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libkmod: remove pkcs7 obj_to_hash_algo()

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Switch to using OBJ_obj2txt() to calculate and print the pkcs7
signature hash name. This eliminates the need to duplicate libcrypto
NID to name mapping, detect SM3 openssl compile-time support, and
enables using any hashes that openssl and kernel know about. For
example SHA3 are being added for v6.7 and with this patch are
automatically supported.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Link: https://lore.kernel.org/r/20231029010319.157390-1-dimitri.ledkov@canonical.com
This commit is contained in:
Dimitri John Ledkov 2023-10-29 03:03:19 +02:00 committed by Lucas De Marchi
parent 3af2f475b0
commit 510c8b7f74
2 changed files with 20 additions and 46 deletions
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7
configure.ac
View File

@ -133,13 +133,6 @@ AC_ARG_WITH([openssl],
AS_IF([test "x$with_openssl" != "xno"], [
PKG_CHECK_MODULES([libcrypto], [libcrypto >= 1.1.0], [LIBS="$LIBS $libcrypto_LIBS"])
AC_DEFINE([ENABLE_OPENSSL], [1], [Enable openssl for modinfo.])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <openssl/ssl.h>
int nid = NID_sm3;]])], [
AC_MSG_NOTICE([openssl supports sm3])
], [
AC_MSG_NOTICE([openssl sm3 support not detected])
CPPFLAGS="$CPPFLAGS -DOPENSSL_NO_SM3"
])
module_signatures="PKCS7 $module_signatures"
], [
AC_MSG_NOTICE([openssl support not requested])

59
libkmod/libkmod-signature.c
View File

@ -127,6 +127,7 @@ struct pkcs7_private {
PKCS7 *pkcs7;
unsigned char *key_id;
BIGNUM *sno;
char *hash_algo;
};
static void pkcs7_free(void *s)
@ -137,42 +138,11 @@ static void pkcs7_free(void *s)
PKCS7_free(pvt->pkcs7);
BN_free(pvt->sno);
free(pvt->key_id);
free(pvt->hash_algo);
free(pvt);
si->private = NULL;
}
static int obj_to_hash_algo(const ASN1_OBJECT *o)
{
int nid;
nid = OBJ_obj2nid(o);
switch (nid) {
case NID_md4:
return PKEY_HASH_MD4;
case NID_md5:
return PKEY_HASH_MD5;
case NID_sha1:
return PKEY_HASH_SHA1;
case NID_ripemd160:
return PKEY_HASH_RIPE_MD_160;
case NID_sha256:
return PKEY_HASH_SHA256;
case NID_sha384:
return PKEY_HASH_SHA384;
case NID_sha512:
return PKEY_HASH_SHA512;
case NID_sha224:
return PKEY_HASH_SHA224;
# ifndef OPENSSL_NO_SM3
case NID_sm3:
return PKEY_HASH_SM3;
# endif
default:
return -1;
}
return -1;
}
static const char *x509_name_to_str(X509_NAME *name)
{
int i;
@ -219,7 +189,8 @@ static bool fill_pkcs7(const char *mem, off_t size,
unsigned char *key_id_str;
struct pkcs7_private *pvt;
const char *issuer_str;
int hash_algo;
char *hash_algo;
int hash_algo_len;
size -= sig_len;
pkcs7_raw = mem + size;
@ -278,27 +249,37 @@ static bool fill_pkcs7(const char *mem, off_t size,
X509_ALGOR_get0(&o, NULL, NULL, dig_alg);
hash_algo = obj_to_hash_algo(o);
if (hash_algo < 0)
// Use OBJ_obj2txt to calculate string length
hash_algo_len = OBJ_obj2txt(NULL, 0, o, 0);
if (hash_algo_len < 0)
goto err3;
sig_info->hash_algo = pkey_hash_algo[hash_algo];
// hash algo has not been recognized
if (sig_info->hash_algo == NULL)
hash_algo = malloc(hash_algo_len + 1);
if (hash_algo == NULL)
goto err3;
hash_algo_len = OBJ_obj2txt(hash_algo, hash_algo_len + 1, o, 0);
if (hash_algo_len < 0)
goto err4;
// Assign libcrypto hash algo string or number
sig_info->hash_algo = hash_algo;
sig_info->id_type = pkey_id_type[modsig->id_type];
pvt = malloc(sizeof(*pvt));
if (pvt == NULL)
goto err3;
goto err4;
pvt->pkcs7 = pkcs7;
pvt->key_id = key_id_str;
pvt->sno = sno_bn;
pvt->hash_algo = hash_algo;
sig_info->private = pvt;
sig_info->free = pkcs7_free;
return true;
err4:
free(hash_algo);
err3:
free(key_id_str);
err2: