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System Administration Guide: Security Services
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Keywords in Solaris Secure Shell

The following tables list the keywords and their default values, if any. The keywords are in alphabetical order. The location of keywords on the client is the ssh_config file. Keywords that apply to the server are in the sshd_config file. Some keywords are set in both files. If the keyword applies to only one protocol version, the version is listed.

Table 20-1 Keywords in Solaris Secure Shell Configuration Files (A to Escape)

Keyword

Default Value

Location

Protocol

AllowGroups

No default.

Server

AllowTcpForwarding

no

Server

AllowUsers

No default.

Server

AuthorizedKeysFile

~/.ssh/authorized_keys

Server

Banner

/etc/issue

Server

Batchmode

no

Client

BindAddress

No default.

Client

CheckHostIP

yes

Client

Cipher

blowfish, 3des

Client

v1

Ciphers

aes128-ctr, aes128-cbc, 3des-cbc, blowfish-cbc, arcfour

Both

v2

ClearAllForwardings

No default.

Client

ClientAliveInterval

0

Server

v2

ClientAliveCountMax

3

Server

v2

Compression

yes

Both

CompressionLevel

No default.

Client

ConnectionAttempts

1

Client

DenyGroups

No default.

Server

DenyUsers

No default.

Server

DynamicForward

No default.

Client

EscapeChar

~

Client

Table 20-2 Keywords in Solaris Secure Shell Configuration Files (Fall to Local)

Keyword

Default Value

Location

Protocol

FallBackToRsh

no

Client

ForwardAgent

no

Client

ForwardX11

no

Client

GatewayPorts

no

Both

GlobalKnownHostsFile

/etc/ssh/ssh_known_hosts

Client

GSSAPIAuthentication

yes

Both

v2

GSSAPIDelegateCredentials

no

Client

v2

GSSAPIKeyExchange

yes

Both

v2

GSSAPIStoreDelegateCredentials

no

Client

v2

Host

* For more information, see Host-Specific Parameters in Solaris Secure Shell.

Client

HostbasedAuthentication

no

Both

v2

HostbasedUsesNamesFromPacketOnly

no

Server

v2

HostKey

/etc/ssh/ssh_host_key

Server

v1

HostKey

/etc/ssh/host_rsa_key, /etc/ssh/host_dsa_key

Server

v2

HostKeyAlgorithms

ssh-rsa, ssh-dss

Client

v2

HostKeyAlias

No default.

Client

v2

IdentityFile

~/.ssh/identity

Client

v1

IdentityFile

~/.ssh/id_dsa, ~/.ssh/id_rsa

Client

v2

IgnoreRhosts

yes

Server

IgnoreUserKnownHosts

yes

Server

KbdInteractiveAuthentication

yes

Both

KeepAlive

yes

Both

KeyRegenerationInterval

3600 (seconds)

Server

ListenAddress

No default.

Server

LocalForward

No default.

Client

Table 20-3 Keywords in Solaris Secure Shell Configuration Files (Login to R)

Keyword

Default Value

Location

Protocol

LoginGraceTime

600 (seconds)

Server

LogLevel

info

Both

LookupClientHostname

yes

Server

MACs

hmac-sha1,hmac-md5

Both

v2

MaxAuthTries

6

Server

MaxAuthTriesLog

No default.

Server

MaxStartups

10:30:60

Server

NoHostAuthenticationForLocalHost

no

Client

NumberOfPasswordPrompts

3

Client

PAMAuthenticationViaKBDInt

yes

Server

v2

PasswordAuthentication

yes

Both

PermitEmptyPasswords

no

Server

PermitRootLogin

no

Server

PermitUserEnvironment

no

Server

PreferredAuthentications

gssapi-keyex, gssapi-with-mic, hostbased, publickey, keyboard-interactive, password

Client

v2

Port

22

Both

PrintMotd

no

Server

Protocol

2

Both

ProxyCommand

No default.

Client

PubkeyAuthentication

yes

Both

v2

RemoteForward

No default.

Client

RhostsAuthentication

no

Both

v1

RhostsRSAAuthentication

no

Both

v1

RSAAuthentication

no

Both

v1

Table 20-4 Keywords in Solaris Secure Shell Configuration Files (S to X)

Keyword

Default Value

Location

Protocol

ServerKeyBits

768

Server

StrictHostKeyChecking

ask

Client

StrictModes

yes

Server

Subsystem

sftp /usr/lib/ssh/sftp-server

Server

SyslogFacility

auth

Server

UseLogin

no Deprecated and ignored.

Server

User

No default.

Client

UserKnownHostsFile

~/.ssh/known_hosts

Client

VerifyReverseMapping

no

Server

X11Forwarding

yes

Server

X11DisplayOffset

10

Server

X11UseLocalHost

yes

Server

XAuthLocation

No default.

Both

Host-Specific Parameters in Solaris Secure Shell

If it is useful to have different Solaris Secure Shell characteristics for different local hosts, the administrator can define separate sets of parameters in the /etc/ssh/ssh_config file to be applied according to host or regular expression. This task is done by grouping entries in the file by Host keyword. If the Host keyword is not used, the entries in the client configuration file apply to whichever local host a user is working on.

Solaris Secure Shell and Login Environment Variables

When the following Solaris Secure Shell keywords are not set in the sshd_config file, they get their value from equivalent entries in the /etc/default/login file:

Entry in /etc/default/login

Keyword and Value in sshd_config

CONSOLE=*

PermitRootLogin=without-password

#CONSOLE=*

PermitRootLogin=yes

PASSREQ=YES

PermitEmptyPasswords=no

PASSREQ=NO

PermitEmptyPasswords=yes

#PASSREQ

PermitEmptyPasswords=no

TIMEOUT=secs

LoginGraceTime=secs

#TIMEOUT

LoginGraceTime=300

RETRIES and SYSLOG_FAILED_LOGINS

Apply only to password and keyboard-interactive authentication methods.

When the following variables are set by the login command, the sshd daemon uses those values. When the variables are not set, the daemon uses the default value.

TIMEZONE

Controls the setting of the TZ environment variable. When not set, the sshd daemon uses value of TZ when the daemon was started.

ALTSHELL

Controls the setting of the SHELL environment variable. The default is ALTSHELL=YES, where the sshd daemon uses the value of the user's shell. When ALTSHELL=NO, the SHELL value is not set.

PATH

Controls the setting of the PATH environment variable. When the value is not set, the default path is /usr/bin.

SUPATH

Controls the setting of the PATH environment variable for root. When the value is not set, the default path is /usr/sbin:/usr/bin.

For more information, see the login(1) and sshd(1M) man pages.

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