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Add cb to build dynamic linked list representation of SubjectAltName

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This commit adds a callback for use with `x509_subject_alt_name_traverse()`
which builds the legacy dynamically allocated linked list presentation
of the `SubjectAlternativeNames` extension while traversing the raw data.
This commit is contained in:
Hanno Becker 2019-02-21 13:32:31 +00:00
parent da410828f4
commit ad46219a88
1 changed files with 32 additions and 0 deletions
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32
library/x509_crt.c
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@ -517,6 +517,38 @@ static int x509_get_ext_key_usage( unsigned char **p,
*
* NOTE: we only parse and use dNSName at this point.
*/
static int x509_get_subject_alt_name_cb( void *ctx,
int tag,
unsigned char *data,
size_t data_len )
{
mbedtls_asn1_sequence **cur_ptr = (mbedtls_asn1_sequence **) ctx;
mbedtls_asn1_sequence *cur = *cur_ptr;
/* Skip everything but DNS name */
if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) )
return( 0 );
/* Allocate and assign next pointer */
if( cur->buf.p != NULL )
{
cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
{
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_ALLOC_FAILED );
}
cur = cur->next;
}
cur->buf.tag = tag;
cur->buf.p = data;
cur->buf.len = data_len;
*cur_ptr = cur;
return( 0 );
}
static int x509_subject_alt_name_traverse( unsigned char *p,
const unsigned char *end,
int (*cb)( void *ctx,