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library.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
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* Copyright © 2008-2012 Intel Corporation.
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*
* Authors: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to:
*
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#ifdef LIBSTOKEN_HDR
#include LIBSTOKEN_HDR
#endif
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#include <libxml/tree.h>
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#include "openconnect-internal.h"
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struct openconnect_info *openconnect_vpninfo_new (char *useragent,
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openconnect_validate_peer_cert_vfn validate_peer_cert,
openconnect_write_new_config_vfn write_new_config,
openconnect_process_auth_form_vfn process_auth_form,
openconnect_progress_vfn progress,
void *privdata)
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{
struct openconnect_info *vpninfo = calloc (sizeof(*vpninfo), 1);
vpninfo->ssl_fd = -1;
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vpninfo->cert_expire_warning = 60 * 86400;
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vpninfo->useragent = openconnect_create_useragent (useragent);
vpninfo->validate_peer_cert = validate_peer_cert;
vpninfo->write_new_config = write_new_config;
vpninfo->process_auth_form = process_auth_form;
vpninfo->progress = progress;
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vpninfo->cbdata = privdata?:vpninfo;
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vpninfo->cancel_fd = -1;
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openconnect_set_reported_os(vpninfo, NULL);
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#ifdef ENABLE_NLS
bindtextdomain("openconnect", LOCALEDIR);
#endif
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return vpninfo;
}
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int openconnect_set_reported_os (struct openconnect_info *vpninfo, const char *os)
{
if (!os) {
#if defined(__APPLE__)
os = "mac";
#else
os = sizeof(long) > 4 ? "linux-64" : "linux";
#endif
}
/* FIXME: is there a special platname for 64-bit Windows? */
if (!strcmp(os, "mac"))
vpninfo->csd_xmltag = "csdMac";
else if (!strcmp(os, "linux") || !strcmp(os, "linux-64"))
vpninfo->csd_xmltag = "csdLinux";
else if (!strcmp(os, "win"))
vpninfo->csd_xmltag = "csd";
else
return -EINVAL;
vpninfo->platname = os;
return 0;
}
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static void free_optlist (struct vpn_option *opt)
{
struct vpn_option *next;
for (; opt; opt = next) {
next = opt->next;
free(opt->option);
free(opt->value);
free(opt);
}
}
void openconnect_vpninfo_free (struct openconnect_info *vpninfo)
{
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openconnect_close_https(vpninfo, 1);
free(vpninfo->peer_addr);
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free_optlist(vpninfo->cookies);
free_optlist(vpninfo->cstp_options);
free_optlist(vpninfo->dtls_options);
free(vpninfo->hostname);
free(vpninfo->urlpath);
free(vpninfo->redirect_url);
free(vpninfo->proxy_type);
free(vpninfo->proxy);
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if (vpninfo->csd_scriptname) {
unlink(vpninfo->csd_scriptname);
free(vpninfo->csd_scriptname);
}
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free(vpninfo->csd_token);
free(vpninfo->csd_ticket);
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free(vpninfo->csd_stuburl);
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free(vpninfo->csd_starturl);
free(vpninfo->csd_waiturl);
free(vpninfo->csd_preurl);
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if (vpninfo->opaque_srvdata)
xmlFreeNode(vpninfo->opaque_srvdata);
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/* These are const in openconnect itself, but for consistency of
the library API we do take ownership of the strings we're given,
and thus we have to free them too. */
free((void *)vpninfo->cafile);
if (vpninfo->cert != vpninfo->sslkey)
free((void *)vpninfo->sslkey);
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free((void *)vpninfo->cert);
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if (vpninfo->peer_cert) {
#if defined (OPENCONNECT_OPENSSL)
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X509_free(vpninfo->peer_cert);
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#elif defined (OPENCONNECT_GNUTLS)
gnutls_x509_crt_deinit(vpninfo->peer_cert);
#endif
vpninfo->peer_cert = NULL;
}
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free(vpninfo->useragent);
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#ifdef LIBSTOKEN_HDR
if (vpninfo->stoken_pin)
free(vpninfo->stoken_pin);
if (vpninfo->stoken_ctx)
stoken_destroy(vpninfo->stoken_ctx);
#endif
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/* No need to free deflate streams; they weren't initialised */
free(vpninfo);
}
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char *openconnect_get_hostname (struct openconnect_info *vpninfo)
{
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return vpninfo->unique_hostname?:vpninfo->hostname;
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}
void openconnect_set_hostname (struct openconnect_info *vpninfo, char *hostname)
{
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free(vpninfo->hostname);
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vpninfo->hostname = hostname;
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free(vpninfo->unique_hostname);
vpninfo->unique_hostname = NULL;
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}
char *openconnect_get_urlpath (struct openconnect_info *vpninfo)
{
return vpninfo->urlpath;
}
void openconnect_set_urlpath (struct openconnect_info *vpninfo, char *urlpath)
{
vpninfo->urlpath = urlpath;
}
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void openconnect_set_xmlsha1 (struct openconnect_info *vpninfo, const char *xmlsha1, int size)
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{
if (size != sizeof (vpninfo->xmlsha1))
return;
memcpy (&vpninfo->xmlsha1, xmlsha1, size);
}
void openconnect_set_cafile (struct openconnect_info *vpninfo, char *cafile)
{
vpninfo->cafile = cafile;
}
void openconnect_setup_csd (struct openconnect_info *vpninfo, uid_t uid, int silent, char *wrapper)
{
vpninfo->uid_csd = uid;
vpninfo->uid_csd_given = silent?2:1;
vpninfo->csd_wrapper = wrapper;
}
void openconnect_set_client_cert (struct openconnect_info *vpninfo, char *cert, char *sslkey)
{
vpninfo->cert = cert;
if (sslkey)
vpninfo->sslkey = sslkey;
else
vpninfo->sslkey = cert;
}
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OPENCONNECT_X509 *openconnect_get_peer_cert (struct openconnect_info *vpninfo)
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{
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return vpninfo->peer_cert;
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}
int openconnect_get_port (struct openconnect_info *vpninfo)
{
return vpninfo->port;
}
char *openconnect_get_cookie (struct openconnect_info *vpninfo)
{
return vpninfo->cookie;
}
void openconnect_clear_cookie (struct openconnect_info *vpninfo)
{
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if (vpninfo->cookie)
memset(vpninfo->cookie, 0, strlen(vpninfo->cookie));
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}
void openconnect_reset_ssl (struct openconnect_info *vpninfo)
{
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openconnect_close_https(vpninfo, 0);
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if (vpninfo->peer_addr) {
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free(vpninfo->peer_addr);
vpninfo->peer_addr = NULL;
}
}
int openconnect_parse_url (struct openconnect_info *vpninfo, char *url)
{
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char *scheme = NULL;
int ret;
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if (vpninfo->peer_addr) {
free(vpninfo->peer_addr);
vpninfo->peer_addr = NULL;
}
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free(vpninfo->hostname);
vpninfo->hostname = NULL;
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free(vpninfo->unique_hostname);
vpninfo->unique_hostname = NULL;
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free(vpninfo->urlpath);
vpninfo->urlpath = NULL;
ret = internal_parse_url (url, &scheme, &vpninfo->hostname,
&vpninfo->port, &vpninfo->urlpath, 443);
if (ret) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse server URL '%s'\n"),
url);
return ret;
}
if (scheme && strcmp(scheme, "https")) {
vpn_progress(vpninfo, PRG_ERR,
_("Only https:// permitted for server URL\n"));
ret = -EINVAL;
}
free(scheme);
return ret;
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}
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void openconnect_set_cert_expiry_warning (struct openconnect_info *vpninfo,
int seconds)
{
vpninfo->cert_expire_warning = seconds;
}
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void openconnect_set_cancel_fd (struct openconnect_info *vpninfo, int fd)
{
vpninfo->cancel_fd = fd;
}
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const char *openconnect_get_version (void)
{
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return openconnect_version_str;
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}
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int openconnect_has_pkcs11_support(void)
{
#if defined (OPENCONNECT_GNUTLS) && defined (HAVE_P11KIT)
return 1;
#else
return 0;
#endif
}
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#if defined (OPENCONNECT_OPENSSL) && defined (HAVE_ENGINE)
#include <openssl/engine.h>
#endif
int openconnect_has_tss_blob_support(void)
{
#if defined (OPENCONNECT_OPENSSL) && defined (HAVE_ENGINE)
ENGINE *e;
ENGINE_load_builtin_engines();
e = ENGINE_by_id("tpm");
if (e) {
ENGINE_free(e);
return 1;
}
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#elif defined (OPENCONNECT_GNUTLS) && defined (HAVE_TROUSERS)
return 1;
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#endif
return 0;
}
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int openconnect_has_stoken_support(void)
{
#ifdef LIBSTOKEN_HDR
return 1;
#else
return 0;
#endif
}
/*
* Enable software token generation if use_stoken == 1.
*
* If token_str is not NULL, try to parse the string. Otherwise, try to read
* the token data from ~/.stokenrc
*
* Return value:
* = -EOPNOTSUPP, if libstoken is not available
* = -EINVAL, if the token string is invalid (token_str was provided)
* = -ENOENT, if ~/.stokenrc is missing (token_str was NULL)
* = -EIO, for other libstoken failures
* = 0, on success
*/
int openconnect_set_stoken_mode (struct openconnect_info *vpninfo,
int use_stoken, const char *token_str)
{
#ifdef LIBSTOKEN_HDR
int ret;
vpninfo->use_stoken = 0;
if (!use_stoken)
return 0;
if (!vpninfo->stoken_ctx) {
vpninfo->stoken_ctx = stoken_new();
if (!vpninfo->stoken_ctx)
return -EIO;
}
ret = token_str ?
stoken_import_string(vpninfo->stoken_ctx, token_str) :
stoken_import_rcfile(vpninfo->stoken_ctx, NULL);
if (ret)
return ret;
vpninfo->use_stoken = 1;
return 0;
#else
return -EOPNOTSUPP;
#endif
}