3e4ff6ffb3
This code allows us to parse ASN1 node and allocating memory to store it. It will work for anything where the size libtasn1 returns is right: - Integers - Octet strings - DER encoding of other structures It will _not_ work for things where libtasn1 size requires adjustment: - Strings that require an extra NULL byte at the end - Bit strings because libtasn1 returns the length in bits, not bytes. If the function returns a non-NULL value, the caller must free it. Signed-off-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2020, 2022 Free Software Foundation, Inc.
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* Copyright (C) 2020, 2022, 2025 IBM Corporation
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libtasn1.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/mm.h>
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#include <grub/crypto.h>
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#include <grub/misc.h>
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#include <grub/gcrypt/gcrypt.h>
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#include "appendedsig.h"
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asn1_node grub_gnutls_gnutls_asn = NULL;
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asn1_node grub_gnutls_pkix_asn = NULL;
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extern const asn1_static_node grub_gnutls_asn1_tab[];
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extern const asn1_static_node grub_pkix_asn1_tab[];
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/*
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* Read a value from an ASN1 node, allocating memory to store it. It will work
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* for anything where the size libtasn1 returns is right:
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* - Integers
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* - Octet strings
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* - DER encoding of other structures
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*
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* It will _not_ work for things where libtasn1 size requires adjustment:
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* - Strings that require an extra NULL byte at the end
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* - Bit strings because libtasn1 returns the length in bits, not bytes.
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*
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* If the function returns a non-NULL value, the caller must free it.
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*/
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void *
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grub_asn1_allocate_and_read (asn1_node node, const char *name, const char *friendly_name,
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grub_int32_t *content_size)
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{
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grub_int32_t result;
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grub_uint8_t *tmpstr = NULL;
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grub_int32_t tmpstr_size = 0;
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result = asn1_read_value (node, name, NULL, &tmpstr_size);
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if (result != ASN1_MEM_ERROR)
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "reading size of %s did not return expected status: %s",
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friendly_name, asn1_strerror (result)) ;
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return NULL;
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}
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tmpstr = grub_malloc (tmpstr_size);
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if (tmpstr == NULL)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "could not allocate memory to store %s",
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friendly_name) ;
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return NULL;
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}
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result = asn1_read_value (node, name, tmpstr, &tmpstr_size);
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if (result != ASN1_SUCCESS)
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{
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grub_free (tmpstr);
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "error reading %s: %s", friendly_name,
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asn1_strerror (result)) ;
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return NULL;
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}
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*content_size = tmpstr_size;
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return tmpstr;
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}
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int
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grub_asn1_init (void)
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{
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int res;
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res = asn1_array2tree (grub_gnutls_asn1_tab, &grub_gnutls_gnutls_asn, NULL);
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if (res != ASN1_SUCCESS)
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return res;
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res = asn1_array2tree (grub_pkix_asn1_tab, &grub_gnutls_pkix_asn, NULL);
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return res;
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}
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