mirror of
https://github.com/nginx/nginx.git
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355 lines
8.5 KiB
C
355 lines
8.5 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#include <ngx_md5.h>
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typedef struct {
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ngx_http_complex_value_t *variable;
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ngx_http_complex_value_t *md5;
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ngx_str_t secret;
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} ngx_http_secure_link_conf_t;
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typedef struct {
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ngx_str_t expires;
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} ngx_http_secure_link_ctx_t;
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static ngx_int_t ngx_http_secure_link_old_variable(ngx_http_request_t *r,
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ngx_http_secure_link_conf_t *conf, ngx_http_variable_value_t *v,
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uintptr_t data);
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static ngx_int_t ngx_http_secure_link_expires_variable(ngx_http_request_t *r,
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ngx_http_variable_value_t *v, uintptr_t data);
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static void *ngx_http_secure_link_create_conf(ngx_conf_t *cf);
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static char *ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static ngx_int_t ngx_http_secure_link_add_variables(ngx_conf_t *cf);
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static ngx_command_t ngx_http_secure_link_commands[] = {
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{ ngx_string("secure_link"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_set_complex_value_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_secure_link_conf_t, variable),
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NULL },
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{ ngx_string("secure_link_md5"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_set_complex_value_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_secure_link_conf_t, md5),
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NULL },
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{ ngx_string("secure_link_secret"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_str_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_secure_link_conf_t, secret),
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_secure_link_module_ctx = {
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ngx_http_secure_link_add_variables, /* preconfiguration */
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NULL, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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ngx_http_secure_link_create_conf, /* create location configuration */
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ngx_http_secure_link_merge_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_secure_link_module = {
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NGX_MODULE_V1,
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&ngx_http_secure_link_module_ctx, /* module context */
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ngx_http_secure_link_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_str_t ngx_http_secure_link_name = ngx_string("secure_link");
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static ngx_str_t ngx_http_secure_link_expires_name =
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ngx_string("secure_link_expires");
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static ngx_int_t
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ngx_http_secure_link_variable(ngx_http_request_t *r,
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ngx_http_variable_value_t *v, uintptr_t data)
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{
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u_char *p, *last;
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ngx_str_t val, hash;
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time_t expires;
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ngx_md5_t md5;
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ngx_http_secure_link_ctx_t *ctx;
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ngx_http_secure_link_conf_t *conf;
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u_char hash_buf[16], md5_buf[16];
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conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module);
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if (conf->secret.len) {
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return ngx_http_secure_link_old_variable(r, conf, v, data);
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}
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if (conf->variable == NULL || conf->md5 == NULL) {
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goto not_found;
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}
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if (ngx_http_complex_value(r, conf->variable, &val) != NGX_OK) {
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return NGX_ERROR;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"secure link: \"%V\"", &val);
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last = val.data + val.len;
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p = ngx_strlchr(val.data, last, ',');
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expires = 0;
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if (p) {
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val.len = p++ - val.data;
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expires = ngx_atotm(p, last - p);
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if (expires <= 0) {
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goto not_found;
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}
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ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_secure_link_ctx_t));
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if (ctx == NULL) {
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return NGX_ERROR;
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}
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ngx_http_set_ctx(r, ctx, ngx_http_secure_link_module);
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ctx->expires.len = last - p;
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ctx->expires.data = p;
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}
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if (val.len > 24) {
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goto not_found;
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}
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hash.len = 16;
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hash.data = hash_buf;
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if (ngx_decode_base64url(&hash, &val) != NGX_OK) {
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goto not_found;
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}
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if (hash.len != 16) {
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goto not_found;
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}
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if (ngx_http_complex_value(r, conf->md5, &val) != NGX_OK) {
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return NGX_ERROR;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"secure link md5: \"%V\"", &val);
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ngx_md5_init(&md5);
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ngx_md5_update(&md5, val.data, val.len);
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ngx_md5_final(md5_buf, &md5);
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if (ngx_memcmp(hash_buf, md5_buf, 16) != 0) {
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goto not_found;
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}
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v->data = (u_char *) ((expires && expires < ngx_time()) ? "0" : "1");
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v->len = 1;
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v->valid = 1;
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v->no_cacheable = 0;
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v->not_found = 0;
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return NGX_OK;
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not_found:
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v->not_found = 1;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_secure_link_old_variable(ngx_http_request_t *r,
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ngx_http_secure_link_conf_t *conf, ngx_http_variable_value_t *v,
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uintptr_t data)
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{
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u_char *p, *start, *end, *last;
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size_t len;
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ngx_int_t n;
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ngx_uint_t i;
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ngx_md5_t md5;
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u_char hash[16];
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p = &r->unparsed_uri.data[1];
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last = r->unparsed_uri.data + r->unparsed_uri.len;
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while (p < last) {
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if (*p++ == '/') {
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start = p;
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goto md5_start;
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}
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}
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goto not_found;
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md5_start:
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while (p < last) {
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if (*p++ == '/') {
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end = p - 1;
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goto url_start;
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}
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}
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goto not_found;
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url_start:
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len = last - p;
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if (end - start != 32 || len == 0) {
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goto not_found;
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}
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ngx_md5_init(&md5);
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ngx_md5_update(&md5, p, len);
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ngx_md5_update(&md5, conf->secret.data, conf->secret.len);
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ngx_md5_final(hash, &md5);
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for (i = 0; i < 16; i++) {
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n = ngx_hextoi(&start[2 * i], 2);
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if (n == NGX_ERROR || n != hash[i]) {
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goto not_found;
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}
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}
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v->len = len;
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v->valid = 1;
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v->no_cacheable = 0;
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v->not_found = 0;
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v->data = p;
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return NGX_OK;
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not_found:
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v->not_found = 1;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_secure_link_expires_variable(ngx_http_request_t *r,
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ngx_http_variable_value_t *v, uintptr_t data)
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{
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ngx_http_secure_link_ctx_t *ctx;
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ctx = ngx_http_get_module_ctx(r, ngx_http_secure_link_module);
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if (ctx) {
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v->len = ctx->expires.len;
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v->valid = 1;
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v->no_cacheable = 0;
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v->not_found = 0;
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v->data = ctx->expires.data;
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} else {
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v->not_found = 1;
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}
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return NGX_OK;
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}
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static void *
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ngx_http_secure_link_create_conf(ngx_conf_t *cf)
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{
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ngx_http_secure_link_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_link_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->variable = NULL;
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* conf->md5 = NULL;
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* conf->secret = { 0, NULL };
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*/
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return conf;
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}
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static char *
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ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_http_secure_link_conf_t *prev = parent;
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ngx_http_secure_link_conf_t *conf = child;
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ngx_conf_merge_str_value(conf->secret, prev->secret, "");
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if (conf->variable == NULL) {
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conf->variable = prev->variable;
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}
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if (conf->md5 == NULL) {
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conf->md5 = prev->md5;
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}
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return NGX_CONF_OK;
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}
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static ngx_int_t
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ngx_http_secure_link_add_variables(ngx_conf_t *cf)
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{
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ngx_http_variable_t *var;
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var = ngx_http_add_variable(cf, &ngx_http_secure_link_name, 0);
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if (var == NULL) {
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return NGX_ERROR;
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}
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var->get_handler = ngx_http_secure_link_variable;
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var = ngx_http_add_variable(cf, &ngx_http_secure_link_expires_name, 0);
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if (var == NULL) {
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return NGX_ERROR;
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}
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var->get_handler = ngx_http_secure_link_expires_variable;
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return NGX_OK;
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}
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