[or-cvs] [tor/master 3/7] Maintain separate server and client TLS contexts.
nickm at torproject.org
nickm at torproject.org
Thu Oct 21 20:21:08 UTC 2010
Author: Robert Ransom <rransom.8774 at gmail.com>
Date: Sun, 3 Oct 2010 18:14:08 -0700
Subject: Maintain separate server and client TLS contexts.
Commit: 17efbe031d4b96d872b2e0bdf3785b232f49bf44
Fixes bug #988.
---
src/common/tortls.c | 99 +++++++++++++++++++++++++++++++++++++++++++-------
src/common/tortls.h | 4 ++-
src/or/main.c | 10 ++++--
src/or/router.c | 12 +++++--
4 files changed, 104 insertions(+), 21 deletions(-)
diff --git a/src/common/tortls.c b/src/common/tortls.c
index b49f9e3..1bb3b8b 100644
--- a/src/common/tortls.c
+++ b/src/common/tortls.c
@@ -190,12 +190,16 @@ static X509* tor_tls_create_certificate(crypto_pk_env_t *rsa,
const char *cname_sign,
unsigned int lifetime);
static void tor_tls_unblock_renegotiation(tor_tls_t *tls);
+static int tor_tls_context_init_one(tor_tls_context_t **ppcontext,
+ crypto_pk_env_t *identity,
+ unsigned int key_lifetime);
static tor_tls_context_t *tor_tls_context_new(crypto_pk_env_t *identity,
unsigned int key_lifetime);
-/** Global tls context. We keep it here because nobody else needs to
- * touch it. */
-static tor_tls_context_t *global_tls_context = NULL;
+/** Global TLS contexts. We keep them here because nobody else needs
+ * to touch them. */
+static tor_tls_context_t *server_tls_context = NULL;
+static tor_tls_context_t *client_tls_context = NULL;
/** True iff tor_tls_init() has been called. */
static int tls_library_is_initialized = 0;
@@ -431,9 +435,15 @@ tor_tls_init(void)
void
tor_tls_free_all(void)
{
- if (global_tls_context) {
- tor_tls_context_decref(global_tls_context);
- global_tls_context = NULL;
+ if (server_tls_context) {
+ tor_tls_context_t *ctx = server_tls_context;
+ server_tls_context = NULL;
+ tor_tls_context_decref(ctx);
+ }
+ if (client_tls_context) {
+ tor_tls_context_t *ctx = client_tls_context;
+ client_tls_context = NULL;
+ tor_tls_context_decref(ctx);
}
if (!HT_EMPTY(&tlsmap_root)) {
log_warn(LD_MM, "Still have entries in the tlsmap at shutdown.");
@@ -620,21 +630,80 @@ tor_tls_context_incref(tor_tls_context_t *ctx)
++ctx->refcnt;
}
+/** Create new global client and server TLS contexts.
+ *
+ * If <b>server_identity</b> is NULL, this will not generate a server
+ * TLS context. If <b>is_public_server</b> is non-zero, this will use
+ * the same TLS context for incoming and outgoing connections, and
+ * ignore <b>client_identity</b>. */
+int
+tor_tls_context_init(int is_public_server,
+ crypto_pk_env_t *client_identity,
+ crypto_pk_env_t *server_identity,
+ unsigned int key_lifetime)
+{
+ int rv1 = 0;
+ int rv2 = 0;
+
+ if (is_public_server) {
+ tor_tls_context_t *new_ctx;
+ tor_tls_context_t *old_ctx;
+
+ tor_assert(server_identity != NULL);
+
+ rv1 = tor_tls_context_init_one(&server_tls_context,
+ server_identity,
+ key_lifetime);
+
+ if (rv1 >= 0) {
+ new_ctx = server_tls_context;
+ tor_tls_context_incref(new_ctx);
+ old_ctx = client_tls_context;
+ client_tls_context = new_ctx;
+
+ if (old_ctx != NULL) {
+ tor_tls_context_decref(old_ctx);
+ }
+ }
+ } else {
+ if (server_identity != NULL) {
+ rv1 = tor_tls_context_init_one(&server_tls_context,
+ server_identity,
+ key_lifetime);
+ } else {
+ tor_tls_context_t *old_ctx = server_tls_context;
+ server_tls_context = NULL;
+
+ if (old_ctx != NULL) {
+ tor_tls_context_decref(old_ctx);
+ }
+ }
+
+ rv2 = tor_tls_context_init_one(&client_tls_context,
+ client_identity,
+ key_lifetime);
+ }
+
+ return MIN(rv1, rv2);
+}
+
/** Create a new global TLS context.
*
* You can call this function multiple times. Each time you call it,
* it generates new certificates; all new connections will use
* the new SSL context.
*/
-int
-tor_tls_context_init(crypto_pk_env_t *identity, unsigned int key_lifetime)
+static int
+tor_tls_context_init_one(tor_tls_context_t **ppcontext,
+ crypto_pk_env_t *identity,
+ unsigned int key_lifetime)
{
tor_tls_context_t *new_ctx = tor_tls_context_new(identity,
key_lifetime);
- tor_tls_context_t *old_ctx = global_tls_context;
+ tor_tls_context_t *old_ctx = *ppcontext;
if (new_ctx != NULL) {
- global_tls_context = new_ctx;
+ *ppcontext = new_ctx;
/* Free the old context if one existed. */
if (old_ctx != NULL) {
@@ -946,9 +1015,11 @@ tor_tls_new(int sock, int isServer)
{
BIO *bio = NULL;
tor_tls_t *result = tor_malloc_zero(sizeof(tor_tls_t));
+ tor_tls_context_t *context = isServer ? server_tls_context :
+ client_tls_context;
- tor_assert(global_tls_context); /* make sure somebody made it first */
- if (!(result->ssl = SSL_new(global_tls_context->ctx))) {
+ tor_assert(context); /* make sure somebody made it first */
+ if (!(result->ssl = SSL_new(context->ctx))) {
tls_log_errors(NULL, LOG_WARN, LD_NET, "creating SSL object");
tor_free(result);
return NULL;
@@ -988,8 +1059,8 @@ tor_tls_new(int sock, int isServer)
}
HT_INSERT(tlsmap, &tlsmap_root, result);
SSL_set_bio(result->ssl, bio, bio);
- tor_tls_context_incref(global_tls_context);
- result->context = global_tls_context;
+ tor_tls_context_incref(context);
+ result->context = context;
result->state = TOR_TLS_ST_HANDSHAKE;
result->isServer = isServer;
result->wantwrite_n = 0;
diff --git a/src/common/tortls.h b/src/common/tortls.h
index 4038266..955027b 100644
--- a/src/common/tortls.h
+++ b/src/common/tortls.h
@@ -50,7 +50,9 @@ typedef struct tor_tls_t tor_tls_t;
const char *tor_tls_err_to_string(int err);
void tor_tls_free_all(void);
-int tor_tls_context_init(crypto_pk_env_t *identity,
+int tor_tls_context_init(int is_public_server,
+ crypto_pk_env_t *client_identity,
+ crypto_pk_env_t *server_identity,
unsigned int key_lifetime);
tor_tls_t *tor_tls_new(int sock, int is_server);
void tor_tls_set_logged_address(tor_tls_t *tls, const char *address);
diff --git a/src/or/main.c b/src/or/main.c
index 5091e20..01c27f0 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -875,6 +875,7 @@ run_scheduled_events(time_t now)
static int should_init_bridge_stats = 1;
static time_t time_to_retry_dns_init = 0;
or_options_t *options = get_options();
+ int is_server = server_mode(options);
int i;
int have_dir_info;
@@ -896,7 +897,7 @@ run_scheduled_events(time_t now)
* shut down and restart all cpuworkers, and update the directory if
* necessary.
*/
- if (server_mode(options) &&
+ if (is_server &&
get_onion_key_set_at()+MIN_ONION_KEY_LIFETIME < now) {
log_info(LD_GENERAL,"Rotating onion key.");
rotate_onion_key();
@@ -930,7 +931,10 @@ run_scheduled_events(time_t now)
last_rotated_x509_certificate = now;
if (last_rotated_x509_certificate+MAX_SSL_KEY_LIFETIME < now) {
log_info(LD_GENERAL,"Rotating tls context.");
- if (tor_tls_context_init(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
+ if (tor_tls_context_init(public_server_mode(options),
+ get_identity_key(),
+ is_server ? get_identity_key() : NULL,
+ MAX_SSL_KEY_LIFETIME) < 0) {
log_warn(LD_BUG, "Error reinitializing TLS context");
/* XXX is it a bug here, that we just keep going? -RD */
}
@@ -1213,7 +1217,7 @@ run_scheduled_events(time_t now)
/** 9. and if we're a server, check whether our DNS is telling stories to
* us. */
- if (server_mode(options) && time_to_check_for_correct_dns < now) {
+ if (is_server && time_to_check_for_correct_dns < now) {
if (!time_to_check_for_correct_dns) {
time_to_check_for_correct_dns = now + 60 + crypto_rand_int(120);
} else {
diff --git a/src/or/router.c b/src/or/router.c
index bde6e25..c59e4b2 100644
--- a/src/or/router.c
+++ b/src/or/router.c
@@ -471,8 +471,11 @@ init_keys(void)
return -1;
}
set_identity_key(prkey);
- /* Create a TLS context; default the client nickname to "client". */
- if (tor_tls_context_init(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
+ /* Create a TLS context. */
+ if (tor_tls_context_init(0,
+ get_identity_key(),
+ NULL,
+ MAX_SSL_KEY_LIFETIME) < 0) {
log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
return -1;
}
@@ -550,7 +553,10 @@ init_keys(void)
tor_free(keydir);
/* 3. Initialize link key and TLS context. */
- if (tor_tls_context_init(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
+ if (tor_tls_context_init(public_server_mode(options),
+ get_identity_key(),
+ get_identity_key(),
+ MAX_SSL_KEY_LIFETIME) < 0) {
log_err(LD_GENERAL,"Error initializing TLS context");
return -1;
}
--
1.7.1
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