Kent Sommer
7 years ago
10 changed files with 1390 additions and 64 deletions
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// Copyright (c) 2017 The Zen Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <stdio.h> |
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#include <vector> |
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#include <openssl/rsa.h> |
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#include <openssl/x509.h> |
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#include <openssl/pem.h> |
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#include <openssl/rand.h> |
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#include <openssl/ssl.h> |
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#include <boost/filesystem/path.hpp> |
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#include <boost/filesystem/operations.hpp> |
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#include "util.h" |
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#include "utiltls.h" |
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// Set of most common default trusted certificates directories used by OpenSSL
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static const char* defaultTrustedDirs[] = |
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{ |
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#ifdef WIN32 |
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"" |
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#elif MAC_OSX |
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"/System/Library/OpenSSL/certs" |
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#else // Linux build
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"/etc/ssl/certs", |
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"/usr/local/ssl/certs", |
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"/usr/lib/ssl/certs", |
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"/usr/share/ssl/certs", |
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"/etc/pki/tls/certs", |
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"/var/lib/ca-certificates" |
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#endif |
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}; |
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// Default root certificates (PEM encoded)
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static const char defaultRootCerts[] = |
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{ |
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// // Example of specifying a certificate
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// //
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// "-----BEGIN CERTIFICATE-----\n"
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// "MIIDYDCCAkigAwIBAgIJAJMakdoBYY67MA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV\n"
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// "BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX\n"
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// "aWRnaXRzIFB0eSBMdGQwHhcNMTcwODE0MTc0MTMyWhcNNDQxMjMwMTc0MTMyWjBF\n"
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// "MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50\n"
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// "ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB\n"
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// "CgKCAQEAzNV+SPRCKSEGlntfpCRMVSfz99NoEo3K1SRyw6GTSb1LNSTQCn1EsCSH\n"
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// "cVZTmyfjcTHpwz4aF14yw8lQC42f218AOsG1DV5suCaUXhSmZlajMkvEJVwfBOft\n"
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// "xpcqE1fA9wovXlnJLXVgyJGMc896S8tcbrCU/l/BsqKh5QX8N60MQ3w376nSGvVP\n"
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// "ussN8bVH3aKRwjhateqx1GRt0GPnM8/u7EkgF8Bc+m8WZYcUfkPC5Am2D0MO1HOA\n"
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// "u3IKxXZMs/fYd6nF5DZBwg+D23EP/V8oqenn8ilvrSORq5PguOl1QoDyY66PhmjN\n"
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// "L9c4Spxw8HXUDlrfuSQn2NJnw1XhdQIDAQABo1MwUTAdBgNVHQ4EFgQU/KD+n5Bz\n"
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// "QLbp09qKzwwyNwOQU4swHwYDVR0jBBgwFoAU/KD+n5BzQLbp09qKzwwyNwOQU4sw\n"
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// "DwYDVR0TAQH/BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAVtprBxZD6O+WNYUM\n"
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// "ksdKiVVoszEJXlt7wajuaPBPK/K3buxE9FLVxS+LiH1PUhPCc6V28guyKWwn109/\n"
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// "4WnO51LQjygvd7SaePlbiO7iIatkOk4oETJQZ+tEJ7fv/NITY/GQUfgPNkANmPPz\n"
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// "Mz9I6He8XhIpO6NGuDG+74aR1RhvR3PWJJYT0QpL0STVR4qTc/HfnymF5XnnjOYZ\n"
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// "mwzT8jXX5dhLYwJmyPBS+uv+oa1quM/FitA63N9anYtRBiPaBtund9Ikjat1hM0h\n"
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// "neo2tz7Mfsgjb0aiORtiyaH2OetvwR0QuCSVPnknkfGWPDINdUdkgKyA1PX58Smw\n"
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// "vaXEcw==\n"
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// "-----END CERTIFICATE-----"
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"" |
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}; |
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// Generates RSA keypair (a private key of 'bits' length for a specified 'uPublicKey')
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//
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static EVP_PKEY* GenerateRsaKey(int bits, BN_ULONG uPublicKey) |
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{ |
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EVP_PKEY *evpPrivKey = NULL; |
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BIGNUM *pubKey = BN_new(); |
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if (pubKey) |
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{ |
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if (BN_set_word(pubKey, uPublicKey)) |
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{ |
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RSA *privKey = RSA_new(); |
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if (privKey) |
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{ |
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if (RAND_poll() && // The pseudo-random number generator must be seeded prior to calling RSA_generate_key_ex(). (https://www.openssl.org/docs/man1.1.0/crypto/RSA_generate_key.html)
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RSA_generate_key_ex(privKey, bits, pubKey, NULL)) |
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{ |
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if ((evpPrivKey = EVP_PKEY_new())) |
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{ |
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if (!EVP_PKEY_assign_RSA(evpPrivKey, privKey)) |
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{ |
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EVP_PKEY_free(evpPrivKey); |
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evpPrivKey = NULL; |
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} |
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} |
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} |
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if(!evpPrivKey) // EVP_PKEY_assign_RSA uses the supplied key internally
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RSA_free(privKey); |
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} |
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} |
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BN_free(pubKey); |
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} |
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return evpPrivKey; |
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} |
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// Generates certificate for a specified public key using a corresponding private key (both of them should be specified in the 'keypair').
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//
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static X509* GenerateCertificate(EVP_PKEY *keypair) |
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{ |
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if (!keypair) |
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return NULL; |
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X509 *cert = X509_new(); |
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if (cert) |
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{ |
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bool bCertSigned = false; |
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long sn = 0; |
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if (RAND_bytes((unsigned char*)&sn, sizeof sn) && |
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ASN1_INTEGER_set(X509_get_serialNumber(cert), sn)) |
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{ |
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X509_gmtime_adj(X509_get_notBefore(cert), 0); |
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X509_gmtime_adj(X509_get_notAfter(cert), (60 * 60 * 24 * CERT_VALIDITY_DAYS)); |
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// setting a public key from the keypair
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if (X509_set_pubkey(cert, keypair)) |
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{ |
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X509_NAME *subjectName = X509_get_subject_name(cert); |
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if (subjectName) |
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{ |
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// an issuer name is the same as a subject name, due to certificate is self-signed
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if (X509_set_issuer_name(cert, subjectName)) |
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{ |
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// private key from keypair is used; signature will be set inside of the cert
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bCertSigned = X509_sign(cert, keypair, EVP_sha512()); |
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} |
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} |
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} |
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} |
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if (!bCertSigned) |
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{ |
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X509_free(cert); |
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cert = NULL; |
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} |
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} |
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return cert; |
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} |
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// Stores key to file, specified by the 'filePath'
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//
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static bool StoreKey(EVP_PKEY *key, const boost::filesystem::path &filePath, const std::string &passphrase) |
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{ |
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if (!key) |
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return false; |
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bool bStored = false; |
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FILE *keyfd = fopen(filePath.string().c_str(), "wb"); |
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if (keyfd) |
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{ |
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const EVP_CIPHER* pCipher = NULL; |
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if (passphrase.length() && (pCipher = EVP_aes_256_cbc())) |
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bStored = PEM_write_PrivateKey(keyfd, key, pCipher, NULL, 0, NULL, (void*)passphrase.c_str()); |
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else |
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bStored = PEM_write_PrivateKey(keyfd, key, NULL, NULL, 0, NULL, NULL); |
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fclose(keyfd); |
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} |
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return bStored; |
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} |
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// Stores certificate to file, specified by the 'filePath'
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//
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static bool StoreCertificate(X509 *cert, const boost::filesystem::path &filePath) |
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{ |
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if (!cert) |
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return false; |
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bool bStored = false; |
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FILE *certfd = fopen(filePath.string().c_str(), "wb"); |
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if (certfd) |
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{ |
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bStored = PEM_write_X509(certfd, cert); |
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fclose(certfd); |
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} |
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return bStored; |
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} |
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// Loads key from file, specified by the 'filePath'
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//
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static EVP_PKEY* LoadKey(const boost::filesystem::path &filePath, const std::string &passphrase) |
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{ |
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if (!boost::filesystem::exists(filePath)) |
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return NULL; |
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EVP_PKEY *key = NULL; |
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FILE *keyfd = fopen(filePath.string().c_str(), "rb"); |
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if (keyfd) |
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{ |
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key = PEM_read_PrivateKey(keyfd, NULL, NULL, passphrase.length() ? (void*)passphrase.c_str() : NULL); |
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fclose(keyfd); |
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} |
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return key; |
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} |
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// Loads certificate from file, specified by the 'filePath'
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//
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static X509* LoadCertificate(const boost::filesystem::path &filePath) |
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{ |
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if (!boost::filesystem::exists(filePath)) |
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return NULL; |
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X509 *cert = NULL; |
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FILE *certfd = fopen(filePath.string().c_str(), "rb"); |
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if (certfd) |
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{ |
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cert = PEM_read_X509(certfd, NULL, NULL, NULL); |
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fclose(certfd); |
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} |
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return cert; |
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} |
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// Verifies if the private key in 'key' matches the public key in 'cert'
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// (Signs random bytes on 'key' and verifies signature correctness on public key from 'cert')
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//
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static bool IsMatching(EVP_PKEY *key, X509 *cert) |
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{ |
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if (!key || !cert) |
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return false; |
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bool bIsMatching = false; |
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EVP_PKEY_CTX *ctxSign = EVP_PKEY_CTX_new(key, NULL); |
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if (ctxSign) |
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{ |
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if (EVP_PKEY_sign_init(ctxSign) == 1 && |
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EVP_PKEY_CTX_set_signature_md(ctxSign, EVP_sha512()) > 0) |
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{ |
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unsigned char digest[SHA512_DIGEST_LENGTH] = { 0 }; |
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size_t digestSize = sizeof digest, signatureSize = 0; |
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if (RAND_bytes((unsigned char*)&digest, digestSize) && // set random bytes as a digest
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EVP_PKEY_sign(ctxSign, NULL, &signatureSize, digest, digestSize) == 1) // determine buffer length
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{ |
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unsigned char *signature = (unsigned char*)OPENSSL_malloc(signatureSize); |
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if (signature) |
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{ |
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if (EVP_PKEY_sign(ctxSign, signature, &signatureSize, digest, digestSize) == 1) |
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{ |
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EVP_PKEY *pubkey = X509_get_pubkey(cert); |
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if (pubkey) |
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{ |
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EVP_PKEY_CTX *ctxVerif = EVP_PKEY_CTX_new(pubkey, NULL); |
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if (ctxVerif) |
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{ |
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if (EVP_PKEY_verify_init(ctxVerif) == 1 && |
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EVP_PKEY_CTX_set_signature_md(ctxVerif, EVP_sha512()) > 0) |
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{ |
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bIsMatching = (EVP_PKEY_verify(ctxVerif, signature, signatureSize, digest, digestSize) == 1); |
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} |
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EVP_PKEY_CTX_free(ctxVerif); |
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} |
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EVP_PKEY_free(pubkey); |
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} |
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} |
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OPENSSL_free(signature); |
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} |
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} |
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} |
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EVP_PKEY_CTX_free(ctxSign); |
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} |
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return bIsMatching; |
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} |
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// Checks the correctness of a private-public key pair and the validity of a certificate using public key from key pair
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//
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static bool CheckCredentials(EVP_PKEY *key, X509 *cert) |
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{ |
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if (!key || !cert) |
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return false; |
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bool bIsOk = false; |
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// Validating the correctness of a private-public key pair, depending on a key type
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//
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switch (EVP_PKEY_base_id(key)) |
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{ |
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case EVP_PKEY_RSA: |
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case EVP_PKEY_RSA2: |
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{ |
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RSA *rsaKey = EVP_PKEY_get1_RSA(key); |
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if (rsaKey) |
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{ |
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bIsOk = (RSA_check_key(rsaKey) == 1); |
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RSA_free(rsaKey); |
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} |
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break; |
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} |
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// Currently only RSA keys are supported.
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// Other key types can be added here in further.
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default: |
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bIsOk = false; |
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} |
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// Verifying if the private key matches the public key in certificate
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if (bIsOk) |
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bIsOk = IsMatching(key, cert); |
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return bIsOk; |
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} |
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// Verifies credentials (a private key, a certificate for public key and a correspondence between the private and the public key)
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//
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CredentialsStatus VerifyCredentials( |
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const boost::filesystem::path &keyPath, |
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const boost::filesystem::path &certPath, |
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const std::string &passphrase) |
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{ |
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CredentialsStatus status = credAbsent; |
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EVP_PKEY *key = NULL; |
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X509 *cert = NULL; |
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key = LoadKey(keyPath, passphrase); |
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cert = LoadCertificate(certPath); |
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if (key && cert) |
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status = CheckCredentials(key, cert) ? credOk : credNonConsistent; |
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else if (!key && !cert) |
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status = credAbsent; |
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else |
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status = credPartiallyAbsent; |
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if (key) |
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EVP_PKEY_free(key); |
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if (cert) |
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X509_free(cert); |
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return status; |
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} |
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// Generates public key pair and the self-signed certificate for it, and then stores them by the specified paths 'keyPath' and 'certPath' respectively.
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//
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bool GenerateCredentials( |
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const boost::filesystem::path &keyPath, |
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const boost::filesystem::path &certPath, |
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const std::string &passphrase) |
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{ |
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bool bGenerated = false; |
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EVP_PKEY *key = NULL; |
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X509 *cert = NULL; |
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// Generating RSA key and the self-signed certificate for it
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//
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key = GenerateRsaKey(TLS_RSA_KEY_SIZE, RSA_F4); |
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if (key) |
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{ |
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cert = GenerateCertificate(key); |
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if (cert) |
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{ |
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if (StoreKey(key, keyPath, passphrase) && |
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StoreCertificate(cert, certPath)) |
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{ |
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bGenerated = true; |
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LogPrintStr("TLS: New private key and self-signed certificate were generated successfully\n"); |
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} |
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X509_free(cert); |
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} |
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EVP_PKEY_free(key); |
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} |
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return bGenerated; |
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} |
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// Checks if certificate of a peer is valid (by internal means of the TLS protocol)
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//
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// Validates peer certificate using a chain of CA certificates.
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// If some of intermediate CA certificates are absent in the trusted certificates store, then validation status will be 'false')
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//
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bool ValidatePeerCertificate(SSL *ssl) |
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{ |
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if (!ssl) |
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return false; |
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bool bIsOk = false; |
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X509 *cert = SSL_get_peer_certificate (ssl); |
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if (cert) |
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{ |
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// NOTE: SSL_get_verify_result() is only useful in connection with SSL_get_peer_certificate (https://www.openssl.org/docs/man1.0.2/ssl/SSL_get_verify_result.html)
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//
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bIsOk = (SSL_get_verify_result(ssl) == X509_V_OK); |
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X509_free(cert); |
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} |
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else |
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{ |
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LogPrint("net", "TLS: Peer does not have certificate\n"); |
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bIsOk = false; |
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} |
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return bIsOk; |
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} |
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// Check if a given context is set up with a cert that can be validated by this context
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//
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bool ValidateCertificate(SSL_CTX *ssl_ctx) |
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{ |
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if (!ssl_ctx) |
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return false; |
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bool bIsOk = false; |
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X509_STORE *store = SSL_CTX_get_cert_store(ssl_ctx); |
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if (store) |
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{ |
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X509_STORE_CTX *ctx = X509_STORE_CTX_new(); |
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if (ctx) |
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{ |
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if (X509_STORE_CTX_init(ctx, store, SSL_CTX_get0_certificate(ssl_ctx), NULL) == 1) |
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bIsOk = X509_verify_cert(ctx) == 1; |
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X509_STORE_CTX_free(ctx); |
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} |
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} |
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return bIsOk; |
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} |
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// Creates the list of available OpenSSL default directories for trusted certificates storage
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//
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std::vector<boost::filesystem::path> GetDefaultTrustedDirectories() |
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{ |
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namespace fs = boost::filesystem; |
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std::vector<fs::path> defaultDirectoriesList; |
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// Default certificates directory specified in OpenSSL build
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fs::path libDefaultDir = X509_get_default_cert_dir(); |
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if (fs::exists(libDefaultDir)) |
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defaultDirectoriesList.push_back(libDefaultDir); |
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// Check and set all possible standard default directories
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for (const char *dir : defaultTrustedDirs) |
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{ |
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fs::path defaultDir(dir); |
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if (defaultDir != libDefaultDir && |
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fs::exists(defaultDir)) |
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defaultDirectoriesList.push_back(defaultDir); |
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} |
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return defaultDirectoriesList; |
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} |
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// Loads default root certificates (placed in the 'defaultRootCerts') into the specified context.
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// Returns the number of loaded certificates.
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//
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int LoadDefaultRootCertificates(SSL_CTX *ctx) |
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{ |
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if (!ctx) |
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return 0; |
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int certsLoaded = 0; |
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// Certificate text buffer 'defaultRootCerts' is a C string with certificates in PEM format
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BIO *memBuf = BIO_new_mem_buf(defaultRootCerts, -1); |
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if (memBuf) |
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{ |
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X509 *cert = NULL; |
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while ((cert = PEM_read_bio_X509(memBuf, NULL, 0, NULL))) |
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{ |
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if (X509_STORE_add_cert(SSL_CTX_get_cert_store(ctx), cert) > 0) |
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certsLoaded++; |
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X509_free(cert); |
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} |
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BIO_free(memBuf); |
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} |
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return certsLoaded; |
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} |
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@ -0,0 +1,53 @@ |
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// Copyright (c) 2017 The Zen Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef UTILTLS_H |
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#define UTILTLS_H |
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#include <boost/filesystem/path.hpp> |
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#define TLS_KEY_FILE_NAME "key.pem" // default name of a private key
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#define TLS_CERT_FILE_NAME "cert.pem" // default name of a certificate
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#define CERT_VALIDITY_DAYS (365 * 10) // period of validity, in days, for a self-signed certificate
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#define TLS_RSA_KEY_SIZE 2048 // size of a private RSA key, in bits, that will be generated, if no other key is specified
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typedef enum {credOk, credNonConsistent, credAbsent, credPartiallyAbsent} CredentialsStatus; |
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// Verifies credentials (a private key, a certificate for public key and a correspondence between the private and the public key)
|
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//
|
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CredentialsStatus VerifyCredentials( |
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const boost::filesystem::path &keyPath, |
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const boost::filesystem::path &certPath, |
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const std::string &passphrase); |
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|
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// Generates public key pair and the self-signed certificate for it, and then stores them by the specified paths 'keyPath' and 'certPath' respectively.
|
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//
|
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bool GenerateCredentials( |
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const boost::filesystem::path &keyPath, |
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const boost::filesystem::path &certPath, |
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const std::string &passphrase); |
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|
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// Checks if certificate of a peer is valid (by internal means of the TLS protocol)
|
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//
|
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// Validates peer certificate using a chain of CA certificates.
|
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// If some of intermediate CA certificates are absent in the trusted certificates store, then validation status will be 'false')
|
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//
|
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bool ValidatePeerCertificate(SSL *ssl); |
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|
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// Check if a given context is set up with a cert that can be validated by this context
|
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//
|
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bool ValidateCertificate(SSL_CTX *ssl_ctx); |
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|
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// Creates the list of available OpenSSL default directories for trusted certificates storage
|
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//
|
|||
std::vector<boost::filesystem::path> GetDefaultTrustedDirectories(); |
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|
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// Loads default root certificates (placed in the 'defaultRootCerts') into the specified context.
|
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// Returns the number of loaded certificates.
|
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//
|
|||
int LoadDefaultRootCertificates(SSL_CTX *ctx); |
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|
|||
#endif // UTILTLS_H
|
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Reference in new issue