auth-common.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* Author: 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.
*/
#include <config.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdarg.h>
#include "openconnect-internal.h"
int xmlnode_is_named(xmlNode *xml_node, const char *name)
{
return !strcmp((char *)xml_node->name, name);
}
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/* similar to auth.c's xmlnode_get_text, including that *var should be freed by the caller,
but without the hackish param / %s handling that Cisco needs. */
int xmlnode_get_val(xmlNode *xml_node, const char *name, char **var)
{
char *str;
if (name && !xmlnode_is_named(xml_node, name))
return -EINVAL;
str = (char *)xmlNodeGetContent(xml_node);
if (!str)
return -ENOENT;
free(*var);
*var = str;
return 0;
}
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int xmlnode_get_prop(xmlNode *xml_node, const char *name, char **var)
{
char *str = (char *)xmlGetProp(xml_node, (unsigned char *)name);
if (!str)
return -ENOENT;
free(*var);
*var = str;
return 0;
}
int xmlnode_match_prop(xmlNode *xml_node, const char *name, const char *match)
{
char *str = (char *)xmlGetProp(xml_node, (unsigned char *)name);
int ret = 0;
if (!str)
return -ENOENT;
if (strcmp(str, match))
ret = -EEXIST;
free(str);
return ret;
}
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int append_opt(struct oc_text_buf *body, const char *opt, const char *name)
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{
if (buf_error(body))
return buf_error(body);
if (body->pos)
buf_append(body, "&");
buf_append_urlencoded(body, opt);
buf_append(body, "=");
buf_append_urlencoded(body, name);
return 0;
}
int append_form_opts(struct openconnect_info *vpninfo,
struct oc_auth_form *form, struct oc_text_buf *body)
{
struct oc_form_opt *opt;
int ret;
for (opt = form->opts; opt; opt = opt->next) {
ret = append_opt(body, opt->name, opt->_value);
if (ret)
return ret;
}
return 0;
}
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void clear_mem(void *p, size_t s)
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{
#if defined(HAVE_MEMSET_S)
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memset_s(p, s, 0x5a, s);
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#elif defined(HAVE_EXPLICIT_MEMSET)
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explicit_memset(p, 0x5a, s);
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#elif defined(HAVE_EXPLICIT_BZERO)
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explicit_bzero(p, s);
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#elif defined(_WIN32)
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SecureZeroMemory(p, s);
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volatile char *pp = (volatile char *)p;
while (s--)
*(pp++) = 0x5a;
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}
void free_pass(char **p)
{
if (!*p)
return;
clear_mem(*p, strlen(*p));
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free(*p);
*p = NULL;
}
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void free_opt(struct oc_form_opt *opt)
{
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if (!opt)
return;
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/* for SELECT options, opt->value is a pointer to oc_choice->name */
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if (opt->type != OC_FORM_OPT_SELECT) {
free_pass(&opt->_value);
} else {
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struct oc_form_opt_select *sel = (void *)opt;
int i;
for (i = 0; i < sel->nr_choices; i++) {
free(sel->choices[i]->name);
free(sel->choices[i]->label);
free(sel->choices[i]->auth_type);
free(sel->choices[i]->override_name);
free(sel->choices[i]->override_label);
free(sel->choices[i]);
}
free(sel->choices);
}
free(opt->name);
free(opt->label);
free(opt);
}
void free_auth_form(struct oc_auth_form *form)
{
if (!form)
return;
while (form->opts) {
struct oc_form_opt *tmp = form->opts->next;
free_opt(form->opts);
form->opts = tmp;
}
free(form->error);
free(form->message);
free(form->banner);
free(form->auth_id);
free(form->method);
free(form->action);
free(form);
}
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/* Return value:
* < 0, if unable to generate a tokencode
* = 0, on success
*/
int do_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form)
{
struct oc_form_opt *opt;
for (opt = form->opts; ; opt = opt->next) {
/* this form might not have anything for us to do */
if (!opt)
return 0;
if (opt->type == OC_FORM_OPT_TOKEN)
break;
}
switch (vpninfo->token_mode) {
#ifdef HAVE_LIBSTOKEN
case OC_TOKEN_MODE_STOKEN:
return do_gen_stoken_code(vpninfo, form, opt);
#endif
case OC_TOKEN_MODE_TOTP:
return do_gen_totp_code(vpninfo, form, opt);
case OC_TOKEN_MODE_HOTP:
return do_gen_hotp_code(vpninfo, form, opt);
#ifdef HAVE_LIBPCSCLITE
case OC_TOKEN_MODE_YUBIOATH:
return do_gen_yubikey_code(vpninfo, form, opt);
#endif
default:
return -EINVAL;
}
}
int can_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form,
struct oc_form_opt *opt)
{
switch (vpninfo->token_mode) {
#ifdef HAVE_LIBSTOKEN
case OC_TOKEN_MODE_STOKEN:
return can_gen_stoken_code(vpninfo, form, opt);
#endif
case OC_TOKEN_MODE_TOTP:
return can_gen_totp_code(vpninfo, form, opt);
case OC_TOKEN_MODE_HOTP:
return can_gen_hotp_code(vpninfo, form, opt);
#ifdef HAVE_LIBPCSCLITE
case OC_TOKEN_MODE_YUBIOATH:
return can_gen_yubikey_code(vpninfo, form, opt);
#endif
default:
return -EINVAL;
}
}