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 * $FreeBSD$ 15 */ 16 17 /* RCSID("$Id: ssh.h,v 1.34 2000/03/23 22:15:33 markus Exp $"); */ 18 19 #ifndef SSH_H 20 #define SSH_H 21 22 #include "rsa.h" 23 #include "cipher.h" 24 25 /* 26 * The default cipher used if IDEA is not supported by the remote host. It is 27 * recommended that this be one of the mandatory ciphers (DES, 3DES), though 28 * that is not required. 29 */ 30 #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES 31 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 41 /* 42 * Maximum number of RSA authentication identity files that can be specified 43 * in configuration files or on the command line. 44 */ 45 #define SSH_MAX_IDENTITY_FILES 100 46 47 /* 48 * Major protocol version. Different version indicates major incompatiblity 49 * that prevents communication. 50 */ 51 #define PROTOCOL_MAJOR 1 52 53 /* 54 * Minor protocol version. Different version indicates minor incompatibility 55 * that does not prevent interoperation. 56 */ 57 #define PROTOCOL_MINOR 5 58 59 /* 60 * Name for the service. The port named by this service overrides the 61 * default port if present. 62 */ 63 #define SSH_SERVICE_NAME "ssh" 64 65 #define ETCDIR "/etc/ssh" 66 #define PIDDIR "/var/run" 67 68 /* 69 * System-wide file containing host keys of known hosts. This file should be 70 * world-readable. 71 */ 72 #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" 73 74 /* 75 * Of these, ssh_host_key must be readable only by root, whereas ssh_config 76 * should be world-readable. 77 */ 78 #define HOST_KEY_FILE ETCDIR "/ssh_host_key" 79 #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" 80 #define HOST_CONFIG_FILE ETCDIR "/ssh_config" 81 82 #define SSH_PROGRAM "/usr/bin/ssh" 83 84 /* 85 * The process id of the daemon listening for connections is saved here to 86 * make it easier to kill the correct daemon when necessary. 87 */ 88 #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" 89 90 /* 91 * The directory in user\'s home directory in which the files reside. The 92 * directory should be world-readable (though not all files are). 93 */ 94 #define SSH_USER_DIR ".ssh" 95 96 /* 97 * Per-user file containing host keys of known hosts. This file need not be 98 * readable by anyone except the user him/herself, though this does not 99 * contain anything particularly secret. 100 */ 101 #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" 102 103 /* 104 * Name of the default file containing client-side authentication key. This 105 * file should only be readable by the user him/herself. 106 */ 107 #define SSH_CLIENT_IDENTITY ".ssh/identity" 108 109 /* 110 * Configuration file in user\'s home directory. This file need not be 111 * readable by anyone but the user him/herself, but does not contain anything 112 * particularly secret. If the user\'s home directory resides on an NFS 113 * volume where root is mapped to nobody, this may need to be world-readable. 114 */ 115 #define SSH_USER_CONFFILE ".ssh/config" 116 117 /* 118 * File containing a list of those rsa keys that permit logging in as this 119 * user. This file need not be readable by anyone but the user him/herself, 120 * but does not contain anything particularly secret. If the user\'s home 121 * directory resides on an NFS volume where root is mapped to nobody, this 122 * may need to be world-readable. (This file is read by the daemon which is 123 * running as root.) 124 */ 125 #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" 126 127 /* 128 * Per-user and system-wide ssh "rc" files. These files are executed with 129 * /bin/sh before starting the shell or command if they exist. They will be 130 * passed "proto cookie" as arguments if X11 forwarding with spoofing is in 131 * use. xauth will be run if neither of these exists. 132 */ 133 #define SSH_USER_RC ".ssh/rc" 134 #define SSH_SYSTEM_RC ETCDIR "/sshrc" 135 136 /* 137 * Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use 138 * ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled. 139 */ 140 #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" 141 142 /* 143 * Name of the environment variable containing the pathname of the 144 * authentication socket. 145 */ 146 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" 147 148 /* 149 * Name of the environment variable containing the pathname of the 150 * authentication socket. 151 */ 152 #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" 153 154 /* 155 * Default path to ssh-askpass used by ssh-add, 156 * environment variable for overwriting the default location 157 */ 158 #define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass" 159 #define SSH_ASKPASS_ENV "SSH_ASKPASS" 160 161 /* 162 * Force host key length and server key length to differ by at least this 163 * many bits. This is to make double encryption with rsaref work. 164 */ 165 #define SSH_KEY_BITS_RESERVED 128 166 167 /* 168 * Length of the session key in bytes. (Specified as 256 bits in the 169 * protocol.) 170 */ 171 #define SSH_SESSION_KEY_LENGTH 32 172 173 /* Name of Kerberos service for SSH to use. */ 174 #define KRB4_SERVICE_NAME "rcmd" 175 176 /* 177 * Authentication methods. New types can be added, but old types should not 178 * be removed for compatibility. The maximum allowed value is 31. 179 */ 180 #define SSH_AUTH_RHOSTS 1 181 #define SSH_AUTH_RSA 2 182 #define SSH_AUTH_PASSWORD 3 183 #define SSH_AUTH_RHOSTS_RSA 4 184 #define SSH_AUTH_TIS 5 185 #define SSH_AUTH_KRB4 6 186 #define SSH_PASS_KRB4_TGT 7 187 /* 8 to 15 are reserved */ 188 #define SSH_PASS_AFS_TOKEN 21 189 190 #define SSH_AUTH_KRB5 29 191 #define SSH_PASS_KRB5_TGT 30 192 193 /* Protocol flags. These are bit masks. */ 194 #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ 195 #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ 196 197 /* 198 * Definition of message types. New values can be added, but old values 199 * should not be removed or without careful consideration of the consequences 200 * for compatibility. The maximum value is 254; value 255 is reserved for 201 * future extension. 202 */ 203 /* Message name */ /* msg code */ /* arguments */ 204 #define SSH_MSG_NONE 0 /* no message */ 205 #define SSH_MSG_DISCONNECT 1 /* cause (string) */ 206 #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ 207 #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ 208 #define SSH_CMSG_USER 4 /* user (string) */ 209 #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ 210 #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ 211 #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ 212 #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ 213 #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ 214 #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ 215 #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ 216 #define SSH_CMSG_EXEC_SHELL 12 /* */ 217 #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ 218 #define SSH_SMSG_SUCCESS 14 /* */ 219 #define SSH_SMSG_FAILURE 15 /* */ 220 #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ 221 #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ 222 #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ 223 #define SSH_CMSG_EOF 19 /* */ 224 #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ 225 #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ 226 #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ 227 #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ 228 #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ 229 #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ 230 /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ 231 #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ 232 #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ 233 #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ 234 #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ 235 #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ 236 #define SSH_MSG_IGNORE 32 /* string */ 237 #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ 238 #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ 239 #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ 240 #define SSH_MSG_DEBUG 36 /* string */ 241 #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ 242 #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ 243 #define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */ 244 #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */ 245 #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */ 246 #define SSH_CMSG_AUTH_KRB4 42 /* (KTEXT) */ 247 #define SSH_SMSG_AUTH_KRB4_RESPONSE 43 /* (KTEXT) */ 248 #define SSH_CMSG_HAVE_KRB4_TGT 44 /* credentials (s) */ 249 #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ 250 251 #define SSH_CMSG_AUTH_KRB5 110 252 #define SSH_SMSG_AUTH_KRB5_RESPONSE 111 253 #define SSH_CMSG_HAVE_KRB5_TGT 112 254 255 /*------------ definitions for login.c -------------*/ 256 257 /* 258 * Returns the time when the user last logged in. Returns 0 if the 259 * information is not available. This must be called before record_login. 260 * The host from which the user logged in is stored in buf. 261 */ 262 unsigned long 263 get_last_login_time(uid_t uid, const char *logname, 264 char *buf, unsigned int bufsize); 265 266 /* 267 * Records that the user has logged in. This does many things normally done 268 * by login(1). 269 */ 270 void 271 record_login(int pid, const char *ttyname, const char *user, uid_t uid, 272 const char *host, struct sockaddr *addr); 273 274 /* 275 * Records that the user has logged out. This does many thigs normally done 276 * by login(1) or init. 277 */ 278 void record_logout(int pid, const char *ttyname); 279 280 /*------------ definitions for sshconnect.c ----------*/ 281 282 /* 283 * Opens a TCP/IP connection to the remote server on the given host. If port 284 * is 0, the default port will be used. If anonymous is zero, a privileged 285 * port will be allocated to make the connection. This requires super-user 286 * privileges if anonymous is false. Connection_attempts specifies the 287 * maximum number of tries, one per second. This returns true on success, 288 * and zero on failure. If the connection is successful, this calls 289 * packet_set_connection for the connection. 290 */ 291 int 292 ssh_connect(const char *host, struct sockaddr_storage * hostaddr, 293 u_short port, int connection_attempts, 294 int anonymous, uid_t original_real_uid, 295 const char *proxy_command); 296 297 /* 298 * Starts a dialog with the server, and authenticates the current user on the 299 * server. This does not need any extra privileges. The basic connection to 300 * the server must already have been established before this is called. If 301 * login fails, this function prints an error and never returns. This 302 * initializes the random state, and leaves it initialized (it will also have 303 * references from the packet module). 304 */ 305 306 void 307 ssh_login(int host_key_valid, RSA * host_key, const char *host, 308 struct sockaddr * hostaddr, uid_t original_real_uid); 309 310 /*------------ Definitions for various authentication methods. -------*/ 311 312 /* 313 * Tries to authenticate the user using the .rhosts file. Returns true if 314 * authentication succeeds. If ignore_rhosts is non-zero, this will not 315 * consider .rhosts and .shosts (/etc/hosts.equiv will still be used). 316 */ 317 int auth_rhosts(struct passwd * pw, const char *client_user); 318 319 /* 320 * Tries to authenticate the user using the .rhosts file and the host using 321 * its host key. Returns true if authentication succeeds. 322 */ 323 int 324 auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key); 325 326 /* 327 * Tries to authenticate the user using password. Returns true if 328 * authentication succeeds. 329 */ 330 int auth_password(struct passwd * pw, const char *password); 331 332 /* 333 * Performs the RSA authentication dialog with the client. This returns 0 if 334 * the client could not be authenticated, and 1 if authentication was 335 * successful. This may exit if there is a serious protocol violation. 336 */ 337 int auth_rsa(struct passwd * pw, BIGNUM * client_n); 338 339 /* 340 * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer 341 * over the key. Skips any whitespace at the beginning and at end. 342 */ 343 int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n); 344 345 /* 346 * Returns the name of the machine at the other end of the socket. The 347 * returned string should be freed by the caller. 348 */ 349 char *get_remote_hostname(int socket); 350 351 /* 352 * Return the canonical name of the host in the other side of the current 353 * connection (as returned by packet_get_connection). The host name is 354 * cached, so it is efficient to call this several times. 355 */ 356 const char *get_canonical_hostname(void); 357 358 /* 359 * Returns the remote IP address as an ascii string. The value need not be 360 * freed by the caller. 361 */ 362 const char *get_remote_ipaddr(void); 363 364 /* Returns the port number of the peer of the socket. */ 365 int get_peer_port(int sock); 366 367 /* Returns the port number of the remote/local host. */ 368 int get_remote_port(void); 369 int get_local_port(void); 370 371 372 /* 373 * Performs the RSA authentication challenge-response dialog with the client, 374 * and returns true (non-zero) if the client gave the correct answer to our 375 * challenge; returns zero if the client gives a wrong answer. 376 */ 377 int auth_rsa_challenge_dialog(RSA *pk); 378 379 /* 380 * Reads a passphrase from /dev/tty with echo turned off. Returns the 381 * passphrase (allocated with xmalloc). Exits if EOF is encountered. If 382 * from_stdin is true, the passphrase will be read from stdin instead. 383 */ 384 char *read_passphrase(const char *prompt, int from_stdin); 385 386 /* 387 * Saves the authentication (private) key in a file, encrypting it with 388 * passphrase. The identification of the file (lowest 64 bits of n) will 389 * precede the key to provide identification of the key without needing a 390 * passphrase. 391 */ 392 int 393 save_private_key(const char *filename, const char *passphrase, 394 RSA * private_key, const char *comment); 395 396 /* 397 * Loads the public part of the key file (public key and comment). Returns 0 398 * if an error occurred; zero if the public key was successfully read. The 399 * comment of the key is returned in comment_return if it is non-NULL; the 400 * caller must free the value with xfree. 401 */ 402 int 403 load_public_key(const char *filename, RSA * pub, 404 char **comment_return); 405 406 /* 407 * Loads the private key from the file. Returns 0 if an error is encountered 408 * (file does not exist or is not readable, or passphrase is bad). This 409 * initializes the private key. The comment of the key is returned in 410 * comment_return if it is non-NULL; the caller must free the value with 411 * xfree. 412 */ 413 int 414 load_private_key(const char *filename, const char *passphrase, 415 RSA * private_key, char **comment_return); 416 417 /*------------ Definitions for logging. -----------------------*/ 418 419 /* Supported syslog facilities and levels. */ 420 typedef enum { 421 SYSLOG_FACILITY_DAEMON, 422 SYSLOG_FACILITY_USER, 423 SYSLOG_FACILITY_AUTH, 424 SYSLOG_FACILITY_LOCAL0, 425 SYSLOG_FACILITY_LOCAL1, 426 SYSLOG_FACILITY_LOCAL2, 427 SYSLOG_FACILITY_LOCAL3, 428 SYSLOG_FACILITY_LOCAL4, 429 SYSLOG_FACILITY_LOCAL5, 430 SYSLOG_FACILITY_LOCAL6, 431 SYSLOG_FACILITY_LOCAL7 432 } SyslogFacility; 433 434 typedef enum { 435 SYSLOG_LEVEL_QUIET, 436 SYSLOG_LEVEL_FATAL, 437 SYSLOG_LEVEL_ERROR, 438 SYSLOG_LEVEL_INFO, 439 SYSLOG_LEVEL_VERBOSE, 440 SYSLOG_LEVEL_DEBUG 441 } LogLevel; 442 /* Initializes logging. */ 443 void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr); 444 445 /* Logging implementation, depending on server or client */ 446 void do_log(LogLevel level, const char *fmt, va_list args); 447 448 /* name to facility/level */ 449 SyslogFacility log_facility_number(char *name); 450 LogLevel log_level_number(char *name); 451 452 /* Output a message to syslog or stderr */ 453 void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2))); 454 void error(const char *fmt,...) __attribute__((format(printf, 1, 2))); 455 void log(const char *fmt,...) __attribute__((format(printf, 1, 2))); 456 void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2))); 457 void debug(const char *fmt,...) __attribute__((format(printf, 1, 2))); 458 459 /* same as fatal() but w/o logging */ 460 void fatal_cleanup(void); 461 462 /* 463 * Registers a cleanup function to be called by fatal()/fatal_cleanup() 464 * before exiting. It is permissible to call fatal_remove_cleanup for the 465 * function itself from the function. 466 */ 467 void fatal_add_cleanup(void (*proc) (void *context), void *context); 468 469 /* Removes a cleanup function to be called at fatal(). */ 470 void fatal_remove_cleanup(void (*proc) (void *context), void *context); 471 472 /*---------------- definitions for channels ------------------*/ 473 474 /* Sets specific protocol options. */ 475 void channel_set_options(int hostname_in_open); 476 477 /* 478 * Allocate a new channel object and set its type and socket. Remote_name 479 * must have been allocated with xmalloc; this will free it when the channel 480 * is freed. 481 */ 482 int channel_allocate(int type, int sock, char *remote_name); 483 484 /* Free the channel and close its socket. */ 485 void channel_free(int channel); 486 487 /* Add any bits relevant to channels in select bitmasks. */ 488 void channel_prepare_select(fd_set * readset, fd_set * writeset); 489 490 /* 491 * After select, perform any appropriate operations for channels which have 492 * events pending. 493 */ 494 void channel_after_select(fd_set * readset, fd_set * writeset); 495 496 /* If there is data to send to the connection, send some of it now. */ 497 void channel_output_poll(void); 498 499 /* 500 * This is called when a packet of type CHANNEL_DATA has just been received. 501 * The message type has already been consumed, but channel number and data is 502 * still there. 503 */ 504 void channel_input_data(int payload_len); 505 506 /* Returns true if no channel has too much buffered data. */ 507 int channel_not_very_much_buffered_data(void); 508 509 /* This is called after receiving CHANNEL_CLOSE. */ 510 void channel_input_close(void); 511 512 /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */ 513 void channel_input_close_confirmation(void); 514 515 /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */ 516 void channel_input_open_confirmation(void); 517 518 /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */ 519 void channel_input_open_failure(void); 520 521 /* This closes any sockets that are listening for connections; this removes 522 any unix domain sockets. */ 523 void channel_stop_listening(void); 524 525 /* 526 * Closes the sockets of all channels. This is used to close extra file 527 * descriptors after a fork. 528 */ 529 void channel_close_all(void); 530 531 /* Returns the maximum file descriptor number used by the channels. */ 532 int channel_max_fd(void); 533 534 /* Returns true if there is still an open channel over the connection. */ 535 int channel_still_open(void); 536 537 /* 538 * Returns a string containing a list of all open channels. The list is 539 * suitable for displaying to the user. It uses crlf instead of newlines. 540 * The caller should free the string with xfree. 541 */ 542 char *channel_open_message(void); 543 544 /* 545 * Initiate forwarding of connections to local port "port" through the secure 546 * channel to host:port from remote side. This never returns if there was an 547 * error. 548 */ 549 void 550 channel_request_local_forwarding(u_short port, const char *host, 551 u_short remote_port, int gateway_ports); 552 553 /* 554 * Initiate forwarding of connections to port "port" on remote host through 555 * the secure channel to host:port from local side. This never returns if 556 * there was an error. This registers that open requests for that port are 557 * permitted. 558 */ 559 void 560 channel_request_remote_forwarding(u_short port, const char *host, 561 u_short remote_port); 562 563 /* 564 * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually 565 * called by the server, because the user could connect to any port anyway, 566 * and the server has no way to know but to trust the client anyway. 567 */ 568 void channel_permit_all_opens(void); 569 570 /* 571 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates 572 * listening for the port, and sends back a success reply (or disconnect 573 * message if there was an error). This never returns if there was an error. 574 */ 575 void channel_input_port_forward_request(int is_root); 576 577 /* 578 * This is called after receiving PORT_OPEN message. This attempts to 579 * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION 580 * or CHANNEL_OPEN_FAILURE. 581 */ 582 void channel_input_port_open(int payload_len); 583 584 /* 585 * Creates a port for X11 connections, and starts listening for it. Returns 586 * the display name, or NULL if an error was encountered. 587 */ 588 char *x11_create_display(int screen); 589 590 /* 591 * Creates an internet domain socket for listening for X11 connections. 592 * Returns a suitable value for the DISPLAY variable, or NULL if an error 593 * occurs. 594 */ 595 char *x11_create_display_inet(int screen, int x11_display_offset); 596 597 /* 598 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains 599 * the remote channel number. We should do whatever we want, and respond 600 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. 601 */ 602 void x11_input_open(int payload_len); 603 604 /* 605 * Requests forwarding of X11 connections. This should be called on the 606 * client only. 607 */ 608 void x11_request_forwarding(void); 609 610 /* 611 * Requests forwarding for X11 connections, with authentication spoofing. 612 * This should be called in the client only. 613 */ 614 void x11_request_forwarding_with_spoofing(const char *proto, const char *data); 615 616 /* Sends a message to the server to request authentication fd forwarding. */ 617 void auth_request_forwarding(void); 618 619 /* 620 * Returns the name of the forwarded authentication socket. Returns NULL if 621 * there is no forwarded authentication socket. The returned value points to 622 * a static buffer. 623 */ 624 char *auth_get_socket_name(void); 625 626 /* 627 * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. 628 * This starts forwarding authentication requests. 629 */ 630 void auth_input_request_forwarding(struct passwd * pw); 631 632 /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ 633 void auth_input_open_request(void); 634 635 /* 636 * Returns true if the given string matches the pattern (which may contain ? 637 * and * as wildcards), and zero if it does not match. 638 */ 639 int match_pattern(const char *s, const char *pattern); 640 641 /* 642 * Expands tildes in the file name. Returns data allocated by xmalloc. 643 * Warning: this calls getpw*. 644 */ 645 char *tilde_expand_filename(const char *filename, uid_t my_uid); 646 647 /* 648 * Performs the interactive session. This handles data transmission between 649 * the client and the program. Note that the notion of stdin, stdout, and 650 * stderr in this function is sort of reversed: this function writes to stdin 651 * (of the child program), and reads from stdout and stderr (of the child 652 * program). 653 */ 654 void server_loop(int pid, int fdin, int fdout, int fderr); 655 656 /* Client side main loop for the interactive session. */ 657 int client_loop(int have_pty, int escape_char); 658 659 /* Linked list of custom environment strings (see auth-rsa.c). */ 660 struct envstring { 661 struct envstring *next; 662 char *s; 663 }; 664 665 /* 666 * Ensure all of data on socket comes through. f==read || f==write 667 */ 668 ssize_t atomicio(ssize_t (*f)(), int fd, void *s, size_t n); 669 670 #ifdef KRB5 671 #include <krb5.h> 672 int auth_krb5(); /* XXX Doplnit prototypy */ 673 int auth_krb5_tgt(); 674 int krb5_init(); 675 void krb5_cleanup_proc(void *ignore); 676 int auth_krb5_password(struct passwd *pw, const char *password); 677 #endif /* KRB5 */ 678 679 #ifdef KRB4 680 #include <krb.h> 681 /* 682 * Performs Kerberos v4 mutual authentication with the client. This returns 0 683 * if the client could not be authenticated, and 1 if authentication was 684 * successful. This may exit if there is a serious protocol violation. 685 */ 686 int auth_krb4(const char *server_user, KTEXT auth, char **client); 687 int krb4_init(uid_t uid); 688 void krb4_cleanup_proc(void *ignore); 689 int auth_krb4_password(struct passwd * pw, const char *password); 690 691 #ifdef AFS 692 #include <kafs.h> 693 694 /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ 695 int auth_krb4_tgt(struct passwd * pw, const char *string); 696 int auth_afs_token(struct passwd * pw, const char *token_string); 697 698 int creds_to_radix(CREDENTIALS * creds, unsigned char *buf); 699 int radix_to_creds(const char *buf, CREDENTIALS * creds); 700 #endif /* AFS */ 701 702 #endif /* KRB4 */ 703 704 #ifdef SKEY 705 #include <skey.h> 706 char *skey_fake_keyinfo(char *username); 707 int auth_skey_password(struct passwd * pw, const char *password); 708 #endif /* SKEY */ 709 710 /* AF_UNSPEC or AF_INET or AF_INET6 */ 711 extern int IPv4or6; 712 713 #endif /* SSH_H */ 714