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8efc0c15 | 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("$Id$"); */ | |
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 */ |