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Added exception if same attachment uploaded. Added test

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This commit is contained in:
Richard Green 2017-11-14 16:57:59 +00:00
parent d3c7f90995
commit d84e9aab7b
5 changed files with 124 additions and 51 deletions
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14
core/src/main/kotlin/net/corda/core/node/services/AttachmentStorage.kt
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@ -45,6 +45,13 @@ interface AttachmentStorage {
@Throws(FileAlreadyExistsException::class, IOException::class)
fun importAttachment(jar: InputStream, uploader: String, filename: String): AttachmentId
/**
* Inserts or returns Attachment Id of attachment. Does not throw an exception if already uploaded.
* @param jar [InputStream] of Jar file
* @return [AttachmentId] of uploaded attachment
*/
fun importOrGetAttachment(jar: InputStream): AttachmentId
/**
* Searches attachment using given criteria and optional sort rules
* @param criteria Query criteria to use as a filter
@ -53,5 +60,12 @@ interface AttachmentStorage {
* @return List of AttachmentId of attachment matching criteria, sorted according to given sorting parameter
*/
fun queryAttachments(criteria: AttachmentQueryCriteria, sorting: AttachmentSort? = null): List<AttachmentId>
/**
* Searches for an attachment already in the store
* @param attachmentId The attachment Id
* @return true if it's in there
*/
fun hasAttachment(attachmentId: AttachmentId): Boolean
}

12
node/src/main/kotlin/net/corda/node/internal/cordapp/CordappProviderImpl.kt
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@ -2,18 +2,24 @@ package net.corda.node.internal.cordapp
import com.google.common.collect.HashBiMap
import net.corda.core.contracts.ContractClassName
import net.corda.core.crypto.SecureHash
import net.corda.core.node.services.AttachmentStorage
import net.corda.core.cordapp.Cordapp
import net.corda.core.cordapp.CordappContext
import net.corda.core.crypto.SecureHash
import net.corda.core.node.services.AttachmentId
import net.corda.core.node.services.AttachmentStorage
import net.corda.core.serialization.SingletonSerializeAsToken
import net.corda.core.utilities.loggerFor
import java.net.URL
/**
* Cordapp provider and store. For querying CorDapps for their attachment and vice versa.
*/
open class CordappProviderImpl(private val cordappLoader: CordappLoader, attachmentStorage: AttachmentStorage) : SingletonSerializeAsToken(), CordappProviderInternal {
companion object {
private val log = loggerFor<CordappProviderImpl>()
}
override fun getAppContext(): CordappContext {
// TODO: Use better supported APIs in Java 9
Exception().stackTrace.forEach { stackFrame ->
@ -45,7 +51,7 @@ open class CordappProviderImpl(private val cordappLoader: CordappLoader, attachm
private fun loadContractsIntoAttachmentStore(attachmentStorage: AttachmentStorage): Map<SecureHash, URL> {
val cordappsWithAttachments = cordapps.filter { !it.contractClassNames.isEmpty() }.map { it.jarPath }
val attachmentIds = cordappsWithAttachments.map { it.openStream().use { attachmentStorage.importAttachment(it) } }
val attachmentIds = cordappsWithAttachments.map { it.openStream().use { attachmentStorage.importOrGetAttachment(it) }}
return attachmentIds.zip(cordappsWithAttachments).toMap()
}

102
node/src/main/kotlin/net/corda/node/services/persistence/NodeAttachmentService.kt
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@ -1,18 +1,19 @@
package net.corda.node.services.persistence
import com.codahale.metrics.MetricRegistry
import net.corda.core.internal.VisibleForTesting
import com.google.common.hash.HashCode
import com.google.common.hash.Hashing
import com.google.common.hash.HashingInputStream
import com.google.common.io.CountingInputStream
import net.corda.core.CordaRuntimeException
import net.corda.core.contracts.*
import net.corda.core.internal.AbstractAttachment
import net.corda.core.contracts.Attachment
import net.corda.core.crypto.SecureHash
import net.corda.core.internal.AbstractAttachment
import net.corda.core.internal.VisibleForTesting
import net.corda.core.node.services.AttachmentId
import net.corda.core.node.services.AttachmentStorage
import net.corda.core.node.services.vault.*
import net.corda.core.node.services.vault.AttachmentQueryCriteria
import net.corda.core.node.services.vault.AttachmentSort
import net.corda.core.serialization.*
import net.corda.core.utilities.contextLogger
import net.corda.node.services.vault.HibernateAttachmentQueryCriteriaParser
@ -25,7 +26,6 @@ import java.time.Instant
import java.util.jar.JarInputStream
import javax.annotation.concurrent.ThreadSafe
import javax.persistence.*
import javax.persistence.Column
/**
* Stores attachments using Hibernate to database.
@ -33,6 +33,29 @@ import javax.persistence.Column
@ThreadSafe
class NodeAttachmentService(metrics: MetricRegistry) : AttachmentStorage, SingletonSerializeAsToken() {
companion object {
private val log = contextLogger()
// Just iterate over the entries with verification enabled: should be good enough to catch mistakes.
// Note that JarInputStream won't throw any kind of error at all if the file stream is in fact not
// a ZIP! It'll just pretend it's an empty archive, which is kind of stupid but that's how it works.
// So we have to check to ensure we found at least one item.
private fun checkIsAValidJAR(stream: InputStream) {
val jar = JarInputStream(stream, true)
var count = 0
while (true) {
val cursor = jar.nextJarEntry ?: break
val entryPath = Paths.get(cursor.name)
// Security check to stop zips trying to escape their rightful place.
require(!entryPath.isAbsolute) { "Path $entryPath is absolute" }
require(entryPath.normalize() == entryPath) { "Path $entryPath is not normalised" }
require(!('\\' in cursor.name || cursor.name == "." || cursor.name == "..")) { "Bad character in $entryPath" }
count++
}
require(count > 0) { "Stream is either empty or not a JAR/ZIP" }
}
}
@Entity
@Table(name = "${NODE_DATABASE_PREFIX}attachments",
indexes = arrayOf(Index(name = "att_id_idx", columnList = "att_id")))
@ -55,10 +78,6 @@ class NodeAttachmentService(metrics: MetricRegistry) : AttachmentStorage, Single
var filename: String? = null
) : Serializable
companion object {
private val log = contextLogger()
}
@VisibleForTesting
var checkAttachmentsOnLoad = true
@ -170,6 +189,24 @@ class NodeAttachmentService(metrics: MetricRegistry) : AttachmentStorage, Single
return import(jar, uploader, filename)
}
fun getAttachmentIdAndBytes(jar: InputStream): Pair<AttachmentId, ByteArray> {
val hs = HashingInputStream(Hashing.sha256(), jar)
val bytes = hs.readBytes()
checkIsAValidJAR(ByteArrayInputStream(bytes))
val id = SecureHash.SHA256(hs.hash().asBytes())
return Pair(id, bytes)
}
override fun hasAttachment(attachmentId: AttachmentId): Boolean {
val session = currentDBSession()
val criteriaBuilder = session.criteriaBuilder
val criteriaQuery = criteriaBuilder.createQuery(Long::class.java)
val attachments = criteriaQuery.from(NodeAttachmentService.DBAttachment::class.java)
criteriaQuery.select(criteriaBuilder.count(criteriaQuery.from(NodeAttachmentService.DBAttachment::class.java)))
criteriaQuery.where(criteriaBuilder.equal(attachments.get<String>(DBAttachment::attId.name), attachmentId.toString()))
return (session.createQuery(criteriaQuery).singleResult > 0)
}
// TODO: PLT-147: The attachment should be randomised to prevent brute force guessing and thus privacy leaks.
private fun import(jar: InputStream, uploader: String?, filename: String?): AttachmentId {
require(jar !is JarInputStream)
@ -179,27 +216,28 @@ class NodeAttachmentService(metrics: MetricRegistry) : AttachmentStorage, Single
// To do this we must pipe stream into the database without knowing its hash, which we will learn only once
// the insert/upload is complete. We can then query to see if it's a duplicate and if so, erase, and if not
// set the hash field of the new attachment record.
val hs = HashingInputStream(Hashing.sha256(), jar)
val bytes = hs.readBytes()
checkIsAValidJAR(ByteArrayInputStream(bytes))
val id = SecureHash.SHA256(hs.hash().asBytes())
val session = currentDBSession()
val criteriaBuilder = session.criteriaBuilder
val criteriaQuery = criteriaBuilder.createQuery(Long::class.java)
val attachments = criteriaQuery.from(NodeAttachmentService.DBAttachment::class.java)
criteriaQuery.select(criteriaBuilder.count(criteriaQuery.from(NodeAttachmentService.DBAttachment::class.java)))
criteriaQuery.where(criteriaBuilder.equal(attachments.get<String>(DBAttachment::attId.name), id.toString()))
val count = session.createQuery(criteriaQuery).singleResult
if (count == 0L) {
val (id, bytes) = getAttachmentIdAndBytes(jar)
if (!hasAttachment(id)) {
checkIsAValidJAR(ByteArrayInputStream(bytes))
val session = currentDBSession()
val attachment = NodeAttachmentService.DBAttachment(attId = id.toString(), content = bytes, uploader = uploader, filename = filename)
session.save(attachment)
attachmentCount.inc()
log.info("Stored new attachment $id")
return id
} else {
throw java.nio.file.FileAlreadyExistsException(id.toString())
}
}
return id
override fun importOrGetAttachment(jar: InputStream): AttachmentId {
try {
return importAttachment(jar)
}
catch (faee: java.nio.file.FileAlreadyExistsException) {
return AttachmentId.parse(faee.message!!)
}
}
override fun queryAttachments(criteria: AttachmentQueryCriteria, sorting: AttachmentSort?): List<AttachmentId> {
@ -226,22 +264,4 @@ class NodeAttachmentService(metrics: MetricRegistry) : AttachmentStorage, Single
}
private fun checkIsAValidJAR(stream: InputStream) {
// Just iterate over the entries with verification enabled: should be good enough to catch mistakes.
// Note that JarInputStream won't throw any kind of error at all if the file stream is in fact not
// a ZIP! It'll just pretend it's an empty archive, which is kind of stupid but that's how it works.
// So we have to check to ensure we found at least one item.
val jar = JarInputStream(stream, true)
var count = 0
while (true) {
val cursor = jar.nextJarEntry ?: break
val entryPath = Paths.get(cursor.name)
// Security check to stop zips trying to escape their rightful place.
require(!entryPath.isAbsolute) { "Path $entryPath is absolute" }
require(entryPath.normalize() == entryPath) { "Path $entryPath is not normalised" }
require(!('\\' in cursor.name || cursor.name == "." || cursor.name == "..")) { "Bad character in $entryPath" }
count++
}
require(count > 0) { "Stream is either empty or not a JAR/ZIP" }
}
}

12
node/src/test/kotlin/net/corda/node/CordaRPCOpsImplTest.kt
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@ -241,6 +241,18 @@ class CordaRPCOpsImplTest {
}
}
@Test
fun `can't upload the same attachment`() {
withPermissions(invokeRpc(CordaRPCOps::uploadAttachment), invokeRpc(CordaRPCOps::attachmentExists)) {
assertThatExceptionOfType(java.nio.file.FileAlreadyExistsException::class.java).isThrownBy {
val inputJar1 = Thread.currentThread().contextClassLoader.getResourceAsStream(testJar)
val inputJar2 = Thread.currentThread().contextClassLoader.getResourceAsStream(testJar)
val secureHash1 = rpc.uploadAttachment(inputJar1)
val secureHash2 = rpc.uploadAttachment(inputJar2)
}
}
}
@Test
fun `can download an uploaded attachment`() {
withPermissions(invokeRpc(CordaRPCOps::uploadAttachment), invokeRpc(CordaRPCOps::openAttachment)) {

35
testing/test-utils/src/main/kotlin/net/corda/testing/node/MockAttachmentStorage.kt
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@ -11,21 +11,25 @@ import net.corda.core.node.services.vault.AttachmentSort
import net.corda.core.serialization.SingletonSerializeAsToken
import java.io.ByteArrayOutputStream
import java.io.InputStream
import java.util.HashMap
import java.util.*
import java.util.jar.JarInputStream
class MockAttachmentStorage : AttachmentStorage, SingletonSerializeAsToken() {
override fun importAttachment(jar: InputStream): AttachmentId {
// JIS makes read()/readBytes() return bytes of the current file, but we want to hash the entire container here.
require(jar !is JarInputStream)
val bytes = run {
companion object {
fun getBytes(jar: InputStream) = run {
val s = ByteArrayOutputStream()
jar.copyTo(s)
s.close()
s.toByteArray()
}
}
override fun importAttachment(jar: InputStream): AttachmentId {
// JIS makes read()/readBytes() return bytes of the current file, but we want to hash the entire container here.
require(jar !is JarInputStream)
val bytes = getBytes(jar)
val sha256 = bytes.sha256()
if (!files.containsKey(sha256)) {
files[sha256] = bytes
@ -49,4 +53,21 @@ class MockAttachmentStorage : AttachmentStorage, SingletonSerializeAsToken() {
override fun queryAttachments(criteria: AttachmentQueryCriteria, sorting: AttachmentSort?): List<AttachmentId> {
throw NotImplementedError("Querying for attachments not implemented")
}
override fun hasAttachment(attachmentId: AttachmentId) = files.containsKey(attachmentId)
fun getAttachmentIdAndBytes(jar: InputStream): Pair<AttachmentId, ByteArray> {
val bytes = getBytes(jar)
return Pair(bytes.sha256(), bytes)
}
override fun importOrGetAttachment(jar: InputStream): AttachmentId {
try {
return importAttachment(jar)
}
catch (faee: java.nio.file.FileAlreadyExistsException) {
return AttachmentId.parse(faee.message!!)
}
}
}