes(tor_tls_t *tls,
tor_assert(tls);
tor_assert(n_read);
tor_assert(n_written);
// XXXX
/* XXXX We don't curently have a way to measure this information correctly
* in NSS; we could do that with a PRIO layer, but it'll take a little
* coding. For now, we just track the number of bytes sent _in_ the TLS
* stream. Doing this will make our rate-limiting slightly inaccurate. */
*n_read = tls->n_read_since_last_check;
*n_written = tls->n_written_since_last_check;
tls->n_read_since_last_check = tls->n_written_since_last_check = 0;
}
int
@ -281,54 +588,70 @@ tor_tls_get_buffer_sizes(tor_tls_t *tls,
tor_assert(rbuf_bytes);
tor_assert(wbuf_capacity);
tor_assert(wbuf_bytes);
// XXXX
/* This is an acceptable way to say "we can't measure this." */
return -1;
}
MOCK_IMPL(double,
tls_get_write_overhead_ratio, (void))
{
// XXXX
return 0.0;
/* XXX We don't currently have a way to measure this in NSS; we could do that
* XXX with a PRIO layer, but it'll take a little coding. */
return 0.95;
}
int
tor_tls_used_v1_handshake(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
}
int
tor_tls_get_num_server_handshakes(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
/* We don't support or allow the V1 handshake with NSS.
*/
return 0;
}
int
tor_tls_server_got_renegotiate(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return -1;
return 0; /* We don't support renegotiation with NSS */
}
MOCK_IMPL(int,
tor_tls_cert_matches_key,(const tor_tls_t *tls,
const struct tor_x509_cert_t *cert))
{
tor_assert(tls);
tor_assert(cert);
// XXXX
return 0;
int rv = 0;
CERTCertificate *peercert = SSL_PeerCertificate(tls->ssl);
if (!peercert)
goto done;
CERTSubjectPublicKeyInfo *peer_info = &peercert->subjectPublicKeyInfo;
CERTSubjectPublicKeyInfo *cert_info = &cert->cert->subjectPublicKeyInfo;
rv = SECOID_CompareAlgorithmID(&peer_info->algorithm,
&cert_info->algorithm) == 0 &&
SECITEM_ItemsAreEqual(&peer_info->subjectPublicKey,
&cert_info->subjectPublicKey);
done:
if (peercert)
CERT_DestroyCertificate(peercert);
return rv;
}
MOCK_IMPL(int,
tor_tls_get_tlssecrets,(tor_tls_t *tls, uint8_t *secrets_out))
{
tor_assert(tls);
tor_assert(secrets_out);
// XXXX
/* There's no way to get this information out of NSS. */
return -1;
}
MOCK_IMPL(int,
tor_tls_export_key_material,(tor_tls_t *tls, uint8_t *secrets_out,
const uint8_t *context,
@ -339,42 +662,72 @@ tor_tls_export_key_material,(tor_tls_t *tls, uint8_t *secrets_out,
tor_assert(secrets_out);
tor_assert(context);
tor_assert(label);
(void)context_len;
// XXXX
return -1;
}
tor_assert(strlen(label) <= UINT_MAX);
tor_assert(context_len <= UINT_MAX);
void
check_no_tls_errors_(const char *fname, int line)
{
(void)fname;
(void)line;
// XXXX
}
void
tor_tls_log_one_error(tor_tls_t *tls, unsigned long err,
int severity, int domain, const char *doing)
{
tor_assert(tls);
(void)err;
(void)severity;
(void)domain;
(void)doing;
// XXXX
SECStatus s;
s = SSL_ExportKeyingMaterial(tls->ssl,
label, (unsigned)strlen(label),
PR_TRUE, context, (unsigned)context_len,
secrets_out, DIGEST256_LEN);
return (s == SECSuccess) ? 0 : -1;
}
const char *
tor_tls_get_ciphersuite_name(tor_tls_t *tls)
{
tor_assert(tls);
// XXXX
return NULL;
SSLChannelInfo channel_info;
SSLCipherSuiteInfo cipher_info;
memset(&channel_info, 0, sizeof(channel_info));
memset(&cipher_info, 0, sizeof(cipher_info));
SECStatus s = SSL_GetChannelInfo(tls->ssl,
&channel_info, sizeof(channel_info));
if (s != SECSuccess)
return NULL;
s = SSL_GetCipherSuiteInfo(channel_info.cipherSuite,
&cipher_info, sizeof(cipher_info));
if (s != SECSuccess)
return NULL;
return cipher_info.cipherSuiteName;
}
/** The group we should use for ecdhe when none was selected. */
#define SEC_OID_TOR_DEFAULT_ECDHE_GROUP SEC_OID_ANSIX962_EC_PRIME256V1
int
evaluate_ecgroup_for_tls(const char *ecgroup)
{
(void)ecgroup;
// XXXX
return -1;
SECOidTag tag;
if (!ecgroup)
tag = SEC_OID_TOR_DEFAULT_ECDHE_GROUP;
else if (!strcasecmp(ecgroup, "P256"))
tag = SEC_OID_ANSIX962_EC_PRIME256V1;
else if (!strcasecmp(ecgroup, "P224"))
tag = SEC_OID_SECG_EC_SECP224R1;
else
return 0;
/* I don't think we need any additional tests here for NSS */
(void) tag;
return 1;
}
static SECStatus
always_accept_cert_cb(void *arg, PRFileDesc *ssl, PRBool checkSig,
PRBool isServer)
{
(void)arg;
(void)ssl;
(void)checkSig;
(void)isServer;
return SECSuccess;
}

137
src/lib/tls/tortls_openssl.c
View File

@ -244,26 +244,6 @@ tls_log_errors(tor_tls_t *tls, int severity, int domain, const char *doing)
}
}
/** Convert an errno (or a WSAerrno on windows) into a TOR_TLS_* error
* code. */
int
tor_errno_to_tls_error(int e)
{
switch (e) {
case SOCK_ERRNO(ECONNRESET): // most common
return TOR_TLS_ERROR_CONNRESET;
case SOCK_ERRNO(ETIMEDOUT):
return TOR_TLS_ERROR_TIMEOUT;
case SOCK_ERRNO(EHOSTUNREACH):
case SOCK_ERRNO(ENETUNREACH):
return TOR_TLS_ERROR_NO_ROUTE;
case SOCK_ERRNO(ECONNREFUSED):
return TOR_TLS_ERROR_CONNREFUSED; // least common
default:
return TOR_TLS_ERROR_MISC;
}
}
#define CATCH_SYSCALL 1
#define CATCH_ZERO 2
@ -952,8 +932,6 @@ tor_tls_server_info_callback(const SSL *ssl, int type, int val)
/* Check whether we're watching for renegotiates. If so, this is one! */
if (tls->negotiated_callback)
tls->got_renegotiate = 1;
if (tls->server_handshake_count < 127) /*avoid any overflow possibility*/
++tls->server_handshake_count;
} else {
log_warn(LD_BUG, "Couldn't look up the tls for an SSL*. How odd!");
return;
@ -1167,30 +1145,13 @@ tor_tls_assert_renegotiation_unblocked(tor_tls_t *tls)
#endif /* defined(SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION) && ... */
}
/** Release resources associated with a TLS object. Does not close the
* underlying file descriptor.
*/
void
tor_tls_free_(tor_tls_t *tls)
tor_tls_impl_free_(tor_tls_impl_t *ssl)
{
if (!tls)
return;
tor_assert(tls->ssl);
{
size_t r,w;
tor_tls_get_n_raw_bytes(tls,&r,&w); /* ensure written_by_tls is updated */
}
#ifdef SSL_set_tlsext_host_name
SSL_set_tlsext_host_name(tls->ssl, NULL);
SSL_set_tlsext_host_name(ssl, NULL);
#endif
SSL_free(tls->ssl);
tls->ssl = NULL;
tls->negotiated_callback = NULL;
if (tls->context)
tor_tls_context_decref(tls->context);
tor_free(tls->address);
tls->magic = 0x99999999;
tor_free(tls);
SSL_free(ssl);
}
/** Underlying function for TLS reading. Reads up to <b>len</b>
@ -1509,90 +1470,6 @@ try_to_extract_certs_from_tls,(int severity, tor_tls_t *tls,
*id_cert_out = id_cert;
}
/** If the provided tls connection is authenticated and has a
* certificate chain that is currently valid and signed, then set
* *<b>identity_key</b> to the identity certificate's key and return
* 0. Else, return -1 and log complaints with log-level <b>severity</b>.
*/
int
tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity_key)
{
X509 *cert = NULL, *id_cert = NULL;
EVP_PKEY *id_pkey = NULL;
RSA *rsa;
int r = -1;
check_no_tls_errors();
*identity_key = NULL;
try_to_extract_certs_from_tls(severity, tls, &cert, &id_cert);
if (!cert)
goto done;
if (!id_cert) {
log_fn(severity,LD_PROTOCOL,"No distinct identity certificate found");
goto done;
}
tls_log_errors(tls, severity, LD_HANDSHAKE, "before verifying certificate");
if (!(id_pkey = X509_get_pubkey(id_cert)) ||
X509_verify(cert, id_pkey) <= 0) {
log_fn(severity,LD_PROTOCOL,"X509_verify on cert and pkey returned <= 0");
tls_log_errors(tls, severity, LD_HANDSHAKE, "verifying certificate");
goto done;
}
rsa = EVP_PKEY_get1_RSA(id_pkey);
if (!rsa)
goto done;
*identity_key = crypto_new_pk_from_openssl_rsa_(rsa);
r = 0;
done:
if (cert)
X509_free(cert);
if (id_pkey)
EVP_PKEY_free(id_pkey);
/* This should never get invoked, but let's make sure in case OpenSSL
* acts unexpectedly. */
tls_log_errors(tls, LOG_WARN, LD_HANDSHAKE, "finishing tor_tls_verify");
return r;
}
/** Check whether the certificate set on the connection <b>tls</b> is expired
* give or take <b>past_tolerance</b> seconds, or not-yet-valid give or take
* <b>future_tolerance</b> seconds. Return 0 for valid, -1 for failure.
*
* NOTE: you should call tor_tls_verify before tor_tls_check_lifetime.
*/
int
tor_tls_check_lifetime(int severity, tor_tls_t *tls,
time_t now,
int past_tolerance, int future_tolerance)
{
X509 *cert;
int r = -1;
if (!(cert = SSL_get_peer_certificate(tls->ssl)))
goto done;
if (tor_x509_check_cert_lifetime_internal(severity, cert, now,
past_tolerance,
future_tolerance) < 0)
goto done;
r = 0;
done:
if (cert)
X509_free(cert);
/* Not expected to get invoked */
tls_log_errors(tls, LOG_WARN, LD_NET, "checking certificate lifetime");
return r;
}
/** Return the number of bytes available for reading from <b>tls</b>.
*/
int
@ -1690,14 +1567,6 @@ tor_tls_used_v1_handshake(tor_tls_t *tls)
return ! tls->wasV2Handshake;
}
/** Return the number of server handshakes that we've noticed doing on
* <b>tls</b>. */
int
tor_tls_get_num_server_handshakes(tor_tls_t *tls)
{
return tls->server_handshake_count;
}
/** Return true iff the server TLS connection <b>tls</b> got the renegotiation
* request it was waiting for. */
int

17
src/lib/tls/tortls_st.h
View File

@ -6,6 +6,8 @@
#ifndef TOR_TORTLS_ST_H
#define TOR_TORTLS_ST_H
#include "lib/net/socket.h"
#define TOR_TLS_MAGIC 0x71571571
typedef enum {
@ -17,7 +19,7 @@ typedef enum {
struct tor_tls_context_t {
int refcnt;
struct ssl_ctx_st *ctx;
tor_tls_context_impl_t *ctx;
struct tor_x509_cert_t *my_link_cert;
struct tor_x509_cert_t *my_id_cert;
struct tor_x509_cert_t *my_auth_cert;
@ -31,8 +33,9 @@ struct tor_tls_context_t {
struct tor_tls_t {
uint32_t magic;
tor_tls_context_t *context; /** A link to the context object for this tls. */
struct ssl_st *ssl; /**< An OpenSSL SSL object. */
int socket; /**< The underlying file descriptor for this TLS connection. */
tor_tls_impl_t *ssl; /**< An OpenSSL SSL object or NSS PRFileDesc. */
tor_socket_t socket; /**< The underlying file descriptor for this TLS
* connection. */
char *address; /**< An address to log when describing this connection. */
tor_tls_state_bitfield_t state : 3; /**< The current SSL state,
* depending on which operations
@ -45,11 +48,10 @@ struct tor_tls_t {
* one certificate). */
/** True iff we should call negotiated_callback when we're done reading. */
unsigned int got_renegotiate:1;
#ifdef ENABLE_OPENSSL
/** Return value from tor_tls_classify_client_ciphers, or 0 if we haven't
* called that function yet. */
int8_t client_cipher_list_type;
/** Incremented every time we start the server side of a handshake. */
uint8_t server_handshake_count;
size_t wantwrite_n; /**< 0 normally, >0 if we returned wantwrite last
* time. */
/** Last values retrieved from BIO_number_read()/write(); see
@ -62,6 +64,11 @@ struct tor_tls_t {
void (*negotiated_callback)(tor_tls_t *tls, void *arg);
/** Argument to pass to negotiated_callback. */
void *callback_arg;
#endif
#ifdef ENABLE_NSS
size_t n_read_since_last_check;
size_t n_written_since_last_check;
#endif
};
#endif

26
src/test/test_tortls.c
View File

@ -72,6 +72,7 @@ test_tortls_err_to_string(void *data)
(void)1;
}
#ifdef ENABLE_OPENSSL
static int
mock_tls_cert_matches_key(const tor_tls_t *tls, const tor_x509_cert_t *cert)
{
@ -105,6 +106,7 @@ test_tortls_tor_tls_get_error(void *data)
crypto_pk_free(key2);
tor_tls_free(tls);
}
#endif
static void
test_tortls_x509_cert_get_id_digests(void *ignored)
@ -165,6 +167,7 @@ test_tortls_get_my_certs(void *ignored)
(void)1;
}
#ifdef ENABLE_OPENSSL
static void
test_tortls_get_forced_write_size(void *ignored)
{
@ -203,23 +206,6 @@ test_tortls_used_v1_handshake(void *ignored)
tor_free(tls);
}
static void
test_tortls_get_num_server_handshakes(void *ignored)
{
(void)ignored;
int ret;
tor_tls_t *tls;
tls = tor_malloc_zero(sizeof(tor_tls_t));
tls->server_handshake_count = 3;
ret = tor_tls_get_num_server_handshakes(tls);
tt_int_op(ret, OP_EQ, 3);
done:
tor_free(tls);
}
static void
test_tortls_server_got_renegotiate(void *ignored)
{
@ -236,6 +222,7 @@ test_tortls_server_got_renegotiate(void *ignored)
done:
tor_free(tls);
}
#endif
static void
test_tortls_evaluate_ecgroup_for_tls(void *ignored)
@ -266,13 +253,14 @@ test_tortls_evaluate_ecgroup_for_tls(void *ignored)
struct testcase_t tortls_tests[] = {
LOCAL_TEST_CASE(errno_to_tls_error, 0),
LOCAL_TEST_CASE(err_to_string, 0),
LOCAL_TEST_CASE(tor_tls_get_error, 0),
LOCAL_TEST_CASE(x509_cert_get_id_digests, 0),
LOCAL_TEST_CASE(get_my_certs, TT_FORK),
#ifdef ENABLE_OPENSSL
LOCAL_TEST_CASE(tor_tls_get_error, 0),
LOCAL_TEST_CASE(get_forced_write_size, 0),
LOCAL_TEST_CASE(used_v1_handshake, TT_FORK),
LOCAL_TEST_CASE(get_num_server_handshakes, 0),
LOCAL_TEST_CASE(server_got_renegotiate, 0),
#endif
LOCAL_TEST_CASE(evaluate_ecgroup_for_tls, 0),
END_OF_TESTCASES
};