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mod_authnz_jwt.c
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mod_authnz_jwt.c
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/*
* Copyright 2016 Anthony Deroche <[email protected]>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
// RFC 7519 compliant library
#include "jwt.h"
#include <errno.h>
//JSON library
#include "jansson.h"
#include "apr_strings.h"
#include "apr_lib.h"
#include "apr_base64.h"
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h"
#include "ap_provider.h"
#include "mod_auth.h"
#define JWT_LOGIN_HANDLER "jwt-login-handler"
#define JWT_LOGOUT_HANDLER "jwt-login-handler"
#define USER_INDEX 0
#define PASSWORD_INDEX 1
#define FORM_SIZE 512
#define MAX_KEY_LEN 16384
#define DEFAULT_EXP_DELAY 1800
#define DEFAULT_NBF_DELAY 0
#define DEFAULT_LEEWAY 0
#define DEFAULT_FORM_USERNAME "user"
#define DEFAULT_FORM_PASSWORD "password"
#define DEFAULT_ATTRIBUTE_USERNAME "user"
#define DEFAULT_SIGNATURE_ALGORITHM "HS256"
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CONFIGURATION STRUCTURE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
typedef struct {
authn_provider_list *providers;
const char* signature_algorithm;
int signature_algorithm_set;
const char* signature_shared_secret;
int signature_shared_secret_set;
const char* signature_public_key_file;
int signature_public_key_file_set;
const char* signature_private_key_file;
int signature_private_key_file_set;
int exp_delay;
int exp_delay_set;
int nbf_delay;
int nbf_delay_set;
int leeway;
int leeway_set;
const char* iss;
int iss_set;
const char* aud;
int aud_set;
const char* form_username;
int form_username_set;
const char* form_password;
int form_password_set;
const char* attribute_username;
int attribute_username_set;
char *dir;
} auth_jwt_config_rec;
typedef enum {
dir_signature_algorithm,
dir_signature_shared_secret,
dir_signature_public_key_file,
dir_signature_private_key_file,
dir_exp_delay,
dir_nbf_delay,
dir_iss,
dir_aud,
dir_leeway,
dir_form_username,
dir_form_password,
dir_attribute_username
} jwt_directive;
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FUNCTIONS HEADERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static void *create_auth_jwt_dir_config(apr_pool_t *p, char *d);
static void *create_auth_jwt_config(apr_pool_t * p, server_rec *s);
static void *merge_auth_jwt_dir_config(apr_pool_t *p, void* basev, void* addv);
static void *merge_auth_jwt_config(apr_pool_t *p, void* basev, void* addv);
static void register_hooks(apr_pool_t * p);
static const char *add_authn_provider(cmd_parms * cmd, void *config, const char *arg);
static const char *set_jwt_param(cmd_parms * cmd, void* config, const char* value);
static const char *set_jwt_int_param(cmd_parms * cmd, void* config, const char* value);
static const char* get_config_value(request_rec *r, jwt_directive directive);
static const int get_config_int_value(request_rec *r, jwt_directive directive);
static const char *jwt_parse_config(cmd_parms *cmd, const char *require_line, const void **parsed_require_line);
static authz_status jwtclaim_check_authorization(request_rec *r, const char* require_args, const void *parsed_require_args);
static authz_status jwtclaimarray_check_authorization(request_rec *r, const char* require_args, const void *parsed_require_args);
static const authz_provider authz_jwtclaim_provider = {
&jwtclaim_check_authorization,
&jwt_parse_config
};
static const authz_provider authz_jwtclaimarray_provider = {
&jwtclaimarray_check_authorization,
&jwt_parse_config
};
static int auth_jwt_login_handler(request_rec *r);
static int check_authn(request_rec *r, const char *username, const char *password);
static int create_token(request_rec *r, char** token_str, const char* username);
static int auth_jwt_authn_with_token(request_rec *r);
static void get_encode_key(request_rec* r, const char* algorithm, unsigned char* key);
static void get_decode_key(request_rec* r, unsigned char* key);
static int token_check(request_rec *r, jwt_t **jwt, const char *token, const unsigned char *key);
static int token_decode(jwt_t **jwt, const char* token, const unsigned char *key);
static int token_new(jwt_t **jwt);
static const char* token_get_claim(jwt_t *token, const char* claim);
static long token_get_claim_int(jwt_t *token, const char* claim);
static int token_add_claim(jwt_t *jwt, const char *claim, const char *val);
static int token_add_claim_int(jwt_t *jwt, const char *claim, long val);
static void token_free(jwt_t *token);
static int token_set_alg(request_rec *r, jwt_t *jwt, const char* alg, const unsigned char *key);
static char *token_encode_str(jwt_t *jwt);
static char** token_get_claim_array_of_string(request_rec* r, jwt_t *token, const char* claim, int* len);
static json_t* token_get_claim_array(request_rec* r, jwt_t *token, const char* claim);
static json_t* token_get_claim_json(request_rec* r, jwt_t *token, const char* claim);
static const char* token_get_alg(jwt_t *jwt);
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DECLARE DIRECTIVES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static const command_rec auth_jwt_cmds[] =
{
AP_INIT_TAKE1("AuthJWTSignatureAlgorithm", set_jwt_param, (void *)dir_signature_algorithm, RSRC_CONF|OR_AUTHCFG,
"The algorithm to use to sign tokens"),
AP_INIT_TAKE1("AuthJWTSignatureSharedSecret", set_jwt_param, (void *)dir_signature_shared_secret, RSRC_CONF|OR_AUTHCFG,
"The shared secret to use to sign tokens with HMACs"),
AP_INIT_TAKE1("AuthJWTSignaturePublicKeyFile", set_jwt_param, (void *)dir_signature_public_key_file, RSRC_CONF|OR_AUTHCFG,
"The file containing public key used to check signatures"),
AP_INIT_TAKE1("AuthJWTSignaturePrivateKeyFile", set_jwt_param, (void *)dir_signature_private_key_file, RSRC_CONF|OR_AUTHCFG,
"The file containing private key used to sign tokens"),
AP_INIT_TAKE1("AuthJWTIss", set_jwt_param, (void *)dir_iss, RSRC_CONF|OR_AUTHCFG,
"The issuer of delievered tokens"),
AP_INIT_TAKE1("AuthJWTAud", set_jwt_param, (void *)dir_aud, RSRC_CONF|OR_AUTHCFG,
"The audience of delivered tokens"),
AP_INIT_TAKE1("AuthJWTExpDelay", set_jwt_int_param, (void *)dir_exp_delay, RSRC_CONF|OR_AUTHCFG,
"The time delay in seconds after which delivered tokens are considered invalid"),
AP_INIT_TAKE1("AuthJWTNbfDelay", set_jwt_int_param, (void *)dir_nbf_delay, RSRC_CONF|OR_AUTHCFG,
"The time delay in seconds before which delivered tokens must not be processed"),
AP_INIT_TAKE1("AuthJWTLeeway", set_jwt_int_param, (void *)dir_leeway, RSRC_CONF|OR_AUTHCFG,
"The leeway to account for clock skew in token validation process"),
AP_INIT_ITERATE("AuthJWTProvider", add_authn_provider, NULL, OR_AUTHCFG,
"Specify the auth providers for a directory or location"),
AP_INIT_TAKE1("AuthJWTFormUsername", set_jwt_param, (void *)dir_form_username, RSRC_CONF|OR_AUTHCFG,
"The name of the field containing the username in authentication process"),
AP_INIT_TAKE1("AuthJWTFormPassword", set_jwt_param, (void *)dir_form_password, RSRC_CONF|OR_AUTHCFG,
"The name of the field containing the password in authentication process"),
AP_INIT_TAKE1("AuthJWTAttributeUsername", set_jwt_param, (void *)dir_attribute_username, RSRC_CONF|OR_AUTHCFG,
"The name of the attribute containing the username in the token"),
{NULL}
};
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DEFAULT CONFIGURATION ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
/* PER DIR CONFIGURATION */
static void *create_auth_jwt_dir_config(apr_pool_t *p, char *d){
auth_jwt_config_rec *conf = (auth_jwt_config_rec*) apr_pcalloc(p, sizeof(*conf));
conf->dir = d;
conf->signature_algorithm_set = 0;
conf->signature_shared_secret_set = 0;
conf->signature_public_key_file_set = 0;
conf->signature_private_key_file_set = 0;
conf->exp_delay_set = 0;
conf->nbf_delay_set = 0;
conf->leeway_set = 0;
conf->iss_set = 0;
conf->aud_set = 0;
conf->form_username_set=0;
conf->form_password_set=0;
conf->attribute_username_set=0;
return (void *)conf;
}
/* GLOBAL CONFIGURATION */
static void *create_auth_jwt_config(apr_pool_t * p, server_rec *s){
auth_jwt_config_rec *conf = (auth_jwt_config_rec*) apr_pcalloc(p, sizeof(*conf));
conf->signature_algorithm_set = 0;
conf->signature_shared_secret_set = 0;
conf->signature_public_key_file_set = 0;
conf->signature_private_key_file_set = 0;
conf->exp_delay_set = 0;
conf->nbf_delay_set = 0;
conf->leeway_set = 0;
conf->iss_set = 0;
conf->aud_set = 0;
conf->form_username_set=0;
conf->form_password_set=0;
conf->attribute_username_set=0;
return (void *)conf;
}
static void* merge_auth_jwt_dir_config(apr_pool_t *p, void* basev, void* addv){
auth_jwt_config_rec *base = (auth_jwt_config_rec *)basev;
auth_jwt_config_rec *add = (auth_jwt_config_rec *)addv;
auth_jwt_config_rec *new = (auth_jwt_config_rec *) apr_pcalloc(p, sizeof(auth_jwt_config_rec));
new->providers = !add->providers ? base->providers : add->providers;
new->signature_algorithm = (add->signature_algorithm_set == 0) ? base->signature_algorithm : add->signature_algorithm;
new->signature_algorithm_set = base->signature_algorithm_set || add->signature_algorithm_set;
new->signature_shared_secret = (add->signature_shared_secret_set == 0) ? base->signature_shared_secret : add->signature_shared_secret;
new->signature_shared_secret_set = base->signature_shared_secret_set || add->signature_shared_secret_set;
new->signature_public_key_file = (add->signature_public_key_file_set == 0) ? base->signature_public_key_file : add->signature_public_key_file;
new->signature_public_key_file_set = base->signature_public_key_file_set || add->signature_public_key_file_set;
new->signature_private_key_file = (add->signature_private_key_file_set == 0) ? base->signature_private_key_file : add->signature_private_key_file;
new->signature_private_key_file_set = base->signature_private_key_file_set || add->signature_private_key_file_set;
new->exp_delay = (add->exp_delay_set == 0) ? base->exp_delay : add->exp_delay;
new->exp_delay_set = base->exp_delay_set || add->exp_delay_set;
new->nbf_delay = (add->nbf_delay_set == 0) ? base->nbf_delay : add->nbf_delay;
new->nbf_delay_set = base->nbf_delay_set || add->nbf_delay_set;
new->leeway = (add->leeway_set == 0) ? base->leeway : add->leeway;
new->leeway_set = base->leeway_set || add->leeway_set;
new->iss = (add->iss_set == 0) ? base->iss : add->iss;
new->iss_set = base->iss_set || add->iss_set;
new->aud = (add->aud_set == 0) ? base->aud : add->aud;
new->aud_set = base->aud_set || add->aud_set;
new->form_username = (add->form_username_set == 0) ? base->form_username : add->form_username;
new->form_username_set = base->form_username_set || add->form_username_set;
new->form_password = (add->form_password_set == 0) ? base->form_password : add->form_password;
new->form_password_set = base->form_password_set || add->form_password_set;
new->attribute_username = (add->attribute_username_set == 0) ? base->attribute_username : add->attribute_username;
new->attribute_username_set = base->attribute_username_set || add->attribute_username_set;
return (void*)new;
}
static void* merge_auth_jwt_config(apr_pool_t *p, void* basev, void* addv){
return merge_auth_jwt_dir_config(p, basev, addv);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DECLARE MODULE IN HTTPD CORE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
AP_DECLARE_MODULE(auth_jwt) = {
STANDARD20_MODULE_STUFF,
create_auth_jwt_dir_config,
merge_auth_jwt_dir_config,
create_auth_jwt_config,
merge_auth_jwt_config,
auth_jwt_cmds,
register_hooks
};
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FILL OUT CONF STRUCTURES ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static const char* get_config_value(request_rec *r, jwt_directive directive){
auth_jwt_config_rec *dconf = (auth_jwt_config_rec *) ap_get_module_config(r->per_dir_config, &auth_jwt_module);
auth_jwt_config_rec *sconf = (auth_jwt_config_rec *) ap_get_module_config(r->server->module_config, &auth_jwt_module);
const char* value;
switch ((jwt_directive) directive) {
case dir_signature_algorithm:
if(dconf->signature_algorithm_set && dconf->signature_algorithm){
value = dconf->signature_algorithm;
}else if(sconf->signature_algorithm){
value = sconf->signature_algorithm;
}else{
return DEFAULT_SIGNATURE_ALGORITHM;
}
break;
case dir_signature_shared_secret:
if(dconf->signature_shared_secret_set && dconf->signature_shared_secret){
value = dconf->signature_shared_secret;
}else if(sconf->signature_shared_secret_set && sconf->signature_shared_secret){
value = sconf->signature_shared_secret;
}else{
return NULL;
}
break;
case dir_signature_public_key_file:
if(dconf->signature_public_key_file_set && dconf->signature_public_key_file){
value = dconf->signature_public_key_file;
}else if(sconf->signature_public_key_file_set && sconf->signature_public_key_file){
value = sconf->signature_public_key_file;
}else{
return NULL;
}
break;
case dir_signature_private_key_file:
if(dconf->signature_private_key_file_set && dconf->signature_private_key_file){
value = dconf->signature_private_key_file;
}else if(sconf->signature_private_key_file_set && sconf->signature_private_key_file){
value = sconf->signature_private_key_file;
}else{
return NULL;
}
break;
case dir_iss:
if(dconf->iss_set && dconf->iss){
value = (void*)dconf->iss;
}else if(sconf->iss_set && sconf->iss){
value = (void*)sconf->iss;
}else{
return NULL;
}
break;
case dir_aud:
if(dconf->aud_set && dconf->aud){
value = dconf->aud;
}else if(sconf->iss_set && sconf->aud){
value = sconf->aud;
}else{
return NULL;
}
break;
case dir_form_username:
if(dconf->form_username_set && dconf->form_username){
value = dconf->form_username;
}else if(sconf->form_username_set && sconf->form_username){
value = sconf->form_username;
}else{
return DEFAULT_FORM_USERNAME;
}
break;
case dir_form_password:
if(dconf->form_password_set && dconf->form_password){
value = dconf->form_password;
}else if(sconf->form_password_set && sconf->form_password){
value = sconf->form_password;
}else{
return DEFAULT_FORM_PASSWORD;
}
break;
case dir_attribute_username:
if(dconf->attribute_username_set && dconf->attribute_username){
value = dconf->attribute_username;
}else if(sconf->attribute_username_set && sconf->attribute_username){
value = sconf->attribute_username;
}else{
return DEFAULT_ATTRIBUTE_USERNAME;
}
break;
default:
return NULL;
}
return value;
}
static const int get_config_int_value(request_rec *r, jwt_directive directive){
auth_jwt_config_rec *dconf = (auth_jwt_config_rec *) ap_get_module_config(r->per_dir_config, &auth_jwt_module);
auth_jwt_config_rec *sconf = (auth_jwt_config_rec *) ap_get_module_config(r->server->module_config, &auth_jwt_module);
int value;
switch ((jwt_directive) directive) {
case dir_exp_delay:
if(dconf->exp_delay_set){
value = dconf->exp_delay;
}else if(sconf->exp_delay_set){
value = sconf->exp_delay;
}else{
return DEFAULT_EXP_DELAY;
}
break;
case dir_nbf_delay:
if(dconf->nbf_delay_set){
value = dconf->nbf_delay;
}else if(sconf->nbf_delay_set){
value = sconf->nbf_delay;
}else{
return DEFAULT_NBF_DELAY;
}
break;
case dir_leeway:
if(dconf->leeway){
value = dconf->leeway;
}else if(sconf->leeway_set){
value = sconf->leeway;
}else{
return DEFAULT_LEEWAY;
}
break;
}
return (const int)value;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ REGISTER HOOKS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static void register_hooks(apr_pool_t * p){
ap_hook_handler(auth_jwt_login_handler, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_check_authn(auth_jwt_authn_with_token, NULL, NULL, APR_HOOK_MIDDLE, AP_AUTH_INTERNAL_PER_CONF);
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "jwt-claim", AUTHZ_PROVIDER_VERSION, &authz_jwtclaim_provider, AP_AUTH_INTERNAL_PER_CONF);
ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "jwt-claim-array", AUTHZ_PROVIDER_VERSION, &authz_jwtclaimarray_provider, AP_AUTH_INTERNAL_PER_CONF);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DIRECTIVE HANDLERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static const char *add_authn_provider(cmd_parms * cmd, void *config, const char *arg)
{
auth_jwt_config_rec *conf = (auth_jwt_config_rec *) config;
authn_provider_list *newp;
newp = apr_pcalloc(cmd->pool, sizeof(authn_provider_list));
newp->provider_name = arg;
newp->provider = ap_lookup_provider(AUTHN_PROVIDER_GROUP, newp->provider_name, AUTHN_PROVIDER_VERSION);
if (newp->provider == NULL) {
return apr_psprintf(cmd->pool,"Unknown Authn provider: %s", newp->provider_name);
}
if (!newp->provider->check_password) {
return apr_psprintf(cmd->pool, "The '%s' Authn provider doesn't support JWT authentication", newp->provider_name);
}
if (!conf->providers) {
conf->providers = newp;
}
else {
authn_provider_list *last = conf->providers;
while (last->next) {
last = last->next;
}
last->next = newp;
}
return NULL;
}
static const char *set_jwt_param(cmd_parms * cmd, void* config, const char* value){
auth_jwt_config_rec *conf;
if(!cmd->path){
conf = (auth_jwt_config_rec *) ap_get_module_config(cmd->server->module_config, &auth_jwt_module);
}else{
conf = (auth_jwt_config_rec *) config;
}
switch ((jwt_directive) cmd->info) {
case dir_signature_algorithm:
conf->signature_algorithm = value;
conf->signature_algorithm_set = 1;
break;
case dir_signature_shared_secret:
conf->signature_shared_secret = value;
conf->signature_shared_secret_set = 1;
break;
case dir_signature_public_key_file:
conf->signature_public_key_file = value;
conf->signature_public_key_file_set = 1;
break;
case dir_signature_private_key_file:
conf->signature_private_key_file = value;
conf->signature_private_key_file_set = 1;
break;
case dir_iss:
conf->iss = value;
conf->iss_set = 1;
break;
case dir_aud:
conf->aud = value;
conf->aud_set = 1;
break;
case dir_form_username:
conf->form_username = value;
conf->form_username_set = 1;
break;
case dir_form_password:
conf->form_password = value;
conf->form_password_set = 1;
break;
case dir_attribute_username:
conf->attribute_username = value;
conf->attribute_username_set = 1;
break;
}
return NULL;
}
static const char *set_jwt_int_param(cmd_parms * cmd, void* config, const char* value){
auth_jwt_config_rec *conf;
if(!cmd->path){
conf = (auth_jwt_config_rec *) ap_get_module_config(cmd->server->module_config, &auth_jwt_module);
}else{
conf = (auth_jwt_config_rec *) config;
}
const char *digit;
for (digit = value; *digit; ++digit) {
if (!apr_isdigit(*digit)) {
return "Argument must be numeric!";
}
}
switch ((long) cmd->info) {
case dir_exp_delay:
conf->exp_delay = atoi(value);
conf->exp_delay_set = 1;
break;
case dir_nbf_delay:
conf->nbf_delay = atoi(value);
conf->nbf_delay_set = 1;
break;
case dir_leeway:
conf->leeway = atoi(value);
conf->leeway_set = 1;
break;
}
return NULL;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AUTHZ HANDLERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static const char *jwt_parse_config(cmd_parms *cmd, const char *require_line, const void **parsed_require_line){
const char *expr_err = NULL;
ap_expr_info_t *expr;
expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT, &expr_err, NULL);
if(expr_err)
return apr_pstrcat(cmd->temp_pool, "Cannot parse expression in require line: ", expr_err, NULL);
*parsed_require_line = expr;
return NULL;
}
static authz_status jwtclaim_check_authorization(request_rec *r, const char* require_args, const void *parsed_require_args){
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55100)
"auth_jwt require jwt-claim: checking authorization...");
if(!r->user){
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55101)
"auth_jwt authorize: no user found...");
return AUTHZ_DENIED_NO_USER;
}
const char* err = NULL;
const ap_expr_info_t *expr = parsed_require_args;
const char* require = ap_expr_str_exec(r, expr, &err);
if(err){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55102)
"auth_jwt authorize: require jwt-claim: Can't evaluate expression: %s",err);
return AUTHZ_DENIED;
}
char *w, *value;
while(require[0]){
w = ap_getword(r->pool, &require, '=');
value = ap_getword_conf(r->pool, &require);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55103)
"auth_jwt authorize: checking claim %s has value %s", w, value);
const char* real_value = token_get_claim((jwt_t*)apr_table_get(r->notes, "jwt"), w);
if(real_value != NULL && apr_strnatcasecmp((const char*)real_value, (const char*)value) == 0){
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55104)
"auth_jwt authorize: require jwt-claim: authorization successful for claim %s=%s", w, value);
return AUTHZ_GRANTED;
}else{
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55105)
"auth_jwt authorize: require jwt-claim: authorization failed for claim %s=%s", w, value);
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55106)
"auth_jwt authorize: require jwt-claim: authorization failed");
return AUTHZ_DENIED;
}
static authz_status jwtclaimarray_check_authorization(request_rec *r, const char* require_args, const void *parsed_require_args){
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55107)
"auth_jwt require jwt-claim-array: checking authorization...");
if(!r->user){
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55108)
"auth_jwt authorize: no user found...");
return AUTHZ_DENIED_NO_USER;
}
const char* err = NULL;
const ap_expr_info_t *expr = parsed_require_args;
const char* require = ap_expr_str_exec(r, expr, &err);
if(err){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55109)
"auth_jwt authorize: require jwt-claim: Can't evaluate expression: %s",err);
return AUTHZ_DENIED;
}
char *w, *value;
jwt_t* jwt = (jwt_t*)apr_table_get(r->notes, "jwt");
if(jwt == NULL){
return HTTP_INTERNAL_SERVER_ERROR;
}
while(require[0]){
w = ap_getword(r->pool, &require, '=');
value = ap_getword_conf(r->pool, &require);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55110)
"auth_jwt authorize: checking claim %s has value %s", w, value);
int len;
char** array_values = token_get_claim_array_of_string(r, jwt, w, &len);
if(array_values != NULL){
int i;
for(i=0;i<len;i++){
if(apr_strnatcasecmp((const char*)array_values[i], (const char*)value) == 0){
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55111)
"auth_jwt authorize: require jwt-claim-array: authorization successful for claim %s=%s", w, value);
return AUTHZ_GRANTED;
}else{
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55112)
"auth_jwt authorize: require jwt-claim-array: authorization failed for claim %s=%s", w, value);
}
}
}
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55113)
"auth_jwt authorize: require jwt-claim: authorization failed");
return AUTHZ_DENIED;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AUTHENTICATION HANDLERS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static int auth_jwt_login_handler(request_rec *r){
if(!r->handler || strcmp(r->handler, JWT_LOGIN_HANDLER)){
return DECLINED;
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55200)
"auth_jwt authn: authentication handler is handling authentication");
int res;
char* buffer;
apr_off_t len;
apr_size_t size;
int rv;
if(r->method_number != M_POST){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55201)
"auth_jwt authn: the " JWT_LOGIN_HANDLER " only supports the POST method for %s", r->uri);
return HTTP_METHOD_NOT_ALLOWED;
}
const char* content_type = apr_table_get(r->headers_in, "Content-Type");
if(!content_type || strcmp(content_type, "application/x-www-form-urlencoded")!=0){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55202)
"auth_jwt authn: content type must be x-www-form-urlencoded");
return HTTP_UNSUPPORTED_MEDIA_TYPE;
}
apr_array_header_t *pairs = NULL;
res = ap_parse_form_data(r, NULL, &pairs, -1, FORM_SIZE);
if (res != OK) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55202)
"auth_jwt authn: an error occured while parsing form data, aborting authentication");
return res;
}
char* fields[] = {(char *)get_config_value(r, dir_form_username), (char *)get_config_value(r, dir_form_password)};
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55203)
"auth_jwt authn: reading fields %s and %s", fields[0], fields[1]);
char* sent_values[2];
int i;
while (pairs && !apr_is_empty_array(pairs)) {
ap_form_pair_t *pair = (ap_form_pair_t *) apr_array_pop(pairs);
for(i=0;i<2;i++){
if (fields[i] && !strcmp(pair->name, fields[i]) && &sent_values[i]) {
apr_brigade_length(pair->value, 1, &len);
size = (apr_size_t) len;
buffer = apr_palloc(r->pool, size + 1);
apr_brigade_flatten(pair->value, buffer, &size);
buffer[len] = 0;
sent_values[i] = buffer;
}
}
}
for(i=0;i<2;i++){
if(!sent_values[i]){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55204)
"auth_jwt authn: the expected parameter %s is missing, aborting authentication", fields[i]);
return HTTP_UNAUTHORIZED;
}
}
r->user = sent_values[USER_INDEX];
rv = check_authn(r, sent_values[USER_INDEX], sent_values[PASSWORD_INDEX]);
if(rv == OK){
char* token;
rv = create_token(r, &token, sent_values[USER_INDEX]);
if(rv == OK){
apr_table_setn(r->err_headers_out, "Content-Type", "application/json");
ap_rprintf(r, "{\"token\":\"%s\"}", token);
free(token);
}
}
return rv;
}
static int create_token(request_rec *r, char** token_str, const char* username){
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55300)
"auth_jwt: creating token...");
jwt_t *token;
int allocate = token_new(&token);
if(allocate!=0){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55301)
"auth_jwt create_token: error while creating token: %s", strerror(errno));
return HTTP_INTERNAL_SERVER_ERROR;
}
char* signature_algorithm = (char *)get_config_value(r, dir_signature_algorithm);
unsigned char sign_key[MAX_KEY_LEN] = { 0 };
get_encode_key(r, signature_algorithm, sign_key);
if(strlen((const char*)sign_key) == 0){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55302)
"auth_jwt create_token: key used for signature is empty");
return HTTP_INTERNAL_SERVER_ERROR;
}
char* iss = (char *)get_config_value(r, dir_iss);
char* aud = (char *)get_config_value(r, dir_aud);
int exp_delay = get_config_int_value(r, dir_exp_delay);
int nbf_delay = get_config_int_value(r, dir_nbf_delay);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55305)
"auth_jwt create_token: using algorithm %s...", signature_algorithm);
if(token_set_alg(r, token, signature_algorithm, sign_key)!=0){
return HTTP_INTERNAL_SERVER_ERROR;
}
time_t now = time(NULL);
time_t iat = now;
time_t exp = now;
time_t nbf = now;
if(exp_delay >= 0){
exp += exp_delay;
token_add_claim_int(token, "exp", (long)exp);
}
if(nbf_delay >= 0){
nbf += nbf_delay;
token_add_claim_int(token, "nbf", (long)nbf);
}
token_add_claim_int(token, "iat", (long)iat);
if(iss){
token_add_claim(token, "iss", iss);
}
if(aud){
token_add_claim(token, "aud", aud);
}
const char* username_attribute = (const char *)get_config_value(r, dir_attribute_username);
token_add_claim(token, username_attribute, username);
*token_str = token_encode_str(token);
token_free(token);
return OK;
}
static int check_authn(request_rec *r, const char *username, const char *password){
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55220)
"auth_jwt: authenticating user");
authn_status authn_result;
authn_provider_list *current_provider;
auth_jwt_config_rec *conf = ap_get_module_config(r->per_dir_config, &auth_jwt_module);
current_provider = conf->providers;
do {
const authn_provider *provider;
if (!current_provider) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55221)
"no authn provider configured");
authn_result = AUTH_GENERAL_ERROR;
break;
}
else {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55222)
"auth_jwt authn: using provider %s", current_provider->provider_name);
provider = current_provider->provider;
apr_table_setn(r->notes, AUTHN_PROVIDER_NAME_NOTE, current_provider->provider_name);
}
if (!username || !password) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55223)
"auth_jwt authn: username or password is missing, cannot pursue authentication");
authn_result = AUTH_USER_NOT_FOUND;
break;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55224)
"auth_jwt authn: checking credentials...");
authn_result = provider->check_password(r, username, password);
apr_table_unset(r->notes, AUTHN_PROVIDER_NAME_NOTE);
if (authn_result != AUTH_USER_NOT_FOUND) {
break;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55225)
"auth_jwt authn: no user has been found, trying the next provider...");
if (!conf->providers) {
break;
}
current_provider = current_provider->next;
} while (current_provider);
if (authn_result != AUTH_GRANTED) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55226)
"auth_jwt authn: credentials are not correct");
int return_code;
/*if (authn_result != AUTH_DENIED) && !(conf->authoritative))
return DECLINED;
}*/
switch (authn_result) {
case AUTH_DENIED:
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55227)
"user '%s': authentication failure for \"%s\": "
"password Mismatch",
username, r->uri);
return_code = HTTP_UNAUTHORIZED;
break;
case AUTH_USER_NOT_FOUND:
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55228)
"user '%s' not found: %s", username, r->uri);
return_code = HTTP_UNAUTHORIZED;
break;
case AUTH_GENERAL_ERROR:
default:
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55229)
"auth_jwt authn: an error occured in the authentication provider, aborting authentication");
return_code = HTTP_INTERNAL_SERVER_ERROR;
break;
}
return return_code;
}
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55230)
"auth_jwt authn: credentials are correct");
return OK;
}
/*
If we are configured to handle authentication, let's look up headers to find
whether or not 'Authorization' is set. If so, exepected format is
Authorization: Bearer json_web_token. Then we check if the token is valid.
*/
static int auth_jwt_authn_with_token(request_rec *r){
const char *current_auth = NULL;
current_auth = ap_auth_type(r);
int rv;
if (!current_auth || strcmp(current_auth, "jwt")) {
return DECLINED;
}
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55400)
"auth_jwt: checking authentication with token...");
/* We need an authentication realm. */
if (!ap_auth_name(r)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55401)
"need AuthName: %s", r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
r->ap_auth_type = (char *) current_auth;
ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(55402)
"auth_jwt authn: reading Authorization header...");
char* authorization_header = (char*)apr_table_get( r->headers_in, "Authorization");
char* token_str;
unsigned char key[MAX_KEY_LEN] = { 0 };
get_decode_key(r, key);
if(strlen((const char*)key)==0){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55403)
"auth_jwt authn: key used to check signature is empty");
return HTTP_INTERNAL_SERVER_ERROR;
}
if(!authorization_header){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55404)
"auth_jwt authn: missing Authorization header, responding with WWW-Authenticate header...");
apr_table_setn(r->err_headers_out, "WWW-Authenticate", apr_pstrcat(r->pool, "Bearer realm=\"", ap_auth_name(r),"\"", NULL));
return HTTP_UNAUTHORIZED;
}
int header_len = strlen(authorization_header);
if(header_len > 7 && !strncmp(authorization_header, "Bearer ", 7)){
token_str = authorization_header+7;
jwt_t* token;
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55405)
"auth_jwt authn: checking signature and fields correctness...");
rv = token_check(r, &token, token_str, key);
if(OK == rv){
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55406)
"auth_jwt authn: signature is correct");
const char* found_alg = token_get_alg(token);
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(55405)
"auth_jwt authn: algorithm found is %s", found_alg);
const char* attribute_username = (const char*)get_config_value(r, dir_attribute_username);
char* maybe_user = (char *)token_get_claim(token, attribute_username);
if(maybe_user == NULL){
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(55407)
"Username was not in token ('%s' attribute is expected)", attribute_username);
apr_table_setn(r->err_headers_out, "WWW-Authenticate", apr_pstrcat(r->pool,
"Bearer realm=\"", ap_auth_name(r),"\", error=\"invalid_token\", error_description=\"Username was not in token\"",
NULL));
return HTTP_UNAUTHORIZED;
}
apr_table_setn(r->notes, "jwt", (const char*)token);
r->user = maybe_user;
return OK;
}else{
return rv;
}
if(token)
token_free(token);