diff options
Diffstat (limited to 'crypto/openssh/servconf.c')
| -rw-r--r-- | crypto/openssh/servconf.c | 568 |
1 files changed, 568 insertions, 0 deletions
diff --git a/crypto/openssh/servconf.c b/crypto/openssh/servconf.c new file mode 100644 index 0000000..eb1b20e --- /dev/null +++ b/crypto/openssh/servconf.c @@ -0,0 +1,568 @@ +/* + * + * servconf.c + * + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * + * Created: Mon Aug 21 15:48:58 1995 ylo + * + */ + +#include "includes.h" +RCSID("$Id: servconf.c,v 1.29 2000/01/04 00:07:59 markus Exp $"); + +#include "ssh.h" +#include "servconf.h" +#include "xmalloc.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->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->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; +#ifdef KRB4 + options->kerberos_authentication = -1; + options->kerberos_or_local_passwd = -1; + options->kerberos_ticket_cleanup = -1; +#endif +#ifdef AFS + options->kerberos_tgt_passing = -1; + options->afs_token_passing = -1; +#endif + options->password_authentication = -1; +#ifdef SKEY + options->skey_authentication = -1; +#endif + options->permit_empty_passwd = -1; + options->use_login = -1; + options->num_allow_users = 0; + options->num_deny_users = 0; + options->num_allow_groups = 0; + options->num_deny_groups = 0; +} + +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->server_key_bits == -1) + options->server_key_bits = 768; + if (options->login_grace_time == -1) + options->login_grace_time = 600; + if (options->key_regeneration_time == -1) + options->key_regeneration_time = 3600; + if (options->permit_root_login == -1) + options->permit_root_login = 1; /* yes */ + if (options->ignore_rhosts == -1) + options->ignore_rhosts = 0; + if (options->ignore_user_known_hosts == -1) + options->ignore_user_known_hosts = 0; + if (options->check_mail == -1) + options->check_mail = 0; + 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 = 1; + 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 = 1; + if (options->rsa_authentication == -1) + options->rsa_authentication = 1; +#ifdef KRB4 + if (options->kerberos_authentication == -1) + options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); + if (options->kerberos_or_local_passwd == -1) + options->kerberos_or_local_passwd = 1; + if (options->kerberos_ticket_cleanup == -1) + options->kerberos_ticket_cleanup = 1; +#endif /* KRB4 */ +#ifdef AFS + if (options->kerberos_tgt_passing == -1) + options->kerberos_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; +#ifdef SKEY + if (options->skey_authentication == -1) + options->skey_authentication = 1; +#endif + if (options->permit_empty_passwd == -1) + options->permit_empty_passwd = 1; + if (options->use_login == -1) + options->use_login = 0; +} + +#define WHITESPACE " \t\r\n" + +/* Keyword tokens. */ +typedef enum { + sBadOption, /* == unknown option */ + sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime, + sPermitRootLogin, sLogFacility, sLogLevel, + sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication, +#ifdef KRB4 + sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup, +#endif +#ifdef AFS + sKerberosTgtPassing, sAFSTokenPassing, +#endif +#ifdef SKEY + sSkeyAuthentication, +#endif + sPasswordAuthentication, sListenAddress, + sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, + sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, + sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, + sIgnoreUserKnownHosts +} ServerOpCodes; + +/* Textual representation of the tokens. */ +static struct { + const char *name; + ServerOpCodes opcode; +} keywords[] = { + { "port", sPort }, + { "hostkey", sHostKeyFile }, + { "serverkeybits", sServerKeyBits }, + { "logingracetime", sLoginGraceTime }, + { "keyregenerationinterval", sKeyRegenerationTime }, + { "permitrootlogin", sPermitRootLogin }, + { "syslogfacility", sLogFacility }, + { "loglevel", sLogLevel }, + { "rhostsauthentication", sRhostsAuthentication }, + { "rhostsrsaauthentication", sRhostsRSAAuthentication }, + { "rsaauthentication", sRSAAuthentication }, +#ifdef KRB4 + { "kerberosauthentication", sKerberosAuthentication }, + { "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, + { "kerberosticketcleanup", sKerberosTicketCleanup }, +#endif +#ifdef AFS + { "kerberostgtpassing", sKerberosTgtPassing }, + { "afstokenpassing", sAFSTokenPassing }, +#endif + { "passwordauthentication", sPasswordAuthentication }, +#ifdef SKEY + { "skeyauthentication", sSkeyAuthentication }, +#endif + { "checkmail", sCheckMail }, + { "listenaddress", sListenAddress }, + { "printmotd", sPrintMotd }, + { "ignorerhosts", sIgnoreRhosts }, + { "ignoreuserknownhosts", sIgnoreUserKnownHosts }, + { "x11forwarding", sX11Forwarding }, + { "x11displayoffset", sX11DisplayOffset }, + { "strictmodes", sStrictModes }, + { "permitemptypasswords", sEmptyPasswd }, + { "uselogin", sUseLogin }, + { "randomseed", sRandomSeedFile }, + { "keepalive", sKeepAlives }, + { "allowusers", sAllowUsers }, + { "denyusers", sDenyUsers }, + { "allowgroups", sAllowGroups }, + { "denygroups", sDenyGroups }, + { 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; + int linenum, *intptr, value; + int bad_options = 0; + ServerOpCodes opcode; + + f = fopen(filename, "r"); + if (!f) { + perror(filename); + exit(1); + } + linenum = 0; + while (fgets(line, sizeof(line), f)) { + linenum++; + cp = line + strspn(line, WHITESPACE); + if (!*cp || *cp == '#') + continue; + cp = strtok(cp, WHITESPACE); + opcode = parse_token(cp, 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); + cp = strtok(NULL, WHITESPACE); + if (!cp) + fatal("%s line %d: missing port number.\n", + filename, linenum); + options->ports[options->num_ports++] = atoi(cp); + break; + + case sServerKeyBits: + intptr = &options->server_key_bits; +parse_int: + cp = strtok(NULL, WHITESPACE); + if (!cp) { + fprintf(stderr, "%s line %d: missing integer value.\n", + filename, linenum); + exit(1); + } + value = atoi(cp); + 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: + cp = strtok(NULL, WHITESPACE); + if (!cp) + fatal("%s line %d: missing inet addr.\n", + filename, linenum); + add_listen_addr(options, cp); + break; + + case sHostKeyFile: + charptr = &options->host_key_file; + cp = strtok(NULL, WHITESPACE); + if (!cp) { + fprintf(stderr, "%s line %d: missing file name.\n", + filename, linenum); + exit(1); + } + if (*charptr == NULL) + *charptr = tilde_expand_filename(cp, getuid()); + break; + + case sRandomSeedFile: + fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n", + filename, linenum); + cp = strtok(NULL, WHITESPACE); + break; + + case sPermitRootLogin: + intptr = &options->permit_root_login; + cp = strtok(NULL, WHITESPACE); + if (!cp) { + fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n", + filename, linenum); + exit(1); + } + if (strcmp(cp, "without-password") == 0) + value = 2; + else if (strcmp(cp, "yes") == 0) + value = 1; + else if (strcmp(cp, "no") == 0) + value = 0; + else { + fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n", + filename, linenum, cp); + exit(1); + } + if (*intptr == -1) + *intptr = value; + break; + + case sIgnoreRhosts: + intptr = &options->ignore_rhosts; +parse_flag: + cp = strtok(NULL, WHITESPACE); + if (!cp) { + fprintf(stderr, "%s line %d: missing yes/no argument.\n", + filename, linenum); + exit(1); + } + if (strcmp(cp, "yes") == 0) + value = 1; + else if (strcmp(cp, "no") == 0) + value = 0; + else { + fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n", + filename, linenum, cp); + exit(1); + } + if (*intptr == -1) + *intptr = value; + break; + + case sIgnoreUserKnownHosts: + intptr = &options->ignore_user_known_hosts; + goto parse_int; + + 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; + +#ifdef KRB4 + case sKerberosAuthentication: + intptr = &options->kerberos_authentication; + goto parse_flag; + + case sKerberosOrLocalPasswd: + intptr = &options->kerberos_or_local_passwd; + goto parse_flag; + + case sKerberosTicketCleanup: + intptr = &options->kerberos_ticket_cleanup; + goto parse_flag; +#endif + +#ifdef AFS + case sKerberosTgtPassing: + intptr = &options->kerberos_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 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 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 sLogFacility: + intptr = (int *) &options->log_facility; + cp = strtok(NULL, WHITESPACE); + value = log_facility_number(cp); + if (value == (SyslogFacility) - 1) + fatal("%.200s line %d: unsupported log facility '%s'\n", + filename, linenum, cp ? cp : "<NONE>"); + if (*intptr == -1) + *intptr = (SyslogFacility) value; + break; + + case sLogLevel: + intptr = (int *) &options->log_level; + cp = strtok(NULL, WHITESPACE); + value = log_level_number(cp); + if (value == (LogLevel) - 1) + fatal("%.200s line %d: unsupported log level '%s'\n", + filename, linenum, cp ? cp : "<NONE>"); + if (*intptr == -1) + *intptr = (LogLevel) value; + break; + + case sAllowUsers: + while ((cp = strtok(NULL, WHITESPACE))) { + if (options->num_allow_users >= MAX_ALLOW_USERS) { + fprintf(stderr, "%s line %d: too many allow users.\n", + filename, linenum); + exit(1); + } + options->allow_users[options->num_allow_users++] = xstrdup(cp); + } + break; + + case sDenyUsers: + while ((cp = strtok(NULL, WHITESPACE))) { + if (options->num_deny_users >= MAX_DENY_USERS) { + fprintf(stderr, "%s line %d: too many deny users.\n", + filename, linenum); + exit(1); + } + options->deny_users[options->num_deny_users++] = xstrdup(cp); + } + break; + + case sAllowGroups: + while ((cp = strtok(NULL, WHITESPACE))) { + if (options->num_allow_groups >= MAX_ALLOW_GROUPS) { + fprintf(stderr, "%s line %d: too many allow groups.\n", + filename, linenum); + exit(1); + } + options->allow_groups[options->num_allow_groups++] = xstrdup(cp); + } + break; + + case sDenyGroups: + while ((cp = strtok(NULL, WHITESPACE))) { + if (options->num_deny_groups >= MAX_DENY_GROUPS) { + fprintf(stderr, "%s line %d: too many deny groups.\n", + filename, linenum); + exit(1); + } + options->deny_groups[options->num_deny_groups++] = xstrdup(cp); + } + break; + + default: + fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", + filename, linenum, cp, opcode); + exit(1); + } + if (strtok(NULL, WHITESPACE) != NULL) { + fprintf(stderr, "%s line %d: garbage at end of line.\n", + filename, linenum); + exit(1); + } + } + fclose(f); + if (bad_options > 0) { + fprintf(stderr, "%s: terminating, %d bad configuration options\n", + filename, bad_options); + exit(1); + } +} |
