1 /* 2 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include "ssl_local.h" 11 #include "internal/ssl_unwrap.h" 12 13 int ssl3_do_change_cipher_spec(SSL_CONNECTION *s) 14 { 15 int i; 16 SSL *ssl = SSL_CONNECTION_GET_SSL(s); 17 18 if (s->server) 19 i = SSL3_CHANGE_CIPHER_SERVER_READ; 20 else 21 i = SSL3_CHANGE_CIPHER_CLIENT_READ; 22 23 if (s->s3.tmp.key_block == NULL) { 24 if (s->session == NULL || s->session->master_key_length == 0) { 25 /* might happen if dtls1_read_bytes() calls this */ 26 ERR_raise(ERR_LIB_SSL, SSL_R_CCS_RECEIVED_EARLY); 27 return 0; 28 } 29 30 s->session->cipher = s->s3.tmp.new_cipher; 31 if (!ssl->method->ssl3_enc->setup_key_block(s)) { 32 /* SSLfatal() already called */ 33 return 0; 34 } 35 } 36 37 if (!ssl->method->ssl3_enc->change_cipher_state(s, i)) { 38 /* SSLfatal() already called */ 39 return 0; 40 } 41 42 return 1; 43 } 44 45 int ssl3_send_alert(SSL_CONNECTION *s, int level, int desc) 46 { 47 SSL *ssl = SSL_CONNECTION_GET_SSL(s); 48 49 /* Map tls/ssl alert value to correct one */ 50 if (SSL_CONNECTION_TREAT_AS_TLS13(s)) 51 desc = tls13_alert_code(desc); 52 else 53 desc = ssl->method->ssl3_enc->alert_value(desc); 54 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) 55 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have 56 * protocol_version alerts */ 57 if (desc < 0) 58 return -1; 59 if (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY) 60 return -1; 61 /* If a fatal one, remove from cache */ 62 if ((level == SSL3_AL_FATAL) && (s->session != NULL)) 63 SSL_CTX_remove_session(s->session_ctx, s->session); 64 65 s->s3.alert_dispatch = SSL_ALERT_DISPATCH_PENDING; 66 s->s3.send_alert[0] = level; 67 s->s3.send_alert[1] = desc; 68 if (!RECORD_LAYER_write_pending(&s->rlayer)) { 69 /* data still being written out? */ 70 return ssl->method->ssl_dispatch_alert(ssl); 71 } 72 /* 73 * else data is still being written out, we will get written some time in 74 * the future 75 */ 76 return -1; 77 } 78 79 int ssl3_dispatch_alert(SSL *s) 80 { 81 int i, j; 82 void (*cb) (const SSL *ssl, int type, int val) = NULL; 83 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s); 84 OSSL_RECORD_TEMPLATE templ; 85 86 if (sc == NULL) 87 return -1; 88 89 if (sc->rlayer.wrlmethod == NULL) { 90 /* No write record layer so we can't sent and alert. We just ignore it */ 91 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE; 92 return 1; 93 } 94 95 templ.type = SSL3_RT_ALERT; 96 templ.version = (sc->version == TLS1_3_VERSION) ? TLS1_2_VERSION 97 : sc->version; 98 if (SSL_get_state(s) == TLS_ST_CW_CLNT_HELLO 99 && !sc->renegotiate 100 && TLS1_get_version(s) > TLS1_VERSION 101 && sc->hello_retry_request == SSL_HRR_NONE) { 102 templ.version = TLS1_VERSION; 103 } 104 templ.buf = &sc->s3.send_alert[0]; 105 templ.buflen = 2; 106 107 if (RECORD_LAYER_write_pending(&sc->rlayer)) { 108 if (sc->s3.alert_dispatch != SSL_ALERT_DISPATCH_RETRY) { 109 /* 110 * We have a write pending but it wasn't from a previous call to 111 * this function! Can we ever get here? Maybe via API misuse?? 112 * Give up. 113 */ 114 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE; 115 return -1; 116 } 117 /* Retry what we've already got pending */ 118 i = HANDLE_RLAYER_WRITE_RETURN(sc, 119 sc->rlayer.wrlmethod->retry_write_records(sc->rlayer.wrl)); 120 if (i <= 0) { 121 /* Could be NBIO. Keep alert_dispatch as SSL_ALERT_DISPATCH_RETRY */ 122 return -1; 123 } 124 sc->rlayer.wpend_tot = 0; 125 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE; 126 return 1; 127 } 128 129 i = HANDLE_RLAYER_WRITE_RETURN(sc, 130 sc->rlayer.wrlmethod->write_records(sc->rlayer.wrl, &templ, 1)); 131 132 if (i <= 0) { 133 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_RETRY; 134 sc->rlayer.wpend_tot = templ.buflen; 135 sc->rlayer.wpend_type = templ.type; 136 sc->rlayer.wpend_buf = templ.buf; 137 } else { 138 /* 139 * Alert sent to BIO - now flush. If the message does not get sent due 140 * to non-blocking IO, we will not worry too much. 141 */ 142 (void)BIO_flush(sc->wbio); 143 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE; 144 145 if (sc->msg_callback) 146 sc->msg_callback(1, sc->version, SSL3_RT_ALERT, sc->s3.send_alert, 147 2, s, sc->msg_callback_arg); 148 149 if (sc->info_callback != NULL) 150 cb = sc->info_callback; 151 else if (s->ctx->info_callback != NULL) 152 cb = s->ctx->info_callback; 153 154 if (cb != NULL) { 155 j = (sc->s3.send_alert[0] << 8) | sc->s3.send_alert[1]; 156 cb(s, SSL_CB_WRITE_ALERT, j); 157 } 158 } 159 return i; 160 } 161