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shared/tpm2-util: Fix "Error: Esys invalid ESAPI handle (40000001)" warning

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systemd-cryptenroll complains (but succeeds!) upon binding to a signed PCR
policy:

$ systemd-cryptenroll --unlock-key-file=/tmp/passphrase --tpm2-device=auto
  --tpm2-public-key=... --tpm2-signature=..." /tmp/tmp.img

ERROR:esys:src/tss2-esys/esys_iutil.c:394:iesys_handle_to_tpm_handle() Error: Esys invalid ESAPI handle (40000001).
WARNING:esys:src/tss2-esys/esys_iutil.c:415:iesys_is_platform_handle() Convert handle from TPM2_RH to ESYS_TR, got: 0x40000001
ERROR:esys:src/tss2-esys/esys_iutil.c:394:iesys_handle_to_tpm_handle() Error: Esys invalid ESAPI handle (40000001).
WARNING:esys:src/tss2-esys/esys_iutil.c:415:iesys_is_platform_handle() Convert handle from TPM2_RH to ESYS_TR, got: 0x4000000
New TPM2 token enrolled as key slot 1.

The problem seems to be that Esys_LoadExternal() function from tpm2-tss
expects a 'ESYS_TR_RH*' constant specifying the requested hierarchy and not
a 'TPM2_RH_*' one (see Esys_LoadExternal() -> Esys_LoadExternal_Async() ->
iesys_handle_to_tpm_handle() call chain).

It all works because Esys_LoadExternal_Async() falls back to using the
supplied values when iesys_handle_to_tpm_handle() fails:

    r = iesys_handle_to_tpm_handle(hierarchy, &tpm_hierarchy);
    if (r != TSS2_RC_SUCCESS) {
        ...
        tpm_hierarchy = hierarchy;
    }

Note, TPM2_RH_OWNER was used on purpose to support older tpm2-tss versions
(pre https://github.com/tpm2-software/tpm2-tss/pull/1531), use meson magic
to preserve compatibility.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-11-15 14:57:23 +01:00 committed by Lennart Poettering
parent c204cfb2e8
commit 155c51293d
2 changed files with 9 additions and 0 deletions
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3
meson.build
View file

@ -1494,11 +1494,14 @@ if want_tpm2 != 'false' and not skip_deps
tpm2 = dependency('tss2-esys tss2-rc tss2-mu',
required : want_tpm2 == 'true')
have = tpm2.found()
have_esys3 = tpm2.version().version_compare('>= 3.0.0')
else
have = false
have_esys3 = false
tpm2 = []
endif
conf.set10('HAVE_TPM2', have)
conf.set10('HAVE_TSS2_ESYS3', have_esys3)
want_elfutils = get_option('elfutils')
if want_elfutils != 'false' and not skip_deps

6
src/shared/tpm2-util.c
View file

@ -1117,7 +1117,13 @@ static int tpm2_make_policy_session(
ESYS_TR_NONE,
NULL,
&pubkey_tpm2,
#if HAVE_TSS2_ESYS3
/* tpm2-tss >= 3.0.0 requires a ESYS_TR_RH_* constant specifying the requested
* hierarchy, older versions need TPM2_RH_* instead. */
ESYS_TR_RH_OWNER,
#else
TPM2_RH_OWNER,
#endif
&pubkey_handle);
if (rc != TSS2_RC_SUCCESS) {
r = log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),