app/{vmagent,vminsert}: add ability to restrict access to /config page with authKey query arg

The authKey can be configured via `-configAuthKey` command-line flag.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1764

app/vmagent/README.md

@@ -707,6 +707,8 @@ vmagent collects metrics data via popular data ingestion protocols and routes th
 
 See the docs at https://docs.victoriametrics.com/vmagent.html .
 
+  -configAuthKey string
+    	Authorization key for accessing /config page. It must be passed via authKey query arg
   -csvTrimTimestamp duration
     	Trim timestamps when importing csv data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -datadog.maxInsertRequestSize size
@@ -790,7 +792,7 @@ See the docs at https://docs.victoriametrics.com/vmagent.html .
   -memory.allowedPercent float
     	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low a value may increase cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache which will result in higher disk IO usage (default 60)
   -metricsAuthKey string
-    	Auth key for /metrics. It overrides httpAuth settings
+    	Auth key for /metrics. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -opentsdbHTTPListenAddr string
     	TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty
   -opentsdbListenAddr string
@@ -803,7 +805,7 @@ See the docs at https://docs.victoriametrics.com/vmagent.html .
   -opentsdbhttpTrimTimestamp duration
     	Trim timestamps for OpenTSDB HTTP data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -pprofAuthKey string
-    	Auth key for /debug/pprof. It overrides httpAuth settings
+    	Auth key for /debug/pprof. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -promscrape.cluster.memberNum int
     	The number of number in the cluster of scrapers. It must be an unique value in the range 0 ... promscrape.cluster.membersCount-1 across scrapers in the cluster
   -promscrape.cluster.membersCount int

app/vmagent/main.go

@@ -50,6 +50,7 @@ var (
 		"Telnet put messages and HTTP /api/put messages are simultaneously served on TCP port. "+
 		"Usually :4242 must be set. Doesn't work if empty")
 	opentsdbHTTPListenAddr = flag.String("opentsdbHTTPListenAddr", "", "TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty")
+	configAuthKey          = flag.String("configAuthKey", "", "Authorization key for accessing /config page. It must be passed via authKey query arg")
 	dryRun                 = flag.Bool("dryRun", false, "Whether to check only config files without running vmagent. The following files are checked: "+
 		"-promscrape.config, -remoteWrite.relabelConfig, -remoteWrite.urlRelabelConfig . "+
 		"Unknown config entries are allowed in -promscrape.config by default. This can be changed with -promscrape.config.strictParse")
@@ -262,6 +263,14 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		promscrape.WriteHumanReadableTargetsStatus(w, r)
 		return true
 	case "/config":
+		if *configAuthKey != "" && r.FormValue("authKey") != *configAuthKey {
+			err := &httpserver.ErrorWithStatusCode{
+				Err:        fmt.Errorf("The provided authKey doesn't match -configAuthKey"),
+				StatusCode: http.StatusUnauthorized,
+			}
+			httpserver.Errorf(w, r, "%s", err)
+			return true
+		}
 		promscrapeConfigRequests.Inc()
 		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		promscrape.WriteConfigData(w)

docs/CHANGELOG.md

@@ -9,6 +9,7 @@ sort: 15
 * FEATURE: vmalert: allow groups with empty rules list like Prometheus does. See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/1742).
 * FEATURE: vmagent: add `collapse` and `expand` buttons per each group of targets with the same `job_name` at `http://vmagent:8429/targets` page.
 * FEATURE: automatically detect timestamp precision (ns, us, ms or s) for the data ingested into VictoriaMetrics via [InfluxDB line protocol](https://docs.victoriametrics.com/#how-to-send-data-from-influxdb-compatible-agents-such-as-telegraf).
+* FEATURE: vmagent: add ability to protect `/config` page with auth key via `-configAuthKey` command-line flag. This page may contain sensitive information such as passwords, so it may be good to restrict access to this page. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1764).
 
 * BUGFIX: vmagent: properly display `proxy_url` config option at `http://vmagent:8429/config` page. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1755).
 * BUGFIX: fix tests for Apple M1. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1653).

docs/README.md

@@ -1213,6 +1213,7 @@ Consider setting the following command-line flags:
 * `-snapshotAuthKey` for protecting `/snapshot*` endpoints. See [how to work with snapshots](#how-to-work-with-snapshots).
 * `-forceMergeAuthKey` for protecting `/internal/force_merge` endpoint. See [force merge docs](#forced-merge).
 * `-search.resetCacheAuthKey` for protecting `/internal/resetRollupResultCache` endpoint. See [backfilling](#backfilling) for more details.
+* `-configAuthKey` for pretecting `/config` endpoint, since it may contain sensitive information such as passwords.
 
 Explicitly set internal network interface for TCP and UDP ports for data ingestion with Graphite and OpenTSDB formats.
 For example, substitute `-graphiteListenAddr=:2003` with `-graphiteListenAddr=<internal_iface_ip>:2003`.
@@ -1549,6 +1550,8 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
 ```
   -bigMergeConcurrency int
     	The maximum number of CPU cores to use for big merges. Default value is used if set to 0
+  -configAuthKey string
+    	Authorization key for accessing /config page. It must be passed via authKey query arg
   -csvTrimTimestamp duration
     	Trim timestamps when importing csv data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -datadog.maxInsertRequestSize size
@@ -1648,7 +1651,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
   -memory.allowedPercent float
     	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low a value may increase cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache which will result in higher disk IO usage (default 60)
   -metricsAuthKey string
-    	Auth key for /metrics. It overrides httpAuth settings
+    	Auth key for /metrics. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -opentsdbHTTPListenAddr string
     	TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty
   -opentsdbListenAddr string
@@ -1661,7 +1664,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
   -opentsdbhttpTrimTimestamp duration
     	Trim timestamps for OpenTSDB HTTP data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -pprofAuthKey string
-    	Auth key for /debug/pprof. It overrides httpAuth settings
+    	Auth key for /debug/pprof. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -precisionBits int
     	The number of precision bits to store per each value. Lower precision bits improves data compression at the cost of precision loss (default 64)
   -promscrape.cluster.memberNum int

docs/Single-server-VictoriaMetrics.md

@@ -1217,6 +1217,7 @@ Consider setting the following command-line flags:
 * `-snapshotAuthKey` for protecting `/snapshot*` endpoints. See [how to work with snapshots](#how-to-work-with-snapshots).
 * `-forceMergeAuthKey` for protecting `/internal/force_merge` endpoint. See [force merge docs](#forced-merge).
 * `-search.resetCacheAuthKey` for protecting `/internal/resetRollupResultCache` endpoint. See [backfilling](#backfilling) for more details.
+* `-configAuthKey` for pretecting `/config` endpoint, since it may contain sensitive information such as passwords.
 
 Explicitly set internal network interface for TCP and UDP ports for data ingestion with Graphite and OpenTSDB formats.
 For example, substitute `-graphiteListenAddr=:2003` with `-graphiteListenAddr=<internal_iface_ip>:2003`.
@@ -1553,6 +1554,8 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
 ```
   -bigMergeConcurrency int
     	The maximum number of CPU cores to use for big merges. Default value is used if set to 0
+  -configAuthKey string
+    	Authorization key for accessing /config page. It must be passed via authKey query arg
   -csvTrimTimestamp duration
     	Trim timestamps when importing csv data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -datadog.maxInsertRequestSize size
@@ -1652,7 +1655,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
   -memory.allowedPercent float
     	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low a value may increase cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache which will result in higher disk IO usage (default 60)
   -metricsAuthKey string
-    	Auth key for /metrics. It overrides httpAuth settings
+    	Auth key for /metrics. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -opentsdbHTTPListenAddr string
     	TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty
   -opentsdbListenAddr string
@@ -1665,7 +1668,7 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li
   -opentsdbhttpTrimTimestamp duration
     	Trim timestamps for OpenTSDB HTTP data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -pprofAuthKey string
-    	Auth key for /debug/pprof. It overrides httpAuth settings
+    	Auth key for /debug/pprof. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -precisionBits int
     	The number of precision bits to store per each value. Lower precision bits improves data compression at the cost of precision loss (default 64)
   -promscrape.cluster.memberNum int

docs/vmagent.md

@@ -711,6 +711,8 @@ vmagent collects metrics data via popular data ingestion protocols and routes th
 
 See the docs at https://docs.victoriametrics.com/vmagent.html .
 
+  -configAuthKey string
+    	Authorization key for accessing /config page. It must be passed via authKey query arg
   -csvTrimTimestamp duration
     	Trim timestamps when importing csv data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -datadog.maxInsertRequestSize size
@@ -794,7 +796,7 @@ See the docs at https://docs.victoriametrics.com/vmagent.html .
   -memory.allowedPercent float
     	Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low a value may increase cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache which will result in higher disk IO usage (default 60)
   -metricsAuthKey string
-    	Auth key for /metrics. It overrides httpAuth settings
+    	Auth key for /metrics. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -opentsdbHTTPListenAddr string
     	TCP address to listen for OpentTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty
   -opentsdbListenAddr string
@@ -807,7 +809,7 @@ See the docs at https://docs.victoriametrics.com/vmagent.html .
   -opentsdbhttpTrimTimestamp duration
     	Trim timestamps for OpenTSDB HTTP data to this duration. Minimum practical duration is 1ms. Higher duration (i.e. 1s) may be used for reducing disk space usage for timestamp data (default 1ms)
   -pprofAuthKey string
-    	Auth key for /debug/pprof. It overrides httpAuth settings
+    	Auth key for /debug/pprof. It must be passed via authKey query arg. It overrides httpAuth.* settings
   -promscrape.cluster.memberNum int
     	The number of number in the cluster of scrapers. It must be an unique value in the range 0 ... promscrape.cluster.membersCount-1 across scrapers in the cluster
   -promscrape.cluster.membersCount int