725 lines
18 KiB
C
725 lines
18 KiB
C
/*
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* Dropbear - a SSH2 server
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE. */
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#include "includes.h"
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#include "runopts.h"
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#include "signkey.h"
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#include "buffer.h"
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#include "dbutil.h"
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#include "algo.h"
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#include "tcpfwd.h"
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#include "list.h"
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cli_runopts cli_opts; /* GLOBAL */
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static void printhelp();
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static void parse_hostname(const char* orighostarg);
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static void parse_multihop_hostname(const char* orighostarg, const char* argv0);
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static void fill_own_user();
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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static void loadidentityfile(const char* filename);
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#endif
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#ifdef ENABLE_CLI_ANYTCPFWD
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static void addforward(const char* str, m_list *fwdlist);
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#endif
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#ifdef ENABLE_CLI_NETCAT
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static void add_netcat(const char *str);
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#endif
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static void printhelp() {
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fprintf(stderr, "Dropbear client v%s\n"
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#ifdef ENABLE_CLI_MULTIHOP
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"Usage: %s [options] [user@]host[/port][,[user@]host/port],...] [command]\n"
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#else
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"Usage: %s [options] [user@]host[/port] [command]\n"
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#endif
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"Options are:\n"
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"-p <remoteport>\n"
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"-l <username>\n"
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"-t Allocate a pty\n"
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"-T Don't allocate a pty\n"
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"-N Don't run a remote command\n"
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"-f Run in background after auth\n"
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"-y Always accept remote host key if unknown\n"
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"-s Request a subsystem (use for sftp)\n"
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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"-i <identityfile> (multiple allowed)\n"
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#endif
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#ifdef ENABLE_CLI_AGENTFWD
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"-A Enable agent auth forwarding\n"
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#endif
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#ifdef ENABLE_CLI_LOCALTCPFWD
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"-L <[listenaddress:]listenport:remotehost:remoteport> Local port forwarding\n"
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"-g Allow remote hosts to connect to forwarded ports\n"
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#endif
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#ifdef ENABLE_CLI_REMOTETCPFWD
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"-R <[listenaddress:]listenport:remotehost:remoteport> Remote port forwarding\n"
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#endif
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"-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n"
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"-K <keepalive> (0 is never, default %d)\n"
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"-I <idle_timeout> (0 is never, default %d)\n"
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#ifdef ENABLE_CLI_NETCAT
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"-B <endhost:endport> Netcat-alike forwarding\n"
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#endif
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#ifdef ENABLE_CLI_PROXYCMD
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"-J <proxy_program> Use program pipe rather than TCP connection\n"
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#endif
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#ifdef DEBUG_TRACE
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"-v verbose (compiled with DEBUG_TRACE)\n"
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#endif
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,DROPBEAR_VERSION, cli_opts.progname,
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DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT);
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}
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void cli_getopts(int argc, char ** argv) {
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unsigned int i, j;
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char ** next = 0;
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unsigned int cmdlen;
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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int nextiskey = 0; /* A flag if the next argument is a keyfile */
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#endif
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#ifdef ENABLE_CLI_LOCALTCPFWD
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int nextislocal = 0;
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#endif
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#ifdef ENABLE_CLI_REMOTETCPFWD
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int nextisremote = 0;
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#endif
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#ifdef ENABLE_CLI_NETCAT
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int nextisnetcat = 0;
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#endif
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char* dummy = NULL; /* Not used for anything real */
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char* recv_window_arg = NULL;
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char* keepalive_arg = NULL;
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char* idle_timeout_arg = NULL;
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char *host_arg = NULL;
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/* see printhelp() for options */
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cli_opts.progname = argv[0];
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cli_opts.remotehost = NULL;
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cli_opts.remoteport = NULL;
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cli_opts.username = NULL;
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cli_opts.cmd = NULL;
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cli_opts.no_cmd = 0;
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cli_opts.backgrounded = 0;
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cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */
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cli_opts.always_accept_key = 0;
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cli_opts.is_subsystem = 0;
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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cli_opts.privkeys = list_new();
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#endif
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#ifdef ENABLE_CLI_LOCALTCPFWD
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cli_opts.localfwds = list_new();
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opts.listen_fwd_all = 0;
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#endif
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#ifdef ENABLE_CLI_REMOTETCPFWD
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cli_opts.remotefwds = list_new();
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#endif
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#ifdef ENABLE_CLI_AGENTFWD
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cli_opts.agent_fwd = 0;
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cli_opts.agent_keys_loaded = 0;
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#endif
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#ifdef ENABLE_CLI_PROXYCMD
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cli_opts.proxycmd = NULL;
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#endif
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#ifndef DISABLE_ZLIB
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opts.enable_compress = 1;
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#endif
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/* not yet
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opts.ipv4 = 1;
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opts.ipv6 = 1;
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*/
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opts.recv_window = DEFAULT_RECV_WINDOW;
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fill_own_user();
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/* Iterate all the arguments */
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for (i = 1; i < (unsigned int)argc; i++) {
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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if (nextiskey) {
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/* Load a hostkey since the previous argument was "-i" */
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loadidentityfile(argv[i]);
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nextiskey = 0;
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continue;
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}
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#endif
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#ifdef ENABLE_CLI_REMOTETCPFWD
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if (nextisremote) {
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TRACE(("nextisremote true"))
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addforward(argv[i], cli_opts.remotefwds);
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nextisremote = 0;
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continue;
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}
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#endif
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#ifdef ENABLE_CLI_LOCALTCPFWD
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if (nextislocal) {
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TRACE(("nextislocal true"))
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addforward(argv[i], cli_opts.localfwds);
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nextislocal = 0;
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continue;
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}
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#endif
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#ifdef ENABLE_CLI_NETCAT
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if (nextisnetcat) {
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TRACE(("nextisnetcat true"))
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add_netcat(argv[i]);
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nextisnetcat = 0;
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continue;
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}
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#endif
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if (next) {
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/* The previous flag set a value to assign */
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*next = argv[i];
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if (*next == NULL) {
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dropbear_exit("Invalid null argument");
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}
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next = NULL;
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continue;
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}
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if (argv[i][0] == '-') {
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/* A flag *waves* */
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switch (argv[i][1]) {
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case 'y': /* always accept the remote hostkey */
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cli_opts.always_accept_key = 1;
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break;
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case 'p': /* remoteport */
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next = &cli_opts.remoteport;
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break;
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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case 'i': /* an identityfile */
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/* Keep scp happy when it changes "-i file" to "-ifile" */
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if (strlen(argv[i]) > 2) {
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loadidentityfile(&argv[i][2]);
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} else {
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nextiskey = 1;
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}
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break;
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#endif
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case 't': /* we want a pty */
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cli_opts.wantpty = 1;
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break;
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case 'T': /* don't want a pty */
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cli_opts.wantpty = 0;
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break;
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case 'N':
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cli_opts.no_cmd = 1;
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break;
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case 'f':
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cli_opts.backgrounded = 1;
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break;
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case 's':
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cli_opts.is_subsystem = 1;
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break;
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#ifdef ENABLE_CLI_LOCALTCPFWD
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case 'L':
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nextislocal = 1;
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break;
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case 'g':
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opts.listen_fwd_all = 1;
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break;
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#endif
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#ifdef ENABLE_CLI_REMOTETCPFWD
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case 'R':
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nextisremote = 1;
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break;
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#endif
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#ifdef ENABLE_CLI_NETCAT
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case 'B':
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nextisnetcat = 1;
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break;
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#endif
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#ifdef ENABLE_CLI_PROXYCMD
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case 'J':
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next = &cli_opts.proxycmd;
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break;
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#endif
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case 'l':
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next = &cli_opts.username;
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break;
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case 'h':
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printhelp();
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exit(EXIT_SUCCESS);
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break;
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case 'u':
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/* backwards compatibility with old urandom option */
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break;
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case 'W':
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next = &recv_window_arg;
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break;
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case 'K':
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next = &keepalive_arg;
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break;
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case 'I':
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next = &idle_timeout_arg;
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break;
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#ifdef ENABLE_CLI_AGENTFWD
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case 'A':
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cli_opts.agent_fwd = 1;
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break;
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#endif
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#ifdef DEBUG_TRACE
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case 'v':
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debug_trace = 1;
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break;
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#endif
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case 'F':
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case 'e':
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case 'c':
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case 'm':
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case 'D':
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#ifndef ENABLE_CLI_REMOTETCPFWD
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case 'R':
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#endif
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#ifndef ENABLE_CLI_LOCALTCPFWD
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case 'L':
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#endif
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case 'o':
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case 'b':
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next = &dummy;
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default:
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fprintf(stderr,
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"WARNING: Ignoring unknown argument '%s'\n", argv[i]);
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break;
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} /* Switch */
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/* Now we handle args where they might be "-luser" (no spaces)*/
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if (next && strlen(argv[i]) > 2) {
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*next = &argv[i][2];
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next = NULL;
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}
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continue; /* next argument */
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} else {
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TRACE(("non-flag arg: '%s'", argv[i]))
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/* Either the hostname or commands */
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if (host_arg == NULL) {
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host_arg = argv[i];
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} else {
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/* this is part of the commands to send - after this we
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* don't parse any more options, and flags are sent as the
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* command */
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cmdlen = 0;
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for (j = i; j < (unsigned int)argc; j++) {
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cmdlen += strlen(argv[j]) + 1; /* +1 for spaces */
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}
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/* Allocate the space */
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cli_opts.cmd = (char*)m_malloc(cmdlen);
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cli_opts.cmd[0] = '\0';
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/* Append all the bits */
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for (j = i; j < (unsigned int)argc; j++) {
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strlcat(cli_opts.cmd, argv[j], cmdlen);
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strlcat(cli_opts.cmd, " ", cmdlen);
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}
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/* It'll be null-terminated here */
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/* We've eaten all the options and flags */
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break;
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}
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}
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}
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/* And now a few sanity checks and setup */
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if (host_arg == NULL) {
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printhelp();
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exit(EXIT_FAILURE);
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}
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if (cli_opts.remoteport == NULL) {
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cli_opts.remoteport = "22";
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}
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/* If not explicitly specified with -t or -T, we don't want a pty if
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* there's a command, but we do otherwise */
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if (cli_opts.wantpty == 9) {
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if (cli_opts.cmd == NULL) {
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cli_opts.wantpty = 1;
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} else {
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cli_opts.wantpty = 0;
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}
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}
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if (cli_opts.backgrounded && cli_opts.cmd == NULL
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&& cli_opts.no_cmd == 0) {
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dropbear_exit("Command required for -f");
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}
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if (recv_window_arg) {
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opts.recv_window = atol(recv_window_arg);
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if (opts.recv_window == 0 || opts.recv_window > MAX_RECV_WINDOW) {
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dropbear_exit("Bad recv window '%s'", recv_window_arg);
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}
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}
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if (keepalive_arg) {
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unsigned int val;
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if (m_str_to_uint(keepalive_arg, &val) == DROPBEAR_FAILURE) {
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dropbear_exit("Bad keepalive '%s'", keepalive_arg);
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}
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opts.keepalive_secs = val;
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}
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if (idle_timeout_arg) {
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unsigned int val;
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if (m_str_to_uint(idle_timeout_arg, &val) == DROPBEAR_FAILURE) {
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dropbear_exit("Bad idle_timeout '%s'", idle_timeout_arg);
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}
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opts.idle_timeout_secs = val;
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}
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#ifdef ENABLE_CLI_NETCAT
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if (cli_opts.cmd && cli_opts.netcat_host) {
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dropbear_log(LOG_INFO, "Ignoring command '%s' in netcat mode", cli_opts.cmd);
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}
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#endif
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/* The hostname gets set up last, since
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* in multi-hop mode it will require knowledge
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* of other flags such as -i */
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#ifdef ENABLE_CLI_MULTIHOP
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parse_multihop_hostname(host_arg, argv[0]);
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#else
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parse_hostname(host_arg);
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#endif
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}
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#ifdef ENABLE_CLI_PUBKEY_AUTH
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static void loadidentityfile(const char* filename) {
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sign_key *key;
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int keytype;
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key = new_sign_key();
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keytype = DROPBEAR_SIGNKEY_ANY;
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if ( readhostkey(filename, key, &keytype) != DROPBEAR_SUCCESS ) {
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fprintf(stderr, "Failed loading keyfile '%s'\n", filename);
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sign_key_free(key);
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} else {
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key->type = keytype;
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key->source = SIGNKEY_SOURCE_RAW_FILE;
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key->filename = m_strdup(filename);
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list_append(cli_opts.privkeys, key);
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}
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}
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#endif
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#ifdef ENABLE_CLI_MULTIHOP
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static char*
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multihop_passthrough_args() {
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char *ret;
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int total;
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unsigned int len = 0;
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m_list_elem *iter;
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/* Fill out -i and -W options that make sense for all
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* the intermediate processes */
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for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
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{
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sign_key * key = (sign_key*)iter->item;
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len += 3 + strlen(key->filename);
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}
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len += 20; // space for -W <size>, terminator.
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ret = m_malloc(len);
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total = 0;
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if (opts.recv_window != DEFAULT_RECV_WINDOW)
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{
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int written = snprintf(ret+total, len-total, "-W %d", opts.recv_window);
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total += written;
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}
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for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
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{
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sign_key * key = (sign_key*)iter->item;
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const size_t size = len - total;
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int written = snprintf(ret+total, size, "-i %s", key->filename);
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dropbear_assert((unsigned int)written < size);
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total += written;
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}
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return ret;
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}
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/* Sets up 'onion-forwarding' connections. This will spawn
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* a separate dbclient process for each hop.
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* As an example, if the cmdline is
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* dbclient wrt,madako,canyons
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* then we want to run:
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* dbclient -J "dbclient -B canyons:22 wrt,madako" canyons
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* and then the inner dbclient will recursively run:
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* dbclient -J "dbclient -B madako:22 wrt" madako
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* etc for as many hosts as we want.
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*
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* Ports for hosts can be specified as host/port.
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*/
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static void parse_multihop_hostname(const char* orighostarg, const char* argv0) {
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char *userhostarg = NULL;
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char *hostbuf = NULL;
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char *last_hop = NULL;
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char *remainder = NULL;
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/* both scp and rsync parse a user@host argument
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* and turn it into "-l user host". This breaks
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* for our multihop syntax, so we suture it back together.
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* This will break usernames that have both '@' and ',' in them,
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* though that should be fairly uncommon. */
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if (cli_opts.username
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&& strchr(cli_opts.username, ',')
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&& strchr(cli_opts.username, '@')) {
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unsigned int len = strlen(orighostarg) + strlen(cli_opts.username) + 2;
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hostbuf = m_malloc(len);
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snprintf(hostbuf, len, "%s@%s", cli_opts.username, orighostarg);
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} else {
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hostbuf = m_strdup(orighostarg);
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}
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userhostarg = hostbuf;
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last_hop = strrchr(userhostarg, ',');
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if (last_hop) {
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if (last_hop == userhostarg) {
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dropbear_exit("Bad multi-hop hostnames");
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}
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*last_hop = '\0';
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last_hop++;
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remainder = userhostarg;
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userhostarg = last_hop;
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}
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parse_hostname(userhostarg);
|
|
|
|
if (last_hop) {
|
|
/* Set up the proxycmd */
|
|
unsigned int cmd_len = 0;
|
|
char *passthrough_args = multihop_passthrough_args();
|
|
if (cli_opts.proxycmd) {
|
|
dropbear_exit("-J can't be used with multihop mode");
|
|
}
|
|
if (cli_opts.remoteport == NULL) {
|
|
cli_opts.remoteport = "22";
|
|
}
|
|
cmd_len = strlen(argv0) + strlen(remainder)
|
|
+ strlen(cli_opts.remotehost) + strlen(cli_opts.remoteport)
|
|
+ strlen(passthrough_args)
|
|
+ 30;
|
|
cli_opts.proxycmd = m_malloc(cmd_len);
|
|
snprintf(cli_opts.proxycmd, cmd_len, "%s -B %s:%s %s %s",
|
|
argv0, cli_opts.remotehost, cli_opts.remoteport,
|
|
passthrough_args, remainder);
|
|
#ifndef DISABLE_ZLIB
|
|
/* The stream will be incompressible since it's encrypted. */
|
|
opts.enable_compress = 0;
|
|
#endif
|
|
m_free(passthrough_args);
|
|
}
|
|
m_free(hostbuf);
|
|
}
|
|
#endif /* !ENABLE_CLI_MULTIHOP */
|
|
|
|
/* Parses a [user@]hostname[/port] argument. */
|
|
static void parse_hostname(const char* orighostarg) {
|
|
char *userhostarg = NULL;
|
|
char *port = NULL;
|
|
|
|
userhostarg = m_strdup(orighostarg);
|
|
|
|
cli_opts.remotehost = strchr(userhostarg, '@');
|
|
if (cli_opts.remotehost == NULL) {
|
|
/* no username portion, the cli-auth.c code can figure the
|
|
* local user's name */
|
|
cli_opts.remotehost = userhostarg;
|
|
} else {
|
|
cli_opts.remotehost[0] = '\0'; /* Split the user/host */
|
|
cli_opts.remotehost++;
|
|
cli_opts.username = userhostarg;
|
|
}
|
|
|
|
if (cli_opts.username == NULL) {
|
|
cli_opts.username = m_strdup(cli_opts.own_user);
|
|
}
|
|
|
|
port = strchr(cli_opts.remotehost, '/');
|
|
if (port) {
|
|
*port = '\0';
|
|
cli_opts.remoteport = port+1;
|
|
}
|
|
|
|
if (cli_opts.remotehost[0] == '\0') {
|
|
dropbear_exit("Bad hostname");
|
|
}
|
|
}
|
|
|
|
#ifdef ENABLE_CLI_NETCAT
|
|
static void add_netcat(const char* origstr) {
|
|
char *portstr = NULL;
|
|
|
|
char * str = m_strdup(origstr);
|
|
|
|
portstr = strchr(str, ':');
|
|
if (portstr == NULL) {
|
|
TRACE(("No netcat port"))
|
|
goto fail;
|
|
}
|
|
*portstr = '\0';
|
|
portstr++;
|
|
|
|
if (strchr(portstr, ':')) {
|
|
TRACE(("Multiple netcat colons"))
|
|
goto fail;
|
|
}
|
|
|
|
if (m_str_to_uint(portstr, &cli_opts.netcat_port) == DROPBEAR_FAILURE) {
|
|
TRACE(("bad netcat port"))
|
|
goto fail;
|
|
}
|
|
|
|
if (cli_opts.netcat_port > 65535) {
|
|
TRACE(("too large netcat port"))
|
|
goto fail;
|
|
}
|
|
|
|
cli_opts.netcat_host = str;
|
|
return;
|
|
|
|
fail:
|
|
dropbear_exit("Bad netcat endpoint '%s'", origstr);
|
|
}
|
|
#endif
|
|
|
|
static void fill_own_user() {
|
|
uid_t uid;
|
|
struct passwd *pw = NULL;
|
|
|
|
uid = getuid();
|
|
|
|
pw = getpwuid(uid);
|
|
if (pw == NULL || pw->pw_name == NULL) {
|
|
dropbear_exit("Unknown own user");
|
|
}
|
|
|
|
cli_opts.own_user = m_strdup(pw->pw_name);
|
|
}
|
|
|
|
#ifdef ENABLE_CLI_ANYTCPFWD
|
|
/* Turn a "[listenaddr:]listenport:remoteaddr:remoteport" string into into a forwarding
|
|
* set, and add it to the forwarding list */
|
|
static void addforward(const char* origstr, m_list *fwdlist) {
|
|
|
|
char *part1 = NULL, *part2 = NULL, *part3 = NULL, *part4 = NULL;
|
|
char * listenaddr = NULL;
|
|
char * listenport = NULL;
|
|
char * connectaddr = NULL;
|
|
char * connectport = NULL;
|
|
struct TCPFwdEntry* newfwd = NULL;
|
|
char * str = NULL;
|
|
|
|
TRACE(("enter addforward"))
|
|
|
|
/* We need to split the original argument up. This var
|
|
is never free()d. */
|
|
str = m_strdup(origstr);
|
|
|
|
part1 = str;
|
|
|
|
part2 = strchr(str, ':');
|
|
if (part2 == NULL) {
|
|
TRACE(("part2 == NULL"))
|
|
goto fail;
|
|
}
|
|
*part2 = '\0';
|
|
part2++;
|
|
|
|
part3 = strchr(part2, ':');
|
|
if (part3 == NULL) {
|
|
TRACE(("part3 == NULL"))
|
|
goto fail;
|
|
}
|
|
*part3 = '\0';
|
|
part3++;
|
|
|
|
part4 = strchr(part3, ':');
|
|
if (part4) {
|
|
*part4 = '\0';
|
|
part4++;
|
|
}
|
|
|
|
if (part4) {
|
|
listenaddr = part1;
|
|
listenport = part2;
|
|
connectaddr = part3;
|
|
connectport = part4;
|
|
} else {
|
|
listenaddr = NULL;
|
|
listenport = part1;
|
|
connectaddr = part2;
|
|
connectport = part3;
|
|
}
|
|
|
|
newfwd = m_malloc(sizeof(struct TCPFwdEntry));
|
|
|
|
/* Now we check the ports - note that the port ints are unsigned,
|
|
* the check later only checks for >= MAX_PORT */
|
|
if (m_str_to_uint(listenport, &newfwd->listenport) == DROPBEAR_FAILURE) {
|
|
TRACE(("bad listenport strtoul"))
|
|
goto fail;
|
|
}
|
|
|
|
if (m_str_to_uint(connectport, &newfwd->connectport) == DROPBEAR_FAILURE) {
|
|
TRACE(("bad connectport strtoul"))
|
|
goto fail;
|
|
}
|
|
|
|
newfwd->listenaddr = listenaddr;
|
|
newfwd->connectaddr = connectaddr;
|
|
|
|
if (newfwd->listenport > 65535) {
|
|
TRACE(("listenport > 65535"))
|
|
goto badport;
|
|
}
|
|
|
|
if (newfwd->connectport > 65535) {
|
|
TRACE(("connectport > 65535"))
|
|
goto badport;
|
|
}
|
|
|
|
newfwd->have_reply = 0;
|
|
list_append(fwdlist, newfwd);
|
|
|
|
TRACE(("leave addforward: done"))
|
|
return;
|
|
|
|
fail:
|
|
dropbear_exit("Bad TCP forward '%s'", origstr);
|
|
|
|
badport:
|
|
dropbear_exit("Bad TCP port in '%s'", origstr);
|
|
}
|
|
#endif
|