Mercurial > hg > nginx
view src/http/modules/ngx_http_gunzip_filter_module.c @ 7732:59e1c73fe02b
SSL: ssl_reject_handshake directive (ticket #195).
In some cases it might be needed to reject SSL handshake based on SNI
server name provided, for example, to make sure an invalid certificate
is not returned to clients trying to contact a name-based virtual server
without SSL configured. Previously, a "ssl_ciphers aNULL;" was used for
this. This workaround, however, is not compatible with TLSv1.3, in
particular, when using BoringSSL, where it is not possible to configure
TLSv1.3 ciphers at all.
With this change, the ssl_reject_handshake directive is introduced,
which instructs nginx to reject SSL handshakes with an "unrecognized_name"
alert in a particular server block.
For example, to reject handshake with names other than example.com,
one can use the following configuration:
server {
listen 443 ssl;
ssl_reject_handshake on;
}
server {
listen 443 ssl;
server_name example.com;
ssl_certificate example.com.crt;
ssl_certificate_key example.com.key;
}
The following configuration can be used to reject all SSL handshakes
without SNI server name provided:
server {
listen 443 ssl;
ssl_reject_handshake on;
}
server {
listen 443 ssl;
server_name ~^;
ssl_certificate example.crt;
ssl_certificate_key example.key;
}
Additionally, the ssl_reject_handshake directive makes configuring
certificates for the default server block optional. If no certificates
are configured in the default server for a given listening socket,
certificates must be defined in all non-default server blocks with
the listening socket in question.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 22 Oct 2020 18:02:28 +0300 |
parents | 973fded4f461 |
children |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Maxim Dounin * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #include <zlib.h> typedef struct { ngx_flag_t enable; ngx_bufs_t bufs; } ngx_http_gunzip_conf_t; typedef struct { ngx_chain_t *in; ngx_chain_t *free; ngx_chain_t *busy; ngx_chain_t *out; ngx_chain_t **last_out; ngx_buf_t *in_buf; ngx_buf_t *out_buf; ngx_int_t bufs; unsigned started:1; unsigned flush:4; unsigned redo:1; unsigned done:1; unsigned nomem:1; z_stream zstream; ngx_http_request_t *request; } ngx_http_gunzip_ctx_t; static ngx_int_t ngx_http_gunzip_filter_inflate_start(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx); static ngx_int_t ngx_http_gunzip_filter_add_data(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx); static ngx_int_t ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx); static ngx_int_t ngx_http_gunzip_filter_inflate(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx); static ngx_int_t ngx_http_gunzip_filter_inflate_end(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx); static void *ngx_http_gunzip_filter_alloc(void *opaque, u_int items, u_int size); static void ngx_http_gunzip_filter_free(void *opaque, void *address); static ngx_int_t ngx_http_gunzip_filter_init(ngx_conf_t *cf); static void *ngx_http_gunzip_create_conf(ngx_conf_t *cf); static char *ngx_http_gunzip_merge_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_command_t ngx_http_gunzip_filter_commands[] = { { ngx_string("gunzip"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_gunzip_conf_t, enable), NULL }, { ngx_string("gunzip_buffers"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_conf_set_bufs_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_gunzip_conf_t, bufs), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_gunzip_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_gunzip_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_gunzip_create_conf, /* create location configuration */ ngx_http_gunzip_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_gunzip_filter_module = { NGX_MODULE_V1, &ngx_http_gunzip_filter_module_ctx, /* module context */ ngx_http_gunzip_filter_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_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; static ngx_int_t ngx_http_gunzip_header_filter(ngx_http_request_t *r) { ngx_http_gunzip_ctx_t *ctx; ngx_http_gunzip_conf_t *conf; conf = ngx_http_get_module_loc_conf(r, ngx_http_gunzip_filter_module); /* TODO support multiple content-codings */ /* TODO always gunzip - due to configuration or module request */ /* TODO ignore content encoding? */ if (!conf->enable || r->headers_out.content_encoding == NULL || r->headers_out.content_encoding->value.len != 4 || ngx_strncasecmp(r->headers_out.content_encoding->value.data, (u_char *) "gzip", 4) != 0) { return ngx_http_next_header_filter(r); } r->gzip_vary = 1; if (!r->gzip_tested) { if (ngx_http_gzip_ok(r) == NGX_OK) { return ngx_http_next_header_filter(r); } } else if (r->gzip_ok) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gunzip_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_gunzip_filter_module); ctx->request = r; r->filter_need_in_memory = 1; r->headers_out.content_encoding->hash = 0; r->headers_out.content_encoding = NULL; ngx_http_clear_content_length(r); ngx_http_clear_accept_ranges(r); ngx_http_weak_etag(r); return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_gunzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { int rc; ngx_uint_t flush; ngx_chain_t *cl; ngx_http_gunzip_ctx_t *ctx; ctx = ngx_http_get_module_ctx(r, ngx_http_gunzip_filter_module); if (ctx == NULL || ctx->done) { return ngx_http_next_body_filter(r, in); } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http gunzip filter"); if (!ctx->started) { if (ngx_http_gunzip_filter_inflate_start(r, ctx) != NGX_OK) { goto failed; } } if (in) { if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { goto failed; } } if (ctx->nomem) { /* flush busy buffers */ if (ngx_http_next_body_filter(r, NULL) == NGX_ERROR) { goto failed; } cl = NULL; ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &cl, (ngx_buf_tag_t) &ngx_http_gunzip_filter_module); ctx->nomem = 0; flush = 0; } else { flush = ctx->busy ? 1 : 0; } for ( ;; ) { /* cycle while we can write to a client */ for ( ;; ) { /* cycle while there is data to feed zlib and ... */ rc = ngx_http_gunzip_filter_add_data(r, ctx); if (rc == NGX_DECLINED) { break; } if (rc == NGX_AGAIN) { continue; } /* ... there are buffers to write zlib output */ rc = ngx_http_gunzip_filter_get_buf(r, ctx); if (rc == NGX_DECLINED) { break; } if (rc == NGX_ERROR) { goto failed; } rc = ngx_http_gunzip_filter_inflate(r, ctx); if (rc == NGX_OK) { break; } if (rc == NGX_ERROR) { goto failed; } /* rc == NGX_AGAIN */ } if (ctx->out == NULL && !flush) { return ctx->busy ? NGX_AGAIN : NGX_OK; } rc = ngx_http_next_body_filter(r, ctx->out); if (rc == NGX_ERROR) { goto failed; } ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out, (ngx_buf_tag_t) &ngx_http_gunzip_filter_module); ctx->last_out = &ctx->out; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gunzip out: %p", ctx->out); ctx->nomem = 0; flush = 0; if (ctx->done) { return rc; } } /* unreachable */ failed: ctx->done = 1; return NGX_ERROR; } static ngx_int_t ngx_http_gunzip_filter_inflate_start(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx) { int rc; ctx->zstream.next_in = Z_NULL; ctx->zstream.avail_in = 0; ctx->zstream.zalloc = ngx_http_gunzip_filter_alloc; ctx->zstream.zfree = ngx_http_gunzip_filter_free; ctx->zstream.opaque = ctx; /* windowBits +16 to decode gzip, zlib 1.2.0.4+ */ rc = inflateInit2(&ctx->zstream, MAX_WBITS + 16); if (rc != Z_OK) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "inflateInit2() failed: %d", rc); return NGX_ERROR; } ctx->started = 1; ctx->last_out = &ctx->out; ctx->flush = Z_NO_FLUSH; return NGX_OK; } static ngx_int_t ngx_http_gunzip_filter_add_data(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx) { if (ctx->zstream.avail_in || ctx->flush != Z_NO_FLUSH || ctx->redo) { return NGX_OK; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gunzip in: %p", ctx->in); if (ctx->in == NULL) { return NGX_DECLINED; } ctx->in_buf = ctx->in->buf; ctx->in = ctx->in->next; ctx->zstream.next_in = ctx->in_buf->pos; ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos; ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gunzip in_buf:%p ni:%p ai:%ud", ctx->in_buf, ctx->zstream.next_in, ctx->zstream.avail_in); if (ctx->in_buf->last_buf || ctx->in_buf->last_in_chain) { ctx->flush = Z_FINISH; } else if (ctx->in_buf->flush) { ctx->flush = Z_SYNC_FLUSH; } else if (ctx->zstream.avail_in == 0) { /* ctx->flush == Z_NO_FLUSH */ return NGX_AGAIN; } return NGX_OK; } static ngx_int_t ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx) { ngx_http_gunzip_conf_t *conf; if (ctx->zstream.avail_out) { return NGX_OK; } conf = ngx_http_get_module_loc_conf(r, ngx_http_gunzip_filter_module); if (ctx->free) { ctx->out_buf = ctx->free->buf; ctx->free = ctx->free->next; ctx->out_buf->flush = 0; } else if (ctx->bufs < conf->bufs.num) { ctx->out_buf = ngx_create_temp_buf(r->pool, conf->bufs.size); if (ctx->out_buf == NULL) { return NGX_ERROR; } ctx->out_buf->tag = (ngx_buf_tag_t) &ngx_http_gunzip_filter_module; ctx->out_buf->recycled = 1; ctx->bufs++; } else { ctx->nomem = 1; return NGX_DECLINED; } ctx->zstream.next_out = ctx->out_buf->pos; ctx->zstream.avail_out = conf->bufs.size; return NGX_OK; } static ngx_int_t ngx_http_gunzip_filter_inflate(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx) { int rc; ngx_buf_t *b; ngx_chain_t *cl; ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "inflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d", ctx->zstream.next_in, ctx->zstream.next_out, ctx->zstream.avail_in, ctx->zstream.avail_out, ctx->flush, ctx->redo); rc = inflate(&ctx->zstream, ctx->flush); if (rc != Z_OK && rc != Z_STREAM_END && rc != Z_BUF_ERROR) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "inflate() failed: %d, %d", ctx->flush, rc); return NGX_ERROR; } ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "inflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d", ctx->zstream.next_in, ctx->zstream.next_out, ctx->zstream.avail_in, ctx->zstream.avail_out, rc); ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gunzip in_buf:%p pos:%p", ctx->in_buf, ctx->in_buf->pos); if (ctx->zstream.next_in) { ctx->in_buf->pos = ctx->zstream.next_in; if (ctx->zstream.avail_in == 0) { ctx->zstream.next_in = NULL; } } ctx->out_buf->last = ctx->zstream.next_out; if (ctx->zstream.avail_out == 0) { /* zlib wants to output some more data */ cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = ctx->out_buf; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; ctx->redo = 1; return NGX_AGAIN; } ctx->redo = 0; if (ctx->flush == Z_SYNC_FLUSH) { ctx->flush = Z_NO_FLUSH; cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } b = ctx->out_buf; if (ngx_buf_size(b) == 0) { b = ngx_calloc_buf(ctx->request->pool); if (b == NULL) { return NGX_ERROR; } } else { ctx->zstream.avail_out = 0; } b->flush = 1; cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; return NGX_OK; } if (ctx->flush == Z_FINISH && ctx->zstream.avail_in == 0) { if (rc != Z_STREAM_END) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "inflate() returned %d on response end", rc); return NGX_ERROR; } if (ngx_http_gunzip_filter_inflate_end(r, ctx) != NGX_OK) { return NGX_ERROR; } return NGX_OK; } if (rc == Z_STREAM_END && ctx->zstream.avail_in > 0) { rc = inflateReset(&ctx->zstream); if (rc != Z_OK) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "inflateReset() failed: %d", rc); return NGX_ERROR; } ctx->redo = 1; return NGX_AGAIN; } if (ctx->in == NULL) { b = ctx->out_buf; if (ngx_buf_size(b) == 0) { return NGX_OK; } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } ctx->zstream.avail_out = 0; cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; return NGX_OK; } return NGX_AGAIN; } static ngx_int_t ngx_http_gunzip_filter_inflate_end(ngx_http_request_t *r, ngx_http_gunzip_ctx_t *ctx) { int rc; ngx_buf_t *b; ngx_chain_t *cl; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gunzip inflate end"); rc = inflateEnd(&ctx->zstream); if (rc != Z_OK) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "inflateEnd() failed: %d", rc); return NGX_ERROR; } b = ctx->out_buf; if (ngx_buf_size(b) == 0) { b = ngx_calloc_buf(ctx->request->pool); if (b == NULL) { return NGX_ERROR; } } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; b->last_buf = (r == r->main) ? 1 : 0; b->last_in_chain = 1; b->sync = 1; ctx->done = 1; return NGX_OK; } static void * ngx_http_gunzip_filter_alloc(void *opaque, u_int items, u_int size) { ngx_http_gunzip_ctx_t *ctx = opaque; ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, "gunzip alloc: n:%ud s:%ud", items, size); return ngx_palloc(ctx->request->pool, items * size); } static void ngx_http_gunzip_filter_free(void *opaque, void *address) { #if 0 ngx_http_gunzip_ctx_t *ctx = opaque; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, "gunzip free: %p", address); #endif } static void * ngx_http_gunzip_create_conf(ngx_conf_t *cf) { ngx_http_gunzip_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gunzip_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->bufs.num = 0; */ conf->enable = NGX_CONF_UNSET; return conf; } static char * ngx_http_gunzip_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_gunzip_conf_t *prev = parent; ngx_http_gunzip_conf_t *conf = child; ngx_conf_merge_value(conf->enable, prev->enable, 0); ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, (128 * 1024) / ngx_pagesize, ngx_pagesize); return NGX_CONF_OK; } static ngx_int_t ngx_http_gunzip_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_gunzip_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_gunzip_body_filter; return NGX_OK; }