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Commit | Line | Data |
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8efc0c15 | 1 | /* |
5260325f | 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 | */ | |
8efc0c15 | 15 | |
16 | /* RCSID("$Id$"); */ | |
17 | ||
18 | #ifndef SSH_H | |
19 | #define SSH_H | |
20 | ||
4cca272e | 21 | #include <netinet/in.h> /* For struct sockaddr_in */ |
22 | #include <pwd.h> /* For struct pw */ | |
6a17f9c2 | 23 | #include <stdarg.h> /* For va_list */ |
48e671d5 | 24 | #include <sys/socket.h> /* For struct sockaddr_storage */ |
25 | #include "fake-socket.h" /* For struct sockaddr_storage */ | |
eef6f7e9 | 26 | #ifdef HAVE_SYS_SELECT_H |
27 | # include <sys/select.h> | |
28 | #endif | |
8efc0c15 | 29 | #include "rsa.h" |
30 | #include "cipher.h" | |
31 | ||
aa3378df | 32 | /* |
33 | * The default cipher used if IDEA is not supported by the remote host. It is | |
34 | * recommended that this be one of the mandatory ciphers (DES, 3DES), though | |
35 | * that is not required. | |
36 | */ | |
8efc0c15 | 37 | #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES |
38 | ||
39 | /* Cipher used for encrypting authentication files. */ | |
40 | #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES | |
41 | ||
42 | /* Default port number. */ | |
43 | #define SSH_DEFAULT_PORT 22 | |
44 | ||
45 | /* Maximum number of TCP/IP ports forwarded per direction. */ | |
46 | #define SSH_MAX_FORWARDS_PER_DIRECTION 100 | |
47 | ||
aa3378df | 48 | /* |
49 | * Maximum number of RSA authentication identity files that can be specified | |
50 | * in configuration files or on the command line. | |
51 | */ | |
8efc0c15 | 52 | #define SSH_MAX_IDENTITY_FILES 100 |
53 | ||
aa3378df | 54 | /* |
55 | * Major protocol version. Different version indicates major incompatiblity | |
56 | * that prevents communication. | |
a8be9f80 | 57 | * |
aa3378df | 58 | * Minor protocol version. Different version indicates minor incompatibility |
59 | * that does not prevent interoperation. | |
60 | */ | |
a8be9f80 | 61 | #define PROTOCOL_MAJOR_1 1 |
62 | #define PROTOCOL_MINOR_1 5 | |
63 | ||
64 | /* We support both SSH1 and SSH2 */ | |
65 | #define PROTOCOL_MAJOR_2 2 | |
66 | #define PROTOCOL_MINOR_2 0 | |
8efc0c15 | 67 | |
aa3378df | 68 | /* |
69 | * Name for the service. The port named by this service overrides the | |
70 | * default port if present. | |
71 | */ | |
8efc0c15 | 72 | #define SSH_SERVICE_NAME "ssh" |
73 | ||
74 | #ifndef ETCDIR | |
75 | #define ETCDIR "/etc" | |
76 | #endif /* ETCDIR */ | |
77 | ||
5260325f | 78 | #ifndef PIDDIR |
8efc0c15 | 79 | #define PIDDIR "/var/run" |
5260325f | 80 | #endif /* PIDDIR */ |
8efc0c15 | 81 | |
aa3378df | 82 | /* |
83 | * System-wide file containing host keys of known hosts. This file should be | |
84 | * world-readable. | |
85 | */ | |
8efc0c15 | 86 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" |
87 | ||
aa3378df | 88 | /* |
89 | * Of these, ssh_host_key must be readable only by root, whereas ssh_config | |
90 | * should be world-readable. | |
91 | */ | |
8efc0c15 | 92 | #define HOST_KEY_FILE ETCDIR "/ssh_host_key" |
93 | #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" | |
94 | #define HOST_CONFIG_FILE ETCDIR "/ssh_config" | |
e78a59f5 | 95 | #define DSA_KEY_FILE ETCDIR "/ssh_dsa_key" |
8efc0c15 | 96 | |
e1a9c08d | 97 | #ifndef SSH_PROGRAM |
5260325f | 98 | #define SSH_PROGRAM "/usr/bin/ssh" |
e1a9c08d | 99 | #endif /* SSH_PROGRAM */ |
100 | ||
101 | #ifndef LOGIN_PROGRAM | |
5260325f | 102 | #define LOGIN_PROGRAM "/usr/bin/login" |
e1a9c08d | 103 | #endif /* LOGIN_PROGRAM */ |
8efc0c15 | 104 | |
d4f11b59 | 105 | #ifndef ASKPASS_PROGRAM |
5260325f | 106 | #define ASKPASS_PROGRAM "/usr/lib/ssh/ssh-askpass" |
d4f11b59 | 107 | #endif /* ASKPASS_PROGRAM */ |
108 | ||
aa3378df | 109 | /* |
110 | * The process id of the daemon listening for connections is saved here to | |
111 | * make it easier to kill the correct daemon when necessary. | |
112 | */ | |
f1bcacf9 | 113 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" |
8efc0c15 | 114 | |
aa3378df | 115 | /* |
116 | * The directory in user\'s home directory in which the files reside. The | |
117 | * directory should be world-readable (though not all files are). | |
118 | */ | |
8efc0c15 | 119 | #define SSH_USER_DIR ".ssh" |
120 | ||
aa3378df | 121 | /* |
122 | * Per-user file containing host keys of known hosts. This file need not be | |
123 | * readable by anyone except the user him/herself, though this does not | |
124 | * contain anything particularly secret. | |
125 | */ | |
8efc0c15 | 126 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" |
127 | ||
aa3378df | 128 | /* |
129 | * Name of the default file containing client-side authentication key. This | |
130 | * file should only be readable by the user him/herself. | |
131 | */ | |
8efc0c15 | 132 | #define SSH_CLIENT_IDENTITY ".ssh/identity" |
133 | ||
aa3378df | 134 | /* |
135 | * Configuration file in user\'s home directory. This file need not be | |
136 | * readable by anyone but the user him/herself, but does not contain anything | |
137 | * particularly secret. If the user\'s home directory resides on an NFS | |
138 | * volume where root is mapped to nobody, this may need to be world-readable. | |
139 | */ | |
8efc0c15 | 140 | #define SSH_USER_CONFFILE ".ssh/config" |
141 | ||
aa3378df | 142 | /* |
143 | * File containing a list of those rsa keys that permit logging in as this | |
144 | * user. This file need not be readable by anyone but the user him/herself, | |
145 | * but does not contain anything particularly secret. If the user\'s home | |
146 | * directory resides on an NFS volume where root is mapped to nobody, this | |
147 | * may need to be world-readable. (This file is read by the daemon which is | |
148 | * running as root.) | |
149 | */ | |
8efc0c15 | 150 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" |
151 | ||
aa3378df | 152 | /* |
153 | * Per-user and system-wide ssh "rc" files. These files are executed with | |
154 | * /bin/sh before starting the shell or command if they exist. They will be | |
155 | * passed "proto cookie" as arguments if X11 forwarding with spoofing is in | |
156 | * use. xauth will be run if neither of these exists. | |
157 | */ | |
8efc0c15 | 158 | #define SSH_USER_RC ".ssh/rc" |
159 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" | |
160 | ||
aa3378df | 161 | /* |
162 | * Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use | |
163 | * ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled. | |
164 | */ | |
8efc0c15 | 165 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" |
166 | ||
aa3378df | 167 | /* |
168 | * Name of the environment variable containing the pathname of the | |
169 | * authentication socket. | |
170 | */ | |
8efc0c15 | 171 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" |
172 | ||
aa3378df | 173 | /* |
174 | * Name of the environment variable containing the pathname of the | |
175 | * authentication socket. | |
176 | */ | |
b4748e2f | 177 | #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" |
50da1126 | 178 | |
57112b5a | 179 | /* |
180 | * Default path to ssh-askpass used by ssh-add, | |
181 | * environment variable for overwriting the default location | |
182 | */ | |
db28aeb5 | 183 | #ifndef SSH_ASKPASS_DEFAULT |
184 | # define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass" | |
185 | #endif | |
57112b5a | 186 | #define SSH_ASKPASS_ENV "SSH_ASKPASS" |
187 | ||
aa3378df | 188 | /* |
189 | * Force host key length and server key length to differ by at least this | |
190 | * many bits. This is to make double encryption with rsaref work. | |
191 | */ | |
8efc0c15 | 192 | #define SSH_KEY_BITS_RESERVED 128 |
193 | ||
aa3378df | 194 | /* |
195 | * Length of the session key in bytes. (Specified as 256 bits in the | |
196 | * protocol.) | |
197 | */ | |
8efc0c15 | 198 | #define SSH_SESSION_KEY_LENGTH 32 |
199 | ||
200 | /* Name of Kerberos service for SSH to use. */ | |
201 | #define KRB4_SERVICE_NAME "rcmd" | |
202 | ||
aa3378df | 203 | /* |
204 | * Authentication methods. New types can be added, but old types should not | |
205 | * be removed for compatibility. The maximum allowed value is 31. | |
206 | */ | |
8efc0c15 | 207 | #define SSH_AUTH_RHOSTS 1 |
208 | #define SSH_AUTH_RSA 2 | |
209 | #define SSH_AUTH_PASSWORD 3 | |
210 | #define SSH_AUTH_RHOSTS_RSA 4 | |
5260325f | 211 | #define SSH_AUTH_TIS 5 |
8efc0c15 | 212 | #define SSH_AUTH_KERBEROS 6 |
213 | #define SSH_PASS_KERBEROS_TGT 7 | |
aa3378df | 214 | /* 8 to 15 are reserved */ |
8efc0c15 | 215 | #define SSH_PASS_AFS_TOKEN 21 |
216 | ||
217 | /* Protocol flags. These are bit masks. */ | |
aa3378df | 218 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ |
219 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ | |
220 | ||
221 | /* | |
222 | * Definition of message types. New values can be added, but old values | |
223 | * should not be removed or without careful consideration of the consequences | |
224 | * for compatibility. The maximum value is 254; value 255 is reserved for | |
225 | * future extension. | |
226 | */ | |
227 | /* Message name */ /* msg code */ /* arguments */ | |
8efc0c15 | 228 | #define SSH_MSG_NONE 0 /* no message */ |
229 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ | |
230 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ | |
231 | #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ | |
232 | #define SSH_CMSG_USER 4 /* user (string) */ | |
233 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ | |
234 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ | |
235 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ | |
236 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ | |
237 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ | |
238 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ | |
239 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ | |
240 | #define SSH_CMSG_EXEC_SHELL 12 /* */ | |
241 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ | |
242 | #define SSH_SMSG_SUCCESS 14 /* */ | |
243 | #define SSH_SMSG_FAILURE 15 /* */ | |
244 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ | |
245 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ | |
246 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ | |
247 | #define SSH_CMSG_EOF 19 /* */ | |
248 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ | |
249 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ | |
250 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ | |
251 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ | |
252 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ | |
253 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ | |
254 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ | |
255 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ | |
256 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ | |
257 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ | |
258 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ | |
259 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ | |
260 | #define SSH_MSG_IGNORE 32 /* string */ | |
261 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ | |
262 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ | |
263 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ | |
264 | #define SSH_MSG_DEBUG 36 /* string */ | |
265 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ | |
266 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ | |
5260325f | 267 | #define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */ |
268 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */ | |
269 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */ | |
8efc0c15 | 270 | #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */ |
271 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */ | |
272 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */ | |
273 | #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ | |
274 | ||
8efc0c15 | 275 | /*------------ definitions for login.c -------------*/ |
276 | ||
aa3378df | 277 | /* |
278 | * Returns the time when the user last logged in. Returns 0 if the | |
279 | * information is not available. This must be called before record_login. | |
280 | * The host from which the user logged in is stored in buf. | |
281 | */ | |
5260325f | 282 | unsigned long |
283 | get_last_login_time(uid_t uid, const char *logname, | |
284 | char *buf, unsigned int bufsize); | |
8efc0c15 | 285 | |
aa3378df | 286 | /* |
287 | * Records that the user has logged in. This does many things normally done | |
288 | * by login(1). | |
289 | */ | |
5260325f | 290 | void |
291 | record_login(int pid, const char *ttyname, const char *user, uid_t uid, | |
48e671d5 | 292 | const char *host, struct sockaddr *addr); |
8efc0c15 | 293 | |
aa3378df | 294 | /* |
295 | * Records that the user has logged out. This does many thigs normally done | |
296 | * by login(1) or init. | |
297 | */ | |
5260325f | 298 | void record_logout(int pid, const char *ttyname); |
8efc0c15 | 299 | |
300 | /*------------ definitions for sshconnect.c ----------*/ | |
301 | ||
aa3378df | 302 | /* |
303 | * Opens a TCP/IP connection to the remote server on the given host. If port | |
304 | * is 0, the default port will be used. If anonymous is zero, a privileged | |
305 | * port will be allocated to make the connection. This requires super-user | |
306 | * privileges if anonymous is false. Connection_attempts specifies the | |
307 | * maximum number of tries, one per second. This returns true on success, | |
308 | * and zero on failure. If the connection is successful, this calls | |
309 | * packet_set_connection for the connection. | |
310 | */ | |
5260325f | 311 | int |
48e671d5 | 312 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
57112b5a | 313 | u_short port, int connection_attempts, |
5260325f | 314 | int anonymous, uid_t original_real_uid, |
315 | const char *proxy_command); | |
8efc0c15 | 316 | |
aa3378df | 317 | /* |
318 | * Starts a dialog with the server, and authenticates the current user on the | |
319 | * server. This does not need any extra privileges. The basic connection to | |
320 | * the server must already have been established before this is called. If | |
321 | * login fails, this function prints an error and never returns. This | |
322 | * initializes the random state, and leaves it initialized (it will also have | |
323 | * references from the packet module). | |
324 | */ | |
6a17f9c2 | 325 | |
5260325f | 326 | void |
327 | ssh_login(int host_key_valid, RSA * host_key, const char *host, | |
48e671d5 | 328 | struct sockaddr * hostaddr, uid_t original_real_uid); |
8efc0c15 | 329 | |
330 | /*------------ Definitions for various authentication methods. -------*/ | |
331 | ||
aa3378df | 332 | /* |
333 | * Tries to authenticate the user using the .rhosts file. Returns true if | |
334 | * authentication succeeds. If ignore_rhosts is non-zero, this will not | |
335 | * consider .rhosts and .shosts (/etc/hosts.equiv will still be used). | |
336 | */ | |
5260325f | 337 | int auth_rhosts(struct passwd * pw, const char *client_user); |
8efc0c15 | 338 | |
aa3378df | 339 | /* |
340 | * Tries to authenticate the user using the .rhosts file and the host using | |
341 | * its host key. Returns true if authentication succeeds. | |
342 | */ | |
5260325f | 343 | int |
4fe2af09 | 344 | auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key); |
8efc0c15 | 345 | |
aa3378df | 346 | /* |
347 | * Tries to authenticate the user using password. Returns true if | |
348 | * authentication succeeds. | |
349 | */ | |
5260325f | 350 | int auth_password(struct passwd * pw, const char *password); |
8efc0c15 | 351 | |
aa3378df | 352 | /* |
353 | * Performs the RSA authentication dialog with the client. This returns 0 if | |
354 | * the client could not be authenticated, and 1 if authentication was | |
355 | * successful. This may exit if there is a serious protocol violation. | |
356 | */ | |
5260325f | 357 | int auth_rsa(struct passwd * pw, BIGNUM * client_n); |
8efc0c15 | 358 | |
aa3378df | 359 | /* |
360 | * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer | |
361 | * over the key. Skips any whitespace at the beginning and at end. | |
362 | */ | |
5260325f | 363 | int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n); |
8efc0c15 | 364 | |
aa3378df | 365 | /* |
366 | * Returns the name of the machine at the other end of the socket. The | |
367 | * returned string should be freed by the caller. | |
368 | */ | |
5260325f | 369 | char *get_remote_hostname(int socket); |
8efc0c15 | 370 | |
aa3378df | 371 | /* |
372 | * Return the canonical name of the host in the other side of the current | |
373 | * connection (as returned by packet_get_connection). The host name is | |
374 | * cached, so it is efficient to call this several times. | |
375 | */ | |
8efc0c15 | 376 | const char *get_canonical_hostname(void); |
377 | ||
aa3378df | 378 | /* |
379 | * Returns the remote IP address as an ascii string. The value need not be | |
380 | * freed by the caller. | |
381 | */ | |
8efc0c15 | 382 | const char *get_remote_ipaddr(void); |
383 | ||
384 | /* Returns the port number of the peer of the socket. */ | |
5260325f | 385 | int get_peer_port(int sock); |
8efc0c15 | 386 | |
48e671d5 | 387 | /* Returns the port number of the remote/local host. */ |
5260325f | 388 | int get_remote_port(void); |
48e671d5 | 389 | int get_local_port(void); |
390 | ||
8efc0c15 | 391 | |
aa3378df | 392 | /* |
393 | * Performs the RSA authentication challenge-response dialog with the client, | |
394 | * and returns true (non-zero) if the client gave the correct answer to our | |
395 | * challenge; returns zero if the client gives a wrong answer. | |
396 | */ | |
4fe2af09 | 397 | int auth_rsa_challenge_dialog(RSA *pk); |
8efc0c15 | 398 | |
aa3378df | 399 | /* |
400 | * Reads a passphrase from /dev/tty with echo turned off. Returns the | |
401 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If | |
402 | * from_stdin is true, the passphrase will be read from stdin instead. | |
403 | */ | |
5260325f | 404 | char *read_passphrase(const char *prompt, int from_stdin); |
8efc0c15 | 405 | |
aa3378df | 406 | /* |
407 | * Saves the authentication (private) key in a file, encrypting it with | |
408 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
409 | * precede the key to provide identification of the key without needing a | |
410 | * passphrase. | |
411 | */ | |
5260325f | 412 | int |
413 | save_private_key(const char *filename, const char *passphrase, | |
414 | RSA * private_key, const char *comment); | |
8efc0c15 | 415 | |
aa3378df | 416 | /* |
417 | * Loads the public part of the key file (public key and comment). Returns 0 | |
418 | * if an error occurred; zero if the public key was successfully read. The | |
419 | * comment of the key is returned in comment_return if it is non-NULL; the | |
420 | * caller must free the value with xfree. | |
421 | */ | |
5260325f | 422 | int |
423 | load_public_key(const char *filename, RSA * pub, | |
424 | char **comment_return); | |
8efc0c15 | 425 | |
aa3378df | 426 | /* |
427 | * Loads the private key from the file. Returns 0 if an error is encountered | |
428 | * (file does not exist or is not readable, or passphrase is bad). This | |
429 | * initializes the private key. The comment of the key is returned in | |
430 | * comment_return if it is non-NULL; the caller must free the value with | |
431 | * xfree. | |
432 | */ | |
5260325f | 433 | int |
434 | load_private_key(const char *filename, const char *passphrase, | |
435 | RSA * private_key, char **comment_return); | |
8efc0c15 | 436 | |
6fa724bc | 437 | /*------------ Definitions for logging. -----------------------*/ |
438 | ||
439 | /* Supported syslog facilities and levels. */ | |
5260325f | 440 | typedef enum { |
441 | SYSLOG_FACILITY_DAEMON, | |
442 | SYSLOG_FACILITY_USER, | |
443 | SYSLOG_FACILITY_AUTH, | |
444 | SYSLOG_FACILITY_LOCAL0, | |
445 | SYSLOG_FACILITY_LOCAL1, | |
446 | SYSLOG_FACILITY_LOCAL2, | |
447 | SYSLOG_FACILITY_LOCAL3, | |
448 | SYSLOG_FACILITY_LOCAL4, | |
449 | SYSLOG_FACILITY_LOCAL5, | |
450 | SYSLOG_FACILITY_LOCAL6, | |
451 | SYSLOG_FACILITY_LOCAL7 | |
452 | } SyslogFacility; | |
453 | ||
454 | typedef enum { | |
455 | SYSLOG_LEVEL_QUIET, | |
456 | SYSLOG_LEVEL_FATAL, | |
457 | SYSLOG_LEVEL_ERROR, | |
458 | SYSLOG_LEVEL_INFO, | |
459 | SYSLOG_LEVEL_VERBOSE, | |
460 | SYSLOG_LEVEL_DEBUG | |
461 | } LogLevel; | |
6fa724bc | 462 | /* Initializes logging. */ |
5260325f | 463 | void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr); |
6fa724bc | 464 | |
465 | /* Logging implementation, depending on server or client */ | |
5260325f | 466 | void do_log(LogLevel level, const char *fmt, va_list args); |
6fa724bc | 467 | |
9d6b7add | 468 | /* name to facility/level */ |
469 | SyslogFacility log_facility_number(char *name); | |
470 | LogLevel log_level_number(char *name); | |
471 | ||
6fa724bc | 472 | /* Output a message to syslog or stderr */ |
5260325f | 473 | void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
474 | void error(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
475 | void log(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
476 | void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
477 | void debug(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
6fa724bc | 478 | |
479 | /* same as fatal() but w/o logging */ | |
5260325f | 480 | void fatal_cleanup(void); |
6fa724bc | 481 | |
aa3378df | 482 | /* |
483 | * Registers a cleanup function to be called by fatal()/fatal_cleanup() | |
484 | * before exiting. It is permissible to call fatal_remove_cleanup for the | |
485 | * function itself from the function. | |
486 | */ | |
5260325f | 487 | void fatal_add_cleanup(void (*proc) (void *context), void *context); |
6fa724bc | 488 | |
489 | /* Removes a cleanup function to be called at fatal(). */ | |
5260325f | 490 | void fatal_remove_cleanup(void (*proc) (void *context), void *context); |
6fa724bc | 491 | |
e78a59f5 | 492 | /* ---- misc */ |
493 | ||
aa3378df | 494 | /* |
495 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
496 | * Warning: this calls getpw*. | |
497 | */ | |
5260325f | 498 | char *tilde_expand_filename(const char *filename, uid_t my_uid); |
8efc0c15 | 499 | |
aa3378df | 500 | /* |
501 | * Performs the interactive session. This handles data transmission between | |
502 | * the client and the program. Note that the notion of stdin, stdout, and | |
503 | * stderr in this function is sort of reversed: this function writes to stdin | |
504 | * (of the child program), and reads from stdout and stderr (of the child | |
505 | * program). | |
506 | */ | |
5260325f | 507 | void server_loop(int pid, int fdin, int fdout, int fderr); |
e78a59f5 | 508 | void server_loop2(void); |
8efc0c15 | 509 | |
510 | /* Client side main loop for the interactive session. */ | |
5260325f | 511 | int client_loop(int have_pty, int escape_char); |
8efc0c15 | 512 | |
513 | /* Linked list of custom environment strings (see auth-rsa.c). */ | |
514 | struct envstring { | |
5260325f | 515 | struct envstring *next; |
516 | char *s; | |
8efc0c15 | 517 | }; |
a408af76 | 518 | |
519 | /* | |
520 | * Ensure all of data on socket comes through. f==read || f==write | |
521 | */ | |
c8d54615 | 522 | ssize_t atomicio(ssize_t (*f)(), int fd, void *s, size_t n); |
a408af76 | 523 | |
8efc0c15 | 524 | #ifdef KRB4 |
525 | #include <krb.h> | |
aa3378df | 526 | /* |
527 | * Performs Kerberos v4 mutual authentication with the client. This returns 0 | |
528 | * if the client could not be authenticated, and 1 if authentication was | |
529 | * successful. This may exit if there is a serious protocol violation. | |
530 | */ | |
5260325f | 531 | int auth_krb4(const char *server_user, KTEXT auth, char **client); |
532 | int krb4_init(uid_t uid); | |
533 | void krb4_cleanup_proc(void *ignore); | |
57112b5a | 534 | int auth_krb4_password(struct passwd * pw, const char *password); |
8efc0c15 | 535 | |
536 | #ifdef AFS | |
537 | #include <kafs.h> | |
538 | ||
539 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ | |
5260325f | 540 | int auth_kerberos_tgt(struct passwd * pw, const char *string); |
541 | int auth_afs_token(struct passwd * pw, const char *token_string); | |
8efc0c15 | 542 | |
5260325f | 543 | int creds_to_radix(CREDENTIALS * creds, unsigned char *buf); |
544 | int radix_to_creds(const char *buf, CREDENTIALS * creds); | |
545 | #endif /* AFS */ | |
8efc0c15 | 546 | |
5260325f | 547 | #endif /* KRB4 */ |
8efc0c15 | 548 | |
549 | #ifdef SKEY | |
550 | #include <skey.h> | |
5260325f | 551 | char *skey_fake_keyinfo(char *username); |
57112b5a | 552 | int auth_skey_password(struct passwd * pw, const char *password); |
5260325f | 553 | #endif /* SKEY */ |
8efc0c15 | 554 | |
48e671d5 | 555 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
556 | extern int IPv4or6; | |
557 | ||
a5c9cd31 | 558 | #ifdef USE_PAM |
559 | #include "auth-pam.h" | |
560 | #endif /* USE_PAM */ | |
561 | ||
5260325f | 562 | #endif /* SSH_H */ |