Ox: Add private key import.

README.md

@@ -83,7 +83,7 @@ If no configuration file is present or if the values should be overridden it is
 the account details via command line options:
 
 ```plain
-Usage: go-sendxmpp [-cdilnt] [-f value] [--help] [--http-upload value] [-j value] [-m value] [--muc-password value] [--ox] [--ox-genprivkey] [--ox-passphrase value] [-p value] [--raw] [-r value] [--timeout value] [--tls-version value] [-u value] [--version] [parameters ...]
+Usage: go-sendxmpp [-cdilnt] [-f value] [--help] [--http-upload value] [-j value] [-m value] [--muc-password value] [--ox] [--ox-genprivkey] [--ox-import-privkey value] [--ox-passphrase value] [-p value] [--raw] [-r value] [--timeout value] [--tls-version value] [-u value] [--version] [parameters ...]
  -c, --chatroom     Send message to a chatroom.
  -d, --debug        Show debugging info.
  -f, --file=value   Set configuration file. (Default:
@@ -105,6 +105,8 @@ Usage: go-sendxmpp [-cdilnt] [-f value] [--help] [--http-upload value] [-j value
      --ox-genprivkey
                     Generate a public OpenPGP key for the given JID and publish
                     the corresponding public key.
+     --ox-import-privkey=value
+                    Import an existing private OpenPGP key.
      --ox-passphrase=value
                     Passphrase for locking and unlocking the private OpenPGP
                     key.

main.go

@@ -111,6 +111,8 @@ func main() {
 		"Generate a public OpenPGP key for the given JID and publish the corresponding public key.")
 	flagOxPassphrase := getopt.StringLong("ox-passphrase", 0, "",
 		"Passphrase for locking and unlocking the private OpenPGP key.")
+	flagOxImportPrivKey := getopt.StringLong("ox-import-privkey", 0, "",
+		"Import an existing private OpenPGP key.")
 
 	// Parse command line flags.
 	getopt.Parse()
@@ -145,8 +147,8 @@ func main() {
 	// For listening or sending raw XML it's not required to specify a recipient except
 	// when sending raw messages to MUCs (go-sendxmpp will join the MUC automatically).
 	recipientsList := getopt.Args()
-	if (len(recipientsList) == 0 && !*flagRaw && !*flagListen && !*flagOxGenPrivKey) ||
-		(len(recipientsList) == 0 && *flagChatroom) {
+	if (len(recipientsList) == 0 && !*flagRaw && !*flagListen && !*flagOxGenPrivKey &&
+		*flagOxImportPrivKey == "") || (len(recipientsList) == 0 && *flagChatroom) {
 		log.Fatal("No recipient specified.")
 	}
 
@@ -287,6 +289,19 @@ func main() {
 		os.Exit(0)
 	}
 
+	if *flagOxImportPrivKey != "" {
+		validatedOwnJid, err := MarshalJID(user)
+		if err != nil {
+			log.Fatal(err)
+		}
+		err = oxImportPrivKey(validatedOwnJid, *flagOxImportPrivKey,
+			client)
+		if err != nil {
+			log.Fatal(err)
+		}
+		os.Exit(0)
+	}
+
 	if *flagOx {
 		validatedOwnJid, err := MarshalJID(user)
 		if err != nil {

man/go-sendxmpp.1

@@ -38,7 +38,11 @@ You can either pipe a programs output to \fBgo\-sendxmpp\fR, write in your termi
 .br
 There is also no check whether the recipients key is trusted as there is no local keyring used\. Go\-sendxmpp just uses the most recent key that is provided via pubsub and checks that it is not expired\.
 .P
-\fB\-\-ox\-genprivkey\fR: Generate a public OpenPGP key for the given JID and publish the corresponding public key\. Go\-sendxmpp will save the key in \fB$XDG_DATA_HOME/go\-sendxmpp/oxprivkeys\fR or \fB$HOME/\.local/share/go\-sendxmpp/oxprivkeys\fR\. To protect the key you might want to set a passphrase using \fB\-\-ox\-passphrase\fR while generating the key\.
+\fB\-\-ox\-genprivkey\fR: Generate a public OpenPGP key for the given JID and publish the corresponding public key\. Go\-sendxmpp will save the key in \fB$XDG_DATA_HOME/go\-sendxmpp/oxprivkeys\fR or \fB$HOME/\.local/share/go\-sendxmpp/oxprivkeys\fR\. To protect the key a passphrase might be set using \fB\-\-ox\-passphrase\fR while generating the key\.
+.br
+If there is an existing private key for "OpenPGP for XMPP" created by another client (e\.g\. profanity) it might be imported using \fB\-\-ox\-import\-privkey\fR\.
+.P
+\fB\-\-ox\-import\-privkey\fR=[\fIvalue\fR]: Import an existing private OpenPGP key\.
 .P
 \fB\-\-ox\-passphrase\fR=[\fIvalue\fR]: Passphrase for locking and unlocking the private OpenPGP key\.
 .P

man/go-sendxmpp.1.html

@@ -137,8 +137,13 @@ file location is specified with <code>-f</code> or <code>--file</code>.</p>
 <p><code>--ox-genprivkey</code>:
   Generate a public OpenPGP key for the given JID and publish the corresponding public key.
   Go-sendxmpp will save the key in <code>$XDG_DATA_HOME/go-sendxmpp/oxprivkeys</code> or 
-  <code>$HOME/.local/share/go-sendxmpp/oxprivkeys</code>. To protect the key you might want to set a 
-  passphrase using <code>--ox-passphrase</code> while generating the key.</p>
+  <code>$HOME/.local/share/go-sendxmpp/oxprivkeys</code>. To protect the key a passphrase might be set
+  using <code>--ox-passphrase</code> while generating the key.   <br>
+  If there is an existing private key for "OpenPGP for XMPP" created by another client (e.g. profanity)
+  it might be imported using <code>--ox-import-privkey</code>.</p>
+
+<p><code>--ox-import-privkey</code>=[<var>value</var>]:
+  Import an existing private OpenPGP key.</p>
 
 <p><code>--ox-passphrase</code>=[<var>value</var>]:
   Passphrase for locking and unlocking the private OpenPGP key.</p>

man/go-sendxmpp.1.ronn

@@ -62,8 +62,13 @@ file location is specified with `-f` or `--file`.
   `--ox-genprivkey`:
   Generate a public OpenPGP key for the given JID and publish the corresponding public key.
   Go-sendxmpp will save the key in `$XDG_DATA_HOME/go-sendxmpp/oxprivkeys` or 
-  `$HOME/.local/share/go-sendxmpp/oxprivkeys`. To protect the key you might want to set a 
-  passphrase using `--ox-passphrase` while generating the key.
+  `$HOME/.local/share/go-sendxmpp/oxprivkeys`. To protect the key a passphrase might be set
+  using `--ox-passphrase` while generating the key.     
+  If there is an existing private key for "OpenPGP for XMPP" created by another client (e.g. profanity)
+  it might be imported using `--ox-import-privkey`.
+
+  `--ox-import-privkey`=[<value>]:
+  Import an existing private OpenPGP key.
 
   `--ox-passphrase`=[<value>]:
   Passphrase for locking and unlocking the private OpenPGP key.

ox.go

@@ -19,6 +19,52 @@ import (
 	"github.com/mattn/go-xmpp"                 // BSD-3-Clause
 )
 
+func oxImportPrivKey(jid string, privKeyLocation string, client *xmpp.Client) error {
+	xmppUri := "xmpp:" + jid
+	buffer, err := readFile(privKeyLocation)
+	if err != nil {
+		return err
+	}
+	key, err := crypto.NewKey(buffer.Bytes())
+	if err != nil {
+		key, err = crypto.NewKeyFromArmored(buffer.String())
+		if err != nil {
+			return err
+		}
+	}
+	entity := key.GetEntity()
+	if entity.Identities[xmppUri] == nil {
+		return errors.New("Key identity is not " + xmppUri)
+	}
+	pk, err := key.GetPublicKey()
+	if err != nil {
+		return err
+	}
+	pubKey, err := crypto.NewKey(pk)
+	if err != nil {
+		return err
+	}
+	fingerprint := strings.ToUpper(pubKey.GetFingerprint())
+	_, err = oxRecvPublicKey(client, jid, fingerprint)
+	if err != nil {
+		return errors.New("Key not found in pubsub: " + fingerprint)
+	}
+	location, err := oxGetPrivKeyLoc(jid)
+	if err != nil {
+		return err
+	}
+	keySerialized, err := key.Serialize()
+	if err != nil {
+		return err
+	}
+	err = oxStorePrivKey(location,
+		base64.StdEncoding.EncodeToString(keySerialized))
+	if err != nil {
+		log.Fatal(err)
+	}
+	return nil
+}
+
 func oxGetPrivKeyLoc(jid string) (string, error) {
 	var err error
 	var homeDir, dataDir string
@@ -89,19 +135,15 @@ func oxGetPrivKey(jid string, passphrase string) (*crypto.Key, error) {
 	return key, nil
 }
 
-func oxStorePrivKey(jid string, privKey string) error {
-	dataFile, err := oxGetPrivKeyLoc(jid)
-	if err != nil {
-		log.Fatal(err)
-	}
+func oxStorePrivKey(location string, privKey string) error {
 	var file *os.File
-	if _, err := os.Stat(dataFile); os.IsNotExist(err) {
-		file, err = os.Create(dataFile)
+	if _, err := os.Stat(location); os.IsNotExist(err) {
+		file, err = os.Create(location)
 		if err != nil {
 			return err
 		}
 	} else {
-		file, err = os.OpenFile(dataFile, os.O_RDWR, 0600)
+		file, err = os.OpenFile(location, os.O_RDWR, 0600)
 		if err != nil {
 			return err
 		}
@@ -112,7 +154,7 @@ func oxStorePrivKey(jid string, privKey string) error {
 	} else {
 		_ = file.Chmod(os.FileMode(0200))
 	}
-	_, err = file.Write([]byte(privKey))
+	_, err := file.Write([]byte(privKey))
 	if err != nil {
 		return err
 	}
@@ -141,7 +183,11 @@ func oxGenPrivKey(jid string, client *xmpp.Client, passphrase string) error {
 	if err != nil {
 		return err
 	}
-	err = oxStorePrivKey(jid,
+	location, err := oxGetPrivKeyLoc(jid)
+	if err != nil {
+		return err
+	}
+	err = oxStorePrivKey(location,
 		base64.StdEncoding.EncodeToString(keySerialized))
 	if err != nil {
 		log.Fatal(err)