efi_siglist.h File Reference

PEM-encoded ASN.1 data. More...

#include <stdint.h>
#include <ipxe/asn1.h>
#include <ipxe/image.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
int	efisig_asn1 (const void *data, size_t len, size_t offset, struct asn1_cursor **cursor)
	Extract ASN.1 object from EFI signature list. More...
struct image_type efisig_image_type	__image_type (PROBE_NORMAL)

Detailed Description

PEM-encoded ASN.1 data.

Definition in file efi_siglist.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

efisig_asn1()

int efisig_asn1	(	const void *	data,
		size_t	len,
		size_t	offset,
		struct asn1_cursor **	cursor
	)

Extract ASN.1 object from EFI signature list.

Parameters

data	EFI signature list
len	Length of EFI signature list
offset	Offset within image
cursor	ASN.1 cursor to fill in

Return values

next	Offset to next image, or negative error

The caller is responsible for eventually calling free() on the allocated ASN.1 cursor.

Definition at line 143 of file efi_siglist.c.

                                                {
        const EFI_SIGNATURE_LIST *lhdr;
        const EFI_SIGNATURE_DATA *dhdr;
        int ( * asn1 ) ( const void *data, size_t len, size_t offset,
                         struct asn1_cursor **cursor );
        size_t skip = offsetof ( typeof ( *dhdr ), SignatureData );
        int next;
        int rc;

        /* Locate signature list entry */
        if ( ( rc = efisig_find ( data, len, &offset, &lhdr, &dhdr ) ) != 0 )
                goto err_entry;
        len = ( offset + lhdr->SignatureSize );

        /* Parse as PEM or DER based on first character */
        asn1 = ( ( dhdr->SignatureData[0] == ASN1_SEQUENCE ) ?
                 der_asn1 : pem_asn1 );
        DBGC2 ( data, "EFISIG [%#zx,%#zx) extracting %s\n", offset, len,
                ( ( asn1 == der_asn1 ) ? "DER" : "PEM" ) );
        next = asn1 ( data, len, ( offset + skip ), cursor );
        if ( next < 0 ) {
                rc = next;
                DBGC ( data, "EFISIG [%#zx,%#zx) could not extract ASN.1: "
                       "%s\n", offset, len, strerror ( rc ) );
                goto err_asn1;
        }

        /* Check that whole entry was consumed */
        if ( ( ( unsigned int ) next ) != len ) {
                DBGC ( data, "EFISIG [%#zx,%#zx) malformed data\n",
                       offset, len );
                rc = -EINVAL;
                goto err_whole;
        }

        return len;

 err_whole:
        free ( *cursor );
 err_asn1:
 err_entry:
        return rc;
}

References image_type::asn1, ASN1_SEQUENCE, data, DBGC, DBGC2, der_asn1(), efisig_find(), EINVAL, free, len, next, offset, offsetof, pem_asn1(), rc, EFI_SIGNATURE_DATA::SignatureData, EFI_SIGNATURE_LIST::SignatureSize, strerror(), and typeof().

Referenced by efi_cacert(), and efisig_image_asn1().

__image_type()

struct image_type efisig_image_type __image_type

(

PROBE_NORMAL

)