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Add option to generate OTP codes automatically

Browse source 
* This uses the great libcotp library, I stripped it down to fit inside
the repository.
* This is a security-convenience trade-off, and it's made very clear
with the tooltips on the settings page.
* It's still secured by your system keychain, and it's up to the users
whether that's good enough for them. Eventually down the line
I would like to support more esoteric keychains such as Bitwarden or
KeePass.
* Right now it's only integrated into the auto-login desktop feature,
but there will eventually be like an "auto-fill OTP" button in the main
window.

There's still a lot to clean up with these new features but they work
a little at least :-)
This commit is contained in:
Joshua Goins 2022-08-31 21:19:25 -04:00
parent 540c8b6f80
commit 5ee036dd09
21 changed files with 1596 additions and 7 deletions
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add_subdirectory(libbaseencode)
add_subdirectory(libcotp)
include(FetchContent)
FetchContent_Declare(

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.idea/
cmake-build-debug/
build/
# Object files
*.o
*.ko
*.obj
*.elf
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/
*.su

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cmake_minimum_required(VERSION 3.5)
project(baseencode)
include(GNUInstallDirs)
# set up versioning.
set(BUILD_MAJOR "1")
set(BUILD_MINOR "0")
set(BUILD_VERSION "14")
set(BUILD_VERSION ${BUILD_MAJOR}.${BUILD_MINOR}.${BUILD_VERSION})
set(CMAKE_C_STANDARD 11)
set(BASEENCODE_HEADERS src/baseencode.h)
set(SOURCE_FILES src/base32.c src/base64.c)
set(CMAKE_C_FLAGS "-Wall -Werror -fPIC")
add_library(${PROJECT_NAME} SHARED ${SOURCE_FILES})
target_link_libraries(${PROJECT_NAME} ${PROJECT_LIBS})
target_include_directories(${PROJECT_NAME} PUBLIC src)
set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${BUILD_VERSION} SOVERSION ${BUILD_MAJOR})

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Apache License
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http://www.apache.org/licenses/
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5. Submission of Contributions. Unless You explicitly state otherwise,
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6. Trademarks. This License does not grant permission to use the trade
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7. Disclaimer of Warranty. Unless required by applicable law or
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
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or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
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of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "{}"
replaced with your own identifying information. (Don't include
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Copyright 2018 Paolo Stivanin
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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# libbaseencode
<a href="https://scan.coverity.com/projects/paolostivanin-libbaseencode">
<img alt="Coverity Scan Build Status"
src="https://scan.coverity.com/projects/12747/badge.svg"/>
</a>
Library written in C for encoding and decoding data using base32 or base64 according to [RFC-4648](https://tools.ietf.org/html/rfc4648)
# Requiremens
- GCC or Clang
- CMake
# Build and Install
```
$ git clone https://github.com/paolostivanin/libbaseencode.git
$ cd libbaseencode
$ mkdir build && cd $_
$ cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr ../
$ make
# make install
```
# How To Use It
```
char *b32_encoded = base32_encode(unsigned char *input, size_t input_length, baseencode_error_t *err);
unsigned char *b32_decoded = base32_decode(char *input, size_t input_length, baseencode_error_t *err);
char *b64_encoded = base64_encode(unsigned char *input, size_t input_length, baseencode_error_t *err);
unsigned char *b64_decoded = base64_decode(char *input, size_t input_length, baseencode_error_t *err);
```
Please note that all the returned value **must be freed** once not needed any more.
## Errors
In case of errors, `NULL` is returned and `err` is set to either one of:
```
INVALID_INPUT, EMPTY_STRING, INPUT_TOO_BIG, INVALID_B32_DATA, INVALID_B64_DATA, MEMORY_ALLOCATION,
```
otherwise, `err` is set to `SUCCESS`

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# Security Policy
## Supported Versions
The following list describes whether a version is eligible or not for security updates.
| Version | Supported | EOL |
| ------- | ------------------ |-------------|
| 1.0.x | :heavy_check_mark: | - |
## Reporting a Vulnerability
Should you find a vulnerability, please report it privately to me via [e-mail](mailto:paolostivanin@users.noreply.github.com).
The following is the workflow:
- security issue is found, an e-mail is sent to me
- within 24 hours I will reply to your e-mail with some info like, for example, whether it actually is a security issue and how serious it is
- within 7 days I will develop and ship a fix
- once the update is out I will open a [security advisory](https://github.com/paolostivanin/OTPClient/security/advisories)

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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
static int is_valid_b32_input(const char *user_data, size_t data_len);
static int get_char_index(unsigned char c);
static const unsigned char b32_alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
// The encoding process represents 40-bit groups of input bits as output strings of 8 encoded characters. The input data must be null terminated.
char *
base32_encode(const unsigned char *user_data, size_t data_len, baseencode_error_t *err)
{
baseencode_error_t error;
check_input(user_data, data_len, MAX_ENCODE_INPUT_LEN, &error);
if (error != SUCCESS) {
*err = error;
if (error == EMPTY_STRING) {
return strdup("");
} else {
return NULL;
}
}
size_t user_data_chars = 0, total_bits = 0;
int num_of_equals = 0;
for (int i = 0; i < data_len; i++) {
// As it's not known whether data_len is with or without the +1 for the null byte, a manual check is required.
// Check for null byte only at the end of the user given length, otherwise issue#23 may occur
if (user_data[i] == '\0' && i == data_len-1) {
break;
} else {
total_bits += 8;
user_data_chars += 1;
}
}
switch (total_bits % 40) {
case 8:
num_of_equals = 6;
break;
case 16:
num_of_equals = 4;
break;
case 24:
num_of_equals = 3;
break;
case 32:
num_of_equals = 1;
break;
default:
break;
}
size_t output_length = (user_data_chars * 8 + 4) / 5;
char *encoded_data = calloc(output_length + num_of_equals + 1, 1);
if (encoded_data == NULL) {
*err = MEMORY_ALLOCATION;
return NULL;
}
uint64_t first_octet, second_octet, third_octet, fourth_octet, fifth_octet;
uint64_t quintuple;
for (int i = 0, j = 0; i < user_data_chars;) {
first_octet = i < user_data_chars ? user_data[i++] : 0;
second_octet = i < user_data_chars ? user_data[i++] : 0;
third_octet = i < user_data_chars ? user_data[i++] : 0;
fourth_octet = i < user_data_chars ? user_data[i++] : 0;
fifth_octet = i < user_data_chars ? user_data[i++] : 0;
quintuple =
((first_octet >> 3) << 35) +
((((first_octet & 0x7) << 2) | (second_octet >> 6)) << 30) +
(((second_octet & 0x3F) >> 1) << 25) +
((((second_octet & 0x01) << 4) | (third_octet >> 4)) << 20) +
((((third_octet & 0xF) << 1) | (fourth_octet >> 7)) << 15) +
(((fourth_octet & 0x7F) >> 2) << 10) +
((((fourth_octet & 0x3) << 3) | (fifth_octet >> 5)) << 5) +
(fifth_octet & 0x1F);
encoded_data[j++] = b32_alphabet[(quintuple >> 35) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 30) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 25) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 20) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 15) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 10) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 5) & 0x1F];
encoded_data[j++] = b32_alphabet[(quintuple >> 0) & 0x1F];
}
for (int i = 0; i < num_of_equals; i++) {
encoded_data[output_length + i] = '=';
}
encoded_data[output_length + num_of_equals] = '\0';
*err = SUCCESS;
return encoded_data;
}
unsigned char *
base32_decode(const char *user_data_untrimmed, size_t data_len, baseencode_error_t *err)
{
baseencode_error_t error;
check_input((unsigned char *)user_data_untrimmed, data_len, MAX_DECODE_BASE32_INPUT_LEN, &error);
if (error != SUCCESS) {
*err = error;
if (error == EMPTY_STRING) {
return (unsigned char *) strdup("");
} else {
return NULL;
}
}
char *user_data = strdup(user_data_untrimmed);
data_len -= strip_char(user_data, ' ');
if (!is_valid_b32_input(user_data, data_len)) {
*err = INVALID_B32_DATA;
free(user_data);
return NULL;
}
size_t user_data_chars = 0;
for (int i = 0; i < data_len; i++) {
// As it's not known whether data_len is with or without the +1 for the null byte, a manual check is required.
if (user_data[i] != '=' && user_data[i] != '\0') {
user_data_chars += 1;
}
}
size_t output_length = (size_t) ((user_data_chars + 1.6 + 1) / 1.6); // round up
unsigned char *decoded_data = calloc(output_length + 1, 1);
if (decoded_data == NULL) {
*err = MEMORY_ALLOCATION;
free(user_data);
return NULL;
}
uint8_t mask = 0, current_byte = 0;
int bits_left = 8;
for (int i = 0, j = 0; i < user_data_chars; i++) {
int char_index = get_char_index((unsigned char)user_data[i]);
if (bits_left > BITS_PER_B32_BLOCK) {
mask = (uint8_t) char_index << (bits_left - BITS_PER_B32_BLOCK);
current_byte = (uint8_t) (current_byte | mask);
bits_left -= BITS_PER_B32_BLOCK;
} else {
mask = (uint8_t) char_index >> (BITS_PER_B32_BLOCK - bits_left);
current_byte = (uint8_t) (current_byte | mask);
decoded_data[j++] = current_byte;
current_byte = (uint8_t) (char_index << (BITS_PER_BYTE - BITS_PER_B32_BLOCK + bits_left));
bits_left += BITS_PER_BYTE - BITS_PER_B32_BLOCK;
}
}
decoded_data[output_length] = '\0';
free(user_data);
*err = SUCCESS;
return decoded_data;
}
static int
is_valid_b32_input(const char *user_data, size_t data_len)
{
size_t found = 0, b32_alphabet_len = sizeof(b32_alphabet);
for (int i = 0; i < data_len; i++) {
if (user_data[i] == '\0') {
found++;
break;
}
for(int j = 0; j < b32_alphabet_len; j++) {
if(user_data[i] == b32_alphabet[j] || user_data[i] == '=') {
found++;
break;
}
}
}
if (found != data_len) {
return 0;
} else {
return 1;
}
}
static int
get_char_index(unsigned char c)
{
for (int i = 0; i < sizeof(b32_alphabet); i++) {
if (b32_alphabet[i] == c) {
return i;
}
}
return -1;
}

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#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
static int is_valid_b64_input(const char *user_data, size_t data_len);
static int get_char_index(unsigned char c);
static const unsigned char b64_alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *
base64_encode(const unsigned char *user_data, size_t data_len, baseencode_error_t *err)
{
baseencode_error_t error;
check_input(user_data, data_len, MAX_ENCODE_INPUT_LEN, &error);
if (error != SUCCESS) {
*err = error;
if (error == EMPTY_STRING) {
return strdup("");
} else {
return NULL;
}
}
size_t user_data_chars = 0, total_bits = 0;
int num_of_equals = 0;
for (int i = 0; i < data_len; i++) {
// As it's not known whether data_len is with or without the +1 for the null byte, a manual check is required.
if (user_data[i] != '\0') {
total_bits += 8;
user_data_chars += 1;
} else {
break;
}
}
switch (total_bits % 24) {
case 8:
num_of_equals = 2;
break;
case 16:
num_of_equals = 1;
break;
default:
break;
}
size_t output_length = (user_data_chars * 8 + 4) / 6;
char *encoded_data = calloc(output_length + num_of_equals + 1 + 3, 1);
if (encoded_data == NULL) {
*err = MEMORY_ALLOCATION;
return NULL;
}
uint8_t first_octet, second_octet, third_octet;
for (int i = 0, j = 0, triple = 0; i < user_data_chars + 1;) {
first_octet = (uint8_t) (i < user_data_chars+1 ? user_data[i++] : 0);
second_octet = (uint8_t) (i < user_data_chars+1 ? user_data[i++] : 0);
third_octet = (uint8_t) (i < user_data_chars+1 ? user_data[i++] : 0);
triple = (first_octet << 0x10) + (second_octet << 0x08) + third_octet;
encoded_data[j++] = b64_alphabet[(triple >> 0x12) & 0x3F];
encoded_data[j++] = b64_alphabet[(triple >> 0x0C) & 0x3F];
encoded_data[j++] = b64_alphabet[(triple >> 0x06) & 0x3F];
encoded_data[j++] = b64_alphabet[(triple >> 0x00) & 0x3F];
}
for (int i = 0; i < num_of_equals; i++) {
encoded_data[output_length + i] = '=';
}
encoded_data[output_length + num_of_equals] = '\0';
*err = SUCCESS;
return encoded_data;
}
unsigned char *
base64_decode(const char *user_data_untrimmed, size_t data_len, baseencode_error_t *err)
{
baseencode_error_t error;
check_input((unsigned char *)user_data_untrimmed, data_len, MAX_DECODE_BASE64_INPUT_LEN, &error);
if (error != SUCCESS) {
*err = error;
if (error == EMPTY_STRING) {
return (unsigned char *) strdup("");
} else {
return NULL;
}
}
char *user_data = strdup(user_data_untrimmed);
data_len -= strip_char(user_data, ' ');
if (!is_valid_b64_input(user_data, data_len)) {
*err = INVALID_B64_DATA;
free(user_data);
return NULL;
}
size_t user_data_chars = 0;
for (int z = 0; z < data_len; z++) {
// As it's not known whether data_len is with or without the +1 for the null byte, a manual check is required.
if (user_data[z] != '=' && user_data[z] != '\0') {
user_data_chars += 1;
}
}
size_t output_length = data_len / 4 * 3;
unsigned char *decoded_data = calloc(output_length + 1, 1);
if (decoded_data == NULL) {
*err = MEMORY_ALLOCATION;
free(user_data);
return NULL;
}
uint8_t mask = 0, current_byte = 0;
int bits_left = 8;
for (int i = 0, j = 0; i < user_data_chars; i++) {
int char_index = get_char_index((unsigned char)user_data[i]);
if (bits_left > BITS_PER_B64_BLOCK) {
mask = (uint8_t) char_index << (bits_left - BITS_PER_B64_BLOCK);
current_byte = (uint8_t) (current_byte | mask);
bits_left -= BITS_PER_B64_BLOCK;
} else {
mask = (uint8_t) char_index >> (BITS_PER_B64_BLOCK - bits_left);
current_byte = (uint8_t) (current_byte | mask);
decoded_data[j++] = current_byte;
current_byte = (uint8_t) (char_index << (BITS_PER_BYTE - BITS_PER_B64_BLOCK + bits_left));
bits_left += BITS_PER_BYTE - BITS_PER_B64_BLOCK;
}
}
decoded_data[output_length] = '\0';
free(user_data);
*err = SUCCESS;
return decoded_data;
}
static int
is_valid_b64_input(const char *user_data, size_t data_len)
{
size_t found = 0, b64_alphabet_len = sizeof(b64_alphabet);
for (int i = 0; i < data_len; i++) {
for(int j = 0; j < b64_alphabet_len; j++) {
if(user_data[i] == b64_alphabet[j] || user_data[i] == '=') {
found++;
break;
}
}
}
if (found != data_len) {
return 0;
} else {
return 1;
}
}
static int
get_char_index(unsigned char c)
{
for (int i = 0; i < sizeof(b64_alphabet); i++) {
if (b64_alphabet[i] == c) {
return i;
}
}
return -1;
}

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#pragma once
typedef enum _baseencode_errno {
SUCCESS = 0,
INVALID_INPUT = 1,
EMPTY_STRING = 2,
INPUT_TOO_BIG = 3,
INVALID_B32_DATA = 4,
INVALID_B64_DATA = 5,
MEMORY_ALLOCATION = 6,
} baseencode_error_t;
char *base32_encode (const unsigned char *user_data,
size_t data_len,
baseencode_error_t *err);
unsigned char *base32_decode (const char *user_data,
size_t data_len,
baseencode_error_t *err);
char *base64_encode (const unsigned char *input_string,
size_t input_length,
baseencode_error_t *err);
unsigned char *base64_decode (const char *input_string,
size_t input_length,
baseencode_error_t *err);

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#pragma once
#include "baseencode.h"
#define BITS_PER_BYTE 8
#define BITS_PER_B32_BLOCK 5
#define BITS_PER_B64_BLOCK 6
// 64 MB should be more than enough
#define MAX_ENCODE_INPUT_LEN 64*1024*1024
// if 64 MB of data is encoded than it should be also possible to decode it. That's why a bigger input is allowed for decoding
#define MAX_DECODE_BASE32_INPUT_LEN ((MAX_ENCODE_INPUT_LEN * 8 + 4) / 5)
#define MAX_DECODE_BASE64_INPUT_LEN ((MAX_ENCODE_INPUT_LEN * 8 + 4) / 6)
static int
strip_char(char *str, char strip)
{
int found = 0;
char *p, *q;
for (q = p = str; *p; p++) {
if (*p != strip) {
*q++ = *p;
} else {
found++;
}
}
*q = '\0';
return found;
}
static void
check_input(const unsigned char *user_data, size_t data_len, int max_len, baseencode_error_t *err)
{
if (user_data == NULL || (data_len == 0 && user_data[0] != '\0')) {
*err = INVALID_INPUT;
return;
} else if (user_data[0] == '\0') {
*err = EMPTY_STRING;
return;
}
if (data_len > max_len) {
*err = INPUT_TOO_BIG;
return;
}
*err = SUCCESS;
}

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.idea/
cmake-build-debug/
build/
# Object files
*.o
*.ko
*.obj
*.elf
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/

34
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cmake_minimum_required(VERSION 3.5)
project(cotp)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
include(GNUInstallDirs)
find_package(PkgConfig REQUIRED)
find_package(Gcrypt 1.6.0 REQUIRED)
include_directories(${GCRYPT_INCLUDE_DIR})
link_directories(${GCRYPT_LIBRARY_DIRS})
# set up versioning.
set(BUILD_MAJOR "1")
set(BUILD_MINOR "2")
set(BUILD_VERSION "6")
set(BUILD_VERSION ${BUILD_MAJOR}.${BUILD_MINOR}.${BUILD_VERSION})
set(CMAKE_C_STANDARD 11)
set(COTP_HEADERS src/cotp.h)
set(SOURCE_FILES src/otp.c)
set(CMAKE_C_FLAGS "-Wall -Wextra -O3 -Wno-format-truncation -fstack-protector-strong -fPIC")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3")
add_library(cotp SHARED ${SOURCE_FILES})
target_link_libraries(cotp ${GCRYPT_LIBRARIES} baseencode)
target_include_directories(cotp PUBLIC src)
set_target_properties(cotp PROPERTIES VERSION ${BUILD_VERSION} SOVERSION ${BUILD_MAJOR}${BUILD_MINOR})

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Apache License
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http://www.apache.org/licenses/
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5. Submission of Contributions. Unless You explicitly state otherwise,
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6. Trademarks. This License does not grant permission to use the trade
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7. Disclaimer of Warranty. Unless required by applicable law or
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8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "{}"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright 2018 Paolo Stivanin
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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# libcotp
<a href="https://scan.coverity.com/projects/paolostivanin-libcotp">
<img alt="Coverity Scan Build Status"
src="https://scan.coverity.com/projects/12748/badge.svg"/>
</a>
C library that generates TOTP and HOTP according to [RFC-6238](https://tools.ietf.org/html/rfc6238)
## Requirements
- [libbaseencode](https://github.com/paolostivanin/libbaseencode)
- GCC/Clang and CMake to build the library
- libgcrypt
## Build and Install
```
$ git clone https://github.com/paolostivanin/libcotp.git
$ cd libcotp
$ mkdir build && cd $_
$ cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr ../ # add -DBUILD_TESTING=ON if you want to compile also the tests
$ make
# make install
```
## How To Use It
```
char *totp = get_totp (const char *base32_encoded_secret, int digits, int period, int algo, cotp_error_t *err);
free (totp);
char *steam_totp = get_steam_totp (const char *secret, int period, cotp_error_t *err)
char *hotp = get_hotp (const char *base32_encoded_secret, long counter, int digits, int algo, cotp_error_t *err);
free (hotp);
char *get_totp_at (const char *base32_encoded_secret, long target_date, int digits, int algo, cotp_error_t *err)
int is_valid = totp_verify (const har *base32_encoded_secret, const char *totp, int digits, int period, int algo, cotp_error_t *err);
int is_valid = hotp_verify (const char *base32_encoded_secret, long counter, digits, char *hotp, int algo, cotp_error_t *err);
```
where:
- `secret_key` is the **base32 encoded** secret. Usually, a website gives you the secret already base32 encoded, so you should pay attention to not encode the secret again.
The format of the secret can either be `hxdm vjec jjws` or `HXDMVJECJJWS`. In the first case, the library will normalize the secret to second format before computing the OTP.
- `digits` is between `3` and `10` inclusive
- `period` is between `1` and `120` inclusive
- `counter` is a value decided with the server
- `target_date` is the target date specified as the unix epoch format in seconds
- `algo` is either `SHA1`, `SHA256` or `SHA512`
## Errors
`get_totp`, `get_hotp` and `get_totp_at` return `NULL` if an error occurs and `err` is set accordingly. The following errors are currently supported:
- `GCRYPT_VERSION_MISMATCH`, set if the installed Gcrypt library is too old
- `INVALID_B32_INPUT`, set if the given input is not valid base32 text
- `INVALID_ALGO`, set if the given algo is not supported by the library
- `INVALID_PERIOD`, set if `period` is `<= 0` or `> 120` seconds
- `INVALID_DIGITS`, set if `digits` is `< 3` or `> 10`
`totp_verify` and `hotp_verify` can return, in addition to one of the previous code, also the error `INVALID_OTP` if the given OTP doesn't match the computed one.
In case of success, the value returned by `get_totp`, `get_hotp` and `get_totp_at` **must be freed** once no longer needed.

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# Security Policy
## Supported Versions
The following list describes whether a version is eligible or not for security updates.
| Version | Supported | EOL |
| ------- | ------------------ |-------------|
| 1.2.x | :heavy_check_mark: | - |
| 1.1.x | :x: | 31-Dec-2021 |
| 1.0.x | :x: | 31-Dec-2021 |
## Reporting a Vulnerability
Should you find a vulnerability, please report it privately to me via [e-mail](mailto:paolostivanin@users.noreply.github.com).
The following is the workflow:
- security issue is found, an e-mail is sent to me
- within 24 hours I will reply to your e-mail with some info like, for example, whether it actually is a security issue and how serious it is
- within 7 days I will develop and ship a fix
- once the update is out I will open a [security advisory](https://github.com/paolostivanin/OTPClient/security/advisories)

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# Copyright (C) 2011 Felix Geyer <debfx@fobos.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 or (at your option)
# version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
find_path(GCRYPT_INCLUDE_DIR gcrypt.h)
find_library(GCRYPT_LIBRARIES gcrypt)
mark_as_advanced(GCRYPT_LIBRARIES GCRYPT_INCLUDE_DIR)
if(GCRYPT_INCLUDE_DIR AND EXISTS "${GCRYPT_INCLUDE_DIR}/gcrypt.h")
file(STRINGS "${GCRYPT_INCLUDE_DIR}/gcrypt.h" GCRYPT_H REGEX "^#define GCRYPT_VERSION \"[^\"]*\"$")
string(REGEX REPLACE "^.*GCRYPT_VERSION \"([0-9]+).*$" "\\1" GCRYPT_VERSION_MAJOR "${GCRYPT_H}")
string(REGEX REPLACE "^.*GCRYPT_VERSION \"[0-9]+\\.([0-9]+).*$" "\\1" GCRYPT_VERSION_MINOR "${GCRYPT_H}")
string(REGEX REPLACE "^.*GCRYPT_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" GCRYPT_VERSION_PATCH "${GCRYPT_H}")
set(GCRYPT_VERSION_STRING "${GCRYPT_VERSION_MAJOR}.${GCRYPT_VERSION_MINOR}.${GCRYPT_VERSION_PATCH}")
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Gcrypt DEFAULT_MSG GCRYPT_LIBRARIES GCRYPT_INCLUDE_DIR)

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#pragma once
#include <gcrypt.h>
#define SHA1 GCRY_MD_SHA1
#define SHA256 GCRY_MD_SHA256
#define SHA512 GCRY_MD_SHA512
typedef enum _cotp_errno {
VALID = 0,
GCRYPT_VERSION_MISMATCH = 1,
INVALID_B32_INPUT = 2,
INVALID_ALGO = 3,
INVALID_OTP = 4,
INVALID_DIGITS = 5,
INVALID_PERIOD = 6
} cotp_error_t;
#ifdef __cplusplus
extern "C" {
#endif
char *get_hotp (const char *base32_encoded_secret,
long counter,
int digits,
int sha_algo,
cotp_error_t *err_code);
char *get_totp (const char *base32_encoded_secret,
int digits,
int period,
int sha_algo,
cotp_error_t *err_code);
char *get_steam_totp (const char *base32_encoded_secret,
int period,
cotp_error_t *err_code);
char *get_totp_at (const char *base32_encoded_secret,
long time,
int digits,
int period,
int sha_algo,
cotp_error_t *err_code);
char *get_steam_totp_at (const char *base32_encoded_secret,
long timestamp,
int period,
cotp_error_t *err_code);
int totp_verify (const char *base32_encoded_secret,
const char *user_totp,
int digits,
int period,
int sha_algo);
int hotp_verify (const char *base32_encoded_secret,
long counter,
int digits,
const char *user_hotp,
int sha_algo);
#ifdef __cplusplus
}
#endif

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#include <stdio.h>
#include <time.h>
#include <string.h>
#include <gcrypt.h>
#include <baseencode.h>
#include "cotp.h"
#define SHA1_DIGEST_SIZE 20
#define SHA256_DIGEST_SIZE 32
#define SHA512_DIGEST_SIZE 64
static long long int DIGITS_POWER[] = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 10000000000};
static int
check_gcrypt()
{
if (!gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P)) {
if (!gcry_check_version("1.6.0")) {
fprintf(stderr, "libgcrypt v1.6.0 and above is required\n");
return -1;
}
gcry_control(GCRYCTL_DISABLE_SECMEM, 0);
gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
}
return 0;
}
static char *
normalize_secret (const char *K)
{
char *nK = calloc (1, strlen (K) + 1);
if (nK == NULL) {
fprintf (stderr, "Error during memory allocation\n");
return nK;
}
int i = 0, j = 0;
while (K[i] != '\0') {
if (K[i] != ' ') {
if (K[i] >= 'a' && K[i] <= 'z') {
nK[j++] = (char) (K[i] - 32);
} else {
nK[j++] = K[i];
}
}
i++;
}
return nK;
}
static char *
get_steam_code(unsigned const char *hmac)
{
int offset = (hmac[SHA1_DIGEST_SIZE-1] & 0x0f);
// Starting from the offset, take the successive 4 bytes while stripping the topmost bit to prevent it being handled as a signed integer
int bin_code = ((hmac[offset] & 0x7f) << 24) | ((hmac[offset + 1] & 0xff) << 16) | ((hmac[offset + 2] & 0xff) << 8) | ((hmac[offset + 3] & 0xff));
const char steam_alphabet[] = "23456789BCDFGHJKMNPQRTVWXY";
char code[6];
size_t steam_alphabet_len = strlen(steam_alphabet);
for (int i = 0; i < 5; i++) {
int mod = bin_code % steam_alphabet_len;
bin_code = bin_code / steam_alphabet_len;
code[i] = steam_alphabet[mod];
}
code[5] = '\0';
return strdup(code);
}
static int
truncate(unsigned const char *hmac, int digits_length, int algo)
{
// take the lower four bits of the last byte
int offset = 0;
switch (algo) {
case SHA1:
offset = (hmac[SHA1_DIGEST_SIZE-1] & 0x0f);
break;
case SHA256:
offset = (hmac[SHA256_DIGEST_SIZE-1] & 0x0f);
break;
case SHA512:
offset = (hmac[SHA512_DIGEST_SIZE-1] & 0x0f);
break;
default:
break;
}
// Starting from the offset, take the successive 4 bytes while stripping the topmost bit to prevent it being handled as a signed integer
int bin_code = ((hmac[offset] & 0x7f) << 24) | ((hmac[offset + 1] & 0xff) << 16) | ((hmac[offset + 2] & 0xff) << 8) | ((hmac[offset + 3] & 0xff));
int token = bin_code % DIGITS_POWER[digits_length];
return token;
}
static unsigned char *
compute_hmac(const char *K, long C, int algo)
{
baseencode_error_t err;
size_t secret_len = (size_t) ((strlen(K) + 1.6 - 1) / 1.6);
char *normalized_K = normalize_secret (K);
if (normalized_K == NULL) {
return NULL;
}
unsigned char *secret = base32_decode(normalized_K, strlen(normalized_K), &err);
free (normalized_K);
if (secret == NULL) {
return NULL;
}
unsigned char C_reverse_byte_order[8];
int j, i;
for (j = 0, i = 7; j < 8 && i >= 0; j++, i--)
C_reverse_byte_order[i] = ((unsigned char *) &C)[j];
gcry_md_hd_t hd;
gcry_md_open(&hd, algo, GCRY_MD_FLAG_HMAC);
gcry_md_setkey(hd, secret, secret_len);
gcry_md_write(hd, C_reverse_byte_order, sizeof(C_reverse_byte_order));
gcry_md_final (hd);
unsigned char *hmac = gcry_md_read(hd, algo);
free(secret);
return hmac;
}
static char *
finalize(int digits_length, int tk)
{
char *token = malloc((size_t)digits_length + 1);
if (token == NULL) {
fprintf (stderr, "Error during memory allocation\n");
return token;
} else {
int extra_char = digits_length < 10 ? 0 : 1;
char *fmt = calloc(1, 5 + extra_char);
if (fmt == NULL) {
fprintf (stderr, "Error during memory allocation\n");
free (token);
return fmt;
}
memcpy (fmt, "%.", 3);
snprintf (fmt + 2, 2 + extra_char, "%d", digits_length);
memcpy (fmt + 3 + extra_char, "d", 2);
snprintf (token, digits_length + 1, fmt, tk);
free (fmt);
}
return token;
}
static int
check_period(int period)
{
if (period <= 0 || period > 120) {
return INVALID_PERIOD;
}
return VALID;
}
static int
check_otp_len(int digits_length)
{
if (digits_length < 3 || digits_length > 10) {
return INVALID_DIGITS;
}
return VALID;
}
static int
check_algo(int algo)
{
if (algo != SHA1 && algo != SHA256 && algo != SHA512) {
return INVALID_ALGO;
} else {
return VALID;
}
}
char *
get_hotp(const char *secret, long timestamp, int digits, int algo, cotp_error_t *err_code)
{
if (check_gcrypt() == -1) {
*err_code = GCRYPT_VERSION_MISMATCH;
return NULL;
}
if (check_algo(algo) == INVALID_ALGO) {
*err_code = INVALID_ALGO;
return NULL;
}
if (check_otp_len(digits) == INVALID_DIGITS) {
*err_code = INVALID_DIGITS;
return NULL;
}
unsigned char *hmac = compute_hmac(secret, timestamp, algo);
if (hmac == NULL) {
*err_code = INVALID_B32_INPUT;
return NULL;
}
int tk = truncate(hmac, digits, algo);
char *token = finalize(digits, tk);
return token;
}
char *
get_totp(const char *secret, int digits, int period, int algo, cotp_error_t *err_code)
{
return get_totp_at(secret, (long)time(NULL), digits, period, algo, err_code);
}
char *
get_steam_totp (const char *secret, int period, cotp_error_t *err_code)
{
// AFAIK, the secret is stored base64 encoded on the device. As I don't have time to waste on reverse engineering
// this non-standard solution, the user is responsible for decoding the secret in whatever format this is and then
// providing the library with the secret base32 encoded.
return get_steam_totp_at (secret, (long)time(NULL), period, err_code);
}
char *
get_totp_at(const char *secret, long current_timestamp, int digits, int period, int algo, cotp_error_t *err_code)
{
if (check_gcrypt() == -1) {
*err_code = GCRYPT_VERSION_MISMATCH;
return NULL;
}
if (check_otp_len(digits) == INVALID_DIGITS) {
*err_code = INVALID_DIGITS;
return NULL;
}
if (check_period(period) == INVALID_PERIOD) {
*err_code = INVALID_PERIOD;
return NULL;
}
long timestamp = current_timestamp / period;
cotp_error_t err;
char *token = get_hotp(secret, timestamp, digits, algo, &err);
if (token == NULL) {
*err_code = err;
return NULL;
}
return token;
}
char *
get_steam_totp_at (const char *secret, long current_timestamp, int period, cotp_error_t *err_code)
{
if (check_gcrypt() == -1) {
*err_code = GCRYPT_VERSION_MISMATCH;
return NULL;
}
if (check_period(period) == INVALID_PERIOD) {
*err_code = INVALID_PERIOD;
return NULL;
}
long timestamp = current_timestamp / period;
unsigned char *hmac = compute_hmac(secret, timestamp, SHA1);
if (hmac == NULL) {
*err_code = INVALID_B32_INPUT;
return NULL;
}
return get_steam_code(hmac);
}
int
totp_verify(const char *secret, const char *user_totp, int digits, int period, int algo)
{
cotp_error_t err;
char *current_totp = get_totp(secret, digits, period, algo, &err);
if (current_totp == NULL) {
return err;
}
int token_status;
if (strcmp(current_totp, user_totp) != 0) {
token_status = INVALID_OTP;
} else {
token_status = VALID;
}
free(current_totp);
return token_status;
}
int
hotp_verify(const char *K, long C, int N, const char *user_hotp, int algo)
{
cotp_error_t err;
char *current_hotp = get_hotp(K, C, N, algo, &err);
if (current_hotp == NULL) {
return err;
}
int token_status;
if (strcmp(current_hotp, user_hotp) != 0) {
token_status = INVALID_OTP;
} else {
token_status = VALID;
}
free(current_hotp);
return token_status;
}

4
launcher/desktop/CMakeLists.txt
View file

@ -24,4 +24,6 @@ target_link_libraries(astra_desktop PUBLIC
astra_core
Qt5::Core
Qt5::Widgets
Qt5::Network)
Qt5::Network
cotp
crypto)

36
launcher/desktop/src/autologinwindow.cpp
View file

@ -13,6 +13,7 @@
#include <QSpinBox>
#include <QToolTip>
#include <keychain.h>
#include <cotp.h>
#include "launchercore.h"
#include "launcherwindow.h"
@ -34,18 +35,18 @@ AutoLoginWindow::AutoLoginWindow(ProfileSettings& profile, LauncherCore& core, Q
mainLayout->addWidget(cancelButton);
auto autologinTimer = new QTimer();
connect(autologinTimer, &QTimer::timeout, [&] {
qDebug() << "logging in!";
connect(autologinTimer, &QTimer::timeout, [&, this, autologinTimer] {
// TODO: this is the second place where I have implemented this. this is a good idea to abstract, maybe? :-)
auto loop = new QEventLoop();
QString username, password;
QString otpSecret;
auto usernameJob = new QKeychain::ReadPasswordJob("LauncherWindow");
usernameJob->setKey(profile.name + "-username");
usernameJob->start();
core.connect(
QObject::connect(
usernameJob, &QKeychain::ReadPasswordJob::finished, [loop, usernameJob, &username](QKeychain::Job* j) {
username = usernameJob->textData();
loop->quit();
@ -57,7 +58,7 @@ AutoLoginWindow::AutoLoginWindow(ProfileSettings& profile, LauncherCore& core, Q
passwordJob->setKey(profile.name + "-password");
passwordJob->start();
core.connect(
QObject::connect(
passwordJob, &QKeychain::ReadPasswordJob::finished, [loop, passwordJob, &password](QKeychain::Job* j) {
password = passwordJob->textData();
loop->quit();
@ -65,16 +66,41 @@ AutoLoginWindow::AutoLoginWindow(ProfileSettings& profile, LauncherCore& core, Q
loop->exec();
// TODO: handle cases where the user doesn't want to store their OTP secret, so we have to manually prompt them
if(profile.useOneTimePassword && profile.rememberOTPSecret) {
auto otpJob = new QKeychain::ReadPasswordJob("LauncherWindow");
otpJob->setKey(profile.name + "-otpsecret");
otpJob->start();
QObject::connect(
otpJob, &QKeychain::ReadPasswordJob::finished, [loop, otpJob, &otpSecret](QKeychain::Job* j) {
otpSecret = otpJob->textData();
loop->quit();
});
loop->exec();
}
auto info = new LoginInformation();
info->settings = &profile;
info->username = username;
info->password = password;
if(profile.useOneTimePassword && profile.rememberOTPSecret) {
// generate otp
char *totp = get_totp (otpSecret.toStdString().c_str(), 6, 30, SHA1, nullptr);
info->oneTimePassword = totp;
free (totp);
}
if (profile.isSapphire) {
core.sapphireLauncher->login(profile.lobbyURL, *info);
} else {
core.squareBoot->bootCheck(*info);
}
close();
autologinTimer->stop();
});
connect(this, &AutoLoginWindow::loginCanceled, [autologinTimer] {
autologinTimer->stop();

2
launcher/desktop/src/settingswindow.cpp
View file

@ -450,7 +450,7 @@ void SettingsWindow::setupLoginTab(QFormLayout& layout) {
connect(otpSecretButton, &QPushButton::pressed, [=] {
auto otpSecret = QInputDialog::getText(this, "OTP Input", "Enter your OTP Secret:");
auto job = new QKeychain::WritePasswordJob("SettingsWindow");
auto job = new QKeychain::WritePasswordJob("LauncherWindow");
job->setTextData(otpSecret);
job->setKey(this->getCurrentProfile().name + "-otpsecret");
job->start();