Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_tokens.c @ 9299:2706b60dc225 default tip
Core: error logging rate limiting.
With this change, error logging to files can be rate-limited with
the "rate=" parameter. The parameter specifies allowed log messages
rate to a particular file (per worker), in messages per second (m/s).
By default, "rate=1000m/s" is used.
Rate limiting is implemented using the "leaky bucket" method, similarly
to the limit_req module.
Maximum burst size is set to the number of log messages per second
for each severity level, so "error" messages are logged even if the
rate limit is hit by "info" messages (but not vice versa). When the
limit is reached for a particular level, the "too many log messages,
limiting" message is logged at this level.
If debug logging is enabled, either for the particular log file or for
the particular connection, rate limiting is not used.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 25 Jun 2024 22:58:56 +0300 |
parents | 77c1418916f7 |
children |
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/* * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_sha1.h> #include <ngx_event_quic_connection.h> static void ngx_quic_address_hash(struct sockaddr *sockaddr, socklen_t socklen, ngx_uint_t no_port, u_char buf[20]); ngx_int_t ngx_quic_new_sr_token(ngx_connection_t *c, ngx_str_t *cid, u_char *secret, u_char *token) { ngx_str_t tmp; tmp.data = secret; tmp.len = NGX_QUIC_SR_KEY_LEN; if (ngx_quic_derive_key(c->log, "sr_token_key", &tmp, cid, token, NGX_QUIC_SR_TOKEN_LEN) != NGX_OK) { return NGX_ERROR; } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic stateless reset token %*xs", (size_t) NGX_QUIC_SR_TOKEN_LEN, token); return NGX_OK; } ngx_int_t ngx_quic_new_token(ngx_log_t *log, struct sockaddr *sockaddr, socklen_t socklen, u_char *key, ngx_str_t *token, ngx_str_t *odcid, time_t exp, ngx_uint_t is_retry) { int len, iv_len; u_char *p, *iv; EVP_CIPHER_CTX *ctx; const EVP_CIPHER *cipher; u_char in[NGX_QUIC_MAX_TOKEN_SIZE]; ngx_quic_address_hash(sockaddr, socklen, !is_retry, in); p = in + 20; p = ngx_cpymem(p, &exp, sizeof(time_t)); *p++ = is_retry ? 1 : 0; if (odcid) { *p++ = odcid->len; p = ngx_cpymem(p, odcid->data, odcid->len); } else { *p++ = 0; } len = p - in; cipher = EVP_aes_256_gcm(); iv_len = NGX_QUIC_AES_256_GCM_IV_LEN; if ((size_t) (iv_len + len + NGX_QUIC_AES_256_GCM_TAG_LEN) > token->len) { ngx_log_error(NGX_LOG_ALERT, log, 0, "quic token buffer is too small"); return NGX_ERROR; } ctx = EVP_CIPHER_CTX_new(); if (ctx == NULL) { return NGX_ERROR; } iv = token->data; if (RAND_bytes(iv, iv_len) <= 0 || !EVP_EncryptInit_ex(ctx, cipher, NULL, key, iv)) { EVP_CIPHER_CTX_free(ctx); return NGX_ERROR; } token->len = iv_len; if (EVP_EncryptUpdate(ctx, token->data + token->len, &len, in, len) != 1) { EVP_CIPHER_CTX_free(ctx); return NGX_ERROR; } token->len += len; if (EVP_EncryptFinal_ex(ctx, token->data + token->len, &len) <= 0) { EVP_CIPHER_CTX_free(ctx); return NGX_ERROR; } token->len += len; if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, NGX_QUIC_AES_256_GCM_TAG_LEN, token->data + token->len) == 0) { EVP_CIPHER_CTX_free(ctx); return NGX_ERROR; } token->len += NGX_QUIC_AES_256_GCM_TAG_LEN; EVP_CIPHER_CTX_free(ctx); #ifdef NGX_QUIC_DEBUG_PACKETS ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0, "quic new token len:%uz %xV", token->len, token); #endif return NGX_OK; } static void ngx_quic_address_hash(struct sockaddr *sockaddr, socklen_t socklen, ngx_uint_t no_port, u_char buf[20]) { size_t len; u_char *data; ngx_sha1_t sha1; struct sockaddr_in *sin; #if (NGX_HAVE_INET6) struct sockaddr_in6 *sin6; #endif len = (size_t) socklen; data = (u_char *) sockaddr; if (no_port) { switch (sockaddr->sa_family) { #if (NGX_HAVE_INET6) case AF_INET6: sin6 = (struct sockaddr_in6 *) sockaddr; len = sizeof(struct in6_addr); data = sin6->sin6_addr.s6_addr; break; #endif case AF_INET: sin = (struct sockaddr_in *) sockaddr; len = sizeof(in_addr_t); data = (u_char *) &sin->sin_addr; break; } } ngx_sha1_init(&sha1); ngx_sha1_update(&sha1, data, len); ngx_sha1_final(buf, &sha1); } ngx_int_t ngx_quic_validate_token(ngx_connection_t *c, u_char *key, ngx_quic_header_t *pkt) { int len, tlen, iv_len; u_char *iv, *p; time_t now, exp; size_t total; ngx_str_t odcid; EVP_CIPHER_CTX *ctx; const EVP_CIPHER *cipher; u_char addr_hash[20]; u_char tdec[NGX_QUIC_MAX_TOKEN_SIZE]; #if NGX_SUPPRESS_WARN ngx_str_null(&odcid); #endif /* Retry token or NEW_TOKEN in a previous connection */ cipher = EVP_aes_256_gcm(); iv = pkt->token.data; iv_len = NGX_QUIC_AES_256_GCM_IV_LEN; /* sanity checks */ if (pkt->token.len < (size_t) iv_len + NGX_QUIC_AES_256_GCM_TAG_LEN) { goto garbage; } if (pkt->token.len > (size_t) iv_len + NGX_QUIC_MAX_TOKEN_SIZE + NGX_QUIC_AES_256_GCM_TAG_LEN) { goto garbage; } ctx = EVP_CIPHER_CTX_new(); if (ctx == NULL) { return NGX_ERROR; } if (!EVP_DecryptInit_ex(ctx, cipher, NULL, key, iv)) { EVP_CIPHER_CTX_free(ctx); return NGX_ERROR; } p = pkt->token.data + iv_len; len = pkt->token.len - iv_len - NGX_QUIC_AES_256_GCM_TAG_LEN; if (EVP_DecryptUpdate(ctx, tdec, &tlen, p, len) != 1) { EVP_CIPHER_CTX_free(ctx); goto garbage; } total = tlen; if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, NGX_QUIC_AES_256_GCM_TAG_LEN, p + len) == 0) { EVP_CIPHER_CTX_free(ctx); goto garbage; } if (EVP_DecryptFinal_ex(ctx, tdec + tlen, &tlen) <= 0) { EVP_CIPHER_CTX_free(ctx); goto garbage; } total += tlen; EVP_CIPHER_CTX_free(ctx); if (total < (20 + sizeof(time_t) + 2)) { goto garbage; } p = tdec + 20; ngx_memcpy(&exp, p, sizeof(time_t)); p += sizeof(time_t); pkt->retried = (*p++ == 1); ngx_quic_address_hash(c->sockaddr, c->socklen, !pkt->retried, addr_hash); if (ngx_memcmp(tdec, addr_hash, 20) != 0) { goto bad_token; } odcid.len = *p++; if (odcid.len) { if (odcid.len > NGX_QUIC_MAX_CID_LEN) { goto bad_token; } if ((size_t)(tdec + total - p) < odcid.len) { goto bad_token; } odcid.data = p; } now = ngx_time(); if (now > exp) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic expired token"); return NGX_DECLINED; } if (odcid.len) { pkt->odcid.len = odcid.len; pkt->odcid.data = pkt->odcid_buf; ngx_memcpy(pkt->odcid.data, odcid.data, odcid.len); } else { pkt->odcid = pkt->dcid; } pkt->validated = 1; return NGX_OK; garbage: ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic garbage token"); return NGX_ABORT; bad_token: ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic invalid token"); return NGX_DECLINED; }