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nca: fix bugs in plaintext hash layer reading.

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SHA3-256 support is still missing.
This commit is contained in:
Pablo Curiel 2022-06-25 09:22:09 +02:00
parent 2c4ddac4c6
commit 4b2cd46785
1 changed files with 66 additions and 26 deletions
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92
source/core/nca.c
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@ -902,47 +902,87 @@ static bool _ncaReadFsSection(NcaFsSectionContext *ctx, void *out, u64 read_size
} }
/* Check if we're supposed to read a hash layer without encryption. */ /* Check if we're supposed to read a hash layer without encryption. */
if (ctx->skip_hash_layer_crypto && ((offset + read_size) <= ctx->last_layer_offset || (ctx->last_layer_offset + ctx->last_layer_size) <= offset || \ if (ctx->skip_hash_layer_crypto)
(offset < ctx->last_layer_offset && (offset + read_size) > ctx->last_layer_offset) || \
(ctx->last_layer_offset < offset && (ctx->last_layer_offset + ctx->last_layer_size) < (offset + read_size))))
{ {
/* Easy route. Just read the plaintext data we need and bail out. */
if ((offset + read_size) <= ctx->last_layer_offset || (ctx->last_layer_offset + ctx->last_layer_size) <= offset) if ((offset + read_size) <= ctx->last_layer_offset || (ctx->last_layer_offset + ctx->last_layer_size) <= offset)
{ {
/* Easy route. Just read the plaintext data we need and bail out. */
ret = ncaReadContentFile(nca_ctx, out, read_size, content_offset); ret = ncaReadContentFile(nca_ctx, out, read_size, content_offset);
if (!ret) LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#1).", read_size, content_offset, \ if (!ret) LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#1).", read_size, content_offset, \
nca_ctx->content_id_str, ctx->section_num); nca_ctx->content_id_str, ctx->section_num);
goto end; goto end;
} } else
if ((offset < ctx->last_layer_offset && (offset + read_size) > ctx->last_layer_offset && (offset + read_size) <= (ctx->last_layer_offset + ctx->last_layer_size)) || \
/* Long, tedious route. Calculate offsets and block sizes. */ (ctx->last_layer_offset < offset && (ctx->last_layer_offset + ctx->last_layer_size) > offset && (ctx->last_layer_offset + ctx->last_layer_size) < (offset + read_size)))
block_start_offset = content_offset;
block_end_offset = ((block_start_offset + read_size) - (offset < ctx->last_layer_offset ? ctx->last_layer_offset : (ctx->last_layer_offset + ctx->last_layer_size)));
block_size = (block_end_offset - block_start_offset);
if (offset < ctx->last_layer_offset)
{ {
/* Read plaintext area. */ /* Handle reads that span across both plaintext hash layers and encrypted FS area. */
if (!ncaReadContentFile(nca_ctx, out, block_size, block_start_offset)) bool plaintext_first = (offset < ctx->last_layer_offset);
/* Calculate offsets and block sizes. */
block_start_offset = content_offset;
block_end_offset = (ctx->section_offset + (plaintext_first ? ctx->last_layer_offset : (ctx->last_layer_offset + ctx->last_layer_size)));
block_size = (block_end_offset - block_start_offset);
if (plaintext_first)
{ {
LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#2).", block_size, block_start_offset, \ /* Read plaintext area. Use NCA-relative offset. */
if (!ncaReadContentFile(nca_ctx, out, block_size, block_start_offset))
{
LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#2).", block_size, block_start_offset, \
nca_ctx->content_id_str, ctx->section_num);
goto end;
}
/* Read encrypted area. Use FS-section-relative offset. */
ret = _ncaReadFsSection(ctx, (u8*)out + block_size, read_size - block_size, offset + block_size);
} else {
/* Read encrypted area. Use FS-section-relative offset. */
if (!_ncaReadFsSection(ctx, out, block_size, offset)) goto end;
/* Read plaintext area. Use NCA-relative offset. */
ret = ncaReadContentFile(nca_ctx, (u8*)out + block_size, read_size - block_size, block_end_offset);
if (!ret) LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#3).", read_size - block_size, \
block_end_offset, nca_ctx->content_id_str, ctx->section_num);
}
goto end;
} else
if (offset < ctx->last_layer_offset && (offset + read_size) > (ctx->last_layer_offset + ctx->last_layer_size))
{
/* Handle plaintext hash layer + encrypted FS area + plaintext hash layer reads. */
u8 *out_u8 = (u8*)out;
/* Read plaintext area. Use NCA-relative offset. */
block_start_offset = content_offset;
block_end_offset = (ctx->section_offset + ctx->last_layer_offset);
block_size = (block_end_offset - block_start_offset);
if (!ncaReadContentFile(nca_ctx, out_u8, block_size, block_start_offset))
{
LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#4).", block_size, block_start_offset, \
nca_ctx->content_id_str, ctx->section_num); nca_ctx->content_id_str, ctx->section_num);
goto end; goto end;
} }
/* Read encrypted area. */ /* Read encrypted area. Use FS-section-relative offset. */
ret = _ncaReadFsSection(ctx, (u8*)out + block_size, read_size - block_size, offset + block_size); out_u8 += block_size;
} else { block_start_offset = ctx->last_layer_offset;
/* Read encrypted area. */ block_size = ctx->last_layer_size;
if (!_ncaReadFsSection(ctx, out, block_size, offset)) goto end;
/* Read plaintext area. */ if (!_ncaReadFsSection(ctx, out_u8, block_size, block_start_offset)) goto end;
ret = ncaReadContentFile(nca_ctx, (u8*)out + block_size, read_size - block_size, block_end_offset);
if (!ret) LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#3).", read_size - block_size, \ /* Read plaintext area. Use NCA-relative offset. */
block_end_offset, nca_ctx->content_id_str, ctx->section_num); out_u8 += block_size;
block_start_offset = (block_end_offset + block_size);
block_end_offset = (content_offset + read_size);
block_size = (block_end_offset - block_start_offset);
ret = ncaReadContentFile(nca_ctx, out_u8, block_size, block_start_offset);
if (!ret) LOG_MSG("Failed to read 0x%lX bytes data block at offset 0x%lX from NCA \"%s\" FS section #%u! (plaintext hash layer) (#5).", block_size, block_start_offset, \
nca_ctx->content_id_str, ctx->section_num);
goto end;
} }
return ret;
} }
/* Optimization for reads from plaintext FS sections or reads that are aligned to the AES-CTR / AES-XTS sector size. */ /* Optimization for reads from plaintext FS sections or reads that are aligned to the AES-CTR / AES-XTS sector size. */