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_ir)
  63                 printf("%.2f, ", ((float)ntohl(power->max_ir)/100.0));
  64         else
  65                 printf("N/A, ");
  66
  67         if (power->max_eirp)
  68                 printf("%.2f)", ((float)ntohl(power->max_eirp)/100.0));
  69         else
  70                 printf("N/A)");
  71
  72         flags = ntohl(rule->flags);
  73         if (flags & RRF_NO_OFDM)
  74                 printf(", NO-OFDM");
  75         if (flags & RRF_NO_CCK)
  76                 printf(", NO-CCK");
  77         if (flags & RRF_NO_INDOOR)
  78                 printf(", NO-INDOOR");
  79         if (flags & RRF_NO_OUTDOOR)
  80                 printf(", NO-OUTDOOR");
  81         if (flags & RRF_DFS)
  82                 printf(", DFS");
  83         if (flags & RRF_PTP_ONLY)
  84                 printf(", PTP-ONLY");
  85         if (flags & RRF_PTMP_ONLY)
  86                 printf(", PTMP-ONLY");
  87
  88         printf("\n");
  89 }
  90
  91 int main(int argc, char **argv)
  92 {
  93         int fd;
  94         struct stat stat;
  95         __u8 *db;
  96         struct regdb_file_header *header;
  97         struct regdb_file_reg_country *countries;
  98         int dblen, siglen, num_countries, i, j;
  99 #ifdef USE_OPENSSL
 100         RSA *rsa;
 101         __u8 hash[SHA_DIGEST_LENGTH];
 102         int ok = 0;
 103 #endif
 104 #ifdef USE_GCRYPT
 105         gcry_mpi_t mpi_e, mpi_n;
 106         gcry_sexp_t rsa, signature, data;
 107         __u8 hash[20];
 108         int ok = 0;
 109 #endif
 110
 111         if (argc != 2) {
 112                 fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
 113                 return 2;
 114         }
 115
 116         fd = open(argv[1], O_RDONLY);
 117         if (fd < 0) {
 118                 perror("failed to open db file");
 119                 return 2;
 120         }
 121
 122         if (fstat(fd, &stat)) {
 123                 perror("failed to fstat db file");
 124                 return 2;
 125         }
 126
 127         dblen = stat.st_size;
 128
 129         db = mmap(NULL, dblen, PROT_READ, MAP_PRIVATE, fd, 0);
 130         if (db == MAP_FAILED) {
 131                 perror("failed to mmap db file");
 132                 return 2;
 133         }
 134
 135         header = get_file_ptr(db, dblen, sizeof(*header), 0);
 136
 137         if (ntohl(header->magic) != REGDB_MAGIC) {
 138                 fprintf(stderr, "Invalid database magic\n");
 139                 return 2;
 140         }
 141
 142         if (ntohl(header->version) != REGDB_VERSION) {
 143                 fprintf(stderr, "Invalid database version\n");
 144                 return 2;
 145         }
 146
 147         siglen = ntohl(header->signature_length);
 148         /* adjust dblen so later sanity checks don't run into the signature */
 149         dblen -= siglen;
 150
 151         if (dblen <= sizeof(*header)) {
 152                 fprintf(stderr, "Invalid signature length %d\n", siglen);
 153                 return 2;
 154         }
 155
 156         /* verify signature */
 157 #ifdef USE_OPENSSL
 158         rsa = RSA_new();
 159         if (!rsa) {
 160                 fprintf(stderr, "Failed to create RSA key\n");
 161                 return 2;
 162         }
 163
 164         if (SHA1(db, dblen, hash) != hash) {
 165                 fprintf(stderr, "Failed to calculate SHA sum\n");
 166                 return 2;
 167         }
 168
 169         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 170                 rsa->e = &keys[i].e;
 171                 rsa->n = &keys[i].n;
 172
 173                 if (RSA_size(rsa) != siglen)
 174                         continue;
 175
 176                 ok = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
 177                                 db + dblen, siglen, rsa) == 1;
 178                 if (ok)
 179                         break;
 180         }
 181
 182         if (!ok) {
 183                 fprintf(stderr, "Database signature wrong\n");
 184                 return 2;
 185         }
 186
 187         rsa->e = NULL;
 188         rsa->n = NULL;
 189         RSA_free(rsa);
 190
 191         BN_print_fp(stdout, &keys[0].n);
 192
 193         return 0;
 194 #endif
 195
 196 #ifdef USE_GCRYPT
 197         /* hash the db */
 198         gcry_md_hash_buffer(GCRY_MD_SHA1, hash, db, dblen);
 199
 200         if (gcry_sexp_build(&data, NULL, "(data (flags pkcs1) (hash sha1 %b))",
 201                             20, hash)) {
 202                 fprintf(stderr, "failed to build data expression\n");
 203                 return 2;
 204         }
 205
 206         if (gcry_sexp_build(&signature, NULL, "(sig-val (rsa (s %b)))",
 207                             siglen, db + dblen)) {
 208                 fprintf(stderr, "failed to build signature expression\n");
 209                 return 2;
 210         }
 211
 212         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 213                 if (gcry_mpi_scan(&mpi_e, GCRYMPI_FMT_USG,
 214                                   keys[0].e, keys[0].len_e, NULL) ||
 215                     gcry_mpi_scan(&mpi_n, GCRYMPI_FMT_USG,
 216                                   keys[0].n, keys[0].len_n, NULL)) {
 217                         fprintf(stderr, "failed to convert numbers\n");
 218                         return 2;
 219                 }
 220
 221                 if (gcry_sexp_build(&rsa, NULL,
 222                                     "(public-key (rsa (n %m) (e %m)))",
 223                                     mpi_n, mpi_e)) {
 224                         fprintf(stderr, "failed to build rsa key\n");
 225                         return 2;
 226                 }
 227
 228                 if (!gcry_pk_verify(signature, data, rsa)) {
 229                         ok = 1;
 230                         break;
 231                 }
 232         }
 233
 234         if (!ok) {
 235                 fprintf(stderr, "Database signature wrong\n");
 236                 return 2;
 237         }
 238
 239 #endif
 240
 241         num_countries = ntohl(header->reg_country_num);
 242         countries = get_file_ptr(db, dblen,
 243                                  sizeof(struct regdb_file_reg_country) * num_countries,
 244                                  header->reg_country_ptr);
 245
 246         for (i = 0; i < num_countries; i++) {
 247                 struct regdb_file_reg_rules_collection *rcoll;
 248                 struct regdb_file_reg_country *country = countries + i;
 249                 int num_rules;
 250
 251                 printf("country %.2s:\n", country->alpha2);
 252                 rcoll = get_file_ptr(db, dblen, sizeof(*rcoll), country->reg_collection_ptr);
 253                 num_rules = ntohl(rcoll->reg_rule_num);
 254                 /* re-get pointer with sanity checking for num_rules */
 255                 rcoll = get_file_ptr(db, dblen,
 256                                      sizeof(*rcoll) + num_rules * sizeof(__be32),
 257                                      country->reg_collection_ptr);
 258                 for (j = 0; j < num_rules; j++)
 259                         print_reg_rule(db, dblen, rcoll->reg_rule_ptrs[j]);
 260                 printf("\n");
 261         }
 262
 263         return 0;
 264 }