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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"
1.13 ! markus 11: RCSID("$OpenBSD: session.c,v 1.12 2000/05/03 18:03:07 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: }
251: #ifdef XAUTH_PATH
252: if (no_x11_forwarding_flag) {
253: packet_send_debug("X11 forwarding not permitted for this authentication.");
254: break;
255: }
256: debug("Received request for X11 forwarding with auth spoofing.");
257: if (s->display != NULL)
258: packet_disconnect("Protocol error: X11 display already set.");
259:
260: s->auth_proto = packet_get_string(&proto_len);
261: s->auth_data = packet_get_string(&data_len);
262: packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
263:
264: if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
265: s->screen = packet_get_int();
266: else
267: s->screen = 0;
268: s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
269:
270: if (s->display == NULL)
271: break;
272:
273: /* Setup to always have a local .Xauthority. */
274: xauthfile = xmalloc(MAXPATHLEN);
275: strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
276: temporarily_use_uid(pw->pw_uid);
277: if (mkdtemp(xauthfile) == NULL) {
278: restore_uid();
279: error("private X11 dir: mkdtemp %s failed: %s",
280: xauthfile, strerror(errno));
281: xfree(xauthfile);
282: xauthfile = NULL;
1.7 markus 283: /* XXXX remove listening channels */
1.1 markus 284: break;
285: }
286: strlcat(xauthfile, "/cookies", MAXPATHLEN);
287: open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
288: restore_uid();
289: fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
290: success = 1;
291: break;
292: #else /* XAUTH_PATH */
293: packet_send_debug("No xauth program; cannot forward with spoofing.");
294: break;
295: #endif /* XAUTH_PATH */
296:
297: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
298: if (no_agent_forwarding_flag || compat13) {
299: debug("Authentication agent forwarding not permitted for this authentication.");
300: break;
301: }
302: debug("Received authentication agent forwarding request.");
303: auth_input_request_forwarding(pw);
304: success = 1;
305: break;
306:
307: case SSH_CMSG_PORT_FORWARD_REQUEST:
308: if (no_port_forwarding_flag) {
309: debug("Port forwarding not permitted for this authentication.");
310: break;
311: }
312: debug("Received TCP/IP port forwarding request.");
1.12 markus 313: channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
1.1 markus 314: success = 1;
315: break;
316:
317: case SSH_CMSG_MAX_PACKET_SIZE:
318: if (packet_set_maxsize(packet_get_int()) > 0)
319: success = 1;
320: break;
321:
322: case SSH_CMSG_EXEC_SHELL:
323: case SSH_CMSG_EXEC_CMD:
324: /* Set interactive/non-interactive mode. */
325: packet_set_interactive(have_pty || s->display != NULL,
326: options.keepalives);
327:
328: if (type == SSH_CMSG_EXEC_CMD) {
329: command = packet_get_string(&dlen);
330: debug("Exec command '%.500s'", command);
331: packet_integrity_check(plen, 4 + dlen, type);
332: } else {
333: command = NULL;
334: packet_integrity_check(plen, 0, type);
335: }
336: if (forced_command != NULL) {
337: command = forced_command;
338: debug("Forced command '%.500s'", forced_command);
339: }
340: if (have_pty)
341: do_exec_pty(s, command, pw);
342: else
343: do_exec_no_pty(s, command, pw);
344:
345: if (command != NULL)
346: xfree(command);
347: /* Cleanup user's local Xauthority file. */
348: if (xauthfile)
349: xauthfile_cleanup_proc(NULL);
350: return;
351:
352: default:
353: /*
354: * Any unknown messages in this phase are ignored,
355: * and a failure message is returned.
356: */
357: log("Unknown packet type received after authentication: %d", type);
358: }
359: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
360: packet_send();
361: packet_write_wait();
362:
363: /* Enable compression now that we have replied if appropriate. */
364: if (enable_compression_after_reply) {
365: enable_compression_after_reply = 0;
366: packet_start_compression(compression_level);
367: }
368: }
369: }
370:
371: /*
372: * This is called to fork and execute a command when we have no tty. This
373: * will call do_child from the child, and server_loop from the parent after
374: * setting up file descriptors and such.
375: */
1.4 markus 376: void
1.1 markus 377: do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
378: {
379: int pid;
380:
381: #ifdef USE_PIPES
382: int pin[2], pout[2], perr[2];
383: /* Allocate pipes for communicating with the program. */
384: if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
385: packet_disconnect("Could not create pipes: %.100s",
386: strerror(errno));
387: #else /* USE_PIPES */
388: int inout[2], err[2];
389: /* Uses socket pairs to communicate with the program. */
390: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
391: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
392: packet_disconnect("Could not create socket pairs: %.100s",
393: strerror(errno));
394: #endif /* USE_PIPES */
395: if (s == NULL)
396: fatal("do_exec_no_pty: no session");
397:
1.9 markus 398: session_proctitle(s);
1.1 markus 399:
400: /* Fork the child. */
401: if ((pid = fork()) == 0) {
402: /* Child. Reinitialize the log since the pid has changed. */
403: log_init(__progname, options.log_level, options.log_facility, log_stderr);
404:
405: /*
406: * Create a new session and process group since the 4.4BSD
407: * setlogin() affects the entire process group.
408: */
409: if (setsid() < 0)
410: error("setsid failed: %.100s", strerror(errno));
411:
412: #ifdef USE_PIPES
413: /*
414: * Redirect stdin. We close the parent side of the socket
415: * pair, and make the child side the standard input.
416: */
417: close(pin[1]);
418: if (dup2(pin[0], 0) < 0)
419: perror("dup2 stdin");
420: close(pin[0]);
421:
422: /* Redirect stdout. */
423: close(pout[0]);
424: if (dup2(pout[1], 1) < 0)
425: perror("dup2 stdout");
426: close(pout[1]);
427:
428: /* Redirect stderr. */
429: close(perr[0]);
430: if (dup2(perr[1], 2) < 0)
431: perror("dup2 stderr");
432: close(perr[1]);
433: #else /* USE_PIPES */
434: /*
435: * Redirect stdin, stdout, and stderr. Stdin and stdout will
436: * use the same socket, as some programs (particularly rdist)
437: * seem to depend on it.
438: */
439: close(inout[1]);
440: close(err[1]);
441: if (dup2(inout[0], 0) < 0) /* stdin */
442: perror("dup2 stdin");
443: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
444: perror("dup2 stdout");
445: if (dup2(err[0], 2) < 0) /* stderr */
446: perror("dup2 stderr");
447: #endif /* USE_PIPES */
448:
449: /* Do processing for the child (exec command etc). */
450: do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
451: /* NOTREACHED */
452: }
453: if (pid < 0)
454: packet_disconnect("fork failed: %.100s", strerror(errno));
455: s->pid = pid;
456: #ifdef USE_PIPES
457: /* We are the parent. Close the child sides of the pipes. */
458: close(pin[0]);
459: close(pout[1]);
460: close(perr[1]);
461:
1.2 markus 462: if (compat20) {
1.7 markus 463: session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
1.2 markus 464: } else {
465: /* Enter the interactive session. */
466: server_loop(pid, pin[1], pout[0], perr[0]);
467: /* server_loop has closed pin[1], pout[1], and perr[1]. */
468: }
1.1 markus 469: #else /* USE_PIPES */
470: /* We are the parent. Close the child sides of the socket pairs. */
471: close(inout[0]);
472: close(err[0]);
473:
474: /*
475: * Enter the interactive session. Note: server_loop must be able to
476: * handle the case that fdin and fdout are the same.
477: */
1.2 markus 478: if (compat20) {
1.7 markus 479: session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
1.2 markus 480: } else {
481: server_loop(pid, inout[1], inout[1], err[1]);
482: /* server_loop has closed inout[1] and err[1]. */
483: }
1.1 markus 484: #endif /* USE_PIPES */
485: }
486:
487: /*
488: * This is called to fork and execute a command when we have a tty. This
489: * will call do_child from the child, and server_loop from the parent after
490: * setting up file descriptors, controlling tty, updating wtmp, utmp,
491: * lastlog, and other such operations.
492: */
1.4 markus 493: void
1.1 markus 494: do_exec_pty(Session *s, const char *command, struct passwd * pw)
495: {
496: FILE *f;
497: char buf[100], *time_string;
498: char line[256];
499: const char *hostname;
500: int fdout, ptyfd, ttyfd, ptymaster;
501: int quiet_login;
502: pid_t pid;
503: socklen_t fromlen;
504: struct sockaddr_storage from;
505: struct stat st;
506: time_t last_login_time;
507:
508: if (s == NULL)
509: fatal("do_exec_pty: no session");
510: ptyfd = s->ptyfd;
511: ttyfd = s->ttyfd;
512:
513: /* Get remote host name. */
514: hostname = get_canonical_hostname();
515:
516: /*
517: * Get the time when the user last logged in. Buf will be set to
518: * contain the hostname the last login was from.
519: */
520: if (!options.use_login) {
521: last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
522: buf, sizeof(buf));
523: }
524:
525: /* Fork the child. */
526: if ((pid = fork()) == 0) {
527: pid = getpid();
528:
529: /* Child. Reinitialize the log because the pid has
530: changed. */
531: log_init(__progname, options.log_level, options.log_facility, log_stderr);
532:
533: /* Close the master side of the pseudo tty. */
534: close(ptyfd);
535:
536: /* Make the pseudo tty our controlling tty. */
537: pty_make_controlling_tty(&ttyfd, s->tty);
538:
539: /* Redirect stdin from the pseudo tty. */
540: if (dup2(ttyfd, fileno(stdin)) < 0)
541: error("dup2 stdin failed: %.100s", strerror(errno));
542:
543: /* Redirect stdout to the pseudo tty. */
544: if (dup2(ttyfd, fileno(stdout)) < 0)
545: error("dup2 stdin failed: %.100s", strerror(errno));
546:
547: /* Redirect stderr to the pseudo tty. */
548: if (dup2(ttyfd, fileno(stderr)) < 0)
549: error("dup2 stdin failed: %.100s", strerror(errno));
550:
551: /* Close the extra descriptor for the pseudo tty. */
552: close(ttyfd);
553:
1.11 markus 554: /* XXXX ? move to do_child() ??*/
1.1 markus 555: /*
556: * Get IP address of client. This is needed because we want
557: * to record where the user logged in from. If the
558: * connection is not a socket, let the ip address be 0.0.0.0.
559: */
560: memset(&from, 0, sizeof(from));
561: if (packet_connection_is_on_socket()) {
562: fromlen = sizeof(from);
563: if (getpeername(packet_get_connection_in(),
564: (struct sockaddr *) & from, &fromlen) < 0) {
565: debug("getpeername: %.100s", strerror(errno));
566: fatal_cleanup();
567: }
568: }
569: /* Record that there was a login on that terminal. */
570: record_login(pid, s->tty, pw->pw_name, pw->pw_uid, hostname,
571: (struct sockaddr *)&from);
572:
573: /* Check if .hushlogin exists. */
574: snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir);
575: quiet_login = stat(line, &st) >= 0;
576:
577: /*
578: * If the user has logged in before, display the time of last
579: * login. However, don't display anything extra if a command
580: * has been specified (so that ssh can be used to execute
581: * commands on a remote machine without users knowing they
582: * are going to another machine). Login(1) will do this for
583: * us as well, so check if login(1) is used
584: */
585: if (command == NULL && last_login_time != 0 && !quiet_login &&
586: !options.use_login) {
587: /* Convert the date to a string. */
588: time_string = ctime(&last_login_time);
589: /* Remove the trailing newline. */
590: if (strchr(time_string, '\n'))
591: *strchr(time_string, '\n') = 0;
592: /* Display the last login time. Host if displayed
593: if known. */
594: if (strcmp(buf, "") == 0)
595: printf("Last login: %s\r\n", time_string);
596: else
597: printf("Last login: %s from %s\r\n", time_string, buf);
598: }
599: /*
600: * Print /etc/motd unless a command was specified or printing
601: * it was disabled in server options or login(1) will be
602: * used. Note that some machines appear to print it in
603: * /etc/profile or similar.
604: */
605: if (command == NULL && options.print_motd && !quiet_login &&
606: !options.use_login) {
607: /* Print /etc/motd if it exists. */
608: f = fopen("/etc/motd", "r");
609: if (f) {
610: while (fgets(line, sizeof(line), f))
611: fputs(line, stdout);
612: fclose(f);
613: }
614: }
615: /* Do common processing for the child, such as execing the command. */
616: do_child(command, pw, s->term, s->display, s->auth_proto, s->auth_data, s->tty);
617: /* NOTREACHED */
618: }
619: if (pid < 0)
620: packet_disconnect("fork failed: %.100s", strerror(errno));
621: s->pid = pid;
622:
623: /* Parent. Close the slave side of the pseudo tty. */
624: close(ttyfd);
625:
626: /*
627: * Create another descriptor of the pty master side for use as the
628: * standard input. We could use the original descriptor, but this
629: * simplifies code in server_loop. The descriptor is bidirectional.
630: */
631: fdout = dup(ptyfd);
632: if (fdout < 0)
633: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
634:
635: /* we keep a reference to the pty master */
636: ptymaster = dup(ptyfd);
637: if (ptymaster < 0)
638: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
639: s->ptymaster = ptymaster;
640:
641: /* Enter interactive session. */
1.2 markus 642: if (compat20) {
643: session_set_fds(s, ptyfd, fdout, -1);
644: } else {
645: server_loop(pid, ptyfd, fdout, -1);
646: /* server_loop _has_ closed ptyfd and fdout. */
647: session_pty_cleanup(s);
648: }
1.1 markus 649: }
650:
651: /*
652: * Sets the value of the given variable in the environment. If the variable
653: * already exists, its value is overriden.
654: */
1.4 markus 655: void
1.1 markus 656: child_set_env(char ***envp, unsigned int *envsizep, const char *name,
657: const char *value)
658: {
659: unsigned int i, namelen;
660: char **env;
661:
662: /*
663: * Find the slot where the value should be stored. If the variable
664: * already exists, we reuse the slot; otherwise we append a new slot
665: * at the end of the array, expanding if necessary.
666: */
667: env = *envp;
668: namelen = strlen(name);
669: for (i = 0; env[i]; i++)
670: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
671: break;
672: if (env[i]) {
673: /* Reuse the slot. */
674: xfree(env[i]);
675: } else {
676: /* New variable. Expand if necessary. */
677: if (i >= (*envsizep) - 1) {
678: (*envsizep) += 50;
679: env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
680: }
681: /* Need to set the NULL pointer at end of array beyond the new slot. */
682: env[i + 1] = NULL;
683: }
684:
685: /* Allocate space and format the variable in the appropriate slot. */
686: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
687: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
688: }
689:
690: /*
691: * Reads environment variables from the given file and adds/overrides them
692: * into the environment. If the file does not exist, this does nothing.
693: * Otherwise, it must consist of empty lines, comments (line starts with '#')
694: * and assignments of the form name=value. No other forms are allowed.
695: */
1.4 markus 696: void
1.1 markus 697: read_environment_file(char ***env, unsigned int *envsize,
698: const char *filename)
699: {
700: FILE *f;
701: char buf[4096];
702: char *cp, *value;
703:
704: f = fopen(filename, "r");
705: if (!f)
706: return;
707:
708: while (fgets(buf, sizeof(buf), f)) {
709: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
710: ;
711: if (!*cp || *cp == '#' || *cp == '\n')
712: continue;
713: if (strchr(cp, '\n'))
714: *strchr(cp, '\n') = '\0';
715: value = strchr(cp, '=');
716: if (value == NULL) {
717: fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
718: continue;
719: }
720: /* Replace the equals sign by nul, and advance value to the value string. */
721: *value = '\0';
722: value++;
723: child_set_env(env, envsize, cp, value);
724: }
725: fclose(f);
726: }
727:
728: /*
729: * Performs common processing for the child, such as setting up the
730: * environment, closing extra file descriptors, setting the user and group
731: * ids, and executing the command or shell.
732: */
1.4 markus 733: void
1.1 markus 734: do_child(const char *command, struct passwd * pw, const char *term,
735: const char *display, const char *auth_proto,
736: const char *auth_data, const char *ttyname)
737: {
738: const char *shell, *cp = NULL;
739: char buf[256];
740: FILE *f;
741: unsigned int envsize, i;
742: char **env;
743: extern char **environ;
744: struct stat st;
745: char *argv[10];
746:
747: f = fopen("/etc/nologin", "r");
748: if (f) {
749: /* /etc/nologin exists. Print its contents and exit. */
750: while (fgets(buf, sizeof(buf), f))
751: fputs(buf, stderr);
752: fclose(f);
753: if (pw->pw_uid != 0)
754: exit(254);
755: }
756: /* Set login name in the kernel. */
757: if (setlogin(pw->pw_name) < 0)
758: error("setlogin failed: %s", strerror(errno));
759:
760: /* Set uid, gid, and groups. */
761: /* Login(1) does this as well, and it needs uid 0 for the "-h"
762: switch, so we let login(1) to this for us. */
763: if (!options.use_login) {
764: if (getuid() == 0 || geteuid() == 0) {
765: if (setgid(pw->pw_gid) < 0) {
766: perror("setgid");
767: exit(1);
768: }
769: /* Initialize the group list. */
770: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
771: perror("initgroups");
772: exit(1);
773: }
774: endgrent();
775:
776: /* Permanently switch to the desired uid. */
777: permanently_set_uid(pw->pw_uid);
778: }
779: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
780: fatal("Failed to set uids to %d.", (int) pw->pw_uid);
781: }
782: /*
783: * Get the shell from the password data. An empty shell field is
784: * legal, and means /bin/sh.
785: */
786: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
787:
788: #ifdef AFS
789: /* Try to get AFS tokens for the local cell. */
790: if (k_hasafs()) {
791: char cell[64];
792:
793: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
794: krb_afslog(cell, 0);
795:
796: krb_afslog(0, 0);
797: }
798: #endif /* AFS */
799:
800: /* Initialize the environment. */
801: envsize = 100;
802: env = xmalloc(envsize * sizeof(char *));
803: env[0] = NULL;
804:
805: if (!options.use_login) {
806: /* Set basic environment. */
807: child_set_env(&env, &envsize, "USER", pw->pw_name);
808: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
809: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
810: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
811:
812: snprintf(buf, sizeof buf, "%.200s/%.50s",
813: _PATH_MAILDIR, pw->pw_name);
814: child_set_env(&env, &envsize, "MAIL", buf);
815:
816: /* Normal systems set SHELL by default. */
817: child_set_env(&env, &envsize, "SHELL", shell);
818: }
819: if (getenv("TZ"))
820: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
821:
822: /* Set custom environment options from RSA authentication. */
823: while (custom_environment) {
824: struct envstring *ce = custom_environment;
825: char *s = ce->s;
826: int i;
827: for (i = 0; s[i] != '=' && s[i]; i++);
828: if (s[i] == '=') {
829: s[i] = 0;
830: child_set_env(&env, &envsize, s, s + i + 1);
831: }
832: custom_environment = ce->next;
833: xfree(ce->s);
834: xfree(ce);
835: }
836:
837: snprintf(buf, sizeof buf, "%.50s %d %d",
838: get_remote_ipaddr(), get_remote_port(), get_local_port());
839: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
840:
841: if (ttyname)
842: child_set_env(&env, &envsize, "SSH_TTY", ttyname);
843: if (term)
844: child_set_env(&env, &envsize, "TERM", term);
845: if (display)
846: child_set_env(&env, &envsize, "DISPLAY", display);
847:
848: #ifdef KRB4
849: {
850: extern char *ticket;
851:
852: if (ticket)
853: child_set_env(&env, &envsize, "KRBTKFILE", ticket);
854: }
855: #endif /* KRB4 */
856:
857: if (xauthfile)
858: child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
859: if (auth_get_socket_name() != NULL)
860: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
861: auth_get_socket_name());
862:
863: /* read $HOME/.ssh/environment. */
864: if (!options.use_login) {
865: snprintf(buf, sizeof buf, "%.200s/.ssh/environment", pw->pw_dir);
866: read_environment_file(&env, &envsize, buf);
867: }
868: if (debug_flag) {
869: /* dump the environment */
870: fprintf(stderr, "Environment:\n");
871: for (i = 0; env[i]; i++)
872: fprintf(stderr, " %.200s\n", env[i]);
873: }
874: /*
875: * Close the connection descriptors; note that this is the child, and
876: * the server will still have the socket open, and it is important
877: * that we do not shutdown it. Note that the descriptors cannot be
878: * closed before building the environment, as we call
879: * get_remote_ipaddr there.
880: */
881: if (packet_get_connection_in() == packet_get_connection_out())
882: close(packet_get_connection_in());
883: else {
884: close(packet_get_connection_in());
885: close(packet_get_connection_out());
886: }
887: /*
888: * Close all descriptors related to channels. They will still remain
889: * open in the parent.
890: */
891: /* XXX better use close-on-exec? -markus */
892: channel_close_all();
893:
894: /*
895: * Close any extra file descriptors. Note that there may still be
896: * descriptors left by system functions. They will be closed later.
897: */
898: endpwent();
899:
900: /*
901: * Close any extra open file descriptors so that we don\'t have them
902: * hanging around in clients. Note that we want to do this after
903: * initgroups, because at least on Solaris 2.3 it leaves file
904: * descriptors open.
905: */
906: for (i = 3; i < 64; i++)
907: close(i);
908:
909: /* Change current directory to the user\'s home directory. */
910: if (chdir(pw->pw_dir) < 0)
911: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
912: pw->pw_dir, strerror(errno));
913:
914: /*
915: * Must take new environment into use so that .ssh/rc, /etc/sshrc and
916: * xauth are run in the proper environment.
917: */
918: environ = env;
919:
920: /*
921: * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
922: * in this order).
923: */
924: if (!options.use_login) {
925: if (stat(SSH_USER_RC, &st) >= 0) {
926: if (debug_flag)
927: fprintf(stderr, "Running /bin/sh %s\n", SSH_USER_RC);
928:
929: f = popen("/bin/sh " SSH_USER_RC, "w");
930: if (f) {
931: if (auth_proto != NULL && auth_data != NULL)
932: fprintf(f, "%s %s\n", auth_proto, auth_data);
933: pclose(f);
934: } else
935: fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
936: } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
937: if (debug_flag)
938: fprintf(stderr, "Running /bin/sh %s\n", SSH_SYSTEM_RC);
939:
940: f = popen("/bin/sh " SSH_SYSTEM_RC, "w");
941: if (f) {
942: if (auth_proto != NULL && auth_data != NULL)
943: fprintf(f, "%s %s\n", auth_proto, auth_data);
944: pclose(f);
945: } else
946: fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
947: }
948: #ifdef XAUTH_PATH
949: else {
950: /* Add authority data to .Xauthority if appropriate. */
951: if (auth_proto != NULL && auth_data != NULL) {
1.13 ! markus 952: char *screen = strchr(display, ':');
! 953: if (debug_flag) {
1.1 markus 954: fprintf(stderr, "Running %.100s add %.100s %.100s %.100s\n",
1.13 ! markus 955: XAUTH_PATH, display, auth_proto, auth_data);
! 956: if (screen != NULL)
! 957: fprintf(stderr, "Adding %.*s/unix%s %s %s\n",
! 958: screen-display, display, screen, auth_proto, auth_data);
! 959: }
1.1 markus 960: f = popen(XAUTH_PATH " -q -", "w");
961: if (f) {
962: fprintf(f, "add %s %s %s\n", display, auth_proto, auth_data);
1.13 ! markus 963: if (screen != NULL)
! 964: fprintf(f, "add %.*s/unix%s %s %s\n",
! 965: screen-display, display, screen, auth_proto, auth_data);
1.1 markus 966: pclose(f);
967: } else
968: fprintf(stderr, "Could not run %s -q -\n", XAUTH_PATH);
969: }
970: }
971: #endif /* XAUTH_PATH */
972:
973: /* Get the last component of the shell name. */
974: cp = strrchr(shell, '/');
975: if (cp)
976: cp++;
977: else
978: cp = shell;
979: }
980: /*
981: * If we have no command, execute the shell. In this case, the shell
982: * name to be passed in argv[0] is preceded by '-' to indicate that
983: * this is a login shell.
984: */
985: if (!command) {
986: if (!options.use_login) {
987: char buf[256];
988:
989: /*
990: * Check for mail if we have a tty and it was enabled
991: * in server options.
992: */
993: if (ttyname && options.check_mail) {
994: char *mailbox;
995: struct stat mailstat;
996: mailbox = getenv("MAIL");
997: if (mailbox != NULL) {
998: if (stat(mailbox, &mailstat) != 0 || mailstat.st_size == 0)
999: printf("No mail.\n");
1000: else if (mailstat.st_mtime < mailstat.st_atime)
1001: printf("You have mail.\n");
1002: else
1003: printf("You have new mail.\n");
1004: }
1005: }
1006: /* Start the shell. Set initial character to '-'. */
1007: buf[0] = '-';
1008: strncpy(buf + 1, cp, sizeof(buf) - 1);
1009: buf[sizeof(buf) - 1] = 0;
1010:
1011: /* Execute the shell. */
1012: argv[0] = buf;
1013: argv[1] = NULL;
1014: execve(shell, argv, env);
1015:
1016: /* Executing the shell failed. */
1017: perror(shell);
1018: exit(1);
1019:
1020: } else {
1021: /* Launch login(1). */
1022:
1023: execl("/usr/bin/login", "login", "-h", get_remote_ipaddr(),
1024: "-p", "-f", "--", pw->pw_name, NULL);
1025:
1026: /* Login couldn't be executed, die. */
1027:
1028: perror("login");
1029: exit(1);
1030: }
1031: }
1032: /*
1033: * Execute the command using the user's shell. This uses the -c
1034: * option to execute the command.
1035: */
1036: argv[0] = (char *) cp;
1037: argv[1] = "-c";
1038: argv[2] = (char *) command;
1039: argv[3] = NULL;
1040: execve(shell, argv, env);
1041: perror(shell);
1042: exit(1);
1043: }
1044:
1045: Session *
1046: session_new(void)
1047: {
1048: int i;
1049: static int did_init = 0;
1050: if (!did_init) {
1051: debug("session_new: init");
1052: for(i = 0; i < MAX_SESSIONS; i++) {
1053: sessions[i].used = 0;
1054: sessions[i].self = i;
1055: }
1056: did_init = 1;
1057: }
1058: for(i = 0; i < MAX_SESSIONS; i++) {
1059: Session *s = &sessions[i];
1060: if (! s->used) {
1061: s->pid = 0;
1.7 markus 1062: s->extended = 0;
1.1 markus 1063: s->chanid = -1;
1064: s->ptyfd = -1;
1065: s->ttyfd = -1;
1066: s->term = NULL;
1067: s->pw = NULL;
1068: s->display = NULL;
1069: s->screen = 0;
1070: s->auth_data = NULL;
1071: s->auth_proto = NULL;
1072: s->used = 1;
1.7 markus 1073: s->pw = NULL;
1.1 markus 1074: debug("session_new: session %d", i);
1075: return s;
1076: }
1077: }
1078: return NULL;
1079: }
1080:
1081: void
1082: session_dump(void)
1083: {
1084: int i;
1085: for(i = 0; i < MAX_SESSIONS; i++) {
1086: Session *s = &sessions[i];
1087: debug("dump: used %d session %d %p channel %d pid %d",
1088: s->used,
1089: s->self,
1090: s,
1091: s->chanid,
1092: s->pid);
1093: }
1094: }
1095:
1.2 markus 1096: int
1097: session_open(int chanid)
1098: {
1099: Session *s = session_new();
1100: debug("session_open: channel %d", chanid);
1101: if (s == NULL) {
1102: error("no more sessions");
1103: return 0;
1104: }
1.7 markus 1105: s->pw = auth_get_user();
1106: if (s->pw == NULL)
1107: fatal("no user for session %i", s->self);
1.2 markus 1108: debug("session_open: session %d: link with channel %d", s->self, chanid);
1109: s->chanid = chanid;
1110: return 1;
1111: }
1112:
1113: Session *
1114: session_by_channel(int id)
1115: {
1116: int i;
1117: for(i = 0; i < MAX_SESSIONS; i++) {
1118: Session *s = &sessions[i];
1119: if (s->used && s->chanid == id) {
1120: debug("session_by_channel: session %d channel %d", i, id);
1121: return s;
1122: }
1123: }
1124: debug("session_by_channel: unknown channel %d", id);
1125: session_dump();
1126: return NULL;
1127: }
1128:
1129: Session *
1130: session_by_pid(pid_t pid)
1131: {
1132: int i;
1133: debug("session_by_pid: pid %d", pid);
1134: for(i = 0; i < MAX_SESSIONS; i++) {
1135: Session *s = &sessions[i];
1136: if (s->used && s->pid == pid)
1137: return s;
1138: }
1139: error("session_by_pid: unknown pid %d", pid);
1140: session_dump();
1141: return NULL;
1142: }
1143:
1144: int
1145: session_window_change_req(Session *s)
1146: {
1147: s->col = packet_get_int();
1148: s->row = packet_get_int();
1149: s->xpixel = packet_get_int();
1150: s->ypixel = packet_get_int();
1.3 markus 1151: packet_done();
1.2 markus 1152: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1153: return 1;
1154: }
1155:
1156: int
1157: session_pty_req(Session *s)
1158: {
1159: unsigned int len;
1.3 markus 1160: char *term_modes; /* encoded terminal modes */
1.2 markus 1161:
1162: if (s->ttyfd != -1)
1.3 markus 1163: return 0;
1.2 markus 1164: s->term = packet_get_string(&len);
1165: s->col = packet_get_int();
1166: s->row = packet_get_int();
1167: s->xpixel = packet_get_int();
1168: s->ypixel = packet_get_int();
1.3 markus 1169: term_modes = packet_get_string(&len);
1170: packet_done();
1.2 markus 1171:
1172: if (strcmp(s->term, "") == 0) {
1173: xfree(s->term);
1174: s->term = NULL;
1175: }
1176: /* Allocate a pty and open it. */
1177: if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1178: xfree(s->term);
1179: s->term = NULL;
1180: s->ptyfd = -1;
1181: s->ttyfd = -1;
1182: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1183: xfree(term_modes);
1184: return 0;
1.2 markus 1185: }
1186: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1187: /*
1188: * Add a cleanup function to clear the utmp entry and record logout
1189: * time in case we call fatal() (e.g., the connection gets closed).
1190: */
1191: fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1192: pty_setowner(s->pw, s->tty);
1193: /* Get window size from the packet. */
1194: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1195:
1.9 markus 1196: session_proctitle(s);
1197:
1.3 markus 1198: /* XXX parse and set terminal modes */
1199: xfree(term_modes);
1.2 markus 1200: return 1;
1201: }
1202:
1.7 markus 1203: int
1204: session_subsystem_req(Session *s)
1205: {
1206: unsigned int len;
1207: int success = 0;
1208: char *subsys = packet_get_string(&len);
1209:
1210: packet_done();
1211: log("subsystem request for %s", subsys);
1212:
1213: xfree(subsys);
1214: return success;
1215: }
1216:
1217: int
1218: session_x11_req(Session *s)
1219: {
1220: if (!options.x11_forwarding) {
1221: debug("X11 forwarding disabled in server configuration file.");
1222: return 0;
1223: }
1224: if (xauthfile != NULL) {
1225: debug("X11 fwd already started.");
1226: return 0;
1227: }
1228:
1229: debug("Received request for X11 forwarding with auth spoofing.");
1230: if (s->display != NULL)
1231: packet_disconnect("Protocol error: X11 display already set.");
1232:
1233: s->single_connection = packet_get_char();
1234: s->auth_proto = packet_get_string(NULL);
1235: s->auth_data = packet_get_string(NULL);
1236: s->screen = packet_get_int();
1237: packet_done();
1238:
1239: s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1240: if (s->display == NULL) {
1241: xfree(s->auth_proto);
1242: xfree(s->auth_data);
1243: return 0;
1244: }
1245: xauthfile = xmalloc(MAXPATHLEN);
1246: strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1247: temporarily_use_uid(s->pw->pw_uid);
1248: if (mkdtemp(xauthfile) == NULL) {
1249: restore_uid();
1250: error("private X11 dir: mkdtemp %s failed: %s",
1251: xauthfile, strerror(errno));
1252: xfree(xauthfile);
1253: xauthfile = NULL;
1254: xfree(s->auth_proto);
1255: xfree(s->auth_data);
1256: /* XXXX remove listening channels */
1257: return 0;
1258: }
1259: strlcat(xauthfile, "/cookies", MAXPATHLEN);
1260: open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1261: restore_uid();
1262: fatal_add_cleanup(xauthfile_cleanup_proc, s);
1263: return 1;
1264: }
1265:
1.2 markus 1266: void
1267: session_input_channel_req(int id, void *arg)
1268: {
1269: unsigned int len;
1270: int reply;
1271: int success = 0;
1272: char *rtype;
1273: Session *s;
1274: Channel *c;
1275:
1276: rtype = packet_get_string(&len);
1277: reply = packet_get_char();
1278:
1279: s = session_by_channel(id);
1280: if (s == NULL)
1281: fatal("session_input_channel_req: channel %d: no session", id);
1282: c = channel_lookup(id);
1283: if (c == NULL)
1284: fatal("session_input_channel_req: channel %d: bad channel", id);
1285:
1286: debug("session_input_channel_req: session %d channel %d request %s reply %d",
1287: s->self, id, rtype, reply);
1288:
1289: /*
1290: * a session is in LARVAL state until a shell
1291: * or programm is executed
1292: */
1293: if (c->type == SSH_CHANNEL_LARVAL) {
1294: if (strcmp(rtype, "shell") == 0) {
1.3 markus 1295: packet_done();
1.7 markus 1296: s->extended = 1;
1.2 markus 1297: if (s->ttyfd == -1)
1298: do_exec_no_pty(s, NULL, s->pw);
1299: else
1300: do_exec_pty(s, NULL, s->pw);
1301: success = 1;
1302: } else if (strcmp(rtype, "exec") == 0) {
1303: char *command = packet_get_string(&len);
1.3 markus 1304: packet_done();
1.7 markus 1305: s->extended = 1;
1.2 markus 1306: if (s->ttyfd == -1)
1307: do_exec_no_pty(s, command, s->pw);
1308: else
1309: do_exec_pty(s, command, s->pw);
1310: xfree(command);
1311: success = 1;
1312: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1313: success = session_pty_req(s);
1.7 markus 1314: } else if (strcmp(rtype, "x11-req") == 0) {
1315: success = session_x11_req(s);
1316: } else if (strcmp(rtype, "subsystem") == 0) {
1317: success = session_subsystem_req(s);
1.2 markus 1318: }
1319: }
1320: if (strcmp(rtype, "window-change") == 0) {
1321: success = session_window_change_req(s);
1322: }
1323:
1324: if (reply) {
1325: packet_start(success ?
1326: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1327: packet_put_int(c->remote_id);
1328: packet_send();
1329: }
1330: xfree(rtype);
1331: }
1332:
1333: void
1334: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1335: {
1336: if (!compat20)
1337: fatal("session_set_fds: called for proto != 2.0");
1338: /*
1339: * now that have a child and a pipe to the child,
1340: * we can activate our channel and register the fd's
1341: */
1342: if (s->chanid == -1)
1343: fatal("no channel for session %d", s->self);
1344: channel_set_fds(s->chanid,
1345: fdout, fdin, fderr,
1346: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ);
1347: }
1348:
1.1 markus 1349: void
1350: session_pty_cleanup(Session *s)
1351: {
1352: if (s == NULL || s->ttyfd == -1)
1353: return;
1354:
1355: debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1356:
1357: /* Cancel the cleanup function. */
1358: fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1359:
1360: /* Record that the user has logged out. */
1361: record_logout(s->pid, s->tty);
1362:
1363: /* Release the pseudo-tty. */
1364: pty_release(s->tty);
1365:
1366: /*
1367: * Close the server side of the socket pairs. We must do this after
1368: * the pty cleanup, so that another process doesn't get this pty
1369: * while we're still cleaning up.
1370: */
1371: if (close(s->ptymaster) < 0)
1372: error("close(s->ptymaster): %s", strerror(errno));
1.2 markus 1373: }
1374:
1375: void
1376: session_exit_message(Session *s, int status)
1377: {
1378: Channel *c;
1379: if (s == NULL)
1380: fatal("session_close: no session");
1381: c = channel_lookup(s->chanid);
1382: if (c == NULL)
1383: fatal("session_close: session %d: no channel %d",
1384: s->self, s->chanid);
1385: debug("session_exit_message: session %d channel %d pid %d",
1386: s->self, s->chanid, s->pid);
1387:
1388: if (WIFEXITED(status)) {
1389: channel_request_start(s->chanid,
1390: "exit-status", 0);
1391: packet_put_int(WEXITSTATUS(status));
1392: packet_send();
1393: } else if (WIFSIGNALED(status)) {
1394: channel_request_start(s->chanid,
1395: "exit-signal", 0);
1396: packet_put_int(WTERMSIG(status));
1397: packet_put_char(WCOREDUMP(status));
1398: packet_put_cstring("");
1399: packet_put_cstring("");
1400: packet_send();
1401: } else {
1402: /* Some weird exit cause. Just exit. */
1403: packet_disconnect("wait returned status %04x.", status);
1404: }
1405:
1406: /* disconnect channel */
1407: debug("session_exit_message: release channel %d", s->chanid);
1408: channel_cancel_cleanup(s->chanid);
1.5 markus 1409: /*
1410: * emulate a write failure with 'chan_write_failed', nobody will be
1411: * interested in data we write.
1412: * Note that we must not call 'chan_read_failed', since there could
1413: * be some more data waiting in the pipe.
1414: */
1.8 markus 1415: if (c->ostate != CHAN_OUTPUT_CLOSED)
1416: chan_write_failed(c);
1.2 markus 1417: s->chanid = -1;
1418: }
1419:
1420: void
1421: session_free(Session *s)
1422: {
1423: debug("session_free: session %d pid %d", s->self, s->pid);
1424: if (s->term)
1425: xfree(s->term);
1426: if (s->display)
1427: xfree(s->display);
1428: if (s->auth_data)
1429: xfree(s->auth_data);
1430: if (s->auth_proto)
1431: xfree(s->auth_proto);
1432: s->used = 0;
1433: }
1434:
1435: void
1436: session_close(Session *s)
1437: {
1438: session_pty_cleanup(s);
1439: session_free(s);
1.9 markus 1440: session_proctitle(s);
1.2 markus 1441: }
1442:
1443: void
1444: session_close_by_pid(pid_t pid, int status)
1445: {
1446: Session *s = session_by_pid(pid);
1447: if (s == NULL) {
1448: debug("session_close_by_pid: no session for pid %d", s->pid);
1449: return;
1450: }
1451: if (s->chanid != -1)
1452: session_exit_message(s, status);
1453: session_close(s);
1454: }
1455:
1456: /*
1457: * this is called when a channel dies before
1458: * the session 'child' itself dies
1459: */
1460: void
1461: session_close_by_channel(int id, void *arg)
1462: {
1463: Session *s = session_by_channel(id);
1464: if (s == NULL) {
1465: debug("session_close_by_channel: no session for channel %d", id);
1466: return;
1467: }
1468: /* disconnect channel */
1469: channel_cancel_cleanup(s->chanid);
1470: s->chanid = -1;
1471:
1472: debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1473: if (s->pid == 0) {
1474: /* close session immediately */
1475: session_close(s);
1476: } else {
1477: /* notify child, delay session cleanup */
1478: if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1479: error("session_close_by_channel: kill %d: %s",
1480: s->pid, strerror(errno));
1481: }
1.9 markus 1482: }
1483:
1484: char *
1485: session_tty_list(void)
1486: {
1487: static char buf[1024];
1488: int i;
1489: buf[0] = '\0';
1490: for(i = 0; i < MAX_SESSIONS; i++) {
1491: Session *s = &sessions[i];
1492: if (s->used && s->ttyfd != -1) {
1493: if (buf[0] != '\0')
1494: strlcat(buf, ",", sizeof buf);
1495: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1496: }
1497: }
1498: if (buf[0] == '\0')
1499: strlcpy(buf, "notty", sizeof buf);
1500: return buf;
1501: }
1502:
1503: void
1504: session_proctitle(Session *s)
1505: {
1506: if (s->pw == NULL)
1507: error("no user for session %d", s->self);
1508: else
1509: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.2 markus 1510: }
1511:
1512: void
1513: do_authenticated2(void)
1514: {
1515: /*
1516: * Cancel the alarm we set to limit the time taken for
1517: * authentication.
1518: */
1519: alarm(0);
1520: server_loop2();
1.7 markus 1521: if (xauthfile)
1522: xauthfile_cleanup_proc(NULL);
1.1 markus 1523: }