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tpm: Pass migration key passphrase via fd to swtpm

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This patch now passes the passphrase as a migration key to swtpm.
This now encrypts the state of the TPM while a VM is migrated between
hosts or when suspended into a file. Since the migration key secret
is the same as the state encryption secret, this now requires that
the migration destination host has the same secret value.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Stefan Berger 2019-07-25 14:22:12 -04:00 committed by Daniel P. Berrangé
parent 5eeff28585
commit a9d6f1c054
1 changed files with 10 additions and 0 deletions
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10
src/qemu/qemu_tpm.c
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@ -584,6 +584,7 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
char *pidfile;
VIR_AUTOFREE(char *) swtpm = virTPMGetSwtpm();
VIR_AUTOCLOSE pwdfile_fd = -1;
VIR_AUTOCLOSE migpwdfile_fd = -1;
const unsigned char *secretuuid = NULL;
if (!swtpm)
@ -653,6 +654,9 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
pwdfile_fd = qemuTPMSetupEncryption(tpm->data.emulator.secretuuid, cmd);
if (pwdfile_fd)
migpwdfile_fd = qemuTPMSetupEncryption(tpm->data.emulator.secretuuid,
cmd);
if (pwdfile_fd < 0 || migpwdfile_fd < 0)
goto error;
virCommandAddArg(cmd, "--key");
@ -660,6 +664,12 @@ qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
pwdfile_fd);
virCommandPassFD(cmd, pwdfile_fd, VIR_COMMAND_PASS_FD_CLOSE_PARENT);
pwdfile_fd = -1;
virCommandAddArg(cmd, "--migration-key");
virCommandAddArgFormat(cmd, "pwdfd=%d,mode=aes-256-cbc",
migpwdfile_fd);
virCommandPassFD(cmd, migpwdfile_fd, VIR_COMMAND_PASS_FD_CLOSE_PARENT);
migpwdfile_fd = -1;
}
return cmd;