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src: improve SSL version extraction logic
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The openssl version as defined in ssl libraries is complex.
The current logic to extract the major.minor.patch format
uses C semantics to loop through the text and search for
specific patterns. Use C++ string to tidy it up.

PR-URL: #23050
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
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gireeshpunathil authored and addaleax committed Oct 12, 2018
1 parent 82ea705 commit d3d6cd3
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Showing 3 changed files with 21 additions and 38 deletions.
43 changes: 5 additions & 38 deletions src/node.cc
Original file line number Diff line number Diff line change
Expand Up @@ -232,24 +232,7 @@ class NodeTraceStateObserver :
trace_process->SetString("napi", node_napi_version);

#if HAVE_OPENSSL
// Stupid code to slice out the version string.
{ // NOLINT(whitespace/braces)
size_t i, j, k;
int c;
for (i = j = 0, k = sizeof(OPENSSL_VERSION_TEXT) - 1; i < k; ++i) {
c = OPENSSL_VERSION_TEXT[i];
if ('0' <= c && c <= '9') {
for (j = i + 1; j < k; ++j) {
c = OPENSSL_VERSION_TEXT[j];
if (c == ' ')
break;
}
break;
}
}
trace_process->SetString("openssl",
std::string(&OPENSSL_VERSION_TEXT[i], j - i));
}
trace_process->SetString("openssl", crypto::GetOpenSSLVersion());
#endif
trace_process->EndDictionary();

Expand Down Expand Up @@ -1762,26 +1745,10 @@ void SetupProcessObject(Environment* env,
FIXED_ONE_BYTE_STRING(env->isolate(), node_napi_version));

#if HAVE_OPENSSL
// Stupid code to slice out the version string.
{ // NOLINT(whitespace/braces)
size_t i, j, k;
int c;
for (i = j = 0, k = sizeof(OPENSSL_VERSION_TEXT) - 1; i < k; ++i) {
c = OPENSSL_VERSION_TEXT[i];
if ('0' <= c && c <= '9') {
for (j = i + 1; j < k; ++j) {
c = OPENSSL_VERSION_TEXT[j];
if (c == ' ')
break;
}
break;
}
}
READONLY_PROPERTY(
versions,
"openssl",
OneByteString(env->isolate(), &OPENSSL_VERSION_TEXT[i], j - i));
}
READONLY_PROPERTY(
versions,
"openssl",
OneByteString(env->isolate(), crypto::GetOpenSSLVersion().c_str()));
#endif

// process.arch
Expand Down
15 changes: 15 additions & 0 deletions src/node_crypto.cc
Original file line number Diff line number Diff line change
Expand Up @@ -5734,6 +5734,21 @@ void Initialize(Local<Object> target,
#endif // OPENSSL_NO_SCRYPT
}

constexpr int search(const char* s, int n, int c) {
return *s == c ? n : search(s + 1, n + 1, c);
}

std::string GetOpenSSLVersion() {
// sample openssl version string format
// for reference: "OpenSSL 1.1.0i 14 Aug 2018"
char buf[128];
const int start = search(OPENSSL_VERSION_TEXT, 0, ' ') + 1;
const int end = search(OPENSSL_VERSION_TEXT + start, start, ' ') + 1;
const int len = end - start;
snprintf(buf, len, "%.*s\n", len, &OPENSSL_VERSION_TEXT[start]);
return std::string(buf);
}

} // namespace crypto
} // namespace node

Expand Down
1 change: 1 addition & 0 deletions src/node_crypto.h
Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ extern int VerifyCallback(int preverify_ok, X509_STORE_CTX* ctx);
extern void UseExtraCaCerts(const std::string& file);

void InitCryptoOnce();
std::string GetOpenSSLVersion();

class SecureContext : public BaseObject {
public:
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