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Ensure that all uses of strncpy in wifi component are safe. (#5636)

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Kevin P. Fleming 2023-10-31 17:30:42 -04:00 committed by Jesse Hills
parent eae3089201
commit ef2531edf3
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GPG Key ID: BEAAE804EFD8E83A
4 changed files with 14 additions and 14 deletions
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4
esphome/components/wifi/wifi_component.cpp
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@ -261,8 +261,8 @@ void WiFiComponent::set_sta(const WiFiAP &ap) {
void WiFiComponent::clear_sta() { this->sta_.clear(); }
void WiFiComponent::save_wifi_sta(const std::string &ssid, const std::string &password) {
SavedWifiSettings save{};
strncpy(save.ssid, ssid.c_str(), sizeof(save.ssid));
strncpy(save.password, password.c_str(), sizeof(save.password));
strncpy(save.ssid, ssid.c_str(), sizeof(save.ssid) - 1);
strncpy(save.password, password.c_str(), sizeof(save.password) - 1);
this->pref_.save(&save);
// ensure it's written immediately
global_preferences->sync();

8
esphome/components/wifi/wifi_component_esp32_arduino.cpp
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@ -164,8 +164,8 @@ bool WiFiComponent::wifi_sta_connect_(const WiFiAP &ap) {
// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_wifi.html#_CPPv417wifi_sta_config_t
wifi_config_t conf;
memset(&conf, 0, sizeof(conf));
strncpy(reinterpret_cast<char *>(conf.sta.ssid), ap.get_ssid().c_str(), sizeof(conf.sta.ssid));
strncpy(reinterpret_cast<char *>(conf.sta.password), ap.get_password().c_str(), sizeof(conf.sta.password));
strncpy(reinterpret_cast<char *>(conf.sta.ssid), ap.get_ssid().c_str(), sizeof(conf.sta.ssid) - 1);
strncpy(reinterpret_cast<char *>(conf.sta.password), ap.get_password().c_str(), sizeof(conf.sta.password) - 1);
// The weakest authmode to accept in the fast scan mode
if (ap.get_password().empty()) {
@ -661,7 +661,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
wifi_config_t conf;
memset(&conf, 0, sizeof(conf));
strncpy(reinterpret_cast<char *>(conf.ap.ssid), ap.get_ssid().c_str(), sizeof(conf.ap.ssid));
strncpy(reinterpret_cast<char *>(conf.ap.ssid), ap.get_ssid().c_str(), sizeof(conf.ap.ssid) - 1);
conf.ap.channel = ap.get_channel().value_or(1);
conf.ap.ssid_hidden = ap.get_ssid().size();
conf.ap.max_connection = 5;
@ -672,7 +672,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
*conf.ap.password = 0;
} else {
conf.ap.authmode = WIFI_AUTH_WPA2_PSK;
strncpy(reinterpret_cast<char *>(conf.ap.password), ap.get_password().c_str(), sizeof(conf.ap.ssid));
strncpy(reinterpret_cast<char *>(conf.ap.password), ap.get_password().c_str(), sizeof(conf.ap.ssid) - 1);
}
conf.ap.pairwise_cipher = WIFI_CIPHER_TYPE_CCMP;

8
esphome/components/wifi/wifi_component_esp8266.cpp
View File

@ -230,8 +230,8 @@ bool WiFiComponent::wifi_sta_connect_(const WiFiAP &ap) {
struct station_config conf {};
memset(&conf, 0, sizeof(conf));
strncpy(reinterpret_cast<char *>(conf.ssid), ap.get_ssid().c_str(), sizeof(conf.ssid));
strncpy(reinterpret_cast<char *>(conf.password), ap.get_password().c_str(), sizeof(conf.password));
strncpy(reinterpret_cast<char *>(conf.ssid), ap.get_ssid().c_str(), sizeof(conf.ssid) - 1);
strncpy(reinterpret_cast<char *>(conf.password), ap.get_password().c_str(), sizeof(conf.password) - 1);
if (ap.get_bssid().has_value()) {
conf.bssid_set = 1;
@ -759,7 +759,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
return false;
struct softap_config conf {};
strncpy(reinterpret_cast<char *>(conf.ssid), ap.get_ssid().c_str(), sizeof(conf.ssid));
strncpy(reinterpret_cast<char *>(conf.ssid), ap.get_ssid().c_str(), sizeof(conf.ssid) - 1);
conf.ssid_len = static_cast<uint8>(ap.get_ssid().size());
conf.channel = ap.get_channel().value_or(1);
conf.ssid_hidden = ap.get_hidden();
@ -771,7 +771,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
*conf.password = 0;
} else {
conf.authmode = AUTH_WPA2_PSK;
strncpy(reinterpret_cast<char *>(conf.password), ap.get_password().c_str(), sizeof(conf.password));
strncpy(reinterpret_cast<char *>(conf.password), ap.get_password().c_str(), sizeof(conf.password) - 1);
}
ETS_UART_INTR_DISABLE();

8
esphome/components/wifi/wifi_component_esp_idf.cpp
View File

@ -275,8 +275,8 @@ bool WiFiComponent::wifi_sta_connect_(const WiFiAP &ap) {
// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_wifi.html#_CPPv417wifi_sta_config_t
wifi_config_t conf;
memset(&conf, 0, sizeof(conf));
strncpy(reinterpret_cast<char *>(conf.sta.ssid), ap.get_ssid().c_str(), sizeof(conf.sta.ssid));
strncpy(reinterpret_cast<char *>(conf.sta.password), ap.get_password().c_str(), sizeof(conf.sta.password));
strncpy(reinterpret_cast<char *>(conf.sta.ssid), ap.get_ssid().c_str(), sizeof(conf.sta.ssid) - 1);
strncpy(reinterpret_cast<char *>(conf.sta.password), ap.get_password().c_str(), sizeof(conf.sta.password) - 1);
// The weakest authmode to accept in the fast scan mode
if (ap.get_password().empty()) {
@ -823,7 +823,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
wifi_config_t conf;
memset(&conf, 0, sizeof(conf));
strncpy(reinterpret_cast<char *>(conf.ap.ssid), ap.get_ssid().c_str(), sizeof(conf.ap.ssid));
strncpy(reinterpret_cast<char *>(conf.ap.ssid), ap.get_ssid().c_str(), sizeof(conf.ap.ssid) - 1);
conf.ap.channel = ap.get_channel().value_or(1);
conf.ap.ssid_hidden = ap.get_ssid().size();
conf.ap.max_connection = 5;
@ -834,7 +834,7 @@ bool WiFiComponent::wifi_start_ap_(const WiFiAP &ap) {
*conf.ap.password = 0;
} else {
conf.ap.authmode = WIFI_AUTH_WPA2_PSK;
strncpy(reinterpret_cast<char *>(conf.ap.password), ap.get_password().c_str(), sizeof(conf.ap.password));
strncpy(reinterpret_cast<char *>(conf.ap.password), ap.get_password().c_str(), sizeof(conf.ap.password) - 1);
}
// pairwise cipher of SoftAP, group cipher will be derived using this.