Adding TLS to node exporter - cleaner version

.circleci/config.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
     - checkout
     - run: sudo pip install codespell
-    - run: codespell --skip=".git,./vendor,ttar,go.mod,go.sum" -L uint,packages\',uptodate
+    - run: codespell --skip=".git,./vendor,ttar,go.mod,go.sum,*pem" -L uint,packages\',uptodate
 
   build:
     machine:

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/mattn/go-xmlrpc v0.0.1
 	github.com/mdlayher/genetlink v0.0.0-20190828143517-e35f2bf499b9 // indirect
 	github.com/mdlayher/wifi v0.0.0-20190303161829-b1436901ddee
+	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
 	github.com/prometheus/common v0.7.0
@@ -22,6 +23,7 @@ require (
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
 	golang.org/x/sys v0.0.0-20190902133755-9109b7679e13
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+	gopkg.in/yaml.v2 v2.2.2
 )
 
 go 1.13

go.sum

@@ -68,6 +68,7 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -130,6 +131,9 @@ golang.org/x/sys v0.0.0-20190902133755-9109b7679e13/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

https/README.md

@@ -0,0 +1,24 @@
+# HTTPS Package for Prometheus
+
+The `https` directory contains a Go package and a sample configuration file for running `node_exporter` with HTTPS instead of HTTP.
+When running a server with TLS use the flag `--web.config`
+
+e.g. `./node_exporter --web.config="web-config.yml"`
+If the config is kept within the https directory.
+
+The config file should be written in YAML format, and is reloaded on each connection to check for new certificates and/or authentication policy.
+
+##Sample Config:
+```
+tlsConfig :
+  # Certificate and key files for server to use to authenticate to client
+  tlsCertPath : <filename>
+  tlsKeyPath : <filename>
+
+  # Server policy for client authentication. Maps to ClientAuth Policies
+  # For more detail on clientAuth options: [ClientAuthType](https://golang.org/pkg/crypto/tls/#ClientAuthType)
+  [ clientAuth : <string> | default = "NoClientCert" ]
+
+  # CA certificate for client certificate authentication to the server
+  [ clientCAs : <filename> ]
+```

https/testdata/server.crt

@@ -0,0 +1,96 @@
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 1 (0x1)
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=US, O=Prometheus, OU=Prometheus Certificate Authority, CN=Prometheus TLS CA
+        Validity
+            Not Before: Apr  5 08:06:57 2019 GMT
+            Not After : Mar 26 08:06:57 2059 GMT
+        Subject: C=US, O=Prometheus, CN=prometheus.example.com
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+                RSA Public-Key: (2048 bit)
+                Modulus:
+                    00:bd:6c:b6:7f:d1:2f:be:e4:41:eb:5d:ff:50:78:
+                    03:2b:76:03:da:01:48:20:13:90:66:c9:ce:6e:06:
+                    e5:fa:2d:0d:c0:b0:46:28:44:10:a0:61:79:87:a2:
+                    98:4c:29:fa:f9:bb:0f:44:c7:90:5c:5c:55:60:cd:
+                    45:da:b8:e4:dd:28:72:c8:8b:a1:3e:4b:00:09:82:
+                    b0:2c:dc:d6:17:c9:02:f4:cd:26:c7:11:28:f3:77:
+                    b5:97:c2:76:c2:e0:07:d7:34:5b:e0:ed:1a:59:a5:
+                    b4:b7:16:09:3d:35:bd:d9:03:07:9d:7c:3b:f0:63:
+                    bd:5e:02:99:cf:32:e1:ac:4c:7a:3e:4c:b2:8e:98:
+                    68:07:4f:59:dc:0d:bf:cc:83:04:5c:d8:90:f0:73:
+                    da:2b:08:17:c4:36:a7:d8:94:3d:b6:c0:af:29:0a:
+                    d3:19:5f:eb:7d:cc:4d:05:56:11:0a:ee:b1:f3:d7:
+                    c9:5a:3c:8c:57:16:91:51:14:f8:20:4e:0f:29:9e:
+                    04:21:e6:f1:e4:e8:44:af:d7:25:92:08:64:fc:2c:
+                    1c:2e:4f:71:53:91:53:1d:e5:f9:7b:52:0f:21:da:
+                    5c:dd:19:68:96:ca:70:6a:f1:c4:0d:07:af:f8:65:
+                    13:92:e9:ef:65:b3:89:86:fd:c0:74:5c:a4:6b:49:
+                    62:c5
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Digital Signature, Key Encipherment
+            X509v3 Basic Constraints: 
+                CA:FALSE
+            X509v3 Extended Key Usage: 
+                TLS Web Server Authentication, TLS Web Client Authentication
+            X509v3 Subject Key Identifier: 
+                00:61:01:AD:25:44:8A:EF:E1:2C:EC:83:5A:3A:3B:EA:A0:BD:E1:45
+            X509v3 Authority Key Identifier: 
+                keyid:4D:02:BF:71:95:6A:AA:58:C5:9C:B8:83:67:5E:64:16:99:E1:2A:9E
+
+            Authority Information Access: 
+                CA Issuers - URI:http://example.com/ca/tls-ca.cer
+
+            X509v3 CRL Distribution Points: 
+
+                Full Name:
+                  URI:http://example.com/ca/tls-ca.crl
+
+            X509v3 Subject Alternative Name: 
+                IP Address:127.0.0.1, IP Address:127.0.0.0, DNS:localhost
+    Signature Algorithm: sha1WithRSAEncryption
+         77:97:e4:ef:db:10:8e:62:50:96:4a:6e:f5:a4:f9:1f:19:3b:
+         c8:a4:dd:b3:f6:11:41:1a:fb:e3:f8:dd:0e:64:e5:2b:00:b9:
+         e6:25:9f:2e:e1:d2:9a:cd:b6:f2:41:4d:27:dd:2c:9a:af:97:
+         79:e8:cf:61:fb:cf:be:25:c6:e1:19:a0:c8:90:44:a0:76:8a:
+         45:d4:37:22:e5:d4:80:b4:b3:0f:a8:33:08:24:ad:21:0b:b7:
+         98:46:93:90:8a:ae:77:0c:cb:b8:59:d3:3b:9b:fb:16:5a:22:
+         ca:c2:97:9d:78:1b:fc:23:fc:a0:42:54:40:de:88:4b:07:2b:
+         19:4e:0e:79:bf:c9:9f:01:a6:46:c5:55:fa:9f:c0:0d:8a:a6:
+         e1:47:16:a6:0e:be:23:c9:e9:58:d6:31:71:8c:80:9c:16:64:
+         f0:14:08:22:a1:23:7c:98:b9:62:d1:4a:ce:e3:5c:59:fb:41:
+         87:a5:3b:36:dd:3d:45:48:b0:b0:77:6f:de:58:2a:27:4d:56:
+         20:54:08:20:c8:6d:79:b5:b9:e6:3a:03:24:0f:6d:67:39:20:
+         78:10:2f:47:85:83:c1:4d:17:33:79:84:75:27:fa:47:67:59:
+         56:cc:33:7b:a5:77:aa:59:9a:98:30:10:1a:78:43:34:8f:ed:
+         c2:a1:a3:ea
+-----BEGIN CERTIFICATE-----
+MIIEPDCCAySgAwIBAgIBATANBgkqhkiG9w0BAQUFADBpMQswCQYDVQQGEwJVUzET
+MBEGA1UECgwKUHJvbWV0aGV1czEpMCcGA1UECwwgUHJvbWV0aGV1cyBDZXJ0aWZp
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+FzN5hHUn+kdnWVbMM3uld6pZmpgwEBp4QzSP7cKho+o=
+-----END CERTIFICATE-----

https/testdata/server.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC9bLZ/0S++5EHr
+Xf9QeAMrdgPaAUggE5Bmyc5uBuX6LQ3AsEYoRBCgYXmHophMKfr5uw9Ex5BcXFVg
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+mcOsCcPAk8cLYtVfZo2sP3g=
+-----END PRIVATE KEY-----

https/testdata/tls-ca-chain.pem

@@ -0,0 +1,173 @@
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 2 (0x2)
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=US, O=Prometheus, OU=Prometheus Certificate Authority, CN=Prometheus Root CA
+        Validity
+            Not Before: Apr  5 08:00:37 2019 GMT
+            Not After : Mar 26 08:00:37 2059 GMT
+        Subject: C=US, O=Prometheus, OU=Prometheus Certificate Authority, CN=Prometheus TLS CA
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+                RSA Public-Key: (2048 bit)
+                Modulus:
+                    00:aa:d2:34:6b:ed:f1:f4:01:08:e5:00:9f:75:c8:
+                    ba:fc:4b:72:c6:04:93:af:f1:f6:b5:ce:01:0d:c6:
+                    bd:d3:16:98:9d:e5:51:56:12:58:16:ee:18:6e:f0:
+                    68:a9:42:16:65:cf:e3:31:f5:90:79:9d:13:32:87:
+                    3b:1f:65:fd:84:88:a4:56:3d:26:54:69:05:27:5a:
+                    ea:89:02:e7:31:9b:7d:7f:76:93:54:70:bc:17:92:
+                    06:9f:9f:90:4a:8a:cf:82:a7:7b:7c:71:c4:fa:34:
+                    56:00:32:1a:85:c5:f8:e4:4a:63:43:37:9d:60:84:
+                    4d:78:6e:87:12:c4:2b:1f:93:a5:fe:cc:5e:f1:df:
+                    c1:97:ff:b7:3e:20:38:1d:71:15:11:ec:6c:7a:cc:
+                    0e:87:52:31:b1:b9:74:c3:07:1c:42:4b:1e:c1:17:
+                    bc:e4:13:b7:b0:20:2e:c4:07:93:bd:a8:11:f9:da:
+                    a7:d0:df:4a:48:be:9b:6d:65:c3:ae:58:56:c0:9f:
+                    17:c5:d8:32:b1:04:22:fb:5b:18:f6:20:10:50:ec:
+                    2d:10:4f:cc:48:8f:f2:75:dd:33:a4:0e:f5:55:da:
+                    2c:89:a1:3a:52:bb:11:11:0b:97:27:17:73:35:da:
+                    10:71:b3:9f:a8:42:91:e6:3a:66:00:f9:e5:11:8f:
+                    5b:57
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Certificate Sign, CRL Sign
+            X509v3 Basic Constraints: critical
+                CA:TRUE, pathlen:0
+            X509v3 Subject Key Identifier: 
+                4D:02:BF:71:95:6A:AA:58:C5:9C:B8:83:67:5E:64:16:99:E1:2A:9E
+            X509v3 Authority Key Identifier: 
+                keyid:3C:1E:A8:C6:4C:05:4D:20:EC:88:DB:29:D4:7B:F9:12:5D:CE:EA:1A
+
+            Authority Information Access: 
+                CA Issuers - URI:https://example.com/ca/root-ca.cer
+
+            X509v3 CRL Distribution Points: 
+
+                Full Name:
+                  URI:https://example.com/ca/root-ca.crl
+
+    Signature Algorithm: sha1WithRSAEncryption
+         63:fc:ba:30:a5:05:d6:76:14:f1:77:38:b1:41:6f:81:d9:b4:
+         02:fd:bc:e5:f6:d9:e6:73:e0:71:cf:4c:fb:13:b5:6b:bd:b9:
+         c6:f6:28:18:36:e1:8c:d9:93:b3:78:4a:3d:39:1b:f4:fb:69:
+         75:24:ae:e1:a0:2f:94:05:bf:10:3c:3e:d2:2b:a8:f3:31:25:
+         2e:ed:13:ad:60:5d:22:9a:26:15:20:86:98:73:4c:f6:4b:48:
+         b8:1f:67:ba:4e:c9:47:ed:85:dc:38:dc:02:0c:fb:54:d5:2e:
+         6c:b4:95:18:51:d1:ae:ea:e8:fb:b4:19:50:04:bc:31:7e:51:
+         9e:85:29:4d:c8:f7:26:d6:d6:8d:35:2d:9e:e2:06:16:38:e2:
+         56:80:ec:f3:a3:34:e3:28:c4:e8:10:d0:8a:a6:6f:20:9a:b9:
+         dc:b9:90:6b:ba:8a:27:2c:29:72:28:55:e7:59:a6:a7:90:ec:
+         32:e8:d0:26:4a:c1:44:dd:20:bf:dc:4d:1e:7e:cc:e5:a2:5b:
+         e8:df:3d:4b:01:aa:48:56:17:e9:29:d8:71:83:05:36:8c:11:
+         4f:77:b8:95:20:b7:c7:21:06:c2:87:97:b4:6b:d3:f7:23:ba:
+         4d:5f:15:d1:0c:4d:6e:f1:6a:9d:57:5c:02:6a:d7:31:18:ef:
+         5c:fc:f8:04
+-----BEGIN CERTIFICATE-----
+MIIELTCCAxWgAwIBAgIBAjANBgkqhkiG9w0BAQUFADBqMQswCQYDVQQGEwJVUzET
+MBEGA1UECgwKUHJvbWV0aGV1czEpMCcGA1UECwwgUHJvbWV0aGV1cyBDZXJ0aWZp
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+TW7xap1XXAJq1zEY71z8+AQ=
+-----END CERTIFICATE-----
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 1 (0x1)
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: C=US, O=Prometheus, OU=Prometheus Certificate Authority, CN=Prometheus Root CA
+        Validity
+            Not Before: Apr  5 07:55:00 2019 GMT
+            Not After : Mar 26 07:55:00 2059 GMT
+        Subject: C=US, O=Prometheus, OU=Prometheus Certificate Authority, CN=Prometheus Root CA
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+                RSA Public-Key: (2048 bit)
+                Modulus:
+                    00:bf:b9:e2:ab:5f:61:22:e1:4e:cd:ee:da:b0:26:
+                    2e:bb:b0:7e:1c:ce:10:be:16:29:35:0c:0c:1d:93:
+                    01:29:2a:f6:f9:c2:6e:5c:10:44:ca:f8:dc:ad:7a:
+                    06:64:0f:8a:18:ad:b2:a2:94:49:c9:ba:8c:45:94:
+                    7c:d9:e0:11:45:d8:16:79:a2:20:9f:8c:63:60:72:
+                    2a:5b:f9:66:80:ac:85:67:01:5a:eb:91:c1:d2:88:
+                    87:9e:4c:18:c9:f2:f0:7a:18:c0:e6:ab:2c:78:de:
+                    5f:b2:22:4e:94:9c:f5:cd:e6:e2:33:30:e9:20:10:
+                    a6:a1:75:eb:59:ab:45:a9:f7:3e:54:40:ae:05:25:
+                    be:74:c5:3a:fd:af:73:16:60:45:7c:4a:e0:0e:0d:
+                    a1:15:7f:9a:1f:c2:a7:04:ad:ef:b3:e4:f6:00:2c:
+                    4e:0b:04:90:49:ee:d3:db:a6:12:c4:91:0b:32:4f:
+                    11:84:c7:c4:8a:ef:51:66:7a:b0:20:2f:cb:95:8d:
+                    96:57:60:66:5e:f9:4f:5a:94:9c:71:ad:eb:ca:70:
+                    3e:62:06:c2:3a:29:f8:9e:86:af:da:07:78:f8:31:
+                    af:42:48:49:9e:4a:df:1b:27:1f:44:35:81:6d:fa:
+                    7a:c5:6a:0a:35:23:c7:c4:d5:fe:c9:9e:61:c9:30:
+                    cd:1f
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Certificate Sign, CRL Sign
+            X509v3 Basic Constraints: critical
+                CA:TRUE
+            X509v3 Subject Key Identifier: 
+                3C:1E:A8:C6:4C:05:4D:20:EC:88:DB:29:D4:7B:F9:12:5D:CE:EA:1A
+            X509v3 Authority Key Identifier: 
+                keyid:3C:1E:A8:C6:4C:05:4D:20:EC:88:DB:29:D4:7B:F9:12:5D:CE:EA:1A
+
+    Signature Algorithm: sha1WithRSAEncryption
+         56:2f:79:e5:12:91:f5:19:a7:d1:32:28:fd:e3:9d:8f:e1:3c:
+         bb:a3:a5:f2:55:8a:03:ad:2c:1d:18:82:e1:7f:19:75:d9:47:
+         5b:e7:7c:e4:a5:e0:eb:dc:7e:24:a3:7d:99:1a:cf:39:ba:a5:
+         b4:b8:45:68:83:cf:70:ad:56:f2:34:73:65:fc:6c:b0:53:9a:
+         79:04:f7:3e:7e:4b:22:1b:e7:76:23:20:bc:9c:05:a2:5d:01:
+         d2:f0:09:49:17:b2:61:74:1a:5b:f4:e0:fd:ce:11:ba:13:4a:
+         e6:07:11:7d:30:e2:11:87:ee:33:1a:68:de:67:f4:ac:b5:58:
+         1a:ac:cf:7a:2d:fd:c3:44:5b:4b:cd:6c:ff:f6:49:b4:55:4a:
+         09:a0:92:2d:57:3b:69:85:54:3e:e9:ec:ef:b2:a5:7a:29:75:
+         2b:f8:eb:4b:d4:cf:68:ee:3e:c8:63:7e:12:eb:e4:2f:63:a3:
+         a7:c8:0f:e9:39:ff:5c:29:65:7f:25:f0:42:bf:07:ba:06:b8:
+         5e:d6:56:ba:f8:67:56:1b:42:aa:b3:04:d8:6e:88:10:a5:70:
+         b5:81:04:a4:90:a3:f0:83:4d:0c:6b:12:5d:a4:4c:83:5a:ff:
+         a8:7a:86:61:ff:0f:4c:e5:0f:17:d1:64:3c:bd:d9:22:7e:b7:
+         fa:9b:83:ba
+-----BEGIN CERTIFICATE-----
+MIIDtDCCApygAwIBAgIBATANBgkqhkiG9w0BAQUFADBqMQswCQYDVQQGEwJVUzET
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+3mf0rLVYGqzPei39w0RbS81s//ZJtFVKCaCSLVc7aYVUPuns77Kleil1K/jrS9TP
+aO4+yGN+EuvkL2Ojp8gP6Tn/XCllfyXwQr8Huga4XtZWuvhnVhtCqrME2G6IEKVw
+tYEEpJCj8INNDGsSXaRMg1r/qHqGYf8PTOUPF9FkPL3ZIn63+puDug==
+-----END CERTIFICATE-----

https/testdata/tls_config_auth_clientCAs_invalid.bad.yml

@@ -0,0 +1,4 @@
+tlsConfig :
+  tlsCertPath : "testdata/server.crt"
+  tlsKeyPath : "testdata/server.key"
+  clientCAs : "somefile"