[exim.git] / src / src / tlscert-gnu.c

/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/* Copyright (c) Jeremy Harris 2014 - 2015 */

/* This file provides TLS/SSL support for Exim using the GnuTLS library,
one of the available supported implementations.  This file is #included into
tls.c when USE_GNUTLS has been set.
*/

#include <gnutls/gnutls.h>
/* needed for cert checks in verification and DN extraction: */
#include <gnutls/x509.h>
/* needed to disable PKCS11 autoload unless requested */
#if GNUTLS_VERSION_NUMBER >= 0x020c00
# include <gnutls/pkcs11.h>
#endif


/*****************************************************
*  Export/import a certificate, binary/printable
*****************************************************/
int
tls_export_cert(uschar * buf, size_t buflen, void * cert)
{
size_t sz = buflen;
void * reset_point = store_get(0);
int fail;
const uschar * cp;

if ((fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
    GNUTLS_X509_FMT_PEM, buf, &sz)))
  {
  log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
    gnutls_strerror(fail));
  return 1;
  }
if ((cp = string_printing(buf)) != buf)
  {
  Ustrncpy(buf, cp, buflen);
  if (buf[buflen-1])
    fail = 1;
  }
store_reset(reset_point);
return fail;
}

int
tls_import_cert(const uschar * buf, void ** cert)
{
void * reset_point = store_get(0);
gnutls_datum_t datum;
gnutls_x509_crt_t crt = *(gnutls_x509_crt_t *)cert;
int fail = 0;

if (crt)
  gnutls_x509_crt_deinit(crt);
else
  gnutls_global_init();

gnutls_x509_crt_init(&crt);

datum.data = string_unprinting(US buf);
datum.size = Ustrlen(datum.data);
if ((fail = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM)))
  {
  log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
    gnutls_strerror(fail));
  fail = 1;
  }
else
  *cert = (void *)crt;

store_reset(reset_point);
return fail;
}

void
tls_free_cert(void ** cert)
{
gnutls_x509_crt_t crt = *(gnutls_x509_crt_t *)cert;
if (crt)
  {
  gnutls_x509_crt_deinit(crt);
  gnutls_global_deinit();
  *cert = NULL;
  }
}

/*****************************************************
*  Certificate field extraction routines
*****************************************************/

/* First, some internal service functions */

static uschar *
g_err(const char * tag, const char * from, int gnutls_err)
{
expand_string_message = string_sprintf("%s: %s fail: %s\n",
  from, tag, gnutls_strerror(gnutls_err));
return NULL;
}


static uschar *
time_copy(time_t t, uschar * mod)
{
uschar * cp;
size_t len = 32;

if (mod && Ustrcmp(mod, "int") == 0)
  return string_sprintf("%u", (unsigned)t);

cp = store_get(len);
if (timestamps_utc)
  {
  uschar * tz = to_tz(US"GMT0");
  len = strftime(CS cp, len, "%b %e %T %Y %Z", gmtime(&t));
  restore_tz(tz);
  }
else
  len = strftime(CS cp, len, "%b %e %T %Y %Z", localtime(&t));
return len > 0 ? cp : NULL;
}


/**/
/* Now the extractors, called from expand.c
Arguments:
  cert		The certificate
  mod		Optional modifiers for the operator

Return:
  Allocated string with extracted value
*/

uschar *
tls_cert_issuer(void * cert, uschar * mod)
{
uschar * cp = NULL;
int ret;
size_t siz = 0;

if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz))
    != GNUTLS_E_SHORT_MEMORY_BUFFER)
  return g_err("gi0", __FUNCTION__, ret);

cp = store_get(siz);
if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz)) < 0)
  return g_err("gi1", __FUNCTION__, ret);

return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_not_after(void * cert, uschar * mod)
{
return time_copy(
  gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
  mod);
}

uschar *
tls_cert_not_before(void * cert, uschar * mod)
{
return time_copy(
  gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
  mod);
}

uschar *
tls_cert_serial_number(void * cert, uschar * mod)
{
uschar bin[50], txt[150];
size_t sz = sizeof(bin);
uschar * sp;
uschar * dp;
int ret;

if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
    bin, &sz)))
  return g_err("gs0", __FUNCTION__, ret);

for(dp = txt, sp = bin; sz; sz--)
  dp += sprintf(CS dp, "%.2x", *sp++);
for(sp = txt; sp[0]=='0' && sp[1]; ) sp++;	/* leading zeroes */
return string_copy(sp);
}

uschar *
tls_cert_signature(void * cert, uschar * mod)
{
uschar * cp1 = NULL;
uschar * cp2;
uschar * cp3;
size_t len = 0;
int ret;

if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len))
    != GNUTLS_E_SHORT_MEMORY_BUFFER)
  return g_err("gs0", __FUNCTION__, ret);

cp1 = store_get(len*4+1);
if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len) != 0)
  return g_err("gs1", __FUNCTION__, ret);

for(cp3 = cp2 = cp1+len; cp1 < cp2; cp1++)
  cp3 += sprintf(CS cp3, "%.2x ", *cp1);
cp3[-1]= '\0';

return cp2;
}

uschar *
tls_cert_signature_algorithm(void * cert, uschar * mod)
{
gnutls_sign_algorithm_t algo =
  gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
return algo < 0 ? NULL : string_copy(US gnutls_sign_get_name(algo));
}

uschar *
tls_cert_subject(void * cert, uschar * mod)
{
uschar * cp = NULL;
int ret;
size_t siz = 0;

if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz))
    != GNUTLS_E_SHORT_MEMORY_BUFFER)
  return g_err("gs0", __FUNCTION__, ret);

cp = store_get(siz);
if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz)) < 0)
  return g_err("gs1", __FUNCTION__, ret);

return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_version(void * cert, uschar * mod)
{
return string_sprintf("%d", gnutls_x509_crt_get_version(cert));
}

uschar *
tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
{
uschar * cp1 = NULL;
uschar * cp2;
uschar * cp3;
size_t siz = 0;
unsigned int crit;
int ret;

ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
  oid, idx, CS cp1, &siz, &crit);
if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
  return g_err("ge0", __FUNCTION__, ret);

cp1 = store_get(siz*4 + 1);

ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
  oid, idx, CS cp1, &siz, &crit);
if (ret < 0)
  return g_err("ge1", __FUNCTION__, ret);

/* binary data, DER encoded */

/* just dump for now */
for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp1++)
  cp3 += sprintf(CS cp3, "%.2x ", *cp1);
cp3[-1]= '\0';

return cp2;
}

uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
uschar * list = NULL;
int lsize = 0, llen = 0;
int index;
size_t siz;
int ret;
uschar sep = '\n';
uschar * tag = US"";
uschar * ele;
int match = -1;

while (mod)
  {
  if (*mod == '>' && *++mod) sep = *mod++;
  else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
  else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
  else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
  else continue;

  if (*mod++ != ',')
    break;
  }

for(index = 0;; index++)
  {
  siz = 0;
  switch(ret = gnutls_x509_crt_get_subject_alt_name(
      (gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
    {
    case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
      return list;	/* no more elements; normal exit */

    case GNUTLS_E_SHORT_MEMORY_BUFFER:
      break;

    default:
      return g_err("gs0", __FUNCTION__, ret);
    }

  ele = store_get(siz+1);
  if ((ret = gnutls_x509_crt_get_subject_alt_name(
    (gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
    return g_err("gs1", __FUNCTION__, ret);
  ele[siz] = '\0';

  if (  match != -1 && match != ret	/* wrong type of SAN */
     || Ustrlen(ele) != siz)		/* contains a NUL */
    continue;
  switch (ret)
    {
    case GNUTLS_SAN_DNSNAME:    tag = US"DNS";  break;
    case GNUTLS_SAN_URI:        tag = US"URI";  break;
    case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
    default: continue;        /* ignore unrecognised types */
    }
  list = string_append_listele(list, &lsize, &llen, sep,
          match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
  }
/*NOTREACHED*/
}

uschar *
tls_cert_ocsp_uri(void * cert, uschar * mod)
{
#if GNUTLS_VERSION_NUMBER >= 0x030000
gnutls_datum_t uri;
int ret;
uschar sep = '\n';
int index;
uschar * list = NULL;
int lsize = 0, llen = 0;

if (mod)
  if (*mod == '>' && *++mod) sep = *mod++;

for(index = 0;; index++)
  {
  ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
	  index, GNUTLS_IA_OCSP_URI, &uri, NULL);

  if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
    return list;
  if (ret < 0)
    return g_err("gai", __FUNCTION__, ret);

  list = string_append_listele_n(list, &lsize, &llen, sep,
	    uri.data, uri.size);
  }
/*NOTREACHED*/

#else

expand_string_message =
  string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
    __FUNCTION__);
return NULL;

#endif
}

uschar *
tls_cert_crl_uri(void * cert, uschar * mod)
{
int ret;
size_t siz;
uschar sep = '\n';
int index;
uschar * list = NULL;
int lsize = 0, llen = 0;
uschar * ele;

if (mod)
  if (*mod == '>' && *++mod) sep = *mod++;

for(index = 0;; index++)
  {
  siz = 0;
  switch(ret = gnutls_x509_crt_get_crl_dist_points(
    (gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
    {
    case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
      return list;
    case GNUTLS_E_SHORT_MEMORY_BUFFER:
      break;
    default:
      return g_err("gc0", __FUNCTION__, ret);
    }

  ele = store_get(siz);
  if ((ret = gnutls_x509_crt_get_crl_dist_points(
      (gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
    return g_err("gc1", __FUNCTION__, ret);

  list = string_append_listele_n(list, &lsize, &llen, sep, ele, siz);
  }
/*NOTREACHED*/
}


/*****************************************************
*  Certificate operator routines
*****************************************************/
uschar *
tls_cert_der_b64(void * cert)
{
size_t len = 0;
uschar * cp = NULL;
int fail;

if (  (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
	GNUTLS_X509_FMT_DER, cp, &len)) != GNUTLS_E_SHORT_MEMORY_BUFFER
   || !(cp = store_get((int)len))
   || (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
        GNUTLS_X509_FMT_DER, cp, &len))
   )
  {
  log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
    gnutls_strerror(fail));
  return NULL;
  }
return b64encode(cp, (int)len);
}


static uschar *
fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
{
int ret;
size_t siz = 0;
uschar * cp;
uschar * cp2;
uschar * cp3;

if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
    != GNUTLS_E_SHORT_MEMORY_BUFFER)
  return g_err("gf0", __FUNCTION__, ret);

cp = store_get(siz*3+1);
if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
  return g_err("gf1", __FUNCTION__, ret);

for (cp3 = cp2 = cp+siz; cp < cp2; cp++)
  cp3 += sprintf(CS cp3, "%02X", *cp);
return cp2;
}


uschar *
tls_cert_fprt_md5(void * cert)
{
return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_MD5);
}

uschar *
tls_cert_fprt_sha1(void * cert)
{
return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA1);
}

uschar *
tls_cert_fprt_sha256(void * cert)
{
return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA256);
}


/* vi: aw ai sw=2
*/
/* End of tlscert-gnu.c */
Commit	Line	Data
9d1c15ef JH	1	/*************************************************
	2	* Exim - an Internet mail transport agent *
	3	*************************************************/
	4
3386088d	5	/* Copyright (c) Jeremy Harris 2014 - 2015 */
9d1c15ef JH	6
	7	/* This file provides TLS/SSL support for Exim using the GnuTLS library,
	8	one of the available supported implementations. This file is #included into
	9	tls.c when USE_GNUTLS has been set.
	10	*/
	11
	12	#include <gnutls/gnutls.h>
	13	/* needed for cert checks in verification and DN extraction: */
	14	#include <gnutls/x509.h>
	15	/* needed to disable PKCS11 autoload unless requested */
	16	#if GNUTLS_VERSION_NUMBER >= 0x020c00
	17	# include <gnutls/pkcs11.h>
	18	#endif
	19
	20
	21	/*****************************************************
	22	* Export/import a certificate, binary/printable
	23	*****************************************************/
	24	int
	25	tls_export_cert(uschar * buf, size_t buflen, void * cert)
	26	{
	27	size_t sz = buflen;
	28	void * reset_point = store_get(0);
c03fae8a	29	int fail;
55414b25	30	const uschar * cp;
9d1c15ef	31
c03fae8a JH	32	if ((fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
	33	GNUTLS_X509_FMT_PEM, buf, &sz)))
	34	{
	35	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	36	gnutls_strerror(fail));
9d1c15ef	37	return 1;
c03fae8a	38	}
9d1c15ef JH	39	if ((cp = string_printing(buf)) != buf)
	40	{
	41	Ustrncpy(buf, cp, buflen);
	42	if (buf[buflen-1])
	43	fail = 1;
	44	}
	45	store_reset(reset_point);
	46	return fail;
	47	}
	48
	49	int
	50	tls_import_cert(const uschar * buf, void ** cert)
	51	{
	52	void * reset_point = store_get(0);
	53	gnutls_datum_t datum;
152e7604	54	gnutls_x509_crt_t crt = (gnutls_x509_crt_t )cert;
9d1c15ef JH	55	int fail = 0;
9d1c15ef JH	56
152e7604 JH	57	if (crt)
	58	gnutls_x509_crt_deinit(crt);
	59	else
	60	gnutls_global_init();
	61
9d1c15ef JH	62	gnutls_x509_crt_init(&crt);
	63
	64	datum.data = string_unprinting(US buf);
	65	datum.size = Ustrlen(datum.data);
c03fae8a JH	66	if ((fail = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM)))
	67	{
	68	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
	69	gnutls_strerror(fail));
9d1c15ef	70	fail = 1;
c03fae8a	71	}
9d1c15ef JH	72	else
	73	cert = (void )crt;
	74
	75	store_reset(reset_point);
	76	return fail;
	77	}
	78
	79	void
790fbb71	80	tls_free_cert(void ** cert)
9d1c15ef	81	{
790fbb71 JH	82	gnutls_x509_crt_t crt = (gnutls_x509_crt_t )cert;
	83	if (crt)
	84	{
	85	gnutls_x509_crt_deinit(crt);
	86	gnutls_global_deinit();
	87	*cert = NULL;
	88	}
9d1c15ef JH	89	}
	90
	91	/*****************************************************
	92	* Certificate field extraction routines
	93	*****************************************************/
c03fae8a JH	94
	95	/* First, some internal service functions */
	96
8a6eec04 JH	97	static uschar *
	98	g_err(const char * tag, const char * from, int gnutls_err)
	99	{
812a6045 JH	100	expand_string_message = string_sprintf("%s: %s fail: %s\n",
812a6045 JH	101	from, tag, gnutls_strerror(gnutls_err));
8a6eec04 JH	102	return NULL;
	103	}
	104
	105
9d1c15ef	106	static uschar *
25ba2544	107	time_copy(time_t t, uschar * mod)
9d1c15ef	108	{
25ba2544	109	uschar * cp;
e9477a08	110	size_t len = 32;
25ba2544 JH	111
	112	if (mod && Ustrcmp(mod, "int") == 0)
	113	return string_sprintf("%u", (unsigned)t);
	114
e9477a08 JH	115	cp = store_get(len);
	116	if (timestamps_utc)
	117	{
45500060	118	uschar * tz = to_tz(US"GMT0");
e9477a08 JH	119	len = strftime(CS cp, len, "%b %e %T %Y %Z", gmtime(&t));
	120	restore_tz(tz);
	121	}
	122	else
	123	len = strftime(CS cp, len, "%b %e %T %Y %Z", localtime(&t));
9d1c15ef JH	124	return len > 0 ? cp : NULL;
	125	}
	126
c03fae8a	127
9d1c15ef	128	/**/
c03fae8a JH	129	/* Now the extractors, called from expand.c
	130	Arguments:
	131	cert The certificate
	132	mod Optional modifiers for the operator
	133
	134	Return:
	135	Allocated string with extracted value
	136	*/
9d1c15ef JH	137
9d1c15ef JH	138	uschar *
9e4dddbd	139	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	140	{
812a6045 JH	141	uschar * cp = NULL;
	142	int ret;
	143	size_t siz = 0;
	144
76075bb5	145	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz))
812a6045 JH	146	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	147	return g_err("gi0", __FUNCTION__, ret);
	148
	149	cp = store_get(siz);
76075bb5	150	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz)) < 0)
812a6045 JH	151	return g_err("gi1", __FUNCTION__, ret);
	152
	153	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	154	}
	155
	156	uschar *
9e4dddbd	157	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef JH	158	{
9d1c15ef JH	159	return time_copy(
25ba2544 JH	160	gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
25ba2544 JH	161	mod);
9d1c15ef JH	162	}
	163
	164	uschar *
9e4dddbd	165	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef JH	166	{
9d1c15ef JH	167	return time_copy(
25ba2544 JH	168	gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
25ba2544 JH	169	mod);
9d1c15ef JH	170	}
	171
	172	uschar *
9e4dddbd	173	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	174	{
	175	uschar bin[50], txt[150];
	176	size_t sz = sizeof(bin);
	177	uschar * sp;
	178	uschar * dp;
c03fae8a JH	179	int ret;
	180
	181	if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
	182	bin, &sz)))
	183	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef	184
5976eb99 JH	185	for(dp = txt, sp = bin; sz; sz--)
5976eb99 JH	186	dp += sprintf(CS dp, "%.2x", *sp++);
9d1c15ef JH	187	for(sp = txt; sp[0]=='0' && sp[1]; ) sp++; /* leading zeroes */
	188	return string_copy(sp);
	189	}
	190
	191	uschar *
9e4dddbd	192	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef	193	{
69cbeaec	194	uschar * cp1 = NULL;
9d1c15ef JH	195	uschar * cp2;
	196	uschar * cp3;
	197	size_t len = 0;
	198	int ret;
	199
76075bb5	200	if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len))
812a6045 JH	201	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
812a6045 JH	202	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef JH	203
9d1c15ef JH	204	cp1 = store_get(len*4+1);
76075bb5	205	if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len) != 0)
812a6045	206	return g_err("gs1", __FUNCTION__, ret);
9d1c15ef	207
5976eb99 JH	208	for(cp3 = cp2 = cp1+len; cp1 < cp2; cp1++)
5976eb99 JH	209	cp3 += sprintf(CS cp3, "%.2x ", *cp1);
9d1c15ef JH	210	cp3[-1]= '\0';
	211
	212	return cp2;
	213	}
	214
	215	uschar *
9e4dddbd	216	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef JH	217	{
	218	gnutls_sign_algorithm_t algo =
	219	gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
76075bb5	220	return algo < 0 ? NULL : string_copy(US gnutls_sign_get_name(algo));
9d1c15ef JH	221	}
	222
	223	uschar *
9e4dddbd	224	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	225	{
8a6eec04 JH	226	uschar * cp = NULL;
	227	int ret;
	228	size_t siz = 0;
	229
76075bb5	230	if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz))
812a6045 JH	231	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
812a6045 JH	232	return g_err("gs0", __FUNCTION__, ret);
8a6eec04 JH	233
8a6eec04 JH	234	cp = store_get(siz);
76075bb5	235	if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz)) < 0)
812a6045	236	return g_err("gs1", __FUNCTION__, ret);
8a6eec04	237
812a6045	238	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	239	}
	240
	241	uschar *
9e4dddbd	242	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	243	{
	244	return string_sprintf("%d", gnutls_x509_crt_get_version(cert));
	245	}
	246
	247	uschar *
	248	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	249	{
	250	uschar * cp1 = NULL;
	251	uschar * cp2;
	252	uschar * cp3;
	253	size_t siz = 0;
	254	unsigned int crit;
	255	int ret;
	256
	257	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
76075bb5	258	oid, idx, CS cp1, &siz, &crit);
9d1c15ef	259	if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04	260	return g_err("ge0", __FUNCTION__, ret);
9d1c15ef JH	261
	262	cp1 = store_get(siz*4 + 1);
	263
	264	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
76075bb5	265	oid, idx, CS cp1, &siz, &crit);
9d1c15ef	266	if (ret < 0)
8a6eec04	267	return g_err("ge1", __FUNCTION__, ret);
9d1c15ef JH	268
	269	/* binary data, DER encoded */
	270
	271	/* just dump for now */
5976eb99 JH	272	for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp1++)
5976eb99 JH	273	cp3 += sprintf(CS cp3, "%.2x ", *cp1);
9d1c15ef JH	274	cp3[-1]= '\0';
	275
	276	return cp2;
	277	}
	278
	279	uschar *
9e4dddbd	280	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	281	{
9e4dddbd	282	uschar * list = NULL;
4226691b	283	int lsize = 0, llen = 0;
9e4dddbd JH	284	int index;
9e4dddbd JH	285	size_t siz;
9d1c15ef	286	int ret;
9e4dddbd JH	287	uschar sep = '\n';
	288	uschar * tag = US"";
	289	uschar * ele;
	290	int match = -1;
9d1c15ef	291
9e4dddbd	292	while (mod)
9d1c15ef	293	{
9e4dddbd JH	294	if (mod == '>' && ++mod) sep = *mod++;
	295	else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
	296	else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
	297	else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
	298	else continue;
	299
	300	if (*mod++ != ',')
9d1c15ef	301	break;
9d1c15ef JH	302	}
9d1c15ef JH	303
9e4dddbd	304	for(index = 0;; index++)
9d1c15ef	305	{
9e4dddbd JH	306	siz = 0;
9e4dddbd JH	307	switch(ret = gnutls_x509_crt_get_subject_alt_name(
e51c7be2	308	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
9e4dddbd JH	309	{
	310	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	311	return list; /* no more elements; normal exit */
	312
	313	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	314	break;
	315
	316	default:
8a6eec04	317	return g_err("gs0", __FUNCTION__, ret);
9e4dddbd JH	318	}
	319
	320	ele = store_get(siz+1);
	321	if ((ret = gnutls_x509_crt_get_subject_alt_name(
	322	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
8a6eec04	323	return g_err("gs1", __FUNCTION__, ret);
9e4dddbd JH	324	ele[siz] = '\0';
9e4dddbd JH	325
e51c7be2 JH	326	if ( match != -1 && match != ret /* wrong type of SAN */
e51c7be2 JH	327	\|\| Ustrlen(ele) != siz) /* contains a NUL */
9e4dddbd JH	328	continue;
	329	switch (ret)
	330	{
	331	case GNUTLS_SAN_DNSNAME: tag = US"DNS"; break;
94431adb	332	case GNUTLS_SAN_URI: tag = US"URI"; break;
9e4dddbd JH	333	case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
	334	default: continue; /* ignore unrecognised types */
	335	}
4226691b	336	list = string_append_listele(list, &lsize, &llen, sep,
9e4dddbd	337	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef	338	}
9e4dddbd	339	/NOTREACHED/
9d1c15ef JH	340	}
	341
	342	uschar *
9e4dddbd	343	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	344	{
	345	#if GNUTLS_VERSION_NUMBER >= 0x030000
	346	gnutls_datum_t uri;
9e4dddbd JH	347	int ret;
	348	uschar sep = '\n';
	349	int index;
	350	uschar * list = NULL;
4226691b	351	int lsize = 0, llen = 0;
9e4dddbd JH	352
	353	if (mod)
	354	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	355
9e4dddbd JH	356	for(index = 0;; index++)
	357	{
	358	ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
	359	index, GNUTLS_IA_OCSP_URI, &uri, NULL);
9d1c15ef	360
9e4dddbd JH	361	if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
	362	return list;
	363	if (ret < 0)
8a6eec04	364	return g_err("gai", __FUNCTION__, ret);
9d1c15ef	365
4226691b JH	366	list = string_append_listele_n(list, &lsize, &llen, sep,
4226691b JH	367	uri.data, uri.size);
9e4dddbd JH	368	}
9e4dddbd JH	369	/NOTREACHED/
9d1c15ef JH	370
	371	#else
	372
94431adb	373	expand_string_message =
9d1c15ef JH	374	string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
	375	__FUNCTION__);
	376	return NULL;
	377
	378	#endif
	379	}
	380
	381	uschar *
9e4dddbd	382	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	383	{
9d1c15ef JH	384	int ret;
9e4dddbd JH	385	size_t siz;
	386	uschar sep = '\n';
	387	int index;
	388	uschar * list = NULL;
4226691b	389	int lsize = 0, llen = 0;
9e4dddbd JH	390	uschar * ele;
	391
	392	if (mod)
	393	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	394
9e4dddbd	395	for(index = 0;; index++)
9d1c15ef	396	{
9e4dddbd JH	397	siz = 0;
	398	switch(ret = gnutls_x509_crt_get_crl_dist_points(
	399	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
	400	{
	401	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	402	return list;
	403	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	404	break;
	405	default:
8a6eec04	406	return g_err("gc0", __FUNCTION__, ret);
9e4dddbd JH	407	}
9e4dddbd JH	408
4226691b	409	ele = store_get(siz);
9e4dddbd	410	if ((ret = gnutls_x509_crt_get_crl_dist_points(
8a6eec04 JH	411	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
	412	return g_err("gc1", __FUNCTION__, ret);
	413
4226691b	414	list = string_append_listele_n(list, &lsize, &llen, sep, ele, siz);
9d1c15ef	415	}
9e4dddbd	416	/NOTREACHED/
9d1c15ef JH	417	}
	418
	419
6a8a60e0 JH	420	/*****************************************************
	421	* Certificate operator routines
	422	*****************************************************/
59b87190 JH	423	uschar *
	424	tls_cert_der_b64(void * cert)
	425	{
	426	size_t len = 0;
	427	uschar * cp = NULL;
	428	int fail;
	429
	430	if ( (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
	431	GNUTLS_X509_FMT_DER, cp, &len)) != GNUTLS_E_SHORT_MEMORY_BUFFER
	432	\|\| !(cp = store_get((int)len))
	433	\|\| (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
	434	GNUTLS_X509_FMT_DER, cp, &len))
	435	)
	436	{
	437	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	438	gnutls_strerror(fail));
	439	return NULL;
	440	}
	441	return b64encode(cp, (int)len);
	442	}
	443
	444
6a8a60e0 JH	445	static uschar *
	446	fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
	447	{
	448	int ret;
	449	size_t siz = 0;
	450	uschar * cp;
	451	uschar * cp2;
	452	uschar * cp3;
	453
	454	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
	455	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04 JH	456	return g_err("gf0", __FUNCTION__, ret);
8a6eec04 JH	457
6a8a60e0 JH	458	cp = store_get(siz*3+1);
6a8a60e0 JH	459	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
8a6eec04 JH	460	return g_err("gf1", __FUNCTION__, ret);
8a6eec04 JH	461
5976eb99 JH	462	for (cp3 = cp2 = cp+siz; cp < cp2; cp++)
5976eb99 JH	463	cp3 += sprintf(CS cp3, "%02X", *cp);
6a8a60e0 JH	464	return cp2;
	465	}
	466
	467
	468	uschar *
	469	tls_cert_fprt_md5(void * cert)
	470	{
	471	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_MD5);
	472	}
	473
	474	uschar *
	475	tls_cert_fprt_sha1(void * cert)
	476	{
	477	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA1);
	478	}
	479
9ef9101c JH	480	uschar *
	481	tls_cert_fprt_sha256(void * cert)
	482	{
	483	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA256);
	484	}
	485
6a8a60e0	486
9d1c15ef JH	487	/* vi: aw ai sw=2
	488	*/
	489	/* End of tlscert-gnu.c */