[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 <errno.h>
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| 12 | #include "bio_lcl.h"
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| 13 |
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| 14 | #ifndef OPENSSL_NO_SOCK
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| 15 |
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| 16 | typedef struct bio_accept_st {
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| 17 | int state;
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| 18 | int accept_family;
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| 19 | int bind_mode; /* Socket mode for BIO_listen */
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| 20 | int accepted_mode; /* Socket mode for BIO_accept (set on accepted sock) */
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| 21 | char *param_addr;
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| 22 | char *param_serv;
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| 23 |
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| 24 | int accept_sock;
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| 25 |
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| 26 | BIO_ADDRINFO *addr_first;
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| 27 | const BIO_ADDRINFO *addr_iter;
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| 28 | BIO_ADDR cache_accepting_addr; /* Useful if we asked for port 0 */
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| 29 | char *cache_accepting_name, *cache_accepting_serv;
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| 30 | BIO_ADDR cache_peer_addr;
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| 31 | char *cache_peer_name, *cache_peer_serv;
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| 32 |
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| 33 | BIO *bio_chain;
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| 34 | } BIO_ACCEPT;
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| 35 |
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| 36 | static int acpt_write(BIO *h, const char *buf, int num);
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| 37 | static int acpt_read(BIO *h, char *buf, int size);
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| 38 | static int acpt_puts(BIO *h, const char *str);
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| 39 | static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 40 | static int acpt_new(BIO *h);
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| 41 | static int acpt_free(BIO *data);
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| 42 | static int acpt_state(BIO *b, BIO_ACCEPT *c);
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| 43 | static void acpt_close_socket(BIO *data);
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| 44 | static BIO_ACCEPT *BIO_ACCEPT_new(void);
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| 45 | static void BIO_ACCEPT_free(BIO_ACCEPT *a);
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| 46 |
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| 47 | # define ACPT_S_BEFORE 1
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| 48 | # define ACPT_S_GET_ADDR 2
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| 49 | # define ACPT_S_CREATE_SOCKET 3
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| 50 | # define ACPT_S_LISTEN 4
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| 51 | # define ACPT_S_ACCEPT 5
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| 52 | # define ACPT_S_OK 6
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| 53 |
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| 54 | static const BIO_METHOD methods_acceptp = {
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| 55 | BIO_TYPE_ACCEPT,
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| 56 | "socket accept",
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| 57 | acpt_write,
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| 58 | acpt_read,
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| 59 | acpt_puts,
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| 60 | NULL, /* connect_gets, */
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| 61 | acpt_ctrl,
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| 62 | acpt_new,
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| 63 | acpt_free,
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| 64 | NULL,
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| 65 | };
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| 66 |
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| 67 | const BIO_METHOD *BIO_s_accept(void)
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| 68 | {
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| 69 | return (&methods_acceptp);
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| 70 | }
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| 71 |
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| 72 | static int acpt_new(BIO *bi)
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| 73 | {
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| 74 | BIO_ACCEPT *ba;
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| 75 |
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| 76 | bi->init = 0;
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| 77 | bi->num = (int)INVALID_SOCKET;
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| 78 | bi->flags = 0;
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| 79 | if ((ba = BIO_ACCEPT_new()) == NULL)
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| 80 | return (0);
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| 81 | bi->ptr = (char *)ba;
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| 82 | ba->state = ACPT_S_BEFORE;
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| 83 | bi->shutdown = 1;
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| 84 | return (1);
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| 85 | }
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| 86 |
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| 87 | static BIO_ACCEPT *BIO_ACCEPT_new(void)
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| 88 | {
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| 89 | BIO_ACCEPT *ret;
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| 90 |
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| 91 | if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
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| 92 | return (NULL);
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| 93 | ret->accept_family = BIO_FAMILY_IPANY;
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| 94 | ret->accept_sock = (int)INVALID_SOCKET;
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| 95 | return (ret);
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| 96 | }
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| 97 |
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| 98 | static void BIO_ACCEPT_free(BIO_ACCEPT *a)
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| 99 | {
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| 100 | if (a == NULL)
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| 101 | return;
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| 102 |
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| 103 | OPENSSL_free(a->param_addr);
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| 104 | OPENSSL_free(a->param_serv);
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| 105 | BIO_ADDRINFO_free(a->addr_first);
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| 106 | OPENSSL_free(a->cache_accepting_name);
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| 107 | OPENSSL_free(a->cache_accepting_serv);
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| 108 | OPENSSL_free(a->cache_peer_name);
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| 109 | OPENSSL_free(a->cache_peer_serv);
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| 110 | BIO_free(a->bio_chain);
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| 111 | OPENSSL_free(a);
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| 112 | }
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| 113 |
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| 114 | static void acpt_close_socket(BIO *bio)
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| 115 | {
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| 116 | BIO_ACCEPT *c;
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| 117 |
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| 118 | c = (BIO_ACCEPT *)bio->ptr;
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| 119 | if (c->accept_sock != (int)INVALID_SOCKET) {
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| 120 | shutdown(c->accept_sock, 2);
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| 121 | closesocket(c->accept_sock);
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| 122 | c->accept_sock = (int)INVALID_SOCKET;
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| 123 | bio->num = (int)INVALID_SOCKET;
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| 124 | }
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| 125 | }
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| 126 |
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| 127 | static int acpt_free(BIO *a)
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| 128 | {
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| 129 | BIO_ACCEPT *data;
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| 130 |
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| 131 | if (a == NULL)
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| 132 | return (0);
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| 133 | data = (BIO_ACCEPT *)a->ptr;
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| 134 |
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| 135 | if (a->shutdown) {
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| 136 | acpt_close_socket(a);
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| 137 | BIO_ACCEPT_free(data);
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| 138 | a->ptr = NULL;
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| 139 | a->flags = 0;
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| 140 | a->init = 0;
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| 141 | }
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| 142 | return (1);
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| 143 | }
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| 144 |
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| 145 | static int acpt_state(BIO *b, BIO_ACCEPT *c)
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| 146 | {
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| 147 | BIO *bio = NULL, *dbio;
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| 148 | int s = -1, ret = -1;
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| 149 |
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| 150 | for (;;) {
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| 151 | switch (c->state) {
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| 152 | case ACPT_S_BEFORE:
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| 153 | if (c->param_addr == NULL && c->param_serv == NULL) {
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| 154 | BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_ADDR_OR_SERVICE_SPECIFIED);
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| 155 | ERR_add_error_data(4,
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| 156 | "hostname=", c->param_addr,
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| 157 | " service=", c->param_serv);
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| 158 | goto exit_loop;
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| 159 | }
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| 160 |
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| 161 | /* Because we're starting a new bind, any cached name and serv
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| 162 | * are now obsolete and need to be cleaned out.
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| 163 | * QUESTION: should this be done in acpt_close_socket() instead?
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| 164 | */
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| 165 | OPENSSL_free(c->cache_accepting_name);
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| 166 | c->cache_accepting_name = NULL;
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| 167 | OPENSSL_free(c->cache_accepting_serv);
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| 168 | c->cache_accepting_serv = NULL;
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| 169 | OPENSSL_free(c->cache_peer_name);
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| 170 | c->cache_peer_name = NULL;
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| 171 | OPENSSL_free(c->cache_peer_serv);
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| 172 | c->cache_peer_serv = NULL;
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| 173 |
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| 174 | c->state = ACPT_S_GET_ADDR;
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| 175 | break;
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| 176 |
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| 177 | case ACPT_S_GET_ADDR:
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| 178 | {
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| 179 | int family = AF_UNSPEC;
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| 180 | switch (c->accept_family) {
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| 181 | case BIO_FAMILY_IPV6:
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| 182 | if (1) { /* This is a trick we use to avoid bit rot.
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| 183 | * at least the "else" part will always be
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| 184 | * compiled.
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| 185 | */
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| 186 | #ifdef AF_INET6
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| 187 | family = AF_INET6;
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| 188 | } else {
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| 189 | #endif
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| 190 | BIOerr(BIO_F_ACPT_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
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| 191 | goto exit_loop;
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| 192 | }
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| 193 | break;
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| 194 | case BIO_FAMILY_IPV4:
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| 195 | family = AF_INET;
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| 196 | break;
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| 197 | case BIO_FAMILY_IPANY:
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| 198 | family = AF_UNSPEC;
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| 199 | break;
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| 200 | default:
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| 201 | BIOerr(BIO_F_ACPT_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
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| 202 | goto exit_loop;
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| 203 | }
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| 204 | if (BIO_lookup(c->param_addr, c->param_serv, BIO_LOOKUP_SERVER,
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| 205 | family, SOCK_STREAM, &c->addr_first) == 0)
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| 206 | goto exit_loop;
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| 207 | }
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| 208 | if (c->addr_first == NULL) {
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| 209 | BIOerr(BIO_F_ACPT_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
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| 210 | goto exit_loop;
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| 211 | }
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| 212 | /* We're currently not iterating, but set this as preparation
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| 213 | * for possible future development in that regard
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| 214 | */
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| 215 | c->addr_iter = c->addr_first;
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| 216 | c->state = ACPT_S_CREATE_SOCKET;
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| 217 | break;
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| 218 |
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| 219 | case ACPT_S_CREATE_SOCKET:
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| 220 | ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
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| 221 | BIO_ADDRINFO_socktype(c->addr_iter),
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| 222 | BIO_ADDRINFO_protocol(c->addr_iter), 0);
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| 223 | if (ret == (int)INVALID_SOCKET) {
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| 224 | SYSerr(SYS_F_SOCKET, get_last_socket_error());
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| 225 | ERR_add_error_data(4,
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| 226 | "hostname=", c->param_addr,
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| 227 | " service=", c->param_serv);
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| 228 | BIOerr(BIO_F_ACPT_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
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| 229 | goto exit_loop;
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| 230 | }
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| 231 | c->accept_sock = ret;
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| 232 | b->num = ret;
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| 233 | c->state = ACPT_S_LISTEN;
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| 234 | break;
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| 235 |
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| 236 | case ACPT_S_LISTEN:
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| 237 | {
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| 238 | if (!BIO_listen(c->accept_sock,
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| 239 | BIO_ADDRINFO_address(c->addr_iter),
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| 240 | c->bind_mode)) {
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| 241 | BIO_closesocket(c->accept_sock);
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| 242 | goto exit_loop;
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | {
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| 247 | union BIO_sock_info_u info;
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| 248 |
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| 249 | info.addr = &c->cache_accepting_addr;
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| 250 | if (!BIO_sock_info(c->accept_sock, BIO_SOCK_INFO_ADDRESS,
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| 251 | &info)) {
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| 252 | BIO_closesocket(c->accept_sock);
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| 253 | goto exit_loop;
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| 254 | }
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| 255 | }
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| 256 |
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| 257 | c->cache_accepting_name =
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| 258 | BIO_ADDR_hostname_string(&c->cache_accepting_addr, 1);
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| 259 | c->cache_accepting_serv =
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| 260 | BIO_ADDR_service_string(&c->cache_accepting_addr, 1);
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| 261 | c->state = ACPT_S_ACCEPT;
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| 262 | s = -1;
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| 263 | ret = 1;
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| 264 | goto end;
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| 265 |
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| 266 | case ACPT_S_ACCEPT:
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| 267 | if (b->next_bio != NULL) {
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| 268 | c->state = ACPT_S_OK;
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| 269 | break;
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| 270 | }
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| 271 | BIO_clear_retry_flags(b);
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| 272 | b->retry_reason = 0;
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| 273 |
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| 274 | s = BIO_accept_ex(c->accept_sock, &c->cache_peer_addr,
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| 275 | c->accepted_mode);
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| 276 |
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| 277 | /* If the returned socket is invalid, this might still be
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| 278 | * retryable
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| 279 | */
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| 280 | if (s < 0) {
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| 281 | if (BIO_sock_should_retry(s)) {
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| 282 | BIO_set_retry_special(b);
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| 283 | b->retry_reason = BIO_RR_ACCEPT;
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| 284 | goto end;
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| 285 | }
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| 286 | }
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| 287 |
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| 288 | /* If it wasn't retryable, we fail */
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| 289 | if (s < 0) {
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| 290 | ret = s;
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| 291 | goto exit_loop;
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| 292 | }
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| 293 |
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| 294 | bio = BIO_new_socket(s, BIO_CLOSE);
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| 295 | if (bio == NULL)
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| 296 | goto exit_loop;
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| 297 |
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| 298 | BIO_set_callback(bio, BIO_get_callback(b));
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| 299 | BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
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| 300 |
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| 301 | /*
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| 302 | * If the accept BIO has an bio_chain, we dup it and put the new
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| 303 | * socket at the end.
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| 304 | */
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| 305 | if (c->bio_chain != NULL) {
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| 306 | if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
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| 307 | goto exit_loop;
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| 308 | if (!BIO_push(dbio, bio))
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| 309 | goto exit_loop;
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| 310 | bio = dbio;
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| 311 | }
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| 312 | if (BIO_push(b, bio) == NULL)
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| 313 | goto exit_loop;
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| 314 |
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| 315 | c->cache_peer_name =
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| 316 | BIO_ADDR_hostname_string(&c->cache_peer_addr, 1);
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| 317 | c->cache_peer_serv =
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| 318 | BIO_ADDR_service_string(&c->cache_peer_addr, 1);
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| 319 | c->state = ACPT_S_OK;
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| 320 | bio = NULL;
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| 321 | ret = 1;
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| 322 | goto end;
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| 323 |
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| 324 | case ACPT_S_OK:
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| 325 | if (b->next_bio == NULL) {
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| 326 | c->state = ACPT_S_ACCEPT;
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| 327 | break;
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| 328 | }
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| 329 | ret = 1;
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| 330 | goto end;
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| 331 |
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| 332 | default:
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| 333 | ret = 0;
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| 334 | goto end;
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| 335 | }
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| 336 | }
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| 337 |
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| 338 | exit_loop:
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| 339 | if (bio != NULL)
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| 340 | BIO_free(bio);
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| 341 | else if (s >= 0)
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| 342 | BIO_closesocket(s);
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| 343 | end:
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| 344 | return ret;
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| 345 | }
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| 346 |
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| 347 | static int acpt_read(BIO *b, char *out, int outl)
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| 348 | {
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| 349 | int ret = 0;
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| 350 | BIO_ACCEPT *data;
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| 351 |
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| 352 | BIO_clear_retry_flags(b);
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| 353 | data = (BIO_ACCEPT *)b->ptr;
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| 354 |
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| 355 | while (b->next_bio == NULL) {
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| 356 | ret = acpt_state(b, data);
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| 357 | if (ret <= 0)
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| 358 | return (ret);
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| 359 | }
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| 360 |
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| 361 | ret = BIO_read(b->next_bio, out, outl);
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| 362 | BIO_copy_next_retry(b);
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| 363 | return (ret);
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| 364 | }
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| 365 |
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| 366 | static int acpt_write(BIO *b, const char *in, int inl)
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| 367 | {
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| 368 | int ret;
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| 369 | BIO_ACCEPT *data;
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| 370 |
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| 371 | BIO_clear_retry_flags(b);
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| 372 | data = (BIO_ACCEPT *)b->ptr;
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| 373 |
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| 374 | while (b->next_bio == NULL) {
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| 375 | ret = acpt_state(b, data);
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| 376 | if (ret <= 0)
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| 377 | return (ret);
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| 378 | }
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| 379 |
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| 380 | ret = BIO_write(b->next_bio, in, inl);
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| 381 | BIO_copy_next_retry(b);
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| 382 | return (ret);
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| 383 | }
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| 384 |
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| 385 | static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 386 | {
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| 387 | int *ip;
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| 388 | long ret = 1;
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| 389 | BIO_ACCEPT *data;
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| 390 | char **pp;
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| 391 |
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| 392 | data = (BIO_ACCEPT *)b->ptr;
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| 393 |
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| 394 | switch (cmd) {
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| 395 | case BIO_CTRL_RESET:
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| 396 | ret = 0;
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| 397 | data->state = ACPT_S_BEFORE;
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| 398 | acpt_close_socket(b);
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| 399 | BIO_ADDRINFO_free(data->addr_first);
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| 400 | data->addr_first = NULL;
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| 401 | b->flags = 0;
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| 402 | break;
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| 403 | case BIO_C_DO_STATE_MACHINE:
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| 404 | /* use this one to start the connection */
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| 405 | ret = (long)acpt_state(b, data);
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| 406 | break;
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| 407 | case BIO_C_SET_ACCEPT:
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| 408 | if (ptr != NULL) {
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| 409 | if (num == 0) {
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| 410 | char *hold_serv = data->param_serv;
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| 411 | /* We affect the hostname regardless. However, the input
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| 412 | * string might contain a host:service spec, so we must
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| 413 | * parse it, which might or might not affect the service
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| 414 | */
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| 415 | OPENSSL_free(data->param_addr);
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| 416 | data->param_addr = NULL;
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| 417 | ret = BIO_parse_hostserv(ptr,
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| 418 | &data->param_addr,
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| 419 | &data->param_serv,
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| 420 | BIO_PARSE_PRIO_SERV);
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| 421 | if (hold_serv != data->param_serv)
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| 422 | OPENSSL_free(hold_serv);
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| 423 | b->init = 1;
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| 424 | } else if (num == 1) {
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| 425 | OPENSSL_free(data->param_serv);
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| 426 | data->param_serv = BUF_strdup(ptr);
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| 427 | b->init = 1;
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| 428 | } else if (num == 2) {
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| 429 | data->bind_mode |= BIO_SOCK_NONBLOCK;
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| 430 | } else if (num == 3) {
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| 431 | BIO_free(data->bio_chain);
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| 432 | data->bio_chain = (BIO *)ptr;
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| 433 | } else if (num == 4) {
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| 434 | data->accept_family = *(int *)ptr;
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| 435 | }
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| 436 | } else {
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| 437 | if (num == 2) {
|
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| 438 | data->bind_mode &= ~BIO_SOCK_NONBLOCK;
|
---|
| 439 | }
|
---|
| 440 | }
|
---|
| 441 | break;
|
---|
| 442 | case BIO_C_SET_NBIO:
|
---|
| 443 | if (num != 0)
|
---|
| 444 | data->accepted_mode |= BIO_SOCK_NONBLOCK;
|
---|
| 445 | else
|
---|
| 446 | data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
|
---|
| 447 | break;
|
---|
| 448 | case BIO_C_SET_FD:
|
---|
| 449 | b->init = 1;
|
---|
| 450 | b->num = *((int *)ptr);
|
---|
| 451 | data->accept_sock = b->num;
|
---|
| 452 | data->state = ACPT_S_ACCEPT;
|
---|
| 453 | b->shutdown = (int)num;
|
---|
| 454 | b->init = 1;
|
---|
| 455 | break;
|
---|
| 456 | case BIO_C_GET_FD:
|
---|
| 457 | if (b->init) {
|
---|
| 458 | ip = (int *)ptr;
|
---|
| 459 | if (ip != NULL)
|
---|
| 460 | *ip = data->accept_sock;
|
---|
| 461 | ret = data->accept_sock;
|
---|
| 462 | } else
|
---|
| 463 | ret = -1;
|
---|
| 464 | break;
|
---|
| 465 | case BIO_C_GET_ACCEPT:
|
---|
| 466 | if (b->init) {
|
---|
| 467 | if (num == 0 && ptr != NULL) {
|
---|
| 468 | pp = (char **)ptr;
|
---|
| 469 | *pp = data->cache_accepting_name;
|
---|
| 470 | } else if (num == 1 && ptr != NULL) {
|
---|
| 471 | pp = (char **)ptr;
|
---|
| 472 | *pp = data->cache_accepting_serv;
|
---|
| 473 | } else if (num == 2 && ptr != NULL) {
|
---|
| 474 | pp = (char **)ptr;
|
---|
| 475 | *pp = data->cache_peer_name;
|
---|
| 476 | } else if (num == 3 && ptr != NULL) {
|
---|
| 477 | pp = (char **)ptr;
|
---|
| 478 | *pp = data->cache_peer_serv;
|
---|
| 479 | } else if (num == 4) {
|
---|
| 480 | switch (BIO_ADDRINFO_family(data->addr_iter)) {
|
---|
| 481 | #ifdef AF_INET6
|
---|
| 482 | case AF_INET6:
|
---|
| 483 | ret = BIO_FAMILY_IPV6;
|
---|
| 484 | break;
|
---|
| 485 | #endif
|
---|
| 486 | case AF_INET:
|
---|
| 487 | ret = BIO_FAMILY_IPV4;
|
---|
| 488 | break;
|
---|
| 489 | case 0:
|
---|
| 490 | ret = data->accept_family;
|
---|
| 491 | break;
|
---|
| 492 | default:
|
---|
| 493 | ret = -1;
|
---|
| 494 | break;
|
---|
| 495 | }
|
---|
| 496 | } else
|
---|
| 497 | ret = -1;
|
---|
| 498 | } else
|
---|
| 499 | ret = -1;
|
---|
| 500 | break;
|
---|
| 501 | case BIO_CTRL_GET_CLOSE:
|
---|
| 502 | ret = b->shutdown;
|
---|
| 503 | break;
|
---|
| 504 | case BIO_CTRL_SET_CLOSE:
|
---|
| 505 | b->shutdown = (int)num;
|
---|
| 506 | break;
|
---|
| 507 | case BIO_CTRL_PENDING:
|
---|
| 508 | case BIO_CTRL_WPENDING:
|
---|
| 509 | ret = 0;
|
---|
| 510 | break;
|
---|
| 511 | case BIO_CTRL_FLUSH:
|
---|
| 512 | break;
|
---|
| 513 | case BIO_C_SET_BIND_MODE:
|
---|
| 514 | data->bind_mode = (int)num;
|
---|
| 515 | break;
|
---|
| 516 | case BIO_C_GET_BIND_MODE:
|
---|
| 517 | ret = (long)data->bind_mode;
|
---|
| 518 | break;
|
---|
| 519 | case BIO_CTRL_DUP:
|
---|
| 520 | /*- dbio=(BIO *)ptr;
|
---|
| 521 | if (data->param_port) EAY EAY
|
---|
| 522 | BIO_set_port(dbio,data->param_port);
|
---|
| 523 | if (data->param_hostname)
|
---|
| 524 | BIO_set_hostname(dbio,data->param_hostname);
|
---|
| 525 | BIO_set_nbio(dbio,data->nbio); */
|
---|
| 526 | break;
|
---|
| 527 |
|
---|
| 528 | default:
|
---|
| 529 | ret = 0;
|
---|
| 530 | break;
|
---|
| 531 | }
|
---|
| 532 | return (ret);
|
---|
| 533 | }
|
---|
| 534 |
|
---|
| 535 | static int acpt_puts(BIO *bp, const char *str)
|
---|
| 536 | {
|
---|
| 537 | int n, ret;
|
---|
| 538 |
|
---|
| 539 | n = strlen(str);
|
---|
| 540 | ret = acpt_write(bp, str, n);
|
---|
| 541 | return (ret);
|
---|
| 542 | }
|
---|
| 543 |
|
---|
| 544 | BIO *BIO_new_accept(const char *str)
|
---|
| 545 | {
|
---|
| 546 | BIO *ret;
|
---|
| 547 |
|
---|
| 548 | ret = BIO_new(BIO_s_accept());
|
---|
| 549 | if (ret == NULL)
|
---|
| 550 | return (NULL);
|
---|
| 551 | if (BIO_set_accept_name(ret, str))
|
---|
| 552 | return (ret);
|
---|
| 553 | BIO_free(ret);
|
---|
| 554 | return (NULL);
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 | #endif
|
---|