* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2012 */
+/* Copyright (c) University of Cambridge 1995 - 2014 */
/* See the file NOTICE for conditions of use and distribution. */
+/* Portions Copyright (c) The OpenSSL Project 1999 */
+
/* This module provides the TLS (aka SSL) support for Exim using the OpenSSL
library. It is #included into the tls.c file when that library is used. The
code herein is based on a patch that was originally contributed by Steve
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
-#ifdef EXPERIMENTAL_OCSP
-#include <openssl/ocsp.h>
+#ifndef DISABLE_OCSP
+# include <openssl/ocsp.h>
#endif
-#ifdef EXPERIMENTAL_OCSP
-#define EXIM_OCSP_SKEW_SECONDS (300L)
-#define EXIM_OCSP_MAX_AGE (-1L)
+#ifndef DISABLE_OCSP
+# define EXIM_OCSP_SKEW_SECONDS (300L)
+# define EXIM_OCSP_MAX_AGE (-1L)
#endif
#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)
-#define EXIM_HAVE_OPENSSL_TLSEXT
+# define EXIM_HAVE_OPENSSL_TLSEXT
+#endif
+
+#if !defined(EXIM_HAVE_OPENSSL_TLSEXT) && !defined(DISABLE_OCSP)
+# warning "OpenSSL library version too old; define DISABLE_OCSP in Makefile"
+# define DISABLE_OCSP
#endif
/* Structure for collecting random data for seeding. */
static BOOL client_verify_optional = FALSE;
static BOOL server_verify_optional = FALSE;
-static BOOL reexpand_tls_files_for_sni = FALSE;
+static BOOL reexpand_tls_files_for_sni = FALSE;
typedef struct tls_ext_ctx_cb {
uschar *certificate;
uschar *privatekey;
-#ifdef EXPERIMENTAL_OCSP
- uschar *ocsp_file;
- uschar *ocsp_file_expanded;
- OCSP_RESPONSE *ocsp_response;
+#ifndef DISABLE_OCSP
+ BOOL is_server;
+ union {
+ struct {
+ uschar *file;
+ uschar *file_expanded;
+ OCSP_RESPONSE *response;
+ } server;
+ struct {
+ X509_STORE *verify_store; /* non-null if status requested */
+ BOOL verify_required;
+ } client;
+ } u_ocsp;
#endif
uschar *dhparam;
/* these are cached from first expand */
uschar *server_cipher_list;
/* only passed down to tls_error: */
host_item *host;
+
+#ifdef EXPERIMENTAL_CERTNAMES
+ uschar * verify_cert_hostnames;
+#endif
} tls_ext_ctx_cb;
/* should figure out a cleanup of API to handle state preserved per
tls_ext_ctx_cb *server_static_cbinfo = NULL;
static int
-setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional, BOOL client);
+setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional,
+ int (*cert_vfy_cb)(int, X509_STORE_CTX *) );
/* Callbacks */
#ifdef EXIM_HAVE_OPENSSL_TLSEXT
static int tls_servername_cb(SSL *s, int *ad ARG_UNUSED, void *arg);
#endif
-#ifdef EXPERIMENTAL_OCSP
-static int tls_stapling_cb(SSL *s, void *arg);
+#ifndef DISABLE_OCSP
+static int tls_server_stapling_cb(SSL *s, void *arg);
#endif
+/* Extreme debug
+#ifndef DISABLE_OCSP
+void
+x509_store_dump_cert_s_names(X509_STORE * store)
+{
+STACK_OF(X509_OBJECT) * roots= store->objs;
+int i;
+static uschar name[256];
+
+for(i= 0; i<sk_X509_OBJECT_num(roots); i++)
+ {
+ X509_OBJECT * tmp_obj= sk_X509_OBJECT_value(roots, i);
+ if(tmp_obj->type == X509_LU_X509)
+ {
+ X509 * current_cert= tmp_obj->data.x509;
+ X509_NAME_oneline(X509_get_subject_name(current_cert), CS name, sizeof(name));
+ debug_printf(" %s\n", name);
+ }
+ }
+}
+#endif
+*/
+
/*************************************************
* Callback for verification *
*/
static int
-verify_callback(int state, X509_STORE_CTX *x509ctx, BOOL client)
+verify_callback(int state, X509_STORE_CTX *x509ctx,
+ tls_support *tlsp, BOOL *calledp, BOOL *optionalp)
{
+X509 * cert = X509_STORE_CTX_get_current_cert(x509ctx);
static uschar txt[256];
-tls_support * tlsp;
-BOOL * calledp;
-BOOL * optionalp;
-if (client)
- {
- tlsp= &tls_out;
- calledp= &client_verify_callback_called;
- optionalp= &client_verify_optional;
- }
-else
- {
- tlsp= &tls_in;
- calledp= &server_verify_callback_called;
- optionalp= &server_verify_optional;
- }
-
-X509_NAME_oneline(X509_get_subject_name(x509ctx->current_cert),
- CS txt, sizeof(txt));
+X509_NAME_oneline(X509_get_subject_name(cert), CS txt, sizeof(txt));
if (state == 0)
{
log_write(0, LOG_MAIN, "SSL verify error: depth=%d error=%s cert=%s",
- x509ctx->error_depth,
- X509_verify_cert_error_string(x509ctx->error),
+ X509_STORE_CTX_get_error_depth(x509ctx),
+ X509_verify_cert_error_string(X509_STORE_CTX_get_error(x509ctx)),
txt);
tlsp->certificate_verified = FALSE;
*calledp = TRUE;
- if (!*optionalp) return 0; /* reject */
+ if (!*optionalp)
+ {
+ tlsp->peercert = X509_dup(cert);
+ return 0; /* reject */
+ }
DEBUG(D_tls) debug_printf("SSL verify failure overridden (host in "
"tls_try_verify_hosts)\n");
- return 1; /* accept */
}
-if (x509ctx->error_depth != 0)
+else if (X509_STORE_CTX_get_error_depth(x509ctx) != 0)
{
- DEBUG(D_tls) debug_printf("SSL verify ok: depth=%d cert=%s\n",
- x509ctx->error_depth, txt);
+ DEBUG(D_tls) debug_printf("SSL verify ok: depth=%d SN=%s\n",
+ X509_STORE_CTX_get_error_depth(x509ctx), txt);
+#ifndef DISABLE_OCSP
+ if (tlsp == &tls_out && client_static_cbinfo->u_ocsp.client.verify_store)
+ { /* client, wanting stapling */
+ /* Add the server cert's signing chain as the one
+ for the verification of the OCSP stapled information. */
+
+ if (!X509_STORE_add_cert(client_static_cbinfo->u_ocsp.client.verify_store,
+ cert))
+ ERR_clear_error();
+ }
+#endif
}
else
{
- DEBUG(D_tls) debug_printf("SSL%s peer: %s\n",
- *calledp ? "" : " authenticated", txt);
+#ifdef EXPERIMENTAL_CERTNAMES
+ uschar * verify_cert_hostnames;
+#endif
+
tlsp->peerdn = txt;
- }
+ tlsp->peercert = X509_dup(cert);
+
+#ifdef EXPERIMENTAL_CERTNAMES
+ if ( tlsp == &tls_out
+ && ((verify_cert_hostnames = client_static_cbinfo->verify_cert_hostnames)))
+ /* client, wanting hostname check */
+
+# if OPENSSL_VERSION_NUMBER >= 0x010100000L || OPENSSL_VERSION_NUMBER >= 0x010002000L
+# ifndef X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS
+# define X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS 0
+# endif
+ {
+ int sep = 0;
+ uschar * list = verify_cert_hostnames;
+ uschar * name;
+ int rc;
+ while ((name = string_nextinlist(&list, &sep, NULL, 0)))
+ if ((rc = X509_check_host(cert, name, 0,
+ X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)))
+ {
+ if (rc < 0)
+ {
+ log_write(0, LOG_MAIN, "SSL verify error: internal error\n");
+ name = NULL;
+ }
+ break;
+ }
+ if (!name)
+ {
+ log_write(0, LOG_MAIN,
+ "SSL verify error: certificate name mismatch: \"%s\"\n", txt);
+ return 0; /* reject */
+ }
+ }
+# else
+ if (!tls_is_name_for_cert(verify_cert_hostnames, cert))
+ {
+ log_write(0, LOG_MAIN,
+ "SSL verify error: certificate name mismatch: \"%s\"\n", txt);
+ return 0; /* reject */
+ }
+# endif
+#endif /*EXPERIMENTAL_CERTNAMES*/
-if (!*calledp) tlsp->certificate_verified = TRUE;
-*calledp = TRUE;
+ DEBUG(D_tls) debug_printf("SSL%s verify ok: depth=0 SN=%s\n",
+ *calledp ? "" : " authenticated", txt);
+ if (!*calledp) tlsp->certificate_verified = TRUE;
+ *calledp = TRUE;
+ }
return 1; /* accept */
}
static int
verify_callback_client(int state, X509_STORE_CTX *x509ctx)
{
-return verify_callback(state, x509ctx, TRUE);
+return verify_callback(state, x509ctx, &tls_out, &client_verify_callback_called, &client_verify_optional);
}
static int
verify_callback_server(int state, X509_STORE_CTX *x509ctx)
{
-return verify_callback(state, x509ctx, FALSE);
+return verify_callback(state, x509ctx, &tls_in, &server_verify_callback_called, &server_verify_optional);
}
+#ifdef EXPERIMENTAL_DANE
+/* This gets called *by* the dane library verify callback, which interposes
+itself.
+*/
+static int
+verify_callback_client_dane(int state, X509_STORE_CTX * x509ctx)
+{
+X509 * cert = X509_STORE_CTX_get_current_cert(x509ctx);
+static uschar txt[256];
+
+X509_NAME_oneline(X509_get_subject_name(cert), CS txt, sizeof(txt));
+
+DEBUG(D_tls) debug_printf("verify_callback_client_dane: %s\n", txt);
+tls_out.peerdn = txt;
+tls_out.peercert = X509_dup(cert);
+
+if (state == 1)
+ tls_out.certificate_verified = TRUE;
+return 1;
+}
+#endif
+
/*************************************************
* Information callback *
if (!expand_check(dhparam, US"tls_dhparam", &dhexpanded))
return FALSE;
-if (dhexpanded == NULL || *dhexpanded == '\0')
- {
+if (!dhexpanded || !*dhexpanded)
bio = BIO_new_mem_buf(CS std_dh_prime_default(), -1);
- }
else if (dhexpanded[0] == '/')
{
- bio = BIO_new_file(CS dhexpanded, "r");
- if (bio == NULL)
+ if (!(bio = BIO_new_file(CS dhexpanded, "r")))
{
tls_error(string_sprintf("could not read dhparams file %s", dhexpanded),
host, US strerror(errno));
return TRUE;
}
- pem = std_dh_prime_named(dhexpanded);
- if (!pem)
+ if (!(pem = std_dh_prime_named(dhexpanded)))
{
tls_error(string_sprintf("Unknown standard DH prime \"%s\"", dhexpanded),
host, US strerror(errno));
bio = BIO_new_mem_buf(CS pem, -1);
}
-dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
-if (dh == NULL)
+if (!(dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL)))
{
BIO_free(bio);
tls_error(string_sprintf("Could not read tls_dhparams \"%s\"", dhexpanded),
-#ifdef EXPERIMENTAL_OCSP
+#ifndef DISABLE_OCSP
/*************************************************
* Load OCSP information into state *
*************************************************/
-/* Called to load the OCSP response from the given file into memory, once
+/* Called to load the server OCSP response from the given file into memory, once
caller has determined this is needed. Checks validity. Debugs a message
if invalid.
*/
static void
-ocsp_load_response(SSL_CTX *sctx,
- tls_ext_ctx_cb *cbinfo,
- const uschar *expanded)
+ocsp_load_response(SSL_CTX *sctx, tls_ext_ctx_cb *cbinfo, const uschar *expanded)
{
BIO *bio;
OCSP_RESPONSE *resp;
unsigned long verify_flags;
int status, reason, i;
-cbinfo->ocsp_file_expanded = string_copy(expanded);
-if (cbinfo->ocsp_response)
+cbinfo->u_ocsp.server.file_expanded = string_copy(expanded);
+if (cbinfo->u_ocsp.server.response)
{
- OCSP_RESPONSE_free(cbinfo->ocsp_response);
- cbinfo->ocsp_response = NULL;
+ OCSP_RESPONSE_free(cbinfo->u_ocsp.server.response);
+ cbinfo->u_ocsp.server.response = NULL;
}
-bio = BIO_new_file(CS cbinfo->ocsp_file_expanded, "rb");
+bio = BIO_new_file(CS cbinfo->u_ocsp.server.file_expanded, "rb");
if (!bio)
{
DEBUG(D_tls) debug_printf("Failed to open OCSP response file \"%s\"\n",
- cbinfo->ocsp_file_expanded);
+ cbinfo->u_ocsp.server.file_expanded);
return;
}
{
DEBUG(D_tls) debug_printf("OCSP response not valid: %s (%d)\n",
OCSP_response_status_str(status), status);
- return;
+ goto bad;
}
basic_response = OCSP_response_get1_basic(resp);
{
DEBUG(D_tls)
debug_printf("OCSP response parse error: unable to extract basic response.\n");
- return;
+ goto bad;
}
store = SSL_CTX_get_cert_store(sctx);
DEBUG(D_tls) {
ERR_error_string(ERR_get_error(), ssl_errstring);
debug_printf("OCSP response verify failure: %s\n", US ssl_errstring);
- }
- return;
+ }
+ goto bad;
}
/* Here's the simplifying assumption: there's only one response, for the
{
DEBUG(D_tls)
debug_printf("Unable to get first response from OCSP basic response.\n");
- return;
+ goto bad;
}
status = OCSP_single_get0_status(single_response, &reason, &rev, &thisupd, &nextupd);
-/* how does this status differ from the one above? */
-if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL)
+if (status != V_OCSP_CERTSTATUS_GOOD)
{
- DEBUG(D_tls) debug_printf("OCSP response not valid (take 2): %s (%d)\n",
- OCSP_response_status_str(status), status);
- return;
+ DEBUG(D_tls) debug_printf("OCSP response bad cert status: %s (%d) %s (%d)\n",
+ OCSP_cert_status_str(status), status,
+ OCSP_crl_reason_str(reason), reason);
+ goto bad;
}
if (!OCSP_check_validity(thisupd, nextupd, EXIM_OCSP_SKEW_SECONDS, EXIM_OCSP_MAX_AGE))
{
DEBUG(D_tls) debug_printf("OCSP status invalid times.\n");
- return;
+ goto bad;
}
-cbinfo->ocsp_response = resp;
+supply_response:
+ cbinfo->u_ocsp.server.response = resp;
+return;
+
+bad:
+ if (running_in_test_harness)
+ {
+ extern char ** environ;
+ uschar ** p;
+ for (p = USS environ; *p != NULL; p++)
+ if (Ustrncmp(*p, "EXIM_TESTHARNESS_DISABLE_OCSPVALIDITYCHECK", 42) == 0)
+ {
+ DEBUG(D_tls) debug_printf("Supplying known bad OCSP response\n");
+ goto supply_response;
+ }
+ }
+return;
}
-#endif
+#endif /*!DISABLE_OCSP*/
* Expand key and cert file specs *
*************************************************/
-/* Called once during tls_init and possibly againt during TLS setup, for a
+/* Called once during tls_init and possibly again during TLS setup, for a
new context, if Server Name Indication was used and tls_sni was seen in
the certificate string.
"SSL_CTX_use_PrivateKey_file file=%s", expanded), cbinfo->host, NULL);
}
-#ifdef EXPERIMENTAL_OCSP
-if (cbinfo->ocsp_file != NULL)
+#ifndef DISABLE_OCSP
+if (cbinfo->is_server && cbinfo->u_ocsp.server.file != NULL)
{
- if (!expand_check(cbinfo->ocsp_file, US"tls_ocsp_file", &expanded))
+ if (!expand_check(cbinfo->u_ocsp.server.file, US"tls_ocsp_file", &expanded))
return DEFER;
if (expanded != NULL && *expanded != 0)
{
DEBUG(D_tls) debug_printf("tls_ocsp_file %s\n", expanded);
- if (cbinfo->ocsp_file_expanded &&
- (Ustrcmp(expanded, cbinfo->ocsp_file_expanded) == 0))
+ if (cbinfo->u_ocsp.server.file_expanded &&
+ (Ustrcmp(expanded, cbinfo->u_ocsp.server.file_expanded) == 0))
{
DEBUG(D_tls)
debug_printf("tls_ocsp_file value unchanged, using existing values.\n");
not confident that memcpy wouldn't break some internal reference counting.
Especially since there's a references struct member, which would be off. */
-server_sni = SSL_CTX_new(SSLv23_server_method());
-if (!server_sni)
+if (!(server_sni = SSL_CTX_new(SSLv23_server_method())))
{
ERR_error_string(ERR_get_error(), ssl_errstring);
DEBUG(D_tls) debug_printf("SSL_CTX_new() failed: %s\n", ssl_errstring);
SSL_CTX_set_tlsext_servername_arg(server_sni, cbinfo);
if (cbinfo->server_cipher_list)
SSL_CTX_set_cipher_list(server_sni, CS cbinfo->server_cipher_list);
-#ifdef EXPERIMENTAL_OCSP
-if (cbinfo->ocsp_file)
+#ifndef DISABLE_OCSP
+if (cbinfo->u_ocsp.server.file)
{
- SSL_CTX_set_tlsext_status_cb(server_sni, tls_stapling_cb);
+ SSL_CTX_set_tlsext_status_cb(server_sni, tls_server_stapling_cb);
SSL_CTX_set_tlsext_status_arg(server_sni, cbinfo);
}
#endif
-rc = setup_certs(server_sni, tls_verify_certificates, tls_crl, NULL, FALSE, FALSE);
+rc = setup_certs(server_sni, tls_verify_certificates, tls_crl, NULL, FALSE, verify_callback_server);
if (rc != OK) return SSL_TLSEXT_ERR_NOACK;
/* do this after setup_certs, because this can require the certs for verifying
rc = tls_expand_session_files(server_sni, cbinfo);
if (rc != OK) return SSL_TLSEXT_ERR_NOACK;
-rc = init_dh(server_sni, cbinfo->dhparam, NULL);
-if (rc != OK) return SSL_TLSEXT_ERR_NOACK;
+if (!init_dh(server_sni, cbinfo->dhparam, NULL))
+ return SSL_TLSEXT_ERR_NOACK;
DEBUG(D_tls) debug_printf("Switching SSL context.\n");
SSL_set_SSL_CTX(s, server_sni);
-#ifdef EXPERIMENTAL_OCSP
+#ifndef DISABLE_OCSP
+
/*************************************************
* Callback to handle OCSP Stapling *
*************************************************/
*/
static int
-tls_stapling_cb(SSL *s, void *arg)
+tls_server_stapling_cb(SSL *s, void *arg)
{
const tls_ext_ctx_cb *cbinfo = (tls_ext_ctx_cb *) arg;
uschar *response_der;
int response_der_len;
-DEBUG(D_tls) debug_printf("Received TLS status request (OCSP stapling); %s response.\n",
- cbinfo->ocsp_response ? "have" : "lack");
-if (!cbinfo->ocsp_response)
+DEBUG(D_tls)
+ debug_printf("Received TLS status request (OCSP stapling); %s response.",
+ cbinfo->u_ocsp.server.response ? "have" : "lack");
+
+tls_in.ocsp = OCSP_NOT_RESP;
+if (!cbinfo->u_ocsp.server.response)
return SSL_TLSEXT_ERR_NOACK;
response_der = NULL;
-response_der_len = i2d_OCSP_RESPONSE(cbinfo->ocsp_response, &response_der);
+response_der_len = i2d_OCSP_RESPONSE(cbinfo->u_ocsp.server.response,
+ &response_der);
if (response_der_len <= 0)
return SSL_TLSEXT_ERR_NOACK;
SSL_set_tlsext_status_ocsp_resp(server_ssl, response_der, response_der_len);
+tls_in.ocsp = OCSP_VFIED;
return SSL_TLSEXT_ERR_OK;
}
-#endif /* EXPERIMENTAL_OCSP */
+static void
+time_print(BIO * bp, const char * str, ASN1_GENERALIZEDTIME * time)
+{
+BIO_printf(bp, "\t%s: ", str);
+ASN1_GENERALIZEDTIME_print(bp, time);
+BIO_puts(bp, "\n");
+}
+
+static int
+tls_client_stapling_cb(SSL *s, void *arg)
+{
+tls_ext_ctx_cb * cbinfo = arg;
+const unsigned char * p;
+int len;
+OCSP_RESPONSE * rsp;
+OCSP_BASICRESP * bs;
+int i;
+
+DEBUG(D_tls) debug_printf("Received TLS status response (OCSP stapling):");
+len = SSL_get_tlsext_status_ocsp_resp(s, &p);
+if(!p)
+ {
+ /* Expect this when we requested ocsp but got none */
+ if ( cbinfo->u_ocsp.client.verify_required
+ && log_extra_selector & LX_tls_cipher)
+ log_write(0, LOG_MAIN, "Received TLS status callback, null content");
+ else
+ DEBUG(D_tls) debug_printf(" null\n");
+ return cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ }
+
+if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len)))
+ {
+ tls_out.ocsp = OCSP_FAILED;
+ if (log_extra_selector & LX_tls_cipher)
+ log_write(0, LOG_MAIN, "Received TLS status response, parse error");
+ else
+ DEBUG(D_tls) debug_printf(" parse error\n");
+ return 0;
+ }
+
+if(!(bs = OCSP_response_get1_basic(rsp)))
+ {
+ tls_out.ocsp = OCSP_FAILED;
+ if (log_extra_selector & LX_tls_cipher)
+ log_write(0, LOG_MAIN, "Received TLS status response, error parsing response");
+ else
+ DEBUG(D_tls) debug_printf(" error parsing response\n");
+ OCSP_RESPONSE_free(rsp);
+ return 0;
+ }
+
+/* We'd check the nonce here if we'd put one in the request. */
+/* However that would defeat cacheability on the server so we don't. */
+
+/* This section of code reworked from OpenSSL apps source;
+ The OpenSSL Project retains copyright:
+ Copyright (c) 1999 The OpenSSL Project. All rights reserved.
+*/
+ {
+ BIO * bp = NULL;
+ int status, reason;
+ ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
+
+ DEBUG(D_tls) bp = BIO_new_fp(stderr, BIO_NOCLOSE);
+
+ /*OCSP_RESPONSE_print(bp, rsp, 0); extreme debug: stapling content */
+
+ /* Use the chain that verified the server cert to verify the stapled info */
+ /* DEBUG(D_tls) x509_store_dump_cert_s_names(cbinfo->u_ocsp.client.verify_store); */
+
+ if ((i = OCSP_basic_verify(bs, NULL,
+ cbinfo->u_ocsp.client.verify_store, 0)) <= 0)
+ {
+ tls_out.ocsp = OCSP_FAILED;
+ BIO_printf(bp, "OCSP response verify failure\n");
+ ERR_print_errors(bp);
+ i = cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ goto out;
+ }
+
+ BIO_printf(bp, "OCSP response well-formed and signed OK\n");
+
+ {
+ STACK_OF(OCSP_SINGLERESP) * sresp = bs->tbsResponseData->responses;
+ OCSP_SINGLERESP * single;
+
+ if (sk_OCSP_SINGLERESP_num(sresp) != 1)
+ {
+ tls_out.ocsp = OCSP_FAILED;
+ log_write(0, LOG_MAIN, "OCSP stapling "
+ "with multiple responses not handled");
+ i = cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ goto out;
+ }
+ single = OCSP_resp_get0(bs, 0);
+ status = OCSP_single_get0_status(single, &reason, &rev,
+ &thisupd, &nextupd);
+ }
+
+ DEBUG(D_tls) time_print(bp, "This OCSP Update", thisupd);
+ DEBUG(D_tls) if(nextupd) time_print(bp, "Next OCSP Update", nextupd);
+ if (!OCSP_check_validity(thisupd, nextupd,
+ EXIM_OCSP_SKEW_SECONDS, EXIM_OCSP_MAX_AGE))
+ {
+ tls_out.ocsp = OCSP_FAILED;
+ DEBUG(D_tls) ERR_print_errors(bp);
+ log_write(0, LOG_MAIN, "Server OSCP dates invalid");
+ i = cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ }
+ else
+ {
+ DEBUG(D_tls) BIO_printf(bp, "Certificate status: %s\n",
+ OCSP_cert_status_str(status));
+ switch(status)
+ {
+ case V_OCSP_CERTSTATUS_GOOD:
+ tls_out.ocsp = OCSP_VFIED;
+ i = 1;
+ break;
+ case V_OCSP_CERTSTATUS_REVOKED:
+ tls_out.ocsp = OCSP_FAILED;
+ log_write(0, LOG_MAIN, "Server certificate revoked%s%s",
+ reason != -1 ? "; reason: " : "",
+ reason != -1 ? OCSP_crl_reason_str(reason) : "");
+ DEBUG(D_tls) time_print(bp, "Revocation Time", rev);
+ i = cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ break;
+ default:
+ tls_out.ocsp = OCSP_FAILED;
+ log_write(0, LOG_MAIN,
+ "Server certificate status unknown, in OCSP stapling");
+ i = cbinfo->u_ocsp.client.verify_required ? 0 : 1;
+ break;
+ }
+ }
+ out:
+ BIO_free(bp);
+ }
+OCSP_RESPONSE_free(rsp);
+return i;
+}
+#endif /*!DISABLE_OCSP*/
/*************************************************
* Initialize for TLS *
*************************************************/
-/* Called from both server and client code, to do preliminary initialization of
-the library.
+/* Called from both server and client code, to do preliminary initialization
+of the library. We allocate and return a context structure.
Arguments:
+ ctxp returned SSL context
host connected host, if client; NULL if server
dhparam DH parameter file
certificate certificate file
privatekey private key
+ ocsp_file file of stapling info (server); flag for require ocsp (client)
addr address if client; NULL if server (for some randomness)
+ cbp place to put allocated callback context
Returns: OK/DEFER/FAIL
*/
static int
tls_init(SSL_CTX **ctxp, host_item *host, uschar *dhparam, uschar *certificate,
uschar *privatekey,
-#ifdef EXPERIMENTAL_OCSP
+#ifndef DISABLE_OCSP
uschar *ocsp_file,
#endif
address_item *addr, tls_ext_ctx_cb ** cbp)
cbinfo = store_malloc(sizeof(tls_ext_ctx_cb));
cbinfo->certificate = certificate;
cbinfo->privatekey = privatekey;
-#ifdef EXPERIMENTAL_OCSP
-cbinfo->ocsp_file = ocsp_file;
-cbinfo->ocsp_file_expanded = NULL;
-cbinfo->ocsp_response = NULL;
+#ifndef DISABLE_OCSP
+if ((cbinfo->is_server = host==NULL))
+ {
+ cbinfo->u_ocsp.server.file = ocsp_file;
+ cbinfo->u_ocsp.server.file_expanded = NULL;
+ cbinfo->u_ocsp.server.response = NULL;
+ }
+else
+ cbinfo->u_ocsp.client.verify_store = NULL;
#endif
cbinfo->dhparam = dhparam;
+cbinfo->server_cipher_list = NULL;
cbinfo->host = host;
SSL_load_error_strings(); /* basic set up */
/* If we need to handle SNI, do so */
#ifdef EXIM_HAVE_OPENSSL_TLSEXT
-if (host == NULL)
+if (host == NULL) /* server */
{
-#ifdef EXPERIMENTAL_OCSP
- /* We check ocsp_file, not ocsp_response, because we care about if
+# ifndef DISABLE_OCSP
+ /* We check u_ocsp.server.file, not server.response, because we care about if
the option exists, not what the current expansion might be, as SNI might
change the certificate and OCSP file in use between now and the time the
callback is invoked. */
- if (cbinfo->ocsp_file)
+ if (cbinfo->u_ocsp.server.file)
{
- SSL_CTX_set_tlsext_status_cb(server_ctx, tls_stapling_cb);
+ SSL_CTX_set_tlsext_status_cb(server_ctx, tls_server_stapling_cb);
SSL_CTX_set_tlsext_status_arg(server_ctx, cbinfo);
}
-#endif
+# endif
/* We always do this, so that $tls_sni is available even if not used in
tls_certificate */
SSL_CTX_set_tlsext_servername_callback(*ctxp, tls_servername_cb);
SSL_CTX_set_tlsext_servername_arg(*ctxp, cbinfo);
}
+# ifndef DISABLE_OCSP
+else /* client */
+ if(ocsp_file) /* wanting stapling */
+ {
+ if (!(cbinfo->u_ocsp.client.verify_store = X509_STORE_new()))
+ {
+ DEBUG(D_tls) debug_printf("failed to create store for stapling verify\n");
+ return FAIL;
+ }
+ SSL_CTX_set_tlsext_status_cb(*ctxp, tls_client_stapling_cb);
+ SSL_CTX_set_tlsext_status_arg(*ctxp, cbinfo);
+ }
+# endif
+#endif
+
+#ifdef EXPERIMENTAL_CERTNAMES
+cbinfo->verify_cert_hostnames = NULL;
#endif
/* Set up the RSA callback */
yet reflect that. It should be a safe change anyway, even 0.9.8 versions have
the accessor functions use const in the prototype. */
const SSL_CIPHER *c;
-uschar *ver;
-
-switch (ssl->session->ssl_version)
- {
- case SSL2_VERSION:
- ver = US"SSLv2";
- break;
-
- case SSL3_VERSION:
- ver = US"SSLv3";
- break;
+const uschar *ver;
- case TLS1_VERSION:
- ver = US"TLSv1";
- break;
-
-#ifdef TLS1_1_VERSION
- case TLS1_1_VERSION:
- ver = US"TLSv1.1";
- break;
-#endif
-
-#ifdef TLS1_2_VERSION
- case TLS1_2_VERSION:
- ver = US"TLSv1.2";
- break;
-#endif
-
- default:
- ver = US"UNKNOWN";
- }
+ver = (const uschar *)SSL_get_version(ssl);
c = (const SSL_CIPHER *) SSL_get_current_cipher(ssl);
SSL_CIPHER_get_bits(c, bits);
host NULL in a server; the remote host in a client
optional TRUE if called from a server for a host in tls_try_verify_hosts;
otherwise passed as FALSE
- client TRUE if called for client startup, FALSE for server startup
+ cert_vfy_cb Callback function for certificate verification
Returns: OK/DEFER/FAIL
*/
static int
-setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional, BOOL client)
+setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional,
+ int (*cert_vfy_cb)(int, X509_STORE_CTX *) )
{
uschar *expcerts, *expcrl;
if (!expand_check(certs, US"tls_verify_certificates", &expcerts))
return DEFER;
-if (expcerts != NULL)
+if (expcerts != NULL && *expcerts != '\0')
{
struct stat statbuf;
if (!SSL_CTX_set_default_verify_paths(sctx))
SSL_CTX_set_verify(sctx,
SSL_VERIFY_PEER | (optional? 0 : SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
- client ? verify_callback_client : verify_callback_server);
+ cert_vfy_cb);
}
return OK;
the error. */
rc = tls_init(&server_ctx, NULL, tls_dhparam, tls_certificate, tls_privatekey,
-#ifdef EXPERIMENTAL_OCSP
+#ifndef DISABLE_OCSP
tls_ocsp_file,
#endif
NULL, &server_static_cbinfo);
if (verify_check_host(&tls_verify_hosts) == OK)
{
- rc = setup_certs(server_ctx, tls_verify_certificates, tls_crl, NULL, FALSE, FALSE);
+ rc = setup_certs(server_ctx, tls_verify_certificates, tls_crl, NULL,
+ FALSE, verify_callback_server);
if (rc != OK) return rc;
server_verify_optional = FALSE;
}
else if (verify_check_host(&tls_try_verify_hosts) == OK)
{
- rc = setup_certs(server_ctx, tls_verify_certificates, tls_crl, NULL, TRUE, FALSE);
+ rc = setup_certs(server_ctx, tls_verify_certificates, tls_crl, NULL,
+ TRUE, verify_callback_server);
if (rc != OK) return rc;
server_verify_optional = TRUE;
}
debug_printf("Shared ciphers: %s\n", buf);
}
+/* Record the certificate we presented */
+ {
+ X509 * crt = SSL_get_certificate(server_ssl);
+ tls_in.ourcert = crt ? X509_dup(crt) : NULL;
+ }
/* Only used by the server-side tls (tls_in), including tls_getc.
Client-side (tls_out) reads (seem to?) go via
+static int
+tls_client_basic_ctx_init(SSL_CTX * ctx,
+ host_item * host, smtp_transport_options_block * ob
+#ifdef EXPERIMENTAL_CERTNAMES
+ , tls_ext_ctx_cb * cbinfo
+#endif
+ )
+{
+int rc;
+/* stick to the old behaviour for compatibility if tls_verify_certificates is
+ set but both tls_verify_hosts and tls_try_verify_hosts is not set. Check only
+ the specified host patterns if one of them is defined */
+
+if ((!ob->tls_verify_hosts && !ob->tls_try_verify_hosts) ||
+ (verify_check_host(&ob->tls_verify_hosts) == OK))
+ {
+ if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
+ ob->tls_crl, host, FALSE, verify_callback_client)) != OK)
+ return rc;
+ client_verify_optional = FALSE;
+
+#ifdef EXPERIMENTAL_CERTNAMES
+ if (ob->tls_verify_cert_hostnames)
+ {
+ if (!expand_check(ob->tls_verify_cert_hostnames,
+ US"tls_verify_cert_hostnames",
+ &cbinfo->verify_cert_hostnames))
+ return FAIL;
+ if (cbinfo->verify_cert_hostnames)
+ DEBUG(D_tls) debug_printf("Cert hostname to check: \"%s\"\n",
+ cbinfo->verify_cert_hostnames);
+ }
+#endif
+ }
+else if (verify_check_host(&ob->tls_try_verify_hosts) == OK)
+ {
+ if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
+ ob->tls_crl, host, TRUE, verify_callback_client)) != OK)
+ return rc;
+ client_verify_optional = TRUE;
+ }
+
+return OK;
+}
/*************************************************
* Start a TLS session in a client *
fd the fd of the connection
host connected host (for messages)
addr the first address
- dhparam DH parameter file
- certificate certificate file
- privatekey private key file
- sni TLS SNI to send to remote host
- verify_certs file for certificate verify
- crl file containing CRL
- require_ciphers list of allowed ciphers
- dh_min_bits minimum number of bits acceptable in server's DH prime
- (unused in OpenSSL)
- timeout startup timeout
+ ob smtp transport options
Returns: OK on success
FAIL otherwise - note that tls_error() will not give DEFER
*/
int
-tls_client_start(int fd, host_item *host, address_item *addr, uschar *dhparam,
- uschar *certificate, uschar *privatekey, uschar *sni,
- uschar *verify_certs, uschar *crl,
- uschar *require_ciphers, int dh_min_bits ARG_UNUSED, int timeout)
+tls_client_start(int fd, host_item *host, address_item *addr,
+ void *v_ob)
{
+smtp_transport_options_block * ob = v_ob;
static uschar txt[256];
-uschar *expciphers;
-X509* server_cert;
+uschar * expciphers;
+X509 * server_cert;
int rc;
static uschar cipherbuf[256];
-rc = tls_init(&client_ctx, host, dhparam, certificate, privatekey,
-#ifdef EXPERIMENTAL_OCSP
- NULL,
+#ifndef DISABLE_OCSP
+BOOL request_ocsp = FALSE;
+BOOL require_ocsp = FALSE;
+#endif
+#ifdef EXPERIMENTAL_DANE
+dns_answer tlsa_dnsa;
+BOOL dane = FALSE;
+BOOL dane_required;
+#endif
+
+#ifdef EXPERIMENTAL_DANE
+dane_required = verify_check_this_host(&ob->hosts_require_dane, NULL,
+ host->name, host->address, NULL) == OK;
+
+if (host->dnssec == DS_YES)
+ {
+ if( dane_required
+ || verify_check_this_host(&ob->hosts_try_dane, NULL,
+ host->name, host->address, NULL) == OK
+ )
+ {
+ /* move this out to host.c given the similarity to dns_lookup() ? */
+ uschar buffer[300];
+ uschar * fullname = buffer;
+
+ /* TLSA lookup string */
+ (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port,
+ host->name);
+
+ switch (rc = dns_lookup(&tlsa_dnsa, buffer, T_TLSA, &fullname))
+ {
+ case DNS_AGAIN:
+ return DEFER; /* just defer this TLS'd conn */
+
+ default:
+ case DNS_FAIL:
+ if (dane_required)
+ {
+ log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
+ return FAIL;
+ }
+ break;
+
+ case DNS_SUCCEED:
+ if (!dns_is_secure(&tlsa_dnsa))
+ {
+ log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
+ return DEFER;
+ }
+ dane = TRUE;
+ break;
+ }
+ }
+ }
+else if (dane_required)
+ {
+ /*XXX a shame we only find this after making tcp & smtp connection */
+ /* move the test earlier? */
+ log_write(0, LOG_MAIN, "DANE error: previous lookup not DNSSEC");
+ return FAIL;
+ }
+
+if (!dane) /*XXX todo: enable ocsp with dane */
+#endif
+
+#ifndef DISABLE_OCSP
+ {
+ require_ocsp = verify_check_this_host(&ob->hosts_require_ocsp,
+ NULL, host->name, host->address, NULL) == OK;
+ request_ocsp = require_ocsp ? TRUE
+ : verify_check_this_host(&ob->hosts_request_ocsp,
+ NULL, host->name, host->address, NULL) == OK;
+ }
+#endif
+
+rc = tls_init(&client_ctx, host, NULL,
+ ob->tls_certificate, ob->tls_privatekey,
+#ifndef DISABLE_OCSP
+ (void *)(long)request_ocsp,
#endif
addr, &client_static_cbinfo);
if (rc != OK) return rc;
tls_out.certificate_verified = FALSE;
client_verify_callback_called = FALSE;
-if (!expand_check(require_ciphers, US"tls_require_ciphers", &expciphers))
+if (!expand_check(ob->tls_require_ciphers, US"tls_require_ciphers",
+ &expciphers))
return FAIL;
/* In OpenSSL, cipher components are separated by hyphens. In GnuTLS, they
return tls_error(US"SSL_CTX_set_cipher_list", host, NULL);
}
-rc = setup_certs(client_ctx, verify_certs, crl, host, FALSE, TRUE);
-if (rc != OK) return rc;
+#ifdef EXPERIMENTAL_DANE
+if (dane)
+ {
+ SSL_CTX_set_verify(client_ctx, SSL_VERIFY_PEER, verify_callback_client_dane);
-if ((client_ssl = SSL_new(client_ctx)) == NULL) return tls_error(US"SSL_new", host, NULL);
+ if (!DANESSL_library_init())
+ return tls_error(US"library init", host, NULL);
+ if (DANESSL_CTX_init(client_ctx) <= 0)
+ return tls_error(US"context init", host, NULL);
+ }
+else
+
+#endif
+
+ if ((rc = tls_client_basic_ctx_init(client_ctx, host, ob
+#ifdef EXPERIMENTAL_CERTNAMES
+ , client_static_cbinfo
+#endif
+ )) != OK)
+ return rc;
+
+if ((client_ssl = SSL_new(client_ctx)) == NULL)
+ return tls_error(US"SSL_new", host, NULL);
SSL_set_session_id_context(client_ssl, sid_ctx, Ustrlen(sid_ctx));
SSL_set_fd(client_ssl, fd);
SSL_set_connect_state(client_ssl);
-if (sni)
+if (ob->tls_sni)
{
- if (!expand_check(sni, US"tls_sni", &tls_out.sni))
+ if (!expand_check(ob->tls_sni, US"tls_sni", &tls_out.sni))
return FAIL;
if (tls_out.sni == NULL)
{
#else
DEBUG(D_tls)
debug_printf("OpenSSL at build-time lacked SNI support, ignoring \"%s\"\n",
- tls_sni);
+ tls_out.sni);
#endif
}
}
+#ifndef DISABLE_OCSP
+/* Request certificate status at connection-time. If the server
+does OCSP stapling we will get the callback (set in tls_init()) */
+if (request_ocsp)
+ {
+ SSL_set_tlsext_status_type(client_ssl, TLSEXT_STATUSTYPE_ocsp);
+ client_static_cbinfo->u_ocsp.client.verify_required = require_ocsp;
+ tls_out.ocsp = OCSP_NOT_RESP;
+ }
+#endif
+
+#ifdef EXPERIMENTAL_DANE
+if (dane)
+ {
+ dns_record * rr;
+ dns_scan dnss;
+ uschar * hostnames[2] = { host->name, NULL };
+
+ if (DANESSL_init(client_ssl, NULL, hostnames) != 1)
+ return tls_error(US"hostnames load", host, NULL);
+
+ for (rr = dns_next_rr(&tlsa_dnsa, &dnss, RESET_ANSWERS);
+ rr;
+ rr = dns_next_rr(&tlsa_dnsa, &dnss, RESET_NEXT)
+ ) if (rr->type == T_TLSA)
+ {
+ uschar * p = rr->data;
+ int usage, selector, mtype;
+ const char * mdname;
+
+ GETSHORT(usage, p);
+ GETSHORT(selector, p);
+ GETSHORT(mtype, p);
+
+ switch (mtype)
+ {
+ default: /* log bad */ return FAIL;
+ case 0: mdname = NULL; break;
+ case 1: mdname = "sha256"; break;
+ case 2: mdname = "sha512"; break;
+ }
+
+ switch (DANESSL_add_tlsa(client_ssl,
+ (uint8_t) usage, (uint8_t) selector,
+ mdname, p, rr->size - (p - rr->data)))
+ {
+ default:
+ case 0: /* action not taken */
+ return tls_error(US"tlsa load", host, NULL);
+ case 1: break;
+ }
+ }
+ }
+#endif
+
+
/* There doesn't seem to be a built-in timeout on connection. */
DEBUG(D_tls) debug_printf("Calling SSL_connect\n");
sigalrm_seen = FALSE;
-alarm(timeout);
+alarm(ob->command_timeout);
rc = SSL_connect(client_ssl);
alarm(0);
+#ifdef EXPERIMENTAL_DANE
+if (dane)
+ DANESSL_cleanup(client_ssl); /*XXX earliest possible callpoint. Too early? */
+#endif
+
if (rc <= 0)
return tls_error(US"SSL_connect", host, sigalrm_seen ? US"timed out" : NULL);
DEBUG(D_tls) debug_printf("SSL_connect succeeded\n");
/* Beware anonymous ciphers which lead to server_cert being NULL */
+/*XXX server_cert is never freed... use X509_free() */
server_cert = SSL_get_peer_certificate (client_ssl);
if (server_cert)
{
tls_out.peerdn = US X509_NAME_oneline(X509_get_subject_name(server_cert),
CS txt, sizeof(txt));
- tls_out.peerdn = txt;
+ tls_out.peerdn = txt; /*XXX a static buffer... */
}
else
tls_out.peerdn = NULL;
construct_cipher_name(client_ssl, cipherbuf, sizeof(cipherbuf), &tls_out.bits);
tls_out.cipher = cipherbuf;
+/* Record the certificate we presented */
+ {
+ X509 * crt = SSL_get_certificate(client_ssl);
+ tls_out.ourcert = crt ? X509_dup(crt) : NULL;
+ }
+
tls_out.active = fd;
return OK;
}
it can result in serious failures, including crashing with a SIGSEGV. So
report the version found by the compiler and the run-time version.
+Note: some OS vendors backport security fixes without changing the version
+number/string, and the version date remains unchanged. The _build_ date
+will change, so we can more usefully assist with version diagnosis by also
+reporting the build date.
+
Arguments: a FILE* to print the results to
Returns: nothing
*/
tls_version_report(FILE *f)
{
fprintf(f, "Library version: OpenSSL: Compile: %s\n"
- " Runtime: %s\n",
+ " Runtime: %s\n"
+ " : %s\n",
OPENSSL_VERSION_TEXT,
- SSLeay_version(SSLEAY_VERSION));
+ SSLeay_version(SSLEAY_VERSION),
+ SSLeay_version(SSLEAY_BUILT_ON));
+/* third line is 38 characters for the %s and the line is 73 chars long;
+the OpenSSL output includes a "built on: " prefix already. */
}
{
unsigned int r;
int i, needed_len;
+static pid_t pidlast = 0;
+pid_t pidnow;
uschar *p;
uschar smallbuf[sizeof(r)];
if (max <= 1)
return 0;
+pidnow = getpid();
+if (pidnow != pidlast)
+ {
+ /* Although OpenSSL documents that "OpenSSL makes sure that the PRNG state
+ is unique for each thread", this doesn't apparently apply across processes,
+ so our own warning from vaguely_random_number_fallback() applies here too.
+ Fix per PostgreSQL. */
+ if (pidlast != 0)
+ RAND_cleanup();
+ pidlast = pidnow;
+ }
+
/* OpenSSL auto-seeds from /dev/random, etc, but this a double-check. */
if (!RAND_status())
{
to apply.
This list is current as of:
- ==> 1.0.1b <== */
+ ==> 1.0.1b <==
+Plus SSL_OP_SAFARI_ECDHE_ECDSA_BUG from 2013-June patch/discussion on openssl-dev
+*/
static struct exim_openssl_option exim_openssl_options[] = {
/* KEEP SORTED ALPHABETICALLY! */
#ifdef SSL_OP_ALL
#ifdef SSL_OP_NO_TLSv1_2
{ US"no_tlsv1_2", SSL_OP_NO_TLSv1_2 },
#endif
+#ifdef SSL_OP_SAFARI_ECDHE_ECDSA_BUG
+ { US"safari_ecdhe_ecdsa_bug", SSL_OP_SAFARI_ECDHE_ECDSA_BUG },
+#endif
#ifdef SSL_OP_SINGLE_DH_USE
{ US"single_dh_use", SSL_OP_SINGLE_DH_USE },
#endif
return TRUE;
}
+/* vi: aw ai sw=2
+*/
/* End of tls-openssl.c */
projects / exim.git / blobdiff