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

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

/* Copyright (c) Jeremy Harris 2014 - 2017 */

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

return cp3;
}

uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
gstring * 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 string_from_gstring(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';
gstring * 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_n(list, sep,
      ASN1_STRING_data(ad->location->d.ia5),
      ASN1_STRING_length(ad->location->d.ia5));
  }
sk_ACCESS_DESCRIPTION_free(ads);
return string_from_gstring(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';
gstring * 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_n(list, sep,
	  ASN1_STRING_data(np->d.uniformResourceIdentifier),
	  ASN1_STRING_length(np->d.uniformResourceIdentifier));
    }
sk_DIST_POINT_free(dps);
return string_from_gstring(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
9d1c15ef JH	1	/*************************************************
	2	* Exim - an Internet mail transport agent *
	3	*************************************************/
	4
9242a7e8	5	/* Copyright (c) Jeremy Harris 2014 - 2017 */
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	19
c8dfb21d JH	20	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	21	# define EXIM_HAVE_ASN1_MACROS
	22	#endif
	23
9d1c15ef JH	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;
152e7604	62	X509 * x = (X509 *)cert;
c03fae8a	63	int fail = 0;
9d1c15ef	64
152e7604 JH	65	if (x) X509_free(x);
152e7604 JH	66
9d1c15ef	67	bp = BIO_new_mem_buf(US cp, -1);
c03fae8a JH	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));
9d1c15ef	72	fail = 1;
c03fae8a	73	}
9d1c15ef JH	74	else
	75	cert = (void )x;
	76	BIO_free(bp);
	77	store_reset(reset_point);
	78	return fail;
	79	}
	80
	81	void
790fbb71	82	tls_free_cert(void ** cert)
9d1c15ef	83	{
790fbb71 JH	84	X509 * x = (X509 *)cert;
	85	if (x)
	86	{
	87	X509_free(x);
	88	*cert = NULL;
	89	}
9d1c15ef JH	90	}
9d1c15ef JH	91
c03fae8a	92
9d1c15ef JH	93	/*****************************************************
	94	* Certificate field extraction routines
	95	*****************************************************/
c03fae8a JH	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
9d1c15ef JH	106	static uschar *
	107	bio_string_copy(BIO * bp, int len)
	108	{
e3dd1d67	109	uschar * cp = US"";
9d1c15ef JH	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 *
e9477a08	117	asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
9d1c15ef	118	{
e9477a08	119	uschar * s = NULL;
9d1c15ef	120	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	121	int len;
c03fae8a JH	122
e9477a08 JH	123	if (!bp)
	124	return badalloc();
	125	len = ASN1_TIME_print(bp, asntime);
d4ff61d1	126	len = len > 0 ? (int) BIO_get_mem_data(bp, CSS &s) : 0;
c03fae8a	127
e9477a08 JH	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;
755762fd	134	BOOL mod_tz = TRUE;
45500060	135	uschar * tz = to_tz(US"GMT0"); /* need to call strptime with baseline TZ */
e9477a08 JH	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;
d4ff61d1	144	if (!len \|\| !strptime(CCS s, "%b %e %T %Y %Z", &tm))
e9477a08 JH	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 */
bb07bcd3	152	s = string_sprintf(TIME_T_FMT, t);
e9477a08 JH	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
755762fd	171	if (mod_tz)
e9477a08 JH	172	restore_tz(tz);
	173	}
	174	BIO_free(bp);
	175	return s;
9d1c15ef JH	176	}
	177
	178	static uschar *
	179	x509_name_copy(X509_NAME * name)
	180	{
	181	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	182	int len_good;
	183
	184	if (!bp) return badalloc();
	185
	186	len_good =
9d1c15ef JH	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	/**/
c03fae8a JH	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	*/
9d1c15ef JH	201
9d1c15ef JH	202	uschar *
9e4dddbd	203	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	204	{
812a6045 JH	205	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
812a6045 JH	206	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	207	}
	208
	209	uschar *
9e4dddbd	210	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef	211	{
25ba2544	212	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
9d1c15ef JH	213	}
	214
	215	uschar *
9e4dddbd	216	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef	217	{
25ba2544	218	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
9d1c15ef JH	219	}
	220
	221	uschar *
9e4dddbd	222	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	223	{
	224	uschar txt[256];
	225	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a	226	int len;
9d1c15ef	227
c03fae8a JH	228	if (!bp) return badalloc();
	229
	230	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
9d1c15ef JH	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 *
9e4dddbd	240	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef	241	{
9d1c15ef	242	uschar * cp = NULL;
c03fae8a JH	243	BIO * bp = BIO_new(BIO_s_mem());
	244
	245	if (!bp) return badalloc();
9d1c15ef JH	246
9d1c15ef JH	247	if (X509_print_ex(bp, (X509 *)cert, 0,
94431adb HSHR	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 \|
9d1c15ef JH	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);
315e209a JH	255
	256	/* Strip leading "Signature Algorithm" line */
	257	while (cp && cp != '\n') { cp++; len--; }
	258
	259	cp = string_copyn(cp+1, len-1);
9d1c15ef JH	260	}
	261	BIO_free(bp);
	262	return cp;
	263	}
	264
	265	uschar *
9e4dddbd	266	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef	267	{
315e209a JH	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,
94431adb	274	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
315e209a	275	/* X509_FLAG_NO_SIGNAME is the missing one */
94431adb HSHR	276	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
94431adb HSHR	277	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
315e209a JH	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;
9d1c15ef JH	291	}
	292
	293	uschar *
9e4dddbd	294	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	295	{
812a6045 JH	296	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
812a6045 JH	297	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	298	}
	299
	300	uschar *
9e4dddbd	301	tls_cert_version(void * cert, uschar * mod)
9d1c15ef	302	{
bb07bcd3	303	return string_sprintf("%ld", X509_get_version((X509 *)cert));
9d1c15ef JH	304	}
	305
	306	uschar *
	307	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	308	{
e3dd1d67	309	int nid = OBJ_create(CS oid, "", "");
9d1c15ef JH	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
c03fae8a JH	319	if (!bp) return badalloc();
c03fae8a JH	320
c8dfb21d JH	321	#ifdef EXIM_HAVE_ASN1_MACROS
	322	ASN1_STRING_print(bp, adata);
	323	#else
9d1c15ef	324	M_ASN1_OCTET_STRING_print(bp, adata);
c8dfb21d	325	#endif
9d1c15ef	326
c8dfb21d	327	/* binary data, DER encoded */
9d1c15ef JH	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	{
5976eb99	334	cp2 += sprintf(CS cp2, "%.2x ", *cp1++);
9d1c15ef JH	335	len--;
	336	}
	337	cp2[-1] = '\0';
	338
	339	return cp3;
	340	}
	341
	342	uschar *
9e4dddbd	343	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	344	{
acec9514	345	gstring * list = NULL;
9d1c15ef JH	346	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
9d1c15ef JH	347	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
b3ef41c9	348	uschar osep = '\n';
9e4dddbd JH	349	uschar * tag = US"";
	350	uschar * ele;
	351	int match = -1;
e51c7be2	352	int len;
9d1c15ef JH	353
	354	if (!san) return NULL;
	355
b3ef41c9	356	while (mod && *mod)
9e4dddbd	357	{
b3ef41c9 JH	358	if (mod == '>' && ++mod) osep = *mod++;
	359	else if (Ustrncmp(mod,"dns",3)==0) { match = GEN_DNS; mod += 3; }
	360	else if (Ustrncmp(mod,"uri",3)==0) { match = GEN_URI; mod += 3; }
	361	else if (Ustrncmp(mod,"mail",4)==0) { match = GEN_EMAIL; mod += 4; }
	362	else mod++;
9e4dddbd	363
b3ef41c9	364	if (*mod == ',') mod++;
9e4dddbd JH	365	}
9e4dddbd JH	366
9d1c15ef JH	367	while (sk_GENERAL_NAME_num(san) > 0)
	368	{
	369	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
9e4dddbd JH	370	if (match != -1 && match != namePart->type)
9e4dddbd JH	371	continue;
9d1c15ef JH	372	switch (namePart->type)
9d1c15ef JH	373	{
9e4dddbd JH	374	case GEN_DNS:
	375	tag = US"DNS";
	376	ele = ASN1_STRING_data(namePart->d.dNSName);
e51c7be2	377	len = ASN1_STRING_length(namePart->d.dNSName);
9e4dddbd	378	break;
9d1c15ef	379	case GEN_URI:
9e4dddbd JH	380	tag = US"URI";
9e4dddbd JH	381	ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
e51c7be2	382	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
9e4dddbd	383	break;
9d1c15ef	384	case GEN_EMAIL:
9e4dddbd JH	385	tag = US"MAIL";
9e4dddbd JH	386	ele = ASN1_STRING_data(namePart->d.rfc822Name);
e51c7be2	387	len = ASN1_STRING_length(namePart->d.rfc822Name);
9e4dddbd	388	break;
9d1c15ef	389	default:
9e4dddbd	390	continue; /* ignore unrecognised types */
9d1c15ef	391	}
e51c7be2 JH	392	if (ele[len]) /* not nul-terminated */
	393	ele = string_copyn(ele, len);
	394
9acf6b94	395	if (Ustrlen(ele) == len) /* ignore any with embedded nul */
acec9514	396	list = string_append_listele(list, osep,
9e4dddbd	397	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef JH	398	}
9d1c15ef JH	399
9e4dddbd	400	sk_GENERAL_NAME_free(san);
acec9514	401	return string_from_gstring(list);
9d1c15ef JH	402	}
	403
	404	uschar *
9e4dddbd	405	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	406	{
	407	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
	408	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
	409	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
	410	int i;
9e4dddbd	411	uschar sep = '\n';
acec9514	412	gstring * list = NULL;
9e4dddbd JH	413
	414	if (mod)
	415	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	416
	417	for (i = 0; i < adsnum; i++)
	418	{
	419	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	420
	421	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
acec9514	422	list = string_append_listele_n(list, sep,
4226691b JH	423	ASN1_STRING_data(ad->location->d.ia5),
4226691b JH	424	ASN1_STRING_length(ad->location->d.ia5));
9d1c15ef	425	}
00ba27c5	426	sk_ACCESS_DESCRIPTION_free(ads);
acec9514	427	return string_from_gstring(list);
9d1c15ef JH	428	}
	429
	430	uschar *
9e4dddbd	431	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	432	{
	433	STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
	434	X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
	435	NULL, NULL);
	436	DIST_POINT * dp;
	437	int dpsnum = sk_DIST_POINT_num(dps);
	438	int i;
9e4dddbd	439	uschar sep = '\n';
acec9514	440	gstring * list = NULL;
9e4dddbd JH	441
	442	if (mod)
	443	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	444
	445	if (dps) for (i = 0; i < dpsnum; i++)
	446	if ((dp = sk_DIST_POINT_value(dps, i)))
	447	{
	448	STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
	449	GENERAL_NAME * np;
	450	int nnum = sk_GENERAL_NAME_num(names);
	451	int j;
	452
	453	for (j = 0; j < nnum; j++)
	454	if ( (np = sk_GENERAL_NAME_value(names, j))
	455	&& np->type == GEN_URI
	456	)
acec9514	457	list = string_append_listele_n(list, sep,
4226691b JH	458	ASN1_STRING_data(np->d.uniformResourceIdentifier),
4226691b JH	459	ASN1_STRING_length(np->d.uniformResourceIdentifier));
9d1c15ef	460	}
00ba27c5	461	sk_DIST_POINT_free(dps);
acec9514	462	return string_from_gstring(list);
9d1c15ef JH	463	}
9d1c15ef JH	464
6a8a60e0 JH	465
	466
	467	/*****************************************************
	468	* Certificate operator routines
	469	*****************************************************/
59b87190 JH	470	uschar *
	471	tls_cert_der_b64(void * cert)
	472	{
	473	BIO * bp = BIO_new(BIO_s_mem());
	474	uschar * cp = NULL;
	475
	476	if (!i2d_X509_bio(bp, (X509 *)cert))
	477	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	478	ERR_error_string(ERR_get_error(), NULL));
	479	else
	480	{
	481	long len = BIO_get_mem_data(bp, &cp);
	482	cp = b64encode(cp, (int)len);
	483	}
	484
	485	BIO_free(bp);
	486	return cp;
	487	}
	488
	489
6a8a60e0 JH	490	static uschar *
	491	fingerprint(X509 * cert, const EVP_MD * fdig)
	492	{
	493	int j;
	494	unsigned int n;
	495	uschar md[EVP_MAX_MD_SIZE];
	496	uschar * cp;
	497
	498	if (!X509_digest(cert,fdig,md,&n))
	499	{
	500	expand_string_message = US"tls_cert_fprt: out of mem\n";
	501	return NULL;
	502	}
	503	cp = store_get(n*2+1);
e3dd1d67	504	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
6a8a60e0 JH	505	return(cp);
	506	}
	507
94431adb	508	uschar *
6a8a60e0 JH	509	tls_cert_fprt_md5(void * cert)
	510	{
	511	return fingerprint((X509 *)cert, EVP_md5());
	512	}
	513
94431adb	514	uschar *
6a8a60e0 JH	515	tls_cert_fprt_sha1(void * cert)
	516	{
	517	return fingerprint((X509 *)cert, EVP_sha1());
	518	}
	519
94431adb	520	uschar *
9ef9101c JH	521	tls_cert_fprt_sha256(void * cert)
	522	{
	523	return fingerprint((X509 *)cert, EVP_sha256());
	524	}
	525
6a8a60e0	526
9d1c15ef JH	527	/* vi: aw ai sw=2
	528	*/
	529	/* End of tlscert-openssl.c */