int serval_verify_client(const char *sid_str,
const size_t sid_len,
const unsigned char *msg,
const size_t msg_len,
const char *sig,
const size_t sig_len,
const char *keyring_path,
const size_t keyring_len) {
int verdict = 0;
char sas_str[2*SAS_SIZE+1] = {0};
unsigned char packedSid[SID_SIZE] = {0};
CHECK(sid_len == 2*SID_SIZE,"Invalid SID length");
CHECK(sig_len == 2*SIGNATURE_BYTES,"Invalid signature length");
CHECK(str_is_subscriber_id(sid_str) != 0,"Invalid SID");
stowSid(packedSid,0,sid_str);
CHECK(serval_init_keyring(packedSid,
SID_SIZE,
keyring_path,
keyring_len,
&keyring,
NULL,
NULL), "Failed to initialize Serval keyring");
struct subscriber *sub = find_subscriber(packedSid, SID_SIZE, 1); // get Serval identity described by given SID
CHECK(sub,"Failed to fetch Serval subscriber");
CHECK(keyring_send_sas_request_client(sub),"SAS request failed");
CHECK(sub->sas_valid,"Could not validate the signing key!");
CHECK(sub->sas_public[0],"Could not validate the signing key!");
CHECK(tohex(sas_str,sub->sas_public,SAS_SIZE),"Failed to convert signing key");
verdict = cmd_serval_verify(sas_str,2*SAS_SIZE,
msg,msg_len,sig,sig_len);
error:
return verdict;
}
/* Used by serval-client */
int
serval_verify_client(svl_crypto_ctx *ctx)
{
CHECK(ctx && ctx->sid[0] && ctx->msg && ctx->signature[0] && ctx->keyring_path,
"Invalid ctx");
CHECK(serval_init_keyring(ctx), "Failed to initialize Serval keyring");
struct subscriber *sub = find_subscriber(ctx->sid, SID_SIZE, 1); // get Serval identity described by given SID
CHECK(sub, "Failed to fetch Serval subscriber");
CHECK(keyring_send_sas_request_client(sub), "SAS request failed");
CHECK(sub->sas_valid, "Could not validate the signing key!");
CHECK(sub->sas_public[0], "Could not validate the signing key!");
memcpy(ctx->sas_public,sub->sas_public,crypto_sign_PUBLICKEYBYTES);
return cmd_serval_verify(ctx);
error:
return 0;
}
int serval_crypto_handler(co_obj_t *self, co_obj_t **output, co_obj_t *params) {
CLEAR_ERR();
int list_len = co_list_length(params), keypath = 0;
CHECK_ERR(IS_LIST(params) && list_len >= 2,"Invalid params");
if (!strncmp("--keyring=",co_obj_data_ptr(co_list_get_last(params)),10)) {
keypath = 1;
--list_len;
}
if (co_str_cmp_str(co_list_element(params,0),"sign") == 0) {
CHECK_ERR(list_len == 2 || list_len == 3,"Invalid arguments");
char sig_buf[2*SIGNATURE_BYTES + 1] = {0};
if (list_len == 3) {
CHECK_ERR(cmd_serval_sign(_LIST_ELEMENT(params,1),
co_str_len(co_list_element(params,1)) - 1,
(unsigned char*)_LIST_ELEMENT(params,2),
co_str_len(co_list_element(params,2)) - 1,
sig_buf,
2*SIGNATURE_BYTES + 1,
keypath ? _LIST_ELEMENT(params,3) + 10 : NULL, // strlen("--length=") == 10
keypath ? co_str_len(co_list_element(params,3)) - 11 : 0),"Failed to create signature");
} else if (list_len == 2) {
CHECK_ERR(cmd_serval_sign(NULL,
0,
(unsigned char*)_LIST_ELEMENT(params,1),
co_str_len(co_list_element(params,1)) - 1,
sig_buf,
2*SIGNATURE_BYTES + 1,
keypath ? _LIST_ELEMENT(params,2) + 10 : NULL, // strlen("--length=") == 10
keypath ? co_str_len(co_list_element(params,2)) - 11 : 0),"Failed to create signature");
}
CMD_OUTPUT("result",co_str8_create(sig_buf,2*SIGNATURE_BYTES+1,0));
} else if (co_str_cmp_str(co_list_element(params,0),"verify") == 0) {
CHECK_ERR(!keypath,"Keyring option not available for verification");
CHECK_ERR(list_len == 4,"Invalid arguments");
int verdict = cmd_serval_verify(_LIST_ELEMENT(params,1),
co_str_len(co_list_element(params,1)) - 1,
(unsigned char*)_LIST_ELEMENT(params,3),
co_str_len(co_list_element(params,3)) - 1,
_LIST_ELEMENT(params,2),
co_str_len(co_list_element(params,2)) - 1);
// keypath ? _LIST_ELEMENT(params,4) + 10 : NULL, // strlen("--length=") == 10
// keypath ? co_str_len(co_list_element(params,4)) - 10 : 0);
if (verdict == 1) {
DEBUG("signature verified");
CMD_OUTPUT("result",co_bool_create(true,0)); // successfully verified
} else if (verdict == 0) {
DEBUG("signature NOT verified");
CMD_OUTPUT("result",co_bool_create(false,0));
}
}
return 1;
error:
INS_ERROR();
return 0;
}
int
serval_crypto_handler(co_obj_t *self, co_obj_t **output, co_obj_t *params)
{
CLEAR_ERR();
svl_crypto_ctx *ctx = NULL;
int list_len = co_list_length(params);
int keypath = 0;
CHECK_ERR(IS_LIST(params) && list_len >= 2, "Invalid params");
if (!strncmp("--keyring=", co_obj_data_ptr(co_list_get_last(params)), 10)) {
keypath = 1;
--list_len;
}
ctx = svl_crypto_ctx_new();
if (co_str_cmp_str(co_list_element(params, 0), "sign") == 0) {
CHECK_ERR(list_len == 2 || list_len == 3, "Invalid arguments");
if (list_len == 3) {
char *sid_str = _LIST_ELEMENT(params, 1);
size_t sid_len = co_str_len(co_list_element(params, 1)) - 1;
CHECK_ERR(sid_len == (2 * SID_SIZE) && str_is_subscriber_id(sid_str) == 1,
"Invalid SID");
stowSid(ctx->sid, 0, sid_str);
ctx->msg = (unsigned char*)_LIST_ELEMENT(params, 2);
ctx->msg_len = co_str_len(co_list_element(params, 2)) - 1;
if (keypath) {
ctx->keyring_path = _LIST_ELEMENT(params, 3) + 10;
ctx->keyring_len = co_str_len(co_list_element(params, 3)) - 11;
CHECK_ERR(ctx->keyring_len < PATH_MAX,"Keyring path too long");
}
} else if (list_len == 2) {
ctx->msg = (unsigned char*)_LIST_ELEMENT(params, 1);
ctx->msg_len = co_str_len(co_list_element(params, 1)) - 1;
if (keypath) {
ctx->keyring_path = _LIST_ELEMENT(params, 2) + 10;
ctx->keyring_len = co_str_len(co_list_element(params, 2)) - 11;
CHECK_ERR(ctx->keyring_len < PATH_MAX,"Keyring path too long");
}
}
CHECK_ERR(cmd_serval_sign(ctx), "Failed to create signature");
// convert ctx->signature, ctx->sas_public, and ctx->sid to hex:
char sid_str[(2 * SID_SIZE) + 1] = {0};
strncpy(sid_str, alloca_tohex(ctx->sid, SID_SIZE), 2 * SID_SIZE);
char sas_str[(2 * crypto_sign_PUBLICKEYBYTES) + 1] = {0};
strncpy(sas_str, alloca_tohex(ctx->sas_public, crypto_sign_PUBLICKEYBYTES), 2 * crypto_sign_PUBLICKEYBYTES);
char sig_str[(2 * SIGNATURE_BYTES) + 1] = {0};
strncpy(sig_str, alloca_tohex(ctx->signature, SIGNATURE_BYTES), 2 * SIGNATURE_BYTES);
CMD_OUTPUT("SID", co_str8_create(sid_str, (2 * SID_SIZE) + 1, 0));
CMD_OUTPUT("SAS", co_str8_create(sas_str, (2 * crypto_sign_PUBLICKEYBYTES) + 1, 0));
CMD_OUTPUT("signature", co_str8_create(sig_str, (2 * SIGNATURE_BYTES) + 1, 0));
} else if (co_str_cmp_str(co_list_element(params, 0), "verify") == 0) {
CHECK_ERR(!keypath, "Keyring option not available for verification");
CHECK_ERR(list_len == 4, "Invalid arguments");
// convert SAS and signature from hex to bin
CHECK_ERR(fromhexstr(ctx->signature, _LIST_ELEMENT(params, 2), SIGNATURE_BYTES) == 0, "Invalid signature");
CHECK_ERR(fromhexstr(ctx->sas_public, _LIST_ELEMENT(params, 1), crypto_sign_PUBLICKEYBYTES) == 0, "Invalid SAS key");
ctx->msg = (unsigned char*)_LIST_ELEMENT(params, 3);
ctx->msg_len = co_str_len(co_list_element(params, 3)) - 1;
int verdict = cmd_serval_verify(ctx);
if (verdict == 1) {
DEBUG("signature verified");
CMD_OUTPUT("result", co_bool_create(true, 0)); // successfully verified
CMD_OUTPUT("verified",co_str8_create("true",sizeof("true"),0));
} else if (verdict == 0) {
DEBUG("signature NOT verified");
CMD_OUTPUT("result", co_bool_create(false, 0));
CMD_OUTPUT("verified",co_str8_create("false",sizeof("false"),0));
}
}
error:
INS_ERROR();
if (ctx)
svl_crypto_ctx_free(ctx);
return 1;
}