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

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

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

/* This module provides TLS (aka SSL) support for Exim using the OpenSSL
library. It is #included into the tls.c file when that library is used.
*/


/* Heading stuff */

#include <openssl/lhash.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/x509v3.h>


/*****************************************************
*  Export/import a certificate, binary/printable
*****************************************************/
int
tls_export_cert(uschar * buf, size_t buflen, void * cert)
{
BIO * bp = BIO_new(BIO_s_mem());
int fail;

if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
  log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
    ERR_error_string(ERR_get_error(), NULL));
else
  {
  char * cp = CS buf;
  int n;
  buflen -= 2;
  for(;;)
    {
    if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
    cp += n+1;
    buflen -= n+1;
    cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
    }				 /* compat with string_printing() */
  *cp = '\0';
  }

BIO_free(bp);
return fail;
}

int
tls_import_cert(const uschar * buf, void ** cert)
{
void * reset_point = store_get(0);
const uschar * cp = string_unprinting(US buf);
BIO * bp;
X509 * x = *(X509 **)cert;
int fail = 0;

if (x) X509_free(x);

bp = BIO_new_mem_buf(US cp, -1);
if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
  {
  log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
    ERR_error_string(ERR_get_error(), NULL));
  fail = 1;
  }
else
  *cert = (void *)x;
BIO_free(bp);
store_reset(reset_point);
return fail;
}

void
tls_free_cert(void ** cert)
{
X509 * 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, &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 (!strptime(CCS s, "%b %e %T %Y %Z", &tm))
    expand_string_message = US"failed time conversion";

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

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

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

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

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

static uschar *
x509_name_copy(X509_NAME * name)
{
BIO * bp = BIO_new(BIO_s_mem());
int len_good;

if (!bp) return badalloc();

len_good =
  X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
  ? 1 : 0;
return bio_string_copy(bp, len_good);
}

/**/
/* Now the extractors, called from expand.c
Arguments:
  cert		The certificate
  mod		Optional modifiers for the operator

Return:
  Allocated string with extracted value
*/

uschar *
tls_cert_issuer(void * cert, uschar * mod)
{
uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_not_before(void * cert, uschar * mod)
{
return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
}

uschar *
tls_cert_not_after(void * cert, uschar * mod)
{
return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
}

uschar *
tls_cert_serial_number(void * cert, uschar * mod)
{
uschar txt[256];
BIO * bp = BIO_new(BIO_s_mem());
int len;

if (!bp) return badalloc();

len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
if (len < sizeof(txt))
  BIO_read(bp, txt, len);
else
  len = 0;
BIO_free(bp);
return string_copynlc(txt, len);	/* lowercase */
}

uschar *
tls_cert_signature(void * cert, uschar * mod)
{
uschar * cp = NULL;
BIO * bp = BIO_new(BIO_s_mem());

if (!bp) return badalloc();

if (X509_print_ex(bp, (X509 *)cert, 0,
  X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL |
  X509_FLAG_NO_SIGNAME | X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY |
  X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS |
  /* X509_FLAG_NO_SIGDUMP is the missing one */
  X509_FLAG_NO_AUX) == 1)
  {
  long len = BIO_get_mem_data(bp, &cp);

  /* Strip leading "Signature Algorithm" line */
  while (*cp && *cp != '\n') { cp++; len--; }

  cp = string_copyn(cp+1, len-1);
  }
BIO_free(bp);
return cp;
}

uschar *
tls_cert_signature_algorithm(void * cert, uschar * mod)
{
uschar * cp = NULL;
BIO * bp = BIO_new(BIO_s_mem());

if (!bp) return badalloc();

if (X509_print_ex(bp, (X509 *)cert, 0,
  X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL |
  /* X509_FLAG_NO_SIGNAME is the missing one */
  X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY |
  X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS |
  X509_FLAG_NO_SIGDUMP | X509_FLAG_NO_AUX) == 1)
  {
  long len = BIO_get_mem_data(bp, &cp);

  /* Strip leading "    Signature Algorithm: " and trailing newline */
  while (*cp && *cp != ':') { cp++; len--; }
  do { cp++; len--; } while (*cp && *cp == ' ');
  if (cp[len-1] == '\n') len--;

  cp = string_copyn(cp, len);
  }
BIO_free(bp);
return cp;
}

uschar *
tls_cert_subject(void * cert, uschar * mod)
{
uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
return mod ? tls_field_from_dn(cp, mod) : cp;
}

uschar *
tls_cert_version(void * cert, uschar * mod)
{
return string_sprintf("%d", X509_get_version((X509 *)cert));
}

uschar *
tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
{
int nid = OBJ_create(CS oid, "", "");
int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
BIO * bp = BIO_new(BIO_s_mem());
long len;
uschar * cp1;
uschar * cp2;
uschar * cp3;

if (!bp) return badalloc();

M_ASN1_OCTET_STRING_print(bp, adata);
/* binary data, DER encoded */

/* just dump for now */
len = BIO_get_mem_data(bp, &cp1);
cp3 = cp2 = store_get(len*3+1);

while(len)
  {
  sprintf(CS cp2, "%.2x ", *cp1++);
  cp2 += 3;
  len--;
  }
cp2[-1] = '\0';

return cp3;
}

uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
uschar * list = NULL;
STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
  X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
uschar osep = '\n';
uschar * tag = US"";
uschar * ele;
int match = -1;
int len;

if (!san) return NULL;

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

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

while (sk_GENERAL_NAME_num(san) > 0)
  {
  GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
  if (match != -1 && match != namePart->type)
    continue;
  switch (namePart->type)
    {
    case GEN_DNS:
      tag = US"DNS";
      ele = ASN1_STRING_data(namePart->d.dNSName);
      len = ASN1_STRING_length(namePart->d.dNSName);
      break;
    case GEN_URI:
      tag = US"URI";
      ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
      len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
      break;
    case GEN_EMAIL:
      tag = US"MAIL";
      ele = ASN1_STRING_data(namePart->d.rfc822Name);
      len = ASN1_STRING_length(namePart->d.rfc822Name);
      break;
    default:
      continue;	/* ignore unrecognised types */
    }
  if (ele[len])	/* not nul-terminated */
    ele = string_copyn(ele, len);

  if (Ustrlen(ele) == len)	/* ignore any with embedded nul */
    list = string_append_listele(list, osep,
	  match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
  }

sk_GENERAL_NAME_free(san);
return list;
}

uschar *
tls_cert_ocsp_uri(void * cert, uschar * mod)
{
STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
  X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
int i;
uschar sep = '\n';
uschar * list = NULL;

if (mod)
  if (*mod == '>' && *++mod) sep = *mod++;

for (i = 0; i < adsnum; i++)
  {
  ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);

  if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
    {
    uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
    int len =  ASN1_STRING_length(ad->location->d.ia5);
    list = string_append_listele_n(list, sep, ele, len);
    }
  }
sk_ACCESS_DESCRIPTION_free(ads);
return list;
}

uschar *
tls_cert_crl_uri(void * cert, uschar * mod)
{
STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
  X509_get_ext_d2i((X509 *)cert,  NID_crl_distribution_points,
    NULL, NULL);
DIST_POINT * dp;
int dpsnum = sk_DIST_POINT_num(dps);
int i;
uschar sep = '\n';
uschar * list = NULL;

if (mod)
  if (*mod == '>' && *++mod) sep = *mod++;

if (dps) for (i = 0; i < dpsnum; i++)
  if ((dp = sk_DIST_POINT_value(dps, i)))
    {
    STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
    GENERAL_NAME * np;
    int nnum = sk_GENERAL_NAME_num(names);
    int j;

    for (j = 0; j < nnum; j++)
      if (  (np = sk_GENERAL_NAME_value(names, j))
	 && np->type == GEN_URI
	 )
	{
	uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
	int len =  ASN1_STRING_length(np->d.uniformResourceIdentifier);
	list = string_append_listele_n(list, sep, ele, len);
	}
    }
sk_DIST_POINT_free(dps);
return list;
}


/*****************************************************
*  Certificate operator routines
*****************************************************/
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
3386088d	5	/* Copyright (c) Jeremy Harris 2014 - 2015 */
9d1c15ef JH	6
	7	/* This module provides TLS (aka SSL) support for Exim using the OpenSSL
	8	library. It is #included into the tls.c file when that library is used.
	9	*/
	10
	11
	12	/* Heading stuff */
	13
	14	#include <openssl/lhash.h>
	15	#include <openssl/ssl.h>
	16	#include <openssl/err.h>
	17	#include <openssl/rand.h>
51424d08	18	#include <openssl/x509v3.h>
9d1c15ef JH	19
	20
	21	/*****************************************************
	22	* Export/import a certificate, binary/printable
	23	*****************************************************/
	24	int
	25	tls_export_cert(uschar * buf, size_t buflen, void * cert)
	26	{
	27	BIO * bp = BIO_new(BIO_s_mem());
	28	int fail;
	29
	30	if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
	31	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	32	ERR_error_string(ERR_get_error(), NULL));
	33	else
	34	{
	35	char * cp = CS buf;
	36	int n;
	37	buflen -= 2;
	38	for(;;)
	39	{
	40	if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
	41	cp += n+1;
	42	buflen -= n+1;
	43	cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
	44	} /* compat with string_printing() */
	45	*cp = '\0';
	46	}
	47
	48	BIO_free(bp);
	49	return fail;
	50	}
	51
	52	int
	53	tls_import_cert(const uschar * buf, void ** cert)
	54	{
	55	void * reset_point = store_get(0);
	56	const uschar * cp = string_unprinting(US buf);
	57	BIO * bp;
152e7604	58	X509 * x = (X509 *)cert;
c03fae8a	59	int fail = 0;
9d1c15ef	60
152e7604 JH	61	if (x) X509_free(x);
152e7604 JH	62
9d1c15ef	63	bp = BIO_new_mem_buf(US cp, -1);
c03fae8a JH	64	if (!(x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
	65	{
	66	log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
	67	ERR_error_string(ERR_get_error(), NULL));
9d1c15ef	68	fail = 1;
c03fae8a	69	}
9d1c15ef JH	70	else
	71	cert = (void )x;
	72	BIO_free(bp);
	73	store_reset(reset_point);
	74	return fail;
	75	}
	76
	77	void
790fbb71	78	tls_free_cert(void ** cert)
9d1c15ef	79	{
790fbb71 JH	80	X509 * x = (X509 *)cert;
	81	if (x)
	82	{
	83	X509_free(x);
	84	*cert = NULL;
	85	}
9d1c15ef JH	86	}
9d1c15ef JH	87
c03fae8a	88
9d1c15ef JH	89	/*****************************************************
	90	* Certificate field extraction routines
	91	*****************************************************/
c03fae8a JH	92
	93	/* First, some internal service functions */
	94
	95	static uschar *
	96	badalloc(void)
	97	{
	98	expand_string_message = US"allocation failure";
	99	return NULL;
	100	}
	101
9d1c15ef JH	102	static uschar *
	103	bio_string_copy(BIO * bp, int len)
	104	{
e3dd1d67	105	uschar * cp = US"";
9d1c15ef JH	106	len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
	107	cp = string_copyn(cp, len);
	108	BIO_free(bp);
	109	return cp;
	110	}
	111
	112	static uschar *
e9477a08	113	asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
9d1c15ef	114	{
e9477a08	115	uschar * s = NULL;
9d1c15ef	116	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	117	int len;
c03fae8a JH	118
e9477a08 JH	119	if (!bp)
	120	return badalloc();
	121	len = ASN1_TIME_print(bp, asntime);
	122	len = len > 0 ? (int) BIO_get_mem_data(bp, &s) : 0;
c03fae8a	123
e9477a08 JH	124	if (mod && Ustrcmp(mod, "raw") == 0) /* native ASN */
	125	s = string_copyn(s, len);
	126	else
	127	{
	128	struct tm tm;
	129	struct tm * tm_p = &tm;
755762fd	130	BOOL mod_tz = TRUE;
45500060	131	uschar * tz = to_tz(US"GMT0"); /* need to call strptime with baseline TZ */
e9477a08 JH	132
	133	/* Parse OpenSSL ASN1_TIME_print output. A shame there seems to
	134	be no other interface for the times.
	135	*/
	136
	137	/XXX %Z might be glibc-specific? Solaris has it, at least/
	138	/XXX should we switch to POSIX locale for this? /
	139	tm.tm_isdst = 0;
	140	if (!strptime(CCS s, "%b %e %T %Y %Z", &tm))
	141	expand_string_message = US"failed time conversion";
	142
	143	else
	144	{
	145	time_t t = mktime(&tm); /* make the tm self-consistent */
	146
	147	if (mod && Ustrcmp(mod, "int") == 0) /* seconds since epoch */
	148	s = string_sprintf("%u", t);
	149
	150	else
	151	{
	152	if (!timestamps_utc) /* decoded string in local TZ */
	153	{ /* shift to local TZ */
	154	restore_tz(tz);
	155	mod_tz = FALSE;
	156	tm_p = localtime(&t);
	157	}
	158	/* "utc" is default, and rfc5280 says cert times should be Zulu */
	159
	160	/* convert to string in our format */
	161	len = 32;
	162	s = store_get(len);
	163	strftime(CS s, (size_t)len, "%b %e %T %Y %z", tm_p);
	164	}
	165	}
	166
755762fd	167	if (mod_tz)
e9477a08 JH	168	restore_tz(tz);
	169	}
	170	BIO_free(bp);
	171	return s;
9d1c15ef JH	172	}
	173
	174	static uschar *
	175	x509_name_copy(X509_NAME * name)
	176	{
	177	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a JH	178	int len_good;
	179
	180	if (!bp) return badalloc();
	181
	182	len_good =
9d1c15ef JH	183	X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
	184	? 1 : 0;
	185	return bio_string_copy(bp, len_good);
	186	}
	187
	188	/**/
c03fae8a JH	189	/* Now the extractors, called from expand.c
	190	Arguments:
	191	cert The certificate
	192	mod Optional modifiers for the operator
	193
	194	Return:
	195	Allocated string with extracted value
	196	*/
9d1c15ef JH	197
9d1c15ef JH	198	uschar *
9e4dddbd	199	tls_cert_issuer(void * cert, uschar * mod)
9d1c15ef	200	{
812a6045 JH	201	uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
812a6045 JH	202	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	203	}
	204
	205	uschar *
9e4dddbd	206	tls_cert_not_before(void * cert, uschar * mod)
9d1c15ef	207	{
25ba2544	208	return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
9d1c15ef JH	209	}
	210
	211	uschar *
9e4dddbd	212	tls_cert_not_after(void * cert, uschar * mod)
9d1c15ef	213	{
25ba2544	214	return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
9d1c15ef JH	215	}
	216
	217	uschar *
9e4dddbd	218	tls_cert_serial_number(void * cert, uschar * mod)
9d1c15ef JH	219	{
	220	uschar txt[256];
	221	BIO * bp = BIO_new(BIO_s_mem());
c03fae8a	222	int len;
9d1c15ef	223
c03fae8a JH	224	if (!bp) return badalloc();
	225
	226	len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
9d1c15ef JH	227	if (len < sizeof(txt))
	228	BIO_read(bp, txt, len);
	229	else
	230	len = 0;
	231	BIO_free(bp);
	232	return string_copynlc(txt, len); /* lowercase */
	233	}
	234
	235	uschar *
9e4dddbd	236	tls_cert_signature(void * cert, uschar * mod)
9d1c15ef	237	{
9d1c15ef	238	uschar * cp = NULL;
c03fae8a JH	239	BIO * bp = BIO_new(BIO_s_mem());
	240
	241	if (!bp) return badalloc();
9d1c15ef JH	242
9d1c15ef JH	243	if (X509_print_ex(bp, (X509 *)cert, 0,
94431adb HSHR	244	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
	245	X509_FLAG_NO_SIGNAME \| X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
	246	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
9d1c15ef JH	247	/* X509_FLAG_NO_SIGDUMP is the missing one */
	248	X509_FLAG_NO_AUX) == 1)
	249	{
	250	long len = BIO_get_mem_data(bp, &cp);
315e209a JH	251
	252	/* Strip leading "Signature Algorithm" line */
	253	while (cp && cp != '\n') { cp++; len--; }
	254
	255	cp = string_copyn(cp+1, len-1);
9d1c15ef JH	256	}
	257	BIO_free(bp);
	258	return cp;
	259	}
	260
	261	uschar *
9e4dddbd	262	tls_cert_signature_algorithm(void * cert, uschar * mod)
9d1c15ef	263	{
315e209a JH	264	uschar * cp = NULL;
	265	BIO * bp = BIO_new(BIO_s_mem());
	266
	267	if (!bp) return badalloc();
	268
	269	if (X509_print_ex(bp, (X509 *)cert, 0,
94431adb	270	X509_FLAG_NO_HEADER \| X509_FLAG_NO_VERSION \| X509_FLAG_NO_SERIAL \|
315e209a	271	/* X509_FLAG_NO_SIGNAME is the missing one */
94431adb HSHR	272	X509_FLAG_NO_ISSUER \| X509_FLAG_NO_VALIDITY \|
94431adb HSHR	273	X509_FLAG_NO_SUBJECT \| X509_FLAG_NO_PUBKEY \| X509_FLAG_NO_EXTENSIONS \|
315e209a JH	274	X509_FLAG_NO_SIGDUMP \| X509_FLAG_NO_AUX) == 1)
	275	{
	276	long len = BIO_get_mem_data(bp, &cp);
	277
	278	/* Strip leading " Signature Algorithm: " and trailing newline */
	279	while (cp && cp != ':') { cp++; len--; }
	280	do { cp++; len--; } while (cp && cp == ' ');
	281	if (cp[len-1] == '\n') len--;
	282
	283	cp = string_copyn(cp, len);
	284	}
	285	BIO_free(bp);
	286	return cp;
9d1c15ef JH	287	}
	288
	289	uschar *
9e4dddbd	290	tls_cert_subject(void * cert, uschar * mod)
9d1c15ef	291	{
812a6045 JH	292	uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
812a6045 JH	293	return mod ? tls_field_from_dn(cp, mod) : cp;
9d1c15ef JH	294	}
	295
	296	uschar *
9e4dddbd	297	tls_cert_version(void * cert, uschar * mod)
9d1c15ef JH	298	{
	299	return string_sprintf("%d", X509_get_version((X509 *)cert));
	300	}
	301
	302	uschar *
	303	tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
	304	{
e3dd1d67	305	int nid = OBJ_create(CS oid, "", "");
9d1c15ef JH	306	int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
	307	X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
	308	ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
	309	BIO * bp = BIO_new(BIO_s_mem());
	310	long len;
	311	uschar * cp1;
	312	uschar * cp2;
	313	uschar * cp3;
	314
c03fae8a JH	315	if (!bp) return badalloc();
c03fae8a JH	316
9d1c15ef JH	317	M_ASN1_OCTET_STRING_print(bp, adata);
	318	/* binary data, DER encoded */
	319
	320	/* just dump for now */
	321	len = BIO_get_mem_data(bp, &cp1);
	322	cp3 = cp2 = store_get(len*3+1);
	323
	324	while(len)
	325	{
e3dd1d67	326	sprintf(CS cp2, "%.2x ", *cp1++);
9d1c15ef JH	327	cp2 += 3;
	328	len--;
	329	}
	330	cp2[-1] = '\0';
	331
	332	return cp3;
	333	}
	334
	335	uschar *
9e4dddbd	336	tls_cert_subject_altname(void * cert, uschar * mod)
9d1c15ef	337	{
9e4dddbd	338	uschar * list = NULL;
9d1c15ef JH	339	STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
9d1c15ef JH	340	X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
b3ef41c9	341	uschar osep = '\n';
9e4dddbd JH	342	uschar * tag = US"";
	343	uschar * ele;
	344	int match = -1;
e51c7be2	345	int len;
9d1c15ef JH	346
	347	if (!san) return NULL;
	348
b3ef41c9	349	while (mod && *mod)
9e4dddbd	350	{
b3ef41c9 JH	351	if (mod == '>' && ++mod) osep = *mod++;
	352	else if (Ustrncmp(mod,"dns",3)==0) { match = GEN_DNS; mod += 3; }
	353	else if (Ustrncmp(mod,"uri",3)==0) { match = GEN_URI; mod += 3; }
	354	else if (Ustrncmp(mod,"mail",4)==0) { match = GEN_EMAIL; mod += 4; }
	355	else mod++;
9e4dddbd	356
b3ef41c9	357	if (*mod == ',') mod++;
9e4dddbd JH	358	}
9e4dddbd JH	359
9d1c15ef JH	360	while (sk_GENERAL_NAME_num(san) > 0)
	361	{
	362	GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
9e4dddbd JH	363	if (match != -1 && match != namePart->type)
9e4dddbd JH	364	continue;
9d1c15ef JH	365	switch (namePart->type)
9d1c15ef JH	366	{
9e4dddbd JH	367	case GEN_DNS:
	368	tag = US"DNS";
	369	ele = ASN1_STRING_data(namePart->d.dNSName);
e51c7be2	370	len = ASN1_STRING_length(namePart->d.dNSName);
9e4dddbd	371	break;
9d1c15ef	372	case GEN_URI:
9e4dddbd JH	373	tag = US"URI";
9e4dddbd JH	374	ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
e51c7be2	375	len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
9e4dddbd	376	break;
9d1c15ef	377	case GEN_EMAIL:
9e4dddbd JH	378	tag = US"MAIL";
9e4dddbd JH	379	ele = ASN1_STRING_data(namePart->d.rfc822Name);
e51c7be2	380	len = ASN1_STRING_length(namePart->d.rfc822Name);
9e4dddbd	381	break;
9d1c15ef	382	default:
9e4dddbd	383	continue; /* ignore unrecognised types */
9d1c15ef	384	}
e51c7be2 JH	385	if (ele[len]) /* not nul-terminated */
	386	ele = string_copyn(ele, len);
	387
9acf6b94	388	if (Ustrlen(ele) == len) /* ignore any with embedded nul */
b3ef41c9	389	list = string_append_listele(list, osep,
9e4dddbd	390	match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
9d1c15ef JH	391	}
9d1c15ef JH	392
9e4dddbd JH	393	sk_GENERAL_NAME_free(san);
9e4dddbd JH	394	return list;
9d1c15ef JH	395	}
	396
	397	uschar *
9e4dddbd	398	tls_cert_ocsp_uri(void * cert, uschar * mod)
9d1c15ef JH	399	{
	400	STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
	401	X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
	402	int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
	403	int i;
9e4dddbd JH	404	uschar sep = '\n';
	405	uschar * list = NULL;
	406
	407	if (mod)
	408	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	409
	410	for (i = 0; i < adsnum; i++)
	411	{
	412	ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
	413
	414	if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
00ba27c5 JH	415	{
	416	uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
	417	int len = ASN1_STRING_length(ad->location->d.ia5);
	418	list = string_append_listele_n(list, sep, ele, len);
	419	}
9d1c15ef	420	}
00ba27c5	421	sk_ACCESS_DESCRIPTION_free(ads);
9e4dddbd	422	return list;
9d1c15ef JH	423	}
	424
	425	uschar *
9e4dddbd	426	tls_cert_crl_uri(void * cert, uschar * mod)
9d1c15ef JH	427	{
	428	STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
	429	X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
	430	NULL, NULL);
	431	DIST_POINT * dp;
	432	int dpsnum = sk_DIST_POINT_num(dps);
	433	int i;
9e4dddbd JH	434	uschar sep = '\n';
	435	uschar * list = NULL;
	436
	437	if (mod)
	438	if (mod == '>' && ++mod) sep = *mod++;
9d1c15ef JH	439
	440	if (dps) for (i = 0; i < dpsnum; i++)
	441	if ((dp = sk_DIST_POINT_value(dps, i)))
	442	{
	443	STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
	444	GENERAL_NAME * np;
	445	int nnum = sk_GENERAL_NAME_num(names);
	446	int j;
	447
	448	for (j = 0; j < nnum; j++)
	449	if ( (np = sk_GENERAL_NAME_value(names, j))
	450	&& np->type == GEN_URI
	451	)
00ba27c5 JH	452	{
	453	uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
	454	int len = ASN1_STRING_length(np->d.uniformResourceIdentifier);
	455	list = string_append_listele_n(list, sep, ele, len);
	456	}
9d1c15ef	457	}
00ba27c5	458	sk_DIST_POINT_free(dps);
9e4dddbd	459	return list;
9d1c15ef JH	460	}
9d1c15ef JH	461
6a8a60e0 JH	462
	463
	464	/*****************************************************
	465	* Certificate operator routines
	466	*****************************************************/
59b87190 JH	467	uschar *
	468	tls_cert_der_b64(void * cert)
	469	{
	470	BIO * bp = BIO_new(BIO_s_mem());
	471	uschar * cp = NULL;
	472
	473	if (!i2d_X509_bio(bp, (X509 *)cert))
	474	log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
	475	ERR_error_string(ERR_get_error(), NULL));
	476	else
	477	{
	478	long len = BIO_get_mem_data(bp, &cp);
	479	cp = b64encode(cp, (int)len);
	480	}
	481
	482	BIO_free(bp);
	483	return cp;
	484	}
	485
	486
6a8a60e0 JH	487	static uschar *
	488	fingerprint(X509 * cert, const EVP_MD * fdig)
	489	{
	490	int j;
	491	unsigned int n;
	492	uschar md[EVP_MAX_MD_SIZE];
	493	uschar * cp;
	494
	495	if (!X509_digest(cert,fdig,md,&n))
	496	{
	497	expand_string_message = US"tls_cert_fprt: out of mem\n";
	498	return NULL;
	499	}
	500	cp = store_get(n*2+1);
e3dd1d67	501	for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
6a8a60e0 JH	502	return(cp);
	503	}
	504
94431adb	505	uschar *
6a8a60e0 JH	506	tls_cert_fprt_md5(void * cert)
	507	{
	508	return fingerprint((X509 *)cert, EVP_md5());
	509	}
	510
94431adb	511	uschar *
6a8a60e0 JH	512	tls_cert_fprt_sha1(void * cert)
	513	{
	514	return fingerprint((X509 *)cert, EVP_sha1());
	515	}
	516
94431adb	517	uschar *
9ef9101c JH	518	tls_cert_fprt_sha256(void * cert)
	519	{
	520	return fingerprint((X509 *)cert, EVP_sha256());
	521	}
	522
6a8a60e0	523
9d1c15ef JH	524	/* vi: aw ai sw=2
	525	*/
	526	/* End of tlscert-openssl.c */