+static void esp_print_addsa(netdissect_options *ndo,
+ struct sa_list *sa, int sa_def)
+{
+ /* copy the "sa" */
+
+ struct sa_list *nsa;
+
+ nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
+ if (nsa == NULL)
+ (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
+
+ *nsa = *sa;
+
+ if (sa_def)
+ ndo->ndo_sa_default = nsa;
+
+ nsa->next = ndo->ndo_sa_list_head;
+ ndo->ndo_sa_list_head = nsa;
+}
+
+
+static int hexdigit(netdissect_options *ndo, char hex)
+{
+ if (hex >= '0' && hex <= '9')
+ return (hex - '0');
+ else if (hex >= 'A' && hex <= 'F')
+ return (hex - 'A' + 10);
+ else if (hex >= 'a' && hex <= 'f')
+ return (hex - 'a' + 10);
+ else {
+ (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
+ return 0;
+ }
+}
+
+static int hex2byte(netdissect_options *ndo, char *hexstring)
+{
+ int byte;
+
+ byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
+ return byte;
+}
+
+/*
+ * decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
+ *
+ * special form: file /name
+ * causes us to go read from this file instead.
+ *
+ */
+static void esp_print_decode_onesecret(netdissect_options *ndo, char *line)
+{
+ struct sa_list sa1;
+ int sa_def;
+
+ char *spikey;
+ char *decode;
+
+ spikey = strsep(&line, " \t");
+ sa_def = 0;
+ memset(&sa1, 0, sizeof(struct sa_list));
+
+ /* if there is only one token, then it is an algo:key token */
+ if (line == NULL) {
+ decode = spikey;
+ spikey = NULL;
+ /* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
+ /* sa1.spi = 0; */
+ sa_def = 1;
+ } else
+ decode = line;
+
+ if (spikey && strcasecmp(spikey, "file") == 0) {
+ /* open file and read it */
+ FILE *secretfile;
+ char fileline[1024];
+ char *nl;
+
+ secretfile = fopen(line, FOPEN_READ_TXT);
+ if (secretfile == NULL) {
+ perror(line);
+ exit(3);
+ }
+
+ while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
+ /* remove newline from the line */
+ nl = strchr(fileline, '\n');
+ if (nl)
+ *nl = '\0';
+ if (fileline[0] == '#') continue;
+ if (fileline[0] == '\0') continue;
+
+ esp_print_decode_onesecret(ndo, fileline);
+ }
+ fclose(secretfile);
+
+ return;
+ }
+
+ if (spikey) {
+ char *spistr, *foo;
+ u_int32_t spino;
+ struct sockaddr_in *sin;
+#ifdef INET6
+ struct sockaddr_in6 *sin6;
+#endif
+
+ spistr = strsep(&spikey, "@");
+
+ spino = strtoul(spistr, &foo, 0);
+ if (spistr == foo || !spikey) {
+ (*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo);
+ return;
+ }
+
+ sa1.spi = spino;
+
+ sin = (struct sockaddr_in *)&sa1.daddr;
+#ifdef INET6
+ sin6 = (struct sockaddr_in6 *)&sa1.daddr;
+ if (inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) {
+#ifdef HAVE_SOCKADDR_SA_LEN
+ sin6->sin6_len = sizeof(struct sockaddr_in6);
+#endif
+ sin6->sin6_family = AF_INET6;
+ } else
+#endif
+ if (inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) {
+#ifdef HAVE_SOCKADDR_SA_LEN
+ sin->sin_len = sizeof(struct sockaddr_in);
+#endif
+ sin->sin_family = AF_INET;
+ } else {
+ (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
+ return;
+ }
+ }
+
+ if (decode) {
+ char *colon, *p;
+ char espsecret_key[256];
+ int len;
+ size_t i;
+ const EVP_CIPHER *evp;
+ int authlen = 0;
+
+ /* skip any blank spaces */
+ while (isspace((unsigned char)*decode))
+ decode++;
+
+ colon = strchr(decode, ':');
+ if (colon == NULL) {
+ (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
+ return;
+ }
+ *colon = '\0';
+
+ len = colon - decode;
+ if (strlen(decode) > strlen("-hmac96") &&
+ !strcmp(decode + strlen(decode) - strlen("-hmac96"),
+ "-hmac96")) {
+ p = strstr(decode, "-hmac96");
+ *p = '\0';
+ authlen = 12;
+ }
+ if (strlen(decode) > strlen("-cbc") &&
+ !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
+ p = strstr(decode, "-cbc");
+ *p = '\0';
+ }
+ evp = EVP_get_cipherbyname(decode);
+ if (!evp) {
+ (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
+ sa1.evp = NULL;
+ sa1.authlen = 0;
+ sa1.ivlen = 0;
+ return;
+ }
+
+ sa1.evp = evp;
+ sa1.authlen = authlen;
+ sa1.ivlen = EVP_CIPHER_iv_length(evp);
+
+ colon++;
+ if (colon[0] == '0' && colon[1] == 'x') {
+ /* decode some hex! */
+ colon += 2;
+ len = strlen(colon) / 2;
+
+ if (len > 256) {
+ (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
+ return;
+ }
+
+ i = 0;
+ while (colon[0] != '\0' && colon[1]!='\0') {
+ espsecret_key[i] = hex2byte(ndo, colon);
+ colon += 2;
+ i++;
+ }
+
+ memcpy(sa1.secret, espsecret_key, i);
+ sa1.secretlen = i;
+ } else {
+ i = strlen(colon);
+
+ if (i < sizeof(sa1.secret)) {
+ memcpy(sa1.secret, colon, i);
+ sa1.secretlen = i;
+ } else {
+ memcpy(sa1.secret, colon, sizeof(sa1.secret));
+ sa1.secretlen = sizeof(sa1.secret);
+ }
+ }
+ }
+
+ esp_print_addsa(ndo, &sa1, sa_def);
+}
+
+static void esp_print_decodesecret(netdissect_options *ndo)
+{
+ char *line;
+ char *p;
+
+ p = ndo->ndo_espsecret;
+
+ while (ndo->ndo_espsecret && ndo->ndo_espsecret[0] != '\0') {
+ /* pick out the first line or first thing until a comma */
+ if ((line = strsep(&ndo->ndo_espsecret, "\n,")) == NULL) {
+ line = ndo->ndo_espsecret;
+ ndo->ndo_espsecret = NULL;
+ }
+
+ esp_print_decode_onesecret(ndo, line);
+ }
+}
+
+static void esp_init(netdissect_options *ndo _U_)
+{
+
+ OpenSSL_add_all_algorithms();
+ EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
+}
+#endif
projects / tcpdump / blobdiff