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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Monkey HTTP Server
* ==================
* Copyright 2001-2017 Eduardo Silva <eduardo@monkey.io>
*
* 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.
*/
#include <monkey/monkey.h>
#include <monkey/mk_user.h>
#include <monkey/mk_http.h>
#include <monkey/mk_http_status.h>
#include <monkey/mk_core.h>
#include <monkey/mk_utils.h>
#include <monkey/mk_config.h>
#ifndef _WIN32
#include <pwd.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <grp.h>
int mk_user_init(struct mk_http_session *cs, struct mk_http_request *sr,
struct mk_server *server)
{
int limit;
const int offset = 2; /* The user is defined after the '/~' string, so offset = 2 */
const int user_len = 255;
char user[/*user_len*/ 255]; /* VC++ Doesn't allow for this to be a const int*/
char *user_uri;
struct passwd *s_user;
if (sr->uri_processed.len <= 2) {
return -1;
}
limit = mk_string_char_search(sr->uri_processed.data + offset, '/',
sr->uri_processed.len);
if (limit == -1) {
limit = (sr->uri_processed.len) - offset;
}
if (limit + offset >= (user_len)) {
return -1;
}
memcpy(user, sr->uri_processed.data + offset, limit);
user[limit] = '\0';
MK_TRACE("user: '%s'", user);
/* Check system user */
if ((s_user = getpwnam(user)) == NULL) {
mk_http_error(MK_CLIENT_NOT_FOUND, cs, sr, server);
return -1;
}
if (sr->uri_processed.len > (unsigned int) (offset+limit)) {
user_uri = mk_mem_alloc(sr->uri_processed.len);
if (!user_uri) {
return -1;
}
memcpy(user_uri,
sr->uri_processed.data + (offset + limit),
sr->uri_processed.len - offset - limit);
user_uri[sr->uri_processed.len - offset - limit] = '\0';
mk_string_build(&sr->real_path.data, &sr->real_path.len,
"%s/%s%s",
s_user->pw_dir, server->conf_user_pub, user_uri);
mk_mem_free(user_uri);
}
else {
mk_string_build(&sr->real_path.data, &sr->real_path.len,
"%s/%s", s_user->pw_dir, server->conf_user_pub);
}
sr->user_home = MK_TRUE;
return 0;
}
/* Change process user */
int mk_user_set_uidgid(struct mk_server *server)
{
struct passwd *usr;
/* Launched by root ? */
if (geteuid() == 0 && server->user) {
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl)) {
mk_warn("cannot get resource limits");
}
/* Check if user exists */
if ((usr = getpwnam(server->user)) == NULL) {
mk_err("Invalid user '%s'", server->user);
goto out;
}
if (initgroups(server->user, usr->pw_gid) != 0) {
mk_err("Initgroups() failed");
}
/* Change process UID and GID */
if (setegid(usr->pw_gid) == -1) {
mk_err("I cannot change the GID to %u", usr->pw_gid);
}
if (seteuid(usr->pw_uid) == -1) {
mk_err("I cannot change the UID to %u", usr->pw_uid);
}
server->is_seteuid = MK_TRUE;
}
out:
/* Variables set for run checks on file permission */
//FIXME
//EUID = geteuid();
//EGID = getegid();
return 0;
}
/* Return process to the original user */
int mk_user_undo_uidgid(struct mk_server *server)
{
if (server->is_seteuid == MK_TRUE) {
if (setegid(0) < 0) {
mk_err("Can't restore effective GID");
}
if (seteuid(0) < 0) {
mk_err("Can't restore effective UID");
}
}
return 0;
}
#else
/*
None of these functionalities are going to be available in windows at the moment
*/
int mk_user_init(struct mk_http_session* cs, struct mk_http_request* sr,
struct mk_server* server)
{
return -1;
}
int mk_user_set_uidgid(struct mk_server* server)
{
mk_err("Cannot impersonate users in windows");
return 0;
}
int mk_user_undo_uidgid(struct mk_server* server)
{
return 0;
}
#endif
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