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/* tinyproxy - A fast light-weight HTTP proxy
* This file: Copyright (C) 2016-2017 rofl0r
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "main.h"
#include "basicauth.h"
#include "conns.h"
#include "heap.h"
#include "html-error.h"
#include "log.h"
#include "conf.h"
/* calculates number of bytes base64-encoded stream of N bytes will take. */
#define BASE64ENC_BYTES(N) (((N+2)/3)*4)
static const char base64_tbl[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* my own base64 impl (taken from libulz) */
static void base64enc(char *dst, const void* src, size_t count)
{
unsigned const char *s = src;
char* d = dst;
while(count) {
int i = 0, n = *s << 16;
s++;
count--;
if(count) {
n |= *s << 8;
s++;
count--;
i++;
}
if(count) {
n |= *s;
s++;
count--;
i++;
}
*d++ = base64_tbl[(n >> 18) & 0x3f];
*d++ = base64_tbl[(n >> 12) & 0x3f];
*d++ = i ? base64_tbl[(n >> 6) & 0x3f] : '=';
*d++ = i == 2 ? base64_tbl[n & 0x3f] : '=';
}
*d = 0;
}
/*
* Add entry to the basicauth list
*/
void basicauth_add (vector_t authlist,
const char *user, const char *pass)
{
char tmp[256+2];
char b[BASE64ENC_BYTES((sizeof tmp)-1) + 1];
int l;
size_t bl;
if (user == NULL || pass == NULL) {
log_message (LOG_WARNING,
"Illegal basicauth rule: missing user or pass");
return;
}
l = snprintf(tmp, sizeof tmp, "%s:%s", user, pass);
if(l >= (ssize_t) sizeof tmp) {
log_message (LOG_WARNING,
"User / pass in basicauth rule too long");
return;
}
base64enc(b, tmp, l);
bl = BASE64ENC_BYTES(l) + 1;
if (vector_append(authlist, b, bl) == -ENOMEM) {
log_message (LOG_ERR,
"Unable to allocate memory in basicauth_add()");
return;
}
log_message (LOG_INFO,
"Added basic auth user : %s", user);
}
/*
* Check if a user/password combination (encoded as base64)
* is in the basicauth list.
* return 1 on success, 0 on failure.
*/
int basicauth_check (vector_t authlist, const char *authstring)
{
ssize_t vl, i;
size_t al, el;
const char* entry;
vl = vector_length (authlist);
if (vl == -EINVAL) return 0;
al = strlen (authstring);
for (i = 0; i < vl; i++) {
entry = vector_getentry (authlist, i, &el);
if (strncmp (authstring, entry, al) == 0)
return 1;
}
return 0;
}
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