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clarify Solana CPI and account lookup semantics #766

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clarify Solana CPI and account lookup semantics #766

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35 changes: 33 additions & 2 deletions features/policies/examples/solana.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -47,16 +47,20 @@ See [here](../../../concepts/policies/smart-contract-interfaces) for more inform
}
```

#### Allow Solana transactions that only use the Solana System Program
#### Allow Solana transactions whose top-level instructions only use the Solana System Program

```json
{
"policyName": "Enable transactions that only use the system program",
"effect": "EFFECT_ALLOW",
"condition": "solana.tx.program_keys.all(p, p == '11111111111111111111111111111111')"
"condition": "solana.tx.top_level_program_keys.all(p, p == '11111111111111111111111111111111')"
}
```

This condition checks only program IDs serialized as top-level instructions. It does not restrict
programs invoked later through CPI. To bound CPI reachability, use one of the account-reference
allowlist patterns below.

#### Deny all Solana transactions transferring to an undesired address

```json
Expand Down Expand Up @@ -97,6 +101,33 @@ See [here](../../../concepts/policies/smart-contract-interfaces) for more inform
}
```

#### Allow only vetted static accounts and reject address table lookups

This pattern is a conservative CPI reachability allowlist. Include every expected signer, program,
and other account in the list.

```json
{
"policyName": "Allow only vetted static Solana accounts",
"effect": "EFFECT_ALLOW",
"condition": "solana.tx.address_table_lookups.count() == 0 && solana.tx.static_account_keys.all(k, k in ['<ALLOWED_ACCOUNT_1>', '<ALLOWED_ACCOUNT_2>', '<ALLOWED_PROGRAM>'])"
}
```

#### Allow vetted static accounts and exact address table references

Turnkey does not resolve these references to public keys during policy evaluation. Use this pattern
only after independently verifying each existing table/index mapping. Do not pre-approve an index
whose account mapping is unknown.

```json
{
"policyName": "Allow only vetted Solana account references",
"effect": "EFFECT_ALLOW",
"condition": "solana.tx.static_account_keys.all(k, k in ['<ALLOWED_ACCOUNT_1>', '<ALLOWED_PROGRAM>']) && solana.tx.address_table_lookup_references.all(r, r.address_table_key == '<ALLOWED_TABLE>' && ((r.index == <WRITABLE_INDEX> && r.writable) || (r.index == <READONLY_INDEX> && !r.writable)))"
}
```

#### Deny sending to an address from a table lookup

```json
Expand Down
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