diff options
Diffstat (limited to 'app/nginx/src/http/modules/ngx_http_auth_request_module.c')
| -rw-r--r-- | app/nginx/src/http/modules/ngx_http_auth_request_module.c | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/app/nginx/src/http/modules/ngx_http_auth_request_module.c b/app/nginx/src/http/modules/ngx_http_auth_request_module.c new file mode 100644 index 0000000..bab79e4 --- /dev/null +++ b/app/nginx/src/http/modules/ngx_http_auth_request_module.c @@ -0,0 +1,444 @@ + +/* + * Copyright (C) Maxim Dounin + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +typedef struct { + ngx_str_t uri; + ngx_array_t *vars; +} ngx_http_auth_request_conf_t; + + +typedef struct { + ngx_uint_t done; + ngx_uint_t status; + ngx_http_request_t *subrequest; +} ngx_http_auth_request_ctx_t; + + +typedef struct { + ngx_int_t index; + ngx_http_complex_value_t value; + ngx_http_set_variable_pt set_handler; +} ngx_http_auth_request_variable_t; + + +static ngx_int_t ngx_http_auth_request_handler(ngx_http_request_t *r); +static ngx_int_t ngx_http_auth_request_done(ngx_http_request_t *r, + void *data, ngx_int_t rc); +static ngx_int_t ngx_http_auth_request_set_variables(ngx_http_request_t *r, + ngx_http_auth_request_conf_t *arcf, ngx_http_auth_request_ctx_t *ctx); +static ngx_int_t ngx_http_auth_request_variable(ngx_http_request_t *r, + ngx_http_variable_value_t *v, uintptr_t data); +static void *ngx_http_auth_request_create_conf(ngx_conf_t *cf); +static char *ngx_http_auth_request_merge_conf(ngx_conf_t *cf, + void *parent, void *child); +static ngx_int_t ngx_http_auth_request_init(ngx_conf_t *cf); +static char *ngx_http_auth_request(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf); +static char *ngx_http_auth_request_set(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf); + + +static ngx_command_t ngx_http_auth_request_commands[] = { + + { ngx_string("auth_request"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_http_auth_request, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + { ngx_string("auth_request_set"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, + ngx_http_auth_request_set, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + ngx_null_command +}; + + +static ngx_http_module_t ngx_http_auth_request_module_ctx = { + NULL, /* preconfiguration */ + ngx_http_auth_request_init, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_auth_request_create_conf, /* create location configuration */ + ngx_http_auth_request_merge_conf /* merge location configuration */ +}; + + +ngx_module_t ngx_http_auth_request_module = { + NGX_MODULE_V1, + &ngx_http_auth_request_module_ctx, /* module context */ + ngx_http_auth_request_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_int_t +ngx_http_auth_request_handler(ngx_http_request_t *r) +{ + ngx_table_elt_t *h, *ho; + ngx_http_request_t *sr; + ngx_http_post_subrequest_t *ps; + ngx_http_auth_request_ctx_t *ctx; + ngx_http_auth_request_conf_t *arcf; + + arcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_request_module); + + if (arcf->uri.len == 0) { + return NGX_DECLINED; + } + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "auth request handler"); + + ctx = ngx_http_get_module_ctx(r, ngx_http_auth_request_module); + + if (ctx != NULL) { + if (!ctx->done) { + return NGX_AGAIN; + } + + /* + * as soon as we are done - explicitly set variables to make + * sure they will be available after internal redirects + */ + + if (ngx_http_auth_request_set_variables(r, arcf, ctx) != NGX_OK) { + return NGX_ERROR; + } + + /* return appropriate status */ + + if (ctx->status == NGX_HTTP_FORBIDDEN) { + return ctx->status; + } + + if (ctx->status == NGX_HTTP_UNAUTHORIZED) { + sr = ctx->subrequest; + + h = sr->headers_out.www_authenticate; + + if (!h && sr->upstream) { + h = sr->upstream->headers_in.www_authenticate; + } + + if (h) { + ho = ngx_list_push(&r->headers_out.headers); + if (ho == NULL) { + return NGX_ERROR; + } + + *ho = *h; + + r->headers_out.www_authenticate = ho; + } + + return ctx->status; + } + + if (ctx->status >= NGX_HTTP_OK + && ctx->status < NGX_HTTP_SPECIAL_RESPONSE) + { + return NGX_OK; + } + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "auth request unexpected status: %ui", ctx->status); + + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_auth_request_ctx_t)); + if (ctx == NULL) { + return NGX_ERROR; + } + + ps = ngx_palloc(r->pool, sizeof(ngx_http_post_subrequest_t)); + if (ps == NULL) { + return NGX_ERROR; + } + + ps->handler = ngx_http_auth_request_done; + ps->data = ctx; + + if (ngx_http_subrequest(r, &arcf->uri, NULL, &sr, ps, + NGX_HTTP_SUBREQUEST_WAITED) + != NGX_OK) + { + return NGX_ERROR; + } + + /* + * allocate fake request body to avoid attempts to read it and to make + * sure real body file (if already read) won't be closed by upstream + */ + + sr->request_body = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t)); + if (sr->request_body == NULL) { + return NGX_ERROR; + } + + sr->header_only = 1; + + ctx->subrequest = sr; + + ngx_http_set_ctx(r, ctx, ngx_http_auth_request_module); + + return NGX_AGAIN; +} + + +static ngx_int_t +ngx_http_auth_request_done(ngx_http_request_t *r, void *data, ngx_int_t rc) +{ + ngx_http_auth_request_ctx_t *ctx = data; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "auth request done s:%ui", r->headers_out.status); + + ctx->done = 1; + ctx->status = r->headers_out.status; + + return rc; +} + + +static ngx_int_t +ngx_http_auth_request_set_variables(ngx_http_request_t *r, + ngx_http_auth_request_conf_t *arcf, ngx_http_auth_request_ctx_t *ctx) +{ + ngx_str_t val; + ngx_http_variable_t *v; + ngx_http_variable_value_t *vv; + ngx_http_auth_request_variable_t *av, *last; + ngx_http_core_main_conf_t *cmcf; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "auth request set variables"); + + if (arcf->vars == NULL) { + return NGX_OK; + } + + cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); + v = cmcf->variables.elts; + + av = arcf->vars->elts; + last = av + arcf->vars->nelts; + + while (av < last) { + /* + * explicitly set new value to make sure it will be available after + * internal redirects + */ + + vv = &r->variables[av->index]; + + if (ngx_http_complex_value(ctx->subrequest, &av->value, &val) + != NGX_OK) + { + return NGX_ERROR; + } + + vv->valid = 1; + vv->not_found = 0; + vv->data = val.data; + vv->len = val.len; + + if (av->set_handler) { + /* + * set_handler only available in cmcf->variables_keys, so we store + * it explicitly + */ + + av->set_handler(r, vv, v[av->index].data); + } + + av++; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_auth_request_variable(ngx_http_request_t *r, + ngx_http_variable_value_t *v, uintptr_t data) +{ + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "auth request variable"); + + v->not_found = 1; + + return NGX_OK; +} + + +static void * +ngx_http_auth_request_create_conf(ngx_conf_t *cf) +{ + ngx_http_auth_request_conf_t *conf; + + conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_request_conf_t)); + if (conf == NULL) { + return NULL; + } + + /* + * set by ngx_pcalloc(): + * + * conf->uri = { 0, NULL }; + */ + + conf->vars = NGX_CONF_UNSET_PTR; + + return conf; +} + + +static char * +ngx_http_auth_request_merge_conf(ngx_conf_t *cf, void *parent, void *child) +{ + ngx_http_auth_request_conf_t *prev = parent; + ngx_http_auth_request_conf_t *conf = child; + + ngx_conf_merge_str_value(conf->uri, prev->uri, ""); + ngx_conf_merge_ptr_value(conf->vars, prev->vars, NULL); + + return NGX_CONF_OK; +} + + +static ngx_int_t +ngx_http_auth_request_init(ngx_conf_t *cf) +{ + ngx_http_handler_pt *h; + ngx_http_core_main_conf_t *cmcf; + + cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); + + h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers); + if (h == NULL) { + return NGX_ERROR; + } + + *h = ngx_http_auth_request_handler; + + return NGX_OK; +} + + +static char * +ngx_http_auth_request(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_auth_request_conf_t *arcf = conf; + + ngx_str_t *value; + + if (arcf->uri.data != NULL) { + return "is duplicate"; + } + + value = cf->args->elts; + + if (ngx_strcmp(value[1].data, "off") == 0) { + arcf->uri.len = 0; + arcf->uri.data = (u_char *) ""; + + return NGX_CONF_OK; + } + + arcf->uri = value[1]; + + return NGX_CONF_OK; +} + + +static char * +ngx_http_auth_request_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_auth_request_conf_t *arcf = conf; + + ngx_str_t *value; + ngx_http_variable_t *v; + ngx_http_auth_request_variable_t *av; + ngx_http_compile_complex_value_t ccv; + + value = cf->args->elts; + + if (value[1].data[0] != '$') { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "invalid variable name \"%V\"", &value[1]); + return NGX_CONF_ERROR; + } + + value[1].len--; + value[1].data++; + + if (arcf->vars == NGX_CONF_UNSET_PTR) { + arcf->vars = ngx_array_create(cf->pool, 1, + sizeof(ngx_http_auth_request_variable_t)); + if (arcf->vars == NULL) { + return NGX_CONF_ERROR; + } + } + + av = ngx_array_push(arcf->vars); + if (av == NULL) { + return NGX_CONF_ERROR; + } + + v = ngx_http_add_variable(cf, &value[1], NGX_HTTP_VAR_CHANGEABLE); + if (v == NULL) { + return NGX_CONF_ERROR; + } + + av->index = ngx_http_get_variable_index(cf, &value[1]); + if (av->index == NGX_ERROR) { + return NGX_CONF_ERROR; + } + + if (v->get_handler == NULL) { + v->get_handler = ngx_http_auth_request_variable; + v->data = (uintptr_t) av; + } + + av->set_handler = v->set_handler; + + ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); + + ccv.cf = cf; + ccv.value = &value[2]; + ccv.complex_value = &av->value; + + if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { + return NGX_CONF_ERROR; + } + + return NGX_CONF_OK; +} |