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/* This file is part of libvmod_basicauth
Copyright (C) 2013 Sergey Poznyakoff
Libvmod_basicauth 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 3, or (at your option)
any later version.
Libvmod_basicauth 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 libvmod_basicauth. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <stdbool.h>
#include <crypt.h>
#include "vrt.h"
#include "vcc_if.h"
#include "basicauth.h"
static int b64val[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1
};
static int
base64_decode(const unsigned char *input, size_t input_len,
unsigned char *output, size_t output_len)
{
unsigned char *out = output;
#define AC(c) do { if (--output_len == 0) return -1; *out++ = (c); } while (0)
if (!out)
return -1;
do {
if (input[0] > 127 || b64val[input[0]] == -1 ||
input[1] > 127 || b64val[input[1]] == -1 ||
input[2] > 127 ||
((input[2] != '=') && (b64val[input[2]] == -1)) ||
input[3] > 127 ||
((input[3] != '=') && (b64val[input[3]] == -1))) {
errno = EINVAL;
return -1;
}
AC((b64val[input[0]] << 2) | (b64val[input[1]] >> 4));
if (input[2] != '=') {
AC(((b64val[input[1]] << 4) & 0xf0) |
(b64val[input[2]] >> 2));
if (input[3] != '=')
AC(((b64val[input[2]] << 6) & 0xc0) |
b64val[input[3]]);
}
input += 4;
input_len -= 4;
} while (input_len > 0);
return out - output;
}
struct priv_data {
struct crypt_data cdat;
};
int
init_function(struct vmod_priv *priv, const struct VCL_conf *conf)
{
struct priv_data *p = malloc(sizeof(*p));
p->cdat.initialized = 0;
priv->priv = p;
priv->free = free;
return 0;
}
/* Matchers */
static int
crypt_match(const char *pass, const char *hash, struct priv_data *pd)
{
return strcmp(crypt_r(pass, hash, &pd->cdat), hash);
}
static int
plain_match(const char *pass, const char *hash, struct priv_data *pd)
{
return strcmp(pass, hash);
}
static int
apr_match(const char *pass, const char *hash, struct priv_data *pd)
{
unsigned char buf[120];
return strcmp(apr_md5_encode(pass, hash, buf, sizeof(buf)), hash);
}
/* Matcher table */
struct matcher {
char *cm_pfx;
size_t cm_len;
int (*cm_match)(const char *, const char *, struct priv_data *);
};
static struct matcher match_tab[] = {
#define S(s) #s, sizeof(#s)-1
{ S($apr1$), apr_match },
{ "", 0, crypt_match },
{ "", 0, plain_match },
{ NULL }
};
static int
match(const char *pass, const char *hash, struct priv_data *pd)
{
struct matcher *p;
size_t plen = strlen(pass);
for (p = match_tab; p->cm_match; p++) {
if (p->cm_len < plen &&
memcmp(p->cm_pfx, hash, p->cm_len) == 0 &&
p->cm_match(pass, hash, pd) == 0)
return 0;
}
return 1;
}
#define BASICPREF "Basic "
#define BASICLEN (sizeof(BASICPREF)-1)
unsigned
vmod_match(struct sess *sp, struct vmod_priv *priv,
const char *file, const char *s)
{
char buf[1024];
char lbuf[1024];
char *pass;
int n;
FILE *fp;
int rc;
// openlog("basicauth",LOG_NDELAY|LOG_PERROR|LOG_PID,LOG_AUTHPRIV);
if (!s || strncmp(s, BASICPREF, BASICLEN))
return false;
s += BASICLEN;
n = base64_decode(s, strlen(s), buf, sizeof(buf));
if (n < 0) {
syslog(LOG_AUTHPRIV|LOG_ERR, "cannot decode %s", s);
return false;
} else if (n == sizeof(buf)) {
syslog(LOG_AUTHPRIV|LOG_ERR, "hash too long");
return false;
}
buf[n] = 0;
// syslog(LOG_AUTHPRIV|LOG_DEBUG, "%s => %*.*s", s, n, n, buf);
pass = strchr(buf, ':');
if (!pass) {
syslog(LOG_AUTHPRIV|LOG_ERR, "invalid input");
return false;
}
*pass++ = 0;
fp = fopen(file, "r");
if (!fp) {
syslog(LOG_AUTHPRIV|LOG_ERR, "cannot open file %s: %m", file);
return false;
}
// syslog(LOG_AUTHPRIV|LOG_DEBUG, "scanning file %s", file);
rc = false;
while (fgets(lbuf, sizeof(lbuf), fp)) {
char *p, *q;
for (p = lbuf; *p && (*p == ' ' || *p == '\t'); p++);
if (*p == '#')
continue;
q = p + strlen(p);
if (q == p)
continue;
if (q[-1] == '\n')
*--q = 0;
if (!*p)
continue;
// syslog(LOG_AUTHPRIV|LOG_DEBUG, "LINE %s", p);
q = strchr(p, ':');
if (!q)
continue;
*q++ = 0;
if (strcmp(p, buf))
continue;
rc = match(pass, q, priv->priv) == 0;
// syslog(LOG_AUTHPRIV|LOG_DEBUG, "user=%s, rc=%d",p,rc);
break;
}
fclose(fp);
return rc;
}
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