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lib: crypto: enable x509_check_for_self_signed()

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When the file, x509_public_key.c, was imported from linux code in
    commit b4adf627d5 ("lib: crypto: add x509 parser"),
x509_check_for_self_signed() was commented out for simplicity.

Now it need be enabled in order to make pkcs7_verify_one(), which will be
imported in a later patch, functional.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro 2020-07-21 19:35:18 +09:00 committed by Heinrich Schuchardt
parent b2a1049b5c
commit 6244b3c7d9
2 changed files with 25 additions and 10 deletions
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2
lib/crypto/x509_cert_parser.c
View file

@ -142,12 +142,10 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
}
cert->id = kid;
#ifndef __UBOOT__
/* Detect self-signed certificates */
ret = x509_check_for_self_signed(cert);
if (ret < 0)
goto error_decode;
#endif
kfree(ctx);
return cert;

33
lib/crypto/x509_public_key.c
View file

@ -8,6 +8,7 @@
#define pr_fmt(fmt) "X.509: "fmt
#ifdef __UBOOT__
#include <common.h>
#include <image.h>
#include <dm/devres.h>
#include <linux/compat.h>
#include <linux/err.h>
@ -18,6 +19,7 @@
#include <linux/kernel.h>
#ifdef __UBOOT__
#include <crypto/x509_parser.h>
#include <u-boot/rsa-checksum.h>
#else
#include <linux/slab.h>
#include <keys/asymmetric-subtype.h>
@ -35,7 +37,9 @@
int x509_get_sig_params(struct x509_certificate *cert)
{
struct public_key_signature *sig = cert->sig;
#ifndef __UBOOT__
#ifdef __UBOOT__
struct image_region region;
#else
struct crypto_shash *tfm;
struct shash_desc *desc;
size_t desc_size;
@ -63,12 +67,25 @@ int x509_get_sig_params(struct x509_certificate *cert)
sig->s_size = cert->raw_sig_size;
#ifdef __UBOOT__
/*
* Note:
* This part (filling sig->digest) should be implemented if
* x509_check_for_self_signed() is enabled x509_cert_parse().
* Currently, this check won't affect UEFI secure boot.
*/
if (!sig->hash_algo)
return -ENOPKG;
if (!strcmp(sig->hash_algo, "sha256"))
sig->digest_size = SHA256_SUM_LEN;
else if (!strcmp(sig->hash_algo, "sha1"))
sig->digest_size = SHA1_SUM_LEN;
else
return -ENOPKG;
sig->digest = calloc(1, sig->digest_size);
if (!sig->digest)
return -ENOMEM;
region.data = cert->tbs;
region.size = cert->tbs_size;
hash_calculate(sig->hash_algo, &region, 1, sig->digest);
/* TODO: is_hash_blacklisted()? */
ret = 0;
#else
/* Allocate the hashing algorithm we're going to need and find out how
@ -118,7 +135,6 @@ error:
return ret;
}
#ifndef __UBOOT__
/*
* Check for self-signedness in an X.509 cert and if found, check the signature
* immediately if we can.
@ -175,6 +191,7 @@ not_self_signed:
return 0;
}
#ifndef __UBOOT__
/*
* Attempt to parse a data blob for a key as an X509 certificate.
*/