[hcoop/debian/exim4.git] / src / tlscert-openssl.c

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

/* Copyright (c) Jeremy Harris 2014 */

/* This module provides TLS (aka SSL) support for Exim using the OpenSSL
library. It is #included into the tls.c file when that library is used.
*/


/* Heading stuff */

#include <openssl/lhash.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/x509v3.h>


/*****************************************************
*  Export/import a certificate, binary/printable
*****************************************************/
int
tls_export_cert(uschar * buf, size_t buflen, void * cert)
{
BIO * bp = BIO_new(BIO_s_mem());
int fail;

if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
  log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
    ERR_error_string(ERR_get_error(), NULL));
else
  {
  char * cp = CS buf;
  int n;
  buflen -= 2;
  for(;;)
    {
    if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
    cp += n+1;
    buflen -= n+1;
    cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
    }				 /* compat with string_printing() */
  *cp = '\0';
  }

BIO_free(bp);
return fail;
}

int
tls_import_cert(const uschar * buf, void ** cert)
{
void * reset_point = store_get(0);
const uschar * cp = string_unprinting(US buf);
BIO * bp;
X509 * x;
int fail = 0;

bp = BIO_new_mem_buf(US cp, -1);
if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
  {
  log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
    ERR_error_string(ERR_get_error(), NULL));
  fail = 1;
  }
else
  *cert = (void *)x;
BIO_free(bp);
store_reset(reset_point);
return fail;
}

void
tls_free_cert(void * cert)
{
X509_free((X509 *)cert);
}


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

/* First, some internal service functions */

static uschar *
badalloc(void)
{
expand_string_message = US"allocation failure";
return NULL;
}

static uschar *
bio_string_copy(BIO * bp, int len)
{
uschar * cp = US"";
len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
cp = string_copyn(cp, len);
BIO_free(bp);
return cp;
}

static uschar *
bio_string_time_to_int(BIO * bp, int len)
{
uschar * cp = US"";
struct tm t;
len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
/*XXX %Z might be glibc-specific? */
(void) strptime(CS cp, "%b%t%e%t%T%t%Y%t%Z", &t);
BIO_free(bp);
/*XXX timegm might not be portable? */
return string_sprintf("%u", (unsigned) timegm(&t));
}

static uschar *
asn1_time_copy(const ASN1_TIME * time, uschar * mod)
{
BIO * bp = BIO_new(BIO_s_mem());
int len;

if (!bp) return badalloc();

len = ASN1_TIME_print(bp, time);
return mod &&  Ustrcmp(mod, "int") == 0
  ? bio_string_time_to_int(bp, len)
  : bio_string_copy(bp, len);
}

static uschar *
x509_name_copy(X509_NAME * name)
{
BIO * bp = BIO_new(BIO_s_mem());
int len_good;

if (!bp) return badalloc();

len_good =
  X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
  ? 1 : 0;
return bio_string_copy(bp, len_good);
}

/**/
/* 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 = x509_name_copy(X509_get_issuer_name((X509 *)cert));
return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_not_before(void * cert, uschar * mod)
{
return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
}

uschar *
tls_cert_not_after(void * cert, uschar * mod)
{
return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
}

uschar *
tls_cert_serial_number(void * cert, uschar * mod)
{
uschar txt[256];
BIO * bp = BIO_new(BIO_s_mem());
int len;

if (!bp) return badalloc();

len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
if (len < sizeof(txt))
  BIO_read(bp, txt, len);
else
  len = 0;
BIO_free(bp);
return string_copynlc(txt, len);	/* lowercase */
}

uschar *
tls_cert_signature(void * cert, uschar * mod)
{
uschar * cp = NULL;
BIO * bp = BIO_new(BIO_s_mem());

if (!bp) return badalloc();

if (X509_print_ex(bp, (X509 *)cert, 0,
  X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL | 
  X509_FLAG_NO_SIGNAME | X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY | 
  X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS | 
  /* X509_FLAG_NO_SIGDUMP is the missing one */
  X509_FLAG_NO_AUX) == 1)
  {
  long len = BIO_get_mem_data(bp, &cp);

  /* Strip leading "Signature Algorithm" line */
  while (*cp && *cp != '\n') { cp++; len--; }

  cp = string_copyn(cp+1, len-1);
  }
BIO_free(bp);
return cp;
}

uschar *
tls_cert_signature_algorithm(void * cert, uschar * mod)
{
uschar * cp = NULL;
BIO * bp = BIO_new(BIO_s_mem());

if (!bp) return badalloc();

if (X509_print_ex(bp, (X509 *)cert, 0,
  X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL | 
  /* X509_FLAG_NO_SIGNAME is the missing one */
  X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY | 
  X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS | 
  X509_FLAG_NO_SIGDUMP | X509_FLAG_NO_AUX) == 1)
  {
  long len = BIO_get_mem_data(bp, &cp);

  /* Strip leading "    Signature Algorithm: " and trailing newline */
  while (*cp && *cp != ':') { cp++; len--; }
  do { cp++; len--; } while (*cp && *cp == ' ');
  if (cp[len-1] == '\n') len--;

  cp = string_copyn(cp, len);
  }
BIO_free(bp);
return cp;
}

uschar *
tls_cert_subject(void * cert, uschar * mod)
{
uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_version(void * cert, uschar * mod)
{
return string_sprintf("%d", X509_get_version((X509 *)cert));
}

uschar *
tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
{
int nid = OBJ_create(CS oid, "", "");
int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
BIO * bp = BIO_new(BIO_s_mem());
long len;
uschar * cp1;
uschar * cp2;
uschar * cp3;

if (!bp) return badalloc();

M_ASN1_OCTET_STRING_print(bp, adata);
/* binary data, DER encoded */

/* just dump for now */
len = BIO_get_mem_data(bp, &cp1);
cp3 = cp2 = store_get(len*3+1);

while(len)
  {
  sprintf(CS cp2, "%.2x ", *cp1++);
  cp2 += 3;
  len--;
  }
cp2[-1] = '\0';

return cp3;
}

uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
uschar * list = NULL;
STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
  X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
uschar sep = '\n';
uschar * tag = US"";
uschar * ele;
int match = -1;
int len;

if (!san) return NULL;

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

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

while (sk_GENERAL_NAME_num(san) > 0)
  {
  GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
  if (match != -1 && match != namePart->type)
    continue;
  switch (namePart->type)
    {
    case GEN_DNS:
      tag = US"DNS";
      ele = ASN1_STRING_data(namePart->d.dNSName);
      len = ASN1_STRING_length(namePart->d.dNSName);
      break;
    case GEN_URI:
      tag = US"URI";
      ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
      len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
      break;
    case GEN_EMAIL:
      tag = US"MAIL";
      ele = ASN1_STRING_data(namePart->d.rfc822Name);
      len = ASN1_STRING_length(namePart->d.rfc822Name);
      break;
    default:
      continue;	/* ignore unrecognised types */
    }
  if (ele[len])	/* not nul-terminated */
    ele = string_copyn(ele, len);

  if (strnlen(CS ele, len) == len)	/* ignore any with embedded nul */
    list = string_append_listele(list, sep,
	  match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
  }

sk_GENERAL_NAME_free(san);
return list;
}

uschar *
tls_cert_ocsp_uri(void * cert, uschar * mod)
{
STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
  X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
int i;
uschar sep = '\n';
uschar * list = NULL;

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

for (i = 0; i < adsnum; i++)
  {
  ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);

  if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
    list = string_append_listele(list, sep,
	      ASN1_STRING_data(ad->location->d.ia5));
  }
return list;
}

uschar *
tls_cert_crl_uri(void * cert, uschar * mod)
{
STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
  X509_get_ext_d2i((X509 *)cert,  NID_crl_distribution_points,
    NULL, NULL);
DIST_POINT * dp;
int dpsnum = sk_DIST_POINT_num(dps);
int i;
uschar sep = '\n';
uschar * list = NULL;

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

if (dps) for (i = 0; i < dpsnum; i++)
  if ((dp = sk_DIST_POINT_value(dps, i)))
    {
    STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
    GENERAL_NAME * np;
    int nnum = sk_GENERAL_NAME_num(names);
    int j;

    for (j = 0; j < nnum; j++)
      if (  (np = sk_GENERAL_NAME_value(names, j))
	 && np->type == GEN_URI
	 )
	list = string_append_listele(list, sep,
		ASN1_STRING_data(np->d.uniformResourceIdentifier));
    }
return list;
}


/*****************************************************
*  Certificate operator routines
*****************************************************/
static uschar *
fingerprint(X509 * cert, const EVP_MD * fdig)
{
int j;
unsigned int n;
uschar md[EVP_MAX_MD_SIZE];
uschar * cp;

if (!X509_digest(cert,fdig,md,&n))
  {
  expand_string_message = US"tls_cert_fprt: out of mem\n";
  return NULL;
  }
cp = store_get(n*2+1);
for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
return(cp);
}

uschar * 
tls_cert_fprt_md5(void * cert)
{
return fingerprint((X509 *)cert, EVP_md5());
}

uschar * 
tls_cert_fprt_sha1(void * cert)
{
return fingerprint((X509 *)cert, EVP_sha1());
}

uschar * 
tls_cert_fprt_sha256(void * cert)
{
return fingerprint((X509 *)cert, EVP_sha256());
}


/* vi: aw ai sw=2
*/
/* End of tlscert-openssl.c */
Commit	Line	Data
420a0d19 CE	1	/*************************************************
	2	* Exim - an Internet mail transport agent *
	3	*************************************************/
	4
	5	/* Copyright (c) Jeremy Harris 2014 */
	6
	7	/* This module provides TLS (aka SSL) support for Exim using the OpenSSL
	8	library. It is #included into the tls.c file when that library is used.
	9	*/
	10
	11
	12	/* Heading stuff */
	13
	14	#include <openssl/lhash.h>
	15	#include <openssl/ssl.h>
	16	#include <openssl/err.h>
	17	#include <openssl/rand.h>
	18	#include <openssl/x509v3.h>
	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	BIO * bp = BIO_new(BIO_s_mem());
	28	int fail;
	29
	30	if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
	31	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	32	ERR_error_string(ERR_get_error(), NULL));
	33	else
	34	{
	35	char * cp = CS buf;
	36	int n;
	37	buflen -= 2;
	38	for(;;)
	39	{
	40	if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
	41	cp += n+1;
	42	buflen -= n+1;
	43	cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
	44	} /* compat with string_printing() */
	45	*cp = '\0';
	46	}
	47
	48	BIO_free(bp);
	49	return fail;
	50	}
	51
	52	int
	53	tls_import_cert(const uschar * buf, void ** cert)
	54	{
	55	void * reset_point = store_get(0);
	56	const uschar * cp = string_unprinting(US buf);
	57	BIO * bp;
	58	X509 * x;
	59	int fail = 0;
	60
	61	bp = BIO_new_mem_buf(US cp, -1);
	62	if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
	63	{
	64	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
65	ERR_error_string(ERR_get_error(), NULL));
66	fail = 1;
67	}
68	else
69	cert = (void )x;
70	BIO_free(bp);
71	store_reset(reset_point);
72	return fail;
73	}
74
75	void
76	tls_free_cert(void * cert)
77	{
78	X509_free((X509 *)cert);
79	}
80
81
82	/*****************************************************
83	* Certificate field extraction routines
84	*****************************************************/
85
86	/* First, some internal service functions */
87
88	static uschar *
89	badalloc(void)
90	{
91	expand_string_message = US"allocation failure";
92	return NULL;
93	}
94
95	static uschar *
96	bio_string_copy(BIO * bp, int len)
97	{
98	uschar * cp = US"";
99	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
100	cp = string_copyn(cp, len);
101	BIO_free(bp);
102	return cp;
103	}
104
105	static uschar *
106	bio_string_time_to_int(BIO * bp, int len)
107	{
108	uschar * cp = US"";
109	struct tm t;
110	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
111	/XXX %Z might be glibc-specific? /
112	(void) strptime(CS cp, "%b%t%e%t%T%t%Y%t%Z", &t);
113	BIO_free(bp);
114	/XXX timegm might not be portable? /
115	return string_sprintf("%u", (unsigned) timegm(&t));
116	}
117
118	static uschar *
119	asn1_time_copy(const ASN1_TIME * time, uschar * mod)
120	{
121	BIO * bp = BIO_new(BIO_s_mem());
122	int len;
123
124	if (!bp) return badalloc();
125
126	len = ASN1_TIME_print(bp, time);
127	return mod && Ustrcmp(mod, "int") == 0
128	? bio_string_time_to_int(bp, len)
129	: bio_string_copy(bp, len);
130	}
131
132	static uschar *
133	x509_name_copy(X509_NAME * name)
134	{
135	BIO * bp = BIO_new(BIO_s_mem());
136	int len_good;
137
138	if (!bp) return badalloc();
139
140	len_good =
141	X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
142	? 1 : 0;
143	return bio_string_copy(bp, len_good);
144	}
145
146	/**/
147	/* Now the extractors, called from expand.c
148	Arguments:
149	cert The certificate
150	mod Optional modifiers for the operator
151
152	Return:
153	Allocated string with extracted value
154	*/
155
156	uschar *
157	tls_cert_issuer(void * cert, uschar * mod)
158	{
159	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
160	return mod ? tls_field_from_dn(cp, mod) : cp;
161	}
162
163	uschar *
164	tls_cert_not_before(void * cert, uschar * mod)
165	{
166	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
167	}
168
169	uschar *
170	tls_cert_not_after(void * cert, uschar * mod)
171	{
172	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
173	}
174
175	uschar *
176	tls_cert_serial_number(void * cert, uschar * mod)
177	{
178	uschar txt[256];
179	BIO * bp = BIO_new(BIO_s_mem());
180	int len;
181
182	if (!bp) return badalloc();
183
184	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
185	if (len < sizeof(txt))
186	BIO_read(bp, txt, len);
187	else
188	len = 0;
189	BIO_free(bp);
190	return string_copynlc(txt, len); /* lowercase */
191	}
192
193	uschar *
194	tls_cert_signature(void * cert, uschar * mod)
195	{
196	uschar * cp = NULL;
197	BIO * bp = BIO_new(BIO_s_mem());
198
199	if (!bp) return badalloc();
200
201	if (X509_print_ex(bp, (X509 *)cert, 0,
202	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
203	X509_FLAG_NO_SIGNAME \| X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
204	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
205	/* X509_FLAG_NO_SIGDUMP is the missing one */
206	X509_FLAG_NO_AUX) == 1)
207	{
208	long len = BIO_get_mem_data(bp, &cp);
209
210	/* Strip leading "Signature Algorithm" line */
211	while (cp && cp != '\n') { cp++; len--; }
212
213	cp = string_copyn(cp+1, len-1);
214	}
215	BIO_free(bp);
216	return cp;
217	}
218
219	uschar *
220	tls_cert_signature_algorithm(void * cert, uschar * mod)
221	{
222	uschar * cp = NULL;
223	BIO * bp = BIO_new(BIO_s_mem());
224
225	if (!bp) return badalloc();
226
227	if (X509_print_ex(bp, (X509 *)cert, 0,
228	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
229	/* X509_FLAG_NO_SIGNAME is the missing one */
230	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
231	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
232	X509_FLAG_NO_SIGDUMP \| X509_FLAG_NO_AUX) == 1)
233	{
234	long len = BIO_get_mem_data(bp, &cp);
235
236	/* Strip leading " Signature Algorithm: " and trailing newline */
237	while (cp && cp != ':') { cp++; len--; }
238	do { cp++; len--; } while (cp && cp == ' ');
239	if (cp[len-1] == '\n') len--;
240
241	cp = string_copyn(cp, len);
242	}
243	BIO_free(bp);
244	return cp;
245	}
246
247	uschar *
248	tls_cert_subject(void * cert, uschar * mod)
249	{
250	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
251	return mod ? tls_field_from_dn(cp, mod) : cp;
252	}
253
254	uschar *
255	tls_cert_version(void * cert, uschar * mod)
256	{
257	return string_sprintf("%d", X509_get_version((X509 *)cert));
258	}
259
260	uschar *
261	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
262	{
263	int nid = OBJ_create(CS oid, "", "");
264	int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
265	X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
266	ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
267	BIO * bp = BIO_new(BIO_s_mem());
268	long len;
269	uschar * cp1;
270	uschar * cp2;
271	uschar * cp3;
272
273	if (!bp) return badalloc();
274
275	M_ASN1_OCTET_STRING_print(bp, adata);
276	/* binary data, DER encoded */
277
278	/* just dump for now */
279	len = BIO_get_mem_data(bp, &cp1);
280	cp3 = cp2 = store_get(len*3+1);
281
282	while(len)
283	{
284	sprintf(CS cp2, "%.2x ", *cp1++);
285	cp2 += 3;
286	len--;
287	}
288	cp2[-1] = '\0';
289
290	return cp3;
291	}
292
293	uschar *
294	tls_cert_subject_altname(void * cert, uschar * mod)
295	{
296	uschar * list = NULL;
297	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
298	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
299	uschar sep = '\n';
300	uschar * tag = US"";
301	uschar * ele;
302	int match = -1;
303	int len;
304
305	if (!san) return NULL;
306
307	while (mod)
308	{
309	if (mod == '>' && ++mod) sep = *mod++;
310	else if (Ustrcmp(mod, "dns")==0) { match = GEN_DNS; mod += 3; }
311	else if (Ustrcmp(mod, "uri")==0) { match = GEN_URI; mod += 3; }
312	else if (Ustrcmp(mod, "mail")==0) { match = GEN_EMAIL; mod += 4; }
313	else continue;
314
315	if (*mod++ != ',')
316	break;
317	}
318
319	while (sk_GENERAL_NAME_num(san) > 0)
320	{
321	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
322	if (match != -1 && match != namePart->type)
323	continue;
324	switch (namePart->type)
325	{
326	case GEN_DNS:
327	tag = US"DNS";
328	ele = ASN1_STRING_data(namePart->d.dNSName);
329	len = ASN1_STRING_length(namePart->d.dNSName);
330	break;
331	case GEN_URI:
332	tag = US"URI";
333	ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
334	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
335	break;
336	case GEN_EMAIL:
337	tag = US"MAIL";
338	ele = ASN1_STRING_data(namePart->d.rfc822Name);
339	len = ASN1_STRING_length(namePart->d.rfc822Name);
340	break;
341	default:
342	continue; /* ignore unrecognised types */
343	}
344	if (ele[len]) /* not nul-terminated */
345	ele = string_copyn(ele, len);
346
347	if (strnlen(CS ele, len) == len) /* ignore any with embedded nul */
348	list = string_append_listele(list, sep,
349	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
350	}
351
352	sk_GENERAL_NAME_free(san);
353	return list;
354	}
355
356	uschar *
357	tls_cert_ocsp_uri(void * cert, uschar * mod)
358	{
359	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
360	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
361	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
362	int i;
363	uschar sep = '\n';
364	uschar * list = NULL;
365
366	if (mod)
367	if (mod == '>' && ++mod) sep = *mod++;
368
369	for (i = 0; i < adsnum; i++)
370	{
371	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
372
373	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
374	list = string_append_listele(list, sep,
375	ASN1_STRING_data(ad->location->d.ia5));
376	}
377	return list;
378	}
379
380	uschar *
381	tls_cert_crl_uri(void * cert, uschar * mod)
382	{
383	STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
384	X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
385	NULL, NULL);
386	DIST_POINT * dp;
387	int dpsnum = sk_DIST_POINT_num(dps);
388	int i;
389	uschar sep = '\n';
390	uschar * list = NULL;
391
392	if (mod)
393	if (mod == '>' && ++mod) sep = *mod++;
394
395	if (dps) for (i = 0; i < dpsnum; i++)
396	if ((dp = sk_DIST_POINT_value(dps, i)))
397	{
398	STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
399	GENERAL_NAME * np;
400	int nnum = sk_GENERAL_NAME_num(names);
401	int j;
402
403	for (j = 0; j < nnum; j++)
404	if ( (np = sk_GENERAL_NAME_value(names, j))
405	&& np->type == GEN_URI
406	)
407	list = string_append_listele(list, sep,
408	ASN1_STRING_data(np->d.uniformResourceIdentifier));
409	}
410	return list;
411	}
412
413
414
415	/*****************************************************
416	* Certificate operator routines
417	*****************************************************/
418	static uschar *
419	fingerprint(X509 * cert, const EVP_MD * fdig)
420	{
421	int j;
422	unsigned int n;
423	uschar md[EVP_MAX_MD_SIZE];
424	uschar * cp;
425
426	if (!X509_digest(cert,fdig,md,&n))
427	{
428	expand_string_message = US"tls_cert_fprt: out of mem\n";
429	return NULL;
430	}
431	cp = store_get(n*2+1);
432	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
433	return(cp);
434	}
435
436	uschar *
437	tls_cert_fprt_md5(void * cert)
438	{
439	return fingerprint((X509 *)cert, EVP_md5());
440	}
441
442	uschar *
443	tls_cert_fprt_sha1(void * cert)
444	{
445	return fingerprint((X509 *)cert, EVP_sha1());
446	}
447
448	uschar *
449	tls_cert_fprt_sha256(void * cert)
450	{
451	return fingerprint((X509 *)cert, EVP_sha256());
452	}
453
454
455	/* vi: aw ai sw=2
456	*/
457	/* End of tlscert-openssl.c */