diff options
Diffstat (limited to 'src/http/modules/ngx_http_auth_basic_module.c')
| -rw-r--r-- | src/http/modules/ngx_http_auth_basic_module.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_auth_basic_module.c b/src/http/modules/ngx_http_auth_basic_module.c new file mode 100644 index 000000000..03314b5cf --- /dev/null +++ b/src/http/modules/ngx_http_auth_basic_module.c @@ -0,0 +1,436 @@ + +/* + * 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_cycle_t *cycle); +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_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_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 +}; + + + +ngx_http_module_t ngx_http_auth_basic_module_ctx = { + NULL, /* pre conf */ + + 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, + &ngx_http_auth_basic_module_ctx, /* module context */ + ngx_http_auth_basic_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + ngx_http_auth_basic_init, /* init module */ + NULL /* init process */ +}; + + +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_str_t auth, encoded, pwd; + ngx_uint_t i, login, len, 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); + } + + if (r->headers_in.authorization == NULL) { + return ngx_http_auth_basic_set_realm(r, &alcf->realm); + } + + encoded = r->headers_in.authorization->value; + + if (encoded.len < sizeof("Basic ") - 1 + || ngx_strncasecmp(encoded.data, "Basic ", sizeof("Basic ") - 1) != 0) + { + return ngx_http_auth_basic_set_realm(r, &alcf->realm); + } + + encoded.len -= sizeof("Basic ") - 1; + encoded.data += sizeof("Basic ") - 1; + + while (encoded.len && encoded.data[0] == ' ') { + encoded.len--; + encoded.data++; + } + + if (encoded.len == 0) { + return ngx_http_auth_basic_set_realm(r, &alcf->realm); + } + + auth.len = ngx_base64_decoded_length(encoded.len); + auth.data = ngx_palloc(r->pool, auth.len + 1); + if (auth.data == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (ngx_decode_base64(&auth, &encoded) != NGX_OK) { + return ngx_http_auth_basic_set_realm(r, &alcf->realm); + } + + auth.data[auth.len] = '\0'; + + for (len = 0; len < auth.len; len++) { + if (auth.data[len] == ':') { + break; + } + } + + if (len == auth.len) { + return ngx_http_auth_basic_set_realm(r, &alcf->realm); + } + + r->headers_in.user.len = len; + r->headers_in.user.data = auth.data; + r->headers_in.passwd.len = auth.len - len - 1; + r->headers_in.passwd.data = &auth.data[len + 1]; + + fd = ngx_open_file(alcf->user_file.data, NGX_FILE_RDONLY, NGX_FILE_OPEN); + + if (fd == NGX_INVALID_FILE) { + ngx_log_error(NGX_LOG_ERR, 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] != auth.data[login]) { + state = sw_skip; + break; + } + + if (login == 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->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; + + size_t len; + u_char *realm, *p; + + if (conf->realm.data) { + if (conf->realm.len) { + len = sizeof("Basic realm=\"") - 1 + conf->realm.len + 1; + + realm = ngx_palloc(cf->pool, len); + if (realm == NULL) { + return NGX_CONF_ERROR; + } + + p = ngx_cpymem(realm, "Basic realm=\"", + sizeof("Basic realm=\"") - 1); + p = ngx_cpymem(p, conf->realm.data, conf->realm.len); + *p = '"'; + + conf->realm.len = len; + conf->realm.data = realm; + } + + } else { + 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_cycle_t *cycle) +{ + ngx_http_handler_pt *h; + ngx_http_core_main_conf_t *cmcf; + + cmcf = ngx_http_cycle_get_module_main_conf(cycle, 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; + + if (ngx_strcmp(realm->data, "off") == 0) { + realm->len = 0; + realm->data = (u_char *) ""; + } + + return NGX_CONF_OK; +} |