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Make use of cb to build linked list presentation of SubjectAltName

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This commit is contained in:
Hanno Becker 2019-02-21 14:46:54 +00:00
parent ad46219a88
commit 5984d30f4b
1 changed files with 8 additions and 72 deletions
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80
library/x509_crt.c
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@ -599,80 +599,13 @@ static int x509_subject_alt_name_traverse( unsigned char *p,
return( 0 );
}
static int x509_get_subject_alt_name( unsigned char **p,
static int x509_get_subject_alt_name( unsigned char *p,
const unsigned char *end,
mbedtls_x509_sequence *subject_alt_name )
{
int ret;
size_t len, tag_len;
mbedtls_asn1_buf *buf;
unsigned char tag;
mbedtls_asn1_sequence *cur = subject_alt_name;
/* Get main sequence tag */
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
if( *p + len != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
tag = **p;
(*p)++;
if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) !=
MBEDTLS_ASN1_CONTEXT_SPECIFIC )
{
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
}
/* Skip everything but DNS name */
if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) )
{
*p += tag_len;
continue;
}
/* Allocate and assign next pointer */
if( cur->buf.p != NULL )
{
if( cur->next != NULL )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
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;
}
buf = &(cur->buf);
buf->tag = tag;
buf->p = *p;
buf->len = tag_len;
*p += buf->len;
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if( *p != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
return( x509_subject_alt_name_traverse( p, end,
x509_get_subject_alt_name_cb,
(void*) &subject_alt_name ) );
}
/*
@ -793,9 +726,12 @@ static int x509_get_crt_ext( unsigned char **p,
/* Parse subject alt name */
crt->subject_alt_raw.p = *p;
crt->subject_alt_raw.len = end_ext_octet - *p;
if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
if( ( ret = x509_get_subject_alt_name( *p, end_ext_octet,
&crt->subject_alt_names ) ) != 0 )
{
return( ret );
}
*p = end_ext_octet;
break;
case MBEDTLS_X509_EXT_NS_CERT_TYPE: