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/**
* @file dtls.c DTLS functions
*
* Copyright (C) 2010 Creytiv.com
*/
#define OPENSSL_NO_KRB5 1
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <re.h>
#include <baresip.h>
#include "dtls_srtp.h"
/* note: shadow struct in libre's tls module */
struct tls {
SSL_CTX *ctx;
char *pass; /* password for private key */
/* ... */
EVP_PKEY *key;
X509 *x;
};
static void destructor(void *data)
{
struct tls *tls = data;
if (tls->ctx)
SSL_CTX_free(tls->ctx);
if (tls->x)
X509_free(tls->x);
if (tls->key)
EVP_PKEY_free(tls->key);
mem_deref(tls->pass);
}
static int cert_generate(X509 *x, EVP_PKEY *privkey, const char *aor,
int expire_days)
{
X509_EXTENSION *ext;
X509_NAME *subj;
int ret;
int err = ENOMEM;
subj = X509_NAME_new();
if (!subj)
goto out;
X509_set_version(x, 2);
ASN1_INTEGER_set(X509_get_serialNumber(x), rand_u32());
ret = X509_NAME_add_entry_by_txt(subj, "CN", MBSTRING_ASC,
(unsigned char *)aor,
(int)strlen(aor), -1, 0);
if (!ret)
goto out;
if (!X509_set_issuer_name(x, subj) ||
!X509_set_subject_name(x, subj))
goto out;
X509_gmtime_adj(X509_get_notBefore(x), 0);
X509_gmtime_adj(X509_get_notAfter(x), 60*60*24*expire_days);
if (!X509_set_pubkey(x, privkey))
goto out;
ext = X509V3_EXT_conf_nid(NULL, NULL,
NID_basic_constraints, "CA:FALSE");
if (1 != X509_add_ext(x, ext, -1))
goto out;
X509_EXTENSION_free(ext);
err = 0;
out:
if (subj)
X509_NAME_free(subj);
return err;
}
static int tls_gen_selfsigned_cert(struct tls *tls, const char *aor)
{
RSA *rsa;
int err = ENOMEM;
rsa = RSA_generate_key(1024, RSA_F4, NULL, NULL);
if (!rsa)
goto out;
tls->key = EVP_PKEY_new();
if (!tls->key)
goto out;
if (!EVP_PKEY_set1_RSA(tls->key, rsa))
goto out;
tls->x = X509_new();
if (!tls->x)
goto out;
if (cert_generate(tls->x, tls->key, aor, 365))
goto out;
/* Sign the certificate */
if (!X509_sign(tls->x, tls->key, EVP_sha1()))
goto out;
err = 0;
out:
if (rsa)
RSA_free(rsa);
return err;
}
int dtls_alloc_selfsigned(struct tls **tlsp, const char *aor,
const char *srtp_profiles)
{
struct tls *tls;
int r, err;
if (!tlsp || !aor)
return EINVAL;
tls = mem_zalloc(sizeof(*tls), destructor);
if (!tls)
return ENOMEM;
SSL_library_init();
tls->ctx = SSL_CTX_new(DTLSv1_method());
if (!tls->ctx) {
err = ENOMEM;
goto out;
}
#if (OPENSSL_VERSION_NUMBER < 0x00905100L)
SSL_CTX_set_verify_depth(tls->ctx, 1);
#endif
SSL_CTX_set_read_ahead(tls->ctx, 1);
/* Generate self-signed certificate */
err = tls_gen_selfsigned_cert(tls, aor);
if (err) {
warning("dtls: failed to generate certificate (%s): %m\n",
aor, err);
goto out;
}
r = SSL_CTX_use_certificate(tls->ctx, tls->x);
if (r != 1) {
err = EINVAL;
goto out;
}
r = SSL_CTX_use_PrivateKey(tls->ctx, tls->key);
if (r != 1) {
err = EINVAL;
goto out;
}
if (0 != SSL_CTX_set_tlsext_use_srtp(tls->ctx, srtp_profiles)) {
warning("dtls: could not enable SRTP for profiles '%s'\n",
srtp_profiles);
err = ENOSYS;
goto out;
}
err = 0;
out:
if (err)
mem_deref(tls);
else
*tlsp = tls;
return err;
}
int dtls_print_sha1_fingerprint(struct re_printf *pf, const struct tls *tls)
{
uint8_t md[64];
unsigned int i, len;
int err = 0;
if (!pf || !tls)
return EINVAL;
len = sizeof(md);
if (1 != X509_digest(tls->x, EVP_sha1(), md, &len))
return ENOENT;
for (i=0; i<len; i++) {
err |= re_hprintf(pf, "%s%02x", i==0?"":":", md[i]);
}
return err;
}
int dtls_print_sha256_fingerprint(struct re_printf *pf, const struct tls *tls)
{
uint8_t md[64];
unsigned int i, len;
int err = 0;
if (!pf || !tls)
return EINVAL;
len = sizeof(md);
if (1 != X509_digest(tls->x, EVP_sha256(), md, &len))
return ENOENT;
for (i=0; i<len; i++) {
err |= re_hprintf(pf, "%s%02x", i==0?"":":", md[i]);
}
return err;
}
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