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#include <config.h>
#include <errno.h>
#include <pthread.h>
#include <crypt.h>
#include <string.h>
#include "sha1.h"
#include "md5.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;
}
static pthread_mutex_t crypt_mutex = PTHREAD_MUTEX_INITIALIZER;
static int
crypt_match(const char *pass, const char *hash)
{
int res = 1;
char *cp;
pthread_mutex_lock(&crypt_mutex);
cp = crypt(pass, hash);
if (cp)
res = strcmp(cp, hash);
pthread_mutex_unlock(&crypt_mutex);
return res;
}
static int
plain_match(const char *pass, const char *hash)
{
return strcmp(pass, hash);
}
static int
apr_match(const char *pass, const char *hash)
{
char buf[120];
char *cp = apr_md5_encode(pass, hash, buf, sizeof(buf));
return cp ? strcmp(cp, hash) : 1;
}
#define SHA1_DIGEST_SIZE 20
static int
sha1_match(const char *pass, const char *hash)
{
char hashbuf[SHA1_DIGEST_SIZE], resbuf[SHA1_DIGEST_SIZE];
int n;
hash += 5; /* Skip past {SHA} */
n = base64_decode((const unsigned char *)hash, strlen(hash),
(unsigned char *)hashbuf, sizeof(hashbuf));
if (n < 0) {
/* FIXME: error("cannot decode %s", hash); */
return 1;
}
if (n != SHA1_DIGEST_SIZE) {
/* FIXME: error("bad hash length: %s %d", hash, n); */
return 1;
}
sha1_buffer(pass, strlen(pass), resbuf);
return memcmp(resbuf, hashbuf, SHA1_DIGEST_SIZE);
}
/* Matcher table */
struct matcher {
char *cm_pfx;
size_t cm_len;
int (*cm_match)(const char *, const char *);
};
static struct matcher match_tab[] = {
#define S(s) #s, sizeof(#s)-1
{ S($apr1$), apr_match },
{ S({SHA}), sha1_match },
{ "", 0, crypt_match },
{ "", 0, plain_match },
{ NULL }
};
static int
match(const char *pass, const char *hash)
{
struct matcher *p;
size_t plen = strlen(hash);
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) == 0)
return 0;
}
return 1;
}
#define BASICPREF "Basic "
#define BASICLEN (sizeof(BASICPREF)-1)
BASICAUTH_RESULT
basicauth(char const *file, char const *input)
{
char buf[1024];
char lbuf[1024];
char *pass;
int n;
FILE *fp;
BASICAUTH_RESULT rc;
if (!input || strncmp(input, BASICPREF, BASICLEN))
return BASICAUTH_BAD_INPUT;
input += BASICLEN;
n = base64_decode((const unsigned char *)input, strlen(input),
(unsigned char *)buf, sizeof(buf));
if (n < 0) {
return BASICAUTH_BAD_INPUT;
} else if (n == sizeof(buf)) {
return BASICAUTH_BAD_INPUT;
}
buf[n] = 0;
pass = strchr(buf, ':');
if (!pass)
return BASICAUTH_BAD_INPUT;
*pass++ = 0;
fp = fopen(file, "r");
if (!fp)
return BASICAUTH_CANT_OPEN;
rc = BASICAUTH_DENY;
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;
q = strchr(p, ':');
if (!q)
continue;
*q++ = 0;
if (strcmp(p, buf))
continue;
rc = match(pass, q) ? BASICAUTH_DENY : BASICAUTH_ALLOW;
break;
}
fclose(fp);
return rc;
}
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