heads/initrd/bin/unseal-totp

#!/bin/bash
# Retrieve the sealed file from the NVRAM, unseal it and compute the totp

. /etc/functions

TOTP_SECRET="/tmp/secret/totp.key"

TRACE "Under /bin/unseal-totp"

if [ "$CONFIG_TPM" = "y" ]; then
	tpmr unseal 4d47 0,1,2,3,4,7 312 "$TOTP_SECRET" \
		|| die "Unable to unseal totp secret"
fi

if ! totp -q < "$TOTP_SECRET"; then
	shred -n 10 -z -u "$TOTP_SECRET" 2> /dev/null
	die 'Unable to compute TOTP hash?'
fi

shred -n 10 -z -u "$TOTP_SECRET" 2> /dev/null
exit 0
Add dual support for real bash and busybox's bash(ash) - modify bash to have it configured with -Os 2023-02-08 21:01:48 +00:00			`#!/bin/bash`
import the seal/unseal totp scripts since they are very specialized to the heads install, skip owner password if not required (issue #151) 2017-04-12 10:49:39 +00:00			`# Retrieve the sealed file from the NVRAM, unseal it and compute the totp`

			`. /etc/functions`

			`TOTP_SECRET="/tmp/secret/totp.key"`

Add TRACE function tracing function to output on console when enabled - Add TRACE function tracing output under etc/functions, depending on CONFIG_ENABLE_FUNCTION_TRACING_OUTPUT enabled in board configs - Replace current DEBUG to TRACE calls in code, reserving DEBUG calls for more verbose debugging later on (output of variables etc) - add 'export CONFIG_ENABLE_FUNCTION_TRACING_OUTPUT=y' in qemu-coreboot(fb)whiptail-tpm1(-hotp) boards to see it in action 2023-02-20 16:01:17 +00:00			`TRACE "Under /bin/unseal-totp"`
All scripts and functions: Add DEBUG calling trace on console when CONFIG_DEBUG_OUTPUT is exported in board config -qemu-coreboot-*whiptail-tpm1(-hotp) boards have 'export CONFIG_DEBUG_OUTPUT=y' by default now 2023-02-18 17:58:43 +00:00
tpmr: Wrap TPM1 and TPM2 unseal actions so scripts can invoke either Provide tpmr unseal to unseal a file with TPM1 or TPM2. For TPM1, it wraps tpm nv_readvalue and tpm unsealfile. For TPM2, it wraps tpm2 unseal. kexec-unseal-key, seal-hotpkey, unseal-hotp, and unseal-totp no longer need to differentiate TPM1/TPM2. Fixes spurious shred errors on TPM2 that only apply to TPM1 (temporary sealed secret file and shred are now internal to tpmr). Fixes TPM1 disk unlock key unsealing due to logic errors relating to exit status of tpmr unseal or tpm unsealfile (now always uses status of tpmr unseal). Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm> 2023-02-28 18:36:11 +00:00			`if [ "$CONFIG_TPM" = "y" ]; then`
seal-totp, kexec-seal-key: Use common logic for TPM1 and TPM2 Provide tpmr commands pcrread, pcrsize, calcfuturepcr, and seal for both TPM1 and TPM2. Combine seal logic for TPM1/TPM2 in seal-totp, kexec-seal-key. This is essentially the TPM2 logic now that tpmr provides the same wrapped commands for both TPM1 and TPM2. Remove algorithm prefix from PCR list in tpmr unseal for consistency with tpmr seal. Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm> 2023-03-08 17:39:06 +00:00			`tpmr unseal 4d47 0,1,2,3,4,7 312 "$TOTP_SECRET" \`
Addition of qemu-(fb)whiptail-tpm2(-hotp) boards -coreboot support of TPM v2.0 (shared config for TPM2 support across all 4 previous variations) -swtpm set to be launched under TPM v2.0 mode under board config -Documentation file under each board.md softlinks to qemu-coreboot-fbwhiptail-tpm1.md (which has been generalized) This is skeleton for TPM v2 integration under Heads ------------- WiP TODO: - libcurl cannot be built as a tpm2-tools dependency as of now not sure why. curl currently needs to be added in board config to be built - Note: tpm-reset (master and here) needs some review, no handle of no tpm use case. Caller is responsible to not call it otherwise does nothing - init tries to bind fd and fails currently - Note: Check if whiptail is different of fbwhiptail in clearing screen. As of now every clear seems to be removed, still whiptail clears previous console output - When no OS' /boot can be mounted, do not try to TPM reset (will fail) - seal-hotpkey is not working properly - setting disk unlock key asks for TPM ownership passphrase (sealing in NV requires ownership, but text is misleading user as if reowning TPM) - We should cache input, feed tpm behind the scene and wipe passphrase and state clearly that this is TPM disk unlock kye passphrase. - primary key from TPM2 is invalid most of the time from kexec-select-boot and verifying global hashes but is setuped correctly at disk unlock key setup - would be nice to take advantage of bash function tracing to understand where we are for debugging purposes, code takes ash in consideration only - tpmr says it implements nv calls but actually doesn't. Removing those falsely wrapped functions would help. - Implementing them would be better - REVIEW TODOS IN CODE - READD CIRCLECI CONFIG Current state: - TPM unseal works without disk unlock key and generates TOTP properly (was missing die condition at unseal to not produce always good TOTP even if invalid) - TPM disk encryption key fails. Hypothesis is that sealing with USB drivers loaded and measures in inconsistent with sealed with/without. - TPM disk unsealing happens without USB modules being loaded in non-HOTP setup. This fails. - Current tests are with fbwhiptail (no clear called so having traces on command line of what happens) - Testing with HOTP implementation for sealing/unsealing since that forces USB module loads on each boot to remove this from failing possibilities 2022-08-25 18:43:31 +00:00			`\|\| die "Unable to unseal totp secret"`
			`fi`
import the seal/unseal totp scripts since they are very specialized to the heads install, skip owner password if not required (issue #151) 2017-04-12 10:49:39 +00:00
print and update the timestamp on the TOTP while waiting for disk unlock code 2017-04-12 12:28:31 +00:00			`if ! totp -q < "$TOTP_SECRET"; then`
supress errors on console when files don't exist (equivalent of rm -f) 2019-02-22 01:16:02 +00:00			`shred -n 10 -z -u "$TOTP_SECRET" 2> /dev/null`
import the seal/unseal totp scripts since they are very specialized to the heads install, skip owner password if not required (issue #151) 2017-04-12 10:49:39 +00:00			`die 'Unable to compute TOTP hash?'`
			`fi`

supress errors on console when files don't exist (equivalent of rm -f) 2019-02-22 01:16:02 +00:00			`shred -n 10 -z -u "$TOTP_SECRET" 2> /dev/null`
import the seal/unseal totp scripts since they are very specialized to the heads install, skip owner password if not required (issue #151) 2017-04-12 10:49:39 +00:00			`exit 0`