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ima-evm-utils: Allow using Streebog hash function

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This patch will allow using GOST algorithms from OpenSSL's
gost-engine[1] via config extension (which is the usual way).

[1] https://github.com/gost-engine/engine

Full usage example:

1. Install the gost-engine package for your distro, this could be
libengine-gost-openssl1.1, openssl-gost-engine, or openssl-engines.

2. Edit openssl.cnf appropriately. Reference INSTALL.md of gost-engine
for the detailed instructions.

3. Then GOST algorithms should work:

  $ cp /dev/null a
  $ openssl dgst -streebog256 a
  md_gost12_256(a)= 3f539a213e97c802cc229d474c6aa32a825a360b2a933a949fd925208d9ce1bb
  $ evmctl -v ima_hash -a streebog256 --xattr-user a
  hash: 04123f539a213e97c802cc229d474c6aa32a825a360b2a933a949fd925208d9ce1bb
  $ getfattr -d -m. -ehex a
  # file: a
  user.ima=0x04123f539a213e97c802cc229d474c6aa32a825a360b2a933a949fd925208d9ce1bb

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Vitaly Chikunov
2018-12-03 06:35:22 +03:00
committed by Mimi Zohar
parent b853b7ba93
commit 7e2a7840a7
3 changed files with 27 additions and 7 deletions
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15
src/libimaevm.c
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@ -51,6 +51,7 @@
#include <stdio.h>
#include <assert.h>
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
@ -67,6 +68,8 @@ const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
[PKEY_HASH_SHA384] = "sha384",
[PKEY_HASH_SHA512] = "sha512",
[PKEY_HASH_SHA224] = "sha224",
[PKEY_HASH_STREEBOG_256] = "streebog256",
[PKEY_HASH_STREEBOG_512] = "streebog512",
};
/*
@ -291,7 +294,7 @@ int ima_calc_hash(const char *file, uint8_t *hash)
md = EVP_get_digestbyname(params.hash_algo);
if (!md) {
log_err("EVP_get_digestbyname() failed\n");
log_err("EVP_get_digestbyname(%s) failed\n", params.hash_algo);
return 1;
}
@ -509,14 +512,16 @@ int verify_hash_v2(const char *file, const unsigned char *hash, int size,
asn1 = &RSA_ASN1_templates[hdr->hash_algo];
if (len < asn1->size || memcmp(out, asn1->data, asn1->size)) {
log_err("%s: verification failed: %d\n", file, err);
log_err("%s: verification failed: %d (asn1 mismatch)\n",
file, err);
return -1;
}
len -= asn1->size;
if (len != size || memcmp(out + asn1->size, hash, len)) {
log_err("%s: verification failed: %d\n", file, err);
log_err("%s: verification failed: %d (digest mismatch)\n",
file, err);
return -1;
}
@ -528,7 +533,8 @@ int get_hash_algo(const char *algo)
int i;
for (i = 0; i < PKEY_HASH__LAST; i++)
if (!strcmp(algo, pkey_hash_algo[i]))
if (pkey_hash_algo[i] &&
!strcmp(algo, pkey_hash_algo[i]))
return i;
return PKEY_HASH_SHA1;
@ -899,5 +905,6 @@ int sign_hash(const char *hashalgo, const unsigned char *hash, int size, const c
static void libinit()
{
OpenSSL_add_all_algorithms();
OPENSSL_add_all_algorithms_conf();
ERR_load_crypto_strings();
}