Annotation of src/usr.bin/ssh/ssh.h, Revision 1.19
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:
1.19 ! markus 16: /* RCSID("$Id: ssh.h,v 1.18 1999/11/10 23:36:44 markus 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. */
1.13 markus 48: #define PROTOCOL_MINOR 5
1.1 deraadt 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: /* Name of the environment variable containing the pathname of the
120: authentication socket. */
1.13 markus 121: #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
1.15 markus 122:
123: /* Name of the environment variable containing the pathname of the
124: authentication socket. */
125: #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
1.1 deraadt 126:
127: /* Force host key length and server key length to differ by at least this
128: many bits. This is to make double encryption with rsaref work. */
129: #define SSH_KEY_BITS_RESERVED 128
130:
131: /* Length of the session key in bytes. (Specified as 256 bits in the
132: protocol.) */
133: #define SSH_SESSION_KEY_LENGTH 32
134:
135: /* Name of Kerberos service for SSH to use. */
136: #define KRB4_SERVICE_NAME "rcmd"
137:
138: /* Authentication methods. New types can be added, but old types should not
139: be removed for compatibility. The maximum allowed value is 31. */
140: #define SSH_AUTH_RHOSTS 1
141: #define SSH_AUTH_RSA 2
142: #define SSH_AUTH_PASSWORD 3
143: #define SSH_AUTH_RHOSTS_RSA 4
144: /* 5 is TIS */
145: #define SSH_AUTH_KERBEROS 6
146: #define SSH_PASS_KERBEROS_TGT 7
1.13 markus 147: /* 8 to 15 are reserved */
1.1 deraadt 148: #define SSH_PASS_AFS_TOKEN 21
149:
150: /* Protocol flags. These are bit masks. */
151: #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
152: #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
153:
154: /* Definition of message types. New values can be added, but old values
155: should not be removed or without careful consideration of the consequences
156: for compatibility. The maximum value is 254; value 255 is reserved
157: for future extension. */
158: /* Message name */ /* msg code */ /* arguments */
159: #define SSH_MSG_NONE 0 /* no message */
160: #define SSH_MSG_DISCONNECT 1 /* cause (string) */
161: #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
1.3 provos 162: #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
1.1 deraadt 163: #define SSH_CMSG_USER 4 /* user (string) */
164: #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
1.3 provos 165: #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
166: #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
167: #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
1.1 deraadt 168: #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
169: #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
170: #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
171: #define SSH_CMSG_EXEC_SHELL 12 /* */
172: #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
173: #define SSH_SMSG_SUCCESS 14 /* */
174: #define SSH_SMSG_FAILURE 15 /* */
175: #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
176: #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
177: #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
178: #define SSH_CMSG_EOF 19 /* */
179: #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
180: #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
181: #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
182: #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
183: #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
184: #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
185: /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
186: #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
187: #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
188: #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
189: #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
190: #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
191: #define SSH_MSG_IGNORE 32 /* string */
192: #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
193: #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
194: #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
195: #define SSH_MSG_DEBUG 36 /* string */
196: #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
1.13 markus 197: #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */
198: #define SSH_CMSG_AUTH_TIS 39 /* this is proto-1.5, but we ignore TIS */
199: #define SSH_SMSG_AUTH_TIS_CHALLENGE 40
200: #define SSH_CMSG_AUTH_TIS_RESPONSE 41
1.1 deraadt 201:
202: #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
203: #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
204: #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
205: #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
206:
207:
1.18 markus 208: /*------------ Definitions for logging. -----------------------*/
209:
210: /* Supported syslog facilities and levels. */
211: typedef enum
212: {
213: SYSLOG_FACILITY_DAEMON,
214: SYSLOG_FACILITY_USER,
215: SYSLOG_FACILITY_AUTH,
216: SYSLOG_FACILITY_LOCAL0,
217: SYSLOG_FACILITY_LOCAL1,
218: SYSLOG_FACILITY_LOCAL2,
219: SYSLOG_FACILITY_LOCAL3,
220: SYSLOG_FACILITY_LOCAL4,
221: SYSLOG_FACILITY_LOCAL5,
222: SYSLOG_FACILITY_LOCAL6,
223: SYSLOG_FACILITY_LOCAL7
224: } SyslogFacility;
225:
226: typedef enum
227: {
228: SYSLOG_LEVEL_QUIET,
229: SYSLOG_LEVEL_FATAL,
230: SYSLOG_LEVEL_ERROR,
231: SYSLOG_LEVEL_INFO,
232: SYSLOG_LEVEL_CHAT,
233: SYSLOG_LEVEL_DEBUG
234: } LogLevel;
235:
236: /* Initializes logging. */
237: void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr);
238:
239: /* Logging implementation, depending on server or client */
240: void do_log(LogLevel level, const char *fmt, va_list args);
241:
242: /* Output a message to syslog or stderr */
243: void fatal(const char *fmt, ...);
244: void error(const char *fmt, ...);
245: void log(const char *fmt, ...);
246: void chat(const char *fmt, ...);
247: void debug(const char *fmt, ...);
248:
249: /* same as fatal() but w/o logging */
250: void fatal_cleanup(void);
251:
252: /* Registers a cleanup function to be called by fatal()/fatal_cleanup() before exiting.
253: It is permissible to call fatal_remove_cleanup for the function itself
254: from the function. */
255: void fatal_add_cleanup(void (*proc)(void *context), void *context);
256:
257: /* Removes a cleanup function to be called at fatal(). */
258: void fatal_remove_cleanup(void (*proc)(void *context), void *context);
1.1 deraadt 259:
260:
261: /*------------ definitions for login.c -------------*/
262:
263: /* Returns the time when the user last logged in. Returns 0 if the
264: information is not available. This must be called before record_login.
265: The host from which the user logged in is stored in buf. */
266: unsigned long get_last_login_time(uid_t uid, const char *logname,
267: char *buf, unsigned int bufsize);
268:
269: /* Records that the user has logged in. This does many things normally
270: done by login(1). */
271: void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
272: const char *host, struct sockaddr_in *addr);
273:
274: /* Records that the user has logged out. This does many thigs normally
275: done by login(1) or init. */
276: void record_logout(int pid, const char *ttyname);
277:
278: /*------------ definitions for sshconnect.c ----------*/
279:
280: /* Opens a TCP/IP connection to the remote server on the given host. If
281: port is 0, the default port will be used. If anonymous is zero,
282: a privileged port will be allocated to make the connection.
283: This requires super-user privileges if anonymous is false.
284: Connection_attempts specifies the maximum number of tries, one per
285: second. This returns true on success, and zero on failure. If the
286: connection is successful, this calls packet_set_connection for the
287: connection. */
1.6 provos 288: int ssh_connect(const char *host, struct sockaddr_in *hostaddr,
289: int port, int connection_attempts,
1.1 deraadt 290: int anonymous, uid_t original_real_uid,
1.3 provos 291: const char *proxy_command);
1.1 deraadt 292:
293: /* Starts a dialog with the server, and authenticates the current user on the
294: server. This does not need any extra privileges. The basic connection
295: to the server must already have been established before this is called.
296: If login fails, this function prints an error and never returns.
297: This initializes the random state, and leaves it initialized (it will also
298: have references from the packet module). */
1.18 markus 299:
300: /* for Options */
301: #include "readconf.h"
302:
1.6 provos 303: void ssh_login(int host_key_valid, RSA *host_key, const char *host,
304: struct sockaddr_in *hostaddr, Options *options,
305: uid_t original_real_uid);
1.1 deraadt 306:
307: /*------------ Definitions for various authentication methods. -------*/
308:
309: /* Tries to authenticate the user using the .rhosts file. Returns true if
310: authentication succeeds. If ignore_rhosts is non-zero, this will not
311: consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
312: If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
313: int auth_rhosts(struct passwd *pw, const char *client_user,
314: int ignore_rhosts, int strict_modes);
315:
316: /* Tries to authenticate the user using the .rhosts file and the host using
317: its host key. Returns true if authentication succeeds. */
1.3 provos 318: int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
319: unsigned int bits, BIGNUM *client_host_key_e,
1.19 ! markus 320: BIGNUM *client_host_key_n);
1.1 deraadt 321:
322: /* Tries to authenticate the user using password. Returns true if
323: authentication succeeds. */
1.9 markus 324: int auth_password(struct passwd *pw, const char *password);
1.1 deraadt 325:
326: /* Performs the RSA authentication dialog with the client. This returns
327: 0 if the client could not be authenticated, and 1 if authentication was
328: successful. This may exit if there is a serious protocol violation. */
1.10 markus 329: int auth_rsa(struct passwd *pw, BIGNUM *client_n, int strict_modes);
1.1 deraadt 330:
331: /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
332: over the key. Skips any whitespace at the beginning and at end. */
1.3 provos 333: int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n);
1.1 deraadt 334:
335: /* Returns the name of the machine at the other end of the socket. The
336: returned string should be freed by the caller. */
337: char *get_remote_hostname(int socket);
338:
339: /* Return the canonical name of the host in the other side of the current
340: connection (as returned by packet_get_connection). The host name is
341: cached, so it is efficient to call this several times. */
342: const char *get_canonical_hostname(void);
343:
344: /* Returns the remote IP address as an ascii string. The value need not be
345: freed by the caller. */
346: const char *get_remote_ipaddr(void);
347:
348: /* Returns the port number of the peer of the socket. */
349: int get_peer_port(int sock);
350:
351: /* Returns the port number of the remote host. */
352: int get_remote_port(void);
353:
354: /* Tries to match the host name (which must be in all lowercase) against the
355: comma-separated sequence of subpatterns (each possibly preceded by ! to
356: indicate negation). Returns true if there is a positive match; zero
357: otherwise. */
358: int match_hostname(const char *host, const char *pattern, unsigned int len);
359:
360: /* Checks whether the given host is already in the list of our known hosts.
361: Returns HOST_OK if the host is known and has the specified key,
362: HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
363: but used to have a different host key. The host must be in all lowercase. */
1.12 provos 364: typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus;
1.1 deraadt 365: HostStatus check_host_in_hostfile(const char *filename,
366: const char *host, unsigned int bits,
1.6 provos 367: BIGNUM *e, BIGNUM *n,
368: BIGNUM *ke, BIGNUM *kn);
1.1 deraadt 369:
370: /* Appends an entry to the host file. Returns false if the entry
371: could not be appended. */
372: int add_host_to_hostfile(const char *filename, const char *host,
1.3 provos 373: unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 374:
375: /* Performs the RSA authentication challenge-response dialog with the client,
376: and returns true (non-zero) if the client gave the correct answer to
377: our challenge; returns zero if the client gives a wrong answer. */
1.3 provos 378: int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 379:
380: /* Reads a passphrase from /dev/tty with echo turned off. Returns the
381: passphrase (allocated with xmalloc). Exits if EOF is encountered.
382: If from_stdin is true, the passphrase will be read from stdin instead. */
383: char *read_passphrase(const char *prompt, int from_stdin);
384:
385: /* Saves the authentication (private) key in a file, encrypting it with
386: passphrase. The identification of the file (lowest 64 bits of n)
387: will precede the key to provide identification of the key without
388: needing a passphrase. */
389: int save_private_key(const char *filename, const char *passphrase,
1.3 provos 390: RSA *private_key, const char *comment);
1.1 deraadt 391:
392: /* Loads the public part of the key file (public key and comment).
393: Returns 0 if an error occurred; zero if the public key was successfully
394: read. The comment of the key is returned in comment_return if it is
395: non-NULL; the caller must free the value with xfree. */
1.3 provos 396: int load_public_key(const char *filename, RSA *pub,
1.1 deraadt 397: char **comment_return);
398:
399: /* Loads the private key from the file. Returns 0 if an error is encountered
400: (file does not exist or is not readable, or passphrase is bad).
401: This initializes the private key. The comment of the key is returned
402: in comment_return if it is non-NULL; the caller must free the value
403: with xfree. */
404: int load_private_key(const char *filename, const char *passphrase,
1.3 provos 405: RSA *private_key, char **comment_return);
1.1 deraadt 406:
1.14 markus 407: /*---------------- definitions for channels ------------------*/
1.1 deraadt 408:
409: /* Sets specific protocol options. */
410: void channel_set_options(int hostname_in_open);
411:
412: /* Allocate a new channel object and set its type and socket. Remote_name
413: must have been allocated with xmalloc; this will free it when the channel
414: is freed. */
415: int channel_allocate(int type, int sock, char *remote_name);
416:
417: /* Free the channel and close its socket. */
418: void channel_free(int channel);
419:
420: /* Add any bits relevant to channels in select bitmasks. */
421: void channel_prepare_select(fd_set *readset, fd_set *writeset);
422:
423: /* After select, perform any appropriate operations for channels which
424: have events pending. */
425: void channel_after_select(fd_set *readset, fd_set *writeset);
426:
427: /* If there is data to send to the connection, send some of it now. */
428: void channel_output_poll(void);
429:
430: /* This is called when a packet of type CHANNEL_DATA has just been received.
431: The message type has already been consumed, but channel number and data
432: is still there. */
433: void channel_input_data(int payload_len);
434:
435: /* Returns true if no channel has too much buffered data. */
436: int channel_not_very_much_buffered_data(void);
437:
438: /* This is called after receiving CHANNEL_CLOSE. */
439: void channel_input_close(void);
440:
441: /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
442: void channel_input_close_confirmation(void);
443:
444: /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
445: void channel_input_open_confirmation(void);
446:
447: /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
448: void channel_input_open_failure(void);
449:
450: /* This closes any sockets that are listening for connections; this removes
451: any unix domain sockets. */
452: void channel_stop_listening(void);
453:
454: /* Closes the sockets of all channels. This is used to close extra file
455: descriptors after a fork. */
456: void channel_close_all(void);
457:
458: /* Returns the maximum file descriptor number used by the channels. */
459: int channel_max_fd(void);
460:
461: /* Returns true if there is still an open channel over the connection. */
462: int channel_still_open(void);
463:
464: /* Returns a string containing a list of all open channels. The list is
465: suitable for displaying to the user. It uses crlf instead of newlines.
466: The caller should free the string with xfree. */
467: char *channel_open_message(void);
468:
469: /* Initiate forwarding of connections to local port "port" through the secure
470: channel to host:port from remote side. This never returns if there
471: was an error. */
472: void channel_request_local_forwarding(int port, const char *host,
473: int remote_port);
474:
475: /* Initiate forwarding of connections to port "port" on remote host through
476: the secure channel to host:port from local side. This never returns
477: if there was an error. This registers that open requests for that
478: port are permitted. */
479: void channel_request_remote_forwarding(int port, const char *host,
480: int remote_port);
481:
482: /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
483: called by the server, because the user could connect to any port anyway,
484: and the server has no way to know but to trust the client anyway. */
485: void channel_permit_all_opens(void);
486:
487: /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
488: listening for the port, and sends back a success reply (or disconnect
489: message if there was an error). This never returns if there was an
490: error. */
491: void channel_input_port_forward_request(int is_root);
492:
493: /* This is called after receiving PORT_OPEN message. This attempts to connect
494: to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
495: CHANNEL_OPEN_FAILURE. */
496: void channel_input_port_open(int payload_len);
497:
498: /* Creates a port for X11 connections, and starts listening for it.
499: Returns the display name, or NULL if an error was encountered. */
500: char *x11_create_display(int screen);
501:
502: /* Creates an internet domain socket for listening for X11 connections.
503: Returns a suitable value for the DISPLAY variable, or NULL if an error
504: occurs. */
505: char *x11_create_display_inet(int screen);
506:
507: /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
508: the remote channel number. We should do whatever we want, and respond
509: with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
510: void x11_input_open(int payload_len);
511:
512: /* Requests forwarding of X11 connections. This should be called on the
513: client only. */
514: void x11_request_forwarding(void);
515:
516: /* Requests forwarding for X11 connections, with authentication spoofing.
517: This should be called in the client only. */
1.3 provos 518: void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
1.1 deraadt 519:
520: /* Sends a message to the server to request authentication fd forwarding. */
521: void auth_request_forwarding(void);
522:
523: /* Returns the name of the forwarded authentication socket. Returns NULL
524: if there is no forwarded authentication socket. The returned value points
525: to a static buffer. */
526: char *auth_get_socket_name(void);
527:
528: /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
529: This starts forwarding authentication requests. */
530: void auth_input_request_forwarding(struct passwd *pw);
531:
532: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
533: void auth_input_open_request(void);
534:
535: /* Returns true if the given string matches the pattern (which may contain
536: ? and * as wildcards), and zero if it does not match. */
537: int match_pattern(const char *s, const char *pattern);
538:
539: /* Expands tildes in the file name. Returns data allocated by xmalloc.
540: Warning: this calls getpw*. */
541: char *tilde_expand_filename(const char *filename, uid_t my_uid);
542:
543: /* Performs the interactive session. This handles data transmission between
544: the client and the program. Note that the notion of stdin, stdout, and
545: stderr in this function is sort of reversed: this function writes to
546: stdin (of the child program), and reads from stdout and stderr (of the
547: child program). */
548: void server_loop(int pid, int fdin, int fdout, int fderr);
549:
550: /* Client side main loop for the interactive session. */
551: int client_loop(int have_pty, int escape_char);
552:
553: /* Linked list of custom environment strings (see auth-rsa.c). */
554: struct envstring {
555: struct envstring *next;
556: char *s;
557: };
558:
559: #ifdef KRB4
560: #include <krb.h>
561:
1.4 dugsong 562: /* Performs Kerberos v4 mutual authentication with the client. This returns
563: 0 if the client could not be authenticated, and 1 if authentication was
564: successful. This may exit if there is a serious protocol violation. */
565: int auth_krb4(const char *server_user, KTEXT auth, char **client);
1.17 markus 566: int krb4_init(uid_t uid);
567: void krb4_cleanup_proc(void *ignore);
1.4 dugsong 568:
569: #ifdef AFS
570: #include <kafs.h>
571:
572: /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
1.1 deraadt 573: int auth_kerberos_tgt(struct passwd *pw, const char *string);
1.16 markus 574: int auth_afs_token(struct passwd *pw, const char *token_string);
1.1 deraadt 575:
576: int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
577: int radix_to_creds(const char *buf, CREDENTIALS *creds);
1.4 dugsong 578: #endif /* AFS */
1.1 deraadt 579:
580: #endif /* KRB4 */
1.9 markus 581:
582: #ifdef SKEY
583: #include <skey.h>
584: char *skey_fake_keyinfo(char *username);
585: #endif /* SKEY */
1.1 deraadt 586:
587: #endif /* SSH_H */
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