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mod_access_token.c
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mod_access_token.c
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#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "http_log.h"
#include "ap_config.h"
#include "apr_sha1.h"
#include "apr_strings.h"
#include "apr_lib.h"
#define ACCESS_KEY_NAME "AccessKey"
#define EXPIRES_NAME "Expires"
#define SIGNATURE_NAME "Signature"
#define BLOCK_SIZE 64
#define ERR(r, ...) ap_log_rerror(APLOG_MARK, \
APLOG_NOERRNO|APLOG_ERR, 0, r, \
__VA_ARGS__)
#define DBG(r, ...) ap_log_rerror(APLOG_MARK, \
APLOG_NOERRNO|APLOG_DEBUG, 0, r, \
__VA_ARGS__)
#define IS_NULL_STR(str) (str == NULL || *str == '\0')
module AP_MODULE_DECLARE_DATA access_token_module;
typedef struct {
apr_int64_t limited;
int check;
char *access_key;
char *secret;
} access_token_config;
static char *hmac_sha1(apr_pool_t *p, char *data, char *key)
{
apr_sha1_ctx_t context;
unsigned char digest[APR_SHA1_DIGESTSIZE];
unsigned char k_ipad[65], k_opad[65];
unsigned char kt[APR_SHA1_DIGESTSIZE];
unsigned char *k = (unsigned char *)key;
int key_len, i;
char *out;
int l, outlen;
key_len = strlen(key);
if(key_len > BLOCK_SIZE) {
k = kt;
key_len = APR_SHA1_DIGESTSIZE;
}
memset((void *)k_ipad, 0, sizeof(k_ipad));
memset((void *)k_opad, 0, sizeof(k_opad));
memmove(k_ipad, k, key_len);
memmove(k_opad, k, key_len);
for (i = 0; i < BLOCK_SIZE; i++) {
k_ipad[i] ^= 0x36;
k_opad[i] ^= 0x5c;
}
apr_sha1_init(&context);
apr_sha1_update_binary(&context, k_ipad, 64);
apr_sha1_update_binary(&context, (const unsigned char *)data, strlen(data));
apr_sha1_final(digest, &context);
apr_sha1_init(&context);
apr_sha1_update_binary(&context, k_opad, 64);
apr_sha1_update_binary(&context, digest, sizeof(digest));
apr_sha1_final(digest, &context);
outlen = apr_base64_encode_len(sizeof(digest));
out = apr_palloc(p, outlen);
l = apr_base64_encode_binary(out, digest, sizeof(digest));
out[l - 2] = '\0';
return out;
}
static void *access_token_create_dir_config(apr_pool_t *p, char *dummy)
{
access_token_config *conf =
(access_token_config *)apr_pcalloc(p, sizeof(access_token_config));
int i;
conf->check = -1;
conf->access_key = NULL;
conf->secret = NULL;
return (void *)conf;
}
static void *access_token_merge_dir_config(apr_pool_t *p, void *basev, void *addv)
{
access_token_config *new = apr_pcalloc(p, sizeof(access_token_config));
access_token_config *base = (access_token_config *)basev;
access_token_config *add = (access_token_config *)addv;
new->check = (add->check != -1) ? add->check : base->check;
new->access_key = add->access_key ? add->access_key : base->access_key;
new->secret = add->secret ? add->secret : base->secret;
return (void *)new;
}
static apr_status_t access_token_parse_args( request_rec *r, apr_table_t *params )
{
const char *args = apr_pstrdup( r->pool, r->args );
char *val;
while(*args && (val = ap_getword(r->pool, &args, '&'))) {
char *name = ap_getword_nc(r->pool, &val, '=');
if(name != NULL && val != NULL) {
if(ap_unescape_url_keep2f(val) == OK)
apr_table_set(params, name, val);
}
}
return APR_SUCCESS;
}
static int check_access_token(request_rec *r)
{
access_token_config *conf =
(access_token_config *)ap_get_module_config(r->per_dir_config, &access_token_module);
apr_table_t *params = apr_table_make( r->pool, 3 );
char *plain;
const char *expires, *access_key, *sig;
const char *check_sig;
int method = r->method_number;
apr_int64_t mmask = (AP_METHOD_BIT << method);
if(conf->check != 1)
return DECLINED;
if(apr_table_get(r->subprocess_env, "no-token-check"))
return DECLINED;
if(IS_NULL_STR(conf->secret) || IS_NULL_STR(conf->access_key)) {
ERR(r, "Configuration error. You MUST specify AccessTokenAccessKey and AccessTokenSecret");
return HTTP_INTERNAL_SERVER_ERROR;
}
if (!(mmask & conf->limited))
return DECLINED;
if (!r->args)
return HTTP_FORBIDDEN;
access_token_parse_args( r, params );
expires = apr_table_get( params, EXPIRES_NAME );
access_key = apr_table_get( params, ACCESS_KEY_NAME );
sig = apr_table_get( params, SIGNATURE_NAME );
if( IS_NULL_STR(expires) || IS_NULL_STR(access_key) || IS_NULL_STR(sig) )
{
ERR(r, "Invalid request arguments %s=%s, %s=%s, %s=%s", ACCESS_KEY_NAME, access_key, EXPIRES_NAME, expires, SIGNATURE_NAME, sig);
return HTTP_FORBIDDEN;
}
if( strcmp(access_key, conf->access_key) != 0 ) {
ERR(r, "%s does not match. %s, %s", ACCESS_KEY_NAME, access_key, conf->access_key );
return HTTP_FORBIDDEN;
}
if(apr_atoi64( expires ) < apr_time_sec( apr_time_now() )) {
ERR(r, "Request has expired");
return HTTP_FORBIDDEN;
}
plain = apr_psprintf(r->pool, "%s%s%s%s", r->method, r->uri, expires, access_key);
check_sig = hmac_sha1(r->pool, plain, conf->secret);
if(strcmp(sig, check_sig) == 0) {
DBG(r, "Signature OK: %s => %s:%s", plain, check_sig, sig);
return OK;
}
else {
ERR(r, "Invalid signature: %s => %s:%s", plain, check_sig, sig);
return HTTP_FORBIDDEN;
}
}
static void access_token_register_hooks(apr_pool_t *p)
{
ap_hook_access_checker(check_access_token,NULL,NULL,APR_HOOK_MIDDLE);
}
static const char *access_token_set_check(cmd_parms *cmd, void *c, int v)
{
access_token_config *conf = (access_token_config *)c;
int i;
conf->check = v;
conf->limited = cmd->limited;
return NULL;
}
static const command_rec access_token_cmds[] = {
AP_INIT_TAKE1("AccessTokenAccessKey", ap_set_string_slot,
(void *)APR_OFFSETOF(access_token_config, access_key),
OR_LIMIT, "set access token access_key value"),
AP_INIT_TAKE1("AccessTokenSecret", ap_set_string_slot,
(void *)APR_OFFSETOF(access_token_config, secret),
OR_LIMIT, "set access token secret value"),
AP_INIT_FLAG("AccessTokenCheck", access_token_set_check,
NULL,
OR_LIMIT, "check access token or NOT"),
{ NULL }
};
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA access_token_module = {
STANDARD20_MODULE_STUFF,
access_token_create_dir_config, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
access_token_cmds, /* table of config file commands */
access_token_register_hooks /* register hooks */
};