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solanum-vs-hackint-and-char.../librb/src/openssl.c
Simon Arlott 0346918701
add mkfingerprint program
2016-04-26 20:49:03 +01:00

818 lines
18 KiB
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/*
* librb: a library used by ircd-ratbox and other things
* openssl.c: openssl related code
*
* Copyright (C) 2007-2008 ircd-ratbox development team
* Copyright (C) 2007-2008 Aaron Sethman <androsyn@ratbox.org>
*
* 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/ssl.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/opensslv.h>
/*
* This is a mess but what can you do when the library authors
* refuse to play ball with established conventions?
*/
#if defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER >= 0x20020002L)
# define LRB_HAVE_TLS_METHOD_API 1
#else
# if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER >= 0x10100000L)
# define LRB_HAVE_TLS_METHOD_API 1
# endif
#endif
static SSL_CTX *ssl_server_ctx;
static SSL_CTX *ssl_client_ctx;
static int librb_index = -1;
static unsigned long
get_last_err(void)
{
unsigned long t_err, err = 0;
err = ERR_get_error();
if(err == 0)
return 0;
while((t_err = ERR_get_error()) > 0)
err = t_err;
return err;
}
void
rb_ssl_shutdown(rb_fde_t *F)
{
int i;
if(F == NULL || F->ssl == NULL)
return;
SSL_set_shutdown((SSL *) F->ssl, SSL_RECEIVED_SHUTDOWN);
for(i = 0; i < 4; i++)
{
if(SSL_shutdown((SSL *) F->ssl))
break;
}
get_last_err();
SSL_free((SSL *) F->ssl);
}
unsigned int
rb_ssl_handshake_count(rb_fde_t *F)
{
return F->handshake_count;
}
void
rb_ssl_clear_handshake_count(rb_fde_t *F)
{
F->handshake_count = 0;
}
static void
rb_ssl_timeout(rb_fde_t *F, void *notused)
{
lrb_assert(F->accept != NULL);
F->accept->callback(F, RB_ERR_TIMEOUT, NULL, 0, F->accept->data);
}
static void
rb_ssl_info_callback(SSL * ssl, int where, int ret)
{
if(where & SSL_CB_HANDSHAKE_START)
{
rb_fde_t *F = SSL_get_ex_data(ssl, librb_index);
if(F == NULL)
return;
F->handshake_count++;
}
}
static void
rb_setup_ssl_cb(rb_fde_t *F)
{
SSL_set_ex_data(F->ssl, librb_index, (char *)F);
SSL_set_info_callback((SSL *) F->ssl, (void (*)(const SSL *,int,int))rb_ssl_info_callback);
}
static void
rb_ssl_tryaccept(rb_fde_t *F, void *data)
{
int ssl_err;
lrb_assert(F->accept != NULL);
int flags;
struct acceptdata *ad;
if(!SSL_is_init_finished((SSL *) F->ssl))
{
if((ssl_err = SSL_accept((SSL *) F->ssl)) <= 0)
{
switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err))
{
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
if(ssl_err == SSL_ERROR_WANT_WRITE)
flags = RB_SELECT_WRITE;
else
flags = RB_SELECT_READ;
F->ssl_errno = get_last_err();
rb_setselect(F, flags, rb_ssl_tryaccept, NULL);
break;
case SSL_ERROR_SYSCALL:
F->accept->callback(F, RB_ERROR, NULL, 0, F->accept->data);
break;
default:
F->ssl_errno = get_last_err();
F->accept->callback(F, RB_ERROR_SSL, NULL, 0, F->accept->data);
break;
}
return;
}
}
rb_settimeout(F, 0, NULL, NULL);
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, NULL, NULL);
ad = F->accept;
F->accept = NULL;
ad->callback(F, RB_OK, (struct sockaddr *)&ad->S, ad->addrlen, ad->data);
rb_free(ad);
}
static void
rb_ssl_accept_common(rb_fde_t *new_F)
{
int ssl_err;
if((ssl_err = SSL_accept((SSL *) new_F->ssl)) <= 0)
{
switch (ssl_err = SSL_get_error((SSL *) new_F->ssl, ssl_err))
{
case SSL_ERROR_SYSCALL:
if(rb_ignore_errno(errno))
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
{
new_F->ssl_errno = get_last_err();
rb_setselect(new_F, RB_SELECT_READ | RB_SELECT_WRITE,
rb_ssl_tryaccept, NULL);
return;
}
default:
new_F->ssl_errno = get_last_err();
new_F->accept->callback(new_F, RB_ERROR_SSL, NULL, 0, new_F->accept->data);
return;
}
}
else
{
rb_ssl_tryaccept(new_F, NULL);
}
}
void
rb_ssl_start_accepted(rb_fde_t *new_F, ACCB * cb, void *data, int timeout)
{
new_F->type |= RB_FD_SSL;
new_F->ssl = SSL_new(ssl_server_ctx);
new_F->accept = rb_malloc(sizeof(struct acceptdata));
new_F->accept->callback = cb;
new_F->accept->data = data;
rb_settimeout(new_F, timeout, rb_ssl_timeout, NULL);
new_F->accept->addrlen = 0;
SSL_set_fd((SSL *) new_F->ssl, rb_get_fd(new_F));
rb_setup_ssl_cb(new_F);
rb_ssl_accept_common(new_F);
}
void
rb_ssl_accept_setup(rb_fde_t *F, rb_fde_t *new_F, struct sockaddr *st, int addrlen)
{
new_F->type |= RB_FD_SSL;
new_F->ssl = SSL_new(ssl_server_ctx);
new_F->accept = rb_malloc(sizeof(struct acceptdata));
new_F->accept->callback = F->accept->callback;
new_F->accept->data = F->accept->data;
rb_settimeout(new_F, 10, rb_ssl_timeout, NULL);
memcpy(&new_F->accept->S, st, addrlen);
new_F->accept->addrlen = addrlen;
SSL_set_fd((SSL *) new_F->ssl, rb_get_fd(new_F));
rb_setup_ssl_cb(new_F);
rb_ssl_accept_common(new_F);
}
static ssize_t
rb_ssl_read_or_write(int r_or_w, rb_fde_t *F, void *rbuf, const void *wbuf, size_t count)
{
ssize_t ret;
unsigned long err;
SSL *ssl = F->ssl;
if(r_or_w == 0)
ret = (ssize_t) SSL_read(ssl, rbuf, (int)count);
else
ret = (ssize_t) SSL_write(ssl, wbuf, (int)count);
if(ret < 0)
{
switch (SSL_get_error(ssl, 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 = get_last_err();
if(err == 0)
{
F->ssl_errno = 0;
return RB_RW_IO_ERROR;
}
break;
default:
err = get_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;
}
ssize_t
rb_ssl_read(rb_fde_t *F, void *buf, size_t count)
{
return rb_ssl_read_or_write(0, F, buf, NULL, count);
}
ssize_t
rb_ssl_write(rb_fde_t *F, const void *buf, size_t count)
{
return rb_ssl_read_or_write(1, F, NULL, buf, count);
}
static int
verify_accept_all_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
{
return 1;
}
static const char *
get_ssl_error(unsigned long err)
{
static char buf[512];
ERR_error_string_n(err, buf, sizeof buf);
return buf;
}
int
rb_init_ssl(void)
{
int ret = 1;
char librb_data[] = "librb data";
const char librb_ciphers[] = "kEECDH+HIGH:kEDH+HIGH:HIGH:!RC4:!aNULL";
SSL_load_error_strings();
SSL_library_init();
librb_index = SSL_get_ex_new_index(0, librb_data, NULL, NULL, NULL);
#ifndef LRB_HAVE_TLS_METHOD_API
ssl_server_ctx = SSL_CTX_new(SSLv23_server_method());
#else
ssl_server_ctx = SSL_CTX_new(TLS_server_method());
#endif
if(ssl_server_ctx == NULL)
{
rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL server context: %s",
get_ssl_error(ERR_get_error()));
ret = 0;
}
long server_options = SSL_CTX_get_options(ssl_server_ctx);
#ifndef LRB_HAVE_TLS_METHOD_API
server_options |= SSL_OP_NO_SSLv2;
server_options |= SSL_OP_NO_SSLv3;
#endif
#ifdef SSL_OP_SINGLE_DH_USE
server_options |= SSL_OP_SINGLE_DH_USE;
#endif
#ifdef SSL_OP_SINGLE_ECDH_USE
server_options |= SSL_OP_SINGLE_ECDH_USE;
#endif
#ifdef SSL_OP_NO_TICKET
server_options |= SSL_OP_NO_TICKET;
#endif
server_options |= SSL_OP_CIPHER_SERVER_PREFERENCE;
SSL_CTX_set_options(ssl_server_ctx, server_options);
SSL_CTX_set_verify(ssl_server_ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, verify_accept_all_cb);
SSL_CTX_set_session_cache_mode(ssl_server_ctx, SSL_SESS_CACHE_OFF);
SSL_CTX_set_cipher_list(ssl_server_ctx, librb_ciphers);
/* Set ECDHE on OpenSSL 1.00+, but make sure it's actually available
* (it's not by default on Solaris or Red Hat... fuck Red Hat and Oracle)
*/
#if (OPENSSL_VERSION_NUMBER >= 0x10000000L) && !defined(OPENSSL_NO_ECDH)
EC_KEY *key = EC_KEY_new_by_curve_name(NID_secp384r1);
if (key) {
SSL_CTX_set_tmp_ecdh(ssl_server_ctx, key);
EC_KEY_free(key);
}
#endif
#ifndef LRB_HAVE_TLS_METHOD_API
ssl_client_ctx = SSL_CTX_new(SSLv23_client_method());
#else
ssl_client_ctx = SSL_CTX_new(TLS_client_method());
#endif
if(ssl_client_ctx == NULL)
{
rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL client context: %s",
get_ssl_error(ERR_get_error()));
ret = 0;
}
#ifndef LRB_HAVE_TLS_METHOD_API
SSL_CTX_set_options(ssl_client_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
#endif
#ifdef SSL_OP_NO_TICKET
SSL_CTX_set_options(ssl_client_ctx, SSL_OP_NO_TICKET);
#endif
SSL_CTX_set_cipher_list(ssl_client_ctx, librb_ciphers);
return ret;
}
int
rb_setup_ssl_server(const char *cert, const char *keyfile, const char *dhfile, const char *cipher_list)
{
DH *dh;
unsigned long err;
if(cert == NULL)
{
rb_lib_log("rb_setup_ssl_server: No certificate file");
return 0;
}
if(!SSL_CTX_use_certificate_chain_file(ssl_server_ctx, cert) || !SSL_CTX_use_certificate_chain_file(ssl_client_ctx, cert))
{
err = ERR_get_error();
rb_lib_log("rb_setup_ssl_server: Error loading certificate file [%s]: %s", cert,
get_ssl_error(err));
return 0;
}
if(keyfile == NULL)
{
rb_lib_log("rb_setup_ssl_server: No key file");
return 0;
}
if(!SSL_CTX_use_PrivateKey_file(ssl_server_ctx, keyfile, SSL_FILETYPE_PEM) || !SSL_CTX_use_PrivateKey_file(ssl_client_ctx, keyfile, SSL_FILETYPE_PEM))
{
err = ERR_get_error();
rb_lib_log("rb_setup_ssl_server: Error loading keyfile [%s]: %s", keyfile,
get_ssl_error(err));
return 0;
}
if(dhfile != NULL)
{
/* DH parameters aren't necessary, but they are nice..if they didn't pass one..that is their problem */
BIO *bio = BIO_new_file(dhfile, "r");
if(bio != NULL)
{
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
if(dh == NULL)
{
err = ERR_get_error();
rb_lib_log
("rb_setup_ssl_server: Error loading DH params file [%s]: %s",
dhfile, get_ssl_error(err));
BIO_free(bio);
return 0;
}
BIO_free(bio);
SSL_CTX_set_tmp_dh(ssl_server_ctx, dh);
}
else
{
err = ERR_get_error();
rb_lib_log("rb_setup_ssl_server: Error loading DH params file [%s]: %s",
dhfile, get_ssl_error(err));
}
}
if (cipher_list != NULL)
{
SSL_CTX_set_cipher_list(ssl_server_ctx, cipher_list);
}
return 1;
}
int
rb_ssl_listen(rb_fde_t *F, int backlog, int defer_accept)
{
int result;
result = rb_listen(F, backlog, defer_accept);
F->type = RB_FD_SOCKET | RB_FD_LISTEN | RB_FD_SSL;
return result;
}
struct ssl_connect
{
CNCB *callback;
void *data;
int timeout;
};
static void
rb_ssl_connect_realcb(rb_fde_t *F, int status, struct ssl_connect *sconn)
{
F->connect->callback = sconn->callback;
F->connect->data = sconn->data;
rb_free(sconn);
rb_connect_callback(F, status);
}
static void
rb_ssl_tryconn_timeout_cb(rb_fde_t *F, void *data)
{
rb_ssl_connect_realcb(F, RB_ERR_TIMEOUT, data);
}
static void
rb_ssl_tryconn_cb(rb_fde_t *F, void *data)
{
struct ssl_connect *sconn = data;
int ssl_err;
if(!SSL_is_init_finished((SSL *) F->ssl))
{
if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0)
{
switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err))
{
case SSL_ERROR_SYSCALL:
if(rb_ignore_errno(errno))
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
{
F->ssl_errno = get_last_err();
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE,
rb_ssl_tryconn_cb, sconn);
return;
}
default:
F->ssl_errno = get_last_err();
rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn);
return;
}
}
else
{
rb_ssl_connect_realcb(F, RB_OK, sconn);
}
}
}
static void
rb_ssl_tryconn(rb_fde_t *F, int status, void *data)
{
struct ssl_connect *sconn = data;
int ssl_err;
if(status != RB_OK)
{
rb_ssl_connect_realcb(F, status, sconn);
return;
}
F->type |= RB_FD_SSL;
F->ssl = SSL_new(ssl_client_ctx);
SSL_set_fd((SSL *) F->ssl, F->fd);
rb_setup_ssl_cb(F);
rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0)
{
switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err))
{
case SSL_ERROR_SYSCALL:
if(rb_ignore_errno(errno))
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
{
F->ssl_errno = get_last_err();
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE,
rb_ssl_tryconn_cb, sconn);
return;
}
default:
F->ssl_errno = get_last_err();
rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn);
return;
}
}
else
{
rb_ssl_connect_realcb(F, RB_OK, sconn);
}
}
void
rb_connect_tcp_ssl(rb_fde_t *F, struct sockaddr *dest,
struct sockaddr *clocal, CNCB * callback, void *data, int timeout)
{
struct ssl_connect *sconn;
if(F == NULL)
return;
sconn = rb_malloc(sizeof(struct ssl_connect));
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 *F, CNCB * callback, void *data, int timeout)
{
struct ssl_connect *sconn;
int ssl_err;
if(F == NULL)
return;
sconn = rb_malloc(sizeof(struct ssl_connect));
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;
F->ssl = SSL_new(ssl_client_ctx);
SSL_set_fd((SSL *) F->ssl, F->fd);
rb_setup_ssl_cb(F);
rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
if((ssl_err = SSL_connect((SSL *) F->ssl)) <= 0)
{
switch (ssl_err = SSL_get_error((SSL *) F->ssl, ssl_err))
{
case SSL_ERROR_SYSCALL:
if(rb_ignore_errno(errno))
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
{
F->ssl_errno = get_last_err();
rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE,
rb_ssl_tryconn_cb, sconn);
return;
}
default:
F->ssl_errno = get_last_err();
rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn);
return;
}
}
else
{
rb_ssl_connect_realcb(F, RB_OK, sconn);
}
}
int
rb_init_prng(const char *path, prng_seed_t seed_type)
{
if(seed_type == RB_PRNG_DEFAULT)
{
#ifdef _WIN32
RAND_screen();
#endif
return RAND_status();
}
if(path == NULL)
return RAND_status();
switch (seed_type)
{
case RB_PRNG_FILE:
if(RAND_load_file(path, -1) == -1)
return -1;
break;
#ifdef _WIN32
case RB_PRNGWIN32:
RAND_screen();
break;
#endif
default:
return -1;
}
return RAND_status();
}
int
rb_get_random(void *buf, size_t length)
{
int ret;
if((ret = RAND_bytes(buf, length)) == 0)
{
/* remove the error from the queue */
ERR_get_error();
}
return ret;
}
const char *
rb_get_ssl_strerror(rb_fde_t *F)
{
return get_ssl_error(F->ssl_errno);
}
static unsigned int
make_certfp(X509 *cert, uint8_t certfp[RB_SSL_CERTFP_LEN], int method)
{
const ASN1_ITEM *it;
const EVP_MD *evp;
void *data;
unsigned int len;
switch(method)
{
case RB_SSL_CERTFP_METH_CERT_SHA1:
it = ASN1_ITEM_rptr(X509);
evp = EVP_sha1();
data = cert;
len = RB_SSL_CERTFP_LEN_SHA1;
break;
case RB_SSL_CERTFP_METH_CERT_SHA256:
it = ASN1_ITEM_rptr(X509);
evp = EVP_sha256();
data = cert;
len = RB_SSL_CERTFP_LEN_SHA256;
break;
case RB_SSL_CERTFP_METH_CERT_SHA512:
it = ASN1_ITEM_rptr(X509);
evp = EVP_sha512();
data = cert;
len = RB_SSL_CERTFP_LEN_SHA512;
break;
case RB_SSL_CERTFP_METH_SPKI_SHA256:
it = ASN1_ITEM_rptr(X509_PUBKEY);
evp = EVP_sha256();
data = X509_get_X509_PUBKEY(cert);
len = RB_SSL_CERTFP_LEN_SHA256;
break;
case RB_SSL_CERTFP_METH_SPKI_SHA512:
it = ASN1_ITEM_rptr(X509_PUBKEY);
evp = EVP_sha512();
data = X509_get_X509_PUBKEY(cert);
len = RB_SSL_CERTFP_LEN_SHA512;
break;
default:
return 0;
}
if (ASN1_item_digest(it, evp, data, certfp, &len) != 1)
len = 0;
return len;
}
int
rb_get_ssl_certfp(rb_fde_t *F, uint8_t certfp[RB_SSL_CERTFP_LEN], int method)
{
X509 *cert;
int res;
if (F->ssl == NULL)
return 0;
cert = SSL_get_peer_certificate((SSL *) F->ssl);
if(cert != NULL)
{
res = SSL_get_verify_result((SSL *) F->ssl);
if(
res == X509_V_OK ||
res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
res == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY ||
res == X509_V_ERR_CERT_UNTRUSTED ||
res == X509_V_ERR_CERT_NOT_YET_VALID ||
res == X509_V_ERR_CERT_HAS_EXPIRED)
{
unsigned int len = make_certfp(cert, certfp, method);
X509_free(cert);
return len;
}
X509_free(cert);
}
return 0;
}
int
rb_get_ssl_certfp_file(const char *filename, uint8_t certfp[RB_SSL_CERTFP_LEN], int method)
{
X509 *cert;
FILE *f = fopen(filename, "r");
if (!f)
return -1;
cert = PEM_read_X509(f, NULL, NULL, NULL);
fclose(f);
if (cert) {
unsigned int len = make_certfp(cert, certfp, method);
X509_free(cert);
return len;
}
return 0;
}
int
rb_supports_ssl(void)
{
return 1;
}
void
rb_get_ssl_info(char *buf, size_t len)
{
snprintf(buf, len, "Using SSL: %s compiled: 0x%lx, library 0x%lx",
SSLeay_version(SSLEAY_VERSION),
(long)OPENSSL_VERSION_NUMBER, SSLeay());
}
const char *
rb_ssl_get_cipher(rb_fde_t *F)
{
const SSL_CIPHER *sslciph;
if(F == NULL || F->ssl == NULL)
return NULL;
if((sslciph = SSL_get_current_cipher(F->ssl)) == NULL)
return NULL;
return SSL_CIPHER_get_name(sslciph);
}
#endif /* HAVE_OPESSL */
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