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nginx/src/http/modules/ngx_http_auth_basic_module.c
Igor Sysoev da173abde0 nginx-0.4.0-RELEASE import 
*) Change in internal API: the HTTP modules initialization was moved
       from the init module phase to the HTTP postconfiguration phase.

    *) Change: now the request body is not read beforehand for the
       ngx_http_perl_module: it's required to start the reading using the
       $r->has_request_body method.

    *) Feature: the ngx_http_perl_module supports the DECLINED return code.

    *) Feature: the ngx_http_dav_module supports the incoming "Date" header
       line for the PUT method.

    *) Feature: the "ssi" directive is available inside the "if" block.

    *) Bugfix: a segmentation fault occurred if there was an "index"
       directive with variables and the first index name was without
       variables; the bug had appeared in 0.1.29.
2006-08-30 10:39:17 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_HTTP_AUTH_BUF_SIZE 2048
typedef struct {
ngx_str_t passwd;
} ngx_http_auth_basic_ctx_t;
typedef struct {
ngx_str_t realm;
ngx_str_t user_file;
} ngx_http_auth_basic_loc_conf_t;
static ngx_int_t ngx_http_auth_basic_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm);
static ngx_int_t ngx_http_auth_basic_set_realm(ngx_http_request_t *r,
ngx_str_t *realm);
static void ngx_http_auth_basic_close(ngx_file_t *file);
static void *ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_auth_basic_init(ngx_conf_t *cf);
static char *ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data);
static ngx_conf_post_handler_pt ngx_http_auth_basic_p = ngx_http_auth_basic;
static ngx_command_t ngx_http_auth_basic_commands[] = {
{ ngx_string("auth_basic"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_auth_basic_loc_conf_t, realm),
&ngx_http_auth_basic_p },
{ ngx_string("auth_basic_user_file"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_auth_basic_loc_conf_t, user_file),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_auth_basic_module_ctx = {
NULL, /* preconfiguration */
ngx_http_auth_basic_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_auth_basic_create_loc_conf, /* create location configuration */
ngx_http_auth_basic_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_auth_basic_module = {
NGX_MODULE_V1,
&ngx_http_auth_basic_module_ctx, /* module context */
ngx_http_auth_basic_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_basic_handler(ngx_http_request_t *r)
{
off_t offset;
ssize_t n;
ngx_fd_t fd;
ngx_int_t rc;
ngx_str_t pwd;
ngx_uint_t i, login, left, passwd;
ngx_file_t file;
ngx_http_auth_basic_ctx_t *ctx;
ngx_http_auth_basic_loc_conf_t *alcf;
u_char buf[NGX_HTTP_AUTH_BUF_SIZE];
enum {
sw_login,
sw_passwd,
sw_skip
} state;
alcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_basic_module);
if (alcf->realm.len == 0 || alcf->user_file.len == 0) {
return NGX_OK;
}
ctx = ngx_http_get_module_ctx(r, ngx_http_auth_basic_module);
if (ctx) {
return ngx_http_auth_basic_crypt_handler(r, ctx, &ctx->passwd,
&alcf->realm);
}
rc = ngx_http_auth_basic_user(r);
if (rc == NGX_DECLINED) {
return ngx_http_auth_basic_set_realm(r, &alcf->realm);
}
if (rc == NGX_ERROR) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
if (fd == NGX_INVALID_FILE) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_open_file_n " \"%s\" failed", alcf->user_file.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_memzero(&file, sizeof(ngx_file_t));
file.fd = fd;
file.name = alcf->user_file;
file.log = r->connection->log;
state = sw_login;
passwd = 0;
login = 0;
left = 0;
offset = 0;
for ( ;; ) {
n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,
offset);
if (n == NGX_ERROR) {
ngx_http_auth_basic_close(&file);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (n == 0) {
break;
}
for (i = left; i < left + n; i++) {
switch (state) {
case sw_login:
if (login == 0 && buf[i] == '#') {
state = sw_skip;
break;
}
if (buf[i] != r->headers_in.user.data[login]) {
state = sw_skip;
break;
}
if (login == r->headers_in.user.len) {
state = sw_passwd;
passwd = i + 1;
}
login++;
break;
case sw_passwd:
if (buf[i] == LF || buf[i] == CR || buf[i] == ':') {
buf[i] = '\0';
ngx_http_auth_basic_close(&file);
pwd.len = i - passwd;
pwd.data = &buf[passwd];
return ngx_http_auth_basic_crypt_handler(r, NULL, &pwd,
&alcf->realm);
}
break;
case sw_skip:
if (buf[i] == LF) {
state = sw_login;
login = 0;
}
break;
}
}
if (state == sw_passwd) {
left = left + n - passwd;
ngx_memcpy(buf, &buf[passwd], left);
passwd = 0;
} else {
left = 0;
}
offset += n;
}
ngx_http_auth_basic_close(&file);
return ngx_http_auth_basic_set_realm(r, &alcf->realm);
}
static ngx_int_t
ngx_http_auth_basic_crypt_handler(ngx_http_request_t *r,
ngx_http_auth_basic_ctx_t *ctx, ngx_str_t *passwd, ngx_str_t *realm)
{
ngx_int_t rc;
u_char *encrypted;
rc = ngx_crypt(r->pool, r->headers_in.passwd.data, passwd->data,
&encrypted);
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"rc: %d user: \"%V\" salt: \"%s\"",
rc, &r->headers_in.user, passwd->data);
if (rc == NGX_OK) {
if (ngx_strcmp(encrypted, passwd->data) == 0) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"encrypted: \"%s\"", encrypted);
return ngx_http_auth_basic_set_realm(r, realm);
}
if (rc == NGX_ERROR) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* rc == NGX_AGAIN */
if (ctx == NULL) {
ctx = ngx_palloc(r->pool, sizeof(ngx_http_auth_basic_ctx_t));
if (ctx == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_http_set_ctx(r, ctx, ngx_http_auth_basic_module);
ctx->passwd.len = passwd->len;
passwd->len++;
ctx->passwd.data = ngx_pstrdup(r->pool, passwd);
if (ctx->passwd.data == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
/* TODO: add mutex event */
return rc;
}
static ngx_int_t
ngx_http_auth_basic_set_realm(ngx_http_request_t *r, ngx_str_t *realm)
{
r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers);
if (r->headers_out.www_authenticate == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
r->headers_out.www_authenticate->hash = 1;
r->headers_out.www_authenticate->key.len = sizeof("WWW-Authenticate") - 1;
r->headers_out.www_authenticate->key.data = (u_char *) "WWW-Authenticate";
r->headers_out.www_authenticate->value = *realm;
return NGX_HTTP_UNAUTHORIZED;
}
static void
ngx_http_auth_basic_close(ngx_file_t *file)
{
if (ngx_close_file(file->fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, file->log, ngx_errno,
ngx_close_file_n " \"%s\" failed", file->name.data);
}
}
static void *
ngx_http_auth_basic_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_auth_basic_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_basic_loc_conf_t));
if (conf == NULL) {
return NGX_CONF_ERROR;
}
return conf;
}
static char *
ngx_http_auth_basic_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_auth_basic_loc_conf_t *prev = parent;
ngx_http_auth_basic_loc_conf_t *conf = child;
if (conf->realm.data == NULL) {
conf->realm = prev->realm;
}
if (conf->user_file.data) {
if (ngx_conf_full_name(cf->cycle, &conf->user_file) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else {
conf->user_file = prev->user_file;
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_auth_basic_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_basic_handler;
return NGX_OK;
}
static char *
ngx_http_auth_basic(ngx_conf_t *cf, void *post, void *data)
{
ngx_str_t *realm = data;
size_t len;
u_char *basic, *p;
if (ngx_strcmp(realm->data, "off") == 0) {
realm->len = 0;
realm->data = (u_char *) "";
return NGX_CONF_OK;
}
len = sizeof("Basic realm=\"") - 1 + realm->len + 1;
basic = ngx_palloc(cf->pool, len);
if (basic == NULL) {
return NGX_CONF_ERROR;
}
p = ngx_cpymem(basic, "Basic realm=\"", sizeof("Basic realm=\"") - 1);
p = ngx_cpymem(p, realm->data, realm->len);
*p = '"';
realm->len = len;
realm->data = basic;
return NGX_CONF_OK;
}
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