/* needed to disable PKCS11 autoload unless requested */
#if GNUTLS_VERSION_NUMBER >= 0x020c00
# include <gnutls/pkcs11.h>
+# define SUPPORT_PARAM_TO_PK_BITS
#endif
#if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
# warning "GnuTLS library version too old; define DISABLE_OCSP in Makefile"
(void)close(fd);
return tls_error(US"TLS cache not a file", NULL, NULL);
}
- fp = fdopen(fd, "rb");
- if (!fp)
+ if (!(fp = fdopen(fd, "rb")))
{
saved_errno = errno;
(void)close(fd);
}
m.size = statbuf.st_size;
- m.data = malloc(m.size);
- if (m.data == NULL)
+ if (!(m.data = malloc(m.size)))
{
fclose(fp);
return tls_error(US"malloc failed", strerror(errno), NULL);
}
- sz = fread(m.data, m.size, 1, fp);
- if (!sz)
+ if (!(sz = fread(m.data, m.size, 1, fp)))
{
saved_errno = errno;
fclose(fp);
if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER)
exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3(NULL) sizing");
m.size = sz;
- m.data = malloc(m.size);
- if (m.data == NULL)
+ if (!(m.data = malloc(m.size)))
return tls_error(US"memory allocation failed", strerror(errno), NULL);
+
/* this will return a size 1 less than the allocation size above */
rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM,
m.data, &sz);
+/* Create and install a selfsigned certificate, for use in server mode */
+
+static int
+tls_install_selfsign(exim_gnutls_state_st * state)
+{
+gnutls_x509_crt_t cert = NULL;
+time_t now;
+gnutls_x509_privkey_t pkey = NULL;
+const uschar * where;
+int rc;
+
+where = US"initialising pkey";
+if ((rc = gnutls_x509_privkey_init(&pkey))) goto err;
+
+where = US"initialising cert";
+if ((rc = gnutls_x509_crt_init(&cert))) goto err;
+
+where = US"generating pkey";
+if ((rc = gnutls_x509_privkey_generate(pkey, GNUTLS_PK_RSA,
+#ifdef SUPPORT_PARAM_TO_PK_BITS
+ gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_LOW),
+#else
+ 1024,
+#endif
+ 0)))
+ goto err;
+
+where = US"configuring cert";
+now = 0;
+if ( (rc = gnutls_x509_crt_set_version(cert, 3))
+ || (rc = gnutls_x509_crt_set_serial(cert, &now, sizeof(now)))
+ || (rc = gnutls_x509_crt_set_activation_time(cert, now = time(NULL)))
+ || (rc = gnutls_x509_crt_set_expiration_time(cert, now + 60 * 60)) /* 1 hr */
+ || (rc = gnutls_x509_crt_set_key(cert, pkey))
+
+ || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+ GNUTLS_OID_X520_COUNTRY_NAME, 0, "UK", 2))
+ || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+ GNUTLS_OID_X520_ORGANIZATION_NAME, 0, "Exim Developers", 15))
+ || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+ GNUTLS_OID_X520_COMMON_NAME, 0,
+ smtp_active_hostname, Ustrlen(smtp_active_hostname)))
+ )
+ goto err;
+
+where = US"signing cert";
+if ((rc = gnutls_x509_crt_sign(cert, cert, pkey))) goto err;
+
+where = US"installing selfsign cert";
+ /* Since: 2.4.0 */
+if ((rc = gnutls_certificate_set_x509_key(state->x509_cred, &cert, 1, pkey)))
+ goto err;
+
+rc = OK;
+
+out:
+ if (cert) gnutls_x509_crt_deinit(cert);
+ if (pkey) gnutls_x509_privkey_deinit(pkey);
+ return rc;
+
+err:
+ rc = tls_error(where, gnutls_strerror(rc), NULL);
+ goto out;
+}
+
+
+
+
/*************************************************
* Variables re-expanded post-SNI *
*************************************************/
/* We check for tls_sni *before* expansion. */
if (!host) /* server */
- {
if (!state->received_sni)
{
if (state->tls_certificate &&
saved_tls_verify_certificates = state->exp_tls_verify_certificates;
saved_tls_crl = state->exp_tls_crl;
}
- }
rc = gnutls_certificate_allocate_credentials(&state->x509_cred);
exim_gnutls_err_check(US"gnutls_certificate_allocate_credentials");
/* certificate is mandatory in server, optional in client */
-if ((state->exp_tls_certificate == NULL) ||
- (*state->exp_tls_certificate == '\0'))
- {
+if ( !state->exp_tls_certificate
+ || !*state->exp_tls_certificate
+ )
if (!host)
- return tls_error(US"no TLS server certificate is specified", NULL, NULL);
+ return tls_install_selfsign(state);
else
DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n");
- }
if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey))
return DEFER;
state->exp_tls_certificate, state->exp_tls_privatekey);
if (state->received_sni)
- {
- if ((Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0) &&
- (Ustrcmp(state->exp_tls_privatekey, saved_tls_privatekey) == 0))
+ if ( Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0
+ && Ustrcmp(state->exp_tls_privatekey, saved_tls_privatekey) == 0
+ )
{
DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n");
}
{
DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n");
}
- }
rc = gnutls_certificate_set_x509_key_file(state->x509_cred,
CS state->exp_tls_certificate, CS state->exp_tls_privatekey,
but who knows if someone has some weird FIFO which always dumps some certs, or
other weirdness. The thing we really want to check is that it's not a
directory, since while OpenSSL supports that, GnuTLS does not.
- So s/!S_ISREG/S_ISDIR/ and change some messsaging ... */
+ So s/!S_ISREG/S_ISDIR/ and change some messaging ... */
if (S_ISDIR(statbuf.st_mode))
{
DEBUG(D_tls)
int sep = 0;
const uschar * list = state->exp_tls_verify_cert_hostnames;
uschar * name;
- while (name = string_nextinlist(&list, &sep, NULL, 0))
+ while ((name = string_nextinlist(&list, &sep, NULL, 0)))
if (gnutls_x509_crt_check_hostname(state->tlsp->peercert, CS name))
break;
if (!name)
sigalrm_seen = FALSE;
if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
do
- {
rc = gnutls_handshake(state->session);
- } while ((rc == GNUTLS_E_AGAIN) ||
- (rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen));
+while (rc == GNUTLS_E_AGAIN || rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen);
alarm(0);
if (rc != GNUTLS_E_SUCCESS)
{
- tls_error(US"gnutls_handshake",
- sigalrm_seen ? "timed out" : gnutls_strerror(rc), NULL);
/* It seems that, except in the case of a timeout, we have to close the
connection right here; otherwise if the other end is running OpenSSL it hangs
until the server times out. */
- if (!sigalrm_seen)
+ if (sigalrm_seen)
+ tls_error(US"gnutls_handshake", "timed out", NULL);
+ else
{
+ tls_error(US"gnutls_handshake", gnutls_strerror(rc), NULL);
+ gnutls_alert_send_appropriate(state->session, rc);
+ millisleep(500);
+ shutdown(fileno(smtp_out), SHUT_WR);
+ for (rc = 1024; fgetc(smtp_in) != EOF && rc > 0; ) rc--; /* drain skt */
(void)fclose(smtp_out);
(void)fclose(smtp_in);
+ smtp_out = smtp_in = NULL;
}
return FAIL;
/* Figure out peer DN, and if authenticated, etc. */
-rc = peer_status(state);
-if (rc != OK) return rc;
+if ((rc = peer_status(state)) != OK) return rc;
/* Sets various Exim expansion variables; always safe within server */
state->xfer_buffer = store_malloc(ssl_xfer_buffer_size);
receive_getc = tls_getc;
+receive_get_cache = tls_get_cache;
receive_ungetc = tls_ungetc;
receive_feof = tls_feof;
receive_ferror = tls_ferror;
alarm(0);
if (rc != GNUTLS_E_SUCCESS)
- return tls_error(US"gnutls_handshake",
- sigalrm_seen ? "timed out" : gnutls_strerror(rc), state->host);
+ if (sigalrm_seen)
+ {
+ gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_USER_CANCELED);
+ return tls_error(US"gnutls_handshake", "timed out", state->host);
+ }
+ else
+ return tls_error(US"gnutls_handshake", gnutls_strerror(rc), state->host);
DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n");
if (shutdown)
{
- DEBUG(D_tls) debug_printf("tls_close(): shutting down TLS\n");
+ DEBUG(D_tls) debug_printf("tls_close() from '%s': shutting down TLS\n");
gnutls_bye(state->session, GNUTLS_SHUT_WR);
}
ssl_xfer_buffer_size);
alarm(0);
- /* A zero-byte return appears to mean that the TLS session has been
+ /* Timeouts do not get this far; see command_timeout_handler().
+ A zero-byte return appears to mean that the TLS session has been
closed down, not that the socket itself has been closed down. Revert to
non-TLS handling. */
- if (inbytes == 0)
+ if (sigalrm_seen)
+ {
+ DEBUG(D_tls) debug_printf("Got tls read timeout\n");
+ state->xfer_error = 1;
+ return EOF;
+ }
+
+ else if (inbytes == 0)
{
DEBUG(D_tls) debug_printf("Got TLS_EOF\n");
receive_getc = smtp_getc;
+ receive_get_cache = smtp_get_cache;
receive_ungetc = smtp_ungetc;
receive_feof = smtp_feof;
receive_ferror = smtp_ferror;
return state->xfer_buffer[state->xfer_buffer_lwm++];
}
+void
+tls_get_cache()
+{
+#ifndef DISABLE_DKIM
+exim_gnutls_state_st * state = &state_server;
+int n = state->xfer_buffer_hwm - state->xfer_buffer_lwm;
+if (n > 0)
+ dkim_exim_verify_feed(state->xfer_buffer+state->xfer_buffer_lwm, n);
+#endif
+}
+
projects / exim.git / blobdiff