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psec-duo-auth.c
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psec-duo-auth.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jansson.h>
#include <argp.h>
#include "libduo/duo.h"
#define PROGRAM_NAME "psec-duo-auth"
#define PROGRAM_VERSION "1.0"
/* Argument parser configuration */
/* argp_program_version is used internally by the argp library */
const char *argp_program_version = PROGRAM_NAME " " PROGRAM_VERSION;
static char doc[] = "Authenticate a user via Duo";
static struct argp_option options[] = {
{"config", 'c', "CFG_FILE", 0, "Configuration file path"},
{"user", 'u', "USER", 0, "Duo username to authenticate"},
{"message", 'm', "MESSAGE", 0, "Message to be displayed in Duo push notification"},
{NULL}
};
struct arguments {
char *cfgPath;
char *message;
char *user;
};
static error_t parse_opt(int key, char *arg, struct argp_state *state)
{
struct arguments *args = state->input;
switch (key) {
case 'c':
args->cfgPath = arg;
break;
case 'u':
args->user = arg;
break;
case 'm':
args->message = arg;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static struct argp argpCfg = {options, parse_opt, NULL, doc};
/* Structure to hold Duo configuration while loading */
typedef struct {
char *apiHost;
char *integrationKey;
char *secretKey;
} psec_duo_config_t;
/* Parse configuration. Expects something like:
* {"duo": {
* "integration_key": "DIxxx",
* "secret_key": "xxxxx",
* "api_host": api-xxx.duosecurity.com"}}
*/
static int parse_duo_config(const char *filename, psec_duo_config_t *psecDuoConfig) {
json_t *jCfg;
json_t *jDuoObj;
json_t *jVal;
jCfg = json_load_file(filename, JSON_REJECT_DUPLICATES, NULL);
if (!jCfg || !json_is_object(jCfg)) {
fprintf(stderr, "Error parsing %s. Must be a valid JSON object.\n", filename);
return -1;
}
jDuoObj = json_object_get(jCfg, "duo");
if (!jDuoObj || !json_is_object(jDuoObj)) {
fprintf(stderr,
"Error parsing %s. Did not contain an object named 'duo'.\n",
filename);
return -1;
}
jVal = json_object_get(jDuoObj, "integration_key");
if (!jVal || !json_is_string(jVal)) {
fprintf(stderr,
"Error parsing %s: No string named 'integration_key' in the 'duo' object.\n",
filename);
return -1;
}
psecDuoConfig->integrationKey = strdup(json_string_value(jVal));
if (!psecDuoConfig->integrationKey) {
fprintf(stderr, "Error: failed to allocate integrationKey.\n");
return -1;
}
jVal = json_object_get(jDuoObj, "secret_key");
if (!jVal || !json_is_string(jVal)) {
fprintf(stderr,
"Error parsing %s: No string named 'secret_key' in the 'duo' object.\n",
filename);
return -1;
}
psecDuoConfig->secretKey = strdup(json_string_value(jVal));
if (!psecDuoConfig->secretKey) {
fprintf(stderr, "Error: failed to allocate secretKey.\n");
return -1;
}
jVal = json_object_get(jDuoObj, "api_host");
if (!jVal || !json_is_string(jVal)) {
fprintf(stderr,
"Error parsing %s: No string named 'api_host' in the 'duo' object.\n",
filename);
return -1;
}
psecDuoConfig->apiHost = strdup(json_string_value(jVal));
if (!psecDuoConfig->apiHost) {
fprintf(stderr, "Error: failed to allocate apiHost.\n");
return -1;
}
json_decref(jCfg);
return 0;
}
/* FreeRADIUS exec exit codes */
/* auth ok */
#define EXIT_OK 0
/* user rejected */
#define EXIT_REJECT 1
/* module failed */
#define EXIT_FAIL 2
int main(int argc, char *argv[])
{
duo_t *duo;
struct duo_auth *duoAuth;
struct duo_push_params duoPushParams;
psec_duo_config_t psecDuoConfig;
struct arguments args;
int argsOk;
int returnCode;
/* set default arguments */
args.cfgPath = NULL;
args.message = NULL;
args.user = NULL;
/* parse arguments */
argp_parse(&argpCfg, argc, argv, 0, 0, &args);
/* validate arguments */
argsOk = 1;
if (args.cfgPath == NULL) {
argsOk = 0;
printf("Configuration path not specified\n");
}
if (args.user == NULL) {
argsOk = 0;
printf("User to authenticate not specified\n");
}
if (!argsOk) {
return EXIT_FAIL;
}
/* Load Duo config file */
if (parse_duo_config(args.cfgPath, &psecDuoConfig) != 0) {
return EXIT_FAIL;
}
duo = duo_init(psecDuoConfig.apiHost,
psecDuoConfig.integrationKey,
psecDuoConfig.secretKey,
PROGRAM_NAME "/" PROGRAM_VERSION,
NULL, /* cafile */
NULL /* proxy */
);
if (!duo) {
fprintf(stderr, "Failed to initialize Duo auth library: %s\n", duo_get_error(duo));
exit(EXIT_FAIL);
}
/* Start wth a preauth */
duoAuth = duo_auth_preauth(duo, args.user);
if (!duoAuth) {
printf("Duo preauth failed: %s\n", duo_get_error(duo));
return EXIT_FAIL;
}
if (0 == strcmp(duoAuth->ok.preauth.result, "allow")) {
/* allow means no Duo auth is required for this user */
printf("%s\n", duoAuth->ok.preauth.status_msg);
return EXIT_OK;
} else if (0 != strcmp(duoAuth->ok.preauth.result, "auth")) {
/* anything other than allow or auth - reject the user */
printf("%s\n", duoAuth->ok.preauth.status_msg);
return EXIT_REJECT;
}
duo_auth_free(duoAuth);
/* Duo auth needed, continue */
duoPushParams.device = "auto";
duoPushParams.type = NULL;
duoPushParams.display_username = NULL;
duoPushParams.pushinfo = NULL;
duoAuth = duo_auth_auth(duo, args.user, "push", NULL, &duoPushParams);
if (!duoAuth) {
printf("Duo auth failed: %s\n", duo_get_error(duo));
return EXIT_FAIL;
}
if (0 == strcmp(duoAuth->ok.auth.result, "allow")) {
/* Authentication succeeded */
printf("Duo authentication succeeded for %s\n", args.user);
return EXIT_OK;
}
/* Authentication failed */
printf("Duo authentication failed for %s\n", args.user);
return EXIT_REJECT;
duo_auth_free(duoAuth);
duo_close(duo);
return returnCode;
}