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curl/lib/cyassl.c

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C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/*
* Source file for all CyaSSL-specific code for the TLS/SSL layer. No code
* but sslgen.c should ever call or use these functions.
*
*/
#include "setup.h"
#ifdef USE_CYASSL
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "cyassl.h"
#include "sslgen.h"
#include "parsedate.h"
#include "connect.h" /* for the connect timeout */
#include "select.h"
#include "rawstr.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
static Curl_recv cyassl_recv;
static Curl_send cyassl_send;
static int do_file_type(const char *type)
{
if(!type || !type[0])
return SSL_FILETYPE_PEM;
if(Curl_raw_equal(type, "PEM"))
return SSL_FILETYPE_PEM;
if(Curl_raw_equal(type, "DER"))
return SSL_FILETYPE_ASN1;
return -1;
}
/*
* This function loads all the client/CA certificates and CRLs. Setup the TLS
* layer and do all necessary magic.
*/
static CURLcode
cyassl_connect_step1(struct connectdata *conn,
int sockindex)
{
struct SessionHandle *data = conn->data;
struct ssl_connect_data* conssl = &conn->ssl[sockindex];
SSL_METHOD* req_method = NULL;
void* ssl_sessionid = NULL;
curl_socket_t sockfd = conn->sock[sockindex];
if(conssl->state == ssl_connection_complete)
return CURLE_OK;
/* CyaSSL doesn't support SSLv2 */
if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
failf(data, "CyaSSL does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
/* check to see if we've been told to use an explicit SSL/TLS version */
switch(data->set.ssl.version) {
case CURL_SSLVERSION_DEFAULT:
/* we try to figure out version */
req_method = SSLv23_client_method();
break;
case CURL_SSLVERSION_TLSv1:
req_method = TLSv1_client_method();
break;
case CURL_SSLVERSION_SSLv3:
req_method = SSLv3_client_method();
break;
default:
req_method = TLSv1_client_method();
}
if(!req_method) {
failf(data, "SSL: couldn't create a method!");
return CURLE_OUT_OF_MEMORY;
}
if(conssl->ctx)
SSL_CTX_free(conssl->ctx);
conssl->ctx = SSL_CTX_new(req_method);
if(!conssl->ctx) {
failf(data, "SSL: couldn't create a context!");
return CURLE_OUT_OF_MEMORY;
}
#ifndef NO_FILESYSTEM
/* load trusted cacert */
if(data->set.str[STRING_SSL_CAFILE]) {
if(!SSL_CTX_load_verify_locations(conssl->ctx,
data->set.str[STRING_SSL_CAFILE],
data->set.str[STRING_SSL_CAPATH])) {
if(data->set.ssl.verifypeer) {
/* Fail if we insiste on successfully verifying the server. */
failf(data,"error setting certificate verify locations:\n"
" CAfile: %s\n CApath: %s\n",
data->set.str[STRING_SSL_CAFILE]?
data->set.str[STRING_SSL_CAFILE]: "none",
data->set.str[STRING_SSL_CAPATH]?
data->set.str[STRING_SSL_CAPATH] : "none");
return CURLE_SSL_CACERT_BADFILE;
}
else {
/* Just continue with a warning if no strict certificate
verification is required. */
infof(data, "error setting certificate verify locations,"
" continuing anyway:\n");
}
}
else {
/* Everything is fine. */
infof(data, "successfully set certificate verify locations:\n");
}
infof(data,
" CAfile: %s\n"
" CApath: %s\n",
data->set.str[STRING_SSL_CAFILE] ? data->set.str[STRING_SSL_CAFILE]:
"none",
data->set.str[STRING_SSL_CAPATH] ? data->set.str[STRING_SSL_CAPATH]:
"none");
}
/* Load the client certificate, and private key */
if(data->set.str[STRING_CERT] && data->set.str[STRING_KEY]) {
int file_type = do_file_type(data->set.str[STRING_CERT_TYPE]);
if(SSL_CTX_use_certificate_file(conssl->ctx, data->set.str[STRING_CERT],
file_type) != 1) {
failf(data, "unable to use client certificate (no key or wrong pass"
" phrase?)");
return CURLE_SSL_CONNECT_ERROR;
}
file_type = do_file_type(data->set.str[STRING_KEY_TYPE]);
if(SSL_CTX_use_PrivateKey_file(conssl->ctx, data->set.str[STRING_KEY],
file_type) != 1) {
failf(data, "unable to set private key");
return CURLE_SSL_CONNECT_ERROR;
}
}
#else
if(CyaSSL_no_filesystem_verify(conssl->ctx)!= SSL_SUCCESS) {
return CURLE_SSL_CONNECT_ERROR;
}
#endif /* NO_FILESYSTEM */
/* SSL always tries to verify the peer, this only says whether it should
* fail to connect if the verification fails, or if it should continue
* anyway. In the latter case the result of the verification is checked with
* SSL_get_verify_result() below. */
SSL_CTX_set_verify(conssl->ctx,
data->set.ssl.verifypeer?SSL_VERIFY_PEER:SSL_VERIFY_NONE,
NULL);
/* Let's make an SSL structure */
if(conssl->handle)
SSL_free(conssl->handle);
conssl->handle = SSL_new(conssl->ctx);
if(!conssl->handle) {
failf(data, "SSL: couldn't create a context (handle)!");
return CURLE_OUT_OF_MEMORY;
}
/* Check if there's a cached ID we can/should use here! */
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL)) {
/* we got a session id, use it! */
if(!SSL_set_session(conssl->handle, ssl_sessionid)) {
failf(data, "SSL: SSL_set_session failed: %s",
ERR_error_string(SSL_get_error(conssl->handle, 0),NULL));
return CURLE_SSL_CONNECT_ERROR;
}
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
/* pass the raw socket into the SSL layer */
if(!SSL_set_fd(conssl->handle, (int)sockfd)) {
failf(data, "SSL: SSL_set_fd failed");
return CURLE_SSL_CONNECT_ERROR;
}
conssl->connecting_state = ssl_connect_2;
return CURLE_OK;
}
static CURLcode
cyassl_connect_step2(struct connectdata *conn,
int sockindex)
{
int ret = -1;
struct SessionHandle *data = conn->data;
struct ssl_connect_data* conssl = &conn->ssl[sockindex];
infof(data, "CyaSSL: Connecting to %s:%d\n",
conn->host.name, conn->remote_port);
conn->recv[sockindex] = cyassl_recv;
conn->send[sockindex] = cyassl_send;
ret = SSL_connect(conssl->handle);
if(ret != 1) {
char error_buffer[80];
int detail = SSL_get_error(conssl->handle, ret);
if(SSL_ERROR_WANT_READ == detail) {
conssl->connecting_state = ssl_connect_2_reading;
return CURLE_OK;
}
if(SSL_ERROR_WANT_WRITE == detail) {
conssl->connecting_state = ssl_connect_2_writing;
return CURLE_OK;
}
failf(data, "SSL_connect failed with error %d: %s", detail,
ERR_error_string(detail, error_buffer));
return CURLE_SSL_CONNECT_ERROR;
}
conssl->connecting_state = ssl_connect_3;
infof(data, "SSL connected");
return CURLE_OK;
}
static CURLcode
cyassl_connect_step3(struct connectdata *conn,
int sockindex)
{
CURLcode retcode = CURLE_OK;
void *old_ssl_sessionid=NULL;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
int incache;
SSL_SESSION *our_ssl_sessionid;
DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
our_ssl_sessionid = SSL_get_session(connssl->handle);
incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL));
if(incache) {
if(old_ssl_sessionid != our_ssl_sessionid) {
infof(data, "old SSL session ID is stale, removing\n");
Curl_ssl_delsessionid(conn, old_ssl_sessionid);
incache = FALSE;
}
}
if(!incache) {
retcode = Curl_ssl_addsessionid(conn, our_ssl_sessionid,
0 /* unknown size */);
if(retcode) {
failf(data, "failed to store ssl session");
return retcode;
}
}
connssl->connecting_state = ssl_connect_done;
return retcode;
}
static ssize_t cyassl_send(struct connectdata *conn,
int sockindex,
const void *mem,
size_t len,
CURLcode *curlcode)
{
char error_buffer[80];
int memlen = (len > (size_t)INT_MAX) ? INT_MAX : (int)len;
int rc = SSL_write(conn->ssl[sockindex].handle, mem, memlen);
if(rc < 0) {
int err = SSL_get_error(conn->ssl[sockindex].handle, rc);
switch(err) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
/* there's data pending, re-invoke SSL_write() */
*curlcode = CURLE_AGAIN;
return -1;
default:
failf(conn->data, "SSL write: %s, errno %d",
ERR_error_string(err, error_buffer),
SOCKERRNO);
*curlcode = CURLE_SEND_ERROR;
return -1;
}
}
return rc;
}
void Curl_cyassl_close_all(struct SessionHandle *data)
{
(void)data;
}
void Curl_cyassl_close(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *conssl = &conn->ssl[sockindex];
if(conssl->handle) {
(void)SSL_shutdown(conssl->handle);
SSL_free (conssl->handle);
conssl->handle = NULL;
}
if(conssl->ctx) {
SSL_CTX_free (conssl->ctx);
conssl->ctx = NULL;
}
}
static ssize_t cyassl_recv(struct connectdata *conn,
int num,
char *buf,
size_t buffersize,
CURLcode *curlcode)
{
char error_buffer[80];
int buffsize = (buffersize > (size_t)INT_MAX) ? INT_MAX : (int)buffersize;
int nread = SSL_read(conn->ssl[num].handle, buf, buffsize);
if(nread < 0) {
int err = SSL_get_error(conn->ssl[num].handle, nread);
switch(err) {
case SSL_ERROR_ZERO_RETURN: /* no more data */
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
/* there's data pending, re-invoke SSL_read() */
*curlcode = CURLE_AGAIN;
return -1;
default:
failf(conn->data, "SSL read: %s, errno %d",
ERR_error_string(err, error_buffer),
SOCKERRNO);
*curlcode = CURLE_RECV_ERROR;
return -1;
}
}
return nread;
}
void Curl_cyassl_session_free(void *ptr)
{
(void)ptr;
/* CyaSSL reuses sessions on own, no free */
}
size_t Curl_cyassl_version(char *buffer, size_t size)
{
#ifdef CYASSL_VERSION
return snprintf(buffer, size, "CyaSSL/%s", CYASSL_VERSION);
#else
return snprintf(buffer, size, "CyaSSL/%s", "<1.8.8");
#endif
}
int Curl_cyassl_init(void)
{
InitCyaSSL();
return 1;
}
bool Curl_cyassl_data_pending(const struct connectdata* conn, int connindex)
{
if(conn->ssl[connindex].handle) /* SSL is in use */
return (bool)(0 != SSL_pending(conn->ssl[connindex].handle));
else
return FALSE;
}
/*
* This function is called to shut down the SSL layer but keep the
* socket open (CCC - Clear Command Channel)
*/
int Curl_cyassl_shutdown(struct connectdata *conn, int sockindex)
{
int retval = 0;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
if(connssl->handle) {
SSL_free (connssl->handle);
connssl->handle = NULL;
}
return retval;
}
static CURLcode
cyassl_connect_common(struct connectdata *conn,
int sockindex,
bool nonblocking,
bool *done)
{
CURLcode retcode;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
curl_socket_t sockfd = conn->sock[sockindex];
long timeout_ms;
int what;
/* check if the connection has already been established */
if(ssl_connection_complete == connssl->state) {
*done = TRUE;
return CURLE_OK;
}
if(ssl_connect_1==connssl->connecting_state) {
/* Find out how much more time we're allowed */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
retcode = cyassl_connect_step1(conn, sockindex);
if(retcode)
return retcode;
}
while(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == connssl->connecting_state) {
/* check allowed time left */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
/* if ssl is expecting something, check if it's available. */
if(connssl->connecting_state == ssl_connect_2_reading
|| connssl->connecting_state == ssl_connect_2_writing) {
curl_socket_t writefd = ssl_connect_2_writing==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
curl_socket_t readfd = ssl_connect_2_reading==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
if(what < 0) {
/* fatal error */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
return CURLE_SSL_CONNECT_ERROR;
}
else if(0 == what) {
if(nonblocking) {
*done = FALSE;
return CURLE_OK;
}
else {
/* timeout */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
}
/* socket is readable or writable */
}
/* Run transaction, and return to the caller if it failed or if
* this connection is part of a multi handle and this loop would
* execute again. This permits the owner of a multi handle to
* abort a connection attempt before step2 has completed while
* ensuring that a client using select() or epoll() will always
* have a valid fdset to wait on.
*/
retcode = cyassl_connect_step2(conn, sockindex);
if(retcode || (nonblocking &&
(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == connssl->connecting_state)))
return retcode;
} /* repeat step2 until all transactions are done. */
if(ssl_connect_3==connssl->connecting_state) {
retcode = cyassl_connect_step3(conn, sockindex);
if(retcode)
return retcode;
}
if(ssl_connect_done==connssl->connecting_state) {
connssl->state = ssl_connection_complete;
conn->recv[sockindex] = cyassl_recv;
conn->send[sockindex] = cyassl_send;
*done = TRUE;
}
else
*done = FALSE;
/* Reset our connect state machine */
connssl->connecting_state = ssl_connect_1;
return CURLE_OK;
}
CURLcode
Curl_cyassl_connect_nonblocking(struct connectdata *conn,
int sockindex,
bool *done)
{
return cyassl_connect_common(conn, sockindex, TRUE, done);
}
CURLcode
Curl_cyassl_connect(struct connectdata *conn,
int sockindex)
{
CURLcode retcode;
bool done = FALSE;
retcode = cyassl_connect_common(conn, sockindex, FALSE, &done);
if(retcode)
return retcode;
DEBUGASSERT(done);
return CURLE_OK;
}
#endif
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