+#ifdef USE_POLARSSL
+/*
+ * PolarSSL interface
+ */
+
+#include <polarssl/config.h>
+#include <polarssl/havege.h>
+#include <polarssl/certs.h>
+#include <polarssl/x509.h>
+#include <polarssl/ssl.h>
+#include <polarssl/net.h>
+
+#ifdef POLARSSL_API_V1_2_ABOVE
+int ciphers[] =
+{
+ TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
+ TLS_RSA_WITH_AES_256_CBC_SHA,
+ TLS_RSA_WITH_AES_128_CBC_SHA,
+ 0
+};
+#else
+int ciphers[] =
+{
+ SSL_EDH_RSA_AES_256_SHA,
+ SSL_RSA_AES_256_SHA,
+ SSL_RSA_AES_128_SHA,
+ 0
+};
+#endif
+
+#ifdef POLARSSL_API_V1_3_ABOVE
+static x509_crt certificate;
+static inline int x509parse_keyfile(rsa_context *rsa, const char *path,
+ const char *pwd)
+{
+ int ret;
+ pk_context pk;
+
+ pk_init(&pk);
+ ret = pk_parse_keyfile(&pk, path, pwd);
+ if (ret == 0 && !pk_can_do( &pk, POLARSSL_PK_RSA))
+ ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
+ if (ret == 0)
+ rsa_copy(rsa, pk_rsa(pk));
+ else
+ rsa_free(rsa);
+ pk_free(&pk);
+ return ret;
+}
+#else
+static x509_cert certificate;
+#endif
+
+static rsa_context key;
+bool_t builtInTestCertificate;
+
+#ifdef USE_POLARSSL_HAVEGE
+havege_state hs;
+#else
+int urandom_fd;
+#endif
+
+/* DH prime */
+char *my_dhm_P =
+ "9CE85640903BF123906947FEDE767261" \
+ "D9B4A973EB8F7D984A8C656E2BCC161C" \
+ "183D4CA471BA78225F940F16D1D99CA3" \
+ "E66152CC68EDCE1311A390F307741835" \
+ "44FF6AB553EC7073AD0CB608F2A3B480" \
+ "19E6C02BCED40BD30E91BB2469089670" \
+ "DEF409C08E8AC24D1732A6128D2220DC53";
+char *my_dhm_G = "4";
+
+#ifdef USE_POLARSSL_TESTCERT
+static void initTestCert()
+{
+ int rc;
+ builtInTestCertificate = true;
+#ifdef POLARSSL_API_V1_3_ABOVE
+ rc = x509_crt_parse_rsa(&certificate, (unsigned char *)test_srv_crt,
+ strlen(test_srv_crt));
+#else
+ rc = x509parse_crt(&certificate, (unsigned char *)test_srv_crt,
+ strlen(test_srv_crt));
+#endif
+ if (rc != 0)
+ Log_fatal("Could not parse built-in test certificate");
+}
+
+static void initTestKey()
+{
+ int rc;
+
+ rc = x509parse_key_rsa(&key, (unsigned char *)test_srv_key,
+ strlen(test_srv_key), NULL, 0);
+ if (rc != 0)
+ Log_fatal("Could not parse built-in test RSA key");
+}
+#endif
+
+/*
+ * How to generate a self-signed cert with openssl:
+ * openssl genrsa 1024 > host.key
+ * openssl req -new -x509 -nodes -sha1 -days 365 -key host.key > host.cert
+ */
+static void initCert()
+{
+ int rc;
+ char *crtfile = (char *)getStrConf(CERTIFICATE);
+
+ if (crtfile == NULL) {
+#ifdef USE_POLARSSL_TESTCERT
+ Log_warn("No certificate file specified. Falling back to test certificate.");
+ initTestCert();
+#else
+ Log_fatal("No certificate file specified");
+#endif
+ return;
+ }
+#ifdef POLARSSL_API_V1_3_ABOVE
+ rc = x509_crt_parse_file(&certificate, crtfile);
+#else
+ rc = x509parse_crtfile(&certificate, crtfile);
+#endif
+ if (rc != 0) {
+#ifdef USE_POLARSSL_TESTCERT
+ Log_warn("Could not read certificate file '%s'. Falling back to test certificate.", crtfile);
+ initTestCert();
+#else
+ Log_fatal("Could not read certificate file '%s'", crtfile);
+#endif
+ return;
+ }
+}
+
+static void initKey()
+{
+ int rc;
+ char *keyfile = (char *)getStrConf(KEY);
+
+ if (keyfile == NULL)
+ Log_fatal("No key file specified");
+ rc = x509parse_keyfile(&key, keyfile, NULL);
+ if (rc != 0)
+ Log_fatal("Could not read RSA key file %s", keyfile);
+}
+
+#ifndef USE_POLARSSL_HAVEGE
+int urandom_bytes(void *ctx, unsigned char *dest, size_t len)
+{
+ int cur;
+
+ while (len) {
+ cur = read(urandom_fd, dest, len);
+ if (cur < 0)
+ continue;
+ len -= cur;
+ }
+ return 0;
+}
+#endif
+
+#define DEBUG_LEVEL 0
+static void pssl_debug(void *ctx, int level, const char *str)
+{
+ if (level <= DEBUG_LEVEL)
+ Log_info("PolarSSL [level %d]: %s", level, str);
+}
+
+void SSLi_init(void)
+{
+ char verstring[12];
+
+ initCert();
+#ifdef USE_POLARSSL_TESTCERT
+ if (builtInTestCertificate) {
+ Log_warn("*** Using built-in test certificate and RSA key ***");
+ Log_warn("*** This is not secure! Please use a CA-signed certificate or create a key and self-signed certificate ***");
+ initTestKey();
+ }
+ else
+ initKey();
+#else
+ initKey();
+#endif
+
+ /* Initialize random number generator */
+#ifdef USE_POLARSSL_HAVEGE
+ havege_init(&hs);
+#else
+ urandom_fd = open("/dev/urandom", O_RDONLY);
+ if (urandom_fd < 0)
+ Log_fatal("Cannot open /dev/urandom");
+#endif
+
+ version_get_string(verstring);
+ Log_info("PolarSSL library version %s initialized", verstring);
+}
+
+void SSLi_deinit(void)
+{
+#ifdef POLARSSL_API_V1_3_ABOVE
+ x509_crt_free(&certificate);
+#else
+ x509_free(&certificate);
+#endif
+ rsa_free(&key);
+}
+
+/* Create SHA1 of last certificate in the peer's chain. */
+bool_t SSLi_getSHA1Hash(SSL_handle_t *ssl, uint8_t *hash)
+{
+#ifdef POLARSSL_API_V1_3_ABOVE
+ x509_crt const *cert;
+#else
+ x509_cert const *cert;
+#endif
+#ifdef POLARSSL_API_V1_2_ABOVE
+ cert = ssl_get_peer_cert(ssl);
+#else
+ cert = ssl->peer_cert;
+#endif
+ if (!cert) {
+ return false;
+ }
+ sha1(cert->raw.p, cert->raw.len, hash);
+ return true;
+}
+
+SSL_handle_t *SSLi_newconnection(int *fd, bool_t *SSLready)
+{
+ ssl_context *ssl;
+ ssl_session *ssn;
+ int rc;
+
+ ssl = malloc(sizeof(ssl_context));
+ ssn = malloc(sizeof(ssl_session));
+ if (!ssl || !ssn)
+ Log_fatal("Out of memory");
+ memset(ssl, 0, sizeof(ssl_context));
+ memset(ssn, 0, sizeof(ssl_session));
+
+ rc = ssl_init(ssl);
+ if (rc != 0 )
+ Log_fatal("Failed to initialize: %d", rc);
+
+ ssl_set_endpoint(ssl, SSL_IS_SERVER);
+ ssl_set_authmode(ssl, SSL_VERIFY_OPTIONAL);
+
+#ifdef USE_POLARSSL_HAVEGE
+ ssl_set_rng(ssl, HAVEGE_RAND, &hs);
+#else
+ ssl_set_rng(ssl, urandom_bytes, NULL);
+#endif
+
+ ssl_set_dbg(ssl, pssl_debug, NULL);
+ ssl_set_bio(ssl, net_recv, fd, net_send, fd);
+
+ ssl_set_ciphersuites(ssl, ciphers);
+
+#ifdef POLARSSL_API_V1_2_ABOVE
+ ssl_set_session(ssl, ssn);
+#else
+ ssl_set_session(ssl, 0, 0, ssn);
+#endif
+
+ ssl_set_ca_chain(ssl, &certificate, NULL, NULL);
+#ifdef POLARSSL_API_V1_3_ABOVE
+ ssl_set_own_cert_rsa(ssl, &certificate, &key);
+#else
+ ssl_set_own_cert(ssl, &certificate, &key);
+#endif
+ ssl_set_dh_param(ssl, my_dhm_P, my_dhm_G);
+
+ return ssl;
+}
+
+int SSLi_nonblockaccept(SSL_handle_t *ssl, bool_t *SSLready)
+{
+ int rc;
+
+ rc = ssl_handshake(ssl);
+ if (rc != 0) {
+ if (rc == POLARSSL_ERR_NET_WANT_READ || rc == POLARSSL_ERR_NET_WANT_WRITE) {
+ return 0;
+ } else if (rc == POLARSSL_ERR_X509_CERT_VERIFY_FAILED) { /* Allow this (selfsigned etc) */
+ return 0;
+ } else {
+ Log_warn("SSL handshake failed: %d", rc);
+ return -1;
+ }
+ }
+ *SSLready = true;
+ return 0;
+}
+
+int SSLi_read(SSL_handle_t *ssl, uint8_t *buf, int len)
+{
+ int rc;
+
+ rc = ssl_read(ssl, buf, len);
+ if (rc == POLARSSL_ERR_NET_WANT_READ)
+ return SSLI_ERROR_WANT_READ;
+ return rc;
+}
+
+int SSLi_write(SSL_handle_t *ssl, uint8_t *buf, int len)
+{
+ int rc;
+
+ rc = ssl_write(ssl, buf, len);
+ if (rc == POLARSSL_ERR_NET_WANT_WRITE)
+ return SSLI_ERROR_WANT_WRITE;
+ return rc;
+}
+
+int SSLi_get_error(SSL_handle_t *ssl, int code)
+{
+ return code;
+}
+
+bool_t SSLi_data_pending(SSL_handle_t *ssl)
+{
+ return ssl_get_bytes_avail(ssl) > 0;
+}
+
+void SSLi_shutdown(SSL_handle_t *ssl)
+{
+ ssl_close_notify(ssl);
+}
+
+void SSLi_free(SSL_handle_t *ssl)
+{
+ Log_debug("SSLi_free");
+#if (POLARSSL_VERSION_MINOR <= 2 && POLARSSL_VERSION_PATCH < 6)
+ free(ssl->session); /* Workaround for memory leak in PolarSSL < 1.2.6 */
+ ssl->session = NULL;
+#endif
+ ssl_free(ssl);
+ free(ssl);
+}
+
+#else
+/*
+ * OpenSSL interface
+ */
+
+#include <openssl/x509v3.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/safestack.h>