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Diffstat (limited to 'servconf.h')
| -rw-r--r-- | servconf.h | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/servconf.h b/servconf.h new file mode 100644 index 0000000..7ad43de --- /dev/null +++ b/servconf.h @@ -0,0 +1,321 @@ +/* $OpenBSD: servconf.h,v 1.159 2023/01/17 09:44:48 djm Exp $ */ + +/* + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * Definitions for server configuration data and for the functions reading it. + * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * incompatible with the protocol description in the RFC file, it must be + * called by a name other than "ssh" or "Secure Shell". + */ + +#ifndef SERVCONF_H +#define SERVCONF_H + +#include <openbsd-compat/sys-queue.h> + +#define MAX_PORTS 256 /* Max # ports. */ + +#define MAX_SUBSYSTEMS 256 /* Max # subsystems. */ + +/* permit_root_login */ +#define PERMIT_NOT_SET -1 +#define PERMIT_NO 0 +#define PERMIT_FORCED_ONLY 1 +#define PERMIT_NO_PASSWD 2 +#define PERMIT_YES 3 + +/* use_privsep */ +#define PRIVSEP_OFF 0 +#define PRIVSEP_ON 1 +#define PRIVSEP_NOSANDBOX 2 + +/* PermitOpen */ +#define PERMITOPEN_ANY 0 +#define PERMITOPEN_NONE -2 + +/* IgnoreRhosts */ +#define IGNORE_RHOSTS_NO 0 +#define IGNORE_RHOSTS_YES 1 +#define IGNORE_RHOSTS_SHOSTS 2 + +#define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */ +#define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */ + +/* Magic name for internal sftp-server */ +#define INTERNAL_SFTP_NAME "internal-sftp" + +/* PubkeyAuthOptions flags */ +#define PUBKEYAUTH_TOUCH_REQUIRED (1) +#define PUBKEYAUTH_VERIFY_REQUIRED (1<<1) + +struct ssh; +struct fwd_perm_list; + +/* + * Used to store addresses from ListenAddr directives. These may be + * incomplete, as they may specify addresses that need to be merged + * with any ports requested by ListenPort. + */ +struct queued_listenaddr { + char *addr; + int port; /* <=0 if unspecified */ + char *rdomain; +}; + +/* Resolved listen addresses, grouped by optional routing domain */ +struct listenaddr { + char *rdomain; + struct addrinfo *addrs; +}; + +typedef struct { + u_int num_ports; + u_int ports_from_cmdline; + int ports[MAX_PORTS]; /* Port number to listen on. */ + struct queued_listenaddr *queued_listen_addrs; + u_int num_queued_listens; + struct listenaddr *listen_addrs; + u_int num_listen_addrs; + int address_family; /* Address family used by the server. */ + + char *routing_domain; /* Bind session to routing domain */ + + char **host_key_files; /* Files containing host keys. */ + int *host_key_file_userprovided; /* Key was specified by user. */ + u_int num_host_key_files; /* Number of files for host keys. */ + char **host_cert_files; /* Files containing host certs. */ + u_int num_host_cert_files; /* Number of files for host certs. */ + + char *host_key_agent; /* ssh-agent socket for host keys. */ + char *pid_file; /* Where to put our pid */ + char *moduli_file; /* moduli file for DH-GEX */ + int login_grace_time; /* Disconnect if no auth in this time + * (sec). */ + int permit_root_login; /* PERMIT_*, see above */ + int ignore_rhosts; /* Ignore .rhosts and .shosts. */ + int ignore_user_known_hosts; /* Ignore ~/.ssh/known_hosts + * for RhostsRsaAuth */ + int print_motd; /* If true, print /etc/motd. */ + int print_lastlog; /* If true, print lastlog */ + int x11_forwarding; /* If true, permit inet (spoofing) X11 fwd. */ + int x11_display_offset; /* What DISPLAY number to start + * searching at */ + int x11_use_localhost; /* If true, use localhost for fake X11 server. */ + char *xauth_location; /* Location of xauth program */ + int permit_tty; /* If false, deny pty allocation */ + int permit_user_rc; /* If false, deny ~/.ssh/rc execution */ + int strict_modes; /* If true, require string home dir modes. */ + int tcp_keep_alive; /* If true, set SO_KEEPALIVE. */ + int ip_qos_interactive; /* IP ToS/DSCP/class for interactive */ + int ip_qos_bulk; /* IP ToS/DSCP/class for bulk traffic */ + char *ciphers; /* Supported SSH2 ciphers. */ + char *macs; /* Supported SSH2 macs. */ + char *kex_algorithms; /* SSH2 kex methods in order of preference. */ + struct ForwardOptions fwd_opts; /* forwarding options */ + SyslogFacility log_facility; /* Facility for system logging. */ + LogLevel log_level; /* Level for system logging. */ + u_int num_log_verbose; /* Verbose log overrides */ + char **log_verbose; + int hostbased_authentication; /* If true, permit ssh2 hostbased auth */ + int hostbased_uses_name_from_packet_only; /* experimental */ + char *hostbased_accepted_algos; /* Algos allowed for hostbased */ + char *hostkeyalgorithms; /* SSH2 server key types */ + char *ca_sign_algorithms; /* Allowed CA signature algorithms */ + int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */ + char *pubkey_accepted_algos; /* Signature algos allowed for pubkey */ + int pubkey_auth_options; /* -1 or mask of PUBKEYAUTH_* flags */ + int kerberos_authentication; /* If true, permit Kerberos + * authentication. */ + int kerberos_or_local_passwd; /* If true, permit kerberos + * and any other password + * authentication mechanism, + * such as SecurID or + * /etc/passwd */ + int kerberos_ticket_cleanup; /* If true, destroy ticket + * file on logout. */ + int kerberos_get_afs_token; /* If true, try to get AFS token if + * authenticated with Kerberos. */ + int gss_authentication; /* If true, permit GSSAPI authentication */ + int gss_cleanup_creds; /* If true, destroy cred cache on logout */ + int gss_strict_acceptor; /* If true, restrict the GSSAPI acceptor name */ + int password_authentication; /* If true, permit password + * authentication. */ + int kbd_interactive_authentication; /* If true, permit */ + int permit_empty_passwd; /* If false, do not permit empty + * passwords. */ + int permit_user_env; /* If true, read ~/.ssh/environment */ + char *permit_user_env_allowlist; /* pattern-list of allowed env names */ + int compression; /* If true, compression is allowed */ + int allow_tcp_forwarding; /* One of FORWARD_* */ + int allow_streamlocal_forwarding; /* One of FORWARD_* */ + int allow_agent_forwarding; + int disable_forwarding; + u_int num_allow_users; + char **allow_users; + u_int num_deny_users; + char **deny_users; + u_int num_allow_groups; + char **allow_groups; + u_int num_deny_groups; + char **deny_groups; + + u_int num_subsystems; + char *subsystem_name[MAX_SUBSYSTEMS]; + char *subsystem_command[MAX_SUBSYSTEMS]; + char *subsystem_args[MAX_SUBSYSTEMS]; + + u_int num_accept_env; + char **accept_env; + u_int num_setenv; + char **setenv; + + int max_startups_begin; + int max_startups_rate; + int max_startups; + int per_source_max_startups; + int per_source_masklen_ipv4; + int per_source_masklen_ipv6; + int max_authtries; + int max_sessions; + char *banner; /* SSH-2 banner message */ + int use_dns; + int client_alive_interval; /* + * poke the client this often to + * see if it's still there + */ + int client_alive_count_max; /* + * If the client is unresponsive + * for this many intervals above, + * disconnect the session + */ + + u_int num_authkeys_files; /* Files containing public keys */ + char **authorized_keys_files; + + char *adm_forced_command; + + int use_pam; /* Enable auth via PAM */ + + int permit_tun; + + char **permitted_opens; /* May also be one of PERMITOPEN_* */ + u_int num_permitted_opens; + char **permitted_listens; /* May also be one of PERMITOPEN_* */ + u_int num_permitted_listens; + + char *chroot_directory; + char *revoked_keys_file; + char *trusted_user_ca_keys; + char *authorized_keys_command; + char *authorized_keys_command_user; + char *authorized_principals_file; + char *authorized_principals_command; + char *authorized_principals_command_user; + + int64_t rekey_limit; + int rekey_interval; + + char *version_addendum; /* Appended to SSH banner */ + + u_int num_auth_methods; + char **auth_methods; + + int fingerprint_hash; + int expose_userauth_info; + u_int64_t timing_secret; + char *sk_provider; + int required_rsa_size; /* minimum size of RSA keys */ + + char **channel_timeouts; /* inactivity timeout by channel type */ + u_int num_channel_timeouts; + + int unused_connection_timeout; +} ServerOptions; + +/* Information about the incoming connection as used by Match */ +struct connection_info { + const char *user; + const char *host; /* possibly resolved hostname */ + const char *address; /* remote address */ + const char *laddress; /* local address */ + int lport; /* local port */ + const char *rdomain; /* routing domain if available */ + int test; /* test mode, allow some attributes to be + * unspecified */ +}; + +/* List of included files for re-exec from the parsed configuration */ +struct include_item { + char *selector; + char *filename; + struct sshbuf *contents; + TAILQ_ENTRY(include_item) entry; +}; +TAILQ_HEAD(include_list, include_item); + + +/* + * These are string config options that must be copied between the + * Match sub-config and the main config, and must be sent from the + * privsep child to the privsep master. We use a macro to ensure all + * the options are copied and the copies are done in the correct order. + * + * NB. an option must appear in servconf.c:copy_set_server_options() or + * COPY_MATCH_STRING_OPTS here but never both. + */ +#define COPY_MATCH_STRING_OPTS() do { \ + M_CP_STROPT(banner); \ + M_CP_STROPT(trusted_user_ca_keys); \ + M_CP_STROPT(revoked_keys_file); \ + M_CP_STROPT(authorized_keys_command); \ + M_CP_STROPT(authorized_keys_command_user); \ + M_CP_STROPT(authorized_principals_file); \ + M_CP_STROPT(authorized_principals_command); \ + M_CP_STROPT(authorized_principals_command_user); \ + M_CP_STROPT(hostbased_accepted_algos); \ + M_CP_STROPT(pubkey_accepted_algos); \ + M_CP_STROPT(ca_sign_algorithms); \ + M_CP_STROPT(routing_domain); \ + M_CP_STROPT(permit_user_env_allowlist); \ + M_CP_STRARRAYOPT(authorized_keys_files, num_authkeys_files); \ + M_CP_STRARRAYOPT(allow_users, num_allow_users); \ + M_CP_STRARRAYOPT(deny_users, num_deny_users); \ + M_CP_STRARRAYOPT(allow_groups, num_allow_groups); \ + M_CP_STRARRAYOPT(deny_groups, num_deny_groups); \ + M_CP_STRARRAYOPT(accept_env, num_accept_env); \ + M_CP_STRARRAYOPT(setenv, num_setenv); \ + M_CP_STRARRAYOPT(auth_methods, num_auth_methods); \ + M_CP_STRARRAYOPT(permitted_opens, num_permitted_opens); \ + M_CP_STRARRAYOPT(permitted_listens, num_permitted_listens); \ + M_CP_STRARRAYOPT(channel_timeouts, num_channel_timeouts); \ + M_CP_STRARRAYOPT(log_verbose, num_log_verbose); \ + } while (0) + +struct connection_info *get_connection_info(struct ssh *, int, int); +void initialize_server_options(ServerOptions *); +void fill_default_server_options(ServerOptions *); +int process_server_config_line(ServerOptions *, char *, const char *, int, + int *, struct connection_info *, struct include_list *includes); +void process_permitopen(struct ssh *ssh, ServerOptions *options); +void process_channel_timeouts(struct ssh *ssh, ServerOptions *); +void load_server_config(const char *, struct sshbuf *); +void parse_server_config(ServerOptions *, const char *, struct sshbuf *, + struct include_list *includes, struct connection_info *, int); +void parse_server_match_config(ServerOptions *, + struct include_list *includes, struct connection_info *); +int parse_server_match_testspec(struct connection_info *, char *); +int server_match_spec_complete(struct connection_info *); +void copy_set_server_options(ServerOptions *, ServerOptions *, int); +void dump_config(ServerOptions *); +char *derelativise_path(const char *); +void servconf_add_hostkey(const char *, const int, + ServerOptions *, const char *path, int); +void servconf_add_hostcert(const char *, const int, + ServerOptions *, const char *path); + +#endif /* SERVCONF_H */ |