1 /* $OpenBSD: servconf.h,v 1.116 2015/01/13 07:39:19 djm Exp $ */ 2 3 /* 4 * Author: Tatu Ylonen <ylo (at) cs.hut.fi> 5 * Copyright (c) 1995 Tatu Ylonen <ylo (at) 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 char *listen_addr; /* Address on which the server listens. */ 62 struct addrinfo *listen_addrs; /* Addresses on which the server listens. */ 63 int address_family; /* Address family used by the server. */ 64 char *host_key_files[MAX_HOSTKEYS]; /* Files containing host keys. */ 65 int num_host_key_files; /* Number of files for host keys. */ 66 char *host_cert_files[MAX_HOSTCERTS]; /* Files containing host certs. */ 67 int num_host_cert_files; /* Number of files for host certs. */ 68 char *host_key_agent; /* ssh-agent socket for host keys. */ 69 char *pid_file; /* Where to put our pid */ 70 int server_key_bits;/* Size of the server key. */ 71 int login_grace_time; /* Disconnect if no auth in this time 72 * (sec). */ 73 int key_regeneration_time; /* Server key lifetime (seconds). */ 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 int protocol; /* Supported protocol versions. */ 95 struct ForwardOptions fwd_opts; /* forwarding options */ 96 SyslogFacility log_facility; /* Facility for system logging. */ 97 LogLevel log_level; /* Level for system logging. */ 98 int rhosts_rsa_authentication; /* If true, permit rhosts RSA 99 * authentication. */ 100 int hostbased_authentication; /* If true, permit ssh2 hostbased auth */ 101 int hostbased_uses_name_from_packet_only; /* experimental */ 102 char *hostbased_key_types; /* Key types allowed for hostbased */ 103 int rsa_authentication; /* If true, permit RSA authentication. */ 104 int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */ 105 char *pubkey_key_types; /* Key types allowed for public key */ 106 int kerberos_authentication; /* If true, permit Kerberos 107 * authentication. */ 108 int kerberos_or_local_passwd; /* If true, permit kerberos 109 * and any other password 110 * authentication mechanism, 111 * such as SecurID or 112 * /etc/passwd */ 113 int kerberos_ticket_cleanup; /* If true, destroy ticket 114 * file on logout. */ 115 int kerberos_get_afs_token; /* If true, try to get AFS token if 116 * authenticated with Kerberos. */ 117 int gss_authentication; /* If true, permit GSSAPI authentication */ 118 int gss_cleanup_creds; /* If true, destroy cred cache on logout */ 119 int password_authentication; /* If true, permit password 120 * authentication. */ 121 int kbd_interactive_authentication; /* If true, permit */ 122 int challenge_response_authentication; 123 int permit_empty_passwd; /* If false, do not permit empty 124 * passwords. */ 125 int permit_user_env; /* If true, read ~/.ssh/environment */ 126 int use_login; /* If true, login(1) is used */ 127 int compression; /* If true, compression is allowed */ 128 int allow_tcp_forwarding; /* One of FORWARD_* */ 129 int allow_streamlocal_forwarding; /* One of FORWARD_* */ 130 int allow_agent_forwarding; 131 u_int num_allow_users; 132 char *allow_users[MAX_ALLOW_USERS]; 133 u_int num_deny_users; 134 char *deny_users[MAX_DENY_USERS]; 135 u_int num_allow_groups; 136 char *allow_groups[MAX_ALLOW_GROUPS]; 137 u_int num_deny_groups; 138 char *deny_groups[MAX_DENY_GROUPS]; 139 140 u_int num_subsystems; 141 char *subsystem_name[MAX_SUBSYSTEMS]; 142 char *subsystem_command[MAX_SUBSYSTEMS]; 143 char *subsystem_args[MAX_SUBSYSTEMS]; 144 145 u_int num_accept_env; 146 char *accept_env[MAX_ACCEPT_ENV]; 147 148 int max_startups_begin; 149 int max_startups_rate; 150 int max_startups; 151 int max_authtries; 152 int max_sessions; 153 char *banner; /* SSH-2 banner message */ 154 int use_dns; 155 int client_alive_interval; /* 156 * poke the client this often to 157 * see if it's still there 158 */ 159 int client_alive_count_max; /* 160 * If the client is unresponsive 161 * for this many intervals above, 162 * disconnect the session 163 */ 164 165 u_int num_authkeys_files; /* Files containing public keys */ 166 char *authorized_keys_files[MAX_AUTHKEYS_FILES]; 167 168 char *adm_forced_command; 169 170 int use_pam; /* Enable auth via PAM */ 171 172 int permit_tun; 173 174 int num_permitted_opens; 175 176 char *chroot_directory; 177 char *revoked_keys_file; 178 char *trusted_user_ca_keys; 179 char *authorized_principals_file; 180 char *authorized_keys_command; 181 char *authorized_keys_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_principals_file); \ 218 M_CP_STROPT(authorized_keys_command); \ 219 M_CP_STROPT(authorized_keys_command_user); \ 220 M_CP_STROPT(hostbased_key_types); \ 221 M_CP_STROPT(pubkey_key_types); \ 222 M_CP_STRARRAYOPT(authorized_keys_files, num_authkeys_files); \ 223 M_CP_STRARRAYOPT(allow_users, num_allow_users); \ 224 M_CP_STRARRAYOPT(deny_users, num_deny_users); \ 225 M_CP_STRARRAYOPT(allow_groups, num_allow_groups); \ 226 M_CP_STRARRAYOPT(deny_groups, num_deny_groups); \ 227 M_CP_STRARRAYOPT(accept_env, num_accept_env); \ 228 M_CP_STRARRAYOPT(auth_methods, num_auth_methods); \ 229 } while (0) 230 231 struct connection_info *get_connection_info(int, int); 232 void initialize_server_options(ServerOptions *); 233 void fill_default_server_options(ServerOptions *); 234 int process_server_config_line(ServerOptions *, char *, const char *, int, 235 int *, struct connection_info *); 236 void load_server_config(const char *, Buffer *); 237 void parse_server_config(ServerOptions *, const char *, Buffer *, 238 struct connection_info *); 239 void parse_server_match_config(ServerOptions *, struct connection_info *); 240 int parse_server_match_testspec(struct connection_info *, char *); 241 int server_match_spec_complete(struct connection_info *); 242 void copy_set_server_options(ServerOptions *, ServerOptions *, int); 243 void dump_config(ServerOptions *); 244 char *derelativise_path(const char *); 245 246 #endif /* SERVCONF_H */ 247
