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#include "http_digest.h"
#include <library/cpp/digest/md5/md5.h>
#include <util/stream/output.h>
#include <util/stream/str.h>
/************************************************************/
/************************************************************/
static const char* WWW_PREFIX = "Authorization: Digest ";
/************************************************************/
httpDigestHandler::httpDigestHandler()
: User_(nullptr)
, Password_(nullptr)
, Nonce_(nullptr)
, NonceCount_(0)
, HeaderInstruction_(nullptr)
{
}
/************************************************************/
httpDigestHandler::~httpDigestHandler() {
clear();
}
/************************************************************/
void httpDigestHandler::clear() {
free(Nonce_);
free(HeaderInstruction_);
User_ = Password_ = nullptr;
Nonce_ = HeaderInstruction_ = nullptr;
NonceCount_ = 0;
}
/************************************************************/
void httpDigestHandler::setAuthorization(const char* user, const char* password) {
clear();
if (user && password) {
User_ = user;
Password_ = password;
}
}
/************************************************************/
const char* httpDigestHandler::getHeaderInstruction() const {
return HeaderInstruction_;
}
/************************************************************/
Y_FORCE_INLINE void addMD5(MD5& ctx, const char* value) {
ctx.Update((const unsigned char*)(value), strlen(value));
}
Y_FORCE_INLINE void addMD5(MD5& ctx, const char* value, int len) {
ctx.Update((const unsigned char*)(value), len);
}
Y_FORCE_INLINE void addMD5(MD5& ctx, std::string_view str) {
ctx.Update(str);
}
Y_FORCE_INLINE void addMD5Sep(MD5& ctx) {
addMD5(ctx, ":", 1);
}
/************************************************************/
/* calculate H(A1) as per spec */
void httpDigestHandler::digestCalcHA1(const THttpAuthHeader& hd,
char* outSessionKey,
const std::string& outCNonce) {
MD5 ctx;
ctx.Init();
addMD5(ctx, User_);
addMD5Sep(ctx);
addMD5(ctx, hd.realm);
addMD5Sep(ctx);
addMD5(ctx, Password_);
if (hd.algorithm == 1) { //MD5-sess
unsigned char digest[16];
ctx.Final(digest);
ctx.Init();
ctx.Update(digest, 16);
addMD5Sep(ctx);
addMD5(ctx, hd.nonce);
addMD5Sep(ctx);
addMD5(ctx, outCNonce);
ctx.End(outSessionKey);
}
ctx.End(outSessionKey);
}
/************************************************************/
/* calculate request-digest/response-digest as per HTTP Digest spec */
void httpDigestHandler::digestCalcResponse(const THttpAuthHeader& hd,
const char* path,
const char* method,
const char* nonceCount,
char* outResponse,
const std::string& outCNonce) {
char HA1[33];
digestCalcHA1(hd, HA1, outCNonce);
char HA2[33];
MD5 ctx;
ctx.Init();
addMD5(ctx, method);
addMD5Sep(ctx);
addMD5(ctx, path);
//ignore auth-int
ctx.End(HA2);
ctx.Init();
addMD5(ctx, HA1, 32);
addMD5Sep(ctx);
addMD5(ctx, Nonce_);
addMD5Sep(ctx);
if (hd.qop_auth) {
addMD5(ctx, nonceCount, 8);
addMD5Sep(ctx);
addMD5(ctx, outCNonce);
addMD5Sep(ctx);
addMD5(ctx, "auth", 4);
addMD5Sep(ctx);
}
addMD5(ctx, HA2, 32);
ctx.End(outResponse);
}
/************************************************************/
bool httpDigestHandler::processHeader(const THttpAuthHeader* header,
const char* path,
const char* method,
const char* cnonceIn) {
if (!User_ || !header || !header->use_auth || !header->realm || !header->nonce)
return false;
if (Nonce_) {
if (strcmp(Nonce_, header->nonce)) {
free(Nonce_);
Nonce_ = nullptr;
NonceCount_ = 0;
}
}
if (!Nonce_) {
Nonce_ = strdup(header->nonce);
NonceCount_ = 0;
}
free(HeaderInstruction_);
HeaderInstruction_ = nullptr;
NonceCount_++;
char nonceCount[20];
snprintf(nonceCount, sizeof(nonceCount), "%08d", NonceCount_);
std::string cNonce = cnonceIn ? std::string(cnonceIn) : std::to_string(time(nullptr));
char response[33];
digestCalcResponse(*header, path, method, nonceCount, response, cNonce);
//digest-response = 1#( username | realm | nonce | digest-uri
// | response | [ algorithm ] | [cnonce] |
// [opaque] | [message-qop] |
// [nonce-count] | [auth-param] )
TStringStream out;
out << WWW_PREFIX << "username=\"" << User_ << "\"";
out << ", realm=\"" << header->realm << "\"";
out << ", nonce=\"" << header->nonce << "\"";
out << ", uri=\"" << path << "\"";
if (header->algorithm == 1)
out << ", algorithm=MD5-sess";
else
out << ", algorithm=MD5";
if (header->qop_auth)
out << ", qop=auth";
out << ", nc=" << nonceCount;
if (!cNonce.empty())
out << ", cnonce=\"" << cNonce << "\"";
out << ", response=\"" << response << "\"";
if (header->opaque)
out << ", opaque=\"" << header->opaque << "\"";
out << "\r\n";
TString s_out = out.Str();
HeaderInstruction_ = strdup(s_out.c_str());
return true;
}
/************************************************************/
/************************************************************/
|
