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vfs/cbe_trust_anchor: use hash of passphrase

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Instead of using the user passphrase directly, use its SHA256 hash calculated
using libcrypto. The passphrase hash is still stored in the key file to be
used as base for the very primitive way of generating the private key.

Ref #4032
This commit is contained in:
Martin Stein 2021-04-09 11:38:50 +02:00 committed by Norman Feske
parent 989b7f39e1
commit 75a55b62a3
2 changed files with 20 additions and 20 deletions
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6
repos/gems/lib/mk/spec/x86_64/vfs_cbe_trust_anchor.mk
View File

@ -1,5 +1,11 @@
OPENSSL_DIR = $(call select_from_ports,openssl)
SRC_CC = vfs.cc
INC_DIR += $(OPENSSL_DIR)/include
LIBS += libcrypto
vpath % $(REP_DIR)/src/lib/vfs/cbe_trust_anchor
SHARED_LIB := yes

34
repos/gems/src/lib/vfs/cbe_trust_anchor/vfs.cc
View File

@ -18,6 +18,9 @@
#include <util/arg_string.h>
#include <util/xml_generator.h>
/* OpenSSL includes */
#include <openssl/sha.h>
/* CBE includes */
#include <cbe/vfs/io_job.h>
@ -216,10 +219,10 @@ class Trust_anchor
break;
}
if (_key_io_job_buffer.size == _passphrase_buffer.size &&
if (_key_io_job_buffer.size == _passphrase_hash_buffer.size &&
Genode::memcmp(_key_io_job_buffer.base,
_passphrase_buffer.base,
_passphrase_buffer.size) == 0) {
_passphrase_hash_buffer.base,
_passphrase_hash_buffer.size) == 0) {
Genode::memset(_private_key.value, 0xa5,
sizeof (_private_key.value));
@ -482,7 +485,7 @@ class Trust_anchor
struct Key_io_job_buffer : Util::Io_job::Buffer
{
char buffer[64] { };
char buffer[SHA256_DIGEST_LENGTH] { };
Key_io_job_buffer()
{
@ -492,7 +495,7 @@ class Trust_anchor
};
Key_io_job_buffer _key_io_job_buffer { };
Key_io_job_buffer _passphrase_buffer { };
Key_io_job_buffer _passphrase_hash_buffer { };
bool _check_key_file(Path const &path)
{
@ -848,15 +851,10 @@ class Trust_anchor
if (_state != State::UNINITIALIZED) {
return false;
}
SHA256((unsigned char const *)src, len,
(unsigned char *)_key_io_job_buffer.base);
if (len > _key_io_job_buffer.size) {
len = _key_io_job_buffer.size;
}
_key_io_job_buffer.size = len;
Genode::memcpy(_key_io_job_buffer.buffer, src,
_key_io_job_buffer.size);
_key_io_job_buffer.size = SHA256_DIGEST_LENGTH;
_job = Job::INIT;
_job_state = Job_state::PENDING;
@ -893,14 +891,10 @@ class Trust_anchor
return true;
}
if (len > sizeof(_passphrase_buffer.buffer)) {
len = sizeof(_passphrase_buffer.buffer);
}
SHA256((unsigned char const *)src, len,
(unsigned char *)_passphrase_hash_buffer.base);
_passphrase_buffer.size = len;
Genode::memcpy(_passphrase_buffer.buffer, src,
_passphrase_buffer.size);
_passphrase_hash_buffer.size = SHA256_DIGEST_LENGTH;
_job = Job::UNLOCK;
_job_state = Job_state::PENDING;