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[crypto] Add more ASN.1 functions for X.509 certificate parsing

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-03-18 13:24:20 +00:00
parent da76a489d6
commit e20550fddf
3 changed files with 125 additions and 9 deletions
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106
src/crypto/asn1.c
View File

@@ -43,6 +43,14 @@ FILE_LICENCE ( GPL2_OR_LATER );
__einfo_error ( EINFO_EINVAL_ASN1_LEN )
#define EINFO_EINVAL_ASN1_LEN \
__einfo_uniqify ( EINFO_EINVAL, 0x03, "Field overruns cursor" )
#define EINVAL_ASN1_BOOLEAN \
__einfo_error ( EINFO_EINVAL_ASN1_BOOLEAN )
#define EINFO_EINVAL_ASN1_BOOLEAN \
__einfo_uniqify ( EINFO_EINVAL, 0x04, "Invalid boolean" )
#define EINVAL_ASN1_INTEGER \
__einfo_error ( EINFO_EINVAL_ASN1_INTEGER )
#define EINFO_EINVAL_ASN1_INTEGER \
__einfo_uniqify ( EINFO_EINVAL, 0x04, "Invalid integer" )
/**
* Invalidate ASN.1 object cursor
@@ -191,7 +199,7 @@ int asn1_skip_if_exists ( struct asn1_cursor *cursor, unsigned int type ) {
int asn1_skip ( struct asn1_cursor *cursor, unsigned int type ) {
int rc;
if ( ( rc = asn1_skip_if_exists ( cursor, type ) ) < 0 ) {
if ( ( rc = asn1_skip_if_exists ( cursor, type ) ) != 0 ) {
asn1_invalidate_cursor ( cursor );
return rc;
}
@@ -199,6 +207,32 @@ int asn1_skip ( struct asn1_cursor *cursor, unsigned int type ) {
return 0;
}
/**
* Shrink ASN.1 cursor to fit object
*
* @v cursor ASN.1 object cursor
* @v type Expected type, or ASN1_ANY
* @ret rc Return status code
*
* The object cursor will be shrunk to contain only the current ASN.1
* object. If any error occurs, the object cursor will be
* invalidated.
*/
int asn1_shrink ( struct asn1_cursor *cursor, unsigned int type ) {
struct asn1_cursor next;
int rc;
/* Skip to next object */
memcpy ( &next, cursor, sizeof ( next ) );
if ( ( rc = asn1_skip ( &next, type ) ) != 0 )
return rc;
/* Shrink original cursor to contain only its first object */
cursor->len = ( next.data - cursor->data );
return 0;
}
/**
* Enter ASN.1 object of any type
*
@@ -219,6 +253,76 @@ int asn1_skip_any ( struct asn1_cursor *cursor ) {
return asn1_skip ( cursor, ASN1_ANY );
}
/**
* Shrink ASN.1 object of any type
*
* @v cursor ASN.1 object cursor
* @ret rc Return status code
*/
int asn1_shrink_any ( struct asn1_cursor *cursor ) {
return asn1_shrink ( cursor, ASN1_ANY );
}
/**
* Parse value of ASN.1 boolean
*
* @v cursor ASN.1 object cursor
* @ret value Value, or negative error
*/
int asn1_boolean ( const struct asn1_cursor *cursor ) {
struct asn1_cursor contents;
const struct asn1_boolean *boolean;
/* Enter boolean */
memcpy ( &contents, cursor, sizeof ( contents ) );
asn1_enter ( &contents, ASN1_BOOLEAN );
if ( contents.len != sizeof ( *boolean ) )
return -EINVAL_ASN1_BOOLEAN;
/* Extract value */
boolean = contents.data;
return boolean->value;
}
/**
* Parse value of ASN.1 integer
*
* @v cursor ASN.1 object cursor
* @v value Value to fill in
* @ret rc Return status code
*/
int asn1_integer ( const struct asn1_cursor *cursor, int *value ) {
struct asn1_cursor contents;
uint8_t high_byte;
int rc;
/* Enter integer */
memcpy ( &contents, cursor, sizeof ( contents ) );
if ( ( rc = asn1_enter ( &contents, ASN1_INTEGER ) ) != 0 )
return rc;
if ( contents.len < 1 )
return -EINVAL_ASN1_INTEGER;
/* Initialise value according to sign byte */
*value = *( ( int8_t * ) contents.data );
contents.data++;
contents.len--;
/* Process value */
while ( contents.len ) {
high_byte = ( (*value) >> ( 8 * ( sizeof ( *value ) - 1 ) ) );
if ( ( high_byte != 0x00 ) && ( high_byte != 0xff ) ) {
DBGC ( cursor, "ASN1 %p integer overflow\n", cursor );
return -EINVAL_ASN1_INTEGER;
}
*value = ( ( *value << 8 ) | *( ( uint8_t * ) contents.data ) );
contents.data++;
contents.len--;
}
return 0;
}
/**
* Compare two ASN.1 objects
*

2
src/crypto/x509.c
View File

@@ -55,7 +55,7 @@ static int x509_public_key ( const struct asn1_cursor *certificate,
memcpy ( &cursor, certificate, sizeof ( cursor ) );
rc = ( asn1_enter ( &cursor, ASN1_SEQUENCE ), /* Certificate */
asn1_enter ( &cursor, ASN1_SEQUENCE ), /* tbsCertificate */
asn1_skip_if_exists ( &cursor, ASN1_EXPLICIT_TAG ), /* version */
asn1_skip_if_exists ( &cursor, ASN1_EXPLICIT_TAG(0) ),/*version*/
asn1_skip ( &cursor, ASN1_INTEGER ), /* serialNumber */
asn1_skip ( &cursor, ASN1_SEQUENCE ), /* signature */
asn1_skip ( &cursor, ASN1_SEQUENCE ), /* issuer */