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482 lines
13 KiB
C
482 lines
13 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* This file is for implementing all "generic" SSL functions that all libcurl
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internals should use. It is then responsible for calling the proper
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"backend" function.
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SSL-functions in libcurl should call functions in this source file, and not
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to any specific SSL-layer.
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Curl_ssl_ - prefix for generic ones
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Curl_ossl_ - prefix for OpenSSL ones
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Curl_gtls_ - prefix for GnuTLS ones
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Curl_nss_ - prefix for NSS ones
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Curl_polarssl_ - prefix for PolarSSL ones
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Curl_cyassl_ - prefix for CyaSSL ones
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Note that this source code uses curlssl_* functions, and they are all
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defines/macros #defined by the lib-specific header files.
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"SSL/TLS Strong Encryption: An Introduction"
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http://httpd.apache.org/docs-2.0/ssl/ssl_intro.html
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*/
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#include "setup.h"
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include "urldata.h"
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#define SSLGEN_C
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#include "sslgen.h" /* generic SSL protos etc */
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#include "ssluse.h" /* OpenSSL versions */
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#include "gtls.h" /* GnuTLS versions */
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#include "nssg.h" /* NSS versions */
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#include "qssl.h" /* QSOSSL versions */
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#include "polarssl.h" /* PolarSSL versions */
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#include "axtls.h" /* axTLS versions */
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#include "cyassl.h" /* CyaSSL versions */
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#include "sendf.h"
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#include "rawstr.h"
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#include "url.h"
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#include "curl_memory.h"
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#include "progress.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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static bool safe_strequal(char* str1, char* str2)
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{
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if(str1 && str2)
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/* both pointers point to something then compare them */
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return (bool)(0 != Curl_raw_equal(str1, str2));
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else
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/* if both pointers are NULL then treat them as equal */
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return (bool)(!str1 && !str2);
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}
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bool
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Curl_ssl_config_matches(struct ssl_config_data* data,
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struct ssl_config_data* needle)
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{
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if((data->version == needle->version) &&
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(data->verifypeer == needle->verifypeer) &&
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(data->verifyhost == needle->verifyhost) &&
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safe_strequal(data->CApath, needle->CApath) &&
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safe_strequal(data->CAfile, needle->CAfile) &&
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safe_strequal(data->random_file, needle->random_file) &&
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safe_strequal(data->egdsocket, needle->egdsocket) &&
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safe_strequal(data->cipher_list, needle->cipher_list))
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return TRUE;
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return FALSE;
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}
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bool
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Curl_clone_ssl_config(struct ssl_config_data *source,
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struct ssl_config_data *dest)
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{
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dest->sessionid = source->sessionid;
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dest->verifyhost = source->verifyhost;
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dest->verifypeer = source->verifypeer;
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dest->version = source->version;
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if(source->CAfile) {
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dest->CAfile = strdup(source->CAfile);
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if(!dest->CAfile)
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return FALSE;
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}
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else
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dest->CAfile = NULL;
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if(source->CApath) {
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dest->CApath = strdup(source->CApath);
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if(!dest->CApath)
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return FALSE;
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}
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else
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dest->CApath = NULL;
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if(source->cipher_list) {
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dest->cipher_list = strdup(source->cipher_list);
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if(!dest->cipher_list)
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return FALSE;
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}
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else
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dest->cipher_list = NULL;
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if(source->egdsocket) {
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dest->egdsocket = strdup(source->egdsocket);
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if(!dest->egdsocket)
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return FALSE;
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}
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else
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dest->egdsocket = NULL;
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if(source->random_file) {
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dest->random_file = strdup(source->random_file);
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if(!dest->random_file)
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return FALSE;
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}
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else
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dest->random_file = NULL;
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return TRUE;
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}
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void Curl_free_ssl_config(struct ssl_config_data* sslc)
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{
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Curl_safefree(sslc->CAfile);
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Curl_safefree(sslc->CApath);
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Curl_safefree(sslc->cipher_list);
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Curl_safefree(sslc->egdsocket);
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Curl_safefree(sslc->random_file);
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}
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#ifdef USE_SSL
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/* "global" init done? */
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static bool init_ssl=FALSE;
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/**
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* Global SSL init
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*
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* @retval 0 error initializing SSL
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* @retval 1 SSL initialized successfully
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*/
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int Curl_ssl_init(void)
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{
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/* make sure this is only done once */
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if(init_ssl)
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return 1;
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init_ssl = TRUE; /* never again */
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return curlssl_init();
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}
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/* Global cleanup */
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void Curl_ssl_cleanup(void)
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{
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if(init_ssl) {
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/* only cleanup if we did a previous init */
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curlssl_cleanup();
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init_ssl = FALSE;
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}
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}
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CURLcode
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Curl_ssl_connect(struct connectdata *conn, int sockindex)
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{
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CURLcode res;
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/* mark this is being ssl-enabled from here on. */
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conn->ssl[sockindex].use = TRUE;
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conn->ssl[sockindex].state = ssl_connection_negotiating;
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res = curlssl_connect(conn, sockindex);
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if(!res)
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Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
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return res;
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}
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CURLcode
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Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex,
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bool *done)
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{
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#ifdef curlssl_connect_nonblocking
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CURLcode res;
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/* mark this is being ssl requested from here on. */
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conn->ssl[sockindex].use = TRUE;
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res = curlssl_connect_nonblocking(conn, sockindex, done);
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if(!res && *done == TRUE)
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Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */
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return res;
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#else
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*done = TRUE; /* fallback to BLOCKING */
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conn->ssl[sockindex].use = TRUE;
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return curlssl_connect(conn, sockindex);
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#endif /* non-blocking connect support */
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}
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/*
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* Check if there's a session ID for the given connection in the cache, and if
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* there's one suitable, it is provided. Returns TRUE when no entry matched.
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*/
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int Curl_ssl_getsessionid(struct connectdata *conn,
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void **ssl_sessionid,
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size_t *idsize) /* set 0 if unknown */
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{
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struct curl_ssl_session *check;
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struct SessionHandle *data = conn->data;
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long i;
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if(!conn->ssl_config.sessionid)
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/* session ID re-use is disabled */
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return TRUE;
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for(i=0; i< data->set.ssl.numsessions; i++) {
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check = &data->state.session[i];
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if(!check->sessionid)
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/* not session ID means blank entry */
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continue;
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if(Curl_raw_equal(conn->host.name, check->name) &&
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(conn->remote_port == check->remote_port) &&
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Curl_ssl_config_matches(&conn->ssl_config, &check->ssl_config)) {
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/* yes, we have a session ID! */
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data->state.sessionage++; /* increase general age */
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check->age = data->state.sessionage; /* set this as used in this age */
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*ssl_sessionid = check->sessionid;
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if(idsize)
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*idsize = check->idsize;
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return FALSE;
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}
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}
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*ssl_sessionid = NULL;
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return TRUE;
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}
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/*
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* Kill a single session ID entry in the cache.
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*/
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static int kill_session(struct curl_ssl_session *session)
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{
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if(session->sessionid) {
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/* defensive check */
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/* free the ID the SSL-layer specific way */
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curlssl_session_free(session->sessionid);
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session->sessionid=NULL;
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session->age = 0; /* fresh */
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Curl_free_ssl_config(&session->ssl_config);
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Curl_safefree(session->name);
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session->name = NULL; /* no name */
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return 0; /* ok */
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}
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else
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return 1;
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}
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/*
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* Delete the given session ID from the cache.
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*/
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void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid)
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{
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int i;
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for(i=0; i< conn->data->set.ssl.numsessions; i++) {
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struct curl_ssl_session *check = &conn->data->state.session[i];
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if(check->sessionid == ssl_sessionid) {
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kill_session(check);
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break;
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}
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}
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}
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/*
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* Store session id in the session cache. The ID passed on to this function
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* must already have been extracted and allocated the proper way for the SSL
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* layer. Curl_XXXX_session_free() will be called to free/kill the session ID
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* later on.
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*/
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CURLcode Curl_ssl_addsessionid(struct connectdata *conn,
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void *ssl_sessionid,
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size_t idsize)
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{
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long i;
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struct SessionHandle *data=conn->data; /* the mother of all structs */
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struct curl_ssl_session *store = &data->state.session[0];
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long oldest_age=data->state.session[0].age; /* zero if unused */
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char *clone_host;
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/* Even though session ID re-use might be disabled, that only disables USING
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IT. We still store it here in case the re-using is again enabled for an
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upcoming transfer */
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clone_host = strdup(conn->host.name);
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if(!clone_host)
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return CURLE_OUT_OF_MEMORY; /* bail out */
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/* Now we should add the session ID and the host name to the cache, (remove
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the oldest if necessary) */
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/* find an empty slot for us, or find the oldest */
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for(i=1; (i<data->set.ssl.numsessions) &&
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data->state.session[i].sessionid; i++) {
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if(data->state.session[i].age < oldest_age) {
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oldest_age = data->state.session[i].age;
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store = &data->state.session[i];
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}
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}
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if(i == data->set.ssl.numsessions)
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/* cache is full, we must "kill" the oldest entry! */
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kill_session(store);
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else
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store = &data->state.session[i]; /* use this slot */
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/* now init the session struct wisely */
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store->sessionid = ssl_sessionid;
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store->idsize = idsize;
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store->age = data->state.sessionage; /* set current age */
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if(store->name)
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/* free it if there's one already present */
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free(store->name);
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store->name = clone_host; /* clone host name */
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store->remote_port = conn->remote_port; /* port number */
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if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) {
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store->sessionid = NULL; /* let caller free sessionid */
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free(clone_host);
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return CURLE_OUT_OF_MEMORY;
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}
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return CURLE_OK;
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}
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void Curl_ssl_close_all(struct SessionHandle *data)
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{
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long i;
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/* kill the session ID cache */
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if(data->state.session) {
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for(i=0; i< data->set.ssl.numsessions; i++)
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/* the single-killer function handles empty table slots */
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kill_session(&data->state.session[i]);
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/* free the cache data */
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free(data->state.session);
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data->state.session = NULL;
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}
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curlssl_close_all(data);
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}
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void Curl_ssl_close(struct connectdata *conn, int sockindex)
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{
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DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
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curlssl_close(conn, sockindex);
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}
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CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex)
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{
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if(curlssl_shutdown(conn, sockindex))
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return CURLE_SSL_SHUTDOWN_FAILED;
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conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */
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conn->ssl[sockindex].state = ssl_connection_none;
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conn->recv[sockindex] = Curl_recv_plain;
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conn->send[sockindex] = Curl_send_plain;
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return CURLE_OK;
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}
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/* Selects an SSL crypto engine
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*/
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CURLcode Curl_ssl_set_engine(struct SessionHandle *data, const char *engine)
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{
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return curlssl_set_engine(data, engine);
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}
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/* Selects the default SSL crypto engine
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*/
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CURLcode Curl_ssl_set_engine_default(struct SessionHandle *data)
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{
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return curlssl_set_engine_default(data);
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}
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/* Return list of OpenSSL crypto engine names. */
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struct curl_slist *Curl_ssl_engines_list(struct SessionHandle *data)
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{
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return curlssl_engines_list(data);
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}
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/*
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* This sets up a session ID cache to the specified size. Make sure this code
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* is agnostic to what underlying SSL technology we use.
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*/
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CURLcode Curl_ssl_initsessions(struct SessionHandle *data, long amount)
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{
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struct curl_ssl_session *session;
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if(data->state.session)
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/* this is just a precaution to prevent multiple inits */
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return CURLE_OK;
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session = calloc(amount, sizeof(struct curl_ssl_session));
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if(!session)
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return CURLE_OUT_OF_MEMORY;
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/* store the info in the SSL section */
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data->set.ssl.numsessions = amount;
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data->state.session = session;
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data->state.sessionage = 1; /* this is brand new */
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return CURLE_OK;
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}
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size_t Curl_ssl_version(char *buffer, size_t size)
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{
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return curlssl_version(buffer, size);
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}
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/*
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* This function tries to determine connection status.
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*
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* Return codes:
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* 1 means the connection is still in place
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* 0 means the connection has been closed
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* -1 means the connection status is unknown
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*/
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int Curl_ssl_check_cxn(struct connectdata *conn)
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{
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return curlssl_check_cxn(conn);
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}
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bool Curl_ssl_data_pending(const struct connectdata *conn,
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int connindex)
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{
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return curlssl_data_pending(conn, connindex);
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}
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void Curl_ssl_free_certinfo(struct SessionHandle *data)
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{
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int i;
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struct curl_certinfo *ci = &data->info.certs;
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if(ci->num_of_certs) {
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/* free all individual lists used */
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for(i=0; i<ci->num_of_certs; i++)
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curl_slist_free_all(ci->certinfo[i]);
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free(ci->certinfo); /* free the actual array too */
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ci->num_of_certs = 0;
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}
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}
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#endif /* USE_SSL */
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