# ifdef SUPPORT_SRV_OCSP_STACK
builtin_macro_create(US"_HAVE_TLS_OCSP_LIST");
# endif
+#ifdef EXIM_HAVE_INOTIFY
+builtin_macro_create(US"_HAVE_TLS_CA_CACHE");
+# endif
}
#else
typedef struct exim_gnutls_state {
gnutls_session_t session;
- gnutls_certificate_credentials_t x509_cred;
- gnutls_priority_t priority_cache;
+
+ exim_tlslib_state lib_state;
+#define x509_cred libdata0
+#define pri_cache libdata1
+
enum peer_verify_requirement verify_requirement;
int fd_in;
int fd_out;
XXX But see gnutls_session_get_ptr()
*/
-static exim_gnutls_state_st state_server;
+static exim_gnutls_state_st state_server = {
+ /* all elements not explicitly intialised here get 0/NULL/FALSE */
+ .fd_in = -1,
+ .fd_out = -1,
+};
#ifndef GNUTLS_AUTO_DHPARAMS
/* dh_params are initialised once within the lifetime of a process using TLS;
# define EXIM_SERVER_DH_BITS_PRE2_12 1024
#endif
-#define expand_check_tlsvar(Varname, errstr) \
+#define Expand_check_tlsvar(Varname, errstr) \
expand_check(state->Varname, US #Varname, &state->exp_##Varname, errstr)
#if GNUTLS_VERSION_NUMBER >= 0x020c00
#endif
+/* ------------------------------------------------------------------------ */
+/* Initialisation */
+
+#ifndef DISABLE_OCSP
+
+static BOOL
+tls_is_buggy_ocsp(void)
+{
+const uschar * s;
+uschar maj, mid, mic;
+
+s = CUS gnutls_check_version(NULL);
+maj = atoi(CCS s);
+if (maj == 3)
+ {
+ while (*s && *s != '.') s++;
+ mid = atoi(CCS ++s);
+ if (mid <= 2)
+ return TRUE;
+ else if (mid >= 5)
+ return FALSE;
+ else
+ {
+ while (*s && *s != '.') s++;
+ mic = atoi(CCS ++s);
+ return mic <= (mid == 3 ? 16 : 3);
+ }
+ }
+return FALSE;
+}
+
+#endif
+
+
+static void
+tls_g_init(void)
+{
+DEBUG(D_tls) debug_printf("GnuTLS global init required\n");
+
+#if defined(HAVE_GNUTLS_PKCS11) && !defined(GNUTLS_AUTO_PKCS11_MANUAL)
+/* By default, gnutls_global_init will init PKCS11 support in auto mode,
+which loads modules from a config file, which sounds good and may be wanted
+by some sysadmin, but also means in common configurations that GNOME keyring
+environment variables are used and so breaks for users calling mailq.
+To prevent this, we init PKCS11 first, which is the documented approach. */
+
+if (!gnutls_allow_auto_pkcs11)
+ if ((rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL)))
+ return tls_error_gnu(US"gnutls_pkcs11_init", rc, host, errstr);
+#endif
+
+#ifndef GNUTLS_AUTO_GLOBAL_INIT
+if ((rc = gnutls_global_init()))
+ return tls_error_gnu(US"gnutls_global_init", rc, host, errstr);
+#endif
+
+#if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0
+DEBUG(D_tls)
+ {
+ gnutls_global_set_log_function(exim_gnutls_logger_cb);
+ /* arbitrarily chosen level; bump up to 9 for more */
+ gnutls_global_set_log_level(EXIM_GNUTLS_LIBRARY_LOG_LEVEL);
+ }
+#endif
+
+#ifndef DISABLE_OCSP
+if (tls_ocsp_file && (gnutls_buggy_ocsp = tls_is_buggy_ocsp()))
+ log_write(0, LOG_MAIN, "OCSP unusable with this GnuTLS library version");
+#endif
+
+exim_gnutls_base_init_done = TRUE;
+}
+
+
+
+/* Daemon-call before each connection. Nothing to do for GnuTLS. */
+
+static void
+tls_per_lib_daemon_tick(void)
+{
+}
+
/* Daemon one-time initialisation */
-void
-tls_daemon_init(void)
+
+static void
+tls_per_lib_daemon_init(void)
{
+static BOOL once = FALSE;
+
+if (!exim_gnutls_base_init_done)
+ tls_g_init();
+
+if (!once)
+ {
+ once = TRUE;
+
#ifdef EXIM_HAVE_TLS_RESUME
-/* We are dependent on the GnuTLS implementation of the Session Ticket
-encryption; both the strength and the key rotation period. We hope that
-the strength at least matches that of the ciphersuite (but GnuTLS does not
-document this). */
+ /* We are dependent on the GnuTLS implementation of the Session Ticket
+ encryption; both the strength and the key rotation period. We hope that
+ the strength at least matches that of the ciphersuite (but GnuTLS does not
+ document this). */
-static BOOL once = FALSE;
-if (once) return;
-once = TRUE;
-gnutls_session_ticket_key_generate(&server_sessticket_key); /* >= 2.10.0 */
-if (f.running_in_test_harness) ssl_session_timeout = 6;
+ gnutls_session_ticket_key_generate(&server_sessticket_key); /* >= 2.10.0 */
+ if (f.running_in_test_harness) ssl_session_timeout = 6;
#endif
+
+ tls_daemon_creds_reload();
+ }
}
/* ------------------------------------------------------------------------ */
/* peercert is set in peer_status() */
tlsp->peerdn = state->peerdn;
-tlsp->sni = state->received_sni;
+
+/* do not corrupt sni sent by client; record sni rxd by server */
+if (!state->host)
+ tlsp->sni = state->received_sni;
/* record our certificate */
{
BOOL use_file_in_spool = FALSE;
host_item *host = NULL; /* dummy for macros */
-DEBUG(D_tls) debug_printf("Initialising GnuTLS server params.\n");
+DEBUG(D_tls) debug_printf("Initialising GnuTLS server params\n");
if ((rc = gnutls_dh_params_init(&dh_server_params)))
return tls_error_gnu(US"gnutls_dh_params_init", rc, host, errstr);
use_file_in_spool = TRUE;
else if (Ustrcmp(exp_tls_dhparam, "none") == 0)
{
- DEBUG(D_tls) debug_printf("Requested no DH parameters.\n");
+ DEBUG(D_tls) debug_printf("Requested no DH parameters\n");
return OK;
}
else if (exp_tls_dhparam[0] != '/')
if (!(dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_NORMAL)))
return tls_error(US"gnutls_sec_param_to_pk_bits() failed", NULL, NULL, errstr);
DEBUG(D_tls)
- debug_printf("GnuTLS tells us that for D-H PK, NORMAL is %d bits.\n",
+ debug_printf("GnuTLS tells us that for D-H PK, NORMAL is %d bits\n",
dh_bits);
#else
dh_bits = EXIM_SERVER_DH_BITS_PRE2_12;
DEBUG(D_tls)
- debug_printf("GnuTLS lacks gnutls_sec_param_to_pk_bits(), using %d bits.\n",
+ debug_printf("GnuTLS lacks gnutls_sec_param_to_pk_bits(), using %d bits\n",
dh_bits);
#endif
if (dh_bits > tls_dh_max_bits)
{
DEBUG(D_tls)
- debug_printf("tls_dh_max_bits clamping override, using %d bits instead.\n",
+ debug_printf("tls_dh_max_bits clamping override, using %d bits instead\n",
tls_dh_max_bits);
dh_bits = tls_dh_max_bits;
}
where = US"installing selfsign cert";
/* Since: 2.4.0 */
-if ((rc = gnutls_certificate_set_x509_key(state->x509_cred, &cert, 1, pkey)))
+if ((rc = gnutls_certificate_set_x509_key(state->lib_state.x509_cred,
+ &cert, 1, pkey)))
goto err;
rc = OK;
static int
tls_add_certfile(exim_gnutls_state_st * state, const host_item * host,
- uschar * certfile, uschar * keyfile, uschar ** errstr)
+ const uschar * certfile, const uschar * keyfile, uschar ** errstr)
{
-int rc = gnutls_certificate_set_x509_key_file(state->x509_cred,
- CS certfile, CS keyfile, GNUTLS_X509_FMT_PEM);
+int rc = gnutls_certificate_set_x509_key_file(state->lib_state.x509_cred,
+ CCS certfile, CCS keyfile, GNUTLS_X509_FMT_PEM);
if (rc < 0)
return tls_error_gnu(
string_sprintf("cert/key setup: cert=%s key=%s", certfile, keyfile),
}
+# ifdef notdef_crashes
/* Make a note that we saw a status-response */
static int
tls_server_servercerts_ext(void * ctx, unsigned tls_id,
}
return 0;
}
+# endif
/* Callback for certificates packet, on server, if we think we might serve stapled-OCSP */
static int
unsigned when, unsigned int incoming, const gnutls_datum_t * msg)
{
/* Call fn for each extension seen. 3.6.3 onwards */
-#ifdef notdef
-/*XXX crashes */
+# ifdef notdef_crashes
+ /*XXX crashes */
return gnutls_ext_raw_parse(NULL, tls_server_servercerts_ext, msg, 0);
-#endif
+# endif
}
-#endif
+#endif /*SUPPORT_GNUTLS_EXT_RAW_PARSE*/
/*XXX in tls1.3 the cert-status travel as an extension next to the cert, in the
"Handshake Protocol: Certificate" record.
}
#endif
-/*************************************************
-* Variables re-expanded post-SNI *
-*************************************************/
-
-/* Called from both server and client code, via tls_init(), and also from
-the SNI callback after receiving an SNI, if tls_certificate includes "tls_sni".
-
-We can tell the two apart by state->received_sni being non-NULL in callback.
-
-The callback should not call us unless state->trigger_sni_changes is true,
-which we are responsible for setting on the first pass through.
-
-Arguments:
- state exim_gnutls_state_st *
- errstr error string pointer
-
-Returns: OK/DEFER/FAIL
-*/
+/**************************************************
+* One-time init credentials for server and client *
+**************************************************/
-static int
-tls_expand_session_files(exim_gnutls_state_st * state, uschar ** errstr)
+static void
+creds_basic_init(gnutls_certificate_credentials_t x509_cred, BOOL server)
{
-struct stat statbuf;
-int rc;
-const host_item *host = state->host; /* macro should be reconsidered? */
-uschar *saved_tls_certificate = NULL;
-uschar *saved_tls_privatekey = NULL;
-uschar *saved_tls_verify_certificates = NULL;
-uschar *saved_tls_crl = NULL;
-int cert_count;
-
-/* We check for tls_sni *before* expansion. */
-if (!host) /* server */
- if (!state->received_sni)
- {
- if ( state->tls_certificate
- && ( Ustrstr(state->tls_certificate, US"tls_sni")
- || Ustrstr(state->tls_certificate, US"tls_in_sni")
- || Ustrstr(state->tls_certificate, US"tls_out_sni")
- ) )
- {
- DEBUG(D_tls) debug_printf("We will re-expand TLS session files if we receive SNI.\n");
- state->trigger_sni_changes = TRUE;
- }
- }
- else
- {
- /* useful for debugging */
- saved_tls_certificate = state->exp_tls_certificate;
- saved_tls_privatekey = state->exp_tls_privatekey;
- saved_tls_verify_certificates = state->exp_tls_verify_certificates;
- saved_tls_crl = state->exp_tls_crl;
- }
-
-if ((rc = gnutls_certificate_allocate_credentials(&state->x509_cred)))
- return tls_error_gnu(US"gnutls_certificate_allocate_credentials",
- rc, host, errstr);
-
#ifdef SUPPORT_SRV_OCSP_STACK
-gnutls_certificate_set_flags(state->x509_cred, GNUTLS_CERTIFICATE_API_V2);
+gnutls_certificate_set_flags(x509_cred, GNUTLS_CERTIFICATE_API_V2);
# if !defined(DISABLE_OCSP) && defined(SUPPORT_GNUTLS_EXT_RAW_PARSE)
-if (!host && tls_ocsp_file)
+if (server && tls_ocsp_file)
{
if (f.running_in_test_harness)
tls_server_testharness_ocsp_fiddle();
if (exim_testharness_disable_ocsp_validity_check)
- gnutls_certificate_set_flags(state->x509_cred,
+ gnutls_certificate_set_flags(x509_cred,
GNUTLS_CERTIFICATE_API_V2 | GNUTLS_CERTIFICATE_SKIP_OCSP_RESPONSE_CHECK);
}
# endif
#endif
+DEBUG(D_tls)
+ debug_printf("TLS: basic cred init, %s\n", server ? "server" : "client");
+}
-/* remember: expand_check_tlsvar() is expand_check() but fiddling with
-state members, assuming consistent naming; and expand_check() returns
-false if expansion failed, unless expansion was forced to fail. */
-
-/* check if we at least have a certificate, before doing expensive
-D-H generation. */
-
-if (!expand_check_tlsvar(tls_certificate, errstr))
- return DEFER;
-
-/* certificate is mandatory in server, optional in client */
-
-if ( !state->exp_tls_certificate
- || !*state->exp_tls_certificate
- )
- if (!host)
- return tls_install_selfsign(state, errstr);
- else
- DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n");
-
-if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey, errstr))
- return DEFER;
-
-/* tls_privatekey is optional, defaulting to same file as certificate */
-
-if (!state->tls_privatekey || !*state->tls_privatekey)
- {
- state->tls_privatekey = state->tls_certificate;
- state->exp_tls_privatekey = state->exp_tls_certificate;
- }
-
-
-if (state->exp_tls_certificate && *state->exp_tls_certificate)
- {
- DEBUG(D_tls) debug_printf("certificate file = %s\nkey file = %s\n",
- 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
- )
- {
- DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n");
- }
- else
- {
- DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n");
- }
-
- if (!host) /* server */
- {
- const uschar * clist = state->exp_tls_certificate;
- const uschar * klist = state->exp_tls_privatekey;
- const uschar * olist;
- int csep = 0, ksep = 0, osep = 0, cnt = 0;
- uschar * cfile, * kfile, * ofile;
+static int
+creds_load_server_certs(exim_gnutls_state_st * state, const uschar * cert,
+ const uschar * pkey, const uschar * ocsp, uschar ** errstr)
+{
+const uschar * clist = cert;
+const uschar * klist = pkey;
+const uschar * olist;
+int csep = 0, ksep = 0, osep = 0, cnt = 0, rc;
+uschar * cfile, * kfile, * ofile;
#ifndef DISABLE_OCSP
# ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE
- gnutls_x509_crt_fmt_t ocsp_fmt = GNUTLS_X509_FMT_DER;
+gnutls_x509_crt_fmt_t ocsp_fmt = GNUTLS_X509_FMT_DER;
# endif
- if (!expand_check(tls_ocsp_file, US"tls_ocsp_file", &ofile, errstr))
- return DEFER;
- olist = ofile;
+if (!expand_check(ocsp, US"tls_ocsp_file", &ofile, errstr))
+ return DEFER;
+olist = ofile;
#endif
- while (cfile = string_nextinlist(&clist, &csep, NULL, 0))
+while (cfile = string_nextinlist(&clist, &csep, NULL, 0))
- if (!(kfile = string_nextinlist(&klist, &ksep, NULL, 0)))
- return tls_error(US"cert/key setup: out of keys", NULL, host, errstr);
- else if (0 < (rc = tls_add_certfile(state, host, cfile, kfile, errstr)))
- return rc;
- else
- {
- int gnutls_cert_index = -rc;
- DEBUG(D_tls) debug_printf("TLS: cert/key %d %s registered\n",
- gnutls_cert_index, cfile);
+ if (!(kfile = string_nextinlist(&klist, &ksep, NULL, 0)))
+ return tls_error(US"cert/key setup: out of keys", NULL, NULL, errstr);
+ else if ((rc = tls_add_certfile(state, NULL, cfile, kfile, errstr)) > 0)
+ return rc;
+ else
+ {
+ int gnutls_cert_index = -rc;
+ DEBUG(D_tls) debug_printf("TLS: cert/key %d %s registered\n",
+ gnutls_cert_index, cfile);
#ifndef DISABLE_OCSP
- if (tls_ocsp_file)
- {
- /* Set the OCSP stapling server info */
- if (gnutls_buggy_ocsp)
- {
- DEBUG(D_tls)
- debug_printf("GnuTLS library is buggy for OCSP; avoiding\n");
- }
- else if ((ofile = string_nextinlist(&olist, &osep, NULL, 0)))
- {
- DEBUG(D_tls) debug_printf("OCSP response file %d = %s\n",
- gnutls_cert_index, ofile);
+ if (ocsp)
+ {
+ /* Set the OCSP stapling server info */
+ if (gnutls_buggy_ocsp)
+ {
+ DEBUG(D_tls)
+ debug_printf("GnuTLS library is buggy for OCSP; avoiding\n");
+ }
+ else if ((ofile = string_nextinlist(&olist, &osep, NULL, 0)))
+ {
+ DEBUG(D_tls) debug_printf("OCSP response file %d = %s\n",
+ gnutls_cert_index, ofile);
# ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE
- if (Ustrncmp(ofile, US"PEM ", 4) == 0)
- {
- ocsp_fmt = GNUTLS_X509_FMT_PEM;
- ofile += 4;
- }
- else if (Ustrncmp(ofile, US"DER ", 4) == 0)
- {
- ocsp_fmt = GNUTLS_X509_FMT_DER;
- ofile += 4;
- }
-
- if ((rc = gnutls_certificate_set_ocsp_status_request_file2(
- state->x509_cred, CCS ofile, gnutls_cert_index,
- ocsp_fmt)) < 0)
- return tls_error_gnu(
- US"gnutls_certificate_set_ocsp_status_request_file2",
- rc, host, errstr);
- DEBUG(D_tls)
- debug_printf(" %d response%s loaded\n", rc, rc>1 ? "s":"");
+ if (Ustrncmp(ofile, US"PEM ", 4) == 0)
+ {
+ ocsp_fmt = GNUTLS_X509_FMT_PEM;
+ ofile += 4;
+ }
+ else if (Ustrncmp(ofile, US"DER ", 4) == 0)
+ {
+ ocsp_fmt = GNUTLS_X509_FMT_DER;
+ ofile += 4;
+ }
- /* Arrange callbacks for OCSP request observability */
+ if ((rc = gnutls_certificate_set_ocsp_status_request_file2(
+ state->lib_state.x509_cred, CCS ofile, gnutls_cert_index,
+ ocsp_fmt)) < 0)
+ return tls_error_gnu(
+ US"gnutls_certificate_set_ocsp_status_request_file2",
+ rc, NULL, errstr);
+ DEBUG(D_tls)
+ debug_printf(" %d response%s loaded\n", rc, rc>1 ? "s":"");
+
+ /* Arrange callbacks for OCSP request observability */
+
+ if (state->session)
+ gnutls_handshake_set_hook_function(state->session,
+ GNUTLS_HANDSHAKE_ANY, GNUTLS_HOOK_POST, tls_server_hook_cb);
+ else
+ state->lib_state.ocsp_hook = TRUE;
- gnutls_handshake_set_hook_function(state->session,
- GNUTLS_HANDSHAKE_ANY, GNUTLS_HOOK_POST, tls_server_hook_cb);
# else
# if defined(SUPPORT_SRV_OCSP_STACK)
- if ((rc = gnutls_certificate_set_ocsp_status_request_function2(
- state->x509_cred, gnutls_cert_index,
- server_ocsp_stapling_cb, ofile)))
- return tls_error_gnu(
- US"gnutls_certificate_set_ocsp_status_request_function2",
- rc, host, errstr);
- else
+ if ((rc = gnutls_certificate_set_ocsp_status_request_function2(
+ state->lib_state.x509_cred, gnutls_cert_index,
+ server_ocsp_stapling_cb, ofile)))
+ return tls_error_gnu(
+ US"gnutls_certificate_set_ocsp_status_request_function2",
+ rc, NULL, errstr);
+ else
# endif
- {
- if (cnt++ > 0)
- {
- DEBUG(D_tls)
- debug_printf("oops; multiple OCSP files not supported\n");
- break;
- }
- gnutls_certificate_set_ocsp_status_request_function(
- state->x509_cred, server_ocsp_stapling_cb, ofile);
- }
-# endif /* SUPPORT_GNUTLS_EXT_RAW_PARSE */
+ {
+ if (cnt++ > 0)
+ {
+ DEBUG(D_tls)
+ debug_printf("oops; multiple OCSP files not supported\n");
+ break;
}
- else
- DEBUG(D_tls) debug_printf("ran out of OCSP response files in list\n");
+ gnutls_certificate_set_ocsp_status_request_function(
+ state->lib_state.x509_cred, server_ocsp_stapling_cb, ofile);
}
-#endif /* DISABLE_OCSP */
+# endif /* SUPPORT_GNUTLS_EXT_RAW_PARSE */
}
+ else
+ DEBUG(D_tls) debug_printf("ran out of OCSP response files in list\n");
+ }
+#endif /* DISABLE_OCSP */
}
- else /* client */
- {
- if (0 < (rc = tls_add_certfile(state, host,
- state->exp_tls_certificate, state->exp_tls_privatekey, errstr)))
- return rc;
- DEBUG(D_tls) debug_printf("TLS: cert/key registered\n");
- }
-
- } /* tls_certificate */
-
-
-/* Set the trusted CAs file if one is provided, and then add the CRL if one is
-provided. Experiment shows that, if the certificate file is empty, an unhelpful
-error message is provided. However, if we just refrain from setting anything up
-in that case, certificate verification fails, which seems to be the correct
-behaviour. */
+return 0;
+}
-if (state->tls_verify_certificates && *state->tls_verify_certificates)
- {
- if (!expand_check_tlsvar(tls_verify_certificates, errstr))
- return DEFER;
-#ifndef SUPPORT_SYSDEFAULT_CABUNDLE
- if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0)
- state->exp_tls_verify_certificates = NULL;
-#endif
- if (state->tls_crl && *state->tls_crl)
- if (!expand_check_tlsvar(tls_crl, errstr))
- return DEFER;
+static int
+creds_load_client_certs(exim_gnutls_state_st * state, const host_item * host,
+ const uschar * cert, const uschar * pkey, uschar ** errstr)
+{
+int rc = tls_add_certfile(state, host, cert, pkey, errstr);
+if (rc > 0) return rc;
+DEBUG(D_tls) debug_printf("TLS: cert/key registered\n");
+return 0;
+}
- if (!(state->exp_tls_verify_certificates &&
- *state->exp_tls_verify_certificates))
- {
- DEBUG(D_tls)
- debug_printf("TLS: tls_verify_certificates expanded empty, ignoring\n");
- /* With no tls_verify_certificates, we ignore tls_crl too */
- return OK;
- }
- }
-else
- {
- DEBUG(D_tls)
- debug_printf("TLS: tls_verify_certificates not set or empty, ignoring\n");
- return OK;
- }
+static int
+creds_load_cabundle(exim_gnutls_state_st * state, const uschar * bundle,
+ const host_item * host, uschar ** errstr)
+{
+int cert_count;
+struct stat statbuf;
#ifdef SUPPORT_SYSDEFAULT_CABUNDLE
-if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0)
- cert_count = gnutls_certificate_set_x509_system_trust(state->x509_cred);
+if (Ustrcmp(bundle, "system") == 0 || Ustrncmp(bundle, "system,", 7) == 0)
+ cert_count = gnutls_certificate_set_x509_system_trust(state->lib_state.x509_cred);
else
#endif
{
- if (Ustat(state->exp_tls_verify_certificates, &statbuf) < 0)
+ if (Ustat(bundle, &statbuf) < 0)
{
log_write(0, LOG_MAIN|LOG_PANIC, "could not stat '%s' "
- "(tls_verify_certificates): %s", state->exp_tls_verify_certificates,
- strerror(errno));
+ "(tls_verify_certificates): %s", bundle, strerror(errno));
return DEFER;
}
So s/!S_ISREG/S_ISDIR/ and change some messaging ... */
if (S_ISDIR(statbuf.st_mode))
{
- DEBUG(D_tls)
- debug_printf("verify certificates path is a dir: \"%s\"\n",
- state->exp_tls_verify_certificates);
log_write(0, LOG_MAIN|LOG_PANIC,
- "tls_verify_certificates \"%s\" is a directory",
- state->exp_tls_verify_certificates);
+ "tls_verify_certificates \"%s\" is a directory", bundle);
return DEFER;
}
#endif
DEBUG(D_tls) debug_printf("verify certificates = %s size=" OFF_T_FMT "\n",
- state->exp_tls_verify_certificates, statbuf.st_size);
+ bundle, statbuf.st_size);
if (statbuf.st_size == 0)
{
#ifdef SUPPORT_CA_DIR
(statbuf.st_mode & S_IFMT) == S_IFDIR
?
- gnutls_certificate_set_x509_trust_dir(state->x509_cred,
- CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM)
+ gnutls_certificate_set_x509_trust_dir(state->lib_state.x509_cred,
+ CS bundle, GNUTLS_X509_FMT_PEM)
:
#endif
- gnutls_certificate_set_x509_trust_file(state->x509_cred,
- CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM);
+ gnutls_certificate_set_x509_trust_file(state->lib_state.x509_cred,
+ CS bundle, GNUTLS_X509_FMT_PEM);
#ifdef SUPPORT_CA_DIR
/* Mimic the behaviour with OpenSSL of not advertising a usable-cert list
when using the directory-of-certs config model. */
if ((statbuf.st_mode & S_IFMT) == S_IFDIR)
- gnutls_certificate_send_x509_rdn_sequence(state->session, 1);
+ if (state->session)
+ gnutls_certificate_send_x509_rdn_sequence(state->session, 1);
+ else
+ state->lib_state.ca_rdn_emulate = TRUE;
#endif
}
if (cert_count < 0)
return tls_error_gnu(US"setting certificate trust", cert_count, host, errstr);
DEBUG(D_tls)
- debug_printf("Added %d certificate authorities.\n", cert_count);
-
-if (state->tls_crl && *state->tls_crl &&
- state->exp_tls_crl && *state->exp_tls_crl)
- {
- DEBUG(D_tls) debug_printf("loading CRL file = %s\n", state->exp_tls_crl);
- if ((cert_count = gnutls_certificate_set_x509_crl_file(state->x509_cred,
- CS state->exp_tls_crl, GNUTLS_X509_FMT_PEM)) < 0)
- return tls_error_gnu(US"gnutls_certificate_set_x509_crl_file",
- cert_count, host, errstr);
-
- DEBUG(D_tls) debug_printf("Processed %d CRLs.\n", cert_count);
- }
+ debug_printf("Added %d certificate authorities\n", cert_count);
return OK;
}
+static int
+creds_load_crl(exim_gnutls_state_st * state, const uschar * crl, uschar ** errstr)
+{
+int cert_count;
+DEBUG(D_tls) debug_printf("loading CRL file = %s\n", crl);
+if ((cert_count = gnutls_certificate_set_x509_crl_file(state->lib_state.x509_cred,
+ CS crl, GNUTLS_X509_FMT_PEM)) < 0)
+ return tls_error_gnu(US"gnutls_certificate_set_x509_crl_file",
+ cert_count, state->host, errstr);
+DEBUG(D_tls) debug_printf("Processed %d CRLs\n", cert_count);
+return OK;
+}
-/*************************************************
-* Set X.509 state variables *
-*************************************************/
-/* In GnuTLS, the registered cert/key are not replaced by a later
+static int
+creds_load_pristring(exim_gnutls_state_st * state, const uschar * p,
+ const char ** errpos)
+{
+if (!p)
+ {
+ p = exim_default_gnutls_priority;
+ DEBUG(D_tls)
+ debug_printf("GnuTLS using default session cipher/priority \"%s\"\n", p);
+ }
+return gnutls_priority_init( (gnutls_priority_t *) &state->lib_state.pri_cache,
+ CCS p, errpos);
+}
+
+static void
+tls_server_creds_init(void)
+{
+uschar * dummy_errstr;
+
+state_server.lib_state = null_tls_preload;
+if (gnutls_certificate_allocate_credentials(
+ (gnutls_certificate_credentials_t *) &state_server.lib_state.x509_cred))
+ {
+ state_server.lib_state.x509_cred = NULL;
+ return;
+ }
+creds_basic_init(state_server.lib_state.x509_cred, TRUE);
+
+#ifdef EXIM_HAVE_INOTIFY
+/* If tls_certificate has any $ indicating expansions, it is not good.
+If tls_privatekey is set but has $, not good. Likewise for tls_ocsp_file.
+If all good (and tls_certificate set), load the cert(s). Do not try
+to handle selfsign generation for now (tls_certificate null/empty;
+XXX will want to do that later though) due to the lifetime/expiry issue. */
+
+if ( opt_set_and_noexpand(tls_certificate)
+# ifndef DISABLE_OCSP
+ && opt_unset_or_noexpand(tls_ocsp_file)
+# endif
+ && opt_unset_or_noexpand(tls_privatekey))
+ {
+ /* Set watches on the filenames. The implementation does de-duplication
+ so we can just blindly do them all.
+ */
+
+ if ( tls_set_watch(tls_certificate, TRUE)
+# ifndef DISABLE_OCSP
+ && tls_set_watch(tls_ocsp_file, TRUE)
+# endif
+ && tls_set_watch(tls_privatekey, TRUE))
+ {
+ DEBUG(D_tls) debug_printf("TLS: preloading server certs\n");
+ if (creds_load_server_certs(&state_server, tls_certificate,
+ tls_privatekey && *tls_privatekey ? tls_privatekey : tls_certificate,
+# ifdef DISABLE_OCSP
+ NULL,
+# else
+ tls_ocsp_file,
+# endif
+ &dummy_errstr) == 0)
+ state_server.lib_state.conn_certs = TRUE;
+ }
+ }
+else
+ DEBUG(D_tls) debug_printf("TLS: not preloading server certs\n");
+
+/* If tls_verify_certificates is non-empty and has no $, load CAs */
+
+if (opt_set_and_noexpand(tls_verify_certificates))
+ {
+ if (tls_set_watch(tls_verify_certificates, FALSE))
+ {
+ DEBUG(D_tls) debug_printf("TLS: preloading CA bundle for server\n");
+ if (creds_load_cabundle(&state_server, tls_verify_certificates,
+ NULL, &dummy_errstr) != OK)
+ return;
+ state_server.lib_state.cabundle = TRUE;
+
+ /* If CAs loaded and tls_crl is non-empty and has no $, load it */
+
+ if (opt_set_and_noexpand(tls_crl))
+ {
+ if (tls_set_watch(tls_crl, FALSE))
+ {
+ DEBUG(D_tls) debug_printf("TLS: preloading CRL for server\n");
+ if (creds_load_crl(&state_server, tls_crl, &dummy_errstr) != OK)
+ return;
+ state_server.lib_state.crl = TRUE;
+ }
+ }
+ else
+ DEBUG(D_tls) debug_printf("TLS: not preloading CRL for server\n");
+ }
+ }
+else
+ DEBUG(D_tls) debug_printf("TLS: not preloading CA bundle for server\n");
+#endif /* EXIM_HAVE_INOTIFY */
+
+/* If tls_require_ciphers is non-empty and has no $, load the
+ciphers priority cache. If unset, load with the default.
+(server-only as the client one depends on non/DANE) */
+
+if (!tls_require_ciphers || opt_set_and_noexpand(tls_require_ciphers))
+ {
+ const char * dummy_errpos;
+ DEBUG(D_tls) debug_printf("TLS: preloading cipher list for server: %s\n",
+ tls_require_ciphers);
+ if ( creds_load_pristring(&state_server, tls_require_ciphers, &dummy_errpos)
+ == OK)
+ state_server.lib_state.pri_string = TRUE;
+ }
+else
+ DEBUG(D_tls) debug_printf("TLS: not preloading cipher list for server\n");
+}
+
+
+/* Preload whatever creds are static, onto a transport. The client can then
+just copy the pointer as it starts up. */
+
+static void
+tls_client_creds_init(transport_instance * t, BOOL watch)
+{
+smtp_transport_options_block * ob = t->options_block;
+exim_gnutls_state_st tpt_dummy_state;
+host_item * dummy_host = (host_item *)1;
+uschar * dummy_errstr;
+
+if (!exim_gnutls_base_init_done)
+ tls_g_init();
+
+ob->tls_preload = null_tls_preload;
+if (gnutls_certificate_allocate_credentials(
+ (struct gnutls_certificate_credentials_st **)&ob->tls_preload.x509_cred))
+ {
+ ob->tls_preload.x509_cred = NULL;
+ return;
+ }
+creds_basic_init(ob->tls_preload.x509_cred, FALSE);
+
+tpt_dummy_state.session = NULL;
+tpt_dummy_state.lib_state = ob->tls_preload;
+
+#ifdef EXIM_HAVE_INOTIFY
+if ( opt_set_and_noexpand(ob->tls_certificate)
+ && opt_unset_or_noexpand(ob->tls_privatekey))
+ {
+ if ( !watch
+ || ( tls_set_watch(ob->tls_certificate, FALSE)
+ && tls_set_watch(ob->tls_privatekey, FALSE)
+ ) )
+ {
+ const uschar * pkey = ob->tls_privatekey;
+
+ DEBUG(D_tls)
+ debug_printf("TLS: preloading client certs for transport '%s'\n", t->name);
+
+ /* The state->lib_state.x509_cred is used for the certs load, and is the sole
+ structure element used. So we can set up a dummy. The hoat arg only
+ selects a retcode in case of fail, so any value */
+
+ if (creds_load_client_certs(&tpt_dummy_state, dummy_host,
+ ob->tls_certificate, pkey ? pkey : ob->tls_certificate,
+ &dummy_errstr) == OK)
+ ob->tls_preload.conn_certs = TRUE;
+ }
+ }
+else
+ DEBUG(D_tls)
+ debug_printf("TLS: not preloading client certs, for transport '%s'\n", t->name);
+
+if (opt_set_and_noexpand(ob->tls_verify_certificates))
+ {
+ if (!watch || tls_set_watch(ob->tls_verify_certificates, FALSE))
+ {
+ DEBUG(D_tls)
+ debug_printf("TLS: preloading CA bundle for transport '%s'\n", t->name);
+ if (creds_load_cabundle(&tpt_dummy_state, ob->tls_verify_certificates,
+ dummy_host, &dummy_errstr) != OK)
+ return;
+ ob->tls_preload.cabundle = TRUE;
+
+ if (opt_set_and_noexpand(ob->tls_crl))
+ {
+ if (!watch || tls_set_watch(ob->tls_crl, FALSE))
+ {
+ DEBUG(D_tls) debug_printf("TLS: preloading CRL for transport '%s'\n", t->name);
+ if (creds_load_crl(&tpt_dummy_state, ob->tls_crl, &dummy_errstr) != OK)
+ return;
+ ob->tls_preload.crl = TRUE;
+ }
+ }
+ else
+ DEBUG(D_tls) debug_printf("TLS: not preloading CRL, for transport '%s'\n", t->name);
+ }
+ }
+else
+ DEBUG(D_tls)
+ debug_printf("TLS: not preloading CA bundle, for transport '%s'\n", t->name);
+
+/* We do not preload tls_require_ciphers to to the transport as it implicitly
+depends on DANE or plain usage. */
+
+#endif
+}
+
+
+#ifdef EXIM_HAVE_INOTIFY
+/* Invalidate the creds cached, by dropping the current ones.
+Call when we notice one of the source files has changed. */
+
+static void
+tls_server_creds_invalidate(void)
+{
+if (state_server.lib_state.pri_cache)
+ gnutls_priority_deinit(state_server.lib_state.pri_cache);
+state_server.lib_state.pri_cache = NULL;
+
+if (state_server.lib_state.x509_cred)
+ gnutls_certificate_free_credentials(state_server.lib_state.x509_cred);
+state_server.lib_state = null_tls_preload;
+}
+
+
+static void
+tls_client_creds_invalidate(transport_instance * t)
+{
+smtp_transport_options_block * ob = t->options_block;
+if (ob->tls_preload.x509_cred)
+ gnutls_certificate_free_credentials(ob->tls_preload.x509_cred);
+ob->tls_preload = null_tls_preload;
+}
+#endif
+
+
+/*************************************************
+* Variables re-expanded post-SNI *
+*************************************************/
+
+/* Called from both server and client code, via tls_init(), and also from
+the SNI callback after receiving an SNI, if tls_certificate includes "tls_sni".
+
+We can tell the two apart by state->received_sni being non-NULL in callback.
+
+The callback should not call us unless state->trigger_sni_changes is true,
+which we are responsible for setting on the first pass through.
+
+Arguments:
+ state exim_gnutls_state_st *
+ errstr error string pointer
+
+Returns: OK/DEFER/FAIL
+*/
+
+static int
+tls_expand_session_files(exim_gnutls_state_st * state, uschar ** errstr)
+{
+int rc;
+const host_item *host = state->host; /* macro should be reconsidered? */
+const uschar *saved_tls_certificate = NULL;
+const uschar *saved_tls_privatekey = NULL;
+const uschar *saved_tls_verify_certificates = NULL;
+const uschar *saved_tls_crl = NULL;
+int cert_count;
+
+/* We check for tls_sni *before* expansion. */
+if (!host) /* server */
+ if (!state->received_sni)
+ {
+ if ( state->tls_certificate
+ && ( Ustrstr(state->tls_certificate, US"tls_sni")
+ || Ustrstr(state->tls_certificate, US"tls_in_sni")
+ || Ustrstr(state->tls_certificate, US"tls_out_sni")
+ ) )
+ {
+ DEBUG(D_tls) debug_printf("We will re-expand TLS session files if we receive SNI\n");
+ state->trigger_sni_changes = TRUE;
+ }
+ }
+ else /* SNI callback case */
+ {
+ /* useful for debugging */
+ saved_tls_certificate = state->exp_tls_certificate;
+ saved_tls_privatekey = state->exp_tls_privatekey;
+ saved_tls_verify_certificates = state->exp_tls_verify_certificates;
+ saved_tls_crl = state->exp_tls_crl;
+ }
+
+if (!state->lib_state.x509_cred)
+ {
+ if ((rc = gnutls_certificate_allocate_credentials(
+ (gnutls_certificate_credentials_t *) &state->lib_state.x509_cred)))
+ return tls_error_gnu(US"gnutls_certificate_allocate_credentials",
+ rc, host, errstr);
+ creds_basic_init(state->lib_state.x509_cred, !host);
+ }
+
+
+/* remember: Expand_check_tlsvar() is expand_check() but fiddling with
+state members, assuming consistent naming; and expand_check() returns
+false if expansion failed, unless expansion was forced to fail. */
+
+/* check if we at least have a certificate, before doing expensive
+D-H generation. */
+
+if (!state->lib_state.conn_certs)
+ {
+ if (!Expand_check_tlsvar(tls_certificate, errstr))
+ return DEFER;
+
+ /* certificate is mandatory in server, optional in client */
+
+ if ( !state->exp_tls_certificate
+ || !*state->exp_tls_certificate
+ )
+ if (!host)
+ return tls_install_selfsign(state, errstr);
+ else
+ DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n");
+
+ if (state->tls_privatekey && !Expand_check_tlsvar(tls_privatekey, errstr))
+ return DEFER;
+
+ /* tls_privatekey is optional, defaulting to same file as certificate */
+
+ if (!state->tls_privatekey || !*state->tls_privatekey)
+ {
+ state->tls_privatekey = state->tls_certificate;
+ state->exp_tls_privatekey = state->exp_tls_certificate;
+ }
+
+ if (state->exp_tls_certificate && *state->exp_tls_certificate)
+ {
+ BOOL load = TRUE;
+ DEBUG(D_tls) debug_printf("certificate file = %s\nkey file = %s\n",
+ 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
+ )
+ {
+ DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n");
+ load = FALSE; /* avoid re-loading the same certs */
+ }
+ else /* unload the pre-SNI certs before loading new ones */
+ {
+ DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair\n");
+ gnutls_certificate_free_keys(state->lib_state.x509_cred);
+ }
+
+ if ( load
+ && (rc = host
+ ? creds_load_client_certs(state, host, state->exp_tls_certificate,
+ state->exp_tls_privatekey, errstr)
+ : creds_load_server_certs(state, state->exp_tls_certificate,
+ state->exp_tls_privatekey,
+#ifdef DISABLE_OCSP
+ NULL,
+#else
+ tls_ocsp_file,
+#endif
+ errstr)
+ ) ) return rc;
+ }
+ }
+else
+ {
+ DEBUG(D_tls)
+ debug_printf("%s certs were preloaded\n", host ? "client" : "server");
+
+ if (!state->tls_privatekey) state->tls_privatekey = state->tls_certificate;
+ state->exp_tls_certificate = US state->tls_certificate;
+ state->exp_tls_privatekey = US state->tls_privatekey;
+
+#ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE
+ if (state->lib_state.ocsp_hook)
+ gnutls_handshake_set_hook_function(state->session,
+ GNUTLS_HANDSHAKE_ANY, GNUTLS_HOOK_POST, tls_server_hook_cb);
+#endif
+ }
+
+
+/* Set the trusted CAs file if one is provided, and then add the CRL if one is
+provided. Experiment shows that, if the certificate file is empty, an unhelpful
+error message is provided. However, if we just refrain from setting anything up
+in that case, certificate verification fails, which seems to be the correct
+behaviour. */
+
+if (!state->lib_state.cabundle)
+ {
+ if (state->tls_verify_certificates && *state->tls_verify_certificates)
+ {
+ if (!Expand_check_tlsvar(tls_verify_certificates, errstr))
+ return DEFER;
+#ifndef SUPPORT_SYSDEFAULT_CABUNDLE
+ if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0)
+ state->exp_tls_verify_certificates = NULL;
+#endif
+ if (state->tls_crl && *state->tls_crl)
+ if (!Expand_check_tlsvar(tls_crl, errstr))
+ return DEFER;
+
+ if (!(state->exp_tls_verify_certificates &&
+ *state->exp_tls_verify_certificates))
+ {
+ DEBUG(D_tls)
+ debug_printf("TLS: tls_verify_certificates expanded empty, ignoring\n");
+ /* With no tls_verify_certificates, we ignore tls_crl too */
+ return OK;
+ }
+ }
+ else
+ {
+ DEBUG(D_tls)
+ debug_printf("TLS: tls_verify_certificates not set or empty, ignoring\n");
+ return OK;
+ }
+ rc = creds_load_cabundle(state, state->exp_tls_verify_certificates, host, errstr);
+ if (rc != OK) return rc;
+ }
+else
+ {
+ DEBUG(D_tls)
+ debug_printf("%s CA bundle was preloaded\n", host ? "client" : "server");
+ state->exp_tls_verify_certificates = US state->tls_verify_certificates;
+
+#ifdef SUPPORT_CA_DIR
+/* Mimic the behaviour with OpenSSL of not advertising a usable-cert list
+when using the directory-of-certs config model. */
+ if (state->lib_state.ca_rdn_emulate)
+ gnutls_certificate_send_x509_rdn_sequence(state->session, 1);
+#endif
+ }
+
+
+if (!state->lib_state.crl)
+ {
+ if ( state->tls_crl && *state->tls_crl
+ && state->exp_tls_crl && *state->exp_tls_crl)
+ return creds_load_crl(state, state->exp_tls_crl, errstr);
+ }
+else
+ {
+ DEBUG(D_tls)
+ debug_printf("%s CRL was preloaded\n", host ? "client" : "server");
+ state->exp_tls_crl = US state->tls_crl;
+ }
+
+return OK;
+}
+
+
+
+
+/*************************************************
+* Set X.509 state variables *
+*************************************************/
+
+/* In GnuTLS, the registered cert/key are not replaced by a later
set of a cert/key, so for SNI support we need a whole new x509_cred
structure. Which means various other non-re-expanded pieces of state
need to be re-set in the new struct, so the setting logic is pulled
if ((rc = init_server_dh(errstr)) != OK) return rc;
/* Unnecessary & discouraged with 3.6.0 or later */
- gnutls_certificate_set_dh_params(state->x509_cred, dh_server_params);
+ gnutls_certificate_set_dh_params(state->lib_state.x509_cred, dh_server_params);
}
#endif
/* Link the credentials to the session. */
if ((rc = gnutls_credentials_set(state->session,
- GNUTLS_CRD_CERTIFICATE, state->x509_cred)))
+ GNUTLS_CRD_CERTIFICATE, state->lib_state.x509_cred)))
return tls_error_gnu(US"gnutls_credentials_set", rc, host, errstr);
return OK;
*************************************************/
-#ifndef DISABLE_OCSP
-
-static BOOL
-tls_is_buggy_ocsp(void)
-{
-const uschar * s;
-uschar maj, mid, mic;
-
-s = CUS gnutls_check_version(NULL);
-maj = atoi(CCS s);
-if (maj == 3)
- {
- while (*s && *s != '.') s++;
- mid = atoi(CCS ++s);
- if (mid <= 2)
- return TRUE;
- else if (mid >= 5)
- return FALSE;
- else
- {
- while (*s && *s != '.') s++;
- mic = atoi(CCS ++s);
- return mic <= (mid == 3 ? 16 : 3);
- }
- }
-return FALSE;
-}
-
-#endif
-
-
/* Called from both server and client code. In the case of a server, errors
before actual TLS negotiation return DEFER.
Arguments:
host connected host, if client; NULL if server
- certificate certificate file
- privatekey private key file
- sni TLS SNI to send, sometimes when client; else NULL
- cas CA certs file
- crl CRL file
+ ob tranport options block, if client; NULL if server
require_ciphers tls_require_ciphers setting
caller_state returned state-info structure
errstr error string pointer
static int
tls_init(
const host_item *host,
- const uschar *certificate,
- const uschar *privatekey,
- const uschar *sni,
- const uschar *cas,
- const uschar *crl,
- const uschar *require_ciphers,
+ smtp_transport_options_block * ob,
+ const uschar * require_ciphers,
exim_gnutls_state_st **caller_state,
tls_support * tlsp,
uschar ** errstr)
exim_gnutls_state_st * state;
int rc;
size_t sz;
-const char * errpos;
-const uschar * p;
if (!exim_gnutls_base_init_done)
- {
- DEBUG(D_tls) debug_printf("GnuTLS global init required.\n");
-
-#if defined(HAVE_GNUTLS_PKCS11) && !defined(GNUTLS_AUTO_PKCS11_MANUAL)
- /* By default, gnutls_global_init will init PKCS11 support in auto mode,
- which loads modules from a config file, which sounds good and may be wanted
- by some sysadmin, but also means in common configurations that GNOME keyring
- environment variables are used and so breaks for users calling mailq.
- To prevent this, we init PKCS11 first, which is the documented approach. */
- if (!gnutls_allow_auto_pkcs11)
- if ((rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL)))
- return tls_error_gnu(US"gnutls_pkcs11_init", rc, host, errstr);
-#endif
-
-#ifndef GNUTLS_AUTO_GLOBAL_INIT
- if ((rc = gnutls_global_init()))
- return tls_error_gnu(US"gnutls_global_init", rc, host, errstr);
-#endif
-
-#if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0
- DEBUG(D_tls)
- {
- gnutls_global_set_log_function(exim_gnutls_logger_cb);
- /* arbitrarily chosen level; bump up to 9 for more */
- gnutls_global_set_log_level(EXIM_GNUTLS_LIBRARY_LOG_LEVEL);
- }
-#endif
-
-#ifndef DISABLE_OCSP
- if (tls_ocsp_file && (gnutls_buggy_ocsp = tls_is_buggy_ocsp()))
- log_write(0, LOG_MAIN, "OCSP unusable with this GnuTLS library version");
-#endif
-
- exim_gnutls_base_init_done = TRUE;
- }
+ tls_g_init();
if (host)
{
/* For client-side sessions we allocate a context. This lets us run
several in parallel. */
+
int old_pool = store_pool;
store_pool = POOL_PERM;
state = store_get(sizeof(exim_gnutls_state_st), FALSE);
store_pool = old_pool;
memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init));
+ state->lib_state = ob->tls_preload;
state->tlsp = tlsp;
DEBUG(D_tls) debug_printf("initialising GnuTLS client session\n");
rc = gnutls_init(&state->session, GNUTLS_CLIENT);
+
+ state->tls_certificate = ob->tls_certificate;
+ state->tls_privatekey = ob->tls_privatekey;
+ state->tls_sni = ob->tls_sni;
+ state->tls_verify_certificates = ob->tls_verify_certificates;
+ state->tls_crl = ob->tls_crl;
}
else
{
+ /* Server operations always use the one state_server context. It is not
+ shared because we have forked a fresh process for every receive. However it
+ can get re-used for successive TLS sessions on a single TCP connection. */
+
state = &state_server;
- memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init));
state->tlsp = tlsp;
DEBUG(D_tls) debug_printf("initialising GnuTLS server session\n");
rc = gnutls_init(&state->session, GNUTLS_SERVER);
+
+ state->tls_certificate = tls_certificate;
+ state->tls_privatekey = tls_privatekey;
+ state->tls_sni = NULL;
+ state->tls_verify_certificates = tls_verify_certificates;
+ state->tls_crl = tls_crl;
}
if (rc)
return tls_error_gnu(US"gnutls_init", rc, host, errstr);
+state->tls_require_ciphers = require_ciphers;
state->host = host;
-state->tls_certificate = certificate;
-state->tls_privatekey = privatekey;
-state->tls_require_ciphers = require_ciphers;
-state->tls_sni = sni;
-state->tls_verify_certificates = cas;
-state->tls_crl = crl;
-
/* This handles the variables that might get re-expanded after TLS SNI;
that's tls_certificate, tls_privatekey, tls_verify_certificates, tls_crl */
DEBUG(D_tls)
- debug_printf("Expanding various TLS configuration options for session credentials.\n");
+ debug_printf("Expanding various TLS configuration options for session credentials\n");
if ((rc = tls_expand_session_files(state, errstr)) != OK) return rc;
/* These are all other parts of the x509_cred handling, since SNI in GnuTLS
/* set SNI in client, only */
if (host)
{
- if (!expand_check(sni, US"tls_out_sni", &state->tlsp->sni, errstr))
+ if (!expand_check(state->tls_sni, US"tls_out_sni", &state->tlsp->sni, errstr))
return DEFER;
if (state->tlsp->sni && *state->tlsp->sni)
{
DEBUG(D_tls) debug_printf("*** PROBABLY A BUG *** " \
"have an SNI set for a server [%s]\n", state->tls_sni);
-/* This is the priority string support,
-http://www.gnutls.org/manual/html_node/Priority-Strings.html
-and replaces gnutls_require_kx, gnutls_require_mac & gnutls_require_protocols.
-This was backwards incompatible, but means Exim no longer needs to track
-all algorithms and provide string forms for them. */
-
-p = NULL;
-if (state->tls_require_ciphers && *state->tls_require_ciphers)
+if (!state->lib_state.pri_string)
{
- if (!expand_check_tlsvar(tls_require_ciphers, errstr))
- return DEFER;
- if (state->exp_tls_require_ciphers && *state->exp_tls_require_ciphers)
+ const uschar * p = NULL;
+ const char * errpos;
+
+ /* This is the priority string support,
+ http://www.gnutls.org/manual/html_node/Priority-Strings.html
+ and replaces gnutls_require_kx, gnutls_require_mac & gnutls_require_protocols.
+ This was backwards incompatible, but means Exim no longer needs to track
+ all algorithms and provide string forms for them. */
+
+ if (state->tls_require_ciphers && *state->tls_require_ciphers)
{
- p = state->exp_tls_require_ciphers;
- DEBUG(D_tls) debug_printf("GnuTLS session cipher/priority \"%s\"\n", p);
+ if (!Expand_check_tlsvar(tls_require_ciphers, errstr))
+ return DEFER;
+ if (state->exp_tls_require_ciphers && *state->exp_tls_require_ciphers)
+ {
+ p = state->exp_tls_require_ciphers;
+ DEBUG(D_tls) debug_printf("GnuTLS session cipher/priority \"%s\"\n", p);
+ }
}
+
+ if ((rc = creds_load_pristring(state, p, &errpos)))
+ return tls_error_gnu(string_sprintf(
+ "gnutls_priority_init(%s) failed at offset %ld, \"%.6s..\"",
+ p, errpos - CS p, errpos),
+ rc, host, errstr);
}
-if (!p)
+else
{
- p = exim_default_gnutls_priority;
- DEBUG(D_tls)
- debug_printf("GnuTLS using default session cipher/priority \"%s\"\n", p);
+ DEBUG(D_tls) debug_printf("cipher list preloaded\n");
+ state->exp_tls_require_ciphers = US state->tls_require_ciphers;
}
-if ((rc = gnutls_priority_init(&state->priority_cache, CCS p, &errpos)))
- return tls_error_gnu(string_sprintf(
- "gnutls_priority_init(%s) failed at offset %ld, \"%.6s..\"",
- p, errpos - CS p, errpos),
- rc, host, errstr);
-if ((rc = gnutls_priority_set(state->session, state->priority_cache)))
+if ((rc = gnutls_priority_set(state->session, state->lib_state.pri_cache)))
return tls_error_gnu(US"gnutls_priority_set", rc, host, errstr);
/* This also sets the server ticket expiration time to the same, and
{
DEBUG(D_tls)
if (rc == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE)
- debug_printf("TLS: no SNI presented in handshake.\n");
+ debug_printf("TLS: no SNI presented in handshake\n");
else
debug_printf("TLS failure: gnutls_server_name_get(): %s [%d]\n",
gnutls_strerror(rc), rc);
a TLS session.
Arguments:
- require_ciphers list of allowed ciphers or NULL
errstr pointer to error string
Returns: OK on success
*/
int
-tls_server_start(const uschar * require_ciphers, uschar ** errstr)
+tls_server_start(uschar ** errstr)
{
int rc;
exim_gnutls_state_st * state = NULL;
gettimeofday(&t0, NULL);
#endif
- if ((rc = tls_init(NULL, tls_certificate, tls_privatekey,
- NULL, tls_verify_certificates, tls_crl,
- require_ciphers, &state, &tls_in, errstr)) != OK) return rc;
+ if ((rc = tls_init(NULL, NULL,
+ tls_require_ciphers, &state, &tls_in, errstr)) != OK) return rc;
#ifdef MEASURE_TIMING
report_time_since(&t0, US"server tls_init (delta)");
if (verify_check_host(&tls_verify_hosts) == OK)
{
DEBUG(D_tls)
- debug_printf("TLS: a client certificate will be required.\n");
+ debug_printf("TLS: a client certificate will be required\n");
state->verify_requirement = VERIFY_REQUIRED;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE);
}
else if (verify_check_host(&tls_try_verify_hosts) == OK)
{
DEBUG(D_tls)
- debug_printf("TLS: a client certificate will be requested but not required.\n");
+ debug_printf("TLS: a client certificate will be requested but not required\n");
state->verify_requirement = VERIFY_OPTIONAL;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST);
}
else
{
DEBUG(D_tls)
- debug_printf("TLS: a client certificate will not be requested.\n");
+ debug_printf("TLS: a client certificate will not be requested\n");
state->verify_requirement = VERIFY_NONE;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE);
}
{
state->event_action = event_action;
gnutls_session_set_ptr(state->session, state);
- gnutls_certificate_set_verify_function(state->x509_cred, verify_cb);
+ gnutls_certificate_set_verify_function(state->lib_state.x509_cred, verify_cb);
}
#endif
tls_error_gnu(US"gnutls_handshake", rc, NULL, errstr);
(void) gnutls_alert_send_appropriate(state->session, rc);
gnutls_deinit(state->session);
- gnutls_certificate_free_credentials(state->x509_cred);
+ gnutls_certificate_free_credentials(state->lib_state.x509_cred);
+ state->lib_state = null_tls_preload;
millisleep(500);
shutdown(state->fd_out, SHUT_WR);
for (int i = 1024; fgetc(smtp_in) != EOF && i > 0; ) i--; /* drain skt */
host->certname;
#endif
DEBUG(D_tls)
- debug_printf("TLS: server cert verification includes hostname: \"%s\".\n",
+ debug_printf("TLS: server cert verification includes hostname: \"%s\"\n",
state->exp_tls_verify_cert_hostnames);
}
}
if (conn_args->dane && ob->dane_require_tls_ciphers)
{
- /* not using expand_check_tlsvar because not yet in state */
+ /* not using Expand_check_tlsvar because not yet in state */
if (!expand_check(ob->dane_require_tls_ciphers, US"dane_require_tls_ciphers",
&cipher_list, errstr))
return FALSE;
gettimeofday(&t0, NULL);
#endif
- if (tls_init(host, ob->tls_certificate, ob->tls_privatekey,
- ob->tls_sni, ob->tls_verify_certificates, ob->tls_crl,
- cipher_list, &state, tlsp, errstr) != OK)
+ if (tls_init(host, ob, cipher_list, &state, tlsp, errstr) != OK)
return FALSE;
#ifdef MEASURE_TIMING
if (conn_args->dane && dane_tlsa_load(state, &conn_args->tlsa_dnsa))
{
DEBUG(D_tls)
- debug_printf("TLS: server certificate DANE required.\n");
+ debug_printf("TLS: server certificate DANE required\n");
state->verify_requirement = VERIFY_DANE;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE);
}
{
tls_client_setup_hostname_checks(host, state, ob);
DEBUG(D_tls)
- debug_printf("TLS: server certificate verification required.\n");
+ debug_printf("TLS: server certificate verification required\n");
state->verify_requirement = VERIFY_REQUIRED;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE);
}
{
tls_client_setup_hostname_checks(host, state, ob);
DEBUG(D_tls)
- debug_printf("TLS: server certificate verification optional.\n");
+ debug_printf("TLS: server certificate verification optional\n");
state->verify_requirement = VERIFY_OPTIONAL;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST);
}
else
{
DEBUG(D_tls)
- debug_printf("TLS: server certificate verification not required.\n");
+ debug_printf("TLS: server certificate verification not required\n");
state->verify_requirement = VERIFY_NONE;
gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE);
}
{
state->event_action = tb->event_action;
gnutls_session_set_ptr(state->session, state);
- gnutls_certificate_set_verify_function(state->x509_cred, verify_cb);
+ gnutls_certificate_set_verify_function(state->lib_state.x509_cred, verify_cb);
}
#endif
}
gnutls_deinit(state->session);
-gnutls_certificate_free_credentials(state->x509_cred);
+gnutls_certificate_free_credentials(state->lib_state.x509_cred);
+state->lib_state = null_tls_preload;
tlsp->active.sock = -1;
tlsp->active.tls_ctx = NULL;
if (state->xfer_buffer) store_free(state->xfer_buffer);
-memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init));
}
sigalrm_seen = FALSE;
if (smtp_receive_timeout > 0) ALARM(smtp_receive_timeout);
+errno = 0;
do
inbytes = gnutls_record_recv(state->session, state->xfer_buffer,
MIN(ssl_xfer_buffer_size, lim));
debug_printf("Calling gnutls_record_recv(session=%p, buffer=%p, len=" SIZE_T_FMT ")\n",
state->session, buff, len);
+errno = 0;
do
inbytes = gnutls_record_recv(state->session, buff, len);
while (inbytes == GNUTLS_E_AGAIN);
DEBUG(D_tls) debug_printf("gnutls_record_send(session=%p, buffer=%p, left=" SIZE_T_FMT ")\n",
state->session, buff, left);
+ errno = 0;
do
outbytes = gnutls_record_send(state->session, buff, left);
while (outbytes == GNUTLS_E_AGAIN);
i = gnutls_rnd(GNUTLS_RND_NONCE, smallbuf, needed_len);
if (i < 0)
{
- DEBUG(D_all) debug_printf("gnutls_rnd() failed, using fallback.\n");
+ DEBUG(D_all) debug_printf("gnutls_rnd() failed, using fallback\n");
return vaguely_random_number_fallback(max);
}
r = 0;
git://git.exim.org / exim.git / blobdiff