commit 606f46027d07ab1469c23a52e13ef27bc9c0832a Author: Seán C McCord Date: Tue Jul 8 15:04:05 2025 -0400 first commit diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..966a5d4 --- /dev/null +++ b/README.md @@ -0,0 +1,3 @@ +# pass-totp + +A TOTP plugin for integration with pass, the password manager. diff --git a/default.nix b/default.nix new file mode 100644 index 0000000..a6be51c --- /dev/null +++ b/default.nix @@ -0,0 +1,23 @@ +{ buildGoModule, fetchFromGitHub, lib }: +let + pname = "pass-totp"; +in +buildGoModule { + inherit pname; + version = "2025-07-08"; + + src = fetchGit { + url = "https://git.cycore.io/scm/pass-totp.git"; + ref = "master"; + sha256 = "sha256-XgHxRChcyeoUibIFAleROUCPskHDzZSD1Kl7FUMVt7U="; + }; + + vendorSha256 = "sha256-rixop68iSE+OHjtMyLBbnphnjFBEtItqgheq2MyEfnc="; + + meta = with lib; { + description = "totp plugin for pass"; + homepage = "https://git.cycore.io/scm/pass-totp.git"; + license = licenses.gpl3Only; + platforms = platforms.linux; + }; +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..4242f7f --- /dev/null +++ b/flake.nix @@ -0,0 +1,64 @@ +{ + description = "totp plugin for pass"; + + # Nixpkgs / NixOS version to use. + inputs.nixpkgs.url = "nixpkgs/nixos-25.05"; + + outputs = { self, nixpkgs }: + let + + # to work with older version of flakes + lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101"; + + # Generate a user-friendly version number. + version = builtins.substring 0 8 lastModifiedDate; + + # System types to support. + supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ]; + + # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'. + forAllSystems = nixpkgs.lib.genAttrs supportedSystems; + + # Nixpkgs instantiated for supported system types. + nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; }); + + in + { + + # Provide some binary packages for selected system types. + packages = forAllSystems (system: + let + pkgs = nixpkgsFor.${system}; + in + { + default = pkgs.buildGoModule { + pname = "pass-totp"; + inherit version; + # In 'nix develop', we don't need a copy of the source tree + # in the Nix store. + src = ./.; + + # This hash locks the dependencies of this package. It is + # necessary because of how Go requires network access to resolve + # VCS. See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for + # details. Normally one can build with a fake sha256 and rely on native Go + # mechanisms to tell you what the hash should be or determine what + # it should be "out-of-band" with other tooling (eg. gomod2nix). + # To begin with it is recommended to set this, but one must + # remeber to bump this hash when your dependencies change. + #vendorSha256 = pkgs.lib.fakeSha256; + + vendorHash = "sha256-rixop68iSE+OHjtMyLBbnphnjFBEtItqgheq2MyEfnc="; + }; + }); + + # The default package for 'nix build'. This makes sense if the + # flake provides only one package or there is a clear "main" + # package. + #defaultPackage = forAllSystems (system: self.packages.${system}.pass-totp); + + overlays.default = (final: prev: { + pass-totp = self.packages.${prev.system}.default; + }); + }; +} diff --git a/generate.sh b/generate.sh new file mode 100755 index 0000000..3858a32 --- /dev/null +++ b/generate.sh @@ -0,0 +1,3 @@ +#!/usr/bin/env bash + +pass "$1/totp" | pass-totp diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..eac9a92 --- /dev/null +++ b/go.mod @@ -0,0 +1,3 @@ +module git.cycore.io/scm/pass-totp + +go 1.24.3 diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..e69de29 diff --git a/internal/otp/const.go b/internal/otp/const.go new file mode 100644 index 0000000..bb4f866 --- /dev/null +++ b/internal/otp/const.go @@ -0,0 +1,15 @@ +package otp + +// Default settings for all generators +const ( + DefaultLength = 6 // Default length of the generated tokens + DefaultPeriod = 30 // Default time period for TOTP tokens, in seconds + DefaultRandomSecretLength = 100 // Default random secret length + DefaultWindowBack = 1 // Default TOTP verification window back steps + DefaultWindowForward = 1 // Default TOTP verification window forward steps +) + +// Maximum values for all generators +const ( + MaxLength = 10 // Maximum token length +) diff --git a/internal/otp/doc.go b/internal/otp/doc.go new file mode 100644 index 0000000..acb66ae --- /dev/null +++ b/internal/otp/doc.go @@ -0,0 +1,2 @@ +// Package otp: original code from the now-removed github.com/hgfischer/go-otp repository +package otp diff --git a/internal/otp/hotp.go b/internal/otp/hotp.go new file mode 100644 index 0000000..10cbc8a --- /dev/null +++ b/internal/otp/hotp.go @@ -0,0 +1,58 @@ +package otp + +import ( + "encoding/base32" + "fmt" + "math" +) + +// HOTP is used to generate tokens based on RFC-4226. +// +// Example: +// +// hotp := &HOTP{Secret: "your-secret", Counter: 1000, Length: 8, IsBase32Secret: true} +// token := hotp.Get() +// +// HOTP assumes a set of default values for Secret, Length, Counter, and IsBase32Secret. +// If no Secret is informed, HOTP will generate a random one that you need to store with +// the Counter, for future token verifications. Check this package constants to see the +// current default values. +type HOTP struct { + Secret string // The secret used to generate the token + Length uint8 // The token size, with a maximum determined by MaxLength + Counter uint64 // The counter used as moving factor + IsBase32Secret bool // If true, the secret will be used as a Base32 encoded string +} + +func (h *HOTP) setDefaults() { + if len(h.Secret) == 0 { + h.Secret = generateRandomSecret(DefaultRandomSecretLength, h.IsBase32Secret) + } + if h.Length == 0 { + h.Length = DefaultLength + } +} + +func (h *HOTP) normalize() { + if h.Length > MaxLength { + h.Length = MaxLength + } +} + +// Get a token generated with the current HOTP settings +func (h *HOTP) Get() string { + h.setDefaults() + h.normalize() + text := counterToBytes(h.Counter) + var hash []byte + if h.IsBase32Secret { + secretBytes, _ := base32.StdEncoding.DecodeString(h.Secret) + hash = hmacSHA1(secretBytes, text) + } else { + hash = hmacSHA1([]byte(h.Secret), text) + } + binary := truncate(hash) + otp := int64(binary) % int64(math.Pow10(int(h.Length))) + hotp := fmt.Sprintf(fmt.Sprintf("%%0%dd", h.Length), otp) + return hotp +} diff --git a/internal/otp/misc.go b/internal/otp/misc.go new file mode 100644 index 0000000..dd7ca73 --- /dev/null +++ b/internal/otp/misc.go @@ -0,0 +1,44 @@ +package otp + +import ( + "crypto/hmac" + "crypto/rand" + "crypto/sha1" + "encoding/base32" +) + +func generateRandomSecret(size int, encodeToBase32 bool) string { + alphanum := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" + var bytes = make([]byte, size) + rand.Read(bytes) + for i, b := range bytes { + bytes[i] = alphanum[b%byte(len(alphanum))] + } + if encodeToBase32 { + return base32.StdEncoding.EncodeToString(bytes) + } + return string(bytes) +} + +func counterToBytes(counter uint64) (text []byte) { + text = make([]byte, 8) + for i := 7; i >= 0; i-- { + text[i] = byte(counter & 0xff) + counter = counter >> 8 + } + return +} + +func hmacSHA1(key, text []byte) []byte { + H := hmac.New(sha1.New, key) + H.Write([]byte(text)) + return H.Sum(nil) +} + +func truncate(hash []byte) int { + offset := int(hash[len(hash)-1] & 0xf) + return ((int(hash[offset]) & 0x7f) << 24) | + ((int(hash[offset+1] & 0xff)) << 16) | + ((int(hash[offset+2] & 0xff)) << 8) | + (int(hash[offset+3]) & 0xff) +} diff --git a/internal/otp/totp.go b/internal/otp/totp.go new file mode 100644 index 0000000..b4dab2a --- /dev/null +++ b/internal/otp/totp.go @@ -0,0 +1,83 @@ +// Package otp: original code from the now-removed github.com/hgfischer/go-otp repository +package otp + +import "time" + +// TOTP is used to generate tokens based on RFC-6238. +// +// Example: +// +// totp := &TOTP{Secret: "your-secret", IsBase32Secret: true} +// token := totp.Get() +// +// TOTP assumes a set of default values for Secret, Length, Time, Period, WindowBack, WindowForward and IsBase32Secret +// +// If no Secret is informed, TOTP will generate a random one that you need to store with the Counter, for future token +// verifications. +// +// Check this package constants to see the current default values. +type TOTP struct { + Secret string // The secret used to generate a token + Length uint8 // The token length + Time time.Time // The time used to generate the token + IsBase32Secret bool // + Period uint8 // The step size to slice time, in seconds + WindowBack uint8 // How many steps HOTP will go backwards to validate a token + WindowForward uint8 // How many steps HOTP will go forward to validate a token +} + +func (t *TOTP) setDefaults() { + if len(t.Secret) == 0 { + t.Secret = generateRandomSecret(DefaultRandomSecretLength, t.IsBase32Secret) + } + if t.Length == 0 { + t.Length = DefaultLength + } + if t.Time.IsZero() { + t.Time = time.Now() + } + if t.Period == 0 { + t.Period = DefaultPeriod + } + if t.WindowBack == 0 { + t.WindowBack = DefaultWindowBack + } + if t.WindowForward == 0 { + t.WindowForward = DefaultWindowForward + } +} + +func (t *TOTP) normalize() { + if t.Length > MaxLength { + t.Length = MaxLength + } +} + +// Get a time-based token +func (t *TOTP) Get() string { + t.setDefaults() + t.normalize() + ts := uint64(t.Time.Unix() / int64(t.Period)) + hotp := &HOTP{Secret: t.Secret, Counter: ts, Length: t.Length, IsBase32Secret: t.IsBase32Secret} + return hotp.Get() +} + +// Now is a fluent interface to set the TOTP generator's time to the current date/time +func (t *TOTP) Now() *TOTP { + t.Time = time.Now() + return t +} + +// Verify a token with the current settings, including the WindowBack and WindowForward +func (t TOTP) Verify(token string) bool { + t.setDefaults() + t.normalize() + givenTime := t.Time + for i := int(t.WindowBack) * -1; i <= int(t.WindowForward); i++ { + t.Time = givenTime.Add(time.Second * time.Duration(int(t.Period)*i)) + if t.Get() == token { + return true + } + } + return false +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..bfde66e --- /dev/null +++ b/main.go @@ -0,0 +1,39 @@ +package main + +import ( + "encoding/json" + "fmt" + "log" + "os" + "strings" + "time" + + "git.cycore.io/scm/pass-totp/internal/otp" +) + +type Token struct { + Token string `json:"token"` + TTLSeconds uint64 `json:"ttl_seconds"` +} + +func main() { + var key string + + fmt.Scan(&key) + + key = strings.ToUpper(key) + + totp := &otp.TOTP{ + Secret: key, + IsBase32Secret: true, + } + + token := totp.Get() + + if err := json.NewEncoder(os.Stdout).Encode(&Token{ + Token: token, + TTLSeconds: uint64(30 - time.Now().Unix()%30), + }); err != nil { + log.Println("failed to encode token to json:", err) + } +}