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622 lines (526 loc) · 15.8 KB
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* Author: David Woodhouse <[email protected]>
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef _WIN32
#include <sys/wait.h>
#endif
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include "openconnect-internal.h"
int script_setenv(struct openconnect_info *vpninfo,
const char *opt, const char *val, int trunc, int append)
{
struct oc_vpn_option *p;
char *str;
for (p = vpninfo->script_env; p; p = p->next) {
if (!strcmp(opt, p->option)) {
if (append) {
if (asprintf(&str, "%s %s", p->value, val) == -1)
return -ENOMEM;
} else
str = val ? strdup(val) : NULL;
free (p->value);
p->value = str;
return 0;
}
}
p = malloc(sizeof(*p));
if (!p)
return -ENOMEM;
p->next = vpninfo->script_env;
p->option = strdup(opt);
p->value = val ? (trunc ? strndup(val, trunc) : strdup(val)) : NULL;
vpninfo->script_env = p;
return 0;
}
int script_setenv_int(struct openconnect_info *vpninfo, const char *opt, int value)
{
char buf[16];
sprintf(buf, "%d", value);
return script_setenv(vpninfo, opt, buf, 0, 0);
}
static int netmasklen(struct in_addr addr)
{
int masklen;
for (masklen = 0; masklen < 32; masklen++) {
if (ntohl(addr.s_addr) >= (0xffffffff << masklen))
break;
}
return 32 - masklen;
}
static uint32_t netmaskbits(int masklen)
{
if (masklen)
return htonl(0xffffffff << (32-masklen));
else /* Shifting by 32 is invalid, so special-case it */
return 0;
}
static int process_split_xxclude(struct openconnect_info *vpninfo,
int include, const char *route, int *v4_incs,
int *v6_incs)
{
struct in_addr net_addr, mask_addr;
const char *in_ex = include ? "IN" : "EX";
char envname[80], uptoslash[20];
const char *slash;
char *endp;
int masklen;
slash = strchr(route, '/');
envname[79] = uptoslash[19] = 0;
if (strchr(route, ':')) {
snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_ADDR", in_ex,
*v6_incs);
script_setenv(vpninfo, envname, route, slash ? slash - route : 0, 0);
snprintf(envname, 79, "CISCO_IPV6_SPLIT_%sC_%d_MASKLEN", in_ex,
*v6_incs);
script_setenv(vpninfo, envname, slash ? slash + 1 : "128", 0, 0);
(*v6_incs)++;
return 0;
}
if (!slash)
strncpy(uptoslash, route, sizeof(uptoslash)-1);
else {
int l = MIN(slash - route, sizeof(uptoslash)-1);
strncpy(uptoslash, route, l);
uptoslash[l] = 0;
}
/* Network address must be parseable */
if (!inet_aton(uptoslash, &net_addr)) {
bad:
if (include)
vpn_progress(vpninfo, PRG_ERR,
_("Discard bad split include: \"%s\"\n"),
route);
else
vpn_progress(vpninfo, PRG_ERR,
_("Discard bad split exclude: \"%s\"\n"),
route);
return -EINVAL;
}
/* Accept netmask in several forms */
if (!slash) {
/* no mask (same as /32) */
masklen = 32;
mask_addr.s_addr = netmaskbits(32);
} else if ((masklen = strtol(slash+1, &endp, 10))<=32 && *endp!='.') {
/* mask is /N */
mask_addr.s_addr = netmaskbits(masklen);
} else if (inet_aton(slash+1, &mask_addr)) {
/* mask is /A.B.C.D */
masklen = netmasklen(mask_addr);
/* something invalid like /255.0.0.1 */
if (netmaskbits(masklen) != mask_addr.s_addr)
goto bad;
} else
goto bad;
/* Fix incorrectly-set host bits */
if (net_addr.s_addr & ~mask_addr.s_addr) {
net_addr.s_addr &= mask_addr.s_addr;
if (include)
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: Split include \"%s\" has host bits set, replacing with \"%s/%d\".\n"),
route, inet_ntoa(net_addr), masklen);
else
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: Split exclude \"%s\" has host bits set, replacing with \"%s/%d\".\n"),
route, inet_ntoa(net_addr), masklen);
}
snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_ADDR", in_ex, *v4_incs);
script_setenv(vpninfo, envname, inet_ntoa(net_addr), 0, 0);
snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASK", in_ex, *v4_incs);
script_setenv(vpninfo, envname, inet_ntoa(mask_addr), 0, 0);
snprintf(envname, 79, "CISCO_SPLIT_%sC_%d_MASKLEN", in_ex, *v4_incs);
script_setenv_int(vpninfo, envname, masklen);
(*v4_incs)++;
return 0;
}
static void setenv_cstp_opts(struct openconnect_info *vpninfo)
{
char *env_buf;
int buflen = 0;
int bufofs = 0;
struct oc_vpn_option *opt;
for (opt = vpninfo->cstp_options; opt; opt = opt->next)
buflen += 2 + strlen(opt->option) + strlen(opt->value);
env_buf = malloc(buflen + 1);
if (!env_buf)
return;
env_buf[buflen] = 0;
for (opt = vpninfo->cstp_options; opt; opt = opt->next)
bufofs += snprintf(env_buf + bufofs, buflen - bufofs,
"%s=%s\n", opt->option, opt->value);
script_setenv(vpninfo, "CISCO_CSTP_OPTIONS", env_buf, 0, 0);
free(env_buf);
}
static unsigned char nybble(unsigned char n)
{
if (n >= '0' && n <= '9') return n - '0';
else if (n >= 'A' && n <= 'F') return n - ('A' - 10);
else if (n >= 'a' && n <= 'f') return n - ('a' - 10);
return 0;
}
unsigned char unhex(const char *data)
{
return (nybble(data[0]) << 4) | nybble(data[1]);
}
static void set_banner(struct openconnect_info *vpninfo)
{
char *banner, *legacy_banner, *q;
const char *p;
if (!vpninfo->banner || !(banner = malloc(strlen(vpninfo->banner)+1))) {
script_setenv(vpninfo, "CISCO_BANNER", NULL, 0, 0);
return;
}
p = vpninfo->banner;
q = banner;
while (*p) {
if (*p == '%' && isxdigit((int)(unsigned char)p[1]) &&
isxdigit((int)(unsigned char)p[2])) {
*(q++) = unhex(p + 1);
p += 3;
} else
*(q++) = *(p++);
}
*q = 0;
legacy_banner = openconnect_utf8_to_legacy(vpninfo, banner);
script_setenv(vpninfo, "CISCO_BANNER", legacy_banner, 0, 0);
if (legacy_banner != banner)
free(legacy_banner);
free(banner);
}
void prepare_script_env(struct openconnect_info *vpninfo)
{
if (vpninfo->ip_info.gateway_addr)
script_setenv(vpninfo, "VPNGATEWAY", vpninfo->ip_info.gateway_addr, 0, 0);
set_banner(vpninfo);
script_setenv(vpninfo, "CISCO_SPLIT_INC", NULL, 0, 0);
script_setenv(vpninfo, "CISCO_SPLIT_EXC", NULL, 0, 0);
script_setenv_int(vpninfo, "INTERNAL_IP4_MTU", vpninfo->ip_info.mtu);
if (vpninfo->idle_timeout)
script_setenv_int(vpninfo, "IDLE_TIMEOUT", vpninfo->idle_timeout);
else
script_setenv(vpninfo, "IDLE_TIMEOUT", NULL, 0, 0);
if (vpninfo->ip_info.addr) {
script_setenv(vpninfo, "INTERNAL_IP4_ADDRESS", vpninfo->ip_info.addr, 0, 0);
if (vpninfo->ip_info.netmask) {
struct in_addr addr;
struct in_addr mask;
if (!inet_aton(vpninfo->ip_info.addr, &addr))
vpn_progress(vpninfo, PRG_ERR,
_("Ignoring legacy network because address \"%s\" is invalid.\n"),
vpninfo->ip_info.addr);
else if (!inet_aton(vpninfo->ip_info.netmask, &mask))
bad_netmask:
vpn_progress(vpninfo, PRG_ERR,
_("Ignoring legacy network because netmask \"%s\" is invalid.\n"),
vpninfo->ip_info.netmask);
else {
char *netaddr;
int masklen = netmasklen(mask);
if (netmaskbits(masklen) != mask.s_addr)
goto bad_netmask;
addr.s_addr &= mask.s_addr;
netaddr = inet_ntoa(addr);
script_setenv(vpninfo, "INTERNAL_IP4_NETADDR", netaddr, 0, 0);
script_setenv(vpninfo, "INTERNAL_IP4_NETMASK", vpninfo->ip_info.netmask, 0, 0);
script_setenv_int(vpninfo, "INTERNAL_IP4_NETMASKLEN", masklen);
}
}
}
if (vpninfo->ip_info.addr6) {
script_setenv(vpninfo, "INTERNAL_IP6_ADDRESS", vpninfo->ip_info.addr6, 0, 0);
script_setenv(vpninfo, "INTERNAL_IP6_NETMASK", vpninfo->ip_info.netmask6, 0, 0);
} else if (vpninfo->ip_info.netmask6) {
char *slash = strchr(vpninfo->ip_info.netmask6, '/');
script_setenv(vpninfo, "INTERNAL_IP6_NETMASK", vpninfo->ip_info.netmask6, 0, 0);
if (slash)
script_setenv(vpninfo, "INTERNAL_IP6_ADDRESS", vpninfo->ip_info.netmask6,
slash - vpninfo->ip_info.netmask6, 0);
}
if (vpninfo->ip_info.dns[0])
script_setenv(vpninfo, "INTERNAL_IP4_DNS", vpninfo->ip_info.dns[0], 0, 0);
else
script_setenv(vpninfo, "INTERNAL_IP4_DNS", NULL, 0, 0);
if (vpninfo->ip_info.dns[1])
script_setenv(vpninfo, "INTERNAL_IP4_DNS", vpninfo->ip_info.dns[1], 0, 1);
if (vpninfo->ip_info.dns[2])
script_setenv(vpninfo, "INTERNAL_IP4_DNS", vpninfo->ip_info.dns[2], 0, 1);
if (vpninfo->ip_info.nbns[0])
script_setenv(vpninfo, "INTERNAL_IP4_NBNS", vpninfo->ip_info.nbns[0], 0, 0);
else
script_setenv(vpninfo, "INTERNAL_IP4_NBNS", NULL, 0, 0);
if (vpninfo->ip_info.nbns[1])
script_setenv(vpninfo, "INTERNAL_IP4_NBNS", vpninfo->ip_info.nbns[1], 0, 1);
if (vpninfo->ip_info.nbns[2])
script_setenv(vpninfo, "INTERNAL_IP4_NBNS", vpninfo->ip_info.nbns[2], 0, 1);
if (vpninfo->ip_info.domain)
script_setenv(vpninfo, "CISCO_DEF_DOMAIN", vpninfo->ip_info.domain, 0, 0);
else
script_setenv(vpninfo, "CISCO_DEF_DOMAIN", NULL, 0, 0);
if (vpninfo->ip_info.proxy_pac)
script_setenv(vpninfo, "CISCO_PROXY_PAC", vpninfo->ip_info.proxy_pac, 0, 0);
if (vpninfo->ip_info.split_dns) {
char *list;
int len = 0;
struct oc_split_include *dns = vpninfo->ip_info.split_dns;
while (dns) {
len += strlen(dns->route) + 1;
dns = dns->next;
}
list = malloc(len);
if (list) {
char *p = list;
dns = vpninfo->ip_info.split_dns;
while (1) {
strcpy(p, dns->route);
p += strlen(p);
dns = dns->next;
if (!dns)
break;
*(p++) = ',';
}
script_setenv(vpninfo, "CISCO_SPLIT_DNS", list, 0, 0);
free(list);
}
}
if (vpninfo->ip_info.split_includes) {
struct oc_split_include *this = vpninfo->ip_info.split_includes;
int nr_split_includes = 0;
int nr_v6_split_includes = 0;
while (this) {
process_split_xxclude(vpninfo, 1, this->route,
&nr_split_includes,
&nr_v6_split_includes);
this = this->next;
}
if (nr_split_includes)
script_setenv_int(vpninfo, "CISCO_SPLIT_INC", nr_split_includes);
if (nr_v6_split_includes)
script_setenv_int(vpninfo, "CISCO_IPV6_SPLIT_INC", nr_v6_split_includes);
}
if (vpninfo->ip_info.split_excludes) {
struct oc_split_include *this = vpninfo->ip_info.split_excludes;
int nr_split_excludes = 0;
int nr_v6_split_excludes = 0;
while (this) {
process_split_xxclude(vpninfo, 0, this->route,
&nr_split_excludes,
&nr_v6_split_excludes);
this = this->next;
}
if (nr_split_excludes)
script_setenv_int(vpninfo, "CISCO_SPLIT_EXC", nr_split_excludes);
if (nr_v6_split_excludes)
script_setenv_int(vpninfo, "CISCO_IPV6_SPLIT_EXC", nr_v6_split_excludes);
}
setenv_cstp_opts(vpninfo);
}
void free_split_routes(struct openconnect_info *vpninfo)
{
struct oc_split_include *inc;
for (inc = vpninfo->ip_info.split_includes; inc; ) {
struct oc_split_include *next = inc->next;
free(inc);
inc = next;
}
for (inc = vpninfo->ip_info.split_excludes; inc; ) {
struct oc_split_include *next = inc->next;
free(inc);
inc = next;
}
for (inc = vpninfo->ip_info.split_dns; inc; ) {
struct oc_split_include *next = inc->next;
free(inc);
inc = next;
}
vpninfo->ip_info.split_dns = vpninfo->ip_info.split_includes =
vpninfo->ip_info.split_excludes = NULL;
}
#ifdef _WIN32
static wchar_t *create_script_env(struct openconnect_info *vpninfo)
{
struct oc_vpn_option *opt;
struct oc_text_buf *envbuf;
wchar_t **oldenv, **p, *newenv = NULL;
int nr_envs = 0, i;
/* _wenviron is NULL until we call _wgetenv() */
(void)_wgetenv(L"PATH");
/* Take a copy of _wenviron (but not of its strings) */
for (p = _wenviron; *p; p++)
nr_envs++;
oldenv = malloc(nr_envs * sizeof(*oldenv));
if (!oldenv)
return NULL;
memcpy(oldenv, _wenviron, nr_envs * sizeof(*oldenv));
envbuf = buf_alloc();
/* Add the script environment variables, prodding out any members of
oldenv which are obsoleted by them. */
for (opt = vpninfo->script_env; opt && !buf_error(envbuf); opt = opt->next) {
struct oc_text_buf *buf;
buf = buf_alloc();
buf_append_utf16le(buf, opt->option);
buf_append_utf16le(buf, "=");
if (buf_error(buf)) {
buf_free(buf);
goto err;
}
/* See if we can find it in the existing environment */
for (i = 0; i < nr_envs; i++) {
if (oldenv[i] &&
!wcsncmp((wchar_t *)buf->data, oldenv[i], buf->pos / 2)) {
oldenv[i] = NULL;
break;
}
}
if (opt->value) {
buf_append_bytes(envbuf, buf->data, buf->pos);
buf_append_utf16le(envbuf, opt->value);
buf_append_bytes(envbuf, "\0\0", 2);
}
buf_free(buf);
}
for (i = 0; i < nr_envs && !buf_error(envbuf); i++) {
if (oldenv[i])
buf_append_bytes(envbuf, oldenv[i],
(wcslen(oldenv[i]) + 1) * sizeof(wchar_t));
}
buf_append_bytes(envbuf, "\0\0", 2);
if (!buf_error(envbuf)) {
newenv = (wchar_t *)envbuf->data;
envbuf->data = NULL;
}
err:
free(oldenv);
buf_free(envbuf);
return newenv;
}
int script_config_tun(struct openconnect_info *vpninfo, const char *reason)
{
wchar_t *script_w;
wchar_t *script_env;
int nr_chars;
int ret;
char *cmd;
PROCESS_INFORMATION pi;
STARTUPINFOW si;
DWORD cpflags;
if (!vpninfo->vpnc_script || vpninfo->script_tun)
return 0;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
/* probably superfluous */
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
script_setenv(vpninfo, "reason", reason, 0, 0);
if (asprintf(&cmd, "cscript.exe \"%s\"", vpninfo->vpnc_script) == -1)
return 0;
nr_chars = MultiByteToWideChar(CP_UTF8, 0, cmd, -1, NULL, 0);
script_w = malloc(nr_chars * sizeof(wchar_t));
if (!script_w) {
free(cmd);
return -ENOMEM;
}
MultiByteToWideChar(CP_UTF8, 0, cmd, -1, script_w, nr_chars);
free(cmd);
script_env = create_script_env(vpninfo);
cpflags = CREATE_UNICODE_ENVIRONMENT;
/* If we're running from a console, let the script use it too. */
if (!GetConsoleWindow())
cpflags |= CREATE_NO_WINDOW;
if (CreateProcessW(NULL, script_w, NULL, NULL, FALSE, cpflags,
script_env, NULL, &si, &pi)) {
ret = WaitForSingleObject(pi.hProcess,10000);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
if (ret == WAIT_TIMEOUT)
ret = -ETIMEDOUT;
else
ret = 0;
} else {
ret = -EIO;
}
free(script_env);
if (ret < 0) {
char *errstr = openconnect__win32_strerror(GetLastError());
vpn_progress(vpninfo, PRG_ERR,
_("Failed to spawn script '%s' for %s: %s\n"),
vpninfo->vpnc_script, reason, errstr);
free(errstr);
goto cleanup;
}
cleanup:
free(script_w);
return ret;
}
#else
/* Must only be run after fork(). */
int apply_script_env(struct oc_vpn_option *envs)
{
struct oc_vpn_option *p;
for (p = envs; p; p = p->next) {
if (p->value)
setenv(p->option, p->value, 1);
else
unsetenv(p->option);
}
return 0;
}
int script_config_tun(struct openconnect_info *vpninfo, const char *reason)
{
int ret;
pid_t pid;
if (!vpninfo->vpnc_script || vpninfo->script_tun)
return 0;
pid = fork();
if (!pid) {
/* Child */
char *script = openconnect_utf8_to_legacy(vpninfo, vpninfo->vpnc_script);
apply_script_env(vpninfo->script_env);
setenv("reason", reason, 1);
execl("/bin/sh", "/bin/sh", "-c", script, NULL);
exit(127);
}
if (pid == -1 || waitpid(pid, &ret, 0) == -1) {
int e = errno;
vpn_progress(vpninfo, PRG_ERR,
_("Failed to spawn script '%s' for %s: %s\n"),
vpninfo->vpnc_script, reason, strerror(e));
return -e;
}
if (!WIFEXITED(ret)) {
vpn_progress(vpninfo, PRG_ERR,
_("Script '%s' exited abnormally (%x)\n"),
vpninfo->vpnc_script, ret);
return -EIO;
}
ret = WEXITSTATUS(ret);
if (ret) {
vpn_progress(vpninfo, PRG_ERR,
_("Script '%s' returned error %d\n"),
vpninfo->vpnc_script, ret);
return -EIO;
}
return 0;
}
#endif