[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;
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;
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;
}


/**/
/* 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
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);
c03fae8a	29	int fail;
9d1c15ef JH	30	uschar * cp;
9d1c15ef JH	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;
	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);
c03fae8a JH	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));
9d1c15ef	66	fail = 1;
c03fae8a	67	}
9d1c15ef JH	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	*****************************************************/
c03fae8a JH	85
	86	/* First, some internal service functions */
	87
8a6eec04 JH	88	static uschar *
	89	g_err(const char * tag, const char * from, int gnutls_err)
	90	{
812a6045 JH	91	expand_string_message = string_sprintf("%s: %s fail: %s\n",
812a6045 JH	92	from, tag, gnutls_strerror(gnutls_err));
8a6eec04 JH	93	return NULL;
	94	}
	95
	96
9d1c15ef	97	static uschar *
25ba2544	98	time_copy(time_t t, uschar * mod)
9d1c15ef	99	{
25ba2544 JH	100	uschar * cp;
	101	struct tm * tp;
	102	size_t len;
	103
	104	if (mod && Ustrcmp(mod, "int") == 0)
	105	return string_sprintf("%u", (unsigned)t);
	106
	107	cp = store_get(32);
	108	tp = gmtime(&t);
	109	len = strftime(CS cp, 32, "%b %e %T %Y %Z", tp);
9d1c15ef JH	110	return len > 0 ? cp : NULL;
	111	}
	112
c03fae8a	113
9d1c15ef	114	/**/
c03fae8a JH	115	/* Now the extractors, called from expand.c
	116	Arguments:
	117	cert The certificate
	118	mod Optional modifiers for the operator
	119
	120	Return:
	121	Allocated string with extracted value
	122	*/
9d1c15ef JH	123
9d1c15ef JH	124	uschar *
9e4dddbd	125	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	126	{
812a6045 JH	127	uschar * cp = NULL;
	128	int ret;
	129	size_t siz = 0;
	130
	131	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz))
	132	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	133	return g_err("gi0", __FUNCTION__, ret);
	134
	135	cp = store_get(siz);
	136	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz)) < 0)
	137	return g_err("gi1", __FUNCTION__, ret);
	138
	139	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	140	}
	141
	142	uschar *
9e4dddbd	143	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef JH	144	{
9d1c15ef JH	145	return time_copy(
25ba2544 JH	146	gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
25ba2544 JH	147	mod);
9d1c15ef JH	148	}
	149
	150	uschar *
9e4dddbd	151	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef JH	152	{
9d1c15ef JH	153	return time_copy(
25ba2544 JH	154	gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
25ba2544 JH	155	mod);
9d1c15ef JH	156	}
	157
	158	uschar *
9e4dddbd	159	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	160	{
	161	uschar bin[50], txt[150];
	162	size_t sz = sizeof(bin);
	163	uschar * sp;
	164	uschar * dp;
c03fae8a JH	165	int ret;
	166
	167	if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
	168	bin, &sz)))
	169	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef	170
9d1c15ef JH	171	for(dp = txt, sp = bin; sz; dp += 2, sp++, sz--)
	172	sprintf(dp, "%.2x", *sp);
	173	for(sp = txt; sp[0]=='0' && sp[1]; ) sp++; /* leading zeroes */
	174	return string_copy(sp);
	175	}
	176
	177	uschar *
9e4dddbd	178	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef JH	179	{
	180	uschar * cp1;
	181	uschar * cp2;
	182	uschar * cp3;
	183	size_t len = 0;
	184	int ret;
	185
812a6045 JH	186	if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len))
	187	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	188	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef JH	189
9d1c15ef JH	190	cp1 = store_get(len*4+1);
9d1c15ef	191	if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len) != 0)
812a6045	192	return g_err("gs1", __FUNCTION__, ret);
9d1c15ef JH	193
	194	for(cp3 = cp2 = cp1+len; cp1 < cp2; cp3 += 3, cp1++)
	195	sprintf(cp3, "%.2x ", *cp1);
	196	cp3[-1]= '\0';
	197
	198	return cp2;
	199	}
	200
	201	uschar *
9e4dddbd	202	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef JH	203	{
	204	gnutls_sign_algorithm_t algo =
	205	gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
	206	return algo < 0 ? NULL : string_copy(gnutls_sign_get_name(algo));
	207	}
	208
	209	uschar *
9e4dddbd	210	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	211	{
8a6eec04 JH	212	uschar * cp = NULL;
	213	int ret;
	214	size_t siz = 0;
	215
812a6045 JH	216	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz))
	217	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	218	return g_err("gs0", __FUNCTION__, ret);
8a6eec04 JH	219
8a6eec04 JH	220	cp = store_get(siz);
812a6045 JH	221	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz)) < 0)
812a6045 JH	222	return g_err("gs1", __FUNCTION__, ret);
8a6eec04	223
812a6045	224	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	225	}
	226
	227	uschar *
9e4dddbd	228	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	229	{
	230	return string_sprintf("%d", gnutls_x509_crt_get_version(cert));
	231	}
	232
	233	uschar *
	234	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	235	{
	236	uschar * cp1 = NULL;
	237	uschar * cp2;
	238	uschar * cp3;
	239	size_t siz = 0;
	240	unsigned int crit;
	241	int ret;
	242
	243	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	244	oid, idx, cp1, &siz, &crit);
	245	if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04	246	return g_err("ge0", __FUNCTION__, ret);
9d1c15ef JH	247
	248	cp1 = store_get(siz*4 + 1);
	249
	250	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	251	oid, idx, cp1, &siz, &crit);
	252	if (ret < 0)
8a6eec04	253	return g_err("ge1", __FUNCTION__, ret);
9d1c15ef JH	254
	255	/* binary data, DER encoded */
	256
	257	/* just dump for now */
	258	for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp3 += 3, cp1++)
	259	sprintf(cp3, "%.2x ", *cp1);
	260	cp3[-1]= '\0';
	261
	262	return cp2;
	263	}
	264
	265	uschar *
9e4dddbd	266	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	267	{
9e4dddbd JH	268	uschar * list = NULL;
	269	int index;
	270	size_t siz;
9d1c15ef	271	int ret;
9e4dddbd JH	272	uschar sep = '\n';
	273	uschar * tag = US"";
	274	uschar * ele;
	275	int match = -1;
9d1c15ef	276
9e4dddbd	277	while (mod)
9d1c15ef	278	{
9e4dddbd JH	279	if (mod == '>' && ++mod) sep = *mod++;
	280	else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
	281	else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
	282	else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
	283	else continue;
	284
	285	if (*mod++ != ',')
9d1c15ef	286	break;
9d1c15ef JH	287	}
9d1c15ef JH	288
9e4dddbd	289	for(index = 0;; index++)
9d1c15ef	290	{
9e4dddbd JH	291	siz = 0;
9e4dddbd JH	292	switch(ret = gnutls_x509_crt_get_subject_alt_name(
e51c7be2	293	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
9e4dddbd JH	294	{
	295	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	296	return list; /* no more elements; normal exit */
	297
	298	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	299	break;
	300
	301	default:
8a6eec04	302	return g_err("gs0", __FUNCTION__, ret);
9e4dddbd JH	303	}
	304
	305	ele = store_get(siz+1);
	306	if ((ret = gnutls_x509_crt_get_subject_alt_name(
	307	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
8a6eec04	308	return g_err("gs1", __FUNCTION__, ret);
9e4dddbd JH	309	ele[siz] = '\0';
9e4dddbd JH	310
e51c7be2 JH	311	if ( match != -1 && match != ret /* wrong type of SAN */
e51c7be2 JH	312	\|\| Ustrlen(ele) != siz) /* contains a NUL */
9e4dddbd JH	313	continue;
	314	switch (ret)
	315	{
	316	case GNUTLS_SAN_DNSNAME: tag = US"DNS"; break;
	317	case GNUTLS_SAN_URI: tag = US"URI"; break;
	318	case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
	319	default: continue; /* ignore unrecognised types */
	320	}
	321	list = string_append_listele(list, sep,
	322	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef	323	}
9e4dddbd	324	/NOTREACHED/
9d1c15ef JH	325	}
	326
	327	uschar *
9e4dddbd	328	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	329	{
	330	#if GNUTLS_VERSION_NUMBER >= 0x030000
	331	gnutls_datum_t uri;
9e4dddbd JH	332	int ret;
	333	uschar sep = '\n';
	334	int index;
	335	uschar * list = NULL;
	336
	337	if (mod)
	338	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	339
9e4dddbd JH	340	for(index = 0;; index++)
	341	{
	342	ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
	343	index, GNUTLS_IA_OCSP_URI, &uri, NULL);
9d1c15ef	344
9e4dddbd JH	345	if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
	346	return list;
	347	if (ret < 0)
8a6eec04	348	return g_err("gai", __FUNCTION__, ret);
9d1c15ef	349
9e4dddbd JH	350	list = string_append_listele(list, sep,
	351	string_copyn(uri.data, uri.size));
	352	}
	353	/NOTREACHED/
9d1c15ef JH	354
	355	#else
	356
	357	expand_string_message =
	358	string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
	359	__FUNCTION__);
	360	return NULL;
	361
	362	#endif
	363	}
	364
	365	uschar *
9e4dddbd	366	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	367	{
9d1c15ef JH	368	int ret;
9e4dddbd JH	369	size_t siz;
	370	uschar sep = '\n';
	371	int index;
	372	uschar * list = NULL;
	373	uschar * ele;
	374
	375	if (mod)
	376	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	377
9e4dddbd	378	for(index = 0;; index++)
9d1c15ef	379	{
9e4dddbd JH	380	siz = 0;
	381	switch(ret = gnutls_x509_crt_get_crl_dist_points(
	382	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
	383	{
	384	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	385	return list;
	386	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	387	break;
	388	default:
8a6eec04	389	return g_err("gc0", __FUNCTION__, ret);
9e4dddbd JH	390	}
	391
	392	ele = store_get(siz+1);
	393	if ((ret = gnutls_x509_crt_get_crl_dist_points(
8a6eec04 JH	394	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
	395	return g_err("gc1", __FUNCTION__, ret);
	396
9e4dddbd JH	397	ele[siz] = '\0';
9e4dddbd JH	398	list = string_append_listele(list, sep, ele);
9d1c15ef	399	}
9e4dddbd	400	/NOTREACHED/
9d1c15ef JH	401	}
	402
	403
6a8a60e0 JH	404	/*****************************************************
	405	* Certificate operator routines
	406	*****************************************************/
	407	static uschar *
	408	fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
	409	{
	410	int ret;
	411	size_t siz = 0;
	412	uschar * cp;
	413	uschar * cp2;
	414	uschar * cp3;
	415
	416	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
	417	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04 JH	418	return g_err("gf0", __FUNCTION__, ret);
8a6eec04 JH	419
6a8a60e0 JH	420	cp = store_get(siz*3+1);
6a8a60e0 JH	421	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
8a6eec04 JH	422	return g_err("gf1", __FUNCTION__, ret);
8a6eec04 JH	423
6a8a60e0 JH	424	for (cp3 = cp2 = cp+siz; cp < cp2; cp++, cp3+=2)
	425	sprintf(cp3, "%02X",*cp);
	426	return cp2;
	427	}
	428
	429
	430	uschar *
	431	tls_cert_fprt_md5(void * cert)
	432	{
	433	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_MD5);
	434	}
	435
	436	uschar *
	437	tls_cert_fprt_sha1(void * cert)
	438	{
	439	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA1);
	440	}
	441
9ef9101c JH	442	uschar *
	443	tls_cert_fprt_sha256(void * cert)
	444	{
	445	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA256);
	446	}
	447
6a8a60e0	448
9d1c15ef JH	449	/* vi: aw ai sw=2
	450	*/
	451	/* End of tlscert-gnu.c */