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auth-juniper.c
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auth-juniper.c
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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.
*/
/*
* Grateful thanks to Tiebing Zhang, who did much of the hard work
* of analysing and decoding the protocol.
*/
#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 <sys/types.h>
#ifndef _WIN32
#include <sys/wait.h>
#endif
#include <libxml/HTMLparser.h>
#include <libxml/HTMLtree.h>
#include "openconnect-internal.h"
/* XX: This is actually a lot of duplication with the CSTP version. */
void oncp_common_headers(struct openconnect_info *vpninfo, struct oc_text_buf *buf)
{
http_common_headers(vpninfo, buf);
// buf_append(buf, "Content-Length: 256\r\n");
buf_append(buf, "NCP-Version: 3\r\n");
// buf_append(buf, "Accept-Encoding: gzip\r\n");
}
static xmlNodePtr htmlnode_next(xmlNodePtr top, xmlNodePtr node)
{
if (node->children)
return node->children;
while (!node->next) {
node = node->parent;
if (!node || node == top)
return NULL;
}
return node->next;
}
static int oncp_can_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form,
struct oc_form_opt *opt)
{
if (vpninfo->token_mode == OC_TOKEN_MODE_NONE ||
vpninfo->token_bypassed)
return -EINVAL;
if (strcmp(form->auth_id, "frmDefender") &&
strcmp(form->auth_id, "frmNextToken") &&
strcmp(form->auth_id, "frmTotpToken"))
return -EINVAL;
return can_gen_tokencode(vpninfo, form, opt);
}
static int parse_input_node(struct openconnect_info *vpninfo, struct oc_auth_form *form,
xmlNodePtr node, const char *submit_button)
{
char *type = (char *)xmlGetProp(node, (unsigned char *)"type");
struct oc_form_opt **p = &form->opts;
struct oc_form_opt *opt;
int ret = 0;
if (!type)
return -EINVAL;
opt = calloc(1, sizeof(*opt));
if (!opt) {
ret = -ENOMEM;
goto out;
}
if (!strcasecmp(type, "hidden")) {
opt->type = OC_FORM_OPT_HIDDEN;
xmlnode_get_prop(node, "name", &opt->name);
xmlnode_get_prop(node, "value", &opt->_value);
/* XXX: Handle tz_offset / tz */
} else if (!strcasecmp(type, "password")) {
opt->type = OC_FORM_OPT_PASSWORD;
xmlnode_get_prop(node, "name", &opt->name);
if (asprintf(&opt->label, "%s:", opt->name) == -1) {
ret = -ENOMEM;
goto out;
}
if (!oncp_can_gen_tokencode(vpninfo, form, opt))
opt->type = OC_FORM_OPT_TOKEN;
} else if (!strcasecmp(type, "text")) {
opt->type = OC_FORM_OPT_TEXT;
xmlnode_get_prop(node, "name", &opt->name);
if (asprintf(&opt->label, "%s:", opt->name) == -1) {
ret = -ENOMEM;
goto out;
}
} else if (!strcasecmp(type, "username")) {
opt->type = OC_FORM_OPT_TEXT;
xmlnode_get_prop(node, "name", &opt->name);
if (asprintf(&opt->label, "%s:", opt->name) == -1) {
ret = -ENOMEM;
goto out;
}
} else if (!strcasecmp(type, "submit")) {
xmlnode_get_prop(node, "name", &opt->name);
if (opt->name && (!strcmp(opt->name, submit_button) ||
!strcmp(opt->name, "sn-postauth-proceed") ||
!strcmp(opt->name, "sn-preauth-proceed"))) {
/* Use this as the 'Submit' action for the form, by
implicitly adding it as a hidden option. */
xmlnode_get_prop(node, "value", &opt->_value);
opt->type = OC_FORM_OPT_HIDDEN;
} else {
vpn_progress(vpninfo, PRG_DEBUG,
_("Ignoring unknown form submit item '%s'\n"),
opt->name);
ret = -EINVAL;
goto out;
}
} else if (!strcasecmp(type, "checkbox")) {
opt->type = OC_FORM_OPT_HIDDEN;
xmlnode_get_prop(node, "name", &opt->name);
xmlnode_get_prop(node, "value", &opt->_value);
} else {
vpn_progress(vpninfo, PRG_DEBUG,
_("Ignoring unknown form input type '%s'\n"),
type);
ret = -EINVAL;
goto out;
}
/* Append to the existing list */
while (*p) {
if (!strcmp((*p)->name, opt->name)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("Discarding duplicate option '%s'\n"),
opt->name);
goto out;
}
p = &(*p)->next;
}
*p = opt;
out:
if (ret)
free_opt(opt);
free(type);
return ret;
}
static int parse_select_node(struct openconnect_info *vpninfo, struct oc_auth_form *form,
xmlNodePtr node)
{
xmlNodePtr child;
struct oc_form_opt_select *opt;
struct oc_choice *choice;
opt = calloc(1, sizeof(*opt));
if (!opt)
return -ENOMEM;
xmlnode_get_prop(node, "name", &opt->form.name);
opt->form.label = strdup(opt->form.name);
opt->form.type = OC_FORM_OPT_SELECT;
if (!strcmp(opt->form.name, "realm"))
form->authgroup_opt = opt;
for (child = node->children; child; child = child->next) {
struct oc_choice **new_choices;
if (!child->name || strcasecmp((const char *)child->name, "option"))
continue;
choice = calloc(1, sizeof(*choice));
if (!choice)
return -ENOMEM;
xmlnode_get_prop(node, "name", &choice->name);
choice->label = (char *)xmlNodeGetContent(child);
choice->name = strdup(choice->label);
new_choices = realloc(opt->choices, sizeof(opt->choices[0]) * (opt->nr_choices+1));
if (!new_choices) {
free_opt((void *)opt);
free(choice);
return -ENOMEM;
}
opt->choices = new_choices;
opt->choices[opt->nr_choices++] = choice;
}
/* Prepend to the existing list */
opt->form.next = form->opts;
form->opts = &opt->form;
return 0;
}
static struct oc_auth_form *parse_form_node(struct openconnect_info *vpninfo,
xmlNodePtr node, const char *submit_button)
{
struct oc_auth_form *form = calloc(1, sizeof(*form));
xmlNodePtr child;
if (!form)
return NULL;
xmlnode_get_prop(node, "method", &form->method);
xmlnode_get_prop(node, "action", &form->action);
if (!form->method || strcasecmp(form->method, "POST") ||
!form->action || !form->action[0]) {
vpn_progress(vpninfo, PRG_ERR,
_("Cannot handle form method='%s', action='%s'\n"),
form->method, form->action);
free(form);
return NULL;
}
xmlnode_get_prop(node, "name", &form->auth_id);
form->banner = strdup(form->auth_id);
for (child = htmlnode_next(node, node); child && child != node; child = htmlnode_next(node, child)) {
if (!child->name)
continue;
if (!strcasecmp((char *)child->name, "input"))
parse_input_node(vpninfo, form, child, submit_button);
else if (!strcasecmp((char *)child->name, "select")) {
parse_select_node(vpninfo, form, child);
/* Skip its children */
while (child->children)
child = child->last;
} else if (!strcasecmp((char *)child->name, "textarea")) {
/* display the post sign-in message, if any */
char *fieldname = (char *)xmlGetProp(child, (unsigned char *)"name");
if (fieldname && (!strcasecmp(fieldname, "sn-postauth-text") ||
!strcasecmp(fieldname, "sn-preauth-text"))) {
char *postauth_msg = (char *)xmlNodeGetContent(child);
if (postauth_msg) {
free(form->banner);
form->banner = postauth_msg;
}
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Unknown textarea field: '%s'\n"), fieldname);
}
free(fieldname);
}
}
return form;
}
static xmlNodePtr find_form_node(xmlDocPtr doc)
{
xmlNodePtr root, node;
for (root = node = xmlDocGetRootElement(doc); node; node = htmlnode_next(root, node)) {
if (node->name && !strcasecmp((char *)node->name, "form"))
return node;
}
return NULL;
}
static int check_cookie_success(struct openconnect_info *vpninfo)
{
const char *dslast = NULL, *dsfirst = NULL, *dsurl = NULL, *dsid = NULL;
struct oc_vpn_option *cookie;
struct oc_text_buf *buf;
for (cookie = vpninfo->cookies; cookie; cookie = cookie->next) {
if (!strcmp(cookie->option, "DSFirstAccess"))
dsfirst = cookie->value;
else if (!strcmp(cookie->option, "DSLastAccess"))
dslast = cookie->value;
else if (!strcmp(cookie->option, "DSID"))
dsid = cookie->value;
else if (!strcmp(cookie->option, "DSSignInUrl"))
dsurl = cookie->value;
}
if (!dsid)
return -ENOENT;
buf = buf_alloc();
if (vpninfo->tncc_fd != -1) {
buf_append(buf, "setcookie\n");
buf_append(buf, "Cookie=%s\n", dsid);
if (buf_error(buf))
return buf_free(buf);
send(vpninfo->tncc_fd, buf->data, buf->pos, 0);
buf_truncate(buf);
}
/* XXX: Do these need escaping? Could they theoreetically have semicolons in? */
buf_append(buf, "DSID=%s", dsid);
if (dsfirst)
buf_append(buf, "; DSFirst=%s", dsfirst);
if (dslast)
buf_append(buf, "; DSLast=%s", dslast);
if (dsurl)
buf_append(buf, "; DSSignInUrl=%s", dsurl);
if (buf_error(buf))
return buf_free(buf);
free(vpninfo->cookie);
vpninfo->cookie = buf->data;
buf->data = NULL;
buf_free(buf);
return 0;
}
#ifdef _WIN32
static int tncc_preauth(struct openconnect_info *vpninfo)
{
vpn_progress(vpninfo, PRG_ERR,
_("TNCC support not implemented yet on Windows\n"));
return -EOPNOTSUPP;
}
#else
static int tncc_preauth(struct openconnect_info *vpninfo)
{
int sockfd[2];
pid_t pid;
struct oc_text_buf *buf;
struct oc_vpn_option *cookie;
const char *dspreauth = NULL, *dssignin = "null";
char recvbuf[1024], *p;
int len;
for (cookie = vpninfo->cookies; cookie; cookie = cookie->next) {
if (!strcmp(cookie->option, "DSPREAUTH"))
dspreauth = cookie->value;
else if (!strcmp(cookie->option, "DSSIGNIN"))
dssignin = cookie->value;
}
if (!dspreauth) {
vpn_progress(vpninfo, PRG_ERR,
_("No DSPREAUTH cookie; not attempting TNCC\n"));
return -EINVAL;
}
buf = buf_alloc();
buf_append(buf, "start\n");
buf_append(buf, "IC=%s\n", vpninfo->hostname);
buf_append(buf, "Cookie=%s\n", dspreauth);
buf_append(buf, "DSSIGNIN=%s\n", dssignin);
if (buf_error(buf)) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to allocate memory for communication with TNCC\n"));
return buf_free(buf);
}
#ifdef SOCK_CLOEXEC
if (socketpair(AF_UNIX, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockfd))
#endif
{
if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockfd)) {
buf_free(buf);
return -errno;
}
set_fd_cloexec(sockfd[0]);
set_fd_cloexec(sockfd[1]);
}
pid = fork();
if (pid == -1) {
buf_free(buf);
return -errno;
}
if (!pid) {
int i;
/* Fork again to detach grandchild */
if (fork())
exit(1);
close(sockfd[1]);
/* The duplicated fd does not have O_CLOEXEC */
dup2(sockfd[0], 0);
/* We really don't want anything going to stdout */
dup2(1, 2);
for (i = 3; i < 1024 ; i++)
close(i);
execl(vpninfo->csd_wrapper, vpninfo->csd_wrapper, vpninfo->hostname, NULL);
fprintf(stderr, _("Failed to exec TNCC script %s: %s\n"),
vpninfo->csd_wrapper, strerror(errno));
exit(1);
}
waitpid(pid, NULL, 0);
close(sockfd[0]);
if (send(sockfd[1], buf->data, buf->pos, 0) != buf->pos) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to send start command to TNCC\n"));
buf_free(buf);
close(sockfd[1]);
return -EIO;
}
buf_free(buf);
vpn_progress(vpninfo, PRG_DEBUG,
_("Sent start; waiting for response from TNCC\n"));
len = recv(sockfd[1], recvbuf, sizeof(recvbuf) - 1, 0);
if (len < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to read response from TNCC\n"));
close(sockfd[1]);
return -EIO;
}
recvbuf[len] = 0;
p = strchr(recvbuf, '\n');
if (!p) {
invalid_response:
vpn_progress(vpninfo, PRG_ERR,
_("Received invalid response from TNCC\n"));
print_response:
vpn_progress(vpninfo, PRG_TRACE, _("TNCC response: -->\n%s\n<--\n"),
recvbuf);
close(sockfd[1]);
return -EINVAL;
}
*p = 0;
if (strcmp(recvbuf, "200")) {
vpn_progress(vpninfo, PRG_ERR,
_("Received unsuccessful %s response from TNCC\n"),
recvbuf);
goto print_response;
}
p = strchr(p + 1, '\n');
if (!p)
goto invalid_response;
dspreauth = p + 1;
p = strchr(p + 1, '\n');
if (!p)
goto invalid_response;
*p = 0;
vpn_progress(vpninfo, PRG_DEBUG,
_("Got new DSPREAUTH cookie from TNCC: %s\n"),
dspreauth);
http_add_cookie(vpninfo, "DSPREAUTH", dspreauth, 1);
vpninfo->tncc_fd = sockfd[1];
return 0;
}
#endif
static struct oc_auth_form *parse_roles_table_node(xmlNodePtr node)
{
struct oc_auth_form *form;
xmlNodePtr table_itr;
xmlNodePtr row_itr;
xmlNodePtr data_itr;
struct oc_form_opt_select *opt;
struct oc_choice *choice;
form = calloc(1, sizeof(*form));
if (!form)
return NULL;
opt = calloc(1, sizeof(*opt));
if (!opt) {
free(form);
return NULL;
}
form->opts = &opt->form;
opt->form.label = strdup("frmSelectRoles");
opt->form.name = strdup("frmSelectRoles");
opt->form.type = OC_FORM_OPT_SELECT;
for (table_itr = node->children; table_itr; table_itr = table_itr->next) {
if (!table_itr->name || strcasecmp((const char *)table_itr->name, "tr"))
continue;
for (row_itr = table_itr->children; row_itr; row_itr = row_itr->next) {
if (!row_itr->name || strcasecmp((const char *)row_itr->name, "td"))
continue;
for (data_itr = row_itr->children; data_itr; data_itr = data_itr->next) {
struct oc_choice **new_choices;
char *role_link = NULL;
char *role_name = NULL;
if (!data_itr->name || strcasecmp((const char *)data_itr->name, "a"))
continue;
// Discovered <a> tag with role selection.
role_link = (char *)xmlGetProp(data_itr, (unsigned char *)"href");
if (!role_link)
continue;
role_name = (char *)xmlNodeGetContent(data_itr);
if (!role_name) {
// some weird case?
free(role_link);
continue;
}
choice = calloc(1, sizeof(*choice));
if (!choice) {
free(role_name);
free(role_link);
free_auth_form(form);
return NULL;
}
choice->label = role_name;
choice->name = role_link;
new_choices = realloc(opt->choices, sizeof(opt->choices[0]) * (opt->nr_choices+1));
if (!new_choices) {
free(choice);
free(role_name);
free(role_link);
free_auth_form(form);
return NULL;
}
opt->choices = new_choices;
opt->choices[opt->nr_choices++] = choice;
}
}
}
return form;
}
static struct oc_auth_form *parse_roles_form_node(xmlNodePtr node)
{
struct oc_auth_form *form = NULL;
xmlNodePtr child;
// Set form->action here as a redirect url with keys and ids.
for (child = htmlnode_next(node, node); child && child != node;
child = htmlnode_next(node, child)) {
if (child->name && !strcasecmp((char *)child->name, "table")) {
char *table_id = (char *)xmlGetProp(child, (unsigned char *)"id");
if (table_id) {
if (!strcmp(table_id, "TABLE_SelectRole_1"))
form = parse_roles_table_node(child);
free(table_id);
if (form)
break;
}
}
}
return form;
}
int oncp_obtain_cookie(struct openconnect_info *vpninfo)
{
int ret;
struct oc_text_buf *resp_buf = NULL;
xmlDocPtr doc = NULL;
xmlNodePtr node;
struct oc_auth_form *form = NULL;
char *form_id = NULL;
int try_tncc = !!vpninfo->csd_wrapper;
resp_buf = buf_alloc();
if (buf_error(resp_buf))
return -ENOMEM;
while (1) {
char *form_buf = NULL;
int role_select = 0;
struct oc_text_buf *url;
if (resp_buf && resp_buf->pos)
ret = do_https_request(vpninfo, "POST",
"application/x-www-form-urlencoded",
resp_buf, &form_buf, 2);
else
ret = do_https_request(vpninfo, "GET", NULL, NULL,
&form_buf, 2);
if (ret < 0)
break;
url = buf_alloc();
buf_append(url, "https://%s", vpninfo->hostname);
if (vpninfo->port != 443)
buf_append(url, ":%d", vpninfo->port);
buf_append(url, "/");
if (vpninfo->urlpath)
buf_append(url, "%s", vpninfo->urlpath);
if (buf_error(url)) {
free(form_buf);
ret = buf_free(url);
break;
}
if (!check_cookie_success(vpninfo)) {
buf_free(url);
free(form_buf);
ret = 0;
break;
}
doc = htmlReadMemory(form_buf, ret, url->data, NULL,
HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING|HTML_PARSE_NONET);
buf_free(url);
free(form_buf);
if (!doc) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse HTML document\n"));
ret = -EINVAL;
break;
}
buf_truncate(resp_buf);
node = find_form_node(doc);
if (!node) {
if (try_tncc) {
try_tncc = 0;
ret = tncc_preauth(vpninfo);
if (ret)
return ret;
goto tncc_done;
}
vpn_progress(vpninfo, PRG_ERR,
_("Failed to find or parse web form in login page\n"));
ret = -EINVAL;
break;
}
free(form_id);
form_id = (char *)xmlGetProp(node, (unsigned char *)"name");
if (!form_id) {
vpn_progress(vpninfo, PRG_ERR,
_("Encountered form with no ID\n"));
goto dump_form;
} else if (!strcmp(form_id, "frmLogin")) {
form = parse_form_node(vpninfo, node, "btnSubmit");
if (!form) {
ret = -EINVAL;
break;
}
} else if (!strcmp(form_id, "frmDefender") ||
!strcmp(form_id, "frmNextToken")) {
form = parse_form_node(vpninfo, node, "btnAction");
if (!form) {
ret = -EINVAL;
break;
}
} else if (!strcmp(form_id, "frmConfirmation")) {
form = parse_form_node(vpninfo, node, "btnContinue");
if (!form) {
ret = -EINVAL;
break;
}
/* XXX: Actually ask the user? */
goto form_done;
} else if (!strcmp(form_id, "frmSelectRoles")) {
form = parse_roles_form_node(node);
if (!form) {
ret = -EINVAL;
break;
}
role_select = 1;
} else if (!strcmp(form_id, "frmTotpToken")) {
form = parse_form_node(vpninfo, node, "totpactionEnter");
if (!form) {
ret = -EINVAL;
break;
}
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Unknown form ID '%s'\n"),
form_id);
dump_form:
fprintf(stderr, _("Dumping unknown HTML form:\n"));
htmlNodeDumpFileFormat(stderr, node->doc, node, NULL, 1);
ret = -EINVAL;
break;
}
do {
ret = process_auth_form(vpninfo, form);
} while (ret == OC_FORM_RESULT_NEWGROUP);
if (ret)
goto out;
ret = do_gen_tokencode(vpninfo, form);
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Failed to generate OTP tokencode; disabling token\n"));
vpninfo->token_bypassed = 1;
goto out;
}
/* frmSelectRoles is special; it's actually *links*, not a form. So
* we need to process it differently... */
if (role_select) {
vpninfo->redirect_url = strdup(form->opts[0]._value);
goto do_redirect;
}
form_done:
append_form_opts(vpninfo, form, resp_buf);
ret = buf_error(resp_buf);
if (ret)
break;
vpninfo->redirect_url = form->action;
form->action = NULL;
do_redirect:
free_auth_form(form);
form = NULL;
handle_redirect(vpninfo);
tncc_done:
xmlFreeDoc(doc);
doc = NULL;
}
out:
if (doc)
xmlFreeDoc(doc);
free(form_id);
if (form)
free_auth_form(form);
buf_free(resp_buf);
return ret;
}