Check ABI for notifications #2810

erikzhang · 2022-09-02T02:15:14Z

superboyiii · 2022-09-02T02:39:10Z

A little worried that this will break old contract and make data incompatible.

roman-khimov · 2022-09-02T06:19:31Z

We need to check mainnet of course, if something breaks this should be a hardfork, but it's a valuable improvement in general.

Now if we could trust NEP-11/NEP-17 manifest specifications (#1883)...

vncoelho · 2022-09-02T09:52:07Z

That can break and may need a hardfork as you mentioned.

However, in a long-term perspective this is a good compliance to be followed by contracts as @roman-khimov emphasized.

vncoelho

The PR is precise @erikzhang ,as always, code looks simple, we will test asap.

superboyiii · 2022-09-08T10:18:19Z

I can't approve this, we need fork height, otherwise will be break at block 693180 in mainnet. @erikzhang @shargon

roman-khimov · 2022-09-08T11:41:18Z

otherwise will be break at block 693180 in mainnet

Do you have the hash of the contract causing the problem? We may want to search through the whole chain for these inconsistencies and notify contract developers because they need to upgrade their (broken) contracts before the hardfork height.

superboyiii · 2022-09-09T04:16:38Z

Do you have the hash of the contract causing the problem? We may want to search through the whole chain for these inconsistencies and notify contract developers because they need to upgrade their (broken) contracts before the hardfork height.

0x08e7a002104fc8f3130e8ac74f550e8a3022e55f should be from HumswapBowls

roman-khimov · 2022-09-21T20:59:39Z

My current list (up to 2215218 height) is:

INFO    BAD EVENT       {"contract": "08e7a002104fc8f3130e8ac74f550e8a3022e55f", "event": "Transfer", "error": "parameter 3 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "23dcef205da5ed0f48241c8f148bd76dafbc014d", "event": "Transfer", "error": "parameter 3 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "42ff28c97a4e77308c2083a7ae4fc1e7fd837364", "event": "OnPausedChanged", "error": "parameter 0 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "4768c475e4c8465f2edf97f265c85950dfebc787", "event": "ApplySwapToPool", "error": "parameter 2 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "4768c475e4c8465f2edf97f265c85950dfebc787", "event": "ComputeSwap", "error": "parameter 2 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "4768c475e4c8465f2edf97f265c85950dfebc787", "event": "OnNEP17Payment", "error": "parameter 3 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "4768c475e4c8465f2edf97f265c85950dfebc787", "event": "Swap", "error": "parameter 3 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "4768c475e4c8465f2edf97f265c85950dfebc787", "event": "SwapFailure", "error": "parameter 3 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "577a51f7d39162c9de1db12a6b319c848e4c54e5", "event": "Debug", "error": "event Debug does not exist"}
INFO    BAD EVENT       {"contract": "65a27d7a6dcdf960bf2992f88b7b70f1057471e3", "event": "Authorized", "error": "parameter 2 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "6e644dda08a62f3fc9d14e824d1a3bd816a0c2d5", "event": "Fault", "error": "mismatch between the number of parameters and items"}
INFO    BAD EVENT       {"contract": "82be94eb34072de6e38b1ec212302c490a998c08", "event": "Authorized", "error": "parameter 2 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "9fa5ffe173dcd8c55dd51ed9720e0d1c9553442c", "event": "Authorized", "error": "parameter 2 type mismatch: Boolean vs Integer"}
INFO    BAD EVENT       {"contract": "cc638d55d99fc81295daccbaf722b84f179fb9c4", "event": "OrderCancelled", "error": "parameter 0 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "cc638d55d99fc81295daccbaf722b84f179fb9c4", "event": "OrderCreated", "error": "parameter 1 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "cc638d55d99fc81295daccbaf722b84f179fb9c4", "event": "OrderFilled", "error": "parameter 1 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "de3fe8d30d98e049272db4b7bd641943b1e86872", "event": "Transfer", "error": "parameter 3 type mismatch: ByteArray vs Integer"}
INFO    BAD EVENT       {"contract": "edf179715646c9f07bd10b52c1eec44407297b8c", "event": "OnPausedChanged", "error": "parameter 0 type mismatch: Boolean vs Integer"}

And it's not a small one (please recheck though). As much as I like this change we can't just enable it at some height and hope it works, there will be some breakage and I don't think it's acceptable for mainnet. Suggestions are:

for 3.5.0 make this a logged warning instead of a hard failure
contact developers of all involved contracts and notify them that this warning will lead to failure in 3.6.0 (with some rough date estimate)
allow for some event "normalization", we have a lot of Boolean vs Integer for example, but booleans are routinely created by programs with PUSH0 and PUSH1 that create integers and it's not a contract developer's fault, so just like we substitute Buffer with ByteString (for a different reason, but still) we can take an Integer and cast it to Boolean in the Notify itself
a bit more controversial, but this can also be done to Integer emitted in place of ByteString
monitor the chain, check contract updates
release 3.6.0 with a hardfork that will change warning to failure

ixje · 2022-09-23T07:28:57Z

My current list (up to 2215218 height) is:

Very useful. I created an issue internally to address the Bool - Integer conversion and then for the contracts created with boa it should be a matter of recompiling with the latest version.

roman-khimov · 2022-09-23T08:11:46Z

Normalizing in compiler is an option too, even a better one, it's just that it requires contract updates and I'm not sure it can be done in timely manner for mainnet.

ixje · 2022-09-23T08:24:35Z

Normalizing in compiler is an option too, even a better one, it's just that it requires contract updates and I'm not sure it can be done in timely manner for mainnet.

I totally agree with that. I was mostly posting with the idea of indicating we're working on having a migration plan ready for the affected contracts created with boa, so the contract authors should have to spend as little time as possible on it.

roman-khimov · 2022-10-03T12:29:49Z

src/Neo/SmartContract/ApplicationEngine.Runtime.cs

+                case ContractParameterType.Integer:
+                    return aType == StackItemType.Integer;
+                case ContractParameterType.ByteArray:
+                case ContractParameterType.String:


Don't we want to have some additional checks for the String type? The way it is now it's absolutely the same as ByteArray, maybe some differentiation can be useful like if String could only contain valid UTF-8 byte sequence.

@shargon, how about this additional check?

@AnnaShaleva Done

superboyiii · 2022-10-17T08:06:19Z

@erikzhang Let's move on. It's in 3.5.0 release checklist.

superboyiii · 2022-10-19T07:03:47Z

for 3.5.0 make this a logged warning instead of a hard failure

Any example on how to log warning? I'm a little worried if we log it in cli or rpc, still can't be noticed by most people.

roman-khimov · 2022-10-19T08:03:27Z

Well, it's a usual log message (like the one from dBFT or RPC for example), but I know neo-cli does it in a bit different manner than neo-go. We have it in 0.99.4 release already and it's just another log message. Yes, people may not notice it, but they at least will have some chance and it also is tightly related to proper scheduling/announcement of this change. If developers will be aware of the change they will try to take a look at how their contracts behave, if they care about them. If they don't, well, then the contract is obsolete already in some ways.

superboyiii · 2022-10-26T07:51:35Z

Well, it's a usual log message (like the one from dBFT or RPC for example), but I know neo-cli does it in a bit different manner than neo-go. We have it in 0.99.4 release already and it's just another log message. Yes, people may not notice it, but they at least will have some chance and it also is tightly related to proper scheduling/announcement of this change. If developers will be aware of the change they will try to take a look at how their contracts behave, if they care about them. If they don't, well, then the contract is obsolete already in some ways.

Maybe we can send mail to these contract deployers since their emails are in manifest.

superboyiii · 2022-10-27T09:02:21Z

I've sent a mail to these admins to ask them pay attention for this change, I think we could move on.

mfbz · 2022-10-27T21:44:19Z

Hi all,
I saw from the list that our OnPausedChanged method is triggering a "Boolean vs Integer" error.
What are we doing wrong?

This is our event:
public static event Action<bool> OnPausedChanged;

This is how it's described in the manifest:
{"name":"OnPausedChanged","parameters":[{"name":"obj","type":"Boolean"}]}

This is how we are using it:

/// <summary>
/// Update contract paused state without access control.
/// </summary>
/// <remarks>
/// Internal function without access restriction.
/// </remarks>
/// <param name="paused">The new paused value to be set.</param>
protected static void UpdatePaused(bool paused)
{
	PausedStore.Put(paused);
	OnPausedChanged(paused);
}

superboyiii · 2022-10-28T05:38:37Z

Hi all, I saw from the list that our OnPausedChanged method is triggering a "Boolean vs Integer" error. What are we doing wrong?

This is our event: public static event Action<bool> OnPausedChanged;

This is how it's described in the manifest: {"name":"OnPausedChanged","parameters":[{"name":"obj","type":"Boolean"}]}

This is how we are using it:
/// <summary>
/// Update contract paused state without access control.
/// </summary>
/// <remarks>
/// Internal function without access restriction.
/// </remarks>
/// <param name="paused">The new paused value to be set.</param>
protected static void UpdatePaused(bool paused)
{
	PausedStore.Put(paused);
	OnPausedChanged(paused);
}

Nothing wrong, currently Neo push integer instead of bool in VM which will cause break in ABI check. It will be fixed in neo-project/neo-vm#497

mfbz · 2022-10-28T07:14:18Z

Ok, so we don't have to change anything?

superboyiii · 2022-10-28T11:28:04Z

Ok, so we don't have to change anything?

Yes!

Follow the neo-project/neo#2884. A part of the neo-project/neo#2810. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

AnnaShaleva · 2023-08-16T11:05:03Z

src/Neo/SmartContract/ApplicationEngine.Runtime.cs

                case ContractParameterType.ByteArray:
                case ContractParameterType.String:
-                    return aType is StackItemType.Any or StackItemType.ByteString or StackItemType.Buffer &&
-                        Utility.StrictUTF8.GetString(item.GetSpan()) is not null; // Prevent any non-UTF8 string
+                    {
+                        if (aType is StackItemType.Any or StackItemType.ByteString or StackItemType.Buffer)
+                        {


Now this check is being performed for both cases when type is either ContractParameterType.ByteArray or ContractParameterType.String. But the initial idea was to perform this check only for ContractParameterType.String and let the ContractParameterType.ByteArray be as is.

AnnaShaleva · 2023-08-16T13:29:00Z

src/Neo/SmartContract/ApplicationEngine.Runtime.cs

+                case ContractParameterType.String:
+                    {
+                        if (aType is StackItemType.Any or StackItemType.ByteString or StackItemType.Buffer)
+                        {
+                            try
+                            {
+                                _ = Utility.StrictUTF8.GetString(item.GetSpan()); // Prevent any non-UTF8 string
+                                return true;
+                            }
+                            catch { }
+                        }
+                        return false;
+                    }


And the last question from my side: if we have Null stackitem passed as notification parameter and in manifest it is declared ContractParameterType.String, what should happen? The previous version allowed this, but seems that the current code will throw the InvalidCastException exception on item.GetSpan() call for Null stackitem. But I think it's valid to pass Null stackitem as ContractParameterType.String.

@shargon, @roman-khimov, what do you think?

@AnnaShaleva, you're programming in Go, string can't be null there!

Jokes aside, I don't think I have any strong preference here. I'm slightly more in favor of making strings always have some contents (even if it's "", basically the way it is now), but if there are useful cases where Null is applicable, we can accept it too. We can also try having more strict policy for now and then relax it if needed (it's always easier than the other way around).

Let's then adjust a bit the current check so that it'll be more explicit:

if (aType is StackItemType.ByteString or StackItemType.Buffer)

StackItemType.Any normal indicates NULL. But normally depends on where it is.
you can always check for StackItem.IsNull or StackItem.Null
Maybe treat strings the same as string.IsNullOrEmpty() does.

I think that should be empty, not null

@shargon, good, then see the #2810 (comment), please.

superboyiii · 2023-08-17T08:06:57Z

I've compared all block data, at least it's compatible before HFBasilisk on both mainnet and testnet. Will make some tests about expected behaviour after HFBasilisk.

src/Neo/SmartContract/ApplicationEngine.Runtime.cs

Co-authored-by: Anna Shaleva <anna@nspcc.ru>

Follow the neo-project/neo#2884. A part of the neo-project/neo#2810. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

Follow the neo-project/neo#2810 (comment). Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

Follow the neo-project/neo#2884. A part of the neo-project/neo#2810. Fix failing tests along the way (a lot of them have invalid notifications format which differs from the one declared in manifest). Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

Follow the neo-project/neo#2810 (comment). Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

cschuchardt88 · 2023-09-07T09:41:12Z

// is
Runtime.Notify("Hello", new[] { "World" });
// the as
[DisplayName("Hello")]
public static event Action<string> event_name;
event_name("world");

Just wondering if the above calls the same function in the VM. I don't make smart contracts so i don't know.

Check ABI for notifications

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erikzhang mentioned this pull request Sep 2, 2022

fix nep11 tracker neo-project/neo-modules#755

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Neo v3.5.0 Checklist #2811

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Merge branch 'master' into check-abi-for-notifications

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roman-khimov mentioned this pull request Sep 20, 2022

ABI checks for notifications nspcc-dev/neo-go#2703

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roman-khimov mentioned this pull request Sep 23, 2022

Notification normalization in the compler nspcc-dev/neo-go#2713

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Merge branch 'master' into check-abi-for-notifications

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Add PUSHT and PUSHF neo-project/neo-vm#497

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core: move contract notifications check under HFBasilisk

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Follow the neo-project/neo#2884. A part of the neo-project/neo#2810. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

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Merge branch 'master' into check-abi-for-notifications

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Check UTF8 string

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Cleaner way

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Fix Buffer

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Update src/Neo/SmartContract/ApplicationEngine.Runtime.cs

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shargon merged commit 773b96a into master Aug 18, 2023
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AnnaShaleva added a commit to nspcc-dev/neo-go that referenced this pull request Aug 18, 2023

core: move contract notifications check under HFBasilisk

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Follow the neo-project/neo#2884. A part of the neo-project/neo#2810. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

AnnaShaleva added a commit to nspcc-dev/neo-go that referenced this pull request Aug 18, 2023

smartcontract: disallow Null and non-utf8 String

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Follow the neo-project/neo#2810 (comment). Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

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smartcontract: disallow Null and non-utf8 String

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Follow the neo-project/neo#2810 (comment). Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

roman-khimov mentioned this pull request Sep 7, 2023

reconsider PR #2841 #2900

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vang1ong7ang mentioned this pull request Sep 16, 2023

checklist of 3.6.0 PRs that will cause FORK #2910

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roman-khimov mentioned this pull request Sep 21, 2023

Contract call arguments are not type-checked against contract's manifest #1891

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cschuchardt88 mentioned this pull request Dec 25, 2023

Fix: ban notify from contract developer neo-project/neo-devpack-dotnet#845

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[Neo Core Fix] Check params at Calling Contract #3438

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Check ABI for notifications #2810

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Check ABI for notifications #2810

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