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Diffstat (limited to 'ssh.h')
-rw-r--r-- | ssh.h | 589 |
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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 | |||
16 | /* RCSID("$Id: ssh.h,v 1.1 1999/10/27 03:42:45 damien Exp $"); */ | ||
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 5 | ||
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 | |||
54 | #ifndef ETCDIR | ||
55 | #define ETCDIR "/etc" | ||
56 | #endif /* ETCDIR */ | ||
57 | |||
58 | #define PIDDIR "/var/run" | ||
59 | |||
60 | /* System-wide file containing host keys of known hosts. This file should be | ||
61 | world-readable. */ | ||
62 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" | ||
63 | |||
64 | /* HOST_KEY_FILE /etc/ssh_host_key, | ||
65 | SERVER_CONFIG_FILE /etc/sshd_config, | ||
66 | and HOST_CONFIG_FILE /etc/ssh_config | ||
67 | are all defined in Makefile.in. Of these, ssh_host_key should be readable | ||
68 | only by root, whereas ssh_config should be world-readable. */ | ||
69 | |||
70 | #define HOST_KEY_FILE ETCDIR "/ssh_host_key" | ||
71 | #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" | ||
72 | #define HOST_CONFIG_FILE ETCDIR "/ssh_config" | ||
73 | |||
74 | #define SSH_PROGRAM "/usr/bin/ssh" | ||
75 | |||
76 | /* The process id of the daemon listening for connections is saved | ||
77 | here to make it easier to kill the correct daemon when necessary. */ | ||
78 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" | ||
79 | |||
80 | /* The directory in user\'s home directory in which the files reside. | ||
81 | The directory should be world-readable (though not all files are). */ | ||
82 | #define SSH_USER_DIR ".ssh" | ||
83 | |||
84 | /* Per-user file containing host keys of known hosts. This file need | ||
85 | not be readable by anyone except the user him/herself, though this does | ||
86 | not contain anything particularly secret. */ | ||
87 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" | ||
88 | |||
89 | /* Name of the default file containing client-side authentication key. | ||
90 | This file should only be readable by the user him/herself. */ | ||
91 | #define SSH_CLIENT_IDENTITY ".ssh/identity" | ||
92 | |||
93 | /* Configuration file in user\'s home directory. This file need not be | ||
94 | readable by anyone but the user him/herself, but does not contain | ||
95 | anything particularly secret. If the user\'s home directory resides | ||
96 | on an NFS volume where root is mapped to nobody, this may need to be | ||
97 | world-readable. */ | ||
98 | #define SSH_USER_CONFFILE ".ssh/config" | ||
99 | |||
100 | /* File containing a list of those rsa keys that permit logging in as | ||
101 | this user. This file need not be | ||
102 | readable by anyone but the user him/herself, but does not contain | ||
103 | anything particularly secret. If the user\'s home directory resides | ||
104 | on an NFS volume where root is mapped to nobody, this may need to be | ||
105 | world-readable. (This file is read by the daemon which is running as | ||
106 | root.) */ | ||
107 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" | ||
108 | |||
109 | /* Per-user and system-wide ssh "rc" files. These files are executed with | ||
110 | /bin/sh before starting the shell or command if they exist. They | ||
111 | will be passed "proto cookie" as arguments if X11 forwarding with | ||
112 | spoofing is in use. xauth will be run if neither of these exists. */ | ||
113 | #define SSH_USER_RC ".ssh/rc" | ||
114 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" | ||
115 | |||
116 | /* Ssh-only version of /etc/hosts.equiv. */ | ||
117 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" | ||
118 | |||
119 | /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if | ||
120 | rhosts authentication is enabled. */ | ||
121 | |||
122 | /* Name of the environment variable containing the pathname of the | ||
123 | authentication socket. */ | ||
124 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" | ||
125 | |||
126 | /* Force host key length and server key length to differ by at least this | ||
127 | many bits. This is to make double encryption with rsaref work. */ | ||
128 | #define SSH_KEY_BITS_RESERVED 128 | ||
129 | |||
130 | /* Length of the session key in bytes. (Specified as 256 bits in the | ||
131 | protocol.) */ | ||
132 | #define SSH_SESSION_KEY_LENGTH 32 | ||
133 | |||
134 | /* Name of Kerberos service for SSH to use. */ | ||
135 | #define KRB4_SERVICE_NAME "rcmd" | ||
136 | |||
137 | /* Authentication methods. New types can be added, but old types should not | ||
138 | be removed for compatibility. The maximum allowed value is 31. */ | ||
139 | #define SSH_AUTH_RHOSTS 1 | ||
140 | #define SSH_AUTH_RSA 2 | ||
141 | #define SSH_AUTH_PASSWORD 3 | ||
142 | #define SSH_AUTH_RHOSTS_RSA 4 | ||
143 | /* 5 is TIS */ | ||
144 | #define SSH_AUTH_KERBEROS 6 | ||
145 | #define SSH_PASS_KERBEROS_TGT 7 | ||
146 | /* 8 to 15 are reserved */ | ||
147 | #define SSH_PASS_AFS_TOKEN 21 | ||
148 | |||
149 | /* Protocol flags. These are bit masks. */ | ||
150 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ | ||
151 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ | ||
152 | |||
153 | /* Definition of message types. New values can be added, but old values | ||
154 | should not be removed or without careful consideration of the consequences | ||
155 | for compatibility. The maximum value is 254; value 255 is reserved | ||
156 | for future extension. */ | ||
157 | /* Message name */ /* msg code */ /* arguments */ | ||
158 | #define SSH_MSG_NONE 0 /* no message */ | ||
159 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ | ||
160 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ | ||
161 | #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ | ||
162 | #define SSH_CMSG_USER 4 /* user (string) */ | ||
163 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ | ||
164 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ | ||
165 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ | ||
166 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ | ||
167 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ | ||
168 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ | ||
169 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ | ||
170 | #define SSH_CMSG_EXEC_SHELL 12 /* */ | ||
171 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ | ||
172 | #define SSH_SMSG_SUCCESS 14 /* */ | ||
173 | #define SSH_SMSG_FAILURE 15 /* */ | ||
174 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ | ||
175 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ | ||
176 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ | ||
177 | #define SSH_CMSG_EOF 19 /* */ | ||
178 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ | ||
179 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ | ||
180 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ | ||
181 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ | ||
182 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ | ||
183 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ | ||
184 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ | ||
185 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ | ||
186 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ | ||
187 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ | ||
188 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ | ||
189 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ | ||
190 | #define SSH_MSG_IGNORE 32 /* string */ | ||
191 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ | ||
192 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ | ||
193 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ | ||
194 | #define SSH_MSG_DEBUG 36 /* string */ | ||
195 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ | ||
196 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ | ||
197 | #define SSH_CMSG_AUTH_TIS 39 /* this is proto-1.5, but we ignore TIS */ | ||
198 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 | ||
199 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 | ||
200 | |||
201 | #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */ | ||
202 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */ | ||
203 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */ | ||
204 | #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ | ||
205 | |||
206 | |||
207 | /* Includes that need definitions above. */ | ||
208 | |||
209 | #include "readconf.h" | ||
210 | |||
211 | /*------------ definitions for login.c -------------*/ | ||
212 | |||
213 | /* Returns the time when the user last logged in. Returns 0 if the | ||
214 | information is not available. This must be called before record_login. | ||
215 | The host from which the user logged in is stored in buf. */ | ||
216 | unsigned long get_last_login_time(uid_t uid, const char *logname, | ||
217 | char *buf, unsigned int bufsize); | ||
218 | |||
219 | /* Records that the user has logged in. This does many things normally | ||
220 | done by login(1). */ | ||
221 | void record_login(int pid, const char *ttyname, const char *user, uid_t uid, | ||
222 | const char *host, struct sockaddr_in *addr); | ||
223 | |||
224 | /* Records that the user has logged out. This does many thigs normally | ||
225 | done by login(1) or init. */ | ||
226 | void record_logout(int pid, const char *ttyname); | ||
227 | |||
228 | /*------------ definitions for sshconnect.c ----------*/ | ||
229 | |||
230 | /* Opens a TCP/IP connection to the remote server on the given host. If | ||
231 | port is 0, the default port will be used. If anonymous is zero, | ||
232 | a privileged port will be allocated to make the connection. | ||
233 | This requires super-user privileges if anonymous is false. | ||
234 | Connection_attempts specifies the maximum number of tries, one per | ||
235 | second. This returns true on success, and zero on failure. If the | ||
236 | connection is successful, this calls packet_set_connection for the | ||
237 | connection. */ | ||
238 | int ssh_connect(const char *host, struct sockaddr_in *hostaddr, | ||
239 | int port, int connection_attempts, | ||
240 | int anonymous, uid_t original_real_uid, | ||
241 | const char *proxy_command); | ||
242 | |||
243 | /* Starts a dialog with the server, and authenticates the current user on the | ||
244 | server. This does not need any extra privileges. The basic connection | ||
245 | to the server must already have been established before this is called. | ||
246 | If login fails, this function prints an error and never returns. | ||
247 | This initializes the random state, and leaves it initialized (it will also | ||
248 | have references from the packet module). */ | ||
249 | void ssh_login(int host_key_valid, RSA *host_key, const char *host, | ||
250 | struct sockaddr_in *hostaddr, Options *options, | ||
251 | uid_t original_real_uid); | ||
252 | |||
253 | /*------------ Definitions for various authentication methods. -------*/ | ||
254 | |||
255 | /* Tries to authenticate the user using the .rhosts file. Returns true if | ||
256 | authentication succeeds. If ignore_rhosts is non-zero, this will not | ||
257 | consider .rhosts and .shosts (/etc/hosts.equiv will still be used). | ||
258 | If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */ | ||
259 | int auth_rhosts(struct passwd *pw, const char *client_user, | ||
260 | int ignore_rhosts, int strict_modes); | ||
261 | |||
262 | /* Tries to authenticate the user using the .rhosts file and the host using | ||
263 | its host key. Returns true if authentication succeeds. */ | ||
264 | int auth_rhosts_rsa(struct passwd *pw, const char *client_user, | ||
265 | unsigned int bits, BIGNUM *client_host_key_e, | ||
266 | BIGNUM *client_host_key_n, int ignore_rhosts, | ||
267 | int strict_modes); | ||
268 | |||
269 | /* Tries to authenticate the user using password. Returns true if | ||
270 | authentication succeeds. */ | ||
271 | int auth_password(struct passwd *pw, const char *password); | ||
272 | |||
273 | /* Performs the RSA authentication dialog with the client. This returns | ||
274 | 0 if the client could not be authenticated, and 1 if authentication was | ||
275 | successful. This may exit if there is a serious protocol violation. */ | ||
276 | int auth_rsa(struct passwd *pw, BIGNUM *client_n, int strict_modes); | ||
277 | |||
278 | /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer | ||
279 | over the key. Skips any whitespace at the beginning and at end. */ | ||
280 | int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n); | ||
281 | |||
282 | /* Returns the name of the machine at the other end of the socket. The | ||
283 | returned string should be freed by the caller. */ | ||
284 | char *get_remote_hostname(int socket); | ||
285 | |||
286 | /* Return the canonical name of the host in the other side of the current | ||
287 | connection (as returned by packet_get_connection). The host name is | ||
288 | cached, so it is efficient to call this several times. */ | ||
289 | const char *get_canonical_hostname(void); | ||
290 | |||
291 | /* Returns the remote IP address as an ascii string. The value need not be | ||
292 | freed by the caller. */ | ||
293 | const char *get_remote_ipaddr(void); | ||
294 | |||
295 | /* Returns the port number of the peer of the socket. */ | ||
296 | int get_peer_port(int sock); | ||
297 | |||
298 | /* Returns the port number of the remote host. */ | ||
299 | int get_remote_port(void); | ||
300 | |||
301 | /* Tries to match the host name (which must be in all lowercase) against the | ||
302 | comma-separated sequence of subpatterns (each possibly preceded by ! to | ||
303 | indicate negation). Returns true if there is a positive match; zero | ||
304 | otherwise. */ | ||
305 | int match_hostname(const char *host, const char *pattern, unsigned int len); | ||
306 | |||
307 | /* Checks whether the given host is already in the list of our known hosts. | ||
308 | Returns HOST_OK if the host is known and has the specified key, | ||
309 | HOST_NEW if the host is not known, and HOST_CHANGED if the host is known | ||
310 | but used to have a different host key. The host must be in all lowercase. */ | ||
311 | typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus; | ||
312 | HostStatus check_host_in_hostfile(const char *filename, | ||
313 | const char *host, unsigned int bits, | ||
314 | BIGNUM *e, BIGNUM *n, | ||
315 | BIGNUM *ke, BIGNUM *kn); | ||
316 | |||
317 | /* Appends an entry to the host file. Returns false if the entry | ||
318 | could not be appended. */ | ||
319 | int add_host_to_hostfile(const char *filename, const char *host, | ||
320 | unsigned int bits, BIGNUM *e, BIGNUM *n); | ||
321 | |||
322 | /* Performs the RSA authentication challenge-response dialog with the client, | ||
323 | and returns true (non-zero) if the client gave the correct answer to | ||
324 | our challenge; returns zero if the client gives a wrong answer. */ | ||
325 | int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n); | ||
326 | |||
327 | /* Reads a passphrase from /dev/tty with echo turned off. Returns the | ||
328 | passphrase (allocated with xmalloc). Exits if EOF is encountered. | ||
329 | If from_stdin is true, the passphrase will be read from stdin instead. */ | ||
330 | char *read_passphrase(const char *prompt, int from_stdin); | ||
331 | |||
332 | /* Saves the authentication (private) key in a file, encrypting it with | ||
333 | passphrase. The identification of the file (lowest 64 bits of n) | ||
334 | will precede the key to provide identification of the key without | ||
335 | needing a passphrase. */ | ||
336 | int save_private_key(const char *filename, const char *passphrase, | ||
337 | RSA *private_key, const char *comment); | ||
338 | |||
339 | /* Loads the public part of the key file (public key and comment). | ||
340 | Returns 0 if an error occurred; zero if the public key was successfully | ||
341 | read. The comment of the key is returned in comment_return if it is | ||
342 | non-NULL; the caller must free the value with xfree. */ | ||
343 | int load_public_key(const char *filename, RSA *pub, | ||
344 | char **comment_return); | ||
345 | |||
346 | /* Loads the private key from the file. Returns 0 if an error is encountered | ||
347 | (file does not exist or is not readable, or passphrase is bad). | ||
348 | This initializes the private key. The comment of the key is returned | ||
349 | in comment_return if it is non-NULL; the caller must free the value | ||
350 | with xfree. */ | ||
351 | int load_private_key(const char *filename, const char *passphrase, | ||
352 | RSA *private_key, char **comment_return); | ||
353 | |||
354 | /*------------ Definitions for logging. -----------------------*/ | ||
355 | |||
356 | /* Supported syslog facilities. */ | ||
357 | typedef enum | ||
358 | { | ||
359 | SYSLOG_FACILITY_DAEMON, | ||
360 | SYSLOG_FACILITY_USER, | ||
361 | SYSLOG_FACILITY_AUTH, | ||
362 | SYSLOG_FACILITY_LOCAL0, | ||
363 | SYSLOG_FACILITY_LOCAL1, | ||
364 | SYSLOG_FACILITY_LOCAL2, | ||
365 | SYSLOG_FACILITY_LOCAL3, | ||
366 | SYSLOG_FACILITY_LOCAL4, | ||
367 | SYSLOG_FACILITY_LOCAL5, | ||
368 | SYSLOG_FACILITY_LOCAL6, | ||
369 | SYSLOG_FACILITY_LOCAL7 | ||
370 | } SyslogFacility; | ||
371 | |||
372 | /* Initializes logging. If debug is non-zero, debug() will output something. | ||
373 | If quiet is non-zero, none of these will log send anything to syslog | ||
374 | (but maybe to stderr). */ | ||
375 | void log_init(char *av0, int on_stderr, int debug, int quiet, | ||
376 | SyslogFacility facility); | ||
377 | |||
378 | /* Outputs a message to syslog or stderr, depending on the implementation. | ||
379 | The format must guarantee that the final message does not exceed 1024 | ||
380 | characters. The message should not contain newline. */ | ||
381 | void log(const char *fmt, ...); | ||
382 | |||
383 | /* Outputs a message to syslog or stderr, depending on the implementation. | ||
384 | The format must guarantee that the final message does not exceed 1024 | ||
385 | characters. The message should not contain newline. */ | ||
386 | void debug(const char *fmt, ...); | ||
387 | |||
388 | /* Outputs a message to syslog or stderr, depending on the implementation. | ||
389 | The format must guarantee that the final message does not exceed 1024 | ||
390 | characters. The message should not contain newline. */ | ||
391 | void error(const char *fmt, ...); | ||
392 | |||
393 | /* Outputs a message to syslog or stderr, depending on the implementation. | ||
394 | The format must guarantee that the final message does not exceed 1024 | ||
395 | characters. The message should not contain newline. | ||
396 | This call never returns. */ | ||
397 | void fatal(const char *fmt, ...); | ||
398 | |||
399 | /* Registers a cleanup function to be called by fatal() before exiting. | ||
400 | It is permissible to call fatal_remove_cleanup for the function itself | ||
401 | from the function. */ | ||
402 | void fatal_add_cleanup(void (*proc)(void *context), void *context); | ||
403 | |||
404 | /* Removes a cleanup frunction to be called at fatal(). */ | ||
405 | void fatal_remove_cleanup(void (*proc)(void *context), void *context); | ||
406 | |||
407 | /*---------------- definitions for channels ------------------*/ | ||
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. */ | ||
518 | void x11_request_forwarding_with_spoofing(const char *proto, const char *data); | ||
519 | |||
520 | /* Local Xauthority file (server only). */ | ||
521 | extern char *xauthfile; | ||
522 | |||
523 | /* Sends a message to the server to request authentication fd forwarding. */ | ||
524 | void auth_request_forwarding(void); | ||
525 | |||
526 | /* Returns the name of the forwarded authentication socket. Returns NULL | ||
527 | if there is no forwarded authentication socket. The returned value points | ||
528 | to a static buffer. */ | ||
529 | char *auth_get_socket_name(void); | ||
530 | |||
531 | /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. | ||
532 | This starts forwarding authentication requests. */ | ||
533 | void auth_input_request_forwarding(struct passwd *pw); | ||
534 | |||
535 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | ||
536 | void auth_input_open_request(void); | ||
537 | |||
538 | /* Returns true if the given string matches the pattern (which may contain | ||
539 | ? and * as wildcards), and zero if it does not match. */ | ||
540 | int match_pattern(const char *s, const char *pattern); | ||
541 | |||
542 | /* Expands tildes in the file name. Returns data allocated by xmalloc. | ||
543 | Warning: this calls getpw*. */ | ||
544 | char *tilde_expand_filename(const char *filename, uid_t my_uid); | ||
545 | |||
546 | /* Performs the interactive session. This handles data transmission between | ||
547 | the client and the program. Note that the notion of stdin, stdout, and | ||
548 | stderr in this function is sort of reversed: this function writes to | ||
549 | stdin (of the child program), and reads from stdout and stderr (of the | ||
550 | child program). */ | ||
551 | void server_loop(int pid, int fdin, int fdout, int fderr); | ||
552 | |||
553 | /* Client side main loop for the interactive session. */ | ||
554 | int client_loop(int have_pty, int escape_char); | ||
555 | |||
556 | /* Linked list of custom environment strings (see auth-rsa.c). */ | ||
557 | struct envstring { | ||
558 | struct envstring *next; | ||
559 | char *s; | ||
560 | }; | ||
561 | |||
562 | #ifdef KRB4 | ||
563 | #include <krb.h> | ||
564 | |||
565 | /* Performs Kerberos v4 mutual authentication with the client. This returns | ||
566 | 0 if the client could not be authenticated, and 1 if authentication was | ||
567 | successful. This may exit if there is a serious protocol violation. */ | ||
568 | int auth_krb4(const char *server_user, KTEXT auth, char **client); | ||
569 | int ssh_tf_init(uid_t uid); | ||
570 | |||
571 | #ifdef AFS | ||
572 | #include <kafs.h> | ||
573 | |||
574 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ | ||
575 | int auth_kerberos_tgt(struct passwd *pw, const char *string); | ||
576 | int auth_afs_token(char *server_user, uid_t uid, const char *string); | ||
577 | |||
578 | int creds_to_radix(CREDENTIALS *creds, unsigned char *buf); | ||
579 | int radix_to_creds(const char *buf, CREDENTIALS *creds); | ||
580 | #endif /* AFS */ | ||
581 | |||
582 | #endif /* KRB4 */ | ||
583 | |||
584 | #ifdef SKEY | ||
585 | #include <skey.h> | ||
586 | char *skey_fake_keyinfo(char *username); | ||
587 | #endif /* SKEY */ | ||
588 | |||
589 | #endif /* SSH_H */ | ||