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fix various issues

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fix comments, format and name conversion issues

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu 2021-09-01 12:57:29 +08:00
parent f171e836eb
commit 1bc2c1f1a3
3 changed files with 120 additions and 134 deletions
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6
include/mbedtls/ssl.h
View File

@ -484,9 +484,9 @@
#define MBEDTLS_TLS_EXT_ALPN 16 #define MBEDTLS_TLS_EXT_ALPN 16
#define MBEDTLS_TLS_EXT_SCT 18 /* RFC 6962 TLS 1.2 and 1.3 */ #define MBEDTLS_TLS_EXT_SCT 18 /* RFC 6962 TLS 1.2 and 1.3 */
#define MBEDTLS_TLS_EXT_CLI_CERT_TYPE 19 /* RFC 7250 TLS 1.3 */ #define MBEDTLS_TLS_EXT_CLI_CERT_TYPE 19 /* RFC 7250 TLS 1.2 and 1.3 */
#define MBEDTLS_TLS_EXT_SERV_CERT_TYPE 20 /* RFC 7250 TLS 1.3 */ #define MBEDTLS_TLS_EXT_SERV_CERT_TYPE 20 /* RFC 7250 TLS 1.2 and 1.3 */
#define MBEDTLS_TLS_EXT_PADDING 21 /* RFC 7685 TLS 1.3 */ #define MBEDTLS_TLS_EXT_PADDING 21 /* RFC 7685 TLS 1.2 and 1.3 */
#define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */ #define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */
#define MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */ #define MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET 0x0017 /* 23 */

232
library/ssl_tls13_client.c
View File

@ -54,25 +54,31 @@ static int ssl_tls13_write_supported_versions_ext( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported versions extension" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported versions extension" ) );
/* /*
* ExtensionType 2 * Reserve space for extension header.
* ExtensionLength 2 *
* VersionSLength 1 * extension_type 2
* Version 2 * extension_data_length 2
* version_length 1
* versions 2
*/ */
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 7 ); MBEDTLS_SSL_CHK_BUF_PTR( p, end, 7 );
/* Write Extension Type */ /* Write extension_type */
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, p, 0 ); MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, p, 0 );
/* Write Extension Length */ /* Write extension_data_length */
MBEDTLS_PUT_UINT16_BE( 3, p, 2 ); MBEDTLS_PUT_UINT16_BE( 3, p, 2 );
p += 4; p += 4;
/* Length of the SupportedVersions field data */ /* Length of versions */
*p++ = 0x2; *p++ = 0x2;
/* This implementation only supports a single TLS version, and only /* Write values of supported version.
* advertises a single value. *
* They are come from configuration values. And
* ssl_conf_check has valided the values.
*
* Currently, only one vesrion is advertised.
*/ */
mbedtls_ssl_write_version( ssl->conf->max_major_ver, mbedtls_ssl_write_version( ssl->conf->max_major_ver,
ssl->conf->max_minor_ver, ssl->conf->max_minor_ver,
@ -115,22 +121,22 @@ static int ssl_tls13_write_key_shares_ext( mbedtls_ssl_context *ssl,
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
/* Write ciphersuites /*
* Functions for writing ClientHello message.
*/
/* Write cipher_suites
* CipherSuite cipher_suites<2..2^16-2>; * CipherSuite cipher_suites<2..2^16-2>;
*/ */
static int ssl_tls13_write_client_hello_ciphersuites( static int ssl_tls13_write_client_hello_cipher_suites(
mbedtls_ssl_context *ssl, mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
unsigned char *end, unsigned char *end,
size_t *olen ) size_t *olen )
{ {
/* Ciphersuite-related variables */ const int *cipher_suite_list;
const int *ciphersuites; unsigned char *cipher_suites_start; /* start of the cipher_suite_list */
const mbedtls_ssl_ciphersuite_t *ciphersuite_info; unsigned char *cipher_suites_iter; /* iteration of the cipher_suite_list */
/* ciphersuite_start points to the start of size_t cipher_suites_len;
the ciphersuite list, i.e. to the length field*/
unsigned char *ciphersuite_start, *ciphersuite_iter;
size_t buf_len;
*olen = 0 ; *olen = 0 ;
@ -142,69 +148,70 @@ static int ssl_tls13_write_client_hello_ciphersuites(
* ( including secret key length ) and a hash to be used with * ( including secret key length ) and a hash to be used with
* HKDF, in descending order of client preference. * HKDF, in descending order of client preference.
*/ */
ciphersuites = ssl->conf->ciphersuite_list; cipher_suite_list = ssl->conf->ciphersuite_list;
/* Check available spaces for ciphersuite */ /* Check there is space for the cipher suite list length (2 bytes). */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 );
/* Write ciphersuites */ /* Write cipher_suite_list */
ciphersuite_start = buf + 2; cipher_suites_start = buf + 2;
ciphersuite_iter = ciphersuite_start; cipher_suites_iter = cipher_suites_start;
for ( size_t i = 0; ciphersuites[i] != 0; i++ ) for ( size_t i = 0; cipher_suite_list[i] != 0; i++ )
{ {
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] ); int cipher_suite = cipher_suite_list[i];
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( cipher_suite );
if( ciphersuite_info == NULL ) if( ciphersuite_info == NULL )
continue; continue;
if( ciphersuite_info->min_minor_ver != MBEDTLS_SSL_MINOR_VERSION_4 || if( ciphersuite_info->min_minor_ver != MBEDTLS_SSL_MINOR_VERSION_4 ||
ciphersuite_info->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_4 ) ciphersuite_info->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_4 )
continue; continue;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x, %s", MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x, %s",
(unsigned int) ciphersuites[i], (unsigned int) cipher_suite,
ciphersuite_info->name ) ); ciphersuite_info->name ) );
/* Check for available spaces */ /* Check there is space for the cipher suite identifier (2 bytes). */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 );
MBEDTLS_PUT_UINT16_BE( cipher_suite, cipher_suites_iter, 0 );
MBEDTLS_PUT_UINT16_BE( ciphersuites[i], ciphersuite_iter, 0 ); cipher_suites_iter += 2;
ciphersuite_iter += 2;
} }
buf_len = ciphersuite_iter - ciphersuite_start; /* Write the cipher_suite_list length in number of bytes */
cipher_suites_len = cipher_suites_iter - cipher_suites_start;
/* write ciphersuite buf length */ MBEDTLS_PUT_UINT16_BE( cipher_suites_len, buf, 0 );
MBEDTLS_PUT_UINT16_BE( buf_len, buf, 0 );
MBEDTLS_SSL_DEBUG_MSG( 3, MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, got %" MBEDTLS_PRINTF_SIZET " ciphersuites", ( "client hello, got %" MBEDTLS_PRINTF_SIZET " cipher suites",
buf_len/2 ) ); cipher_suites_len/2 ) );
*olen = ciphersuite_iter - buf; /* Output the total length of cipher_suites field. */
*olen = cipher_suites_iter - buf;
return( 0 ); return( 0 );
} }
/* Functions for writing ClientHello message */ /*
* Structure of ClientHello message:
*
* struct {
* ProtocolVersion legacy_version = 0x0303; // TLS v1.2
* Random random;
* opaque legacy_session_id<0..32>;
* CipherSuite cipher_suites<2..2^16-2>;
* opaque legacy_compression_methods<1..2^8-1>;
* Extension extensions<8..2^16-1>;
* } ClientHello;
*/
static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl, static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
unsigned char *buf, unsigned char *buf,
size_t buflen, size_t buflen,
size_t *len_with_binders ) size_t *olen )
{ {
/* Extensions */
/* extension_start
* Used during extension writing where the
* buffer pointer to the beginning of the
* extension list must be kept to write
* the total extension list size in the end.
*/
int ret; int ret;
unsigned char *extension_start; unsigned char *extension_start; /* Start of extensions buffer */
size_t cur_ext_len; /* Size of the current extension */ size_t cur_ext_len; /* Size of the current extension */
size_t total_ext_len; /* Size of list of extensions */ size_t total_ext_len; /* Size of list of extensions */
@ -212,94 +219,75 @@ static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
unsigned char *start = buf; unsigned char *start = buf;
unsigned char *end = buf + buflen; unsigned char *end = buf + buflen;
*len_with_binders = 0; *olen = 0;
/* Keeping track of the included extensions */
ssl->handshake->extensions_present = MBEDTLS_SSL_EXT_NONE;
/* NOTE:
* Even for DTLS 1.3, we are writing a TLS handshake header here.
* The actual DTLS 1.3 handshake header is inserted in
* the record writing routine mbedtls_ssl_write_record().
*
* For cTLS the length, and the version field
* are elided. The random bytes are shorter.
*/
if( ssl->conf->max_major_ver == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "configured max major version is invalid, "
"consider using mbedtls_ssl_config_defaults()" ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
/* No validation needed here. It has been done by ssl_conf_check() */
ssl->major_ver = ssl->conf->min_major_ver; ssl->major_ver = ssl->conf->min_major_ver;
ssl->minor_ver = ssl->conf->min_minor_ver; ssl->minor_ver = ssl->conf->min_minor_ver;
/* Write legacy_version /*
* Write legacy_version
* ProtocolVersion legacy_version = 0x0303; // TLS v1.2 * ProtocolVersion legacy_version = 0x0303; // TLS v1.2
*
* For TLS 1.3 we use the legacy version number {0x03, 0x03} * For TLS 1.3 we use the legacy version number {0x03, 0x03}
* instead of the true version number. * instead of the true version number.
*
* For DTLS 1.3 we use the legacy version number
* {254,253}.
*
* In cTLS the version number is elided.
*/ */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, CLIENT_HELLO_LEGACY_VERSION_LEN ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, CLIENT_HELLO_LEGACY_VERSION_LEN );
MBEDTLS_PUT_UINT16_BE( 0x0303, buf, 0 ); MBEDTLS_PUT_UINT16_BE( 0x0303, buf, 0 );
buf += CLIENT_HELLO_LEGACY_VERSION_LEN; buf += CLIENT_HELLO_LEGACY_VERSION_LEN;
/* Write random bytes /* Write the random bytes ( random ).*/
Random random
*/
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, CLIENT_HELLO_RANDOM_LEN ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, CLIENT_HELLO_RANDOM_LEN );
memcpy( buf, ssl->handshake->randbytes, CLIENT_HELLO_RANDOM_LEN ); memcpy( buf, ssl->handshake->randbytes, CLIENT_HELLO_RANDOM_LEN );
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes",
buf, CLIENT_HELLO_RANDOM_LEN ); buf, CLIENT_HELLO_RANDOM_LEN );
buf += CLIENT_HELLO_RANDOM_LEN; buf += CLIENT_HELLO_RANDOM_LEN;
/* Versions of TLS before TLS 1.3 supported a /*
* "session resumption" feature which has been merged with pre-shared * Write legacy_session_id
* keys in this version. A client which has a *
* cached session ID set by a pre-TLS 1.3 server SHOULD set this * Versions of TLS before TLS 1.3 supported a "session resumption" feature
* field to that value. In compatibility mode, * which has been merged with pre-shared keys in this version. A client
* this field MUST be non-empty, so a client not offering a * which has a cached session ID set by a pre-TLS 1.3 server SHOULD set
* pre-TLS 1.3 session MUST generate a new 32-byte value. This value * this field to that value. In compatibility mode, this field MUST be
* need not be random but SHOULD be unpredictable to avoid * non-empty, so a client not offering a pre-TLS 1.3 session MUST generate
* implementations fixating on a specific value ( also known as * a new 32-byte value. This value need not be random but SHOULD be
* ossification ). Otherwise, it MUST be set as a zero-length vector * unpredictable to avoid implementations fixating on a specific value
* ( i.e., a zero-valued single byte length field ). * ( also known as ossification ). Otherwise, it MUST be set as a zero-length
* vector ( i.e., a zero-valued single byte length field ).
*/ */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 1 ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 1 );
*buf++ = 0; /* session id length set to zero */ *buf++ = 0; /* session id length set to zero */
/* Write ciphersuites */ /* Write cipher_suites */
ret = ssl_tls13_write_client_hello_ciphersuites( ssl, buf, end, &cur_ext_len ); ret = ssl_tls13_write_client_hello_cipher_suites( ssl, buf, end, &cur_ext_len );
if( ret != 0) if( ret != 0)
return( ret ); return( ret );
buf += cur_ext_len; buf += cur_ext_len;
/* For every TLS 1.3 ClientHello, this vector MUST contain exactly /* Write legacy_compression_methods
*
* For every TLS 1.3 ClientHello, this vector MUST contain exactly
* one byte set to zero, which corresponds to the 'null' compression * one byte set to zero, which corresponds to the 'null' compression
* method in prior versions of TLS. * method in prior versions of TLS.
*
* For cTLS this field is elided.
*/ */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 ); MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 );
*buf++ = 1; *buf++ = 1;
*buf++ = MBEDTLS_SSL_COMPRESS_NULL; *buf++ = MBEDTLS_SSL_COMPRESS_NULL;
/* Write extensions */
/* Keeping track of the included extensions */
ssl->handshake->extensions_present = MBEDTLS_SSL_EXT_NONE;
/* First write extensions, then the total length */ /* First write extensions, then the total length */
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 2 );
extension_start = buf; extension_start = buf;
buf += 2; buf += 2;
/* Supported Versions Extension is mandatory with TLS 1.3. /* Write supported_versions extension
* *
* For cTLS we only need to provide it if there is more than one version * Supported Versions Extension is mandatory with TLS 1.3.
* and currently there is only one.
*/ */
ret = ssl_tls13_write_supported_versions_ext( ssl, buf, end, &cur_ext_len ); ret = ssl_tls13_write_supported_versions_ext( ssl, buf, end, &cur_ext_len );
if( ret != 0 ) if( ret != 0 )
@ -307,22 +295,18 @@ static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
buf += cur_ext_len; buf += cur_ext_len;
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/* The supported_groups and the key_share extensions are /* Write supported_groups extension
* REQUIRED for ECDHE ciphersuites. *
* It is REQUIRED for ECDHE cipher_suites.
*/ */
ret = ssl_tls13_write_supported_groups_ext( ssl, buf, end, &cur_ext_len ); ret = ssl_tls13_write_supported_groups_ext( ssl, buf, end, &cur_ext_len );
if( ret != 0 ) if( ret != 0 )
return( ret ); return( ret );
buf += cur_ext_len; buf += cur_ext_len;
/* The supported_signature_algorithms extension is REQUIRED for /* Write key_share extension
* certificate authenticated ciphersuites. */ *
ret = mbedtls_ssl_tls13_write_sig_alg_ext( ssl, buf, end, &cur_ext_len ); * We need to send the key shares under three conditions:
if( ret != 0 )
return( ret );
buf += cur_ext_len;
/* We need to send the key shares under three conditions:
* 1) A certificate-based ciphersuite is being offered. In this case * 1) A certificate-based ciphersuite is being offered. In this case
* supported_groups and supported_signature extensions have been * supported_groups and supported_signature extensions have been
* successfully added. * successfully added.
@ -331,27 +315,32 @@ static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
* 3) Or, in case all ciphers are supported ( which includes #1 and #2 * 3) Or, in case all ciphers are supported ( which includes #1 and #2
* from above ) * from above )
*/ */
ret = ssl_tls13_write_key_shares_ext( ssl, buf, end, &cur_ext_len ); ret = ssl_tls13_write_key_shares_ext( ssl, buf, end, &cur_ext_len );
if( ret != 0 ) if( ret != 0 )
return( ret ); return( ret );
buf += cur_ext_len; buf += cur_ext_len;
/* Write signature_algorithms extension
*
* It is REQUIRED for certificate authenticated cipher_suites.
*/
ret = mbedtls_ssl_tls13_write_sig_alg_ext( ssl, buf, end, &cur_ext_len );
if( ret != 0 )
return( ret );
buf += cur_ext_len;
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
/* Add more extensions here */ /* Add more extensions here */
/* Write the length of the list of extensions. */
total_ext_len = buf - extension_start - 2; total_ext_len = buf - extension_start - 2;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %" MBEDTLS_PRINTF_SIZET , MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %" MBEDTLS_PRINTF_SIZET ,
total_ext_len ) ); total_ext_len ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", extension_start, total_ext_len ); MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", extension_start, total_ext_len );
/* Write extension length */
MBEDTLS_PUT_UINT16_BE( total_ext_len, extension_start, 0 ); MBEDTLS_PUT_UINT16_BE( total_ext_len, extension_start, 0 );
extension_start += 2;
*len_with_binders = buf - start; *olen = buf - start;
return( 0 ); return( 0 );
} }
@ -384,17 +373,6 @@ static int ssl_tls13_prepare_client_hello( mbedtls_ssl_context *ssl )
/* /*
* Write ClientHello handshake message. * Write ClientHello handshake message.
*
* Structure of this message:
*
* struct {
* ProtocolVersion legacy_version = 0x0303; // TLS v1.2
* Random random;
* opaque legacy_session_id<0..32>;
* CipherSuite cipher_suites<2..2^16-2>;
* opaque legacy_compression_methods<1..2^8-1>;
* Extension extensions<8..2^16-1>;
* } ClientHello;
*/ */
static int ssl_tls13_write_client_hello( mbedtls_ssl_context *ssl ) static int ssl_tls13_write_client_hello( mbedtls_ssl_context *ssl )
{ {

8
library/ssl_tls13_generic.c
View File

@ -32,6 +32,13 @@ int mbedtls_ssl_tls13_start_handshake_msg( mbedtls_ssl_context *ssl,
unsigned char **buf, unsigned char **buf,
size_t *buflen ) size_t *buflen )
{ {
/*
* Reserve 4 bytes for hanshake header. ( Section 4,RFC 8446 )
* ...
* HandshakeType msg_type;
* uint24 length;
* ...
*/
*buf = ssl->out_msg + 4; *buf = ssl->out_msg + 4;
*buflen = MBEDTLS_SSL_OUT_CONTENT_LEN - 4; *buflen = MBEDTLS_SSL_OUT_CONTENT_LEN - 4;
@ -48,6 +55,7 @@ int mbedtls_ssl_tls13_finish_handshake_msg( mbedtls_ssl_context *ssl,
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
((void) buf_len); ((void) buf_len);
/* Add reserved 4 bytes for handshake header */
ssl->out_msglen = msg_len + 4; ssl->out_msglen = msg_len + 4;
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_write_handshake_msg_ext, ( ssl, 0 ) ); MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_write_handshake_msg_ext, ( ssl, 0 ) );