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gamecard: add proper validation of root HFS partition headers in Terra gamecards

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This commit is contained in:
Pablo Curiel 2024-05-20 23:06:36 +02:00
parent 7d5b904835
commit 503ce4c1a7
1 changed files with 15 additions and 4 deletions
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19
source/core/gamecard.c
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@ -1350,10 +1350,13 @@ static HashFileSystemContext *gamecardInitializeHashFileSystemContext(const char
hfs_ctx->header_size = ALIGN_UP(hfs_ctx->header_size, GAMECARD_PAGE_SIZE);
/* Allocate memory for the full Hash FS header. */
hfs_ctx->header = calloc(hfs_ctx->header_size, sizeof(u8));
/* If we're dealing with the root partition, we'll reserve an extra byte to accomodate for the compatibility type value. */
/* This value is used as a salt when calculating the SHA-256 checksum. */
u64 hfs_header_alloc_size = (name ? hfs_ctx->header_size : (hfs_ctx->header_size + 1));
hfs_ctx->header = calloc(hfs_header_alloc_size, sizeof(u8));
if (!hfs_ctx->header)
{
LOG_MSG_ERROR("Unable to allocate 0x%lX bytes buffer for the full Hash FS header! (\"%s\", offset 0x%lX).", hfs_ctx->header_size, hfs_ctx->name, offset);
LOG_MSG_ERROR("Unable to allocate 0x%lX bytes buffer for the full Hash FS header! (\"%s\", offset 0x%lX).", hfs_header_alloc_size, hfs_ctx->name, offset);
goto end;
}
@ -1365,16 +1368,24 @@ static HashFileSystemContext *gamecardInitializeHashFileSystemContext(const char
}
/* Verify Hash FS header (if possible). */
/* TODO: enable hash verification on Terra gamecards if we ever find out how to properly calculate matching checksums. */
if (hash && hash_target_size && (hash_target_offset + hash_target_size) <= hfs_ctx->header_size && g_gameCardInfoArea.compatibility_type == GameCardCompatibilityType_Normal)
if (hash && hash_target_size && (hash_target_offset + hash_target_size) <= hfs_ctx->header_size)
{
/* Add salt to header and update hash target size if we're dealing with the root partition + a compatibility type other than Normal. */
u8 compatibility_type = g_gameCardInfoArea.compatibility_type;
bool use_salt = (!name && compatibility_type != GameCardCompatibilityType_Normal);
if (use_salt) hfs_ctx->header[hash_target_size++] = compatibility_type;
sha256CalculateHash(hfs_header_hash, hfs_ctx->header + hash_target_offset, hash_target_size);
if (memcmp(hfs_header_hash, hash, SHA256_HASH_SIZE) != 0)
{
LOG_MSG_ERROR("Hash FS header doesn't match expected SHA-256 hash! (\"%s\", offset 0x%lX).", hfs_ctx->name, offset);
dump_fs_header = true;
goto end;
}
/* Remove salt from header. */
if (use_salt) hfs_ctx->header[--hash_target_size] = '\0';
}
/* Fill context. */