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Snapshot of mostly but not entirely working code to include the extra
ModExpA7 key components in the keystore. Need to investigate whether
a more compact representation is practical for these components, as
the current one bloats the key object so much that a bare 4096-bit key
won't fit in a single hash block, and there may not be enough room for
PKCS #11 attributes even for smaller keys.
If more compact representation not possible or insufficient, the other
option is to double the size of a keystore object, making it two flash
subsectors for a total of 8192 octets. Which would of course halve
the number of keys we can store and require a bunch of little tweaks
all through the ks code (particularly flash erase), so definitely
worth trying for a more compact representation first.
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The internal keystore API has changed enough since where the "logout"
branch forked that a plain merge would have no prayer of compiling,
must less running. So this merge goes well beyond manual conflict
resolution: it salvages the useful code from the "logout" branch, with
additional code as needed to reimplement the functionality. Sorry.
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Cosmetic cleanup of pkey_slot along the way.
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Need to refactor init sequence slightly (again), this time to humor
the bootloader, which has its own special read-only view of the PIN
block in the token keystore.
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What I get for writing code while build and test environment is tied
up with a multi-day run testing something else.
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I doubt this change will have any noticable effect, but it's another
theoretical race condition, might as well eliminate it.
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pkey_open() now looks in both keystores rather than requiring the user
to know. The chance of collision with randomly-generated UUID is low
enough that we really ought to be able to present a single namespace.
So now we do.
pkey_match() now takes a couple of extra arguments which allow a
single search to cover both keystores, as well as matching for
specific key flags. The former interface was pretty much useless for
anything involving flags, and required the user to issue a separate
call for each keystore.
User wheel is now exempt from the per-session key lookup constraints,
Whether this is a good idea or not is an interesting question, but the
whole PKCS #11 derived per-session key thing is weird to begin with,
and having keystore listings on the console deliberately ignore
session keys was just too confusing.
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Enforce minimum PKCS #1.5 padding length when decrypting KEK.
Use public interface to hal_pkey_load() rather than calling the
internal function directly, so we go through all the normal error
checks.
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Now that we use PKCS #8 format for private keys, all key formats we
use include ASN.1 AlgorithmIdentifier field describing the key, so
specifying key type and curve as arguments to hal_rpc_pkey_load() is
neither necessary nor particularly useful.
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Borrowing an idea from PyCrypto, we substitute CSPRNG output for the
value of a decrypted KEK if the PKCS #1.5 type 02 block format check
fails. Done properly, this should be very close to constant-time, and
should make it harder to use hal_rpc_pkey_import() as an oracle.
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Among other things, it turns out that this works better if one
remembers to write the RPC server dispatch code as well as the client
code, doh.
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Still missing Python script to drive backup process, and need to do
something about setting the EXPORTABLE key flag for this to be useful.
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PKCS #11 supports zero-length attributes (eg, CKA_LABEL) so hack of
using zero length attribute as NIL value won't work, instead we use a
slightly more portable version of the hack PKCS #11 uses (PKCS #11
stuffs -1 into a CK_ULONG, we stuff 0xFFFFFFFF into a uint32_t).
ks_attribute.c code was trying too hard and tripping over its own
socks. Instead of trying to maintain attributes[] in place during
modification, we now perform the minimum necessary change then re-scan
the block. This is (very slightly) slower but more robust, both
because the scan code has better error checking and because it's the
scan code that we want to be sure is happy before committing a change.
Rename hal_rpc_pkey_attribute_t to hal_pkey_attribute_t.
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The current pkey access control rules are a bit complex, because they
need to support the somewhat complex rules required by PKCS #11. This
is fine, as far as it goes, but a strict interpretation leaves
HAL_USER_NORMAL as the only user able to see many keys. This is
confusing when using the CLI, to put it mildly.
HAL_USER_WHEEL is intended for exactly this sort of thing: it's a user
ID which, by definition, can never appear in an RPC call from PKCS
to see the same keys that HAL_USER_NORMAL would.
HAL_USER_SO remains restricted per the PKCS #11 rules.
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hal_rpc_pkey_list() was a simplistic solution that worked when the
keystore only supported a handful of keys and we needed a quick
temporary solution in time for a workshop. It doesn't handle large
numbers of keys well, and while we could fix that, all of its
functionality is now available via more robust API functions, so
simplifying the API by deleting it seems best.
Since this change required mucking with dispatch vectors yet again, it
converts them to use C99 "designated initializer" syntax.
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pkey attribute API is now just set_attributes() and get_attributes().
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This is not yet complete, only the ks_volatile driver supports it,
ks_flash will be a bit more complicated and isn't written yet.
At the moment, this adds a complete duplicate set of
{set,get,delete}_attributes() functions in parallel to the earlier
{set,get,delete}_attribute() functions. We will almost certainly want
to get rid of the duplicates, probably (but not necessarily) the
entire single-attribute suite. At the moment, though, we want both
sets so we can compare execution speeds of the two sets of functions.
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Incidental minor refactoring of hal_rpc_server_dispatch().
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Pure-remote-mode (where even the hashing is done in the HSM) did not
work, because XDR passes zero length strings rather than NULL string
pointers. Mostly, we use fixed mode, so nobody noticed.
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This is more complicated than I'd have liked, because the PKCS #11
semantics are (much) more complicated than just "are you logged in?"
New code passes basic testing with libhal.py and the PKCS #11 unit
tests, but there are still unexplored corner cases to be checked.
Private token objects remain simple. Code which does not need PKCS
HAL_KEY_FLAG_TOKEN and avoid HAL_KEY_FLAG_PUBLIC.
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In retrospect it's obvious that this never needed to be an
input/output argument, as its value will always be the same as the
last value in the returned array. Doh. So simplify the RPC and call
sequence slightly by removing the unnecessary output value.
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Mostly this is another checkpoint (still passes PKCS #11 "make test").
ks_volatile.c now contains support for per-session object visibility;
this may need more work to support things like a CLI view of all
objects regardless of session. Adding this required minor changes to
the keystore and pkey APIs, mostly because sessions are per-client.
ks_volatile.c also contains an untested first cut at attribute
support. Attribute support in ks_flash.c still under construction.
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RPC calls which pass a pkey handle don't need to pass a session
handle, because the session handle is already in the HSM's pkey slot
object; pkey RPC calls which don't pass a pkey argument do need to
pass a session handle.
This change percolates down to the keystore driver, because only the
keystore driver knows whether that particular keystore cares about
session handles.
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This is mostly to archive a commit where PKCS #11 "make test" still
works after converting the ks_volatile code to use SDRAM allocated at
startup instead of (large) static variables.
The attribute code itself is incomplete at this point.
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Now that key names are UUIDs generated by the HSM, there's no real
need to specify type key type when looking up a key, and removing the
`type` argument allows a few simplifications of both the internal
keystore API and of client code calling the public RPC API.
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New keystore code requires slightly different cleanup to avoid leaking
pkey handle table slots. Pricetag for reducing the amount of data
duplicated between pkey and keystore layers.
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Fixes for various minor issues found while integrating with sw/stm32.
Moving the in-memory keystore (PKCS #11 session objects, etc) from the
client library to the HSM was on the near term to-do list in any case,
doing it now turned out to be the easiest way to solve one of the
build problems.
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Changes to implement a revised keystore API. This code probably won't
even compile properly yet, and almost certainly will not run, but most
of the expected changes are complete at this point. Main points:
* Key names are now UUIDs, and are generated by the HSM, not the client.
* Keystore API no longer assumes that key database is resident in
memory (original API was written on the assumption that the keystore
flash would be mapped into the HSM CPU's address space, but
apparently the board and flash drivers don't really support that).
A few other changes have probably crept in, but the bulk of this
changeset is just following through implications of the above, some of
which percolate all the way back to the public RPC API.
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PKCS #11 expects a DigestInfo rather than a raw digest when passing a
pre-computed digest for PKCS #1.5 signature or verification, so the
rpc_pkey signature and verification calls do too. This requires
special case handling of RSA when the user passes a digest handle in
mixed mode. Annoying, but PKCS #1.5 is weird enoug that there's no
way to avoid some kind of special case handling, this approach has the
advantage of not requiring us to parse and reconstruct the ASN.1, and
is probably what PKCS #11 has trained software to expect in any case.
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hsmbully tests strange RSA key sizes (eg, 3416 bits) which don't fall
on word boundaries, at which point we have buffer padding and
alignment issues when performing RSA signature verification.
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Temporary nature of null string as key name is not enforced by the
keystore code, it's just a convention to allow callers to generate a
keypair, obtain the public key, hash that to a Subject Key Identifier
(SKI), and rename the key using the SKI as the new name.
This is a compromise to let us use SKI-based key names in PKCS #11
while keeping the keystore code simple.
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