Initial revision
diff --git a/servconf.c b/servconf.c
new file mode 100644
index 0000000..5fa4879
--- /dev/null
+++ b/servconf.c
@@ -0,0 +1,567 @@
+/*
+
+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 1.1 1999/10/27 03:42:45 damien Exp $");
+
+#include "ssh.h"
+#include "servconf.h"
+#include "xmalloc.h"
+
+/* Initializes the server options to their default values. */
+
+void initialize_server_options(ServerOptions *options)
+{
+ memset(options, 0, sizeof(*options));
+ options->port = -1;
+ options->listen_addr.s_addr = htonl(INADDR_ANY);
+ 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->quiet_mode = -1;
+ options->fascist_logging = -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->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->port == -1)
+ {
+ struct servent *sp;
+
+ sp = getservbyname(SSH_SERVICE_NAME, "tcp");
+ if (sp)
+ options->port = ntohs(sp->s_port);
+ else
+ options->port = SSH_DEFAULT_PORT;
+ endservent();
+ }
+ 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->quiet_mode == -1)
+ options->quiet_mode = 0;
+ if (options->check_mail == -1)
+ options->check_mail = 0;
+ if (options->fascist_logging == -1)
+ options->fascist_logging = 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 = 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->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
+{
+ sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
+ sPermitRootLogin, sQuietMode, sFascistLogging, sLogFacility,
+ 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
+
+} 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 },
+ { "quietmode", sQuietMode },
+ { "fascistlogging", sFascistLogging },
+ { "syslogfacility", sLogFacility },
+ { "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 },
+ { "x11forwarding", sX11Forwarding },
+ { "x11displayoffset", sX11DisplayOffset },
+ { "strictmodes", sStrictModes },
+ { "permitemptypasswords", sEmptyPasswd },
+ { "uselogin", sUseLogin },
+ { "randomseed", sRandomSeedFile },
+ { "keepalive", sKeepAlives },
+ { "allowusers", sAllowUsers },
+ { "denyusers", sDenyUsers },
+ { "allowgroups", sAllowGroups },
+ { "denygroups", sDenyGroups },
+ { NULL, 0 }
+};
+
+static struct
+{
+ const char *name;
+ SyslogFacility facility;
+} log_facilities[] =
+{
+ { "DAEMON", SYSLOG_FACILITY_DAEMON },
+ { "USER", SYSLOG_FACILITY_USER },
+ { "AUTH", SYSLOG_FACILITY_AUTH },
+ { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
+ { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
+ { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
+ { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
+ { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
+ { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
+ { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
+ { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
+ { 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 (strcmp(cp, keywords[i].name) == 0)
+ return keywords[i].opcode;
+
+ fprintf(stderr, "%s line %d: Bad configuration option: %s\n",
+ filename, linenum, cp);
+ exit(1);
+}
+
+/* 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, i, value;
+ 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);
+ {
+ char *t = cp;
+ for (; *t != 0; t++)
+ if ('A' <= *t && *t <= 'Z')
+ *t = *t - 'A' + 'a'; /* tolower */
+
+ }
+ opcode = parse_token(cp, filename, linenum);
+ switch (opcode)
+ {
+ case sPort:
+ intptr = &options->port;
+ 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 sServerKeyBits:
+ intptr = &options->server_key_bits;
+ goto parse_int;
+
+ 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)
+ {
+ fprintf(stderr, "%s line %d: missing inet addr.\n",
+ filename, linenum);
+ exit(1);
+ }
+ options->listen_addr.s_addr = inet_addr(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 sQuietMode:
+ intptr = &options->quiet_mode;
+ goto parse_flag;
+
+ case sFascistLogging:
+ intptr = &options->fascist_logging;
+ 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;
+
+#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:
+ cp = strtok(NULL, WHITESPACE);
+ if (!cp)
+ {
+ fprintf(stderr, "%s line %d: missing facility name.\n",
+ filename, linenum);
+ exit(1);
+ }
+ for (i = 0; log_facilities[i].name; i++)
+ if (strcmp(log_facilities[i].name, cp) == 0)
+ break;
+ if (!log_facilities[i].name)
+ {
+ fprintf(stderr, "%s line %d: unsupported log facility %s\n",
+ filename, linenum, cp);
+ exit(1);
+ }
+ if (options->log_facility == (SyslogFacility)(-1))
+ options->log_facility = log_facilities[i].facility;
+ 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);
+}