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Merge pull request #3150 from irwir/fix_ssl_srv

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Simplify checks in ssl_write_certificate_request
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Manuel Pégourié-Gonnard 2020-04-22 09:31:00 +02:00 committed by GitHub
commit 6bd4c79999
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1 changed files with 5 additions and 5 deletions
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library/ssl_srv.c
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@ -2841,7 +2841,7 @@ static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info; ssl->handshake->ciphersuite_info;
size_t dn_size, total_dn_size; /* excluding length bytes */ uint16_t dn_size, total_dn_size; /* excluding length bytes */
size_t ct_len, sa_len; /* including length bytes */ size_t ct_len, sa_len; /* including length bytes */
unsigned char *buf, *p; unsigned char *buf, *p;
const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
@ -2969,11 +2969,11 @@ static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
while( crt != NULL && crt->version != 0 ) while( crt != NULL && crt->version != 0 )
{ {
dn_size = crt->subject_raw.len; /* It follows from RFC 5280 A.1 that this length
* can be represented in at most 11 bits. */
dn_size = (uint16_t) crt->subject_raw.len;
if( end < p || if( end < p || (size_t)( end - p ) < 2 + (size_t) dn_size )
(size_t)( end - p ) < dn_size ||
(size_t)( end - p ) < 2 + dn_size )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
break; break;