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auth.c
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auth.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
* Copyright © 2013 John Morrissey <[email protected]>
*
* 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 "openconnect-internal.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/wait.h>
#include <pwd.h>
#include <grp.h>
#endif
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
enum {
CERT1_REQUESTED = (1<<0),
CERT1_AUTHENTICATED = (1<<1),
CERT2_REQUESTED = (1<<2),
};
struct cert_request {
unsigned int state:16;
unsigned int hashes:16;
};
static int xmlpost_append_form_opts(struct openconnect_info *vpninfo,
struct oc_auth_form *form, struct oc_text_buf *body);
static int cstp_can_gen_tokencode(struct openconnect_info *vpninfo,
struct oc_auth_form *form,
struct oc_form_opt *opt);
/* multiple certificate-based authentication */
static void parse_multicert_request(struct openconnect_info *vpninfo,
xmlNodePtr node, struct cert_request *cert_rq);
static int prepare_multicert_response(struct openconnect_info *vpninfo,
struct cert_request cert_rq, const char *challenge,
struct oc_text_buf *body);
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++) {
if (!strcmp(value, sopt->choices[i]->name)) {
opt->_value = sopt->choices[i]->name;
return 0;
}
}
return -EINVAL;
}
opt->_value = strdup(value);
if (!opt->_value)
return -ENOMEM;
return 0;
}
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;
}
static int parse_auth_choice(struct openconnect_info *vpninfo, struct oc_auth_form *form,
xmlNode *xml_node)
{
struct oc_form_opt_select *opt;
xmlNode *opt_node;
int max_choices = 0, selection = 0;
for (opt_node = xml_node->children; opt_node; opt_node = opt_node->next)
max_choices++;
/* Return early when there is a <select/> tag with no children */
if (max_choices == 0) {
return 0;
}
opt = calloc(1, sizeof(*opt));
if (!opt)
return -ENOMEM;
opt->form.type = OC_FORM_OPT_SELECT;
opt->form.name = (char *)xmlGetProp(xml_node, (unsigned char *)"name");
opt->form.label = (char *)xmlGetProp(xml_node, (unsigned char *)"label");
if (!opt->form.name) {
vpn_progress(vpninfo, PRG_ERR, _("Form choice has no name\n"));
free_opt((struct oc_form_opt *)opt);
return -EINVAL;
}
opt->choices = calloc(1, max_choices * sizeof(struct oc_choice *));
if (!opt->choices) {
free_opt((struct oc_form_opt *)opt);
return -ENOMEM;
}
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
char *form_id;
struct oc_choice *choice;
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");
if (!form_id)
form_id = (char *)xmlNodeGetContent(xml_node);
if (!form_id)
continue;
choice = calloc(1, sizeof(*choice));
if (!choice) {
free_opt((struct oc_form_opt *)opt);
return -ENOMEM;
}
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");
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");
if (prop_equals(xml_node, "selected", "true"))
selection = opt->nr_choices;
opt->choices[opt->nr_choices++] = choice;
}
if (!strcmp(opt->form.name, "group_list")) {
form->authgroup_opt = opt;
form->authgroup_selection = selection;
}
/* 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;
return 0;
}
static int parse_form(struct openconnect_info *vpninfo, struct oc_auth_form *form,
xmlNode *xml_node)
{
char *input_type, *input_name, *input_label;
for (xml_node = xml_node->children; xml_node; xml_node = xml_node->next) {
struct oc_form_opt *opt, **p;
if (xml_node->type != XML_ELEMENT_NODE)
continue;
if (!strcmp((char *)xml_node->name, "select")) {
if (parse_auth_choice(vpninfo, form, xml_node))
return -EINVAL;
continue;
}
if (strcmp((char *)xml_node->name, "input")) {
vpn_progress(vpninfo, PRG_DEBUG,
_("name %s not input\n"), xml_node->name);
continue;
}
input_type = (char *)xmlGetProp(xml_node, (unsigned char *)"type");
if (!input_type) {
vpn_progress(vpninfo, PRG_INFO,
_("No input type in form\n"));
continue;
}
if (!strcmp(input_type, "submit") || !strcmp(input_type, "reset")) {
free(input_type);
continue;
}
input_name = (char *)xmlGetProp(xml_node, (unsigned char *)"name");
if (!input_name) {
vpn_progress(vpninfo, PRG_INFO,
_("No input name in form\n"));
free(input_type);
continue;
}
input_label = (char *)xmlGetProp(xml_node, (unsigned char *)"label");
if (!input_label && asprintf(&input_label, "%s:", input_name) == -1)
goto nomem;
opt = calloc(1, sizeof(*opt));
if (!opt) {
nomem:
free(input_type);
free(input_name);
free(input_label);
return -ENOMEM;
}
opt->name = input_name;
opt->label = input_label;
opt->flags = prop_equals(xml_node, "second-auth", "1") ? OC_FORM_OPT_SECOND_AUTH : 0;
if (!strcmp(input_type, "hidden")) {
opt->type = OC_FORM_OPT_HIDDEN;
opt->_value = (char *)xmlGetProp(xml_node, (unsigned char *)"value");
} else if (!strcmp(input_type, "text")) {
opt->type = OC_FORM_OPT_TEXT;
} else if (!strcmp(input_type, "sso")) {
opt->type = OC_FORM_OPT_SSO_TOKEN;
} else if (!strcmp(input_type, "password")) {
if (!cstp_can_gen_tokencode(vpninfo, form, opt))
opt->type = OC_FORM_OPT_TOKEN;
else
opt->type = OC_FORM_OPT_PASSWORD;
} else {
vpn_progress(vpninfo, PRG_INFO,
_("Unknown input type %s in form\n"),
input_type);
free(input_type);
free(input_name);
free(input_label);
free(opt);
continue;
}
free(input_type);
p = &form->opts;
while (*p)
p = &(*p)->next;
*p = opt;
}
return 0;
}
static char *xmlnode_msg(xmlNode *xml_node)
{
char *fmt = (char *)xmlNodeGetContent(xml_node);
char *result, *params[2], *pct;
int len;
int nr_params = 0;
if (!fmt || !fmt[0]) {
free(fmt);
return NULL;
}
len = strlen(fmt) + 1;
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;
}
strcpy(result, fmt);
free(fmt);
for (pct = strchr(result, '%'); pct;
(pct = strchr(pct, '%'))) {
int paramlen;
/* 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... */
memmove(pct + paramlen, pct + 2, strlen(pct + 2) + 1);
/* ... 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]);
return result;
}
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;
}
/*
* Legacy server response looks like:
*
* <auth id="<!-- "main" for initial attempt, "success" means we have a cookie -->">
* <title><!-- title to display to user --></title>
* <csd
* token="<!-- save to vpninfo->csd_token -->"
* ticket="<!-- save to vpninfo->csd_ticket -->" />
* <csd
* stuburl="<!-- save to vpninfo->csd_stuburl if --os=win -->"
* starturl="<!-- save to vpninfo->csd_starturl if --os=win -->"
* waiturl="<!-- save to vpninfo->csd_waiturl if --os=win -->"
* <csdMac
* 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 -->" />
* <csdLinux
* stuburl="<!-- same as above, for Linux -->"
* starturl="<!-- same as above, for Linux -->"
* waiturl="<!-- same as above, for Linux -->" />
* <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.
*/
/* Translate platform names (derived from AnyConnect) into the relevant
* CSD tag names
*/
static inline const char *csd_tag_name(struct openconnect_info *vpninfo)
{
if (!strcmp(vpninfo->platname, "mac-intel"))
return "csdMac";
else if (!strcmp(vpninfo->platname, "win"))
return "csd";
else
/* linux, linux-64, android, apple-ios */
return "csdLinux";
}
/* Ignore stubs on mobile platforms */
static inline int csd_use_stub(struct openconnect_info *vpninfo)
{
if (!strcmp(vpninfo->platname, "android") || !strcmp(vpninfo->platname, "apple-ios"))
return 0;
else
return 1;
}
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;
xmlnode_get_text(xml_node, "banner", &form->banner);
xmlnode_get_text(xml_node, "message", &form->message);
xmlnode_get_text(xml_node, "error", &form->error);
xmlnode_get_text(xml_node, "sso-v2-login", &vpninfo->sso_login);
xmlnode_get_text(xml_node, "sso-v2-login-final", &vpninfo->sso_login_final);
xmlnode_get_text(xml_node, "sso-v2-token-cookie-name", &vpninfo->sso_token_cookie);
xmlnode_get_text(xml_node, "sso-v2-error-cookie-name", &vpninfo->sso_error_cookie);
xmlnode_get_text(xml_node, "sso-v2-browser-mode", &vpninfo->sso_browser_mode);
if (xmlnode_is_named(xml_node, "form")) {
/* defaults for new XML POST */
form->method = strdup("POST");
xmlnode_get_prop(xml_node, "method", &form->method);
xmlnode_get_prop(xml_node, "action", &form->action);
/* - expect unset action (reuse current URL) or non-empty action="..."
* - expect unset method (defaults to "POST") or explicit method="POST"
*/
if ((form->action && !form->action[0]) ||
!form->method || strcasecmp(form->method, "POST")) {
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;
} 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);
} 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");
}
/* 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, csd_tag_name(vpninfo))) {
/* ignore the CSD trojan binary on mobile platforms */
if (csd_use_stub(vpninfo))
xmlnode_get_prop(xml_node, "stuburl", &vpninfo->csd_stuburl);
xmlnode_get_prop(xml_node, "starturl", &vpninfo->csd_starturl);
xmlnode_get_prop(xml_node, "waiturl", &vpninfo->csd_waiturl);
vpninfo->csd_preurl = strdup(vpninfo->urlpath);
}
}
out:
return ret;
}
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;
}
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);
}
}
/* Return value:
* < 0, on error
* = 0, on success; *form is populated
*/
static int parse_xml_response(struct openconnect_info *vpninfo,
char *response,struct oc_auth_form **formp,
struct cert_request *cert_rq)
{
struct oc_auth_form *form;
xmlDocPtr xml_doc;
xmlNode *xml_node;
int old_cert_rq_state = 0;
int ret;
if (*formp) {
free_auth_form(*formp);
*formp = NULL;
}
if (cert_rq) {
old_cert_rq_state = cert_rq->state;
*cert_rq = (struct cert_request) { 0 };
}
if (!response) {
vpn_progress(vpninfo, PRG_DEBUG,
_("Empty response from server\n"));
return -EINVAL;
}
form = calloc(1, sizeof(*form));
if (!form)
return -ENOMEM;
xml_doc = xmlReadMemory(response, strlen(response), NULL, NULL,
XML_PARSE_NOERROR|XML_PARSE_RECOVER);
if (!xml_doc) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse server response\n"));
vpn_progress(vpninfo, PRG_DEBUG,
_("Response was:%s\n"), response);
free(form);
return -EINVAL;
}
xml_node = xmlDocGetRootElement(xml_doc);
while (xml_node) {
ret = 0;
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;
} else if (xmlnode_is_named(xml_node, "client-cert-request")) {
if (cert_rq)
cert_rq->state |= CERT1_REQUESTED;
else {
vpn_progress(vpninfo, PRG_ERR,
_("Received <client-cert-request> when not expected.\n"));
ret = -EINVAL;
}
} else if (xmlnode_is_named(xml_node, "multiple-client-cert-request")) {
if (cert_rq) {
cert_rq->state |= CERT1_REQUESTED|CERT2_REQUESTED;
parse_multicert_request(vpninfo, xml_node, cert_rq);
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Received <multiple-client-cert-request> when not expected.\n"));
ret = -EINVAL;
}
} else if (xmlnode_is_named(xml_node, "cert-authenticated")) {
/**
* cert-authenticated indicates that the certificate for the
* TLS session is valid.
*/
if (cert_rq)
cert_rq->state |= CERT1_AUTHENTICATED;
} 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);
} else if (xmlnode_is_named(xml_node, "config")) {
parse_config_node(vpninfo, xml_node);
} else if (xmlnode_is_named(xml_node, "session-token")) {
http_add_cookie(vpninfo, "webvpn",
(const char *)xmlNodeGetContent(xml_node), 1);
} else {
xmlnode_get_text(xml_node, "error", &form->error);
}
if (ret)
goto out;
xml_node = xml_node->next;
}
if ((old_cert_rq_state & CERT2_REQUESTED) && form->error) {
vpn_progress(vpninfo, PRG_ERR,
_("Server reported certificate error: %s.\n"), form->error);
ret = -EINVAL;
goto out;
}
if (!form->auth_id && (!cert_rq || !cert_rq->state)) {
vpn_progress(vpninfo, PRG_ERR,
_("XML response has no \"auth\" node\n"));
ret = -EINVAL;
goto out;
}
*formp = form;
xmlFreeDoc(xml_doc);
return 0;
out:
xmlFreeDoc(xml_doc);
free_auth_form(form);
return ret;
}
/* Return value:
* < 0, on error
* = 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
*/
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)
{
int ret;
struct oc_vpn_option *opt, *next;
if (!strcmp(form->auth_id, "success"))
return OC_FORM_RESULT_LOGGEDIN;
if (vpninfo->nopasswd) {
vpn_progress(vpninfo, PRG_ERR,
_("Asked for password but '--no-passwd' set\n"));
return -EPERM;
}
if (vpninfo->csd_token && vpninfo->csd_ticket && vpninfo->csd_starturl && vpninfo->csd_waiturl) {
/* 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;
return OC_FORM_RESULT_OK;
}
if (!form->opts) {
if (form->message)
vpn_progress(vpninfo, PRG_INFO, "%s\n", form->message);
if (form->error) {
if (!strcmp(form->error, "Certificate Validation Failure")) {
/* XX: Cisco servers send this ambiguous error string when the CLIENT certificate
* is absent or incorrect. We rewrite it to make this clearer, while preserving
* the original error as a substring.
*/
free(form->error);
if (!(form->error = strdup(_("Client certificate missing or incorrect (Certificate Validation Failure)"))))
return -ENOMEM;
} else
vpn_progress(vpninfo, PRG_ERR, "%s\n", form->error);
}
if (!strcmp(form->auth_id, "openconnect_authentication_complete"))
goto justpost;
return -EPERM;
}
ret = process_auth_form(vpninfo, form);
if (ret)
return ret;
/* tokencode generation is deferred until after username prompts and CSD */
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;
return ret;
}
justpost:
ret = vpninfo->xmlpost ?
xmlpost_append_form_opts(vpninfo, form, request_body) :
append_form_opts(vpninfo, form, request_body);
if (!ret) {
*method = "POST";
*request_body_type = vpninfo->xmlpost ? "application/xml; charset=utf-8" : "application/x-www-form-urlencoded";
}
return ret;
}
/*
* 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>
* <device-id><!-- linux, linux-64, win, ... --></device-id>
* <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>
* <group-select><!-- name of selected authgroup --></group-select>
* <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, capabilities;
doc = xmlNewDoc(XCAST("1.0"));
if (!doc)
return NULL;
root = xmlNewNode(NULL, XCAST("config-auth"));
if (!root)
goto bad;
xmlDocSetRootElement(doc, root);
if (!xmlNewProp(root, XCAST("client"), XCAST("vpn")))
goto bad;
if (!xmlNewProp(root, XCAST("type"), XCAST(type)))
goto bad;
if (!xmlNewProp(root, XCAST("aggregate-auth-version"), XCAST("2")))
goto bad;
node = xmlNewTextChild(root, NULL, XCAST("version"),
XCAST(vpninfo->version_string ? : openconnect_version_str));
if (!node)
goto bad;
if (!xmlNewProp(node, XCAST("who"), XCAST("vpn")))
goto bad;
node = xmlNewTextChild(root, NULL, XCAST("device-id"), XCAST(vpninfo->platname));
if (!node)
goto bad;
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;
}
capabilities = xmlNewNode(NULL, XCAST("capabilities"));
if (!capabilities)
goto bad;
capabilities = xmlAddChild(root, capabilities);
if (!capabilities)
goto bad;
if (!vpninfo->no_external_auth) {
node = xmlNewTextChild(capabilities, NULL, XCAST("auth-method"), XCAST("single-sign-on-v2"));
if (!node)
goto bad;
#ifdef HAVE_HPKE_SUPPORT
node = xmlNewTextChild(capabilities, NULL, XCAST("auth-method"), XCAST("single-sign-on-external-browser"));
if (!node)
goto bad;
#endif
}
if (vpninfo->certinfo[1].cert) {
node = xmlNewTextChild(capabilities, NULL, XCAST("auth-method"), XCAST("multiple-cert"));
if (!node)
goto bad;
}
*rootp = root;
return doc;
bad:
xmlFreeDoc(doc);
return NULL;
}
static int xmlpost_complete(xmlDocPtr doc, struct oc_text_buf *body)
{
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;
}
buf_append_bytes(body, mem, len);
xmlFreeDoc(doc);
xmlFree(mem);
return ret;
}
static int xmlpost_initial_req(struct openconnect_info *vpninfo,
struct oc_text_buf *request_body, int cert_fail)
{
xmlNodePtr root, node;
xmlDocPtr doc = xmlpost_new_query(vpninfo, "init", &root);
char *url;
if (!doc)
return -ENOMEM;
url = internal_get_url(vpninfo);
if (!url)
goto bad;
node = xmlNewTextChild(root, NULL, XCAST("group-access"), XCAST(url));
if (!node)
goto bad;
if (cert_fail) {
node = xmlNewTextChild(root, NULL, XCAST("client-cert-fail"), NULL);
if (!node)
goto bad;
}
if (vpninfo->authgroup) {
node = xmlNewTextChild(root, NULL, XCAST("group-select"), XCAST(vpninfo->authgroup));
if (!node)
goto bad;
}
free(url);
return xmlpost_complete(doc, request_body);
bad:
xmlpost_complete(doc, NULL);
return -ENOMEM;
}
static int xmlpost_append_form_opts(struct openconnect_info *vpninfo,
struct oc_auth_form *form, struct oc_text_buf *body)
{
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) {
/* group_list: create a new <group-select> node under <config-auth> */
if (!strcmp(opt->name, "group_list")) {
if (!xmlNewTextChild(root, NULL, XCAST("group-select"), XCAST(opt->_value)))
goto bad;
continue;
}
/* answer,whichpin,new_password: rename to "password" */
if (!strcmp(opt->name, "answer") ||
!strcmp(opt->name, "whichpin") ||
!strcmp(opt->name, "new_password")) {
if (!xmlNewTextChild(node, NULL, XCAST("password"), XCAST(opt->_value)))
goto bad;
continue;
}
/* verify_pin,verify_password: ignore */
if (!strcmp(opt->name, "verify_pin") ||
!strcmp(opt->name, "verify_password")) {
continue;
}
/* everything else: create <foo>user_input</foo> under <auth> */
if (!xmlNewTextChild(node, NULL, XCAST(opt->name), XCAST(opt->_value)))
goto bad;
}
if (vpninfo->csd_token &&
!xmlNewTextChild(root, NULL, XCAST("host-scan-token"), XCAST(vpninfo->csd_token)))
goto bad;
return xmlpost_complete(doc, body);
bad:
xmlpost_complete(doc, NULL);
return -ENOMEM;
}