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#ifndef HEADER_CURL_VTLS_INT_H
#define HEADER_CURL_VTLS_INT_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "../curl_setup.h"
#include "../cfilters.h"
#include "../urldata.h"
#include "vtls.h"
#ifdef USE_SSL
struct Curl_ssl;
struct ssl_connect_data;
/* see https://www.iana.org/assignments/tls-extensiontype-values/ */
#define ALPN_HTTP_1_1_LENGTH 8
#define ALPN_HTTP_1_1 "http/1.1"
#define ALPN_H2_LENGTH 2
#define ALPN_H2 "h2"
#define ALPN_H3_LENGTH 2
#define ALPN_H3 "h3"
/* conservative sizes on the ALPN entries and count we are handling,
* we can increase these if we ever feel the need or have to accommodate
* ALPN strings from the "outside". */
#define ALPN_NAME_MAX 10
#define ALPN_ENTRIES_MAX 3
#define ALPN_PROTO_BUF_MAX (ALPN_ENTRIES_MAX * (ALPN_NAME_MAX + 1))
struct alpn_spec {
char entries[ALPN_ENTRIES_MAX][ALPN_NAME_MAX];
size_t count; /* number of entries */
};
struct alpn_proto_buf {
unsigned char data[ALPN_PROTO_BUF_MAX];
int len;
};
CURLcode Curl_alpn_to_proto_buf(struct alpn_proto_buf *buf,
const struct alpn_spec *spec);
CURLcode Curl_alpn_to_proto_str(struct alpn_proto_buf *buf,
const struct alpn_spec *spec);
void Curl_alpn_restrict_to(struct alpn_spec *spec, const char *proto);
void Curl_alpn_copy(struct alpn_spec *dest, const struct alpn_spec *src);
CURLcode Curl_alpn_set_negotiated(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct ssl_connect_data *connssl,
const unsigned char *proto,
size_t proto_len);
bool Curl_alpn_contains_proto(const struct alpn_spec *spec,
const char *proto);
/* enum for the nonblocking SSL connection state machine */
typedef enum {
ssl_connect_1,
ssl_connect_2,
ssl_connect_3,
ssl_connect_done
} ssl_connect_state;
typedef enum {
ssl_connection_none,
ssl_connection_deferred,
ssl_connection_negotiating,
ssl_connection_complete
} ssl_connection_state;
typedef enum {
ssl_earlydata_none,
ssl_earlydata_await,
ssl_earlydata_sending,
ssl_earlydata_sent,
ssl_earlydata_accepted,
ssl_earlydata_rejected
} ssl_earlydata_state;
#define CURL_SSL_IO_NEED_NONE (0)
#define CURL_SSL_IO_NEED_RECV (1<<0)
#define CURL_SSL_IO_NEED_SEND (1<<1)
/* Max earlydata payload we want to send */
#define CURL_SSL_EARLY_MAX (64*1024)
/* Information in each SSL cfilter context: cf->ctx */
struct ssl_connect_data {
const struct Curl_ssl *ssl_impl; /* TLS backend for this filter */
struct ssl_peer peer; /* peer the filter talks to */
const struct alpn_spec *alpn; /* ALPN to use or NULL for none */
void *backend; /* vtls backend specific props */
struct cf_call_data call_data; /* data handle used in current call */
struct curltime handshake_done; /* time when handshake finished */
struct {
char *alpn; /* ALPN value or NULL */
} negotiated;
struct bufq earlydata; /* earlydata to be send to peer */
size_t earlydata_max; /* max earlydata allowed by peer */
size_t earlydata_skip; /* sending bytes to skip when earlydata
* is accepted by peer */
ssl_connection_state state;
ssl_connect_state connecting_state;
ssl_earlydata_state earlydata_state;
int io_need; /* TLS signals special SEND/RECV needs */
BIT(use_alpn); /* if ALPN shall be used in handshake */
BIT(peer_closed); /* peer has closed connection */
BIT(prefs_checked); /* SSL preferences have been checked */
BIT(input_pending); /* data for SSL_read() may be available */
};
#undef CF_CTX_CALL_DATA
#define CF_CTX_CALL_DATA(cf) \
((struct ssl_connect_data *)(cf)->ctx)->call_data
/* Definitions for SSL Implementations */
struct Curl_ssl {
/*
* This *must* be the first entry to allow returning the list of available
* backends in curl_global_sslset().
*/
curl_ssl_backend info;
unsigned int supports; /* bitfield, see above */
size_t sizeof_ssl_backend_data;
int (*init)(void);
void (*cleanup)(void);
size_t (*version)(char *buffer, size_t size);
CURLcode (*shut_down)(struct Curl_cfilter *cf, struct Curl_easy *data,
bool send_shutdown, bool *done);
bool (*data_pending)(struct Curl_cfilter *cf,
const struct Curl_easy *data);
/* return 0 if a find random is filled in */
CURLcode (*random)(struct Curl_easy *data, unsigned char *entropy,
size_t length);
bool (*cert_status_request)(void);
CURLcode (*do_connect)(struct Curl_cfilter *cf, struct Curl_easy *data,
bool *done);
/* During handshake/shutdown, adjust the pollset to include the socket
* for POLLOUT or POLLIN as needed. Mandatory. */
CURLcode (*adjust_pollset)(struct Curl_cfilter *cf, struct Curl_easy *data,
struct easy_pollset *ps);
void *(*get_internals)(struct ssl_connect_data *connssl, CURLINFO info);
void (*close)(struct Curl_cfilter *cf, struct Curl_easy *data);
void (*close_all)(struct Curl_easy *data);
CURLcode (*set_engine)(struct Curl_easy *data, const char *engine);
CURLcode (*set_engine_default)(struct Curl_easy *data);
struct curl_slist *(*engines_list)(struct Curl_easy *data);
CURLcode (*sha256sum)(const unsigned char *input, size_t inputlen,
unsigned char *sha256sum, size_t sha256sumlen);
CURLcode (*recv_plain)(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t len, size_t *pnread);
CURLcode (*send_plain)(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *mem, size_t len, size_t *pnwritten);
CURLcode (*get_channel_binding)(struct Curl_easy *data, int sockindex,
struct dynbuf *binding);
};
extern const struct Curl_ssl *Curl_ssl;
CURLcode Curl_ssl_adjust_pollset(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct easy_pollset *ps);
/**
* Get the SSL filter below the given one or NULL if there is none.
*/
bool Curl_ssl_cf_is_proxy(struct Curl_cfilter *cf);
#endif /* USE_SSL */
#endif /* HEADER_CURL_VTLS_INT_H */
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