static int
setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional,
- int (*cert_vfy_cb)(int, X509_STORE_CTX *) );
+ int (*cert_vfy_cb)(int, X509_STORE_CTX *), uschar ** errstr );
/* Callbacks */
#ifdef EXIM_HAVE_OPENSSL_TLSEXT
host NULL if setting up a server;
the connected host if setting up a client
msg error message or NULL if we should ask OpenSSL
+ errstr pointer to output error message
Returns: OK/DEFER/FAIL
*/
static int
-tls_error(uschar * prefix, const host_item * host, uschar * msg)
+tls_error(uschar * prefix, const host_item * host, uschar * msg, uschar ** errstr)
{
if (!msg)
{
ERR_error_string(ERR_get_error(), ssl_errstring);
- msg = (uschar *)ssl_errstring;
+ msg = US ssl_errstring;
}
-if (host)
- {
- log_write(0, LOG_MAIN, "H=%s [%s] TLS error on connection (%s): %s",
- host->name, host->address, prefix, msg);
- return FAIL;
- }
-else
- {
- uschar *conn_info = smtp_get_connection_info();
- if (Ustrncmp(conn_info, US"SMTP ", 5) == 0)
- conn_info += 5;
- /* I'd like to get separated H= here, but too hard for now */
- log_write(0, LOG_MAIN, "TLS error on %s (%s): %s",
- conn_info, prefix, msg);
- return DEFER;
- }
+if (errstr) *errstr = string_sprintf("(%s): %s", prefix, msg);
+return host ? FAIL : DEFER;
}
sctx The current SSL CTX (inbound or outbound)
dhparam DH parameter file or fixed parameter identity string
host connected host, if client; NULL if server
+ errstr error string pointer
Returns: TRUE if OK (nothing to set up, or setup worked)
*/
static BOOL
-init_dh(SSL_CTX *sctx, uschar *dhparam, const host_item *host)
+init_dh(SSL_CTX *sctx, uschar *dhparam, const host_item *host, uschar ** errstr)
{
BIO *bio;
DH *dh;
uschar *dhexpanded;
const char *pem;
-if (!expand_check(dhparam, US"tls_dhparam", &dhexpanded))
+if (!expand_check(dhparam, US"tls_dhparam", &dhexpanded, errstr))
return FALSE;
if (!dhexpanded || !*dhexpanded)
if (!(bio = BIO_new_file(CS dhexpanded, "r")))
{
tls_error(string_sprintf("could not read dhparams file %s", dhexpanded),
- host, US strerror(errno));
+ host, US strerror(errno), errstr);
return FALSE;
}
}
if (!(pem = std_dh_prime_named(dhexpanded)))
{
tls_error(string_sprintf("Unknown standard DH prime \"%s\"", dhexpanded),
- host, US strerror(errno));
+ host, US strerror(errno), errstr);
return FALSE;
}
bio = BIO_new_mem_buf(CS pem, -1);
{
BIO_free(bio);
tls_error(string_sprintf("Could not read tls_dhparams \"%s\"", dhexpanded),
- host, NULL);
+ host, NULL, errstr);
return FALSE;
}
Arguments:
sctx The current SSL CTX (inbound or outbound)
host connected host, if client; NULL if server
+ errstr error string pointer
Returns: TRUE if OK (nothing to set up, or setup worked)
*/
static BOOL
-init_ecdh(SSL_CTX * sctx, host_item * host)
+init_ecdh(SSL_CTX * sctx, host_item * host, uschar ** errstr)
{
#ifdef OPENSSL_NO_ECDH
return TRUE;
return TRUE;
# else
-if (!expand_check(tls_eccurve, US"tls_eccurve", &exp_curve))
+if (!expand_check(tls_eccurve, US"tls_eccurve", &exp_curve, errstr))
return FALSE;
if (!exp_curve || !*exp_curve)
return TRUE;
# endif
)
{
- tls_error(string_sprintf("Unknown curve name tls_eccurve '%s'",
- exp_curve),
- host, NULL);
+ tls_error(string_sprintf("Unknown curve name tls_eccurve '%s'", exp_curve),
+ host, NULL, errstr);
return FALSE;
}
if (!(ecdh = EC_KEY_new_by_curve_name(nid)))
{
- tls_error(US"Unable to create ec curve", host, NULL);
+ tls_error(US"Unable to create ec curve", host, NULL, errstr);
return FALSE;
}
not to the stability of the interface. */
if ((rv = SSL_CTX_set_tmp_ecdh(sctx, ecdh) == 0))
- tls_error(string_sprintf("Error enabling '%s' curve", exp_curve), host, NULL);
+ tls_error(string_sprintf("Error enabling '%s' curve", exp_curve), host, NULL, errstr);
else
DEBUG(D_tls) debug_printf("ECDH: enabled '%s' curve\n", exp_curve);
/* Create and install a selfsigned certificate, for use in server mode */
static int
-tls_install_selfsign(SSL_CTX * sctx)
+tls_install_selfsign(SSL_CTX * sctx, uschar ** errstr)
{
X509 * x509 = NULL;
EVP_PKEY * pkey;
return OK;
err:
- (void) tls_error(where, NULL, NULL);
+ (void) tls_error(where, NULL, NULL, errstr);
if (x509) X509_free(x509);
if (pkey) EVP_PKEY_free(pkey);
return DEFER;
Arguments:
sctx the SSL_CTX* to update
cbinfo various parts of session state
+ errstr error string pointer
Returns: OK/DEFER/FAIL
*/
static int
-tls_expand_session_files(SSL_CTX *sctx, tls_ext_ctx_cb *cbinfo)
+tls_expand_session_files(SSL_CTX *sctx, tls_ext_ctx_cb *cbinfo,
+ uschar ** errstr)
{
uschar *expanded;
if (cbinfo->host) /* client */
return OK;
/* server */
- if (tls_install_selfsign(sctx) != OK)
+ if (tls_install_selfsign(sctx, errstr) != OK)
return DEFER;
}
else
)
reexpand_tls_files_for_sni = TRUE;
- if (!expand_check(cbinfo->certificate, US"tls_certificate", &expanded))
+ if (!expand_check(cbinfo->certificate, US"tls_certificate", &expanded, errstr))
return DEFER;
if (expanded != NULL)
if (!SSL_CTX_use_certificate_chain_file(sctx, CS expanded))
return tls_error(string_sprintf(
"SSL_CTX_use_certificate_chain_file file=%s", expanded),
- cbinfo->host, NULL);
+ cbinfo->host, NULL, errstr);
}
if (cbinfo->privatekey != NULL &&
- !expand_check(cbinfo->privatekey, US"tls_privatekey", &expanded))
+ !expand_check(cbinfo->privatekey, US"tls_privatekey", &expanded, errstr))
return DEFER;
/* If expansion was forced to fail, key_expanded will be NULL. If the result
DEBUG(D_tls) debug_printf("tls_privatekey file %s\n", expanded);
if (!SSL_CTX_use_PrivateKey_file(sctx, CS expanded, SSL_FILETYPE_PEM))
return tls_error(string_sprintf(
- "SSL_CTX_use_PrivateKey_file file=%s", expanded), cbinfo->host, NULL);
+ "SSL_CTX_use_PrivateKey_file file=%s", expanded), cbinfo->host, NULL, errstr);
}
}
#ifndef DISABLE_OCSP
if (cbinfo->is_server && cbinfo->u_ocsp.server.file)
{
- if (!expand_check(cbinfo->u_ocsp.server.file, US"tls_ocsp_file", &expanded))
+ if (!expand_check(cbinfo->u_ocsp.server.file, US"tls_ocsp_file", &expanded, errstr))
return DEFER;
if (expanded && *expanded)
tls_ext_ctx_cb *cbinfo = (tls_ext_ctx_cb *) arg;
int rc;
int old_pool = store_pool;
+uschar * dummy_errstr;
if (!servername)
return SSL_TLSEXT_ERR_OK;
SSL_CTX_set_tlsext_servername_callback(server_sni, tls_servername_cb);
SSL_CTX_set_tlsext_servername_arg(server_sni, cbinfo);
-if ( !init_dh(server_sni, cbinfo->dhparam, NULL)
- || !init_ecdh(server_sni, NULL)
+if ( !init_dh(server_sni, cbinfo->dhparam, NULL, &dummy_errstr)
+ || !init_ecdh(server_sni, NULL, &dummy_errstr)
)
return SSL_TLSEXT_ERR_NOACK;
#endif
if ((rc = setup_certs(server_sni, tls_verify_certificates, tls_crl, NULL, FALSE,
- verify_callback_server)) != OK)
+ verify_callback_server, &dummy_errstr)) != OK)
return SSL_TLSEXT_ERR_NOACK;
/* do this after setup_certs, because this can require the certs for verifying
OCSP information. */
-if ((rc = tls_expand_session_files(server_sni, cbinfo)) != OK)
+if ((rc = tls_expand_session_files(server_sni, cbinfo, &dummy_errstr)) != OK)
return SSL_TLSEXT_ERR_NOACK;
DEBUG(D_tls) debug_printf("Switching SSL context.\n");
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
+ errstr error string pointer
Returns: OK/DEFER/FAIL
*/
#ifndef DISABLE_OCSP
uschar *ocsp_file,
#endif
- address_item *addr, tls_ext_ctx_cb ** cbp)
+ address_item *addr, tls_ext_ctx_cb ** cbp, uschar ** errstr)
{
long init_options;
int rc;
*ctxp = SSL_CTX_new(host ? SSLv23_client_method() : SSLv23_server_method());
-if (!*ctxp) return tls_error(US"SSL_CTX_new", host, NULL);
+if (!*ctxp) return tls_error(US"SSL_CTX_new", host, NULL, errstr);
/* It turns out that we need to seed the random number generator this early in
order to get the full complement of ciphers to work. It took me roughly a day
if (!RAND_status())
return tls_error(US"RAND_status", host,
- US"unable to seed random number generator");
+ US"unable to seed random number generator", errstr);
}
/* Set up the information callback, which outputs if debugging is at a suitable
okay = tls_openssl_options_parse(openssl_options, &init_options);
if (!okay)
- return tls_error(US"openssl_options parsing failed", host, NULL);
+ return tls_error(US"openssl_options parsing failed", host, NULL, errstr);
if (init_options)
{
DEBUG(D_tls) debug_printf("setting SSL CTX options: %#lx\n", init_options);
if (!(SSL_CTX_set_options(*ctxp, init_options)))
return tls_error(string_sprintf(
- "SSL_CTX_set_option(%#lx)", init_options), host, NULL);
+ "SSL_CTX_set_option(%#lx)", init_options), host, NULL, errstr);
}
else
DEBUG(D_tls) debug_printf("no SSL CTX options to set\n");
/* Initialize with DH parameters if supplied */
/* Initialize ECDH temp key parameter selection */
-if ( !init_dh(*ctxp, dhparam, host)
- || !init_ecdh(*ctxp, host)
+if ( !init_dh(*ctxp, dhparam, host, errstr)
+ || !init_ecdh(*ctxp, host, errstr)
)
return DEFER;
/* Set up certificate and key (and perhaps OCSP info) */
-if ((rc = tls_expand_session_files(*ctxp, cbinfo)) != OK)
+if ((rc = tls_expand_session_files(*ctxp, cbinfo, errstr)) != OK)
return rc;
/* If we need to handle SNI or OCSP, do so */
optional TRUE if called from a server for a host in tls_try_verify_hosts;
otherwise passed as FALSE
cert_vfy_cb Callback function for certificate verification
+ errstr error string pointer
Returns: OK/DEFER/FAIL
*/
static int
setup_certs(SSL_CTX *sctx, uschar *certs, uschar *crl, host_item *host, BOOL optional,
- int (*cert_vfy_cb)(int, X509_STORE_CTX *) )
+ int (*cert_vfy_cb)(int, X509_STORE_CTX *), uschar ** errstr)
{
uschar *expcerts, *expcrl;
-if (!expand_check(certs, US"tls_verify_certificates", &expcerts))
+if (!expand_check(certs, US"tls_verify_certificates", &expcerts, errstr))
return DEFER;
if (expcerts && *expcerts)
CA bundle. Then add the ones specified in the config, if any. */
if (!SSL_CTX_set_default_verify_paths(sctx))
- return tls_error(US"SSL_CTX_set_default_verify_paths", host, NULL);
+ return tls_error(US"SSL_CTX_set_default_verify_paths", host, NULL, errstr);
if (Ustrcmp(expcerts, "system") != 0)
{
if ( (!file || statbuf.st_size > 0)
&& !SSL_CTX_load_verify_locations(sctx, CS file, CS dir))
- return tls_error(US"SSL_CTX_load_verify_locations", host, NULL);
+ return tls_error(US"SSL_CTX_load_verify_locations", host, NULL, errstr);
/* Load the list of CAs for which we will accept certs, for sending
to the client. This is only for the one-file tls_verify_certificates
OpenSSL will then handle the verify against CA certs and CRLs by
itself in the verify callback." */
- if (!expand_check(crl, US"tls_crl", &expcrl)) return DEFER;
+ if (!expand_check(crl, US"tls_crl", &expcrl, errstr)) return DEFER;
if (expcrl && *expcrl)
{
struct stat statbufcrl;
DEBUG(D_tls) debug_printf("SSL CRL value is a file %s\n", file);
}
if (X509_STORE_load_locations(cvstore, CS file, CS dir) == 0)
- return tls_error(US"X509_STORE_load_locations", host, NULL);
+ return tls_error(US"X509_STORE_load_locations", host, NULL, errstr);
/* setting the flags to check against the complete crl chain */
Arguments:
require_ciphers allowed ciphers
+ errstr pointer to error message
Returns: OK on success
DEFER for errors before the start of the negotiation
*/
int
-tls_server_start(const uschar *require_ciphers)
+tls_server_start(const uschar * require_ciphers, uschar ** errstr)
{
int rc;
-uschar *expciphers;
-tls_ext_ctx_cb *cbinfo;
+uschar * expciphers;
+tls_ext_ctx_cb * cbinfo;
static uschar peerdn[256];
static uschar cipherbuf[256];
if (tls_in.active >= 0)
{
- tls_error(US"STARTTLS received after TLS started", NULL, US"");
+ tls_error(US"STARTTLS received after TLS started", NULL, US"", errstr);
smtp_printf("554 Already in TLS\r\n");
return FAIL;
}
#ifndef DISABLE_OCSP
tls_ocsp_file,
#endif
- NULL, &server_static_cbinfo);
+ NULL, &server_static_cbinfo, errstr);
if (rc != OK) return rc;
cbinfo = server_static_cbinfo;
-if (!expand_check(require_ciphers, US"tls_require_ciphers", &expciphers))
+if (!expand_check(require_ciphers, US"tls_require_ciphers", &expciphers, errstr))
return FAIL;
/* In OpenSSL, cipher components are separated by hyphens. In GnuTLS, they
while (*s != 0) { if (*s == '_') *s = '-'; s++; }
DEBUG(D_tls) debug_printf("required ciphers: %s\n", expciphers);
if (!SSL_CTX_set_cipher_list(server_ctx, CS expciphers))
- return tls_error(US"SSL_CTX_set_cipher_list", NULL, NULL);
+ return tls_error(US"SSL_CTX_set_cipher_list", NULL, NULL, errstr);
cbinfo->server_cipher_list = expciphers;
}
if (verify_check_host(&tls_verify_hosts) == OK)
{
rc = setup_certs(server_ctx, tls_verify_certificates, tls_crl, NULL,
- FALSE, verify_callback_server);
+ FALSE, verify_callback_server, errstr);
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, verify_callback_server);
+ TRUE, verify_callback_server, errstr);
if (rc != OK) return rc;
server_verify_optional = TRUE;
}
/* Prepare for new connection */
-if (!(server_ssl = SSL_new(server_ctx))) return tls_error(US"SSL_new", NULL, NULL);
+if (!(server_ssl = SSL_new(server_ctx)))
+ return tls_error(US"SSL_new", NULL, NULL, errstr);
/* Warning: we used to SSL_clear(ssl) here, it was removed.
*
if (rc <= 0)
{
- tls_error(US"SSL_accept", NULL, sigalrm_seen ? US"timed out" : NULL);
- if (ERR_get_error() == 0)
- log_write(0, LOG_MAIN,
- "TLS client disconnected cleanly (rejected our certificate?)");
+ (void) tls_error(US"SSL_accept", NULL, sigalrm_seen ? US"timed out" : NULL, errstr);
return FAIL;
}
static int
tls_client_basic_ctx_init(SSL_CTX * ctx,
- host_item * host, smtp_transport_options_block * ob, tls_ext_ctx_cb * cbinfo
- )
+ host_item * host, smtp_transport_options_block * ob, tls_ext_ctx_cb * cbinfo,
+ uschar ** errstr)
{
int rc;
/* stick to the old behaviour for compatibility if tls_verify_certificates is
return OK;
if ((rc = setup_certs(ctx, ob->tls_verify_certificates,
- ob->tls_crl, host, client_verify_optional, verify_callback_client)) != OK)
+ ob->tls_crl, host, client_verify_optional, verify_callback_client,
+ errstr)) != OK)
return rc;
if (verify_check_given_host(&ob->tls_verify_cert_hostnames, host) == OK)
#ifdef EXPERIMENTAL_DANE
static int
-dane_tlsa_load(SSL * ssl, host_item * host, dns_answer * dnsa)
+dane_tlsa_load(SSL * ssl, host_item * host, dns_answer * dnsa, uschar ** errstr)
{
dns_record * rr;
dns_scan dnss;
int found = 0;
if (DANESSL_init(ssl, NULL, hostnames) != 1)
- return tls_error(US"hostnames load", host, NULL);
+ return tls_error(US"hostnames load", host, NULL, errstr);
for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
switch (DANESSL_add_tlsa(ssl, usage, selector, mdname, p, rr->size - 3))
{
default:
- return tls_error(US"tlsa load", host, NULL);
+ return tls_error(US"tlsa load", host, NULL, errstr);
case 0: /* action not taken */
case 1: break;
}
addr the first address
tb transport (always smtp)
tlsa_dnsa tlsa lookup, if DANE, else null
+ errstr error string pointer
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,
- transport_instance *tb
+ transport_instance * tb,
#ifdef EXPERIMENTAL_DANE
- , dns_answer * tlsa_dnsa
+ dns_answer * tlsa_dnsa,
#endif
- )
+ uschar ** errstr)
{
smtp_transport_options_block * ob =
(smtp_transport_options_block *)tb->options_block;
#ifndef DISABLE_OCSP
(void *)(long)request_ocsp,
#endif
- addr, &client_static_cbinfo);
+ addr, &client_static_cbinfo, errstr);
if (rc != OK) return rc;
tls_out.certificate_verified = FALSE;
client_verify_callback_called = FALSE;
if (!expand_check(ob->tls_require_ciphers, US"tls_require_ciphers",
- &expciphers))
+ &expciphers, errstr))
return FAIL;
/* In OpenSSL, cipher components are separated by hyphens. In GnuTLS, they
are separated by underscores. So that I can use either form in my tests, and
also for general convenience, we turn underscores into hyphens here. */
-if (expciphers != NULL)
+if (expciphers)
{
uschar *s = expciphers;
- while (*s != 0) { if (*s == '_') *s = '-'; s++; }
+ while (*s) { if (*s == '_') *s = '-'; s++; }
DEBUG(D_tls) debug_printf("required ciphers: %s\n", expciphers);
if (!SSL_CTX_set_cipher_list(client_ctx, CS expciphers))
- return tls_error(US"SSL_CTX_set_cipher_list", host, NULL);
+ return tls_error(US"SSL_CTX_set_cipher_list", host, NULL, errstr);
}
#ifdef EXPERIMENTAL_DANE
verify_callback_client_dane);
if (!DANESSL_library_init())
- return tls_error(US"library init", host, NULL);
+ return tls_error(US"library init", host, NULL, errstr);
if (DANESSL_CTX_init(client_ctx) <= 0)
- return tls_error(US"context init", host, NULL);
+ return tls_error(US"context init", host, NULL, errstr);
}
else
#endif
- if ((rc = tls_client_basic_ctx_init(client_ctx, host, ob, client_static_cbinfo))
- != OK)
+ if ((rc = tls_client_basic_ctx_init(client_ctx, host, ob,
+ client_static_cbinfo, errstr)) != OK)
return rc;
if ((client_ssl = SSL_new(client_ctx)) == NULL)
- return tls_error(US"SSL_new", host, NULL);
+ return tls_error(US"SSL_new", host, NULL, errstr);
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 (ob->tls_sni)
{
- if (!expand_check(ob->tls_sni, US"tls_sni", &tls_out.sni))
+ if (!expand_check(ob->tls_sni, US"tls_sni", &tls_out.sni, errstr))
return FAIL;
- if (tls_out.sni == NULL)
+ if (!tls_out.sni)
{
DEBUG(D_tls) debug_printf("Setting TLS SNI forced to fail, not sending\n");
}
#ifdef EXPERIMENTAL_DANE
if (tlsa_dnsa)
- if ((rc = dane_tlsa_load(client_ssl, host, tlsa_dnsa)) != OK)
+ if ((rc = dane_tlsa_load(client_ssl, host, tlsa_dnsa, errstr)) != OK)
return rc;
#endif
#endif
if (rc <= 0)
- return tls_error(US"SSL_connect", host, sigalrm_seen ? US"timed out" : NULL);
+ return tls_error(US"SSL_connect", host, sigalrm_seen ? US"timed out" : NULL,
+ errstr);
DEBUG(D_tls) debug_printf("SSL_connect succeeded\n");
if (!(tls_require_ciphers && *tls_require_ciphers))
return NULL;
-if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers))
+if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers,
+ &err))
return US"failed to expand tls_require_ciphers";
if (!(expciphers && *expciphers))
if (!SSL_CTX_set_cipher_list(ctx, CS expciphers))
{
ERR_error_string(ERR_get_error(), ssl_errstring);
- err = string_sprintf("SSL_CTX_set_cipher_list(%s) failed", expciphers);
+ err = string_sprintf("SSL_CTX_set_cipher_list(%s) failed: %s",
+ expciphers, ssl_errstring);
}
SSL_CTX_free(ctx);
projects / exim.git / blobdiff