[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 = 0;
uschar * cp;

if (gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
    GNUTLS_X509_FMT_PEM, buf, &sz))
  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 (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM))
  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
*****************************************************/
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;
struct tm * tp;
size_t len;

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

cp = store_get(32);
tp = gmtime(&t);
len = strftime(CS cp, 32, "%b %e %T %Y %Z", tp);
return len > 0 ? cp : NULL;
}

/**/

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;

if (gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
    bin, &sz) || sz > sizeof(bin))
  return NULL;
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
9d1c15ef JH	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 = 0;
	30	uschar * cp;
	31
	32	if (gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
	33	GNUTLS_X509_FMT_PEM, buf, &sz))
	34	return 1;
	35	if ((cp = string_printing(buf)) != buf)
	36	{
	37	Ustrncpy(buf, cp, buflen);
	38	if (buf[buflen-1])
	39	fail = 1;
	40	}
	41	store_reset(reset_point);
	42	return fail;
	43	}
	44
	45	int
	46	tls_import_cert(const uschar * buf, void ** cert)
	47	{
	48	void * reset_point = store_get(0);
	49	gnutls_datum_t datum;
	50	gnutls_x509_crt_t crt;
	51	int fail = 0;
	52
	53	gnutls_global_init();
	54	gnutls_x509_crt_init(&crt);
	55
	56	datum.data = string_unprinting(US buf);
	57	datum.size = Ustrlen(datum.data);
	58	if (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM))
	59	fail = 1;
	60	else
	61	cert = (void )crt;
	62
	63	store_reset(reset_point);
	64	return fail;
65	}
66
67	void
68	tls_free_cert(void * cert)
69	{
70	gnutls_x509_crt_deinit((gnutls_x509_crt_t) cert);
71	gnutls_global_deinit();
72	}
73
74	/*****************************************************
75	* Certificate field extraction routines
76	*****************************************************/
8a6eec04 JH	77	static uschar *
	78	g_err(const char * tag, const char * from, int gnutls_err)
	79	{
812a6045 JH	80	expand_string_message = string_sprintf("%s: %s fail: %s\n",
812a6045 JH	81	from, tag, gnutls_strerror(gnutls_err));
8a6eec04 JH	82	return NULL;
	83	}
	84
	85
9d1c15ef	86	static uschar *
25ba2544	87	time_copy(time_t t, uschar * mod)
9d1c15ef	88	{
25ba2544 JH	89	uschar * cp;
	90	struct tm * tp;
	91	size_t len;
	92
	93	if (mod && Ustrcmp(mod, "int") == 0)
	94	return string_sprintf("%u", (unsigned)t);
	95
	96	cp = store_get(32);
	97	tp = gmtime(&t);
	98	len = strftime(CS cp, 32, "%b %e %T %Y %Z", tp);
9d1c15ef JH	99	return len > 0 ? cp : NULL;
	100	}
	101
	102	/**/
	103
	104	uschar *
9e4dddbd	105	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	106	{
812a6045 JH	107	uschar * cp = NULL;
	108	int ret;
	109	size_t siz = 0;
	110
	111	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz))
	112	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	113	return g_err("gi0", __FUNCTION__, ret);
	114
	115	cp = store_get(siz);
	116	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz)) < 0)
	117	return g_err("gi1", __FUNCTION__, ret);
	118
	119	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	120	}
	121
	122	uschar *
9e4dddbd	123	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef JH	124	{
9d1c15ef JH	125	return time_copy(
25ba2544 JH	126	gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
25ba2544 JH	127	mod);
9d1c15ef JH	128	}
	129
	130	uschar *
9e4dddbd	131	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef JH	132	{
9d1c15ef JH	133	return time_copy(
25ba2544 JH	134	gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
25ba2544 JH	135	mod);
9d1c15ef JH	136	}
	137
	138	uschar *
9e4dddbd	139	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	140	{
	141	uschar bin[50], txt[150];
	142	size_t sz = sizeof(bin);
	143	uschar * sp;
	144	uschar * dp;
	145
	146	if (gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
	147	bin, &sz) \|\| sz > sizeof(bin))
	148	return NULL;
	149	for(dp = txt, sp = bin; sz; dp += 2, sp++, sz--)
	150	sprintf(dp, "%.2x", *sp);
	151	for(sp = txt; sp[0]=='0' && sp[1]; ) sp++; /* leading zeroes */
	152	return string_copy(sp);
	153	}
	154
	155	uschar *
9e4dddbd	156	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef JH	157	{
	158	uschar * cp1;
	159	uschar * cp2;
	160	uschar * cp3;
	161	size_t len = 0;
	162	int ret;
	163
812a6045 JH	164	if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len))
	165	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	166	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef JH	167
9d1c15ef JH	168	cp1 = store_get(len*4+1);
9d1c15ef	169	if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len) != 0)
812a6045	170	return g_err("gs1", __FUNCTION__, ret);
9d1c15ef JH	171
	172	for(cp3 = cp2 = cp1+len; cp1 < cp2; cp3 += 3, cp1++)
	173	sprintf(cp3, "%.2x ", *cp1);
	174	cp3[-1]= '\0';
	175
	176	return cp2;
	177	}
	178
	179	uschar *
9e4dddbd	180	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef JH	181	{
	182	gnutls_sign_algorithm_t algo =
	183	gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
	184	return algo < 0 ? NULL : string_copy(gnutls_sign_get_name(algo));
	185	}
	186
	187	uschar *
9e4dddbd	188	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	189	{
8a6eec04 JH	190	uschar * cp = NULL;
	191	int ret;
	192	size_t siz = 0;
	193
812a6045 JH	194	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz))
	195	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	196	return g_err("gs0", __FUNCTION__, ret);
8a6eec04 JH	197
8a6eec04 JH	198	cp = store_get(siz);
812a6045 JH	199	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz)) < 0)
812a6045 JH	200	return g_err("gs1", __FUNCTION__, ret);
8a6eec04	201
812a6045	202	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	203	}
	204
	205	uschar *
9e4dddbd	206	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	207	{
	208	return string_sprintf("%d", gnutls_x509_crt_get_version(cert));
	209	}
	210
	211	uschar *
	212	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	213	{
	214	uschar * cp1 = NULL;
	215	uschar * cp2;
	216	uschar * cp3;
	217	size_t siz = 0;
	218	unsigned int crit;
	219	int ret;
	220
	221	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	222	oid, idx, cp1, &siz, &crit);
	223	if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04	224	return g_err("ge0", __FUNCTION__, ret);
9d1c15ef JH	225
	226	cp1 = store_get(siz*4 + 1);
	227
	228	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	229	oid, idx, cp1, &siz, &crit);
	230	if (ret < 0)
8a6eec04	231	return g_err("ge1", __FUNCTION__, ret);
9d1c15ef JH	232
	233	/* binary data, DER encoded */
	234
	235	/* just dump for now */
	236	for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp3 += 3, cp1++)
	237	sprintf(cp3, "%.2x ", *cp1);
	238	cp3[-1]= '\0';
	239
	240	return cp2;
	241	}
	242
	243	uschar *
9e4dddbd	244	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	245	{
9e4dddbd JH	246	uschar * list = NULL;
	247	int index;
	248	size_t siz;
9d1c15ef	249	int ret;
9e4dddbd JH	250	uschar sep = '\n';
	251	uschar * tag = US"";
	252	uschar * ele;
	253	int match = -1;
9d1c15ef	254
9e4dddbd	255	while (mod)
9d1c15ef	256	{
9e4dddbd JH	257	if (mod == '>' && ++mod) sep = *mod++;
	258	else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
	259	else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
	260	else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
	261	else continue;
	262
	263	if (*mod++ != ',')
9d1c15ef	264	break;
9d1c15ef JH	265	}
9d1c15ef JH	266
9e4dddbd	267	for(index = 0;; index++)
9d1c15ef	268	{
9e4dddbd JH	269	siz = 0;
9e4dddbd JH	270	switch(ret = gnutls_x509_crt_get_subject_alt_name(
e51c7be2	271	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
9e4dddbd JH	272	{
	273	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	274	return list; /* no more elements; normal exit */
	275
	276	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	277	break;
	278
	279	default:
8a6eec04	280	return g_err("gs0", __FUNCTION__, ret);
9e4dddbd JH	281	}
	282
	283	ele = store_get(siz+1);
	284	if ((ret = gnutls_x509_crt_get_subject_alt_name(
	285	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
8a6eec04	286	return g_err("gs1", __FUNCTION__, ret);
9e4dddbd JH	287	ele[siz] = '\0';
9e4dddbd JH	288
e51c7be2 JH	289	if ( match != -1 && match != ret /* wrong type of SAN */
e51c7be2 JH	290	\|\| Ustrlen(ele) != siz) /* contains a NUL */
9e4dddbd JH	291	continue;
	292	switch (ret)
	293	{
	294	case GNUTLS_SAN_DNSNAME: tag = US"DNS"; break;
	295	case GNUTLS_SAN_URI: tag = US"URI"; break;
	296	case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
	297	default: continue; /* ignore unrecognised types */
	298	}
	299	list = string_append_listele(list, sep,
	300	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef	301	}
9e4dddbd	302	/NOTREACHED/
9d1c15ef JH	303	}
	304
	305	uschar *
9e4dddbd	306	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	307	{
	308	#if GNUTLS_VERSION_NUMBER >= 0x030000
	309	gnutls_datum_t uri;
9e4dddbd JH	310	int ret;
	311	uschar sep = '\n';
	312	int index;
	313	uschar * list = NULL;
	314
	315	if (mod)
	316	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	317
9e4dddbd JH	318	for(index = 0;; index++)
	319	{
	320	ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
	321	index, GNUTLS_IA_OCSP_URI, &uri, NULL);
9d1c15ef	322
9e4dddbd JH	323	if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
	324	return list;
	325	if (ret < 0)
8a6eec04	326	return g_err("gai", __FUNCTION__, ret);
9d1c15ef	327
9e4dddbd JH	328	list = string_append_listele(list, sep,
	329	string_copyn(uri.data, uri.size));
	330	}
	331	/NOTREACHED/
9d1c15ef JH	332
	333	#else
	334
	335	expand_string_message =
	336	string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
	337	__FUNCTION__);
	338	return NULL;
	339
	340	#endif
	341	}
	342
	343	uschar *
9e4dddbd	344	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	345	{
9d1c15ef JH	346	int ret;
9e4dddbd JH	347	size_t siz;
	348	uschar sep = '\n';
	349	int index;
	350	uschar * list = NULL;
	351	uschar * ele;
	352
	353	if (mod)
	354	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	355
9e4dddbd	356	for(index = 0;; index++)
9d1c15ef	357	{
9e4dddbd JH	358	siz = 0;
	359	switch(ret = gnutls_x509_crt_get_crl_dist_points(
	360	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
	361	{
	362	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	363	return list;
	364	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	365	break;
	366	default:
8a6eec04	367	return g_err("gc0", __FUNCTION__, ret);
9e4dddbd JH	368	}
	369
	370	ele = store_get(siz+1);
	371	if ((ret = gnutls_x509_crt_get_crl_dist_points(
8a6eec04 JH	372	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
	373	return g_err("gc1", __FUNCTION__, ret);
	374
9e4dddbd JH	375	ele[siz] = '\0';
9e4dddbd JH	376	list = string_append_listele(list, sep, ele);
9d1c15ef	377	}
9e4dddbd	378	/NOTREACHED/
9d1c15ef JH	379	}
	380
	381
6a8a60e0 JH	382	/*****************************************************
	383	* Certificate operator routines
	384	*****************************************************/
	385	static uschar *
	386	fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
	387	{
	388	int ret;
	389	size_t siz = 0;
	390	uschar * cp;
	391	uschar * cp2;
	392	uschar * cp3;
	393
	394	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
	395	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04 JH	396	return g_err("gf0", __FUNCTION__, ret);
8a6eec04 JH	397
6a8a60e0 JH	398	cp = store_get(siz*3+1);
6a8a60e0 JH	399	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
8a6eec04 JH	400	return g_err("gf1", __FUNCTION__, ret);
8a6eec04 JH	401
6a8a60e0 JH	402	for (cp3 = cp2 = cp+siz; cp < cp2; cp++, cp3+=2)
	403	sprintf(cp3, "%02X",*cp);
	404	return cp2;
	405	}
	406
	407
	408	uschar *
	409	tls_cert_fprt_md5(void * cert)
	410	{
	411	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_MD5);
	412	}
	413
	414	uschar *
	415	tls_cert_fprt_sha1(void * cert)
	416	{
	417	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA1);
	418	}
	419
9ef9101c JH	420	uschar *
	421	tls_cert_fprt_sha256(void * cert)
	422	{
	423	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA256);
	424	}
	425
6a8a60e0	426
9d1c15ef JH	427	/* vi: aw ai sw=2
	428	*/
	429	/* End of tlscert-gnu.c */