-/*
-
-ssh.h
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Fri Mar 17 17:09:37 1995 ylo
-
-Generic header file for ssh.
-
-*/
-
-/* RCSID("$Id$"); */
+/* $OpenBSD: ssh.h,v 1.78 2006/08/03 03:34:42 deraadt Exp $ */
-#ifndef SSH_H
-#define SSH_H
-
-#include "rsa.h"
-#include "cipher.h"
-
-/* 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
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * 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".
+ */
/* Cipher used for encrypting authentication files. */
#define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
/* 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. */
+/*
+ * 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. */
-#define PROTOCOL_MAJOR 1
+/*
+ * Maximum length of lines in authorized_keys file.
+ * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
+ * some room for options and comments.
+ */
+#define SSH_MAX_PUBKEY_BYTES 8192
-/* Minor protocol version. Different version indicates minor incompatibility
- that does not prevent interoperation. */
-#define PROTOCOL_MINOR 5
+/*
+ * Major protocol version. Different version indicates major incompatibility
+ * 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. */
+/*
+ * Name for the service. The port named by this service overrides the
+ * default port if present.
+ */
#define SSH_SERVICE_NAME "ssh"
-#ifndef ETCDIR
-#define ETCDIR "/etc"
-#endif /* ETCDIR */
-
-#define PIDDIR "/var/run"
-
-/* System-wide file containing host keys of known hosts. This file should be
- world-readable. */
-#define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
-
-/* HOST_KEY_FILE /etc/ssh_host_key,
- SERVER_CONFIG_FILE /etc/sshd_config,
-and HOST_CONFIG_FILE /etc/ssh_config
-are all defined in Makefile.in. Of these, ssh_host_key should be readable
-only by root, whereas ssh_config should be world-readable. */
-
-#define HOST_KEY_FILE ETCDIR "/ssh_host_key"
-#define SERVER_CONFIG_FILE ETCDIR "/sshd_config"
-#define HOST_CONFIG_FILE ETCDIR "/ssh_config"
-
-#define SSH_PROGRAM "/usr/bin/ssh"
-
-/* The process id of the daemon listening for connections is saved
- here to make it easier to kill the correct daemon when necessary. */
-#define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
-
-/* The directory in user\'s home directory in which the files reside.
- The directory should be world-readable (though not all files are). */
-#define SSH_USER_DIR ".ssh"
-
-/* Per-user file containing host keys of known hosts. This file need
- not be readable by anyone except the user him/herself, though this does
- not contain anything particularly secret. */
-#define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
-
-/* Name of the default file containing client-side authentication key.
- This file should only be readable by the user him/herself. */
-#define SSH_CLIENT_IDENTITY ".ssh/identity"
-
-/* Configuration file in user\'s home directory. This file need not be
- readable by anyone but the user him/herself, but does not contain
- anything particularly secret. If the user\'s home directory resides
- on an NFS volume where root is mapped to nobody, this may need to be
- world-readable. */
-#define SSH_USER_CONFFILE ".ssh/config"
-
-/* File containing a list of those rsa keys that permit logging in as
- this user. This file need not be
- readable by anyone but the user him/herself, but does not contain
- anything particularly secret. If the user\'s home directory resides
- on an NFS volume where root is mapped to nobody, this may need to be
- world-readable. (This file is read by the daemon which is running as
- root.) */
-#define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
-
-/* Per-user and system-wide ssh "rc" files. These files are executed with
- /bin/sh before starting the shell or command if they exist. They
- will be passed "proto cookie" as arguments if X11 forwarding with
- spoofing is in use. xauth will be run if neither of these exists. */
-#define SSH_USER_RC ".ssh/rc"
-#define SSH_SYSTEM_RC ETCDIR "/sshrc"
-
-/* Ssh-only version of /etc/hosts.equiv. */
-#define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
+/*
+ * Name of the environment variable containing the process ID of the
+ * authentication agent.
+ */
+#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
-/* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if
- rhosts authentication is enabled. */
+/*
+ * 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_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
+/*
+ * Environment variable for overwriting the default location of askpass
+ */
+#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. */
+/*
+ * 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.) */
+/*
+ * 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
- /* 5 is TIS */
-#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) */
-#define SSH_CMSG_AUTH_TIS 39 /* this is proto-1.5, but we ignore TIS */
-#define SSH_SMSG_AUTH_TIS_CHALLENGE 40
-#define SSH_CMSG_AUTH_TIS_RESPONSE 41
-
-#define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
-#define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
-#define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */
-#define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
-
-
-/* Includes that need definitions above. */
-
-#include "readconf.h"
-
-/*------------ 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(int pid, const char *ttyname, const char *user, uid_t uid,
- const char *host, struct sockaddr_in *addr);
-
-/* Records that the user has logged out. This does many thigs normally
- done by login(1) or init. */
-void record_logout(int 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_in *hostaddr,
- int 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_in *hostaddr, Options *options,
- 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).
- If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */
-int auth_rhosts(struct passwd *pw, const char *client_user,
- int ignore_rhosts, int strict_modes);
-
-/* 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,
- unsigned int bits, BIGNUM *client_host_key_e,
- BIGNUM *client_host_key_n, int ignore_rhosts,
- int strict_modes);
-
-/* 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, int strict_modes);
-
-/* 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 host. */
-int get_remote_port(void);
-
-/* Tries to match the host name (which must be in all lowercase) against the
- comma-separated sequence of subpatterns (each possibly preceded by ! to
- indicate negation). Returns true if there is a positive match; zero
- otherwise. */
-int match_hostname(const char *host, const char *pattern, unsigned int len);
-
-/* Checks whether the given host is already in the list of our known hosts.
- Returns HOST_OK if the host is known and has the specified key,
- HOST_NEW if the host is not known, and HOST_CHANGED if the host is known
- but used to have a different host key. The host must be in all lowercase. */
-typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus;
-HostStatus check_host_in_hostfile(const char *filename,
- const char *host, unsigned int bits,
- BIGNUM *e, BIGNUM *n,
- BIGNUM *ke, BIGNUM *kn);
-
-/* Appends an entry to the host file. Returns false if the entry
- could not be appended. */
-int add_host_to_hostfile(const char *filename, const char *host,
- unsigned int bits, BIGNUM *e, BIGNUM *n);
+/* Used to identify ``EscapeChar none'' */
+#define SSH_ESCAPECHAR_NONE -2
-/* 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(unsigned int bits, BIGNUM *e, BIGNUM *n);
-
-/* 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);
-
-/* Saves the authentication (private) key in a file, encrypting it with
- passphrase. The identification of the file (lowest 64 bits of n)
- will precede the key to provide identification of the key without
- needing a passphrase. */
-int save_private_key(const char *filename, const char *passphrase,
- RSA *private_key, const char *comment);
-
-/* Loads the public part of the key file (public key and comment).
- Returns 0 if an error occurred; zero if the public key was successfully
- read. The comment of the key is returned in comment_return if it is
- non-NULL; the caller must free the value with xfree. */
-int load_public_key(const char *filename, RSA *pub,
- char **comment_return);
-
-/* Loads the private key from the file. Returns 0 if an error is encountered
- (file does not exist or is not readable, or passphrase is bad).
- This initializes the private key. The comment of the key is returned
- in comment_return if it is non-NULL; the caller must free the value
- with xfree. */
-int load_private_key(const char *filename, const char *passphrase,
- RSA *private_key, char **comment_return);
-
-/*------------ Definitions for logging. -----------------------*/
-
-/* Supported syslog facilities. */
-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;
-
-/* Initializes logging. If debug is non-zero, debug() will output something.
- If quiet is non-zero, none of these will log send anything to syslog
- (but maybe to stderr). */
-void log_init(char *av0, int on_stderr, int debug, int quiet,
- SyslogFacility facility);
-
-/* Outputs a message to syslog or stderr, depending on the implementation.
- The format must guarantee that the final message does not exceed 1024
- characters. The message should not contain newline. */
-void log(const char *fmt, ...);
-
-/* Outputs a message to syslog or stderr, depending on the implementation.
- The format must guarantee that the final message does not exceed 1024
- characters. The message should not contain newline. */
-void debug(const char *fmt, ...);
-
-/* Outputs a message to syslog or stderr, depending on the implementation.
- The format must guarantee that the final message does not exceed 1024
- characters. The message should not contain newline. */
-void error(const char *fmt, ...);
-
-/* Outputs a message to syslog or stderr, depending on the implementation.
- The format must guarantee that the final message does not exceed 1024
- characters. The message should not contain newline.
- This call never returns. */
-void fatal(const char *fmt, ...);
-
-/* Registers a cleanup function to be called by fatal() 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 frunction to be called at fatal(). */
-void fatal_remove_cleanup(void (*proc)(void *context), void *context);
-
-/*---------------- definitions for channels ------------------*/
-
-/* Sets specific protocol options. */
-void channel_set_options(int hostname_in_open);
-
-/* Allocate a new channel object and set its type and socket. Remote_name
- must have been allocated with xmalloc; this will free it when the channel
- is freed. */
-int channel_allocate(int type, int sock, char *remote_name);
-
-/* Free the channel and close its socket. */
-void channel_free(int channel);
-
-/* Add any bits relevant to channels in select bitmasks. */
-void channel_prepare_select(fd_set *readset, fd_set *writeset);
-
-/* After select, perform any appropriate operations for channels which
- have events pending. */
-void channel_after_select(fd_set *readset, fd_set *writeset);
-
-/* If there is data to send to the connection, send some of it now. */
-void channel_output_poll(void);
-
-/* This is called when a packet of type CHANNEL_DATA has just been received.
- The message type has already been consumed, but channel number and data
- is still there. */
-void channel_input_data(int payload_len);
-
-/* Returns true if no channel has too much buffered data. */
-int channel_not_very_much_buffered_data(void);
-
-/* This is called after receiving CHANNEL_CLOSE. */
-void channel_input_close(void);
-
-/* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */
-void channel_input_close_confirmation(void);
-
-/* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */
-void channel_input_open_confirmation(void);
-
-/* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */
-void channel_input_open_failure(void);
-
-/* This closes any sockets that are listening for connections; this removes
- any unix domain sockets. */
-void channel_stop_listening(void);
-
-/* Closes the sockets of all channels. This is used to close extra file
- descriptors after a fork. */
-void channel_close_all(void);
-
-/* Returns the maximum file descriptor number used by the channels. */
-int channel_max_fd(void);
-
-/* Returns true if there is still an open channel over the connection. */
-int channel_still_open(void);
-
-/* Returns a string containing a list of all open channels. The list is
- suitable for displaying to the user. It uses crlf instead of newlines.
- The caller should free the string with xfree. */
-char *channel_open_message(void);
-
-/* Initiate forwarding of connections to local port "port" through the secure
- channel to host:port from remote side. This never returns if there
- was an error. */
-void channel_request_local_forwarding(int port, const char *host,
- int remote_port);
-
-/* Initiate forwarding of connections to port "port" on remote host through
- the secure channel to host:port from local side. This never returns
- if there was an error. This registers that open requests for that
- port are permitted. */
-void channel_request_remote_forwarding(int port, const char *host,
- int remote_port);
-
-/* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
- called by the server, because the user could connect to any port anyway,
- and the server has no way to know but to trust the client anyway. */
-void channel_permit_all_opens(void);
-
-/* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
- listening for the port, and sends back a success reply (or disconnect
- message if there was an error). This never returns if there was an
- error. */
-void channel_input_port_forward_request(int is_root);
-
-/* This is called after receiving PORT_OPEN message. This attempts to connect
- to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or
- CHANNEL_OPEN_FAILURE. */
-void channel_input_port_open(int payload_len);
-
-/* Creates a port for X11 connections, and starts listening for it.
- Returns the display name, or NULL if an error was encountered. */
-char *x11_create_display(int screen);
-
-/* Creates an internet domain socket for listening for X11 connections.
- Returns a suitable value for the DISPLAY variable, or NULL if an error
- occurs. */
-char *x11_create_display_inet(int screen);
-
-/* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
- the remote channel number. We should do whatever we want, and respond
- with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */
-void x11_input_open(int payload_len);
-
-/* Requests forwarding of X11 connections. This should be called on the
- client only. */
-void x11_request_forwarding(void);
-
-/* Requests forwarding for X11 connections, with authentication spoofing.
- This should be called in the client only. */
-void x11_request_forwarding_with_spoofing(const char *proto, const char *data);
-
-/* Local Xauthority file (server only). */
-extern char *xauthfile;
-
-/* Sends a message to the server to request authentication fd forwarding. */
-void auth_request_forwarding(void);
-
-/* Returns the name of the forwarded authentication socket. Returns NULL
- if there is no forwarded authentication socket. The returned value points
- to a static buffer. */
-char *auth_get_socket_name(void);
-
-/* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
- This starts forwarding authentication requests. */
-void auth_input_request_forwarding(struct passwd *pw);
-
-/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
-void auth_input_open_request(void);
-
-/* Returns true if the given string matches the pattern (which may contain
- ? and * as wildcards), and zero if it does not match. */
-int match_pattern(const char *s, const char *pattern);
-
-/* 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);
-
-/* 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(int pid, int fdin, int fdout, int fderr);
-
-/* Client side main loop for the interactive session. */
-int client_loop(int have_pty, int escape_char);
-
-/* Linked list of custom environment strings (see auth-rsa.c). */
-struct envstring {
- struct envstring *next;
- char *s;
-};
-
-#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 ssh_tf_init(uid_t uid);
-
-#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(char *server_user, uid_t uid, const char *string);
-
-int creds_to_radix(CREDENTIALS *creds, unsigned char *buf);
-int radix_to_creds(const char *buf, CREDENTIALS *creds);
-#endif /* AFS */
-
-#endif /* KRB4 */
-
-#ifdef SKEY
-#include <skey.h>
-char *skey_fake_keyinfo(char *username);
-#endif /* SKEY */
-
-#endif /* SSH_H */
+/*
+ * unprivileged user when UsePrivilegeSeparation=yes;
+ * sshd will change its privileges to this user and its
+ * primary group.
+ */
+#ifndef SSH_PRIVSEP_USER
+#define SSH_PRIVSEP_USER "sshd"
+#endif
+
+/* Minimum modulus size (n) for RSA keys. */
+#define SSH_RSA_MINIMUM_MODULUS_SIZE 768
+
+/* Listen backlog for sshd, ssh-agent and forwarding sockets */
+#define SSH_LISTEN_BACKLOG 128
andersk / openssh.git / blobdiff