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copy.go
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copy.go
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package binary
import (
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"io/ioutil"
"strings"
"github.com/gopasspw/gopass/pkg/action"
"github.com/gopasspw/gopass/pkg/fsutil"
"github.com/gopasspw/gopass/pkg/store/secret"
"github.com/gopasspw/gopass/pkg/store/sub"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
// Copy copies either from the filesystem to the store or from the store
// to the filesystem
func Copy(ctx context.Context, c *cli.Context, store storer) error {
from := c.Args().Get(0)
to := c.Args().Get(1)
// argument checking is in s.binaryCopy
if err := binaryCopy(ctx, c, from, to, false, store); err != nil {
return action.ExitError(ctx, action.ExitUnknown, err, "%s", err)
}
return nil
}
// Move works like Copy but will remove (shred/wipe) the source
// after a successful copy. Mostly useful for securely moving secrets into
// the store if they are no longer needed / wanted on disk afterwards
func Move(ctx context.Context, c *cli.Context, store storer) error {
from := c.Args().Get(0)
to := c.Args().Get(1)
// argument checking is in s.binaryCopy
if err := binaryCopy(ctx, c, from, to, true, store); err != nil {
return action.ExitError(ctx, action.ExitUnknown, err, "%s", err)
}
return nil
}
// binaryCopy implements the control flow for copy and move. We support two
// workflows:
// 1. From the filesystem to the store
// 2. From the store to the filesystem
//
// Copying secrets in the store must be done through the regular copy command
func binaryCopy(ctx context.Context, c *cli.Context, from, to string, deleteSource bool, store storer) error {
if from == "" || to == "" {
op := "copy"
if deleteSource {
op = "move"
}
return errors.Errorf("Usage: %s %s from to", c.App.Name, op)
}
switch {
case fsutil.IsFile(from) && fsutil.IsFile(to):
// copying from on file to another file is not supported
return errors.New("ambiquity detected. Only from or to can be a file")
case store.Exists(ctx, from+Suffix) && store.Exists(ctx, to+Suffix):
// copying from one secret to another secret is not supported
return errors.New("ambiquity detected. Either from or to must be a file")
case fsutil.IsFile(from) && !fsutil.IsFile(to):
return binaryCopyFromFileToStore(ctx, from, to, deleteSource, store)
case !fsutil.IsFile(from):
return binaryCopyFromStoreToFile(ctx, from, to, deleteSource, store)
default:
return errors.Errorf("ambiquity detected. Unhandled case. Please report a bug")
}
}
func binaryCopyFromFileToStore(ctx context.Context, from, to string, deleteSource bool, store storer) error {
// if the source is a file the destination must no to avoid ambiquities
// if necessary this can be resolved by using a absolute path for the file
// and a relative one for the secret
if !strings.HasSuffix(to, Suffix) {
to += Suffix
}
// copy from FS to store
buf, err := ioutil.ReadFile(from)
if err != nil {
return errors.Wrapf(err, "failed to read file from '%s'", from)
}
if err := store.Set(sub.WithReason(ctx, fmt.Sprintf("Copied data from %s to %s", from, to)), to, secret.New("", base64.StdEncoding.EncodeToString(buf))); err != nil {
return errors.Wrapf(err, "failed to save buffer to store")
}
if !deleteSource {
return nil
}
// it's important that we return if the validation fails, because
// in that case we don't want to shred our (only) copy of this data!
if err := binaryValidate(ctx, buf, to, store); err != nil {
return errors.Wrapf(err, "failed to validate written data")
}
if err := fsutil.Shred(from, 8); err != nil {
return errors.Wrapf(err, "failed to shred data")
}
return nil
}
func binaryCopyFromStoreToFile(ctx context.Context, from, to string, deleteSource bool, store storer) error {
// if the source is no file we assume it's a secret and to is a filename
// (which may already exist or not)
if !strings.HasSuffix(from, Suffix) {
from += Suffix
}
// copy from store to FS
buf, err := binaryGet(ctx, from, store)
if err != nil {
return errors.Wrapf(err, "failed to read data from '%s'", from)
}
if err := ioutil.WriteFile(to, buf, 0600); err != nil {
return errors.Wrapf(err, "failed to write data to '%s'", to)
}
if !deleteSource {
return nil
}
// as before: if validation of the written data fails, we MUST NOT
// delete the (only) source
if err := binaryValidate(ctx, buf, from, store); err != nil {
return errors.Wrapf(err, "failed to validate the written data")
}
if err := store.Delete(ctx, from); err != nil {
return errors.Wrapf(err, "failed to delete '%s' from the store", from)
}
return nil
}
func binaryValidate(ctx context.Context, buf []byte, name string, store storer) error {
h := sha256.New()
_, _ = h.Write(buf)
fileSum := fmt.Sprintf("%x", h.Sum(nil))
h.Reset()
var err error
buf, err = binaryGet(ctx, name, store)
if err != nil {
return errors.Wrapf(err, "failed to read '%s' from the store", name)
}
_, _ = h.Write(buf)
storeSum := fmt.Sprintf("%x", h.Sum(nil))
if fileSum != storeSum {
return errors.Errorf("Hashsum mismatch (file: %s, store: %s)", fileSum, storeSum)
}
return nil
}
func binaryGet(ctx context.Context, name string, store storer) ([]byte, error) {
sec, err := store.Get(ctx, name)
if err != nil {
return nil, errors.Wrapf(err, "failed to read '%s' from the store", name)
}
buf, err := base64.StdEncoding.DecodeString(sec.Body())
if err != nil {
return nil, errors.Wrapf(err, "failed to encode to base64")
}
return buf, nil
}