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("(%.3f, %.3f, %.3f)",
  56                ((float)ntohl(power->max_antenna_gain)/100.0),
  57                ((float)ntohl(power->max_ir)/100.0),
  58                ((float)ntohl(power->max_eirp)/100.0));
  59
  60         flags = ntohl(rule->flags);
  61         if (flags & RRF_NO_OFDM)
  62                 printf(", NO-OFDM");
  63         if (flags & RRF_NO_CCK)
  64                 printf(", NO-CCK");
  65         if (flags & RRF_NO_INDOOR)
  66                 printf(", NO-INDOOR");
  67         if (flags & RRF_NO_OUTDOOR)
  68                 printf(", NO-OUTDOOR");
  69         if (flags & RRF_DFS)
  70                 printf(", DFS");
  71         if (flags & RRF_PTP_ONLY)
  72                 printf(", PTP-ONLY");
  73         if (flags & RRF_PTMP_ONLY)
  74                 printf(", PTMP-ONLY");
  75
  76         printf("\n");
  77 }
  78
  79 int main(int argc, char **argv)
  80 {
  81         int fd;
  82         struct stat stat;
  83         __u8 *db;
  84         struct regdb_file_header *header;
  85         struct regdb_file_reg_country *countries;
  86         int dblen, siglen, num_countries, i, j;
  87 #ifdef USE_OPENSSL
  88         RSA *rsa;
  89         __u8 hash[SHA_DIGEST_LENGTH];
  90         int ok = 0;
  91 #endif
  92 #ifdef USE_GCRYPT
  93         gcry_mpi_t mpi_e, mpi_n;
  94         gcry_sexp_t rsa, signature, data;
  95         __u8 hash[20];
  96         int ok = 0;
  97 #endif
  98
  99         if (argc != 2) {
 100                 fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
 101                 return 2;
 102         }
 103
 104         fd = open(argv[1], O_RDONLY);
 105         if (fd < 0) {
 106                 perror("failed to open db file");
 107                 return 2;
 108         }
 109
 110         if (fstat(fd, &stat)) {
 111                 perror("failed to fstat db file");
 112                 return 2;
 113         }
 114
 115         dblen = stat.st_size;
 116
 117         db = mmap(NULL, dblen, PROT_READ, MAP_PRIVATE, fd, 0);
 118         if (db == MAP_FAILED) {
 119                 perror("failed to mmap db file");
 120                 return 2;
 121         }
 122
 123         header = get_file_ptr(db, dblen, sizeof(*header), 0);
 124
 125         if (ntohl(header->magic) != REGDB_MAGIC) {
 126                 fprintf(stderr, "Invalid database magic\n");
 127                 return 2;
 128         }
 129
 130         if (ntohl(header->version) != REGDB_VERSION) {
 131                 fprintf(stderr, "Invalid database version\n");
 132                 return 2;
 133         }
 134
 135         siglen = ntohl(header->signature_length);
 136         /* adjust dblen so later sanity checks don't run into the signature */
 137         dblen -= siglen;
 138
 139         if (dblen <= sizeof(*header)) {
 140                 fprintf(stderr, "Invalid signature length %d\n", siglen);
 141                 return 2;
 142         }
 143
 144         /* verify signature */
 145 #ifdef USE_OPENSSL
 146         rsa = RSA_new();
 147         if (!rsa) {
 148                 fprintf(stderr, "Failed to create RSA key\n");
 149                 return 2;
 150         }
 151
 152         if (SHA1(db, dblen, hash) != hash) {
 153                 fprintf(stderr, "Failed to calculate SHA sum\n");
 154                 return 2;
 155         }
 156
 157         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 158                 rsa->e = &keys[i].e;
 159                 rsa->n = &keys[i].n;
 160
 161                 if (RSA_size(rsa) != siglen)
 162                         continue;
 163
 164                 ok = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
 165                                 db + dblen, siglen, rsa) == 1;
 166                 if (ok)
 167                         break;
 168         }
 169
 170         if (!ok) {
 171                 fprintf(stderr, "Database signature wrong\n");
 172                 return 2;
 173         }
 174
 175         rsa->e = NULL;
 176         rsa->n = NULL;
 177         RSA_free(rsa);
 178
 179         BN_print_fp(stdout, &keys[0].n);
 180
 181         return 0;
 182 #endif
 183
 184 #ifdef USE_GCRYPT
 185         /* hash the db */
 186         gcry_md_hash_buffer(GCRY_MD_SHA1, hash, db, dblen);
 187
 188         if (gcry_sexp_build(&data, NULL, "(data (flags pkcs1) (hash sha1 %b))",
 189                             20, hash)) {
 190                 fprintf(stderr, "failed to build data expression\n");
 191                 return 2;
 192         }
 193
 194         if (gcry_sexp_build(&signature, NULL, "(sig-val (rsa (s %b)))",
 195                             siglen, db + dblen)) {
 196                 fprintf(stderr, "failed to build signature expression\n");
 197                 return 2;
 198         }
 199
 200         for (i = 0; i < sizeof(keys)/sizeof(keys[0]); i++) {
 201                 if (gcry_mpi_scan(&mpi_e, GCRYMPI_FMT_USG,
 202                                   keys[0].e, keys[0].len_e, NULL) ||
 203                     gcry_mpi_scan(&mpi_n, GCRYMPI_FMT_USG,
 204                                   keys[0].n, keys[0].len_n, NULL)) {
 205                         fprintf(stderr, "failed to convert numbers\n");
 206                         return 2;
 207                 }
 208
 209                 if (gcry_sexp_build(&rsa, NULL,
 210                                     "(public-key (rsa (n %m) (e %m)))",
 211                                     mpi_n, mpi_e)) {
 212                         fprintf(stderr, "failed to build rsa key\n");
 213                         return 2;
 214                 }
 215
 216                 if (!gcry_pk_verify(signature, data, rsa)) {
 217                         ok = 1;
 218                         break;
 219                 }
 220         }
 221
 222         if (!ok) {
 223                 fprintf(stderr, "Database signature wrong\n");
 224                 return 2;
 225         }
 226
 227 #endif
 228
 229         num_countries = ntohl(header->reg_country_num);
 230         countries = get_file_ptr(db, dblen,
 231                                  sizeof(struct regdb_file_reg_country) * num_countries,
 232                                  header->reg_country_ptr);
 233
 234         for (i = 0; i < num_countries; i++) {
 235                 struct regdb_file_reg_rules_collection *rcoll;
 236                 struct regdb_file_reg_country *country = countries + i;
 237                 int num_rules;
 238
 239                 printf("country %.2s:\n", country->alpha2);
 240                 rcoll = get_file_ptr(db, dblen, sizeof(*rcoll), country->reg_collection_ptr);
 241                 num_rules = ntohl(rcoll->reg_rule_num);
 242                 /* re-get pointer with sanity checking for num_rules */
 243                 rcoll = get_file_ptr(db, dblen,
 244                                      sizeof(*rcoll) + num_rules * sizeof(__be32),
 245                                      country->reg_collection_ptr);
 246                 for (j = 0; j < num_rules; j++)
 247                         print_reg_rule(db, dblen, rcoll->reg_rule_ptrs[j]);
 248                 printf("\n");
 249         }
 250
 251         return 0;
 252 }