Migrate own identity local trust to rust crypto #4090

BillCarsonFr · 2024-03-04T08:37:31Z

When you log in with a new session, that session will do a /keys/query to see if the user has existing published cross-signing keys. The new login has now to decide if these published keys can be trusted.

This is done by performing verification:

Using 4S if available: the user enters the 4S passphrase/key, then can retrieve the private parts of the cross-signing keys to see if they match the public parts.
By using another already trusted session. At the end of this process the js-sdk will mark the cross-signing keys as trusted. This is done by storing the public keys using storeTrustedSelfKeys. Later on the the new session will request the private keys from the existing session via secret gossiping.

There are several cases where you can end up with a trusted session that doesn't have the private MSK, for example it can happen if the session you verified against don't have it, or if secret gossiping failed for some reason.

The problem is that rust crypto will only consider the current session as trusted if we import the private MSK itself.
That means that a legacy trusted session that does not have the MSK in cache will revert to untrusted after migration.

This PR adds a way to detect that case, and then mark the migrated session as trusted (mark_as_verified) if the legacy session was trusted. (aka migration of local trust of own identity).

Checklist

Tests written for new code (and old code if feasible)
Linter and other CI checks pass
Sign-off given on the changes (see CONTRIBUTING.md)

src/rust-crypto/libolm_migration.ts

richvdh · 2024-03-06T10:40:33Z

This is done by performing verification:

Using 4S if available, the user enters the 4S passphrase/key, then can retrieve the private parts of the cross-signing keys to see if they match the public parts.

I might be confused, but I don't think that is what we normally mean by "verification"? Or is it?

richvdh · 2024-03-06T10:43:47Z

By using another already trusted session. At the end of this process the js-sdk will mark the cross-signing keys as trusted. This is done by storing the public keys using storeTrustedSelfKeys. Later on the the new session will request the private keys from the existing session via secret gossiping.

Am I right in understanding that this only applies to legacy crypto? When I read the description in the PR I assumed it was a general description of how MSK trust works in both legacy and ER -- is that not correct?

dkasak · 2024-03-06T11:29:49Z

I might be confused, but I don't think that is what we normally mean by "verification"? Or is it?

It's a bit ambiguous. I think we generally lack a great term for the concept that encompasses both

obtaining the user identity from an authenticated storage where we've previously stashed it ourselves
obtaining it from an existing device which we have verified in the spec sense of Device Verification

Semantically, this is authentication of the user identity. We're also referring to this as "trusting" or "establishing trust" in various places, but some people found that confusing for whatever reason.

This is an area which would benefit from some spec work, in order to introduce and define sensible terms and consolidate all public resources to use them consistently.

src/rust-crypto/index.ts

src/rust-crypto/libolm_migration.ts

spec/test-utils/test_indexeddb_cryptostore_dump/unverified/README.md

spec/test-utils/test_indexeddb_cryptostore_dump/no_cached_msk_dump/index.ts

spec/integ/crypto/rust-crypto.spec.ts

src/rust-crypto/libolm_migration.ts

richvdh · 2024-03-08T14:25:03Z

src/rust-crypto/libolm_migration.ts

+    /** The logger to use */
+    logger: Logger;
+}): Promise<void> {
+    const { legacyCryptoStore, rustCrypto, logger } = args;
    // Now get the cross-signing identity from rust.
    // If this is null that means that there are no cross-signing keys published server side.


this line is redundant to the comment on line 416 now: that's why I asked you to split out the if statements, and why my suggestion removed this comment.

Suggested change

// If this is null that means that there are no cross-signing keys published server side.

richvdh · 2024-03-08T14:41:19Z

src/rust-crypto/index.ts

@@ -197,6 +201,14 @@ async function initOlmMachine(
                // It will be retried by the sdk.


It's a bit more annoying for migrating local trust, as if it fails we wont migrate local trust. But worst case you'll have to verify manually after?

Right, this is my point. We decided that having to re-verify was unacceptable, didn't we? Especially given we don't actually tell the user they have to re-verify.

Tbh, I feel like it would be a lesser evil to block the application here - ie, sit in a loop repeatedly retrying userHasCrossSigningKeys until it works. [We know that the server is reachable, because we've already done a /room_keys/version request?] Or we could try once, and if that doesn't work, fire off a background thread to keep retrying in a loop?

spec/test-utils/test_indexeddb_cryptostore_dump/full_account/index.ts

spec/test-utils/test_indexeddb_cryptostore_dump/README.md

spec/test-utils/test_indexeddb_cryptostore_dump/full_account/README.md

spec/integ/crypto/rust-crypto.spec.ts

richvdh

Still a few comments I'm afraid. Some of this is getting a bit nit-picky so feel free to push back if you think it's excessive. The only thing that I think really matters is the part about updating the trust if the initial /keys/query request fails.

Also please look above: there are a few unresolved threads.

…eeded

Co-authored-by: Richard van der Hoff <[email protected]>

…s://github.com/matrix-org/matrix-js-sdk into valere/element-r/migrate_local_trust_if_needed

Co-authored-by: Richard van der Hoff <[email protected]>

richvdh

LGTM other than a couple of nits

richvdh · 2024-03-15T16:35:48Z

src/rust-crypto/libolm_migration.ts

+    /** The logger to use */
+    logger: Logger;
+}): Promise<void> {
+    const { legacyCryptoStore, rustCrypto, logger } = args;
    // Now get the cross-signing identity from rust.
    // If this is null that means that there are no cross-signing keys published server side.


Suggested change

// If this is null that means that there are no cross-signing keys published server side.

spec/test-utils/test_indexeddb_cryptostore_dump/index.ts

richvdh · 2024-03-15T16:45:47Z

spec/test-utils/test_indexeddb_cryptostore_dump/index.ts

+    /** Additional dump info specific for some tests.*/
+    [key: string]: any;


I don't think this is necessary: a class can have additional fields which aren't specified in an interface.

Suggested change

/** Additional dump info specific for some tests.*/

[key: string]: any;

I am getting that error Object literal may only specify known properties if it's not there

Migrate own identity trust to rust crypto

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BillCarsonFr changed the title ~~Migrate own identity trust to rust crypto~~ Migrate own identity local trust to rust crypto Mar 4, 2024

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Fix gendoc not happy if msk of IDownloadKeyResult has a signature

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ElementR| Retry query backup until it works during migration to avoid spurious correption error popup #4113

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Migrate own identity local trust to rust crypto #4090

Migrate own identity local trust to rust crypto #4090

BillCarsonFr commented Mar 4, 2024 •

edited by richvdh

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BillCarsonFr Mar 18, 2024

		@@ -197,6 +201,14 @@ async function initOlmMachine(
		// It will be retried by the sdk.

		/** Additional dump info specific for some tests.*/
		[key: string]: any;

Migrate own identity local trust to rust crypto #4090

Migrate own identity local trust to rust crypto #4090

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BillCarsonFr commented Mar 4, 2024 • edited by richvdh Loading

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BillCarsonFr commented Mar 4, 2024 •

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