diff options
Diffstat (limited to 'src/http/modules/ngx_http_secure_link_module.c')
| -rw-r--r-- | src/http/modules/ngx_http_secure_link_module.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_secure_link_module.c b/src/http/modules/ngx_http_secure_link_module.c new file mode 100644 index 000000000..0b2a4451a --- /dev/null +++ b/src/http/modules/ngx_http_secure_link_module.c @@ -0,0 +1,193 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> +#include <ngx_md5.h> + + +typedef struct { + ngx_str_t secret; +} ngx_http_secure_link_conf_t; + + +static void *ngx_http_secure_link_create_conf(ngx_conf_t *cf); +static char *ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, + void *child); +static ngx_int_t ngx_http_secure_link_add_variables(ngx_conf_t *cf); + + +static ngx_command_t ngx_http_secure_link_commands[] = { + + { ngx_string("secure_link_secret"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_secure_link_conf_t, secret), + NULL }, + + ngx_null_command +}; + + +static ngx_http_module_t ngx_http_secure_link_module_ctx = { + ngx_http_secure_link_add_variables, /* preconfiguration */ + NULL, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_secure_link_create_conf, /* create location configuration */ + ngx_http_secure_link_merge_conf /* merge location configuration */ +}; + + +ngx_module_t ngx_http_secure_link_module = { + NGX_MODULE_V1, + &ngx_http_secure_link_module_ctx, /* module context */ + ngx_http_secure_link_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_str_t ngx_http_secure_link = ngx_string("secure_link"); + + +static ngx_int_t +ngx_http_secure_link_variable(ngx_http_request_t *r, + ngx_http_variable_value_t *v, uintptr_t data) +{ + u_char *p, *start, *end, *last; + size_t len; + ngx_int_t n; + ngx_uint_t i; + ngx_md5_t md5; + ngx_http_secure_link_conf_t *conf; + u_char hash[16]; + + conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_link_module); + + if (conf->secret.len == 0) { + goto not_found; + } + + p = &r->unparsed_uri.data[1]; + last = r->unparsed_uri.data + r->unparsed_uri.len; + + while (p < last) { + if (*p++ == '/') { + start = p; + goto md5_start; + } + } + + goto not_found; + +md5_start: + + while (p < last) { + if (*p++ == '/') { + end = p - 1; + goto url_start; + } + } + + goto not_found; + +url_start: + + len = last - p; + + if (end - start != 32 || len < 3) { + goto not_found; + } + + ngx_md5_init(&md5); + ngx_md5_update(&md5, p, len); + ngx_md5_update(&md5, conf->secret.data, conf->secret.len); + ngx_md5_final(hash, &md5); + + for (i = 0; i < 16; i++) { + n = ngx_hextoi(&start[2 * i], 2); + if (n == NGX_ERROR || n != hash[i]) { + goto not_found; + } + } + + v->len = len; + v->valid = 1; + v->no_cacheable = 0; + v->not_found = 0; + v->data = p; + + return NGX_OK; + +not_found: + + v->not_found = 1; + + return NGX_OK; +} + + +static void * +ngx_http_secure_link_create_conf(ngx_conf_t *cf) +{ + ngx_http_secure_link_conf_t *conf; + + conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_link_conf_t)); + if (conf == NULL) { + return NGX_CONF_ERROR; + } + + /* + * set by ngx_pcalloc(): + * + * conf->secret = { 0, NULL } + */ + + return conf; +} + + +static char * +ngx_http_secure_link_merge_conf(ngx_conf_t *cf, void *parent, void *child) +{ + ngx_http_secure_link_conf_t *prev = parent; + ngx_http_secure_link_conf_t *conf = child; + + ngx_conf_merge_str_value(conf->secret, prev->secret, ""); + + return NGX_CONF_OK; +} + + +static ngx_int_t +ngx_http_secure_link_add_variables(ngx_conf_t *cf) +{ + ngx_http_variable_t *var; + + var = ngx_http_add_variable(cf, &ngx_http_secure_link, NGX_HTTP_VAR_NOHASH); + if (var == NULL) { + return NGX_ERROR; + } + + var->get_handler = ngx_http_secure_link_variable; + + return NGX_OK; +} |