diff --git a/src/assuan-socket.c b/src/assuan-socket.c
index 6b9f6ca..2b148d1 100644
--- a/src/assuan-socket.c
+++ b/src/assuan-socket.c
@@ -1,1654 +1,1654 @@
/* assuan-socket.c - Socket wrapper
* Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
* Copyright (C) 2001-2015 g10 Code GmbH
*
* This file is part of Assuan.
*
* Assuan is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Assuan is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_W32_SYSTEM
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# include <wincrypt.h>
# include <io.h>
#else
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
#endif
#include <errno.h>
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <assert.h>
#include "assuan-defs.h"
#include "debug.h"
/* Hacks for Slowaris. */
#ifndef PF_LOCAL
# ifdef PF_UNIX
# define PF_LOCAL PF_UNIX
# else
# define PF_LOCAL AF_UNIX
# endif
#endif
#ifndef AF_LOCAL
# define AF_LOCAL AF_UNIX
#endif
#ifdef HAVE_W32_SYSTEM
#ifndef S_IRUSR
# define S_IRUSR 0
# define S_IWUSR 0
#endif
#ifndef S_IRGRP
# define S_IRGRP 0
# define S_IWGRP 0
#endif
#ifndef ENOTSUP
#define ENOTSUP 129
#endif
#ifndef EPROTO
#define EPROTO 134
#endif
#ifndef EPROTONOSUPPORT
#define EPROTONOSUPPORT 135
#endif
#ifndef ENETDOWN
#define ENETDOWN 116
#endif
#ifndef ENETUNREACH
#define ENETUNREACH 118
#endif
#ifndef EHOSTUNREACH
#define EHOSTUNREACH 110
#endif
#ifndef ECONNREFUSED
#define ECONNREFUSED 107
#endif
#ifndef ETIMEDOUT
#define ETIMEDOUT 138
#endif
#endif
#ifndef ENAMETOOLONG
# define ENAMETOOLONG EINVAL
#endif
#ifndef SUN_LEN
# define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+ strlen ((ptr)->sun_path))
#endif
#ifndef INADDR_LOOPBACK
# define INADDR_LOOPBACK ((in_addr_t) 0x7f000001) /* 127.0.0.1. */
#endif
/* The standard SOCKS and TOR port. */
#define SOCKS_PORT 1080
#define TOR_PORT 9050
#define TOR_PORT2 9150 /* The Tor browser is listening there. */
/* In the future, we can allow access to sock_ctx, if that context's
hook functions need to be overridden. There can only be one global
assuan_sock_* user (one library or one application) with this
convenience interface, if non-standard hook functions are
needed. */
static assuan_context_t sock_ctx;
/* This global flag can be set using assuan_sock_set_flag to enable
TOR or SOCKS mode for all sockets. It may not be reset. The value
is the port to be used. */
static unsigned short tor_mode;
#ifdef HAVE_W32_SYSTEM
/* A table of active Cygwin connections. This is only used for
listening socket which should be only a few. We do not enter
sockets after a connect into this table. */
static assuan_fd_t cygwin_fdtable[16];
/* A critical section to guard access to the table of Cygwin
connections. */
static CRITICAL_SECTION cygwin_fdtable_cs;
/* Return true if SOCKFD is listed as Cygwin socket. */
static int
is_cygwin_fd (assuan_fd_t sockfd)
{
int ret = 0;
int i;
EnterCriticalSection (&cygwin_fdtable_cs);
for (i=0; i < DIM(cygwin_fdtable); i++)
{
if (cygwin_fdtable[i] == sockfd)
{
ret = 1;
break;
}
}
LeaveCriticalSection (&cygwin_fdtable_cs);
return ret;
}
/* Insert SOCKFD into the table of Cygwin sockets. Return 0 on
success or -1 on error. */
static int
insert_cygwin_fd (assuan_fd_t sockfd)
{
int ret = 0;
int mark = -1;
int i;
EnterCriticalSection (&cygwin_fdtable_cs);
for (i=0; i < DIM(cygwin_fdtable); i++)
{
if (cygwin_fdtable[i] == sockfd)
goto leave; /* Already in table. */
else if (cygwin_fdtable[i] == ASSUAN_INVALID_FD)
mark = i;
}
if (mark == -1)
{
gpg_err_set_errno (EMFILE);
ret = -1;
}
else
cygwin_fdtable[mark] = sockfd;
leave:
LeaveCriticalSection (&cygwin_fdtable_cs);
return ret;
}
/* Delete SOCKFD from the table of Cygwin sockets. */
static void
delete_cygwin_fd (assuan_fd_t sockfd)
{
int i;
EnterCriticalSection (&cygwin_fdtable_cs);
for (i=0; i < DIM(cygwin_fdtable); i++)
{
if (cygwin_fdtable[i] == sockfd)
{
cygwin_fdtable[i] = ASSUAN_INVALID_FD;
break;
}
}
LeaveCriticalSection (&cygwin_fdtable_cs);
return;
}
wchar_t *
_assuan_utf8_to_wchar (const char *string)
{
int n;
size_t nbytes;
wchar_t *result;
if (!string)
return NULL;
n = MultiByteToWideChar (CP_UTF8, 0, string, -1, NULL, 0);
if (n < 0)
return NULL;
nbytes = (size_t)(n+1) * sizeof(*result);
if (nbytes / sizeof(*result) != (n+1))
{
SetLastError (ERROR_INVALID_PARAMETER);
return NULL;
}
result = malloc (nbytes);
if (!result)
return NULL;
n = MultiByteToWideChar (CP_UTF8, 0, string, -1, result, n);
if (n < 0)
{
n = GetLastError ();
free (result);
result = NULL;
SetLastError (n);
}
return result;
}
static HANDLE
MyCreateFile (LPCSTR lpFileName, DWORD dwDesiredAccess, DWORD dwSharedMode,
LPSECURITY_ATTRIBUTES lpSecurityAttributes,
DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes,
HANDLE hTemplateFile)
{
wchar_t *filename;
HANDLE result;
int err;
filename = _assuan_utf8_to_wchar (lpFileName);
if (!filename)
return INVALID_HANDLE_VALUE;
result = CreateFileW (filename, dwDesiredAccess, dwSharedMode,
lpSecurityAttributes, dwCreationDisposition,
dwFlagsAndAttributes, hTemplateFile);
err = GetLastError ();
free (filename);
SetLastError (err);
return result;
}
static int
MyDeleteFile (LPCSTR lpFileName)
{
wchar_t *filename;
int result, err;
filename = _assuan_utf8_to_wchar (lpFileName);
if (!filename)
return 0;
result = DeleteFileW (filename);
err = GetLastError ();
free (filename);
SetLastError (err);
return result;
}
int
_assuan_sock_wsa2errno (int err)
{
switch (err)
{
case WSAENOTSOCK:
return EINVAL;
case WSAEWOULDBLOCK:
return EAGAIN;
case ERROR_BROKEN_PIPE:
return EPIPE;
case WSANOTINITIALISED:
return ENOSYS;
case WSAECONNREFUSED:
return ECONNREFUSED;
default:
return EIO;
}
}
/* W32: Fill BUFFER with LENGTH bytes of random. Returns -1 on
failure, 0 on success. Sets errno on failure. */
static int
get_nonce (char *buffer, size_t nbytes)
{
HCRYPTPROV prov;
int ret = -1;
if (!CryptAcquireContext (&prov, NULL, NULL, PROV_RSA_FULL,
(CRYPT_VERIFYCONTEXT|CRYPT_SILENT)) )
gpg_err_set_errno (ENODEV);
else
{
if (!CryptGenRandom (prov, nbytes, (unsigned char *) buffer))
gpg_err_set_errno (ENODEV);
else
ret = 0;
CryptReleaseContext (prov, 0);
}
return ret;
}
/* W32: The buffer for NONCE needs to be at least 16 bytes. Returns 0
on success and sets errno on failure. If FNAME has a Cygwin socket
descriptor True is stored at CYGWIN. */
static int
read_port_and_nonce (const char *fname, unsigned short *port, char *nonce,
int *cygwin)
{
estream_t fp;
char buffer[50], *p;
size_t nread;
int aval;
*cygwin = 0;
fp = gpgrt_fopen (fname, "rb");
if (!fp)
return -1;
nread = gpgrt_fread (buffer, 1, sizeof buffer - 1, fp);
gpgrt_fclose (fp);
if (!nread)
{
gpg_err_set_errno (ENOENT);
return -1;
}
buffer[nread] = 0;
if (!strncmp (buffer, "!<socket >", 10))
{
/* This is the Cygwin compatible socket emulation. The format
* of the file is:
*
* "!<socket >%u %c %08x-%08x-%08x-%08x\x00"
*
* %u for port number, %c for kind of socket (s for STREAM), and
* we have 16-byte random bytes for nonce. We only support
* stream mode.
*/
unsigned int u0;
int narr[4];
if (sscanf (buffer+10, "%u s %08x-%08x-%08x-%08x",
&u0, narr+0, narr+1, narr+2, narr+3) != 5
|| u0 < 1 || u0 > 65535)
{
gpg_err_set_errno (EINVAL);
return -1;
}
*port = u0;
memcpy (nonce, narr, 16);
*cygwin = 1;
}
else
{
/* This is our own socket emulation. */
aval = atoi (buffer);
if (aval < 1 || aval > 65535)
{
gpg_err_set_errno (EINVAL);
return -1;
}
*port = (unsigned int)aval;
for (p=buffer; nread && *p != '\n'; p++, nread--)
;
if (*p != '\n' || nread != 17)
{
gpg_err_set_errno (EINVAL);
return -1;
}
p++; nread--;
memcpy (nonce, p, 16);
}
return 0;
}
#endif /*HAVE_W32_SYSTEM*/
#ifndef HAVE_W32_SYSTEM
/* Find a redirected socket name for fname and return a malloced setup
filled sockaddr. If this does not work out NULL is returned and
ERRNO is set. If the file seems to be a redirect True is stored at
R_REDIRECT. Note that this function uses the standard malloc and
not the assuan wrapped one. The format of the file is:
%Assuan%
socket=NAME
where NAME is the actual socket to use. No white spaces are
allowed, both lines must be terminated by a single LF, extra lines
are not allowed. Environment variables are interpreted in NAME if
given in "${VAR} notation; no escape characters are defined, if
"${" shall be used verbatim, you need to use an environment
variable with that content.
The use of an absolute NAME is strongly suggested. The length of
the file is limited to 511 bytes which is more than sufficient for
that common value of 107 for sun_path. */
static struct sockaddr_un *
eval_redirection (const char *fname, int *r_redirect)
{
FILE *fp;
char buffer[512], *name;
size_t n;
struct sockaddr_un *addr;
char *p, *pend;
const char *s;
*r_redirect = 0;
fp = fopen (fname, "rb");
if (!fp)
return NULL;
n = fread (buffer, 1, sizeof buffer - 1, fp);
fclose (fp);
if (!n)
{
gpg_err_set_errno (ENOENT);
return NULL;
}
buffer[n] = 0;
/* Check that it is a redirection file. We also check that the
first byte of the name is not a LF because that would lead to an
zero length name. */
if (n < 17 || buffer[n-1] != '\n'
|| memcmp (buffer, "%Assuan%\nsocket=", 16)
|| buffer[16] == '\n')
{
gpg_err_set_errno (EINVAL);
return NULL;
}
buffer[n-1] = 0;
name = buffer + 16;
*r_redirect = 1;
addr = calloc (1, sizeof *addr);
if (!addr)
return NULL;
addr->sun_family = AF_LOCAL;
n = 0;
for (p=name; *p; p++)
{
if (*p == '$' && p[1] == '{')
{
p += 2;
pend = strchr (p, '}');
if (!pend)
{
free (addr);
gpg_err_set_errno (EINVAL);
return NULL;
}
*pend = 0;
if (*p && (s = getenv (p)))
{
for (; *s; s++)
{
if (n < sizeof addr->sun_path - 1)
addr->sun_path[n++] = *s;
else
{
free (addr);
gpg_err_set_errno (ENAMETOOLONG);
return NULL;
}
}
}
p = pend;
}
else if (*p == '\n')
break; /* Be nice and stop at the first LF. */
else if (n < sizeof addr->sun_path - 1)
addr->sun_path[n++] = *p;
else
{
free (addr);
gpg_err_set_errno (ENAMETOOLONG);
return NULL;
}
}
return addr;
}
#endif /*!HAVE_W32_SYSTEM*/
/* Return a new socket. Note that under W32 we consider a socket the
same as an System Handle; all functions using such a handle know
about this dual use and act accordingly. */
assuan_fd_t
_assuan_sock_new (assuan_context_t ctx, int domain, int type, int proto)
{
#ifdef HAVE_W32_SYSTEM
assuan_fd_t res;
if (domain == AF_UNIX || domain == AF_LOCAL)
domain = AF_INET;
res = _assuan_socket (ctx, domain, type, proto);
return res;
#else
return _assuan_socket (ctx, domain, type, proto);
#endif
}
int
_assuan_sock_set_flag (assuan_context_t ctx, assuan_fd_t sockfd,
const char *name, int value)
{
(void)ctx;
if (!strcmp (name, "cygwin"))
{
#ifdef HAVE_W32_SYSTEM
if (!value)
delete_cygwin_fd (sockfd);
else if (insert_cygwin_fd (sockfd))
return -1;
#else
/* Setting the Cygwin flag on non-Windows is ignored. */
#endif
}
else if (!strcmp (name, "tor-mode") || !strcmp (name, "socks"))
{
/* If SOCKFD is ASSUAN_INVALID_FD this controls global flag to
switch AF_INET and AF_INET6 into TOR mode by using a SOCKS5
proxy on localhost:9050. It may only be switched on and this
needs to be done before any new threads are started. Once
TOR mode has been enabled, TOR mode can be disabled for a
specific socket by using SOCKFD with a VALUE of 0. */
if (sockfd == ASSUAN_INVALID_FD)
{
if (tor_mode && !value)
{
gpg_err_set_errno (EPERM);
return -1; /* Clearing the global flag is not allowed. */
}
else if (value)
{
if (*name == 's')
tor_mode = SOCKS_PORT;
else
tor_mode = TOR_PORT;
}
}
else if (tor_mode && sockfd != ASSUAN_INVALID_FD)
{
/* Fixme: Disable/enable tormode for the given context. */
}
else
{
gpg_err_set_errno (EINVAL);
return -1;
}
}
else if (!strcmp (name, "linger"))
{
struct linger li = { 0 };
if (value >= 0)
{
li.l_onoff = 1;
li.l_linger = value;
}
if (setsockopt (HANDLE2SOCKET(sockfd), SOL_SOCKET, SO_LINGER,
(void *)&li, sizeof li))
return -1;
}
else if (!strcmp (name, "reuseaddr"))
{
int i = !!value;
if (setsockopt (HANDLE2SOCKET(sockfd), SOL_SOCKET, SO_REUSEADDR,
(void *)&i, sizeof (i)))
return -1;
}
else
{
gpg_err_set_errno (EINVAL);
return -1;
}
return 0;
}
int
_assuan_sock_get_flag (assuan_context_t ctx, assuan_fd_t sockfd,
const char *name, int *r_value)
{
(void)ctx;
if (!strcmp (name, "cygwin"))
{
#ifdef HAVE_W32_SYSTEM
*r_value = is_cygwin_fd (sockfd);
#else
*r_value = 0;
#endif
}
else if (!strcmp (name, "tor-mode"))
{
/* FIXME: Find tor-mode for the given socket. */
*r_value = tor_mode == TOR_PORT;
}
else if (!strcmp (name, "socks"))
{
*r_value = tor_mode == SOCKS_PORT;
}
else if (!strcmp (name, "linger"))
{
struct linger li = { 0 };
socklen_t lilen = sizeof li;
if (getsockopt (HANDLE2SOCKET(sockfd), SOL_SOCKET, SO_LINGER,
(void *)&li, &lilen))
return -1;
else if (lilen < sizeof li)
{
gpg_err_set_errno (EINVAL);
return -1;
}
if (li.l_onoff && li.l_linger >= 0)
*r_value = li.l_linger;
else
*r_value = -1;
}
else if (!strcmp (name, "reuseaddr"))
{
int i = 0;
socklen_t ilen = sizeof i;
if (getsockopt (HANDLE2SOCKET(sockfd), SOL_SOCKET, SO_REUSEADDR,
(void *)&i, &ilen))
return -1;
else if (ilen < sizeof i)
{
gpg_err_set_errno (EINVAL);
return -1;
}
*r_value = !!i;
}
else
{
gpg_err_set_errno (EINVAL);
return -1;
}
return 0;
}
/* Read NBYTES from SOCKFD into BUFFER. Return 0 on success. Handle
EAGAIN and EINTR. */
static int
do_readn (assuan_context_t ctx, assuan_fd_t sockfd,
void *buffer, size_t nbytes)
{
char *p = buffer;
ssize_t n;
while (nbytes)
{
n = _assuan_read (ctx, sockfd, p, nbytes);
if (n < 0 && errno == EINTR)
;
else if (n < 0 && errno == EAGAIN)
_assuan_usleep (ctx, 100000); /* 100ms */
else if (n < 0)
return -1;
else if (!n)
{
gpg_err_set_errno (EIO);
return -1;
}
else
{
p += n;
nbytes -= n;
}
}
return 0;
}
/* Write NBYTES from BUFFER to SOCKFD. Return 0 on success; on error
return -1 and set ERRNO. */
static int
do_writen (assuan_context_t ctx, assuan_fd_t sockfd,
const void *buffer, size_t nbytes)
{
int ret;
ret = _assuan_write (ctx, sockfd, buffer, nbytes);
if (ret >= 0 && ret != nbytes)
{
gpg_err_set_errno (EIO);
ret = -1;
}
else if (ret >= 0)
ret = 0;
return ret;
}
#define TIMEOUT_NOT_WAITING_SOCKS5_FOREVER 1 /* in second(s) */
/* Connect using the SOCKS5 protocol. */
static int
socks5_connect (assuan_context_t ctx, assuan_fd_t sock,
unsigned short socksport,
const char *credentials,
const char *hostname, unsigned short hostport,
struct sockaddr *addr, socklen_t length,
int timeout)
{
int ret;
/* struct sockaddr_in6 proxyaddr_in6; */
struct sockaddr_in proxyaddr_in;
struct sockaddr *proxyaddr;
size_t proxyaddrlen;
union {
struct sockaddr *addr;
struct sockaddr_in *addr_in;
struct sockaddr_in6 *addr_in6;
} addru;
unsigned char buffer[22+512]; /* The extra 512 gives enough space
for username/password or the
hostname. */
size_t buflen, hostnamelen;
int method;
fd_set fds;
struct timeval tv = { TIMEOUT_NOT_WAITING_SOCKS5_FOREVER, 0 };
addru.addr = addr;
FD_ZERO (&fds);
FD_SET (HANDLE2SOCKET (sock), &fds);
/* memset (&proxyaddr_in6, 0, sizeof proxyaddr_in6); */
memset (&proxyaddr_in, 0, sizeof proxyaddr_in);
/* Either HOSTNAME or ADDR may be given. */
if (hostname && addr)
{
gpg_err_set_errno (EINVAL);
return -1;
}
/* If a hostname is given it must fit into our buffer and it must be
less than 256 so that its length can be encoded in one byte. */
hostnamelen = hostname? strlen (hostname) : 0;
if (hostnamelen > 255)
{
gpg_err_set_errno (ENAMETOOLONG);
return -1;
}
/* Connect to local host. */
/* Fixme: First try to use IPv6 but note that
_assuan_sock_connect_byname created the socket with AF_INET. */
proxyaddr_in.sin_family = AF_INET;
proxyaddr_in.sin_port = htons (socksport);
proxyaddr_in.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
proxyaddr = (struct sockaddr *)&proxyaddr_in;
proxyaddrlen = sizeof proxyaddr_in;
ret = _assuan_connect (ctx, sock, proxyaddr, proxyaddrlen);
if (ret && socksport == TOR_PORT && errno == ECONNREFUSED)
{
/* Standard Tor port failed - try the Tor browser port. */
proxyaddr_in.sin_port = htons (TOR_PORT2);
ret = _assuan_connect (ctx, sock, proxyaddr, proxyaddrlen);
}
if (ret)
return ret;
buffer[0] = 5; /* RFC-1928 VER field. */
buffer[1] = 1; /* NMETHODS */
if (credentials)
method = 2; /* Method: username/password authentication. */
else
method = 0; /* Method: No authentication required. */
buffer[2] = method;
/* Negotiate method. */
ret = do_writen (ctx, sock, buffer, 3);
if (ret)
return ret;
/* There may be a different service at the port, which doesn't
respond. Not to be bothred by such a service. */
/* FIXME: Since the process may block on select, it should be
npth_select to release thread scheduling if nPth is enabled.
Ideally, select is better to be in the system hooks. However, it
is considered OK to use select directly; Normal use case is three
steps: detect SOCKS5 service before nPth use, configure nPth
system hooks, and then use socks5_connect. For the first call,
select indeed blocks, but it's only single thread. For
succeeding calls, this select should soon return successfully.
*/
ret = select (HANDLE2SOCKET (sock)+1, &fds, NULL, NULL, &tv);
if (ret < 0)
return ret;
else if (!ret)
{
gpg_err_set_errno (ETIMEDOUT);
return -1;
}
ret = do_readn (ctx, sock, buffer, 2);
if (ret)
return ret;
if (buffer[0] != 5 || buffer[1] != method )
{
/* Socks server returned wrong version or does not support our
requested method. */
gpg_err_set_errno (ENOTSUP); /* Fixme: Is there a better errno? */
return -1;
}
if (credentials)
{
const char *password;
int ulen, plen;
password = strchr (credentials, ':');
if (!password)
{
gpg_err_set_errno (EINVAL); /* No password given. */
return -1;
}
ulen = password - credentials;
password++;
plen = strlen (password);
if (!ulen || ulen > 255 || !plen || plen > 255)
{
gpg_err_set_errno (EINVAL);
return -1;
}
buffer[0] = 1; /* VER of the sub-negotiation. */
buffer[1] = ulen;
buflen = 2;
memcpy (buffer+buflen, credentials, ulen);
buflen += ulen;
buffer[buflen++] = plen;
memcpy (buffer+buflen, password, plen);
buflen += plen;
ret = do_writen (ctx, sock, buffer, buflen);
wipememory (buffer, buflen);
if (ret)
return ret;
ret = do_readn (ctx, sock, buffer, 2);
if (ret)
return ret;
if (buffer[0] != 1)
{
/* SOCKS server returned wrong version. */
gpg_err_set_errno (EPROTONOSUPPORT);
return -1;
}
if (buffer[1])
{
/* SOCKS server denied access. */
gpg_err_set_errno (EACCES);
return -1;
}
}
if (hostname && !*hostname && !hostport)
{
/* Empty hostname given. Stop right here to allow the caller to
do the actual proxy request. */
return 0;
}
/* Send request details (rfc-1928, 4). */
buffer[0] = 5; /* VER */
buffer[1] = 1; /* CMD = CONNECT */
buffer[2] = 0; /* RSV */
if (hostname)
{
buffer[3] = 3; /* ATYP = DOMAINNAME */
buflen = 4;
buffer[buflen++] = hostnamelen;
memcpy (buffer+buflen, hostname, hostnamelen);
buflen += hostnamelen;
buffer[buflen++] = (hostport >> 8); /* DST.PORT */
buffer[buflen++] = hostport;
}
else if (addr->sa_family == AF_INET6)
{
buffer[3] = 4; /* ATYP = IPv6 */
memcpy (buffer+ 4, &addru.addr_in6->sin6_addr.s6_addr, 16); /* DST.ADDR */
memcpy (buffer+20, &addru.addr_in6->sin6_port, 2); /* DST.PORT */
buflen = 22;
}
else
{
buffer[3] = 1; /* ATYP = IPv4 */
memcpy (buffer+4, &addru.addr_in->sin_addr.s_addr, 4); /* DST.ADDR */
memcpy (buffer+8, &addru.addr_in->sin_port, 2); /* DST.PORT */
buflen = 10;
}
ret = do_writen (ctx, sock, buffer, buflen);
if (ret)
return ret;
if (timeout != 0)
{
if (timeout == -1)
{
tv.tv_sec = 0;
tv.tv_usec = 0;
}
else
{
/* TIMEOUT is in milisecond */
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
}
ret = select (HANDLE2SOCKET (sock)+1, &fds, NULL, NULL, &tv);
if (ret < 0)
return ret;
if (!ret)
{
gpg_err_set_errno (ETIMEDOUT);
return -1;
}
}
ret = do_readn (ctx, sock, buffer, 10 /* Length for IPv4 */);
if (ret)
return ret;
if (buffer[0] != 5 || buffer[2] != 0 )
{
/* Socks server returned wrong version or the reserved field is
not zero. */
gpg_err_set_errno (EPROTONOSUPPORT);
return -1;
}
if (buffer[1])
{
switch (buffer[1])
{
case 0x01: /* General SOCKS server failure. */
gpg_err_set_errno (ENETDOWN);
break;
case 0x02: /* Connection not allowed by ruleset. */
gpg_err_set_errno (EACCES);
break;
case 0x03: /* Network unreachable */
gpg_err_set_errno (ENETUNREACH);
break;
case 0x04: /* Host unreachable */
gpg_err_set_errno (EHOSTUNREACH);
break;
case 0x05: /* Connection refused */
gpg_err_set_errno (ECONNREFUSED);
break;
case 0x06: /* TTL expired */
gpg_err_set_errno (ETIMEDOUT);
break;
case 0x08: /* Address type not supported */
gpg_err_set_errno (EPROTONOSUPPORT);
break;
case 0x07: /* Command not supported */
default:
gpg_err_set_errno (ENOTSUP); /* Fixme: Is there a better errno? */
}
return -1;
}
if (buffer[3] == 4)
{
/* ATYP indicates a v6 address. We need to read the remaining
12 bytes. */
ret = do_readn (ctx, sock, buffer+10, 12);
if (ret)
return ret;
}
/* FIXME: We have not way to store the actual address used by the
server. */
return 0;
}
/* Return true if SOCKS shall be used. This is the case if tor_mode
is enabled and the desired address is not the loopback
address. */
static int
use_socks (struct sockaddr *addr)
{
union {
struct sockaddr *addr;
struct sockaddr_in *addr_in;
struct sockaddr_in6 *addr_in6;
} addru;
addru.addr = addr;
if (!tor_mode)
return 0;
else if (addr->sa_family == AF_INET6)
{
const unsigned char *s;
int i;
s = (unsigned char *)&addru.addr_in6->sin6_addr.s6_addr;
if (s[15] != 1)
return 1; /* Last octet is not 1 - not the loopback address. */
for (i=0; i < 15; i++, s++)
if (*s)
return 1; /* Non-zero octet found - not the loopback address. */
return 0; /* This is the loopback address. */
}
else if (addr->sa_family == AF_INET)
{
if (*(unsigned char*)&addru.addr_in->sin_addr.s_addr == 127)
return 0; /* Loopback (127.0.0.0/8) */
return 1;
}
else
return 0;
}
static assuan_fd_t
_assuan_sock_accept (assuan_context_t ctx, assuan_fd_t sockfd,
struct sockaddr *addr, socklen_t *p_addrlen)
{
assuan_fd_t res;
(void)ctx;
_assuan_pre_syscall ();
#ifdef HAVE_W32_SYSTEM
res = SOCKET2HANDLE (accept (HANDLE2SOCKET (sockfd), addr, p_addrlen));
if (res == SOCKET2HANDLE (INVALID_SOCKET))
gpg_err_set_errno (_assuan_sock_wsa2errno (WSAGetLastError ()));
#else
res = accept (sockfd, addr, p_addrlen);
#endif
_assuan_post_syscall ();
return res;
}
int
_assuan_sock_connect (assuan_context_t ctx, assuan_fd_t sockfd,
struct sockaddr *addr, socklen_t addrlen)
{
#ifdef HAVE_W32_SYSTEM
if (addr->sa_family == AF_LOCAL || addr->sa_family == AF_UNIX)
{
struct sockaddr_in myaddr;
struct sockaddr_un *unaddr;
unsigned short port;
char nonce[16];
int cygwin;
int ret;
unaddr = (struct sockaddr_un *)addr;
if (read_port_and_nonce (unaddr->sun_path, &port, nonce, &cygwin))
return -1;
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons (port);
myaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
/* Set return values. */
unaddr->sun_family = myaddr.sin_family;
unaddr->sun_port = myaddr.sin_port;
unaddr->sun_addr.s_addr = myaddr.sin_addr.s_addr;
ret = _assuan_connect (ctx, sockfd,
(struct sockaddr *)&myaddr, sizeof myaddr);
if (!ret)
{
/* Send the nonce. */
ret = do_writen (ctx, sockfd, nonce, 16);
if (!ret && cygwin)
{
char buffer[16];
/* The server sends the nonce back - not useful. We do
a dummy read. */
ret = do_readn (ctx, sockfd, buffer, 16);
if (!ret)
{
/* Send our credentials. */
int n = getpid ();
memcpy (buffer, &n, 4);
memset (buffer+4, 0, 4); /* uid = gid = 0 */
ret = do_writen (ctx, sockfd, buffer, 8);
if (!ret)
{
/* Receive credentials. We don't need them. */
ret = do_readn (ctx, sockfd, buffer, 8);
}
}
}
}
return ret;
}
else if (use_socks (addr))
{
return socks5_connect (ctx, sockfd, tor_mode,
NULL, NULL, 0, addr, addrlen, 0);
}
else
{
return _assuan_connect (ctx, sockfd, addr, addrlen);
}
#else
# if HAVE_STAT
if (addr->sa_family == AF_LOCAL || addr->sa_family == AF_UNIX)
{
struct sockaddr_un *unaddr;
struct stat statbuf;
int redirect, res;
unaddr = (struct sockaddr_un *)addr;
if (!stat (unaddr->sun_path, &statbuf)
&& !S_ISSOCK (statbuf.st_mode)
&& S_ISREG (statbuf.st_mode))
{
/* The given socket file is not a socket but a regular file.
We use the content of that file to redirect to another
socket file. This can be used to use sockets on file
systems which do not support sockets or if for example a
home directory is shared by several machines. */
unaddr = eval_redirection (unaddr->sun_path, &redirect);
if (unaddr)
{
res = _assuan_connect (ctx, sockfd, (struct sockaddr *)unaddr,
SUN_LEN (unaddr));
free (unaddr);
return res;
}
if (redirect)
return -1;
/* Continue using the standard connect. */
}
}
# endif /*HAVE_STAT*/
if (use_socks (addr))
{
return socks5_connect (ctx, sockfd, tor_mode,
NULL, NULL, 0, addr, addrlen, 0);
}
else
{
return _assuan_connect (ctx, sockfd, addr, addrlen);
}
#endif
}
/* Connect to HOST specified as host name on PORT. The current
implementation requires that either the flags ASSUAN_SOCK_SOCKS or
ASSUAN_SOCK_TOR are given in FLAGS. On success a new socket is
returned; on error ASSUAN_INVALID_FD is returned and ERRNO set. If
CREDENTIALS is not NULL, it is a string used for password based
authentication. Username and password are separated by a colon.
TIMEOUT specifies connection timeout in miliseconds (0 means
default timeout, -1 means immediate timeout). By passing HOST and
PORT as 0 the function can be used to check for proxy availability:
If the proxy is available a socket will be returned which the
caller should then close. */
assuan_fd_t
_assuan_sock_connect_byname (assuan_context_t ctx, const char *host,
unsigned short port, int timeout,
const char *credentials, unsigned int flags)
{
assuan_fd_t fd;
unsigned short socksport;
if ((flags & ASSUAN_SOCK_TOR))
socksport = TOR_PORT;
else if ((flags & ASSUAN_SOCK_SOCKS))
socksport = SOCKS_PORT;
else
{
gpg_err_set_errno (ENOTSUP);
return ASSUAN_INVALID_FD;
}
if (host && !*host)
{
/* Error out early on an empty host name. See below. */
gpg_err_set_errno (EINVAL);
return ASSUAN_INVALID_FD;
}
fd = _assuan_sock_new (ctx, AF_INET, SOCK_STREAM, 0);
if (fd == ASSUAN_INVALID_FD)
return fd;
/* For HOST being NULL we pass an empty string which indicates to
socks5_connect to stop midway during the proxy negotiation. Note
that we can't pass NULL directly as this indicates IP address
mode to the called function. */
if (socks5_connect (ctx, fd, socksport,
credentials, host? host:"", port, NULL, 0,
timeout))
{
int save_errno = errno;
assuan_sock_close (fd);
gpg_err_set_errno (save_errno);
return ASSUAN_INVALID_FD;
}
return fd;
}
int
_assuan_sock_bind (assuan_context_t ctx, assuan_fd_t sockfd,
struct sockaddr *addr, socklen_t addrlen)
{
int res;
#ifdef HAVE_W32_SYSTEM
if (addr->sa_family == AF_LOCAL || addr->sa_family == AF_UNIX)
{
struct sockaddr_in myaddr;
struct sockaddr_un *unaddr;
HANDLE filehd;
int len = sizeof myaddr;
int rc;
union {
char data[16];
int aint[4];
} nonce;
char tmpbuf[50+16];
DWORD nwritten;
if (get_nonce (nonce.data, 16))
{
res = -1;
goto leave;
}
unaddr = (struct sockaddr_un *)addr;
myaddr.sin_port = 0;
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
filehd = MyCreateFile (unaddr->sun_path,
GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
CREATE_NEW,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (filehd == INVALID_HANDLE_VALUE)
{
if (GetLastError () == ERROR_FILE_EXISTS)
gpg_err_set_errno (EADDRINUSE);
res = -1;
goto leave;
}
rc = bind (HANDLE2SOCKET (sockfd), (struct sockaddr *)&myaddr, len);
if (!rc)
rc = getsockname (HANDLE2SOCKET (sockfd),
(struct sockaddr *)&myaddr, &len);
if (rc)
{
- int save_e = errno;
+ int save_e = _assuan_sock_wsa2errno (WSAGetLastError ());
CloseHandle (filehd);
MyDeleteFile (unaddr->sun_path);
gpg_err_set_errno (save_e);
res = rc;
goto leave;
}
if (is_cygwin_fd (sockfd))
{
snprintf (tmpbuf, sizeof tmpbuf,
"!<socket >%d s %08x-%08x-%08x-%08x",
ntohs (myaddr.sin_port),
nonce.aint[0], nonce.aint[1], nonce.aint[2], nonce.aint[3]);
len = strlen (tmpbuf) + 1;
}
else
{
snprintf (tmpbuf, sizeof tmpbuf-16, "%d\n", ntohs (myaddr.sin_port));
len = strlen (tmpbuf);
memcpy (tmpbuf+len, nonce.data,16);
len += 16;
}
if (!WriteFile (filehd, tmpbuf, len, &nwritten, NULL))
{
CloseHandle (filehd);
MyDeleteFile (unaddr->sun_path);
gpg_err_set_errno (EIO);
res = -1;
goto leave;
}
CloseHandle (filehd);
res = 0;
}
else
{
res = bind (HANDLE2SOCKET(sockfd), addr, addrlen);
if (res < 0)
gpg_err_set_errno ( _assuan_sock_wsa2errno (WSAGetLastError ()));
}
leave:
#else
res = bind (sockfd, addr, addrlen);
#endif
return res;
}
/* Setup the ADDR structure for a Unix domain socket with the socket
name FNAME. If this is a redirected socket and R_REDIRECTED is not
NULL, it will be setup for the real socket. Returns 0 on success
and stores 1 at R_REDIRECTED if it is a redirected socket. On
error -1 is returned and ERRNO will be set. */
int
_assuan_sock_set_sockaddr_un (const char *fname, struct sockaddr *addr,
int *r_redirected)
{
struct sockaddr_un *unaddr = (struct sockaddr_un *)addr;
#if !defined(HAVE_W32_SYSTEM) && defined(HAVE_STAT)
struct stat statbuf;
#endif
if (r_redirected)
*r_redirected = 0;
#if !defined(HAVE_W32_SYSTEM) && defined(HAVE_STAT)
if (r_redirected
&& !stat (fname, &statbuf)
&& !S_ISSOCK (statbuf.st_mode)
&& S_ISREG (statbuf.st_mode))
{
/* The given socket file is not a socket but a regular file. We
use the content of that file to redirect to another socket
file. This can be used to use sockets on file systems which
do not support sockets or if for example a home directory is
shared by several machines. */
struct sockaddr_un *unaddr_new;
int redirect;
unaddr_new = eval_redirection (fname, &redirect);
if (unaddr_new)
{
memcpy (unaddr, unaddr_new, sizeof *unaddr);
free (unaddr_new);
*r_redirected = 1;
return 0;
}
if (redirect)
{
*r_redirected = 1;
return -1; /* Error. */
}
/* Fallback to standard setup. */
}
#endif /*!HAVE_W32_SYSTEM && HAVE_STAT*/
if (strlen (fname)+1 >= sizeof unaddr->sun_path)
{
gpg_err_set_errno (ENAMETOOLONG);
return -1;
}
memset (unaddr, 0, sizeof *unaddr);
unaddr->sun_family = AF_LOCAL;
strncpy (unaddr->sun_path, fname, sizeof unaddr->sun_path - 1);
unaddr->sun_path[sizeof unaddr->sun_path - 1] = 0;
return 0;
}
int
_assuan_sock_get_nonce (assuan_context_t ctx, struct sockaddr *addr,
socklen_t addrlen, assuan_sock_nonce_t *nonce)
{
#ifdef HAVE_W32_SYSTEM
if (addr->sa_family == AF_LOCAL || addr->sa_family == AF_UNIX)
{
struct sockaddr_un *unaddr;
unsigned short port;
int dummy;
if (sizeof nonce->nonce != 16)
{
gpg_err_set_errno (EINVAL);
return -1;
}
nonce->length = 16;
unaddr = (struct sockaddr_un *)addr;
if (read_port_and_nonce (unaddr->sun_path, &port, nonce->nonce, &dummy))
return -1;
}
else
{
nonce->length = 42; /* Arbitrary value to detect unitialized nonce. */
nonce->nonce[0] = 42;
}
#else
(void)addr;
(void)addrlen;
nonce->length = 0;
#endif
return 0;
}
int
_assuan_sock_check_nonce (assuan_context_t ctx, assuan_fd_t fd,
assuan_sock_nonce_t *nonce)
{
#ifdef HAVE_W32_SYSTEM
char buffer[16];
int n;
if (sizeof nonce->nonce != 16)
{
gpg_err_set_errno (EINVAL);
return -1;
}
if (nonce->length == 42 && nonce->nonce[0] == 42)
return 0; /* Not a Unix domain socket. */
if (nonce->length != 16)
{
gpg_err_set_errno (EINVAL);
return -1;
}
if (do_readn (ctx, fd, buffer, 16))
return -1;
if (memcmp (buffer, nonce->nonce, 16))
{
gpg_err_set_errno (EACCES);
return -1;
}
if (is_cygwin_fd (fd))
{
/* Send the nonce back to the client. */
if (do_writen (ctx, fd, buffer, 16))
return -1;
/* Read the credentials. Cygwin uses the
struct ucred { pid_t pid; uid_t uid; gid_t gid; };
with pid_t being an int (4 bytes) and uid_t and gid_t being
shorts (2 bytes). Thus we need to read 8 bytes. However we
we ignore the values because they are not kernel controlled. */
if (do_readn (ctx, fd, buffer, 8))
return -1;
memcpy (&ctx->process_id, buffer, 4);
/* Send our credentials: We use the uid and gid we received but
our own pid. */
n = getpid ();
memcpy (buffer, &n, 4);
if (do_writen (ctx, fd, buffer, 8))
return -1;
}
#else
(void)fd;
(void)nonce;
#endif
return 0;
}
/* Public API. */
gpg_error_t
assuan_sock_init (void)
{
gpg_error_t err;
#ifdef HAVE_W32_SYSTEM
WSADATA wsadat;
#endif
if (sock_ctx != NULL)
return 0;
#ifdef HAVE_W32_SYSTEM
InitializeCriticalSection (&cygwin_fdtable_cs);
#endif
err = assuan_new (&sock_ctx);
sock_ctx->flags.is_socket = 1;
#ifdef HAVE_W32_SYSTEM
if (! err)
WSAStartup (0x202, &wsadat);
#endif
return err;
}
void
assuan_sock_deinit (void)
{
if (sock_ctx == NULL)
return;
#ifdef HAVE_W32_SYSTEM
WSACleanup ();
#endif
assuan_release (sock_ctx);
sock_ctx = NULL;
#ifdef HAVE_W32_SYSTEM
DeleteCriticalSection (&cygwin_fdtable_cs);
#endif
}
int
assuan_sock_close (assuan_fd_t fd)
{
#ifdef HAVE_W32_SYSTEM
if (fd != ASSUAN_INVALID_FD)
delete_cygwin_fd (fd);
#endif
return _assuan_close (sock_ctx, fd);
}
assuan_fd_t
assuan_sock_new (int domain, int type, int proto)
{
return _assuan_sock_new (sock_ctx, domain, type, proto);
}
int
assuan_sock_set_flag (assuan_fd_t sockfd, const char *name, int value)
{
return _assuan_sock_set_flag (sock_ctx, sockfd, name, value);
}
int
assuan_sock_get_flag (assuan_fd_t sockfd, const char *name, int *r_value)
{
return _assuan_sock_get_flag (sock_ctx, sockfd, name, r_value);
}
assuan_fd_t
assuan_sock_accept (assuan_fd_t sockfd, struct sockaddr *addr,
socklen_t *p_addrlen)
{
return _assuan_sock_accept (sock_ctx, sockfd, addr, p_addrlen);
}
int
assuan_sock_connect (assuan_fd_t sockfd, struct sockaddr *addr,
socklen_t addrlen)
{
return _assuan_sock_connect (sock_ctx, sockfd, addr, addrlen);
}
assuan_fd_t
assuan_sock_connect_byname (const char *host, unsigned short port,
int timeout, const char *credentials,
unsigned int flags)
{
return _assuan_sock_connect_byname (sock_ctx,
host, port, timeout, credentials, flags);
}
int
assuan_sock_bind (assuan_fd_t sockfd, struct sockaddr *addr,
socklen_t addrlen)
{
return _assuan_sock_bind (sock_ctx, sockfd, addr, addrlen);
}
int
assuan_sock_set_sockaddr_un (const char *fname, struct sockaddr *addr,
int *r_redirected)
{
return _assuan_sock_set_sockaddr_un (fname, addr, r_redirected);
}
int
assuan_sock_get_nonce (struct sockaddr *addr, socklen_t addrlen,
assuan_sock_nonce_t *nonce)
{
return _assuan_sock_get_nonce (sock_ctx, addr, addrlen, nonce);
}
int
assuan_sock_check_nonce (assuan_fd_t fd, assuan_sock_nonce_t *nonce)
{
return _assuan_sock_check_nonce (sock_ctx, fd, nonce);
}
void
assuan_sock_set_system_hooks (assuan_system_hooks_t system_hooks)
{
if (sock_ctx)
_assuan_system_hooks_copy (&sock_ctx->system, system_hooks);
}