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

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

/* Copyright (c) Jeremy Harris 2014 - 2016 */

/* 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>

#if OPENSSL_VERSION_NUMBER >= 0x10100000L
# define EXIM_HAVE_ASN1_MACROS
#endif


/*****************************************************
*  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 * x = *(X509 **)cert;
if (x)
  {
  X509_free(x);
  *cert = NULL;
  }
}


/*****************************************************
*  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, CSS &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 = TRUE;
  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 (!len || !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();

#ifdef EXIM_HAVE_ASN1_MACROS
ASN1_STRING_print(bp, adata);
#else
M_ASN1_OCTET_STRING_print(bp, adata);
#endif

/* 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
*****************************************************/
uschar *
tls_cert_der_b64(void * cert)
{
BIO * bp = BIO_new(BIO_s_mem());
uschar * cp = NULL;

if (!i2d_X509_bio(bp, (X509 *)cert))
  log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
    ERR_error_string(ERR_get_error(), NULL));
else
  {
  long len = BIO_get_mem_data(bp, &cp);
  cp = b64encode(cp, (int)len);
  }

BIO_free(bp);
return cp;
}


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
2813c06e	5	/* Copyright (c) Jeremy Harris 2014 - 2016 */
420a0d19 CE	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
2813c06e CE	20	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	21	# define EXIM_HAVE_ASN1_MACROS
	22	#endif
	23
420a0d19 CE	24
	25	/*****************************************************
	26	* Export/import a certificate, binary/printable
	27	*****************************************************/
	28	int
	29	tls_export_cert(uschar * buf, size_t buflen, void * cert)
	30	{
	31	BIO * bp = BIO_new(BIO_s_mem());
	32	int fail;
	33
	34	if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
	35	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	36	ERR_error_string(ERR_get_error(), NULL));
	37	else
	38	{
	39	char * cp = CS buf;
	40	int n;
	41	buflen -= 2;
	42	for(;;)
	43	{
	44	if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
	45	cp += n+1;
	46	buflen -= n+1;
	47	cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
	48	} /* compat with string_printing() */
	49	*cp = '\0';
	50	}
	51
	52	BIO_free(bp);
	53	return fail;
	54	}
	55
	56	int
	57	tls_import_cert(const uschar * buf, void ** cert)
	58	{
	59	void * reset_point = store_get(0);
	60	const uschar * cp = string_unprinting(US buf);
	61	BIO * bp;
2813c06e	62	X509 * x = (X509 *)cert;
420a0d19 CE	63	int fail = 0;
420a0d19 CE	64
2813c06e CE	65	if (x) X509_free(x);
2813c06e CE	66
420a0d19 CE	67	bp = BIO_new_mem_buf(US cp, -1);
	68	if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
	69	{
	70	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
	71	ERR_error_string(ERR_get_error(), NULL));
	72	fail = 1;
	73	}
	74	else
	75	cert = (void )x;
	76	BIO_free(bp);
	77	store_reset(reset_point);
	78	return fail;
	79	}
	80
	81	void
2813c06e	82	tls_free_cert(void ** cert)
420a0d19	83	{
2813c06e CE	84	X509 * x = (X509 *)cert;
	85	if (x)
	86	{
	87	X509_free(x);
	88	*cert = NULL;
	89	}
420a0d19 CE	90	}
	91
	92
	93	/*****************************************************
	94	* Certificate field extraction routines
	95	*****************************************************/
	96
	97	/* First, some internal service functions */
	98
	99	static uschar *
	100	badalloc(void)
	101	{
	102	expand_string_message = US"allocation failure";
	103	return NULL;
	104	}
	105
	106	static uschar *
	107	bio_string_copy(BIO * bp, int len)
	108	{
	109	uschar * cp = US"";
	110	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
	111	cp = string_copyn(cp, len);
	112	BIO_free(bp);
	113	return cp;
	114	}
	115
	116	static uschar *
2813c06e	117	asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
420a0d19	118	{
2813c06e	119	uschar * s = NULL;
420a0d19 CE	120	BIO * bp = BIO_new(BIO_s_mem());
	121	int len;
	122
2813c06e CE	123	if (!bp)
	124	return badalloc();
	125	len = ASN1_TIME_print(bp, asntime);
	126	len = len > 0 ? (int) BIO_get_mem_data(bp, CSS &s) : 0;
420a0d19	127
2813c06e CE	128	if (mod && Ustrcmp(mod, "raw") == 0) /* native ASN */
	129	s = string_copyn(s, len);
	130	else
	131	{
	132	struct tm tm;
	133	struct tm * tm_p = &tm;
	134	BOOL mod_tz = TRUE;
	135	uschar * tz = to_tz(US"GMT0"); /* need to call strptime with baseline TZ */
	136
	137	/* Parse OpenSSL ASN1_TIME_print output. A shame there seems to
	138	be no other interface for the times.
	139	*/
	140
	141	/XXX %Z might be glibc-specific? Solaris has it, at least/
	142	/XXX should we switch to POSIX locale for this? /
	143	tm.tm_isdst = 0;
	144	if (!len \|\| !strptime(CCS s, "%b %e %T %Y %Z", &tm))
	145	expand_string_message = US"failed time conversion";
	146
	147	else
	148	{
	149	time_t t = mktime(&tm); /* make the tm self-consistent */
	150
	151	if (mod && Ustrcmp(mod, "int") == 0) /* seconds since epoch */
	152	s = string_sprintf("%u", t);
	153
	154	else
	155	{
	156	if (!timestamps_utc) /* decoded string in local TZ */
	157	{ /* shift to local TZ */
	158	restore_tz(tz);
	159	mod_tz = FALSE;
	160	tm_p = localtime(&t);
	161	}
	162	/* "utc" is default, and rfc5280 says cert times should be Zulu */
	163
	164	/* convert to string in our format */
	165	len = 32;
	166	s = store_get(len);
	167	strftime(CS s, (size_t)len, "%b %e %T %Y %z", tm_p);
	168	}
	169	}
	170
	171	if (mod_tz)
	172	restore_tz(tz);
	173	}
	174	BIO_free(bp);
	175	return s;
420a0d19 CE	176	}
	177
	178	static uschar *
	179	x509_name_copy(X509_NAME * name)
	180	{
	181	BIO * bp = BIO_new(BIO_s_mem());
	182	int len_good;
	183
	184	if (!bp) return badalloc();
	185
	186	len_good =
	187	X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
	188	? 1 : 0;
	189	return bio_string_copy(bp, len_good);
	190	}
	191
	192	/**/
	193	/* Now the extractors, called from expand.c
	194	Arguments:
	195	cert The certificate
	196	mod Optional modifiers for the operator
	197
	198	Return:
	199	Allocated string with extracted value
	200	*/
	201
	202	uschar *
	203	tls_cert_issuer(void * cert, uschar * mod)
	204	{
	205	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
	206	return mod ? tls_field_from_dn(cp, mod) : cp;
	207	}
	208
	209	uschar *
	210	tls_cert_not_before(void * cert, uschar * mod)
	211	{
	212	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
	213	}
	214
	215	uschar *
	216	tls_cert_not_after(void * cert, uschar * mod)
	217	{
	218	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
	219	}
	220
	221	uschar *
	222	tls_cert_serial_number(void * cert, uschar * mod)
	223	{
	224	uschar txt[256];
	225	BIO * bp = BIO_new(BIO_s_mem());
	226	int len;
	227
	228	if (!bp) return badalloc();
	229
	230	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
	231	if (len < sizeof(txt))
	232	BIO_read(bp, txt, len);
	233	else
	234	len = 0;
	235	BIO_free(bp);
	236	return string_copynlc(txt, len); /* lowercase */
	237	}
	238
	239	uschar *
240	tls_cert_signature(void * cert, uschar * mod)
241	{
242	uschar * cp = NULL;
243	BIO * bp = BIO_new(BIO_s_mem());
244
245	if (!bp) return badalloc();
246
247	if (X509_print_ex(bp, (X509 *)cert, 0,
2813c06e CE	248	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
	249	X509_FLAG_NO_SIGNAME \| X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
	250	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
420a0d19 CE	251	/* X509_FLAG_NO_SIGDUMP is the missing one */
	252	X509_FLAG_NO_AUX) == 1)
	253	{
	254	long len = BIO_get_mem_data(bp, &cp);
	255
	256	/* Strip leading "Signature Algorithm" line */
	257	while (cp && cp != '\n') { cp++; len--; }
	258
	259	cp = string_copyn(cp+1, len-1);
	260	}
	261	BIO_free(bp);
	262	return cp;
	263	}
	264
	265	uschar *
	266	tls_cert_signature_algorithm(void * cert, uschar * mod)
	267	{
	268	uschar * cp = NULL;
	269	BIO * bp = BIO_new(BIO_s_mem());
	270
	271	if (!bp) return badalloc();
	272
	273	if (X509_print_ex(bp, (X509 *)cert, 0,
2813c06e	274	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
420a0d19	275	/* X509_FLAG_NO_SIGNAME is the missing one */
2813c06e CE	276	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
2813c06e CE	277	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
420a0d19 CE	278	X509_FLAG_NO_SIGDUMP \| X509_FLAG_NO_AUX) == 1)
	279	{
	280	long len = BIO_get_mem_data(bp, &cp);
	281
	282	/* Strip leading " Signature Algorithm: " and trailing newline */
	283	while (cp && cp != ':') { cp++; len--; }
	284	do { cp++; len--; } while (cp && cp == ' ');
	285	if (cp[len-1] == '\n') len--;
	286
	287	cp = string_copyn(cp, len);
	288	}
	289	BIO_free(bp);
	290	return cp;
	291	}
	292
	293	uschar *
	294	tls_cert_subject(void * cert, uschar * mod)
	295	{
	296	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
	297	return mod ? tls_field_from_dn(cp, mod) : cp;
	298	}
	299
	300	uschar *
	301	tls_cert_version(void * cert, uschar * mod)
	302	{
	303	return string_sprintf("%d", X509_get_version((X509 *)cert));
	304	}
	305
	306	uschar *
	307	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	308	{
	309	int nid = OBJ_create(CS oid, "", "");
	310	int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
	311	X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
	312	ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
	313	BIO * bp = BIO_new(BIO_s_mem());
	314	long len;
	315	uschar * cp1;
	316	uschar * cp2;
	317	uschar * cp3;
	318
	319	if (!bp) return badalloc();
	320
2813c06e CE	321	#ifdef EXIM_HAVE_ASN1_MACROS
	322	ASN1_STRING_print(bp, adata);
	323	#else
420a0d19	324	M_ASN1_OCTET_STRING_print(bp, adata);
2813c06e	325	#endif
420a0d19	326
2813c06e	327	/* binary data, DER encoded */
420a0d19 CE	328	/* just dump for now */
	329	len = BIO_get_mem_data(bp, &cp1);
	330	cp3 = cp2 = store_get(len*3+1);
	331
	332	while(len)
	333	{
	334	sprintf(CS cp2, "%.2x ", *cp1++);
	335	cp2 += 3;
	336	len--;
	337	}
	338	cp2[-1] = '\0';
	339
	340	return cp3;
	341	}
	342
	343	uschar *
	344	tls_cert_subject_altname(void * cert, uschar * mod)
	345	{
	346	uschar * list = NULL;
	347	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
	348	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
2813c06e	349	uschar osep = '\n';
420a0d19 CE	350	uschar * tag = US"";
	351	uschar * ele;
	352	int match = -1;
	353	int len;
	354
	355	if (!san) return NULL;
	356
2813c06e	357	while (mod && *mod)
420a0d19	358	{
2813c06e CE	359	if (mod == '>' && ++mod) osep = *mod++;
	360	else if (Ustrncmp(mod,"dns",3)==0) { match = GEN_DNS; mod += 3; }
	361	else if (Ustrncmp(mod,"uri",3)==0) { match = GEN_URI; mod += 3; }
	362	else if (Ustrncmp(mod,"mail",4)==0) { match = GEN_EMAIL; mod += 4; }
	363	else mod++;
420a0d19	364
2813c06e	365	if (*mod == ',') mod++;
420a0d19 CE	366	}
	367
	368	while (sk_GENERAL_NAME_num(san) > 0)
	369	{
	370	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
	371	if (match != -1 && match != namePart->type)
	372	continue;
	373	switch (namePart->type)
	374	{
	375	case GEN_DNS:
	376	tag = US"DNS";
	377	ele = ASN1_STRING_data(namePart->d.dNSName);
	378	len = ASN1_STRING_length(namePart->d.dNSName);
	379	break;
	380	case GEN_URI:
	381	tag = US"URI";
	382	ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
	383	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
	384	break;
	385	case GEN_EMAIL:
	386	tag = US"MAIL";
	387	ele = ASN1_STRING_data(namePart->d.rfc822Name);
	388	len = ASN1_STRING_length(namePart->d.rfc822Name);
	389	break;
	390	default:
	391	continue; /* ignore unrecognised types */
	392	}
	393	if (ele[len]) /* not nul-terminated */
	394	ele = string_copyn(ele, len);
	395
2813c06e CE	396	if (Ustrlen(ele) == len) /* ignore any with embedded nul */
2813c06e CE	397	list = string_append_listele(list, osep,
420a0d19 CE	398	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
	399	}
	400
	401	sk_GENERAL_NAME_free(san);
	402	return list;
	403	}
	404
	405	uschar *
	406	tls_cert_ocsp_uri(void * cert, uschar * mod)
	407	{
	408	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
	409	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
	410	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
	411	int i;
	412	uschar sep = '\n';
	413	uschar * list = NULL;
	414
	415	if (mod)
	416	if (mod == '>' && ++mod) sep = *mod++;
	417
	418	for (i = 0; i < adsnum; i++)
	419	{
	420	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	421
	422	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
2813c06e CE	423	{
	424	uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
	425	int len = ASN1_STRING_length(ad->location->d.ia5);
	426	list = string_append_listele_n(list, sep, ele, len);
	427	}
420a0d19	428	}
2813c06e	429	sk_ACCESS_DESCRIPTION_free(ads);
420a0d19 CE	430	return list;
	431	}
	432
	433	uschar *
	434	tls_cert_crl_uri(void * cert, uschar * mod)
	435	{
	436	STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
	437	X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
	438	NULL, NULL);
	439	DIST_POINT * dp;
	440	int dpsnum = sk_DIST_POINT_num(dps);
	441	int i;
	442	uschar sep = '\n';
	443	uschar * list = NULL;
	444
	445	if (mod)
	446	if (mod == '>' && ++mod) sep = *mod++;
	447
	448	if (dps) for (i = 0; i < dpsnum; i++)
	449	if ((dp = sk_DIST_POINT_value(dps, i)))
	450	{
	451	STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
	452	GENERAL_NAME * np;
	453	int nnum = sk_GENERAL_NAME_num(names);
	454	int j;
	455
	456	for (j = 0; j < nnum; j++)
	457	if ( (np = sk_GENERAL_NAME_value(names, j))
	458	&& np->type == GEN_URI
	459	)
2813c06e CE	460	{
	461	uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
	462	int len = ASN1_STRING_length(np->d.uniformResourceIdentifier);
	463	list = string_append_listele_n(list, sep, ele, len);
	464	}
420a0d19	465	}
2813c06e	466	sk_DIST_POINT_free(dps);
420a0d19 CE	467	return list;
	468	}
	469
	470
	471
	472	/*****************************************************
	473	* Certificate operator routines
	474	*****************************************************/
2813c06e CE	475	uschar *
	476	tls_cert_der_b64(void * cert)
	477	{
	478	BIO * bp = BIO_new(BIO_s_mem());
	479	uschar * cp = NULL;
	480
	481	if (!i2d_X509_bio(bp, (X509 *)cert))
	482	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	483	ERR_error_string(ERR_get_error(), NULL));
	484	else
	485	{
	486	long len = BIO_get_mem_data(bp, &cp);
	487	cp = b64encode(cp, (int)len);
	488	}
	489
	490	BIO_free(bp);
	491	return cp;
	492	}
	493
	494
420a0d19 CE	495	static uschar *
	496	fingerprint(X509 * cert, const EVP_MD * fdig)
	497	{
	498	int j;
	499	unsigned int n;
	500	uschar md[EVP_MAX_MD_SIZE];
	501	uschar * cp;
	502
	503	if (!X509_digest(cert,fdig,md,&n))
	504	{
	505	expand_string_message = US"tls_cert_fprt: out of mem\n";
	506	return NULL;
	507	}
	508	cp = store_get(n*2+1);
	509	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
	510	return(cp);
	511	}
	512
2813c06e	513	uschar *
420a0d19 CE	514	tls_cert_fprt_md5(void * cert)
	515	{
	516	return fingerprint((X509 *)cert, EVP_md5());
	517	}
	518
2813c06e	519	uschar *
420a0d19 CE	520	tls_cert_fprt_sha1(void * cert)
	521	{
	522	return fingerprint((X509 *)cert, EVP_sha1());
	523	}
	524
2813c06e	525	uschar *
420a0d19 CE	526	tls_cert_fprt_sha256(void * cert)
	527	{
	528	return fingerprint((X509 *)cert, EVP_sha256());
	529	}
	530
	531
	532	/* vi: aw ai sw=2
	533	*/
	534	/* End of tlscert-openssl.c */