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/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#define _XOPEN_SOURCE 700
#include <strings.h>
#ifdef HAVE_SHADOW
#include <shadow.h>
#endif
#include "uhttpd.h"
static LIST_HEAD(auth_realms);
void uh_auth_add(const char *path, const char *user, const char *pass)
{
struct auth_realm *new = NULL;
struct passwd *pwd;
const char *new_pass = NULL;
char *dest_path, *dest_user, *dest_pass;
#ifdef HAVE_SHADOW
struct spwd *spwd;
#endif
/* given password refers to a passwd entry */
if ((strlen(pass) > 3) && !strncmp(pass, "$p$", 3)) {
#ifdef HAVE_SHADOW
/* try to resolve shadow entry */
spwd = getspnam(&pass[3]);
if (spwd)
new_pass = spwd->sp_pwdp;
#endif
if (!new_pass) {
pwd = getpwnam(&pass[3]);
if (pwd && pwd->pw_passwd && pwd->pw_passwd[0] &&
pwd->pw_passwd[0] != '!')
new_pass = pwd->pw_passwd;
}
} else {
new_pass = pass;
}
if (!new_pass || !new_pass[0])
return;
new = calloc_a(sizeof(*new),
&dest_path, strlen(path) + 1,
&dest_user, strlen(user) + 1,
&dest_pass, strlen(new_pass) + 1);
if (!new)
return;
new->path = strcpy(dest_path, path);
new->user = strcpy(dest_user, user);
new->pass = strcpy(dest_pass, new_pass);
list_add(&new->list, &auth_realms);
}
bool uh_auth_check(struct client *cl, struct path_info *pi)
{
struct http_request *req = &cl->request;
struct auth_realm *realm;
bool user_match = false;
char *user = NULL;
char *pass = NULL;
int plen;
if (pi->auth && !strncasecmp(pi->auth, "Basic ", 6)) {
const char *auth = pi->auth + 6;
uh_b64decode(uh_buf, sizeof(uh_buf), auth, strlen(auth));
pass = strchr(uh_buf, ':');
if (pass) {
user = uh_buf;
*pass++ = 0;
}
}
req->realm = NULL;
plen = strlen(pi->name);
list_for_each_entry(realm, &auth_realms, list) {
int rlen = strlen(realm->path);
if (plen < rlen)
continue;
if (strncasecmp(pi->name, realm->path, rlen) != 0)
continue;
req->realm = realm;
if (!user)
break;
if (strcmp(user, realm->user) != 0)
continue;
user_match = true;
break;
}
if (!req->realm)
return true;
if (user_match && !strcmp(crypt(pass, realm->pass), realm->pass))
return true;
uh_http_header(cl, 401, "Authorization Required");
ustream_printf(cl->us,
"WWW-Authenticate: Basic realm=\"%s\"\r\n"
"Content-Type: text/plain\r\n\r\n",
conf.realm);
uh_chunk_printf(cl, "Authorization Required\n");
uh_request_done(cl);
return false;
}
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