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angiosperm/librb/src/openssl.c

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/*
* librb: a library used by ircd-ratbox and other things
* openssl.c: OpenSSL backend
*
* Copyright (C) 2007-2008 ircd-ratbox development team
* Copyright (C) 2007-2008 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2015-2016 Aaron Jones <aaronmdjones@gmail.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*
*/
#include <librb_config.h>
#include <rb_lib.h>
#ifdef HAVE_OPENSSL
#include <commio-int.h>
#include <commio-ssl.h>
#include "openssl_ratbox.h"
typedef enum
{
RB_FD_TLS_DIRECTION_IN = 0,
RB_FD_TLS_DIRECTION_OUT = 1
} rb_fd_tls_direction;
#define SSL_P(x) ((SSL *)((x)->ssl))
static SSL_CTX *ssl_ctx = NULL;
struct ssl_connect
{
CNCB *callback;
void *data;
int timeout;
};
static const char *rb_ssl_strerror(unsigned long);
static void rb_ssl_connect_realcb(rb_fde_t *, int, struct ssl_connect *);
/*
* Internal OpenSSL-specific code
*/
static unsigned long
rb_ssl_last_err(void)
{
unsigned long err_saved, err = 0;
while((err_saved = ERR_get_error()) != 0)
err = err_saved;
return err;
}
static void
rb_ssl_init_fd(rb_fde_t *const F, const rb_fd_tls_direction dir)
{
(void) rb_ssl_last_err();
F->ssl = SSL_new(ssl_ctx);
if(F->ssl == NULL)
{
rb_lib_log("%s: SSL_new: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
rb_close(F);
return;
}
switch(dir)
{
case RB_FD_TLS_DIRECTION_IN:
SSL_set_accept_state(SSL_P(F));
break;
case RB_FD_TLS_DIRECTION_OUT:
SSL_set_connect_state(SSL_P(F));
break;
}
SSL_set_fd(SSL_P(F), rb_get_fd(F));
}
static void
rb_ssl_accept_common(rb_fde_t *const F, void *const data __attribute__((unused)))
{
lrb_assert(F != NULL);
lrb_assert(F->accept != NULL);
lrb_assert(F->accept->callback != NULL);
lrb_assert(F->ssl != NULL);
(void) rb_ssl_last_err();
int ret = SSL_do_handshake(SSL_P(F));
int err = SSL_get_error(SSL_P(F), ret);
if(ret == 1)
{
F->handshake_count++;
rb_settimeout(F, 0, NULL, NULL);
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, NULL, NULL);
struct acceptdata *const ad = F->accept;
F->accept = NULL;
ad->callback(F, RB_OK, (struct sockaddr *)&ad->S, ad->addrlen, ad->data);
rb_free(ad);
return;
}
if(ret == -1 && err == SSL_ERROR_WANT_READ)
{
rb_setselect(F, RB_SELECT_READ, rb_ssl_accept_common, NULL);
return;
}
if(ret == -1 && err == SSL_ERROR_WANT_WRITE)
{
rb_setselect(F, RB_SELECT_WRITE, rb_ssl_accept_common, NULL);
return;
}
errno = EIO;
F->ssl_errno = (unsigned long) err;
F->accept->callback(F, RB_ERROR_SSL, NULL, 0, F->accept->data);
}
static void
rb_ssl_connect_common(rb_fde_t *const F, void *const data)
{
lrb_assert(F != NULL);
lrb_assert(F->ssl != NULL);
(void) rb_ssl_last_err();
int ret = SSL_do_handshake(SSL_P(F));
int err = SSL_get_error(SSL_P(F), ret);
if(ret == 1)
{
F->handshake_count++;
rb_settimeout(F, 0, NULL, NULL);
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, NULL, NULL);
rb_ssl_connect_realcb(F, RB_OK, data);
return;
}
if(ret == -1 && err == SSL_ERROR_WANT_READ)
{
rb_setselect(F, RB_SELECT_READ, rb_ssl_connect_common, data);
return;
}
if(ret == -1 && err == SSL_ERROR_WANT_WRITE)
{
rb_setselect(F, RB_SELECT_WRITE, rb_ssl_connect_common, data);
return;
}
errno = EIO;
F->ssl_errno = (unsigned long) err;
rb_ssl_connect_realcb(F, RB_ERROR_SSL, data);
}
static const char *
rb_ssl_strerror(const unsigned long err)
{
static char errbuf[512];
ERR_error_string_n(err, errbuf, sizeof errbuf);
return errbuf;
}
static int
verify_accept_all_cb(const int preverify_ok __attribute__((unused)), X509_STORE_CTX *const x509_ctx __attribute__((unused)))
{
return 1;
}
static ssize_t
rb_ssl_read_or_write(const int r_or_w, rb_fde_t *const F, void *const rbuf, const void *const wbuf, const size_t count)
{
ssize_t ret;
unsigned long err;
(void) rb_ssl_last_err();
if(r_or_w == 0)
ret = (ssize_t) SSL_read(SSL_P(F), rbuf, (int)count);
else
ret = (ssize_t) SSL_write(SSL_P(F), wbuf, (int)count);
if(ret < 0)
{
switch(SSL_get_error(SSL_P(F), ret))
{
case SSL_ERROR_WANT_READ:
errno = EAGAIN;
return RB_RW_SSL_NEED_READ;
case SSL_ERROR_WANT_WRITE:
errno = EAGAIN;
return RB_RW_SSL_NEED_WRITE;
case SSL_ERROR_ZERO_RETURN:
return 0;
case SSL_ERROR_SYSCALL:
err = rb_ssl_last_err();
if(err == 0)
{
F->ssl_errno = 0;
return RB_RW_IO_ERROR;
}
break;
default:
err = rb_ssl_last_err();
break;
}
F->ssl_errno = err;
if(err > 0)
{
errno = EIO; /* not great but... */
return RB_RW_SSL_ERROR;
}
return RB_RW_IO_ERROR;
}
return ret;
}
static int
make_certfp(X509 *const cert, uint8_t certfp[const RB_SSL_CERTFP_LEN], const int method)
{
unsigned int hashlen = 0;
const EVP_MD *md_type = NULL;
const ASN1_ITEM *item = NULL;
void *data = NULL;
switch(method)
{
case RB_SSL_CERTFP_METH_CERT_SHA1:
hashlen = RB_SSL_CERTFP_LEN_SHA1;
md_type = EVP_sha1();
item = ASN1_ITEM_rptr(X509);
data = cert;
break;
case RB_SSL_CERTFP_METH_CERT_SHA256:
hashlen = RB_SSL_CERTFP_LEN_SHA256;
md_type = EVP_sha256();
item = ASN1_ITEM_rptr(X509);
data = cert;
break;
case RB_SSL_CERTFP_METH_CERT_SHA512:
hashlen = RB_SSL_CERTFP_LEN_SHA512;
md_type = EVP_sha512();
item = ASN1_ITEM_rptr(X509);
data = cert;
break;
case RB_SSL_CERTFP_METH_SPKI_SHA256:
hashlen = RB_SSL_CERTFP_LEN_SHA256;
md_type = EVP_sha256();
item = ASN1_ITEM_rptr(X509_PUBKEY);
data = X509_get_X509_PUBKEY(cert);
break;
case RB_SSL_CERTFP_METH_SPKI_SHA512:
hashlen = RB_SSL_CERTFP_LEN_SHA512;
md_type = EVP_sha512();
item = ASN1_ITEM_rptr(X509_PUBKEY);
data = X509_get_X509_PUBKEY(cert);
break;
default:
return 0;
}
if(ASN1_item_digest(item, md_type, data, certfp, &hashlen) != 1)
{
rb_lib_log("%s: ASN1_item_digest: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
return 0;
}
return (int) hashlen;
}
/*
* External OpenSSL-specific code
*/
void
rb_ssl_shutdown(rb_fde_t *const F)
{
if(F == NULL || F->ssl == NULL)
return;
(void) rb_ssl_last_err();
for(int i = 0; i < 4; i++)
{
int ret = SSL_shutdown(SSL_P(F));
int err = SSL_get_error(SSL_P(F), ret);
if(ret >= 0 || (err != SSL_ERROR_WANT_READ && err != SSL_ERROR_WANT_WRITE))
break;
}
SSL_free(SSL_P(F));
F->ssl = NULL;
}
int
rb_init_ssl(void)
{
#ifndef LRB_SSL_NO_EXPLICIT_INIT
(void) SSL_library_init();
SSL_load_error_strings();
#endif
rb_lib_log("%s: OpenSSL backend initialised", __func__);
return 1;
}
int
rb_setup_ssl_server(const char *const certfile, const char *keyfile,
const char *const dhfile, const char *cipherlist)
{
if(certfile == NULL)
{
rb_lib_log("%s: no certificate file specified", __func__);
return 0;
}
if(keyfile == NULL)
keyfile = certfile;
if(cipherlist == NULL)
cipherlist = rb_default_ciphers;
(void) rb_ssl_last_err();
#ifdef LRB_HAVE_TLS_METHOD_API
SSL_CTX *const ssl_ctx_new = SSL_CTX_new(TLS_method());
#else
SSL_CTX *const ssl_ctx_new = SSL_CTX_new(SSLv23_method());
#endif
if(ssl_ctx_new == NULL)
{
rb_lib_log("%s: SSL_CTX_new: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
return 0;
}
if(SSL_CTX_use_certificate_chain_file(ssl_ctx_new, certfile) != 1)
{
rb_lib_log("%s: SSL_CTX_use_certificate_chain_file ('%s'): %s", __func__, certfile,
rb_ssl_strerror(rb_ssl_last_err()));
SSL_CTX_free(ssl_ctx_new);
return 0;
}
if(SSL_CTX_use_PrivateKey_file(ssl_ctx_new, keyfile, SSL_FILETYPE_PEM) != 1)
{
rb_lib_log("%s: SSL_CTX_use_PrivateKey_file ('%s'): %s", __func__, keyfile,
rb_ssl_strerror(rb_ssl_last_err()));
SSL_CTX_free(ssl_ctx_new);
return 0;
}
if(dhfile == NULL)
{
rb_lib_log("%s: no DH parameters file specified", __func__);
}
else
{
FILE *const dhf = fopen(dhfile, "r");
DH *dhp = NULL;
if(dhf == NULL)
{
rb_lib_log("%s: fopen ('%s'): %s", __func__, dhfile, strerror(errno));
}
else if(PEM_read_DHparams(dhf, &dhp, NULL, NULL) == NULL)
{
rb_lib_log("%s: PEM_read_DHparams ('%s'): %s", __func__, dhfile,
rb_ssl_strerror(rb_ssl_last_err()));
fclose(dhf);
}
else
{
SSL_CTX_set_tmp_dh(ssl_ctx_new, dhp);
DH_free(dhp);
fclose(dhf);
}
}
int ret_old = SSL_CTX_set_cipher_list(ssl_ctx_new, cipherlist);
if (ret_old != 1)
{
(void) rb_lib_log("%s: no valid old-style ciphersuites found "
"in ssl_cipher_list; will use defaults",
__func__);
ret_old = SSL_CTX_set_cipher_list(ssl_ctx_new, rb_default_ciphers);
}
#ifndef LRB_HAVE_TLS13
int ret_new = 0;
#else
int ret_new = SSL_CTX_set_ciphersuites(ssl_ctx_new, cipherlist);
if (ret_new != 1)
{
(void) rb_lib_log("%s: no valid new-style ciphersuites found "
"in ssl_cipher_list; will use defaults",
__func__);
ret_new = SSL_CTX_set_ciphersuites(ssl_ctx_new, rb_default_ciphers);
}
#endif
if (ret_old != 1 && ret_new != 1)
{
rb_lib_log("%s: could not configure any ciphers", __func__);
SSL_CTX_free(ssl_ctx_new);
return 0;
}
SSL_CTX_set_session_cache_mode(ssl_ctx_new, SSL_SESS_CACHE_OFF);
SSL_CTX_set_verify(ssl_ctx_new, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, verify_accept_all_cb);
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
(void) SSL_CTX_clear_options(ssl_ctx_new, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
#endif
#ifndef LRB_HAVE_TLS_METHOD_API
(void) SSL_CTX_set_options(ssl_ctx_new, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
#endif
#ifdef SSL_OP_NO_TICKET
(void) SSL_CTX_set_options(ssl_ctx_new, SSL_OP_NO_TICKET);
#endif
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
(void) SSL_CTX_set_options(ssl_ctx_new, SSL_OP_CIPHER_SERVER_PREFERENCE);
#endif
#ifdef SSL_OP_SINGLE_DH_USE
(void) SSL_CTX_set_options(ssl_ctx_new, SSL_OP_SINGLE_DH_USE);
#endif
#ifdef SSL_OP_SINGLE_ECDH_USE
(void) SSL_CTX_set_options(ssl_ctx_new, SSL_OP_SINGLE_ECDH_USE);
#endif
#ifdef LRB_HAVE_TLS_ECDH_AUTO
(void) SSL_CTX_set_ecdh_auto(ssl_ctx_new, 1);
#endif
#ifdef LRB_HAVE_TLS_SET_CURVES
(void) SSL_CTX_set1_curves_list(ssl_ctx_new, rb_default_curves);
#else
# if (OPENSSL_VERSION_NUMBER >= 0x10000000L) && !defined(OPENSSL_NO_ECDH) && defined(NID_secp384r1)
EC_KEY *const ec_key = EC_KEY_new_by_curve_name(NID_secp384r1);
if(ec_key != NULL)
{
SSL_CTX_set_tmp_ecdh(ssl_ctx_new, ec_key);
EC_KEY_free(ec_key);
}
else
rb_lib_log("%s: EC_KEY_new_by_curve_name failed; will not enable ECDHE- ciphers", __func__);
# else
rb_lib_log("%s: OpenSSL built without ECDH support; will not enable ECDHE- ciphers", __func__);
# endif
#endif
if(ssl_ctx)
SSL_CTX_free(ssl_ctx);
ssl_ctx = ssl_ctx_new;
rb_lib_log("%s: TLS configuration successful", __func__);
return 1;
}
int
rb_init_prng(const char *const path, prng_seed_t seed_type)
{
(void) rb_ssl_last_err();
if(seed_type == RB_PRNG_FILE && RAND_load_file(path, -1) < 0)
rb_lib_log("%s: RAND_load_file: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
if(RAND_status() != 1)
{
rb_lib_log("%s: RAND_status: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
return 0;
}
rb_lib_log("%s: PRNG initialised", __func__);
return 1;
}
int
rb_get_random(void *const buf, const size_t length)
{
(void) rb_ssl_last_err();
if(RAND_bytes(buf, (int) length) != 1)
{
rb_lib_log("%s: RAND_bytes: %s", __func__, rb_ssl_strerror(rb_ssl_last_err()));
return 0;
}
return 1;
}
const char *
rb_get_ssl_strerror(rb_fde_t *const F)
{
return rb_ssl_strerror(F->ssl_errno);
}
int
rb_get_ssl_certfp(rb_fde_t *const F, uint8_t certfp[const RB_SSL_CERTFP_LEN], const int method)
{
if(F == NULL || F->ssl == NULL)
return 0;
X509 *const peer_cert = SSL_get_peer_certificate(SSL_P(F));
if(peer_cert == NULL)
return 0;
int len = 0;
switch(SSL_get_verify_result(SSL_P(F)))
{
case X509_V_OK:
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
case X509_V_ERR_CERT_UNTRUSTED:
len = make_certfp(peer_cert, certfp, method);
// fallthrough
default:
X509_free(peer_cert);
return len;
}
}
int
rb_get_ssl_certfp_file(const char *const filename, uint8_t certfp[const RB_SSL_CERTFP_LEN], const int method)
{
FILE *const fp = fopen(filename, "r");
if (fp == NULL)
return -1;
X509 *const cert = PEM_read_X509(fp, NULL, NULL, NULL);
if (cert == NULL)
{
fclose(fp);
return 0;
}
int len = make_certfp(cert, certfp, method);
X509_free(cert);
fclose(fp);
return len;
}
void
rb_get_ssl_info(char *const buf, const size_t len)
{
#ifdef LRB_SSL_FULL_VERSION_INFO
if(LRB_SSL_VNUM_RUNTIME == LRB_SSL_VNUM_COMPILETIME)
(void) snprintf(buf, len, "OpenSSL: compiled 0x%lx, library %s",
LRB_SSL_VNUM_COMPILETIME, LRB_SSL_VTEXT_COMPILETIME);
else
(void) snprintf(buf, len, "OpenSSL: compiled (0x%lx, %s), library (0x%lx, %s)",
LRB_SSL_VNUM_COMPILETIME, LRB_SSL_VTEXT_COMPILETIME,
LRB_SSL_VNUM_RUNTIME, LRB_SSL_VTEXT_RUNTIME);
#else
(void) snprintf(buf, len, "OpenSSL: compiled 0x%lx, library %s",
LRB_SSL_VNUM_COMPILETIME, LRB_SSL_VTEXT_RUNTIME);
#endif
}
const char *
rb_ssl_get_cipher(rb_fde_t *const F)
{
if(F == NULL || F->ssl == NULL)
return NULL;
static char buf[512];
const char *const version = SSL_get_version(SSL_P(F));
const char *const cipher = SSL_get_cipher_name(SSL_P(F));
(void) snprintf(buf, sizeof buf, "%s, %s", version, cipher);
return buf;
}
ssize_t
rb_ssl_read(rb_fde_t *const F, void *const buf, const size_t count)
{
return rb_ssl_read_or_write(0, F, buf, NULL, count);
}
ssize_t
rb_ssl_write(rb_fde_t *const F, const void *const buf, const size_t count)
{
return rb_ssl_read_or_write(1, F, NULL, buf, count);
}
/*
* Internal library-agnostic code
*/
static void
rb_ssl_connect_realcb(rb_fde_t *const F, const int status, struct ssl_connect *const sconn)
{
lrb_assert(F->connect != NULL);
F->connect->callback = sconn->callback;
F->connect->data = sconn->data;
rb_connect_callback(F, status);
rb_free(sconn);
}
static void
rb_ssl_timeout_cb(rb_fde_t *const F, void *const data __attribute__((unused)))
{
lrb_assert(F->accept != NULL);
lrb_assert(F->accept->callback != NULL);
F->accept->callback(F, RB_ERR_TIMEOUT, NULL, 0, F->accept->data);
}
static void
rb_ssl_tryconn_timeout_cb(rb_fde_t *const F, void *const data)
{
rb_ssl_connect_realcb(F, RB_ERR_TIMEOUT, data);
}
static void
rb_ssl_tryconn(rb_fde_t *const F, const int status, void *const data)
{
lrb_assert(F != NULL);
struct ssl_connect *const sconn = data;
if(status != RB_OK)
{
rb_ssl_connect_realcb(F, status, sconn);
return;
}
F->type |= RB_FD_SSL;
rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
rb_ssl_init_fd(F, RB_FD_TLS_DIRECTION_OUT);
rb_ssl_connect_common(F, sconn);
}
/*
* External library-agnostic code
*/
int
rb_supports_ssl(void)
{
return 1;
}
unsigned int
rb_ssl_handshake_count(rb_fde_t *const F)
{
return F->handshake_count;
}
void
rb_ssl_clear_handshake_count(rb_fde_t *const F)
{
F->handshake_count = 0;
}
void
rb_ssl_start_accepted(rb_fde_t *const F, ACCB *const cb, void *const data, const int timeout)
{
F->type |= RB_FD_SSL;
F->accept = rb_malloc(sizeof(struct acceptdata));
F->accept->callback = cb;
F->accept->data = data;
F->accept->addrlen = 0;
(void) memset(&F->accept->S, 0x00, sizeof F->accept->S);
rb_settimeout(F, timeout, rb_ssl_timeout_cb, NULL);
rb_ssl_init_fd(F, RB_FD_TLS_DIRECTION_IN);
rb_ssl_accept_common(F, NULL);
}
void
rb_ssl_accept_setup(rb_fde_t *const srv_F, rb_fde_t *const cli_F, struct sockaddr *const st, const int addrlen)
{
cli_F->type |= RB_FD_SSL;
cli_F->accept = rb_malloc(sizeof(struct acceptdata));
cli_F->accept->callback = srv_F->accept->callback;
cli_F->accept->data = srv_F->accept->data;
cli_F->accept->addrlen = (rb_socklen_t) addrlen;
(void) memset(&cli_F->accept->S, 0x00, sizeof cli_F->accept->S);
(void) memcpy(&cli_F->accept->S, st, (size_t) addrlen);
rb_settimeout(cli_F, 10, rb_ssl_timeout_cb, NULL);
rb_ssl_init_fd(cli_F, RB_FD_TLS_DIRECTION_IN);
rb_ssl_accept_common(cli_F, NULL);
}
int
rb_ssl_listen(rb_fde_t *const F, const int backlog, const int defer_accept)
{
int result = rb_listen(F, backlog, defer_accept);
F->type = RB_FD_SOCKET | RB_FD_LISTEN | RB_FD_SSL;
return result;
}
void
rb_connect_tcp_ssl(rb_fde_t *const F, struct sockaddr *const dest, struct sockaddr *const clocal,
CNCB *const callback, void *const data, const int timeout)
{
if(F == NULL)
return;
struct ssl_connect *const sconn = rb_malloc(sizeof *sconn);
sconn->data = data;
sconn->callback = callback;
sconn->timeout = timeout;
rb_connect_tcp(F, dest, clocal, rb_ssl_tryconn, sconn, timeout);
}
void
rb_ssl_start_connected(rb_fde_t *const F, CNCB *const callback, void *const data, const int timeout)
{
if(F == NULL)
return;
struct ssl_connect *const sconn = rb_malloc(sizeof *sconn);
sconn->data = data;
sconn->callback = callback;
sconn->timeout = timeout;
F->connect = rb_malloc(sizeof(struct conndata));
F->connect->callback = callback;
F->connect->data = data;
F->type |= RB_FD_SSL;
rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
rb_ssl_init_fd(F, RB_FD_TLS_DIRECTION_OUT);
rb_ssl_connect_common(F, sconn);
}
#endif /* HAVE_OPENSSL */
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