respondd: generate ed25519 key if not existing
This commit is contained in:
parent
df328249e2
commit
84a7ab8074
|
@ -11,11 +11,16 @@ include $(INCLUDE_DIR)/cmake.mk
|
||||||
define Package/respondd
|
define Package/respondd
|
||||||
SECTION:=net
|
SECTION:=net
|
||||||
CATEGORY:=Network
|
CATEGORY:=Network
|
||||||
DEPENDS:=@IPV6 +libjson-c +libecdsautil
|
DEPENDS:=@IPV6 +libjson-c +libecdsautil +libuci
|
||||||
TITLE:=Responds to multicast queries with answers generated by Lua code
|
TITLE:=Responds to multicast queries with answers generated by Lua code
|
||||||
endef
|
endef
|
||||||
|
|
||||||
|
define Package/respondd/conffiles
|
||||||
|
/etc/config/respondd
|
||||||
|
endef
|
||||||
|
|
||||||
define Package/respondd/install
|
define Package/respondd/install
|
||||||
|
$(CP) ./files/* $(1)/
|
||||||
$(INSTALL_DIR) $(1)/usr/bin
|
$(INSTALL_DIR) $(1)/usr/bin
|
||||||
$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/respondd $(1)/usr/bin/
|
$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/respondd $(1)/usr/bin/
|
||||||
endef
|
endef
|
||||||
|
|
|
@ -0,0 +1,2 @@
|
||||||
|
|
||||||
|
config respondd settings
|
|
@ -8,6 +8,10 @@ find_package(JSON_C REQUIRED)
|
||||||
|
|
||||||
set_property(DIRECTORY PROPERTY COMPILE_DEFINITIONS _GNU_SOURCE)
|
set_property(DIRECTORY PROPERTY COMPILE_DEFINITIONS _GNU_SOURCE)
|
||||||
|
|
||||||
|
# libuci
|
||||||
|
find_library(UCI_LIBRARY NAMES uci)
|
||||||
|
include_directories(${UCI_INCLUDE_DIRS})
|
||||||
|
|
||||||
# libecdsautil
|
# libecdsautil
|
||||||
find_package(PkgConfig REQUIRED QUIET)
|
find_package(PkgConfig REQUIRED QUIET)
|
||||||
pkg_check_modules(ECDSAUTIL REQUIRED ecdsautil)
|
pkg_check_modules(ECDSAUTIL REQUIRED ecdsautil)
|
||||||
|
@ -17,7 +21,12 @@ add_executable(respondd respondd.c)
|
||||||
set_property(TARGET respondd PROPERTY COMPILE_FLAGS "-Wall -std=c99 -fno-strict-aliasing ${JSON_C_CFLAGS_OTHER}")
|
set_property(TARGET respondd PROPERTY COMPILE_FLAGS "-Wall -std=c99 -fno-strict-aliasing ${JSON_C_CFLAGS_OTHER}")
|
||||||
set_property(TARGET respondd PROPERTY LINK_FLAGS "${JSON_C_LDFLAGS_OTHER}")
|
set_property(TARGET respondd PROPERTY LINK_FLAGS "${JSON_C_LDFLAGS_OTHER}")
|
||||||
set_property(TARGET respondd APPEND PROPERTY INCLUDE_DIRECTORIES ${JSON_C_INCLUDE_DIR})
|
set_property(TARGET respondd APPEND PROPERTY INCLUDE_DIRECTORIES ${JSON_C_INCLUDE_DIR})
|
||||||
target_link_libraries(respondd ${JSON_C_LIBRARIES} ${ECDSAUTIL_LIBRARIES} dl)
|
target_link_libraries(
|
||||||
|
respondd
|
||||||
|
${JSON_C_LIBRARIES}
|
||||||
|
${ECDSAUTIL_LIBRARIES}
|
||||||
|
${UCI_LIBRARY}
|
||||||
|
dl)
|
||||||
|
|
||||||
install(TARGETS respondd RUNTIME DESTINATION bin)
|
install(TARGETS respondd RUNTIME DESTINATION bin)
|
||||||
|
|
||||||
|
|
|
@ -55,11 +55,15 @@
|
||||||
|
|
||||||
#include <ecdsautil/ecdsa.h>
|
#include <ecdsautil/ecdsa.h>
|
||||||
#include <ecdsautil/sha256.h>
|
#include <ecdsautil/sha256.h>
|
||||||
|
#include <uci.h>
|
||||||
|
|
||||||
#define SCHEDULE_LEN 8
|
#define SCHEDULE_LEN 8
|
||||||
#define REQUEST_MAXLEN 256
|
#define REQUEST_MAXLEN 256
|
||||||
#define MAX_MULTICAST_DELAY_DEFAULT 0
|
#define MAX_MULTICAST_DELAY_DEFAULT 0
|
||||||
|
|
||||||
|
ecc_int256_t ed25519_secret;
|
||||||
|
ecc_int256_t ed25519_public;
|
||||||
|
|
||||||
struct interface_info {
|
struct interface_info {
|
||||||
struct interface_info *next;
|
struct interface_info *next;
|
||||||
|
|
||||||
|
@ -362,11 +366,37 @@ static struct json_object * eval_providers(struct provider_list *providers) {
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int random_bytes(unsigned char *buffer, size_t len) {
|
||||||
|
int fd;
|
||||||
|
size_t read_bytes = 0;
|
||||||
|
|
||||||
static void public_from_secret(ecc_int256_t *pub, const ecc_int256_t *secret) {
|
fd = open("/dev/random", O_RDONLY);
|
||||||
ecc_25519_work_t work;
|
|
||||||
ecc_25519_scalarmult_base(&work, secret);
|
if (fd < 0) {
|
||||||
ecc_25519_store_packed_legacy(pub, &work);
|
fprintf(stderr, "Can't open /dev/random: %s\n", strerror(errno));
|
||||||
|
goto out_error;
|
||||||
|
}
|
||||||
|
|
||||||
|
while (read_bytes < len) {
|
||||||
|
ssize_t ret = read(fd, buffer + read_bytes, len - read_bytes);
|
||||||
|
|
||||||
|
if (ret < 0) {
|
||||||
|
if (errno == EINTR)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
fprintf(stderr, "Unable to read random bytes: %s\n", strerror(errno));
|
||||||
|
goto out_error;
|
||||||
|
}
|
||||||
|
|
||||||
|
read_bytes += ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
close(fd);
|
||||||
|
return 1;
|
||||||
|
|
||||||
|
out_error:
|
||||||
|
close(fd);
|
||||||
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
// str must be a char[2*(offset+len)+1]
|
// str must be a char[2*(offset+len)+1]
|
||||||
|
@ -378,6 +408,92 @@ static void sprintf_hex(char *str_buf, const uint8_t *buf, size_t len, size_t of
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int parsehex(void *buffer, const char *string, size_t len) {
|
||||||
|
// number of digits must be even
|
||||||
|
if ((strlen(string) & 1) == 1)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
// number of digits must be 2 * len
|
||||||
|
if (strlen(string) != 2 * len)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
while (len--) {
|
||||||
|
int ret;
|
||||||
|
ret = sscanf(string, "%02hhx", (char*)(buffer++));
|
||||||
|
string += 2;
|
||||||
|
|
||||||
|
if (ret != 1)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (len != -1)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
ecc_int256_t read_or_generate_key() {
|
||||||
|
struct uci_context *ctx = uci_alloc_context();
|
||||||
|
if (!ctx) {
|
||||||
|
fprintf(stderr, "respondd: error: failed to allocate UCI context\n");
|
||||||
|
abort();
|
||||||
|
}
|
||||||
|
|
||||||
|
ctx->flags &= ~UCI_FLAG_STRICT;
|
||||||
|
|
||||||
|
struct uci_package *p;
|
||||||
|
struct uci_section *s;
|
||||||
|
|
||||||
|
if (uci_load(ctx, "respondd", &p) != UCI_OK) {
|
||||||
|
fputs("respondd: error: unable to load UCI package\n", stderr);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
s = uci_lookup_section(ctx, p, "settings");
|
||||||
|
if (!s || strcmp(s->type, "respondd")) {
|
||||||
|
fputs("respondd: error: could not load UCI section respondd.settings\n", stderr);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
const char *secret_str = uci_lookup_option_string(ctx, s, "secret");
|
||||||
|
ecc_int256_t secret;
|
||||||
|
|
||||||
|
if (!secret_str || !parsehex(&secret, secret_str, 32)) {
|
||||||
|
fputs("respondd: no valid key found. generating new key.\n", stderr);
|
||||||
|
|
||||||
|
// generate it
|
||||||
|
if (!random_bytes(secret.p, 32)) {
|
||||||
|
fputs("respondd: unable to read random bytes.\n", stderr);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
ecc_25519_gf_sanitize_secret(&secret, &secret);
|
||||||
|
|
||||||
|
// save it to uci
|
||||||
|
char secret_str_new[64+1];
|
||||||
|
sprintf_hex(secret_str_new, secret.p, 32, 0);
|
||||||
|
struct uci_ptr ptr ={
|
||||||
|
.package = "respondd",
|
||||||
|
.section = "settings",
|
||||||
|
.option = "secret",
|
||||||
|
.value = secret_str_new,
|
||||||
|
};
|
||||||
|
uci_set(ctx, &ptr);
|
||||||
|
uci_commit(ctx, &ptr.p, false);
|
||||||
|
uci_unload(ctx, ptr.p);
|
||||||
|
fputs("respondd: key generated and saved.\n", stderr);
|
||||||
|
}
|
||||||
|
|
||||||
|
uci_free_context(ctx);
|
||||||
|
|
||||||
|
return secret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void public_from_secret(ecc_int256_t *pub, const ecc_int256_t *secret) {
|
||||||
|
ecc_25519_work_t work;
|
||||||
|
ecc_25519_scalarmult_base(&work, secret);
|
||||||
|
ecc_25519_store_packed_legacy(pub, &work);
|
||||||
|
}
|
||||||
|
|
||||||
// The string representation of obj is signed using the secret. After signing,
|
// The string representation of obj is signed using the secret. After signing,
|
||||||
// a structure containing the public key and the signature is added into obj.
|
// a structure containing the public key and the signature is added into obj.
|
||||||
// The obj looks like this after calling sign_json(obj, ...):
|
// The obj looks like this after calling sign_json(obj, ...):
|
||||||
|
@ -450,15 +566,7 @@ static struct json_object * single_request(char *type) {
|
||||||
|
|
||||||
struct json_object *ret = eval_providers(r->providers);
|
struct json_object *ret = eval_providers(r->providers);
|
||||||
|
|
||||||
ecc_int256_t secret = { .p = {
|
sign_json(ret, &ed25519_secret, &ed25519_public);
|
||||||
0x18, 0x70, 0x58, 0x06, 0x14, 0xb8, 0xa0, 0xc3,
|
|
||||||
0xd2, 0x26, 0x97, 0x53, 0xeb, 0x59, 0x4a, 0xb8,
|
|
||||||
0x84, 0x54, 0x21, 0xb6, 0x6c, 0x0d, 0xe5, 0x31,
|
|
||||||
0xa2, 0xcb, 0x8e, 0x82, 0xc1, 0x65, 0x36, 0x45
|
|
||||||
}};
|
|
||||||
ecc_int256_t pub;
|
|
||||||
public_from_secret(&pub, &secret);
|
|
||||||
sign_json(ret, &secret, &pub);
|
|
||||||
|
|
||||||
if (r->cache_time) {
|
if (r->cache_time) {
|
||||||
if (r->cache)
|
if (r->cache)
|
||||||
|
@ -821,6 +929,10 @@ int main(int argc, char **argv) {
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// load keys for ed25519 signatures
|
||||||
|
ed25519_secret = read_or_generate_key();
|
||||||
|
public_from_secret(&ed25519_public, &ed25519_secret);
|
||||||
|
|
||||||
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
|
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
|
||||||
perror("bind failed");
|
perror("bind failed");
|
||||||
exit(EXIT_FAILURE);
|
exit(EXIT_FAILURE);
|
||||||
|
|
Loading…
Reference in New Issue