/
bss_dgram.c
1929 lines (1743 loc) · 56.6 KB
/
bss_dgram.c
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/*
* Copyright 2005-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <stdio.h>
#include <errno.h>
#include "bio_local.h"
#ifndef OPENSSL_NO_DGRAM
# ifndef OPENSSL_NO_SCTP
# include <netinet/sctp.h>
# include <fcntl.h>
# define OPENSSL_SCTP_DATA_CHUNK_TYPE 0x00
# define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
# endif
# if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
# define IP_MTU 14 /* linux is lame */
# endif
# if OPENSSL_USE_IPV6 && !defined(IPPROTO_IPV6)
# define IPPROTO_IPV6 41 /* windows is lame */
# endif
# if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
/* Standard definition causes type-punning problems. */
# undef IN6_IS_ADDR_V4MAPPED
# define s6_addr32 __u6_addr.__u6_addr32
# define IN6_IS_ADDR_V4MAPPED(a) \
(((a)->s6_addr32[0] == 0) && \
((a)->s6_addr32[1] == 0) && \
((a)->s6_addr32[2] == htonl(0x0000ffff)))
# endif
static int dgram_write(BIO *h, const char *buf, int num);
static int dgram_read(BIO *h, char *buf, int size);
static int dgram_puts(BIO *h, const char *str);
static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int dgram_new(BIO *h);
static int dgram_free(BIO *data);
static int dgram_clear(BIO *bio);
# ifndef OPENSSL_NO_SCTP
static int dgram_sctp_write(BIO *h, const char *buf, int num);
static int dgram_sctp_read(BIO *h, char *buf, int size);
static int dgram_sctp_puts(BIO *h, const char *str);
static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int dgram_sctp_new(BIO *h);
static int dgram_sctp_free(BIO *data);
# ifdef SCTP_AUTHENTICATION_EVENT
static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification
*snp);
# endif
# endif
static int BIO_dgram_should_retry(int s);
static void get_current_time(struct timeval *t);
static const BIO_METHOD methods_dgramp = {
BIO_TYPE_DGRAM,
"datagram socket",
/* TODO: Convert to new style write function */
bwrite_conv,
dgram_write,
/* TODO: Convert to new style read function */
bread_conv,
dgram_read,
dgram_puts,
NULL, /* dgram_gets, */
dgram_ctrl,
dgram_new,
dgram_free,
NULL, /* dgram_callback_ctrl */
};
# ifndef OPENSSL_NO_SCTP
static const BIO_METHOD methods_dgramp_sctp = {
BIO_TYPE_DGRAM_SCTP,
"datagram sctp socket",
/* TODO: Convert to new style write function */
bwrite_conv,
dgram_sctp_write,
/* TODO: Convert to new style write function */
bread_conv,
dgram_sctp_read,
dgram_sctp_puts,
NULL, /* dgram_gets, */
dgram_sctp_ctrl,
dgram_sctp_new,
dgram_sctp_free,
NULL, /* dgram_callback_ctrl */
};
# endif
typedef struct bio_dgram_data_st {
BIO_ADDR peer;
unsigned int connected;
unsigned int _errno;
unsigned int mtu;
struct timeval next_timeout;
struct timeval socket_timeout;
unsigned int peekmode;
} bio_dgram_data;
# ifndef OPENSSL_NO_SCTP
typedef struct bio_dgram_sctp_save_message_st {
BIO *bio;
char *data;
int length;
} bio_dgram_sctp_save_message;
typedef struct bio_dgram_sctp_data_st {
BIO_ADDR peer;
unsigned int connected;
unsigned int _errno;
unsigned int mtu;
struct bio_dgram_sctp_sndinfo sndinfo;
struct bio_dgram_sctp_rcvinfo rcvinfo;
struct bio_dgram_sctp_prinfo prinfo;
void (*handle_notifications) (BIO *bio, void *context, void *buf);
void *notification_context;
int in_handshake;
int ccs_rcvd;
int ccs_sent;
int save_shutdown;
int peer_auth_tested;
} bio_dgram_sctp_data;
# endif
const BIO_METHOD *BIO_s_datagram(void)
{
return &methods_dgramp;
}
BIO *BIO_new_dgram(int fd, int close_flag)
{
BIO *ret;
ret = BIO_new(BIO_s_datagram());
if (ret == NULL)
return NULL;
BIO_set_fd(ret, fd, close_flag);
return ret;
}
static int dgram_new(BIO *bi)
{
bio_dgram_data *data = OPENSSL_zalloc(sizeof(*data));
if (data == NULL)
return 0;
bi->ptr = data;
return 1;
}
static int dgram_free(BIO *a)
{
bio_dgram_data *data;
if (a == NULL)
return 0;
if (!dgram_clear(a))
return 0;
data = (bio_dgram_data *)a->ptr;
OPENSSL_free(data);
return 1;
}
static int dgram_clear(BIO *a)
{
if (a == NULL)
return 0;
if (a->shutdown) {
if (a->init) {
BIO_closesocket(a->num);
}
a->init = 0;
a->flags = 0;
}
return 1;
}
static void dgram_adjust_rcv_timeout(BIO *b)
{
# if defined(SO_RCVTIMEO)
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
union {
size_t s;
int i;
} sz = {
0
};
/* Is a timer active? */
if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
struct timeval timenow, timeleft;
/* Read current socket timeout */
# ifdef OPENSSL_SYS_WINDOWS
int timeout;
sz.i = sizeof(timeout);
if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
(void *)&timeout, &sz.i) < 0) {
perror("getsockopt");
} else {
data->socket_timeout.tv_sec = timeout / 1000;
data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
}
# else
sz.i = sizeof(data->socket_timeout);
if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
&(data->socket_timeout), (void *)&sz) < 0) {
perror("getsockopt");
} else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0)
OPENSSL_assert(sz.s <= sizeof(data->socket_timeout));
# endif
/* Get current time */
get_current_time(&timenow);
/* Calculate time left until timer expires */
memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
if (timeleft.tv_usec < timenow.tv_usec) {
timeleft.tv_usec = 1000000 - timenow.tv_usec + timeleft.tv_usec;
timeleft.tv_sec--;
} else {
timeleft.tv_usec -= timenow.tv_usec;
}
if (timeleft.tv_sec < timenow.tv_sec) {
timeleft.tv_sec = 0;
timeleft.tv_usec = 1;
} else {
timeleft.tv_sec -= timenow.tv_sec;
}
/*
* Adjust socket timeout if next handshake message timer will expire
* earlier.
*/
if ((data->socket_timeout.tv_sec == 0
&& data->socket_timeout.tv_usec == 0)
|| (data->socket_timeout.tv_sec > timeleft.tv_sec)
|| (data->socket_timeout.tv_sec == timeleft.tv_sec
&& data->socket_timeout.tv_usec >= timeleft.tv_usec)) {
# ifdef OPENSSL_SYS_WINDOWS
timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
(void *)&timeout, sizeof(timeout)) < 0) {
perror("setsockopt");
}
# else
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
sizeof(struct timeval)) < 0) {
perror("setsockopt");
}
# endif
}
}
# endif
}
static void dgram_reset_rcv_timeout(BIO *b)
{
# if defined(SO_RCVTIMEO)
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
/* Is a timer active? */
if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
# ifdef OPENSSL_SYS_WINDOWS
int timeout = data->socket_timeout.tv_sec * 1000 +
data->socket_timeout.tv_usec / 1000;
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
(void *)&timeout, sizeof(timeout)) < 0) {
perror("setsockopt");
}
# else
if (setsockopt
(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
sizeof(struct timeval)) < 0) {
perror("setsockopt");
}
# endif
}
# endif
}
static int dgram_read(BIO *b, char *out, int outl)
{
int ret = 0;
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
int flags = 0;
BIO_ADDR peer;
socklen_t len = sizeof(peer);
if (out != NULL) {
clear_socket_error();
memset(&peer, 0, sizeof(peer));
dgram_adjust_rcv_timeout(b);
if (data->peekmode)
flags = MSG_PEEK;
ret = recvfrom(b->num, out, outl, flags,
BIO_ADDR_sockaddr_noconst(&peer), &len);
if (!data->connected && ret >= 0)
BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &peer);
BIO_clear_retry_flags(b);
if (ret < 0) {
if (BIO_dgram_should_retry(ret)) {
BIO_set_retry_read(b);
data->_errno = get_last_socket_error();
}
}
dgram_reset_rcv_timeout(b);
}
return ret;
}
static int dgram_write(BIO *b, const char *in, int inl)
{
int ret;
bio_dgram_data *data = (bio_dgram_data *)b->ptr;
clear_socket_error();
if (data->connected)
ret = writesocket(b->num, in, inl);
else {
int peerlen = BIO_ADDR_sockaddr_size(&data->peer);
ret = sendto(b->num, in, inl, 0,
BIO_ADDR_sockaddr(&data->peer), peerlen);
}
BIO_clear_retry_flags(b);
if (ret <= 0) {
if (BIO_dgram_should_retry(ret)) {
BIO_set_retry_write(b);
data->_errno = get_last_socket_error();
}
}
return ret;
}
static long dgram_get_mtu_overhead(bio_dgram_data *data)
{
long ret;
switch (BIO_ADDR_family(&data->peer)) {
case AF_INET:
/*
* Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
*/
ret = 28;
break;
# if OPENSSL_USE_IPV6
case AF_INET6:
{
# ifdef IN6_IS_ADDR_V4MAPPED
struct in6_addr tmp_addr;
if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
&& IN6_IS_ADDR_V4MAPPED(&tmp_addr))
/*
* Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
*/
ret = 28;
else
# endif
/*
* Assume this is UDP - 40 bytes for IP, 8 bytes for UDP
*/
ret = 48;
}
break;
# endif
default:
/* We don't know. Go with the historical default */
ret = 28;
break;
}
return ret;
}
static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 1;
int *ip;
bio_dgram_data *data = NULL;
int sockopt_val = 0;
int d_errno;
# if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
socklen_t sockopt_len; /* assume that system supporting IP_MTU is
* modern enough to define socklen_t */
socklen_t addr_len;
BIO_ADDR addr;
# endif
data = (bio_dgram_data *)b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
num = 0;
ret = 0;
break;
case BIO_CTRL_INFO:
ret = 0;
break;
case BIO_C_SET_FD:
dgram_clear(b);
b->num = *((int *)ptr);
b->shutdown = (int)num;
b->init = 1;
break;
case BIO_C_GET_FD:
if (b->init) {
ip = (int *)ptr;
if (ip != NULL)
*ip = b->num;
ret = b->num;
} else
ret = -1;
break;
case BIO_CTRL_GET_CLOSE:
ret = b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_PENDING:
case BIO_CTRL_WPENDING:
ret = 0;
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_DGRAM_CONNECT:
BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
break;
/* (Linux)kernel sets DF bit on outgoing IP packets */
case BIO_CTRL_DGRAM_MTU_DISCOVER:
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
addr_len = (socklen_t) sizeof(addr);
memset(&addr, 0, sizeof(addr));
if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
ret = 0;
break;
}
switch (addr.sa.sa_family) {
case AF_INET:
sockopt_val = IP_PMTUDISC_DO;
if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0)
perror("setsockopt");
break;
# if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
case AF_INET6:
sockopt_val = IPV6_PMTUDISC_DO;
if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0)
perror("setsockopt");
break;
# endif
default:
ret = -1;
break;
}
# else
ret = -1;
# endif
break;
case BIO_CTRL_DGRAM_QUERY_MTU:
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
addr_len = (socklen_t) sizeof(addr);
memset(&addr, 0, sizeof(addr));
if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
ret = 0;
break;
}
sockopt_len = sizeof(sockopt_val);
switch (addr.sa.sa_family) {
case AF_INET:
if ((ret =
getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
&sockopt_len)) < 0 || sockopt_val < 0) {
ret = 0;
} else {
/*
* we assume that the transport protocol is UDP and no IP
* options are used.
*/
data->mtu = sockopt_val - 8 - 20;
ret = data->mtu;
}
break;
# if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
case AF_INET6:
if ((ret =
getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
(void *)&sockopt_val, &sockopt_len)) < 0
|| sockopt_val < 0) {
ret = 0;
} else {
/*
* we assume that the transport protocol is UDP and no IPV6
* options are used.
*/
data->mtu = sockopt_val - 8 - 40;
ret = data->mtu;
}
break;
# endif
default:
ret = 0;
break;
}
# else
ret = 0;
# endif
break;
case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
ret = -dgram_get_mtu_overhead(data);
switch (BIO_ADDR_family(&data->peer)) {
case AF_INET:
ret += 576;
break;
# if OPENSSL_USE_IPV6
case AF_INET6:
{
# ifdef IN6_IS_ADDR_V4MAPPED
struct in6_addr tmp_addr;
if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
&& IN6_IS_ADDR_V4MAPPED(&tmp_addr))
ret += 576;
else
# endif
ret += 1280;
}
break;
# endif
default:
ret += 576;
break;
}
break;
case BIO_CTRL_DGRAM_GET_MTU:
return data->mtu;
case BIO_CTRL_DGRAM_SET_MTU:
data->mtu = num;
ret = num;
break;
case BIO_CTRL_DGRAM_SET_CONNECTED:
if (ptr != NULL) {
data->connected = 1;
BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
} else {
data->connected = 0;
memset(&data->peer, 0, sizeof(data->peer));
}
break;
case BIO_CTRL_DGRAM_GET_PEER:
ret = BIO_ADDR_sockaddr_size(&data->peer);
/* FIXME: if num < ret, we will only return part of an address.
That should bee an error, no? */
if (num == 0 || num > ret)
num = ret;
memcpy(ptr, &data->peer, (ret = num));
break;
case BIO_CTRL_DGRAM_SET_PEER:
BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
break;
case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
break;
# if defined(SO_RCVTIMEO)
case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
# ifdef OPENSSL_SYS_WINDOWS
{
struct timeval *tv = (struct timeval *)ptr;
int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
(void *)&timeout, sizeof(timeout)) < 0) {
perror("setsockopt");
ret = -1;
}
}
# else
if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
sizeof(struct timeval)) < 0) {
perror("setsockopt");
ret = -1;
}
# endif
break;
case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
{
union {
size_t s;
int i;
} sz = {
0
};
# ifdef OPENSSL_SYS_WINDOWS
int timeout;
struct timeval *tv = (struct timeval *)ptr;
sz.i = sizeof(timeout);
if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
(void *)&timeout, &sz.i) < 0) {
perror("getsockopt");
ret = -1;
} else {
tv->tv_sec = timeout / 1000;
tv->tv_usec = (timeout % 1000) * 1000;
ret = sizeof(*tv);
}
# else
sz.i = sizeof(struct timeval);
if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
ptr, (void *)&sz) < 0) {
perror("getsockopt");
ret = -1;
} else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
OPENSSL_assert(sz.s <= sizeof(struct timeval));
ret = (int)sz.s;
} else
ret = sz.i;
# endif
}
break;
# endif
# if defined(SO_SNDTIMEO)
case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
# ifdef OPENSSL_SYS_WINDOWS
{
struct timeval *tv = (struct timeval *)ptr;
int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
(void *)&timeout, sizeof(timeout)) < 0) {
perror("setsockopt");
ret = -1;
}
}
# else
if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
sizeof(struct timeval)) < 0) {
perror("setsockopt");
ret = -1;
}
# endif
break;
case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
{
union {
size_t s;
int i;
} sz = {
0
};
# ifdef OPENSSL_SYS_WINDOWS
int timeout;
struct timeval *tv = (struct timeval *)ptr;
sz.i = sizeof(timeout);
if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
(void *)&timeout, &sz.i) < 0) {
perror("getsockopt");
ret = -1;
} else {
tv->tv_sec = timeout / 1000;
tv->tv_usec = (timeout % 1000) * 1000;
ret = sizeof(*tv);
}
# else
sz.i = sizeof(struct timeval);
if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
ptr, (void *)&sz) < 0) {
perror("getsockopt");
ret = -1;
} else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
OPENSSL_assert(sz.s <= sizeof(struct timeval));
ret = (int)sz.s;
} else
ret = sz.i;
# endif
}
break;
# endif
case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
/* fall-through */
case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
# ifdef OPENSSL_SYS_WINDOWS
d_errno = (data->_errno == WSAETIMEDOUT);
# else
d_errno = (data->_errno == EAGAIN);
# endif
if (d_errno) {
ret = 1;
data->_errno = 0;
} else
ret = 0;
break;
# ifdef EMSGSIZE
case BIO_CTRL_DGRAM_MTU_EXCEEDED:
if (data->_errno == EMSGSIZE) {
ret = 1;
data->_errno = 0;
} else
ret = 0;
break;
# endif
case BIO_CTRL_DGRAM_SET_DONT_FRAG:
sockopt_val = num ? 1 : 0;
switch (data->peer.sa.sa_family) {
case AF_INET:
# if defined(IP_DONTFRAG)
if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
&sockopt_val, sizeof(sockopt_val))) < 0) {
perror("setsockopt");
ret = -1;
}
# elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined (IP_PMTUDISC_PROBE)
if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
(ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0) {
perror("setsockopt");
ret = -1;
}
# elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
(const char *)&sockopt_val,
sizeof(sockopt_val))) < 0) {
perror("setsockopt");
ret = -1;
}
# else
ret = -1;
# endif
break;
# if OPENSSL_USE_IPV6
case AF_INET6:
# if defined(IPV6_DONTFRAG)
if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
(const void *)&sockopt_val,
sizeof(sockopt_val))) < 0) {
perror("setsockopt");
ret = -1;
}
# elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
(ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0) {
perror("setsockopt");
ret = -1;
}
# else
ret = -1;
# endif
break;
# endif
default:
ret = -1;
break;
}
break;
case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
ret = dgram_get_mtu_overhead(data);
break;
/*
* BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE is used here for compatibility
* reasons. When BIO_CTRL_DGRAM_SET_PEEK_MODE was first defined its value
* was incorrectly clashing with BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE. The
* value has been updated to a non-clashing value. However to preserve
* binary compatibility we now respond to both the old value and the new one
*/
case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
case BIO_CTRL_DGRAM_SET_PEEK_MODE:
data->peekmode = (unsigned int)num;
break;
default:
ret = 0;
break;
}
return ret;
}
static int dgram_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = dgram_write(bp, str, n);
return ret;
}
# ifndef OPENSSL_NO_SCTP
const BIO_METHOD *BIO_s_datagram_sctp(void)
{
return &methods_dgramp_sctp;
}
BIO *BIO_new_dgram_sctp(int fd, int close_flag)
{
BIO *bio;
int ret, optval = 20000;
int auth_data = 0, auth_forward = 0;
unsigned char *p;
struct sctp_authchunk auth;
struct sctp_authchunks *authchunks;
socklen_t sockopt_len;
# ifdef SCTP_AUTHENTICATION_EVENT
# ifdef SCTP_EVENT
struct sctp_event event;
# else
struct sctp_event_subscribe event;
# endif
# endif
bio = BIO_new(BIO_s_datagram_sctp());
if (bio == NULL)
return NULL;
BIO_set_fd(bio, fd, close_flag);
/* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
ret =
setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
sizeof(struct sctp_authchunk));
if (ret < 0) {
BIO_vfree(bio);
BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
return NULL;
}
auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
ret =
setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
sizeof(struct sctp_authchunk));
if (ret < 0) {
BIO_vfree(bio);
BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
return NULL;
}
/*
* Test if activation was successful. When using accept(), SCTP-AUTH has
* to be activated for the listening socket already, otherwise the
* connected socket won't use it. Similarly with connect(): the socket
* prior to connection must be activated for SCTP-AUTH
*/
sockopt_len = (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
authchunks = OPENSSL_zalloc(sockopt_len);
if (authchunks == NULL) {
BIO_vfree(bio);
return NULL;
}
ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks,
&sockopt_len);
if (ret < 0) {
OPENSSL_free(authchunks);
BIO_vfree(bio);
return NULL;
}
for (p = (unsigned char *)authchunks->gauth_chunks;
p < (unsigned char *)authchunks + sockopt_len;
p += sizeof(uint8_t)) {
if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
auth_data = 1;
if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
auth_forward = 1;
}
OPENSSL_free(authchunks);
if (!auth_data || !auth_forward) {
BIO_vfree(bio);
BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
ERR_add_error_data(1,
"Ensure SCTP AUTH chunks are enabled on the "
"underlying socket");
return NULL;
}
# ifdef SCTP_AUTHENTICATION_EVENT
# ifdef SCTP_EVENT
memset(&event, 0, sizeof(event));
event.se_assoc_id = 0;
event.se_type = SCTP_AUTHENTICATION_EVENT;
event.se_on = 1;
ret =
setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event,
sizeof(struct sctp_event));
if (ret < 0) {
BIO_vfree(bio);
return NULL;
}
# else
sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
if (ret < 0) {
BIO_vfree(bio);
return NULL;
}
event.sctp_authentication_event = 1;
ret =
setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
sizeof(struct sctp_event_subscribe));
if (ret < 0) {
BIO_vfree(bio);
return NULL;
}
# endif
# endif
/*
* Disable partial delivery by setting the min size larger than the max
* record size of 2^14 + 2048 + 13
*/
ret =
setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
sizeof(optval));
if (ret < 0) {
BIO_vfree(bio);
return NULL;
}
return bio;
}
int BIO_dgram_is_sctp(BIO *bio)
{
return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
}
static int dgram_sctp_new(BIO *bi)
{
bio_dgram_sctp_data *data = NULL;
bi->init = 0;
bi->num = 0;
if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL) {
BIOerr(BIO_F_DGRAM_SCTP_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
# ifdef SCTP_PR_SCTP_NONE
data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
# endif
bi->ptr = data;
bi->flags = 0;
return 1;
}
static int dgram_sctp_free(BIO *a)
{
bio_dgram_sctp_data *data;
if (a == NULL)
return 0;
if (!dgram_clear(a))
return 0;
data = (bio_dgram_sctp_data *) a->ptr;
if (data != NULL)
OPENSSL_free(data);
return 1;
}
# ifdef SCTP_AUTHENTICATION_EVENT
void dgram_sctp_handle_auth_free_key_event(BIO *b,
union sctp_notification *snp)
{
int ret;
struct sctp_authkey_event *authkeyevent = &snp->sn_auth_event;
if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY) {
struct sctp_authkeyid authkeyid;