wmantly
cd0cc50a19
Hosts that share one wildcard cert (e.g. hassio.718it.biz and metrics.718it.biz under *.718it.biz) resolve to the same IP, so browsers coalesce them onto a single HTTP/2 connection. The SSL request_domain phase resolves the connection's first host and caches it in ngx.ctx.targetInfo; the unguarded `if targetInfo then return targetInfo` then handed that first host's target to every coalesced request on the connection -- e.g. hassio.718it.biz served from metrics' 192.168.1.8:8088. Confirmed via debug logging: for GET requests to hassio.718it.biz on a coalesced connection, ngx.ctx already held metrics' IP and the function short-circuited to it. Guard the reuse by host: only return the cached target when ngx.ctx.targetInfo_domain matches the requested domain, and record that domain whenever a target is resolved. A coalesced request for a different host now re-resolves against its actual Host header. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
88 lines
2.8 KiB
Lua
88 lines
2.8 KiB
Lua
local M = {}
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-- Function to connect to a Unix socket
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local function connect(path)
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local socket = require("socket.unix")()
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assert(socket:settimeout(.1))
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local status, err = pcall(function() assert(socket:connect(path)) end)
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if status then return true end
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return false
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end
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print("In targetInfo module")
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-- Main function of the module
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function M.get(ngx, domain, targetInfo)
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-- Reuse a previously-resolved target ONLY when it was resolved for this
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-- exact host. HTTP/2 connection coalescing lets a browser serve several
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-- hostnames that share one wildcard cert (e.g. *.718it.biz) over a single
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-- connection; the SSL phase (request_domain) resolves and caches the
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-- connection's first host in ngx.ctx.targetInfo. Without the domain check
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-- below, every coalesced request on that connection would be handed the
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-- first host's target -- e.g. hassio.718it.biz served from metrics.718it.biz.
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if targetInfo and ngx.ctx.targetInfo_domain == domain then
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return targetInfo
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end
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local json = require "cjson"
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local redis = require "resty.redis"
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if not domain then
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ngx.exit(499)
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return false
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end
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local red = redis:new()
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red:set_timeout(1000) -- 1 second
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local ok, err = red:connect("127.0.0.1", 6379)
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if not ok then
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ngx.log(ngx.ERR, "failed to connect to redis: ", err)
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return ngx.exit(598)
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end
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local res, err = red:hgetall("proxy_Host_"..domain)
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res = red:array_to_hash(res)
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-- Return the connection to the pool instead of closing it, so it can be
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-- reused by later requests. Without this a new connection is opened per
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-- request and never released, exhausting sockets under load.
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local ok, err = red:set_keepalive(10000, 100)
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if not ok then
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ngx.log(ngx.ERR, "failed to set redis keepalive: ", err)
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end
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if not res["ip"] then
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if connect("/var/run/proxy_lookup.socket") then
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local socket = require("socket.unix")()
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assert(socket:settimeout(.1))
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assert(socket:connect("/var/run/proxy_lookup.socket"))
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assert(socket:send(json.encode({domain = domain})))
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while true do
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local s, status, partial = socket:receive()
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if partial then
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res = json.decode(partial)
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socket:close()
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break
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end
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end
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end
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end
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if not res["ip"] then
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ngx.exit(406)
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return false
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end
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ngx.ctx.targetInfo = res
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-- Remember which host this target was resolved for, so the reuse guard at
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-- the top can tell a genuine cache hit from a coalesced request for a
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-- different host on the same connection.
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ngx.ctx.targetInfo_domain = domain
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ngx.ctx.toAllow = true
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return res
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end
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return M
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