1 /* $OpenBSD: servconf.h,v 1.123 2016/11/30 03:00:05 djm 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 * Definitions for server configuration data and for the functions reading it. 8 * 9 * As far as I am concerned, the code I have written for this software 10 * can be used freely for any purpose. Any derived versions of this 11 * software must be clearly marked as such, and if the derived work is 12 * incompatible with the protocol description in the RFC file, it must be 13 * called by a name other than "ssh" or "Secure Shell". 14 */ 15 16 #ifndef SERVCONF_H 17 #define SERVCONF_H 18 19 #define MAX_PORTS 256 /* Max # ports. */ 20 21 #define MAX_ALLOW_USERS 256 /* Max # users on allow list. */ 22 #define MAX_DENY_USERS 256 /* Max # users on deny list. */ 23 #define MAX_ALLOW_GROUPS 256 /* Max # groups on allow list. */ 24 #define MAX_DENY_GROUPS 256 /* Max # groups on deny list. */ 25 #define MAX_SUBSYSTEMS 256 /* Max # subsystems. */ 26 #define MAX_HOSTKEYS 256 /* Max # hostkeys. */ 27 #define MAX_HOSTCERTS 256 /* Max # host certificates. */ 28 #define MAX_ACCEPT_ENV 256 /* Max # of env vars. */ 29 #define MAX_MATCH_GROUPS 256 /* Max # of groups for Match. */ 30 #define MAX_AUTHKEYS_FILES 256 /* Max # of authorized_keys files. */ 31 #define MAX_AUTH_METHODS 256 /* Max # of AuthenticationMethods. */ 32 33 /* permit_root_login */ 34 #define PERMIT_NOT_SET -1 35 #define PERMIT_NO 0 36 #define PERMIT_FORCED_ONLY 1 37 #define PERMIT_NO_PASSWD 2 38 #define PERMIT_YES 3 39 40 /* use_privsep */ 41 #define PRIVSEP_OFF 0 42 #define PRIVSEP_ON 1 43 #define PRIVSEP_NOSANDBOX 2 44 45 /* AllowTCPForwarding */ 46 #define FORWARD_DENY 0 47 #define FORWARD_REMOTE (1) 48 #define FORWARD_LOCAL (1<<1) 49 #define FORWARD_ALLOW (FORWARD_REMOTE|FORWARD_LOCAL) 50 51 #define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */ 52 #define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */ 53 54 /* Magic name for internal sftp-server */ 55 #define INTERNAL_SFTP_NAME "internal-sftp" 56 57 typedef struct { 58 u_int num_ports; 59 u_int ports_from_cmdline; 60 int ports[MAX_PORTS]; /* Port number to listen on. */ 61 u_int num_queued_listens; 62 char **queued_listen_addrs; 63 int *queued_listen_ports; 64 struct addrinfo *listen_addrs; /* Addresses on which the server listens. */ 65 int address_family; /* Address family used by the server. */ 66 char *host_key_files[MAX_HOSTKEYS]; /* Files containing host keys. */ 67 int num_host_key_files; /* Number of files for host keys. */ 68 char *host_cert_files[MAX_HOSTCERTS]; /* Files containing host certs. */ 69 int num_host_cert_files; /* Number of files for host certs. */ 70 char *host_key_agent; /* ssh-agent socket for host keys. */ 71 char *pid_file; /* Where to put our pid */ 72 int login_grace_time; /* Disconnect if no auth in this time 73 * (sec). */ 74 int permit_root_login; /* PERMIT_*, see above */ 75 int ignore_rhosts; /* Ignore .rhosts and .shosts. */ 76 int ignore_user_known_hosts; /* Ignore ~/.ssh/known_hosts 77 * for RhostsRsaAuth */ 78 int print_motd; /* If true, print /etc/motd. */ 79 int print_lastlog; /* If true, print lastlog */ 80 int x11_forwarding; /* If true, permit inet (spoofing) X11 fwd. */ 81 int x11_display_offset; /* What DISPLAY number to start 82 * searching at */ 83 int x11_use_localhost; /* If true, use localhost for fake X11 server. */ 84 char *xauth_location; /* Location of xauth program */ 85 int permit_tty; /* If false, deny pty allocation */ 86 int permit_user_rc; /* If false, deny ~/.ssh/rc execution */ 87 int strict_modes; /* If true, require string home dir modes. */ 88 int tcp_keep_alive; /* If true, set SO_KEEPALIVE. */ 89 int ip_qos_interactive; /* IP ToS/DSCP/class for interactive */ 90 int ip_qos_bulk; /* IP ToS/DSCP/class for bulk traffic */ 91 char *ciphers; /* Supported SSH2 ciphers. */ 92 char *macs; /* Supported SSH2 macs. */ 93 char *kex_algorithms; /* SSH2 kex methods in order of preference. */ 94 struct ForwardOptions fwd_opts; /* forwarding options */ 95 SyslogFacility log_facility; /* Facility for system logging. */ 96 LogLevel log_level; /* Level for system logging. */ 97 int hostbased_authentication; /* If true, permit ssh2 hostbased auth */ 98 int hostbased_uses_name_from_packet_only; /* experimental */ 99 char *hostbased_key_types; /* Key types allowed for hostbased */ 100 char *hostkeyalgorithms; /* SSH2 server key types */ 101 int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */ 102 char *pubkey_key_types; /* Key types allowed for public key */ 103 int kerberos_authentication; /* If true, permit Kerberos 104 * authentication. */ 105 int kerberos_or_local_passwd; /* If true, permit kerberos 106 * and any other password 107 * authentication mechanism, 108 * such as SecurID or 109 * /etc/passwd */ 110 int kerberos_ticket_cleanup; /* If true, destroy ticket 111 * file on logout. */ 112 int kerberos_get_afs_token; /* If true, try to get AFS token if 113 * authenticated with Kerberos. */ 114 int gss_authentication; /* If true, permit GSSAPI authentication */ 115 int gss_cleanup_creds; /* If true, destroy cred cache on logout */ 116 int gss_strict_acceptor; /* If true, restrict the GSSAPI acceptor name */ 117 int password_authentication; /* If true, permit password 118 * authentication. */ 119 int kbd_interactive_authentication; /* If true, permit */ 120 int challenge_response_authentication; 121 int permit_empty_passwd; /* If false, do not permit empty 122 * passwords. */ 123 int permit_user_env; /* If true, read ~/.ssh/environment */ 124 int compression; /* If true, compression is allowed */ 125 int allow_tcp_forwarding; /* One of FORWARD_* */ 126 int allow_streamlocal_forwarding; /* One of FORWARD_* */ 127 int allow_agent_forwarding; 128 int disable_forwarding; 129 u_int num_allow_users; 130 char *allow_users[MAX_ALLOW_USERS]; 131 u_int num_deny_users; 132 char *deny_users[MAX_DENY_USERS]; 133 u_int num_allow_groups; 134 char *allow_groups[MAX_ALLOW_GROUPS]; 135 u_int num_deny_groups; 136 char *deny_groups[MAX_DENY_GROUPS]; 137 138 u_int num_subsystems; 139 char *subsystem_name[MAX_SUBSYSTEMS]; 140 char *subsystem_command[MAX_SUBSYSTEMS]; 141 char *subsystem_args[MAX_SUBSYSTEMS]; 142 143 u_int num_accept_env; 144 char *accept_env[MAX_ACCEPT_ENV]; 145 146 int max_startups_begin; 147 int max_startups_rate; 148 int max_startups; 149 int max_authtries; 150 int max_sessions; 151 char *banner; /* SSH-2 banner message */ 152 int use_dns; 153 int client_alive_interval; /* 154 * poke the client this often to 155 * see if it's still there 156 */ 157 int client_alive_count_max; /* 158 * If the client is unresponsive 159 * for this many intervals above, 160 * disconnect the session 161 */ 162 163 u_int num_authkeys_files; /* Files containing public keys */ 164 char *authorized_keys_files[MAX_AUTHKEYS_FILES]; 165 166 char *adm_forced_command; 167 168 int use_pam; /* Enable auth via PAM */ 169 170 int permit_tun; 171 172 int num_permitted_opens; 173 174 char *chroot_directory; 175 char *revoked_keys_file; 176 char *trusted_user_ca_keys; 177 char *authorized_keys_command; 178 char *authorized_keys_command_user; 179 char *authorized_principals_file; 180 char *authorized_principals_command; 181 char *authorized_principals_command_user; 182 183 int64_t rekey_limit; 184 int rekey_interval; 185 186 char *version_addendum; /* Appended to SSH banner */ 187 188 u_int num_auth_methods; 189 char *auth_methods[MAX_AUTH_METHODS]; 190 191 int fingerprint_hash; 192 } ServerOptions; 193 194 /* Information about the incoming connection as used by Match */ 195 struct connection_info { 196 const char *user; 197 const char *host; /* possibly resolved hostname */ 198 const char *address; /* remote address */ 199 const char *laddress; /* local address */ 200 int lport; /* local port */ 201 }; 202 203 204 /* 205 * These are string config options that must be copied between the 206 * Match sub-config and the main config, and must be sent from the 207 * privsep slave to the privsep master. We use a macro to ensure all 208 * the options are copied and the copies are done in the correct order. 209 * 210 * NB. an option must appear in servconf.c:copy_set_server_options() or 211 * COPY_MATCH_STRING_OPTS here but never both. 212 */ 213 #define COPY_MATCH_STRING_OPTS() do { \ 214 M_CP_STROPT(banner); \ 215 M_CP_STROPT(trusted_user_ca_keys); \ 216 M_CP_STROPT(revoked_keys_file); \ 217 M_CP_STROPT(authorized_keys_command); \ 218 M_CP_STROPT(authorized_keys_command_user); \ 219 M_CP_STROPT(authorized_principals_file); \ 220 M_CP_STROPT(authorized_principals_command); \ 221 M_CP_STROPT(authorized_principals_command_user); \ 222 M_CP_STROPT(hostbased_key_types); \ 223 M_CP_STROPT(pubkey_key_types); \ 224 M_CP_STRARRAYOPT(authorized_keys_files, num_authkeys_files); \ 225 M_CP_STRARRAYOPT(allow_users, num_allow_users); \ 226 M_CP_STRARRAYOPT(deny_users, num_deny_users); \ 227 M_CP_STRARRAYOPT(allow_groups, num_allow_groups); \ 228 M_CP_STRARRAYOPT(deny_groups, num_deny_groups); \ 229 M_CP_STRARRAYOPT(accept_env, num_accept_env); \ 230 M_CP_STRARRAYOPT(auth_methods, num_auth_methods); \ 231 } while (0) 232 233 struct connection_info *get_connection_info(int, int); 234 void initialize_server_options(ServerOptions *); 235 void fill_default_server_options(ServerOptions *); 236 int process_server_config_line(ServerOptions *, char *, const char *, int, 237 int *, struct connection_info *); 238 void load_server_config(const char *, Buffer *); 239 void parse_server_config(ServerOptions *, const char *, Buffer *, 240 struct connection_info *); 241 void parse_server_match_config(ServerOptions *, struct connection_info *); 242 int parse_server_match_testspec(struct connection_info *, char *); 243 int server_match_spec_complete(struct connection_info *); 244 void copy_set_server_options(ServerOptions *, ServerOptions *, int); 245 void dump_config(ServerOptions *); 246 char *derelativise_path(const char *); 247 248 #endif /* SERVCONF_H */ 249