306 lines
11 KiB
C
306 lines
11 KiB
C
/* $OpenBSD: servconf.h,v 1.144 2020/04/17 03:30:05 djm Exp $ */
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/*
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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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* Definitions for server configuration data and for the functions reading it.
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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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#ifndef SERVCONF_H
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#define SERVCONF_H
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#include <openbsd-compat/sys-queue.h>
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#define MAX_PORTS 256 /* Max # ports. */
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#define MAX_SUBSYSTEMS 256 /* Max # subsystems. */
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/* permit_root_login */
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#define PERMIT_NOT_SET -1
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#define PERMIT_NO 0
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#define PERMIT_FORCED_ONLY 1
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#define PERMIT_NO_PASSWD 2
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#define PERMIT_YES 3
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/* use_privsep */
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#define PRIVSEP_OFF 0
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#define PRIVSEP_ON 1
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#define PRIVSEP_NOSANDBOX 2
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/* PermitOpen */
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#define PERMITOPEN_ANY 0
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#define PERMITOPEN_NONE -2
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/* IgnoreRhosts */
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#define IGNORE_RHOSTS_NO 0
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#define IGNORE_RHOSTS_YES 1
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#define IGNORE_RHOSTS_SHOSTS 2
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#define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */
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#define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */
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/* Magic name for internal sftp-server */
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#define INTERNAL_SFTP_NAME "internal-sftp"
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/* PubkeyAuthOptions flags */
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#define PUBKEYAUTH_TOUCH_REQUIRED 1
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struct ssh;
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struct fwd_perm_list;
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/*
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* Used to store addresses from ListenAddr directives. These may be
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* incomplete, as they may specify addresses that need to be merged
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* with any ports requested by ListenPort.
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*/
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struct queued_listenaddr {
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char *addr;
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int port; /* <=0 if unspecified */
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char *rdomain;
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};
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/* Resolved listen addresses, grouped by optional routing domain */
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struct listenaddr {
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char *rdomain;
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struct addrinfo *addrs;
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};
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typedef struct {
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u_int num_ports;
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u_int ports_from_cmdline;
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int ports[MAX_PORTS]; /* Port number to listen on. */
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struct queued_listenaddr *queued_listen_addrs;
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u_int num_queued_listens;
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struct listenaddr *listen_addrs;
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u_int num_listen_addrs;
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int address_family; /* Address family used by the server. */
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char *routing_domain; /* Bind session to routing domain */
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char **host_key_files; /* Files containing host keys. */
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int *host_key_file_userprovided; /* Key was specified by user. */
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u_int num_host_key_files; /* Number of files for host keys. */
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char **host_cert_files; /* Files containing host certs. */
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u_int num_host_cert_files; /* Number of files for host certs. */
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char *host_key_agent; /* ssh-agent socket for host keys. */
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char *pid_file; /* Where to put our pid */
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int login_grace_time; /* Disconnect if no auth in this time
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* (sec). */
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int permit_root_login; /* PERMIT_*, see above */
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int ignore_rhosts; /* Ignore .rhosts and .shosts. */
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int ignore_user_known_hosts; /* Ignore ~/.ssh/known_hosts
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* for RhostsRsaAuth */
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int print_motd; /* If true, print /etc/motd. */
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int print_lastlog; /* If true, print lastlog */
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int x11_forwarding; /* If true, permit inet (spoofing) X11 fwd. */
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int x11_display_offset; /* What DISPLAY number to start
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* searching at */
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int x11_use_localhost; /* If true, use localhost for fake X11 server. */
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char *xauth_location; /* Location of xauth program */
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int permit_tty; /* If false, deny pty allocation */
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int permit_user_rc; /* If false, deny ~/.ssh/rc execution */
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int strict_modes; /* If true, require string home dir modes. */
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int tcp_keep_alive; /* If true, set SO_KEEPALIVE. */
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int ip_qos_interactive; /* IP ToS/DSCP/class for interactive */
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int ip_qos_bulk; /* IP ToS/DSCP/class for bulk traffic */
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char *ciphers; /* Supported SSH2 ciphers. */
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char *macs; /* Supported SSH2 macs. */
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char *kex_algorithms; /* SSH2 kex methods in order of preference. */
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struct ForwardOptions fwd_opts; /* forwarding options */
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SyslogFacility log_facility; /* Facility for system logging. */
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LogLevel log_level; /* Level for system logging. */
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int hostbased_authentication; /* If true, permit ssh2 hostbased auth */
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int hostbased_uses_name_from_packet_only; /* experimental */
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char *hostbased_key_types; /* Key types allowed for hostbased */
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char *hostkeyalgorithms; /* SSH2 server key types */
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char *ca_sign_algorithms; /* Allowed CA signature algorithms */
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int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */
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char *pubkey_key_types; /* Key types allowed for public key */
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int pubkey_auth_options; /* -1 or mask of PUBKEYAUTH_* flags */
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int kerberos_authentication; /* If true, permit Kerberos
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* authentication. */
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int kerberos_or_local_passwd; /* If true, permit kerberos
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* and any other password
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* authentication mechanism,
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* such as SecurID or
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* /etc/passwd */
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int kerberos_ticket_cleanup; /* If true, destroy ticket
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* file on logout. */
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int kerberos_get_afs_token; /* If true, try to get AFS token if
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* authenticated with Kerberos. */
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int gss_authentication; /* If true, permit GSSAPI authentication */
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int gss_cleanup_creds; /* If true, destroy cred cache on logout */
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int gss_strict_acceptor; /* If true, restrict the GSSAPI acceptor name */
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int password_authentication; /* If true, permit password
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* authentication. */
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int kbd_interactive_authentication; /* If true, permit */
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int challenge_response_authentication;
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int permit_empty_passwd; /* If false, do not permit empty
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* passwords. */
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int permit_user_env; /* If true, read ~/.ssh/environment */
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char *permit_user_env_whitelist; /* pattern-list whitelist */
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int compression; /* If true, compression is allowed */
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int allow_tcp_forwarding; /* One of FORWARD_* */
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int allow_streamlocal_forwarding; /* One of FORWARD_* */
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int allow_agent_forwarding;
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int disable_forwarding;
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u_int num_allow_users;
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char **allow_users;
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u_int num_deny_users;
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char **deny_users;
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u_int num_allow_groups;
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char **allow_groups;
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u_int num_deny_groups;
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char **deny_groups;
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u_int num_subsystems;
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char *subsystem_name[MAX_SUBSYSTEMS];
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char *subsystem_command[MAX_SUBSYSTEMS];
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char *subsystem_args[MAX_SUBSYSTEMS];
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u_int num_accept_env;
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char **accept_env;
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u_int num_setenv;
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char **setenv;
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int max_startups_begin;
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int max_startups_rate;
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int max_startups;
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int max_authtries;
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int max_sessions;
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char *banner; /* SSH-2 banner message */
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int use_dns;
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int client_alive_interval; /*
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* poke the client this often to
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* see if it's still there
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*/
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int client_alive_count_max; /*
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* If the client is unresponsive
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* for this many intervals above,
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* disconnect the session
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*/
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u_int num_authkeys_files; /* Files containing public keys */
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char **authorized_keys_files;
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char *adm_forced_command;
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int use_pam; /* Enable auth via PAM */
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int permit_tun;
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char **permitted_opens; /* May also be one of PERMITOPEN_* */
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u_int num_permitted_opens;
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char **permitted_listens; /* May also be one of PERMITOPEN_* */
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u_int num_permitted_listens;
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char *chroot_directory;
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char *revoked_keys_file;
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char *trusted_user_ca_keys;
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char *authorized_keys_command;
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char *authorized_keys_command_user;
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char *authorized_principals_file;
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char *authorized_principals_command;
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char *authorized_principals_command_user;
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int64_t rekey_limit;
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int rekey_interval;
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char *version_addendum; /* Appended to SSH banner */
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u_int num_auth_methods;
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char **auth_methods;
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int fingerprint_hash;
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int expose_userauth_info;
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u_int64_t timing_secret;
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char *sk_provider;
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} ServerOptions;
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/* Information about the incoming connection as used by Match */
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struct connection_info {
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const char *user;
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const char *host; /* possibly resolved hostname */
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const char *address; /* remote address */
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const char *laddress; /* local address */
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int lport; /* local port */
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const char *rdomain; /* routing domain if available */
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int test; /* test mode, allow some attributes to be
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* unspecified */
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};
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/* List of included files for re-exec from the parsed configuration */
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struct include_item {
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char *selector;
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char *filename;
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struct sshbuf *contents;
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TAILQ_ENTRY(include_item) entry;
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};
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TAILQ_HEAD(include_list, include_item);
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/*
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* These are string config options that must be copied between the
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* Match sub-config and the main config, and must be sent from the
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* privsep slave to the privsep master. We use a macro to ensure all
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* the options are copied and the copies are done in the correct order.
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*
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* NB. an option must appear in servconf.c:copy_set_server_options() or
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* COPY_MATCH_STRING_OPTS here but never both.
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*/
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#define COPY_MATCH_STRING_OPTS() do { \
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M_CP_STROPT(banner); \
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M_CP_STROPT(trusted_user_ca_keys); \
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M_CP_STROPT(revoked_keys_file); \
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M_CP_STROPT(authorized_keys_command); \
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M_CP_STROPT(authorized_keys_command_user); \
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M_CP_STROPT(authorized_principals_file); \
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M_CP_STROPT(authorized_principals_command); \
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M_CP_STROPT(authorized_principals_command_user); \
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M_CP_STROPT(hostbased_key_types); \
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M_CP_STROPT(pubkey_key_types); \
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M_CP_STROPT(ca_sign_algorithms); \
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M_CP_STROPT(routing_domain); \
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M_CP_STROPT(permit_user_env_whitelist); \
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M_CP_STRARRAYOPT(authorized_keys_files, num_authkeys_files); \
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M_CP_STRARRAYOPT(allow_users, num_allow_users); \
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M_CP_STRARRAYOPT(deny_users, num_deny_users); \
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M_CP_STRARRAYOPT(allow_groups, num_allow_groups); \
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M_CP_STRARRAYOPT(deny_groups, num_deny_groups); \
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M_CP_STRARRAYOPT(accept_env, num_accept_env); \
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M_CP_STRARRAYOPT(auth_methods, num_auth_methods); \
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M_CP_STRARRAYOPT(permitted_opens, num_permitted_opens); \
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M_CP_STRARRAYOPT(permitted_listens, num_permitted_listens); \
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} while (0)
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struct connection_info *get_connection_info(struct ssh *, int, int);
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void initialize_server_options(ServerOptions *);
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void fill_default_server_options(ServerOptions *);
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int process_server_config_line(ServerOptions *, char *, const char *, int,
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int *, struct connection_info *, struct include_list *includes);
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void process_permitopen(struct ssh *ssh, ServerOptions *options);
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void load_server_config(const char *, struct sshbuf *);
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void parse_server_config(ServerOptions *, const char *, struct sshbuf *,
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struct include_list *includes, struct connection_info *);
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void parse_server_match_config(ServerOptions *,
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struct include_list *includes, struct connection_info *);
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int parse_server_match_testspec(struct connection_info *, char *);
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int server_match_spec_complete(struct connection_info *);
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void copy_set_server_options(ServerOptions *, ServerOptions *, int);
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void dump_config(ServerOptions *);
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char *derelativise_path(const char *);
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void servconf_add_hostkey(const char *, const int,
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ServerOptions *, const char *path, int);
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void servconf_add_hostcert(const char *, const int,
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ServerOptions *, const char *path);
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#endif /* SERVCONF_H */
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