5 Author: Tatu Ylonen <ylo@cs.hut.fi>
7 Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
10 Created: Fri Mar 17 17:09:37 1995 ylo
12 Generic header file for ssh.
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
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
43 /* Cipher used for encrypting authentication files. */
44 #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
46 /* Default port number. */
47 #define SSH_DEFAULT_PORT 22
49 /* Maximum number of TCP/IP ports forwarded per direction. */
50 #define SSH_MAX_FORWARDS_PER_DIRECTION 100
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
56 /* Major protocol version. Different version indicates major incompatiblity
57 that prevents communication. */
58 #define PROTOCOL_MAJOR 1
60 /* Minor protocol version. Different version indicates minor incompatibility
61 that does not prevent interoperation. */
62 #define PROTOCOL_MINOR 5
64 /* Name for the service. The port named by this service overrides the default
66 #define SSH_SERVICE_NAME "ssh"
72 #define PIDDIR "/var/run"
74 /* System-wide file containing host keys of known hosts. This file should be
76 #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
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. */
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"
89 #define SSH_PROGRAM "/usr/bin/ssh"
90 #endif /* SSH_PROGRAM */
93 #define LOGIN_PROGRAM "/usr/bin/login"
94 #endif /* LOGIN_PROGRAM */
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. */
98 #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
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"
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"
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"
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
118 #define SSH_USER_CONFFILE ".ssh/config"
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
127 #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
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"
136 /* Ssh-only version of /etc/hosts.equiv. */
137 #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
139 /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
140 rhosts authentication is enabled. */
142 /* Name of the environment variable containing the pathname of the
143 authentication socket. */
144 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
146 /* Name of the environment variable containing the pathname of the
147 authentication socket. */
148 #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
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
154 /* Length of the session key in bytes. (Specified as 256 bits in the
156 #define SSH_SESSION_KEY_LENGTH 32
158 /* Name of Kerberos service for SSH to use. */
159 #define KRB4_SERVICE_NAME "rcmd"
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
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
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 */
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
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) */
231 /* Includes that need definitions above. */
233 #include "readconf.h"
235 /*------------ definitions for login.c -------------*/
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);
243 /* Records that the user has logged in. This does many things normally
245 void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
246 const char *host, struct sockaddr_in *addr);
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);
252 /*------------ definitions for sshconnect.c ----------*/
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
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);
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);
277 /*------------ Definitions for various authentication methods. -------*/
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);
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,
293 /* Tries to authenticate the user using password. Returns true if
294 authentication succeeds. */
295 int auth_password(struct passwd *pw, const char *password);
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);
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);
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);
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);
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);
319 /* Returns the port number of the peer of the socket. */
320 int get_peer_port(int sock);
322 /* Returns the port number of the remote host. */
323 int get_remote_port(void);
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
329 int match_hostname(const char *host, const char *pattern, unsigned int len);
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);
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);
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);
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);
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);
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);
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
375 int load_private_key(const char *filename, const char *passphrase,
376 RSA *private_key, char **comment_return);
378 /*------------ Definitions for logging. -----------------------*/
380 /* Supported syslog facilities. */
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
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);
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, ...);
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, ...);
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, ...);
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, ...);
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);
428 /* Removes a cleanup frunction to be called at fatal(). */
429 void fatal_remove_cleanup(void (*proc)(void *context), void *context);
431 /*---------------- definitions for channels ------------------*/
433 /* Sets specific protocol options. */
434 void channel_set_options(int hostname_in_open);
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
439 int channel_allocate(int type, int sock, char *remote_name);
441 /* Free the channel and close its socket. */
442 void channel_free(int channel);
444 /* Add any bits relevant to channels in select bitmasks. */
445 void channel_prepare_select(fd_set *readset, fd_set *writeset);
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);
451 /* If there is data to send to the connection, send some of it now. */
452 void channel_output_poll(void);
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
457 void channel_input_data(int payload_len);
459 /* Returns true if no channel has too much buffered data. */
460 int channel_not_very_much_buffered_data(void);
462 /* This is called after receiving CHANNEL_CLOSE. */
463 void channel_input_close(void);
465 /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
466 void channel_input_close_confirmation(void);
468 /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
469 void channel_input_open_confirmation(void);
471 /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
472 void channel_input_open_failure(void);
474 /* This closes any sockets that are listening for connections; this removes
475 any unix domain sockets. */
476 void channel_stop_listening(void);
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);
482 /* Returns the maximum file descriptor number used by the channels. */
483 int channel_max_fd(void);
485 /* Returns true if there is still an open channel over the connection. */
486 int channel_still_open(void);
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);
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
496 void channel_request_local_forwarding(int port, const char *host,
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,
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);
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
515 void channel_input_port_forward_request(int is_root);
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);
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);
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
529 char *x11_create_display_inet(int screen);
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);
536 /* Requests forwarding of X11 connections. This should be called on the
538 void x11_request_forwarding(void);
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);
544 /* Local Xauthority file (server only). */
545 extern char *xauthfile;
547 /* Sends a message to the server to request authentication fd forwarding. */
548 void auth_request_forwarding(void);
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);
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);
559 /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
560 void auth_input_open_request(void);
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);
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);
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
575 void server_loop(int pid, int fdin, int fdout, int fderr);
577 /* Client side main loop for the interactive session. */
578 int client_loop(int have_pty, int escape_char);
580 /* Linked list of custom environment strings (see auth-rsa.c). */
582 struct envstring *next;
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);
598 /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
599 int auth_kerberos_tgt(struct passwd *pw, const char *string);
600 int auth_afs_token(struct passwd *pw, const char *token_string);
602 int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
603 int radix_to_creds(const char *buf, CREDENTIALS *creds);
610 char *skey_fake_keyinfo(char *username);