[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_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 = NULL;
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
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
	80	tls_free_cert(void * cert)
	81	{
	82	gnutls_x509_crt_deinit((gnutls_x509_crt_t) cert);
	83	gnutls_global_deinit();
	84	}
	85
	86	/*****************************************************
	87	* Certificate field extraction routines
	88	*****************************************************/
c03fae8a JH	89
	90	/* First, some internal service functions */
	91
8a6eec04 JH	92	static uschar *
	93	g_err(const char * tag, const char * from, int gnutls_err)
	94	{
812a6045 JH	95	expand_string_message = string_sprintf("%s: %s fail: %s\n",
812a6045 JH	96	from, tag, gnutls_strerror(gnutls_err));
8a6eec04 JH	97	return NULL;
	98	}
	99
	100
9d1c15ef	101	static uschar *
25ba2544	102	time_copy(time_t t, uschar * mod)
9d1c15ef	103	{
25ba2544	104	uschar * cp;
e9477a08	105	size_t len = 32;
25ba2544 JH	106
	107	if (mod && Ustrcmp(mod, "int") == 0)
	108	return string_sprintf("%u", (unsigned)t);
	109
e9477a08 JH	110	cp = store_get(len);
	111	if (timestamps_utc)
	112	{
45500060	113	uschar * tz = to_tz(US"GMT0");
e9477a08 JH	114	len = strftime(CS cp, len, "%b %e %T %Y %Z", gmtime(&t));
	115	restore_tz(tz);
	116	}
	117	else
	118	len = strftime(CS cp, len, "%b %e %T %Y %Z", localtime(&t));
9d1c15ef JH	119	return len > 0 ? cp : NULL;
	120	}
	121
c03fae8a	122
9d1c15ef	123	/**/
c03fae8a JH	124	/* Now the extractors, called from expand.c
	125	Arguments:
	126	cert The certificate
	127	mod Optional modifiers for the operator
	128
	129	Return:
	130	Allocated string with extracted value
	131	*/
9d1c15ef JH	132
9d1c15ef JH	133	uschar *
9e4dddbd	134	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	135	{
812a6045 JH	136	uschar * cp = NULL;
	137	int ret;
	138	size_t siz = 0;
	139
	140	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz))
	141	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	142	return g_err("gi0", __FUNCTION__, ret);
	143
	144	cp = store_get(siz);
	145	if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz)) < 0)
	146	return g_err("gi1", __FUNCTION__, ret);
	147
	148	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	149	}
	150
	151	uschar *
9e4dddbd	152	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef JH	153	{
9d1c15ef JH	154	return time_copy(
25ba2544 JH	155	gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
25ba2544 JH	156	mod);
9d1c15ef JH	157	}
	158
	159	uschar *
9e4dddbd	160	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef JH	161	{
9d1c15ef JH	162	return time_copy(
25ba2544 JH	163	gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
25ba2544 JH	164	mod);
9d1c15ef JH	165	}
	166
	167	uschar *
9e4dddbd	168	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	169	{
	170	uschar bin[50], txt[150];
	171	size_t sz = sizeof(bin);
	172	uschar * sp;
	173	uschar * dp;
c03fae8a JH	174	int ret;
	175
	176	if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
	177	bin, &sz)))
	178	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef	179
9d1c15ef JH	180	for(dp = txt, sp = bin; sz; dp += 2, sp++, sz--)
	181	sprintf(dp, "%.2x", *sp);
	182	for(sp = txt; sp[0]=='0' && sp[1]; ) sp++; /* leading zeroes */
	183	return string_copy(sp);
	184	}
	185
	186	uschar *
9e4dddbd	187	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef	188	{
69cbeaec	189	uschar * cp1 = NULL;
9d1c15ef JH	190	uschar * cp2;
	191	uschar * cp3;
	192	size_t len = 0;
	193	int ret;
	194
812a6045 JH	195	if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len))
	196	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	197	return g_err("gs0", __FUNCTION__, ret);
9d1c15ef JH	198
9d1c15ef JH	199	cp1 = store_get(len*4+1);
9d1c15ef	200	if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len) != 0)
812a6045	201	return g_err("gs1", __FUNCTION__, ret);
9d1c15ef JH	202
	203	for(cp3 = cp2 = cp1+len; cp1 < cp2; cp3 += 3, cp1++)
	204	sprintf(cp3, "%.2x ", *cp1);
	205	cp3[-1]= '\0';
	206
	207	return cp2;
	208	}
	209
	210	uschar *
9e4dddbd	211	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef JH	212	{
	213	gnutls_sign_algorithm_t algo =
	214	gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
	215	return algo < 0 ? NULL : string_copy(gnutls_sign_get_name(algo));
	216	}
	217
	218	uschar *
9e4dddbd	219	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	220	{
8a6eec04 JH	221	uschar * cp = NULL;
	222	int ret;
	223	size_t siz = 0;
	224
812a6045 JH	225	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz))
	226	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
	227	return g_err("gs0", __FUNCTION__, ret);
8a6eec04 JH	228
8a6eec04 JH	229	cp = store_get(siz);
812a6045 JH	230	if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz)) < 0)
812a6045 JH	231	return g_err("gs1", __FUNCTION__, ret);
8a6eec04	232
812a6045	233	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	234	}
	235
	236	uschar *
9e4dddbd	237	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	238	{
	239	return string_sprintf("%d", gnutls_x509_crt_get_version(cert));
	240	}
	241
	242	uschar *
	243	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	244	{
	245	uschar * cp1 = NULL;
	246	uschar * cp2;
	247	uschar * cp3;
	248	size_t siz = 0;
	249	unsigned int crit;
	250	int ret;
	251
	252	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	253	oid, idx, cp1, &siz, &crit);
	254	if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04	255	return g_err("ge0", __FUNCTION__, ret);
9d1c15ef JH	256
	257	cp1 = store_get(siz*4 + 1);
	258
	259	ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
	260	oid, idx, cp1, &siz, &crit);
	261	if (ret < 0)
8a6eec04	262	return g_err("ge1", __FUNCTION__, ret);
9d1c15ef JH	263
	264	/* binary data, DER encoded */
	265
	266	/* just dump for now */
	267	for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp3 += 3, cp1++)
	268	sprintf(cp3, "%.2x ", *cp1);
	269	cp3[-1]= '\0';
	270
	271	return cp2;
	272	}
	273
	274	uschar *
9e4dddbd	275	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	276	{
9e4dddbd JH	277	uschar * list = NULL;
	278	int index;
	279	size_t siz;
9d1c15ef	280	int ret;
9e4dddbd JH	281	uschar sep = '\n';
	282	uschar * tag = US"";
	283	uschar * ele;
	284	int match = -1;
9d1c15ef	285
9e4dddbd	286	while (mod)
9d1c15ef	287	{
9e4dddbd JH	288	if (mod == '>' && ++mod) sep = *mod++;
	289	else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
	290	else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
	291	else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
	292	else continue;
	293
	294	if (*mod++ != ',')
9d1c15ef	295	break;
9d1c15ef JH	296	}
9d1c15ef JH	297
9e4dddbd	298	for(index = 0;; index++)
9d1c15ef	299	{
9e4dddbd JH	300	siz = 0;
9e4dddbd JH	301	switch(ret = gnutls_x509_crt_get_subject_alt_name(
e51c7be2	302	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
9e4dddbd JH	303	{
	304	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	305	return list; /* no more elements; normal exit */
	306
	307	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	308	break;
	309
	310	default:
8a6eec04	311	return g_err("gs0", __FUNCTION__, ret);
9e4dddbd JH	312	}
	313
	314	ele = store_get(siz+1);
	315	if ((ret = gnutls_x509_crt_get_subject_alt_name(
	316	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
8a6eec04	317	return g_err("gs1", __FUNCTION__, ret);
9e4dddbd JH	318	ele[siz] = '\0';
9e4dddbd JH	319
e51c7be2 JH	320	if ( match != -1 && match != ret /* wrong type of SAN */
e51c7be2 JH	321	\|\| Ustrlen(ele) != siz) /* contains a NUL */
9e4dddbd JH	322	continue;
	323	switch (ret)
	324	{
	325	case GNUTLS_SAN_DNSNAME: tag = US"DNS"; break;
	326	case GNUTLS_SAN_URI: tag = US"URI"; break;
	327	case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
	328	default: continue; /* ignore unrecognised types */
	329	}
	330	list = string_append_listele(list, sep,
	331	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef	332	}
9e4dddbd	333	/NOTREACHED/
9d1c15ef JH	334	}
	335
	336	uschar *
9e4dddbd	337	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	338	{
	339	#if GNUTLS_VERSION_NUMBER >= 0x030000
	340	gnutls_datum_t uri;
9e4dddbd JH	341	int ret;
	342	uschar sep = '\n';
	343	int index;
	344	uschar * list = NULL;
	345
	346	if (mod)
	347	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	348
9e4dddbd JH	349	for(index = 0;; index++)
	350	{
	351	ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
	352	index, GNUTLS_IA_OCSP_URI, &uri, NULL);
9d1c15ef	353
9e4dddbd JH	354	if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
	355	return list;
	356	if (ret < 0)
8a6eec04	357	return g_err("gai", __FUNCTION__, ret);
9d1c15ef	358
9e4dddbd JH	359	list = string_append_listele(list, sep,
	360	string_copyn(uri.data, uri.size));
	361	}
	362	/NOTREACHED/
9d1c15ef JH	363
	364	#else
	365
	366	expand_string_message =
	367	string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
	368	__FUNCTION__);
	369	return NULL;
	370
	371	#endif
	372	}
	373
	374	uschar *
9e4dddbd	375	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	376	{
9d1c15ef JH	377	int ret;
9e4dddbd JH	378	size_t siz;
	379	uschar sep = '\n';
	380	int index;
	381	uschar * list = NULL;
	382	uschar * ele;
	383
	384	if (mod)
	385	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef	386
9e4dddbd	387	for(index = 0;; index++)
9d1c15ef	388	{
9e4dddbd JH	389	siz = 0;
	390	switch(ret = gnutls_x509_crt_get_crl_dist_points(
	391	(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
	392	{
	393	case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
	394	return list;
	395	case GNUTLS_E_SHORT_MEMORY_BUFFER:
	396	break;
	397	default:
8a6eec04	398	return g_err("gc0", __FUNCTION__, ret);
9e4dddbd JH	399	}
	400
	401	ele = store_get(siz+1);
	402	if ((ret = gnutls_x509_crt_get_crl_dist_points(
8a6eec04 JH	403	(gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
	404	return g_err("gc1", __FUNCTION__, ret);
	405
9e4dddbd JH	406	ele[siz] = '\0';
9e4dddbd JH	407	list = string_append_listele(list, sep, ele);
9d1c15ef	408	}
9e4dddbd	409	/NOTREACHED/
9d1c15ef JH	410	}
	411
	412
6a8a60e0 JH	413	/*****************************************************
	414	* Certificate operator routines
	415	*****************************************************/
	416	static uschar *
	417	fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
	418	{
	419	int ret;
	420	size_t siz = 0;
	421	uschar * cp;
	422	uschar * cp2;
	423	uschar * cp3;
	424
	425	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
	426	!= GNUTLS_E_SHORT_MEMORY_BUFFER)
8a6eec04 JH	427	return g_err("gf0", __FUNCTION__, ret);
8a6eec04 JH	428
6a8a60e0 JH	429	cp = store_get(siz*3+1);
6a8a60e0 JH	430	if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
8a6eec04 JH	431	return g_err("gf1", __FUNCTION__, ret);
8a6eec04 JH	432
6a8a60e0 JH	433	for (cp3 = cp2 = cp+siz; cp < cp2; cp++, cp3+=2)
	434	sprintf(cp3, "%02X",*cp);
	435	return cp2;
	436	}
	437
	438
	439	uschar *
	440	tls_cert_fprt_md5(void * cert)
	441	{
	442	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_MD5);
	443	}
	444
	445	uschar *
	446	tls_cert_fprt_sha1(void * cert)
	447	{
	448	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA1);
	449	}
	450
9ef9101c JH	451	uschar *
	452	tls_cert_fprt_sha256(void * cert)
	453	{
	454	return fingerprint((gnutls_x509_crt_t)cert, GNUTLS_DIG_SHA256);
	455	}
	456
6a8a60e0	457
9d1c15ef JH	458	/* vi: aw ai sw=2
	459	*/
	460	/* End of tlscert-gnu.c */