rbd: add EncryptionLoad2 implementing rbd_encryption_load2

Add a new Image method EncryptionLoad2 implementing rbd_encryption_load2.
This method adds the ability to have different encryption schemes across
parent images.

Signed-off-by: John Mulligan <[email protected]>
Fixes: ceph#1059

Author: phlogistonjohn

Diff for: docs/api-status.json

@@ -1953,6 +1953,12 @@
         "comment": "GroupSnapGetInfo returns a slice of RBD image snapshots that are part of a\ngroup snapshot.\n\nImplements:\n\n\tint rbd_group_snap_get_info(rados_ioctx_t group_p,\n\t                        const char *group_name,\n\t                        const char *snap_name,\n\t                        rbd_group_snap_info2_t *snaps);\n",
         "added_in_version": "v0.30.0",
         "expected_stable_version": "v0.32.0"
+      },
+      {
+        "name": "Image.EncryptionLoad2",
+        "comment": "EncryptionLoad2 enables IO on an open encrypted image. The difference\nbetween EncryptionLoad and EncryptionLoad2 is that EncryptionLoad2 can open\nancestor images with a different encryption options than the current image.\nThe first EncryptionOptions in the slice is applied to the current image,\nthe second to the first ancestor, the third to the second ancestor and so\non.  If the length of the slice is smaller than the number of ancestors the\nfinal item in the slice will be applied to all remaining ancestors, or if\nthe ancestor does not match the encryption format the ancestor will be\ninterpreted as plain-text.\n\nImplements:\n\n\tint rbd_encryption_load2(rbd_image_t image,\n\t                         const rbd_encryption_spec_t *specs,\n\t                         size_t spec_count);\n",
+        "added_in_version": "$NEXT_RELEASE",
+        "expected_stable_version": "$NEXT_RELEASE_STABLE"
       }
     ]
   },

Diff for: docs/api-status.md

@@ -25,6 +25,7 @@ Conn.GetAddrs | v0.31.0 | v0.33.0 |
 Name | Added in Version | Expected Stable Version | 
 ---- | ---------------- | ----------------------- | 
 GroupSnapGetInfo | v0.30.0 | v0.32.0 | 
+Image.EncryptionLoad2 | $NEXT_RELEASE | $NEXT_RELEASE_STABLE | 
 
 ### Deprecated APIs
 

Diff for: rbd/encryption_load2.go

@@ -0,0 +1,67 @@
+//go:build !octopus && !pacific && !quincy && ceph_preview
+
+package rbd
+
+// #cgo LDFLAGS: -lrbd
+// /* force XSI-complaint strerror_r() */
+// #define _POSIX_C_SOURCE 200112L
+// #undef _GNU_SOURCE
+// #include <rbd/librbd.h>
+import "C"
+
+import (
+	"unsafe"
+)
+
+// toEncryptionSpec returns a rbd_encryption_spec_t converted from the
+// cEncryptionData type.
+func (edata cEncryptionData) toEncryptionSpec() C.rbd_encryption_spec_t {
+	var cSpec C.rbd_encryption_spec_t
+	cSpec.format = edata.format
+	cSpec.opts = edata.opts
+	cSpec.opts_size = edata.optsSize
+	return cSpec
+}
+
+// EncryptionLoad2 enables IO on an open encrypted image. The difference
+// between EncryptionLoad and EncryptionLoad2 is that EncryptionLoad2 can open
+// ancestor images with a different encryption options than the current image.
+// The first EncryptionOptions in the slice is applied to the current image,
+// the second to the first ancestor, the third to the second ancestor and so
+// on.  If the length of the slice is smaller than the number of ancestors the
+// final item in the slice will be applied to all remaining ancestors, or if
+// the ancestor does not match the encryption format the ancestor will be
+// interpreted as plain-text.
+//
+// Implements:
+//
+//	int rbd_encryption_load2(rbd_image_t image,
+//	                         const rbd_encryption_spec_t *specs,
+//	                         size_t spec_count);
+func (image *Image) EncryptionLoad2(opts []EncryptionOptions) error {
+	if image.image == nil {
+		return ErrImageNotOpen
+	}
+
+	length := len(opts)
+	eos := make([]cEncryptionData, length)
+	cspecs := (*C.rbd_encryption_spec_t)(C.malloc(
+		C.size_t(C.sizeof_rbd_encryption_spec_t * length)))
+	specs := unsafe.Slice(cspecs, length)
+
+	for idx, option := range opts {
+		eos[idx] = option.allocateEncryptionOptions()
+		specs[idx] = eos[idx].toEncryptionSpec()
+	}
+	defer func() {
+		for _, eopt := range eos {
+			eopt.free()
+		}
+	}()
+
+	ret := C.rbd_encryption_load2(
+		image.image,
+		cspecs,
+		C.size_t(length))
+	return getError(ret)
+}

Diff for: rbd/encryption_load2_test.go

@@ -0,0 +1,261 @@
+//go:build !octopus && !pacific && !quincy && ceph_preview
+
+package rbd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestEncryptionLoad2(t *testing.T) {
+	conn := radosConnect(t)
+	defer conn.Shutdown()
+
+	poolname := GetUUID()
+	err := conn.MakePool(poolname)
+	assert.NoError(t, err)
+	defer conn.DeletePool(poolname)
+
+	ioctx, err := conn.OpenIOContext(poolname)
+	require.NoError(t, err)
+	defer ioctx.Destroy()
+
+	name := GetUUID()
+	testImageSize := uint64(50) * 1024 * 1024
+	options := NewRbdImageOptions()
+	assert.NoError(t,
+		options.SetUint64(ImageOptionOrder, uint64(testImageOrder)))
+	err = CreateImage(ioctx, name, testImageSize, options)
+	assert.NoError(t, err)
+
+	img, err := OpenImage(ioctx, name, NoSnapshot)
+	assert.NoError(t, err)
+
+	encOpts := EncryptionOptionsLUKS2{
+		Alg:        EncryptionAlgorithmAES256,
+		Passphrase: []byte("test-password"),
+	}
+	err = img.EncryptionFormat(encOpts)
+	assert.NoError(t, err)
+
+	// close the image so we can reopen it and load the encryption info
+	// then write some encrypted data at the end of the image
+	err = img.Close()
+	assert.NoError(t, err)
+	defer func() {
+		assert.NoError(t, img.Remove())
+	}()
+
+	testData := []byte("Jinxed wizards pluck ivy from the big quilt")
+	var offset int64
+
+	t.Run("prepare", func(t *testing.T) {
+		img, err = OpenImage(ioctx, name, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+		err = img.EncryptionLoad2([]EncryptionOptions{encOpts})
+		assert.NoError(t, err)
+
+		stats, err := img.Stat()
+		require.NoError(t, err)
+		offset = int64(stats.Size) - int64(len(testData))
+
+		nOut, err := img.WriteAt(testData, offset)
+		assert.Equal(t, len(testData), nOut)
+		assert.NoError(t, err)
+	})
+
+	t.Run("readEnc", func(t *testing.T) {
+		require.NotEqual(t, offset, 0)
+		// Re-open the image, load the encryption format, and read the encrypted data
+		img, err = OpenImage(ioctx, name, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+		err = img.EncryptionLoad2([]EncryptionOptions{encOpts})
+		assert.NoError(t, err)
+
+		inData := make([]byte, len(testData))
+		nIn, err := img.ReadAt(inData, offset)
+		assert.Equal(t, nIn, len(testData))
+		assert.Equal(t, inData, testData)
+		assert.NoError(t, err)
+	})
+
+	t.Run("noEnc", func(t *testing.T) {
+		require.NotEqual(t, offset, 0)
+		// Re-open the image and attempt to read the encrypted data without loading the encryption
+		img, err = OpenImage(ioctx, name, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+
+		inData := make([]byte, len(testData))
+		nIn, err := img.ReadAt(inData, offset)
+		assert.Equal(t, nIn, len(testData))
+		assert.NotEqual(t, inData, testData)
+		assert.NoError(t, err)
+	})
+}
+
+func TestEncryptionLoad2WithParents(t *testing.T) {
+	dlength := int64(32)
+	testData1 := []byte("Very nice object ahead of change")
+	testData2 := []byte("A nice object encryption applied")
+	testData3 := []byte("A good object encryption abounds")
+	testData4 := []byte("Another portion is here and well")
+	written := [][]byte{}
+	assert.EqualValues(t, len(testData1), dlength)
+	assert.EqualValues(t, len(testData2), dlength)
+	assert.EqualValues(t, len(testData3), dlength)
+	assert.EqualValues(t, len(testData4), dlength)
+
+	encOpts1 := EncryptionOptionsLUKS1{
+		Alg:        EncryptionAlgorithmAES128,
+		Passphrase: []byte("test-password"),
+	}
+	encOpts2 := EncryptionOptionsLUKS2{
+		Alg:        EncryptionAlgorithmAES128,
+		Passphrase: []byte("test-password"),
+	}
+	encOpts3 := EncryptionOptionsLUKS2{
+		Alg:        EncryptionAlgorithmAES256,
+		Passphrase: []byte("something-stronger"),
+	}
+
+	conn := radosConnect(t)
+	defer conn.Shutdown()
+
+	poolname := GetUUID()
+	err := conn.MakePool(poolname)
+	assert.NoError(t, err)
+	defer conn.DeletePool(poolname)
+
+	ioctx, err := conn.OpenIOContext(poolname)
+	require.NoError(t, err)
+	defer ioctx.Destroy()
+
+	name := GetUUID()
+	testImageSize := uint64(256) * 1024 * 1024
+	options := NewRbdImageOptions()
+	assert.NoError(t,
+		options.SetUint64(ImageOptionOrder, uint64(testImageOrder)))
+	err = CreateImage(ioctx, name, testImageSize, options)
+	assert.NoError(t, err)
+
+	t.Run("prepare", func(t *testing.T) {
+		img, err := OpenImage(ioctx, name, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+
+		_, err = img.WriteAt(testData1, 0)
+		assert.NoError(t, err)
+		written = append(written, testData1)
+	})
+
+	t.Run("createClone1", func(t *testing.T) {
+		require.Len(t, written, 1)
+		parent, err := OpenImage(ioctx, name, NoSnapshot)
+		assert.NoError(t, err)
+		defer parent.Close()
+		snap, err := parent.CreateSnapshot("sn1")
+		assert.NoError(t, err)
+		err = snap.Protect()
+		assert.NoError(t, err)
+
+		err = CloneImage(ioctx, name, "sn1", ioctx, name+"clone1", options)
+		assert.NoError(t, err)
+
+		img, err := OpenImage(ioctx, name+"clone1", NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+		err = img.EncryptionFormat(encOpts1)
+		assert.NoError(t, err)
+
+		err = img.EncryptionLoad2([]EncryptionOptions{encOpts1})
+		assert.NoError(t, err)
+		_, err = img.WriteAt(testData2, dlength)
+		assert.NoError(t, err)
+		written = append(written, testData2)
+	})
+
+	t.Run("createClone2", func(t *testing.T) {
+		require.Len(t, written, 2)
+		parentName := name + "clone1"
+		cloneName := name + "clone2"
+
+		parent, err := OpenImage(ioctx, parentName, NoSnapshot)
+		assert.NoError(t, err)
+		defer parent.Close()
+		snap, err := parent.CreateSnapshot("sn2")
+		assert.NoError(t, err)
+		err = snap.Protect()
+		assert.NoError(t, err)
+
+		err = CloneImage(ioctx, parentName, "sn2", ioctx, cloneName, options)
+		assert.NoError(t, err)
+
+		img, err := OpenImage(ioctx, cloneName, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+		err = img.EncryptionFormat(encOpts2)
+		assert.NoError(t, err)
+
+		err = img.EncryptionLoad2([]EncryptionOptions{encOpts2, encOpts1})
+		assert.NoError(t, err)
+		_, err = img.WriteAt(testData3, dlength*2)
+		assert.NoError(t, err)
+		written = append(written, testData3)
+	})
+
+	t.Run("createClone3", func(t *testing.T) {
+		require.Len(t, written, 3)
+		parentName := name + "clone2"
+		cloneName := name + "clone3"
+
+		parent, err := OpenImage(ioctx, parentName, NoSnapshot)
+		assert.NoError(t, err)
+		defer parent.Close()
+		snap, err := parent.CreateSnapshot("sn3")
+		assert.NoError(t, err)
+		err = snap.Protect()
+		assert.NoError(t, err)
+
+		err = CloneImage(ioctx, parentName, "sn3", ioctx, cloneName, options)
+		assert.NoError(t, err)
+
+		img, err := OpenImage(ioctx, cloneName, NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+		err = img.EncryptionFormat(encOpts3)
+		assert.NoError(t, err)
+
+		err = img.EncryptionLoad2([]EncryptionOptions{
+			encOpts3, encOpts2, encOpts1,
+		})
+		assert.NoError(t, err)
+		_, err = img.WriteAt(testData4, dlength*3)
+		assert.NoError(t, err)
+		written = append(written, testData4)
+	})
+
+	t.Run("readAll", func(t *testing.T) {
+		require.Len(t, written, 4)
+		img, err := OpenImage(ioctx, name+"clone3", NoSnapshot)
+		assert.NoError(t, err)
+		defer img.Close()
+
+		err = img.EncryptionLoad2([]EncryptionOptions{
+			encOpts3, encOpts2, encOpts1,
+		})
+		assert.NoError(t, err)
+
+		inData := make([]byte, int(dlength))
+		for idx, td := range written {
+			n, err := img.ReadAt(inData, int64(idx)*dlength)
+			assert.NoError(t, err)
+			assert.EqualValues(t, dlength, n)
+			assert.Equal(t, inData, td)
+		}
+	})
+}