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authorFlorin Coras <fcoras@cisco.com>2018-03-07 08:49:27 -0800
committerDave Barach <openvpp@barachs.net>2018-03-08 21:53:33 +0000
commitd77eee64b17762bf21f8dbe0b9f955513f81f1a5 (patch)
treedf26a38a15be4537fec42082083b755e79418202 /src/plugins/tlsmbedtls/tls_mbedtls.c
parent00f44cc1f7f3cc10c0d6b147c0bceb831a9e97fb (diff)
tls: make tls engines pluggable
- add infra for pluggable tls "engines" - makes mbedtls specific code a plugin Change-Id: I2c5b099e2b69d2be0038e3ef02b208ff907727e7 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/plugins/tlsmbedtls/tls_mbedtls.c')
-rw-r--r--src/plugins/tlsmbedtls/tls_mbedtls.c548
1 files changed, 548 insertions, 0 deletions
diff --git a/src/plugins/tlsmbedtls/tls_mbedtls.c b/src/plugins/tlsmbedtls/tls_mbedtls.c
new file mode 100644
index 00000000000..1bae1f726f8
--- /dev/null
+++ b/src/plugins/tlsmbedtls/tls_mbedtls.c
@@ -0,0 +1,548 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <mbedtls/ssl.h>
+#include <mbedtls/certs.h>
+#include <mbedtls/entropy.h>
+#include <mbedtls/ctr_drbg.h>
+#include <mbedtls/timing.h>
+#include <mbedtls/debug.h>
+#include <vnet/plugin/plugin.h>
+#include <vpp/app/version.h>
+#include <vnet/tls/tls.h>
+
+#define TLS_USE_OUR_MEM_FUNCS 0
+
+typedef struct tls_ctx_mbedtls_
+{
+ tls_ctx_t ctx; /**< First */
+ mbedtls_ssl_context ssl;
+ mbedtls_ssl_config conf;
+ mbedtls_x509_crt srvcert;
+ mbedtls_pk_context pkey;
+} mbedtls_ctx_t;
+
+typedef struct mbedtls_main_
+{
+ mbedtls_ctx_t ***ctx_pool;
+ mbedtls_ctr_drbg_context *ctr_drbgs;
+ mbedtls_entropy_context *entropy_pools;
+ mbedtls_x509_crt cacert;
+} mbedtls_main_t;
+
+static mbedtls_main_t mbedtls_main;
+
+#if TLS_USE_OUR_MEM_FUNCS
+#include <mbedtls/platform.h>
+
+void *
+mbedtls_calloc_fn (size_t n, size_t size)
+{
+ void *ptr;
+ ptr = clib_mem_alloc (n * size);
+ memset (ptr, 0, sizeof (*ptr));
+ return ptr;
+}
+
+void
+mbedtls_free_fn (void *ptr)
+{
+ if (ptr)
+ clib_mem_free (ptr);
+}
+#endif
+
+u32
+mbedtls_ctx_alloc (void)
+{
+ u8 thread_index = vlib_get_thread_index ();
+ mbedtls_main_t *tm = &mbedtls_main;
+ mbedtls_ctx_t **ctx;
+
+ pool_get (tm->ctx_pool[thread_index], ctx);
+ if (!(*ctx))
+ *ctx = clib_mem_alloc (sizeof (mbedtls_ctx_t));
+
+ memset (*ctx, 0, sizeof (mbedtls_ctx_t));
+ (*ctx)->ctx.c_thread_index = thread_index;
+ return ctx - tm->ctx_pool[thread_index];
+}
+
+void
+mbedtls_ctx_free (tls_ctx_t * ctx)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+
+ if (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER && !ctx->is_passive_close)
+ mbedtls_ssl_close_notify (&mc->ssl);
+ if (mc->ssl.conf->endpoint == MBEDTLS_SSL_IS_SERVER)
+ {
+ mbedtls_x509_crt_free (&mc->srvcert);
+ mbedtls_pk_free (&mc->pkey);
+ }
+ mbedtls_ssl_free (&mc->ssl);
+ mbedtls_ssl_config_free (&mc->conf);
+
+ pool_put_index (mbedtls_main.ctx_pool[vlib_get_thread_index ()],
+ ctx->tls_ctx_idx);
+}
+
+tls_ctx_t *
+mbedtls_ctx_get (u32 ctx_index)
+{
+ mbedtls_ctx_t **ctx;
+ ctx = pool_elt_at_index (mbedtls_main.ctx_pool[vlib_get_thread_index ()],
+ ctx_index);
+ return &(*ctx)->ctx;
+}
+
+tls_ctx_t *
+mbedtls_ctx_get_w_thread (u32 ctx_index, u8 thread_index)
+{
+ mbedtls_ctx_t **ctx;
+ ctx = pool_elt_at_index (mbedtls_main.ctx_pool[thread_index], ctx_index);
+ return &(*ctx)->ctx;
+}
+
+static int
+tls_init_ctr_seed_drbgs (void)
+{
+ u32 thread_index = vlib_get_thread_index ();
+ mbedtls_main_t *tm = &mbedtls_main;
+ u8 *pers;
+ int rv;
+ pers = format (0, "vpp thread %u", thread_index);
+
+ mbedtls_entropy_init (&tm->entropy_pools[thread_index]);
+ mbedtls_ctr_drbg_init (&mbedtls_main.ctr_drbgs[thread_index]);
+ if ((rv = mbedtls_ctr_drbg_seed (&tm->ctr_drbgs[thread_index],
+ mbedtls_entropy_func,
+ &tm->entropy_pools[thread_index],
+ (const unsigned char *) pers,
+ vec_len (pers))) != 0)
+ {
+ vec_free (pers);
+ TLS_DBG (1, " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", rv);
+ return -1;
+ }
+ vec_free (pers);
+ return 0;
+}
+
+mbedtls_ctr_drbg_context *
+tls_get_ctr_drbg ()
+{
+ u8 thread_index = vlib_get_thread_index ();
+ if (PREDICT_FALSE (!mbedtls_main.ctr_drbgs[thread_index].f_entropy))
+ tls_init_ctr_seed_drbgs ();
+ return &mbedtls_main.ctr_drbgs[thread_index];
+}
+
+static int
+tls_net_send (void *ctx_indexp, const unsigned char *buf, size_t len)
+{
+ stream_session_t *tls_session;
+ uword ctx_index;
+ tls_ctx_t *ctx;
+ int rv;
+
+ ctx_index = pointer_to_uword (ctx_indexp);
+ ctx = mbedtls_ctx_get (ctx_index);
+ tls_session = session_get_from_handle (ctx->tls_session_handle);
+ rv = svm_fifo_enqueue_nowait (tls_session->server_tx_fifo, len, buf);
+ if (rv < 0)
+ return MBEDTLS_ERR_SSL_WANT_WRITE;
+ tls_add_vpp_q_evt (tls_session->server_tx_fifo, FIFO_EVENT_APP_TX);
+ return rv;
+}
+
+static int
+tls_net_recv (void *ctx_indexp, unsigned char *buf, size_t len)
+{
+ stream_session_t *tls_session;
+ uword ctx_index;
+ tls_ctx_t *ctx;
+ int rv;
+
+ ctx_index = pointer_to_uword (ctx_indexp);
+ ctx = mbedtls_ctx_get (ctx_index);
+ tls_session = session_get_from_handle (ctx->tls_session_handle);
+ rv = svm_fifo_dequeue_nowait (tls_session->server_rx_fifo, len, buf);
+ return (rv < 0) ? 0 : rv;
+}
+
+static void
+mbedtls_debug (void *ctx, int level, const char *file, int line,
+ const char *str)
+{
+ ((void) level);
+ fprintf ((FILE *) ctx, "%s:%04d: %s", file, line, str);
+ fflush ((FILE *) ctx);
+}
+
+static int
+mbedtls_ctx_init_client (tls_ctx_t * ctx)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ mbedtls_main_t *mm = &mbedtls_main;
+ void *ctx_ptr;
+ int rv;
+
+ /*
+ * 1. Setup SSL
+ */
+ mbedtls_ssl_init (&mc->ssl);
+ mbedtls_ssl_config_init (&mc->conf);
+ if ((rv = mbedtls_ssl_config_defaults (&mc->conf, MBEDTLS_SSL_IS_CLIENT,
+ MBEDTLS_SSL_TRANSPORT_STREAM,
+ MBEDTLS_SSL_PRESET_DEFAULT)) != 0)
+ {
+ TLS_DBG (1, "failed\n ! mbedtls_ssl_config_defaults returned %d\n\n",
+ rv);
+ return -1;
+ }
+
+ mbedtls_ssl_conf_authmode (&mc->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
+ mbedtls_ssl_conf_ca_chain (&mc->conf, &mm->cacert, NULL);
+ mbedtls_ssl_conf_rng (&mc->conf, mbedtls_ctr_drbg_random,
+ tls_get_ctr_drbg ());
+ mbedtls_ssl_conf_dbg (&mc->conf, mbedtls_debug, stdout);
+
+ if ((rv = mbedtls_ssl_setup (&mc->ssl, &mc->conf)) != 0)
+ {
+ TLS_DBG (1, "failed\n ! mbedtls_ssl_setup returned %d\n", rv);
+ return -1;
+ }
+
+ if ((rv = mbedtls_ssl_set_hostname (&mc->ssl,
+ (const char *) ctx->srv_hostname)) != 0)
+ {
+ TLS_DBG (1, "failed\n ! mbedtls_ssl_set_hostname returned %d\n", rv);
+ return -1;
+ }
+
+ ctx_ptr = uword_to_pointer (ctx->tls_ctx_idx, void *);
+ mbedtls_ssl_set_bio (&mc->ssl, ctx_ptr, tls_net_send, tls_net_recv, NULL);
+ mbedtls_debug_set_threshold (TLS_DEBUG_LEVEL_CLIENT);
+
+ /*
+ * 2. Do the first 2 steps in the handshake.
+ */
+ TLS_DBG (1, "Initiating handshake for [%u]%u", ctx->c_thread_index,
+ ctx->tls_ctx_idx);
+ while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
+ {
+ rv = mbedtls_ssl_handshake_step (&mc->ssl);
+ if (rv != 0)
+ break;
+ }
+ TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
+ ctx->tls_ctx_idx, mc->ssl.state);
+ return 0;
+}
+
+static int
+mbedtls_ctx_init_server (tls_ctx_t * ctx)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ mbedtls_main_t *mm = &mbedtls_main;
+ application_t *app;
+ void *ctx_ptr;
+ int rv;
+
+ mbedtls_ssl_init (&mc->ssl);
+ mbedtls_ssl_config_init (&mc->conf);
+ mbedtls_x509_crt_init (&mc->srvcert);
+ mbedtls_pk_init (&mc->pkey);
+
+ /*
+ * 1. Cert
+ */
+ app = application_get (ctx->parent_app_index);
+ if (!app->tls_cert || !app->tls_key)
+ {
+ TLS_DBG (1, " failed\n ! tls cert and/or key not configured %d",
+ ctx->parent_app_index);
+ return -1;
+ }
+
+ rv = mbedtls_x509_crt_parse (&mc->srvcert,
+ (const unsigned char *) app->tls_cert,
+ vec_len (app->tls_cert));
+ if (rv != 0)
+ {
+ TLS_DBG (1, " failed\n ! mbedtls_x509_crt_parse returned %d", rv);
+ goto exit;
+ }
+
+ rv = mbedtls_pk_parse_key (&mc->pkey,
+ (const unsigned char *) app->tls_key,
+ vec_len (app->tls_key), NULL, 0);
+ if (rv != 0)
+ {
+ TLS_DBG (1, " failed\n ! mbedtls_pk_parse_key returned %d", rv);
+ goto exit;
+ }
+
+ /*
+ * 2. SSL context config
+ */
+ if ((rv = mbedtls_ssl_config_defaults (&mc->conf, MBEDTLS_SSL_IS_SERVER,
+ MBEDTLS_SSL_TRANSPORT_STREAM,
+ MBEDTLS_SSL_PRESET_DEFAULT)) != 0)
+ {
+ TLS_DBG (1, " failed\n ! mbedtls_ssl_config_defaults returned %d", rv);
+ goto exit;
+ }
+
+ mbedtls_ssl_conf_rng (&mc->conf, mbedtls_ctr_drbg_random,
+ tls_get_ctr_drbg ());
+ mbedtls_ssl_conf_dbg (&mc->conf, mbedtls_debug, stdout);
+
+ /* TODO CACHE
+ mbedtls_ssl_conf_session_cache( &ctx->conf, &cache,
+ mbedtls_ssl_cache_get,
+ mbedtls_ssl_cache_set );
+ */
+
+ mbedtls_ssl_conf_ca_chain (&mc->conf, &mm->cacert, NULL);
+ if ((rv = mbedtls_ssl_conf_own_cert (&mc->conf, &mc->srvcert, &mc->pkey))
+ != 0)
+ {
+ TLS_DBG (1, " failed\n ! mbedtls_ssl_conf_own_cert returned %d", rv);
+ goto exit;
+ }
+
+ if ((rv = mbedtls_ssl_setup (&mc->ssl, &mc->conf)) != 0)
+ {
+ TLS_DBG (1, " failed\n ! mbedtls_ssl_setup returned %d", rv);
+ goto exit;
+ }
+
+ mbedtls_ssl_session_reset (&mc->ssl);
+ ctx_ptr = uword_to_pointer (ctx->tls_ctx_idx, void *);
+ mbedtls_ssl_set_bio (&mc->ssl, ctx_ptr, tls_net_send, tls_net_recv, NULL);
+ mbedtls_debug_set_threshold (TLS_DEBUG_LEVEL_SERVER);
+
+ /*
+ * 3. Start handshake state machine
+ */
+ TLS_DBG (1, "Initiating handshake for [%u]%u", ctx->c_thread_index,
+ ctx->tls_ctx_idx);
+ while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
+ {
+ rv = mbedtls_ssl_handshake_step (&mc->ssl);
+ if (rv != 0)
+ break;
+ }
+
+ TLS_DBG (2, "tls state for [%u]%u is %u", ctx->c_thread_index,
+ ctx->tls_ctx_idx, mc->ssl.state);
+ return 0;
+
+exit:
+ return -1;
+}
+
+static int
+mbedtls_handshake_rx (tls_ctx_t * ctx)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ u32 flags;
+ int rv;
+ while (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
+ {
+ rv = mbedtls_ssl_handshake_step (&mc->ssl);
+ if (rv != 0)
+ break;
+ }
+ TLS_DBG (2, "tls state for %u is %u", ctx->tls_ctx_idx, mc->ssl.state);
+
+ if (mc->ssl.state != MBEDTLS_SSL_HANDSHAKE_OVER)
+ return HANDSHAKE_NOT_OVER;
+
+ /*
+ * Handshake complete
+ */
+ if (mc->ssl.conf->endpoint == MBEDTLS_SSL_IS_CLIENT)
+ {
+ /*
+ * Verify server certificate
+ */
+ if ((flags = mbedtls_ssl_get_verify_result (&mc->ssl)) != 0)
+ {
+ char buf[512];
+ TLS_DBG (1, " failed\n");
+ mbedtls_x509_crt_verify_info (buf, sizeof (buf), " ! ", flags);
+ TLS_DBG (1, "%s\n", buf);
+
+ /*
+ * Presence of hostname enforces strict certificate verification
+ */
+ if (ctx->srv_hostname)
+ return CLIENT_HANDSHAKE_FAIL;
+ }
+ rv = CLIENT_HANDSHAKE_OK;
+ }
+ else
+ {
+ rv = SERVER_HANDSHAKE_OK;
+ }
+
+ TLS_DBG (1, "Handshake for %u complete. TLS cipher is %x",
+ ctx->tls_ctx_idx, mc->ssl.session->ciphersuite);
+ return rv;
+}
+
+static int
+mbedtls_write (tls_ctx_t * ctx, u8 * buf, u32 len)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ return mbedtls_ssl_write (&mc->ssl, buf, len);
+}
+
+static int
+mbedtls_read (tls_ctx_t * ctx, u8 * buf, u32 len)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ return mbedtls_ssl_read (&mc->ssl, buf, len);
+}
+
+static u8
+mbedtls_handshake_is_over (tls_ctx_t * ctx)
+{
+ mbedtls_ctx_t *mc = (mbedtls_ctx_t *) ctx;
+ return (mc->ssl.state == MBEDTLS_SSL_HANDSHAKE_OVER);
+}
+
+const static tls_engine_vft_t mbedtls_engine = {
+ .ctx_alloc = mbedtls_ctx_alloc,
+ .ctx_free = mbedtls_ctx_free,
+ .ctx_get = mbedtls_ctx_get,
+ .ctx_get_w_thread = mbedtls_ctx_get_w_thread,
+ .ctx_init_server = mbedtls_ctx_init_server,
+ .ctx_init_client = mbedtls_ctx_init_client,
+ .ctx_handshake_rx = mbedtls_handshake_rx,
+ .ctx_write = mbedtls_write,
+ .ctx_read = mbedtls_read,
+ .ctx_handshake_is_over = mbedtls_handshake_is_over,
+};
+
+int
+tls_init_mem (void)
+{
+#if TLS_USE_OUR_MEM_FUNCS
+ mbedtls_platform_set_calloc_free (mbedtls_calloc_fn, mbedtls_free_fn);
+#endif
+ return 0;
+}
+
+static int
+tls_init_ctr_drbgs_and_entropy (u32 num_threads)
+{
+ mbedtls_main_t *mm = &mbedtls_main;
+ int i;
+
+ vec_validate (mm->ctr_drbgs, num_threads - 1);
+ vec_validate (mm->entropy_pools, num_threads - 1);
+ for (i = 0; i < num_threads; i++)
+ mm->ctr_drbgs[i].f_entropy = 0;
+
+ return 0;
+}
+
+int
+tls_init_ca_chain (void)
+{
+ mbedtls_main_t *mm = &mbedtls_main;
+ tls_main_t *tm = vnet_tls_get_main ();
+ int rv;
+
+ if (access (tm->ca_cert_path, F_OK | R_OK) == -1)
+ {
+ clib_warning ("Could not initialize TLS CA certificates");
+ return -1;
+ }
+
+ mbedtls_x509_crt_init (&mm->cacert);
+ rv = mbedtls_x509_crt_parse_file (&mm->cacert, tm->ca_cert_path);
+ if (rv < 0)
+ {
+ clib_warning ("Couldn't parse system CA certificates: -0x%x", -rv);
+ }
+ if (tm->use_test_cert_in_ca)
+ {
+ rv = mbedtls_x509_crt_parse (&mm->cacert,
+ (const unsigned char *) test_srv_crt_rsa,
+ test_srv_crt_rsa_len);
+ if (rv < 0)
+ {
+ clib_warning ("Couldn't parse test certificate: -0x%x", -rv);
+ return -1;
+ }
+ }
+ return (rv < 0 ? -1 : 0);
+}
+
+static clib_error_t *
+tls_mbedtls_init (vlib_main_t * vm)
+{
+ vlib_thread_main_t *vtm = vlib_get_thread_main ();
+ mbedtls_main_t *mm = &mbedtls_main;
+ clib_error_t *error;
+ u32 num_threads;
+
+ num_threads = 1 /* main thread */ + vtm->n_threads;
+
+ if ((error = vlib_call_init_function (vm, tls_init)))
+ return error;
+
+ if (tls_init_ca_chain ())
+ {
+ clib_warning ("failed to initialize TLS CA chain");
+ return 0;
+ }
+ if (tls_init_mem ())
+ {
+ clib_warning ("failed to initialize mem");
+ return 0;
+ }
+ if (tls_init_ctr_drbgs_and_entropy (num_threads))
+ {
+ clib_warning ("failed to initialize entropy and random generators");
+ return 0;
+ }
+
+ vec_validate (mm->ctx_pool, num_threads - 1);
+ tls_register_engine (&mbedtls_engine, TLS_ENGINE_MBEDTLS);
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (tls_mbedtls_init);
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+ .version = VPP_BUILD_VER,
+ .description = "mbedtls based TLS Engine",
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */