mirror of
https://github.com/moparisthebest/curl
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31c521b047
Sessionid cache management is inseparable from managing individual session lifetimes. E.g. for reference-counted sessions (like those in SChannel and OpenSSL engines) every session addition and removal should be accompanied with refcount increment and decrement respectively. Failing to do so synchronously leads to a race condition that causes symptoms like use-after-free and memory corruption. This commit: - makes existing session cache locking explicit, thus allowing individual engines to manage lock's scope. - fixes OpenSSL and SChannel engines by putting refcount management inside this lock's scope in relevant places. - adds these explicit locking calls to other engines that use sessionid cache to accommodate for this change. Note, however, that it is unknown whether any of these engines could also have this race. Bug: https://github.com/curl/curl/issues/815 Fixes #815 Closes #847
191 lines
7.9 KiB
C
191 lines
7.9 KiB
C
#ifndef HEADER_CURL_VTLS_H
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#define HEADER_CURL_VTLS_H
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/***************************************************************************
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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 - 2016, 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 https://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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#include "curl_setup.h"
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#include "openssl.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 "gskit.h" /* Global Secure ToolKit 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 "schannel.h" /* Schannel SSPI version */
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#include "darwinssl.h" /* SecureTransport (Darwin) version */
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#include "mbedtls.h" /* mbedTLS versions */
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#ifndef MAX_PINNED_PUBKEY_SIZE
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#define MAX_PINNED_PUBKEY_SIZE 1048576 /* 1MB */
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#endif
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#ifndef MD5_DIGEST_LENGTH
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#define MD5_DIGEST_LENGTH 16 /* fixed size */
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#endif
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#ifndef SHA256_DIGEST_LENGTH
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#define SHA256_DIGEST_LENGTH 32 /* fixed size */
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#endif
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/* see https://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-04 */
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#define ALPN_HTTP_1_1_LENGTH 8
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#define ALPN_HTTP_1_1 "http/1.1"
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bool Curl_ssl_config_matches(struct ssl_config_data* data,
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struct ssl_config_data* needle);
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bool Curl_clone_ssl_config(struct ssl_config_data* source,
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struct ssl_config_data* dest);
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void Curl_free_ssl_config(struct ssl_config_data* sslc);
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unsigned int Curl_rand(struct SessionHandle *);
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int Curl_ssl_backend(void);
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#ifdef USE_SSL
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int Curl_ssl_init(void);
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void Curl_ssl_cleanup(void);
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CURLcode Curl_ssl_connect(struct connectdata *conn, int sockindex);
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CURLcode Curl_ssl_connect_nonblocking(struct connectdata *conn,
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int sockindex,
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bool *done);
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/* tell the SSL stuff to close down all open information regarding
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connections (and thus session ID caching etc) */
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void Curl_ssl_close_all(struct SessionHandle *data);
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void Curl_ssl_close(struct connectdata *conn, int sockindex);
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CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex);
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CURLcode Curl_ssl_set_engine(struct SessionHandle *data, const char *engine);
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/* Sets engine as default for all SSL operations */
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CURLcode Curl_ssl_set_engine_default(struct SessionHandle *data);
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struct curl_slist *Curl_ssl_engines_list(struct SessionHandle *data);
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/* init the SSL session ID cache */
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CURLcode Curl_ssl_initsessions(struct SessionHandle *, size_t);
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size_t Curl_ssl_version(char *buffer, size_t size);
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bool Curl_ssl_data_pending(const struct connectdata *conn,
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int connindex);
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int Curl_ssl_check_cxn(struct connectdata *conn);
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/* Certificate information list handling. */
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void Curl_ssl_free_certinfo(struct SessionHandle *data);
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CURLcode Curl_ssl_init_certinfo(struct SessionHandle * data, int num);
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CURLcode Curl_ssl_push_certinfo_len(struct SessionHandle * data, int certnum,
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const char * label, const char * value,
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size_t valuelen);
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CURLcode Curl_ssl_push_certinfo(struct SessionHandle * data, int certnum,
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const char * label, const char * value);
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/* Functions to be used by SSL library adaptation functions */
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/* Lock session cache mutex.
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* Call this before calling other Curl_ssl_*session* functions
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* Caller should unlock this mutex as soon as possible, as it may block
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* other SSL connection from making progress.
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* The purpose of explicitly locking SSL session cache data is to allow
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* individual SSL engines to manage session lifetime in their specific way.
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*/
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void Curl_ssl_sessionid_lock(struct connectdata *conn);
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/* Unlock session cache mutex */
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void Curl_ssl_sessionid_unlock(struct connectdata *conn);
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/* extract a session ID
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* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
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* Caller must make sure that the ownership of returned sessionid object
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* is properly taken (e.g. its refcount is incremented
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* under sessionid mutex).
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*/
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bool 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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/* add a new session ID
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* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
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* Caller must ensure that it has properly shared ownership of this sessionid
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* object with cache (e.g. incrementing refcount on success)
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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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/* Kill a single session ID entry in the cache
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* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
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* This will call engine-specific curlssl_session_free function, which must
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* take sessionid object ownership from sessionid cache
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* (e.g. decrement refcount).
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*/
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void Curl_ssl_kill_session(struct curl_ssl_session *session);
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/* delete a session from the cache
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* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
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* This will call engine-specific curlssl_session_free function, which must
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* take sessionid object ownership from sessionid cache
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* (e.g. decrement refcount).
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*/
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void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid);
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/* get N random bytes into the buffer, return 0 if a find random is filled
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in */
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int Curl_ssl_random(struct SessionHandle *data, unsigned char *buffer,
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size_t length);
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CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */
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size_t tmplen,
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unsigned char *md5sum, /* output */
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size_t md5len);
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/* Check pinned public key. */
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CURLcode Curl_pin_peer_pubkey(struct SessionHandle *data,
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const char *pinnedpubkey,
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const unsigned char *pubkey, size_t pubkeylen);
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bool Curl_ssl_cert_status_request(void);
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bool Curl_ssl_false_start(void);
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#define SSL_SHUTDOWN_TIMEOUT 10000 /* ms */
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#else
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/* Set the API backend definition to none */
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#define CURL_SSL_BACKEND CURLSSLBACKEND_NONE
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/* When SSL support is not present, just define away these function calls */
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#define Curl_ssl_init() 1
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#define Curl_ssl_cleanup() Curl_nop_stmt
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#define Curl_ssl_connect(x,y) CURLE_NOT_BUILT_IN
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#define Curl_ssl_close_all(x) Curl_nop_stmt
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#define Curl_ssl_close(x,y) Curl_nop_stmt
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#define Curl_ssl_shutdown(x,y) CURLE_NOT_BUILT_IN
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#define Curl_ssl_set_engine(x,y) CURLE_NOT_BUILT_IN
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#define Curl_ssl_set_engine_default(x) CURLE_NOT_BUILT_IN
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#define Curl_ssl_engines_list(x) NULL
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#define Curl_ssl_send(a,b,c,d,e) -1
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#define Curl_ssl_recv(a,b,c,d,e) -1
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#define Curl_ssl_initsessions(x,y) CURLE_OK
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#define Curl_ssl_version(x,y) 0
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#define Curl_ssl_data_pending(x,y) 0
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#define Curl_ssl_check_cxn(x) 0
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#define Curl_ssl_free_certinfo(x) Curl_nop_stmt
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#define Curl_ssl_connect_nonblocking(x,y,z) CURLE_NOT_BUILT_IN
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#define Curl_ssl_kill_session(x) Curl_nop_stmt
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#define Curl_ssl_random(x,y,z) ((void)x, CURLE_NOT_BUILT_IN)
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#define Curl_ssl_cert_status_request() FALSE
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#define Curl_ssl_false_start() FALSE
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#endif
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#endif /* HEADER_CURL_VTLS_H */
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