Initial commit
This commit is contained in:
Hakase
@@ -0,0 +1,449 @@
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/*
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* Copyright (C) Nginx, Inc.
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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_stream.h>
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typedef struct {
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ngx_flag_t enabled;
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} ngx_stream_ssl_preread_srv_conf_t;
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typedef struct {
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size_t left;
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size_t size;
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u_char *pos;
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u_char *dst;
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u_char buf[4];
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ngx_str_t host;
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ngx_log_t *log;
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ngx_pool_t *pool;
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ngx_uint_t state;
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} ngx_stream_ssl_preread_ctx_t;
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static ngx_int_t ngx_stream_ssl_preread_handler(ngx_stream_session_t *s);
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static ngx_int_t ngx_stream_ssl_preread_parse_record(
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ngx_stream_ssl_preread_ctx_t *ctx, u_char *pos, u_char *last);
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static ngx_int_t ngx_stream_ssl_preread_server_name_variable(
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ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
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static ngx_int_t ngx_stream_ssl_preread_add_variables(ngx_conf_t *cf);
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static void *ngx_stream_ssl_preread_create_srv_conf(ngx_conf_t *cf);
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static char *ngx_stream_ssl_preread_merge_srv_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static ngx_int_t ngx_stream_ssl_preread_init(ngx_conf_t *cf);
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static ngx_command_t ngx_stream_ssl_preread_commands[] = {
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{ ngx_string("ssl_preread"),
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NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_STREAM_SRV_CONF_OFFSET,
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offsetof(ngx_stream_ssl_preread_srv_conf_t, enabled),
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NULL },
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ngx_null_command
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};
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static ngx_stream_module_t ngx_stream_ssl_preread_module_ctx = {
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ngx_stream_ssl_preread_add_variables, /* preconfiguration */
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ngx_stream_ssl_preread_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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ngx_stream_ssl_preread_create_srv_conf, /* create server configuration */
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ngx_stream_ssl_preread_merge_srv_conf /* merge server configuration */
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};
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ngx_module_t ngx_stream_ssl_preread_module = {
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NGX_MODULE_V1,
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&ngx_stream_ssl_preread_module_ctx, /* module context */
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ngx_stream_ssl_preread_commands, /* module directives */
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NGX_STREAM_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_stream_variable_t ngx_stream_ssl_preread_vars[] = {
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{ ngx_string("ssl_preread_server_name"), NULL,
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ngx_stream_ssl_preread_server_name_variable, 0, 0, 0 },
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ngx_stream_null_variable
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};
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static ngx_int_t
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ngx_stream_ssl_preread_handler(ngx_stream_session_t *s)
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{
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u_char *last, *p;
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size_t len;
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ngx_int_t rc;
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ngx_connection_t *c;
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ngx_stream_ssl_preread_ctx_t *ctx;
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ngx_stream_ssl_preread_srv_conf_t *sscf;
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c = s->connection;
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0, "ssl preread handler");
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sscf = ngx_stream_get_module_srv_conf(s, ngx_stream_ssl_preread_module);
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if (!sscf->enabled) {
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return NGX_DECLINED;
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}
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if (c->type != SOCK_STREAM) {
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return NGX_DECLINED;
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}
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if (c->buffer == NULL) {
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return NGX_AGAIN;
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}
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ctx = ngx_stream_get_module_ctx(s, ngx_stream_ssl_preread_module);
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if (ctx == NULL) {
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ctx = ngx_pcalloc(c->pool, sizeof(ngx_stream_ssl_preread_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_stream_set_ctx(s, ctx, ngx_stream_ssl_preread_module);
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ctx->pool = c->pool;
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ctx->log = c->log;
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ctx->pos = c->buffer->pos;
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}
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p = ctx->pos;
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last = c->buffer->last;
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while (last - p >= 5) {
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if (p[0] != 0x16) {
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: not a handshake");
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return NGX_DECLINED;
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}
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if (p[1] != 3) {
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: unsupported SSL version");
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return NGX_DECLINED;
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}
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len = (p[3] << 8) + p[4];
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/* read the whole record before parsing */
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if ((size_t) (last - p) < len + 5) {
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break;
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}
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p += 5;
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rc = ngx_stream_ssl_preread_parse_record(ctx, p, p + len);
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if (rc != NGX_AGAIN) {
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return rc;
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}
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p += len;
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}
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ctx->pos = p;
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return NGX_AGAIN;
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}
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static ngx_int_t
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ngx_stream_ssl_preread_parse_record(ngx_stream_ssl_preread_ctx_t *ctx,
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u_char *pos, u_char *last)
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{
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size_t left, n, size;
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u_char *dst, *p;
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enum {
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sw_start = 0,
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sw_header, /* handshake msg_type, length */
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sw_head_tail, /* version, random */
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sw_sid_len, /* session_id length */
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sw_sid, /* session_id */
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sw_cs_len, /* cipher_suites length */
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sw_cs, /* cipher_suites */
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sw_cm_len, /* compression_methods length */
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sw_cm, /* compression_methods */
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sw_ext, /* extension */
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sw_ext_header, /* extension_type, extension_data length */
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sw_sni_len, /* SNI length */
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sw_sni_host_head, /* SNI name_type, host_name length */
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sw_sni_host /* SNI host_name */
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} state;
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ngx_log_debug2(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: state %ui left %z", ctx->state, ctx->left);
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state = ctx->state;
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size = ctx->size;
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left = ctx->left;
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dst = ctx->dst;
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p = ctx->buf;
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for ( ;; ) {
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n = ngx_min((size_t) (last - pos), size);
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if (dst) {
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dst = ngx_cpymem(dst, pos, n);
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}
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pos += n;
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size -= n;
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left -= n;
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if (size != 0) {
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break;
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}
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switch (state) {
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case sw_start:
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state = sw_header;
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dst = p;
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size = 4;
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left = size;
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break;
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case sw_header:
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if (p[0] != 1) {
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: not a client hello");
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return NGX_DECLINED;
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}
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state = sw_head_tail;
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dst = NULL;
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size = 34;
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left = (p[1] << 16) + (p[2] << 8) + p[3];
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break;
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case sw_head_tail:
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state = sw_sid_len;
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dst = p;
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size = 1;
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break;
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case sw_sid_len:
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state = sw_sid;
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dst = NULL;
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size = p[0];
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break;
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case sw_sid:
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state = sw_cs_len;
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dst = p;
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size = 2;
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break;
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case sw_cs_len:
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state = sw_cs;
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dst = NULL;
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size = (p[0] << 8) + p[1];
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break;
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case sw_cs:
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state = sw_cm_len;
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dst = p;
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size = 1;
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break;
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case sw_cm_len:
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state = sw_cm;
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dst = NULL;
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size = p[0];
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break;
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case sw_cm:
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if (left == 0) {
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/* no extensions */
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return NGX_OK;
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}
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state = sw_ext;
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dst = p;
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size = 2;
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break;
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case sw_ext:
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if (left == 0) {
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return NGX_OK;
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}
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state = sw_ext_header;
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dst = p;
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size = 4;
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break;
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case sw_ext_header:
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if (p[0] == 0 && p[1] == 0) {
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/* SNI extension */
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state = sw_sni_len;
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dst = NULL;
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size = 2;
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break;
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}
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state = sw_ext;
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dst = NULL;
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size = (p[2] << 8) + p[3];
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break;
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case sw_sni_len:
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state = sw_sni_host_head;
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dst = p;
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size = 3;
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break;
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case sw_sni_host_head:
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if (p[0] != 0) {
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: SNI hostname type is not DNS");
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return NGX_DECLINED;
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}
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state = sw_sni_host;
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size = (p[1] << 8) + p[2];
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ctx->host.data = ngx_pnalloc(ctx->pool, size);
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if (ctx->host.data == NULL) {
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return NGX_ERROR;
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}
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dst = ctx->host.data;
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break;
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case sw_sni_host:
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ctx->host.len = (p[1] << 8) + p[2];
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ngx_log_debug1(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: SNI hostname \"%V\"", &ctx->host);
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return NGX_OK;
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}
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if (left < size) {
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ngx_log_debug0(NGX_LOG_DEBUG_STREAM, ctx->log, 0,
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"ssl preread: failed to parse handshake");
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return NGX_DECLINED;
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}
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}
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ctx->state = state;
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ctx->size = size;
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ctx->left = left;
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ctx->dst = dst;
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return NGX_AGAIN;
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}
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static ngx_int_t
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ngx_stream_ssl_preread_server_name_variable(ngx_stream_session_t *s,
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ngx_variable_value_t *v, uintptr_t data)
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{
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ngx_stream_ssl_preread_ctx_t *ctx;
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ctx = ngx_stream_get_module_ctx(s, ngx_stream_ssl_preread_module);
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if (ctx == NULL) {
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v->not_found = 1;
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return NGX_OK;
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}
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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->len = ctx->host.len;
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v->data = ctx->host.data;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_stream_ssl_preread_add_variables(ngx_conf_t *cf)
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{
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ngx_stream_variable_t *var, *v;
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for (v = ngx_stream_ssl_preread_vars; v->name.len; v++) {
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var = ngx_stream_add_variable(cf, &v->name, v->flags);
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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 = v->get_handler;
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var->data = v->data;
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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_stream_ssl_preread_create_srv_conf(ngx_conf_t *cf)
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{
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ngx_stream_ssl_preread_srv_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_ssl_preread_srv_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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conf->enabled = NGX_CONF_UNSET;
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return conf;
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}
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static char *
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ngx_stream_ssl_preread_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_stream_ssl_preread_srv_conf_t *prev = parent;
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ngx_stream_ssl_preread_srv_conf_t *conf = child;
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ngx_conf_merge_value(conf->enabled, prev->enabled, 0);
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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_stream_ssl_preread_init(ngx_conf_t *cf)
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{
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ngx_stream_handler_pt *h;
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ngx_stream_core_main_conf_t *cmcf;
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cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
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h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREREAD_PHASE].handlers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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*h = ngx_stream_ssl_preread_handler;
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return NGX_OK;
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}
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Block a user