Annotation of src/usr.bin/ssh/ssh.h, Revision 1.10
1.1 deraadt 1: /*
2:
3: ssh.h
4:
5: Author: Tatu Ylonen <ylo@cs.hut.fi>
6:
7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: All rights reserved
9:
10: Created: Fri Mar 17 17:09:37 1995 ylo
11:
12: Generic header file for ssh.
13:
14: */
15:
1.10 ! markus 16: /* RCSID("$Id: ssh.h,v 1.9 1999/10/07 21:45:02 markus Exp $"); */
1.1 deraadt 17:
18: #ifndef SSH_H
19: #define SSH_H
20:
21: #include "rsa.h"
22: #include "cipher.h"
23:
24: /* The default cipher used if IDEA is not supported by the remote host.
25: It is recommended that this be one of the mandatory ciphers (DES, 3DES),
26: though that is not required. */
27: #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES
28:
29: /* Cipher used for encrypting authentication files. */
30: #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
31:
32: /* Default port number. */
33: #define SSH_DEFAULT_PORT 22
34:
35: /* Maximum number of TCP/IP ports forwarded per direction. */
36: #define SSH_MAX_FORWARDS_PER_DIRECTION 100
37:
38: /* Maximum number of RSA authentication identity files that can be specified
39: in configuration files or on the command line. */
40: #define SSH_MAX_IDENTITY_FILES 100
41:
42: /* Major protocol version. Different version indicates major incompatiblity
43: that prevents communication. */
44: #define PROTOCOL_MAJOR 1
45:
46: /* Minor protocol version. Different version indicates minor incompatibility
47: that does not prevent interoperation. */
48: #define PROTOCOL_MINOR 3
49:
50: /* Name for the service. The port named by this service overrides the default
51: port if present. */
52: #define SSH_SERVICE_NAME "ssh"
53:
1.2 deraadt 54: #define ETCDIR "/etc"
55: #define PIDDIR "/var/run"
56:
1.1 deraadt 57: /* System-wide file containing host keys of known hosts. This file should be
58: world-readable. */
59: #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
60:
61: /* HOST_KEY_FILE /etc/ssh_host_key,
62: SERVER_CONFIG_FILE /etc/sshd_config,
63: and HOST_CONFIG_FILE /etc/ssh_config
64: are all defined in Makefile.in. Of these, ssh_host_key should be readable
65: only by root, whereas ssh_config should be world-readable. */
1.2 deraadt 66:
67: #define HOST_KEY_FILE "/etc/ssh_host_key"
68: #define SERVER_CONFIG_FILE "/etc/sshd_config"
69: #define HOST_CONFIG_FILE "/etc/ssh_config"
70:
71: #define SSH_PROGRAM "/usr/bin/ssh"
1.1 deraadt 72:
73: /* The process id of the daemon listening for connections is saved
74: here to make it easier to kill the correct daemon when necessary. */
75: #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
76:
77: /* The directory in user\'s home directory in which the files reside.
78: The directory should be world-readable (though not all files are). */
79: #define SSH_USER_DIR ".ssh"
80:
81: /* Per-user file containing host keys of known hosts. This file need
82: not be readable by anyone except the user him/herself, though this does
83: not contain anything particularly secret. */
84: #define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
85:
86: /* Name of the default file containing client-side authentication key.
87: This file should only be readable by the user him/herself. */
88: #define SSH_CLIENT_IDENTITY ".ssh/identity"
89:
90: /* Configuration file in user\'s home directory. This file need not be
91: readable by anyone but the user him/herself, but does not contain
92: anything particularly secret. If the user\'s home directory resides
93: on an NFS volume where root is mapped to nobody, this may need to be
94: world-readable. */
95: #define SSH_USER_CONFFILE ".ssh/config"
96:
97: /* File containing a list of those rsa keys that permit logging in as
98: this user. This file need not be
99: readable by anyone but the user him/herself, but does not contain
100: anything particularly secret. If the user\'s home directory resides
101: on an NFS volume where root is mapped to nobody, this may need to be
102: world-readable. (This file is read by the daemon which is running as
103: root.) */
104: #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
105:
106: /* Per-user and system-wide ssh "rc" files. These files are executed with
107: /bin/sh before starting the shell or command if they exist. They
108: will be passed "proto cookie" as arguments if X11 forwarding with
109: spoofing is in use. xauth will be run if neither of these exists. */
110: #define SSH_USER_RC ".ssh/rc"
111: #define SSH_SYSTEM_RC ETCDIR "/sshrc"
112:
113: /* Ssh-only version of /etc/hosts.equiv. */
114: #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
115:
116: /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
117: rhosts authentication is enabled. */
118:
119: /* Name of the environment variable containing the pathname of the
120: authentication socket. */
121: #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTHENTICATION_SOCKET"
122:
123: /* Force host key length and server key length to differ by at least this
124: many bits. This is to make double encryption with rsaref work. */
125: #define SSH_KEY_BITS_RESERVED 128
126:
127: /* Length of the session key in bytes. (Specified as 256 bits in the
128: protocol.) */
129: #define SSH_SESSION_KEY_LENGTH 32
130:
131: /* Name of Kerberos service for SSH to use. */
132: #define KRB4_SERVICE_NAME "rcmd"
133:
134: /* Authentication methods. New types can be added, but old types should not
135: be removed for compatibility. The maximum allowed value is 31. */
136: #define SSH_AUTH_RHOSTS 1
137: #define SSH_AUTH_RSA 2
138: #define SSH_AUTH_PASSWORD 3
139: #define SSH_AUTH_RHOSTS_RSA 4
140: /* 5 is TIS */
141: #define SSH_AUTH_KERBEROS 6
142: #define SSH_PASS_KERBEROS_TGT 7
143: #define SSH_PASS_AFS_TOKEN 21
144:
145: /* Protocol flags. These are bit masks. */
146: #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
147: #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
148:
149: /* Definition of message types. New values can be added, but old values
150: should not be removed or without careful consideration of the consequences
151: for compatibility. The maximum value is 254; value 255 is reserved
152: for future extension. */
153: /* Message name */ /* msg code */ /* arguments */
154: #define SSH_MSG_NONE 0 /* no message */
155: #define SSH_MSG_DISCONNECT 1 /* cause (string) */
156: #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
1.3 provos 157: #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
1.1 deraadt 158: #define SSH_CMSG_USER 4 /* user (string) */
159: #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
1.3 provos 160: #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
161: #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
162: #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
1.1 deraadt 163: #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
164: #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
165: #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
166: #define SSH_CMSG_EXEC_SHELL 12 /* */
167: #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
168: #define SSH_SMSG_SUCCESS 14 /* */
169: #define SSH_SMSG_FAILURE 15 /* */
170: #define SSH_CMSG_STDIN_DATA 16 /* data (string) */
171: #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
172: #define SSH_SMSG_STDERR_DATA 18 /* data (string) */
173: #define SSH_CMSG_EOF 19 /* */
174: #define SSH_SMSG_EXITSTATUS 20 /* status (int) */
175: #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
176: #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
177: #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
178: #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
179: #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
180: /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
181: #define SSH_SMSG_X11_OPEN 27 /* channel (int) */
182: #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
183: #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
184: #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
185: #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
186: #define SSH_MSG_IGNORE 32 /* string */
187: #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
188: #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
189: #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
190: #define SSH_MSG_DEBUG 36 /* string */
191: #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
192:
193: #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
194: #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
195: #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
196: #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
197:
198:
199: /* Includes that need definitions above. */
200:
201: #include "readconf.h"
202:
203: /*------------ definitions for login.c -------------*/
204:
205: /* Returns the time when the user last logged in. Returns 0 if the
206: information is not available. This must be called before record_login.
207: The host from which the user logged in is stored in buf. */
208: unsigned long get_last_login_time(uid_t uid, const char *logname,
209: char *buf, unsigned int bufsize);
210:
211: /* Records that the user has logged in. This does many things normally
212: done by login(1). */
213: void record_login(int pid, const char *ttyname, const char *user, uid_t uid,
214: const char *host, struct sockaddr_in *addr);
215:
216: /* Records that the user has logged out. This does many thigs normally
217: done by login(1) or init. */
218: void record_logout(int pid, const char *ttyname);
219:
220: /*------------ definitions for sshconnect.c ----------*/
221:
222: /* Opens a TCP/IP connection to the remote server on the given host. If
223: port is 0, the default port will be used. If anonymous is zero,
224: a privileged port will be allocated to make the connection.
225: This requires super-user privileges if anonymous is false.
226: Connection_attempts specifies the maximum number of tries, one per
227: second. This returns true on success, and zero on failure. If the
228: connection is successful, this calls packet_set_connection for the
229: connection. */
1.6 provos 230: int ssh_connect(const char *host, struct sockaddr_in *hostaddr,
231: int port, int connection_attempts,
1.1 deraadt 232: int anonymous, uid_t original_real_uid,
1.3 provos 233: const char *proxy_command);
1.1 deraadt 234:
235: /* Starts a dialog with the server, and authenticates the current user on the
236: server. This does not need any extra privileges. The basic connection
237: to the server must already have been established before this is called.
238: If login fails, this function prints an error and never returns.
239: This initializes the random state, and leaves it initialized (it will also
240: have references from the packet module). */
1.6 provos 241: void ssh_login(int host_key_valid, RSA *host_key, const char *host,
242: struct sockaddr_in *hostaddr, Options *options,
243: uid_t original_real_uid);
1.1 deraadt 244:
245: /*------------ Definitions for various authentication methods. -------*/
246:
247: /* Tries to authenticate the user using the .rhosts file. Returns true if
248: authentication succeeds. If ignore_rhosts is non-zero, this will not
249: consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
250: If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
251: int auth_rhosts(struct passwd *pw, const char *client_user,
252: int ignore_rhosts, int strict_modes);
253:
254: /* Tries to authenticate the user using the .rhosts file and the host using
255: its host key. Returns true if authentication succeeds. */
1.3 provos 256: int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
257: unsigned int bits, BIGNUM *client_host_key_e,
258: BIGNUM *client_host_key_n, int ignore_rhosts,
1.1 deraadt 259: int strict_modes);
260:
261: /* Tries to authenticate the user using password. Returns true if
262: authentication succeeds. */
1.9 markus 263: int auth_password(struct passwd *pw, const char *password);
1.1 deraadt 264:
265: /* Performs the RSA authentication dialog with the client. This returns
266: 0 if the client could not be authenticated, and 1 if authentication was
267: successful. This may exit if there is a serious protocol violation. */
1.10 ! markus 268: int auth_rsa(struct passwd *pw, BIGNUM *client_n, int strict_modes);
1.1 deraadt 269:
270: /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
271: over the key. Skips any whitespace at the beginning and at end. */
1.3 provos 272: int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM *e, BIGNUM *n);
1.1 deraadt 273:
274: /* Returns the name of the machine at the other end of the socket. The
275: returned string should be freed by the caller. */
276: char *get_remote_hostname(int socket);
277:
278: /* Return the canonical name of the host in the other side of the current
279: connection (as returned by packet_get_connection). The host name is
280: cached, so it is efficient to call this several times. */
281: const char *get_canonical_hostname(void);
282:
283: /* Returns the remote IP address as an ascii string. The value need not be
284: freed by the caller. */
285: const char *get_remote_ipaddr(void);
286:
287: /* Returns the port number of the peer of the socket. */
288: int get_peer_port(int sock);
289:
290: /* Returns the port number of the remote host. */
291: int get_remote_port(void);
292:
293: /* Tries to match the host name (which must be in all lowercase) against the
294: comma-separated sequence of subpatterns (each possibly preceded by ! to
295: indicate negation). Returns true if there is a positive match; zero
296: otherwise. */
297: int match_hostname(const char *host, const char *pattern, unsigned int len);
298:
299: /* Checks whether the given host is already in the list of our known hosts.
300: Returns HOST_OK if the host is known and has the specified key,
301: HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
302: but used to have a different host key. The host must be in all lowercase. */
1.6 provos 303: typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED, HOST_DIFFER } HostStatus;
1.1 deraadt 304: HostStatus check_host_in_hostfile(const char *filename,
305: const char *host, unsigned int bits,
1.6 provos 306: BIGNUM *e, BIGNUM *n,
307: BIGNUM *ke, BIGNUM *kn);
1.1 deraadt 308:
309: /* Appends an entry to the host file. Returns false if the entry
310: could not be appended. */
311: int add_host_to_hostfile(const char *filename, const char *host,
1.3 provos 312: unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 313:
314: /* Performs the RSA authentication challenge-response dialog with the client,
315: and returns true (non-zero) if the client gave the correct answer to
316: our challenge; returns zero if the client gives a wrong answer. */
1.3 provos 317: int auth_rsa_challenge_dialog(unsigned int bits, BIGNUM *e, BIGNUM *n);
1.1 deraadt 318:
319: /* Reads a passphrase from /dev/tty with echo turned off. Returns the
320: passphrase (allocated with xmalloc). Exits if EOF is encountered.
321: If from_stdin is true, the passphrase will be read from stdin instead. */
322: char *read_passphrase(const char *prompt, int from_stdin);
323:
324: /* Saves the authentication (private) key in a file, encrypting it with
325: passphrase. The identification of the file (lowest 64 bits of n)
326: will precede the key to provide identification of the key without
327: needing a passphrase. */
328: int save_private_key(const char *filename, const char *passphrase,
1.3 provos 329: RSA *private_key, const char *comment);
1.1 deraadt 330:
331: /* Loads the public part of the key file (public key and comment).
332: Returns 0 if an error occurred; zero if the public key was successfully
333: read. The comment of the key is returned in comment_return if it is
334: non-NULL; the caller must free the value with xfree. */
1.3 provos 335: int load_public_key(const char *filename, RSA *pub,
1.1 deraadt 336: char **comment_return);
337:
338: /* Loads the private key from the file. Returns 0 if an error is encountered
339: (file does not exist or is not readable, or passphrase is bad).
340: This initializes the private key. The comment of the key is returned
341: in comment_return if it is non-NULL; the caller must free the value
342: with xfree. */
343: int load_private_key(const char *filename, const char *passphrase,
1.3 provos 344: RSA *private_key, char **comment_return);
1.1 deraadt 345:
346: /*------------ Definitions for logging. -----------------------*/
347:
348: /* Supported syslog facilities. */
349: typedef enum
350: {
351: SYSLOG_FACILITY_DAEMON,
352: SYSLOG_FACILITY_USER,
353: SYSLOG_FACILITY_AUTH,
354: SYSLOG_FACILITY_LOCAL0,
355: SYSLOG_FACILITY_LOCAL1,
356: SYSLOG_FACILITY_LOCAL2,
357: SYSLOG_FACILITY_LOCAL3,
358: SYSLOG_FACILITY_LOCAL4,
359: SYSLOG_FACILITY_LOCAL5,
360: SYSLOG_FACILITY_LOCAL6,
361: SYSLOG_FACILITY_LOCAL7
362: } SyslogFacility;
363:
364: /* Initializes logging. If debug is non-zero, debug() will output something.
365: If quiet is non-zero, none of these will log send anything to syslog
366: (but maybe to stderr). */
367: void log_init(char *av0, int on_stderr, int debug, int quiet,
368: SyslogFacility facility);
369:
370: /* Outputs a message to syslog or stderr, depending on the implementation.
371: The format must guarantee that the final message does not exceed 1024
372: characters. The message should not contain newline. */
373: void log(const char *fmt, ...);
374:
375: /* Outputs a message to syslog or stderr, depending on the implementation.
376: The format must guarantee that the final message does not exceed 1024
377: characters. The message should not contain newline. */
378: void debug(const char *fmt, ...);
379:
380: /* Outputs a message to syslog or stderr, depending on the implementation.
381: The format must guarantee that the final message does not exceed 1024
382: characters. The message should not contain newline. */
383: void error(const char *fmt, ...);
384:
385: /* Outputs a message to syslog or stderr, depending on the implementation.
386: The format must guarantee that the final message does not exceed 1024
387: characters. The message should not contain newline.
388: This call never returns. */
389: void fatal(const char *fmt, ...);
390:
391: /* Registers a cleanup function to be called by fatal() before exiting.
392: It is permissible to call fatal_remove_cleanup for the function itself
393: from the function. */
394: void fatal_add_cleanup(void (*proc)(void *context), void *context);
395:
396: /* Removes a cleanup frunction to be called at fatal(). */
397: void fatal_remove_cleanup(void (*proc)(void *context), void *context);
398:
399: /*---------------- definitions for x11.c ------------------*/
400:
401:
402: /* Sets specific protocol options. */
403: void channel_set_options(int hostname_in_open);
404:
405: /* Allocate a new channel object and set its type and socket. Remote_name
406: must have been allocated with xmalloc; this will free it when the channel
407: is freed. */
408: int channel_allocate(int type, int sock, char *remote_name);
409:
410: /* Free the channel and close its socket. */
411: void channel_free(int channel);
412:
413: /* Add any bits relevant to channels in select bitmasks. */
414: void channel_prepare_select(fd_set *readset, fd_set *writeset);
415:
416: /* After select, perform any appropriate operations for channels which
417: have events pending. */
418: void channel_after_select(fd_set *readset, fd_set *writeset);
419:
420: /* If there is data to send to the connection, send some of it now. */
421: void channel_output_poll(void);
422:
423: /* This is called when a packet of type CHANNEL_DATA has just been received.
424: The message type has already been consumed, but channel number and data
425: is still there. */
426: void channel_input_data(int payload_len);
427:
428: /* Returns true if no channel has too much buffered data. */
429: int channel_not_very_much_buffered_data(void);
430:
431: /* This is called after receiving CHANNEL_CLOSE. */
432: void channel_input_close(void);
433:
434: /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
435: void channel_input_close_confirmation(void);
436:
437: /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
438: void channel_input_open_confirmation(void);
439:
440: /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
441: void channel_input_open_failure(void);
442:
443: /* This closes any sockets that are listening for connections; this removes
444: any unix domain sockets. */
445: void channel_stop_listening(void);
446:
447: /* Closes the sockets of all channels. This is used to close extra file
448: descriptors after a fork. */
449: void channel_close_all(void);
450:
451: /* Returns the maximum file descriptor number used by the channels. */
452: int channel_max_fd(void);
453:
454: /* Returns true if there is still an open channel over the connection. */
455: int channel_still_open(void);
456:
457: /* Returns a string containing a list of all open channels. The list is
458: suitable for displaying to the user. It uses crlf instead of newlines.
459: The caller should free the string with xfree. */
460: char *channel_open_message(void);
461:
462: /* Initiate forwarding of connections to local port "port" through the secure
463: channel to host:port from remote side. This never returns if there
464: was an error. */
465: void channel_request_local_forwarding(int port, const char *host,
466: int remote_port);
467:
468: /* Initiate forwarding of connections to port "port" on remote host through
469: the secure channel to host:port from local side. This never returns
470: if there was an error. This registers that open requests for that
471: port are permitted. */
472: void channel_request_remote_forwarding(int port, const char *host,
473: int remote_port);
474:
475: /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
476: called by the server, because the user could connect to any port anyway,
477: and the server has no way to know but to trust the client anyway. */
478: void channel_permit_all_opens(void);
479:
480: /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
481: listening for the port, and sends back a success reply (or disconnect
482: message if there was an error). This never returns if there was an
483: error. */
484: void channel_input_port_forward_request(int is_root);
485:
486: /* This is called after receiving PORT_OPEN message. This attempts to connect
487: to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
488: CHANNEL_OPEN_FAILURE. */
489: void channel_input_port_open(int payload_len);
490:
491: /* Creates a port for X11 connections, and starts listening for it.
492: Returns the display name, or NULL if an error was encountered. */
493: char *x11_create_display(int screen);
494:
495: /* Creates an internet domain socket for listening for X11 connections.
496: Returns a suitable value for the DISPLAY variable, or NULL if an error
497: occurs. */
498: char *x11_create_display_inet(int screen);
499:
500: /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
501: the remote channel number. We should do whatever we want, and respond
502: with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
503: void x11_input_open(int payload_len);
504:
505: /* Requests forwarding of X11 connections. This should be called on the
506: client only. */
507: void x11_request_forwarding(void);
508:
509: /* Requests forwarding for X11 connections, with authentication spoofing.
510: This should be called in the client only. */
1.3 provos 511: void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
1.1 deraadt 512:
513: /* Local Xauthority file (server only). */
514: extern char *xauthfile;
515:
516: /* Sends a message to the server to request authentication fd forwarding. */
517: void auth_request_forwarding(void);
518:
519: /* Returns the number of the file descriptor to pass to child programs as
520: the authentication fd. */
521: int auth_get_fd(void);
522:
523: /* Returns the name of the forwarded authentication socket. Returns NULL
524: if there is no forwarded authentication socket. The returned value points
525: to a static buffer. */
526: char *auth_get_socket_name(void);
527:
528: /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
529: This starts forwarding authentication requests. */
530: void auth_input_request_forwarding(struct passwd *pw);
531:
532: /* This is called to process an SSH_SMSG_AGENT_OPEN message. */
533: void auth_input_open_request(void);
534:
535: /* Returns true if the given string matches the pattern (which may contain
536: ? and * as wildcards), and zero if it does not match. */
537: int match_pattern(const char *s, const char *pattern);
538:
539: /* Expands tildes in the file name. Returns data allocated by xmalloc.
540: Warning: this calls getpw*. */
541: char *tilde_expand_filename(const char *filename, uid_t my_uid);
542:
543: /* Gets a file descriptor that won't get closed by shell pathname.
544: If pathname is NULL, the path is inferred from the SHELL environment
545: variable or the user id. */
546: int get_permanent_fd(const char *pathname);
547:
548: /* Performs the interactive session. This handles data transmission between
549: the client and the program. Note that the notion of stdin, stdout, and
550: stderr in this function is sort of reversed: this function writes to
551: stdin (of the child program), and reads from stdout and stderr (of the
552: child program). */
553: void server_loop(int pid, int fdin, int fdout, int fderr);
554:
555: /* Client side main loop for the interactive session. */
556: int client_loop(int have_pty, int escape_char);
557:
558: /* Linked list of custom environment strings (see auth-rsa.c). */
559: struct envstring {
560: struct envstring *next;
561: char *s;
562: };
563:
564: #ifdef KRB4
565: #include <krb.h>
566:
1.4 dugsong 567: /* Performs Kerberos v4 mutual authentication with the client. This returns
568: 0 if the client could not be authenticated, and 1 if authentication was
569: successful. This may exit if there is a serious protocol violation. */
570: int auth_krb4(const char *server_user, KTEXT auth, char **client);
1.1 deraadt 571: int ssh_tf_init(uid_t uid);
1.4 dugsong 572:
573: #ifdef AFS
574: #include <kafs.h>
575:
576: /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
1.1 deraadt 577: int auth_kerberos_tgt(struct passwd *pw, const char *string);
578: int auth_afs_token(char *server_user, uid_t uid, const char *string);
579:
580: int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
581: int radix_to_creds(const char *buf, CREDENTIALS *creds);
1.4 dugsong 582: #endif /* AFS */
1.1 deraadt 583:
584: #endif /* KRB4 */
1.9 markus 585:
586: #ifdef SKEY
587: #include <skey.h>
588: char *skey_fake_keyinfo(char *username);
589: #endif /* SKEY */
1.1 deraadt 590:
591: #endif /* SSH_H */
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