/* JNI interface: constructs arguments and calls main function */ int fwknop_sendSPAPacket( const char *allowip_str, const char *access_str, const char *destip_str, const char *passwd_str, const char *fw_timeout_str ) { fko_ctx_t ctx; fwknop_options_t opts; int res; char res_msg[MSG_BUFSIZE+1] = {0}; char spa_msg[MSG_BUFSIZE+1] = {0}; printf("**** Init fwknop ****\n"); memset(&opts, 0, sizeof(fwknop_options_t)); /* Sanity checks */ if(access_str == NULL) { sprintf(res_msg, "Error: Invalid or missing access string"); goto cleanup2; } if(allowip_str == NULL) { sprintf(res_msg, "Error: Invalid or missing allow IP"); goto cleanup2; } if(destip_str == NULL) { sprintf(res_msg, "Error: Invalid or missing destination IP"); goto cleanup2; } if(passwd_str == NULL) { sprintf(res_msg, "Error: Invalid or missing password"); goto cleanup2; } if(fw_timeout_str == NULL) { sprintf(res_msg, "Error: Invalid or missing firewall timeout value"); goto cleanup2; } /* Set our spa server info */ opts.spa_server_str = (char*)destip_str; opts.spa_dst_port = FKO_DEFAULT_PORT; /* Until we make this settable. */ /* Intialize the context */ res = fko_new(&ctx); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Unable to create FKO context", res)); goto cleanup2; } /* Set client timeout */ res = fko_set_spa_client_timeout(ctx, atoi(fw_timeout_str)); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error setting FW timeout", res)); goto cleanup; } /* Set the spa message string */ snprintf(spa_msg, MSG_BUFSIZE, "%s,%s", allowip_str, access_str); res = fko_set_spa_message(ctx, spa_msg); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error setting SPA request message", res)); goto cleanup; } /* Finalize the context data (Encrypt and encode). */ res = fko_spa_data_final(ctx, (char*)passwd_str); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error generating SPA data", res)); goto cleanup; } res = fko_get_spa_data(ctx, &opts.spa_data); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error getting SPA data", res)); goto cleanup; } /* --DSS NOTE: At this point, we could just return the SPA data * to the caller and use the Java network libs to send * the packet and eliminate the spa_comm code altogether. */ /* Send the spa data packet */ res = send_spa_packet(&opts); if (res < 0) { sprintf(res_msg, "Error: send_spa_packet: packet not sent."); } else if (res == 0) { sprintf(res_msg, "Error: send_spa_packet: Empty packet sent."); } else { sprintf(res_msg, "SPA Packet sent successfully."); } cleanup: /* Release the resources used by the fko context. */ fko_destroy(ctx); cleanup2: /* Log and return a string of success or error message. * This can be enhanced semantically with codes. */ printf("%s\n", res_msg); printf("**** Closing fwknop ****\n"); return res; // (*env)->NewStringUTF(env, res_msg); }
int main(int argc, char **argv) { fko_ctx_t ctx = NULL; fko_ctx_t ctx2 = NULL; int res; char *spa_data=NULL, *version=NULL; char access_buf[MAX_LINE_LEN] = {0}; char key[MAX_KEY_LEN+1] = {0}; char hmac_key[MAX_KEY_LEN+1] = {0}; int key_len = 0, orig_key_len = 0, hmac_key_len = 0, enc_mode; int tmp_port = 0; char dump_buf[CTX_DUMP_BUFSIZE]; fko_cli_options_t options; memset(&options, 0x0, sizeof(fko_cli_options_t)); /* Initialize the log module */ log_new(); /* Handle command line */ config_init(&options, argc, argv); #if HAVE_LIBFIU /* Set any fault injection points early */ if(! enable_fault_injections(&options)) clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); #endif /* Handle previous execution arguments if required */ if(prev_exec(&options, argc, argv) != 1) clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); if(options.show_last_command) clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_SUCCESS); /* Intialize the context */ res = fko_new(&ctx); if(res != FKO_SUCCESS) { errmsg("fko_new", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Display version info and exit. */ if(options.version) { fko_get_version(ctx, &version); fprintf(stdout, "fwknop client %s, FKO protocol version %s\n", MY_VERSION, version); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_SUCCESS); } /* Set client timeout */ if(options.fw_timeout >= 0) { res = fko_set_spa_client_timeout(ctx, options.fw_timeout); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_client_timeout", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* Set the SPA packet message type based on command line options */ res = set_message_type(ctx, &options); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_message_type", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Adjust the SPA timestamp if necessary */ if(options.time_offset_plus > 0) { res = fko_set_timestamp(ctx, options.time_offset_plus); if(res != FKO_SUCCESS) { errmsg("fko_set_timestamp", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } if(options.time_offset_minus > 0) { res = fko_set_timestamp(ctx, -options.time_offset_minus); if(res != FKO_SUCCESS) { errmsg("fko_set_timestamp", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } if(options.server_command[0] != 0x0) { /* Set the access message to a command that the server will * execute */ snprintf(access_buf, MAX_LINE_LEN, "%s%s%s", options.allow_ip_str, ",", options.server_command); } else { /* Resolve the client's public facing IP address if requestesd. * if this fails, consider it fatal. */ if (options.resolve_ip_http_https) { if(options.resolve_http_only) { if(resolve_ip_http(&options) < 0) { clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } else { /* Default to HTTPS */ if(resolve_ip_https(&options) < 0) { clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } } /* Set a message string by combining the allow IP and the * port/protocol. The fwknopd server allows no port/protocol * to be specified as well, so in this case append the string * "none/0" to the allow IP. */ if(set_access_buf(ctx, &options, access_buf) != 1) clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } res = fko_set_spa_message(ctx, access_buf); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_message", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Set NAT access string */ if (options.nat_local || options.nat_access_str[0] != 0x0) { res = set_nat_access(ctx, &options, access_buf); if(res != FKO_SUCCESS) { errmsg("fko_set_nat_access_str", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* Set username */ if(options.spoof_user[0] != 0x0) { res = fko_set_username(ctx, options.spoof_user); if(res != FKO_SUCCESS) { errmsg("fko_set_username", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* Set up for using GPG if specified. */ if(options.use_gpg) { /* If use-gpg-agent was not specified, then remove the GPG_AGENT_INFO * ENV variable if it exists. */ #ifndef WIN32 if(!options.use_gpg_agent) unsetenv("GPG_AGENT_INFO"); #endif res = fko_set_spa_encryption_type(ctx, FKO_ENCRYPTION_GPG); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_encryption_type", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Set gpg path if necessary */ if(strlen(options.gpg_exe) > 0) { res = fko_set_gpg_exe(ctx, options.gpg_exe); if(res != FKO_SUCCESS) { errmsg("fko_set_gpg_exe", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* If a GPG home dir was specified, set it here. Note: Setting * this has to occur before calling any of the other GPG-related * functions. */ if(strlen(options.gpg_home_dir) > 0) { res = fko_set_gpg_home_dir(ctx, options.gpg_home_dir); if(res != FKO_SUCCESS) { errmsg("fko_set_gpg_home_dir", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } res = fko_set_gpg_recipient(ctx, options.gpg_recipient_key); if(res != FKO_SUCCESS) { errmsg("fko_set_gpg_recipient", res); if(IS_GPG_ERROR(res)) log_msg(LOG_VERBOSITY_ERROR, "GPG ERR: %s", fko_gpg_errstr(ctx)); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } if(strlen(options.gpg_signer_key) > 0) { res = fko_set_gpg_signer(ctx, options.gpg_signer_key); if(res != FKO_SUCCESS) { errmsg("fko_set_gpg_signer", res); if(IS_GPG_ERROR(res)) log_msg(LOG_VERBOSITY_ERROR, "GPG ERR: %s", fko_gpg_errstr(ctx)); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } res = fko_set_spa_encryption_mode(ctx, FKO_ENC_MODE_ASYMMETRIC); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_encryption_mode", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } if(options.encryption_mode && !options.use_gpg) { res = fko_set_spa_encryption_mode(ctx, options.encryption_mode); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_encryption_mode", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* Set Digest type. */ if(options.digest_type) { res = fko_set_spa_digest_type(ctx, options.digest_type); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_digest_type", res); clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } /* Acquire the necessary encryption/hmac keys */ if(get_keys(ctx, &options, key, &key_len, hmac_key, &hmac_key_len) != 1) clean_exit(ctx, &options, key, &key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); orig_key_len = key_len; if(options.encryption_mode == FKO_ENC_MODE_CBC_LEGACY_IV && key_len > 16) { log_msg(LOG_VERBOSITY_ERROR, "WARNING: Encryption key in '-M legacy' mode must be <= 16 bytes"); log_msg(LOG_VERBOSITY_ERROR, "long - truncating before sending SPA packet. Upgrading remote"); log_msg(LOG_VERBOSITY_ERROR, "fwknopd is recommended."); key_len = 16; } /* Finalize the context data (encrypt and encode the SPA data) */ res = fko_spa_data_final(ctx, key, key_len, hmac_key, hmac_key_len); if(res != FKO_SUCCESS) { errmsg("fko_spa_data_final", res); if(IS_GPG_ERROR(res)) log_msg(LOG_VERBOSITY_ERROR, "GPG ERR: %s", fko_gpg_errstr(ctx)); clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Display the context data. */ if (options.verbose || options.test) { res = dump_ctx_to_buffer(ctx, dump_buf, sizeof(dump_buf)); if (res == FKO_SUCCESS) log_msg(LOG_VERBOSITY_NORMAL, "%s", dump_buf); else log_msg(LOG_VERBOSITY_WARNING, "Unable to dump FKO context: %s", fko_errstr(res)); } /* Save packet data payload if requested. */ if (options.save_packet_file[0] != 0x0) write_spa_packet_data(ctx, &options); /* SPA packet random destination port handling */ if (options.rand_port) { tmp_port = get_rand_port(ctx); if(tmp_port < 0) clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); options.spa_dst_port = tmp_port; } /* If we are using one the "raw" modes (normally because * we're going to spoof the SPA packet source IP), then select * a random source port unless the source port is already set */ if ((options.spa_proto == FKO_PROTO_TCP_RAW || options.spa_proto == FKO_PROTO_UDP_RAW || options.spa_proto == FKO_PROTO_ICMP) && !options.spa_src_port) { tmp_port = get_rand_port(ctx); if(tmp_port < 0) clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); options.spa_src_port = tmp_port; } res = send_spa_packet(ctx, &options); if(res < 0) { log_msg(LOG_VERBOSITY_ERROR, "send_spa_packet: packet not sent."); clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } else { log_msg(LOG_VERBOSITY_INFO, "send_spa_packet: bytes sent: %i", res); } /* Run through a decode cycle in test mode (--DSS XXX: This test/decode * portion should be moved elsewhere). */ if (options.test) { /************** Decoding now *****************/ /* Now we create a new context based on data from the first one. */ res = fko_get_spa_data(ctx, &spa_data); if(res != FKO_SUCCESS) { errmsg("fko_get_spa_data", res); clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* Pull the encryption mode. */ res = fko_get_spa_encryption_mode(ctx, &enc_mode); if(res != FKO_SUCCESS) { errmsg("fko_get_spa_encryption_mode", res); if(fko_destroy(ctx) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx = NULL; clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* If gpg-home-dir is specified, we have to defer decrypting if we * use the fko_new_with_data() function because we need to set the * gpg home dir after the context is created, but before we attempt * to decrypt the data. Therefore we either pass NULL for the * decryption key to fko_new_with_data() or use fko_new() to create * an empty context, populate it with the encrypted data, set our * options, then decode it. * * This also verifies the HMAC and truncates it if there are no * problems. */ res = fko_new_with_data(&ctx2, spa_data, NULL, 0, enc_mode, hmac_key, hmac_key_len, options.hmac_type); if(res != FKO_SUCCESS) { errmsg("fko_new_with_data", res); if(fko_destroy(ctx2) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx2 = NULL; clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } res = fko_set_spa_encryption_mode(ctx2, enc_mode); if(res != FKO_SUCCESS) { errmsg("fko_set_spa_encryption_mode", res); if(fko_destroy(ctx2) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx2 = NULL; clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } /* See if we are using gpg and if we need to set the GPG home dir. */ if(options.use_gpg) { if(strlen(options.gpg_home_dir) > 0) { res = fko_set_gpg_home_dir(ctx2, options.gpg_home_dir); if(res != FKO_SUCCESS) { errmsg("fko_set_gpg_home_dir", res); if(fko_destroy(ctx2) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx2 = NULL; clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } } } /* Decrypt */ res = fko_decrypt_spa_data(ctx2, key, key_len); if(res != FKO_SUCCESS) { errmsg("fko_decrypt_spa_data", res); if(IS_GPG_ERROR(res)) { /* we most likely could not decrypt the gpg-encrypted data * because we don't have access to the private key associated * with the public key we used for encryption. Since this is * expected, return 0 instead of an error condition (so calling * programs like the fwknop test suite don't interpret this as * an unrecoverable error), but print the error string for * debugging purposes. The test suite does run a series of * tests that use a single key pair for encryption and * authentication, so decryption become possible for these * tests. */ log_msg(LOG_VERBOSITY_ERROR, "GPG ERR: %s\n%s", fko_gpg_errstr(ctx2), "No access to recipient private key?"); } if(fko_destroy(ctx2) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx2 = NULL; clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_FAILURE); } res = dump_ctx_to_buffer(ctx2, dump_buf, sizeof(dump_buf)); if (res == FKO_SUCCESS) log_msg(LOG_VERBOSITY_NORMAL, "\nDump of the Decoded Data\n%s", dump_buf); else log_msg(LOG_VERBOSITY_WARNING, "Unable to dump FKO context: %s", fko_errstr(res)); if(fko_destroy(ctx2) == FKO_ERROR_ZERO_OUT_DATA) log_msg(LOG_VERBOSITY_ERROR, "[*] Could not zero out sensitive data buffer."); ctx2 = NULL; } clean_exit(ctx, &options, key, &orig_key_len, hmac_key, &hmac_key_len, EXIT_SUCCESS); return EXIT_SUCCESS; /* quiet down a gcc warning */ }
/* JNI interface: constructs arguments and calls main function */ jstring Java_com_max2idea_android_fwknop_Fwknop_sendSPAPacket(JNIEnv* env, jobject thiz) { fko_ctx_t ctx; fwknop_options_t opts; int res, hmac_str_len = 0; char res_msg[MSG_BUFSIZE+1] = {0}; char spa_msg[MSG_BUFSIZE+1] = {0}; LOGV("**** Init fwknop ****"); memset(&opts, 0, sizeof(fwknop_options_t)); /* Read the member values from the Java Object that called sendSPAPacket() method */ jclass c = (*env)->GetObjectClass(env, thiz); jfieldID fid = (*env)->GetFieldID(env, c, "access_str", "Ljava/lang/String;"); jstring jaccess = (*env)->GetObjectField(env, thiz, fid); const char *access_str = (*env)->GetStringUTFChars(env, jaccess, 0); fid = (*env)->GetFieldID(env, c, "allowip_str", "Ljava/lang/String;"); jstring jallowip = (*env)->GetObjectField(env, thiz, fid); const char *allowip_str = (*env)->GetStringUTFChars(env, jallowip, 0); fid = (*env)->GetFieldID(env, c, "destip_str", "Ljava/lang/String;"); jstring jdestip = (*env)->GetObjectField(env, thiz, fid); const char *destip_str = (*env)->GetStringUTFChars(env, jdestip, 0); fid = (*env)->GetFieldID(env, c, "passwd_str", "Ljava/lang/String;"); jstring jpasswd = (*env)->GetObjectField(env, thiz, fid); const char *passwd_str = (*env)->GetStringUTFChars(env, jpasswd, 0); fid = (*env)->GetFieldID(env, c, "hmac_str", "Ljava/lang/String;"); jstring jhmac = (*env)->GetObjectField(env, thiz, fid); const char *hmac_str = (*env)->GetStringUTFChars(env, jhmac, 0); fid = (*env)->GetFieldID(env, c, "fw_timeout_str", "Ljava/lang/String;"); jstring jfwtimeout = (*env)->GetObjectField(env, thiz, fid); const char *fw_timeout_str = (*env)->GetStringUTFChars(env, jfwtimeout, 0); /* Sanity checks */ if(access_str == NULL) { sprintf(res_msg, "Error: Invalid or missing access string"); goto cleanup2; } if(allowip_str == NULL) { sprintf(res_msg, "Error: Invalid or missing allow IP"); goto cleanup2; } if(destip_str == NULL) { sprintf(res_msg, "Error: Invalid or missing destination IP"); goto cleanup2; } if(passwd_str == NULL) { sprintf(res_msg, "Error: Invalid or missing password"); goto cleanup2; } if(fw_timeout_str == NULL) { sprintf(res_msg, "Error: Invalid or missing firewall timeout value"); goto cleanup2; } /* Using an HMAC is optional (currently) */ if(hmac_str != NULL) { hmac_str_len = (int)strlen(hmac_str); } /* Set our spa server info */ opts.spa_server_str = (char*)destip_str; opts.spa_dst_port = FKO_DEFAULT_PORT; /* Until we make this settable. */ /* Intialize the context */ res = fko_new(&ctx); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Unable to create FKO context", res)); goto cleanup2; } /* Set client timeout */ res = fko_set_spa_client_timeout(ctx, atoi(fw_timeout_str)); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error setting FW timeout", res)); goto cleanup; } /* Set the spa message string */ snprintf(spa_msg, MSG_BUFSIZE, "%s,%s", allowip_str, access_str); res = fko_set_spa_message(ctx, spa_msg); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error setting SPA request message", res)); goto cleanup; } /* Set the HMAC mode if necessary */ if (hmac_str_len > 0) { res = fko_set_spa_hmac_type(ctx, FKO_DEFAULT_HMAC_MODE); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error setting SPA HMAC type", res)); goto cleanup; } } /* Finalize the context data (Encrypt and encode). */ res = fko_spa_data_final(ctx, (char*)passwd_str, (int)strlen(passwd_str), (char *)hmac_str, hmac_str_len); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error generating SPA data", res)); goto cleanup; } res = fko_get_spa_data(ctx, &opts.spa_data); if (res != FKO_SUCCESS) { strcpy(res_msg, fko_errmsg("Error getting SPA data", res)); goto cleanup; } /* --DSS NOTE: At this point, we could just return the SPA data * to the caller and use the Java network libs to send * the packet and eliminate the spa_comm code altogether. */ /* Send the spa data packet */ res = send_spa_packet(&opts); if (res < 0) { sprintf(res_msg, "Error: send_spa_packet: packet not sent."); } else if (res == 0) { sprintf(res_msg, "Error: send_spa_packet: Empty packet sent."); } else { sprintf(res_msg, "SPA Packet sent successfully."); } cleanup: /* Release the resources used by the fko context. */ fko_destroy(ctx); cleanup2: /* Release mem */ (*env)->ReleaseStringUTFChars(env, jaccess, access_str); (*env)->ReleaseStringUTFChars(env, jallowip, allowip_str); (*env)->ReleaseStringUTFChars(env, jdestip, destip_str); (*env)->ReleaseStringUTFChars(env, jpasswd, passwd_str); (*env)->ReleaseStringUTFChars(env, jhmac, hmac_str); (*env)->ReleaseStringUTFChars(env, jfwtimeout, fw_timeout_str); /* Log and return a string of success or error message. * This can be enhanced semantically with codes. */ LOGV("%s", res_msg); return (*env)->NewStringUTF(env, res_msg); }