update: add `--file` command for debugging artifacts from BMC

main
_ 2021-01-19 18:16:43 -06:00
parent b0b6c5672c
commit ce917e7348
2 changed files with 63 additions and 1 deletions

1
.gitattributes vendored Normal file
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@ -0,0 +1 @@
bare_minimum_crypto/cpp/json.hpp linguist-vendored

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@ -1,4 +1,5 @@
#include <chrono> #include <chrono>
#include <fstream>
#include <iostream> #include <iostream>
#include <optional> #include <optional>
#include <stdint.h> #include <stdint.h>
@ -20,6 +21,62 @@ using namespace std;
using nlohmann::json; using nlohmann::json;
using namespace BareMinimumCrypto; using namespace BareMinimumCrypto;
int file (const string & file_path) {
cout << "Reading `" << file_path << "`" << endl;
ifstream f;
f.open (file_path, ifstream::binary);
if (! f.is_open ()) {
cerr << "Can't open file." << endl;
return 1;
}
f.seekg (0, ifstream::end);
const auto len = f.tellg ();
f.seekg (0, ifstream::beg);
vector <uint8_t> bytes;
bytes.resize (len);
f.read ((char *)bytes.data (), bytes.size ());
// All our files are msgpack, so parse it first.
const auto j = json::from_msgpack (bytes);
const string schema = j ["schema"];
cout << "Schema: " << schema << endl;
if (schema == "3T6XF5DZ") {
cout << "File is a passphrase-protected secret key" << endl;
const Instant time_created (j ["time_created"]);
const auto pubkey = j ["pubkey"].get_binary ();
const string key_machine_id = j ["machine_id"];
const auto our_machine_id = get_machine_id ();
const auto now = Instant::now ();
cout << "Generated at Unix time " << time_created.x
<< " (" << now.x - time_created.x << " seconds ago)"
<< endl;
cout << "Generated on machine ID " << key_machine_id << endl;
cout << "Claims to have Base64 pubkey " << base64_encode (pubkey) << endl;
if (now.x < time_created.x) {
cout << "The key was generated in the past. Someone's clock is wrong." << endl;
}
if (our_machine_id != key_machine_id) {
cout << "The key was generated on another machine. You should report this." << endl;
}
}
else {
cout << "Unknown schema. Maybe this file is from a newer version of BMC?" << endl;
}
return 0;
}
int test () { int test () {
if (test_base64 () != 0) { if (test_base64 () != 0) {
return 1; return 1;
@ -72,7 +129,7 @@ int main (int argc, char ** argv) {
cxxopts::Options options ("BareMinimumCrypto", "Simple crypto things you might need."); cxxopts::Options options ("BareMinimumCrypto", "Simple crypto things you might need.");
options.add_options () options.add_options ()
("generate-ca-key", "Generate a passphrase-protected certificate authority key", cxxopts::value <string> ()) ("generate-ca-key", "Generate a passphrase-protected certificate authority key", cxxopts::value <string> ())
("check-ca-key", "Read information from a CA key without decrypting it") ("file", "Print info about any file generated by BMC", cxxopts::value <string> ())
("test", "Run self-test") ("test", "Run self-test")
("help", "Print usage") ("help", "Print usage")
; ;
@ -95,6 +152,10 @@ int main (int argc, char ** argv) {
} }
cout << "The pubkey is `" << base64_encode (key_opt->pubkey ()) << "`" << endl; cout << "The pubkey is `" << base64_encode (key_opt->pubkey ()) << "`" << endl;
} }
else if (result.count ("file")) {
const auto file_path = result ["file"].as <string> ();
return file (file_path);
}
else if (result.count ("test")) { else if (result.count ("test")) {
if (test () != 0) { if (test () != 0) {
return 1; return 1;