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

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

/* Copyright (c) Jeremy Harris 2014 - 2015 */

/* 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 = *(X509 **)cert;
int fail = 0;

if (x) X509_free(x);

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 *
asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
{
uschar * s = NULL;
BIO * bp = BIO_new(BIO_s_mem());
int len;

if (!bp)
  return badalloc();
len = ASN1_TIME_print(bp, asntime);
len = len > 0 ? (int) BIO_get_mem_data(bp, &s) : 0;

if (mod && Ustrcmp(mod, "raw") == 0)		/* native ASN */
  s = string_copyn(s, len);
else
  {
  struct tm tm;
  struct tm * tm_p = &tm;
  BOOL mod_tz;
  uschar * tz = to_tz(US"GMT0");    /* need to call strptime with baseline TZ */

  /* Parse OpenSSL ASN1_TIME_print output.  A shame there seems to
  be no other interface for the times.
  */

  /*XXX %Z might be glibc-specific?  Solaris has it, at least*/
  /*XXX should we switch to POSIX locale for this? */
  tm.tm_isdst = 0;
  if (!strptime(CCS s, "%b %e %T %Y %Z", &tm))
    expand_string_message = US"failed time conversion";

  else
    {
    time_t t = mktime(&tm);	/* make the tm self-consistent */

    if (mod && Ustrcmp(mod, "int") == 0)	/* seconds since epoch */
      s = string_sprintf("%u", t);

    else
      {
      if (!timestamps_utc)	/* decoded string in local TZ */
	{				/* shift to local TZ */
	restore_tz(tz);
	mod_tz = FALSE;
	tm_p = localtime(&t);
	}
      /* "utc" is default, and rfc5280 says cert times should be Zulu */

      /* convert to string in our format */
      len = 32;
      s = store_get(len);
      strftime(CS s, (size_t)len, "%b %e %T %Y %z", tm_p);
      }
    }

  if (mod_tz);
    restore_tz(tz);
  }
BIO_free(bp);
return s;
}

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 osep = '\n';
uschar * tag = US"";
uschar * ele;
int match = -1;
int len;

if (!san) return NULL;

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

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

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 (Ustrlen(ele) == len)	/* ignore any with embedded nul */
    list = string_append_listele(list, osep,
	  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)
    {
    uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
    int len =  ASN1_STRING_length(ad->location->d.ia5);
    list = string_append_listele_n(list, sep, ele, len);
    }
  }
sk_ACCESS_DESCRIPTION_free(ads);
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
	 )
	{
	uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
	int len =  ASN1_STRING_length(np->d.uniformResourceIdentifier);
	list = string_append_listele_n(list, sep, ele, len);
	}
    }
sk_DIST_POINT_free(dps);
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
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 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>
51424d08	18	#include <openssl/x509v3.h>
9d1c15ef JH	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;
152e7604	58	X509 * x = (X509 *)cert;
c03fae8a	59	int fail = 0;
9d1c15ef	60
152e7604 JH	61	if (x) X509_free(x);
152e7604 JH	62
9d1c15ef	63	bp = BIO_new_mem_buf(US cp, -1);
c03fae8a JH	64	if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
	65	{
	66	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
	67	ERR_error_string(ERR_get_error(), NULL));
9d1c15ef	68	fail = 1;
c03fae8a	69	}
9d1c15ef JH	70	else
	71	cert = (void )x;
	72	BIO_free(bp);
	73	store_reset(reset_point);
	74	return fail;
	75	}
	76
	77	void
	78	tls_free_cert(void * cert)
	79	{
	80	X509_free((X509 *)cert);
	81	}
	82
c03fae8a	83
9d1c15ef JH	84	/*****************************************************
	85	* Certificate field extraction routines
	86	*****************************************************/
c03fae8a JH	87
	88	/* First, some internal service functions */
	89
	90	static uschar *
	91	badalloc(void)
	92	{
	93	expand_string_message = US"allocation failure";
	94	return NULL;
	95	}
	96
9d1c15ef JH	97	static uschar *
	98	bio_string_copy(BIO * bp, int len)
	99	{
e3dd1d67	100	uschar * cp = US"";
9d1c15ef JH	101	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
	102	cp = string_copyn(cp, len);
	103	BIO_free(bp);
	104	return cp;
	105	}
	106
	107	static uschar *
e9477a08	108	asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
9d1c15ef	109	{
e9477a08	110	uschar * s = NULL;
9d1c15ef	111	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	112	int len;
c03fae8a JH	113
e9477a08 JH	114	if (!bp)
	115	return badalloc();
	116	len = ASN1_TIME_print(bp, asntime);
	117	len = len > 0 ? (int) BIO_get_mem_data(bp, &s) : 0;
c03fae8a	118
e9477a08 JH	119	if (mod && Ustrcmp(mod, "raw") == 0) /* native ASN */
	120	s = string_copyn(s, len);
	121	else
	122	{
	123	struct tm tm;
	124	struct tm * tm_p = &tm;
	125	BOOL mod_tz;
45500060	126	uschar * tz = to_tz(US"GMT0"); /* need to call strptime with baseline TZ */
e9477a08 JH	127
	128	/* Parse OpenSSL ASN1_TIME_print output. A shame there seems to
	129	be no other interface for the times.
	130	*/
	131
	132	/XXX %Z might be glibc-specific? Solaris has it, at least/
	133	/XXX should we switch to POSIX locale for this? /
	134	tm.tm_isdst = 0;
	135	if (!strptime(CCS s, "%b %e %T %Y %Z", &tm))
	136	expand_string_message = US"failed time conversion";
	137
	138	else
	139	{
	140	time_t t = mktime(&tm); /* make the tm self-consistent */
	141
	142	if (mod && Ustrcmp(mod, "int") == 0) /* seconds since epoch */
	143	s = string_sprintf("%u", t);
	144
	145	else
	146	{
	147	if (!timestamps_utc) /* decoded string in local TZ */
	148	{ /* shift to local TZ */
	149	restore_tz(tz);
	150	mod_tz = FALSE;
	151	tm_p = localtime(&t);
	152	}
	153	/* "utc" is default, and rfc5280 says cert times should be Zulu */
	154
	155	/* convert to string in our format */
	156	len = 32;
	157	s = store_get(len);
	158	strftime(CS s, (size_t)len, "%b %e %T %Y %z", tm_p);
	159	}
	160	}
	161
	162	if (mod_tz);
	163	restore_tz(tz);
	164	}
	165	BIO_free(bp);
	166	return s;
9d1c15ef JH	167	}
	168
	169	static uschar *
	170	x509_name_copy(X509_NAME * name)
	171	{
	172	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	173	int len_good;
	174
	175	if (!bp) return badalloc();
	176
	177	len_good =
9d1c15ef JH	178	X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
	179	? 1 : 0;
	180	return bio_string_copy(bp, len_good);
	181	}
	182
	183	/**/
c03fae8a JH	184	/* Now the extractors, called from expand.c
	185	Arguments:
	186	cert The certificate
	187	mod Optional modifiers for the operator
	188
	189	Return:
	190	Allocated string with extracted value
	191	*/
9d1c15ef JH	192
9d1c15ef JH	193	uschar *
9e4dddbd	194	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	195	{
812a6045 JH	196	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
812a6045 JH	197	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	198	}
	199
	200	uschar *
9e4dddbd	201	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef	202	{
25ba2544	203	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
9d1c15ef JH	204	}
	205
	206	uschar *
9e4dddbd	207	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef	208	{
25ba2544	209	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
9d1c15ef JH	210	}
	211
	212	uschar *
9e4dddbd	213	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	214	{
	215	uschar txt[256];
	216	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a	217	int len;
9d1c15ef	218
c03fae8a JH	219	if (!bp) return badalloc();
	220
	221	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
9d1c15ef JH	222	if (len < sizeof(txt))
	223	BIO_read(bp, txt, len);
	224	else
	225	len = 0;
	226	BIO_free(bp);
	227	return string_copynlc(txt, len); /* lowercase */
	228	}
	229
	230	uschar *
9e4dddbd	231	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef	232	{
9d1c15ef	233	uschar * cp = NULL;
c03fae8a JH	234	BIO * bp = BIO_new(BIO_s_mem());
	235
	236	if (!bp) return badalloc();
9d1c15ef JH	237
	238	if (X509_print_ex(bp, (X509 *)cert, 0,
	239	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
	240	X509_FLAG_NO_SIGNAME \| X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
	241	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
	242	/* X509_FLAG_NO_SIGDUMP is the missing one */
	243	X509_FLAG_NO_AUX) == 1)
	244	{
	245	long len = BIO_get_mem_data(bp, &cp);
315e209a JH	246
	247	/* Strip leading "Signature Algorithm" line */
	248	while (cp && cp != '\n') { cp++; len--; }
	249
	250	cp = string_copyn(cp+1, len-1);
9d1c15ef JH	251	}
	252	BIO_free(bp);
	253	return cp;
	254	}
	255
	256	uschar *
9e4dddbd	257	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef	258	{
315e209a JH	259	uschar * cp = NULL;
	260	BIO * bp = BIO_new(BIO_s_mem());
	261
	262	if (!bp) return badalloc();
	263
	264	if (X509_print_ex(bp, (X509 *)cert, 0,
	265	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
	266	/* X509_FLAG_NO_SIGNAME is the missing one */
	267	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
	268	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
	269	X509_FLAG_NO_SIGDUMP \| X509_FLAG_NO_AUX) == 1)
	270	{
	271	long len = BIO_get_mem_data(bp, &cp);
	272
	273	/* Strip leading " Signature Algorithm: " and trailing newline */
	274	while (cp && cp != ':') { cp++; len--; }
	275	do { cp++; len--; } while (cp && cp == ' ');
	276	if (cp[len-1] == '\n') len--;
	277
	278	cp = string_copyn(cp, len);
	279	}
	280	BIO_free(bp);
	281	return cp;
9d1c15ef JH	282	}
	283
	284	uschar *
9e4dddbd	285	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	286	{
812a6045 JH	287	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
812a6045 JH	288	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	289	}
	290
	291	uschar *
9e4dddbd	292	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	293	{
	294	return string_sprintf("%d", X509_get_version((X509 *)cert));
	295	}
	296
	297	uschar *
	298	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	299	{
e3dd1d67	300	int nid = OBJ_create(CS oid, "", "");
9d1c15ef JH	301	int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
	302	X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
	303	ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
	304	BIO * bp = BIO_new(BIO_s_mem());
	305	long len;
	306	uschar * cp1;
	307	uschar * cp2;
	308	uschar * cp3;
	309
c03fae8a JH	310	if (!bp) return badalloc();
c03fae8a JH	311
9d1c15ef JH	312	M_ASN1_OCTET_STRING_print(bp, adata);
	313	/* binary data, DER encoded */
	314
	315	/* just dump for now */
	316	len = BIO_get_mem_data(bp, &cp1);
	317	cp3 = cp2 = store_get(len*3+1);
	318
	319	while(len)
	320	{
e3dd1d67	321	sprintf(CS cp2, "%.2x ", *cp1++);
9d1c15ef JH	322	cp2 += 3;
	323	len--;
	324	}
	325	cp2[-1] = '\0';
	326
	327	return cp3;
	328	}
	329
	330	uschar *
9e4dddbd	331	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	332	{
9e4dddbd	333	uschar * list = NULL;
9d1c15ef JH	334	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
9d1c15ef JH	335	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
b3ef41c9	336	uschar osep = '\n';
9e4dddbd JH	337	uschar * tag = US"";
	338	uschar * ele;
	339	int match = -1;
e51c7be2	340	int len;
9d1c15ef JH	341
	342	if (!san) return NULL;
	343
b3ef41c9	344	while (mod && *mod)
9e4dddbd	345	{
b3ef41c9 JH	346	if (mod == '>' && ++mod) osep = *mod++;
	347	else if (Ustrncmp(mod,"dns",3)==0) { match = GEN_DNS; mod += 3; }
	348	else if (Ustrncmp(mod,"uri",3)==0) { match = GEN_URI; mod += 3; }
	349	else if (Ustrncmp(mod,"mail",4)==0) { match = GEN_EMAIL; mod += 4; }
	350	else mod++;
9e4dddbd	351
b3ef41c9	352	if (*mod == ',') mod++;
9e4dddbd JH	353	}
9e4dddbd JH	354
9d1c15ef JH	355	while (sk_GENERAL_NAME_num(san) > 0)
	356	{
	357	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
9e4dddbd JH	358	if (match != -1 && match != namePart->type)
9e4dddbd JH	359	continue;
9d1c15ef JH	360	switch (namePart->type)
9d1c15ef JH	361	{
9e4dddbd JH	362	case GEN_DNS:
	363	tag = US"DNS";
	364	ele = ASN1_STRING_data(namePart->d.dNSName);
e51c7be2	365	len = ASN1_STRING_length(namePart->d.dNSName);
9e4dddbd	366	break;
9d1c15ef	367	case GEN_URI:
9e4dddbd JH	368	tag = US"URI";
9e4dddbd JH	369	ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
e51c7be2	370	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
9e4dddbd	371	break;
9d1c15ef	372	case GEN_EMAIL:
9e4dddbd JH	373	tag = US"MAIL";
9e4dddbd JH	374	ele = ASN1_STRING_data(namePart->d.rfc822Name);
e51c7be2	375	len = ASN1_STRING_length(namePart->d.rfc822Name);
9e4dddbd	376	break;
9d1c15ef	377	default:
9e4dddbd	378	continue; /* ignore unrecognised types */
9d1c15ef	379	}
e51c7be2 JH	380	if (ele[len]) /* not nul-terminated */
	381	ele = string_copyn(ele, len);
	382
9acf6b94	383	if (Ustrlen(ele) == len) /* ignore any with embedded nul */
b3ef41c9	384	list = string_append_listele(list, osep,
9e4dddbd	385	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef JH	386	}
9d1c15ef JH	387
9e4dddbd JH	388	sk_GENERAL_NAME_free(san);
9e4dddbd JH	389	return list;
9d1c15ef JH	390	}
	391
	392	uschar *
9e4dddbd	393	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	394	{
	395	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
	396	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
	397	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
	398	int i;
9e4dddbd JH	399	uschar sep = '\n';
	400	uschar * list = NULL;
	401
	402	if (mod)
	403	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	404
	405	for (i = 0; i < adsnum; i++)
	406	{
	407	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	408
	409	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
00ba27c5 JH	410	{
	411	uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
	412	int len = ASN1_STRING_length(ad->location->d.ia5);
	413	list = string_append_listele_n(list, sep, ele, len);
	414	}
9d1c15ef	415	}
00ba27c5	416	sk_ACCESS_DESCRIPTION_free(ads);
9e4dddbd	417	return list;
9d1c15ef JH	418	}
	419
	420	uschar *
9e4dddbd	421	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	422	{
	423	STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
	424	X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
	425	NULL, NULL);
	426	DIST_POINT * dp;
	427	int dpsnum = sk_DIST_POINT_num(dps);
	428	int i;
9e4dddbd JH	429	uschar sep = '\n';
	430	uschar * list = NULL;
	431
	432	if (mod)
	433	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	434
	435	if (dps) for (i = 0; i < dpsnum; i++)
	436	if ((dp = sk_DIST_POINT_value(dps, i)))
	437	{
	438	STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
	439	GENERAL_NAME * np;
	440	int nnum = sk_GENERAL_NAME_num(names);
	441	int j;
	442
	443	for (j = 0; j < nnum; j++)
	444	if ( (np = sk_GENERAL_NAME_value(names, j))
	445	&& np->type == GEN_URI
	446	)
00ba27c5 JH	447	{
	448	uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
	449	int len = ASN1_STRING_length(np->d.uniformResourceIdentifier);
	450	list = string_append_listele_n(list, sep, ele, len);
	451	}
9d1c15ef	452	}
00ba27c5	453	sk_DIST_POINT_free(dps);
9e4dddbd	454	return list;
9d1c15ef JH	455	}
9d1c15ef JH	456
6a8a60e0 JH	457
	458
	459	/*****************************************************
	460	* Certificate operator routines
	461	*****************************************************/
	462	static uschar *
	463	fingerprint(X509 * cert, const EVP_MD * fdig)
	464	{
	465	int j;
	466	unsigned int n;
	467	uschar md[EVP_MAX_MD_SIZE];
	468	uschar * cp;
	469
	470	if (!X509_digest(cert,fdig,md,&n))
	471	{
	472	expand_string_message = US"tls_cert_fprt: out of mem\n";
	473	return NULL;
	474	}
	475	cp = store_get(n*2+1);
e3dd1d67	476	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
6a8a60e0 JH	477	return(cp);
	478	}
	479
	480	uschar *
	481	tls_cert_fprt_md5(void * cert)
	482	{
	483	return fingerprint((X509 *)cert, EVP_md5());
	484	}
	485
	486	uschar *
	487	tls_cert_fprt_sha1(void * cert)
	488	{
	489	return fingerprint((X509 *)cert, EVP_sha1());
	490	}
	491
9ef9101c JH	492	uschar *
	493	tls_cert_fprt_sha256(void * cert)
	494	{
	495	return fingerprint((X509 *)cert, EVP_sha256());
	496	}
	497
6a8a60e0	498
9d1c15ef JH	499	/* vi: aw ai sw=2
	500	*/
	501	/* End of tlscert-openssl.c */