Annotation of src/usr.bin/ssh/ssh.h, Revision 1.6
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:
1.6 ! provos 16: /* RCSID("$Id: ssh.h,v 1.5 1999/10/01 02:38:10 provos Exp $"); */
1.1 deraadt 17:
18: #ifndef SSH_H
19: #define SSH_H
20:
21: #include "rsa.h"
22: #include "cipher.h"
23:
24: /* The default cipher used if IDEA is not supported by the remote host.
25: It is recommended that this be one of the mandatory ciphers (DES, 3DES),
26: though that is not required. */
27: #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES
28:
29: /* Cipher used for encrypting authentication files. */
30: #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
31:
32: /* Default port number. */
33: #define SSH_DEFAULT_PORT 22
34:
35: /* Maximum number of TCP/IP ports forwarded per direction. */
36: #define SSH_MAX_FORWARDS_PER_DIRECTION 100
37:
38: /* Maximum number of RSA authentication identity files that can be specified
39: in configuration files or on the command line. */
40: #define SSH_MAX_IDENTITY_FILES 100
41:
42: /* Major protocol version. Different version indicates major incompatiblity
43: that prevents communication. */
44: #define PROTOCOL_MAJOR 1
45:
46: /* Minor protocol version. Different version indicates minor incompatibility
47: that does not prevent interoperation. */
48: #define PROTOCOL_MINOR 3
49:
50: /* Name for the service. The port named by this service overrides the default
51: port if present. */
52: #define SSH_SERVICE_NAME "ssh"
53:
1.2 deraadt 54: #define ETCDIR "/etc"
55: #define PIDDIR "/var/run"
56:
1.1 deraadt 57: /* System-wide file containing host keys of known hosts. This file should be
58: world-readable. */
59: #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
60:
61: /* HOST_KEY_FILE /etc/ssh_host_key,
62: SERVER_CONFIG_FILE /etc/sshd_config,
63: and HOST_CONFIG_FILE /etc/ssh_config
64: are all defined in Makefile.in. Of these, ssh_host_key should be readable
65: only by root, whereas ssh_config should be world-readable. */
1.2 deraadt 66:
67: #define HOST_KEY_FILE "/etc/ssh_host_key"
68: #define SERVER_CONFIG_FILE "/etc/sshd_config"
69: #define HOST_CONFIG_FILE "/etc/ssh_config"
70:
71: #define SSH_PROGRAM "/usr/bin/ssh"
1.1 deraadt 72:
73: /* The process id of the daemon listening for connections is saved
74: here to make it easier to kill the correct daemon when necessary. */
75: #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
76:
77: /* The directory in user\'s home directory in which the files reside.
78: The directory should be world-readable (though not all files are). */
79: #define SSH_USER_DIR ".ssh"
80:
81: /* Per-user file containing host keys of known hosts. This file need
82: not be readable by anyone except the user him/herself, though this does
83: not contain anything particularly secret. */
84: #define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
85:
86: /* Name of the default file containing client-side authentication key.
87: This file should only be readable by the user him/herself. */
88: #define SSH_CLIENT_IDENTITY ".ssh/identity"
89:
90: /* Configuration file in user\'s home directory. This file need not be
91: readable by anyone but the user him/herself, but does not contain
92: anything particularly secret. If the user\'s home directory resides
93: on an NFS volume where root is mapped to nobody, this may need to be
94: world-readable. */
95: #define SSH_USER_CONFFILE ".ssh/config"
96:
97: /* File containing a list of those rsa keys that permit logging in as
98: this user. This file need not be
99: readable by anyone but the user him/herself, but does not contain
100: anything particularly secret. If the user\'s home directory resides
101: on an NFS volume where root is mapped to nobody, this may need to be
102: world-readable. (This file is read by the daemon which is running as
103: root.) */
104: #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
105:
106: /* Per-user and system-wide ssh "rc" files. These files are executed with
107: /bin/sh before starting the shell or command if they exist. They
108: will be passed "proto cookie" as arguments if X11 forwarding with
109: spoofing is in use. xauth will be run if neither of these exists. */
110: #define SSH_USER_RC ".ssh/rc"
111: #define SSH_SYSTEM_RC ETCDIR "/sshrc"
112:
113: /* Ssh-only version of /etc/hosts.equiv. */
114: #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
115:
116: /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
117: rhosts authentication is enabled. */
118:
119: /* Socket for connecting the authentication agent. Normally the connection
120: to the authentication agent is passed in a file descriptor; however,
121: on some systems, commonly used shells close all open file descriptors.
122: To make the agent usable on those systems, configure checks whether
123: the shells close all descriptors, and if so, defines AGENT_USES_SOCKET.
124: That socket is an unix-domain socket and will be stored with this name
125: in the user\'s home directory. The socket must not be accessible by
126: anyone but the user him/herself. The number at the end of the name
127: is the pid of the agent or the forwarding daemon. Note that this
128: socket is stored in /tmp, which is supposedly on the local machine. If
129: this were in the user\'s home directory, the daemon (running as root)
130: might not be able to create and chown the file to the user\'s uid. */
131: #define SSH_AGENT_SOCKET "/tmp/ssh_agent.%d"
132:
133: /* Name of the environment variable containing the authentication fd. */
134: #define SSH_AUTHFD_ENV_NAME "SSH_AUTHENTICATION_FD"
135:
136: /* Name of the environment variable containing the pathname of the
137: authentication socket. */
138: #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTHENTICATION_SOCKET"
139:
140: /* Force host key length and server key length to differ by at least this
141: many bits. This is to make double encryption with rsaref work. */
142: #define SSH_KEY_BITS_RESERVED 128
143:
144: /* Length of the session key in bytes. (Specified as 256 bits in the
145: protocol.) */
146: #define SSH_SESSION_KEY_LENGTH 32
147:
148: /* Name of Kerberos service for SSH to use. */
149: #define KRB4_SERVICE_NAME "rcmd"
150:
151: /* Authentication methods. New types can be added, but old types should not
152: be removed for compatibility. The maximum allowed value is 31. */
153: #define SSH_AUTH_RHOSTS 1
154: #define SSH_AUTH_RSA 2
155: #define SSH_AUTH_PASSWORD 3
156: #define SSH_AUTH_RHOSTS_RSA 4
157: /* 5 is TIS */
158: #define SSH_AUTH_KERBEROS 6
159: #define SSH_PASS_KERBEROS_TGT 7
160: #define SSH_PASS_AFS_TOKEN 21
161:
162: /* Protocol flags. These are bit masks. */
163: #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
164: #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
165:
166: /* Definition of message types. New values can be added, but old values
167: should not be removed or without careful consideration of the consequences
168: for compatibility. The maximum value is 254; value 255 is reserved
169: for future extension. */
170: /* Message name */ /* msg code */ /* arguments */
171: #define SSH_MSG_NONE 0 /* no message */
172: #define SSH_MSG_DISCONNECT 1 /* cause (string) */
173: #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
1.3 provos 174: #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
1.1 deraadt 175: #define SSH_CMSG_USER 4 /* user (string) */
176: #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
1.3 provos 177: #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
178: #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
179: #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
1.1 deraadt 180: #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
181: #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
182: #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
183: #define SSH_CMSG_EXEC_SHELL 12 /* */
184: #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
185: #define SSH_SMSG_SUCCESS 14 /* */
186: #define SSH_SMSG_FAILURE 15 /* */
187: #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
188: #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
189: #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
190: #define SSH_CMSG_EOF 19 /* */
191: #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
192: #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
193: #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
194: #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
195: #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
196: #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
197: /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
198: #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
199: #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
200: #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
201: #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
202: #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
203: #define SSH_MSG_IGNORE 32 /* string */
204: #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
205: #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
206: #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
207: #define SSH_MSG_DEBUG 36 /* string */
208: #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
209:
210: #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
211: #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
212: #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
213: #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
214:
215:
216: /* Includes that need definitions above. */
217:
218: #include "readconf.h"
219:
220: /*------------ definitions for login.c -------------*/
221:
222: /* Returns the time when the user last logged in. Returns 0 if the
223: information is not available. This must be called before record_login.
224: The host from which the user logged in is stored in buf. */
225: unsigned long get_last_login_time(uid_t uid, const char *logname,
226: char *buf, unsigned int bufsize);
227:
228: /* Records that the user has logged in. This does many things normally
229: done by login(1). */
230: void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
231: const char *host, struct sockaddr_in *addr);
232:
233: /* Records that the user has logged out. This does many thigs normally
234: done by login(1) or init. */
235: void record_logout(int pid, const char *ttyname);
236:
237: /*------------ definitions for sshconnect.c ----------*/
238:
239: /* Opens a TCP/IP connection to the remote server on the given host. If
240: port is 0, the default port will be used. If anonymous is zero,
241: a privileged port will be allocated to make the connection.
242: This requires super-user privileges if anonymous is false.
243: Connection_attempts specifies the maximum number of tries, one per
244: second. This returns true on success, and zero on failure. If the
245: connection is successful, this calls packet_set_connection for the
246: connection. */
1.6 ! provos 247: int ssh_connect(const char *host, struct sockaddr_in *hostaddr,
! 248: int port, int connection_attempts,
1.1 deraadt 249: int anonymous, uid_t original_real_uid,
1.3 provos 250: const char *proxy_command);
1.1 deraadt 251:
252: /* Starts a dialog with the server, and authenticates the current user on the
253: server. This does not need any extra privileges. The basic connection
254: to the server must already have been established before this is called.
255: If login fails, this function prints an error and never returns.
256: This initializes the random state, and leaves it initialized (it will also
257: have references from the packet module). */
1.6 ! provos 258: void ssh_login(int host_key_valid, RSA *host_key, const char *host,
! 259: struct sockaddr_in *hostaddr, Options *options,
! 260: uid_t original_real_uid);
1.1 deraadt 261:
262: /*------------ Definitions for various authentication methods. -------*/
263:
264: /* Tries to authenticate the user using the .rhosts file. Returns true if
265: authentication succeeds. If ignore_rhosts is non-zero, this will not
266: consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
267: If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
268: int auth_rhosts(struct passwd *pw, const char *client_user,
269: int ignore_rhosts, int strict_modes);
270:
271: /* Tries to authenticate the user using the .rhosts file and the host using
272: its host key. Returns true if authentication succeeds. */
1.3 provos 273: int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
274: unsigned int bits, BIGNUM *client_host_key_e,
275: BIGNUM *client_host_key_n, int ignore_rhosts,
1.1 deraadt 276: int strict_modes);
277:
278: /* Tries to authenticate the user using password. Returns true if
279: authentication succeeds. */
280: int auth_password(const char *server_user, const char *password);
281:
282: /* Performs the RSA authentication dialog with the client. This returns
283: 0 if the client could not be authenticated, and 1 if authentication was
284: successful. This may exit if there is a serious protocol violation. */
1.3 provos 285: int auth_rsa(struct passwd *pw, BIGNUM *client_n);
1.1 deraadt 286:
287: /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
288: over the key. Skips any whitespace at the beginning and at end. */
1.3 provos 289: int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n);
1.1 deraadt 290:
291: /* Returns the name of the machine at the other end of the socket. The
292: returned string should be freed by the caller. */
293: char *get_remote_hostname(int socket);
294:
295: /* Return the canonical name of the host in the other side of the current
296: connection (as returned by packet_get_connection). The host name is
297: cached, so it is efficient to call this several times. */
298: const char *get_canonical_hostname(void);
299:
300: /* Returns the remote IP address as an ascii string. The value need not be
301: freed by the caller. */
302: const char *get_remote_ipaddr(void);
303:
304: /* Returns the port number of the peer of the socket. */
305: int get_peer_port(int sock);
306:
307: /* Returns the port number of the remote host. */
308: int get_remote_port(void);
309:
310: /* Tries to match the host name (which must be in all lowercase) against the
311: comma-separated sequence of subpatterns (each possibly preceded by ! to
312: indicate negation). Returns true if there is a positive match; zero
313: otherwise. */
314: int match_hostname(const char *host, const char *pattern, unsigned int len);
315:
316: /* Checks whether the given host is already in the list of our known hosts.
317: Returns HOST_OK if the host is known and has the specified key,
318: HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
319: but used to have a different host key. The host must be in all lowercase. */
1.6 ! provos 320: typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED, HOST_DIFFER } HostStatus;
1.1 deraadt 321: HostStatus check_host_in_hostfile(const char *filename,
322: const char *host, unsigned int bits,
1.6 ! provos 323: BIGNUM *e, BIGNUM *n,
! 324: BIGNUM *ke, BIGNUM *kn);
1.1 deraadt 325:
326: /* Appends an entry to the host file. Returns false if the entry
327: could not be appended. */
328: int add_host_to_hostfile(const char *filename, const char *host,
1.3 provos 329: unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 330:
331: /* Performs the RSA authentication challenge-response dialog with the client,
332: and returns true (non-zero) if the client gave the correct answer to
333: our challenge; returns zero if the client gives a wrong answer. */
1.3 provos 334: int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 335:
336: /* Reads a passphrase from /dev/tty with echo turned off. Returns the
337: passphrase (allocated with xmalloc). Exits if EOF is encountered.
338: If from_stdin is true, the passphrase will be read from stdin instead. */
339: char *read_passphrase(const char *prompt, int from_stdin);
340:
341: /* Saves the authentication (private) key in a file, encrypting it with
342: passphrase. The identification of the file (lowest 64 bits of n)
343: will precede the key to provide identification of the key without
344: needing a passphrase. */
345: int save_private_key(const char *filename, const char *passphrase,
1.3 provos 346: RSA *private_key, const char *comment);
1.1 deraadt 347:
348: /* Loads the public part of the key file (public key and comment).
349: Returns 0 if an error occurred; zero if the public key was successfully
350: read. The comment of the key is returned in comment_return if it is
351: non-NULL; the caller must free the value with xfree. */
1.3 provos 352: int load_public_key(const char *filename, RSA *pub,
1.1 deraadt 353: char **comment_return);
354:
355: /* Loads the private key from the file. Returns 0 if an error is encountered
356: (file does not exist or is not readable, or passphrase is bad).
357: This initializes the private key. The comment of the key is returned
358: in comment_return if it is non-NULL; the caller must free the value
359: with xfree. */
360: int load_private_key(const char *filename, const char *passphrase,
1.3 provos 361: RSA *private_key, char **comment_return);
1.1 deraadt 362:
363: /*------------ Definitions for logging. -----------------------*/
364:
365: /* Supported syslog facilities. */
366: typedef enum
367: {
368: SYSLOG_FACILITY_DAEMON,
369: SYSLOG_FACILITY_USER,
370: SYSLOG_FACILITY_AUTH,
371: SYSLOG_FACILITY_LOCAL0,
372: SYSLOG_FACILITY_LOCAL1,
373: SYSLOG_FACILITY_LOCAL2,
374: SYSLOG_FACILITY_LOCAL3,
375: SYSLOG_FACILITY_LOCAL4,
376: SYSLOG_FACILITY_LOCAL5,
377: SYSLOG_FACILITY_LOCAL6,
378: SYSLOG_FACILITY_LOCAL7
379: } SyslogFacility;
380:
381: /* Initializes logging. If debug is non-zero, debug() will output something.
382: If quiet is non-zero, none of these will log send anything to syslog
383: (but maybe to stderr). */
384: void log_init(char *av0, int on_stderr, int debug, int quiet,
385: SyslogFacility facility);
386:
387: /* Outputs a message to syslog or stderr, depending on the implementation.
388: The format must guarantee that the final message does not exceed 1024
389: characters. The message should not contain newline. */
390: void log(const char *fmt, ...);
391:
392: /* Outputs a message to syslog or stderr, depending on the implementation.
393: The format must guarantee that the final message does not exceed 1024
394: characters. The message should not contain newline. */
395: void debug(const char *fmt, ...);
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 error(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: This call never returns. */
406: void fatal(const char *fmt, ...);
407:
408: /* Registers a cleanup function to be called by fatal() before exiting.
409: It is permissible to call fatal_remove_cleanup for the function itself
410: from the function. */
411: void fatal_add_cleanup(void (*proc)(void *context), void *context);
412:
413: /* Removes a cleanup frunction to be called at fatal(). */
414: void fatal_remove_cleanup(void (*proc)(void *context), void *context);
415:
416: /*---------------- definitions for x11.c ------------------*/
417:
418:
419: /* Sets specific protocol options. */
420: void channel_set_options(int hostname_in_open);
421:
422: /* Allocate a new channel object and set its type and socket. Remote_name
423: must have been allocated with xmalloc; this will free it when the channel
424: is freed. */
425: int channel_allocate(int type, int sock, char *remote_name);
426:
427: /* Free the channel and close its socket. */
428: void channel_free(int channel);
429:
430: /* Add any bits relevant to channels in select bitmasks. */
431: void channel_prepare_select(fd_set *readset, fd_set *writeset);
432:
433: /* After select, perform any appropriate operations for channels which
434: have events pending. */
435: void channel_after_select(fd_set *readset, fd_set *writeset);
436:
437: /* If there is data to send to the connection, send some of it now. */
438: void channel_output_poll(void);
439:
440: /* This is called when a packet of type CHANNEL_DATA has just been received.
441: The message type has already been consumed, but channel number and data
442: is still there. */
443: void channel_input_data(int payload_len);
444:
445: /* Returns true if no channel has too much buffered data. */
446: int channel_not_very_much_buffered_data(void);
447:
448: /* This is called after receiving CHANNEL_CLOSE. */
449: void channel_input_close(void);
450:
451: /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
452: void channel_input_close_confirmation(void);
453:
454: /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
455: void channel_input_open_confirmation(void);
456:
457: /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
458: void channel_input_open_failure(void);
459:
460: /* This closes any sockets that are listening for connections; this removes
461: any unix domain sockets. */
462: void channel_stop_listening(void);
463:
464: /* Closes the sockets of all channels. This is used to close extra file
465: descriptors after a fork. */
466: void channel_close_all(void);
467:
468: /* Returns the maximum file descriptor number used by the channels. */
469: int channel_max_fd(void);
470:
471: /* Returns true if there is still an open channel over the connection. */
472: int channel_still_open(void);
473:
474: /* Returns a string containing a list of all open channels. The list is
475: suitable for displaying to the user. It uses crlf instead of newlines.
476: The caller should free the string with xfree. */
477: char *channel_open_message(void);
478:
479: /* Initiate forwarding of connections to local port "port" through the secure
480: channel to host:port from remote side. This never returns if there
481: was an error. */
482: void channel_request_local_forwarding(int port, const char *host,
483: int remote_port);
484:
485: /* Initiate forwarding of connections to port "port" on remote host through
486: the secure channel to host:port from local side. This never returns
487: if there was an error. This registers that open requests for that
488: port are permitted. */
489: void channel_request_remote_forwarding(int port, const char *host,
490: int remote_port);
491:
492: /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
493: called by the server, because the user could connect to any port anyway,
494: and the server has no way to know but to trust the client anyway. */
495: void channel_permit_all_opens(void);
496:
497: /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
498: listening for the port, and sends back a success reply (or disconnect
499: message if there was an error). This never returns if there was an
500: error. */
501: void channel_input_port_forward_request(int is_root);
502:
503: /* This is called after receiving PORT_OPEN message. This attempts to connect
504: to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
505: CHANNEL_OPEN_FAILURE. */
506: void channel_input_port_open(int payload_len);
507:
508: /* Creates a port for X11 connections, and starts listening for it.
509: Returns the display name, or NULL if an error was encountered. */
510: char *x11_create_display(int screen);
511:
512: /* Creates an internet domain socket for listening for X11 connections.
513: Returns a suitable value for the DISPLAY variable, or NULL if an error
514: occurs. */
515: char *x11_create_display_inet(int screen);
516:
517: /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
518: the remote channel number. We should do whatever we want, and respond
519: with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
520: void x11_input_open(int payload_len);
521:
522: /* Requests forwarding of X11 connections. This should be called on the
523: client only. */
524: void x11_request_forwarding(void);
525:
526: /* Requests forwarding for X11 connections, with authentication spoofing.
527: This should be called in the client only. */
1.3 provos 528: void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
1.1 deraadt 529:
530: /* Local Xauthority file (server only). */
531: extern char *xauthfile;
532:
533: /* Sends a message to the server to request authentication fd forwarding. */
534: void auth_request_forwarding(void);
535:
536: /* Returns the number of the file descriptor to pass to child programs as
537: the authentication fd. */
538: int auth_get_fd(void);
539:
540: /* Returns the name of the forwarded authentication socket. Returns NULL
541: if there is no forwarded authentication socket. The returned value points
542: to a static buffer. */
543: char *auth_get_socket_name(void);
544:
545: /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
546: This starts forwarding authentication requests. */
547: void auth_input_request_forwarding(struct passwd *pw);
548:
549: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
550: void auth_input_open_request(void);
551:
552: /* Returns true if the given string matches the pattern (which may contain
553: ? and * as wildcards), and zero if it does not match. */
554: int match_pattern(const char *s, const char *pattern);
555:
556: /* Expands tildes in the file name. Returns data allocated by xmalloc.
557: Warning: this calls getpw*. */
558: char *tilde_expand_filename(const char *filename, uid_t my_uid);
559:
560: /* Gets a file descriptor that won't get closed by shell pathname.
561: If pathname is NULL, the path is inferred from the SHELL environment
562: variable or the user id. */
563: int get_permanent_fd(const char *pathname);
564:
565: /* Performs the interactive session. This handles data transmission between
566: the client and the program. Note that the notion of stdin, stdout, and
567: stderr in this function is sort of reversed: this function writes to
568: stdin (of the child program), and reads from stdout and stderr (of the
569: child program). */
570: void server_loop(int pid, int fdin, int fdout, int fderr);
571:
572: /* Client side main loop for the interactive session. */
573: int client_loop(int have_pty, int escape_char);
574:
575: /* Linked list of custom environment strings (see auth-rsa.c). */
576: struct envstring {
577: struct envstring *next;
578: char *s;
579: };
580:
581: #ifdef KRB4
582: #include <krb.h>
583:
1.4 dugsong 584: /* Performs Kerberos v4 mutual authentication with the client. This returns
585: 0 if the client could not be authenticated, and 1 if authentication was
586: successful. This may exit if there is a serious protocol violation. */
587: int auth_krb4(const char *server_user, KTEXT auth, char **client);
1.1 deraadt 588: int ssh_tf_init(uid_t uid);
1.4 dugsong 589:
590: #ifdef AFS
591: #include <kafs.h>
592:
593: /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
1.1 deraadt 594: int auth_kerberos_tgt(struct passwd *pw, const char *string);
595: int auth_afs_token(char *server_user, uid_t uid, const char *string);
596:
597: int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
598: int radix_to_creds(const char *buf, CREDENTIALS *creds);
1.4 dugsong 599: #endif /* AFS */
1.1 deraadt 600:
601: #endif /* KRB4 */
602:
603: #endif /* SSH_H */