pki: Add a --cga command to generate CGA parameters for a public key and prefix

diff --git a/src/pki/Makefile.am b/src/pki/Makefile.am
index ab407e0212080994051af9aa31edf16fc07bc71c..cb6d9fa7dcc531c0c36247705d341984594ecd73 100644 (file)
--- a/src/pki/Makefile.am
+++ b/src/pki/Makefile.am
@@ -14,6 +14,7 @@ pki_SOURCES = pki.c pki.h command.c command.h \
        commands/acert.c \
        commands/pkcs7.c \
        commands/pkcs12.c \
+       commands/cga.c \
        commands/verify.c
 
 pki_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la

diff --git a/src/pki/command.h b/src/pki/command.h
index d49adda0995a07e070b9c48ffa7359652628183f..e55c579e4606c83b7ff81fe740cd4421f78ac1b1 100644 (file)
--- a/src/pki/command.h
+++ b/src/pki/command.h
@@ -24,7 +24,7 @@
 /**
  * Maximum number of commands (+1).
  */
-#define MAX_COMMANDS 13
+#define MAX_COMMANDS 14
 
 /**
  * Maximum number of options in a command (+3)

diff --git a/src/pki/commands/cga.c b/src/pki/commands/cga.c
new file mode 100644 (file)
index 0000000..809ff16
--- /dev/null
+++ b/src/pki/commands/cga.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2015 Martin Willi
+ * Copyright (C) 2015 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <errno.h>
+
+#include "pki.h"
+
+#include <utils/debug.h>
+#include <credentials/certificates/certificate.h>
+
+/**
+ * Make a 8-byte /64 prefix from a given IPv6 address string
+ */
+static bool make_prefix(char *str, chunk_t *prefix)
+{
+       host_t *host;
+       chunk_t enc;
+       char zero[8] = {};
+
+       host = host_create_from_string(str, 0);
+       if (!host)
+       {
+               return FALSE;
+       }
+       if (host->get_family(host) != AF_INET6)
+       {
+               host->destroy(host);
+               return FALSE;
+       }
+       enc = host->get_address(host);
+       if (enc.len != 16 || !memeq(enc.ptr + 8, zero, 8))
+       {
+               host->destroy(host);
+               return FALSE;
+       }
+       *prefix = chunk_clone(chunk_create(enc.ptr, 8));
+       host->destroy(host);
+       return TRUE;
+}
+
+/**
+ * Generate a CGA and parameters
+ */
+static int cga()
+{
+       certificate_t *cert = NULL;
+       public_key_t *public = NULL;
+       char *file = NULL, *error = NULL, *arg;
+       chunk_t prefix = chunk_empty, encoding = chunk_empty, chunk;
+       int sec = 0;
+
+       while (TRUE)
+       {
+               switch (command_getopt(&arg))
+               {
+                       case 'h':
+                               goto usage;
+                       case 'i':
+                               file = arg;
+                               continue;
+                       case 's':
+                               sec = atoi(arg);
+                               continue;
+                       case 'p':
+                               if (!make_prefix(arg, &prefix))
+                               {
+                                       error = "invalid --prefix";
+                                       goto usage;
+                               }
+                               continue;
+                       case EOF:
+                               break;
+                       default:
+                               error = "invalid --cga option";
+                               goto usage;
+               }
+               break;
+       }
+
+       if (!prefix.len)
+       {
+               error = "--prefix is required";
+               goto usage;
+       }
+
+       DBG2(DBG_LIB, "Reading public key:");
+       if (file)
+       {
+               public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ANY,
+                                                                       BUILD_FROM_FILE, file, BUILD_END);
+       }
+       else
+       {
+               if (!chunk_from_fd(0, &chunk))
+               {
+                       fprintf(stderr, "%s: ", strerror(errno));
+                       error = "reading public key failed";
+                       goto end;
+               }
+               public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ANY,
+                                                                        BUILD_BLOB, chunk, BUILD_END);
+               free(chunk.ptr);
+       }
+
+       if (!public)
+       {
+               error = "parsing public key failed";
+               goto end;
+       }
+
+       cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_CGA_PARAMS,
+                                                         BUILD_PUBLIC_KEY, public, BUILD_CGA_SEC, sec,
+                                                         BUILD_CGA_PREFIX, prefix, BUILD_END);
+       if (!cert)
+       {
+               error = "generating CGA parameters failed";
+               goto end;
+       }
+       if (!cert->get_encoding(cert, CERT_CGA_ENCODING, &encoding))
+       {
+               error = "encoding CGA parameters failed";
+               goto end;
+       }
+       set_file_mode(stdout, CERT_CGA_ENCODING);
+       if (fwrite(encoding.ptr, encoding.len, 1, stdout) != 1)
+       {
+               error = "writing CGA parameters key failed";
+               goto end;
+       }
+       fprintf(stderr, "%Y\n", cert->get_subject(cert));
+
+end:
+       DESTROY_IF(cert);
+       DESTROY_IF(public);
+       free(encoding.ptr);
+       free(prefix.ptr);
+
+       if (error)
+       {
+               fprintf(stderr, "%s\n", error);
+               return 1;
+       }
+       return 0;
+
+usage:
+       free(prefix.ptr);
+       return command_usage(error);
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+       command_register((command_t) {
+               cga, '6', "cga",
+               "generate an IPv6 CGA for a public key and prefix",
+               {"[--in file] --prefix prefix [--sec Sec]"},
+               {
+                       {"help",                        'h', 0, "show usage information"},
+                       {"in",                          'i', 1, "public key to generate CGA for, default: stdin"},
+                       {"prefix",                      'p', 1, "CGA /64 address prefix as IPv6 address"},
+                       {"sec",                         's', 1, "CGA Sec brute force difficulty, 0-7"},
+               }
+       });
+}