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set default hash algorithm in configuration time

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The default hash algorithm for evmctl is today hardcoded in the libimaevm.c
file. To facilitate package maintainers across different distributions to
set their own default hash algorithm, this patch adds the
--with-default-hash=<algo> option to the configuration script.

The chosen algorithm will then be checked by its available in the kernel,
otherwise IMA won't be able to verify files hashed by the user. For that,
the kernel header hash_info.h used as the source of supported hashes. In
case the hash_info.h header is not present, the configuration script warns
about it, but uses whatever the user specified in the option.

Signed-off-by: Bruno Meneguele <bmeneg@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Bruno Meneguele
2021-09-10 15:47:00 -03:00
committed by Mimi Zohar
parent 5356b0487a
commit 80bb310152
6 changed files with 46 additions and 4 deletions
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4
src/evmctl.c
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@@ -2500,7 +2500,7 @@ static void usage(void)
printf(
"\n"
" -a, --hashalgo sha1 (default), sha224, sha256, sha384, sha512, streebog256, streebog512\n"
" -a, --hashalgo sha1, sha224, sha256, sha384, sha512, streebog256, streebog512 (default: %s)\n"
" -s, --imasig make IMA signature\n"
" -d, --imahash make IMA hash\n"
" -f, --sigfile store IMA signature in .sig file instead of xattr\n"
@@ -2538,7 +2538,7 @@ static void usage(void)
"\n"
"Environment variables:\n\n"
"EVMCTL_KEY_PASSWORD : Private key password to use; do not use --pass option\n"
"\n");
"\n", DEFAULT_HASH_ALGO);
}
struct command cmds[] = {