Annotation of src/usr.bin/ssh/ssh.h, Revision 1.4
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:
1.4 ! dugsong 16: /* RCSID("$Id: ssh.h,v 1.3 1999/09/28 04:45:37 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: /* Random seed file for the daemon. This file should be readable only by
74: root. */
75: #define SSH_DAEMON_SEED_FILE ETCDIR "/ssh_random_seed"
76:
77: /* The process id of the daemon listening for connections is saved
78: here to make it easier to kill the correct daemon when necessary. */
79: #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
80:
81: /* The directory in user\'s home directory in which the files reside.
82: The directory should be world-readable (though not all files are). */
83: #define SSH_USER_DIR ".ssh"
84:
85: /* Per-user file containing host keys of known hosts. This file need
86: not be readable by anyone except the user him/herself, though this does
87: not contain anything particularly secret. */
88: #define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
89:
90: /* Name of the file containing client-side random seed. This file should
91: only be readable by the user him/herself. */
92: #define SSH_CLIENT_SEEDFILE ".ssh/random_seed"
93:
94: /* Name of the default file containing client-side authentication key.
95: This file should only be readable by the user him/herself. */
96: #define SSH_CLIENT_IDENTITY ".ssh/identity"
97:
98: /* Configuration file in user\'s home directory. 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. */
103: #define SSH_USER_CONFFILE ".ssh/config"
104:
105: /* File containing a list of those rsa keys that permit logging in as
106: this user. This file need not be
107: readable by anyone but the user him/herself, but does not contain
108: anything particularly secret. If the user\'s home directory resides
109: on an NFS volume where root is mapped to nobody, this may need to be
110: world-readable. (This file is read by the daemon which is running as
111: root.) */
112: #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
113:
114: /* Per-user and system-wide ssh "rc" files. These files are executed with
115: /bin/sh before starting the shell or command if they exist. They
116: will be passed "proto cookie" as arguments if X11 forwarding with
117: spoofing is in use. xauth will be run if neither of these exists. */
118: #define SSH_USER_RC ".ssh/rc"
119: #define SSH_SYSTEM_RC ETCDIR "/sshrc"
120:
121: /* Ssh-only version of /etc/hosts.equiv. */
122: #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
123:
124: /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
125: rhosts authentication is enabled. */
126:
127: /* Socket for connecting the authentication agent. Normally the connection
128: to the authentication agent is passed in a file descriptor; however,
129: on some systems, commonly used shells close all open file descriptors.
130: To make the agent usable on those systems, configure checks whether
131: the shells close all descriptors, and if so, defines AGENT_USES_SOCKET.
132: That socket is an unix-domain socket and will be stored with this name
133: in the user\'s home directory. The socket must not be accessible by
134: anyone but the user him/herself. The number at the end of the name
135: is the pid of the agent or the forwarding daemon. Note that this
136: socket is stored in /tmp, which is supposedly on the local machine. If
137: this were in the user\'s home directory, the daemon (running as root)
138: might not be able to create and chown the file to the user\'s uid. */
139: #define SSH_AGENT_SOCKET "/tmp/ssh_agent.%d"
140:
141: /* Name of the environment variable containing the authentication fd. */
142: #define SSH_AUTHFD_ENV_NAME "SSH_AUTHENTICATION_FD"
143:
144: /* Name of the environment variable containing the pathname of the
145: authentication socket. */
146: #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTHENTICATION_SOCKET"
147:
148: /* Force host key length and server key length to differ by at least this
149: many bits. This is to make double encryption with rsaref work. */
150: #define SSH_KEY_BITS_RESERVED 128
151:
152: /* Length of the session key in bytes. (Specified as 256 bits in the
153: protocol.) */
154: #define SSH_SESSION_KEY_LENGTH 32
155:
156: /* Name of Kerberos service for SSH to use. */
157: #define KRB4_SERVICE_NAME "rcmd"
158:
159: /* Authentication methods. New types can be added, but old types should not
160: be removed for compatibility. The maximum allowed value is 31. */
161: #define SSH_AUTH_RHOSTS 1
162: #define SSH_AUTH_RSA 2
163: #define SSH_AUTH_PASSWORD 3
164: #define SSH_AUTH_RHOSTS_RSA 4
165: /* 5 is TIS */
166: #define SSH_AUTH_KERBEROS 6
167: #define SSH_PASS_KERBEROS_TGT 7
168: #define SSH_PASS_AFS_TOKEN 21
169:
170: /* Protocol flags. These are bit masks. */
171: #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
172: #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
173:
174: /* Definition of message types. New values can be added, but old values
175: should not be removed or without careful consideration of the consequences
176: for compatibility. The maximum value is 254; value 255 is reserved
177: for future extension. */
178: /* Message name */ /* msg code */ /* arguments */
179: #define SSH_MSG_NONE 0 /* no message */
180: #define SSH_MSG_DISCONNECT 1 /* cause (string) */
181: #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
1.3 provos 182: #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
1.1 deraadt 183: #define SSH_CMSG_USER 4 /* user (string) */
184: #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
1.3 provos 185: #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
186: #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
187: #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
1.1 deraadt 188: #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
189: #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
190: #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
191: #define SSH_CMSG_EXEC_SHELL 12 /* */
192: #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
193: #define SSH_SMSG_SUCCESS 14 /* */
194: #define SSH_SMSG_FAILURE 15 /* */
195: #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
196: #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
197: #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
198: #define SSH_CMSG_EOF 19 /* */
199: #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
200: #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
201: #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
202: #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
203: #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
204: #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
205: /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
206: #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
207: #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
208: #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
209: #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
210: #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
211: #define SSH_MSG_IGNORE 32 /* string */
212: #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
213: #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
214: #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
215: #define SSH_MSG_DEBUG 36 /* string */
216: #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
217:
218: #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
219: #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
220: #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
221: #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
222:
223:
224: /* Includes that need definitions above. */
225:
226: #include "readconf.h"
227:
228: /*------------ definitions for login.c -------------*/
229:
230: /* Returns the time when the user last logged in. Returns 0 if the
231: information is not available. This must be called before record_login.
232: The host from which the user logged in is stored in buf. */
233: unsigned long get_last_login_time(uid_t uid, const char *logname,
234: char *buf, unsigned int bufsize);
235:
236: /* Records that the user has logged in. This does many things normally
237: done by login(1). */
238: void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
239: const char *host, struct sockaddr_in *addr);
240:
241: /* Records that the user has logged out. This does many thigs normally
242: done by login(1) or init. */
243: void record_logout(int pid, const char *ttyname);
244:
245: /*------------ definitions for sshconnect.c ----------*/
246:
247: /* Opens a TCP/IP connection to the remote server on the given host. If
248: port is 0, the default port will be used. If anonymous is zero,
249: a privileged port will be allocated to make the connection.
250: This requires super-user privileges if anonymous is false.
251: Connection_attempts specifies the maximum number of tries, one per
252: second. This returns true on success, and zero on failure. If the
253: connection is successful, this calls packet_set_connection for the
254: connection. */
255: int ssh_connect(const char *host, int port, int connection_attempts,
256: int anonymous, uid_t original_real_uid,
1.3 provos 257: const char *proxy_command);
1.1 deraadt 258:
259: /* Starts a dialog with the server, and authenticates the current user on the
260: server. This does not need any extra privileges. The basic connection
261: to the server must already have been established before this is called.
262: If login fails, this function prints an error and never returns.
263: This initializes the random state, and leaves it initialized (it will also
264: have references from the packet module). */
1.3 provos 265: void ssh_login(int host_key_valid, RSA *host_key,
1.1 deraadt 266: const char *host, Options *options, uid_t original_real_uid);
267:
268: /*------------ Definitions for various authentication methods. -------*/
269:
270: /* Tries to authenticate the user using the .rhosts file. Returns true if
271: authentication succeeds. If ignore_rhosts is non-zero, this will not
272: consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
273: If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
274: int auth_rhosts(struct passwd *pw, const char *client_user,
275: int ignore_rhosts, int strict_modes);
276:
277: /* Tries to authenticate the user using the .rhosts file and the host using
278: its host key. Returns true if authentication succeeds. */
1.3 provos 279: int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
280: unsigned int bits, BIGNUM *client_host_key_e,
281: BIGNUM *client_host_key_n, int ignore_rhosts,
1.1 deraadt 282: int strict_modes);
283:
284: /* Tries to authenticate the user using password. Returns true if
285: authentication succeeds. */
286: int auth_password(const char *server_user, const char *password);
287:
288: /* Performs the RSA authentication dialog with the client. This returns
289: 0 if the client could not be authenticated, and 1 if authentication was
290: successful. This may exit if there is a serious protocol violation. */
1.3 provos 291: int auth_rsa(struct passwd *pw, BIGNUM *client_n);
1.1 deraadt 292:
293: /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
294: over the key. Skips any whitespace at the beginning and at end. */
1.3 provos 295: int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n);
1.1 deraadt 296:
297: /* Returns the name of the machine at the other end of the socket. The
298: returned string should be freed by the caller. */
299: char *get_remote_hostname(int socket);
300:
301: /* Return the canonical name of the host in the other side of the current
302: connection (as returned by packet_get_connection). The host name is
303: cached, so it is efficient to call this several times. */
304: const char *get_canonical_hostname(void);
305:
306: /* Returns the remote IP address as an ascii string. The value need not be
307: freed by the caller. */
308: const char *get_remote_ipaddr(void);
309:
310: /* Returns the port number of the peer of the socket. */
311: int get_peer_port(int sock);
312:
313: /* Returns the port number of the remote host. */
314: int get_remote_port(void);
315:
316: /* Tries to match the host name (which must be in all lowercase) against the
317: comma-separated sequence of subpatterns (each possibly preceded by ! to
318: indicate negation). Returns true if there is a positive match; zero
319: otherwise. */
320: int match_hostname(const char *host, const char *pattern, unsigned int len);
321:
322: /* Checks whether the given host is already in the list of our known hosts.
323: Returns HOST_OK if the host is known and has the specified key,
324: HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
325: but used to have a different host key. The host must be in all lowercase. */
326: typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus;
327: HostStatus check_host_in_hostfile(const char *filename,
328: const char *host, unsigned int bits,
1.3 provos 329: BIGNUM *e, BIGNUM *n);
1.1 deraadt 330:
331: /* Appends an entry to the host file. Returns false if the entry
332: could not be appended. */
333: int add_host_to_hostfile(const char *filename, const char *host,
1.3 provos 334: unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 335:
336: /* Performs the RSA authentication challenge-response dialog with the client,
337: and returns true (non-zero) if the client gave the correct answer to
338: our challenge; returns zero if the client gives a wrong answer. */
1.3 provos 339: int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 340:
341: /* Reads a passphrase from /dev/tty with echo turned off. Returns the
342: passphrase (allocated with xmalloc). Exits if EOF is encountered.
343: If from_stdin is true, the passphrase will be read from stdin instead. */
344: char *read_passphrase(const char *prompt, int from_stdin);
345:
346: /* Saves the authentication (private) key in a file, encrypting it with
347: passphrase. The identification of the file (lowest 64 bits of n)
348: will precede the key to provide identification of the key without
349: needing a passphrase. */
350: int save_private_key(const char *filename, const char *passphrase,
1.3 provos 351: RSA *private_key, const char *comment);
1.1 deraadt 352:
353: /* Loads the public part of the key file (public key and comment).
354: Returns 0 if an error occurred; zero if the public key was successfully
355: read. The comment of the key is returned in comment_return if it is
356: non-NULL; the caller must free the value with xfree. */
1.3 provos 357: int load_public_key(const char *filename, RSA *pub,
1.1 deraadt 358: char **comment_return);
359:
360: /* Loads the private key from the file. Returns 0 if an error is encountered
361: (file does not exist or is not readable, or passphrase is bad).
362: This initializes the private key. The comment of the key is returned
363: in comment_return if it is non-NULL; the caller must free the value
364: with xfree. */
365: int load_private_key(const char *filename, const char *passphrase,
1.3 provos 366: RSA *private_key, char **comment_return);
1.1 deraadt 367:
368: /*------------ Definitions for logging. -----------------------*/
369:
370: /* Supported syslog facilities. */
371: typedef enum
372: {
373: SYSLOG_FACILITY_DAEMON,
374: SYSLOG_FACILITY_USER,
375: SYSLOG_FACILITY_AUTH,
376: SYSLOG_FACILITY_LOCAL0,
377: SYSLOG_FACILITY_LOCAL1,
378: SYSLOG_FACILITY_LOCAL2,
379: SYSLOG_FACILITY_LOCAL3,
380: SYSLOG_FACILITY_LOCAL4,
381: SYSLOG_FACILITY_LOCAL5,
382: SYSLOG_FACILITY_LOCAL6,
383: SYSLOG_FACILITY_LOCAL7
384: } SyslogFacility;
385:
386: /* Initializes logging. If debug is non-zero, debug() will output something.
387: If quiet is non-zero, none of these will log send anything to syslog
388: (but maybe to stderr). */
389: void log_init(char *av0, int on_stderr, int debug, int quiet,
390: SyslogFacility facility);
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 log(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 debug(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 error(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: This call never returns. */
411: void fatal(const char *fmt, ...);
412:
413: /* Registers a cleanup function to be called by fatal() before exiting.
414: It is permissible to call fatal_remove_cleanup for the function itself
415: from the function. */
416: void fatal_add_cleanup(void (*proc)(void *context), void *context);
417:
418: /* Removes a cleanup frunction to be called at fatal(). */
419: void fatal_remove_cleanup(void (*proc)(void *context), void *context);
420:
421: /*---------------- definitions for x11.c ------------------*/
422:
423:
424: /* Sets specific protocol options. */
425: void channel_set_options(int hostname_in_open);
426:
427: /* Allocate a new channel object and set its type and socket. Remote_name
428: must have been allocated with xmalloc; this will free it when the channel
429: is freed. */
430: int channel_allocate(int type, int sock, char *remote_name);
431:
432: /* Free the channel and close its socket. */
433: void channel_free(int channel);
434:
435: /* Add any bits relevant to channels in select bitmasks. */
436: void channel_prepare_select(fd_set *readset, fd_set *writeset);
437:
438: /* After select, perform any appropriate operations for channels which
439: have events pending. */
440: void channel_after_select(fd_set *readset, fd_set *writeset);
441:
442: /* If there is data to send to the connection, send some of it now. */
443: void channel_output_poll(void);
444:
445: /* This is called when a packet of type CHANNEL_DATA has just been received.
446: The message type has already been consumed, but channel number and data
447: is still there. */
448: void channel_input_data(int payload_len);
449:
450: /* Returns true if no channel has too much buffered data. */
451: int channel_not_very_much_buffered_data(void);
452:
453: /* This is called after receiving CHANNEL_CLOSE. */
454: void channel_input_close(void);
455:
456: /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
457: void channel_input_close_confirmation(void);
458:
459: /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
460: void channel_input_open_confirmation(void);
461:
462: /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
463: void channel_input_open_failure(void);
464:
465: /* This closes any sockets that are listening for connections; this removes
466: any unix domain sockets. */
467: void channel_stop_listening(void);
468:
469: /* Closes the sockets of all channels. This is used to close extra file
470: descriptors after a fork. */
471: void channel_close_all(void);
472:
473: /* Returns the maximum file descriptor number used by the channels. */
474: int channel_max_fd(void);
475:
476: /* Returns true if there is still an open channel over the connection. */
477: int channel_still_open(void);
478:
479: /* Returns a string containing a list of all open channels. The list is
480: suitable for displaying to the user. It uses crlf instead of newlines.
481: The caller should free the string with xfree. */
482: char *channel_open_message(void);
483:
484: /* Initiate forwarding of connections to local port "port" through the secure
485: channel to host:port from remote side. This never returns if there
486: was an error. */
487: void channel_request_local_forwarding(int port, const char *host,
488: int remote_port);
489:
490: /* Initiate forwarding of connections to port "port" on remote host through
491: the secure channel to host:port from local side. This never returns
492: if there was an error. This registers that open requests for that
493: port are permitted. */
494: void channel_request_remote_forwarding(int port, const char *host,
495: int remote_port);
496:
497: /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
498: called by the server, because the user could connect to any port anyway,
499: and the server has no way to know but to trust the client anyway. */
500: void channel_permit_all_opens(void);
501:
502: /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
503: listening for the port, and sends back a success reply (or disconnect
504: message if there was an error). This never returns if there was an
505: error. */
506: void channel_input_port_forward_request(int is_root);
507:
508: /* This is called after receiving PORT_OPEN message. This attempts to connect
509: to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
510: CHANNEL_OPEN_FAILURE. */
511: void channel_input_port_open(int payload_len);
512:
513: /* Creates a port for X11 connections, and starts listening for it.
514: Returns the display name, or NULL if an error was encountered. */
515: char *x11_create_display(int screen);
516:
517: /* Creates an internet domain socket for listening for X11 connections.
518: Returns a suitable value for the DISPLAY variable, or NULL if an error
519: occurs. */
520: char *x11_create_display_inet(int screen);
521:
522: /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
523: the remote channel number. We should do whatever we want, and respond
524: with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
525: void x11_input_open(int payload_len);
526:
527: /* Requests forwarding of X11 connections. This should be called on the
528: client only. */
529: void x11_request_forwarding(void);
530:
531: /* Requests forwarding for X11 connections, with authentication spoofing.
532: This should be called in the client only. */
1.3 provos 533: void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
1.1 deraadt 534:
535: /* Local Xauthority file (server only). */
536: extern char *xauthfile;
537:
538: /* Sends a message to the server to request authentication fd forwarding. */
539: void auth_request_forwarding(void);
540:
541: /* Returns the number of the file descriptor to pass to child programs as
542: the authentication fd. */
543: int auth_get_fd(void);
544:
545: /* Returns the name of the forwarded authentication socket. Returns NULL
546: if there is no forwarded authentication socket. The returned value points
547: to a static buffer. */
548: char *auth_get_socket_name(void);
549:
550: /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
551: This starts forwarding authentication requests. */
552: void auth_input_request_forwarding(struct passwd *pw);
553:
554: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
555: void auth_input_open_request(void);
556:
557: /* Returns true if the given string matches the pattern (which may contain
558: ? and * as wildcards), and zero if it does not match. */
559: int match_pattern(const char *s, const char *pattern);
560:
561: /* Expands tildes in the file name. Returns data allocated by xmalloc.
562: Warning: this calls getpw*. */
563: char *tilde_expand_filename(const char *filename, uid_t my_uid);
564:
565: /* Gets a file descriptor that won't get closed by shell pathname.
566: If pathname is NULL, the path is inferred from the SHELL environment
567: variable or the user id. */
568: int get_permanent_fd(const char *pathname);
569:
570: /* Performs the interactive session. This handles data transmission between
571: the client and the program. Note that the notion of stdin, stdout, and
572: stderr in this function is sort of reversed: this function writes to
573: stdin (of the child program), and reads from stdout and stderr (of the
574: child program). */
575: void server_loop(int pid, int fdin, int fdout, int fderr);
576:
577: /* Client side main loop for the interactive session. */
578: int client_loop(int have_pty, int escape_char);
579:
580: /* Linked list of custom environment strings (see auth-rsa.c). */
581: struct envstring {
582: struct envstring *next;
583: char *s;
584: };
585:
586: #ifdef KRB4
587: #include <krb.h>
588:
1.4 ! dugsong 589: /* Performs Kerberos v4 mutual authentication with the client. This returns
! 590: 0 if the client could not be authenticated, and 1 if authentication was
! 591: successful. This may exit if there is a serious protocol violation. */
! 592: int auth_krb4(const char *server_user, KTEXT auth, char **client);
1.1 deraadt 593: int ssh_tf_init(uid_t uid);
1.4 ! dugsong 594:
! 595: #ifdef AFS
! 596: #include <kafs.h>
! 597:
! 598: /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
1.1 deraadt 599: int auth_kerberos_tgt(struct passwd *pw, const char *string);
600: int auth_afs_token(char *server_user, uid_t uid, const char *string);
601:
602: int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
603: int radix_to_creds(const char *buf, CREDENTIALS *creds);
1.4 ! dugsong 604: #endif /* AFS */
1.1 deraadt 605:
606: #endif /* KRB4 */
607:
608: #endif /* SSH_H */
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh.h CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh