151 lines
6.7 KiB
Go
151 lines
6.7 KiB
Go
/*
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SSHSecure - a program to harden OpenSSH from defaults
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Copyright (C) 2020 Brent Saner
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package config
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/*
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NOTATION KEY:
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.: Exists in default upstream config (but usually they're commented out)
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+: These values are/may be modified by this program.
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*: These values are not in the upstream config but are allowed via the man page (sshd_config(5) and ssh_config(5)).
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*/
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// More or less a subset of SshdConf. These are valid keywords for Match blocks in sshd_config.
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type SshdMatchRule struct {
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AcceptEnv []string // *
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AllowAgentForwarding sshBool // .
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AllowGroups []string // *
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AllowStreamLocalForwarding string // *
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AllowTcpForwarding string // .
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AllowUsers []string // *
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AuthenticationMethods []string // +*
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AuthorizedKeysCommand string // .
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AuthorizedKeysCommandUser string // .
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AuthorizedKeysFile string // .
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AuthorizedPrincipalsCommand string // *
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AuthorizedPrincipalsCommandUser string // *
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AuthorizedPrincipalsFile string // .
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Banner string // .
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ChrootDirectory string // .
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ClientAliveCountMax int // .
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ClientAliveInterval int // .
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DenyGroups []string // *
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DenyUsers []string // *
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ForceCommand string // *
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GatewayPorts string // .
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GSSAPIAuthentication sshBool // .
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HostbasedAcceptedKeyTypes []string // *
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HostbasedAuthentication sshBool // .
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HostbasedUsesNameFromPacketOnly sshBool // *
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IgnoreRhosts string // .
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// Do we handle includes? Or just let sshd -T handle it?
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Include string // *
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// Accepts one or two. If two, first is interactive and second is non-interactive.
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IPQoS [2]string // *
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KbdInteractiveAuthentication sshBool // *
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KerberosAuthentication sshBool // .
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LogLevel string // .
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MaxAuthTries int // .
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MaxSessions int // .
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PasswordAuthentication sshBool // .+
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PermitEmptyPasswords sshBool // +
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PermitListen string // *
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PermitOpen string // *
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PermitRootLogin string // .+
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PermitTTY sshBool // .
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PermitTunnel string // .
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PermitUserRC sshBool // *
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PubkeyAcceptedKeyTypes []string // *
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PubkeyAuthentication sshBool // .+
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RekeyLimit string // .
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RevokedKeys string // *
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RDomain string // *
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SetEnv map[string]string // *
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// max is 4095, it goes in the config as an octal.
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StreamLocalBindMask uint16 // *
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StreamLocalBindUnlink sshBool // *
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TrustedUserCAKeys string // *
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X11DisplayOffset int // .
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X11Forwarding sshBool // .
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}
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// SshdConf represents an /etc/ssh/sshd_config file's directives/values.
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// Values in SshdMatchRule are not reproduced here.
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type SshdConf struct {
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SshdMatchRule
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AddressFamily string // .
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CASignatureAlgorithms []string // *
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ChallengeResponseAuthentication sshBool // .+
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Ciphers []string // +*
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Compression string // .
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DisableForwarding sshBool // *
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ExposeAuthInfo sshBool // *
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FingerprintHash string // *
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GSSAPICleanupCredentials sshBool // .
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GSSAPIStrictAcceptorCheck sshBool // *
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HostCertificate string // *
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HostKeyAgent string // *
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HostKeyAlgorithms []string // +*
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HostKey []string // .
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IgnoreUserKnownHosts sshBool // .
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KerberosGetAFSToken sshBool // .
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KerberosOrLocalPasswd sshBool // .
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KerberosTicketCleanup sshBool // .
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KexAlgorithms string // +*
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ListenAddress ListenAddr // .
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LoginGraceTime string // .
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MACs []string // +*
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Match map[string]string // .
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MaxStartups string // .
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PermitUserEnvironment sshBool // .
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PidFile string // .
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Port uint16 // .
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PrintLastLog sshBool // .+
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PrintMotd sshBool // .
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Protocol int // +*
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PubkeyAuthOptions string // *
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SecurityKeyProvider string // *
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StrictModes sshBool // .+
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Subsystem string // .
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SyslogFacility string // .
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TCPKeepAlive sshBool // .
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UseDNS sshBool // .
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UsePAM sshBool // .
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VersionAddendum string // .
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X11UseLocalhost sshBool // .
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XAuthLocation string // *
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}
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// SshConf represents an /etc/ssh/ssh_config (or ~/.ssh/config) file
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type SshConf struct {
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// These are in the default upstream sshd_config so we don't touch them. (Most, if not all, are commented out.)
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// We just have them here to parse them.
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Host map[string]string
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}
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type ListenAddr struct {
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Addr string // hostname|address, hostname:port, IPv4_address:port, or [hostname|address]:port in conf string.
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Port uint16
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RDomain string
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}
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type MatchSshd struct {
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Criteria map[string]string
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Rules []SshdMatchRule
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}
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