#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/dh.h>
+#include <openssl/x509v3.h>
static SSL_CTX * ssl_ctx;
static DH *dh_params;
static bool ConnSSL_LoadServerKey_openssl PARAMS(( SSL_CTX *c ));
+static bool ConnSSL_SetVerifyProperties_openssl PARAMS((SSL_CTX * c));
#endif
+#define MAX_CERT_CHAIN_LENGTH 10 /* XXX: do not hardcode */
+
#ifdef HAVE_LIBGNUTLS
#include <sys/types.h>
#include <sys/stat.h>
static gnutls_dh_params_t dh_params;
static gnutls_priority_t priorities_cache = NULL;
static bool ConnSSL_LoadServerKey_gnutls PARAMS(( void ));
+static bool ConnSSL_SetVerifyProperties_gnutls PARAMS((void));
#endif
#define SHA256_STRING_LEN (32 * 2 + 1)
/**
* Log OpenSSL error message.
*
+ * @param level The log level
* @param msg The error message.
* @param info Additional information text or NULL.
*/
+static void
+LogOpenSSL_CertInfo(int level, X509 * cert, const char *msg)
+{
+ BIO *mem;
+ char *memptr;
+ long len;
+
+ assert(cert);
+ assert(msg);
+
+ if (!cert)
+ return;
+ mem = BIO_new(BIO_s_mem());
+ if (!mem)
+ return;
+ X509_NAME_print_ex(mem, X509_get_subject_name(cert), 4,
+ XN_FLAG_ONELINE);
+ X509_NAME_print_ex(mem, X509_get_issuer_name(cert), 4, XN_FLAG_ONELINE);
+ if (BIO_write(mem, "", 1) == 1) {
+ len = BIO_get_mem_data(mem, &memptr);
+ if (memptr && len > 0)
+ Log(level, "%s: \"%s\"", msg, memptr);
+ }
+ (void)BIO_set_close(mem, BIO_CLOSE);
+ BIO_free(mem);
+}
+
static void
LogOpenSSLError(const char *error, const char *info)
{
static int
-Verify_openssl(UNUSED int preverify_ok, UNUSED X509_STORE_CTX *x509_ctx)
+Verify_openssl(int preverify_ok, X509_STORE_CTX * ctx)
{
- return 1;
+ int err;
+
+ if (!preverify_ok) {
+ err = X509_STORE_CTX_get_error(ctx);
+ Log(LOG_ERR, "Certificate validation failed: %s",
+ X509_verify_cert_error_string(err));
+ }
+ return preverify_ok;
}
#endif
}
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);
+ if (!ConnSSL_SetVerifyProperties_openssl(newctx))
+ goto out;
+ SSL_CTX_set_options(newctx,
+ SSL_OP_SINGLE_DH_USE | SSL_OP_NO_SSLv2 |
+ SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 |
+ SSL_OP_NO_COMPRESSION);
SSL_CTX_set_mode(newctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_verify(newctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
Verify_openssl);
goto out;
}
+ if (!ConnSSL_SetVerifyProperties_gnutls())
+ goto out;
+
Log(LOG_INFO, "GnuTLS %s initialized.", gnutls_check_version(NULL));
initialized = true;
return true;
#ifdef HAVE_LIBGNUTLS
+static bool
+ConnSSL_SetVerifyProperties_gnutls(void)
+{
+ int err;
+
+ if (!Conf_SSLOptions.CAFile)
+ return true;
+
+ err = gnutls_certificate_set_x509_trust_file(x509_cred,
+ Conf_SSLOptions.CAFile,
+ GNUTLS_X509_FMT_PEM);
+ if (err < 0) {
+ Log(LOG_ERR, "Failed to load x509 trust file %s: %s",
+ Conf_SSLOptions.CAFile, gnutls_strerror(err));
+ return false;
+ }
+ if (Conf_SSLOptions.CRLFile) {
+ err =
+ gnutls_certificate_set_x509_crl_file(x509_cred,
+ Conf_SSLOptions.CRLFile,
+ GNUTLS_X509_FMT_PEM);
+ if (err < 0) {
+ Log(LOG_ERR, "Failed to load x509 crl file %s: %s",
+ Conf_SSLOptions.CRLFile, gnutls_strerror(err));
+ return false;
+ }
+ }
+ return true;
+}
+
+
static bool
ConnSSL_LoadServerKey_gnutls(void)
{
}
+static bool
+ConnSSL_SetVerifyProperties_openssl(SSL_CTX * ctx)
+{
+ X509_STORE *store = NULL;
+ X509_LOOKUP *lookup;
+ int verify_flags = SSL_VERIFY_PEER;
+ bool ret = false;
+
+ if (!Conf_SSLOptions.CAFile)
+ return true;
+
+ if (SSL_CTX_load_verify_locations(ctx, Conf_SSLOptions.CAFile, NULL) !=
+ 1) {
+ LogOpenSSLError("SSL_CTX_load_verify_locations", NULL);
+ goto out;
+ }
+
+ if (Conf_SSLOptions.CRLFile) {
+ X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new();
+ X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
+ SSL_CTX_set1_param(ctx, param);
+
+ store = SSL_CTX_get_cert_store(ctx);
+ assert(store);
+ lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
+ if (!lookup) {
+ LogOpenSSLError("X509_STORE_add_lookup",
+ Conf_SSLOptions.CRLFile);
+ goto out;
+ }
+
+ if (X509_load_crl_file
+ (lookup, Conf_SSLOptions.CRLFile, X509_FILETYPE_PEM) != 1) {
+ LogOpenSSLError("X509_load_crl_file",
+ Conf_SSLOptions.CRLFile);
+ goto out;
+ }
+ }
+
+ SSL_CTX_set_verify(ctx, verify_flags, Verify_openssl);
+ SSL_CTX_set_verify_depth(ctx, MAX_CERT_CHAIN_LENGTH);
+ ret = true;
+out:
+ if (Conf_SSLOptions.CRLFile)
+ free(Conf_SSLOptions.CRLFile);
+ Conf_SSLOptions.CRLFile = NULL;
+ return ret;
+}
+
+
#endif
static bool
ConnSSL_Init_SSL(CONNECTION *c)
bool
-ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
+ConnSSL_PrepareConnect(CONNECTION * c, CONF_SERVER * s)
{
bool ret;
#ifdef HAVE_LIBGNUTLS
Log(LOG_ERR, "Failed to initialize new SSL session: %s",
gnutls_strerror(err));
return false;
- }
+ }
#endif
ret = ConnSSL_Init_SSL(c);
if (!ret)
Conn_OPTION_ADD(c, CONN_SSL_CONNECT);
#ifdef HAVE_LIBSSL
assert(c->ssl_state.ssl);
- SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
+ if (s->SSLVerify) {
+ X509_VERIFY_PARAM *param = NULL;
+ param = SSL_get0_param(c->ssl_state.ssl);
+ X509_VERIFY_PARAM_set_hostflags(param,
+ X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
+Log(LOG_ERR, "DEBUG: Setting up hostname verification for '%s'", s->host);
+ int err = X509_VERIFY_PARAM_set1_host(param, s->host, 0);
+ if (err != 1) {
+ Log(LOG_ERR,
+ "Cannot set up hostname verification for '%s': %u",
+ s->host, err);
+ return false;
+ }
+ SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_PEER,
+ Verify_openssl);
+ } else
+ SSL_set_verify(c->ssl_state.ssl, SSL_VERIFY_NONE, NULL);
#endif
return true;
}
}
+#ifdef HAVE_LIBGNUTLS
+static void *
+LogMalloc(size_t s)
+{
+ void *mem = malloc(s);
+ if (!mem)
+ Log(LOG_ERR, "Out of memory: Could not allocate %lu byte",
+ (unsigned long)s);
+ return mem;
+}
+
+
static void
-ConnSSL_LogCertInfo( CONNECTION *c )
+LogGnuTLS_CertInfo(int level, gnutls_x509_crt_t cert, const char *msg)
{
+ char *dn, *issuer_dn;
+ size_t size = 0;
+ int err = gnutls_x509_crt_get_dn(cert, NULL, &size);
+ if (size == 0) {
+ Log(LOG_ERR, "gnutls_x509_crt_get_dn: size == 0");
+ return;
+ }
+ if (err && err != GNUTLS_E_SHORT_MEMORY_BUFFER)
+ goto err_crt_get;
+ dn = LogMalloc(size);
+ if (!dn)
+ return;
+ err = gnutls_x509_crt_get_dn(cert, dn, &size);
+ if (err)
+ goto err_crt_get;
+ gnutls_x509_crt_get_issuer_dn(cert, NULL, &size);
+ assert(size);
+ issuer_dn = LogMalloc(size);
+ if (!issuer_dn) {
+ Log(level, "%s: Distinguished Name: %s", msg, dn);
+ free(dn);
+ return;
+ }
+ gnutls_x509_crt_get_issuer_dn(cert, issuer_dn, &size);
+ Log(level, "%s: Distinguished Name: \"%s\", Issuer \"%s\"", msg, dn,
+ issuer_dn);
+ free(dn);
+ free(issuer_dn);
+ return;
+
+ err_crt_get:
+ Log(LOG_ERR, "gnutls_x509_crt_get_dn: %s", gnutls_strerror(err));
+ return;
+}
+#endif
+
+
+static void
+ConnSSL_LogCertInfo( CONNECTION * c, bool connect)
+{
+ bool cert_seen = false, cert_ok = false;
+ char msg[128];
#ifdef HAVE_LIBSSL
+ const char *comp_alg = "no compression";
+ const void *comp;
+ X509 *peer_cert = NULL;
SSL *ssl = c->ssl_state.ssl;
assert(ssl);
- Log(LOG_INFO, "Connection %d: initialized %s using cipher %s.",
- c->sock, SSL_get_version(ssl), SSL_get_cipher(ssl));
+ comp = SSL_get_current_compression(ssl);
+ if (comp)
+ comp_alg = SSL_COMP_get_name(comp);
+ Log(LOG_INFO, "Connection %d: initialized %s using cipher %s, %s.",
+ c->sock, SSL_get_version(ssl), SSL_get_cipher(ssl), comp_alg);
+ peer_cert = SSL_get_peer_certificate(ssl);
+ if (peer_cert && connect) {
+ cert_seen = true;
+ /* Client: Check server certificate */
+ int err = SSL_get_verify_result(ssl);
+ if (err == X509_V_OK) {
+ const char *peername = SSL_get0_peername(ssl);
+ if (peername != NULL)
+ cert_ok = true;
+
+ Log(LOG_ERR, "X509_V_OK, peername = '%s'", peername);
+
+ } else
+ Log(LOG_ERR, "Certificate validation failed: %s",
+ X509_verify_cert_error_string(err));
+ snprintf(msg, sizeof(msg), "%svalid peer certificate",
+ cert_ok ? "" : "in");
+ LogOpenSSL_CertInfo(cert_ok ? LOG_DEBUG : LOG_ERR, peer_cert,
+ msg);
+
+ X509_free(peer_cert);
+ }
#endif
#ifdef HAVE_LIBGNUTLS
+ unsigned int status;
+ gnutls_credentials_type_t cred;
gnutls_session_t sess = c->ssl_state.gnutls_session;
gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
gnutls_cipher_get_name(cipher),
gnutls_mac_get_name(gnutls_mac_get(sess)));
+ cred = gnutls_auth_get_type(c->ssl_state.gnutls_session);
+ if (cred == GNUTLS_CRD_CERTIFICATE && connect) {
+ cert_seen = true;
+ int verify =
+ gnutls_certificate_verify_peers2(c->
+ ssl_state.gnutls_session,
+ &status);
+Log(LOG_ERR, "DEBUG: verify = %d", verify);
+ if (verify < 0) {
+ Log(LOG_ERR,
+ "gnutls_certificate_verify_peers2 failed: %s",
+ gnutls_strerror(verify));
+ goto done_cn_validation;
+ } else if (status) {
+ gnutls_datum_t out;
+
+ if (gnutls_certificate_verification_status_print
+ (status, gnutls_certificate_type_get(sess), &out,
+ 0) == GNUTLS_E_SUCCESS) {
+ Log(LOG_ERR,
+ "Certificate validation failed: %s",
+ out.data);
+ gnutls_free(out.data);
+ }
+ }
+Log(LOG_ERR, "DEBUG: status = %d", status);
+
+ gnutls_x509_crt_t cert;
+ unsigned cert_list_size;
+ const gnutls_datum_t *cert_list =
+ gnutls_certificate_get_peers(sess, &cert_list_size);
+ if (!cert_list || cert_list_size == 0) {
+ Log(LOG_ERR, "No certificates found");
+ goto done_cn_validation;
+ }
+ int err = gnutls_x509_crt_init(&cert);
+ if (err < 0) {
+ Log(LOG_ERR,
+ "Failed to initialize x509 certificate: %s",
+ gnutls_strerror(err));
+ goto done_cn_validation;
+ }
+ err = gnutls_x509_crt_import(cert, cert_list,
+ GNUTLS_X509_FMT_DER);
+ if (err < 0) {
+ Log(LOG_ERR, "Failed to parse the certificate: %s",
+ gnutls_strerror(err));
+ goto done_cn_validation;
+ }
+ err = gnutls_x509_crt_check_hostname(cert, c->host);
+ if (err == 0)
+ Log(LOG_ERR,
+ "Failed to verify the hostname, expected \"%s\"",
+ c->host);
+ else
+ cert_ok = verify == 0 && status == 0;
+
+ snprintf(msg, sizeof(msg), "%svalid peer certificate",
+ cert_ok ? "" : "in");
+ LogGnuTLS_CertInfo(cert_ok ? LOG_DEBUG : LOG_ERR, cert, msg);
+
+ gnutls_x509_crt_deinit(cert);
+done_cn_validation:
+ ;
+ }
#endif
+ /*
+ * can be used later to check if connection was authenticated, e.g.
+ * if inbound connection tries to register itself as server.
+ * Could also restrict /OPER to authenticated connections, etc.
+ */
+ if (cert_ok)
+ Conn_OPTION_ADD(c, CONN_SSL_PEERCERT_OK);
+ if (!cert_seen)
+ Log(LOG_INFO, "Peer did not present a certificate");
}
(void)ConnSSL_InitCertFp(c);
Conn_OPTION_DEL(c, (CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ|CONN_SSL_CONNECT));
- ConnSSL_LogCertInfo(c);
+ ConnSSL_LogCertInfo(c, connect);
Conn_StartLogin(CONNECTION2ID(c));
return 1;
projects / ngircd-alex.git / blobdiff