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

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

/* Copyright (c) Jeremy Harris 2014 - 2018 */

/* 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

#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
# define ASN1_STRING_get0_data ASN1_STRING_data
#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 (!f.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 = US ASN1_STRING_get0_data(namePart->d.dNSName);
      len = ASN1_STRING_length(namePart->d.dNSName);
      break;
    case GEN_URI:
      tag = US"URI";
      ele = US ASN1_STRING_get0_data(namePart->d.uniformResourceIdentifier);
      len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
      break;
    case GEN_EMAIL:
      tag = US"MAIL";
      ele = US ASN1_STRING_get0_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,
      US ASN1_STRING_get0_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,
	  US ASN1_STRING_get0_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
420a0d19 CE	1	/*************************************************
	2	* Exim - an Internet mail transport agent *
	3	*************************************************/
	4
2ea97746	5	/* Copyright (c) Jeremy Harris 2014 - 2018 */
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
2ea97746 CE	20	#if OPENSSL_VERSION_NUMBER >= 0x10100000L
	21	# define EXIM_HAVE_ASN1_MACROS
	22	#endif
	23
	24	#if OPENSSL_VERSION_NUMBER < 0x10100000L \|\| defined(LIBRESSL_VERSION_NUMBER)
	25	# define ASN1_STRING_get0_data ASN1_STRING_data
	26	#endif
420a0d19 CE	27
	28	/*****************************************************
	29	* Export/import a certificate, binary/printable
	30	*****************************************************/
	31	int
	32	tls_export_cert(uschar * buf, size_t buflen, void * cert)
	33	{
	34	BIO * bp = BIO_new(BIO_s_mem());
	35	int fail;
	36
	37	if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
	38	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	39	ERR_error_string(ERR_get_error(), NULL));
	40	else
	41	{
	42	char * cp = CS buf;
	43	int n;
	44	buflen -= 2;
	45	for(;;)
	46	{
	47	if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
	48	cp += n+1;
	49	buflen -= n+1;
	50	cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
	51	} /* compat with string_printing() */
	52	*cp = '\0';
	53	}
	54
	55	BIO_free(bp);
	56	return fail;
	57	}
	58
	59	int
	60	tls_import_cert(const uschar * buf, void ** cert)
	61	{
	62	void * reset_point = store_get(0);
	63	const uschar * cp = string_unprinting(US buf);
	64	BIO * bp;
2ea97746	65	X509 * x = (X509 *)cert;
420a0d19 CE	66	int fail = 0;
420a0d19 CE	67
2ea97746 CE	68	if (x) X509_free(x);
2ea97746 CE	69
420a0d19 CE	70	bp = BIO_new_mem_buf(US cp, -1);
	71	if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
	72	{
	73	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
	74	ERR_error_string(ERR_get_error(), NULL));
	75	fail = 1;
	76	}
	77	else
	78	cert = (void )x;
	79	BIO_free(bp);
	80	store_reset(reset_point);
	81	return fail;
	82	}
	83
	84	void
2ea97746	85	tls_free_cert(void ** cert)
420a0d19	86	{
2ea97746 CE	87	X509 * x = (X509 *)cert;
	88	if (x)
	89	{
	90	X509_free(x);
	91	*cert = NULL;
	92	}
420a0d19 CE	93	}
	94
	95
	96	/*****************************************************
	97	* Certificate field extraction routines
	98	*****************************************************/
	99
	100	/* First, some internal service functions */
	101
	102	static uschar *
	103	badalloc(void)
	104	{
	105	expand_string_message = US"allocation failure";
	106	return NULL;
	107	}
	108
	109	static uschar *
	110	bio_string_copy(BIO * bp, int len)
	111	{
	112	uschar * cp = US"";
	113	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
	114	cp = string_copyn(cp, len);
	115	BIO_free(bp);
	116	return cp;
	117	}
	118
	119	static uschar *
2ea97746	120	asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
420a0d19	121	{
2ea97746	122	uschar * s = NULL;
420a0d19 CE	123	BIO * bp = BIO_new(BIO_s_mem());
	124	int len;
	125
2ea97746 CE	126	if (!bp)
	127	return badalloc();
	128	len = ASN1_TIME_print(bp, asntime);
	129	len = len > 0 ? (int) BIO_get_mem_data(bp, CSS &s) : 0;
	130
	131	if (mod && Ustrcmp(mod, "raw") == 0) /* native ASN */
	132	s = string_copyn(s, len);
	133	else
	134	{
	135	struct tm tm;
	136	struct tm * tm_p = &tm;
	137	BOOL mod_tz = TRUE;
	138	uschar * tz = to_tz(US"GMT0"); /* need to call strptime with baseline TZ */
	139
	140	/* Parse OpenSSL ASN1_TIME_print output. A shame there seems to
	141	be no other interface for the times.
	142	*/
	143
	144	/XXX %Z might be glibc-specific? Solaris has it, at least/
	145	/XXX should we switch to POSIX locale for this? /
	146	tm.tm_isdst = 0;
	147	if (!len \|\| !strptime(CCS s, "%b %e %T %Y %Z", &tm))
	148	expand_string_message = US"failed time conversion";
	149
	150	else
	151	{
	152	time_t t = mktime(&tm); /* make the tm self-consistent */
	153
	154	if (mod && Ustrcmp(mod, "int") == 0) /* seconds since epoch */
	155	s = string_sprintf(TIME_T_FMT, t);
	156
	157	else
	158	{
	159	if (!f.timestamps_utc) /* decoded string in local TZ */
	160	{ /* shift to local TZ */
	161	restore_tz(tz);
	162	mod_tz = FALSE;
	163	tm_p = localtime(&t);
	164	}
	165	/* "utc" is default, and rfc5280 says cert times should be Zulu */
	166
	167	/* convert to string in our format */
	168	len = 32;
	169	s = store_get(len);
	170	strftime(CS s, (size_t)len, "%b %e %T %Y %z", tm_p);
	171	}
	172	}
420a0d19	173
2ea97746 CE	174	if (mod_tz)
	175	restore_tz(tz);
	176	}
	177	BIO_free(bp);
	178	return s;
420a0d19 CE	179	}
	180
	181	static uschar *
	182	x509_name_copy(X509_NAME * name)
	183	{
	184	BIO * bp = BIO_new(BIO_s_mem());
	185	int len_good;
	186
	187	if (!bp) return badalloc();
	188
	189	len_good =
	190	X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
	191	? 1 : 0;
	192	return bio_string_copy(bp, len_good);
	193	}
	194
	195	/**/
	196	/* Now the extractors, called from expand.c
	197	Arguments:
	198	cert The certificate
	199	mod Optional modifiers for the operator
	200
	201	Return:
	202	Allocated string with extracted value
	203	*/
	204
	205	uschar *
	206	tls_cert_issuer(void * cert, uschar * mod)
	207	{
	208	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
	209	return mod ? tls_field_from_dn(cp, mod) : cp;
	210	}
	211
	212	uschar *
	213	tls_cert_not_before(void * cert, uschar * mod)
	214	{
	215	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
	216	}
	217
	218	uschar *
	219	tls_cert_not_after(void * cert, uschar * mod)
	220	{
	221	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
	222	}
	223
	224	uschar *
	225	tls_cert_serial_number(void * cert, uschar * mod)
	226	{
	227	uschar txt[256];
	228	BIO * bp = BIO_new(BIO_s_mem());
	229	int len;
	230
	231	if (!bp) return badalloc();
	232
	233	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
	234	if (len < sizeof(txt))
	235	BIO_read(bp, txt, len);
	236	else
	237	len = 0;
	238	BIO_free(bp);
	239	return string_copynlc(txt, len); /* lowercase */
	240	}
	241
	242	uschar *
243	tls_cert_signature(void * cert, uschar * mod)
244	{
245	uschar * cp = NULL;
246	BIO * bp = BIO_new(BIO_s_mem());
247
248	if (!bp) return badalloc();
249
250	if (X509_print_ex(bp, (X509 *)cert, 0,
2ea97746 CE	251	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
	252	X509_FLAG_NO_SIGNAME \| X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
	253	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
420a0d19 CE	254	/* X509_FLAG_NO_SIGDUMP is the missing one */
	255	X509_FLAG_NO_AUX) == 1)
	256	{
	257	long len = BIO_get_mem_data(bp, &cp);
	258
	259	/* Strip leading "Signature Algorithm" line */
	260	while (cp && cp != '\n') { cp++; len--; }
	261
	262	cp = string_copyn(cp+1, len-1);
	263	}
	264	BIO_free(bp);
	265	return cp;
	266	}
	267
	268	uschar *
	269	tls_cert_signature_algorithm(void * cert, uschar * mod)
	270	{
	271	uschar * cp = NULL;
	272	BIO * bp = BIO_new(BIO_s_mem());
	273
	274	if (!bp) return badalloc();
	275
	276	if (X509_print_ex(bp, (X509 *)cert, 0,
2ea97746	277	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
420a0d19	278	/* X509_FLAG_NO_SIGNAME is the missing one */
2ea97746 CE	279	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
2ea97746 CE	280	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
420a0d19 CE	281	X509_FLAG_NO_SIGDUMP \| X509_FLAG_NO_AUX) == 1)
	282	{
	283	long len = BIO_get_mem_data(bp, &cp);
	284
	285	/* Strip leading " Signature Algorithm: " and trailing newline */
	286	while (cp && cp != ':') { cp++; len--; }
	287	do { cp++; len--; } while (cp && cp == ' ');
	288	if (cp[len-1] == '\n') len--;
	289
	290	cp = string_copyn(cp, len);
	291	}
	292	BIO_free(bp);
	293	return cp;
	294	}
	295
	296	uschar *
	297	tls_cert_subject(void * cert, uschar * mod)
	298	{
	299	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
	300	return mod ? tls_field_from_dn(cp, mod) : cp;
	301	}
	302
	303	uschar *
	304	tls_cert_version(void * cert, uschar * mod)
	305	{
2ea97746	306	return string_sprintf("%ld", X509_get_version((X509 *)cert));
420a0d19 CE	307	}
	308
	309	uschar *
	310	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	311	{
	312	int nid = OBJ_create(CS oid, "", "");
	313	int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
	314	X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
	315	ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
	316	BIO * bp = BIO_new(BIO_s_mem());
	317	long len;
	318	uschar * cp1;
	319	uschar * cp2;
	320	uschar * cp3;
	321
	322	if (!bp) return badalloc();
	323
2ea97746 CE	324	#ifdef EXIM_HAVE_ASN1_MACROS
	325	ASN1_STRING_print(bp, adata);
	326	#else
420a0d19	327	M_ASN1_OCTET_STRING_print(bp, adata);
2ea97746	328	#endif
420a0d19	329
2ea97746	330	/* binary data, DER encoded */
420a0d19 CE	331	/* just dump for now */
	332	len = BIO_get_mem_data(bp, &cp1);
	333	cp3 = cp2 = store_get(len*3+1);
	334
	335	while(len)
	336	{
2ea97746	337	cp2 += sprintf(CS cp2, "%.2x ", *cp1++);
420a0d19 CE	338	len--;
	339	}
	340	cp2[-1] = '\0';
	341
	342	return cp3;
	343	}
	344
	345	uschar *
	346	tls_cert_subject_altname(void * cert, uschar * mod)
	347	{
2ea97746	348	gstring * list = NULL;
420a0d19 CE	349	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
420a0d19 CE	350	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
2ea97746	351	uschar osep = '\n';
420a0d19 CE	352	uschar * tag = US"";
	353	uschar * ele;
	354	int match = -1;
	355	int len;
	356
	357	if (!san) return NULL;
	358
2ea97746	359	while (mod && *mod)
420a0d19	360	{
2ea97746 CE	361	if (mod == '>' && ++mod) osep = *mod++;
	362	else if (Ustrncmp(mod,"dns",3)==0) { match = GEN_DNS; mod += 3; }
	363	else if (Ustrncmp(mod,"uri",3)==0) { match = GEN_URI; mod += 3; }
	364	else if (Ustrncmp(mod,"mail",4)==0) { match = GEN_EMAIL; mod += 4; }
	365	else mod++;
420a0d19	366
2ea97746	367	if (*mod == ',') mod++;
420a0d19 CE	368	}
	369
	370	while (sk_GENERAL_NAME_num(san) > 0)
	371	{
	372	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
	373	if (match != -1 && match != namePart->type)
	374	continue;
	375	switch (namePart->type)
	376	{
	377	case GEN_DNS:
	378	tag = US"DNS";
2ea97746	379	ele = US ASN1_STRING_get0_data(namePart->d.dNSName);
420a0d19 CE	380	len = ASN1_STRING_length(namePart->d.dNSName);
	381	break;
	382	case GEN_URI:
	383	tag = US"URI";
2ea97746	384	ele = US ASN1_STRING_get0_data(namePart->d.uniformResourceIdentifier);
420a0d19 CE	385	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
	386	break;
	387	case GEN_EMAIL:
	388	tag = US"MAIL";
2ea97746	389	ele = US ASN1_STRING_get0_data(namePart->d.rfc822Name);
420a0d19 CE	390	len = ASN1_STRING_length(namePart->d.rfc822Name);
	391	break;
	392	default:
	393	continue; /* ignore unrecognised types */
	394	}
	395	if (ele[len]) /* not nul-terminated */
	396	ele = string_copyn(ele, len);
	397
2ea97746 CE	398	if (Ustrlen(ele) == len) /* ignore any with embedded nul */
2ea97746 CE	399	list = string_append_listele(list, osep,
420a0d19 CE	400	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
	401	}
	402
	403	sk_GENERAL_NAME_free(san);
2ea97746	404	return string_from_gstring(list);
420a0d19 CE	405	}
	406
	407	uschar *
	408	tls_cert_ocsp_uri(void * cert, uschar * mod)
	409	{
	410	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
	411	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
	412	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
	413	int i;
	414	uschar sep = '\n';
2ea97746	415	gstring * list = NULL;
420a0d19 CE	416
	417	if (mod)
	418	if (mod == '>' && ++mod) sep = *mod++;
	419
	420	for (i = 0; i < adsnum; i++)
	421	{
	422	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	423
	424	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
2ea97746 CE	425	list = string_append_listele_n(list, sep,
	426	US ASN1_STRING_get0_data(ad->location->d.ia5),
	427	ASN1_STRING_length(ad->location->d.ia5));
420a0d19	428	}
2ea97746 CE	429	sk_ACCESS_DESCRIPTION_free(ads);
2ea97746 CE	430	return string_from_gstring(list);
420a0d19 CE	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';
2ea97746	443	gstring * list = NULL;
420a0d19 CE	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	)
2ea97746 CE	460	list = string_append_listele_n(list, sep,
	461	US ASN1_STRING_get0_data(np->d.uniformResourceIdentifier),
	462	ASN1_STRING_length(np->d.uniformResourceIdentifier));
420a0d19	463	}
2ea97746 CE	464	sk_DIST_POINT_free(dps);
2ea97746 CE	465	return string_from_gstring(list);
420a0d19 CE	466	}
	467
	468
	469
	470	/*****************************************************
	471	* Certificate operator routines
	472	*****************************************************/
2ea97746 CE	473	uschar *
	474	tls_cert_der_b64(void * cert)
	475	{
	476	BIO * bp = BIO_new(BIO_s_mem());
	477	uschar * cp = NULL;
	478
	479	if (!i2d_X509_bio(bp, (X509 *)cert))
	480	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	481	ERR_error_string(ERR_get_error(), NULL));
	482	else
	483	{
	484	long len = BIO_get_mem_data(bp, &cp);
	485	cp = b64encode(cp, (int)len);
	486	}
	487
	488	BIO_free(bp);
	489	return cp;
	490	}
	491
	492
420a0d19 CE	493	static uschar *
	494	fingerprint(X509 * cert, const EVP_MD * fdig)
	495	{
	496	int j;
	497	unsigned int n;
	498	uschar md[EVP_MAX_MD_SIZE];
	499	uschar * cp;
	500
	501	if (!X509_digest(cert,fdig,md,&n))
	502	{
	503	expand_string_message = US"tls_cert_fprt: out of mem\n";
	504	return NULL;
	505	}
	506	cp = store_get(n*2+1);
	507	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
	508	return(cp);
	509	}
	510
2ea97746	511	uschar *
420a0d19 CE	512	tls_cert_fprt_md5(void * cert)
	513	{
	514	return fingerprint((X509 *)cert, EVP_md5());
	515	}
	516
2ea97746	517	uschar *
420a0d19 CE	518	tls_cert_fprt_sha1(void * cert)
	519	{
	520	return fingerprint((X509 *)cert, EVP_sha1());
	521	}
	522
2ea97746	523	uschar *
420a0d19 CE	524	tls_cert_fprt_sha256(void * cert)
	525	{
	526	return fingerprint((X509 *)cert, EVP_sha256());
	527	}
	528
	529
	530	/* vi: aw ai sw=2
	531	*/
	532	/* End of tlscert-openssl.c */