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/* Copyright (C) 2019 Jeremy Thien <jeremy.thien@gmail.com>
This file is part of the JWT C Library
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include <stdlib.h>
#include <jwt.h>
#include <getopt.h>
#include <string.h>
#include <time.h>
#include <string.h>
#include <libgen.h>
void usage(const char *name)
{
printf("%s OPTIONS\n", name);
printf("Options:\n"
" -k --key KEY The private key to use for signing\n"
" -a --alg ALG The algorithm to use for signing\n"
" -c --claim KEY=VALUE A claim to add to JWT\n"
" -j --json '{key1:value1}' A json to add to JWT\n"
);
exit(0);
}
int main(int argc, char *argv[])
{
char *opt_key_name = "test-rsa256.pem";
int free_key = 0;
jwt_alg_t opt_alg = JWT_ALG_RS256;
time_t iat = time(NULL);
int oc = 0;
char *optstr = "hk:a:c:j:";
struct option opttbl[] = {
{ "help", no_argument, NULL, 'h' },
{ "key", required_argument, NULL, 'k' },
{ "alg", required_argument, NULL, 'a' },
{ "claim", required_argument, NULL, 'c' },
{ "json", required_argument, NULL, 'j' },
{ NULL, 0, 0, 0 },
};
char *k = NULL, *v = NULL;
int claims_count = 0;
int i = 0;
unsigned char key[10240];
size_t key_len = 0;
FILE *fp_priv_key;
int ret = 0;
jwt_t *jwt = NULL;
struct kv {
char *key;
char *val;
} opt_claims[100];
memset(opt_claims, 0, sizeof(opt_claims));
char* opt_json = NULL;
while ((oc = getopt_long(argc, argv, optstr, opttbl, NULL)) != -1) {
switch (oc) {
case 'k':
opt_key_name = strdup(optarg);
free_key = 1;
break;
case 'a':
opt_alg = jwt_str_alg(optarg);
if (opt_alg == JWT_ALG_INVAL) {
fprintf(stderr, "%s is not supported algorithm, using RS256\n", optarg);
opt_alg = JWT_ALG_RS256;
}
break;
case 'c':
k = strtok(optarg, "=");
if (k) {
v = strtok(NULL, "=");
if (v) {
opt_claims[claims_count].key = strdup(k);
opt_claims[claims_count].val = strdup(v);
claims_count++;
}
}
break;
case 'j':
if (optarg != NULL) {
opt_json = strdup(optarg);
}
break;
case 'h':
usage(basename(argv[0]));
return 0;
default: /* '?' */
usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
}
fprintf(stderr, "jwtgen: privkey %s algorithm %s\n",
opt_key_name, jwt_alg_str(opt_alg));
if (opt_alg > JWT_ALG_NONE) {
fp_priv_key = fopen(opt_key_name, "r");
if (fp_priv_key == NULL) {
perror("Failed to open key file");
goto finish;
}
key_len = fread(key, 1, sizeof(key), fp_priv_key);
fclose(fp_priv_key);
key[key_len] = '\0';
fprintf(stderr, "priv key loaded %s (%zu)!\n", opt_key_name, key_len);
}
ret = jwt_new(&jwt);
if (ret != 0 || jwt == NULL) {
fprintf(stderr, "invalid jwt\n");
goto finish;
}
ret = jwt_add_grant_int(jwt, "iat", iat);
for (i = 0; i < claims_count; i++) {
fprintf(stderr, "Adding claim %s with value %s\n", opt_claims[i].key, opt_claims[i].val);
jwt_add_grant(jwt, opt_claims[i].key, opt_claims[i].val);
}
if (opt_json != NULL) {
ret = jwt_add_grants_json(jwt, opt_json);
if (ret != 0) {
fprintf(stderr, "Input json is invalid\n");
goto finish;
}
}
ret = jwt_set_alg(jwt, opt_alg, opt_alg == JWT_ALG_NONE ? NULL : key, opt_alg == JWT_ALG_NONE ? 0 : key_len);
if (ret < 0) {
fprintf(stderr, "jwt incorrect algorithm\n");
goto finish;
}
jwt_dump_fp(jwt, stderr, 1);
fprintf(stderr, "jwt algo %s!\n", jwt_alg_str(opt_alg));
char *out = jwt_encode_str(jwt);
printf("%s\n", out);
jwt_free_str(out);
finish:
if (opt_json != NULL)
free(opt_json);
jwt_free(jwt);
if (free_key)
free(opt_key_name);
return 0;
}
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