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/* $NetBSD: tilde-luzah-bozo.c,v 1.11 2015/07/16 12:19:23 shm Exp $ */
/* $eterna: tilde-luzah-bozo.c,v 1.16 2011/11/18 09:21:15 mrg Exp $ */
/*
* Copyright (c) 1997-2014 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer and
* dedication in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/* this code implements ~user support for bozohttpd */
#ifndef NO_USER_SUPPORT
#include <sys/param.h>
#include <assert.h>
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bozohttpd.h"
/*
* bozo_user_transform does this:
* - chdir's /~user/public_html
* - returns the rest of the file, index.html appended if required
* - returned malloced file to serve in request->hr_file,
* ala transform_request().
*
* transform_request() is supposed to check that we have user support
* enabled.
*/
int
bozo_user_transform(bozo_httpreq_t *request, int *isindex)
{
bozohttpd_t *httpd = request->hr_httpd;
char c, *s, *file = NULL, *user;
struct passwd *pw;
*isindex = 0;
/* find username */
user = strchr(request->hr_file + 2, '~');
/* this shouldn't happen, but "better paranoid than sorry" */
assert(user != NULL);
user++;
if ((s = strchr(user, '/')) != NULL) {
*s++ = '\0';
c = s[strlen(s)-1];
*isindex = (c == '/' || c == '\0');
}
debug((httpd, DEBUG_OBESE, "looking for user %s",
user));
pw = getpwnam(user);
/* fix this up immediately */
if (s)
s[-1] = '/';
if (pw == NULL) {
(void)bozo_http_error(httpd, 404, request, "no such user");
return 0;
}
debug((httpd, DEBUG_OBESE, "user %s dir %s/%s uid %d gid %d",
pw->pw_name, pw->pw_dir, httpd->public_html,
pw->pw_uid, pw->pw_gid));
if (chdir(pw->pw_dir) < 0) {
bozo_warn(httpd, "chdir1 error: %s: %s", pw->pw_dir,
strerror(errno));
(void)bozo_http_error(httpd, 404, request,
"can't chdir to homedir");
return 0;
}
if (chdir(httpd->public_html) < 0) {
bozo_warn(httpd, "chdir2 error: %s: %s", httpd->public_html,
strerror(errno));
(void)bozo_http_error(httpd, 404, request,
"can't chdir to public_html");
return 0;
}
if (s == NULL || *s == '\0') {
file = bozostrdup(httpd, httpd->index_html);
} else {
file = bozomalloc(httpd, strlen(s) +
(*isindex ? strlen(httpd->index_html) + 1 : 1));
strcpy(file, s);
if (*isindex)
strcat(file, httpd->index_html);
}
/* see transform_request() */
if (*file == '/' || strcmp(file, "..") == 0 ||
strstr(file, "/..") || strstr(file, "../")) {
(void)bozo_http_error(httpd, 403, request, "illegal request");
free(file);
return 0;
}
if (bozo_auth_check(request, file)) {
free(file);
return 0;
}
free(request->hr_file);
request->hr_file = file;
debug((httpd, DEBUG_FAT, "transform_user returning %s under %s", file,
pw->pw_dir));
return 1;
}
#endif /* NO_USER_SUPPORT */
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