diff options
Diffstat (limited to 'src/plugins/tlsmbedtls')
| -rw-r--r-- | src/plugins/tlsmbedtls/tls_mbedtls.c | 548 |
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: + */ |