Annotation of src/usr.bin/ssh/ssh.h, Revision 1.2
1.1 deraadt 1: /*
2:
3: ssh.h
4:
5: Author: Tatu Ylonen <ylo@cs.hut.fi>
6:
7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: All rights reserved
9:
10: Created: Fri Mar 17 17:09:37 1995 ylo
11:
12: Generic header file for ssh.
13:
14: */
15:
1.2 ! deraadt 16: /* RCSID("$Id: ssh.h,v 1.1 1999/09/26 20:53:38 deraadt Exp $"); */
1.1 deraadt 17:
18: #ifndef SSH_H
19: #define SSH_H
20:
21: #include <gmp.h>
22: #include "rsa.h"
23: #include "randoms.h"
24: #include "cipher.h"
25:
26: /* The default cipher used if IDEA is not supported by the remote host.
27: It is recommended that this be one of the mandatory ciphers (DES, 3DES),
28: though that is not required. */
29: #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES
30:
31: /* Cipher used for encrypting authentication files. */
32: #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
33:
34: /* Default port number. */
35: #define SSH_DEFAULT_PORT 22
36:
37: /* Maximum number of TCP/IP ports forwarded per direction. */
38: #define SSH_MAX_FORWARDS_PER_DIRECTION 100
39:
40: /* Maximum number of RSA authentication identity files that can be specified
41: in configuration files or on the command line. */
42: #define SSH_MAX_IDENTITY_FILES 100
43:
44: /* Major protocol version. Different version indicates major incompatiblity
45: that prevents communication. */
46: #define PROTOCOL_MAJOR 1
47:
48: /* Minor protocol version. Different version indicates minor incompatibility
49: that does not prevent interoperation. */
50: #define PROTOCOL_MINOR 3
51:
52: /* Name for the service. The port named by this service overrides the default
53: port if present. */
54: #define SSH_SERVICE_NAME "ssh"
55:
1.2 ! deraadt 56: #define ETCDIR "/etc"
! 57: #define PIDDIR "/var/run"
! 58:
1.1 deraadt 59: /* System-wide file containing host keys of known hosts. This file should be
60: world-readable. */
61: #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
62:
63: /* HOST_KEY_FILE /etc/ssh_host_key,
64: SERVER_CONFIG_FILE /etc/sshd_config,
65: and HOST_CONFIG_FILE /etc/ssh_config
66: are all defined in Makefile.in. Of these, ssh_host_key should be readable
67: only by root, whereas ssh_config should be world-readable. */
1.2 ! deraadt 68:
! 69: #define HOST_KEY_FILE "/etc/ssh_host_key"
! 70: #define SERVER_CONFIG_FILE "/etc/sshd_config"
! 71: #define HOST_CONFIG_FILE "/etc/ssh_config"
! 72:
! 73: #define SSH_PROGRAM "/usr/bin/ssh"
1.1 deraadt 74:
75: /* Random seed file for the daemon. This file should be readable only by
76: root. */
77: #define SSH_DAEMON_SEED_FILE ETCDIR "/ssh_random_seed"
78:
79: /* The process id of the daemon listening for connections is saved
80: here to make it easier to kill the correct daemon when necessary. */
81: #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
82:
83: /* The directory in user\'s home directory in which the files reside.
84: The directory should be world-readable (though not all files are). */
85: #define SSH_USER_DIR ".ssh"
86:
87: /* Per-user file containing host keys of known hosts. This file need
88: not be readable by anyone except the user him/herself, though this does
89: not contain anything particularly secret. */
90: #define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
91:
92: /* Name of the file containing client-side random seed. This file should
93: only be readable by the user him/herself. */
94: #define SSH_CLIENT_SEEDFILE ".ssh/random_seed"
95:
96: /* Name of the default file containing client-side authentication key.
97: This file should only be readable by the user him/herself. */
98: #define SSH_CLIENT_IDENTITY ".ssh/identity"
99:
100: /* Configuration file in user\'s home directory. This file need not be
101: readable by anyone but the user him/herself, but does not contain
102: anything particularly secret. If the user\'s home directory resides
103: on an NFS volume where root is mapped to nobody, this may need to be
104: world-readable. */
105: #define SSH_USER_CONFFILE ".ssh/config"
106:
107: /* File containing a list of those rsa keys that permit logging in as
108: this user. This file need not be
109: readable by anyone but the user him/herself, but does not contain
110: anything particularly secret. If the user\'s home directory resides
111: on an NFS volume where root is mapped to nobody, this may need to be
112: world-readable. (This file is read by the daemon which is running as
113: root.) */
114: #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
115:
116: /* Per-user and system-wide ssh "rc" files. These files are executed with
117: /bin/sh before starting the shell or command if they exist. They
118: will be passed "proto cookie" as arguments if X11 forwarding with
119: spoofing is in use. xauth will be run if neither of these exists. */
120: #define SSH_USER_RC ".ssh/rc"
121: #define SSH_SYSTEM_RC ETCDIR "/sshrc"
122:
123: /* Ssh-only version of /etc/hosts.equiv. */
124: #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
125:
126: /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
127: rhosts authentication is enabled. */
128:
129: /* Socket for connecting the authentication agent. Normally the connection
130: to the authentication agent is passed in a file descriptor; however,
131: on some systems, commonly used shells close all open file descriptors.
132: To make the agent usable on those systems, configure checks whether
133: the shells close all descriptors, and if so, defines AGENT_USES_SOCKET.
134: That socket is an unix-domain socket and will be stored with this name
135: in the user\'s home directory. The socket must not be accessible by
136: anyone but the user him/herself. The number at the end of the name
137: is the pid of the agent or the forwarding daemon. Note that this
138: socket is stored in /tmp, which is supposedly on the local machine. If
139: this were in the user\'s home directory, the daemon (running as root)
140: might not be able to create and chown the file to the user\'s uid. */
141: #define SSH_AGENT_SOCKET "/tmp/ssh_agent.%d"
142:
143: /* Name of the environment variable containing the authentication fd. */
144: #define SSH_AUTHFD_ENV_NAME "SSH_AUTHENTICATION_FD"
145:
146: /* Name of the environment variable containing the pathname of the
147: authentication socket. */
148: #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTHENTICATION_SOCKET"
149:
150: /* Force host key length and server key length to differ by at least this
151: many bits. This is to make double encryption with rsaref work. */
152: #define SSH_KEY_BITS_RESERVED 128
153:
154: /* Length of the session key in bytes. (Specified as 256 bits in the
155: protocol.) */
156: #define SSH_SESSION_KEY_LENGTH 32
157:
158: /* Name of Kerberos service for SSH to use. */
159: #define KRB4_SERVICE_NAME "rcmd"
160:
161: /* Authentication methods. New types can be added, but old types should not
162: be removed for compatibility. The maximum allowed value is 31. */
163: #define SSH_AUTH_RHOSTS 1
164: #define SSH_AUTH_RSA 2
165: #define SSH_AUTH_PASSWORD 3
166: #define SSH_AUTH_RHOSTS_RSA 4
167: /* 5 is TIS */
168: #define SSH_AUTH_KERBEROS 6
169: #define SSH_PASS_KERBEROS_TGT 7
170: #define SSH_PASS_AFS_TOKEN 21
171:
172: /* Protocol flags. These are bit masks. */
173: #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
174: #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
175:
176: /* Definition of message types. New values can be added, but old values
177: should not be removed or without careful consideration of the consequences
178: for compatibility. The maximum value is 254; value 255 is reserved
179: for future extension. */
180: /* Message name */ /* msg code */ /* arguments */
181: #define SSH_MSG_NONE 0 /* no message */
182: #define SSH_MSG_DISCONNECT 1 /* cause (string) */
183: #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
184: #define SSH_CMSG_SESSION_KEY 3 /* key (MP_INT) */
185: #define SSH_CMSG_USER 4 /* user (string) */
186: #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
187: #define SSH_CMSG_AUTH_RSA 6 /* modulus (MP_INT) */
188: #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (MP_INT) */
189: #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (MP_INT) */
190: #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
191: #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
192: #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
193: #define SSH_CMSG_EXEC_SHELL 12 /* */
194: #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
195: #define SSH_SMSG_SUCCESS 14 /* */
196: #define SSH_SMSG_FAILURE 15 /* */
197: #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
198: #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
199: #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
200: #define SSH_CMSG_EOF 19 /* */
201: #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
202: #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
203: #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
204: #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
205: #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
206: #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
207: /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
208: #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
209: #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
210: #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
211: #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
212: #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
213: #define SSH_MSG_IGNORE 32 /* string */
214: #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
215: #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
216: #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
217: #define SSH_MSG_DEBUG 36 /* string */
218: #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
219:
220: #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
221: #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
222: #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
223: #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
224:
225:
226: /* Includes that need definitions above. */
227:
228: #include "readconf.h"
229:
230: /*------------ definitions for login.c -------------*/
231:
232: /* Returns the time when the user last logged in. Returns 0 if the
233: information is not available. This must be called before record_login.
234: The host from which the user logged in is stored in buf. */
235: unsigned long get_last_login_time(uid_t uid, const char *logname,
236: char *buf, unsigned int bufsize);
237:
238: /* Records that the user has logged in. This does many things normally
239: done by login(1). */
240: void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
241: const char *host, struct sockaddr_in *addr);
242:
243: /* Records that the user has logged out. This does many thigs normally
244: done by login(1) or init. */
245: void record_logout(int pid, const char *ttyname);
246:
247: /*------------ definitions for sshconnect.c ----------*/
248:
249: /* Opens a TCP/IP connection to the remote server on the given host. If
250: port is 0, the default port will be used. If anonymous is zero,
251: a privileged port will be allocated to make the connection.
252: This requires super-user privileges if anonymous is false.
253: Connection_attempts specifies the maximum number of tries, one per
254: second. This returns true on success, and zero on failure. If the
255: connection is successful, this calls packet_set_connection for the
256: connection. */
257: int ssh_connect(const char *host, int port, int connection_attempts,
258: int anonymous, uid_t original_real_uid,
259: const char *proxy_command, RandomState *random_state);
260:
261: /* Starts a dialog with the server, and authenticates the current user on the
262: server. This does not need any extra privileges. The basic connection
263: to the server must already have been established before this is called.
264: If login fails, this function prints an error and never returns.
265: This initializes the random state, and leaves it initialized (it will also
266: have references from the packet module). */
267: void ssh_login(RandomState *state, int host_key_valid, RSAPrivateKey *host_key,
268: const char *host, Options *options, uid_t original_real_uid);
269:
270: /*------------ Definitions for various authentication methods. -------*/
271:
272: /* Tries to authenticate the user using the .rhosts file. Returns true if
273: authentication succeeds. If ignore_rhosts is non-zero, this will not
274: consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
275: If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
276: int auth_rhosts(struct passwd *pw, const char *client_user,
277: int ignore_rhosts, int strict_modes);
278:
279: /* Tries to authenticate the user using the .rhosts file and the host using
280: its host key. Returns true if authentication succeeds. */
281: int auth_rhosts_rsa(RandomState *state,
282: struct passwd *pw, const char *client_user,
283: unsigned int bits, MP_INT *client_host_key_e,
284: MP_INT *client_host_key_n, int ignore_rhosts,
285: int strict_modes);
286:
287: /* Tries to authenticate the user using password. Returns true if
288: authentication succeeds. */
289: int auth_password(const char *server_user, const char *password);
290:
291: /* Performs the RSA authentication dialog with the client. This returns
292: 0 if the client could not be authenticated, and 1 if authentication was
293: successful. This may exit if there is a serious protocol violation. */
294: int auth_rsa(struct passwd *pw, MP_INT *client_n, RandomState *state);
295:
296: /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
297: over the key. Skips any whitespace at the beginning and at end. */
298: int auth_rsa_read_key(char **cpp, unsigned int *bitsp, MP_INT *e, MP_INT *n);
299:
300: /* Returns the name of the machine at the other end of the socket. The
301: returned string should be freed by the caller. */
302: char *get_remote_hostname(int socket);
303:
304: /* Return the canonical name of the host in the other side of the current
305: connection (as returned by packet_get_connection). The host name is
306: cached, so it is efficient to call this several times. */
307: const char *get_canonical_hostname(void);
308:
309: /* Returns the remote IP address as an ascii string. The value need not be
310: freed by the caller. */
311: const char *get_remote_ipaddr(void);
312:
313: /* Returns the port number of the peer of the socket. */
314: int get_peer_port(int sock);
315:
316: /* Returns the port number of the remote host. */
317: int get_remote_port(void);
318:
319: /* Tries to match the host name (which must be in all lowercase) against the
320: comma-separated sequence of subpatterns (each possibly preceded by ! to
321: indicate negation). Returns true if there is a positive match; zero
322: otherwise. */
323: int match_hostname(const char *host, const char *pattern, unsigned int len);
324:
325: /* Checks whether the given host is already in the list of our known hosts.
326: Returns HOST_OK if the host is known and has the specified key,
327: HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
328: but used to have a different host key. The host must be in all lowercase. */
329: typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus;
330: HostStatus check_host_in_hostfile(const char *filename,
331: const char *host, unsigned int bits,
332: MP_INT *e, MP_INT *n);
333:
334: /* Appends an entry to the host file. Returns false if the entry
335: could not be appended. */
336: int add_host_to_hostfile(const char *filename, const char *host,
337: unsigned int bits, MP_INT *e, MP_INT *n);
338:
339: /* Performs the RSA authentication challenge-response dialog with the client,
340: and returns true (non-zero) if the client gave the correct answer to
341: our challenge; returns zero if the client gives a wrong answer. */
342: int auth_rsa_challenge_dialog(RandomState *state, unsigned int bits,
343: MP_INT *e, MP_INT *n);
344:
345: /* Reads a passphrase from /dev/tty with echo turned off. Returns the
346: passphrase (allocated with xmalloc). Exits if EOF is encountered.
347: If from_stdin is true, the passphrase will be read from stdin instead. */
348: char *read_passphrase(const char *prompt, int from_stdin);
349:
350: /* Saves the authentication (private) key in a file, encrypting it with
351: passphrase. The identification of the file (lowest 64 bits of n)
352: will precede the key to provide identification of the key without
353: needing a passphrase. */
354: int save_private_key(const char *filename, const char *passphrase,
355: RSAPrivateKey *private_key, const char *comment,
356: RandomState *state);
357:
358: /* Loads the public part of the key file (public key and comment).
359: Returns 0 if an error occurred; zero if the public key was successfully
360: read. The comment of the key is returned in comment_return if it is
361: non-NULL; the caller must free the value with xfree. */
362: int load_public_key(const char *filename, RSAPublicKey *pub,
363: char **comment_return);
364:
365: /* Loads the private key from the file. Returns 0 if an error is encountered
366: (file does not exist or is not readable, or passphrase is bad).
367: This initializes the private key. The comment of the key is returned
368: in comment_return if it is non-NULL; the caller must free the value
369: with xfree. */
370: int load_private_key(const char *filename, const char *passphrase,
371: RSAPrivateKey *private_key, char **comment_return);
372:
373: /*------------ Definitions for logging. -----------------------*/
374:
375: /* Supported syslog facilities. */
376: typedef enum
377: {
378: SYSLOG_FACILITY_DAEMON,
379: SYSLOG_FACILITY_USER,
380: SYSLOG_FACILITY_AUTH,
381: SYSLOG_FACILITY_LOCAL0,
382: SYSLOG_FACILITY_LOCAL1,
383: SYSLOG_FACILITY_LOCAL2,
384: SYSLOG_FACILITY_LOCAL3,
385: SYSLOG_FACILITY_LOCAL4,
386: SYSLOG_FACILITY_LOCAL5,
387: SYSLOG_FACILITY_LOCAL6,
388: SYSLOG_FACILITY_LOCAL7
389: } SyslogFacility;
390:
391: /* Initializes logging. If debug is non-zero, debug() will output something.
392: If quiet is non-zero, none of these will log send anything to syslog
393: (but maybe to stderr). */
394: void log_init(char *av0, int on_stderr, int debug, int quiet,
395: SyslogFacility facility);
396:
397: /* Outputs a message to syslog or stderr, depending on the implementation.
398: The format must guarantee that the final message does not exceed 1024
399: characters. The message should not contain newline. */
400: void log(const char *fmt, ...);
401:
402: /* Outputs a message to syslog or stderr, depending on the implementation.
403: The format must guarantee that the final message does not exceed 1024
404: characters. The message should not contain newline. */
405: void debug(const char *fmt, ...);
406:
407: /* Outputs a message to syslog or stderr, depending on the implementation.
408: The format must guarantee that the final message does not exceed 1024
409: characters. The message should not contain newline. */
410: void error(const char *fmt, ...);
411:
412: /* Outputs a message to syslog or stderr, depending on the implementation.
413: The format must guarantee that the final message does not exceed 1024
414: characters. The message should not contain newline.
415: This call never returns. */
416: void fatal(const char *fmt, ...);
417:
418: /* Registers a cleanup function to be called by fatal() before exiting.
419: It is permissible to call fatal_remove_cleanup for the function itself
420: from the function. */
421: void fatal_add_cleanup(void (*proc)(void *context), void *context);
422:
423: /* Removes a cleanup frunction to be called at fatal(). */
424: void fatal_remove_cleanup(void (*proc)(void *context), void *context);
425:
426: /*---------------- definitions for x11.c ------------------*/
427:
428:
429: /* Sets specific protocol options. */
430: void channel_set_options(int hostname_in_open);
431:
432: /* Allocate a new channel object and set its type and socket. Remote_name
433: must have been allocated with xmalloc; this will free it when the channel
434: is freed. */
435: int channel_allocate(int type, int sock, char *remote_name);
436:
437: /* Free the channel and close its socket. */
438: void channel_free(int channel);
439:
440: /* Add any bits relevant to channels in select bitmasks. */
441: void channel_prepare_select(fd_set *readset, fd_set *writeset);
442:
443: /* After select, perform any appropriate operations for channels which
444: have events pending. */
445: void channel_after_select(fd_set *readset, fd_set *writeset);
446:
447: /* If there is data to send to the connection, send some of it now. */
448: void channel_output_poll(void);
449:
450: /* This is called when a packet of type CHANNEL_DATA has just been received.
451: The message type has already been consumed, but channel number and data
452: is still there. */
453: void channel_input_data(int payload_len);
454:
455: /* Returns true if no channel has too much buffered data. */
456: int channel_not_very_much_buffered_data(void);
457:
458: /* This is called after receiving CHANNEL_CLOSE. */
459: void channel_input_close(void);
460:
461: /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
462: void channel_input_close_confirmation(void);
463:
464: /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
465: void channel_input_open_confirmation(void);
466:
467: /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
468: void channel_input_open_failure(void);
469:
470: /* This closes any sockets that are listening for connections; this removes
471: any unix domain sockets. */
472: void channel_stop_listening(void);
473:
474: /* Closes the sockets of all channels. This is used to close extra file
475: descriptors after a fork. */
476: void channel_close_all(void);
477:
478: /* Returns the maximum file descriptor number used by the channels. */
479: int channel_max_fd(void);
480:
481: /* Returns true if there is still an open channel over the connection. */
482: int channel_still_open(void);
483:
484: /* Returns a string containing a list of all open channels. The list is
485: suitable for displaying to the user. It uses crlf instead of newlines.
486: The caller should free the string with xfree. */
487: char *channel_open_message(void);
488:
489: /* Initiate forwarding of connections to local port "port" through the secure
490: channel to host:port from remote side. This never returns if there
491: was an error. */
492: void channel_request_local_forwarding(int port, const char *host,
493: int remote_port);
494:
495: /* Initiate forwarding of connections to port "port" on remote host through
496: the secure channel to host:port from local side. This never returns
497: if there was an error. This registers that open requests for that
498: port are permitted. */
499: void channel_request_remote_forwarding(int port, const char *host,
500: int remote_port);
501:
502: /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
503: called by the server, because the user could connect to any port anyway,
504: and the server has no way to know but to trust the client anyway. */
505: void channel_permit_all_opens(void);
506:
507: /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
508: listening for the port, and sends back a success reply (or disconnect
509: message if there was an error). This never returns if there was an
510: error. */
511: void channel_input_port_forward_request(int is_root);
512:
513: /* This is called after receiving PORT_OPEN message. This attempts to connect
514: to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
515: CHANNEL_OPEN_FAILURE. */
516: void channel_input_port_open(int payload_len);
517:
518: /* Creates a port for X11 connections, and starts listening for it.
519: Returns the display name, or NULL if an error was encountered. */
520: char *x11_create_display(int screen);
521:
522: /* Creates an internet domain socket for listening for X11 connections.
523: Returns a suitable value for the DISPLAY variable, or NULL if an error
524: occurs. */
525: char *x11_create_display_inet(int screen);
526:
527: /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
528: the remote channel number. We should do whatever we want, and respond
529: with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
530: void x11_input_open(int payload_len);
531:
532: /* Requests forwarding of X11 connections. This should be called on the
533: client only. */
534: void x11_request_forwarding(void);
535:
536: /* Requests forwarding for X11 connections, with authentication spoofing.
537: This should be called in the client only. */
538: void x11_request_forwarding_with_spoofing(RandomState *state,
539: const char *proto, const char *data);
540:
541: /* Local Xauthority file (server only). */
542: extern char *xauthfile;
543:
544: /* Sends a message to the server to request authentication fd forwarding. */
545: void auth_request_forwarding(void);
546:
547: /* Returns the number of the file descriptor to pass to child programs as
548: the authentication fd. */
549: int auth_get_fd(void);
550:
551: /* Returns the name of the forwarded authentication socket. Returns NULL
552: if there is no forwarded authentication socket. The returned value points
553: to a static buffer. */
554: char *auth_get_socket_name(void);
555:
556: /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
557: This starts forwarding authentication requests. */
558: void auth_input_request_forwarding(struct passwd *pw);
559:
560: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
561: void auth_input_open_request(void);
562:
563: /* Returns true if the given string matches the pattern (which may contain
564: ? and * as wildcards), and zero if it does not match. */
565: int match_pattern(const char *s, const char *pattern);
566:
567: /* Expands tildes in the file name. Returns data allocated by xmalloc.
568: Warning: this calls getpw*. */
569: char *tilde_expand_filename(const char *filename, uid_t my_uid);
570:
571: /* Gets a file descriptor that won't get closed by shell pathname.
572: If pathname is NULL, the path is inferred from the SHELL environment
573: variable or the user id. */
574: int get_permanent_fd(const char *pathname);
575:
576: /* Performs the interactive session. This handles data transmission between
577: the client and the program. Note that the notion of stdin, stdout, and
578: stderr in this function is sort of reversed: this function writes to
579: stdin (of the child program), and reads from stdout and stderr (of the
580: child program). */
581: void server_loop(int pid, int fdin, int fdout, int fderr);
582:
583: /* Client side main loop for the interactive session. */
584: int client_loop(int have_pty, int escape_char);
585:
586: /* Linked list of custom environment strings (see auth-rsa.c). */
587: struct envstring {
588: struct envstring *next;
589: char *s;
590: };
591:
592: #ifdef KRB4
593: #include <krb.h>
594:
595: int ssh_tf_init(uid_t uid);
596: int auth_krb4(const char *server_user, KTEXT auth, char **client);
597: int auth_kerberos_tgt(struct passwd *pw, const char *string);
598: int auth_afs_token(char *server_user, uid_t uid, const char *string);
599:
600: int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
601: int radix_to_creds(const char *buf, CREDENTIALS *creds);
602:
603: #endif /* KRB4 */
604:
605: #endif /* SSH_H */
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