diff options
Diffstat (limited to 'openssl-1.1.0h/ssl/t1_ext.c')
| -rw-r--r-- | openssl-1.1.0h/ssl/t1_ext.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/openssl-1.1.0h/ssl/t1_ext.c b/openssl-1.1.0h/ssl/t1_ext.c new file mode 100644 index 0000000..a996a20 --- /dev/null +++ b/openssl-1.1.0h/ssl/t1_ext.c @@ -0,0 +1,283 @@ +/* + * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* Custom extension utility functions */ + +#include <openssl/ct.h> +#include "ssl_locl.h" + +/* Find a custom extension from the list. */ +static custom_ext_method *custom_ext_find(const custom_ext_methods *exts, + unsigned int ext_type) +{ + size_t i; + custom_ext_method *meth = exts->meths; + for (i = 0; i < exts->meths_count; i++, meth++) { + if (ext_type == meth->ext_type) + return meth; + } + return NULL; +} + +/* + * Initialise custom extensions flags to indicate neither sent nor received. + */ +void custom_ext_init(custom_ext_methods *exts) +{ + size_t i; + custom_ext_method *meth = exts->meths; + for (i = 0; i < exts->meths_count; i++, meth++) + meth->ext_flags = 0; +} + +/* Pass received custom extension data to the application for parsing. */ +int custom_ext_parse(SSL *s, int server, + unsigned int ext_type, + const unsigned char *ext_data, size_t ext_size, int *al) +{ + custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext; + custom_ext_method *meth; + meth = custom_ext_find(exts, ext_type); + /* If not found return success */ + if (!meth) + return 1; + if (!server) { + /* + * If it's ServerHello we can't have any extensions not sent in + * ClientHello. + */ + if (!(meth->ext_flags & SSL_EXT_FLAG_SENT)) { + *al = TLS1_AD_UNSUPPORTED_EXTENSION; + return 0; + } + } + /* If already present it's a duplicate */ + if (meth->ext_flags & SSL_EXT_FLAG_RECEIVED) { + *al = TLS1_AD_DECODE_ERROR; + return 0; + } + meth->ext_flags |= SSL_EXT_FLAG_RECEIVED; + /* If no parse function set return success */ + if (!meth->parse_cb) + return 1; + + return meth->parse_cb(s, ext_type, ext_data, ext_size, al, meth->parse_arg); +} + +/* + * Request custom extension data from the application and add to the return + * buffer. + */ +int custom_ext_add(SSL *s, int server, + unsigned char **pret, unsigned char *limit, int *al) +{ + custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext; + custom_ext_method *meth; + unsigned char *ret = *pret; + size_t i; + + for (i = 0; i < exts->meths_count; i++) { + const unsigned char *out = NULL; + size_t outlen = 0; + meth = exts->meths + i; + + if (server) { + /* + * For ServerHello only send extensions present in ClientHello. + */ + if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED)) + continue; + /* If callback absent for server skip it */ + if (!meth->add_cb) + continue; + } + if (meth->add_cb) { + int cb_retval = 0; + cb_retval = meth->add_cb(s, meth->ext_type, + &out, &outlen, al, meth->add_arg); + if (cb_retval < 0) + return 0; /* error */ + if (cb_retval == 0) + continue; /* skip this extension */ + } + if (4 > limit - ret || outlen > (size_t)(limit - ret - 4)) + return 0; + s2n(meth->ext_type, ret); + s2n(outlen, ret); + if (outlen) { + memcpy(ret, out, outlen); + ret += outlen; + } + /* + * We can't send duplicates: code logic should prevent this. + */ + OPENSSL_assert(!(meth->ext_flags & SSL_EXT_FLAG_SENT)); + /* + * Indicate extension has been sent: this is both a sanity check to + * ensure we don't send duplicate extensions and indicates that it is + * not an error if the extension is present in ServerHello. + */ + meth->ext_flags |= SSL_EXT_FLAG_SENT; + if (meth->free_cb) + meth->free_cb(s, meth->ext_type, out, meth->add_arg); + } + *pret = ret; + return 1; +} + +/* Copy the flags from src to dst for any extensions that exist in both */ +int custom_exts_copy_flags(custom_ext_methods *dst, + const custom_ext_methods *src) +{ + size_t i; + custom_ext_method *methsrc = src->meths; + + for (i = 0; i < src->meths_count; i++, methsrc++) { + custom_ext_method *methdst = custom_ext_find(dst, methsrc->ext_type); + + if (methdst == NULL) + continue; + + methdst->ext_flags = methsrc->ext_flags; + } + + return 1; +} + +/* Copy table of custom extensions */ +int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src) +{ + if (src->meths_count) { + dst->meths = + OPENSSL_memdup(src->meths, + sizeof(custom_ext_method) * src->meths_count); + if (dst->meths == NULL) + return 0; + dst->meths_count = src->meths_count; + } + return 1; +} + +void custom_exts_free(custom_ext_methods *exts) +{ + OPENSSL_free(exts->meths); +} + +/* Set callbacks for a custom extension. */ +static int custom_ext_meth_add(custom_ext_methods *exts, + unsigned int ext_type, + custom_ext_add_cb add_cb, + custom_ext_free_cb free_cb, + void *add_arg, + custom_ext_parse_cb parse_cb, void *parse_arg) +{ + custom_ext_method *meth, *tmp; + /* + * Check application error: if add_cb is not set free_cb will never be + * called. + */ + if (!add_cb && free_cb) + return 0; + /* + * Don't add if extension supported internally, but make exception + * for extension types that previously were not supported, but now are. + */ + if (SSL_extension_supported(ext_type) && + ext_type != TLSEXT_TYPE_signed_certificate_timestamp) + return 0; + /* Extension type must fit in 16 bits */ + if (ext_type > 0xffff) + return 0; + /* Search for duplicate */ + if (custom_ext_find(exts, ext_type)) + return 0; + tmp = OPENSSL_realloc(exts->meths, + (exts->meths_count + 1) * sizeof(custom_ext_method)); + + if (tmp == NULL) + return 0; + + exts->meths = tmp; + meth = exts->meths + exts->meths_count; + memset(meth, 0, sizeof(*meth)); + meth->parse_cb = parse_cb; + meth->add_cb = add_cb; + meth->free_cb = free_cb; + meth->ext_type = ext_type; + meth->add_arg = add_arg; + meth->parse_arg = parse_arg; + exts->meths_count++; + return 1; +} + +/* Return true if a client custom extension exists, false otherwise */ +int SSL_CTX_has_client_custom_ext(const SSL_CTX *ctx, unsigned int ext_type) +{ + return custom_ext_find(&ctx->cert->cli_ext, ext_type) != NULL; +} + +/* Application level functions to add custom extension callbacks */ +int SSL_CTX_add_client_custom_ext(SSL_CTX *ctx, unsigned int ext_type, + custom_ext_add_cb add_cb, + custom_ext_free_cb free_cb, + void *add_arg, + custom_ext_parse_cb parse_cb, void *parse_arg) +{ +#ifndef OPENSSL_NO_CT + /* + * We don't want applications registering callbacks for SCT extensions + * whilst simultaneously using the built-in SCT validation features, as + * these two things may not play well together. + */ + if (ext_type == TLSEXT_TYPE_signed_certificate_timestamp && + SSL_CTX_ct_is_enabled(ctx)) + return 0; +#endif + return custom_ext_meth_add(&ctx->cert->cli_ext, ext_type, add_cb, + free_cb, add_arg, parse_cb, parse_arg); +} + +int SSL_CTX_add_server_custom_ext(SSL_CTX *ctx, unsigned int ext_type, + custom_ext_add_cb add_cb, + custom_ext_free_cb free_cb, + void *add_arg, + custom_ext_parse_cb parse_cb, void *parse_arg) +{ + return custom_ext_meth_add(&ctx->cert->srv_ext, ext_type, + add_cb, free_cb, add_arg, parse_cb, parse_arg); +} + +int SSL_extension_supported(unsigned int ext_type) +{ + switch (ext_type) { + /* Internally supported extensions. */ + case TLSEXT_TYPE_application_layer_protocol_negotiation: + case TLSEXT_TYPE_ec_point_formats: + case TLSEXT_TYPE_elliptic_curves: + case TLSEXT_TYPE_heartbeat: +#ifndef OPENSSL_NO_NEXTPROTONEG + case TLSEXT_TYPE_next_proto_neg: +#endif + case TLSEXT_TYPE_padding: + case TLSEXT_TYPE_renegotiate: + case TLSEXT_TYPE_server_name: + case TLSEXT_TYPE_session_ticket: + case TLSEXT_TYPE_signature_algorithms: + case TLSEXT_TYPE_srp: + case TLSEXT_TYPE_status_request: + case TLSEXT_TYPE_signed_certificate_timestamp: + case TLSEXT_TYPE_use_srtp: +#ifdef TLSEXT_TYPE_encrypt_then_mac + case TLSEXT_TYPE_encrypt_then_mac: +#endif + return 1; + default: + return 0; + } +} |