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Take shortcut for directly trusted EE cert

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This is a slight change of behaviour in that the previous condition was:
- same subject
- signature matches
while the new condition is:
- exact same certificate

However the documentation for mbedtls_x509_crt_verify() (note on trust_ca)
mentions the new condition, so code that respected the documentation will keep
working.

In addition, this is a bit faster as it doesn't check the self-signature
(which never needs to be checked for certs in the trusted list).
This commit is contained in:
Manuel Pégourié-Gonnard 2017-06-29 11:57:01 +02:00
parent c61e5c9304
commit 17f4a6a609
1 changed files with 10 additions and 19 deletions
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29
library/x509_crt.c
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@ -1924,7 +1924,6 @@ static int x509_crt_verify_top(
{ {
int ret; int ret;
uint32_t ca_flags = 0; uint32_t ca_flags = 0;
int check_path_cnt;
unsigned char hash[MBEDTLS_MD_MAX_SIZE]; unsigned char hash[MBEDTLS_MD_MAX_SIZE];
const mbedtls_md_info_t *md_info; const mbedtls_md_info_t *md_info;
mbedtls_x509_crt *future_past_ca = NULL; mbedtls_x509_crt *future_past_ca = NULL;
@ -1950,6 +1949,14 @@ static int x509_crt_verify_top(
if( trust_ca == NULL ) if( trust_ca == NULL )
goto callback; goto callback;
/* Special case #2: child == trust_ca: trust and that's it */
if( child->raw.len == trust_ca->raw.len &&
memcmp( child->raw.p, trust_ca->raw.p, child->raw.len ) == 0 )
{
*flags &= ~MBEDTLS_X509_BADCERT_NOT_TRUSTED;
goto callback;
}
md_info = mbedtls_md_info_from_type( child->sig_md ); md_info = mbedtls_md_info_from_type( child->sig_md );
if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 ) if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 )
{ {
@ -1963,22 +1970,9 @@ static int x509_crt_verify_top(
if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 ) if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 )
continue; continue;
check_path_cnt = path_cnt + 1;
/*
* Reduce check_path_cnt to check against if top of the chain is
* the same as the trusted CA
*/
if( child->subject_raw.len == trust_ca->subject_raw.len &&
memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
child->issuer_raw.len ) == 0 )
{
check_path_cnt--;
}
/* Self signed certificates do not count towards the limit */ /* Self signed certificates do not count towards the limit */
if( trust_ca->max_pathlen > 0 && if( trust_ca->max_pathlen > 0 &&
trust_ca->max_pathlen < check_path_cnt - self_cnt ) trust_ca->max_pathlen < 1 + path_cnt - self_cnt )
{ {
continue; continue;
} }
@ -2018,10 +2012,7 @@ static int x509_crt_verify_top(
* to the callback for any issues with validity and CRL presence for the * to the callback for any issues with validity and CRL presence for the
* trusted CA certificate. * trusted CA certificate.
*/ */
if( trust_ca != NULL && if( trust_ca != NULL )
( child->subject_raw.len != trust_ca->subject_raw.len ||
memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
child->issuer_raw.len ) != 0 ) )
{ {
#if defined(MBEDTLS_X509_CRL_PARSE_C) #if defined(MBEDTLS_X509_CRL_PARSE_C)
/* Check trusted CA's CRL for the chain's top crt */ /* Check trusted CA's CRL for the chain's top crt */