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

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

/* Copyright (c) Jeremy Harris 2014 */

/* 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;
int fail = 0;

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_deinit((gnutls_x509_crt_t) cert);
gnutls_global_deinit();
}

/*****************************************************
*  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, 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, 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; dp += 2, sp++, sz--)
  sprintf(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;
uschar * cp2;
uschar * cp3;
size_t len = 0;
int ret;

if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, 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, cp1, &len) != 0)
  return g_err("gs1", __FUNCTION__, ret);

for(cp3 = cp2 = cp1+len; cp1 < cp2; cp3 += 3, cp1++)
  sprintf(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(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, 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, 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, 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, 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; cp3 += 3, cp1++)
  sprintf(cp3, "%.2x ", *cp1);
cp3[-1]= '\0';

return cp2;
}

uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
uschar * list = NULL;
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, 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;

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(list, sep,
	    string_copyn(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;
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+1);
  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);

  ele[siz] = '\0';
  list = string_append_listele(list, sep, ele);
  }
/*NOTREACHED*/
}


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