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NetBSD/crypto/dist/ssh/ssh.h

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/* $NetBSD: ssh.h,v 1.2 2000/10/05 14:09:08 sommerfeld Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* Generic header file for ssh.
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
/* from OpenBSD: ssh.h,v 1.51 2000/09/12 20:53:10 markus Exp */
#ifndef SSH_H
#define SSH_H
#include "rsa.h"
#include "cipher.h"
/*
* XXX
* The default cipher used if IDEA is not supported by the remote host. It is
* recommended that this be one of the mandatory ciphers (DES, 3DES), though
* that is not required.
*/
#define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES
/* Cipher used for encrypting authentication files. */
#define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
/* Default port number. */
#define SSH_DEFAULT_PORT 22
/* Maximum number of TCP/IP ports forwarded per direction. */
#define SSH_MAX_FORWARDS_PER_DIRECTION 100
/*
* Maximum number of RSA authentication identity files that can be specified
* in configuration files or on the command line.
*/
#define SSH_MAX_IDENTITY_FILES 100
/*
* Major protocol version. Different version indicates major incompatiblity
* that prevents communication.
*
* Minor protocol version. Different version indicates minor incompatibility
* that does not prevent interoperation.
*/
#define PROTOCOL_MAJOR_1 1
#define PROTOCOL_MINOR_1 5
/* We support both SSH1 and SSH2 */
#define PROTOCOL_MAJOR_2 2
#define PROTOCOL_MINOR_2 0
/*
* Name for the service. The port named by this service overrides the
* default port if present.
*/
#define SSH_SERVICE_NAME "ssh"
/*
* Name of the environment variable containing the pathname of the
* authentication socket.
*/
#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
/*
* Name of the environment variable containing the pathname of the
* authentication socket.
*/
#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
/*
* environment variable for overwriting the default ssh-askpass location
*/
#define SSH_ASKPASS_ENV "SSH_ASKPASS"
/*
* Force host key length and server key length to differ by at least this
* many bits. This is to make double encryption with rsaref work.
*/
#define SSH_KEY_BITS_RESERVED 128
/*
* Length of the session key in bytes. (Specified as 256 bits in the
* protocol.)
*/
#define SSH_SESSION_KEY_LENGTH 32
/* Name of Kerberos service for SSH to use. */
#define KRB4_SERVICE_NAME "rcmd"
/*
* Authentication methods. New types can be added, but old types should not
* be removed for compatibility. The maximum allowed value is 31.
*/
#define SSH_AUTH_RHOSTS 1
#define SSH_AUTH_RSA 2
#define SSH_AUTH_PASSWORD 3
#define SSH_AUTH_RHOSTS_RSA 4
#define SSH_AUTH_TIS 5
#define SSH_AUTH_KERBEROS 6
#define SSH_PASS_KERBEROS_TGT 7
/* 8 to 15 are reserved */
#define SSH_PASS_AFS_TOKEN 21
/* Protocol flags. These are bit masks. */
#define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
#define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
/*
* Definition of message types. New values can be added, but old values
* should not be removed or without careful consideration of the consequences
* for compatibility. The maximum value is 254; value 255 is reserved for
* future extension.
*/
/* Message name */ /* msg code */ /* arguments */
#define SSH_MSG_NONE 0 /* no message */
#define SSH_MSG_DISCONNECT 1 /* cause (string) */
#define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
#define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
#define SSH_CMSG_USER 4 /* user (string) */
#define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
#define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
#define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
#define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
#define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
#define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
#define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
#define SSH_CMSG_EXEC_SHELL 12 /* */
#define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
#define SSH_SMSG_SUCCESS 14 /* */
#define SSH_SMSG_FAILURE 15 /* */
#define SSH_CMSG_STDIN_DATA 16 /* data (string) */
#define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
#define SSH_SMSG_STDERR_DATA 18 /* data (string) */
#define SSH_CMSG_EOF 19 /* */
#define SSH_SMSG_EXITSTATUS 20 /* status (int) */
#define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
#define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
#define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
#define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
#define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
/* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
#define SSH_SMSG_X11_OPEN 27 /* channel (int) */
#define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
#define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
#define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
#define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
#define SSH_MSG_IGNORE 32 /* string */
#define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
#define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
#define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
#define SSH_MSG_DEBUG 36 /* string */
#define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
#define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k
(int) */
/*
* The protocol defines this message as support for the
* TIS authentication server. However, we currently use
* it for s/key challenge/response.
* XXX We should bring this up on secsh. --thorpej
*/
#define SSH_CMSG_AUTH_TIS 39 /* */
#define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */
#define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */
#define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
#define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
#define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
/* Reserved for official extensions. */
#define SSH_CMSG_RESERVED_START 45
#define SSH_CMSG_RESERVED_END 63
#define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
/*------------ definitions for login.c -------------*/
/*
* Returns the time when the user last logged in. Returns 0 if the
* information is not available. This must be called before record_login.
* The host from which the user logged in is stored in buf.
*/
unsigned long
get_last_login_time(uid_t uid, const char *logname,
char *buf, unsigned int bufsize);
/*
* Records that the user has logged in. This does many things normally done
* by login(1).
*/
void
record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
const char *host, struct sockaddr *addr);
/*
* Records that the user has logged out. This does many thigs normally done
* by login(1) or init.
*/
void record_logout(pid_t pid, const char *ttyname);
/*------------ definitions for sshconnect.c ----------*/
/*
* Opens a TCP/IP connection to the remote server on the given host. If port
* is 0, the default port will be used. If anonymous is zero, a privileged
* port will be allocated to make the connection. This requires super-user
* privileges if anonymous is false. Connection_attempts specifies the
* maximum number of tries, one per second. This returns true on success,
* and zero on failure. If the connection is successful, this calls
* packet_set_connection for the connection.
*/
int
ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
u_short port, int connection_attempts,
int anonymous, uid_t original_real_uid,
const char *proxy_command);
/*
* Starts a dialog with the server, and authenticates the current user on the
* server. This does not need any extra privileges. The basic connection to
* the server must already have been established before this is called. If
* login fails, this function prints an error and never returns. This
* initializes the random state, and leaves it initialized (it will also have
* references from the packet module).
*/
void
ssh_login(int host_key_valid, RSA * host_key, const char *host,
struct sockaddr * hostaddr, uid_t original_real_uid);
/*------------ Definitions for various authentication methods. -------*/
/*
* Tries to authenticate the user using the .rhosts file. Returns true if
* authentication succeeds. If ignore_rhosts is non-zero, this will not
* consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
*/
int auth_rhosts(struct passwd * pw, const char *client_user);
/*
* Tries to authenticate the user using the .rhosts file and the host using
* its host key. Returns true if authentication succeeds.
*/
int
auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key);
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int auth_password(struct passwd * pw, const char *password);
/*
* Performs the RSA authentication dialog with the client. This returns 0 if
* the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_rsa(struct passwd * pw, BIGNUM * client_n);
/*
* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
* over the key. Skips any whitespace at the beginning and at end.
*/
int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n);
/*
* Returns the name of the machine at the other end of the socket. The
* returned string should be freed by the caller.
*/
char *get_remote_hostname(int socket);
/*
* Return the canonical name of the host in the other side of the current
* connection (as returned by packet_get_connection). The host name is
* cached, so it is efficient to call this several times.
*/
const char *get_canonical_hostname(void);
/*
* Returns the remote IP address as an ascii string. The value need not be
* freed by the caller.
*/
const char *get_remote_ipaddr(void);
/* Returns the port number of the peer of the socket. */
int get_peer_port(int sock);
/* Returns the port number of the remote/local host. */
int get_remote_port(void);
int get_local_port(void);
/*
* Performs the RSA authentication challenge-response dialog with the client,
* and returns true (non-zero) if the client gave the correct answer to our
* challenge; returns zero if the client gives a wrong answer.
*/
int auth_rsa_challenge_dialog(RSA *pk);
/*
* Reads a passphrase from /dev/tty with echo turned off. Returns the
* passphrase (allocated with xmalloc). Exits if EOF is encountered. If
* from_stdin is true, the passphrase will be read from stdin instead.
*/
char *read_passphrase(const char *prompt, int from_stdin);
/*------------ Definitions for logging. -----------------------*/
/* Supported syslog facilities and levels. */
typedef enum {
SYSLOG_FACILITY_DAEMON,
SYSLOG_FACILITY_USER,
SYSLOG_FACILITY_AUTH,
SYSLOG_FACILITY_LOCAL0,
SYSLOG_FACILITY_LOCAL1,
SYSLOG_FACILITY_LOCAL2,
SYSLOG_FACILITY_LOCAL3,
SYSLOG_FACILITY_LOCAL4,
SYSLOG_FACILITY_LOCAL5,
SYSLOG_FACILITY_LOCAL6,
SYSLOG_FACILITY_LOCAL7
} SyslogFacility;
typedef enum {
SYSLOG_LEVEL_QUIET,
SYSLOG_LEVEL_FATAL,
SYSLOG_LEVEL_ERROR,
SYSLOG_LEVEL_INFO,
SYSLOG_LEVEL_VERBOSE,
SYSLOG_LEVEL_DEBUG1,
SYSLOG_LEVEL_DEBUG2,
SYSLOG_LEVEL_DEBUG3
} LogLevel;
/* Initializes logging. */
void log_init(const char *av0, LogLevel level, SyslogFacility facility,
int on_stderr, int quiet_mode, int debug_mode);
/* Logging implementation, depending on server or client */
void do_log(LogLevel level, const char *fmt, va_list args)
__attribute__((format(printf, 2, 0)));
/* name to facility/level */
SyslogFacility log_facility_number(const char *name);
LogLevel log_level_number(const char *name);
/* Output a message to syslog or stderr */
void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void error(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void log(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void debug(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void debug2(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void debug3(const char *fmt,...) __attribute__((format(printf, 1, 2)));
/* same as fatal() but w/o logging */
void fatal_cleanup(void);
/*
* Registers a cleanup function to be called by fatal()/fatal_cleanup()
* before exiting. It is permissible to call fatal_remove_cleanup for the
* function itself from the function.
*/
void fatal_add_cleanup(void (*proc) (void *context), void *context);
/* Removes a cleanup function to be called at fatal(). */
void fatal_remove_cleanup(void (*proc) (void *context), void *context);
/* ---- misc */
/*
* Expands tildes in the file name. Returns data allocated by xmalloc.
* Warning: this calls getpw*.
*/
char *tilde_expand_filename(const char *filename, uid_t my_uid);
/* remove newline at end of string */
char *chop(char *s);
/* return next token in configuration line */
char *strdelim(char **s);
/* set filedescriptor to non-blocking */
void set_nonblock(int fd);
/*
* Performs the interactive session. This handles data transmission between
* the client and the program. Note that the notion of stdin, stdout, and
* stderr in this function is sort of reversed: this function writes to stdin
* (of the child program), and reads from stdout and stderr (of the child
* program).
*/
void server_loop(pid_t pid, int fdin, int fdout, int fderr);
void server_loop2(void);
/* Client side main loop for the interactive session. */
int client_loop(int have_pty, int escape_char, int id);
/* Linked list of custom environment strings (see auth-rsa.c). */
struct envstring {
struct envstring *next;
char *s;
};
/*
* `Atomic' read and write operations, to ensure that all the
* data makes it through a socket (handles signals, etc.).
*/
ssize_t atomic_read(int, void *, size_t);
ssize_t atomic_write(int, const void *, size_t);
/*
* Misc. random functions.
*/
void ssh_random_stir(void);
#ifdef KRB4
#include <krb.h>
/*
* Performs Kerberos v4 mutual authentication with the client. This returns 0
* if the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_krb4(const char *server_user, KTEXT auth, char **client);
int krb4_init(uid_t uid);
void krb4_cleanup_proc(void *ignore);
int auth_krb4_password(struct passwd * pw, const char *password);
#ifdef AFS
#include <kafs.h>
/* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
int auth_kerberos_tgt(struct passwd * pw, const char *string);
int auth_afs_token(struct passwd * pw, const char *token_string);
int creds_to_radix(CREDENTIALS * creds, unsigned char *buf, size_t buflen);
int radix_to_creds(const char *buf, CREDENTIALS * creds);
#endif /* AFS */
#endif /* KRB4 */
#ifdef SKEY
#include <skey.h>
char *skey_fake_keyinfo(const char *username);
int auth_skey_password(struct passwd *pw, const char *password);
#endif /* SKEY */
/* AF_UNSPEC or AF_INET or AF_INET6 */
extern int IPv4or6;
#endif /* SSH_H */
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