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