* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) Jeremy Harris 2014 */
+/* Copyright (c) The Exim Maintainers 2021 - 2022 */
+/* Copyright (c) Jeremy Harris 2014 - 2018 */
+/* SPDX-License-Identifier: GPL-2.0-only */
/* 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 = 0;
-uschar * cp;
+rmark reset_point = store_mark();
+BOOL fail;
+const uschar * cp;
-if (gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
- GNUTLS_X509_FMT_PEM, buf, &sz))
- return 1;
+if ((fail = gnutls_x509_crt_export((gnutls_x509_crt_t)cert,
+ GNUTLS_X509_FMT_PEM, buf, &sz)))
+ {
+ log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
+ gnutls_strerror(fail));
+ return FALSE;
+ }
if ((cp = string_printing(buf)) != buf)
{
Ustrncpy(buf, cp, buflen);
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;
-int fail = 0;
+gnutls_x509_crt_t crt = *(gnutls_x509_crt_t *)cert;
+int rc;
+
+if (crt)
+ gnutls_x509_crt_deinit(crt);
+else
+ gnutls_global_init();
-gnutls_global_init();
gnutls_x509_crt_init(&crt);
datum.data = string_unprinting(US buf);
datum.size = Ustrlen(datum.data);
-if (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM))
- fail = 1;
-else
- *cert = (void *)crt;
-
+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(rc));
+ crt = NULL;
+ }
+*cert = (void *)crt;
store_reset(reset_point);
-return fail;
+return rc != 0;
}
void
-tls_free_cert(void * cert)
+tls_free_cert(void ** cert)
{
-gnutls_x509_crt_deinit((gnutls_x509_crt_t) cert);
-gnutls_global_deinit();
+gnutls_x509_crt_t crt = *(gnutls_x509_crt_t *)cert;
+if (crt)
+ {
+ gnutls_x509_crt_deinit(crt);
+ gnutls_global_deinit();
+ *cert = NULL;
+ }
}
/*****************************************************
* Certificate field extraction routines
*****************************************************/
+
+/* First, some internal service functions */
+
static uschar *
-time_copy(time_t t)
+g_err(const char * tag, const char * from, int gnutls_err)
{
-uschar * cp = store_get(32);
-struct tm * tp = gmtime(&t);
-size_t len = strftime(CS cp, 32, "%b %e %T %Y %Z", tp);
+expand_string_message = string_sprintf("%s: %s fail: %s\n",
+ from, tag, gnutls_strerror(gnutls_err));
+return NULL;
+}
+
+
+static uschar *
+time_copy(time_t t, uschar * mod)
+{
+uschar * cp;
+size_t len = 32;
+
+if (mod && Ustrcmp(mod, "int") == 0)
+ return string_sprintf("%u", (unsigned)t);
+
+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));
+ restore_tz(tz);
+ }
+else
+ len = strftime(CS cp, len, "%b %e %T %Y %Z", localtime(&t));
return len > 0 ? cp : NULL;
}
+
/**/
+/* 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 txt[256];
-size_t sz = sizeof(txt);
-return ( gnutls_x509_crt_get_issuer_dn(cert, CS txt, &sz) == 0 )
- ? string_copy(txt) : NULL;
+uschar * cp = NULL;
+int ret;
+size_t siz = 0;
+
+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, 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;
}
uschar *
tls_cert_not_after(void * cert, uschar * mod)
{
return time_copy(
- gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert));
+ gnutls_x509_crt_get_expiration_time((gnutls_x509_crt_t)cert),
+ mod);
}
uschar *
tls_cert_not_before(void * cert, uschar * mod)
{
return time_copy(
- gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert));
+ gnutls_x509_crt_get_activation_time((gnutls_x509_crt_t)cert),
+ mod);
}
uschar *
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 (gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
- bin, &sz) || sz > sizeof(bin))
- return NULL;
-for(dp = txt, sp = bin; sz; dp += 2, sp++, sz--)
- sprintf(dp, "%.2x", *sp);
+if ((ret = gnutls_x509_crt_get_serial((gnutls_x509_crt_t)cert,
+ bin, &sz)))
+ return g_err("gs0", __FUNCTION__, ret);
+
+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);
}
uschar *
tls_cert_signature(void * cert, uschar * mod)
{
-uschar * cp1;
+uschar * cp1 = NULL;
uschar * cp2;
uschar * cp3;
size_t len = 0;
int ret;
-if ((ret = gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len)) !=
- GNUTLS_E_SHORT_MEMORY_BUFFER)
- {
- fprintf(stderr, "%s: gs0 fail: %s\n", __FUNCTION__, gnutls_strerror(ret));
- return NULL;
- }
+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);
+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);
-if (gnutls_x509_crt_get_signature((gnutls_x509_crt_t)cert, cp1, &len) != 0)
- {
- fprintf(stderr, "%s: gs1 fail\n", __FUNCTION__);
- return NULL;
- }
-
-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 *
tls_cert_subject(void * cert, uschar * mod)
{
-static uschar txt[256];
-size_t sz = sizeof(txt);
-return ( gnutls_x509_crt_get_dn(cert, CS txt, &sz) == 0 )
- ? string_copy(txt) : NULL;
+uschar * cp = NULL;
+int ret;
+size_t siz = 0;
+
+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, 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;
}
uschar *
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)
- {
- fprintf(stderr, "%s: ge0 fail: %s\n", __FUNCTION__, gnutls_strerror(ret));
- return NULL;
- }
+ 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)
- {
- fprintf(stderr, "%s: ge1 fail: %s\n", __FUNCTION__, gnutls_strerror(ret));
- return NULL;
- }
+ 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))
+ (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;
default:
- expand_string_message =
- string_sprintf("%s: gs0 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
+ 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)
- {
- expand_string_message =
- string_sprintf("%s: gs1 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
- }
+ return g_err("gs1", __FUNCTION__, ret);
ele[siz] = '\0';
- if (match != -1 && match != ret)
+ if ( match != -1 && match != ret /* wrong type of SAN */
+ || Ustrlen(ele) != siz) /* contains a NUL */
continue;
switch (ret)
{
case GNUTLS_SAN_DNSNAME: tag = US"DNS"; break;
- case GNUTLS_SAN_URI: tag = US"URI"; break;
+ case GNUTLS_SAN_URI: tag = US"URI"; break;
case GNUTLS_SAN_RFC822NAME: tag = US"MAIL"; break;
default: continue; /* ignore unrecognised types */
}
- list = string_append_listele(list, sep,
+ list = string_append_listele(list, sep,
match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
}
/*NOTREACHED*/
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)
- {
- expand_string_message =
- string_sprintf("%s: gai fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
- }
+ 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*/
#else
-expand_string_message =
+expand_string_message =
string_sprintf("%s: OCSP support with GnuTLS requires version 3.0.0\n",
__FUNCTION__);
return NULL;
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:
- expand_string_message =
- string_sprintf("%s: gc0 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
+ 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)
- {
- expand_string_message =
- string_sprintf("%s: gc1 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
- }
- ele[siz] = '\0';
- list = string_append_listele(list, sep, ele);
+ (gnutls_x509_crt_t)cert, index, ele, &siz, NULL, NULL)) < 0)
+ return g_err("gc1", __FUNCTION__, ret);
+
+ 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)
- {
- expand_string_message =
- string_sprintf("%s: gf0 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
- }
-cp = store_get(siz*3+1);
+ return g_err("gf0", __FUNCTION__, ret);
+
+cp = store_get(siz*3+1, GET_TAINTED);
if ((ret = gnutls_x509_crt_get_fingerprint(cert, algo, cp, &siz)) < 0)
- {
- expand_string_message =
- string_sprintf("%s: gf1 fail: %d %s\n", __FUNCTION__,
- ret, gnutls_strerror(ret));
- return NULL;
- }
-for (cp3 = cp2 = cp+siz; cp < cp2; cp++, cp3+=2)
- sprintf(cp3, "%02X",*cp);
+ return g_err("gf1", __FUNCTION__, ret);
+
+for (uschar * cp3 = cp2 = cp+siz; cp < cp2; cp++)
+ cp3 += sprintf(CS cp3, "%02X", *cp);
return cp2;
}
git://git.exim.org / exim.git / blobdiff