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Fix setting correct hash header

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'ima_hash -a sha256' and 'sign -a sha256 --imahash' commands did set
incorrect xattr header for hash algos other than sha1.

Fix it.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
This commit is contained in:
Dmitry Kasatkin 2014-06-24 15:52:16 +03:00
parent 9bc24ee556
commit c958062023
1 changed files with 17 additions and 6 deletions
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21
src/evmctl.c
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@ -651,22 +651,33 @@ static int sign_evm(const char *file, const char *key)
static int hash_ima(const char *file)
{
unsigned char hash[65]; /* MAX hash size + 1 */
int len, err;
unsigned char hash[66]; /* MAX hash size + 2 */
int len, err, offset;
int algo = get_hash_algo(params.hash_algo);
if (algo > PKEY_HASH_SHA1) {
hash[0] = IMA_XATTR_DIGEST_NG;
hash[1] = algo;
offset = 2;
} else {
hash[0] = IMA_XATTR_DIGEST;
len = ima_calc_hash(file, hash + 1);
offset = 1;
}
len = ima_calc_hash(file, hash + offset);
if (len <= 1)
return len;
len += offset;
if (params.verbose >= LOG_INFO)
log_info("hash: ");
if (sigdump || params.verbose >= LOG_INFO)
dump(hash, len + 1);
dump(hash, len);
if (xattr) {
err = lsetxattr(file, "security.ima", hash, len + 1, 0);
err = lsetxattr(file, "security.ima", hash, len, 0);
if (err < 0) {
log_err("setxattr failed: %s\n", file);
return err;