dropbear: common-session.c annotate

annotate common-session.c @ 482:7ad49f34a122

- Add run_shell_command() function to run a "sh -c" command, handling lots of the work that exechild did (and can be shared by client -J option)

author	Matt Johnston <matt@ucc.asn.au>
date	Mon, 15 Sep 2008 14:04:55 +0000
parents	e3db1f7a2e43
children	738313e73b1c

rev	line source
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * Permission is hereby granted, free of charge, to any person obtaining a copy
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * of this software and associated documentation files (the "Software"), to deal
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * in the Software without restriction, including without limitation the rights
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * copies of the Software, and to permit persons to whom the Software is
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * furnished to do so, subject to the following conditions:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * The above copyright notice and this permission notice shall be included in
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * SOFTWARE. */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "session.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "dbutil.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "packet.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "algo.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "dss.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "ssh.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #include "random.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #include "kex.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 #include "channel.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #include "atomicio.h"
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	37 #include "runopts.h"
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38
108 10f4d3319780 - added circular buffering for channels Matt Johnston <matt@ucc.asn.au> parents: 107 diff changeset	39 static void checktimeouts();
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	40 static long select_timeout();
108 10f4d3319780 - added circular buffering for channels Matt Johnston <matt@ucc.asn.au> parents: 107 diff changeset	41 static int ident_readln(int fd, char* buf, int count);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	42
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	43 struct sshsession ses; /* GLOBAL */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 /* need to know if the session struct has been initialised, this way isn't the
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 * cleanest, but works OK */
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	47 int sessinitdone = 0; /* GLOBAL */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	50 int exitflag = 0; /* GLOBAL */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	53
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 /* called only at the start of a session, set up initial state */
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	55 void common_session_init(int sock_in, int sock_out, char* remotehost) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	57 TRACE(("enter session_init"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	59 ses.remotehost = remotehost;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	61 ses.sock_in = sock_in;
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	62 ses.sock_out = sock_out;
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	63 ses.maxfd = MAX(sock_in, sock_out);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	65 ses.connect_time = 0;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	66 ses.last_packet_time = 0;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67
416 a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	68 if (pipe(ses.signal_pipe) < 0) {
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	69 dropbear_exit("signal pipe failed");
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	70 }
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	71 setnonblocking(ses.signal_pipe[0]);
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	72 setnonblocking(ses.signal_pipe[1]);
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	73
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 26 diff changeset	74 kexfirstinitialise(); /* initialise the kex state */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75
448 9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in Matt Johnston <matt@ucc.asn.au> parents: 416 diff changeset	76 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 ses.transseq = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 ses.readbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 ses.decryptreadbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 ses.payload = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 ses.recvseq = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83
135 d663445c1533 Initialise the outgoing packet queue Matt Johnston <matt@ucc.asn.au> parents: 108 diff changeset	84 initqueue(&ses.writequeue);
d663445c1533 Initialise the outgoing packet queue Matt Johnston <matt@ucc.asn.au> parents: 108 diff changeset	85
22 c1e5d9195402 merge of abac2150ee4f4031a98016241fbd136d24fed127 Matt Johnston <matt@ucc.asn.au> parents: 21 diff changeset	86 ses.requirenext = SSH_MSG_KEXINIT;
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	87 ses.dataallowed = 1; /* we can send data until we actually
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	88 send the SSH_MSG_KEXINIT */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 ses.ignorenext = 0;
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	90 ses.lastpacket = 0;
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	91 ses.reply_queue_head = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	92 ses.reply_queue_tail = NULL;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 /* set all the algos to none */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 ses.newkeys = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 ses.keys->recv_algo_crypt = &dropbear_nocipher;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 ses.keys->trans_algo_crypt = &dropbear_nocipher;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 ses.keys->recv_algo_mac = &dropbear_nohash;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 ses.keys->trans_algo_mac = &dropbear_nohash;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 ses.keys->algo_kex = -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 ses.keys->algo_hostkey = -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 ses.keys->recv_algo_comp = DROPBEAR_COMP_NONE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 ses.keys->trans_algo_comp = DROPBEAR_COMP_NONE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 #ifndef DISABLE_ZLIB
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 ses.keys->recv_zstream = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 ses.keys->trans_zstream = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 #endif
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 /* key exchange buffers */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 ses.session_id = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 ses.kexhashbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 ses.transkexinit = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 ses.dh_K = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 ses.remoteident = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119
6 ab00ef513e97 Sorted out the first channel init issues. Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	120 ses.chantypes = NULL;
ab00ef513e97 Sorted out the first channel init issues. Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	121
21 d7cc5b484a2e - Port restriction code back in Matt Johnston <matt@ucc.asn.au> parents: 6 diff changeset	122 ses.allowprivport = 0;
d7cc5b484a2e - Port restriction code back in Matt Johnston <matt@ucc.asn.au> parents: 6 diff changeset	123
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	124 TRACE(("leave session_init"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	127 void session_loop(void(*loophandler)()) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	128
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	129 fd_set readfd, writefd;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	130 struct timeval timeout;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	131 int val;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	132
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	133 /* main loop, select()s for all sockets in use */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	134 for(;;) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	135
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	136 timeout.tv_sec = select_timeout();
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	137 timeout.tv_usec = 0;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	138 FD_ZERO(&writefd);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	139 FD_ZERO(&readfd);
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 165 diff changeset	140 dropbear_assert(ses.payload == NULL);
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	141 if (ses.sock_in != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	142 FD_SET(ses.sock_in, &readfd);
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	143 }
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	144 if (ses.sock_out != -1 && !isempty(&ses.writequeue)) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	145 FD_SET(ses.sock_out, &writefd);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	146 }
416 a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	147
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	148 /* We get woken up when signal handlers write to this pipe.
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	149 SIGCHLD in svr-chansession is the only one currently. */
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	150 FD_SET(ses.signal_pipe[0], &readfd);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	151
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	152 /* set up for channels which require reading/writing */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	153 if (ses.dataallowed) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	154 setchannelfds(&readfd, &writefd);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	155 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	156 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	157
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	158 if (exitflag) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	159 dropbear_exit("Terminated by signal");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	160 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	161
373 70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	162 if (val < 0 && errno != EINTR) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	163 dropbear_exit("Error in select");
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	164 }
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	165
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	166 if (val <= 0) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	167 /* If we were interrupted or the select timed out, we still
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	168 * want to iterate over channels etc for reading, to handle
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	169 * server processes exiting etc.
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	170 * We don't want to read/write FDs. */
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	171 FD_ZERO(&writefd);
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal Matt Johnston <matt@ucc.asn.au> parents: 344 diff changeset	172 FD_ZERO(&readfd);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	173 }
416 a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	174
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	175 /* We'll just empty out the pipe if required. We don't do
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	176 any thing with the data, since the pipe's purpose is purely to
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	177 wake up the select() above. */
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	178 if (FD_ISSET(ses.signal_pipe[0], &readfd)) {
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	179 char x;
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	180 while (read(ses.signal_pipe[0], &x, 1) > 0) {}
a01c0c8e543a Improve behaviour when flushing out after a process has exited. Matt Johnston <matt@ucc.asn.au> parents: 373 diff changeset	181 }
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	182
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	183 /* check for auth timeout, rekeying required etc */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	184 checktimeouts();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	185
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	186 /* process session socket's incoming/outgoing data */
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	187 if (ses.sock_out != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	188 if (FD_ISSET(ses.sock_out, &writefd) && !isempty(&ses.writequeue)) {
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	189 write_packet();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	190 }
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	191 }
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	192
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	193 if (ses.sock_in != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	194 if (FD_ISSET(ses.sock_in, &readfd)) {
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	195 read_packet();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	196 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	197
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	198 /* Process the decrypted packet. After this, the read buffer
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	199 * will be ready for a new packet */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	200 if (ses.payload != NULL) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	201 process_packet();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	202 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	203 }
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	204
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	205 /* if required, flush out any queued reply packets that
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	206 were being held up during a KEX */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	207 maybe_flush_reply_queue();
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	208
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	209 /* process pipes etc for the channels, ses.dataallowed == 0
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	210 * during rekeying ) */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	211 if (ses.dataallowed) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	212 channelio(&readfd, &writefd);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	213 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	214
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	215 if (loophandler) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	216 loophandler();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	217 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	218
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	219 } /* for(;;) */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	220
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	221 /* Not reached */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	222 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	223
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224 /* clean up a session on exit */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 void common_session_cleanup() {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	227 TRACE(("enter session_cleanup"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229 /* we can't cleanup if we don't know the session state */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 if (!sessinitdone) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	231 TRACE(("leave session_cleanup: !sessinitdone"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232 return;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 m_free(ses.session_id);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 m_burn(ses.keys, sizeof(struct key_context));
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 m_free(ses.keys);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 chancleanup();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	241 TRACE(("leave session_cleanup"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	245 void session_identification() {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247 /* max length of 255 chars */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248 char linebuf[256];
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 int len = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	250 char done = 0;
103 8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	251 int i;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	252
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	253 /* write our version string, this blocks */
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	254 if (atomicio(write, ses.sock_out, LOCAL_IDENT "\r\n",
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	255 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) {
344 bf29e6659fb9 Just use the normal "remote closed" handler when reading ident stings Matt Johnston <matt@ucc.asn.au> parents: 275 diff changeset	256 ses.remoteclosed();
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	257 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	258
275 7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	259 /* If they send more than 50 lines, something is wrong */
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	260 for (i = 0; i < 50; i++) {
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	261 len = ident_readln(ses.sock_in, linebuf, sizeof(linebuf));
103 8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	262
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	263 if (len < 0 && errno != EINTR) {
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	264 /* It failed */
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	265 break;
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	266 }
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	267
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	268 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	269 /* start of line matches */
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	270 done = 1;
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	271 break;
8aeac62a968f Allow leading lines before the ident banner when connecting Matt Johnston <matt@ucc.asn.au> parents: 41 diff changeset	272 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	274
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275 if (!done) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	276 TRACE(("err: %s for '%s'\n", strerror(errno), linebuf))
344 bf29e6659fb9 Just use the normal "remote closed" handler when reading ident stings Matt Johnston <matt@ucc.asn.au> parents: 275 diff changeset	277 ses.remoteclosed();
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278 } else {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 /* linebuf is already null terminated */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280 ses.remoteident = m_malloc(len);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 memcpy(ses.remoteident, linebuf, len);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283
275 7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	284 /* Shall assume that 2.x will be backwards compatible. */
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	285 if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	286 && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	287 dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	288 }
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible Matt Johnston <matt@ucc.asn.au> parents: 242 diff changeset	289
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	290 TRACE(("remoteident: %s", ses.remoteident))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 /* returns the length including null-terminating zero on success,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295 * or -1 on failure */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296 static int ident_readln(int fd, char* buf, int count) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 char in;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299 int pos = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 int num = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301 fd_set fds;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 struct timeval timeout;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	304 TRACE(("enter ident_readln"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306 if (count < 1) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307 return -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310 FD_ZERO(&fds);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312 /* select since it's a non-blocking fd */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	313
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	314 /* leave space to null-terminate */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315 while (pos < count-1) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	316
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	317 FD_SET(fd, &fds);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 timeout.tv_sec = 1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 timeout.tv_usec = 0;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323 continue;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	325 TRACE(("leave ident_readln: select error"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 return -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 checktimeouts();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331 /* Have to go one byte at a time, since we don't want to read past
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332 * the end, and have to somehow shove bytes back into the normal
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333 * packet reader */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 if (FD_ISSET(fd, &fds)) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	335 num = read(fd, &in, 1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 /* a "\n" is a newline, "\r" we want to read in and keep going
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337 * so that it won't be read as part of the next line */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	338 if (num < 0) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339 /* error */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340 if (errno == EINTR) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 continue; /* not a real error */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	343 TRACE(("leave ident_readln: read error"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 return -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346 if (num == 0) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 /* EOF */
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	348 TRACE(("leave ident_readln: EOF"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349 return -1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351 if (in == '\n') {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 /* end of ident string */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 break;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 /* we don't want to include '\r's */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	356 if (in != '\r') {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357 buf[pos] = in;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358 pos++;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 buf[pos] = '\0';
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	364 TRACE(("leave ident_readln: return %d", pos+1))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 return pos+1;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	368 void send_msg_ignore() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	369 CHECKCLEARTOWRITE();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	370 buf_putbyte(ses.writepayload, SSH_MSG_IGNORE);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	371 buf_putstring(ses.writepayload, "", 0);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	372 encrypt_packet();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	373 }
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	374
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	375 /* Check all timeouts which are required. Currently these are the time for
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	376 * user authentication, and the automatic rekeying. */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	377 static void checktimeouts() {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	378
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	379 time_t now;
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	380
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	381 now = time(NULL);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	382
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	383 if (ses.connect_time != 0 && now - ses.connect_time >= AUTH_TIMEOUT) {
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	384 dropbear_close("Timeout before auth");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	385 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	386
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	387 /* we can't rekey if we haven't done remote ident exchange yet */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	388 if (ses.remoteident == NULL) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	389 return;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	390 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	391
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	392 if (!ses.kexstate.sentkexinit
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	393 && (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	394 \|\| ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 135 diff changeset	395 TRACE(("rekeying after timeout or max data reached"))
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	396 send_msg_kexinit();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	397 }
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	398
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	399 if (opts.keepalive_secs > 0
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	400 && now - ses.last_packet_time >= opts.keepalive_secs) {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	401 send_msg_ignore();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	402 }
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	403 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	404
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	405 static long select_timeout() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	406 /* determine the minimum timeout that might be required, so
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	407 as to avoid waking when unneccessary */
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	408 long ret = LONG_MAX;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	409 if (KEX_REKEY_TIMEOUT > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	410 ret = MIN(KEX_REKEY_TIMEOUT, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	411 if (AUTH_TIMEOUT > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	412 ret = MIN(AUTH_TIMEOUT, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	413 if (opts.keepalive_secs > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	414 ret = MIN(opts.keepalive_secs, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	415 return ret;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	416 }
482 7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	417
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	418 const char* get_user_shell() {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	419 /* an empty shell should be interpreted as "/bin/sh" */
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	420 if (ses.authstate.pw_shell[0] == '\0') {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	421 return "/bin/sh";
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	422 } else {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	423 return ses.authstate.pw_shell;
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	424 }
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	425 }

Mercurial > dropbear

annotate common-session.c @ 482:7ad49f34a122