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curl/lib/vtls/mbedtls.c
Stefan Eissing c9b95c0bb3
lib: graceful connection shutdown 
When libcurl discards a connection there are two phases this may go
through: "shutdown" and "closing". If a connection is aborted, the
shutdown phase is skipped and it is closed right away.

The connection filters attached to the connection implement the phases
in their `do_shutdown()` and `do_close()` callbacks. Filters carry now a
`shutdown` flags next to `connected` to keep track of the shutdown
operation.

Filters are shut down from top to bottom. If a filter is not connected,
its shutdown is skipped. Notable filters that *do* something during
shutdown are HTTP/2 and TLS. HTTP/2 sends the GOAWAY frame. TLS sends
its close notify and expects to receive a close notify from the server.

As sends and receives may EAGAIN on the network, a shutdown is often not
successful right away and needs to poll the connection's socket(s). To
facilitate this, such connections are placed on a new shutdown list
inside the connection cache.

Since managing this list requires the cooperation of a multi handle,
only the connection cache belonging to a multi handle is used. If a
connection was in another cache when being discarded, it is removed
there and added to the multi's cache. If no multi handle is available at
that time, the connection is shutdown and closed in a one-time,
best-effort attempt.

When a multi handle is destroyed, all connection still on the shutdown
list are discarded with a final shutdown attempt and close. In curl
debug builds, the environment variable `CURL_GRACEFUL_SHUTDOWN` can be
set to make this graceful with a timeout in milliseconds given by the
variable.

The shutdown list is limited to the max number of connections configured
for a multi cache. Set via CURLMOPT_MAX_TOTAL_CONNECTIONS. When the
limit is reached, the oldest connection on the shutdown list is
discarded.

- In multi_wait() and multi_waitfds(), collect all connection caches
  involved (each transfer might carry its own) into a temporary list.
  Let each connection cache on the list contribute sockets and
  POLLIN/OUT events it's connections are waiting for.

- in multi_perform() collect the connection caches the same way and let
  them peform their maintenance. This will make another non-blocking
  attempt to shutdown all connections on its shutdown list.

- for event based multis (multi->socket_cb set), add the sockets and
  their poll events via the callback. When `multi_socket()` is invoked
  for a socket not known by an active transfer, forward this to the
  multi's cache for processing. On closing a connection, remove its
  socket(s) via the callback.

TLS connection filters MUST NOT send close nofity messages in their
`do_close()` implementation. The reason is that a TLS close notify
signals a success. When a connection is aborted and skips its shutdown
phase, the server needs to see a missing close notify to detect
something has gone wrong.

A graceful shutdown of FTP's data connection is performed implicitly
before regarding the upload/download as complete and continuing on the
control connection. For FTP without TLS, there is just the socket close
happening. But with TLS, the sent/received close notify signals that the
transfer is complete and healthy. Servers like `vsftpd` verify that and
reject uploads without a TLS close notify.

- added test_19_* for shutdown related tests
- test_19_01 and test_19_02 test for TCP RST packets
  which happen without a graceful shutdown and should
  no longer appear otherwise.
- add test_19_03 for handling shutdowns by the server
- add test_19_04 for handling shutdowns by curl
- add test_19_05 for event based shutdowny by server
- add test_30_06/07 and test_31_06/07 for shutdown checks
  on FTP up- and downloads.

Closes #13976
2024-06-26 08:33:17 +02:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) Hoi-Ho Chan, <hoiho.chan@gmail.com>
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/*
* Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
* but vtls.c should ever call or use these functions.
*
*/
#include "curl_setup.h"
#ifdef USE_MBEDTLS
/* Define this to enable lots of debugging for mbedTLS */
/* #define MBEDTLS_DEBUG */
#ifdef __GNUC__
#pragma GCC diagnostic push
/* mbedTLS (as of v3.5.1) has a duplicate function declaration
in its public headers. Disable the warning that detects it. */
#pragma GCC diagnostic ignored "-Wredundant-decls"
#endif
#include <mbedtls/version.h>
#if MBEDTLS_VERSION_NUMBER >= 0x02040000
#include <mbedtls/net_sockets.h>
#else
#include <mbedtls/net.h>
#endif
#include <mbedtls/ssl.h>
#include <mbedtls/x509.h>
#include <mbedtls/error.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/sha256.h>
#if MBEDTLS_VERSION_MAJOR >= 2
# ifdef MBEDTLS_DEBUG
# include <mbedtls/debug.h>
# endif
#endif
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
#include "cipher_suite.h"
#include "strcase.h"
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "mbedtls.h"
#include "vtls.h"
#include "vtls_int.h"
#include "x509asn1.h"
#include "parsedate.h"
#include "connect.h" /* for the connect timeout */
#include "select.h"
#include "multiif.h"
#include "mbedtls_threadlock.h"
#include "strdup.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* ALPN for http2 */
#ifdef USE_HTTP2
# undef HAS_ALPN
# ifdef MBEDTLS_SSL_ALPN
# define HAS_ALPN
# endif
#endif
struct mbed_ssl_backend_data {
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_context entropy;
mbedtls_ssl_context ssl;
mbedtls_x509_crt cacert;
mbedtls_x509_crt clicert;
#ifdef MBEDTLS_X509_CRL_PARSE_C
mbedtls_x509_crl crl;
#endif
mbedtls_pk_context pk;
mbedtls_ssl_config config;
#ifdef HAS_ALPN
const char *protocols[3];
#endif
int *ciphersuites;
BIT(initialized); /* mbedtls_ssl_context is initialized */
BIT(sent_shutdown);
};
/* apply threading? */
#if (defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) || \
defined(_WIN32)
#define THREADING_SUPPORT
#endif
#ifndef MBEDTLS_ERROR_C
#define mbedtls_strerror(a,b,c) b[0] = 0
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && MBEDTLS_VERSION_NUMBER >= 0x03060000
#define TLS13_SUPPORT
#endif
#if defined(THREADING_SUPPORT)
static mbedtls_entropy_context ts_entropy;
static int entropy_init_initialized = 0;
static void entropy_init_mutex(mbedtls_entropy_context *ctx)
{
/* lock 0 = entropy_init_mutex() */
Curl_mbedtlsthreadlock_lock_function(0);
if(entropy_init_initialized == 0) {
mbedtls_entropy_init(ctx);
entropy_init_initialized = 1;
}
Curl_mbedtlsthreadlock_unlock_function(0);
}
static void entropy_cleanup_mutex(mbedtls_entropy_context *ctx)
{
/* lock 0 = use same lock as init */
Curl_mbedtlsthreadlock_lock_function(0);
if(entropy_init_initialized == 1) {
mbedtls_entropy_free(ctx);
entropy_init_initialized = 0;
}
Curl_mbedtlsthreadlock_unlock_function(0);
}
static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
{
int ret;
/* lock 1 = entropy_func_mutex() */
Curl_mbedtlsthreadlock_lock_function(1);
ret = mbedtls_entropy_func(data, output, len);
Curl_mbedtlsthreadlock_unlock_function(1);
return ret;
}
#endif /* THREADING_SUPPORT */
#ifdef MBEDTLS_DEBUG
static void mbed_debug(void *context, int level, const char *f_name,
int line_nb, const char *line)
{
struct Curl_easy *data = (struct Curl_easy *)context;
(void) level;
(void) line_nb;
(void) f_name;
if(data) {
size_t len = strlen(line);
if(len && (line[len - 1] == '\n'))
/* discount any trailing newline */
len--;
infof(data, "%.*s", (int)len, line);
}
}
#endif
static int mbedtls_bio_cf_write(void *bio,
const unsigned char *buf, size_t blen)
{
struct Curl_cfilter *cf = bio;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
ssize_t nwritten;
CURLcode result;
DEBUGASSERT(data);
if(!data)
return 0;
nwritten = Curl_conn_cf_send(cf->next, data, (char *)buf, blen, &result);
CURL_TRC_CF(data, cf, "mbedtls_bio_cf_out_write(len=%zu) -> %zd, err=%d",
blen, nwritten, result);
if(nwritten < 0 && CURLE_AGAIN == result) {
nwritten = MBEDTLS_ERR_SSL_WANT_WRITE;
}
return (int)nwritten;
}
static int mbedtls_bio_cf_read(void *bio, unsigned char *buf, size_t blen)
{
struct Curl_cfilter *cf = bio;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
ssize_t nread;
CURLcode result;
DEBUGASSERT(data);
if(!data)
return 0;
/* OpenSSL catches this case, so should we. */
if(!buf)
return 0;
nread = Curl_conn_cf_recv(cf->next, data, (char *)buf, blen, &result);
CURL_TRC_CF(data, cf, "mbedtls_bio_cf_in_read(len=%zu) -> %zd, err=%d",
blen, nread, result);
if(nread < 0 && CURLE_AGAIN == result) {
nread = MBEDTLS_ERR_SSL_WANT_READ;
}
return (int)nread;
}
/*
* profile
*/
static const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_fr =
{
/* Hashes from SHA-1 and above */
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA1) |
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_RIPEMD160) |
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA224) |
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA256) |
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA384) |
MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA512),
0xFFFFFFF, /* Any PK alg */
0xFFFFFFF, /* Any curve */
1024, /* RSA min key len */
};
/* See https://tls.mbed.org/discussions/generic/
howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der
*/
#define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
#define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
#define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
#if MBEDTLS_VERSION_NUMBER >= 0x03020000
static CURLcode mbedtls_version_from_curl(
mbedtls_ssl_protocol_version* mbedver, long version)
{
switch(version) {
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
*mbedver = MBEDTLS_SSL_VERSION_TLS1_2;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_3:
#ifdef TLS13_SUPPORT
*mbedver = MBEDTLS_SSL_VERSION_TLS1_3;
return CURLE_OK;
#else
break;
#endif
}
return CURLE_SSL_CONNECT_ERROR;
}
#else
static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
{
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
switch(version) {
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
*mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_3:
break;
}
#else
switch(version) {
case CURL_SSLVERSION_TLSv1_0:
*mbedver = MBEDTLS_SSL_MINOR_VERSION_1;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_1:
*mbedver = MBEDTLS_SSL_MINOR_VERSION_2;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_2:
*mbedver = MBEDTLS_SSL_MINOR_VERSION_3;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_3:
break;
}
#endif
return CURLE_SSL_CONNECT_ERROR;
}
#endif
static CURLcode
set_ssl_version_min_max(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
#if MBEDTLS_VERSION_NUMBER >= 0x03020000
mbedtls_ssl_protocol_version mbedtls_ver_min = MBEDTLS_SSL_VERSION_TLS1_2;
#ifdef TLS13_SUPPORT
mbedtls_ssl_protocol_version mbedtls_ver_max = MBEDTLS_SSL_VERSION_TLS1_3;
#else
mbedtls_ssl_protocol_version mbedtls_ver_max = MBEDTLS_SSL_VERSION_TLS1_2;
#endif
#elif MBEDTLS_VERSION_NUMBER >= 0x03000000
int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_3;
int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_3;
#else
int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_1;
int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_1;
#endif
long ssl_version = conn_config->version;
long ssl_version_max = conn_config->version_max;
CURLcode result = CURLE_OK;
DEBUGASSERT(backend);
switch(ssl_version) {
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
ssl_version = CURL_SSLVERSION_TLSv1_0;
break;
}
switch(ssl_version_max) {
case CURL_SSLVERSION_MAX_NONE:
case CURL_SSLVERSION_MAX_DEFAULT:
#ifdef TLS13_SUPPORT
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_3;
#else
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
#endif
break;
}
result = mbedtls_version_from_curl(&mbedtls_ver_min, ssl_version);
if(result) {
failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
return result;
}
result = mbedtls_version_from_curl(&mbedtls_ver_max, ssl_version_max >> 16);
if(result) {
failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
return result;
}
#if MBEDTLS_VERSION_NUMBER >= 0x03020000
mbedtls_ssl_conf_min_tls_version(&backend->config, mbedtls_ver_min);
mbedtls_ssl_conf_max_tls_version(&backend->config, mbedtls_ver_max);
#else
mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
mbedtls_ver_min);
mbedtls_ssl_conf_max_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
mbedtls_ver_max);
#endif
#ifdef TLS13_SUPPORT
if(mbedtls_ver_min == MBEDTLS_SSL_VERSION_TLS1_3) {
mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_REQUIRED);
}
else {
mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
}
#else
mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
#endif
return result;
}
/* TLS_ECJPAKE_WITH_AES_128_CCM_8 (0xC0FF) is marked experimental
in mbedTLS. The number is not reserved by IANA nor is the
cipher suite present in other SSL implementations. Provide
provisional support for specifying the cipher suite here. */
#ifdef MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8
static int
mbed_cipher_suite_get_str(uint16_t id, char *buf, size_t buf_size,
bool prefer_rfc)
{
if(id == MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8)
msnprintf(buf, buf_size, "%s", "TLS_ECJPAKE_WITH_AES_128_CCM_8");
else
return Curl_cipher_suite_get_str(id, buf, buf_size, prefer_rfc);
return 0;
}
static uint16_t
mbed_cipher_suite_walk_str(const char **str, const char **end)
{
uint16_t id = Curl_cipher_suite_walk_str(str, end);
size_t len = *end - *str;
if(!id) {
if(strncasecompare("TLS_ECJPAKE_WITH_AES_128_CCM_8", *str, len))
id = MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8;
}
return id;
}
#else
#define mbed_cipher_suite_get_str Curl_cipher_suite_get_str
#define mbed_cipher_suite_walk_str Curl_cipher_suite_walk_str
#endif
static CURLcode
mbed_set_selected_ciphers(struct Curl_easy *data,
struct mbed_ssl_backend_data *backend,
const char *ciphers)
{
const int *supported;
int *selected;
size_t supported_len, count = 0, i;
const char *ptr, *end;
supported = mbedtls_ssl_list_ciphersuites();
for(i = 0; supported[i] != 0; i++);
supported_len = i;
selected = malloc(sizeof(int) * (supported_len + 1));
if(!selected)
return CURLE_OUT_OF_MEMORY;
for(ptr = ciphers; ptr[0] != '\0' && count < supported_len; ptr = end) {
uint16_t id = mbed_cipher_suite_walk_str(&ptr, &end);
/* Check if cipher is supported */
if(id) {
for(i = 0; i < supported_len && supported[i] != id; i++);
if(i == supported_len)
id = 0;
}
if(!id) {
if(ptr[0] != '\0')
infof(data, "mbedTLS: unknown cipher in list: \"%.*s\"",
(int) (end - ptr), ptr);
continue;
}
/* No duplicates allowed (so selected cannot overflow) */
for(i = 0; i < count && selected[i] != id; i++);
if(i < count) {
infof(data, "mbedTLS: duplicate cipher in list: \"%.*s\"",
(int) (end - ptr), ptr);
continue;
}
selected[count++] = id;
}
selected[count] = 0;
if(count == 0) {
free(selected);
failf(data, "mbedTLS: no supported cipher in list");
return CURLE_SSL_CIPHER;
}
/* mbedtls_ssl_conf_ciphersuites(): The ciphersuites array is not copied.
It must remain valid for the lifetime of the SSL configuration */
backend->ciphersuites = selected;
mbedtls_ssl_conf_ciphersuites(&backend->config, backend->ciphersuites);
return CURLE_OK;
}
#ifdef TLS13_SUPPORT
static int mbed_no_verify(void *udata, mbedtls_x509_crt *crt,
int depth, uint32_t *flags)
{
(void)udata;
(void)crt;
(void)depth;
/* we clear any faults the mbedtls' own verification found.
* See <https://github.com/Mbed-TLS/mbedtls/issues/9210> */
*flags = 0;
return 0;
}
#endif
static CURLcode
mbed_connect_step1(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
const struct curl_blob *ca_info_blob = conn_config->ca_info_blob;
struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
const char * const ssl_cafile =
/* CURLOPT_CAINFO_BLOB overrides CURLOPT_CAINFO */
(ca_info_blob ? NULL : conn_config->CAfile);
const bool verifypeer = conn_config->verifypeer;
const char * const ssl_capath = conn_config->CApath;
char * const ssl_cert = ssl_config->primary.clientcert;
const struct curl_blob *ssl_cert_blob = ssl_config->primary.cert_blob;
const char * const ssl_crlfile = ssl_config->primary.CRLfile;
const char *hostname = connssl->peer.hostname;
int ret = -1;
char errorbuf[128];
DEBUGASSERT(backend);
DEBUGASSERT(!backend->initialized);
if((conn_config->version == CURL_SSLVERSION_SSLv2) ||
(conn_config->version == CURL_SSLVERSION_SSLv3)) {
failf(data, "Not supported SSL version");
return CURLE_NOT_BUILT_IN;
}
#ifdef TLS13_SUPPORT
ret = psa_crypto_init();
if(ret != PSA_SUCCESS) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "mbedTLS psa_crypto_init returned (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CONNECT_ERROR;
}
#endif /* TLS13_SUPPORT */
#ifdef THREADING_SUPPORT
mbedtls_ctr_drbg_init(&backend->ctr_drbg);
ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, entropy_func_mutex,
&ts_entropy, NULL, 0);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
-ret, errorbuf);
return CURLE_FAILED_INIT;
}
#else
mbedtls_entropy_init(&backend->entropy);
mbedtls_ctr_drbg_init(&backend->ctr_drbg);
ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, mbedtls_entropy_func,
&backend->entropy, NULL, 0);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
-ret, errorbuf);
return CURLE_FAILED_INIT;
}
#endif /* THREADING_SUPPORT */
/* Load the trusted CA */
mbedtls_x509_crt_init(&backend->cacert);
if(ca_info_blob && verifypeer) {
/* Unfortunately, mbedtls_x509_crt_parse() requires the data to be null
terminated even when provided the exact length, forcing us to waste
extra memory here. */
unsigned char *newblob = Curl_memdup0(ca_info_blob->data,
ca_info_blob->len);
if(!newblob)
return CURLE_OUT_OF_MEMORY;
ret = mbedtls_x509_crt_parse(&backend->cacert, newblob,
ca_info_blob->len + 1);
free(newblob);
if(ret<0) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error importing ca cert blob - mbedTLS: (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
}
if(ssl_cafile && verifypeer) {
#ifdef MBEDTLS_FS_IO
ret = mbedtls_x509_crt_parse_file(&backend->cacert, ssl_cafile);
if(ret<0) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
ssl_cafile, -ret, errorbuf);
return CURLE_SSL_CACERT_BADFILE;
}
#else
failf(data, "mbedtls: functions that use the filesystem not built in");
return CURLE_NOT_BUILT_IN;
#endif
}
if(ssl_capath) {
#ifdef MBEDTLS_FS_IO
ret = mbedtls_x509_crt_parse_path(&backend->cacert, ssl_capath);
if(ret<0) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
ssl_capath, -ret, errorbuf);
if(verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
#else
failf(data, "mbedtls: functions that use the filesystem not built in");
return CURLE_NOT_BUILT_IN;
#endif
}
/* Load the client certificate */
mbedtls_x509_crt_init(&backend->clicert);
if(ssl_cert) {
#ifdef MBEDTLS_FS_IO
ret = mbedtls_x509_crt_parse_file(&backend->clicert, ssl_cert);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
ssl_cert, -ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
#else
failf(data, "mbedtls: functions that use the filesystem not built in");
return CURLE_NOT_BUILT_IN;
#endif
}
if(ssl_cert_blob) {
/* Unfortunately, mbedtls_x509_crt_parse() requires the data to be null
terminated even when provided the exact length, forcing us to waste
extra memory here. */
unsigned char *newblob = Curl_memdup0(ssl_cert_blob->data,
ssl_cert_blob->len);
if(!newblob)
return CURLE_OUT_OF_MEMORY;
ret = mbedtls_x509_crt_parse(&backend->clicert, newblob,
ssl_cert_blob->len + 1);
free(newblob);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
ssl_config->key, -ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
}
/* Load the client private key */
mbedtls_pk_init(&backend->pk);
if(ssl_config->key || ssl_config->key_blob) {
if(ssl_config->key) {
#ifdef MBEDTLS_FS_IO
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
ssl_config->key_passwd,
mbedtls_ctr_drbg_random,
&backend->ctr_drbg);
#else
ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
ssl_config->key_passwd);
#endif
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
ssl_config->key, -ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
#else
failf(data, "mbedtls: functions that use the filesystem not built in");
return CURLE_NOT_BUILT_IN;
#endif
}
else {
const struct curl_blob *ssl_key_blob = ssl_config->key_blob;
const unsigned char *key_data =
(const unsigned char *)ssl_key_blob->data;
const char *passwd = ssl_config->key_passwd;
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
ret = mbedtls_pk_parse_key(&backend->pk, key_data, ssl_key_blob->len,
(const unsigned char *)passwd,
passwd ? strlen(passwd) : 0,
mbedtls_ctr_drbg_random,
&backend->ctr_drbg);
#else
ret = mbedtls_pk_parse_key(&backend->pk, key_data, ssl_key_blob->len,
(const unsigned char *)passwd,
passwd ? strlen(passwd) : 0);
#endif
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error parsing private key - mbedTLS: (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
}
if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) ||
mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_ECKEY)))
ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
}
/* Load the CRL */
#ifdef MBEDTLS_X509_CRL_PARSE_C
mbedtls_x509_crl_init(&backend->crl);
if(ssl_crlfile) {
#ifdef MBEDTLS_FS_IO
ret = mbedtls_x509_crl_parse_file(&backend->crl, ssl_crlfile);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
ssl_crlfile, -ret, errorbuf);
return CURLE_SSL_CRL_BADFILE;
}
#else
failf(data, "mbedtls: functions that use the filesystem not built in");
return CURLE_NOT_BUILT_IN;
#endif
}
#else
if(ssl_crlfile) {
failf(data, "mbedtls: crl support not built in");
return CURLE_NOT_BUILT_IN;
}
#endif
infof(data, "mbedTLS: Connecting to %s:%d", hostname, connssl->peer.port);
mbedtls_ssl_config_init(&backend->config);
ret = mbedtls_ssl_config_defaults(&backend->config,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT);
if(ret) {
failf(data, "mbedTLS: ssl_config failed");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef TLS13_SUPPORT
if(!verifypeer) {
/* Default verify behaviour changed in mbedtls v3.6.0 with TLS v1.3.
* On 1.3 connections, the handshake fails by default without trust
* anchors. We override this questionable change by installing our
* own verify callback that clears all errors. */
mbedtls_ssl_conf_verify(&backend->config, mbed_no_verify, cf);
}
#endif
mbedtls_ssl_init(&backend->ssl);
backend->initialized = TRUE;
/* new profile with RSA min key len = 1024 ... */
mbedtls_ssl_conf_cert_profile(&backend->config,
&mbedtls_x509_crt_profile_fr);
switch(conn_config->version) {
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
#if MBEDTLS_VERSION_NUMBER < 0x03000000
mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3,
MBEDTLS_SSL_MINOR_VERSION_1);
infof(data, "mbedTLS: Set min SSL version to TLS 1.0");
break;
#endif
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
case CURL_SSLVERSION_TLSv1_3:
{
CURLcode result = set_ssl_version_min_max(cf, data);
if(result != CURLE_OK)
return result;
break;
}
default:
failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
return CURLE_SSL_CONNECT_ERROR;
}
mbedtls_ssl_conf_rng(&backend->config, mbedtls_ctr_drbg_random,
&backend->ctr_drbg);
ret = mbedtls_ssl_setup(&backend->ssl, &backend->config);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "ssl_setup failed - mbedTLS: (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CONNECT_ERROR;
}
mbedtls_ssl_set_bio(&backend->ssl, cf,
mbedtls_bio_cf_write,
mbedtls_bio_cf_read,
NULL /* rev_timeout() */);
if(conn_config->cipher_list) {
CURLcode result = mbed_set_selected_ciphers(data, backend,
conn_config->cipher_list);
if(result != CURLE_OK) {
failf(data, "mbedTLS: failed to set cipher suites");
return result;
}
}
else {
mbedtls_ssl_conf_ciphersuites(&backend->config,
mbedtls_ssl_list_ciphersuites());
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
mbedtls_ssl_conf_renegotiation(&backend->config,
MBEDTLS_SSL_RENEGOTIATION_ENABLED);
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
mbedtls_ssl_conf_session_tickets(&backend->config,
MBEDTLS_SSL_SESSION_TICKETS_DISABLED);
#endif
/* Check if there's a cached ID we can/should use here! */
if(ssl_config->primary.sessionid) {
void *old_session = NULL;
Curl_ssl_sessionid_lock(data);
if(!Curl_ssl_getsessionid(cf, data, &connssl->peer, &old_session, NULL)) {
ret = mbedtls_ssl_set_session(&backend->ssl, old_session);
if(ret) {
Curl_ssl_sessionid_unlock(data);
failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "mbedTLS reusing session");
}
Curl_ssl_sessionid_unlock(data);
}
mbedtls_ssl_conf_ca_chain(&backend->config,
&backend->cacert,
#ifdef MBEDTLS_X509_CRL_PARSE_C
&backend->crl);
#else
NULL);
#endif
if(ssl_config->key || ssl_config->key_blob) {
mbedtls_ssl_conf_own_cert(&backend->config,
&backend->clicert, &backend->pk);
}
if(mbedtls_ssl_set_hostname(&backend->ssl, connssl->peer.sni?
connssl->peer.sni : connssl->peer.hostname)) {
/* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks and
the name to set in the SNI extension. So even if curl connects to a
host specified as an IP address, this function must be used. */
failf(data, "Failed to set SNI");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef HAS_ALPN
if(connssl->alpn) {
struct alpn_proto_buf proto;
size_t i;
for(i = 0; i < connssl->alpn->count; ++i) {
backend->protocols[i] = connssl->alpn->entries[i];
}
/* this function doesn't clone the protocols array, which is why we need
to keep it around */
if(mbedtls_ssl_conf_alpn_protocols(&backend->config,
&backend->protocols[0])) {
failf(data, "Failed setting ALPN protocols");
return CURLE_SSL_CONNECT_ERROR;
}
Curl_alpn_to_proto_str(&proto, connssl->alpn);
infof(data, VTLS_INFOF_ALPN_OFFER_1STR, proto.data);
}
#endif
#ifdef MBEDTLS_DEBUG
/* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */
mbedtls_ssl_conf_dbg(&backend->config, mbed_debug, data);
/* - 0 No debug
* - 1 Error
* - 2 State change
* - 3 Informational
* - 4 Verbose
*/
mbedtls_debug_set_threshold(4);
#endif
/* give application a chance to interfere with mbedTLS set up. */
if(data->set.ssl.fsslctx) {
CURLcode result = (*data->set.ssl.fsslctx)(data, &backend->config,
data->set.ssl.fsslctxp);
if(result != CURLE_OK) {
failf(data, "error signaled by ssl ctx callback");
return result;
}
}
connssl->connecting_state = ssl_connect_2;
return CURLE_OK;
}
static int count_server_cert(const mbedtls_x509_crt *peercert)
{
int count = 1;
DEBUGASSERT(peercert);
while(peercert->next) {
++count;
peercert = peercert->next;
}
return count;
}
static CURLcode collect_server_cert_single(struct Curl_easy *data,
const mbedtls_x509_crt *server_cert,
int idx)
{
const char *beg, *end;
DEBUGASSERT(server_cert);
beg = (const char *)server_cert->raw.p;
end = beg + server_cert->raw.len;
return Curl_extract_certinfo(data, idx, beg, end);
}
static CURLcode collect_server_cert(struct Curl_cfilter *cf,
struct Curl_easy *data,
const struct mbedtls_x509_crt *peercert)
{
#ifndef CURL_DISABLE_VERBOSE_STRINGS
const bool show_verbose_server_cert = data->set.verbose;
#else
const bool show_verbose_server_cert = false;
#endif
struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
CURLcode result = CURLE_PEER_FAILED_VERIFICATION;
int i, count;
if(!show_verbose_server_cert && !ssl_config->certinfo)
return CURLE_OK;
if(!peercert)
return result;
count = count_server_cert(peercert);
result = Curl_ssl_init_certinfo(data, count);
for(i = 0 ; !result && peercert ; i++) {
result = collect_server_cert_single(data, peercert, i);
peercert = peercert->next;
}
return result;
}
static CURLcode
mbed_connect_step2(struct Curl_cfilter *cf, struct Curl_easy *data)
{
int ret;
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
const mbedtls_x509_crt *peercert;
#ifndef CURL_DISABLE_PROXY
const char * const pinnedpubkey = Curl_ssl_cf_is_proxy(cf)?
data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY]:
data->set.str[STRING_SSL_PINNEDPUBLICKEY];
#else
const char * const pinnedpubkey = data->set.str[STRING_SSL_PINNEDPUBLICKEY];
#endif
DEBUGASSERT(backend);
ret = mbedtls_ssl_handshake(&backend->ssl);
if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
connssl->io_need = CURL_SSL_IO_NEED_RECV;
return CURLE_OK;
}
else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
connssl->io_need = CURL_SSL_IO_NEED_SEND;
return CURLE_OK;
}
else if(ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED) {
failf(data, "peer certificate could not be verified");
return CURLE_PEER_FAILED_VERIFICATION;
}
else if(ret) {
char errorbuf[128];
CURL_TRC_CF(data, cf, "TLS version %04X",
mbedtls_ssl_get_version_number(&backend->ssl));
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "ssl_handshake returned: (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CONNECT_ERROR;
}
#if MBEDTLS_VERSION_NUMBER >= 0x03020000
{
char cipher_str[64];
uint16_t cipher_id;
cipher_id = (uint16_t)
mbedtls_ssl_get_ciphersuite_id_from_ssl(&backend->ssl);
mbed_cipher_suite_get_str(cipher_id, cipher_str, sizeof(cipher_str), true);
infof(data, "mbedTLS: Handshake complete, cipher is %s", cipher_str);
}
#else
infof(data, "mbedTLS: Handshake complete");
#endif
ret = mbedtls_ssl_get_verify_result(&backend->ssl);
if(!conn_config->verifyhost)
/* Ignore hostname errors if verifyhost is disabled */
ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH;
if(ret && conn_config->verifypeer) {
if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
failf(data, "Cert verify failed: BADCERT_EXPIRED");
else if(ret & MBEDTLS_X509_BADCERT_REVOKED)
failf(data, "Cert verify failed: BADCERT_REVOKED");
else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
else if(ret & MBEDTLS_X509_BADCERT_FUTURE)
failf(data, "Cert verify failed: BADCERT_FUTURE");
return CURLE_PEER_FAILED_VERIFICATION;
}
peercert = mbedtls_ssl_get_peer_cert(&backend->ssl);
if(peercert) {
const CURLcode result = collect_server_cert(cf, data, peercert);
if(result)
return result;
}
if(peercert && data->set.verbose) {
#ifndef MBEDTLS_X509_REMOVE_INFO
const size_t bufsize = 16384;
char *buffer = malloc(bufsize);
if(!buffer)
return CURLE_OUT_OF_MEMORY;
if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0)
infof(data, "Dumping cert info: %s", buffer);
else
infof(data, "Unable to dump certificate information");
free(buffer);
#else
infof(data, "Unable to dump certificate information");
#endif
}
if(pinnedpubkey) {
int size;
CURLcode result;
mbedtls_x509_crt *p = NULL;
unsigned char *pubkey = NULL;
#if MBEDTLS_VERSION_NUMBER == 0x03000000
if(!peercert || !peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(p) ||
!peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(len)) {
#else
if(!peercert || !peercert->raw.p || !peercert->raw.len) {
#endif
failf(data, "Failed due to missing peer certificate");
return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
}
p = calloc(1, sizeof(*p));
if(!p)
return CURLE_OUT_OF_MEMORY;
pubkey = malloc(PUB_DER_MAX_BYTES);
if(!pubkey) {
result = CURLE_OUT_OF_MEMORY;
goto pinnedpubkey_error;
}
mbedtls_x509_crt_init(p);
/* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der
needs a non-const key, for now.
https://github.com/ARMmbed/mbedtls/issues/396 */
#if MBEDTLS_VERSION_NUMBER == 0x03000000
if(mbedtls_x509_crt_parse_der(p,
peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(p),
peercert->MBEDTLS_PRIVATE(raw).MBEDTLS_PRIVATE(len))) {
#else
if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
#endif
failf(data, "Failed copying peer certificate");
result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
goto pinnedpubkey_error;
}
#if MBEDTLS_VERSION_NUMBER == 0x03000000
size = mbedtls_pk_write_pubkey_der(&p->MBEDTLS_PRIVATE(pk), pubkey,
PUB_DER_MAX_BYTES);
#else
size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
#endif
if(size <= 0) {
failf(data, "Failed copying public key from peer certificate");
result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
goto pinnedpubkey_error;
}
/* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */
result = Curl_pin_peer_pubkey(data,
pinnedpubkey,
&pubkey[PUB_DER_MAX_BYTES - size], size);
pinnedpubkey_error:
mbedtls_x509_crt_free(p);
free(p);
free(pubkey);
if(result) {
return result;
}
}
#ifdef HAS_ALPN
if(connssl->alpn) {
const char *proto = mbedtls_ssl_get_alpn_protocol(&backend->ssl);
Curl_alpn_set_negotiated(cf, data, (const unsigned char *)proto,
proto? strlen(proto) : 0);
}
#endif
connssl->connecting_state = ssl_connect_3;
infof(data, "SSL connected");
return CURLE_OK;
}
static void mbedtls_session_free(void *sessionid, size_t idsize)
{
(void)idsize;
mbedtls_ssl_session_free(sessionid);
free(sessionid);
}
static CURLcode
mbed_connect_step3(struct Curl_cfilter *cf, struct Curl_easy *data)
{
CURLcode retcode = CURLE_OK;
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
DEBUGASSERT(backend);
if(ssl_config->primary.sessionid) {
int ret;
mbedtls_ssl_session *our_ssl_sessionid;
void *old_ssl_sessionid = NULL;
our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session));
if(!our_ssl_sessionid)
return CURLE_OUT_OF_MEMORY;
mbedtls_ssl_session_init(our_ssl_sessionid);
ret = mbedtls_ssl_get_session(&backend->ssl, our_ssl_sessionid);
if(ret) {
if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED)
mbedtls_ssl_session_free(our_ssl_sessionid);
free(our_ssl_sessionid);
failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret);
return CURLE_SSL_CONNECT_ERROR;
}
/* If there's already a matching session in the cache, delete it */
Curl_ssl_sessionid_lock(data);
if(!Curl_ssl_getsessionid(cf, data, &connssl->peer,
&old_ssl_sessionid, NULL))
Curl_ssl_delsessionid(data, old_ssl_sessionid);
retcode = Curl_ssl_addsessionid(cf, data, &connssl->peer,
our_ssl_sessionid, 0,
mbedtls_session_free);
Curl_ssl_sessionid_unlock(data);
if(retcode)
return retcode;
}
connssl->connecting_state = ssl_connect_done;
return CURLE_OK;
}
static ssize_t mbed_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *mem, size_t len,
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
int ret = -1;
(void)data;
DEBUGASSERT(backend);
ret = mbedtls_ssl_write(&backend->ssl, (unsigned char *)mem, len);
if(ret < 0) {
CURL_TRC_CF(data, cf, "mbedtls_ssl_write(len=%zu) -> -0x%04X",
len, -ret);
*curlcode = ((ret == MBEDTLS_ERR_SSL_WANT_WRITE)
#ifdef TLS13_SUPPORT
|| (ret == MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET)
#endif
)? CURLE_AGAIN : CURLE_SEND_ERROR;
ret = -1;
}
return ret;
}
static void mbedtls_close_all(struct Curl_easy *data)
{
(void)data;
}
static CURLcode mbedtls_shutdown(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool send_shutdown, bool *done)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
unsigned char buf[1024];
CURLcode result = CURLE_OK;
int ret;
size_t i;
DEBUGASSERT(backend);
if(!backend->initialized || cf->shutdown) {
*done = TRUE;
return CURLE_OK;
}
connssl->io_need = CURL_SSL_IO_NEED_NONE;
*done = FALSE;
if(!backend->sent_shutdown) {
/* do this only once */
backend->sent_shutdown = TRUE;
if(send_shutdown) {
ret = mbedtls_ssl_close_notify(&backend->ssl);
switch(ret) {
case 0: /* we sent it, receive from the server */
break;
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY: /* server also closed */
*done = TRUE;
goto out;
case MBEDTLS_ERR_SSL_WANT_READ:
connssl->io_need = CURL_SSL_IO_NEED_RECV;
goto out;
case MBEDTLS_ERR_SSL_WANT_WRITE:
connssl->io_need = CURL_SSL_IO_NEED_SEND;
goto out;
default:
CURL_TRC_CF(data, cf, "mbedtls_shutdown error -0x%04X", -ret);
result = CURLE_RECV_ERROR;
goto out;
}
}
}
/* SSL should now have started the shutdown from our side. Since it
* was not complete, we are lacking the close notify from the server. */
for(i = 0; i < 10; ++i) {
ret = mbedtls_ssl_read(&backend->ssl, buf, sizeof(buf));
/* This seems to be a bug in mbedTLS TLSv1.3 where it reports
* WANT_READ, but has not encountered an EAGAIN. */
if(ret == MBEDTLS_ERR_SSL_WANT_READ)
ret = mbedtls_ssl_read(&backend->ssl, buf, sizeof(buf));
#ifdef TLS13_SUPPORT
if(ret == MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET)
continue;
#endif
if(ret <= 0)
break;
}
if(ret > 0) {
/* still data coming in? */
CURL_TRC_CF(data, cf, "mbedtls_shutdown, still getting data");
}
else if(ret == 0 || (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)) {
/* We got the close notify alert and are done. */
CURL_TRC_CF(data, cf, "mbedtls_shutdown done");
*done = TRUE;
}
else if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
CURL_TRC_CF(data, cf, "mbedtls_shutdown, need RECV");
connssl->io_need = CURL_SSL_IO_NEED_RECV;
}
else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
CURL_TRC_CF(data, cf, "mbedtls_shutdown, need SEND");
connssl->io_need = CURL_SSL_IO_NEED_SEND;
}
else {
CURL_TRC_CF(data, cf, "mbedtls_shutdown error -0x%04X", -ret);
result = CURLE_RECV_ERROR;
}
out:
cf->shutdown = (result || *done);
return result;
}
static void mbedtls_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
(void)data;
DEBUGASSERT(backend);
if(backend->initialized) {
mbedtls_pk_free(&backend->pk);
mbedtls_x509_crt_free(&backend->clicert);
mbedtls_x509_crt_free(&backend->cacert);
#ifdef MBEDTLS_X509_CRL_PARSE_C
mbedtls_x509_crl_free(&backend->crl);
#endif
Curl_safefree(backend->ciphersuites);
mbedtls_ssl_config_free(&backend->config);
mbedtls_ssl_free(&backend->ssl);
mbedtls_ctr_drbg_free(&backend->ctr_drbg);
#ifndef THREADING_SUPPORT
mbedtls_entropy_free(&backend->entropy);
#endif /* THREADING_SUPPORT */
backend->initialized = FALSE;
}
}
static ssize_t mbed_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t buffersize,
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = cf->ctx;
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
int ret = -1;
ssize_t len = -1;
(void)data;
DEBUGASSERT(backend);
ret = mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf,
buffersize);
if(ret <= 0) {
CURL_TRC_CF(data, cf, "mbedtls_ssl_read(len=%zu) -> -0x%04X",
buffersize, -ret);
if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
return 0;
*curlcode = ((ret == MBEDTLS_ERR_SSL_WANT_READ)
#ifdef TLS13_SUPPORT
|| (ret == MBEDTLS_ERR_SSL_RECEIVED_NEW_SESSION_TICKET)
#endif
) ? CURLE_AGAIN : CURLE_RECV_ERROR;
if(*curlcode != CURLE_AGAIN) {
char errorbuf[128];
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "ssl_read returned: (-0x%04X) %s", -ret, errorbuf);
}
return -1;
}
len = ret;
return len;
}
static size_t mbedtls_version(char *buffer, size_t size)
{
#ifdef MBEDTLS_VERSION_C
/* if mbedtls_version_get_number() is available it is better */
unsigned int version = mbedtls_version_get_number();
return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
(version>>16)&0xff, (version>>8)&0xff);
#else
return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING);
#endif
}
static CURLcode mbedtls_random(struct Curl_easy *data,
unsigned char *entropy, size_t length)
{
#if defined(MBEDTLS_CTR_DRBG_C)
int ret = -1;
char errorbuf[128];
mbedtls_entropy_context ctr_entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_init(&ctr_entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
&ctr_entropy, NULL, 0);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "mbedtls_ctr_drbg_seed returned (-0x%04X) %s",
-ret, errorbuf);
}
else {
ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
if(ret) {
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
failf(data, "mbedtls_ctr_drbg_random returned (-0x%04X) %s",
-ret, errorbuf);
}
}
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&ctr_entropy);
return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT;
#elif defined(MBEDTLS_HAVEGE_C)
mbedtls_havege_state hs;
mbedtls_havege_init(&hs);
mbedtls_havege_random(&hs, entropy, length);
mbedtls_havege_free(&hs);
return CURLE_OK;
#else
return CURLE_NOT_BUILT_IN;
#endif
}
static CURLcode
mbed_connect_common(struct Curl_cfilter *cf, struct Curl_easy *data,
bool nonblocking,
bool *done)
{
CURLcode retcode;
struct ssl_connect_data *connssl = cf->ctx;
curl_socket_t sockfd = Curl_conn_cf_get_socket(cf, data);
timediff_t timeout_ms;
int what;
/* check if the connection has already been established */
if(ssl_connection_complete == connssl->state) {
*done = TRUE;
return CURLE_OK;
}
if(ssl_connect_1 == connssl->connecting_state) {
/* Find out how much more time we're allowed */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
retcode = mbed_connect_step1(cf, data);
if(retcode)
return retcode;
}
while(ssl_connect_2 == connssl->connecting_state) {
/* check allowed time left */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
/* if ssl is expecting something, check if it's available. */
if(connssl->io_need) {
curl_socket_t writefd = (connssl->io_need & CURL_SSL_IO_NEED_SEND)?
sockfd:CURL_SOCKET_BAD;
curl_socket_t readfd = (connssl->io_need & CURL_SSL_IO_NEED_RECV)?
sockfd:CURL_SOCKET_BAD;
what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
nonblocking ? 0 : timeout_ms);
if(what < 0) {
/* fatal error */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
return CURLE_SSL_CONNECT_ERROR;
}
else if(0 == what) {
if(nonblocking) {
*done = FALSE;
return CURLE_OK;
}
else {
/* timeout */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
}
/* socket is readable or writable */
}
/* Run transaction, and return to the caller if it failed or if
* this connection is part of a multi handle and this loop would
* execute again. This permits the owner of a multi handle to
* abort a connection attempt before step2 has completed while
* ensuring that a client using select() or epoll() will always
* have a valid fdset to wait on.
*/
connssl->io_need = CURL_SSL_IO_NEED_NONE;
retcode = mbed_connect_step2(cf, data);
if(retcode ||
(nonblocking && (ssl_connect_2 == connssl->connecting_state)))
return retcode;
} /* repeat step2 until all transactions are done. */
if(ssl_connect_3 == connssl->connecting_state) {
retcode = mbed_connect_step3(cf, data);
if(retcode)
return retcode;
}
if(ssl_connect_done == connssl->connecting_state) {
connssl->state = ssl_connection_complete;
*done = TRUE;
}
else
*done = FALSE;
/* Reset our connect state machine */
connssl->connecting_state = ssl_connect_1;
return CURLE_OK;
}
static CURLcode mbedtls_connect_nonblocking(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool *done)
{
return mbed_connect_common(cf, data, TRUE, done);
}
static CURLcode mbedtls_connect(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
CURLcode retcode;
bool done = FALSE;
retcode = mbed_connect_common(cf, data, FALSE, &done);
if(retcode)
return retcode;
DEBUGASSERT(done);
return CURLE_OK;
}
/*
* return 0 error initializing SSL
* return 1 SSL initialized successfully
*/
static int mbedtls_init(void)
{
if(!Curl_mbedtlsthreadlock_thread_setup())
return 0;
#ifdef THREADING_SUPPORT
entropy_init_mutex(&ts_entropy);
#endif
return 1;
}
static void mbedtls_cleanup(void)
{
#ifdef THREADING_SUPPORT
entropy_cleanup_mutex(&ts_entropy);
#endif
(void)Curl_mbedtlsthreadlock_thread_cleanup();
}
static bool mbedtls_data_pending(struct Curl_cfilter *cf,
const struct Curl_easy *data)
{
struct ssl_connect_data *ctx = cf->ctx;
struct mbed_ssl_backend_data *backend;
(void)data;
DEBUGASSERT(ctx && ctx->backend);
backend = (struct mbed_ssl_backend_data *)ctx->backend;
return mbedtls_ssl_get_bytes_avail(&backend->ssl) != 0;
}
static CURLcode mbedtls_sha256sum(const unsigned char *input,
size_t inputlen,
unsigned char *sha256sum,
size_t sha256len UNUSED_PARAM)
{
/* TODO: explain this for different mbedtls 2.x vs 3 version */
(void)sha256len;
#if MBEDTLS_VERSION_NUMBER < 0x02070000
mbedtls_sha256(input, inputlen, sha256sum, 0);
#else
/* returns 0 on success, otherwise failure */
#if MBEDTLS_VERSION_NUMBER >= 0x03000000
if(mbedtls_sha256(input, inputlen, sha256sum, 0) != 0)
#else
if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
#endif
return CURLE_BAD_FUNCTION_ARGUMENT;
#endif
return CURLE_OK;
}
static void *mbedtls_get_internals(struct ssl_connect_data *connssl,
CURLINFO info UNUSED_PARAM)
{
struct mbed_ssl_backend_data *backend =
(struct mbed_ssl_backend_data *)connssl->backend;
(void)info;
DEBUGASSERT(backend);
return &backend->ssl;
}
const struct Curl_ssl Curl_ssl_mbedtls = {
{ CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
SSLSUPP_CA_PATH |
SSLSUPP_CAINFO_BLOB |
SSLSUPP_CERTINFO |
SSLSUPP_PINNEDPUBKEY |
SSLSUPP_SSL_CTX |
SSLSUPP_HTTPS_PROXY,
sizeof(struct mbed_ssl_backend_data),
mbedtls_init, /* init */
mbedtls_cleanup, /* cleanup */
mbedtls_version, /* version */
Curl_none_check_cxn, /* check_cxn */
mbedtls_shutdown, /* shutdown */
mbedtls_data_pending, /* data_pending */
mbedtls_random, /* random */
Curl_none_cert_status_request, /* cert_status_request */
mbedtls_connect, /* connect */
mbedtls_connect_nonblocking, /* connect_nonblocking */
Curl_ssl_adjust_pollset, /* adjust_pollset */
mbedtls_get_internals, /* get_internals */
mbedtls_close, /* close_one */
mbedtls_close_all, /* close_all */
Curl_none_set_engine, /* set_engine */
Curl_none_set_engine_default, /* set_engine_default */
Curl_none_engines_list, /* engines_list */
Curl_none_false_start, /* false_start */
mbedtls_sha256sum, /* sha256sum */
NULL, /* associate_connection */
NULL, /* disassociate_connection */
mbed_recv, /* recv decrypted data */
mbed_send, /* send data to encrypt */
};
#endif /* USE_MBEDTLS */
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