/*
* ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c) 2005-2008 Florian Westphal <fw@strlen.de>
+ * Copyright (c)2005-2008 Florian Westphal (fw@strlen.de).
+ * Copyright (c)2008-2014 Alexander Barton (alex@barton.de) and Contributors.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * Please read the file COPYING, README and AUTHORS for more information.
*/
#include "portab.h"
* SSL wrapper functions
*/
-#include "imp.h"
#include "conf-ssl.h"
#ifdef SSL_SUPPORT
#include "conn-ssl.h"
#include "log.h"
-#include "exp.h"
#include "defines.h"
extern struct SSLOptions Conf_SSLOptions;
#define DH_BITS 2048
#define DH_BITS_MIN 1024
+#define MAX_HASH_SIZE 64 /* from gnutls-int.h */
+
static gnutls_certificate_credentials_t x509_cred;
static gnutls_dh_params_t dh_params;
+static gnutls_priority_t priorities_cache;
static bool ConnSSL_LoadServerKey_gnutls PARAMS(( void ));
#endif
+#define SHA256_STRING_LEN (32 * 2 + 1)
+
static bool ConnSSL_Init_SSL PARAMS(( CONNECTION *c ));
static int ConnectAccept PARAMS(( CONNECTION *c, bool connect ));
static int ConnSSL_HandleError PARAMS(( CONNECTION *c, const int code, const char *fname ));
#ifdef HAVE_LIBSSL
+/**
+ * Log OpenSSL error message.
+ *
+ * @param msg The error message.
+ * @param info Additional information text or NULL.
+ */
static void
-LogOpenSSLError( const char *msg, const char *msg2 )
+LogOpenSSLError(const char *error, const char *info)
{
unsigned long err = ERR_get_error();
- char * errmsg = err ? ERR_error_string(err, NULL) : "Unable to determine error";
+ char * errmsg = err
+ ? ERR_error_string(err, NULL)
+ : "Unable to determine error";
+
+ assert(error != NULL);
- if (!msg) msg = "SSL Error";
- if (msg2)
- Log( LOG_ERR, "%s: %s: %s", msg, msg2, errmsg);
+ if (info)
+ Log(LOG_ERR, "%s: %s (%s)", error, info, errmsg);
else
- Log( LOG_ERR, "%s: %s", msg, errmsg);
+ Log(LOG_ERR, "%s: %s", error, errmsg);
}
LogDebug("pem_passwd_cb buf size %d, array size %d", size, passlen);
assert(passlen >= 0);
if (passlen <= 0) {
- Log(LOG_ERR, "pem_passwd_cb: password required, but not set");
+ Log(LOG_ERR, "PEM password required but not set [in pem_passwd_cb()]!");
return 0;
}
size = passlen > size ? size : passlen;
memcpy(buf, (char *)(array_start(pass)), size);
return size;
}
+
+
+static int
+Verify_openssl(UNUSED int preverify_ok, UNUSED X509_STORE_CTX *x509_ctx)
+{
+ return 1;
+}
#endif
}
dh_params = PEM_read_DHparams(fp, NULL, NULL, NULL);
if (!dh_params) {
- Log(LOG_ERR, "%s: PEM_read_DHparams failed!",
+ Log(LOG_ERR, "%s: Failed to read SSL DH parameters!",
Conf_SSLOptions.DHFile);
ret = false;
}
err = gnutls_dh_params_init(&tmp_dh_params);
if (err < 0) {
- Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
+ Log(LOG_ERR, "Failed to initialize SSL DH parameters: %s",
+ gnutls_strerror(err));
return false;
}
if (Conf_SSLOptions.DHFile) {
if (err == 0)
need_dhgenerate = false;
else
- Log(LOG_ERR, "gnutls_dh_params_init: %s", gnutls_strerror(err));
+ Log(LOG_ERR,
+ "Failed to initialize SSL DH parameters: %s",
+ gnutls_strerror(err));
memset(dhparms.data, 0, size);
free(dhparms.data);
DH_BITS);
err = gnutls_dh_params_generate2(tmp_dh_params, DH_BITS);
if (err < 0) {
- Log(LOG_ERR, "gnutls_dh_params_generate2: %s", gnutls_strerror(err));
+ Log(LOG_ERR, "Failed to generate SSL DH parameters: %s",
+ gnutls_strerror(err));
return false;
}
}
SSL_shutdown(ssl);
SSL_free(ssl);
c->ssl_state.ssl = NULL;
+ if (c->ssl_state.fingerprint) {
+ free(c->ssl_state.fingerprint);
+ c->ssl_state.fingerprint = NULL;
+ }
}
#endif
#ifdef HAVE_LIBGNUTLS
bool
ConnSSL_InitLibrary( void )
{
- if (!array_bytes(&Conf_SSLOptions.ListenPorts))
+ if (!Conf_SSLInUse()) {
+ LogDebug("SSL not in use, skipping initialization.");
return true;
+ }
#ifdef HAVE_LIBSSL
SSL_CTX *newctx;
if (!RAND_status()) {
Log(LOG_ERR, "OpenSSL PRNG not seeded: /dev/urandom missing?");
/*
- * it is probably best to fail and let the user install EGD or a similar program if no kernel random device is available.
- * According to OpenSSL RAND_egd(3): "The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7";
+ * it is probably best to fail and let the user install EGD or
+ * a similar program if no kernel random device is available.
+ * According to OpenSSL RAND_egd(3): "The automatic query of
+ * /var/run/egd-pool et al was added in OpenSSL 0.9.7";
* so it makes little sense to deal with PRNGD seeding ourselves.
*/
array_free(&Conf_SSLOptions.ListenPorts);
newctx = SSL_CTX_new(SSLv23_method());
if (!newctx) {
- LogOpenSSLError("SSL_CTX_new()", NULL);
+ LogOpenSSLError("Failed to create SSL context", NULL);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
if (!ConnSSL_LoadServerKey_openssl(newctx))
goto out;
+ if (SSL_CTX_set_cipher_list(newctx, Conf_SSLOptions.CipherList) == 0) {
+ Log(LOG_ERR, "Failed to apply OpenSSL cipher list \"%s\"!",
+ Conf_SSLOptions.CipherList);
+ goto out;
+ }
+
+ SSL_CTX_set_session_id_context(newctx, (unsigned char *)"ngircd", 6);
SSL_CTX_set_options(newctx, SSL_OP_SINGLE_DH_USE|SSL_OP_NO_SSLv2);
SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
+ SSL_CTX_set_verify(newctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
+ Verify_openssl);
SSL_CTX_free(ssl_ctx);
ssl_ctx = newctx;
Log(LOG_INFO, "%s initialized.", SSLeay_version(SSLEAY_VERSION));
#ifdef HAVE_LIBGNUTLS
int err;
static bool initialized;
- if (initialized) /* TODO: cannot reload gnutls keys: can't simply free x509 context -- it may still be in use */
+
+ if (initialized) {
+ /* TODO: cannot reload gnutls keys: can't simply free x509
+ * context -- it may still be in use */
return false;
+ }
err = gnutls_global_init();
if (err) {
- Log(LOG_ERR, "gnutls_global_init(): %s", gnutls_strerror(err));
- array_free(&Conf_SSLOptions.ListenPorts);
- return false;
+ Log(LOG_ERR, "Failed to initialize GnuTLS: %s",
+ gnutls_strerror(err));
+ goto out;
}
- if (!ConnSSL_LoadServerKey_gnutls()) {
- array_free(&Conf_SSLOptions.ListenPorts);
- return false;
+
+ if (!ConnSSL_LoadServerKey_gnutls())
+ goto out;
+
+ if (gnutls_priority_init(&priorities_cache, Conf_SSLOptions.CipherList,
+ NULL) != GNUTLS_E_SUCCESS) {
+ Log(LOG_ERR,
+ "Failed to apply GnuTLS cipher list \"%s\"!",
+ Conf_SSLOptions.CipherList);
+ goto out;
}
- Log(LOG_INFO, "gnutls %s initialized.", gnutls_check_version(NULL));
+
+ Log(LOG_INFO, "GnuTLS %s initialized.", gnutls_check_version(NULL));
initialized = true;
return true;
+out:
+ array_free(&Conf_SSLOptions.ListenPorts);
+ return false;
#endif
}
err = gnutls_certificate_allocate_credentials(&x509_cred);
if (err < 0) {
- Log(LOG_ERR, "gnutls_certificate_allocate_credentials: %s", gnutls_strerror(err));
+ Log(LOG_ERR, "Failed to allocate certificate credentials: %s",
+ gnutls_strerror(err));
return false;
}
if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
Log(LOG_WARNING,
- "Ignoring KeyFilePassword: Not supported by GNUTLS.");
+ "Ignoring SSL \"KeyFilePassword\": Not supported by GnuTLS.");
if (!Load_DH_params())
return false;
gnutls_certificate_set_dh_params(x509_cred, dh_params);
err = gnutls_certificate_set_x509_key_file(x509_cred, cert_file, Conf_SSLOptions.KeyFile, GNUTLS_X509_FMT_PEM);
if (err < 0) {
- Log(LOG_ERR, "gnutls_certificate_set_x509_key_file (cert %s, key %s): %s",
- cert_file, Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)", gnutls_strerror(err));
+ Log(LOG_ERR,
+ "Failed to set certificate key file (cert %s, key %s): %s",
+ cert_file,
+ Conf_SSLOptions.KeyFile ? Conf_SSLOptions.KeyFile : "(NULL)",
+ gnutls_strerror(err));
return false;
}
return true;
if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
- LogOpenSSLError("SSL_CTX_use_PrivateKey_file", Conf_SSLOptions.KeyFile);
+ LogOpenSSLError("Failed to add private key", Conf_SSLOptions.KeyFile);
return false;
}
cert_key = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
if (SSL_CTX_use_certificate_chain_file(ctx, cert_key) != 1) {
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
- LogOpenSSLError("SSL_CTX_use_certificate_file", cert_key);
+ LogOpenSSLError("Failed to load certificate chain", cert_key);
return false;
}
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
if (!SSL_CTX_check_private_key(ctx)) {
- LogOpenSSLError("Server Private Key does not match certificate", NULL);
+ LogOpenSSLError("Server private key does not match certificate", NULL);
return false;
}
if (Load_DH_params()) {
if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
- LogOpenSSLError("Error setting DH Parameters", Conf_SSLOptions.DHFile);
+ LogOpenSSLError("Error setting DH parameters", Conf_SSLOptions.DHFile);
/* don't return false here: the non-DH modes will still work */
DH_free(dh_params);
dh_params = NULL;
ConnSSL_Init_SSL(CONNECTION *c)
{
int ret;
+
+ LogDebug("Initializing SSL ...");
assert(c != NULL);
+
#ifdef HAVE_LIBSSL
if (!ssl_ctx) {
- Log(LOG_ERR, "Cannot init ssl_ctx: OpenSSL initialization failed at startup");
+ Log(LOG_ERR,
+ "Can't initialize SSL context, OpenSSL initialization failed at startup!");
return false;
}
assert(c->ssl_state.ssl == NULL);
+ assert(c->ssl_state.fingerprint == NULL);
c->ssl_state.ssl = SSL_new(ssl_ctx);
if (!c->ssl_state.ssl) {
- LogOpenSSLError("SSL_new()", NULL);
+ LogOpenSSLError("Failed to create SSL structure", NULL);
return false;
}
+ Conn_OPTION_ADD(c, CONN_SSL);
ret = SSL_set_fd(c->ssl_state.ssl, c->sock);
if (ret != 1) {
- LogOpenSSLError("SSL_set_fd()", NULL);
+ LogOpenSSLError("Failed to set SSL file descriptor", NULL);
ConnSSL_Free(c);
return false;
}
#endif
#ifdef HAVE_LIBGNUTLS
- ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
- if (ret < 0) {
- Log(LOG_ERR, "gnutls_set_default_priority: %s", gnutls_strerror(ret));
+ Conn_OPTION_ADD(c, CONN_SSL);
+ ret = gnutls_priority_set(c->ssl_state.gnutls_session, priorities_cache);
+ if (ret != GNUTLS_E_SUCCESS) {
+ Log(LOG_ERR, "Failed to set GnuTLS session priorities: %s",
+ gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
* There doesn't seem to be an alternate GNUTLS API we could use instead, see e.g.
* http://www.mail-archive.com/help-gnutls@gnu.org/msg00286.html
*/
- gnutls_transport_set_ptr(c->ssl_state.gnutls_session, (gnutls_transport_ptr_t) (long) c->sock);
- ret = gnutls_credentials_set(c->ssl_state.gnutls_session, GNUTLS_CRD_CERTIFICATE, x509_cred);
- if (ret < 0) {
- Log(LOG_ERR, "gnutls_credentials_set: %s", gnutls_strerror(ret));
+ gnutls_transport_set_ptr(c->ssl_state.gnutls_session,
+ (gnutls_transport_ptr_t) (long) c->sock);
+ gnutls_certificate_server_set_request(c->ssl_state.gnutls_session,
+ GNUTLS_CERT_REQUEST);
+ ret = gnutls_credentials_set(c->ssl_state.gnutls_session,
+ GNUTLS_CRD_CERTIFICATE, x509_cred);
+ if (ret != 0) {
+ Log(LOG_ERR, "Failed to set SSL credentials: %s",
+ gnutls_strerror(ret));
ConnSSL_Free(c);
return false;
}
gnutls_dh_set_prime_bits(c->ssl_state.gnutls_session, DH_BITS_MIN);
#endif
- Conn_OPTION_ADD(c, CONN_SSL);
return true;
}
err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
if (err) {
- Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
+ Log(LOG_ERR, "Failed to initialize new SSL session: %s",
+ gnutls_strerror(err));
return false;
}
#endif
}
-/*
- Check an Handle Error return code after failed calls to ssl/tls functions.
- OpenSSL:
- SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or SSL_write() on ssl.
- GNUTLS:
- gnutlsssl_read(), gnutls_write() or gnutls_handshake().
- Return: -1 on fatal error, 0 if we can try again later.
+/**
+ * Check and handle error return codes after failed calls to SSL functions.
+ *
+ * OpenSSL:
+ * SSL_connect(), SSL_accept(), SSL_do_handshake(), SSL_read(), SSL_peek(), or
+ * SSL_write() on ssl.
+ *
+ * GnuTLS:
+ * gnutlsssl_read(), gnutls_write() or gnutls_handshake().
+ *
+ * @param c The connection handle.
+ * @prarm code The return code.
+ * @param fname The name of the function in which the error occurred.
+ * @return -1 on fatal errors, 0 if we can try again later.
*/
static int
-ConnSSL_HandleError( CONNECTION *c, const int code, const char *fname )
+ConnSSL_HandleError(CONNECTION * c, const int code, const char *fname)
{
#ifdef HAVE_LIBSSL
int ret = SSL_ERROR_SYSCALL;
int real_errno = errno;
ret = SSL_get_error(c->ssl_state.ssl, code);
+
switch (ret) {
case SSL_ERROR_WANT_READ:
io_event_del(c->sock, IO_WANTWRITE);
case SSL_ERROR_NONE:
return 0; /* try again later */
case SSL_ERROR_ZERO_RETURN:
- LogDebug("TLS/SSL connection shut down normally");
+ LogDebug("SSL connection shut down normally.");
break;
- /*
- SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT, SSL_ERROR_WANT_X509_LOOKUP
- */
case SSL_ERROR_SYSCALL:
+ /* SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT,
+ * and SSL_ERROR_WANT_X509_LOOKUP */
sslerr = ERR_get_error();
if (sslerr) {
- Log( LOG_ERR, "%s: %s", fname, ERR_error_string(sslerr, NULL ));
+ Log(LOG_ERR, "SSL error: %s [in %s()]!",
+ ERR_error_string(sslerr, NULL), fname);
} else {
-
switch (code) { /* EOF that violated protocol */
case 0:
- Log(LOG_ERR, "%s: Client Disconnected", fname );
+ Log(LOG_ERR,
+ "SSL error, client disconnected [in %s()]!",
+ fname);
break;
- case -1: /* low level socket I/O error, check errno */
- Log(LOG_ERR, "%s: %s", fname, strerror(real_errno));
+ case -1: /* low level socket I/O error, check errno */
+ Log(LOG_ERR, "SSL error: %s [in %s()]!",
+ strerror(real_errno), fname);
}
}
break;
case SSL_ERROR_SSL:
- LogOpenSSLError("TLS/SSL Protocol Error", fname);
+ LogOpenSSLError("SSL protocol error", fname);
break;
default:
- Log( LOG_ERR, "%s: Unknown error %d!", fname, ret);
+ Log(LOG_ERR, "Unknown SSL error %d [in %s()]!", ret, fname);
}
ConnSSL_Free(c);
return -1;
default:
assert(code < 0);
if (gnutls_error_is_fatal(code)) {
- Log(LOG_ERR, "%s: %s", fname, gnutls_strerror(code));
+ Log(LOG_ERR, "SSL error: %s [%s].",
+ gnutls_strerror(code), fname);
ConnSSL_Free(c);
return -1;
}
#ifdef HAVE_LIBGNUTLS
int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
if (err) {
- Log(LOG_ERR, "gnutls_init: %s", gnutls_strerror(err));
+ Log(LOG_ERR, "Failed to initialize new SSL session: %s",
+ gnutls_strerror(err));
return false;
}
#endif
- LogDebug("ConnSSL_Accept: Initializing SSL data");
if (!ConnSSL_Init_SSL(c))
return -1;
}
return ConnectAccept(c, true);
}
+static int
+ConnSSL_InitCertFp( CONNECTION *c )
+{
+ const char hex[] = "0123456789abcdef";
+ int i;
+
+#ifdef HAVE_LIBSSL
+ unsigned char digest[EVP_MAX_MD_SIZE];
+ unsigned int digest_size;
+ X509 *cert;
+
+ cert = SSL_get_peer_certificate(c->ssl_state.ssl);
+ if (!cert)
+ return 0;
+
+ if (!X509_digest(cert, EVP_sha256(), digest, &digest_size)) {
+ X509_free(cert);
+ return 0;
+ }
+
+ X509_free(cert);
+#endif /* HAVE_LIBSSL */
+#ifdef HAVE_LIBGNUTLS
+ gnutls_x509_crt_t cert;
+ unsigned int cert_list_size;
+ const gnutls_datum_t *cert_list;
+ unsigned char digest[MAX_HASH_SIZE];
+ size_t digest_size;
+
+ if (gnutls_certificate_type_get(c->ssl_state.gnutls_session) !=
+ GNUTLS_CRT_X509)
+ return 0;
+
+ if (gnutls_x509_crt_init(&cert) != GNUTLS_E_SUCCESS)
+ return 0;
+
+ cert_list_size = 0;
+ cert_list = gnutls_certificate_get_peers(c->ssl_state.gnutls_session,
+ &cert_list_size);
+ if (!cert_list) {
+ gnutls_x509_crt_deinit(cert);
+ return 0;
+ }
+
+ if (gnutls_x509_crt_import(cert, &cert_list[0],
+ GNUTLS_X509_FMT_DER) != GNUTLS_E_SUCCESS) {
+ gnutls_x509_crt_deinit(cert);
+ return 0;
+ }
+
+ digest_size = sizeof(digest);
+ if (gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA256, digest,
+ &digest_size)) {
+ gnutls_x509_crt_deinit(cert);
+ return 0;
+ }
+
+ gnutls_x509_crt_deinit(cert);
+#endif /* HAVE_LIBGNUTLS */
+
+ assert(c->ssl_state.fingerprint == NULL);
+
+ c->ssl_state.fingerprint = malloc(SHA256_STRING_LEN);
+ if (!c->ssl_state.fingerprint)
+ return 0;
+
+ for (i = 0; i < (int)digest_size; i++) {
+ c->ssl_state.fingerprint[i * 2] = hex[digest[i] / 16];
+ c->ssl_state.fingerprint[i * 2 + 1] = hex[digest[i] % 16];
+ }
+ c->ssl_state.fingerprint[i * 2] = '\0';
+
+ return 1;
+}
/* accept/connect wrapper. if connect is true, connect to peer, otherwise wait for incoming connection */
static int
if (ret)
return ConnSSL_HandleError(c, ret, "gnutls_handshake");
#endif /* _GNUTLS */
+ (void)ConnSSL_InitCertFp(c);
+
Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
ConnSSL_LogCertInfo(c);
#endif
}
+char *
+ConnSSL_GetCertFp(CONNECTION *c)
+{
+ return c->ssl_state.fingerprint;
+}
+
+bool
+ConnSSL_SetCertFp(CONNECTION *c, const char *fingerprint)
+{
+ assert (c != NULL);
+ c->ssl_state.fingerprint = strndup(fingerprint, SHA256_STRING_LEN - 1);
+ return c->ssl_state.fingerprint != NULL;
+}
#else
bool
projects / ngircd-alex.git / blobdiff