Initial import of isakmpd, an IKE (ISAKMP/Oakley) implementation for the

OpenBSD IPSEC stack by me, Niklas Hallqvist and Niels Provos, funded by
Ericsson Radio Systems.  It is not yet complete or usable in a real scenario
but the missing pieces will soon be there.  The early commit is for people
who wants early access and who are not afraid of looking at source.
isakmpd interops with Cisco, Timestep, SSH & Pluto (Linux FreeS/WAN) so
far, so it is not that incomplete.  It is really mostly configuration that
is lacking.

1 files changed, 426 insertions, 0 deletions

diff --git a/sbin/isakmpd/conf.c b/sbin/isakmpd/conf.c
new file mode 100644
index 00000000000..a05a9f9ec3b
--- /dev/null
+++ b/sbin/isakmpd/conf.c
@@ -0,0 +1,426 @@
+/*	$Id: conf.c,v 1.1 1998/11/15 00:03:48 niklas Exp $	*/
+
+/*
+ * Copyright (c) 1998 Niklas Hallqvist.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Ericsson Radio Systems.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This code was written under funding by Ericsson Radio Systems.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "conf.h"
+#include "log.h"
+
+/*
+ * Radix-64 Encoding.
+ */
+
+const u_int8_t bin2asc[] =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+const u_int8_t asc2bin[] =
+{
+  255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255,  62, 255, 255, 255,  63,
+   52,  53,  54,  55,  56,  57,  58,  59,
+   60,  61, 255, 255, 255, 255, 255, 255,
+  255,   0,   1,   2,   3,   4,   5,   6,
+    7,   8,   9,  10,  11,  12,  13,  14,
+   15,  16,  17,  18,  19,  20,  21,  22,
+   23,  24,  25, 255, 255, 255, 255, 255,
+  255,  26,  27,  28,  29,  30,  31,  32,
+   33,  34,  35,  36,  37,  38,  39,  40,
+   41,  42,  43,  44,  45,  46,  47,  48,
+   49,  50,  51, 255, 255, 255, 255, 255
+};
+
+struct conf_binding {
+  LIST_ENTRY (conf_binding) link;
+  char *section;
+  char *tag;
+  char *value;
+};
+
+char *conf_path = CONFIG_FILE;
+LIST_HEAD (conf_bindings, conf_binding) conf_bindings;
+
+static off_t conf_sz;
+static char *conf_addr;
+
+/*
+ * Insert a tag-value combination from LINE (the equal sign is at POS)
+ * into SECTION of our configuration database.
+ * XXX Should really be a hash table implementation.
+ */
+static void
+conf_set (char *section, char *line, int pos)
+{
+  struct conf_binding *node;
+  int i;
+
+  node = malloc (sizeof *node);
+  if (!node)
+    log_fatal ("conf_set: out of memory");
+  node->section = section;
+  node->tag = line;
+  for (i = 0; line[i] && i < pos; i++)
+    ;
+  line[i] = '\0';
+  if (conf_get_str (section, line))
+    {
+      log_print ("conf_set: duplicate tag [%s]:%s, ignoring...\n", section,
+		 line);
+      return;
+    }
+  node->value = line + pos + 1 + strspn (line + pos + 1, " \t");
+  LIST_INSERT_HEAD (&conf_bindings, node, link);
+  log_debug (LOG_MISC, 70, "(%s,%s)->%s", node->section, node->tag,
+	     node->value);
+}
+
+/*
+ * Parse the line LINE of SZ bytes.  Skip Comments, recognize section
+ * headers and feed tag-value pairs into our configuration database.
+ */
+static void
+conf_parse_line (char *line, size_t sz)
+{
+  char *cp = line;
+  int i;
+  static char *section = 0;
+  static int ln = 0;
+
+  ln++;
+  for (i = 0; line[i]; i++)
+    if (!isprint (*cp))
+      {
+	log_print ("conf_parse_line: %d:"
+		   "ignoring line %d with non-printable characters", ln);
+	return;
+      }
+
+  /* Lines starting with '#' or ';' are comments.  */
+  if (*line == '#' || *line == ';')
+    return;
+
+  /* '[section]' parsing...  */
+  if (*line == '[')
+    {
+      for (i = 1; i < sz; i++)
+	if (line[i] == ']')
+	  break;
+      if (i == sz)
+	{
+	  log_print ("conf_parse_line: %d:"
+		     "non-matched ']', ignoring until next section", ln);
+	  section = 0;
+	  return;
+	}
+      section = malloc (i);
+      strncpy (section, line + 1, i - 1);
+      section[i - 1] = '\0';
+      return;
+    }
+
+  /* Deal with assignments.  */
+  for (i = 0; i < sz; i++)
+    if (cp[i] == '=')
+      {
+	/* If no section, we are ignoring the lines.  */
+	if (!section)
+	  {
+	    log_print ("conf_parse_line: %d: ignoring line due to no section",
+		       ln);
+	    return;
+	  }
+	conf_set (section, line, i);
+	return;
+      }
+
+  /* Other non-empty lines are wierd.  */
+  i = strspn (line, " \t");
+  if (line[i])
+    log_print ("conf_parse_line: %d: syntax error", ln);
+
+  return;
+}
+
+/* Parse the mapped configuration file.  */
+static void
+conf_parse (void)
+{
+  char *cp = conf_addr;
+  char *conf_end = conf_addr + conf_sz;
+  char *line;
+
+  line = cp;
+  while (cp < conf_end)
+    {
+      if (*cp == '\n')
+	{
+	  /* Check for escaped newlines.  */
+	  if (cp > conf_addr && *(cp - 1) == '\\')
+	    *(cp - 1) = *cp = ' ';
+	  else
+	    {
+	      *cp = '\0';
+	      conf_parse_line (line, cp - line);
+	      line = cp + 1;
+	    }
+	}
+      cp++;
+    }
+  if (cp != line)
+    log_print ("conf_parse: last line non-terminated, ignored.");
+}
+
+/* Open the config file and map it into our address space, then parse it.  */
+void
+conf_init (void)
+{
+  int fd;
+  struct stat st;
+
+  /*
+   * Start by freeing potential existing configuration.
+   *
+   * XXX One could envision doing this late, surviving failures with just
+   * a warning log message that the new configuration did not get read
+   * and that the former one persists.
+   */
+  if (conf_addr)
+    {
+      while (LIST_FIRST (&conf_bindings))
+	LIST_REMOVE (LIST_FIRST (&conf_bindings), link);
+      free (conf_addr);
+    }
+
+  fd = open (conf_path, O_RDONLY);
+  if (fd == -1)
+    log_fatal ("open (\"%s\", O_RDONLY)", conf_path);
+  if (fstat (fd, &st) == -1)
+    log_fatal ("fstat (%d, &st)", fd);
+  conf_sz = st.st_size;
+  conf_addr = malloc (conf_sz);
+  if (!conf_addr)
+    log_fatal ("malloc (%d)", conf_sz);
+  /* XXX I assume short reads won't happen here.  */
+  if (read (fd, conf_addr, conf_sz) != conf_sz)
+    log_fatal ("read (%d, %p, %d)", fd, conf_addr, conf_sz);
+  close (fd);
+
+  LIST_INIT (&conf_bindings);
+  conf_parse ();
+}
+
+/* Return the numeric value denoted by TAG in section SECTION.  */
+int
+conf_get_num (char *section, char *tag)
+{
+  char *value = conf_get_str (section, tag);
+
+  if (value)
+      return atoi (value);
+  return 0;
+}
+
+/* Return the string value denoted by TAG in section SECTION.  */
+char *
+conf_get_str (char *section, char *tag)
+{
+  struct conf_binding *cb;
+
+  for (cb = LIST_FIRST (&conf_bindings); cb; cb = LIST_NEXT (cb, link))
+    if (strcasecmp (section, cb->section) == 0
+	&& strcasecmp (tag, cb->tag) == 0)
+      {
+	log_debug (LOG_MISC, 60, "conf_get_str: (%s, %s) -> %s", section,
+		   tag, cb->value);
+	return cb->value;
+      }
+  log_debug (LOG_MISC, 60,
+	     "conf_get_str: configuration value not found (%s, %s)", section,
+	     tag);
+  return 0;
+}
+
+struct conf_list *
+conf_get_list (char *section, char *tag)
+{
+  char *liststr = 0, *p, *field;
+  struct conf_list *list = 0;
+  struct conf_list_node *node;
+
+  list = malloc (sizeof *list);
+  if (!list)
+    goto cleanup;
+  TAILQ_INIT (&list->fields);
+  list->cnt = 0;
+  liststr = conf_get_str (section, tag);
+  if (!liststr)
+    goto cleanup;
+  liststr = strdup (liststr);
+  if (!liststr)
+    goto cleanup;
+  p = liststr;
+  while ((field = strsep (&p, ", \t")) != NULL)
+    {
+      if (*field == '\0')
+	{
+	  log_print ("conf_get_list: empty field, ignoring...");
+	  continue;
+	}
+      list->cnt++;
+      node = malloc (sizeof *node);
+      if (!node)
+	goto cleanup;
+      node->field = field;
+      TAILQ_INSERT_TAIL (&list->fields, node, link);
+    }
+  return list;
+
+ cleanup:
+  if (list)
+    conf_free_list (list);
+  if (liststr)
+    free (liststr);
+  return 0;
+}
+
+/* Decode a PEM encoded buffer.  */ 
+int
+conf_decode_base64(u_int8_t *out, u_int32_t *len, u_char *buf)
+{
+  u_int32_t c = 0;
+  u_int8_t c1, c2, c3, c4;
+
+  while (*buf)
+    {
+      if (*buf > 127 || (c1 = asc2bin[*buf]) == 255)
+	return 0;
+      buf++;
+
+      if (*buf > 127 || (c2 = asc2bin[*buf]) == 255)
+	return 0;
+      buf++;
+
+      if (*buf == '=')
+	{
+	  c3 = c4 = 0;
+	  c++;
+
+	  /* Check last four bit */
+	  if (c2 & 0xF)
+	    return 0;
+
+	  if (!strcmp (buf, "=="))
+	    buf++;
+	  else
+	    return 0;
+	}
+      else if (*buf > 127 || (c3 = asc2bin[*buf]) == 255)
+	return 0;
+      else
+	{
+	  if (*++buf == '=')
+	    {
+	      c4 = 0;
+	      c += 2;
+	      
+	      /* Check last two bit */
+	      if (c3 & 3)
+		return 0;
+
+	      if (strcmp(buf, "="))
+		return 0;
+
+	    } 
+	  else if (*buf > 127 || (c4 = asc2bin[*buf]) == 255)
+	      return 0;
+	  else 
+	      c += 3;
+	}
+
+      buf++;
+      *out++ = (c1 << 2) | (c2 >> 4);
+      *out++ = (c2 << 4) | (c3 >> 2);
+      *out++ = (c3 << 6) | c4;
+    }
+
+  *len = c;
+  return 1;
+
+}
+
+/* Read a line from a stream to the buffer.  */
+int
+conf_get_line (FILE *stream, char *buf, u_int32_t len)
+{
+  char c;
+
+  while (len-- > 1)
+    {
+      c = fgetc (stream);
+      if (c == '\n')
+	{
+	  *buf = 0;
+	  return 1;
+	}
+      else if (c == EOF)
+	break;
+
+      *buf++ = c;
+    }
+
+  *buf = 0;
+  return 0;
+}
+
+void
+conf_free_list (struct conf_list *list)
+{
+  while (TAILQ_FIRST (&list->fields))
+    TAILQ_REMOVE (&list->fields, TAILQ_FIRST (&list->fields), link);
+  free (list);
+}