Mercurial > dropbear
view tcp-accept.c @ 1653:76189c9ffea2
External Public-Key Authentication API (#72)
* Implemented dynamic loading of an external plug-in shared library to delegate public key authentication
* Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled
* Added tags file to the ignore list
* Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them
* Added -rdynamic to the linker flags when EPKA is enabled
* Changed the API to pass a previously created session to the checkPubKey function (created during preauth)
* Added documentation to the API
* Added parameter addrstring to plugin creation function
* Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session)
* Changed option string to be a simple char * instead of unsigned char *
author | fabriziobertocci <fabriziobertocci@gmail.com> |
---|---|
date | Wed, 15 May 2019 09:43:57 -0400 |
parents | 572a7aefa188 |
children | 1d86a58fb52d |
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/* * Dropbear SSH * * Copyright (c) 2002,2003 Matt Johnston * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "includes.h" #include "ssh.h" #include "tcpfwd.h" #include "dbutil.h" #include "session.h" #include "buffer.h" #include "packet.h" #include "listener.h" #include "listener.h" #include "runopts.h" #if DROPBEAR_TCP_ACCEPT static void cleanup_tcp(const struct Listener *listener) { struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata); m_free(tcpinfo->sendaddr); m_free(tcpinfo->listenaddr); m_free(tcpinfo->request_listenaddr); m_free(tcpinfo); } int tcp_prio_inithandler(struct Channel* channel) { TRACE(("tcp_prio_inithandler channel %d", channel->index)) channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE; return 0; } static void tcp_acceptor(const struct Listener *listener, int sock) { int fd; struct sockaddr_storage sa; socklen_t len; char ipstring[NI_MAXHOST], portstring[NI_MAXSERV]; struct TCPListener *tcpinfo = (struct TCPListener*)(listener->typedata); len = sizeof(sa); fd = accept(sock, (struct sockaddr*)&sa, &len); if (fd < 0) { return; } if (getnameinfo((struct sockaddr*)&sa, len, ipstring, sizeof(ipstring), portstring, sizeof(portstring), NI_NUMERICHOST | NI_NUMERICSERV) != 0) { m_close(fd); return; } if (send_msg_channel_open_init(fd, tcpinfo->chantype) == DROPBEAR_SUCCESS) { char* addr = NULL; unsigned int port = 0; if (tcpinfo->tcp_type == direct) { /* "direct-tcpip" */ /* host to connect, port to connect */ addr = tcpinfo->sendaddr; port = tcpinfo->sendport; } else { dropbear_assert(tcpinfo->tcp_type == forwarded); /* "forwarded-tcpip" */ /* address that was connected, port that was connected */ addr = tcpinfo->request_listenaddr; port = tcpinfo->listenport; } if (addr == NULL) { addr = "localhost"; } buf_putstring(ses.writepayload, addr, strlen(addr)); buf_putint(ses.writepayload, port); /* originator ip */ buf_putstring(ses.writepayload, ipstring, strlen(ipstring)); /* originator port */ buf_putint(ses.writepayload, atol(portstring)); encrypt_packet(); } else { /* XXX debug? */ close(fd); } } int listen_tcpfwd(struct TCPListener* tcpinfo, struct Listener **ret_listener) { char portstring[NI_MAXSERV]; int socks[DROPBEAR_MAX_SOCKS]; int nsocks; struct Listener *listener; char* errstring = NULL; TRACE(("enter listen_tcpfwd")) /* first we try to bind, so don't need to do so much cleanup on failure */ snprintf(portstring, sizeof(portstring), "%u", tcpinfo->listenport); nsocks = dropbear_listen(tcpinfo->listenaddr, portstring, socks, DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd); if (nsocks < 0) { dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring); m_free(errstring); TRACE(("leave listen_tcpfwd: dropbear_listen failed")) return DROPBEAR_FAILURE; } m_free(errstring); /* new_listener will close the socks if it fails */ listener = new_listener(socks, nsocks, CHANNEL_ID_TCPFORWARDED, tcpinfo, tcp_acceptor, cleanup_tcp); if (listener == NULL) { TRACE(("leave listen_tcpfwd: listener failed")) return DROPBEAR_FAILURE; } if (ret_listener) { *ret_listener = listener; } TRACE(("leave listen_tcpfwd: success")) return DROPBEAR_SUCCESS; } #endif /* DROPBEAR_TCP_ACCEPT */