X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/24ca682167d6d1f013d2733d96497cc545ce08f7..556f1c050904b36aa3c83a423d9c50f5ceeff685:/channels.c diff --git a/channels.c b/channels.c index cc2613a8..1586ea39 100644 --- a/channels.c +++ b/channels.c @@ -13,7 +13,7 @@ * called by a name other than "ssh" or "Secure Shell". * * SSH2 support added by Markus Friedl. - * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. + * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. * Copyright (c) 1999 Dug Song. All rights reserved. * Copyright (c) 1999 Theo de Raadt. All rights reserved. * @@ -39,14 +39,13 @@ */ #include "includes.h" -RCSID("$OpenBSD: channels.c,v 1.150 2001/12/20 22:50:24 djm Exp $"); +RCSID("$OpenBSD: channels.c,v 1.184 2002/12/13 10:03:15 markus Exp $"); #include "ssh.h" #include "ssh1.h" #include "ssh2.h" #include "packet.h" #include "xmalloc.h" -#include "uidswap.h" #include "log.h" #include "misc.h" #include "channels.h" @@ -129,10 +128,6 @@ static u_int x11_fake_data_len; #define NUM_SOCKS 10 -/* Name and directory of socket for authentication agent forwarding. */ -static char *auth_sock_name = NULL; -static char *auth_sock_dir = NULL; - /* AF_UNSPEC or AF_INET or AF_INET6 */ static int IPv4or6 = AF_UNSPEC; @@ -146,7 +141,7 @@ channel_lookup(int id) { Channel *c; - if (id < 0 || id > channels_alloc) { + if (id < 0 || id >= channels_alloc) { log("channel_lookup: %d: bad id", id); return NULL; } @@ -191,6 +186,7 @@ channel_register_fds(Channel *c, int rfd, int wfd, int efd, } else { c->isatty = 0; } + c->wfd_isatty = isatty(c->wfd); /* enable nonblocking mode */ if (nonblock) { @@ -210,14 +206,13 @@ channel_register_fds(Channel *c, int rfd, int wfd, int efd, Channel * channel_new(char *ctype, int type, int rfd, int wfd, int efd, - int window, int maxpack, int extusage, char *remote_name, int nonblock) + u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) { int i, found; Channel *c; /* Do initial allocation if this is the first call. */ if (channels_alloc == 0) { - chan_init(); channels_alloc = 10; channels = xmalloc(channels_alloc * sizeof(Channel *)); for (i = 0; i < channels_alloc; i++) @@ -235,6 +230,9 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd, /* There are no free slots. Take last+1 slot and expand the array. */ found = channels_alloc; channels_alloc += 10; + if (channels_alloc > 10000) + fatal("channel_new: internal error: channels_alloc %d " + "too big.", channels_alloc); debug2("channel: expanding %d", channels_alloc); channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); for (i = found; i < channels_alloc; i++) @@ -246,7 +244,9 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd, buffer_init(&c->input); buffer_init(&c->output); buffer_init(&c->extended); - chan_init_iostates(c); + c->ostate = CHAN_OUTPUT_OPEN; + c->istate = CHAN_INPUT_OPEN; + c->flags = 0; channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); c->self = found; c->type = type; @@ -259,12 +259,10 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd, c->remote_name = remote_name; c->remote_window = 0; c->remote_maxpacket = 0; - c->cb_fn = NULL; - c->cb_arg = NULL; - c->cb_event = 0; c->force_drain = 0; c->single_connection = 0; c->detach_user = NULL; + c->confirm = NULL; c->input_filter = NULL; debug("channel %d: new [%s]", found, remote_name); return c; @@ -575,11 +573,12 @@ void channel_send_open(int id) { Channel *c = channel_lookup(id); + if (c == NULL) { log("channel_send_open: %d: bad id", id); return; } - debug("send channel open %d", id); + debug2("channel %d: send open", id); packet_start(SSH2_MSG_CHANNEL_OPEN); packet_put_cstring(c->ctype); packet_put_int(c->self); @@ -588,42 +587,37 @@ channel_send_open(int id) packet_send(); } -void -channel_request(int id, char *service, int wantconfirm) -{ - channel_request_start(id, service, wantconfirm); - packet_send(); - debug("channel request %d: %s", id, service) ; -} void channel_request_start(int id, char *service, int wantconfirm) { Channel *c = channel_lookup(id); + if (c == NULL) { - log("channel_request: %d: bad id", id); + log("channel_request_start: %d: unknown channel id", id); return; } + debug("channel %d: request %s", id, service) ; packet_start(SSH2_MSG_CHANNEL_REQUEST); packet_put_int(c->remote_id); packet_put_cstring(service); packet_put_char(wantconfirm); } void -channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) +channel_register_confirm(int id, channel_callback_fn *fn) { Channel *c = channel_lookup(id); + if (c == NULL) { - log("channel_register_callback: %d: bad id", id); + log("channel_register_comfirm: %d: bad id", id); return; } - c->cb_event = mtype; - c->cb_fn = fn; - c->cb_arg = arg; + c->confirm = fn; } void channel_register_cleanup(int id, channel_callback_fn *fn) { Channel *c = channel_lookup(id); + if (c == NULL) { log("channel_register_cleanup: %d: bad id", id); return; @@ -634,6 +628,7 @@ void channel_cancel_cleanup(int id) { Channel *c = channel_lookup(id); + if (c == NULL) { log("channel_cancel_cleanup: %d: bad id", id); return; @@ -644,6 +639,7 @@ void channel_register_filter(int id, channel_filter_fn *fn) { Channel *c = channel_lookup(id); + if (c == NULL) { log("channel_register_filter: %d: bad id", id); return; @@ -653,15 +649,15 @@ channel_register_filter(int id, channel_filter_fn *fn) void channel_set_fds(int id, int rfd, int wfd, int efd, - int extusage, int nonblock) + int extusage, int nonblock, u_int window_max) { Channel *c = channel_lookup(id); + if (c == NULL || c->type != SSH_CHANNEL_LARVAL) fatal("channel_activate for non-larval channel %d.", id); channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); c->type = SSH_CHANNEL_OPEN; - /* XXX window size? */ - c->local_window = c->local_window_max = c->local_maxpacket * 2; + c->local_window = c->local_window_max = window_max; packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); packet_put_int(c->remote_id); packet_put_int(c->local_window); @@ -703,43 +699,33 @@ channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) } static void -channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) +channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) { - /* test whether sockets are 'alive' for read/write */ - if (c->istate == CHAN_INPUT_OPEN) - if (buffer_len(&c->input) < packet_get_maxsize()) - FD_SET(c->sock, readset); - if (c->ostate == CHAN_OUTPUT_OPEN || - c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - if (buffer_len(&c->output) > 0) { - FD_SET(c->sock, writeset); - } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - chan_obuf_empty(c); - } - } -} + u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); -static void -channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) -{ if (c->istate == CHAN_INPUT_OPEN && - c->remote_window > 0 && - buffer_len(&c->input) < c->remote_window) + limit > 0 && + buffer_len(&c->input) < limit) FD_SET(c->rfd, readset); if (c->ostate == CHAN_OUTPUT_OPEN || c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { if (buffer_len(&c->output) > 0) { FD_SET(c->wfd, writeset); } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - chan_obuf_empty(c); + if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) + debug2("channel %d: obuf_empty delayed efd %d/(%d)", + c->self, c->efd, buffer_len(&c->extended)); + else + chan_obuf_empty(c); } } /** XXX check close conditions, too */ - if (c->efd != -1) { + if (compat20 && c->efd != -1) { if (c->extended_usage == CHAN_EXTENDED_WRITE && buffer_len(&c->extended) > 0) FD_SET(c->efd, writeset); - else if (c->extended_usage == CHAN_EXTENDED_READ && + else if (!(c->flags & CHAN_EOF_SENT) && + c->extended_usage == CHAN_EXTENDED_READ && buffer_len(&c->extended) < c->remote_window) FD_SET(c->efd, readset); } @@ -786,7 +772,7 @@ x11_open_helper(Buffer *b) return 0; /* Parse the lengths of variable-length fields. */ - ucp = (u_char *) buffer_ptr(b); + ucp = buffer_ptr(b); if (ucp[0] == 0x42) { /* Byte order MSB first. */ proto_len = 256 * ucp[6] + ucp[7]; data_len = 256 * ucp[8] + ucp[9]; @@ -837,6 +823,7 @@ static void channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) { int ret = x11_open_helper(&c->output); + if (ret == 1) { /* Start normal processing for the channel. */ c->type = SSH_CHANNEL_OPEN; @@ -867,14 +854,19 @@ channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) if (ret == 1) { c->type = SSH_CHANNEL_OPEN; - if (compat20) - channel_pre_open_20(c, readset, writeset); - else - channel_pre_open_15(c, readset, writeset); + channel_pre_open(c, readset, writeset); } else if (ret == -1) { + log("X11 connection rejected because of wrong authentication."); debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); - chan_read_failed(c); /** force close? */ - chan_write_failed(c); + chan_read_failed(c); + buffer_clear(&c->input); + chan_ibuf_empty(c); + buffer_clear(&c->output); + /* for proto v1, the peer will send an IEOF */ + if (compat20) + chan_write_failed(c); + else + c->type = SSH_CHANNEL_OPEN; debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); } } @@ -883,7 +875,7 @@ channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) static int channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) { - u_char *p, *host; + char *p, *host; int len, have, i, found; char username[256]; struct { @@ -995,7 +987,7 @@ channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) { Channel *nc; struct sockaddr addr; - int newsock, on = 1; + int newsock; socklen_t addrlen; char buf[16384], *remote_ipaddr; int remote_port; @@ -1013,10 +1005,7 @@ channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) error("accept: %.100s", strerror(errno)); return; } - if (setsockopt(newsock, IPPROTO_TCP, TCP_NODELAY, &on, - sizeof on) == -1) - error("setsockopt TCP_NODELAY: %.100s", - strerror(errno)); + set_nodelay(newsock); remote_ipaddr = get_peer_ipaddr(newsock); remote_port = get_peer_port(newsock); snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", @@ -1026,11 +1015,6 @@ channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) SSH_CHANNEL_OPENING, newsock, newsock, -1, c->local_window_max, c->local_maxpacket, 0, xstrdup(buf), 1); - if (nc == NULL) { - close(newsock); - xfree(remote_ipaddr); - return; - } if (compat20) { packet_start(SSH2_MSG_CHANNEL_OPEN); packet_put_cstring("x11"); @@ -1144,15 +1128,11 @@ channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) error("accept: %.100s", strerror(errno)); return; } + set_nodelay(newsock); nc = channel_new(rtype, nextstate, newsock, newsock, -1, c->local_window_max, c->local_maxpacket, 0, xstrdup(rtype), 1); - if (nc == NULL) { - error("channel_post_port_listener: no new channel:"); - close(newsock); - return; - } nc->listening_port = c->listening_port; nc->host_port = c->host_port; strlcpy(nc->path, c->path, sizeof(nc->path)); @@ -1195,11 +1175,6 @@ channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) SSH_CHANNEL_OPENING, newsock, newsock, -1, c->local_window_max, c->local_maxpacket, 0, name, 1); - if (nc == NULL) { - error("channel_post_auth_listener: channel_new failed"); - xfree(name); - close(newsock); - } if (compat20) { packet_start(SSH2_MSG_CHANNEL_OPEN); packet_put_cstring("auth-agent@openssh.com"); @@ -1221,8 +1196,7 @@ channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) socklen_t sz = sizeof(err); if (FD_ISSET(c->sock, writeset)) { - if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, - &sz) < 0) { + if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { err = errno; error("getsockopt SO_ERROR failed"); } @@ -1280,7 +1254,7 @@ channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) chan_mark_dead(c); return -1; } else if (compat13) { - buffer_consume(&c->output, buffer_len(&c->output)); + buffer_clear(&c->output); c->type = SSH_CHANNEL_INPUT_DRAINING; debug("channel %d: input draining.", c->self); } else { @@ -1313,6 +1287,11 @@ channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) buffer_len(&c->output) > 0) { data = buffer_ptr(&c->output); dlen = buffer_len(&c->output); +#ifdef _AIX + /* XXX: Later AIX versions can't push as much data to tty */ + if (compat20 && c->wfd_isatty && dlen > 8*1024) + dlen = 8*1024; +#endif len = write(c->wfd, data, dlen); if (len < 0 && (errno == EINTR || errno == EAGAIN)) return 1; @@ -1322,7 +1301,7 @@ channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) chan_mark_dead(c); return -1; } else if (compat13) { - buffer_consume(&c->output, buffer_len(&c->output)); + buffer_clear(&c->output); debug("channel %d: input draining.", c->self); c->type = SSH_CHANNEL_INPUT_DRAINING; } else { @@ -1414,23 +1393,15 @@ channel_check_window(Channel *c) } static void -channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) +channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) { if (c->delayed) return; channel_handle_rfd(c, readset, writeset); channel_handle_wfd(c, readset, writeset); -} - -static void -channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) -{ - if (c->delayed) + if (!compat20) return; - channel_handle_rfd(c, readset, writeset); - channel_handle_wfd(c, readset, writeset); channel_handle_efd(c, readset, writeset); - channel_check_window(c); } @@ -1438,12 +1409,13 @@ static void channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) { int len; + /* Send buffered output data to the socket. */ if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { len = write(c->sock, buffer_ptr(&c->output), buffer_len(&c->output)); if (len <= 0) - buffer_consume(&c->output, buffer_len(&c->output)); + buffer_clear(&c->output); else buffer_consume(&c->output, len); } @@ -1452,7 +1424,7 @@ channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) static void channel_handler_init_20(void) { - channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; + channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; @@ -1461,13 +1433,13 @@ channel_handler_init_20(void) channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; + channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2; + channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; } static void @@ -1483,19 +1455,19 @@ channel_handler_init_13(void) channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; + channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; + channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; } static void channel_handler_init_15(void) { - channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; + channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; @@ -1506,15 +1478,16 @@ channel_handler_init_15(void) channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; + channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; + channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; } static void channel_handler_init(void) { int i; + for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { channel_pre[i] = NULL; channel_post[i] = NULL; @@ -1614,8 +1587,9 @@ channel_after_select(fd_set * readset, fd_set * writeset) void channel_output_poll(void) { - int len, i; Channel *c; + int i; + u_int len; for (i = 0; i < channels_alloc; i++) { c = channels[i]; @@ -1678,16 +1652,22 @@ channel_output_poll(void) fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); /* * input-buffer is empty and read-socket shutdown: - * tell peer, that we will not send more data: send IEOF + * tell peer, that we will not send more data: send IEOF. + * hack for extended data: delay EOF if EFD still in use. */ - chan_ibuf_empty(c); + if (CHANNEL_EFD_INPUT_ACTIVE(c)) + debug2("channel %d: ibuf_empty delayed efd %d/(%d)", + c->self, c->efd, buffer_len(&c->extended)); + else + chan_ibuf_empty(c); } /* Send extended data, i.e. stderr */ if (compat20 && + !(c->flags & CHAN_EOF_SENT) && c->remote_window > 0 && (len = buffer_len(&c->extended)) > 0 && c->extended_usage == CHAN_EXTENDED_READ) { - debug2("channel %d: rwin %d elen %d euse %d", + debug2("channel %d: rwin %u elen %u euse %d", c->self, c->remote_window, buffer_len(&c->extended), c->extended_usage); if (len > c->remote_window) @@ -1710,7 +1690,7 @@ channel_output_poll(void) /* -- protocol input */ void -channel_input_data(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_data(int type, u_int32_t seq, void *ctxt) { int id; char *data; @@ -1734,7 +1714,6 @@ channel_input_data(int type, int plen, u_int32_t seq, void *ctxt) /* Get the data. */ data = packet_get_string(&data_len); - packet_done(); if (compat20) { if (data_len > c->local_maxpacket) { @@ -1748,20 +1727,18 @@ channel_input_data(int type, int plen, u_int32_t seq, void *ctxt) return; } c->local_window -= data_len; - }else{ - packet_integrity_check(plen, 4 + 4 + data_len, type); } + packet_check_eom(); buffer_append(&c->output, data, data_len); xfree(data); } void -channel_input_extended_data(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_extended_data(int type, u_int32_t seq, void *ctxt) { int id; - int tcode; char *data; - u_int data_len; + u_int data_len, tcode; Channel *c; /* Get the channel number and verify it. */ @@ -1774,6 +1751,13 @@ channel_input_extended_data(int type, int plen, u_int32_t seq, void *ctxt) log("channel %d: ext data for non open", id); return; } + if (c->flags & CHAN_EOF_RCVD) { + if (datafellows & SSH_BUG_EXTEOF) + debug("channel %d: accepting ext data after eof", id); + else + packet_disconnect("Received extended_data after EOF " + "on channel %d.", id); + } tcode = packet_get_int(); if (c->efd == -1 || c->extended_usage != CHAN_EXTENDED_WRITE || @@ -1782,7 +1766,7 @@ channel_input_extended_data(int type, int plen, u_int32_t seq, void *ctxt) return; } data = packet_get_string(&data_len); - packet_done(); + packet_check_eom(); if (data_len > c->local_window) { log("channel %d: rcvd too much extended_data %d, win %d", c->self, data_len, c->local_window); @@ -1796,36 +1780,36 @@ channel_input_extended_data(int type, int plen, u_int32_t seq, void *ctxt) } void -channel_input_ieof(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_ieof(int type, u_int32_t seq, void *ctxt) { int id; Channel *c; - packet_integrity_check(plen, 4, type); - id = packet_get_int(); + packet_check_eom(); c = channel_lookup(id); if (c == NULL) packet_disconnect("Received ieof for nonexistent channel %d.", id); chan_rcvd_ieof(c); /* XXX force input close */ - if (c->force_drain) { + if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { debug("channel %d: FORCE input drain", c->self); c->istate = CHAN_INPUT_WAIT_DRAIN; + if (buffer_len(&c->input) == 0) + chan_ibuf_empty(c); } } void -channel_input_close(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_close(int type, u_int32_t seq, void *ctxt) { int id; Channel *c; - packet_integrity_check(plen, 4, type); - id = packet_get_int(); + packet_check_eom(); c = channel_lookup(id); if (c == NULL) packet_disconnect("Received close for nonexistent channel %d.", id); @@ -1850,30 +1834,31 @@ channel_input_close(int type, int plen, u_int32_t seq, void *ctxt) * Not a closed channel - mark it as draining, which will * cause it to be freed later. */ - buffer_consume(&c->input, buffer_len(&c->input)); + buffer_clear(&c->input); c->type = SSH_CHANNEL_OUTPUT_DRAINING; } } /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ void -channel_input_oclose(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_oclose(int type, u_int32_t seq, void *ctxt) { int id = packet_get_int(); Channel *c = channel_lookup(id); - packet_integrity_check(plen, 4, type); + + packet_check_eom(); if (c == NULL) packet_disconnect("Received oclose for nonexistent channel %d.", id); chan_rcvd_oclose(c); } void -channel_input_close_confirmation(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) { int id = packet_get_int(); Channel *c = channel_lookup(id); - packet_done(); + packet_check_eom(); if (c == NULL) packet_disconnect("Received close confirmation for " "out-of-range channel %d.", id); @@ -1884,14 +1869,11 @@ channel_input_close_confirmation(int type, int plen, u_int32_t seq, void *ctxt) } void -channel_input_open_confirmation(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) { int id, remote_id; Channel *c; - if (!compat20) - packet_integrity_check(plen, 4 + 4, type); - id = packet_get_int(); c = channel_lookup(id); @@ -1906,15 +1888,15 @@ channel_input_open_confirmation(int type, int plen, u_int32_t seq, void *ctxt) if (compat20) { c->remote_window = packet_get_int(); c->remote_maxpacket = packet_get_int(); - packet_done(); - if (c->cb_fn != NULL && c->cb_event == type) { + if (c->confirm) { debug2("callback start"); - c->cb_fn(c->self, c->cb_arg); + c->confirm(c->self, NULL); debug2("callback done"); } - debug("channel %d: open confirm rwindow %d rmax %d", c->self, + debug("channel %d: open confirm rwindow %u rmax %u", c->self, c->remote_window, c->remote_maxpacket); } + packet_check_eom(); } static char * @@ -1934,15 +1916,12 @@ reason2txt(int reason) } void -channel_input_open_failure(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_open_failure(int type, u_int32_t seq, void *ctxt) { int id, reason; char *msg = NULL, *lang = NULL; Channel *c; - if (!compat20) - packet_integrity_check(plen, 4, type); - id = packet_get_int(); c = channel_lookup(id); @@ -1955,7 +1934,6 @@ channel_input_open_failure(int type, int plen, u_int32_t seq, void *ctxt) msg = packet_get_string(NULL); lang = packet_get_string(NULL); } - packet_done(); log("channel %d: open failed: %s%s%s", id, reason2txt(reason), msg ? ": ": "", msg ? msg : ""); if (msg != NULL) @@ -1963,40 +1941,17 @@ channel_input_open_failure(int type, int plen, u_int32_t seq, void *ctxt) if (lang != NULL) xfree(lang); } + packet_check_eom(); /* Free the channel. This will also close the socket. */ channel_free(c); } void -channel_input_channel_request(int type, int plen, u_int32_t seq, void *ctxt) -{ - int id; - Channel *c; - - id = packet_get_int(); - c = channel_lookup(id); - - if (c == NULL || - (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) - packet_disconnect("Received request for " - "non-open channel %d.", id); - if (c->cb_fn != NULL && c->cb_event == type) { - debug2("callback start"); - c->cb_fn(c->self, c->cb_arg); - debug2("callback done"); - } else { - char *service = packet_get_string(NULL); - debug("channel %d: rcvd request for %s", c->self, service); - debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); - xfree(service); - } -} - -void -channel_input_window_adjust(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) { Channel *c; - int id, adjust; + int id; + u_int adjust; if (!compat20) return; @@ -2011,13 +1966,13 @@ channel_input_window_adjust(int type, int plen, u_int32_t seq, void *ctxt) return; } adjust = packet_get_int(); - packet_done(); - debug2("channel %d: rcvd adjust %d", id, adjust); + packet_check_eom(); + debug2("channel %d: rcvd adjust %u", id, adjust); c->remote_window += adjust; } void -channel_input_port_open(int type, int plen, u_int32_t seq, void *ctxt) +channel_input_port_open(int type, u_int32_t seq, void *ctxt) { Channel *c = NULL; u_short host_port; @@ -2033,18 +1988,13 @@ channel_input_port_open(int type, int plen, u_int32_t seq, void *ctxt) } else { originator_string = xstrdup("unknown (remote did not supply name)"); } - packet_done(); + packet_check_eom(); sock = channel_connect_to(host, host_port); if (sock != -1) { c = channel_new("connected socket", SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, originator_string, 1); - if (c == NULL) { - error("channel_input_port_open: channel_new failed"); - close(sock); - } else { - c->remote_id = remote_id; - } + c->remote_id = remote_id; } if (c == NULL) { packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); @@ -2063,53 +2013,29 @@ channel_set_af(int af) IPv4or6 = af; } -/* - * Initiate forwarding of connections to local port "port" through the secure - * channel to host:port from remote side. - */ -int -channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, - u_short port_to_connect, int gateway_ports) -{ - return channel_request_forwarding( - NULL, listen_port, - host_to_connect, port_to_connect, - gateway_ports, /*remote_fwd*/ 0); -} - -/* - * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 - * (SSH_CHANNEL_RPORT_LISTENER). - */ -int -channel_request_forwarding( - const char *listen_address, u_short listen_port, - const char *host_to_connect, u_short port_to_connect, - int gateway_ports, int remote_fwd) +static int +channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, + const char *host_to_connect, u_short port_to_connect, int gateway_ports) { Channel *c; - int success, sock, on = 1, type; + int success, sock, on = 1; struct addrinfo hints, *ai, *aitop; - char ntop[NI_MAXHOST], strport[NI_MAXSERV]; const char *host; - struct linger linger; + char ntop[NI_MAXHOST], strport[NI_MAXSERV]; success = 0; + host = (type == SSH_CHANNEL_RPORT_LISTENER) ? + listen_addr : host_to_connect; - if (remote_fwd) { - host = listen_address; - type = SSH_CHANNEL_RPORT_LISTENER; - } else { - host = host_to_connect; - type = SSH_CHANNEL_PORT_LISTENER; + if (host == NULL) { + error("No forward host name."); + return success; } - if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { error("Forward host name too long."); return success; } - /* XXX listen_address is currently ignored */ /* * getaddrinfo returns a loopback address if the hostname is * set to NULL and hints.ai_flags is not AI_PASSIVE @@ -2127,7 +2053,7 @@ channel_request_forwarding( continue; if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { - error("channel_request_forwarding: getnameinfo failed"); + error("channel_setup_fwd_listener: getnameinfo failed"); continue; } /* Create a port to listen for the host. */ @@ -2138,13 +2064,13 @@ channel_request_forwarding( continue; } /* - * Set socket options. We would like the socket to disappear - * as soon as it has been closed for whatever reason. + * Set socket options. + * Allow local port reuse in TIME_WAIT. */ - setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); - linger.l_onoff = 1; - linger.l_linger = 5; - setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); + if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, + sizeof(on)) == -1) + error("setsockopt SO_REUSEADDR: %s", strerror(errno)); + debug("Local forwarding listening on %s port %s.", ntop, strport); /* Bind the socket to the address. */ @@ -2168,23 +2094,36 @@ channel_request_forwarding( c = channel_new("port listener", type, sock, sock, -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, xstrdup("port listener"), 1); - if (c == NULL) { - error("channel_request_forwarding: channel_new failed"); - close(sock); - continue; - } strlcpy(c->path, host, sizeof(c->path)); c->host_port = port_to_connect; c->listening_port = listen_port; success = 1; } if (success == 0) - error("channel_request_forwarding: cannot listen to port: %d", + error("channel_setup_fwd_listener: cannot listen to port: %d", listen_port); freeaddrinfo(aitop); return success; } +/* protocol local port fwd, used by ssh (and sshd in v1) */ +int +channel_setup_local_fwd_listener(u_short listen_port, + const char *host_to_connect, u_short port_to_connect, int gateway_ports) +{ + return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, + NULL, listen_port, host_to_connect, port_to_connect, gateway_ports); +} + +/* protocol v2 remote port fwd, used by sshd */ +int +channel_setup_remote_fwd_listener(const char *listen_address, + u_short listen_port, int gateway_ports) +{ + return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, + listen_address, listen_port, NULL, 0, gateway_ports); +} + /* * Initiate forwarding of connections to port "port" on remote host through * the secure channel to host:port from local side. @@ -2194,7 +2133,7 @@ void channel_request_remote_forwarding(u_short listen_port, const char *host_to_connect, u_short port_to_connect) { - int payload_len, type, success = 0; + int type, success = 0; /* Record locally that connection to this host/port is permitted. */ if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) @@ -2205,7 +2144,7 @@ channel_request_remote_forwarding(u_short listen_port, const char *address_to_bind = "0.0.0.0"; packet_start(SSH2_MSG_GLOBAL_REQUEST); packet_put_cstring("tcpip-forward"); - packet_put_char(0); /* boolean: want reply */ + packet_put_char(1); /* boolean: want reply */ packet_put_cstring(address_to_bind); packet_put_int(listen_port); packet_send(); @@ -2221,7 +2160,7 @@ channel_request_remote_forwarding(u_short listen_port, packet_write_wait(); /* Wait for response from the remote side. */ - type = packet_read(&payload_len); + type = packet_read(); switch (type) { case SSH_SMSG_SUCCESS: success = 1; @@ -2270,7 +2209,7 @@ channel_input_port_forward_request(int is_root, int gateway_ports) port); #endif /* Initiate forwarding */ - channel_request_local_forwarding(port, hostname, host_port, gateway_ports); + channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports); /* Free the argument string. */ xfree(hostname); @@ -2363,6 +2302,7 @@ connect_to(const char *host, u_short port) return -1; } /* success */ + set_nodelay(sock); return sock; } @@ -2407,12 +2347,12 @@ channel_connect_to(const char *host, u_short port) /* * Creates an internet domain socket for listening for X11 connections. - * Returns a suitable display number for the DISPLAY variable, or -1 if - * an error occurs. + * Returns 0 and a suitable display number for the DISPLAY variable + * stored in display_numberp , or -1 if an error occurs. */ int -x11_create_display_inet(int x11_display_offset, int gateway_ports, - int single_connection) +x11_create_display_inet(int x11_display_offset, int x11_use_localhost, + int single_connection, u_int *display_numberp) { Channel *nc = NULL; int display_number, sock; @@ -2427,7 +2367,7 @@ x11_create_display_inet(int x11_display_offset, int gateway_ports, port = 6000 + display_number; memset(&hints, 0, sizeof(hints)); hints.ai_family = IPv4or6; - hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; + hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; hints.ai_socktype = SOCK_STREAM; snprintf(strport, sizeof strport, "%d", port); if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { @@ -2448,6 +2388,13 @@ x11_create_display_inet(int x11_display_offset, int gateway_ports, continue; } } +#ifdef IPV6_V6ONLY + if (ai->ai_family == AF_INET6) { + int on = 1; + if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) + error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); + } +#endif if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { debug("bind port %d: %.100s", port, strerror(errno)); close(sock); @@ -2466,7 +2413,12 @@ x11_create_display_inet(int x11_display_offset, int gateway_ports, if (num_socks == NUM_SOCKS) break; #else - break; + if (x11_use_localhost) { + if (num_socks == NUM_SOCKS) + break; + } else { + break; + } #endif } freeaddrinfo(aitop); @@ -2494,12 +2446,12 @@ x11_create_display_inet(int x11_display_offset, int gateway_ports, SSH_CHANNEL_X11_LISTENER, sock, sock, -1, CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, xstrdup("X11 inet listener"), 1); - if (nc != NULL) - nc->single_connection = single_connection; + nc->single_connection = single_connection; } /* Return the display number for the DISPLAY environment variable. */ - return display_number; + *display_numberp = display_number; + return (0); } static int @@ -2524,7 +2476,7 @@ connect_local_xsocket(u_int dnr) int x11_connect_display(void) { - int display_number, sock = 0, on = 1; + int display_number, sock = 0; const char *display; char buf[1024], *cp; struct addrinfo hints, *ai, *aitop; @@ -2612,8 +2564,7 @@ x11_connect_display(void) strerror(errno)); return -1; } - if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) == -1) - error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); + set_nodelay(sock); return sock; } @@ -2624,7 +2575,7 @@ x11_connect_display(void) */ void -x11_input_open(int type, int plen, u_int32_t seq, void *ctxt) +x11_input_open(int type, u_int32_t seq, void *ctxt) { Channel *c = NULL; int remote_id, sock = 0; @@ -2639,7 +2590,7 @@ x11_input_open(int type, int plen, u_int32_t seq, void *ctxt) } else { remote_host = xstrdup("unknown (remote did not supply name)"); } - packet_done(); + packet_check_eom(); /* Obtain a connection to the real X display. */ sock = x11_connect_display(); @@ -2648,13 +2599,8 @@ x11_input_open(int type, int plen, u_int32_t seq, void *ctxt) c = channel_new("connected x11 socket", SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, remote_host, 1); - if (c == NULL) { - error("x11_input_open: channel_new failed"); - close(sock); - } else { - c->remote_id = remote_id; - c->force_drain = 1; - } + c->remote_id = remote_id; + c->force_drain = 1; } if (c == NULL) { /* Send refusal to the remote host. */ @@ -2671,9 +2617,10 @@ x11_input_open(int type, int plen, u_int32_t seq, void *ctxt) /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ void -deny_input_open(int type, int plen, u_int32_t seq, void *ctxt) +deny_input_open(int type, u_int32_t seq, void *ctxt) { int rchan = packet_get_int(); + switch (type) { case SSH_SMSG_AGENT_OPEN: error("Warning: ssh server tried agent forwarding."); @@ -2682,7 +2629,7 @@ deny_input_open(int type, int plen, u_int32_t seq, void *ctxt) error("Warning: ssh server tried X11 forwarding."); break; default: - error("deny_input_open: type %d plen %d", type, plen); + error("deny_input_open: type %d", type); break; } error("Warning: this is probably a break in attempt by a malicious server."); @@ -2773,125 +2720,18 @@ auth_request_forwarding(void) packet_write_wait(); } -/* - * Returns the name of the forwarded authentication socket. Returns NULL if - * there is no forwarded authentication socket. The returned value points to - * a static buffer. - */ - -char * -auth_get_socket_name(void) -{ - return auth_sock_name; -} - -/* removes the agent forwarding socket */ - -void -auth_sock_cleanup_proc(void *_pw) -{ - struct passwd *pw = _pw; - - if (auth_sock_name) { - temporarily_use_uid(pw); - unlink(auth_sock_name); - rmdir(auth_sock_dir); - auth_sock_name = NULL; - restore_uid(); - } -} - -/* - * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. - * This starts forwarding authentication requests. - */ - -int -auth_input_request_forwarding(struct passwd * pw) -{ - Channel *nc; - int sock; - struct sockaddr_un sunaddr; - - if (auth_get_socket_name() != NULL) { - error("authentication forwarding requested twice."); - return 0; - } - - /* Temporarily drop privileged uid for mkdir/bind. */ - temporarily_use_uid(pw); - - /* Allocate a buffer for the socket name, and format the name. */ - auth_sock_name = xmalloc(MAXPATHLEN); - auth_sock_dir = xmalloc(MAXPATHLEN); - strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); - - /* Create private directory for socket */ - if (mkdtemp(auth_sock_dir) == NULL) { - packet_send_debug("Agent forwarding disabled: " - "mkdtemp() failed: %.100s", strerror(errno)); - restore_uid(); - xfree(auth_sock_name); - xfree(auth_sock_dir); - auth_sock_name = NULL; - auth_sock_dir = NULL; - return 0; - } - snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d", - auth_sock_dir, (int) getpid()); - - /* delete agent socket on fatal() */ - fatal_add_cleanup(auth_sock_cleanup_proc, pw); - - /* Create the socket. */ - sock = socket(AF_UNIX, SOCK_STREAM, 0); - if (sock < 0) - packet_disconnect("socket: %.100s", strerror(errno)); - - /* Bind it to the name. */ - memset(&sunaddr, 0, sizeof(sunaddr)); - sunaddr.sun_family = AF_UNIX; - strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); - - if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) - packet_disconnect("bind: %.100s", strerror(errno)); - - /* Restore the privileged uid. */ - restore_uid(); - - /* Start listening on the socket. */ - if (listen(sock, 5) < 0) - packet_disconnect("listen: %.100s", strerror(errno)); - - /* Allocate a channel for the authentication agent socket. */ - nc = channel_new("auth socket", - SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, - CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, - 0, xstrdup("auth socket"), 1); - if (nc == NULL) { - error("auth_input_request_forwarding: channel_new failed"); - auth_sock_cleanup_proc(pw); - fatal_remove_cleanup(auth_sock_cleanup_proc, pw); - close(sock); - return 0; - } - strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); - return 1; -} - /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ void -auth_input_open_request(int type, int plen, u_int32_t seq, void *ctxt) +auth_input_open_request(int type, u_int32_t seq, void *ctxt) { Channel *c = NULL; int remote_id, sock; char *name; - packet_integrity_check(plen, 4, type); - /* Read the remote channel number from the message. */ remote_id = packet_get_int(); + packet_check_eom(); /* * Get a connection to the local authentication agent (this may again @@ -2909,14 +2749,8 @@ auth_input_open_request(int type, int plen, u_int32_t seq, void *ctxt) name = xstrdup("authentication agent connection"); c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, -1, 0, 0, 0, name, 1); - if (c == NULL) { - error("auth_input_open_request: channel_new failed"); - xfree(name); - close(sock); - } else { - c->remote_id = remote_id; - c->force_drain = 1; - } + c->remote_id = remote_id; + c->force_drain = 1; } if (c == NULL) { packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);