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|
/*
network-ssl.c : SSL support
Copyright (C) 2002 vjt
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 "module.h"
#include "network.h"
#include "net-sendbuffer.h"
#include "misc.h"
#include "servers.h"
#include "signals.h"
#include "tls.h"
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
/* OpenSSL 1.1.0 introduced some backward-incompatible changes to the api */
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
/* The two functions below could be already defined if OPENSSL_API_COMPAT is
* below the 1.1.0 version so let's do a clean start */
#undef X509_get_notBefore
#undef X509_get_notAfter
#define X509_get_notBefore(x) X509_get0_notBefore(x)
#define X509_get_notAfter(x) X509_get0_notAfter(x)
#define ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
#endif
/* ssl i/o channel object */
typedef struct
{
GIOChannel pad;
gint fd;
GIOChannel *giochan;
SSL *ssl;
SSL_CTX *ctx;
unsigned int verify:1;
SERVER_REC *server;
int port;
} GIOSSLChannel;
static int ssl_inited = FALSE;
static void irssi_ssl_free(GIOChannel *handle)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
g_io_channel_unref(chan->giochan);
SSL_free(chan->ssl);
SSL_CTX_free(chan->ctx);
g_free(chan);
}
/* Checks if the given string has internal NUL characters. */
static gboolean has_internal_nul(const char* str, int len) {
/* Remove trailing nul characters. They would give false alarms */
while (len > 0 && str[len-1] == 0)
len--;
return strlen(str) != len;
}
/* tls_dns_name - Extract valid DNS name from subjectAltName value */
static const char *tls_dns_name(const GENERAL_NAME * gn)
{
const char *dnsname;
/* We expect the OpenSSL library to construct GEN_DNS extension objects as
ASN1_IA5STRING values. Check we got the right union member. */
if (ASN1_STRING_type(gn->d.ia5) != V_ASN1_IA5STRING) {
g_warning("Invalid ASN1 value type in subjectAltName");
return NULL;
}
/* Safe to treat as an ASCII string possibly holding a DNS name */
dnsname = (char *) ASN1_STRING_data(gn->d.ia5);
if (has_internal_nul(dnsname, ASN1_STRING_length(gn->d.ia5))) {
g_warning("Internal NUL in subjectAltName");
return NULL;
}
return dnsname;
}
/* tls_text_name - extract certificate property value by name */
static char *tls_text_name(X509_NAME *name, int nid)
{
int pos;
X509_NAME_ENTRY *entry;
ASN1_STRING *entry_str;
int utf8_length;
unsigned char *utf8_value;
char *result;
if (name == 0 || (pos = X509_NAME_get_index_by_NID(name, nid, -1)) < 0) {
return NULL;
}
entry = X509_NAME_get_entry(name, pos);
g_return_val_if_fail(entry != NULL, NULL);
entry_str = X509_NAME_ENTRY_get_data(entry);
g_return_val_if_fail(entry_str != NULL, NULL);
/* Convert everything into UTF-8. It's up to OpenSSL to do something
reasonable when converting ASCII formats that contain non-ASCII
content. */
if ((utf8_length = ASN1_STRING_to_UTF8(&utf8_value, entry_str)) < 0) {
g_warning("Error decoding ASN.1 type=%d", ASN1_STRING_type(entry_str));
return NULL;
}
if (has_internal_nul((char *)utf8_value, utf8_length)) {
g_warning("NUL character in hostname in certificate");
OPENSSL_free(utf8_value);
return NULL;
}
result = g_strdup((char *) utf8_value);
OPENSSL_free(utf8_value);
return result;
}
/** check if a hostname in the certificate matches the hostname we used for the connection */
static gboolean match_hostname(const char *cert_hostname, const char *hostname)
{
const char *hostname_left;
if (!strcasecmp(cert_hostname, hostname)) { /* exact match */
return TRUE;
} else if (cert_hostname[0] == '*' && cert_hostname[1] == '.' && cert_hostname[2] != 0) { /* wildcard match */
/* The initial '*' matches exactly one hostname component */
hostname_left = strchr(hostname, '.');
if (hostname_left != NULL && ! strcasecmp(hostname_left + 1, cert_hostname + 2)) {
return TRUE;
}
}
return FALSE;
}
/* based on verify_extract_name from tls_client.c in postfix */
static gboolean irssi_ssl_verify_hostname(X509 *cert, const char *hostname)
{
int gen_index, gen_count;
gboolean matched = FALSE, has_dns_name = FALSE;
const char *cert_dns_name;
char *cert_subject_cn;
const GENERAL_NAME *gn;
STACK_OF(GENERAL_NAME) * gens;
/* Verify the dNSName(s) in the peer certificate against the hostname. */
gens = X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0);
if (gens) {
gen_count = sk_GENERAL_NAME_num(gens);
for (gen_index = 0; gen_index < gen_count && !matched; ++gen_index) {
gn = sk_GENERAL_NAME_value(gens, gen_index);
if (gn->type != GEN_DNS)
continue;
/* Even if we have an invalid DNS name, we still ultimately
ignore the CommonName, because subjectAltName:DNS is
present (though malformed). */
has_dns_name = TRUE;
cert_dns_name = tls_dns_name(gn);
if (cert_dns_name && *cert_dns_name) {
matched = match_hostname(cert_dns_name, hostname);
}
}
/* Free stack *and* member GENERAL_NAME objects */
sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
}
if (has_dns_name) {
if (! matched) {
/* The CommonName in the issuer DN is obsolete when SubjectAltName is available. */
g_warning("None of the Subject Alt Names in the certificate match hostname '%s'", hostname);
}
return matched;
} else { /* No subjectAltNames, look at CommonName */
cert_subject_cn = tls_text_name(X509_get_subject_name(cert), NID_commonName);
if (cert_subject_cn && *cert_subject_cn) {
matched = match_hostname(cert_subject_cn, hostname);
if (! matched) {
g_warning("SSL certificate common name '%s' doesn't match host name '%s'", cert_subject_cn, hostname);
}
} else {
g_warning("No subjectAltNames and no valid common name in certificate");
}
free(cert_subject_cn);
}
return matched;
}
static gboolean irssi_ssl_verify(SSL *ssl, SSL_CTX *ctx, const char* hostname, int port, X509 *cert, SERVER_REC *server, TLS_REC *tls_rec)
{
long result;
result = SSL_get_verify_result(ssl);
if (result != X509_V_OK) {
g_warning("Could not verify TLS servers certificate: %s", X509_verify_cert_error_string(result));
return FALSE;
} else if (! irssi_ssl_verify_hostname(cert, hostname)){
return FALSE;
}
return TRUE;
}
static GIOStatus irssi_ssl_read(GIOChannel *handle, gchar *buf, gsize len, gsize *ret, GError **gerr)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
gint ret1, err;
const char *errstr;
gchar *errmsg;
ERR_clear_error();
ret1 = SSL_read(chan->ssl, buf, len);
if(ret1 <= 0)
{
*ret = 0;
err = SSL_get_error(chan->ssl, ret1);
if(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
return G_IO_STATUS_AGAIN;
else if(err == SSL_ERROR_ZERO_RETURN)
return G_IO_STATUS_EOF;
else if (err == SSL_ERROR_SYSCALL)
{
errstr = ERR_reason_error_string(ERR_get_error());
if (errstr == NULL && ret1 == -1)
errstr = strerror(errno);
if (errstr == NULL)
errstr = "server closed connection unexpectedly";
}
else
{
errstr = ERR_reason_error_string(ERR_get_error());
if (errstr == NULL)
errstr = "unknown SSL error";
}
errmsg = g_strdup_printf("SSL read error: %s", errstr);
*gerr = g_error_new_literal(G_IO_CHANNEL_ERROR, G_IO_CHANNEL_ERROR_FAILED,
errmsg);
g_free(errmsg);
return G_IO_STATUS_ERROR;
}
else
{
*ret = ret1;
return G_IO_STATUS_NORMAL;
}
/*UNREACH*/
return G_IO_STATUS_ERROR;
}
static GIOStatus irssi_ssl_write(GIOChannel *handle, const gchar *buf, gsize len, gsize *ret, GError **gerr)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
gint ret1, err;
const char *errstr;
gchar *errmsg;
ERR_clear_error();
ret1 = SSL_write(chan->ssl, (const char *)buf, len);
if(ret1 <= 0)
{
*ret = 0;
err = SSL_get_error(chan->ssl, ret1);
if(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
return G_IO_STATUS_AGAIN;
else if(err == SSL_ERROR_ZERO_RETURN)
errstr = "server closed connection";
else if (err == SSL_ERROR_SYSCALL)
{
errstr = ERR_reason_error_string(ERR_get_error());
if (errstr == NULL && ret1 == -1)
errstr = strerror(errno);
if (errstr == NULL)
errstr = "server closed connection unexpectedly";
}
else
{
errstr = ERR_reason_error_string(ERR_get_error());
if (errstr == NULL)
errstr = "unknown SSL error";
}
errmsg = g_strdup_printf("SSL write error: %s", errstr);
*gerr = g_error_new_literal(G_IO_CHANNEL_ERROR, G_IO_CHANNEL_ERROR_FAILED,
errmsg);
g_free(errmsg);
return G_IO_STATUS_ERROR;
}
else
{
*ret = ret1;
return G_IO_STATUS_NORMAL;
}
/*UNREACH*/
return G_IO_STATUS_ERROR;
}
static GIOStatus irssi_ssl_seek(GIOChannel *handle, gint64 offset, GSeekType type, GError **gerr)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
return chan->giochan->funcs->io_seek(handle, offset, type, gerr);
}
static GIOStatus irssi_ssl_close(GIOChannel *handle, GError **gerr)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
return chan->giochan->funcs->io_close(handle, gerr);
}
static GSource *irssi_ssl_create_watch(GIOChannel *handle, GIOCondition cond)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
return chan->giochan->funcs->io_create_watch(handle, cond);
}
static GIOStatus irssi_ssl_set_flags(GIOChannel *handle, GIOFlags flags, GError **gerr)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
return chan->giochan->funcs->io_set_flags(handle, flags, gerr);
}
static GIOFlags irssi_ssl_get_flags(GIOChannel *handle)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
return chan->giochan->funcs->io_get_flags(handle);
}
static GIOFuncs irssi_ssl_channel_funcs = {
irssi_ssl_read,
irssi_ssl_write,
irssi_ssl_seek,
irssi_ssl_close,
irssi_ssl_create_watch,
irssi_ssl_free,
irssi_ssl_set_flags,
irssi_ssl_get_flags
};
static gboolean irssi_ssl_init(void)
{
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
if (!OPENSSL_init_ssl(OPENSSL_INIT_SSL_DEFAULT, NULL)) {
g_error("Could not initialize OpenSSL");
return FALSE;
}
#else
SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
#endif
ssl_inited = TRUE;
return TRUE;
}
static int get_pem_password_callback(char *buffer, int max_length, int rwflag, void *pass)
{
char *password;
size_t length;
if (pass == NULL)
return 0;
password = (char *)pass;
length = strlen(pass);
if (length > max_length)
return 0;
memcpy(buffer, password, length + 1);
return length;
}
static GIOChannel *irssi_ssl_get_iochannel(GIOChannel *handle, int port, SERVER_REC *server)
{
GIOSSLChannel *chan;
GIOChannel *gchan;
int fd;
SSL *ssl;
SSL_CTX *ctx = NULL;
const char *mycert = server->connrec->tls_cert;
const char *mypkey = server->connrec->tls_pkey;
const char *mypass = server->connrec->tls_pass;
const char *cafile = server->connrec->tls_cafile;
const char *capath = server->connrec->tls_capath;
const char *ciphers = server->connrec->tls_ciphers;
gboolean verify = server->connrec->tls_verify;
g_return_val_if_fail(handle != NULL, NULL);
if(!ssl_inited && !irssi_ssl_init())
return NULL;
if(!(fd = g_io_channel_unix_get_fd(handle)))
return NULL;
ERR_clear_error();
ctx = SSL_CTX_new(SSLv23_client_method());
if (ctx == NULL) {
g_error("Could not allocate memory for SSL context");
return NULL;
}
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
SSL_CTX_set_default_passwd_cb(ctx, get_pem_password_callback);
SSL_CTX_set_default_passwd_cb_userdata(ctx, (void *)mypass);
if (ciphers != NULL && ciphers[0] != '\0') {
if (SSL_CTX_set_cipher_list(ctx, ciphers) != 1)
g_warning("No valid SSL cipher suite could be selected");
}
if (mycert && *mycert) {
char *scert = NULL, *spkey = NULL;
FILE *fp;
scert = convert_home(mycert);
if (mypkey && *mypkey)
spkey = convert_home(mypkey);
if ((fp = fopen(scert, "r"))) {
X509 *cert;
/* Let's parse the certificate by hand instead of using
* SSL_CTX_use_certificate_file so that we can validate
* some parts of it. */
cert = PEM_read_X509(fp, NULL, get_pem_password_callback, (void *)mypass);
if (cert != NULL) {
/* Only the expiration date is checked right now */
if (X509_cmp_current_time(X509_get_notAfter(cert)) <= 0 ||
X509_cmp_current_time(X509_get_notBefore(cert)) >= 0)
g_warning("The client certificate is expired");
ERR_clear_error();
if (! SSL_CTX_use_certificate(ctx, cert))
g_warning("Loading of client certificate '%s' failed: %s", mycert, ERR_reason_error_string(ERR_get_error()));
else if (! SSL_CTX_use_PrivateKey_file(ctx, spkey ? spkey : scert, SSL_FILETYPE_PEM))
g_warning("Loading of private key '%s' failed: %s", mypkey ? mypkey : mycert, ERR_reason_error_string(ERR_get_error()));
else if (! SSL_CTX_check_private_key(ctx))
g_warning("Private key does not match the certificate");
X509_free(cert);
} else
g_warning("Loading of client certificate '%s' failed: %s", mycert, ERR_reason_error_string(ERR_get_error()));
fclose(fp);
} else
g_warning("Could not find client certificate '%s'", scert);
g_free(scert);
g_free(spkey);
}
if ((cafile && *cafile) || (capath && *capath)) {
char *scafile = NULL;
char *scapath = NULL;
if (cafile && *cafile)
scafile = convert_home(cafile);
if (capath && *capath)
scapath = convert_home(capath);
if (! SSL_CTX_load_verify_locations(ctx, scafile, scapath)) {
g_warning("Could not load CA list for verifying TLS server certificate");
g_free(scafile);
g_free(scapath);
SSL_CTX_free(ctx);
return NULL;
}
g_free(scafile);
g_free(scapath);
verify = TRUE;
} else {
if (!SSL_CTX_set_default_verify_paths(ctx))
g_warning("Could not load default certificates");
}
if(!(ssl = SSL_new(ctx)))
{
g_warning("Failed to allocate SSL structure");
SSL_CTX_free(ctx);
return NULL;
}
if(!SSL_set_fd(ssl, fd))
{
g_warning("Failed to associate socket to SSL stream");
SSL_free(ssl);
SSL_CTX_free(ctx);
return NULL;
}
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
SSL_set_tlsext_host_name(ssl, server->connrec->address);
#endif
SSL_set_mode(ssl, SSL_MODE_ENABLE_PARTIAL_WRITE |
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
chan = g_new0(GIOSSLChannel, 1);
chan->fd = fd;
chan->giochan = handle;
chan->ssl = ssl;
chan->ctx = ctx;
chan->server = server;
chan->port = port;
chan->verify = verify;
gchan = (GIOChannel *)chan;
gchan->funcs = &irssi_ssl_channel_funcs;
g_io_channel_init(gchan);
gchan->is_readable = gchan->is_writeable = TRUE;
gchan->use_buffer = FALSE;
return gchan;
}
static void set_cipher_info(TLS_REC *tls, SSL *ssl)
{
g_return_if_fail(tls != NULL);
g_return_if_fail(ssl != NULL);
tls_rec_set_protocol_version(tls, SSL_get_version(ssl));
tls_rec_set_cipher(tls, SSL_CIPHER_get_name(SSL_get_current_cipher(ssl)));
tls_rec_set_cipher_size(tls, SSL_get_cipher_bits(ssl, NULL));
}
static void set_pubkey_info(TLS_REC *tls, X509 *cert, unsigned char *cert_fingerprint, size_t cert_fingerprint_size, unsigned char *public_key_fingerprint, size_t public_key_fingerprint_size)
{
g_return_if_fail(tls != NULL);
g_return_if_fail(cert != NULL);
EVP_PKEY *pubkey = NULL;
char *cert_fingerprint_hex = NULL;
char *public_key_fingerprint_hex = NULL;
BIO *bio = NULL;
char buffer[128];
size_t length;
pubkey = X509_get_pubkey(cert);
cert_fingerprint_hex = binary_to_hex(cert_fingerprint, cert_fingerprint_size);
tls_rec_set_certificate_fingerprint(tls, cert_fingerprint_hex);
tls_rec_set_certificate_fingerprint_algorithm(tls, "SHA256");
// Show algorithm.
switch (EVP_PKEY_id(pubkey)) {
case EVP_PKEY_RSA:
tls_rec_set_public_key_algorithm(tls, "RSA");
break;
case EVP_PKEY_DSA:
tls_rec_set_public_key_algorithm(tls, "DSA");
break;
case EVP_PKEY_EC:
tls_rec_set_public_key_algorithm(tls, "EC");
break;
default:
tls_rec_set_public_key_algorithm(tls, "Unknown");
break;
}
public_key_fingerprint_hex = binary_to_hex(public_key_fingerprint, public_key_fingerprint_size);
tls_rec_set_public_key_fingerprint(tls, public_key_fingerprint_hex);
tls_rec_set_public_key_size(tls, EVP_PKEY_bits(pubkey));
tls_rec_set_public_key_fingerprint_algorithm(tls, "SHA256");
// Read the NotBefore timestamp.
bio = BIO_new(BIO_s_mem());
ASN1_TIME_print(bio, X509_get_notBefore(cert));
length = BIO_read(bio, buffer, sizeof(buffer));
buffer[length] = '\0';
BIO_free(bio);
tls_rec_set_not_before(tls, buffer);
// Read the NotAfter timestamp.
bio = BIO_new(BIO_s_mem());
ASN1_TIME_print(bio, X509_get_notAfter(cert));
length = BIO_read(bio, buffer, sizeof(buffer));
buffer[length] = '\0';
BIO_free(bio);
tls_rec_set_not_after(tls, buffer);
g_free(cert_fingerprint_hex);
g_free(public_key_fingerprint_hex);
EVP_PKEY_free(pubkey);
}
static void set_peer_cert_chain_info(TLS_REC *tls, SSL *ssl)
{
g_return_if_fail(tls != NULL);
g_return_if_fail(ssl != NULL);
int nid;
char *key = NULL;
char *value = NULL;
STACK_OF(X509) *chain = NULL;
int i;
int j;
TLS_CERT_REC *cert_rec = NULL;
X509_NAME *name = NULL;
X509_NAME_ENTRY *entry = NULL;
TLS_CERT_ENTRY_REC *tls_cert_entry_rec = NULL;
ASN1_STRING *data = NULL;
chain = SSL_get_peer_cert_chain(ssl);
if (chain == NULL)
return;
for (i = 0; i < sk_X509_num(chain); i++) {
cert_rec = tls_cert_create_rec();
// Subject.
name = X509_get_subject_name(sk_X509_value(chain, i));
for (j = 0; j < X509_NAME_entry_count(name); j++) {
entry = X509_NAME_get_entry(name, j);
nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(entry));
key = (char *)OBJ_nid2sn(nid);
if (key == NULL)
key = (char *)OBJ_nid2ln(nid);
data = X509_NAME_ENTRY_get_data(entry);
value = (char *)ASN1_STRING_data(data);
tls_cert_entry_rec = tls_cert_entry_create_rec(key, value);
tls_cert_rec_append_subject_entry(cert_rec, tls_cert_entry_rec);
}
// Issuer.
name = X509_get_issuer_name(sk_X509_value(chain, i));
for (j = 0; j < X509_NAME_entry_count(name); j++) {
entry = X509_NAME_get_entry(name, j);
nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(entry));
key = (char *)OBJ_nid2sn(nid);
if (key == NULL)
key = (char *)OBJ_nid2ln(nid);
data = X509_NAME_ENTRY_get_data(entry);
value = (char *)ASN1_STRING_data(data);
tls_cert_entry_rec = tls_cert_entry_create_rec(key, value);
tls_cert_rec_append_issuer_entry(cert_rec, tls_cert_entry_rec);
}
tls_rec_append_cert(tls, cert_rec);
}
}
static void set_server_temporary_key_info(TLS_REC *tls, SSL *ssl)
{
g_return_if_fail(tls != NULL);
g_return_if_fail(ssl != NULL);
#ifdef SSL_get_server_tmp_key
// Show ephemeral key information.
EVP_PKEY *ephemeral_key = NULL;
// OPENSSL_NO_EC is for solaris 11.3 (2016), github ticket #598
#ifndef OPENSSL_NO_EC
EC_KEY *ec_key = NULL;
#endif
char *ephemeral_key_algorithm = NULL;
char *cname = NULL;
int nid;
if (SSL_get_server_tmp_key(ssl, &ephemeral_key)) {
switch (EVP_PKEY_id(ephemeral_key)) {
case EVP_PKEY_DH:
tls_rec_set_ephemeral_key_algorithm(tls, "DH");
tls_rec_set_ephemeral_key_size(tls, EVP_PKEY_bits(ephemeral_key));
break;
#ifndef OPENSSL_NO_EC
case EVP_PKEY_EC:
ec_key = EVP_PKEY_get1_EC_KEY(ephemeral_key);
nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key));
EC_KEY_free(ec_key);
cname = (char *)OBJ_nid2sn(nid);
ephemeral_key_algorithm = g_strdup_printf("ECDH: %s", cname);
tls_rec_set_ephemeral_key_algorithm(tls, ephemeral_key_algorithm);
tls_rec_set_ephemeral_key_size(tls, EVP_PKEY_bits(ephemeral_key));
g_free_and_null(ephemeral_key_algorithm);
break;
#endif
default:
tls_rec_set_ephemeral_key_algorithm(tls, "Unknown");
tls_rec_set_ephemeral_key_size(tls, EVP_PKEY_bits(ephemeral_key));
break;
}
EVP_PKEY_free(ephemeral_key);
}
#endif // SSL_get_server_tmp_key.
}
GIOChannel *net_connect_ip_ssl(IPADDR *ip, int port, IPADDR *my_ip, SERVER_REC *server)
{
GIOChannel *handle, *ssl_handle;
handle = net_connect_ip(ip, port, my_ip);
if (handle == NULL)
return NULL;
ssl_handle = irssi_ssl_get_iochannel(handle, port, server);
if (ssl_handle == NULL)
g_io_channel_unref(handle);
return ssl_handle;
}
GIOChannel *net_start_ssl(SERVER_REC *server)
{
GIOChannel *handle, *ssl_handle;
g_return_val_if_fail(server != NULL, NULL);
handle = net_sendbuffer_handle(server->handle);
if (handle == NULL)
return NULL;
ssl_handle = irssi_ssl_get_iochannel(handle, server->connrec->port, server);
return ssl_handle;
}
int irssi_ssl_handshake(GIOChannel *handle)
{
GIOSSLChannel *chan = (GIOSSLChannel *)handle;
int ret, err;
const char *errstr = NULL;
X509 *cert = NULL;
X509_PUBKEY *pubkey = NULL;
int pubkey_size = 0;
unsigned char *pubkey_der = NULL;
unsigned char *pubkey_der_tmp = NULL;
unsigned char pubkey_fingerprint[EVP_MAX_MD_SIZE];
unsigned int pubkey_fingerprint_size;
unsigned char cert_fingerprint[EVP_MAX_MD_SIZE];
unsigned int cert_fingerprint_size;
const char *pinned_cert_fingerprint = chan->server->connrec->tls_pinned_cert;
const char *pinned_pubkey_fingerprint = chan->server->connrec->tls_pinned_pubkey;
TLS_REC *tls = NULL;
ERR_clear_error();
ret = SSL_connect(chan->ssl);
if (ret <= 0) {
err = SSL_get_error(chan->ssl, ret);
switch (err) {
case SSL_ERROR_WANT_READ:
return 1;
case SSL_ERROR_WANT_WRITE:
return 3;
case SSL_ERROR_ZERO_RETURN:
g_warning("SSL handshake failed: %s", "server closed connection");
return -1;
case SSL_ERROR_SYSCALL:
errstr = ERR_reason_error_string(ERR_get_error());
if (errstr == NULL && ret == -1)
errstr = strerror(errno);
g_warning("SSL handshake failed: %s", errstr != NULL ? errstr : "server closed connection unexpectedly");
return -1;
default:
errstr = ERR_reason_error_string(ERR_get_error());
g_warning("SSL handshake failed: %s", errstr != NULL ? errstr : "unknown SSL error");
return -1;
}
}
cert = SSL_get_peer_certificate(chan->ssl);
pubkey = X509_get_X509_PUBKEY(cert);
if (cert == NULL) {
g_warning("TLS server supplied no certificate");
ret = 0;
goto done;
}
if (pubkey == NULL) {
g_warning("TLS server supplied no certificate public key");
ret = 0;
goto done;
}
if (! X509_digest(cert, EVP_sha256(), cert_fingerprint, &cert_fingerprint_size)) {
g_warning("Unable to generate certificate fingerprint");
ret = 0;
goto done;
}
pubkey_size = i2d_X509_PUBKEY(pubkey, NULL);
pubkey_der = pubkey_der_tmp = g_new(unsigned char, pubkey_size);
i2d_X509_PUBKEY(pubkey, &pubkey_der_tmp);
EVP_Digest(pubkey_der, pubkey_size, pubkey_fingerprint, &pubkey_fingerprint_size, EVP_sha256(), 0);
tls = tls_create_rec();
set_cipher_info(tls, chan->ssl);
set_pubkey_info(tls, cert, cert_fingerprint, cert_fingerprint_size, pubkey_fingerprint, pubkey_fingerprint_size);
set_peer_cert_chain_info(tls, chan->ssl);
set_server_temporary_key_info(tls, chan->ssl);
// Emit the TLS rec.
signal_emit("tls handshake finished", 2, chan->server, tls);
ret = 1;
if (pinned_cert_fingerprint != NULL && pinned_cert_fingerprint[0] != '\0') {
ret = g_ascii_strcasecmp(pinned_cert_fingerprint, tls->certificate_fingerprint) == 0;
if (! ret) {
g_warning(" Pinned certificate mismatch");
goto done;
}
}
if (pinned_pubkey_fingerprint != NULL && pinned_pubkey_fingerprint[0] != '\0') {
ret = g_ascii_strcasecmp(pinned_pubkey_fingerprint, tls->public_key_fingerprint) == 0;
if (! ret) {
g_warning(" Pinned public key mismatch");
goto done;
}
}
if (chan->verify) {
ret = irssi_ssl_verify(chan->ssl, chan->ctx, chan->server->connrec->address, chan->port, cert, chan->server, tls);
if (! ret) {
// irssi_ssl_verify emits a warning itself.
goto done;
}
}
done:
tls_rec_free(tls);
X509_free(cert);
g_free(pubkey_der);
return ret ? 0 : -1;
}
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