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fix(utils): detect time failures via errno #30

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Merged
LimiNode merged 1 commit into from
Sep 3, 2025
Merged

fix(utils): detect time failures via errno #30

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19 changes: 13 additions & 6 deletions hmac_utils.cpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
#include "hmac_utils.hpp"
#include <ctime>
#include <cerrno>
#include <stdexcept>
#include <limits>

Expand All @@ -20,8 +21,9 @@ namespace hmac {
if (interval_sec <= 0) {
throw std::invalid_argument("interval_sec must be positive");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
std::time_t rounded = (now / interval_sec) * interval_sec;
Expand All @@ -32,8 +34,9 @@ namespace hmac {
if (interval_sec <= 0) {
throw std::invalid_argument("interval_sec must be positive");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
std::time_t rounded = (now / interval_sec) * interval_sec;
Expand All @@ -51,8 +54,9 @@ namespace hmac {
if (interval_sec <= 0) {
throw std::invalid_argument("interval_sec must be positive");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
std::time_t rounded = (now / interval_sec) * interval_sec;
Expand All @@ -64,8 +68,9 @@ namespace hmac {
if (interval_sec <= 0) {
throw std::invalid_argument("interval_sec must be positive");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
std::time_t rounded = (now / interval_sec) * interval_sec;
Expand Down Expand Up @@ -144,8 +149,9 @@ namespace hmac {
if (digits < 1 || digits > 9) {
throw std::invalid_argument("TOTP: digits must be in range [1, 9]");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
uint64_t timestamp = static_cast<uint64_t>(now);
Expand Down Expand Up @@ -192,8 +198,9 @@ namespace hmac {
if (digits < 1 || digits > 9) {
throw std::invalid_argument("TOTP: digits must be in range [1, 9]");
}
errno = 0;
std::time_t now = std::time(nullptr);
if (now == static_cast<std::time_t>(-1)) {
if (now == static_cast<std::time_t>(-1) && errno != 0) {
throw std::runtime_error("std::time failed");
}
uint64_t timestamp = static_cast<uint64_t>(now);
Expand Down
41 changes: 41 additions & 0 deletions test_all.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,16 @@
#include <stdexcept>
#include <vector>
#include <limits>
#include <cerrno>

#include "hmac.hpp"
#include "hmac_utils.hpp"

static std::time_t mock_time_value = 0;
static int mock_errno_value = 0;
extern "C" std::time_t time(std::time_t* t) {
if (t) *t = mock_time_value;
errno = mock_errno_value;
return mock_time_value;
}

Expand Down Expand Up @@ -157,6 +160,44 @@ TEST(TokenBoundaryFingerprintTest, MinTime) {
EXPECT_TRUE(hmac::is_token_valid(token_next, key, fingerprint, interval));
}

TEST(TimeErrorTest, MinusOneNoErrno) {
const std::string key = "12345";
mock_time_value = static_cast<std::time_t>(-1);
mock_errno_value = 0;
std::string token;
EXPECT_NO_THROW(token = hmac::generate_time_token(key));
EXPECT_EQ(token, hmac::get_hmac(key, "0", hmac::TypeHash::SHA256));
mock_time_value = 0;
mock_errno_value = 0;
}

TEST(TimeErrorTest, MinusOneWithErrno) {
const std::string key = "12345";
mock_time_value = static_cast<std::time_t>(-1);
mock_errno_value = EINVAL;
EXPECT_THROW(hmac::generate_time_token(key), std::runtime_error);
mock_errno_value = 0;
mock_time_value = 0;
}

TEST(TotpTimeErrorTest, MinusOneNoErrno) {
const std::string key = "12345";
mock_time_value = static_cast<std::time_t>(-1);
mock_errno_value = 0;
EXPECT_NO_THROW(hmac::get_totp_code(key));
mock_time_value = 0;
mock_errno_value = 0;
}

TEST(TotpTimeErrorTest, MinusOneWithErrno) {
const std::string key = "12345";
mock_time_value = static_cast<std::time_t>(-1);
mock_errno_value = EINVAL;
EXPECT_THROW(hmac::get_totp_code(key), std::runtime_error);
mock_errno_value = 0;
mock_time_value = 0;
}

int main(int argc, char **argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
Expand Down
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