On 7/25/19 2:22 PM, Stefan Berger wrote:
> Allow vTPM state encryption when swtpm_setup and swtpm support
> passing a passphrase using a file descriptor.
>
> This patch enables the encryption of the vTPM state only. It does
> not encrypt the state during migration, so the destination secret
> does not need to have the same password at this point.
>
> Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> Reviewed-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
> ---
> src/libvirt_private.syms | 2 +
> src/qemu/qemu_tpm.c | 110 ++++++++++++++++++++++++++++++++++++++-
> src/util/virtpm.c | 16 ++++++
> src/util/virtpm.h | 3 ++
> 4 files changed, 129 insertions(+), 2 deletions(-)
>
[...]
> /*
> * qemuTPMEmulatorRunSetup
> @@ -387,6 +448,7 @@ qemuTPMEmulatorPrepareHost(virDomainTPMDefPtr tpm,
> * @logfile: The file to write the log into; it must be writable
> * for the user given by userid or 'tss'
> * @tpmversion: The version of the TPM, either a TPM 1.2 or TPM 2
> + * @encryption: pointer to virStorageEncryption holding secret
> *
> * Setup the external swtpm by creating endorsement key and
> * certificates for it.
> @@ -399,7 +461,8 @@ qemuTPMEmulatorRunSetup(const char *storagepath,
> uid_t swtpm_user,
> gid_t swtpm_group,
> const char *logfile,
> - const virDomainTPMVersion tpmversion)
> + const virDomainTPMVersion tpmversion,
> + const unsigned char *secretuuid)
> {
> virCommandPtr cmd = NULL;
> int exitstatus;
> @@ -407,6 +470,7 @@ qemuTPMEmulatorRunSetup(const char *storagepath,
> char uuid[VIR_UUID_STRING_BUFLEN];
> char *vmid = NULL;
> VIR_AUTOFREE(char *)swtpm_setup = virTPMGetSwtpmSetup();
> + VIR_AUTOCLOSE pwdfile_fd = -1;
>
> if (!swtpm_setup)
> return -1;
> @@ -439,6 +503,23 @@ qemuTPMEmulatorRunSetup(const char *storagepath,
> break;
> }
>
> + if (secretuuid) {
> + if (!virTPMSwtpmSetupCapsGet(
> + VIR_TPM_SWTPM_SETUP_FEATURE_CMDARG_PWDFILE_FD)) {
> + virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED,
> + _("%s does not support passing a passphrase using a file "
> + "descriptor"), virTPMGetSwtpmSetup());
Coverity complains since virTPMGetSwtpm() returns something that needs
to be free'd. I note above that @swtpm_setup is already set - is that
what was meant here?
> + goto cleanup;
> + }
> + if ((pwdfile_fd = qemuTPMSetupEncryption(secretuuid, cmd)) < 0)
> + goto cleanup;
> +
> + virCommandAddArg(cmd, "--pwdfile-fd");
> + virCommandAddArgFormat(cmd, "%d", pwdfile_fd);
> + virCommandAddArgList(cmd, "--cipher", "aes-256-cbc", NULL);
> + virCommandPassFD(cmd, pwdfile_fd, VIR_COMMAND_PASS_FD_CLOSE_PARENT);
> + pwdfile_fd = -1;
> + }
>
> virCommandAddArgList(cmd,
> "--tpm-state", storagepath,
> @@ -502,6 +583,8 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
> bool created = false;
> char *pidfile;
> VIR_AUTOFREE(char *) swtpm = virTPMGetSwtpm();
> + VIR_AUTOCLOSE pwdfile_fd = -1;
> + const unsigned char *secretuuid = NULL;
>
> if (!swtpm)
> return NULL;
> @@ -510,10 +593,14 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
> &created, swtpm_user, swtpm_group) < 0)
> return NULL;
>
> + if (tpm->data.emulator.hassecretuuid)
> + secretuuid = tpm->data.emulator.secretuuid;
> +
> if (created &&
> qemuTPMEmulatorRunSetup(tpm->data.emulator.storagepath, vmname, vmuuid,
> privileged, swtpm_user, swtpm_group,
> - tpm->data.emulator.logfile, tpm->version) < 0)
> + tpm->data.emulator.logfile, tpm->version,
> + secretuuid) < 0)
> goto error;
>
> unlink(tpm->data.emulator.source.data.nix.path);
> @@ -556,6 +643,25 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
> virCommandAddArgFormat(cmd, "file=%s", pidfile);
> VIR_FREE(pidfile);
>
> + if (tpm->data.emulator.hassecretuuid) {
> + if (!virTPMSwtpmCapsGet(VIR_TPM_SWTPM_FEATURE_CMDARG_PWD_FD)) {
> + virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED,
> + _("%s does not support passing passphrase via file descriptor"),
> + virTPMGetSwtpm());
Same, but @swtpm is used in this context
John
> + goto error;
> + }
> +
> + pwdfile_fd = qemuTPMSetupEncryption(tpm->data.emulator.secretuuid, cmd);
> + if (pwdfile_fd)
> + goto error;
> +
> + virCommandAddArg(cmd, "--key");
> + virCommandAddArgFormat(cmd, "pwdfd=%d,mode=aes-256-cbc",
> + pwdfile_fd);
> + virCommandPassFD(cmd, pwdfile_fd, VIR_COMMAND_PASS_FD_CLOSE_PARENT);
> + pwdfile_fd = -1;
> + }
> +
> return cmd;
>
> error:
--
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