dump.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <sys/mman.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8 #include <arpa/inet.h> /* ntohl */
   9
  10 #include "regdb.h"
  11
  12 #ifdef USE_OPENSSL
  13 #include <openssl/objects.h>
  14 #include <openssl/bn.h>
  15 #include <openssl/rsa.h>
  16 #include <openssl/sha.h>
  17
  18 #include "keys-ssl.c"
  19 #endif
  20
  21 #ifdef USE_GCRYPT
  22 #include <gcrypt.h>
  23
  24 #include "keys-gcrypt.c"
  25 #endif
  26
  27 static void *get_file_ptr(__u8 *db, int dblen, int structlen, __be32 ptr)
  28 {
  29         __u32 p = ntohl(ptr);
  30
  31         if (p > dblen - structlen) {
  32                 fprintf(stderr, "Invalid database file, bad pointer!\n");
  33                 exit(3);
  34         }
  35
  36         return (void *)(db + p);
  37 }
  38
  39 static void print_reg_rule(__u8 *db, int dblen, __be32 ruleptr)
  40 {
  41         struct regdb_file_reg_rule *rule;
  42         struct regdb_file_freq_range *freq;
  43         struct regdb_file_power_rule *power;
  44         __u32 flags;
  45
  46         rule = get_file_ptr(db, dblen, sizeof(*rule), ruleptr);
  47         freq = get_file_ptr(db, dblen, sizeof(*freq), rule->freq_range_ptr);
  48         power = get_file_ptr(db, dblen, sizeof(*power), rule->power_rule_ptr);
  49
  50         printf("\t(%.3f - %.3f @ %.3f), ",
  51                ((float)ntohl(freq->start_freq))/1000.0,
  52                ((float)ntohl(freq->end_freq))/1000.0,
  53                ((float)ntohl(freq->max_bandwidth))/1000.0);
  54
  55         printf("(");
  56
  57         if (power->max_antenna_gain)
  58                 printf("%.2f, ", ((float)ntohl(power->max_antenna_gain)/100.0));
  59         else
  60                 printf("N/A, ");
  61
  62         if (power->max_eirp)
  63                 printf("%.2f)", ((float)ntohl(power->max_eirp)/100.0));
  64         else
  65                 printf("N/A)");
  66
  67         flags = ntohl(rule->flags);
  68         if (flags & RRF_NO_OFDM)
  69                 printf(", NO-OFDM");
  70         if (flags & RRF_NO_CCK)
  71                 printf(", NO-CCK");
  72         if (flags & RRF_NO_INDOOR)
  73                 printf(", NO-INDOOR");
  74         if (flags & RRF_NO_OUTDOOR)
  75                 printf(", NO-OUTDOOR");
  76         if (flags & RRF_DFS)
  77                 printf(", DFS");
  78         if (flags & RRF_PTP_ONLY)
  79                 printf(", PTP-ONLY");
  80         if (flags & RRF_PTMP_ONLY)
  81                 printf(", PTMP-ONLY");
  82         if (flags & RRF_PASSIVE_SCAN)
  83                 printf(", PASSIVE-SCAN");
  84         if (flags & RRF_NO_IBSS)
  85                 printf(", NO-IBSS");
  86         if (flags & RRF_NO_HT40)
  87                 printf(", NO-HT40");
  88
  89         printf("\n");
  90 }
  91
  92 int main(int argc, char **argv)
  93 {
  94         int fd;
  95         struct stat stat;
  96         __u8 *db;
  97         struct regdb_file_header *header;
  98         struct regdb_file_reg_country *countries;
  99         int dblen, siglen, num_countries, i, j;
 100 #ifdef USE_OPENSSL
 101         RSA *rsa;
 102         __u8 hash[SHA_DIGEST_LENGTH];
 103         int ok = 0;
 104 #endif
 105 #ifdef USE_GCRYPT
 106         gcry_mpi_t mpi_e, mpi_n;
 107         gcry_sexp_t rsa, signature, data;
 108         __u8 hash[20];
 109         int ok = 0;
 110 #endif
 111
 112         if (argc != 2) {
 113                 fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
 114                 return 2;
 115         }
 116
 117         fd = open(argv[1], O_RDONLY);
 118         if (fd < 0) {
 119                 perror("failed to open db file");
 120                 return 2;
 121         }
 122
 123         if (fstat(fd, &stat)) {
 124                 perror("failed to fstat db file");
 125                 return 2;
 126         }
 127
 128         dblen = stat.st_size;
 129
 130         db = mmap(NULL, dblen, PROT_READ, MAP_PRIVATE, fd, 0);
 131         if (db == MAP_FAILED) {
 132                 perror("failed to mmap db file");
 133                 return 2;
 134         }
 135
 136         header = get_file_ptr(db, dblen, sizeof(*header), 0);
 137
 138         if (ntohl(header->magic) != REGDB_MAGIC) {
 139                 fprintf(stderr, "Invalid database magic\n");
 140                 return 2;
 141         }
 142
 143         if (ntohl(header->version) != REGDB_VERSION) {
 144                 fprintf(stderr, "Invalid database version\n");
 145                 return 2;
 146         }
 147
 148         siglen = ntohl(header->signature_length);
 149         /* adjust dblen so later sanity checks don't run into the signature */
 150         dblen -= siglen;
 151
 152         if (dblen <= sizeof(*header)) {
 153                 fprintf(stderr, "Invalid signature length %d\n", siglen);
 154                 return 2;
 155         }
 156
 157         /* verify signature */
 158 #ifdef USE_OPENSSL
 159         rsa = RSA_new();
 160         if (!rsa) {
 161                 fprintf(stderr, "Failed to create RSA key\n");
 162                 return 2;
 163         }
 164
 165         if (SHA1(db, dblen, hash) != hash) {
 166                 fprintf(stderr, "Failed to calculate SHA sum\n");
 167                 return 2;
 168         }
 169
 170         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 171                 rsa->e = &keys[i].e;
 172                 rsa->n = &keys[i].n;
 173
 174                 if (RSA_size(rsa) != siglen)
 175                         continue;
 176
 177                 ok = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
 178                                 db + dblen, siglen, rsa) == 1;
 179                 if (ok)
 180                         break;
 181         }
 182
 183         if (!ok) {
 184                 fprintf(stderr, "Database signature wrong\n");
 185                 return 2;
 186         }
 187
 188         rsa->e = NULL;
 189         rsa->n = NULL;
 190         RSA_free(rsa);
 191
 192         BN_print_fp(stdout, &keys[0].n);
 193
 194         return 0;
 195 #endif
 196
 197 #ifdef USE_GCRYPT
 198         /* hash the db */
 199         gcry_md_hash_buffer(GCRY_MD_SHA1, hash, db, dblen);
 200
 201         if (gcry_sexp_build(&data, NULL, "(data (flags pkcs1) (hash sha1 %b))",
 202                             20, hash)) {
 203                 fprintf(stderr, "failed to build data expression\n");
 204                 return 2;
 205         }
 206
 207         if (gcry_sexp_build(&signature, NULL, "(sig-val (rsa (s %b)))",
 208                             siglen, db + dblen)) {
 209                 fprintf(stderr, "failed to build signature expression\n");
 210                 return 2;
 211         }
 212
 213         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 214                 if (gcry_mpi_scan(&mpi_e, GCRYMPI_FMT_USG,
 215                                   keys[0].e, keys[0].len_e, NULL) ||
 216                     gcry_mpi_scan(&mpi_n, GCRYMPI_FMT_USG,
 217                                   keys[0].n, keys[0].len_n, NULL)) {
 218                         fprintf(stderr, "failed to convert numbers\n");
 219                         return 2;
 220                 }
 221
 222                 if (gcry_sexp_build(&rsa, NULL,
 223                                     "(public-key (rsa (n %m) (e %m)))",
 224                                     mpi_n, mpi_e)) {
 225                         fprintf(stderr, "failed to build rsa key\n");
 226                         return 2;
 227                 }
 228
 229                 if (!gcry_pk_verify(signature, data, rsa)) {
 230                         ok = 1;
 231                         break;
 232                 }
 233         }
 234
 235         if (!ok) {
 236                 fprintf(stderr, "Database signature wrong\n");
 237                 return 2;
 238         }
 239
 240 #endif
 241
 242         num_countries = ntohl(header->reg_country_num);
 243         countries = get_file_ptr(db, dblen,
 244                                  sizeof(struct regdb_file_reg_country) * num_countries,
 245                                  header->reg_country_ptr);
 246
 247         for (i = 0; i < num_countries; i++) {
 248                 struct regdb_file_reg_rules_collection *rcoll;
 249                 struct regdb_file_reg_country *country = countries + i;
 250                 int num_rules;
 251
 252                 printf("country %.2s:\n", country->alpha2);
 253                 rcoll = get_file_ptr(db, dblen, sizeof(*rcoll), country->reg_collection_ptr);
 254                 num_rules = ntohl(rcoll->reg_rule_num);
 255                 /* re-get pointer with sanity checking for num_rules */
 256                 rcoll = get_file_ptr(db, dblen,
 257                                      sizeof(*rcoll) + num_rules * sizeof(__be32),
 258                                      country->reg_collection_ptr);
 259                 for (j = 0; j < num_rules; j++)
 260                         print_reg_rule(db, dblen, rcoll->reg_rule_ptrs[j]);
 261                 printf("\n");
 262         }
 263
 264         return 0;
 265 }