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curl/lib/vtls/mbedtls.c
Jay Satiro 2e5651a5ce vtls: fix ssl version "or later" behavior change for many backends 
- Treat CURL_SSLVERSION_MAX_NONE the same as
  CURL_SSLVERSION_MAX_DEFAULT. Prior to this change NONE would mean use
  the minimum version also as the maximum.

This is a follow-up to 6015cef which changed the behavior of setting
the SSL version so that the requested version would only be the minimum
and not the maximum. It appears it was (mostly) implemented in OpenSSL
but not other backends. In other words CURL_SSLVERSION_TLSv1_0 used to
mean use just TLS v1.0 and now it means use TLS v1.0 *or later*.

- Fix CURL_SSLVERSION_MAX_DEFAULT for OpenSSL.

Prior to this change CURL_SSLVERSION_MAX_DEFAULT with OpenSSL was
erroneously treated as always TLS 1.3, and would cause an error if
OpenSSL was built without TLS 1.3 support.

Co-authored-by: Daniel Gustafsson

Fixes https://github.com/curl/curl/issues/2969
Closes https://github.com/curl/curl/pull/3012
2018-09-20 14:12:25 -04:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
* Copyright (C) 2012 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* 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.haxx.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.
*
***************************************************************************/
/*
* 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
#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/certs.h>
#include <mbedtls/x509.h>
#include <mbedtls/error.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/sha256.h>
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "mbedtls.h"
#include "vtls.h"
#include "parsedate.h"
#include "connect.h" /* for the connect timeout */
#include "select.h"
#include "polarssl_threadlock.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
struct ssl_backend_data {
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_context entropy;
mbedtls_ssl_context ssl;
int server_fd;
mbedtls_x509_crt cacert;
mbedtls_x509_crt clicert;
mbedtls_x509_crl crl;
mbedtls_pk_context pk;
mbedtls_ssl_config config;
const char *protocols[3];
};
#define BACKEND connssl->backend
/* apply threading? */
#if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
#define THREADING_SUPPORT
#endif
#if defined(THREADING_SUPPORT)
static mbedtls_entropy_context ts_entropy;
static int entropy_init_initialized = 0;
/* start of entropy_init_mutex() */
static void entropy_init_mutex(mbedtls_entropy_context *ctx)
{
/* lock 0 = entropy_init_mutex() */
Curl_polarsslthreadlock_lock_function(0);
if(entropy_init_initialized == 0) {
mbedtls_entropy_init(ctx);
entropy_init_initialized = 1;
}
Curl_polarsslthreadlock_unlock_function(0);
}
/* end of entropy_init_mutex() */
/* start of entropy_func_mutex() */
static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
{
int ret;
/* lock 1 = entropy_func_mutex() */
Curl_polarsslthreadlock_lock_function(1);
ret = mbedtls_entropy_func(data, output, len);
Curl_polarsslthreadlock_unlock_function(1);
return ret;
}
/* end of entropy_func_mutex() */
#endif /* THREADING_SUPPORT */
/* Define this to enable lots of debugging for mbedTLS */
#undef MBEDTLS_DEBUG
#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 = NULL;
if(!context)
return;
data = (struct Curl_easy *)context;
infof(data, "%s", line);
(void) level;
}
#else
#endif
/* ALPN for http2? */
#ifdef USE_NGHTTP2
# undef HAS_ALPN
# ifdef MBEDTLS_SSL_ALPN
# define HAS_ALPN
# endif
#endif
/*
* 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)
static Curl_recv mbed_recv;
static Curl_send mbed_send;
static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
{
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;
}
return CURLE_SSL_CONNECT_ERROR;
}
static CURLcode
set_ssl_version_min_max(struct connectdata *conn, int sockindex)
{
struct Curl_easy *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_1;
int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_1;
long ssl_version = SSL_CONN_CONFIG(version);
long ssl_version_max = SSL_CONN_CONFIG(version_max);
CURLcode result = CURLE_OK;
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:
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
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;
}
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);
return result;
}
static CURLcode
mbed_connect_step1(struct connectdata *conn,
int sockindex)
{
struct Curl_easy *data = conn->data;
struct ssl_connect_data* connssl = &conn->ssl[sockindex];
const char * const ssl_cafile = SSL_CONN_CONFIG(CAfile);
const bool verifypeer = SSL_CONN_CONFIG(verifypeer);
const char * const ssl_capath = SSL_CONN_CONFIG(CApath);
char * const ssl_cert = SSL_SET_OPTION(cert);
const char * const ssl_crlfile = SSL_SET_OPTION(CRLfile);
const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
conn->host.name;
const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
int ret = -1;
char errorbuf[128];
errorbuf[0] = 0;
/* mbedTLS only supports SSLv3 and TLSv1 */
if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
failf(data, "mbedTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef THREADING_SUPPORT
entropy_init_mutex(&ts_entropy);
mbedtls_ctr_drbg_init(&BACKEND->ctr_drbg);
ret = mbedtls_ctr_drbg_seed(&BACKEND->ctr_drbg, entropy_func_mutex,
&ts_entropy, NULL, 0);
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
-ret, errorbuf);
}
#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) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
-ret, errorbuf);
}
#endif /* THREADING_SUPPORT */
/* Load the trusted CA */
mbedtls_x509_crt_init(&BACKEND->cacert);
if(ssl_cafile) {
ret = mbedtls_x509_crt_parse_file(&BACKEND->cacert, ssl_cafile);
if(ret<0) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s",
ssl_cafile, -ret, errorbuf);
if(verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
}
if(ssl_capath) {
ret = mbedtls_x509_crt_parse_path(&BACKEND->cacert, ssl_capath);
if(ret<0) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s",
ssl_capath, -ret, errorbuf);
if(verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
}
/* Load the client certificate */
mbedtls_x509_crt_init(&BACKEND->clicert);
if(ssl_cert) {
ret = mbedtls_x509_crt_parse_file(&BACKEND->clicert, ssl_cert);
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s",
ssl_cert, -ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
}
/* Load the client private key */
mbedtls_pk_init(&BACKEND->pk);
if(SSL_SET_OPTION(key)) {
ret = mbedtls_pk_parse_keyfile(&BACKEND->pk, SSL_SET_OPTION(key),
SSL_SET_OPTION(key_passwd));
if(ret == 0 && !mbedtls_pk_can_do(&BACKEND->pk, MBEDTLS_PK_RSA))
ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s",
SSL_SET_OPTION(key), -ret, errorbuf);
return CURLE_SSL_CERTPROBLEM;
}
}
/* Load the CRL */
mbedtls_x509_crl_init(&BACKEND->crl);
if(ssl_crlfile) {
ret = mbedtls_x509_crl_parse_file(&BACKEND->crl, ssl_crlfile);
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s",
ssl_crlfile, -ret, errorbuf);
return CURLE_SSL_CRL_BADFILE;
}
}
infof(data, "mbedTLS: Connecting to %s:%d\n", hostname, port);
mbedtls_ssl_config_init(&BACKEND->config);
mbedtls_ssl_init(&BACKEND->ssl);
if(mbedtls_ssl_setup(&BACKEND->ssl, &BACKEND->config)) {
failf(data, "mbedTLS: ssl_init failed");
return CURLE_SSL_CONNECT_ERROR;
}
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;
}
/* new profile with RSA min key len = 1024 ... */
mbedtls_ssl_conf_cert_profile(&BACKEND->config,
&mbedtls_x509_crt_profile_fr);
switch(SSL_CONN_CONFIG(version)) {
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
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\n");
break;
case CURL_SSLVERSION_SSLv3:
mbedtls_ssl_conf_min_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
MBEDTLS_SSL_MINOR_VERSION_0);
mbedtls_ssl_conf_max_version(&BACKEND->config, MBEDTLS_SSL_MAJOR_VERSION_3,
MBEDTLS_SSL_MINOR_VERSION_0);
infof(data, "mbedTLS: Set SSL version to SSLv3\n");
break;
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(conn, sockindex);
if(result != CURLE_OK)
return result;
break;
}
default:
failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
return CURLE_SSL_CONNECT_ERROR;
}
mbedtls_ssl_conf_authmode(&BACKEND->config, MBEDTLS_SSL_VERIFY_OPTIONAL);
mbedtls_ssl_conf_rng(&BACKEND->config, mbedtls_ctr_drbg_random,
&BACKEND->ctr_drbg);
mbedtls_ssl_set_bio(&BACKEND->ssl, &conn->sock[sockindex],
mbedtls_net_send,
mbedtls_net_recv,
NULL /* rev_timeout() */);
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_SET_OPTION(primary.sessionid)) {
void *old_session = NULL;
Curl_ssl_sessionid_lock(conn);
if(!Curl_ssl_getsessionid(conn, &old_session, NULL, sockindex)) {
ret = mbedtls_ssl_set_session(&BACKEND->ssl, old_session);
if(ret) {
Curl_ssl_sessionid_unlock(conn);
failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "mbedTLS re-using session\n");
}
Curl_ssl_sessionid_unlock(conn);
}
mbedtls_ssl_conf_ca_chain(&BACKEND->config,
&BACKEND->cacert,
&BACKEND->crl);
if(SSL_SET_OPTION(key)) {
mbedtls_ssl_conf_own_cert(&BACKEND->config,
&BACKEND->clicert, &BACKEND->pk);
}
if(mbedtls_ssl_set_hostname(&BACKEND->ssl, 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, "couldn't set hostname in mbedTLS");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef HAS_ALPN
if(conn->bits.tls_enable_alpn) {
const char **p = &BACKEND->protocols[0];
#ifdef USE_NGHTTP2
if(data->set.httpversion >= CURL_HTTP_VERSION_2)
*p++ = NGHTTP2_PROTO_VERSION_ID;
#endif
*p++ = ALPN_HTTP_1_1;
*p = NULL;
/* 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;
}
for(p = &BACKEND->protocols[0]; *p; ++p)
infof(data, "ALPN, offering %s\n", *p);
}
#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) {
ret = (*data->set.ssl.fsslctx)(data, &BACKEND->config,
data->set.ssl.fsslctxp);
if(ret) {
failf(data, "error signaled by ssl ctx callback");
return ret;
}
}
connssl->connecting_state = ssl_connect_2;
return CURLE_OK;
}
static CURLcode
mbed_connect_step2(struct connectdata *conn,
int sockindex)
{
int ret;
struct Curl_easy *data = conn->data;
struct ssl_connect_data* connssl = &conn->ssl[sockindex];
const mbedtls_x509_crt *peercert;
const char * const pinnedpubkey = SSL_IS_PROXY() ?
data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
#ifdef HAS_ALPN
const char *next_protocol;
#endif
char errorbuf[128];
errorbuf[0] = 0;
conn->recv[sockindex] = mbed_recv;
conn->send[sockindex] = mbed_send;
ret = mbedtls_ssl_handshake(&BACKEND->ssl);
if(ret == MBEDTLS_ERR_SSL_WANT_READ) {
connssl->connecting_state = ssl_connect_2_reading;
return CURLE_OK;
}
else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
connssl->connecting_state = ssl_connect_2_writing;
return CURLE_OK;
}
else if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s",
-ret, errorbuf);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "mbedTLS: Handshake complete, cipher is %s\n",
mbedtls_ssl_get_ciphersuite(&BACKEND->ssl)
);
ret = mbedtls_ssl_get_verify_result(&BACKEND->ssl);
if(ret && SSL_CONN_CONFIG(verifypeer)) {
if(ret & MBEDTLS_X509_BADCERT_EXPIRED)
failf(data, "Cert verify failed: BADCERT_EXPIRED");
if(ret & MBEDTLS_X509_BADCERT_REVOKED) {
failf(data, "Cert verify failed: BADCERT_REVOKED");
return CURLE_SSL_CACERT;
}
if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH)
failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
return CURLE_PEER_FAILED_VERIFICATION;
}
peercert = mbedtls_ssl_get_peer_cert(&BACKEND->ssl);
if(peercert && data->set.verbose) {
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:\n%s\n", buffer);
else
infof(data, "Unable to dump certificate information.\n");
free(buffer);
}
if(pinnedpubkey) {
int size;
CURLcode result;
mbedtls_x509_crt *p;
unsigned char pubkey[PUB_DER_MAX_BYTES];
if(!peercert || !peercert->raw.p || !peercert->raw.len) {
failf(data, "Failed due to missing peer certificate");
return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
}
p = calloc(1, sizeof(*p));
if(!p)
return CURLE_OUT_OF_MEMORY;
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_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) {
failf(data, "Failed copying peer certificate");
mbedtls_x509_crt_free(p);
free(p);
return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
}
size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES);
if(size <= 0) {
failf(data, "Failed copying public key from peer certificate");
mbedtls_x509_crt_free(p);
free(p);
return CURLE_SSL_PINNEDPUBKEYNOTMATCH;
}
/* 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);
if(result) {
mbedtls_x509_crt_free(p);
free(p);
return result;
}
mbedtls_x509_crt_free(p);
free(p);
}
#ifdef HAS_ALPN
if(conn->bits.tls_enable_alpn) {
next_protocol = mbedtls_ssl_get_alpn_protocol(&BACKEND->ssl);
if(next_protocol) {
infof(data, "ALPN, server accepted to use %s\n", next_protocol);
#ifdef USE_NGHTTP2
if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
NGHTTP2_PROTO_VERSION_ID_LEN) &&
!next_protocol[NGHTTP2_PROTO_VERSION_ID_LEN]) {
conn->negnpn = CURL_HTTP_VERSION_2;
}
else
#endif
if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH) &&
!next_protocol[ALPN_HTTP_1_1_LENGTH]) {
conn->negnpn = CURL_HTTP_VERSION_1_1;
}
}
else {
infof(data, "ALPN, server did not agree to a protocol\n");
}
}
#endif
connssl->connecting_state = ssl_connect_3;
infof(data, "SSL connected\n");
return CURLE_OK;
}
static CURLcode
mbed_connect_step3(struct connectdata *conn,
int sockindex)
{
CURLcode retcode = CURLE_OK;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct Curl_easy *data = conn->data;
DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
if(SSL_SET_OPTION(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) {
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(conn);
if(!Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, sockindex))
Curl_ssl_delsessionid(conn, old_ssl_sessionid);
retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 0, sockindex);
Curl_ssl_sessionid_unlock(conn);
if(retcode) {
free(our_ssl_sessionid);
failf(data, "failed to store ssl session");
return retcode;
}
}
connssl->connecting_state = ssl_connect_done;
return CURLE_OK;
}
static ssize_t mbed_send(struct connectdata *conn, int sockindex,
const void *mem, size_t len,
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
int ret = -1;
ret = mbedtls_ssl_write(&BACKEND->ssl,
(unsigned char *)mem, len);
if(ret < 0) {
*curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ?
CURLE_AGAIN : CURLE_SEND_ERROR;
ret = -1;
}
return ret;
}
static void Curl_mbedtls_close_all(struct Curl_easy *data)
{
(void)data;
}
static void Curl_mbedtls_close(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
mbedtls_pk_free(&BACKEND->pk);
mbedtls_x509_crt_free(&BACKEND->clicert);
mbedtls_x509_crt_free(&BACKEND->cacert);
mbedtls_x509_crl_free(&BACKEND->crl);
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 */
}
static ssize_t mbed_recv(struct connectdata *conn, int num,
char *buf, size_t buffersize,
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = &conn->ssl[num];
int ret = -1;
ssize_t len = -1;
memset(buf, 0, buffersize);
ret = mbedtls_ssl_read(&BACKEND->ssl, (unsigned char *)buf,
buffersize);
if(ret <= 0) {
if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
return 0;
*curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ?
CURLE_AGAIN : CURLE_RECV_ERROR;
return -1;
}
len = ret;
return len;
}
static void Curl_mbedtls_session_free(void *ptr)
{
mbedtls_ssl_session_free(ptr);
free(ptr);
}
static size_t Curl_mbedtls_version(char *buffer, size_t size)
{
unsigned int version = mbedtls_version_get_number();
return snprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
(version>>16)&0xff, (version>>8)&0xff);
}
static CURLcode Curl_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);
errorbuf[0] = 0;
ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
&ctr_entropy, NULL, 0);
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s\n",
-ret, errorbuf);
}
else {
ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length);
if(ret) {
#ifdef MBEDTLS_ERROR_C
mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
#endif /* MBEDTLS_ERROR_C */
failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s\n",
-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 connectdata *conn,
int sockindex,
bool nonblocking,
bool *done)
{
CURLcode retcode;
struct Curl_easy *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
curl_socket_t sockfd = conn->sock[sockindex];
long 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(conn, sockindex);
if(retcode)
return retcode;
}
while(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == 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->connecting_state == ssl_connect_2_reading
|| connssl->connecting_state == ssl_connect_2_writing) {
curl_socket_t writefd = ssl_connect_2_writing ==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
curl_socket_t readfd = ssl_connect_2_reading ==
connssl->connecting_state?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.
*/
retcode = mbed_connect_step2(conn, sockindex);
if(retcode || (nonblocking &&
(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == connssl->connecting_state)))
return retcode;
} /* repeat step2 until all transactions are done. */
if(ssl_connect_3 == connssl->connecting_state) {
retcode = mbed_connect_step3(conn, sockindex);
if(retcode)
return retcode;
}
if(ssl_connect_done == connssl->connecting_state) {
connssl->state = ssl_connection_complete;
conn->recv[sockindex] = mbed_recv;
conn->send[sockindex] = mbed_send;
*done = TRUE;
}
else
*done = FALSE;
/* Reset our connect state machine */
connssl->connecting_state = ssl_connect_1;
return CURLE_OK;
}
static CURLcode Curl_mbedtls_connect_nonblocking(struct connectdata *conn,
int sockindex, bool *done)
{
return mbed_connect_common(conn, sockindex, TRUE, done);
}
static CURLcode Curl_mbedtls_connect(struct connectdata *conn, int sockindex)
{
CURLcode retcode;
bool done = FALSE;
retcode = mbed_connect_common(conn, sockindex, FALSE, &done);
if(retcode)
return retcode;
DEBUGASSERT(done);
return CURLE_OK;
}
/*
* return 0 error initializing SSL
* return 1 SSL initialized successfully
*/
static int Curl_mbedtls_init(void)
{
return Curl_polarsslthreadlock_thread_setup();
}
static void Curl_mbedtls_cleanup(void)
{
(void)Curl_polarsslthreadlock_thread_cleanup();
}
static bool Curl_mbedtls_data_pending(const struct connectdata *conn,
int sockindex)
{
const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
return mbedtls_ssl_get_bytes_avail(&BACKEND->ssl) != 0;
}
static CURLcode Curl_mbedtls_sha256sum(const unsigned char *input,
size_t inputlen,
unsigned char *sha256sum,
size_t sha256len UNUSED_PARAM)
{
(void)sha256len;
#if MBEDTLS_VERSION_NUMBER < 0x02070000
mbedtls_sha256(input, inputlen, sha256sum, 0);
#else
/* returns 0 on success, otherwise failure */
if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0)
return CURLE_BAD_FUNCTION_ARGUMENT;
#endif
return CURLE_OK;
}
static void *Curl_mbedtls_get_internals(struct ssl_connect_data *connssl,
CURLINFO info UNUSED_PARAM)
{
(void)info;
return &BACKEND->ssl;
}
const struct Curl_ssl Curl_ssl_mbedtls = {
{ CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */
SSLSUPP_CA_PATH |
SSLSUPP_PINNEDPUBKEY |
SSLSUPP_SSL_CTX,
sizeof(struct ssl_backend_data),
Curl_mbedtls_init, /* init */
Curl_mbedtls_cleanup, /* cleanup */
Curl_mbedtls_version, /* version */
Curl_none_check_cxn, /* check_cxn */
Curl_none_shutdown, /* shutdown */
Curl_mbedtls_data_pending, /* data_pending */
Curl_mbedtls_random, /* random */
Curl_none_cert_status_request, /* cert_status_request */
Curl_mbedtls_connect, /* connect */
Curl_mbedtls_connect_nonblocking, /* connect_nonblocking */
Curl_mbedtls_get_internals, /* get_internals */
Curl_mbedtls_close, /* close_one */
Curl_mbedtls_close_all, /* close_all */
Curl_mbedtls_session_free, /* session_free */
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 */
Curl_none_md5sum, /* md5sum */
Curl_mbedtls_sha256sum /* sha256sum */
};
#endif /* USE_MBEDTLS */
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