=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/clientloop.c,v retrieving revision 1.136 retrieving revision 1.136.2.2 diff -u -r1.136 -r1.136.2.2 --- src/usr.bin/ssh/clientloop.c 2005/03/10 22:01:05 1.136 +++ src/usr.bin/ssh/clientloop.c 2006/02/03 02:53:44 1.136.2.2 @@ -59,7 +59,7 @@ */ #include "includes.h" -RCSID("$OpenBSD: clientloop.c,v 1.136 2005/03/10 22:01:05 deraadt Exp $"); +RCSID("$OpenBSD: clientloop.c,v 1.136.2.2 2006/02/03 02:53:44 brad Exp $"); #include "ssh.h" #include "ssh1.h" @@ -77,6 +77,7 @@ #include "log.h" #include "readconf.h" #include "clientloop.h" +#include "sshconnect.h" #include "authfd.h" #include "atomicio.h" #include "sshpty.h" @@ -113,7 +114,7 @@ static volatile sig_atomic_t received_window_change_signal = 0; static volatile sig_atomic_t received_signal = 0; -/* Flag indicating whether the user\'s terminal is in non-blocking mode. */ +/* Flag indicating whether the user's terminal is in non-blocking mode. */ static int in_non_blocking_mode = 0; /* Common data for the client loop code. */ @@ -140,6 +141,8 @@ struct confirm_ctx { int want_tty; int want_subsys; + int want_x_fwd; + int want_agent_fwd; Buffer cmd; char *term; struct termios tio; @@ -208,6 +211,109 @@ return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0; } +#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" +void +client_x11_get_proto(const char *display, const char *xauth_path, + u_int trusted, char **_proto, char **_data) +{ + char cmd[1024]; + char line[512]; + char xdisplay[512]; + static char proto[512], data[512]; + FILE *f; + int got_data = 0, generated = 0, do_unlink = 0, i; + char *xauthdir, *xauthfile; + struct stat st; + + xauthdir = xauthfile = NULL; + *_proto = proto; + *_data = data; + proto[0] = data[0] = '\0'; + + if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) { + debug("No xauth program."); + } else { + if (display == NULL) { + debug("x11_get_proto: DISPLAY not set"); + return; + } + /* + * Handle FamilyLocal case where $DISPLAY does + * not match an authorization entry. For this we + * just try "xauth list unix:displaynum.screennum". + * XXX: "localhost" match to determine FamilyLocal + * is not perfect. + */ + if (strncmp(display, "localhost:", 10) == 0) { + snprintf(xdisplay, sizeof(xdisplay), "unix:%s", + display + 10); + display = xdisplay; + } + if (trusted == 0) { + xauthdir = xmalloc(MAXPATHLEN); + xauthfile = xmalloc(MAXPATHLEN); + strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); + if (mkdtemp(xauthdir) != NULL) { + do_unlink = 1; + snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile", + xauthdir); + snprintf(cmd, sizeof(cmd), + "%s -f %s generate %s " SSH_X11_PROTO + " untrusted timeout 1200 2>" _PATH_DEVNULL, + xauth_path, xauthfile, display); + debug2("x11_get_proto: %s", cmd); + if (system(cmd) == 0) + generated = 1; + } + } + snprintf(cmd, sizeof(cmd), + "%s %s%s list %s 2>" _PATH_DEVNULL, + xauth_path, + generated ? "-f " : "" , + generated ? xauthfile : "", + display); + debug2("x11_get_proto: %s", cmd); + f = popen(cmd, "r"); + if (f && fgets(line, sizeof(line), f) && + sscanf(line, "%*s %511s %511s", proto, data) == 2) + got_data = 1; + if (f) + pclose(f); + } + + if (do_unlink) { + unlink(xauthfile); + rmdir(xauthdir); + } + if (xauthdir) + xfree(xauthdir); + if (xauthfile) + xfree(xauthfile); + + /* + * If we didn't get authentication data, just make up some + * data. The forwarding code will check the validity of the + * response anyway, and substitute this data. The X11 + * server, however, will ignore this fake data and use + * whatever authentication mechanisms it was using otherwise + * for the local connection. + */ + if (!got_data) { + u_int32_t rnd = 0; + + logit("Warning: No xauth data; " + "using fake authentication data for X11 forwarding."); + strlcpy(proto, SSH_X11_PROTO, sizeof proto); + for (i = 0; i < 16; i++) { + if (i % 4 == 0) + rnd = arc4random(); + snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", + rnd & 0xff); + rnd >>= 8; + } + } +} + /* * This is called when the interactive is entered. This checks if there is * an EOF coming on stdin. We must check this explicitly, as select() does @@ -528,6 +634,7 @@ client_extra_session2_setup(int id, void *arg) { struct confirm_ctx *cctx = arg; + const char *display; Channel *c; int i; @@ -536,6 +643,24 @@ if ((c = channel_lookup(id)) == NULL) fatal("%s: no channel for id %d", __func__, id); + display = getenv("DISPLAY"); + if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { + char *proto, *data; + /* Get reasonable local authentication information. */ + client_x11_get_proto(display, options.xauth_location, + options.forward_x11_trusted, &proto, &data); + /* Request forwarding with authentication spoofing. */ + debug("Requesting X11 forwarding with authentication spoofing."); + x11_request_forwarding_with_spoofing(id, display, proto, data); + /* XXX wait for reply */ + } + + if (cctx->want_agent_fwd && options.forward_agent) { + debug("Requesting authentication agent forwarding."); + channel_request_start(id, "auth-agent-req@openssh.com", 0); + packet_send(); + } + client_session2_setup(id, cctx->want_tty, cctx->want_subsys, cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env, client_subsystem_reply); @@ -556,12 +681,12 @@ { Buffer m; Channel *c; - int client_fd, new_fd[3], ver, i, allowed; + int client_fd, new_fd[3], ver, allowed; socklen_t addrlen; struct sockaddr_storage addr; struct confirm_ctx *cctx; char *cmd; - u_int len, env_len, command, flags; + u_int i, len, env_len, command, flags; uid_t euid; gid_t egid; @@ -601,7 +726,7 @@ buffer_free(&m); return; } - if ((ver = buffer_get_char(&m)) != 1) { + if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { error("%s: wrong client version %d", __func__, ver); buffer_free(&m); close(client_fd); @@ -616,13 +741,15 @@ switch (command) { case SSHMUX_COMMAND_OPEN: - if (options.control_master == 2) + if (options.control_master == SSHCTL_MASTER_ASK || + options.control_master == SSHCTL_MASTER_AUTO_ASK) allowed = ask_permission("Allow shared connection " "to %s? ", host); /* continue below */ break; case SSHMUX_COMMAND_TERMINATE: - if (options.control_master == 2) + if (options.control_master == SSHCTL_MASTER_ASK || + options.control_master == SSHCTL_MASTER_AUTO_ASK) allowed = ask_permission("Terminate shared connection " "to %s? ", host); if (allowed) @@ -633,7 +760,7 @@ buffer_clear(&m); buffer_put_int(&m, allowed); buffer_put_int(&m, getpid()); - if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { + if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { error("%s: client msg_send failed", __func__); close(client_fd); buffer_free(&m); @@ -653,7 +780,7 @@ buffer_clear(&m); buffer_put_int(&m, allowed); buffer_put_int(&m, getpid()); - if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { + if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { error("%s: client msg_send failed", __func__); close(client_fd); buffer_free(&m); @@ -674,7 +801,7 @@ buffer_free(&m); return; } - if ((ver = buffer_get_char(&m)) != 1) { + if ((ver = buffer_get_char(&m)) != SSHMUX_VER) { error("%s: wrong client version %d", __func__, ver); buffer_free(&m); close(client_fd); @@ -685,6 +812,8 @@ memset(cctx, 0, sizeof(*cctx)); cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0; cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0; + cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0; + cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0; cctx->term = buffer_get_string(&m, &len); cmd = buffer_get_string(&m, &len); @@ -718,7 +847,7 @@ /* This roundtrip is just for synchronisation of ttymodes */ buffer_clear(&m); - if (ssh_msg_send(client_fd, /* version */1, &m) == -1) { + if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) { error("%s: client msg_send failed", __func__); close(client_fd); close(new_fd[0]); @@ -786,9 +915,18 @@ logit(" -Lport:host:hostport Request local forward"); logit(" -Rport:host:hostport Request remote forward"); logit(" -KRhostport Cancel remote forward"); + if (!options.permit_local_command) + goto out; + logit(" !args Execute local command"); goto out; } + if (*s == '!' && options.permit_local_command) { + s++; + ssh_local_cmd(s); + goto out; + } + if (*s == 'K') { delete = 1; s++; @@ -866,7 +1004,10 @@ u_char ch; char *s; - for (i = 0; i < len; i++) { + if (len <= 0) + return (0); + + for (i = 0; i < (u_int)len; i++) { /* Get one character at a time. */ ch = buf[i]; @@ -1245,10 +1386,10 @@ session_ident = ssh2_chan_id; if (escape_char != SSH_ESCAPECHAR_NONE) channel_register_filter(session_ident, - simple_escape_filter); + simple_escape_filter, NULL); if (session_ident != -1) channel_register_cleanup(session_ident, - client_channel_closed); + client_channel_closed, 0); } else { /* Check if we should immediately send eof on stdin. */ client_check_initial_eof_on_stdin(); @@ -1547,7 +1688,7 @@ if (!options.forward_x11) { error("Warning: ssh server tried X11 forwarding."); - error("Warning: this is probably a break in attempt by a malicious server."); + error("Warning: this is probably a break-in attempt by a malicious server."); return NULL; } originator = packet_get_string(NULL); @@ -1580,7 +1721,7 @@ if (!options.forward_agent) { error("Warning: ssh server tried agent forwarding."); - error("Warning: this is probably a break in attempt by a malicious server."); + error("Warning: this is probably a break-in attempt by a malicious server."); return NULL; } sock = ssh_get_authentication_socket(); @@ -1749,7 +1890,7 @@ /* Split */ name = xstrdup(env[i]); if ((val = strchr(name, '=')) == NULL) { - free(name); + xfree(name); continue; } *val++ = '\0'; @@ -1763,7 +1904,7 @@ } if (!matched) { debug3("Ignored env %s", name); - free(name); + xfree(name); continue; } @@ -1772,7 +1913,7 @@ packet_put_cstring(name); packet_put_cstring(val); packet_send(); - free(name); + xfree(name); } }