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ASN.1: Reimplement mbedtls_asn1_get_sequence_of() via traversal API

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This commit is contained in:
Hanno Becker 2019-09-11 14:25:26 +01:00
parent 199b709e53
commit 1505f636a2
1 changed files with 40 additions and 43 deletions
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83
library/asn1parse.c
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@ -332,6 +332,41 @@ void mbedtls_asn1_sequence_free( mbedtls_asn1_sequence *seq )
}
}
typedef struct
{
int tag;
mbedtls_asn1_sequence *cur;
} asn1_get_sequence_of_cb_ctx_t;
static int asn1_get_sequence_of_cb( void *ctx,
int tag,
unsigned char *start,
size_t len )
{
asn1_get_sequence_of_cb_ctx_t *cb_ctx =
(asn1_get_sequence_of_cb_ctx_t *) ctx;
mbedtls_asn1_sequence *cur =
cb_ctx->cur;
if( cur->buf.p != NULL )
{
cur->next =
mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
cur = cur->next;
}
cur->buf.p = start;
cur->buf.len = len;
cur->buf.tag = tag;
cb_ctx->cur = cur;
return( 0 );
}
/*
* Parses and splits an ASN.1 "SEQUENCE OF <tag>"
*/
@ -340,49 +375,11 @@ int mbedtls_asn1_get_sequence_of( unsigned char **p,
mbedtls_asn1_sequence *cur,
int tag)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
mbedtls_asn1_buf *buf;
/* Get main sequence tag */
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( ret );
if( *p + len != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
buf = &(cur->buf);
buf->tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
return( ret );
buf->p = *p;
*p += buf->len;
/* Allocate and assign next pointer */
if( *p < end )
{
cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
cur = cur->next;
}
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if( *p != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
asn1_get_sequence_of_cb_ctx_t cb_ctx = { tag, cur };
memset( cur, 0, sizeof( mbedtls_asn1_sequence ) );
return( mbedtls_asn1_traverse_sequence_of(
p, end, 0xFF, tag, 0, 0,
asn1_get_sequence_of_cb, &cb_ctx ) );
}
int mbedtls_asn1_get_alg( unsigned char **p,