* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) Jeremy Harris 2014 */
+/* 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.
#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
void * reset_point = store_get(0);
const uschar * cp = string_unprinting(US buf);
BIO * bp;
-X509 * x;
+X509 * x = *(X509 **)cert;
+int fail = 0;
+
+if (x) X509_free(x);
bp = BIO_new_mem_buf(US cp, -1);
-x = PEM_read_bio_X509(bp, NULL, 0, NULL);
-int fail = 0;
-if (!x)
+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);
}
void
-tls_free_cert(void * cert)
+tls_free_cert(void ** cert)
{
-X509_free((X509 *)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 = "";
+uschar * cp = US"";
len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
cp = string_copyn(cp, len);
BIO_free(bp);
}
static uschar *
-asn1_time_copy(const ASN1_TIME * time)
+asn1_time_copy(const ASN1_TIME * asntime, uschar * mod)
{
+uschar * s = NULL;
BIO * bp = BIO_new(BIO_s_mem());
-int len = ASN1_TIME_print(bp, time);
-return bio_string_copy(bp, len);
+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 =
+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)
+tls_cert_issuer(void * cert, uschar * mod)
{
-return x509_name_copy(X509_get_issuer_name((X509 *)cert));
+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)
+tls_cert_not_before(void * cert, uschar * mod)
{
-return asn1_time_copy(X509_get_notBefore((X509 *)cert));
+return asn1_time_copy(X509_get_notBefore((X509 *)cert), mod);
}
uschar *
-tls_cert_not_after(void * cert)
+tls_cert_not_after(void * cert, uschar * mod)
{
-return asn1_time_copy(X509_get_notAfter((X509 *)cert));
+return asn1_time_copy(X509_get_notAfter((X509 *)cert), mod);
}
uschar *
-tls_cert_serial_number(void * cert)
+tls_cert_serial_number(void * cert, uschar * mod)
{
uschar txt[256];
BIO * bp = BIO_new(BIO_s_mem());
-int len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
+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
}
uschar *
-tls_cert_signature(void * cert)
+tls_cert_signature(void * cert, uschar * mod)
{
-BIO * bp = BIO_new(BIO_s_mem());
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_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);
- cp = string_copyn(cp, len);
+
+ /* 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)
+tls_cert_signature_algorithm(void * cert, uschar * mod)
{
-return string_copy(OBJ_nid2ln(X509_get_signature_type((X509 *)cert)));
+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)
+tls_cert_subject(void * cert, uschar * mod)
{
-return x509_name_copy(X509_get_subject_name((X509 *)cert));
+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)
+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(oid, "", "");
+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);
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);
-/* binary data, DER encoded */
+#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(cp2, "%.2x ", *cp1++);
+ sprintf(CS cp2, "%.2x ", *cp1++);
cp2 += 3;
len--;
}
}
uschar *
-tls_cert_subject_altname(void * cert)
+tls_cert_subject_altname(void * cert, uschar * mod)
{
-uschar * cp;
+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:
- cp = string_sprintf("URI=%s",
- ASN1_STRING_data(namePart->d.uniformResourceIdentifier));
- return cp;
+ tag = US"URI";
+ ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
+ len = ASN1_STRING_length(namePart->d.uniformResourceIdentifier);
+ break;
case GEN_EMAIL:
- cp = string_sprintf("email=%s",
- ASN1_STRING_data(namePart->d.rfc822Name));
- return cp;
+ tag = US"MAIL";
+ ele = ASN1_STRING_data(namePart->d.rfc822Name);
+ len = ASN1_STRING_length(namePart->d.rfc822Name);
+ break;
default:
- cp = string_sprintf("Unrecognisable");
- return cp;
+ 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_pop_free(gen_names, GENERAL_NAME_free); ??? */
-return cp;
+sk_GENERAL_NAME_free(san);
+return list;
}
uschar *
-tls_cert_ocsp_uri(void * cert)
+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)
- return string_copy( ASN1_STRING_data(ad->location->d.ia5) );
+ {
+ 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);
+ }
}
-
-return NULL;
+sk_ACCESS_DESCRIPTION_free(ads);
+return list;
}
uschar *
-tls_cert_crl_uri(void * cert)
+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,
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)))
if ( (np = sk_GENERAL_NAME_value(names, j))
&& np->type == GEN_URI
)
- return string_copy(ASN1_STRING_data(
- np->d.uniformResourceIdentifier));
+ {
+ 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);
+ }
}
-return NULL;
+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 */
projects / exim.git / blobdiff