ucert.c

   1 /*
   2  * Copyright (C) 2018 Daniel Golle <daniel@makrotopia.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 3
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #define _GNU_SOURCE
  15
  16 #include <fcntl.h>
  17 #include <dlfcn.h>
  18 #include <stdio.h>
  19 #include <stdbool.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <getopt.h>
  23 #include <stdint.h>
  24 #include <unistd.h>
  25 #include <inttypes.h>
  26 #include <sys/stat.h>
  27 #include <sys/wait.h>
  28
  29 #include <json-c/json.h>
  30 #include <libubox/blob.h>
  31 #include <libubox/list.h>
  32 #include <libubox/vlist.h>
  33 #include <libubox/blobmsg_json.h>
  34
  35 static enum {
  36         CMD_APPEND,
  37         CMD_DUMP,
  38         CMD_ISSUE,
  39         CMD_REVOKE,
  40         CMD_VERIFY,
  41         CMD_NONE,
  42 } cmd = CMD_NONE;
  43
  44 static bool quiet;
  45
  46 enum cert_attr {
  47         CERT_ATTR_SIGNATURE,
  48         CERT_ATTR_PAYLOAD,
  49         CERT_ATTR_MAX
  50 };
  51
  52 static const struct blob_attr_info cert_policy[CERT_ATTR_MAX] = {
  53         [CERT_ATTR_SIGNATURE] = { .type = BLOB_ATTR_BINARY },
  54         [CERT_ATTR_PAYLOAD] = { .type = BLOB_ATTR_NESTED },
  55 };
  56
  57 enum cert_payload_attr {
  58         CERT_PL_ATTR_CERTTYPE,
  59         CERT_PL_ATTR_CERTID,
  60         CERT_PL_ATTR_PUBKEY,
  61         CERT_PL_ATTR_KEY_FINGERPRINT,
  62         CERT_PL_ATTR_MAX
  63 };
  64
  65 enum certtype_id {
  66         CERTTYPE_AUTH,
  67         CERTTYPE_REVOKE
  68 };
  69
  70 static const struct blobmsg_policy cert_payload_policy[CERT_PL_ATTR_MAX] = {
  71         [CERT_PL_ATTR_CERTTYPE] = { .type = BLOBMSG_TYPE_INT8 },
  72         [CERT_PL_ATTR_CERTID] = { .type = BLOBMSG_TYPE_INT64 },
  73         [CERT_PL_ATTR_PUBKEY] = { .type = BLOBMSG_TYPE_STRING },
  74         [CERT_PL_ATTR_KEY_FINGERPRINT] = { .type = BLOBMSG_TYPE_STRING },
  75 };
  76
  77 static int cert_append(const char *certfile, const char *pubkeyfile, const char *sigfile) {
  78         fprintf(stderr, "not implemented\n");
  79         return 1;
  80 }
  81
  82 static int cert_dump(const char *certfile) {
  83         fprintf(stderr, "not implemented\n");
  84         return 1;
  85 }
  86
  87 static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) {
  88         fprintf(stderr, "not implemented\n");
  89         return 1;
  90 }
  91
  92 static int cert_process_revoker(const char *certfile) {
  93         fprintf(stderr, "not implemented\n");
  94         return 1;
  95 }
  96
  97 static int cert_verify(const char *certfile, const char *pubkeyfile, const char *pubkeydir, const char *msgfile) {
  98         fprintf(stderr, "not implemented\n");
  99         return 1;
 100 }
 101
 102 static int usage(const char *cmd)
 103 {
 104         fprintf(stderr,
 105                 "Usage: %s <command> <options>\n"
 106                 "Commands:\n"
 107                 "  -A:                  append (needs -c and -p and/or -x)\n"
 108                 "  -D:                  dump\n"
 109                 "  -I:                  issue cert and revoker (needs -c and -p and -s)\n"
 110                 "  -R:                  process revoker certificate (needs -c)\n"
 111                 "  -V:                  verify (needs -c and -p|-P)\n"
 112                 "Options:\n"
 113                 "  -c <file>:           certificate file\n"
 114                 "  -m <file>:           message file (verify only)\n"
 115                 "  -p <file>:           public key file\n"
 116                 "  -P <path>:           public key directory (verify only)\n"
 117                 "  -q:                  quiet (do not print verification result, use return code only)\n"
 118                 "  -s <file>:           secret key file (issue only)\n"
 119                 "  -x <file>:           signature file\n"
 120                 "\n",
 121                 cmd);
 122         return 1;
 123 }
 124
 125 int main(int argc, char *argv[]) {
 126         int ch;
 127         const char *msgfile = NULL;
 128         const char *sigfile = NULL;
 129         const char *pubkeyfile = NULL;
 130         const char *pubkeydir = NULL;
 131         const char *certfile = NULL;
 132         const char *seckeyfile = NULL;
 133
 134         quiet = false;
 135         while ((ch = getopt(argc, argv, "ADIRVc:m:p:P:qs:x:")) != -1) {
 136                 switch (ch) {
 137                 case 'A':
 138                         cmd = CMD_APPEND;
 139                         break;
 140                 case 'D':
 141                         cmd = CMD_DUMP;
 142                         break;
 143                 case 'I':
 144                         cmd = CMD_ISSUE;
 145                         break;
 146                 case 'R':
 147                         cmd = CMD_REVOKE;
 148                         break;
 149                 case 'V':
 150                         cmd = CMD_VERIFY;
 151                         break;
 152                 case 'c':
 153                         certfile = optarg;
 154                         break;
 155                 case 'm':
 156                         msgfile = optarg;
 157                         break;
 158                 case 'p':
 159                         pubkeyfile = optarg;
 160                         break;
 161                 case 'P':
 162                         pubkeydir = optarg;
 163                         break;
 164                 case 's':
 165                         seckeyfile = optarg;
 166                         break;
 167                 case 'q':
 168                         quiet = true;
 169                         break;
 170                 case 'x':
 171                         sigfile = optarg;
 172                         break;
 173                 default:
 174                         return usage(argv[0]);
 175                 }
 176         }
 177
 178         switch (cmd) {
 179         case CMD_APPEND:
 180                 if (certfile && (pubkeyfile || sigfile))
 181                         return cert_append(certfile, pubkeyfile, sigfile);
 182                 else
 183                         return usage(argv[0]);
 184         case CMD_DUMP:
 185                 if (certfile)
 186                         return cert_dump(certfile);
 187                 else
 188                         return usage(argv[0]);
 189         case CMD_ISSUE:
 190                 if (certfile && pubkeyfile && seckeyfile)
 191                         return cert_issue(certfile, pubkeyfile, seckeyfile);
 192                 else
 193                         return usage(argv[0]);
 194         case CMD_REVOKE:
 195                 if (certfile)
 196                         return cert_process_revoker(certfile);
 197                 else
 198                         return usage(argv[0]);
 199         case CMD_VERIFY:
 200                 if (certfile && (pubkeyfile || pubkeydir))
 201                         return cert_verify(certfile, pubkeyfile, pubkeydir, msgfile);
 202                 else
 203                         return usage(argv[0]);
 204         case CMD_NONE:
 205                 return usage(argv[0]);
 206         }
 207
 208         /* unreachable */
 209         return usage(argv[0]);
 210 }