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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cassert>
#include "auth.h"
#include "log.h"
#include "protocol.h"
#include "user.h"
#include "userintf.h"
#include "util.h"
extern string user_host;
t_cr_cache_entry:: t_cr_cache_entry(const t_url &_to, const t_credentials &_cr,
const string &_passwd, bool _proxy) :
to(_to)
{
credentials = _cr;
passwd = _passwd;
proxy = _proxy;
}
list<t_cr_cache_entry>::iterator t_auth::find_cache_entry(
const t_url &_to, const string &realm, bool proxy)
{
for (list<t_cr_cache_entry>::iterator i = cache.begin();
i != cache.end(); i++)
{
// RFC 3261 22.1
// Only the realm determines the protection space.
// So the to-uri must not need to be compared as for HTTP
// i.e. check i->to == _to must not be done.
// As realm strings are globally unique there is no need
// to check if the credentials are for a 407 or 401 response.
// i.e. check i->proxy == proxy is not needed.
if (i->credentials.digest_response.realm == realm)
{
return i;
}
}
return cache.end();
}
void t_auth::update_cache(const t_url &to, const t_credentials &cr,
const string &passwd, bool proxy)
{
list<t_cr_cache_entry>::iterator i, j;
i = find_cache_entry(to, cr.digest_response.realm, proxy);
if (i == cache.end()) {
if (cache.size() > AUTH_CACHE_SIZE) {
cache.erase(cache.begin());
}
cache.push_back(t_cr_cache_entry(to, cr, passwd, proxy));
} else {
i->credentials = cr;
i->passwd = passwd;
// Move cache entry to end of the cache.
// TODO: this can be more efficient by checking if the
// entry is already at the end.
t_cr_cache_entry e = *i;
cache.erase(i);
cache.push_back(e);
}
}
bool t_auth::auth_failed(t_request *r, const t_challenge &c,
bool proxy) const
{
if (c.digest_challenge.stale) {
log_file->write_report("Stale nonce value.", "t_auth::auth_failed");
return false;
}
if (proxy) {
return r->hdr_proxy_authorization.contains(
c.digest_challenge.realm, r->uri);
} else {
return r->hdr_authorization.contains(
c.digest_challenge.realm, r->uri);
}
}
void t_auth::remove_credentials(t_request *r, const t_challenge &c,
bool proxy) const
{
if (proxy) {
r->hdr_proxy_authorization.remove_credentials(
c.digest_challenge.realm, r->uri);
} else {
r->hdr_authorization.remove_credentials(
c.digest_challenge.realm, r->uri);
}
}
t_auth::t_auth() {
re_register = false;
}
bool t_auth::authorize(t_user *user_config, t_request *r, t_response *resp) {
string username;
string passwd;
list<t_cr_cache_entry>::iterator i;
t_challenge c;
bool proxy;
assert(resp->must_authenticate());
if (resp->code == R_401_UNAUTHORIZED) {
c = resp->hdr_www_authenticate.challenge;
proxy = false;
} else {
c = resp->hdr_proxy_authenticate.challenge;
proxy = true;
}
// Only DIGEST is supported
if (cmp_nocase(c.auth_scheme, AUTH_DIGEST) != 0) {
log_file->write_header("t_auth::authorize");
log_file->write_raw("Unsupported authentication scheme: ");
log_file->write_raw(c.auth_scheme);
log_file->write_endl();
log_file->write_footer();
return false;
}
const t_digest_challenge &dc = c.digest_challenge;
i = find_cache_entry(r->uri, dc.realm, proxy);
if (auth_failed(r, c, proxy)) {
// The current credentials are wrong. Remove them and
// ask the user for a username and password.
remove_credentials(r, c, proxy);
} else {
// Determine user name and password
if (i != cache.end()) {
username = i->credentials.digest_response.username;
passwd = i->passwd;
} else if (dc.realm == user_config->get_auth_realm() ||
user_config->get_auth_realm() == "") {
username = user_config->get_auth_name();
passwd = user_config->get_auth_pass();
}
if (dc.stale) {
// The current credentials are stale. Remove them.
remove_credentials(r, c, proxy);
}
}
// Ask user for username/password
if ((username == "" || passwd == "") && !re_register) {
if (!ui->cb_ask_credentials(user_config, dc.realm, username, passwd)) {
log_file->write_report("Asking user name and password failed.",
"t_auth::authorize");
return false;
}
}
// No valid username/passwd
if (username == "" && passwd == "") {
log_file->write_report("Incorrect user name and/or password.",
"t_auth::authorize");
return false;
}
bool auth_success;
string fail_reason;
if (!proxy) {
t_credentials cr;
auth_success = r->www_authorize(c, user_config,
username, passwd, 1, NEW_CNONCE, cr, fail_reason);
if (auth_success) {
update_cache(r->uri, cr, passwd, proxy);
}
} else {
t_credentials cr;
auth_success = r->proxy_authorize(c, user_config,
username, passwd, 1, NEW_CNONCE, cr, fail_reason);
if (auth_success) {
update_cache(r->uri, cr, passwd, proxy);
}
}
if (!auth_success) {
log_file->write_report(fail_reason, "t_auth::authorize");
return false;
}
return true;
}
void t_auth::remove_from_cache(const string &realm) {
if (realm.empty()) {
cache.clear();
} else {
list<t_cr_cache_entry>::iterator i = find_cache_entry(t_url(), realm);
if (i != cache.end()) {
cache.erase(i);
}
}
}
void t_auth::set_re_register(bool on) {
re_register = on;
}
bool t_auth::get_re_register(void) const {
return re_register;
}
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