| 1 | /*
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| 2 | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <stdlib.h>
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| 12 | #include <string.h>
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| 13 | #include <errno.h>
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| 14 | #include <openssl/crypto.h>
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| 15 | #include "internal/bio.h"
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| 16 | #include <openssl/err.h>
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| 17 | #include "ssl_local.h"
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| 18 |
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| 19 | static int ssl_write(BIO *h, const char *buf, size_t size, size_t *written);
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| 20 | static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes);
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| 21 | static int ssl_puts(BIO *h, const char *str);
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| 22 | static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 23 | static int ssl_new(BIO *h);
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| 24 | static int ssl_free(BIO *data);
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| 25 | static long ssl_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
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| 26 | typedef struct bio_ssl_st {
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| 27 | SSL *ssl; /* The ssl handle :-) */
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| 28 | /* re-negotiate every time the total number of bytes is this size */
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| 29 | int num_renegotiates;
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| 30 | unsigned long renegotiate_count;
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| 31 | size_t byte_count;
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| 32 | unsigned long renegotiate_timeout;
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| 33 | unsigned long last_time;
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| 34 | } BIO_SSL;
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| 35 |
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| 36 | static const BIO_METHOD methods_sslp = {
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| 37 | BIO_TYPE_SSL,
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| 38 | "ssl",
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| 39 | ssl_write,
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| 40 | NULL, /* ssl_write_old, */
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| 41 | ssl_read,
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| 42 | NULL, /* ssl_read_old, */
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| 43 | ssl_puts,
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| 44 | NULL, /* ssl_gets, */
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| 45 | ssl_ctrl,
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| 46 | ssl_new,
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| 47 | ssl_free,
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| 48 | ssl_callback_ctrl,
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| 49 | };
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| 50 |
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| 51 | const BIO_METHOD *BIO_f_ssl(void)
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| 52 | {
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| 53 | return &methods_sslp;
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| 54 | }
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| 55 |
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| 56 | static int ssl_new(BIO *bi)
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| 57 | {
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| 58 | BIO_SSL *bs = OPENSSL_zalloc(sizeof(*bs));
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| 59 |
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| 60 | if (bs == NULL) {
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| 61 | BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
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| 62 | return 0;
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| 63 | }
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| 64 | BIO_set_init(bi, 0);
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| 65 | BIO_set_data(bi, bs);
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| 66 | /* Clear all flags */
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| 67 | BIO_clear_flags(bi, ~0);
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| 68 |
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| 69 | return 1;
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| 70 | }
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| 71 |
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| 72 | static int ssl_free(BIO *a)
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| 73 | {
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| 74 | BIO_SSL *bs;
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| 75 |
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| 76 | if (a == NULL)
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| 77 | return 0;
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| 78 | bs = BIO_get_data(a);
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| 79 | if (bs->ssl != NULL)
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| 80 | SSL_shutdown(bs->ssl);
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| 81 | if (BIO_get_shutdown(a)) {
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| 82 | if (BIO_get_init(a))
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| 83 | SSL_free(bs->ssl);
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| 84 | /* Clear all flags */
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| 85 | BIO_clear_flags(a, ~0);
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| 86 | BIO_set_init(a, 0);
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| 87 | }
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| 88 | OPENSSL_free(bs);
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| 89 | return 1;
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| 90 | }
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| 91 |
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| 92 | static int ssl_read(BIO *b, char *buf, size_t size, size_t *readbytes)
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| 93 | {
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| 94 | int ret = 1;
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| 95 | BIO_SSL *sb;
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| 96 | SSL *ssl;
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| 97 | int retry_reason = 0;
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| 98 | int r = 0;
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| 99 |
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| 100 | if (buf == NULL)
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| 101 | return 0;
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| 102 | sb = BIO_get_data(b);
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| 103 | ssl = sb->ssl;
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| 104 |
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| 105 | BIO_clear_retry_flags(b);
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| 106 |
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| 107 | ret = ssl_read_internal(ssl, buf, size, readbytes);
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| 108 |
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| 109 | switch (SSL_get_error(ssl, ret)) {
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| 110 | case SSL_ERROR_NONE:
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| 111 | if (sb->renegotiate_count > 0) {
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| 112 | sb->byte_count += *readbytes;
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| 113 | if (sb->byte_count > sb->renegotiate_count) {
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| 114 | sb->byte_count = 0;
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| 115 | sb->num_renegotiates++;
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| 116 | SSL_renegotiate(ssl);
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| 117 | r = 1;
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| 118 | }
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| 119 | }
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| 120 | if ((sb->renegotiate_timeout > 0) && (!r)) {
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| 121 | unsigned long tm;
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| 122 |
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| 123 | tm = (unsigned long)time(NULL);
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| 124 | if (tm > sb->last_time + sb->renegotiate_timeout) {
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| 125 | sb->last_time = tm;
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| 126 | sb->num_renegotiates++;
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| 127 | SSL_renegotiate(ssl);
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| 128 | }
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| 129 | }
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| 130 |
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| 131 | break;
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| 132 | case SSL_ERROR_WANT_READ:
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| 133 | BIO_set_retry_read(b);
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| 134 | break;
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| 135 | case SSL_ERROR_WANT_WRITE:
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| 136 | BIO_set_retry_write(b);
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| 137 | break;
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| 138 | case SSL_ERROR_WANT_X509_LOOKUP:
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| 139 | BIO_set_retry_special(b);
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| 140 | retry_reason = BIO_RR_SSL_X509_LOOKUP;
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| 141 | break;
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| 142 | case SSL_ERROR_WANT_ACCEPT:
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| 143 | BIO_set_retry_special(b);
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| 144 | retry_reason = BIO_RR_ACCEPT;
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| 145 | break;
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| 146 | case SSL_ERROR_WANT_CONNECT:
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| 147 | BIO_set_retry_special(b);
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| 148 | retry_reason = BIO_RR_CONNECT;
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| 149 | break;
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| 150 | case SSL_ERROR_SYSCALL:
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| 151 | case SSL_ERROR_SSL:
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| 152 | case SSL_ERROR_ZERO_RETURN:
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| 153 | default:
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| 154 | break;
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| 155 | }
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| 156 |
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| 157 | BIO_set_retry_reason(b, retry_reason);
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| 158 |
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| 159 | return ret;
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| 160 | }
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| 161 |
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| 162 | static int ssl_write(BIO *b, const char *buf, size_t size, size_t *written)
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| 163 | {
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| 164 | int ret, r = 0;
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| 165 | int retry_reason = 0;
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| 166 | SSL *ssl;
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| 167 | BIO_SSL *bs;
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| 168 |
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| 169 | if (buf == NULL)
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| 170 | return 0;
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| 171 | bs = BIO_get_data(b);
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| 172 | ssl = bs->ssl;
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| 173 |
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| 174 | BIO_clear_retry_flags(b);
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| 175 |
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| 176 | ret = ssl_write_internal(ssl, buf, size, written);
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| 177 |
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| 178 | switch (SSL_get_error(ssl, ret)) {
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| 179 | case SSL_ERROR_NONE:
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| 180 | if (bs->renegotiate_count > 0) {
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| 181 | bs->byte_count += *written;
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| 182 | if (bs->byte_count > bs->renegotiate_count) {
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| 183 | bs->byte_count = 0;
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| 184 | bs->num_renegotiates++;
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| 185 | SSL_renegotiate(ssl);
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| 186 | r = 1;
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| 187 | }
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| 188 | }
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| 189 | if ((bs->renegotiate_timeout > 0) && (!r)) {
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| 190 | unsigned long tm;
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| 191 |
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| 192 | tm = (unsigned long)time(NULL);
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| 193 | if (tm > bs->last_time + bs->renegotiate_timeout) {
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| 194 | bs->last_time = tm;
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| 195 | bs->num_renegotiates++;
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| 196 | SSL_renegotiate(ssl);
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| 197 | }
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| 198 | }
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| 199 | break;
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| 200 | case SSL_ERROR_WANT_WRITE:
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| 201 | BIO_set_retry_write(b);
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| 202 | break;
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| 203 | case SSL_ERROR_WANT_READ:
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| 204 | BIO_set_retry_read(b);
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| 205 | break;
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| 206 | case SSL_ERROR_WANT_X509_LOOKUP:
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| 207 | BIO_set_retry_special(b);
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| 208 | retry_reason = BIO_RR_SSL_X509_LOOKUP;
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| 209 | break;
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| 210 | case SSL_ERROR_WANT_CONNECT:
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| 211 | BIO_set_retry_special(b);
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| 212 | retry_reason = BIO_RR_CONNECT;
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| 213 | case SSL_ERROR_SYSCALL:
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| 214 | case SSL_ERROR_SSL:
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| 215 | default:
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| 216 | break;
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| 217 | }
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| 218 |
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| 219 | BIO_set_retry_reason(b, retry_reason);
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| 220 |
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| 221 | return ret;
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| 222 | }
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| 223 |
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| 224 | static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 225 | {
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| 226 | SSL **sslp, *ssl;
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| 227 | BIO_SSL *bs, *dbs;
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| 228 | BIO *dbio, *bio;
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| 229 | long ret = 1;
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| 230 | BIO *next;
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| 231 |
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| 232 | bs = BIO_get_data(b);
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| 233 | next = BIO_next(b);
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| 234 | ssl = bs->ssl;
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| 235 | if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))
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| 236 | return 0;
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| 237 | switch (cmd) {
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| 238 | case BIO_CTRL_RESET:
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| 239 | SSL_shutdown(ssl);
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| 240 |
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| 241 | if (ssl->handshake_func == ssl->method->ssl_connect)
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| 242 | SSL_set_connect_state(ssl);
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| 243 | else if (ssl->handshake_func == ssl->method->ssl_accept)
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| 244 | SSL_set_accept_state(ssl);
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| 245 |
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| 246 | if (!SSL_clear(ssl)) {
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| 247 | ret = 0;
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| 248 | break;
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| 249 | }
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| 250 |
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| 251 | if (next != NULL)
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| 252 | ret = BIO_ctrl(next, cmd, num, ptr);
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| 253 | else if (ssl->rbio != NULL)
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| 254 | ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
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| 255 | else
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| 256 | ret = 1;
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| 257 | break;
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| 258 | case BIO_CTRL_INFO:
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| 259 | ret = 0;
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| 260 | break;
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| 261 | case BIO_C_SSL_MODE:
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| 262 | if (num) /* client mode */
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| 263 | SSL_set_connect_state(ssl);
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| 264 | else
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| 265 | SSL_set_accept_state(ssl);
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| 266 | break;
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| 267 | case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
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| 268 | ret = bs->renegotiate_timeout;
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| 269 | if (num < 60)
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| 270 | num = 5;
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| 271 | bs->renegotiate_timeout = (unsigned long)num;
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| 272 | bs->last_time = (unsigned long)time(NULL);
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| 273 | break;
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| 274 | case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
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| 275 | ret = bs->renegotiate_count;
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| 276 | if ((long)num >= 512)
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| 277 | bs->renegotiate_count = (unsigned long)num;
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| 278 | break;
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| 279 | case BIO_C_GET_SSL_NUM_RENEGOTIATES:
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| 280 | ret = bs->num_renegotiates;
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| 281 | break;
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| 282 | case BIO_C_SET_SSL:
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| 283 | if (ssl != NULL) {
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| 284 | ssl_free(b);
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| 285 | if (!ssl_new(b))
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| 286 | return 0;
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| 287 | bs = BIO_get_data(b);
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| 288 | }
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| 289 | BIO_set_shutdown(b, num);
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| 290 | ssl = (SSL *)ptr;
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| 291 | bs->ssl = ssl;
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| 292 | bio = SSL_get_rbio(ssl);
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| 293 | if (bio != NULL) {
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| 294 | if (next != NULL)
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| 295 | BIO_push(bio, next);
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| 296 | BIO_set_next(b, bio);
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| 297 | BIO_up_ref(bio);
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| 298 | }
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| 299 | BIO_set_init(b, 1);
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| 300 | break;
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| 301 | case BIO_C_GET_SSL:
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| 302 | if (ptr != NULL) {
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| 303 | sslp = (SSL **)ptr;
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| 304 | *sslp = ssl;
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| 305 | } else
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| 306 | ret = 0;
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| 307 | break;
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| 308 | case BIO_CTRL_GET_CLOSE:
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| 309 | ret = BIO_get_shutdown(b);
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| 310 | break;
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| 311 | case BIO_CTRL_SET_CLOSE:
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| 312 | BIO_set_shutdown(b, (int)num);
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| 313 | break;
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| 314 | case BIO_CTRL_WPENDING:
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| 315 | ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
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| 316 | break;
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| 317 | case BIO_CTRL_PENDING:
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| 318 | ret = SSL_pending(ssl);
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| 319 | if (ret == 0)
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| 320 | ret = BIO_pending(ssl->rbio);
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| 321 | break;
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| 322 | case BIO_CTRL_FLUSH:
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| 323 | BIO_clear_retry_flags(b);
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| 324 | ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
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| 325 | BIO_copy_next_retry(b);
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| 326 | break;
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| 327 | case BIO_CTRL_PUSH:
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| 328 | if ((next != NULL) && (next != ssl->rbio)) {
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| 329 | /*
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| 330 | * We are going to pass ownership of next to the SSL object...but
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| 331 | * we don't own a reference to pass yet - so up ref
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| 332 | */
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| 333 | BIO_up_ref(next);
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| 334 | SSL_set_bio(ssl, next, next);
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| 335 | }
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| 336 | break;
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| 337 | case BIO_CTRL_POP:
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| 338 | /* Only detach if we are the BIO explicitly being popped */
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| 339 | if (b == ptr) {
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| 340 | /* This will clear the reference we obtained during push */
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| 341 | SSL_set_bio(ssl, NULL, NULL);
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| 342 | }
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| 343 | break;
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| 344 | case BIO_C_DO_STATE_MACHINE:
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| 345 | BIO_clear_retry_flags(b);
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| 346 |
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| 347 | BIO_set_retry_reason(b, 0);
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| 348 | ret = (int)SSL_do_handshake(ssl);
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| 349 |
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| 350 | switch (SSL_get_error(ssl, (int)ret)) {
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| 351 | case SSL_ERROR_WANT_READ:
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| 352 | BIO_set_flags(b, BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY);
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| 353 | break;
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| 354 | case SSL_ERROR_WANT_WRITE:
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| 355 | BIO_set_flags(b, BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY);
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| 356 | break;
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| 357 | case SSL_ERROR_WANT_CONNECT:
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| 358 | BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
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| 359 | BIO_set_retry_reason(b, BIO_get_retry_reason(next));
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| 360 | break;
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| 361 | case SSL_ERROR_WANT_X509_LOOKUP:
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| 362 | BIO_set_retry_special(b);
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| 363 | BIO_set_retry_reason(b, BIO_RR_SSL_X509_LOOKUP);
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| 364 | break;
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| 365 | default:
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| 366 | break;
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| 367 | }
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| 368 | break;
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| 369 | case BIO_CTRL_DUP:
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| 370 | dbio = (BIO *)ptr;
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| 371 | dbs = BIO_get_data(dbio);
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| 372 | SSL_free(dbs->ssl);
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| 373 | dbs->ssl = SSL_dup(ssl);
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| 374 | dbs->num_renegotiates = bs->num_renegotiates;
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| 375 | dbs->renegotiate_count = bs->renegotiate_count;
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| 376 | dbs->byte_count = bs->byte_count;
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| 377 | dbs->renegotiate_timeout = bs->renegotiate_timeout;
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| 378 | dbs->last_time = bs->last_time;
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| 379 | ret = (dbs->ssl != NULL);
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| 380 | break;
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| 381 | case BIO_C_GET_FD:
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| 382 | ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
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| 383 | break;
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| 384 | case BIO_CTRL_SET_CALLBACK:
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| 385 | ret = 0; /* use callback ctrl */
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| 386 | break;
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| 387 | default:
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| 388 | ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
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| 389 | break;
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| 390 | }
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| 391 | return ret;
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| 392 | }
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| 393 |
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| 394 | static long ssl_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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| 395 | {
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| 396 | SSL *ssl;
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| 397 | BIO_SSL *bs;
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| 398 | long ret = 1;
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| 399 |
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| 400 | bs = BIO_get_data(b);
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| 401 | ssl = bs->ssl;
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| 402 | switch (cmd) {
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| 403 | case BIO_CTRL_SET_CALLBACK:
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| 404 | ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
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| 405 | break;
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| 406 | default:
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| 407 | ret = 0;
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| 408 | break;
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| 409 | }
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| 410 | return ret;
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| 411 | }
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| 412 |
|
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| 413 | static int ssl_puts(BIO *bp, const char *str)
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| 414 | {
|
|---|
| 415 | int n, ret;
|
|---|
| 416 |
|
|---|
| 417 | n = strlen(str);
|
|---|
| 418 | ret = BIO_write(bp, str, n);
|
|---|
| 419 | return ret;
|
|---|
| 420 | }
|
|---|
| 421 |
|
|---|
| 422 | BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
|
|---|
| 423 | {
|
|---|
| 424 | #ifndef OPENSSL_NO_SOCK
|
|---|
| 425 | BIO *ret = NULL, *buf = NULL, *ssl = NULL;
|
|---|
| 426 |
|
|---|
| 427 | if ((buf = BIO_new(BIO_f_buffer())) == NULL)
|
|---|
| 428 | return NULL;
|
|---|
| 429 | if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)
|
|---|
| 430 | goto err;
|
|---|
| 431 | if ((ret = BIO_push(buf, ssl)) == NULL)
|
|---|
| 432 | goto err;
|
|---|
| 433 | return ret;
|
|---|
| 434 | err:
|
|---|
| 435 | BIO_free(buf);
|
|---|
| 436 | BIO_free(ssl);
|
|---|
| 437 | #endif
|
|---|
| 438 | return NULL;
|
|---|
| 439 | }
|
|---|
| 440 |
|
|---|
| 441 | BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
|
|---|
| 442 | {
|
|---|
| 443 | #ifndef OPENSSL_NO_SOCK
|
|---|
| 444 | BIO *ret = NULL, *con = NULL, *ssl = NULL;
|
|---|
| 445 |
|
|---|
| 446 | if ((con = BIO_new(BIO_s_connect())) == NULL)
|
|---|
| 447 | return NULL;
|
|---|
| 448 | if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)
|
|---|
| 449 | goto err;
|
|---|
| 450 | if ((ret = BIO_push(ssl, con)) == NULL)
|
|---|
| 451 | goto err;
|
|---|
| 452 | return ret;
|
|---|
| 453 | err:
|
|---|
| 454 | BIO_free(ssl);
|
|---|
| 455 | BIO_free(con);
|
|---|
| 456 | #endif
|
|---|
| 457 | return NULL;
|
|---|
| 458 | }
|
|---|
| 459 |
|
|---|
| 460 | BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
|
|---|
| 461 | {
|
|---|
| 462 | BIO *ret;
|
|---|
| 463 | SSL *ssl;
|
|---|
| 464 |
|
|---|
| 465 | if ((ret = BIO_new(BIO_f_ssl())) == NULL)
|
|---|
| 466 | return NULL;
|
|---|
| 467 | if ((ssl = SSL_new(ctx)) == NULL) {
|
|---|
| 468 | BIO_free(ret);
|
|---|
| 469 | return NULL;
|
|---|
| 470 | }
|
|---|
| 471 | if (client)
|
|---|
| 472 | SSL_set_connect_state(ssl);
|
|---|
| 473 | else
|
|---|
| 474 | SSL_set_accept_state(ssl);
|
|---|
| 475 |
|
|---|
| 476 | BIO_set_ssl(ret, ssl, BIO_CLOSE);
|
|---|
| 477 | return ret;
|
|---|
| 478 | }
|
|---|
| 479 |
|
|---|
| 480 | int BIO_ssl_copy_session_id(BIO *t, BIO *f)
|
|---|
| 481 | {
|
|---|
| 482 | BIO_SSL *tdata, *fdata;
|
|---|
| 483 | t = BIO_find_type(t, BIO_TYPE_SSL);
|
|---|
| 484 | f = BIO_find_type(f, BIO_TYPE_SSL);
|
|---|
| 485 | if ((t == NULL) || (f == NULL))
|
|---|
| 486 | return 0;
|
|---|
| 487 | tdata = BIO_get_data(t);
|
|---|
| 488 | fdata = BIO_get_data(f);
|
|---|
| 489 | if ((tdata->ssl == NULL) || (fdata->ssl == NULL))
|
|---|
| 490 | return 0;
|
|---|
| 491 | if (!SSL_copy_session_id(tdata->ssl, (fdata->ssl)))
|
|---|
| 492 | return 0;
|
|---|
| 493 | return 1;
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | void BIO_ssl_shutdown(BIO *b)
|
|---|
| 497 | {
|
|---|
| 498 | BIO_SSL *bdata;
|
|---|
| 499 |
|
|---|
| 500 | for (; b != NULL; b = BIO_next(b)) {
|
|---|
| 501 | if (BIO_method_type(b) != BIO_TYPE_SSL)
|
|---|
| 502 | continue;
|
|---|
| 503 | bdata = BIO_get_data(b);
|
|---|
| 504 | if (bdata != NULL && bdata->ssl != NULL)
|
|---|
| 505 | SSL_shutdown(bdata->ssl);
|
|---|
| 506 | }
|
|---|
| 507 | }
|
|---|
