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4cff36d731
The docs at os/signal.Notify warn about this signal delivery loss bug at https://golang.org/pkg/os/signal/#Notify, which says: Package signal will not block sending to c: the caller must ensure that c has sufficient buffer space to keep up with the expected signal rate. For a channel used for notification of just one signal value, a buffer of size 1 is sufficient. Caught by a static analysis tool from Orijtech, Inc. called "sigchanyzer"
134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyauth
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import (
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"bufio"
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"bytes"
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"encoding/base64"
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"flag"
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"fmt"
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"os"
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"os/signal"
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"github.com/caddyserver/caddy/v2"
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caddycmd "github.com/caddyserver/caddy/v2/cmd"
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"golang.org/x/crypto/ssh/terminal"
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)
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func init() {
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caddycmd.RegisterCommand(caddycmd.Command{
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Name: "hash-password",
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Func: cmdHashPassword,
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Usage: "[--algorithm <name>] [--salt <string>] [--plaintext <password>]",
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Short: "Hashes a password and writes base64",
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Long: `
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Convenient way to hash a plaintext password. The resulting
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hash is written to stdout as a base64 string.
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--plaintext, when omitted, will be read from stdin. If
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Caddy is attached to a controlling tty, the plaintext will
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not be echoed.
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--algorithm may be bcrypt or scrypt. If script, the default
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parameters are used.
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Use the --salt flag for algorithms which require a salt to
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be provided (scrypt).
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`,
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Flags: func() *flag.FlagSet {
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fs := flag.NewFlagSet("hash-password", flag.ExitOnError)
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fs.String("algorithm", "bcrypt", "Name of the hash algorithm")
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fs.String("plaintext", "", "The plaintext password")
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fs.String("salt", "", "The password salt")
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return fs
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}(),
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})
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}
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func cmdHashPassword(fs caddycmd.Flags) (int, error) {
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var err error
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algorithm := fs.String("algorithm")
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plaintext := []byte(fs.String("plaintext"))
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salt := []byte(fs.String("salt"))
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if len(plaintext) == 0 {
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fd := int(os.Stdin.Fd())
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if terminal.IsTerminal(fd) {
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// ensure the terminal state is restored on SIGINT
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state, _ := terminal.GetState(fd)
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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go func() {
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<-c
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_ = terminal.Restore(fd, state)
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os.Exit(caddy.ExitCodeFailedStartup)
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}()
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defer signal.Stop(c)
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fmt.Fprint(os.Stderr, "Enter password: ")
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plaintext, err = terminal.ReadPassword(fd)
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fmt.Fprintln(os.Stderr)
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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fmt.Fprint(os.Stderr, "Confirm password: ")
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confirmation, err := terminal.ReadPassword(fd)
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fmt.Fprintln(os.Stderr)
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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if !bytes.Equal(plaintext, confirmation) {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("password does not match")
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}
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} else {
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rd := bufio.NewReader(os.Stdin)
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plaintext, err = rd.ReadBytes('\n')
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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plaintext = plaintext[:len(plaintext)-1] // Trailing newline
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}
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if len(plaintext) == 0 {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("plaintext is required")
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}
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}
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var hash []byte
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switch algorithm {
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case "bcrypt":
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hash, err = BcryptHash{}.Hash(plaintext, nil)
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case "scrypt":
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def := ScryptHash{}
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def.SetDefaults()
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hash, err = def.Hash(plaintext, salt)
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default:
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return caddy.ExitCodeFailedStartup, fmt.Errorf("unrecognized hash algorithm: %s", algorithm)
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}
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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hashBase64 := base64.StdEncoding.EncodeToString(hash)
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fmt.Println(hashBase64)
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return 0, nil
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}
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