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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
#include "WebAuthentication.h"
#include <libb64/cencode.h>
#if defined(ESP32) || defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
#include <MD5Builder.h>
#else
#include "md5.h"
#endif
#include "literals.h"
using namespace asyncsrv;
// Basic Auth hash = base64("username:password")
bool checkBasicAuthentication(const char *hash, const char *username, const char *password) {
if (username == NULL || password == NULL || hash == NULL) {
return false;
}
return generateBasicHash(username, password).equalsIgnoreCase(hash);
}
String generateBasicHash(const char *username, const char *password) {
if (username == NULL || password == NULL) {
return emptyString;
}
size_t toencodeLen = strlen(username) + strlen(password) + 1;
char *toencode = new char[toencodeLen + 1];
if (toencode == NULL) {
return emptyString;
}
char *encoded = new char[base64_encode_expected_len(toencodeLen) + 1];
if (encoded == NULL) {
delete[] toencode;
return emptyString;
}
sprintf_P(toencode, PSTR("%s:%s"), username, password);
if (base64_encode_chars(toencode, toencodeLen, encoded) > 0) {
String res = String(encoded);
delete[] toencode;
delete[] encoded;
return res;
}
delete[] toencode;
delete[] encoded;
return emptyString;
}
static bool getMD5(uint8_t *data, uint16_t len, char *output) { // 33 bytes or more
#if defined(ESP32) || defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
MD5Builder md5;
md5.begin();
md5.add(data, len);
md5.calculate();
md5.getChars(output);
#else
md5_context_t _ctx;
uint8_t *_buf = (uint8_t *)malloc(16);
if (_buf == NULL) {
return false;
}
memset(_buf, 0x00, 16);
MD5Init(&_ctx);
MD5Update(&_ctx, data, len);
MD5Final(_buf, &_ctx);
for (uint8_t i = 0; i < 16; i++) {
sprintf_P(output + (i * 2), PSTR("%02x"), _buf[i]);
}
free(_buf);
#endif
return true;
}
String genRandomMD5() {
#ifdef ESP8266
uint32_t r = RANDOM_REG32;
#else
uint32_t r = rand();
#endif
char *out = (char *)malloc(33);
if (out == NULL || !getMD5((uint8_t *)(&r), 4, out)) {
#ifdef ESP32
log_e("Failed to allocate");
#endif
return emptyString;
}
String res = String(out);
free(out);
return res;
}
static String stringMD5(const String &in) {
char *out = (char *)malloc(33);
if (out == NULL || !getMD5((uint8_t *)(in.c_str()), in.length(), out)) {
#ifdef ESP32
log_e("Failed to allocate");
#endif
return emptyString;
}
String res = String(out);
free(out);
return res;
}
String generateDigestHash(const char *username, const char *password, const char *realm) {
if (username == NULL || password == NULL || realm == NULL) {
return emptyString;
}
char *out = (char *)malloc(33);
if (out == NULL) {
#ifdef ESP32
log_e("Failed to allocate");
#endif
return emptyString;
}
String in;
if (!in.reserve(strlen(username) + strlen(realm) + strlen(password) + 2)) {
#ifdef ESP32
log_e("Failed to allocate");
#endif
free(out);
return emptyString;
}
in.concat(username);
in.concat(':');
in.concat(realm);
in.concat(':');
in.concat(password);
if (!getMD5((uint8_t *)(in.c_str()), in.length(), out)) {
#ifdef ESP32
log_e("Failed to allocate");
#endif
free(out);
return emptyString;
}
in = String(out);
free(out);
return in;
}
bool checkDigestAuthentication(
const char *header, const char *method, const char *username, const char *password, const char *realm, bool passwordIsHash, const char *nonce,
const char *opaque, const char *uri
) {
if (username == NULL || password == NULL || header == NULL || method == NULL) {
// os_printf("AUTH FAIL: missing required fields\n");
return false;
}
String myHeader(header);
int nextBreak = myHeader.indexOf(',');
if (nextBreak < 0) {
// os_printf("AUTH FAIL: no variables\n");
return false;
}
String myUsername;
String myRealm;
String myNonce;
String myUri;
String myResponse;
String myQop;
String myNc;
String myCnonce;
myHeader += (char)0x2c; // ','
myHeader += (char)0x20; // ' '
do {
String avLine(myHeader.substring(0, nextBreak));
avLine.trim();
myHeader = myHeader.substring(nextBreak + 1);
nextBreak = myHeader.indexOf(',');
int eqSign = avLine.indexOf('=');
if (eqSign < 0) {
// os_printf("AUTH FAIL: no = sign\n");
return false;
}
String varName(avLine.substring(0, eqSign));
avLine = avLine.substring(eqSign + 1);
if (avLine.startsWith(String('"'))) {
avLine = avLine.substring(1, avLine.length() - 1);
}
if (varName.equals(T_username)) {
if (!avLine.equals(username)) {
// os_printf("AUTH FAIL: username\n");
return false;
}
myUsername = avLine;
} else if (varName.equals(T_realm)) {
if (realm != NULL && !avLine.equals(realm)) {
// os_printf("AUTH FAIL: realm\n");
return false;
}
myRealm = avLine;
} else if (varName.equals(T_nonce)) {
if (nonce != NULL && !avLine.equals(nonce)) {
// os_printf("AUTH FAIL: nonce\n");
return false;
}
myNonce = avLine;
} else if (varName.equals(T_opaque)) {
if (opaque != NULL && !avLine.equals(opaque)) {
// os_printf("AUTH FAIL: opaque\n");
return false;
}
} else if (varName.equals(T_uri)) {
if (uri != NULL && !avLine.equals(uri)) {
// os_printf("AUTH FAIL: uri\n");
return false;
}
myUri = avLine;
} else if (varName.equals(T_response)) {
myResponse = avLine;
} else if (varName.equals(T_qop)) {
myQop = avLine;
} else if (varName.equals(T_nc)) {
myNc = avLine;
} else if (varName.equals(T_cnonce)) {
myCnonce = avLine;
}
} while (nextBreak > 0);
String ha1 = passwordIsHash ? password : stringMD5(myUsername + ':' + myRealm + ':' + password).c_str();
String ha2 = stringMD5(String(method) + ':' + myUri);
String response = ha1 + ':' + myNonce + ':' + myNc + ':' + myCnonce + ':' + myQop + ':' + ha2;
if (myResponse.equals(stringMD5(response))) {
// os_printf("AUTH SUCCESS\n");
return true;
}
// os_printf("AUTH FAIL: password\n");
return false;
}
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