xref: /freebsd/crypto/openssh/ssh.h (revision 74bf4e164ba5851606a27d4feff27717452583e5)
1 /*	$OpenBSD: ssh.h,v 1.75 2003/12/02 17:01:15 markus Exp $	*/
2 
3 /*
4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6  *                    All rights reserved
7  *
8  * As far as I am concerned, the code I have written for this software
9  * can be used freely for any purpose.  Any derived versions of this
10  * software must be clearly marked as such, and if the derived work is
11  * incompatible with the protocol description in the RFC file, it must be
12  * called by a name other than "ssh" or "Secure Shell".
13  */
14 
15 #ifndef SSH_H
16 #define SSH_H
17 
18 #include <netinet/in.h> /* For struct sockaddr_in */
19 #include <pwd.h> /* For struct pw */
20 #include <stdarg.h> /* For va_list */
21 #include <syslog.h> /* For LOG_AUTH and friends */
22 #include <sys/socket.h> /* For struct sockaddr_storage */
23 #ifdef HAVE_SYS_SELECT_H
24 # include <sys/select.h>
25 #endif
26 
27 /* Cipher used for encrypting authentication files. */
28 #define SSH_AUTHFILE_CIPHER	SSH_CIPHER_3DES
29 
30 /* Default port number. */
31 #define SSH_DEFAULT_PORT	22
32 
33 /* Maximum number of TCP/IP ports forwarded per direction. */
34 #define SSH_MAX_FORWARDS_PER_DIRECTION	100
35 
36 /*
37  * Maximum number of RSA authentication identity files that can be specified
38  * in configuration files or on the command line.
39  */
40 #define SSH_MAX_IDENTITY_FILES		100
41 
42 /*
43  * Major protocol version.  Different version indicates major incompatibility
44  * that prevents communication.
45  *
46  * Minor protocol version.  Different version indicates minor incompatibility
47  * that does not prevent interoperation.
48  */
49 #define PROTOCOL_MAJOR_1	1
50 #define PROTOCOL_MINOR_1	5
51 
52 /* We support both SSH1 and SSH2 */
53 #define PROTOCOL_MAJOR_2	2
54 #define PROTOCOL_MINOR_2	0
55 
56 /*
57  * Name for the service.  The port named by this service overrides the
58  * default port if present.
59  */
60 #define SSH_SERVICE_NAME	"ssh"
61 
62 /*
63  * Name of the environment variable containing the process ID of the
64  * authentication agent.
65  */
66 #define SSH_AGENTPID_ENV_NAME	"SSH_AGENT_PID"
67 
68 /*
69  * Name of the environment variable containing the pathname of the
70  * authentication socket.
71  */
72 #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
73 
74 /*
75  * Environment variable for overwriting the default location of askpass
76  */
77 #define SSH_ASKPASS_ENV		"SSH_ASKPASS"
78 
79 /*
80  * Force host key length and server key length to differ by at least this
81  * many bits.  This is to make double encryption with rsaref work.
82  */
83 #define SSH_KEY_BITS_RESERVED		128
84 
85 /*
86  * Length of the session key in bytes.  (Specified as 256 bits in the
87  * protocol.)
88  */
89 #define SSH_SESSION_KEY_LENGTH		32
90 
91 /* Used to identify ``EscapeChar none'' */
92 #define SSH_ESCAPECHAR_NONE		-2
93 
94 /*
95  * unprivileged user when UsePrivilegeSeparation=yes;
96  * sshd will change its privileges to this user and its
97  * primary group.
98  */
99 #ifndef SSH_PRIVSEP_USER
100 #define SSH_PRIVSEP_USER		"sshd"
101 #endif
102 
103 /* Minimum modulus size (n) for RSA keys. */
104 #define SSH_RSA_MINIMUM_MODULUS_SIZE	768
105 
106 /* Listen backlog for sshd, ssh-agent and forwarding sockets */
107 #define SSH_LISTEN_BACKLOG		128
108 
109 #endif				/* SSH_H */
110