Make mountable of the decrypted volume

zy0999 · Apr 13, 2021 · c3d4dbc · c3d4dbc
1 parent ceae24f
commit c3d4dbc
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Showing 6 changed files with 16 additions and 4 deletions.
diff --git a/include/dislocker/metadata/metadata.h b/include/dislocker/metadata/metadata.h
@@ -92,5 +92,6 @@ uint64_t dis_metadata_mftmirror(dis_metadata_t dis_meta);
 
 uint32_t dis_metadata_backup_sectors_count(dis_metadata_t dis_meta);
 
+int dis_metadata_is_decrypted_state(dis_metadata_t dis_meta);
 
 #endif // METADATA_H
diff --git a/include/dislocker/metadata/metadata_config.h b/include/dislocker/metadata/metadata_config.h
@@ -51,6 +51,9 @@ struct _dis_metadata_config {
 	/* States dislocker's metadata initialisation is at or will be stopped at */
 	dis_state_e   curr_state;
 	dis_state_e   init_stop_at;
+
+	/* Readonly mode for EOW support */
+	int readonly;
 };
 
 

diff --git a/src/dislocker-metadata.c b/src/dislocker-metadata.c
@@ -131,6 +131,7 @@ int main(int argc, char **argv)
 	dis_meta_cfg = dis_metadata_config_new();
 	dis_meta_cfg->fve_fd       = fve_fd;
 	dis_meta_cfg->offset       = offset;
+	dis_meta_cfg->readonly     = 1;
 
 	dis_metadata = dis_metadata_new(dis_meta_cfg);
 	if(dis_metadata_initialize(dis_metadata) != DIS_RET_SUCCESS)

diff --git a/src/dislocker.c b/src/dislocker.c
@@ -183,6 +183,8 @@ int dis_initialize(dis_context_t dis_ctx)
 		return DIS_RET_ERROR_ALLOC;
 	}
 
+	dis_ctx->metadata->cfg->readonly = (dis_ctx->cfg.flags & DIS_FLAG_READ_ONLY) ? 1 : 0;
+
 	ret = dis_metadata_initialize(dis_ctx->metadata);
 	dis_ctx->curr_state = dis_meta_cfg->curr_state;
 	if(ret != DIS_RET_SUCCESS)
@@ -326,7 +328,7 @@ int dislock(dis_context_t dis_ctx, uint8_t* buffer, off_t offset, size_t size)
 		return -EFAULT;
 	}
 
-	if(offset >= (off_t)dis_ctx->io_data.volume_size)
+	if((offset >= (off_t)dis_ctx->io_data.volume_size) && !dis_metadata_is_decrypted_state(dis_ctx->io_data.metadata))
 	{
 		dis_printf(
 			L_ERROR,

diff --git a/src/inouts/prepare.c b/src/inouts/prepare.c
@@ -116,7 +116,7 @@ int prepare_crypt(dis_context_t dis_ctx)
 	 * Get volume size directly from dis_metadata_t, which is more accurate.
 	 */
 	io_data->volume_size = io_data->encrypted_volume_size;
-	if(io_data->volume_size == 0)
+	if(io_data->volume_size == 0 && !dis_metadata_is_decrypted_state(io_data->metadata))
 	{
 		dis_printf(L_ERROR, "Can't initialize the volume's size\n");
 		return DIS_RET_ERROR_VOLUME_SIZE_NOT_FOUND;

diff --git a/src/metadata/metadata.c b/src/metadata/metadata.c
@@ -454,8 +454,10 @@ static int check_volume_header(dis_metadata_t dis_meta, int volume_fd, off_t dis
 			        " failed\n", source);
 		}
 
-		dis_printf(L_ERROR, "EOW volume GUID not supported.\n");
-		return FALSE;
+		if (!dis_meta->cfg->readonly) {
+			dis_printf(L_ERROR, "EOW volume GUID not supported for writing.\n");
+			return FALSE;
+        }
 	}
 	else
 	{
@@ -1325,6 +1327,9 @@ uint32_t dis_metadata_backup_sectors_count(dis_metadata_t dis_meta)
 	return dis_meta->information->nb_backup_sectors;
 }
 
+int dis_metadata_is_decrypted_state(dis_metadata_t dis_meta) {
+	return dis_meta->information->curr_state == METADATA_STATE_DECRYPTED;
+}
 
 #ifdef _HAVE_RUBY
 #include <sys/types.h>