basic keystore implementation

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

core/commands/keystore.go

@@ -0,0 +1,158 @@
+package commands
+
+import (
+	"crypto/rand"
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+
+	cmds "github.com/ipfs/go-ipfs/commands"
+
+	peer "gx/ipfs/QmfMmLGoKzCHDN7cGgk64PJr4iipzidDRME8HABSJqvmhC/go-libp2p-peer"
+	ci "gx/ipfs/QmfWDLQjGjVe4fr5CoztYW2DYYjRysMJrFe1RCsXLPTf46/go-libp2p-crypto"
+)
+
+var KeyCmd = &cmds.Command{
+	Helptext: cmds.HelpText{
+		Tagline: "Create and manipulate keypairs",
+	},
+	Subcommands: map[string]*cmds.Command{
+		"gen":  KeyGenCmd,
+		"list": KeyListCmd,
+	},
+}
+
+type KeyOutput struct {
+	Name string
+	Id   string
+}
+
+var KeyGenCmd = &cmds.Command{
+	Helptext: cmds.HelpText{
+		Tagline: "Create a new keypair",
+	},
+	Options: []cmds.Option{
+		cmds.StringOption("type", "t", "type of the key to create"),
+		cmds.IntOption("size", "s", "size of the key to generate"),
+	},
+	Arguments: []cmds.Argument{
+		cmds.StringArg("name", true, false, "name of key to create"),
+	},
+	Run: func(req cmds.Request, res cmds.Response) {
+		n, err := req.InvocContext().GetNode()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		typ, f, err := req.Option("type").String()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		if !f {
+			res.SetError(fmt.Errorf("please specify a key type with --type"), cmds.ErrNormal)
+			return
+		}
+
+		size, sizefound, err := req.Option("size").Int()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		name := req.Arguments()[0]
+		if name == "self" {
+			res.SetError(fmt.Errorf("cannot create key with name 'self'"), cmds.ErrNormal)
+			return
+		}
+
+		var sk ci.PrivKey
+		var pk ci.PubKey
+
+		switch typ {
+		case "rsa":
+			if !sizefound {
+				res.SetError(fmt.Errorf("please specify a key size with --size"), cmds.ErrNormal)
+				return
+			}
+
+			priv, pub, err := ci.GenerateKeyPairWithReader(ci.RSA, size, rand.Reader)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+
+			sk = priv
+			pk = pub
+		case "ed25519":
+			priv, pub, err := ci.GenerateEd25519Key(rand.Reader)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+
+			sk = priv
+			pk = pub
+		default:
+			res.SetError(fmt.Errorf("unrecognized key type: %s", typ), cmds.ErrNormal)
+			return
+		}
+
+		err = n.Repo.Keystore().Put(name, sk)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		pid, err := peer.IDFromPublicKey(pk)
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		res.SetOutput(&KeyOutput{
+			Name: name,
+			Id:   pid.Pretty(),
+		})
+	},
+	Marshalers: cmds.MarshalerMap{
+		cmds.Text: func(res cmds.Response) (io.Reader, error) {
+			k, ok := res.Output().(*KeyOutput)
+			if !ok {
+				return nil, fmt.Errorf("expected a KeyOutput as command result")
+			}
+
+			return strings.NewReader(k.Id), nil
+		},
+	},
+	Type: KeyOutput{},
+}
+
+var KeyListCmd = &cmds.Command{
+	Helptext: cmds.HelpText{
+		Tagline: "List all local keypairs",
+	},
+	Run: func(req cmds.Request, res cmds.Response) {
+		n, err := req.InvocContext().GetNode()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		keys, err := n.Repo.Keystore().List()
+		if err != nil {
+			res.SetError(err, cmds.ErrNormal)
+			return
+		}
+
+		sort.Strings(keys)
+		res.SetOutput(&stringList{keys})
+	},
+	Marshalers: cmds.MarshalerMap{
+		cmds.Text: stringListMarshaler,
+	},
+	Type: stringList{},
+}

core/commands/publish.go

@@ -56,6 +56,7 @@ Publish an <ipfs-path> to another public key (not implemented):
     This accepts durations such as "300s", "1.5h" or "2h45m". Valid time units are
     "ns", "us" (or "µs"), "ms", "s", "m", "h".`).Default("24h"),
 		cmds.StringOption("ttl", "Time duration this record should be cached for (caution: experimental)."),
+		cmds.StringOption("key", "k", "name of key to use").Default("self"),
 	},
 	Run: func(req cmds.Request, res cmds.Response) {
 		log.Debug("begin publish")
@@ -109,7 +110,20 @@ Publish an <ipfs-path> to another public key (not implemented):
 			ctx = context.WithValue(ctx, "ipns-publish-ttl", d)
 		}
 
-		output, err := publish(ctx, n, n.PrivateKey, path.Path(pstr), popts)
+		var k crypto.PrivKey
+		kname, _, _ := req.Option("key").String()
+		if kname == "self" {
+			k = n.PrivateKey
+		} else {
+			ksk, err := n.Repo.Keystore().Get(kname)
+			if err != nil {
+				res.SetError(err, cmds.ErrNormal)
+				return
+			}
+			k = ksk
+		}
+
+		output, err := publish(ctx, n, k, path.Path(pstr), popts)
 		if err != nil {
 			res.SetError(err, cmds.ErrNormal)
 			return

core/commands/root.go

@@ -103,6 +103,7 @@ var rootSubcommands = map[string]*cmds.Command{
 	"files":     files.FilesCmd,
 	"get":       GetCmd,
 	"id":        IDCmd,
+	"key":       KeyCmd,
 	"log":       LogCmd,
 	"ls":        LsCmd,
 	"mount":     MountCmd,

keystore/keystore.go

@@ -0,0 +1,123 @@
+package keystore
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	ci "gx/ipfs/QmfWDLQjGjVe4fr5CoztYW2DYYjRysMJrFe1RCsXLPTf46/go-libp2p-crypto"
+)
+
+type Keystore interface {
+	Put(string, ci.PrivKey) error
+	Get(string) (ci.PrivKey, error)
+	Delete(string) error
+	List() ([]string, error)
+}
+
+var ErrNoSuchKey = fmt.Errorf("no key by the given name was found")
+var ErrKeyExists = fmt.Errorf("key by that name already exists, refusing to overwrite")
+
+type FSKeystore struct {
+	dir string
+}
+
+func validateName(name string) error {
+	if name == "" {
+		return fmt.Errorf("key names must be at least one character")
+	}
+
+	if strings.Contains(name, "/") {
+		return fmt.Errorf("key names may not contain slashes")
+	}
+
+	if strings.HasPrefix(name, ".") {
+		return fmt.Errorf("key names may not begin with a period")
+	}
+
+	return nil
+}
+
+func NewFSKeystore(dir string) (*FSKeystore, error) {
+	_, err := os.Stat(dir)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return nil, err
+		}
+		if err := os.Mkdir(dir, 0700); err != nil {
+			return nil, err
+		}
+	}
+
+	return &FSKeystore{dir}, nil
+}
+
+func (ks *FSKeystore) Put(name string, k ci.PrivKey) error {
+	if err := validateName(name); err != nil {
+		return err
+	}
+
+	b, err := k.Bytes()
+	if err != nil {
+		return err
+	}
+
+	kp := filepath.Join(ks.dir, name)
+
+	_, err = os.Stat(kp)
+	if err == nil {
+		return ErrKeyExists
+	}
+
+	fi, err := os.Create(kp)
+	if err != nil {
+		return err
+	}
+	defer fi.Close()
+
+	_, err = fi.Write(b)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (ks *FSKeystore) Get(name string) (ci.PrivKey, error) {
+	if err := validateName(name); err != nil {
+		return nil, err
+	}
+
+	kp := filepath.Join(ks.dir, name)
+
+	data, err := ioutil.ReadFile(kp)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, ErrNoSuchKey
+		}
+		return nil, err
+	}
+
+	return ci.UnmarshalPrivateKey(data)
+}
+
+func (ks *FSKeystore) Delete(name string) error {
+	if err := validateName(name); err != nil {
+		return err
+	}
+
+	kp := filepath.Join(ks.dir, name)
+
+	return os.Remove(kp)
+}
+
+func (ks *FSKeystore) List() ([]string, error) {
+	dir, err := os.Open(ks.dir)
+	if err != nil {
+		return nil, err
+	}
+
+	return dir.Readdirnames(0)
+}

keystore/memkeystore.go

@@ -0,0 +1,55 @@
+package keystore
+
+import ci "gx/ipfs/QmfWDLQjGjVe4fr5CoztYW2DYYjRysMJrFe1RCsXLPTf46/go-libp2p-crypto"
+
+type MemKeystore struct {
+	keys map[string]ci.PrivKey
+}
+
+func NewMemKeystore() *MemKeystore {
+	return &MemKeystore{make(map[string]ci.PrivKey)}
+}
+
+func (mk *MemKeystore) Put(name string, k ci.PrivKey) error {
+	if err := validateName(name); err != nil {
+		return err
+	}
+
+	_, ok := mk.keys[name]
+	if ok {
+		return ErrKeyExists
+	}
+
+	mk.keys[name] = k
+	return nil
+}
+
+func (mk *MemKeystore) Get(name string) (ci.PrivKey, error) {
+	if err := validateName(name); err != nil {
+		return nil, err
+	}
+
+	k, ok := mk.keys[name]
+	if !ok {
+		return nil, ErrNoSuchKey
+	}
+
+	return k, nil
+}
+
+func (mk *MemKeystore) Delete(name string) error {
+	if err := validateName(name); err != nil {
+		return err
+	}
+
+	delete(mk.keys, name)
+	return nil
+}
+
+func (mk *MemKeystore) List() ([]string, error) {
+	out := make([]string, 0, len(mk.keys))
+	for k, _ := range mk.keys {
+		out = append(out, k)
+	}
+	return out, nil
+}