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/* $NetBSD: auth-bozo.c,v 1.16 2014/12/26 19:52:00 mrg Exp $ */
/* $eterna: auth-bozo.c,v 1.17 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 "http basic authorisation" for bozohttpd */
#ifdef DO_HTPASSWD
#include <sys/param.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "bozohttpd.h"
#ifndef AUTH_FILE
#define AUTH_FILE ".htpasswd"
#endif
static ssize_t base64_decode(const unsigned char *, size_t,
unsigned char *, size_t);
/*
* Check if HTTP authentication is required
*/
int
bozo_auth_check(bozo_httpreq_t *request, const char *file)
{
bozohttpd_t *httpd = request->hr_httpd;
struct stat sb;
char dir[MAXPATHLEN], authfile[MAXPATHLEN], *basename;
char user[BUFSIZ], *pass;
FILE *fp;
int len;
/* get dir=dirname(file) */
snprintf(dir, sizeof(dir), "%s", file);
if ((basename = strrchr(dir, '/')) == NULL)
strcpy(dir, ".");
else {
*basename++ = '\0';
/* ensure basename(file) != AUTH_FILE */
if (bozo_check_special_files(request, basename))
return 1;
}
request->hr_authrealm = bozostrdup(httpd, dir);
if ((size_t)snprintf(authfile, sizeof(authfile), "%s/%s", dir, AUTH_FILE) >=
sizeof(authfile)) {
return bozo_http_error(httpd, 404, request,
"authfile path too long");
}
if (stat(authfile, &sb) < 0) {
debug((httpd, DEBUG_NORMAL,
"bozo_auth_check realm `%s' dir `%s' authfile `%s' missing",
dir, file, authfile));
return 0;
}
if ((fp = fopen(authfile, "r")) == NULL)
return bozo_http_error(httpd, 403, request,
"no permission to open authfile");
debug((httpd, DEBUG_NORMAL,
"bozo_auth_check realm `%s' dir `%s' authfile `%s' open",
dir, file, authfile));
if (request->hr_authuser && request->hr_authpass) {
while (fgets(user, sizeof(user), fp) != NULL) {
len = strlen(user);
if (len > 0 && user[len-1] == '\n')
user[--len] = '\0';
if ((pass = strchr(user, ':')) == NULL)
continue;
*pass++ = '\0';
debug((httpd, DEBUG_NORMAL,
"bozo_auth_check authfile `%s':`%s' "
"client `%s':`%s'",
user, pass, request->hr_authuser,
request->hr_authpass));
if (strcmp(request->hr_authuser, user) != 0)
continue;
if (strcmp(crypt(request->hr_authpass, pass),
pass) != 0)
break;
fclose(fp);
return 0;
}
}
fclose(fp);
return bozo_http_error(httpd, 401, request, "bad auth");
}
void
bozo_auth_init(bozo_httpreq_t *request)
{
request->hr_authuser = NULL;
request->hr_authpass = NULL;
}
void
bozo_auth_cleanup(bozo_httpreq_t *request)
{
if (request == NULL)
return;
free(request->hr_authuser);
free(request->hr_authpass);
free(request->hr_authrealm);
}
int
bozo_auth_check_headers(bozo_httpreq_t *request, char *val, char *str, ssize_t len)
{
bozohttpd_t *httpd = request->hr_httpd;
if (strcasecmp(val, "authorization") == 0 &&
strncasecmp(str, "Basic ", 6) == 0) {
char authbuf[BUFSIZ];
char *pass = NULL;
ssize_t alen;
alen = base64_decode((unsigned char *)str + 6,
(size_t)(len - 6),
(unsigned char *)authbuf,
sizeof(authbuf) - 1);
if (alen != -1)
authbuf[alen] = '\0';
if (alen == -1 ||
(pass = strchr(authbuf, ':')) == NULL)
return bozo_http_error(httpd, 400, request,
"bad authorization field");
*pass++ = '\0';
free(request->hr_authuser);
free(request->hr_authpass);
request->hr_authuser = bozostrdup(httpd, authbuf);
request->hr_authpass = bozostrdup(httpd, pass);
debug((httpd, DEBUG_FAT,
"decoded authorization `%s' as `%s':`%s'",
str, request->hr_authuser, request->hr_authpass));
/* don't store in request->headers */
return 1;
}
return 0;
}
int
bozo_auth_check_special_files(bozo_httpreq_t *request,
const char *name)
{
bozohttpd_t *httpd = request->hr_httpd;
if (strcmp(name, AUTH_FILE) == 0)
return bozo_http_error(httpd, 403, request,
"no permission to open authfile");
return 0;
}
void
bozo_auth_check_401(bozo_httpreq_t *request, int code)
{
bozohttpd_t *httpd = request->hr_httpd;
if (code == 401)
bozo_printf(httpd,
"WWW-Authenticate: Basic realm=\"%s\"\r\n",
(request && request->hr_authrealm) ?
request->hr_authrealm : "default realm");
}
#ifndef NO_CGIBIN_SUPPORT
void
bozo_auth_cgi_setenv(bozo_httpreq_t *request,
char ***curenvpp)
{
bozohttpd_t *httpd = request->hr_httpd;
if (request->hr_authuser && *request->hr_authuser) {
bozo_setenv(httpd, "AUTH_TYPE", "Basic", (*curenvpp)++);
bozo_setenv(httpd, "REMOTE_USER", request->hr_authuser,
(*curenvpp)++);
}
}
int
bozo_auth_cgi_count(bozo_httpreq_t *request)
{
return (request->hr_authuser && *request->hr_authuser) ? 2 : 0;
}
#endif /* NO_CGIBIN_SUPPORT */
/*
* Decode len bytes starting at in using base64 encoding into out.
* Result is *not* NUL terminated.
* Written by Luke Mewburn <lukem@NetBSD.org>
*/
const unsigned char decodetable[] = {
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 0, 255, 255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 255, 255, 255, 255, 255,
};
static ssize_t
base64_decode(const unsigned char *in, size_t ilen, unsigned char *out,
size_t olen)
{
unsigned char *cp;
size_t i;
if (ilen == 0) {
if (olen)
*out = '\0';
return 0;
}
cp = out;
for (i = 0; i < ilen; i += 4) {
if (cp + 3 > out + olen)
return (-1);
#define IN_CHECK(x) \
if ((x) > sizeof(decodetable) || decodetable[(x)] == 255) \
return(-1)
IN_CHECK(in[i + 0]);
/*LINTED*/
*(cp++) = decodetable[in[i + 0]] << 2
| decodetable[in[i + 1]] >> 4;
IN_CHECK(in[i + 1]);
/*LINTED*/
*(cp++) = decodetable[in[i + 1]] << 4
| decodetable[in[i + 2]] >> 2;
IN_CHECK(in[i + 2]);
*(cp++) = decodetable[in[i + 2]] << 6
| decodetable[in[i + 3]];
#undef IN_CHECK
}
while (i > 0 && in[i - 1] == '=')
cp--,i--;
return (cp - out);
}
#endif /* DO_HTPASSWD */
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