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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 | ||
5881cd60 | 21 | /* Added by Dan */ |
22 | #ifndef SHUT_RDWR | |
23 | enum | |
24 | { | |
25 | SHUT_RD = 0, /* No more receptions. */ | |
26 | #define SHUT_RD SHUT_RD | |
27 | SHUT_WR, /* No more transmissions. */ | |
28 | #define SHUT_WR SHUT_WR | |
29 | SHUT_RDWR /* No more receptions or transmissions. */ | |
30 | #define SHUT_RDWR SHUT_RDWR | |
31 | }; | |
32 | #endif | |
33 | ||
34 | ||
8efc0c15 | 35 | #include "rsa.h" |
36 | #include "cipher.h" | |
37 | ||
38 | /* The default cipher used if IDEA is not supported by the remote host. | |
39 | It is recommended that this be one of the mandatory ciphers (DES, 3DES), | |
40 | though that is not required. */ | |
41 | #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES | |
42 | ||
43 | /* Cipher used for encrypting authentication files. */ | |
44 | #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES | |
45 | ||
46 | /* Default port number. */ | |
47 | #define SSH_DEFAULT_PORT 22 | |
48 | ||
49 | /* Maximum number of TCP/IP ports forwarded per direction. */ | |
50 | #define SSH_MAX_FORWARDS_PER_DIRECTION 100 | |
51 | ||
52 | /* Maximum number of RSA authentication identity files that can be specified | |
53 | in configuration files or on the command line. */ | |
54 | #define SSH_MAX_IDENTITY_FILES 100 | |
55 | ||
56 | /* Major protocol version. Different version indicates major incompatiblity | |
57 | that prevents communication. */ | |
58 | #define PROTOCOL_MAJOR 1 | |
59 | ||
60 | /* Minor protocol version. Different version indicates minor incompatibility | |
61 | that does not prevent interoperation. */ | |
62 | #define PROTOCOL_MINOR 5 | |
63 | ||
64 | /* Name for the service. The port named by this service overrides the default | |
65 | port if present. */ | |
66 | #define SSH_SERVICE_NAME "ssh" | |
67 | ||
68 | #ifndef ETCDIR | |
69 | #define ETCDIR "/etc" | |
70 | #endif /* ETCDIR */ | |
71 | ||
72 | #define PIDDIR "/var/run" | |
73 | ||
74 | /* System-wide file containing host keys of known hosts. This file should be | |
75 | world-readable. */ | |
76 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" | |
77 | ||
78 | /* HOST_KEY_FILE /etc/ssh_host_key, | |
79 | SERVER_CONFIG_FILE /etc/sshd_config, | |
80 | and HOST_CONFIG_FILE /etc/ssh_config | |
81 | are all defined in Makefile.in. Of these, ssh_host_key should be readable | |
82 | only by root, whereas ssh_config should be world-readable. */ | |
83 | ||
84 | #define HOST_KEY_FILE ETCDIR "/ssh_host_key" | |
85 | #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" | |
86 | #define HOST_CONFIG_FILE ETCDIR "/ssh_config" | |
87 | ||
e1a9c08d | 88 | #ifndef SSH_PROGRAM |
8efc0c15 | 89 | #define SSH_PROGRAM "/usr/bin/ssh" |
e1a9c08d | 90 | #endif /* SSH_PROGRAM */ |
91 | ||
92 | #ifndef LOGIN_PROGRAM | |
93 | #define LOGIN_PROGRAM "/usr/bin/login" | |
94 | #endif /* LOGIN_PROGRAM */ | |
8efc0c15 | 95 | |
96 | /* The process id of the daemon listening for connections is saved | |
97 | here to make it easier to kill the correct daemon when necessary. */ | |
f1bcacf9 | 98 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" |
8efc0c15 | 99 | |
100 | /* The directory in user\'s home directory in which the files reside. | |
101 | The directory should be world-readable (though not all files are). */ | |
102 | #define SSH_USER_DIR ".ssh" | |
103 | ||
104 | /* Per-user file containing host keys of known hosts. This file need | |
105 | not be readable by anyone except the user him/herself, though this does | |
106 | not contain anything particularly secret. */ | |
107 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" | |
108 | ||
109 | /* Name of the default file containing client-side authentication key. | |
110 | This file should only be readable by the user him/herself. */ | |
111 | #define SSH_CLIENT_IDENTITY ".ssh/identity" | |
112 | ||
113 | /* Configuration file in user\'s home directory. This file need not be | |
114 | readable by anyone but the user him/herself, but does not contain | |
115 | anything particularly secret. If the user\'s home directory resides | |
116 | on an NFS volume where root is mapped to nobody, this may need to be | |
117 | world-readable. */ | |
118 | #define SSH_USER_CONFFILE ".ssh/config" | |
119 | ||
120 | /* File containing a list of those rsa keys that permit logging in as | |
121 | this user. This file need not be | |
122 | readable by anyone but the user him/herself, but does not contain | |
123 | anything particularly secret. If the user\'s home directory resides | |
124 | on an NFS volume where root is mapped to nobody, this may need to be | |
125 | world-readable. (This file is read by the daemon which is running as | |
126 | root.) */ | |
127 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" | |
128 | ||
129 | /* Per-user and system-wide ssh "rc" files. These files are executed with | |
130 | /bin/sh before starting the shell or command if they exist. They | |
131 | will be passed "proto cookie" as arguments if X11 forwarding with | |
132 | spoofing is in use. xauth will be run if neither of these exists. */ | |
133 | #define SSH_USER_RC ".ssh/rc" | |
134 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" | |
135 | ||
136 | /* Ssh-only version of /etc/hosts.equiv. */ | |
137 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" | |
138 | ||
139 | /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if | |
140 | rhosts authentication is enabled. */ | |
141 | ||
142 | /* Name of the environment variable containing the pathname of the | |
143 | authentication socket. */ | |
144 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" | |
145 | ||
50da1126 | 146 | /* Name of the environment variable containing the pathname of the |
147 | authentication socket. */ | |
148 | #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" | |
149 | ||
8efc0c15 | 150 | /* Force host key length and server key length to differ by at least this |
151 | many bits. This is to make double encryption with rsaref work. */ | |
152 | #define SSH_KEY_BITS_RESERVED 128 | |
153 | ||
154 | /* Length of the session key in bytes. (Specified as 256 bits in the | |
155 | protocol.) */ | |
156 | #define SSH_SESSION_KEY_LENGTH 32 | |
157 | ||
158 | /* Name of Kerberos service for SSH to use. */ | |
159 | #define KRB4_SERVICE_NAME "rcmd" | |
160 | ||
161 | /* Authentication methods. New types can be added, but old types should not | |
162 | be removed for compatibility. The maximum allowed value is 31. */ | |
163 | #define SSH_AUTH_RHOSTS 1 | |
164 | #define SSH_AUTH_RSA 2 | |
165 | #define SSH_AUTH_PASSWORD 3 | |
166 | #define SSH_AUTH_RHOSTS_RSA 4 | |
167 | /* 5 is TIS */ | |
168 | #define SSH_AUTH_KERBEROS 6 | |
169 | #define SSH_PASS_KERBEROS_TGT 7 | |
170 | /* 8 to 15 are reserved */ | |
171 | #define SSH_PASS_AFS_TOKEN 21 | |
172 | ||
173 | /* Protocol flags. These are bit masks. */ | |
174 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ | |
175 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ | |
176 | ||
177 | /* Definition of message types. New values can be added, but old values | |
178 | should not be removed or without careful consideration of the consequences | |
179 | for compatibility. The maximum value is 254; value 255 is reserved | |
180 | for future extension. */ | |
181 | /* Message name */ /* msg code */ /* arguments */ | |
182 | #define SSH_MSG_NONE 0 /* no message */ | |
183 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ | |
184 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ | |
185 | #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ | |
186 | #define SSH_CMSG_USER 4 /* user (string) */ | |
187 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ | |
188 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ | |
189 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ | |
190 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ | |
191 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ | |
192 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ | |
193 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ | |
194 | #define SSH_CMSG_EXEC_SHELL 12 /* */ | |
195 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ | |
196 | #define SSH_SMSG_SUCCESS 14 /* */ | |
197 | #define SSH_SMSG_FAILURE 15 /* */ | |
198 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ | |
199 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ | |
200 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ | |
201 | #define SSH_CMSG_EOF 19 /* */ | |
202 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ | |
203 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ | |
204 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ | |
205 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ | |
206 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ | |
207 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ | |
208 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ | |
209 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ | |
210 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ | |
211 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ | |
212 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ | |
213 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ | |
214 | #define SSH_MSG_IGNORE 32 /* string */ | |
215 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ | |
216 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ | |
217 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ | |
218 | #define SSH_MSG_DEBUG 36 /* string */ | |
219 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ | |
220 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ | |
221 | #define SSH_CMSG_AUTH_TIS 39 /* this is proto-1.5, but we ignore TIS */ | |
222 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 | |
223 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 | |
224 | ||
225 | #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */ | |
226 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */ | |
227 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */ | |
228 | #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ | |
229 | ||
230 | ||
231 | /* Includes that need definitions above. */ | |
232 | ||
233 | #include "readconf.h" | |
234 | ||
235 | /*------------ definitions for login.c -------------*/ | |
236 | ||
237 | /* Returns the time when the user last logged in. Returns 0 if the | |
238 | information is not available. This must be called before record_login. | |
239 | The host from which the user logged in is stored in buf. */ | |
240 | unsigned long get_last_login_time(uid_t uid, const char *logname, | |
241 | char *buf, unsigned int bufsize); | |
242 | ||
243 | /* Records that the user has logged in. This does many things normally | |
244 | done by login(1). */ | |
245 | void record_login(int pid, const char *ttyname, const char *user, uid_t uid, | |
246 | const char *host, struct sockaddr_in *addr); | |
247 | ||
248 | /* Records that the user has logged out. This does many thigs normally | |
249 | done by login(1) or init. */ | |
250 | void record_logout(int pid, const char *ttyname); | |
251 | ||
252 | /*------------ definitions for sshconnect.c ----------*/ | |
253 | ||
254 | /* Opens a TCP/IP connection to the remote server on the given host. If | |
255 | port is 0, the default port will be used. If anonymous is zero, | |
256 | a privileged port will be allocated to make the connection. | |
257 | This requires super-user privileges if anonymous is false. | |
258 | Connection_attempts specifies the maximum number of tries, one per | |
259 | second. This returns true on success, and zero on failure. If the | |
260 | connection is successful, this calls packet_set_connection for the | |
261 | connection. */ | |
262 | int ssh_connect(const char *host, struct sockaddr_in *hostaddr, | |
263 | int port, int connection_attempts, | |
264 | int anonymous, uid_t original_real_uid, | |
265 | const char *proxy_command); | |
266 | ||
267 | /* Starts a dialog with the server, and authenticates the current user on the | |
268 | server. This does not need any extra privileges. The basic connection | |
269 | to the server must already have been established before this is called. | |
270 | If login fails, this function prints an error and never returns. | |
271 | This initializes the random state, and leaves it initialized (it will also | |
272 | have references from the packet module). */ | |
273 | void ssh_login(int host_key_valid, RSA *host_key, const char *host, | |
274 | struct sockaddr_in *hostaddr, Options *options, | |
275 | uid_t original_real_uid); | |
276 | ||
277 | /*------------ Definitions for various authentication methods. -------*/ | |
278 | ||
279 | /* Tries to authenticate the user using the .rhosts file. Returns true if | |
280 | authentication succeeds. If ignore_rhosts is non-zero, this will not | |
281 | consider .rhosts and .shosts (/etc/hosts.equiv will still be used). | |
282 | If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */ | |
283 | int auth_rhosts(struct passwd *pw, const char *client_user, | |
284 | int ignore_rhosts, int strict_modes); | |
285 | ||
286 | /* Tries to authenticate the user using the .rhosts file and the host using | |
287 | its host key. Returns true if authentication succeeds. */ | |
288 | int auth_rhosts_rsa(struct passwd *pw, const char *client_user, | |
289 | unsigned int bits, BIGNUM *client_host_key_e, | |
290 | BIGNUM *client_host_key_n, int ignore_rhosts, | |
291 | int strict_modes); | |
292 | ||
293 | /* Tries to authenticate the user using password. Returns true if | |
294 | authentication succeeds. */ | |
295 | int auth_password(struct passwd *pw, const char *password); | |
296 | ||
297 | /* Performs the RSA authentication dialog with the client. This returns | |
298 | 0 if the client could not be authenticated, and 1 if authentication was | |
299 | successful. This may exit if there is a serious protocol violation. */ | |
300 | int auth_rsa(struct passwd *pw, BIGNUM *client_n, int strict_modes); | |
301 | ||
302 | /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer | |
303 | over the key. Skips any whitespace at the beginning and at end. */ | |
304 | int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n); | |
305 | ||
306 | /* Returns the name of the machine at the other end of the socket. The | |
307 | returned string should be freed by the caller. */ | |
308 | char *get_remote_hostname(int socket); | |
309 | ||
310 | /* Return the canonical name of the host in the other side of the current | |
311 | connection (as returned by packet_get_connection). The host name is | |
312 | cached, so it is efficient to call this several times. */ | |
313 | const char *get_canonical_hostname(void); | |
314 | ||
315 | /* Returns the remote IP address as an ascii string. The value need not be | |
316 | freed by the caller. */ | |
317 | const char *get_remote_ipaddr(void); | |
318 | ||
319 | /* Returns the port number of the peer of the socket. */ | |
320 | int get_peer_port(int sock); | |
321 | ||
322 | /* Returns the port number of the remote host. */ | |
323 | int get_remote_port(void); | |
324 | ||
325 | /* Tries to match the host name (which must be in all lowercase) against the | |
326 | comma-separated sequence of subpatterns (each possibly preceded by ! to | |
327 | indicate negation). Returns true if there is a positive match; zero | |
328 | otherwise. */ | |
329 | int match_hostname(const char *host, const char *pattern, unsigned int len); | |
330 | ||
331 | /* Checks whether the given host is already in the list of our known hosts. | |
332 | Returns HOST_OK if the host is known and has the specified key, | |
333 | HOST_NEW if the host is not known, and HOST_CHANGED if the host is known | |
334 | but used to have a different host key. The host must be in all lowercase. */ | |
335 | typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus; | |
336 | HostStatus check_host_in_hostfile(const char *filename, | |
337 | const char *host, unsigned int bits, | |
338 | BIGNUM *e, BIGNUM *n, | |
339 | BIGNUM *ke, BIGNUM *kn); | |
340 | ||
341 | /* Appends an entry to the host file. Returns false if the entry | |
342 | could not be appended. */ | |
343 | int add_host_to_hostfile(const char *filename, const char *host, | |
344 | unsigned int bits, BIGNUM *e, BIGNUM *n); | |
345 | ||
346 | /* Performs the RSA authentication challenge-response dialog with the client, | |
347 | and returns true (non-zero) if the client gave the correct answer to | |
348 | our challenge; returns zero if the client gives a wrong answer. */ | |
349 | int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n); | |
350 | ||
351 | /* Reads a passphrase from /dev/tty with echo turned off. Returns the | |
352 | passphrase (allocated with xmalloc). Exits if EOF is encountered. | |
353 | If from_stdin is true, the passphrase will be read from stdin instead. */ | |
354 | char *read_passphrase(const char *prompt, int from_stdin); | |
355 | ||
356 | /* Saves the authentication (private) key in a file, encrypting it with | |
357 | passphrase. The identification of the file (lowest 64 bits of n) | |
358 | will precede the key to provide identification of the key without | |
359 | needing a passphrase. */ | |
360 | int save_private_key(const char *filename, const char *passphrase, | |
361 | RSA *private_key, const char *comment); | |
362 | ||
363 | /* Loads the public part of the key file (public key and comment). | |
364 | Returns 0 if an error occurred; zero if the public key was successfully | |
365 | read. The comment of the key is returned in comment_return if it is | |
366 | non-NULL; the caller must free the value with xfree. */ | |
367 | int load_public_key(const char *filename, RSA *pub, | |
368 | char **comment_return); | |
369 | ||
370 | /* Loads the private key from the file. Returns 0 if an error is encountered | |
371 | (file does not exist or is not readable, or passphrase is bad). | |
372 | This initializes the private key. The comment of the key is returned | |
373 | in comment_return if it is non-NULL; the caller must free the value | |
374 | with xfree. */ | |
375 | int load_private_key(const char *filename, const char *passphrase, | |
376 | RSA *private_key, char **comment_return); | |
377 | ||
378 | /*------------ Definitions for logging. -----------------------*/ | |
379 | ||
380 | /* Supported syslog facilities. */ | |
381 | typedef enum | |
382 | { | |
383 | SYSLOG_FACILITY_DAEMON, | |
384 | SYSLOG_FACILITY_USER, | |
385 | SYSLOG_FACILITY_AUTH, | |
386 | SYSLOG_FACILITY_LOCAL0, | |
387 | SYSLOG_FACILITY_LOCAL1, | |
388 | SYSLOG_FACILITY_LOCAL2, | |
389 | SYSLOG_FACILITY_LOCAL3, | |
390 | SYSLOG_FACILITY_LOCAL4, | |
391 | SYSLOG_FACILITY_LOCAL5, | |
392 | SYSLOG_FACILITY_LOCAL6, | |
393 | SYSLOG_FACILITY_LOCAL7 | |
394 | } SyslogFacility; | |
395 | ||
396 | /* Initializes logging. If debug is non-zero, debug() will output something. | |
397 | If quiet is non-zero, none of these will log send anything to syslog | |
398 | (but maybe to stderr). */ | |
399 | void log_init(char *av0, int on_stderr, int debug, int quiet, | |
400 | SyslogFacility facility); | |
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 log(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 | void debug(const char *fmt, ...); | |
411 | ||
412 | /* Outputs a message to syslog or stderr, depending on the implementation. | |
413 | The format must guarantee that the final message does not exceed 1024 | |
414 | characters. The message should not contain newline. */ | |
415 | void error(const char *fmt, ...); | |
416 | ||
417 | /* Outputs a message to syslog or stderr, depending on the implementation. | |
418 | The format must guarantee that the final message does not exceed 1024 | |
419 | characters. The message should not contain newline. | |
420 | This call never returns. */ | |
421 | void fatal(const char *fmt, ...); | |
422 | ||
423 | /* Registers a cleanup function to be called by fatal() before exiting. | |
424 | It is permissible to call fatal_remove_cleanup for the function itself | |
425 | from the function. */ | |
426 | void fatal_add_cleanup(void (*proc)(void *context), void *context); | |
427 | ||
428 | /* Removes a cleanup frunction to be called at fatal(). */ | |
429 | void fatal_remove_cleanup(void (*proc)(void *context), void *context); | |
430 | ||
431 | /*---------------- definitions for channels ------------------*/ | |
432 | ||
433 | /* Sets specific protocol options. */ | |
434 | void channel_set_options(int hostname_in_open); | |
435 | ||
436 | /* Allocate a new channel object and set its type and socket. Remote_name | |
437 | must have been allocated with xmalloc; this will free it when the channel | |
438 | is freed. */ | |
439 | int channel_allocate(int type, int sock, char *remote_name); | |
440 | ||
441 | /* Free the channel and close its socket. */ | |
442 | void channel_free(int channel); | |
443 | ||
444 | /* Add any bits relevant to channels in select bitmasks. */ | |
445 | void channel_prepare_select(fd_set *readset, fd_set *writeset); | |
446 | ||
447 | /* After select, perform any appropriate operations for channels which | |
448 | have events pending. */ | |
449 | void channel_after_select(fd_set *readset, fd_set *writeset); | |
450 | ||
451 | /* If there is data to send to the connection, send some of it now. */ | |
452 | void channel_output_poll(void); | |
453 | ||
454 | /* This is called when a packet of type CHANNEL_DATA has just been received. | |
455 | The message type has already been consumed, but channel number and data | |
456 | is still there. */ | |
457 | void channel_input_data(int payload_len); | |
458 | ||
459 | /* Returns true if no channel has too much buffered data. */ | |
460 | int channel_not_very_much_buffered_data(void); | |
461 | ||
462 | /* This is called after receiving CHANNEL_CLOSE. */ | |
463 | void channel_input_close(void); | |
464 | ||
465 | /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */ | |
466 | void channel_input_close_confirmation(void); | |
467 | ||
468 | /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */ | |
469 | void channel_input_open_confirmation(void); | |
470 | ||
471 | /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */ | |
472 | void channel_input_open_failure(void); | |
473 | ||
474 | /* This closes any sockets that are listening for connections; this removes | |
475 | any unix domain sockets. */ | |
476 | void channel_stop_listening(void); | |
477 | ||
478 | /* Closes the sockets of all channels. This is used to close extra file | |
479 | descriptors after a fork. */ | |
480 | void channel_close_all(void); | |
481 | ||
482 | /* Returns the maximum file descriptor number used by the channels. */ | |
483 | int channel_max_fd(void); | |
484 | ||
485 | /* Returns true if there is still an open channel over the connection. */ | |
486 | int channel_still_open(void); | |
487 | ||
488 | /* Returns a string containing a list of all open channels. The list is | |
489 | suitable for displaying to the user. It uses crlf instead of newlines. | |
490 | The caller should free the string with xfree. */ | |
491 | char *channel_open_message(void); | |
492 | ||
493 | /* Initiate forwarding of connections to local port "port" through the secure | |
494 | channel to host:port from remote side. This never returns if there | |
495 | was an error. */ | |
496 | void channel_request_local_forwarding(int port, const char *host, | |
497 | int remote_port); | |
498 | ||
499 | /* Initiate forwarding of connections to port "port" on remote host through | |
500 | the secure channel to host:port from local side. This never returns | |
501 | if there was an error. This registers that open requests for that | |
502 | port are permitted. */ | |
503 | void channel_request_remote_forwarding(int port, const char *host, | |
504 | int remote_port); | |
505 | ||
506 | /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually | |
507 | called by the server, because the user could connect to any port anyway, | |
508 | and the server has no way to know but to trust the client anyway. */ | |
509 | void channel_permit_all_opens(void); | |
510 | ||
511 | /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates | |
512 | listening for the port, and sends back a success reply (or disconnect | |
513 | message if there was an error). This never returns if there was an | |
514 | error. */ | |
515 | void channel_input_port_forward_request(int is_root); | |
516 | ||
517 | /* This is called after receiving PORT_OPEN message. This attempts to connect | |
518 | to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or | |
519 | CHANNEL_OPEN_FAILURE. */ | |
520 | void channel_input_port_open(int payload_len); | |
521 | ||
522 | /* Creates a port for X11 connections, and starts listening for it. | |
523 | Returns the display name, or NULL if an error was encountered. */ | |
524 | char *x11_create_display(int screen); | |
525 | ||
526 | /* Creates an internet domain socket for listening for X11 connections. | |
527 | Returns a suitable value for the DISPLAY variable, or NULL if an error | |
528 | occurs. */ | |
529 | char *x11_create_display_inet(int screen); | |
530 | ||
531 | /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains | |
532 | the remote channel number. We should do whatever we want, and respond | |
533 | with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */ | |
534 | void x11_input_open(int payload_len); | |
535 | ||
536 | /* Requests forwarding of X11 connections. This should be called on the | |
537 | client only. */ | |
538 | void x11_request_forwarding(void); | |
539 | ||
540 | /* Requests forwarding for X11 connections, with authentication spoofing. | |
541 | This should be called in the client only. */ | |
542 | void x11_request_forwarding_with_spoofing(const char *proto, const char *data); | |
543 | ||
544 | /* Local Xauthority file (server only). */ | |
545 | extern char *xauthfile; | |
546 | ||
547 | /* Sends a message to the server to request authentication fd forwarding. */ | |
548 | void auth_request_forwarding(void); | |
549 | ||
550 | /* Returns the name of the forwarded authentication socket. Returns NULL | |
551 | if there is no forwarded authentication socket. The returned value points | |
552 | to a static buffer. */ | |
553 | char *auth_get_socket_name(void); | |
554 | ||
555 | /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. | |
556 | This starts forwarding authentication requests. */ | |
557 | void auth_input_request_forwarding(struct passwd *pw); | |
558 | ||
559 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ | |
560 | void auth_input_open_request(void); | |
561 | ||
562 | /* Returns true if the given string matches the pattern (which may contain | |
563 | ? and * as wildcards), and zero if it does not match. */ | |
564 | int match_pattern(const char *s, const char *pattern); | |
565 | ||
566 | /* Expands tildes in the file name. Returns data allocated by xmalloc. | |
567 | Warning: this calls getpw*. */ | |
568 | char *tilde_expand_filename(const char *filename, uid_t my_uid); | |
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 | ||
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); | |
593 | int ssh_tf_init(uid_t uid); | |
594 | ||
595 | #ifdef AFS | |
596 | #include <kafs.h> | |
597 | ||
598 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ | |
599 | int auth_kerberos_tgt(struct passwd *pw, const char *string); | |
5bae4ab8 | 600 | int auth_afs_token(struct passwd *pw, const char *token_string); |
8efc0c15 | 601 | |
602 | int creds_to_radix(CREDENTIALS *creds, unsigned char *buf); | |
603 | int radix_to_creds(const char *buf, CREDENTIALS *creds); | |
604 | #endif /* AFS */ | |
605 | ||
606 | #endif /* KRB4 */ | |
607 | ||
608 | #ifdef SKEY | |
609 | #include <skey.h> | |
610 | char *skey_fake_keyinfo(char *username); | |
611 | #endif /* SKEY */ | |
612 | ||
613 | #endif /* SSH_H */ |