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/**
* @file sip/auth.c Mock SIP server -- authentication
*
* Copyright (C) 2010 - 2016 Creytiv.com
*/
#include <string.h>
#include <time.h>
#include <re.h>
#include "sipsrv.h"
enum {
NONCE_MIN_SIZE = 33,
};
int auth_print(struct re_printf *pf, const struct auth *auth)
{
uint8_t key[MD5_SIZE];
uint64_t nv[2];
if (!auth)
return EINVAL;
nv[0] = time(NULL);
nv[1] = auth->srv->secret;
md5((uint8_t *)nv, sizeof(nv), key);
return re_hprintf(pf,
"Digest realm=\"%s\", nonce=\"%w%llx\", "
"qop=\"auth\"%s",
auth->realm,
key, sizeof(key), nv[0],
auth->stale ? ", stale=true" : "");
}
int auth_chk_nonce(struct sip_server *srv,
const struct pl *nonce, uint32_t expires)
{
uint8_t nkey[MD5_SIZE], ckey[MD5_SIZE];
uint64_t nv[2];
struct pl pl;
int64_t age;
unsigned i;
if (!nonce || !nonce->p || nonce->l < NONCE_MIN_SIZE)
return EINVAL;
pl = *nonce;
for (i=0; i<sizeof(nkey); i++) {
nkey[i] = ch_hex(*pl.p++) << 4;
nkey[i] += ch_hex(*pl.p++);
pl.l -= 2;
}
nv[0] = pl_x64(&pl);
nv[1] = srv->secret;
md5((uint8_t *)nv, sizeof(nv), ckey);
if (memcmp(nkey, ckey, MD5_SIZE))
return EAUTH;
age = time(NULL) - nv[0];
if (age < 0 || age > expires)
return ETIMEDOUT;
return 0;
}
int auth_set_realm(struct auth *auth, const char *realm)
{
size_t len;
if (!auth || !realm)
return EINVAL;
len = strlen(realm);
if (len >= sizeof(auth->realm))
return ENOMEM;
memcpy(auth->realm, realm, len);
auth->realm[len] = '\0';
return 0;
}
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