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.
21 #include <netinet/in.h> /* For struct sockaddr_in */
22 #include <pwd.h> /* For struct pw */
23 #include <stdarg.h> /* For va_list */
24 #include <sys/socket.h> /* For struct sockaddr_storage */
25 #include "fake-socket.h" /* For struct sockaddr_storage */
26 #ifdef HAVE_SYS_SELECT_H
27 # include <sys/select.h>
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.
37 #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES
39 /* Cipher used for encrypting authentication files. */
40 #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
42 /* Default port number. */
43 #define SSH_DEFAULT_PORT 22
45 /* Maximum number of TCP/IP ports forwarded per direction. */
46 #define SSH_MAX_FORWARDS_PER_DIRECTION 100
49 * Maximum number of RSA authentication identity files that can be specified
50 * in configuration files or on the command line.
52 #define SSH_MAX_IDENTITY_FILES 100
55 * Major protocol version. Different version indicates major incompatiblity
56 * that prevents communication.
58 #define PROTOCOL_MAJOR 1
61 * Minor protocol version. Different version indicates minor incompatibility
62 * that does not prevent interoperation.
64 #define PROTOCOL_MINOR 5
67 * Name for the service. The port named by this service overrides the
68 * default port if present.
70 #define SSH_SERVICE_NAME "ssh"
77 #define PIDDIR "/var/run"
81 * System-wide file containing host keys of known hosts. This file should be
84 #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
87 * Of these, ssh_host_key must be readable only by root, whereas ssh_config
88 * should be world-readable.
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"
95 #define SSH_PROGRAM "/usr/bin/ssh"
96 #endif /* SSH_PROGRAM */
99 #define LOGIN_PROGRAM "/usr/bin/login"
100 #endif /* LOGIN_PROGRAM */
102 #ifndef ASKPASS_PROGRAM
103 #define ASKPASS_PROGRAM "/usr/lib/ssh/ssh-askpass"
104 #endif /* ASKPASS_PROGRAM */
107 * The process id of the daemon listening for connections is saved here to
108 * make it easier to kill the correct daemon when necessary.
110 #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
113 * The directory in user\'s home directory in which the files reside. The
114 * directory should be world-readable (though not all files are).
116 #define SSH_USER_DIR ".ssh"
119 * Per-user file containing host keys of known hosts. This file need not be
120 * readable by anyone except the user him/herself, though this does not
121 * contain anything particularly secret.
123 #define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
126 * Name of the default file containing client-side authentication key. This
127 * file should only be readable by the user him/herself.
129 #define SSH_CLIENT_IDENTITY ".ssh/identity"
132 * Configuration file in user\'s home directory. This file need not be
133 * readable by anyone but the user him/herself, but does not contain anything
134 * particularly secret. If the user\'s home directory resides on an NFS
135 * volume where root is mapped to nobody, this may need to be world-readable.
137 #define SSH_USER_CONFFILE ".ssh/config"
140 * File containing a list of those rsa keys that permit logging in as this
141 * user. This file need not be readable by anyone but the user him/herself,
142 * but does not contain anything particularly secret. If the user\'s home
143 * directory resides on an NFS volume where root is mapped to nobody, this
144 * may need to be world-readable. (This file is read by the daemon which is
147 #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
150 * Per-user and system-wide ssh "rc" files. These files are executed with
151 * /bin/sh before starting the shell or command if they exist. They will be
152 * passed "proto cookie" as arguments if X11 forwarding with spoofing is in
153 * use. xauth will be run if neither of these exists.
155 #define SSH_USER_RC ".ssh/rc"
156 #define SSH_SYSTEM_RC ETCDIR "/sshrc"
159 * Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use
160 * ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled.
162 #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
165 * Name of the environment variable containing the pathname of the
166 * authentication socket.
168 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
171 * Name of the environment variable containing the pathname of the
172 * authentication socket.
174 #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
177 * Default path to ssh-askpass used by ssh-add,
178 * environment variable for overwriting the default location
180 #ifndef SSH_ASKPASS_DEFAULT
181 # define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass"
183 #define SSH_ASKPASS_ENV "SSH_ASKPASS"
186 * Force host key length and server key length to differ by at least this
187 * many bits. This is to make double encryption with rsaref work.
189 #define SSH_KEY_BITS_RESERVED 128
192 * Length of the session key in bytes. (Specified as 256 bits in the
195 #define SSH_SESSION_KEY_LENGTH 32
197 /* Name of Kerberos service for SSH to use. */
198 #define KRB4_SERVICE_NAME "rcmd"
201 * Authentication methods. New types can be added, but old types should not
202 * be removed for compatibility. The maximum allowed value is 31.
204 #define SSH_AUTH_RHOSTS 1
205 #define SSH_AUTH_RSA 2
206 #define SSH_AUTH_PASSWORD 3
207 #define SSH_AUTH_RHOSTS_RSA 4
208 #define SSH_AUTH_TIS 5
209 #define SSH_AUTH_KERBEROS 6
210 #define SSH_PASS_KERBEROS_TGT 7
211 /* 8 to 15 are reserved */
212 #define SSH_PASS_AFS_TOKEN 21
214 /* Protocol flags. These are bit masks. */
215 #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
216 #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
219 * Definition of message types. New values can be added, but old values
220 * should not be removed or without careful consideration of the consequences
221 * for compatibility. The maximum value is 254; value 255 is reserved for
224 /* Message name */ /* msg code */ /* arguments */
225 #define SSH_MSG_NONE 0 /* no message */
226 #define SSH_MSG_DISCONNECT 1 /* cause (string) */
227 #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
228 #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
229 #define SSH_CMSG_USER 4 /* user (string) */
230 #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
231 #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
232 #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
233 #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
234 #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
235 #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
236 #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
237 #define SSH_CMSG_EXEC_SHELL 12 /* */
238 #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
239 #define SSH_SMSG_SUCCESS 14 /* */
240 #define SSH_SMSG_FAILURE 15 /* */
241 #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
242 #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
243 #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
244 #define SSH_CMSG_EOF 19 /* */
245 #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
246 #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
247 #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
248 #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
249 #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
250 #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
251 /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
252 #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
253 #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
254 #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
255 #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
256 #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
257 #define SSH_MSG_IGNORE 32 /* string */
258 #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
259 #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
260 #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
261 #define SSH_MSG_DEBUG 36 /* string */
262 #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
263 #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */
264 #define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */
265 #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */
266 #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */
267 #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
268 #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
269 #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
270 #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
272 /*------------ definitions for login.c -------------*/
275 * Returns the time when the user last logged in. Returns 0 if the
276 * information is not available. This must be called before record_login.
277 * The host from which the user logged in is stored in buf.
280 get_last_login_time(uid_t uid, const char *logname,
281 char *buf, unsigned int bufsize);
284 * Records that the user has logged in. This does many things normally done
288 record_login(int pid, const char *ttyname, const char *user, uid_t uid,
289 const char *host, struct sockaddr *addr);
292 * Records that the user has logged out. This does many thigs normally done
293 * by login(1) or init.
295 void record_logout(int pid, const char *ttyname);
297 /*------------ definitions for sshconnect.c ----------*/
300 * Opens a TCP/IP connection to the remote server on the given host. If port
301 * is 0, the default port will be used. If anonymous is zero, a privileged
302 * port will be allocated to make the connection. This requires super-user
303 * privileges if anonymous is false. Connection_attempts specifies the
304 * maximum number of tries, one per second. This returns true on success,
305 * and zero on failure. If the connection is successful, this calls
306 * packet_set_connection for the connection.
309 ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
310 u_short port, int connection_attempts,
311 int anonymous, uid_t original_real_uid,
312 const char *proxy_command);
315 * Starts a dialog with the server, and authenticates the current user on the
316 * server. This does not need any extra privileges. The basic connection to
317 * the server must already have been established before this is called. If
318 * login fails, this function prints an error and never returns. This
319 * initializes the random state, and leaves it initialized (it will also have
320 * references from the packet module).
324 ssh_login(int host_key_valid, RSA * host_key, const char *host,
325 struct sockaddr * hostaddr, uid_t original_real_uid);
327 /*------------ Definitions for various authentication methods. -------*/
330 * Tries to authenticate the user using the .rhosts file. Returns true if
331 * authentication succeeds. If ignore_rhosts is non-zero, this will not
332 * consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
334 int auth_rhosts(struct passwd * pw, const char *client_user);
337 * Tries to authenticate the user using the .rhosts file and the host using
338 * its host key. Returns true if authentication succeeds.
341 auth_rhosts_rsa(struct passwd * pw, const char *client_user,
342 BIGNUM * client_host_key_e, BIGNUM * client_host_key_n);
345 * Tries to authenticate the user using password. Returns true if
346 * authentication succeeds.
348 int auth_password(struct passwd * pw, const char *password);
351 * Performs the RSA authentication dialog with the client. This returns 0 if
352 * the client could not be authenticated, and 1 if authentication was
353 * successful. This may exit if there is a serious protocol violation.
355 int auth_rsa(struct passwd * pw, BIGNUM * client_n);
358 * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
359 * over the key. Skips any whitespace at the beginning and at end.
361 int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n);
364 * Returns the name of the machine at the other end of the socket. The
365 * returned string should be freed by the caller.
367 char *get_remote_hostname(int socket);
370 * Return the canonical name of the host in the other side of the current
371 * connection (as returned by packet_get_connection). The host name is
372 * cached, so it is efficient to call this several times.
374 const char *get_canonical_hostname(void);
377 * Returns the remote IP address as an ascii string. The value need not be
378 * freed by the caller.
380 const char *get_remote_ipaddr(void);
382 /* Returns the port number of the peer of the socket. */
383 int get_peer_port(int sock);
385 /* Returns the port number of the remote/local host. */
386 int get_remote_port(void);
387 int get_local_port(void);
391 * Tries to match the host name (which must be in all lowercase) against the
392 * comma-separated sequence of subpatterns (each possibly preceded by ! to
393 * indicate negation). Returns true if there is a positive match; zero
396 int match_hostname(const char *host, const char *pattern, unsigned int len);
399 * Checks whether the given host is already in the list of our known hosts.
400 * Returns HOST_OK if the host is known and has the specified key, HOST_NEW
401 * if the host is not known, and HOST_CHANGED if the host is known but used
402 * to have a different host key. The host must be in all lowercase.
405 HOST_OK, HOST_NEW, HOST_CHANGED
408 check_host_in_hostfile(const char *filename, const char *host,
409 BIGNUM * e, BIGNUM * n, BIGNUM * ke, BIGNUM * kn);
412 * Appends an entry to the host file. Returns false if the entry could not
416 add_host_to_hostfile(const char *filename, const char *host,
417 BIGNUM * e, BIGNUM * n);
420 * Performs the RSA authentication challenge-response dialog with the client,
421 * and returns true (non-zero) if the client gave the correct answer to our
422 * challenge; returns zero if the client gives a wrong answer.
424 int auth_rsa_challenge_dialog(BIGNUM * e, BIGNUM * n);
427 * Reads a passphrase from /dev/tty with echo turned off. Returns the
428 * passphrase (allocated with xmalloc). Exits if EOF is encountered. If
429 * from_stdin is true, the passphrase will be read from stdin instead.
431 char *read_passphrase(const char *prompt, int from_stdin);
434 * Saves the authentication (private) key in a file, encrypting it with
435 * passphrase. The identification of the file (lowest 64 bits of n) will
436 * precede the key to provide identification of the key without needing a
440 save_private_key(const char *filename, const char *passphrase,
441 RSA * private_key, const char *comment);
444 * Loads the public part of the key file (public key and comment). Returns 0
445 * if an error occurred; zero if the public key was successfully read. The
446 * comment of the key is returned in comment_return if it is non-NULL; the
447 * caller must free the value with xfree.
450 load_public_key(const char *filename, RSA * pub,
451 char **comment_return);
454 * Loads the private key from the file. Returns 0 if an error is encountered
455 * (file does not exist or is not readable, or passphrase is bad). This
456 * initializes the private key. The comment of the key is returned in
457 * comment_return if it is non-NULL; the caller must free the value with
461 load_private_key(const char *filename, const char *passphrase,
462 RSA * private_key, char **comment_return);
464 /*------------ Definitions for logging. -----------------------*/
466 /* Supported syslog facilities and levels. */
468 SYSLOG_FACILITY_DAEMON,
469 SYSLOG_FACILITY_USER,
470 SYSLOG_FACILITY_AUTH,
471 SYSLOG_FACILITY_LOCAL0,
472 SYSLOG_FACILITY_LOCAL1,
473 SYSLOG_FACILITY_LOCAL2,
474 SYSLOG_FACILITY_LOCAL3,
475 SYSLOG_FACILITY_LOCAL4,
476 SYSLOG_FACILITY_LOCAL5,
477 SYSLOG_FACILITY_LOCAL6,
478 SYSLOG_FACILITY_LOCAL7
486 SYSLOG_LEVEL_VERBOSE,
489 /* Initializes logging. */
490 void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr);
492 /* Logging implementation, depending on server or client */
493 void do_log(LogLevel level, const char *fmt, va_list args);
495 /* name to facility/level */
496 SyslogFacility log_facility_number(char *name);
497 LogLevel log_level_number(char *name);
499 /* Output a message to syslog or stderr */
500 void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2)));
501 void error(const char *fmt,...) __attribute__((format(printf, 1, 2)));
502 void log(const char *fmt,...) __attribute__((format(printf, 1, 2)));
503 void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2)));
504 void debug(const char *fmt,...) __attribute__((format(printf, 1, 2)));
506 /* same as fatal() but w/o logging */
507 void fatal_cleanup(void);
510 * Registers a cleanup function to be called by fatal()/fatal_cleanup()
511 * before exiting. It is permissible to call fatal_remove_cleanup for the
512 * function itself from the function.
514 void fatal_add_cleanup(void (*proc) (void *context), void *context);
516 /* Removes a cleanup function to be called at fatal(). */
517 void fatal_remove_cleanup(void (*proc) (void *context), void *context);
519 /*---------------- definitions for channels ------------------*/
521 /* Sets specific protocol options. */
522 void channel_set_options(int hostname_in_open);
525 * Allocate a new channel object and set its type and socket. Remote_name
526 * must have been allocated with xmalloc; this will free it when the channel
529 int channel_allocate(int type, int sock, char *remote_name);
531 /* Free the channel and close its socket. */
532 void channel_free(int channel);
534 /* Add any bits relevant to channels in select bitmasks. */
535 void channel_prepare_select(fd_set * readset, fd_set * writeset);
538 * After select, perform any appropriate operations for channels which have
541 void channel_after_select(fd_set * readset, fd_set * writeset);
543 /* If there is data to send to the connection, send some of it now. */
544 void channel_output_poll(void);
547 * This is called when a packet of type CHANNEL_DATA has just been received.
548 * The message type has already been consumed, but channel number and data is
551 void channel_input_data(int payload_len);
553 /* Returns true if no channel has too much buffered data. */
554 int channel_not_very_much_buffered_data(void);
556 /* This is called after receiving CHANNEL_CLOSE. */
557 void channel_input_close(void);
559 /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
560 void channel_input_close_confirmation(void);
562 /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
563 void channel_input_open_confirmation(void);
565 /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
566 void channel_input_open_failure(void);
568 /* This closes any sockets that are listening for connections; this removes
569 any unix domain sockets. */
570 void channel_stop_listening(void);
573 * Closes the sockets of all channels. This is used to close extra file
574 * descriptors after a fork.
576 void channel_close_all(void);
578 /* Returns the maximum file descriptor number used by the channels. */
579 int channel_max_fd(void);
581 /* Returns true if there is still an open channel over the connection. */
582 int channel_still_open(void);
585 * Returns a string containing a list of all open channels. The list is
586 * suitable for displaying to the user. It uses crlf instead of newlines.
587 * The caller should free the string with xfree.
589 char *channel_open_message(void);
592 * Initiate forwarding of connections to local port "port" through the secure
593 * channel to host:port from remote side. This never returns if there was an
597 channel_request_local_forwarding(u_short port, const char *host,
598 u_short remote_port, int gateway_ports);
601 * Initiate forwarding of connections to port "port" on remote host through
602 * the secure channel to host:port from local side. This never returns if
603 * there was an error. This registers that open requests for that port are
607 channel_request_remote_forwarding(u_short port, const char *host,
608 u_short remote_port);
611 * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
612 * called by the server, because the user could connect to any port anyway,
613 * and the server has no way to know but to trust the client anyway.
615 void channel_permit_all_opens(void);
618 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
619 * listening for the port, and sends back a success reply (or disconnect
620 * message if there was an error). This never returns if there was an error.
622 void channel_input_port_forward_request(int is_root);
625 * This is called after receiving PORT_OPEN message. This attempts to
626 * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
627 * or CHANNEL_OPEN_FAILURE.
629 void channel_input_port_open(int payload_len);
632 * Creates a port for X11 connections, and starts listening for it. Returns
633 * the display name, or NULL if an error was encountered.
635 char *x11_create_display(int screen);
638 * Creates an internet domain socket for listening for X11 connections.
639 * Returns a suitable value for the DISPLAY variable, or NULL if an error
642 char *x11_create_display_inet(int screen, int x11_display_offset);
645 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
646 * the remote channel number. We should do whatever we want, and respond
647 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
649 void x11_input_open(int payload_len);
652 * Requests forwarding of X11 connections. This should be called on the
655 void x11_request_forwarding(void);
658 * Requests forwarding for X11 connections, with authentication spoofing.
659 * This should be called in the client only.
661 void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
663 /* Sends a message to the server to request authentication fd forwarding. */
664 void auth_request_forwarding(void);
667 * Returns the name of the forwarded authentication socket. Returns NULL if
668 * there is no forwarded authentication socket. The returned value points to
671 char *auth_get_socket_name(void);
674 * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
675 * This starts forwarding authentication requests.
677 void auth_input_request_forwarding(struct passwd * pw);
679 /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
680 void auth_input_open_request(void);
683 * Returns true if the given string matches the pattern (which may contain ?
684 * and * as wildcards), and zero if it does not match.
686 int match_pattern(const char *s, const char *pattern);
689 * Expands tildes in the file name. Returns data allocated by xmalloc.
690 * Warning: this calls getpw*.
692 char *tilde_expand_filename(const char *filename, uid_t my_uid);
695 * Performs the interactive session. This handles data transmission between
696 * the client and the program. Note that the notion of stdin, stdout, and
697 * stderr in this function is sort of reversed: this function writes to stdin
698 * (of the child program), and reads from stdout and stderr (of the child
701 void server_loop(int pid, int fdin, int fdout, int fderr);
703 /* Client side main loop for the interactive session. */
704 int client_loop(int have_pty, int escape_char);
706 /* Linked list of custom environment strings (see auth-rsa.c). */
708 struct envstring *next;
713 * Ensure all of data on socket comes through. f==read || f==write
715 ssize_t atomicio(ssize_t (*f)(), int fd, void *s, size_t n);
720 * Performs Kerberos v4 mutual authentication with the client. This returns 0
721 * if the client could not be authenticated, and 1 if authentication was
722 * successful. This may exit if there is a serious protocol violation.
724 int auth_krb4(const char *server_user, KTEXT auth, char **client);
725 int krb4_init(uid_t uid);
726 void krb4_cleanup_proc(void *ignore);
727 int auth_krb4_password(struct passwd * pw, const char *password);
732 /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
733 int auth_kerberos_tgt(struct passwd * pw, const char *string);
734 int auth_afs_token(struct passwd * pw, const char *token_string);
736 int creds_to_radix(CREDENTIALS * creds, unsigned char *buf);
737 int radix_to_creds(const char *buf, CREDENTIALS * creds);
744 char *skey_fake_keyinfo(char *username);
745 int auth_skey_password(struct passwd * pw, const char *password);
748 /* AF_UNSPEC or AF_INET or AF_INET6 */
752 #include "auth-pam.h"