Initial revision

1 files changed, 567 insertions, 0 deletions

diff --git a/servconf.c b/servconf.c
new file mode 100644
index 00000000..5fa48790
--- /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);
+}