int tls_construct_ctos_server_name(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { if (s->ext.hostname == NULL) return 1; /* Add TLS extension servername to the Client Hello message */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_server_name) /* Sub-packet for server_name extension */ || !WPACKET_start_sub_packet_u16(pkt) /* Sub-packet for servername list (always 1 hostname)*/ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u8(pkt, TLSEXT_NAMETYPE_host_name) || !WPACKET_sub_memcpy_u16(pkt, s->ext.hostname, strlen(s->ext.hostname)) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SERVER_NAME, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, int *al) { size_t salglen; const unsigned char *salg; if (!SSL_CLIENT_USE_SIGALGS(s)) return 1; salglen = tls12_get_psigalgs(s, &salg); if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms) /* Sub-packet for sig-algs extension */ || !WPACKET_start_sub_packet_u16(pkt) /* Sub-packet for the actual list */ || !WPACKET_start_sub_packet_u16(pkt) || !tls12_copy_sigalgs(s, pkt, salg, salglen) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SIG_ALGS, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_ctos_use_srtp(SSL *s, WPACKET *pkt, int *al) { STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = SSL_get_srtp_profiles(s); int i, end; if (clnt == NULL) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp) /* Sub-packet for SRTP extension */ || !WPACKET_start_sub_packet_u16(pkt) /* Sub-packet for the protection profile list */ || !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR); return 0; } end = sk_SRTP_PROTECTION_PROFILE_num(clnt); for (i = 0; i < end; i++) { const SRTP_PROTECTION_PROFILE *prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); if (prof == NULL || !WPACKET_put_bytes_u16(pkt, prof->id)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR); return 0; } } if (!WPACKET_close(pkt) /* Add an empty use_mki value */ || !WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_USE_SRTP, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
EXT_RETURN tls_construct_stoc_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { if (!s->hit) return EXT_RETURN_NOT_SENT; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u16(pkt, s->session->ext.tick_identity) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_PSK, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; }
int tls_construct_ctos_supported_versions(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { int currv, min_version, max_version, reason; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_versions) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u8(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, ERR_R_INTERNAL_ERROR); return 0; } reason = ssl_get_client_min_max_version(s, &min_version, &max_version); if (reason != 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, reason); return 0; } /* * TODO(TLS1.3): There is some discussion on the TLS list as to wheter * we should include versions <TLS1.2. For the moment we do. To be * reviewed later. */ for (currv = max_version; currv >= min_version; currv--) { /* TODO(TLS1.3): Remove this first if clause prior to release!! */ if (currv == TLS1_3_VERSION) { if (!WPACKET_put_bytes_u16(pkt, TLS1_3_VERSION_DRAFT)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, ERR_R_INTERNAL_ERROR); return 0; } } else if (!WPACKET_put_bytes_u16(pkt, currv)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, ERR_R_INTERNAL_ERROR); return 0; } } if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_VERSIONS, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_ctos_renegotiate(SSL *s, WPACKET *pkt, int *al) { /* Add RI if renegotiating */ if (!s->renegotiate) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_memcpy_u8(pkt, s->s3->previous_client_finished, s->s3->previous_client_finished_len) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_RENEGOTIATE, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, int *al) { if (s->srtp_profile == NULL) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u16(pkt, 2) || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id) || !WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_USE_SRTP, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
EXT_RETURN tls_construct_stoc_use_srtp(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { if (s->srtp_profile == NULL) return EXT_RETURN_NOT_SENT; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_use_srtp) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u16(pkt, 2) || !WPACKET_put_bytes_u16(pkt, s->srtp_profile->id) || !WPACKET_put_bytes_u8(pkt, 0) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_USE_SRTP, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; }
/* * Add the server's renegotiation binding */ int tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt, int *al) { if (!s->s3->send_connection_binding) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u8(pkt) || !WPACKET_memcpy(pkt, s->s3->previous_client_finished, s->s3->previous_client_finished_len) || !WPACKET_memcpy(pkt, s->s3->previous_server_finished, s->s3->previous_server_finished_len) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_RENEGOTIATE, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_ctos_alpn(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { s->s3->alpn_sent = 0; if (s->ext.alpn == NULL || !SSL_IS_FIRST_HANDSHAKE(s)) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_application_layer_protocol_negotiation) /* Sub-packet ALPN extension */ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_memcpy_u16(pkt, s->ext.alpn, s->ext.alpn_len) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_ALPN, ERR_R_INTERNAL_ERROR); return 0; } s->s3->alpn_sent = 1; return 1; }
int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, int *al) { const unsigned char *pformats; size_t num_formats; if (!use_ecc(s)) return 1; /* Add TLS extension ECPointFormats to the ClientHello message */ tls1_get_formatlist(s, &pformats, &num_formats); if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats) /* Sub-packet for formats extension */ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_memcpy_u8(pkt, pformats, num_formats) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
/* Add/include the server's max fragment len extension into ServerHello */ EXT_RETURN tls_construct_stoc_maxfragmentlen(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx) { if (!USE_MAX_FRAGMENT_LENGTH_EXT(s->session)) return EXT_RETURN_NOT_SENT; /*- * 4 bytes for this extension type and extension length * 1 byte for the Max Fragment Length code value. */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_max_fragment_length) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u8(pkt, s->session->ext.max_fragment_len_mode) || !WPACKET_close(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_MAXFRAGMENTLEN, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; }
int tls_construct_ctos_srp(SSL *s, WPACKET *pkt, int *al) { /* Add SRP username if there is one */ if (s->srp_ctx.login == NULL) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_srp) /* Sub-packet for SRP extension */ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u8(pkt) /* login must not be zero...internal error if so */ || !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH) || !WPACKET_memcpy(pkt, s->srp_ctx.login, strlen(s->srp_ctx.login)) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SRP, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
/* * Add the server's renegotiation binding */ EXT_RETURN tls_construct_stoc_renegotiate(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { if (!s->s3->send_connection_binding) return EXT_RETURN_NOT_SENT; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_renegotiate) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u8(pkt) || !WPACKET_memcpy(pkt, s->s3->previous_client_finished, s->s3->previous_client_finished_len) || !WPACKET_memcpy(pkt, s->s3->previous_server_finished, s->s3->previous_server_finished_len) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_RENEGOTIATE, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; }
int tls_construct_stoc_ec_pt_formats(SSL *s, WPACKET *pkt, int *al) { unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; int using_ecc = ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA)) && (s->session->tlsext_ecpointformatlist != NULL); const unsigned char *plist; size_t plistlen; if (!using_ecc) return 1; tls1_get_formatlist(s, &plist, &plistlen); if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_ec_point_formats) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_memcpy_u8(pkt, plist, plistlen) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_EC_PT_FORMATS, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
/* * Construct a psk_kex_modes extension. We only have two modes we know about * at this stage, so we send both. */ int tls_construct_ctos_psk_kex_modes(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { #ifndef OPENSSL_NO_TLS1_3 /* * TODO(TLS1.3): Do we want this list to be configurable? For now we always * just send both supported modes */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk_kex_modes) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u8(pkt) || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE_DHE) || !WPACKET_put_bytes_u8(pkt, TLSEXT_KEX_MODE_KE) || !WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK_KEX_MODES, ERR_R_INTERNAL_ERROR); return 0; } s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_KE | TLSEXT_KEX_MODE_FLAG_KE_DHE; #endif return 1; }
EXT_RETURN tls_construct_stoc_key_share(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { #ifndef OPENSSL_NO_TLS1_3 unsigned char *encodedPoint; size_t encoded_pt_len = 0; EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL; if (ckey == NULL) { /* No key_share received from client */ if (s->hello_retry_request) { if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u16(pkt, s->s3->group_id) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; } /* Must be resuming. */ if (!s->hit || !tls13_generate_handshake_secret(s, NULL, 0)) { *al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_NOT_SENT; } if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } skey = ssl_generate_pkey(ckey); if (skey == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_MALLOC_FAILURE); return EXT_RETURN_FAIL; } /* Generate encoding of server key */ encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint); if (encoded_pt_len == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_EC_LIB); EVP_PKEY_free(skey); return EXT_RETURN_FAIL; } if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR); EVP_PKEY_free(skey); OPENSSL_free(encodedPoint); return EXT_RETURN_FAIL; } OPENSSL_free(encodedPoint); /* This causes the crypto state to be updated based on the derived keys */ s->s3->tmp.pkey = skey; if (ssl_derive(s, skey, ckey, 1) == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } #endif return EXT_RETURN_SENT; }
EXT_RETURN tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx) { const uint16_t *groups; size_t numgroups, i, first = 1; /* s->s3->group_id is non zero if we accepted a key_share */ if (s->s3->group_id == 0) return EXT_RETURN_NOT_SENT; /* Get our list of supported groups */ tls1_get_supported_groups(s, &groups, &numgroups); if (numgroups == 0) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } /* Copy group ID if supported */ for (i = 0; i < numgroups; i++) { uint16_t group = groups[i]; if (tls_curve_allowed(s, group, SSL_SECOP_CURVE_SUPPORTED)) { if (first) { /* * Check if the client is already using our preferred group. If * so we don't need to add this extension */ if (s->s3->group_id == group) return EXT_RETURN_NOT_SENT; /* Add extension header */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_supported_groups) /* Sub-packet for supported_groups extension */ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u16(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } first = 0; } if (!WPACKET_put_bytes_u16(pkt, group)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } } } if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_STOC_SUPPORTED_GROUPS, ERR_R_INTERNAL_ERROR); return EXT_RETURN_FAIL; } return EXT_RETURN_SENT; }
/* * Construct the pre_shared_key extension */ int tls_construct_ctos_psk(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { #ifndef OPENSSL_NO_TLS1_3 uint32_t now, agesec, agems; size_t hashsize, binderoffset, msglen; unsigned char *binder = NULL, *msgstart = NULL; const EVP_MD *md; int ret = 0; s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY; /* * If this is an incompatible or new session then we have nothing to resume * so don't add this extension. */ if (s->session->ssl_version != TLS1_3_VERSION || s->session->ext.ticklen == 0) return 1; if (s->session->cipher == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR); goto err; } md = ssl_md(s->session->cipher->algorithm2); if (md == NULL) { /* Don't recognise this cipher so we can't use the session. Ignore it */ return 1; } /* * Technically the C standard just says time() returns a time_t and says * nothing about the encoding of that type. In practice most implementations * follow POSIX which holds it as an integral type in seconds since epoch. * We've already made the assumption that we can do this in multiple places * in the code, so portability shouldn't be an issue. */ now = (uint32_t)time(NULL); agesec = now - (uint32_t)s->session->time; if (s->session->ext.tick_lifetime_hint < agesec) { /* Ticket is too old. Ignore it. */ return 1; } /* * Calculate age in ms. We're just doing it to nearest second. Should be * good enough. */ agems = agesec * (uint32_t)1000; if (agesec != 0 && agems / (uint32_t)1000 != agesec) { /* * Overflow. Shouldn't happen unless this is a *really* old session. If * so we just ignore it. */ return 1; } /* * Obfuscate the age. Overflow here is fine, this addition is supposed to * be mod 2^32. */ agems += s->session->ext.tick_age_add; hashsize = EVP_MD_size(md); /* Create the extension, but skip over the binder for now */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_psk) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_memcpy_u16(pkt, s->session->ext.tick, s->session->ext.ticklen) || !WPACKET_put_bytes_u32(pkt, agems) || !WPACKET_close(pkt) || !WPACKET_get_total_written(pkt, &binderoffset) || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_sub_allocate_bytes_u8(pkt, hashsize, &binder) || !WPACKET_close(pkt) || !WPACKET_close(pkt) || !WPACKET_get_total_written(pkt, &msglen) /* * We need to fill in all the sub-packet lengths now so we can * calculate the HMAC of the message up to the binders */ || !WPACKET_fill_lengths(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR); goto err; } msgstart = WPACKET_get_curr(pkt) - msglen; if (tls_psk_do_binder(s, md, msgstart, binderoffset, NULL, binder, s->session, 1) != 1) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PSK, ERR_R_INTERNAL_ERROR); goto err; } s->session->ext.tick_identity = 0; ret = 1; err: return ret; #else return 1; #endif }
int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { #ifndef OPENSSL_NO_TLS1_3 size_t i, num_curves = 0; const unsigned char *pcurves = NULL; unsigned int curve_id = 0; /* key_share extension */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share) /* Extension data sub-packet */ || !WPACKET_start_sub_packet_u16(pkt) /* KeyShare list sub-packet */ || !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } pcurves = s->ext.supportedgroups; if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } if (s->s3->tmp.pkey != NULL) { /* Shouldn't happen! */ SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } /* * TODO(TLS1.3): Make the number of key_shares sent configurable. For * now, just send one */ if (s->s3->group_id != 0) { curve_id = s->s3->group_id; } else { for (i = 0; i < num_curves; i++, pcurves += 2) { if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) continue; curve_id = bytestogroup(pcurves); break; } } if (curve_id == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, SSL_R_NO_SUITABLE_KEY_SHARE); return 0; } if (!add_key_share(s, pkt, curve_id)) return 0; if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } #endif return 1; }
/* * Request custom extension data from the application and add to the return * buffer. */ int custom_ext_add(SSL *s, int context, WPACKET *pkt, X509 *x, size_t chainidx, int maxversion, int *al) { custom_ext_methods *exts = &s->cert->custext; custom_ext_method *meth; 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 (!should_add_extension(s, meth->context, context, maxversion)) continue; if ((context & (SSL_EXT_TLS1_2_SERVER_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST)) != 0) { /* Only send extensions present in ClientHello. */ if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED)) continue; } /* * We skip it if the callback is absent - except for a ClientHello where * we add an empty extension. */ if ((context & SSL_EXT_CLIENT_HELLO) == 0 && meth->add_cb == NULL) continue; if (meth->add_cb != NULL) { int cb_retval = meth->add_cb(s, meth->ext_type, context, &out, &outlen, x, chainidx, al, meth->add_arg); if (cb_retval < 0) return 0; /* error */ if (cb_retval == 0) continue; /* skip this extension */ } if (!WPACKET_put_bytes_u16(pkt, meth->ext_type) || !WPACKET_start_sub_packet_u16(pkt) || (outlen > 0 && !WPACKET_memcpy(pkt, out, outlen)) || !WPACKET_close(pkt)) { *al = SSL_AD_INTERNAL_ERROR; return 0; } if ((context & SSL_EXT_CLIENT_HELLO) != 0) { /* * We can't send duplicates: code logic should prevent this. */ if (!ossl_assert((meth->ext_flags & SSL_EXT_FLAG_SENT) == 0)) { *al = SSL_AD_INTERNAL_ERROR; return 0; } /* * 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 != NULL) meth->free_cb(s, meth->ext_type, context, out, meth->add_arg); } return 1; }
int tls_construct_ctos_key_share(SSL *s, WPACKET *pkt, int *al) { size_t i, sharessent = 0, num_curves = 0; const unsigned char *pcurves = NULL; /* key_share extension */ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share) /* Extension data sub-packet */ || !WPACKET_start_sub_packet_u16(pkt) /* KeyShare list sub-packet */ || !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } pcurves = s->tlsext_supportedgroupslist; if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } /* * TODO(TLS1.3): Make the number of key_shares sent configurable. For * now, just send one */ for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) { unsigned char *encodedPoint = NULL; unsigned int curve_id = 0; EVP_PKEY *key_share_key = NULL; size_t encodedlen; if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) continue; if (s->s3->tmp.pkey != NULL) { /* Shouldn't happen! */ SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } /* Generate a key for this key_share */ curve_id = (pcurves[0] << 8) | pcurves[1]; key_share_key = ssl_generate_pkey_curve(curve_id); if (key_share_key == NULL) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EVP_LIB); return 0; } /* Encode the public key. */ encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key, &encodedPoint); if (encodedlen == 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_EC_LIB); EVP_PKEY_free(key_share_key); return 0; } /* Create KeyShareEntry */ if (!WPACKET_put_bytes_u16(pkt, curve_id) || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); EVP_PKEY_free(key_share_key); OPENSSL_free(encodedPoint); return 0; } /* * TODO(TLS1.3): When changing to send more than one key_share we're * going to need to be able to save more than one EVP_PKEY. For now * we reuse the existing tmp.pkey */ s->s3->group_id = curve_id; s->s3->tmp.pkey = key_share_key; sharessent++; OPENSSL_free(encodedPoint); } if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int tls_construct_ctos_status_request(SSL *s, WPACKET *pkt, unsigned int context, X509 *x, size_t chainidx, int *al) { int i; /* This extension isn't defined for client Certificates */ if (x != NULL) return 1; if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp) return 1; if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_status_request) /* Sub-packet for status request extension */ || !WPACKET_start_sub_packet_u16(pkt) || !WPACKET_put_bytes_u8(pkt, TLSEXT_STATUSTYPE_ocsp) /* Sub-packet for the ids */ || !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } for (i = 0; i < sk_OCSP_RESPID_num(s->ext.ocsp.ids); i++) { unsigned char *idbytes; OCSP_RESPID *id = sk_OCSP_RESPID_value(s->ext.ocsp.ids, i); int idlen = i2d_OCSP_RESPID(id, NULL); if (idlen <= 0 /* Sub-packet for an individual id */ || !WPACKET_sub_allocate_bytes_u16(pkt, idlen, &idbytes) || i2d_OCSP_RESPID(id, &idbytes) != idlen) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } } if (!WPACKET_close(pkt) || !WPACKET_start_sub_packet_u16(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } if (s->ext.ocsp.exts) { unsigned char *extbytes; int extlen = i2d_X509_EXTENSIONS(s->ext.ocsp.exts, NULL); if (extlen < 0) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } if (!WPACKET_allocate_bytes(pkt, extlen, &extbytes) || i2d_X509_EXTENSIONS(s->ext.ocsp.exts, &extbytes) != extlen) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } } if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) { SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_STATUS_REQUEST, ERR_R_INTERNAL_ERROR); return 0; } return 1; }
int DTLSv1_listen(SSL *s, BIO_ADDR *client) { int next, n, ret = 0, clearpkt = 0; unsigned char cookie[DTLS1_COOKIE_LENGTH]; unsigned char seq[SEQ_NUM_SIZE]; const unsigned char *data; unsigned char *buf; size_t fragoff, fraglen, msglen; unsigned int rectype, versmajor, msgseq, msgtype, clientvers, cookielen; BIO *rbio, *wbio; BUF_MEM *bufm; BIO_ADDR *tmpclient = NULL; PACKET pkt, msgpkt, msgpayload, session, cookiepkt; /* Ensure there is no state left over from a previous invocation */ if (!SSL_clear(s)) return -1; ERR_clear_error(); rbio = SSL_get_rbio(s); wbio = SSL_get_wbio(s); if (!rbio || !wbio) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BIO_NOT_SET); return -1; } /* * We only peek at incoming ClientHello's until we're sure we are going to * to respond with a HelloVerifyRequest. If its a ClientHello with a valid * cookie then we leave it in the BIO for accept to handle. */ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 1, NULL); /* * Note: This check deliberately excludes DTLS1_BAD_VER because that version * requires the MAC to be calculated *including* the first ClientHello * (without the cookie). Since DTLSv1_listen is stateless that cannot be * supported. DTLS1_BAD_VER must use cookies in a stateful manner (e.g. via * SSL_accept) */ if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNSUPPORTED_SSL_VERSION); return -1; } if (s->init_buf == NULL) { if ((bufm = BUF_MEM_new()) == NULL) { SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE); return -1; } if (!BUF_MEM_grow(bufm, SSL3_RT_MAX_PLAIN_LENGTH)) { BUF_MEM_free(bufm); SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE); return -1; } s->init_buf = bufm; } buf = (unsigned char *)s->init_buf->data; do { /* Get a packet */ clear_sys_error(); /* * Technically a ClientHello could be SSL3_RT_MAX_PLAIN_LENGTH * + DTLS1_RT_HEADER_LENGTH bytes long. Normally init_buf does not store * the record header as well, but we do here. We've set up init_buf to * be the standard size for simplicity. In practice we shouldn't ever * receive a ClientHello as long as this. If we do it will get dropped * in the record length check below. */ n = BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH); if (n <= 0) { if (BIO_should_retry(rbio)) { /* Non-blocking IO */ goto end; } return -1; } /* If we hit any problems we need to clear this packet from the BIO */ clearpkt = 1; if (!PACKET_buf_init(&pkt, buf, n)) { SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR); return -1; } /* * Parse the received record. If there are any problems with it we just * dump it - with no alert. RFC6347 says this "Unlike TLS, DTLS is * resilient in the face of invalid records (e.g., invalid formatting, * length, MAC, etc.). In general, invalid records SHOULD be silently * discarded, thus preserving the association; however, an error MAY be * logged for diagnostic purposes." */ /* this packet contained a partial record, dump it */ if (n < DTLS1_RT_HEADER_LENGTH) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_RECORD_TOO_SMALL); goto end; } if (s->msg_callback) s->msg_callback(0, 0, SSL3_RT_HEADER, buf, DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); /* Get the record header */ if (!PACKET_get_1(&pkt, &rectype) || !PACKET_get_1(&pkt, &versmajor)) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH); goto end; } if (rectype != SSL3_RT_HANDSHAKE) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE); goto end; } /* * Check record version number. We only check that the major version is * the same. */ if (versmajor != DTLS1_VERSION_MAJOR) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); goto end; } if (!PACKET_forward(&pkt, 1) /* Save the sequence number: 64 bits, with top 2 bytes = epoch */ || !PACKET_copy_bytes(&pkt, seq, SEQ_NUM_SIZE) || !PACKET_get_length_prefixed_2(&pkt, &msgpkt)) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH); goto end; } /* * We allow data remaining at the end of the packet because there could * be a second record (but we ignore it) */ /* This is an initial ClientHello so the epoch has to be 0 */ if (seq[0] != 0 || seq[1] != 0) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE); goto end; } /* Get a pointer to the raw message for the later callback */ data = PACKET_data(&msgpkt); /* Finished processing the record header, now process the message */ if (!PACKET_get_1(&msgpkt, &msgtype) || !PACKET_get_net_3_len(&msgpkt, &msglen) || !PACKET_get_net_2(&msgpkt, &msgseq) || !PACKET_get_net_3_len(&msgpkt, &fragoff) || !PACKET_get_net_3_len(&msgpkt, &fraglen) || !PACKET_get_sub_packet(&msgpkt, &msgpayload, fraglen) || PACKET_remaining(&msgpkt) != 0) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH); goto end; } if (msgtype != SSL3_MT_CLIENT_HELLO) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_UNEXPECTED_MESSAGE); goto end; } /* Message sequence number can only be 0 or 1 */ if (msgseq > 2) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_INVALID_SEQUENCE_NUMBER); goto end; } /* * We don't support fragment reassembly for ClientHellos whilst * listening because that would require server side state (which is * against the whole point of the ClientHello/HelloVerifyRequest * mechanism). Instead we only look at the first ClientHello fragment * and require that the cookie must be contained within it. */ if (fragoff != 0 || fraglen > msglen) { /* Non initial ClientHello fragment (or bad fragment) */ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_FRAGMENTED_CLIENT_HELLO); goto end; } if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, data, fraglen + DTLS1_HM_HEADER_LENGTH, s, s->msg_callback_arg); if (!PACKET_get_net_2(&msgpayload, &clientvers)) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH); goto end; } /* * Verify client version is supported */ if (DTLS_VERSION_LT(clientvers, (unsigned int)s->method->version) && s->method->version != DTLS_ANY_VERSION) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_WRONG_VERSION_NUMBER); goto end; } if (!PACKET_forward(&msgpayload, SSL3_RANDOM_SIZE) || !PACKET_get_length_prefixed_1(&msgpayload, &session) || !PACKET_get_length_prefixed_1(&msgpayload, &cookiepkt)) { /* * Could be malformed or the cookie does not fit within the initial * ClientHello fragment. Either way we can't handle it. */ SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_LENGTH_MISMATCH); goto end; } /* * Check if we have a cookie or not. If not we need to send a * HelloVerifyRequest. */ if (PACKET_remaining(&cookiepkt) == 0) { next = LISTEN_SEND_VERIFY_REQUEST; } else { /* * We have a cookie, so lets check it. */ if (s->ctx->app_verify_cookie_cb == NULL) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_NO_VERIFY_COOKIE_CALLBACK); /* This is fatal */ return -1; } if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookiepkt), (unsigned int)PACKET_remaining(&cookiepkt)) == 0) { /* * We treat invalid cookies in the same was as no cookie as * per RFC6347 */ next = LISTEN_SEND_VERIFY_REQUEST; } else { /* Cookie verification succeeded */ next = LISTEN_SUCCESS; } } if (next == LISTEN_SEND_VERIFY_REQUEST) { WPACKET wpkt; unsigned int version; size_t wreclen; /* * There was no cookie in the ClientHello so we need to send a * HelloVerifyRequest. If this fails we do not worry about trying * to resend, we just drop it. */ /* * Dump the read packet, we don't need it any more. Ignore return * value */ BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 0, NULL); BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH); BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 1, NULL); /* Generate the cookie */ if (s->ctx->app_gen_cookie_cb == NULL || s->ctx->app_gen_cookie_cb(s, cookie, &cookielen) == 0 || cookielen > 255) { SSLerr(SSL_F_DTLSV1_LISTEN, SSL_R_COOKIE_GEN_CALLBACK_FAILURE); /* This is fatal */ return -1; } /* * Special case: for hello verify request, client version 1.0 and we * haven't decided which version to use yet send back using version * 1.0 header: otherwise some clients will ignore it. */ version = (s->method->version == DTLS_ANY_VERSION) ? DTLS1_VERSION : s->version; /* Construct the record and message headers */ if (!WPACKET_init(&wpkt, s->init_buf) || !WPACKET_put_bytes_u8(&wpkt, SSL3_RT_HANDSHAKE) || !WPACKET_put_bytes_u16(&wpkt, version) /* * Record sequence number is always the same as in the * received ClientHello */ || !WPACKET_memcpy(&wpkt, seq, SEQ_NUM_SIZE) /* End of record, start sub packet for message */ || !WPACKET_start_sub_packet_u16(&wpkt) /* Message type */ || !WPACKET_put_bytes_u8(&wpkt, DTLS1_MT_HELLO_VERIFY_REQUEST) /* * Message length - doesn't follow normal TLS convention: * the length isn't the last thing in the message header. * We'll need to fill this in later when we know the * length. Set it to zero for now */ || !WPACKET_put_bytes_u24(&wpkt, 0) /* * Message sequence number is always 0 for a * HelloVerifyRequest */ || !WPACKET_put_bytes_u16(&wpkt, 0) /* * We never fragment a HelloVerifyRequest, so fragment * offset is 0 */ || !WPACKET_put_bytes_u24(&wpkt, 0) /* * Fragment length is the same as message length, but * this *is* the last thing in the message header so we * can just start a sub-packet. No need to come back * later for this one. */ || !WPACKET_start_sub_packet_u24(&wpkt) /* Create the actual HelloVerifyRequest body */ || !dtls_raw_hello_verify_request(&wpkt, cookie, cookielen) /* Close message body */ || !WPACKET_close(&wpkt) /* Close record body */ || !WPACKET_close(&wpkt) || !WPACKET_get_total_written(&wpkt, &wreclen) || !WPACKET_finish(&wpkt)) { SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_INTERNAL_ERROR); WPACKET_cleanup(&wpkt); /* This is fatal */ return -1; } /* * Fix up the message len in the message header. Its the same as the * fragment len which has been filled in by WPACKET, so just copy * that. Destination for the message len is after the record header * plus one byte for the message content type. The source is the * last 3 bytes of the message header */ memcpy(&buf[DTLS1_RT_HEADER_LENGTH + 1], &buf[DTLS1_RT_HEADER_LENGTH + DTLS1_HM_HEADER_LENGTH - 3], 3); if (s->msg_callback) s->msg_callback(1, 0, SSL3_RT_HEADER, buf, DTLS1_RT_HEADER_LENGTH, s, s->msg_callback_arg); if ((tmpclient = BIO_ADDR_new()) == NULL) { SSLerr(SSL_F_DTLSV1_LISTEN, ERR_R_MALLOC_FAILURE); goto end; } /* * This is unnecessary if rbio and wbio are one and the same - but * maybe they're not. We ignore errors here - some BIOs do not * support this. */ if (BIO_dgram_get_peer(rbio, tmpclient) > 0) { (void)BIO_dgram_set_peer(wbio, tmpclient); } BIO_ADDR_free(tmpclient); tmpclient = NULL; /* TODO(size_t): convert this call */ if (BIO_write(wbio, buf, wreclen) < (int)wreclen) { if (BIO_should_retry(wbio)) { /* * Non-blocking IO...but we're stateless, so we're just * going to drop this packet. */ goto end; } return -1; } if (BIO_flush(wbio) <= 0) { if (BIO_should_retry(wbio)) { /* * Non-blocking IO...but we're stateless, so we're just * going to drop this packet. */ goto end; } return -1; } } } while (next != LISTEN_SUCCESS); /* * Set expected sequence numbers to continue the handshake. */ s->d1->handshake_read_seq = 1; s->d1->handshake_write_seq = 1; s->d1->next_handshake_write_seq = 1; DTLS_RECORD_LAYER_set_write_sequence(&s->rlayer, seq); /* * We are doing cookie exchange, so make sure we set that option in the * SSL object */ SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE); /* * Tell the state machine that we've done the initial hello verify * exchange */ ossl_statem_set_hello_verify_done(s); /* * Some BIOs may not support this. If we fail we clear the client address */ if (BIO_dgram_get_peer(rbio, client) <= 0) BIO_ADDR_clear(client); ret = 1; clearpkt = 0; end: BIO_ADDR_free(tmpclient); BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_PEEK_MODE, 0, NULL); if (clearpkt) { /* Dump this packet. Ignore return value */ BIO_read(rbio, buf, SSL3_RT_MAX_PLAIN_LENGTH); } return ret; }