mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-26 02:05:39 +01:00
Make verify_chain() iterative
This commit is contained in:
Manuel Pégourié-Gonnard
parent
f86f491f25
commit
ce6e52ff42
@ -2071,11 +2071,9 @@ static int x509_crt_check_ee_locally_trusted(
|
||||
* -> return that chain with NOT_TRUSTED set on Ciq
|
||||
*
|
||||
* Arguments:
|
||||
* - child: the current bottom of the chain to verify
|
||||
* - trust_ca, ca_crl, profile: as in verify_with_profile()
|
||||
* - top: 1 if child is known to be locally trusted
|
||||
* - path_cnt: current depth as passed to f_vrfy() (EE = 0, etc)
|
||||
* - self_cnt: number of self-issued certs seen so far in the chain
|
||||
* - [in] crt: the cert list EE, C1, ..., Cn
|
||||
* - [in] trust_ca: the trusted list R1, ..., Rp
|
||||
* - [in] ca_crl, profile: as in verify_with_profile()
|
||||
* - [out] ver_chain: the built and verified chain
|
||||
*
|
||||
* Return value:
|
||||
@ -2084,88 +2082,99 @@ static int x509_crt_check_ee_locally_trusted(
|
||||
* even if it was found to be invalid
|
||||
*/
|
||||
static int x509_crt_verify_chain(
|
||||
mbedtls_x509_crt *child,
|
||||
mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl,
|
||||
mbedtls_x509_crt *crt,
|
||||
mbedtls_x509_crt *trust_ca,
|
||||
mbedtls_x509_crl *ca_crl,
|
||||
const mbedtls_x509_crt_profile *profile,
|
||||
int top, int path_cnt, int self_cnt,
|
||||
x509_crt_verify_chain_item ver_chain[X509_MAX_VERIFY_CHAIN_SIZE] )
|
||||
{
|
||||
uint32_t *flags;
|
||||
mbedtls_x509_crt *child;
|
||||
mbedtls_x509_crt *parent;
|
||||
int parent_is_trusted = 0;
|
||||
int child_is_trusted = 0;
|
||||
int path_cnt = 0;
|
||||
int self_cnt = 0;
|
||||
|
||||
/* Add certificate to the verification chain */
|
||||
ver_chain[path_cnt].crt = child;
|
||||
flags = &ver_chain[path_cnt].flags;
|
||||
child = crt;
|
||||
|
||||
/* Check time-validity (all certificates) */
|
||||
if( mbedtls_x509_time_is_past( &child->valid_to ) )
|
||||
*flags |= MBEDTLS_X509_BADCERT_EXPIRED;
|
||||
while( 1 ) {
|
||||
/* Add certificate to the verification chain */
|
||||
ver_chain[path_cnt].crt = child;
|
||||
flags = &ver_chain[path_cnt].flags;
|
||||
|
||||
if( mbedtls_x509_time_is_future( &child->valid_from ) )
|
||||
*flags |= MBEDTLS_X509_BADCERT_FUTURE;
|
||||
/* Check time-validity (all certificates) */
|
||||
if( mbedtls_x509_time_is_past( &child->valid_to ) )
|
||||
*flags |= MBEDTLS_X509_BADCERT_EXPIRED;
|
||||
|
||||
/* Stop here for trusted roots (but not for trusted EE certs) */
|
||||
if( top )
|
||||
return( 0 );
|
||||
if( mbedtls_x509_time_is_future( &child->valid_from ) )
|
||||
*flags |= MBEDTLS_X509_BADCERT_FUTURE;
|
||||
|
||||
/* Check signature algorithm: MD & PK algs */
|
||||
if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_MD;
|
||||
/* Stop here for trusted roots (but not for trusted EE certs) */
|
||||
if( child_is_trusted )
|
||||
return( 0 );
|
||||
|
||||
if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_PK;
|
||||
/* Check signature algorithm: MD & PK algs */
|
||||
if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_MD;
|
||||
|
||||
/* Special case: EE certs that are locally trusted */
|
||||
if( path_cnt == 0 &&
|
||||
x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
|
||||
{
|
||||
return( 0 );
|
||||
}
|
||||
if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_PK;
|
||||
|
||||
/* Look for a parent in trusted CAs or up the chain */
|
||||
parent = x509_crt_find_parent( child, trust_ca, &parent_is_trusted,
|
||||
path_cnt, self_cnt );
|
||||
/* Special case: EE certs that are locally trusted */
|
||||
if( path_cnt == 0 &&
|
||||
x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
|
||||
{
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* No parent? We're done here */
|
||||
if( parent == NULL )
|
||||
{
|
||||
*flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
|
||||
return( 0 );
|
||||
}
|
||||
/* Look for a parent in trusted CAs or up the chain */
|
||||
parent = x509_crt_find_parent( child, trust_ca, &parent_is_trusted,
|
||||
path_cnt, self_cnt );
|
||||
|
||||
/* Count intermediate self-issued (not necessarily self-signed) certs.
|
||||
* These can occur with some strategies for key rollover, see [SIRO],
|
||||
* and should be excluded from max_pathlen checks. */
|
||||
if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 )
|
||||
self_cnt++;
|
||||
/* No parent? We're done here */
|
||||
if( parent == NULL )
|
||||
{
|
||||
*flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/* path_cnt is 0 for the first intermediate CA,
|
||||
* and if parent is trusted it's not an intermediate CA */
|
||||
if( ! parent_is_trusted &&
|
||||
1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
|
||||
{
|
||||
/* return immediately to avoid overflow the chain array */
|
||||
return( MBEDTLS_ERR_X509_FATAL_ERROR );
|
||||
}
|
||||
/* Count intermediate self-issued (not necessarily self-signed) certs.
|
||||
* These can occur with some strategies for key rollover, see [SIRO],
|
||||
* and should be excluded from max_pathlen checks. */
|
||||
if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 )
|
||||
self_cnt++;
|
||||
|
||||
/* if parent is trusted, the signature was checked by find_parent() */
|
||||
if( ! parent_is_trusted && x509_crt_check_signature( child, parent ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
|
||||
/* path_cnt is 0 for the first intermediate CA,
|
||||
* and if parent is trusted it's not an intermediate CA */
|
||||
if( ! parent_is_trusted &&
|
||||
1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
|
||||
{
|
||||
/* return immediately to avoid overflow the chain array */
|
||||
return( MBEDTLS_ERR_X509_FATAL_ERROR );
|
||||
}
|
||||
|
||||
/* check size of signing key */
|
||||
if( x509_profile_check_key( profile, child->sig_pk, &parent->pk ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
|
||||
/* if parent is trusted, the signature was checked by find_parent() */
|
||||
if( ! parent_is_trusted && x509_crt_check_signature( child, parent ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
|
||||
|
||||
/* check size of signing key */
|
||||
if( x509_profile_check_key( profile, child->sig_pk, &parent->pk ) != 0 )
|
||||
*flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
|
||||
|
||||
#if defined(MBEDTLS_X509_CRL_PARSE_C)
|
||||
/* Check trusted CA's CRL for the given crt */
|
||||
*flags |= x509_crt_verifycrl(child, parent, ca_crl, profile );
|
||||
/* Check trusted CA's CRL for the given crt */
|
||||
*flags |= x509_crt_verifycrl(child, parent, ca_crl, profile );
|
||||
#else
|
||||
(void) ca_crl;
|
||||
#endif
|
||||
|
||||
/* verify the rest of the chain starting from parent */
|
||||
return( x509_crt_verify_chain( parent, trust_ca, ca_crl, profile,
|
||||
parent_is_trusted, path_cnt + 1, self_cnt,
|
||||
ver_chain ) );
|
||||
/* prepare for next iteration */
|
||||
child = parent;
|
||||
parent = NULL;
|
||||
child_is_trusted = parent_is_trusted;
|
||||
++path_cnt;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2290,9 +2299,7 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
|
||||
*ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
|
||||
|
||||
/* Check the chain */
|
||||
ret = x509_crt_verify_chain( crt, trust_ca, ca_crl, profile,
|
||||
0, 0, 0,
|
||||
ver_chain );
|
||||
ret = x509_crt_verify_chain( crt, trust_ca, ca_crl, profile, ver_chain );
|
||||
if( ret != 0 )
|
||||
goto exit;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user