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Better context check for EIP712 sign

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It was possible to define empty structs without any fields and right after, trigger the EIP712 sign UI flow for blank domain & message hashes.
Added checks if there is actually anything relevant to sign.
This commit is contained in:
Alexandre Paillier
2022-10-18 11:48:03 +02:00
parent 0b288cd924
commit 109dffc70e
1 changed files with 9 additions and 0 deletions
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9
src_features/signMessageEIP712/commands_712.c
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@@ -13,6 +13,7 @@
#include "schema_hash.h"
#include "filtering.h"
#include "common_712.h"
#include "ethUtils.h" // allzeroes
/**
* Send the response to the previous APDU command
@@ -185,6 +186,14 @@ bool handle_eip712_sign(const uint8_t *const apdu_buf) {
if (eip712_context == NULL) {
apdu_response_code = APDU_RESPONSE_CONDITION_NOT_SATISFIED;
}
// if the final hashes are still zero or if there are some unimplemented fields
else if (allzeroes(tmpCtx.messageSigningContext712.domainHash,
sizeof(tmpCtx.messageSigningContext712.domainHash)) ||
allzeroes(tmpCtx.messageSigningContext712.messageHash,
sizeof(tmpCtx.messageSigningContext712.messageHash)) ||
(path_get_field() != NULL)) {
apdu_response_code = APDU_RESPONSE_CONDITION_NOT_SATISFIED;
} else if ((ui_712_get_filtering_mode() == EIP712_FILTERING_FULL) &&
(ui_712_remaining_filters() != 0)) {
PRINTF("%d EIP712 filters are missing\n", ui_712_remaining_filters());