* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) Jeremy Harris 2014 - 2015 */
+/* Copyright (c) The Exim Maintainers 2021 - 2022 */
+/* Copyright (c) Jeremy Harris 2014 - 2018 */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file provides TLS/SSL support for Exim using the GnuTLS library,
one of the available supported implementations. This file is #included into
/*****************************************************
* Export/import a certificate, binary/printable
-*****************************************************/
-int
+******************************************************
+Return: boolean success
+*/
+
+BOOL
tls_export_cert(uschar * buf, size_t buflen, void * cert)
{
size_t sz = buflen;
-void * reset_point = store_get(0);
-int fail;
+rmark reset_point = store_mark();
+BOOL fail;
const uschar * cp;
if ((fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
{
log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
gnutls_strerror(fail));
- return 1;
+ return FALSE;
}
if ((cp = string_printing(buf)) != buf)
{
fail = 1;
}
store_reset(reset_point);
-return fail;
+return !fail;
}
-int
+/* On error, NULL out the destination */
+BOOL
tls_import_cert(const uschar * buf, void ** cert)
{
-void * reset_point = store_get(0);
+rmark reset_point = store_mark();
gnutls_datum_t datum;
gnutls_x509_crt_t crt = *(gnutls_x509_crt_t *)cert;
-int fail = 0;
+int rc;
if (crt)
gnutls_x509_crt_deinit(crt);
datum.data = string_unprinting(US buf);
datum.size = Ustrlen(datum.data);
-if ((fail = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM)))
+if ((rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM)))
{
log_write(0, LOG_MAIN, "TLS error in certificate import: %s",
- gnutls_strerror(fail));
- fail = 1;
+ gnutls_strerror(rc));
+ crt = NULL;
}
-else
- *cert = (void *)crt;
-
+*cert = (void *)crt;
store_reset(reset_point);
-return fail;
+return rc != 0;
}
void
if (mod && Ustrcmp(mod, "int") == 0)
return string_sprintf("%u", (unsigned)t);
-cp = store_get(len);
-if (timestamps_utc)
+cp = store_get(len, GET_UNTAINTED);
+if (f.timestamps_utc)
{
uschar * tz = to_tz(US"GMT0");
len = strftime(CS cp, len, "%b %e %T %Y %Z", gmtime(&t));
int ret;
size_t siz = 0;
-if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz))
+if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz))
!= GNUTLS_E_SHORT_MEMORY_BUFFER)
return g_err("gi0", __FUNCTION__, ret);
-cp = store_get(siz);
-if ((ret = gnutls_x509_crt_get_issuer_dn(cert, cp, &siz)) < 0)
+cp = store_get(siz, GET_TAINTED);
+if ((ret = gnutls_x509_crt_get_issuer_dn(cert, CS cp, &siz)) < 0)
return g_err("gi1", __FUNCTION__, ret);
return mod ? tls_field_from_dn(cp, mod) : cp;
tls_cert_serial_number(void * cert, uschar * mod)
{
uschar bin[50], txt[150];
+uschar * sp = bin;
size_t sz = sizeof(bin);
-uschar * sp;
-uschar * dp;
int ret;
if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
bin, &sz)))
return g_err("gs0", __FUNCTION__, ret);
-for(dp = txt, sp = bin; sz; dp += 2, sp++, sz--)
- sprintf(dp, "%.2x", *sp);
+for(uschar * dp = txt; sz; sz--)
+ dp += sprintf(CS dp, "%.2x", *sp++);
for(sp = txt; sp[0]=='0' && sp[1]; ) sp++; /* leading zeroes */
return string_copy(sp);
}
size_t len = 0;
int ret;
-if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len))
+if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len))
!= GNUTLS_E_SHORT_MEMORY_BUFFER)
return g_err("gs0", __FUNCTION__, ret);
-cp1 = store_get(len*4+1);
-if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len) != 0)
+cp1 = store_get(len*4+1, GET_TAINTED);
+if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, CS cp1, &len) != 0)
return g_err("gs1", __FUNCTION__, ret);
-for(cp3 = cp2 = cp1+len; cp1 < cp2; cp3 += 3, cp1++)
- sprintf(cp3, "%.2x ", *cp1);
+for(cp3 = cp2 = cp1+len; cp1 < cp2; cp1++)
+ cp3 += sprintf(CS cp3, "%.2x ", *cp1);
cp3[-1]= '\0';
return cp2;
{
gnutls_sign_algorithm_t algo =
gnutls_x509_crt_get_signature_algorithm((gnutls_x509_crt_t)cert);
-return algo < 0 ? NULL : string_copy(gnutls_sign_get_name(algo));
+return algo < 0 ? NULL : string_copy(US gnutls_sign_get_name(algo));
}
uschar *
int ret;
size_t siz = 0;
-if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz))
+if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz))
!= GNUTLS_E_SHORT_MEMORY_BUFFER)
return g_err("gs0", __FUNCTION__, ret);
-cp = store_get(siz);
-if ((ret = gnutls_x509_crt_get_dn(cert, cp, &siz)) < 0)
+cp = store_get(siz, GET_TAINTED);
+if ((ret = gnutls_x509_crt_get_dn(cert, CS cp, &siz)) < 0)
return g_err("gs1", __FUNCTION__, ret);
return mod ? tls_field_from_dn(cp, mod) : cp;
int ret;
ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
- oid, idx, cp1, &siz, &crit);
+ CS oid, idx, CS cp1, &siz, &crit);
if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
return g_err("ge0", __FUNCTION__, ret);
-cp1 = store_get(siz*4 + 1);
+cp1 = store_get(siz*4 + 1, GET_TAINTED);
ret = gnutls_x509_crt_get_extension_by_oid ((gnutls_x509_crt_t)cert,
- oid, idx, cp1, &siz, &crit);
+ CS oid, idx, CS cp1, &siz, &crit);
if (ret < 0)
return g_err("ge1", __FUNCTION__, ret);
/* binary data, DER encoded */
/* just dump for now */
-for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp3 += 3, cp1++)
- sprintf(cp3, "%.2x ", *cp1);
+for(cp3 = cp2 = cp1+siz; cp1 < cp2; cp1++)
+ cp3 += sprintf(CS cp3, "%.2x ", *cp1);
cp3[-1]= '\0';
return cp2;
uschar *
tls_cert_subject_altname(void * cert, uschar * mod)
{
-uschar * list = NULL;
-int index;
+gstring * list = NULL;
size_t siz;
int ret;
uschar sep = '\n';
uschar * ele;
int match = -1;
-while (mod)
+if (mod) while (*mod)
{
if (*mod == '>' && *++mod) sep = *mod++;
- else if (Ustrcmp(mod, "dns")==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
- else if (Ustrcmp(mod, "uri")==0) { match = GNUTLS_SAN_URI; mod += 3; }
- else if (Ustrcmp(mod, "mail")==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
- else continue;
+ else if (Ustrncmp(mod, "dns", 3)==0) { match = GNUTLS_SAN_DNSNAME; mod += 3; }
+ else if (Ustrncmp(mod, "uri", 3)==0) { match = GNUTLS_SAN_URI; mod += 3; }
+ else if (Ustrncmp(mod, "mail", 4)==0) { match = GNUTLS_SAN_RFC822NAME; mod += 4; }
+ else break;
if (*mod++ != ',')
break;
}
-for(index = 0;; index++)
+for (int index = 0;; index++)
{
siz = 0;
switch(ret = gnutls_x509_crt_get_subject_alt_name(
(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL))
{
case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
- return list; /* no more elements; normal exit */
+ return string_from_gstring(list); /* no more elements; normal exit */
case GNUTLS_E_SHORT_MEMORY_BUFFER:
break;
return g_err("gs0", __FUNCTION__, ret);
}
- ele = store_get(siz+1);
+ ele = store_get(siz+1, GET_TAINTED);
if ((ret = gnutls_x509_crt_get_subject_alt_name(
(gnutls_x509_crt_t)cert, index, ele, &siz, NULL)) < 0)
return g_err("gs1", __FUNCTION__, ret);
gnutls_datum_t uri;
int ret;
uschar sep = '\n';
-int index;
-uschar * list = NULL;
+gstring * list = NULL;
if (mod)
if (*mod == '>' && *++mod) sep = *mod++;
-for(index = 0;; index++)
+for (int index = 0;; index++)
{
ret = gnutls_x509_crt_get_authority_info_access((gnutls_x509_crt_t)cert,
index, GNUTLS_IA_OCSP_URI, &uri, NULL);
if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
- return list;
+ return string_from_gstring(list);
if (ret < 0)
return g_err("gai", __FUNCTION__, ret);
- list = string_append_listele(list, sep,
- string_copyn(uri.data, uri.size));
+ list = string_append_listele_n(list, sep, uri.data, uri.size);
}
/*NOTREACHED*/
tls_cert_crl_uri(void * cert, uschar * mod)
{
int ret;
-size_t siz;
uschar sep = '\n';
-int index;
-uschar * list = NULL;
+gstring * list = NULL;
uschar * ele;
if (mod)
if (*mod == '>' && *++mod) sep = *mod++;
-for(index = 0;; index++)
+for (int index = 0;; index++)
{
- siz = 0;
+ size_t siz = 0;
switch(ret = gnutls_x509_crt_get_crl_dist_points(
(gnutls_x509_crt_t)cert, index, NULL, &siz, NULL, NULL))
{
case GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE:
- return list;
+ return string_from_gstring(list);
case GNUTLS_E_SHORT_MEMORY_BUFFER:
break;
default:
return g_err("gc0", __FUNCTION__, ret);
}
- ele = store_get(siz+1);
+ ele = store_get(siz, GET_TAINTED);
if ((ret = gnutls_x509_crt_get_crl_dist_points(
(gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
return g_err("gc1", __FUNCTION__, ret);
- ele[siz] = '\0';
- list = string_append_listele(list, sep, ele);
+ list = string_append_listele_n(list, sep, ele, siz);
}
/*NOTREACHED*/
}
/*****************************************************
* Certificate operator routines
*****************************************************/
+uschar *
+tls_cert_der_b64(void * cert)
+{
+size_t len = 0;
+uschar * cp = NULL;
+int fail;
+
+if ( (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
+ GNUTLS_X509_FMT_DER, cp, &len)) != GNUTLS_E_SHORT_MEMORY_BUFFER
+ || !(cp = store_get((int)len, GET_TAINTED), TRUE) /* tainted */
+ || (fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
+ GNUTLS_X509_FMT_DER, cp, &len))
+ )
+ {
+ log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
+ gnutls_strerror(fail));
+ return NULL;
+ }
+return b64encode(CUS cp, (int)len);
+}
+
+
static uschar *
fingerprint(gnutls_x509_crt_t cert, gnutls_digest_algorithm_t algo)
{
size_t siz = 0;
uschar * cp;
uschar * cp2;
-uschar * cp3;
if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, NULL, &siz))
!= GNUTLS_E_SHORT_MEMORY_BUFFER)
return g_err("gf0", __FUNCTION__, ret);
-cp = store_get(siz*3+1);
+cp = store_get(siz*3+1, GET_TAINTED);
if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
return g_err("gf1", __FUNCTION__, ret);
-for (cp3 = cp2 = cp+siz; cp < cp2; cp++, cp3+=2)
- sprintf(cp3, "%02X",*cp);
+for (uschar * cp3 = cp2 = cp+siz; cp < cp2; cp++)
+ cp3 += sprintf(CS cp3, "%02X", *cp);
return cp2;
}
git://git.exim.org / exim.git / blobdiff