mirror of
https://github.com/pineappleEA/pineapple-src.git
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297 lines
6.8 KiB
C
Executable File
297 lines
6.8 KiB
C
Executable File
/* $OpenBSD: ssl_ciphers.c,v 1.9 2020/09/15 15:28:38 schwarze Exp $ */
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/*
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* Copyright (c) 2015-2017 Doug Hogan <doug@openbsd.org>
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* Copyright (c) 2015-2018, 2020 Joel Sing <jsing@openbsd.org>
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* Copyright (c) 2019 Theo Buehler <tb@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <openssl/safestack.h>
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#include "bytestring.h"
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#include "ssl_locl.h"
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int
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ssl_cipher_in_list(STACK_OF(SSL_CIPHER) *ciphers, const SSL_CIPHER *cipher)
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{
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int i;
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for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
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if (sk_SSL_CIPHER_value(ciphers, i)->id == cipher->id)
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return 1;
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}
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return 0;
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}
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int
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ssl_cipher_allowed_in_version_range(const SSL_CIPHER *cipher, uint16_t min_ver,
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uint16_t max_ver)
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{
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/* XXX: We only support DTLSv1 which is effectively TLSv1.1 */
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if (min_ver == DTLS1_VERSION || max_ver == DTLS1_VERSION)
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min_ver = max_ver = TLS1_1_VERSION;
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switch(cipher->algorithm_ssl) {
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case SSL_SSLV3:
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if (min_ver <= TLS1_2_VERSION)
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return 1;
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break;
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case SSL_TLSV1_2:
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if (min_ver <= TLS1_2_VERSION && TLS1_2_VERSION <= max_ver)
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return 1;
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break;
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case SSL_TLSV1_3:
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if (min_ver <= TLS1_3_VERSION && TLS1_3_VERSION <= max_ver)
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return 1;
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break;
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}
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return 0;
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}
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int
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ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *ciphers, CBB *cbb)
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{
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SSL_CIPHER *cipher;
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int num_ciphers = 0;
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uint16_t min_vers, max_vers;
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int i;
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if (ciphers == NULL)
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return 0;
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if (!ssl_supported_version_range(s, &min_vers, &max_vers))
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return 0;
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for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
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if ((cipher = sk_SSL_CIPHER_value(ciphers, i)) == NULL)
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return 0;
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if (!ssl_cipher_allowed_in_version_range(cipher, min_vers,
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max_vers))
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continue;
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if (!CBB_add_u16(cbb, ssl3_cipher_get_value(cipher)))
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return 0;
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num_ciphers++;
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}
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/* Add SCSV if there are other ciphers and we're not renegotiating. */
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if (num_ciphers > 0 && !s->internal->renegotiate) {
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if (!CBB_add_u16(cbb, SSL3_CK_SCSV & SSL3_CK_VALUE_MASK))
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return 0;
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}
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if (!CBB_flush(cbb))
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return 0;
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return 1;
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}
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STACK_OF(SSL_CIPHER) *
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ssl_bytes_to_cipher_list(SSL *s, CBS *cbs)
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{
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STACK_OF(SSL_CIPHER) *ciphers = NULL;
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const SSL_CIPHER *cipher;
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uint16_t cipher_value, max_version;
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unsigned long cipher_id;
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S3I(s)->send_connection_binding = 0;
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if ((ciphers = sk_SSL_CIPHER_new_null()) == NULL) {
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SSLerror(s, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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while (CBS_len(cbs) > 0) {
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if (!CBS_get_u16(cbs, &cipher_value)) {
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SSLerror(s, SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
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goto err;
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}
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cipher_id = SSL3_CK_ID | cipher_value;
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if (cipher_id == SSL3_CK_SCSV) {
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/*
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* TLS_EMPTY_RENEGOTIATION_INFO_SCSV is fatal if
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* renegotiating.
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*/
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if (s->internal->renegotiate) {
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SSLerror(s, SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
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ssl3_send_alert(s, SSL3_AL_FATAL,
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SSL_AD_HANDSHAKE_FAILURE);
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goto err;
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}
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S3I(s)->send_connection_binding = 1;
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continue;
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}
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if (cipher_id == SSL3_CK_FALLBACK_SCSV) {
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/*
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* TLS_FALLBACK_SCSV indicates that the client
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* previously tried a higher protocol version.
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* Fail if the current version is an unexpected
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* downgrade.
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*/
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if (!ssl_downgrade_max_version(s, &max_version))
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goto err;
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if (s->version < max_version) {
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SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK);
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ssl3_send_alert(s, SSL3_AL_FATAL,
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SSL_AD_INAPPROPRIATE_FALLBACK);
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goto err;
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}
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continue;
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}
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if ((cipher = ssl3_get_cipher_by_value(cipher_value)) != NULL) {
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if (!sk_SSL_CIPHER_push(ciphers, cipher)) {
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SSLerror(s, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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}
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}
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return (ciphers);
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err:
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sk_SSL_CIPHER_free(ciphers);
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return (NULL);
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}
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struct ssl_tls13_ciphersuite {
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const char *name;
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const char *alias;
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unsigned long cid;
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};
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static const struct ssl_tls13_ciphersuite ssl_tls13_ciphersuites[] = {
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{
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.name = TLS1_3_TXT_AES_128_GCM_SHA256,
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.alias = "TLS_AES_128_GCM_SHA256",
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.cid = TLS1_3_CK_AES_128_GCM_SHA256,
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},
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{
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.name = TLS1_3_TXT_AES_256_GCM_SHA384,
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.alias = "TLS_AES_256_GCM_SHA384",
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.cid = TLS1_3_CK_AES_256_GCM_SHA384,
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},
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{
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.name = TLS1_3_TXT_CHACHA20_POLY1305_SHA256,
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.alias = "TLS_CHACHA20_POLY1305_SHA256",
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.cid = TLS1_3_CK_CHACHA20_POLY1305_SHA256,
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},
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{
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.name = TLS1_3_TXT_AES_128_CCM_SHA256,
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.alias = "TLS_AES_128_CCM_SHA256",
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.cid = TLS1_3_CK_AES_128_CCM_SHA256,
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},
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{
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.name = TLS1_3_TXT_AES_128_CCM_8_SHA256,
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.alias = "TLS_AES_128_CCM_8_SHA256",
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.cid = TLS1_3_CK_AES_128_CCM_8_SHA256,
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},
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{
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.name = NULL,
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},
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};
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int
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ssl_parse_ciphersuites(STACK_OF(SSL_CIPHER) **out_ciphers, const char *str)
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{
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const struct ssl_tls13_ciphersuite *ciphersuite;
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STACK_OF(SSL_CIPHER) *ciphers;
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const SSL_CIPHER *cipher;
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char *s = NULL;
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char *p, *q;
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int i;
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int ret = 0;
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if ((ciphers = sk_SSL_CIPHER_new_null()) == NULL)
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goto err;
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/* An empty string is valid and means no ciphers. */
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if (strcmp(str, "") == 0)
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goto done;
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if ((s = strdup(str)) == NULL)
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goto err;
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q = s;
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while ((p = strsep(&q, ":")) != NULL) {
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ciphersuite = &ssl_tls13_ciphersuites[0];
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for (i = 0; ciphersuite->name != NULL; i++) {
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if (strcmp(p, ciphersuite->name) == 0)
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break;
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if (strcmp(p, ciphersuite->alias) == 0)
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break;
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ciphersuite = &ssl_tls13_ciphersuites[i];
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}
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if (ciphersuite->name == NULL)
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goto err;
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/* We know about the cipher suite, but it is not supported. */
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if ((cipher = ssl3_get_cipher_by_id(ciphersuite->cid)) == NULL)
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continue;
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if (!sk_SSL_CIPHER_push(ciphers, cipher))
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goto err;
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}
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done:
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sk_SSL_CIPHER_free(*out_ciphers);
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*out_ciphers = ciphers;
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ciphers = NULL;
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ret = 1;
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err:
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sk_SSL_CIPHER_free(ciphers);
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free(s);
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return ret;
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}
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int
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ssl_merge_cipherlists(STACK_OF(SSL_CIPHER) *cipherlist,
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STACK_OF(SSL_CIPHER) *cipherlist_tls13,
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STACK_OF(SSL_CIPHER) **out_cipherlist)
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{
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STACK_OF(SSL_CIPHER) *ciphers = NULL;
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const SSL_CIPHER *cipher;
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int i, ret = 0;
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if ((ciphers = sk_SSL_CIPHER_dup(cipherlist_tls13)) == NULL)
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goto err;
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for (i = 0; i < sk_SSL_CIPHER_num(cipherlist); i++) {
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cipher = sk_SSL_CIPHER_value(cipherlist, i);
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if (cipher->algorithm_ssl == SSL_TLSV1_3)
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continue;
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if (!sk_SSL_CIPHER_push(ciphers, cipher))
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goto err;
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}
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sk_SSL_CIPHER_free(*out_cipherlist);
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*out_cipherlist = ciphers;
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ciphers = NULL;
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ret = 1;
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err:
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sk_SSL_CIPHER_free(ciphers);
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return ret;
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}
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