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1.1 markus 1: /*
2: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3: * All rights reserved
4: */
1.2 markus 5: /*
6: * SSH2 support by Markus Friedl.
7: * Copyright (c) 2000 Markus Friedl. All rights reserved.
8: */
1.1 markus 9:
10: #include "includes.h"
1.12.2.1! jason 11: RCSID("$OpenBSD: session.c,v 1.17 2000/06/05 19:53:40 markus Exp $");
1.1 markus 12:
13: #include "xmalloc.h"
14: #include "ssh.h"
15: #include "pty.h"
16: #include "packet.h"
17: #include "buffer.h"
18: #include "cipher.h"
19: #include "mpaux.h"
20: #include "servconf.h"
21: #include "uidswap.h"
22: #include "compat.h"
23: #include "channels.h"
24: #include "nchan.h"
25:
1.2 markus 26: #include "bufaux.h"
27: #include "ssh2.h"
28: #include "auth.h"
29:
1.1 markus 30: /* types */
31:
32: #define TTYSZ 64
33: typedef struct Session Session;
34: struct Session {
35: int used;
36: int self;
1.7 markus 37: int extended;
1.1 markus 38: struct passwd *pw;
39: pid_t pid;
40: /* tty */
41: char *term;
42: int ptyfd, ttyfd, ptymaster;
43: int row, col, xpixel, ypixel;
44: char tty[TTYSZ];
45: /* X11 */
46: char *display;
47: int screen;
48: char *auth_proto;
49: char *auth_data;
1.7 markus 50: int single_connection;
1.1 markus 51: /* proto 2 */
52: int chanid;
53: };
54:
55: /* func */
56:
57: Session *session_new(void);
58: void session_set_fds(Session *s, int fdin, int fdout, int fderr);
59: void session_pty_cleanup(Session *s);
1.9 markus 60: void session_proctitle(Session *s);
1.1 markus 61: void do_exec_pty(Session *s, const char *command, struct passwd * pw);
62: void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
63:
64: void
65: do_child(const char *command, struct passwd * pw, const char *term,
66: const char *display, const char *auth_proto,
67: const char *auth_data, const char *ttyname);
68:
69: /* import */
70: extern ServerOptions options;
71: extern char *__progname;
72: extern int log_stderr;
73: extern int debug_flag;
74:
75: /* Local Xauthority file. */
76: static char *xauthfile;
77:
78: /* data */
79: #define MAX_SESSIONS 10
80: Session sessions[MAX_SESSIONS];
81:
82: /* Flags set in auth-rsa from authorized_keys flags. These are set in auth-rsa.c. */
83: int no_port_forwarding_flag = 0;
84: int no_agent_forwarding_flag = 0;
85: int no_x11_forwarding_flag = 0;
86: int no_pty_flag = 0;
87:
88: /* RSA authentication "command=" option. */
89: char *forced_command = NULL;
90:
91: /* RSA authentication "environment=" options. */
92: struct envstring *custom_environment = NULL;
93:
94: /*
95: * Remove local Xauthority file.
96: */
97: void
98: xauthfile_cleanup_proc(void *ignore)
99: {
100: debug("xauthfile_cleanup_proc called");
101:
102: if (xauthfile != NULL) {
103: char *p;
104: unlink(xauthfile);
105: p = strrchr(xauthfile, '/');
106: if (p != NULL) {
107: *p = '\0';
108: rmdir(xauthfile);
109: }
110: xfree(xauthfile);
111: xauthfile = NULL;
112: }
113: }
114:
115: /*
116: * Function to perform cleanup if we get aborted abnormally (e.g., due to a
117: * dropped connection).
118: */
1.4 markus 119: void
1.1 markus 120: pty_cleanup_proc(void *session)
121: {
122: Session *s=session;
123: if (s == NULL)
124: fatal("pty_cleanup_proc: no session");
125: debug("pty_cleanup_proc: %s", s->tty);
126:
127: if (s->pid != 0) {
128: /* Record that the user has logged out. */
129: record_logout(s->pid, s->tty);
130: }
131:
132: /* Release the pseudo-tty. */
133: pty_release(s->tty);
134: }
135:
136: /*
137: * Prepares for an interactive session. This is called after the user has
138: * been successfully authenticated. During this message exchange, pseudo
139: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
140: * are requested, etc.
141: */
1.4 markus 142: void
1.1 markus 143: do_authenticated(struct passwd * pw)
144: {
145: Session *s;
146: int type;
147: int compression_level = 0, enable_compression_after_reply = 0;
148: int have_pty = 0;
149: char *command;
150: int n_bytes;
151: int plen;
152: unsigned int proto_len, data_len, dlen;
153:
154: /*
155: * Cancel the alarm we set to limit the time taken for
156: * authentication.
157: */
158: alarm(0);
159:
160: /*
161: * Inform the channel mechanism that we are the server side and that
162: * the client may request to connect to any port at all. (The user
163: * could do it anyway, and we wouldn\'t know what is permitted except
164: * by the client telling us, so we can equally well trust the client
165: * not to request anything bogus.)
166: */
167: if (!no_port_forwarding_flag)
168: channel_permit_all_opens();
169:
170: s = session_new();
1.7 markus 171: s->pw = pw;
1.1 markus 172:
173: /*
174: * We stay in this loop until the client requests to execute a shell
175: * or a command.
176: */
177: for (;;) {
178: int success = 0;
179:
180: /* Get a packet from the client. */
181: type = packet_read(&plen);
182:
183: /* Process the packet. */
184: switch (type) {
185: case SSH_CMSG_REQUEST_COMPRESSION:
186: packet_integrity_check(plen, 4, type);
187: compression_level = packet_get_int();
188: if (compression_level < 1 || compression_level > 9) {
189: packet_send_debug("Received illegal compression level %d.",
190: compression_level);
191: break;
192: }
193: /* Enable compression after we have responded with SUCCESS. */
194: enable_compression_after_reply = 1;
195: success = 1;
196: break;
197:
198: case SSH_CMSG_REQUEST_PTY:
199: if (no_pty_flag) {
200: debug("Allocating a pty not permitted for this authentication.");
201: break;
202: }
203: if (have_pty)
204: packet_disconnect("Protocol error: you already have a pty.");
205:
206: debug("Allocating pty.");
207:
208: /* Allocate a pty and open it. */
209: if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
210: sizeof(s->tty))) {
211: error("Failed to allocate pty.");
212: break;
213: }
214: fatal_add_cleanup(pty_cleanup_proc, (void *)s);
215: pty_setowner(pw, s->tty);
216:
217: /* Get TERM from the packet. Note that the value may be of arbitrary length. */
218: s->term = packet_get_string(&dlen);
219: packet_integrity_check(dlen, strlen(s->term), type);
220: /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
221: /* Remaining bytes */
222: n_bytes = plen - (4 + dlen + 4 * 4);
223:
224: if (strcmp(s->term, "") == 0) {
225: xfree(s->term);
226: s->term = NULL;
227: }
228: /* Get window size from the packet. */
229: s->row = packet_get_int();
230: s->col = packet_get_int();
231: s->xpixel = packet_get_int();
232: s->ypixel = packet_get_int();
233: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
234:
235: /* Get tty modes from the packet. */
236: tty_parse_modes(s->ttyfd, &n_bytes);
237: packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
1.10 markus 238:
239: session_proctitle(s);
1.1 markus 240:
241: /* Indicate that we now have a pty. */
242: success = 1;
243: have_pty = 1;
244: break;
245:
246: case SSH_CMSG_X11_REQUEST_FORWARDING:
247: if (!options.x11_forwarding) {
248: packet_send_debug("X11 forwarding disabled in server configuration file.");
249: break;
250: }
1.12.2.1! jason 251: if (!options.xauth_location) {
! 252: packet_send_debug("No xauth program; cannot forward with spoofing.");
! 253: break;
! 254: }
1.1 markus 255: if (no_x11_forwarding_flag) {
256: packet_send_debug("X11 forwarding not permitted for this authentication.");
257: break;
258: }
259: debug("Received request for X11 forwarding with auth spoofing.");
260: if (s->display != NULL)
261: packet_disconnect("Protocol error: X11 display already set.");
262:
263: s->auth_proto = packet_get_string(&proto_len);
264: s->auth_data = packet_get_string(&data_len);
265: packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
266:
267: if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
268: s->screen = packet_get_int();
269: else
270: s->screen = 0;
271: s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
272:
273: if (s->display == NULL)
274: break;
275:
276: /* Setup to always have a local .Xauthority. */
277: xauthfile = xmalloc(MAXPATHLEN);
278: strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
279: temporarily_use_uid(pw->pw_uid);
280: if (mkdtemp(xauthfile) == NULL) {
281: restore_uid();
282: error("private X11 dir: mkdtemp %s failed: %s",
283: xauthfile, strerror(errno));
284: xfree(xauthfile);
285: xauthfile = NULL;
1.7 markus 286: /* XXXX remove listening channels */
1.1 markus 287: break;
288: }
289: strlcat(xauthfile, "/cookies", MAXPATHLEN);
290: open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
291: restore_uid();
292: fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
293: success = 1;
294: break;
295:
296: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
297: if (no_agent_forwarding_flag || compat13) {
298: debug("Authentication agent forwarding not permitted for this authentication.");
299: break;
300: }
301: debug("Received authentication agent forwarding request.");
1.12.2.1! jason 302: success = auth_input_request_forwarding(pw);
1.1 markus 303: break;
304:
305: case SSH_CMSG_PORT_FORWARD_REQUEST:
306: if (no_port_forwarding_flag) {
307: debug("Port forwarding not permitted for this authentication.");
308: break;
309: }
310: debug("Received TCP/IP port forwarding request.");
1.12 markus 311: channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
1.1 markus 312: success = 1;
313: break;
314:
315: case SSH_CMSG_MAX_PACKET_SIZE:
316: if (packet_set_maxsize(packet_get_int()) > 0)
317: success = 1;
318: break;
319:
320: case SSH_CMSG_EXEC_SHELL:
321: case SSH_CMSG_EXEC_CMD:
322: /* Set interactive/non-interactive mode. */
323: packet_set_interactive(have_pty || s->display != NULL,
324: options.keepalives);
325:
326: if (type == SSH_CMSG_EXEC_CMD) {
327: command = packet_get_string(&dlen);
328: debug("Exec command '%.500s'", command);
329: packet_integrity_check(plen, 4 + dlen, type);
330: } else {
331: command = NULL;
332: packet_integrity_check(plen, 0, type);
333: }
334: if (forced_command != NULL) {
335: command = forced_command;
336: debug("Forced command '%.500s'", forced_command);
337: }
338: if (have_pty)
339: do_exec_pty(s, command, pw);
340: else
341: do_exec_no_pty(s, command, pw);
342:
343: if (command != NULL)
344: xfree(command);
345: /* Cleanup user's local Xauthority file. */
346: if (xauthfile)
347: xauthfile_cleanup_proc(NULL);
348: return;
349:
350: default:
351: /*
352: * Any unknown messages in this phase are ignored,
353: * and a failure message is returned.
354: */
355: log("Unknown packet type received after authentication: %d", type);
356: }
357: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
358: packet_send();
359: packet_write_wait();
360:
361: /* Enable compression now that we have replied if appropriate. */
362: if (enable_compression_after_reply) {
363: enable_compression_after_reply = 0;
364: packet_start_compression(compression_level);
365: }
366: }
367: }
368:
369: /*
370: * This is called to fork and execute a command when we have no tty. This
371: * will call do_child from the child, and server_loop from the parent after
372: * setting up file descriptors and such.
373: */
1.4 markus 374: void
1.1 markus 375: do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
376: {
377: int pid;
378:
379: #ifdef USE_PIPES
380: int pin[2], pout[2], perr[2];
381: /* Allocate pipes for communicating with the program. */
382: if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
383: packet_disconnect("Could not create pipes: %.100s",
384: strerror(errno));
385: #else /* USE_PIPES */
386: int inout[2], err[2];
387: /* Uses socket pairs to communicate with the program. */
388: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
389: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
390: packet_disconnect("Could not create socket pairs: %.100s",
391: strerror(errno));
392: #endif /* USE_PIPES */
393: if (s == NULL)
394: fatal("do_exec_no_pty: no session");
395:
1.9 markus 396: session_proctitle(s);
1.1 markus 397:
398: /* Fork the child. */
399: if ((pid = fork()) == 0) {
400: /* Child. Reinitialize the log since the pid has changed. */
401: log_init(__progname, options.log_level, options.log_facility, log_stderr);
402:
403: /*
404: * Create a new session and process group since the 4.4BSD
405: * setlogin() affects the entire process group.
406: */
407: if (setsid() < 0)
408: error("setsid failed: %.100s", strerror(errno));
409:
410: #ifdef USE_PIPES
411: /*
412: * Redirect stdin. We close the parent side of the socket
413: * pair, and make the child side the standard input.
414: */
415: close(pin[1]);
416: if (dup2(pin[0], 0) < 0)
417: perror("dup2 stdin");
418: close(pin[0]);
419:
420: /* Redirect stdout. */
421: close(pout[0]);
422: if (dup2(pout[1], 1) < 0)
423: perror("dup2 stdout");
424: close(pout[1]);
425:
426: /* Redirect stderr. */
427: close(perr[0]);
428: if (dup2(perr[1], 2) < 0)
429: perror("dup2 stderr");
430: close(perr[1]);
431: #else /* USE_PIPES */
432: /*
433: * Redirect stdin, stdout, and stderr. Stdin and stdout will
434: * use the same socket, as some programs (particularly rdist)
435: * seem to depend on it.
436: */
437: close(inout[1]);
438: close(err[1]);
439: if (dup2(inout[0], 0) < 0) /* stdin */
440: perror("dup2 stdin");
441: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
442: perror("dup2 stdout");
443: if (dup2(err[0], 2) < 0) /* stderr */
444: perror("dup2 stderr");
445: #endif /* USE_PIPES */
446:
447: /* Do processing for the child (exec command etc). */
448: do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
449: /* NOTREACHED */
450: }
451: if (pid < 0)
452: packet_disconnect("fork failed: %.100s", strerror(errno));
453: s->pid = pid;
454: #ifdef USE_PIPES
455: /* We are the parent. Close the child sides of the pipes. */
456: close(pin[0]);
457: close(pout[1]);
458: close(perr[1]);
459:
1.2 markus 460: if (compat20) {
1.7 markus 461: session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
1.2 markus 462: } else {
463: /* Enter the interactive session. */
464: server_loop(pid, pin[1], pout[0], perr[0]);
465: /* server_loop has closed pin[1], pout[1], and perr[1]. */
466: }
1.1 markus 467: #else /* USE_PIPES */
468: /* We are the parent. Close the child sides of the socket pairs. */
469: close(inout[0]);
470: close(err[0]);
471:
472: /*
473: * Enter the interactive session. Note: server_loop must be able to
474: * handle the case that fdin and fdout are the same.
475: */
1.2 markus 476: if (compat20) {
1.7 markus 477: session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
1.2 markus 478: } else {
479: server_loop(pid, inout[1], inout[1], err[1]);
480: /* server_loop has closed inout[1] and err[1]. */
481: }
1.1 markus 482: #endif /* USE_PIPES */
483: }
484:
485: /*
486: * This is called to fork and execute a command when we have a tty. This
487: * will call do_child from the child, and server_loop from the parent after
488: * setting up file descriptors, controlling tty, updating wtmp, utmp,
489: * lastlog, and other such operations.
490: */
1.4 markus 491: void
1.1 markus 492: do_exec_pty(Session *s, const char *command, struct passwd * pw)
493: {
494: FILE *f;
495: char buf[100], *time_string;
496: char line[256];
497: const char *hostname;
498: int fdout, ptyfd, ttyfd, ptymaster;
499: int quiet_login;
500: pid_t pid;
501: socklen_t fromlen;
502: struct sockaddr_storage from;
503: struct stat st;
504: time_t last_login_time;
505:
506: if (s == NULL)
507: fatal("do_exec_pty: no session");
508: ptyfd = s->ptyfd;
509: ttyfd = s->ttyfd;
510:
511: /* Get remote host name. */
512: hostname = get_canonical_hostname();
513:
514: /*
515: * Get the time when the user last logged in. Buf will be set to
516: * contain the hostname the last login was from.
517: */
518: if (!options.use_login) {
519: last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
520: buf, sizeof(buf));
521: }
522:
523: /* Fork the child. */
524: if ((pid = fork()) == 0) {
525: pid = getpid();
526:
527: /* Child. Reinitialize the log because the pid has
528: changed. */
529: log_init(__progname, options.log_level, options.log_facility, log_stderr);
530:
531: /* Close the master side of the pseudo tty. */
532: close(ptyfd);
533:
534: /* Make the pseudo tty our controlling tty. */
535: pty_make_controlling_tty(&ttyfd, s->tty);
536:
537: /* Redirect stdin from the pseudo tty. */
538: if (dup2(ttyfd, fileno(stdin)) < 0)
539: error("dup2 stdin failed: %.100s", strerror(errno));
540:
541: /* Redirect stdout to the pseudo tty. */
542: if (dup2(ttyfd, fileno(stdout)) < 0)
543: error("dup2 stdin failed: %.100s", strerror(errno));
544:
545: /* Redirect stderr to the pseudo tty. */
546: if (dup2(ttyfd, fileno(stderr)) < 0)
547: error("dup2 stdin failed: %.100s", strerror(errno));
548:
549: /* Close the extra descriptor for the pseudo tty. */
550: close(ttyfd);
551:
1.11 markus 552: /* XXXX ? move to do_child() ??*/
1.1 markus 553: /*
554: * Get IP address of client. This is needed because we want
555: * to record where the user logged in from. If the
556: * connection is not a socket, let the ip address be 0.0.0.0.
557: */
558: memset(&from, 0, sizeof(from));
559: if (packet_connection_is_on_socket()) {
560: fromlen = sizeof(from);
561: if (getpeername(packet_get_connection_in(),
562: (struct sockaddr *) & from, &fromlen) < 0) {
563: debug("getpeername: %.100s", strerror(errno));
564: fatal_cleanup();
565: }
566: }
567: /* Record that there was a login on that terminal. */
568: record_login(pid, s->tty, pw->pw_name, pw->pw_uid, hostname,
569: (struct sockaddr *)&from);
570:
571: /* Check if .hushlogin exists. */
572: snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir);
573: quiet_login = stat(line, &st) >= 0;
574:
575: /*
576: * If the user has logged in before, display the time of last
577: * login. However, don't display anything extra if a command
578: * has been specified (so that ssh can be used to execute
579: * commands on a remote machine without users knowing they
580: * are going to another machine). Login(1) will do this for
581: * us as well, so check if login(1) is used
582: */
583: if (command == NULL && last_login_time != 0 && !quiet_login &&
584: !options.use_login) {
585: /* Convert the date to a string. */
586: time_string = ctime(&last_login_time);
587: /* Remove the trailing newline. */
588: if (strchr(time_string, '\n'))
589: *strchr(time_string, '\n') = 0;
590: /* Display the last login time. Host if displayed
591: if known. */
592: if (strcmp(buf, "") == 0)
593: printf("Last login: %s\r\n", time_string);
594: else
595: printf("Last login: %s from %s\r\n", time_string, buf);
596: }
597: /*
598: * Print /etc/motd unless a command was specified or printing
599: * it was disabled in server options or login(1) will be
600: * used. Note that some machines appear to print it in
601: * /etc/profile or similar.
602: */
603: if (command == NULL && options.print_motd && !quiet_login &&
604: !options.use_login) {
605: /* Print /etc/motd if it exists. */
606: f = fopen("/etc/motd", "r");
607: if (f) {
608: while (fgets(line, sizeof(line), f))
609: fputs(line, stdout);
610: fclose(f);
611: }
612: }
613: /* Do common processing for the child, such as execing the command. */
1.12.2.1! jason 614: do_child(command, pw, s->term, s->display, s->auth_proto,
! 615: s->auth_data, s->tty);
1.1 markus 616: /* NOTREACHED */
617: }
618: if (pid < 0)
619: packet_disconnect("fork failed: %.100s", strerror(errno));
620: s->pid = pid;
621:
622: /* Parent. Close the slave side of the pseudo tty. */
623: close(ttyfd);
624:
625: /*
626: * Create another descriptor of the pty master side for use as the
627: * standard input. We could use the original descriptor, but this
628: * simplifies code in server_loop. The descriptor is bidirectional.
629: */
630: fdout = dup(ptyfd);
631: if (fdout < 0)
632: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
633:
634: /* we keep a reference to the pty master */
635: ptymaster = dup(ptyfd);
636: if (ptymaster < 0)
637: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
638: s->ptymaster = ptymaster;
639:
640: /* Enter interactive session. */
1.2 markus 641: if (compat20) {
642: session_set_fds(s, ptyfd, fdout, -1);
643: } else {
644: server_loop(pid, ptyfd, fdout, -1);
645: /* server_loop _has_ closed ptyfd and fdout. */
646: session_pty_cleanup(s);
647: }
1.1 markus 648: }
649:
650: /*
651: * Sets the value of the given variable in the environment. If the variable
652: * already exists, its value is overriden.
653: */
1.4 markus 654: void
1.1 markus 655: child_set_env(char ***envp, unsigned int *envsizep, const char *name,
656: const char *value)
657: {
658: unsigned int i, namelen;
659: char **env;
660:
661: /*
662: * Find the slot where the value should be stored. If the variable
663: * already exists, we reuse the slot; otherwise we append a new slot
664: * at the end of the array, expanding if necessary.
665: */
666: env = *envp;
667: namelen = strlen(name);
668: for (i = 0; env[i]; i++)
669: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
670: break;
671: if (env[i]) {
672: /* Reuse the slot. */
673: xfree(env[i]);
674: } else {
675: /* New variable. Expand if necessary. */
676: if (i >= (*envsizep) - 1) {
677: (*envsizep) += 50;
678: env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
679: }
680: /* Need to set the NULL pointer at end of array beyond the new slot. */
681: env[i + 1] = NULL;
682: }
683:
684: /* Allocate space and format the variable in the appropriate slot. */
685: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
686: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
687: }
688:
689: /*
690: * Reads environment variables from the given file and adds/overrides them
691: * into the environment. If the file does not exist, this does nothing.
692: * Otherwise, it must consist of empty lines, comments (line starts with '#')
693: * and assignments of the form name=value. No other forms are allowed.
694: */
1.4 markus 695: void
1.1 markus 696: read_environment_file(char ***env, unsigned int *envsize,
697: const char *filename)
698: {
699: FILE *f;
700: char buf[4096];
701: char *cp, *value;
702:
703: f = fopen(filename, "r");
704: if (!f)
705: return;
706:
707: while (fgets(buf, sizeof(buf), f)) {
708: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
709: ;
710: if (!*cp || *cp == '#' || *cp == '\n')
711: continue;
712: if (strchr(cp, '\n'))
713: *strchr(cp, '\n') = '\0';
714: value = strchr(cp, '=');
715: if (value == NULL) {
716: fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
717: continue;
718: }
1.12.2.1! jason 719: /*
! 720: * Replace the equals sign by nul, and advance value to
! 721: * the value string.
! 722: */
1.1 markus 723: *value = '\0';
724: value++;
725: child_set_env(env, envsize, cp, value);
726: }
727: fclose(f);
728: }
729:
730: /*
731: * Performs common processing for the child, such as setting up the
732: * environment, closing extra file descriptors, setting the user and group
733: * ids, and executing the command or shell.
734: */
1.4 markus 735: void
1.1 markus 736: do_child(const char *command, struct passwd * pw, const char *term,
737: const char *display, const char *auth_proto,
738: const char *auth_data, const char *ttyname)
739: {
740: const char *shell, *cp = NULL;
741: char buf[256];
1.12.2.1! jason 742: char cmd[1024];
1.1 markus 743: FILE *f;
744: unsigned int envsize, i;
745: char **env;
746: extern char **environ;
747: struct stat st;
748: char *argv[10];
749:
1.12.2.1! jason 750: /* login(1) is only called if we execute the login shell */
! 751: if (options.use_login && command != NULL)
! 752: options.use_login = 0;
! 753:
1.1 markus 754: f = fopen("/etc/nologin", "r");
755: if (f) {
756: /* /etc/nologin exists. Print its contents and exit. */
757: while (fgets(buf, sizeof(buf), f))
758: fputs(buf, stderr);
759: fclose(f);
760: if (pw->pw_uid != 0)
761: exit(254);
762: }
763: /* Set login name in the kernel. */
764: if (setlogin(pw->pw_name) < 0)
765: error("setlogin failed: %s", strerror(errno));
766:
767: /* Set uid, gid, and groups. */
768: /* Login(1) does this as well, and it needs uid 0 for the "-h"
769: switch, so we let login(1) to this for us. */
770: if (!options.use_login) {
771: if (getuid() == 0 || geteuid() == 0) {
772: if (setgid(pw->pw_gid) < 0) {
773: perror("setgid");
774: exit(1);
775: }
776: /* Initialize the group list. */
777: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
778: perror("initgroups");
779: exit(1);
780: }
781: endgrent();
782:
783: /* Permanently switch to the desired uid. */
784: permanently_set_uid(pw->pw_uid);
785: }
786: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
787: fatal("Failed to set uids to %d.", (int) pw->pw_uid);
788: }
789: /*
790: * Get the shell from the password data. An empty shell field is
791: * legal, and means /bin/sh.
792: */
793: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
794:
795: #ifdef AFS
796: /* Try to get AFS tokens for the local cell. */
797: if (k_hasafs()) {
798: char cell[64];
799:
800: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
801: krb_afslog(cell, 0);
802:
803: krb_afslog(0, 0);
804: }
805: #endif /* AFS */
806:
807: /* Initialize the environment. */
808: envsize = 100;
809: env = xmalloc(envsize * sizeof(char *));
810: env[0] = NULL;
811:
812: if (!options.use_login) {
813: /* Set basic environment. */
814: child_set_env(&env, &envsize, "USER", pw->pw_name);
815: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
816: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
817: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
818:
819: snprintf(buf, sizeof buf, "%.200s/%.50s",
820: _PATH_MAILDIR, pw->pw_name);
821: child_set_env(&env, &envsize, "MAIL", buf);
822:
823: /* Normal systems set SHELL by default. */
824: child_set_env(&env, &envsize, "SHELL", shell);
825: }
826: if (getenv("TZ"))
827: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
828:
829: /* Set custom environment options from RSA authentication. */
830: while (custom_environment) {
831: struct envstring *ce = custom_environment;
832: char *s = ce->s;
833: int i;
834: for (i = 0; s[i] != '=' && s[i]; i++);
835: if (s[i] == '=') {
836: s[i] = 0;
837: child_set_env(&env, &envsize, s, s + i + 1);
838: }
839: custom_environment = ce->next;
840: xfree(ce->s);
841: xfree(ce);
842: }
843:
844: snprintf(buf, sizeof buf, "%.50s %d %d",
845: get_remote_ipaddr(), get_remote_port(), get_local_port());
846: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
847:
848: if (ttyname)
849: child_set_env(&env, &envsize, "SSH_TTY", ttyname);
850: if (term)
851: child_set_env(&env, &envsize, "TERM", term);
852: if (display)
853: child_set_env(&env, &envsize, "DISPLAY", display);
854:
855: #ifdef KRB4
856: {
857: extern char *ticket;
858:
859: if (ticket)
860: child_set_env(&env, &envsize, "KRBTKFILE", ticket);
861: }
862: #endif /* KRB4 */
863:
864: if (xauthfile)
865: child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
866: if (auth_get_socket_name() != NULL)
867: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
868: auth_get_socket_name());
869:
870: /* read $HOME/.ssh/environment. */
871: if (!options.use_login) {
1.12.2.1! jason 872: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
! 873: pw->pw_dir);
1.1 markus 874: read_environment_file(&env, &envsize, buf);
875: }
876: if (debug_flag) {
877: /* dump the environment */
878: fprintf(stderr, "Environment:\n");
879: for (i = 0; env[i]; i++)
880: fprintf(stderr, " %.200s\n", env[i]);
881: }
882: /*
883: * Close the connection descriptors; note that this is the child, and
884: * the server will still have the socket open, and it is important
885: * that we do not shutdown it. Note that the descriptors cannot be
886: * closed before building the environment, as we call
887: * get_remote_ipaddr there.
888: */
889: if (packet_get_connection_in() == packet_get_connection_out())
890: close(packet_get_connection_in());
891: else {
892: close(packet_get_connection_in());
893: close(packet_get_connection_out());
894: }
895: /*
896: * Close all descriptors related to channels. They will still remain
897: * open in the parent.
898: */
899: /* XXX better use close-on-exec? -markus */
900: channel_close_all();
901:
902: /*
903: * Close any extra file descriptors. Note that there may still be
904: * descriptors left by system functions. They will be closed later.
905: */
906: endpwent();
907:
908: /*
909: * Close any extra open file descriptors so that we don\'t have them
910: * hanging around in clients. Note that we want to do this after
911: * initgroups, because at least on Solaris 2.3 it leaves file
912: * descriptors open.
913: */
914: for (i = 3; i < 64; i++)
915: close(i);
916:
917: /* Change current directory to the user\'s home directory. */
918: if (chdir(pw->pw_dir) < 0)
919: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
920: pw->pw_dir, strerror(errno));
921:
922: /*
923: * Must take new environment into use so that .ssh/rc, /etc/sshrc and
924: * xauth are run in the proper environment.
925: */
926: environ = env;
927:
928: /*
929: * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
930: * in this order).
931: */
932: if (!options.use_login) {
933: if (stat(SSH_USER_RC, &st) >= 0) {
934: if (debug_flag)
935: fprintf(stderr, "Running /bin/sh %s\n", SSH_USER_RC);
936:
937: f = popen("/bin/sh " SSH_USER_RC, "w");
938: if (f) {
939: if (auth_proto != NULL && auth_data != NULL)
940: fprintf(f, "%s %s\n", auth_proto, auth_data);
941: pclose(f);
942: } else
943: fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
944: } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
945: if (debug_flag)
946: fprintf(stderr, "Running /bin/sh %s\n", SSH_SYSTEM_RC);
947:
948: f = popen("/bin/sh " SSH_SYSTEM_RC, "w");
949: if (f) {
950: if (auth_proto != NULL && auth_data != NULL)
951: fprintf(f, "%s %s\n", auth_proto, auth_data);
952: pclose(f);
953: } else
954: fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
1.12.2.1! jason 955: } else if (options.xauth_location != NULL) {
1.1 markus 956: /* Add authority data to .Xauthority if appropriate. */
957: if (auth_proto != NULL && auth_data != NULL) {
1.12.2.1! jason 958: char *screen = strchr(display, ':');
! 959: if (debug_flag) {
! 960: fprintf(stderr,
! 961: "Running %.100s add %.100s %.100s %.100s\n",
! 962: options.xauth_location, display,
! 963: auth_proto, auth_data);
! 964: if (screen != NULL)
! 965: fprintf(stderr,
! 966: "Adding %.*s/unix%s %s %s\n",
! 967: screen-display, display,
! 968: screen, auth_proto, auth_data);
! 969: }
! 970: snprintf(cmd, sizeof cmd, "%s -q -",
! 971: options.xauth_location);
! 972: f = popen(cmd, "w");
1.1 markus 973: if (f) {
1.12.2.1! jason 974: fprintf(f, "add %s %s %s\n", display,
! 975: auth_proto, auth_data);
! 976: if (screen != NULL)
! 977: fprintf(f, "add %.*s/unix%s %s %s\n",
! 978: screen-display, display,
! 979: screen, auth_proto, auth_data);
1.1 markus 980: pclose(f);
1.12.2.1! jason 981: } else {
! 982: fprintf(stderr, "Could not run %s\n",
! 983: cmd);
! 984: }
1.1 markus 985: }
986: }
987: /* Get the last component of the shell name. */
988: cp = strrchr(shell, '/');
989: if (cp)
990: cp++;
991: else
992: cp = shell;
993: }
994: /*
995: * If we have no command, execute the shell. In this case, the shell
996: * name to be passed in argv[0] is preceded by '-' to indicate that
997: * this is a login shell.
998: */
999: if (!command) {
1000: if (!options.use_login) {
1001: char buf[256];
1002:
1003: /*
1004: * Check for mail if we have a tty and it was enabled
1005: * in server options.
1006: */
1007: if (ttyname && options.check_mail) {
1008: char *mailbox;
1009: struct stat mailstat;
1010: mailbox = getenv("MAIL");
1011: if (mailbox != NULL) {
1.12.2.1! jason 1012: if (stat(mailbox, &mailstat) != 0 ||
! 1013: mailstat.st_size == 0)
1.1 markus 1014: printf("No mail.\n");
1015: else if (mailstat.st_mtime < mailstat.st_atime)
1016: printf("You have mail.\n");
1017: else
1018: printf("You have new mail.\n");
1019: }
1020: }
1021: /* Start the shell. Set initial character to '-'. */
1022: buf[0] = '-';
1023: strncpy(buf + 1, cp, sizeof(buf) - 1);
1024: buf[sizeof(buf) - 1] = 0;
1025:
1026: /* Execute the shell. */
1027: argv[0] = buf;
1028: argv[1] = NULL;
1029: execve(shell, argv, env);
1030:
1031: /* Executing the shell failed. */
1032: perror(shell);
1033: exit(1);
1034:
1035: } else {
1036: /* Launch login(1). */
1037:
1038: execl("/usr/bin/login", "login", "-h", get_remote_ipaddr(),
1039: "-p", "-f", "--", pw->pw_name, NULL);
1040:
1041: /* Login couldn't be executed, die. */
1042:
1043: perror("login");
1044: exit(1);
1045: }
1046: }
1047: /*
1048: * Execute the command using the user's shell. This uses the -c
1049: * option to execute the command.
1050: */
1051: argv[0] = (char *) cp;
1052: argv[1] = "-c";
1053: argv[2] = (char *) command;
1054: argv[3] = NULL;
1055: execve(shell, argv, env);
1056: perror(shell);
1057: exit(1);
1058: }
1059:
1060: Session *
1061: session_new(void)
1062: {
1063: int i;
1064: static int did_init = 0;
1065: if (!did_init) {
1066: debug("session_new: init");
1067: for(i = 0; i < MAX_SESSIONS; i++) {
1068: sessions[i].used = 0;
1069: sessions[i].self = i;
1070: }
1071: did_init = 1;
1072: }
1073: for(i = 0; i < MAX_SESSIONS; i++) {
1074: Session *s = &sessions[i];
1075: if (! s->used) {
1076: s->pid = 0;
1.7 markus 1077: s->extended = 0;
1.1 markus 1078: s->chanid = -1;
1079: s->ptyfd = -1;
1080: s->ttyfd = -1;
1081: s->term = NULL;
1082: s->pw = NULL;
1083: s->display = NULL;
1084: s->screen = 0;
1085: s->auth_data = NULL;
1086: s->auth_proto = NULL;
1087: s->used = 1;
1.7 markus 1088: s->pw = NULL;
1.1 markus 1089: debug("session_new: session %d", i);
1090: return s;
1091: }
1092: }
1093: return NULL;
1094: }
1095:
1096: void
1097: session_dump(void)
1098: {
1099: int i;
1100: for(i = 0; i < MAX_SESSIONS; i++) {
1101: Session *s = &sessions[i];
1102: debug("dump: used %d session %d %p channel %d pid %d",
1103: s->used,
1104: s->self,
1105: s,
1106: s->chanid,
1107: s->pid);
1108: }
1109: }
1110:
1.2 markus 1111: int
1112: session_open(int chanid)
1113: {
1114: Session *s = session_new();
1115: debug("session_open: channel %d", chanid);
1116: if (s == NULL) {
1117: error("no more sessions");
1118: return 0;
1119: }
1.7 markus 1120: s->pw = auth_get_user();
1121: if (s->pw == NULL)
1122: fatal("no user for session %i", s->self);
1.2 markus 1123: debug("session_open: session %d: link with channel %d", s->self, chanid);
1124: s->chanid = chanid;
1125: return 1;
1126: }
1127:
1128: Session *
1129: session_by_channel(int id)
1130: {
1131: int i;
1132: for(i = 0; i < MAX_SESSIONS; i++) {
1133: Session *s = &sessions[i];
1134: if (s->used && s->chanid == id) {
1135: debug("session_by_channel: session %d channel %d", i, id);
1136: return s;
1137: }
1138: }
1139: debug("session_by_channel: unknown channel %d", id);
1140: session_dump();
1141: return NULL;
1142: }
1143:
1144: Session *
1145: session_by_pid(pid_t pid)
1146: {
1147: int i;
1148: debug("session_by_pid: pid %d", pid);
1149: for(i = 0; i < MAX_SESSIONS; i++) {
1150: Session *s = &sessions[i];
1151: if (s->used && s->pid == pid)
1152: return s;
1153: }
1154: error("session_by_pid: unknown pid %d", pid);
1155: session_dump();
1156: return NULL;
1157: }
1158:
1159: int
1160: session_window_change_req(Session *s)
1161: {
1162: s->col = packet_get_int();
1163: s->row = packet_get_int();
1164: s->xpixel = packet_get_int();
1165: s->ypixel = packet_get_int();
1.3 markus 1166: packet_done();
1.2 markus 1167: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1168: return 1;
1169: }
1170:
1171: int
1172: session_pty_req(Session *s)
1173: {
1174: unsigned int len;
1.3 markus 1175: char *term_modes; /* encoded terminal modes */
1.2 markus 1176:
1177: if (s->ttyfd != -1)
1.3 markus 1178: return 0;
1.2 markus 1179: s->term = packet_get_string(&len);
1180: s->col = packet_get_int();
1181: s->row = packet_get_int();
1182: s->xpixel = packet_get_int();
1183: s->ypixel = packet_get_int();
1.3 markus 1184: term_modes = packet_get_string(&len);
1185: packet_done();
1.2 markus 1186:
1187: if (strcmp(s->term, "") == 0) {
1188: xfree(s->term);
1189: s->term = NULL;
1190: }
1191: /* Allocate a pty and open it. */
1192: if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1193: xfree(s->term);
1194: s->term = NULL;
1195: s->ptyfd = -1;
1196: s->ttyfd = -1;
1197: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1198: xfree(term_modes);
1199: return 0;
1.2 markus 1200: }
1201: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1202: /*
1203: * Add a cleanup function to clear the utmp entry and record logout
1204: * time in case we call fatal() (e.g., the connection gets closed).
1205: */
1206: fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1207: pty_setowner(s->pw, s->tty);
1208: /* Get window size from the packet. */
1209: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1210:
1.9 markus 1211: session_proctitle(s);
1212:
1.3 markus 1213: /* XXX parse and set terminal modes */
1214: xfree(term_modes);
1.2 markus 1215: return 1;
1216: }
1217:
1.7 markus 1218: int
1219: session_subsystem_req(Session *s)
1220: {
1221: unsigned int len;
1222: int success = 0;
1223: char *subsys = packet_get_string(&len);
1224:
1225: packet_done();
1226: log("subsystem request for %s", subsys);
1227:
1228: xfree(subsys);
1229: return success;
1230: }
1231:
1232: int
1233: session_x11_req(Session *s)
1234: {
1235: if (!options.x11_forwarding) {
1236: debug("X11 forwarding disabled in server configuration file.");
1237: return 0;
1238: }
1239: if (xauthfile != NULL) {
1240: debug("X11 fwd already started.");
1241: return 0;
1242: }
1243:
1244: debug("Received request for X11 forwarding with auth spoofing.");
1245: if (s->display != NULL)
1246: packet_disconnect("Protocol error: X11 display already set.");
1247:
1248: s->single_connection = packet_get_char();
1249: s->auth_proto = packet_get_string(NULL);
1250: s->auth_data = packet_get_string(NULL);
1251: s->screen = packet_get_int();
1252: packet_done();
1253:
1254: s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1255: if (s->display == NULL) {
1256: xfree(s->auth_proto);
1257: xfree(s->auth_data);
1258: return 0;
1259: }
1260: xauthfile = xmalloc(MAXPATHLEN);
1261: strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1262: temporarily_use_uid(s->pw->pw_uid);
1263: if (mkdtemp(xauthfile) == NULL) {
1264: restore_uid();
1265: error("private X11 dir: mkdtemp %s failed: %s",
1266: xauthfile, strerror(errno));
1267: xfree(xauthfile);
1268: xauthfile = NULL;
1269: xfree(s->auth_proto);
1270: xfree(s->auth_data);
1271: /* XXXX remove listening channels */
1272: return 0;
1273: }
1274: strlcat(xauthfile, "/cookies", MAXPATHLEN);
1275: open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1276: restore_uid();
1277: fatal_add_cleanup(xauthfile_cleanup_proc, s);
1278: return 1;
1279: }
1280:
1.2 markus 1281: void
1282: session_input_channel_req(int id, void *arg)
1283: {
1284: unsigned int len;
1285: int reply;
1286: int success = 0;
1287: char *rtype;
1288: Session *s;
1289: Channel *c;
1290:
1291: rtype = packet_get_string(&len);
1292: reply = packet_get_char();
1293:
1294: s = session_by_channel(id);
1295: if (s == NULL)
1296: fatal("session_input_channel_req: channel %d: no session", id);
1297: c = channel_lookup(id);
1298: if (c == NULL)
1299: fatal("session_input_channel_req: channel %d: bad channel", id);
1300:
1301: debug("session_input_channel_req: session %d channel %d request %s reply %d",
1302: s->self, id, rtype, reply);
1303:
1304: /*
1305: * a session is in LARVAL state until a shell
1306: * or programm is executed
1307: */
1308: if (c->type == SSH_CHANNEL_LARVAL) {
1309: if (strcmp(rtype, "shell") == 0) {
1.3 markus 1310: packet_done();
1.7 markus 1311: s->extended = 1;
1.2 markus 1312: if (s->ttyfd == -1)
1313: do_exec_no_pty(s, NULL, s->pw);
1314: else
1315: do_exec_pty(s, NULL, s->pw);
1316: success = 1;
1317: } else if (strcmp(rtype, "exec") == 0) {
1318: char *command = packet_get_string(&len);
1.3 markus 1319: packet_done();
1.7 markus 1320: s->extended = 1;
1.2 markus 1321: if (s->ttyfd == -1)
1322: do_exec_no_pty(s, command, s->pw);
1323: else
1324: do_exec_pty(s, command, s->pw);
1325: xfree(command);
1326: success = 1;
1327: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1328: success = session_pty_req(s);
1.7 markus 1329: } else if (strcmp(rtype, "x11-req") == 0) {
1330: success = session_x11_req(s);
1331: } else if (strcmp(rtype, "subsystem") == 0) {
1332: success = session_subsystem_req(s);
1.2 markus 1333: }
1334: }
1335: if (strcmp(rtype, "window-change") == 0) {
1336: success = session_window_change_req(s);
1337: }
1338:
1339: if (reply) {
1340: packet_start(success ?
1341: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1342: packet_put_int(c->remote_id);
1343: packet_send();
1344: }
1345: xfree(rtype);
1346: }
1347:
1348: void
1349: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1350: {
1351: if (!compat20)
1352: fatal("session_set_fds: called for proto != 2.0");
1353: /*
1354: * now that have a child and a pipe to the child,
1355: * we can activate our channel and register the fd's
1356: */
1357: if (s->chanid == -1)
1358: fatal("no channel for session %d", s->self);
1359: channel_set_fds(s->chanid,
1360: fdout, fdin, fderr,
1361: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ);
1362: }
1363:
1.1 markus 1364: void
1365: session_pty_cleanup(Session *s)
1366: {
1367: if (s == NULL || s->ttyfd == -1)
1368: return;
1369:
1370: debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1371:
1372: /* Cancel the cleanup function. */
1373: fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1374:
1375: /* Record that the user has logged out. */
1376: record_logout(s->pid, s->tty);
1377:
1378: /* Release the pseudo-tty. */
1379: pty_release(s->tty);
1380:
1381: /*
1382: * Close the server side of the socket pairs. We must do this after
1383: * the pty cleanup, so that another process doesn't get this pty
1384: * while we're still cleaning up.
1385: */
1386: if (close(s->ptymaster) < 0)
1387: error("close(s->ptymaster): %s", strerror(errno));
1.2 markus 1388: }
1389:
1390: void
1391: session_exit_message(Session *s, int status)
1392: {
1393: Channel *c;
1394: if (s == NULL)
1395: fatal("session_close: no session");
1396: c = channel_lookup(s->chanid);
1397: if (c == NULL)
1398: fatal("session_close: session %d: no channel %d",
1399: s->self, s->chanid);
1400: debug("session_exit_message: session %d channel %d pid %d",
1401: s->self, s->chanid, s->pid);
1402:
1403: if (WIFEXITED(status)) {
1404: channel_request_start(s->chanid,
1405: "exit-status", 0);
1406: packet_put_int(WEXITSTATUS(status));
1407: packet_send();
1408: } else if (WIFSIGNALED(status)) {
1409: channel_request_start(s->chanid,
1410: "exit-signal", 0);
1411: packet_put_int(WTERMSIG(status));
1412: packet_put_char(WCOREDUMP(status));
1413: packet_put_cstring("");
1414: packet_put_cstring("");
1415: packet_send();
1416: } else {
1417: /* Some weird exit cause. Just exit. */
1418: packet_disconnect("wait returned status %04x.", status);
1419: }
1420:
1421: /* disconnect channel */
1422: debug("session_exit_message: release channel %d", s->chanid);
1423: channel_cancel_cleanup(s->chanid);
1.5 markus 1424: /*
1425: * emulate a write failure with 'chan_write_failed', nobody will be
1426: * interested in data we write.
1427: * Note that we must not call 'chan_read_failed', since there could
1428: * be some more data waiting in the pipe.
1429: */
1.8 markus 1430: if (c->ostate != CHAN_OUTPUT_CLOSED)
1431: chan_write_failed(c);
1.2 markus 1432: s->chanid = -1;
1433: }
1434:
1435: void
1436: session_free(Session *s)
1437: {
1438: debug("session_free: session %d pid %d", s->self, s->pid);
1439: if (s->term)
1440: xfree(s->term);
1441: if (s->display)
1442: xfree(s->display);
1443: if (s->auth_data)
1444: xfree(s->auth_data);
1445: if (s->auth_proto)
1446: xfree(s->auth_proto);
1447: s->used = 0;
1448: }
1449:
1450: void
1451: session_close(Session *s)
1452: {
1453: session_pty_cleanup(s);
1454: session_free(s);
1.9 markus 1455: session_proctitle(s);
1.2 markus 1456: }
1457:
1458: void
1459: session_close_by_pid(pid_t pid, int status)
1460: {
1461: Session *s = session_by_pid(pid);
1462: if (s == NULL) {
1463: debug("session_close_by_pid: no session for pid %d", s->pid);
1464: return;
1465: }
1466: if (s->chanid != -1)
1467: session_exit_message(s, status);
1468: session_close(s);
1469: }
1470:
1471: /*
1472: * this is called when a channel dies before
1473: * the session 'child' itself dies
1474: */
1475: void
1476: session_close_by_channel(int id, void *arg)
1477: {
1478: Session *s = session_by_channel(id);
1479: if (s == NULL) {
1480: debug("session_close_by_channel: no session for channel %d", id);
1481: return;
1482: }
1483: /* disconnect channel */
1484: channel_cancel_cleanup(s->chanid);
1485: s->chanid = -1;
1486:
1487: debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1488: if (s->pid == 0) {
1489: /* close session immediately */
1490: session_close(s);
1491: } else {
1492: /* notify child, delay session cleanup */
1493: if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1494: error("session_close_by_channel: kill %d: %s",
1495: s->pid, strerror(errno));
1496: }
1.9 markus 1497: }
1498:
1499: char *
1500: session_tty_list(void)
1501: {
1502: static char buf[1024];
1503: int i;
1504: buf[0] = '\0';
1505: for(i = 0; i < MAX_SESSIONS; i++) {
1506: Session *s = &sessions[i];
1507: if (s->used && s->ttyfd != -1) {
1508: if (buf[0] != '\0')
1509: strlcat(buf, ",", sizeof buf);
1510: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1511: }
1512: }
1513: if (buf[0] == '\0')
1514: strlcpy(buf, "notty", sizeof buf);
1515: return buf;
1516: }
1517:
1518: void
1519: session_proctitle(Session *s)
1520: {
1521: if (s->pw == NULL)
1522: error("no user for session %d", s->self);
1523: else
1524: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.2 markus 1525: }
1526:
1527: void
1528: do_authenticated2(void)
1529: {
1530: /*
1531: * Cancel the alarm we set to limit the time taken for
1532: * authentication.
1533: */
1534: alarm(0);
1535: server_loop2();
1.7 markus 1536: if (xauthfile)
1537: xauthfile_cleanup_proc(NULL);
1.1 markus 1538: }