Commit Graph

516 Commits

Author SHA1 Message Date
Jonathon Hall
4b58788063
init: Execute /bin/sh for interactive shell, not /bin/bash
bash will not be the default interactive shell since readline support
increases the binary size significantly.  Use /bin/sh (busybox ash) for
that.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:53 -05:00
Jonathon Hall
c98ae5b53d
recovery, passwd: Use /bin/sh for interactive shells
Use /bin/sh (ash in busybox builds) for interactive shells, not bash.
Preparation for trimming interactive features from bash to reduce size.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:51 -05:00
Jonathon Hall
7ab5e5c3e3
tpmr: Clean up TODOs about size parameter to tpm2_unseal
The size parameter is actually the size of the sealed secret to TPM1,
not the unsealed data size.  TPM2 does not observe the sealed secret,
so just ignore that parameter.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:51 -05:00
Jonathon Hall
0a38717e20
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>
2023-03-08 12:45:50 -05:00
Jonathon Hall
55e5a41eca
tpmr: Add kexec_finalize command to finalize TPM before boot
TPM2 locks the platform heirarchy, flushes transient objects, and
flushes sessions.  (This now cleans up sessions created during
startsession that previously were not cleaned up, although the OS might
flush all sessions as well.)

TPM1 currently does not do anything, but the command is accepted so
kexec-boot does not need to differentiate TPM1/2.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:49 -05:00
Jonathon Hall
f324b72be6
tpmr: Seal/unseal using sha256 of password
TPM2 is only required to support password lengths up to its longest
hash size (32 chars for sha256).  Pass the sha256 of the password
instead of the actual password so the password can be arbitrarily long.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:49 -05:00
Jonathon Hall
6efabeb520
tpmr: Set flags properly on sealed file
Set flags 'fixedtpm|fixedparent|adminwithpolicy'.  Plain password auth
is no longer allowed.  For objects sealed with a password, the password
is part of the auth policy, so both PCRs and password must be satisfied
to unseal.

Tested by manually attempting to unseal disk unlock key with password:
    tpm2 unseal -c 0x81000003 -p "<password>"

This now correctly returns an error indicating this auth method is not
allowed.

Relative to the documented default flags for tpm2_create:

* sign, decrypt: Not applicable to a sealed object, tpm2_create
  automatically removed these from the defaults.
* fixedtpm, fixedparent: Kept
* sensitivedataorigin: Not applicable an object where the sensitive
  data is not generated by the TPM.
* userwithauth: Removed this, "user" actions must satisfy auth policy.
* adminwithpolicy: Added this, "admin" actions must satisfy auth
  policy.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:49 -05:00
Jonathon Hall
bc736450cb
kexec-select-boot: For debug inspection, drop to recovery
After saving a disk unlock key, if debug output is enabled, drop to
a recovery shell to allow inspection of debug output.

The script isn't intended to return from this point after sealing a
key - returning attempts to boot, which can't unseal the key.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:48 -05:00
Jonathon Hall
8bf5415e79
tpmr: Add seal/unseal debug tracing
Trace parameters to seal/unseal and some key tpm2 invocations.  Trace
invocation of tpmr seal/unseal for disk unlock key.

Add DO_WITH_DEBUG() to trace a command and parameters, then execute it.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:48 -05:00
Jonathon Hall
e6acaad215
tpmr: Fix sealing/unsealing file with both PCRs and passwords
When sealing/unsealing with a password, use a policy including both the
specified PCRs and the object password.  Fixes sealing and unsealing
disk unlock key.

tpm2 seems to have a bug in parameter decryption when using a policy
session and password in this way, disable encryption in the policy
session as a workaround.

Flags still need to be set on the sealed object correctly, as the
password is normally allowed on its own as an alternative to policy
auth.

Add -Q to some tpm2 invocations to silence diagnostics on stdout.

Pass filename for unsealed secret rather than capturing from stdout
for robustness against tpm2 diagnostics on stdout.

Fix unseal result check in kexec-unseal-key.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:48 -05:00
Thierry Laurion
1e5544b934
Add DEBUG traces and have TPM2 boards enable TRACE and DEBUG calls
- /tmp/debug.log is created and appended by all TRACE and DEBUG calls in code
- fix some logic errors seen when no DEBUG entry were outputted in /tmp/debug.log
2023-03-08 12:45:47 -05:00
Jonathon Hall
79e10ee135
kexec-unseal-key, tpmr: Deduplicate TPM1/2 code and always use stdin pass
Always send password via stdin to tpm2 create, tpm2 unseal.  The password
could being with things like 'file:', 'str:', 'pcr:' that would be
interpreted by tpm2.

Deduplicate the TPM1/2 code in kexec-unseal-key.  The TPM2 code was not
actually prompting for the password or sending it to tpmr unseal.

Password is still not working yet though.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:47 -05:00
Jonathon Hall
2c6caa18a7
kexec-(un)seal-key: Delete CONFIG_AUTO_UNLOCK logic
CONFIG_AUTO_UNLOCK does not exist in Heads.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:47 -05:00
Jonathon Hall
b500505312
tpm2-tools: Change sense of CONFIG_TPM to mean any TPM, not just TPM1.
Most logic throughout Heads doesn't need to know TPM1 versus TPM2 (and
shouldn't, the differences should be localized).  Some checks were
incorrect and are fixed by this change.  Most checks are now unchanged
relative to master.

There are not that many places outside of tpmr that need to
differentiate TPM1 and TPM2.  Some of those are duplicate code that
should be consolidated (seal-hotpkey, unseal-totp, unseal-hotp), and
some more are probably good candidates for abstracting in tpmr so the
business logic doesn't have to know TPM1 vs. TPM2.

Previously, CONFIG_TPM could be variously 'y', 'n', or empty.  Now it
is always 'y' or 'n', and 'y' means "any TPM".  Board configs are
unchanged, setting CONFIG_TPM2_TOOLS=y implies CONFIG_TPM=y so this
doesn't have to be duplicated and can't be mistakenly mismatched.

There were a few checks for CONFIG_TPM = n that only coincidentally
worked for TPM2 because CONFIG_TPM was empty (not 'n').  This test is
now OK, but the checks were also cleaned up to '!= "y"' for robustness.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:46 -05:00
Jonathon Hall
d51993b6a9
tpm-reset: Reduce duplication with tpmr reset
Use common password prompt logic in tpm-reset rather than duplicating
in tpmr reset.

Use common logic in config-gui.sh to reset the TPM.

Use common logic in oem-factory-reset to reset TPM.  Fixes extra
prompts for TPM2 owner password even when choosing to use a common
password.  Fix sense of "NO TPM" check in TOTP generation (which only
happened to work because CONFIG_TPM is empty for TPM2).

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:46 -05:00
Jonathon Hall
ab57cd0b9a
tpmr: Fix wording of owner password prompt in tpm2_sealfile()
It's asking for the existing password, not a new password.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:46 -05:00
Jonathon Hall
cf3ee19795
seal-hotpkey: Fix quoting in CONFIG_TPM test
$CONFIG_TPM needs to be quoted, or [ syntax is incorrect when it's
empty.  Fixes errors in console with TPM2 (but behavior was correct due
to [ still returning false as expected).

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:45 -05:00
Jonathon Hall
55a41c3fdb
kexec-save-default: Always update TPM2 primary object handle hash
Resetting the TPM creates a new primary object, and there is no reason
for kexec-save-default to sign an old hash.  Always update the hash
instead of creating it only if it doesn't exist.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:45 -05:00
Jonathon Hall
7ea606524b
gui-init: Remove TPM2 primary handle hash when resetting TPM
Resetting the TPM invalidates the primary handle hash, and
kexec-save-default only generates a hash if none exists.  Remove the
hash file when it is invalidated.

OEM reset and "Reset Configuration" both already remove all kexec
files.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 12:45:44 -05:00
Thierry Laurion
8da5d5d723
Add dual support for real bash and busybox's bash(ash)
- modify bash to have it configured with -Os
2023-03-08 12:45:44 -05:00
Thierry Laurion
6923fb5e20
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
2023-03-08 12:45:43 -05:00
tlaurion
5c7148f18d
Merge pull request from echo-84/yubikey-oem-factory-reset 2023-02-21 12:06:35 -05:00
Thierry Laurion
8259d3ca1e
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 11:44:52 -05:00
Thierry Laurion
5fbbbbc3f7
gui-init: fix sh: argument expected 2023-02-18 21:52:54 -05:00
Thierry Laurion
5bc2bc88e4
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 21:52:44 -05:00
builder
e900d2027a Check Signature PIN and toggle forcesig if not forced 2023-02-01 20:34:07 -06:00
tlaurion
1c68befc59
Merge pull request from tlaurion/new_tails_key
/etc/distro/keys/tails.key: Replace with updated and minimized one
2023-01-27 16:07:55 -05:00
tlaurion
7be67e4992
Merge pull request from tlaurion/usb-scan_moved_to-media-scan
usb-scan->media-scan: usb-init calling media-scan usb
2023-01-27 16:07:17 -05:00
Thierry Laurion
150b95a034
TPM disk unlock key setup: Automatically override selected default boot option's initrd's crypttab file(s) to point to LUKS decryption key in injected cpio
- kexec-save-default extracts initrd crypttab files and creates /boot/kexec_initrd_crypttab_overrides.txt entries pointing to /secret.key
- kexec-insert-key applies /boot/kexec_initrd_crypttab_overrides.txt to replace initrd's crypttabs files pointing to inserted /secret.key through cpio
- Both scripts inform the user of applied magic on screen
2023-01-27 13:27:17 -05:00
HardenedVault
8a60930c6b
Make the path to crypttab within initramfs overridable
Not all distro put crypttab under /etc/ within initramfs, but finding it at
runtime needs unpacking, which may be hard to do, so it is made overridable
with a file at /boot/kexec_initrd_crypttab_path.txt, whose content could be
obtained with $ cpio -t < ${uncompressed_initrd} | grep crypttab .

The "target" field of the record within the crypttab stored in the root
file system for the luks container which is going to be unlocked via
kexec-insert-key should be modified into the same "luks-$uuid" format,
otherwise the boot sequence will get stuck when OS is trying to unlock them
again, in order to map them according to "target" fields written in the
crypttab stored in the root fs.
2023-01-27 12:56:32 -05:00
Thierry Laurion
268767d300
/etc/distro/keys/tails.key: Replace with updated and minimized one 2023-01-26 15:58:57 -05:00
Thierry Laurion
299977926c
usb-scan->media-scan: usb-init calling media-scan usb
media-scan accepts direct input of existing blkid and mount that passed device to /media
2023-01-26 15:38:58 -05:00
tlaurion
c1ae44d71c
Merge pull request from danielp96/master
/etc/functions: fix detection of virtual flash drive in qemu.
2023-01-26 14:33:38 -05:00
Thierry Laurion
e00280e663
gui-init: warn the user when sealing measurements through TOTP/HOTP requires TPM reset 2023-01-19 14:59:45 -05:00
Daniel Pineda
3cd8654566
/etc/functions: fix detection of virtual flash drive in qemu.
Adds check to detect device formatted as fat32 without partition table.

With fat32 fdisk does not print message about invalid partition table
and instead it'll print an empty table with header.
In both cases total output has the same length of 5 lines: 3 about
device info, 1 empty line and the 5th will be the table header or
invalid partition message.

Signed-off-by: Daniel Pineda <daniel.pineda@puri.sm>
2023-01-18 11:27:15 -06:00
tlaurion
e45980d33f
Merge pull request from tlaurion/usb_modules_load_order_fix 2023-01-17 12:13:04 -05:00
Thierry Laurion
256313a988
/etc/functions: fix order when loading usb modules to prevent warning 2023-01-16 15:21:14 -05:00
3hhh
d07df1e60b
initrd: escape_zero: allow some more characters
Since it's not supposed to be shell safe, just display safe
inside double quotes, we can allow some more characters.

Also fix the escape character not being escaped.
2023-01-14 13:14:09 +01:00
3hhh
2ae7f53e04
initrd: assert_signable: use recovery() instead of die()
and display some more information to the user, if
available
2023-01-14 10:27:42 +01:00
3hhh
c65d6b92c0
initrd: call assert_signable earlier
No need to check for the GPG card first.
2023-01-14 10:07:31 +01:00
3hhh
4ce8f664ad
initrd: work around a bug in busybox sha256sum
busybox sha256sum will create a checksum file for uncommon file names
(e.g. /boot/foo"$\n"bar), but fail to verify that exact file.
https://bugs.busybox.net/show_bug.cgi?id=14226

Thus disallow all files in /boot/ with strange file names at the time of
signing for now. Verifying in the presence of new files with such file
names in /boot/ is no issue for the kexec_tree verification due to the
previously implemented escaping mechanism.
2023-01-14 10:02:49 +01:00
3hhh
e368c3f6ea
initrd: speed up non-GUI booting
by not generating the kexec_tree diff in that case
2023-01-14 10:02:49 +01:00
3hhh
f52466edbf
initrd kexec_tree: fix various escaping issues
Attempt to fix the following issues:
1. unescaped file names may let an attacker display arbitrary
   whiptail prompts --> escape, original code by @JonathonHall-Purism
2. whiptail itself allows escape characters such as \n
   --> use an escape character not used by whiptail, i.e. #
3. performance issues caused by diff'ing too early -->
   only generate a diff to display to the user, if an actual issue is
   found
2023-01-14 10:02:49 +01:00
3hhh
60df237c37
initrd: fix error message to work with kexec_tree 2023-01-14 10:02:48 +01:00
3hhh
accd9f470d
initrd: track files in /boot in kexec_tree.txt
Fixes 
2023-01-14 10:02:27 +01:00
Thierry Laurion
90b2e0ca5d
kexec-save-default: do /boot operation in subshell
fixes screwed commit 6f6f37ec3a
2023-01-13 14:54:14 -05:00
tlaurion
1236cbc29e
Merge pull request from tlaurion/adjust_printf_clear 2023-01-13 12:23:53 -05:00
Thierry Laurion
1dd8fb4cf1
gui-init: add a print clear after TOTP Qr code being confirmed to be scanned by user 2023-01-13 11:25:27 -05:00
Thierry Laurion
3d5db5d9e2
functions: remove the last two print clear which prevented to troubleshoot console output 2023-01-13 11:24:26 -05:00
Thierry Laurion
87027d6a88
recovery call: since we operate under set -e, make sure that shred failing doesn't exit 2023-01-12 18:04:27 -05:00