536 lines
18 KiB
C
536 lines
18 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* Generic header file for ssh.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/* RCSID("$OpenBSD: ssh.h,v 1.54 2000/10/11 20:27:24 markus Exp $"); */
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/* $FreeBSD$ */
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#ifndef SSH_H
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#define SSH_H
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#include "rsa.h"
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#include "cipher.h"
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/* Cipher used for encrypting authentication files. */
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#define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
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/* Default port number. */
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#define SSH_DEFAULT_PORT 22
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/* Maximum number of TCP/IP ports forwarded per direction. */
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#define SSH_MAX_FORWARDS_PER_DIRECTION 100
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/*
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* Maximum number of RSA authentication identity files that can be specified
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* in configuration files or on the command line.
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*/
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#define SSH_MAX_IDENTITY_FILES 100
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/*
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* Major protocol version. Different version indicates major incompatiblity
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* that prevents communication.
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*
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* Minor protocol version. Different version indicates minor incompatibility
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* that does not prevent interoperation.
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*/
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#define PROTOCOL_MAJOR_1 1
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#define PROTOCOL_MINOR_1 5
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/* We support both SSH1 and SSH2 */
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#define PROTOCOL_MAJOR_2 2
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#define PROTOCOL_MINOR_2 0
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/*
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* Name for the service. The port named by this service overrides the
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* default port if present.
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*/
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#define SSH_SERVICE_NAME "ssh"
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#define ETCDIR "/etc/ssh"
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#define PIDDIR "/var/run"
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/*
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* System-wide file containing host keys of known hosts. This file should be
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* world-readable.
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*/
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#define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts"
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#define SSH_SYSTEM_HOSTFILE2 ETCDIR "/ssh_known_hosts2"
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/*
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* Of these, ssh_host_key must be readable only by root, whereas ssh_config
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* should be world-readable.
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*/
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#define HOST_KEY_FILE ETCDIR "/ssh_host_key"
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#define SERVER_CONFIG_FILE ETCDIR "/sshd_config"
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#define HOST_CONFIG_FILE ETCDIR "/ssh_config"
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#define HOST_DSA_KEY_FILE ETCDIR "/ssh_host_dsa_key"
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#define DH_PRIMES ETCDIR "/primes"
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#define SSH_PROGRAM "/usr/bin/ssh"
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/*
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* The process id of the daemon listening for connections is saved here to
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* make it easier to kill the correct daemon when necessary.
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*/
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#define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid"
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/*
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* The directory in user\'s home directory in which the files reside. The
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* directory should be world-readable (though not all files are).
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*/
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#define SSH_USER_DIR ".ssh"
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/*
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* Per-user file containing host keys of known hosts. This file need not be
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* readable by anyone except the user him/herself, though this does not
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* contain anything particularly secret.
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*/
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#define SSH_USER_HOSTFILE "~/.ssh/known_hosts"
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#define SSH_USER_HOSTFILE2 "~/.ssh/known_hosts2"
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/*
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* Name of the default file containing client-side authentication key. This
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* file should only be readable by the user him/herself.
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*/
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#define SSH_CLIENT_IDENTITY ".ssh/identity"
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#define SSH_CLIENT_ID_DSA ".ssh/id_dsa"
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/*
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* Configuration file in user\'s home directory. This file need not be
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* readable by anyone but the user him/herself, but does not contain anything
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* particularly secret. If the user\'s home directory resides on an NFS
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* volume where root is mapped to nobody, this may need to be world-readable.
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*/
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#define SSH_USER_CONFFILE ".ssh/config"
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/*
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* File containing a list of those rsa keys that permit logging in as this
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* user. This file need not be readable by anyone but the user him/herself,
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* but does not contain anything particularly secret. If the user\'s home
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* directory resides on an NFS volume where root is mapped to nobody, this
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* may need to be world-readable. (This file is read by the daemon which is
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* running as root.)
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*/
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#define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys"
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#define SSH_USER_PERMITTED_KEYS2 ".ssh/authorized_keys2"
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/*
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* Per-user and system-wide ssh "rc" files. These files are executed with
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* /bin/sh before starting the shell or command if they exist. They will be
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* passed "proto cookie" as arguments if X11 forwarding with spoofing is in
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* use. xauth will be run if neither of these exists.
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*/
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#define SSH_USER_RC ".ssh/rc"
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#define SSH_SYSTEM_RC ETCDIR "/sshrc"
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/*
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* Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use
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* ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled.
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*/
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#define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv"
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/*
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* Name of the environment variable containing the pathname of the
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* authentication socket.
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*/
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#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
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/*
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* Name of the environment variable containing the pathname of the
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* authentication socket.
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*/
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#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
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/*
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* Default path to ssh-askpass used by ssh-add,
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* environment variable for overwriting the default location
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*/
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#define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass"
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#define SSH_ASKPASS_ENV "SSH_ASKPASS"
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/*
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* Force host key length and server key length to differ by at least this
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* many bits. This is to make double encryption with rsaref work.
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*/
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#define SSH_KEY_BITS_RESERVED 128
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/*
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* Length of the session key in bytes. (Specified as 256 bits in the
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* protocol.)
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*/
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#define SSH_SESSION_KEY_LENGTH 32
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/* Name of Kerberos service for SSH to use. */
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#define KRB4_SERVICE_NAME "rcmd"
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/*
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* Authentication methods. New types can be added, but old types should not
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* be removed for compatibility. The maximum allowed value is 31.
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*/
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#define SSH_AUTH_RHOSTS 1
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#define SSH_AUTH_RSA 2
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#define SSH_AUTH_PASSWORD 3
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#define SSH_AUTH_RHOSTS_RSA 4
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#define SSH_AUTH_TIS 5
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#define SSH_AUTH_KERBEROS 6
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#define SSH_PASS_KERBEROS_TGT 7
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/* 8 to 15 are reserved */
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#define SSH_PASS_AFS_TOKEN 21
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/* Protocol flags. These are bit masks. */
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#define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */
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#define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */
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/*
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* Definition of message types. New values can be added, but old values
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* should not be removed or without careful consideration of the consequences
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* for compatibility. The maximum value is 254; value 255 is reserved for
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* future extension.
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*/
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/* Message name */ /* msg code */ /* arguments */
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#define SSH_MSG_NONE 0 /* no message */
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#define SSH_MSG_DISCONNECT 1 /* cause (string) */
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#define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */
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#define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */
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#define SSH_CMSG_USER 4 /* user (string) */
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#define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */
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#define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */
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#define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */
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#define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */
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#define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */
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#define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */
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#define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */
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#define SSH_CMSG_EXEC_SHELL 12 /* */
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#define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */
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#define SSH_SMSG_SUCCESS 14 /* */
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#define SSH_SMSG_FAILURE 15 /* */
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#define SSH_CMSG_STDIN_DATA 16 /* data (string) */
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#define SSH_SMSG_STDOUT_DATA 17 /* data (string) */
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#define SSH_SMSG_STDERR_DATA 18 /* data (string) */
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#define SSH_CMSG_EOF 19 /* */
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#define SSH_SMSG_EXITSTATUS 20 /* status (int) */
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#define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */
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#define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */
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#define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */
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#define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */
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#define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */
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/* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */
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#define SSH_SMSG_X11_OPEN 27 /* channel (int) */
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#define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */
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#define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */
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#define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */
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#define SSH_SMSG_AGENT_OPEN 31 /* port (int) */
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#define SSH_MSG_IGNORE 32 /* string */
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#define SSH_CMSG_EXIT_CONFIRMATION 33 /* */
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#define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */
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#define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */
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#define SSH_MSG_DEBUG 36 /* string */
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#define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */
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#define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */
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#define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */
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#define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */
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#define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */
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#define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */
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#define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */
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#define SSH_CMSG_HAVE_KERBEROS_TGT 44
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#define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */
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/* Kerberos IV tickets can't be forwarded. This is an AFS hack! */
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#define SSH_CMSG_HAVE_KRB4_TGT SSH_CMSG_HAVE_KERBEROS_TGT /* credentials (s) */
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/*------------ definitions for login.c -------------*/
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/*
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* Returns the time when the user last logged in. Returns 0 if the
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* information is not available. This must be called before record_login.
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* The host from which the user logged in is stored in buf.
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*/
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unsigned long
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get_last_login_time(uid_t uid, const char *logname,
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char *buf, unsigned int bufsize);
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/*
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* Records that the user has logged in. This does many things normally done
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* by login(1).
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*/
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void
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record_login(pid_t pid, const char *ttyname, const char *user, uid_t uid,
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const char *host, struct sockaddr *addr);
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/*
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* Records that the user has logged out. This does many thigs normally done
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* by login(1) or init.
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*/
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void record_logout(pid_t pid, const char *ttyname);
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/*------------ definitions for sshconnect.c ----------*/
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/*
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* Opens a TCP/IP connection to the remote server on the given host. If port
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* is 0, the default port will be used. If anonymous is zero, a privileged
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* port will be allocated to make the connection. This requires super-user
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* privileges if anonymous is false. Connection_attempts specifies the
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* maximum number of tries, one per second. This returns true on success,
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* and zero on failure. If the connection is successful, this calls
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* packet_set_connection for the connection.
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*/
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int
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ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
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u_short port, int connection_attempts,
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int anonymous, uid_t original_real_uid,
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const char *proxy_command);
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/*
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* Starts a dialog with the server, and authenticates the current user on the
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* server. This does not need any extra privileges. The basic connection to
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* the server must already have been established before this is called. If
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* login fails, this function prints an error and never returns. This
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* initializes the random state, and leaves it initialized (it will also have
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* references from the packet module).
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*/
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void
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ssh_login(int host_key_valid, RSA * host_key, const char *host,
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struct sockaddr * hostaddr, uid_t original_real_uid);
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/*------------ Definitions for various authentication methods. -------*/
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/*
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* Tries to authenticate the user using the .rhosts file. Returns true if
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* authentication succeeds. If ignore_rhosts is non-zero, this will not
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* consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
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*/
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int auth_rhosts(struct passwd * pw, const char *client_user);
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/*
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* Tries to authenticate the user using the .rhosts file and the host using
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* its host key. Returns true if authentication succeeds.
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*/
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int
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auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key);
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/*
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* Tries to authenticate the user using password. Returns true if
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* authentication succeeds.
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*/
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int auth_password(struct passwd * pw, const char *password);
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/*
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* Performs the RSA authentication dialog with the client. This returns 0 if
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* the client could not be authenticated, and 1 if authentication was
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* successful. This may exit if there is a serious protocol violation.
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*/
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int auth_rsa(struct passwd * pw, BIGNUM * client_n);
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/*
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* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
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* over the key. Skips any whitespace at the beginning and at end.
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*/
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int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n);
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/*
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* Returns the name of the machine at the other end of the socket. The
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* returned string should be freed by the caller.
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*/
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char *get_remote_hostname(int socket);
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/*
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* Return the canonical name of the host in the other side of the current
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* connection (as returned by packet_get_connection). The host name is
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* cached, so it is efficient to call this several times.
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*/
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const char *get_canonical_hostname(void);
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/*
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* Returns the local IP address as an ascii string.
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*/
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const char *get_ipaddr(int socket);
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/*
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* Returns the remote IP address as an ascii string. The value need not be
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* freed by the caller.
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*/
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const char *get_remote_ipaddr(void);
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/* Returns the port number of the peer of the socket. */
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int get_peer_port(int sock);
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/* Returns the port number of the remote/local host. */
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int get_remote_port(void);
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int get_local_port(void);
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/*
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* Performs the RSA authentication challenge-response dialog with the client,
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* and returns true (non-zero) if the client gave the correct answer to our
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* challenge; returns zero if the client gives a wrong answer.
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*/
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int auth_rsa_challenge_dialog(RSA *pk);
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/*
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* Reads a passphrase from /dev/tty with echo turned off. Returns the
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* passphrase (allocated with xmalloc). Exits if EOF is encountered. If
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* from_stdin is true, the passphrase will be read from stdin instead.
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*/
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char *read_passphrase(char *prompt, int from_stdin);
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/*------------ Definitions for logging. -----------------------*/
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/* Supported syslog facilities and levels. */
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typedef enum {
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SYSLOG_FACILITY_DAEMON,
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SYSLOG_FACILITY_USER,
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SYSLOG_FACILITY_AUTH,
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SYSLOG_FACILITY_LOCAL0,
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SYSLOG_FACILITY_LOCAL1,
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SYSLOG_FACILITY_LOCAL2,
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SYSLOG_FACILITY_LOCAL3,
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SYSLOG_FACILITY_LOCAL4,
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SYSLOG_FACILITY_LOCAL5,
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SYSLOG_FACILITY_LOCAL6,
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SYSLOG_FACILITY_LOCAL7
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} SyslogFacility;
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typedef enum {
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SYSLOG_LEVEL_QUIET,
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SYSLOG_LEVEL_FATAL,
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SYSLOG_LEVEL_ERROR,
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SYSLOG_LEVEL_INFO,
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SYSLOG_LEVEL_VERBOSE,
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SYSLOG_LEVEL_DEBUG1,
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SYSLOG_LEVEL_DEBUG2,
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SYSLOG_LEVEL_DEBUG3
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} LogLevel;
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/* Initializes logging. */
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void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr);
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/* Logging implementation, depending on server or client */
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void do_log(LogLevel level, const char *fmt, va_list args);
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/* name to facility/level */
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SyslogFacility log_facility_number(char *name);
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LogLevel log_level_number(char *name);
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/* Output a message to syslog or stderr */
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void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void error(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void log(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void debug(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void debug2(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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void debug3(const char *fmt,...) __attribute__((format(printf, 1, 2)));
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/* same as fatal() but w/o logging */
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void fatal_cleanup(void);
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/*
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* Registers a cleanup function to be called by fatal()/fatal_cleanup()
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* before exiting. It is permissible to call fatal_remove_cleanup for the
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* function itself from the function.
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*/
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void fatal_add_cleanup(void (*proc) (void *context), void *context);
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/* Removes a cleanup function to be called at fatal(). */
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void fatal_remove_cleanup(void (*proc) (void *context), void *context);
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/* ---- misc */
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/*
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* Expands tildes in the file name. Returns data allocated by xmalloc.
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* Warning: this calls getpw*.
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*/
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char *tilde_expand_filename(const char *filename, uid_t my_uid);
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/* remove newline at end of string */
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char *chop(char *s);
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/* return next token in configuration line */
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char *strdelim(char **s);
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/* set filedescriptor to non-blocking */
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void set_nonblock(int fd);
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/*
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* Performs the interactive session. This handles data transmission between
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* the client and the program. Note that the notion of stdin, stdout, and
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* stderr in this function is sort of reversed: this function writes to stdin
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* (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;
|
|
};
|
|
|
|
/*
|
|
* Ensure all of data on socket comes through. f==read || f==write
|
|
*/
|
|
ssize_t atomicio(ssize_t (*f)(), int fd, void *s, size_t n);
|
|
|
|
#ifdef KRB5
|
|
#include <krb5.h>
|
|
int auth_krb5(); /* XXX Doplnit prototypy */
|
|
int auth_krb5_tgt();
|
|
int krb5_init();
|
|
void krb5_cleanup_proc(void *ignore);
|
|
int auth_krb5_password(struct passwd *pw, const char *password);
|
|
#endif /* KRB5 */
|
|
|
|
#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_krb4_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 <opie.h>
|
|
char *skey_fake_keyinfo(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;
|
|
|
|
#ifdef USE_PAM
|
|
#include "auth-pam.h"
|
|
#endif /* USE_PAM */
|
|
|
|
#endif /* SSH_H */
|