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#include "utils.h"
#include "parser.h"
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <util/generic/maybe.h>
#include <util/generic/strbuf.h>
#include <array>
namespace {
constexpr const unsigned char b64_encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
constexpr std::array<unsigned char, 256> B64Init() {
std::array<unsigned char, 256> buf{};
for (auto& i : buf)
i = 0xff;
for (int i = 0; i < 64; ++i)
buf[b64_encode[i]] = i;
return buf;
}
constexpr std::array<unsigned char, 256> b64_decode = B64Init();
}
namespace NTvmAuth::NUtils {
TString Bin2base64url(TStringBuf buf) {
if (!buf) {
return TString();
}
TString res;
res.resize(((buf.size() + 2) / 3) << 2, 0);
const unsigned char* pB = (const unsigned char*)buf.data();
const unsigned char* pE = (const unsigned char*)buf.data() + buf.size();
unsigned char* p = (unsigned char*)res.data();
for (; pB + 2 < pE; pB += 3) {
const unsigned char a = *pB;
*p++ = b64_encode[(a >> 2) & 0x3F];
const unsigned char b = *(pB + 1);
*p++ = b64_encode[((a & 0x3) << 4) | ((b & 0xF0) >> 4)];
const unsigned char c = *(pB + 2);
*p++ = b64_encode[((b & 0xF) << 2) | ((c & 0xC0) >> 6)];
*p++ = b64_encode[c & 0x3F];
}
if (pB < pE) {
const unsigned char a = *pB;
*p++ = b64_encode[(a >> 2) & 0x3F];
if (pB == (pE - 1)) {
*p++ = b64_encode[((a & 0x3) << 4)];
} else {
const unsigned char b = *(pB + 1);
*p++ = b64_encode[((a & 0x3) << 4) |
((int)(b & 0xF0) >> 4)];
*p++ = b64_encode[((b & 0xF) << 2)];
}
}
res.resize(p - (unsigned char*)res.data());
return res;
}
TString Base64url2bin(TStringBuf buf) {
const unsigned char* bufin = (const unsigned char*)buf.data();
if (!buf || b64_decode[*bufin] > 63) {
return TString();
}
const unsigned char* bufend = (const unsigned char*)buf.data() + buf.size();
while (++bufin < bufend && b64_decode[*bufin] < 64)
;
int nprbytes = (bufin - (const unsigned char*)buf.data());
int nbytesdecoded = ((nprbytes + 3) / 4) * 3;
if (nprbytes < static_cast<int>(buf.size())) {
int left = buf.size() - nprbytes;
while (left--) {
if (*(bufin++) != '=')
return TString();
}
}
TString res;
res.resize(nbytesdecoded);
unsigned char* bufout = (unsigned char*)res.data();
bufin = (const unsigned char*)buf.data();
while (nprbytes > 4) {
unsigned char a = b64_decode[*bufin];
unsigned char b = b64_decode[bufin[1]];
*(bufout++) = (unsigned char)(a << 2 | b >> 4);
unsigned char c = b64_decode[bufin[2]];
*(bufout++) = (unsigned char)(b << 4 | c >> 2);
unsigned char d = b64_decode[bufin[3]];
*(bufout++) = (unsigned char)(c << 6 | d);
bufin += 4;
nprbytes -= 4;
}
if (nprbytes == 1) {
return {}; // Impossible
}
if (nprbytes > 1) {
*(bufout++) = (unsigned char)(b64_decode[*bufin] << 2 | b64_decode[bufin[1]] >> 4);
}
if (nprbytes > 2) {
*(bufout++) = (unsigned char)(b64_decode[bufin[1]] << 4 | b64_decode[bufin[2]] >> 2);
}
if (nprbytes > 3) {
*(bufout++) = (unsigned char)(b64_decode[bufin[2]] << 6 | b64_decode[bufin[3]]);
}
int diff = (4 - nprbytes) & 3;
if (diff) {
nbytesdecoded -= (4 - nprbytes) & 3;
res.resize(nbytesdecoded);
}
return res;
}
TString SignCgiParamsForTvm(TStringBuf secret, TStringBuf ts, TStringBuf dstTvmId, TStringBuf scopes) {
TString data;
data.reserve(ts.size() + dstTvmId.size() + scopes.size() + 3);
const char DELIM = '|';
data.append(ts).push_back(DELIM);
data.append(dstTvmId).push_back(DELIM);
data.append(scopes).push_back(DELIM);
TString value(EVP_MAX_MD_SIZE, 0);
unsigned macLen = 0;
if (!::HMAC(EVP_sha256(), secret.data(), secret.size(), (unsigned char*)data.data(), data.size(),
(unsigned char*)value.data(), &macLen))
{
return {};
}
if (macLen != EVP_MAX_MD_SIZE) {
value.resize(macLen);
}
return Bin2base64url(value);
}
}
namespace NTvmAuth::NInternal {
TMaybe<TInstant> TCanningKnife::GetExpirationTime(TStringBuf ticket) {
const TParserTickets::TRes res = TParserTickets::ParseV3(ticket, {}, TParserTickets::ServiceFlag());
return res.Status == ETicketStatus::MissingKey || res.Status == ETicketStatus::Expired
? TInstant::Seconds(res.Ticket.expirationtime())
: TMaybe<TInstant>();
}
}
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