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Merge pull request #4447 from hanno-arm/ssl_config_cleanup

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Avoid and remove some SSL error codes for Mbed TLS 3.0
This commit is contained in:
Manuel Pégourié-Gonnard 2021-05-17 10:55:17 +02:00 committed by GitHub
commit 5605911fd3
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6 changed files with 43 additions and 24 deletions
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6
ChangeLog.d/ssl-error-code-cleanup.txt Normal file
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@ -0,0 +1,6 @@
API changes
* Remove SSL error codes `MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED`
and `MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH` which are never
returned from the public SSL API.
* Remove `MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE` and return
`MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL` instead.

20
docs/3.0-migration-guide.d/ssl-error-code-cleanup.md Normal file
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@ -0,0 +1,20 @@
Removal of some SSL error codes
-----------------------------------------------------------------
This affects users manually checking for the following error codes:
- `MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED`
- `MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH`
- `MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE`
Migration paths:
- `MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED` and `MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH`
should never be returned from Mbed TLS, and there is no need to check for it.
Users should simply remove manual checks for those codes, and let the Mbed TLS
team know if -- contrary to the team's understanding -- there is in fact a situation
where one of them was ever returned.
- `MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE` has been removed, and
`MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL` is returned instead if the user's own certificate
is too large to fit into the output buffers. Users should check for
`MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL` instead, and potentially compare the size of their
own certificate against the configured size of the output buffer to understand if
the error is due to an overly large certificate.

6
include/mbedtls/error.h
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@ -106,8 +106,10 @@
* HKDF 5 1 (Started from top)
* SSL 5 2 (Started from 0x5F00)
* CIPHER 6 8 (Started from 0x6080)
* SSL 6 24 (Started from top, plus 0x6000)
* SSL 7 32
* SSL 6 23 (Started from top, plus 0x6000, gaps at
* 0x6600)
* SSL 7 28 (Started from 0x7080, gaps at
* 0x7300, 0x7500, 0x7580, 0x7800)
*
* Module dependent error code (5 bits 0x.00.-0x.F8.)
*/

10
include/mbedtls/ssl.h
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@ -67,17 +67,17 @@
#define MBEDTLS_ERR_SSL_INVALID_MAC -0x7180 /**< Verification of the message MAC failed. */
#define MBEDTLS_ERR_SSL_INVALID_RECORD -0x7200 /**< An invalid SSL record was received. */
#define MBEDTLS_ERR_SSL_CONN_EOF -0x7280 /**< The connection indicated an EOF. */
#define MBEDTLS_ERR_SSL_UNKNOWN_CIPHER -0x7300 /**< An unknown cipher was received. */
/* NOTE: Error space gap */
#define MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN -0x7380 /**< The server has no ciphersuites in common with the client. */
#define MBEDTLS_ERR_SSL_NO_RNG -0x7400 /**< No RNG was provided to the SSL module. */
#define MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE -0x7480 /**< No client certification received from the client, but required by the authentication mode. */
#define MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE -0x7500 /**< Our own certificate(s) is/are too large to send in an SSL message. */
#define MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED -0x7580 /**< The own certificate is not set, but needed by the server. */
/* NOTE: Error space gap */
/* NOTE: Error space gap */
#define MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED -0x7600 /**< The own private key or pre-shared key is not set, but needed. */
#define MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED -0x7680 /**< No CA Chain is set, but required to operate. */
#define MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE -0x7700 /**< An unexpected message was received from our peer. */
#define MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE -0x7780 /**< A fatal alert message was received from our peer. */
#define MBEDTLS_ERR_SSL_PEER_VERIFY_FAILED -0x7800 /**< Verification of our peer failed. */
/* NOTE: Error space gap */
#define MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY -0x7880 /**< The peer notified us that the connection is going to be closed. */
#define MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO -0x7900 /**< Processing of the ClientHello handshake message failed. */
#define MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO -0x7980 /**< Processing of the ServerHello handshake message failed. */
@ -111,7 +111,7 @@
#define MBEDTLS_ERR_SSL_CLIENT_RECONNECT -0x6780 /**< The client initiated a reconnect from the same port. */
#define MBEDTLS_ERR_SSL_UNEXPECTED_RECORD -0x6700 /**< Record header looks valid but is not expected. */
#define MBEDTLS_ERR_SSL_NON_FATAL -0x6680 /**< The alert message received indicates a non-fatal error. */
#define MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH -0x6600 /**< Couldn't set the hash for verifying CertificateVerify */
/* NOTE: Error space gap */
#define MBEDTLS_ERR_SSL_CONTINUE_PROCESSING -0x6580 /**< Internal-only message signaling that further message-processing should be done */
#define MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS -0x6500 /**< The asynchronous operation is not completed yet. */
#define MBEDTLS_ERR_SSL_EARLY_MESSAGE -0x6480 /**< Internal-only message signaling that a message arrived early. */

10
library/error.c
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@ -374,18 +374,12 @@ const char * mbedtls_high_level_strerr( int error_code )
return( "SSL - An invalid SSL record was received" );
case -(MBEDTLS_ERR_SSL_CONN_EOF):
return( "SSL - The connection indicated an EOF" );
case -(MBEDTLS_ERR_SSL_UNKNOWN_CIPHER):
return( "SSL - An unknown cipher was received" );
case -(MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN):
return( "SSL - The server has no ciphersuites in common with the client" );
case -(MBEDTLS_ERR_SSL_NO_RNG):
return( "SSL - No RNG was provided to the SSL module" );
case -(MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE):
return( "SSL - No client certification received from the client, but required by the authentication mode" );
case -(MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE):
return( "SSL - Our own certificate(s) is/are too large to send in an SSL message" );
case -(MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED):
return( "SSL - The own certificate is not set, but needed by the server" );
case -(MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED):
return( "SSL - The own private key or pre-shared key is not set, but needed" );
case -(MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED):
@ -394,8 +388,6 @@ const char * mbedtls_high_level_strerr( int error_code )
return( "SSL - An unexpected message was received from our peer" );
case -(MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE):
return( "SSL - A fatal alert message was received from our peer" );
case -(MBEDTLS_ERR_SSL_PEER_VERIFY_FAILED):
return( "SSL - Verification of our peer failed" );
case -(MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY):
return( "SSL - The peer notified us that the connection is going to be closed" );
case -(MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO):
@ -462,8 +454,6 @@ const char * mbedtls_high_level_strerr( int error_code )
return( "SSL - Record header looks valid but is not expected" );
case -(MBEDTLS_ERR_SSL_NON_FATAL):
return( "SSL - The alert message received indicates a non-fatal error" );
case -(MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH):
return( "SSL - Couldn't set the hash for verifying CertificateVerify" );
case -(MBEDTLS_ERR_SSL_CONTINUE_PROCESSING):
return( "SSL - Internal-only message signaling that further message-processing should be done" );
case -(MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS):

15
library/ssl_tls.c
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@ -1936,8 +1936,9 @@ int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
{
if( mbedtls_ssl_own_cert( ssl ) == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
/* Should never happen because we shouldn't have picked the
* ciphersuite if we don't have a certificate. */
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
}
#endif
@ -1964,7 +1965,7 @@ int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %" MBEDTLS_PRINTF_SIZET
" > %" MBEDTLS_PRINTF_SIZET,
i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN ) );
return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
}
ssl->out_msg[i ] = (unsigned char)( n >> 16 );
@ -6973,14 +6974,14 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
return( -1 );
switch( md )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
return( -1 );
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:
@ -6999,7 +7000,7 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
break;
#endif
default:
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
return( -1 );
}
return 0;
@ -7007,7 +7008,7 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
(void) ssl;
(void) md;
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
return( -1 );
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
}