The `getpass` module provides a simple way to retrieve a password from the user by specifying a number of different password sources: func Getpass(passfrom string) (pass string, err error) Getpass retrieves a password from the user using a method defined by the `passfrom` string. The following methods are supported: `cmd:command` -- Obtain the password by running the given command. The command will be passed to the shell for execution via `/bin/sh -c 'command'`. `env:var` -- Obtain the password from the environment variable var. Since the environment of other processes may be visible via e.g. `ps(1)`, this option should be used with caution. `file:pathname` -- The first line of `pathname` is the password. `pathname` need not refer to a regular file: it could for example refer to a device or named pipe. `pathname` undergoes standard "~" and environment variable expansion. Note that standard Unix file access controls should be used to protect this file. `keychain:name` -- Use the `security(1)` utility to retrieve the password from the macOS keychain. `lpass:name` -- Use the LastPass command-line client `lpass(1)` to retrieve the named password. You should previously have run `lpass login` for this to work. `op:name` -- Use the 1Password command-line client `op(1)` to retrieve the named password. `pass:password` -- The actual password is password. Since the password is visible to utilities such as `ps(1)` and possibly leaked into the shell history file, this form should only be used where security is not important. `tty[:prompt]` -- This is the default: `Getpass` will prompt the user on the controlling tty using the provided `prompt`. If no `prompt` is provided, then `Getpass` will use "Password: ". ## Examples ``` package main import ( "flag" "fmt" "log" "github.com/jschauma/getpass" ) func main() { var pass string flag.StringVar(&pass, "p", "tty", "password method") flag.Parse() // Try out any of the options: p, err := getpass.Getpass(pass) if err != nil { log.Fatal("Unable to get password from user: ", err) } else { fmt.Printf("%s\n", p) } // Alternatively: // This will prompt the user to enter a password interactively, // using the default prompt. p, err = getpass.Getpass() if err != nil { log.Fatal("Unable to get password from user: ", err) } else { fmt.Printf("%s\n", p) } // Using a custom prompt: p, err = getpass.Getpass("tty:Please enter your secret passphrase: ") if err != nil { log.Fatal("Unable to get password from user: ", err) } else { fmt.Printf("%s\n", p) } // Using an environment variable: p, err = getpass.Getpass("env:MYSECRET") if err != nil { log.Fatal("Unable to get password from user: ", err) } else { fmt.Printf("%s\n", p) } // Using a file: p, err = getpass.Getpass("file:~/.secret") if err != nil { log.Fatal("Unable to get password from user: ", err) } else { fmt.Printf("%s\n", p) } // etc. etc. } ``` --- See also: * https://www.netmeister.org/blog/passing-passwords.html * https://www.netmeister.org/blog/consistent-tools.html#passwords
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