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cmd_decrypt.go
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cmd_decrypt.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package client
import (
"golang.org/x/net/context"
"fmt"
humanize "github.com/dustin/go-humanize"
"github.com/keybase/cli"
"github.com/keybase/client/go/libcmdline"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
"github.com/keybase/go-framed-msgpack-rpc/rpc"
)
type CmdDecrypt struct {
libkb.Contextified
filter UnixFilter
spui *SaltpackUI
opts keybase1.SaltpackDecryptOptions
senderfile *FileSink
}
func NewCmdDecrypt(cl *libcmdline.CommandLine, g *libkb.GlobalContext) cli.Command {
flags := []cli.Flag{
cli.StringFlag{
Name: "i, infile",
Usage: "Specify an input file.",
},
cli.StringFlag{
Name: "m, message",
Usage: "Provide the message on the command line.",
},
cli.StringFlag{
Name: "o, outfile",
Usage: "Specify an outfile (stdout by default).",
},
cli.BoolFlag{
Name: "interactive",
Usage: "Interactive prompt for decryption after sender verification",
},
cli.BoolFlag{
Name: "f, force",
Usage: "Force unprompted decryption, even on an identify failure",
},
cli.BoolFlag{
Name: "paperkey",
Usage: "Use a paper key for decryption",
},
cli.StringFlag{
Name: "encryptor-outfile",
Usage: "Write the Keybase name of the encryptor to this file",
},
}
return cli.Command{
Name: "decrypt",
Usage: "Decrypt messages or files for keybase users",
Action: func(c *cli.Context) {
cl.ChooseCommand(&CmdDecrypt{
Contextified: libkb.NewContextified(g),
opts: keybase1.SaltpackDecryptOptions{ForceRemoteCheck: true},
}, "decrypt", c)
},
Flags: flags,
}
}
func (c *CmdDecrypt) explainDecryptionFailure(info *keybase1.SaltpackEncryptedMessageInfo) {
if info == nil {
return
}
out := c.G().UI.GetTerminalUI().ErrorWriter()
prnt := func(s string, args ...interface{}) {
fmt.Fprintf(out, s, args...)
}
if len(info.Devices) > 0 {
prnt("Decryption failed; try one of these devices instead:\n")
for _, d := range info.Devices {
t := keybase1.FromTime(d.CTime)
prnt(" * %s (%s); provisioned %s (%s)\n", ColorString(c.G(), "bold", d.Name), d.Type,
humanize.Time(t), t.Format("2006-01-02 15:04:05 MST"))
}
if info.NumAnonReceivers > 0 {
prnt("Additionally, there were %d hidden receivers for this message\n", info.NumAnonReceivers)
}
} else if info.NumAnonReceivers > 0 {
prnt("Decryption failed; it was encrypted for %d hidden receivers, which may or may not be you\n", info.NumAnonReceivers)
} else {
prnt("Decryption failed; message wasn't encrypted for any of your known keys\n")
}
}
func (c *CmdDecrypt) Run() error {
cli, err := GetSaltpackClient(c.G())
if err != nil {
return err
}
// Can't do this in ParseArgv, need to wait until later
// in the initialization
c.spui.terminal = c.G().UI.GetTerminalUI()
protocols := []rpc.Protocol{
NewStreamUIProtocol(c.G()),
NewSecretUIProtocol(c.G()),
NewIdentifyUIProtocol(c.G()),
keybase1.SaltpackUiProtocol(c.spui),
}
if err := RegisterProtocolsWithContext(protocols, c.G()); err != nil {
return err
}
snk, src, err := c.filter.ClientFilterOpen(c.G())
if err != nil {
return err
}
var info keybase1.SaltpackEncryptedMessageInfo
arg := keybase1.SaltpackDecryptArg{
Source: src,
Sink: snk,
Opts: c.opts,
}
info, err = cli.SaltpackDecrypt(context.TODO(), arg)
if _, ok := err.(libkb.NoDecryptionKeyError); ok {
c.explainDecryptionFailure(&info)
} else if c.senderfile != nil {
if info.Sender.Username != "" {
if _, err := c.senderfile.Write([]byte(info.Sender.Username)); err != nil {
c.G().Log.Errorf("failure writing sender file: %s", err)
}
}
c.senderfile.Close()
}
cerr := c.filter.Close(err)
return libkb.PickFirstError(err, cerr)
}
func (c *CmdDecrypt) GetUsage() libkb.Usage {
return libkb.Usage{
API: true,
Config: true,
KbKeyring: true,
}
}
func (c *CmdDecrypt) ParseArgv(ctx *cli.Context) error {
if len(ctx.Args()) > 0 {
return UnexpectedArgsError("decrypt")
}
interactive := ctx.Bool("interactive")
c.spui = &SaltpackUI{
Contextified: libkb.NewContextified(c.G()),
interactive: interactive,
force: ctx.Bool("force"),
}
c.opts.Interactive = interactive
c.opts.UsePaperKey = ctx.Bool("paperkey")
msg := ctx.String("message")
outfile := ctx.String("outfile")
infile := ctx.String("infile")
senderfile := ctx.String("encryptor-outfile")
if err := c.filter.FilterInit(c.G(), msg, infile, outfile); err != nil {
return err
}
if senderfile != "" {
c.senderfile = NewFileSink(c.G(), senderfile)
}
return nil
}