diff options
Diffstat (limited to 'crypto/openssh/servconf.c')
| -rw-r--r-- | crypto/openssh/servconf.c | 744 |
1 files changed, 744 insertions, 0 deletions
diff --git a/crypto/openssh/servconf.c b/crypto/openssh/servconf.c new file mode 100644 index 0000000..8ef1f09 --- /dev/null +++ b/crypto/openssh/servconf.c @@ -0,0 +1,744 @@ +/* + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * + * 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". + */ + +#include "includes.h" +RCSID("$OpenBSD: servconf.c,v 1.53 2000/10/14 12:12:09 markus Exp $"); +RCSID("$FreeBSD$"); + +#include "ssh.h" +#include "servconf.h" +#include "xmalloc.h" +#include "compat.h" + +/* add listen address */ +void add_listen_addr(ServerOptions *options, char *addr); + +/* Initializes the server options to their default values. */ + +void +initialize_server_options(ServerOptions *options) +{ + memset(options, 0, sizeof(*options)); + options->num_ports = 0; + options->ports_from_cmdline = 0; + options->listen_addrs = NULL; + options->host_key_file = NULL; + options->host_dsa_key_file = NULL; + options->pid_file = NULL; + options->server_key_bits = -1; + options->login_grace_time = -1; + options->key_regeneration_time = -1; + options->permit_root_login = -1; + options->ignore_rhosts = -1; + options->ignore_user_known_hosts = -1; + options->print_motd = -1; + options->check_mail = -1; + options->x11_forwarding = -1; + options->x11_display_offset = -1; + options->xauth_location = NULL; + options->strict_modes = -1; + options->keepalives = -1; + options->log_facility = (SyslogFacility) - 1; + options->log_level = (LogLevel) - 1; + options->rhosts_authentication = -1; + options->rhosts_rsa_authentication = -1; + options->rsa_authentication = -1; + options->dsa_authentication = -1; +#ifdef KRB4 + options->krb4_authentication = -1; + options->krb4_or_local_passwd = -1; + options->krb4_ticket_cleanup = -1; +#endif +#ifdef KRB5 + options->krb5_authentication = -1; + options->krb5_tgt_passing = -1; +#endif /* KRB5 */ +#ifdef AFS + options->krb4_tgt_passing = -1; + options->afs_token_passing = -1; +#endif + options->password_authentication = -1; + options->kbd_interactive_authentication = -1; +#ifdef SKEY + options->skey_authentication = -1; +#endif + options->permit_empty_passwd = -1; + options->use_login = -1; + options->allow_tcp_forwarding = -1; + options->num_allow_users = 0; + options->num_deny_users = 0; + options->num_allow_groups = 0; + options->num_deny_groups = 0; + options->ciphers = NULL; + options->protocol = SSH_PROTO_UNKNOWN; + options->gateway_ports = -1; + options->connections_per_period = 0; + options->connections_period = 0; + options->num_subsystems = 0; + options->max_startups_begin = -1; + options->max_startups_rate = -1; + options->max_startups = -1; +} + +void +fill_default_server_options(ServerOptions *options) +{ + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + if (options->listen_addrs == NULL) + add_listen_addr(options, NULL); + if (options->host_key_file == NULL) + options->host_key_file = HOST_KEY_FILE; + if (options->host_dsa_key_file == NULL) + options->host_dsa_key_file = HOST_DSA_KEY_FILE; + if (options->pid_file == NULL) + options->pid_file = SSH_DAEMON_PID_FILE; + if (options->server_key_bits == -1) + options->server_key_bits = 768; + if (options->login_grace_time == -1) + options->login_grace_time = 120; + if (options->key_regeneration_time == -1) + options->key_regeneration_time = 3600; + if (options->permit_root_login == -1) + options->permit_root_login = 0; /* no */ + if (options->ignore_rhosts == -1) + options->ignore_rhosts = 1; + if (options->ignore_user_known_hosts == -1) + options->ignore_user_known_hosts = 0; + if (options->check_mail == -1) + options->check_mail = 1; + if (options->print_motd == -1) + options->print_motd = 1; + if (options->x11_forwarding == -1) + options->x11_forwarding = 1; + if (options->x11_display_offset == -1) + options->x11_display_offset = 10; +#ifdef XAUTH_PATH + if (options->xauth_location == NULL) + options->xauth_location = XAUTH_PATH; +#endif /* XAUTH_PATH */ + if (options->strict_modes == -1) + options->strict_modes = 1; + if (options->keepalives == -1) + options->keepalives = 1; + if (options->log_facility == (SyslogFacility) (-1)) + options->log_facility = SYSLOG_FACILITY_AUTH; + if (options->log_level == (LogLevel) (-1)) + options->log_level = SYSLOG_LEVEL_INFO; + if (options->rhosts_authentication == -1) + options->rhosts_authentication = 0; + if (options->rhosts_rsa_authentication == -1) + options->rhosts_rsa_authentication = 0; + if (options->rsa_authentication == -1) + options->rsa_authentication = 1; + if (options->dsa_authentication == -1) + options->dsa_authentication = 1; +#ifdef KRB4 + if (options->krb4_authentication == -1) + options->krb4_authentication = (access(KEYFILE, R_OK) == 0); + if (options->krb4_or_local_passwd == -1) + options->krb4_or_local_passwd = 1; + if (options->krb4_ticket_cleanup == -1) + options->krb4_ticket_cleanup = 1; +#endif /* KRB4 */ +#ifdef KRB5 + if (options->krb5_authentication == -1) + options->krb5_authentication = 1; + if (options->krb5_tgt_passing == -1) + options->krb5_tgt_passing = 1; +#endif /* KRB5 */ +#ifdef AFS + if (options->krb4_tgt_passing == -1) + options->krb4_tgt_passing = 0; + if (options->afs_token_passing == -1) + options->afs_token_passing = k_hasafs(); +#endif /* AFS */ + if (options->password_authentication == -1) + options->password_authentication = 1; + if (options->kbd_interactive_authentication == -1) + options->kbd_interactive_authentication = 0; +#ifdef SKEY + if (options->skey_authentication == -1) + options->skey_authentication = 1; +#endif + if (options->permit_empty_passwd == -1) + options->permit_empty_passwd = 0; + if (options->use_login == -1) + options->use_login = 0; + if (options->allow_tcp_forwarding == -1) + options->allow_tcp_forwarding = 1; + if (options->protocol == SSH_PROTO_UNKNOWN) + options->protocol = SSH_PROTO_1|SSH_PROTO_2; + if (options->gateway_ports == -1) + options->gateway_ports = 0; + if (options->max_startups == -1) + options->max_startups = 10; + if (options->max_startups_rate == -1) + options->max_startups_rate = 100; /* 100% */ + if (options->max_startups_begin == -1) + options->max_startups_begin = options->max_startups; +} + +/* Keyword tokens. */ +typedef enum { + sBadOption, /* == unknown option */ + sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, + sPermitRootLogin, sLogFacility, sLogLevel, + sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, +#ifdef KRB4 + sKrb4Authentication, sKrb4OrLocalPasswd, sKrb4TicketCleanup, +#endif +#ifdef KRB5 + sKrb5Authentication, sKrb5TgtPassing, +#endif /* KRB5 */ +#ifdef AFS + sKrb4TgtPassing, sAFSTokenPassing, +#endif +#ifdef SKEY + sSkeyAuthentication, +#endif + sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, + sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, + sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, + sUseLogin, sAllowTcpForwarding, + sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, + sIgnoreUserKnownHosts, sHostDSAKeyFile, sCiphers, sProtocol, sPidFile, + sGatewayPorts, sDSAAuthentication, sConnectionsPerPeriod, sXAuthLocation, + sSubsystem, sMaxStartups +} ServerOpCodes; + +/* Textual representation of the tokens. */ +static struct { + const char *name; + ServerOpCodes opcode; +} keywords[] = { + { "port", sPort }, + { "hostkey", sHostKeyFile }, + { "hostdsakey", sHostDSAKeyFile }, + { "pidfile", sPidFile }, + { "serverkeybits", sServerKeyBits }, + { "logingracetime", sLoginGraceTime }, + { "keyregenerationinterval", sKeyRegenerationTime }, + { "permitrootlogin", sPermitRootLogin }, + { "syslogfacility", sLogFacility }, + { "loglevel", sLogLevel }, + { "rhostsauthentication", sRhostsAuthentication }, + { "rhostsrsaauthentication", sRhostsRSAAuthentication }, + { "rsaauthentication", sRSAAuthentication }, + { "dsaauthentication", sDSAAuthentication }, +#ifdef KRB4 + { "kerberos4authentication", sKrb4Authentication }, + { "kerberos4orlocalpasswd", sKrb4OrLocalPasswd }, + { "kerberos4ticketcleanup", sKrb4TicketCleanup }, +#endif +#ifdef KRB5 + { "kerberos5authentication", sKrb5Authentication }, + { "kerberos5tgtpassing", sKrb5TgtPassing }, +#endif /* KRB5 */ +#ifdef AFS + { "kerberos4tgtpassing", sKrb4TgtPassing }, + { "afstokenpassing", sAFSTokenPassing }, +#endif + { "passwordauthentication", sPasswordAuthentication }, + { "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, +#ifdef SKEY + { "skeyauthentication", sSkeyAuthentication }, +#endif + { "checkmail", sCheckMail }, + { "listenaddress", sListenAddress }, + { "printmotd", sPrintMotd }, + { "ignorerhosts", sIgnoreRhosts }, + { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, + { "x11forwarding", sX11Forwarding }, + { "x11displayoffset", sX11DisplayOffset }, + { "xauthlocation", sXAuthLocation }, + { "strictmodes", sStrictModes }, + { "permitemptypasswords", sEmptyPasswd }, + { "uselogin", sUseLogin }, + { "randomseed", sRandomSeedFile }, + { "keepalive", sKeepAlives }, + { "allowtcpforwarding", sAllowTcpForwarding }, + { "allowusers", sAllowUsers }, + { "denyusers", sDenyUsers }, + { "allowgroups", sAllowGroups }, + { "denygroups", sDenyGroups }, + { "ciphers", sCiphers }, + { "protocol", sProtocol }, + { "gatewayports", sGatewayPorts }, + { "connectionsperperiod", sConnectionsPerPeriod }, + { "subsystem", sSubsystem }, + { "maxstartups", sMaxStartups }, + { NULL, 0 } +}; + +/* + * Returns the number of the token pointed to by cp of length len. Never + * returns if the token is not known. + */ + +static ServerOpCodes +parse_token(const char *cp, const char *filename, + int linenum) +{ + unsigned int i; + + for (i = 0; keywords[i].name; i++) + if (strcasecmp(cp, keywords[i].name) == 0) + return keywords[i].opcode; + + fprintf(stderr, "%s: line %d: Bad configuration option: %s\n", + filename, linenum, cp); + return sBadOption; +} + +/* + * add listen address + */ +void +add_listen_addr(ServerOptions *options, char *addr) +{ + extern int IPv4or6; + struct addrinfo hints, *ai, *aitop; + char strport[NI_MAXSERV]; + int gaierr; + int i; + + if (options->num_ports == 0) + options->ports[options->num_ports++] = SSH_DEFAULT_PORT; + for (i = 0; i < options->num_ports; i++) { + memset(&hints, 0, sizeof(hints)); + hints.ai_family = IPv4or6; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0; + snprintf(strport, sizeof strport, "%d", options->ports[i]); + if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0) + fatal("bad addr or host: %s (%s)\n", + addr ? addr : "<NULL>", + gai_strerror(gaierr)); + for (ai = aitop; ai->ai_next; ai = ai->ai_next) + ; + ai->ai_next = options->listen_addrs; + options->listen_addrs = aitop; + } +} + +/* Reads the server configuration file. */ + +void +read_server_config(ServerOptions *options, const char *filename) +{ + FILE *f; + char line[1024]; + char *cp, **charptr, *arg; + int linenum, *intptr, value; + int bad_options = 0; + ServerOpCodes opcode; + int i; + + f = fopen(filename, "r"); + if (!f) { + perror(filename); + exit(1); + } + linenum = 0; + while (fgets(line, sizeof(line), f)) { + linenum++; + cp = line; + arg = strdelim(&cp); + /* Ignore leading whitespace */ + if (*arg == '\0') + arg = strdelim(&cp); + if (!*arg || *arg == '#') + continue; + opcode = parse_token(arg, filename, linenum); + switch (opcode) { + case sBadOption: + bad_options++; + continue; + case sPort: + /* ignore ports from configfile if cmdline specifies ports */ + if (options->ports_from_cmdline) + continue; + if (options->listen_addrs != NULL) + fatal("%s line %d: ports must be specified before " + "ListenAdress.\n", filename, linenum); + if (options->num_ports >= MAX_PORTS) + fatal("%s line %d: too many ports.\n", + filename, linenum); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing port number.\n", + filename, linenum); + options->ports[options->num_ports++] = atoi(arg); + break; + + case sServerKeyBits: + intptr = &options->server_key_bits; +parse_int: + arg = strdelim(&cp); + if (!arg || *arg == '\0') { + fprintf(stderr, "%s line %d: missing integer value.\n", + filename, linenum); + exit(1); + } + value = atoi(arg); + if (value == 0) { + fprintf(stderr, "%s line %d: invalid integer value.\n", + filename, linenum); + exit(1); + } + if (*intptr == -1) + *intptr = value; + break; + + case sLoginGraceTime: + intptr = &options->login_grace_time; + goto parse_int; + + case sKeyRegenerationTime: + intptr = &options->key_regeneration_time; + goto parse_int; + + case sListenAddress: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: missing inet addr.\n", + filename, linenum); + add_listen_addr(options, arg); + break; + + case sHostKeyFile: + case sHostDSAKeyFile: + charptr = (opcode == sHostKeyFile ) ? + &options->host_key_file : &options->host_dsa_key_file; +parse_filename: + arg = strdelim(&cp); + if (!arg || *arg == '\0') { + fprintf(stderr, "%s line %d: missing file name.\n", + filename, linenum); + exit(1); + } + if (*charptr == NULL) + *charptr = tilde_expand_filename(arg, getuid()); + break; + + case sPidFile: + charptr = &options->pid_file; + goto parse_filename; + + case sRandomSeedFile: + fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n", + filename, linenum); + arg = strdelim(&cp); + break; + + case sPermitRootLogin: + intptr = &options->permit_root_login; + arg = strdelim(&cp); + if (!arg || *arg == '\0') { + fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n", + filename, linenum); + exit(1); + } + if (strcmp(arg, "without-password") == 0) + value = 2; + else if (strcmp(arg, "yes") == 0) + value = 1; + else if (strcmp(arg, "no") == 0) + value = 0; + else { + fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n", + filename, linenum, arg); + exit(1); + } + if (*intptr == -1) + *intptr = value; + break; + + case sIgnoreRhosts: + intptr = &options->ignore_rhosts; +parse_flag: + arg = strdelim(&cp); + if (!arg || *arg == '\0') { + fprintf(stderr, "%s line %d: missing yes/no argument.\n", + filename, linenum); + exit(1); + } + if (strcmp(arg, "yes") == 0) + value = 1; + else if (strcmp(arg, "no") == 0) + value = 0; + else { + fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n", + filename, linenum, arg); + exit(1); + } + if (*intptr == -1) + *intptr = value; + break; + + case sIgnoreUserKnownHosts: + intptr = &options->ignore_user_known_hosts; + goto parse_flag; + + case sRhostsAuthentication: + intptr = &options->rhosts_authentication; + goto parse_flag; + + case sRhostsRSAAuthentication: + intptr = &options->rhosts_rsa_authentication; + goto parse_flag; + + case sRSAAuthentication: + intptr = &options->rsa_authentication; + goto parse_flag; + + case sDSAAuthentication: + intptr = &options->dsa_authentication; + goto parse_flag; + +#ifdef KRB4 + case sKrb4Authentication: + intptr = &options->krb4_authentication; + goto parse_flag; + + case sKrb4OrLocalPasswd: + intptr = &options->krb4_or_local_passwd; + goto parse_flag; + + case sKrb4TicketCleanup: + intptr = &options->krb4_ticket_cleanup; + goto parse_flag; +#endif + +#ifdef KRB5 + case sKrb5Authentication: + intptr = &options->krb5_authentication; + goto parse_flag; + + case sKrb5TgtPassing: + intptr = &options->krb5_tgt_passing; + goto parse_flag; +#endif /* KRB5 */ + +#ifdef AFS + case sKrb4TgtPassing: + intptr = &options->krb4_tgt_passing; + goto parse_flag; + + case sAFSTokenPassing: + intptr = &options->afs_token_passing; + goto parse_flag; +#endif + + case sPasswordAuthentication: + intptr = &options->password_authentication; + goto parse_flag; + + case sKbdInteractiveAuthentication: + intptr = &options->kbd_interactive_authentication; + goto parse_flag; + + case sCheckMail: + intptr = &options->check_mail; + goto parse_flag; + +#ifdef SKEY + case sSkeyAuthentication: + intptr = &options->skey_authentication; + goto parse_flag; +#endif + + case sPrintMotd: + intptr = &options->print_motd; + goto parse_flag; + + case sX11Forwarding: + intptr = &options->x11_forwarding; + goto parse_flag; + + case sX11DisplayOffset: + intptr = &options->x11_display_offset; + goto parse_int; + + case sXAuthLocation: + charptr = &options->xauth_location; + goto parse_filename; + + case sStrictModes: + intptr = &options->strict_modes; + goto parse_flag; + + case sKeepAlives: + intptr = &options->keepalives; + goto parse_flag; + + case sEmptyPasswd: + intptr = &options->permit_empty_passwd; + goto parse_flag; + + case sUseLogin: + intptr = &options->use_login; + goto parse_flag; + + case sGatewayPorts: + intptr = &options->gateway_ports; + goto parse_flag; + + case sLogFacility: + intptr = (int *) &options->log_facility; + arg = strdelim(&cp); + value = log_facility_number(arg); + if (value == (SyslogFacility) - 1) + fatal("%.200s line %d: unsupported log facility '%s'\n", + filename, linenum, arg ? arg : "<NONE>"); + if (*intptr == -1) + *intptr = (SyslogFacility) value; + break; + + case sLogLevel: + intptr = (int *) &options->log_level; + arg = strdelim(&cp); + value = log_level_number(arg); + if (value == (LogLevel) - 1) + fatal("%.200s line %d: unsupported log level '%s'\n", + filename, linenum, arg ? arg : "<NONE>"); + if (*intptr == -1) + *intptr = (LogLevel) value; + break; + + case sAllowTcpForwarding: + intptr = &options->allow_tcp_forwarding; + goto parse_flag; + + case sAllowUsers: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_allow_users >= MAX_ALLOW_USERS) + fatal("%.200s line %d: too many allow users.\n", + filename, linenum); + options->allow_users[options->num_allow_users++] = xstrdup(arg); + } + break; + + case sDenyUsers: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_deny_users >= MAX_DENY_USERS) + fatal("%.200s line %d: too many deny users.\n", + filename, linenum); + options->deny_users[options->num_deny_users++] = xstrdup(arg); + } + break; + + case sAllowGroups: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_allow_groups >= MAX_ALLOW_GROUPS) + fatal("%.200s line %d: too many allow groups.\n", + filename, linenum); + options->allow_groups[options->num_allow_groups++] = xstrdup(arg); + } + break; + + case sDenyGroups: + while ((arg = strdelim(&cp)) && *arg != '\0') { + if (options->num_deny_groups >= MAX_DENY_GROUPS) + fatal("%.200s line %d: too many deny groups.\n", + filename, linenum); + options->deny_groups[options->num_deny_groups++] = xstrdup(arg); + } + break; + + case sCiphers: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + if (!ciphers_valid(arg)) + fatal("%s line %d: Bad SSH2 cipher spec '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (options->ciphers == NULL) + options->ciphers = xstrdup(arg); + break; + + case sProtocol: + intptr = &options->protocol; + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing argument.", filename, linenum); + value = proto_spec(arg); + if (value == SSH_PROTO_UNKNOWN) + fatal("%s line %d: Bad protocol spec '%s'.", + filename, linenum, arg ? arg : "<NONE>"); + if (*intptr == SSH_PROTO_UNKNOWN) + *intptr = value; + break; + + case sConnectionsPerPeriod: + error("ConnectionsPerPeriod has been deprecated!"); + break; + + case sSubsystem: + if(options->num_subsystems >= MAX_SUBSYSTEMS) { + fatal("%s line %d: too many subsystems defined.", + filename, linenum); + } + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing subsystem name.", + filename, linenum); + for (i = 0; i < options->num_subsystems; i++) + if(strcmp(arg, options->subsystem_name[i]) == 0) + fatal("%s line %d: Subsystem '%s' already defined.", + filename, linenum, arg); + options->subsystem_name[options->num_subsystems] = xstrdup(arg); + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing subsystem command.", + filename, linenum); + options->subsystem_command[options->num_subsystems] = xstrdup(arg); + options->num_subsystems++; + break; + + case sMaxStartups: + arg = strdelim(&cp); + if (!arg || *arg == '\0') + fatal("%s line %d: Missing MaxStartups spec.", + filename, linenum); + if (sscanf(arg, "%d:%d:%d", + &options->max_startups_begin, + &options->max_startups_rate, + &options->max_startups) == 3) { + if (options->max_startups_begin > + options->max_startups || + options->max_startups_rate > 100 || + options->max_startups_rate < 1) + fatal("%s line %d: Illegal MaxStartups spec.", + filename, linenum); + break; + } + intptr = &options->max_startups; + goto parse_int; + + default: + fatal("%.200s line %d: Missing handler for opcode %s (%d)\n", + filename, linenum,arg, opcode); + } + if ((arg = strdelim(&cp)) != NULL && *arg != '\0') { + fprintf(stderr, + "%s line %d: garbage at end of line; \"%.200s\".\n", + filename, linenum, arg); + exit(1); + } + } + fclose(f); + if (bad_options > 0) { + fatal("%.200s: terminating, %d bad configuration options\n", + filename, bad_options); + } +} |
