/
auth.c
1513 lines (1298 loc) · 40.2 KB
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/*
* OpenConnect (SSL + DTLS) VPN client
*
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* Copyright © 2008-2015 Intel Corporation.
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* Copyright © 2013 John Morrissey <jwm@horde.net>
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*
* 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.
*/
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#include <config.h>
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#include <stdio.h>
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#include <unistd.h>
#include <fcntl.h>
#include <time.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/stat.h>
#include <sys/types.h>
#ifndef _WIN32
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#include <sys/wait.h>
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#include <pwd.h>
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#include <grp.h>
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#endif
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#include <libxml/parser.h>
#include <libxml/tree.h>
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#include "openconnect-internal.h"
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static int xmlpost_append_form_opts(struct openconnect_info *vpninfo,
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struct oc_auth_form *form, struct oc_text_buf *body);
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static int cstp_can_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form,
struct oc_form_opt *opt);
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int openconnect_set_option_value(struct oc_form_opt *opt, const char *value)
{
if (opt->type == OC_FORM_OPT_SELECT) {
struct oc_form_opt_select *sopt = (void *)opt;
int i;
for (i=0; i<sopt->nr_choices; i++) {
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if (!strcmp(value, sopt->choices[i]->name)) {
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opt->_value = sopt->choices[i]->name;
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return 0;
}
}
return -EINVAL;
}
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opt->_value = strdup(value);
if (!opt->_value)
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return -ENOMEM;
return 0;
}
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static int prop_equals(xmlNode *xml_node, const char *name, const char *value)
{
char *tmp = (char *)xmlGetProp(xml_node, (unsigned char *)name);
int ret = 0;
if (tmp && !strcasecmp(tmp, value))
ret = 1;
free(tmp);
return ret;
}
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static int parse_auth_choice(struct openconnect_info *vpninfo, struct oc_auth_form *form,
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xmlNode *xml_node)
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{
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struct oc_form_opt_select *opt;
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xmlNode *opt_node;
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int max_choices = 0, selection = 0;
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opt = calloc(1, sizeof(*opt));
if (!opt)
return -ENOMEM;
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opt->form.type = OC_FORM_OPT_SELECT;
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opt->form.name = (char *)xmlGetProp(xml_node, (unsigned char *)"name");
opt->form.label = (char *)xmlGetProp(xml_node, (unsigned char *)"label");
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if (!opt->form.name) {
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vpn_progress(vpninfo, PRG_ERR, _("Form choice has no name\n"));
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free_opt((struct oc_form_opt *)opt);
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return -EINVAL;
}
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for (opt_node = xml_node->children; opt_node; opt_node = opt_node->next)
max_choices++;
opt->choices = calloc(1, max_choices * sizeof(struct oc_choice *));
if (!opt->choices) {
free_opt((struct oc_form_opt *)opt);
return -ENOMEM;
}
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for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
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char *form_id;
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struct oc_choice *choice;
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if (xml_node->type != XML_ELEMENT_NODE)
continue;
if (strcmp((char *)xml_node->name, "option"))
continue;
form_id = (char *)xmlGetProp(xml_node, (unsigned char *)"value");
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if (!form_id)
form_id = (char *)xmlNodeGetContent(xml_node);
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if (!form_id)
continue;
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choice = calloc(1, sizeof(*choice));
if (!choice) {
free_opt((struct oc_form_opt *)opt);
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return -ENOMEM;
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}
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choice->name = form_id;
choice->label = (char *)xmlNodeGetContent(xml_node);
choice->auth_type = (char *)xmlGetProp(xml_node, (unsigned char *)"auth-type");
choice->override_name = (char *)xmlGetProp(xml_node, (unsigned char *)"override-name");
choice->override_label = (char *)xmlGetProp(xml_node, (unsigned char *)"override-label");
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choice->second_auth = prop_equals(xml_node, "second-auth", "1");
choice->secondary_username = (char *)xmlGetProp(xml_node,
(unsigned char *)"secondary_username");
choice->secondary_username_editable = prop_equals(xml_node,
"secondary_username_editable", "true");
choice->noaaa = prop_equals(xml_node, "noaaa", "1");
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if (prop_equals(xml_node, "selected", "true"))
selection = opt->nr_choices;
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opt->choices[opt->nr_choices++] = choice;
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}
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if (!strcmp(opt->form.name, "group_list")) {
form->authgroup_opt = opt;
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form->authgroup_selection = selection;
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}
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/* We link the choice _first_ so it's at the top of what we present
to the user */
opt->form.next = form->opts;
form->opts = &opt->form;
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return 0;
}
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static int parse_form(struct openconnect_info *vpninfo, struct oc_auth_form *form,
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xmlNode *xml_node)
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{
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char *input_type, *input_name, *input_label;
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for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
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struct oc_form_opt *opt, **p;
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if (xml_node->type != XML_ELEMENT_NODE)
continue;
if (!strcmp((char *)xml_node->name, "select")) {
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if (parse_auth_choice(vpninfo, form, xml_node))
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return -EINVAL;
continue;
}
if (strcmp((char *)xml_node->name, "input")) {
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vpn_progress(vpninfo, PRG_DEBUG,
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_("name %s not input\n"), xml_node->name);
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continue;
}
input_type = (char *)xmlGetProp(xml_node, (unsigned char *)"type");
if (!input_type) {
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vpn_progress(vpninfo, PRG_INFO,
_("No input type in form\n"));
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continue;
}
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if (!strcmp(input_type, "submit") || !strcmp(input_type, "reset")) {
free(input_type);
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continue;
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}
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input_name = (char *)xmlGetProp(xml_node, (unsigned char *)"name");
if (!input_name) {
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vpn_progress(vpninfo, PRG_INFO,
_("No input name in form\n"));
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free(input_type);
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continue;
}
input_label = (char *)xmlGetProp(xml_node, (unsigned char *)"label");
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opt = calloc(1, sizeof(*opt));
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if (!opt) {
free(input_type);
free(input_name);
free(input_label);
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return -ENOMEM;
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}
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opt->name = input_name;
opt->label = input_label;
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opt->flags = prop_equals(xml_node, "second-auth", "1") ? OC_FORM_OPT_SECOND_AUTH : 0;
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if (!strcmp(input_type, "hidden")) {
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opt->type = OC_FORM_OPT_HIDDEN;
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opt->_value = (char *)xmlGetProp(xml_node, (unsigned char *)"value");
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} else if (!strcmp(input_type, "text")) {
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opt->type = OC_FORM_OPT_TEXT;
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} else if (!strcmp(input_type, "password")) {
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if (!cstp_can_gen_tokencode(vpninfo, form, opt))
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opt->type = OC_FORM_OPT_TOKEN;
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else
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opt->type = OC_FORM_OPT_PASSWORD;
} else {
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vpn_progress(vpninfo, PRG_INFO,
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_("Unknown input type %s in form\n"),
input_type);
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free(input_type);
free(input_name);
free(input_label);
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free(opt);
continue;
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}
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free(input_type);
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p = &form->opts;
while (*p)
p = &(*p)->next;
*p = opt;
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}
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return 0;
}
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static char *xmlnode_msg(xmlNode *xml_node)
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{
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char *fmt = (char *)xmlNodeGetContent(xml_node);
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char *result, *params[2], *pct;
int len;
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int nr_params = 0;
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if (!fmt || !fmt[0]) {
free(fmt);
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return NULL;
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}
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len = strlen(fmt) + 1;
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params[0] = (char *)xmlGetProp(xml_node, (unsigned char *)"param1");
if (params[0])
len += strlen(params[0]);
params[1] = (char *)xmlGetProp(xml_node, (unsigned char *)"param2");
if (params[1])
len += strlen(params[1]);
result = malloc(len);
if (!result) {
result = fmt;
goto out;
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}
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strcpy(result, fmt);
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free(fmt);
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for (pct = strchr(result, '%'); pct;
(pct = strchr(pct, '%'))) {
int paramlen;
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/* We only cope with '%s' */
if (pct[1] != 's')
goto out;
if (params[nr_params]) {
paramlen = strlen(params[nr_params]);
/* Move rest of fmt string up... */
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memmove(pct + paramlen, pct + 2, strlen(pct + 2) + 1);
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/* ... and put the string parameter in where the '%s' was */
memcpy(pct, params[nr_params], paramlen);
pct += paramlen;
} else
pct++;
if (++nr_params == 2)
break;
}
out:
free(params[0]);
free(params[1]);
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return result;
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}
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static int xmlnode_get_text(xmlNode *xml_node, const char *name, char **var)
{
char *str;
if (name && !xmlnode_is_named(xml_node, name))
return -EINVAL;
str = xmlnode_msg(xml_node);
if (!str)
return -ENOENT;
free(*var);
*var = str;
return 0;
}
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/*
* Legacy server response looks like:
*
* <auth id="<!-- "main" for initial attempt, "success" means we have a cookie -->">
* <title><!-- title to display to user --></title>
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* <csd
* token="<!-- save to vpninfo->csd_token -->"
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* ticket="<!-- save to vpninfo->csd_ticket -->" />
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* <csd
* stuburl="<!-- save to vpninfo->csd_stuburl if --os=win -->"
* starturl="<!-- save to vpninfo->csd_starturl if --os=win -->"
* waiturl="<!-- save to vpninfo->csd_starturl if --os=win -->"
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* <csdMac
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* stuburl="<!-- save to vpninfo->csd_stuburl if --os=mac-intel -->"
* starturl="<!-- save to vpninfo->csd_starturl if --os=mac-intel -->"
* waiturl="<!-- save to vpninfo->csd_waiturl if --os=mac-intel -->" />
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* <csdLinux
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* stuburl="<!-- same as above, for Linux -->"
* starturl="<!-- same as above, for Linux -->"
* waiturl="<!-- same as above, for Linux -->" />
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* <banner><!-- display this to the user --></banner>
* <message>Please enter your username and password.</message>
* <form method="post" action="/+webvpn+/index.html">
* <input type="text" name="username" label="Username:" />
* <input type="password" name="password" label="Password:" />
* <input type="hidden" name="<!-- save these -->" value="<!-- ... -->" />
* <input type="submit" name="Login" value="Login" />
* <input type="reset" name="Clear" value="Clear" />
* </form>
* </auth>
*
* New server response looks like:
*
* <config-auth>
* <version><!-- whatever --></version>
* <session-token><!-- if present, save to vpninfo->cookie --></session-token>
* <opaque>
* <!-- this could contain anything; copy to vpninfo->opaque_srvdata -->
* <tunnel-group>foobar</tunnel-group>
* <config-hash>1234567</config-hash>
* </opaque>
* <auth id="<!-- see above -->
* <!-- all of our old familiar fields -->
* </auth>
* <host-scan>
* <host-scan-ticket><!-- save to vpninfo->csd_ticket --></host-scan-ticket>
* <host-scan-token><!-- save to vpninfo->csd_token --></host-scan-token>
* <host-scan-base-uri><!-- save to vpninfo->csd_starturl --></host-scan-base-uri>
* <host-scan-wait-uri><!-- save to vpninfo->csd_waiturl --></host-scan-wait-uri>
* </host-scan>
* </config-auth>
*
* Notes:
*
* 1) The new host-scan-*-uri nodes do not map directly to the old CSD fields.
*
* 2) The new <form> tag tends to omit the method/action properties.
*/
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static int parse_auth_node(struct openconnect_info *vpninfo, xmlNode *xml_node,
struct oc_auth_form *form)
{
int ret = 0;
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
if (xml_node->type != XML_ELEMENT_NODE)
continue;
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xmlnode_get_text(xml_node, "banner", &form->banner);
xmlnode_get_text(xml_node, "message", &form->message);
xmlnode_get_text(xml_node, "error", &form->error);
if (xmlnode_is_named(xml_node, "form")) {
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/* defaults for new XML POST */
form->method = strdup("POST");
form->action = strdup("/");
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xmlnode_get_prop(xml_node, "method", &form->method);
xmlnode_get_prop(xml_node, "action", &form->action);
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if (!form->method || !form->action ||
strcasecmp(form->method, "POST") || !form->action[0]) {
vpn_progress(vpninfo, PRG_ERR,
_("Cannot handle form method='%s', action='%s'\n"),
form->method, form->action);
ret = -EINVAL;
goto out;
}
ret = parse_form(vpninfo, form, xml_node);
if (ret < 0)
goto out;
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} else if (!vpninfo->csd_scriptname && xmlnode_is_named(xml_node, "csd")) {
xmlnode_get_prop(xml_node, "token", &vpninfo->csd_token);
xmlnode_get_prop(xml_node, "ticket", &vpninfo->csd_ticket);
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} else if (xmlnode_is_named(xml_node, "authentication-complete")) {
/* Ick. Since struct oc_auth_form is public there's no
* simple way to add a flag to it. So let's abuse the
* auth_id string instead. */
free(form->auth_id);
form->auth_id = strdup("openconnect_authentication_complete");
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}
/* For Windows, vpninfo->csd_xmltag will be "csd" and there are *two* <csd>
nodes; one with token/ticket and one with the URLs. Process them both
the same and rely on the fact that xmlnode_get_prop() will not *clear*
the variable if no such property is found. */
if (!vpninfo->csd_scriptname && xmlnode_is_named(xml_node, vpninfo->csd_xmltag)) {
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/* ignore the CSD trojan binary on mobile platforms */
if (!vpninfo->csd_nostub)
xmlnode_get_prop(xml_node, "stuburl", &vpninfo->csd_stuburl);
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xmlnode_get_prop(xml_node, "starturl", &vpninfo->csd_starturl);
xmlnode_get_prop(xml_node, "waiturl", &vpninfo->csd_waiturl);
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vpninfo->csd_preurl = strdup(vpninfo->urlpath);
}
}
out:
return ret;
}
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static int parse_host_scan_node(struct openconnect_info *vpninfo, xmlNode *xml_node)
{
/* ignore this whole section if the CSD trojan has already run */
if (vpninfo->csd_scriptname)
return 0;
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
if (xml_node->type != XML_ELEMENT_NODE)
continue;
xmlnode_get_text(xml_node, "host-scan-ticket", &vpninfo->csd_ticket);
xmlnode_get_text(xml_node, "host-scan-token", &vpninfo->csd_token);
xmlnode_get_text(xml_node, "host-scan-base-uri", &vpninfo->csd_starturl);
xmlnode_get_text(xml_node, "host-scan-wait-uri", &vpninfo->csd_waiturl);
}
return 0;
}
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static void parse_profile_node(struct openconnect_info *vpninfo, xmlNode *xml_node)
{
/* ignore this whole section if we already have a URL */
if (vpninfo->profile_url && vpninfo->profile_sha1)
return;
/* Find <vpn rev="1.0"> child... */
xml_node = xml_node->children;
while (1) {
if (!xml_node)
return;
if (xml_node->type == XML_ELEMENT_NODE &&
xmlnode_is_named(xml_node, "vpn") &&
!xmlnode_match_prop(xml_node, "rev", "1.0"))
break;
xml_node = xml_node->next;
}
/* Find <file type="profile" service-type="user"> */
xml_node = xml_node->children;
while (1) {
if (!xml_node)
return;
if (xml_node->type == XML_ELEMENT_NODE &&
xmlnode_is_named(xml_node, "file") &&
!xmlnode_match_prop(xml_node, "type", "profile") &&
!xmlnode_match_prop(xml_node, "service-type", "user"))
break;
xml_node = xml_node->next;
}
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
if (xml_node->type != XML_ELEMENT_NODE)
continue;
xmlnode_get_text(xml_node, "uri", &vpninfo->profile_url);
/* FIXME: Check for <hash type="sha1"> */
xmlnode_get_text(xml_node, "hash", &vpninfo->profile_sha1);
}
}
static void parse_config_node(struct openconnect_info *vpninfo, xmlNode *xml_node)
{
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
if (xml_node->type != XML_ELEMENT_NODE)
continue;
if (xmlnode_is_named(xml_node, "vpn-profile-manifest"))
parse_profile_node(vpninfo, xml_node);
}
}
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/* Return value:
* < 0, on error
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* = 0, on success; *form is populated
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*/
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static int parse_xml_response(struct openconnect_info *vpninfo, char *response,
struct oc_auth_form **formp, int *cert_rq)
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{
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struct oc_auth_form *form;
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xmlDocPtr xml_doc;
xmlNode *xml_node;
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int ret;
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if (*formp) {
free_auth_form(*formp);
*formp = NULL;
}
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if (cert_rq)
*cert_rq = 0;
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if (!response) {
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vpn_progress(vpninfo, PRG_DEBUG,
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_("Empty response from server\n"));
return -EINVAL;
}
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form = calloc(1, sizeof(*form));
if (!form)
return -ENOMEM;
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xml_doc = xmlReadMemory(response, strlen(response), "noname.xml", NULL,
XML_PARSE_NOERROR|XML_PARSE_RECOVER);
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if (!xml_doc) {
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vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse server response\n"));
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vpn_progress(vpninfo, PRG_DEBUG,
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_("Response was:%s\n"), response);
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free(form);
return -EINVAL;
}
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xml_node = xmlDocGetRootElement(xml_doc);
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while (xml_node) {
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ret = 0;
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if (xml_node->type != XML_ELEMENT_NODE) {
xml_node = xml_node->next;
continue;
}
if (xmlnode_is_named(xml_node, "config-auth")) {
/* if we do have a config-auth node, it is the root element */
xml_node = xml_node->children;
continue;
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} else if (xmlnode_is_named(xml_node, "client-cert-request")) {
if (cert_rq)
*cert_rq = 1;
else {
vpn_progress(vpninfo, PRG_ERR,
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_("Received <client-cert-request> when not expected.\n"));
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ret = -EINVAL;
}
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} else if (xmlnode_is_named(xml_node, "auth")) {
xmlnode_get_prop(xml_node, "id", &form->auth_id);
ret = parse_auth_node(vpninfo, xml_node, form);
} else if (xmlnode_is_named(xml_node, "opaque")) {
if (vpninfo->opaque_srvdata)
xmlFreeNode(vpninfo->opaque_srvdata);
vpninfo->opaque_srvdata = xmlCopyNode(xml_node, 1);
if (!vpninfo->opaque_srvdata)
ret = -ENOMEM;
} else if (xmlnode_is_named(xml_node, "host-scan")) {
ret = parse_host_scan_node(vpninfo, xml_node);
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} else if (xmlnode_is_named(xml_node, "config")) {
parse_config_node(vpninfo, xml_node);
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599
600
} else {
xmlnode_get_text(xml_node, "session-token", &vpninfo->cookie);
xmlnode_get_text(xml_node, "error", &form->error);
}
if (ret)
goto out;
xml_node = xml_node->next;
}
601
if (!form->auth_id && (!cert_rq || !*cert_rq)) {
602
vpn_progress(vpninfo, PRG_ERR,
603
_("XML response has no \"auth\" node\n"));
604
ret = -EINVAL;
605
606
goto out;
}
607
608
609
610
*formp = form;
xmlFreeDoc(xml_doc);
return 0;
611
612
613
614
out:
xmlFreeDoc(xml_doc);
free_auth_form(form);
615
return ret;
616
617
618
619
}
/* Return value:
* < 0, on error
620
621
622
* = OC_FORM_RESULT_OK (0), when form parsed and POST required
* = OC_FORM_RESULT_CANCELLED, when response was cancelled by user
* = OC_FORM_RESULT_LOGGEDIN, when form indicates that login was already successful
623
*/
624
625
626
static int handle_auth_form(struct openconnect_info *vpninfo, struct oc_auth_form *form,
struct oc_text_buf *request_body, const char **method,
const char **request_body_type)
627
628
{
int ret;
629
struct oc_vpn_option *opt, *next;
630
631
if (!strcmp(form->auth_id, "success"))
632
return OC_FORM_RESULT_LOGGEDIN;
633
634
if (vpninfo->nopasswd) {
635
636
vpn_progress(vpninfo, PRG_ERR,
_("Asked for password but '--no-passwd' set\n"));
637
return -EPERM;
638
639
}
640
if (vpninfo->csd_token && vpninfo->csd_ticket && vpninfo->csd_starturl && vpninfo->csd_waiturl) {
641
642
643
644
645
646
647
648
649
/* AB: remove all cookies */
for (opt = vpninfo->cookies; opt; opt = next) {
next = opt->next;
free(opt->option);
free(opt->value);
free(opt);
}
vpninfo->cookies = NULL;
650
return OC_FORM_RESULT_OK;
651
}
652
if (!form->opts) {
653
if (form->message)
654
vpn_progress(vpninfo, PRG_INFO, "%s\n", form->message);
655
if (form->error)
656
vpn_progress(vpninfo, PRG_ERR, "%s\n", form->error);
657
658
if (!strcmp(form->auth_id, "openconnect_authentication_complete"))
goto justpost;
659
return -EPERM;
660
661
}
662
ret = process_auth_form(vpninfo, form);
663
if (ret)
664
return ret;
665
666
667
/* tokencode generation is deferred until after username prompts and CSD */
ret = do_gen_tokencode(vpninfo, form);
668
669
670
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Failed to generate OTP tokencode; disabling token\n"));
vpninfo->token_bypassed = 1;
671
return ret;
672
}
673
justpost:
674
ret = vpninfo->xmlpost ?
675
676
xmlpost_append_form_opts(vpninfo, form, request_body) :
append_form_opts(vpninfo, form, request_body);
677
678
679
680
if (!ret) {
*method = "POST";
*request_body_type = "application/x-www-form-urlencoded";
}
681
682
683
return ret;
}
684
685
686
687
688
689
690
691
692
/*
* Old submission format is just an HTTP query string:
*
* password=12345678&username=joe
*
* New XML format is more complicated:
*
* <config-auth client="vpn" type="<!-- init or auth-reply -->">
* <version who="vpn"><!-- currently just the OpenConnect version --></version>
693
* <device-id><!-- linux, linux-64, win, ... --></device-id>
694
695
696
697
698
699
700
701
702
703
704
705
* <opaque is-for="<!-- some name -->">
* <!-- just copy this verbatim from whatever the gateway sent us -->
* </opaque>
*
* For init only, add:
* <group-access>https://<!-- insert hostname here --></group-access>
*
* For auth-reply only, add:
* <auth>
* <username><!-- same treatment as the old form options --></username>
* <password><!-- ditto -->
* </auth>
706
* <group-select><!-- name of selected authgroup --></group-select>
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
* <host-scan-token><!-- vpninfo->csd_ticket --></host-scan-token>
*/
#define XCAST(x) ((const xmlChar *)(x))
static xmlDocPtr xmlpost_new_query(struct openconnect_info *vpninfo, const char *type,
xmlNodePtr *rootp)
{
xmlDocPtr doc;
xmlNodePtr root, node;
doc = xmlNewDoc(XCAST("1.0"));
if (!doc)
return NULL;
*rootp = root = xmlNewNode(NULL, XCAST("config-auth"));
if (!root)
goto bad;
if (!xmlNewProp(root, XCAST("client"), XCAST("vpn")))
goto bad;
if (!xmlNewProp(root, XCAST("type"), XCAST(type)))
goto bad;
xmlDocSetRootElement(doc, root);
731
732
node = xmlNewTextChild(root, NULL, XCAST("version"),
XCAST(vpninfo->version_string ? : openconnect_version_str));
733
734
735
736
737
if (!node)
goto bad;
if (!xmlNewProp(node, XCAST("who"), XCAST("vpn")))
goto bad;
738
739
node = xmlNewTextChild(root, NULL, XCAST("device-id"), XCAST(vpninfo->platname));
if (!node)
740
goto bad;
741
742
743
744
745
746
if (vpninfo->mobile_platform_version) {
if (!xmlNewProp(node, XCAST("platform-version"), XCAST(vpninfo->mobile_platform_version)) ||
!xmlNewProp(node, XCAST("device-type"), XCAST(vpninfo->mobile_device_type)) ||
!xmlNewProp(node, XCAST("unique-id"), XCAST(vpninfo->mobile_device_uniqueid)))
goto bad;
}
747
748
749
750
751
752
753
754
return doc;
bad:
xmlFreeDoc(doc);
return NULL;
}
755
static int xmlpost_complete(xmlDocPtr doc, struct oc_text_buf *body)
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
{
xmlChar *mem = NULL;
int len, ret = 0;
if (!body) {
xmlFree(doc);
return 0;
}
xmlDocDumpMemoryEnc(doc, &mem, &len, "UTF-8");
if (!mem) {
xmlFreeDoc(doc);
return -ENOMEM;
}
771
buf_append_bytes(body, mem, len);
772
773
774
775
776
777
778
xmlFreeDoc(doc);
xmlFree(mem);
return ret;
}
779
780
static int xmlpost_initial_req(struct openconnect_info *vpninfo,
struct oc_text_buf *request_body, int cert_fail)
781
782
783
{
xmlNodePtr root, node;
xmlDocPtr doc = xmlpost_new_query(vpninfo, "init", &root);
784
struct oc_text_buf *url_buf;
785
786
787
788
if (!doc)
return -ENOMEM;
789
790
791
792
793
794
795
url_buf = buf_alloc();
buf_append(url_buf, "https://%s", vpninfo->hostname);
if (vpninfo->port != 443)
buf_append(url_buf, ":%d", vpninfo->port);
/* Do we *need* to omit the trailing / here when no path? */
if (vpninfo->urlpath)
buf_append(url_buf, "/%s", vpninfo->urlpath);
796
797
798
if (buf_error(url_buf)) {
buf_free(url_buf);
799
goto bad;
800
801
802
}
node = xmlNewTextChild(root, NULL, XCAST("group-access"), XCAST(url_buf->data));
buf_free(url_buf);
803
804
if (!node)
goto bad;
805
806
807
808
809
if (cert_fail) {
node = xmlNewTextChild(root, NULL, XCAST("client-cert-fail"), NULL);
if (!node)
goto bad;
}
810
811
812
813
814
if (vpninfo->authgroup) {
node = xmlNewTextChild(root, NULL, XCAST("group-select"), XCAST(vpninfo->authgroup));
if (!node)
goto bad;
}
815
return xmlpost_complete(doc, request_body);
816
817
bad:
818
buf_free(url_buf);
819
xmlpost_complete(doc, NULL);
820
821
822
823
return -ENOMEM;
}
static int xmlpost_append_form_opts(struct openconnect_info *vpninfo,
824
struct oc_auth_form *form, struct oc_text_buf *body)
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
{
xmlNodePtr root, node;
xmlDocPtr doc = xmlpost_new_query(vpninfo, "auth-reply", &root);
struct oc_form_opt *opt;
if (!doc)
return -ENOMEM;
if (vpninfo->opaque_srvdata) {
node = xmlCopyNode(vpninfo->opaque_srvdata, 1);
if (!node)
goto bad;
if (!xmlAddChild(root, node))
goto bad;
}
node = xmlNewChild(root, NULL, XCAST("auth"), NULL);
if (!node)
goto bad;
for (opt = form->opts; opt; opt = opt->next) {
846
847
/* group_list: create a new <group-select> node under <config-auth> */
if (!strcmp(opt->name, "group_list")) {
848
if (!xmlNewTextChild(root, NULL, XCAST("group-select"), XCAST(opt->_value)))
849
850
851
852
goto bad;
continue;
}
853
854
855
856
/* answer,whichpin,new_password: rename to "password" */
if (!strcmp(opt->name, "answer") ||
!strcmp(opt->name, "whichpin") ||
!strcmp(opt->name, "new_password")) {
857
if (!xmlNewTextChild(node, NULL, XCAST("password"), XCAST(opt->_value)))
858
859
860
861
862
863
864
865
866
867
goto bad;
continue;
}
/* verify_pin,verify_password: ignore */
if (!strcmp(opt->name, "verify_pin") ||
!strcmp(opt->name, "verify_password")) {
continue;
}
868
/* everything else: create <foo>user_input</foo> under <auth> */
869
if (!xmlNewTextChild(node, NULL, XCAST(opt->name), XCAST(opt->_value)))
870
871
872
873
874
875
876
goto bad;
}
if (vpninfo->csd_token &&
!xmlNewTextChild(root, NULL, XCAST("host-scan-token"), XCAST(vpninfo->csd_token)))
goto bad;
877
return xmlpost_complete(doc, body);
878
879
bad:
880
xmlpost_complete(doc, NULL);
881
882
883
return -ENOMEM;
}
884
885
886
887
/* Return value:
* < 0, if unable to generate a tokencode
* = 0, on success
*/
888
889
890
static int cstp_can_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form,
struct oc_form_opt *opt)
891
{
892
893
894
895
if (vpninfo->token_mode == OC_TOKEN_MODE_NONE ||
vpninfo->token_bypassed)
return -EINVAL;
896
#ifdef HAVE_LIBSTOKEN
897
898
899
900
if (vpninfo->token_mode == OC_TOKEN_MODE_STOKEN) {
if (strcmp(opt->name, "password") &&
strcmp(opt->name, "answer"))
return -EINVAL;
901
return can_gen_stoken_code(vpninfo, form, opt);
902
}
903
#endif
904
/* Otherwise it's an OATH token of some kind. */
905
906
if (strcmp(opt->name, "secondary_password") &&
(!form->auth_id || strcmp(form->auth_id, "challenge")))
907
return -EINVAL;
908
909
return can_gen_tokencode(vpninfo, form, opt);
910
}
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
static int fetch_config(struct openconnect_info *vpninfo)
{
struct oc_text_buf *buf;
int result;
unsigned char local_sha1_bin[SHA1_SIZE];
char local_sha1_ascii[(SHA1_SIZE * 2)+1];
int i;
if (!vpninfo->profile_url || !vpninfo->profile_sha1 || !vpninfo->write_new_config)
return -ENOENT;
if (!strncasecmp(vpninfo->xmlsha1, vpninfo->profile_sha1, SHA1_SIZE * 2)) {
vpn_progress(vpninfo, PRG_TRACE,
_("Not downloading XML profile because SHA1 already matches\n"));
return 0;
}
if ((result = openconnect_open_https(vpninfo))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to open HTTPS connection to %s\n"),
vpninfo->hostname);
return result;
}
buf = buf_alloc();
937
938
939
940
941
if (vpninfo->port != 443)
buf_append(buf, "GET %s:%d HTTP/1.1\r\n", vpninfo->profile_url, vpninfo->port);
else
buf_append(buf, "GET %s HTTP/1.1\r\n", vpninfo->profile_url);
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
cstp_common_headers(vpninfo, buf);
if (vpninfo->xmlpost)
buf_append(buf, "Cookie: webvpn=%s\r\n", vpninfo->cookie);
buf_append(buf, "\r\n");
if (buf_error(buf))
return buf_free(buf);
if (vpninfo->ssl_write(vpninfo, buf->data, buf->pos) != buf->pos) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to send GET request for new config\n"));
buf_free(buf);
return -EIO;
}
result = process_http_response(vpninfo, 0, NULL, buf);
if (result < 0) {
/* We'll already have complained about whatever offended us */
buf_free(buf);
return -EINVAL;
}
if (result != 200) {
buf_free(buf);
return -EINVAL;
}
openconnect_sha1(local_sha1_bin, buf->data, buf->pos);
for (i = 0; i < SHA1_SIZE; i++)
sprintf(&local_sha1_ascii[i*2], "%02x", local_sha1_bin[i]);
if (strcasecmp(vpninfo->profile_sha1, local_sha1_ascii)) {
vpn_progress(vpninfo, PRG_ERR,
_("Downloaded config file did not match intended SHA1\n"));
buf_free(buf);
return -EINVAL;
}
vpn_progress(vpninfo, PRG_DEBUG, _("Downloaded new XML profile\n"));
result = vpninfo->write_new_config(vpninfo->cbdata, buf->data, buf->pos);
buf_free(buf);
return result;
}
988
989
990
991
992
993
994
995
996
997
998
999
1000
int set_csd_user(struct openconnect_info *vpninfo)
{
#if defined(_WIN32) || defined(__native_client__)
vpn_progress(vpninfo, PRG_ERR,
_("Error: Running the 'Cisco Secure Desktop' trojan on this platform is not yet implemented.\n"));
return -EPERM;
#else
setsid();
if (vpninfo->uid_csd_given && vpninfo->uid_csd != getuid()) {
struct passwd *pw;
int e;