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#include "config.h"
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <curl/curl.h>
#include "auth_client.h"
static const char *kAuthApiPath = "/api/v1/auth";
struct auth_client {
CURL *c;
const char *service;
const char *server;
};
static void auth_client_set_proto(auth_client_t ac, const char *proto) {
char url[strlen(ac->server) + 32];
sprintf(url, "%s://%s%s", proto, ac->server, kAuthApiPath);
curl_easy_setopt(ac->c, CURLOPT_URL, url);
}
auth_client_t auth_client_new(const char *service, const char *server) {
auth_client_t ac = (auth_client_t)malloc(sizeof(struct auth_client));
ac->service = service;
ac->server = server;
ac->c = curl_easy_init();
curl_easy_setopt(ac->c, CURLOPT_NOSIGNAL, 1);
curl_easy_setopt(ac->c, CURLOPT_TIMEOUT, 60);
auth_client_set_proto(ac, "http");
return ac;
}
void auth_client_set_certificate(auth_client_t ac,
const char *ca_file,
const char *crt_file,
const char *key_file) {
curl_easy_setopt(ac->c, CURLOPT_CAPATH, ca_file);
curl_easy_setopt(ac->c, CURLOPT_SSLCERTTYPE, "PEM");
curl_easy_setopt(ac->c, CURLOPT_SSLCERT, crt_file);
curl_easy_setopt(ac->c, CURLOPT_SSLKEYTYPE, "PEM");
curl_easy_setopt(ac->c, CURLOPT_SSLKEY, key_file);
curl_easy_setopt(ac->c, CURLOPT_SSL_VERIFYPEER, 1);
curl_easy_setopt(ac->c, CURLOPT_SSL_VERIFYHOST, 0);
auth_client_set_proto(ac, "https");
}
void auth_client_free(auth_client_t ac) {
curl_easy_cleanup(ac->c);
free(ac);
}
const char *auth_client_strerror(int err) {
if (err < AC_ERR_CURL_BASE) {
return curl_easy_strerror(auth_client_err_to_curl(err));
}
switch (err) {
case AC_ERR_AUTHENTICATION_FAILURE:
return "Authentication failure";
case AC_ERR_OTP_REQUIRED:
return "OTP required";
default:
return "Unknown error";
}
}
struct responsebuf {
char *buf;
int size;
};
static void responsebuf_init(struct responsebuf *rbuf) {
rbuf->buf = (char *)malloc(1);
rbuf->size = 0;
}
static void responsebuf_free(struct responsebuf *rbuf) {
free(rbuf->buf);
}
static size_t responsebuf_callback(void *contents, size_t size, size_t nmemb, void *userp) {
size_t realsize = size * nmemb;
struct responsebuf *rbuf = (struct responsebuf *)userp;
rbuf->buf = (char *)realloc(rbuf->buf, rbuf->size + realsize + 1);
if (rbuf->buf == NULL) {
return 0;
}
memcpy(rbuf->buf + rbuf->size, contents, realsize);
rbuf->size += realsize;
rbuf->buf[rbuf->size] = 0;
return realsize;
}
int auth_client_authenticate(auth_client_t ac,
const char *username,
const char *password,
const char *otp_token,
const char *source_ip) {
struct curl_httppost *formpost = NULL;
struct curl_httppost *formlast = NULL;
struct responsebuf rbuf;
CURLcode res;
int retval;
// Build the POST request contents.
curl_formadd(&formpost, &formlast,
CURLFORM_COPYNAME, "service",
CURLFORM_COPYCONTENTS, ac->service,
CURLFORM_END);
curl_formadd(&formpost, &formlast,
CURLFORM_COPYNAME, "username",
CURLFORM_COPYCONTENTS, username,
CURLFORM_END);
if (password) {
curl_formadd(&formpost, &formlast,
CURLFORM_COPYNAME, "password",
CURLFORM_COPYCONTENTS, password,
CURLFORM_END);
}
if (otp_token) {
curl_formadd(&formpost, &formlast,
CURLFORM_COPYNAME, "otp",
CURLFORM_COPYCONTENTS, otp_token,
CURLFORM_END);
}
if (source_ip) {
curl_formadd(&formpost, &formlast,
CURLFORM_COPYNAME, "source_ip",
CURLFORM_COPYCONTENTS, source_ip,
CURLFORM_END);
}
curl_easy_setopt(ac->c, CURLOPT_HTTPPOST, formpost);
responsebuf_init(&rbuf);
curl_easy_setopt(ac->c, CURLOPT_WRITEFUNCTION, responsebuf_callback);
curl_easy_setopt(ac->c, CURLOPT_WRITEDATA, (void *)&rbuf);
res = curl_easy_perform(ac->c);
if (res == CURLE_OK) {
// Check the auth server response.
if (!strncmp(rbuf.buf, "OK", 2)) {
retval = AC_OK;
} else if (!strncmp(rbuf.buf, "OTP_REQUIRED", 12)) {
retval = AC_ERR_OTP_REQUIRED;
} else if (!strncmp(rbuf.buf, "ERROR", 5)) {
retval = AC_ERR_AUTHENTICATION_FAILURE;
} else {
retval = AC_ERR_BAD_RESPONSE;
}
} else {
retval = auth_client_err_from_curl(res);
}
curl_formfree(formpost);
responsebuf_free(&rbuf);
return retval;
}