/*
* ngIRCd -- The Next Generation IRC Daemon
* 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"
/**
* @file
* SSL wrapper functions
*/
#include "conf-ssl.h"
#ifdef SSL_SUPPORT
#include "io.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#define CONN_MODULE
#include "conn.h"
#include "conf.h"
#include "conn-func.h"
#include "conn-ssl.h"
#include "log.h"
#include "defines.h"
extern struct SSLOptions Conf_SSLOptions;
#ifdef HAVE_LIBSSL
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/dh.h>
static SSL_CTX * ssl_ctx;
static DH *dh_params;
static bool ConnSSL_LoadServerKey_openssl PARAMS(( SSL_CTX *c ));
#endif
#ifdef HAVE_LIBGNUTLS
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <gnutls/x509.h>
#define DH_BITS 2048
#define DH_BITS_MIN 1024
#define MAX_HASH_SIZE 64 /* from gnutls-int.h */
typedef struct {
int refcnt;
gnutls_certificate_credentials_t x509_cred;
gnutls_dh_params_t dh_params;
} x509_cred_slot;
static array x509_creds = INIT_ARRAY;
static size_t x509_cred_idx;
static gnutls_dh_params_t dh_params;
static gnutls_priority_t priorities_cache = NULL;
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_LIBGNUTLS
static char * openreadclose(const char *name, size_t *len)
{
char *buf = NULL;
struct stat s;
ssize_t br;
int fd = open(name, O_RDONLY);
if (fd < 0) {
Log(LOG_ERR, "Could not open %s: %s", name, strerror(errno));
return NULL;
}
if (fstat(fd, &s)) {
Log(LOG_ERR, "Could not fstat %s: %s", name, strerror(errno));
goto out;
}
if (!S_ISREG(s.st_mode)) {
Log(LOG_ERR, "%s: Not a regular file", name);
goto out;
}
if (s.st_size <= 0) {
Log(LOG_ERR, "%s: invalid file length (size %ld <= 0)", name, (long) s.st_size);
goto out;
}
buf = malloc(s.st_size);
if (!buf) {
Log(LOG_ERR, "Could not malloc %lu bytes for file %s: %s", s.st_size, name, strerror(errno));
goto out;
}
br = read(fd, buf, s.st_size);
if (br != (ssize_t)s.st_size) {
Log(LOG_ERR, "Could not read file %s: read returned %ld, expected %ld: %s",
name, (long) br, (long) s.st_size, br == -1 ? strerror(errno):"short read?!");
memset(buf, 0, s.st_size);
free(buf);
buf = NULL;
} else {
*len = br;
}
out:
close(fd);
return buf;
}
#endif
#ifdef HAVE_LIBSSL
/**
* Log OpenSSL error message.
*
* @param msg The error message.
* @param info Additional information text or NULL.
*/
static void
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";
assert(error != NULL);
if (info)
Log(LOG_ERR, "%s: %s (%s)", error, info, errmsg);
else
Log(LOG_ERR, "%s: %s", error, errmsg);
}
static int
pem_passwd_cb(char *buf, int size, int rwflag, void *password)
{
array *pass = password;
int passlen;
(void)rwflag; /* rwflag is unused if DEBUG is not set. */
assert(rwflag == 0); /* 0 -> callback used for decryption.
* See SSL_CTX_set_default_passwd_cb(3) */
passlen = (int) array_bytes(pass);
LogDebug("pem_passwd_cb buf size %d, array size %d", size, passlen);
assert(passlen >= 0);
if (passlen <= 0) {
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
static bool
Load_DH_params(void)
{
#ifdef HAVE_LIBSSL
FILE *fp;
bool ret = true;
if (!Conf_SSLOptions.DHFile) {
Log(LOG_NOTICE, "Configuration option \"DHFile\" not set!");
return false;
}
fp = fopen(Conf_SSLOptions.DHFile, "r");
if (!fp) {
Log(LOG_ERR, "%s: %s", Conf_SSLOptions.DHFile, strerror(errno));
return false;
}
dh_params = PEM_read_DHparams(fp, NULL, NULL, NULL);
if (!dh_params) {
Log(LOG_ERR, "%s: Failed to read SSL DH parameters!",
Conf_SSLOptions.DHFile);
ret = false;
}
fclose(fp);
return ret;
#endif
#ifdef HAVE_LIBGNUTLS
bool need_dhgenerate = true;
int err;
gnutls_dh_params_t tmp_dh_params;
err = gnutls_dh_params_init(&tmp_dh_params);
if (err < 0) {
Log(LOG_ERR, "Failed to initialize SSL DH parameters: %s",
gnutls_strerror(err));
return false;
}
if (Conf_SSLOptions.DHFile) {
gnutls_datum_t dhparms;
size_t size;
dhparms.data = (unsigned char *) openreadclose(Conf_SSLOptions.DHFile, &size);
if (dhparms.data) {
dhparms.size = size;
err = gnutls_dh_params_import_pkcs3(tmp_dh_params, &dhparms, GNUTLS_X509_FMT_PEM);
if (err == 0)
need_dhgenerate = false;
else
Log(LOG_ERR,
"Failed to initialize SSL DH parameters: %s",
gnutls_strerror(err));
memset(dhparms.data, 0, size);
free(dhparms.data);
}
}
if (need_dhgenerate) {
Log(LOG_WARNING,
"DHFile not set, generating %u bit DH parameters. This may take a while ...",
DH_BITS);
err = gnutls_dh_params_generate2(tmp_dh_params, DH_BITS);
if (err < 0) {
Log(LOG_ERR, "Failed to generate SSL DH parameters: %s",
gnutls_strerror(err));
return false;
}
}
dh_params = tmp_dh_params;
return true;
#endif
}
void ConnSSL_Free(CONNECTION *c)
{
#ifdef HAVE_LIBSSL
SSL *ssl = c->ssl_state.ssl;
if (ssl) {
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
gnutls_session_t sess = c->ssl_state.gnutls_session;
if (Conn_OPTION_ISSET(c, CONN_SSL)) {
gnutls_bye(sess, GNUTLS_SHUT_RDWR);
gnutls_deinit(sess);
}
x509_cred_slot *slot = array_get(&x509_creds, sizeof(x509_cred_slot), c->ssl_state.x509_cred_idx);
assert(slot != NULL);
assert(slot->refcnt > 0);
assert(slot->x509_cred != NULL);
slot->refcnt--;
if ((c->ssl_state.x509_cred_idx != x509_cred_idx) && (slot->refcnt <= 0)) {
Log(LOG_INFO, "Discarding X509 certificate credentials from slot %zd.",
c->ssl_state.x509_cred_idx);
gnutls_certificate_free_keys(slot->x509_cred);
gnutls_certificate_free_credentials(slot->x509_cred);
slot->x509_cred = NULL;
gnutls_dh_params_deinit(slot->dh_params);
slot->dh_params = NULL;
slot->refcnt = 0;
}
#endif
assert(Conn_OPTION_ISSET(c, CONN_SSL));
/* can't just set bitmask to 0 -- there are other, non-ssl related flags, e.g. CONN_ZIP. */
Conn_OPTION_DEL(c, CONN_SSL_FLAGS_ALL);
}
bool
ConnSSL_InitLibrary( void )
{
if (!Conf_SSLInUse()) {
LogDebug("SSL not in use, skipping initialization.");
return true;
}
#ifdef HAVE_LIBSSL
SSL_CTX *newctx;
#if OPENSSL_API_COMPAT < 0x10100000L
if (!ssl_ctx) {
SSL_library_init();
SSL_load_error_strings();
}
#endif
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";
* so it makes little sense to deal with PRNGD seeding ourselves.
*/
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
newctx = SSL_CTX_new(SSLv23_method());
if (!newctx) {
LogOpenSSLError("Failed to create SSL context", NULL);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
if (!ConnSSL_LoadServerKey_openssl(newctx)) {
/* Failed to read new key but an old ssl context
* already exists -> reuse old context */
if (ssl_ctx) {
SSL_CTX_free(newctx);
Log(LOG_WARNING,
"Re-Initializing of SSL failed, using old keys!");
return true;
}
/* No preexisting old context -> error. */
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.", OpenSSL_version(OPENSSL_VERSION));
return true;
out:
SSL_CTX_free(newctx);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
#endif
#ifdef HAVE_LIBGNUTLS
int err;
static bool initialized;
if (!initialized) {
err = gnutls_global_init();
if (err) {
Log(LOG_ERR, "Failed to initialize GnuTLS: %s",
gnutls_strerror(err));
goto out;
}
}
if (!ConnSSL_LoadServerKey_gnutls())
goto out;
if (priorities_cache != NULL) {
gnutls_priority_deinit(priorities_cache);
}
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));
initialized = true;
return true;
out:
array_free(&Conf_SSLOptions.ListenPorts);
return false;
#endif
}
#ifdef HAVE_LIBGNUTLS
static bool
ConnSSL_LoadServerKey_gnutls(void)
{
int err;
const char *cert_file;
x509_cred_slot *slot = NULL;
gnutls_certificate_credentials_t x509_cred;
err = gnutls_certificate_allocate_credentials(&x509_cred);
if (err < 0) {
Log(LOG_ERR, "Failed to allocate certificate credentials: %s",
gnutls_strerror(err));
return false;
}
cert_file = Conf_SSLOptions.CertFile ? Conf_SSLOptions.CertFile:Conf_SSLOptions.KeyFile;
if (!cert_file) {
Log(LOG_ERR, "No SSL server key configured!");
return false;
}
if (array_bytes(&Conf_SSLOptions.KeyFilePassword))
Log(LOG_WARNING,
"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,
"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;
}
/* Free currently active x509 context (if any) unless it is still in use */
slot = array_get(&x509_creds, sizeof(x509_cred_slot), x509_cred_idx);
if ((slot != NULL) && (slot->refcnt <= 0) && (slot->x509_cred != NULL)) {
Log(LOG_INFO, "Discarding X509 certificate credentials from slot %zd.", x509_cred_idx);
gnutls_certificate_free_keys(slot->x509_cred);
gnutls_certificate_free_credentials(slot->x509_cred);
slot->x509_cred = NULL;
gnutls_dh_params_deinit(slot->dh_params);
slot->dh_params = NULL;
slot->refcnt = 0;
}
/* Find free slot */
x509_cred_idx = (size_t) -1;
size_t i;
for (slot = array_start(&x509_creds), i = 0;
i < array_length(&x509_creds, sizeof(x509_cred_slot));
slot++, i++) {
if (slot->refcnt <= 0) {
x509_cred_idx = i;
break;
}
}
/* ... allocate new slot otherwise. */
if (x509_cred_idx == (size_t) -1) {
x509_cred_idx = array_length(&x509_creds, sizeof(x509_cred_slot));
slot = array_alloc(&x509_creds, sizeof(x509_cred_slot), x509_cred_idx);
if (slot == NULL) {
Log(LOG_ERR, "Failed to allocate new slot for certificate credentials");
return false;
}
}
Log(LOG_INFO, "Storing new X509 certificate credentials in slot %zd.", x509_cred_idx);
slot->x509_cred = x509_cred;
slot->refcnt = 0;
return true;
}
#endif
#ifdef HAVE_LIBSSL
static bool
ConnSSL_LoadServerKey_openssl(SSL_CTX *ctx)
{
char *cert_key;
assert(ctx);
if (!Conf_SSLOptions.KeyFile) {
Log(LOG_ERR, "No SSL server key configured!");
return false;
}
SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
SSL_CTX_set_default_passwd_cb_userdata(ctx, &Conf_SSLOptions.KeyFilePassword);
if (SSL_CTX_use_PrivateKey_file(ctx, Conf_SSLOptions.KeyFile, SSL_FILETYPE_PEM) != 1) {
array_free_wipe(&Conf_SSLOptions.KeyFilePassword);
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("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);
return false;
}
if (Load_DH_params()) {
if (SSL_CTX_set_tmp_dh(ctx, dh_params) != 1)
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;
}
return true;
}
#endif
static bool
ConnSSL_Init_SSL(CONNECTION *c)
{
int ret;
LogDebug("Initializing SSL ...");
assert(c != NULL);
#ifdef HAVE_LIBSSL
if (!ssl_ctx) {
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("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("Failed to set SSL file descriptor", NULL);
ConnSSL_Free(c);
return false;
}
#endif
#ifdef HAVE_LIBGNUTLS
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;
}
/*
* The intermediate (long) cast is here to avoid a warning like:
* "cast to pointer from integer of different size" on 64-bit platforms.
* 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);
gnutls_certificate_server_set_request(c->ssl_state.gnutls_session,
GNUTLS_CERT_REQUEST);
Log(LOG_INFO, "Using X509 credentials from slot %zd", x509_cred_idx);
c->ssl_state.x509_cred_idx = x509_cred_idx;
x509_cred_slot *slot = array_get(&x509_creds, sizeof(x509_cred_slot), x509_cred_idx);
slot->refcnt++;
ret = gnutls_credentials_set(c->ssl_state.gnutls_session,
GNUTLS_CRD_CERTIFICATE, slot->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
return true;
}
bool
ConnSSL_PrepareConnect(CONNECTION *c, UNUSED CONF_SERVER *s)
{
bool ret;
#ifdef HAVE_LIBGNUTLS
int err;
err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_CLIENT);
if (err) {
Log(LOG_ERR, "Failed to initialize new SSL session: %s",
gnutls_strerror(err));
return false;
}
#endif
ret = ConnSSL_Init_SSL(c);
if (!ret)
return false;
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);
#endif
return true;
}
/**
* 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)
{
#ifdef HAVE_LIBSSL
int ret = SSL_ERROR_SYSCALL;
unsigned long sslerr;
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);
Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
return 0; /* try again later */
case SSL_ERROR_WANT_WRITE:
io_event_del(c->sock, IO_WANTREAD);
Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE); /* fall through */
case SSL_ERROR_NONE:
return 0; /* try again later */
case SSL_ERROR_ZERO_RETURN:
LogDebug("SSL connection shut down normally.");
break;
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, "SSL error: %s [in %s()]!",
ERR_error_string(sslerr, NULL), fname);
} else {
switch (code) { /* EOF that violated protocol */
case 0:
Log(LOG_ERR,
"SSL error, client disconnected [in %s()]!",
fname);
break;
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("SSL protocol error", fname);
break;
default:
Log(LOG_ERR, "Unknown SSL error %d [in %s()]!", ret, fname);
}
ConnSSL_Free(c);
return -1;
#endif
#ifdef HAVE_LIBGNUTLS
switch (code) {
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
if (gnutls_record_get_direction(c->ssl_state.gnutls_session)) {
Conn_OPTION_ADD(c, CONN_SSL_WANT_WRITE);
io_event_del(c->sock, IO_WANTREAD);
} else {
Conn_OPTION_ADD(c, CONN_SSL_WANT_READ);
io_event_del(c->sock, IO_WANTWRITE);
}
break;
default:
assert(code < 0);
if (gnutls_error_is_fatal(code)) {
Log(LOG_ERR, "SSL error: %s [%s].",
gnutls_strerror(code), fname);
ConnSSL_Free(c);
return -1;
}
}
return 0;
#endif
}
static void
ConnSSL_LogCertInfo( CONNECTION *c )
{
#ifdef HAVE_LIBSSL
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));
#endif
#ifdef HAVE_LIBGNUTLS
gnutls_session_t sess = c->ssl_state.gnutls_session;
gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
Log(LOG_INFO, "Connection %d: initialized %s using cipher %s-%s.",
c->sock,
gnutls_protocol_get_name(gnutls_protocol_get_version(sess)),
gnutls_cipher_get_name(cipher),
gnutls_mac_get_name(gnutls_mac_get(sess)));
#endif
}
/*
Accept incoming SSL connection.
Return Values:
1: SSL Connection established
0: try again
-1: SSL Connection not established due to fatal error.
*/
int
ConnSSL_Accept( CONNECTION *c )
{
assert(c != NULL);
if (!Conn_OPTION_ISSET(c, CONN_SSL)) {
#ifdef HAVE_LIBGNUTLS
int err = gnutls_init(&c->ssl_state.gnutls_session, GNUTLS_SERVER);
if (err) {
Log(LOG_ERR, "Failed to initialize new SSL session: %s",
gnutls_strerror(err));
return false;
}
#endif
if (!ConnSSL_Init_SSL(c))
return -1;
}
return ConnectAccept(c, false );
}
int
ConnSSL_Connect( CONNECTION *c )
{
assert(c != NULL);
#ifdef HAVE_LIBSSL
assert(c->ssl_state.ssl);
#endif
assert(Conn_OPTION_ISSET(c, CONN_SSL));
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
ConnectAccept( CONNECTION *c, bool connect)
{
int ret;
#ifdef HAVE_LIBSSL
SSL *ssl = c->ssl_state.ssl;
assert(ssl != NULL);
ret = connect ? SSL_connect(ssl) : SSL_accept(ssl);
if (1 != ret)
return ConnSSL_HandleError(c, ret, connect ? "SSL_connect": "SSL_accept");
#endif
#ifdef HAVE_LIBGNUTLS
(void) connect;
ret = gnutls_handshake(c->ssl_state.gnutls_session);
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);
Conn_StartLogin(CONNECTION2ID(c));
return 1;
}
ssize_t
ConnSSL_Write(CONNECTION *c, const void *buf, size_t count)
{
ssize_t bw;
Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
assert(count > 0);
#ifdef HAVE_LIBSSL
bw = (ssize_t) SSL_write(c->ssl_state.ssl, buf, count);
#endif
#ifdef HAVE_LIBGNUTLS
bw = gnutls_write(c->ssl_state.gnutls_session, buf, count);
#endif
if (bw > 0)
return bw;
if (ConnSSL_HandleError( c, bw, "ConnSSL_Write") == 0)
errno = EAGAIN; /* try again */
return -1;
}
ssize_t
ConnSSL_Read(CONNECTION *c, void * buf, size_t count)
{
ssize_t br;
Conn_OPTION_DEL(c, CONN_SSL_WANT_WRITE|CONN_SSL_WANT_READ);
#ifdef HAVE_LIBSSL
br = (ssize_t) SSL_read(c->ssl_state.ssl, buf, count);
if (br > 0) /* on EOF we have to call ConnSSL_HandleError(), see SSL_read(3) */
return br;
#endif
#ifdef HAVE_LIBGNUTLS
br = gnutls_read(c->ssl_state.gnutls_session, buf, count);
if (br >= 0) /* on EOF we must _not_ call ConnSSL_HandleError, see gnutls_record_recv(3) */
return br;
#endif
/* error on read: switch ConnSSL_HandleError() return values -> 0 is "try again", so return -1 and set EAGAIN */
if (ConnSSL_HandleError(c, br, "ConnSSL_Read") == 0) {
errno = EAGAIN;
return -1;
}
return 0;
}
bool
ConnSSL_GetCipherInfo(CONNECTION *c, char *buf, size_t len)
{
#ifdef HAVE_LIBSSL
char *nl;
SSL *ssl = c->ssl_state.ssl;
if (!ssl)
return false;
*buf = 0;
SSL_CIPHER_description(SSL_get_current_cipher(ssl), buf, len);
nl = strchr(buf, '\n');
if (nl)
*nl = 0;
return true;
#endif
#ifdef HAVE_LIBGNUTLS
if (Conn_OPTION_ISSET(c, CONN_SSL)) {
const char *name_cipher, *name_mac, *name_proto, *name_keyexchange;
unsigned keysize;
gnutls_session_t sess = c->ssl_state.gnutls_session;
gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(sess);
name_cipher = gnutls_cipher_get_name(cipher);
name_mac = gnutls_mac_get_name(gnutls_mac_get(sess));
keysize = gnutls_cipher_get_key_size(cipher) * 8;
name_proto = gnutls_protocol_get_name(gnutls_protocol_get_version(sess));
name_keyexchange = gnutls_kx_get_name(gnutls_kx_get(sess));
return snprintf(buf, len, "%s-%s%15s Kx=%s Enc=%s(%u) Mac=%s",
name_cipher, name_mac, name_proto, name_keyexchange, name_cipher, keysize, name_mac) > 0;
}
return false;
#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
ConnSSL_InitLibrary(void)
{
return true;
}
#endif /* SSL_SUPPORT */
/* -eof- */
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