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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
6ae2364d | 5 | * |
5260325f | 6 | * Generic header file for ssh. |
6ae2364d | 7 | * |
bcbf86ec | 8 | * As far as I am concerned, the code I have written for this software |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
5260325f | 13 | */ |
8efc0c15 | 14 | |
1e3b8b07 | 15 | /* RCSID("$OpenBSD: ssh.h,v 1.56 2000/12/19 23:17:58 markus Exp $"); */ |
8efc0c15 | 16 | |
17 | #ifndef SSH_H | |
18 | #define SSH_H | |
19 | ||
4cca272e | 20 | #include <netinet/in.h> /* For struct sockaddr_in */ |
21 | #include <pwd.h> /* For struct pw */ | |
6a17f9c2 | 22 | #include <stdarg.h> /* For va_list */ |
57ce3f00 | 23 | #include <syslog.h> /* For LOG_AUTH and friends */ |
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 | ||
8efc0c15 | 32 | /* Cipher used for encrypting authentication files. */ |
33 | #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES | |
34 | ||
35 | /* Default port number. */ | |
36 | #define SSH_DEFAULT_PORT 22 | |
37 | ||
38 | /* Maximum number of TCP/IP ports forwarded per direction. */ | |
39 | #define SSH_MAX_FORWARDS_PER_DIRECTION 100 | |
40 | ||
aa3378df | 41 | /* |
42 | * Maximum number of RSA authentication identity files that can be specified | |
43 | * in configuration files or on the command line. | |
44 | */ | |
8efc0c15 | 45 | #define SSH_MAX_IDENTITY_FILES 100 |
46 | ||
aa3378df | 47 | /* |
48 | * Major protocol version. Different version indicates major incompatiblity | |
49 | * that prevents communication. | |
a8be9f80 | 50 | * |
aa3378df | 51 | * Minor protocol version. Different version indicates minor incompatibility |
52 | * that does not prevent interoperation. | |
53 | */ | |
a8be9f80 | 54 | #define PROTOCOL_MAJOR_1 1 |
55 | #define PROTOCOL_MINOR_1 5 | |
56 | ||
57 | /* We support both SSH1 and SSH2 */ | |
58 | #define PROTOCOL_MAJOR_2 2 | |
59 | #define PROTOCOL_MINOR_2 0 | |
8efc0c15 | 60 | |
aa3378df | 61 | /* |
62 | * Name for the service. The port named by this service overrides the | |
63 | * default port if present. | |
64 | */ | |
8efc0c15 | 65 | #define SSH_SERVICE_NAME "ssh" |
66 | ||
4e577b89 | 67 | #if defined(USE_PAM) && !defined(SSHD_PAM_SERVICE) |
68 | # define SSHD_PAM_SERVICE "sshd" | |
69 | #endif | |
70 | ||
8efc0c15 | 71 | #ifndef ETCDIR |
72 | #define ETCDIR "/etc" | |
73 | #endif /* ETCDIR */ | |
74 | ||
5260325f | 75 | #ifndef PIDDIR |
8efc0c15 | 76 | #define PIDDIR "/var/run" |
5260325f | 77 | #endif /* PIDDIR */ |
8efc0c15 | 78 | |
aa3378df | 79 | /* |
80 | * System-wide file containing host keys of known hosts. This file should be | |
81 | * world-readable. | |
82 | */ | |
8efc0c15 | 83 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" |
a306f2dd | 84 | #define SSH_SYSTEM_HOSTFILE2 ETCDIR "/ssh_known_hosts2" |
8efc0c15 | 85 | |
aa3378df | 86 | /* |
87 | * Of these, ssh_host_key must be readable only by root, whereas ssh_config | |
88 | * should be world-readable. | |
89 | */ | |
8efc0c15 | 90 | #define HOST_KEY_FILE ETCDIR "/ssh_host_key" |
91 | #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" | |
92 | #define HOST_CONFIG_FILE ETCDIR "/ssh_config" | |
1d1ffb87 | 93 | #define HOST_DSA_KEY_FILE ETCDIR "/ssh_host_dsa_key" |
94ec8c6b | 94 | #define DH_PRIMES ETCDIR "/primes" |
8efc0c15 | 95 | |
e1a9c08d | 96 | #ifndef SSH_PROGRAM |
5260325f | 97 | #define SSH_PROGRAM "/usr/bin/ssh" |
e1a9c08d | 98 | #endif /* SSH_PROGRAM */ |
99 | ||
100 | #ifndef LOGIN_PROGRAM | |
2e73a022 | 101 | # ifdef LOGIN_PROGRAM_FALLBACK |
102 | # define LOGIN_PROGRAM LOGIN_PROGRAM_FALLBACK | |
103 | # else | |
104 | # define LOGIN_PROGRAM "/usr/bin/login" | |
105 | # endif | |
e1a9c08d | 106 | #endif /* LOGIN_PROGRAM */ |
8efc0c15 | 107 | |
d4f11b59 | 108 | #ifndef ASKPASS_PROGRAM |
5260325f | 109 | #define ASKPASS_PROGRAM "/usr/lib/ssh/ssh-askpass" |
d4f11b59 | 110 | #endif /* ASKPASS_PROGRAM */ |
111 | ||
aa3378df | 112 | /* |
113 | * The process id of the daemon listening for connections is saved here to | |
114 | * make it easier to kill the correct daemon when necessary. | |
115 | */ | |
f1bcacf9 | 116 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" |
8efc0c15 | 117 | |
aa3378df | 118 | /* |
119 | * The directory in user\'s home directory in which the files reside. The | |
120 | * directory should be world-readable (though not all files are). | |
121 | */ | |
8efc0c15 | 122 | #define SSH_USER_DIR ".ssh" |
123 | ||
b7a87eea | 124 | /* |
125 | * Relevant only when using builtin PRNG. | |
126 | */ | |
127 | #ifndef SSH_PRNG_SEED_FILE | |
128 | # define SSH_PRNG_SEED_FILE SSH_USER_DIR"/prng_seed" | |
129 | #endif /* SSH_PRNG_SEED_FILE */ | |
d3083fbd | 130 | #ifndef SSH_PRNG_COMMAND_FILE |
131 | # define SSH_PRNG_COMMAND_FILE ETCDIR "/ssh_prng_cmds" | |
132 | #endif /* SSH_PRNG_COMMAND_FILE */ | |
b7a87eea | 133 | |
aa3378df | 134 | /* |
135 | * Per-user file containing host keys of known hosts. This file need not be | |
136 | * readable by anyone except the user him/herself, though this does not | |
137 | * contain anything particularly secret. | |
138 | */ | |
8efc0c15 | 139 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" |
a306f2dd | 140 | #define SSH_USER_HOSTFILE2 "~/.ssh/known_hosts2" |
8efc0c15 | 141 | |
aa3378df | 142 | /* |
143 | * Name of the default file containing client-side authentication key. This | |
144 | * file should only be readable by the user him/herself. | |
145 | */ | |
8efc0c15 | 146 | #define SSH_CLIENT_IDENTITY ".ssh/identity" |
1d1ffb87 | 147 | #define SSH_CLIENT_ID_DSA ".ssh/id_dsa" |
c523303b | 148 | #define SSH_CLIENT_ID_RSA ".ssh/id_rsa" |
8efc0c15 | 149 | |
aa3378df | 150 | /* |
151 | * Configuration file in user\'s home directory. This file need not be | |
152 | * readable by anyone but the user him/herself, but does not contain anything | |
153 | * particularly secret. If the user\'s home directory resides on an NFS | |
154 | * volume where root is mapped to nobody, this may need to be world-readable. | |
155 | */ | |
8efc0c15 | 156 | #define SSH_USER_CONFFILE ".ssh/config" |
157 | ||
aa3378df | 158 | /* |
159 | * File containing a list of those rsa keys that permit logging in as this | |
160 | * user. This file need not be readable by anyone but the user him/herself, | |
161 | * but does not contain anything particularly secret. If the user\'s home | |
162 | * directory resides on an NFS volume where root is mapped to nobody, this | |
163 | * may need to be world-readable. (This file is read by the daemon which is | |
164 | * running as root.) | |
165 | */ | |
8efc0c15 | 166 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" |
a306f2dd | 167 | #define SSH_USER_PERMITTED_KEYS2 ".ssh/authorized_keys2" |
8efc0c15 | 168 | |
aa3378df | 169 | /* |
170 | * Per-user and system-wide ssh "rc" files. These files are executed with | |
171 | * /bin/sh before starting the shell or command if they exist. They will be | |
172 | * passed "proto cookie" as arguments if X11 forwarding with spoofing is in | |
173 | * use. xauth will be run if neither of these exists. | |
174 | */ | |
8efc0c15 | 175 | #define SSH_USER_RC ".ssh/rc" |
176 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" | |
177 | ||
aa3378df | 178 | /* |
179 | * Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use | |
180 | * ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled. | |
181 | */ | |
8efc0c15 | 182 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" |
183 | ||
aa3378df | 184 | /* |
185 | * Name of the environment variable containing the pathname of the | |
186 | * authentication socket. | |
187 | */ | |
8efc0c15 | 188 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" |
189 | ||
aa3378df | 190 | /* |
191 | * Name of the environment variable containing the pathname of the | |
192 | * authentication socket. | |
193 | */ | |
b4748e2f | 194 | #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" |
50da1126 | 195 | |
57112b5a | 196 | /* |
197 | * Default path to ssh-askpass used by ssh-add, | |
198 | * environment variable for overwriting the default location | |
199 | */ | |
db28aeb5 | 200 | #ifndef SSH_ASKPASS_DEFAULT |
201 | # define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass" | |
202 | #endif | |
57112b5a | 203 | #define SSH_ASKPASS_ENV "SSH_ASKPASS" |
204 | ||
aa3378df | 205 | /* |
206 | * Force host key length and server key length to differ by at least this | |
207 | * many bits. This is to make double encryption with rsaref work. | |
208 | */ | |
8efc0c15 | 209 | #define SSH_KEY_BITS_RESERVED 128 |
210 | ||
aa3378df | 211 | /* |
212 | * Length of the session key in bytes. (Specified as 256 bits in the | |
213 | * protocol.) | |
214 | */ | |
8efc0c15 | 215 | #define SSH_SESSION_KEY_LENGTH 32 |
216 | ||
217 | /* Name of Kerberos service for SSH to use. */ | |
218 | #define KRB4_SERVICE_NAME "rcmd" | |
219 | ||
aa3378df | 220 | /* |
221 | * Authentication methods. New types can be added, but old types should not | |
222 | * be removed for compatibility. The maximum allowed value is 31. | |
223 | */ | |
8efc0c15 | 224 | #define SSH_AUTH_RHOSTS 1 |
225 | #define SSH_AUTH_RSA 2 | |
226 | #define SSH_AUTH_PASSWORD 3 | |
227 | #define SSH_AUTH_RHOSTS_RSA 4 | |
5260325f | 228 | #define SSH_AUTH_TIS 5 |
8efc0c15 | 229 | #define SSH_AUTH_KERBEROS 6 |
230 | #define SSH_PASS_KERBEROS_TGT 7 | |
aa3378df | 231 | /* 8 to 15 are reserved */ |
8efc0c15 | 232 | #define SSH_PASS_AFS_TOKEN 21 |
233 | ||
234 | /* Protocol flags. These are bit masks. */ | |
aa3378df | 235 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ |
236 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ | |
237 | ||
238 | /* | |
239 | * Definition of message types. New values can be added, but old values | |
240 | * should not be removed or without careful consideration of the consequences | |
241 | * for compatibility. The maximum value is 254; value 255 is reserved for | |
242 | * future extension. | |
243 | */ | |
244 | /* Message name */ /* msg code */ /* arguments */ | |
8efc0c15 | 245 | #define SSH_MSG_NONE 0 /* no message */ |
246 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ | |
247 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ | |
248 | #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ | |
249 | #define SSH_CMSG_USER 4 /* user (string) */ | |
250 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ | |
251 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ | |
252 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ | |
253 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ | |
254 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ | |
255 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ | |
256 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ | |
257 | #define SSH_CMSG_EXEC_SHELL 12 /* */ | |
258 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ | |
259 | #define SSH_SMSG_SUCCESS 14 /* */ | |
260 | #define SSH_SMSG_FAILURE 15 /* */ | |
261 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ | |
262 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ | |
263 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ | |
264 | #define SSH_CMSG_EOF 19 /* */ | |
265 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ | |
266 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ | |
267 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ | |
268 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ | |
269 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ | |
270 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ | |
271 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ | |
272 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ | |
273 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ | |
274 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ | |
275 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ | |
276 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ | |
277 | #define SSH_MSG_IGNORE 32 /* string */ | |
278 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ | |
279 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ | |
280 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ | |
281 | #define SSH_MSG_DEBUG 36 /* string */ | |
282 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ | |
283 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ | |
5260325f | 284 | #define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */ |
285 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */ | |
286 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */ | |
8efc0c15 | 287 | #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */ |
288 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */ | |
289 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */ | |
290 | #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ | |
291 | ||
8efc0c15 | 292 | /*------------ definitions for login.c -------------*/ |
293 | ||
aa3378df | 294 | /* |
295 | * Returns the time when the user last logged in. Returns 0 if the | |
296 | * information is not available. This must be called before record_login. | |
297 | * The host from which the user logged in is stored in buf. | |
298 | */ | |
1e3b8b07 | 299 | u_long |
5260325f | 300 | get_last_login_time(uid_t uid, const char *logname, |
1e3b8b07 | 301 | char *buf, u_int bufsize); |
8efc0c15 | 302 | |
aa3378df | 303 | /* |
304 | * Records that the user has logged in. This does many things normally done | |
305 | * by login(1). | |
306 | */ | |
6ae2364d | 307 | void |
9da5c3c9 | 308 | record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid, |
48e671d5 | 309 | const char *host, struct sockaddr *addr); |
8efc0c15 | 310 | |
aa3378df | 311 | /* |
312 | * Records that the user has logged out. This does many thigs normally done | |
313 | * by login(1) or init. | |
314 | */ | |
9da5c3c9 | 315 | void record_logout(pid_t pid, const char *ttyname); |
8efc0c15 | 316 | |
317 | /*------------ definitions for sshconnect.c ----------*/ | |
318 | ||
aa3378df | 319 | /* |
320 | * Opens a TCP/IP connection to the remote server on the given host. If port | |
321 | * is 0, the default port will be used. If anonymous is zero, a privileged | |
322 | * port will be allocated to make the connection. This requires super-user | |
323 | * privileges if anonymous is false. Connection_attempts specifies the | |
324 | * maximum number of tries, one per second. This returns true on success, | |
325 | * and zero on failure. If the connection is successful, this calls | |
326 | * packet_set_connection for the connection. | |
327 | */ | |
6ae2364d | 328 | int |
48e671d5 | 329 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
57112b5a | 330 | u_short port, int connection_attempts, |
5260325f | 331 | int anonymous, uid_t original_real_uid, |
332 | const char *proxy_command); | |
8efc0c15 | 333 | |
aa3378df | 334 | /* |
335 | * Starts a dialog with the server, and authenticates the current user on the | |
336 | * server. This does not need any extra privileges. The basic connection to | |
337 | * the server must already have been established before this is called. If | |
338 | * login fails, this function prints an error and never returns. This | |
339 | * initializes the random state, and leaves it initialized (it will also have | |
340 | * references from the packet module). | |
341 | */ | |
6a17f9c2 | 342 | |
6ae2364d | 343 | void |
5260325f | 344 | ssh_login(int host_key_valid, RSA * host_key, const char *host, |
48e671d5 | 345 | struct sockaddr * hostaddr, uid_t original_real_uid); |
8efc0c15 | 346 | |
347 | /*------------ Definitions for various authentication methods. -------*/ | |
348 | ||
aa3378df | 349 | /* |
350 | * Tries to authenticate the user using the .rhosts file. Returns true if | |
351 | * authentication succeeds. If ignore_rhosts is non-zero, this will not | |
352 | * consider .rhosts and .shosts (/etc/hosts.equiv will still be used). | |
353 | */ | |
5260325f | 354 | int auth_rhosts(struct passwd * pw, const char *client_user); |
8efc0c15 | 355 | |
aa3378df | 356 | /* |
357 | * Tries to authenticate the user using the .rhosts file and the host using | |
358 | * its host key. Returns true if authentication succeeds. | |
359 | */ | |
6ae2364d | 360 | int |
4fe2af09 | 361 | auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key); |
8efc0c15 | 362 | |
aa3378df | 363 | /* |
364 | * Tries to authenticate the user using password. Returns true if | |
365 | * authentication succeeds. | |
366 | */ | |
5260325f | 367 | int auth_password(struct passwd * pw, const char *password); |
8efc0c15 | 368 | |
aa3378df | 369 | /* |
370 | * Performs the RSA authentication dialog with the client. This returns 0 if | |
371 | * the client could not be authenticated, and 1 if authentication was | |
372 | * successful. This may exit if there is a serious protocol violation. | |
373 | */ | |
5260325f | 374 | int auth_rsa(struct passwd * pw, BIGNUM * client_n); |
8efc0c15 | 375 | |
aa3378df | 376 | /* |
377 | * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer | |
378 | * over the key. Skips any whitespace at the beginning and at end. | |
379 | */ | |
1e3b8b07 | 380 | int auth_rsa_read_key(char **cpp, u_int *bitsp, BIGNUM * e, BIGNUM * n); |
8efc0c15 | 381 | |
aa3378df | 382 | /* |
383 | * Returns the name of the machine at the other end of the socket. The | |
384 | * returned string should be freed by the caller. | |
385 | */ | |
5260325f | 386 | char *get_remote_hostname(int socket); |
8efc0c15 | 387 | |
aa3378df | 388 | /* |
389 | * Return the canonical name of the host in the other side of the current | |
390 | * connection (as returned by packet_get_connection). The host name is | |
391 | * cached, so it is efficient to call this several times. | |
392 | */ | |
8efc0c15 | 393 | const char *get_canonical_hostname(void); |
394 | ||
aa3378df | 395 | /* |
396 | * Returns the remote IP address as an ascii string. The value need not be | |
397 | * freed by the caller. | |
398 | */ | |
8efc0c15 | 399 | const char *get_remote_ipaddr(void); |
400 | ||
401 | /* Returns the port number of the peer of the socket. */ | |
5260325f | 402 | int get_peer_port(int sock); |
8efc0c15 | 403 | |
48e671d5 | 404 | /* Returns the port number of the remote/local host. */ |
5260325f | 405 | int get_remote_port(void); |
48e671d5 | 406 | int get_local_port(void); |
407 | ||
8efc0c15 | 408 | |
aa3378df | 409 | /* |
410 | * Performs the RSA authentication challenge-response dialog with the client, | |
411 | * and returns true (non-zero) if the client gave the correct answer to our | |
412 | * challenge; returns zero if the client gives a wrong answer. | |
413 | */ | |
4fe2af09 | 414 | int auth_rsa_challenge_dialog(RSA *pk); |
8efc0c15 | 415 | |
aa3378df | 416 | /* |
417 | * Reads a passphrase from /dev/tty with echo turned off. Returns the | |
418 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If | |
419 | * from_stdin is true, the passphrase will be read from stdin instead. | |
420 | */ | |
94ec8c6b | 421 | char *read_passphrase(char *prompt, int from_stdin); |
8efc0c15 | 422 | |
8efc0c15 | 423 | |
6fa724bc | 424 | /*------------ Definitions for logging. -----------------------*/ |
425 | ||
426 | /* Supported syslog facilities and levels. */ | |
5260325f | 427 | typedef enum { |
428 | SYSLOG_FACILITY_DAEMON, | |
429 | SYSLOG_FACILITY_USER, | |
430 | SYSLOG_FACILITY_AUTH, | |
57ce3f00 | 431 | #ifdef LOG_AUTHPRIV |
432 | SYSLOG_FACILITY_AUTHPRIV, | |
433 | #endif | |
5260325f | 434 | SYSLOG_FACILITY_LOCAL0, |
435 | SYSLOG_FACILITY_LOCAL1, | |
436 | SYSLOG_FACILITY_LOCAL2, | |
437 | SYSLOG_FACILITY_LOCAL3, | |
438 | SYSLOG_FACILITY_LOCAL4, | |
439 | SYSLOG_FACILITY_LOCAL5, | |
440 | SYSLOG_FACILITY_LOCAL6, | |
441 | SYSLOG_FACILITY_LOCAL7 | |
442 | } SyslogFacility; | |
443 | ||
444 | typedef enum { | |
445 | SYSLOG_LEVEL_QUIET, | |
446 | SYSLOG_LEVEL_FATAL, | |
447 | SYSLOG_LEVEL_ERROR, | |
448 | SYSLOG_LEVEL_INFO, | |
449 | SYSLOG_LEVEL_VERBOSE, | |
bcbf86ec | 450 | SYSLOG_LEVEL_DEBUG1, |
451 | SYSLOG_LEVEL_DEBUG2, | |
452 | SYSLOG_LEVEL_DEBUG3 | |
5260325f | 453 | } LogLevel; |
6fa724bc | 454 | /* Initializes logging. */ |
5260325f | 455 | void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr); |
6fa724bc | 456 | |
457 | /* Logging implementation, depending on server or client */ | |
5260325f | 458 | void do_log(LogLevel level, const char *fmt, va_list args); |
6fa724bc | 459 | |
9d6b7add | 460 | /* name to facility/level */ |
461 | SyslogFacility log_facility_number(char *name); | |
462 | LogLevel log_level_number(char *name); | |
463 | ||
6fa724bc | 464 | /* Output a message to syslog or stderr */ |
5260325f | 465 | void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
466 | void error(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
467 | void log(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
468 | void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
469 | void debug(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
bcbf86ec | 470 | void debug2(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
471 | void debug3(const char *fmt,...) __attribute__((format(printf, 1, 2))); | |
6fa724bc | 472 | |
473 | /* same as fatal() but w/o logging */ | |
5260325f | 474 | void fatal_cleanup(void); |
6fa724bc | 475 | |
aa3378df | 476 | /* |
477 | * Registers a cleanup function to be called by fatal()/fatal_cleanup() | |
478 | * before exiting. It is permissible to call fatal_remove_cleanup for the | |
479 | * function itself from the function. | |
480 | */ | |
5260325f | 481 | void fatal_add_cleanup(void (*proc) (void *context), void *context); |
6fa724bc | 482 | |
483 | /* Removes a cleanup function to be called at fatal(). */ | |
5260325f | 484 | void fatal_remove_cleanup(void (*proc) (void *context), void *context); |
6fa724bc | 485 | |
e78a59f5 | 486 | /* ---- misc */ |
487 | ||
aa3378df | 488 | /* |
489 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
490 | * Warning: this calls getpw*. | |
491 | */ | |
5260325f | 492 | char *tilde_expand_filename(const char *filename, uid_t my_uid); |
8efc0c15 | 493 | |
0e73cc53 | 494 | /* remove newline at end of string */ |
495 | char *chop(char *s); | |
496 | ||
704b1659 | 497 | /* return next token in configuration line */ |
498 | char *strdelim(char **s); | |
499 | ||
0e73cc53 | 500 | /* set filedescriptor to non-blocking */ |
501 | void set_nonblock(int fd); | |
502 | ||
aa3378df | 503 | /* |
504 | * Performs the interactive session. This handles data transmission between | |
505 | * the client and the program. Note that the notion of stdin, stdout, and | |
506 | * stderr in this function is sort of reversed: this function writes to stdin | |
507 | * (of the child program), and reads from stdout and stderr (of the child | |
508 | * program). | |
509 | */ | |
9da5c3c9 | 510 | void server_loop(pid_t pid, int fdin, int fdout, int fderr); |
e78a59f5 | 511 | void server_loop2(void); |
8efc0c15 | 512 | |
513 | /* Client side main loop for the interactive session. */ | |
2e73a022 | 514 | int client_loop(int have_pty, int escape_char, int id); |
8efc0c15 | 515 | |
516 | /* Linked list of custom environment strings (see auth-rsa.c). */ | |
517 | struct envstring { | |
5260325f | 518 | struct envstring *next; |
519 | char *s; | |
8efc0c15 | 520 | }; |
a408af76 | 521 | |
522 | /* | |
523 | * Ensure all of data on socket comes through. f==read || f==write | |
524 | */ | |
c8d54615 | 525 | ssize_t atomicio(ssize_t (*f)(), int fd, void *s, size_t n); |
a408af76 | 526 | |
8efc0c15 | 527 | #ifdef KRB4 |
528 | #include <krb.h> | |
aa3378df | 529 | /* |
530 | * Performs Kerberos v4 mutual authentication with the client. This returns 0 | |
531 | * if the client could not be authenticated, and 1 if authentication was | |
532 | * successful. This may exit if there is a serious protocol violation. | |
533 | */ | |
5260325f | 534 | int auth_krb4(const char *server_user, KTEXT auth, char **client); |
535 | int krb4_init(uid_t uid); | |
536 | void krb4_cleanup_proc(void *ignore); | |
57112b5a | 537 | int auth_krb4_password(struct passwd * pw, const char *password); |
8efc0c15 | 538 | |
539 | #ifdef AFS | |
540 | #include <kafs.h> | |
541 | ||
542 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ | |
5260325f | 543 | int auth_kerberos_tgt(struct passwd * pw, const char *string); |
544 | int auth_afs_token(struct passwd * pw, const char *token_string); | |
8efc0c15 | 545 | |
1e3b8b07 | 546 | int creds_to_radix(CREDENTIALS * creds, u_char *buf, size_t buflen); |
5260325f | 547 | int radix_to_creds(const char *buf, CREDENTIALS * creds); |
548 | #endif /* AFS */ | |
8efc0c15 | 549 | |
5260325f | 550 | #endif /* KRB4 */ |
8efc0c15 | 551 | |
552 | #ifdef SKEY | |
553 | #include <skey.h> | |
5260325f | 554 | char *skey_fake_keyinfo(char *username); |
57112b5a | 555 | int auth_skey_password(struct passwd * pw, const char *password); |
5260325f | 556 | #endif /* SKEY */ |
8efc0c15 | 557 | |
48e671d5 | 558 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
559 | extern int IPv4or6; | |
560 | ||
5260325f | 561 | #endif /* SSH_H */ |