storage: Allow inputvol to be encrypted

https://bugzilla.redhat.com/show_bug.cgi?id=1613737

When processing the inputvol for encryption, we need to handle
the case where the inputvol is encrypted. This then allows for
the encrypted inputvol to be used either for an output encrypted
volume or an output volume of some XML provided type.

Add tests to show the various conversion options when either input
or output is encrypted. This includes when both are encrypted.

Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>

src/storage/storage_util.c

@@ -1084,6 +1084,7 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
                                          unsigned int flags,
                                          const char *create_tool,
                                          const char *secretPath,
+                                         const char *inputSecretPath,
                                          virStorageVolEncryptConvertStep convertStep)
 {
     virCommandPtr cmd = NULL;
@@ -1101,6 +1102,8 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
         .secretAlias = NULL,
     };
     virStorageEncryptionPtr enc = vol->target.encryption;
+    char *inputSecretAlias = NULL;
+    virStorageEncryptionPtr inputenc = inputvol ? inputvol->target.encryption : NULL;
     virStorageEncryptionInfoDefPtr encinfo = NULL;
 
     virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, NULL);
@@ -1114,6 +1117,12 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
         goto error;
     }
 
+    if (inputenc && inputenc->format != VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("encryption format of inputvol must be LUKS"));
+        goto error;
+    }
+
     if (virStorageBackendCreateQemuImgSetInfo(pool, vol, inputvol,
                                               convertStep, &info) < 0)
         goto error;
@@ -1153,6 +1162,20 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
         encinfo = &enc->encinfo;
     }
 
+    if (inputenc && convertStep == VIR_STORAGE_VOL_ENCRYPT_CONVERT) {
+        if (!inputSecretPath) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("path to inputvol secret data file is required"));
+            goto error;
+        }
+        if (virAsprintf(&inputSecretAlias, "%s_encrypt0",
+                        inputvol->name) < 0)
+            goto error;
+        if (storageBackendCreateQemuImgSecretObject(cmd, inputSecretPath,
+                                                    inputSecretAlias) < 0)
+            goto error;
+    }
+
     if (convertStep != VIR_STORAGE_VOL_ENCRYPT_CONVERT) {
         if (storageBackendCreateQemuImgSetOptions(cmd, encinfo, info) < 0)
             goto error;
@@ -1163,20 +1186,33 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
             virCommandAddArgFormat(cmd, "%lluK", info.size_arg);
     } else {
         /* source */
+        if (inputenc)
+            virCommandAddArgFormat(cmd,
+                                   "driver=luks,file.filename=%s,key-secret=%s",
+                                   info.inputPath, inputSecretAlias);
+        else
             virCommandAddArgFormat(cmd, "driver=%s,file.filename=%s",
                                    info.inputType ? info.inputType : "raw",
                                    info.inputPath);
 
         /* dest */
-        virCommandAddArgFormat(cmd, "driver=%s,file.filename=%s,key-secret=%s",
+        if (enc)
+            virCommandAddArgFormat(cmd,
+                                   "driver=%s,file.filename=%s,key-secret=%s",
                                    info.type, info.path, info.secretAlias);
+        else
+            virCommandAddArgFormat(cmd, "driver=%s,file.filename=%s",
+                                   info.type, info.path);
+
     }
     VIR_FREE(info.secretAlias);
+    VIR_FREE(inputSecretAlias);
 
     return cmd;
 
  error:
     VIR_FREE(info.secretAlias);
+    VIR_FREE(inputSecretAlias);
     virCommandFree(cmd);
     return NULL;
 }
@@ -1262,6 +1298,7 @@ storageBackendDoCreateQemuImg(virStoragePoolObjPtr pool,
                               unsigned int flags,
                               const char *create_tool,
                               const char *secretPath,
+                              const char *inputSecretPath,
                               virStorageVolEncryptConvertStep convertStep)
 {
     int ret;
@@ -1269,7 +1306,8 @@ storageBackendDoCreateQemuImg(virStoragePoolObjPtr pool,
 
     cmd = virStorageBackendCreateQemuImgCmdFromVol(pool, vol, inputvol,
                                                    flags, create_tool,
-                                                   secretPath, convertStep);
+                                                   secretPath, inputSecretPath,
+                                                   convertStep);
     if (!cmd)
         return -1;
 
@@ -1290,6 +1328,7 @@ storageBackendCreateQemuImg(virStoragePoolObjPtr pool,
     int ret = -1;
     char *create_tool;
     char *secretPath = NULL;
+    char *inputSecretPath = NULL;
     virStorageVolEncryptConvertStep convertStep = VIR_STORAGE_VOL_ENCRYPT_NONE;
 
     virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, -1);
@@ -1306,16 +1345,21 @@ storageBackendCreateQemuImg(virStoragePoolObjPtr pool,
         !(secretPath = storageBackendCreateQemuImgSecretPath(pool, vol)))
         goto cleanup;
 
+    if (inputvol && inputvol->target.encryption &&
+        !(inputSecretPath = storageBackendCreateQemuImgSecretPath(pool,
+                                                                  inputvol)))
+        goto cleanup;
+
     /* Using an input file for encryption requires a multi-step process
      * to create an image of the same size as the inputvol and then to
      * convert the inputvol afterwards. */
-    if (secretPath && inputvol)
+    if ((secretPath || inputSecretPath) && inputvol)
         convertStep = VIR_STORAGE_VOL_ENCRYPT_CREATE;
 
     do {
         ret = storageBackendDoCreateQemuImg(pool, vol, inputvol, flags,
                                             create_tool, secretPath,
-                                            convertStep);
+                                            inputSecretPath, convertStep);
 
         /* Failure to convert, attempt to delete what we created */
         if (ret < 0 && convertStep == VIR_STORAGE_VOL_ENCRYPT_CONVERT)
@@ -1337,6 +1381,10 @@ storageBackendCreateQemuImg(virStoragePoolObjPtr pool,
         unlink(secretPath);
         VIR_FREE(secretPath);
     }
+    if (inputSecretPath) {
+        unlink(inputSecretPath);
+        VIR_FREE(inputSecretPath);
+    }
     VIR_FREE(create_tool);
     return ret;
 }

src/storage/storage_util.h

@@ -167,6 +167,7 @@ virStorageBackendCreateQemuImgCmdFromVol(virStoragePoolObjPtr pool,
                                          unsigned int flags,
                                          const char *create_tool,
                                          const char *secretPath,
+                                         const char *inputSecretPath,
                                          virStorageVolEncryptConvertStep convertStep);
 
 int virStorageBackendSCSIFindLUs(virStoragePoolObjPtr pool,

tests/storagevolxml2argvdata/luks-convert-encrypt.argv

@@ -0,0 +1,11 @@
+qemu-img create -f luks \
+--object secret,id=encrypt2.img_encrypt0,file=/path/to/secretFile \
+-o key-secret=encrypt2.img_encrypt0 \
+/var/lib/libvirt/images/encrypt2.img 5242880K
+qemu-img convert --image-opts -n --target-image-opts \
+--object secret,id=encrypt2.img_encrypt0,file=/path/to/secretFile \
+--object secret,id=encrypt1.img_encrypt0,file=/path/to/inputSecretFile \
+driver=luks,file.filename=/var/lib/libvirt/images/encrypt1.img,\
+key-secret=encrypt1.img_encrypt0 \
+driver=luks,file.filename=/var/lib/libvirt/images/encrypt2.img,\
+key-secret=encrypt2.img_encrypt0

tests/storagevolxml2argvdata/luks-convert-encrypt2fileqcow2.argv

@@ -0,0 +1,7 @@
+qemu-img create -f qcow2 \
+-o compat=0.10 /var/lib/libvirt/images/sparse-qcow2.img 1073741824K
+qemu-img convert --image-opts -n --target-image-opts \
+--object secret,id=encrypt2.img_encrypt0,file=/path/to/inputSecretFile \
+driver=luks,file.filename=/var/lib/libvirt/images/encrypt2.img,\
+key-secret=encrypt2.img_encrypt0 \
+driver=qcow2,file.filename=/var/lib/libvirt/images/sparse-qcow2.img

tests/storagevolxml2argvdata/luks-convert-encrypt2fileraw.argv

@@ -0,0 +1,7 @@
+qemu-img create -f raw \
+/var/lib/libvirt/images/sparse.img 1073741824K
+qemu-img convert --image-opts -n --target-image-opts \
+--object secret,id=encrypt2.img_encrypt0,file=/path/to/inputSecretFile \
+driver=luks,file.filename=/var/lib/libvirt/images/encrypt2.img,\
+key-secret=encrypt2.img_encrypt0 \
+driver=raw,file.filename=/var/lib/libvirt/images/sparse.img

tests/storagevolxml2argvtest.c

@@ -85,7 +85,7 @@ testCompareXMLToArgvFiles(bool shouldFail,
      * convert the inputvol afterwards. Since we only care about the
      * command line we have to copy code from storageBackendCreateQemuImg
      * and adjust it for the test needs. */
-    if (inputvol && vol->target.encryption)
+    if (inputvol && (vol->target.encryption || inputvol->target.encryption))
         convertStep = VIR_STORAGE_VOL_ENCRYPT_CREATE;
 
     do {
@@ -93,6 +93,7 @@ testCompareXMLToArgvFiles(bool shouldFail,
                                                        inputvol, flags,
                                                        create_tool,
                                                        "/path/to/secretFile",
+                                                       "/path/to/inputSecretFile",
                                                        convertStep);
         if (!cmd) {
             if (shouldFail) {
@@ -288,6 +289,18 @@ mymain(void)
             "pool-dir", "vol-file-qcow2",
             "luks-convert-qcow2", 0);
 
+    DO_TEST("pool-dir", "vol-encrypt2",
+            "pool-dir", "vol-encrypt1",
+            "luks-convert-encrypt", 0);
+
+    DO_TEST("pool-dir", "vol-file",
+            "pool-dir", "vol-encrypt2",
+            "luks-convert-encrypt2fileraw", 0);
+
+    DO_TEST("pool-dir", "vol-file-qcow2",
+            "pool-dir", "vol-encrypt2",
+            "luks-convert-encrypt2fileqcow2", 0);
+
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }
 

tests/storagevolxml2xmlin/vol-encrypt1.xml

@@ -0,0 +1,21 @@
+<volume>
+  <name>encrypt1.img</name>
+  <key>/var/lib/libvirt/images/encrypt1.img</key>
+  <source>
+  </source>
+  <capacity unit="G">5</capacity>
+  <allocation>294912</allocation>
+  <target>
+    <path>/var/lib/libvirt/images/encrypt1.img</path>
+    <format type='raw'/>
+    <permissions>
+      <mode>0644</mode>
+      <owner>0</owner>
+      <group>0</group>
+      <label>unconfined_u:object_r:virt_image_t:s0</label>
+    </permissions>
+    <encryption format='luks'>
+      <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709a80f4'/>
+    </encryption>
+  </target>
+</volume>

tests/storagevolxml2xmlin/vol-encrypt2.xml

@@ -0,0 +1,21 @@
+<volume>
+  <name>encrypt2.img</name>
+  <key>/var/lib/libvirt/images/encrypt2.img</key>
+  <source>
+  </source>
+  <capacity unit="G">5</capacity>
+  <allocation>294912</allocation>
+  <target>
+    <path>/var/lib/libvirt/images/encrypt2.img</path>
+    <format type='raw'/>
+    <permissions>
+      <mode>0644</mode>
+      <owner>0</owner>
+      <group>0</group>
+      <label>unconfined_u:object_r:virt_image_t:s0</label>
+    </permissions>
+    <encryption format='luks'>
+      <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709af480'/>
+    </encryption>
+  </target>
+</volume>