=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/clientloop.c,v retrieving revision 1.26 retrieving revision 1.26.2.3 diff -u -r1.26 -r1.26.2.3 --- src/usr.bin/ssh/clientloop.c 2000/05/08 17:42:24 1.26 +++ src/usr.bin/ssh/clientloop.c 2001/03/12 15:44:09 1.26.2.3 @@ -1,35 +1,86 @@ /* - * - * clientloop.c - * * Author: Tatu Ylonen - * * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved + * The main loop for the interactive session (client side). * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * incompatible with the protocol description in the RFC file, it must be + * called by a name other than "ssh" or "Secure Shell". * - * Created: Sat Sep 23 12:23:57 1995 ylo * - * The main loop for the interactive session (client side). + * Copyright (c) 1999 Theo de Raadt. All rights reserved. * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * * SSH2 support added by Markus Friedl. + * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "includes.h" -RCSID("$Id: clientloop.c,v 1.26 2000/05/08 17:42:24 markus Exp $"); +RCSID("$OpenBSD: clientloop.c,v 1.26.2.3 2001/03/12 15:44:09 jason Exp $"); -#include "xmalloc.h" #include "ssh.h" +#include "ssh1.h" +#include "ssh2.h" +#include "xmalloc.h" #include "packet.h" #include "buffer.h" -#include "authfd.h" -#include "readconf.h" - -#include "ssh2.h" #include "compat.h" #include "channels.h" #include "dispatch.h" +#include "buffer.h" +#include "bufaux.h" +#include "key.h" +#include "log.h" +#include "readconf.h" +#include "clientloop.h" +#include "authfd.h" +#include "atomicio.h" +/* import options */ +extern Options options; /* Flag indicating that stdin should be redirected from /dev/null. */ extern int stdin_null_flag; @@ -62,6 +113,8 @@ static int in_non_blocking_mode = 0; /* Common data for the client loop code. */ +static int quit_pending; /* Set to non-zero to quit the client loop. */ +static int escape_char; /* Escape character. */ static int escape_pending; /* Last character was the escape character */ static int last_was_cr; /* Last character was a newline. */ static int exit_status; /* Used to store the exit status of the command. */ @@ -69,22 +122,18 @@ static Buffer stdin_buffer; /* Buffer for stdin data. */ static Buffer stdout_buffer; /* Buffer for stdout data. */ static Buffer stderr_buffer; /* Buffer for stderr data. */ -static unsigned int buffer_high;/* Soft max buffer size. */ -static int max_fd; /* Maximum file descriptor number in select(). */ +static u_long stdin_bytes, stdout_bytes, stderr_bytes; +static u_int buffer_high;/* Soft max buffer size. */ static int connection_in; /* Connection to server (input). */ static int connection_out; /* Connection to server (output). */ -static unsigned long stdin_bytes, stdout_bytes, stderr_bytes; -static int quit_pending; /* Set to non-zero to quit the client loop. */ -static int escape_char; /* Escape character. */ - void client_init_dispatch(void); int session_ident = -1; /* Returns the user\'s terminal to normal mode if it had been put in raw mode. */ void -leave_raw_mode() +leave_raw_mode(void) { if (!in_raw_mode) return; @@ -98,7 +147,7 @@ /* Puts the user\'s terminal in raw mode. */ void -enter_raw_mode() +enter_raw_mode(void) { struct termios tio; @@ -124,7 +173,7 @@ /* Restores stdin to blocking mode. */ void -leave_non_blocking() +leave_non_blocking(void) { if (in_non_blocking_mode) { (void) fcntl(fileno(stdin), F_SETFL, 0); @@ -136,7 +185,7 @@ /* Puts stdin terminal in non-blocking mode. */ void -enter_non_blocking() +enter_non_blocking(void) { in_non_blocking_mode = 1; (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); @@ -178,7 +227,7 @@ */ double -get_current_time() +get_current_time(void) { struct timeval tv; gettimeofday(&tv, NULL); @@ -192,7 +241,7 @@ */ void -client_check_initial_eof_on_stdin() +client_check_initial_eof_on_stdin(void) { int len; char buf[1]; @@ -228,7 +277,7 @@ * and also process it as an escape character if * appropriate. */ - if ((unsigned char) buf[0] == escape_char) + if ((u_char) buf[0] == escape_char) escape_pending = 1; else { buffer_append(&stdin_buffer, buf, 1); @@ -246,9 +295,9 @@ */ void -client_make_packets_from_stdin_data() +client_make_packets_from_stdin_data(void) { - unsigned int len; + u_int len; /* Send buffered stdin data to the server. */ while (buffer_len(&stdin_buffer) > 0 && @@ -277,7 +326,7 @@ */ void -client_check_window_change() +client_check_window_change(void) { struct winsize ws; @@ -289,7 +338,7 @@ if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) return; - debug("client_check_window_change: changed"); + debug2("client_check_window_change: changed"); if (compat20) { channel_request_start(session_ident, "window-change", 0); @@ -314,48 +363,38 @@ */ void -client_wait_until_can_do_something(fd_set * readset, fd_set * writeset) +client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, + int *maxfdp) { - /*debug("client_wait_until_can_do_something"); */ + /* Add any selections by the channel mechanism. */ + channel_prepare_select(readsetp, writesetp, maxfdp); - /* Initialize select masks. */ - FD_ZERO(readset); - FD_ZERO(writeset); - if (!compat20) { /* Read from the connection, unless our buffers are full. */ if (buffer_len(&stdout_buffer) < buffer_high && buffer_len(&stderr_buffer) < buffer_high && channel_not_very_much_buffered_data()) - FD_SET(connection_in, readset); + FD_SET(connection_in, *readsetp); /* * Read from stdin, unless we have seen EOF or have very much * buffered data to send to the server. */ if (!stdin_eof && packet_not_very_much_data_to_write()) - FD_SET(fileno(stdin), readset); + FD_SET(fileno(stdin), *readsetp); /* Select stdout/stderr if have data in buffer. */ if (buffer_len(&stdout_buffer) > 0) - FD_SET(fileno(stdout), writeset); + FD_SET(fileno(stdout), *writesetp); if (buffer_len(&stderr_buffer) > 0) - FD_SET(fileno(stderr), writeset); + FD_SET(fileno(stderr), *writesetp); } else { - FD_SET(connection_in, readset); + FD_SET(connection_in, *readsetp); } - /* Add any selections by the channel mechanism. */ - channel_prepare_select(readset, writeset); - /* Select server connection if have data to write to the server. */ if (packet_have_data_to_write()) - FD_SET(connection_out, writeset); + FD_SET(connection_out, *writesetp); -/* move UP XXX */ - /* Update maximum file descriptor number, if appropriate. */ - if (channel_max_fd() > max_fd) - max_fd = channel_max_fd(); - /* * Wait for something to happen. This will suspend the process until * some selected descriptor can be read, written, or has some other @@ -365,11 +404,17 @@ * SSH_MSG_IGNORE packet when the timeout expires. */ - if (select(max_fd + 1, readset, writeset, NULL, NULL) < 0) { + if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) { char buf[100]; - /* Some systems fail to clear these automatically. */ - FD_ZERO(readset); - FD_ZERO(writeset); + + /* + * We have to clear the select masks, because we return. + * We have to return, because the mainloop checks for the flags + * set by the signal handlers. + */ + memset(*readsetp, 0, *maxfdp); + memset(*writesetp, 0, *maxfdp); + if (errno == EINTR) return; /* Note: we might still have data in the buffers. */ @@ -381,17 +426,15 @@ } void -client_suspend_self() +client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr) { struct winsize oldws, newws; /* Flush stdout and stderr buffers. */ - if (buffer_len(&stdout_buffer) > 0) - atomicio(write, fileno(stdout), buffer_ptr(&stdout_buffer), - buffer_len(&stdout_buffer)); - if (buffer_len(&stderr_buffer) > 0) - atomicio(write, fileno(stderr), buffer_ptr(&stderr_buffer), - buffer_len(&stderr_buffer)); + if (buffer_len(bout) > 0) + atomicio(write, fileno(stdout), buffer_ptr(bout), buffer_len(bout)); + if (buffer_len(berr) > 0) + atomicio(write, fileno(stderr), buffer_ptr(berr), buffer_len(berr)); leave_raw_mode(); @@ -399,9 +442,9 @@ * Free (and clear) the buffer to reduce the amount of data that gets * written to swap. */ - buffer_free(&stdin_buffer); - buffer_free(&stdout_buffer); - buffer_free(&stderr_buffer); + buffer_free(bin); + buffer_free(bout); + buffer_free(berr); /* Save old window size. */ ioctl(fileno(stdin), TIOCGWINSZ, &oldws); @@ -418,9 +461,9 @@ received_window_change_signal = 1; /* OK, we have been continued by the user. Reinitialize buffers. */ - buffer_init(&stdin_buffer); - buffer_init(&stdout_buffer); - buffer_init(&stderr_buffer); + buffer_init(bin); + buffer_init(bout); + buffer_init(berr); enter_raw_mode(); } @@ -438,7 +481,6 @@ if (FD_ISSET(connection_in, readset)) { /* Read as much as possible. */ len = read(connection_in, buf, sizeof(buf)); -/*debug("read connection_in len %d", len); XXX */ if (len == 0) { /* Received EOF. The remote host has closed the connection. */ snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n", @@ -468,12 +510,155 @@ } } +/* process the characters one by one */ +int +process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len) +{ + char string[1024]; + pid_t pid; + int bytes = 0; + u_int i; + u_char ch; + char *s; + + for (i = 0; i < len; i++) { + /* Get one character at a time. */ + ch = buf[i]; + + if (escape_pending) { + /* We have previously seen an escape character. */ + /* Clear the flag now. */ + escape_pending = 0; + + /* Process the escaped character. */ + switch (ch) { + case '.': + /* Terminate the connection. */ + snprintf(string, sizeof string, "%c.\r\n", escape_char); + buffer_append(berr, string, strlen(string)); + /*stderr_bytes += strlen(string); XXX*/ + + quit_pending = 1; + return -1; + + case 'Z' - 64: + /* Suspend the program. */ + /* Print a message to that effect to the user. */ + snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char); + buffer_append(berr, string, strlen(string)); + /*stderr_bytes += strlen(string); XXX*/ + + /* Restore terminal modes and suspend. */ + client_suspend_self(bin, bout, berr); + + /* We have been continued. */ + continue; + + case '&': + /* XXX does not work yet with proto 2 */ + if (compat20) + continue; + /* + * Detach the program (continue to serve connections, + * but put in background and no more new connections). + */ + if (!stdin_eof) { + /* + * Sending SSH_CMSG_EOF alone does not always appear + * to be enough. So we try to send an EOF character + * first. + */ + packet_start(SSH_CMSG_STDIN_DATA); + packet_put_string("\004", 1); + packet_send(); + /* Close stdin. */ + stdin_eof = 1; + if (buffer_len(bin) == 0) { + packet_start(SSH_CMSG_EOF); + packet_send(); + } + } + /* Restore tty modes. */ + leave_raw_mode(); + + /* Stop listening for new connections. */ + channel_stop_listening(); + + printf("%c& [backgrounded]\n", escape_char); + + /* Fork into background. */ + pid = fork(); + if (pid < 0) { + error("fork: %.100s", strerror(errno)); + continue; + } + if (pid != 0) { /* This is the parent. */ + /* The parent just exits. */ + exit(0); + } + /* The child continues serving connections. */ + continue; /*XXX ? */ + + case '?': + snprintf(string, sizeof string, +"%c?\r\n\ +Supported escape sequences:\r\n\ +~. - terminate connection\r\n\ +~^Z - suspend ssh\r\n\ +~# - list forwarded connections\r\n\ +~& - background ssh (when waiting for connections to terminate)\r\n\ +~? - this message\r\n\ +~~ - send the escape character by typing it twice\r\n\ +(Note that escapes are only recognized immediately after newline.)\r\n", + escape_char); + buffer_append(berr, string, strlen(string)); + continue; + + case '#': + snprintf(string, sizeof string, "%c#\r\n", escape_char); + buffer_append(berr, string, strlen(string)); + s = channel_open_message(); + buffer_append(berr, s, strlen(s)); + xfree(s); + continue; + + default: + if (ch != escape_char) { + buffer_put_char(bin, escape_char); + bytes++; + } + /* Escaped characters fall through here */ + break; + } + } else { + /* + * The previous character was not an escape char. Check if this + * is an escape. + */ + if (last_was_cr && ch == escape_char) { + /* It is. Set the flag and continue to next character. */ + escape_pending = 1; + continue; + } + } + + /* + * Normal character. Record whether it was a newline, + * and append it to the buffer. + */ + last_was_cr = (ch == '\r' || ch == '\n'); + buffer_put_char(bin, ch); + bytes++; + } + return bytes; +} + void client_process_input(fd_set * readset) { + int ret; int len; - pid_t pid; - char buf[8192], *s; + char buf[8192]; /* Read input from stdin. */ if (FD_ISSET(fileno(stdin), readset)) { @@ -515,145 +700,10 @@ * Normal, successful read. But we have an escape character * and have to process the characters one by one. */ - unsigned int i; - for (i = 0; i < len; i++) { - unsigned char ch; - /* Get one character at a time. */ - ch = buf[i]; - - if (escape_pending) { - /* We have previously seen an escape character. */ - /* Clear the flag now. */ - escape_pending = 0; - /* Process the escaped character. */ - switch (ch) { - case '.': - /* Terminate the connection. */ - snprintf(buf, sizeof buf, "%c.\r\n", escape_char); - buffer_append(&stderr_buffer, buf, strlen(buf)); - stderr_bytes += strlen(buf); - quit_pending = 1; - return; - - case 'Z' - 64: - /* Suspend the program. */ - /* Print a message to that effect to the user. */ - snprintf(buf, sizeof buf, "%c^Z\r\n", escape_char); - buffer_append(&stderr_buffer, buf, strlen(buf)); - stderr_bytes += strlen(buf); - - /* Restore terminal modes and suspend. */ - client_suspend_self(); - - /* We have been continued. */ - continue; - - case '&': - /* - * Detach the program (continue to serve connections, - * but put in background and no more new connections). - */ - if (!stdin_eof) { - /* - * Sending SSH_CMSG_EOF alone does not always appear - * to be enough. So we try to send an EOF character - * first. - */ - packet_start(SSH_CMSG_STDIN_DATA); - packet_put_string("\004", 1); - packet_send(); - /* Close stdin. */ - stdin_eof = 1; - if (buffer_len(&stdin_buffer) == 0) { - packet_start(SSH_CMSG_EOF); - packet_send(); - } - } - /* Restore tty modes. */ - leave_raw_mode(); - - /* Stop listening for new connections. */ - channel_stop_listening(); - - printf("%c& [backgrounded]\n", escape_char); - - /* Fork into background. */ - pid = fork(); - if (pid < 0) { - error("fork: %.100s", strerror(errno)); - continue; - } - if (pid != 0) { /* This is the parent. */ - /* The parent just exits. */ - exit(0); - } - /* The child continues serving connections. */ - continue; - - case '?': - snprintf(buf, sizeof buf, -"%c?\r\n\ -Supported escape sequences:\r\n\ -~. - terminate connection\r\n\ -~^Z - suspend ssh\r\n\ -~# - list forwarded connections\r\n\ -~& - background ssh (when waiting for connections to terminate)\r\n\ -~? - this message\r\n\ -~~ - send the escape character by typing it twice\r\n\ -(Note that escapes are only recognized immediately after newline.)\r\n", - escape_char); - buffer_append(&stderr_buffer, buf, strlen(buf)); - continue; - - case '#': - snprintf(buf, sizeof buf, "%c#\r\n", escape_char); - buffer_append(&stderr_buffer, buf, strlen(buf)); - s = channel_open_message(); - buffer_append(&stderr_buffer, s, strlen(s)); - xfree(s); - continue; - - default: - if (ch != escape_char) { - /* - * Escape character followed by non-special character. - * Append both to the input buffer. - */ - buf[0] = escape_char; - buf[1] = ch; - buffer_append(&stdin_buffer, buf, 2); - stdin_bytes += 2; - continue; - } - /* - * Note that escape character typed twice - * falls through here; the latter gets processed - * as a normal character below. - */ - break; - } - } else { - /* - * The previous character was not an escape char. Check if this - * is an escape. - */ - if (last_was_cr && ch == escape_char) { - /* It is. Set the flag and continue to next character. */ - escape_pending = 1; - continue; - } - } - - /* - * Normal character. Record whether it was a newline, - * and append it to the buffer. - */ - last_was_cr = (ch == '\r' || ch == '\n'); - buf[0] = ch; - buffer_append(&stdin_buffer, buf, 1); - stdin_bytes += 1; - continue; - } + ret = process_escapes(&stdin_buffer, &stdout_buffer, &stderr_buffer, buf, len); + if (ret == -1) + return; + stdout_bytes += ret; } } } @@ -719,11 +769,20 @@ */ void -client_process_buffered_input_packets() +client_process_buffered_input_packets(void) { - dispatch_run(DISPATCH_NONBLOCK, &quit_pending); + dispatch_run(DISPATCH_NONBLOCK, &quit_pending, NULL); } +/* scan buf[] for '~' before sending data to the peer */ + +int +simple_escape_filter(Channel *c, char *buf, int len) +{ + /* XXX we assume c->extended is writeable */ + return process_escapes(&c->input, &c->output, &c->extended, buf, len); +} + /* * Implements the interactive session with the server. This is called after * the user has been authenticated, and a command has been started on the @@ -732,9 +791,10 @@ */ int -client_loop(int have_pty, int escape_char_arg) +client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id) { - extern Options options; + fd_set *readset = NULL, *writeset = NULL; + int max_fd = 0; double start_time, total_time; int len; char buf[100]; @@ -751,9 +811,13 @@ buffer_high = 64 * 1024; connection_in = packet_get_connection_in(); connection_out = packet_get_connection_out(); - max_fd = connection_in; - if (connection_out > max_fd) - max_fd = connection_out; + max_fd = MAX(connection_in, connection_out); + + if (!compat20) { + max_fd = MAX(max_fd, fileno(stdin)); + max_fd = MAX(max_fd, fileno(stdout)); + max_fd = MAX(max_fd, fileno(stderr)); + } stdin_bytes = 0; stdout_bytes = 0; stderr_bytes = 0; @@ -778,19 +842,24 @@ if (have_pty) enter_raw_mode(); - /* Check if we should immediately send of on stdin. */ - if (!compat20) + if (compat20) { + session_ident = ssh2_chan_id; + if (escape_char != -1) + channel_register_filter(session_ident, + simple_escape_filter); + } else { + /* Check if we should immediately send eof on stdin. */ client_check_initial_eof_on_stdin(); + } /* Main loop of the client for the interactive session mode. */ while (!quit_pending) { - fd_set readset, writeset; /* Process buffered packets sent by the server. */ client_process_buffered_input_packets(); if (compat20 && !channel_still_open()) { - debug("!channel_still_open."); + debug2("!channel_still_open."); break; } @@ -802,7 +871,7 @@ client_make_packets_from_stdin_data(); /* - * Make packets from buffered channel data, and buffer them + * Make packets from buffered channel data, and enqueue them * for sending to the server. */ if (packet_not_very_much_data_to_write()) @@ -821,34 +890,38 @@ * Wait until we have something to do (something becomes * available on one of the descriptors). */ - client_wait_until_can_do_something(&readset, &writeset); + client_wait_until_can_do_something(&readset, &writeset, &max_fd); if (quit_pending) break; /* Do channel operations. */ - channel_after_select(&readset, &writeset); + channel_after_select(readset, writeset); /* Buffer input from the connection. */ - client_process_net_input(&readset); + client_process_net_input(readset); if (quit_pending) break; if (!compat20) { /* Buffer data from stdin */ - client_process_input(&readset); + client_process_input(readset); /* * Process output to stdout and stderr. Output to * the connection is processed elsewhere (above). */ - client_process_output(&writeset); + client_process_output(writeset); } /* Send as much buffered packet data as possible to the sender. */ - if (FD_ISSET(connection_out, &writeset)) + if (FD_ISSET(connection_out, writeset)) packet_write_poll(); } + if (readset) + xfree(readset); + if (writeset) + xfree(writeset); /* Terminate the session. */ @@ -916,9 +989,9 @@ /*********/ void -client_input_stdout_data(int type, int plen) +client_input_stdout_data(int type, int plen, void *ctxt) { - unsigned int data_len; + u_int data_len; char *data = packet_get_string(&data_len); packet_integrity_check(plen, 4 + data_len, type); buffer_append(&stdout_buffer, data, data_len); @@ -927,9 +1000,9 @@ xfree(data); } void -client_input_stderr_data(int type, int plen) +client_input_stderr_data(int type, int plen, void *ctxt) { - unsigned int data_len; + u_int data_len; char *data = packet_get_string(&data_len); packet_integrity_check(plen, 4 + data_len, type); buffer_append(&stderr_buffer, data, data_len); @@ -938,7 +1011,7 @@ xfree(data); } void -client_input_exit_status(int type, int plen) +client_input_exit_status(int type, int plen, void *ctxt) { packet_integrity_check(plen, 4, type); exit_status = packet_get_int(); @@ -954,14 +1027,102 @@ quit_pending = 1; } +Channel * +client_request_forwarded_tcpip(const char *request_type, int rchan) +{ + Channel* c = NULL; + char *listen_address, *originator_address; + int listen_port, originator_port; + int sock, newch; + + /* Get rest of the packet */ + listen_address = packet_get_string(NULL); + listen_port = packet_get_int(); + originator_address = packet_get_string(NULL); + originator_port = packet_get_int(); + packet_done(); + + debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d", + listen_address, listen_port, originator_address, originator_port); + + sock = channel_connect_by_listen_adress(listen_port); + if (sock >= 0) { + newch = channel_new("forwarded-tcpip", + SSH_CHANNEL_CONNECTING, sock, sock, -1, + CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, + xstrdup(originator_address), 1); + c = channel_lookup(newch); + } + xfree(originator_address); + xfree(listen_address); + return c; +} + +Channel* +client_request_x11(const char *request_type, int rchan) +{ + Channel *c = NULL; + char *originator; + int originator_port; + int sock, newch; + + if (!options.forward_x11) { + error("Warning: ssh server tried X11 forwarding."); + error("Warning: this is probably a break in attempt by a malicious server."); + return NULL; + } + originator = packet_get_string(NULL); + if (datafellows & SSH_BUG_X11FWD) { + debug2("buggy server: x11 request w/o originator_port"); + originator_port = 0; + } else { + originator_port = packet_get_int(); + } + packet_done(); + /* XXX check permission */ + debug("client_request_x11: request from %s %d", originator, + originator_port); + sock = x11_connect_display(); + if (sock >= 0) { + newch = channel_new("x11", + SSH_CHANNEL_X11_OPEN, sock, sock, -1, + CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, + xstrdup("x11"), 1); + c = channel_lookup(newch); + } + xfree(originator); + return c; +} + +Channel* +client_request_agent(const char *request_type, int rchan) +{ + Channel *c = NULL; + int sock, newch; + + if (!options.forward_agent) { + error("Warning: ssh server tried agent forwarding."); + error("Warning: this is probably a break in attempt by a malicious server."); + return NULL; + } + sock = ssh_get_authentication_socket(); + if (sock >= 0) { + newch = channel_new("authentication agent connection", + SSH_CHANNEL_OPEN, sock, sock, -1, + CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0, + xstrdup("authentication agent connection"), 1); + c = channel_lookup(newch); + } + return c; +} + /* XXXX move to generic input handler */ void -client_input_channel_open(int type, int plen) +client_input_channel_open(int type, int plen, void *ctxt) { Channel *c = NULL; char *ctype; - int id; - unsigned int len; + u_int len; int rchan; int rmaxpack; int rwindow; @@ -974,28 +1135,12 @@ debug("client_input_channel_open: ctype %s rchan %d win %d max %d", ctype, rchan, rwindow, rmaxpack); - if (strcmp(ctype, "x11") == 0) { - int sock; - char *originator; - int originator_port; - originator = packet_get_string(NULL); - if (datafellows & SSH_BUG_X11FWD) { - debug("buggy server: x11 request w/o originator_port"); - originator_port = 0; - } else { - originator_port = packet_get_int(); - } - packet_done(); - /* XXX check permission */ - xfree(originator); - /* XXX move to channels.c */ - sock = x11_connect_display(); - if (sock >= 0) { - id = channel_new("x11", SSH_CHANNEL_X11_OPEN, - sock, sock, -1, 4*1024, 32*1024, 0, - xstrdup("x11")); - c = channel_lookup(id); - } + if (strcmp(ctype, "forwarded-tcpip") == 0) { + c = client_request_forwarded_tcpip(ctype, rchan); + } else if (strcmp(ctype, "x11") == 0) { + c = client_request_x11(ctype, rchan); + } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { + c = client_request_agent(ctype, rchan); } /* XXX duplicate : */ if (c != NULL) { @@ -1021,9 +1166,45 @@ } xfree(ctype); } +void +client_input_channel_req(int type, int plen, void *ctxt) +{ + Channel *c = NULL; + int id, reply, success = 0; + char *rtype; + id = packet_get_int(); + rtype = packet_get_string(NULL); + reply = packet_get_char(); + + debug("client_input_channel_req: channel %d rtype %s reply %d", + id, rtype, reply); + + if (session_ident == -1) { + error("client_input_channel_req: no channel %d", session_ident); + } else if (id != session_ident) { + error("client_input_channel_req: channel %d: wrong channel: %d", + session_ident, id); + } + c = channel_lookup(id); + if (c == NULL) { + error("client_input_channel_req: channel %d: unknown channel", id); + } else if (strcmp(rtype, "exit-status") == 0) { + success = 1; + exit_status = packet_get_int(); + packet_done(); + } + if (reply) { + packet_start(success ? + SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); + packet_put_int(c->remote_id); + packet_send(); + } + xfree(rtype); +} + void -client_init_dispatch_20() +client_init_dispatch_20(void) { dispatch_init(&dispatch_protocol_error); dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose); @@ -1033,11 +1214,11 @@ dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open); dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); - dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &channel_input_channel_request); + dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req); dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust); } void -client_init_dispatch_13() +client_init_dispatch_13(void) { dispatch_init(NULL); dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close); @@ -1046,21 +1227,24 @@ dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation); dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure); dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open); - dispatch_set(SSH_SMSG_AGENT_OPEN, &auth_input_open_request); dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status); dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data); dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data); - dispatch_set(SSH_SMSG_X11_OPEN, &x11_input_open); + + dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ? + &auth_input_open_request : &deny_input_open); + dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ? + &x11_input_open : &deny_input_open); } void -client_init_dispatch_15() +client_init_dispatch_15(void) { client_init_dispatch_13(); dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof); dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose); } void -client_init_dispatch() +client_init_dispatch(void) { if (compat20) client_init_dispatch_20(); @@ -1068,50 +1252,4 @@ client_init_dispatch_13(); else client_init_dispatch_15(); -} - -void -client_input_channel_req(int id, void *arg) -{ - Channel *c = NULL; - unsigned int len; - int success = 0; - int reply; - char *rtype; - - rtype = packet_get_string(&len); - reply = packet_get_char(); - - debug("client_input_channel_req: rtype %s reply %d", rtype, reply); - - c = channel_lookup(id); - if (c == NULL) - fatal("session_input_channel_req: channel %d: bad channel", id); - - if (session_ident == -1) { - error("client_input_channel_req: no channel %d", id); - } else if (id != session_ident) { - error("client_input_channel_req: bad channel %d != %d", - id, session_ident); - } else if (strcmp(rtype, "exit-status") == 0) { - success = 1; - exit_status = packet_get_int(); - packet_done(); - } - if (reply) { - packet_start(success ? - SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); - packet_put_int(c->remote_id); - packet_send(); - } - xfree(rtype); -} - -void -client_set_session_ident(int id) -{ - debug("client_set_session_ident: id %d", id); - session_ident = id; - channel_register_callback(id, SSH2_MSG_CHANNEL_REQUEST, - client_input_channel_req, (void *)0); }